vibrating feeder

vibrating feeder

Vibratory feeders are used in gravimetric feeding systems to handle solids with particles that are loo large to be handled by screw, rotary-vane, or vertical-gate feeders, or in operations where the physical characteristics of the solid particles would be adversely affected by passage through these volumetric feeding devices. The discharge flow pattern of a vibrating feeder is extremely smooth and thus is ideal for continuous weighing in solids flow metering applications.

The vibratory feeder consists of a feed chute (which may be an open pan or closed tube) that is moved back and forth by the oscillating armature of an electromagnetic driver. The flow rate of the solids can be controlled by adjusting the current input into the electromagnetic driver of the feeder.

The vibratory feed chute can be jacketed for heating or cooling, and the tubular chutes can be made dust-tight by flexible connections at both ends. The vibratory feeders can resist flooding (liquid-like flow) and are available for capacity ranges from ounces to tons per hour.

The Electric Vibratory Feeder is a vibratorthat provides an extremely efficient, simple and economical solution to the problem of making the most stubborn material flow freely. No longer need there be a sticking together of wet ore in the ore bin, or the arching over and hanging up of materials in hoppers and chutes with resulting lowered operating efficiency.

The powerful vibration of the simple, electro-magnetic vibrator is controlled by a separate, wall-mounted Controller, which is furnished with each vibrator. The dial rheostat in the controller varies the power of vibration. By merely turning the manual dial rheostat the power of vibration can be turned down to provide the most effective vibration required for the purpose. The controller is in a separate, dust-proof housing, arranged for wall-mounting at any desirable distance away from the vibrating mechanism attached to the bin, hopper, or chute.

These vibrators are furnished in many different sizes. Units are available that range from those equipped to handle large tonnages in ore bins down to the small noiseless model best suited to be attached to a dry reagent feeder. Reagent feeder applications are numerous, but a well-known use is where the vibrator is utilized to keep moist lime or soda-ash stirred up and flowing evenly.

In an ore bin with a flat bottom and a center discharge, the material, especially when wet, will build up in the corners and form a dead storage space just inside the walls of the bin. One or two vibrators mounted on the outside of the ore bin (opposite to each other, when two are used), will eliminate the work that otherwise frequently has to be done by hand with a pick and shovel. Another, and possibly more important aspect, is that maximum treatment efficiency is assured by an even feed to crushers or ball mills.

These vibrators are also available at extra cost with totally-enclosed explosion-proof, or water and dust-proof cases. Also, for special jobs where danger of explosion or fire exists, a water or air-pressure vibrator can be furnished. A major advantage of these hydraulic vibrators over electricvibrators is that they can be made to run at a slow speed as well as at a high speed (2400 to 4800 vibrations per minute).

The flow velocity depends on the method for loading the feederis it fed through a hopper? The velocity is also dependent on the material characteristics, size distribution and moisture content, as well as the slope of the feeder. The only way to determine the value for v is by actual observation and then the feeding rate may vary considerably.

Feeders are used to provide and control the flow of bulk solids to the process from storage units, such as bins, bunkers, silos, and hoppers. In to-days fully instrumented process plants, it is mandatory that feeders maintain a uniform flow of material at the rate set by signals from process equipment farther downstream in the flow. Large variations in feed, due to feeder blocking, arching or ratholing in the bin, may completely defeat the purpose of such a sophisticated control system with all its planned advantages to the process.

Most of the bins used in the mining and metallurgical industry to-day are of the plug flow type, as they are suited for the storage of hard, abrasive or coarse materials. Exceptions are the ore concentrate or fine powder bins which usually are of the mass flow type.

Plug flow occurs in bins or hoppers with flat sloping walls and is characterized by the flow of solids in a vertical channel extending upward from the bin outlet. Plug-flow bins are suited for solids which are free flowing, do not deteriorate with time and in which segregation is of no importance. As flow does not occur at the bin walls, this type of bin is useful for the storage of hard and abrasive materials. The drawbacks of this type of flow, however, are as follows:-

a) The live bin capacity of the bin is drastically reduced. b) The bin is not self-cleaning and usually cannot be emptied by gravity flow. c) Materials which deteriorate with time cannot be stored in this type of bin. d) The flow is erratic and non-uniform, as solids flowing through a vertical channel with a constant cross section tend to form arches which collapse and compact the material below, thus causing arching again. e) This type of flow pattern in the bin aggravates the segregation of particle sizes.

In many instances, hopper openings are large enough to prevent arching: however if the hopper is not designed for mass flow, piping or ratholing may occur. In plug flow bins, the material flows in the centre of the bin, into which the sides slough as the material is drawn from the bin. Reaching a certain level in the bin where the material has time to consolidate, sloughing will cease and a steady channel or rathole (limited flow) will form, drastically reducing the bins live capacity. In mass flow bins, channelling can also occur if the feeder does not draw the material uniformly across the whole area of the feed opening.

To overcome flow problems, flow-promoting devices such as external vibrators, pneumatic air panels, air jets and vibrating internal structures are usually installed. These relatively inexpensive devices can solve the problem in marginal cases. However, where the costly complete re-design of bins or hoppers is indicated by bulk solids flow calculations, other apparently less costly ways for improvement are usually sought.

The extension of the mine workings under adjacent lakes for the reach of the recently found copper ore body, and the introduction of sand fill underground in the past years using the mill tailings, led to build-up of the moisture content of the fine ore. In the meantime, the 50% increase of daily mill output from the original 2000 to 3000 tons necessitated finer fourth stage crushing and the addition of an extra grinding mill. The fine ore actual handled to-day is a roll-crusher product of -5/32 in size with a moisture content of 2% to 3%.

The fine ore bin, as originally conceived with its wear angles on the sloped walls, is of the plug-flow type. It performed satisfactorily in the earlier stages of operation of the plant when the material handled was coarser and lower in moisture content. With increasing ore moisture and material fineness, however, the live capacity of the fine ore bin was gradually reduced to a point where, in some instances, only channelling or ratholing occurred over the feed openings.

After visiting installations using long belt feeders, consideration was given to the use of the existing gathering conveyors as belt feeders. This scheme involved the cutting of long slots into the bin bottom above the entire length of the existing belts.

The flow pattern in a flat bottom bin with single or multiple openings is usually of the plug-flow type. The drawbacks of this type of flow have been explained previously. It was felt, however, by the author that improvements could be made by the appropriate location of feed openings and by the use of suitable feeders. The basic idea for this improvement was initiated by the review of the results of model tests performed on flat bottom bins, which indicate a mass flow type of pattern at the beginning of the bin discharge. This pattern switches gradually to plug flow as the material level drops below a certain point. This partial mass flow situation can prevail only if the material handled is reasonably free-flowing, the feed openings are sufficiently closely spaced, and the material is drawn uniformly from each opening.

The example illustrated is taken from an iron ore concentrator, and shows the arrangement in which the mill feed conveyor is receiving material from the gathering belt located underneath the two silos. The fine ore handled is taconite, -5/8 in size, and a tertiary cone crusher product with 1 to 2% moisture.

When drawn empty, the dead material left in the bin generally takes the form of a wedge-shaped hopper. However, the slope of the material should not be mistaken for the angle of repose , as it is really the included half angle e of the flow channel, which is usually much steeper due to material consolidation. Approximate expected values of e can be calculated knowing the flow properties of the material handled.

5 tips for creating the perfect vibratory feeder system | vibratory & rotary feeder insights | hoosier feeder company

5 tips for creating the perfect vibratory feeder system | vibratory & rotary feeder insights | hoosier feeder company

Vibratory feeder systems are a very common for feeding components in manufacturing and assembly. A typical feed system contains a bowl feeder, linear feeder and controls package. The vibratory drive unit delivers the parts to the tooling features of the bowl which orients and selects parts to the proper orientation. Parts are then delivered down a linear feeder to the assembly process.

Related Topics: Bowl Feeders, Centrifugal Feeders, Feeder Systems, Linear Feeders, Modular Centrifugal Feeder, Parts Feeders, Parts Handling Systems, Puck Feeder System, Rotary Feeders, Vibratory Feeders, Feeder System Design, Feeder Cycle Speed, Part Orientation

Hoosier Feeder Company is a leader in the production of custom centrifugal feeders and vibratory bowl feeder systems. Our innovative parts handling solutions are serving our clients across the U.S., Canada, and Mexico.

all about vibrating conveyors - types, design, and uses

all about vibrating conveyors - types, design, and uses

Material handling equipment allows manufacturers to move materials from one location to the next and completes this task in many unique ways. Conveyor technology has been developed to move all kinds of product, whether it be solid, semi-solid, or even liquid, and many conveying systems are available to address each of these needs. Our article on understanding conveyor systems does a great job of showing these different conveyor types, but in this article, we will focus in on vibrating conveyors and their types, designs, and uses. By doing so, this article aims to help those interested in conveyors to decide if the vibrating conveyor fits their needs, and/or let buyers know their available options.

Vibrating conveyors, well, vibrate. Its an arbitrary statement, but it highlights the core functionality of this conveyor type: use vibrational energy to impart static and dynamic forces on aggregate materials and cause them to move up or down a pathway. The conveying surface is typically a smooth trough with vibratory components attached to cause this trough to shake lengthwise. This action allows bulk product such as coal, limestone, food materials, sand, gravel, and more to hop with the frequency of the vibration towards one end of the trough. When this hopping action happens at many cycles a second, it causes the bed of materials to convey, and it can even drive deep beds of bulk such as the woodchips shown in Figure 1. Vibrating conveyors are specified when horizontal or shallow incline conveying is needed and can handle most bulk, from powders to solids to irregularly shaped materials.

The function of vibrating conveyors is highly dependent upon its motor and its construction; as a result, it will be hard to generalize the working principles of all vibrating conveyors. Figure 2 gives a common iteration of vibrating conveyor designs, where a drive system imparts an oscillatory force onto the trough with a specific frequency and amplitude. The trough stroke, or one full movement of the trough, is usually twice the amplitude of the vibration and the goal for most vibrating conveyors is to minimize this amplitude but maximize frequency. These vibrating conveyors are often called controlled conveyors, as the frequency and amplitude can be exactly set and changed if need be. Natural frequency vibrating conveyors utilize springs and other components that cause the trough to vibrate at their inherent frequencies, which reduces energy usage and uniformly distributes vibration across the trough. Most vibrating conveyors implement some natural frequency techniques, but controlled conveyors are often specialized, but again it is difficult to generalize. There is an intensive mathematical analysis performed in creating a suitable conveyor, as each material (and even different batches of the same material) react differently to the chosen amplitude and frequency of the conveyor.

There are three main drive mechanisms used in vibrating conveyors: cranks/springs, rotating weights, and electromagnets. Crank or spring-type conveyors are what is visualized in Figure 1, where a four-bar mechanism is rotated by a motor, imparting an elastic force that causes sinusoidal motion. Rotating weights and electromagnets accomplish the same end goal but do so by using rotating eccentric weights and rotating magnetic fields, respectively. The advantages of any one drive system over another is highly variable, as all have been shown to be effective and they depend heavily on the parameters of the application and the working environment.

The vibrating conveyor is used extensively where sanitation and low maintenance are paramount; they find applications in food and chemical, rubber, foundry, processing, and more industries. They can readily work under harsh conditions where dirt, heat, and corrosive materials are present. While being resilient, they can convey fragile materials such as potato chips without crushing them and are self-cleaning by nature. They are minimally hazardous by themselves and are simple in construction. Vibrating conveyors are only limited by what they can convey, as well as their horizontal and vertical limits.

It is challenging to classify vibrating conveyors; they are most often categorized based on ultimate application or duty type, and so there are not exact subclassifications of this conveyor. It is further confounded by manufacturers, who designate their vibrating conveyors to their specific applications or designs. This article will aim to illustrate the most basic types of vibrating conveyors, to show the reader their available options for purchase, if intended.

Standard duty vibrating conveyors are built for medium to light density material, such as plastics, wood, porous rock, and the like. They are often rated with capacities ranging from 1-40 tons per hour at speeds up to 60 feet per minute and can be both modular and portable, depending upon needs. These conveyors typically have a long lifetime and experience little to no wear, which makes them a reliable and safe option for moving aggregate. They find uses in food and chemical processing, manufacturing, plastics, and many more applications.

Heavy-duty vibrating conveyors are rated to move heavier, more unwieldy materials that require high power and speed, and are typically used for rock, metal, and large volumes of heavy products. They have capacities exceeding 500 tons per hour with speeds up to 90 feet per minute and are typically installed units that require specific foundation supports such as dampers, dashpots, stands, and more. Heavy-duty conveyors are often controlled via motors and require increased power requirements than standard duty vibrating conveyors. They find uses in foundries, large manufacturing, lumber, rubber, and other largescale applications.

While not dissimilar from the functionality of other types of vibrating conveyors, the vibratory feeder is distinguished based on its function, namely, to uniformly feed materials into another device. These feeders are most useful for continuous weighing applications where certain volume rates are needed and where other feeder types cannot be used. Besides the model above in Figure 5, vibratory feeders are also used in a bowl arrangement to convey oddly shaped small parts such as screws, rings, and more in an orderly fashion. They find applications in the chemical, food, hardware, and manufacturing industries in various roles.

Among different manufacturers, the term oscillating conveyor will sometimes appear. Oscillating conveyors are sometimes described as being a specific type of vibrating conveyor wherein they operate using a relatively low frequency and a larger amplitude of motion than would typically be employed with a vibrating conveyer6. As a result, oscillating conveyors are used to bulk materials such as in the timber industry or waste management/recycling industry. For example, these conveyors may be used to transport wooden scraps from an upstream system and send these to a discharge point. When contrasted with vibrating conveyors that operate at lower amplitudes and higher frequencies, the motion or movement of the material is gentler with a vibrating conveyor than with an oscillating conveyor. In quarrying applications, oscillating conveyors are sometimes referred to as jump conveyors and are called grasshopper conveyors in hard rock mining applications7.

Be aware, however, that there are other suppliers and manufacturers of conveyors that do not make a specific distinction between the terms oscillating conveyors and vibrating conveyors using these terms synonymously. So it would appear that there is no uniform agreement as to how these two terms are defined and differ from one another (see sources 3, 8, and 9 below).

As previously explained, vibrating material handling equipment encompasses many machines and applications. This poses an issue when specifying one for use, as the available options and variations can be daunting. This article will provide some useful specifications that can be brought to most suppliers that will help determine a good vibrating conveyor choice.

Understand what the conveyor will move, how much of it must be moved, and at what speed to specify the desired load capacity and pieces per minute. These values will give your supplier a good idea of the general size, shape, and duty rating of the right conveyor. If you are unsure of these values, your supplier can help determine the right capacity and speed for your given application.

Determine the span that the aggregate must traverse, how wide it should be, and how much vibration it will take to move the material. For example, if boulders are being conveyed a long distance, it will naturally require a wider trough and a larger drive. These ideas will further inform what kind of vibrating conveyor will be best suited and can determine the right drive and power requirements needed for your project.

These conveyors are typically low maintenance and passive, but control can be added if these conveyors will be a part of a larger control system. If control is not needed, there are many passive options that are proven to be effective. Also, determine any special requirements such as hazard protection, containment/sterile components, and/or foundational damping. These considerations, along with any others that are important, should be given to your supplier to help them help you find the best options.

This article presented an understanding of what vibrating conveyors are and how they work. For more information on related products, consult ourother guidesor visit theThomas Supplier Discovery Platformto locate potential sources of supply or view details on specific products.

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eriez - vibratory feeders and conveyors

eriez - vibratory feeders and conveyors

With their totally enclosed patented magnetic drive, Light and Medium Duty Feeders are perfect for feeding practically any bulk materialfrom micron size to bulk chunks. They feature solid state controls, which operate the state-of-the-art feeders with watch like precision. Custom designs are available and may include multiple drives, enclosed trays or screens. Additionally, a wide variety of standard and special trays are available.

With their totally enclosed patented magnetic drive, Light and Medium Duty Feeders are perfect for feeding practically any bulk materialfrom micron size to bulk chunks. They feature solid state controls, which operate the state-of-the-art feeders with watch like precision. Custom designs are available and may include multiple drives, enclosed trays or screens. Additionally, a wide variety of standard and special trays are available.

Our Heavy Duty Electromagnetic Vibratory Feeders are ideal for handling coal, ore, aggregates, slagor any other situation where high volume, controlled feeding is required. With their energy-saving intermeshed AC/permanent magnet drive, these powerful units are the workhorses in Eriez' huge stable of Vibratory Feeders and Conveyors. They are available in nine models with capacities to 850 tons (765 MT) per hour*. (*Capacity is based on sand weighing 100 pounds per cubic ft. (1.6 metric tons per cubic meter)

Our Heavy Duty Electromagnetic Vibratory Feeders are ideal for handling coal, ore, aggregates, slagor any other situation where high volume, controlled feeding is required. With their energy-saving intermeshed AC/permanent magnet drive, these powerful units are the workhorses in Eriez' huge stable of Vibratory Feeders and Conveyors. They are available in nine models with capacities to 850 tons (765 MT) per hour*. (*Capacity is based on sand weighing 100 pounds per cubic ft. (1.6 metric tons per cubic meter)

Simple and rugged Mechanical Conveyors from Eriez provide controlled movement of large volumes of bulk materials. They are available in single and two-mass vibrating systems which are excited by a motor-driven eccentric shaft. These vibrating machines feature a compact, straight line design that presents a low profile, yet enables easy maintenance. Minimum headroom is required.

Simple and rugged Mechanical Conveyors from Eriez provide controlled movement of large volumes of bulk materials. They are available in single and two-mass vibrating systems which are excited by a motor-driven eccentric shaft. These vibrating machines feature a compact, straight line design that presents a low profile, yet enables easy maintenance. Minimum headroom is required.

High capacity Vibratory Screeners are designed for liquid/solid separation and wet or dry classification. These easy-to-operate gyratory units allow trouble-free and quick tuning to specific feed rates, product and separation requirements. Benefits are many, including long screen life and no damping under loads. Inline screeners are also available.

High capacity Vibratory Screeners are designed for liquid/solid separation and wet or dry classification. These easy-to-operate gyratory units allow trouble-free and quick tuning to specific feed rates, product and separation requirements. Benefits are many, including long screen life and no damping under loads. Inline screeners are also available.

Eriez Bin Vibrators are used in applications ranging from the tiniest hopper to huge bunkers, providing efficient and economical movement of hard-to-handle bulk materials. Electric Rotary Vibrators (ERVs) serve as a powerful, reliable and effective flow-aid for hoppers and chutes, or a driving force for vibratory screeners, feeders and conveyors.

Eriez Bin Vibrators are used in applications ranging from the tiniest hopper to huge bunkers, providing efficient and economical movement of hard-to-handle bulk materials. Electric Rotary Vibrators (ERVs) serve as a powerful, reliable and effective flow-aid for hoppers and chutes, or a driving force for vibratory screeners, feeders and conveyors.

vibrating feeder design - stockpile & reclaim | general kinematics

vibrating feeder design - stockpile & reclaim | general kinematics

The expanding applications of vibratory feeders for controlling the flow of bulk materials, and their adaptation for processing requirements, have developed a considerable interest in stockpiling and reclaim systems. The general design of these units consists of a material transporting trough (or platform) driven by a vibratory force system. The flexibility and variety of designs are limited only by the ingenuity of design engineers. The basic motion of the vibratory trough, or work member, is a controlled directional linear vibration which produces a tossing or hopping action of the material. Material travel speeds vary from 0 to approximately 100 ft. per minute, depending on the combination of frequency, amplitude, and slope vibration angle.

The installation of vibrating feeders in over 300 power plants has proven the reliability and economical construction for these feeder units. System designers must apply improved designs for controlling the flow of coal or other bulk materials from storage including full consideration for dust control and pollution. Automated coal handling systems should include manpower and equipment maintenance requirements in the evaluation of any layout. Overall operating costs in a material handling system are passed on to the consumer in the price of energy. Minimizing the use of dozers and mobile equipment reduces the fugitive dust problems and improves the reliability of the system. The efficient and economical storage, movement, and control of large tonnage material handling installations unit train loading and unloading, storage, blending, and reclaim systems depend on the proper application and design of vibrating feeders.

Vibratory feeders are basically applied to a control function to meter or control the flow of material from a hopper, bin, or stockpile, much the sameas an orifice or valve control flow in a hydraulic system. In a similar sense, feeders can be utilized as fixed rate, such as an orifice, or adjustable rate, as a valve. Feeders are supported by a structure or hung from hoppers by cables with soft springs to isolate the vibration of the deck from the supporting structure. Capacities range from a few pounds to 5000 tons per hour or more.

Vibratory feeders are basically applied to a control function to meter or control the flow of material from a hopper, bin, or stockpile, much the same as an orifice or valve control flow in a hydraulic system. In a similar sense, feeders can be utilized as fixed rate, such as an orifice, or adjustable rate, as a valve. Feeders are supported by astructure or hung from hoppers by cables with soft springs to isolate the vibration of the deck from the supporting structure. Capacities range from a few pounds to 5,000 tons per hour or more.

Some of the principal advantages of vibratory feeders over other types of bulk feeding devices are the opportunity for utilizing full sized hopper openings to reduce bridging and assure the free flow of material. This free flow comes via vibrating material in the hopper throat and eliminating the requirement for bin vibrators. In most cases, the vibratory feeder pan eliminates the requirements for rack and pinion gates and other shut-off devices above feeders since the feeder pan functions as a shut-off plate. The design of the unit permits replacement of the drive mechanism without removing the feeder trough. There is a reduction in headroom requirements and considerable savings in pit or tunnel construction and elimination of gates. Eliminating gates also promotes the free unobstructed flow of material. In process requirements, the ability to vary the feed control from absolute zero to maximum in response to instrumentation signals meets the design requirements for automated blending and reclaim systems. No return run such as belt feeders eliminates scrapers and spillage. They can be designed for dust-tight applications.

1. Direct-force type in which 100 percent of the vibratory forces are produced by heavy centrifugal counterweights.The forces developed are transmitted directly to the deck through heavy-duty bearings. Linear motion can be generated by the use of counter-rotating shafts with timing gears operating in an oil-bath housing and driven through a V-belt. Other designs utilize two synchronizing motors, with counterweights mounted on the motor shaft.In general, the direct-force type is applied as a constant-rate feeder. The feed rate can be adjusted by changing the slope of the pan, size of the hopper opening, or changing the amount of counterweight, and stroke. In some cases, mechanical or electrical variable-speed drives are applied to vary the frequency and feed rate, but the regulation and control range is limited.The stroke and capacity are affected by the hopper opening and the amount of material on the feeder pan.

2. Indirect-force types, better known as resonant or natural frequency units, generate the vibratory forces from a relatively small exciting force which is amplified through the application of a secondary spring-mass system.In most designs, natural frequency feeders are tuned at a mechanical natural frequency above the operating frequency of the drive in order to prevent excess dampening effect of the material head load, particularly in larger units with large hopper openings or high capabilities. The term sub resonant is used to describe these units.

The resonant or natural frequency vibratory feeder is designed to control the flow of bulk materials using the amplification principle of a two-mass spring system with a constant exciting force.The prime mover is a standard squirrel cage ac motor. Small eccentric counterweights mounted on the double-extended shaft of the squirrel-cage motor in the exciter assembly produce a constant rotating exciting force.This drive design completely eliminates the requirements for heavy bearings, V-belt drives, guards, electric plugging circuits, pressure switches, gears and lubrication problems. Other designs use an unbalanced eccentric shaft driven by belts from a separately supported motor designed for vibratory service.The component of the rotating exciting force, in line with the desired feeder stroke, is amplified by coil or polymer springs to produce a powerful straight line conveying action on the deck. The squirrel-cage motor speed varies less than 1-1/2% with +/- 10 percent fluctuation. The constant rotating exciting force results in accurate feed control regardless of normal voltage fluctuations.

The total spring system of the vibratory feeder is designed so that the amplitude-frequency response of the two-mass system is such that the greater the material effect, the greater the amplification of the spring-weight system. This results in an automatic increase of the amplified exciter force which naturally compensates for material head load and weight effect. This anti-dampening characteristic results in accurate volumetric feed-rate control regardless of material head load variations.

Electromagnetic feeders have been used extensively. These units are designed as Two-Mass spring systems in which the pan or deck is mounted on a bank of leaf springs which is rigidly attached to a relatively larger impulse mass. Alternating or pulsating direct current creates an exciting magnetic force between an armature and the field coils which are usually mounted on the impulse mass. Variable amplitude is obtained through a rheostat and rectifying equipment or variable-voltage transformers.Electromagnetic units are usually sensitive to material head loads and voltage fluctuations. In some applications electronic circuits and voltage-regulation equipment are employed.

Maximum feed rate can be fixed or set by adjusting the small eccentric weights located on the motor or vibrating shaft. Stroke can also be adjusted by the use of tuning springs to vary the resonance effect. Some designs attempt to control the feed rate by varying the RPM of a squirrel cage motor with SCR controls or variable voltage transformers. This method of adjusting the control is satisfactory for relatively limited ranges. Vibrating feeders, like those at General Kinematics, are suspended on coil springs to isolate the motion from the supporting structure. The natural frequency of the suspension system is generally 50% of the operating speed of the feeder motor. Reducing the RPM of the feeder motor approaches the natural frequency of the suspension system so that at some point the feeding becomes erratic or causes problems in the suspension system. Other designs may have internal drive constructions which also respond in an erratic fashion to variable speed drives. For applications requiring maximum adjustable control of feed rate, an infinitely variable, stepless feed rate is obtained by the use of a Variable Force counterweight wheel on each of the extended motor shafts.

This vibrating feeder design provides linear control from zero to maximum feed rate. Variable Force counterweight control alters the exciting force by varying only the counterweight effect rather than the motor speed. As air or hydraulic pressure signal varies from zero to maximum, the unbalanced forces vary proportionally. Motor speed remains constant. Since the NEMA design squirrel cage motor operates with full torque at all times, it can stop and resume feed at any capacity, even 5000 TPH. The control responds accurately and smoothly to any manual, pneumatic, hydraulic or electronic input signal-load cell, belt scale, computer for fully automated operation.

Material characteristics and size distribution generally dictate the hopper or bin slopes as well as the hopper opening. In determining the size of hopper opening it is important to consider the largest size particles as well as the bridging effect of the material. The projected vertical opening should be two or three times the largest size pieces. Materials with high bridging characteristics require adequate openings to assure flowability. Larger openings save headroom but require feeders with the ability to operate under headloads. Another feature of large hopper openings is the transmission of feeder-pan vibration directly to the material to reduce bridging, eliminating the requirement for bin vibrators, and promoting smooth uniform flow of materials. These design factors require feeders that are able to operate under a material head-load with minimum damping or muffling effect. Para-Mount II Feeders are ideal as they are tuned to increase vibratory forces to compensate for the material mass effect.

The projected horizontal opening is determined by the particle size and capacity requirements. The minimum opening should be approximately 1-1/2 times the largest lump size.The maximum size opening is determined by the volumetric capacity consistent with feeder length. It is desirable to include a slide plate or gate to permit field adjustment.

The projected horizontal area is a function of the projected horizontal opening and feeder-pan width. The average material velocity will vary with material flow characteristics, the coefficient of friction, feeder pan slope, length, and vibration intensity.

Material velocities will range from 30 to 60 fpm with pan slopes from 0 to 20 deg. Feeder-pan trough length is determined by the material angle of repose and pan slope. The feeder pan must be of sufficient length to assure complete material shutoff when the feeder is at rest. A line drawn from the maximum opening at the material angle of repose should intersect the pan trough, leaving a margin of cutoff length to allow for variations in material characteristics.

Selection capacities shown in the table are guides for selecting the feeder size. Feed rates may vary widely with material characteristics such as density, particle size distribution, moisture content and angle of repose. Maximum feed rates are obtained by declining feeder pan consistent with hopper opening and feeder length. Minimum length of feeder may be determined by hopper opening, feeder slope and angle of repose. Select feeder with adequate length to prevent flushing. Hopper opening required to minimize hopper bridging effect may determine width and length of the feeder. In some cases, headroom or minimum tunnel depth consideration justify a size selection larger than required for volumetric flow.

Feeder troughs can be ruggedly built for heavy-duty service. Frames are heavily reinforced. Deck plates are bolted to husky channel side members and are readily replaceable. Decks are available in mild steel, abrasion-resistant steel, stainless steel or special alloys, thus providing a wide range of materials to suit application requirements. Thicknesses from 10 ga. to 1 widths from 18 to 144. Liners are also available in the above materials, as well as rubber, plastics or ceramics. Dust-tight covers can be furnished where required.

As you think about the design of your vibrating feeder, the lining materials should be selected with consideration to the material being handled as well as the economic factors. For extremely abrasive materials, ceramic liners in the form of high-density aluminum oxide tiles can be installed on a flat deck with epoxy resins with a high degree of success. This has been very successful in applications involving coke, for example in the steel mills. Another type of material is a UHMW Polymer (ultra-high molecular weight) polyethylene plastic, used as a liner for abrasive, wet fine, material. This in many cases prevents the buildup encountered with metal decks.

A very common material as a liner is Type 304 stainless steel. This is particularly adaptable to materials which have a corrosive effect as well as wear. The stainless steel material is excellent for this application as the general action of the material on the feeder is a sliding action, which polishes the stainless to a very smooth finish preventing buildup and also resulting in longer life. Experience has shown that feeders in power plants have been operating for over 15 years with no appreciable wear on the 304 stainless steel material. Many alloy decks such as T-1 and Jalloy can also be used for abrasive service.

The conventional feeders that have been available consist of a flat pan trough with relatively low sides. This requires that stationary skirts be installed between the hopper or storage opening and the inside of the feeder trough to contain the material being conveyed by the vibrating feeder pan. Also, there has been a difficult design problem to provide dust or mud seals between the stationary skirts and the vibrating feeder pan. Another problem has been to provide a satisfactory seal between the feeder pan and any dust housing over the conveyor belt or receiving chute. A newer vibrating feeder design incorporates the side skirts as part of the feeder forming a totally-enclosed design. The feeder is shaped like a box structure with a flanged inlet and bottom flanged outlet cooperating with the inlet-chute and receiving chute or hopper. In this case, the seals are never in contact with the material and are much simpler to install and maintain. The feeding unit can now be made completely dust-tight (or watertight) and eliminates any spillage encountered with conventional feeders. Installation is simplified. This design also eliminates the problem encountered in trapping material between stationary skirts and the vibrating pan, which may cause reduced capacity or complete locking of the pan to the stationary skirts in the case of material that has a tendency to cake or cement when inactive.

Some installations use a combination of a vibrating bin bottom or pile activator with a vibrating feeder to control flow.The UN-COALER combines the flow control characteristics of a totally enclosed vibrating feeder with the material activating action of a vibrating bin bottom to assure maximum material drawdown without the attendant problems of flushing or compacting. Until now, it has been necessary to select a circular bin activator sized to provide maximum material flow and the use a vibrating feeder to control the flow and prevent flushing. A single unit can do the job effectively and economically.

The construction consists of a square or rectangular box structure with two symmetrical feeder pans in combination with a center dome.The geometry of the material flow path is similar to the requirements for open pan feeders. The center dome is part of the box structure and functions as a pile activator or vibrating hopper bottom.

The entire assembly is vibrated horizontally by the natural frequency drive mechanism identical in design to a coil spring feeder drive. The bottom slot opening feeds the material to the belt to deposit the coal symmetrically and centrally to develop an ideal belt loading.The center dome produces a vibratory action on the material to reduce the arching and induce the flow in the storage pile.Sealing is simple and complete with installation of seals as shown in the diagrams.

When applied to any type of bulk material storage unit, the UN-COALER activator / feeder will increase the amount of reclaimable live storage. It is especially advantageous when used with sluggish, hard to handle ores, lignite coal, and other materials with high particle friction or a poor natural angle of repose. Units are available up to 12 x 12 or larger openings, depending on your application.Large openings mean fewer units are required to achieve the same amount of live reclaim. Compact low profile reduces tunnel depth. Rectangular shape allows simple hopper design without the need for expensive circular transition piece between hopper and activator. The UN-COALER mounts on a separate support.A curved arch breaker mounted above the material feeding troughs is designed to transmit vibrating forces into the storage pile without compacting the material. Its leading edges are provided with adjustable baffles which are set in accordance with the materials angle of repose the same as a cut-off gate on feeder hoppers.

Each UN-COALER is foot mounted on steel coil isolation springs, thus the tunnel roof does not have to be designed to withstand the weight of the unit or any dynamic forces. Automated control systems arranged to respond to belt scale, load cell or computer signals, allow individual or multiple unit control of the UN-COALER for selective reclaiming from virtually any point or combination of points along the tunnel.The low profile design of the UN-COALER reduces the cost of foundation excavation since the tunnel does not have to be as deep. Straight-line surfaces eliminate elaborate concrete forming. The few moving mechanical parts of the UN-COALER are easily accessible from the tunnel to minimize maintenance procedures.

As unit trains deposit enormous quantities of material into large hoppers, a series of feeders can be called upon to uniformly distribute the material onto reclaim belt conveyors. The large, rectangular outlet opening of the feeders mounted directly over the conveyor assures maximum draw-down. Adjustable rate units equipped with the counterweight control respond accurately to belt scale, load cell or computer signals to allow precise proportioning or blending. UN-COALERS can be applied with considerable savings in pit depth.

Vibrating feeders can be supplied to match the crusher openings to provide an ideal curtain feed with a uniform distribution to assure maximum crusher efficiency and uniform wear life on the hammer elements. Foot-mounted directly above a crusher, the UN-COALERs low profile, compact straight-line design simplifies hopper and dust seal installation. 100% linear feed rate adjustment can be controlled by the crusher amphere draw or feed hopper load cells.The long, narrow shape of the UN-COALER discharge opening provides the perfect configuration for evenly distributing material across the crusher inlet.

The basic aim of any reclaim system is to activate the larges volume of stored material without resorting to manual manipulation to eliminate rat-holing or segregation. Feeders can be applied to obtain maximum live storage in either windrow or silo storage. the design of systems to reduce the use of dozers has proven to be advantageous in operating costs and eliminating much of the fugitive dust problem generated by the moving equipment.

The illustration below shows an arrangement of feeders which provides 100 percent reclaim of material and at the same time reduces the required storage area. In this system, the material is reclaimed from what are essentially live storage piles through a series of below-grade hoppers. These feeder hoppers are contiguous and arranged to permit pairs of opposed vibrating feeders to feed to a central belt conveyor. The feeder troughs are enclosed and the drive can be provided with explosion-proof motors thus reducing dust problems and the risk of fire. This arrangement makes it convenient to blend materials of various compositions or content by operating appropriate pairs of feeders along the pile. Material is 100% reclaimed from live storage area through a series of UN-COALERs that are foot mounted directly below grade. The contiguous hoppers are arranged to permit the UN-COALERS to feed to a central conveyor belt. Simple straight-line dust seals at the inlet and discharge openings, eliminate dust problems and reduce the risk of explosion. The UN-COALER is mounted completely below grade, reducing hazards during dozing operations. Low profile reduces tunnel depth and concrete cost is cut even further since units are supported from tunnel floor and not suspended from overhead.

This type of bulk storage facility is a V-shaped slot with a bathtub shape having 55 degrees sloped concrete walls in some cases completely covered by a metal building. The upper-most portion of the structure houses a tripper conveyor which will deliver the incoming material to any point along the bunker. A series of UN-COALER activator / feeders, with sizes up to 12 x 12 or larger, are housed in a rectangular concrete reclaim tunnel extending along the entire bottom of the bunker and are positioned to provide 100 percent reclaim. This is an ideal layout for reliable and controlled blending. Any percentage of material can be reclaimedsimultaneously from any portion of the pile. The low profile design of the UN-COALER reduces the cost of foundation excavation since the tunnel does not have to be as deep. Straight-line surfaces eliminate elaborate concrete forming and eliminate the requirement for tepee housing used with plow systems. The few moving mechanical parts of the UN-COALER are easily accessible from the tunnel to minimize maintenance procedures. Discharge is directly on the belt thus eliminating belt tracking problems. Square or rectangular outline simplifies feed opening design, concrete work, and dust sealing.

The fast efficient, high-tonnage method of reclaiming coal from concrete storage silos is to use a series of feeders to extract uniformly across the entire bottom of the silo. For example, a 70 ft. diameter silo would use seven feeders located beneath 10 ft. square openings, three directly over a belt and two on either side, to provide mass-flow unloading while minimizing segregation problems. Two or more silos in tandem facilitate blending.

Several UN-COALER units installed across the bottom of the silo, a 70 diameter silo, for example, would require only four UN-COALER units mounted in-line between the 60 degree inclined discharge chutes compared to at least seven conventional activators and feeders. A significant cost savingsoccurs because of fewer pieces of equipment, simpler and less costly concrete work and installation procedures.

vibrating feeders - kinergy

vibrating feeders - kinergy

Beginning around 1960, the quest to equal or exceed the performance of an Electro-Magnetic Feeder prompted the inception of the most modern version of the Electrically Controlled, Electro-Mechanical type of Vibrating Feeder.

At that time, many unsolved field problems with the newly conceived Induced Vertical Flow kind of Vibratory Machines caused their basic mathematics to be changed to vector equations in hopes of pinpointing the difficulties. This precipitated the formulation of the vectorial Drive vs. Load analysis for a vibratory machine in 1964. Eventually, from this different analytical approach came the discovery of an A.C. Squirrel Cage motor rotating relatively small eccentric weights, combined with sub-resonant tuned stiff drive springs to possess a full range of adjustable output by simply varying the voltage of its power supply. It was 1965 and this simple method of electrical control made the Electro-Mechanical Vibratory Feeder both viable and practical. As the record shows, it met with immediate success and still leads all the other kinds of Electro-Mechanical Feeders available today. The only difference is the VFD, which varies the frequency (hertz), is now the preferred type of full range, zero to maximum, output adjustment that is manual or automatic.

The Kinergy Vibrating Feeder, featuring the Kinergy Drive System, controls the rate of flow of bulk solids from storage in the same way a valve adjusts the flow of liquids. More specifically, a smooth, full range of adjustment from zero to the maximum amount output in infinite steps!

While feeding functions can be achieved with Belts, Aprons, Skip Hoists, and Tramways, only Kinergys Electro-Mechanical Vibrating Feeders provide the full range of zero to maximum TPH rate adjustment of the bulk solid being fed. Just as the valve does for liquids!

Changing the cluster of steel coil springs from being concentrated in one place to being spread or distributed across the width and along the length, larger size Feeders were possible. Today the largest Vibrating Feeders ever built are routinely provided by Kinergy.

Our Vibrating Feeders are the most energy efficient, require minimal maintenance, operate very quietly, and have an electrically adjustable feed rate. When combining these features, Kinergy Feeders obtain the best performance level possible! Thus, the simple design and best performance rating makes the Kinergy Vibrating Feeder the number one choice in Vibrating Feeders.

The Kinergy Drive System has proven to be the most versatile and energy efficient vibratory drive known when applied to Induced Conveying machines. This makes Kinergy Vibrating Feeders the optimal choice. To learn more about these innovative machines, please contact Kinergy at 502.366.5685 or download Kinergys descriptive Bulletin KDF-1 entitled Kinergy Driven Vibrating Feeders.

Realizing vibrations can be very destructive, Engineers seldom considered intentionally creating vibrations in a machine to perform a beneficial function. Even so, over the years and by taking advantage of the principle of Natural Frequency, these purposely vibrated machines have been gradually but steadily improved. Thus, these Electro-Mechanical Machines now have more Electrical Operating Versatility and are ranked among the most Energy Efficient available. This history and the progressive evolution are explained in the Booklet entitled Introducing Vibratory Machines for Material Handling. The booklet is intended to be educational and is available upon request.

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