double roll & teethed roll crusher

double roll & teethed roll crusher

Although its brief period of popularity passed some thirty-odd years since, and only a few sets were installed before interest reverted to other types, the high-speed double roll crusher developed by Thomas A. Edison shortly before the end of the last century warrants a place in any discussion-of crushing equipment. In 1960, the largest machine of this type the 6 x 7 foot giant rolls were huge crushers, judged even by present-day standards; they have an unobstructed receiving opening 7 x 7 foot and their capacity on individual skip-loads of stone is enormous, although, as will be explained, they cannot maintain this peak capacity over a period of time.

Mechanically, the teethed roll crusher is a very simple machine. The two rolls are carried in bearings, supported on two very heavy and rigid bed castings which are secured on the concrete foundation by a number of large anchor bolts. The bearings, in addition to being bolted to these bed castings, are prevented from spreading by pairs of large tie-rods which pass through them above and below the roll shafts. Unlike the smooth-face crushing rolls we have described, these tension rods are not cushioned by springs. The machine is surmounted by a heavy cast rectangular hopper, all sides of which are vertical. Each roll is independently driven by a flat-belt pulley.

The roll-centres are octagonal in cross section, each face being provided with a spline groove and a series of tapped holes for securing the chilled- iron wearing plates. These wearing plates have the sledging knobs, or teeth, cast on their outer surfaces. Thus we have a roll surface that resembles that of the one rollcrusher, except that the faces of all teeth are sloped instead of radial on the advance side. The usual practice is to fit one roll entirely with so-called regular teeth, and the other roll with six rows of regulars and two rows of higher (slugger) teeth.

The peripheral speed, or tip-velocity, of these rolls is much higher than that of any of the machines we have previously described. The range of the smooth-face rolls, for example, is from about 400 ft/min for the small 12-in. rolls, to 2000-2200 feet/minute for the heavy-duty 72 machine. The single-roll crusher has a tip speed of 400-450 ft/min while the 6- x 7-ft teethed roll crusherhas a normal, no-load, surfaces speed of just under 3500 ft/min. It can be readily appreciated that this high velocity induces an extremely violent crushing action, in conjunction with the 3- to 4-in. knobs which protrude from the roll surfaces. Impact, sledging, and pressure crushing enter into the over-all performance; but impact, in this crusher, plays a far more important role than it does in the slower speed single-roll machine; and crushing, even well down along the roll faces, is more in the nature of a sledging action than it is of pressure crushing, for this action occurs in the lower-velocity crushers.

The theoretical maximum size of cube that the knobs will grip, when the rolls are set at minimum spacing, is 24; but the rolls will reduce any stone that can be introduced into the 7-ft square hopper. Large blocks will span across the tops of the two rolls; immediately the slugger teeth on the one roll so equipped go to work on these blocks and quickly shatter them into pieces that can be gripped between the sets of regular teeth; from this point on, the action is a mixture of sledging and pressure crushing. The same selective segregations which we described in connection with the single-roll machine occur in the double-roll crusher; the smaller pieces are cleared quickly, leaving the roils free to work on the larger blocks.

The entire performance on individual skip-loads of stone takes place in a very short period of time. Ten- ton loads of mixed-size medium limestone will clear the crusher in from 10 to 15 sec.; large single blocks, weighing from 6 to 8 tons, are crushed in from 5 to 20 seconds, depending upon the toughness of the individual piece, and upon the way it happens to land in the crushing chamber. These performances were clocked on ma-chines turning out a 6 product.

The short-time transfer of energy, especially when crushing large blocks, is very high; so high in fact that it would not be economically feasible to provide sufficient motive power to deliver it. The usual practice, when these rolls are driven electrically, is to drive the slugger roll with a 250 HP motor, and the regular roll with 200HP,a total of 450 HP. As compared to this motive power, instantaneous energy delivery may run as high as 4000 HP, obviously far beyond the capacity of the motive equipment. But the rolls themselves, when running at normal no-load speed, have a stored kinetic energy of upwards of 4,000,000 ft -lb , and it is this stored energy that does much of the actual crushing, the motors serving to bring the rolls back to normal speed between crushing periods. In crushing a skip-load of stone the rolls may lose anywhere from 30 to 60 RPMin speed; this loss occurs partly through slowing down of the motive equipment, and partly through belt slippage. It requires from 5 to 10 sec. to bring the machine back to speed, during which time the power input will vary from 400 to 600 HP. The power required to run the rolls empty is something less than 100 hp. The average power consumption, when crushing from 3000 to 4000 tons per 10 hour day will run in the neighbourhood of 150 HP on medium limestone.

While the average power consumption of this machine compares favorably with that of other types, the rather violent fluctuation outlined and the relatively high connected horsepower are unfavourable features. It is also natural to expect that the belt slippage we have noted would constitute something of a problem over a period of time. Performance records indicate that belt trouble accounts for about 50% of the total lost time on a set of these rolls, and about 25% of the total maintenance expense.

The type of quarry equipment most commonly used in conjunction with this crusher is the three-sided steel skip, carried on a flat-top truck or flat car. These skips are provided with a shackle on the rear end, which is engaged by a hook actuated by a small hoist. This apparatus slides the skip over against the lip of the receiving hopper, and tilts it to discharge its contents. The skips discharge over a feed-roll which retards the flow of material so that the entire load does not drop into the crushing chamber at once. When the skip is empty it is pulled back on to the truck or car by a counterweight attached to the opposite end of the same cable which performs the hoisting operation.

We have mentioned the heavily ribbed hopper which surmounts the frame and extends up to the level of the feed roll. This hopper serves the double purpose of directing the material into the crushing zone, and preventing stones thrown by the slugger teeth from flying out of the crusher. It is also necessary to cover the top of the hopper with heavy netting to contain flying spalls.The straight-sided, rectangular hopper construction, and the violent agitation in the crushing chamber, tend to minimize blocking and bridging in this crusher. When bridges do occur they are difficult and dangerous to break while the rolls are running.

Practically all that we have had to say about the application of the single-roll crusher will apply as well to the Edison toothed roll crusher. It is better adapted to handling blocky stone than is the single-roll machine, because itsslugging action is much more vigorous, and it will handle any material that will not build up on the sides of the vertical hopper. It is not as simple a machine to feed as the single roll crusher, because its narrow hopper necessitates the uses of skips, or very short-bodied cars. A heavy- duty apron feeder would of course solve this problem, but so far as we know, none of these crushers were so equipped. The high peak capacity of the crusher constitutes something of a problem in plants of medium capacity. It is not economically feasible to provide elevating or conveying equipment to handle peak loads of around 4000 TPH in a plant designed to turn out that much stone in an 8 or 10 hr day; consequently means must be provided to smooth out these high surge loads. This can be taken care of by a surge bin and feeder below the crusher, or by passing the roll product direct to a secondary crusher of uniform-capacity characteristic. A feeder ahead of the rolls would smooth out peaks on mixed feed but. once a 10 or 12 ton block of stone is dropped into the crusher, that quantity comes through very quickly as crushed stone, which would render the regulating properties of the feeder of questionable value.Modified forms of this crusher were used by Edison for secondary and tertiary stages. The crushing equipment in one large plant, for example, comprised a set of 6- x 7-ft rolls (8 product), a set of 4 x 4 feet secondary rolls (3.5 product), and a set of 4 x 3 ft tertiary rolls (1.5 product), these last rolls being in closed circuit. These smaller machines were also run at high speeds, their surface velocities being slightly over 3000 ft/min.

laboratory roll crusher

laboratory roll crusher

The 911MPELRC Laboratory Roll Crushers are typically applied in laboratory or pilot plant applications after primary reduction of the infeed material. Roll crushers operate with a minimum of dust generation and produce a material with a tight size envelope containing a minimum of fines.

Designed for rapid, controlled size reduction of ore, mineral or rock prior to metallurgical testing or further milling or grinding the 911MPELRC Laboratory Roll Crusher has is built with two off same diameter individually powered contra-rotating rolls, so the nipping process produces an ideal crushing environment for a wide variety of materials.

Primary Crushing and for Mid Range Primary Crushing. The crushing capacity and the end-fineness of the sample material depends on the type of crusher and on the breaking characteristics of the sample material.

roller crusher, double toothed roll crusher, smooth roll crusher, teeth roll crusher - ftm crusher company

roller crusher, double toothed roll crusher, smooth roll crusher, teeth roll crusher - ftm crusher company

The crushing capacity of roller crusher machine mainly depends on a pair of cylindrical rollers, which are installed horizontally on frame. Materials are crushed under the active force of rotational rollers. Therefore, we call it roller crusher.

1. Users can take the roller crusher to crush mineral ores with medium harness. Since the shape, size and array of teeth on roller surface can be changed with the property of raw material, either the secondary or tertiary crushing is easy to realize.

3. If the compressive strength of raw material is less than 160MPa, clients can take use of the smooth roll crusher. Double roll crusher has advantages like small discharging size, cheap price, strong wearable parts and reliable operation, etc.

1. If some non-crushing material enter into the space between rollers like drill bit, severe consequence will occur. Therefore, before crushing the material, smooth roller crusher should equip an device for absorbing iron and other matters.

2. If the double roll crusher works for a much longer period of time, the discharging size of finished products will be overly fine. At this time, users should adjust the discharging mouth or overhaul the whole machine.

The so-called double toothed roller crusher has discharger on its roller, which can clean tooth ace and roller surface. The applied material for teeth roller crusher are diverse. Double toothed roller crusher can crush limestone and rocks with compressive strength more than 200MPa. However, the most suitable materials for teeth roll crusher are clammy ones with water content between 25%-30% or hard material with mud inside. Since the teeth roll crusher has advantages like little dust, low noise and small floor space, etc, more and more people would like to throw olive branch to it.

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double roller crusher, double roller crusher manufacturer-forui roller crusher

double roller crusher, double roller crusher manufacturer-forui roller crusher

Double roller crusher is suitable for secondary crushing & fine grinding work which compressive strength is less than 250 Mpa, the moisture is less than 35% of the solid material,Such as broken iron ore, quartz, potassium sodium feldspar, limestone, pebbles, silicon metal, barite, basalt, granite, steel slag, cement clinker, construction waste (concrete), shale, quick lime, coal, coke, clay, bentonite, chemical raw materials etc. It can be widely used in mining, thermal power, cement, ceramics, metallurgy, chemical industry, building materials and other industries, with the use of low maintenance costs, reliable performance, low power consumption, less dust, low noise etc characteristics.

The double roller crusher consists of two cylindrical rollers as the major body of work. When the crusher works,two circular rollers do the rotation in the opposite direction,due to the friction between the material and the rollers, the materials of feeding was involved in Crushing cavity which is formed by the two rollers and was crushed.Broken products under the action of gravity, discharged from the gap between the two rollers, the size of the gap determines the finished product of maximum size.

1. Low wear parts, only roller skin, we get the patent of our roller skin, the material is high manganese steel with tungsten, tin, chromium and other rare metals. very wear-resistant and high temperature resistant; 2. Compact structure, lower noise and efficiency; 3. Pressure and particle size are adjustable easily; 4. Self-protection, the parts can not be damaged when hard materials such as the metals goes into the crushing cavity; 5. Good performance, low cost in operation and easily maintenance.

Flat roller surface is suitable for feeding size which less than 80 mm, the finished product granularity requires 0.5-10 mm finely work. Such as by using of pebbles, construction waste to manufacture artificial sand; In mining industry, crushing iron pre, quartz;In ceramic industry, crushing raw materials; In metallurgical industry, crushing coke, quick lime, bunt lime;In Coking pant, crushing coal powder; In chemical industry, crushing all kinds of raw materials or the similar occasions.

Surfacing roller surface is suitable for feeding size less than 150 mm; the finished product granularity requires 3-30 mm finely work. Such as in cement industry, pre crushing cement clinker, limestone and composite materials before the ball mill, Raymond mill; In Coal water slurry industry, pre crushing coal before the ball mill, Raymond mill; In Iron ore industry, pre crushing steel slag, iron ore, silicon ore before the ball mill, Raymond mill; In brick making factory, crushing various ores to make bricks; In thermal power plant, crushing coal or the similar occasions.

roll crusher manufacturer & design | williams crusher

roll crusher manufacturer & design | williams crusher

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Williams is an industry-leading roll crusher manufacturer and designer for high-quality roll crushers with desirable benefits such as high throughput capacity, minimal maintenance requirements, low cost per ton operation, and more. Learn more about our heavy-duty roll crushers below or contact our sales engineers to talk about your application needs.

A combination of impact, shear, and compression are the forces necessary to perform the crushing and size reduction in a Williams roll crusher. The material enters the roll crusher machine and is impacted by the roll as it rotates. Then, as the material is pulled between a crushing plate or rolls, shear and compression forces act upon the material. The rolls act as flywheels, contributing to smooth operation and efficient use of power. Roll crushing surfaces operate at a fixed distance apart, as opposed to the continually changing distances in a jaw or cone crusher. This creates a more consistent product size.Roll crushers are low in profile and relatively easy to install. They can be fed with a minimum of headroom, or even choke fed. Adjustments are simple andinternal parts are readily accessible.

Typical feed materials for Williams Roll Crushers include: bauxite, cement clinker, chalk, cinders, clay, coal, glass, gypsum, limestone, burnt lime, rock salt, sandstone, shale, sulfur ore, sea shells, and sewer sludge clinker. Single Roll Crushers, sometimes called lump breakers, can also be used for breaking frozen or agglomerated materials.

Williams Roll Crushers are used in a variety of industries such as, mining recycling, and power industries. Interested in learning more about the Williams Roll Crushers for your specific industry and application? Contact our sales engineers!

Choosing between a single roll crusher and double roll crusher depends upon the type of feed material, feed size, product size desired, and consistency of both feed and product. Both single and double roll crushers operate most efficiently with dry, friable materials. However, single roll machines have been widely and successfully used for the reduction of moist clays. They also have been long used as primary and secondary coal crushers, both at mine sites and power plants, where a minimum of fines is desired.

Williams single roll crushers reduce via a combination of impact, shear, and compression. The rolls are always toothed in patterns suited to the feed material. Single Roll Crushers generally handle larger feed sizes at higher reduction ratios in higher capacities and are particularly well suited to be used as lump breakers.

Double roll crushers reduce primarily through compression, although some shear is obtained with toothed rolls. Rolls for these crushers come in combinations of smooth, corrugated, and toothed designs. Double Roll Crushers produce a finer product at lower reduction ratios and capacities.

Oversized, heat-treated, alloy steel shafts plus self-aligning, roller-type bearings assure long life and maximum use of power. Jackshafts for control of roller speed are standard on double roll crushers, optional on larger Single Roll Crushers.

Heavy-duty compression springs permit movement of floating roll to pass tramp metal and other uncrushables, avoiding overload and damage. Smaller Single Roll Crushers are equipped with a shear pin release.

Faces Tooth patterns and corrugations to fit feed material; abrasion-resistant alloy; easily replaceable. Ash Crushers have additional features including dust-tight design and sealed cover plates for breaker plate access.

Williams Single Roll Crushers are also available in a 15 inch (381mm) diameter dust-tight version for applications such where it would be expensive to have dust collection air. Already well known for rugged construction, low profile, high reduction ratio, and economical cost, Williams Dust-Tight Ash Single Roll Crushers also have easy access to the rotor for maintenance. These dust-tight roll crushers are perfect for applications such as crushing ash, limestone, coal, or glass.

double roller crusher - jxsc machine

double roller crusher - jxsc machine

Capacity2-140 T/H Fedding size150mm Discharge size2-50m Crushing MaterialRiver pebble, granite, basalt, iron ore, limestone, quartz, gangue and so on. ApplicationSuitable for crushing brittle bulk materials in cement, chemical, electric power, mining, metallurgy, building materials, refractory materials, coal mines, etc.

Whats the double roller crusher The Doule Roller Crusher, also known as roll crusher, toothed roll crusher, is suitable for fine crush the medium hardness rock with compressive strength 160MPa, such as ore, rock, coke, coal, clinker, ceramic raw materials, slag, refractory materials, and chemical materials. According to the number of rolls, the roll crushers can be divided into single roll crusher, double roll crusher or, four roll crusher. Double roll crusher is the most used type. We produce industrial roller crushers and laboratory uses small roll crusher. Advantages Replacement wear-resistant lining, long service life, convenient maintenance. Compact structure, lightweight, small size, for the same production capacity requirements of the crushing system, equipped with roller crusher can significantly save investment. The width of the discharge opening can be adjusted to determine the crushed material size. High reduction ratio, low vibration, dust removal, and less noise. High efficiency, low consumption, uniform granule, good granule shape. Roller crusher manufacturer JXSC, a Chinese rock crusher manufacturer, supply roll crushers global, we establish a wear parts supply system to meet customers parts replacement needs are met and reduce the downtime. Factory price, fast delivery, one year warranty, on-site installation, support roll crusher design.

Main partsBearing box, roll shell, bearing housing, adjusting rod, motor, carrier, fixed roller, movable roller and safety spring, etc. Working Principle of Double Roller CrusherThe roller of the roller crusher is supported by the spring pressure. Under normal working conditions, the spring force is sufficient to overcome the crushing force of the crushed material. By changing the number of spacers between the frame and the movable bearing, the width of the discharge port between the two rolls can be adjusted to adjust the grain size. When there is a material that cannot be broken into the crushing chamber, the spring is compressed, and the movable roller is retracted to increase the discharge opening. After the material is discharged, the movable roller is reset under the spring pressure. OperationThe main wearing part of the roller crusher is the crushing roller. Precautions as follows: Iron removal before crushing; prevent sticky mud clogging; pre-pick out the large ore rock; good lubrication condition.

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