The rotary kiln is mainly composed of a cylinder, a transmission device, a supporting device, a wheel blocking device, sealing of kiln head and kiln tail,and a kiln head cover. The supporting device of the supporting rollers carries the weight of the whole kiln barrel, and plays a positioning role on the barrel, so that it can run safely and smoothly. The temperature rise of rotary kiln support rollers is a common phenomenon, and there are many causes.
If the lubricating oil of the bearing wheel is not changed or maintained for a long time, it will cause the viscosity of the lubricating oil to decrease, the emulsification of the oil quality, and the dust impurities in the oil, etc., which can cause the bearing bush to heat up. Only by regularly replacing the new oil and strengthening the daily maintenance of the roller bearing can we effectively prevent the temperature rise of the roller which caused by the lubricant.
If the seal of the idler shaft is damaged, oil leakage will occur, the oil level will decrease, or the lubricating oil spoon will fall off, which will cause the bearing bush temperature to rise. Therefore, it is necessary to do the routine inspection of the roller seal, replace the seal ring in time, and tighten the lubrication spoon.
If the circulating water system is not cleaned for a long time, the pipeline will be blocked, causing the circulation water to flow improperly or in a small amount, which will cause the bearing shell to heat up. When the circulating water pipe inside the idler is aging and ruptured to produce water leakage, the viscosity of the lubricating oil is destroyed, the oil quality is deteriorated, and the temperature of the bearing shell rises. The treatment measures are: pickling the circulating water pipe, removing the internal oily impurities, and replacing the damaged internal water pipe.
The idler bearing is used for a long time, and the contact angle between the bearing and the shaft will become larger and larger due to friction. At the same time, the contact gap between the bearing and the shaft will become smaller and smaller to a certain extent. Lubricant cannot enter the bottom of the bearing for lubrication. Causes bearing bush temperature rise. After finding that the gap of the tile opening is small, it should be repaired in time and the tile opening should be reopened. Generally, the gap of the tile opening is 0.003Dmm (D is the diameter of the supporting shaft).
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Chaoyang Runxing Heavy Machinery Manufacturing Plant was established in 2005,As a famous Rotary kiln bearing Company and China OEM Rotary kiln bearing Service Provider,our factory area is located in....
FEECO is a leading manufacturer of highly engineered, custom rotary kilns for processing solids. Our high temperature kilns have earned a reputation for their durability, efficiency, and longevity. We offer both direct- and indirect-fired units.
Rotary kilns work by processing material in a rotating drum at high temperatures for a specified retention time to cause a physical change or chemical reaction in the material being processed. The kiln is set at a slight slope to assist in moving material through the drum.
Direct-fired kilns utilize direct contact between the material and process gas to efficiently process the material. Combustion can occur in a combustion chamber to avoid direct flame radiation, or the flame can be directed down the length of the kiln.
All FEECO equipment and process systems can be outfitted with the latest in automation controls from Rockwell Automation. The unique combination of proprietary Rockwell Automation controls and software, combined with our extensive experience in process design and enhancements with hundreds of materials provides an unparalleled experience for customers seeking innovative process solutions and equipment.
Indirect-fired kilns are used for various processing applications, such as when processing must occur in an inert environment, when working with finely divided solids, or when the processing environment must be tightly controlled.
Calcination refers to the process of heating a material to a temperature that will cause chemical dissociation (chemical separation). This process is used frequently in the creation of inorganic materials, for example, the dissociation of calcium carbonate to create calcium oxide and carbon dioxide.
Thermal desorption is also a separation process. This process uses heat to drive off a volatile component, such as a pesticide, from an inorganic mineral, such as sand. The component is vaporized at the increased temperature, causing a separation without combustion. In some cases, an indirect rotary kiln would be best for this application, because the volatile chemicals may be combustible. The indirect kiln will supply the heat for desorption, without the material coming into direct contact with the flame.
Organic combustion refers to the treatment of organic wastes with the intent of reducing mass and volume. Organic waste is treated in the kiln, leaving behind an ash with considerably less mass and volume. This allows for more efficient and effective deposit of waste materials into landfills.
Sintering is the process of heating a raw material to the point just before melting. This increases the strength of the material, and is commonly used in the proppant industry, where sand or ceramic materials are made stronger.
Heat setting involves bonding a heat resistant core mineral with another, less heat resistant coating material. Unlike an unheated coating process, here, a rotary kiln heats the coating material to just below liquefaction point, allowing it to coat the heat resistant core more evenly and more securely. This process is commonly seen in the manufacture of roofing granules, where a mineral such as granite is coated with a colored pigment, producing a product that is both durable and aesthetically pleasing.
Reduction roasting is the removal of oxygen from a component of an ore usually by using carbon monoxide (CO). The CO is typically supplied by mixing a carbonaceous material such as coal or coke with the ore or by feeding it separately. Examples are the reduction roasting of a hematite containing material to produce magnetite that can be magnetically separated. In the Waelz process, zinc oxide in steel mill wastes is reduced to metallic zinc and volatilized for recovery in the off-gas system.
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The advantages to a FEECO rotary kiln are that it is built to the highest quality standards and is backed by over 60 years of process design experience. The FEECO Innovation Center offers batch and pilot scale kilns that can simulate conditions in continuous commercial rotary kilns, allowing our customers to test small samples of material under various process conditions, as well as part of a continuous process. With options in both co-current and counter-current flow, and direct or indirect configurations, the FEECO test kilns offer a variety of options to suit your thermal testing needs. We also offer support equipment such as a combustion chamber, afterburner, baghouse, and wet scrubber for testing.
The thrust roller is an important auxiliary part of a rotary kiln. It is designed to control the axial vibration of the rotary kiln, so that the tyres and rollers can be evenly distributed on the full width. At the same time, it can ensure the linearity of the kiln body centerline, make the big and small gears mesh well, and reduce the power consumption of the kiln process.
The weight of the kiln body cylinder is loaded on the thrust roller through the tyre, and generates radical force and axial force acting on the thrust roller. The radial force makes the cylinder slide downward, and the role of the thrust roller is to overcome the sliding force and push the cylinder to move upward.
Assuming that the total mass of the rotary kiln cylinder is G, the inclination of the rotary kiln is sin , and the angle of the thrust roller is , the radial thrust Fx and axial thrust Fy of the hydraulic roller are:
As the blueprint shows, the thrust roller is loaded on a support with two guide sleeves, through which the two guide shafts are connected to the support. On the support, there is also installed the hydraulic cylinder, and the thrust roller can move back and forth on the guide shafts through the control of the hydraulic oil.
Though hydraulic thrust rollers share the same working principle, there are still some differences in their structures. The thrust rollers are mainly divided into tri-bearing structure rollers and bi-bearing structure rollers.
The thrust roller and the axle are fixed and assembled and loaded in the hollow shaft to make it a thrust roller body. Three bearings are installed between the hollow shaft and the axle. Two of the three bearings are self-aligning roller bearings, which mainly bear the radial force of the thrust roller. A thrust bearing is also installed at the bottom of the hollow shaft, which mainly bears the axial force of the retaining wheel. The three sets of bearings bear the resultant force of all external forces so that the thrust roller is in a stable state.
The thrust roller and the axle are an integral structure, which is connected with the hollow shaft through bearings to form a thrust roller main body. Two bearings are installed in the hollow shaft, one of which is a self-aligning roller bearing, which mainly bears the radial force of the thrust roller; a thrust bearing is also installed at the bottom of the hollow shaft, which mainly bears the axial force.
In the tri-bearing structure, the radial force of the thrust is borne by two self-aligning roller bearings. In the distribution of force, theoretically, two bearings can share the total thrust, but in the actual production process, it is difficult to accurately calculate which bearing bears how much force. So in the design process, to be on the safe side, the upper bearing needs to bear all the thrust to ensure the normal operation of the thrust roller; and the middle bearing can be selected within the design scope according to the structure requirements. This ensures that in extreme cases, the thrust roller can still operate normally.
In the bi-bearing structure, only one bearing bears the radial force, so we only need to consider its bearing capacity. In order to ensure the rationality of the design, the bi-bearing structure is simpler than the tri-bearing system. In the tri-bearing structure, the movement of the bearing adopts the form of tightening inside and loosening outside, which makes the thrust roller rotate through the locking force of the inner ring of the bearing, while the structure of the bi-bearing is opposite, because the thrust roller and the axle are integrated, when the thrust roller rotates, the bearing tightens outside and loosens inside.
Due to the large variation of rotary kiln operating conditions, the total thrust F under these two structures may be affected by many external factors and change greatly, such as the materials in the kiln, the impact of the spherical mixture on local parts, the change of the force of single thrust roller after the change of the centerline, the friction force between the thrust roller and the contact surface of the supporting ring, etc. The direction and size of the resultant force F change constantly when the rotary kiln cylinder rotates. Due to the insufficient self-locking force of the self-aligning roller bearing in the axial direction, the vertical shaft of the thrust roller moves up and down and sways.
Although, theoretically, there is only downward pressure in the axle of thrust roller, in actual production, when the axle moves up or sways, the lower thrust bearing bears not only axial force, but also certain radial force, which may cause the bearing roller to disengage from the track, destroy the bearing force balance, and result in excessive local force and damage. Therefore, at the beginning of the design, some extreme considerations must be taken into account to ensure the stable performance of the thrust roller.
As the core device in a cement plant, the rotary kiln must be able to work safely and stably even after a long time of continuous operation. And in mechanical designs, a simple structure is usually more stable than a complex one.
As to the two widely used thrust roller structures, the tri-bearing structure is small in size, but has more parts and a rather complex design; the bi-bearing structure is large in size, but has a simpler design and is more stable in operation.
Rotary kiln bearingare generally used on the large kiln. The advantages are strong bearing capacity, stable, reliable and noise-free.Our factory process, repair and retreadvarious rotary kiln bearings according to customers drawings. The OEM and ODM customizationservices are provided.
Chaoyang Runxing Heavy Machinery Manufacturing Plant was established in 2005,As a famous ROTARY KILN BEARING Suppliers and OEM ROTARY KILN BEARING Factory,our factory area is located in....Get in Touch with Mechanic