Rotary Kiln Support Wheel (Trunnion)
The adjustment of the Rotary Kiln Support Roller refers to the reasonable adjustment and control of the rotary kiln in order to ensure the long-term safe and stable operation of the rotary kiln, so as to maintain a good operating state, improve the operation rate and reduce the running cost.
In the normal production state, the center line of the kiln cylinder is ensured to be a straight line, so that the kiln body can reciprocate between the two gear rollers along the axial direction, thereby achieving the stress balance of the various supporting rollers, the belts and the bearings, and eliminating the partial deviation. Unreasonable factors such as grinding and concentration of force points to reduce wear, reduce maintenance costs, and extend the safe operation cycle of rotary kiln.
Causes and regulation editing of axial turbulence
The rotary kiln cylinder is mounted with a 3.5% slope. According to the theoretical analysis, the contact between the roller and the roller has a downward force generated by the downward gravity along the center line of the cylinder, and the large ring gear drives the circular force generated by the rotation of the cylinder, and the direction thereof is along the tangential direction of the support roller. The sliding force is vertical. Due to the combined action of the circumferential force and the sliding force, the contact between the belt and the roller is elastically deformed to form an elastic sliding, so that the cylinder is tilted downward. The swaying speed is proportional to the circumferential speed of the belt and the inclination angle of the cylinder, and inversely proportional to the friction coefficient between the roller and the roller.
The continuous squat of the cylinder is limited by the lower retaining roller. The rotary kiln cylinder is blocked by the retaining roller by the steel plate retaining iron, the oblique side of the roller belt and the outer tapered surface of the retaining roller, and no longer squats in the axial direction. The kiln body will rotate in a fixed axial position. In the long run, the surface of the roller and the belt will be unevenly worn, and the surface busbar will be uneven. The ribs and burrs will appear on both sides of the large and small gears. Cracking of the roller with iron retaining seams and other phenomena has occurred, not only worsening the working conditions, burying hidden dangers, but also increasing the difficulty of annual maintenance and maintenance costs. Therefore, it is necessary to change the running state of the rotary kiln, adjust the posture of the support roller center line, realize that the rotary kiln cylinder can reciprocate up and down, and control the second-speed thrust roller belt to a position slightly above the two gear rollers. The upper and lower two-rollers are basically not affected by the external force caused by the kiln cylinder turbulence. The axial turbulence distance of the rotary kiln (ie, the gap between the two-roller and the thrust roller) is 6 mm, and it is determined to be adjusted to 15 mm.
Editing method of adjusting the roller
According to the technical data and the commonly used roller skew adjustment method in the industry, in the operation, the center line of the two-speed roller and the center line of the kiln cylinder are inclined at a certain angle, so that the supporting roller in turn gives the roller an upward force to balance The sliding force generated by the weight of the cylinder realizes the dynamic balance of the axial force of the kiln cylinder.
When the center line of the roller is installed parallel to the cylinder, the cylinder will produce a theoretical elastic sliding force and will collapse downward. In order to control the squat of the cylinder, the supporting roller must be tuned during the operation of the equipment, so that the center line is at an angle θ with the center line of the cylinder. From the projection view, the axes of the two supporting rollers are parallel, and at the same time, the angle is deflected counterclockwise. θ, the upward splitting speed generated by the tilting of the supporting roller is exactly offset by the sliding speed of the cylinder, and the downward sliding force of the cylinder and the upward force of the supporting roller reacting on the roller, so that the second-speed thrust roller belt is controlled in two Between 15mm of the retaining roller, the relative balance and stability of the cylinder are achieved.
The rotary kiln is supported by two gears. The sensitivity of the control is high. It is required that the center lines of the four rollers in the first and second gears are deflected in the counterclockwise direction and parallel to each other to ensure that the two-speed idler can simultaneously feed the belt. With the upward force, avoid the phenomenon of "big eight characters" and "small eight characters". The “big eight character” is the center line of the four supporting rollers of the first and second gears. The center line of the two-speed supporting roller shaft is opposite in direction, and the center line of the supporting roller shaft forms two “eight” shapes on the lateral direction of the kiln body. The forces on the belt cylinders are either opposite or opposite to each other, which cancel each other out, which is harmful and unfavorable, accelerates the wear on both sides of the belt and the iron, and forms a stretch or squeeze on the cylinder between the two gears. Pressure action, it is possible to get rid of the iron block or even an accident; the "small squad" is the opposite of the center line of the two supporting rollers of the same gear, and the axial center line is oppositely skewed, forming an "eight" symmetry to the center line of the kiln body. "Zigzag", the direction of the force acting on the belt cylinder of the two supporting rollers is inconsistent, and no resultant force is formed. Not only does it not play a regulating role, but it will cause additional distortion of the roller belt and reduce the contact between the roller and the roller belt. area.
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