Beltelt deviation rule

According to the practical experience of production, some belt deviation rules are summarized as follows:

(1) Running loose and not running tight: During the transportation of the belt machine, if the center lines of the front and rear rollers are not parallel, resulting in different degrees of tightness on both sides of the belt, the belt will deviate to the loose side;

(2) Running high and not running low: the supporting roller is not in the same horizontal position parallel to the running direction of the belt, but one end is high and the other is low, then the belt will deviate to the high end;

(3) Running after running, not running forward: The idler is not on the section perpendicular to the running direction of the belt, but one end is in front and one end is behind (depending on the running direction of the belt), then the belt will deviate from the rear end.

Influencing factors of belt deviation

The influencing factors of conveyor belt deviation can be divided into the following categories:

①Insufficient rectification performance will cause wear on the sides of the belt and the frame, or even roll over the belt, which will have a great impact on the life of the belt and its stability. Therefore, it is necessary to understand as many measures as possible to correct deviations for different situations.

②The belt deviation caused by the center of the components of the conveyor is not in a straight line. This reason is usually that the center is not adjusted well when the machine is installed, resulting in uneven force on the conveyor belt, causing wear, which not only reduces the the quality of use is also easy to cause deviation, and in severe cases, the belt will break.

③The uneven placement of materials on the conveyor belt causes the belt to shift, resulting in uneven pressure distribution on the conveyor belt. Excessive pressure on one side will cause the belt to shift.

④ During the operation, the vibration causes the deviation, and the operation of the equipment inevitably produces vibration. The greater the vibration, the greater the deviation of the belt. In the belt conveyor, the vibration caused by the radial runout of the idler has the greatest influence on the belt deviation.

⑤ The quality of the conveyor belt is damaged and the deviation caused by aging, etc., when conveying items is prone to friction and damage to the conveyor belt. Long-term use will also cause aging, which will naturally cause the conveyor belt to drift.

Belt deviation adjustment method

1.Offset roller method

When the deviation range of the belt conveyor is not too large, the rule of “running after running but not running forward” of the belt can be used to automatically adjust the groove type deviation adjustment idler. When the belt is deviated, it encounters the blocking roller on the grooved deviation adjusting roller, and moves forward along the running direction of the belt due to the friction between the blocking roller and the edge of the belt, and the other side moves relatively backward. At this time, the tape moves toward the side of the backstop roller until it returns to the normal position.

2.Gravity adjustment method

If the belt is deviated under heavy load, the rollers and idler brackets on which the belt is deviated can be properly heightened, so that the self-weight of the material on the belt can generate a component force that prevents the belt from deviating until the belt returns to the normal position.

3.Vertical roller deviation adjustment method

If the belt always deviates to one side when running, the idler roller (vertical roller) can be installed vertically on the side of the belt, so that on the one hand, the belt is forcibly reset due to the force of the vertical roller; on the other hand, due to the vertical roller and the belt. The friction effect of the edge reduces the linear speed of the deviation side of the belt, and increases the linear speed of the other side of the belt relatively, so that the belt moves to the other side until it resets.

4.Pad height adjustment method

If the belt idling always deviates to one side, use the rule of “running high but not running low” of the belt, and the opposite side of the idler bracket can be properly elevated, and the front and rear elevating arrays are supported by the first pad. Roller shall prevail, slowly reduce the height of the pad, and the deviation of the belt will disappear.

5.Roller cleaning method

If the belt runs off a certain fixed point and remains fixed, check whether the idler at this point stops, sticks mud, etc., which causes the diameter of the roller to change or the idler falls off, and take corresponding measures.

6.Adjust the tensioner

If the belt machine deviates left and right when running, and there is no fixed direction, it means that the belt is loose, and the tensioning device should be adjusted to tighten the belt, and the deviation will disappear.

7.Narrow belt adjustment method

If the belt deviates at the nose or tail of the machine during operation, the parallelism error of the head and tail rollers should be eliminated first, and then use a 200mm×200mm narrow belt on the other side of the roller where the nose or tail deviates. drum and rotates with the drum. According to the formula of circular kinematics, the linear velocity of the belt at the roller is v = ω R, where ω is the rotational angular velocity of the roller, and R is the radius of the roller. Therefore, the running line speed of the belt on the deviation side is not only lower than that of the other side, but also the belt on the deviation side is looser than the other side. When adjusting in this way, the belt will move to the other side until it reaches the normal position, and then take out the narrow belt, and the belt machine runs normally.

8.Rolling drum deviation adjustment method

If the belt deviates at the roller, it means that the roller moves horizontally, there is sticky material (making the diameter of the cylinder larger or different), or there is an installation error, and the levelness and parallelism of the front and rear rollers should be corrected according to the situation will disappear.

9.Drag reduction method

If the deviation of the belt is not too serious, the idler on the side of the deviation of the belt should be cleaned up, and a few drops of mechanical oil should be dropped on the bearing of the idler to reduce the frictional resistance of the rotation of the idler, so that the rotation angular speed of the idler can be accelerated eliminate belt misalignment.

10.Flow correction method

If the belt is running, the idling does not deviate, and the heavy-load operation deviates, indicating that the material is unevenly distributed on both sides of the belt, and the loading funnel is not correct. The funnel should be corrected or a guide plate should be installed in the funnel to change the blanking angle to achieve any adjustment at any time. Material flow direction, so that the material on both sides of the belt is evenly distributed.

11.Joint calibration method

If the belt always deviates to one side, the maximum deviation is just at the joint, and the deviation position is not fixed, indicating that the joint of the belt is not correct, and the joint should be recalibrated or a new joint should be glued.

12.Bracket Correction Method

If the belt deviates to the same side and is serious in a certain position, it means that the idler bracket or frame is not twisted correctly. Correct the horizontality and verticality of the bracket or frame, and replace the seriously twisted idler bracket.

13.Belt repair method

If the edge of the belt is severely worn, the tension on both sides of the belt is inconsistent, and the position of the belt is not fixed, the belt should be repaired or replaced with a new belt in time according to the actual situation.

14.Roller deviation adjustment method

If the belt always deviates to one side with no load, you can remove 3 of the 4 fixing bolts connecting a set of idler brackets and the frame at the center of the deviation side of the belt, leaving one as the shaft. When the belt deviates to the side where the person is standing, the bracket can be moved forward by an appropriate angle along the running direction of the belt; on the contrary, when the belt deviates to the other side, the bracket can be moved to an appropriate angle against the running direction of the belt, and then if it is fixed, the deviation will disappear naturally (its function is equivalent to a grooved deviation adjustment idler, using the rule of “running after running but not running before”).

15.Tightening device method

If the belt deviates to the same side during no-load and heavy-load operation, it means that the tightness of both sides of the belt is different, and the tensioning devices such as the lead screw or counterweight at the front and rear rollers should be adjusted according to the principle of “running tight but not loose” .