Causes and treatment methods of conveyor belt deviation of belt conveyor

  • 8 min read

What is a belt conveyor

Belt conveyor, also known as belt conveyor, is a kind of vibrating mechine equipment for material transportation commonly used in mineral processing plants. The belt (conveyor belt) moves according to the principle of friction transmission, and the belt plays an important role as a load-bearing and conveying device.

The belt conveyor is a vibrating machine that is driven by friction to transport materials in a continuous manner. It is suitable for conveying easy-to-take powder, granular, small-block low-grinding materials and bagged materials.

Belt conveyors
Belt conveyors

Causes of Belt Deviation of Belt Conveyor and Treatment Skills

During the beneficiation process, belt deviation is one of the common problems of belt conveyors, that is, during operation, the centerline of the belt deviates from the centerline of the conveyor, thus deflecting to a certain side.

In production practice, the problem of belt deviation will not only affect the normal production of the dressing plant production line, but also cause severe friction between the belt and the frame, resulting in softening and scorching of the belt, and even causing a fire in severe cases.

Belt deviation caused by three major installation errors

  • Reason 1: The belt joint is not correct and uneven。 This will cause uneven tension on both sides of the belt, and the belt will deviate to the side with higher tension.
  • Reason 2: The rack is skewed (including the skew of the center line of the rack and the inclination of the two sides of the rack)。This can cause the belt conveyor belt to misalign severely and be difficult to adjust.
  • Reason 3: The pressure of the rubber plates on both sides of the guide groove is uneven。This will cause inconsistent running resistance on both sides of the belt, which will cause the belt to deviate。

Three Tips for Solving Such Problems

Solution 1: Adjust the tension on both sides of the rotating drum or reversing drum

In view of the unevenness and unevenness of the belt joint, the tension force on both sides of the rotating drum or the reversing drum can be adjusted. If the situation still cannot be improved after adjustment, the belt connector needs to be reconnected. When connecting the belt joints, it is necessary to ensure that the joints are straight and flat.

In addition, in order to ensure the grooving of the belt at the joint, it is recommended to nail the belt buckle in sections along the length of the grooved roller when nailing the belt buckle.

Solution 2: Keep the same straight line at the center line of the head, tail and middle frame

If the center line of the conveyor is skewed, adjust the head and tail to ensure that the center lines of the head, tail and middle frame are on the same straight line. If the deviation in the middle part still cannot be corrected, the rack needs to be reinstalled.

Solution 3: Readjust the pressure of the rubber plates on both sides

The problem of uneven pressure on the rubber plates on both sides of the guide groove is relatively simple, just readjust the pressure of the rubber plates on both sides.

Belt conveyors
Belt conveyors

The belt conveyor belt deviates during operation

As a kind of vibrating mechine equipment,When the belt conveyor is in normal operation, the conveyor belt is in a closed loop, the upper and lower conveyor belts run at a constant speed, and the center lines of the operation are parallel to each other, and the offset generated in the direction of the conveyor belt is kept within the specified range. There are many reasons for the deviation of the belt conveyor belt during operation, such as drum or idler sticky material, belt slack, uneven distribution of mineral materials, and vibration during operation.

Five measures to solve such problems

Solution 1: Adjust the roller set

During operation, if the belt deviates to one side in the load-bearing section, it indicates that there is an error in the perpendicularity between the installation position of the load-bearing idler set and the center line of the belt conveyor. You can install an automatic self-aligning idler set to adjust, or use The adjusting eye is used to adjust the position of the roller group. Which side of the belt is deflected, which side of the idler set will move forward in the direction of belt conveyor belt running, or the other side will move backward.

The adjustment of idlers needs to start from the deviation point, the adjustment amount of each idler should be small, and the number of adjustment idlers should be large, so as to obtain a better deviation adjustment effect. Also, it is recommended to adjust only one side to avoid confusion.

Solution 2: Adjust the position of the rotating drum and the reversing drum

The belt conveyor generally has more than 3 rollers, and the installation position of all the rollers must be perpendicular to the center line of the belt conveyor in the length direction. If the deviation is too large, deviation will inevitably occur.

  • If the belt of the belt conveyor deviates at the unloading roller of the machine head, which side the belt deviates from, adjust the roller shaft of which side along the running direction of the belt for a small distance (by adjusting the adjusting bolts of the bearings on both sides of the roller) );
  • If the belt deviates at the tail reversing roller, the roller on the side where the belt runs loose should be moved forward along the running direction of the empty belt (by adjusting the bolt);
  • If the belt deviation occurs between the drive pulley and the reversing pulley in the tape storage bin, it can be dealt with by referring to the adjustment method of the head unloading pulley.

Solution 3: Clean the surface of the drum or replace the drum again

The processing error of the surface of the roller, or the diameter is different due to wear or adhesion on the surface, etc., and the belt will deviate to the side with a larger diameter. At this time, the surface of the roller needs to be cleaned or replaced.

Solution 4: Adjust the tension

In addition to being perpendicular to the length direction of the belt, the reversing pulley at the tension point should also ensure that its axis centerline is horizontal. When the hydraulic cylinder is used for tensioning, the bearing seat of the tensioning drum should be translated at the same time to ensure that the axis of the drum is perpendicular to the longitudinal direction of the belt.

When the belt conveyor is running, if the tension of the belt is not enough, the belt will not deviate when it is empty or with a small load, and it will deviate when the load is slightly larger. A suitable tensioning device must be selected to ensure that the belt has sufficient tension. Tight force.

Solution five: rectify the blanking position at the reprint point

The feeding position of the material at the transfer point has a great influence on the deviation of the belt. Generally, the relative height of the upper and lower belt conveyors at the transfer point should be considered. The lower the relative height, the greater the horizontal velocity component of the material, and the greater the side impact on the lower belt; at the same time, it is difficult for the material to be centered, so that the material on the belt is deflected, resulting in belt deviation. Therefore, the baffle plate can be added to block the material, and the falling direction and position of the material can be changed.

Belt conveyors

Final Words

The above are the main reasons and corresponding solutions for the belt deviation of the belt conveyor. Sometimes, the reasons for the belt deviation of the belt conveyor are more complicated, and the treatment effect of a single method is not ideal, and multiple adjustment methods may be required. It is recommended that the concentrator purchase from professional belt conveyor manufacturers. While obtaining high-quality belt conveyors to ensure the normal production of the concentrator, it also obtains sufficient technical support for subsequent equipment problems.

Read More:vibrating machinery