Why Is The Conveyor Belt Always Running At The Fixed Position Of The Conveyor?

- Jun 17, 2019-

Conveyor frame is not aligned

Keeping the center line of the conveyor in a straight line is an important condition for the normal operation of the conveyor belt. When installing the frame of each section in the early stage, it must be aligned with the center line. The error should be controlled at ±0.1mm per meter. The conveyor is full. The length of the long center of the rack must not exceed 35mm. After all the single sections are installed and aligned, the blocks can be connected. Check the alignment of the centerline of the rack at the offset position and make adjustments accordingly.


Roller sticky material

The materials transported by the conveyor belt are often sticky, such as coal, mud, and powdery materials. After the normal completion of the material unloading, a small amount of material will adhere to the surface of the conveyor belt and cannot be completely disposed of. As the conveyor belt runs for a long time, the more the material accumulates, the more the conveyor belt will run off.


Remove sticky materials in time, install and adjust sweepers with poor cleaning. The sweeper is an important part of the conveyor, and its cleaning effect directly affects the smooth operation of the conveyor system. Therefore, it is especially important to choose a suitable cleaner for the group.


Factors affecting the cleaning effect of the cleaner


1. Cleaner selection error


2. The cleaning device is installed in the wrong position.


3. The cleaning head is not wearable


How to choose the right cleaner


1. Installation position, chute structure


2. Position of the conveyor belt and conveyor rack, position of the pressure roller


3. Conveyor belt speed and conveyor surface condition


4. Connector type, whether it is a two-way running conveyor belt


5. Material type and characteristics, water content, material size, viscosity


Roller does not rotate

The manufacturing quality of the roller is mainly manifested in the insufficient rigidity of the bearing housing, and it is difficult to ensure the assembly precision of the roller, thereby restricting the flexibility of the roller running.


Sealing lubrication and maintenance Due to the harsh working environment, the dust is large, the sealing is not good, the dirt enters the bearing and the roller is not flexible; the bearing grease discolors and becomes dry, which does not provide lubrication.


Approach


1. Ensure the specified accuracy requirements in the manufacturing process of the rollers.


2. Improve the sealing lubrication method.


3. The bearing seat adopts the radial ball bearing support and the plastic sealing ring labyrinth sealing structure, which can ensure the reasonable force of the roller when working, and has good dustproof effect, small resistance, convenient assembly and disassembly, easy maintenance, and can effectively reduce The operating cost of the conveyor.

Belt repair site

Roller and conveyor center line are not centered

Self-aligning roller


The self-aligning roller consists of four parts: the idler roller, the vertical roller, the turret and the bearing housing.


The vertical roller is vertically arranged and fixed integrally with the slewing frame, and the turret can be rotated around the center of rotation by the vertical roller. When the conveyor belt is deflected to a certain extent, the conveyor belt will hit the vertical roller on one side and give the vertical roller positive pressure and friction. Under the action of the force, the turret rotates counterclockwise around the center of rotation. Since the idler cannot move axially, the reaction force on the conveyor belt can cause the conveyor belt to reset.


The use of the self-aligning roller to prevent the upper conveyor belt from deviating has a certain effect, but because of the magnitude of the rotational force of the roller about the axis, the running resistance of the roller is not large, and the allowable rotation angle of the turret is only about 10°. And only one self-aligning roller is installed every 10-16 roller sets, so the centering effect is not obvious.


Forward roll


The front tilting roller is to feed the two side rollers of the grooved roller group, and the angle of the front roller is inclined to an angle of 1.3°-1.4°.


Since the axes of the rollers on both sides are no longer perpendicular to the direction of travel of the conveyor belt, an angle of forward tilt creates a force that moves the conveyor belt toward the center. When the conveyor belt is working normally, the lengths of the contact between the rollers on both sides are equal to the length of the conveyor belt, and the frictional force of the conveyor belts to the rollers on both sides is equal. At this time, the component forces of the axial movement of the conveyor belt are equal.

Belt conveyor application

When the conveyor belt is deflected to a certain side, the center line of the conveyor belt does not coincide with the center line of the conveyor, and the length of contact between the idler and the conveyor belt changes. Assuming that the side of the A roller is deflected, the contact length of the conveyor belt with the A roller will increase, and the frictional force will increase. The length of contact between the idler B and the conveyor belt is reduced, and the frictional force is correspondingly reduced. Since the force of the belt is the difference between the two sides of the force, the absolute value is small, in order to enable the conveyor belt to maintain a balanced movement in the middle position, all the rollers on both sides should be tilted forward by 1. 3 ° -1.4 ° Increase its running resistance.


Measures to prevent the deviation of the lower conveyor belt


Mainly adopting the lowering of the heart roller and the V-shaped lower roller, the working principle of lowering the heart roller is the same as that of the upper roller. The V-shaped lower idler is composed of a roller and a roller frame. When the conveyor belt is working normally, the conveyor belt center line and the conveyor center coincident conveyor belt are balanced in the middle position. When the conveyor belt runs off to one side, it is assumed that the two-side idler roller is turned to the right side, and the center of gravity of the conveyor belt is changed, and the contact length of the conveyor belt on the offset side is lengthened. The weight is increased. The conveyor belt contact length on the other side reduces the weight and the belt moves to the intermediate position until it is balanced under the force.


It can be seen from the above analysis that the use of the idler roller to prevent the deviation of the conveyor belt has a certain effect, but it needs further discussion in terms of its structural type or use effect.

Belt conveyor application scenario