Teflon conveyor belt Introduction to the causes of deviation of:
When the belt conveyor is running Conveyor belt Deviation is one of the most common faults. There are many reasons for deviation. The main reasons are low installation accuracy and poor daily maintenance. During installation, the head and tail rollers and the intermediate idler rollers shall be on the same centerline as far as possible and parallel to each other to ensure that the conveyor belt is not biased or slightly biased. In addition, the belt joint should be correct and the perimeter of both sides should be the same.
Handling method:
In the process of use, if there is deviation, the following inspection shall be carried out to determine the cause and make adjustment. The frequently inspected parts and treatment methods of conveyor belt deviation are as follows:
(1) Check the misalignment between the transverse centerline of the idler and the longitudinal centerline of the belt conveyor. If the misalignment exceeds 3mm, it should be adjusted by using the long mounting holes on both sides of the idler group. The specific method is to which side the conveyor belt is biased, which side of the idler group moves forward in the direction of the conveyor belt, or the other side moves backward.
(2) Check the deviation value of the two planes of the head and tail frame mounting bearing block. If the deviation of two planes is greater than 1mm, the two planes shall be adjusted in the same plane. The adjustment method of the head drum is: if the conveyor belt deviates to the right side of the drum, the bearing seat on the right side of the drum should move forward or the left bearing seat should move backward; If the conveyor belt deviates to the left side of the roller, the bearing seat on the left side of the roller should move forward or the bearing seat on the right side should move backward. The adjustment method of the tail drum is just opposite to that of the head drum.
(3) Check the position of the material on the conveyor belt. The material is not centered on the cross section of the conveyor belt, which will lead to the deviation of the conveyor belt.
If the material deflects to the right, the belt will deflect to the left, and vice versa. The materials shall be centered as far as possible during use. In order to reduce or avoid the deviation of such conveyor belt, a baffle plate can be added to change the direction and position of materials.
debugging
Teflon conveyor belt It is the key equipment of the conveying system, and its safe and stable operation directly affects production operations. Belt deviation is the most common fault of belt conveyor, and timely and accurate treatment is the guarantee of its safe and stable operation. There are many phenomena and causes of deviation, and different adjustment methods should be taken according to different phenomena and causes of deviation to effectively solve the problem. This article is based on many years of field practice, from the perspective of users, using mechanical principles to analyze and explain the causes of such failures and treatment methods.
1、 The axis of the head drive drum or the tail turn drum is not perpendicular to the center line of the conveyor, causing the conveyor belt to run off at the head drum or the tail turn drum. When the roller deflects, the tightness of the conveyor belt on both sides of the roller is inconsistent, and the traction force Fq along the width direction is also inconsistent, showing an increasing or decreasing trend. This will add a moving force Fy in the decreasing direction to the conveyor belt, causing the conveyor belt to deflect toward the loose side, which is called "loose running without tight running". The adjustment method is as follows: for the head drum, if the conveyor belt deviates to the right side of the drum, the bearing seat on the right side should move forward; if the conveyor belt deviates to the left side of the drum, the bearing seat on the left side should move forward; correspondingly, the left bearing seat or the right bearing seat can also be moved backward. The adjustment method of the tail drum is just opposite to that of the head drum. After repeated adjustment, the conveyor belt is adjusted to a better position. The position of the driving or turning drum shall be installed accurately before adjustment.
2、 The processing error, sticking or uneven wear on the outer surface of the drum cause different diameters, and the conveyor belt will deviate to the side with larger diameter. That is, the so-called "running big, not running small". The stress is shown in Figure 4: the traction force Fq of the conveyor belt generates a moving component Fy to the side with large diameter, and under the action of the component Fy, the conveyor belt shifts. In this case, the solution is to clean up the sticky material on the surface of the drum. If the processing error and uneven wear are found, they should be replaced and re processed for rubber coating.
3、 The dropping position at the transfer point is not as shown in Figure 5, which causes the deviation of the conveyor belt. The dropping position of the material at the transfer point has a great impact on the deviation of the conveyor belt, especially when the projection of the last conveyor and this conveyor is vertical in the horizontal plane. Generally, the relative height of the upper and lower belt conveyors at the transfer point should be considered. The lower the relative height is, the greater the horizontal velocity component of the material is, the greater the lateral impact force Fc on the lower belt is, and the material is difficult to center. The material on the cross section of the conveyor belt is deflected, and the horizontal component force Fy of the impact force Fc will eventually lead to belt deviation. If the material deflects to the right, the belt will deflect to the left, and vice versa.
For the deviation in this case, the relative height of the two conveyors should be increased as much as possible in the design process. The form and size of the upper and lower funnels, guide chute and other parts of the belt conveyor subject to space constraints should be carefully considered. Generally, the width of the guide chute should be about three fifths of the belt width. In order to reduce or avoid belt deviation, a baffle plate can be added to block materials and change the falling direction and position of materials.
4、 The perpendicularity error between the installation position of the bearing idler group and the conveyor center line is large, which causes the conveyor belt to run away from the bearing section. When the Teflon conveyor belt runs forward, it gives the idler a forward traction force Fq, which is divided into the component force Fz that makes the idler rotate and a transverse component force Fc, which makes the idler move axially. Since the fixed idler of the idler bracket cannot move axially, it will inevitably produce a reaction force Fy on the conveyor belt, which makes the conveyor belt move to the other side, This leads to deviation.
It is not difficult to understand the reason for the deviation of the conveyor belt and the adjustment method will be clear if the stress condition of the load carrier roller group when it is installed is clear.
One method is to machine long holes for the mounting holes on both sides of the idler group for adjustment during manufacturing. The specific adjustment method is shown in Figure 2. The specific method is to move the belt to which side, which side of the idler group moves forward in the direction of the belt, or the other side moves backward. As shown in Figure 2, if the belt deviates in the upward direction, the lower position of the idler group should move to the left, and the upper position of the idler group should move to the right.
The second method is to install the centering idler group. There are many types of centering idler groups, such as the middle rotating shaft type, four link type, vertical roller type, etc. Its principle is to use blocking or the idler rotates in the direction of the horizontal plane to block or generate lateral thrust to make the belt automatically centripetal to adjust the belt deviation. Its stress condition is the same as the deflection stress condition of the load carrying idler group. Generally, this method is more reasonable when the total length of belt conveyor is relatively short or the belt conveyor runs in two directions, because the shorter belt conveyor is easier to deviate and is not easy to adjust. The long belt conveyor is better not to use this method, because the use of the centering idler group will have a certain impact on the service life of the conveyor belt.
