Belt line deviation causes and treatment methods
1, the reasons for belt deviation:
Belt transport line running belt deviation is the most common fault, belt deviation caused by light scattering material, belts wear; heavy due to severe friction between the belt and the chassis caused by belt softening, burning or even cause a fire, resulting in the entire production line discontinued , Therefore, properly handle the belt deviation related to the normal operation of the entire production system. So my company analyzed some reasons for belt deviation, combined with the operation of the belt to find out the common method of dealing with the deviation of the belt to effectively solve the phenomenon of belt deviation, making the belt conveyor line to smooth production services.
1.1 installation caused by the belt deviation:
The quality of the belt to install the belt on the deviation of the greatest impact on the deviation caused by the installation of the most difficult belt deviation, the installation error is mainly:
1.1.1 Conveyor belt joints are not straight. Resulting in uneven tension on both sides of the belt, the belt has to go big side of the tension deviation, in this case, by adjusting the drive roller or to the drum on both sides of the tension to eliminate, to adjust but must be right Belt connector reconnection;
1.1.2 Rack skewed. Rack skew including rack centerline skew and the rack on both sides of the high and low tilt, both cases will cause serious deviation, found that the belt centerline skew, you must re-tail after alignment, align the middle part, and the rack pair Correct the angle to correct the problem.
1.1.3 Both sides of the guide force uneven. As the guide force uneven, resulting in running resistance on both sides of the belt is inconsistent, causing the belt deviation, the handling of this situation is relatively easy, as long as the re-adjustment of the force on both sides of the guide can be.
1.2 running belt caused by deviation:
1.2.1 roller, roller sticky material caused by deviation: belt machine running for a period of time, the transmission of materials or dust will stick to the roller and roller, making the roller or roller partial diameter increases unevenly, causing Uneven tension on both sides of the belt, resulting in belt deviation.
1.2.2 Belt relaxation caused by deviation. Adjust the good belt after running for a period of time, as the belt stretch permanent deformation or aging, will make the belt tension decreased, causing the belt loose, causing the belt deviation.
1.2.3 uneven distribution of materials caused by deviation. If the belt idling without deviation, heavy running deviation, indicating uneven distribution of materials on both sides of the belt. Uneven distribution of materials is mainly due to the direction and location of the material drop is not correct, if the material is deviated to the left, the belt deviation to the right; and vice versa.
1.2.4 run-time deviation caused by vibration. Belt machine in the operation of the mechanical vibration is inevitable, the faster the belt running speed, the greater the vibration, resulting in greater belt deviation. In the belt machine, the roller vibration caused by the radial runout on the belt deviation most affected.
2, Belt conveyor belt deviation treatment method
For the deviation of the belt machine, we have taken corresponding measures to be adjusted: the error caused by the installation of deviation, the first to eliminate the installation error, the reconnection of the belt joint reconnection, serious skew on the rack must be re- Installation; running deviation, our main adjustment methods are:
2.1 adjust the roller group. Belt conveyor belts in the belt conveyor in the middle of deviation, we have to adjust the position of the roller group to adjust the deviation, roller holder mounting holes on both sides of the hole processing is easy to adjust. Adjustment method shown in Figure 1, the specific method is which side of the belt bias, which side of the roller group toward the belt running forward, or the other side of the shift. As shown in FIG. 1, the belt is deviated in the downward direction, the upper position of the idler roller group should move to the left and the lower position of the idler roller group should move to the right. This method eliminates skew due to the rack, uneven mineral distribution, vibration and other belt deviation caused.
2.2 Install automatic self-aligning roller group. Automatic self-aligning roller group generally every 6-10 group to install a group, its working principle is to use the block or roller in the horizontal direction of the rotation stop or produce lateral thrust to the belt automatically to the heart, to adjust the belt deviation purposes. This method can prevent belt deviation caused by various reasons, but sometimes the effect is not very good.
2.3 using a new type of roller to prevent deviation. Our belt conveyor is mainly TD75-type and Japan belt standard, we know that in the national new standard DT Ⅱ type, the bearing roller group has a forward-tilting type structure, the no-load roller group has a V-shaped structure, these two Belt roller group to prevent the belt deviation has a good effect, we will introduce the structure of the existing belt machine in use, to prevent belt deviation played a good role.
2.4 Adjust the drive roller and the steering roller position. The adjustment of the drive roller and the change roller is an important part of the belt deviation adjustment. Because a belt conveyor has at least 2 to 5 rollers, all rollers must be mounted perpendicular to the centerline of the length of the belt conveyor and must deflect if the deflection is excessive. For the head drum, such as belt to the right side of the drum deviation, the right bearing should move forward, the belt to the left of the drum deviation, the left bearing should move forward, the corresponding may Move the left bearing back or the right bearing back. Tail roller adjustment method with the head drum exactly the opposite. Adjustment method shown in Figure 2. As the drive roller adjustment distance is limited (10-30mm), under normal circumstances, we will adjust the drive roller axis perpendicular to the length of the belt machine, mainly by the screw tension device or weight tightening device to adjust the tail change To the position of the roller bearing, to go through repeated adjustments until the belt transferred to a more ideal position. This method can effectively eliminate the belt slack, rack skew caused by belt deviation.
2.5 tension adjustment. Belt tension adjustment is belt conveyor deviation adjustment is a very important part. The upper part of the heavy hammer tensioning cylinder in addition to the two should be perpendicular to the longitudinal direction of the belt should be perpendicular to the vertical gravity, that is, to ensure that the level of its axis centerline. When using a helical tensioning or hydraulic cylinder tensioning, both housings of the tensioning cylinder should be translated simultaneously to ensure that the cylinder axis is perpendicular to the longitudinal direction of the belt. Specific belt deviation adjustment method is similar to the adjustment at the drum. The method can effectively eliminate belt slack, rack skew caused by belt deviation.
2.6 bi-directional belt conveyor deviation adjustment. Two-way belt conveyor Belt deviation adjustment One-way belt conveyor deviation adjustment is relatively more difficult, in the specific adjustment we have taken to adjust one direction, and then adjust the other way. In the adjustment is also carefully observed the relationship between the direction of movement of the belt and deviation trend, one by one adjustment. Focus on the drive roller and the steering roller to adjust, followed by roller adjustment and material blanking point adjustment.
In short, the deviation of belt conveyor phenomenon, as long as we strengthen the daily inspection, timely removal of the belt caused by a variety of factors.