Belt conveyors have a wide range of applications, suitable for various industries. To ensure the belt conveyor works optimally, we must address malfunctions, paying attention to installation dimensional accuracy and routine maintenance. Xinshengrun explains the causes of belt conveyor misalignment, and we need to handle each cause differently.

1. Adjusting the Load-Bearing Idler Assembly: When the belt of a belt conveyor deviates from its normal position in the middle of the conveyor, the position of the idler assembly can be adjusted to correct the deviation. During manufacturing, the mounting holes on both sides of the idler assembly are machined into elongated holes for adjustment. The specific adjustment method is to move the idler assembly forward in the direction the belt is deviating, or backward on the opposite side. If the belt deviates upward, the lower part of the idler assembly should be moved to the left, and the upper part to the right.

2. Installing Self-Aligning Idler Assemblies: Self-aligning idler assemblies come in various types, such as the center-shaft type, four-link type, and vertical roller type. Their principle is to use obstruction or the rotation of the idler in the horizontal plane to block or generate lateral thrust, causing the belt to automatically center itself, thus correcting belt deviation. This method is generally more reasonable when the total length of the belt conveyor is relatively short or when the belt conveyor is running in both directions, because shorter belt conveyors are more prone to deviation and are more difficult to adjust. This method is not used for long belt conveyors because the use of self-aligning idler assemblies can negatively impact the service life of the belt.

3. Adjusting the position of the drive and idler rollers: Adjusting the drive and idler rollers is a crucial step in correcting belt misalignment. Since a belt conveyor has 2 to 5 rollers, all rollers must be installed perpendicular to the centerline along the length of the conveyor. Excessive misalignment will inevitably cause belt deviation. The adjustment method is similar to that of the idler roller assembly. For the head roller, if the belt deviates to the right, the right bearing housing should be moved forward; if it deviates to the left, the left bearing housing should be moved forward. Correspondingly, the left or right bearing housing can also be moved backward. The adjustment method for the tail roller is exactly the opposite of the head roller. Adjustments should be made repeatedly until the belt is in a relatively ideal position. Accurately install the drive or idler rollers before adjusting them.

4. Tensioner Adjustment: Adjusting the belt tensioner is a crucial step in correcting belt conveyor misalignment. The two redirecting rollers at the top of the counterweight tensioner should be perpendicular not only to the length of the belt but also to the vertical line of gravity, ensuring their center lines are horizontal. When using screw tensioning or hydraulic cylinder tensioning, the two bearing seats of the tensioning roller should move simultaneously to ensure the roller axis is perpendicular to the longitudinal direction of the belt. The specific method for adjusting belt misalignment is similar to that for the rollers.

5. Influence of Material Drop Position at Transfer Points on Belt Misalignment: The material drop position at transfer points has a significant impact on belt misalignment, especially when the projections of the two belt conveyors on the horizontal plane are perpendicular. The relative height of the upper and lower belt conveyors at the transfer point should generally be considered. The lower the relative height, the greater the horizontal velocity component of the material, resulting in a greater lateral impact on the lower belt, and making it difficult for the material to be centered. This causes the material to deviate on the belt cross-section, leading to belt misalignment. If the material deviates to the right, the belt will deviate to the left, and vice versa. During the design process, the relative height between the two belt conveyors should be maximized as much as possible. The form and dimensions of components such as upper and lower hoppers and guide chutes in mobile bulk material conveying machinery with limited space should be carefully considered. Generally, the width of the guide chute should be about two-thirds of the belt width. To reduce or avoid belt misalignment, baffles can be added to block the material and change its falling direction and position.

6. Adjustment of Misalignment in Bidirectional Belt Conveyors: Adjusting belt misalignment in bidirectional belt conveyors is much more difficult than adjusting it in unidirectional belt conveyors. In specific adjustments, one direction should be adjusted first, then the other. Careful observation of the relationship between the belt’s movement direction and the misalignment trend is necessary, and adjustments should be made one by one. The adjustment should focus on the drive roller and idler roller, followed by the idler rollers and the material drop point. Simultaneously, attention should be paid to ensuring uniform force along the belt’s cross-sectional length when the belt is vulcanized, and the force on both sides should be as equal as possible when using a guide chain traction.