Points for Attention in Electronic Belt Scale Installation

Electronic belt scales are used for continuous dynamic weighing of industrial bulk materials. Their operation is greatly affected by the actual site environment, so installation requirements are high. Nowadays, many high-precision electronic belt scales have excellent performance, can be used in various environments, have strong anti-interference capabilities, and can maintain stable operation in various environments. Installation is also very convenient, and requirements have been reduced. However, installation factors cannot be completely disregarded. Even for high-performance, high-precision electronic belt scales, installation remains crucial.

Regarding the installation of electronic belt scales, people may only notice some obvious points, such as installing them away from large machinery to minimize mechanical vibration interference, or installing them on flat ground rather than inclined surfaces. However, the installation of belt scales is a professional task, and there are many easily overlooked points that can significantly impact the subsequent use of the belt scales. Based on engineer input and relevant materials, Guonuo Technology has summarized several points that are often overlooked for reference and discussion.

1. Requirements for Conveyor Support Structures

During the design of the weighing system, the following deflections should be considered: deflection of the load sensors, deflection of the scale frame and weighing bridge system, and deflection of the conveyor support structure. It is extremely important that these deflections are not excessive. In scale manufacturing, the deflections of the load sensors, scale frame, and weighing bridge system are controlled. Only the deflection of the conveyor support structure is a variable. Therefore, the conveyor longitudinal beams supporting the scale and on both sides should have sufficient stiffness and satisfactory support to ensure that the relative deflection between at least the +3 to -3 idler rollers does not exceed 1/200 (e.g., for a 900mm idler spacing, the deflection is ±0.75mm). The conveyor should not have expansion joints or spliced longitudinal beams where the scale is installed.

The installation position of the electronic belt scale should avoid the joints of the conveyor support structure as much as possible. If it is unavoidable, the spliced parts should be welded together to form a whole.

2. Belt Tensioning Device

To ensure the accuracy of the weighing system and reduce the impact of belt tension on the belt scale weighing, belt conveyors longer than 12 meters should have a constant tension or be equipped with a gravity tensioning device.

3. Changes in Belt Trough Shape

To achieve accurate belt weighing, the impact of changes in the belt trough shape along the entire conveying route, from no-load to full-load, should be considered. The belt should have sufficient flexibility to ensure good contact between the belt and all weighing idler rollers during no-load operation. This ensures that the conveyed material is supported by the weighing idler rollers rather than the frame of the belt conveyor.

4. Idler Trough Angle

An excessively large idler trough angle can cause many problems. It not only makes the beam effect or sagging line effect of the belt more pronounced but also increases the impact of idler roller misalignment. During the installation of the weighing system, an important task is to align all the idler rollers in the weighing section into a straight line. This minimizes the additional forces introduced into the weighing system due to changes in belt tension or other external forces when the belt runs above the idler rollers.

5. Weighing Zone Idler Rollers

In general, high-quality idler rollers produced by the manufacturer can be used in the weighing system to meet the requirements. However, the selected idler rollers for the weighing system must have the same dimensions and trough angle as the original idler rollers of the belt conveyor. The selection of idler rollers for the weighing section is particularly important, considering both the type and structure of the idler rollers. Since idler roller alignment plays a crucial role in the operation of the belt scale, the structure of all idler rollers should be as uniform as possible. It is important to avoid using "V"-type idler rollers and suspended idler rollers.

6. Guiding Idler Rollers

Guiding idler rollers, also known as anti-runoff idler rollers, are extremely important for guiding the center of the conveyor belt from no-load to full-load conditions. They can be installed at a distance of 8 idler roller spacings from the weighing zone.

Even for high-performance, high-stability belt scales, proper installation is essential. Guonuo Technology will arrange professional engineers to develop the most reasonable installation plan based on the actual usage environment of the customer to ensure subsequent stable operation.