Technical Measures to Improve the Accuracy and Stability of Roller-type Electronic Belt Scales in Practical Applications

In industries such as building materials, mining, coal, and cement, belt conveyors are commonly used for material transportation. The belt of the belt conveyor is supported and operated by rollers. To measure the weight of the material during transportation, the characteristics of roller-supported belt scales can be utilized, and roller-type electronic belt scales can be employed for dynamic continuous weighing. During the transportation process of the belt conveyor, the belt carries the material through the weighing section of the scale frame with a constant tension and uniform speed. The weighing rollers transmit the weight of the material to the weight sensors, which release weight signals. Simultaneously, the speed sensor releases belt speed signals. The belt scale weighing instrument receives both the weight and speed signals, processes them, and displays the final instantaneous flow rate and cumulative flow.

From the concept of roller-type electronic belt scales, it is evident that their measurement accuracy directly stems from the weight sensors and speed sensors. The data from these sensors, in turn, originate from the force transmission of the scale body structure and the belt speed. The instrument serves as the core for data reception and processing. Therefore, technically speaking, to enhance the measurement accuracy and stability of roller-type belt scales in practical applications, it is crucial to ensure accurate force transmission of the scale frame structure, accurate reception and transmission of weight and speed signals, and real-time accuracy of instrument calculations.

(1) Scale Frame Structure

The scale frame structure constitutes the force transmission framework of the belt scale. To improve measurement accuracy, force loss should be minimized, with fewer intermediate force transmission links being preferable. Additionally, the scale frame structure impacts the transportation, installation, and maintenance of the belt scale. Larger and more complex scale frame structures result in higher transportation costs, inconvenient installation, spatial limitations, and increased maintenance workload.

Therefore, the overall structural design of the scale frame should be simple and compact, facilitating transportation and installation. A scale frame with better resistance to off-center loads ensures more accurate force transmission, sturdier load-bearing, and stronger impact resistance, thereby maintaining stable measurement and reducing the risk of damage. Fewer mechanical structures and components in the belt scale body lead to reduced friction, smaller horizontal surfaces, not only improving measurement accuracy but also significantly reducing routine maintenance.

(2) Weight Sensors

Weight sensors are the direct source of weight signals. Therefore, to enhance measurement accuracy in practical applications, the accuracy and stability of weight signals must be ensured. Sensor signals are divided into analog and digital signals, with the latter exhibiting better anti-interference capabilities. Apart from the signal mode, weight sensors must possess characteristics such as high sensitivity, high resolution, high impedance, and good fatigue resistance. Otherwise, they may be easily affected by environmental factors during practical use, resulting in low and unstable accuracy.

(3) Speed Sensors

Like weight sensors, speed sensors must ensure the accuracy of speed signals and adopt digital signals. Speed sensors roll with the movement of the belt to obtain the belt speed. To improve speed measurement accuracy, stability during operation is crucial, avoiding jumping, slipping, and ensuring flexible rotation. Sensor rollers should be made of wear-resistant materials to ensure sufficient friction between the friction wheel and the belt, enabling pure rolling without slipping and ensuring the accuracy of speed signals.

(4) Instruments

Instruments serve as the core for data processing in belt scales, assisting in improving measurement accuracy and stability through functions such as self-diagnosis, self-alarm, temperature compensation, simulated calibration, breakpoint protection, and automatic zero calibration. Although these functions do not directly provide measurement data, the absence of them would significantly increase the susceptibility of belt scales to environmental factors.

In summary, for roller-type electronic belt scales, the design structure, components, and overall performance are the foundations for improving measurement accuracy.