How to debug and maintain the electronic belt scale in the coal conveying system?

Electronic belt scales are widely and importantly used in coal conveying systems of coal mines or thermal power plants, providing users with accurate and real-time production data. However, the environment of the coal conveying system is complex, and the conditions of the conveyor are more complicated than those in ordinary environments, which have significant impacts on the operation of electronic belt scales. To ensure the measurement accuracy and stability of electronic belt scales for coal conveying, it is essential to carry out debugging and maintenance work. Based on numerous practical applications of coal conveying belt scales and relevant data, Guonuo has summarized some points for attention in debugging and maintaining coal conveying belt scales for your reference.

1. Debugging of Electronic Belt Scales for Coal Conveying

Debugging of belt scales mainly includes zero adjustment and calibration:

(1) Zero Adjustment

①Before zero adjustment, ensure that there is no material flow on the belt and that the belt conveyor operates empty for about half an hour.

②Press the zero adjustment function in the instrument, and the instrument internally tests the tare weight on the weight sensor according to the established program. Read the new zero value from the display until it reaches the error range, and then the zero adjustment is completed.

(2) Calibration

Taking physical calibration as an example:

①Under no-load conditions, perform zero adjustment twice to ensure that the zero position errors of the two adjustments are within the specified range.

②Select physical verification in the instrument, and discharge material at a normal discharge speed to ensure sufficient material passes over the belt scale.

③After the material is completely discharged, record the material quantity that has just passed as displayed on the instrument, and compare it with the actual material quantity to confirm the new physical calibration coefficient. Then, the belt scale can enter normal operation.

2. Maintenance of Electronic Belt Scales for Coal Conveying

In practical applications, besides factors such as quality, performance, and installation, maintenance also has a significant impact on electronic belt scales, especially for those used in coal conveying due to environmental and working conditions. They require proper and reasonable maintenance.

(1) Keep the belt surface clean and regularly remove dust, especially the material accumulated on the weighing bridge, weighing idlers, and speed measuring rollers.

(2) As the flexibility of weighing idler movement and radial runout directly affect measurement accuracy, lubricate the weighing idlers once or twice a year. After lubrication, recalibrate the belt scale.

(3) During operation, ensure that the belt runs along the centerline of the conveyor. If there is deviation, adjust it using the deviation correction idlers to ensure normal operation of the belt in the scale area.

(4) Maintain a constant belt tension by installing a tensioning device. If there is no tensioning device, recalibrate the belt scale after adjusting the belt tension.

(5) Transport material according to the specified load capacity of the sensor. Too low a load will affect measurement accuracy, while too high a load may damage the weighing sensor.

(6) Do not perform welding operations on the scale body where the sensor is installed, as it may damage the sensor. In special cases, disconnect the power supply and connect the grounding wire to the scale body. Do not allow the current circuit to pass through the sensor.

(7) Weekly inspect the belt scale junction box, cables, terminals, display instruments, etc.