Explanation of Regulations and Methods for Electronic Belt Scale Calibration

An electronic belt scale is a widely used dynamic weighing device for bulk materials in industrial settings. It is installed on belt conveyors, offering easy installation without the need to modify existing equipment; high efficiency without interrupting conveyor operation; and broad adaptability with no restrictions on the volume or density of conveyed materials, operating over a wide measurement range.

However, electronic belt scales have limitations in measurement accuracy, which can be affected by factors such as the conveyor and environment. To maintain accuracy, regular and precise calibration is essential.

Calibration of electronic belt scales is necessary during installation, debugging, and ongoing use. However, calibration is not a task that can be performed casually; it follows strict regulations and methods.

Guonuo, a professional manufacturer of electronic belt scales, also provides corresponding calibration devices and offers on-site installation, debugging services, and user training. Based on Guonuo's extensive experience and relevant materials, here is a brief explanation of some regulations and methods for belt scale calibration.

Regulations for Electronic Belt Scale Calibration

1. Preparation Before Calibration

   - Carefully inspect the area beneath the weighing bridge's idler supports and the belt support frame for any accumulated material. If found, clean it up promptly.

   - Turn on the belt scale controller (instrument) and verify the parameter settings against the parameter table, including belt length, full-circle time, operating speed, zero point, and coefficient. Once all parameters are correct, proceed with calibration.

2. Zero-Point Calibration

   - Start the belt locally and allow the empty belt to run for 5-10 minutes, completing at least one full revolution.

   - Begin calibration once the belt operates stably.

   - Access the "Zero-Point Calibration" interface on the belt scale controller.

   - During calibration, avoid touching the belt scale frame or sensors.

   - After the zero-point calibration countdown reaches zero, compare the zero-point parameters with those before calibration. Perform three consecutive calibrations, ensuring each result falls within the specified range and the errors are consistent. Use the parameters from the last calibration if they meet the criteria and record the details.

Methods for Electronic Belt Scale Calibration

1. Hanging Weight Calibration

   - Hanging weight calibration is a traditional method that is simple to operate but offers relatively low accuracy. It is rarely used now unless high precision is not required.

2. Material Calibration

   - Material calibration compares the actual material flow with the weight displayed by the belt scale. It can be performed offline or online. Offline material calibration involves comparing the belt scale's measurement with a static weighing device's measurement by collecting material weighed by the belt scale and weighing it again on a static scale, then correcting the belt scale's measurement error.

Although highly accurate, this method is cumbersome and may not meet calibration needs in many situations. Online material calibration uses a set of material testing equipment as a control scale for calibration, which is costly but simple to operate.

3. Chain Code Calibration

   - Chain code calibration uses chain code blocks to simulate material flow for calibrating the belt scale. It offers higher accuracy than hanging weight calibration and is simple to operate, making it a commonly used method. The steps for chain code calibration include:

     - Perform zero-point calibration as described above.

     - After zero-point calibration, turn off the belt conveyor switch and verify the emergency stop switch.

     - Before calibration, check that the chain code is undamaged and functions properly for winding and unwinding. Ensure the guide wheels do not exceed the limit when lowering the chain code, and the circulating chain code should be positioned in the middle of the belt.

     - Inspect the speed-measuring roller for proper operation, lubricate the bearing seats at both ends, and ensure the bearings are intact.

     - Start the belt and observe for any belt deviation. After 5 minutes of stable operation with no material falling onto the belt, begin calibration.

     - Access the chain code calibration interface on the belt scale controller and initiate chain code calibration.

     - Each full revolution of the belt constitutes one calibration cycle. Observe the chain code's rotation on the belt during calibration and stop the belt immediately if any abnormalities occur. Avoid touching the belt scale frame or sensors during calibration.

     - After completing one calibration, calculate the error rate. If the error falls within the acceptable range, perform another calibration to confirm stability. If the error exceeds the range, recalibrate and perform the test again until the calibration results meet the specified range. Record the parameters in detail for each calibration.