Selection and Calibration Methods for Screw Weighing Feeders

In the production processes of industries such as building materials, steel, and cement, as well as in some operational sites requiring material feeding (e.g., quantitatively feeding materials into mixing equipment), automatic metering feeders, namely screw weighing feeders, are frequently utilized.

Due to variations in application industries, material characteristics, and other factors, the requirements for screw weighing feeders differ. Users need to understand certain equipment selection methods. Additionally, mastering calibration techniques is crucial for enhancing the accuracy and maintaining the stable operation of screw weighing feeders.

Methods for Selecting Screw Weighing Feeders:

1. Material Characteristics: Consider the particle size, density, flowability, moisture content, and whether the material generates dust or is corrosive. When selecting equipment, ensure that its material, screw tube, and screw blade designs can accommodate the material characteristics to prevent blockages and ensure uniform and constant feeding.

2. Production and Conveying Capacity: The production capacity of the production line varies, leading to different hourly material flow rates. Consequently, the requirements for the feeder's screw tube diameter, rotational speed, and motor power will also differ.

3. Application Site Conditions and Environment: The distance from the drop point to the discharge outlet in the production site determines the feeder's length (center distance) and affects motor configuration. The available installation space determines the equipment's adaptability, such as whether a tilt angle is necessary.

4. Metering and Feeding Accuracy Requirements: Different production activities have varying accuracy requirements. For instance, feeders used for production control demand higher accuracy, while those for conveying low-value materials or estimating basic feeding amounts may require lower accuracy. Additionally, the installation space environment, material characteristics, and feeding accuracy requirements influence the feeder's structural configuration, such as whether to use a single-tube or double-tube screw. Space availability and high accuracy requirements may justify considering a double-tube screw.

5. Brand and After-Sales Service: Consider whether the feeder manufacturer has a factory and can provide comprehensive after-sales services, including installation, debugging, and warranty periods.

Methods for Calibrating Screw Weighing Feeders:

After selecting a high-quality and suitable screw feeder, proper calibration during subsequent use is essential:

1. Pre-Calibration Preparations: Prepare necessary tools such as standard weights for calibration. Check the installation, wiring, and sensor installation. Clean and preheat the feeder to ensure it is in optimal condition.

2. Calibration Steps:

   - (1) Turn on the power and open the display screen, adjusting the equipment to its normal production state.

   - (2) Preheat the feeder to its working temperature and maintain it for a period to ensure stability.

   - (3) Manually or via a belt conveyor, place the material into a temporary storage bin. Position a receiving hopper below the screw feeder's discharge outlet.

   - (4) Set the equipment control system to automatic control and start the impeller feeder and screw feeder.

   - (5) Observe the display values. Once stable, turn off the impeller feeder and screw feeder.

   - (6) Record the coefficient and mass values displayed on the weighing scale and calculate the adjustment coefficient.

   - (7) Make adjustments based on the calculation results and repeat the above steps until the cumulative error is acceptable.

For specific selection of screw weighing feeders, customers can inform Guonuo Technology of their specific needs, installation environment, and parameters, and Guonuo Technology will provide a detailed product solution free of charge. Regarding equipment installation and debugging, Guonuo Technology will dispatch specialized personnel to conduct on-site installation and debugging, followed by training for on-site personnel on equipment operation, usage, and calibration methods.