In coal mining, thermal power plants, and coal washing plants, fully suspended belt scales are a common new type of high-precision dynamic measuring equipment, mainly used to measure the flow rate of coal transported by belt conveyors. They have the characteristics of high accuracy, high stability, long durability, and good applicability.
The coal conveying system requires high accuracy for belt scales, so fully suspended belt scales are commonly used. So what is a fully suspended belt scale and why can it achieve high accuracy?
The scale frame structure used in the fully suspended belt scale is different from the mechanical lever transmission form. The fully suspended multi roller scale frame, with the special connection method of high-precision sensors, suspends the weighing frame in the space of the belt conveyor, removing the components of the lever type force transmission structure, thereby eliminating the error faults caused by the lever type force transmission structure and improving the accuracy and stability of the belt scale.
In addition, the fully suspended belt scale is equipped with multiple weighing sensors in parallel, which can improve the accuracy of the entire scale frame by an order of magnitude. In addition, under the same conditions such as material flow rate, roller spacing, and belt speed, the effective value of the fully suspended multi roller scale frame is greater than that of the double bar multi roller scale, further improving the accuracy of the fully suspended belt scale.
How to improve the accuracy of the fully suspended belt scale in coal conveying systems in practical applications?
The accuracy that can be achieved by the weighing sensor, instrument, and scale frame structure has been determined at the time of leaving the factory. In the actual process, improving the accuracy of the fully suspended belt scale can be achieved through the influence of the conveyor belt, linearization, and external environment.
1. The conveyor for installing a fully suspended belt scale must meet the requirements in order to solve the impact of the conveyor belt on the belt scale
(1) The rigidity of the conveyor structure frame is good;
(2) The better the inclination angle of the conveyor, the smoother it should be;
(3) Configure a heavy hammer automatic tensioning device to maintain a constant belt tension and avoid the impact of belt tension changes on measurement.
2. Select and install the fully suspended belt scale in the correct position
Stay away from the dropping point, avoid positions with large curvature, and stay away from the driving device.
3. The weighing section roller on the scale body should be installed according to the requirements
(1) The weighing roller should be 6mm higher than other rollers on the conveyor
(2) The spacing error between weighing rollers should be less than 1mm
(3) The height error between the weighing rollers should be less than 1mm.
(4) The radial and axial errors of the weighing roller should be less than 0.5mm.
4. Addressing the impact of external environmental changes on the accuracy of fully suspended belt scales
Regularly calibrate the fully suspended belt scale, including zero calibration and interval calibration.
5. Carry out daily inspections and maintenance
(1) Before starting up, the fully suspended belt scale should be cleaned, especially near the weighing sensor, to ensure that there are no foreign objects blocking, the scale body is clean, and there is no coal or dust accumulation.
(2) Check if the connecting joint between the speed sensor and the speed roller is loose, and if the connecting bolts are loose or detached. If there is any looseness, tighten them in a timely manner.
(3) Check whether the three sets of rollers in front and behind the scale body are damaged, and whether the conveyor belt and structural frame are damaged or deformed.
(4) After starting up, check whether the conveyor belt is off track, whether the weighing roller is running smoothly, and whether the instrument display is normal.
(5) Regularly lubricate and maintain the speed measuring roller bearing seat and supporting roller.
The above is a summary of Guonuo Technology's experience and technical knowledge based on the case of a fully suspended belt scale, for your reference. Guonuo Technology provides on-site installation and commissioning services for fully suspended belt scales, ensuring that the scales can be installed correctly. At the same time, we provide training on how to operate, calibrate, and maintain the scales, enabling customers to use and maintain them correctly.
