The encoded variable frequency belt scale places two sets of belt-carrying idlers on the lever-type weighing bridge frame. The weighing module detects the weight of the material on the belt and inputs it into the accumulator. The speed sensor detects the belt speed and inputs the speed information into the accumulator. The integrator processes the received speed signal and weight signal to obtain the cumulative quantity and time-of-use flow rate of the material. The belt conveyor conveys materials from the feeding bin or other feeding equipment and passes them through the weighing module bridge frame for weight detection. Meanwhile, the speed sensor installed on the tail wheel detects the speed of the belt. The detected weight signal and speed signal are sent to the integrator for calculus processing and display the instantaneous flow rate in th and the cumulative quantity in tons. The internal regulator compares the measured instantaneous flow signal value with the set flow value from the industrial control computer through the communication board, and outputs the corresponding signal value according to the deviation. The speed of the motor is changed by the frequency converter to adjust the feeding amount to be consistent with the set value, thereby achieving the control of a constant feeding flow. The cumulative quantity signal is sent to the industrial control computer to achieve the function of stopping the machine when the set total feeding amount reaches the standard. The measurement of the conveyor is all carried out in a sturdy and pressure-resistant chamber. A scraper cleaning device is installed at the lower part of the conveyor metering, which can clear the spilled materials and fly ash to the discharge port. The entire system is equipped with belt deviation alarm, material blockage alarm and chain breakage alarm.

The shell of the weighing belt conveyor is a sealed trough made by welding steel plates together. At both ends and on the sides, there are well-sealed movable doors that are convenient for installation and maintenance. All the components for conveying and metering are fixed on the two side walls of the tank, which ensures good overall rigidity and is conducive to metering. The weighing module bridge frame adopts the N3B type fully suspended structure. The measurement module features high precision, good stability and excellent temperature compensation. The scale body does not require maintenance. There is no material accumulation on the scale frame, and the possibility of zero drift caused by this no longer exists. The head and tail are equipped with head cleaners and internal cleaners, which can remove the powder adhering to the inside and outside of the belt, avoiding repeated metering of materials and belt deviation caused by powder adhesion surfaces. The scraper of the head cleaner is made of high-molecular polyethylene plate, and the scraper of the internal cleaner is made of rubber plate. In the trough body of the courtyard, there is also a chain-driven scraper cleaning device. The scraper cleaning can be used to clean fly ash and scattered materials. The belt conveyor casing is equipped with observation Windows on all four sides and a lighting lamp on the top. The operation of the belt scale can be observed at any time without opening the door or stopping the operation of the Feeder. The main drive and the cleaning scraper drive adopt the shaft-type anti-freezing machine, which has a compact structure, limited capacity and low maintenance.