The main control component of the belt scale is composed of CPU module, I/O module, high-speed counting module, AD/DA module and scanner module, which is responsible for the digital measurement and output control of the whole belt scale and provides the input and output signals required for external connection. Two 16-bit analog inputs and two analog output modules NI04I A/D for weight sampling, D/A for frequency control and current instantaneous flow output 4-20mA current signal. The weight signal is converted into 4-20mA current signal by the transmitter and sent to NI04I, and the speed adjustment signal after computer processing is sent to the inverter by NI04I, and the coded pulse from the speed encoder is sent to the high-speed counter and calculated by PLC to obtain the running speed of the belt.
020-34563445The belt scale is operated by placing two sets of belt carrying rollers on a lever type weighing bridge, detecting the weight of the material on the belt with the help of a weighing module and inputting it into the accumulator, the speed sensor detects the speed of the belt and inputs the speed information into the accumulator. The speed sensor detects the speed of the belt and inputs the speed information into the totalizer. The totalizer processes the received speed and weight signals to get the cumulative amount of material and the time flow. The belt conveyor conveys the material from the feed bin or other feeding equipment and passes through the weighing module bridge for weight detection, while the speed sensor installed in the tail wheel detects the speed of the belt, and the detected weight and speed signals are sent to the accumulator for calculus processing and displaying the instantaneous flow rate and cumulative volume in th and tons. The internal regulator compares the measured instantaneous flow rate signal value with the set flow rate value from the industrial control machine through the communication board, and outputs the corresponding signal value according to the deviation size, and changes the speed of the motor through the frequency converter in order to change the feeding volume to be consistent with the set value, thus completing the control of constant feeding flow rate. The accumulated quantity signal is sent to the industrial control machine.
The shell of the weighing belt conveyor is a sealed groove body welded by steel plate, with well-sealed movable doors at both ends and sides, which is convenient for installation and overhauling. Conveying and metering components are fixed on both sides of the trough wall, the overall rigidity is good, and is conducive to metering. The weighing module bridge is fully suspended with N3B type structure, the measuring module has high precision, good stability performance and good temperature compensation. The scale does not require maintenance. There is no accumulation of material in the weighing frame, so that the possibility of zero point drift no longer exists. The head and tail sections are equipped with a head cleaner and an internal cleaner, which are able to clean off the powder adhering to the belt inside and outside, thus avoiding repeated measurement of the material and belt deflection due to the powder bonding surface. The scraper of the head cleaner is high polymer polyethylene plate, and the scraper of the inner cleaner is rubber plate. There is also a chain-driven scraper sweeping device in the trough of the court section, and the scraper sweeping can be used to clean up fly ash and scattered materials. Belt machine shell around the opening of the observation window, the top is equipped with lighting. The operating conditions in the belt scale can be observed at any time without opening the door or stopping the Feeder. The main drive and sweeping scraper drive adopts the shaft-type freezer reducer, which has a compact structure, a limited number of cases, and a small amount of maintenance.
