Weighing conveyor will pass through the material on the belt, through the weighing scale frame under the load cell to detect the weight, the feeding controller will be the flow and set the flow rate for comparison, the output signal from the controller to control the frequency converter speed regulation, to achieve the requirements of quantitative feeding. It is an automatic scale that continuously weighs the bulk material on the conveyor belt without the need to subdivide the mass or interrupt the movement of the conveyor belt.

Weighing conveyor is from the weight of the material on the belt, the weighing signal and the speed signal of the belt running together transmitted to the microprocessor weighing controller, automatically calculate the instantaneous flow of the material. By continuously comparing the set flow rate and the actual flow rate, the speed of the belt is adjusted so that the actual material flow rate is kept at the set flow rate value.

Belt scale is composed of four parts, such as weighing frame, weighing sensor, velocity sensor and display instrument. The weighing instrument integrates the speed signal and the weighing signal to obtain the instantaneous flow rate and the cumulative amount. The speed sensor is directly connected to the large diameter speed measuring drum and provides a series of pulses, each representing a belt movement unit, and the frequency of the pulse is proportional to the belt speed. The weighing instrument receives signals from the weighing sensor and the speed sensor, and obtains an instantaneous flow value and cumulative weight value through integral calculation, and displays them respectively.

The construction of an electronic belt scale consists of a bracket and a belt, which is attached to the bracket at each end. When an object is placed on the electronic belt, the object exerts a force vector onto the belt, and the belt is tensioned as a result. The belt sends out an electronic signal with a frequency related to the degree of tension. When the belt is stressed, the electronic components inside will determine the weight of the object through the output signal of the pressure sensor through the computer processing system.

The electronic belt scale transmits the weight signal of the material on the belt and the speed signal of the belt to the on-site totalizer through the front channel weighing equipment and the rear channel weighing equipment installed on the conveyor. Inside the on-site totalizer, the weight signal is converted to a digital quantity by AD and transformed into a weight value by the built-in microcontroller; the speed pulse is transformed into a speed value by the built-in microcontroller and multiplied by the weight value to obtain the instantaneous flow rate; the two channels accumulate the instantaneous flow rate at the same time to obtain the totalized amount of the material in the two channels respectively, which is saved in the internal non-volatile memory. When the two channels are normal, the remote display adopts the average value of the accumulated quantity of the two channels, and if one of the channels fails, the normal one will be displayed.

The load cell commonly used in electronic belt scales consists of a load cell bracket that contains a load cell that can detect tension, a load cell bracket that can vary the degree of tension, and a load cell pressure device that can detect variations in the degree of tension. These three components reflect the magnitude of the belt's tension and convert them into an electronic signal output.

The belt scale adopts three groups of weighing bridge, one of which is installed at the back of the belt conveyor feeding point, where no material passes through, and can only weigh the tare, which can realize real-time online automatic peeling when conveying materials; The other two groups of scales are installed in the front of the blanking point, and weigh the material at the same time during the conveying process, and compare and calibrate the material online.

The main control part of automatic belt scale adopts PLO programming controller (PLC), which is composed of CPU module, I/O module, high-speed counting module, AD/DA module and scanner module. It is responsible for the entire digital quantity input and output control and provides the input and output signals required for external connection. It is used for frequency conversion speed regulation control and current instantaneous flow output 4-20mA current signal, the speed adjustment signal after computer processing is sent to the inverter by NI04I, and the encoded pulse from the speed encoder is sent to the high-speed counter by PLC calculation to obtain the running speed of the belt.

Automatic Belt Scale is an example of a belt scale with a fully suspended weigh frame formed by the support of four load cells, which are divided into four independent signals into the field digital converter. The belt is used for continuous feeding during the feeding process and the feeder delivers the material from the user's silo or other feeder and weighs it through the weigh bridge.