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.

The belt scale is equipped with a load weighing module bridge, mounted on the longitudinal beam of the conveyor. The weighing rollers on the weighing bridge detect the weight of the material on the belt and produce an electrical output signal proportional to the belt load. The speed sensor is directly coupled to the follower pulley or large diameter rollers and provides a series of pulses, each pulse representing a unit of belt motion, at a frequency proportional to the belt speed. The weighing instrument receives the output signals from the weighing module and the speed sensor, electronically multiplies the belt motion and belt load, and produces an instantaneous flow value and a cumulative total by calculating the time. The cumulative total and the instantaneous flow are converted into selected engineering units and displayed on the accumulator respectively.

The weighing bridge of belt scale acts on the weighing sensor through a lever to send the weight of the material detected on the belt to the weighing instrument. At the same time, the speed signal of the belt conveyor by the velocity sensor is also sent to the weighing instrument. The instrument integrates the speed signal and the weighing signal to obtain the instantaneous flow and 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.

Belt scales are used for the quantitative feeding of bulk materials, the feeding process is continuous belt feeding, the feeder will come from the user feed bin or other feeding equipment to transport the material and through the weighing bridge for weight detection.

The weighing belt conveyor is used for the quantitative feeding of bulk materials, the feeding process is a continuous feeding of the belt, the feeder will be from the user feed silo or other feeding equipment to transport the material and through the weighing bridge for weight detection, at the same time mounted in the tail pulley of the speed sensor to detect the speed of the belt. The measured weight and speed signals are sent to the accumulator for differential processing and display the instantaneous flow in tons per hour for comparison, and according to the size of the deviation from the output of the corresponding signal value (PID signal), through the frequency converter to change the speed of the motor to change the feeding volume, so that it is a certain amount of time with the set value, so as to complete the control of a constant feeding flow.

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.