The constant belt scale extracts products from the hopper scale through a constant cross-section, and adjusts the extraction amount by changing the belt speed based on a fixed reference flow rate set point to maintain a constant weighing flow rate. It mainly consists of four parts: driving device, weighing device, weighing Feeder, and electronic control system. The driving device consists of a driving motor, a gear reducer, etc. The weighing module device consists of weighing rollers, Electronic scale brackets, weighing sensors, weighing instruments, and belt speed measuring devices. The belt feeder consists of a driving drum, a driven drum, a carrying roller, a feeding hopper, a reversing drum, an annular belt, a belt tensioning device, a belt inner and outer cleaning device, an automatic belt correction device, a guide baffle, and a feeder frame. The electronic control system consists of a control cabinet, control buttons, contactors, and emergency stop devices.

The scattered materials in the storage bin flow onto the continuously running circular belt of the belt scale through the unloading mechanism. The weighing device installed on the feeding scale measures the weight of the conveyed materials, generates a voltage signal proportional to the belt load, and sends it to the weighing instrument. At the same time, the weighing instrument receives the speed pulse signal transmitted by the belt speed measuring device installed on the belt scale. The weight signal and speed signal are integrated and calculated by the weighing instrument, and the instantaneous flow rate value and cumulative quantity value of the continuously output material are displayed. The Weighing system is centered around weighing instruments, which are used to complete data acquisition, processing, operation control, display, etc. The weight is transmitted to the weighing module through pressure, and the weighing module can convert the gravity acting on it into a linear voltage output. This tiny voltage output is amplified by a low drift DC amplifier to the voltage amplitude required by the A/D converter, and then the analog voltage is converted into the corresponding digital quantity through A/D conversion. The CPU performs arithmetic processing and finally displays the weight of the heavy object on the LED. Some information can be input through the keyboard to intervene in the CPU's operation, such as requiring automatic zeroing.

The constant belt scale device is the best tool for transporting continuous materials, and the belt of the belt conveyor provides a particularly favorable prerequisite for continuous weighing. By measuring the flow rate of bulk materials during the conveying process and integrating the flow rate, the total weight of the conveyed material can be obtained. It consists of three parts: feeder, belt scale, and control system. The feeder and belt conveyor are both driven by variable frequency motors. The belt scale is based on the principle of leverage, and a lever device is installed under the continuously running belt. When the material on the belt passes through the bearing surface of the lever device, a certain pressure is generated on the bearing surface. The pressure is transmitted to the weighing module through the lever device, and the control device amplifies and processes the weight pressure signal sensed by the weighing module, and displays it in digital form. At the same time, the displayed digital signal can be externally controlled, and the detected bulk material flow signal is compared with the set flow signal in the control system, and PID is used Adjust and drive the frequency converter to change the speed of the feeder and belt conveyor motor, automatically adjust the speed of the belt according to the actual required feeding amount, track the given feeding amount, and thus form a control characteristic of slow speed when there is more material on the belt, fast speed when there is less material, and even stop when overloaded, in order to obtain the given material flow rate.

Technical Parameters:

Single tray accuracy:+/-1%

Duotuo accuracy:+/-0.5%

Suspension accuracy:+/-0.125%~0.25%

Belt speed: 0~6m/s

Remote transmission: 1000m

Conveyor inclination angle: 0-30 °

Environmental temperature: -20 ℃ to+50 ℃

Weighing instrument: 0 ℃~40 ℃

Power supply voltage: 220V (+10%, -15%) 50Hz ± 2%

Relative humidity: around 150%