The weighing hopper machine is composed of a storage hopper, a feeding door, a weighing hopper, a discharging door, an unloading hopper, a weighing module, a material level gauge, a scale calibration device, a control cabinet and a circular closed scale body, etc. The control cabinet is equipped with a PLC, a touch screen, weighing instruments, etc. During the feeding process, the weight of the material entering the weighing hopper is converted into a millivolt-level analog voltage signal by the weighing module and then sent to the industrial weighing instrument. The weighing instrument converts this signal into a weight data signal and transmits it to the PLC through serial communication. This data is compared with the preset single scale target value on the touch screen or computer minus the lead amount (difference) If this weight data is less than the difference, the feed output point on the PLC remains connected, the feed valve remains open, and the feeding process continues. When this weight data (i.e., the weight of the material in the scale hopper) reaches this difference, the feed output point on the PLC is disconnected and the feed valve of the scale is closed. When all the materials in the air have fallen into the scale hopper and the scale is stable, the weight data at this time is the actual weight of the materials on this scale. The PLC sends the weight value of this material to the internal accumulator for accumulation, and then the printer prints it out. Then, the discharging process of the scale begins. The discharging output point on the PLC is automatically connected, the discharging valve of the scale opens, and the discharging process starts. After the scale is emptied, the discharge valve will close automatically. At this point, the current weighing cycle ends, and the feeding process for the next weighing cycle automatically begins. This cycle continues until the system stops automatically after the last weighing cycle ends.

The weighing hopper machine is mainly composed of standard weights and a lifting mechanism (cylinder). When it is necessary to calibrate the scale (the working mode is manual), just set the weight selection switch on the control cabinet (or on-site operation box) to the "Add" position, and the cylinder will act to lift the weight. After the scale calibration is completed, simply place the weight selection switch in the "Unload" position, and the cylinder will act in the opposite direction to lower the weight. The adoption of an automatic scale calibration device significantly reduces labor intensity, shortens the calibration time, and eliminates the influence of human factors. The calibration of new scales, the recalibration of old scales, and the periodic inspection of scales can all adopt this device, but it should be carried out by dedicated metrology personnel in accordance with the latest "Verification Regulations for Non-Continuous Cumulative Automatic Scales". The regular calibration work of scales can be conducted by operators with the aid of this calibration device.

The weighing hopper machine is composed of the overflow level controller, high level controller and low level controller of the storage hopper, the high level controller of the weighing hopper and the high level controller of the unloading hopper. The overflow level of the storage hopper and the high level controller can control the working status of the upper-level material conveying equipment (such as scraper conveyors, bucket elevators, etc.). When the material in the storage hopper exceeds the position of this material level controller, the material level controller operates and outputs a set of control contacts (passive), causing the upper-level material conveying equipment to automatically stop. When the material in the storage hopper drops below the position of the high material level controller, this material level controller resets, and the upper-level material conveying equipment automatically starts again, thus avoiding the blockage phenomenon of the upper-level conveying line. The low material level controller of the storage hopper can control the opening of the feed door to ensure that there is a certain amount of material in the storage hopper. At the same time, it guarantees that there is always a certain amount of material in the storage hopper while the material is being fed into the weighing hopper, so as to prevent the material conveyed by the upstream conveying equipment from directly falling onto the scale structure and reduce the wear of the scale structure. The high material level controller of the weighing hopper can prevent the overflow of materials in the weighing hopper. The high material level controller of the discharge hopper can control the working state of the discharge valve of the weighing hopper. When the material in the discharge hopper exceeds the position of this material level controller, this material level controller will act to prevent the weighing hopper from discharging materials. When the material in the discharge bin is lower than the position of this material level controller, this material level controller resets, allowing the weighing hopper to discharge materials into the discharge hopper.

The weighing hopper machine is composed of two sets of Weighing modules, each corresponding to the corresponding instrument. During the operation of the scale, the two sets of devices are compared and calibrated against each other. Once there is a problem with the comparison, the operation is immediately stopped. The faulty weighing module group is determined manually. If it is necessary to continue working at this time, the mutual calibration function of the two scales can be turned off, and the normally working weighing module group can be selected to work again. This device reduces the inaccurate measurement of the scale and the downtime caused by the damage of the weighing module.