The hopper Weighing system can achieve the measurement and proportioning of various materials, with the characteristics of accurate measurement, fast speed, no wear on materials, and high measurement accuracy. It has the characteristics of high automation, simple operation, environmental protection, accurate feeding, and high proportioning accuracy. Through the computer control center, the entire production process can be viewed and the workflow can be effectively controlled, eliminating errors that may be caused by human operation. Widely used in the pharmaceutical, food, and chemical industries. The hopper scale measures the liquid (or powder) through the weighing module and adds it to the hopper for timed mixing. After mixing, open the discharge gate and place the mixture into the transition bin. The materials in the transition bin and the weighed resin are evenly placed into the mixing hopper and lifted into the bin by the elevator. Complete real-time monitoring of temperature, pressure, flow rate, etc. on the process site, record historical data, record production parameters, and provide sound and light alarms for manual/automatic status, ingredient status, and protection status to ensure stable operation of the system in fully automatic control mode. The hopper weighing system consists of a hopper scale bracket, valves, electronic weighing scales, junction boxes, signal cables, and intelligent weighing displays. The weight of the material is applied to the hopper weighing system, converted into an electrical signal by the weighing sensor on the hopper weighing system, and amplified by the amplifier in the measurement circuit for display, recording, and data processing. The hopper weighing system can measure gross weight, tare weight, and net weight, and has automatic zeroing and weighing data processing functions. The double-layer weighing scale is installed below the load-bearing hopper. Generally, one hopper weighing scale is equipped with three Weighing modules, which are embedded with weighing sensors; During operation, the weighing sensor undergoes elastic deformation under the gravity of the hopper, and the resistance strain gauge attached to its surface also undergoes deformation. After the resistance strain gauge deforms, the resistance value will change. The detection circuit detects this resistance value change and converts it into a corresponding electrical signal (0-20mV, DC), which is transmitted to the weighing instrument. This signal is proportional to the weight of the material in the hopper, thereby obtaining the weight of the material in the hopper; The output of the weighing instrument is (0-20) mA, and the standard signal of the weighing instrument is sent to DCS or PLC for batching control, measurement, etc.

After the material enters the hopper, it automatically completes the measurement. When the hopper weighing system weighs the powder material, it needs to change and set the quantitative range of the automatic measuring instrument of the hopper weighing system based on the gross weight of the input material measured by the weighing module. According to the preset feeding program, control the frequency converter to perform coarse feeding operations into the hopper weighing system. When the weight inside the hopper of the weighing system changes, the weighing module inputs the detected signal into the weighing controller. After a series of processing, the quantitative range of the weighing instrument in the hopper weighing system is changed and set again based on the processing results. Determine whether the coarse feeding setting value of the weighing instrument in the hopper weighing system has been reached. If it has been reached, control the frequency converter to perform fine feeding, that is, slowly feed the powder material into the hopper; On the contrary, if the coarse feeding setting value is not reached, coarse feeding is carried out again into the hopper until the coarse feeding setting value is reached. When fine feeding is carried out into the hopper, the weighing module of the hopper weighing system detects the change in the fine feeding setting value. If the set fine feeding setting value is reached, the frequency converter is controlled to stop fine feeding into the hopper. At this time, it is also necessary to check whether the weight display of the weighing instrument is stable and there is no deviation phenomenon; If the set fine feeding value has not been reached yet, continue to feed fine into the hopper until the set value is reached. After reaching the set fine feeding value, the weight inside the overall hopper meets the weight requirements for a single feeding. At this time, open the hopper valve and perform the unloading operation. After unloading is completed, reset the weighing instrument of the hopper weighing system to zero, close the discharge valve of the hopper, and complete a measurement operation for powder material feeding.

The hopper weighing system adopts a control cabinet, industrial computer PLC、 Small relays and solenoid valve groups, Electronic scales, weighing devices, industrial computers PLC、 The small relay and solenoid valve group are both installed in the control cabinet. The industrial computer is equipped with an ERP interface module for data connection with the external enterprise ERP system through TCP/IP protocol. One side of the control cabinet is equipped with a small weighing scale, and the explosion-proof weighing scale is equipped with three weighing devices A, B, and C. Each weighing device adopts a weighing platform, multiple stainless steel hopper scales, multiple pneumatic angle seat valves, and multiple transmission pipelines. The stainless steel weighing scale is equipped with a weighing platform, which adopts a high-precision weighing platform. The lower end of the front wall of the double-layer weighing scale is equipped with an opening. By placing the weighing bucket from the opening to the weighing platform inside the weighing scale, the cross-section of the weighing bucket is in the shape of an inverted ladder, which is convenient for receiving from above. The hopper flowing down from the transmission pipeline. Each hopper scale is connected to a transmission pipeline at the bottom, which is made of flexible material. The end of each transmission pipeline is set directly above the weighing platform, and a pneumatic angle seat valve is installed on each transmission pipeline. The industrial computer, weighing platform, and each pneumatic angle seat valve are electrically connected to the PLC, The PLC is connected to the solenoid valve group through a small relay, and the solenoid valve group is pre-set to be in the open, closed, or normally open or normally closed state. Firstly, the PLC receives the information of the ingredient list number read by the card reader or the information obtained by the barcode scanner, and transfers the information of the ingredient list number to the external ERP system. After receiving the information sent by the PLC, the ERP system directly forwards the stored process data corresponding to the ingredient list number in the ERP system to the PLC (the process data is pre opened by the process technician and stored in the ERP system). Then, after receiving the sent process data, the PLC calculates and issues command signals to activate the small relay control solenoid valve group to achieve switch control of each pneumatic angle seat valve, without the need for manual opening and closing, and can be directly operated on the touch screen of the industrial computer. After the weighing and batching are completed, the PLC automatically feeds back the batching order number, hopper weight, hopper name, operator, operation time, actual weighing and batching data to the ERP system. The data that can be stored in the ERP system can be reviewed, and any problems that arise during the production process can be traced to improve efficiency.