The weighing module amplifies the weak analog signal output by the sensor by a certain multiple to meet the requirements of the A/D converter for the input signal level. The function of A/D conversion is to convert analog signals into digital signals, carry out analog-to-digital conversion, then send the digital signals to the display circuit, and finally display the measurement results by the display circuit.

The weighing module completes the storage of sampling data, interrupts the service, completes the scanning, determines the number keys or function keys, and sends data to the data buffer and the display buffer when the number is digital. The output voltage signal is accumulated through the junction box and transmitted to the weighing instrument, which displays the material weight in the current weighing (reaction tank) in real time through A/D conversion. Print metering data in real time, save historical data records, and allow users to monitor the working state of the reaction tank and find historical data.

The weighing module thus overcomes many shortcomings of traditional analog signals, such as easy interference and attenuation, and greatly improves the reliability of the weighing system. Weighing module has become a necessary device in process control, which has been applied to almost all weighing fields, from the weight measurement of large storage tanks and hoppers and the control of cranes to the mixed distribution, automatic detection in production process and the control of powder feed.

Weighing module refers to a weighing system that integrates the collection, amplification, transformation, transmission, processing and display of weight information. Its structural principle is to process elastic elements that feel vertical load and horizontal load at the same time on the weighing plate, and sense the weight of vertical force. It draws lessons from advanced technology and technology, and combines its long-term accumulated experience to integrate inventory management, formula management, ingredient weighing, process control and product traceability. Automatic technologies such as barcode (two-dimensional code /RFID) identification, wireless transmission, automatic weighing, PLC control, electromechanical, computer interface, etc. are adopted to independently develop and complete the intelligent formula weighing and inventory management system, so as to prevent wrong materials from appearing in ingredients, ensure weighing accuracy, ensure the accuracy of formula technology, make each batch of ingredient data recorded and traceable, and follow the principle of first-in first-out when raw materials are delivered from the warehouse, effectively solving the waste of raw materials.

The weighing module dynamically displays the running status of each automatic batching system in real time, including the real-time change of the weight of the raw material tank, the feeding flow rate of various materials, the valve action and the temperature display. The simulated flow chart is vivid and intuitive. The weighing module can display the real-time curve and historical curve of each process parameter, and compare it with the set process curve to guide the process operation. The historical curve can save data for one year or more, and users can consult it at any time. Pre-store various process curves and ratios, and issue control requirements to the weighing and batching system at any time according to the process requirements of each product to complete the rapid transformation of production varieties and production processes.

The core part of the weighing module is CPU, which communicates with the modules installed on the rack by using the backplane bus of the rack. On the premise of hardware self-inspection, the module installation inspection and program scanning are carried out, and the I/O module values are stored and updated regularly. The analog module is used to poll each module of the equipment and constantly update each channel, and the results are directly input and output after the program execution. Even if the HMI fails, the normal operation of the system will not be affected. At the same time, the weighing sensor has the functions of interlocking control of itself and the surrounding system, controlling the running state of the motor, various feeders, baffles, charging doors, measuring hoppers and other components in the control system, detecting the running state of the state sensor, monitoring the field situation in real time and giving an alarm at any time, transmitting the running state of the system to the upper computer in time and accepting the supervision of the upper computer all the time.

Weighing module Taking a typical chemical reaction kettle as an example, three pressure weighing modules installed at the bottom of the reaction kettle transmit the weight signal of the kettle body to the junction box. Each weighing module signal is connected in parallel in the junction box, and the angle difference can be adjusted according to the load of each weighing module, and the collected weight signal is sent to the weighing end or weight transmitter. The weighing terminal or weight transmitter processes the weight signal into corresponding weight data.

The Cantilever Beam weighing module is elastically deformed under the action of external force, so that the resistance strain gauge attached to its surface is also deformed. After the deformation of the resistance strain gauge, the resistance value will change, and then this positive change will be converted into voltage by the corresponding measuring circuit, thus completing the process of converting external force into electrical signal. Among them, the resistance strain gauge is a strain gauge by mechanically distributing an electric limiting wire on a substrate made of organic materials.

The load cell of the Points belt scale is installed on the weighing bridge, when the belt is working normally, the detected weight of the materials on the belt will be transmitted to the weighing instrument, and the speed signal of the belt conveyor detected by the speed sensor of the belt scale will also be transmitted to the weighing instrument, which will convert the speed signal with the weighing signal and get the instantaneous flow rate and the cumulative output. The speed sensor is directly connected to the large diameter speed measuring pulley, and is used to provide a series of pulse data, each pulse represents a belt motion unit, and the frequency of the pulse is proportional to the belt speed of the conveyor.