introduction With the continuous improvement of living standards, people's demand for various leisure and convenience foods has also increased greatly, which has further stimulated the rapid development of my country's food packaging industry. Packaging machinery is developing rapidly and has broad prospects for development. Its automation level is constantly improving. Automatic control technology is increasingly used in weighing and filling production. It is used in rice, beans, milk powder, feed, metal powder, and plastics. Particles, various chemical raw materials, light industry and other industries have a wide range of applications. Compared with the traditional weighing instrument control, the control system composed of PLC, touch screen, frequency converter (or servo) is convenient to organically combine functions such as weight setting, switch setting, operation setting and parameter modification, thereby improving the speed and accuracy of the machine. And the ease of operation. â–¼ Automatic weighing, filling and packaging machine The automatic weighing, filling and packaging machine is composed of feeding, weighing and unloading parts. The feeding part is divided into a storage hopper and a gravity feeding device. The storage hopper is used to store the materials that need to be filled, and the gravity feeding device mainly provides materials to the weighing hopper. The weighing part is the weighing hopper, which is connected to the load cell to measure the weight of the material. The blanking part is used to complete the blanking and bagging of weight materials. Its work flow is: manual assistance in bag loading, automatic weighing, bag clamping, filling, vibration, bag pushing, and automatic sewing or sealing by conveyor belt. By changing the feeding method, it is suitable for open-mouth bag quantitative packaging of ultra-fine powder to large particle materials. â–¼ Work flow chart The system is mainly controlled by the switch. The bag loading, bag feeding, material door, holding bag, etc. are driven by air cylinders. The equipment can be operated manually or automatically. Manual operation requires separate operation and control of each movement of the machine with buttons. Automatic operation After selecting "automatic mode" on the touch screen and pressing the "start" button, the machine will automatically and continuously cycle periodically. If the stop button is pressed during work, the machine stops (the feeding action also stops, and the weight of the remaining material in the weighing cylinder is memorized), press the "reset" button, and the equipment returns to the initial state. â–¼ Control system icon â–¼ Field application diagram For the operation and control requirements of this automatic weighing, filling and packaging machine, the control system uses Banner's BSP02 series PLC. This series of PLC has the characteristics of compact structure, modularization, strong expandability, and rich instruction set. It has strong adaptability to external interfaces. And 1 RS485 communication port, 1 RS232 programming port, with standard Modbus communication protocol. The weight processing obtains the real-time weight value through the RS485 communication port of the PLC and the weighing module communication; the screw feeding and the bag out conveyor belt are driven by the BMD-A series inverter of Banner company, and the BMD-A series inverter has a 32Bit processor and has a fast response speed. , With the advantages of large starting torque and strong overload capacity, multi-stage feeding can be realized through the multi-stage speed function of the frequency converter up to 16 stages to ensure weight accuracy; Banner's THM series touch screen performs process monitoring and display and parameter setting functions for the entire system. The system is designed for each function screen, including display function, parameter setting function, scale calibration, automatic peeling, parameter formula function of different materials, etc. â–¼ Part of the program setting diagram In the processing of the weight signal, due to the interference of the weighing signal, it is necessary to filter the signal and determine whether the signal is stable and whether the reading is accurate. In the PLC program, the weight data returned by the weighing module is processed accordingly to make the weight value accurate and high stability. After the on-site commissioning of the equipment is completed, the powder is actually packed at the end user, the filling and weighing weight error is small and stable, the performance of the whole machine is stable, the operation efficiency is high, and the customer's use requirements are exceeded. Ic Data Acquisition,Data Acquisition Analog Front End,Data Acquisition Analog To Digital Converters,Data Acquisition Digital To Analog Shenzhen Kaixuanye Technology Co., Ltd. , https://www.icoilne.com
