Checkweigher generally consists of control device, classification device, conveying device and sorting roadway. The function of the control device is to recognize, receive and process the sorting signals, instruct the sorting device according to the requirements of the sorting signals, and automatically sort the commodities according to the commodity varieties, according to the commodity delivery location or according to the category of the owner. These sorting requirements can be through different ways, such as bar code scanning, color code scanning, keyboard input, weight detection, voice recognition, height detection and shape recognition, etc., input to the sorting control system, according to the sorting signals to determine a certain kind of goods should enter which sorting channel.

Consecutive Sorting machine completes the measurement of product weight in the process of product conveying, and compares the measured weight with the pre-set range, and the controller sends out the instruction to reject the products with unqualified weight, or distribute the products with different weight ranges to the designated area. Online sorting scale consists of weighing conveyor, controller and inlet/outlet conveyor. The weighing conveyor collects the weight signals and sends them to the controller for processing. The in-feed conveyor ensures adequate spacing between products by increasing the speed. The outfeed conveyor is used to transport the inspected products away from the weighing area.

The automatic inspection machine adopts the electronic scale control method. After the inspected product enters the inspection machine, the weighing system recognizes that the product to be inspected enters the weighing area according to external signals, such as photoelectric switch signals, or internal level signals. According to the running speed and the length of the conveyor, or according to the level signal, the system can determine, the time when the product leaves the weighing machine. From the time the product enters the weighing platform to the time it leaves the weighing platform, the weighing module will detect the weight signal, and the weighing instrument will select the signal in the signal stabilization area for processing, so that the weight of the product can be obtained. Sorting process When the controller gets the weight signal of the product, the system will compare and sort the product with the pre-set weight range.

The detector can be integrated with all kinds of packaging production lines and conveying systems, and is mainly used to detect whether the product weight is qualified or not and whether there are missing parts in the packaging. Or according to the different weights of the articles. Control the identification, reception and processing of sorting signals, instruct detection according to the requirements of sorting signals, and automatically classify commodities according to commodity varieties, delivery places or categories of consignors. These sorting requirements can be input into the sorting control system in different ways, such as bar code scanning, color code scanning, keyboard input, weight detection, voice recognition, height detection and shape recognition, etc. According to the judgment of these sorting signals, it is decided which sorting crossing a certain commodity should enter.

The main electrical control part of the filling machine is a Siemens S7300 series PLCCPU317-2PN/DP. The filling valve control part is a control system module EX484. Siemens PLC is responsible for the safety functions, speed control, high level buffer tank level control, return cycle heating, CIP in-situ cleaning, height adjustment, signal exchange, etc. The control system is composed of Siemens PLC buses. Siemens PLC control system consists of two buses, Profibus and ASI bus. The filling machine is responsible for filling valve metering cylinder level control, tank filling level control, filling valve pneumatic control, filling angle time control and so on. The filling valve control is composed of two buses: Powerlink bus and CANbus bus.

The filling machine calculates the position information of the circular filling port in the image of the barrel cover surface, namely the filling port radius, the filling port center mark and the height of the oil gun. The corresponding position information is transmitted to the stepper motor control system, and the motor control system drives the shaft stepper motor according to the pulse instruction issued by the computer, and drives the oil gun to run above the filling port to realize automatic positioning and filling.

Propanol filling machine is driven by stepping motor to drop down to reach the lower limit position, the well is signaled by the travel switch, and the PLC controls the filling valve to open fully for filling. The use of local area network realizes the communication between the field computer and the equipment, through the RS485 network can communicate with the filling machine each other. The use of multiple filling machines can easily constitute a RS485 distributed control system network.

Multi-bin weighing system adopts PLC ladder diagram programming to realize various logic sequence control and flow rate detection control. The control system can realize automatic/manual switching and frequency conversion/industrial frequency switching (if it is necessary to inject the reaction tank quickly, the industrial frequency operation mode can be used). When using the frequency conversion start-up mode, the frequency converter frequency rises to 25Hz in the first 3s, and then drops to the lowest frequency after 2s. This start-up process allows the air in the transfer pipe to be exhausted, and the starting flow rate is extremely small. Then the frequency converter is slowly accelerated from the lowest frequency to ensure that the flow rate is increased linearly, so that the injection volume increases with time in square proportion to meet the process requirements.

The automatic batching system is used as a central control area to complete the whole process of weighing and feeding. Before the equipment is equipped, the staff will open the switch, and the PLC central control area will send a signal to start the corresponding solenoid valve to inject the material into the reactor. At the same time, the weighing module will start to work. When the amount of the reaction tank is increased to the equivalent of the weight set by the quantitative setting reference, the central control area receives the action signal of the weighing module, and immediately closes the solenoid valve for adding materials and stops adding materials.