Application of semi-automatic batching system based on PC as upper computer and PLC as lower computer in rubber products production. In this system, buckets filled with various raw materials are installed on shelves. The back of the bucket is equipped with an air cylinder and an electromagnetic valve, and the bucket is pushed by the air cylinder. When the electromagnetic valve receives the PLC instruction, it is opened to push the bucket out of the loan rack, and then the workers can take the material from the bucket. On the one hand, PLC communicates with the upper computer to receive instructions, on the other hand, it sends instructions to each solenoid valve to control the entry and exit of each bucket.

Gum mixing and dosing system consists of two parts, the main circuit and PLC system, each component is fed into the metering drum by the pump, successively injected into the mixing tank by the glue release valve, and their respective weights act on the weighing module. When the load cell is subjected to force, the output voltage signal 0-10V is sent to the A/D converter (weighing instrument), converted into a digital signal and sent to the PLC for processing, the various components of the refilling control value has been input into the PLC through the human-machine interface (HMI). the PLC will be detected on the weight value sent to the HMI to display and compare the value with the given value, when the detected value is equal to (or greater than) the given value, the control interface outputs a control signal to make the refilling interface output control signal, so that the filling valve to stop the release of glue, add the first raw materials. Then add the second raw materials, and sequentially refill the other various components of raw materials. After all the filling, PLC sends out a signal for stirring, the stirring time is set by HMI and sent to PLC, after stirring, the glue is automatically released into the core (surface) layer tank.

The pneumatic conveying system consists of four parts of the process part and the control device, respectively, the power device (gas source) that provides conveying gas, the device that mixes the material with the conveying gas and feeds it into the pipeline, the conveying pipeline and elbow, the gas-solid separation device and the control device. Among them, there are air compressor, Roots fan and so on to provide the power device for conveying gas; there are silo pumps, screw pumps, feeders and so on to mix materials with conveying gas and feed them into the pipeline; the gas-solid separating device is the bag duster and other equipments mounted on the silo. In addition, there are gasification wind system, unloading equipment and other auxiliary systems and equipment.

OMRON programmable controller in the production of wood-based panels, dosage system with a programmable controller as the control core, with level sensors and actuators for the volumetric method of glue dispensing, to achieve automatic glue dispensing control, to stop when the corresponding set value. It is controlled by a three-phase frequency conversion motor driving a water pump, and the feed of hardener, water and ammonia is controlled by a cut-off solenoid valve, and the control system has to provide corresponding electric power driving and controlling power for the motor and solenoid valve. All kinds of raw materials are set up a measuring cylinder, measuring cylinder is equipped with a probe to detect the liquid level. There are two liquid level probes in each of the two glue metering cylinders, one probe is used to set the glue level when dispensing glue in the surface layer, and the other one is used to set the glue level when dispensing glue in the core layer.

The automated batching system adopts a three-level control method: upper machine station → PLC → weighing instrument.The silo is divided into three specifications: large, medium and small according to needs to better control the accuracy and feeding frequency, and adopts a horizontal spiral variable speed feeding method.

The microcomputer batching system sequentially controls all kinds of ingredients such as solvents, additives and liquids to enter the weighing reaction kettle, in which dry materials are metered by a vibrating plate, powder materials are metered by a screw feeder, liquid materials are metered by a hydraulic valve, and paste materials are metered by a pump. For each ingredient, coarse material and fine material are used successively to ensure the weighing accuracy of 98% ~ 99%. The weight of the material is converted into an electrical signal by the three weighing instruments installed on the supporting frame and suspended in the weighing reactor, which is read into the computer for weight calculation after A/D conversion, and the result is compared with the set value after tare removal, which serves as the basis for controlling the material switching or the conversion of coarse and fine feed.