1. Overview
EVA is a kind of shoe foam materials, foaming ratio can be divided according to L, M and S are three types of shoe-making process requirements under the different products, divided into the bottom , slippers and other. Injection machine gun mobile structure is divided into linear, fan beam of two, forming station structure is divided into direct compression , song shoulders are two types of applications under the current market there are several shape 10,8,6,4 station, now six points for the mainstream market.
2. system components
control system mainly consists of injection gun, injection, Block shift, opening and closing mold, movements and temperature control. 6 points is to direct compression , double-injection gun, the form of an example mobile fan following chart:
1) injection gun:
Process requirements are mainly out of feeding quantity, particularly on the end , required materials control within 0.8g. Because this product is semi-finished products need to meet with other products. All asphalt injection gun absorbed by the action of pressure and flow control scaling board, the entire injection process requires the pressure and flow to curve decreases. Ruler with the resistance test feeding quantity, electrical control requirements on fast response time, CPU, analog resistive scale and high accuracy requirements. Temperature should be controlled within plus or minus 1 ???.
2) shift Block: Block the transfer process requires that the mobile stable, fast, accurate positioning (0.6mm inside), on the inverter to respond to a higher speed and position detection request process to request and mold into the injection port entrance and exit are a butt.
3) clamping: The key is rapid tooling process control, a large percentage of the foam is more important. Electrical control of the process is demanding rapid response to ensure complete gate in 0.8 seconds fast mold section.
4) mold temperature: different for different raw materials, foaming temperature, foaming temperature instability will lead to incomplete, so the temperature guarantee of plus or minus 1 ???
3. electrical configuration <BR> according to system requirements, considering the system performance and cost, using the following configuration:
Interface with XBTG5230 with Ethernet, programming software Vijeo_Designer;
TSXP573623M built by the main CPU Ethernet port, PL7 PRO software programming;
feeding quantity was measured with 16-bit precision TSXAEY414;
each sub-station controlled by the Twido TWDLCAEA40DRF four for existing I / O, the CPU built-in Ethernet port and MODBUS port, use the Ethernet, the communication rate up to 100Mbps, and can function through Bootp For any distribution of IP addresses, high-speed stability and control, and mold opening and closing control;
transfer seat with ATV31 frequency converter;
4. Summary
the system is centralized control, high-precision PID temperature control, high-speed clamping response; control structure with sub-station, simplifying wiring costs. Most importantly, the entire system through the Twido PLC built-in high-speed Ethernet data exchange, ensure the clamping response time, CPU speed to respond to ensure accuracy of injection feeding quantity.