1. Overview
EVA molding machine is the main raw material production to EVA midsole, slippers, sports goggles and a variety of footwear accessories, and can coordinate with other molds, raw materials for production of other products. In recent years, the rapid development of China s footwear industry, shoe production in total production accounted for 51% of the world; At the same time, the Chinese shoe-making machinery industry has been rapid growth, with annual sales of 20% annual growth rate .
in the control system, because of the relatively large number of process control and logic control, on the PLC s CPU processing speed demanding. We used to premiun based computing CPU, Twido PLC for the intelligent distributed I / O. In this configuration Twido PLC logic signals and the main processing site ATV31 Inverter communication control and other communications equipment. Twido PLC solve local control tasks, reducing the amount of the main CPU process, reducing the cost of the program components.
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, mobile linear example, the analysis of the whole control process and the electrical system:
1) injection gun: technology requirements primarily out of the feedrate, in particular, to do 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 the B11 ???.
2) shift Block: Block the transfer process requires that the mobile stable, fast, accurate positioning (0.6mm inside). Response of the converter has high speed and position detection requirements. Because the injection port and the mold has one pair of feed inlet is required.
3) clamping: The key is rapid tooling process control, a large percentage of the foam is more important. Electrical control of the process as quickly as possible, to ensure complete gate fast in the 0.8s mold section.
4) temperature: the temperature difference of different foam materials, foaming temperature instability will lead to incomplete.
5) electrical configuration are as follows:
operation with Ethernet interface with XBTG5230
main CPU built-in Ethernet port using TSXP573623M
by Twido TWDLCAEA40DRF four as distributed I / O, the CPU built-in Ethernet port and MODBUS
moved by ATV31 Inverter Block
3. Summary
the machine is fully hydraulic operation, in addition to taking the rest of tailor-finished outside the automatic control operation and parameters of computers with human interface and database, providing rapid, precise production conditions. Because the system uses multiple Twido PLC integrated CPU and 100M Ethernet expansion modules as distributed I / O, greatly reducing the system cost, while, 100M high-speed Ethernet system to ensure high dynamic response ; Twido PLC CPU with MODBUS communication port, plus other accessories from time to control also comes with MODBUS port ATV31 Inverter. Twido PLC programming software built-in macro communication, making communication simple and effective control ATV31 Inverter and saving I / O. All these features make the entire system with a high cost, which greatly enhanced the competitiveness of this product in the market.