Vacuum molding machine V80 system control scheme is introduced

A, vacuum molding machine working principle of the vacuum molding machine is the use of vacuum suction, will heat the plasticizing of PVC, PE, PP, PET, HIPS and other thermoplastic coil made into various shapes of advanced packaging decoration box, box, etc. Its main structure is made up of feeding, pull up and down, the electric heating furnace, brake, the multi-function adjustable size, lower die plate, on the upper die, brake, knife switches, slicing, and match with vacuum unit, etc; Is given priority to with pneumatic device power source, its pull piece and piece USES motor, reducer, time relay, intermediate relays, trip switch of electric equipment such as automatic control system. Vacuum molding machine to the requirement of control system is to ensure that the function of simple operation, mechanical action and temperature control of high precision, short production time, under the condition of same production save mechanical power consumption as much as possible. Second, the current problem of vacuum molding machine and DE d solution countermeasures at present, the machine adopts thyristor and STEP CONTROL limit, partition USES solid state relay on-off CONTROL scheme, the following problems: 1) For each different material for blister, need adjustments multiple thyristor, need a long time temperature adjustment time. 2) Current temperature division for three, partition is too large, unfavorable machinery and equipment control and increase energy consumption. 3) Solid state relay switch due to control more brick of electric current is bigger, easy to cause poor contact oxidation. To solve above problems, equipment modification Suggestions: 1) With PLC to replace the SCR for temperature control. Can make the temperature control scheme programming, save control parameters of each material and improve temperature control accuracy. 2) The original partition control instead of each electric brick independent temperature sampling and output control, improve the control of flexible. 3) Control of the heating element USES the PWM pulse width modulation technology, reduce the volatility of PID regulation, reducing lag, improve the reliability of the equipment, and shorten the production of the equipment debugging time; 4) Using touch screen as man-machine interface, and improve the degree of automation of the machine, beautiful and efficiency. 5) Suggest user factor of comprehensive cost and efficiency in solid state relay, silicon controlled rectifier and IGBT three ways of choosing a as the switch control of the heating elements, improve the heating efficiency. Three, profile control system scheme based on the above ideas, the DE d developed V80 series PLC, thermocouple temperature input module, PWM output directly for the temperature control scheme, at the same time, the action of the machine and motion control by PLC, man-machine interface with touch screen, can be on the screen for parameter setting and modifying, and at any time to check the temperature condition and production situation of each electric brick. I/O requirements of control system block diagram system are as follows: the TC ( Thermocouple temperature input) : 78, PWM output: 78, DI: 32 road, DO: 32. PLC used the latest series of V80 small controller, anti-interference and reliability than any small PLC on the market. No. 5 THM temperature control module is used temperature control module, temperature control module ontology with PMW temperature control output, so the integration is very high, but also greatly improve the control performance, and cost is greatly reduced. System of temperature control, the use of each electric brick a thermocouple sensor, the sensor signal input directly to the thermocouple module E5THM V80, each THM module can receive 5 TC signals at the same time, with 5 road PWM output; And THM10 internal with CPU module, the module inside with a PID arithmetic module, can be controlled according to the predetermined plan control PWM output, have the effect of regulating temperature. Four advantages, system USES this system can have the following advantages: temperatures to be controlled by PLC to replace the SCR, save a lot of work, artificial adjusting STEP CONTROL knob PLC controller automatically according to set the temperature of the heating plate to adjust to predetermined temperature. Because the quantity of electric heating tile is bigger, This machine is 78) So that we can save a lot of equipment commissioning and preheating time, improve the productivity of the equipment. Using touch screen as man-machine interface, can be intuitive understanding of the production status of the equipment, improve the machine's modernization degree and the degree of automation, convenient operation, can realize more than one machine. System can be carried out on the equipment production equipment failures and operating errors alarm, improve the safety of the equipment. PLC has a lot of memory can save the control scheme of different material, so, when using the equipment materials that have been processed, can directly bring up the past control plan, if there is a better solution, can be updated preservation solution, further save user's time. The original partition control instead of each electric brick independent temperature sampling and output control, can be carried out on the hot plate temperature control scheme programming, can be controlled by electric brick individually, improve temperature control accuracy and blister processing quality, improve the flexibility of production control and achieve accurate, stable and fast. The PWM pulse width modulation technology combined with PID control algorithm, can reduce the volatility of conventional PID adjustment reduce lag, improve the reliability of the equipment, and shorten the preheating temperature of the equipment.
At the same time, as the recent research of Coolmay shows, the benefits of improved productivity and firm performance can make implementing basic management practices worth it.
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