UniMAT PLC application in plastics extrusion machine control system

Abstract: this article in view of the plastic extrusion machine control system has high cost, low speed, the problem of low precision, adopt the way of communication with UniMAT PLC is put forward in the application of the plastic extruding machine control system. Results show that the method reduces the cost of the UniMAT PLC, achieved the effect of high speed and precision. Keywords: 16 tc ( UN 231- 7PL22） And UniMAT CPU224, 485 communications system overview: this company is a machinery manufacturer do 16 area of single screw extruder, the control unit contains host heating system, host speed control system, traction control system, cutting control system, and some safety protection function. Its working process, screw tubes, mould heating and heat preservation time after reaches the set temperature, open the host material, open traction after discharge, set the cutting length on the screen, after reaching set length start cutting machine. Second, the system requirements, 1) Extrusion system, extruding system, including screw, barrel, hopper, the nose, and mould, plastic and plastic into homogeneous melt by extrusion system, and in this process is set up under pressure, be screw continuous extrusion through the mould forming products. （ 2) 's role is to drive the screw drive system transmission system, provide the screw in the process requirements of torque and rotational speed, usually composed of motor, reducer and bearing, etc. Currently use most drive is the inverter, the inverter output stability or not directly related to the stability of the extrusion. （ 3) Heating cooling system, heating and cooling is necessary in the process of plastic extrusion conditions: 1, now squeeze molding machine with electric heating, usually divided into resistance heating and induction heating, heating tablets, neck, head, the local in the fuselage. The plastic inside the heating installation by external heating tube, heating, to reach the temperature of the process operation demand. 2, cooling installation is to ensure that the plastic in the temperature range of technical requirement. Its purpose is to remove the screw rotating the excess heat generated by the shear friction, in order to prevent the temperature is too high to make plastic synthesis, scorch or finalize the design difficult. Barrel cooling can be divided into water and air cooling two kinds, ordinary small and medium-sized squeeze molding machine adopts air cooling is good, while more of the large separation by water or two ways of cooling; Screw oil cooling cooling mainly adopts center, purpose is to increase the rate of material solid walks, stable feed rate, improve product quality at the same time; But the cooling in the hopper, one is in order to enhance the transport of solid materials, avoid make jam the material plastic grains sticky with heating, 2 it is to guarantee the normal work of the local transmission. （ 4) Control system, control system consists of touch screen, PLC controller, pressure sensors, temperature sensors and some execution devices, etc. Automatic control system is an interface of man and machine, the machine all the parameters are set here, monitoring and the start-stop of the machine. Response to a degree of automation and reliability of the machine is here. Of three implementation system, system configuration and function: Siemens man-machine interface SMARTLINE700 matches the company designed for molding machine keyboard CPUUniMATCPU22416TCUniMATUN231 - 7PL224AIUniMATUN231- 0HC228DIUniMATUN221- 1BF2232DOUniMATUN222- 1 bl22 Siemens inverter control scheme of the control scheme is characterized by 440, the host and traction speed of the communication control reduces the PLC analog output of 2, 4 analog input, 2 emergency alarm input, digital output to 2. Using 16 road temperature measurement module, high integration, collecting signal of high precision, fast speed, using the PID temperature control precision, static is less than 1 degree. Low prices, the most obvious advantage of this set of system temperature control cost 1 road in about 100 yuan, and normal temperature control table price is quite, but after using this system the mechanical control level a level, improve the competitiveness of products, also improve the product's profits. System functions to achieve 1, Siemens SMARTLINE 700 color touch-screen, screen can switch in both Chinese and English, to go for the keyboard, the beauty is generous. 2, using UniMAT UN200 CPU, the temperature control of as many as 40 area, can realize double cooling/heating output control. 3, the system speed synchronization, as well as stand-alone fine-tuning. 4, real-time display speed, torque, current and pressure detection. 5, all the operation of the main machine status and parameters display. 6, automatic alarm prompt. 7, a screw heat preservation function, to prevent low temperature start the screw. Eight, can realize the host pressure closed loop, traction pressure closed loop, and other functions. 9, can achieve the function of the whole machine preheating. 10, can detect damage is the original heating and thermocouple wire break. 11, can prevent the screw running on an empty stomach, avoid glue rod ( Shaft) Phenomenon. 12, easily extend the functionality, such as gravity feed. 13, guarantee is 0 hz start screw, prevent damage of the high-speed start screw device. At present domestic most of the extruder is controlled by temperature control table, although the scheme has the advantage of low price but of great limitations on the control function. After using this solution to the whole process of extrusion process parameters such as melt pressure and temperature, paragraphs body temperature, screw and traction speed, feed feed rate, ratio of various materials, such as current voltage of the motor parameters online detection, and its intrinsic to the closed-loop control. This to ensure stability in the process conditions, improve the accuracy of the product is very favorable.
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