In PLC application in towel loom let off system

One, foreword towel loom is a kind of rapier loom, the primary difference between it and common rapier loom is the towel loom rapier loom more casual than a warp beam, namely the day! As shown in figure 1, figure 1 towel loom loom manufacturer because is double warp system control is in the corner of complex than general electric control system of the weaving machine. But towel loom day by relatively have the certain independence and particularity, its independence for other control part, there is only tension between them, weft density, velocity, start stop synchronization; Its particularity lies in existence in the whole operation process three tension segment, weft density, this and the ( Ordinary loom beam) Has a significant difference between the two. To this, in the past have different control schemes: 1, calculate the day after the diameter and the initial diameter and velocity to calculate the day by the speed, the sampling scheme need absolute encoder, corresponding speed control device ( Single chip microcomputer) To support and complete the algorithm. This scheme is characterized by system performance is good, but the price is high, the commonly used abroad. 2, control the current tension: timely collection, compared to the current tension signals and set according to the balance conditions determine how much reduced. The use of domestic some manufacturer is the solution. The scheme mainly by single chip microcomputer hardware + LCD + tension sensor, the cost is low, but the poor performance of system operation, the reason is that its algorithm is more rough, the actual system operating day by uneven tension, dithering phenomenon. According to the prior research and experience in the process of debugging, we control system features: A, the system hardware adopts DELTA automation products: PLC controller, ASD - EH type Type A servo controller, TP04G text display, this system maintenance is convenient and easy to upgrade. B, the system software algorithm, and is not the same as before, its characteristic is that: 1) To tension value as the benchmark, tension measurements as reference, to change the tension by speed. 2) The current rate of the initial velocity and pulse increment speed + PID increment speed combined. 3) Pulse wave velocity increment value and the right to incremental PID speed value is not fixed, in the straight from the different value are not the same. Main technological figure 2 fabric towel material through as shown in figure 2 you can see the main process: three tension: raising tension, satin, three processes: plain tension pile, satin gear and plain weft density, weft density, weft density satin file of terry, plain weft density, system architecture, hardware architecture ( TP04+EHPLC+ASD） A and system architecture diagram: figure 3 B hardware structure diagram, PLC control wiring diagram: figure 4 PLC controller wiring diagram, servo control wiring tutu 5 C servo wiring diagram software architecture ( TP04+EHPLC) : four, the first step in debugging the software structure of the table 1: check and electric circuit wiring step 2: input/output signal test step 3: three tension manual test, determine the fourth step, upper and lower tension process parameters setting step 5, servo parameter setting step 6, manual test action debug step 7, express, weft density adjustment ( Fuzz multiple adjustment) Five, the conclusion that this system has been successfully trial in a shandong textile machinery factory, the effect is very good! The system has simple structure, convenient operation, friendly interface, it is the whole system adopts DELTA automation products, so the system is cost-effective, market development and application prospect. In this paper, the DELTA automation products is available for use or towel loom related personnel reference.
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