light industry

1 Introduction: at present, in the textile market, cloth dyeing is a important process. Dyejigger mainly complete bleaching, coloring, the pressure grinding and other related textile processing technology of finished fabric. Roll dyeing machine control with automatic counting (sermon), automatic turn back and forth repeatedly bleached or dyed), automatic shutdown (scram and stable, there can be no relaxation or drooping cloth). In the whole process, it is required to maintain the fabric tension and linear velocity constant, so to control the mechanical transmission system control level higher requirements.
2, roll dyeing machine process
The mechanical outline drawing of the dyeing machine is as follows:

Mechanical outline drawing of dyeing machine
The dyeing machine is the use of two sets of three-phase asynchronous motor, reducer drive roller after dyeing cloth. When the dyeing machine works, it is a central axis winding control system. Finished fabric first through the cloth motor is in uniform roll to one roller, roller drive shaft installation counting proximity switch (drum rotation every volume, close to switch to generate a pulse), then roll dyeing machine special tension controller the number of a whole piece of fabric. Coil after using artificial way to put one end of the cloth, through dyeing pool, the linkage shaft rolled to another drum and wrapped tight, moving jigger, fabric dyeing. At this time two roller toward the same direction operation and control is always to maintain the fabric tension constant and fabric after dyeing is linear velocity to maintain a constant. This is a no linear velocity feedback. Similarly, there is no tension feedback drive control system. Therefore, control system need adjust volume of inverter output frequency and volume of inverter output torque to meet the unique requirements.

   

3, roll dyeing machine control
The dyeing machine control schematic diagram is as follows:

Sketch of control of dyeing machine
The volume dyeing machine and the PLC as the main controller, uses touch screen as man-machine interface, it is mainly to complete the is cloth tension, operation speed line, fabric thickness, back and forth jigger number setting, the operating frequency of winding motor and winding of the motor output torque calculation, automatic U-turn, automatic parking and other related action logic control. 485 communication (RTU Modbus communication protocol) is adopted between frequency converter and controller. By the control schematic diagram shows: two exactly the same inverter, both of them are working in the PG vector control mode. The moment of cloth, programmable logic controller (PLC) record volumes number cloth ring in the cylinder above and by the operator measurement thickness of the cloth, the input to the controller, the controller will according to the fabric thickness and cloth laps can accurately calculate the drum diameter. The integral method can be used to easily obtain the real turning radius, and the error is small. PLC through real time rotation radius, the user to set the linear velocity and tension, an accurate calculation of the corresponding torque (received volumes of motor and frequency matching (unwinding motor), through the 485 serial communication, transmitted to the inverter ECF500T as controlled, put basic parameters of the winding motor. So that the control of constant line speed and constant tension is guaranteed.

4, system characteristics:
By jig dyeing machine working principle knowable, side volume of the motor is always in the state of power generation, the usual practice are the braking unit and braking resistor, the load back to electrical converter can be in the form of heat consumed. This way is great for the waste of electrical energy in the long term operation of the roll dyeing machine in the power generation state, meanwhile, it is also because of the space of the electric control cabinet to be equipped with a large resistance box. ECF500T series high performance vector transducer can facilitate the support of common DC bus, will two inverter DC Link Parallel roll dyeing machine normal work when, because unwinding braking generated electricity through parallel bus back to coiling motor. As a result, the electric can be fully utilized, and greatly improve the efficiency of electrical energy usage. But when fast stopping, two motors in power, at the top of the convertor still connected in parallel with a braking resistor, the braking resistor is short, with little energy consumption, mainly to prevent the resulting in the parking system of converter overvoltage fault.
5, the end of the language
ECF500T high performance vector inverter control system, compared with the DC speed control system, to achieve a very high cost, for the winding industry to upgrade the product provides a good solution.