Dyeing Machine Control Technology Is One Of The Key Factors In The Textile Production Process.

< p > dyeing machine control technology is one of the key factors in the production process of < a target= "_blank" href= "http://www.91se91.com/" > textile < /a > product. The traditional dyeing machine control technology basically adopts manual monitoring and manual operation mode, often causing defects such as chromatic aberration, color flower and streak, which reduces the fabric grade and increases the dyeing rate, and the quality and stability of the product can not be guaranteed.

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In order to improve product quality and stability, SCM and relay control system gradually replace manual control. < p >

However, due to the use of a large number of relays, the system controls many contacts. Because the dyeing equipment works in a humid corrosive environment, the failure rate of the control system is high, and the maintenance cycle is long. Only a simple sequence control function is implemented, and the control function is single.

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< p > automatic control system used in some advanced dyeing equipment restricts its application in small and medium-sized enterprises due to high cost and complicated operation.

The construction of overflow dyeing machine control system with S7-200PLC can improve the function and performance of dyeing machine, and gradually improve the automation level of dyeing and finishing enterprises.

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< p > < strong > overflow dyeing machine control system < /strong > < /p >

< p > fabric dyeing production process includes water entry, cloth feeding, dye addition, heating, cooling, heat preservation, sampling, washing, drainage, and cloth discharge.

The overflow dyeing machine adopts the overflow principle, and the dye solution is heated by the heat exchanger at the bottom of the impregnation trough and then enters the overflow tank after heating. The overflow pipe is arranged with an overflow pipe inlet. When the dye liquor is filled with the overflow tank, because of the difference between the upper and the lower liquid level between the dyeing tank and the dye bath, the dyeing liquid flows into the overflow pipe to drive the fabric into the dyeing tank and circulate to achieve the purpose of dyeing.

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< p > overflow dyeing machine control system functions include: temperature detection function; can be imported through a TD200 text display input different dyeing process stored in PLC; important fault alarm function; emergency stop function; basic self check function; prevent malfunction function; extensibility, through the expansion module with the upper computer's human-machine interaction interface to set and adjust the parameters in detail; use MPI communication network to carry out the dyeing process under the pmission and on-site signal back.

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< p > < strong > controller selection < /strong > < /p >.

< p > PLC is specially designed for industrial control. It has strong anti-interference ability. Generally, it can be used directly in industrial environment without any special measures.

The controller of the control system selects SIEMENS's S7-200 series CPU226XM.

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< p > according to the O cylinder structure chart of overflow dyeing machine, it can be concluded that the I/O points needed for the system are DI16, DO28 and AI2 respectively.

For a controlled object, the number of I/O points used will not change easily. But considering the modification of process and equipment, or the damage and malfunction of I/O module, 1/8 allowance should be retained.

Therefore, in the CPU selection of PLC, the system uses CPU226XM with 24 point DI and 16 point DO. The output expands two EM222 with 8 DO. For the analog input of two temperature, the system expands EM231 with two analog inputs.

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< p > dyeing machine heating valve, condensing valve, cooling valve, cooling water valve, pressure valve, relief valve will work more frequently, especially the relief valve, so the output interface circuit of PLC uses pistor output.

The output interface circuit of the two extension module EM222 uses relay output.

The system is connected with a TD200 text display to display some operation information in the dyeing process, which is suitable for all SIEMENS S7-200 series PLC.

The TD200 connection is very simple. The researchers only need to connect the cable they provide to the PPI port of the S7-200 series PLC, without the need of a separate power supply.

The system uses MPI network to communicate with the host computer, and can connect 32 nodes at most. The common PC is connected to the MPI network through CP5611 communication card, and each PLC is connected to MPI network through EM277.

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< p > < strong > control software system < /strong > < /p >.

< p > control software adopts modular structure design, and the dyeing process is decomposed into different steps. This will be more logical and easy to use and maintain.

S7-200 programming adopts SIEMENS's STEP7-MICROWIN32 software package. The software runs in WINDOWS environment with friendly interface and convenient programming.

The control program of PLC mainly consists of main program, water entry, cloth feeding, dye adding, heating, cooling, heat preservation, sampling, washing, drainage, outgoing cloth, communication and other subroutines. Whether each subroutine is executed or not depends on the dyeing parameters under the network.

According to the characteristics of sequential control, this study divides the dyeing process into several steps. Each step may include functions of water entry, cloth feeding, preparation and feeding. In the PLC, a memory area Xi for storing single step dyeing process under the network is opened, and I represents I step (i= 1,2,3...

At the same time, the control action is completed at the same time, the flag bit is completed, the M0.0 position indicates the completion of the water entry, the M0.1 position indicates the completion of the cloth insertion, and when M1.0 to M1.3 is all set, it means that the current step has been executed.

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< p > control system software experiment is completed by combining debugging board with text display.

The debug board is used to simulate all the input signals of the system. In this study, the MPI interface is used to form a small PLC communication network to input the dyeing process parameters. The text display is used to display the output state, fault codes and other kinds of information, so that the communication parameters can be set conveniently.

At present, the system has completed the commissioning of the laboratory.

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< p > on the basis of the above theory and design, the overflow dyeing machine control system composed of S7-200 can achieve good control effect in practical application. The system makes full use of the advantages of simple and reliable S7-200PLC programming and quick and convenient parameter setting, realizes the control of dyeing process through programming, improves the stability of dyeing and automation of the system, makes the control system more stable and reliable, and at the same time, the system is easy to operate, and the operator can grasp the whole operation process in a relatively short time.

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