2.2 Overview of system functions

The system functions are summarized as follows:

(1) Control the whole spinning process with PLC, with program driving, automatic lifting of steel collar plate, automatic tracking drive after midway stop, automatic doffing, automatic head retention, etc.

(2) Set the process parameters of the spinning, and automatically control according to the process requirements; realize the control of the fixed length doffing and the spindle speed curve.

(3) Display the spindle speed, the traction multiple, the number of the spun yarn, the twist, and the cumulative production of the shift.

(4) The use of digital communication improves the anti-interference of the system.

2.3 Control features of each part

(1) Transmission part: including main motor, suction motor, steel ring plate lifting motor, oil pump motor and lubrication device, main frequency converter, lifting frequency converter, cleaner device, various low voltage switches and contactors.

(2) Three automatic detection parts: This part is composed of three automatic travel switches, main motor proximity switches, lower steel collar proximity switches and brake pads. Its function is to automatically adapt to the parking after the doffing signal is given, and automatically keep the head, creating conditions for re-driving to reduce the break.

(3) Inverter spindle speed control: This part is composed of inverter, spindle transmission part and main motor. Its function is to automatically adjust the spindle operation according to the spindle speed control ten-point curve transmitted by the program controller to improve the yarn quality and output. .

(4) Data detection part: This part is composed of main shaft and front roller speed measuring photoelectric tube. The function is to automatically detect the running data of the spindle and the front roller during the spinning process, and provide data for calculating the process parameters, spindle speed, front roller speed, front roller speed, twist and other process parameters as well as spindle speed curve control.

(5) PLC control part: This part is composed of PLC main unit and IO expansion module, completes the whole machine switch input, data detection and calculation and process control, realizes the spinning process automation and monitors the machine operation.

(6) Display unit: The connection between HMI and PLC is realized by communication line, and the process parameter display setting of the spinning process is completed. The ten-point curve of the spindle can be directly set to realize the control flexibility, and the spinning machine is running. The fault that occurred, in real time feedback in the form of a dialog box.

(7) Communication part: The parameter setting and display of the port is realized by the RS1 communication interface of the PLC through the RS232C mode and the HMI. The port 2 communication interface of the PLC controls the frequency value of the inverter through the RS485 mode, thereby realizing the control of the spindle running speed curve. The reliability and stability of the machine have been greatly improved.

3 PC software design

The upper computer control software is divided into: parameter setting display program, control main program, calculation sampling subprogram, communication subroutine and spindle running curve subroutine.

(1) Control the main program:

The software main control program part, according to the process requirements of the program, automatically detects the switch quantity and sensor input data after power-on, complete the entire spinning process automatic control and call subroutine.

(2) Parameter setting display program:

Mainly according to the DOP-B05S100 configuration to complete the parameter setting display, including shift setting, error setting prompt, total output, shift output cumulative display, spindle speed, front roller speed, traction multiple, twist, output, yarn number and other parameters display. as shown in picture 2:

Figure 2 parameter setting display interface

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