LM series PLC application in a straight line wire drawing machine is introduced

Introduction

wire drawing machine is one of the main processing equipment, metal processing industry is mainly to coarse yarn processed into all kinds of fine line, generally by the pay-off, water-cooled, take-up and other components, including electric drive part is mainly composed of drawing the line in motor and motor. By the PLC controller to realize the automatic operation of the drawing speed setting, and the production process control, real-time closed-loop control, automatic meter, etc. Through the inverter to control motor speed.

1 straight into frequency conversion control system of the straight wire drawing machine, wire drawing machine is mainly for finishing of stainless steel wire drawing, design of technical requirements for: ( 1) High drawing speed 18 m/s; ( 2) Processing varieties mainly into line Ф 6 mm to qualify Ф 2 mm ( 3) Parking there cannot be beheaded, Except for emergency stop) 。

straight into type wire drawing machine is a kind of the most difficult to control in the wire drawing machine, since it is more than one motor for wire drawing at the same time, work efficiency is very high. Is not often encountered as he used to water tank wire drawing machine and loop type wire drawing machine, allow the wire slip between each mold. Due to the relatively easy to snap in the process of operation, it synchronicity of motor and dynamic response quickness have higher requirements. This system of six drum, each drum is controlled by a frequency converter with mechanical brake device, and the line in a motor. Installed between each drum is used to detect the location of the swing arm cylinder, the displacement sensor to detect the position of the swing arm, when pulled tight silk, silk can produce pressure above the cylinder of the swing arm made within the swing arm.

2 control technology principle of the straight-line drawing machine control system is mainly divided into: point move, linkage, accelerating and braking of five parts, automatic work.

1) Points move: move into before and after. When on the foot switch at the selected control motor running at a fixed speed, make each wire wound tight on the drum.

2) Linkage, linkage can be divided into before and after the league. Before the first drum no union, 6 sets of drum, after no intermediate four drum before and after the league. When on the anterior switch, before the selected motor control and motor rotation wire together; When hit the switch when, after the selected motor control and motor rotation wire together. When the linkage, motor rotate at a constant speed.

3) Acceleration start: start with the linkage are similar, but there is no difference between before and after, when the acceleration button, choose the motor and the speed of the motor speed up before starting to set.

4) Automatically start: when the line all around the drum, press the start button, all motor accelerating together, through the inside of the PLC controller PID to adjust the speed of the motor, ensure running at high speed won't snap under the condition of silk, until the rate of setting, take-up machine run with it. When press the stop button, all motor slowdown.

5) Parking brake and stop: when condition, in order to prevent break line, all the drum is not allowed to turn. When in running state, if there is a disconnect, all of the drum to stop immediately, to prevent accidents.

3 PC control system is introduced control system adopts hollysys HT6600C series touch screen, a machine under the CPU to choose hollysys LM3109 PLC controller, through the RS485 communication between upper and lower place machine. Through the logic programming from touch screen and buttons, sensors and other signal processing, control 6 frequency converter. Figure 3 for the control system configuration diagram.

3。 Programmable controller part 1

HOLLiAS LM series PLC controller control is applied in this system, configuration 1 CPU module LM3109, 1 LM3212 16 channel digital quantity input module, an 8 channel digital output module LM3222, 1 8 channel analog input module LM3313 and three LM3320 2 channel analog output module.

2) Digital quantity extension module: LM3212 module is 16 road digital quantity input processing channel, mainly to complete the digital signal processing, digital quantity input signal of the rated working voltage of 24 VDC. LM3222 digital output module is 8 road processing channel, main contact type digital output processing work, output rated load voltage is 24 VDC or 220 vac.

3) Analog extended module: LM3313 module provides eight channel analog input channel, input range - 10 - And - 10 v voltage signal 10 - Optional 20 ma current signal, the main field of analog input, acquisition and processing work. LM3320 analog output module has 2 road processing channel, the range of 0 ~ 10 v output voltage signal or 0 to 20 ma current signal, the output of the analog signal.

table 1 for the system I/O allocation table.

3。 Part 2 monitor part of upper monitor by hollysys HT6600 series touch screen, with the monitoring software to complete. Touch screen can be set parameters, motor start-stop control and display speed and fault information, etc. Figure 4 - Figure 7 part for touch screen monitor screen. Conclusion

hollysys programmable controller, hollysys touch-screen and frequency converter, provides straight line wire drawing machine equipment with mechanical and electrical integration of system solutions, points can be moved, linkage, and automatic control, enhance the automation of the wire drawing machine. At the same time, the control system provides very high computing speed and control precision, ensure the quality of the wire drawing, has the very high reliability and cost performance, in quality assurance at the same time, the maximum reduce production cost.

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