Straight wire drawing machine principle

Straight wire drawing machine in the control of frequency control with the configuration concise, logical, cost reduction features, while this article also detailed in the drawing machine Huichuan MD320 drive the application.
Key words directly into the wire-drawing machine synchronous frequency control
1 Introduction
Metal products in the metallurgical industry is an important part of the industry in China is a weak link, machinery, electrical equipment obsolete, hindering the development of the industry. In metal processing, Straight wire drawing machine is a common, usually used in the previous DC generator - motor group (FD system) to achieve, and now with the technology progress and drive a lot of popularity, frequency control Start the Straight wire drawing machine in heavy use, and can be achieved by drawing Variety PLC, the operation automation, process control, real-time closed-loop control, automatic meter functions.
Frequency Control System with straight wire-drawing machine with advanced technology, energy saving significant work in the normal speed range is 30:1, while 5% of the rated speed to provide more than 1.5 times the rated torque.
In this paper, a factory producing stainless steel wire drawing machine straight into the frequency transformation, for example, to illustrate the application of frequency control process and results.
2 Straight wire drawing machine frequency control system
The Straight wire drawing machine mainly for finishing out of the stainless steel wire drawing, the design process requirements: (1) Maximum drawing speed 600m/min; (2) processing varieties are three types of Line 2.8mm → Outlet 1.2mm, 2.5mm → 1.0mm, 2.0mm → 0.8mm; (3) emergency stop breakage than 2.
Straight wire drawing machine wire drawing machine is the one most difficult to control, because it is more than one motor while the tensile wire, high efficiency operation. Unlike previous water tank frequently encountered type drawing machine drawing machine and looper, allowing the mold metal wire between the various road skid. While its synchronous motor, and fast dynamic response have higher requirements. Comparison of the brittle material properties of stainless steel, the lack of high-carbon steel wire or steel cord like that kind of toughness, the process easier to pull off the job.
This system is a total of 8 11KW inverter. The electrical system is configured to loop one, installed in the first stage, the role of Rolls of stainless steel wire drawn to the drawing part, due to free spin loop, so this motor does not require special control. Drawing some six 400mm diameter drum. Each drum is installed between the cylinder arm is used to detect the location, the use of displacement sensors can detect the location of the arm, when the strands tight grip when the wire arm of the cylinder will make the arm above the downward pressures on . Eventually winding motor, the sliding of the cone part is self-support, the whole process does not change the basic paper path, so do not use the coil diameter calculation function. Eight special motor variable frequency motor power, while with a mechanical braking device.
Straight wire drawing machine logic control system is more complex, a variety of linkage between the PLC implementation. Synchronization aspects of control are all in the Kymmene MD320 drive internally and not rely on external control.
Its working principle is: According to the operator decided to work on the panel to set the speed, the speed of the analog signal into the PLC, PLC, after considering the time rate of plus or minus the slope of the output according to some of the analog signal. The main purpose of doing so is to meet jogging, wearing silk and some other operating needs. PLC output analog voltage signal while receiving all the frequency of the AI2 (AI1 also) input, as the speed of the main reference signal. The arm position sensor signal access to the corresponding drum drive inverter as a PID control feedback signal. Under the arm in the middle position, you set the value of a given PID. The system is very typical of the PID with feedforward control system, a string level, PID, as the amount of fine-tuning.
Chose Kymmene MD320 drive, is that it can easily increase the main rate to follow the fine-tuning the function of PID, but no additional control panel. Parameters in this system are as follows:
F0-03 = 2: the main frequency source X is AI2
F0-04 = 8: Auxiliary frequency source for the PID Y
F0-07 = 1: Select the main frequency of the source frequency source auxiliary frequency source X + Y
FA-00 = 0: PID reference source to the given numeric keypad
FA-01 = 4: PID set value (the value of the reference value is the amount of feedback systems)
FA-02 = 0: PID feedback value of AI1
FA-03 = 0: PID direction of action (when PID feedback signal is greater than the given time, requiring the inverter frequency output decline, to achieve a balance PID)
FA-05 = 25: PID P-value
FA-06 = 1: PID's I value
FA-07 = 0.08: PID of the D value
FA-08 = 0.1: PID? The sampling period
FA-09 = 0: PID deviation limit
Because the system depends largely on the stability of the PID function, so setting its parameters must be considered thoroughly, in the low-speed, high-speed, acceleration and deceleration, etc. are taken into account. Also in this system must be added to the differential limiting.
3 Conclusion
Optimization of parameters in the system, the device test machine speed 600 m / min is very stable, completely solve the original board high-speed synchronous instability following issues (the original only open to 300 meters / min). Comparison test through a variety of conditions, and the use of imported drawing machine DC drives, like performance, while 90-95% efficiency equipment, energy-saving rate of 40%. And electrical components of the system configuration concise, logical, compared with the original there is a large cost reduction, is indeed a cost-effective advantages.