Brief description of high-speed tufting machine principle and servo solution

In modern society, teeth have become a symbol of health and beauty, and the demand for toothbrushes is gradually increasing. At present, the global annual demand for toothbrushes has exceeded 9 billion, and is increasing at a rate of 10% per year. China has a large population, and the demand for toothbrushes is quite large as a necessity of modern life. Although the toothbrush is small, it is a big commodity with huge consumption and a mature market. With the improvement of the quality of life, the quality of the toothbrush is also improved. The production efficiency and production quality requirements of high-quality health care toothbrush equipment have promoted the equipment development of high-speed toothbrush tufting machines. .

In the past, toothbrush equipment manufacturers mostly used the same brand of single-chip microcomputer control system and servo motor electronic control system, and most of the servo systems used imported products from Japan. In recent years, with its excellent performance and competitive price advantages, Delta's servo products have increased its share in the high-speed toothbrush tufting machine industry year by year.

Brief description of the principle of toothbrush hair transplanting machine:

The transmission structure of the high-speed toothbrush tufting machine is composed of the main drive shaft and four servo drive shaft systems. The four servo axes are horizontal X axis, vertical Y axis, flap Z axis and molt U axis. The XY two-axis coordinates determine the position of the toothbrush hole, the Z-axis plays the role of changing to the next toothbrush, and the U-axis plays the role of changing the hair color of the toothbrush. When the main shaft motor is running, the four electronically controlled servo axes will run accordingly, and when the main shaft stops, the other four axes will stop accordingly. The speed of the main shaft determines the speed of the hair planting, and the four servo axes respond to the requirements of coordinated drive, otherwise there will be hair removal or uneven hair. Applying the high-precision electrical servo control of Foshan MX brushmachinery Machinery Factory can achieve a hair planting speed of 1000 times/min, and can achieve jumping hole hair planting.



Zhongda Servo Solution

1 Program planning

At present, the structure of the electrical control system of the tufting machine is mainly divided into a single-chip microcomputer control system or a CNC numerical control system. Among them, the single-chip microcomputer control system is mainly based on the integrated supporting services of automation system manufacturers, and the independent research and development of toothbrush equipment manufacturers is supplemented. Most of the CNC numerical control systems with superior performance are Delta's PUTNC-H2P and imported brands such as Europe and Japan.

CNC numerical control is mainly to control axis pulse command signal to realize servo drive, usually four-axis control output is realized, Delta's CNC only needs two-axis output to realize, and the servo of the other two axes can be completed independently, toothbrush tufting machine requires system Two-axis interpolation operation can be realized. The four sets of servo drives are Zhongda's B series ASDA-B AC servo system, with a power of 400W, and the drives have multiple functions to control. The inverter model of the spindle motor is Zhongda's VFD-S, with a power of 400W.

2 Debugging points

The difficulty in the development of the servo solution is the joint debugging of the electromechanical system, which is mainly the adjustment of the servo gain. Among the four servo axes, the X-axis and Y-axis have relatively stable mechanical inertia due to the screw drive structure, so debugging is relatively easy, and the bandwidth can generally be adjusted to more than 130HZ. The Z-axis of the flap is a rotating shaft, and there is centrifugal force in high-speed rotation. If the bandwidth is simply set high, the motor will vibrate when it starts and stops. At this time, the position smoothing filter parameter can be turned on to eliminate the vibration.

Relatively speaking, the mechanical structure of the cam mechanism of the hair-changing U-axis makes debugging more difficult. In addition, the mechanical rigidity of the U-axis is not good. When the motor is running, the inertia ratio changes greatly, and the output current of the motor also changes greatly. Well, this shaft is either vibrating or whistling or unresponsive when the motor is running side to side. For this reason, it is necessary to apply the resonance suppression function of the B series ASDA-B AC servo system.

When the low-pass filter (P2-25) is increased from 0, B.W. will become smaller and smaller. Although the resonance problem is solved, the system response bandwidth and phase boundary are also reduced, and the system will become more unstable. If the resonance frequency can be known, the band rejection filter (P2-23, P2-24) can directly reduce the resonance Quantity eliminated. Usually knowing how much resonance suppression is, the effect of using a band-rejection filter will be better than a low-pass filter, but if the resonance frequency will drift with time or other factors, and if the drift is too far, then it is not suitable to use a band-rejection filter . The problem caused by the operation of the U-axis of the equipment in this project is that the resonance point is floating. The effect of using the P2-25 low-pass filter is better, and its parameters are set to a large value. In addition, the position accuracy of this axis is not too high, so the problem is solved. .

This article is published by Foshan MX brushmachinery Machinery Factory, URL/

The company's main products are: tufting machines, brush making machines, drilling machines, high-speed tufting machines and other mechanical equipment. Service hotline 0757-86407589
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