Application case of servo on electric Han packaging machine

I. Introduction AC servo drives are used in industrial applications with high precision, high speed and high efficiency. The PSDD series AC servo drive produced by Shenzhen Research Automation Technology Co., Ltd. is widely used in automation equipment such as CNC machine tools, spring machines, drilling machines, packaging machines and knitting machines with high cost performance. At present, the research and control servo has been successfully applied to battery packaging machinery.

This application is to upgrade the performance of the old model equipment according to the needs of a packaging machinery equipment company. The device originally used the stepping drive system. Since the torque frequency characteristic of the stepping motor is a falling curve, the stepping motor Zui can only run at about 600r/min, and 270 7th batteries are packed every minute. The customer's demand is to pack more than 400 products per minute by upgrading the drive and motor to the servo system without changing the mechanical structure.

Second, the bid speed calculation When the number of labels per minute is 270, the motor speed is 600r/min. When the bidding speed reaches 400/min, it is increased by 48%. The speed of the motor responsible for the bidding also needs to be increased by 48% while keeping all the mechanical structures constant. Set the speed of the output motor after the upgrade to R, then, R=600×(1+0.48)

Third, the calculation of the electronic gear ratio Because the PLC program is fixed, can not be modified, then the frequency of the pulse command issued by the PLC is also fixed. Changing the motor speed without changing the pulse command frequency can change the number of subdivisions for the stepping system. Accordingly, for the AC servo system, the electronic gear ratio can be changed. Let the pulse command frequency sent by the PLC be H, the motor speed be R, and the electronic gear ratio be G. Then H=R/(6×G)

In the case where the electronic gear ratio G=1, the rotational speed corresponding to the pulse command frequency of 1 Hz is 6 r/min. R/6 is the value that the pulse command frequency should reach when the electronic gear ratio is 1. This value is divided by the electronic gear ratio, which is the actual received pulse command frequency. Since H is known, so

G=R/(6×H)

Fourth, the calculation of the track speed of the assembly line alone can not improve the production capacity. Because mechanical equipment is a system, simply improving the performance of some structures can cause short board effects. The short board here is the line crawler speed. If the line crawler speed is not increased, the increase in the bid speed is meaningless. Because the next workpiece has not arrived after the bidding, the bidding structure can only be in the waiting state, and the production efficiency is limited by the speed of the pipeline to transport the bare battery.

Set the linear speed of the track to V, the speed of the track drive motor to R, the diameter of the gear connected to the motor to L, the speed of the marking is N/min, the length of the label is a, and the spacing between the two labels is b, then

V=(a+b)×N

V=π×L×R

Combine the above two equations to obtain R = (a + b) × N / (π × L)

The above calculations are from a theoretical point of view. In actual commissioning, the cooperation between the bidding speed and the crawler speed still requires fine adjustment by experienced workers. When the bidding speed is higher than the crawler speed, although it can be produced normally, the bidding part needs to wait for the workpiece, and can not exert the large production efficiency of Zui, which violates the original intention of upgrading the equipment; when the bidding speed is lower than the crawler speed, the previous one The workpiece has not been wrapped, the next workpiece has arrived, and the battery is stuck into a chain by the label. The factory dubbed this situation as “making bullets”.

V. Motor Selection Currently, the research and control company has a servo drive system from 400 to 1500w to choose from. There are a variety of motors available at each power level to suit different speed, torque and load inertia. In this application, the YK80ST-M03520750w servo motor is selected for the customer, which satisfies the application requirements. This can also be seen from the subsequent parameter adjustments. The parameter adjustment of the servo system has always been a troublesome problem in the servo application, but for different applications, the detailed selection work can greatly reduce the necessity of parameter adjustment. In this application, only the electronic gear ratio has been changed, and other parameters have been kept at default values, which have well met the application requirements.

VI. Conclusion The customer is very satisfied with the capacity increase brought by this upgrade. In fact, during the debugging process, the package part has been upgraded and can easily break through 600 workpieces/min. However, it can only run at 400 workpieces/min due to the bottleneck of the front part of the pipeline. With the servo system, the increase in capacity is significant, but the increase in cost is negligible relative to the entire production line. More and more equipment manufacturers recognize the advantages of servo systems, and the application of servo systems is becoming more and more popular.

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