Active pay-off system with variable thread speed and constant tension

Abstract

The invention provides an active pay-off system with variable thread speed and constant tension. The active pay-off system with variable thread speed and constant tension comprises a platform, a thread tray, a motor drive device, a thread pressing rod, a double-guide-wheel thread tightener, a shaft angle sensor, a guide wheel, a tension controller, a thread guiding rod and a pay-off tension control system. The motor drives the device to drive the thread tray to rotate, a silk thread is wound on the thread tray, the silk thread drawn from the thread tray passes through the thread pressing rod so as to form a wrap angle and enters the double-guide-wheel thread tightener, the silk thread is drawn from the double-guide-wheel thread tightener and then passes through the guide wheel so as to enter the tension controller, and the silk thread passing through the tension controller is drawn through the thread guiding rod. According to the active pay-off system with variable thread speed and constant tension provided by the invention, through the joint action of the motor drive device, the double-guide-wheel thread tightener and the shaft angle sensor, the closed-loop control of the pay-offspeed can be realized. Compared with a passive pay-off system characterized by fixing the thread tray on a non-driving device, active pay-off can be realized, and the control system controls the drivedevice to actively adjust the pay-off speed according to an angle value detected by the shaft angle sensor, so that the occurrence of thread breaking or silk thread loosening can be prevented.

Description

technical field [0001] The invention relates to an active pay-off system with variable wire speed and constant tension, which is used for constant tension wire transmission equipment with fast wire speed and large variation in wire speed, and can adapt the wire speed during wire transmission to maintain wire tension constant. Background technique [0002] During the preparation and use of the wire, it is necessary to guide and transport the wire. In some cases, the speed of the wire-releasing end and the wire-receiving end may not be consistent at all times, and the tension of the wire between the wire-releasing end and the wire-receiving end will increase. Fluctuation occurs, and if the fluctuation is large, there will be two situations of thread breakage or thread slack. To this end, a self-adaptive pay-off system is needed to change the pay-off speed in a timely manner so that the tension of the wire at the outlet end can be kept constant, and then play a role in tension...

AI Technical Summary

Problems solved by technology

[0005] However, the diameter of the polarized wire grid in this document is only Φ500mm. When the diameter of the polarized wire grid is expanded to Φ1500mm, the size of the rotating frame is also enlarged (the rotating frame is used to install the fixed wire grid ring, and it rotates with the wire grid ring. Its size must be greater than the overall size of the wire grid ring), if it rotates at the same speed, the speed change range will increase by 3 times, and the tension controller alone cannot meet the requirements, because the speed change range is too large, exceeding the tension controller The range of control capability (the response speed cannot keep up, the inertia of the wire reel is too large), there will be problems of thread breakage or thread slack

At this time, the conventional solution is to reduce the rotation speed of the rotating frame, but the result of this is to cause the low-speed crawling phenomenon of the screw nut transmission pair of the cable arrangement mechanism (the ratio of the moving speed to the rotation speed of the cable arrangement mechanism is constant), crawling vibration In turn, the accuracy of the wiring is deteriorated, and the error of the pitch of the wires is increased or even out of tolerance, which cannot meet the requirements of the wire grid for the accuracy of the pitch of the wires.

At the same time, the reduction of the speed also makes the winding time longer and the winding efficiency is reduced.

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