Constant tension control system of mask machine based on variable frequency transmission

Abstract

The invention provides a constant tension control system of a mask machine based on variable frequency transmission. The constant tension control system is provided with an upper computer and a constant tension control component; the constant tension control component comprises a tension sensor, a PLC, a frequency converter, a stepping motor and an unwinding shaft; the tension sensor and the frequency converter are electrically connected with the PLC respectively; the tension sensor obtains an actual tension value generated when the mask machine transmits the cloth in the production process, and transmits the actual tension value to the upper computer through the PLC; the upper computer conducts processing according to the received actual tension value and a set tension value, generates a corresponding instruction and issues the instruction to the PLC; and the PLC controls the speed of the stepping motor through the frequency converter according to the received instruction to control the unwinding shaft, the speed of the stepping motor is controlled to control the tension of the cloth in real time, the tension of the cloth can be rapidly adjusted, the problem that the adjusting speed is low in the prior art is solved, meanwhile, the tension control precision is improved, and the problem of low tension control precision in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of tension measurement, in particular to a constant tension control system of a mask machine based on frequency conversion drive. Background technique [0002] When the mask machine drives the fabric during the production of masks, when the tension is too large, it is easy to cause the fabric to stretch, deform or even break, resulting in interruption of production and affecting production efficiency; when the tension is too small, it will cause the fabric to wrinkle and deform, resulting in irregular feeding. Cause fabric accumulation, affecting downstream processes. Unstable tension will cause the coil to jump, which directly affects the quality of the finished mask. In order to ensure the production quality of masks and improve the yield rate of masks, it is necessary to add a tension control system to maintain a constant tension of each layer of fabric used in the production of masks. [0003] The exis...

AI Technical Summary

Problems solved by technology

[0004] The semi-automatic tension control system belongs to open-loop control, which requires human intervention, and the control effect is poor; although the fully automatic tension control system belongs to closed-loop control, the response of the magnetic powder brake is slow and the adjustment speed is not fast; the tension control accuracy is low and the real-time performance is poor; In addition, the magnetic powder clutch has heat and wear problems, difficult maintenance

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