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Overall control mode of wire mesh weaving machine

Weaving machine warp yarn operation mode

The original machinery operates intermittently, meaning that the warp stops moving every time the weft is being ejected.

After the renovation, the continuous operation of the warp thread is adopted, which requires the real-time calculation of the warp thread running speed based on the spindle speed and weft density, and the conversion of it into positioning instructions for the winding motor. In other words, the winding servo works in position mode.

An encoder needs to be installed on the main shaft to detect the angle of the main shaft in real time, in order to determine the timing of the actions of the reed, the sword rod and the selvedge aligner, and to determine the position at which the winding motor needs to run. In the ideal mode, when the reed runs from the midpoint to the maximum open position, the warp speed should be slowed down, and when the reed runs from the maximum open position to the midpoint, the warp speed should be accelerated, so as to reduce tension fluctuations.

Weaving machine tension control mode

The original machinery used counterweights to adjust tension and converted the up and down movement of a floating roller into a real-time change in the mechanical transmission ratio to control tension.

According to customer requirements, the tension control accuracy needs to reach 2%, but using open-loop tension control mode can only reach 5%. Therefore, closed-loop tension mode is required, which means installing tension sensors. As it is not possible to detect the tension of a single warp yarn, the original floating roller needs to be fixed, and a through-shaft tension sensor needs to be installed to detect the total tension of all warp yarns.

When using this method, since the diameter and direction of force of the floating roller are fixed, it is no longer necessary to calculate the diameter of the warp roller.

The feedback value of the tension sensor is collected through the A/D module of the PLC. The set tension value is used as the target value and converted into a speed command to be sent to the warp feeding motor after PID calculation. This means that the warp feeding servo works in speed mode, and of course, the pulse frequency issued by the PLC is dynamically modified to ensure the constancy of tension by adjusting the speed of the warp feeding motor.

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Overall control mode of wire mesh weaving machine

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