Electrical control system and synchronizing device for three-strand tire cord straight twisting machine

Abstract

Provided are an electrical control system and a synchronizing device for a three-strand tire cord straight twisting machine. The electrical control system comprises a programmable logic controller (PLC), the PLC is electrically connected with a plurality of spindle position units, single-chip microcomputer controllers are arranged in the spindle position units and electrically connected with the PLC, the PLC is electrically connected with a spindle frequency converter, the spindle frequency converter is simultaneously electrically connected with a first permanent magnet synchronous motor of a first spindle and a second permanent magnet synchronous motor of a second spindle, the first permanent magnet synchronous motor and the second permanent magnet synchronous motor are simultaneously driven by the spindle frequency converter to synchronously rotate, the speed is set by the PLC, and a starting and shutdown mode is controlled by adopting I / O contacts. The two permanent magnet synchronous motors are driven by adopting the spindle frequency converter, the twisting speeds at the two spindle positions are always consistent, the twist degree of the left spindle position and the twist degree of the right spindle position are identical, the electrical control system is high in efficiency, saves energy and is green and environmentally friendly, an open-loop control mode is adopted, and system stability is improved.

Description

technical field

[0001] The invention relates to the field of direct twisting machine control, in particular to an electrical control system and a synchronizing device for a three-ply cord direct twisting machine. Background technique

[0002] Cord is mainly used as car tire frame. It requires that the strength retention rate of the cord after twisting the raw silk should be greater than 94%, and the twist deviation should be less than ±8; at present, there are three twisting methods for the 3-strand cord: the first is the traditional ring twisting method, 3 A monofilament is first twisted and then retwisted. Because it is twisted twice, its strength retention rate can only reach 90%, the output is low, and the operation is inconvenient. The second is the twisting method in which two asynchronous motors are forced to achieve the same speed through synchronous belt transmission. Since the spindle speed can reach up to 10,000 rpm, due to the inconsistent driving force in the ...

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