The warp speed is adjusted to achieve constant delivery

Update:14-11-2019
Summary:

The warp knitting machine is mainly composed of a weavi […]

The warp knitting machine is mainly composed of a weaving mechanism, a bar traverse mechanism, a let-off mechanism, a pulling take-up mechanism and a transmission mechanism. The warp knitting machine control system mainly includes three parts: electronic let-off system, electronic jacquard system and shuttle traverse system. The main function of the electronic let-off system is to control the speed and tension of various yarns to ensure constant delivery. The electronic let-off system can be divided into single-speed or two-speed EBA and multi-speed EBC. It uses PLC, inverter, three-phase asynchronous motor, servo motor, encoder and other components to form closed-loop control to achieve constant speed operation of the spindle. The warp speed is adjusted to achieve constant delivery. The electronic jacquard system is mainly used for the extraction of flower patterns, and then the traverse of the shuttle knot to realize the shaping of the flower pattern.

It mainly implements the conversion of jacquard data and the motion control of jacquard by an embedded system. The execution action is realized by 3146~4096 solenoid valves. Due to the slow response of electromagnetic action, it is now slowly replaced by piezoelectric ceramics with fast response. The shuttle traverse system mainly controls the movement of the shuttle. The warp knitting machine has 56 or 40 shuttles, and the current maximum is 56. Each shuttle is controlled by a 900W servo. Due to the large number of control axes, decentralized control is used.

The upper monitoring is completed by an Advantech touch panel TPC-1261 with monitoring software. At the same time, the computer also runs a woven flower conversion program to convert and download the pattern data. Complete the monitoring of the running status of the whole system, including the running status of the servo, the communication status of the PLC, the servo, the shuttle number of the pattern running, etc.; the parameter setting of the system is completed: the mechanical parameters are mainly the spindle parameters. The motion parameters are mainly for the pulse frequency, filter time, acceleration and deceleration time, etc. for PLC positioning control; in addition, the functions of process pinning, fault handling, pan head control, user management, and help are completed.

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