In PLC and ac servo device in the application of warp knitting machine

1 the introduction of traditional textile industrial process including fiber, weaving, finishing and garment four parts. Weaving process including woven, knitted, woven and nonwoven. Knitting is divided into warp and weft. Warp knitting with a group or several groups of parallel arrangement of yarn, on all the work by the feeding machine needle, into a circle to form a knitted fabric at the same time, this method is called the warp knitting, formation of the knitted fabric called warp knitting fabric. JingBianYe in China after decades of development, and constantly the structural adjustment, especially in recent years, emerging regional warp knitting enterprises high starting point, reasonable product structure, scale, universities and research institutes of scientific research strength of injection, and the combination of production, make the warp knitting industry in China got rapid development, is gradually becoming a world center of warp knitting industry. Traditional warp knitting machine for chain type warp knitting machine, due to its for spindle mechanical transmission structure, there is no import electric drive, caused by the following disadvantages: damask slow, low efficiency; Complex chain institutions, each change a pattern, it takes more time, and each pattern corresponding to a kind of chain blocks, change the pattern of time long, the cost is high. Due to small batch order lose production significance; Because of the complexity of the institutions, making complex pattern cannot on the chain block machine for production. Only fabrics production pattern is relatively simple, can't meet the requirements of more and more high, at present, the total servo warp knitting machine has gradually been applied in textile. Now total servo warp knitting machine in yield, efficiency, design diversity, have good advantage on the product quality, thus will become the mainstream of future jacquard weaving. 2 total servo warp knitting machine system architecture. 1 system architecture ( FIG. 1) Figure 1 total servo warp knitting mechanical and electrical control system architecture 2. See table 1 2 system configuration system configuration table 1 total servo warp knitting mechanical and electrical control system configuration 1 control part. System USES DVP80EH00T + DVP08HN00T + DVP08HN00T + DVP08HN00R do main controller system integration, lateral movement of the signal acquisition and synchronization again sent to the controller ( DVP32EH00T） , the system controller is a total of 28 DVP32EH00T, each component control section two axis spindle servo controller. Controller and the servo respectively through the RS485 communication to PC, monitor. Part 2 driver. Article 56 the spindle system section, sets up to 56 by ASD - A750W servo control, servo motion according to convert good damask conversion program in advance is stored in the pattern data in the controller action. Part three monitoring. Upper monitor part by a touch-screen tablet computer research China TPC - 1260, match with monitoring software to complete; At the same time on the computer running damask pattern conversion program pattern data conversion and download. 3 total servo warp knitting machine mechanical structure and working principle of the total servo warp knitting machine mainly includes the electronic let-off system, spindle section transverse system, electronic jacquard system of three parts. 3. 1 electronic let-off system of electronic let-off system main function is to control all kinds of yarn let-off mechanism of speed and tension control, not sending yarn, yarn breaking caused to damask. The system is mainly composed of 3 sets of servo + PLC to realize its function. 3. Section 2 spindle spindle section transversal transverse system consist in PLC, ASD of system, is also part of this paper mainly introduces. As shown in the block diagram of the system. Section of the warp knitting machine spindle generally have in article 56 or 40, is currently the most article 56. Each spindle section by a 750 w servo control. Because the control shaft number too much, the decentralized control is adopted. Spindle section transverse system mainly has two key points: 1 each spindle section of the transverse velocity and precision. Warp knitting machine spindle speed to 400 RPM, lateral movement spindle turn every week to action, and action time only a third time to complete, otherwise the transverse failure. 2 designs is data conversion. As a result of the damask pattern is generated by textile CAD software. System needs to be the relevant pattern of textile CAD generated data into a data of PLC controller can identify, and control the spindle section transversal. The current system USES VB wrote a pattern conversion software to complete the automatic conversion of design data and the data download. System currently used in EH series PLC as the controller, servo EHPLC good positioning function, abundant internal data resources, and seamless communication function of servo. Make the control and drive together, the two together, make the system better. 3. 3 electronic jacquard system are mainly used for electronic jacquard system pattern extraction, coupled with transverse spindle section in order to realize the pattern shape. It mainly consists of an embedded system to implement: jacquard data is transformed and the action of jacquard control; To perform an action by 3146 - 4096 solenoid valve. Due to the action of electromagnetic response speed slower, now slowly being replaced action fast response of piezoelectric ceramic. In addition to control and drive the whole system, has a good man-machine dialogue. This is mainly by the touch of a computer research China TPC - 1260 to complete, the computer operation monitoring software and damask conversion program. 4 4 monitoring software function design. 1 monitoring the running state of the whole system monitoring system operation, the operation of the servo, PLC, servo state of communications, pattern running spindle section number, and so on running state. 4. 2 parameters set up complete system setup: mechanical parameters, kinematic parameters. Mechanical parameters is mainly the main shaft, used for transverse track; Motion parameters is mainly for positioning control of PLC ( Pulse frequency, the filter time, deceleration time, etc. ) 4. Three process needle the function is to realize the spindle section of the initial injection.
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