High Speed Warp Knitting Machine Electronic Transverse Control System Design

High speed warp knitting machine a kind of warp knitting machines with few guide bars,finegauge and high production speed,and its products are widely used in clothing,decorative andindustrial fields. The guide bars drives the guide needle and the kintting needle to make yarncircle movement, therefore the guide bars are the most important device in warp knittingmachines. Electronic shogging system of warp knitting machine has advantages of easier tochange fabric etc. and which has already began to replace the traditional cam pattern drivemechanisms. This paper mainly studies the process requirements and shogging rule of warpknitting machine, design electronic shogging system based on the linear servo motor, anddevelop the shogging control unit based on TMS320F2812.Firstly, the paper analyzed the domestic and foreign development status of warp knittingmachine, as well as the shogging system research status, points out that the gaps of electronicshogging system. Analyzed the warp knitting process requirements by establishing the3D CADkinematic model of high-speed warp knitting machine, and shogging allows angle for differentspeed using flexible body dynamics model, and then concludes the overlap shogging time ofGB1at maximum work speed is only a few milliseconds.Secondly, discussed the feasibility of the shogging control system based on linear servomotor, and put forward the integral design of the three-level distributed control system consist ofupper-bit computer,shogging control unit and linear servo actuator. Analysis of the selectingprinciple of the motion law, and then choose the modified trapezoid acceleration motion as thewarp knitting machine servo drive curve. Then respectively selected the components of shoggingcontrol system, including the linear servo motor and servo driver, rotary encoder, grating rulerand the ways of communication. Then discussed the operation process of the shogging controlsystem.Next, it separately designed the shogging control unit from the hardware and the softwarebased on TMS320F2812, and then the overall construction of control unit. The first step ofhardware design is the DSP basic circuit design, including the DSP power source, thereplacement, the crystal oscillator electric circuit as well as the storage module and so on; Next isto design main axle feedback interface circuit based on the chosen encoder, as well as RS485 communication module design; Then the analysis the methods to enhancing the antijammingability of the shogging control circuit.Finally, it designed the shogging control program structure based on TMS320F2812, anddeveloped the corresponding function program module in the development board, such as SCIcommunication module program, followed by the analysis of the feedback principle for theabsolute angular position and speed of spindle, and developed the spindle state monitor program.At last, it designed the shogging position pulse generated procedures, and then analyzed thespecific steps of shogging control unit to transmits shogging displacement pulse.