Detection method for needle collision of flat knitting machine
A detection method and technology of flat knitting machine, applied in knitting, textile and paper making, etc., can solve the problems of false alarm of machine head electromagnet and high cost of strike needle detection, and achieve the effects of not easy false alarm, low cost and accurate detection results.
Active Publication Date: 2013-08-07
ZHEJIANG HENGQIANG TECH CO LTD
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[0003] In order to achieve accurate detection of the vibration of the needle bed after the needle strikes, multiple vibration sensors are usually used to detect the vibration of the needle bed in the application, which results in a high cost of needle strike detection. In addition, during the reversing process of the head and the operation Sometimes it is easy to generate false alarms due to excessive vibration of the system or the action of the electromagnet of the machine head
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[0012] For the convenience of illustrating the control method of the present invention, the new automatic tracking high-speed dome camera will be described in detail below in conjunction with the accompanying drawings.
[0013] As shown in the accompanying drawings, 1. a flat knitting machine striker detection method, using the detection head resistance F 0 The magnitude comes when the nose resistance F is detected 0 greater than the limit value F 0lim Then the firing pin has occurred, at this moment, stop the machine and start the alarm, and detect the head resistance F 0 The method is to use the formula F 0 =F-J(dw / dt), the calculation formula after discretization is F 0 =Fn-J(W n -W n-1 ) / T, where, where F is the servo torque, F 0 is the resistance such as the friction force of the machine head, J is the moment of inertia constant converted to the motor shaft end, w is the motor speed, t is time, and T is the time interval between the (n-1)th and nth times, usi...
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The invention discloses a detection method of the needle collision of a flat knitting machine, which comprises the following steps of: judging whether needle collision happens by detecting the size of the resistance F0 of a machine head, when the resistance F0 of the machine head is larger than a limiting value F0 lim, juding that the needle collision happens, for the moment, shutting down the machine and starting alarm; detecting the resistance F0 of the machine head by using a formula F0=F-J(dw / dt); and after dispersing, a computational formula F0=Fn-J(Wn-Wn-1) / T is used, during needle collision, detecting the resistance of the machine head by using the formula F0=Fn-J(Wn-Wn-1) through the attribute of greatly increased resistance suffered by the machine head during the needle collision, wherein the detection is carried out directly specific to the resistance F0 suffered by the machine head, therefore, the detection results are more accurate and the false alarm phenomenon is not easy to happen; meanwhile, the detection on the F0 suffered by the machine head is calculated on the basis of output parameters of a servo motor in a servo motor driver. The needle collision can be detected without adding the hardware cost, therefore, the cost is lower.
Description
technical field [0001] The invention relates to a knitting device, in particular to a flat knitting machine, in particular to a method for detecting a striker of a flat knitting machine. Background technique [0002] As a kind of knitting equipment, the flat knitting machine requires high accuracy of the machine head. If the positioning of the machine head is not accurate during operation, the phenomenon of needle strike will occur. If the pin strikes, it should be shut down as soon as possible and the fault should be eliminated to avoid greater losses. At present, in order to detect whether a needle strike occurs on a flat knitting machine, a commonly used method is to install a vibration sensor on the needle bed. When a needle strike occurs, the needle bed will vibrate. When the vibration sensor detects that the vibration of the needle bed exceeds the standard, it is considered that a needle strike has occurred. At this time stop and call the police. [0003] In order to...
Claims
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IPC IPC(8): D04B35/18
Inventor 胡军祥马晓伟
Owner ZHEJIANG HENGQIANG TECH CO LTD