Method and system for proportional linkage of frequency converters of pulley-type wire-drawing machines

Abstract

The invention discloses a semi-automatic method for the proportional linkage of frequency converters of pulley-type wire-drawing machines. The method comprises the following steps: obtaining pulse signals of linear velocity of adjacent two wire-drawing machines; calculating the magnitude proportion of the two obtained pulse signals; capturing the ratio of the pulse signals during dynamic equilibrium; figuring out and adjusting the operation rate of the next wire-drawing machine according to the ratio through the frequency converters; and enabling actual operation speed to be equal to computed speed so as to freely combine one to five (even n) pulley-type wire-drawing machines with wire-retracting machines. Each pulley-type wire-drawing machine comprises a motor, a frequency converter, a speed reducer, a wire bobbin for drawing wires, a wire-moving rod, a top wire-passing wheel, a mold box, a coder and the like. Through dynamic equilibrium judgment by operators, the method leaves out complex PLC programming and calculation, and can realize the free combination of a plurality of wire-drawing machines and wire-retracting machines through the conversion of external circuits. Common electricians can debug the machines according to instructions of the frequency converters and can expertly operate the machines.

Description

technical field [0001] The invention relates to a frequency converter linkage. In particular, the invention relates to a frequency converter linkage method on a wire drawing machine. Background technique [0002] Existing inverters can be divided into general-purpose and special-purpose. Most of the general-purpose inverters are only suitable for single machine control, and the functions of two or more linkages are not very complete; There are also inverters with special functions for machines, and some manufacturers have introduced inverters with comparative functions. This kind of inverter has a step forward in the function of two or more linkages. [0003] The application of proportional linkage of the frequency converter on the pulley type wire drawing machine is as follows: (1) each frequency converter is separately adjusted through a potentiometer, which can only be adjusted manually, not automatically; (2) similar to the position detection of the tension frame , the...

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Problems solved by technology

[0003] The application of proportional linkage of the frequency converter on the pulley type wire drawing machine is as follows: (1) each frequency converter is separately adjusted through a potentiometer, which can only be adjusted manually, not automatically; (2) similar to the position detection of the tension frame , the position change is converted into a voltage signal and fed back to the inverter; the disadvantages of this scheme are: limited by the installation site (the horizontal distance between the two machines is too close to install the tension frame); limited by the hardness of the wire to be tested (the wire is too thick and too hard to bend)

(3) The speed of the encoder is fed back to the PLC, and the PLC outputs a voltage signal to the inverter after calculation; for the pulley type wire drawing machine, it is feasible to install the encoder on the output shaft of the motor, but the pulley type wire drawing machine driven by the V-belt has a V-belt Slip phenomenon, installed at the outlet of the mold box is easy to be damaged by chains and broken wires, and there is no suitable installation position

The disadvantages of this solution are: complex programming and high cost. For the wire drawing industry, when changing molds, the operator has to input data to the PLC through the man-machine interface.

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