Controlling method of strip steel parallel adjustment device for welding machine

Abstract

The invention discloses a controlling method of a strip steel parallel adjustment device for a welding machine. The method comprises a small loop controlling method including the following steps: sending a command for making upper channel small loop to a unit; making the small loop, and monitoring making time of the small loop of the unit; ensuring that the strip steel small loop quantity is more than 500mm; completing the making of the small loop; not sending an ascending action command of a small loop roller any more by the welding machine if the making of the small loop is completed in preset time, otherwise sending an ascending command of the small loop roller by the welding machine and alarming; and descending an entrance small loop; and descending the entrance small loop in place. According to the controlling method of the strip steel parallel adjustment device for the welding machine, good strip steel welding joints can be provided for the unit, and the halt failure of the unit is reduced.

Description

technical field [0001] The invention relates to a production control method, more specifically, to a control method for a welding machine strip parallel adjustment device. Background technique [0002] Such as figure 1 As shown, the existing hot-dip galvanizing unit welding machine equipment includes three sets of parallel adjustment devices for strip steel at the upper and lower passages at the entrance and at the exit [each set has a pair of parallel adjustment devices (abbreviated as P.A.D), and the structure of each parallel adjustment device is as follows Figure 6 Shown], entry / exit clamps, entry / exit pinch rollers, welding machine body and other equipment, according to the sequence of the process flow, from front to back are: exit looper 1, exit second strip parallel adjustment device 2 , Exit pinch roller 3, crescent shear 4, exit first strip parallel adjustment device 5, welding machine 6, entrance upper passage second strip parallel adjustment device 7, entrance u...

AI Technical Summary

Problems solved by technology

[0008] 1. Since the control of the small looper of the strip parallel adjustment device adopts the "synchronous control" mode, the time for the unit to start the small looper includes the closing time of a straightener and the delay time of the fieldbus (FL_NET) network transmission command, etc. , due to the uncertainty of these times, the failure of the automatic step timeout at the entrance of the welding machine often occurs. After the steel is welded, the strip forms a severe camber shape at the weld (the severity of the camber shape depends on the state of the pinch rollers in the entrance section), and the camber-shaped strip weld is prone to deviation when passing through the furnace Phenomenon, the unit has to slow down production, when the deviation is serious, the strip will rub the edge and cause the unit to stop

[0009] 2. Since the strip steel parallel adjustment device cannot be put into normal operation, the weld seam of the strip steel formed by welding becomes a sickle shape, and it is also very easy to cause the failure of the single-side shear of the disc shear. The production of finished products has caused a great impact on the logistics of the cold rolling mill

[0010] 3. The "inertial control" mode is used for the backward movement control of the strip parallel adjustment device, which will make the joint surface between the strip parallel adjustment device and the off-line sensor less than 1 / 3, causing the signal light of the sensor to be "yellow" (normally it should be "green"), indicating that the sensor is in an unstable state

And many times the signal of the sensor was lost instantaneously, and the inlet section of the unit shut down due to the loss of the welding machine "HOME POSITION" (original position) signal. Shutdown seriously affects the stable operation of the unit

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