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Device and method for controlling length of electric arc

An arc length and control method technology, applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problem of inability to accurately reflect the arc length, and achieve strong anti-interference ability, simple parameter setting, and simple circuit structure. Effect

Inactive Publication Date: 2009-04-15
BEIJING UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

Arc voltage feedback itself cannot accurately reflect the length of the arc for piercing welding
Therefore not suitable for piercing type welding

Method used

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  • Device and method for controlling length of electric arc
  • Device and method for controlling length of electric arc
  • Device and method for controlling length of electric arc

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Experimental program
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Effect test

Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] The device includes a laser range finder 1, an AC servo motor 2, an A / D conversion module, a PLC (programmable logic controller) control unit and a control panel connected with the PLC control unit. The laser range finder 1 is installed on the welding torch frame of the welding torch 3 so that it moves synchronously with the welding torch 3 . Its function is to collect the distance between the workpiece 4 and the laser rangefinder 1. This distance can directly reflect the welding arc length (ie welding height), and the arc length is transmitted to the PLC control unit through the A / D conversion module in the form of voltage. After processing in the PLC control unit, compare the distance with the set welding distance height value to confirm the direction of rotation. By changing the pulse frequency of the PLC to change the speed of the AC servo motor 2,...

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Abstract

The invention discloses a welding-distance height control device and a welding-distance height control method. The device can accurately control the distance between a nozzle of a welding torch and a workpiece, namely the welding-distance height, and belongs to the technical field of welding. The method directly measures the distance between a laser sensor and the workpiece through a laser ranging device. The actual distance is transferred into a PLC control unit after the AD conversion; and after the processing of the PLC, the PLC can automatically select pulse frequency according to the preset speed and the difference between the welding-distance height and the preset height at the moment and output a pulse signal and a rotating direction signal to an alternating motor for servo. The alternating current motor can drive the welding torch to move back and forth, and the distance between the welding torch and the workpiece is adjusted to ensure that the distance is consistent with the preset distance. The proposal is applicable to the piercing welding, has higher control accuracy, a simple structure, and steady effect, and is superior to the prior arc voltage feedback to control the length of an electric arc.

Description

technical field [0001] The invention relates to a device and method for controlling the height of the welding distance. The device can accurately control the distance between the nozzle of the welding torch and the workpiece, that is, the height of the welding distance, and belongs to the field of welding technology. Background technique [0002] For the control method of welding distance height, the arc voltage feedback method is generally used to control the arc length, for example, the patent 200410023264.5 automatic control method for arc length of argon tungsten arc welding. In this method, the arc voltage is used as the feedback signal of the welding distance height, and the consistency of the welding distance height is guaranteed by keeping the arc voltage consistent. The main disadvantage of arc voltage feedback as a control method for arc length is low control accuracy, and it is not suitable for perforation welding. It is an indirect control method of arc length. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/095B23K9/073
Inventor 陈树君张鹏卢振洋殷树言
Owner BEIJING UNIV OF TECH
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