Suspension-type resistance spot welder connection cable real-time on-line monitoring method and device

Abstract

A suspension-type resistance spot welder connection cable real-time on-line monitoring method and a device for the same belong to a metal welding technology field. The invention is based on the Ohm Law, and the purpose of real-time detection is realized through carrying out real-time on-line monitoring welding current and cable pressure drop and then through analog-digital conversion with high precision and high frequency carried out by a microcomputer and accurate calculation; by using the method and the device provided in the invention, damage can be discovered timely when suspension-type resistance spot welder cable begins to damage; alarm can be carried out timely, and the operator can be informed to replace the cable. A few elements are used in a circuit of the invention, and the method and apparatus provided by the invention are advantaged in low cost and adaptability to different welding standards, and the volume of the device in the invention can be further made compact. The device is convenient for installation and can be further added in the condition of not changing a current spot welding controller. A workpiece reject rate is reduced, and good economic benefits are bought out. By using the method and the device provided in the invention, spot welding parameter network monitoring can be realized in welding-assembly workshops, or a portable measuring device can be made by using the method and the device to improve product quality of automobile welding and management level of automobile welding workshops.

Description

technical field [0001] The invention belongs to the technical field of metal material welding equipment, and in particular relates to a real-time on-line monitoring method and device for a connection cable of a suspended resistance spot welding machine in an automobile welding workshop. Background technique [0002] Resistance welding is widely used in automobile production, and there are hundreds of suspension spot welders in general welding workshops. During the process of welding the automobile body, the specification parameters of these spot welders will be unstable due to the wear and tear of the cables. , the result is that the size of the weld nugget is insufficient, the connection strength decreases, and even the weld nugget cannot be formed, which affects the quality of the product. Therefore, the quality of this type of product depends on the quality of the welding. If the welding quality is stable, the quality of the product will be stable. Suspended resistance sp...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to use the single-chip microcomputer system to monitor the wear and tear of the connecting cable of the hanging resistance spot welding machine in the welding workshop in real time. When the connecting cable is damaged and has affected the welding quality and can no longer be used, it will alarm in time and notify the operator to replace it.

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