Weld seam tracking device

Abstract

The invention belongs to the technical field of welding and particularly relates to a weld seam tracking device. The weld seam tracking device comprises a weld seam tracking device body and further comprises a control system, a servo motion system, a welding system and a weld seam tracking system, wherein the servo motion system, the welding system and the weld seam tracking system are electrically connected with the control system. The welding system and the weld seam tracking system are arranged side by side. The weld seam tracking system comprises a diffuse reflection optical fiber and an optical fiber amplifier arranged on the diffuse reflection optical fiber. The diffuse reflection optical fiber is composed of multiple optical fiber heads. Each optical fiber head independently emit light and the light is transmitted to the control system through the optical fiber amplifier. The control system acquires the positions and depths of weld seams of workpieces to be welded. By the adoption of the weld seam tracking device, the weld seam width and the depth information can be identified accurately, and meanwhile the measurement numerical values are fed back to the servo motion system for tracking the directions of the weld seams, so that the welding quality is improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a welding seam tracking device. Background technique [0002] In automatic servo welding occasions such as robots, in order to overcome the influence of uncertain factors such as weld size and section inconsistency on welding quality and improve the reliability of automatic servo welding, it is necessary for automatic servo mechanisms such as robots to be able to adjust the position online in real time to ensure that the welding torch is centered and welded seam center to ensure the quality of weld seam formation. At present, seam tracking usually uses sensors for detection, and then uses a closed-loop servo system for real-time tracking. Welding sensors can be divided into three categories: direct arc type, contact type and non-contact type. The contact sensor generally uses a guide rod or a guide wheel in front of the welding torch to contact with a side wall of ...

AI Technical Summary

Problems solved by technology

It is characterized by no arc interference, reliable operation and low cost. It has been widely used in production, but the tracking accuracy is not high.

As a real-time sensing device, the direct arc sensor has the characteristics of simpler structure, low cost and fast response compared with other types of sensors, but the disadvantage of the arc sensor is that it is difficult to track the butt joints and lap joints of thin plate parts , and it is impossible to know the size of the welding cross-sectional area; and the vision sensor, due to the slow image processing speed and various strong interferences such as welding light, arc heat, spatter, and smoke, cannot accurately track in real time

Due to the high precision and good anti-interference performance of laser measurement, the robot welding tracking sensor made by combining it with CCD has been applied, but the price is generally more expensive

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