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Troubleshooting method of spot welding robot
browse: Release date :2017-12-05
An industrial robot used for spot welding automatic operation of the spot welding robot. The world's first spot welding machine was launched in 1965. It's the Unimate robot launched by Unimation. China developed the first spot welding robot Huayu I type spot welding robot in 1987.

1. Failure phenomenon:
Robot control, welding tongs and fixture collision and insertion jig six internal shaft continues to rotate the lead holder and the six end of the shaft flange deformation and reducer with leakage.
2. The cause of the failure is preliminarily predicted.
(1) the end flange or reducer is damaged.
The end flange M14 screws were loosened or broken.
The sealing ring of the end flange is damaged by S132 (128*2.65).
3. Treatment methods:
(1) the end flange or reducer is damaged.
Check the end flange and the external gear reducer, found no abnormal phenomenon as crack; unable to check at the end of the end surface of the flange and M14 screws, so will remove the holder, but have not yet found the end of the outer end surface of the flange is abnormal phenomenon.
The end flange M14 screws were loosened or broken.
Tighten the screw with a torque wrench, and a part of the screw is loosened.
The sealing ring of the end flange is damaged by S132 (128*2.65).
The screw M14 was unscrewed, and no breaking phenomenon was found; the end flange was gently removed, and the seal ring was found to be not in the seal groove and the seal ring was damaged. The seal ring S132 (128*2.65) has been replaced.
4, the cause of the failure:
Determine the initial robot out of control after welding and fixture collision and vibration caused bolt looseness, produce clearance, continue to move after the sealing ring is damaged, resulting in leakage.
5. The results of the test:
The robot tongs after installation of the 6 axis of the robot carry out the exercise test, 6 normal axis, no abnormal noise and leakage.
6, summary
This is mainly due to the wrist part of the oil spill, robot control, welding tongs and fixture after the collision of 6 axis running distorted due to the damage of the sealing ring, caused by non mechanical structure.
Later as the occurrence of similar collision caused by the end flange and reducer with leakage, maintenance personnel can be analyzed and the investigation from the above three factors if it is leaking possibility; M14 screw, M14 screw can be from preload and damage, damage, sealant and end sealing ring S14 end flange damage the investigation carried out.
In the future operation of the robot, operators should operate in accordance with the operating process of the robot to prevent such events from happening again.

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