Industrial welding robots are industrial robots engaged in welding (including cutting and spraying). They are used in the field of industrial automation. In order to adapt to different uses, the mechanical interface of the last axis of industrial welding robots is usually a connecting flange, which can be connected to different tools. Or called the end effector, the industrial welding robot is to attach welding tongs or welding (cutting) guns to the final shaft flange of the industrial robot to enable welding, cutting or thermal spraying.
Spot welding does not require very high welding robots. Because spot welding only needs point control, there is no strict requirement for the trajectory of the welding gun between points, which is why the robot can only be used for spot welding at the earliest. The robot for spot welding must not only have enough load capacity, but also must be fast when shifting from point to point, the action must be stable, and the positioning must be accurate to reduce the shifting time and improve
High work efficiency. The load capacity of the spot welding robot depends on the type of welding gun used. For welding guns separated from the transformer, a robot with a load of 30 to 45 kg is sufficient. However, on the one hand, this kind of welding tongs due to the long secondary cable and high power loss, it is also not conducive to the robot to extend the welding tongs into the workpiece for welding; on the other hand, the cable keeps swinging with the movement of the robot, and the cable is damaged quickly . Therefore, the use of integrated welding guns is gradually increasing. The weight of this welding tongs together with the transformer is about 70kg.
Considering that the robot must have sufficient load capacity and be able to send the welding tongs to the space position for welding at a larger acceleration, a heavy-duty robot with a load of 100 to 150 kg is generally used. In order to meet the requirement of short distance and rapid displacement of the welding gun during continuous spot welding. The new heavy-duty robot has the function of completing a 50mm displacement in 0.3s. This puts forward higher requirements on the performance of the motor, the calculation speed of the microcomputer and the algorithm.
