AC variable frequency speed control technology implements the change of the slewing mechanism

The elliptical housing of the master tracking mechanism changes continuously as the phase of the housing changes during the rotation process. To achieve automatic welding, the distance between the welding gun and the center of rotation of the housing must be changed according to the change of its radius of gyration, so that the relative distance between the welding gun and the housing does not change, that is, the automatic tracking of the weld is realized. The automatic welding machine adopts a follower type master tracking mechanism. In the structural design, the tracking and the contact point of the master and the welding point are separated, and the tracking blind zone problem generally existing in the general contact tracking is solved. Considering the wear of the contactor for a long time, the tracking mechanism must be the blade of the dog, and the design of the electronic control system of the electronic control system is adopted as the main control machine, including the timing control. Variable speed control position control safety detection control and other control units.

The rotation speed of the housing is controlled by AC variable frequency speed control technology, and the position information of the housing is accurately recorded and fed back by the photoelectric encoder. The relevant technical parameters such as the weld length and the welding speed can be preset by the length of the weld, and the automatic welding can be realized in the true sense. Speed ​​control For the welding of the elliptical compressor housing, if the rotation speed of the slewing mechanism does not change, the welding speed (housing line speed) will change due to the change of the position of the long and short shafts of the housing (about the result one) It is caused by the inconsistency of the width of the weld, affecting the quality of the compressor, and is limited by the welding speed at the long axis, which limits the improvement of production efficiency.

In order to solve the above problems, the automatic welding machine adopts AC frequency conversion speed control technology, and implements variable speed control on the slewing mechanism, so that the line speed of the casing is basically kept consistent, thereby ensuring uniform uniformity of the weld. Controlling the automation of the entire process of welding to obtain high quality welds requires a number of technical measures to be taken during the welding of the entire weld. The prerequisite for implementing these technical measures is the accurate identification and feedback of the position information of the housing.