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为进行K-701拖拉机驾驶室后壁的点焊,采用了专用的焊机。该焊机中焊钳的移动是按给定的程序进行的。然而,在焊接此种结构时,须将夹具绕O点转动。在程序失调(若夹具还未转动)或在焊钳的行程中有异物存在时,则可能损坏其电极夹座或臂杆。为此研制了装在焊钳臂杆上的保险机构。保险机构的装置示于图2。焊钳的驱动液压缸13装在臂杆1与12的上部,以轴销11彼此相联,并与溜板相联。在此两臂杆的下部装有极夹座9与10。在臂杆1上装有保险机构,销电它由柱2与带导向件4的电极夹座9组成,3把它们联在一起。滑块6的承压表面(H)受弹簧5的平端头顶压。滑块的另一端装有限
For the spot welding of the rear wall of the K-701 tractor cab, a special welder was used. The movement of the welding tongs in the welder is carried out according to a given procedure. However, when welding such a structure, it is necessary to rotate the jig around point O. If the program is out of alignment (if the jig has not yet been turned) or if foreign objects are present during the journey of the jig, the electrode holder or arm may be damaged. For this reason, the insurance mechanism installed on the arm of welding gun has been developed. The insurance agency’s installation is shown in Figure 2. The driving cylinder 13 of the welding torch is mounted on the upper part of the arms 1 and 12, and is connected to each other with a shaft pin 11 and is connected to the slide plate. In the lower part of the two arms are equipped with pole clamps 9 and 10. The arm 1 is provided with an insurance mechanism. The pin is made up of a post 2 and an electrode holder 9 with a guide 4, and the three are connected together. The pressure surface (H) of the slider 6 is pressed by the flat end of the spring 5. The other end of the slider is limited