The driving structure of the main shaft in the stud welding torch

Abstract

The invention discloses a driving structure of a main shaft body in a stud welding gun. The interior of a cavity of a welding gun casing is sequentially provided with the main shaft body, a movable iron core and a fixing sleeve from front to back, the fixing sleeve is internally provided with a coil, the tail end of the movable iron core is inserted into the front end of the fixing sleeve, a first reset spring is arranged in the welding gun casing and is used for the main shaft body to reset after arc striking, a shaft sleeve is fixedly arranged in the cavity of the welding gun casing, the main shaft body is movably arranged in the shaft sleeve in a penetrating way, the tail end of the main shaft body is provided with a driving shaft, the driving shaft is electrically insulated from the main shaft body, a self-adaptive structure is arranged between the main shaft body and the driving shaft, the front end of the movable iron core is provided with a connecting hole which is matched with the driving shaft, the driving shaft is inserted into the connecting hole, and can axially slide in the connecting hole, an adjusting gap is formed between the main shaft body and the movable iron core, and a locking structure is arranged between the driving shaft and the movable iron core. The driving structure has the advantages that the structure is simple, the axial movement of the main shaft body is flexible and reliable, and a lifting clearance is not changed.

Description

technical field [0001] The invention relates to a stud welding torch, in particular to a driving structure of a main shaft in the stud welding torch. Background technique [0002] Common stud welding torches at present include: an injection-molded welding torch housing, in which a driving structure for driving the movement of the main shaft body is arranged. The driving structure of the main shaft body is: from front to rear in the cavity of the welding torch housing The main shaft body, the moving iron core and the fixed sleeve provided with the coil are arranged in sequence, the main shaft body and the moving iron core are fixedly connected head to tail as a whole, and the front end of the main shaft body is connected with the integrated chuck seat for installing the stud. A shaft sleeve is fixedly arranged in the cavity of the welding torch housing, and the main shaft body is passed through the shaft sleeve and can slide axially in the shaft sleeve. A spring capable of r...

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Problems solved by technology

[0003] The main disadvantages of the driving structure of the main shaft in the stud welding torch with the above structure are: (1) During the actual use of the stud welding torch, due to the existence of factors such as machining errors, installation errors, and thermal deformation of the torch shell, it will cause The concentricity of the shaft sleeve and the fixed sleeve is not high, which will increase the resistance when the main shaft body and the moving iron core, which are fixedly connected from the end to the end, move axially, and greatly increase the distance between the main shaft body and the shaft sleeve, as well as the moving iron core and the fixed sleeve. If it is serious, it will cause the moving iron core to be stuck in the fixed sleeve or the moving iron core cannot be inserted into the fixed sleeve, so that the axial movement of the main shaft body cannot be realized, and the welding work cannot be carried out normally; (2) Before starting the welding work, put the stud into the integrated chuck seat after setting the aluminum sleeve on the head of the welding torch, and then put the torch head down so that the front end of the aluminum sleeve is pressed against the plate. At this time, the front end of the stud is also Pressing against the plate, since the main shaft body and the moving iron core are fixedly connected, there will inevitably be machining errors in the stud during the machining process. When the actual length of the stud is slightly longer, the stud compresses the spring through the main shaft body And slide to the tail end, so that the lifting gap between the moving iron core and the static iron core becomes smaller, thereby shortening the arc striking distance during welding arc striking, which is prone to the phenomenon that the arc cannot be struck, which greatly reduces the qualified rate of welding. relatively low efficiency

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