Drawn arc welding gun

Abstract

The invention relates to an arc welding gun for sheet metal repair, which includes a shell, a live copper rod, a ground copper rod, a gasket holder, a switch, an inert gas pipe, a ground wire, a live wire, an aluminum plate, and an OT gasket. The invention is characterized in that a stopper and an equidistant stepper are provided, wherein the stopper is installed in the shell adjacent to the ground copper rod, and the adjustment of the stopper can limit or release the forward and backward sliding of the ground copper rod, and the equidistant stepper is installed in the middle of the shell, and the telescopic shaft of the equidistant stepper is connected to the rear end of the live copper rod. The cavity in the shell behind the equidistant stepper is a heat dissipation zone, and the control circuit board of the equidistant stepper is installed in the heat dissipation zone. The invention has the advantages of small product size, light weight, good heat dissipation, long-term continuous and stable operation, more stable welding performance, and more convenient operation.

Description

Technical Field

[0001] The invention relates to a drawn arc welding gun, in particular to a welding gun which is controlled by a servo motor to enable a live wire copper rod to be equidistantly telescopically welded. Background Art

[0002] In the process of automobile sheet metal repair, a drawn arc welding gun is used to weld a gasket on the concave sheet metal surface, and then the gasket is pulled by a tool to repair the concave sheet metal surface. However, the drawn arc welding guns on the market now all have a mechanical transmission welding structure, which makes the welding gun heavy and inconvenient to operate. In addition, during the welding process of the mechanical welding gun, the arc contact time and the pressure of the gasket on the sheet metal surface are controlled by the welding worker based on personal experience. Insufficient experience can easily cause problems such as cold welding, gasket tilting, and excessive arc starting time. Summary of the invention

[0003] The purpose of the present invention is to provide an arc welding gun, which is an electrically driven automatic welding equipment. The forward distance of the live wire copper rod can be accurately controlled by a servo motor, and the contact force between the gasket and the sheet metal can be controlled at the same time. It is not easy to cause problems such as cold welding and too long arc starting time.

[0004] The technical solution of the present invention is that the shell, the live copper rod, the ground copper rod, the gasket holder, the switch, the inert gas pipe, the ground wire, the live wire, the aluminum plate, and the OT gasket are provided, and the characteristics are that there are a stop device and an equidistant stepping device. The stop device is installed in the shell and is adjacent to the ground copper rod. The adjustment of the stop device can limit or loosen the forward and backward sliding of the ground copper rod. The equidistant stepping device is installed in the middle of the shell. The telescopic shaft of the equidistant stepping device is connected to the rear end of the live copper rod. The cavity behind the equidistant stepping device in the shell is a heat dissipation zone, and the control circuit board of the equidistant stepping device is installed in the heat dissipation zone.

[0005] The equidistant stepping device described in the present invention is composed of a servo motor and a control circuit board. The servo motor is fixed in the middle of an outer shell. The rotating shaft of the servo motor is connected to a live copper rod through a thread. The control circuit board is installed in the middle of a heat dissipation area of ​​the outer shell, and a drive signal output end is connected to a servo motor control end through a wire.

[0006] The stopping device described in the present invention is composed of a stopping plate, an adjusting knob, and a spring. The stopping device is located above the grounding copper rod in the shell. The two sides of the bottom end of the stopping plate are hinged to the shell. The bottom surface of the stopping plate is parallel to and tightly attached to the top surface of the grounding copper rod. The top of the stopping plate can swing forward and backward. The spring is installed in the middle of the upper front part of the stopping plate. The adjusting knob is arranged outside the rear end of the shell. A threaded rod is arranged at the front end of the adjusting knob. The front end of the threaded rod is inserted into the shell and extends to the middle of the upper back of the stopping plate.

[0007] The live copper rod of the present invention is installed in the middle of the front end of the shell, and there are two ground copper rods which are respectively installed on the shell at the left and right sides of the live copper rod. The rear end of the ground copper rod is inserted into the shell and is covered with a spring.

[0008] The shell of the present invention is provided with heat dissipation holes in arrays on both sides of the heat dissipation area.

[0009] The working principle of the present invention is to install a small servo motor in the welding gun to drive the live wire copper rod to accurately extend and retract the distance, thereby greatly reducing the overall size and weight of the welding gun, and at the same time completing high-quality welding. Since the stop plate and the adjusting knob form a simple stop mechanism, the stop plate is tilted or reset horizontally under the action of the spring when the adjusting knob is turned forward or reversed, thereby limiting or loosening the forward and backward sliding of the ground wire copper rod, so that the ground wire copper rod restriction operation effect is good and convenient, and does not occupy too much space in the inner cavity of the shell. A control circuit board is installed in a heat dissipation cavity reserved at the rear end of the shell, and the airflow generated by the servo motor when working drives the airflow in the inner cavity to dissipate the control circuit board and the servo motor. If necessary, a tail shaft with small fan blades can be added at the rear end of the servo motor to increase the airflow between the inner cavity and the outside world, ensuring sufficient heat dissipation for the electronic components to work stably for a long time.

[0010] The invention has the advantages of small product volume, light weight, good heat dissipation, long-term continuous and stable operation, more stable welding performance and more convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0012] Figure 2 It is a schematic diagram of the overall internal three-dimensional structure of the present invention;

[0013] Figure 3 It is a schematic diagram of the overall cross-sectional three-dimensional structure of the present invention. DETAILED DESCRIPTION

[0014] according to Figure 1 , Figure 2 , Figure 3As shown, the present invention is installed in sequence from front to back at the front end of the housing 1, the gasket holder 4 and the live copper rod 2, the switch 4 is installed on the handle of the housing and connected to the switch signal end of the control circuit board 17 through a wire, there are two ground copper rods 4, which are installed on the housing 1 and located on the left and right sides of the live copper rod 2, the rear end of the ground copper rod 4 is inserted into the housing 1, and is covered with a spring 18, the inert gas pipe, the ground wire, and the live wire are connected to the live copper rod 2 from the bottom end of the handle of the housing, when used, the OT gasket 10 is inserted into the gasket holder 4, the servo motor 16 is controlled by the switch 4 to drive the live copper rod 2 to move the gasket holder 4 forward, so that the front end of the OT gasket 10 starts arcing and is welded on the aluminum plate 9, and is characterized by having a stopper 11 and an equidistant stepping device 12, the stopper 11 is installed in the housing 1 and connected to the ground copper rod 3 Adjacent, the adjustment stop device 11 can limit or loosen the forward and backward sliding of the ground copper rod 3, the equidistant stepping device 12 is installed in the middle of the shell 1, the telescopic shaft of the equidistant stepping device 12 is connected to the rear end of the live copper rod 3, the cavity behind the equidistant stepping device in the shell 1 is the heat dissipation zone, and the two sides of the heat dissipation zone are arrayed with heat dissipation holes, and the control circuit board 17 of the equidistant stepping device 12 is installed in the heat dissipation zone. The equidistant stepping device 12 is composed of a servo motor 16 and a control circuit board 17. The servo motor 16 is fixed in the middle of the shell 1, the rotating shaft of the servo motor is connected to the live copper rod through a thread, and the control circuit board 17 is installed in the middle of the heat dissipation zone of the shell 1. There are air circulation gaps reserved in six directions. At the same time, the servo motor 16 can be with a tail shaft, and a small fan blade is installed on the tail shaft to enhance the air flow in the heat dissipation zone. The drive signal output end of the control circuit board 17 is connected to the control end of the servo motor 16 through a wire. The stop device 11 is composed of a stopper 15, an adjusting knob 13, and a spring 14, which is located above the ground copper rod 3 in the housing 1. The stopper is hinged to the support position in the housing 1 through the convex rods on both sides of its bottom end. The bottom surface of the stopper 15 is parallel and tightly attached to the top surface of the ground copper rod 3, and the top of the stopper 15 can swing forward and backward. The spring 14 is installed in the middle of the upper front part of the stopper 15 for horizontal reset. The adjusting knob 13 is arranged outside the rear end of the housing 1, and a threaded rod is raised in the middle of the front end of the adjusting knob. The front end of the threaded rod is inserted into the housing 1 and extends to the middle of the upper back of the stopper 15. When the adjusting knob rotates forward, the threaded rod moves forward to force the top of the stopper 15 to tilt forward, and the bottom of the stopper 15 tilts accordingly to generate sufficient friction on the ground copper rod 3 to limit its forward and backward sliding. When the adjustment knob is reversed, the threaded rod moves backward to create backward swinging space at the top of the stopper 15. Under the restoring force of the spring 14, the stopper 15 returns to a horizontal state, and its bottom is then parallel to the top surface of the ground copper rod 3, thereby relieving the friction force on the ground copper rod 3, so that the ground copper rod 3 can freely contract according to the external force at the front end or restore and extend according to the spring at its tail end.

Claims

1. A drawn arc welding gun, comprising a housing, a live copper rod, a ground copper rod, a gasket holder, a switch, an inert gas pipe, a ground wire, a live wire, and characterized by: The utility model discloses a stopper and an equidistant stepper. The stopper is installed in the shell and is adjacent to the ground copper rod. The adjustment stopper can limit or loosen the forward and backward sliding of the ground copper rod. The equidistant stepper is installed in the middle of the shell. The telescopic shaft of the equidistant stepper is connected with the rear end of the live copper rod. The cavity behind the equidistant stepper in the shell is a heat dissipation zone. The control circuit board of the equidistant stepper is installed in the heat dissipation zone. The stopper is composed of a stopper, an adjusting knob and a spring. The stopper is located above the ground copper rod in the shell. Both sides of the bottom end of the stopper are hinged with the shell. The bottom surface of the stopper is parallel to and tightly attached to the top surface of the ground copper rod. The top of the stopper can swing forward and backward. The spring is installed in the middle of the upper front part of the stopper. The adjusting knob is arranged outside the rear end of the shell. The front end of the adjusting knob is provided with a threaded rod. The front end of the threaded rod is inserted into the shell and extends to the middle of the upper back of the stopper.

2. The drawn arc welding gun according to claim 1, characterized in that The equidistant stepping device is composed of a servo motor and a control circuit board. The servo motor is fixed in the middle of the shell. The rotating shaft of the servo motor is connected to the live copper rod through a thread. The control circuit board is installed in the middle of the heat dissipation area of ​​the shell, and the drive signal output end is connected to the servo motor control end through a wire.

3. The drawn arc welding gun according to claim 1, characterized in that The live copper rod is installed in the middle of the front end of the shell. There are two ground copper rods, which are installed on the shell at the left and right sides of the live copper rod. The rear end of the ground copper rod is inserted into the shell and is covered with a spring.

4. The drawn arc welding gun according to claim 1, characterized in that Heat dissipation holes are arranged in arrays on both sides of the heat dissipation area of ​​the shell.

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