Compact stud welding gun

Abstract

The utility model relates to a compact stud welding gun which comprises a fixing frame, a gun body, a material ejection air cylinder, a compression spring and a welding nozzle, the gun body is fixedly arranged in the fixing frame, the material ejection air cylinder is arranged in the gun body in a sliding mode, the lower end of the material ejection air cylinder is fixedly connected with a fixing barrel, an ejection rod of the material ejection air cylinder extends into the fixing barrel, and the compression spring is arranged on the gun body. A feeding pipe communicated with the fixing barrel is connected to the side wall of the fixing barrel, the welding nozzle is fixedly connected to the lower end of the fixing barrel and communicated with the fixing barrel, a gland is fixedly connected to the upper end of the fixing frame, and the compression spring is arranged in the gland and tightly abuts against the upper end of the material ejecting air cylinder. The compact stud welding gun is compact in structure, the stability of a stud in the welding process is enhanced, and therefore the welding effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of welding equipment, in particular to a compact stud welding gun. Background Art

[0002] A stud welding gun is a device used for stud welding. Its working principle is to apply a certain pressure to the workpiece after the stud is pressed against it, and after power is turned on and an arc is struck, a weld pool is formed on the contact surface of the stud and the workpiece to achieve welding. For example, the Chinese utility model patent: A stud welding mechanism with firm welding (Announcement No.: CN212329971U) discloses a stud welding gun structure, which presses the stud against the workpiece in the following way: the ejection cylinder 3 moves downward, and pushes the welding nail (stud) to the elastic one-way chuck, the ejection cylinder 3 immediately moves upward, and the welding cylinder moves downward, driving the welding frame to move downward, and when the welding nail (stud) presses against the surface of the product, the movable discharge pipe compresses two pushing springs, and after the pushing springs are compressed to the target compression amount, the power is started, so that the welding nail (stud) is welded to the surface of the product. In the above structure and process, the welding nail (stud) is only tightened by the elastic one-way chuck when it presses against the surface of the workpiece, and the welding nail (stud) is easily deflected, resulting in a lack of welding firmness, and this stud welding gun structure is not suitable for welding operations of bare studs.

[0003] In view of the above problems, the present invention makes improvements. Utility Model Content

[0004] The utility model provides a compact stud welding gun, which solves the above-mentioned problems existing in the prior art during use.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] A compact stud welding gun comprises a fixing frame, a gun body, a pushing cylinder, a compression spring and a welding nozzle, wherein the gun body is fixedly arranged in the fixing frame, the pushing cylinder is slidably arranged in the gun body, the lower end of the pushing cylinder is fixedly connected to a fixing tube, the push rod of the pushing cylinder extends into the fixing tube, the side wall of the fixing tube is connected to a feeding pipe connected to the fixing tube, the welding nozzle is fixedly connected to the lower end of the fixing tube and is connected to the fixing tube, the upper end of the fixing frame is fixedly connected to a pressure cover, and the compression spring is arranged in the pressure cover and tightly abuts against the upper end of the pushing cylinder.

[0007] Preferably, a sliding bearing is provided in the gun body, the pushing cylinder is passed through the sliding bearing, the lower end of the pushing cylinder is formed with a first limiting ring portion located below the lower end surface of the sliding bearing, and the upper end is fixedly connected with a limiting plate located above the upper end surface of the sliding bearing.

[0008] Preferably, the limiting plate is connected to a positive terminal, the welding nozzle is provided with an insulating sleeve, a wiring cap is slidably provided on the insulating sleeve and surrounds the lower end of the welding nozzle, an air inlet is provided on the wiring cap and the negative terminal is connected to the wiring cap.

[0009] Preferably, the wiring cap is mounted on the insulating sleeve and a second limiting ring portion is formed on the inner wall of the wiring cap, and a third limiting ring portion located below the second limiting ring portion is formed on the outer wall of the insulating sleeve.

[0010] Preferably, the expansion sleeve on the insulating sleeve is provided with a guide cap surrounding the upper end of the wiring cap, and the inner wall of the guide cap is in contact with the outer wall of the wiring cap.

[0011] Preferably, an adjusting nut matching the inner diameter of the pressure cover is provided in the pressure cover, the upper end of the pressure cover is open and a vertical adjusting groove is provided on the side wall of the pressure cover, a limiting rod threaded on the adjusting nut is passed through the adjusting groove, an adjusting screw is threaded on the adjusting nut, the upper end of the adjusting screw passes through the opening at the upper end of the pressure cover and a fourth limiting ring portion is formed on the adjusting screw, a fifth limiting ring portion located above the fourth limiting ring portion is formed in the opening at the upper end of the pressure cover, and the compression spring is located between the adjusting nut and the top-feeding cylinder.

[0012] Preferably, the end of the adjusting screw passing through the opening at the upper end of the pressure cover is fixedly connected with a knob.

[0013] To sum up, the beneficial effect of the present invention is that: during the stud welding process, when the stud is tightly against the surface of the workpiece, the push rod of the push cylinder always rests on the end face of the stud, thereby enhancing the stability of the stud when it rests against the surface of the workpiece, thereby ensuring the welding effect, and the push cylinder is arranged inside the gun body, making the overall structure of the stud welding gun more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0017] Figure 3 for Figure 2 A magnified schematic diagram of point A in the middle;

[0018] Figure 4 for Figure 2 A magnified schematic diagram of point B in the middle;

[0019] Figure 5 It is an exploded schematic diagram of the present utility model.

[0020] In the figure: 1. fixing frame; 2. gun body; 3. ejecting cylinder; 31. first limiting ring; 4. compression spring; 5. welding nozzle; 6. fixing cylinder; 7. feeding pipe; 8. pressure cover; 81. adjusting groove; 82. fifth limiting ring; 9. sliding bearing; 10. limiting plate; 11. positive terminal; 12. insulating sleeve; 121. third limiting ring; 13. terminal cap; 131. second limiting ring; 132. air inlet; 14. negative terminal; 15. guide cap; 16. adjusting nut; 17. limiting rod; 18. adjusting screw; 181. fourth limiting ring; 19. knob. DETAILED DESCRIPTION

[0021] The following is a combination of the appended examples of the present invention Figure 1-5 , clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] As shown in the figure, a compact stud welding gun includes a fixed frame 1, a gun body 2, a pushing cylinder 3, a compression spring 4 and a welding nozzle 5. The gun body 2 is fixedly arranged in the fixed frame 1, and the pushing cylinder 3 is slidably arranged in the gun body 2. The lower end of the pushing cylinder 3 is fixedly connected to a fixed tube 6, and the push rod of the pushing cylinder 3 extends into the fixed tube 6. The side wall of the fixed tube 6 is connected to a feeding pipe 7 connected to the fixed tube 6. The welding nozzle 5 is fixedly connected to the lower end of the fixed tube 6 and is connected to the fixed tube 6. The upper end of the fixed frame 1 is fixedly connected to a pressure cover 8, and the compression spring 4 is arranged in the pressure cover 8 and tightly against the upper end of the pushing cylinder 3.

[0023] Specifically, the structure of the pushing cylinder 3 is slidably arranged in the gun body 2: a sliding bearing 9 is provided in the gun body 2, and the pushing cylinder 3 is inserted into the sliding bearing 9. The lower end of the pushing cylinder 3 is formed with a first limiting ring portion 31 located below the lower end surface of the sliding bearing 9, and the upper end is fixedly connected with a limiting plate 10 located above the upper end surface of the sliding bearing 9. The sliding bearing 9 ensures the stability and smoothness of the pushing cylinder 3 when sliding in the gun body 2, and the limiting plate 10 and the first limiting ring portion 31 limit the axial sliding of the pushing cylinder 3 in the gun body 2 by cooperating with the upper and lower end surfaces of the bearing.

[0024] Specifically, the welding power connection structure: the positive terminal 11 is connected to the limiting plate 10, the welding nozzle 5 is provided with an insulating sleeve 12, and a wiring cap 13 is slidably provided on the insulating sleeve 12 and surrounds the lower end of the welding nozzle 5. The wiring cap 13 is provided with an air inlet hole 132 and the wiring cap 13 is connected to the negative terminal 14.

[0025] Specifically, the structure of the wiring cap 13 being slidably arranged on the insulating sleeve 12: the wiring cap 13 is sleeved on the insulating sleeve 12 and a second limiting ring portion 131 is formed on the inner wall of the wiring cap 13, and a third limiting ring portion 121 is formed on the outer wall of the insulating sleeve 12 and is located below the second limiting ring portion 131. The second limiting portion and the third limiting portion cooperate to limit the downward sliding of the wiring cap 13 on the insulating sleeve 12, preventing the wiring cap 13 from falling off the insulating sleeve 12, thereby ensuring the stability of the wiring cap 13 during operation.

[0026] In the above embodiment, the welding gun is fixedly mounted on the Z-axis drive structure of the stud welding machine through the fixing frame 1, the feed pipe is connected to the stud feeding device, the positive terminal 11 and the negative terminal 14 are connected to the power supply so that the welding nozzle 5 and the terminal cap 13 are respectively connected to the positive and negative poles of the power supply to perform the stud welding operation. When the welding operation is performed, the stud is transported into the fixed tube through the feed pipe and falls into the welding nozzle 5. The push rod of the ejection cylinder 3 pushes the stud downward so that it moves downward, passes through the welding nozzle 5 and is stuck on the lower end of the welding nozzle 5. Then the Z-axis drive mechanism drives the welding gun downward toward the workpiece, so that the terminal cap 13 and the stud are tightly against the surface of the workpiece and compress the compression spring 4. After power is turned on, the welding of the stud and the workpiece is completed. After the welding is completed, the ejection cylinder 3 is reset, and then the Z-axis drive mechanism Drive the welding gun to reset. During the above-mentioned stud welding process, when the stud is tightly against the surface of the workpiece, the push rod of the pushing cylinder 3 always rests on the end face of the stud, which enhances the stability of the stud when it rests against the surface of the workpiece, thereby ensuring the welding effect. The pushing cylinder 3 is arranged inside the gun body 2, so that the overall structure of the stud welding gun is more compact. The compression of the compression spring 4 during welding is achieved by the pushing cylinder 3 driving the fixed tube and the welding nozzle 5 to slide axially. During welding, the wiring cap 13 surrounds the side of the welding nozzle 5, which can reduce sparks during welding. The air inlet 132 on the wiring cap 13 is used to realize welding due to the entry of outside air between the wire clamping cap and the welding nozzle 5, and the sliding of the wiring cap 13 can meet the requirements of different welding heights of the stud and the workpiece.

[0027] Preferably, the expansion sleeve on the insulating sleeve 12 is provided with a guide cap 15 surrounding the upper end of the wiring cap 13, and the inner wall of the guide cap 15 is in contact with the outer wall of the wiring cap 13. The guide cap 15 guides the sliding of the wiring cap 13, ensuring the stability of the wiring cap 13 when sliding, thereby ensuring that the wiring cap 13 can accurately contact the workpiece for welding operations.

[0028] Furthermore, an adjusting nut 16 matching the inner diameter of the pressure cover 8 is provided in the pressure cover 8, the upper end of the pressure cover 8 is open and a vertical adjusting groove 81 is provided on the side wall of the pressure cover 8, a limiting rod 17 threaded on the adjusting nut 16 is passed through the adjusting groove 81, an adjusting screw 18 is threaded on the adjusting nut 16, the upper end of the adjusting screw 18 passes through the opening at the upper end of the pressure cover 8 and a fourth limiting ring portion 181 is formed on the adjusting screw 18, a fifth limiting ring portion 82 located above the fourth limiting ring portion 181 is formed in the opening at the upper end of the pressure cover 8, and the compression spring 4 is located between the adjusting nut 16 and the top-feeding cylinder 3.

[0029] In the above preferred embodiment, the fourth limiting ring portion 181 and the fifth limiting ring portion 82 cooperate to limit the axial movement of the adjusting screw 18, and the adjusting screw 18 maintains the fourth limiting ring portion 181 and the fifth limiting ring portion 82 under the action of the restoring force of the compression spring 4, and the limiting rod 17 cooperates with the adjusting groove 81 to limit the axial rotation of the adjusting nut 16. By rotating the adjusting screw 18 and cooperating with the threaded connection between the adjusting screw 18 and the adjusting nut 16, the adjusting nut 16 can be driven to move axially on the adjusting screw 18, and the distance between the adjusting nut 16 and the top cylinder 3 is adjusted, and then the preload of the compression spring 4 is adjusted, so that the pressure of the compression spring 4 on the stud meets different welding requirements, thereby making this stud welding gun have better applicability and the adjustment of the pressure ring preload is very convenient.

[0030] Preferably, the end of the adjusting screw 18 passing through the opening of the upper end of the pressure cover 8 is fixedly connected with a knob 19, and the adjusting screw 18 can be rotated more conveniently by the knob 19 to adjust the preload of the compression spring 4.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A compact stud welding gun, comprising a fixing frame (1), a gun body (2), a material ejecting cylinder (3), a compression spring (4) and a welding nozzle (5), characterized in that: The gun body (2) is fixedly arranged in the fixed frame (1), the ejecting cylinder (3) is slidably arranged in the gun body (2), the lower end of the ejecting cylinder (3) is fixedly connected to the fixed cylinder (6), the ejector rod of the ejecting cylinder (3) extends into the fixed cylinder (6), the side wall of the fixed cylinder (6) is connected to a feed pipe (7) connected to the fixed cylinder (6), the welding nozzle (5) is fixedly connected to the lower end of the fixed cylinder (6) and is connected to the fixed cylinder (6), the upper end of the fixed frame (1) is fixedly connected to a pressure cover (8), and the compression spring (4) is arranged in the pressure cover (8) and is tightly pressed against the upper end of the ejecting cylinder (3).

2. The compact stud welding gun according to claim 1, characterized in that: A sliding bearing (9) is provided in the gun body (2), and the ejection cylinder (3) is inserted into the sliding bearing (9). A first limiting ring portion (31) located below the lower end surface of the sliding bearing (9) is formed at the lower end of the ejection cylinder (3), and a limiting plate (10) located above the upper end surface of the sliding bearing (9) is fixedly connected to the upper end of the ejection cylinder (3).

3. The compact stud welding gun according to claim 2, characterized in that: The limiting plate (10) is connected to a positive terminal (11), the welding nozzle (5) is sleeved with an insulating sleeve (12), a wiring cap (13) is slidably provided on the insulating sleeve (12) and surrounds the lower end of the welding nozzle (5), an air inlet hole (132) is provided on the wiring cap (13), and a negative terminal (14) is connected to the wiring cap (13).

4. The compact stud welding gun according to claim 3, characterized in that: The wiring cap (13) is sleeved on the insulating sleeve (12), and a second limiting ring portion (131) is formed on the inner wall of the wiring cap (13), and a third limiting ring portion (121) located below the second limiting ring portion (131) is formed on the outer wall of the insulating sleeve (12).

5. The compact stud welding gun according to claim 4, characterized in that: The upper expansion sleeve of the insulating sleeve (12) is provided with a guide cap (15) surrounding the upper end of the wiring cap (13), and the inner wall of the guide cap (15) is in contact with the outer wall of the wiring cap (13).

6. The compact stud welding gun according to claim 1, characterized in that: An adjusting nut (16) matching the inner diameter of the pressure cover (8) is provided in the pressure cover (8), the upper end of the pressure cover (8) is open and a vertical adjusting groove (81) is provided on the side wall of the pressure cover (8), a limiting rod (17) threaded on the adjusting nut (16) is passed through the adjusting groove (81), an adjusting screw (18) is threaded on the adjusting nut (16), the upper end of the adjusting screw (18) passes through the opening at the upper end of the pressure cover (8) and a fourth limiting ring portion (181) is formed on the adjusting screw (18), a fifth limiting ring portion (82) located above the fourth limiting ring portion (181) is formed in the opening at the upper end of the pressure cover (8), and the compression spring (4) is located between the adjusting nut (16) and the ejection cylinder (3).

7. The compact stud welding gun according to claim 6, characterized in that: The end of the adjusting screw (18) passing through the opening at the upper end of the pressure cover (8) is fixedly connected to a knob (19).

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