Pressure spring type welding pin pressure adjusting device of resistance welding machine

Abstract

The utility model discloses a pressure spring type welding needle pressure adjusting device of a resistance welding machine, which belongs to the technical field of resistance welding and comprises a welding pen main rod, a welding pen fixing tube and a pressure adjusting tube, the welding pen fixing tube and the pressure adjusting tube are both sleeved on the outer surface of the welding pen main rod, and a pressure spring sleeved on the outer surface of the welding pen main rod is arranged in the pressure adjusting tube. A limiting protruding block abutting against the rear end of the pressure spring is arranged on the inner wall of the welding pen fixing pipe, the rear end of the pressure adjusting pipe abuts against the front end of the pressure spring, and threads matched with each other are arranged on the inner wall of the pressure adjusting pipe and the outer surface of the welding pen main rod. The inner wall of the welding pen fixing tube is provided with a trigger ring which is closed and surrounds a circle, and the outer surface of the welding pen main rod is provided with a welding current switch matched with the trigger ring; welding pressure can be adjusted through the pressure adjusting pipe, so that the welding pressure is matched with the material or thickness of a welder and a workpiece to be welded, and the welding effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance welding, in particular to a compression spring type welding needle pressure regulating device for a resistance welding machine. Background Art

[0002] Resistance welding refers to a method of using the resistance heat generated by the current passing through the weldment and the contact point as a heat source to locally heat the weldment to a molten or plastic state, and at the same time pressurize it for welding. The principle is: when the current passes through the welding needle (the electrode at the end of the welding pen) and the contact surface and adjacent area of ​​the workpiece, due to the large resistance at the contact point, a large amount of heat will be generated, causing the metal to reach a molten or plastic state, and then the two metal workpieces will be combined under pressure; during the resistance welding process, it is necessary to apply appropriate welding pressure to the workpiece to be welded. The welding pressure sometimes needs to be adjusted according to factors such as the thickness of the workpiece. At the same time, the size of the welding pressure will affect the quality and effect of the welding position of the workpiece. At present, the welding of some special workpieces or small batches of workpieces will be carried out by manually holding a welding gun or welding pen, and it is difficult for welders to ensure that the pressure applied is the same each time welding or the welding pressure does not meet the standard, which leads to uneven quality of the welding position on the surface of the workpiece after welding or unqualified welding quality, affecting the appearance and quality of the welded workpiece.

[0003] A Chinese patent with publication number CN210817924U discloses a double-group welding needle mobile welding pen for a resistance welding machine, comprising a handle shell, a double-group welding needle structure passing through both ends of the handle shell, the double-group welding needle structure comprising two groups of welding needle structures arranged in a mirror image and two groups of elastic limiting mechanisms, the side of the welding needle structure is connected to the inner wall of the handle shell through the elastic limiting mechanism, the welding needle structure comprises welding arms arranged side by side, welding needles are arranged on the top of the welding arms, the welding arms in the same welding needle structure are separated by an insulating sheet, and no two welding arms are fitted together; the welding pen achieves balanced pressure distribution at four welding points through internal pressure springs and other structures, but it is difficult to ensure that the welding pressure applied during each welding is the same, and it is also impossible to adjust the pressure of the welding head on the workpiece, which easily leads to uneven welding quality at the welding point of the workpiece after welding or unqualified welding quality, so there is still room for improvement. Utility Model Content

[0004] In view of the technical defects existing in the background technology, the utility model proposes a resistance welding machine compression spring type welding needle pressure adjustment device, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows:

[0005] A resistance welding machine compression spring type welding needle pressure adjustment device comprises a welding pen main rod, a welding pen fixing tube, and a pressure adjustment tube, wherein the welding pen fixing tube and the pressure adjustment tube are both sleeved on the outer surface of the welding pen main rod, a pressure spring sleeved on the outer surface of the welding pen main rod is arranged in the pressure adjustment tube, a limiting convex block is arranged on the inner wall of the welding pen fixing tube, a rear end of the pressure spring abuts against the limiting convex block, the pressure adjustment tube is located in front of the welding pen fixing tube, a rear end of the pressure adjustment tube extends into the welding pen fixing tube and abuts against the front end of the pressure spring, and a mutually matching thread is arranged on the inner wall of the pressure adjustment tube and the outer surface of the welding pen main rod;

[0006] The inner wall of the welding pen fixing tube is provided with a trigger ring which is closed around a circle, and the outer surface of the welding pen main rod is provided with a welding current switch which matches the trigger ring.

[0007] As a further technical solution of the utility model, the outer surface of the pressure adjustment tube is provided with pressure adjustment scales, and the pressure adjustment scales are evenly distributed along the extension direction of the pressure adjustment tube.

[0008] As a further technical solution of the utility model, a plurality of hand-tightened anti-slip grooves are provided at the front end of the outer surface of the pressure adjustment tube, and the plurality of hand-tightened anti-slip grooves surround a circle along the outer surface of the pressure adjustment tube.

[0009] As a further technical solution of the utility model, the shape of the trigger ring is a groove sunken into the inner wall of the welding pen fixing tube, and the surface of the welding current switch is provided with a trigger button matching the trigger ring. The top of the trigger button inside the welding current switch is elastically abutted against the inner wall of the welding pen fixing tube or the inner wall of the trigger ring.

[0010] As a further technical solution of the utility model, the front end of the welding pen main rod passes through the front end of the pressure adjustment tube and extends forward, and the front end of the welding pen main rod is provided with a welding needle fixing hole.

[0011] As a further technical solution of the utility model, the rear end of the welding pen main rod passes through the rear end of the welding pen fixing tube and extends backward, the rear end of the welding pen main rod is provided with an electrical interface, and the outer surface of the welding pen main rod is provided with a circuit groove extending from the electrical interface to the welding current switch.

[0012] As a further technical solution of the utility model, a fixing ring is provided at the front end of the outer surface of the welding pen fixing tube, the welding pen fixing tube sleeve is provided with a welding pen shell whose front end abuts against the fixing ring, and the inner wall of the welding pen shell and the outer surface of the welding pen fixing tube are provided with mutually matching threads.

[0013] As a further technical solution of the utility model, a mounting mechanism is sleeved on the outer surface of the soldering pen fixing tube, and the inner wall of the mounting mechanism and the outer surface of the soldering pen fixing tube are provided with mutually matching threads.

[0014] The beneficial effects of the utility model are:

[0015] The pressure adjusting tube of the utility model can be rotated to move toward or away from the pressure spring through the thread matching with the main rod of the welding pen, so as to adjust the compression amount of the pressure spring by the pressure adjusting tube. When the pressure spring is at different compression amounts, the pressure required to compress it by the same distance will be different. The welding pressure during welding requires that the pressure spring compressed by the welding pen fixing tube moves until the trigger ring is disengaged from the welding current switch before the current can be turned on. Therefore, the welding pressure can be adjusted by the pressure adjusting tube to match the welding pressure with the material or thickness of the welder and the workpiece to be welded, thereby improving the welding effect. When the welding pressure is applied or removed, the welding pen fixing tube will move and trigger the welding current switch to turn on or off the current, thereby realizing the control of the welding action and improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a cross-sectional view of a spring-loaded welding needle pressure adjustment device for a resistance welding machine.

[0017] Figure 2 The present invention is a cross-sectional view of a welding pen fixing tube of a compression spring type welding needle pressure adjustment device of a resistance welding machine.

[0018] Figure 3 yes Figure 1 Partial schematic diagram at point A in the middle.

[0019] Figure 4 The present invention is a schematic diagram of a resistance welding machine compression spring type welding needle pressure adjustment device triggering a welding current switch.

[0020] Figure 5 yes Figure 4 Partial schematic diagram of point B in the middle.

[0021] Figure 6 The present invention is a schematic diagram of adjusting welding pressure by a compression spring type welding needle pressure adjustment device of a resistance welding machine.

[0022] Figure 7 The present invention is a structural schematic diagram of a pressure regulating tube of a compression spring type welding needle pressure regulating device of a resistance welding machine.

[0023] Figure 8 The present invention is a cross-sectional view of a second embodiment of a compression spring type welding needle pressure adjustment device for a resistance welding machine.

[0024] Fig. 9 The present invention is a cross-sectional view of a third embodiment of a compression spring type welding needle pressure adjustment device for a resistance welding machine.

[0025] Fig.10 The present invention is a schematic diagram of a resistance welding machine compression spring type welding needle pressure adjustment device installed in a welding device.

[0026] Among them: welding pen main rod 1, welding current switch 11, trigger button 111, welding needle fixing hole 12, electrical interface 13, line groove 14, welding pen fixing tube 2, limiting protrusion 21, trigger ring 22, fixing ring 23, pressure adjustment tube 3, pressure adjustment scale 31, hand-tightening anti-slip pattern 32, pressure spring 4, welding pen housing 5, installation mechanism 6, welding equipment 7. DETAILED DESCRIPTION

[0027] The implementation methods of the present invention are described below in conjunction with the accompanying drawings and relevant embodiments. The implementation methods of the present invention are not limited to the following embodiments, and the present invention involves relevant necessary components in this technical field, which should be regarded as common knowledge in this technical field and can be known and mastered by technical personnel in this technical field.

[0028] like Figure 1-6 As shown, a resistance welding machine compression spring type welding needle pressure adjustment device comprises a welding pen main rod 1, a welding pen fixing tube 2, and a pressure adjustment tube 3. The welding pen fixing tube 2 and the pressure adjustment tube 3 are both sleeved on the outer surface of the welding pen main rod 1. A pressure spring 4 sleeved on the outer surface of the welding pen main rod 1 is arranged in the pressure adjustment tube 3. A limiting protrusion 21 is arranged on the inner wall of the welding pen fixing tube 2. The rear end of the pressure spring 4 abuts against the limiting protrusion 21. The pressure adjustment tube 3 is located in front of the welding pen fixing tube 2. The rear end of the pressure adjustment tube 3 extends into the welding pen fixing tube 2 and abuts against the front end of the pressure spring 4. The inner wall of the pressure adjustment tube 3 and the outer surface of the welding pen main rod 1 are provided with mutually matching threads; the front end of the welding pen main rod 1 passes through the front end of the pressure adjustment tube 3 and extends forward, and a welding needle fixing hole 12 is arranged at the front end of the welding pen main rod 1; the inner wall of the welding pen fixing tube 2 is provided with a closed trigger ring 22, and the outer surface of the welding pen main rod 1 is provided with a welding current switch 11 matching the trigger ring 22.

[0029] The utility model discloses an internal structure of a welding gun, a welding pen and other equipment based on resistance welding. A welding pin fixing hole 12 at the front end of a welding pen main rod 1 is used to fix the welding pin that contacts a workpiece to be welded during welding. The welding pen main rod 1 and the welding pin are electrically connected by interference fit to achieve a large current passing capacity. An insulating welding pen shell 5 is fixed to the outer surface of a welding pen fixing tube 2, or the device is fixed to a resistance welding machine through the welding pen fixing tube 2. When welding the workpiece to be welded, the end of the welding pin abuts against the surface of the workpiece to be welded, and the welding pressure acts vertically downward on the welding pen fixing tube 2 to make the welding pen fixing tube 2 move downward. Since the rear end of a pressure spring 4 abuts against a limiting protrusion 21 and the front end abuts against a pressure adjusting tube 3, and the pressure adjusting tube 3 is fixed to the welding pen main rod 1 through a thread, the pressure spring 4 is compressed during the downward movement of the welding pen fixing tube 2, and the welding pressure After being transmitted to the guide rod and the welding needle through the pressure spring 4, it is applied to the surface of the workpiece to be welded. The welding pressure will cause the welding pen fixing tube 2 to move downward and compress the pressure spring 4. When the welding pen fixing tube 2 moves downward to the point where the trigger ring 22 is disengaged from the welding current switch 11, the welding pen fixing tube 2 stops moving downward. The welding current switch 11 will connect the current to allow the current to flow through the position where the welding needle contacts the workpiece to be welded. The current causes a large amount of heat to be generated at the position where the workpieces to be welded contact each other and melt. Under the action of the welding pressure, the workpieces to be welded are fused to each other. Then the welding pressure is withdrawn and the elastic force generated by the reset of the pressure spring 4 causes the welding pen fixing tube 2 to move upward for reset. During this process, the trigger ring 22 will re-match the welding current switch 11 and disconnect the current. After the pressure spring 4 and the welding pen fixing tube 2 are reset, the workpiece is welded once.

[0030] After adopting the above structure, it should be noted that the pressure spring 4 is preferably a progressive pressure spring, and the pressure adjusting tube 3 can move toward the pressure spring 4 or away from the pressure spring 4 by rotating through a thread that matches the welding pen main rod 1. When the pressure adjusting tube 3 moves toward the pressure spring 4, the pressure spring 4 will be compressed. As the pressure spring 4 is compressed, the pressure required to continue to compress the pressure spring 4 will increase. When the resistance welding machine is welding, the welding pressure needs to make the welding pen fixing tube 2 compress the pressure spring 4 and move it until the trigger ring 22 is disengaged from the welding current switch 11 before the current can be turned on. The compression of the front end of the pressure spring 4 by the pressure adjusting tube 3 increases the compression amount of the pressure spring 4 during welding, thereby increasing the welding pressure, and vice versa, reducing the welding pressure, thereby playing a role in regulating the welding pressure. It can be compared Figure 1 and Figure 6After adjusting the welding pressure, the pressure spring 4 is in a state of different compression amounts; when the workpiece is manually welded, since the strength of each welding operator is different, the operator can adjust the welding pressure by rotating the welding pen fixing tube 2 to keep the welding pressure constant and best match his own operating habits, thereby improving the welding efficiency. At the same time, some workpieces to be welded with different thicknesses need to be welded with different welding pressures. Adjusting the welding pressure to the optimal value of the workpiece to be welded can improve the welding quality.

[0031] The pressure adjusting tube 3 of the utility model can be rotated toward or away from the pressure spring 4 through the thread matching with the welding pen main rod 1, so as to adjust the compression amount of the pressure adjusting tube 3 on the pressure spring 4. When the pressure spring 4 is at different compression amounts, the pressure required to compress it by the same distance will be different. The welding pressure during welding requires that the welding pen fixing tube 2 compresses the pressure spring 4 and moves it until the trigger ring 22 is disengaged from the welding current switch 11 before the current can be turned on. Therefore, the welding pressure can be adjusted by the pressure adjusting tube 3 to match the welding pressure with the material or thickness of the welder and the workpiece to be welded, thereby improving the welding quality. When the welding pressure is applied or removed, the welding pen fixing tube 2 will move and trigger the welding current switch 11 to turn on or off the current, thereby realizing the control of the welding action and improving the welding efficiency.

[0032] like Figure 7 As shown, as one of the preferred embodiments of the utility model, the outer surface of the pressure regulating tube 3 is provided with a pressure regulating scale 31 , and the pressure regulating scale 31 is evenly distributed along the extending direction of the pressure regulating tube 3 .

[0033] When the rotating pressure adjustment tube 3 of the utility model adjusts the welding pressure, it will move relative to the welding pen fixing tube 2. The greater the compression amount of the pressure adjustment tube 3 on the pressure spring 4, the longer the length of the pressure adjustment tube 3 inside the welding pen fixing tube 2, and the greater the welding pressure. The welding pressure reference values ​​can be marked on the pressure adjustment scale 31 in sequence, and the greater the distance from the front end of the welding pen fixing tube 2, the greater the welding pressure reference value marked on the pressure adjustment scale 31. The current welding pressure reference value can be known by observing the pressure adjustment scale 31 relative to the front end of the welding pen fixing tube 2. The welder can rotate the pressure adjustment tube 3 to quickly adjust the welding pressure each time using the resistance welding machine, thereby improving the efficiency of adjusting the welding pressure.

[0034] like Figure 7 As shown, as one of the preferred embodiments of the utility model, a plurality of hand-tightening anti-slip grooves 32 are provided at the front end of the outer surface of the pressure regulating tube 3 , and the plurality of hand-tightening anti-slip grooves 32 surround the outer surface of the pressure regulating tube 3 .

[0035] The hand-twisted anti-slip grooves 32 of the utility model can increase the friction between the pressure adjustment tube 3 and the welder's fingers, making it easier for the welder to rotate the pressure adjustment tube 3 to adjust the compression amount of the pressure adjustment tube 3 on the pressure spring 4, thereby quickly adjusting the welding pressure.

[0036] like Figure 1-5 As shown, as one of the preferred embodiments of the utility model, the shape of the trigger ring 22 is a groove sunken into the inner wall of the welding pen fixing tube 2, and the surface of the welding current switch 11 is provided with a trigger button 111 matching the trigger ring 22. The top of the trigger button 111 inside the welding current switch 11 is elastically abutted against the inner wall of the welding pen fixing tube 2 or the inner wall of the trigger ring 22.

[0037] The welding current switch 11 of the utility model is provided with elastic structures such as springs that cooperate with the trigger button 111, pressure sensors and other elements that control the connection and disconnection of the current. When the device is in a reset state, the top of the trigger button 111 extends into the trigger ring 22 and abuts against the inner wall thereof. When the welding pressure causes the welding pen fixing tube 2 to move downward until the trigger button 111 leaves the trigger ring 22, and the top of the trigger button 111 abuts against the welding pen fixing tube 2 so that it is squeezed into the welding current switch 11, the pressure sensor senses the pressure change and generates an electrical signal to turn on the welding current switch 11. The current flows to the front end of the welding needle through the welding trigger switch to weld the workpiece. After the workpieces are fused with each other, the welding pressure is withdrawn to make the welding pen fixing tube 2 move upward. The trigger button 111 will re-enter the range of the trigger ring 22 and its top abuts against the inner wall of the trigger ring 22 under the action of the elastic structure. The welding current switch 11 will disconnect the current to stop the resistance welding machine from welding. The utility model uses the welding pressure to cause the welding pen fixing tube 2 to move downward while triggering the welding current switch 11 for welding, which can improve the efficiency of welding the workpiece.

[0038] like Figure 1 As shown, as one of the preferred embodiments of the utility model, the rear end of the welding pen main rod 1 passes through the rear end of the welding pen fixing tube 2 and extends backward, the rear end of the welding pen main rod 1 is provided with an electrical interface 13, and the outer surface of the welding pen main rod 1 is provided with a line groove 14 extending from the electrical interface 13 to the welding current switch 11.

[0039] The electrical interface 13 of the utility model is used to connect with the power transmission line of the output current in the resistance welding machine. The electrical interface 13 can be fixed to the fixed port of the power transmission line by arranging a thread inside. After the power transmission line is fixed to the welding pen main rod 1, it continues to extend and is buried in the line groove 14, and finally extends to be electrically connected to the welding current switch 11. The line groove 14 can increase the flatness of the surface of the welding pen main rod 1. After the insulating structure such as the welding pen shell 5 is put on the surface of the welding pen main rod 1, the flatness of the surface of the welding pen shell 5 can be improved.

[0040] like Figure 8As shown, as a second preferred embodiment of the utility model, a fixing ring 23 is provided at the front end of the outer surface of the soldering pen fixing tube 2, the soldering pen fixing tube 2 is sleeved with a soldering pen shell 5 whose front end abuts against the fixing ring 23, and the inner wall of the soldering pen shell 5 and the outer surface of the soldering pen fixing tube 2 are provided with mutually matching threads.

[0041] The welding pen fixing tube 2 of the utility model is fixed to the welding pen shell 5 by mutually matching threads. The welding pen shell 5 is made of insulating material and serves as a gripping part for the welder when welding, which can prevent the welding current from injuring the welder. The front end of the welding pen shell 5 abuts against the fixing ring 23. Since the welder needs to apply downward welding pressure to the welding pen shell 5 during the welding process to make the welding pen fixing tube 2 move downward, the fixing ring 23 can make the welding pressure act on the welding pen fixing tube 2 better.

[0042] like Fig. 9 As shown, as a second preferred embodiment of the utility model, a mounting mechanism 6 is sleeved on the outer surface of the soldering pen fixing tube 2, and the inner wall of the mounting mechanism 6 and the outer surface of the soldering pen fixing tube 2 are provided with mutually matching threads.

[0043] The mounting mechanism 6 of the utility model is fixed to the soldering pen fixing tube 2 by mutually matching threads. The soldering pen fixing tube 2 is provided with a plurality of threaded holes on its surface. Fig.10 These threaded holes allow the mounting mechanism 6 to be fixed to the welding arm of the welding device 7 by fixing bolts. The welding device 7 is preferably a common resistance welding machine, so that the device is fixed to the welding device 7. When the workpiece is welded by the welding device 7, the welding pressure can be adjusted by the pressure adjustment tube 3 to improve the welding quality of the workpiece.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A resistance welding machine compression spring type welding needle pressure adjustment device, comprising a welding pen main rod (1), a welding pen fixing tube (2), and a pressure adjustment tube (3), characterized in that: The soldering pen fixing tube (2) and the pressure adjustment tube (3) are both sleeved on the outer surface of the soldering pen main rod (1); a pressure spring (4) sleeved on the outer surface of the soldering pen main rod (1) is arranged in the pressure adjustment tube (3); a limiting protrusion (21) is arranged on the inner wall of the soldering pen fixing tube (2); the rear end of the pressure spring (4) abuts against the limiting protrusion (21); the pressure adjustment tube (3) is located in front of the soldering pen fixing tube (2); the rear end of the pressure adjustment tube (3) extends into the soldering pen fixing tube (2) and abuts against the front end of the pressure spring (4); the inner wall of the pressure adjustment tube (3) and the outer surface of the soldering pen main rod (1) are provided with mutually matching threads; The inner wall of the welding pen fixing tube (2) is provided with a trigger ring (22) which is closed around a circle, and the outer surface of the welding pen main rod (1) is provided with a welding current switch (11) which matches the trigger ring (22).

2. The resistance welding machine compression spring type welding needle pressure adjustment device according to claim 1, characterized in that: The outer surface of the pressure adjustment tube (3) is provided with pressure adjustment scales (31), and the pressure adjustment scales (31) are evenly distributed along the extension direction of the pressure adjustment tube (3).

3. The resistance welding machine compression spring type welding needle pressure adjustment device according to claim 1, characterized in that: A plurality of hand-tightening anti-slip grooves (32) are provided at the front end of the outer surface of the pressure adjustment tube (3), and the plurality of hand-tightening anti-slip grooves (32) surround the outer surface of the pressure adjustment tube (3).

4. The resistance welding machine compression spring type welding needle pressure adjustment device according to claim 1, characterized in that: The trigger ring (22) is in the shape of a groove sunken into the inner wall of the welding pen fixing tube (2); a trigger button (111) matching the trigger ring (22) is provided on the surface of the welding current switch (11); and the top end of the trigger button (111) is in contact with the inner wall of the welding pen fixing tube (2) or the inner wall of the trigger ring (22) through elasticity inside the welding current switch (11).

5. The resistance welding machine compression spring type welding needle pressure adjustment device according to claim 1, characterized in that: The front end of the soldering pen main rod (1) penetrates the front end of the pressure adjustment tube (3) and extends forwards, and a soldering needle fixing hole (12) is provided at the front end of the soldering pen main rod (1).

6. The resistance welding machine compression spring type welding needle pressure adjustment device according to claim 1, characterized in that: The rear end of the welding pen main rod (1) penetrates the rear end of the welding pen fixing tube (2) and extends backwards, the rear end of the welding pen main rod (1) is provided with an electrical interface (13), and the outer surface of the welding pen main rod (1) is provided with a line groove (14) extending from the electrical interface (13) to the welding current switch (11).

7. The resistance welding machine compression spring type welding needle pressure adjustment device according to claim 1, characterized in that: A fixing ring (23) is provided at the front end of the outer surface of the soldering pen fixing tube (2); the soldering pen fixing tube (2) is sleeved with a soldering pen outer shell (5) whose front end abuts against the fixing ring (23); and the inner wall of the soldering pen outer shell (5) and the outer surface of the soldering pen fixing tube (2) are provided with mutually matching threads.

8. The resistance welding machine compression spring type welding needle pressure adjustment device according to claim 1, characterized in that: The outer surface of the soldering pen fixing tube (2) is sleeved with a mounting mechanism (6), and the inner wall of the mounting mechanism (6) and the outer surface of the soldering pen fixing tube (2) are provided with mutually matching threads.

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