C-shaped electric resistance welding gun for convex spot welding of nuts and welding robot

Abstract

The utility model belongs to the technical field of nut convex point welding, and particularly relates to a C-shaped electric resistance welding gun for nut convex point welding and a welding robot. The resistance welding gun comprises a gun body assembly, a driving motor, an electrode arm, a nut retainer and a displacement sensor. The driving motor is arranged on the upper side of the gun body assembly, and a first protruding spot welding electrode is arranged at the driving end of the driving motor and slides along a guide structure in a directional mode. A second convex spot welding electrode is arranged at the end part of the electrode arm; the nut retainer is arranged to position and take out the salient point nut from a nut supply device; according to the C-shaped electric resistance welding gun, the convex point welding function is achieved, the C-shaped electric resistance welding gun is installed on a welding robot, the adaptability and efficiency of the electric resistance welding gun are greatly improved, the application range is wider, the nut retainer and the displacement sensor are installed on the gun body assembly in a modularized mode, and the welding efficiency is improved. Disassembly and maintenance are convenient.

Description

Technical Field

[0001] This utility model belongs to the field of nut protrusion welding technology, specifically relating to a C-type resistance welding gun and a welding robot used for nut protrusion welding. Background Technology

[0002] In the development of modern manufacturing, welding technology is the key to determining product quality and production efficiency. With the increasing requirements of manufacturing for precision, strength and efficiency, spot welding technology has gradually become an important breakthrough direction in the welding field. Spot welding is a special resistance spot welding method. It processes bumps on the contact surface of the workpiece. When current passes through, the bumps have high resistance and high current density, which quickly heats up and melts to form a weld.

[0003] Existing fixed spot welding guns have some obvious drawbacks in practical applications: First, their flexibility is severely limited. The fixed position and angle make them only suitable for welding workpieces of specific shapes and positions. Once the design or production process of the workpiece changes, the spot welding gun often needs to be redesigned and reinstalled, which is difficult and costly to adjust. Second, the maintenance cost of fixed spot welding guns is high. Due to their relatively complex structure, after long-term use, key components such as electrodes and transformers are prone to wear and failure. Repair is difficult and time-consuming, which can lead to production interruptions and increase downtime costs for enterprises. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a C-type resistance welding gun for nut spot welding, so as to solve the problems of poor flexibility, high maintenance cost and high maintenance difficulty of the prior art.

[0005] One embodiment of this utility model provides a C-type resistance welding gun for spot welding of nuts, including a gun body assembly, a drive motor, an electrode arm, a nut retainer, and a displacement sensor:

[0006] The drive motor is disposed on the upper side of the gun body assembly, and the drive end of the drive motor is provided with a first protrusion welding electrode, which slides directionally along the guide structure.

[0007] The electrode arm is fixedly disposed on the lower side of the gun body assembly, and a second protrusion welding electrode is provided at the end of the electrode arm. The second protrusion welding electrode is coaxially disposed with the first protrusion welding electrode.

[0008] The nut retainer is disposed at the end of the first protrusion welding electrode and is used to position and remove the protrusion nut from the nut supply device.

[0009] The displacement sensor is mounted on the second bump welding electrode;

[0010] The drive motor is configured to abut the protruding nut against the welding point of the workpiece and apply a predetermined pressure.

[0011] In one embodiment of this utility model, when the resistance welding gun is aligned with the workpiece, the second protrusion welding electrode abuts against the workpiece, and the displacement sensor is used to detect the alignment of the electrode arm with the welding pre-drilled hole on the workpiece;

[0012] Alternatively, after the resistance welding torch operation, the second protrusion welding electrode abuts against the workpiece and the protrusion nut, and the displacement sensor is used to detect the welding quality of the protrusion nut.

[0013] In one embodiment of this utility model, a transformer is also included, which is disposed on the lower side of the gun body assembly and is configured to output current to the electrode arm.

[0014] In one embodiment of this utility model, a first flexible connector and a second flexible connector are also included. The first flexible connector is connected between the first convex welding electrode and the transformer, and the second flexible connector is connected between the electrode arm and the transformer, so that the first convex welding electrode and the second convex welding electrode form an electrical circuit when the convex nut abuts against the welding point of the workpiece.

[0015] In one embodiment of this utility model, the nut retainer is provided with a receiving hole that matches the protruding nut, for guiding the protruding nut into and positioning it on the nut retainer.

[0016] In one embodiment of this utility model, a positioning pin is provided at the end of the second protrusion welding electrode. The positioning pin is coaxial with the receiving hole and is used to position the protrusion nut that enters the receiving hole.

[0017] In one embodiment of this utility model, the drive motor is a servo drive motor, and the servo drive motor is equipped with an encoder.

[0018] In one embodiment of this utility model, a cooling water pipe is provided on the outer side of the electrode arm, and the cooling water pipe is connected to the cooling circulation device through a cooling water distribution block.

[0019] The electrode arm has a water pipe path limiting groove along its surface so that the cooling water pipe is embedded in the surface of the electrode arm.

[0020] In one embodiment of this utility model, the guide structure includes: a mounting plate, a slide rail, and a slider. The mounting plate is horizontally mounted on the gun body assembly, the slide rail is disposed on the lower surface of the mounting plate, and the slider is slidably disposed along the slide rail. The first spot welding electrode is mounted on the slider via a connecting plate.

[0021] In one embodiment of this utility model, the nut supply device is configured as a clip-type structure. The nut supply device includes at least a material box and a pushing mechanism. The material box is provided with a guide groove that matches the protruding nuts so that a plurality of protruding nuts are arranged in sequence. The pushing mechanism is located at the bottom of the material box and is used to push the protruding nuts to the material dispensing port of the material box.

[0022] In one embodiment of this utility model, a welding robot is also provided, including a robot body and a resistance spot welding gun. The resistance spot welding gun is any one of the C-type resistance welding guns for nut protrusion welding described in the above embodiments. The resistance spot welding gun includes a drive motor, a transformer, and a displacement sensor. The power lines and communication cables of the drive motor, the transformer, and the displacement sensor are all connected to the robot body.

[0023] The C-type resistance welding gun and welding robot for spot welding of nuts provided by this utility model can achieve the following technical effects:

[0024] 1. By integrating projection welding technology into a conventional resistance spot welding gun, the precise coordination of the drive motor, nut retainer, and displacement sensor enables full automation of the entire process from projection nut picking and pressure application to resistance welding. Furthermore, the coaxially arranged first and second projection welding electrodes ensure the formation of high-quality weld joints on the workpiece during the welding process, effectively guaranteeing the accuracy of welding pressure and position. In addition, the displacement sensor monitors the welding status of the projection nut in real time, accurately detecting whether it is firmly welded, effectively eliminating problems such as incomplete welds and insufficient weld strength, and significantly improving welding quality.

[0025] 2. By integrating the nut retainer and displacement sensor into the gun body assembly, the integrated gun body assembly can realize the projection welding function. The gun body assembly can be easily installed on the welding robot through connecting flanges and other components. With the advantages of the robot's high flexibility and precise motion control, fine welding actions can be completed even in complex spaces, which greatly improves the adaptability and efficiency of the projection resistance welding gun and makes it more widely applicable. The nut retainer and displacement sensor are modularly installed on the gun body assembly, which is convenient for disassembly and maintenance. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 A schematic diagram showing the structure of the C-type resistance welding gun of this utility model;

[0028] Figure 2 A schematic diagram showing the internal structure of the C-type resistance welding gun of this utility model;

[0029] Figure 3 A schematic diagram showing the structure of the first bump welding electrode of this utility model;

[0030] Figure 4 This is a schematic diagram showing the structure of the second convex spot welding electrode of this utility model.

[0031] The symbols in the attached image are explained as follows:

[0032] 1- Gun body assembly;

[0033] 2-Drive motor;

[0034] 3-Electrode arm; 31-Water pipe path restriction slot;

[0035] 4-Nut retainer;

[0036] 5-Displacement sensor;

[0037] 6 - First bump welding electrode;

[0038] 7-Second protrusion welding electrode;

[0039] 8-Protruding nut; 9-Transformer; 10-First flexible connector; 11-Second flexible connector; 12-Positioning pin; 13-Mounting plate; 14-Slide rail; 15-Slider; Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] Example 1

[0042] Please refer to Figures 1-4 One embodiment of this utility model provides a C-type resistance welding gun for spot welding of nuts, including a gun body assembly 1, a drive motor 2, an electrode arm 3, a nut retainer 4, and a displacement sensor 5.

[0043] The drive motor 2 is disposed on the upper side of the gun body assembly 1, and the drive end of the drive motor 2 is provided with a first protrusion welding electrode 6, which slides directionally along the guide structure.

[0044] The electrode arm 3 is fixedly disposed on the lower side of the gun body assembly 1, and a second protrusion welding electrode 7 is disposed at the end of the electrode arm 3. The second protrusion welding electrode 7 is coaxially disposed with the first protrusion welding electrode 6.

[0045] The nut retainer 4 is disposed at the end of the first protrusion welding electrode 6 and is used to position and remove the protrusion nut 8 from the nut supply device.

[0046] The displacement sensor 5 is disposed on the second protrusion welding electrode 7; when the resistance welding gun is aligned with the workpiece, the second protrusion welding electrode 7 abuts against the workpiece, and the displacement sensor 5 is used to detect the alignment of the electrode arm 3 with the welding reserved hole on the workpiece;

[0047] Alternatively, after the resistance welding torch welding operation, the second protrusion welding electrode 7 abuts against the workpiece and the protrusion nut 8, and the displacement sensor 5 is used to detect the welding quality of the protrusion nut 8;

[0048] The drive motor 2 is a servo drive motor 2, which is equipped with an encoder. The drive motor 2 is configured to abut the protruding nut 8 against the welding point of the workpiece and apply a predetermined pressure.

[0049] Understandably, in this embodiment, the gun assembly 1 is moved by the robot to the nut supply device, and the first protrusion welding electrode 6 is driven by the drive motor 2 to move horizontally, so that the nut holder 4 is positioned from the nut supply device and takes out a protrusion nut 8; then the gun assembly 1 is moved by the robot to the car body workpiece, aligned with the car body workpiece to weld the nut, and the displacement sensor 5 of the second protrusion welding electrode 7 provides feedback on whether the hole position of the car body workpiece is at the positioning pin 12 of the second protrusion welding electrode 7. After the displacement sensor 5 provides correct feedback, the servo drive motor 2 is started, so that the protrusion of the protrusion nut 8 is aligned with the workpiece and moved to the designated position and output pressure, and then the current is output through the transformer 9 for welding; after welding is completed, the position sensor at the second protrusion welding electrode 7 transmits the welding completion status, wherein completion is indicated by the position sensor at the second protrusion welding electrode 7 moving down, and if not completed, the position of the position sensor at the second protrusion welding electrode 7 does not show obvious feedback, so the welding action is performed again.

[0050] Among them, the drive motor 2 is a servo drive motor 2, equipped with an encoder to achieve precise position and speed control, ensuring that the protruding nut 8 can be accurately abutted against the welding point of the workpiece and apply a predetermined pressure to complete the high-quality welding task.

[0051] The C-type resistance welding gun for spot welding of nuts provided by this utility model can achieve the following technical effects:

[0052] 1. By integrating projection welding technology into the resistance spot welding gun, the welding process is automated and precise, significantly improving welding quality and efficiency. Through the precise control of the servo drive motor 2 and encoder, the accuracy of welding pressure and position is ensured, effectively avoiding problems such as incomplete welding or insufficient welding strength.

[0053] 2. The integrated design of the nut retainer 4 and displacement sensor 5 simplifies the welding process and improves the adaptability and reliability of the equipment. In addition, by replacing the nut retainer 4 with different specifications, it can meet the welding needs of different workpieces or different specifications of convex nuts 8, expand the application range, reduce production costs, and has high economic benefits and practicality.

[0054] Example 2

[0055] Please refer to Figures 1-4 Based on Embodiment 1, it further includes a transformer 9, which is disposed below the gun body assembly 1 and configured to output current to the electrode arm 3; and

[0056] It also includes a first flexible connector 10 and a second flexible connector. The first flexible connector 10 is connected and disposed between the first convex welding electrode 6 and the transformer 9, and the second flexible connector 11 is connected and disposed between the electrode arm 3 and the transformer 9, so that the first convex welding electrode 6 and the second convex welding electrode 7 form an electrical circuit when the convex nut 8 abuts against the welding point of the workpiece.

[0057] Understandably, in this embodiment, the transformer 9 is located on the lower side of the gun body assembly 1 to output current to the electrode arm 3. The first flexible connector 10 and the second flexible connector 11 connect the first convex welding electrode 6 to the transformer 9 and the electrode arm 3 to the transformer 9, respectively. That is, the transformer 9 provides current to the first convex welding electrode 6 and the second convex welding electrode 7 through the first flexible connector 10 and the second flexible connector 11, forming a power circuit. This ensures that the welding point where the convex nut 8 abuts against the workpiece is energized again to form a power circuit, thereby realizing the automation and precision of the welding process.

[0058] Example 3

[0059] Please refer to Figures 1-4 Based on Embodiment 1 or Embodiment 2, the nut retainer 4 is provided with a receiving hole that matches the protruding nut 8, for guiding the protruding nut 8 into and positioning it on the nut retainer 4;

[0060] The end of the second protrusion welding electrode 7 is provided with a positioning pin 12, which is coaxial with the receiving hole and is used to position the protrusion nut 8 that enters the receiving hole.

[0061] Understandably, during the welding process, the nut retainer 4 positions and removes the protruding nut 8 from the nut supply device. The nut retainer 4 is provided with a receiving hole that matches the protruding nut 8, which is used to guide the protruding nut 8 into and position it on the nut retainer 4, ensuring accurate use and placement of the nut. At the same time, the end of the second protruding welding electrode 7 is provided with a positioning pin 12, which is coaxial with the receiving hole on the workpiece, and is used to accurately position the protruding nut 8 during welding, ensuring the accuracy of the welding position.

[0062] The positioning pin 12 is connected to the position sensor at the second convex welding electrode 7. After welding is completed, the position sensor at the second convex welding electrode 7 transmits the welding completion status through the position change of the positioning pin 12. If the welding is completed, the position sensor at the second convex welding electrode 7 moves down. If the welding is not completed, the position of the position sensor at the second convex welding electrode 7 does not show obvious feedback.

[0063] Example 4

[0064] Please refer to Figures 1-4 Based on embodiment 3, a cooling water pipe is provided on the outer side of the electrode arm 3, and the cooling water pipe is connected to the cooling circulation device through a cooling water distribution block; wherein, a water pipe path limiting groove 31 is provided along the surface of the electrode arm 3 so that the cooling water pipe is embedded in the surface of the electrode arm 3.

[0065] Furthermore, the guide structure includes: a mounting plate 13, a slide rail 14, and a slider 15. The mounting plate 13 is horizontally mounted on the gun body assembly 1. The slide rail 14 is disposed on the lower surface of the mounting plate 13. The slider 15 is slidably disposed along the slide rail 14. The first bump welding electrode 6 is mounted on the slider 15 via a connecting plate.

[0066] The nut supply device is configured as a clip-type structure. The nut supply device includes at least a material box and a pushing mechanism. The material box is provided with a guide groove that matches the protruding nut 8 so that a plurality of protruding nuts 8 are arranged in sequence. The pushing mechanism is located at the bottom of the material box and is used to push the protruding nut 8 to the material dispensing port of the material box.

[0067] Understandably, in this embodiment, the surface of the electrode arm 3 is provided with a water pipe path limiting groove 31. The cooling water pipes set in the groove are connected to the cooling circulation device through the cooling water distribution block to ensure the cooling effect of the electrode during the welding process and extend the service life of the first convex welding electrode 6, the second convex welding electrode 7 and the electrode arm 3. The introduction of the guide structure further ensures the smoothness and accuracy of the movement of the first convex welding electrode 6. The nut supply device adopts a spring clip structure, and the guide groove in the material box arranges the convex nuts 8 in sequence. The pushing mechanism pushes the nuts to the feeding port to realize the automated supply of nuts.

[0068] The C-type resistance welding gun for nut spot welding provided in this embodiment can achieve the following technical effects:

[0069] 1. The installation of cooling water pipes and cooling circulation devices effectively solves the problem of electrode overheating during welding, improving the service life of the electrodes and the stability of the welding process;

[0070] 2. The clip-type nut supply device realizes the automated and orderly supply of the protruding nut 8, which has high economic benefits and practicality.

[0071] Example 5

[0072] One embodiment of this utility model provides a welding robot, including a robot body and a resistance spot welding gun. The resistance spot welding gun is any one of the C-type resistance welding guns for nut protrusion welding described in the above embodiments. The resistance spot welding gun includes a drive motor 2, a transformer 9 and a displacement sensor 5. The power lines and communication cables of the drive motor 2, the transformer 9 and the displacement sensor 5 are all connected to the robot body.

[0073] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A C-type resistance welding gun for spot welding of nuts, characterized in that, Includes gun body assembly (1), drive motor (2), electrode arm (3), nut retainer (4), and displacement sensor (5): The drive motor (2) is disposed on the upper side of the gun body assembly (1), and the drive end of the drive motor (2) is provided with a first protrusion welding electrode (6), which slides directionally along the guide structure. The electrode arm (3) is fixedly disposed on the lower side of the gun body assembly (1), and a second protrusion welding electrode (7) is disposed at the end of the electrode arm (3). The second protrusion welding electrode (7) is coaxially disposed with the first protrusion welding electrode (6). The nut retainer (4) is disposed at the end of the first protrusion welding electrode (6) and is used to position and remove the protrusion nut (8) from the nut supply device; The displacement sensor (5) is disposed on the second bump welding electrode (7); The drive motor (2) is configured to abut the protruding nut (8) against the welding point of the workpiece and apply a predetermined pressure.

2. The C-type resistance welding torch for spot welding of nuts as described in claim 1, characterized in that, When the resistance welding gun is aligned with the workpiece, the second protrusion welding electrode (7) abuts against the workpiece, and the displacement sensor (5) is used to detect the alignment of the electrode arm (3) with the welding pre-drilled hole on the workpiece; Alternatively, after the resistance welding torch welding operation, the second convex welding electrode (7) abuts against the workpiece and the convex nut (8), and the displacement sensor (5) is used to detect the welding quality of the convex nut (8).

3. The C-type resistance welding torch for spot welding of nuts as described in claim 1, characterized in that, It also includes a transformer (9) disposed on the underside of the gun body assembly (1), the transformer (9) being configured to output current to the electrode arm (3).

4. The C-type resistance welding gun for spot welding of nuts as described in claim 3, characterized in that, It also includes a first flexible connector (10) and a second flexible connector (11). The first flexible connector (10) is connected between the first convex welding electrode (6) and the transformer (9), and the second flexible connector (11) is connected between the electrode arm (3) and the transformer (9), so that the first convex welding electrode (6) and the second convex welding electrode (7) form an electrical circuit when the convex nut (8) abuts against the welding point of the workpiece.

5. The C-type resistance welding torch for spot welding of nuts as described in claim 1, characterized in that, The nut retainer (4) is provided with a receiving hole that matches the protruding nut (8) for guiding the protruding nut (8) into and positioning it on the nut retainer (4).

6. The C-type resistance welding torch for spot welding of nuts as described in claim 5, characterized in that, The end of the second protrusion welding electrode (7) is provided with a positioning pin (12), the positioning pin (12) is coaxial with the receiving hole, and the positioning pin (12) is used to position the protrusion nut (8) that enters the receiving hole.

7. The C-type resistance welding torch for spot welding of nuts as described in claim 1, characterized in that, The drive motor (2) is a servo drive motor (2), and the servo drive motor (2) is equipped with an encoder.

8. The C-type resistance welding torch for spot welding of nuts as described in any one of claims 1-7, characterized in that, A cooling water pipe is provided on the outside of the electrode arm (3), and the cooling water pipe is connected to the cooling circulation device through a cooling water distribution block; The electrode arm (3) is provided with a water pipe path limiting groove (31) so that the cooling water pipe is embedded in the surface of the electrode arm (3).

9. The C-type resistance welding torch for spot welding of nuts as described in any one of claims 1-7, characterized in that, The guide structure includes: a mounting plate (13), a slide rail (14), and a slider (15). The mounting plate (13) is horizontally mounted on the gun body assembly (1). The slide rail (14) is disposed on the lower surface of the mounting plate (13). The slider (15) is slidably disposed along the slide rail (14). The first protrusion welding electrode (6) is mounted on the slider (15) through a connecting plate.

10. A welding robot, characterized in that, The system includes a robot body and a resistance spot welding gun. The resistance spot welding gun is a C-type resistance welding gun for nut protrusion welding as described in any one of claims 1-9. The resistance spot welding gun includes a drive motor (2), a transformer (9), and a displacement sensor (5). The power lines and communication cables of the drive motor (2), the transformer (9), and the displacement sensor (5) are all connected to the robot body.

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