P-type electric resistance welding gun for nut projection spot welding and welding robot

Abstract

The utility model belongs to the technical field of nut convex point welding, and particularly relates to a P-type electric resistance welding gun for nut convex point welding and a welding robot. The P-type resistance welding gun comprises a gun body assembly, a driving motor, a movable electrode arm, a static electrode arm, a nut retainer and a displacement sensor. The driving motor is in transmission connection with the movable electrode arm through a connecting rod structure, and a first convex spot welding electrode is arranged at the end of the movable electrode arm. A second convex spot welding electrode is arranged at the end part of the static electrode arm; the nut retainer is arranged to position and take out the salient point nut from a nut supply device; according to the P-type electric resistance welding gun, the salient point welding function is achieved, the P-type 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 P-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 P-type resistance welding gun and a welding robot 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 P-type resistance welding gun for spot welding of nuts, including a gun body assembly, a drive motor, a moving electrode arm, a stationary electrode arm, a nut retainer, and a displacement sensor:

[0006] The drive motor is located on the upper side of the gun body assembly. The drive motor is connected to the moving electrode arm via a connecting rod structure. The moving electrode arm is rotatably located on the upper side of the gun body assembly. A first protrusion welding electrode is provided at the end of the moving electrode arm.

[0007] The static electrode arm is fixedly disposed on the lower side of the gun body assembly, and a second protrusion welding electrode is disposed at the end of the static 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 static electrode arm with the welding pre-reserved 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 static electrode arm.

[0014] In one embodiment of this utility model, a first flexible connector and a second flexible connector are further included. The first flexible connector is connected between the moving electrode arm and the transformer, and the second flexible connector is connected between the stationary 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, the surfaces of both the moving electrode arm and the stationary electrode arm are provided with water pipe path limiting slots, and cooling water pipes are installed in the water pipe path limiting slots. The cooling water pipes installed on the moving electrode arm and the stationary electrode arm are connected to the cooling circulation device through cooling water distribution blocks.

[0019] In one embodiment of this utility model, the connecting rod structure includes: a rod body, a joint bearing, a rotating shaft, and a mounting base. One end of the rod body is connected to the joint bearing, and the other end is connected to the output end of the drive motor. The rotating shaft is mounted on the moving electrode arm via the mounting base, and the joint bearing is rotatably connected to the rotating shaft.

[0020] 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.

[0021] One embodiment of this utility model also discloses a welding robot, which includes a robot body and a resistance spot welding gun. The resistance spot welding gun is any one of the P-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.

[0022] The P-type resistance welding gun and welding robot for spot welding of nuts provided by this utility model can achieve the following technical effects:

[0023] 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.

[0024] 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 the connecting flange. 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

[0025] 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.

[0026] Figure 1 This is a schematic diagram showing the structure of the P-type resistance welding gun of this utility model;

[0027] Figure 2 This is a schematic diagram showing the internal structure of the P-type resistance welding gun of this utility model;

[0028] Figure 3 A schematic diagram showing the structure of the first bump welding electrode of this utility model;

[0029] Figure 4 This is a schematic diagram showing the structure of the second convex spot welding electrode of this utility model.

[0030] The symbols in the attached image are explained as follows:

[0031] 1- Gun body assembly;

[0032] 2-Drive motor;

[0033] 3-Moving electrode arm;

[0034] 4-Static electrode arm;

[0035] 5-Nut retainer; 51-Receiving hole;

[0036] 6-Displacement sensor;

[0037] 7-Connecting rod structure; 8-First convex welding electrode; 9-Second convex welding electrode; 10-Convex nut; 11-Transformer; 12-First flexible connector; 13-Second flexible connector; 14-Positioning pin; 15-Water pipe path limiting slot. Detailed Implementation

[0038] 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.

[0039] Example 1

[0040] Please refer to Figures 1-4 One embodiment of this utility model provides a P-type resistance welding gun for spot welding of nuts, including a gun body assembly 1, a drive motor 2, a moving electrode arm 3, a stationary electrode arm 4, a nut retainer 5, and a displacement sensor 6.

[0041] The drive motor 2 is disposed on the upper side of the gun body assembly 1. The drive motor 2 is connected to the moving electrode arm 3 through the connecting rod structure 7. The moving electrode arm 3 is rotatably disposed on the upper side of the gun body assembly 1. The end of the moving electrode arm 3 is provided with a first protrusion welding electrode 8.

[0042] The static electrode arm 4 is fixedly disposed on the lower side of the gun body assembly 1, and a second protrusion welding electrode 9 is disposed at the end of the static electrode arm 4. The second protrusion welding electrode 9 is coaxially disposed with the first protrusion welding electrode 8.

[0043] The nut retainer 5 is disposed at the end of the first protrusion welding electrode 8 and is used to position and remove the protrusion nut 10 from the nut supply device.

[0044] The displacement sensor 6 is disposed on the second protrusion welding electrode 9; when the resistance welding gun is aligned with the workpiece, the second protrusion welding electrode 9 abuts against the workpiece, and the displacement sensor 6 is used to detect the alignment of the static electrode arm 4 with the welding reserved hole on the workpiece.

[0045] Alternatively, after the resistance welding torch welding operation, the second protrusion welding electrode 9 abuts against the workpiece and the protrusion nut 10, and the displacement sensor 6 is used to detect the welding quality of the protrusion nut 10;

[0046] 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 10 against the welding point of the workpiece and apply a predetermined pressure.

[0047] Understandably, in this embodiment, the gun assembly 1 is moved by the robot to the nut supply device, and the drive motor 2 drives the moving electrode arm 3 to rotate around its axis, thereby moving the first protrusion welding electrode 8 downward and causing the nut holder 5 to be positioned from the nut supply device and take out a protrusion nut 10; then the gun assembly 1 is moved by the robot to the car body workpiece, aligned with the welding nut on the car body workpiece, and the displacement sensor 6 of the second protrusion welding electrode 9 provides feedback on whether the hole position of the car body workpiece is at the positioning pin 14 of the second protrusion welding electrode 9. After the displacement sensor 6 provides correct feedback, the servo drive motor 2 is started, so that the protrusion of the protrusion nut 10 is aligned with the workpiece and moved to the designated position and output pressure, and then the current is output through the transformer 11 for welding; after welding is completed, the position sensor at the second protrusion welding electrode 9 transmits the welding completion status, wherein completion is indicated by the position sensor at the second protrusion welding electrode 9 moving downward, and if not completed, the position of the position sensor at the second protrusion welding electrode 9 does not show obvious feedback, so the welding action is performed again.

[0048] 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 10 can be accurately abutted against the welding point of the workpiece and apply a predetermined pressure to complete the high-quality welding task.

[0049] The P-type resistance welding gun for nut spot welding provided in this embodiment can achieve the following technical effects:

[0050] 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.

[0051] 2. The integrated design of the nut retainer 5 and displacement sensor 6 simplifies the welding process and improves the adaptability and reliability of the equipment. In addition, by replacing the nut retainer 5 with different specifications, it can meet the welding needs of different workpieces or different specifications of protruding nuts 10, expand the application range, reduce production costs, and has high economic benefits and practicality.

[0052] Example 2

[0053] Please refer to Figures 1-4 Based on Embodiment 1, it further includes a transformer 11, which is disposed below the gun body assembly 1 and configured to output current to the static electrode arm 4; and

[0054] It also includes a first flexible connector 12 and a second flexible connector 13. The first flexible connector 12 is connected between the moving electrode arm 3 and the transformer 11, and the second flexible connector 13 is connected between the stationary electrode arm 4 and the transformer 11, so that the first convex welding electrode 8 and the second convex welding electrode 9 form a power-carrying circuit when the convex nut 10 abuts against the welding point of the workpiece.

[0055] Understandably, in this embodiment, the transformer 11 is located on the lower side of the gun body assembly 1 to output current to the stationary electrode arm 4. The first flexible connector 12 and the second flexible connector 13 connect the moving electrode arm 3 to the transformer 11 and the stationary electrode arm 4 to the transformer 11, respectively. That is, the transformer 11 provides current to the first convex spot welding electrode 8 and the second convex spot welding electrode 9 through the first flexible connector 12 and the second flexible connector 13, forming a power circuit. This ensures that the welding point where the convex nut 10 abuts against the workpiece is energized again to form a power circuit, thereby realizing the automation and precision of the welding process.

[0056] Example 3

[0057] Please refer to Figures 1-4Based on embodiment 1 or 2, the nut retainer 5 is provided with a receiving hole 51 that matches the protruding nut 10, for guiding the protruding nut 10 into and positioning it on the nut retainer 5;

[0058] The end of the second protrusion welding electrode 9 is provided with a positioning pin 14, which is coaxial with the receiving hole 51. The positioning pin 14 is used to position the protrusion nut 10 that enters the receiving hole 51.

[0059] Understandably, during the welding process, the nut retainer 5 positions and removes the protruding nut 10 from the nut supply device. The nut retainer 5 is provided with a receiving hole 51 that matches the protruding nut 10, which is used to guide the protruding nut 10 into and position it on the nut retainer 5, ensuring accurate use and placement of the nut. At the same time, the end of the second protruding welding electrode 9 is provided with a positioning pin 14, which is coaxial with the receiving hole 51 on the workpiece, and is used to accurately position the protruding nut 10 during welding, ensuring the accuracy of the welding position.

[0060] The positioning pin 14 is connected to the position sensor at the second convex welding electrode 9. After welding is completed, the position sensor at the second convex welding electrode 9 transmits the welding completion status through the position change of the positioning pin 14. If the welding is completed, the position sensor at the second convex welding electrode 9 moves down. If the welding is not completed, the position of the position sensor at the second convex welding electrode 9 does not show obvious feedback.

[0061] Example 4

[0062] Please refer to Figures 1-4 Based on embodiment 3, the surfaces of the moving electrode arm 3 and the stationary electrode arm 4 are provided with water pipe path limiting slots 15, and cooling water pipes are provided in the water pipe path limiting slots 15. The cooling water pipes provided in the moving electrode arm 3 and the stationary electrode arm 4 are connected to the cooling circulation device through cooling water distribution blocks.

[0063] Furthermore, the connecting rod structure 7 includes: a rod body, a joint bearing, a rotating shaft, and a mounting base. One end of the rod body is connected to the joint bearing, and the other end is connected to the output end of the drive motor 2. The rotating shaft is mounted on the moving electrode arm 3 via the mounting base, and the joint bearing is rotatably connected to the rotating shaft.

[0064] 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 10 so that a plurality of protruding nuts 10 are arranged in sequence. The pushing mechanism is located at the bottom of the material box and is used to push the protruding nut 10 to the material dispensing port of the material box.

[0065] Understandably, in this embodiment, the surfaces of both the moving electrode arm 3 and the stationary electrode arm 4 are provided with water pipe path restriction slots 15. The cooling water pipes installed in the slots are connected to the cooling circulation device through cooling water distribution blocks to ensure the cooling effect of the first convex welding electrode 8, the second convex welding electrode 9, the moving electrode arm 3, and the stationary electrode arm 4 during the welding process, thereby extending the service life of the electrodes. The connecting rod structure 7 allows the drive motor 2 to drive the moving electrode arm 3 to move more smoothly. The nut supply device adopts a spring clip structure, and the guide groove in the material box arranges the convex nuts 10 in sequence. The pushing mechanism pushes the nuts to the feeding port to realize the automated supply of nuts.

[0066] The P-type resistance welding gun for nut spot welding provided in this embodiment can achieve the following technical effects:

[0067] 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;

[0068] 2. The clip-type nut supply device realizes the automated and orderly supply of the protruding nut 10, which has high economic benefits and practicality.

[0069] Example 5

[0070] One embodiment of this utility model provides a welding robot, which includes a robot body and a resistance spot welding gun. The resistance spot welding gun is any one of the P-type resistance welding guns for nut protrusion welding described in the above-mentioned multiple solutions. The resistance spot welding gun includes a drive motor 2, a transformer 11 and a displacement sensor 6. The power lines and communication cables of the drive motor 2, the transformer 11 and the displacement sensor 6 are all connected to the robot body.

[0071] 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 P-type resistance welding gun for spot welding of nuts, characterized in that, Includes gun body assembly (1), drive motor (2), moving electrode arm (3), stationary electrode arm (4), nut retainer (5), and displacement sensor (6): The drive motor (2) is located on the upper side of the gun body assembly (1). The drive motor (2) is connected to the moving electrode arm (3) via a connecting rod structure (7). The moving electrode arm (3) is rotatably located on the upper side of the gun body assembly (1). The end of the moving electrode arm (3) is provided with a first protrusion welding electrode (8). The static electrode arm (4) is fixedly disposed on the lower side of the gun body assembly (1). The end of the static electrode arm (4) is provided with a second protrusion welding electrode (9). The second protrusion welding electrode (9) is coaxially disposed with the first protrusion welding electrode (8). The nut retainer (5) is disposed at the end of the first protrusion welding electrode (8) and is used to position and remove the protrusion nut (10) from the nut supply device; The displacement sensor (6) is disposed on the second bump welding electrode (9); The drive motor (2) is configured to abut the protruding nut (10) against the welding point of the workpiece and apply a predetermined pressure.

2. The P-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 (9) abuts against the workpiece, and the displacement sensor (6) is used to detect the alignment of the static electrode arm (4) with the welding reserved hole on the workpiece; Alternatively, after the resistance welding torch welding operation, the second convex welding electrode (9) abuts against the workpiece and the convex nut (10), and the displacement sensor (6) is used to detect the welding quality of the convex nut (10).

3. The P-type resistance welding torch for spot welding of nuts as described in claim 1, characterized in that, It also includes a transformer (11) disposed on the underside of the gun body assembly (1), the transformer (11) being configured to output current to the static electrode arm (4).

4. The P-type resistance welding torch for spot welding of nuts as described in claim 3, characterized in that, It also includes a first flexible connector (12) and a second flexible connector (13). The first flexible connector (12) is connected between the moving electrode arm (3) and the transformer (11), and the second flexible connector (13) is connected between the stationary electrode arm (4) and the transformer (11), so that the first convex welding electrode (8) and the second convex welding electrode (9) form an electrical circuit when the convex nut (10) abuts against the welding point of the workpiece.

5. The P-type resistance welding torch for spot welding of nuts as described in claim 1, characterized in that, The nut retainer (5) is provided with a receiving hole (51) that matches the convex nut (10) for guiding the convex nut (10) into and positioning it on the nut retainer (5).

6. The P-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 (9) is provided with a positioning pin (14), the positioning pin (14) is coaxial with the receiving hole (51), and the positioning pin (14) is used to position the protrusion nut (10) that enters the receiving hole (51).

7. The P-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 P-type resistance welding torch for spot welding of nuts as described in any one of claims 1-7, characterized in that, The surfaces of the moving electrode arm (3) and the stationary electrode arm (4) are provided with water pipe path limiting slots (15). Cooling water pipes are provided in the water pipe path limiting slots (15). The cooling water pipes provided in the moving electrode arm (3) and the stationary electrode arm (4) are connected to the cooling circulation device through cooling water distribution blocks.

9. The P-type resistance welding torch for spot welding of nuts as described in any one of claims 1-7, characterized in that, The connecting rod structure (7) includes: a rod body, a joint bearing, a rotating shaft, and a mounting base. One end of the rod body is connected to the joint bearing, and the other end is connected to the output end of the drive motor (2). The rotating shaft is mounted on the moving electrode arm (3) through the mounting base, and the joint bearing is rotatably connected to the rotating shaft.

10. A welding robot, characterized in that, The device includes a robot body and a resistance spot welding gun. The resistance spot welding gun is a P-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 (11), and a displacement sensor (6). The power lines and communication cables of the drive motor (2), the transformer (11), and the displacement sensor (6) are all connected to the robot body.

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