Resistance welding device for manufacturing hexagonal welding nuts for automobiles

Abstract

The application discloses a resistance welding device for manufacturing hexagonal welding nuts for automobiles in the technical field of resistance welding, which comprises a base, an upper electrode and a lower electrode; a welding plate is arranged on the surface of the lower electrode; during the welding process of the welding nut, the positioning mechanism guides and positions the position of the welding nut, so that the welding nut can be moved to the lower side of the upper electrode and aligned with the upper electrode before the upper electrode is pressed down, the upper electrode is ensured to be in the middle position of the welding nut, the pressure on the welding nut when the upper electrode is pressed down can be uniformly distributed, the inclination of the welding nut is avoided, and when the upper electrode presses down the welding nut, the detection mechanism is used to detect whether the welding nut is kept horizontal, so that the upper electrode and the lower electrode can be electrified to weld the welding nut and the welding plate only when the welding nut is kept horizontal, the welding nut can be kept horizontal during the welding process, and the stability of the welding is ensured.

Description

Technical Field

[0001] This invention relates to the field of resistance welding technology, specifically to a resistance welding apparatus for manufacturing hexagonal weld nuts for automobiles. Background Technology

[0002] Resistance welding is widely used in the automotive manufacturing industry due to its efficient connection, especially for exterior panels where aesthetics are important. A common method is to weld nuts to the inside of the sheet metal using resistance welding to facilitate the connection between the sheet metal and other parts.

[0003] However, during the process of pressing the upper electrode down on the welding nut, due to the difference in the strength of the weld leg and the difference in the coaxiality between the upper electrode and the nut, misalignment can easily occur between the upper electrode and the welding nut (e.g. Figure 1 As shown, L1 and L2 are the distances from the workpiece on both sides of the welding nut, and ΔL is the difference between L1 and L2. The side of the welding nut corresponding to the upper electrode will be subjected to a large downward pressure, which will cause the welding nut to tilt. This will lead to problems such as: poor contact and incomplete welding after welding; difficulty in subsequent assembly due to nut tilt; and reduced contact area between the upper electrode and the welding nut, resulting in increased resistance and higher resistance heat when current passes through, which may cause the upper electrode and the welding nut to stick together. Summary of the Invention

[0004] The purpose of this invention is to provide a resistance welding apparatus for manufacturing hexagonal weld nuts for automobiles, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a resistance welding device for manufacturing hexagonal weld nuts for automobiles, comprising a base, an upper electrode, and a lower electrode; A welding plate is placed on the surface of the lower electrode, and a welding nut is placed on the surface of the welding plate. A positioning mechanism is provided on the surface of the upper electrode. The positioning mechanism is used to guide and position the welding nut so that the welding nut can be accurately aligned with the upper electrode before it is pressed down. A detection mechanism is provided at the bottom of the upper electrode. The detection mechanism includes multiple detection contacts. The detection mechanism is used to detect the horizontal state of the upper end of the welding nut through the multiple detection contacts when the upper electrode presses down on the welding nut. The upper electrode can be energized when the multiple detection contacts are pressed down simultaneously.

[0006] As a further embodiment of the present invention, the positioning mechanism includes a plurality of arc-shaped positioning blocks arranged at equal angles on the surface of the upper electrode, wherein the bottom of the positioning blocks is an inclined surface.

[0007] As a further embodiment of the present invention, a C-shaped flattening block is elastically slidably connected to the surface of the upper electrode via a fixing ring, the positioning block is located inside the flattening block, and the flattening block is used to press down the welding plate.

[0008] As a further embodiment of the present invention, the detection mechanism includes a sliding rod that is elastically slidably connected to the bottom of the upper electrode by a spring. A detection disk made of conductive material is hinged to the bottom of the sliding rod. The bottom of the upper electrode has a plurality of detection holes arranged at equal angles. A plurality of detection contacts are respectively installed in the plurality of detection holes. A pressure block extending from the bottom to the space between the upper electrode and the detection disk is elastically slidably connected in the detection hole. When the detection disk is in a horizontal state and moves upward, it can squeeze the plurality of detection contacts through the plurality of pressure blocks. When the plurality of detection contacts are squeezed simultaneously, the upper electrode can be energized.

[0009] As a further embodiment of the present invention, the positioning block is radially elastically slidable on the surface of the upper electrode, and a pushing block with an inclined bottom is fixedly connected to the side of the positioning block near the upper electrode. The pushing block is located between the upper electrode and the detection disk. When the detection disk moves upward, it can push the positioning block to move away from the upper electrode by the pushing block.

[0010] As a further embodiment of the present invention, a guide block is fixedly connected to the surface of the positioning block near the upper electrode. A V-shaped guide groove is formed on the surface of the guide block. The guide groove is used to guide and adjust the position of the welding nut by means of the side edge of the welding nut. The detection plate is hexagonal like the welding nut. The side lengths of the guide block on both sides of the guide groove are different, and the inner wall lengths on both sides of the guide groove are different.

[0011] As a further embodiment of the present invention, a jacking block with an inclined bottom is fixedly connected to the inner side of the flattening block. When the flattening block presses down on the welding plate, the jacking block is located on one side of the positioning block, and the positioning block can push the flattening block upward through the jacking block.

[0012] As a further embodiment of the present invention, a support disk is provided on the surface of the lower electrode.

[0013] As a further embodiment of the present invention, the support plate is elastically slidable on the surface of the lower electrode, and an insulating fixing plate is fixedly connected to the surface of the support plate. A retractable extension rod is slidably connected to the surface of the fixing plate through an inclined groove. The extension rod extends to the surface of the positioning block and is slidably connected to the surface of the positioning block. When the positioning block moves away from the upper electrode, it can drive the extension rod to move in the inclined groove.

[0014] As a further embodiment of the present invention, a limiting ring for limiting the position of the support disk is fixedly connected to the surface of the lower electrode.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In the welding process of the present invention, the positioning mechanism guides and positions the welding nut, enabling it to move below and align with the upper electrode before it is pressed down. This ensures the upper electrode is in the center of the welding nut, allowing for even pressure distribution when the upper electrode presses down, preventing the welding nut from tilting. Furthermore, when the upper electrode presses down on the welding nut, a detection mechanism checks whether the welding nut remains horizontal. Only when the welding nut is horizontal can the upper and lower electrodes be energized to weld the welding nut to the welding plate, thus ensuring the welding nut remains horizontal during welding and guaranteeing welding stability.

[0016] In this invention, during the downward movement of the upper electrode to press down on the welding nut, the positioning block first moves to the position of the welding nut, and then the welding nut moves to the bottom of the detection plate under the guidance of the positioning block. This ensures that the welding nut and the detection plate can be accurately aligned, so that the downward pressure of the upper electrode on the welding nut can be evenly distributed, thereby ensuring that the welding point pressure is the same during welding and ensuring a firm weld.

[0017] In the welding process of the welding nut, this invention uses an upper detection plate and detection contacts to detect the welding nut. When multiple pressure blocks press down on the detection contacts in the detection holes, it indicates that the detection plate is in a horizontal state and the upper electrode can be connected to the external circuit. After the pressure between the upper and lower electrodes reaches the preset pressure, the welding nut and welding plate can be energized for welding. This ensures that the welding nut and welding plate are pressed down to a horizontal position before energizing for welding, guaranteeing tight contact between the welding nut and welding plate and ensuring the horizontality of the welding nut. This improves the stability of the welding process and prevents the welding nut from tilting, which could lead to incomplete welds and affect the connection stability of the welding nut and subsequent normal assembly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the upper electrode pressing down on different positions of the welding nut (L1 and L2 are the distances from the workpiece to both sides of the welding nut, ΔL is the difference between L1 and L2, and R is the groove formed by the pressure deformation of the welding plate). Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the overall cross-section of the present invention; Figure 4 for Figure 3 Schematic diagram of the structure at point A in the middle; Figure 5 for Figure 3 Schematic diagram of the structure at point B; Figure 6This is a schematic diagram showing the positional relationship between the upper electrode, the positioning block, and the detection disk in this invention; Figure 7 This is a schematic diagram showing the positional relationship between the upper electrode, positioning block, guide block, and pushing block in this invention. Figure 8 This is a schematic diagram showing the positional relationship between the detection disk, the push block, and the guide block in this invention; Figure 9 This is a schematic diagram showing the connection relationship between the positioning block, the pushing block, and the guiding block in this invention; Figure 10 This is a force diagram of guide blocks with different side lengths when the welding nut is in the same position (F1 and F2 in the diagram are the squeezing forces on the side edge of the welding nut by the guide groove, and V is the rotation direction of the welding nut under the action of F1). Figure 11 This is a schematic diagram showing the connection relationship between the positioning block, the extension rod, and the fixing plate in this invention.

[0019] The attached diagram lists the components represented by each number as follows: 1-Base, 2-Upper electrode, 3-Lower electrode, 4-Welding plate, 5-Welding nut, 6-Sliding rod, 7-Detection plate, 8-Detection hole, 9-Detection contact, 10-Pressure block, 11-Positioning block, 12-Pushing block, 13-Guide block, 14-Guide groove, 15-Fixing ring, 16-Flattening block, 17-Pushing block, 18-Support plate, 19-Fixing plate, 20-Inclined groove, 21-Extension rod, 22-Limiting ring. Detailed Implementation

[0020] Please see Figures 1-11 The present invention provides a technical solution: a resistance welding device for manufacturing hexagonal welding nuts for automobiles, comprising a base 1, an upper electrode 2 and a lower electrode 3; A welding plate 4 is placed on the surface of the lower electrode 3, and a welding nut 5 is placed on the surface of the welding plate 4. A positioning mechanism is provided on the surface of the upper electrode 2. The positioning mechanism is used to guide and position the welding nut 5 so that the welding nut 5 can be accurately aligned with the upper electrode 2 before it is pressed down. A detection mechanism is provided at the bottom of the upper electrode 2. The detection mechanism includes multiple detection contacts 9. The detection mechanism is used to detect whether the upper end of the welding nut 5 is horizontal by the squeezing state of the multiple detection contacts 9 when the upper electrode 2 presses down on the welding nut 5. The upper electrode 2 can be energized when the multiple detection contacts 9 are squeezed at the same time. During the welding process of the welding nut 5, the welding plate 4 and the welding nut 5 need to be placed on the surface of the lower electrode 3 in sequence. Then, the upper electrode 2 moves downward, and the positioning mechanism moves downward synchronously. The positioning mechanism can guide and position the welding nut 5 so that the welding nut 5 can move below the upper electrode 2 and align with it before the upper electrode 2 is pressed down, ensuring that the upper electrode 2 is in the middle position of the welding nut 5. This allows the pressure on the welding nut 5 when the upper electrode 2 is pressed down to be evenly distributed, preventing the welding nut 5 from tilting. Then, when the upper electrode 2 presses down on the welding nut 5, the detection mechanism first contacts the welding nut 5, and the detection contact 9 is squeezed. When multiple detection contacts 9 are squeezed, the welding nut 5 is in a horizontal state. At this time, the upper electrode 2 and the lower electrode 3 can be energized to weld the welding nut 5 and the welding plate 4, thereby ensuring that the welding nut 5 can remain horizontal during welding and ensuring the stability of the welding.

[0021] As a further embodiment of the present invention, the positioning mechanism includes a plurality of arc-shaped positioning blocks 11 disposed at equal angles on the surface of the upper electrode 2, and the bottom of the positioning block 11 is a slope. During the process of the upper electrode 2 moving downward to press down on the welding nut 5, the positioning block 11 first moves to the position of the welding nut 5, and then the welding nut 5 moves to the bottom of the detection plate 7 under the guidance of the positioning block 11, so that the welding nut 5 and the detection plate 7 can be accurately aligned, so that the downward pressure of the upper electrode 2 pressing down on the welding nut 5 can be evenly distributed, thereby ensuring that the welding point pressure is the same when welding the welding nut 5, and ensuring that the welding is firm.

[0022] As a further embodiment of the present invention, the detection mechanism includes a sliding rod 6 that is elastically slidably connected to the bottom of the upper electrode 2 by a spring. A detection disk 7 made of conductive material is hinged to the bottom of the sliding rod 6. A plurality of detection holes 8 arranged at equal angles are opened at the bottom of the upper electrode 2. A plurality of detection contacts 9 are respectively installed in the plurality of detection holes 8. A pressure block 10 extending from the bottom to the space between the upper electrode 2 and the detection disk 7 is elastically slidably connected in the detection hole 8. When the detection disk 7 is in a horizontal state and moves upward, the plurality of detection contacts 9 can be squeezed by the plurality of pressure blocks 10. When the plurality of detection contacts 9 are squeezed at the same time, the upper electrode 2 can be energized. During the welding process of the welding nut 5, after the upper electrode 2 drives the bottom detection plate 7 to adhere to the surface of the welding nut 5, as the upper electrode 2 continues to move, the distance between the detection plate 7 and the welding nut 5 gradually decreases. The detection plate 7, sliding rod 6 and pressure block 10 are squeezed and moved closer to the upper electrode 2. The pressure block 10 moves into the detection hole 8. When multiple pressure blocks 10 press down the detection contact 9 in the detection hole 8, it indicates that the detection plate 7 is in a horizontal state, and the upper electrode 2 can be connected to the external circuit. After the pressure between the upper electrode 2 and the lower electrode 3 reaches the preset pressure, the welding nut 5 and the welding plate 4 can be electrically welded. This allows the welding nut 5 and the welding plate 4 to be electrically welded after being pressed down to a horizontal position, ensuring close contact between the welding nut 5 and the welding plate 4 and the horizontal position of the welding nut 5, improving the stability of the welding, and avoiding the welding nut 5 from tilting, which could lead to incomplete welding of the welding point, affecting the connection stability of the welding nut 5 and subsequent normal assembly.

[0023] During the welding process of the welding nut 5, the positioning block 11 remains in contact with the welding nut 5. The current passes between the positioning block 11 and the welding nut 5, which easily generates heat between the welding nut 5 and the positioning block 11, thereby causing the positioning block 11 to connect with the welding plate 4. As a further embodiment of the present invention, the positioning block 11 slides radially elastically on the surface of the upper electrode 2. A push block 12 with a sloping bottom is fixedly connected to the side of the positioning block 11 near the upper electrode 2. The push block 12 is located between the upper electrode 2 and the detection disk 7. When the detection disk 7 moves upward, it can push the positioning block 11 to move away from the upper electrode 2 through the push block 12. During the pressing and positioning of the welding nut 5, the positioning block 11 first guides and positions the welding nut 5. Then, after the detection disc 7 contacts the welding nut 5 and continues to move downward, the detection disc 7, blocked by the welding nut 5, pushes the sliding rod 6 to move upward along the upper electrode 2. The detection disc 7 then squeezes the pushing block 12, causing the pushing block 12 and the positioning block 11 to move away from the welding nut 5. This allows the positioning block 11 to detach from the welding nut 5 after it is pressed and fixed, preventing the current from generating heat when welding the welding nut 5 through the positioning block 11 and the welding nut 5. This would not only prevent the positioning block 11 from connecting with the welding nut 5, but also prevent the threads from deforming when the welding nut 5 generates heat on its side, thus causing thread failure and affecting the normal use of the nut.

[0024] During the positioning of the welding nut 5, the side edge and side surface of the welding nut 5 are in different positions. When the positioning block 11 positions the welding nut 5, the different guiding positions can easily cause the welding nut 5 to be in different positions. As a further solution of the present invention, a guide block 13 is fixedly connected to the surface of the positioning block 11 near the upper electrode 2. A V-shaped guide groove 14 is opened on the surface of the guide block 13. The guide groove 14 is used to guide and adjust the position of the welding nut 5 through the side edge of the welding nut 5. The detection disk 7 is the same hexagon as the welding nut 5. The side lengths of the guide block 13 on both sides of the guide groove 14 are different, and the inner wall lengths on both sides of the guide groove 14 are different. During the positioning process of the welding nut 5, as the upper electrode 2 moves downward to guide and position the welding nut 5, the side edge of the welding nut 5 moves under the action of the guide groove 14, so that the side edge of the welding nut 5 moves towards the positioning block 11, thereby ensuring that the positioning block 11 can guide and position the welding nut 5 through the side edge of the welding nut 5, improving the positioning accuracy. Subsequently, the welding nut 5 can move to the bottom of the detection plate 7. The hexagonal detection plate 7 can adapt to the guide block 13 and the guide groove 14, and can cover the upper surface of the welding nut 5 without affecting the welding effect of the welding nut 5. Furthermore, during the positioning of the welding nut 5, the inner walls on both sides of the guide groove 14 have different lengths. This allows the guide groove 14 to guide the side edge of the welding nut 5 first when the adjacent side edges of the welding nut 5 are simultaneously positioned on the inner walls of the guide groove 14, ensuring that only one side edge of the welding nut 5 exists inside the guide groove 14 (e.g., ...). Figure 10 As shown, a is a schematic diagram when the lengths of the two side walls of the guide groove 14 are unequal, and b is a schematic diagram when the lengths of the two side walls of the guide groove 14 are the same; combined with Figure 6 The V-shaped opening of the guide groove 14 faces away from the upper electrode 2. Therefore, when the guide groove 14 moves closer to the welding nut 5, the longer side of the guide groove 14 will guide the side edge of the welding nut 5 first. That is, as shown in a, there is a guiding force F1 on one side of the welding nut 5, and the welding nut 5 can rotate under the action of the guiding force F1. As shown in b, there is a guiding force F2 on both sides of the welding nut 5, which causes the welding nut 5 to be restricted in the guide groove 14 and the position of the welding nut 5 cannot be adjusted. This avoids the situation where the two sides of the guide groove 14 have the same length, and the two side edges of the welding nut 5 are simultaneously located on the inner walls of both sides of the guide groove 14. As a result, when the guide groove 14 moves down, it acts on the two side edges of the welding nut 5 at the same time, and the welding nut 5 cannot be guided and positioned.

[0025] During the positioning of the welding nut 5, the welding plate 4 cannot remain horizontal, which affects the positioning of the welding nut 5. As a further solution of the present invention, a C-shaped flattening block 16 is elastically slidably connected to the surface of the upper electrode 2 through a fixing ring 15. The positioning block 11 is located inside the flattening block 16, and the flattening block 16 is used to press down the welding plate 4. During the positioning of the welding nut 5, the upper electrode 2 drives the positioning block 11 and the flattening block 16 to move downwards simultaneously. The bottom of the flattening block 16 first contacts the surface of the welding plate 4. As the upper electrode 2 continues to move downwards, the spring between the flattening block 16 and the fixing ring 15 is compressed, and the downward pressure of the flattening block 16 on the welding plate 4 gradually increases, which can flatten the surface of the welding plate 4 corresponding to the welding position, so that the welding position on the surface of the welding plate 4 can remain flat when the welding nut 5 is positioned and welded, ensuring the accurate positioning of the welding nut 5.

[0026] After the flattening block 16 presses down the welding plate 4, when welding the welding nut 5, the flattening block 16 and the welding plate 4 remain in contact. When energized, the current passing through the flattening block 16 and the welding plate 4 will generate additional heat, causing the flattening block 16 and the welding plate 4 to connect. As a further embodiment of the present invention, a jacking block 17 with a sloping bottom is fixedly connected to the inner side of the flattening block 16. When the flattening block 16 presses down the welding plate 4, the jacking block 17 is located on one side of the positioning block 11. The positioning block 11 can push the flattening block 16 upward through the jacking block 17. After the flattening block 16 presses down the welding plate 4 and the positioning block 11 completes the positioning of the welding nut 5, when the detection disc 7 moves to the position of the welding nut 5, the detection disc 7 moves towards the position of the upper electrode 2 while being blocked by the welding nut 5. The detection disc 7 moves the positioning block 11 away from the welding nut 5 by squeezing the pushing block 12. The movement of the positioning block 11 can cause the flattening block 16 to move upward a certain distance by squeezing the inclined surface at the bottom of the pushing block 17, so that the flattening block 16 can be separated from the welding plate 4 after the welding nut 5 is positioned and pressed down. This avoids the current passing through the pressing part and the welding plate 4 during welding, which would cause heat to be generated between the pressing part and the welding plate 4, causing current diversion at the welding point of the welding nut 5, reducing the amount of current passing through the welding nut 5, and thus affecting the welding effect of the welding nut 5.

[0027] During the pressing of the welding plate 4, there is no support at the bottom of the welding plate 4 corresponding to the pressing position. As a further solution of the present invention, a support plate 18 is provided on the surface of the lower electrode 3. During the pressing process of the welding plate 4, the support plate 18 can support the pressing position of the welding plate 4 corresponding to the flattening block 16, ensuring that the welding plate 4 can be horizontal when pressed down, and preventing the welding plate 4 from being excessively pressed down and bending downward.

[0028] When welding nut 5 and welding plate 4 are electrically welded, support plate 18 contacts welding plate 4. Current passing through support plate 18 and welding plate 4 will shunt the current between welding nut 5 and welding plate 4. As a further embodiment of the present invention, support plate 18 is elastically slidable on the surface of lower electrode 3. Insulating fixing plate 19 is fixedly connected to the surface of support plate 18. Retractable extension rod 21 is slidably connected to the surface of fixing plate 19 through inclined groove 20. Extension rod 21 extends to the surface of positioning block 11 and is slidably connected to the surface of positioning block 11. When positioning block 11 moves away from upper electrode 2, it can drive extension rod 21 to move in inclined groove 20. When the welding nut 5 is pressed down and fixed, the positioning block 11 moves away from the welding nut 5, which can drive the extension rod 21 to move synchronously. The bottom of the extension rod 21 moves in the inclined groove 20, and through the action of the inclined groove 20, the fixing plate 19 and the support plate 18 move downward and separate from the welding plate 4, thereby preventing the support plate 18 from contacting the welding plate 4 when energized, which would affect the welding effect of the welding nut 5 and the welding plate 4.

[0029] When the welding nut 5 is pressed down and fixed, the upper end of the support plate 18 will exceed the upper end of the lower electrode 3. As a further embodiment of the present invention, a limiting ring 22 for limiting the support plate 18 is fixedly connected to the surface of the lower electrode 3. When the welding nut 5 is pressed down and fixed, the support plate 18 is limited by the limiting ring 22 and kept aligned with the upper end of the lower electrode 3 to prevent the welding plate 4 from being pushed upward by the support plate 18 and affecting the normal positioning of the welding nut 5.

Claims

1. A resistance welding apparatus for manufacturing hexagonal weld nuts for automobiles, comprising a base (1), an upper electrode (2), and a lower electrode (3); characterized in that: A welding plate (4) is placed on the surface of the lower electrode (3), and a welding nut (5) is placed on the surface of the welding plate (4). A positioning mechanism is provided on the surface of the upper electrode (2). The positioning mechanism is used to guide and position the welding nut (5) so that the welding nut (5) can be accurately aligned with the upper electrode (2) before it is pressed down. A detection mechanism is provided at the bottom of the upper electrode (2). The detection mechanism includes multiple detection contacts (9). The detection mechanism is used to detect the horizontal state of the upper end of the welding nut (5) through the multiple detection contacts (9) when the upper electrode (2) presses down on the welding nut (5).

2. The resistance welding device for manufacturing hexagonal weld nuts for automobiles according to claim 1, characterized in that: The positioning mechanism includes multiple arc-shaped positioning blocks (11) arranged at equal angles on the surface of the upper electrode (2), and the bottom of the positioning block (11) is a slope.

3. The resistance welding device for manufacturing hexagonal weld nuts for automobiles according to claim 2, characterized in that: The surface of the upper electrode (2) is elastically slidably connected to a C-shaped flattening block (16) via a fixing ring (15). The positioning block (11) is located inside the flattening block (16), and the flattening block (16) is used to press down the welding plate (4).

4. The resistance welding device for manufacturing hexagonal weld nuts for automobiles according to claim 3, characterized in that: The detection mechanism includes a sliding rod (6) that is elastically slidably connected to the bottom of the upper electrode (2) by a spring. A detection disk (7) made of conductive material is hinged to the bottom of the sliding rod (6). The bottom of the upper electrode (2) is provided with a plurality of detection holes (8) arranged at equal angles. A plurality of detection contacts (9) are respectively installed in the plurality of detection holes (8). A pressure block (10) extending from the bottom to the space between the upper electrode (2) and the detection disk (7) is elastically slidably connected in the detection hole (8). When the detection disk (7) is in a horizontal state and moves upward, it can squeeze the plurality of detection contacts (9) through the plurality of pressure blocks (10). When the plurality of detection contacts (9) are squeezed at the same time, the upper electrode (2) can be energized.

5. The resistance welding apparatus for manufacturing hexagonal weld nuts for automobiles according to claim 2, characterized in that: The positioning block (11) slides radially elastically on the surface of the upper electrode (2). A push block (12) with a sloping bottom is fixedly connected to the side of the positioning block (11) near the upper electrode (2). The push block (12) is located between the upper electrode (2) and the detection disk (7). When the detection disk (7) moves upward, it can push the positioning block (11) to move away from the upper electrode (2) through the push block (12).

6. The resistance welding apparatus for manufacturing hexagonal weld nuts for automobiles according to claim 4, characterized in that: The positioning block (11) has a guide block (13) fixedly connected to the surface of the side near the upper electrode (2). The guide block (13) has a V-shaped guide groove (14) on its surface. The guide groove (14) is used to guide and adjust the position of the welding nut (5) through the side edge of the welding nut (5). The detection disk (7) is the same hexagon as the welding nut (5). The guide block (13) has different side lengths on both sides of the guide groove (14). The inner wall lengths on both sides of the guide groove (14) are also different.

7. The resistance welding apparatus for manufacturing hexagonal weld nuts for automobiles according to claim 3, characterized in that: The flattening block (16) is fixedly connected to a jacking block (17) with a sloping bottom. When the flattening block (16) presses down on the welding plate (4), the jacking block (17) is located on one side of the positioning block (11). The positioning block (11) can push the flattening block (16) upward through the jacking block (17).

8. The resistance welding apparatus for manufacturing hexagonal weld nuts for automobiles according to claim 7, characterized in that: A support disk (18) is provided on the surface of the lower electrode (3).

9. The resistance welding apparatus for manufacturing hexagonal weld nuts for automobiles according to claim 8, characterized in that: The support plate (18) slides elastically on the surface of the lower electrode (3). An insulating plate (19) is fixedly connected to the surface of the support plate (18). A retractable extension rod (21) is slidably connected to the surface of the fixed plate (19) through a groove (20). The extension rod (21) extends to the surface of the positioning block (11) and slides to the surface of the positioning block (11). When the positioning block (11) moves away from the upper electrode (2), it can drive the extension rod (21) to move in the groove (20).

10. The resistance welding apparatus for manufacturing hexagonal weld nuts for automobiles according to claim 8, characterized in that: The lower electrode (3) is fixedly connected to a limiting ring (22) for limiting the support plate (18).

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