Positioning device for nut assembly welding

Abstract

The utility model discloses a positioning device for welding a nut assembly. The positioning device comprises a pin seat and a pin shaft, an internal thread is formed on the wall surface, provided with the positioning hole, of the pin seat, and a first step surface is formed on the pin seat; the pin shaft comprises a first shaft part and a second shaft part, external threads are formed on the outer wall face of the second shaft part, and a second step face is formed on the first shaft part. When the positioning device is installed between the nut assembly and the target structural part, the second shaft part sequentially penetrates through the connecting hole of the target structural part and the threaded hole of the nut assembly and is in threaded connection with the positioning hole of the pin seat, and the part, where the small-diameter face of the first step face is located, of the pin seat is clamped in the positioning hole of the nut assembly. And the part of the small-diameter surface of the second stepped surface in the first shaft part of the pin shaft is clamped in the connecting hole of the target structural member. According to the positioning device for nut assembly welding, through the arrangement of the first step face and the second step face, the problem that a movable nut cannot achieve accurate positioning of the position between vehicle body structures is solved.

Description

Technical Field

[0001] The utility model relates to the field of welding fixtures, in particular to a positioning device for welding a nut assembly. Background Art

[0002] Nuts are parts that are screwed together with bolts or screws for fastening. They are widely used in mechanical manufacturing and production. In the specific assembly process of nuts, nuts are often fastened to position metal plates, etc. As an adjustable part, movable nuts can accurately position the nut plate welding process.

[0003] In the prior art, the movable nut needs to be positioned during the process of welding with the metal plate. Since the through hole diameter of the metal plate is 3mm larger than the threaded hole diameter of the movable nut of the square nut box, the center of the through hole of the metal plate and the threaded hole of the movable nut will deviate by 2.5mm. During assembly, the adjustment margin on the other side will become 0mm, that is, the adjustment margin of the movable nut will be consumed, and the movable nut cannot be accurately positioned with the metal plate.

[0004] For example, a patent document with publication number CN212225737U in the prior art discloses a welded nut box set, which includes a machined nut and a welded nut box. The machined nut is slidably arranged in the welded nut box. Although the machined nut is set to be adjustable in this scheme, the machined nut can only control its own position accuracy relative to the welded nut box, and cannot control the position accuracy of the nut itself relative to the target structure to be welded (such as a metal sheet).

[0005] Therefore, due to the limitations of the positioning method and the installation method, the movable nut in the prior art cannot achieve the problem of accurate positioning between the vehicle body structures. Utility Model Content

[0006] The utility model aims to solve the problem that the movable nut in the prior art cannot realize accurate positioning between vehicle body structures due to the limitations of the positioning method and the installation method.

[0007] In order to solve the above problems, an embodiment of the utility model provides a positioning device for welding a nut assembly, which is used to position the nut assembly when it is welded to a target structural part; the positioning device includes: a pin seat, the pin seat is provided with a positioning hole, the positioning hole extends inward from the end surface of the first end of the pin seat, the wall surface of the positioning hole is formed with an internal thread, and the outer wall surface of the first end of the pin seat is formed with a first step surface.

[0008] The pin shaft includes a first shaft portion and a second shaft portion connected along its extension direction, the first shaft portion protrudes from the outer wall surface of the second shaft portion in the radial direction of the second shaft portion, the outer wall surface of the second shaft portion is formed with an external thread, and the outer wall surface of the first shaft portion near one end of the second shaft portion is formed with a second step surface.

[0009] When the positioning device is installed between the nut assembly and the target structural member, the pin seat, the nut assembly, the target structural member and the pin shaft are arranged in sequence in the thickness direction of the nut assembly, and the portion where the small diameter surface of the first step surface in the pin seat is located is snap-fitted to the positioning hole of the nut assembly, the portion where the small diameter surface of the second step surface in the first shaft portion of the pin shaft is located is snap-fitted to the connecting hole of the target structural member, the second shaft portion passes through the threaded hole of the nut assembly and is threadedly connected to the positioning hole of the pin seat, so as to limit the relative movement between the nut assembly and the target structural member in a plane perpendicular to the thickness direction of the nut assembly through the positioning device.

[0010] The above technical solution is adopted, and the positioning device is provided with a pin seat and a pin shaft. The second shaft portion of the pin shaft passes through the connection hole and the threaded hole of the nut assembly in sequence and is threadedly connected with the pin seat, so that the nut assembly is fixed relative to the target structural part. A first step surface is provided on the outer wall surface of the end of the pin seat, and a second step surface is provided on the outer wall surface of one end of the first shaft portion of the pin shaft. The small diameter surface of the first step surface is matched with the inner wall surface of the positioning hole of the nut assembly to control the relative position of the pin seat and the nut assembly; the small diameter surface of the second step surface is also matched with the inner wall surface of the connection hole of the target structural part to control the relative position of the pin shaft and the target structural part.

[0011] When the nut assembly is welded to the target structure, the second shaft portion of the pin passes through the target structure and the nut assembly, and is threadedly connected to the positioning hole of the pin seat, that is, the positional relationship of the nut assembly relative to the target structure is determined through the threaded positioning connection between the pin and the pin seat. The positional accuracy between the nut box and the nut of the nut assembly and between the nut assembly and the target structure can be determined by fine-tuning before welding, so as to prevent the position of the nut assembly from shifting when it is welded to the target structure, thereby improving the welding accuracy.

[0012] Therefore, the positioning device for welding the nut assembly can ensure the positional relationship of the nut relative to the target structural part during the welding process, thereby achieving precise positioning of the nut during the assembly process.

[0013] According to the positioning device for welding a nut assembly provided in an embodiment of the utility model, the pin shaft further includes a handle, and the handle is arranged at an end of the first shaft portion away from the second shaft portion.

[0014] By adopting the above technical solution, a handle is arranged on the pin shaft, and the pin shaft can be screwed into or out of the positioning hole of the pin seat by adjusting the handle. When in use, the operator twists the handle, thereby driving the rotation of the pin shaft, and finally realizing the threaded fit between the pin shaft and the pin seat; the handle is arranged at an end of the first shaft portion away from the second shaft portion, that is, there is a distance between the handle and the target structural part, so that the operator has enough operating space to twist the handle.

[0015] According to the positioning device for welding a nut assembly provided in an embodiment of the utility model, the nut assembly includes a nut and a nut box sleeved on the outside of the nut, and the positioning hole of the nut assembly is coaxially arranged with the threaded hole, and are respectively located in the nut box and the nut; wherein, one end face of the nut is in contact with the side wall surface of the target structural part facing the nut.

[0016] By adopting the above technical solution, the positioning hole of the nut assembly is coaxially arranged with the threaded hole. When the second shaft portion of the pin passes through the nut assembly, it is convenient for the second shaft portion to pass through the positioning hole and the threaded hole of the nut assembly, thereby realizing accurate positioning of the second shaft portion of the pin and the nut assembly during assembly. When the nut assembly is welded to the target structural part, the nut box is sleeved on the outside of the nut, which can protect the nut, and the overall nut assembly is easy to weld, and the nut box can fix the nut.

[0017] According to the positioning device for welding a nut assembly provided in an embodiment of the utility model, each of the first step surface and the second step surface includes a first outer wall surface, a transition surface and a second outer wall surface connected in sequence; in the first step surface, the first outer wall surface extends from one end of the transition surface to the end surface of the first end portion of the pin seat, and the first outer wall surface is located on the inner side of the second outer wall surface in the radial direction of the pin seat, and constitutes a small diameter surface of the first step surface; in the second step surface, the first outer wall surface extends from one end of the transition surface to the end surface of one end of the first shaft portion close to the second shaft portion, and the first outer wall surface is located on the inner side of the second outer wall surface in the radial direction of the first shaft portion, and constitutes a small diameter surface of the second step surface.

[0018] By adopting the above technical solution, a first outer wall surface, a transition surface and a second outer wall surface connected in sequence are provided through a first stepped surface. During specific positioning and installation, there is a gap between the first outer wall surface of the first stepped surface and the inner wall of the threaded hole of the nut assembly, that is, the small diameter surface of the first stepped surface can be adjusted in the nut hole, and the positioning device can further improve the position accuracy of the pin seat relative to the nut assembly.

[0019] The second step surface is provided with a first outer wall surface, a transition surface and a second outer wall surface which are connected in sequence. During specific positioning and installation, there is a gap between the first outer wall surface of the second step surface and the inner wall surface of the connecting hole of the target structural component, that is, the small diameter surface of the second step surface can be adjusted in the connecting hole of the target structural component, thereby further improving the position accuracy of the pin shaft relative to the target structural component.

[0020] According to the positioning device for welding a nut assembly provided in an embodiment of the utility model, the transition surface of the first step surface is used to fit the surface of the nut assembly, and the transition surface of the second step surface is used to fit the side wall surface of the target structural part away from the nut assembly.

[0021] With the above technical solution, the transition surface of the first step surface fits with the surface of the nut assembly facing the pin seat, controlling the position of the pin seat relative to the nut assembly in the axial direction of the pin seat. The transition surface of the second step surface fits with the side wall surface of the target structural part away from the nut assembly, achieving the fit between the pin shaft and the target structural part along the axial direction of the pin shaft, thereby achieving the positioning of the nut assembly in its thickness direction.

[0022] According to the positioning device for welding a nut assembly provided by the embodiment of the utility model, the transition surface of the first step surface is set as: a plane perpendicular to the axis of the pin seat; the transition surface of the second step surface is set as: a plane perpendicular to the axis of the first shaft portion.

[0023] By adopting the above technical solution, when the positioning device is installed between the nut assembly and the target structural part, the end face of the nut assembly facing the pin seat is a plane perpendicular to the axis of the pin seat. When the transition surface of the first step surface is set as a plane perpendicular to the axis of the pin seat, the end face of the nut assembly facing the pin seat can fit with the transition surface of the first step surface, which can further improve the positioning accuracy of the nut assembly and the pin seat. Similarly, when the transition surface of the second step surface is set as a plane perpendicular to the axis of the first shaft portion, the end face of the target structural part facing the pin shaft is perpendicular to the axis of the first shaft portion, and the transition surface of the second step surface can fit with the end face of the target structural part facing the pin shaft, which can further improve the position accuracy of the pin shaft relative to the target structural part.

[0024] According to the positioning device for welding a nut assembly provided in an embodiment of the utility model, a portion of the small-diameter surface of the first step surface in the pin seat is clearance-matched with the positioning hole of the nut assembly, and a portion of the small-diameter surface of the second step surface in the first shaft portion of the pin shaft is clearance-matched with the connecting hole of the target structural member.

[0025] By adopting the above technical solution, the part where the small diameter surface of the first step surface in the pin seat is located is clearance-matched with the positioning hole of the nut assembly, that is, the inner diameter size of the small diameter surface is smaller than the aperture of the positioning hole of the nut assembly. In this setting mode, the small diameter surface of the first step surface can be adjusted relative to the positioning hole of the nut assembly, and the relative accuracy of the first step surface and the positioning hole of the nut assembly can be controlled, thereby effectively ensuring the adjustment margin during the assembly process of the pin seat and the nut assembly.

[0026] The part where the minor diameter surface of the second step surface in the first shaft portion of the pin is located is clearance-matched with the connecting hole of the target structural component, that is, the inner diameter of the minor diameter surface of the second step surface is smaller than the aperture of the connecting hole of the target structural component. With this arrangement, the part where the minor diameter surface of the second step surface is located can be adjusted relative to the connecting hole of the target structural component, and the relative accuracy of the second step surface and the connecting hole of the target structural component can be controlled, thereby effectively ensuring the adjustment margin during the assembly process of the pin and the target structural component.

[0027] According to the positioning device for welding a nut assembly provided in an embodiment of the utility model, the target structural part is set to sheet metal, and the height of the first outer wall surface of the first step surface in the axial direction of the pin seat is greater than the thickness of the threaded hole of the nut assembly.

[0028] By adopting the above technical solution, the target structural part is set as a sheet metal, which is convenient for improving the strength of the target structural part, and also convenient for the nut assembly to be connected to the target structural part by welding. The height of the first outer wall surface of the first step surface in the axial direction of the pin seat is greater than the thickness of the threaded hole of the nut assembly, which can effectively prevent the rotation and movement of the nut box.

[0029] According to the positioning device for welding a nut assembly provided in the embodiment of the utility model, the nut assembly is welded to the sheet metal through welding spots.

[0030] By adopting the above technical solution, the nut assembly and the sheet metal are welded by welding spots, and the welding connection method is more stable, which can prevent the displacement and loosening of the positioned nut assembly and the target structural part due to loose connection.

[0031] According to the positioning device for welding a nut assembly provided in the embodiment of the utility model, the pin seat is arranged as an integrated structure, and the pin shaft is arranged as an integrated structure.

[0032] By adopting the above technical solution, the pin seat and the pin shaft are set as an integrated structure, so that when the pin seat and the pin shaft are installed between the nut assembly and the target structural part, it is only necessary to ensure the position accuracy of the pin seat and the pin shaft relative to the nut assembly and the target structural part to position the nut assembly for welding, and the process is more convenient and efficient.

[0033] The beneficial effects of the utility model are:

[0034] The utility model provides a positioning device for welding a nut assembly, the positioning device comprises a pin seat and a pin shaft, the nut assembly and a target structural part are arranged in sequence between the pin seat and the pin shaft, wherein the pin shaft further comprises a first shaft portion and a second shaft portion, when the positioning device positions the nut assembly and the target structural part, the second shaft portion of the pin shaft passes through a connecting hole of the target structure and a threaded hole of the nut assembly, and is finally threadedly connected with the positioning hole of the pin seat; a first outer wall surface, i.e., a small-diameter surface, is arranged on the pin seat, and a clearance fit is formed between the small-diameter surface and the threaded hole of the nut assembly, and a clearance fit is also formed between the first outer wall surface arranged on the pin shaft and the connecting hole of the target structural part.

[0035] During the welding process of the nut assembly, the positioning accuracy of the nut assembly relative to the target structural part is improved by a positioning device, and the positioned nut assembly is welded to the target structural part. In the prior art, the common hexagonal nut assembly is composed of a hexagonal nut and a nut reinforcement plate connected together by a projection welding process. During the spot welding process of the hexagonal nut assembly and the mounting bracket plate, a threaded tightening pin is often used for positioning. Since the tightening pin is directly connected to the hexagonal nut assembly, more accurate positioning welding is achieved. However, when the nut is a square movable nut, the nut box and the nut box will move. In the actual positioning and installation process, there is a problem that the movable nut cannot achieve accurate positioning of the target structural part due to the large movement margin.

[0036] The positioning device for welding of nut assembly provided by the utility model is provided with a pin seat and a pin shaft on both sides of the nut assembly and the target structural part. A first outer wall surface is formed on the pin seat, and a second outer wall surface is formed on the pin shaft. The margin between the first outer wall surface and the inner wall surface of the threaded hole of the nut assembly is controlled, and the margin between the second outer wall surface and the inner wall surface of the connecting hole of the target structural part is controlled, so that the pin seat and the pin shaft can position the position of the nut assembly relative to the target structural part, which can prevent the position of the nut assembly from being offset when it is welded to the target structural part, control the position accuracy of the pin shaft relative to the target structural part, and thus improve the welding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 An exploded schematic diagram of a positioning device for welding a nut assembly provided in an embodiment of the utility model;

[0038] Figure 2 An exploded schematic diagram of a pin seat and a pin shaft of a positioning device for welding a nut assembly provided in an embodiment of the utility model;

[0039] Figure 3 A schematic diagram of the overall assembly of a positioning device for welding a nut assembly provided in an embodiment of the utility model;

[0040] Figure 4 A front view structural schematic diagram of a positioning device for welding a nut assembly provided in an embodiment of the utility model;

[0041] Figure 5 The present invention is a schematic diagram of the overall cross-sectional structure of a positioning device for welding a nut assembly provided in an embodiment of the present invention.

[0042] Description of the accompanying drawings of the present utility model:

[0043] 1. Positioning device;

[0044] 10. Pin seat;

[0045] 100. Positioning hole;

[0046] 101, first step surface;

[0047] 102. a first outer wall surface of the pin seat; 103. a transition surface of the pin seat;

[0048] 104. a second outer wall surface of the pin seat; 105. a minor diameter surface of the pin seat;

[0049] 11. Pin;

[0050] 110, first shaft portion; 120, second shaft portion;

[0051] 130, second step surface;

[0052] 131. a first outer wall surface of the pin shaft; 132. a transition surface of the pin shaft;

[0053] 133. A second outer wall surface of the pin shaft; 134. A minor diameter surface of the pin shaft;

[0054] 140. Handle;

[0055] 2. Nut assembly;

[0056] 20. Nut; 21. Nut box; 22. Threaded hole of nut assembly; 23. Welding point;

[0057] 3. Target structural parts;

[0058] 30. Connection holes of target structural parts. DETAILED DESCRIPTION

[0059] The nut assembly ensures the accurate assembly of the nut assembly and the target structural part by controlling the relative position accuracy between the nut assembly and the target structural part. However, due to the limitations of the positioning method and installation method, the movable nut in the prior art cannot achieve the problem of accurate positioning between the vehicle body structures.

[0060] The utility model provides a positioning device for welding a nut assembly, which can improve the positioning accuracy of welding the nut to a target structural part.

[0061] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0062] See also Figures 1 to 3 This positioning device 1 is used to position the nut assembly 2 when it is welded to the target structural part 3; the positioning device 1 includes a pin seat 10 and a pin shaft 11, the pin seat 10 is provided with a positioning hole 100, the positioning hole 100 extends inward from the end surface of the first end of the pin seat 10, the wall surface of the positioning hole 100 is formed with an internal thread, and the outer wall surface of the first end of the pin seat 10 is formed with a first step surface 101.

[0063] The pin shaft 11 includes a first shaft portion 110 and a second shaft portion 120 connected along its extension direction, the first shaft portion 110 protrudes from the outer wall surface of the second shaft portion 120 in the radial direction of the second shaft portion 120, the outer wall surface of the second shaft portion 120 is formed with an external thread, and the outer wall surface of the first shaft portion 110 near one end of the second shaft portion 120 is formed with a second step surface 130.

[0064] When the positioning device 1 is installed between the nut assembly 2 and the target structural member 3, the pin seat 10, the nut assembly 2, the target structural member 3 and the pin shaft 11 are arranged in sequence in the thickness direction of the nut assembly 2, and the portion where the small diameter surface 105 of the pin seat of the first step surface 101 in the pin seat 10 is located is snap-fitted into the positioning hole of the nut assembly 2, the portion where the small diameter surface 134 of the pin shaft of the second step surface 130 in the first shaft portion 110 of the pin shaft 11 is located is snap-fitted into the connecting hole 30 of the target structural member, the second shaft portion 120 passes through the threaded hole 22 of the nut assembly and is threadedly connected to the positioning hole 100 of the pin seat 10, so as to limit the relative movement between the nut assembly 2 and the target structural member 3 in a plane perpendicular to the thickness direction of the nut assembly 2 through the positioning device 1.

[0065] Specifically, the depth of the positioning hole 100 provided on the pin seat 10 of the positioning device 1 is smaller than the thickness of the pin seat 10, and the positioning hole 100 of the pin seat 10 is threadedly connected with the second shaft portion 120 of the pin shaft 11. For example, if the thickness of the pin seat 10 is 8 cm, the depth of the positioning hole 100 of the pin seat 10 can be set to 6 cm, 5 cm, or 4 cm. The depth of the positioning hole 100 of the pin seat 10 only needs to ensure that the pin seat 10 and the pin shaft 11 are firmly threaded together, and the specific depth of the positioning hole 100 of the pin seat 10 is not limited in this embodiment.

[0066] More specifically, the second shaft portion 120 of the pin 11 is to be threadedly connected with the positioning hole 100 of the pin seat 10, and the first shaft portion 110 of the pin 11 is to be compatible with the connecting hole 30 of the target structural part, as long as the first outer wall surface of the first shaft portion 110 of the pin 11 is 0 to 0.5 mm away from the inner wall surface of the connecting hole 30 of the target structural part. Exemplarily, the inner diameter of the first shaft portion 110 of the pin 11 is 3 cm, and the aperture of the connecting hole 30 of the target structural part is 3.5 cm. The specific inner diameter size of the first shaft portion 110 and the aperture size of the connecting hole 30 of the target structural part can meet the actual assembly accuracy, and this embodiment does not limit this. The inner diameter size of the second shaft portion 120 of the pin 11 can be firmly threaded with the positioning hole 100 of the pin seat 10, and this embodiment does not limit this.

[0067] Continue to refer Figure 2 In order to solve the problem that the movable nut cannot achieve accurate positioning between the vehicle body structures, the positioning device for welding the nut assembly provided in this embodiment includes a first step surface 101 and a second step surface 130.

[0068] Specifically, the portion where the small diameter surface 105 of the pin seat is located is clamped in the positioning hole of the nut assembly 2, and the small diameter surface 105 of the pin seat and the positioning hole of the nut assembly 2 can be assembled together. In the actual assembly process, the small diameter surface 105 of the pin seat can be provided with an adjustment margin relative to the positioning hole of the nut assembly 2. By adjusting the margin between the small diameter surface 105 of the pin seat and the positioning hole of the nut assembly 2, the position of the pin seat 10 and the nut assembly 2 is prevented from being offset during welding, thereby ensuring the relative position accuracy of the pin seat 10 relative to the nut assembly 2.

[0069] More specifically, the portion where the small-diameter surface 134 of the pin is located is snap-fitted to the connecting hole 30 of the target structural member, the pin 11 is arranged on one side of the target structural member 3, and the first shaft portion 110 and the second shaft portion 120 of the pin 11 can pass through the connecting hole 30 of the target structural member. In the actual assembly process, the small-diameter surface 134 of the pin is also provided with an adjustment margin relative to the connecting hole 30 of the target structural member, which can ensure that the positions of the pin 11 and the target structural member 3 are offset during the positioning process, thereby achieving control of the position accuracy of the pin 11 relative to the target structural member 3; in the present embodiment, the nut assembly 2 is connected to the target structural member 3 by welding, thereby ensuring the relative position accuracy of the pin seat 10 relative to the nut assembly 2 and ensuring the position accuracy of the pin 11 relative to the target structural member 3.

[0070] See also Figure 2 In this embodiment, the pin shaft 11 further includes a handle 140 , and the handle 140 is disposed at an end of the first shaft portion 110 away from the second shaft portion 120 .

[0071] In the actual assembly process of the positioning device, when the second shaft portion 120 of the pin shaft 11 passes through the target structural member 3 and the nut assembly 2 in sequence and then is threadedly connected with the positioning hole 100 of the pin seat 10, a driving force is required to achieve the above positioning effect. In this embodiment, the driving force is entirely from the handle 140, that is, the operator turns the handle 140 to facilitate the threaded connection or loosening of the pin shaft 11 and the pin seat 10.

[0072] See also Figure 1 as well as Figure 3 In this embodiment, the nut assembly 2 includes a nut 20 and a nut box 21 sleeved on the outside of the nut 20. The positioning hole of the nut assembly 2 is coaxially arranged with the threaded hole 22, and are respectively located in the nut box 21 and the nut 20; wherein, one end face of the nut 20 is in contact with the side wall surface of the target structural component 3 facing the nut 20.

[0073] Specifically, the nut assembly 2 is arranged between the pin seat 10 and the target structural member 3, and the positioning hole of the nut assembly 2 is coaxially arranged with the threaded hole 22, that is, the positioning hole of the nut assembly 2 and the threaded hole 22 are through holes, and the second shaft portion 120 of the pin shaft 11 can pass through the through hole between the two, so as to achieve the positioning effect through the threaded connection between the pin shaft 11 and the pin seat 10. The nut box 21 of the nut assembly 2 can protect the nut 20, and the nut box can fix the nut, and the overall nut assembly is more convenient for welding.

[0074] More specifically, one side of the nut assembly 2 is the target structural part 3. When the positioning device 1 is positioning, one end face of the nut 20 is fitted with the side wall surface of the target structural part 3 facing the nut 20. Such a fitting arrangement allows the nut assembly 2 to be fully connected to the target structural part 3, reduces the gap between the nut assembly 2 and the target structural part 3, and further improves the positioning accuracy of the nut assembly 2 relative to the target structural part 3 in its thickness direction.

[0075] See also Figure 1 as well as Figure 2In this embodiment, each of the first step surface 101 and the second step surface 130 includes a first outer wall surface, a transition surface, and a second outer wall surface that are connected in sequence; in the first step surface 101, the first outer wall surface 102 of the pin seat extends from one end of the transition surface 103 of the pin seat to the end surface of the first end of the pin seat 10, and the first outer wall surface 102 of the pin seat is located on the inner side of the second outer wall surface 104 of the pin seat in the radial direction of the pin seat 10, and constitutes the small diameter surface 105 of the pin seat of the first step surface 101. In the second step surface 130, the first outer wall surface 131 of the pin shaft extends from one end of the transition surface 132 of the pin shaft to the end surface of one end of the first shaft portion 110 close to the second shaft portion 120, and the first outer wall surface 131 of the pin shaft is located on the inner side of the second outer wall surface 133 of the pin shaft in the radial direction of the first shaft portion 110, and constitutes the small diameter surface 134 of the pin shaft of the second step surface 130.

[0076] Specifically, the first outer wall surface 102 of the pin seat, the transition surface 103 of the pin seat, and the second outer wall surface 104 of the pin seat are all arranged on the pin seat 10, wherein the first outer wall surface 102 of the pin seat is connected to the transition surface 103 of the pin seat, and the normal axis of the first outer wall surface 102 of the pin seat is parallel to the transition surface 103 of the pin seat. Similarly, the second outer wall surface 104 of the pin seat is also connected to the transition surface 103 of the pin seat, and the normal axis of the second outer wall surface 104 of the pin seat is parallel to the transition surface 103 of the pin seat, and the inner diameter formed by the second outer wall surface 104 of the pin seat along the radial direction of the pin seat 10 is larger than the inner diameter formed by the first outer wall surface 102 of the pin seat along the radial direction of the pin seat 10.

[0077] More specifically, the first outer wall surface 131 of the pin, the transition surface 132 of the pin, and the second outer wall surface 133 of the pin are all arranged on the pin 11, wherein the second outer wall surface 133 of the pin is connected to the transition surface 132 of the pin, and the normal axis of the second outer wall surface 133 of the pin is parallel to the transition surface 132 of the pin. Similarly, the first outer wall surface 131 of the pin is also connected to the transition surface 132 of the pin, the normal axis of the first outer wall surface 131 of the pin is parallel to the transition surface 132 of the pin, and the inner diameter formed by the second outer wall surface 133 of the pin along the radial direction of the pin 11 is larger than the inner diameter formed by the first outer wall surface 131 of the pin along the radial direction of the pin 11.

[0078] See also Figure 1 as well as Figure 2In this embodiment, the transition surface 103 of the pin seat is used to fit the surface of the nut assembly 2, and the transition surface 132 of the pin shaft is used to fit the side wall surface of the target structural component 3 away from the nut assembly 2. That is, the transition surface 103 of the pin seat fits with the outer surface of the nut box 21 during the actual positioning process. Such a fitting setting can control the position accuracy of the pin seat 10 relative to the nut assembly 2; one side of the pin shaft 11 is the target structural component 3, and the transition surface 132 of the pin shaft fits the side wall surface of the target structural component 3 away from the nut assembly 2, which can improve the position accuracy of the pin shaft 11 relative to the target structural component 3.

[0079] Continue to see Figure 1 as well as Figure 2 In this embodiment, the transition surface 103 of the pin seat is set as: a plane perpendicular to the axis of the pin seat 10; the transition surface 132 of the pin shaft is set as: a plane perpendicular to the axis of the first shaft portion 110. In the positioning process of the common positioning device 1, the outer side of the nut box 21 of the nut assembly 2 is provided with a positioning hole on one side which is a plane, and the side surface of the common target structural component 3 is also a plane. The transition surface 103 of the pin seat is set as a plane perpendicular to the axis of the pin seat 10, which facilitates the pin seat 10 and the nut box 21 of the nut assembly 2 to fit tightly. The transition surface 132 of the pin shaft is set as a plane perpendicular to the axis of the first shaft portion 110, which also facilitates the transition surface 132 of the pin shaft to fit tightly with the wall of the target structural component 3 away from the nut assembly 2, thereby improving the position accuracy of the pin shaft 11 relative to the target structural component 3 in the axial direction of the pin shaft 11.

[0080] Continue to see Figure 1 as well as Figure 2 In this embodiment, the position where the small diameter surface 105 of the pin seat is located is clearance matched with the positioning hole of the nut assembly 2, and the position where the small diameter surface 134 of the pin shaft is located is clearance matched with the connecting hole 30 of the target structural member.

[0081] Specifically, the inner diameter of the portion where the small diameter surface 105 of the pin seat is located is smaller than the aperture of the positioning hole of the nut assembly 2, that is, there is an adjustment margin between the portion where the small diameter surface 105 of the pin seat is located and the positioning hole of the nut assembly 2. For example, if the inner diameter of the portion where the small diameter surface 105 of the pin seat is located is 3 cm, then the aperture size of the positioning hole of the nut assembly 2 is 3.5 cm. The specific size between the inner diameter of the portion where the small diameter surface 105 of the pin seat is located and the aperture size of the positioning hole of the nut assembly 2 only needs to satisfy a single-sided error of less than 0.5 mm, and the specific size value is not limited in this embodiment.

[0082] More specifically, the inner diameter of the small diameter surface 134 of the pin is smaller than the aperture size of the connecting hole 30 of the target structural part. For example, the inner diameter of the portion where the small diameter surface 134 of the pin is located is set to 4 cm, and the aperture size of the connecting hole 30 of the target structural part is 4.5 cm. The inner diameter of the portion where the small diameter surface 134 of the pin is located and the aperture size of the connecting hole 30 of the target structural part only need to satisfy a single-side error of less than 0.5 mm, and the specific size values ​​are not limited in this embodiment.

[0083] See also Figure 1 as well as Figure 3 In this embodiment, the target structural member 3 is configured as a sheet metal, and the height of the first outer wall surface 102 of the pin seat in the axial direction of the pin seat 10 is greater than the thickness of the threaded hole 22 of the nut assembly.

[0084] Specifically, the target structural part 3 is made of sheet metal. Since sheet metal has high strength and is commonly used in vehicle structural parts, when the positioning device 1 is positioned by twisting the handle 140 of the pin 11, the sheet metal can withstand the extrusion force from the pin 11 and the nut assembly 2, thereby making the nut assembly 2 and the target structural part 3 fit tightly before welding, thereby improving the welding accuracy. The height of the first outer wall surface 102 of the pin seat in the axial direction of the pin seat 10 is greater than the thickness of the threaded hole 22 of the nut assembly, which can effectively prevent the rotation and movement of the nut box 21. Of course, it should be noted that in this embodiment, the target structural part 3 can also be other weldable materials, as long as the welding fixation of the relative position of the nut assembly 2 and the target structural part 3 is satisfied, and the specific material used for the target structural part 3 is not limited in this embodiment.

[0085] See also Figure 3 , Figure 4 as well as Figure 5 In this embodiment, the nut assembly 2 and the sheet metal are welded by welding points 23. The welding by welding points 23 makes the connection between the nut assembly 2 and the sheet metal more secure, and the misalignment between the nut assembly 2 and the sheet metal will not occur due to loose welding.

[0086] See also Figure 2 In this embodiment, the pin seat 10 is set as an integrated structure, and the pin shaft 11 is set as an integrated structure. The setting of the integrated structure facilitates the threaded connection between the pin seat 10 and the pin shaft 11, realizes the efficient connection between the pin seat 10 and the pin shaft 11, and the integrated structure does not require the combination of other components, which can effectively improve the space utilization rate.

[0087] Specifically, the pin seat 10 is set as an integrated structure, and the pin shaft 11 is set as an integrated structure. In the process of welding the nut assembly 2 to the target structural member 3, the second shaft portion 120 of the pin shaft 11 passes through the connection hole 30 of the target structural member and the threaded hole 22 of the nut assembly in sequence, and then is threadedly connected with the positioning hole 100 of the pin seat 10. In the connection process, the position of the nut assembly 2 relative to the target structural member 3 is finely adjusted to achieve the position accuracy control of the nut assembly 2 and the target structural member 3 by the positioning device 1, and welding is performed after positioning is completed.

[0088] It should be noted that, in addition to the implementation methods of the utility model described in the above-mentioned specific specific embodiments, those skilled in the art can easily understand other advantages and functions of the utility model from the contents disclosed in this specification. Although the description of the utility model is introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation method. On the contrary, the purpose of introducing the utility model in conjunction with the implementation method is to cover other options or modifications that may be extended based on the claims of the utility model. In order to provide an in-depth understanding of the utility model, the above description contains many specific details, and the utility model can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the utility model, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0089] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0090] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0091] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0092] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0093] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A positioning device for welding a nut assembly, used for positioning the nut assembly when welding it to a target structural part; characterized in that: The positioning device comprises: A pin seat, wherein the pin seat is provided with a positioning hole, the positioning hole extends inwardly from the end surface of the first end portion of the pin seat, the wall surface of the positioning hole is formed with an internal thread, and the outer wall surface of the first end portion of the pin seat is formed with a first stepped surface; A pin shaft, the pin shaft comprising a first shaft portion and a second shaft portion connected along an extension direction thereof, the first shaft portion protruding from an outer wall surface of the second shaft portion in a radial direction of the second shaft portion, an outer wall surface of the second shaft portion being formed with an external thread, and an outer wall surface of the first shaft portion close to an end portion of the second shaft portion being formed with a second step surface; When the positioning device is installed between the nut assembly and the target structural member, in the thickness direction of the nut assembly, the pin seat, the nut assembly, the target structural member and the pin shaft are arranged in sequence, and the portion of the small diameter surface of the first step surface in the pin seat is snap-fitted to the positioning hole of the nut assembly, and the portion of the small diameter surface of the second step surface in the first shaft portion of the pin shaft is snap-fitted to the connecting hole of the target structural member, and the second shaft portion passes through the threaded hole of the nut assembly and is threadedly connected to the positioning hole of the pin seat, so as to limit the relative movement between the nut assembly and the target structural member in a plane perpendicular to the thickness direction of the nut assembly through the positioning device.

2. The positioning device for welding a nut assembly according to claim 1, characterized in that: The pin shaft further includes a handle, and the handle is disposed at an end of the first shaft portion away from the second shaft portion.

3. The positioning device for welding a nut assembly according to claim 1, characterized in that: The nut assembly includes a nut and a nut box sleeved on the nut, and the positioning hole of the nut assembly is coaxially arranged with the threaded hole and is respectively located in the nut box and the nut; wherein, One end surface of the nut is in contact with a side wall surface of the target structural component facing the nut.

4. The positioning device for welding a nut assembly according to claim 1, characterized in that: Each of the first step surface and the second step surface comprises a first outer wall surface, a transition surface and a second outer wall surface which are connected in sequence; In the first stepped surface, the first outer wall surface extends away from one end of the transition surface to the end surface of the first end portion of the pin seat, the first outer wall surface is located on the inner side of the second outer wall surface in the radial direction of the pin seat, and constitutes a small diameter surface of the first stepped surface; In the second step surface, the first outer wall surface extends from one end of the transition surface to the end surface of the first shaft portion close to one end of the second shaft portion, and the first outer wall surface is located on the inner side of the second outer wall surface in the radial direction of the first shaft portion, and constitutes a small diameter surface of the second step surface.

5. The positioning device for welding a nut assembly according to claim 4, characterized in that: The transition surface of the first step surface is used to fit on the surface of the nut assembly, and the transition surface of the second step surface is used to fit on the side wall surface of the target structural component away from the nut assembly.

6. The positioning device for welding a nut assembly according to claim 4, characterized in that: The transition surface of the first step surface is set to be: a plane perpendicular to the axis of the pin seat; The transition surface of the second step surface is configured as a plane perpendicular to the axis of the first shaft portion.

7. The positioning device for welding a nut assembly according to claim 1, characterized in that: The portion of the pin seat where the small diameter surface of the first step surface is located has a clearance fit with the positioning hole of the nut assembly, and the portion of the pin shaft where the small diameter surface of the second step surface is located has a clearance fit with the connecting hole of the target structural component.

8. The positioning device for welding a nut assembly according to claim 4, characterized in that: The target structural member is configured as a sheet metal, and a height of the first outer wall surface of the first step surface in the axial direction of the pin seat is greater than a thickness of a threaded hole of the nut assembly.

9. The positioning device for welding a nut assembly according to claim 8, characterized in that: The nut assembly is welded to the sheet metal via spot welds.

10. The positioning device for welding a nut assembly according to any one of claims 1 to 9, characterized in that: The pin seat is configured as an integrated structure, and the pin shaft is configured as an integrated structure.

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