Nut structure and combined workpiece

Abstract

The utility model provides a nut structure and a combined workpiece, and relates to the technical field of nuts, the nut structure comprises a nut body part provided with a threaded hole, a limiting part provided with a first through hole and a tension part provided with a second through hole, the nut body part, the limiting part and the tension part are sequentially connected along the axial direction of the threaded hole, the threaded hole, the first through hole and the second through hole are sequentially communicated and coaxially arranged, the tension part is used for being in abutting fit with the hole wall of a mounting hole of a plate workpiece through expansion deformation, and the limiting part is of a prism structure and is used for being located outside the mounting hole. Thus, the nut structure is fixed to the mounting hole of the plate workpiece in a clamping mode, the nut structure can be fixed to the plate workpiece, and it can be guaranteed that a metal coating on the surface of the plate workpiece is not damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of nuts, in particular to a nut structure and a combined workpiece. Background Art

[0002] At present, the connection between aluminum alloy auto parts and other parts is usually achieved by projection welding steel nuts on them. However, due to the different metal materials of the nuts and auto parts, electrochemical corrosion is likely to occur at the steel-aluminum contact point when welding the nuts, causing the coating on the metal surface to be destroyed. As a result, the auto parts with the nuts welded on are also prone to corrosion, and thus fail to meet the corrosion resistance requirements. Utility Model Content

[0003] The problem solved by the utility model is how to improve the corrosion resistance of automobile parts while ensuring connection.

[0004] In order to solve the above problems, the utility model provides a nut structure and a combined workpiece.

[0005] In the first aspect, the utility model provides a nut structure, comprising a nut body portion provided with a threaded hole, a limiting portion provided with a first through hole and an expanding portion provided with a second through hole, the nut body portion, the limiting portion and the expanding portion are connected in sequence along the axial direction of the threaded hole, the threaded hole, the first through hole and the second through hole are connected in sequence and coaxially arranged, the expanding portion is used to abut and cooperate with the hole wall of the mounting hole of the plate workpiece through expansion and deformation, the limiting portion is a prismatic structure, and is used to be located outside the mounting hole.

[0006] Optionally, the orthographic projection of the limiting portion on a setting plane covers the orthographic projection of the stretching portion on the setting plane, wherein the setting plane is a plane perpendicular to the axis of the threaded hole.

[0007] Optionally, the outer contour of the orthographic projection of the stretching portion on the set plane is an inscribed circle of the outer contour of the orthographic projection of the limiting portion on the set plane.

[0008] Optionally, an outer side wall of the expansion portion is provided with a groove, and the groove is extended along the axial direction of the second through hole and extends from one end to the other end of the expansion portion.

[0009] Optionally, there are multiple grooves, and the multiple grooves are evenly arranged along the circumference of the expansion part.

[0010] Optionally, the nut structure also includes a flange portion, and the nut body portion, the flange portion, the limiting portion and the tensioning portion are connected in sequence along the axial direction of the threaded hole, and the orthographic projection of the limiting portion on the set plane is located within the orthographic projection of the flange portion on the set plane.

[0011] In the second aspect, the utility model provides a combined workpiece, including a plate workpiece, a limiting plate and the nut structure as described above, the limiting plate is provided with a limiting hole, the limiting portion of the nut structure is used to be plugged into and cooperate with the limiting hole, the plate workpiece is provided with a mounting hole, the expanding portion of the nut structure is inserted into the mounting hole, and is used to abut and cooperate with the hole wall of the mounting hole through expansion and deformation.

[0012] Optionally, one end of the stretching portion away from the limiting portion is flush with a side surface of the plate workpiece away from the limiting plate.

[0013] Optionally, the plate workpiece is a profile structure provided with a cavity, the nut structure and the limit plate are arranged in the cavity, and the cavity wall of the cavity is used to limit the rotation of the limit plate relative to the plate workpiece.

[0014] Optionally, the mounting hole includes a cylindrical section and a conical section that are interconnected and coaxially arranged, the conical section is located on the side of the cylindrical section away from the limiting plate, and the aperture of the conical section is arranged to increase from the conical section toward one end of the cylindrical section to the end of the conical section away from the cylindrical section.

[0015] The beneficial effect of the nut structure of the present invention is that: a nut body, a limiting part and a tensioning part can be provided, and coaxially connected threaded holes, a first through hole and a second through hole can be provided on the nut body, the limiting part and the tensioning part respectively. In this way, when in use, the tensioning part of the nut structure can be first inserted into the mounting hole of the plate workpiece, and then the nut body or the limiting part of the nut structure can be fixed with auxiliary tooling such as a wrench to prevent the nut structure from rotating, and then the threaded sections of the tensioning tooling (i.e., the bolt with a threaded section and a conical section) can be passed through the nut structure in sequence. The second through hole and the first through hole of the structure are then screwed into the threaded hole, so that the expansion portion expands and deforms under the extrusion of the conical section of the expansion tool, thereby causing the expansion portion to tightly abut against the hole wall of the mounting hole, thereby fixing the nut structure to the mounting hole of the sheet workpiece by a snap-fit method. This not only fixes the nut structure to the sheet workpiece, but also ensures that the metal plating on the surface of the sheet workpiece is not damaged. Therefore, the nut structure can be embedded in sheet workpieces of different metal materials while ensuring corrosion resistance, so as to facilitate the connection of the sheet workpiece with other structures. At the same time, by setting the limiting portion as a prismatic structure and locating it outside the mounting hole of the sheet workpiece, when the nut structure is applied to a sheet workpiece with a profile structure, it can cooperate with, for example, a limiting plate to limit the nut structure, preventing the nut structure from rotating when fastened with the bolt, thereby ensuring a reliable and firm connection between the sheet workpiece with a profile structure and other structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the nut structure in the embodiment of the utility model;

[0017] Figure 2 This is a schematic cross-sectional view of a nut structure in an embodiment of the present utility model;

[0018] Figure 3 This is a schematic top view of the nut structure in an embodiment of the present utility model;

[0019] Figure 4 This is a structural diagram of the nut structure and the limiting plate when assembled in an embodiment of the present utility model;

[0020] Figure 5 This is a cross-sectional diagram of the assembly of the nut structure and the limiting plate in the embodiment of the present utility model;

[0021] Figure 6 This is a structural diagram of the nut structure, the limiting plate and the plate workpiece when assembled in an embodiment of the present utility model;

[0022] Figure 7 This is a cross-sectional schematic diagram of the assembly of the nut structure, the limiting plate and the plate workpiece in the first embodiment of the present utility model;

[0023] Figure 8 It is a cross-sectional schematic diagram of the assembly of the nut structure, the limiting plate and the plate workpiece in the second embodiment of the present utility model.

[0024] Description of reference numerals:

[0025] 10. Nut structure; 11. Nut body; 111. Threaded hole; 12. Limiting portion; 121. First through hole; 13. Tensioning portion; 131. Second through hole; 132. Groove; 14. Flange; 20. Limiting plate; 21. Limiting hole; 30. Plate workpiece; 31. Mounting hole; 311. Cylindrical section; 312. Conical section; 32. Cavity. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0027] The Z-axis in the accompanying drawings represents the vertical direction, that is, the up-down position, with the positive direction of the Z-axis representing the up direction and the negative direction of the Z-axis representing the down direction. It should also be noted that the aforementioned Z-axis is merely for the purpose of facilitating and simplifying the description of the present invention, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be construed as limiting the present invention.

[0028] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in this utility model are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0029] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0030] Combine Figure 1 、 Figure 2 、 Figure 7 and Figure 8 As shown, a nut structure 10 provided by an embodiment of the utility model includes a nut body 11 provided with a threaded hole 111, a limiting portion 12 provided with a first through hole 121 and an expanding portion 13 provided with a second through hole 131. The nut body 11, the limiting portion 12 and the expanding portion 13 are connected in sequence along the axial direction of the threaded hole 111, the threaded hole 111, the first through hole 121 and the second through hole 131 are connected in sequence and coaxially arranged, the expanding portion 13 is used to abut and cooperate with the hole wall of the mounting hole 31 of the plate workpiece 30 through expansion and deformation, the limiting portion 12 is a prismatic structure, and is used to be located outside the mounting hole 31.

[0031] Specifically, the nut structure 10 in this embodiment mainly includes three parts, namely a nut body part 11, a limiting part 12 and a tensioning part 13 connected in sequence. The nut body part 11 is the part that carries the internal thread, and the tensioning part 13 is used to abut and cooperate with the hole wall of the mounting hole 31 of the nut structure 10 through expansion deformation or tension deformation, so as to fix the nut structure 10 at the mounting hole 31 of the nut structure 10 in a non-welding manner; if the nut structure 10 is applied to a flat plate workpiece 30, the limiting part 12 is used to fix the nut structure 10 on the plate workpiece 30. When the nut structure 10 is fixed on the plate workpiece 30, the limiting portion 12 can be used in conjunction with auxiliary tools such as a wrench to limit the nut structure 10. When the nut structure 10 is applied to a plate workpiece 30 with a profile structure, the limiting portion 12 can be used in conjunction with auxiliary tools such as a wrench to limit the nut structure 10. It can also be used to cooperate with an external structure such as a limiting plate 20 to limit the nut structure 10, so as to prevent the nut structure 10 from rotating relative to the plate workpiece 30 when the plate workpiece 30 with the nut structure 10 is connected to other structures through bolts.

[0032] More specifically, the nut body 11, the limiting portion 12 and the tensioning portion 13 are generally columnar structures, wherein the limiting portion 12 is a prismatic structure, for example, Figure 1 The example of the limiting portion 12 being a hexagonal prism structure is given in the figure. The nut body 11 and the expansion portion 13 can be cylindrical structures or prismatic structures. When the expansion portion 13 is a prismatic structure, since the mounting hole 31 of the plate workpiece 30 is usually compatible with the expansion portion 13, the mounting hole 31 of the plate workpiece 30 is also a prismatic through-hole structure. However, in actual applications, such as Figure 1As shown, it is generally preferred that the nut body 11 has a prismatic structure and the expansion portion 13 has a cylindrical structure. Furthermore, a threaded hole 111 is formed through the nut body 11 along its central axis, a first through-hole 121 is formed through the position-limiting portion 12 along its central axis, and a second through-hole 131 is formed through the expansion portion 13 along its central axis. The threaded hole 111, the first through-hole 121, and the second through-hole 131 are sequentially connected and coaxially arranged. The first through-hole 121 and the second through-hole 131 are typically circular, with their apertures typically larger than the major diameter of the threaded hole 111, to facilitate the rapid passage of a bolt through the second through-hole 131 and the first through-hole 121 to form a threaded connection with the threaded hole 111.

[0033] The nut structure 10 in this embodiment can be provided with a nut body portion 11, a limiting portion 12 and a tensioning portion 13, and a coaxially connected threaded hole 111, a first through hole 121 and a second through hole 131 are respectively provided on the nut body portion 11, the limiting portion 12 and the tensioning portion 13. In this way, when in use, the tensioning portion 13 of the nut structure 10 can be first inserted into the mounting hole 31 of the plate workpiece 30, and then the nut body portion 11 or the limiting portion 12 of the nut structure 10 can be fixed with an auxiliary tool such as a wrench to prevent the nut structure 10 from rotating, and then the threaded sections of the tensioning tool (i.e., the bolt with a threaded section and a conical section) can be passed through the nut structure in sequence. The second through hole 131 and the first through hole 121 of 10 are screwed into the threaded hole 111, so that the expanding part 13 expands and deforms under the extrusion of the conical section of the expanding tool, and then the expanding part 13 is tightly abutted against the hole wall of the mounting hole 31, so that the nut structure 10 is fixed to the mounting hole 31 of the sheet workpiece 30 by a clip-on manner. This not only can fix the nut structure 10 on the sheet workpiece 30, but also can ensure that the metal plating on the surface of the sheet workpiece 30 is not damaged, so that the nut structure 10 can be pre-embedded on the sheet workpiece 30 of different metal materials while ensuring corrosion resistance, so as to facilitate the connection between the sheet workpiece 30 and other structures. At the same time, by setting the limiting portion 12 as a prismatic structure and making it located outside the mounting hole 31 of the plate workpiece 30, when the nut structure 10 is applied to the plate workpiece 30 of the profile structure, it can be cooperated with, for example, a limiting plate 20 to limit the nut structure 10, thereby preventing the nut structure 10 from rotating when it is fastened with the bolt, thereby ensuring that the connection between the plate workpiece 30 of the profile structure and other structures is reliable and firm.

[0034] Optionally, combined Figure 1 As shown, a groove 132 is provided on the outer wall of the pulling portion 13 . The groove 132 is extended along the axial direction of the second through hole 131 and extends from one end to the other end of the pulling portion 13 .

[0035] In this optional embodiment, the groove 132 can be arranged longitudinally, that is, extending along the axial direction of the second through-hole 131, or can be arranged obliquely relative to the axial direction of the second through-hole 131, without specific limitation herein. Thus, by providing the groove 132 on the outer wall of the expansion portion 13, the local thickness of the expansion portion 13 is reduced, facilitating outward expansion of the expansion portion 13. Furthermore, the outward expansion of the expansion portion 13 increases the contact area between the expansion portion 13 and the wall of the mounting hole 31, thereby increasing the contact area between the expansion portion 13 and the sheet workpiece 30, thereby further stabilizing the connection between the nut structure 10 and the sheet workpiece 30. Furthermore, extending the groove 132 along the axial direction of the second through-hole 131 facilitates machining of the groove 132, thereby improving the production efficiency of the nut structure 10. Furthermore, extending the groove 132 from one end of the expansion portion 13 to the other ensures that the thickness of the expansion portion 13 is evenly distributed along the central axis of the expansion portion 13, allowing the expansion portion 13 to better adapt to sheet workpieces 30 of varying thicknesses.

[0036] Optionally, combined Figure 1 As shown, multiple grooves 132 are provided, and the grooves 132 are evenly distributed along the circumference of the expansion portion 13. This not only further reduces the local thickness of the expansion portion 13, but also makes the thickness of the expansion portion 13 evenly distributed, facilitating rapid expansion of the expansion portion 13. Furthermore, the contact area between the expansion portion 13 and the plate workpiece 30 is further increased, making the connection between the nut structure 10 and the plate workpiece 30 more stable.

[0037] Optionally, combined Figure 2 and Figure 3 As shown, the orthographic projection of the limiting portion 12 on the setting plane covers the orthographic projection of the stretching portion 13 on the setting plane, wherein the setting plane is a plane perpendicular to the axis of the threaded hole 111 .

[0038] Specifically, the orthographic projection of the limiting portion 12 on the set plane covers the orthographic projection of the expanding portion 13 on the set plane, which can be understood as follows: the orthographic projection of the expanding portion 13 can be located within the orthographic projection range of the limiting portion 12, or can coincide with the orthographic projection of the limiting portion 12, that is, the orthographic projection area of the limiting portion 12 on the set plane is greater than or equal to the orthographic projection area of the expanding portion 13 on the set plane.

[0039] In this optional embodiment, the size and shape of the limiting hole 21 on the limiting plate 20 are generally compatible with the size and shape of the limiting portion 12 of the nut structure 10. Moreover, since the limiting portion 12 is located in the middle of the nut structure 10, when inserting the limiting portion 12 of the nut structure 10 into the limiting hole 21 of the limiting plate 20, the expansion portion 13 of the nut structure 10 needs to be passed through the limiting hole 21 first. Based on this, in this embodiment, the orthographic projection of the limiting portion 12 on the set plane is set to cover the orthographic projection of the expansion portion 13 on the set plane, so that the outer contour of the expansion portion 13 is smaller than or equal to the outer contour of the limiting portion 12, thereby ensuring that the expansion portion 13 of the nut structure 10 can pass through the limiting hole 21, and further ensuring that the limiting portion 12 of the nut structure 10 can form a plug-in fit with the limiting hole 21 of the limiting plate 20.

[0040] Optionally, combined Figure 3 As shown, the outer contour of the orthographic projection of the stretching portion 13 on the set plane is the inscribed circle of the outer contour of the orthographic projection of the limiting portion 12 on the set plane.

[0041] In this optional embodiment, the orthographic projection of the expansion portion 13 on a given plane is a circular ring-shaped structure, while the orthographic projection of the limiting portion 12 on the given plane is a structure with a regular polygonal outer contour and a circular inner contour. Furthermore, the outer contour of the orthographic projection of the expansion portion 13 is the inscribed circle of the outer contour of the orthographic projection of the limiting portion 12. This allows the volume of the limiting portion 12 to be minimized while ensuring that it can function as a limiting function, thereby reducing the material used in the nut structure 10 and, in turn, lowering production costs.

[0042] Optionally, combined Figure 1 and Figure 3 As shown, the nut structure 10 also includes a flange portion 14, and the nut body portion 11, the flange portion 14, the limiting portion 12 and the tensioning portion 13 are connected in sequence along the axial direction of the threaded hole 111, and the orthographic projection of the limiting portion 12 on the set plane is located within the orthographic projection of the flange portion 14 on the set plane.

[0043] In this optional embodiment, the nut structure 10 is additionally provided with a flange portion 14, and the flange portion 14 is located between the nut body portion 11 and the limiting portion 12. The flange portion 14 is generally a columnar structure, which can be a prismatic structure or a cylindrical structure. In practical applications, it is generally preferred that the flange portion 14 is a cylindrical structure. The central axis of the flange portion 14 is generally arranged colinearly with the axis of the threaded hole 111 to facilitate processing and manufacturing. Moreover, the orthographic projection of the limiting portion 12 on the set plane is located within the orthographic projection of the flange portion 14 on the set plane, that is, the orthographic projection area of the limiting portion 12 is smaller than the orthographic projection area of the flange portion 14.

[0044] In this way, the setting of the flange portion 14 can increase the force-bearing area between the nut structure 10 and the limiting plate 20, thereby improving the limiting effect between the nut structure 10 and the limiting plate 20. Moreover, by setting the orthographic projection of the limiting portion 12 on the set plane to be located within the orthographic projection of the flange portion 14 on the set plane, the flange portion 14 can be used to limit the limiting plate 20 in the axial direction of the threaded hole 111, thereby preventing the limiting plate 20 from separating from the limiting portion 12 of the nut structure 10.

[0045] Combine Figures 4 to 8 As shown, an embodiment of the present invention provides a combined workpiece, including a plate workpiece 30, a limiting plate 20 and the nut structure 10 as described above, the limiting plate 20 is provided with a limiting hole 21, the limiting portion 12 of the nut structure 10 is used to be plugged into and matched with the limiting hole 21, the plate workpiece 30 is provided with a mounting hole 31, the expanding portion 13 of the nut structure 10 is inserted into the mounting hole 31, and is used to abut and cooperate with the hole wall of the mounting hole 31 through expansion and deformation.

[0046] In this embodiment, the size and shape of the limiting hole 21 are generally compatible with the size and shape of the limiting portion 12; the mounting hole 31 can be a cylindrical hole structure or a conical hole structure, which is not specifically limited here. During assembly, the expansion portion 13 of the nut structure 10 is generally first passed through the limiting plate 20 and inserted into the mounting hole 31 of the plate workpiece 30. At the same time, the limiting portion 12 of the nut structure 10 is inserted into the limiting hole 21 of the limiting plate 20. Then, the expansion portion 13 of the nut structure 10 is fixed to the mounting hole 31 of the plate workpiece 30 using an expansion tool. In this way, the nut structure 10 can be fixed to the plate workpiece 30 by clamping rather than welding, so that the nut structure 10 can be pre-embedded on the plate workpiece 30 of different metal materials while ensuring the corrosion resistance of the plate workpiece 30, so as to facilitate the connection between the plate workpiece 30 and other structures; moreover, when the nut structure 10 is clamped to the plate workpiece 30, the setting of the limit plate 20 can increase the contact area with the plate workpiece 30, thereby increasing the force-bearing area, which can effectively prevent the part of the plate workpiece 30 where the mounting hole 31 is provided from being compressed and damaged when the nut structure 10 is connected to the plate workpiece 30.

[0047] Optionally, combined Figure 7 and Figure 8 As shown, one end of the pulling portion 13 away from the limiting portion 12 is flush with the side surface of the plate workpiece 30 away from the limiting plate 20 .

[0048] In this embodiment, when the sheet workpiece 30 is a profile structure, the side surface of the sheet workpiece 30 away from the limiting plate 20 refers to the outer side surface of the side plate of the profile structure in which the mounting hole 31 is provided, that is, the side surface of the side plate located outside the cavity 32. Thus, by arranging the end of the tensioning portion 13 away from the limiting portion 12 to be flush with the side surface of the sheet workpiece 30 away from the limiting plate 20, the connection between the tensioning portion 13 and the sheet workpiece 30 can achieve substantially the same effect as welding, further increasing the axial and torsional loads that the nut structure 10 can withstand.

[0049] Optionally, combined Figure 8 As shown, the plate workpiece 30 is a profile structure with a cavity 32 , the nut structure 10 and the limiting plate 20 are arranged in the cavity 32 , and the cavity wall of the cavity 32 is used to limit the rotation of the limiting plate 20 relative to the plate workpiece 30 .

[0050] In this way, when the nut structure 10 is applied to a plate workpiece 30 of a profile structure, the limiting plate 20 can cooperate with the cavity wall of the cavity 32 of the profile structure to limit the nut structure 10, so as to prevent the nut structure 10 from rotating relative to the plate workpiece 30 when the plate workpiece 30 with the nut structure 10 is connected to other structures through bolts, thereby ensuring that the connection between the plate workpiece 30 of the profile structure and other structures is reliable and firm.

[0051] Optionally, combined Figure 7 and Figure 8 As shown, the mounting hole 31 includes a cylindrical section 311 and a conical section 312 that are interconnected and coaxially arranged. The conical section 312 is located on the side of the cylindrical section 311 away from the limiting plate 20, and the aperture of the conical section 312 increases from the end of the conical section 312 toward the cylindrical section 311 to the end of the conical section 312 away from the cylindrical section 311. In other words, the mounting hole 31 is composed of a circular hole and a conical hole. In this way, the provision of the conical section 312 can increase the contact area between the expansion portion 13 and the hole wall of the mounting hole 31 when the expansion portion 13 of the nut structure 10 expands outward, making the expansion portion 13 and the hole wall of the mounting hole 31 fit more tightly and the clamping connection more firmly.

[0052] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A nut structure, characterized in that: The invention comprises a nut body (11) provided with a threaded hole (111), a limiting portion (12) provided with a first through hole (121) and an expansion portion (13) provided with a second through hole (131); the nut body (11), the limiting portion (12) and the expansion portion (13) are connected in sequence along the axial direction of the threaded hole (111); the threaded hole (111), the first through hole (121) and the second through hole (131) are connected in sequence and coaxially arranged; the expansion portion (13) is used to abut against the hole wall of the mounting hole (31) of the plate workpiece (30) through expansion deformation; the limiting portion (12) is a prismatic structure and is used to be located outside the mounting hole (31).

2. The nut structure according to claim 1, characterized in that: The orthographic projection of the limiting portion (12) on the setting plane covers the orthographic projection of the stretching portion (13) on the setting plane, wherein the setting plane is a plane perpendicular to the axis of the threaded hole (111).

3. The nut structure according to claim 2, characterized in that: The outer contour of the orthographic projection of the stretching portion (13) on the set plane is an inscribed circle of the outer contour of the orthographic projection of the limiting portion (12) on the set plane.

4. The nut structure according to claim 1, characterized in that: The outer side wall of the expansion portion (13) is provided with a groove (132), and the groove (132) is extended along the axial direction of the second through hole (131) and extends from one end to the other end of the expansion portion (13).

5. The nut structure according to claim 4, characterized in that: There are a plurality of grooves (132), and the plurality of grooves (132) are evenly arranged along the circumference of the expansion portion (13).

6. The nut structure according to claim 2, characterized in that: It also includes a flange portion (14), wherein the nut body portion (11), the flange portion (14), the limiting portion (12) and the tensioning portion (13) are connected in sequence along the axial direction of the threaded hole (111), and the orthographic projection of the limiting portion (12) on the set plane is located within the orthographic projection of the flange portion (14) on the set plane.

7. A combined workpiece, characterized in that: It comprises a sheet workpiece (30), a limiting plate (20) and a nut structure as described in any one of claims 1 to 6, wherein the limiting plate (20) is provided with a limiting hole (21), the limiting portion (12) of the nut structure is used to be plugged and matched with the limiting hole (21), the sheet workpiece (30) is provided with a mounting hole (31), the expanding portion (13) of the nut structure is inserted into the mounting hole (31), and is used to abut and match with the hole wall of the mounting hole (31) through expansion and deformation.

8. The composite workpiece according to claim 7, characterized in that One end of the pulling portion (13) away from the limiting portion (12) is flush with the side surface of the plate workpiece (30) away from the limiting plate (20).

9. The composite workpiece according to claim 7, characterized in that The plate workpiece (30) is a profile structure provided with a cavity (32), the nut structure and the limiting plate (20) are arranged in the cavity (32), and the cavity wall of the cavity (32) is used to limit the rotation of the limiting plate (20) relative to the plate workpiece (30).

10. The composite workpiece according to claim 7, characterized in that The mounting hole (31) comprises a cylindrical section (311) and a conical section (312) which are interconnected and coaxially arranged, the conical section (312) being located on a side of the cylindrical section (311) away from the limiting plate (20), and the aperture of the conical section (312) is arranged to increase from one end of the conical section (312) toward the cylindrical section (311) to the end of the conical section (312) away from the cylindrical section (311).

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