CN223190810U - Nut structure and combined workpiece - Google Patents

Abstract

The present invention provides a nut structure and a combined workpiece, relating to the technical field of nuts. The nut structure comprises a nut body with a threaded hole, a limiting portion with a first through-hole, and an expansion portion with a second through-hole. The nut body, the limiting portion, and the expansion portion 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 connected and coaxially arranged. The expansion 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 has a prismatic structure and is used to be located outside the mounting hole. In this way, the nut structure is fixed to the mounting hole of the plate workpiece by a snap-fit method, which not only can achieve the fixation of the nut structure on the plate workpiece, but also can ensure that the metal plating on the surface of the plate workpiece is not damaged.

Description

Nut structure and combined workpiece

Technical Field

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

Background

At present, a nut made of steel is welded on an automobile part made of aluminum alloy in a protruding mode to achieve connection with other parts, but electrochemical corrosion is easy to occur at a steel-aluminum contact part when the nut is welded due to the fact that the nut and the automobile part are made of different metal materials, a plating layer on the metal surface is damaged, and therefore the automobile part welded with the nut is easy to corrode and cannot meet the use requirement of corrosion resistance.

Disclosure of utility model

The utility model solves the problem of improving the corrosion resistance of automobile parts under the condition of ensuring connection.

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

In a first aspect, the utility model provides a nut structure, which comprises a nut body part provided with a threaded hole, a limiting part provided with a first through hole and a pulling and expanding part provided with a second through hole, wherein the nut body part, the limiting part and the pulling and expanding part are sequentially connected along the axial direction of the threaded hole, the first through hole and the second through hole are sequentially communicated and coaxially arranged, the pulling and expanding part is used for being in butt fit with the hole wall of a mounting hole of a plate workpiece through expansion deformation, and the limiting part is of a prismatic structure and is positioned outside the mounting hole.

Optionally, the orthographic projection of the limiting part on a set plane covers the orthographic projection of the expanding part on the set plane, wherein the set plane is a plane perpendicular to the axis of the threaded hole.

Optionally, the outer contour of the orthographic projection of the expanding portion on the setting plane is an inscribed circle of the outer contour of the orthographic projection of the limiting portion on the setting plane.

Optionally, a groove is formed in the outer side wall of the stretching portion, and the groove extends along the axial direction of the second through hole and extends from one end to the other end of the stretching portion.

Optionally, the grooves are provided in plurality, and the grooves are uniformly arranged along the circumferential direction of the stretching part.

Optionally, the nut structure further includes a flange portion, the nut body portion, the flange portion, the limiting portion, and the tensioning portion are sequentially connected along an axial direction of the threaded hole, and an orthographic projection of the limiting portion on the setting plane is located in an orthographic projection of the flange portion on the setting plane.

In a second aspect, the utility model provides a combined workpiece, which comprises a plate workpiece, a limiting plate and the nut structure, wherein the limiting plate is provided with a limiting hole, a limiting part of the nut structure is used for being matched with the limiting hole in an inserting mode, the plate workpiece is provided with a mounting hole, and a pulling and expanding part of the nut structure is inserted into the mounting hole and is used for being in butt joint with the hole wall of the mounting hole through expansion deformation.

Optionally, one end of the pulling and expanding part far away from the limiting part is flush with the side surface of one side of the plate workpiece far away from the limiting plate.

Optionally, the plate workpiece is a section structure provided with a cavity, the nut structure and the limiting plate are arranged in the cavity, and the cavity wall of the cavity is used for limiting the limiting plate to rotate relative to the plate workpiece.

Optionally, the mounting hole includes the cylinder section and the circular cone section of intercommunication and coaxial setting each other, the circular cone section is located the cylinder section is kept away from one side of limiting plate, just the aperture of circular cone section is followed the circular cone section is towards the one end of cylinder section to the circular cone section is kept away from the one end of cylinder section is the setting of increasing.

The nut structure has the advantages that the nut body part, the limiting part and the tensioning part can be arranged, and the threaded hole, the first through hole and the second through hole which are coaxially communicated are respectively arranged on the nut body part, the limiting part and the tensioning part, so that when the nut structure is used, the tensioning part of the nut structure can be inserted into the mounting hole of a plate workpiece, then the nut body part or the limiting part of the nut structure is fixed by adopting auxiliary tools such as a spanner, so as to prevent the nut structure from rotating, the threaded section of the tensioning tool (namely, a bolt with the threaded section and the conical section) sequentially passes through the second through hole and the first through hole of the nut structure and then is screwed into the threaded hole, the tensioning part is enabled to be tensioned and deformed under the extrusion action of the conical section of the tensioning tool, and then the tensioning part is enabled to be tightly abutted with the mounting hole, the nut structure is fixed at the mounting hole of a plate workpiece in a clamping manner, the nut structure can be fixed on the workpiece, the metal coating on the surface of the workpiece can be prevented from being damaged, and the plate workpiece can be conveniently connected with other plate workpieces under the condition that different metal structures are guaranteed. Meanwhile, the limiting part is arranged to be of a prismatic structure and is positioned outside the mounting hole of the plate workpiece, so that the nut structure can be matched with a limiting plate and the like to limit the nut structure when the nut structure is applied to the plate workpiece of the profile structure, the nut structure is prevented from rotating when being fastened and connected with a bolt, and connection between the plate workpiece of the profile structure and other structures is ensured to be reliable and firm.

Drawings

FIG. 1 is a schematic view of a nut structure according to an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a nut structure in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic top view of a nut structure according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a nut structure and a limiting plate assembled according to an embodiment of the present utility model;

FIG. 5 is a schematic cross-sectional view of a nut structure assembled with a retainer plate according to an embodiment of the present utility model;

FIG. 6 is a schematic view of the nut structure, limiting plate and plate workpiece assembly in accordance with an embodiment of the present utility model;

FIG. 7 is a schematic cross-sectional view of the nut structure, limiting plate and plate work-piece of the first embodiment of the present utility model;

Fig. 8 is a schematic cross-sectional view of a nut structure, a limiting plate and a plate workpiece assembled in a second embodiment of the utility model.

Reference numerals illustrate:

10. The nut comprises a nut structure, a nut body part, 111, a threaded hole, 12, a limiting part, 121, a first through hole, 13, a pulling and expanding part, 131, a second through hole, 132, a groove, 14, a flange part, 20, a limiting plate, 21, a limiting hole, 30, a plate workpiece, 31, a mounting hole, 311, a cylindrical section, 312, a conical section, 32 and a cavity.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. While the utility model is susceptible of embodiment in the drawings, it is to be understood that the utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided to provide a more thorough and complete understanding of the utility model. It should be understood that the drawings and embodiments of the utility model are for illustration purposes only and are not intended to limit the scope of the present utility model.

The Z-axis in the drawing represents the vertical direction, i.e., the up-down position, and the forward direction of the Z-axis represents the up direction and the reverse direction of the Z-axis represents the down direction. It should also be noted that the foregoing Z-axis is provided merely for convenience of description and to simplify the description and is not to be construed as indicating or implying that the apparatus or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present utility model.

The term "comprising" and variations thereof as used herein is meant to be open-ended, i.e., "including but not limited to," based at least in part on, "one embodiment" means "at least one embodiment," another embodiment "means" at least one additional embodiment, "some embodiments" means "at least some embodiments," and "optional" means "optional embodiment. Related definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish between different devices, modules or units, and are not intended to limit the order or interdependence of functions performed by these devices, modules or units.

It should be noted that references to "a" and "an" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.

Referring to fig. 1, fig. 2, fig. 7 and fig. 8, the nut structure 10 provided by the embodiment of the utility model includes a nut body portion 11 provided with a threaded hole 111, a limiting portion 12 provided with a first through hole 121, and a tensioning portion 13 provided with a second through hole 131, where the nut body portion 11, the limiting portion 12 and the tensioning portion 13 are sequentially connected along an axial direction of the threaded hole 111, the first through hole 121 and the second through hole 131 are sequentially communicated and coaxially arranged, and the tensioning portion 13 is used for being in abutting fit with a hole wall of a mounting hole 31 of a plate workpiece 30 through expansion deformation, and the limiting portion 12 is in a prismatic structure and is used for being located outside the mounting hole 31.

Specifically, the nut structure 10 in this embodiment mainly includes three parts, namely, a nut body 11, a limiting part 12 and a tensioning part 13, which are sequentially connected, wherein the nut body 11 is a part bearing internal threads, the tensioning part 13 is used for abutting and matching with a hole wall of a mounting hole 31 of the nut structure 10 through expansion deformation or pulling expansion 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 plate-shaped plate workpiece 30, the limiting part 12 is used for limiting the nut structure 10 when the nut structure 10 is fixed on the plate workpiece 30, and is matched with an auxiliary tool such as a wrench to limit the nut structure 10 when the nut structure 10 is applied to the plate workpiece 30, and can also be used for limiting the nut structure 10 through matching with an external structure such as a limiting plate 20, so as to prevent the nut structure 10 from rotating relative to the plate workpiece 30 when the plate workpiece 30 is connected with other structures through a bolt.

More specifically, the nut body 11, the limiting portion 12 and the expanding portion 13 are generally in a columnar structure, wherein the limiting portion 12 is in a prismatic structure, for example, fig. 1 shows an example in which the limiting portion 12 is in a hexagonal prismatic structure, and the nut body 11 and the expanding portion 13 may be in a columnar structure or a prismatic structure, and when the expanding portion 13 is in a prismatic structure, the mounting hole 31 of the plate workpiece 30 is also in a prismatic through hole structure because the mounting hole 31 of the plate workpiece 30 is generally matched with the expanding portion 13. However, in practical use, as shown in fig. 1, it is generally preferable that the nut body 11 has a prismatic structure and the expansion portion 13 has a cylindrical structure. Meanwhile, the nut body portion 11 is provided with a threaded hole 111 in a penetrating manner along the central axis direction, the limiting portion 12 is provided with a first through hole 121 in a penetrating manner along the central axis direction, the pulling portion 13 is provided with a second through hole 131 in a penetrating manner along the central axis direction, and the threaded hole 111, the first through hole 121 and the second through hole 131 are sequentially communicated and coaxially arranged, wherein the first through hole 121 and the second through hole 131 are of a circular unthreaded hole structure, and the apertures of the first through hole 121 and the second through hole 131 are generally larger than the large diameter of the threaded hole 111, so that a bolt can conveniently and rapidly penetrate through the second through hole 131 and the first through hole 121 to form threaded connection with the threaded hole 111.

The nut structure 10 in this embodiment may be provided with the nut body portion 11, the limiting portion 12 and the tensioning portion 13, and the threaded hole 111, the first through hole 121 and the second through hole 131 which are coaxially connected are respectively provided on the nut body portion 11, the limiting portion 12 and the tensioning portion 13, so that when in use, the tensioning portion 13 of the nut structure 10 may be inserted into the mounting hole 31 of the plate workpiece 30, then the nut body portion 11 or the limiting portion 12 of the nut structure 10 is fixed by adopting an auxiliary tool such as a wrench, so as to prevent the nut structure 10 from rotating, and then the threaded section of the tensioning tool (i.e. the bolt with the threaded section and the conical section) is screwed into the threaded hole 111 after sequentially passing through the second through hole 131 and the first through hole 121 of the nut structure 10, so that the tensioning portion 13 is tensioned and deformed under the extrusion action of the conical section of the tensioning tool, and further the tensioning portion 13 is abutted against the wall of the mounting hole 31, so that the nut structure 10 is fixed at the mounting hole 31 of the plate workpiece 30 in a clamping manner, so that the nut structure 10 is not only can be fixed on the workpiece 30, but also the plate workpiece 30 is guaranteed to be tightly damaged, and the plate workpiece 30 is not to be connected to the plate workpiece 30 in advance, and the plate workpiece 30 is not guaranteed to be in the condition that the plate structure is not easy to be connected to the plate workpiece 30. Meanwhile, the limiting part 12 is arranged to be of a prismatic structure and is positioned outside the mounting hole 31 of the plate workpiece 30, so that when the nut structure 10 is applied to the plate workpiece 30 of the profile structure, the nut structure 10 can be limited by being matched with the limiting plate 20 and the like, the nut structure 10 is prevented from rotating when being fastened and connected with a bolt, and the connection between the plate workpiece 30 of the profile structure and other structures is ensured to be reliable and firm.

Alternatively, as shown in fig. 1, the outer side wall of the pulling and expanding portion 13 is provided with a groove 132, and the groove 132 is provided extending in the axial direction of the second through hole 131 and extends from one end to the other end of the pulling and expanding portion 13.

In the present alternative embodiment, the recess 132 may be disposed longitudinally, i.e., extending in the axial direction of the second through hole 131, or may be disposed obliquely with respect to the axial direction of the second through hole 131, which is not particularly limited herein. In this way, the groove 132 is formed in the outer side wall of the stretching portion 13, so that the local thickness of the stretching portion 13 is reduced, the stretching portion 13 is convenient to expand, the contact area between the stretching portion 13 and the hole wall of the mounting hole 31 can be increased after the stretching portion 13 expands, and the contact area between the stretching portion 13 and the plate workpiece 30 is further increased, so that the connection between the nut structure 10 and the plate workpiece 30 is more stable. Meanwhile, the grooves 132 are arranged along the axial extension of the second through holes 131, so that the convenience of machining the grooves 132 can be improved, and the production efficiency of the nut structure 10 can be improved, and the grooves 132 extend from one end of the stretching portion 13 to the other end, so that the thickness of the stretching portion 13 can be uniformly distributed in the central axis direction of the stretching portion 13, and the stretching portion 13 can be better adapted to plate workpieces 30 with different plate thicknesses.

Alternatively, as shown in connection with fig. 1, the grooves 132 are provided in plural, and the plural grooves 132 are uniformly provided in the circumferential direction of the pulling-up portion 13. Like this, not only can further reduce the local thickness of portion 13 that rises that draws, still make the thickness that draws portion 13 that rises be evenly distributed, conveniently draw portion 13 to accomplish the expansion fast and open outward, simultaneously, also can further increase the area of contact between portion 13 that draws and the panel work piece 30 that rises for the connection between nut structure 10 and the panel work piece 30 is more stable.

Alternatively, as shown in fig. 2 and 3, the orthographic projection of the stopper portion 12 on the setting plane, which is a plane perpendicular to the axis of the screw hole 111, covers the orthographic projection of the pull-up portion 13 on the setting plane.

Specifically, the orthographic projection of the limiting portion 12 on the setting plane covers the orthographic projection of the expanding portion 13 on the setting plane, which is to be understood that the orthographic projection of the expanding portion 13 may be located within the orthographic projection range of the limiting portion 12 or may coincide with the orthographic projection of the limiting portion 12, that is, the orthographic projection area of the limiting portion 12 on the setting plane is greater than or equal to the orthographic projection area of the expanding portion 13 on the setting plane.

In this alternative embodiment, the size and shape of the limiting hole 21 on the limiting plate 20 are generally matched to the size and shape of the limiting portion 12 of the nut structure 10, and since the limiting portion 12 is located at the middle position 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 pulling portion 13 of the nut structure 10 needs to be inserted through the limiting hole 21 first. Based on this, in this embodiment, the front projection of the limiting portion 12 on the setting plane is set to cover the front projection of the expanding portion 13 on the setting plane, so that the outer contour of the expanding portion 13 is smaller than or equal to the outer contour of the limiting portion 12, so as to ensure that the expanding portion 13 of the nut structure 10 can pass through the limiting hole 21, and further ensure 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.

Alternatively, as shown in fig. 3, the outer contour of the orthographic projection of the expanding portion 13 on the setting plane is an inscribed circle of the outer contour of the orthographic projection of the limiting portion 12 on the setting plane.

In this alternative embodiment, the orthographic projection of the stretching portion 13 on the setting plane is in a circular ring structure, the orthographic projection of the limiting portion 12 on the setting plane is in a structure with a regular polygon outer contour and a circular inner contour, and the orthographic projection outer contour of the stretching portion 13 is an inscribed circle of the orthographic projection outer contour of the limiting portion 12. Thus, the volume of the limiting part 12 can be reduced as much as possible under the condition that the limiting part 12 can play a limiting role, so that the material consumption of the nut structure 10 is reduced, and the production cost is further reduced.

Optionally, as shown in fig. 1 and 3, the nut structure 10 further includes a flange portion 14, where the nut body portion 11, the flange portion 14, the limiting portion 12, and the tensioning portion 13 are sequentially connected along an axial direction of the threaded hole 111, and an orthographic projection of the limiting portion 12 on a set plane is located in an orthographic projection of the flange portion 14 on the set plane.

In this alternative 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 14 is generally cylindrical, and may be prismatic or cylindrical, and in practice, it is generally preferable that the flange 14 be cylindrical. The central axis of the flange portion 14 is generally aligned with the axis of the threaded bore 111 for ease of manufacturing. The orthographic projection of the limiting portion 12 on the setting plane is located within the orthographic projection of the flange portion 14 on the setting plane, that is, the orthographic projection area of the limiting portion 12 is smaller than the orthographic projection area of the flange portion 14.

In this way, the arrangement of the flange portion 14 can increase the stress area between the nut structure 10 and the limiting plate 20, so as to improve the limiting effect between the nut structure 10 and the limiting plate 20, and the orthographic projection of the limiting portion 12 on the setting plane is arranged to be positioned in the orthographic projection of the flange portion 14 on the setting plane, so that the limiting plate 20 is limited by the flange portion 14 in the axial direction of the threaded hole 111, and the limiting plate 20 is prevented from being separated from the limiting portion 12 of the nut structure 10.

Referring to fig. 4 to 8, a combined workpiece provided by the embodiment of the utility model includes a plate workpiece 30, a limiting plate 20 and a nut structure 10 as described above, wherein the limiting plate 20 is provided with a limiting hole 21, a limiting portion 12 of the nut structure 10 is used for being in plug-in fit with the limiting hole 21, the plate workpiece 30 is provided with a mounting hole 31, and a pulling and expanding portion 13 of the nut structure 10 is inserted into the mounting hole 31 and is used for being in butt fit with a hole wall of the mounting hole 31 through expansion deformation.

In this embodiment, the size and shape of the limiting hole 21 are generally adapted to the size and shape of the limiting portion 12, and the mounting hole 31 may be a cylindrical hole structure or a conical hole structure, which is not particularly limited herein. During assembly, the stretching portion 13 of the nut structure 10 is usually inserted through the limiting plate 20 and into the mounting hole 31 of the plate workpiece 30, meanwhile, the limiting portion 12 of the nut structure 10 is inserted into the limiting hole 21 of the limiting plate 20, and then the stretching portion 13 of the nut structure 10 is fixed at the mounting hole 31 of the plate workpiece 30 by using a stretching tool. In this way, the nut structure 10 can be fixed on the plate workpiece 30 in a clamping rather than welding manner, so that the nut structure 10 can be embedded on the plate workpiece 30 made of different metal materials under the condition of ensuring the corrosion resistance of the plate workpiece 30, so that the plate workpiece 30 is connected with other structures, and when the nut structure 10 is clamped on the plate workpiece 30, the setting of the limiting plate 20 can enlarge the contact area with the plate workpiece 30, further enlarge the stress area, and effectively prevent the part, provided with the mounting hole 31, of the plate workpiece 30 from being compressed and damaged when the nut structure 10 is connected with the plate workpiece 30.

Alternatively, as shown in conjunction with fig. 7 and 8, the end of the pulling-up portion 13 remote from the limiting portion 12 is flush with the side of the sheet material work piece 30 remote from the limiting plate 20.

In this embodiment, when the plate workpiece 30 is in a profile structure, the side surface of the plate workpiece 30 away from the side of the limiting plate 20 refers to the outer side surface of the side plate provided with the mounting hole 31 in the profile structure, that is, the side surface of the side plate located outside the cavity 32. In this way, by setting the end of the pull-up portion 13 away from the limiting portion 12 flush with the side surface of the side of the plate workpiece 30 away from the limiting plate 20, the connection between the pull-up portion 13 and the plate workpiece 30 can achieve approximately the same effect as welding, and the axial load and the torsional load that can be borne by the nut structure 10 can be further improved.

Alternatively, as shown in connection with fig. 8, the plate work piece 30 is a profile structure provided with a cavity 32, the nut structure 10 and the limiting plate 20 are disposed 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 work piece 30.

Thus, when the nut structure 10 is applied to the plate workpiece 30 of the 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 that when the plate workpiece 30 with the nut structure 10 is connected with other structures through bolts, the nut structure 10 is prevented from rotating relative to the plate workpiece 30, and the connection between the plate workpiece 30 of the profile structure and the other structures is ensured to be reliable and firm.

Alternatively, as shown in fig. 7 and 8, the mounting hole 31 includes a cylindrical section 311 and a conical section 312 which are mutually communicated and coaxially arranged, the conical section 312 is located on a side of the cylindrical section 311 away from the limiting plate 20, and the aperture of the conical section 312 is gradually increased from one end of the conical section 312 toward the cylindrical section 311 to one end of the conical section 312 away from the cylindrical section 311. That is, the mounting hole 31 is formed by combining a circular hole and a tapered hole. In this way, the conical section 312 can increase the contact area between the expanding portion 13 and the wall of the mounting hole 31 when the expanding portion 13 of the nut structure 10 expands, so that the expanding portion 13 and the wall of the mounting hole 31 are more tightly attached and clamped firmly.

Although the utility model is disclosed above, the scope of the utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the scope of the utility model.

Claims (10)

1. The utility model provides a nut structure, its characterized in that includes nut body portion (11) that are equipped with screw hole (111), is equipped with spacing portion (12) of first through-hole (121) and is equipped with the portion that rises (13) of second through-hole (131), nut body portion (11) spacing portion (12) with portion that rises (13) are followed the axial of screw hole (111) is connected gradually, screw hole (111) first through-hole (121) with second through-hole (131) communicate in proper order and coaxial setting, portion that rises (13) are used for through the pore wall butt cooperation of the mounting hole (31) of expansion deformation with panel work piece (30), spacing portion (12) are prismatic structure, and are used for being located the outside of mounting hole (31).

2. Nut structure according to claim 1, characterized in that the orthographic projection of the limit portion (12) on a set plane covers the orthographic projection of the pull-up portion (13) on the set plane, wherein the set plane is a plane perpendicular to the axis of the threaded hole (111).

3. Nut structure according to claim 2, characterized in that the outer contour of the orthographic projection of the pull-up part (13) on the setting plane is an inscribed circle of the outer contour of the orthographic projection of the limit part (12) on the setting plane.

4. Nut structure according to claim 1, characterized in that the outer side wall of the pulling and expanding part (13) is provided with a groove (132), the groove (132) extending in the axial direction of the second through hole (131) and extending from one end to the other end of the pulling and expanding part (13).

5. Nut structure according to claim 4, characterized in that the grooves (132) are provided in plurality, and the plurality of grooves (132) are uniformly arranged along the circumferential direction of the pull-up portion (13).

6. Nut structure according to claim 2, further comprising a flange portion (14), wherein the nut body portion (11), the flange portion (14), the limiting portion (12) and the pulling-up portion (13) are connected in sequence along an axial direction of the screw hole (111), and an orthographic projection of the limiting portion (12) on the setting plane is located within an orthographic projection of the flange portion (14) on the setting plane.

7. The combined workpiece is characterized by comprising a plate workpiece (30), a limiting plate (20) and the nut structure according to any one of claims 1-6, wherein the limiting plate (20) is provided with a limiting hole (21), a limiting part (12) of the nut structure is used for being matched with the limiting hole (21) in an inserting mode, the plate workpiece (30) is provided with a mounting hole (31), and a pulling and expanding part (13) of the nut structure is inserted into the mounting hole (31) and used for being matched with the hole wall of the mounting hole (31) in an abutting mode through expansion deformation.

8. The combined workpiece according to claim 7, characterized in that the end of the pulling-up part (13) remote from the limit part (12) is flush with the side of the sheet workpiece (30) remote from the limit plate (20).

9. The combination work piece according to claim 7, wherein the sheet work piece (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 a cavity wall of the cavity (32) is used for limiting the rotation of the limiting plate (20) relative to the sheet work piece (30).

10. The combined workpiece according to claim 7, characterized in that the mounting hole (31) comprises a cylindrical section (311) and a conical section (312) which are communicated with each other and coaxially arranged, the conical section (312) is positioned on one side of the cylindrical section (311) away from the limiting plate (20), and the aperture of the conical section (312) is gradually increased from one end of the conical section (312) towards the cylindrical section (311) to one end of the conical section (312) away from the cylindrical section (311).