Nut

Abstract

The utility model provides a nut which comprises a connecting part and a matching part, the matching part is arranged on the outer side of the connecting part in a sleeved mode, a thread structure is arranged on the inner side wall of the connecting part and used for being connected with a pipeline, a tightening structure is arranged on the outer side wall of the matching part, and the tightening structure is used for being matched with an installation tool to tighten the nut. The material strength of the matching part is greater than that of the connecting part. By means of the technical scheme, the problem that in the prior art, when a nut is tightened through a tightening tool, thread loosening is likely to be caused can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting devices, in particular to a nut. Background Art

[0002] At present, in order to facilitate the interconnection between pipelines, nuts are usually set at the ends of the pipelines. A threaded structure is set on the inner wall of the nut and a tightening structure is set on the outer wall. The nut is tightened by the cooperation of the installation tool and the tightening structure.

[0003] The nut material in the prior art is usually consistent with the material of the connecting structure, usually made of brass. Brass has excellent processing properties and is convenient for processing and forming the nut. However, the hardness of brass is relatively low, and when the installation tool is used to tighten the nut, it is easy to cause the tightening structure to deform and the threads to slip. If the brass is replaced with a material with a higher hardness, the internal thread structure will damage the thread of the connecting structure (brass, client setting) when tightening. Utility Model Content

[0004] The utility model provides a nut to solve the above problem.

[0005] The utility model provides a nut, which includes a connecting portion and a matching portion, wherein the matching portion is sleeved on the outer side of the connecting portion, and the inner side wall of the connecting portion has a threaded structure, the threaded structure is used to connect with a pipeline, and the outer side wall of the matching portion is provided with a tightening structure, the tightening structure is used to tighten the nut in cooperation with an installation tool, wherein the material strength of the matching portion is greater than the material strength of the connecting portion.

[0006] By applying the technical solution provided by the utility model, by setting the material strength of the connecting part to be lower than the material strength of the mating part, the connecting part is made of a material with lower material strength, which can facilitate the processing and forming of the threaded structure. The mating part is made of a material with higher material strength, which can improve the structural strength of the tightening structure and prevent the installation tool from slipping when tightening the nut. Through the technical solution provided by the present application, the material advantages can be fully utilized, and the manufacturing materials of the connecting part and the mating part can be selected according to different usage requirements, taking into account the processing performance of the connecting part and the structural strength of the mating part, thereby improving the performance and service life of the nut.

[0007] Furthermore, the connecting part is made of copper alloy material, and the matching part is made of stainless steel material. Through the above arrangement, the processing performance of the connecting part and the structural strength of the matching part can be guaranteed at the same time, and the overall manufacturing cost of the nut can be reduced.

[0008] Furthermore, the nut has a mounting hole that is arranged through, and the mounting hole has a threaded section, a limiting section and a guide section that are connected in sequence, the threaded structure is arranged on the inner wall of the threaded section, the limiting section is used to limit the axial displacement of the pipeline in the nut, and the guide section is used to guide the connection of the pipeline. Through the above arrangement, the connection effect of the nut when connected to the pipeline can be guaranteed, and the nut can be prevented from falling off from the pipeline after being connected.

[0009] Furthermore, the connecting portion runs through the matching portion, and the connecting portion has a threaded section, a limiting section and a guide section. Through the above arrangement, the material advantages of the connecting portion can be brought into play as much as possible, and the processing quality of the connecting portion can be guaranteed.

[0010] Furthermore, the outer periphery of one end of the connecting portion and the inner periphery of the corresponding end of the matching portion both have chamfered structures, and the chamfered structure of the connecting portion cooperates with the chamfered structure of the matching portion to form a first accommodation space, and the first accommodation space is used to accommodate solder, and the connecting portion and the matching portion are connected by welding. Through the above arrangement, the welding quality between the connecting portion and the matching portion can be guaranteed.

[0011] Furthermore, the connecting part has a threaded section and a limiting section, the matching part has a mounting section and a guide section that are interconnected, and the connecting part is located in the mounting section. Through the above arrangement, the connecting part can be positioned by the guide section to ensure that the connecting part and the matching part can be assembled in place.

[0012] Furthermore, the inner diameter of the mounting section is larger than the inner diameter of the guide section, and a step surface is formed at the connection between the mounting section and the guide section, and one end of the connection part where the limit section is located abuts against the step surface. Through the above arrangement, the step surface can limit the displacement of the connection part in the mounting section, forming a limit on the connection part, and playing a positioning effect on the connection part.

[0013] Furthermore, the threaded section has a free end and a connecting end that are arranged opposite to each other, the connecting end is arranged close to the limiting section, the outer periphery of the free end side of the threaded section and the inner periphery of the corresponding end of the matching portion have a chamfered structure, the chamfered structure of the connecting portion cooperates with the chamfered structure of the matching portion to form a second accommodation space, the second accommodation space is used to accommodate solder, and the connecting portion and the matching portion are connected by welding. Through the above arrangement, the welding quality between the connecting portion and the matching portion can be guaranteed.

[0014] Furthermore, the limiting section is a conical structure, and the inner diameter of the limiting section gradually decreases along the axial direction from the direction away from the threaded section. Through the above arrangement, the limiting section can cooperate with the flared section of the pipeline to form a limiting effect on the pipeline and prevent the nut from falling off the pipeline.

[0015] Furthermore, the connecting portion has a threaded section and a limiting section, and a tool withdrawal groove is arranged between the threaded section and the limiting section. Through the above arrangement, the processing quality of the connecting portion can be guaranteed, and excessive cutting of the tool during the processing of the connecting portion can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A cross-sectional view of a nut provided in the first embodiment of the utility model is shown;

[0018] Figure 2 Shows Figure 1 A partial enlarged view of the middle A;

[0019] Figure 3 A schematic structural diagram of a nut provided in the first embodiment of the utility model is shown;

[0020] Figure 4 A schematic diagram showing the connection between the nut and the pipeline provided in the first embodiment of the utility model is shown;

[0021] Figure 5 A cross-sectional view of a nut provided in a second embodiment of the utility model is shown;

[0022] Figure 6 Shows Figure 5 A partial enlarged view of point B in the middle;

[0023] Figure 7 A schematic diagram of the connection between a nut and a pipeline provided in the second embodiment of the utility model is shown.

[0024] The above drawings include the following reference numerals:

[0025] 10. Connecting part;

[0026] 20. mating portion; 21. mounting section;

[0027] 30. Mounting hole; 31. Threaded section; 32. Limiting section; 33. Guide section;

[0028] 40. chamfer structure; 41. first accommodation space; 42. second accommodation space;

[0029] 50. Back cutter groove. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] like Figures 1 to 6 As shown, an embodiment of the utility model provides a nut, which includes a connecting portion 10 and a mating portion 20. The mating portion 20 is sleeved on the outer side of the connecting portion 10. The inner wall of the connecting portion 10 has a threaded structure, which is used to connect to the pipeline. A tightening structure is provided on the outer wall of the mating portion 20, which is used to tighten the nut in cooperation with an installation tool, wherein the material strength of the mating portion 20 is greater than the material strength of the connecting portion 10.

[0032] By applying the technical solution provided by the utility model, by setting the material strength of the mating part 20 to be greater than the material strength of the connecting part 10, the connecting part 10 is made of a material with lower material strength, which can facilitate the processing and forming of the threaded structure; the mating part 20 is made of a material with higher material strength, which can improve the structural strength of the tightening structure and prevent the installation tool from slipping when tightening the nut. Through the technical solution provided by the present application, the material advantages can be fully utilized, and the manufacturing materials of the connecting part 10 and the mating part 20 can be selected according to different usage requirements, taking into account the processing performance of the connecting part 10 and the structural strength of the mating part 20, thereby improving the performance and service life of the nut.

[0033] In a specific embodiment of the present application, the connecting part 10 is made of a copper alloy material, and specifically, brass material can be selected. Copper alloy has good cutting performance, which is convenient for processing and forming of the threaded structure, and the material has the same hardness as the joint material, so the internal threaded structure will not be damaged when tightening.

[0034] In a specific embodiment of the present application, the mating portion 20 is made of stainless steel material, which has high strength and corrosion resistance, can enhance the structural strength of the tightening structure, prevent the tightening structure from deformation and slipping, and enhance the performance of the nut.

[0035] In a specific embodiment of the present application, the connecting portion 10 is made of a copper alloy material, and the mating portion 20 is made of a stainless steel material. By using the copper alloy material and the stainless steel material for matching, the processing performance of the copper alloy material and the structural strength of the stainless steel material can be utilized to meet the use requirements of the nut. Compared with the traditional technical solution, all the nuts are processed by copper alloy materials, and the material cost is relatively high, resulting in increased manufacturing costs. At the same time, because the copper alloy is easy to deform, the installation tool is prone to slippage when tightening the nut. If the nuts are made of stainless steel materials, the processing difficulty is greater. When tightening the nuts, the threaded structure strength of the nut is relatively large, which is easy to cause damage to the pipe joints. By selecting copper alloy materials and stainless steel materials at the same time, the processing performance of the connecting portion 10 and the structural strength of the mating portion 20 can be taken into account, thereby ensuring the use performance and service life of the nut, and at the same time, the overall manufacturing cost of the nut can be reduced.

[0036] In a specific embodiment of the present application, the tightening structure is a plurality of axially extending edges arranged on the outer surface of the mating portion 20. By providing the tightening structure, the contact area between the installation tool and the mating portion 20 can be increased, making it easier for the installation tool to clamp and tighten the nut.

[0037] In other embodiments of the present application, the tightening structure can also be set to different forms according to different usage scenarios, such as a gear shape or a ram's horn shape, etc., as long as it is convenient for the installation tool to tighten the nut.

[0038] Reference Figure 4 or Figure 7 As shown, in the process of connecting the pipelines, the nut is arranged at the end of one of the pipelines, and the end of the other pipeline is provided with a connector, and the outer wall of the connector is also provided with a threaded structure. The connection of the two pipelines can be achieved by threading the connector with the threaded structure of the nut. In the present application, the nut has a mounting hole 30 that is arranged through, and the mounting hole 30 has a threaded section 31, a limiting section 32 and a guide section 33 that are connected in sequence. The threaded structure is arranged on the inner wall of the threaded section 31, the limiting section 32 is used to limit the axial displacement of the pipeline in the nut, and the guide section 33 is used to guide the connection of the pipeline. Through the above arrangement, the threaded section 31 can cooperate with the threaded structure of the connector to achieve the connection of the pipeline, the inner wall of the guide section 33 cooperates with the outer wall of the pipeline to guide the connection of the pipeline, and the limiting section 32 can cooperate with the flaring structure at the end of the pipeline to limit the movement of the pipeline in the direction away from the threaded section 31, and prevent the pipeline from falling off from the mounting hole 30, so as to ensure the connection effect of the nut and improve the stability of the pipeline connection.

[0039] In a specific embodiment of the present application, the limiting section 32 is a conical structure, and the inner diameter of the limiting section 32 gradually decreases along the axial direction from the direction away from the threaded section 31. Through the above arrangement, the end face of the limiting section 32 facing the threaded section 31 can abut against the flared structure of the pipeline, while limiting the pipeline, it can form a sealing surface to prevent leakage of the pipeline at the connection point of the nut, further improving the tightness of the nut when connecting the pipeline.

[0040] In other embodiments of the present application, the limiting section 32 can also be adjusted according to the structure of different connecting pipes, such as an arc section or a step section, etc., as long as it can play a limiting and sealing role on the pipeline.

[0041] Reference Figure 1 As shown, in the first embodiment of the present application, the connection portion 10 runs through the matching portion 20, and the connection portion 10 has a threaded section 31, a stop section 32, and a guide section 33. Through the above arrangement, the threaded section 31, the stop section 32, and the guide section 33 are all arranged on the connection portion 10, which can fully utilize the processing performance of the connection portion 10 with relatively low material strength, and facilitate the forming and processing of the threaded section 31, the stop section 32, and the guide section 33, while the matching portion 20 with relatively high material strength and poor processing performance can be integrally formed through a stamping process, which facilitates the processing of the matching portion 20.

[0042] Specifically, the connecting part 10 can be processed by turning to form a threaded section 31, a limiting section 32 and a guide section 33, and the mating part 20 can be formed by stamping a tightening structure on the outer wall and a through hole on the inner wall, and the processed connecting part 10 can be installed into the through hole of the mating part 20, and the mating part 20 and the connecting part 10 can be connected by welding to ensure the stable connection between the connecting part 10 and the mating part 20, thereby ensuring the stability of the overall structure of the nut.

[0043] Reference Figure 2 and Figure 3 As shown, the outer periphery of one end of the connecting portion 10 and the inner periphery of the corresponding end of the matching portion 20 both have a chamfered structure 40, and the chamfered structure 40 of the connecting portion 10 cooperates with the chamfered structure 40 of the matching portion 20 to form a first accommodating space 41, and the first accommodating space 41 is used to accommodate solder, and the connecting portion 10 and the matching portion 20 are connected by welding. Through the above arrangement, the first accommodating space 41 can accommodate solder to facilitate the welding connection of the connecting portion 10 and the matching portion 20, ensure welding quality, improve processing efficiency, and the melted solder can be flush with the end faces of the connecting portion 10 and the matching portion 20.

[0044] Specifically, the chamfer structure 40 can be separately set at one end of the connecting part 10 and the matching part 20 close to the threaded section 31, or separately set at one end of the connecting part 10 and the matching part 20 close to the guide section 33, as long as it can facilitate welding operations and improve processing efficiency.

[0045] Specifically, the chamfered structure 40 can also be simultaneously arranged at the two opposite ends of the nut. By simultaneously welding the connecting part 10 and the mating part 20 at the two opposite ends of the nut, a reliable connection between the connecting part 10 and the mating part 20 can be formed, thereby improving the connection strength between the connecting part 10 and the mating part 20, avoiding relative rotation between the connecting part 10 and the mating part 20 during the tightening process of the nut, and ensuring the performance of the nut.

[0046] Reference Figure 5 As shown, in the second embodiment of the present application, the connecting portion 10 has a threaded section 31 and a limiting section 32, the matching portion 20 has a mounting section 21 and a guide section 33 that are interconnected, and the connecting portion 10 is located in the mounting section 21. Different from the first embodiment, in the second embodiment, the guide section 33 is arranged on the matching portion 20, and the connecting portion 10 only has a threaded section 31 and a limiting section 32. In this way, when the connecting portion 10 and the matching portion 20 are combined, the connecting portion 10 can be positioned by the guide section 33, which facilitates the positioning and installation of the connecting portion 10, improves the installation efficiency, ensures the installation effect of the connecting portion 10, and prevents the possible installation deviation between the connecting portion 10 and the matching portion 20 from causing quality problems.

[0047] Furthermore, the inner diameter of the mounting section 21 is larger than the inner diameter of the guide section 33, and a step surface is formed at the connection between the mounting section 21 and the guide section 33, and one end of the limiting section 32 of the connecting portion 10 is in contact with the step surface. The step surface can limit the displacement of the connecting portion 10 in the mounting section 21, forming a limit for the connecting portion 10, preventing the connecting portion 10 from excessively entering the mounting section 21, and ensuring the installation effect between the connecting portion 10 and the mating portion 20.

[0048] Specifically, the connecting part 10 can be processed into a threaded section 31 and a limit section 32 by turning, and the mating part 20 can be processed into a mounting section 21 and a guide section 33 by stamping and cutting processes. The processed connecting part 10 can be installed into the mating part 20 by press-fitting, and the mating part 20 and the connecting part 10 can be connected by welding to ensure the stable connection between the connecting part 10 and the mating part 20, thereby ensuring the stability of the overall structure of the nut.

[0049] Reference Figure 6As shown, the outer periphery of the free end side of the threaded section 31 and the inner periphery of the corresponding end of the matching portion 20 have a chamfered structure 40, and the chamfered structure 40 of the connecting portion 10 cooperates with the chamfered structure 40 of the matching portion 20 to form a second accommodating space 42, and the second accommodating space 42 is used to accommodate solder, and the connecting portion 10 and the matching portion 20 are welded and connected. Through the above arrangement, the second accommodating space 42 can accommodate solder to facilitate the welding connection of the connecting portion 10 and the matching portion 20, ensure the welding quality, and improve the processing efficiency. In this embodiment, through the stepped surface of the guide section 33 and the welding connection between the connecting portion 10 and the matching portion 20, the connecting portion 10 and the matching portion 20 can be stably connected, further improving the integrity of the nut and ensuring the use effect of the nut.

[0050] In other embodiments of the present application, the connection portion 10 has a threaded section 31, the matching portion 20 has a mounting section 21, a limiting section 32 and a guide section 33 that are interconnected, and the connection portion 10 is located in the mounting section 21. Through the above arrangement, the processing difficulty of the connection portion 10 can be simplified, and the tool is prevented from bumping against the threaded section 31 when processing other structures, thereby affecting the processing quality of the threaded structure.

[0051] In some embodiments of the present application, a chamfered structure 40 may also be provided on the periphery of the port of the mounting hole 30 close to the guide section 33. When the pipeline is plugged into the guide section 33, a third accommodating space may be formed between the chamfered structure 40 and the side wall of the pipeline to realize a welding connection between the nut and the pipeline.

[0052] In the present application, the connection portion 10 has a threaded section 31 and a stop section 32, and a tool backing groove 50 is provided between the threaded section 31 and the stop section 32. Through the above configuration, the tool backing groove 50 provided between the threaded section 31 and the stop section 32 prevents the tool from continuing to cut the connection portion 10 after processing the threaded section 31 and the stop section 32, so as to ensure the processing quality of the connection portion 10.

[0053] Compared with the existing technical solutions, the technical solution provided by this application has the following technical advantages:

[0054] 1. The nut is composed of two parts with different material strengths. The internal connecting part 10 is made of a material with relatively low material strength and excellent processing performance, such as brass, and the external matching part 20 is made of a material with relatively high material strength, such as stainless steel, which can take into account the cutting performance of brass and the structural strength of stainless steel, thereby increasing the service life of the nut;

[0055] 2. The nuts of the conventional technical solutions are usually made of brass material as a whole, which has a high material cost. The technical solution provided by the present application can reduce the overall processing cost of the nuts;

[0056] 3. By providing the first accommodating space 41 or the second accommodating space 42 to accommodate solder, the connection effect between the connecting portion 10 and the matching portion 20 is improved, the welding strength is ensured, and the connection strength between the connecting portion 10 and the matching portion 20 is improved.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0059] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0060] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0061] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0062] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A nut, characterized in that: The nut comprises a connecting portion (10) and a matching portion (20), wherein the matching portion (20) is sleeved on the outer side of the connecting portion (10), and the inner side wall of the connecting portion (10) has a threaded structure, and the threaded structure is used to connect to a pipeline, and the outer side wall of the matching portion (20) is provided with a tightening structure, and the tightening structure is used to tighten the nut in cooperation with an installation tool, wherein the material strength of the matching portion (20) is greater than the material strength of the connecting portion (10).

2. The nut according to claim 1, characterized in that: The connecting portion (10) is made of a copper alloy material, and the matching portion (20) is made of a stainless steel material.

3. The nut according to claim 1, characterized in that: The nut has a mounting hole (30) extending therethrough, the mounting hole (30) having a threaded section (31), a limiting section (32) and a guiding section (33) which are connected in sequence, the threaded structure being arranged on the inner wall of the threaded section (31), the limiting section (32) being used for limiting the axial displacement of the pipeline in the nut, and the guiding section (33) being used for guiding the connection of the pipeline.

4. The nut according to claim 3, characterized in that: The connecting portion (10) passes through the matching portion (20), and the connecting portion (10) comprises the threaded section (31), the limiting section (32) and the guiding section (33).

5. The nut according to claim 4, characterized in that: The outer periphery of one end of the connecting portion (10) and the inner periphery of the corresponding end of the matching portion (20) both have a chamfered structure (40); the chamfered structure (40) of the connecting portion (10) cooperates with the chamfered structure (40) of the matching portion (20) to form a first accommodating space (41); the first accommodating space (41) is used to accommodate solder; the connecting portion (10) and the matching portion (20) are connected by welding.

6. The nut according to claim 3, characterized in that: The connecting portion (10) comprises the threaded section (31) and the limiting section (32); the matching portion (20) comprises the mounting section (21) and the guiding section (33) which are connected to each other; and the connecting portion (10) is located inside the mounting section (21).

7. The nut according to claim 6, characterized in that: The inner diameter of the mounting section (21) is greater than the inner diameter of the guide section (33); a step surface is formed at the connection between the mounting section (21) and the guide section (33); and one end of the connection portion (10) where the limiting section (32) is located abuts against the step surface.

8. The nut according to claim 6, characterized in that: The threaded section (31) has a free end and a connecting end that are arranged opposite to each other, and the connecting end is arranged close to the limiting section (32). The outer periphery of the free end side of the threaded section (31) and the inner periphery of the corresponding end of the matching portion (20) have a chamfered structure (40). The chamfered structure (40) of the connecting portion (10) cooperates with the chamfered structure (40) of the matching portion (20) to form a second accommodating space (42). The second accommodating space (42) is used to accommodate solder. The connecting portion (10) and the matching portion (20) are connected by welding.

9. The nut according to claim 3, characterized in that: The limiting section (32) is a conical structure, and the inner diameter of the limiting section (32) gradually decreases along the axial direction from the direction away from the threaded section (31).

10. The nut according to claim 3, characterized in that: The connecting portion (10) comprises the threaded section (31) and the limiting section (32), and a tool withdrawal groove (50) is provided between the threaded section (31) and the limiting section (32).

Images