Anti-loosening double-nut pressing type quick coupler and locking method of quick coupler

Abstract

The invention discloses an anti-loosening double-nut pressing type quick coupler and a locking method of the quick coupler, and relates to the technical field of sealing joints. Comprising a connector body, and a continuous fifth threaded section is arranged on the outer wall of the connector body; the locknut set comprises a fastening nut and a locking nut, a fixed section is formed at one end of the fastening nut, a continuous first threaded section matched with the fifth threaded section is arranged on the inner wall of the fastening nut and the inner wall of the fixed section, a second threaded section is arranged on the outer diameter of the fixed section, a locking section is formed at one end of the locking nut, and the locking section is matched with the second threaded section. A third threaded section matched with the second threaded section is arranged on the inner wall of the locking section, and a fourth threaded section matched with the fifth threaded section is arranged on the inner wall of the locking nut; the fastening nut and the locking nut are in threaded connection through the second threaded section and the third threaded section, and the locking nut is in threaded connection with the fifth threaded section on the connector body through the fourth threaded section. The fastening nut and the locking nut are fixed in a detachable connection mode.

Description

Technical Field

[0001] The invention relates to the technical field of sealing joints, and in particular to an anti-loosening double-nut compression type quick-connect joint and a locking method for the quick-connect joint. Background Art

[0002] At present, the method used by quick connectors in the field of connection and fixation technology is a single nut thread fastening method and a rubber sealing ring sealing method, which can only play a simple fixed connection role. In the case of long-term use, leakage prevention and loosening prevention have always been difficult to overcome technical problems. Summary of the invention

[0003] To this end, an embodiment of the present invention provides a double-nut compression type quick-connect connector and a locking method for the quick-connect connector to solve the problems existing in the above-mentioned technology.

[0004] In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:

[0005] In a first aspect, a double-nut compression type quick-release connector is provided, comprising:

[0006] A joint body, wherein a continuous fifth thread segment is formed on an outer wall of the joint body;

[0007] A locknut group, the locknut group comprising a fastening nut and a locking nut, one end of the fastening nut protrudes outward along the axial direction to form a fixing section, the inner diameter of the fixing section is the same as the inner diameter of the fastening nut, and the inner walls of the fastening nut and the fixing section are provided with a continuous first thread section that matches the fifth thread section, the outer diameter of the fixing section is provided with a second thread section, one end of the locking nut is recessed inward to form a locking section, the outer diameter of the locking section is the same as the outer diameter of the locking nut, the inner diameter of the locking section is smaller than the inner diameter of the locking nut and the same as the outer diameter of the fixing section, the inner wall of the locking section is provided with a third thread section that matches the second thread section, and the inner wall of the locking nut is provided with a fourth thread section that matches the fifth thread section;

[0008] The fastening nut is threadedly connected to the locking nut via the second thread segment and the third thread segment, the fastening nut is threadedly connected to the fifth thread segment on the joint body via the first thread segment, and the locking nut is threadedly connected to the fifth thread segment on the joint body via the fourth thread segment.

[0009] Optionally, a reinforcement component is provided between the fastening nut and the joint body for locking the joint body.

[0010] Optionally, the reinforcement assembly includes a sealing ring, a gasket and an open ring. The open ring, gasket and sealing ring are arranged in sequence on the joint body along the screwing direction of the anti-loosening nut group. The open ring, sealing ring and gasket are fixed between the fastening nut and the joint body.

[0011] Optionally, the inner wall of the end portion of the fastening nut away from the fixed section protrudes inward to form a clamping portion, and the clamping portion is arranged as a conical structure whose inner diameter gradually increases from the fastening nut toward the fixed section. The open ring is arranged as a conical structure, and the maximum outer diameter of the open ring is greater than the minimum outer diameter of the clamping portion. The open ring, gasket and sealing ring are pressed and fixed on the joint body by the fastening nut.

[0012] Optionally, the fastening nut and the fixing section, the locking nut and the locking section are all made of stainless steel;

[0013] The fastening nut and the fixing section, as well as the locking nut and the locking section are all integrally formed.

[0014] Optionally, an outer side of the fastening nut and / or an outer side of the locking nut is provided with an arrow mark representing the direction in which the nut is screwed in.

[0015] Optionally, both the fastening nut and the locking nut are provided with alignment marks, and the positions corresponding to the two alignment marks are the locking positions of the nuts.

[0016] Optionally, the fastening nut and the locking nut are provided with pairing marks for pairing.

[0017] In a second aspect, a locking method for a quick connector is provided. The locking method is based on the above-mentioned anti-loosening double-nut compression type quick connector, and comprises the following steps:

[0018] S1, sequentially put the sealing ring, the gasket and the split ring on the joint body, and move the sealing ring, the gasket and the split ring to the fifth thread segment;

[0019] S2. Before installation, check whether the nuts of the anti-loosening nut set are in good condition, whether the arrow mark, alignment mark and matching mark are clear, and whether the fastening nut and the locking nut are tightly connected to prevent disassembly;

[0020] S3, keep the hexagonal alignment of the fastening nut and the locking nut, and align the alignment marks, align the locking nut side of the anti-loosening nut assembly with the joint body, and put the anti-loosening nut assembly on the joint body and move it to the fifth thread segment;

[0021] S4, use a torque wrench to tighten the anti-loosening nut group as a whole, and screw the fastening nut and the locking nut into the fifth thread segment on the connector body simultaneously until the anti-loosening nut group reaches the specified installation torque;

[0022] S5. With the fastening nut fixed, use a torque wrench to turn only the locking nut until the locking nut reaches the specified torque to complete the installation.

[0023] Optionally, in step S2, when the fastening nut and the locking nut are in use, they are kept connected via the fixing section and the locking section, and a gap is set between the fastening nut and the locking nut.

[0024] The present invention has at least the following beneficial effects:

[0025] The present invention provides an anti-loosening nut group, and the fastening nut and the locking nut of the anti-loosening nut group are threadedly connected through the second thread segment and the third thread segment to form a second friction surface. At the same time, the fastening nut and the locking nut are threadedly connected with the fifth thread segment of the joint body through the first thread segment and the fourth thread segment respectively to form a first friction surface. By screwing in the fastening nut and the locking nut, when impact and vibration loads act, the friction force of the first friction surface will decrease and disappear, but at the same time, the first nut will be compressed, causing the friction force of the second friction surface to further increase. The first friction force and the second friction force must be overcome to loosen the nut. Since the second friction force increases while the first friction force decreases, the anti-loosening effect can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly explain the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the embodiments of the present invention. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, other drawings can be derived from the provided drawings without creative work.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0028] Figure 1 A schematic diagram of a first viewing angle structure of an embodiment of the present invention;

[0029] Figure 2 A schematic structural diagram of a locking nut assembly from a second viewing angle according to an embodiment of the present invention;

[0030] Figure 3 A schematic structural diagram of a locking nut assembly from a third perspective according to an embodiment of the present invention;

[0031] Figure 4 It is a schematic cross-sectional structural diagram of an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of a structure from a fourth viewing angle of an embodiment of the present invention;

[0033] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the AA part.

[0034] Description of reference numerals:

[0035] 1. Connector body; 2. Anti-loosening nut assembly; 21. Fastening nut; 22. Fixing section; 23. Locking nut; 24. Locking section; 3. Reinforcement assembly; 31. Sealing ring; 32. Gasket; 33. Open ring; 4. Snap-fit ​​part; 5. Arrow mark; 6. Alignment mark. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] In the description of the present invention, unless otherwise specified, "plurality" means two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish the objects referred to. For schemes with a sequential flow, this terminology does not have to be understood as describing a specific order or sequence. For schemes with device structures, this terminology does not distinguish between importance, positional relationships, etc.

[0038] In addition, the terms "comprises", "has" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that have been explicitly listed, but may also include other steps or units that are not explicitly listed but are inherent to these processes, methods, products or apparatuses, or steps or units that are added based on further optimization schemes conceived by the present invention.

[0039] Example 1

[0040] like Figure 1-Figure 6 As shown, a double-nut compression type quick-release connector disclosed in the present invention includes:

[0041] A joint body 1, wherein a continuous fifth thread segment is formed on the outer wall of the joint body 1;

[0042] A locknut group 2, the locknut group 2 comprising a fastening nut 21 and a locking nut 23, one end of the fastening nut 21 protrudes outwardly along the axial direction to form a fixing section 22, the inner diameter of the fixing section 22 is the same as the inner diameter of the fastening nut, and the inner walls of the fastening nut and the fixing section 22 are provided with a continuous first thread section that matches the fifth thread section, the outer diameter of the fixing section 22 is provided with a second thread section, one end of the locking nut 23 is recessed inward to form a locking section 24, the outer diameter of the locking section 24 is the same as the outer diameter of the locking nut 23, the inner diameter of the locking section 24 is smaller than the inner diameter of the locking nut 23 and is the same as the outer diameter of the fixing section 22, the inner wall of the locking section 24 is provided with a third thread section that matches the second thread section, and the inner wall of the locking nut 23 is provided with a fourth thread section that matches the fifth thread section;

[0043] The fastening nut is threadedly connected to the locking nut 23 via the second thread segment and the third thread segment, the fastening nut is threadedly connected to the fifth thread segment on the joint body 1 via the first thread segment, and the locking nut 23 is threadedly connected to the fifth thread segment on the joint body 1 via the fourth thread segment.

[0044] In this embodiment, the joint body 1 can be a pipe such as a straight pipe or a three-way pipe;

[0045] The anti-loosening nut set 2 is a double nut structure, which is a parent-child nut structure of a fastening nut 21 and a locking nut 23. The fastening nut 21 and the locking nut 23 are threadedly connected, and the fastening nut 21 and the locking nut 23 are simultaneously threadedly connected to the joint body 1;

[0046] Specifically, the fastening nut 21 is composed of two parts, one part is the fastening nut 21 body (internal thread structure), and the other part is the fixing section 22 (which can be integrally formed) extending toward one side of the fastening nut 21. The fixing section 22 is provided with thread structures on both the inner and outer sides. The thread structure of the inner side wall of the fixing section 22 and the internal thread structure of the fastening nut 21 form a continuous first thread section. The external thread structure on the outer side of the fixing section 22 is the second thread section, and the outer diameter of the fixing section 22 is smaller than the outer diameter of the fastening nut 21. , forming a stepped structure; the locking nut 23 is also composed of two parts, one part is the locking nut 23 body (internal thread structure), and the other part is the locking section 24 (integrally formed) extending toward one side of the locking nut 23, the locking section 24 is also an internal thread structure, and the inner diameter of the locking section 24 is larger than the inner diameter of the locking nut 23, the inner diameter of the locking section 24 is adapted to the outer diameter of the fixing section 22, the thread structure of the inner wall of the locking section 24 is the third thread section, and the thread structure of the fastening nut 21 is the fourth thread section;

[0047] The fastening nut 21 is connected to the fifth thread segment on the joint body 1 through the first thread segment, the locking nut 23 is connected to the second thread segment of the fastening nut 21 through the third thread segment, and the locking nut 23 is connected to the fifth thread segment on the joint body 1 through the fourth thread segment;

[0048] During installation, the fastening nut 21 and the locking nut 23 need to rotate synchronously first. Therefore, the fastening nut 21 and the locking nut 23 need to be fixed by a detachable connection. In this embodiment, glue is used for fixing, which is convenient for separation. It should be noted that the fastening nut 21 and the locking nut 23 can also be fixed by other methods. They will not separate during the synchronous screwing process, and are convenient for separation during the locking process.

[0049] The locking principle between the above-mentioned fastening nut 21 and the locking nut 23 is as follows: two friction surfaces are generated between the fastening nut 21, the locking nut 23 and the joint body 1, the first friction surface is between the anti-loosening nut group 2 and the fastened part (joint body 1), and the second friction surface is between the fastening nut 21 and the locking nut 23. During installation, the preload force of the first friction surface is 80% of that of the second friction surface. When subjected to impact and vibration loads, the friction force of the first friction surface will decrease and disappear, but at the same time, the first nut will be compressed, causing the friction force of the second friction surface to further increase. The first friction force and the second friction force must be overcome for the nut to loosen, because the second friction force will increase while the first friction force decreases.

[0050] In a further embodiment, a reinforcement component 3 is provided between the fastening nut and the joint body 1 for locking the joint body 1 .

[0051] The reinforcement component 3 includes a sealing ring 31, a gasket 32 ​​and an open ring 33. The open ring 33, the gasket 32 ​​and the sealing ring 31 are arranged in sequence on the joint body 1 along the screwing direction of the anti-loosening nut group 2. The open ring 33, the sealing ring 31 and the gasket 32 ​​are fixed between the fastening nut and the joint body 1.

[0052] In a further embodiment, the sealing ring 31 may be made of non-metallic material, such as rubber; or metallic material, such as stainless steel;

[0053] The sealing ring 31 made of both metal and non-metal materials can achieve a sealing effect. Rubber is a conventional sealing ring material and is not described in detail here. When a non-metal material is used, the sealing ring 31 is less affected by the ambient temperature, thereby ensuring the sealing effect. In particular, the stainless steel material after heat treatment has particularly good high and low temperature resistance.

[0054] The inner wall of the end of the fastening nut on the side away from the fixed section 22 protrudes inward to form a clamping portion 4, and the clamping portion 4 is configured as a conical structure with an inner diameter gradually increasing from the fastening nut toward the fixed section 22. The open ring 33 is configured as a conical structure, and the maximum outer diameter of the open ring 33 is greater than the minimum outer diameter of the clamping portion 4. The open ring 33, the gasket 32 ​​and the sealing ring 31 are pressed and fixed on the joint body 1 by the fastening nut.

[0055] The fastening nut and the fixing section 22, the locking nut 23 and the locking section 24 are all made of stainless steel;

[0056] The fastening nut and the fixing section 22 , and the locking nut 23 and the locking section 24 are all formed in one piece.

[0057] In a further embodiment, an outer side of the fastening nut and / or an outer side of the locking nut 23 are provided with an arrow mark 5 representing the screw-in direction of the nut.

[0058] The fastening nut and the locking nut 23 are both provided with alignment marks 6, and the positions corresponding to the two alignment marks 6 are the locking positions of the nuts.

[0059] By setting arrow marks on the fastening nut 21 and / or the locking nut 23, it is convenient for construction personnel to determine the direction in which the nut is screwed in; according to different implementation scenarios, the rotation direction of the locking nut 23 during the locking process can be the same as the direction in which the fastening nut 21 is screwed in, or it can be opposite. At this time, arrows are set on both the fastening nut 21 and the locking nut 23. The arrow mark 5 on the fastening nut 21 represents the direction of synchronous screwing in, and the arrow mark 5 on the locking nut 23 represents the direction of rotation of the locking nut 23 when locking.

[0060] In addition, alignment marks 6 can be set on the side walls of the fastening nut 21 and the locking nut 23 according to needs, and the nuts are locked when the two alignment marks 6 are aligned;

[0061] In this embodiment, the alignment mark 6 adopts two V-shaped structures, and other shapes or methods can also be used for marking.

[0062] In this embodiment, the arrow mark 5 and the alignment mark 6 can be set by spray painting, engraving, etc.; in addition, a pairing mark (not shown in the figure) can also be set on the locking nut 23 and the fastening nut 21, and the same setting method (spray painting or engraving, etc.) can be adopted. The pairing mark can adopt mutually matching symbols, numbers or letters to pair the corresponding locking nuts 23 and fastening nuts 21. They are set at the factory, and each locking nut 23 is only adapted to the corresponding fastening nut 21, which is convenient for pairing after disassembly.

[0063] Example 2

[0064] A locking method, which is based on the above-mentioned anti-loosening double-nut compression type quick-release joint and the locking method of the quick-release joint, comprises the following steps:

[0065] S1, sequentially put the sealing ring 31, the gasket 32 ​​and the open ring 33 on the joint body 1, and move the sealing ring 31, the gasket 32 ​​and the open ring 33 to the fifth threaded section;

[0066] S2, before installation, check whether the appearance of the nuts of the anti-loosening nut set 2 is intact, whether the arrow mark 5 and the alignment mark 6 are clear, and whether the fastening nut and the locking nut 23 are tightly connected by glue to prevent disassembly;

[0067] S3, keep the fastening nut and the locking nut 23 aligned hexagonally, and align the alignment mark 6, align one side of the locking nut 23 of the anti-loosening nut set 2 with the joint body 1, and put the anti-loosening nut set 2 on the joint body 1 and move it to the fifth thread segment;

[0068] S4, using a torque wrench to tighten the anti-loosening nut set 2 as a whole, and the tightening nut and the locking nut 23 are simultaneously screwed into the fifth thread segment on the joint body 1 until the anti-loosening nut set 2 reaches the specified installation torque;

[0069] S5, with the fastening nut fixed, use a torque wrench to rotate only the locking nut 23 until the locking nut 23 reaches a specified torque, and the installation is completed.

[0070] When the fastening nut 21 and the locking nut 23 are in use, they are connected by the fixing section 22 and the locking section 24 , and there is a separation of 2-3 mm between the fastening nut 21 and the locking nut 23 .

[0071] The specific installation method is as follows: before installing the above-mentioned anti-loosening nut set 2, check whether the appearance of the nut is intact, whether the marking is clear, and whether the fastening nut 21 and the locking nut 23 are tightly connected (the threads are fixed with glue to prevent disassembly); in addition, there are V-shaped alignment marks on the corresponding surfaces of the fastening nut 21 and the locking nut 23;

[0072] Tools used: open-end wrench, torque wrench;

[0073] Before installing the anti-loosening nut set 2, the hexagonal alignment of the fastening nut 21 and the locking nut 23 and the V-shaped mark alignment should be maintained;

[0074] And tighten the main locking nut 23 by hand;

[0075] Use a torque wrench to tighten the locknut as a whole to confirm that the locknut reaches the specified installation torque;

[0076] With the fastening nut 21 fixed, the locking nut 23 is locked in a specified direction (the direction of the arrow mark 5 on the locking nut 23 ); and the installation is completed.

[0077] When disassembling:

[0078] Use a torque wrench to rotate the locking nut 23 clockwise (in the opposite direction of the arrow mark 5 on the locking nut 23) to restore the locking nut 23 to the position of the upper and lower marks (the upper and lower hexagons are aligned); (If the hexagons cannot be aligned up and down according to the mark, it will be difficult to loosen the fastening nut 21 and the locking nut 23 when the torque is loaded at the same time, and even multiple seizure phenomena may occur);

[0079] After the locking nut 23 is returned to its original position, a wrench is used to simultaneously rotate the anti-loosening nut (the fastening nut 21 and the locking nut 23) counterclockwise until the anti-loosening nut is threadedly separated from the joint body 1 .

[0080] It should be noted that the fastening nut 21 and the locking nut 23 in the anti-loosening nut must be used in pairs according to the factory state.

[0081] The above specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0082] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0083] The present invention is described in more detail through general description and specific embodiments. It should be noted that, without departing from the concept of the present invention, it is obvious that several variations and improvements can be made to these specific embodiments, which all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application shall be subject to the attached claims.

Claims

1. A double nut compression type quick-release connector, characterized in that: include: A joint body, wherein a continuous fifth thread segment is formed on an outer wall of the joint body; A locknut group, the locknut group comprising a fastening nut and a locking nut, one end of the fastening nut protrudes outward along the axial direction to form a fixing section, the inner diameter of the fixing section is the same as the inner diameter of the fastening nut, and the inner walls of the fastening nut and the fixing section are provided with a continuous first thread section that matches the fifth thread section, the outer diameter of the fixing section is provided with a second thread section, one end of the locking nut is recessed inward to form a locking section, the outer diameter of the locking section is the same as the outer diameter of the locking nut, the inner diameter of the locking section is smaller than the inner diameter of the locking nut and the same as the outer diameter of the fixing section, the inner wall of the locking section is provided with a third thread section that matches the second thread section, and the inner wall of the locking nut is provided with a fourth thread section that matches the fifth thread section; The fastening nut is threadedly connected to the locking nut via the second thread segment and the third thread segment, the fastening nut is threadedly connected to the fifth thread segment on the joint body via the first thread segment, and the locking nut is threadedly connected to the fifth thread segment on the joint body via the fourth thread segment.

2. The anti-loosening double-nut compression type quick-release connector according to claim 1, characterized in that: A reinforcement component is arranged between the fastening nut and the joint body for locking the joint body.

3. The anti-loosening double-nut compression type quick-release connector according to claim 2, characterized in that: The reinforcement component includes a sealing ring, a gasket and an open ring. The open ring, gasket and sealing ring are arranged in sequence on the joint body along the screw-in direction of the anti-loosening nut group. The open ring, sealing ring and gasket are fixed between the fastening nut and the joint body.

4. The anti-loosening double-nut compression type quick-release connector according to claim 3, characterized in that: The inner wall of the end of the fastening nut on the side away from the fixed section protrudes inward to form a clamping portion, and the clamping portion is arranged as a conical structure with an inner diameter gradually increasing from the fastening nut toward the fixed section. The open ring is arranged as a conical structure, and the maximum outer diameter of the open ring is greater than the minimum outer diameter of the clamping portion. The open ring, gasket and sealing ring are pressed and fixed on the joint body by the fastening nut.

5. The anti-loosening double-nut compression type quick-release connector according to claim 1, characterized in that: The fastening nut and the fixing section, the locking nut and the locking section are all made of stainless steel; The fastening nut and the fixing section, as well as the locking nut and the locking section are all integrally formed.

6. The anti-loosening double-nut compression type quick-release connector according to claim 1, characterized in that: The outer side of the fastening nut and / or the outer side of the locking nut is provided with an arrow mark representing the screw-in direction of the nut.

7. The anti-loosening double-nut compression type quick-release connector according to claim 6, characterized in that: The fastening nut and the locking nut are both provided with alignment marks, and the positions corresponding to the two alignment marks are the locking positions of the nuts.

8. The anti-loosening double-nut compression type quick-release connector according to claim 6, characterized in that: The fastening nut and the locking nut are provided with matching marks for matching.

9. A method for locking a quick connector, characterized in that: The locking method of the quick connector is based on a double-nut compression type quick connector for preventing loosening according to any one of claims 1 to 8, comprising the following steps: S1, sequentially put the sealing ring, the gasket and the split ring on the joint body, and move the sealing ring, the gasket and the split ring to the fifth thread segment; S2. Before installation, check whether the nuts of the anti-loosening nut set are in good condition, whether the arrow mark, alignment mark and matching mark are clear, and whether the fastening nut and the locking nut are tightly connected to prevent disassembly; S3, keep the hexagonal alignment of the fastening nut and the locking nut, and align the alignment marks, align the locking nut side of the anti-loosening nut assembly with the joint body, and put the anti-loosening nut assembly on the joint body and move it to the fifth thread segment; S4, use a torque wrench to tighten the anti-loosening nut group as a whole, and screw the fastening nut and the locking nut into the fifth thread segment on the connector body simultaneously until the anti-loosening nut group reaches the specified installation torque; S5. With the fastening nut fixed, use a torque wrench to turn only the locking nut until the locking nut reaches the specified torque to complete the installation.

10. A method for locking a quick connector according to claim 9, characterized in that: In S2, when the fastening nut and the locking nut are in use, they are kept connected by the fixing section and the locking section, and a gap is set between the fastening nut and the locking nut.

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