Nut fixing device

Abstract

The utility model provides a nut fixing device. The nut fixing device comprises a shell, a sleeve and a limiting structure. The shell is provided with a cavity; the at least one sleeve is located in the cavity, and a mounting space for containing the nut is formed in the sleeve; the limiting structure is arranged in the cavity, the limiting structure is adjacent to the sleeve, the limiting structure is provided with a connecting position at least partially connected with the sleeve, and the limiting structure is provided with a separating position separated from the sleeve; when the limiting structure is located at the connecting position, the sleeve is locked at the current position, and when the limiting structure is located at the separating position, the sleeve is movably arranged relative to at least one of the sleeve and the shell. By the adoption of the nut fixing device, the problems that in the prior art, when a bolt is used for fixing double nuts, double-hand operation is needed, so that safety risks are increased, operation is limited, and efficiency is low are solved.

Description

Technical Field

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

[0002] Bolts and nuts, as fundamental fasteners, are widely used to connect parts in numerous fields, including industry, construction, and automotive manufacturing. While traditional bolt-and-nut fastening methods can meet basic fastening needs, efficiency and safety pose significant challenges in actual operation, particularly with double nuts or in situations where space is limited and operation is difficult.

[0003] Currently, bolts are commonly used to connect two parts with through-holes. Bolts and nuts secure the connection through thread engagement, preload, and friction. However, tightening the bolts requires a separate wrench or torque tool to secure the nut and prevent it from rotating. This method requires two hands, posing safety risks, operational limitations, and efficiency issues.

[0004] To address the above issues, no effective solutions have been proposed so far. Utility Model Content

[0005] The main purpose of the utility model is to provide a nut fixing device to solve the problem of low efficiency caused by the need to manually fix the nut for bolt connection in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a nut fixing device is provided, including: a shell, the shell having a cavity; a sleeve, there is at least one sleeve, the sleeve is located in the cavity, and the interior of the sleeve forms an installation space for accommodating the nut; a limiting structure, the limiting structure is arranged in the cavity, the limiting structure is arranged adjacent to the sleeve, the limiting structure has a connection position at least partially connected to the sleeve, and the limiting structure has a separation position disconnected from the sleeve; wherein, when the limiting structure is in the connection position, the sleeve is locked at the current position, and when the limiting structure is in the separation position, the sleeve is movably arranged relative to at least one of the sleeve and the shell.

[0007] Furthermore, there are two sleeves, which are spaced apart along the first direction, and the limiting structure is provided between the two sleeves. When the limiting structure is in the connection position, the limiting structure is respectively connected to the two sleeves on both sides along the first direction.

[0008] Furthermore, the limiting structure is provided with a first matching portion on both sides along the first direction, and each sleeve is provided with a second matching portion on the side facing the limiting structure. The two first matching portions and the two second matching portions are provided in one-to-one correspondence. When the limiting structure is in the connection position, each first matching portion is connected to the corresponding second matching portion.

[0009] Furthermore, the first matching portion is a first tooth-shaped structure arranged on the side wall of the limiting structure, and the second matching portion is a second tooth-shaped structure arranged along the circumference of the sleeve. When the first tooth-shaped structure is engaged with the second tooth-shaped structure, the limiting structure is in a connected position, and when the first tooth-shaped structure is disengaged from the second tooth-shaped structure, the limiting structure is in a separated position.

[0010] Furthermore, the limiting structure is composed of two relatively arranged limiting splits, the two limiting splits are arranged corresponding to the two first matching parts, each first matching part is arranged on the outside of the corresponding limiting split, and a spring is connected between the two limiting splits so that the two limiting splits can be movably arranged relative to the sleeve, thereby driving the first matching part to move relative to the sleeve.

[0011] Furthermore, the nut fixing device also includes a driving mechanism, which includes: an operating pliers, the jaw end of the operating pliers extends to the interior of the limiting structure, the handle end of the operating pliers is away from the limiting structure, and each limiting split is provided with a clamping portion, the two clamping portions are arranged in a one-to-one correspondence with the two clamp heads at the jaw end, and each clamping portion abuts against the corresponding clamp head so that the operating handle end can cause the jaw end to contract or expand, thereby driving the two limiting splits to move relative to the corresponding sleeve.

[0012] Furthermore, the sleeve is connected to the sleeve fixing structure on the housing through a retaining spring.

[0013] Furthermore, a knurled handwheel is connected to the top of the sleeve, and operating the knurled handwheel can drive the sleeve to rotate around its own central axis.

[0014] Furthermore, an adsorption component is provided in the knurled handwheel, and when the nut is installed in the sleeve, the sleeve is magnetically connected to the nut through the adsorption component.

[0015] Furthermore, the adsorption member is a magnet.

[0016] The technical solution of this utility model locks the sleeve in place when the retaining structure is in the connected position, preventing the nut from rotating during tightening. Once the retaining structure moves to the disengaged position, the sleeve becomes relatively movable, allowing the angle and position of the sleeve to be adjusted to suit the tightening requirements of different nuts. The connection design between the sleeve and the retaining structure greatly simplifies the operation process and tool requirements, making it particularly suitable for use in tight spaces and difficult operations, significantly improving the safety and efficiency of tightening operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 FIG1 shows a structural schematic diagram of a first embodiment of a nut fixing device according to the present utility model;

[0019] Figure 2 FIG2 shows a structural schematic diagram of a second embodiment of a nut fixing device according to the present utility model;

[0020] Figure 3 FIG2 shows a structural schematic diagram of a third embodiment of a nut fixing device according to the present utility model;

[0021] Figure 4 A structural schematic diagram of a fourth embodiment of a nut fixing device according to the present utility model is shown.

[0022] The above drawings include the following reference numerals:

[0023] 1. Limiting structure;

[0024] 2. Handle end;

[0025] 20. Nut;

[0026] 21. Second tooth structure;

[0027] 22. Limit split;

[0028] 23. Pliers head;

[0029] 24. Clamping portion;

[0030] 4. Knurled handwheel;

[0031] 5. Sleeve;

[0032] 6. Shell;

[0033] 7. Ear seat. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0038] Combine Figures 1 to 4 As shown, according to a specific embodiment of the present application, a nut fixing device is provided.

[0039] Specifically, the nut fixing device includes: a housing 6, a sleeve 5, and a limiting structure 1. The housing 6 has a cavity; there is at least one sleeve 5, which is located in the cavity, and the interior of the sleeve 5 forms an installation space for accommodating the nut 20; the limiting structure 1 is disposed in the cavity, adjacent to the sleeve 5, and has a connection position in which it is at least partially connected to the sleeve 5, and a separation position in which it is disconnected from the sleeve 5. When the limiting structure 1 is in the connection position, the sleeve 5 is locked in its current position. When the limiting structure 1 is in the separation position, the sleeve 5 is movably disposed relative to at least one of the sleeve 5 and the housing 6.

[0040] The technical solution of this utility model locks the sleeve in place when the retaining structure is in the connected position, preventing the nut from rotating during tightening. Once the retaining structure moves to the disengaged position, the sleeve becomes relatively movable, allowing the angle and position of the sleeve to be adjusted to suit the tightening requirements of different nuts. The connection design between the sleeve and the retaining structure greatly simplifies the operation process and tool requirements, making it particularly suitable for use in tight spaces and difficult operations, significantly improving the safety and efficiency of tightening operations.

[0041] Specifically, if Figure 4 As shown, there are two sleeves 5, spaced apart along a first direction, which is the length of the nut fixing device. The two sleeves 5 are symmetrically arranged, and the limiting structure 1 is disposed between the two sleeves 5. When the limiting structure 1 is in the connected position, the limiting structure 1 locks with the two sleeves 5 on both sides along the first direction. When the limiting structure 1 is in the connected position, it contacts and locks with the two sleeves 5 on both sides along the first direction, thereby securing the sleeves 5. The design of the limiting structure 1 ensures that it can accurately contact the sleeves 5 and provides sufficient locking force to ensure that it will not slip during the tightening process.

[0042] Furthermore, the limiting structure 1 is provided with a first mating portion on both sides along the first direction, and each sleeve 5 is provided with a second mating portion on the side facing the limiting structure 1. The two first mating portions are provided in a one-to-one correspondence with the two second mating portions. When the limiting structure 1 is in the connected position, each first mating portion is connected to the corresponding second mating portion. This one-to-one correspondence between the first mating portion and the second mating portion ensures that the limiting structure 1 can accurately and stably lock with the two sleeves 5 when in the connected position, preventing them from rotating during the tightening process.

[0043] The limiting structure 1 is designed with first matching parts on both sides. These matching parts can be protrusions, grooves, locking pins, magnetic adsorption surfaces or any other form of mechanical or magnetic connection structure, which are used to form a match with the second matching part of the sleeve 5. In the connection position, the first matching part will penetrate into the second matching part, or achieve a tight connection with the second matching part through magnetic adsorption or other means, thereby locking the sleeve 5. Each sleeve 5 is provided with a second matching part on the side facing the limiting structure 1. It corresponds to the first matching part in shape, size and position, and is designed to be able to form a structure that can match with the first matching part, such as a groove, a locking hole, a magnetic adsorption surface, etc. When the limiting structure 1 moves to the connection position, the second matching part will match and lock with the first matching part, thereby fixing the sleeve 5.

[0044] In an exemplary embodiment, the first matching portion is a first tooth-shaped structure arranged on the side wall of the limiting structure 1, and the second matching portion is a second tooth-shaped structure 21 arranged along the circumference of the sleeve 5. When the first tooth-shaped structure is engaged with the second tooth-shaped structure 21, the limiting structure 1 is in a connected position, and when the first tooth-shaped structure is disengaged from the second tooth-shaped structure 21, the limiting structure 1 is in a separated position.

[0045] The connection and disconnection positions of the limiting structure 1 are controlled by the meshing and disengagement of the teeth between the first toothed structure 1 and the second toothed structures 21 of the two sleeves 5. In the connected position, the first toothed structure and the second toothed structure 21 are fully meshed, forming a high-strength, high-precision mechanical locking method, which enables the limiting structure 1 to fix the two sleeves 5 and ensure that the sleeves 5 will not rotate due to external forces. In the disconnected position, the first toothed structure and the second toothed structure 21 are disengaged, and the constraints of the limiting structure 1 are released, allowing the sleeves 5 to rotate or move freely within a certain range, making it easier for the operator to adjust the position of the sleeves 5.

[0046] like Figure 3 As shown, the first tooth-shaped structure is arranged on the side wall of the limiting structure 1 facing the sleeve 5, the first tooth-shaped structure and the second tooth-shaped structure are arranged in a one-to-one correspondence, and the second tooth-shaped structure 21 is arranged along the circumference of the sleeve 5 to ensure that no matter how the position of the sleeve 5 is adjusted, the first tooth-shaped structure and the second tooth-shaped structure 21 can be engaged with each other when the limiting structure 1 is in the connection position, thereby playing the role of tightening the sleeve 5.

[0047] Specifically, the limiting structure 1 is composed of two relatively arranged limiting sub-bodies 22. The two limiting sub-bodies 22 are arranged corresponding to the two first matching parts. Each first matching part is arranged on the outside of the corresponding limiting sub-bodies 22. A spring is connected between the two limiting sub-bodies 22 so that the two limiting sub-bodies 22 can be movably arranged relative to the sleeve 5, thereby driving the first matching parts to move relative to the sleeve 5. Through the cooperation between the two relatively arranged limiting sub-bodies 22 and the spring, dynamic locking and release of the sleeve 5 is achieved. The structure of the spring can be designed as a compression spring with a hook and loop structure at both ends. The design of the hook and loop structure makes the connection between the spring and the limiting structure 1 more stable, avoids the spring from falling off during use, and improves the reliability and service life of the tool.

[0048] like Figure 4 As shown, the two limiting sub-bodies 22 are spaced apart along the first direction. The first matching portion and the limiting sub-bodies 22 are an integral structure. The first matching portion is arranged on the outside of the limiting sub-bodies 22. The main function of the limiting sub-bodies 22 is to form an engagement with the second matching portion on the sleeve 5 through the first matching portion when in the connected position, thereby fixing the sleeve. The two limiting sub-bodies 22 are connected by a spring. This design allows the limiting sub-bodies 22 to move relative to the sleeve 5. When the spring is in a natural state, the limiting sub-bodies 22 tightly engage with the second matching portion on the sleeve 5 through the first matching portion, fixing the sleeve 5; when the spring is compressed, the limiting sub-bodies 22 move away from the sleeve 5, the first matching portion and the second matching portion disengage, and the sleeve 5 can move freely, facilitating adjustment of the angle and position. The elastic force of the spring also ensures that the limiting sub-bodies 22 can automatically return to the state of fixing the sleeve 5 in the absence of external force, providing an automatic reset mechanism.

[0049] Specifically, the nut fixing device also includes a driving mechanism, which includes: an operating pliers, the jaw end of the operating pliers extends to the interior of the limiting structure 1, the handle end 2 of the operating pliers is away from the limiting structure 1, and each limiting split 22 is provided with a clamping portion 24, and the two clamping portions 24 are arranged in a one-to-one correspondence with the two clamp heads 23 at the jaw end. Each clamping portion 24 abuts against the corresponding clamp head 23, so that the operating handle end 2 can cause the jaw end to contract or expand, thereby driving the two limiting splits 22 to move relative to the corresponding sleeve 5. The precise matching of the clamp head 23 and the clamping portion 24 enables the operator to finely control the movement of the limiting split 22, ensuring the precise engagement of the first matching portion with the second matching portion, thereby improving the accuracy and reliability of the fixation.

[0050] like Figure 4 As shown, the operating pliers in the driving mechanism are designed with a jaw end and a handle end 2. The jaw end extends into the interior of the limiting structure 1, while the handle end 2 is located outside the limiting structure 1 for easy gripping by the operator. The jaw end is designed with two pliers heads 23, which can be controlled by the handle end 2 to achieve contraction or expansion movement. Each limiting sub-body 22 is provided with a clamping portion 24, which is arranged near the upper end of the limiting sub-body 22. These clamping portions 24 are arranged in a one-to-one correspondence with the two pliers heads 23 at the jaw end. When the handle end 2 is squeezed to cause the pliers heads 23 to contract, they will abut against the clamping portions 24, forcing the limiting sub-body 22 to move away from the sleeve 5, disengaging the first and second mating portions, and allowing the sleeve 5 to move freely, facilitating angle and position adjustment. Conversely, when the operating handle end 2 causes the pliers heads 23 to expand, the force acting on the clamping portions 24 is reduced, and the limiting sub-body 22 automatically returns to a state fixed to the sleeve 5 under the action of the spring. The pliers head 23 of the operating pliers and the clamping part 24 on the limiting split 22 form a linkage mechanism. Through the operation of the handle end 2, the movement of the limiting split 22 can be accurately controlled, thereby driving the first matching part and the second matching part on the sleeve 5 to engage and disengage, thereby fixing and releasing the sleeve.

[0051] Specifically, the sleeve 5 is connected to the sleeve fixing structure on the housing 6 via a retaining spring. The purpose of this arrangement is to ensure that the sleeve 5 can be stably positioned within the housing 6, and to maintain the stability of the sleeve 5 even during high-intensity tightening operations, thereby preventing displacement or loosening due to vibration or external forces, while also allowing for easy removal and replacement.

[0052] A circlip is a common elastic fastener with two or more spring legs. In this solution, to install the sleeve 5, first place the sleeve 5 in the designated position within the housing 6, then align the spring legs of the circlip with the sleeve's mounting structure on the housing 6. Leveraging the spring's elasticity, the spring legs are pressed into the mounting point, causing the circlip to automatically spring back, with its slot or protrusion engaging the groove or locking pin of the sleeve's mounting structure, creating a mechanical lock and securing the sleeve 5. To remove the sleeve 5, simply apply a sufficient amount of external force to disengage the slot or protrusion from the mounting point, allowing easy removal.

[0053] Specifically, the top of the sleeve 5 is connected to a knurled handwheel 4, which can be operated to drive the sleeve 5 to rotate around its own central axis. By rotating the knurled handwheel 4, the sleeve 5 can be driven to rotate around its own central axis as the rotation axis, thereby positioning the sleeve 5 in a suitable position.

[0054] In this embodiment, the outer edge of the knurled handwheel 4 is knurled, with intersecting or parallel stripes. This design increases friction between the knurled handwheel 4 and the operator's palm, ensuring a secure grip and preventing slippage. A drive mechanism may be incorporated into the knurled handwheel 4, enabling mechanical linkage with the sleeve 5. This drive mechanism is typically implemented through a key connection, spline connection, or internal gearing, ensuring that rotation of the knurled handwheel 4 is directly converted into rotational motion of the sleeve 5.

[0055] Furthermore, if Figure 4 As shown, the knurled handwheel 4 is provided with an adsorption member. When the nut 20 is installed in the sleeve 5, the sleeve 5 forms a magnetic connection with the nut 20 through the adsorption member. The adsorption member provided in the knurled handwheel 4 forms a magnetic connection with the surface of the nut 20. This magnetic connection effectively prevents the nut 20 from rotating or sliding during the tightening process, improving the stability and success rate of the tightening operation. The inner wall of the sleeve 5 and the connection with the nut 20 can be provided with anti-slip grooves. The provision of anti-slip grooves increases the friction between the sleeve 5 and the nut 20, further ensuring the fixation of the nut 20.

[0056] Specifically, the adsorption part is a magnet, and the shape of the magnet can be set to be cylindrical. The magnet can be fixed to the nut 20 in a non-contact manner through magnetic adsorption, which means that when tightening the nut 20, the nut 20 can be stably held in the correct position of the sleeve 5 by the magnet without physical contact, avoiding damage to the nut surface that may be caused by contact friction.

[0057] When tightening the bolt, the magnet's attraction reduces relative movement between the nut 20 and the sleeve 5, thereby alleviating uneven tightening force caused by vibration. Even in the case of incomplete alignment, the magnet helps the nut 20 automatically find the optimal alignment position, reducing operational difficulty and time. Furthermore, as a standard industrial component, magnets are relatively low-cost and easy to maintain, requiring no additional wear and maintenance. Compared to complex mechanical or hydraulic locking devices, using magnets as an attraction element significantly reduces manufacturing and maintenance costs.

[0058] It should be further explained that if Figure 1 、 Figure 2 As shown, the nut fixing device also includes an ear seat 7, which is located above the housing 6. The ear seat 7 serves as an intermediate connector, firmly connecting the handle end 2 of the operating pliers to the housing 6. During the process of tightening the nut 20, the torque applied by the operator through the handle end 2 is transmitted to the housing 6 through the ear seat 7, and then acts on the internal sleeve 5 and nut 20. The connection between the ear seat 7 and the handle end 2 ensures that the handle end 2 can be firmly fixed to the ear seat 7 when the operator uses the knurled handwheel 4 or performs tightening operations, and will not slip or disengage due to excessive operating force, thereby improving operational safety.

[0059] In this embodiment, the main body of the ear seat 7 is designed with two "ear"-shaped structures, which are spaced apart along the second direction, which is the width direction of the nut fixing device. These structures are mainly used to install and fix the handle end 2. Each "ear" is provided with a connecting hole, which is used for the passage of bolts or pins to connect and fix the handle end 2 to the ear seat 7, avoiding unnecessary offset between the handle end 2 and the shell 6, thereby affecting the accuracy and stability of the fastening operation. In order to increase the structural strength and stability of the ear seat 7, reinforcing ribs may be designed inside the ear seat 7. The reinforcing ribs can be "X"-shaped, "Y"-shaped or in a grid form. They enhance the torsional and bending resistance of the ear seat 7, ensuring that the ear seat 7 will not be deformed or damaged during high-intensity fastening operations.

[0060] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0061] 1. The handle controls the pliers head to contract or expand, driving the two limiting members 22 to move relative to the corresponding sleeve 5, thereby engaging and disengaging the first mating portion of the limiting structure with the second mating portion on the sleeve 5, thereby securing and releasing the sleeve and nut. Once the sleeve secures the nut, the nut can be tightened with one hand. The connection design between the sleeve and the limiting structure greatly simplifies the operation process and tool requirements, making it particularly suitable for use in confined spaces and difficult operations, significantly improving the safety and efficiency of tightening operations.

[0062] 2. The knurled handwheel provides an easy-to-grip rotary interface, allowing users to adjust the socket angle and position to precisely align with the nut shape. The built-in magnet design allows the tool to be firmly attached to the nut surface and maintain its position even when the grip is released, greatly simplifying the operation process.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0064] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as being included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also fall within the scope of the present invention.

[0065] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A nut fixing device, characterized in that: include: A housing (6), wherein the housing (6) has a cavity; a sleeve (5), wherein there is at least one sleeve (5), the sleeve (5) is located in the cavity, and the interior of the sleeve (5) forms an installation space for accommodating the nut (20); a limiting structure (1), the limiting structure (1) being arranged in the cavity, the limiting structure (1) being arranged adjacent to the sleeve (5), the limiting structure (1) having a connection position at least partially connected to the sleeve (5), and the limiting structure (1) having a separation position disconnected from the sleeve (5); When the limiting structure (1) is located at the connection position, the sleeve (5) is locked at the current position; when the limiting structure (1) is located at the separation position, the sleeve (5) is movably arranged relative to at least one of the sleeve (5) and the housing (6).

2. The nut fixing device according to claim 1, characterized in that: There are two sleeves (5), and the two sleeves (5) are spaced apart along a first direction. The limiting structure (1) is arranged between the two sleeves (5). When the limiting structure (1) is located at the connection position, the limiting structure (1) is locked with the two sleeves (5) on both sides along the first direction.

3. The nut fixing device according to claim 2, characterized in that: The limiting structure (1) is provided with first matching parts on both sides along the first direction, and each sleeve (5) is provided with a second matching part on the side facing the limiting structure (1). The two first matching parts and the two second matching parts are provided in a one-to-one correspondence. When the limiting structure (1) is located in the connection position, each first matching part is connected to the corresponding second matching part.

4. The nut fixing device according to claim 3, characterized in that: The first matching portion is a first tooth-shaped structure arranged on the side wall of the limiting structure (1), and the second matching portion is a second tooth-shaped structure (21) arranged along the circumference of the sleeve (5). When the first tooth-shaped structure is engaged with the second tooth-shaped structure (21), the limiting structure (1) is in the connected position, and when the first tooth-shaped structure is disengaged from the second tooth-shaped structure (21), the limiting structure (1) is in the separated position.

5. The nut fixing device according to claim 3 or 4, characterized in that: The limiting structure (1) is composed of two relatively arranged limiting sub-bodies (22), the two limiting sub-bodies (22) are arranged corresponding to the two first matching parts, and each first matching part is arranged on the outer side of the corresponding limiting sub-bodies (22). A spring is connected between the two limiting sub-bodies (22) so that the two limiting sub-bodies (22) can be movably arranged relative to the sleeve (5), thereby driving the first matching part to move relative to the sleeve (5).

6. The nut fixing device according to claim 5, characterized in that: The nut fixing device further includes a driving mechanism, and the driving mechanism includes: An operating pliers, wherein the jaw end of the operating pliers extends to the interior of the limiting structure (1), and the handle end (2) of the operating pliers is away from the limiting structure (1). Each limiting split body (22) is provided with a clamping portion (24), and the two clamping portions (24) are provided in a one-to-one correspondence with the two clamp heads (23) of the jaw end. Each clamping portion (24) abuts against the corresponding clamp head (23), so that operating the handle end (2) can cause the jaw end to contract or expand, thereby driving the two limiting split bodies (22) to move relative to the corresponding sleeve (5).

7. The nut fixing device according to claim 1, characterized in that: The sleeve (5) is connected to the sleeve fixing structure on the housing (6) via a clamping spring.

8. The nut fixing device according to claim 1, characterized in that: The top of the sleeve (5) is connected to a knurled hand wheel (4), and the operation of the knurled hand wheel (4) can drive the sleeve (5) to rotate around its own central axis.

9. The nut fixing device according to claim 8, characterized in that: An adsorption component is provided in the knurled handwheel (4), and when the nut (20) is mounted on the sleeve (5), the sleeve (5) is magnetically connected to the nut (20) via the adsorption component.

10. The nut fixing device according to claim 9, characterized in that: The adsorption member is a magnet.

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