Fastener calibration device

Abstract

The invention discloses a fastener calibration device, and relates to the technical field of mechanical equipment. The fastener calibration device comprises a wrench, a sleeve, a clamping assembly and a jacking assembly. The non-working end of the sleeve is arranged on the connecting column corresponding to the wrench in a sleeving mode. The clamping assembly is arranged on the side wall of the sleeve; the jacking assembly comprises a connecting piece and a jacking piece, the connecting piece is assembled and connected with the clamping assembly, and the jacking piece is located on the side face, away from the sleeve, of the wrench; the jacking assembly can drive the jacking piece to get close to the clamping assembly, and therefore the wrench and the sleeve are driven to be in fastening fit. According to the fastener calibration device provided by the invention, the wrench and the sleeve are fastened and assembled by utilizing the clamping assembly and the jacking assembly, so that the sleeve and the wrench are prevented from being separated from each other when a high-torque fastener is rotationally calibrated, the safety in the working process is ensured, and the calibration efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of mechanical equipment technology, and in particular to a fastener calibration device. Background Technology

[0002] In mechanical assembly and maintenance, the rotational calibration of fasteners is a common and important operation. When performing this calibration, a wrench and a socket are typically used in conjunction. Specifically, the socket has two ends; the non-working end fits onto a specially designed mating post on the wrench. This mating method allows the force generated when the wrench rotates to be transmitted to the socket, thereby rotating the fastener and achieving the calibration.

[0003] However, in practical scenarios, when faced with situations requiring the rotational calibration of fasteners with significant torque, the torque experienced by the socket also increases accordingly during rotation due to the large torque of the fastener. When the torque exceeds the limit that the socket and the wrench's mating post can withstand, the socket can easily disengage from the wrench. Once this disengagement occurs, it not only interrupts the ongoing calibration work, affecting the continuity of the work, but more importantly, the disengaged socket may fly around due to inertia, posing a threat to the personal safety of the operator and creating a safety hazard.

[0004] To address this issue, a common practice is to add a step of holding the socket. The operator needs to hold the socket to prevent it from detaching from the wrench when subjected to high torque. However, this method has significant drawbacks. The operator must simultaneously operate the wrench to apply torque and hold the socket, making coordination difficult and resulting in a challenging operation. Furthermore, this complex method can distract the operator, reducing accuracy and speed, ultimately leading to low work efficiency. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to overcome the shortcomings of related technologies, and the present invention provides a fastener calibration device.

[0006] This invention provides the following technical solution: A fastener calibration device includes a wrench, a socket, a clamping assembly, and a tightening assembly.

[0007] The non-working end of the socket is sleeved on the corresponding connecting post of the wrench; the clamping assembly is installed on the side wall of the socket; the tightening assembly includes a connecting member and a tightening member, the connecting member is assembled and connected to the clamping assembly, and the tightening member is located on the side of the wrench away from the socket; the tightening assembly can drive the tightening member to move closer to the clamping assembly, thereby driving the wrench to perform a tight fit with the socket.

[0008] As a further improvement to the above technical solution, the clamping assembly includes a clamping seat, the clamping seat is provided with a clamping part, the clamping part is assembled and connected to the side wall of the sleeve, and the clamping seat is assembled and connected to the connecting member.

[0009] As a further improvement to the above technical solution, two clamping seats are symmetrically provided, and clamping pieces are provided at the opposite ends of the two clamping seats. The two opposite clamping pieces are located on opposite sides of the sleeve and are assembled and connected by fasteners to clamp the sleeve. The two clamping pieces are used to jointly form the clamping part.

[0010] As a further improvement to the above technical solution, the clamping piece is an arc surface that is recessed in the direction away from the sleeve, and the fixing member is a clamp. The clamp is sleeved on the periphery of the two clamping pieces to drive the two clamping pieces to clamp and fix the sleeve.

[0011] As a further improvement to the above technical solution, the opposite sides of the two clamping pieces are provided with limiting holes corresponding to the clamps, and the clamps are sequentially passed through the two limiting holes.

[0012] As a further improvement to the above technical solution, the tightening assembly further includes a support base and a driving member. The driving member is mounted on the support base, and the connecting member is rod-shaped. One end of the connecting member is assembled and connected to one of the clamping seats, and the other end of the connecting member is assembled and connected to the support base. The connecting member passes through the tightening member, and the tightening member is located between the support base and the wrench. The driving member can drive the tightening member to move closer to the end face of the wrench away from the sleeve.

[0013] As a further improvement to the above technical solution, two connectors are provided, corresponding to the two clamping seats, and the axes of the two connectors are parallel to the axis of the sleeve.

[0014] As a further improvement to the above technical solution, the support base, the clamping member and one of the connecting members are all provided with openings on the side of the through hole, and the side of the connecting member is provided with a limiting groove corresponding to the through hole with an opening on the support base.

[0015] As a further improvement to the above technical solution, the driving member is rod-shaped, and the driving member passes through the support seat by means of threaded engagement and presses against the tightening member. The axis of the driving member coincides with the axis of the sleeve.

[0016] As a further improvement to the above technical solution, the end face of the clamping member near the driving member is provided with an abutment groove.

[0017] Compared with related technologies, the advantages of this invention are: The fastener calibration device provided by this invention is specifically designed for the rotation calibration needs of fasteners with large torques. In actual operation, when rotation calibration of such fasteners with large torques is required, the operator must follow specific procedures.

[0018] First, fit the non-working end of the socket onto the corresponding connecting post of the wrench. This step requires ensuring accurate positioning of the socket and the wrench connecting post to guarantee smooth operation afterwards. The non-working end of the socket is usually designed with a hole diameter or structure that matches the wrench connecting post, allowing it to fit securely onto the connecting post and providing a basis for subsequent tightening. Next, install the clamping assembly onto the side wall of the socket.

[0019] After completing the above two steps, the clamping member of the tightening assembly, connected to the clamping assembly via a connector, is moved towards the side of the wrench facing away from the socket, applying pressure to that side. During this movement, the clamping member, through the cooperation of the connector and the clamping assembly, gradually applies pressure, thereby forcing the wrench and socket into a tight fit. When the clamping member reaches the appropriate position, a fixed connection is formed between the wrench and socket. This fixed connection can withstand a large torque, ensuring that the socket and wrench will not easily disengage during subsequent operations on high-torque fasteners.

[0020] At this point, the wrench and socket have formed a secure, fixed connection. The operator can then grip the wrench handle and apply force through the handle to engage the working end of the socket with the fastener. The working end of the socket is typically designed with a shape and size that matches the fastener, allowing it to fit precisely onto the fastener. Then, the operator performs a rotational calibration operation on the high-torque fastener according to the calibration requirements.

[0021] The aforementioned calibration process for high-torque fasteners offers numerous advantages. From an operational perspective, the entire process is clearly defined and convenient, allowing operators to quickly learn and complete the calibration. In terms of efficiency, the seamless integration of each step eliminates the need for complex adjustments and repetitive operations, enabling highly efficient calibration. Furthermore, the combined action of the clamping and tightening components effectively prevents the socket and wrench from disengaging during operation, ensuring safety. Moreover, the stable connection and efficient operation further enhance calibration efficiency, meeting the demands of high-torque fastener calibration in actual production.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This diagram shows a schematic view of the fastener calibration device in one embodiment of the present invention. Figure 2 A partial structural schematic diagram of a fastener calibration device according to one embodiment of the present invention is shown.

[0025] Explanation of key component symbols: 100-Wrench; 200-Socket; 300-Clamping assembly; 310-Clamping seat; 320-Clamping piece; 321-Limiting hole; 330-Clamping clamp; 400-Tightening assembly; 410-Connector; 411-Limiting groove; 420-Tightening component; 421-Abutting groove; 430-Support seat; 440-Drive component. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] Combination Figure 1 , Figure 2 As shown, an embodiment of the present invention provides a fastener calibration device, including a wrench 100, a sleeve 200, a clamping assembly 300, and a tightening assembly 400.

[0032] The non-working end of the sleeve 200 is sleeved on the corresponding connecting post of the wrench 100; the clamping assembly 300 is mounted on the side wall of the sleeve 200; the tightening assembly 400 includes a connector 410 and a tightening member 420, the connector 410 is assembled and connected to the clamping assembly 300, and the tightening member 420 is located on the side of the wrench 100 away from the sleeve 200; the tightening assembly 400 can drive the tightening member 420 to move closer to the clamping assembly 300, thereby driving the wrench 100 and the sleeve 200 to be fastened together.

[0033] In actual operation, when it is necessary to perform rotational calibration on fasteners with large torque, the operator of the fastener calibration device provided in this embodiment needs to follow specific steps.

[0034] First, the non-working end of the socket 200 is fitted onto the corresponding connecting post of the wrench 100. This step requires ensuring that the socket 200 and the connecting post of the wrench 100 are accurately positioned to guarantee smooth subsequent operations. The non-working end of the socket 200 is typically designed with a hole diameter or structure that matches the connecting post of the wrench 100, allowing it to fit securely onto the connecting post and providing a foundation for subsequent tightening. Next, the clamping assembly 300 is installed on the side wall of the socket 200.

[0035] After completing the above two steps, the clamping member 420 of the clamping assembly 400, which is connected to the clamping assembly 300 via the connector 410, is moved towards the side of the wrench 100 away from the socket 200, and pressure is applied to that side. During the movement, the clamping member 420 gradually applies pressure through the cooperation of the connector 410 and the clamping assembly 300, thereby driving the wrench 100 and the socket 200 to form a tight fit. When the clamping member 420 is pressed to the appropriate position, a fixed connection is formed between the wrench 100 and the socket 200. This fixed connection can withstand a large torque, ensuring that the socket 200 and the wrench 100 will not easily disengage when operating high-torque fasteners in the future.

[0036] At this point, the wrench 100 and socket 200 have formed a stable and fixed connection. The operator can then hold the handle of the wrench 100 and apply force through the handle to drive the working end of the socket 200 to engage with the fastener. The working end of the socket 200 is typically designed with a shape and size that matches the fastener, allowing it to fit accurately onto the fastener. Then, the operator performs a rotational calibration operation on the high-torque fastener according to the calibration requirements.

[0037] In some specific embodiments, the clamping assembly 300 includes a clamping seat 310, which has a clamping part. The clamping part is assembled and connected to the side wall of the sleeve 200, and the clamping seat 310 is assembled and connected to the connecting member 410. Through the clamping and fixing fit between the clamping part and the sleeve 200, sufficiently large frictional force and clamping force can be generated. This tight fit effectively ensures the reliability of the fixed connection between the clamping assembly 300 and the sleeve 200. In actual operation, when calibrating fasteners with high torque, the device will withstand significant forces. The reliable fixed connection between the clamping assembly 300 and the sleeve 200 ensures the stability of the entire device, preventing loosening or separation of components due to force. This ensures the reliability of this embodiment and allows the entire fastener calibration device to safely and stably complete the calibration task.

[0038] In some specific embodiments, two clamping seats 310 are symmetrically arranged, and clamping pieces 320 are provided at opposite ends of the two clamping seats 310. The two opposing clamping pieces 320 are located on opposite sides of the sleeve 200 and are assembled and connected by fasteners to clamp the sleeve 200. The two clamping pieces 320 together form the clamping part; this design has many advantages. On the one hand, by cooperating with the sleeve 200 through the two opposing clamping pieces 320, the operator can quickly assemble and disassemble the clamping assembly 300 according to actual needs. When it is necessary to perform calibration operations on fasteners of different sizes or types, it may be necessary to replace the sleeve 200 with a different size. At this time, it is only necessary to quickly disassemble and reassemble the clamping assembly 300 to fix the new sleeve 200 on the device, which greatly saves operation time and ensures efficiency.

[0039] On the other hand, this design also facilitates the adaptation to a wider range of sleeves 200 of different sizes. Since the spacing between the clamping plates 320 can be changed by adjusting the tightness of the fasteners or by selecting different specifications of the clamping plates 320, it can accommodate sleeves 200 of different diameters or sizes. This makes the fastener calibration device of this embodiment have a wider range of applications, enabling it to function in more diverse working scenarios and needs, thus improving the practicality and economy of the device.

[0040] In some specific embodiments, the clamping piece 320 is an arc-shaped surface recessed away from the sleeve 200. From a mechanical perspective, the arc-shaped surface can form a more closely fitting contact with the cylindrical sidewall of the sleeve 200. When the clamping piece 320 clamps the sleeve 200, the arc-shaped surface can evenly distribute the clamping force, avoiding localized stress concentration. Compared to flat or other irregularly shaped clamping surfaces, the arc-shaped surface can provide greater and more uniform friction, thereby ensuring a more reliable clamping fit on the sleeve 200. In actual operation, even if the device is subjected to a large torque, the clamping piece 320 can firmly fix the sleeve 200, preventing the sleeve 200 from loosening or shifting, and providing stable support for subsequent calibration operations of the fasteners. The fixing component is a clamp 330. The clamp 330 is a common connecting and fixing component with advantages such as simple structure, convenient operation, and strong connection. In this embodiment, the clamp 330 is sleeved around the periphery of the two clamping pieces 320. During assembly, the operator only needs to accurately place the clamp 330 around the periphery of the two clamping pieces 320, and then gradually tighten the clamp 330 by tightening the adjusting device on the clamp 330, such as a bolt, nut, or buckle. As the clamp 330 tightens, it applies an inward pressure to the two clamping pieces 320, which drives the two clamping pieces 320 to move closer together, thereby tightly clamping the sleeve 200 and achieving clamping and fixing of the sleeve 200.

[0041] This design, which uses clamps 330 as fasteners, is not only easy to operate, allowing for quick fixing and loosening of the clamping plates 320 and facilitating the replacement and adjustment of sleeves 200 of different sizes; but also features high connection strength of clamps 330, which can withstand greater external forces, ensuring that the clamping plates 320 maintain stable clamping of the sleeves 200 during device operation, further improving the reliability and safety of the entire device.

[0042] In some specific embodiments, the opposing sides of the two clamping plates 320 are provided with limiting holes 321 corresponding to the clamp 330. The clamp 330 passes through the two limiting holes 321 in sequence. This design has significant advantages, as it can effectively prevent the clamp 330 from detaching from the clamping plates 320 due to external forces. In actual working scenarios, the device may be subjected to various external forces, such as the operator accidentally bumping into the clamp 330 during operation, or vibrations generated during device operation. Without the constraint of the limiting holes 321, the clamp 330 may gradually loosen or even detach from the clamping plates 320 under the action of these external forces. Once the clamp 330 detaches, the clamping and fixing effect of the clamping plates 320 on the sleeve 200 will immediately fail, and the sleeve 200 may become loose or shifted, thereby affecting the normal operation of the entire fastener calibration device, and may even lead to calibration failure or safety accidents.

[0043] By setting a limiting hole 321 and allowing the clamp 330 to pass through it, the connection stability between the clamp 330 and the clamping piece 320 is greatly enhanced. Even under certain external forces, the clamp 330 can remain in a suitable position under the restriction of the limiting hole 321, and continue to play a fixing role on the clamping piece 320. This ensures that the clamping piece 320 can stably clamp the sleeve 200, guaranteeing the reliability of this embodiment and enabling the fastener calibration device to stably and accurately complete the calibration task under various working environments.

[0044] In some specific embodiments, the tightening assembly 400 further includes a support base 430 and a driving member 440. The driving member 440 is mounted on the support base 430. The connecting member 410 is rod-shaped, with one end connected to one of the clamping seats 310 and the other end connected to the support base 430. The connecting member 410 passes through the tightening member 420, which is located between the support base 430 and the wrench 100. During operation, the driving member 440 generates power to drive the tightening member 420 towards the end face of the wrench 100 away from the socket 200. As the tightening member 420 gradually approaches, it applies a tightening force towards the socket 200 to the wrench 100. This tightening force is transmitted to the socket 200 through the wrench 100, forming a tight fit between the wrench 100 and the socket 200. When fastener calibration is required, this tightening fit ensures that the wrench 100 acts stably on the socket 200, thereby accurately applying torque and completing the calibration task. Through this design, the tightening assembly 400 can effectively control the tightness between the wrench 100 and the socket 200, improving the accuracy and reliability of the calibration.

[0045] In some specific embodiments, two connectors 410 are provided, corresponding to the two clamping seats 310. The axes of both connectors 410 are parallel to the axis of the sleeve 200. During the operation of the clamping assembly 400, the sleeve 200 is the core component, and its axial direction is the main direction of force transmission. When the axis of the connector 410 is parallel to the axis of the sleeve 200, the force transmitted by the connector 410 can act accurately along the axial direction of the sleeve 200, reducing force deviation and loss. For example, when the driving member 440 drives the clamping member 420 to apply a clamping force to the wrench 100, this force will be transmitted to the clamping seat 310 through the connector 410, and then acted on the sleeve 200 by the clamping seat 310. If the axis of connector 410 is not parallel to the axis of sleeve 200, a component force will be generated during the transmission process, causing some force to be unable to effectively act on sleeve 200, thereby affecting the fastening effect between wrench 100 and sleeve 200, and may even cause the entire device to shake or shift during operation.

[0046] The design that the axes of the two connecting parts 410 are parallel to the axis of the sleeve 200 ensures a reliable connection between the support base 430 and the clamping base 310. When the device is subjected to various external forces, such as impact forces during operation and vibrations generated during device operation, this parallel axis design allows the connecting parts 410 to better withstand and transmit these forces, maintaining the stability of the connection. At the same time, it also helps to ensure that the relative positional relationship between the components of the entire clamping assembly 400 remains unchanged during long-term use, reducing the probability of failures caused by loose connections or deformation, and improving the service life and reliability of the device.

[0047] In some specific embodiments, the support base 430, the clamping member 420, and the perforated side corresponding to one of the connecting members 410 are all provided with openings. In actual operation, this perforated structure with openings plays an important role when it is necessary to quickly unlock the wrench 100 and the socket 200 or to replace wrenches 100 and sockets 200 of different specifications. Due to the existence of the openings, the support base 430 and the clamping member 420 can rotate relative to the other connecting member 410. For example, when unlocking, the operator only needs to gently rotate the support base 430 or the clamping member 420 to rotate it around the other connecting member 410 by a certain angle to easily loosen the wrench 100 from the socket 200, or to remove the original wrench 100 and socket 200 and then quickly replace them with new parts. This design greatly simplifies the operation process, reduces operation time, and thus further improves work efficiency, especially suitable for work scenarios that require frequent replacement of wrenches 100 and sockets 200. The side of the connector 410 is provided with a limiting groove 411 corresponding to the through hole with an opening on the support 430. When the support 430 and the connector 410 are assembled, the through hole with an opening on the support 430 can fall exactly into the limiting groove 411. At this time, the limiting groove 411 limits the connector (here the support 430 can be regarded as a type of connector) along the axial direction of the connector 410, which facilitates the reliable connection between the support 430 and the connector 410 during use in this embodiment.

[0048] In some specific embodiments, the driving member 440 is rod-shaped. The driving member 440 passes through the support base 430 through a threaded connection and presses against the tightening member 420. The axis of the driving member 440 coincides with the axis of the sleeve 200, which facilitates the provision of a stable and reliable tightening force to the tightening member 420 and ensures the reliability of this embodiment.

[0049] In some specific embodiments, the end face of the clamping member 420 near the wrench 100 is provided with a rubber pad, and the surface of the rubber member is provided with anti-slip texture, so as to ensure the reliability of the clamping member 420 when pressing the wrench 100, and also reduce the probability of the clamping member 420 pressing the wrench 100 and causing it to be damaged.

[0050] In some specific embodiments, the end face of the clamping member 420 near the driving member 440 is provided with an abutment groove 421, which is used to limit and guide the pushing position of the driving member 440 on the clamping member 420, so as to ensure the stable transmission of the pushing force of the driving member 440 to the clamping member 420 and ensure the reliability of this embodiment.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A fastener calibration device, characterized by, The utility model relates to a wrench (100), a sleeve (200) is sleeved on the corresponding connecting column of the wrench (100), a clamping assembly (300) is arranged on the side wall of the sleeve (200), a tightening assembly (400) is arranged on the side of the wrench (100) away from the sleeve (200), the tightening assembly (400) comprises a connecting piece (410) and a tightening piece (420), the connecting piece (410) is connected with the clamping assembly (300), the tightening piece (420) is located on the side of the wrench (100) away from the sleeve (200), the tightening assembly (400) can drive the tightening piece (420) to be close to the clamping assembly (300), so that the wrench (100) is fastened with the sleeve (200). The clamping assembly (300) comprises a clamping seat (310), the clamping seat (310) is provided with a clamping part, the clamping part is connected with the side wall of the sleeve (200), and the clamping seat (310) is connected with the connecting piece (410). The clamping seat (310) is symmetrically provided with two clamping pieces (320), the opposite ends of the two clamping pieces (320) are provided with clamping pieces (320), the opposite ends of the two clamping pieces (320) are provided with clamping pieces (320), the opposite ends of the two clamping pieces (320) are provided with clamping pieces (320), and the opposite ends of the two clamping pieces (320) are provided with clamping pieces (320). The clamping piece (320) is a circular arc surface recessed in the direction away from the sleeve (200), the fixing piece is a clamp (330), the clamp (330) is sleeved on the circumferential side of the two clamping pieces (320), and the two clamping pieces (320) are used to jointly form the clamping part. The opposite sides of the two clamping pieces (320) are provided with limiting holes (321) corresponding to the clamp (330), and the clamp (330) penetrates the two limiting holes (321) in sequence.

2. The fastener calibration device of claim 1, wherein, The tightening assembly (400) further comprises a supporting seat (430) and a driving piece (440), the driving piece (440) is arranged on the supporting seat (430), the connecting piece (410) is in the shape of a rod, one end of the connecting piece (410) is connected with one of the clamping seats (310), and the other end of the connecting piece (410) is connected with the supporting seat (430); the connecting piece (410) penetrates the tightening piece (420), the tightening piece (420) is located between the supporting seat (430) and the wrench (100), and the driving piece (440) can drive the tightening piece (420) to be close to the end surface of the wrench (100) away from the sleeve (200).

3. The fastener calibration device of claim 2, wherein, The connecting piece (410) is provided with two connecting pieces (410) and corresponds to the two clamping seats (310), and the axes of the two connecting pieces (410) are parallel to the axis of the sleeve (200).

4. The fastener calibration device of claim 3, wherein, ​ 5. The fastener calibration device of claim 4, wherein, ​ 6. The fastener calibration device of claim 3, wherein, ​ 7. The fastener calibration device of claim 6, wherein, ​ 8. The fastener calibration device of claim 7, wherein, The support base (430), the top pressing piece (420) and the corresponding perforated side of one of the connecting pieces (410) are all provided with openings, and a limiting groove (411) is formed in the side of the connecting piece (410) and corresponds to the perforation provided with the opening on the support base (430).

9. The fastener calibration device of claim 7, wherein, The driving piece (440) is in the shape of a rod, is threaded through the support base (430) and is in abutment against the top pressing piece (420), and the axis of the driving piece (440) coincides with the axis of the sleeve (200).

10. The fastener calibration device of claim 9, wherein, An abutment groove (421) is formed in the end face of the top pressing piece (420) close to the driving piece (440).

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