Clamp suitable for cross biaxial fatigue testing machine
By designing a fixture suitable for a biaxial fatigue testing machine, and utilizing multiple clamping components, a linkage structure, and liquid medium propulsion, the problem of inaccurate testing caused by clamping gaps was solved, achieving higher stability and accuracy.
Patent Information
- Application Number
- CN202511135437.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-13
- Publication Date
- 2025-10-17
AI Technical Summary
The existing biaxial fatigue testing machine fixtures have gaps when clamping the workpiece, resulting in low testing accuracy.
A fixture is designed, including a base, a movable component, a first clamping component, a second clamping component, and a linkage structure. The workpiece to be tested is clamped at different heights by multiple clamping components, and the second clamping component is pushed against the workpiece by the linkage structure and liquid medium, thereby reducing the gap between the fixture and the workpiece and improving stability and testing accuracy.
By linking multiple clamping components and using liquid medium to propel the device, the gap between the clamp and the workpiece is reduced, improving clamping stability and testing accuracy, thus ensuring the accuracy of fatigue performance testing of the workpiece under test.
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Figure CN120800985A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] Embodiments of the present application relate to the field of testing strength properties of solid materials with mechanical stress, in particular to a fixture suitable for a cross-biaxial fatigue testing machine. BACKGROUND
[0002] The statements herein are merely provided to give a basic understanding of the application, and are not necessarily intended to constitute the prior art.
[0003] Fatigue properties of materials are related to the service life of the materials, and thus it is necessary to test the fatigue properties of the materials.
[0004] A cross-biaxial fatigue testing machine is a kind of experimental equipment for testing fatigue properties of materials or structures under multi-axial alternating loads, and is used for analyzing fatigue properties of materials under complex stress states. Generally, a fixture is used to clamp a workpiece made of a material to be tested, and the fixture clamping the workpiece is installed to the cross-biaxial fatigue testing machine to carry out the test of the fatigue properties of the material to be tested. However, the current fixture still has limitations when clamping the workpiece to be tested. SUMMARY
[0005] A brief summary of the application is presented in the following to provide a basic understanding of some aspects of the application. It should be understood that this summary is not an exhaustive overview of the application. It is not intended to identify key or important parts of the application, nor is it intended to limit the scope of the application. Its purpose is merely to present some concepts in a simplified form as a prelude to the more detailed description discussed later.
[0006] To solve the above problems, embodiments of the present application provide a fixture suitable for a cross-biaxial fatigue testing machine, which comprises a base, a plurality of moving parts, a plurality of first clamping parts, a plurality of second clamping parts, and at least one linkage structure. The base forms a clearance hole for the workpiece to pass through; the plurality of moving parts are arranged at intervals along the circumferential direction of the clearance hole on the base, and each moving part is arranged to be movable towards or away from the clearance hole; the plurality of first clamping parts and the plurality of second clamping parts are arranged to clamp the workpiece at different heights; each first clamping part and a second clamping part are arranged on a corresponding moving part to abut or release the workpiece when the moving part moves towards or away from the clearance hole; and each linkage structure is used to connect a first clamping part and a second clamping part arranged on the same moving part, and is arranged to move the corresponding second clamping part towards the clearance hole when the workpiece slides relative to the first clamping part along the height direction of the workpiece to make the first clamping part move towards the second clamping part, so as to abut the workpiece.
[0007] The fixture provided by the embodiment of the present application can clamp the workpiece to be tested at different heights through the plurality of first clamping pieces and the plurality of second clamping pieces, so that the stability when clamping the workpiece to be tested can be improved, and the accuracy of the test on the workpiece to be tested can be ensured; and when the workpiece to be tested slides relative to the first clamping piece along the height direction of the workpiece to be tested, the friction between the first clamping piece and the workpiece to be tested can drive the first clamping piece to move towards the direction close to the second clamping piece, the first clamping piece and the second clamping piece arranged on the same moving piece are connected through the linkage structure, so that the corresponding second clamping piece can move towards the direction close to the accommodation hole to abut against the workpiece to be tested, so that the gap between the fixture and the workpiece to be tested can be reduced, the stability when clamping the workpiece to be tested can be further improved, and the accuracy of the test on the workpiece to be tested can be further ensured. BRIEF DESCRIPTION OF DRAWINGS
[0008] Other purposes and advantages of the present application will be apparent and can help to have a comprehensive understanding of the present application through the description of the embodiments of the present application below with reference to the accompanying drawings.
[0009] Figure 1 is a structural schematic view of the fixture suitable for a cross double shaft fatigue testing machine provided by the embodiment of the present application.
[0010] Figure 2 is Figure 1 The first clamping piece and the linkage structure are assembled, and the structural schematic view of the assembled structure is shown in the figure, but the second sliding fitting piece is not shown.
[0011] Figure 3 is Figure 1 The second clamping piece and the second sliding fitting piece of the linkage structure are assembled, and the structural schematic view of the assembled structure is shown in the figure.
[0012] Figure 4 is Figure 2 The structure near the abutting assembly is shown in the partial enlarged view.
[0013] Figure 5 is Figure 1 The fixture in the A local area is shown in the partial enlarged view.
[0014] BRIEF DESCRIPTION OF DRAWINGS
[0015] 100, fixture;
[0016] 10, base; 101, accommodation hole; 102, sliding groove;
[0017] 20, moving piece;
[0018] 30, first clamping member; 31, first plate member; 32, limiting member; 33, force providing member; 34, abutting assembly; 341, abutting housing member; 3410, abutting chamber; 342, abutting rod member; 343, elastic member; 344, guide groove; 345, non-slip pad;
[0019] 40, second clamping member; 41, abutting column;
[0020] 50, linkage structure; 51, first sliding fitting member; 510, first sliding fitting chamber;
[0021] 52, second sliding fitting member; 5201, second sliding fitting chamber; 5202, sliding groove;
[0022] 53, connecting member; 530, communicating chamber;
[0023] 54, sliding member;
[0024] 60, driving mechanism; 61, motor; 62, transmission assembly; 621, transmission gear; 6211, first straight gear; 6212, second straight gear;
[0025] 622, rotating shaft; 623, bevel gear rack; 624, bevel gear; 625, threaded connecting member; 626, bearing seat;
[0026] 70, mounting member; 80, rack mounting member.
[0027] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are merely intended to illustrate the illustrative embodiments. DETAILED DESCRIPTION
[0028] Exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. In the description, all features that are possible to be implemented will not be described in order to make the present application clear and brief. It should be appreciated, however, that many implementation-specific decisions can have to be made in order to develop any such actual implementation, to implement developer-specific goals, such as compliance with system- and business-related constraints, which will vary from one implementation to another, and that such development work will not be discussed in detail herein. Moreover, it should be appreciated that, while the development work can be very laborious and time-consuming, it would be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure, and that many implementation-specific decisions can be made to accomplish the development work in a manner that is consistent with the present application.
[0029] It should also be noted that, in the drawings, only the structures and / or processing steps that are closely related to the scheme according to the present application are shown, and other details that are not closely related to the present application are omitted, in order to avoid obscuring the present application with unnecessary details.
[0030] The prior art clamp has a gap between the clamp and the workpiece to be tested when clamping the workpiece to be tested, and the gap causes the workpiece to be tested to slide relative to the clamp during the test process, affecting the accuracy of the test.
[0031] To solve the above problems, the embodiments of the present application provide a clamp suitable for a cross double-shaft fatigue testing machine.
[0032] Referring to Figure 1 , Figure 1 is a structural schematic diagram of the clamp 100 suitable for the cross double-shaft fatigue testing machine provided by the embodiments of the present application. The clamp 100 provided by the embodiments of the present application can include a base 10, a plurality of moving parts 20, a plurality of first clamping parts 30, a plurality of second clamping parts 40, and at least one linkage structure 50. The base 10 forms a clearance hole 101 for the workpiece to be tested to pass through; the plurality of moving parts 20 are arranged at intervals along the circumferential direction of the clearance hole 101 on the base 10, and each moving part 20 is arranged to be movable towards or away from the clearance hole 101; the plurality of first clamping parts 30 and the plurality of second clamping parts 40 are arranged to clamp the workpiece to be tested at different heights; each first clamping part 30 and a second clamping part 40 are arranged on a corresponding moving part 20 to abut or release the workpiece to be tested when the moving part 20 moves towards or away from the clearance hole 101; and each linkage structure 50 is used to connect a first clamping part 30 and a second clamping part 40 arranged on the same moving part 20, and is arranged to move the corresponding second clamping part 40 towards the clearance hole 101 when the workpiece to be tested slides relative to the first clamping part 30 along the height direction of the workpiece to be tested to make the first clamping part 30 move towards the second clamping part 40, thereby abutting the workpiece to be tested.
[0033] The clamp 100 provided by the embodiments of the present application can clamp the workpiece to be tested at different heights through the plurality of first clamping parts 30 and the plurality of second clamping parts 40, thereby improving the stability when clamping the workpiece to be tested and facilitating to ensure the accuracy of the test on the workpiece to be tested. When the workpiece to be tested slides relative to the first clamping part 30 along the height direction of the workpiece to be tested, the friction between the first clamping part 30 and the workpiece to be tested can drive the first clamping part 30 to move towards the second clamping part 40. The first clamping part 30 and the second clamping part 40 arranged on the same moving part 20 are connected through the linkage structure 50, so that the corresponding second clamping part 40 can move towards the clearance hole 101 to abut the workpiece to be tested, thereby reducing the gap between the clamp 100 and the workpiece to be tested, further improving the stability when clamping the workpiece to be tested, and further facilitating to ensure the accuracy of the test on the workpiece to be tested.
[0034] In some embodiments, the plurality of moving members 20 can be equidistantly arranged on the base 10.
[0035] Referring to Figure 2 and Figure 3 , Figure 2 is Figure 1 a structural schematic diagram of the assembled first clamping member 30 and the linkage structure 50, in which the second sliding fitting member is not shown. Figure 3 is Figure 1 a structural schematic diagram of the assembled second clamping member 40 and the second sliding fitting member 52 of the linkage structure 50. In some embodiments, each linkage structure 50 can include a first sliding fitting member 51, a second sliding fitting member 52, a connecting member 53, and a sliding member 54. The first sliding fitting member 51 forms a first sliding fitting chamber 510 (in order to facilitate the illustration of the internal structure, Figure 2 part of the first sliding fitting member 51 is omitted in the figure); the second sliding fitting member 52 forms a second sliding fitting chamber 5201 (in order to facilitate the illustration of the internal structure, Figure 3 part of the second sliding fitting member 52 is omitted in the figure); the connecting member 53 forms a communication chamber 530 in fluid communication with the first sliding fitting chamber 510 and the second sliding fitting chamber 5201; the sliding member 54 is in sliding fit with the first sliding fitting member 51 in the first sliding fitting chamber 510; the second clamping member 40 is in sliding fit with the second sliding fitting member 52 in the second sliding fitting chamber 5201; the first sliding fitting chamber 510, the second sliding fitting chamber 5201, and the communication chamber 530 are filled with liquid medium; when the first clamping member 30 moves towards the second clamping member 40, the sliding member 54 moves away from the accommodation hole 101 relative to the first sliding fitting member 51, thereby forcing the liquid medium to flow towards the second sliding fitting chamber 5201, and in turn pushing the second clamping member 40 to move towards the accommodation hole 101 relative to the second sliding fitting member 52. In such embodiments, the first sliding fitting chamber 510 and the second sliding fitting chamber 5201 are connected through the communication chamber 530, so that when the sliding member 54 moves away from the accommodation hole 101 relative to the first sliding fitting member 51, the liquid in the first sliding fitting chamber 510 can flow to the second sliding fitting chamber 5201 through the communication chamber 530, in turn pushing the second clamping member 40 to move towards the accommodation hole 101 relative to the second sliding fitting member 52, thereby achieving abutting against the workpiece to be tested, and improving the stability when clamping the workpiece to be tested.
[0036] The liquid medium is, for example, hydraulic oil.
[0037] In some embodiments, the sliding member 54 and the first sliding fitting member 51 are in sealed sliding fit, and the second clamping member 40 and the second sliding fitting member 52 are in sealed sliding fit, to prevent leakage of the liquid medium.
[0038] Referring to Figure 1 In some embodiments, the first sliding fitting 51 and the second sliding fitting 52 are arranged parallel to each other along the radial direction of the clearance hole 101, and the connecting piece 53 is perpendicular to the first sliding fitting 51 and the second sliding fitting 52. In such embodiments, the above arrangement is conducive to the flow of the liquid medium between the first sliding fitting chamber 510 and the second sliding fitting chamber 5201, and in turn, when the first clamping piece 30 moves towards the second clamping piece 40, the liquid medium is conducive to pushing the second clamping piece 40 to move relative to the second sliding fitting 52 along the radial direction of the clearance hole 101 towards the clearance hole 101.
[0039] Referring to Figure 2 In some embodiments, each first clamping piece 30 can include a first plate piece 31, a limiting piece 32, a force providing piece 33, and an abutting assembly 34. The first plate piece 31 is pivotably connected with the sliding piece 54; the limiting piece 32 is used to limit the minimum angle of rotation of the first plate piece 31 relative to the sliding piece 54; the force providing piece 33 is used to provide a force to the first plate piece 31 to keep the first plate piece 31 and the sliding piece 54 at a minimum angle; and the abutting assembly 34 forms an angle with the first plate piece 31 and is connected with the first plate piece 31 for abutting with the workpiece to be measured. In such embodiments, the first plate piece 31 is pivotably connected with the sliding piece 54, and the abutting assembly 34 is connected with the first plate piece 31, so that when the workpiece to be measured slides relative to the first clamping piece 30 along the height direction of the workpiece to be measured to move the first clamping piece 30 towards the second clamping piece 40, the frictional force between the abutting assembly 34 and the workpiece to be measured can drive the first plate piece 31 to flip, thereby pushing the sliding piece 54 to move relative to the first sliding fitting 51 away from the clearance hole 101, so that the second clamping piece 40 can move towards the clearance hole 101 and abut against the workpiece to be measured; and by arranging the limiting piece 32 to limit the minimum angle of rotation of the first plate piece 31 relative to the sliding piece 54, the first plate piece 31 is prevented from flipping excessively; and by arranging the force providing piece 33 to provide a force to the first plate piece 31 to keep the first plate piece 31 and the sliding piece 54 at a minimum angle, the first plate piece 31 and the sliding piece 54 can be kept at a fixed angle, so that the abutting assembly 34 can abut against the workpiece to be measured.
[0040] The force providing piece 33 is, for example, a torsion spring. The limiting piece 32 can be a limiting plate. The limiting piece 32 can be fixedly connected with the sliding piece 54, and the first plate piece 31 abuts against the limiting piece 32 under the action of the force providing piece 33.
[0041] Referring to Figure 2 and Figure 4 , Figure 4 is Figure 2A partial enlarged view of the structure shown near the abutting assembly 34. In some embodiments, the abutting assembly 34 can include an abutting shell 341 (for the convenience of showing the internal structure, part of the abutting shell 341 is omitted, Figure 4 The abutting shell 341 is fixedly connected with the first clamping member 30, and forms an abutting chamber 3410; each abutting rod 342 enters the abutting chamber 3410 and is arranged to be movable relative to the abutting shell 341, and each abutting rod 342 is used for abutting with the workpiece to be measured; and each elastic member 343 is used for providing a force to the corresponding abutting rod 342 in a direction away from the abutting shell 341. In such embodiments, the abutting rod 342 is movable relative to the abutting shell 341, so that the abutting rod 342 can abut with the workpiece to be measured which has different sizes or shapes; at the same time, the elastic member 343 provides a force to the corresponding abutting rod 342 in a direction away from the abutting shell 341, so that the abutting rod 342 can abut against the workpiece to be measured.
[0042] The elastic member 343 is, for example, a spring, and when the abutting rod 342 abuts with the workpiece to be measured, the abutting rod 342 can compress the spring, so that the spring can provide a force to the corresponding abutting rod 342 in a direction away from the abutting shell 341.
[0043] In some embodiments, the workpiece to be measured can slide relative to the abutting rod 342 along the height direction of the workpiece to be measured, and when the workpiece to be measured slides, the friction between the abutting rod 342 and the workpiece to be measured drives the abutting rod 342 to move in a direction close to the second clamping member 40.
[0044] Referring to Figure 4 In some embodiments, the abutting chamber 3410 can be divided to form a plurality of guide grooves 344; each abutting rod 342 is slidably arranged in a corresponding one of the guide grooves 344, so as to guide the sliding of the abutting rod 342 by the guide grooves 344, and avoid the abutting rod 342 from shaking.
[0045] The abutting shell 341 is arranged to prevent the abutting rod 342 from falling out of the guide groove 344.
[0046] Referring to Figure 4 In some embodiments, the abutting assembly 34 can further include a non-slip pad 345 arranged at one end of the abutting rod 342 facing the workpiece to be measured. In such embodiments, by arranging the non-slip pad 345, the friction between the workpiece to be measured and the first clamping member 30 can be increased, so as to further facilitate driving the first clamping member 30 to move in a direction close to the second clamping member 40 when the workpiece to be measured slides relative to the first clamping member 30 along the height direction of the workpiece to be measured.
[0047] In some embodiments, the surface of the anti-skid pad 345 can be formed with anti-skid lines to ensure the anti-skid performance of the anti-skid pad 345. The anti-skid pad 345 is made of, for example, an elastic material.
[0048] Referring to Figure 1 and Figure 2 In some embodiments, the first sliding fitting part 51 is located directly above the second sliding fitting part 52, and the first plate part 31 extends upwardly in a direction away from the second sliding fitting part 52, and the abutting rod part 342 and the abutting part 341 extend along the radial direction of the accommodation hole 101. In such embodiments, the above arrangement is conducive to ensuring the abutting effect of the abutting rod part 342 on the workpiece to be tested, while allowing the angle between the first plate part 31 and the sliding part 54 to change when the abutting rod part 342 moves in a direction close to the second clamping part 40, so that the sliding part 54 moves relative to the first sliding fitting part 51 in a direction away from the accommodation hole 101, thereby pushing the second clamping part 40 to move relative to the second sliding fitting part 52 in a direction close to the accommodation hole 101.
[0049] Referring to Figure 3 In some embodiments, the second clamping part 40 comprises a plurality of abutting columns 41, and the second sliding fitting part 52 further forms a plurality of sliding grooves 5202 in communication with the second sliding fitting chamber 5201, and each abutting column 41 is slidably arranged in a corresponding sliding groove 5202. In such embodiments, by forming the sliding grooves 5202 in communication with the second sliding fitting chamber 5201, the abutting columns 41 can be slid under the push of the liquid medium, so that the abutting columns 41 can abut against the workpiece to be tested; at the same time, the plurality of abutting columns 41 abutting against the workpiece to be tested is conducive to improving the stability when clamping irregular workpieces to be tested.
[0050] Referring to Figure 3 In some embodiments, the end surface of the abutting column 41 facing the workpiece to be tested is a curved surface. In such embodiments, when the workpiece to be tested slides relative to the first clamping part 30 in the height direction of the workpiece to be tested to move the first clamping part 30 in a direction close to the second clamping part 40, the corresponding abutting column 41 of the second clamping part 40 moves in a direction close to the accommodation hole 101. During the above process, the curved surface is conducive to avoiding deformation of the workpiece to be tested when abutting against the workpiece to be tested, thereby avoiding affecting the test of the fatigue performance of the workpiece to be tested.
[0051] Referring to Figure 1 and Figure 5 , Figure 5 is Figure 1The fixture 100 is shown in a local enlarged view of the A region. In some embodiments, the fixture 100 can further include a driving mechanism 60 for driving the plurality of moving members 20 to move synchronously towards or away from the center line of the positioning hole 101, so that the first clamping members 30 and the second clamping members 40 can synchronously abut against the workpiece to be measured, thereby avoiding the workpiece to be measured from tilting.
[0052] Referring to Figure 5 In some embodiments, the driving mechanism 60 can further include a motor 61 and a transmission assembly 62. The motor 61 is fixedly arranged on the base 10, and the transmission assembly 62 is used to transmit the movement of the motor 61 to the plurality of moving members 20, so that the plurality of moving members 20 can synchronously move towards or away from the center line of the positioning hole 101.
[0053] Referring to Figure 1 and Figure 5 In some embodiments, the transmission assembly 62 can include a transmission gear 621, a plurality of rotating shafts 622, a rack 623, and a plurality of pinions 624. Each rotating shaft 622 is threadedly connected with a moving member 20, so as to convert the rotation into the movement of the moving member 20; each pinion 624 is engaged with the rack 623, and each rotating shaft 622 is connected with a corresponding pinion 624; one rotating shaft 622 (for the sake of distinction from the other rotating shafts, this rotating shaft is referred to as a first rotating shaft, and the other rotating shafts are referred to as second rotating shafts) is connected with the motor 61 through the transmission gear 621 to transmit power to the first rotating shaft 622, so that the first rotating shaft 622 can be driven to rotate by the motor 61; the first rotating shaft 622 drives the corresponding pinion 624 to rotate, so that the second rotating shafts 622 can also be driven to rotate by the first rotating shaft 622 through the engagement of the pinions 624 and the rack 623, so that the motor 61 can drive each rotating shaft 622 to rotate at the same time, and thus the plurality of moving members 20 can synchronously move towards or away from the center line of the positioning hole 101.
[0054] The transmission assembly 62 can further include a plurality of bearing seats 626, and each rotating shaft 622 is connected with the base 10 through a bearing seat 626.
[0055] In some embodiments, the transmission gear 621 can include a first spur gear 6211 and a second spur gear 6212. The first spur gear 6211 is connected with the output shaft of the motor 61, the second spur gear 6212 is connected with the first rotating shaft 622, and the first spur gear 6211 is engaged with the second spur gear 6212 to transmit the rotation of the motor 61 to the first rotating shaft 622.
[0056] In some embodiments, the transmission assembly 62 can further include a plurality of threaded connections 625. Each threaded connection 625 is connected with a moving member 20 and is threadedly connected with a rotating shaft 622, so as to convert the rotation of the rotating shaft 622 into the movement of the moving member 20.
[0057] In some embodiments, the base 10 is provided with a plurality of sliding grooves 102, each of the moving members 20 is movably arranged in a corresponding one of the sliding grooves 102 and moves along the sliding groove 102. In such embodiments, the sliding grooves 102 are provided to guide the movement of the moving members 20.
[0058] Referring to Figure 1 In some embodiments, the clamp 100 can further include a mounting member 70 fixedly connected with the base 10, for mounting the clamp 100 to the cross double shaft fatigue testing machine.
[0059] Referring to Figure 5 In some embodiments, the clamp 100 can further include a rack mounting member 80 fixedly connected with the base 10, and the bevel gear 623 is arranged to be slidable relative to the rack mounting member 80, so as to be slidably arranged on the base 10.
[0060] It should be further noted that, for the embodiments of the present application, the embodiments and the features in the embodiments can be combined with each other to obtain new embodiments, without conflict.
[0061] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and should be subject to the protection scope of the claims.
Claims
1. A fixture suitable for a cross biaxial fatigue testing machine, characterized in that: include: A base, wherein the base is formed with a clearance hole for allowing the workpiece to be measured to pass through; A plurality of movable members are arranged on the base at intervals along the circumferential direction of the clearance hole, and each movable member is configured to be able to move toward or away from the clearance hole; A plurality of first clamping members and a plurality of second clamping members are arranged to clamp the workpiece to be measured at different heights; each of the first clamping members and the second clamping member is arranged on a corresponding one of the movable members to clamp or release the workpiece to be measured as the movable member moves toward or away from the clearance hole; At least one linkage structure, each of the linkage structures is used to connect a first clamping member and a second clamping member provided on the same movable member, and is configured so that when the workpiece to be measured slides relative to the first clamping member along the height direction of the workpiece to be measured so that the first clamping member moves in a direction close to the second clamping member, the corresponding second clamping member moves in a direction close to the clearance hole, thereby pressing against the workpiece to be measured.
2. The clamp according to claim 1, characterized in that Each of the linkage structures comprises: a first sliding fit member forming a first sliding fit chamber; a second sliding fitting member forming a second sliding fitting chamber; a connecting member forming a communication chamber that is in fluid communication with both the first sliding fit chamber and the second sliding fit chamber; A sliding member enters the first sliding fitting chamber and slides with the first sliding fitting member; The second clamping member enters the second sliding fitting cavity and slides with the second sliding fitting member; The first sliding fit chamber, the second sliding fit chamber and the connecting chamber are filled with liquid medium; when the first clamping member moves toward the direction approaching the second clamping member, the sliding member moves relative to the first sliding fit member in the direction away from the clearance hole, thereby forcing the liquid medium to flow toward the second sliding fit chamber, and then pushing the second clamping member to move relative to the second sliding fit member in the direction approaching the clearance hole.
3. The clamp according to claim 2, characterized in that The first sliding fitting member and the second sliding fitting member are arranged parallel to each other along the radial direction of the clearance hole; and the connecting member is perpendicular to the first sliding fitting member and the second sliding fitting member.
4. The clamp according to claim 2 or 3, characterized in that: Each of the first clamping members comprises: a first plate member pivotally connected to the sliding member; a limiting member, used for limiting a minimum angle of rotation of the first plate relative to the sliding member; a force providing member, configured to provide a force to the first plate member to maintain a minimum angle between the first plate member and the sliding member; The abutting assembly forms an angle with the first plate and is connected to the first plate, and is used for abutting against the workpiece to be measured.
5. The clamp according to claim 4, characterized in that The abutment assembly comprises: an abutment shell member, fixedly connected to the first plate member, the abutment shell member forming an abutment chamber; a plurality of abutment rods, each of which enters the abutment chamber and is configured to be movable relative to the abutment housing, and each of which is configured to abut against the workpiece to be measured; A plurality of elastic members, each of the elastic members is used for providing a force to the corresponding abutting rod member to move in a direction away from the abutting shell member.
6. The clamp according to claim 5, characterized in that The abutting chamber is divided into a plurality of guide grooves, and each of the abutting rods is slidably disposed in a corresponding one of the guide grooves.
7. The clamp according to claim 5, characterized in that The abutment assembly further comprises: An anti-slip pad is provided on one end of the abutting rod facing the workpiece to be measured.
8. The clamp according to claim 5, characterized in that The first sliding fitting member is located directly above the second sliding fitting member; The first plate extends obliquely upward in a direction away from the second sliding fitting; The abutting shell and the abutting rod extend along the radial direction of the evacuation hole.
9. The clamp according to claim 2, characterized in that The second clamping member includes a plurality of abutment posts, The second sliding fitting member further forms a plurality of sliding grooves communicating with the second sliding fitting chamber. Each of the abutting posts is slidably disposed in a corresponding one of the sliding grooves.
10. The clamp according to claim 9, characterized in that The end surface of the abutting column facing the workpiece to be measured is a curved surface.
11. The clamp according to any one of claims 1 to 10, characterized in that: Also includes: The driving mechanism is used to drive the multiple moving parts to move synchronously toward or away from the center line of the clearance hole.