Connecting rod type ultralow-temperature shearing and stretching testing device

Abstract

The utility model relates to a connecting rod type ultralow-temperature shearing and stretching testing device which is characterized in that a vacuum heat preservation barrel is provided with a low-temperature conveying pipe; the power assembly comprises a fixing part, a supporting part, a connecting part and a hydraulic part, the hydraulic part is arranged on the supporting part, and the two ends of the connecting part are hinged to the fixing part and the hydraulic part respectively; the force sensor is hinged to the central position of the connecting piece; the clamp assembly is arranged in an inner cavity of the vacuum heat preservation barrel. The clamp assembly comprises a first clamp and a second clamp, and the first clamp and the second clamp are oppositely arranged. The clamp connecting assembly comprises a clamp connecting piece and a clamp fixing seat, one end of the clamp connecting piece is hinged to the force sensor, the other end of the clamp connecting piece penetrates through the vacuum heat preservation barrel to be fixedly connected with the first clamp, and one end of the clamp fixing seat is fixedly connected with the bottom of an inner cavity of the vacuum heat preservation barrel; the other end of the clamp fixing seat is fixedly connected with the second clamp; and the laser range finder is mounted on the clamp connecting piece.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tensile testing device technical field, concretely relates to a connecting rod type ultralow temperature shearing tensile testing device. BACKGROUND

[0002] The patent application number CN201510443958.2 is a material mechanics testing machine that can perform tensile, compressive, shear and bending tests. Its structure is a quadrilateral frame structure, and its driving mechanism is a hand-operated turbine booster mechanism. However, there is no detailed structure of the sample clamp, which cannot clamp a plywood with a thickness of about 10 mm, and there is no ultra-low temperature supply and insulation structure. The patent application number CN201710545978.X provides a device for testing the tensile shear strength of an adhesive sample. Its driving mechanism is a gravity weight, and 5 tons of weight are needed for a tensile force of 50 kN. Therefore, it is not suitable for large stress requirements. There is no detailed structure of the sample clamp, which cannot clamp a sample with a thickness of about 10 mm. It is a normal temperature test without an ultra-low temperature supply and insulation structure. The patent application number CN202211291583.9 is a clamp for testing the tensile shear strength of an adhesive sample. It mainly clamps the sample by the friction force of the extrusion of the bolt and the wedge block. However, according to the calculation, the friction force alone cannot provide a clamping force of 50 kN. It is not suitable for ultra-low temperature and large stress, and it is not the structure of the entire testing device. The patent application number CN201110460066.5 is a silicone shear strength testing method and tensile equipment for silicone shear strength testing. It mainly introduces the testing method, and the clamp structure is just two clamping plates. It is not suitable for ultra-low temperature and large stress, and it is not the structure of the entire testing device. The patent application number CN201610184667.0 is a device and method for testing the tensile and compressive properties of inter-particle cement. Its driving mechanism is an electric lifting device, and there is no detailed structure of the sample clamp. There is no ultra-low temperature supply and insulation structure. The patent application number CN201611101077.3 is a device and method for testing the dynamic mechanical properties of materials under tensile shear composite loading. Its driving mechanism is an impact structure, and the test is a tensile shear composite stress. It does not conform to the structure of studying tensile or shear stress alone. There is no detailed structure of the sample clamp, and there is no ultra-low temperature supply and insulation structure. The patent application number CN200720169626.0 is an electromagnetic drive fatigue testing machine for testing the tensile shear resistance of an adhesive. Its driving mechanism is an electromagnetic device, and the structure is a quadrilateral frame structure. There is no detailed structure of the sample clamp, and there is no ultra-low temperature supply and insulation structure. The patent application number CN20161448223.5 is a shear tensile testing device for thermal insulation materials. Its structure is a quadrilateral frame structure, and its sample clamp structure is clamped by friction. According to the calculation, the friction force alone cannot provide a clamping force of 50 kN. It is not suitable for ultra-low temperature and large stress, and there is no ultra-low temperature supply and insulation structure.The patent application No. CN202121665207.2 is a tensile machine based on hard face welding piece shear strength test, which has a quadrilateral frame structure, no sample clamp structure, and no ultra-low temperature supply and heat preservation structure; the patent application No. CN202021696862.X is a heat insulation material shear tensile test device, which has a quadrilateral frame structure, motor drive, and no ultra-low temperature supply and heat preservation structure.

[0003] Through the above-mentioned disclosed prior art function, it can be seen that part of the existing shear tensile test device sample clamp cannot provide sufficient tensile clamping sample; part of the existing shear tensile test device has a quadrilateral frame structure, which is used for test structure at normal temperature, and has no ultra-low temperature supply and heat preservation structure, so it cannot measure the mechanical properties at ultra-low temperature. Practical new type content

[0004] In view of the deficiencies of the prior art, the utility model provides a connecting rod type ultra-low temperature shear tensile test device, which aims at solving the problem that the prior art shear tensile test device cannot measure the mechanical properties at ultra-low temperature.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A connecting rod type ultra-low temperature shear tensile test device, comprising:

[0007] A vacuum heat preservation barrel is provided with a low temperature conveying pipe;

[0008] A power assembly comprises a fixing piece, a support piece, a connecting piece and a hydraulic piece, the hydraulic piece is arranged on the support piece, and the two ends of the connecting piece are respectively hinged with the fixing piece and the hydraulic piece;

[0009] A force sensor is hinged with the center position of the connecting piece;

[0010] A clamp assembly is arranged in the inner cavity of the vacuum heat preservation barrel; the clamp assembly comprises a first clamp and a second clamp, the first clamp and the second clamp are arranged oppositely, the first clamp is used for fixing a first sample, the second clamp is used for fixing a second sample, and the first sample and the second sample are at least partially fixedly connected through a third sample;

[0011] A clamp connecting assembly comprises a clamp connecting piece and a clamp fixing seat, one end of the clamp connecting piece is hinged with the force sensor, the other end of the clamp connecting piece is fixedly connected with the first clamp through the vacuum heat preservation barrel, one end of the clamp fixing seat is fixedly connected with the bottom of the inner cavity of the vacuum heat preservation barrel, and the other end of the clamp fixing seat is fixedly connected with the second clamp.

[0012] a laser range finder mounted on the clamp connector.

[0013] Further, the first clamp and the second clamp each comprise:

[0014] a clamping connection frame comprising a connection part and a U-shaped clamping part fixedly connected, the connection part being used for fixedly connecting with the clamp connector or the clamp fixing seat, and the U-shaped clamping part being provided with a first clamping part and a second clamping part;

[0015] a clamping assembly comprising a first clamping piece and a second clamping piece, the first clamping piece being arranged on the first clamping part, and the second clamping piece being arranged on the second clamping part, the first clamping part and the second clamping part respectively clamping the first sample or the second sample from both sides of the first sample or the second sample.

[0016] Further, the first clamping piece and the second clamping piece each comprise a clamping plate, a clamping bolt and a clamping block, the clamping block being arranged on the clamping plate, the first clamping part and the second clamping part being provided with a through hole, and the clamping bolt being threadedly connected with the clamping plate block through the through hole.

[0017] Further, the clamping plate is provided with an anti-skid pattern on a side facing the first sample or the second sample.

[0018] Further, the clamping assembly further comprises a first fastening bolt, a second fastening bolt, a first fastening nut and a second fastening nut, the first fastening bolt being connected with the first fastening nut through the through holes arranged on the first clamping piece, the second clamping piece and the first sample, and the second fastening bolt being connected with the second fastening nut through the through holes arranged on the first clamping piece, the second clamping piece and the second sample.

[0019] Further, the first clamp and the second clamp each comprise a clamping piece, a countersunk screw and a gasket, the countersunk screw being fixedly connected with the screw hole of the clamping piece through the countersunk hole of the first sample or the second sample, the gasket being arranged between the countersunk screw and the countersunk hole, and the clamping piece being used for fixedly connecting with the clamp connector or the clamp fixing seat.

[0020] Further, the clamping piece comprises two U-shaped structural pieces, the two U-shaped structural pieces being fixedly connected in a cross shape, and the clamp connector or the clamp fixing seat being fixedly connected with the two U-shaped structural pieces in a cross shape.

[0021] Further, the bottom of the U-shaped structure is symmetrically provided with four screw holes.

[0022] Further, the top end of the fixing member, the top end of the hydraulic member and both ends and the central position of the connecting member are provided with hinge members, the hinge members are provided with pin holes, and the pin shafts pass through the pin holes.

[0023] Further, the low-temperature conveying pipe is a liquid nitrogen inlet pipe.

[0024] The connecting rod type ultra-low temperature shearing and tensile testing device has the advantages that:

[0025] The low-temperature conveying pipe is used for conveying the ultra-low temperature liquid or gas into the vacuum insulation barrel, so that the inner cavity of the vacuum insulation barrel is in an ultra-low temperature environment, and the mechanical properties of the ultra-low temperature can be measured by the first clamp and the second clamp located in the inner cavity of the vacuum insulation barrel. When the shearing force and the tensile force are measured, the hydraulic member can provide sufficient force to lift one end of the connecting member connected thereto, and the other end of the connecting member rotates around the fixing member. Since the connecting member is lifted, the first clamp can be lifted, and the second clamp is fixed, so that the shearing force or the tensile force data of the first sample and the second sample connected by the third sample in the ultra-low temperature environment can be collected by the force sensor, and the distance data of the laser range finder can be collected. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a perspective structural schematic view of the connecting rod type ultra-low temperature shearing and tensile testing device of the embodiment of the utility model;

[0027] Figure 2 is a structural assembly schematic view of the clamp assembly and the clamp connecting assembly of the embodiment 1 of the utility model;

[0028] Figure 3 is a structural schematic view of the clamp assembly of the embodiment 1 of the utility model;

[0029] Figure 4 is Figure 3 a sectional view of

[0030] Figure 5 is a structural assembly schematic view of the clamp assembly and the clamp connecting assembly of the embodiment 2 of the utility model;

[0031] Figure 6 is a structural schematic view of the clamp assembly of the embodiment 2 of the utility model;

[0032] Figure 7 is Figure 6 a plan view of

[0033] Figure 8 is Figure 6The structural exploded view of the device.

[0034] Explanation of reference signs:

[0035] 1, vacuum insulation barrel; 11, low-temperature conveying pipe; 21, fixing piece; 22, supporting piece; 23, connecting piece; 24, hydraulic piece; 3, force sensor; 4, clamp assembly; 41, first clamp; 42, second clamp; 421, clamping piece; 422, countersunk screw; 423, gasket; 424, U-shaped structural piece; 43, clamping connecting frame; 431, connecting part; 432, U-shaped clamping part; 433, first clamping part; 434, second clamping part; 44, clamping assembly; 441, first clamping piece; 442, second clamping piece; 443, clamping plate; 444, clamping bolt; 445, clamping stopper; 446, first fastening bolt; 447, second fastening bolt; 448, first fastening nut; 449, second fastening nut; 51, clamp connecting piece; 52, clamp fixing seat; 6, laser range finder; 71, first sample piece; 72, second sample piece; 73, third sample piece; 81, hinged piece; 82, pin shaft. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] In the description of the present application, it should be noted that, unless explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] As shown in FIG. Figures 1-8 A connecting rod type ultra-low temperature shear tensile testing device, comprising:

[0039] A vacuum insulation barrel 1, the vacuum insulation barrel 1 is provided with a low-temperature conveying pipe 11.

[0040] The power assembly comprises a fixing part 21, a supporting part 22, a connecting part 23 and a hydraulic part 24, the hydraulic part 24 is arranged on the supporting part 22, and the two ends of the connecting part 23 are hingedly connected with the fixing part 21 and the hydraulic part 24 respectively;

[0041] A force sensor 3 is hingedly connected with the center position of the connecting part 23;

[0042] A clamp assembly 4 is arranged in the inner cavity of the vacuum insulation barrel 1, and the clamp assembly 4 comprises a first clamp 41 and a second clamp 42, the first clamp 41 and the second clamp 42 are oppositely arranged, the first clamp 41 is used for fixing a first sample 71, the second clamp 42 is used for fixing a second sample 72, and the first sample 71 and the second sample 72 are at least partially fixedly connected through a third sample 73;

[0043] A clamp connecting assembly comprises a clamp connecting part 51 and a clamp fixing seat 52, one end of the clamp connecting part 51 is hingedly connected with the force sensor 3, the other end of the clamp connecting part 51 is fixedly connected with the first clamp 41 through the vacuum insulation barrel 1, one end of the clamp fixing seat 52 is fixedly connected with the bottom of the inner cavity of the vacuum insulation barrel 1, and the other end of the clamp fixing seat 52 is fixedly connected with the second clamp 42;

[0044] A laser range finder 6 is installed on the clamp connecting part 51.

[0045] The super-low-temperature liquid or super-low-temperature gas is transported to the vacuum insulation barrel 1 through the low-temperature conveying pipe 11, so that the inner cavity of the vacuum insulation barrel 1 is in a super-low-temperature environment, and thus the mechanical properties of the super-low-temperature can be measured through the first clamp 41 and the second clamp 42 arranged in the inner cavity of the vacuum insulation barrel 1. When the shear force and the tensile force are measured, the hydraulic part 24 can provide sufficient force to lift one end of the connecting part 23 connected therewith, and the other end of the connecting part 23 rotates around the fixing part 21. Since the connecting part 23 is lifted, the first clamp 41 can be lifted, and the second clamp 42 is fixed, so that the shear force or tensile force data of the first sample 71 and the second sample 72 connected through the third sample 73 in the super-low-temperature environment can be collected through the force sensor 3, and the distance data of the tensile force can be collected through the laser range finder 6.

[0046] Further, the top end of the fixing part 21, the top end of the hydraulic part 24 and the two ends and the center position of the connecting part 23 are provided with hinge parts 81, the hinge parts 81 are provided with pin holes, and pin shafts 82 pass through the pin holes.

[0047] Further, the low-temperature conveying pipe 11 is a liquid nitrogen inlet pipe. Liquid nitrogen is introduced into the vacuum insulation barrel 1 through the liquid nitrogen inlet pipe, so that the temperature of the inner cavity of the vacuum insulation barrel 1 is-196℃ to-273℃, the vacuum insulation barrel 1 can be insulated, so that the temperature of the inner cavity of the vacuum insulation barrel 1 remains constant during the test, and the temperature change affects the test results. It should be noted that the low-temperature conveying pipe 11 can also introduce other low-temperature gases or liquids, so that the temperature of the inner cavity of the vacuum insulation barrel 1 is in other low-temperature ranges, for testing the shear force and tensile force under other environmental temperatures.

[0048] It should be noted that the first sample 71 and the second sample 72 can be plywood, and the third sample 73 can be polyurethane, which is used to bond the two pieces of plywood.

[0049] The present application will be described below in conjunction with specific embodiments and drawings.

[0050] Example 1

[0051] As shown in Figures 1-4 The first clamp 41 and the second clamp 42 each include:

[0052] The clamping connection frame 43 includes a connecting portion 431 and a U-shaped clamping portion 432, the connecting portion 431 and the U-shaped clamping portion 432 are fixedly connected, the connecting portion 431 is used to be fixedly connected with the clamp connecting piece 51 or the clamp fixed seat 52, and the U-shaped clamping portion 432 is provided with a first clamping portion 433 and a second clamping portion 434.

[0053] The clamping assembly 44 includes a first clamping piece 441 and a second clamping piece 442, the first clamping piece 441 is arranged on the first clamping portion 433, and the second clamping piece 442 is arranged on the second clamping portion 434, and the first clamping portion 433 and the second clamping portion 434 clamp the first sample 71 or the second sample 72 from both sides of the first sample 71 or the second sample 72, respectively.

[0054] Since the first clamping portion 433 and the second clamping portion 434 are oppositely arranged, the first clamping piece 441 arranged on the first clamping portion 433 and the second clamping piece 442 arranged on the second clamping portion 434 can clamp the first sample 71 or the second sample 72 from both sides of the first sample 71 or the second sample 72, respectively.

[0055] When measuring the shear force, the hydraulic component 24 can provide enough force to lift one end of the connecting component 23 connected thereto, and the other end of the connecting component 23 rotates around the fixed component 21. Since the connecting component 23 is lifted, the first clamp 41 can be lifted, and the second clamp 42 is fixed, so that the shear force data of the first sample 71 and the second sample 72 connected by the third sample 73 in the ultra-low temperature environment can be collected by the force sensor 3, and the pulling distance data can be collected by the laser range finder 6.

[0056] Specifically, the first clamping component 441 and the second clamping component 442 each include a clamping plate 443, a clamping bolt 444, and a clamping block 445. The clamping block 445 is arranged on the clamping plate 443. The first clamping part 433 and the second clamping part 434 are provided with through holes. The clamping bolt 444 is threadedly connected with the clamping block 445 through the through holes and the clamping plate 443.

[0057] By rotating the clamping bolt 444, the extension length between the clamping bolt 444 and the clamping block 445 can be adjusted, the distance between the clamping plate 443 and the first clamping part 433 or the second clamping part 434 can be changed, and the distance between the first clamping component 441 and the second clamping component 442 can be adjusted. The first clamping component 441 and the second clamping component 442 clamp the first sample 71 or the second sample 72.

[0058] Specifically, the clamping plate 443 is provided with anti-skid lines on the side facing the first sample 71 or the second sample 72. By arranging the anti-skid lines, the friction between the clamping plate 443 of the first clamp 41 and the first sample 71 can be increased, and the friction between the clamping plate 443 of the second clamp 42 and the second sample 72 can be increased.

[0059] Specifically, the clamping assembly 44 further includes a first fastening bolt 446, a second fastening bolt 447, a first fastening nut 448, and a second fastening nut 449. The first fastening bolt 446 is connected with the first fastening nut 448 through the through holes arranged on the first clamping component 441, the second clamping component 442, and the first sample 71. The second fastening bolt 447 is connected with the second fastening nut 449 through the through holes arranged on the first clamping component 441, the second clamping component 442, and the second sample 72.

[0060] The first fastening bolt 446 is connected through the through hole of the first clamping piece 441, the second clamping piece 442 and the first sample 71 and the first fastening nut 448, which can further enhance the pressure applied by the first clamping piece 441 and the second clamping piece 442 to the first sample 71 from both sides of the first sample 71, so that the first clamp 41 can better clamp the first sample 71; the second fastening bolt 447 is connected through the through hole of the first clamping piece 441, the second clamping piece 442 and the first sample 71 and the second fastening nut 449, which can further enhance the pressure applied by the first clamping piece 441 and the second clamping piece 442 to the second sample 72 from both sides of the second sample 72, so that the second clamp 42 can better clamp the second sample 72.

[0061] Embodiment two

[0062] As shown in Figure 1 , Figures 5-8 , the first clamp 41 and the second clamp 42 each include a clamping piece 421, a countersunk screw 422 and a gasket 423, the countersunk screw 422 is fixedly connected through the countersunk hole of the first sample 71 or the second sample 72 and the screw hole of the clamping piece 421, and the gasket 423 is arranged between the countersunk screw 422 and the countersunk hole, and the clamping piece 421 is used to be fixedly connected with the clamp connecting piece 51 or the clamp fixed seat 52.

[0063] The first clamp 41 is fixedly connected through the countersunk screw 422 passing through the countersunk hole of the first sample 71 and the screw hole of the clamping piece 421, so that the first sample 71 can be fixed on the first clamp 41, and the second clamp 42 is fixedly connected through the countersunk screw 422 passing through the countersunk hole of the second sample 72 and the screw hole of the clamping piece 421, so that the second sample 72 can be fixed on the second clamp 42.

[0064] When measuring the tensile force, the hydraulic part 24 can provide enough force to lift one end of the connecting piece 23 connected thereto, and the other end of the connecting piece 23 rotates around the fixed part 21. Since the connecting piece 23 is lifted, the first clamp 41 can be lifted, and the second clamp 42 is fixed, so that the tensile force data of the first sample 71 and the second sample 72 connected by the third sample 73 in the ultra-low temperature environment can be collected by the force sensor 3, and the distance data can be collected by the laser range finder 6.

[0065] Specifically, the clamping piece 421 includes two U-shaped structure pieces 424, and the two U-shaped structure pieces 424 are fixedly connected in a cross shape, and the clamp connecting piece 51 or the clamp fixed seat 52 is fixedly connected with the cross position of the U-shaped structure piece 424. The clamping piece 421 formed by the cross fixed connection of the two U-shaped structure pieces 424 has better structural strength.

[0066] Specifically, the bottom of the U-shaped structure 424 is symmetrically provided with four screw holes. In use, two countersunk screws 422 are used to pass through two screw holes on the same diameter circle of the U-shaped structure 424, and are screwed with the countersunk screw holes of the first sample 71 or the second sample 72, so that the first sample 71 and the second sample 72 are fixed on the upper and lower clamping pieces 421 respectively.

[0067] The two screw holes on different diameter circles of the U-shaped structure 424 can be used to fix the first sample 71 or the second sample 72 of different sizes, so as to improve the application range of the U-shaped structure 424.

[0068] It should be noted that in other embodiments, the bottom of the U-shaped structure 424 is symmetrically provided with six, eight or more screw holes. Thus, the clamping piece 421 can be applied to the first sample 71 or the second sample 72 of different sizes.

[0069] The above is only a preferred embodiment of the present application, and does not limit the technical scope of the present application. Therefore, any slight modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical scheme of the present application.

Claims

1. A connecting rod type ultra-low temperature shear tensile testing device, characterized in that: include: A vacuum insulation barrel provided with a low-temperature delivery pipe; A power assembly, comprising: a fixing member, a supporting member, a connecting member and a hydraulic member, wherein the hydraulic member is arranged on the supporting member, and both ends of the connecting member are hinged to the fixing member and the hydraulic member respectively; a force sensor, the force sensor being hinged to a center position of the connecting member; A clamp assembly, the clamp assembly being disposed in the inner cavity of the vacuum insulation barrel; the clamp assembly comprising: a first clamp and a second clamp, the first clamp being disposed opposite the second clamp, the first clamp being used to secure a first sample, the second clamp being used to secure a second sample, the first sample and the second sample being at least partially fixedly connected via a third sample; A clamp connection assembly, the clamp connection assembly comprising: a clamp connection piece and a clamp fixing seat, one end of the clamp connection piece being hinged to the force sensor, the other end of the clamp connection piece passing through the vacuum insulation barrel and fixedly connected to the first clamp, one end of the clamp fixing seat being fixedly connected to the bottom of the inner cavity of the vacuum insulation barrel, and the other end of the clamp fixing seat being fixedly connected to the second clamp; A laser rangefinder is installed on the fixture connecting piece.

2. The connecting rod type ultra-low temperature shear tensile testing device according to claim 1, characterized in that: The first fixture and the second fixture both include: A clamping connection frame, the clamping connection frame comprising: a connecting portion and a U-shaped clamping portion, the connecting portion being fixedly connected to the U-shaped clamping portion, the connecting portion being used to be fixedly connected to the clamp connector or the clamp fixing seat, the U-shaped clamping portion being provided with a first clamping portion and a second clamping portion; The clamping assembly includes: a first clamping member and a second clamping member, the first clamping member is arranged on the first clamping part, and the second clamping member is arranged on the second clamping part, and the first clamping part and the second clamping part clamp the first sample part or the second sample part from both sides of the first sample part or the second sample part respectively.

3. The connecting rod type ultra-low temperature shear tensile testing device according to claim 2, characterized in that: The first clamping member and the second clamping member both include: a clamping plate, a clamping bolt and a clamping block, the clamping block is arranged on the clamping plate, the first clamping portion and the second clamping portion are provided with through holes, the clamping bolt passes through the through holes and is threadedly connected to the clamping plate block.

4. The connecting rod type ultra-low temperature shear tensile testing device according to claim 3, characterized in that: The clamping plate is provided with anti-slip grooves on a side facing the first sample piece or the second sample piece.

5. The connecting rod type ultra-low temperature shear tensile testing device according to claim 3, characterized in that: The clamping assembly also includes: a first fastening bolt, a second fastening bolt, a first fastening nut and a second fastening nut. The first fastening bolt passes through the through holes set in the first clamping piece, the second clamping piece and the first sample and is connected to the first fastening nut. The second fastening bolt passes through the through holes set in the first clamping piece, the second clamping piece and the second sample and is connected to the second fastening nut.

6. The connecting rod type ultra-low temperature shear tensile testing device according to claim 1, characterized in that: The first clamp and the second clamp both include: a clamping member, a countersunk screw and a gasket. The countersunk screw passes through the countersunk screw hole of the first sample or the second sample and is fixedly connected to the screw hole of the clamping member. The gasket is arranged between the countersunk screw and the countersunk screw hole. The clamping member is used to be fixedly connected to the clamp connecting member or the clamp fixing seat.

7. The connecting rod type ultra-low temperature shear tensile testing device according to claim 6, characterized in that: The clamping member includes two U-shaped structural members, the two U-shaped structural members are cross-fixedly connected, and the clamp connecting member or the clamp fixing seat is fixedly connected to the cross-intersection position of the U-shaped structural members.

8. The connecting rod type ultra-low temperature shear tensile testing device according to claim 7, characterized in that: Four screw holes are symmetrically arranged on the bottom of the U-shaped structural member.

9. The connecting rod type ultra-low temperature shear tensile testing device according to claim 1, characterized in that: The top of the fixing member, the top of the hydraulic member, both ends of the connecting member and the center are provided with hinged members, the hinged members are provided with pin holes and also include pin shafts, and the pin shafts pass through the pin holes.

10. The connecting rod type ultra-low temperature shear tensile testing device according to claim 1, characterized in that: The low-temperature delivery pipe is a liquid nitrogen inlet pipe.

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