Tensile test device in low-temperature environment

Abstract

The utility model discloses a tensile testing device in a low-temperature environment, which relates to the field of mechanical property testing devices and comprises a tensile flange, a low-temperature liquid container, a low-temperature liquid container pressure spring, a sealing washer, a low-temperature liquid container fixing ring, a sensor support, a sensor and the like. The stretching flange is connected with a tubular insulator of a tested piece through a bolt and a nut, and an opening is formed in the bottom of the low-temperature liquid container, so that a whole formed by the stretching flange and the tested piece can be placed in the low-temperature liquid container; the stretching flange is in threaded connection with the stretching fixing ring, a sealing gasket is arranged between the bottom of the low-temperature liquid container and the fixing ring, the low-temperature liquid container compression spring is located between the flange and the low-temperature liquid container, and the low-temperature liquid container compression spring and the low-temperature liquid container fixing ring fix the position of the low-temperature liquid container. Therefore, leakage caused by loosening of the low-temperature liquid container in the stretching process is prevented. The tensile test device can meet the tensile test of the tested piece with the two ends being of pipe structures.

Description

Technical Field

[0001] The utility model relates to the field of mechanical property testing devices, in particular to a tensile testing device in a low temperature environment. Background Art

[0002] Composite insulators are widely used in superconducting magnet systems of superconducting electrical physics devices. They are used for low-temperature liquids such as liquid nitrogen, liquid helium, or for liquid helium transportation, for room-temperature helium recovery, and for structural parts supporting cold mass components. It is necessary for them to have certain tensile properties during operation. There is no ready-made solution for devices such as tensile testing of composite insulating structural parts.

[0003] Due to the large variations in size and shape of composite insulators and structural components used to support cold mass components, current tensile testing devices have a small range and cannot test at low temperatures, cannot achieve real-time monitoring of internal data, and can only be used for tensile mechanical property testing of insulating structural components, not for tensile mechanical property testing of other tubular structural components, making it impossible to achieve multi-purpose use of one machine. Summary of the Invention

[0004] In order to solve the problems in the prior art of using conventional tensile testing devices in the tensile mechanical properties test of insulators made of glass fiber reinforced epoxy resin composite materials, such as small range, inability to test at low temperatures, inability to achieve real-time monitoring of internal data, and inability to achieve multi-purpose use of one device due to the single test piece, the utility model provides a tensile testing device for low-temperature environments, which has a large range, can be tested at low temperatures, and can achieve real-time monitoring of internal data. It can be used not only for tensile mechanical properties testing of insulating structural parts, but also for tensile mechanical properties testing of other tubular structural parts, achieving multi-purpose use of one device.

[0005] The utility model adopts the following technical solutions:

[0006] A tensile testing device for use in a low-temperature environment, comprising upper and lower tensile flanges, a cryogenic liquid container, a cryogenic liquid container compression spring, a sealing gasket, a cryogenic liquid container fixing ring, a sensor bracket, and a sensor; the upper and lower tensile flanges are both T-shaped structures; the T-shaped structure includes a horizontal side and an end;

[0007] The protruding part of the T-shaped structure is an end head, which is used to cooperate with the mechanical testing machine; the connecting block is connected to the lower side of the horizontal side of the T-shaped structure, and the connecting block is a circular ring, which is used to make the stretching flange cooperate with the workpiece under test; the two ends of the workpiece under test are step-shaped structures, and the connecting block is mounted on the outside of the step-shaped structure; the horizontal sides of the T-shaped structure of the upper and lower stretching flanges are fixedly connected to the connecting block by bolts; the bolts pass through the horizontal sides of the T-shaped structure of the upper and lower stretching flanges; nuts are installed on the bolts, which are used to compress the horizontal sides of the T-shaped structure of the upper and lower stretching flanges and the connecting block through the bolts; a low-temperature liquid container compression spring is provided between the horizontal side of the T-shaped structure of the lower stretching flange and the inner bottom wall of the low-temperature liquid container;

[0008] After the upper and lower stretching flanges are fixed to the test piece, the whole is placed into the cryogenic liquid container through the opening above the cryogenic liquid container, so that the test piece is sleeved in the cryogenic liquid container; the opening at the bottom of the cryogenic liquid container can only pass through the port, thereby blocking the horizontal edge of the T-shaped structure inside the cryogenic liquid container; the upper stretching flange is located at the opening above the cryogenic liquid container, and the horizontal edge of the T-shaped structure of the upper stretching flange can freely pass through the opening above the cryogenic liquid container; the cryogenic liquid container fixing ring is installed on the end head of the lower stretching flange, and a sealing gasket is provided between the cryogenic liquid container fixing ring and the outer bottom wall of the cryogenic liquid container to fix the cryogenic liquid container and maintain sealing; the sensor bracket is installed on the inner wall of the inner cylinder of the cryogenic liquid container through a guide rail, and the sensor is installed on the sensor bracket.

[0009] Furthermore, the stretching flange is connected to the workpiece under test through bolts and nuts, so that the stretching flange and the workpiece under test become a tensile whole, and the stretching flange is arranged at both ends of the workpiece under test.

[0010] Furthermore, the entirety of the stretch flange and the test piece is placed into the cryogenic liquid container through an opening on the upper side of the cryogenic liquid container.

[0011] Furthermore, the lower stretch flange is threadedly connected to the low-temperature liquid container fixing ring, and the low-temperature liquid container compression spring, sealing gasket and low-temperature liquid container fixing ring clamp the lower stretch flange and the low-temperature liquid container, so that a seal is generated between the lower stretch flange and the bottom plate of the low-temperature liquid container.

[0012] Furthermore, the connecting block is flush with the top of the horizontal side of the T-shaped structure.

[0013] Furthermore, the cryogenic liquid container is a hollow two-layer structure, and the middle of the two-layer structure is filled with thermal insulation material.

[0014] Furthermore, the sensor bracket and the inner wall of the inner cylinder of the cryogenic liquid container are both provided with guide rails, and the guide rails of the two cooperate with each other.

[0015] Furthermore, the sensor bracket and the inner wall of the inner cylinder of the cryogenic liquid container are both provided with guide rails, and the guide rails of the two cooperate with each other to facilitate disassembly, replacement or change of position.

[0016] Furthermore, the sensor bracket is provided with a detachable sensor interface, on which different types of sensors can be installed, so as to facilitate real-time monitoring of various data inside the cryogenic liquid container.

[0017] Beneficial effects:

[0018] In the present invention, both ends of the tensile test piece are fixed to the clips on the testing machine through the tensile flange, so that both ends of the tensile test piece are subjected to the tensile effect, thereby ensuring that the test piece is subjected to the tensile load.

[0019] The utility model has the advantages of simple and reliable structure, small deformation of composite material insulators and structural parts used to support cold components, ability to be tested in low temperature environments and real-time monitoring of internal data. It can be used not only for tensile mechanical property testing of insulating structural parts, but also for tensile mechanical property testing of other tubular structural parts, realizing multi-purpose use of one machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a tensile testing device in a low temperature environment according to the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of a tensile testing device in a low-temperature environment according to the present invention;

[0022] Figure 3a This is a front view of a tensile testing device in a low temperature environment according to the present invention;

[0023] Figure 3b This is a perspective front view of a tensile testing device for a low temperature environment according to the present invention;

[0024] Figure 3c This is a top view of a tensile testing device in a low temperature environment according to the present invention;

[0025] Figure 4 This is a schematic diagram of load application of a tensile testing device in a low temperature environment of the present invention.

[0026] Among them, the accompanying drawings are marked as follows: stretching flange 1; cryogenic liquid container 2; cryogenic liquid container compression spring 3; sealing gasket 4; cryogenic liquid container fixing ring 5; sensor bracket 6; sensor 7; end 8; measured object 9; bolt 10; nut 11; connecting block 12. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 , Figure 2 As shown, a tensile testing device for a low-temperature environment of the present invention includes a tensile flange 1, a low-temperature liquid container 2, a low-temperature liquid container compression spring 3, a sealing gasket 4, a low-temperature liquid container fixing ring 5, a sensor bracket 6, a sensor 7, an end 8, a bolt 10, a nut 11, and a connecting block 12, which is used to perform a tensile test on a test piece 9. The upper and lower tensile flanges 1 are both T-shaped structures. The protruding part of the T-shaped structure is the end 8, which is used to cooperate with a mechanical testing machine. The connecting block 12 is connected to the lower side of the horizontal side of the T-shaped structure, which is a circular ring and is used to make the tensile flange 1 cooperate with the test piece 9.

[0029] The test piece 9 can be a tubular insulator or other tubular products. Both ends of the test piece 9 are step-shaped structures, and a ring-shaped connecting block 12 is sleeved on the outside of the step-shaped structure. The thickness of the connecting block 12 is equal to the thickness of the step-shaped structure. The connecting block 12 is flush with the horizontal side of the T-shaped structure, and the horizontal sides of the T-shaped structures of the upper and lower stretching flanges 1 are fixedly connected to the connecting block 12 by bolts 10. The bolts 10 pass through the horizontal sides of the T-shaped structures of the upper and lower stretching flanges 1. The nut 11 is installed on the bolt 10 and is used to compress the horizontal sides of the T-shaped structures of the upper and lower stretching flanges 1 and the connecting block 12 through the bolt 10. A low-temperature liquid container compression spring 3 is arranged between the horizontal side of the T-shaped structure of the lower stretching flange 1 and the bottom wall of the low-temperature liquid container 2.

[0030] After the upper and lower stretch flanges 1 are connected to the test piece 9, the entire assembly is lowered into the cryogenic liquid container 2 through the upper opening, so that the test piece 9 is nested within the cryogenic liquid container 2. The opening at the bottom of the cryogenic liquid container 2 is only wide enough to pass through the port 8, while the horizontal edge of the T-shaped structure is blocked inside the cryogenic liquid container 2. The upper stretch flange 1 is located at the upper opening of the cryogenic liquid container 2, and the horizontal edge of the T-shaped structure of the upper stretch flange 1 can freely pass through the upper opening.

[0031] The cryogenic liquid container fixing ring 5 is installed on the end 8 of the lower stretch flange 1. A sealing gasket 4 is provided between the cryogenic liquid container fixing ring 5 and the outer bottom wall of the cryogenic liquid container 2 to fix the cryogenic liquid container 2 and maintain sealing.

[0032] Sensor bracket 6 is mounted on the inner wall of the inner cylinder of cryogenic liquid container 2 via guide rails, and sensor 7 is mounted on sensor bracket 6. A cryogenic liquid, such as liquid nitrogen or liquid helium, is placed in the inner cylinder of cryogenic liquid container 2. The assembly consisting of upper and lower tensile flanges 1 and the test piece 9 is tested using the end 8 of the tensile flanges 1 in conjunction with a mechanical testing machine.

[0033] The tensile flange 1 is connected to the test piece 9 by means of bolts 10 and nuts 11, so as to form a tensile integral body. Two tensile flanges 1 are arranged above and below the test piece 9 and have the same shape.

[0034] Preferably, the stretching flange 1 is threadedly connected to the cryogenic liquid container fixing ring 5. The cryogenic liquid container compression spring 3 and the cryogenic liquid container fixing ring 5 secure the position of the cryogenic liquid container 2 to prevent the cryogenic liquid container 2 from loosening and leaking during the stretching process. The cryogenic liquid container compression spring 3, the sealing gasket 4, and the cryogenic liquid container fixing ring 5 clamp the stretching flange 1 and the cryogenic liquid container 2 together, creating a seal between the lower stretching flange 1 and the bottom plate of the cryogenic liquid container 2.

[0035] Preferably, the cryogenic liquid container 2 is a hollow two-layer structure, and the middle of the two-layer structure is filled with thermal insulation material to reduce heat transfer and maintain the internal low temperature.

[0036] Preferably, the sensor bracket 6 and the inner wall of the inner cylinder of the cryogenic liquid container 2 are both provided with corresponding guide rails, and the two are matched with the guide rails to facilitate removal, replacement, or repositioning. The sensor bracket 6 has a detachable sensor interface that can be installed with different types of sensors to facilitate real-time monitoring of various data inside the cryogenic liquid container 2.

[0037] Preferably, a spacer is provided between the position where the bolt 10 extends out of the connecting block 12 and the end head 8 .

[0038] like Figure 4 As shown, the tensile flange 1 is connected to the test piece 9 by bolts and nuts, so that it becomes a tensile whole. The end heads 8 of the tensile flanges 1 at both ends are subjected to axial force F, so that the test piece 9 is subjected to axial force.

[0039] like Figure 3a , Figure 3b , Figure 3cAs shown, when using the tensile testing device of the present invention, tensile flanges 1 are installed at both ends of the test piece. Then, the cryogenic liquid container compression spring 3 is passed through the end of the tensile flange 1. The tensile flange 1 and the test piece 9 are placed into the cryogenic liquid container 2 through the opening at the top. The end 8 of the tensile flange 1 is passed through the opening at the bottom of the cryogenic liquid container 2. After the sealing gasket 4 is inserted, the cryogenic liquid container fixing ring 5 is installed on the end 8 of the tensile flange 1 to fix the cryogenic liquid container 2 and maintain the seal. The required sensor 7 is installed on the sensor bracket 6, and the sensor bracket 6 is installed on the inner wall of the inner cylinder of the cryogenic liquid container 2 via a guide rail. The inner cylinder of the cryogenic liquid container 2 is placed in a cryogenic liquid, such as liquid nitrogen, liquid helium, etc., and the entire assembly is mounted on the tensile testing device through the cooperation of the end 8 of the tensile flange 1 and the clip for testing.

[0040] Although the above describes the illustrative specific embodiments of the present invention to facilitate technical personnel in this technical field to understand the present invention, and it should be clear that the present invention is not limited to the scope of the specific embodiments, for ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations conceived using the present invention are protected.

Claims

1. A tensile testing device in a low temperature environment, characterized in that: It includes two upper and lower stretching flanges, a cryogenic liquid container, a cryogenic liquid container compression spring, a sealing gasket, a cryogenic liquid container fixing ring, a sensor bracket, and a sensor; the upper and lower stretching flanges are both T-shaped structures; the T-shaped structure includes a horizontal side and an end; The protruding part of the T-shaped structure is an end head, which is used to cooperate with the mechanical testing machine; the connecting block is connected to the lower side of the horizontal side of the T-shaped structure, and the connecting block is a circular ring, which is used to make the stretching flange cooperate with the workpiece under test; the two ends of the workpiece under test are step-shaped structures, and the connecting block is mounted on the outside of the step-shaped structure; the horizontal sides of the T-shaped structure of the upper and lower stretching flanges are fixedly connected to the connecting block by bolts; the bolts pass through the horizontal sides of the T-shaped structure of the upper and lower stretching flanges; nuts are installed on the bolts, which are used to compress the horizontal sides of the T-shaped structure of the upper and lower stretching flanges and the connecting block through the bolts; a low-temperature liquid container compression spring is provided between the horizontal side of the T-shaped structure of the lower stretching flange and the inner bottom wall of the low-temperature liquid container; After the upper and lower stretching flanges are fixed to the test piece, the whole is placed into the cryogenic liquid container through the opening above the cryogenic liquid container, so that the test piece is sleeved in the cryogenic liquid container; the opening at the bottom of the cryogenic liquid container can only pass through the port, thereby blocking the horizontal edge of the T-shaped structure inside the cryogenic liquid container; the upper stretching flange is located at the opening above the cryogenic liquid container, and the horizontal edge of the T-shaped structure of the upper stretching flange can freely pass through the opening above the cryogenic liquid container; the cryogenic liquid container fixing ring is installed on the end head of the lower stretching flange, and a sealing gasket is provided between the cryogenic liquid container fixing ring and the outer bottom wall of the cryogenic liquid container to fix the cryogenic liquid container and maintain sealing; the sensor bracket is installed on the inner wall of the inner cylinder of the cryogenic liquid container through a guide rail, and the sensor is installed on the sensor bracket.

2. The tensile testing device in a low temperature environment according to claim 1, characterized in that: The stretching flange is connected to the measured object through bolts and nuts, so that the stretching flange and the measured object become a tensile whole. The stretching flange is arranged at both ends of the measured object.

3. The tensile testing device in a low temperature environment according to claim 1, characterized in that: The entirety of the stretching flange and the tested piece is placed into the cryogenic liquid container through the opening on the upper side of the cryogenic liquid container.

4. The tensile testing device in a low temperature environment according to claim 1, characterized in that: The lower stretch flange is threadedly connected to the low-temperature liquid container fixing ring, and the low-temperature liquid container compression spring, sealing gasket and low-temperature liquid container fixing ring clamp the lower stretch flange and the low-temperature liquid container to create a seal between the lower stretch flange and the bottom plate of the low-temperature liquid container.

5. The tensile testing device in a low temperature environment according to claim 2, characterized in that: The connecting block is flush with the top of the horizontal side of the T-shaped structure.

6. The tensile testing device in a low temperature environment according to claim 1, characterized in that: The low-temperature liquid container is a hollow two-layer structure, and the middle of the two-layer structure is filled with heat-insulating material.

7. The tensile testing device in a low temperature environment according to claim 1, characterized in that: The sensor bracket and the inner wall of the inner cylinder of the low-temperature liquid container are both provided with guide rails, and the guide rails of the two cooperate with each other.

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