Adjustable bending stress loading test device suitable for strong magnetic field environment

Abstract

The utility model relates to material performance test field, concretely is a kind of adjustable bending stress loading test device suitable for under strong magnetic field environment, including fixed in the sample mounting platform of conduction pole end and with conduction pole extension into magnetic field, rotary installation has stress loading assembly for sample installation on sample mounting platform, the rotary axis of stress loading assembly and the axis of conduction pole are perpendicular to each other;Stress loading assembly includes mounting seat, mounting cavity is opened in mounting seat for sample fixation, and at least two groups of height corresponding positioning step for sample fixation are protruding on mounting seat;Sample and two positioning step form deformation cavity for sample deformation around;Pressure source is provided on mounting seat to sample and applies the pressure of direction down pressure to deformation cavity direction.

Description

Technical Field

[0001] This utility model relates to the field of material performance testing, specifically an adjustable bending stress loading test device suitable for strong magnetic field environments. Background Technology

[0002] In recent years, with the development of thin film materials, low-dimensional materials, and artificial structural materials, controlling material properties through external physical fields has become an important direction in materials research and device development. Mechanical strain, as an effective control method, can influence the electrical, magnetic, and other physical properties of materials by altering their structural state. Therefore, controllable mechanical stress needs to be applied to materials during experiments, combined with electrical testing methods to study changes in material properties. Existing material strain control devices are mainly used under conventional environmental conditions, achieving sample strain loading through stretching, compression, or bending on flexible substrates. However, when conducting in-situ strain control tests in strong magnetic field environments, the limited internal space of the magnetic field equipment, coupled with the requirement for a low magnetic response, small size, and reliable signal transmission capabilities, makes traditional strain loading devices difficult to apply directly. Currently, material testing under strong magnetic field conditions typically employs a fixed sample mounting structure, where the sample primarily performs electrical signal acquisition during testing. This makes it difficult to simultaneously meet the requirements of mechanical strain loading, strain state maintenance, and in-situ transport testing within a compact space, thus necessitating a solution. Utility Model Content

[0003] To avoid and overcome the technical problems existing in the prior art, this utility model provides an adjustable bending stress loading test device suitable for strong magnetic field environments. Within the compact space of a strong magnetic field, this utility model can meet the requirements for mechanical strain loading, strain state maintenance, and in-situ transport testing of materials.

[0004] To achieve the above objectives, this utility model provides the following technical solution: An adjustable bending stress loading test device suitable for strong magnetic field environments includes a sample mounting platform fixed to the end of a transmission rod and extending into the magnetic field along with the transmission rod. A stress loading assembly for sample mounting is rotatably mounted on the sample mounting platform, and the rotation axis of the stress loading assembly is perpendicular to the axis of the transmission rod. The stress loading assembly includes a mounting base with a mounting cavity for sample fixation. At least two sets of positioning steps of corresponding heights are protruding on the mounting base for sample fixation. A deformation cavity for sample deformation is formed between the sample and the two positioning steps. A pressure source is provided on the mounting base to apply downward pressure to the sample towards the deformation cavity. The downward pressure direction of the pressure source is perpendicular to the sample surface, and the downward pressure trajectory of the pressure source is within the projection range of the deformation cavity along the direction perpendicular to the sample surface. A lead wire is disposed inside the transmission rod, and the two ends of the lead wire are connected to the sample and the magnetic field testing equipment, respectively.

[0005] As a further embodiment of this utility model: the pressure source is an adjusting pressure block that slides and cooperates with the mounting base along the direction of the vertical positioning step platform. The adjusting pressure block is provided with at least one set of loading arms that form point contact, line contact or surface contact with the sample. The contact area between the loading arms and the sample is located within the projection range of the deformation cavity.

[0006] As a further embodiment of this utility model: the mounting base is U-shaped, the U-shaped cavity of the mounting base forms a mounting cavity for fixing the sample, a detachable cover plate is installed at the opening of the U-shaped cavity of the mounting base, the platform of the positioning step is arranged parallel to the cover plate, and a threaded hole is opened on the cover plate along the direction perpendicular to the cover plate surface. After the adjusting screw is threaded into the threaded hole, it moves in a straight line to push the adjusting pressure block to slide.

[0007] As a further improvement of this utility model: guide grooves are symmetrically opened on both sides of the U-shaped cavity inside the mounting base along the direction of the vertical positioning step, and sliding seats that engage with the guide grooves are correspondingly protruding on both sides of the adjusting pressure block.

[0008] As a further improvement of this utility model: bolt holes are provided at the four corners of the cover plate, and the cover plate is fixed to the mounting base by bolts through the bolt holes; the adjusting screw is located at the center of the cover plate.

[0009] As a further improvement of this utility model: the mounting base is provided with a rotating shaft that rotates in conjunction with the sample mounting platform, and the axis of the rotating shaft is arranged parallel to the step surface of the positioning step.

[0010] As a further improvement of this utility model: a limiting plate is provided at the end face of the sample mounting platform away from the transmission rod to limit the position of the sample mounting platform, and the plate body is perpendicular to the axis of the transmission rod.

[0011] As a further improvement of this utility model: the transmission rod is a non-magnetic hollow metal rod; the transmission rod is connected and fixed to the connecting angle valve through a mounting flange, and the connecting angle valve is equipped with an aviation plug flange for connecting external equipment.

[0012] As a further improvement of this utility model, a vacuum hole is provided on the mounting flange to perform a vacuuming operation on the transmission rod.

[0013] As a further improvement of this utility model: an electrical signal transmission component is provided on the sample mounting platform, which connects the sample's electrodes to the leads inside the conduction rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model introduces the sample mounting platform into the compact space of a strong magnetic field through a non-magnetic conduction rod. The sample is subjected to pressure by bearing on both ends and pressing down with the loading arm to achieve the set deformation. Within the compact space of the strong magnetic field, the mechanical strain loading, strain state maintenance and in-situ transport testing requirements of the material can be met.

[0015] 2. This invention uses the threaded engagement of an adjusting screw and a threaded hole to drive an adjusting pressure block to slide along a guide groove. This, in turn, applies a vertically downward pressure to the sample via a loading arm. By controlling the amount of screw advance, the bending deformation of the sample can be controlled, thus adjusting the applied bending stress. The stress loading assembly is rotatably mounted on the sample mounting platform via a rotating shaft. Adjusting the rotation angle of the shaft before testing allows for adjustment of the subsequent testing angle of the sample.

[0016] 3. In this invention, the sample is pressed and fixed between the positioning step and the cover plate by the adjusting pressure block, with the middle area of ​​the sample suspended above the deformation cavity. The cooperation between the guide groove and the slide ensures that the movement direction of the adjusting pressure block is precisely controllable, so that the loading position of the loading arm is always within the projection range of the deformation cavity, ensuring the consistency of the loading position. At the same time, the loading arm and the sample can form various contact methods such as point contact, line contact, or surface contact, which can adapt to the testing needs of samples with different materials and surface properties. The contact area between the loading arm and the sample is located within the projection range of the deformation cavity along the direction perpendicular to the sample surface, ensuring that the loading force always acts on the suspended area of ​​the sample, so that the bending deformation of the sample is concentrated in the preset deformation area.

[0017] 4. This utility model has a lead wire inside the transmission rod, with both ends of the lead wire connected to the sample and the magnetic field testing equipment, respectively. Together with the electrical signal transmission component set on the sample mounting platform, it realizes in-situ real-time acquisition of the sample's electrical signal during bending stress loading. A vacuum hole is opened on the mounting flange to perform vacuuming operations on the transmission rod, avoiding the influence of air on the test. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the stress loading component in this utility model.

[0020] In the picture: 1. Connecting angle valve; 2. Mounting flange; 3. Aviation plug flange; 4. Transmission rod; 5. Sample mounting platform; 6. Electrical signal transmission assembly; 7. Stress loading assembly; 71. Mounting base; 711. Positioning step; 712. Guide groove; 713. Rotating shaft; 72. Cover plate; 721. Threaded hole; 722. Adjusting screw; 73. Adjusting pressure block; 731. Loading arm; 732. Slide block; 8. Limit plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-2 In this embodiment of the invention, an adjustable bending stress loading test device suitable for strong magnetic field environments is provided. A connecting angle valve 1 is positioned outside the magnetic field for connection to the external environment. A mounting flange 2 is fixedly mounted on one end of the connecting angle valve 1. One end of a transmission rod 4 passes through the mounting flange 2 and is fixedly connected to the connecting angle valve 1. The other end of the transmission rod 4 extends axially into the strong magnetic field. A sample mounting platform 5 is fixedly mounted on the end of the transmission rod 4 that extends into the magnetic field and extends into the magnetic field along with the transmission rod 4. A stress loading assembly 7 is rotatably mounted on the sample mounting platform 5 for fixed mounting of the sample to be tested. A lead wire passes through the transmission rod 4; one end of the lead wire is connected to the sample, and the other end is connected to the magnetic field testing equipment for transmitting the electrical signal of the sample to the external magnetic field testing equipment.

[0023] A vacuum port is provided on the mounting flange 2, through which a vacuum operation can be performed on the internal space of the transmission rod 4 to ensure that the inside of the transmission rod 4 is in a vacuum state and to avoid interference from air testing. The aviation plug flange 3 is configured on the connecting angle valve 1 for connecting external power sources, equipment, etc.

[0024] The conductive rod 4 is made of a non-magnetic hollow metal rod to ensure the accuracy of the test results. The sample mounting platform 5 is fixed to the end of the conductive rod 4 that extends into the magnetic field. A limiting plate 8 is provided on the end face of the sample mounting platform 5 away from the conductive rod 4, and the body of the limiting plate 8 is perpendicular to the axis of the conductive rod 4. After the limiting plate 8 extends into the magnetic field, it can abut against the setting component to limit the insertion and ensure that the conductive rod 4 is inserted to the set depth. The stress loading assembly 7 is installed on the sample mounting platform 5, and it specifically includes a mounting base 71, a cover plate 72, and an adjusting pressure block 73.

[0025] The mounting base 71 has a U-shaped structure, and the U-shaped cavity of the mounting base 71 forms a mounting cavity for fixing the sample. At least two sets of positioning steps 711 with corresponding heights protrude from the bottom of the U-shaped cavity of the mounting base 71, and the platform of the positioning steps 711 is used to support the two ends of the sample. The sample and the two positioning steps 711 enclose a deformation cavity for sample deformation, that is, the middle area of ​​the sample is suspended between the two positioning steps 711, forming a space for the sample to bend and deform downward.

[0026] A rotating shaft 713 is provided on the mounting base 71, and the rotating shaft 713 is located on both side walls of the mounting base 71. The axis of the rotating shaft 713 is arranged parallel to the step surface of the positioning step 711. The mounting base 71 is rotatably engaged with the sample mounting platform 5 through the rotating shaft 713, so that the stress loading assembly 7 can rotate around the axis of the rotating shaft 713 on the sample mounting platform 5. Through the rotational engagement, the operator can adjust the angle of the stress loading assembly 7 relative to the transmission rod 4 as needed to adapt to the testing requirements at different angles.

[0027] A detachable cover plate 72 is installed at the U-shaped cavity opening of the mounting base 71. Bolt holes are provided at the four corners of the cover plate 72, which is bolted to the mounting base 71, facilitating the removal and installation of the cover plate 72 and thus making it convenient for sample handling. The platform of the positioning step 711 is arranged parallel to the cover plate 72.

[0028] A threaded hole 721 is provided on the cover plate 72 along the direction perpendicular to the surface of the cover plate 72, and the threaded hole 721 is preferably located at the center of the cover plate 72. After the adjusting screw 722 is threaded into the threaded hole 721, the end of the adjusting screw 722 passes through the threaded hole 721 and enters the interior of the mounting cavity, and moves in a straight line to push the adjusting pressure block 73 to slide along the direction of the vertical positioning step 711 platform.

[0029] Guide grooves 712 are symmetrically formed on both sides of the U-shaped cavity inside the mounting base 71 along the direction of the vertical positioning step 711. Slide seats 732 are correspondingly protruding on both sides of the adjusting block 73, engaging with the guide grooves 712. The adjusting block 73 slides within the mounting base 71 along the surface of the vertical positioning step 711 through the sliding engagement of the slide seats 732 and the guide grooves 712.

[0030] At least one set of loading arms 731 protrudes from the adjusting block 73. The loading arms 731 form point contact, line contact, or surface contact with the sample, and the contact area between the loading arms 731 and the sample is located within the projection range of the deformation cavity along the direction perpendicular to the sample surface. When the adjusting screw 722 is screwed downward, the adjusting screw 722 pushes the adjusting block 73 to slide downward, and the loading arms 731 on the adjusting block 73 move downward accordingly, applying pressure to the sample in the direction of the deformation cavity. The direction of this pressure is perpendicular to the sample surface, that is, the loading arms 731 apply a vertically downward bending load to the sample. Since the contact area between the loading arms 731 and the sample is located within the projection range of the deformation cavity, after the sample is subjected to downward pressure, its middle region bends and deforms downward, while the two ends of the sample are supported by the positioning steps 711, thereby realizing the bending stress loading on the sample.

[0031] The downward displacement of the adjusting block 73 can be controlled by rotating the adjusting screw 722, thereby adjusting the magnitude of the bending stress applied to the sample and achieving adjustable bending stress loading. In this embodiment, there are two sets of loading arms 731, which are arranged at intervals along the width direction of the sample. The ends of the loading arms 731 are provided with arc-shaped contact surfaces, and the loading arms 731 form line contact with the sample through the arc-shaped contact surfaces.

[0032] All leads used for testing are made of low thermal conductivity materials, and the tested samples include thin film materials on flexible substrates and rigid oxide substrates. The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the specific details described above.

[0033] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

Claims

1. An adjustable bending stress loading test device suitable for strong magnetic field environments, characterized in that, The sample mounting platform (5) is fixed to the end of the transmission rod (4) and extends into the magnetic field along with the transmission rod (4). A stress loading assembly (7) for sample mounting is rotatably mounted on the sample mounting platform (5). The rotation axis of the stress loading assembly (7) is perpendicular to the axis of the transmission rod (4). The stress loading assembly (7) includes a mounting base (71). The mounting base (71) has a mounting cavity for sample fixing. At least two sets of positioning steps (711) with corresponding heights are protruding on the mounting base (71) for sample fixing. The sample and the two positioning steps (711) enclose a deformation cavity for sample deformation. A pressure source is provided on the mounting base (71) to apply downward pressure to the sample in the direction of the deformation cavity. The downward pressure direction of the pressure source is perpendicular to the sample surface, and the downward pressure trajectory of the pressure source is located within the projection range of the deformation cavity along the direction perpendicular to the sample surface. A lead wire is provided in the transmission rod (4). The two ends of the lead wire are connected to the sample and the magnetic field testing equipment, respectively.

2. The adjustable bending stress loading test device suitable for strong magnetic field environments according to claim 1, characterized in that, The pressure source is an adjusting block (73) that slides with the mounting base (71) along the vertical positioning step (711) platform direction. The adjusting block (73) is provided with at least one set of loading arms (731) that make point contact, line contact or surface contact with the sample. The contact area between the loading arm (731) and the sample is located within the projection range of the deformation cavity.

3. The adjustable bending stress loading test device suitable for strong magnetic field environments according to claim 2, characterized in that, The mounting base (71) is a U-shaped body. The U-shaped cavity of the mounting base (71) forms a mounting cavity for fixing the sample. A detachable cover plate (72) is installed at the opening of the U-shaped cavity of the mounting base (71). The platform of the positioning step (711) is arranged parallel to the cover plate (72). A threaded hole (721) is opened on the cover plate (72) along the direction perpendicular to the surface of the cover plate (72). After the adjusting screw (722) is threaded into the threaded hole (721), it moves in a straight line to push the adjusting pressure block (73) to slide.

4. The adjustable bending stress loading test device suitable for strong magnetic field environments according to claim 3, characterized in that, The mounting base (71) has guide grooves (712) symmetrically opened on both sides of the U-shaped cavity along the direction of the vertical positioning step (711), and the adjusting block (73) has corresponding sliding seats (732) protruding on both sides to engage with the guide grooves (712).

5. The adjustable bending stress loading test device suitable for strong magnetic field environments according to claim 3, characterized in that, The cover plate (72) has bolt holes at its four corners, which are bolted to the mounting base (71); the adjusting screw (722) is located at the center of the cover plate (72).

6. An adjustable bending stress loading test device suitable for strong magnetic field environments according to any one of claims 1 to 5, characterized in that, The mounting base (71) is provided with a rotating shaft (713) that rotates with the sample mounting platform (5). The axis of the rotating shaft (713) is arranged parallel to the step surface of the positioning step (711).

7. An adjustable bending stress loading test device suitable for strong magnetic field environments according to any one of claims 1 to 5, characterized in that, A limiting plate (8) is provided at the end face of the sample mounting platform (5) away from the guide rod (4) to limit the sample mounting platform (5). The plate body of the limiting plate (8) is perpendicular to the axis of the guide rod (4).

8. An adjustable bending stress loading test device suitable for strong magnetic field environments according to any one of claims 1 to 5, characterized in that, The transmission rod (4) is a non-magnetic hollow metal rod; the transmission rod (4) is connected and fixed to the connecting angle valve (1) through the mounting flange (2), and the connecting angle valve (1) is equipped with an aviation plug flange (3) to connect to external equipment.

9. The adjustable bending stress loading test device suitable for strong magnetic field environments according to claim 8, characterized in that, The mounting flange (2) is provided with a vacuum hole to perform a vacuuming operation on the transmission rod (4).

10. An adjustable bending stress loading test device suitable for strong magnetic field environments according to any one of claims 1 to 5, characterized in that, An electrical signal transmission component (6) is provided on the sample mounting platform (5). The electrical signal transmission component (6) connects the sample electrodes to the leads inside the conduction rod (4).

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