Device for measuring changes in magnetic properties of a material during compression

Abstract

The application relates to a device for measuring the change of a magnetic index of a material during compression, which comprises a magnetic shielding cylinder, a pressure applying assembly arranged at a distance from the magnetic shielding cylinder, the pressure applying assembly comprising a first clamping piece and a second clamping piece hinged in an X shape in a vertical plane, the parts of the pressure applying assembly located on both sides of the hinge point of the first clamping piece and the second clamping piece being a clamping section and a force applying section respectively, the clamping section being at least partially located in the magnetic shielding cylinder, the part of the clamping section located in the magnetic shielding cylinder being made of a material satisfying the condition that the residual magnetism of the material is less than or equal to 0.5 nT when the residual magnetism measuring distance is 2 cm, the force applying section being located outside the magnetic shielding cylinder, a magnetic index monitoring meter comprising a probe, the probe being located in the magnetic shielding cylinder, a counterforce frame and an actuator arranged on the counterforce frame, both being located outside the magnetic shielding cylinder, the counterforce frame and the actuator jointly constraining the force applying section of the pressure applying assembly, and the actuator being capable of making the first clamping piece and the second clamping piece close. The device can measure the change of the magnetic index of the material during compression.

Description

Technical Field

[0001] This application relates to the field of weak magnetic field measurement technology, and in particular to a device for measuring the changes in the magnetic properties of materials under pressure. Background Technology

[0002] With the development of modern science and technology, the engineering demand for non-magnetic functional building materials has significantly increased in many fields. In the field of precision scientific facilities, the operating environment of special facilities such as geomagnetic observatories, magnetic resonance imaging (MRI) equipment, and the Large Hadron Collider (LHC) must strictly limit the presence of magnetic interference sources to avoid the influence of environmental magnetic fields on measurements or experiments. A common characteristic of these facilities is that their functionality relies on the extremely weak magnetic environment provided by a "zero-magnetic" space to ensure the accuracy and reliability of research results. To achieve these technical goals, the performance parameters of non-magnetic materials must be strictly limited. Besides permeability, the control of magnetic indices such as remanence and magnetic noise is particularly critical. In some sensitive measurement devices, the remanence of the building structure is even required to be below 1 nT. During construction and use, non-magnetic structures are under constant pressure, and the materials are inevitably affected by stress. Due to changes in microstructure and other factors, the remanence of the material itself will change, which will affect the use of the "zero-magnetic" space. Therefore, measuring the changes in the magnetic indices of materials under pressure is of great significance for constructing "zero-magnetic" spaces.

[0003] Currently, devices for measuring the magnetic properties of materials are typically static measurements, where the sample is not subjected to pressure during the measurement process. Therefore, it is necessary to propose a device capable of measuring changes in the magnetic properties of materials under pressure. Utility Model Content

[0004] Therefore, it is necessary to provide a device for measuring the changes in the magnetic properties of a material during compression, in order to address the above problems.

[0005] To address the above problems, this application provides the following technical solution:

[0006] A device for measuring the change in magnetic properties of a material under pressure, the device comprising:

[0007] Magnetic shielding cylinder;

[0008] A pressure-applying assembly is spaced apart from the magnetic shielding cylinder. The pressure-applying assembly includes a first clamping member and a second clamping member hinged in an X-shape in a vertical plane. The portions of the pressure-applying assembly located on either side of the hinge point of the first and second clamping members are respectively a clamping section and a force-applying section. The clamping section is at least partially located inside the magnetic shielding cylinder. The portion of the clamping section inside the magnetic shielding cylinder is made of a material that satisfies the following conditions: when the remanent magnetization measurement distance is 2 cm, the remanent magnetization of the material is less than or equal to 0.5 nT; the clamping section has a support position for supporting the sample being tested; the force-applying section is located outside the magnetic shielding cylinder.

[0009] A magnetic index monitor includes a monitor body and a probe, wherein the monitor body is located outside the magnetic shielding cylinder and the probe is located inside the magnetic shielding cylinder;

[0010] The reaction frame and the actuator disposed on the reaction frame are both located outside the magnetic shielding cylinder; the reaction frame and the actuator jointly constrain the force application section of the pressure application component so that the pressure application component is suspended in the air; the actuator can cause the first clamping member and the second clamping member to close together to clamp the sample to be tested on the support position.

[0011] The device for measuring changes in the magnetic properties of a material under pressure has at least the following beneficial effects:

[0012] During the use of this device, the sample to be tested is first placed on the support position. Then, the actuator gradually closes the first and second clamping parts, thereby clamping the sample and applying pressure. A magnetic index monitor continuously measures the magnetic index of the sample, thus measuring the change in the magnetic index during the pressure process. Therefore, this device can measure the change in the magnetic index of a material during pressure. Furthermore, the pressure-applying component and the magnetic shielding cylinder are spaced apart, and the actuator is located outside the magnetic shielding cylinder. Therefore, during the pressure application process, neither the pressure-applying component nor the actuator exerts any force on the magnetic shielding cylinder. This prevents the magnetic shielding cylinder from being subjected to force, causing changes in the internal magnetic field, which helps ensure the measurement accuracy of the device. Although the clamping section is at least partially located inside the magnetic shielding cylinder and is subject to the reaction force of the sample, the portion of the clamping section inside the magnetic shielding cylinder is made of a material that meets the following condition: at a remanent magnetization measurement distance of 2 cm, the remanent magnetization of the material is less than or equal to 0.5 nT. Therefore, the magnetic field interference caused by the force applied to the clamping section is negligible.

[0013] In one embodiment, the magnetic shielding cylinder is provided with a clearance hole, the pressure application component passes through the clearance hole, and the hinge point of the first clamping member and the second clamping member is located inside the clearance hole.

[0014] This design helps to reduce the size of the clearance hole and ensures the magnetic shielding performance of the magnetic shielding cylinder.

[0015] In one embodiment, the portion of the clamping section located on the first clamping member is a first clamping part, and the portion of the clamping section located on the second clamping member is a second clamping part. The first clamping part is located below the second clamping part. A support position is formed on the top side of the portion of the first clamping part away from the force-applying section. The support position is located in the same horizontal plane, and the first clamping member is fixed to the reaction frame.

[0016] With this setup, the support position is always horizontal, which helps to stably support the sample being tested.

[0017] In one embodiment, the first clamping part includes a first clamping rod and a support plate. The first clamping rod is connected to the force-applying section, and the support plate is disposed at the end of the first clamping rod away from the force-applying section. The top side of the support plate forms the support position. Along the axial direction of the first clamping member relative to the rotation axis of the second clamping member, the size of the support position is larger than the size of the first clamping rod.

[0018] This design offers several advantages. First, the larger support area facilitates the support of the sample being tested. Second, the smaller size of the first clamping rod reduces the size of the hinge point between the first and second clamping members, thereby reducing the size of the clearance hole and ensuring the magnetic shielding performance of the magnetic shielding cylinder.

[0019] In one embodiment, the second clamping part includes a second clamping rod part, a first ball joint and a first loading plate. The second clamping rod part is connected to the force application section. The first loading plate is connected to the second clamping rod part through the first ball joint and is located below the second clamping rod part. The first loading plate is disposed corresponding to the support position, and the bottom side of the first loading plate is located in the same plane.

[0020] This configuration allows the sample to be manufactured in a cylindrical shape, with its top and bottom sides parallel to each other. After the sample is placed in the support position, its top side lies in the horizontal plane. After the clamping section clamps the sample, the bottom side of the first loading plate automatically aligns with the top side of the sample, which facilitates the application of pressure to the sample stably and evenly by the pressure-applying assembly.

[0021] In one embodiment, the portion of the force-applying segment located on the first clamping member is the first force-applying part, and the portion of the force-applying segment located on the second clamping member is the second force-applying part. The first force-applying part is located above the second force-applying part. The second force-applying part includes a second force-applying rod, a second ball joint, and a second loading plate. The second force-applying rod is connected to the clamping segment. The second loading plate is connected to the second force-applying rod via the second ball joint and is located below the second force-applying rod. The bottom side of the second loading plate is located in the same plane. The actuator has a liftable actuator, which is disposed corresponding to the second loading plate and located below the second loading plate. The top side of the actuator is located in the same horizontal plane. The actuator is used to lift the second loading plate so that the first clamping member and the second clamping member close together.

[0022] With this configuration, if there are no other structures (such as the force sensor described below) between the top side of the actuator and the bottom side of the second loading plate, the top side of the actuator will directly contact the bottom side of the second loading plate during the process of the actuator lifting the second loading plate, thereby causing the bottom side of the second loading plate to automatically adhere to the top side of the actuator. This is beneficial for the pressure application component to be stably and evenly subjected to the force applied by the actuator.

[0023] If there are other structures (such as the force sensor described below) between the top side of the actuator and the bottom side of the second loading plate, as long as the top and bottom sides of such structures are parallel to each other, the top side of such structures will also be located in the same horizontal plane after being placed on the top side of the actuator. During the process of the actuator lifting the second loading plate, the top side of such structures comes into contact with the bottom side of the second loading plate, thereby causing the bottom side of the second loading plate to automatically adhere to the top side of such structures. This still helps the pressure application assembly to be stably and uniformly subjected to the force applied by the actuator.

[0024] In one embodiment, the second ball joint is disposed near the end of the second force-applying rod that is away from the clamping section.

[0025] With this configuration, the distance between the second ball joint and the hinge point of the first and second clamping members is relatively large. In other words, the lever arm of the force exerted by the actuator on the second force-applying part is relatively large. According to the lever principle, this helps to reduce the force that the actuator needs to apply and reduces the burden on the actuator.

[0026] In one embodiment, the device for measuring the change in magnetic properties of the material during compression further includes a force sensor, the top and bottom sides of which are parallel to each other, and the force sensor is placed on the top side of the actuator.

[0027] With this configuration, during the process of the actuator lifting the second loading plate, the force sensor is sandwiched between the actuator and the second loading plate. The top side of the actuator does not contact the bottom side of the second loading plate, and the force exerted by the actuator is transmitted to the second loading plate through the force sensor. This allows the force sensor to detect the applied force and calculate the pressure on the sample. Furthermore, after the force sensor is placed on the top side of the actuator, its top side is also located on the same horizontal plane. During the process of the actuator lifting the second loading plate, the top side of the force sensor contacts the bottom side of the second loading plate, causing the bottom side of the second loading plate to automatically align with the top side of the force sensor. This still helps the pressure application assembly to receive the force applied by the actuator stably and evenly.

[0028] In one embodiment, the second force-applying rod includes a first rod segment and a second rod segment, the first rod segment being relatively close to the clamping segment and the second rod segment being relatively far from the clamping segment, the second rod segment being detachably connected to the first rod segment, and the second ball joint being disposed on the second rod segment.

[0029] With this configuration, before inserting the pressure-applying component into the clearance hole, the second rod segment is removed, along with the second ball joint and the second loading plate. Then, with the first and second clamping members closed, the pressure-applying component is gradually inserted through the clearance hole from inside the magnetic shielding cylinder to the outside until the hinge point of the first and second clamping members is located within the clearance hole. Afterward, the second rod segment is assembled onto the first rod segment. This facilitates assembly of the device and allows for a smaller clearance hole.

[0030] In one embodiment, the length of the force-applying segment is greater than the length of the clamping segment, and the actuator is positioned near the portion of the force-applying segment that is far from the clamping segment.

[0031] According to the lever principle, this configuration helps to reduce the force that the actuator needs to apply, thus reducing the burden on the actuator. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a device for measuring the change of magnetic properties of a material under pressure, according to an embodiment of this application, for measuring the sample under test.

[0033] Figure 2 This is a three-dimensional schematic diagram of a portion of the structure of a device for measuring the change of magnetic properties of a material under pressure, according to an embodiment of this application.

[0034] Figure 3 This is a perspective view of a pressure application component according to an embodiment of this application;

[0035] Figure 4This is an exploded schematic diagram of a portion of the structure of a device for measuring the change in magnetic properties of a material under pressure, according to an embodiment of this application.

[0036] Figure label:

[0037] 1. Magnetic shielding cylinder; 11. Cylinder body; 111. Clearance hole; 12. Cylinder cover; 2. Pressure application assembly; 21. First clamping member; 211. First clamping part; 2111. First clamping rod part; 2112. Support plate; 21121. Support position; 212. First force application part; 2121. First force application rod part; 2122. Connecting plate; 22. Second clamping member; 221. Second clamping part; 2211. Second clamping rod part; 2212. First ball joint; 2213. First loading plate; 222. Second force application part; 2221. Second force application part; Force rod section; 22211, first rod segment; 22212, second rod segment; 2222, second ball joint; 2223, second loading plate; 23, clamping section; 24, force application section; 3, magnetic index monitor; 31, monitor body; 32, probe; 33, sensor wire; 4, reaction frame; 5, actuator; 51, actuator; 6, force sensor; 7, sample under test; 10, hydraulic oil pipe; 20, hand-cranked oil pump; 30, high-pressure connector; 40, pressure gauge; 50, pad; 60, pad block; 70, data acquisition instrument; 80, computer. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0044] See Figures 1 to 4 This application provides a device for measuring the change of magnetic properties of a material during compression (hereinafter referred to as the device). The device includes a magnetic shielding cylinder 1, a pressure application component 2, a magnetic property monitoring meter 3, a reaction frame 4, and an actuator 5.

[0045] See Figure 1 and Figure 3The pressure-applying component 2 is spaced apart from the magnetic shielding cylinder 1. The pressure-applying component 2 includes a first clamping member 21 and a second clamping member 22 that are hinged in an X-shape in a vertical plane. The pressure-applying component 2 is located at the hinge point of the first clamping member 21 and the second clamping member 22 (i.e., Figure 1 and Figure 3 The portions on either side of the intersection of the first clamping member 21 and the second clamping member 22 are respectively the clamping section 23 and the force-applying section 24. The clamping section 23 is at least partially located inside the magnetic shielding cylinder 1. The portion of the clamping section 23 inside the magnetic shielding cylinder 1 is made of a material that satisfies the following condition: when the remanent magnetization measurement distance is 2 cm, the remanent magnetization of the material is less than or equal to 0.5 nT. The clamping section 23 is provided with support positions 21121 for supporting the sample 7 being tested. The force-applying section 24 is located outside the magnetic shielding cylinder 1.

[0046] The magnetic index monitor 3 is used to measure the magnetic index of the sample 7 being tested. (See reference...) Figure 1 and Figure 2 The magnetic index monitoring meter 3 includes a monitoring meter body 31 and a probe 32. The monitoring meter body 31 is located outside the magnetic shielding cylinder 1, and the probe 32 is located inside the magnetic shielding cylinder 1.

[0047] See Figure 1 Both the reaction frame 4 and the actuator 5 are located outside the magnetic shielding cylinder 1, with the actuator 5 mounted on the reaction frame 4. The reaction frame 4 and the actuator 5 together constrain the force application section 24 of the pressure application assembly 2, so that the pressure application assembly 2 is suspended in the air. The actuator 5 can cause the first clamping member 21 and the second clamping member 22 to close, so as to clamp the sample 7 to be tested on the support position 21121.

[0048] During the use of this device, the sample 7 to be tested is first placed on the support position 21121. Then, the actuator 5 is used to gradually close the first clamping member 21 and the second clamping member 22, thereby clamping the sample 7 in the clamping section 23, thus subjecting the sample 7 to pressure. The magnetic index monitor 3 continuously measures the magnetic index of the sample 7, thereby measuring the change in the magnetic index of the sample 7 during the pressure process. Therefore, this device can measure the change in the magnetic index of the material during the pressure process. Moreover, the pressure application component 2 is spaced apart from the magnetic shielding cylinder 1, and the actuator 5 is located outside the magnetic shielding cylinder 1. Therefore, during the pressure application process on the sample 7, neither the pressure application component 2 nor the actuator 5 exerts any force on the magnetic shielding cylinder 1. This prevents the magnetic shielding cylinder 1 from being subjected to force and causing changes in the internal magnetic field of the magnetic shielding cylinder 1, which helps to ensure the measurement accuracy of the device. Although the clamping section 23 is at least partially located inside the magnetic shielding cylinder 1 and will be subject to the reaction force of the sample 7 being tested, the magnetic field interference caused by the clamping section 23 being subjected to force can be ignored because the part of the clamping section 23 located inside the magnetic shielding cylinder 1 is made of a material that satisfies the following condition: when the remanent magnetization measurement distance is 2cm, the remanent magnetization of the material is less than or equal to 0.5nT.

[0049] For example, the portion of the clamping section 23 located inside the magnetic shielding cylinder 1 is made of low magnetic materials such as 10Cr18Mn20Ni2N low magnetic stainless steel and Nitronic 50 low magnetic stainless steel.

[0050] exist Figure 1 In the illustrated embodiment, the entire clamping section 23 is located inside the magnetic shielding cylinder 1. In other embodiments, only a portion of the clamping section 23 may be located inside the magnetic shielding cylinder 1.

[0051] Understandably, a hole must be made in the magnetic shielding cylinder 1 for the pressure application component 2 to pass through. The larger this hole is, the more it impairs the magnetic shielding performance of the magnetic shielding cylinder 1. When the pressure application component 2 is open, the space occupied by the hinge point of the first clamping member 21 and the second clamping member 22 is minimized.

[0052] See Figure 1 and Figure 2 The magnetic shielding cylinder 1 has a clearance hole 111, through which the pressure application component 2 passes. The hinge point of the first clamping member 21 and the second clamping member 22 is located within the clearance hole 111. In other words, the part of the pressure application component 2 that occupies the least space is located within the clearance hole 111. This helps to reduce the size of the clearance hole 111 and helps to ensure the magnetic shielding performance of the magnetic shielding cylinder 1.

[0053] See Figure 1 The portion of clamping segment 23 located on the first clamping member 21 is the first clamping part 211, and the portion of clamping segment 23 located on the second clamping member 22 is the second clamping part 221. The first clamping part 211 is located below the second clamping part 221. (See reference...) Figure 3 The top side of the portion of the first clamping part 211 away from the force-applying section 24 forms a support position 21121, which is located in the same horizontal plane. The first clamping member 21 is fixed to the reaction frame 4. In this way, the support position 21121 is always horizontal, which is beneficial for stably supporting the sample 7 being tested.

[0054] In other embodiments, a groove may be provided on the top side of the first clamping part 211, and the lower part of the sample 7 to be tested may be manufactured into a shape that conforms to the groove. During the measurement process, the sample 7 to be tested is inserted into the groove of the first clamping part 211.

[0055] See Figure 3The first clamping part 211 includes a first clamping rod part 2111 and a support plate 2112. The first clamping rod part 2111 is connected to the force-applying section 24, and the support plate 2112 is located at the end of the first clamping rod part 2111 away from the force-applying section 24. A support position 21121 is formed on the top side of the support plate 2112. Along the axial direction of the rotation axis of the first clamping member 21 relative to the second clamping member 22, the size of the support position 21121 is larger than the size of the first clamping rod part 2111. On the one hand, the larger size of the support position 21121 facilitates the support of the sample 7 to be tested. On the other hand, the smaller size of the first clamping rod part 2111 helps to reduce the size of the part where the hinge point of the first clamping member 21 and the second clamping member 22 is located, thereby helping to reduce the size of the clearance hole 111, and thus helping to ensure the magnetic shielding performance of the magnetic shielding cylinder 1.

[0056] See Figure 3 The second clamping part 221 includes a second clamping rod part 2211, a first ball joint 2212, and a first loading plate 2213. The second clamping rod part 2211 is connected to the force application section 24. The first loading plate 2213 is connected to the second clamping rod part 2211 via the first ball joint 2212 and is located below the second clamping rod part 2211. The first loading plate 2213 is disposed corresponding to the support position 21121, and the bottom side of the first loading plate 2213 is located in the same plane. In this application, the sample 7 to be tested can be manufactured into a cylindrical shape, with the top and bottom sides of the sample 7 being parallel to each other. After the sample 7 to be tested is placed in the support position 21121, the top side of the sample 7 to be tested is located in the horizontal plane. After the clamping section 23 clamps the sample 7 to be tested, the bottom side of the first loading plate 2213 automatically fits against the top side of the sample 7 to be tested, which is beneficial for the pressure application component 2 to apply pressure to the sample 7 to be tested stably and evenly.

[0057] Preferably, the first loading plate 2213 has a regular structure, and the first ball joint 2212 is connected to the centroid of the top side of the first loading plate 2213. In this way, the bottom side of the first loading plate 2213 is in a horizontal plane in its natural state, and when the pressure applying component 2 first applies pressure to the sample 7, the bottom side of the first loading plate 2213 is already in contact with the top side of the sample 7. In other words, when the pressure applying component 2 first applies pressure to the sample 7, it can apply pressure to the sample 7 stably and uniformly.

[0058] See Figure 3 The bottom side of the first loading plate 2213 is conformally adapted to the support position 21121.

[0059] See Figure 3 The bottom side of the first loading plate 2213 and the support position 21121 are the same square. In other embodiments, the bottom side of the first loading plate 2213 and the support position 21121 may also be the same circle or other shapes.

[0060] See Figure 1 The portion of the force-applying section 24 located on the first clamping member 21 is the first force-applying part 212, and the portion of the force-applying section 24 located on the second clamping member 22 is the second force-applying part 222. The first force-applying part 212 is located above the second force-applying part 222. (See also...) Figure 3 The second force-applying part 222 includes a second force-applying rod 2221, a second ball joint 2222, and a second loading plate 2223. The second force-applying rod 2221 is connected to the clamping section 23. The second loading plate 2223 is connected to the second force-applying rod 2221 via the second ball joint 2222 and is located below the second force-applying rod 2221. The bottom side of the second loading plate 2223 is in the same plane. The actuator 5 has a liftable actuator 51, which is disposed corresponding to the second loading plate 2223 and located below the second loading plate 2223. The top side of the actuator 51 is in the same horizontal plane. The actuator 51 is used to lift the second loading plate 2223 so that the first clamping member 21 and the second clamping member 22 close together.

[0061] If there is no other structure (such as the force sensor 6 described below) between the top side of the actuator 51 and the bottom side of the second loading plate 2223, the top side of the actuator 51 will directly contact the bottom side of the second loading plate 2223 during the process of the actuator 51 lifting the second loading plate 2223, thereby causing the bottom side of the second loading plate 2223 to automatically adhere to the top side of the actuator 51. This is beneficial for the pressure application assembly 2 to be stably and evenly subjected to the force applied by the actuator 5.

[0062] If there are other structures (such as the force sensor 6 described below) between the top side of the actuator 51 and the bottom side of the second loading plate 2223, as long as the top and bottom sides of such structures are parallel to each other, the top side of such structures will also be located in the same horizontal plane after the actuator 51 is placed on the top side. During the process of the actuator 51 lifting the second loading plate 2223, the top side of such structures contacts the bottom side of the second loading plate 2223, thereby causing the bottom side of the second loading plate 2223 to automatically adhere to the top side of such structures. This still helps the pressure application assembly 2 to be stably and uniformly subjected to the force applied by the actuator 5.

[0063] Preferred options, please refer to Figure 3 The second ball joint 2222 is positioned near the end of the second force-applying rod 2221 away from the clamping section 23. This results in a larger distance between the second ball joint 2222 and the hinge points of the first clamping member 21 and the second clamping member 22. In other words, the lever arm of the force exerted by the actuator 5 on the second force-applying part 222 is larger. According to the lever principle, this helps reduce the force required by the actuator 5 and alleviates the burden on the actuator 5.

[0064] exist Figure 4In the illustrated embodiment, actuator 5 is a jack, and actuator 51 is the jack's push rod. The jack is connected to a hydraulic oil pipe 10 and a hand-cranked oil pump 20. High-pressure connectors 30 are installed at both ends of the hydraulic oil pipe 10, and a pressure gauge 40 is connected to the side of the hand-cranked oil pump 20. After installation, the push rod of the jack can be driven to rise by the hand-cranked oil pump 20, and then the push rod pushes the second loading plate 2223 upward, thereby causing the first clamping member 21 and the second clamping member 22 to gradually close.

[0065] In other embodiments, the actuator 5 may also be a hydraulic cylinder or an electric cylinder. In these embodiments, the actuator 5 is vertically arranged, and the actuator 51 is a piston rod.

[0066] The actuator 5 can be fixed to the reaction frame 4 or placed on the reaction frame 4.

[0067] See Figure 1 and Figure 4 The device for measuring the change in magnetic properties of a material under pressure also includes a force sensor 6. The top and bottom sides of the force sensor 6 are parallel to each other, and the force sensor 6 is placed on the top side of the actuator 51. During the process of the actuator 51 lifting the second loading plate 2223, the force sensor 6 is sandwiched between the actuator 51 and the second loading plate 2223. The top side of the actuator 51 does not contact the bottom side of the second loading plate 2223, and the force exerted by the actuator 51 is transmitted to the second loading plate 2223 through the force sensor 6. In this way, the force applied by the force sensor 6 can be obtained, thereby calculating the pressure on the sample 7 being tested. Moreover, after the force sensor 6 is placed on the top side of the actuator 51, the top side of the force sensor 6 is also located in the same horizontal plane. During the process of the actuator 51 lifting the second loading plate 2223, the top side of the force sensor 6 contacts the bottom side of the second loading plate 2223, thereby causing the bottom side of the second loading plate 2223 to automatically adhere to the top side of the force sensor 6. This still helps the pressure application assembly 2 to be stably and evenly subjected to the force applied by the actuator 5.

[0068] Specifically, the distance L1 from the connection point of the second ball joint 2222 and the second force-applying rod 2221 to the hinge point of the first clamping member 21 and the second clamping member 22 is known. After the sample 7 is placed in the support position 21121, the distance L2 from the contact point between the sample 7 and the second clamping rod 2211 to the hinge point of the first clamping member 21 and the second clamping member 22 is also known. If the force measured by the force sensor 6 is F1, according to the lever principle, the pressure F2 on the sample 7 can be calculated by the following formula: F2 = F1L1 / L2.

[0069] See Figure 1 and Figure 4The apparatus for measuring the change of magnetic index of a material during the compression process further includes a data acquisition instrument 70 and a computer 80. The force sensor 6 is connected to the data acquisition instrument 70 via a cable, and the data acquisition instrument 70 is connected to the computer 80. Software matching the data acquisition instrument 70 is installed on the computer 80, and the calculation process of F2 is automatically completed by the software.

[0070] It is worth noting that, in order to work normally and generate signals, the vast majority of force sensors 6 have current during operation, so the magnetic field near the force sensor 6 will be affected when the force sensor 6 is working. In the present application, the force sensor 6 is located outside the magnetic shielding cylinder 1, which prevents the current in the force sensor 6 from interfering with the magnetic field inside the magnetic shielding cylinder 1 and reducing the measurement accuracy.

[0071] In short, this apparatus skillfully obtains the pressure applied to the tested sample 7, thereby preventing the current in the force sensor 6 from interfering with the magnetic field inside the magnetic shielding cylinder 1 and reducing the measurement accuracy.

[0072] Preferably, the second loading plate 2223 is a regular structure, and the second ball hinge 2222 is connected to the centroid of the top side of the second loading plate 2223. In this way, the bottom side of the second loading plate 2223 is in a horizontal plane in a natural state, and when the actuator 5 initially applies a force to the pressing assembly 2, the bottom side of the second loading plate 2223 is already attached to the top side of the force sensor 6 or the top side of the actuating member 51. In other words, when the actuator 5 initially applies a force to the pressing assembly 2, the pressing assembly 2 can receive the force applied by the actuator 5 stably and uniformly.

[0073] Refer to Figure 3 , the second force applying rod portion 2221 includes a first rod segment 22211 and a second rod segment 22212. The first rod segment 22211 is relatively close to the clamping section 23, the second rod segment 22212 is relatively far from the clamping section 23, the second rod segment 22212 is detachably connected to the first rod segment 22211, and the second ball hinge 2222 is disposed on the second rod segment 22212. Before the pressing assembly 2 is passed through the avoiding hole 111, the second rod segment 22212 is removed, and the second ball hinge 2222 and the second loading plate 2223 are also removed together with the second rod segment 22212. Then, in the state where the first clamping member 21 and the second clamping member 22 are closed, the pressing assembly 2 is gradually passed through the avoiding hole 111 from the inside of the magnetic shielding cylinder 1 to the outside of the magnetic shielding cylinder 1 until the hinge point of the first clamping member 21 and the second clamping member 22 is located in the avoiding hole 111. After that, the second rod segment 22212 is assembled to the first rod segment 22211. In this way, the apparatus is convenient to assemble and facilitates making the avoiding hole 111 smaller.

[0074] Refer to Figure 3The first force-applying part 212 includes a first force-applying rod part 2121 and a connecting plate 2122. The connecting plate 2122 is fixedly connected to the reaction frame 4 and detachably connected to the first force-applying rod part 2121. Along the axial direction of the rotation axis of the first clamping member 21 relative to the second clamping member 22, the size of the connecting plate 2122 is larger than the size of the first force-applying rod part 2121. Similarly, the connecting plate 2122 is removed before the pressure-applying assembly 2 is inserted into the clearance hole 111. Then, with the first clamping member 21 and the second clamping member 22 in the closed state, the pressure-applying assembly 2 is lowered and gradually passes through the clearance hole 111 from inside the magnetic shielding cylinder 1 to outside the magnetic shielding cylinder 1 until the hinge point of the first clamping member 21 and the second clamping member 22 is located inside the clearance hole 111. After that, the connecting plate 2122 is assembled onto the first force-applying rod part 2121. This facilitates the assembly of the device and allows for a smaller clearance hole 111.

[0075] For example, the second rod segment 22212 is threaded to the first rod segment 22211, and the connecting plate 2122 is threaded to the first force-applying rod 2121.

[0076] Preferably, the length of the force-applying section 24 is greater than the length of the clamping section 23, and the actuator 5 is positioned closer to the force-applying section 24 and further away from the clamping section 23. According to the lever principle, this helps to reduce the force that the actuator 5 needs to apply, and thus reduces the burden on the actuator 5.

[0077] The sample 7 being tested can be cast from mortar or concrete, or made from metal or composite materials.

[0078] The specific type of magnetic index monitor 3 depends on the measurement requirements. For example, the magnetic index monitor 3 can be a fluxgate magnetometer, a SERF atomic magnetometer, or a digital permeability meter.

[0079] See Figure 1 and Figure 2 The magnetic index monitor 3 has a sensing line 33, one end of which is connected to the probe 32 and the other end is connected to the monitor body 31.

[0080] See Figure 1 and Figure 2 The magnetic shielding cylinder 1 includes a cylinder body 11 and a cylinder cover 12. The cylinder body 11 has an opening, and the cylinder cover 12 is rotatably connected to the cylinder body 11 for opening and closing the opening. A clearance hole 111 is provided on one side of the cylinder body 11 and the cylinder cover 12, and a sensing wire 33 passes through the cylinder cover 12.

[0081] See Figure 2The magnetic shielding cylinder 1 is equipped with a pad 50 and a pad 60, which are made of a material with a remanence of less than or equal to 0.5 nT. The pad 50 is fixed to the inner wall of the magnetic shielding cylinder 1, and the pad 50 is provided with a grooved pad 60. The probe 32 is placed in the groove of the pad 60, and the height of the probe 32 corresponds to that of the sample 7 being tested.

[0082] It should be noted that, in order to clearly illustrate the positional relationship between probe 32 and the sample 7 being tested, Figure 2 The pressure application component 2 is not shown. The test sample 7 is placed on the support position 21121 of the pressure application component 2, instead of on the pad 50.

[0083] The materials of both pad 50 and pad 60 are preferably lightweight plastics with a residual magnetism of less than or equal to 0.5 nT.

[0084] In some embodiments, the first clamping member 21 is not fixed to the reaction frame 4, the top side of the first clamping member 21 abuts against the reaction frame 4, and the bottom side of the second clamping member 22 abuts against the top side of the force sensor 6 or the top side of the actuator 51, thereby suspending the pressure application assembly 2.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A device for measuring changes in the magnetic properties of a material under pressure, characterized in that, include: Magnetic shielding tube (1); A pressure-applying component (2) is spaced apart from the magnetic shielding cylinder (1). The pressure-applying component (2) includes a first clamping member (21) and a second clamping member (22) that are hinged in an X-shape on a vertical plane. The portions of the pressure-applying component (2) located on both sides of the hinge point of the first clamping member (21) and the second clamping member (22) are respectively a clamping section (23) and a force-applying section (24). The clamping section (23) is at least partially located inside the magnetic shielding cylinder (1). The portion of the clamping section (23) located inside the magnetic shielding cylinder (1) is made of a material that meets the following conditions: when the residual magnetism measurement distance is 2cm, the residual magnetism of the material is less than or equal to 0.5nT. The clamping section (23) is provided with a support position (21121) for supporting the sample (7) to be tested. The force-applying section (24) is located outside the magnetic shielding cylinder (1). The magnetic index monitoring meter (3) includes a monitoring meter body (31) and a probe (32). The monitoring meter body (31) is located outside the magnetic shielding cylinder (1), and the probe (32) is located inside the magnetic shielding cylinder (1). The reaction frame (4) and the actuator (5) located on the reaction frame (4) are both located outside the magnetic shielding cylinder (1); the reaction frame (4) and the actuator (5) together constrain the force application section (24) of the pressure application component (2) so that the pressure application component (2) is suspended; the actuator (5) can make the first clamping member (21) and the second clamping member (22) close together to clamp the sample under test (7) on the support position (21121).

2. The device for measuring the change of magnetic properties of a material under pressure according to claim 1, characterized in that, The magnetic shielding cylinder (1) is provided with a clearance hole (111), the pressure application component (2) passes through the clearance hole (111), and the hinge point of the first clamping member (21) and the second clamping member (22) is located in the clearance hole (111).

3. The device for measuring the change of magnetic properties of a material under pressure according to claim 1, characterized in that, The portion of the clamping section (23) located on the first clamping member (21) is the first clamping part (211), and the portion of the clamping section (23) located on the second clamping member (22) is the second clamping part (221). The first clamping part (211) is located below the second clamping part (221). A support position (21121) is formed on the top side of the portion of the first clamping part (211) away from the force-applying section (24). The support position (21121) is located in the same horizontal plane. The first clamping member (21) is fixed to the reaction frame (4).

4. The device for measuring the change of magnetic properties of a material under pressure according to claim 3, characterized in that, The first clamping part (211) includes a first clamping rod part (2111) and a support plate (2112). The first clamping rod part (2111) is connected to the force-applying section (24). The support plate (2112) is located at one end of the first clamping rod part (2111) away from the force-applying section (24). The support position (21121) is formed on the top side of the support plate (2112). Along the axial direction of the first clamping member (21) relative to the rotation axis of the second clamping member (22), the size of the support position (21121) is larger than the size of the first clamping rod part (2111).

5. The device for measuring the change of magnetic properties of a material under pressure according to claim 4, characterized in that, The second clamping part (221) includes a second clamping rod part (2211), a first ball joint (2212) and a first loading plate (2213). The second clamping rod part (2211) is connected to the force application section (24). The first loading plate (2213) is connected to the second clamping rod part (2211) through the first ball joint (2212) and is located below the second clamping rod part (2211). The first loading plate (2213) is provided corresponding to the support position (21121), and the bottom side of the first loading plate (2213) is located in the same plane.

6. The device for measuring the change of magnetic properties of a material under pressure according to claim 1, characterized in that, The portion of the force-applying section (24) located on the first clamping member (21) is the first force-applying part (212), and the portion of the force-applying section (24) located on the second clamping member (22) is the second force-applying part (222). The first force-applying part (212) is located above the second force-applying part (222). The second force-applying part (222) includes a second force-applying rod (2221), a second ball joint (2222), and a second loading plate (2223). The second force-applying rod (2221) is connected to the clamping section (23). The second loading plate (2223) is connected to the second ball joint (2222) via the second ball joint (2222). 22) Connected to the second force-applying rod (2221) and located below the second force-applying rod (2221), the bottom side of the second loading plate (2223) is located in the same plane; the actuator (5) has a liftable actuator (51), the actuator (51) is provided corresponding to the second loading plate (2223) and located below the second loading plate (2223), the top side of the actuator (51) is located in the same horizontal plane; the actuator (51) is used to lift the second loading plate (2223) so that the first clamping member (21) and the second clamping member (22) close together.

7. The apparatus for measuring the change of magnetic properties of a material under pressure according to claim 6, characterized in that, The second ball joint (2222) is located near the end of the second force-applying rod (2221) away from the clamping section (23).

8. The apparatus for measuring the change of magnetic properties of a material under pressure according to claim 6, characterized in that, The device for measuring the change of magnetic properties of the material during compression also includes a force sensor (6), the top side and the bottom side of the force sensor (6) are parallel to each other, and the force sensor (6) is placed on the top side of the actuator (51).

9. The apparatus for measuring the change of magnetic properties of a material under pressure according to claim 7, characterized in that, The second force-applying rod (2221) includes a first rod segment (22211) and a second rod segment (22212). The first rod segment (22211) is relatively close to the clamping segment (23), and the second rod segment (22212) is relatively far away from the clamping segment (23). The second rod segment (22212) is detachably connected to the first rod segment (22211), and the second ball joint (2222) is provided on the second rod segment (22212).

10. The apparatus for measuring the change of magnetic properties of a material under pressure according to claim 1, characterized in that, The length of the force-applying section (24) is greater than the length of the clamping section (23), and the actuator (5) is positioned closer to the force-applying section (24) and further away from the clamping section (23).

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