Non-magnetic compression load loading device and method suitable for magnetic shielding cylinder

Abstract

The invention discloses a non-magnetic compression load loading device and a non-magnetic compression load loading method suitable for a magnetic shielding cylinder, and provides a completely non-magnetic compression loading device, which can reduce the interference of loading on a magnetic test, realize load control through a mechanical structure, prevent an external sensor from introducing magnetic pollution, and improve the reliability of the magnetic shielding cylinder. The loading device is miniaturized and non-magnetized, so that the defects of a conventional method can be effectively avoided, and the sealing property of the magnetic shielding cylinder can be maintained. According to the embodiment of the invention, the test sample is loaded by using the bolt according to the relation between the bolt torque and the axial force, so that the miniaturization of the loading device is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of material mechanical property testing equipment, in particular to a non-magnetic compression load loading device and method suitable for a magnetic shielding cylinder. Background Art

[0002] The properties of materials under the action of force, such as those related to elasticity and inelasticity, and those related to stress and strain, are all considered mechanical properties of the materials. In the process of researching and developing new materials, improving material quality, designing and using metal parts, etc., mechanical properties are the most important performance indicators and are indispensable test items in the performance inspection of plastic processing products of materials. Mechanical property tests generally include tensile tests, torsion tests, compression tests, impact tests, hardness tests, stress relaxation tests, fatigue tests, etc. Stress relaxation tests and fatigue tests are not conventional mechanical property tests of materials. Currently, mechanical testing machines are usually used to load magnetic material specimens, and a clamp made of non-magnetic material is used on the chuck to apply a compressive load to the material. The problems with this method are: 1. Magnetic interference problem: Traditional compression loading devices use steel components, and the residual magnetic field usually exceeds 100,000 nT, which seriously interferes with the test accuracy of precision instruments such as magnetometers and flux gates, resulting in distortion of magnetic test data; 2. Poor structural compatibility: The inner diameter of the magnetic shielding tube is usually less than 40 mm, and the external dimensions of the conventional loading device do not match the magnetic shielding tube, and mechanical loading in a closed magnetic environment cannot be achieved; 3. Poor magnetic environment sealing: The external loading mechanism needs to transfer the load through a long rod, resulting in large-area openings at both ends of the magnetic shielding tube, and due to the presence of steel loading components, the uniformity of the internal central magnetic field will also be destroyed; 4. Signal transmission obstacles: The existing device lacks a dedicated signal channel design, resulting in signal lines such as displacement sensors and pressure sensors destroying the integrity of the magnetic shielding environment. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems in the prior art, propose a non-magnetic compression load loading device and method suitable for a magnetic shielding tube, provide a completely non-magnetic compression loading device, reduce the interference of loading on magnetic testing, realize load control through mechanical structure, and avoid magnetic contamination introduced by external sensors.

[0004] The lock member is a pair of locks, and the lock member is a pair of locks, and the lock member is a pair of locks, and the two ends of the lock member are connected to the upper and lower ends of the lock member. The force measuring bolt and / or the upper clamping block and / or the lower clamping block are circumferentially provided with a plurality of strain gauges, and the axial force on the sample is calculated based on the strain gauge data.

[0005] Preferably, the strain gauge data are used to determine the stress conditions on each side of the force measuring bolt, and the corresponding peripheral loading bolts are adjusted according to the stress conditions on each side to ensure uniform loading of the central force measuring bolt.

[0006] Preferably, there are four strain gauges, which are mounted using a full-bridge mounting method.

[0007] Preferably, the non-magnetic material is composed of one or more combinations of titanium alloy, aluminum alloy, ceramic, and polymer materials.

[0008] Preferably, the force measuring bolt and the loading bolt are made of titanium alloy, the upper clamping plate and the lower clamping plate are made of alumina ceramics or FR4 epoxy resin, and the upper clamping block and the lower clamping block are made of aluminum alloy and FR4 epoxy resin.

[0009] Preferably, the upper clamping block and the lower clamping block are provided with boss positioning grooves for cooperating with the test piece.

[0010] Preferably, the compression loading device has a body height of ≤100 mm, an outer diameter of ≤25 mm, and an overall residual magnetism of <2 nT.

[0011] Preferably, the loading bolt includes a first screw and a second screw, and the end of the first screw is detachably connected to the end of the second screw by a quick connection mechanism. The quick connection structure includes at least two first connecting blocks arranged in a circular array at the end of the first screw and at least two second connecting blocks arranged in a circular array at the end of the second screw, a first hollow for inserting the second connecting block is provided between adjacent first connecting blocks, and a second hollow for inserting the first connecting block is provided between adjacent second connecting blocks, a side wall of one side of the first connecting block is provided with a first connecting groove and a first clamping block opened laterally, a side wall of one side of the second connecting block is provided with a second clamping block engaged with the first connecting groove and a second connecting groove engaged with the first clamping block, a baffle arranged along the axial direction of the screw and an elastic mechanism for driving the baffle to move away from the center of the screw is provided on the side opposite to the first connecting groove in the first hollow or on the side opposite to the second connecting groove in the second hollow.

[0012] Preferably, the elastic mechanism includes a sliding cavity provided on the lower side of the first hollow or the second hollow, and a slider that slides with the sliding cavity is provided at the bottom of the baffle. The slider can be slidably arranged in the sliding cavity, and an elastic member for driving the slider to rise is also provided in the sliding cavity.

[0013] Preferably, a pressing block is provided on the top of the baffle.

[0014] Another object of the present invention is to provide a loading method for a non-magnetic compression load loading device for a magnetic shielding cylinder as described above, comprising the following steps: First, place the specimen to be measured between the upper clamping block and the lower clamping block, then connect the force-measuring bolt and the loading bolt. Apply the load through the force-measuring bolt at the center of rotation. According to the strain gauge measurement results, adjust the torque of the corresponding loading bolts on the periphery according to the force conditions on each side, so that the deformation of each strain gauge is basically consistent, indicating that the bolt loads the specimen evenly. The load size is calculated based on the force-measuring bolt calibration results or strain gauge test results. Among them, the torque-axial force conversion formula is T=KdF, where T is the bolt tightening torque, unit is N•m; K is the torque coefficient, the commonly used coefficient is 0.15-0.2; F is the bolt axial force, unit is N; d is the bolt nominal diameter, unit is m; The relationship between the axial force and the stress on the specimen is expressed as σ=F / A, where σ is the mechanical stress on the specimen, in MPa; A is the contact area between the specimen and the clamping block, in .

[0015] Preferably, the axial force on the specimen is calculated by the strain gauge result according to the formula F=EAε, wherein E is the elastic modulus of the titanium alloy bolt, in MPa; ε is the strain of the titanium alloy bolt, measured by the strain gauge.

[0016] The beneficial effects of the non-magnetic compression load loading device and method suitable for magnetic shielding cylinders of the present invention are as follows: the present invention has high magnetic compatibility, the residual magnetic field of the device is in the nT range, which is more than 5 orders of magnitude lower than the residual magnetic field of the steel component loading method, and is more suitable for high-precision measurement; the spatial adaptability is strong, the device volume is reduced, and it is suitable for most magnetic shielding cylinder sizes; the loading performance is strong, and the center loading bolt is changed according to needs, and the maximum load can exceed 30kN, meeting most test requirements; the operation is convenient: no external loading mechanism is required, and a fully enclosed test in a magnetic shielding environment is achieved; the mechanical conversion mechanism realizes precise loading through the nonlinear conversion relationship between bolt torque and axial force.

[0017] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of a non-magnetic compression load loading device suitable for a magnetic shielding cylinder of the present invention.

[0019] Figure 2 The diagram is a top view of the structure of a non-magnetic compression load loading device suitable for a magnetic shielding cylinder according to the present invention.

[0020] Figure 3 The present invention is a schematic diagram of a main cross-sectional structure of a non-magnetic compression load loading device suitable for a magnetic shielding cylinder.

[0021] Figure 4 This is a schematic diagram of a force-measuring bolt equipped with a strain gauge.

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the loading bolt in the second embodiment.

[0023] Figure 6 This is a schematic diagram of the top view of the first screw rod of the loading bolt in Example 2.

[0024] Figure 7 This is a schematic diagram of the bottom view of the first screw rod of the loading bolt in Example 2.

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure after the first screw rod and the second screw rod of the loading bolt in Example 2 are connected.

[0026] Figure 9 It is a schematic diagram of the cross-sectional structure of the first screw rod of the loading bolt in the second embodiment.

[0027] Figure 10 is the strain-axial force calibration curve.

[0028] In the figure: 1-upper clamping plate, 2-lower clamping plate, 3-force measuring bolt, 4-loading bolt, 5-upper clamping block, 6-lower clamping block, 7-strain gauge, 41-first screw, 42-second screw, 43-first connecting block, 44-second connecting block, 45-blocking plate, 46-elastic member, 101-boss positioning groove, 401-sliding cavity, 431-first connecting groove, 432-first clamping block, 441-second connecting groove, 442-second clamping block, 451-slider, 452-pressing block. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. However, it should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the present invention.

[0030] In the description of the present invention, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0031] In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0032] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. Example 1

[0033] See Figure 1 、 Figure 2 、 Figure 3 The present invention provides a non-magnetic compression load loading device suitable for a magnetic shielding tube, including a bolt loading system. The bolt loading system consists of 6 M6×40mm titanium alloy TC4 bolts and 1 M12×40mm titanium alloy TC4 bolt, which are symmetrically distributed in a hexagon: 6 M6×40mm titanium alloy TC4 bolts on the periphery serve as loading bolts, and 1 M12×40mm titanium alloy TC4 in the center serves as a force measuring bolt. The force measuring bolts need to be calibrated, and the bolt pre-tightening torque range is: 0.5-25N•m.

[0034] The clamping module includes an upper clamping plate 1 and a lower clamping plate 2 arranged opposite to each other, made of non-magnetic materials such as alumina ceramics and FR4 epoxy resin, with an outer diameter of 25mm and a thickness of 8mm, and a compressive material strength greater than 2000MPa.

[0035] The upper clamping plate 1 and the lower clamping plate 2 are respectively provided with an upper clamping block 5 and a lower clamping block 6 which are arranged opposite to each other and are made of non-magnetic materials such as aluminum alloy, FR4 epoxy resin, etc., and have a boss positioning groove thereon for fixing the material specimen to be tested, and a clamping space for clamping the specimen is provided between the upper clamping block 5 and the lower clamping block 6.

[0036] Bench: Used to hold fixtures and facilitate applying torque to bolts.

[0037] The upper clamping block 5 and the lower clamping block 6 are both cylindrical, and the force measuring bolt 3 is arranged in the upper clamping block 5 and the lower clamping block 6. The force measuring bolt 3 is circumferentially attached with four strain gauges 7, and adopts the full-bridge attachment method. It mainly plays two roles. One is to calculate the axial force on the sample through the strain gauge data, and the other role is to adjust the six outer bolts by observing the four strain gauge data so that the central force measuring bolt is evenly loaded without eccentric loading. Due to the size limitation of the inner diameter of the conventional magnetic shielding tube and the common loading methods such as mechanical testing machines, hydraulic loading and piezoelectric ceramic drive, which will destroy the uniformity of the magnetic field in the magnetic shielding barrel, miniaturizing the loading device and de-magnetizing it can effectively circumvent the defects of the conventional method and maintain the sealing of the magnetic shielding tube. The embodiment utilizes the relationship between the bolt torque and the axial force, and uses bolts to load the sample to achieve the miniaturization of the loading device.

[0038] First, the six peripheral loading bolts 4 are used to fix the clamping block and the specimen, and the load is applied through the force-measuring bolt 3 at the rotating center. According to the measurement results of the strain gauge 7, the torque of the peripheral bolts is fine-tuned to make the deformation of the four strain gauges 7 of the central bolt basically consistent, indicating that the bolts load the specimen evenly. The load size is calculated based on the force-measuring bolt calibration results or the strain gauge test results.

[0039] In order to facilitate the positioning of the test piece, the upper clamping block 5 and the lower clamping block 6 are provided with boss positioning grooves 101 for cooperating with the test piece. Example 2

[0040] See Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9On the basis of the first embodiment, in order to facilitate the rapid configuration of the loading bolt 4, the loading bolt 4 includes a first screw rod 41 and a second screw rod 42, wherein the first screw rod 41 and the second screw rod 42 are respectively provided with a screw head and a nut, and the end of the first screw rod 41 is detachably connected to the end of the second screw rod 42 by a quick connection mechanism, and the quick connection structure includes two first connecting blocks 43 arranged in an annular array at the end of the first screw rod 41 and two second connecting blocks 44 arranged in an annular array at the end of the second screw rod 42, and a space for inserting the second connecting blocks 44 is provided between adjacent first connecting blocks 43. A first hollow is provided, and a second hollow is provided between adjacent second connecting blocks 44 for inserting the first connecting block 43. A first connecting groove 431 and a first clamping block 432 are provided on one side wall of the first connecting block 43. A second clamping block 442 engaged with the first connecting groove 431 and a second connecting groove 441 engaged with the first clamping block 432 are provided on one side wall of the second connecting block 44. A baffle 45 arranged along the axial direction of the screw and an elastic mechanism for driving the baffle 45 to move away from the center of the screw are provided on the side opposite to the first connecting groove 431 in the first hollow. In this embodiment, the loading bolt 4 is configured as a split structure consisting of a first screw rod 41 and a second screw rod 42, and a quick connection mechanism is provided between the two to realize quick connection and quick separation between the screw rods, so as to facilitate quick opening of the compression loading device body and quick assembly of the compression loading device body. The loading bolt 4 can be disassembled without unscrewing the nuts on the loading bolt 4 one by one, thereby improving efficiency and reducing labor intensity. During use, when the first screw rod 41 and the second screw rod 42 need to be connected, the first connecting block 43 is inserted into the second hollow and the second connecting block 44 is correspondingly inserted into the first hollow. During the insertion process, the end of the second connecting block 44 contacts the baffle 45, thereby pressing the baffle 45 and moving the baffle 45 downward until the second connecting block 44 moves to the limit position in the first hollow, and then the first screw rod 41 and the second screw rod 42 are rotated relative to each other to make the first connecting groove 431 and the second clamping block 44 2 meshes, the first clamping block 432 meshes with the second connecting groove 441. During the rotation process, the end of the second connecting block 44 separates from the end of the blocking piece 45, so that the upper end of the blocking piece 45 loses the pressure, and the blocking piece 45 automatically returns to its original position and bounces up in the elastic mechanism, and contacts and cooperates with the side of the second connecting block 44, so that the second connecting block 44 cannot rotate, and the first connecting groove 431 and the second clamping block 442, and the first clamping block 432 and the second connecting groove 441 cannot be separated, thereby locking the first screw rod 41 and the second screw rod 42 together; when it is necessary to separate the first screw rod 41 and the second screw rod 42, the blocking piece 45 is pressed down, and the second clamping block 442 loses the limit of the blocking piece 45, so that the second clamping block 442 can be reversed, and the first connecting groove 431 and the second clamping block 442, and the first clamping block 432 and the second connecting groove 441 can be separated, and then the first screw rod 41 and the second screw rod 42 can be pulled out.Easy to use, no need to repeatedly screw the nut on and off each time you connect, which improves efficiency.

[0041] For details, see Figure 9 The elastic mechanism includes a sliding cavity 401 provided on the lower side of the first hollow, and a slider 451 is provided at the bottom of the baffle 45, which slides with the sliding cavity 401. The slider 451 can be slidably arranged in the sliding cavity 401, and an elastic member 46 is also provided in the sliding cavity 401 for driving the slider 451 to rise.

[0042] See Figure 9 A pressing block 452 is provided on the top of the baffle 45. The pressing block 452 can be pressed by fingers or nails or with the help of a tool to control the baffle 45. Example 3

[0043] See Figure 1 、 Figure 3 、 Figure 4 、 Figure 10 Based on the first embodiment, this embodiment proposes a method for loading a non-magnetic compressive load on a magnetic shielding cylinder, comprising the following steps: first, placing a test piece to be measured between the upper clamping block 5 and the lower clamping block 6, then connecting the force measuring bolt 3 and the loading bolt 4, applying a load through the force measuring bolt 3 at the center of rotation, and adjusting the torque of the corresponding loading bolts 4 on the periphery according to the force conditions on each side based on the measurement results of the strain gauge 7, so that the deformation of each strain gauge is basically consistent, indicating that the bolts load the sample evenly, and the load size is calculated based on the calibration results of the force measuring bolt 3 or the test results of the strain gauge 7; Among them, the torque-axial force conversion formula is T=KdF, where T is the bolt tightening torque, unit is N•m; K is the torque coefficient, the commonly used coefficient is 0.15-0.2; F is the bolt axial force, unit is N; d is the nominal diameter of the bolt, unit is m.

[0044] The relationship between the axial force and the stress on the specimen is expressed as σ=F / A, where σ is the mechanical stress on the specimen, in MPa; A is the contact area between the specimen and the clamping block, in .

[0045] The axial force on the specimen can also be calculated by the strain gauge results according to the formula F=EAε, where E is the elastic modulus of the titanium alloy bolt, in MPa; ε is the strain of the titanium alloy bolt, measured by the strain gauge. The standard parts used in this application document can all be purchased from the market, and the specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The electric slide rail slide, cylinder, welding machine, electric telescopic rod and internal components of the controller all adopt conventional models in the existing technology, and their internal structure belongs to the existing technology structure. Workers can complete normal operation of them according to the existing technical manual. In addition, the circuit connection adopts the conventional connection method in the existing technology, and no detailed description is given here.

[0046] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present invention. Therefore, based on the innovative concept of the present invention, changes and modifications to the embodiments described herein, or equivalent structural or equivalent process transformations made using the contents of the present invention's description and drawings, and direct or indirect application of the above technical solutions to other related technical fields, are all included in the scope of protection of the present invention's patent.

Claims

1. A non-magnetic compressive load loading device suitable for a magnetic shielding cylinder, comprising a compression loading device body, characterized in that: The compression loading device body comprises an upper clamping plate (1) and a lower clamping plate (2) arranged opposite to each other. A vertically arranged force measuring bolt (3) is provided at the center of the upper clamping plate (1) and the lower clamping plate (2). At least three vertically arranged loading bolts (4) are provided around the force measuring bolt (3). The upper and lower ends of the loading bolt (4) are respectively connected to the upper clamping plate (1) and the lower clamping plate (2). The upper clamping block (5) is respectively provided on the upper clamping plate (1) and the lower clamping plate (2). , a lower clamping block (6), a clamping space for clamping a test piece is provided between the upper clamping block (5) and the lower clamping block (6), the upper clamping block (5) and the lower clamping block (6) are both cylindrical, the force measuring bolt (3) is provided in the upper clamping block (5) and the lower clamping block (6), the upper clamping plate (1), the lower clamping plate (2), the force measuring bolt (3), the loading bolt (4), the upper clamping block (5), and the lower clamping block (6) are all made of non-magnetic material; The force measuring bolt (3) and / or the upper clamping block (5) and / or the lower clamping block (6) are circumferentially provided with a plurality of strain gauges (7), and the axial force applied to the specimen is calculated using data from the strain gauges (7).

2. A non-magnetic compressive load applying device for a magnetic shielding cylinder according to claim 1, characterized in that: The stress conditions on each side of the force measuring bolt (3) are determined by using the data from each strain gauge (7), and the corresponding loading bolts (4) on the periphery are adjusted according to the stress conditions on each side, so that the central force measuring bolt (3) is evenly loaded.

3. A non-magnetic compressive load applying device for a magnetic shielding cylinder according to claim 1, characterized in that: The strain gauges (7) have four pieces and adopt a full-bridge mounting method.

4. A non-magnetic compressive load applying device for a magnetic shielding cylinder according to claim 1, characterized in that: The non-magnetic material is composed of one or more combinations of titanium alloy, aluminum alloy, ceramic, and polymer materials.

5. A non-magnetic compressive load applying device for a magnetic shielding cylinder as claimed in claim 3, characterized in that: The force measuring bolt (3) and the loading bolt (4) are made of titanium alloy, the upper clamping plate (1) and the lower clamping plate (2) are made of alumina ceramics or FR4 epoxy resin, and the upper clamping block (5) and the lower clamping block (6) are made of aluminum alloy and FR4 epoxy resin.

6. A non-magnetic compressive load applying device for a magnetic shielding cylinder as claimed in claim 1, characterized in that: The upper clamping block (5) and the lower clamping block (6) are provided with boss positioning grooves (101) for cooperating with the test piece.

7. A non-magnetic compressive load applying device for a magnetic shielding cylinder as claimed in claim 1, characterized in that: The loading bolt (4) includes a first screw rod (41) and a second screw rod (42). The end of the first screw rod (41) is detachably connected to the end of the second screw rod (42) through a quick connection mechanism. The quick connection structure includes at least two first connecting blocks (43) arranged in an annular array at the end of the first screw rod (41) and at least two second connecting blocks (44) arranged in an annular array at the end of the second screw rod (42). A first hollow (47) for inserting the second connecting block (44) is provided between adjacent first connecting blocks (43), and a second hollow (48) for inserting the first connecting block (43) is provided between adjacent second connecting blocks (44). A hollow (48) is provided, a side wall of one side of the first connecting block (43) is provided with a first connecting groove (431) and a first clamping block (432) which are opened transversely, a side wall of one side of the second connecting block (44) is provided with a second clamping block (442) which engages with the first connecting groove (431) and a second connecting groove (441) which engages with the first clamping block (432), a baffle (45) which is arranged along the axial direction of the screw and an elastic mechanism for driving the baffle (45) to move away from the center of the screw are provided on the side of the first hollow (47) opposite to the first connecting groove (431) or on the side of the second hollow (48) opposite to the second connecting groove (441).

8. A non-magnetic compressive load applying device for a magnetic shielding cylinder as claimed in claim 7, characterized in that: The elastic mechanism includes a sliding cavity (401) provided at the lower side of the first hollow (47) or the second hollow (48), a slider (451) slidably engaged with the sliding cavity (401) is provided at the bottom of the blocking piece (45), the slider (451) is slidably provided in the sliding cavity (401), and an elastic member (46) for driving the slider (451) to rise is also provided in the sliding cavity (401).

9. A non-magnetic compressive load applying device for a magnetic shielding cylinder as claimed in claim 8, characterized in that: A pressing block (452) is provided on the top of the blocking piece (45).

10. A loading method for the non-magnetic compression load loading device for a magnetic shielding cylinder according to any one of claims 1 to 9, characterized in that: The following steps are involved: First, place the test piece to be measured between the upper clamping block (5) and the lower clamping block (6), then connect the force measuring bolt (3) and the loading bolt (4), apply the load through the force measuring bolt (3) at the center of rotation, and adjust the torque of the corresponding loading bolt (4) on the periphery according to the force conditions on each side based on the measurement results of the strain gauge (7) so that the deformation of each strain gauge is basically the same, indicating that the bolt loads the sample evenly. The load size is calculated based on the calibration results of the force measuring bolt (3) or the test results of the strain gauge (7); Among them, the torque-axial force conversion formula is T=KdF, where T is the bolt tightening torque, unit is N•m; K is the torque coefficient, the commonly used coefficient is 0.15-0.2; F is the bolt axial force, unit is N; d is the bolt nominal diameter, unit is m; The relationship between the axial force and the stress on the specimen is expressed as σ=F / A, where σ is the mechanical stress on the specimen, in MPa; A is the contact area between the specimen and the clamping block, in ; When the axial force on the specimen is calculated through the strain gauge results, it is calculated according to the formula F=EAε, where E is the elastic modulus of the titanium alloy bolt, in MPa; ε is the strain of the titanium alloy bolt, measured by the strain gauge.

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