A NdFeB magnetic material detection device and detection method

Abstract

The present invention relates to the technical field of material detection, and specifically to a neodymium iron boron magnetic material detection device and detection method, comprising a measuring device and a detection block, a lower bracket assembly is installed on the surface of the measuring device, the top of the lower bracket assembly is movably connected to an upper bracket assembly that can move up and down, a second positioning block is installed in the middle position of the lower bracket assembly, and a first positioning block is installed in the middle position of the upper bracket assembly, and the first positioning block and the second positioning block are arranged in a mirror image; and also includes a support ring, the surface of the support ring is provided with an inlay groove for inlaying and installing the detection block, the first positioning block and the second positioning block are used to fix the support ring at the center position of the detection area of ​​the measuring device, and the purpose of the present invention is to solve the problem of inconvenience in operation when manually placing a magnet in a detection coil for magnetic measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of material detection, and in particular to a NdFeB magnetic material detection device and a detection method. Background Art

[0002] NdFeB is a high-performance magnetic material widely used in household appliances, transportation, medical health, aerospace and other fields. In order to meet the use requirements of NdFeB magnets in different fields and objectively evaluate the applicability and quality of magnets, it is usually necessary to conduct various index tests on NdFeB magnets. These tests are divided into three aspects: product appearance size and physical properties, product magnetic properties, and product performance auxiliary detection items. In terms of magnetic properties, it is usually necessary to use a fluxmeter to measure the magnetic flux of the magnet.

[0003] When using a fluxmeter to detect the magnetic flux of NdFeB, the NdFeB needs to be placed in a measuring coil. Usually, the magnet is placed manually. When the magnet is placed manually in the detection coil for magnetic measurement, precise alignment and positioning are required, which can easily take a long time and easily cause operator fatigue after long-term repeated operations, thereby affecting the accuracy of the operation and making the operation inconvenient. Summary of the invention

[0004] The purpose of the present invention is to provide a NdFeB magnetic material detection device and detection method to solve the problem of inconvenience in operation when manually placing a magnet in a detection coil for magnetic measurement.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A NdFeB magnetic material detection device comprises a measuring device and a detection block, wherein a lower bracket assembly is mounted on the surface of the measuring device, an upper bracket assembly movable up and down is movably connected to the top of the lower bracket assembly, a second positioning block is mounted in the middle of the lower bracket assembly, a first positioning block is mounted in the middle of the upper bracket assembly, and the first positioning block and the second positioning block are arranged in a mirror image;

[0007] It also includes a support ring, the surface of which is provided with an inlay groove for inlaying and installing the detection block, and the first positioning block and the second positioning block are used to fix the support ring at the center of the detection area of ​​the measuring device;

[0008] The invention also comprises a traction rod, which is used to move the support ring to the center position of the detection area of ​​the measuring device.

[0009] Preferably, the lower bracket assembly includes a supporting chassis, a first support rod and a second U-shaped rod, the supporting chassis is fixedly connected to the surface of the measuring instrument, the first support rod is vertically fixedly connected to the top of the supporting chassis, the second U-shaped rod is fixedly connected to the middle position of the supporting chassis, and the second positioning block is vertically fixedly connected to the middle position of the second U-shaped rod.

[0010] Preferably, the upper bracket assembly includes a second support rod, a first U-shaped rod and a connecting rod, the first U-shaped rod is fixedly connected to the middle position of the connecting rod, the first positioning block is vertically fixedly connected to the middle position of the first U-shaped rod, the second support rod is vertically fixedly connected to the bottom end of the connecting rod, and the second support rod and the first support rod are movably connected.

[0011] Preferably, a T-shaped rod is fixedly connected to the top end of the first support rod, and a T-shaped slot for the T-shaped rod to move up and down is formed at the bottom end of the second support rod.

[0012] Preferably, the top end of the support ring is fixedly connected with a first embedment block, the bottom end of the first positioning block is cooperated with to form a first positioning groove for the first embedment block to be embedded, the bottom end of the support ring is fixedly connected with a second embedment block, and the top end of the second positioning block is cooperated with to form a second positioning groove for the second embedment block to be embedded.

[0013] Preferably, the right end of the support ring is fixedly connected to a docking block, and the right end of the docking block is fixedly connected to a hook plate of the same height. The left end of the traction rod is provided with a docking groove for the docking block and the hook plate to be embedded in, and the wall surface of the docking groove is rotatably connected to a baffle through a torsion spring, and the distance between the top of the baffle and the top of the docking groove wall is greater than the height of the docking block.

[0014] Preferably, the upper and lower end surfaces of the traction rod are provided with limiting grooves, the limiting groove at the upper end of the traction rod is used for limiting sliding of the first positioning block, the limiting groove at the lower end of the traction rod is used for limiting sliding of the second positioning block, and the upper end of the traction rod is provided with a guide slope at the left end of the limiting groove, and the guide slope is used to guide the first positioning block to move upward.

[0015] Preferably, the right end of the second U-shaped rod is movably connected to a lifting rod, the surface of the second U-shaped rod is provided with a sliding groove for the lifting rod to move up and down, one end of the lifting rod is fixedly connected to a vertically arranged top rod, and the bottom wall of the second positioning groove has a through hole for the top rod to extend out.

[0016] A method for detecting NdFeB magnetic materials is carried out using the NdFeB magnetic material detection device, and the specific steps are as follows:

[0017] A. First, connect the measuring device to the instrument with wires, and then calibrate the data. Then, move the traction rod from the right side to the left side of the device, and move the second positioning block along the limit groove track at the bottom of the traction rod. When the traction rod contacts the first positioning block, it continues to move to the left, which will cause the first positioning block to rise along the surface of the guide slope, driving the first U-shaped rod and the second support rod to move upward, so that the T-shaped rod moves along the track of the T-shaped groove until the first positioning block moves into the limit groove track at the top of the traction rod. When the traction rod moves to the left to the left side of the extension device, stop the movement of the traction rod;

[0018] B. Then, the detection block is embedded into the inlay groove, and then the docking block and the hook plate are embedded into the docking groove, and the right side of the hook plate is in contact with the right wall of the docking groove. Then, the support ring is moved downward to drive the docking block and the hook plate to move downward along the track of the docking groove. At this time, the hook plate is located between the baffle plate and the right side wall of the docking groove;

[0019] C. Then move the traction rod to the right again, which will drive the support ring to move together. When the traction rod drives the support ring to move to the bottom of the first positioning block, the first positioning block will automatically drop without the support of the traction rod, so that the first positioning groove covers the first embedded block. At this time, continue to move the traction rod to the right, and the support ring is covered by the first positioning block and no longer moves, so that the hook plate and the baffle plate resist each other, forcing the baffle plate to rotate, so that the docking block and the hook plate are moved out of the docking groove. At this time, the support ring stays in the center of the measuring device, and under the action of gravity, the support ring, the first positioning block, the first U-shaped rod, and the second support rod all drop, so that the second embedded block is stuck in the second positioning groove to fix the support ring;

[0020] D. Finally, take out the traction rod from the right side of the measuring instrument, start the instrument to observe the data, and measure the magnetic properties of the detection block.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By setting the support ring, the first positioning block and the second positioning block, the first positioning block and the second positioning block can fix the support ring at the center of the measuring device detection area, so that the detection block for each detection can be located at the center of the measuring device detection area, which is conducive to avoiding the measurement error caused by vibration movement;

[0023] 2. By setting the traction rod, it is convenient to move the detection block to the center of the detection area of ​​the measuring device, or move it out of the center of the detection area of ​​the measuring device, which is helpful to prevent the problem of manual placement of the detection block, which makes it difficult to go deep into the center of the detection area of ​​the measuring device, resulting in a cumbersome process of placing the detection block;

[0024] 3. Through the linkage effect of the set traction rod, support ring, first positioning block and second positioning block, the detection block can be supported to be located at the center of the detection area of ​​the measuring device. Compared with the traditional clamp that clamps the detection block and places it at the center of the detection area of ​​the measuring device, it is automatically aligned with the center of the detection area of ​​the measuring device for fixation, without observation and calibration, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a structural schematic diagram of part of the present invention;

[0027] Figure 3 It is a schematic structural diagram of a cutaway section of a first U-shaped rod of the present invention;

[0028] Figure 4 It is a schematic structural diagram of a cutaway section of a second support rod of the present invention;

[0029] Figure 5 It is a schematic structural diagram of a cutaway section of a second U-shaped rod of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the traction rod of the present invention;

[0031] Figure 7 It is a schematic structural diagram of the support ring of the present invention.

[0032] In the figure: 1, measuring device; 2, supporting chassis; 3, first support rod; 4, T-shaped rod; 5, T-shaped slot; 6, second support rod; 7, first U-shaped rod; 8, first positioning block; 9, first positioning slot; 10, second positioning slot; 11, second positioning block; 12, second U-shaped rod; 13, lifting rod; 14, sliding slot; 15, push rod; 16, pull ring; 17, traction rod; 18, limiting slot; 19, guiding inclined surface; 20, docking slot; 21, baffle; 22, supporting ring; 23, inlay slot; 24, docking block; 25, hook plate; 26, first embedded block; 27, second embedded block; 28, detection block; 29, connecting rod. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 7 , the present invention provides a technical solution:

[0035] A NdFeB magnetic material detection device comprises a measuring device 1 and a detection block 28, a lower bracket assembly is mounted on the surface of the measuring device 1, an upper bracket assembly that can move up and down is movably connected to the top of the lower bracket assembly, a second positioning block 11 is mounted in the middle of the lower bracket assembly, a first positioning block 8 is mounted in the middle of the upper bracket assembly, and the first positioning block 8 and the second positioning block 11 are arranged in a mirror image;

[0036] It also includes a support ring 22, the surface of the support ring 22 is provided with an inlay groove 23 for the detection block 28 to be inlaid and installed, and the first positioning block 8 and the second positioning block 11 are used to fix the support ring 22 at the center of the detection area of ​​the measuring device 1. By setting the support ring 22, the first positioning block 8 and the second positioning block 11, the first positioning block 8 and the second positioning block 11 can fix the support ring 22 at the center of the detection area of ​​the measuring device 1, so that the detection block 28 can be located at the center of the detection area of ​​the measuring device 1 each time it is detected, which is conducive to avoiding the measurement error caused by vibration movement;

[0037] It also includes a traction rod 17, which is used to move the support ring 22 to the center of the detection area of ​​the measuring device 1. By setting the traction rod 17, it is convenient to move the detection block 28 to the center of the detection area of ​​the measuring device 1, or move it out from the center of the detection area of ​​the measuring device 1, which helps to prevent the detection block 28 from being placed manually and cannot be conveniently placed in the center of the detection area of ​​the measuring device 1, resulting in a cumbersome process of placing the detection block 28.

[0038] Furthermore, the lower bracket assembly includes a supporting chassis 2, a first support rod 3 and a second U-shaped rod 12. The supporting chassis 2 is fixedly connected to the surface of the measuring device 1, the first support rod 3 is vertically fixedly connected to the top of the supporting chassis 2, the second U-shaped rod 12 is fixedly connected to the middle position of the supporting chassis 2, and the second positioning block 11 is vertically fixedly connected to the middle position of the second U-shaped rod 12. By setting the lower bracket assembly to support the second positioning block 11, the second positioning block 11 can be located within the detection area of ​​the measuring device 1.

[0039] Furthermore, the upper bracket assembly includes a second support rod 6, a first U-shaped rod 7 and a connecting rod 29. The first U-shaped rod 7 is fixedly connected to the middle position of the connecting rod 29. The first positioning block 8 is vertically fixedly connected to the middle position of the first U-shaped rod 7. By setting the upper bracket assembly, the first positioning block 8 is suspended so that the first positioning block 8 can be located within the detection area of ​​the measuring device 1. The second support rod 6 is vertically fixedly connected to the bottom end of the connecting rod 29. The second support rod 6 and the first support rod 3 are movably connected. The second support rod 6 is supported by the first support rod 3 so that the upper bracket assembly is supported. The positions of the first support rod 3 and the second support rod 6 avoid the detection area of ​​the measuring device 1, which is beneficial to prevent the traction rod 17 and the support ring 22 from being interfered with entering and exiting the detection area of ​​the measuring device 1.

[0040] Furthermore, the top end of the first support rod 3 is fixedly connected to a T-shaped rod 4, and the bottom end of the second support rod 6 is provided with a T-shaped slot 5 for the T-shaped rod 4 to move up and down, so that the upper bracket assembly can move up and down, which is conducive to adjusting the distance between the first positioning block 8 and the second positioning block 11, and facilitating the support ring 22 to be fixed between the first positioning block 8 and the second positioning block 11.

[0041] Furthermore, the top end of the support ring 22 is fixedly connected with a first embedment block 26, the bottom end of the first positioning block 8 is cooperated with to open a first positioning groove 9 for the first embedment block 26 to be embedded in, the bottom end of the support ring 22 is fixedly connected with a second embedment block 27, the top end of the second positioning block 11 is cooperated with to open a second positioning groove 10 for the second embedment block 27 to be embedded in, and the first embedment block 26 is embedded in the first positioning groove 9 and the second embedment block 27 is embedded in the second positioning groove 10, so that the first positioning block 8 and the second positioning block 11 fix the position of the support ring 22.

[0042] Furthermore, the right end of the support ring 22 is fixedly connected to a docking block 24, and the right end of the docking block 24 is fixedly connected to a hook plate 25 of the same height. The left end of the traction rod 17 is provided with a docking groove 20 for the docking block 24 and the hook plate 25 to be embedded. The wall of the docking groove 20 is rotatably connected to a baffle 21 through a torsion spring. The distance between the top of the baffle 21 and the top of the wall of the docking groove 20 is greater than the height of the docking block 24, ensuring that the docking block 24 and the hook plate 25 can be embedded into the docking groove 20 from above the baffle 21, and can be moved downward so that the hook plate 25 is located between the baffle 21 and the right wall of the docking groove 20, so that the support ring 22 can be moved by the traction rod 17, and the torsion spring connected to the baffle 21 can withstand the resistance of the hook plate 25 to the baffle 21 when the traction rod 17 pulls the support ring 22.

[0043] Furthermore, the upper and lower end surfaces of the traction rod 17 are provided with limit grooves 18. The limit groove 18 at the upper end of the traction rod 17 is used for the limited sliding of the first positioning block 8, and the limit groove 18 at the lower end of the traction rod 17 is used for the limited sliding of the second positioning block 11. By setting the first positioning block 8 and the second positioning block 11 to limit sliding in the limit grooves 18, it is helpful to prevent the traction rod 17 from deviating from the moving path when the traction support ring 22 is pulled. The upper end of the traction rod 17 is located at the left end of the limit groove 18. The guide slope 19 is used to guide the first positioning block 8 to move upward. By setting the guide slope 19, when the traction rod 17 moves to the left and contacts the first positioning block 8, the first positioning block 8 automatically moves to increase the distance between it and the second positioning block 11, which is convenient for operation.

[0044] Furthermore, the right end of the second U-shaped rod 12 is movably connected with a lifting rod 13, and the surface of the second U-shaped rod 12 is provided with a sliding groove 14 for the lifting rod 13 to move up and down. One end of the lifting rod 13 is fixedly connected with a vertically arranged push rod 15, and the bottom wall of the second positioning groove 10 has a through hole for the push rod 15 to extend out. By moving the lifting rod 13 upward along the track of the sliding groove 14, the push rod 15 is driven to extend out of the bottom wall of the second positioning groove 10, thereby the second embedded block 27 in the second positioning groove 10 can be ejected, which is conducive to conveniently releasing the fixation of the support ring 22.

[0045] Furthermore, a pull ring 16 is fixedly connected to the right end surface of the traction rod 17 , and the pull ring 16 is conducive to pulling and pushing the traction rod 17 .

[0046] The specific scheme is as follows: first connect the measuring device 1 to the instrument with wires, and then calibrate the data. When detecting the magnetism of NdFeB, it is necessary to place it in the center of the measuring device 1, detect its magnetic flux, and judge its magnetic properties. The specific method is to first move the traction rod 17 from the right side of the device to the left side, and move the second positioning block 11 along the track of the limit groove 18 at the bottom of the traction rod 17. When the traction rod 17 contacts the first positioning block 8 and continues to move to the left, the first positioning block 8 will rise along the surface of the guide slope 19, driving the first U-shaped rod 7 and the second support rod 6 to move upward, so that the T-shaped rod 4 moves along the track of the T-shaped groove 5 until the first The positioning block 8 moves to the track of the limit groove 18 at the top of the traction rod 17. When the traction rod 17 moves to the left to the left side of the extending device, the movement of the traction rod 17 is stopped, and then the detection block 28 is embedded in the inlay groove 23, and then the docking block 24 and the hook plate 25 are embedded in the docking groove 20, and the right side surface of the hook plate 25 is in contact with the right wall surface of the docking groove 20, and then the support ring 22 is moved downward, driving the docking block 24 and the hook plate 25 to move downward along the track of the docking groove 20. At this time, the hook plate 25 is located between the baffle 21 and the right side wall of the docking groove 20. At this time, moving the traction rod 17 to the right will drive the support ring 22 to move together. When the traction rod 17 drives the support ring 22 to move to the bottom of the first positioning block 8, the first positioning block 8 will automatically drop without the support of the traction rod 17, so that the first positioning groove 9 covers the first embedded block 26. At this time, the traction rod 17 continues to be moved to the right, and the support ring 22 is covered by the first positioning block 8 and no longer moves, so that the hook plate 25 resists the baffle plate 21, forcing the baffle plate 21 to rotate, so that the docking block 24 and the hook plate 25 are moved out of the docking groove 20. At this time, the support ring 22 stays in the center of the measuring device 1, and under the action of gravity, the support ring 22, the first positioning block 8, the first U-shaped rod 7, and the second support rod 6 all drop, so that the second embedded block 26 is locked. The block 27 is inserted into the second positioning groove 10 to fix the support ring 22. The instrument is started to observe the data and the magnetic properties of the detection block 28 are measured. It is easy to use. When the support ring 22 needs to be taken out from the measuring device 1, the traction rod 17 is first moved to the left so that the docking block 24 and the hook plate 25 are embedded in the docking groove 20. At this time, the first positioning block 8 has been moved away from the surface of the first embedded block 26 under the action of the guide slope 19. Then, by moving the lifting rod 13 upward, the push rod 15 is driven to move upward to push the second embedded block 27 out of the second positioning groove 10. At this time, the traction rod 17 can be pushed to the left to bring the support ring 22 out from the left side of the measuring device 1.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A NdFeB magnetic material detection device, comprising a measuring device (1) and a detection block (28), characterized in that: A lower bracket assembly is mounted on the surface of the measuring device (1); the top of the lower bracket assembly is movably connected to an upper bracket assembly that can move up and down; a second positioning block (11) is mounted in the middle of the lower bracket assembly; a first positioning block (8) is mounted in the middle of the upper bracket assembly; the first positioning block (8) and the second positioning block (11) are arranged in a mirror image; It also comprises a support ring (22), the surface of the support ring (22) being provided with an inlay groove (23) for inlaying and installing the detection block (28), and the first positioning block (8) and the second positioning block (11) being used to fix the support ring (22) at the center position of the detection area of ​​the measuring device (1); It also includes a traction rod (17), wherein the traction rod (17) is used to move the support ring (22) to the center position of the detection area of ​​the measuring device (1); The top end of the support ring (22) is fixedly connected to a first insert (26); the bottom end of the first positioning block (8) is provided with a first positioning groove (9) for the first insert (26) to be embedded; the bottom end of the support ring (22) is fixedly connected to a second insert (27); the top end of the second positioning block (11) is provided with a second positioning groove (10) for the second insert (27) to be embedded; The right end of the support ring (22) is fixedly connected to a docking block (24), and the right end of the docking block (24) is fixedly connected to a hook plate (25) of the same height. The left end of the traction rod (17) is provided with a docking groove (20) for the docking block (24) and the hook plate (25) to be embedded. The wall surface of the docking groove (20) is rotatably connected to a baffle plate (21) via a torsion spring, and the distance between the top end of the baffle plate (21) and the top of the wall of the docking groove (20) is greater than the height of the docking block (24); The upper and lower end surfaces of the traction rod (17) are both provided with limiting grooves (18); the limiting groove (18) at the upper end of the traction rod (17) is used for limiting sliding of the first positioning block (8); the limiting groove (18) at the lower end of the traction rod (17) is used for limiting sliding of the second positioning block (11); the upper end of the traction rod (17) is provided with a guide inclined surface (19) at a position located at the left end of the limiting groove (18); the guide inclined surface (19) is used for guiding the first positioning block (8) to move upward; The lower bracket assembly comprises a supporting chassis (2), a first support rod (3) and a second U-shaped rod (12); the supporting chassis (2) is fixedly connected to the surface of the measuring device (1); the first support rod (3) is vertically fixedly connected to the top of the supporting chassis (2); the second U-shaped rod (12) is fixedly connected to the middle position of the supporting chassis (2); and the second positioning block (11) is vertically fixedly connected to the middle position of the second U-shaped rod (12); The upper bracket assembly comprises a second support rod (6), a first U-shaped rod (7) and a connecting rod (29), the first U-shaped rod (7) is fixedly connected to the middle position of the connecting rod (29), the first positioning block (8) is vertically fixedly connected to the middle position of the first U-shaped rod (7), the second support rod (6) is vertically fixedly connected to the bottom end of the connecting rod (29), and the second support rod (6) and the first support rod (3) are movably connected; The top end of the first support rod (3) is fixedly connected to a T-shaped rod (4), and the bottom end of the second support rod (6) is provided with a T-shaped slot (5) for the T-shaped rod (4) to move up and down; The right end of the second U-shaped rod (12) is movably connected to a lifting rod (13); a sliding groove (14) is provided on the surface of the second U-shaped rod (12) for the lifting rod (13) to move up and down; one end of the lifting rod (13) is fixedly connected to a vertically arranged top rod (15); and the bottom wall of the second positioning groove (10) has a through hole for the top rod (15) to extend out.

2. A method for detecting NdFeB magnetic materials, characterized in that: The method is carried out using the NdFeB magnetic material detection device described in claim 1, and the specific steps are as follows: A. First, connect the measuring device (1) to the instrument with an electric wire, and then calibrate the data. Then, move the traction rod (17) from the right side to the left side of the device, and move the second positioning block (11) along the track of the limit groove (18) at the bottom of the traction rod (17). When the traction rod (17) contacts the first positioning block (8), it continues to move to the left, so that the first positioning block (8) rises along the surface of the guide slope (19), driving the first U-shaped rod (7) and the second support rod (6) to move upward, so that the T-shaped rod (4) moves along the track of the T-shaped groove (5) until the first positioning block (8) moves into the track of the limit groove (18) at the top of the traction rod (17). When the traction rod (17) moves to the left to the left side of the extension device, the movement of the traction rod (17) is stopped. B. Then, the detection block (28) is embedded into the inlay groove (23), and then the docking block (24) and the hook plate (25) are embedded into the docking groove (20), and the right side surface of the hook plate (25) is in contact with the right wall surface of the docking groove (20), and then the support ring (22) is moved downward, driving the docking block (24) and the hook plate (25) to move downward along the track of the docking groove (20), at which time the hook plate (25) is located between the baffle plate (21) and the right side wall of the docking groove (20); C. Then, the traction rod (17) is moved to the right again, which will drive the support ring (22) to move together. When the traction rod (17) drives the support ring (22) to move below the first positioning block (8), the first positioning block (8) will automatically drop without the support of the traction rod (17), so that the first positioning groove (9) covers the first insert block (26). At this time, the traction rod (17) is moved to the right again, and the support ring (22) is covered by the first positioning block (8) and no longer moves, so that the hook plate (25) and the baffle plate (21) resist each other, forcing the baffle plate (21) to rotate, so that the docking block (24) and the hook plate (25) move out of the docking groove (20). At this time, the support ring (22) stays at the center of the measuring device (1), and under the action of gravity, the support ring (22), the first positioning block (8), the first U-shaped rod (7), and the second support rod (6) all drop, so that the second insert block (27) is stuck in the second positioning groove (10), thereby fixing the support ring (22); D. Finally, remove the traction rod (17) from the right side of the measuring device (1), start the instrument to observe the data, and measure the magnetic properties of the detection block (28).

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