A magnetic shielding cabin residual magnetism testing device and its application method

Abstract

The present invention relates to a magnetic shielding cabin residual magnetism testing device and its application method, wherein the magnetic shielding cabin residual magnetism testing device is characterized by comprising: a workbench made of non-magnetic material; a first-axis displacement device disposed on the workbench and entirely made of non-magnetic material; a second-axis displacement device disposed on the first-axis displacement device and entirely made of non-magnetic material; and a third-axis displacement device disposed on the second-axis displacement device and entirely made of non-magnetic material; and a magnetic measurement sensor fixed to the third-axis displacement device via a sensor clamping device made of non-magnetic material. Compared with the prior art, the advantages of the present invention are that it is entirely made of non-magnetic material and, by optimizing the mechanical structure, effectively solves the technical problems of measurement influence caused by the magnetism of the structure itself and accuracy differences caused by structural deformation, enabling a high-precision magnetic field measurement sensor to accurately measure residual magnetic fields even in extremely weak magnetic field working environments.

Description

Technical Field

[0001] The present invention relates to the technical field of extremely weak magnetic field measurement, and in particular to a residual magnetism testing device for a magnetic shielding cabin and an application method thereof. Background Art

[0002] High-precision extremely weak magnetic field measurement sensors have extensive and important applications in high-end medical equipment testing, aerospace, resource and energy exploration, national defense, and geological disaster monitoring. In particular, as China vigorously develops zero-magnetic science and builds major scientific and technological infrastructure for extremely weak magnetic fields, future zero-magnetic medicine, zero-magnetic biology, zero-magnetic chemistry, zero-magnetic basic physics, and materials science will focus on utilizing extremely weak magnetic measurement technology. Mastering extremely weak magnetic field test devices and their test methods is crucial. Currently, after being shielded by a magnetic shielding device, the residual magnetic field can reach 10- 15 T level (the Earth's magnetic field is 10- 6 T level).

[0003] Currently, most common displacement test devices use metal displacement testers, which are inherently magnetic and lack the necessary capabilities to test the residual magnetism within a magnetically shielded chamber. Furthermore, their limited range prevents them from measuring the residual magnetic field within the chamber or searching for uniform areas. By replacing metal displacement testers with non-magnetic materials and scientifically designing their mechanical structure, the technical challenges of testing inaccuracies caused by inherent magnetic properties and structural deformation can be effectively addressed. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a magnetic shielding cabin residual magnetism testing device for the above-mentioned prior art, which can enable a high-precision magnetic field measurement sensor to still accurately measure the residual magnetic field in an extremely weak magnetic field working environment.

[0005] The second technical problem to be solved by the present invention is to provide an application method of the above-mentioned magnetic shielding cabin residual magnetism testing device in view of the above-mentioned prior art.

[0006] The technical solution adopted by the present invention to solve the first technical problem is: a magnetic shielding cabin residual magnetism testing device, characterized by comprising:

[0007] The workbench is made of non-magnetic materials;

[0008] A first axis displacement device is provided on the workbench and is made entirely of non-magnetic material. The first axis displacement device includes a first axis mounting seat and a first axis guide rail. The first axis guide rail is fixed to the workbench, and the length direction of the first axis guide rail is distributed along the first direction. The first axis mounting seat is movably connected to the first axis guide rail and can move back and forth along the length direction of the first axis guide rail.

[0009] A second axis displacement device, which is entirely made of non-magnetic material and is disposed on the first axis mounting seat, includes a second axis mounting seat and a second axis guide rail. The second axis guide rail is fixed to the first axis mounting seat, and the length direction of the second axis guide rail is distributed along the second direction. The second axis mounting seat is movably connected to the second axis guide rail and can reciprocate along the length direction of the second axis guide rail. The second direction forms an angle with the first direction.

[0010] A third-axis displacement device, entirely made of non-magnetic material, is disposed on the second-axis mounting seat. The third-axis displacement device includes a third-axis mounting seat and a third-axis guide rail. The third-axis guide rail is fixed to the second-axis mounting seat. The length direction of the third-axis guide rail is distributed along a third direction. The third-axis mounting seat is movably connected to the third-axis guide rail and can reciprocate along the length direction of the third-axis guide rail. The third direction is perpendicular to the first direction and also perpendicular to the second direction.

[0011] The magnetic measuring sensor is fixed on the third axis mounting base by a sensor clamping device made of non-magnetic material.

[0012] As an improvement, the first-axis displacement device also includes a first-axis fixing seat, a first transmission screw and a first handwheel, wherein the first-axis fixing seat is fixed to the workbench with engineering plastic screws; the first-axis guide rail is made of non-magnetic and lubrication-free fiber composite material and is fixed to the first-axis fixing seat with engineering plastic screws; the first transmission screw is provided with an external thread, and the first-axis mounting seat is provided with an internal thread, the external thread on the first transmission screw and the internal thread on the first-axis mounting seat cooperate with each other, the first transmission screw and the first-axis guide rail are arranged in parallel and spaced apart, the first handwheel is connected to one end of the first transmission screw, and by shaking the first handwheel, the first-axis mounting seat is moved back and forth in the first direction relative to the first transmission screw and the first-axis guide rail; a scale line can be set on the first fixing seat or the first-axis guide rail to control the precise movement of the first-axis mounting seat.

[0013] Further improvement, the first handwheel is fixed to one end of the first transmission screw by a first screw clamp, and the other end of the first transmission screw is mounted in a bearing mounting seat using a ceramic bearing; the lower end surface of the first shaft mounting seat is provided with a dovetail notch structure, and the first shaft guide rail is slidingly connected to the dovetail notch structure.

[0014] Further improvement, the second axis displacement device also includes a second axis fixing seat, a second transmission screw and a second hand wheel, wherein the second axis fixing seat is fixed to the first axis mounting seat with engineering plastic screws; the second axis guide rail is made of non-magnetic and lubrication-free fiber composite material, and is fixed to the second axis fixing seat with engineering plastic screws; the second transmission screw is provided with an external thread, and the second axis mounting seat is provided with an internal thread, the external thread on the second transmission screw and the internal thread on the second axis mounting seat cooperate with each other, the second transmission screw and the second axis guide rail are arranged in parallel and spaced apart, the second hand wheel is connected to one end of the second transmission screw, and the second axis mounting seat is moved back and forth in the second direction relative to the second transmission screw and the second axis guide rail by shaking the second hand wheel; scale lines can be set on the second fixing seat or the second axis guide rail to control the precise movement of the second axis mounting seat.

[0015] Further improvement, the second handwheel is fixed to one end of the second transmission screw by a second screw clamp, and the other end of the second transmission screw is mounted in the bearing mounting seat using a ceramic bearing; the lower end surface of the second shaft mounting seat is provided with a dovetail notch structure, and the second shaft guide rail is slidingly connected to the dovetail notch structure.

[0016] Further improvement, the third-axis displacement device also includes a third-axis fixed seat, a third transmission screw and a third handwheel, wherein the third-axis fixed seat is fixed on the second-axis mounting seat; the third-axis guide rail is made of non-magnetic and lubrication-free fiber composite material and is fixed to the third-axis fixed seat by engineering plastic screws; the third transmission screw is provided with an external thread, and the third-axis mounting seat is provided with an internal thread, the external thread on the third transmission screw and the internal thread on the third-axis mounting seat cooperate with each other, the third transmission screw and the third-axis guide rail are arranged in parallel and spaced apart, the third handwheel is connected to one end of the third transmission screw, and by shaking the third handwheel, the third-axis mounting seat is moved back and forth in the third direction relative to the third transmission screw and the third-axis guide rail; scale lines can be set on the third fixed seat or the third-axis guide rail to control the precise movement of the third-axis mounting seat.

[0017] Further improvement, the third handwheel is fixed to one end of the third transmission screw by a third screw clamp, and the other end of the third transmission screw is mounted in the bearing mounting seat using a ceramic bearing; the lower end surface of the third shaft mounting seat is provided with a dovetail notch structure, and the third shaft guide rail is slidably connected to the dovetail notch structure.

[0018] As a further improvement, a reinforcing connection support plate is provided between the third shaft fixing seat and the second shaft mounting seat to enhance the stability of the connection.

[0019] Further improvement is made, a standard coordinate system is established with the plane where the workbench is located as the reference plane, the first direction is the X direction of the standard coordinate system, the second direction is the Y direction of the standard coordinate system, and the third direction is the Z direction of the standard coordinate system.

[0020] The technical solution adopted by the present invention to solve the second technical problem is: an application method of the magnetic shielding cabin residual magnetism testing device is used to test the uniform area in the magnetic shielding cabin, which is characterized by comprising the following steps:

[0021] Step 1: Install the magnetic measurement sensor on the sensor clamping device and place the entire device in a magnetic shielding cabin;

[0022] Step 2: With the geometric center point of the magnetic shielding cabin as the center and the unit spacing of n×n×n, the residual magnetic field strength of n×n×n measurement points in the N×N×N cube area is obtained by moving the first axis displacement device, the second axis displacement device, and the third axis displacement device, respectively, and recorded as P ix+ , where n and N are both positive integers, the unit is cm, N is a multiple of n, i = 1, 2, ... n × n × n;

[0023] Step 3: Flip the magnetic measurement sensor 180 degrees in a plane parallel to the plane where the X-axis and Y-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the above n×n×n measurement points, respectively, and record them as P ix- ;

[0024] Step 4: Flip the magnetic sensor 90 degrees in a plane parallel to the plane where the X-axis and Y-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iy+ ;

[0025] Step 5: Flip the magnetic sensor 180 degrees in a plane parallel to the plane where the X-axis and Y-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iy- ;

[0026] Step 6: Flip the magnetic sensor 90 degrees in a plane parallel to the plane where the X-axis and Z-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iz+ ;

[0027] Step 7: Flip the magnetic sensor 180 degrees in a plane parallel to the plane where the X-axis and Z-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iz- ;

[0028] Step 8: Calculate the actual residual magnetic field M at a total of n×n×n measurement points within the N×N×N cube area using the following formula: i :

[0029]

[0030] Step 9: According to the calculation results of step 7, if the actual residual magnetic field M of n×n×n measuring points i If the actual residual magnetic field M at n×n×n measurement points is within the preset range, the N×N×N cube area is output as the target uniform area. i If the actual residual magnetic field of a certain point is not within the preset range, reduce the value of n and repeat steps 2-8 until the actual residual magnetic field M of all n×n×n measurement points is i are all within the preset range, and then the obtained N×N×N cube area is output as the target uniform area.

[0031] Compared with the existing technology, the advantages of the present invention are: the whole is made of non-magnetic material, and at the same time, by optimizing the mechanical structure, it effectively solves the technical problems of measurement influence caused by the magnetism of the structure itself and poor accuracy caused by structural deformation, and can enable high-precision magnetic field measurement sensors to accurately measure the residual magnetic field in an extremely weak magnetic field working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the three-dimensional structure of the residual magnetism testing device for a magnetic shielding cabin in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1 The residual magnetism testing device for a magnetic shielding cabin shown in the figure comprises:

[0035] A workbench 1 made of non-magnetic material;

[0036] A first-axis displacement device made of a non-magnetic material as a whole is arranged on the workbench 1. The first-axis displacement device includes a first-axis mounting seat 11, two first-axis guide rails 12 arranged in parallel and spaced apart, a first-axis fixing seat 13, a first transmission screw 14 and a first handwheel 15, wherein the first-axis fixing seat 13 is fixed to the workbench 1 with engineering plastic screws, and the first-axis fixing seat 13 is made of thermoplastic engineering plastic POM. The first-axis guide rail 12 is made of a non-magnetic lubrication-free fiber composite material, which is extremely light in weight, 25% lighter than an aluminum guide rail and 75% lighter than a steel guide rail. The first-axis guide rail 12 is fixed to the first-axis fixing seat 13 by engineering plastic screws, and the length direction of the first-axis guide rail 12 is distributed along the first direction. The first-axis mounting seat 11 is movably connected to the first-axis guide rail 12 and can move back and forth along the length direction of the first-axis guide rail. The first-axis mounting seat 11 is made of a non-magnetic lubrication-free fiber composite material. The first shaft mounting seat 11 is extremely light in weight, and a dovetail notch structure is provided on the lower end surface of the first shaft mounting seat 11, and the first shaft guide rail 12 is slidably connected to the dovetail notch structure; the first transmission screw 14 is arranged between the two first shaft guide rails 12, and the first transmission screw 14 is arranged parallel to the two first shaft guide rails 12. The first transmission screw 14 adopts a hollow carbon fiber structure with high strength and extremely light weight. The first transmission screw 14 is provided with an external thread, and the first shaft mounting seat 13 is provided with an internal thread. The external thread 14 on the first transmission screw and the internal thread on the first shaft mounting seat 13 cooperate with each other; the first handwheel 15 is fixed to one end of the first transmission screw 14 by a first screw clamp 16, and the other end of the first transmission screw 14 is mounted in the first bearing mounting seat 17 with a ceramic bearing. By shaking the first handwheel 15, the first shaft mounting seat 11 can be accurately moved back and forth in the first direction relative to the first transmission screw 14 and the first shaft guide rail 12;

[0037] A second-axis displacement device is arranged on the first-axis mounting seat 13 and is made of a non-magnetic material as a whole. The second-axis displacement device includes a second-axis mounting seat 21, two second-axis guide rails 22 arranged in parallel and spaced apart, a second-axis fixing seat 23, a second transmission screw 24 and a second handwheel 25, wherein the second-axis fixing seat 23 is fixed to the first-axis mounting seat 11 with engineering plastic screws, the second-axis fixing seat 23 is made of thermoplastic engineering plastic, the second-axis guide rail 22 is made of non-magnetic lubrication-free fiber composite material, the second-axis guide rail 22 is fixed to the second-axis fixing seat 23 with engineering plastic screws, the length direction of the second-axis guide rail 22 is distributed along the second direction, the second-axis mounting seat 21 is movably connected to the second-axis guide rail 22, and can move back and forth along the length direction of the second-axis guide rail 22, the second-axis mounting seat 21 is made of non-magnetic lubrication-free fiber composite material, and the lower end surface of the second-axis mounting seat 21 A dovetail notch structure is provided, and the second shaft guide rail 22 is slidably connected to the dovetail notch structure; a second transmission screw 24 is arranged between the two second shaft guide rails 22, and the second transmission screw 24 is arranged parallel to the two second shaft guide rails 22. The second transmission screw 24 adopts a hollow carbon fiber structure, and an external thread is provided on the second transmission screw 24. The second shaft mounting seat 23 is provided with an internal thread. The external thread 24 on the second transmission screw and the internal thread on the second shaft mounting seat 23 cooperate with each other; a second handwheel 25 is fixed to one end of the second transmission screw 24 by a second screw clamp 26, and the other end of the second transmission screw 24 is mounted in the second bearing mounting seat 27 with a ceramic bearing. By shaking the second handwheel 25, the second shaft mounting seat 21 can be accurately moved back and forth in the second direction relative to the second transmission screw 24 and the second shaft guide rail 22; the second direction is perpendicular to the first direction;

[0038] A third-axis displacement device made of a non-magnetic material as a whole is arranged on the second-axis mounting seat 21. The third-axis displacement device includes a third-axis mounting seat 31, a third-axis guide rail 32, a third-axis fixing seat 33, a third transmission screw 34 and a third handwheel 35, wherein the third-axis fixing seat 33 is fixed to the second-axis mounting seat 21 with engineering plastic screws, the third-axis fixing seat 33 is made of thermoplastic engineering plastic, the third-axis guide rail 32 is made of non-magnetic lubrication-free fiber composite material, the third-axis guide rail 32 is fixed to the third-axis fixing seat 33 by engineering plastic screws, the length direction of the third-axis guide rail 32 is distributed along the third direction, the third-axis mounting seat 31 is movably connected to the third-axis guide rail 32, and can move back and forth accurately along the length direction of the third-axis guide rail 32, the third-axis mounting seat 31 is made of non-magnetic lubrication-free fiber composite material, and the lower end face of the third-axis mounting seat 31 is provided with a dovetail notch structure. The guide rail 32 is slidably connected to the dovetail groove structure; the third transmission screw 34 is arranged parallel to the third axis guide rail 32, and the third transmission screw 34 adopts a hollow carbon fiber structure. The third transmission screw 34 is provided with an external thread, and the third axis mounting seat 33 is provided with an internal thread. The external thread 34 on the third transmission screw and the internal thread on the third axis mounting seat 33 cooperate with each other; the third handwheel 35 is fixed to one end of the third transmission screw 34 through a third screw clamp 36, and the other end of the third transmission screw 34 is mounted in the third bearing mounting seat 37 with a ceramic bearing. By shaking the third handwheel 35, the third axis mounting seat 31 can be accurately moved back and forth in the second direction relative to the third transmission screw 34 and the third axis guide rail 32; the third direction is perpendicular to the second direction and the first direction at the same time; the third axis fixing seat 33 is provided with a reinforcing connection support plate 38 for strengthening the connection stability between it and the second axis mounting seat 21.

[0039] The magnetic measurement sensor 4 is fixed on the third shaft mounting seat 31 through a sensor clamping device 5 made of non-magnetic material.

[0040] In this embodiment, a standard coordinate system is established with the plane where the workbench 1 is located as the reference plane, the first direction is the X direction of the standard coordinate system, the second direction is the Y direction of the standard coordinate system, and the third direction is the Z direction of the standard coordinate system.

[0041] The application method of the magnetic shielding cabin residual magnetism testing device can be used to test the uniform area in the magnetic shielding cabin, which includes the following steps:

[0042] Step 1: Install the magnetic measurement sensor on the sensor clamping device and place the entire device in a magnetic shielding cabin;

[0043] Step 2: With the geometric center point of the magnetic shielding cabin as the center and the unit spacing of n×n×n, the residual magnetic field strength of n×n×n measurement points in the N×N×N cube area is obtained by moving the first axis displacement device, the second axis displacement device, and the third axis displacement device, respectively, and recorded as P ix+ , where n and N are both positive integers, the unit is cm, N is a multiple of n, i = 1, 2, ... n × n × n;

[0044] Step 3: Flip the magnetic measurement sensor 180 degrees in a plane parallel to the plane where the X-axis and Y-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the above n×n×n measurement points, respectively, and record them as P ix- ;

[0045] Step 4: Flip the magnetic sensor 90 degrees in a plane parallel to the plane where the X-axis and Y-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iy+ ;

[0046] Step 5: Flip the magnetic sensor 180 degrees in a plane parallel to the plane where the X-axis and Y-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iy- ;

[0047] Step 6: Flip the magnetic sensor 90 degrees in a plane parallel to the plane where the X-axis and Z-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iz+ ;

[0048] Step 7: Flip the magnetic sensor 180 degrees in a plane parallel to the plane where the X-axis and Z-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iz- ;

[0049] Step 8: Calculate the actual residual magnetic field M at a total of n×n×n measurement points within the N×N×N cube area using the following formula: i :

[0050]

[0051] Step 9: According to the calculation results of step 7, if the actual residual magnetic field M of n×n×n measuring points i If the actual residual magnetic field M at n×n×n measurement points is within the preset range, the N×N×N cube area is output as the target uniform area. i If the actual residual magnetic field of a certain point is not within the preset range, reduce the value of n and repeat steps 2-8 until the actual residual magnetic field M of all n×n×n measurement points is i are all within the preset range, and then the obtained N×N×N cube area is output as the target uniform area.

Claims

1. A magnetic shielding cabin residual magnetism testing device, characterized in that include: The workbench is made of non-magnetic materials; A first axis displacement device is provided on the workbench and is made entirely of non-magnetic material. The first axis displacement device includes a first axis mounting seat and a first axis guide rail. The first axis guide rail is fixed to the workbench, and the length direction of the first axis guide rail is distributed along the first direction. The first axis mounting seat is movably connected to the first axis guide rail and can move back and forth along the length direction of the first axis guide rail. A second axis displacement device is provided on the first axis mounting seat and is entirely made of non-magnetic material. The second axis displacement device includes a second axis mounting seat and a second axis guide rail. The second axis guide rail is fixed to the first axis mounting seat. The length direction of the second axis guide rail is distributed along the second direction. The second axis mounting seat is movably connected to the first axis guide rail and can reciprocate along the length direction of the second axis guide rail. The second direction forms an angle with the first direction. A third-axis displacement device, entirely made of non-magnetic material, is disposed on the second-axis mounting seat. The third-axis displacement device includes a third-axis mounting seat and a third-axis guide rail. The third-axis guide rail is fixed to the second-axis mounting seat. The length direction of the third-axis guide rail is distributed along a third direction. The third-axis mounting seat is movably connected to the third-axis guide rail and can reciprocate along the length direction of the third-axis guide rail. The third direction is perpendicular to the first direction and also perpendicular to the second direction. A magnetic measurement sensor is fixed to the third axis mounting base by a sensor clamping device made of non-magnetic material; The first axis displacement device further includes a first axis fixing seat, a first transmission screw and a first hand wheel, wherein the first axis fixing seat is fixed to the workbench with engineering plastic screws; the first axis guide rail is made of a non-magnetic and lubrication-free fiber composite material and is fixed to the first axis fixing seat with engineering plastic screws; the first transmission screw is provided with an external thread, and the first axis mounting seat is provided with an internal thread, the external thread on the first transmission screw and the internal thread on the first axis mounting seat cooperate with each other, the first transmission screw and the first axis guide rail are arranged parallel and spaced apart, the first hand wheel is connected to one end of the first transmission screw, and by shaking the first hand wheel, the first axis mounting seat is moved back and forth in the first direction relative to the first transmission screw and the first axis guide rail; The second-axis displacement device also includes a second-axis fixing seat, a second transmission screw and a second handwheel, wherein the second-axis fixing seat is fixed to the first-axis mounting seat with engineering plastic screws; the second-axis guide rail is made of non-magnetic and lubrication-free fiber composite material and is fixed to the second-axis fixing seat with engineering plastic screws; the second transmission screw is provided with an external thread, and the second-axis mounting seat is provided with an internal thread, the external thread on the second transmission screw and the internal thread on the second-axis mounting seat cooperate with each other, the second transmission screw and the second-axis guide rail are arranged in parallel and spaced apart, the second handwheel is connected to one end of the second transmission screw, and by shaking the second handwheel, the second-axis mounting seat is moved back and forth in the second direction relative to the second transmission screw and the second-axis guide rail.

2. The magnetic shielding cabin residual magnetism testing device according to claim 1, characterized in that: The first handwheel is fixed to one end of the first transmission screw by a first screw clamp, and the other end of the first transmission screw is mounted in a bearing mounting seat using a ceramic bearing; a dovetail notch structure is provided on the lower end surface of the first shaft mounting seat, and the first shaft guide rail is slidably connected to the dovetail notch structure.

3. The magnetic shielding cabin residual magnetism testing device according to claim 1, characterized in that: The second handwheel is fixed to one end of the second transmission screw by a second screw clamp, and the other end of the second transmission screw is mounted in the bearing mounting seat using a ceramic bearing; the lower end surface of the second shaft mounting seat is provided with a dovetail notch structure, and the second shaft guide rail is slidably connected to the dovetail notch structure.

4. The magnetic shielding cabin residual magnetism testing device according to claim 1, characterized in that: The third-axis displacement device also includes a third-axis fixing seat, a third transmission screw and a third handwheel, wherein the third-axis fixing seat is fixed to the second-axis mounting seat with engineering plastic screws; the third-axis guide rail is made of non-magnetic and lubrication-free fiber composite material and is fixed to the third-axis fixing seat with engineering plastic screws; the third transmission screw is provided with an external thread, and the third-axis mounting seat is provided with an internal thread, the external thread on the third transmission screw and the internal thread on the third-axis mounting seat cooperate with each other, the third transmission screw and the third-axis guide rail are arranged in parallel and spaced apart, the third handwheel is connected to one end of the third transmission screw, and by shaking the second handwheel, the third-axis mounting seat is moved back and forth in the third direction relative to the third transmission screw and the third-axis guide rail.

5. The magnetic shielding cabin residual magnetism testing device according to claim 4, characterized in that: The third hand wheel is fixed to one end of the third transmission screw by a third screw clamp, and the other end of the second transmission screw is fixedly connected to the second shaft mounting seat; the lower end surface of the third shaft mounting seat is provided with a dovetail notch structure, and the third shaft guide rail is slidably connected to the dovetail notch structure.

6. The magnetic shielding cabin residual magnetism testing device according to claim 4, characterized in that: A reinforcing connection support plate is provided between the third shaft fixing seat and the second shaft mounting seat for enhancing the stability of the connection.

7. The magnetic shielding cabin residual magnetism testing device according to claim 1, characterized in that: A standard coordinate system is established with the plane where the workbench is located as a reference plane, the first direction is the X direction of the standard coordinate system, the second direction is the Y direction of the standard coordinate system, and the third direction is the Z direction of the standard coordinate system.

8. An application method of the magnetic shielding cabin residual magnetism testing device according to claim 7, for testing the uniform area in the magnetic shielding cabin, characterized in that The steps include: Step 1: Install the magnetic measurement sensor on the sensor clamping device and place the entire device in a magnetic shielding cabin; Step 2: With the geometric center point of the magnetic shielding cabin as the center and the unit spacing of n×n×n, the residual magnetic field strength of n×n×n measurement points in the N×N×N cube area is obtained by moving the first axis displacement device, the second axis displacement device, and the third axis displacement device, respectively, and recorded as P ix+ , where n and N are both positive integers, the unit is cm, N is a multiple of n, i = 1, 2, ... n × n × n; Step 3: Flip the magnetic measurement sensor 180 degrees in a plane parallel to the plane where the X-axis and Y-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the above n×n×n measurement points, respectively, and record them as P ix- ; Step 4: Flip the magnetic sensor 90 degrees in a plane parallel to the plane where the X-axis and Y-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iy+ ; Step 5: Flip the magnetic sensor 180 degrees in a plane parallel to the plane where the X-axis and Y-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iy- ; Step 6: Flip the magnetic sensor 90 degrees in a plane parallel to the plane where the X-axis and Z-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iz+ ; Step 7: Flip the magnetic sensor 180 degrees in a plane parallel to the plane where the X-axis and Z-axis are located, and then move the first axis displacement device, the second axis displacement device, and the third axis displacement device to obtain the residual magnetic field strength of the n×n×n measurement points, respectively, and record them as P iz- ; Step 8: Calculate the actual residual magnetic field M at a total of n×n×n measurement points within the N×N×N cube area using the following formula: i : Step 9: According to the calculation results of step 7, if the actual residual magnetic field M of n×n×n measuring points i If the actual residual magnetic field M at n×n×n measurement points is within the preset range, the N×N×N cube area is output as the target uniform area. i If the actual residual magnetic field of a certain point is not within the preset range, reduce the value of n and repeat steps 2-8 until the actual residual magnetic field M of all n×n×n measurement points is i are all within the preset range, and then the obtained N×N×N cube area is output as the target uniform area.

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