Zero magnetic shielding device and use method thereof

Abstract

The invention discloses a zero magnetic shielding device and a use method thereof, and the device comprises a magnetic shielding cylinder which is composed of a shielding cylinder body and a shielding cover detachably connected with the shielding cylinder body. And the non-magnetic multifunctional test frame is arranged in the magnetic shielding cylinder and consists of an arc-shaped seat, a lifting mechanism, a test bedplate, a track, a storage rack, a Helmholtz coil and a folding nylon magnetic sensing assembly. When the magnetic flux and residual magnetism switching test is carried out on the object to be tested in the magnetic shielding cylinder, the non-magnetic multifunctional test frame does not need to be replaced, the efficiency of the magnetic flux and residual magnetism switching test on the object to be tested in the magnetic shielding cylinder is improved, and the advantage of convenient switching test is achieved. And the method has the advantages of high measurement precision and wide application range.

Description

Technical Field

[0001] The present invention relates to the field of magnetic shielding, and in particular to a zero-magnetic shielding device and a method of using the same. Background Art

[0002] Magnetic shielding tubes achieve magnetic field shielding through the high magnetic permeability of Permalloy. Because Permalloy's magnetic permeability is thousands of times that of air, its magnetic resistance is much lower than that of the internal space. The magnetic lines of force of the external magnetic field are mainly transmitted along the walls of the shielding tube, with only a very small amount entering the internal space. This flux shunting effect creates a near-zero magnetic field environment inside the shielding tube, effectively blocking interference from the geomagnetic field. This provides a near-zero magnetic field test environment for near-zero or weak magnetic field testing of related instruments. However, the disadvantage is that when using existing magnetic shielding tubes, test frames of different structures must be installed inside them to perform magnetic flux or residual magnetism testing on the object to be tested. This makes switching between test frames inconvenient, affecting test efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a zero-magnetic shielding device and a method of using the same, so as to solve the problem that when performing magnetic flux and residual magnetism tests on traditional magnetic shielding cylinders, it is necessary to switch between test frames of different structures, which causes inconvenience in switching and affects test efficiency.

[0004] In order to solve the above technical problems, the present invention provides a zero-magnetic shielding device, comprising: A magnetic shielding cylinder, comprising a shielding cylinder body and a detachably connected shielding cover; A non-magnetic multifunctional test frame is installed in the magnetic shielding cylinder and includes an arc-shaped seat installed in the magnetic shielding cylinder, a test table located above the arc-shaped seat in a horizontal plane, a lifting mechanism hinged between the arc-shaped seat and the test table, a track provided on the test table along its length, a storage rack slidably provided on the track, and a Helmholtz coil placed on the storage rack for measuring the magnetic flux of an object to be tested placed in the Helmholtz coil; the frame also includes a foldable nylon magnetic sensor assembly provided on the arc-shaped seat, which, when in an unfolded state, passes through an opening reserved in the test table and is located above the storage rack for measuring the residual magnetism of an object to be tested placed on the storage rack; when performing a magnetic flux test, the foldable nylon magnetic sensor assembly is retracted from the opening reserved in the test table and returned to the arc-shaped seat when in a folded state.

[0005] Furthermore, the present invention provides a zero-magnetic shielding device, wherein the shielding cylinder includes an inner cylinder and an outer cylinder, the inner cylinder is composed of five layers of permalloy cylinders, a demagnetization coil is wound on the outer wall of the innermost layer of permalloy cylinder, both ends of the demagnetization coil extend outside the shielding cylinder for connection to the demagnetizer, the outer cylinder is an aluminum cylinder, and adjacent two layers of cylinders are isolated by foam filling; the shielding cover includes an embedded shielding inner cover and a protective outer cover, the shielding inner cover is a two-layer embedded permalloy cover, the protective outer cover is an aluminum cover, two handles are symmetrically provided on the protective outer cover, and adjacent two layers of covers are isolated by foam filling; the protective outer cover is hermetically installed on the outer cylinder, and the shielding inner cover is sealed in the cavity between any three layers of permalloy cylinders between the innermost layer and the outermost layer of the inner cylinder; the inner cylinder is provided with a sealing ring surrounding the cavity between any two adjacent layers of permalloy cylinders at one end where the shielding inner cover is installed.

[0006] Furthermore, in the zero-magnetic shielding device provided by the present invention, the lifting mechanism is a scissor-type lifting frame, and a handle is provided on the test table for controlling the scissor-type lifting frame to rise and fall relative to the arc seat by pulling the test table.

[0007] Furthermore, the zero magnetic shielding device provided by the present invention, the foldable nylon magnetic sensor assembly includes a support fixedly set on the arc-shaped seat, an adjusting rod hinged on the support, a nylon magnetic sensor connected to the upper end of the adjusting rod, a pull rod hinged on the adjusting rod close to the support, and one end of the pull rod extending out of the arc-shaped seat is connected to a handle; when the pull rod is pulled outward by the handle, the adjusting rod and the nylon magnetic sensor connected to it flip to a horizontal state, and when the pull rod is pushed inward by the handle, the adjusting rod and the nylon magnetic sensor connected to it flip to a vertical state.

[0008] Furthermore, the zero-magnetic shielding device provided by the present invention further includes: The bracket comprises a movable frame body and a cylinder frame connected thereto, and the magnetic shielding cylinder is detachably connected to the cylinder frame.

[0009] In order to solve the above technical problems, the present invention also provides a method for using a zero-magnetic shielding device, including a magnetic flux testing method and a residual magnetism testing method. The magnetic flux testing method comprises: Open the shielding cover installed on the shielding cylinder of the magnetic shielding cylinder to put the magnetic shielding cylinder in an open state, place the Helmholtz coil on the storage rack, place the object to be measured in the Helmholtz coil, slide the storage rack, the Helmholtz coil on it, and the object to be measured in it along the track to a predetermined area of ​​the shielding cylinder, and measure the magnetic flux of the object to be measured through the Helmholtz coil; The residual magnetism testing method comprises: Open the shielding cover installed on the shielding cylinder of the magnetic shielding cylinder, take out the Helmholtz coil on the rack, place the object to be measured on the rack, control the folding nylon magnetic sensor assembly to be in the unfolded state, slide the rack and the object to be measured on it along the track to the detection area of ​​the folding nylon magnetic sensor assembly, close and install the shielding cover, so that the magnetic shielding cylinder is in the closed state, and measure the residual magnetism of the object to be measured on the rack through the folding nylon magnetic sensor assembly.

[0010] In order to solve the above technical problems, the present invention also provides a method for using a zero-magnetic shielding device, including a demagnetization method for the zero-magnetic shielding device, a magnetic flux testing method, and a residual magnetism testing method. The zero-magnetic shielding device demagnetization method comprises: The innermost permalloy cylinder of the shielding cylinder is demagnetized by turning on the power supply through the demagnetization coil wound on the outer wall of the innermost permalloy cylinder; The magnetic flux testing method comprises: Open the shielding cover installed on the shielding cylinder of the magnetic shielding cylinder to put the magnetic shielding cylinder in an open state, place the Helmholtz coil on the storage rack, place the object to be measured in the Helmholtz coil, slide the storage rack, the Helmholtz coil on it, and the object to be measured in it along the track to a predetermined area of ​​the shielding cylinder, and measure the magnetic flux of the object to be measured through the Helmholtz coil; The residual magnetism testing method comprises: Open the shielding cover installed on the shielding cylinder of the magnetic shielding cylinder, take out the Helmholtz coil on the rack, place the object to be measured on the rack, control the folding nylon magnetic sensor assembly to be in the unfolded state, slide the rack and the object to be measured on it along the track to the detection area of ​​the folding nylon magnetic sensor assembly, close and install the shielding cover, so that the magnetic shielding cylinder is in the closed state, and measure the residual magnetism of the object to be measured on the rack through the folding nylon magnetic sensor assembly.

[0011] Furthermore, the method for using the zero-magnetic shielding device provided by the present invention demagnetizes the innermost permalloy cylinder of the shielding cylinder before performing a magnetic flux or residual magnetism test on the object to be tested.

[0012] Furthermore, the present invention provides a method for using the zero magnetic shielding device. In the residual magnetism testing method, before measuring the residual magnetism of the object to be tested on the rack, the height of the test table and the track, rack, and object to be tested thereon are adjusted by adjusting the height of the lifting mechanism so that the object to be tested enters the recognition area of ​​the nylon magnetic sensor of the foldable nylon magnetic sensor assembly.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The zero magnetic shielding device and the use method provided by the present invention are as follows: when performing a magnetic flux test of an object to be tested in a magnetic shielding cylinder, the shielding cover is removed, the object to be tested is placed in a Helmholtz coil, a storage rack, the Helmholtz coil thereon, and the object to be tested therein are slid along a track into a predetermined area of ​​the shielding cylinder, so that the magnetic flux of the object to be tested is measured by the Helmholtz coil when the magnetic shielding cylinder is in an open state; when performing a residual magnetism test, the Helmholtz coil on the storage rack is removed, the object to be tested is placed on the storage rack, the foldable nylon magnetic sensor assembly is controlled to be in an unfolded state, the object to be tested on the storage rack is slid along the track into a detection area of ​​the foldable nylon magnetic sensor assembly, so that the residual magnetism of the object to be tested is measured by the foldable nylon magnetic sensor assembly when the closed magnetic shielding cylinder is in a closed state, so that when performing a magnetic flux and residual magnetism switching test on the object to be tested in the magnetic shielding cylinder, there is no need to replace the non-magnetic conductive multifunctional test rack, thereby improving the efficiency of the magnetic flux and residual magnetism switching test of the object to be tested in the magnetic shielding cylinder, and having the advantage of convenient switching test.

[0014] The zero magnetic shielding device and its use method provided by the present invention, and the non-magnetic multifunctional test frame installed in the magnetic shielding tube are suitable for testing the magnetic flux and residual magnetism of the object to be tested, do not require switching, and are universal. They avoid the tedious process of repeatedly positioning and installing different test frames in the magnetic shielding tube when performing magnetic flux and residual magnetism switching tests in traditional magnetic shielding tubes, thereby improving the switching test efficiency of magnetic flux and residual magnetism.

[0015] The zero-magnetic shielding device and its use method provided by the present invention are non-magnetic multifunctional test frame whose height can be adjusted by a lifting mechanism in a magnetic shielding tube. On the one hand, the object to be tested can enter the detection area of ​​the residual magnetism test, thereby improving the residual magnetism measurement accuracy of the object to be tested; on the other hand, it is suitable for magnetic shielding tubes of different diameters and has the advantage of a wide range of applications.

[0016] The zero-magnetic shielding device and the use method thereof provided by the present invention have an arc-shaped arc seat of the non-magnetic multifunctional test frame, which improves the stability of the non-magnetic multifunctional test frame when it is installed as a whole in the magnetic shielding cylinder.

[0017] The zero-magnetic shielding device and its use method provided by the present invention are characterized in that the storage rack of the non-magnetic multifunctional test rack can slide along the track, and the object to be tested carried by the storage rack can be slid into the test area in the magnetic shielding cylinder for corresponding measurement, thereby improving the measurement accuracy.

[0018] The zero-magnetic shielding device and its use method provided by the present invention, when performing a magnetic flux test on an object to be tested, controls the foldable nylon magnetic sensor assembly to be in a folded state, thereby retracting the foldable nylon magnetic sensor assembly onto an arc-shaped seat, thereby preventing the foldable nylon magnetic sensor assembly from interfering with the magnetic flux measurement of the object to be tested and other adverse effects. When performing a residual magnetism test on the object to be tested, controls the foldable nylon magnetic sensor assembly to be in an unfolded state, thereby pushing the object to be tested into the detection area of ​​the foldable nylon magnetic sensor assembly to perform residual magnetism measurement. During the residual magnetism test, the Helmholtz coil is removed to prevent it from interfering with the residual magnetism test of the object to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional combined structure of the magnetic shielding tube; Figure 2 It is a schematic diagram of the three-dimensional exploded structure of the magnetic shielding tube; Figure 3 It is a schematic diagram of the partial cross-sectional structure of the shielding cylinder and the shielding cover in a closed installation state; Figure 4 This is a schematic diagram of the three-dimensional structure of the degaussing coil wound on the innermost permalloy cylinder in the inner cylinder; Figure 5 This is a schematic diagram of the three-dimensional structure in which the inner cylinder is composed of five layers of permalloy cylinders embedded in each other; Figure 6 It is a schematic diagram of the three-dimensional structure of the magnetic shielding tube and the bracket in the installed state; Figure 7 is a schematic diagram of the three-dimensional structure of the bracket; Figure 8 This is a partial cross-sectional structural diagram of a non-magnetic multifunctional test stand installed in a shielding cylinder in a residual magnetism test state; Figure 9 This is a partial cross-sectional structural diagram of a non-magnetic multifunctional test frame installed in a shielding cylinder in a magnetic flux testing state; Figure 10 This is a schematic diagram of the three-dimensional structure of the non-magnetic multifunctional test stand in the residual magnetism test state; Figure 11 It is a schematic diagram of the three-dimensional structure of the non-magnetic multifunctional test stand in the magnetic flux test state; Figure 12 It is a schematic diagram of the structure of the foldable nylon magnetic sensor assembly; As shown in the figure: 100, magnetic shielding cylinder, 110, shielding cylinder body, 111, inner cylinder body, 112, outer cylinder body, 113, foam rubber, 114, sealing ring, 115, degaussing coil, 120, shielding cover, 121, shielding inner cover, 122, protective outer cover, 123, handle; 200, non-magnetic multifunctional test stand, 210, curved seat, 220, lifting mechanism, 230, test table, 231, opening, 232, handle, 240, track, 250, storage rack, 260, Helmholtz coil, 270, foldable nylon magnetic sensor assembly, 271, support, 272, adjustment rod, 273, nylon magnetic sensor, 274, pull rod, 275, handle, 280, object to be tested; 300, bracket, 310, mobile frame, 320, drum rack. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are all in a very simplified form and are not accurately scaled, and are only used to facilitate and clearly illustrate the embodiments of the present invention.

[0021] An embodiment of the present invention provides a zero-magnetic shielding device, which includes at least a magnetic shielding tube 100 and a non-magnetic multifunctional test stand 200. Please refer to Figures 1 to 5The magnetic shielding cylinder 100 includes a shielding cylinder 110 and a detachably connected shielding cover 120. The shielding cylinder 110 includes an inner cylinder 111 and an outer cylinder 112. The inner cylinder 111 is composed of five layers of permalloy cylinders. A demagnetization coil 115 is wound on the outer wall of the innermost layer of permalloy cylinder. Both ends of the demagnetization coil 115 extend outside the shielding cylinder 110 for connection to a demagnetizer. The outer cylinder 112 is an aluminum cylinder, which is used to protect the magnetic shielding cylinder 100 and has the advantage of low cost. The adjacent two layers of cylinders are filled and isolated by foam 113. The shielding cover 120 includes an embedded multi-layer shielding inner cover 121 and a protective outer cover 122, wherein the shielding inner cover 121 can be a two-layer embedded permalloy cover, and the protective outer cover 122 is an aluminum cover. Two handles 123 are symmetrically provided on the protective outer cover 122. The handles 123 facilitate the installation and removal of the shielding cover 120 relative to the shielding cylinder 110. Adjacent covers (including the shielding inner cover 121 and the shielding inner cover 121 and the protective outer cover 122) are separated by a foam filler 113. The protective outer cover 122 is sealed and mounted on the outer cylinder 112, while the shielding inner cover 121 is sealed and mounted within the cavity between any three layers of permalloy cylinders between the innermost and outermost layers of the inner cylinder 111. The sealed connection between the shielding inner cover 121 and the inner cylinder 111 provides the overall magnetic shielding cylinder 100 with excellent shielding effectiveness. The protective outer cover 122 protects the shielding cover 120 while reducing costs. A sealing ring 114 is provided around the cavity between any two adjacent layers of permalloy cylinders at the end of the inner cylinder 111 where the shielding inner cover 121 is mounted. This sealing ring 114 provides a dustproof seal. The shielding cover 120 is in the shape of a cylinder with one end open, similar to a mineral water bottle cap. After being sealed and installed with the shielding cylinder 110 , it can improve the axial shielding effect of the magnetic shielding cylinder 100 .

[0022] Please refer to Figures 8 to 12The non-magnetic multifunctional test stand 200 is installed in the magnetic shielding tube 100 and includes an arc seat 210 installed in the magnetic shielding tube 100, a test table 230 located above the arc seat 210 and in a horizontal plane, a lifting mechanism 220 hinged between the arc seat 210 and the test table 230, a track 240 provided on the test table 230 along its length, a shelf 250 slidingly provided on the track 240, and a Helmholtz coil 260 placed on the shelf 250 for measuring the Helmholtz coil placed on the Helmholtz coil. The non-magnetic multifunctional test stand 200 is a non-magnetic multifunctional test stand 200. ... can For example, the bearings, rails, and storage racks of a scissor lift are made of ceramic, while the remaining components are made of plastic. To enable the foldable nylon magnetic sensor assembly 270 to switch between folding and unfolding, the foldable nylon magnetic sensor assembly 270 includes a support 271 fixed to the arc-shaped seat 210, an adjustment rod 272 hingedly connected to the support 271, a nylon magnetic sensor 273 such as a magnetoresistive sensor or a Hall effect sensor connected to the upper end of the adjustment rod 272, and a pull rod 274 hingedly connected to the adjustment rod 272 near the support 271. The pull rod 274 extends from the arc-shaped seat 210 and is connected to a handle 275 at one end. When the handle 275 is used to pull the pull rod 274 outward, the adjustment rod 272 and the connected nylon magnetic sensor 273 flip to a horizontal position, i.e., a folded position. When the handle 275 is used to push the pull rod 274 inward, the adjustment rod 272 and the connected nylon magnetic sensor 273 flip to a vertical position, i.e., an unfolded position. The pull rod 274 can be provided with a broken line shape, so that when the handle 275 is used to push and pull the pull rod 274 to control the adjustment rod 272 and the nylon magnetic sensor 273 thereon to be in the unfolded state or the folded state, the lifting mechanism 220 is avoided to avoid interference between the two.

[0023] Please refer to Figure 8 and Figure 9An embodiment of the present invention also provides a method for using a zero-magnetic shielding device, including a magnetic flux testing method and a residual magnetism testing method.

[0024] Please focus on Figure 9 , magnetic flux test methods, including: Open the shielding cover 120 installed on the shielding cylinder 110 of the magnetic shielding cylinder 100, so that the magnetic shielding cylinder 100 is in an open state, place the Helmholtz coil 260 on the storage rack 250, place the object to be measured 280 in the Helmholtz coil 260, slide the storage rack 250, the Helmholtz coil 260 thereon, and the object to be measured 280 therein along the track 240 to a predetermined area of ​​the shielding cylinder 110, and measure the magnetic flux of the object to be measured 280 by the Helmholtz coil 260. At this time, the foldable nylon magnetic sensor assembly 270 is in a folded state. The Helmholtz coil 260 needs to be connected to a magnetic flux testing device to measure the magnetic flux of the object to be measured 280, wherein the magnetic flux testing device adopts well-known technology, including but not limited to a fluxmeter or Hall sensor connected to the signal output end of the Helmholtz coil 260, and a constant current power supply that provides a stable current to the Helmholtz coil. In this case, the magnetic shielding cylinder 100 may be provided with a harness hole for a magnetic flux testing device connected to the Helmholtz coil 260 .

[0025] Please focus on Figure 8 , residual magnetism test method, including: The shielding cover 120 mounted on the shielding cylinder 110 of the magnetic shielding cylinder 100 is opened, the Helmholtz coil 260 on the rack 250 is removed, and the object to be tested 280 is placed on the rack 250. The foldable nylon magnetic sensor assembly 270 is controlled to be in an unfolded state, and the rack 250 and the object to be tested 280 thereon are slid along the track 240 to the detection area of ​​the foldable nylon magnetic sensor assembly 270. The shielding cover 120 is then installed to close the magnetic shielding cylinder 100, and the residual magnetism of the object to be tested 280 on the rack 250 is measured using the foldable nylon magnetic sensor assembly 270. Before the residual magnetism measurement, the foldable nylon magnetic sensor assembly 270 needs to be connected to an external residual magnetism testing device known in the art, where the residual magnetism testing device includes, but is not limited to, a computer or single-chip microcomputer connected to the nylon magnetic sensor 273 and a display screen connected thereto. In the residual magnetism testing method, in order to improve the measurement accuracy, before measuring the residual magnetism of the object to be tested 280 on the rack 250, the height of the test table 230 and the track 240 thereon, the rack 250, and the object to be tested 280 are adjusted by adjusting the height of the lifting mechanism 220 so that the object to be tested 280 enters the recognition area of ​​the nylon magnetic sensor 273 of the foldable nylon magnetic sensor assembly 270.

[0026] Please refer to Figures 3 and 4 、 Figures 8 and 9The embodiment of the present invention further provides a method for using a zero-magnetic shielding device, and also includes a method for demagnetizing the zero-magnetic shielding device. The method for demagnetizing the zero-magnetic shielding device includes: The innermost Permalloy cylinder of the shielding cylinder 110 is demagnetized by means of a demagnetizing coil 115 wound on the outer wall of the innermost Permalloy cylinder. That is, the background magnetic field is eliminated. The demagnetizing coil 115 needs to be connected to a demagnetizing machine, and the demagnetizing machine controls the demagnetizing coil 115 to generate an alternating magnetic field attenuation or repeatedly applies a positive and negative magnetic field (and reduces the amplitude) to achieve the purpose of demagnetizing the shielding cylinder 110. The demagnetizing machine can adopt any known technology in the field. In order to improve the measurement accuracy, before the magnetic flux or residual magnetism test of the object to be measured 280 is performed, the innermost Permalloy cylinder of the shielding cylinder 110 is demagnetized. The demagnetizing coil 115 can be optionally equipped with a cross-sectional area of ​​2.5mm 2 The copper enameled wire is wound into a plurality of turns of coil according to the length of the inner cylinder 111 , and the degaussing coil 115 can be led out from the reserved through hole of the magnetic shielding cylinder 100 .

[0027] The zero magnetic shielding device and its use method provided in the embodiment of the present invention are as follows: when performing a magnetic flux test of an object to be tested 280 in a magnetic shielding cylinder 100, the shielding cover 120 is removed, the object to be tested 280 is placed in the Helmholtz coil 260, and the rack 250 and the Helmholtz coil 260 thereon and the object to be tested 280 therein are slid along the track 240 to a predetermined area of ​​the shielding cylinder 110, so that the magnetic flux of the object to be tested 280 is measured by the Helmholtz coil 260 when the magnetic shielding cylinder 100 is in an open state; when performing a residual magnetism test, the Helmholtz coil 260 on the rack 250 is removed, and the object to be tested 280 is placed on the rack. 250, by controlling the foldable nylon magnetic sensor assembly 270 to be in the unfolded state, the object 280 to be tested on the storage rack 250 is slid along the track 240 to the detection area of ​​the foldable nylon magnetic sensor assembly 270, so that when the closed magnetic shielding tube 100 is in the closed state, the residual magnetism of the object 280 to be tested is measured by the foldable nylon magnetic sensor assembly 270, so that when the magnetic flux and residual magnetism switching test is performed on the object 280 to be tested in the magnetic shielding tube 100, there is no need to replace the non-magnetic multifunctional test frame 200, thereby improving the efficiency of the magnetic flux and residual magnetism switching test of the object 280 to be tested in the magnetic shielding tube 100, and having the advantage of convenient switching test.

[0028] The zero magnetic shielding device and its use method provided by the embodiment of the present invention, the non-magnetic multifunctional test frame 200 installed in the magnetic shielding tube 100 is suitable for testing the magnetic flux and residual magnetism of the object 280 to be tested, without switching, and has universality, avoiding the tedious process of repeatedly positioning and installing different test frames in the magnetic shielding tube 100 when performing magnetic flux and residual magnetism switching tests in the traditional magnetic shielding tube 100, thereby improving the switching test efficiency of magnetic flux and residual magnetism.

[0029] The zero-magnetic shielding device and its use method provided by the embodiment of the present invention are as follows: the non-magnetic multifunctional test frame 200 can adjust the height through the lifting mechanism 220 in the magnetic shielding tube 100. On the one hand, the object to be tested 280 can enter the detection area of ​​the residual magnetism test, thereby improving the residual magnetism measurement accuracy of the object to be tested 280; on the other hand, it is suitable for magnetic shielding tubes 100 of different diameters and has the advantage of a wide range of applications.

[0030] In the zero-magnetic shielding device and its use method provided by the embodiment of the present invention, the arc seat 210 of the non-magnetic multifunctional test frame 200 is arc-shaped, which improves the stability of the non-magnetic multifunctional test frame 200 when installed as a whole in the magnetic shielding tube 100.

[0031] The zero-magnetic shielding device and its use method provided by the embodiment of the present invention are as follows: the rack 250 of the non-magnetic multifunctional test frame 200 can slide along the track 240, and the object to be tested 280 carried by the rack 250 can be slid into the test area within the magnetic shielding tube 100 through the rack 250 for corresponding measurement, thereby improving the measurement accuracy.

[0032] The zero-magnetic shielding device and its use method provided by the embodiments of the present invention, when performing a magnetic flux test on an object 280 to be tested, controls the foldable nylon magnetic sensor assembly 270 to be in a folded state, thereby retracting the foldable nylon magnetic sensor assembly 270 onto the arc-shaped seat 210, thereby preventing the foldable nylon magnetic sensor assembly 270 from interfering with and having other adverse effects on the magnetic flux measurement of the object 280 to be tested. When performing a residual magnetism test on the object 280 to be tested, controls the foldable nylon magnetic sensor assembly 270 to be in an unfolded state, thereby pushing the object 280 to be tested into the detection area of ​​the foldable nylon magnetic sensor assembly 270 to perform a residual magnetism measurement. During the residual magnetism test, the Helmholtz coil 260 is removed to prevent it from interfering with the residual magnetism test of the object 280 to be tested.

[0033] Please refer to Figures 6 and 7 The zero magnetic shielding device and the method of using the same provided by the embodiment of the present invention may further include: The bracket 300 includes a movable frame 310 and a tube frame 320 connected thereto, and the magnetic shielding tube 100 is detachably connected to the tube frame 320. When the magnetic shielding tube 100 is connected to the bracket 300, the magnetic shielding tube 100 is moved to the test environment by controlling the movement of the movable frame 310, which facilitates the transportation of the magnetic shielding tube 100. The tube frame 320 can improve the reliability of the connection to the magnetic shielding tube 100. The corresponding tube frame 320 is provided with an arc groove that matches the magnetic shielding tube 100. The tube frame 320 can be connected to the extension piece or ear plate on the magnetic shielding tube 100 by bolts through the through hole or threaded hole thereon. The bracket 300 can also support the load of the magnetic shielding tube 100. In order to reduce costs, the tube frame 320 can be a grid structure or a hollow structure.

[0034] The present invention is not limited to the specific embodiments described above. Obviously, the embodiments described above are only some embodiments of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention described, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. In this way, if these modifications and changes of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these changes and changes.

Claims

1. A zero magnetic shielding device, characterized in that: include: A magnetic shielding cylinder, comprising a shielding cylinder body and a detachably connected shielding cover; A non-magnetic multifunctional test frame is installed in the magnetic shielding cylinder and includes an arc-shaped seat installed in the magnetic shielding cylinder, a test table located above the arc-shaped seat in a horizontal plane, a lifting mechanism hinged between the arc-shaped seat and the test table, a track provided on the test table along its length, a storage rack slidably provided on the track, and a Helmholtz coil placed on the storage rack for measuring the magnetic flux of an object to be tested placed in the Helmholtz coil; the frame also includes a foldable nylon magnetic sensor assembly provided on the arc-shaped seat, which, when in an unfolded state, passes through an opening reserved in the test table and is located above the storage rack for measuring the residual magnetism of an object to be tested placed on the storage rack; when performing a magnetic flux test, the foldable nylon magnetic sensor assembly is retracted from the opening reserved in the test table and returned to the arc-shaped seat when in a folded state.

2. The zero-magnetic shielding device according to claim 1, characterized in that: The shielding cylinder includes an inner cylinder and an outer cylinder. The inner cylinder is composed of five layers of permalloy cylinders. A demagnetization coil is wound on the outer wall of the innermost permalloy cylinder. Both ends of the demagnetization coil extend outside the shielding cylinder for connection to the demagnetizer. The outer cylinder is an aluminum cylinder. Adjacent layers of the cylinder are isolated by foam filling. The shielding cover includes an embedded shielding inner cover and a protective outer cover. The shielding inner cover is a two-layer embedded permalloy cover. The protective outer cover is an aluminum cover. Two handles are symmetrically provided on the protective outer cover. Adjacent layers of the cover are isolated by foam filling. The protective outer cover is hermetically installed on the outer cylinder. The shielding inner cover is sealed in the cavity between any three layers of permalloy cylinders between the innermost layer and the outermost layer of the inner cylinder. A sealing ring is arranged around the cavity between any two adjacent layers of permalloy cylinders at one end of the inner cylinder where the shielding inner cover is installed.

3. The zero-magnetic shielding device according to claim 1, characterized in that: The lifting mechanism is a scissor-type lifting frame, and a handle is provided on the test table for controlling the scissor-type lifting frame to rise and fall relative to the arc-shaped seat by pulling the test table.

4. The zero-magnetic shielding device according to claim 1, characterized in that: The foldable nylon magnetic sensor assembly includes a support fixed on an arc-shaped seat, an adjusting rod hinged on the support, a nylon magnetic sensor connected to the upper end of the adjusting rod, a pull rod hinged on the adjusting rod close to the support, and one end of the pull rod extending from the arc-shaped seat is connected to a handle; when the pull rod is pulled outward by the handle, the adjusting rod and the nylon magnetic sensor connected thereto flip to a horizontal state, and when the pull rod is pushed inward by the handle, the adjusting rod and the nylon magnetic sensor connected thereto flip to a vertical state.

5. The zero-magnetic shielding device according to claim 1, characterized in that: Also includes: The bracket comprises a movable frame body and a cylinder frame connected thereto, and the magnetic shielding cylinder is detachably connected to the cylinder frame.

6. A method for using the zero magnetic shielding device according to any one of claims 1 to 5, characterized in that: Including magnetic flux test method and residual magnetism test method, The magnetic flux testing method comprises: Open the shielding cover installed on the shielding cylinder of the magnetic shielding cylinder to put the magnetic shielding cylinder in an open state, place the Helmholtz coil on the storage rack, place the object to be measured in the Helmholtz coil, slide the storage rack, the Helmholtz coil on it, and the object to be measured in it along the track to a predetermined area of ​​the shielding cylinder, and measure the magnetic flux of the object to be measured through the Helmholtz coil; The residual magnetism testing method comprises: Open the shielding cover installed on the shielding cylinder of the magnetic shielding cylinder, take out the Helmholtz coil on the rack, place the object to be measured on the rack, control the folding nylon magnetic sensor assembly to be in the unfolded state, slide the rack and the object to be measured on it along the track to the detection area of ​​the folding nylon magnetic sensor assembly, close and install the shielding cover, so that the magnetic shielding cylinder is in the closed state, and measure the residual magnetism of the object to be measured on the rack through the folding nylon magnetic sensor assembly.

7. A method for using the zero-magnetic shielding device according to claim 2, characterized in that: Including zero magnetic shielding device demagnetization method, magnetic flux testing method and residual magnetism testing method, The zero-magnetic shielding device demagnetization method comprises: The innermost permalloy cylinder of the shielding cylinder is demagnetized by turning on the power supply through the demagnetization coil wound on the outer wall of the innermost permalloy cylinder; The magnetic flux testing method comprises: Open the shielding cover installed on the shielding cylinder of the magnetic shielding cylinder to put the magnetic shielding cylinder in an open state, place the Helmholtz coil on the storage rack, place the object to be measured in the Helmholtz coil, slide the storage rack, the Helmholtz coil on it, and the object to be measured in it along the track to a predetermined area of ​​the shielding cylinder, and measure the magnetic flux of the object to be measured through the Helmholtz coil; The residual magnetism testing method comprises: Open the shielding cover installed on the shielding cylinder of the magnetic shielding cylinder, take out the Helmholtz coil on the rack, place the object to be measured on the rack, control the folding nylon magnetic sensor assembly to be in the unfolded state, slide the rack and the object to be measured on it along the track to the detection area of ​​the folding nylon magnetic sensor assembly, close and install the shielding cover, so that the magnetic shielding cylinder is in the closed state, and measure the residual magnetism of the object to be measured on the rack through the folding nylon magnetic sensor assembly.

8. The method for using the zero-magnetic shielding device according to claim 7, characterized in that: Before performing magnetic flux or residual magnetism testing on the object to be tested, the innermost Permalloy cylinder of the shielding cylinder is demagnetized.

9. The method for using the zero-magnetic shielding device according to claim 7, characterized in that: In the residual magnetism testing method, before measuring the residual magnetism of the object to be tested on the rack, the height of the test table and the track thereon, the rack, and the object to be tested are adjusted by adjusting the height of the lifting mechanism so that the object to be tested enters the recognition area of ​​the nylon magnetic sensor of the foldable nylon magnetic sensor assembly.

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