CN111044955B - Automatic self-centering magnetic shielding device capable of opening and closing - Google Patents
Automatic self-centering magnetic shielding device capable of opening and closing Download PDFInfo
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- CN111044955B CN111044955B CN201911369484.6A CN201911369484A CN111044955B CN 111044955 B CN111044955 B CN 111044955B CN 201911369484 A CN201911369484 A CN 201911369484A CN 111044955 B CN111044955 B CN 111044955B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/10—Plotting field distribution ; Measuring field distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0047—Housings or packaging of magnetic sensors ; Holders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/007—Environmental aspects, e.g. temperature variations, radiation, stray fields
- G01R33/0076—Protection, e.g. with housings against stray fields
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Abstract
The invention discloses an automatic opening and closing self-centering magnetic shielding device which specifically comprises a pneumatic driving unit, a self-centering cover body unit and a magnetic shielding cavity, wherein the pneumatic driving unit is connected with the self-centering cover body unit and drives the self-centering cover body unit to rotate so as to realize automatic opening or closing of the magnetic shielding device; the self-centering cover body unit comprises a cover body, a driving force arm and horizontal and vertical adjusting mechanisms arranged on the cover body, wherein one end of the driving force arm is connected with the pneumatic driving unit, and the other end of the driving force arm is rotatably connected with the cover body, so that the cover body rotates around the driving force arm; the freedom degrees of the cover body in the vertical and horizontal directions are realized through the horizontal and vertical adjusting mechanisms; the cover body and the magnetic shielding cavity are covered and arranged at an inward guiding oblique angle, and self-centering of the self-centering cover body unit and the magnetic shielding cavity is achieved through the guiding oblique angle, the rotational freedom degree, the horizontal freedom degree and the vertical freedom degree. The invention has compact structure, convenient control and good magnetic shielding effect.
Description
Technical Field
The invention relates to the field of magnetic shielding, in particular to an automatic opening and closing self-centering magnetic shielding device.
Background
An optical pumping magnetometer based on the principle of spin-free exchange relaxation (SERF) is a quantum sensor with ultrahigh magnetic field measurement sensitivity. The magnetic measurement sensitivity of the sensor is extremely high (fT magnitude) and the measurement range is relatively small, so that the test environment needs to be ensured in a near-zero magnetic environment which is not interfered by an external magnetic field, the magnetic shielding device is also produced under the requirement, and the requirements on the material, the process and the assembly of the magnetic shielding device are high in order to ensure the high performance of the magnetic shielding device.
The magnetic shielding device for general test research has higher matching requirement for ensuring the service performance, and the test probe in the magnetic shielding device is replaced and adjusted basically in the using process by manually disassembling and assembling the magnetic shielding cover. This introduces some problems: firstly, it causes inconvenience for researchers to operate the shielding device (a layer of aluminum alloy cover and 4 layers of high-conductivity magnetic material covers are required to be installed from outside to inside in total); secondly, assembly stress is introduced in the manual disassembly and assembly process, so that the magnetic performance of the high-permeability material is changed, and the magnetic shielding performance of the magnetic shielding device is influenced (the magnetic shielding device is generally of a columnar structure, and the axial direction is the weakest direction of the magnetic shielding); thirdly, the demagnetizing wire needs to be hidden in the magnetic shielding device in the normal use process, so that the demagnetizing wire needs to be pulled out of the device to be connected externally for demagnetizing every time, and the operation is complicated; fourthly, artificial operation factors must be introduced in the testing process, the influence of testees is high, and the test repeatability is poor.
From the related field of weak magnetic research, the magnetic shielding devices for research are not realized in an automatic mode, and the following aspects are mainly difficult: firstly, additional electromagnetic noise can be introduced into the automatic equipment, so that the external environment of the magnetic shielding device is deteriorated; secondly, in order to ensure the magnetic shielding effect, the magnetic shielding cover is generally made of four layers of high-permeability materials, so that the design difficulty of the switch cover can be increased; thirdly, in order to ensure the magnetic shielding performance, the tolerance matching requirement of the cover and the main body is higher, and the matching clearance is difficult to ensure after the cover and the main body are made to be automatic.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the automatic opening and closing self-centering magnetic shielding device, which realizes automatic opening of the cover, and has the advantages of simple structure, good magnetic shielding performance and strong operability.
The purpose of the invention is realized by the following technical scheme:
a self-centering magnetic shielding device capable of automatically opening and closing comprises a pneumatic driving unit, a self-centering cover body unit and a magnetic shielding cavity, wherein the pneumatic driving unit is connected with the self-centering cover body unit and drives the self-centering cover body unit to rotate so as to realize automatic opening or closing of the magnetic shielding device;
the self-centering cover body unit comprises a cover body, a driving force arm, a horizontal adjusting mechanism and a vertical adjusting mechanism, wherein the horizontal adjusting mechanism and the vertical adjusting mechanism are arranged on the cover body; the freedom degrees of the cover body in the vertical and horizontal directions are realized through the horizontal adjusting mechanism and the vertical adjusting mechanism; the cover body and the magnetic shielding cavity are covered by an inward guide oblique angle, and the self-centering cover body unit and the magnetic shielding cavity are self-centered through the guide oblique angle, the rotational freedom degree, the horizontal freedom degree and the vertical freedom degree.
Furthermore, the self-centering cover body unit specifically comprises a cover body, a driving force arm, an adjusting flange and an adjusting rotating shaft, wherein the adjusting flange is fixedly connected to the cover body and is rotatably connected with the driving force arm through the adjusting rotating shaft, a waist-shaped hole is formed in the adjusting flange, and the adjusting rotating shaft can slide left and right in the waist-shaped hole to form the horizontal adjusting mechanism; a gap is arranged between an adjusting flange connected to the adjusting rotating shaft and the driving force arm in the vertical direction, so that a vertical adjusting mechanism is formed.
Furthermore, the cover body comprises an aluminum alloy cover arranged on the outermost layer and a plurality of layers of high-conductivity magnetic material covers arranged inside the aluminum alloy cover, the guide oblique angle is arranged at the end part of the aluminum alloy cover, the cover body is of a central symmetrical structure, and the aluminum alloy cover and the plurality of layers of high-conductivity magnetic material covers are fixedly connected through a non-magnetic bolt arranged at the center of the cover body; the number of layers of the shielding cavity in the magnetic shielding cavity is the same as that of the high-permeability material cover on the cover body, and one-to-one correspondence is realized.
Further, the distribution and adjustment of the axial gap among the plurality of layers of high-conductivity magnetic material covers are completed by the following formula:
wherein: sAiAnd Li is the axial shielding coefficient of the ith layer, and the length of the ith shielding layer.
Further, the cover body is further provided with two notches, and the arrangement mode of the demagnetizing wires in the magnetic shielding cavity is as follows: the demagnetizing wire is wound between the innermost magnetic shielding cavity and the outermost magnetic shielding cavity according to the same rotation direction, 6 groups of demagnetizing coil windings are wound from the inner layer to the outer layer in total, the demagnetizing coil windings are uniformly distributed along the circumferential direction of the cavity, currents in the same direction are connected in series between the groups, the groups are respectively connected in series from one notch nearby, positive and negative terminals of the coil are led out from one notch, demagnetizing control currents are applied, and the purpose of demagnetizing is achieved.
Furthermore, a limiting stop block is arranged at the contact part of the driving force arm and the cover body, so that the rotation angle of the cover body (2) around the adjusting rotating shaft is always in a guiding adjusting range.
Furthermore, the pneumatic driving unit comprises a support frame, a non-magnetic cylinder, a control screen and a piston rod, wherein the support frame is used for supporting the pneumatic driving unit, the non-magnetic cylinder is fixed on the support frame, the piston rod is rotatably connected with the driving force arm, and the control screen is also fixed on the support frame and used for controlling the pneumatic driving unit.
Furthermore, the pneumatic driving unit comprises a control unit, the control unit comprises a motor, an air pump, a filtering/drying device, an air inlet gate valve and a middle-sealed three-position five-way electromagnetic valve which are sequentially connected, the middle-sealed three-position five-way electromagnetic valve is connected with the nonmagnetic cylinder, the motor drives the air pump to provide a pressure air source, and air is introduced into the middle-sealed three-position five-way electromagnetic valve through the filtering/drying device and the air inlet gate valve in sequence, so that the forward and reverse movement of the nonmagnetic cylinder is controlled;
the control unit further comprises a speed regulating throttle valve and an air bleeding throttle valve which are connected in series and then connected in parallel to two ends of the middle-sealed three-position five-way electromagnetic valve, so that the pushing speed of the non-magnetic cylinder is regulated and the non-magnetic cylinder is opened under abnormal conditions.
Furthermore, the control unit also comprises a pressure sensor arranged at the end part of the piston rod of the nonmagnetic cylinder and used for monitoring and feeding back an abnormal pressure signal in real time.
Furthermore, the high-conductivity magnetic material cover in the aluminum alloy cover is four layers.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts pneumatic drive, and the control unit can be arranged far away from the magnetic shielding device, thereby reducing the electromagnetic influence of the control unit on the magnetic shielding cavity to the minimum;
2. the magnetic shielding cover can automatically align the circle center in the opening and closing processes, and the shielding cover is in a free state in the covering and closing process, so that self-centering is realized, and the shielding cover is prevented from rotating to the outside of an adjustable margin relative to the driving force arm by arranging the limiting mechanism;
3. the magnetic shielding cover of the invention is an integral body formed by the outer layer and the inner layer, the original matching of the single-layer cover and the single-layer cavity body is changed into integral matching, and the magnetic shielding performance is adjusted to the best state by means of distributing tolerance and clearance.
4. The invention ensures that the degaussing becomes more convenient and faster through the reasonable arrangement of the degaussing wires, and the interference does not occur in the opening and closing process of the cover, so that the degaussing becomes more convenient and faster, and the operation convenience of a user is improved.
5. The magnetic shielding device has compact structure and convenient operation, reduces the influence of human factors in the test process and the influence on the magnetic shielding performance of the cover body in the assembly process, and can completely shield additional electromagnetic interference.
Drawings
FIG. 1 is a perspective view of the overall structure of the present invention;
FIG. 2 is a right side view of the present invention;
FIG. 3 is a schematic view of the gas circuit of the present invention;
fig. 4 is a schematic view of the structure of the magnetic shield cover self-centering device of the present invention;
FIG. 5 is a partially cut away schematic view of the magnetic shield and cover of the present invention;
fig. 6 is a schematic view of a degaussing wire arrangement of the present invention;
FIG. 7 is a simulation diagram of the present invention under different cover gaps.
In the figure: 1. a base; 2. a cover body; 3. a bolt; 4. adjusting the flange; 5. a drive arm; 6. adjusting the rotating shaft; 7, an aluminum alloy cavity; 8. a support frame; 9. a non-magnetic cylinder; 10. a control screen; 11. a rotating base; 12. an interface board; 13. an interface ear mount; 14. a moment arm rotating shaft; 15. a toggle joint; 16. a pressure sensor; 17. locking the first nut; 18. a piston rod; 19. a gas path interface; 20. a cylinder base; 21. a stopper block; 22. a notch; 23. a first high magnetic conductive cover; 24. a second high magnetic conductive cover; 25. a high magnetic conductivity cover III; 26. a high magnetic conductivity cover IV; 27. locking a second nut; 28. a support pad; 29. the outermost high magnetic conduction cavity; 30. a high permeability magnetic cavity of the innermost layer; i, an air pump; II, a filter/dryer; III, a gate valve; IV, regulating a speed throttle valve; v, a three-position five-way electromagnetic valve; VI, an air discharge throttle valve; VII, a cylinder; VIII, and a pressure relief opening (communicated with the atmosphere).
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the objects and effects of the invention will become more apparent. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 5, the automatic opening and closing self-centering magnetic shielding device of the present invention includes a pneumatic driving unit, a self-centering cover unit, a magnetic shielding cavity 7, and a base 1, wherein the pneumatic driving unit and the magnetic shielding cavity 7 are fixed on the base 1, and the pneumatic driving unit is connected to the self-centering cover unit to drive the self-centering cover unit to rotate, so as to realize automatic opening or closing of the magnetic shielding device.
The pneumatic driving unit comprises a supporting frame 8, a non-magnetic cylinder 9, a control screen 10, a piston rod 18, a cylinder base 20, a pressure sensor 16, a first locking nut 17 and an elbow joint 15, wherein the supporting frame 8 is fixed on the base 1 and used for supporting the pneumatic driving unit, the non-magnetic cylinder 9 is fixed on the supporting frame 8 through the cylinder base 20, and the piston rod 18 is connected with an interface board 12 at the tail end of the driving arm 5 and an interface lug seat through the elbow joint 15. A pressure sensor 16 is arranged between a piston rod 18 and the elbow joint 15 and used for feeding back an abnormal pressure signal (the sensor 16 is fixedly connected with the elbow joint 15 and is in threaded connection with the piston rod 18), the rear end of the piston rod is locked by a locking nut I17 (the sensor 16, the locking nut I17 and the piston rod 18 are in threaded connection to form a double-nut structure), and the acting length of the piston rod can be adjusted within a certain range by adjusting the elbow joint 15 and the locking nut I17.
The pneumatic driving unit also comprises a control unit, namely an air source part, as shown in fig. 3, and comprises a motor, an air pump I, a filtering/drying device II, an air inlet gate valve III, a middle-sealed three-position five-way electromagnetic valve V and a corresponding control circuit which are sequentially connected, wherein the middle-sealed three-position five-way electromagnetic valve V is connected with an air path interface of the non-magnetic cylinder 9, the motor drives the air pump I to provide a pressure air source, and air is introduced into the middle-sealed three-position five-way electromagnetic valve V through the filtering/drying device II and the air inlet gate valve III to further control the non-magnetic cylinder 9 to move forwards and backwards;
the control unit further comprises a speed regulation throttle valve IV and an air discharge throttle valve VI, the speed regulation throttle valve IV and the air discharge throttle valve VI are connected in series and then connected to two ends of the middle-sealed three-position five-way electromagnetic valve V in parallel, the speed regulation throttle valve IV is used for regulating the pushing speed of the air cylinder, and the air discharge throttle valve VI is used under abnormal conditions, so that safe and reliable operation of an air path is guaranteed.
For convenient operation, the control panel 10 is adopted to carry out relevant control on the cylinder electromagnetic valve V, meanwhile, an emergency stop button and a reset switch are additionally arranged to deal with emergency, and all circuit elements relevant to electromagnetism are independently placed in the control cabinet and are subjected to shielding treatment. The pressure sensor 16 is an additional safety feedback device, and when the pressure abnormally rises, the solenoid valve controls the cylinder to automatically stop working and restore the reset state (the reset state defaults to the state that the cylinder is opened). The control screen 10 is used for opening and closing the device in two control modes, and the automatic mode or the manual mode can be switched at will according to the situation of a user. The switch board provides the external interface, can realize integrated control.
As shown in fig. 4, the self-centering cover unit specifically includes a cover body 2, a driving arm 5, an adjusting flange 4, an adjusting rotating shaft 6, a force arm rotating shaft 14, an interface board 12, and an interface ear seat 13. The interface board 12 is fixed on the driving force arm 5, and the interface ear base 13 is fixed on the interface board 12. The piston rod 18 is hinged with the interface ear seat 13 through the fixedly connected sensor 16 and the elbow joint 15, so as to drive the power arm 5 to move. Under the drive of the piston rod 18, the driving force arm 5 can rotate around the force arm rotating shaft 14, so as to drive the self-centering cover body to open and close.
The adjusting flange 4 is fixedly connected on the cover body 2 and is rotatably connected with the driving force arm 5 through an adjusting rotating shaft 6.
In order to achieve self-centering of the cap body 2, it is necessary to ensure a sufficient degree of freedom of the cap body 2 with respect to the driving force arm 5. Therefore, the adjusting flange 4 is internally provided with a waist-shaped hole, and the adjusting rotating shaft 6 can slide left and right in the waist-shaped hole to form a horizontal adjusting mechanism; and a gap is arranged between the adjusting flange 4 connected to the adjusting rotating shaft 6 and the driving force arm 5 in the vertical direction, so that a vertical adjusting mechanism is formed. Meanwhile, as shown in fig. 5, an inward guide bevel is provided at a position where the cover body 2 is covered with the magnetic shield cavity.
In the covering process, the cover body 2 can freely move up and down and left and right in a certain range relative to the driving force arm 5, can rotate around the adjusting rotating shaft 6, and can complete automatic centering action along with the guiding of the guiding oblique angle.
In addition, a limit stopper 21 is mounted on the driving force arm 5 so that the angle of rotation is always within the guide adjustment range.
As one embodiment, as shown in fig. 5, the lid body 2 has a central symmetric structure, and is composed of four inner layers of high magnetic conductive material lids 23, 24, 25, and 26 and one outer layer of aluminum alloy lid 2, which are connected to each other through a non-magnetic bolt 3, a double-locking nut b27, and a support pad 28 to form an integral structure, and the axial gap distribution and adjustment among the high magnetic conductive material lids 23, 24, 25, and 26 is accomplished through the following formulas:
wherein: sAiIs the i-th layer axial shielding coefficient, LiIs the ith shield length.
After the dimensions are confirmed, the magnetic field distribution in the magnetic shielding cavity is checked according to the following formula, and the design of the end cover hole is checked:
wherein:
Hextan axial external magnetic field (away from the shielding);
x-axial distance from the center of the shield;
b-innermost radius;
r is the diameter of the central hole of the magnetic shielding cover;
in order to ensure that the 5-layer cover and the 5-layer cavity are smoothly covered, the clearance is strictly designed and controlled, and relevant calculation is carried out in a finite element mode. In actual finite element simulation calculation and test, the influence of the radial clearance on the magnetic shielding effect is not large in the axial magnetic shielding clearance, the radial dimension tolerance is relaxed in the design, the control requirement is tightened on the axial clearance of each layer (the axial clearance is given by 0-0.2 mm), the magnetic shielding effect of a test sample piece is good, the whole assembly is easily completed, and the influence of different axial clearances on the uniform area and the magnetic shielding effect is shown in figure 7 (the figure 7a is a 0mm clearance, and the figure 7b is a 0.5mm clearance).
The traditional demagnetizing wire arrangement form needs to take out the demagnetizing coil from the magnetic shielding cavity body when demagnetizing every time, and the demagnetizing coil is connected with the connecting wire in series independently, so that the operation is complex, and a novel demagnetizing wire arrangement form is adopted for realizing the automatic integrated test with less human factor intervention. The degaussing coil windings are wound in the same rotation direction between the innermost magnetic shielding cavity 30 and the outermost magnetic shielding cavity 29 according to the form of figure 6, 6 groups in total are wound from the inner layer to the outer layer, the degaussing coil windings are uniformly distributed along the circumferential direction of the cavity (two groups of coils are shown for simplifying images), currents in the same direction are connected in series between the groups, series connection wires are led out from two notches 22 nearby respectively, interference in the covering process is avoided, positive and negative terminals of the coils are led out from one notch, degaussing control currents are applied, and the purpose of degaussing is achieved.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The automatic opening and closing self-centering magnetic shielding device is characterized by comprising a pneumatic driving unit, a self-centering cover body unit and a magnetic shielding cavity (7), wherein the pneumatic driving unit is connected with the self-centering cover body unit and drives the self-centering cover body unit to rotate so as to realize automatic opening or closing of the magnetic shielding device;
the self-centering cover body unit comprises a cover body (2), a driving force arm (5), and a horizontal adjusting mechanism and a vertical adjusting mechanism which are arranged on the cover body (2), wherein one end of the driving force arm (5) is connected with the pneumatic driving unit, and the other end of the driving force arm is rotatably connected with the cover body (2), so that the rotational freedom degree of the cover body (2) around the driving force arm (5) is realized; the freedom degree of the cover body (2) in vertical and horizontal directions is realized through the horizontal adjusting mechanism and the vertical adjusting mechanism; an inward guiding oblique angle is arranged at the covering position of the cover body (2) and the magnetic shielding cavity, and the self-centering of the self-centering cover body unit and the magnetic shielding cavity (7) is realized through the guiding oblique angle, the rotational freedom degree, the horizontal freedom degree and the vertical freedom degree;
the cover body (2) comprises an aluminum alloy cover arranged on the outermost layer and a plurality of layers of high-conductivity magnetic material covers (23, 24, 25 and 26) arranged inside the aluminum alloy cover, the guide oblique angle is arranged at the end part of the aluminum alloy cover, the cover body (2) is of a central symmetrical structure, and the aluminum alloy cover and the plurality of layers of high-conductivity magnetic material covers (23, 24, 25 and 26) are fixedly connected through a non-magnetic bolt (3) arranged at the center of the cover body (2); the number of layers of the shielding cavity in the magnetic shielding cavity (7) is the same as that of the high-conductivity magnetic material cover on the cover body (2), so that one-to-one correspondence is realized;
the distribution and adjustment of the axial clearance among the plurality of layers of high-conductivity magnetic material covers (23, 24, 25, 26) are completed by the following formula:
wherein:
is the axial shielding factor of the ith layer,
is the ith shield length.
2. The self-centering magnetic shielding device capable of automatically opening and closing according to claim 1, wherein the self-centering cover unit specifically comprises a cover body (2), a driving arm (5), an adjusting flange (4) and an adjusting rotating shaft (6), wherein the adjusting flange (4) is fixedly connected to the cover body (2) and rotatably connected with the driving arm (5) through the adjusting rotating shaft (6), a kidney-shaped hole is formed in the adjusting flange (4), and the adjusting rotating shaft (6) can slide left and right in the kidney-shaped hole to form the horizontal adjusting mechanism; and a gap is arranged between the adjusting flange (4) connected to the adjusting rotating shaft (6) and the driving force arm (5) in the vertical direction to form a vertical adjusting mechanism.
3. The automatic opening and closing self-centering magnetic shield device according to claim 1, wherein the cover body (2) is further provided with two notches (22), and the arrangement mode of the demagnetizing wires inside the magnetic shield cavity (7) is as follows: the demagnetizing wire is wound with demagnetizing coil windings in the same rotation direction between the innermost magnetic shielding cavity and the outermost magnetic shielding cavity, 6 groups in total are wound from the inner layer to the outer layer, the demagnetizing coil windings are uniformly distributed along the circumferential direction of the cavity, currents in the same direction between the groups are connected in series, the series connection wires are respectively led out from one notch (22) nearby, the positive and negative terminals of the coil are led out from the other notch, demagnetizing control currents are applied, and the purpose of demagnetizing is achieved.
4. Self-centering magnetic shield device, according to claim 2, characterized in that a limit stop (21) is further provided where said driving arm (5) contacts said cover body (2), so that the rotation angle of said cover body (2) around said adjusting spindle (6) is always within the guiding adjustment range.
5. The automatic opening and closing self-centering magnetic shielding device according to claim 1, wherein the pneumatic driving unit comprises a supporting frame (8), a non-magnetic cylinder (9), a control panel (10) and a piston rod (18), the supporting frame (8) is used for supporting the pneumatic driving unit, the non-magnetic cylinder (9) is fixed on the supporting frame (8), the piston rod (18) is rotatably connected with the driving arm (5), and the control panel (10) is also fixed on the supporting frame (8) and is used for controlling the pneumatic driving unit.
6. The automatic opening and closing self-centering magnetic shielding device according to claim 5, wherein the pneumatic driving unit comprises a control unit, the control unit comprises a motor, an air pump (I), a filtering/drying device (II), an air inlet gate valve (III) and a middle-sealing type three-position five-way electromagnetic valve (V) which are sequentially connected, the middle-sealing type three-position five-way electromagnetic valve (V) is connected with the non-magnetic cylinder (9), the motor drives the air pump (I) to provide a pressure air source, and air is introduced into the middle-sealing type three-position five-way electromagnetic valve (V) through the filtering/drying device (II) and the air inlet gate valve (III) in sequence, so that the forward and reverse movement of the non-magnetic cylinder (9) is controlled;
the control unit further comprises a speed regulation throttle valve (IV) and an air discharge throttle Valve (VI), wherein the speed regulation throttle valve (IV) and the air discharge throttle Valve (VI) are connected in series and then connected in parallel at two ends of the middle seal type three-position five-way electromagnetic valve (V), so that the pushing speed of the non-magnetic cylinder (9) is regulated and the non-magnetic cylinder is opened under the abnormal condition.
7. The self-centering magnetic shield device capable of automatically opening and closing according to claim 6, characterized in that said control unit further comprises a pressure sensor (16) arranged at the end of the piston rod (18) of said nonmagnetic cylinder (9) for monitoring the feedback abnormal pressure signal in real time.
8. Self-centering magnetic shield, automatically opening and closing, according to claim 1, characterized in that said cover of highly conductive magnetic material (23, 24, 25, 26) inside said aluminum alloy cover is four-layered.
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