Large square magnetic shielding house capable of generating uniform magnetic field

Abstract

The utility model relates to a large-scale square magnetic shielding room capable of generating a uniform magnetic field in the field of special buildings, which is convenient for wiring of an electromagnetic coil on the outer side of an inner shell through a wiring cavity arranged between the outer shell and the inner shell; meanwhile, through the linear motion assembly and the circular motion assembly, the movable block spirally moves on the outer side of the shell and is matched with the winding roller and the movable ring, and winding of the cable on the winding roller is achieved; in addition, through cooperation of the winding assembly and the fixing ring, the cable is kept in a tensioning state when the electromagnetic coil is wound, and the wiring quality is improved; in addition, the number of turns of the electromagnetic coil to be wound and the cable distribution density can be accurately controlled conveniently by controlling the motor rotating speeds of the linear motion assembly, the circular motion assembly and the winding assembly, and good practicability and adaptability are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a square magnetic shielding house, especially a large square magnetic shielding house capable of generating uniform magnetic field applied to the field of special building. BACKGROUND

[0002] The magnetic shielding house is a technical device for blocking the propagation of magnetic field by using specific materials or structures. The structure is usually composed of a hexahedral room made of metal plates (such as steel or alloy), which has the function of absorbing and reflecting magnetic field. In order to enhance the diversity of test scenarios, electromagnetic coils are usually equipped in the magnetic shielding house. These coils can generate specific magnetic field environment by loading current. However, the number of turns and the distribution density of the cables of the electromagnetic coils in the magnetic shielding house are fixed at the time of construction. If these parameters need to be adjusted to meet different test requirements, the original electromagnetic coils have to be disassembled and new coils have to be installed, which is not only complicated but also time-consuming.

[0003] The patent with publication number CN206110731U discloses a shielding room for shielding the imaging equipment to prevent it from being disturbed by external electromagnetic signals and to ensure its stability and accuracy. The shielding room includes a spliced steel shielding structure composed of four vertical walls, a top wall and two shielding room doors, and a closed space is formed inside the steel shielding structure. The access door of the shielding room is arranged on one of the vertical walls, and the interaction door between the shielding room and the working room is arranged on the vertical wall between the shielding room and the external working room. A waveguide window, a filter plate and a glass observation window are also arranged on the vertical wall between the shielding room and the external working room. The shielding room completely shields the interference of external electromagnetic signals, ensures the environmental isolation of the room, meets the imaging requirements of the nuclear magnetic resonance instrument and realizes imaging. The temperature is stable. The shielding room is well sealed, has a ventilation channel, is low in cost and easy to manufacture. However, the patent does not solve the problem of complicated operation caused by disassembling the electromagnetic coils to obtain different magnetic field environments. UTILITY MODEL CONTENTS

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the utility model is the unadjustable electromagnetic coils of the traditional shielding house.

[0005] To solve the above-mentioned problems, the utility model provides a large square magnetic shielding house capable of generating uniform magnetic field, which comprises an outer shell, an inner shell fixedly connected in the outer shell, a wiring cavity formed between the inner shell and the outer shell, a wiring mechanism arranged in the wiring cavity, the wiring mechanism comprising a circular motion assembly, a linear motion assembly, a winding roller, a guide assembly and a winding assembly.

[0006] The linear motion assembly includes a sliding frame parallel to the inner shell, a movable block slidably connected inside the sliding frame, a lead screw threadedly connected to the movable block and installed inside the sliding frame, the lead screw extending to the outside of the rotating ring and fixedly connected to a first motor; the circular motion assembly includes a rotating ring rotatably connected to the inner wall of the wiring cavity, the rotating ring fixedly connected to one end of the sliding frame, a rotating cylinder fixedly connected to the side wall of the rotating ring away from the wiring cavity, the rotating cylinder fixedly connected to the output shaft of a second motor, the second motor driving the rotating cylinder to rotate, and the rotating cylinder driving the rotating ring to rotate;

[0007] The winding rollers are multiple in number and are fixedly connected to the inner wall of the wiring cavity and are distributed equidistantly in a circle within the wiring cavity. Each winding roller includes an axial rod arranged parallel to the inner shell and multiple radial rods equidistantly distributed on the axial rod. The guide assembly includes a movable ring and a fixed ring. The movable ring is connected to the moving block via a first electric push rod. A fixed ring is provided on one side of the movable ring, located outside the radial rod. The fixed ring is fixedly connected to the moving block via a fixed rod. The same cable passes through the movable ring and the fixed ring.

[0008] The cable includes a first cable and a second cable. One end of the first cable is electrically connected to a magnetic field driving power source, and the other end of the first cable is electrically connected to the second cable through a conductive slip ring. The end of the second cable away from the conductive slip ring is electrically connected to the magnetic field driving power source. The winding assembly includes a winding drum, a winding roller rotatably connected to the winding drum, and a third motor that drives the winding roller to rotate. The middle portion of the first cable is wound around the outer end of the winding roller.

[0009] In the aforementioned large square magnetically shielded house that can generate a uniform magnetic field, customized wiring of electromagnetic coils is achieved on the outside of the inner shell through a wiring mechanism.

[0010] As a further improvement of this application, the first cable is abutted against a tensioning assembly at the inlet of the winding drum. The tensioning assembly includes a pair of fixed guide rollers arranged opposite each other and a movable guide roller disposed between the two. The movable guide roller is fixedly connected to a tension detection mechanism, and the tension detection mechanism is connected to a second electric push rod.

[0011] As a further improvement of this application, both the outer shell and the inner shell are rectangular box structures. One end of the inner shell is fixedly connected to the inner wall of one side of the outer shell. The outer side of the inner shell is fixedly connected to the right end plate and the left end plate, which are fixedly connected to the inner wall of the outer shell. The outer shell, the inner shell, the left end plate and the right end plate together form a closed wiring cavity. An inner door panel for closing the inner shell is hinged at the fixed connection between the inner shell and the outer shell. An outer door panel is hinged on the side of the outer shell away from the inner door panel.

[0012] As a further improvement of this application, the outer shell, outer door panel and inner door panel are all made of magnetic shielding material, which is one of copper, aluminum and permalloy.

[0013] As a further improvement of this application, the rotating ring is nested inside the left end plate and rotatably connected to it, the left end of the first cable passes through the rotating ring and is slidably connected to it, and is fixedly connected to the outer wall of the rotating drum. The second motor is fixedly connected to a mounting plate that is fixedly connected to the inner wall of the outer casing.

[0014] As a further improvement of this application, the left end of the axial rod is fixedly connected to the left end plate, and the right end of the axial rod is fixedly connected to the right end plate. Both the axial rod and the radial rod are round rods, and the cable is a sheathed cable.

[0015] As a further improvement of this application, both the movable ring and the fixed ring are circular rings with a diameter larger than that of the cable. The right end of the first cable passes through the right end plate, and the magnetic field drive power supply is fixed on the inner wall of the cavity formed by the right end plate and the outer shell.

[0016] As a further improvement of this application, the tension detection mechanism includes a fixed cylinder fixedly connected to the movable guide roller, a pressure sensor fixedly connected inside the fixed cylinder, a spring abutting the pressure sensor, a pressing rod slidably connected to the fixed cylinder, and the pressing rod extending to the outside of the fixed cylinder and fixedly connected to the movable end of the second electric push rod.

[0017] As a further improvement of this application, the fixed guide roller and the movable guide roller have the same structure. Both include a pair of round rollers and a roller frame rotatably connected to the round rollers. The fixed guide roller is fixedly connected to the rotating cylinder, and the non-moving end of the second electric push rod is fixedly connected to the rotating cylinder.

[0018] In summary, this invention facilitates the wiring of the electromagnetic coil on the outside of the inner shell through the wiring cavity located between the outer and inner shells. Simultaneously, the linear motion component and the circular motion component enable the moving block to perform a helical motion on the outside of the outer shell, cooperating with the winding roller and the movable ring to achieve cable winding on the winding roller. Furthermore, the winding component and the fixed ring work together to maintain the cable under tension during the winding of the electromagnetic coil, improving wiring quality. In addition, the invention allows for precise control of the number of coil turns and cable distribution density of the electromagnetic coil to be wound by controlling the motor speeds of the linear motion component, the circular motion component, and the winding component, demonstrating good practicality and adaptability. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present application;

[0020] Figure 2 This is a cross-sectional structural diagram of this application;

[0021] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0022] Figure 4 for Figure 2Enlarged structural diagram at point B;

[0023] Figure 5 This is a longitudinal sectional view of the structure at the location of the winding assembly in this application;

[0024] Figure 6 This is a schematic diagram of the exploded assembly of this application;

[0025] Figure 7 This is a three-dimensional structural diagram of the guide component in this application;

[0026] Figure 8 This is a schematic diagram of the cable connections in this application;

[0027] Figure 9 This is a schematic diagram of the movement of the moving block and the rotating ring in this application;

[0028] Figure 10 This is an assembly diagram of the movable guide roller and the second electric push rod in this application.

[0029] Explanation of the labels in the diagram:

[0030] 1. Outer shell; 101. Outer door panel; 2. Inner shell; 201. Inner door panel; 3. Right end plate; 4. Left end plate; 5. Winding roller; 501. Axial rod; 502. Radial rod; 6. Cable; 601. First cable; 602. Second cable; 7. Rotating ring; 8. Sliding frame; 9. Moving block; 10. Lead screw; 11. First motor; 12. Rotating cylinder; 13. Second motor; 14. Mounting plate; 15. Movable ring; 16. 17. First electric push rod; 18. Fixed ring; 19. Fixed rod; 10. Rewinding assembly; 1901. Winding drum; 1902. Winding roller; 1903. Third motor; 20. Magnetic field drive power supply; 21. Conductive slip ring; 22. Fixed guide roller; 23. Movable guide roller; 24. Tension detection mechanism; 2401. Fixed cylinder; 2402. Pressure sensor; 2403. Spring; 2404. Extrusion rod; 25. Second electric push rod. Detailed Implementation

[0031] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0032] Implementation method 1:

[0033] Figures 1-9 A large square magnetic shielding room capable of generating a uniform magnetic field is shown, including an outer shell 1; an inner shell 2 is fixedly connected inside the outer shell 1, and a wiring cavity is formed between the inner shell 2 and the outer shell 1. A wiring mechanism is provided inside the wiring cavity, and the wiring mechanism includes a circular motion component, a linear motion component, a winding roller 5, a guide component, and a winding component 19.

[0034] Please see Figures 2-4The linear motion component includes a sliding frame 8 arranged parallel to the inner shell 2. A moving block 9 is slidably connected inside the sliding frame 8. A lead screw 10 installed inside the sliding frame 8 is threadedly connected to the moving block 9. The lead screw 10 extends to the outside of the rotating ring 7 and is fixedly connected to a first motor 11. Specifically, when the first motor 11 drives the lead screw 10 to rotate, the lead screw 10 drives the moving block 9 to move laterally along the sliding frame 8.

[0035] Please see Figures 2-4 The circular motion component includes a rotating ring 7 rotatably connected to the inner wall of the wiring cavity. The rotating ring 7 is fixedly connected to one end of the sliding frame 8. A rotating cylinder 12 is fixedly connected to the side wall of the rotating ring 7 away from the wiring cavity. The output shaft of the second motor 13 is fixedly connected to the rotating cylinder 12. The second motor 13 drives the rotating cylinder 12 to rotate, and the rotating cylinder 12 drives the rotating ring 7 to rotate. Specifically, when the first motor 11 and the second motor 13 are started simultaneously, the moving block 9 performs a spiral motion in the wiring cavity.

[0036] Please see Figure 6 The number of winding rollers 5 is multiple, and the multiple winding rollers 5 are fixedly connected to the inner wall of the wiring cavity and are distributed in a circumferentially equidistant manner within the wiring cavity. The winding roller 5 includes an axial rod 501 arranged parallel to the inner shell 2 and multiple radial rods 502 equidistantly distributed on the axial rod 501.

[0037] Please see Figure 4 and Figure 7 The guide assembly includes a movable ring 15 and a fixed ring 17. The movable ring 15 is connected to the moving block 9 via a first electric push rod 16. A fixed ring 17 is located on one side of the movable ring 15 outside the radial rod 502. The fixed ring 17 is fixedly connected to the moving block 9 via a fixed rod 18. The same cable 6 is threaded through the movable ring 15 and the fixed ring 17. Specifically, when the moving block 9 moves in a spiral motion in the wiring cavity, the first electric push rod 16 pushes the movable ring 15 to insert into the gap of the radial rod 502. The movable ring 15 drives the cable 6 to wind around the radial rod 502, thereby forming a spiral electromagnetic coil on the outside of multiple winding rollers 5.

[0038] Please see Figure 8 The cable 6 includes a first cable 601 and a second cable 602. One end of the first cable 601 is electrically connected to a magnetic field driving power supply 20, and the other end of the first cable 601 is electrically connected to the second cable 602 through a conductive slip ring 21. The end of the second cable 602 away from the conductive slip ring 21 is electrically connected to the magnetic field driving power supply 20. The winding assembly 19 includes a winding drum 1901, a winding roller 1902 rotatably connected to the winding drum 1901, and a third motor 1903 that drives the winding roller 1902 to rotate. The middle part of the first cable 601 is wound around the outer end of the winding roller 1902.

[0039] For details, please refer to Figure 9When wiring the electromagnetic coil, the first motor 11, the second motor 13, and the third motor 1903 are started simultaneously, so that the first cable 601 is released and kept in a taut state, and then wound on the winding roller 5. By controlling the relative speed of the first motor 11, the second motor 13, and the third motor 1903, the number of turns and the distribution density of the cable 6 on the winding roller 5 can be adjusted, thereby controlling the number of turns and the distribution density of the wound electromagnetic coil, which has good practicality and adaptability. It should be noted that when it is necessary to rewind the cable 6, the first motor 11, the second motor 13, and the third motor 1903 are started and reversed, so that the moving block 9 moves in the opposite direction along the winding path. At the same time, the first electric push rod 16 is started, so that the movable ring 15 moves to the outside of the radial rod 502, making it easier for the cable 6 to detach from the radial rod 502.

[0040] Compared to traditional large magnetic shielding enclosures, this invention features a wiring cavity located between the outer shell 1 and the inner shell 2, facilitating the wiring of the electromagnetic coil on the outside of the inner shell 2. Simultaneously, a linear motion component and a circular motion component enable the moving block 9 to perform a helical motion on the outside of the outer shell 1, cooperating with the winding roller 5 and the movable ring 15 to wind the cable 6 onto the winding roller 5. Furthermore, the winding assembly 19 and the fixing ring 17 work together to maintain the cable 6 under tension during the winding of the electromagnetic coil, improving wiring quality. Moreover, the invention allows for precise control of the number of coil turns and the cable 6 distribution density by adjusting the motor speeds of the linear motion component, the circular motion component, and the winding assembly 19, demonstrating good practicality and adaptability.

[0041] Please see Figure 2 and Figure 6 Both the outer shell 1 and the inner shell 2 are rectangular box structures. One end of the inner shell 2 is fixedly connected to the inner wall of one side of the outer shell 1. The outer side of the inner shell 2 is fixedly connected to the right end plate 3 and the left end plate 4, which are fixedly connected to the inner wall of the outer shell 1. The outer shell 1, the inner shell 2, the left end plate 4 and the right end plate 3 enclose a closed wiring cavity. The inner door panel 201 used to close the inner shell 2 is hinged at the fixed connection between the inner shell 2 and the outer shell 1. The outer door panel 101 is hinged to the side of the outer shell 1 away from the inner door panel 201.

[0042] Specifically, the enclosed wiring cavity facilitates real-time winding of electromagnetic coils, and the inner door panel 201 and outer door panel 101 facilitate the entry and exit of personnel and equipment, as well as the maintenance of the wiring mechanism.

[0043] In this embodiment, the outer shell 1, the outer door panel 101 and the inner door panel 201 are all made of magnetic shielding material, which is one of copper, aluminum and permalloy.

[0044] Specifically, the outer shell 1, the outer door panel 101, and the inner door panel 201 form a closed magnetic shielding space, reducing magnetic field leakage and the influence of external magnetic fields on the interior of the magnetic shielding space.

[0045] Please see Figure 3 The rotating ring 7 is nested inside the left end plate 4 and rotatably connected to it. The left end of the first cable 601 passes through the rotating ring 7 and is slidably connected to it. It is wound around the drum 1901 and fixedly connected to the outer wall of the rotating drum 12. The second motor 13 is fixedly connected to the mounting plate 14, which is fixedly connected to the inner wall of the outer casing 1.

[0046] Specifically, the winding drum 1901 rotates synchronously with the rotating drum 12 and the rotating ring 7, reducing the knotting and winding of the cable 6.

[0047] Please see Figure 4 The left end of the axial rod 501 is fixedly connected to the left end plate 4, and the right end of the axial rod 501 is fixedly connected to the right end plate 3. Both the axial rod 501 and the radial rod 502 are round rods, and the cable 6 is a sheathed cable.

[0048] Specifically, both the axial rod 501 and the radial rod 502 are round rods, which reduces friction when the cable 6 comes into contact with the axial rod 501 and the radial rod 502, improving wiring efficiency and reducing damage to the cable 6.

[0049] Please see Figure 4 Both the movable ring 15 and the fixed ring 17 are circular rings with a diameter greater than that of the cable 6. The right end of the first cable 601 passes through the right end plate 3. The magnetic field drive power supply 20 is fixed on the inner wall of the cavity formed by the right end plate 3 and the outer shell 1.

[0050] Specifically, when winding the electromagnetic coil, the right end of the first cable 601 is fixed, and the movable ring 15 drives the first cable 601 to slide and lay wires.

[0051] The second implementation method:

[0052] Figure 3 and Figure 10 A large square magnetic shielding room capable of generating a uniform magnetic field is shown. Based on the first embodiment, the first cable 601 is located at the inlet of the winding drum 1901 and a tensioning assembly is abutted against it. The tensioning assembly includes a pair of fixed guide rollers 22 arranged opposite each other and a movable guide roller 23 arranged between the two. The movable guide roller 23 is fixedly connected to a tension detection mechanism 24, and the tension detection mechanism 24 is connected to a second electric push rod 25.

[0053] Specifically, the tension detection mechanism 24 is moved by the second electric push rod 25, and the tension detection mechanism 24 moves the movable guide roller 23, so that the cable 6 is squeezed and tensioned. At the same time, the tension detection mechanism 24 detects the tension of the cable 6 in real time, reducing the possibility of the cable 6 becoming loose during the wiring process and improving the wiring quality of the electromagnetic coil.

[0054] Please see Figure 10 The tension detection mechanism 24 includes a fixed cylinder 2401 fixedly connected to the movable guide roller 23. A pressure sensor 2402 is fixedly connected inside the fixed cylinder 2401. The pressure sensor 2402 abuts against a spring 2403. The spring 2403 abuts against a pressing rod 2404 slidably connected to the fixed cylinder 2401. The pressing rod 2404 extends to the outside of the fixed cylinder 2401 and is fixedly connected to the movable end of the second electric push rod 25.

[0055] Specifically, when the tension of cable 6 changes, it is quickly sensed by pressure sensor 2402.

[0056] Please see Figure 3 The fixed guide roller 22 and the movable guide roller 23 have the same structure. Both include a pair of round rollers and a roller frame that is rotatably connected to the round rollers. The fixed guide roller 22 is fixedly connected to the rotating cylinder 12, and the non-moving end of the second electric push rod 25 is fixedly connected to the rotating cylinder 12.

[0057] Specifically, the tensioning assembly rotates synchronously with the rotating drum 12 and the winding assembly 19.

[0058] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A large square magnetic shielding room capable of generating a uniform magnetic field, characterized in that, Includes an outer shell (1); an inner shell (2) is fixedly connected inside the outer shell (1), and a wiring cavity is formed between the inner shell (2) and the outer shell (1). A wiring mechanism is provided inside the wiring cavity, and the wiring mechanism includes a circular motion component, a linear motion component, a winding roller (5), a guide component, and a winding component (19). The linear motion assembly includes a sliding frame (8) arranged parallel to the inner shell (2), a moving block (9) slidably connected inside the sliding frame (8), a lead screw (10) threadedly connected to the moving block (9) and installed inside the sliding frame (8), the lead screw (10) extending to the outside of the rotating ring (7) and fixedly connected to a first motor (11); the circular motion assembly includes a rotating ring (7) rotatably connected to the inner wall of the wiring cavity, the rotating ring (7) fixedly connected to one end of the sliding frame (8), a rotating cylinder (12) fixedly connected to the side wall of the rotating ring (7) away from the wiring cavity, the rotating cylinder (12) fixedly connected to the output shaft of a second motor (13), the second motor (13) drives the rotating cylinder (12) to rotate, and the rotating cylinder (12) drives the rotating ring (7) to rotate; The number of the winding rollers (5) is multiple, and the multiple winding rollers (5) are fixedly connected to the inner wall of the wiring cavity and are distributed equidistantly in the circumference within the wiring cavity. The winding rollers (5) include an axial rod (501) arranged parallel to the inner shell (2) and multiple radial rods (502) equidistantly distributed on the axial rod (501). The guide assembly includes a movable ring (15) and a fixed ring (17). The movable ring (15) is connected to the moving block (9) through a first electric push rod (16). A fixed ring (17) located outside the radial rod (502) is provided on one side of the movable ring (15). The fixed ring (17) is fixedly connected to the moving block (9) through a fixed rod (18). The same cable (6) is threaded through the movable ring (15) and the fixed ring (17). The cable (6) includes a first cable (601) and a second cable (602). One end of the first cable (601) is electrically connected to a magnetic field driving power supply (20), and the other end of the first cable (601) is electrically connected to the second cable (602) through a conductive slip ring (21). The end of the second cable (602) away from the conductive slip ring (21) is electrically connected to the magnetic field driving power supply (20). The winding assembly (19) includes a winding drum (1901), a winding roller (1902) rotatably connected to the winding drum (1901), and a third motor (1903) that drives the winding roller (1902) to rotate. The middle part of the first cable (601) is wound around the outer end of the winding roller (1902).

2. The large square magnetic shielding room capable of generating a uniform magnetic field according to claim 1, characterized in that, The first cable (601) is located at the inlet of the winding drum (1901) and a tensioning assembly is abutted against it. The tensioning assembly includes a pair of fixed guide rollers (22) arranged opposite each other and a movable guide roller (23) arranged between the two. The movable guide roller (23) is fixedly connected to a tension detection mechanism (24), and the tension detection mechanism (24) is connected to a second electric push rod (25).

3. A large square magnetic shielding room capable of generating a uniform magnetic field according to claim 1, characterized in that, Both the outer shell (1) and the inner shell (2) are rectangular box structures. One end of the inner shell (2) is fixedly connected to the inner wall of one side of the outer shell (1). The outer side of the inner shell (2) is fixedly connected to the right end plate (3) and the left end plate (4) which are fixedly connected to the inner wall of the outer shell (1). The outer shell (1), the inner shell (2), the left end plate (4) and the right end plate (3) together form a closed wiring cavity. The inner door panel (201) used to close the inner shell (2) is hinged at the fixed connection between the inner shell (2) and the outer shell (1). The outer door panel (101) is hinged on the side of the outer shell (1) away from the inner door panel (201).

4. A large square magnetic shielding room capable of generating a uniform magnetic field according to claim 3, characterized in that, The outer shell (1), outer door panel (101) and inner door panel (201) are all made of magnetic shielding material, which is one of copper, aluminum and permalloy.

5. A large square magnetic shielding room capable of generating a uniform magnetic field according to claim 3, characterized in that, The rotating ring (7) is nested inside the left end plate (4) and rotatably connected to it. The left end of the first cable (601) passes through the rotating ring (7) and is slidably connected to it. The cable is wound around the drum (1901) and fixedly connected to the outer wall of the rotating drum (12). The second motor (13) is fixedly connected to the mounting plate (14) which is fixedly connected to the inner wall of the outer shell (1).

6. A large square magnetic shielding room capable of generating a uniform magnetic field according to claim 3, characterized in that, The left end of the axial rod (501) is fixedly connected to the left end plate (4), and the right end of the axial rod (501) is fixedly connected to the right end plate (3). Both the axial rod (501) and the radial rod (502) are round rods, and the cable (6) is a sheathed cable.

7. A large square magnetic shielding room capable of generating a uniform magnetic field according to claim 3, characterized in that, Both the movable ring (15) and the fixed ring (17) are circular rings with a diameter greater than that of the cable (6). The right end of the first cable (601) passes through the right end plate (3), and the magnetic field driving power supply (20) is fixed on the inner wall of the cavity formed by the right end plate (3) and the outer shell (1).

8. A large square magnetic shielding room capable of generating a uniform magnetic field according to claim 2, characterized in that, The tension detection mechanism (24) includes a fixed cylinder (2401) fixedly connected to the movable guide roller (23), a pressure sensor (2402) fixedly connected inside the fixed cylinder (2401), a spring (2403) abutting the pressure sensor (2402), a pressing rod (2404) slidably connected to the fixed cylinder (2401) by the spring (2403), and the pressing rod (2404) extending to the outside of the fixed cylinder (2401) and fixedly connected to the movable end of the second electric push rod (25).

9. A large square magnetic shielding room capable of generating a uniform magnetic field according to claim 2, characterized in that, The fixed guide roller (22) and the movable guide roller (23) have the same structure. Both include a pair of round rollers and a roller frame that is rotatably connected to the round rollers. The fixed guide roller (22) is fixedly connected to the rotating cylinder (12), and the non-moving end of the second electric push rod (25) is fixedly connected to the rotating cylinder (12).

Images