Shielding system window for marine X-ray chamber

Abstract

The invention belongs to the technical field of marine equipment, and discloses a marine X-ray chamber shielding system window which comprises a mounting panel, a mounting frame is arranged in an inner cavity of the mounting panel, a sealing fixing part is fixedly mounted on one side of the mounting frame, the marine X-ray chamber shielding system window further comprises abutting assemblies, and the abutting assemblies are arranged at the upper end and the lower end of the mounting frame and are symmetrically mounted. Through cooperation of the mounting frame, the abutting assembly and other structures, the sound insulation effect of the system window is better, a fixing plate is pulled, the fixing plate drives a rectangular plate and a first fixing block to move outwards, the first fixing block does not abut against a moving column and a movable plate, a first spring drives the moving column to reset, and the sound insulation effect of the system window is improved. One end of the lead glass is installed in the sealing fixing piece, the other end of the lead glass is installed in the sealing strip, the position of the lead glass is fixed, the sound insulation effect is improved through the double-layer glass design, a comfortable environment is created for ship doctors and patients, and harm of noise to the human body is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of marine equipment, in particular to a marine X-ray room shielding system window. Background Art

[0002] X-rays are electromagnetic waves with extremely short wavelengths and high energy. Due to their strong penetrating power, they are widely used in physics, industry, agriculture and medicine. In medicine, X-ray technology has become a specialized discipline for diagnosing and treating diseases, and occupies an important position in the medical and health industry. In the ship's radiation medical room, doctors need to observe the equipment and the patient's condition through the observation window when operating the X-ray equipment, but ordinary windows cannot shield X-rays. After the human body is irradiated by X-rays, cells will be ionized, affecting cell activity and causing cell death. In severe cases, it can cause radiation sickness. Therefore, in order to prevent X-rays from harming doctors and nurses at work, a shielding window is set between the medical room and the equipment room in the ship's medical room to effectively prevent X-rays from harming observers.

[0003] At present, the X-ray shielding windows of traditional land hospitals are relatively thick and heavy and cannot meet the requirements of the SOLAS Convention for marine ships and the requirements of ship product specifications. The existing X-ray room shielding windows used in ship cabins generally have poor sound insulation performance, and the structure and weight of the shielding windows are large, resulting in poor X-ray shielding and inability to be installed in a compatible manner with the ship cabin environment's ship X-ray room shielding system windows. Therefore, they need to be improved. Summary of the invention

[0004] In order to solve the problems raised in the above background technology that the sound performance is poor and the structure and weight of the shielding window are large, resulting in the inability to shield the X-rays well and the inability to be installed in a compatible manner with the ship's cabin environment. The present invention provides a ship's X-ray room shielding system window.

[0005] To achieve the above object, the present invention provides the following technical solution: a marine X-ray room shielding system window, comprising a mounting panel, an inner cavity of the mounting panel is provided with a mounting frame, a sealing fixture is fixedly installed on one side of the mounting frame, and also comprises a resistance component;

[0006] The abutment components are arranged at the upper and lower ends of the installation frame and are symmetrically installed;

[0007] A movable component, wherein the movable component is fixedly installed on a side away from the sealing fixing member;

[0008] A sealing moving component, which is arranged on a side close to the movable component and is symmetrically installed;

[0009] Wherein, the abutment assembly comprises a rectangular plate, a fixing plate is fixedly mounted on one end of the rectangular plate, and a plurality of first fixing blocks are fixedly mounted on both sides of the rectangular plate;

[0010] The movable assembly comprises a fixed frame, a movable plate is fixedly mounted on one side of the fixed frame, second fixed blocks are fixedly mounted on both sides of the movable plate, and a plurality of movable blocks are fixedly mounted on both sides of the fixed frame;

[0011] The sealing moving assembly comprises a sealing strip, and a plurality of mounting blocks and a spring telescopic rod are fixedly mounted on one side of the sealing strip.

[0012] Preferably, a movable column is provided at the installation frame near the first fixed block, and the movable column is elastically connected to the installation frame through a first spring. One end of the first fixed block near the movable column is an inclined surface, and a suction cup is provided at one end of the movable column away from the first fixed block.

[0013] Preferably, a C-shaped moving block is fixedly mounted on one end of the movable block away from the second fixed block, the C-shaped moving block is elastically connected to the mounting frame via a second spring, and the movable plate is elastically connected to the fixing frame via a third spring.

[0014] Preferably, the top of the second fixed block and one end of the movable block close to the second fixed block are arc-shaped, and the second fixed block and the movable block are in abutting connection.

[0015] Preferably, a slide groove is provided on one side of the fixing frame, and the inner wall of the slide groove is smooth, a slide bar is provided on one side of the movable plate, and two groups of movable components are provided and are symmetrically installed.

[0016] Preferably, one end of the rectangular plate close to the fixing frame is an inclined surface, the bottom of the movable plate is an inclined surface, and the rectangular plate and the movable plate are connected in abutting manner.

[0017] Preferably, a groove is provided on one side of the fixing plate, and the rectangular plate and the fixing plate are both made of aluminum alloy.

[0018] Preferably, the sealing strip is elastically connected to the mounting frame via a spring telescopic rod, an aluminum alloy rectangular plate is provided on one side of the sealing strip close to the spring telescopic rod, and a side of the sealing strip away from the spring telescopic rod is made of rubber material.

[0019] Preferably, slots are provided on both sides of the fixing frame, and the slots are matched with the top of the movable block.

[0020] Preferably, a limiting groove is provided near the fixing plate of the installation frame and is adapted to the length value of the fixing plate. A magnet is provided on one side of the fixing plate near the rectangular plate. A magnet is provided on the inner wall of the limiting groove and has a magnetic pole opposite to that of the rectangular plate.

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

[0022] The present invention achieves better sound insulation effect of the system window by setting up the cooperation of structures such as the installation frame and the interference component. The fixed plate is pulled, and the fixed plate drives the rectangular plate and the first fixed block to move outward. The first fixed block does not interfere with the moving column and the movable plate, so that the first spring drives the moving column to reset. At the same time, the rectangular plate releases the interference with the movable plate, and the lead glass is symmetrically installed in the installation groove of the installation frame. One end of the lead glass is installed in the sealing fixing part and the other end is installed in the sealing strip. The position of the lead glass is fixed. The double-layer glass design improves the sound insulation effect, creates a comfortable environment for medical staff and patients on ships, and reduces the harm of noise to the human body.

[0023] The present invention reduces the time consumed for sealing the lead glass after installation by arranging the cooperation of structures such as the installation block and the C-shaped moving block. The movable blocks on both sides drive the C-shaped moving block to move, so that the C-shaped moving block contacts the installation block. At this time, the sealing strip moves toward the direction close to the sealing fixing part, so that the lead glass is fixed and sealed, avoiding the need for manual repair of the gap between the lead glass and the window after the glass is installed, thereby reducing the time consumed for sealing the lead glass after installation.

[0024] The present invention achieves the effect of light weight when the lead glass is installed by setting up the coordination of structures such as a fixed frame and a rectangular plate. The rectangular plate contacts the movable column, the movable column moves and the first spring contracts, the suction cup on the top of the movable column fixes the lead glass, and the fixed plate is moved until the fixed plate is embedded in the limit groove. At this time, the fixed plate contacts the movable plate, so that the movable plate drives the second fixed block, and the second fixed block moves to contact the movable block, thereby matching the structure and environment of the ship's medical cabin, meeting the requirements of ship product safety and the SOLAS convention for marine ships, and the product has a compact structure and is light in weight, which is suitable for small space and lightweight requirements of ships. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the structural relationship between the sealing moving component and the sealing fixing part of the present invention;

[0028] Figure 4 This is a schematic diagram of the top view of the installation frame of the present invention;

[0029] Figure 5This is a schematic diagram of the structural coordination relationship between the mounting frame and the fixing plate of the present invention;

[0030] Figure 6 It is a schematic diagram of the explosion structure of the movable component and the sealed movable component of the present invention;

[0031] Figure 7 for Figure 6 A schematic diagram of the partially enlarged structure at center A;

[0032] Figure 8 This is a schematic diagram of the explosion structure of the conflicting component of the present invention;

[0033] Fig. 9 It is a schematic diagram of the structural matching relationship between the mounting block and the C-shaped moving block of the present invention.

[0034] In the figure: 1. Installation panel; 2. Installation frame; 3. Resistance assembly; 301. Rectangular plate; 302. Fixed plate; 303. First fixed block; 304. Moving column; 305. First spring; 4. Movable assembly; 401. Fixed frame; 402. Movable plate; 403. Second fixed block; 404. Movable block; 405. C-shaped moving block; 406. Second spring; 407. Third spring; 5. Sealing moving assembly; 501. Sealing strip; 502. Installation block; 503. Spring telescopic rod; 6. Sealing fixing piece. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figures 1 to 9 As shown, the present invention provides a marine X-ray room shielding system window, comprising a mounting panel 1, an inner cavity of the mounting panel 1 is provided with a mounting frame 2, a sealing fixture 6 is fixedly installed on one side of the mounting frame 2, and also comprises a resisting component 3;

[0037] The abutment assembly 3 is arranged at the upper end and the lower end of the installation frame 2, and is symmetrically installed;

[0038] The movable component 4 is fixedly installed on a side away from the sealing fixing member 6;

[0039] The sealing moving component 5 is arranged on a side close to the movable component 4 and is symmetrically installed;

[0040] The abutment assembly 3 includes a rectangular plate 301, a fixing plate 302 is fixedly installed at one end of the rectangular plate 301, and a plurality of first fixing blocks 303 are fixedly installed at both sides of the rectangular plate 301;

[0041] The movable assembly 4 includes a fixed frame 401, a movable plate 402 is fixedly mounted on one side of the fixed frame 401, second fixed blocks 403 are fixedly mounted on both sides of the movable plate 402, and a plurality of movable blocks 404 are fixedly mounted on both sides of the fixed frame 401;

[0042] The sealing moving assembly 5 comprises a sealing strip 501 , on one side of which a plurality of mounting blocks 502 and a spring telescopic rod 503 are fixedly mounted.

[0043] The above scheme is adopted: through the cooperation of the abutment component 3 and the movable component 4, the fixed plate 302 and the rectangular plate 301 are pushed so that the first fixed block 303 abuts against the movable column 304, the movable column 304 moves the first spring 305 to contract, the suction cup on the top of the movable column 304 fixes the lead glass, and the fixed plate 302 is moved until the fixed plate 302 is embedded in the limiting groove. At this time, the fixed plate 302 abuts against the movable plate 402, so that the movable plate 402 drives the second fixed block 403, the second fixed block 403 moves to abut against the movable block 404, and the movable blocks 404 on both sides bring The C-shaped moving block 405 moves so that the C-shaped moving block 405 contacts the installation block 502. At this time, the sealing strip 501 moves toward the sealing fixing part 6, so that the lead glass is fixed and sealed, avoiding the need to manually repair the gap between the lead glass and the window after the glass is installed, thereby matching the structure and environment of the ship's medical cabin, meeting the requirements of ship product safety and the SOLAS Convention for marine ships. The product has a compact structure and light weight, which is suitable for small space and lightweight requirements of ships. At the same time, the system structure effectively prevents X-rays from harming medical personnel.

[0044] like Figures 6 to 8 As shown, a movable column 304 is provided at the installation frame 2 near the first fixed block 303, and the movable column 304 is elastically connected to the installation frame 2 through a first spring 305. The end of the first fixed block 303 near the movable column 304 is presented as an inclined surface, and a suction cup is provided at the end of the movable column 304 away from the first fixed block 303. A C-shaped movable block 405 is fixedly installed at the end of the movable block 404 away from the second fixed block 403. The C-shaped movable block 405 is elastically connected to the installation frame 2 through a second spring 406, and the movable plate 402 is elastically connected to the fixed frame 401 through a third spring 407.

[0045] The above scheme is adopted: through the cooperation between the moving column 304 and the first spring 305, when the first fixed block 303 does not conflict with the moving column 304, the first spring 305 drives the moving column 304 to reset, so as to better fix the lead glass when installing it. The design of the inclined surface of the first fixed block 303 makes it easier to move the rectangular plate 301 to drive the first fixed block 303 to conflict with the moving column 304. The design of the suction cup makes it easier to fix the lead glass after the lead glass is installed. In coordination with the installation of the C-shaped moving block 405, when the second fixed block 403 contacts the movable block 404, the movable block 404 drives the C-shaped moving block 405 to move, causing the C-shaped moving block 405 to contact the installation block 502, thereby causing the sealing strip 501 to move toward the side close to the sealing fixing piece 6, thereby fixing and sealing the lead glass, reducing the time spent on sealing the lead glass alone after the installation is completed. The design of the second spring 406 and the third spring 407 allows the movable plate 402, the movable block 404 and the C-shaped moving block 405 to be reset.

[0046] like Figure 2 , Figure 6 As shown, the top of the second fixed block 403 and the end of the movable block 404 close to the second fixed block 403 are arc-shaped, the second fixed block 403 and the movable block 404 are in abutment connected, a slide groove is provided on one side of the fixed frame 401, and the inner wall of the slide groove is smooth, a slide bar is provided on one side of the movable plate 402, and the movable component 4 is provided with two groups, and is symmetrically installed, the end of the rectangular plate 301 close to the fixed frame 401 is an inclined surface, the bottom of the movable plate 402 is an inclined surface, and the rectangular plate 301 and the movable plate 402 are in abutment connected.

[0047] By adopting the above scheme: through the cooperation of the second fixed block 403 and the movable block 404, the arc-shaped design of the second fixed block 403 and the movable block 404 makes it easier for the movable plate 402 to drive the second fixed block 403 to move and contact the movable block 404, and then the movable block 404 drives the C-shaped movable block 405 to move so that the C-shaped movable block 405 contacts the mounting block 502, and through the cooperation of the fixed frame 401 and the movable plate 402, the design of the sliding groove of the fixed frame 401 and the sliding bar of the movable plate 402, when the rectangular plate 301 contacts or does not contact the movable plate 402, the cooperation of the sliding groove and the sliding bar when the movable plate 402 moves up and down makes the movable plate 402 limit the movable plate 402 when it moves, so that the movable plate 402 is more stable when it moves, Figure 2 and Figure 4It can be seen that the movable component 4 is installed symmetrically up and down, which makes the lead glass more stable during installation. Through the cooperation between the rectangular plate 301 and the movable plate 402, the design of the inclined surfaces of the rectangular plate 301 and the movable plate 402, the rectangular plate 301 can better resist the movable plate 402 when moving, and at the same time, it makes it more labor-saving to resist the movable plate 402.

[0048] like Figure 5 As shown, a groove is provided on one side of the fixed plate 302, the rectangular plate 301 and the fixed plate 302 are both made of aluminum alloy, a limiting groove is provided on the mounting frame 2 near the fixed plate 302, and the limiting groove is adapted to the length value of the fixed plate 302, a magnet is provided on one side of the fixed plate 302 near the rectangular plate 301, and a magnet is provided on the inner wall of the limiting groove, and the magnetic pole is opposite to that of the rectangular plate 301.

[0049] The above scheme is adopted: through the design of the fixed plate 302 and the opening of the groove of the fixed plate 302, it is more convenient to move the fixed plate 302 and the rectangular plate 301. The material of the rectangular plate 301 and the fixed plate 302 is limited. The aluminum alloy has good machinability and can be made into parts of various shapes and sizes through various processing methods. Compared with other metal materials, it is relatively light, but has higher strength and good corrosion resistance. It can be used for a long time under harsh environmental conditions. Through the design of the installation frame 2 and the fixed plate 302, the installation frame 2 has a limiting groove, so that when the lead glass is installed, when the rectangular plate 301 and the fixed plate 302 are moved, until the fixed plate 302 is embedded in the limiting groove, the rectangular plate 301 conflicts with the movable plate 402. The design of the fixed plate 302 magnet and the inner wall magnet of the limiting groove fixes the fixed plate 302 and the rectangular plate 301 to prevent the fixed plate 302 and the rectangular plate 301 from moving.

[0050] like Figure 4 and Figure 6 As shown, the sealing strip 501 is elastically connected to the mounting frame 2 via a spring telescopic rod 503, an aluminum alloy rectangular plate is provided on one side of the sealing strip 501 close to the spring telescopic rod 503, and a side of the sealing strip 501 away from the spring telescopic rod 503 is made of rubber material, and slots are provided on both sides of the fixing frame 401, and the slots are adapted to the top of the movable block 404.

[0051] The above scheme is adopted: through the cooperation of the sealing strip 501 and the spring telescopic rod 503, the design of the sealing strip 501 as an aluminum alloy rectangular plate increases the hardness of the sealing strip 501, so that the mounting block 502 and the spring telescopic rod 503 can be installed better, so that the sealing strip 501 is more stable when moving, and the sealing strip 501 is connected to the mounting frame 2 through the spring telescopic rod 503, so that the sealing strip 501 is fixed, and the material of the spring telescopic rod 503 is limited, so that the lead glass can be protected to avoid damage or bumping to the lead glass during installation. Figure 4 and Figure 5 It can be seen that when the lead glass is installed, the lead glass is installed in a double-layer hollow style. This installation method has the ability to prevent gas leakage, good heat insulation, sound insulation function, and enhanced anti-X-ray ability, making the system window lighter and more comfortable, creating a comfortable environment for ship medical staff and patients, and reducing the harm of noise to the human body. Through the design of the fixed frame 401 and the movable block 404, the slot of the fixed frame 401 is adapted to the movable block 404, so that when the second fixed block 403 conflicts with the movable block 404, the movable block 404 moves into the slot, so that the movable block 404 achieves the maximum movement, thereby better driving the C-shaped movable block 405 to move to conflict with the installation block 502.

[0052] The working principle and use process of the present invention:

[0053] When in use, pull the fixed plate 302, the fixed plate 302 drives the rectangular plate 301 and the first fixed block 303 to move outward, and the first fixed block 303 does not conflict with the moving column 304 and the movable plate 402, so that the first spring 305 drives the movable column 304 to reset, and at the same time the rectangular plate 301 is released from the conflict with the movable plate 402, the third spring 407 expands, the movable plate 402 moves and drives the second fixed block 403 to move, and the conflict between the second fixed block 403 and the movable block 404 is released, the second spring 406 drives the movable block 404 and the C-shaped movable block 405 to reset, and the conflict between the C-shaped movable block 405 and the mounting block 502 is released, and at the same time the spring telescopic rod 503 drives the sealing strip 501 to reset, and then the lead glass is symmetrically installed in the mounting groove of the mounting frame 2, one end of the lead glass is installed in the sealing fixing member 6 and the other end is installed in the sealing strip 501, and the position of the lead glass is fixed;

[0054] Subsequently, the fixed plate 302 and the rectangular plate 301 are pushed so that the first fixed block 303 contacts the movable column 304, and the movable column 304 moves the first spring 305 to contract, and the suction cup on the top of the movable column 304 fixes the lead glass, and the fixed plate 302 is moved until the fixed plate 302 is embedded in the limiting groove, so that the two magnets attract each other to fix the fixed plate 302, and at this time, the fixed plate 302 contacts the movable plate 402, so that the movable plate 402 drives the second fixed block 403, and the second fixed block 403 moves to contact the movable block 404, and the movable blocks 404 on both sides drive the C-shaped movable block 405 to move, so that the C-shaped movable block 405 contacts the mounting block 502 The sealing strip 501 moves toward the sealing fixture 6 to seal the lead glass, thus avoiding the need to manually repair the gap between the lead glass and the window after the glass is installed. The system window is then fixed to the installation panel 1 to match the structure and environment of the ship's medical cabin, meet the requirements of ship product safety and the SOLAS Convention for marine ships, and have a compact structure and light weight, which are suitable for small spaces and lightweight requirements of ships. At the same time, the system structure effectively prevents X-rays from harming medical personnel, and its comprehensive noise reduction performance also creates a comfortable environment for medical staff and patients on board, reducing the harm of noise to the human body.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A marine X-ray room shielding system window, comprising a mounting panel (1), an inner cavity of the mounting panel (1) being provided with a mounting frame (2), a sealing fixture (6) being fixedly mounted on one side of the mounting frame (2), characterized in that: Also includes a conflict component (3); The abutment assembly (3) is arranged at the upper end and the lower end of the installation frame (2) and is symmetrically installed; A movable component (4), wherein the movable component (4) is fixedly mounted on a side away from the sealing fixing member (6); A sealing moving component (5), wherein the sealing moving component (5) is arranged on a side close to the movable component (4) and is symmetrically installed; The abutment assembly (3) comprises a rectangular plate (301), a fixing plate (302) is fixedly mounted on one end of the rectangular plate (301), and a plurality of first fixing blocks (303) are fixedly mounted on both sides of the rectangular plate (301); The movable assembly (4) comprises a fixed frame (401), a movable plate (402) is fixedly mounted on one side of the fixed frame (401), second fixed blocks (403) are fixedly mounted on both sides of the movable plate (402), and a plurality of movable blocks (404) are fixedly mounted on both sides of the fixed frame (401); The sealing moving assembly (5) comprises a sealing strip (501), and a plurality of mounting blocks (502) and a spring telescopic rod (503) are fixedly mounted on one side of the sealing strip (501).

2. The marine X-ray room shielding system window according to claim 1, characterized in that: A movable column (304) is arranged on the installation frame (2) near the first fixed block (303); the movable column (304) is elastically connected to the installation frame (2) via a first spring (305); one end of the first fixed block (303) near the movable column (304) is an inclined surface; and one end of the movable column (304) away from the first fixed block (303) is arranged with a suction cup.

3. The marine X-ray room shielding system window according to claim 1, characterized in that: A C-shaped moving block (405) is fixedly mounted on one end of the movable block (404) away from the second fixed block (403); the C-shaped moving block (405) is elastically connected to the mounting frame (2) via a second spring (406); and the movable plate (402) is elastically connected to the fixed frame (401) via a third spring (407).

4. The marine X-ray room shielding system window according to claim 1, characterized in that: The top of the second fixed block (403) and one end of the movable block (404) close to the second fixed block (403) are arc-shaped, and the second fixed block (403) and the movable block (404) are in abutting connection.

5. The marine X-ray room shielding system window according to claim 1, characterized in that: A slide groove is provided on one side of the fixed frame (401), and the inner wall of the slide groove is smooth. A slide bar is provided on one side of the movable plate (402). Two groups of movable components (4) are provided and are symmetrically installed.

6. The marine X-ray room shielding system window according to claim 1, characterized in that: One end of the rectangular plate (301) close to the fixing frame (401) is an inclined surface, the bottom of the movable plate (402) is an inclined surface, and the rectangular plate (301) and the movable plate (402) are connected in abutting manner.

7. The marine X-ray room shielding system window according to claim 1, characterized in that: A groove is provided on one side of the fixing plate (302), and the rectangular plate (301) and the fixing plate (302) are both made of aluminum alloy.

8. The marine X-ray room shielding system window according to claim 1, characterized in that: The sealing strip (501) is elastically connected to the installation frame (2) via a spring telescopic rod (503); a side of the sealing strip (501) close to the spring telescopic rod (503) is provided with an aluminum alloy rectangular plate; and a side of the sealing strip (501) away from the spring telescopic rod (503) is made of rubber material.

9. The marine X-ray room shielding system window according to claim 1, characterized in that: Slots are provided on both sides of the fixing frame (401), and the slots are adapted to the top of the movable block (404).

10. The marine X-ray room shielding system window according to claim 1, characterized in that: The installation frame (2) is provided with a limiting groove near the fixing plate (302) and is adapted to the length value of the fixing plate (302); a magnet is provided on one side of the fixing plate (302) near the rectangular plate (301); and a magnet is provided on the inner wall of the limiting groove and has a magnetic pole opposite to that of the rectangular plate (301).

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