Civil air defense door stacking spacer and using method

Abstract

The civil defense door stacking spacer comprises a spacer body, the spacer body comprises two sets of supporting columns, the two sets of supporting columns are connected through connecting rods, and lower magnetic attraction stabilizing units are installed in inner cavities of the two sets of supporting columns correspondingly; the first permanent magnet is used for generating magnetic adsorption on a steel member of the civil air defense door located below or a steel bar frame in concrete, so that the supporting column is stably fixed to the civil air defense door, and when the civil air defense door borne at the upper end of the supporting column is moved away, the distance between the first magnet and the civil air defense door is automatically increased. According to the spacer, the supporting columns and the civil air defense door are attracted and fixed through the magnetic action between the first permanent magnets and a steel frame or a steel bar frame in a concrete layer, then the supporting columns can be effectively prevented from sliding, shifting and even sliding off relative to the civil air defense door, and the magnetic attraction action can be automatically relieved; and meanwhile, the spacer can be used for mounting two groups of supporting columns at one time, so that the working efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of air defense door technology, and in particular to an air defense door stacking spacer and its usage method. Background Technology

[0002] In the production process of concrete air-raid shelter doors, in order to improve the space utilization of the production site and reduce space costs, the air-raid shelter doors that have been initially manufactured are usually stacked and stored. In order to prevent the protruding parts on the air-raid shelter doors from being squeezed against each other and damaged, a support structure is set between two adjacent air-raid shelter doors.

[0003] Currently, the industry commonly uses wooden, cylindrical support columns as supporting components between adjacent air-raid shelter doors. These wooden support columns can, to a certain extent, meet basic support requirements, providing necessary mechanical support for the stacking of air-raid shelter doors and ensuring the stability of the stacked structure. However, in actual use, wooden support columns present numerous problems.

[0004] For example, existing wooden support columns are placed directly on the air-raid shelter doors. Under conditions such as stacking, handling, or slight external vibration, the support columns are prone to sliding, displacement, or even falling off the air-raid shelter doors. This not only damages the stacking structure of the air-raid shelter doors, causing them to tilt or collapse, but may also pose a safety threat to workers on the production site and cause safety accidents. Therefore, this application provides an air-raid shelter door stacking spacer and its usage method to meet the needs. Summary of the Invention

[0005] The purpose of this application is to provide a stacking spacer for air-raid shelter doors and a method of using it, in order to solve the technical problems mentioned in the background above.

[0006] To achieve the above objectives, this application provides the following technical solution: a stacking spacer for air-raid shelter doors, comprising a spacer, the spacer comprising two sets of support columns, the two sets of support columns being connected by a connecting rod, and a lower magnetic attraction stabilizing unit installed in the inner cavity of each set of support columns, using a first permanent magnet to generate magnetic attraction to the steel components or the steel reinforcement frame inside the concrete of the air-raid shelter door located below, thereby achieving stable fixing of the support columns to the air-raid shelter door, and when the air-raid shelter door supported by the upper end of the support column is removed, the distance between the first magnet and the air-raid shelter door automatically increases and the magnetic attraction effect is reduced;

[0007] The lower magnetic attraction stabilizing unit includes a first permanent magnet disposed in the inner cavity of the first magnetic shield and a column with a lifting rod slidably installed at its lower end.

[0008] The support column includes a hollow support cylinder and a movable cylinder movably disposed around the periphery of the support cylinder. The upper end of the support cylinder is located in the inner cavity of the movable cylinder. The upper end of the support cylinder and the movable cylinder are connected by a return spring. The bottom of the support cylinder is provided with a first through hole adapted to the first magnetic shield. The upper end of the support cylinder is provided with a support ring.

[0009] The upper end of the column is fixedly connected to the movable cylinder, and the lower end of the column slides through the upper end of the support cylinder and extends into its inner cavity.

[0010] The first magnetic shield is fixed on the blocking plate, and the blocking plate is slidably penetrated by two sets of limiting posts. The first magnetic shield is located directly above the first through hole.

[0011] The upper end of the lifting rod is set as a plane, the right end of the lifting rod is set as an inclined plane, the left end of the lifting rod is connected to the mounting plate on the column through a connecting spring, and a pull rod that slides through the mounting plate is fixed to the left end of the lifting rod. Movable openings are provided on the outer walls of both the support cylinder and the movable cylinder, and a movable plate is slidably provided in the inner cavity of the movable opening on the support cylinder.

[0012] The left end of the pull rod passes through a rectangular opening provided on the movable plate, and two sets of limiting rings are provided on the left end of the pull rod, with the two sets of limiting rings located on both sides of the movable plate respectively;

[0013] The outer ends of the two sets of movable plates are connected by a pull rope, and the pull rope moves through the connecting rod. The connecting rod is provided with a handle, and a pressing column is movably installed on the handle. The lower end of the pressing column is fixedly connected to the pull rope.

[0014] The end of the connecting rod passes through the movable opening and is fixedly connected to the outer wall of the support cylinder;

[0015] Initially, the upper right end of the lifting rod contacts the lower end of the blocking plate, and the first permanent magnet is suspended in the air.

[0016] As a preferred embodiment of this invention, an upper magnetic stabilizing unit is also provided, which is used by the second permanent magnet to generate magnetic attraction on the steel components or the steel reinforcement frame inside the concrete of the above-mentioned air-raid shelter door.

[0017] As a preferred embodiment of this embodiment, the upper magnetic adsorption unit includes a second magnetic shield fixedly disposed on the upper end of the support cylinder and a second through hole disposed on the upper end of the movable cylinder;

[0018] The second permanent magnet is located inside the cavity of the second magnetic shield, which is located directly below the second through hole.

[0019] In a preferred embodiment of this invention, initially, the straight-line distance between the upper end face of the support ring and the top surface of the inner cavity of the movable cylinder is denoted as a, and the straight-line distance between the lower end face of the movable cylinder and the lower end face of the support cylinder is denoted as b, and a=b.

[0020] In a preferred embodiment of this invention, the outer wall of the movable cylinder is configured as a tapered structure that is narrower at the top and wider at the bottom.

[0021] In a preferred embodiment of this invention, the acute angle formed between the outer surface of the movable cylinder and the horizontal plane is 35° to 45°.

[0022] In a preferred embodiment of this invention, the inner walls of both the support cylinder and the movable cylinder are provided with a magnetic shielding coating, and both the support cylinder and the movable cylinder are made of stainless steel.

[0023] A method for using a stacking spacer for air-raid shelter doors includes the following steps:

[0024] S1: Place the two sets of support columns of this spacer directly on the upper side of one side of the air defense door. Press the pressing column to release the lifting rod from limiting the blocking plate, so that the first permanent magnet falls and magnetically attracts the air defense door. Then, repeat the process to place the other set of spacers on the upper side of the other side of the air defense door.

[0025] S2: Use a crane to lift another air defense door to the top and complete the stacking. During the stacking, the weight of the air defense door above will act on the movable cylinder, causing the movable cylinder to compress the return spring and move downward. Finally, the top of the inner cavity of the movable cylinder will contact the upper end of the support ring to form support. During this process, as the movable cylinder moves downward, it will drive the lifting rod to move downward, and finally the right end of the lifting rod will be located below the blocking plate.

[0026] S3: When the air-raid shelter door above is hoisted away, the piston cylinder will move upward and eventually return to its original position under the action of the return spring. During this process, the column will drive the baffle plate to move upward and return to its original position through the lifting rod, automatically increasing the distance between the first permanent magnet and the air-raid shelter door, so that the magnetic force between the two is reduced. Afterwards, the support column can be directly removed from the air-raid shelter door manually.

[0027] In summary, the technical effects and advantages of this invention are as follows:

[0028] 1. The present invention has a reasonable structure and is equipped with a lower magnetic attraction stabilizing unit. The support column is attracted and fixed to the air defense door by the magnetic force between the first permanent magnet and the steel frame or the steel reinforcement inside the concrete layer. This can effectively prevent the support column from sliding, shifting or even falling off relative to the air defense door, and can automatically release the magnetic attraction. At the same time, this spacer can install two sets of support columns at one time, which greatly improves work efficiency.

[0029] 2. In this invention, an upper magnetic stabilizing unit is provided. By cooperating with the upper magnetic stabilizing unit, it is beneficial to the overall stability of the stacked air defense doors. This support column can automatically complete the magnetic separation between the first permanent magnet and the second permanent magnet and the air defense door, making the operation of this support column convenient and simple.

[0030] 3. In this invention, the outer wall of the movable cylinder is set as a tapered structure that is narrow at the top and wide at the bottom. The downward movement of the movable cylinder can buffer the collision and reduce the damage to the air defense door and the support column caused by direct impact. At the same time, the two support columns of this spacer are connected together by a connecting rod, so that the two support columns form a whole, which can further improve the stability of the support columns. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0033] Figure 2 for Figure 1 A magnified schematic diagram of the central part of the structure;

[0034] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the central support column;

[0035] Figure 4 for Figure 3 Schematic diagram of the lifting rod structure;

[0036] Figure 5 This is a schematic diagram of the connection structure between the movable plate and the tie rod and connecting rod;

[0037] Figure 6 This is a schematic diagram of the cross-sectional structure of the grip.

[0038] In the diagram: 1. Connecting rod; 2. Hand grip; 3. Support cylinder; 4. Movable cylinder; 5. First magnetic shield; 6. Blocking plate; 7. Support ring; 8. Limiting post; 9. First through hole; 10. Second through hole; 11. Column; 12. Mounting plate; 13. Lifting rod; 14. Inclined surface; 15. Pull rod; 16. Movable plate; 17. Connecting spring; 18. Movable opening; 19. Second magnetic shield; 20. Second permanent magnet; 21. Return spring; 22. Abutting post; 23. Pull rope; 24. Limiting ring; 25. Pressing post. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example: Reference Figure 1-6 The diagram shows a stacking spacer for air-raid shelter doors, which includes a spacer comprising two sets of support columns connected by a connecting rod 1. Each set of support columns has a lower magnetic stabilizing unit installed within its inner cavity. A first permanent magnet magnetically attracts the steel components or reinforcing steel frame inside the concrete of the lower air-raid shelter door, thereby stably fixing the support columns to the air-raid shelter door. When the air-raid shelter door supported by the upper end of the support column is removed, the distance between the first magnet and the air-raid shelter door automatically increases, reducing the magnetic attraction.

[0041] In use, the two sets of support columns with lower magnetic fixing units are placed directly on the steel frame or concrete layer of the air-raid shelter door. The support columns are attracted and fixed to the air-raid shelter door by the magnetic force between the first permanent magnet and the steel reinforcement frame inside the steel frame or concrete layer, which can effectively prevent the support columns from sliding, shifting or even falling off relative to the air-raid shelter door.

[0042] Furthermore, when the air defense door supported by the upper end of the support column is removed, the distance between the first magnet and the air defense door gradually increases, which can reduce the magnetic force between the support column and the air defense door below, thus making it easier to remove the support column from the air defense door.

[0043] The lower magnetic attraction stabilizing unit includes a first permanent magnet disposed in the inner cavity of the first magnetic shield 5 and a column 11 with a lifting rod 13 slidably mounted on its lower end;

[0044] The support column includes a hollow support cylinder 3 and a movable cylinder 4 movably disposed around the support cylinder 3. The upper end of the support cylinder 3 is located in the inner cavity of the movable cylinder 4. The upper end of the support cylinder 3 and the movable cylinder 4 are connected by a return spring 21. The bottom of the support cylinder 3 is provided with a first through hole 9 that is adapted to the first magnetic shielding cover 5. The upper end of the support cylinder 3 is provided with a support ring 7.

[0045] The upper end of the column 11 is fixedly connected to the movable cylinder 4, and the lower end of the column 11 slides through the upper end of the support cylinder 3 and extends into its inner cavity.

[0046] The first magnetic shield 5 is fixed on the baffle plate 6, and the baffle plate 6 is slidably penetrated by two sets of limiting posts 8. The first magnetic shield 5 is located directly above the first through hole 9.

[0047] The upper end of the lifting rod 13 is set as a plane, the right end of the lifting rod 13 is set as an inclined plane 14, the left end of the lifting rod 13 is connected to the mounting plate 12 on the column 11 through the connecting spring 17, and the left end of the lifting rod 13 is fixed with a pull rod 15 that slides through the mounting plate 12. The outer walls of the support cylinder 3 and the movable cylinder 4 are both provided with movable openings 18, and the inner cavity of the movable opening 18 on the support cylinder 3 is slidably provided with a movable plate 16.

[0048] The left end of the pull rod 15 passes through a rectangular opening provided on the movable plate 16. Two sets of limiting rings 24 are provided on the left end of the pull rod 15, and the two sets of limiting rings 24 are located on both sides of the movable plate 16 respectively.

[0049] The outer ends of the two sets of movable plates 16 are connected by a pull rope 23, and the pull rope 23 moves through the connecting rod 1. The connecting rod 1 is provided with a handle 2, and a pressing column 25 is movably installed on the handle 2. The lower end of the pressing column 25 is fixedly connected to the pull rope 23.

[0050] The end of the connecting rod 1 passes through the movable opening 18 and is fixedly connected to the outer wall of the support cylinder 3;

[0051] A stop post 22 is fixed to the lower end of the baffle plate 6.

[0052] Initially, the upper right end of the lifting rod 13 contacts the lower end of the blocking plate 6, and the first permanent magnet is suspended in the air.

[0053] In use, place the two sets of support columns of this spacer on the upper side of one side of the air-raid shelter door. Pressing the pressing column 25 causes the two ends of the pull rope 23 to converge (which will cause the movable plate 16 to move outward). This causes the pull rod 15 to drive the lifting rod 13 to move laterally away from the blocking plate 6, releasing the contact between the lifting rod 13 and the blocking plate 6. The first permanent magnet moves downward under the action of gravity, and finally causes the lower end of the first magnetic shield 5 to pass through the first through hole 9. The first permanent magnet is magnetically attracted and fixed to the air-raid shelter door. Release the pressing column 25, and through the elastic force of the connecting spring 17, the lifting rod 13 and the pressing column 25 return to their original positions. Repeat the same process to place another set of spacers on the upper side of the air-raid shelter door. Then, use a crane to lift the other air-raid shelter door to the top and stack it. During stacking, the weight of the air-raid shelter door above will act on the movable cylinder 4, and cause... The movable cylinder 4 compresses the return spring 21 and moves downward, eventually causing the top of the inner cavity of the movable cylinder 4 to contact the upper end of the support ring 7 to form a support. During this process, as the movable cylinder 4 moves downward, it will drive the lifting rod 13 to move downward, eventually causing the right end of the lifting rod 13 to be below the blocking plate 6. When the upper air defense door is hoisted away, the pressure on the support column gradually decreases. Under the action of the return spring 21, the piston cylinder 4 will move upward and eventually return to its original position. During this process, the column 11 will drive the blocking plate 6 to move upward and return to its original position through the lifting rod 13, automatically increasing the distance between the first permanent magnet and the air defense door, reducing the magnetic force between the two, which is conducive to the subsequent manual removal of the support column from the air defense door. During this process, it will be subject to less magnetic force or no magnetic force, which facilitates the use of this support column.

[0054] This spacer can install two sets of support columns at once, which is more convenient and faster than installing a single support column, greatly improving work efficiency.

[0055] It should be noted that: First, an inclined surface 14 is provided at the right end of the lifting rod 13. When the lifting rod 13 moves downward, the inclined surface 14 will abut against the left end of the blocking plate 6, causing the lifting rod 13 to compress the connecting spring 17 and move to the left, ultimately causing the right end of the lifting rod 13 to move below the blocking plate 6; Second, an abutment post 22 is fixed at the lower end of the blocking plate 6 (e.g., Figure 6 As shown), the lower end of the contact post 22 is located below the lifting rod 13. When the first permanent magnet is magnetically attracted to the air defense door, the lower end of the contact post 22 abuts against the bottom of the inner cavity of the support cylinder 3, applying downward pressure to the support cylinder 3. At the same time, the setting of the contact post 22 allows a gap to be left between the blocking plate 6 and the bottom of the inner cavity of the support cylinder 3, which facilitates the insertion of the lifting rod 13. Third, the end of the pull rod 15 passes through the rectangular opening on the movable plate 16. The setting of the rectangular opening facilitates the pull rod 15 to move up and down along the rectangular opening.

[0056] As a preferred embodiment of this invention, an upper magnetic stabilizing unit is also provided, which is used by the second permanent magnet 20 to generate magnetic attraction on the steel components or the steel reinforcement frame inside the concrete of the above-mentioned air-raid shelter door.

[0057] Using the upper magnetic stabilizing unit, after the piston cylinder 4 on the support column is pressed, the upper magnetic stabilizing unit can magnetically attract and fix the upper air defense door, so that both ends of the stacked air defense doors (except the top and bottom) are subjected to magnetic force, which is beneficial to the overall stability of the stacked air defense doors.

[0058] As a preferred embodiment of this example, Figure 3 As shown, the upper magnetic adsorption unit includes a second magnetic shield 19 fixedly disposed on the upper end of the support cylinder 3 and a second through hole 10 disposed on the upper end of the movable cylinder 4;

[0059] The second permanent magnet 20 is located inside the cavity of the second magnetic shield 19, which is located directly below the second through hole 10.

[0060] Initially, there is a gap between the upper end of the second permanent magnet 20 and the top of the inner cavity of the movable cylinder 4, so that the second permanent magnet 20 has a small or no magnetic force on the air defense door above the movable cylinder 4 at the beginning, effectively avoiding magnetic influence on the air defense door suspended in the air during hoisting (avoiding the phenomenon of uneven stacking of air defense doors).

[0061] As the upper air-raid shelter door comes into contact with the upper end of the movable cylinder 4 (the two sides of this air-raid shelter door are aligned and only moving vertically downwards), the downward movement of the upper air-raid shelter door will drive the movable cylinder 4 downwards. The distance between the upper air-raid shelter door and the second permanent magnet 20 becomes smaller and smaller, and the magnetic force generated becomes larger and larger. Finally, the movable cylinder 4 is blocked by the blocking ring 7 and stops moving downwards. At this time, the second permanent magnet 20 generates a magnetic attraction effect on the upper air-raid shelter door. Through the cooperation of the first permanent magnet and the second permanent magnet 20, the overall stability of the stacked air-raid shelter doors can be improved (the magnetic force makes the stacked air-raid shelter doors connected into a whole).

[0062] When the upper air defense door is removed, the movable cylinder 4 moves upward and returns to its original position under the elastic force of the return spring 21. During this process, the magnetic force between the second permanent magnet 20 and the upper air defense door gradually decreases to 0, so that the two automatically separate magnetically.

[0063] This support column can automatically complete the magnetic separation between the first permanent magnet and the second permanent magnet 20 and the air defense door. Moreover, it is only necessary to pull the lever 15 to release the limit of the lifting lever 13 on the blocking plate 6. At this time, the blocking plate 6 moves downward and completes the magnetic adsorption of the first permanent magnet and the air defense door below, making the operation of this support column convenient and simple.

[0064] As a preferred embodiment of this example, Figure 3 As shown, initially, the straight-line distance between the upper end face of the support ring 7 and the top surface of the inner cavity of the movable cylinder 4 is denoted as a, and the straight-line distance between the lower end face of the movable cylinder 4 and the lower end face of the support cylinder 3 is denoted as b, and a=b.

[0065] The design of a=b ensures that when the top of the inner cavity of the movable cylinder 4 contacts the support ring 7 and can no longer move downwards, the bottom of the movable cylinder 4 just contacts the end face of the air-raid shelter door. This increases the contact area between the support column and the air-raid shelter door, disperses the force, and avoids excessive local stress on the support column.

[0066] As a preferred embodiment of this example, Figure 3 As shown, the outer wall of the movable cylinder 4 is configured as a tapered structure that is narrower at the top and wider at the bottom.

[0067] When the air-raid shelter door collides with the movable cylinder 4 during hoisting, the force can be decomposed and buffered by the tapered structure that is narrow at the top and wide at the bottom. During buffering, the movable cylinder 4 moves downward to compress the return spring 21 due to the impact pressure, reducing the direct impact damage to the air-raid shelter door and the support column.

[0068] Furthermore, the two support columns of this spacer are connected together by the connecting rod 1, so that the two support columns form a whole, which can further improve the stability of the individual support column when it collides. That is, even if the movable cylinder 4 is collided, it is difficult for this spacer to change displacement.

[0069] In a preferred embodiment of this invention, the acute angle formed between the outer surface of the movable cylinder 4 and the horizontal plane is 35° to 45°.

[0070] If the angle is too large (greater than 45°), the efficiency of lateral force decomposition is low and the buffering effect is not obvious; if the angle is too small (less than 35°), the bottom diameter of the movable cylinder 4 will be too large, making the entire support column cumbersome, inconvenient for personnel to handle, and increasing production costs.

[0071] As a preferred embodiment of this invention, the inner walls of both the support cylinder 3 and the movable cylinder 4 are provided with a magnetic shielding coating to prevent the magnetic force of the first permanent magnet and the second permanent magnet 20 from affecting the outside world. Furthermore, the support cylinder 3 and the movable cylinder 4 are made of stainless steel, and products made of stainless steel have a long service life.

[0072] A method for using a stacking spacer for air-raid shelter doors includes the following steps:

[0073] S1: Place the two sets of support columns of this spacer directly on the upper side of one side of the air defense door. Press the pressing column 25 to release the limit of the lifting rod 13 on the blocking plate 6, so that the first permanent magnet falls and magnetically attracts the air defense door. Then, in the same way, place the other set of spacers on the upper side of the other side of the air defense door.

[0074] S2: Use a crane to lift another air defense door to the top and complete the stacking. During the stacking, the weight of the air defense door above will act on the movable cylinder 4, causing the movable cylinder 4 to compress the return spring 21 and move downward. Finally, the top of the inner cavity of the movable cylinder 4 will contact the upper end of the support ring 7 to form support. During this process, as the movable cylinder 4 moves downward, it will drive the lifting rod 13 to move downward, and finally the right end of the lifting rod 13 will be located below the blocking plate 6.

[0075] S3: When the upper air defense door is hoisted away, the piston cylinder 4 will move upward and eventually return to its original position under the action of the return spring 21. During this process, the column 11 will drive the blocking plate 6 to move upward and return to its original position through the lifting rod 13, automatically increasing the distance between the first permanent magnet and the air defense door, so that the magnetic force between the two is reduced. Then, the support column can be removed directly from the air defense door manually.

[0076] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stacking spacer for air-raid shelter doors, comprising a spacer, characterized in that: The spacer includes two sets of support columns, which are connected by a connecting rod (1). The inner cavity of each set of support columns is equipped with a lower magnetic attraction stabilizing unit. The first permanent magnet is used to generate magnetic attraction to the steel components of the air defense door or the steel reinforcement frame inside the concrete located below, thereby realizing the stable fixing of the support column to the air defense door. When the air defense door carried by the upper end of the support column is removed, the distance between the first magnet and the air defense door automatically increases and the magnetic attraction effect is reduced. The lower magnetic attraction stabilizing unit includes a first permanent magnet disposed in the inner cavity of the first magnetic shield (5) and a column (11) with a lifting rod (13) slidably installed at the lower end. The support column includes a hollow support cylinder (3) and a movable cylinder (4) movably disposed around the support cylinder (3). The upper end of the support cylinder (3) is located in the inner cavity of the movable cylinder (4). The upper end of the support cylinder (3) is connected to the movable cylinder (4) by a return spring (21). The bottom of the support cylinder (3) is provided with a first through hole (9) adapted to the first magnetic shield (5). The upper end of the support cylinder (3) is provided with a support ring (7). The upper end of the column (11) is fixedly connected to the movable cylinder (4), and the lower end of the column (11) slides through the upper end of the support cylinder (3) and extends into its inner cavity. The first magnetic shield (5) is fixed on the baffle plate (6), and the baffle plate (6) is slidably penetrated by two sets of limiting posts (8). The first magnetic shield (5) is located directly above the first through hole (9). The upper end of the lifting rod (13) is set as a plane, the right end of the lifting rod (13) is set as an inclined plane (14), the left end of the lifting rod (13) is connected to the mounting plate (12) on the column (11) through the connecting spring (17), and the left end of the lifting rod (13) is fixed with a pull rod (15) that slides through the mounting plate (12). The outer walls of the support cylinder (3) and the movable cylinder (4) are both provided with movable openings (18), and the inner cavity of the movable opening (18) on the support cylinder (3) is slidably provided with a movable plate (16). The left end of the pull rod (15) passes through the rectangular opening provided on the movable plate (16), and two sets of limiting rings (24) are provided on the left end of the pull rod (15), and the two sets of limiting rings (24) are respectively located on both sides of the movable plate (16). The outer ends of the two sets of movable plates (16) are connected by a pull rope (23), and the pull rope (23) moves through the connecting rod (1). The connecting rod (1) is provided with a handle (2), and a pressing column (25) is movably installed on the handle (2). The lower end of the pressing column (25) is fixedly connected to the pull rope (23). The end of the connecting rod (1) passes through the movable opening (18) and is fixedly connected to the outer wall of the support cylinder (3); The lower end of the baffle plate (6) is fixed with an abutment post (22). Initially, the upper right end of the lifting rod (13) contacts the lower end of the blocking plate (6), and the first permanent magnet is suspended in the air.

2. The stacking spacer for air-raid shelter doors and its method of use according to claim 1, characterized in that: It is also equipped with an upper magnetic stabilizing unit for the second permanent magnet (20) to generate magnetic adsorption on the steel components or the steel reinforcement frame inside the concrete of the above-mentioned civil defense door.

3. The stacking spacer for air-raid shelter doors and its method of use according to claim 2, characterized in that: The upper magnetic adsorption unit includes a second magnetic shield (19) fixedly disposed on the upper end of the support cylinder (3) and a second through hole (10) disposed on the upper end of the movable cylinder (4). The second permanent magnet (20) is located in the inner cavity of the second magnetic shield (19), and the second magnetic shield (19) is located directly below the second through hole (10).

4. The stacking spacer for air-raid shelter doors and its method of use according to claim 1, characterized in that: Initially, the straight-line distance between the upper end face of the support ring (7) and the top surface of the inner cavity of the movable cylinder (4) is denoted as a, and the straight-line distance between the lower end face of the movable cylinder (4) and the lower end face of the support cylinder (3) is denoted as b, and a=b.

5. The stacking spacer for air-raid shelter doors and its method of use according to claim 1, characterized in that: The outer wall of the movable cylinder (4) is configured as a tapered structure that is narrow at the top and wide at the bottom.

6. The stacking spacer for air-raid shelter doors and its method of use according to claim 5, characterized in that: The acute angle formed between the outer surface of the movable cylinder (4) and the horizontal plane is 35° to 45°.

7. The stacking spacer for air-raid shelter doors and its method of use according to claim 1, characterized in that: The inner walls of the support cylinder (3) and the movable cylinder (4) are provided with a magnetic shielding coating, and the support cylinder (3) and the movable cylinder (4) are made of stainless steel.

8. The method of using a stacking spacer for air-raid shelter doors as described in claims 1-7, characterized in that: Includes the following steps, S1: Place the two sets of support columns of this spacer directly on the upper side of one side of the air defense door. By pressing the pressing column (25), release the limit of the lifting rod (13) on the blocking plate (6), so that the first permanent magnet falls and magnetically attracts the air defense door. Then, in the same way, place the other set of spacers on the upper side of the other side of the air defense door. S2: Use a crane to lift another blast door to the top and stack it. During stacking, the weight of the blast door above will act on the movable cylinder (4), causing the movable cylinder (4) to compress the return spring (21) and move downward. Finally, the top of the inner cavity of the movable cylinder (4) will contact the upper end of the support ring (7) to form a support. During this process, as the movable cylinder (4) moves downward, it will drive the lifting rod (13) to move downward, and finally the right end of the lifting rod (13) will be located below the baffle plate (6). S3: When the upper air defense door is hoisted away, the piston cylinder (4) will move upward and eventually return to its original position under the action of the spring force of the return spring (21). During this process, the column (11) will drive the blocking plate (6) to move upward and return to its original position through the lifting rod (13), automatically increasing the distance between the first permanent magnet and the air defense door, so that the magnetic force between the two is reduced, and then the support column can be directly removed from the air defense door by manual labor.

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