Steel structure protective door for civil air defense engineering

By designing a steel structure protective door in the civil defense engineering, the automatic sliding and locking of the protective door is achieved using the double push wheel and cross-sliding mechanism, and the door body is hidden through the screw groove rod and the linkage column mechanism, the problem of the protective door requiring extra time to lock and occupy too much space in the prior art is solved.

CN222863242UActive Publication Date: 2025-05-13ANHUI HUACHENG CIVIL AIR DEFENSE EQUIP CO LTD
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Patent Information

Application Number
CN202421853927.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-02
Publication Date
2025-05-13
Estimated Expiration
2034-08-02

AI Technical Summary

Technical Problem

Existing civil defense engineering protective doors require additional time to lock after closing in an emergency and take up too much space when idle.

Method used

A civil defense engineering steel structure protective door is designed, which drives the cross-slide plate to slide through the double push wheel, drives the pressing block and firmware block to push the protective door to slide in opposite directions, and automatically locks and hides the protective door through the screw groove rod and linkage column mechanism.

Benefits of technology

It realizes automatic locking of protective doors in emergency situations, saving time to lock after closing, and hiding the door in the masonry structure when it is idle, solving the problem of excessive space occupation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a steel structure protective door for civil air defense engineering, which relates to the technical field of civil air defense engineering and comprises a protective door, a wall connecting frame is slidably connected to the outer surface of the protective door, and a storage bin is fixedly connected to the upper surface of the wall connecting frame. According to the utility model, the design structure is reasonable, the transverse sliding plates on the two sides can be pushed to slide oppositely through the double push wheels, so that the transverse sliding plates on the two sides respectively drive the pressing block and the fixing block to drive the protective door below the pressing block and the fixing block to slide oppositely, and the part of the slope block slides into the pressing block in the opposite sliding process of the pressing block and the fixing block; the column fixing piles outside the pressing block extrude the inclined face of the single-hole plate, after the single-hole plate is pressed into the pressing block, the single-hole plate is pushed out by the spring wrapping rod, the column fixing piles are clamped by the plane of the inclined face block, the protective door is automatically locked after being automatically closed, and the purpose that the protective door is automatically locked after being closed is achieved. The problem that time is wasted due to the fact that locking is conducted after the protective door is closed under the emergency condition is solved.
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Description

Technical Field

[0001] The utility model relates to the technical field of civil air defense engineering, in particular to a steel structure protective door for civil air defense engineering. Background Art

[0002] Civil air defense projects, also known as civil air defense projects, refer to underground protective buildings built separately to ensure the shelter of personnel and materials, civil air defense command, and medical rescue in wartime, as well as basements that can be used for air defense in wartime built in combination with ground buildings. Civil air defense projects are important facilities for preventing sudden enemy attacks, effectively sheltering personnel and materials, and preserving war potential.

[0003] The protective door is an important part of the civil air defense project. When the civil air defense door is needed in an emergency, closing the door and then locking it may waste time. When the protective door is not needed, due to the main structure of the protective door, the protective door occupies too much space when idle. To this end, we provide a steel structure protective door for civil air defense projects to solve the above problems. Utility Model Content

[0004] 1) Technical issues solved

[0005] The purpose of the utility model is to make up for the deficiencies of the prior art and to provide a steel structure protective door for civil air defense projects.

[0006] 2) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a protective door of a steel structure for civil air defense engineering, comprising a protective door, a wall frame being slidably connected to the outer surface of the protective door, a storage bin being fixedly connected to the upper surface of the wall frame, an inner surface of the storage bin being rotatably connected to an inner shaft, a double push wheel being fixedly connected to the outer circumferential surface of the inner shaft, a transverse slide being meshed with teeth of the double push wheels, a storage bin being slidably connected to the outer surface of the transverse slide, a pressure piece block being fixedly connected to the outer surface of the transverse slide, a fixed column pile being fixedly connected to the inner arc surface of the pressure piece block, a closing column being fixedly connected to the outer surface of the closing column on a side of the solid column pile away from the protective door, a protective door being fixedly connected to the outer surface of the pressing piece block on a side away from the closing column, a slope block being clamped on the outer surface of the closing column, and the slope block being close to the outer surface of the protective door The surface is fixedly connected with a single-hole plate, the outer surface of the single-hole plate is slidably connected with a pressure block, the outer surface of the single-hole plate is slidably connected with a fixing block, the inner surface of the fixing block is clamped with a fixed column pile, the outer surface of the fixing block away from the closing column is fixedly connected with a protective door, the outer surface of the fixing block away from the closing column is fixedly connected with a cross slide, the inner surface of the fixing block is fixedly connected with a spring rod, the outer circumferential surface of the spring rod is slidably connected with the single-hole plate, the outer surface of the single-hole plate is fixedly connected with a linkage column, the outer surface of the linkage column is slidably connected with the fixing block, the outer surface of the linkage column away from the protective door is clamped with a protrusion plate, the outer surface of the protrusion plate is slidably connected with the fixing block, the inner surface of the protrusion plate is threadedly connected with a screw groove rod, and the screw groove rod is rotatably connected to the inner wall of the fixing block at one end close to the protective door.

[0008] Furthermore, the protective door is composed of two square plates, the outer surfaces of which are slidably connected to a wall frame, the upper surfaces of which are fixedly connected to an inverted convex column, the outer surfaces of which are slidably connected to the wall frame, one of the square plates having a pressing block fixedly connected to its outer surface, and the other having a fixing block fixedly connected to its outer surface.

[0009] Furthermore, the wall connecting frame is two rectangular columns, the outer surface of the rectangular columns is provided with a rectangular groove, the inner surface of the rectangular groove is slidably connected to a protective door, the upper ends of the two rectangular columns are fixedly connected to the rectangular columns, the lower surface of the rectangular columns is provided with an inverted convex groove, and the inner surface of the convex groove is slidably connected to the protective door.

[0010] Furthermore, the storage bin is a rectangular tube, the lower surface of which is fixedly connected to a wall frame, the outer surface of the rectangular tube is provided with a circular hole that penetrates to the inner wall of the rectangular tube, the inner surface of the circular hole is rotatably connected to an inner shaft, the inner surface of the rectangular tube is slidably connected to a horizontal slide plate, the outer surface of the rectangular tube close to the firmware block is provided with two rectangular grooves that penetrate to the inner wall of the rectangular tube, and the inner wall of the rectangular groove is slidably connected to a horizontal slide plate.

[0011] Furthermore, the horizontal sliding plate is composed of two rectangular columns, and a storage bin is slidably connected to the outer surface of the rectangular column, and teeth are provided on the outer surface of the rectangular column close to the inner shaft, and a double push wheel is meshed with the teeth, and a square key is fixedly connected to the outer surface of the rectangular column, and the storage bin is slidably connected to the outer surface of the square key, and the upper square key is fixedly connected to the outer surface of the side away from the upper rectangular column with a fixing block, and the lower square key is fixedly connected to the outer surface of the side away from the lower rectangular column with a pressing block.

[0012] Furthermore, the pressing block is a rectangular column, a protective door is fixedly connected to the outer surface of the rectangular column, a square plate is fixedly connected to the upper surface of the rectangular column, a horizontal sliding plate is fixedly connected to the outer surface of the rectangular plate, an arc groove is provided on the outer surface of the rectangular column close to the fixing block, a column pile is fixedly connected to the inner surface of the arc groove, two square grooves are provided on the outer surface of the rectangular column away from the protective door, a single-hole plate is slidably connected to the inner surface of the square groove, and a slope block is slidably connected to the inner surface of the square groove.

[0013] Furthermore, the firmware block is a rectangular column, a protective door is fixedly connected to the outer surface of the rectangular column, a square plate is fixedly connected to the upper surface of the rectangular column, a horizontal sliding plate is fixedly connected to the outer surface of the rectangular plate, an arc groove is provided on the outer surface of the rectangular column close to the pressure block, a solid column pile is clamped on the inner surface of the arc groove, two square grooves are provided on the outer surface of the rectangular column away from the protective door, a single-hole plate is slidably connected to the inner surface of the square groove, a rectangular groove is provided between the two square grooves, a linkage column is slidably connected to the inner surface of the rectangular groove, a protrusion plate is slidably connected to the inner surface of the rectangular groove, and a screw rod is rotatably connected to the inner wall of the rectangular groove.

[0014] 3) Beneficial effects:

[0015] Compared with the existing technology, the steel structure protective door of the civil air defense project has the following beneficial effects:

[0016] 1. The utility model uses double push wheels to push the horizontal slide plates on both sides to slide towards each other, so that the horizontal slide plates on both sides respectively drive the pressure block and the fixing block to drive the protective door thereunder to slide towards each other. During the sliding process of the two, part of the inclined surface block slides into the pressure block, and the solid column pile outside the pressure block squeezes the inclined surface of the single-hole plate. After it is pressed into the pressure block, the single-hole plate is pushed out by the spring rod, so that the solid column pile is stuck by the plane of the inclined surface block, so that the protective door is automatically locked after it is automatically closed, thereby achieving the purpose of automatically locking the protective door after it is closed, and solving the problem of wasting time in locking the protective door after closing it in an emergency.

[0017] 2. The utility model drives the protruding block plate to descend through the screw groove of the screw rod during rotation, so that the protruding block plate drives the single-hole plate to descend through the linkage column, and then the single-hole plate drives the inclined surface block to slide into the pressure block and the fixing block, so that the closing column is no longer stuck. After that, the internal shaft is driven by an external power source to rotate in the opposite direction, so that the horizontal slide plate drives the protective door to slide outward, so that part of the protective door slides into the wall frame and the masonry structure to be hidden, thereby achieving the purpose of hiding the protective door when idle and solving the problem of excessive floor space occupied when the protective door is open and idle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the wall-connected frame structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the storage bin of the utility model;

[0020] Figure 3 This is a schematic diagram of the firmware block structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the pressing piece block of the utility model.

[0022] In the figure: protective door 1, wall frame 2, storage bin 3, inner shaft 4, double push wheels 5, horizontal slide plate 6, pressure block 7, column pile 8, closing column 9, inclined block 10, single hole plate 11, fastening block 12, spring wrapped rod 13, linkage column 14, protrusion plate 15, screw groove rod 16. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1-4 As shown, the utility model provides a technical solution: a protective door of a steel structure for civil air defense engineering, including a protective door 1, the protective door 1 is two square plates, the outer surfaces of the square plates are slidably connected to a wall frame 2, the upper surfaces of the square plates are fixedly connected to an inverted convex column, the outer surfaces of the convex columns are slidably connected to the wall frame 2, one of the square plates is fixedly connected to a pressing block 7 on its outer surface, and the other square plate is fixedly connected to a fixing block 12 on its outer surface. The protective door 1 is used to drive some devices to move by sliding itself and to fix some devices, and is also used to close the passage.

[0025] The outer surface of the protective door 1 is slidably connected to a wall frame 2. The wall frame 2 is two rectangular columns. The outer surfaces of the rectangular columns are provided with rectangular grooves. The protective door 1 is slidably connected to the inner surfaces of the rectangular grooves. The upper ends of the two rectangular columns are fixedly connected to rectangular columns. The lower surfaces of the rectangular columns are provided with inverted convex grooves. The inner surface of the convex grooves is slidably connected to the protective door 1. The wall frame 2 is used to provide a necessary working environment for the protective door 1.

[0026] A storage bin 3 is fixedly connected to the upper surface of the wall frame 2. The storage bin 3 is a rectangular tube. The wall frame 2 is fixedly connected to the lower surface of the rectangular tube. A circular hole is provided on the outer surface of the rectangular tube and penetrates to the inner wall of the rectangular tube. An inner shaft 4 is rotatably connected to the inner surface of the circular hole. A horizontal slide 6 is slidably connected to the inner surface of the rectangular tube. Two rectangular grooves are provided on the outer surface of the rectangular tube close to the fixing block 12 and penetrate to the inner wall of the rectangular tube. A horizontal slide 6 is slidably connected to the inner wall of the rectangular groove. The storage bin 3 is used to provide a necessary working environment for the inner shaft 4, the double push wheels 5 and the horizontal slide 6.

[0027] The inner surface of the storage bin 3 is rotatably connected to the inner shaft 4, and the outer circumferential surface of the inner shaft 4 is fixedly connected to a double push wheel 5, and the teeth of the double push wheel 5 are meshed with a transverse slide plate 6. The transverse slide plate 6 is two rectangular columns, and the outer surface of the rectangular columns is slidably connected to the storage bin 3, and the outer surface of the rectangular columns close to the inner shaft 4 is provided with teeth, and the teeth are meshed with double push wheels 5. A square key is fixedly connected to the outer surface of the rectangular columns, and the outer surface of the square key is slidably connected to the storage bin 3, and the outer surface of the upper square key is fixedly connected to a firmware block 12 on the side away from the upper rectangular column, and the outer surface of the lower square key is fixedly connected to a pressure block 7 on the side away from the lower rectangular column. The transverse slide plate 6 is used to drive the pressure block 7 and the firmware block 12 to slide during its own sliding process.

[0028] The outer surface of the horizontal slide plate 6 is slidably connected to the storage bin 3, and the outer surface of the horizontal slide plate 6 is fixedly connected to the pressure block 7, the pressure block 7 is a rectangular column, the outer surface of the rectangular column is fixedly connected to the protective door 1, the upper surface of the rectangular column is fixedly connected to the square plate, the outer surface of the rectangular plate is fixedly connected to the horizontal slide plate 6, an arc groove is provided on the outer surface of the rectangular column close to the fixing block 12, and a column pile 8 is fixedly connected to the inner surface of the arc groove, and two square grooves are provided on the outer surface of the rectangular column away from the protective door 1, a single-hole plate 11 is slidably connected to the inner surface of the square groove, and a ramp block 10 is slidably connected to the inner surface of the square groove. The pressure block 7 is used to provide a necessary working environment for some devices.

[0029] The inner arc surface of the pressure piece block 7 is fixedly connected to a fixed column pile 8, and the outer surface of the fixed column pile 8 away from the protective door 1 is fixedly connected to a closing column 9, and the outer surface of the pressure piece block 7 away from the closing column 9 is fixedly connected to the protective door 1, and the outer surface of the closing column 9 is clamped with a ramp block 10, and the outer surface of the ramp block 10 close to the protective door 1 is fixedly connected to a single-hole plate 11, and the outer surface of the single-hole plate 11 is slidably connected to the pressure piece block 7, and the outer surface of the single-hole plate 11 is slidably connected to a fixing block 12, and the fixing block 12 is a rectangular column, and the outer surface of the rectangular column is fixedly connected to the protective door 1, and the upper surface of the rectangular column is fixed A square plate is connected, a horizontal sliding plate 6 is fixedly connected to the outer surface of the rectangular plate, an arc groove is provided on the outer surface of the rectangular column close to the pressure block 7, a solid column pile 8 is clamped on the inner surface of the arc groove, two square grooves are provided on the outer surface of the rectangular column away from the protective door 1, a single-hole plate 11 is slidably connected to the inner surface of the square groove, a rectangular groove is provided between the two square grooves, a linkage column 14 is slidably connected to the inner surface of the rectangular groove, a protrusion plate 15 is slidably connected to the inner surface of the rectangular groove, a screw rod 16 is rotatably connected to the inner wall of the rectangular groove, and the firmware block 12 is used to provide a necessary working environment for some devices.

[0030] A fixed column pile 8 is clamped on the inner surface of the fixing block 12, a protective door 1 is fixedly connected to the outer surface of the fixing block 12 away from the closing column 9, a transverse slide plate 6 is fixedly connected to the outer surface of the fixing block 12 away from the closing column 9, a spring rod 13 is fixedly connected to the inner surface of the fixing block 12, a single-hole plate 11 is slidably connected to the outer circumference of the spring rod 13, a linkage column 14 is fixedly connected to the outer surface of the single-hole plate 11, the linkage column 14 is two rectangular columns, the outer surface of the rectangular column is fixedly connected to the single-hole plate 11, one end of the linkage column 14 is fixedly connected to the rectangular plate, and a protrusion plate 15 is clamped on the upper surface of the rectangular plate.

[0031] The outer surface of the linkage column 14 is slidably connected with the firmware block 12, and the outer surface of the linkage column 14 away from the protective door 1 is clamped with a protrusion plate 15, the protrusion plate 15 is a square block, the outer surface of the square block is provided with a threaded hole, the inner surface of the threaded hole is threadedly connected with a screw groove rod 16, the outer surface of the square block is slidably connected with the firmware block 12, the outer surface of the square block is provided with two rectangular plates, the lower surface of the rectangular plates is clamped with the linkage column 14, the outer surface of the rectangular plates is slidably connected with the firmware block 12, the outer surface of the protrusion plate 15 is slidably connected with the firmware block 12, the inner surface of the protrusion plate 15 is threadedly connected with the screw groove rod 16, and the screw groove rod 16 is rotatably connected to the inner wall of the firmware block 12 at one end close to the protective door 1.

[0032] Working principle: when in use, the wall connecting frame 2 is fixed in the masonry structure, and suitable sliding grooves are opened on both sides of the masonry structure according to the height of the protective door 1 and the storage bin 3. When the protective doors 1 on both sides need to be closed, the internal shaft 4 is driven to rotate by an external power source. During the rotation of the internal shaft 4, the double push wheels 5 outside it are driven to rotate, so that the double push wheels 5 push the horizontal slide plates 6 on both sides to slide in opposite directions, so that the horizontal slide plates 6 on both sides respectively drive the pressure block 7 and the fixing block 12 to drive the protective door 1 thereunder to slide in opposite directions. During the sliding process of the two, part of the inclined surface block 10 slides into the pressure block 7, and the fixed column pile 8 outside the pressure block 7 squeezes the inclined surface of the single-hole plate 11. After it is pressed into the pressure block 7, the single-hole plate 11 The spring-wrapped rod 13 is pushed out, so that the column pile 8 is stuck by the plane of the inclined block 10, so that it is automatically locked after the protective door 1 is automatically closed. When the protective door 1 needs to be opened, the screw groove rod 16 is driven to rotate by an external power source. During the rotation of the screw groove rod 16, the thread groove of the screw groove rod 16 drives the protrusion plate 15 to descend, so that the protrusion plate 15 drives the single-hole plate 11 to descend through the linkage column 14, and then the single-hole plate 11 drives the inclined block 10 to slide into the pressure block 7 and the fixing block 12, so that it no longer blocks the closing column 9, and then the internal shaft 4 is driven by the external power source to rotate in the opposite direction, so that the horizontal slide plate 6 drives the protective door 1 to slide outward, so that part of the protective door 1 slides into the wall frame 2 and the masonry structure to be hidden.

Claims

1. A protective door for a steel structure of a civil air defense project, comprising a protective door (1), characterized in that: The outer surface of the protective door (1) is slidably connected to a wall-connecting frame (2), the upper surface of the wall-connecting frame (2) is fixedly connected to a storage bin (3), the inner surface of the storage bin (3) is rotatably connected to a through shaft (4), the outer circumferential surface of the through shaft (4) is fixedly connected to a double push wheel (5), the teeth of the double push wheel (5) are meshed with a transverse slide plate (6), the outer surface of the transverse slide plate (6) is slidably connected to the storage bin (3), the outer surface of the transverse slide plate (6) is fixedly connected to a pressing block (7), and the pressing block (7) The inner arc surface is fixedly connected with a fixed column pile (8), the outer surface of the fixed column pile (8) away from the protective door (1) is fixedly connected with a closing column (9), the outer surface of the pressing piece block (7) away from the closing column (9) is fixedly connected with the protective door (1), the outer surface of the closing column (9) is clamped with an inclined surface block (10), the outer surface of the inclined surface block (10) close to the protective door (1) is fixedly connected with a single hole plate (11), the outer surface of the single hole plate (11) is slidably connected with the pressing piece block (7), and the single hole The outer surface of the plate (11) is slidably connected to a fixing block (12), the inner surface of the fixing block (12) is clamped with a fixing column pile (8), the outer surface of the fixing block (12) away from the closing column (9) is fixedly connected to a protective door (1), the outer surface of the fixing block (12) away from the closing column (9) is fixedly connected to a transverse sliding plate (6), the inner surface of the fixing block (12) is fixedly connected to a spring rod (13), the outer circumferential surface of the spring rod (13) is slidably connected to a single hole plate (11), and the single hole plate (11) is fixedly connected to the outer surface of the fixing block (12). A linkage column (14) is fixedly connected to the outer surface of the orifice plate (11), a fixing block (12) is slidably connected to the outer surface of the linkage column (14), a protrusion plate (15) is clamped on the outer surface of the linkage column (14) away from the protective door (1), the outer surface of the protrusion plate (15) is slidably connected to the fixing block (12), a screw groove rod (16) is threadedly connected to the inner surface of the protrusion plate (15), and the end of the screw groove rod (16) close to the protective door (1) is rotatably connected to the inner wall of the fixing block (12).

2. The steel structure protective door for civil air defense engineering according to claim 1, characterized in that: The protective door (1) is composed of two square plates, the outer surfaces of which are slidably connected to a wall connection frame (2), the upper surfaces of which are fixedly connected to an inverted convex column, the outer surfaces of which are slidably connected to the wall connection frame (2), one of which is fixedly connected to a pressing piece block (7) on its outer surface, and the other is fixedly connected to a fixing piece block (12) on its outer surface.

3. The steel structure protective door for civil air defense engineering according to claim 1 is characterized by: The wall connecting frame (2) is composed of two rectangular columns, the outer surfaces of the rectangular columns are provided with rectangular grooves, the inner surfaces of the rectangular grooves are slidably connected to the protective door (1), the upper ends of the two rectangular columns are fixedly connected to the rectangular columns, the lower surfaces of the rectangular columns are provided with inverted convex grooves, and the inner surfaces of the convex grooves are slidably connected to the protective door (1).

4. The steel structure protective door for civil air defense engineering according to claim 1 is characterized by: The storage bin (3) is a rectangular tube, the lower surface of which is fixedly connected to a wall connection frame (2), the outer surface of which is provided with a circular hole penetrating to the inner wall of the rectangular tube, the inner surface of which is rotatably connected to an inner shaft (4), the inner surface of which is slidably connected to a horizontal slide plate (6), the outer surface of which is close to the fixing block (12) is provided with two rectangular grooves penetrating to the inner wall of the rectangular tube, the inner wall of which is slidably connected to a horizontal slide plate (6).

5. The steel structure protective door for civil air defense engineering according to claim 1 is characterized by: The transverse sliding plate (6) is two rectangular columns, the outer surface of the rectangular column is slidably connected to the storage bin (3), the outer surface of the rectangular column close to the inner shaft (4) is provided with teeth, the teeth are meshed with double push wheels (5), the outer surface of the rectangular column is fixedly connected to a square key, the outer surface of the square key is slidably connected to the storage bin (3), the outer surface of the upper square key away from the upper rectangular column is fixedly connected to a fixing block (12), and the outer surface of the lower square key away from the lower rectangular column is fixedly connected to a pressing block (7).

6. The steel structure protective door for civil air defense engineering according to claim 1, characterized in that: The pressing piece block (7) is a rectangular column, the outer surface of the rectangular column is fixedly connected to the protective door (1), the upper surface of the rectangular column is fixedly connected to a square plate, the outer surface of the rectangular plate is fixedly connected to a horizontal sliding plate (6), the outer surface of the rectangular column close to the fixing block (12) is provided with an arc groove, the inner surface of the arc groove is fixedly connected to a column pile (8), the outer surface of the rectangular column away from the protective door (1) is provided with two square grooves, the inner surface of the square groove is slidably connected to a single hole plate (11), and the inner surface of the square groove is slidably connected to a slope block (10).

7. The steel structure protective door for civil air defense engineering according to claim 1 is characterized by: The fixing block (12) is a rectangular column, the outer surface of which is fixedly connected to the protective door (1), the upper surface of which is fixedly connected to a square plate, the outer surface of which is fixedly connected to a horizontal sliding plate (6), the outer surface of which is close to the pressing piece block (7) is provided with an arc groove, the inner surface of which is clamped with a column pile (8), the outer surface of which is far from the protective door (1) is provided with two square grooves, the inner surface of which is slidably connected to a single-hole plate (11), a rectangular groove is provided between the two square grooves, the inner surface of which is slidably connected to a linkage column (14), the inner surface of which is slidably connected to a convex block plate (15), and the inner wall of which is rotatably connected to a screw groove rod (16).