Welding equipment with limiting structure for human defense door leaf steel reinforcement framework

Abstract

The application discloses a welding equipment with a limiting structure for a human defense door leaf steel bar framework, relates to the technical field of welding, and aims at the problem that the prior art cannot adapt to the steel bar diameter tolerance and height difference, and the partial pressing points are easily virtually pressed or over-pressed, which leads to the decline of the flatness of the steel bar mesh after welding and the poor welding effect, and proposes the following scheme, which comprises a bearing base and a portal frame, a plurality of support plates are arranged on the top outer wall of the bearing base in the length direction, sliding grooves are formed in the upper outer walls of the plurality of support plates, limiting mechanisms are arranged on the plurality of support plates, and the limiting mechanism comprises a sliding seat slidingly arranged in the sliding groove and two connecting blocks connected to the outer walls on the two sides of the sliding seat through bolts. The application can self-centering support and limit the steel bar, and can self-adaptively press the steel bar in cooperation with the limiting mechanism during welding, so that the steel bar is prevented from being warped during welding, and the welding effect is improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding device with a limiting structure for the steel reinforcement frame of a civil defense door. Background Technology

[0002] Welding, also known as fusion welding, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. There are many energy sources for modern welding, including gas flame, electric arc, laser, electron beam, friction and ultrasound.

[0003] Civil defense doors are specialized protective facilities at the entrances and exits of civil defense projects. Belonging to civil defense equipment, they are primarily used to prevent and mitigate harm from air raids, disasters, and other hazards. Their core functions are protection and airtightness. Some types also possess combined capabilities such as fire resistance and electromagnetic pulse protection. They are classified into two types based on material: concrete and steel. Protection levels are classified as Level 5 and Level 6. Standard dimensions are 800-2000 mm in width and 2000 mm in height. They are widely used in underground shopping malls, hospitals, parking lots, and other locations. The door consists of a frame and a door leaf, equipped with sealing strips, moisture-proof components, and other protective devices. The main body of the door leaf is usually made of reinforced concrete, with an internal steel reinforcement frame as the load-bearing structure. During the manufacturing process of the steel reinforcement frame, longitudinal and transverse steel bars are arranged at designed intervals and welded at the intersections to form a steel mesh. For civil defense door leaves, typically two layers of steel mesh are connected by tie bars to form the overall frame. The welding precision of each layer of steel mesh directly affects the dimensional stability of the final frame and the structural strength of the door leaf.

[0004] In the existing technology for welding steel reinforcement cages for air-raid shelter doors, the intersections of the steel reinforcements are heated and cause local expansion. If the clamping constraint is insufficient, the steel reinforcements are prone to warping or displacement. The clamping structure of existing steel reinforcement cage welding equipment for air-raid shelter doors is mostly an integral pressure plate, which cannot adapt to the diameter tolerance and height difference of the steel reinforcements. It is easy to have some pressure points that are not properly clamped or some pressure points that are over-clamped, resulting in a decrease in the flatness of the steel mesh after welding and poor welding effect. Summary of the Invention

[0005] This invention provides a welding device with a limiting structure for the steel reinforcement skeleton of civil defense doors. It solves the problem that the pressing structure of existing steel reinforcement skeleton welding devices for civil defense doors is mostly an integral pressure plate, which cannot adapt to the diameter tolerance and height difference of the steel bars. It is easy to have some pressing points with insufficient pressing and some pressing points with excessive pressing, resulting in a decrease in the flatness of the steel mesh after welding and poor welding effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A welding device with a limiting structure for the steel reinforcement frame of a civil defense door includes a load-bearing base and a gantry frame. The load-bearing base has several support plates along its length on its top outer wall, and each support plate has a sliding track on its upper outer wall. Each support plate has a limiting mechanism, which includes a sliding seat slidably installed in the track, two connecting blocks bolted to the outer walls of the sliding seats on both sides, two transverse positioning blocks with "V"-shaped positioning grooves on their top outer walls, two longitudinal positioning plates with V-shaped grooves on their top outer walls, and four electromagnets. An upper linear module is bolted to the top outer wall of the gantry frame, and the upper linear module has an installation mechanism. The installation mechanism includes components bolted to the top outer wall of the upper linear module's slider. The assembly includes a connecting plate and a mounting block welded to one side of the outer wall of the connecting plate. The mounting block is equipped with a follow-up adjustment component, which includes two lifting cylinders respectively bolted to the top outer wall of the mounting block, a lifting plate bolted to the bottom of the piston rods of the two lifting cylinders, and a laser welding head module bolted to the top outer wall of the lifting plate. The bottom of the lifting plate is equipped with a mounting frame, and floating clamping components are provided on the four corner outer walls of the bottom of the mounting frame. The floating clamping components include a floating sleeve bolted to the bottom outer wall of the mounting frame, a compression spring sleeved on the upper inner wall of the floating sleeve, a slip ring slidably mounted on the lower inner wall of the floating sleeve, a pressure rod penetrating and bolted to the outer wall of the slip ring, and a floating pressure block bolted to the bottom outer wall of the pressure rod.

[0008] Preferably, the four corners of the bottom outer wall of the bearing base are provided with height-adjustable anti-vibration pads, and several support plates are respectively connected to the top outer wall of the bearing base by bolts.

[0009] Preferably, fastening bolts are screwed onto the outer walls of both connecting blocks, and the two fastening bolts are fastened to the support plate respectively. The two transverse positioning blocks are respectively bolted to the bottom outer walls of the two connecting blocks, and the two longitudinal positioning plates are respectively bolted to the outer walls on both sides of the two transverse positioning blocks. The four electromagnets are respectively bolted to one side of the two transverse positioning blocks and one side of the outer walls of the two longitudinal positioning plates.

[0010] Preferably, the lower linear modules are bolted to the outer walls of the top two sides of the bearing base, and the bottom of the gantry is bolted to the top outer walls of the two lower linear module sliders.

[0011] Preferably, two reinforcing plates are bolted to the inner wall of the mounting block, and a fixing plate is welded to the outer wall of the middle part of one side of the mounting block. A slider pair is bolted to the outer wall of the top of the fixing plate.

[0012] Preferably, a slide rail is bolted to the inner wall of the top of the gantry frame, and the slider pair is slidably mounted on the outer wall of the slide rail.

[0013] Preferably, the middle outer wall of the lifting plate has an installation opening, and the lower part of the laser welding head module is fitted into the installation opening.

[0014] Preferably, the mounting bracket is bolted to the outer wall of the bottom of the lifting plate, and a through hole concentric with the mounting opening is opened on the outer wall at the center of the mounting bracket.

[0015] Preferably, the two ends of the compression spring abut against the inner wall of the top of the floating sleeve and the outer wall of the top of the slip ring, respectively. A limit ring is connected to the outer wall of the bottom end of the floating sleeve by bolts, and the pressure rod is slidably installed in the limit ring. The floating pressure block includes a horizontal plate and two extrusion blocks with V-shaped fixing grooves on the bottom outer walls.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. By setting a slide rail on the support plate, the sliding seat can move along the slide rail and be locked by the fastening bolts on the connecting block. The connecting blocks on the left and right sides are respectively fixed to the transverse positioning blocks, so that the positions of the two transverse positioning blocks are kept symmetrical. The longitudinal positioning plate is fixed on both sides of the transverse positioning block, forming an orthogonal grid with the transverse positioning block. When the steel bar is placed, the longitudinal steel bar is embedded in the V-shaped groove of the longitudinal positioning plate, and the two ends of the transverse steel bar are respectively embedded in the V-shaped groove of the two transverse positioning blocks. The intersection of the steel bars is automatically located at the center of the grid.

[0018] 2. Four independently set floating clamping components are used, which are arranged at the four corners of the mounting frame to clamp the longitudinal and transverse reinforcing bars on both sides of the intersection of the reinforcing bars. In each floating clamping component, the pressure rod is slidably installed in the floating sleeve, and the compression spring abuts against the slip ring and the inner wall of the top of the floating sleeve, so that the floating pressure block can independently adapt to the height difference of the reinforcing bars. During welding, the four floating pressure blocks simultaneously apply downward clamping force to the reinforcing bars on both sides of the transverse positioning block and the longitudinal positioning plate, forming symmetrical constraints and limiting the warping and displacement of the reinforcing bars under the action of welding heat. At the same time, the lifting cylinder remains in the downward pressing state after welding, so that the clamping force continues until the weld cools down, reducing the deformation caused by the cooling shrinkage stage.

[0019] In summary, the present invention can provide self-centering support and limit the position of the reinforcing bars, and can also cooperate with the limiting mechanism to adaptively compress the reinforcing bars during welding, thereby preventing the reinforcing bars from warping during welding and improving the welding effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall main structure of a welding device with a limiting structure for the steel reinforcement frame of a civil defense door leaf proposed in this invention.

[0021] Figure 2 This is a schematic diagram of the overall bottom view of a welding device with a limiting structure for the steel reinforcement frame of a civil defense door leaf proposed in this invention.

[0022] Figure 3 The present invention proposes Figure 2 Enlarged structural diagram at point A in the middle.

[0023] Figure 4 This is a schematic diagram of the main structure of the limiting mechanism of a welding device with a limiting structure for a steel reinforcement frame of a civil defense door leaf, as proposed in this invention.

[0024] Figure 5 This is a schematic diagram of the main structure of the installation mechanism of a welding device with a limiting structure for the steel reinforcement frame of a civil defense door leaf, as proposed in this invention.

[0025] Figure 6 This is a schematic diagram of the main structure of the follow-up adjustment component of a welding equipment with a limiting structure for the steel reinforcement skeleton of a civil defense door leaf, as proposed in this invention.

[0026] Figure 7 This is a schematic diagram of the mounting frame structure of a welding equipment with a limiting structure for the steel reinforcement skeleton of a civil defense door leaf proposed in this invention.

[0027] Figure 8 This is a schematic cross-sectional view of the floating clamping component of a welding device with a limiting structure for the steel reinforcement skeleton of a civil defense door leaf, as proposed in this invention.

[0028] In the diagram: 1. Bearing base; 2. Support plate; 3. Limiting mechanism; 301. Sliding seat; 302. Connecting block; 303. Lateral positioning block; 304. Longitudinal positioning plate; 305. Electromagnet; 4. Lower linear module; 5. Gantry frame; 6. Upper linear module; 7. Installation mechanism; 701. Connecting plate; 702. Mounting block; 703. Fixing plate; 704. Slider pair; 8. Slide rail; 9. Follow-up adjustment component; 901. Lifting cylinder; 902. Lifting plate; 903. Laser welding head module; 10. Mounting bracket; 11. Floating clamping component; 111. Floating sleeve; 112. Compression spring; 113. Slip ring; 114. Pressure rod; 115. Limiting ring; 116. Floating pressure block. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Example 1, referring to Figure 1-2A welding device with a limiting structure for the steel reinforcement frame of a civil defense door includes a bearing base 1 and a gantry frame 5. The bearing base 1 is provided with height-adjustable anti-vibration pads on the outer walls of the four corners at the bottom. Several support plates 2 are respectively connected to the outer wall of the top of the bearing base 1 by bolts. Several support plates 2 are provided along the length direction on the outer wall of the top of the bearing base 1. Slides are opened on the upper outer walls of the several support plates 2.

[0031] Reference Figure 1-2 and Figure 4 Each of the support plates 2 is equipped with a limiting mechanism 3. The limiting mechanism 3 includes a sliding seat 301 slidably installed in the slide rail, two connecting blocks 302 respectively bolted to the outer walls of the two sides of the sliding seat 301, two transverse positioning blocks 303 with "V" shaped positioning grooves on their top outer walls, two longitudinal positioning plates 304 with V-shaped grooves on their top outer walls, and four electromagnets 305. Fastening bolts are screwed onto the outer walls of the two connecting blocks 302, and the two fastening bolts form a fastening fit with the support plate 2. The two transverse positioning blocks 303 are respectively bolted to the bottom outer walls of the two connecting blocks 302. The two longitudinal positioning plates 304 are respectively bolted to the outer walls of the two transverse positioning blocks 303 on both sides, and the two longitudinal positioning plates 304 form a sliding fit with the support plate 2. The support plate 2 supports the longitudinal positioning plates 304. The four electromagnets 305 are respectively bolted to one side of the two transverse positioning blocks 303 and one side of the outer wall of the two longitudinal positioning plates 304 on one side.

[0032] Example 2, refer to Figure 1-3 and Figure 5 A welding device with a limiting structure for the steel reinforcement frame of a civil defense door leaf includes two lower linear modules 4, which are respectively bolted to the outer walls of the top two sides of the bearing base 1. The bottom end of the gantry frame 5 is respectively bolted to the outer wall of the top of the sliders of the two lower linear modules 4. An upper linear module 6 is bolted to the outer wall of the top of the gantry frame 5. An installation mechanism 7 is provided on the upper linear module 6. The installation mechanism 7 includes a connecting plate 701 bolted to the outer wall of the top of the slider of the upper linear module 6 and an installation block 702 welded to the outer wall of one side of the connecting plate 701. Two reinforcing plates are bolted to the inner wall of the installation block 702. A fixing plate 703 is welded to the outer wall of the middle part of one side of the installation block 702. A slider pair 704 is bolted to the outer wall of the top of the fixing plate 703. A slide rail 8 is bolted to the inner wall of the top of the gantry frame 5. The slider pair 704 is slidably installed on the outer wall of the slide rail 8 to improve the stability of the installation block 702 when it moves.

[0033] Example 3, referring to Figure 1-3 and Figure 6A welding device with a limiting structure for the steel reinforcement frame of a civil defense door leaf also includes a follow-up adjustment component 9. The follow-up adjustment component 9 includes two lifting cylinders 901 that are respectively bolted to the top outer wall of the mounting block 702, a lifting plate 902 that is bolted to the bottom end of the piston rod of the two lifting cylinders 901, and a laser welding head module 903 that is bolted to the top outer wall of the lifting plate 902. An installation port is opened on the middle outer wall of the lifting plate 902, and the lower part of the laser welding head module 903 is fitted into the installation port.

[0034] Reference Figure 1-3 and Figure 7 It includes a mounting bracket 10 that is bolted to the bottom outer wall of the lifting plate 902. The mounting bracket 10 has a through hole concentric with the mounting opening on its outer wall at the center, through which the laser of the laser welding head module 903 passes to perform laser welding on the joints of the transverse and longitudinal steel bars.

[0035] Reference Figure 1-3 and Figure 8 The system includes four floating clamping assemblies 11. Each floating clamping assembly 11 includes a floating sleeve 111 bolted to the bottom outer wall of the mounting bracket 10, a compression spring 112 sleeved on the upper inner wall of the floating sleeve 111, a slip ring 113 slidably mounted on the lower inner wall of the floating sleeve 111, a pressure rod 114 threaded through and bolted to the outer wall of the slip ring 113, and a floating pressure block 116 bolted to the bottom outer wall of the pressure rod 114. The two ends of the compression spring 112 abut against the top inner wall of the floating sleeve 111 and the top outer wall of the slip ring 113, respectively. A limit ring 115 is bolted to the bottom outer wall of the floating sleeve 111, and the pressure rod 114 is slidably mounted inside the limit ring 115. The floating pressure block 116 includes a horizontal plate and two extrusion blocks with V-shaped fixing grooves on their bottom outer walls. During welding, the two extrusion blocks on the floating pressure block 116 span across the horizontal positioning block 303 or the longitudinal positioning plate 304.

[0036] According to the specifications of the steel reinforcement frame of the air-raid shelter door, the sliding seat 301 is moved along the slide rail on the support plate 2 and adjusted to the preset position. Then, the fastening bolts on the connecting block 302 are tightened to lock the sliding seat 301. When the sliding seat 301 moves, the two transverse positioning blocks 303 are moved synchronously through the connecting block 302 to ensure that the positions of the transverse positioning blocks 303 on the left and right sides are symmetrical. The longitudinal steel bars are placed into the V-shaped grooves at the top of the longitudinal positioning plate 304 in sequence, and the two ends of the transverse steel bars are placed into the V-shaped grooves of the transverse positioning blocks 303 on the left and right sides respectively. The V-shaped grooves on the longitudinal positioning plate 304 and the V-shaped grooves on the transverse positioning blocks 303 are perpendicular to each other, forming a grid-like positioning structure. Each steel bar intersection point is automatically located in the center of the corresponding grid. The electromagnet 305 is energized at the center position. After energization, the magnetic force generated by the electromagnet 305 is transmitted to the V-groove working surface through the transverse positioning block 303 and the longitudinal positioning plate 304, attracting and fixing the longitudinal and transverse steel bars placed in the V-groove to prevent displacement of the steel bars during loading and subsequent clamping. The lower linear module 4 drives the gantry 5 to move along the length of the bearing base 1, and the upper linear module 6 drives the installation mechanism 7 to move along the crossbeam of the gantry, so that the laser welding head module 903 is aligned directly above the first steel bar intersection point. The cooperation between the slider pair 704 and the slide rail 8 provides guidance for the installation mechanism 7 to ensure smooth movement. The piston rod of the lifting cylinder 901 extends, pushing the lifting plate 902, the mounting frame 10, and the four... The floating clamping assembly 11 descends as a whole, and the four floating clamping blocks 116 first contact the surface of the reinforcing bars. As the lifting plate 902 continues to descend, the pressure rod 114 slides upward within the floating sleeve 111, compressing the compression spring 112 and generating a downward clamping force. Since each floating clamping assembly 11 is independently set, the compression amount of the compression spring 112 can be automatically adjusted according to the height difference of the reinforcing bars at each contact point, so that all four floating clamping blocks 116 can fit against the surface of the reinforcing bars and apply clamping force. The laser welding head module 903 emits a laser beam, which passes through the mounting port of the lifting plate 902 and the through hole in the center of the mounting bracket 10, and irradiates the intersection of the reinforcing bars vertically. The laser energy melts the contact surface of the reinforcing bars to form a weld. During the welding process, the four floating clamping blocks 116... The moving pressure block 116 remains in a compressed state, restricting the displacement of the reinforcing bar due to thermal expansion. After welding is completed, the lifting cylinder 901 remains in a downward state, and the four floating pressure blocks 116 continue to press the weld area. After the weld cools to the set temperature, the piston rod of the lifting cylinder 901 retracts, driving the lifting plate 902 and the floating pressure assembly 11 to rise. The floating pressure block 116 detaches from the surface of the reinforcing bar. The lower straight module 4 and the upper straight module 6 drive the gantry 5 to move to the next reinforcing bar intersection. The above pressing, welding, and pressure holding steps are repeated until all intersections are welded. After all intersections are welded, the electromagnet 305 is de-energized, releasing the attraction to the reinforcing bar. The operator removes the welded reinforcing bar mesh from the V-groove.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A welding device with a limiting structure for the steel reinforcement frame of a civil defense door leaf, comprising a bearing base (1) and a gantry frame (5), characterized in that, The bearing base (1) has several support plates (2) along its length on the top outer wall, and each of the support plates (2) has a slide rail on its upper outer wall. Each of the support plates (2) is provided with a limiting mechanism (3). The limiting mechanism (3) includes a sliding seat (301) slidably installed in the slide rail, two connecting blocks (302) respectively connected to the outer walls of the two sides of the sliding seat (301) by bolts, two transverse positioning blocks (303) with "V" shaped positioning grooves on the top outer walls, two longitudinal positioning plates (304) with V-shaped grooves on the top outer walls, and four electromagnets (305). The upper linear module (6) is bolted to the top outer wall of the gantry frame (5), and the upper linear module (6) is provided with an installation mechanism (7). The installation mechanism (7) includes a connecting plate (701) bolted to the top outer wall of the upper linear module (6) slider and an installation block (702) welded to the outer wall of one side of the connecting plate (701). The mounting block (702) is provided with a follow-up adjustment component (9), which includes two lifting cylinders (901) that are respectively bolted to the top outer wall of the mounting block (702), a lifting plate (902) that is bolted to the bottom end of the piston rod of the two lifting cylinders (901), and a laser welding head module (903) that is bolted to the top outer wall of the lifting plate (902). The bottom of the lifting plate (902) is provided with a mounting bracket (10); The mounting bracket (10) is provided with floating clamping components (11) on the outer walls of the four corners at the bottom. The floating clamping components (11) include a floating sleeve (111) connected to the outer wall at the bottom of the mounting bracket (10) by bolts, a compression spring (112) sleeved on the inner wall of the upper part of the floating sleeve (111), a slip ring (113) slidably installed on the inner wall of the lower part of the floating sleeve (111), a pressure rod (114) passing through and screwed to the outer wall of the slip ring (113), and a floating pressure block (116) connected to the outer wall at the bottom end of the pressure rod (114) by bolts.

2. The welding equipment with a limiting structure for the steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that, The bearing base (1) is provided with height-adjustable anti-vibration pads on the four corners of the bottom outer wall, and several support plates (2) are respectively connected to the top outer wall of the bearing base (1) by bolts.

3. The welding equipment with a limiting structure for the steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that, Two connecting blocks (302) are screwed with fastening bolts on their outer walls, and the two fastening bolts are fastened to the support plate (2). Two transverse positioning blocks (303) are bolted to the bottom outer walls of the two connecting blocks (302), and two longitudinal positioning plates (304) are bolted to the outer walls of the two transverse positioning blocks (303) on both sides. Four electromagnets (305) are bolted to the outer walls of the two transverse positioning blocks (303) on one side and the two longitudinal positioning plates (304) on one side.

4. The welding equipment with a limiting structure for the steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that, The top two sides of the bearing base (1) are each connected to a lower linear module (4) by bolts, and the bottom of the gantry (5) is respectively connected to the top outer wall of the slider of the two lower linear modules (4) by bolts.

5. The welding equipment with a limiting structure for the steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that, The inner wall of the mounting block (702) is connected to two reinforcing plates by bolts, and a fixing plate (703) is welded to the outer wall of the middle part of one side of the mounting block (702). A slider pair (704) is connected to the top outer wall of the fixing plate (703) by bolts.

6. The welding equipment with a limiting structure for the steel reinforcement frame of a civil defense door leaf according to claim 5, characterized in that, The gantry frame (5) has a slide rail (8) connected to the inner wall of the top by bolts, and the slider pair (704) is slidably installed on the outer wall of the slide rail (8).

7. The welding equipment with a limiting structure for the steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that, The lifting plate (902) has an installation opening on its outer wall in the middle, and the lower part of the laser welding head module (903) is fitted into the installation opening.

8. The welding equipment with a limiting structure for the steel reinforcement frame of a civil defense door leaf according to claim 7, characterized in that, The mounting bracket (10) is bolted to the bottom outer wall of the lifting plate (902), and a through hole concentric with the mounting opening is opened on the outer wall at the center of the mounting bracket (10).

9. The welding equipment with a limiting structure for the steel reinforcement frame of a civil defense door leaf according to claim 1, characterized in that, The compression spring (112) has its two ends abutting against the top inner wall of the floating sleeve (111) and the top outer wall of the slip ring (113), respectively. A limit ring (115) is bolted to the bottom outer wall of the floating sleeve (111), and the pressure rod (114) is slidably installed in the limit ring (115). The floating pressure block (116) includes a horizontal plate and two extrusion blocks with V-shaped fixing grooves on their bottom outer walls.

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