Ultra-high strength protective door leaf and its manufacturing method

Abstract

The present invention discloses an ultra-high-strength protective door leaf and a manufacturing method thereof. The ultra-high-strength protective door leaf includes a grille layer, a first panel, a second panel, an explosion-proof coating, a filling component and a frame. The grille layer is a grid-shaped component formed by the cross-connection of a plurality of strip-shaped components. The filling component is arranged in the grid of the grille layer. The strip-shaped components of the grille layer, the first panel and the second panel are all coated with the explosion-proof coating. The first panel is connected to one side of the grille layer, the second panel is connected to the other side of the grille layer, and the grille layer is embedded in the frame. The manufacturing method is the steps of manufacturing the above-mentioned ultra-high-strength protective door leaf. The structure of the ultra-high-strength protective door leaf of the present invention is simple, the manufacturing cost is low, and it is easy to manufacture and process. Moreover, it can meet the requirements of lightweight and strong explosion resistance of the protective door, and has strong feasibility.

Description

Technical Field

[0001] The present invention relates to the technical field of protective engineering, and particularly to a super-high-strength protective door leaf and a manufacturing method thereof. Background Art

[0002] The protective door is the most important protective equipment at the entrances and exits of various protective engineering projects, and is widely used in the protective engineering fields such as national civil air defense and military tunnel cavern projects.

[0003] The existing protective door materials are relatively single, mainly composed of reinforced concrete and ordinary steel. These two materials respectively have defects such as heavy door body structure, low processing accuracy, unattractive appearance, poor anti-corrosion performance, and high maintenance costs. However, affected by economic conditions and weak protection awareness, and coupled with the backward processing technology and detection means of protective equipment, it is very difficult for new materials to be applied in protective equipment. Although various high-strength alloy materials and composite materials have excellent performance, they cannot find their proper positions in the field of protective equipment. With the rapid development of science and technology, at present, many units have studied the application of new materials in protective doors, such as polymers impregnated with organic monomers, high-strength steel pipe concrete, and steel fiber-reinforced high-strength concrete. By using materials with greater toughness and composite structures, on the one hand, the compressive design strength of concrete is improved, and on the other hand, the weight of the protective door is greatly reduced. Moreover, a large number of new lightweight materials have emerged. However, in actual projects, due to a series of reasons such as the difficult construction of some materials, it is very difficult for new materials to be widely used in the production field of protective doors.

[0004] The structural forms of protective equipment currently used the most are still flat structures and arched structures. From the perspective of resisting static loads, the arched structure has a higher bearing capacity. However, from the perspective of resisting high-strength dynamic loads, a structure without energy dissipation measures cannot pass the high-strength dynamic load test.

[0005] Protective equipment belongs to the category of product research and development, and is inseparable from processing trial production and performance testing. However, protective equipment is different from general products. The reason is that the acting load is the weapon effect, which is an uncertain acting factor. The test methods using shock tubes or chemical explosions are different from the actual weapon effect, and it is normal for the results to have large differences. Protective equipment needs to form a comprehensive protective ability with other protective measures, and new technologies, new materials, new structural forms, and control methods should be adopted to improve product performance.

[0006] Chinese Patent Document CN108999540B discloses a novel anti-explosion protection door leaf structure and its manufacturing method, and Chinese Patent Document CN214449122U discloses a foam aluminum-steel composite explosion-proof door. New materials are used and new structures are designed in the above documents to improve the protection performance of the explosion-proof door. However, there are still defects in processing cost, processing technology and its explosion-proof performance. The process and structure are complex, there are many parts, the precision requirements are high, and the feasibility is poor. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an ultra-high-strength protection door leaf and its manufacturing method.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] An ultra-high-strength protection door leaf, comprising a grid layer, a first panel, a second panel, an explosion-proof coating, a filling component and a frame. The grid layer is a grid-shaped component formed by intersecting a plurality of strip-shaped components. The filling component is arranged in the grid of the grid layer. The strip-shaped components of the grid layer, the first panel and the second panel are all coated with the explosion-proof coating. The first panel is connected to one side of the grid layer, the second panel is connected to the other side of the grid layer, and the grid layer is embedded in the frame.

[0010] Further, the explosion-proof coating is a polyurea anti-explosion material.

[0011] Further, welding holes are provided on both the first panel and the second panel, and the welding holes are connected to the filling component.

[0012] Further, the grid layer includes a plurality of strip-shaped components arranged at equal intervals in a first direction and a plurality of strip-shaped components arranged at equal intervals in a second direction. The first direction is perpendicular to the second direction. A plurality of grooves arranged at equal intervals are provided on one side of each strip-shaped component. The strip-shaped components in the first direction are embedded in the grooves of the strip-shaped components in the second direction, and the strip-shaped components in the second direction are embedded in the grooves of the strip-shaped components in the first direction.

[0013] Further, each strip-shaped component and the frame form a triangular structure.

[0014] Further, the filling component includes an aluminum foam block and an L-shaped component. The L-shaped component is composed of a first section piece and a second section piece. The first section piece is perpendicularly connected to the second section piece. The first section piece of the L-shaped component is connected to the strip-shaped component of the grille layer. The second section piece of the L-shaped component is connected to the first panel or the second panel. A number of the L-shaped components are equidistantly arranged on one side of each strip-shaped component for connection to the first panel, and a number of L-shaped components are equidistantly arranged on the other side of each strip-shaped component for connection to the second panel.

[0015] Further, the filling component includes an explosion-proof component and an aluminum foam block. The explosion-proof component includes a first support piece, a second support piece, a first folding piece, and a second folding piece. The first support piece and the second support piece are parallel. The first folding piece and the second folding piece are symmetrically arranged between the first support piece and the second support piece. The folding lines of the first folding piece and the second folding piece are both parallel to the first support piece. One end of the first folding piece parallel to the folding line and one end of the second folding piece parallel to the folding line are both connected to the bottom surface of the first support piece. The other end of the first folding piece parallel to the folding line and the other end of the second folding piece parallel to the folding line are both connected to the top surface of the second support piece. The space formed by the first support piece, the second support piece, the first folding piece, and the second folding piece is filled with the aluminum foam block.

[0016] Further, the first support piece is connected to the first panel, the second support piece is connected to the second panel. The four sides of the first panel are all in contact with the upper ends of the strip-shaped components in the grille layer. The four sides of the second panel are all in contact with the lower ends of the strip-shaped components in the grille layer. The outer sides of the folding lines of the first folding piece and the second folding piece are not in contact with the middle parts of the strip-shaped components in the grille layer. The area surrounded by the second folding piece, the first support piece, the second support piece, and the strip-shaped component is the deformation space of the second folding piece.

[0017] The present invention also provides a method for manufacturing the door leaf of the ultra-high-strength protection door described in any of the above paragraphs, which includes the following steps:

[0018] S01. Assemble the strip-shaped components into a grid assembly, weld and fix the intersections of the strip-shaped components to form the grille layer 1;

[0019] S02. Use a spray gun to trim the ends of the strip-shaped components, embed the grille layer in the frame, and weld and fix the connection between the strip-shaped components and the frame;

[0020] S03. Fill the filling component into the grid of the grille layer;

[0021] S04. Use a rope for positioning and fix the filling component on the strip-shaped components;

[0022] S05. Spray the explosion-proof coating on the strip-shaped component;

[0023] S06. Drill welding holes in the first panel and the second panel;

[0024] S07. Take measures to cover the welding holes, and spray the explosion-proof coating on both sides of the first panel and the second panel;

[0025] S08. Fix the first panel and the second panel on both sides of the grille layer respectively, align the welding holes with the filling components, weld and fix the edges of the first panel and the second panel with the frame, and further weld the welding holes with the filling components at the welding holes. The manufacturing of the ultra-high-strength protection door leaf is completed.

[0026] Further, the spraying in S05 and / or S07 includes the following steps:

[0027] S1. Substrate treatment:

[0028] Sandblasting and rust removal: The metal substrate is sandblasted and the rust and oil stains on the surface are cleaned. The sandblasting reaches the Sa2.5 standard. The special parts need to be polished and chamfered with an angle grinder, and the protrusions are polished flat. The special parts include welds and internal and external corners, and the protrusions include welding slag and burrs;

[0029] Cleaning: Clean the rust slag with anhydrous and oil-free compressed air or a vacuum cleaner;

[0030] Substrate treatment acceptance: After the substrate treatment is completed, the next process can be carried out only after passing the inspection;

[0031] S2. Protection and shielding:

[0032] According to the design requirements, spray the anti-explosion polyurea material on the door leaf and the door frame, and shield the parts that do not need to be sprayed with transparent tape or masking tape or plastic protective tape;

[0033] Protection and shielding acceptance: Confirm that the protection and shielding are in place to ensure that the parts to be constructed are sprayed;

[0034] S3. Equipment inspection and trial spraying:

[0035] Check the equipment before construction to judge whether the main machine, spray gun and auxiliary equipment can work normally;

[0036] Parameter setting, set the pipeline pressure and heating temperature, and start the pipeline heating 30 minutes in advance;

[0037] Before spraying, the spraying material must be fully stirred for 30 minutes until the color is uniform, without floating color, blooming, and no dead precipitation;

[0038] Test spraying is carried out to observe whether the spray coating is normal. The test spraying sample is a PVC plate coated with a release agent, with a coating thickness of 1.5mm. At the same time, a steel plate sample for the bonding test is sprayed;

[0039] S4, spray polyurea material:

[0040] The coating is sprayed crosswise to ensure uniform thickness. The next spray should cover more than 50% of the previous one. The spray thickness should be kept consistent. The excess coating should be corrected and cut 3 to 5 minutes after spraying. The parameters should be observed at any time during spraying and recorded on site. The parameters include pressure and temperature.

[0041] S5. Coating inspection and finished product acceptance:

[0042] Coating inspection: During the manual spraying process, the thickness of the polyurea coating is mainly determined by the raw material supply of the main machine of the spraying equipment, the flow rate of the spray gun, and the gun travel speed and moving speed of the spray gun operator; the predetermined design thickness is 2.0±0.2mm. Before reaching the predetermined design thickness, the coating thickness is tested with a metal substrate thickness gauge, and multiple points are tested for leveling and filling;

[0043] Coating acceptance: After the polyurea spraying is completed, determine whether the coating thickness meets the requirements, whether all the parts that need to be sprayed have been sprayed, and whether the entire coating is continuous, dense and uniform;

[0044] S6. Remove protective shielding:

[0045] Spray polyurea coating to meet design requirements, remove protective shielding in time, do not tear the coating, use wallpaper knife to cut along steel ruler to the base layer, make sure the cutting is neat and beautiful;

[0046] S7. Finished product maintenance:

[0047] After the polyurea coating is applied, it is necessary to protect and maintain it in time, and prevent the coating from being damaged when lifting or moving the civil air defense door;

[0048] Do not place sharp heavy objects on the coating;

[0049] The product is cured outdoors for 72 hours, and the steel plate specimens and samples tested at the same time are placed and cured for 72 hours according to the test design.

[0050] The beneficial effects of the present invention are:

[0051] 1. The present invention aims to improve the performance of protective equipment products by comprehensively adopting new technologies, new materials, new structural forms and control methods. It adopts a new grille structure assembled with steel bars, combined with a filling component containing foamed aluminum and a polyurea explosion-proof material coated on the structure, which has a better explosion-proof effect than single foamed aluminum.

[0052] 2. The structure of the door leaf of the ultra-high strength protection door of the present invention is simple, the manufacturing cost is low, and it is easy to manufacture and process. Moreover, it can meet the requirements of lightweight and strong anti-explosion ability of the protection door, and has strong feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0054] Figure 1 is a schematic structural diagram of the door leaf of the ultra-high strength protection door of the present invention;

[0055] Figure 2 is a schematic diagram of the welding position of the L-shaped component in the door leaf of the ultra-high strength protection door of the present invention;

[0056] Figure 3 is a schematic diagram of the structure of the L-shaped component in the door leaf of the ultra-high strength protection door of the present invention;

[0057] Figure 4 is a schematic diagram of the structure of the strip-shaped component in the door leaf of the ultra-high strength protection door of the present invention;

[0058] Figure 5 is a schematic diagram of the structure of the grille layer in the door leaf of the ultra-high strength protection door of the present invention;

[0059] Figure 6 is a schematic diagram of the installation cross-section of the aluminum foam block and the explosion-proof component in the door leaf of the ultra-high strength protection door of the present invention;

[0060] Figure 7 is a schematic diagram of the structure of the aluminum foam block and the explosion-proof component in the door leaf of the ultra-high strength protection door of the present invention;

[0061] Figure 8 is a schematic diagram of the structure of the explosion-proof component in the door leaf of the ultra-high strength protection door of the present invention.

[0062] Reference numerals: 1, grille layer; 2, first panel; 3, second panel; 4, aluminum foam block; 5, L-shaped component; 6, frame; 7, welding hole; 8, strip-shaped component; 9, groove; 10, explosion-proof component; 101, first support piece; 102, second support piece; 103, first folding piece; 104, second folding piece; 105, folding line. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0063] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0064] To enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0065] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present invention described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0066] The development of protective equipment is inseparable from the guarantee of technology and the support of processing materials and processing techniques. The application of new technologies can bring about qualitative changes in the structural strength, anti-electromagnetic pulse and radiation effects of protective equipment. The application of new materials can not only directly improve the protection ability of protective equipment, but also improve the cost-effectiveness of protective equipment. The adoption of new processes can improve the quality of protective equipment, ensuring its reliable application and convenient maintenance.

[0067] The structure of the protective door is constantly being improved and developed. At present, the research on the protective door has shifted from initially focusing on the improvement of resistance to the lightweight design of the structure. To achieve the lightweight of the structure while meeting the requirements of technical and tactical indicators, it is difficult to meet the design requirements by simply changing the material type. While adopting new materials, corresponding lightweight and high-strength structures should be adopted. For example, various sandwich structures such as honeycomb structures, grid structures, and lattice structures can be explored for the feasibility of the door leaf structure.

[0068] The key to the ultra-high-strength protective door leaf of the present invention lies in its new structure, new materials, and new manufacturing process. The present invention adopts a new grid structure assembled by steel bars. The multi-layer composite structure of steel bar foam aluminum has a better explosion-proof effect than single foam aluminum. The grid structure is filled with foam aluminum to make a new protective door. The new protective door has good explosion shock wave attenuation performance and can play a protective role.

[0069] Example 1, such as Figure 1-5As shown in the figure, a door leaf of an ultra-high-strength protective door includes a grille layer 1, a first panel 2, a second panel 3, a filling component, an explosion-proof coating, and a frame 6. The filling component includes an L-shaped component 5 and an aluminum foam block 4. The L-shaped component 5 is composed of a first section piece and a second section piece, and the first section piece is vertically connected to the second section piece. The grille layer 1 is a grid-shaped component formed by intersecting a number of strip-shaped components 8. The filling component is arranged in the grid of the grille layer 1. The strip-shaped components 8 of the grille layer 1, the first panel 2, and the second panel 3 are all coated with an explosion-proof coating. The first panel 2 is connected to one side of the grille layer 1, the second panel 3 is connected to the other side of the grille layer 1, the grille layer 1 is embedded in the frame 6, the first section piece of the L-shaped component 5 is connected to the strip-shaped component 8 of the grille layer 1, and the second section piece of the L-shaped component 5 is connected to the first panel 2 or the second panel 3.

[0070] Further, the first panel 2, the second panel 3, the L-shaped component 5, the strip-shaped component 8, and the frame 6 are all made of steel.

[0071] Further, the grille layer 1 includes a number of strip-shaped components 8 arranged at equal intervals in a first direction and a number of strip-shaped components 8 arranged at equal intervals in a second direction. The first direction is perpendicular to the second direction. A number of equally spaced grooves 9 are provided on one side of each strip-shaped component 8. The strip-shaped components 8 in the first direction are embedded in the grooves 9 of the strip-shaped components 8 in the second direction, and the strip-shaped components 8 in the second direction are embedded in the grooves 9 of the strip-shaped components 8 in the first direction. The strip-shaped component 8 is made of a steel bar with a width of 100 mm and a thickness of 6 mm. During processing, a computer-controlled cutting machine cuts a number of grooves 9 on one side of the steel bar. Then, the staff assembles these steel bars into a grid structure. After all the steel bars are assembled, the staff welds and fixes the intersections of the grid, and then uses a spray gun to trim the ends of the steel plates so that they can be embedded in the steel frame. As long as the four-sided frame is fixed, the overall welding can be carried out. The main structure of the door leaf of the new type of protective door assembled with steel bars into a grid structure. Since the grid is a hollow structure, there is no need to worry about the excessive weight of the door body. By controlling the size of the grid and the thickness of the steel plate, the weight of the protective door is greatly reduced, and the strength of the protective door is improved.

[0072] The frame 6 in this embodiment is a quadrilateral, and the two diagonals of the quadrilateral are respectively parallel to the strip-shaped components 8 arranged at equal intervals in the first direction and the strip-shaped components 8 arranged at equal intervals in the second direction. After the grille layer 1 is embedded in the frame 6 and welded and fixed, all the strip-shaped components 8 and the frame 6 form a stable triangular shape, increasing the stability of the grille layer 1. Therefore, after the grille layer 1 is welded, the ends of the strip-shaped components 8 need to be trimmed before the grille layer can be embedded in the frame 6.

[0073] Furthermore, each grid in the grid layer 1 is filled with an aluminum foam block 4. Filling with aluminum foam and increasing the density of the aluminum foam can reduce the maximum displacement of the door leaf of the blast door and improve the anti-impact performance of the blast door, showing a higher energy absorption capacity. In addition, filling with aluminum foam can also prevent a sharp increase in the impact force when the panel of the door leaf of the blast door reaches densification.

[0074] Furthermore, the explosion-proof coating is a polyurea anti-explosion material. With the development of composite material structures, polyurea elastomers can be used to enhance the protection performance of composite material laminated structures under explosion or impact loads. The protection equipment that sprays polyurea materials on the main body of the door leaf of the blast door and the inner and outer surfaces of the door leaf not only has stronger anti-rust and anti-extrusion and collision performance, but also has stronger anti-shock wave performance, and improves the situation of large size and heavy weight of the protection equipment, achieving the purpose of light weight and high strength. The polyurea anti-explosion material has a large plastic deformation ability. Sprayed on the grid of the blast door, it can improve the plastic deformation ability of the blast door. The polyurea coating effectively reduces the maximum deflection of the blast door and significantly improves the airtight performance of the blast door.

[0075] The L-shaped component 5 is an L-shaped steel sheet. As Figure 2 shown, a number of L-shaped steel sheets are equally spaced and welded on one side of each strip-shaped component 8 of the grid layer 1 for supporting the first panel 2, and L-shaped steel sheets are equally spaced and welded on the other side of each strip-shaped component 8 for supporting the second panel 3, so that the door leaf is evenly stressed and the deformation in all directions is coordinated. At the same time, through the setting of the L-shaped steel sheets, the contact area between the first panel 2 and the second panel 3 and the grid layer 1 is also increased, thereby enhancing the stability and anti-explosion ability of the door leaf structure.

[0076] When welding the L-shaped steel sheets, a rope is used for positioning to ensure that all the L-shaped steel sheets on the same side are on the same horizontal plane, ensuring full contact between the L-shaped steel sheets and the first panel 2 or the second panel 3. The function of these L-shaped steel sheets is to make the first panel 2 or the second panel 3 more firmly installed on the grid layer 1.

[0077] Furthermore, welding holes 7 are provided on both the first panel 2 and the second panel 3, and the welding holes 7 are connected to the second section of the L-shaped component 5. Directly welding the first panel 2 and the second panel 3 to the L-shaped steel sheet at the welding holes not only improves the welding stability of the first panel 2 and the second panel 3, but also reduces the welding difficulty and improves the welding efficiency.

[0078] Due to a series of reasons such as the difficult construction of some materials, it is difficult for new materials to be widely used in the production field of blast doors. However, the structure of the door leaf of the ultra-high strength blast door of the present invention is simple, the manufacturing cost is low, and it is easy to manufacture and process, which can meet the requirements of light weight and strong anti-explosion ability of the blast door, and has strong feasibility.

[0079] Since it is difficult to meet the design requirements by simply changing the material type, while adopting a new material, the present invention adopts a corresponding lightweight and high-strength steel plate grid structure, and points out the specific manufacturing and construction process routes. The following is the method for manufacturing a super high-strength protective door leaf of this embodiment, and the specific steps are as follows:

[0080] S01. Assemble the strip-shaped components 8 into a grid assembly, weld and fix the intersections of the strip-shaped components 8 to form a grid layer 1;

[0081] S02. Use a spray gun to trim the ends of the strip-shaped components 8, fix the frame 6, embed the grid layer 1 in the frame 6, and weld and fix the connections between the strip-shaped components 8 and the frame 6 to achieve overall welding;

[0082] S03. Fill the grids of the grid layer 1 with foam aluminum blocks;

[0083] S04. Use a rope for positioning, weld the L-shaped components 5 on the strip-shaped components 8, ensure that the L-shaped components 5 on the same side are welded to the same level, so as to achieve full contact with the first panel 2 or the second panel 3. Weld one side first, and then weld the other side;

[0084] S05. Spray the explosion-proof coating on the strip-shaped components 8;

[0085] S06. Drill welding holes 7 in the first panel 2 and the second panel 3;

[0086] S07. Take measures to cover the welding holes 7, and spray the explosion-proof coating on both sides of the first panel 2 and the second panel 3;

[0087] S08. Fix the first panel 2 and the second panel 3 on both sides of the grid layer 1 respectively, align the welding holes 7 with the second section pieces of the L-shaped components 5, weld and fix the edges of the first panel 2 and the second panel 3 to the frame 6, and further weld the welding holes 7 to the other ends of the L-shaped components 5 at the welding holes 7. Thus, the manufacturing of the super high-strength protective door leaf is completed.

[0088] Description of the spraying process of the polyurea material:

[0089] Coating requirements: The coating color should be uniform, the coating should be continuous, without missed spraying and running, without bubbles, pinholes, peeling, scratches, wrinkles, cracks, foreign matters, and the thickness should meet the design requirements.

[0090] Construction process flow

[0091] Base treatment → Protection and shielding (non-spraying parts) → Equipment inspection and trial spraying → Spraying polyurea material → Coating inspection and finished product acceptance → Protection removal → Finished product maintenance.

[0092] The spraying in the above steps S05 and / or S07 includes the following steps:

[0093] S1. Substrate treatment:

[0094] Shot blasting and grinding for rust removal: The metal substrate is shot blasted and the rust and oil stains on the surface are cleaned off. The shot blasting reaches the Sa2.5 standard. For special parts such as welds and internal and external corners, a angle grinder is used for grinding and chamfering to grind the protrusions such as welding slag and burrs flat;

[0095] Cleaning: Use anhydrous and oil-free compressed air or a vacuum cleaner to clean the rust slag and other dirt;

[0096] Substrate treatment acceptance: After the substrate treatment is completed, the next process can only be carried out after passing the inspection;

[0097] S2. Protective shielding:

[0098] According to the design requirements, the door leaves, door frames, etc. are sprayed with anti-explosion polyurea materials, and the parts that do not need to be sprayed are shielded by using transparent tape, masking tape or plastic protective tape;

[0099] Protective shielding acceptance: Confirm that the protective shielding is in place to ensure that the parts to be constructed can be sprayed;

[0100] S3. Equipment inspection and trial spraying:

[0101] Check the equipment before construction to determine whether the main machine, spray gun and auxiliary equipment can work normally;

[0102] Parameter setting, set the pipeline pressure and heating temperature, and start the pipeline heating 30 minutes in advance;

[0103] Before spraying, the spraying material must be fully stirred for 30 minutes until the color is uniform, without floating color, blooming, and no dead precipitation;

[0104] Carry out trial spraying, observe whether the sprayed coating film is normal. The trial spraying sampling template is a PVC board coated with release agent, the coating thickness is 1.5mm, and a steel plate sample for adhesion test is sprayed simultaneously;

[0105] S4. Spraying polyurea material:

[0106] The coating is sprayed crosswise to ensure uniform thickness. The next spraying should cover more than 50% of the previous one. The spraying thickness is kept consistent. After spraying, the excess coating is corrected and cut within 3 - 5 minutes. During spraying, parameters such as pressure and temperature should be observed at any time, and on-site records should be made;

[0107] S5. Coating inspection and finished product acceptance:

[0108] Coating inspection: During the manual spraying process, the thickness of the polyurea coating is mainly determined by the supply volume of the main raw materials of the spraying equipment, the flow rate of the spray gun, the walking speed and the advancing speed of the sprayer. Usually, spraying three times can achieve a thickness of 2.0 ± 0.2 mm. Therefore, before reaching the predetermined design thickness, use a metal substrate thickness gauge to test the coating thickness, detect at multiple points, level and fill in the gaps, and communicate in a timely manner between the measurement personnel and the spraying personnel to make the constructed coating meet the design requirements;

[0109] Coating acceptance: After the polyurea spraying is completed, report to the technical supervisor for acceptance. The coating thickness meets the requirements, and all the parts that need to be sprayed have been sprayed. The entire coating is continuous, dense, and uniform;

[0110] S6. Remove the protective shield:

[0111] When the sprayed polyurea coating meets the design requirements, promptly remove the protective shield. Do not tear the coating. Use a wallpaper knife to cut along the steel straightedge to the base layer, ensuring that the cutting is neat and beautiful.

[0112] S7. Product curing:

[0113] After the construction of the polyurea coating is completed, it is necessary to promptly carry out protection and curing. When lifting or moving the civil air defense door, prevent damage to the coating;

[0114] Do not place sharp heavy objects on the coating;

[0115] The product is cured outdoors for 72 hours. The steel plate specimens and sample pieces for the concurrent test are placed for curing for 72 hours according to the test design.

[0116] Requirements for polyurea material spraying protection measures:

[0117] (1) The coating system can adopt epoxy anti-corrosion coating or P0ZD high-performance anti-corrosion coating. When using epoxy anti-corrosion coating, the thickness of the epoxy anti-rust primer (epoxy resin + pigment filler + solvent + curing agent) is 80 μm, the thickness of the epoxy intermediate paint (epoxy resin + mica iron oxide + anti-rust pigment + organic solvent + curing agent) is 100 μm, and the thickness of the chlorinated rubber finish paint (chlorinated rubber modified resin + pigment + filler + organic solvent) is 100 μm. The total dry film thickness is 280 μm. When using polyurea high-performance anti-corrosion coating, the single spraying thickness is 0.3 mm, and it is sprayed 2 times. The total dry film thickness after spraying is 0.6 mm. For the high-salt and high-humidity environment in coastal areas, it is recommended to use polyurea high-performance anti-corrosion coating for painting. When using polyurea spraying, the spraying technology shall be implemented in accordance with the relevant technical requirements of the scientific research achievement "Research and Development of Polyurea Composite Protection Equipment" identified by the National Civil Air Defense Office.

[0118] (2) Before painting, the surfaces of the door leaves and the inner and outer exposed surfaces of the inspection holes are treated by sandblasting, and the surface cleanliness grade is not lower than Sa2.5. When using epoxy anti-corrosion paint, two to three coats of epoxy anti-rust primer, one coat of epoxy intermediate paint and one coat of oxidized rubber topcoat are sprayed on the exposed surfaces of the door leaves and the inner and outer exposed surfaces of the inspection holes before the door leaves leave the factory. When using polyurea high-performance anti-corrosion materials, the spraying is completed before the door leaves leave the factory.

[0119] (3) During the implementation of installation, modification and operation, mechanical damage to the coating should be avoided.

[0120] (4) After the installation and commissioning of the door leaves are completed, the coating of the exposed surface is inspected, and if local damage is found, it should be repaired in time.

[0121] (5) Conduct a coating integrity inspection before the end of the quality guarantee period. If local damage is found, the coating should be repaired in time.

[0122] (6) After the quality guarantee period, the maintenance frequency of the epoxy anti-corrosion coating is once every 5 years in the initial stage (the first 15 years) and once every 10 years after the middle stage. When using polyurea high-performance anti-corrosion paint, it is maintenance-free within the design life of 50 years.

[0123] In the second embodiment, the filling component includes the explosion-proof part 10 and the foam aluminum block 4, which is different from the first embodiment. The other structures in the ultra-high-strength protection door leaf are the same as those in the first embodiment and will not be elaborated here.

[0124] As Figures 7-8 shown, the explosion-proof part 10 includes a first support piece 101, a second support piece 102, a first folding piece 103 and a second folding piece 104. The first support piece 101 and the second support piece 102 are parallel. The first folding piece 103 and the second folding piece 104 are symmetrically arranged between the first support piece 101 and the second support piece 102. The folding line 105 of the first folding piece 103 and the folding line 105 of the second folding piece 104 are both parallel to the first support piece 101. One end of the first folding piece 103 parallel to the folding line 105 and one end of the second folding piece 104 parallel to the folding line 105 are both connected to the bottom surface of the first support piece. The other end of the first folding piece 103 parallel to the folding line 105 and the other end of the second folding piece 104 parallel to the folding line 105 are both connected to the top surface of the second support piece 102. The space formed by the first support piece 101, the second support piece 102, the first folding piece 103 and the second folding piece 104 is filled with the foam aluminum block 4.

[0125] In this embodiment, the explosion-proof part 10 is installed in the rectangular grid in the grid layer 1. In the remaining grids that are not rectangular, the filling component uses the L-shaped part 5 and the foam aluminum block 4 in the first example to ensure the best explosion-proof effect.

[0126] As Figure 6As shown in the figure, it is a sectional view of a single explosion-proof part 10 installed in a single rectangular grid. The first panel 2 is connected to the first support piece 101, and the second panel 3 is connected to the second support piece 102. The first panel 2 and the second panel 3 are respectively welded firmly to the first support piece 101 and the second support piece 102 directly at the welding holes 7. The four sides of the first panel 2 are in contact with the upper ends of the strip-shaped parts 8 in the grid layer 1, and the four sides of the second panel 3 are in contact with the lower ends of the strip-shaped parts 8 in the grid layer 1. The outer sides of the folding lines of the first folding piece 103 and the second folding piece 104 are not in contact with the middle parts of the strip-shaped parts in the grid layer, and there is a certain distance interval, forming a deformation space for the first folding piece 103 or the second folding piece 104 to deform when under pressure. The explosion-proof part 10, the aluminum foam block 4 and the grid layer 1 are combined to jointly improve the explosion resistance of the door leaf.

[0127] The method for manufacturing a door leaf of an ultra-high-strength protection door in this embodiment specifically includes the following steps:

[0128] S01. Assemble the strip-shaped parts 8 into a grid assembly, weld and fix the intersections of the strip-shaped parts 8 to form the grid layer 1;

[0129] S02. Use a spray gun to trim the ends of the strip-shaped parts 8, fix the frame 6, embed the grid layer 1 in the frame 6, and weld and fix the connection between the strip-shaped parts 8 and the frame 6 to achieve overall welding;

[0130] S03. Use a rope for positioning, weld the L-shaped parts 5 on the non-rectangular grids of the strip-shaped parts 8, ensure that the L-shaped parts 5 on the same side are welded to the same level to achieve full contact with the first panel 2 or the second panel 3, weld one side first, and then weld the other side;

[0131] S04. Fill the non-rectangular grids of the grid layer 1 with aluminum foam blocks;

[0132] S05. Spray explosion-proof paint on the strip-shaped parts 8;

[0133] S06. Drill welding holes 7 in the first panel 2 and the second panel 3;

[0134] S07. Take measures to block the welding holes 7, and spray explosion-proof paint on both sides of the first panel 2 and the second panel 3;

[0135] S08. Put the processed explosion-proof part 10 filled with the aluminum foam block 4 into the rectangular grid of the grid layer 1;

[0136] S09. Fix the first panel 2 and the second panel 3 on both sides of the grille layer 1 respectively: Align the welding holes 7 with the first support piece 101 or the second support piece 102 of the explosion-proof part 10 and the second section piece of the L-shaped part 5, weld and fix the edges of the first panel 2 and the second panel 3 to the frame 6, and further weld the welding holes 7 with the first support piece 101 or the second support piece 102 of the explosion-proof part 10 and the second section piece of the L-shaped part 5 at the welding holes 7. Thus, the manufacturing of the ultra-high-strength protection door leaf is completed.

[0137] The spraying process of the polyurea material is the same as that in the embodiment and will not be elaborated here.

[0138] For those skilled in the art, various corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A door leaf of an ultra-high-strength protective door, characterized in that, It includes a grille layer (1), a first panel (2), a second panel (3), an explosion-proof coating, a filling component and a frame (6). The grille layer (1) is a grid-shaped component formed by staggered connection of a number of strip-shaped members (8). The filling component is arranged in the grid of the grille layer (1). The strip-shaped members (8) of the grille layer (1), the first panel (2) and the second panel (3) are all coated with the explosion-proof coating. The first panel (2) is connected to one side of the grille layer (1), and the second panel (3) is connected to the other side of the grille layer (1). The grille layer (1) is embedded in the frame (6); The filling component includes an aluminum foam block (4) and an L-shaped member (5). The L-shaped member (5) is composed of a first section piece and a second section piece. The first section piece is perpendicularly connected to the second section piece. The first section piece of the L-shaped member (5) is connected to the strip-shaped member (8) of the grille layer (1), and the second section piece of the L-shaped member (5) is connected to the first panel (2) or the second panel (3). A number of the L-shaped members (5) are equally spaced on one side of each strip-shaped member (8) for connection with the first panel (2), and a number of L-shaped members (5) are equally spaced on the other side of each strip-shaped member (8) for connection with the second panel (3).

2. The super high strength protective door leaf according to claim 1, characterized in that, The explosion-proof coating is a polyurea explosion-proof material.

3. The super high strength protection door leaf according to claim 2, characterized in that, Welding holes (7) are provided on both the first panel (2) and the second panel (3), and the welding holes (7) are connected to the filling component.

4. The door leaf of an ultra-high strength protective door according to claim 3, characterized in that, The grille layer (1) includes a number of strip-shaped members (8) arranged at equal intervals in a first direction and a number of strip-shaped members (8) arranged at equal intervals in a second direction. The first direction is perpendicular to the second direction. A number of equally spaced grooves (9) are provided on one side of each strip-shaped member (8). The strip-shaped members (8) in the first direction are embedded in the grooves (9) of the strip-shaped members (8) in the second direction, and the strip-shaped members (8) in the second direction are embedded in the grooves (9) of the strip-shaped members (8) in the first direction.

5. The door leaf of an ultra-high strength protective door according to claim 4, characterized in that, Each strip-shaped member (8) and the frame (6) form a triangular structure.

6. The super high-strength protection door leaf according to claim 1, wherein The filling component includes an explosion-proof part (10) and an aluminum foam block (4). The explosion-proof part (10) includes a first support piece (101), a second support piece (102), a first folding piece (103) and a second folding piece (104). The first support piece (101) and the second support piece (102) are parallel. The first folding piece (103) and the second folding piece (104) are symmetrically arranged between the first support piece (101) and the second support piece (102). The folding lines (105) of the first folding piece (103) and the second folding piece (104) are both parallel to the first support piece (101). One end of the first folding piece (103) parallel to the folding line (105) and one end of the second folding piece (104) parallel to the folding line (105) are both connected to the bottom surface of the first support piece. The other end of the first folding piece (103) parallel to the folding line (105) and the other end of the second folding piece (104) parallel to the folding line (105) are both connected to the top surface of the second support piece (102). The space formed by the first support piece (101), the second support piece (102), the first folding piece (103) and the second folding piece (104) is filled with the aluminum foam block (4).

7. An ultra-high-strength protective door leaf according to claim 6, characterized in that, The first support piece (101) is connected to the first panel (2), and the second support piece (102) is connected to the second panel (3). The four sides of the first panel (2) are all in contact with the upper ends of the strip-shaped parts (8) in the grid layer (1). The four sides of the second panel (3) are all in contact with the lower ends of the strip-shaped parts (8) in the grid layer (1). The outer sides of the folding lines (105) of the first folding piece (103) and the second folding piece (104) are not in contact with the middle parts of the strip-shaped parts (8) in the grid layer (1). The area surrounded by the second folding piece (104), the first support piece (101), the second support piece (102) and the strip-shaped part (8) is the deformation space of the second folding piece (104).

8. A method for manufacturing a door leaf of an ultra-high strength protective door according to any one of claims 3-5, characterized in that, It includes the following steps: S01. Assemble the strip-shaped parts (8) into a grid component, weld and fix the intersections of the strip-shaped parts (8) to form a grid layer (1); S02. Use a spray gun to trim the ends of the strip-shaped parts (8), embed the grid layer (1) in the frame, and weld and fix the connection between the strip-shaped parts (8) and the frame (6); S03. Fill the filling component into the grid of the grid layer (1); S04. Use a rope for positioning and fix the filling component on the strip-shaped parts; S05. Spray explosion-proof paint on the strip-shaped parts (8); S06. Drill welding holes (7) in the first panel (2) and the second panel (3); S07. Take measures to block the welding holes (7), and spray explosion-proof paint on both sides of the first panel (2) and the second panel (3); S08, fixing the first panel (2) and the second panel (3) on both sides of the grid layer (1), aligning the welding hole (7) with the filling component, welding the edges of the first panel (2) and the second panel (3) to the frame (6), and further welding the welding hole (7) and the filling component together at the welding hole (7), and the ultra-high strength protective door leaf is manufactured.

9. The method according to claim 8, wherein The spraying of S05 and / or S07 comprises the following steps: S1. Base treatment: Sandblasting and rust removal: The metal substrate is sandblasted to remove rust and oil on the surface. The sandblasting reaches Sa2.5 standard. Special parts are grinded and chamfered with an angle grinder to smooth the protrusions. The special parts include welds and corners. The protrusions include welding slag and burrs. Cleaning: Use water-free and oil-free compressed air or a vacuum cleaner to clean the rust residue; Acceptance of base treatment: After the base treatment is completed, the next process can be carried out only after it is qualified; S2. Protective shielding: According to the design requirements, the door leaf and door frame are sprayed with explosion-proof polyurea material, and the parts that do not need to be sprayed are masked with transparent tape or masking paper; Protection shielding acceptance: Confirm that the protection shielding is in place to ensure that the parts to be constructed can be sprayed; S3. Equipment inspection and test spraying: Equipment inspection before construction to determine whether the main machine, spray gun and auxiliary equipment can work normally; Parameter setting, set pipeline pressure and heating temperature, and start pipeline heating 30 minutes in advance; Before spraying, the spraying material must be fully stirred for 30 minutes until the color is uniform and there is no floating color, blooming, or dead precipitation. Test spraying is carried out to observe whether the spray coating is normal. The test spraying sample is a PVC plate coated with a release agent, with a coating thickness of 1.5mm. At the same time, a steel plate sample for the bonding test is sprayed; S4, spray polyurea material: The coating is sprayed crosswise to ensure uniform thickness. The next spray should cover more than 50% of the previous one. The spray thickness should be kept consistent. The excess coating should be corrected and cut 3 to 5 minutes after spraying. The parameters should be observed at any time during spraying and recorded on site. The parameters include pressure and temperature. S5. Coating inspection and finished product acceptance: Coating inspection: During the manual spraying process, the thickness of the polyurea coating is mainly determined by the raw material supply of the main machine of the spraying equipment, the flow rate of the spray gun, and the gun travel speed and moving speed of the spray gun operator; the predetermined design thickness is 2.0±0.2mm. Before reaching the predetermined design thickness, the coating thickness is tested with a metal substrate thickness gauge, and multiple points are tested for leveling and filling; Coating acceptance: After the polyurea spraying is completed, determine whether the coating thickness meets the requirements, whether all the parts that need to be sprayed have been sprayed, and whether the entire coating is continuous, dense and uniform; S6. Remove protective shielding: Spray polyurea coating to meet design requirements, remove protective shielding in time, do not tear the coating, use wallpaper knife to cut along steel ruler to the base layer, make sure the cutting is neat and beautiful; S7. Finished product maintenance: After the polyurea coating is constructed, it is necessary to protect and maintain it in time, and prevent the coating from being damaged when lifting or moving the protective door; Do not place sharp heavy objects on the coating; The product is cured outdoors for 72 hours. The steel plate specimens and specimens for the concurrent test are placed for curing for 72 hours according to the test design.

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