A corrosion-resistant building steel plate that is convenient for disassembly, assembly and maintenance

Abstract

The present invention discloses a corrosion-resistant building steel plate that is convenient for disassembly and maintenance, including a first steel substrate, a second steel substrate, and a sound insulation structural plate. The sound insulation structural plate is located between the first steel substrate and the second steel substrate. A fixing mechanism is provided inside the sound insulation structural plate, and a grasping mechanism is provided on the second steel substrate. The fixing mechanism is fixedly installed at the center of the sound insulation structural plate. The fixing mechanism includes a bolt, a spring, a limiting ring, and a cam. A pin hole matching with the bolt is provided on the side of the sound insulation structural plate. The grasping mechanism is fixedly installed at the center of the second steel substrate. The grasping mechanism includes a turntable, a handle, and a piston button. It has the advantages of convenient installation and disassembly and easy handling of the steel plate, and solves the problems in the prior art that the building steel plate is not convenient for quick installation and disassembly, affecting the construction efficiency, and the lack of grasping points on the steel plate after disassembly, resulting in inconvenient handling of the steel plate and the risk of falling and injuring workers.

Description

Technical Field

[0001] The present invention relates to the technical field of building steel plates, and particularly to a corrosion-resistant building steel plate that is convenient for disassembly, assembly and maintenance. Background Art

[0002] In the current construction industry, as one of the important building materials, corrosion-resistant building steel plates can be quickly assembled into the required structures for temporary exhibition halls, concert halls, sports event venues, etc. that need to be quickly erected and demolished. After the event, they can be conveniently disassembled and reused, reducing material waste and construction costs.

[0003] Traditional installation methods often rely on fixing means such as bolts and welding. This not only requires a large amount of manual operation, but may also cause damage to the steel plates. Moreover, disassembly is also time-consuming and laborious, which is not conducive to quick replacement or repair. In addition, the volume of the steel plates after disassembly is too large, and sometimes it is difficult to grasp the sides of the steel plates with both hands, resulting in inconvenience in handling the steel plates. Therefore, a corrosion-resistant building steel plate that is convenient for disassembly, assembly and maintenance is needed to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a corrosion-resistant building steel plate that is convenient for disassembly, assembly and maintenance, which has the advantages of convenient installation and disassembly and easy handling of the plates, and solves the problems in the prior art that the building steel plates are not convenient for quick installation and disassembly, affecting the construction efficiency, and the disassembled steel plates lack grasping points, resulting in inconvenience in handling the plates and posing a risk of falling and injuring workers.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A corrosion-resistant building steel plate that is convenient for disassembly, assembly and maintenance, including a first steel substrate, a second steel substrate and a sound insulation structure board. The sound insulation structure board is located between the first steel substrate and the second steel substrate. A fixing mechanism is arranged inside the sound insulation structure board, and a grasping mechanism is arranged on the second steel substrate.

[0006] The fixing mechanism is fixedly installed at the center of the sound insulation structure board. The fixing mechanism includes a bolt, a spring, a limiting ring and a cam. A pin hole matching with the bolt is arranged on the side of the sound insulation structure board.

[0007] The grasping mechanism is fixedly installed at the center of the second steel substrate. The grasping mechanism includes a turntable, a handle and a piston button.

[0008] Preferably, as a corrosion-resistant building steel plate that is convenient for disassembly, maintenance, and installation, a guiding hole is provided on the limiting ring. The plug pin is inserted into the guiding hole and is slidably connected to the limiting ring. The cam is installed at the center of the limiting ring. A shaft hole is provided at the center of the lower end surface of the cam. A rotating shaft is provided on the upper end surface of the bottom of the first steel substrate. The rotating shaft is inserted into the shaft hole and is rotatably connected to the first steel substrate through a bearing. A pulley that fits with the cam is provided at the bottom of the plug pin. A spring is provided on the plug pin. A sliding hole is provided in the sound insulation structural board. The plug pin is inserted into the sliding hole and is elastically connected to the sound insulation structural board through the spring.

[0009] Preferably, as a corrosion-resistant building steel plate that is convenient for disassembly, maintenance, and installation, the cam is provided with a convex portion that fits with the pulley. The number of the convex portions is four. The four groups of convex portions are equally spaced in a circumferential array. The number of the plug pins is four, and the plug pin and the pin hole on its opposite side are on the same axis.

[0010] Preferably, as a corrosion-resistant building steel plate that is convenient for disassembly, maintenance, and installation, a first limiting projection is provided on the inner end surface of the limiting ring. A first limiting surface and a second limiting surface are provided on the first limiting projection. When the convex portion fits with the first limiting surface, the top of the plug pin is flush with the side surface of the sound insulation structural board. When the convex portion fits with the second limiting surface, the bottom of the plug pin is completely received into the guiding hole.

[0011] Preferably, as a corrosion-resistant building steel plate that is convenient for disassembly, maintenance, and installation, a second limiting projection is provided in the limiting ring. A limiting groove corresponding to the shape of the convex portion is formed between the second limiting projection and the first limiting projection.

[0012] Preferably, as a corrosion-resistant building steel plate that is convenient for disassembly, maintenance, and installation, a through hole is provided at the center of the second steel substrate. The turntable is installed in the through hole and is rotatably connected to the second steel substrate through a bearing. A hidden groove for storing the handle is provided on the turntable. A first limiting hole is provided at the bottom of the hidden groove. A limiting rod is provided on the lower end surface of the handle. The handle is slidably connected to the turntable by inserting the limiting rod into the first limiting hole.

[0013] Preferably, as a corrosion-resistant building steel plate that is convenient for disassembly, maintenance, and installation, a second limiting hole corresponding to the limiting rod is provided on the cam. A third limiting hole corresponding to the limiting rod is provided on the first steel substrate. When the cam fits with the first limiting projection, the limiting rod is aligned with the third limiting hole. The limiting rod sequentially passes through the second limiting hole and the third limiting hole and is slidably connected to the cam and the first steel substrate.

[0014] Preferably, as a corrosion-resistant building steel plate that is convenient for disassembly, maintenance and assembly, a first-stage sleeve is arranged at the top of the cam, a second-stage sleeve is arranged at the center of the lower end surface of the handle, the second-stage sleeve is inserted into the first-stage sleeve and is in sliding and sealing connection with it, the piston button is installed in the second-stage sleeve and is in sliding and sealing connection with it, and the first-stage sleeve and the second-stage sleeve are filled with hydraulic oil.

[0015] Preferably, as a corrosion-resistant building steel plate that is convenient for disassembly, maintenance and assembly, a first limiting flange is arranged at the edge of the inner end surface of the first-stage sleeve, and a second limiting flange is arranged at the outer end surface of the bottom of the second-stage sleeve.

[0016] Preferably, as a corrosion-resistant building steel plate that is convenient for disassembly, maintenance and assembly, an anti-corrosion coating is sprayed on the outer end surfaces of the first steel substrate and the second steel substrate, and the anti-corrosion coating is a nano-titanium dioxide coating.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. Through the cooperation of the fixing mechanism and the grasping mechanism, the present invention can activate the lifting function of the handle by simply pressing the knob. Subsequently, only by rotating the handle can the rotation of the cam be controlled, and then the expansion and contraction of all the bolts can be synchronously controlled. The linkage mechanism between the cam and multiple bolts in the design ensures that all the bolts can work simultaneously and synchronously, avoiding the tediousness of operating one by one, making the installation or disassembly process of the building steel plate rapid and orderly, greatly shortening the installation and disassembly time, and improving work efficiency.

[0019] 2. When not in use, the handle of the present invention is retracted into the hidden groove, which not only keeps the appearance flat, but also avoids the rotation operation unconsciously through physical locking, preventing the loosening or falling off of the structure caused by misoperation, increasing safety. The design of retracting into the hidden groove does not occupy extra space. Especially in an environment with limited space, this compact design is particularly important, which helps to optimize the building layout and improve the space utilization efficiency. Through the fine cooperation between the limiting ring and the cam, and the setting of the second limiting protrusion, the firm locking of the bolt in the normal use state is ensured, and it can remain stable even under slight external vibration, effectively avoiding accidental loosening.

[0020] 3. The nano-titanium dioxide coating sprayed on the outer end surfaces of the first steel substrate and the second steel substrate of the present invention not only endows the building steel plate with excellent anti-corrosion performance, but also can decompose surface pollutants by using its photocatalytic property, keep the plate surface clean, extend the service life, reduce the maintenance cost, and improve the service life of the plate in the use scenario of long-term exposure outdoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded view of the present invention;

[0022] Figure 2 Schematic diagram of the mating state of the docking mechanism of the present invention;

[0023] Figure 3 of the present invention Figure 2 Top view;

[0024] Figure 4 of the present invention Figure 3 Enlarged view at position A in

[0025] Figure 5 Schematic diagram of the limit ring mechanism of the present invention;

[0026] Figure 6 Schematic diagram of the sectional structure of the present invention;

[0027] Figure 7 of the present invention Figure 6 Enlarged view at position B in

[0028] Figure 8 of the present invention Figure 7 Enlarged view at position C in

[0029] In the figure: 1. First steel substrate; 101. Third limit hole; 2. Sound insulation structure board; 201. Slide hole; 202. Pin hole; 3. Second steel substrate; 4. Fixing mechanism; 401. Cam; 4011. Protrusion; 4012. First sleeve; 4013. First limit flange; 402. Plug pin; 4021. Pulley; 403. Spring; 404. Limit ring; 4041. First limit protrusion; 40411. First limit surface; 40412. Second limit surface; 4042. Second limit protrusion; 4043. Guide hole; 405. Second limit hole; 5. Gripping mechanism; 501. Turntable; 5011. Dark groove; 5012. First limit hole; 502. Handle; 5021. Limit rod; 5022. Second sleeve; 5023. Second limit flange; 503. Piston button. Detailed implementation manners

[0030] Please refer to Figures 1-8 , a corrosion-resistant building steel plate that is convenient for disassembly, assembly and maintenance, including a first steel substrate 1, a second steel substrate 3 and a sound insulation structure board 2. The sound insulation structure board 2 is located between the first steel substrate 1 and the second steel substrate 3. The first steel substrate 1 and the second steel substrate 3 are made of steel plates, and the sound insulation structure board 2 is made of polystyrene board. A fixing mechanism 4 is arranged inside the sound insulation structure board 2, and a gripping mechanism 5 is arranged on the second steel substrate 3;

[0031] The fixing mechanism 4 is fixedly installed at the center of the sound insulation structure board 2. The fixing mechanism 4 includes a bolt 402, a spring 403, a limiting ring 404 and a cam 401. A pin hole 202 cooperating with the bolt 402 is arranged on the side surface of the sound insulation structure board 2;

[0032] The grasping mechanism 5 is fixedly installed at the center of the second steel substrate 3. The grasping mechanism 5 includes a turntable 501, a handle 502 and a piston button 503.

[0033] Furthermore, a guiding hole 4043 is arranged on the limiting ring 404. The bolt 402 is inserted into the guiding hole 4043 and is slidably connected with the limiting ring 404. The cam 401 is installed at the center of the limiting ring 404. A shaft hole is arranged at the center of the lower end surface of the cam 401. A rotating shaft is arranged on the upper end surface of the bottom of the first steel substrate 1. The rotating shaft is inserted into the shaft hole and is rotatably connected with the first steel substrate 1 through a bearing. A pulley 4021 fitting with the cam 401 is arranged at the bottom of the bolt 402. A spring 403 is arranged on the bolt 402. A sliding hole 201 is arranged in the sound insulation structure board 2. The bolt 402 is inserted into the sliding hole 201 and is elastically connected with the sound insulation structure board 2 through the spring 403.

[0034] When the cam 401 rotates, the cam 401 presses the pulley 4021 at the bottom of the bolt 402, so that the bolt 402 extends outwards and is inserted into the pin hole 202 of the wall or the adjacent steel plate. When the cam 401 rotates reversely, the bottom of the bolt 402 is released from the limit, so that the bolt 402 can rebound under the reset action of the spring 403, so that the bolt 402 slides out of the pin hole 202, and the building steel plate can be quickly removed.

[0035] Furthermore, a convex portion 4011 fitting with the pulley 4021 is arranged on the cam 401. The number of the convex portions 4011 is four. The four groups of convex portions 4011 are equidistantly arranged in a circumferential array. The number of the bolts 402 is four, and the bolt 402 and the pin hole 202 on its opposite side are on the same axis.

[0036] When the cam 401 rotates clockwise, the four convex portions 4011 simultaneously press the four groups of bolts 402, so that the four groups of bolts 402 on the upper, lower, left and right sides extend out simultaneously, so that the four sides of the building steel plate are fixed simultaneously.

[0037] Furthermore, a first limiting convex portion 4041 is arranged on the inner end surface of the limiting ring 404. A first limiting surface 40411 and a second limiting surface 40412 are arranged on the first limiting convex portion 4041. When the convex portion 4011 fits with the first limiting surface 40411, the top of the bolt 402 is flush with the side surface of the sound insulation structure board 2. When the convex portion 4011 fits with the second limiting surface 40412, the bottom of the bolt 402 is completely received into the guiding hole 4043.

[0038] The rotation angle of the cam 401 is restricted by the first limiting protrusion 4041, thereby dividing the cam 401 into two gears. When the protrusion 4011 is in contact with the first limiting surface 40411, the bolt 402 is in the retracted state, facilitating the quick removal or installation of the building steel plate. When the protrusion 4011 is in contact with the second limiting surface 40412, the bolt 402 is in the extended state, thereby fixing the building steel plate and preventing the building steel plate from moving.

[0039] Furthermore, a second limiting protrusion 4042 is arranged inside the limiting ring 404, and a limiting groove corresponding to the shape of the protrusion 4011 is formed between the second limiting protrusion 4042 and the first limiting protrusion 4041.

[0040] The second limiting protrusion 4042 provides a certain resistance for the counterclockwise rotation of the cam 401, thereby preventing the cam 401 from automatically rotating without external force, causing the cam 401 to automatically rotate when the handle 502 just rises and the building steel plate lacks support and falls off, ensuring the safety of the building steel plate.

[0041] Furthermore, a through hole is arranged at the center of the second steel substrate 3, and the turntable 501 is installed in the through hole and rotatably connected to the second steel substrate 3 through a bearing. A hidden groove 5011 for accommodating the handle 502 is arranged on the turntable 501, a first limiting hole 5012 is arranged at the bottom of the hidden groove 5011, a limiting rod 5021 is arranged on the lower end surface of the handle 502, and the handle 502 is slidably connected to the turntable 501 by inserting the limiting rod 5021 into the first limiting hole 5012.

[0042] The handle 502 can slide back and forth. When installing or disassembling the building steel plate, the handle 502 is pulled outwards. The handle 502 provides a grasping position for the worker, and at the same time, the cam 401 can be driven to rotate through the handle 502, so that the bolt 402 is taken out from the pin hole 202. After the installation is completed, the handle 502 can be retracted into the hidden groove 5011, which does not affect the flatness of the overall plate, and the handle 502 can rotate around the center of the turntable 501, thereby driving the bolt 402.

[0043] Furthermore, a second limiting hole 405 corresponding to the limiting rod 5021 is arranged on the cam 401, and a third limiting hole 101 corresponding to the limiting rod 5021 is arranged on the first steel substrate 1. When the cam 401 is in contact with the first limiting protrusion 4041, the limiting rod 5021 is aligned with the third limiting hole 101, and the limiting rod 5021 sequentially passes through the second limiting hole 405 and the third limiting hole 101 and is slidably connected to the cam 401 and the first steel substrate 1.

[0044] When the limit rod 5021 is inserted into the third limit hole 101, the cam 401 is fixed to the first steel substrate 1, so that the cam 401 cannot rotate, and the bolt 402 is locked to prevent the bolt 402 from moving during use. Through the cooperation of the limit rod 5021 and the second limit hole 405, the handle 502 can drive the cam 401 to rotate together when it rotates.

[0045] Furthermore, a first-stage sleeve 4012 is provided at the top of the cam 401, a second-stage sleeve 5022 is provided at the center of the lower end face of the handle 502, the second-stage sleeve 5022 is inserted into the first-stage sleeve 4012 and is slidably and sealingly connected thereto, and the piston button 503 is installed in the second-stage sleeve 5022 and is slidably and sealingly connected thereto. The first-stage sleeve 4012 and the second-stage sleeve 5022 are filled with hydraulic oil.

[0046] When the piston button 503 is pressed downward, the piston button 503 squeezes the hydraulic oil downward, increasing the pressure in the first-stage sleeve 4012, so that the second-stage sleeve slides upward, and the second-stage sleeve 5022 drives the handle 502 to move upward, so as to leak out from the dark groove 5011. After leaking out, there is a certain gap between the handle 502 and the turntable 501, so that a finger can pass through the gap to grasp the handle and rotate the turntable 501.

[0047] Furthermore, a first limit flange 4013 is provided at the edge of the inner end face of the first-stage sleeve 4012, and a second limit flange 5023 is provided at the outer end face of the bottom of the second-stage sleeve 5022.

[0048] The rising height of the handle 502 is limited by the cooperation of the first limit flange 4013 and the second limit flange 5023, so as to prevent the handle 502 from falling off during use, causing the board to fall, and ensuring the stability and safety of the handle 502.

[0049] Furthermore, the outer end faces of the first steel substrate 1 and the second steel substrate 3 are sprayed with an anti-corrosion coating, and the anti-corrosion coating is a nano-titanium dioxide coating.

[0050] The nano-titanium dioxide coating has strong redox ability under the action of visible light or ultraviolet light, has stable chemical properties, and can completely decompose harmful organic substances such as pollutants, bacteria, and microorganisms on the surface of the board into harmless CO2 and H2O, improving the anti-corrosion ability of the board.

[0051] In this embodiment, when installing the steel plate, first, gently press the piston button 503. Through the hydraulic system, the secondary sleeve 5022 moves upward, and the secondary sleeve 5022 drives the handle 502 to rise from the hidden groove 5011, so that the bottom of the limit rod 5021 slides from the third limit hole 101 to the second limit hole 405, releasing the limit on the cam 401. Hold the raised handle 502 by hand, place the building steel plate at the predetermined installation position, ensure alignment with the wall or other adjacent steel plates, and rotate the handle 502 clockwise. The handle 502 drives the turntable 501 and the cam 401 to transmit power, so that the raised part 4011 on the cam 401 presses the pulley 4021 at the bottom of the bolt 402. When the cam 401 rotates until the first limit surface 40411 fits with the raised part 4011, the four bolts 402 simultaneously extend with the assistance of the spring 403 and are inserted into the corresponding holes of the wall or other steel plates to complete the fixation. Then, push the handle 502 into the hidden groove 5011 so that the limit rod 5021 is inserted into the third limit hole 101. In this way, the cam 401 is locked and cannot rotate, ensuring that the bolt 402 is in an absolutely fixed state;

[0052] When the plate needs to be disassembled, gently press the piston button 503. Through the hydraulic system, the secondary sleeve 5022 moves upward, and the secondary sleeve 5022 drives the handle 502 to rise from the hidden groove 5011, so that the bottom of the limit rod 5021 slides from the third limit hole 101 to the second limit hole 405, releasing the limit on the cam 401. Hold the raised handle 502 by hand and rotate the handle 502 counterclockwise. The rotation of the cam 401 causes the raised part 4011 to fit with the second limit surface 40412, and the bottom of the bolt 402 is released from the limit. Under the action of the spring 403, it automatically retracts into the sound insulation structure board 2. Then, through the handle 502, remove the plate from the working position. After use, ensure that all components are in place, especially the handle 502 is completely stored to avoid deformation caused by the handle 502 being knocked. Regularly check the integrity of the nano-titanium dioxide coating and perform supplementary coating when necessary to maintain its anti-corrosion performance.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A corrosion-resistant building steel plate that is easy to disassemble and maintain, comprising a first steel base plate (1), a second steel base plate (3) and a sound insulation structural plate (2), wherein the sound insulation structural plate (2) is located between the first steel base plate (1) and the second steel base plate (3), and is characterized in that: A fixing mechanism (4) is provided in the sound insulation structural plate (2), and a gripping mechanism (5) is provided on the second steel base plate (3); The fixing mechanism (4) is fixedly mounted at the center of the sound insulation structural plate (2), the fixing mechanism (4) comprising a latch (402), a spring (403), a limiting ring (404) and a cam (401), and a pin hole (202) cooperating with the latch (402) is provided on the side surface of the sound insulation structural plate (2); The gripping mechanism (5) is fixedly mounted at the center of the second steel base plate (3), and the gripping mechanism (5) comprises a turntable (501), a handle (502) and a piston button (503); A through hole is provided at the center of the second steel base plate (3); the turntable (501) is mounted in the through hole and is rotatably connected to the second steel base plate (3) via a bearing; a dark groove (5011) is provided on the turntable (501) for receiving the handle (502); a first limiting hole (5012) is provided at the bottom of the dark groove (5011); a limiting rod (5021) is provided on the lower end surface of the handle (502); the handle (502) is inserted into the first limiting hole (5012) via the limiting rod (5021) to be slidably connected to the turntable (501); The cam (401) is provided with a second limiting hole (405) corresponding to the limiting rod (5021), the first steel base plate (1) is provided with a third limiting hole (101) corresponding to the limiting rod (5021), and the limiting rod (5021) passes through the second limiting hole (405) and the third limiting hole (101) in sequence to be slidably connected with the cam (401) and the first steel base plate (1); A primary sleeve (4012) is arranged at the top of the cam (401), a secondary sleeve (5022) is arranged at the center of the lower end surface of the handle (502), the secondary sleeve (5022) is inserted into the primary sleeve (4012) and is slidably and sealably connected thereto, the piston button (503) is installed in the secondary sleeve (5022) and is slidably and sealably connected thereto, and the primary sleeve (4012) and the secondary sleeve (5022) are filled with hydraulic oil.

2. A corrosion-resistant building steel plate that is easy to disassemble and maintain as claimed in claim 1, characterized in that: The limiting ring (404) is provided with a guide hole (4043), the latch (402) is inserted into the guide hole (4043) and is slidably connected to the limiting ring (404), the cam (401) is installed at the center of the limiting ring (404), the center of the lower end surface of the cam (401) is provided with an axial hole, the upper end surface of the bottom of the first steel base plate (1) is provided with a rotating shaft, the rotating shaft is inserted into the axial hole and is rotatably connected to the first steel base plate (1) through a bearing, the bottom of the latch (402) is provided with a pulley (4021) that fits the cam (401), the latch (402) is provided with a spring (403), the sound insulation structure plate (2) is provided with a sliding hole (201), the latch (402) is inserted into the sliding hole (201) and is elastically connected to the sound insulation structure plate (2) through the spring (403).

3. A corrosion-resistant building steel plate that is easy to disassemble and maintain as claimed in claim 2, characterized in that: The cam (401) is provided with a protrusion (4011) that fits with the pulley (4021), the number of the protrusions (4011) is four, and the four groups of the protrusions (4011) are arranged in an equidistant circular array, the number of the latch pins (402) is four, and the latch pins (402) and the pin holes (202) on the opposite sides thereof are on the same axis.

4. A corrosion-resistant building steel plate that is easy to disassemble and maintain as claimed in claim 3, characterized in that: The inner end surface of the limiting ring (404) is provided with a first limiting protrusion (4041), and the first limiting protrusion (4041) is provided with a first limiting surface (40411) and a second limiting surface (40412). When the protrusion (4011) is in contact with the first limiting surface (40411), the top of the latch (402) is flush with the side surface of the sound insulation structure plate (2), and when the protrusion (4011) is in contact with the second limiting surface (40412), the bottom of the latch (402) is completely received in the guide hole (4043).

5. The corrosion-resistant building steel plate that is easy to disassemble and maintain as claimed in claim 4, characterized in that: A second limiting protrusion (4042) is arranged inside the limiting ring (404), and a limiting groove corresponding to the shape of the protrusion (4011) is formed between the second limiting protrusion (4042) and the first limiting protrusion (4041).

6. The corrosion-resistant building steel plate that is easy to disassemble and maintain as claimed in claim 1, characterized in that: The inner end surface edge of the primary sleeve (4012) is provided with a first limiting flange (4013), and the bottom outer end surface of the secondary sleeve (5022) is provided with a second limiting flange (5023).

7. The corrosion-resistant building steel plate that is easy to disassemble and maintain as claimed in claim 1, characterized in that: The outer end surfaces of the first steel substrate (1) and the second steel substrate (3) are sprayed with anti-corrosion coating, and the anti-corrosion coating is nano titanium dioxide coating.

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