Foldable double-layer circuit board

Abstract

The invention relates to the technical field of circuit boards, in particular to a foldable double-layer circuit board which comprises a mounting box and is characterized in that first connecting frames are arranged on the left side and the right side of the mounting box, a mounting circuit board is fixedly connected into each first connecting frame, and each first connecting frame is further fixedly connected with the mounting box through a fixing mechanism; the upper end of the mounting box is further fixedly connected with a round pipe box, a driving mechanism capable of providing gas driving for the fixing mechanism is fixedly mounted in the round pipe box, a fire extinguishing mechanism is further fixedly mounted between the first connecting frame and the mounting box, and the fire extinguishing mechanism can extinguish fire of the mounted circuit board and also has a cooling function; after the sand is extruded, all the matching blocks can be limited and fixed, the matching blocks further limit and fix the second connecting frame, the second connecting frame can limit and fix the first connecting frame and the mounting circuit boards, and the two mounting circuit boards can be effectively limited.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit boards, and particularly to a foldable double-layer circuit board. Background Art

[0002] At present, as electronic devices are continuously miniaturized and multifunctionalized, the circuit board, as a core component, faces higher requirements in terms of its performance and structural design. Traditional circuit boards are fixed by mechanical mechanisms such as screws and buckles. Although they can ensure a certain degree of stability, they occupy space, increase the volume and weight of the device, which is not conducive to miniaturization and lightweight. Moreover, in scenarios where the circuit board needs to be frequently disassembled and repaired, the mechanical fixing operation is cumbersome, increasing the maintenance cost and time.

[0003] With the development of electronic technology, foldable circuit boards have emerged. They can be unfolded when needed to provide a larger circuit layout space and folded when not needed to reduce the occupied space, greatly improving flexibility and adaptability. However, at present, most foldable circuit boards only focus on the design of the folding structure and pay less attention to safety issues in actual use, especially fire prevention and extinguishing.

[0004] During the use of electronic devices, situations such as short circuits and overloads of the circuit board often occur. Once a fire is triggered, it not only damages the device but also threatens the safety of the surrounding environment and personnel. The foldable double-layer circuit board has a complex structure and a high circuit density, so the fire risk is greater. Therefore, it is of great practical significance and market demand to develop a circuit board that has both a foldable and double-layer structure, can effectively solve the fixing problem, and also has a fire extinguishing function.

[0005] Chinese Patent (Publication No. CN209435547U) discloses a foldable double-layer circuit board, which includes a first circuit board and a second circuit board. One end of a folding mechanism is screwed to the center position on the right side of the first circuit board, and the other end of the folding mechanism is screwed to the center position on the left side of the second circuit board. The folding mechanism includes a base. Support seats are welded to both the left and right sides of the base. A cylinder is axially connected to the inner cavity of the support seat. Dovetail grooves are formed in the left and right ends of the rear outer wall of the base along the left-right direction. Sliders that can move left and right are inserted into the outer sides of the dovetail grooves. One end of a connecting rod is axially connected to the outer side rear end of the slider, and the other end of the connecting rod is axially connected to the center position on the rear side of the cylinder. A clamping block is welded to the center position on the rear side of the slider. This foldable double-layer circuit board can fold the first circuit board and the second circuit board, reduce the occupied space position, and facilitate the installation of multiple circuit boards, greatly meeting the requirements for circuit board installation.

[0006] According to the above solution, based on the above working principle, the currently used foldable circuit board can only achieve simple folding to reduce the volume. However, in actual operation, there are obvious deficiencies: one is the lack of effective limiting measures for the two circuit boards, resulting in poor stability during use; the other is that when the circuit board catches fire due to a short circuit, there is no fire extinguishing function, which is likely to cause serious consequences and has limitations. To solve the above problems, we propose a foldable double-layer circuit board. Summary of the Invention

[0007] The purpose of the present invention is to provide a foldable double-layer circuit board to solve the problems raised in the above background technology.

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

[0009] A foldable double-layer circuit board includes an installation box. Both the left and right sides of the installation box are provided with first connecting frames. Inside each first connecting frame, an installation circuit board is fixedly connected. Each first connecting frame is also fixedly connected to the installation box through a fixing mechanism. The upper end of the installation box is also fixedly connected with a round tube box. Inside the round tube box, a driving mechanism that can provide gas drive for the fixing mechanism is fixedly installed. A fire extinguishing mechanism is also fixedly installed between the first connecting frame and the installation box. The fire extinguishing mechanism can extinguish fires on the installation circuit board and also has the function of cooling down.

[0010] Further, as for this solution, the driving mechanism includes a folding air sleeve. The right end of the folding air sleeve is fixedly connected to the inner wall of the round tube box. The left end of the folding air sleeve is rotatably connected to a threaded block. A threaded groove is also opened inside the round tube box. The outer wall of the threaded block is threadedly connected to the inner wall of the threaded groove.

[0011] Further, as for this solution, one end of the threaded block away from the folding air sleeve is fixedly connected with a first telescopic rod, and the outer wall of the first section of the first telescopic rod from left to right is rotatably connected to the outer wall of the round tube box.

[0012] Further, as for this solution, the fixing mechanism includes two second connecting frames. The two second connecting frames are rotatably connected to the inner wall of the installation box through a rotating shaft. Each second connecting frame is fixedly connected to an adjacent first connecting frame. Two connecting plates are also fixedly connected to the inner wall of the installation box. Sand is filled inside the installation box. The outer wall of the second connecting frame penetrates through the connecting plate and the inside of the installation box.

[0013] Further, as for this solution, several matching blocks are fixedly connected to one end of the second connecting frame close to the inner wall of the installation box. Each second connecting frame is fixedly connected to an adjacent first connecting frame through a bolt. Two abutting air sleeves are also fixedly connected to the center of the inner wall of the installation box. The two abutting air sleeves and the folding air sleeve are fixedly connected and communicated through a rubber tube.

[0014] As a further improvement of this solution, first contact plates are fixedly connected to opposite ends of the two contact air sleeves. A triangular block is fixedly connected to the bottom of the first contact plate. Two rotating plates are rotatably connected to the bottom end of the inner wall of the installation box. The outer wall of the rotating plate abuts against the outer wall of the triangular block, and the outer wall of the rotating plate also abuts against the outer walls of two connecting plates.

[0015] As a further improvement of this solution, the fire extinguishing mechanism includes a storage box filled with a flame retardant inside. The storage box is fixedly connected to the outer wall of the installation box. A piston plate with a reset function is also slidably connected to the inner wall of the storage box. The contact air sleeve and the storage box are fixedly connected and communicated through a pipeline.

[0016] As a further improvement of this solution, a second contact plate is also fixedly connected to the bottom of the first connecting frame. The upper end of the second contact plate abuts against the bottom of the installation circuit board. The second contact plate and the storage box are fixedly connected and communicated through a pipeline.

[0017] As a further improvement of this solution, a moving strip is slidably connected to the upper end of the first connecting frame. A connecting pipe is fixedly connected to the upper end of the first connecting frame. The connecting pipe and the second contact plate are fixedly connected and communicated through a pipeline. A number of folding pipes are fixedly connected between the connecting pipe and the moving strip.

[0018] As a further improvement of this solution, a number of first connecting blocks and second connecting blocks are fixedly connected to the outer wall of the folding pipe. An elastic telescopic rod is fixedly connected to one end of the second connecting block close to the first connecting block. A blade is fixedly connected to the end of the elastic telescopic rod away from the second connecting block. Two fusing blocks are fixedly connected between the elastic telescopic rod and the first connecting block.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. When the present invention is in use, inside the installation box, after the sand is squeezed, it will play a role in limiting and fixing all the matching blocks. The matching blocks will then limit and fix the second connecting frame, and the second connecting frame can in turn limit and fix the first connecting frame and the installation circuit board. The two installation circuit boards can not only be effectively limited but also be adjusted to a suitable angle. This method of achieving limit fixation by squeezing sand provides, on the one hand, a simple and reliable limit mechanism, which has a lower cost and is more convenient for installation and maintenance compared to complex mechanical limit structures. On the other hand, the uniform squeezing of the sand can ensure that each connecting frame and circuit board are evenly stressed, enhancing the stability of the overall structure and greatly improving the working reliability of the circuit board.

[0021] 2. When the present invention is in use, when the triggering condition is reached, the blade will quickly cut open the bottom of the folding tube. At this time, the flame retardant stored inside the folding tube will immediately flow out, thoroughly extinguishing and retarding the fire at the corresponding fire location below. It can accurately deliver the flame retardant to the fire source at the first moment when the circuit board catches fire, quickly suppress the spread of the fire, avoid serious damage to the circuit board and surrounding equipment caused by the fire, minimize economic losses to the greatest extent. At the same time, this timely and effective fire extinguishing method can also reduce the safety risks caused by the fire and ensure the safety and stability of the equipment usage environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the front view of a foldable double - layer circuit board.

[0023] Figure 2 is the top view of a foldable double - layer circuit board.

[0024] Figure 3 is the structural schematic diagram of the driving mechanism in a foldable double - layer circuit board.

[0025] Figure 4 is the internal structural schematic diagram of the installation box in a foldable double - layer circuit board.

[0026] Figure 5 is the sectional schematic diagram of the installation box in a foldable double - layer circuit board.

[0027] Figure 6 is the top view of the installation box in a foldable double - layer circuit board.

[0028] Figure 7 is the internal structural schematic diagram of the storage box in a foldable double - layer circuit board.

[0029] Figure 8 is the positional structural schematic diagram of the moving bar in a foldable double - layer circuit board.

[0030] Figure 9 is the positional structural schematic diagram of the folding tube in a foldable double - layer circuit board.

[0031] Figure 10 is the positional structural schematic diagram of the elastic telescopic rod in a foldable double - layer circuit board.

[0032] Figure 11 is the top view of the first connecting block in a foldable double - layer circuit board.

[0033] In the figure: 1. Installation box; 2. First connecting frame; 3. Installed circuit board; 4. Circular tube box; 5. Folding air sleeve; 6. Threaded groove; 7. First telescopic rod; 8. Rotating block; 9. Threaded block; 10. Connecting plate; 11. First abutting plate;

[0034] 12. Second connecting frame; 13. Fitting block; 14. Storage box; 15. Abutting air sleeve; 16. Rotating plate; 17. Triangular block; 18. Second abutting plate; 19. Piston plate; 20. Second elastic telescopic arm; 21. Connecting pipe; 22. Slide bar; 23. Moving strip; 24. Threaded coil tube;

[0035] 25. First connecting block; 26. Folding tube; 27. Second connecting block; 28. Fuse block; 29. Elastic telescopic rod; 30. Blade; 101. Driving mechanism; 201. Fixing mechanism; 301. Fire extinguishing mechanism. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiment 1: Please refer to Figures 1 to 2 As shown, in the embodiment of the present invention, a foldable double-layer circuit board includes an installation box 1. First connecting frames 2 are arranged on both the left and right sides of the installation box 1. An installation circuit board 3 is fixedly connected inside each first connecting frame 2. Each first connecting frame 2 is also fixedly connected to the installation box 1 through a fixing mechanism 201. A round tube box 4 is fixedly connected to the upper end of the installation box 1. A driving mechanism 101 capable of providing gas drive for the fixing mechanism 201 is fixedly installed inside the round tube box 4. A fire extinguishing mechanism 301 is also fixedly installed between the first connecting frame 2 and the installation box 1. The fire extinguishing mechanism 301 can extinguish the fire on the installation circuit board 3 and also has the function of cooling.

[0038] Embodiment 2: Please refer to Figures 2 to 3 As shown, the driving mechanism 101 includes a folding air sleeve 5. The right end of the folding air sleeve 5 is fixedly connected to the inner wall of the round tube box 4. The folding air sleeve 5 is made of rubber material. The rubber material has good flexibility, which can be easily folded and stretched. The rubber has good sealing performance, which can effectively prevent gas leakage and ensure the normal use of the folding air sleeve 5. It also has a certain elasticity and can withstand a certain degree of pressure, increasing the durability of the air sleeve. And the rubber material has relatively low cost. (Please refer to Figure 3) The left end of the folding air sleeve 5 is rotatably connected to a threaded block 9 through a rotating shaft. The threaded block 9 is a round block with spiral strips on the outside. A threaded groove 6 is also provided inside the round tube box 4. The outer wall of the threaded block 9 is threadedly connected to the inner wall of the threaded groove 6. One end of the threaded block 9 away from the folding air sleeve 5 is fixedly connected to a first telescopic rod 7. The outer wall of the first section of the first telescopic rod 7 from left to right is rotatably connected to the outer wall of the round tube box 4. The first telescopic rod 7 can freely expand and contract as the threaded block 9 moves. One end of the first telescopic rod 7 away from the threaded block 9 is fixedly connected to a rotating block 8. A number of anti-slip strips are fixedly connected to the outer wall of the rotating block 8. The number of anti-slip strips is circumferentially distributed on the outer wall of the rotating block 8. The rotating block 8 can facilitate the staff to rotate the first telescopic rod 7. The anti-slip strips can enhance the friction between the staff's palm and the rotating block 8 and prevent slipping;

[0039] Please refer to Figures 3 to 5 As shown in the figure, the fixing mechanism 201 includes two second connecting frames 12. The two second connecting frames 12 are rotatably connected to the inner wall of the installation box 1 through rotating shafts. Each second connecting frame 12 is fixedly connected to an adjacent first connecting frame 2. The two second connecting frames 12 are symmetrically distributed front and back in the inner wall of the installation box 1. Two connecting plates 10 are also fixedly connected to the inner wall of the installation box 1. The two connecting plates 10 are symmetrically distributed left and right in the inner wall of the installation box 1. Sand is filled in the installation box 1. The sand is located between the two connecting plates 10. The outer wall of the second connecting frame 12 penetrates through the connecting plate 10 and the inside of the installation box 1. A number of matching blocks 13 are fixedly connected to one end of the second connecting frame 12 close to the inner wall of the installation box 1. The number of matching blocks 13 is arranged in a left-right array on the outer wall of the second connecting frame 12. Each second connecting frame 12 is fixedly connected to an adjacent first connecting frame 2 through bolts. Two abutting air sleeves 15 are also fixedly connected to the center of the inner wall of the installation box 1. The two abutting air sleeves 15 and the folding air sleeve 5 are fixedly connected and communicated through a rubber tube. The rubber tube can be pulled and extended at will. The abutting air sleeve 15 is also made of rubber material. Its function is the same as that of the rubber material of the folding air sleeve 5 mentioned above and will not be elaborated here. The two abutting air sleeves 15 are symmetrically distributed left and right in the inner wall of the installation box 1;

[0040] One end of each of the two abutting air sleeves 15 is fixedly connected to a first abutting plate 11. A triangular block 17 is fixedly connected to the bottom of the first abutting plate 11. The triangular block 17 is in a "triangular shape". Two rotating plates 16 are rotatably connected to the bottom end of the inner wall of the installation box 1. The two rotating plates 16 are symmetrically distributed left and right at the bottom end of the inner wall of the installation box 1. The outer wall of the rotating plate 16 abuts against the outer wall of the triangular block 17. The outer wall of the rotating plate 16 also abuts against the outer walls of the two connecting plates 10;

[0041] Please refer to Figures 6 to 10As shown in the figure, the fire extinguishing mechanism 301 includes a storage box 14 filled with a flame retardant inside. The flame retardant uses perfluoroketone fire extinguishing agent. Perfluoroketone is a clear, colorless, and odorless liquid with stable chemical properties. It has good fluidity and can quickly flow and penetrate on the surface of the mounting circuit board 3. When sprayed onto the burning mounting circuit board 3, the perfluoroketone fire extinguishing agent quickly vaporizes, absorbs a large amount of heat, reduces the flame temperature. The vaporized perfluoroketone will dilute the oxygen and combustible gas concentrations in the combustion area. At the same time, it can block the chain reaction of combustion. Due to its good electrical insulation, it will not cause damage such as short circuit to the mounting circuit board 3, and there is no residue left after extinguishing the fire, nor will it corrode the mounting circuit board 3, and it can effectively extinguish the fire on the mounting circuit board 3. The storage box 14 is fixedly connected to the outer wall of the mounting box 1. A piston plate 19 with a reset function is also slidably connected to the inner wall of the storage box 14. A second elastic telescopic arm 20 is fixedly connected between the piston plate 19 and the inner wall of the storage box 14. When the piston plate 19 moves, the piston plate 19 will stretch and store energy for the second elastic telescopic arm 20. When the control of the piston plate 19 is released, the second elastic telescopic arm 20 can quickly reset the piston plate 19. A rubber strip is also provided on the outer wall of the piston plate 19. The rubber strip also uses rubber material. The outer wall of the rubber strip abuts against the inner wall of the storage box 14. The rubber strip has good elasticity, and the rubber strip can also enhance the sealing performance between the piston plate 19 and the inner wall of the storage box 14. The butting air sleeve 15 is fixedly connected to the storage box 14 through a pipeline. The bottom of the first connecting frame 2 is also fixedly connected with a second butting plate 18. The upper end of the second butting plate 18 abuts against the bottom of the mounting circuit board 3. The second butting plate 18 is fixedly connected to the storage box 14 through a pipeline. A moving strip 23 is slidably connected to the upper end of the first connecting frame 2;

[0042] Specifically, two sliding rods 22 are fixedly connected to the upper end of the first connecting frame 2, and the two sliding rods 22 are symmetrically distributed front and back at the upper end of the first connecting frame 2. The moving strip 23 is slidably connected to the outer walls of the two sliding rods 22. Lubricating oil is applied to the inside of the moving strip 23 and the outer walls of the two sliding rods 22. When the moving strip 23 slides on the outer walls of the two sliding rods 22, the two sliding rods 22 can limit the moving strip 23 and also have a guiding effect, improving the stability of the moving strip 23 when it moves. The lubricating oil can also reduce the friction between the moving strip 23 and the two sliding rods 22, extending the service life of the sliding rods 22 and the moving strip 23, and being durable;

[0043] The upper end of the first connecting frame 2 is fixedly connected with a connecting pipe 21. The connecting pipe 21 is fixedly and communicatively connected with the second abutting plate 18 through a pipeline. The connecting pipe 21 is located on the right side of the moving strip 23. A number of folding pipes 26 are fixedly connected between the connecting pipe 21 and the moving strip 23. The folding pipes 26 are made of perfluororubber, which can be used for a long time at about 300 °C and can withstand high temperatures up to 400 °C. The number of folding pipes 26 is symmetrically distributed front and back between the connecting pipe 21 and the moving strip 23. Specifically, both the left and right ends of the folding pipe 26 are rotatably connected with threaded spiral pipes 24, and both the moving strip 23 and the connecting pipe 21 are threadedly connected with the adjacent threaded spiral pipes 24. When one of the first connecting blocks 25 is damaged, the folding pipe 26 can be disassembled through the threaded spiral pipe 24, and then a new folding pipe 26 can be installed through the threaded spiral pipe 24. A number of first connecting blocks 25 and second connecting blocks 27 are fixedly connected to the outer wall of the folding pipe 26. Every two adjacent second connecting blocks 27 and first connecting blocks 25 are symmetrically distributed left and right on the outer wall of the folding pipe 26. One end of the second connecting block 27 close to the first connecting block 25 is fixedly connected with an elastic telescopic rod 29. One end of the elastic telescopic rod 29 away from the second connecting block 27 is fixedly connected with a blade 30, and the blade 30 is made of stainless steel. The stainless steel material has good corrosion resistance and high temperature resistance characteristics and is durable. Two fusing blocks 28 are fixedly connected between the elastic telescopic rod 29 and the first connecting block 25. The fusing blocks 28 are made of nitrile rubber material, and nitrile rubber is polymerized from acrylonitrile and butadiene. This rubber tube has good heat resistance and can usually work for a long time in the temperature range of 100-120 °C. The two fusing blocks 28 are symmetrically distributed front and back between the elastic telescopic rod 29 and the first connecting block 25.

[0044] The working principle of the present invention is:

[0045] When the present invention is in use, when it is necessary to fold two mounting circuit boards 3, only need to manually control the rotation of two first connecting frames 2. When the two first connecting frames 2 rotate, the first connecting frame 2 will drive all the matching blocks 13 to rotate through the second connecting frame 12. When the two mounting boxes 1 and the first connecting frame 2 are adjusted to an appropriate angle, it is necessary to rotate the rotating block 8. The rotating block 8 will drive the threaded block 9 to rotate through the first telescopic rod 7. The threaded block 9 will move along the threaded groove 6 on the inner wall of the round tube box 4. At this time, when the threaded block 9 moves, it will squeeze the folding air sleeve 5. The gas inside the folding air sleeve 5 will enter into the two abutting air sleeves 15. When the gas enters the abutting air sleeve 15, the expansion of the abutting air sleeve 15 will drive the first abutting plate 11 and the triangular block 17 to move. The first abutting plate 11 and the triangular block 17 will move towards the adjacent second connecting frame 12 direction, and will squeeze the gas inside the mounting box 1. When the triangular block 17 moves, the rotating plate 16 will move on the outer wall of the triangular block 17, and the rotating plate 16 will rotate upward. At this time, the sand inside the mounting box 1 will be squeezed, and the sand will limit and fix all the matching blocks 13. The matching blocks 13 will limit and fix the second connecting frame 12, and the second connecting frame 12 will limit and fix the first connecting frame 2 and the mounting circuit board 3;

[0046] When the gas enters the abutting air sleeve 15, the gas inside the abutting air sleeve 15 will also enter into the storage box 14. The increased air pressure inside the storage box 14 will move the piston plate 19. The movement of the piston plate 19 will squeeze the flame retardant. The flame retardant will enter into the second abutting plate 18. The second abutting plate 18 abuts against the bottom of the mounting circuit board 3, which can cool down the mounting circuit board 3, and the flame retardant will also enter into the connecting pipe 21 through the second abutting plate 18, and then enter into all the folding pipes 26 through the connecting pipe 21. The expansion and elongation of the folding pipes 26 will push the moving strip 23. When the folding pipes 26 extend, the distance between every two adjacent second connecting blocks 27 and the first connecting block 25 will become longer, and the elastic telescopic rod 29 will be driven to stretch and store energy. When all the folding pipes 26 cover the mounting circuit board 3, the fixing and limiting of the two first connecting frames 2 can be completed;

[0047] When a short circuit and spark occur at the upper end of the first connecting frame 2, the temperature will reach above one hundred degrees Celsius. At this time, the two fusing blocks 28 will be melted first. Due to the presence of the flame retardant inside the upper folding pipe 26, it will not be affected. And after the fusing blocks 28 are melted, the elastic telescopic rod 29 will drive the blade 30 to move. The blade 30 will cut open the bottom of the folding pipe 26. The flame retardant inside the folding pipe 26 will extinguish and retard the fire at the corresponding position below. Since the folding pipe 26 is cut open, the gas inside the storage box 14 will push all the flame retardant inside through the piston plate 19 into the second abutting plate 18 and the connecting pipe 21, and then discharge from the connecting pipe 21 through the folding pipe 26 until the flame retardant is exhausted;

[0048] When there is no short circuit during use and all the first connecting frames 2 need to be reset, rotate the rotating block 8 in the reverse direction at this time. The rotating block 8 will drive the first telescopic rod 7 and the threaded block 9 to rotate. The threaded block 9 will reset and move in the inner wall of the round tube box 4 to pull and reset the folding air sleeve 5. At this time, the folding air sleeve 5 will suck the two abutting air sleeves 15 and the inside of the storage box 14. The abutting air sleeve 15 will drive the first abutting plate 11 and the triangular block 17 to reset. The sand inside the installation box 1 will become loose, and the first connecting frame 2 can be reset. When the piston plate 19 inside the storage box 14 resets, the piston plate 19 will suck all the flame retardant back into the storage box 14. The folding tube 26 drives the moving strip 23 to reset and move, and the second folding can be carried out.

[0049] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium. It can be the connection inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the drawings, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present invention in other related technical fields is equally within the scope of the patent protection of the present invention.

Claims

1. A foldable double-layer circuit board, comprising a mounting box, characterized in that: The installation box is provided with a first connecting frame on both sides of the left and right sides, and a mounting circuit board is fixedly connected inside each of the first connecting frames. Each of the first connecting frames is also fixedly connected to the installation box through a fixing mechanism. A round tube box is also fixedly connected to the upper end of the installation box, and a driving mechanism that can provide gas drive to the fixing mechanism is fixedly installed inside the round tube box. A fire extinguishing mechanism is also fixedly installed between the first connecting frame and the installation box, and the fire extinguishing mechanism can extinguish the fire of the installation circuit board and also has the function of cooling.

2. A foldable double-layer circuit board according to claim 1, characterized in that: The driving mechanism includes a folding air sleeve, the right end of which is fixedly connected to the inner wall of the circular tube box, the left end of which is rotatably connected to a threaded block, a threaded groove is also provided inside the circular tube box, and the outer wall of the threaded block is threadedly connected to the inner wall of the threaded groove.

3. A foldable double-layer circuit board according to claim 2, characterized in that: One end of the threaded block away from the folding air sleeve is fixedly connected with a first telescopic rod, and the first section outer wall of the first telescopic rod from left to right is rotatably connected with the outer wall of the circular tube box.

4. The foldable double-layer circuit board according to claim 1, characterized in that: The fixing mechanism includes two second connecting frames, which are rotatably connected to the inner wall of the installation box through a rotating shaft, and each of the second connecting frames is fixedly connected to an adjacent first connecting frame. Two connecting plates are also fixedly connected to the inner wall of the installation box. The interior of the installation box is also filled with sand, and the outer wall of the second connecting frame passes through the connecting plate and the interior of the installation box.

5. The foldable double-layer circuit board according to claim 4, characterized in that: One end of the second connecting frame close to the inner wall of the installation box is fixedly connected with a plurality of matching blocks, each of the second connecting frames is fixedly connected to an adjacent first connecting frame by bolts, and two abutting air sleeves are also fixedly connected in the middle of the inner wall of the installation box, and the two abutting air sleeves are fixedly connected to the folding air sleeve by rubber tubes.

6. The foldable double-layer circuit board according to claim 5, characterized in that: The opposite ends of the two abutment air sleeves are fixedly connected with a first abutment plate, the bottom of the first abutment plate is fixedly connected with a triangular block, the bottom end of the inner wall of the installation box is rotatably connected with two rotating plates, the outer wall of the rotating plate abuts against the outer wall of the triangular block, and the outer wall of the rotating plate also abuts against the outer walls of the two connecting plates.

7. The foldable double-layer circuit board according to claim 5, characterized in that: The fire extinguishing mechanism includes a storage box filled with flame retardant, the storage box is fixedly connected to the outer wall of the installation box, the inner wall of the storage box is also slidably connected to a piston plate with a reset function, and the abutting air sleeve is fixedly connected to the storage box through a pipeline.

8. The foldable double-layer circuit board according to claim 7, characterized in that: The bottom of the first connecting frame is also fixedly connected with a second abutting plate, the upper end of the second abutting plate abuts against the bottom of the mounting circuit board, and the second abutting plate is fixedly connected to the storage box through a pipeline.

9. The foldable double-layer circuit board according to claim 8, characterized in that: The upper end of the first connecting frame is slidably connected to a moving bar, the upper end of the first connecting frame is fixedly connected to a connecting pipe, the connecting pipe is fixedly connected to the second abutting plate through a pipeline, and a plurality of folding tubes are fixedly connected between the connecting pipe and the moving bar.

10. The foldable double-layer circuit board according to claim 9, characterized in that: The outer wall of the folding tube is fixedly connected with a plurality of first connecting blocks and second connecting blocks, one end of the second connecting block close to the first connecting block is fixedly connected with an elastic telescopic rod, one end of the elastic telescopic rod away from the second connecting block is fixedly connected with a blade, and two fuse blocks are fixedly connected between the elastic telescopic rod and the first connecting block.

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