Foldable double-layer circuit board

Abstract

The application 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 the left and right sides of the mounting box are provided with first connecting frames, each first connecting frame is fixedly connected with a mounting circuit board inside, each first connecting frame is 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 installed in the round pipe box, a fire extinguishing mechanism is further fixedly installed between the first connecting frame and the mounting box, the fire extinguishing mechanism can extinguish fire and has the function of cooling, sand in the mounting box can be extruded to play a limiting and fixing role on all matching blocks, 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 board, and the two mounting circuit boards can be effectively limited.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit boards, in particular to a foldable double-layer circuit board. BACKGROUND

[0002] At present, electronic devices are constantly miniaturized and multifunctional, and the performance and structural design of circuit boards as core components are facing higher requirements. Traditional circuit boards are fixed by mechanical mechanisms such as screws and buckles, which can ensure a certain stability, but occupy space, increase the volume and weight of the device, and are not conducive to miniaturization and light weight. Moreover, in scenarios where the circuit board needs to be frequently disassembled and repaired, the mechanical fixing operation is tedious, increasing maintenance costs and time.

[0003] With the development of electronic technology, foldable circuit boards have emerged, which can be unfolded to provide more circuit layout space when needed, and folded to reduce the occupied space when not needed, greatly improving flexibility and adaptability. However, current foldable circuit boards mainly focus on the design of folding structure, and pay little attention to safety issues in actual use, especially fire prevention and extinguishing.

[0004] During the use of electronic devices, short circuits and overloads of circuit boards occur from time to time, and once a fire is triggered, not only the device is damaged, but also the surrounding environment and personnel safety are threatened. The foldable double-layer circuit board has a complex structure and high circuit density, and the risk of fire is even greater. Therefore, it is of great practical significance and market demand to develop a circuit board that combines folding and double-layer structure, effectively solves the fixing problem, and has fire extinguishing function.

[0005] Chinese patent (publication number CN209435547U) discloses a foldable double-layer circuit board, which comprises a first circuit board and a second circuit board. The right side center position of the first circuit board is screw-connected with one end of a folding mechanism, and the other end of the folding mechanism is screw-connected with the left side center position of the second circuit board. The folding mechanism comprises a base, and the left and right sides of the base are both welded with a support seat. The inner cavity of the support seat is axially connected with a column, and the left and right ends of the rear outer wall of the base are both provided with dovetail grooves along the left-right direction. The inner cavity of the dovetail groove is inserted with a slide block which can move left and right. The outer side rear end of the slide block is axially connected with one end of a connecting rod, and the other end of the connecting rod is axially connected with the rear center position of the column. The rear center position of the slide block is welded with a clamping block. This foldable double-layer circuit board can realize the folding of the first circuit board and the second circuit board, reduce the space occupation position, facilitate the installation of multiple circuit boards, and greatly meet the demand of circuit board installation.

[0006] According to the above scheme, the working principle can be known, the current folding circuit board can only realize simple folding to reduce the volume, but in actual operation, there are obvious deficiencies: one is that there is no effective limiting measure for the two circuit boards, which causes poor stability during use, and the other is that when the circuit board catches fire due to short circuit, there is no fire extinguishing function, which is easy to cause serious consequences and has limitations. SUMMARY

[0007] The present application aims to provide a foldable double-layer circuit board to solve the problems raised in the background art.

[0008] To achieve the above object, the present application provides the following technical scheme:

[0009] A foldable double-layer circuit board, comprising a mounting box, the mounting box is provided with a first connecting frame on the left and right sides, a mounting circuit board is fixedly connected inside each first connecting frame, and each first connecting frame is fixedly connected with the mounting box through a fixing mechanism, the upper end of the mounting box is also fixedly connected with a round pipe box, a driving mechanism for providing gas drive for the fixing mechanism is fixedly installed inside the round pipe box, a fire extinguishing mechanism is also fixedly installed between the first connecting frame and the mounting box, and the fire extinguishing mechanism can extinguish fire and has the function of cooling the mounting circuit board.

[0010] As a further embodiment of the present application, the driving mechanism comprises a folding air sleeve, the right end of the folding air sleeve is fixedly connected to the inner wall of the round pipe box, a threaded block is rotatably connected to the left end of the folding air sleeve, a threaded groove is further formed in the inner wall of the round pipe box, and the outer wall of the threaded block is threadedly connected with the inner wall of the threaded groove.

[0011] As a further embodiment of the present application, the threaded block is fixedly connected with a first telescopic rod at the end away from the folding air sleeve, and the first telescopic rod is rotatably connected with the outer wall of the round pipe box from left to right.

[0012] As a further embodiment of the present application, the fixing mechanism comprises two second connecting frames, the two second connecting frames are rotatably connected to the inner wall of the mounting box through a rotating shaft, each second connecting frame is fixedly connected with an adjacent first connecting frame, two connecting plates are fixedly connected to the inner wall of the mounting box, sand is filled in the inner part of the mounting box, and the outer wall of the second connecting frame penetrates the inner part of the connecting plate and the mounting box.

[0013] As a further embodiment of the present application, the end of the second connecting frame close to the inner wall of the mounting box is fixedly connected with a plurality of matching blocks, each second connecting frame is fixedly connected with an adjacent first connecting frame through a bolt, two abutting air sleeves are fixedly connected to the middle of the inner wall of the mounting box, and the two abutting air sleeves are fixedly communicated with the folding air sleeve through a rubber tube.

[0014] As a further aspect of the present solution, the opposite end of the two abutting air sleeves is fixedly connected with a first abutting plate, the bottom of the first abutting plate is fixedly connected with a triangular block, the inner wall bottom end of the mounting box is rotatably connected with two rotating plates, the outer wall of the rotating plate and the outer wall of the triangular block abut each other, and the outer wall of the rotating plate also abuts with the outer wall of the two connecting plates.

[0015] As a further aspect of the present solution, the extinguishing mechanism includes a storage box, the storage box is filled with a fire retardant, the storage box is fixedly connected to the outer wall of the mounting box, the inner wall of the storage box is also slidably connected with a piston plate with a reset function, and the abutting air sleeve and the storage box are fixedly communicated through a pipeline.

[0016] As a further aspect of the present solution, 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 with the bottom of the mounting circuit board, and the second abutting plate is fixedly communicated with the storage box through a pipeline.

[0017] As a further aspect of the present solution, the upper end of the first connecting frame is slidably connected with a moving strip, the upper end of the first connecting frame is fixedly connected with a connecting pipe, the connecting pipe is fixedly communicated with the second abutting plate through a pipeline, and a plurality of folding pipes are fixedly connected between the connecting pipe and the moving strip.

[0018] As a further aspect of the present solution, the outer wall of the folding pipe is fixedly connected with a plurality of first connecting blocks and second connecting blocks, the end of the second connecting block close to the first connecting block is fixedly connected with an elastic telescopic rod, the 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.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] 1、When the present application is used, the sand inside the mounting box is extruded, which can limit and fix all the cooperating blocks, the cooperating blocks in turn limit and fix the second connecting frame, and the second connecting frame can limit and fix the first connecting frame and the mounting circuit board, the two mounting circuit boards can not only be effectively limited, but also be adjusted to a suitable angle, this limiting and fixing method through sand extrusion can provide a simple and reliable limiting mechanism, compared with a complex mechanical limiting structure, the cost is lower, and the installation and maintenance are more convenient, on the other hand, the uniform extrusion of the sand can ensure that each connecting frame and circuit board is uniformly stressed, thereby enhancing the stability of the overall structure and greatly improving the working reliability of the circuit board.

[0021] 2、The invention uses when the trigger condition is reached, the blade will quickly cut the folded tube bottom, at this time, the flame retardant stored in the folded tube will flow out immediately, and the corresponding fire location below is fully poured out, which can accurately deliver the flame retardant to the fire source at the first time of the circuit board fire, quickly suppress the spread of fire, avoid serious damage to the circuit board and surrounding equipment caused by fire, and minimize economic losses, at the same time, this timely and effective fire extinguishing method can also reduce the safety risk caused by fire, and ensure the safety and stability of the equipment use environment. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0024] Figure 3 It is a structure schematic view of a driving mechanism in a foldable double-layer circuit board.

[0025] Figure 4 It is a schematic view of the internal structure of a mounting box in a foldable double-layer circuit board.

[0026] Figure 5 It is a schematic view of the cross section of a mounting box in a foldable double-layer circuit board.

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

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

[0029] Figure 8 It is a schematic view of the position structure of a moving strip in a foldable double-layer circuit board.

[0030] Figure 9 It is a schematic view of the position structure of a folding tube in a foldable double-layer circuit board.

[0031] Figure 10 It is a schematic view of the position structure of an elastic telescopic rod in a foldable double-layer circuit board.

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

[0033] In the figure: 1, mounting box; 2, first connecting frame; 3, mounting circuit board; 4, round 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, matching 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, sliding rod; 23, moving bar; 24, threaded coil pipe;

[0035] 25, first connecting block; 26, folding pipe; 27, second connecting block; 28, fuse block; 29, elastic telescopic rod; 30, blade; 101, driving mechanism; 201, fixing mechanism; 301, fire extinguishing mechanism. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] Embodiment one: please refer to Figures 1-2 As shown in the figure, in the embodiments of the present application, a foldable double-layer circuit board comprises a mounting box 1, the mounting box 1 is provided with a first connecting frame 2 on each of the left and right sides, each first connecting frame 2 is fixedly connected with a mounting circuit board 3 inside, and each first connecting frame 2 is fixedly connected with the mounting box 1 through a fixing mechanism 201, the upper end of the mounting box 1 is further fixedly connected with a round pipe box 4, the round pipe box 4 is fixedly installed with a driving mechanism 101 which can provide gas drive for the fixing mechanism 201, and the first connecting frame 2 and the mounting box 1 are further fixedly installed with a fire extinguishing mechanism 301 which can extinguish fire and has the function of cooling for the mounting circuit board 3.

[0038] Embodiment two: please refer to Figures 2-3 As shown in the figure, the driving mechanism 101 comprises a folding air sleeve 5, the right end of the folding air sleeve 5 is fixedly connected to the inner wall of the round pipe box 4, the folding air sleeve 5 is made of rubber material, the rubber material has good flexibility, can be folded and stretched conveniently, has good sealing property, can effectively prevent gas leakage, ensures normal use of the folding air sleeve 5, has a certain elasticity, can withstand a certain degree of pressure, increases 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 rotationally connected with a threaded block 9 through a rotating shaft, the threaded block 9 is a circular block with external spiral strips, the inside of the circular tube box 4 is also provided with a threaded groove 6, the outer wall of the threaded block 9 is threadedly connected with the inner wall of the threaded groove 6, the end of the threaded block 9 away from the folding air sleeve 5 is fixedly connected with a first telescopic rod 7, and the outer wall of the first telescopic rod 7 is rotationally connected with the outer wall of the circular tube box 4 from left to right, the first telescopic rod 7 can freely extend and retract along with the movement of the threaded block 9, the end of the first telescopic rod 7 away from the threaded block 9 is fixedly connected with a rotating block 8, the outer wall of the rotating block 8 is fixedly connected with a plurality of anti-skid strips, the plurality of anti-skid strips are circumferentially distributed on the outer wall of the rotating block 8, the rotating block 8 can facilitate the rotation of the first telescopic rod 7 by the staff, and the anti-skid strips can enhance the friction between the palm of the staff and the rotating block 8 to prevent slipping;

[0039] Please refer to Figures 3-5 As shown in the figure, the fixing mechanism 201 comprises two second connecting frames 12 rotationally connected in the inner wall of the mounting box 1, each second connecting frame 12 is fixedly connected with an adjacent first connecting frame 2, the two second connecting frames 12 are symmetrically distributed in the inner wall of the mounting box 1, the inner wall of the mounting box 1 is also fixedly connected with two connecting plates 10, and the two connecting plates 10 are symmetrically distributed in the left and right of the inner wall of the mounting box 1, the inside of the mounting box 1 is also filled with sand, and the sand is located between the two connecting plates 10, the outer wall of the second connecting frame 12 penetrates the inside of the connecting plate 10 and the mounting box 1, the end of the second connecting frame 12 close to the inner wall of the mounting box 1 is fixedly connected with a plurality of matching blocks 13, and the plurality of matching blocks 13 are arrayed on the outer wall of the second connecting frame 12, each second connecting frame 12 is fixedly connected with an adjacent first connecting frame 2 through a bolt, the inner wall of the mounting box 1 is also fixedly connected with two abutting air sleeves 15 in the middle, the two abutting air sleeves 15 are fixedly communicated with the folding air sleeve 5 through rubber tubes, the rubber tubes can be arbitrarily pulled and extended, and the abutting air sleeves 15 are also made of rubber material, which has the same effect as the rubber material of the folding air sleeve 5, and will not be described in detail here, and the two abutting air sleeves 15 are symmetrically distributed in the left and right of the inner wall of the mounting box 1;

[0040] The opposite end of each of the two abutting air sleeves 15 is fixedly connected with a first abutting plate 11, the bottom of the first abutting plate 11 is fixedly connected with a triangular block 17, the triangular block 17 is in the shape of a triangle, the bottom end of the inner wall of the mounting box 1 is rotationally connected with two rotating plates 16, the two rotating plates 16 are symmetrically distributed in the left and right of the bottom end of the inner wall of the mounting box 1, the outer wall of the rotating plate 16 abuts against the outer wall of the triangular block 17, and the outer wall of the rotating plate 16 also abuts against the outer wall of the two connecting plates 10;

[0041] Please refer to Figures 6-10As shown, the fire extinguishing mechanism 301 includes a storage box 14 filled with a fire retardant, which is a perfluorocyclohexanone extinguishing agent. The perfluorocyclohexanone is a clear, colorless, odorless liquid with stable chemical properties. It has good fluidity and can quickly flow and penetrate the surface of the installed circuit board 3. When sprayed onto the installed circuit board 3 on fire, the perfluorocyclohexanone extinguishing agent rapidly vaporizes, absorbs a large amount of heat, and reduces the flame temperature. The vaporized perfluorocyclohexanone dilutes the oxygen and flammable gas concentration in the combustion area, and at the same time, it can block the chain reaction of combustion. Due to its good electrical insulation, it will not cause short circuit damage to the installed circuit board 3, and it will not leave residue after extinguishing, and will not corrode the installed circuit board 3. It can effectively extinguish the installed circuit board 3 fire. The storage box 14 is fixedly connected to the outer wall of the mounting box 1. The inner wall of the storage box 14 is also slidably connected to the piston plate 19 with a reset function. The piston plate 19 is fixedly connected to the inner wall of the storage box 14. When the piston plate 19 moves, the piston plate 19 will lengthen the second elastic expansion arm 20 to store power. When the control of the piston plate 19 is released, the second elastic expansion arm 20 can quickly reset the piston plate 19. The outer wall of the piston plate 19 is also provided with a rubber strip, which is also made of rubber material. The outer wall of the rubber strip is in abutment with the inner wall of the storage box 14. The rubber strip has good elasticity and can enhance the sealing between the piston plate 19 and the inner wall of the storage box 14. The abutment sleeve 15 is fixedly connected to the storage box 14 through the pipeline. The bottom of the first connecting frame 2 is also fixedly connected to the second abutment plate 18. The upper end of the second abutment plate 18 is in abutment with the bottom of the installed circuit board 3. The second abutment plate 18 is fixedly connected to the storage box 14 through the pipeline. The upper end of the first connecting frame 2 is slidably connected to the moving strip 23.

[0042] Specifically, the upper end of the first connecting frame 2 is fixedly connected to two slide rods 22, and the two slide rods 22 are symmetrically distributed in front of and behind the upper end of the first connecting frame 2. The moving strip 23 is slidably connected to the outer walls of the two slide rods 22. The inner wall of the moving strip 23 and the outer walls of the two slide rods 22 are both coated with lubricating oil. When the moving strip 23 slides on the outer walls of the two slide rods 22, the two slide rods 22 can limit the moving strip 23 and also have a guiding effect, improving the stability of the moving strip 23 when moving. The lubricating oil can also reduce the friction between the moving strip 23 and the two slide rods 22, prolonging the service life of the slide 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 communicated with the second abutting plate 18 through a pipe, the connecting pipe 21 is located at the right side of the moving strip 23, a plurality of folding pipes 26 are fixedly connected between the connecting pipe 21 and the moving strip 23, the folding pipes 26 are made of perfluorinated rubber, the perfluorinated rubber can be used for a long time at about 300 DEG C and can resist high temperature up to 400 DEG C, the plurality of folding pipes 26 are symmetrically distributed in front and back between the connecting pipe 21 and the moving strip 23, specifically, the left and right ends of the folding pipe 26 are rotatably connected with threaded rotary pipes 24, and the moving strip 23 and the connecting pipe 21 are threadedly connected with the adjacent threaded rotary pipes 24, when one of the first connecting blocks 25 is damaged, the folding pipe 26 can be disassembled through the threaded rotary pipe 24, and the new folding pipe 26 is installed through the threaded rotary pipe 24, the outer wall of the folding pipe 26 is fixedly connected with a plurality of first connecting blocks 25 and second connecting blocks 27, every two adjacent second connecting blocks 27 and first connecting blocks 25 are symmetrically distributed on the outer wall of the folding pipe 26, the end of the second connecting block 27 close to the first connecting block 25 is fixedly connected with an elastic expansion rod 29, the end of the elastic expansion 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 material, the stainless steel material has good corrosion resistance and high temperature resistance characteristics, is durable, two fuse blocks 28 are fixedly connected between the elastic expansion rod 29 and the first connecting block 25, the fuse block 28 is made of butyronitrile rubber material, the butyronitrile rubber is polymerized from acrylonitrile and butadiene. The rubber pipe has good heat resistance and can work for a long time at a temperature of 100-120 DEG C, and the two fuse blocks 28 are symmetrically distributed in front and back between the elastic expansion rod 29 and the first connecting block 25.

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

[0045] When the two mounting circuit boards 3 need to be folded, only the two first connecting frames 2 need to be manually controlled to rotate, and when the two first connecting frames 2 rotate, the first connecting frame 2 drives 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 the appropriate angle, the rotating block 8 needs to be rotated, the rotating block 8 drives the threaded block 9 to rotate through the first telescopic rod 7, the threaded block 9 moves in the inner wall of the circular tube box 4 along the threaded groove 6, at this time, the threaded block 9 moves to extrude the folding air sleeve 5, the gas in the folding air sleeve 5 enters the two abutting air sleeves 15, when the gas enters the abutting air sleeve 15, the abutting air sleeve 15 expands to drive the first abutting plate 11 and the triangular block 17 to move, the first abutting plate 11 and the triangular block 17 move to the direction of the adjacent second connecting frame 12, which extrudes the gas in the mounting box 1, when the triangular block 17 moves, the rotating plate 16 moves on the outer wall of the triangular block 17, the rotating plate 16 rotates upward, at this time, the sand in the mounting box 1 is extruded, the sand limits and fixes all the matching blocks 13, the matching blocks 13 limit and fix the second connecting frame 12, and the second connecting frame 12 limits and fixes the first connecting frame 2 and the mounting circuit board 3;

[0046] When the gas enters the abutting air sleeve 15, the gas in the abutting air sleeve 15 also enters the storage box 14, the increase of the gas pressure in the storage box 14 moves the piston plate 19, the piston plate 19 moves to extrude the flame retardant, the flame retardant enters the second abutting plate 18, the second abutting plate 18 abuts the bottom of the mounting circuit board 3, which has a cooling effect on the mounting circuit board 3, and the flame retardant also enters the connecting pipe 21 through the second abutting plate 18, and then enters all the folding pipes 26 through the connecting pipe 21, the folding pipes 26 expand and lengthen to push the moving strip 23, when the folding pipes 26 lengthen, the distance between every two adjacent second connecting blocks 27 and first connecting blocks 25 becomes longer, and the elastic telescopic rod 29 is driven to lengthen and store energy, and when all the folding pipes 26 cover the mounting circuit board 3, the fixing and limiting of the two first connecting frames 2 are completed.

[0047] When the upper end of the first connecting frame 2 has a short circuit spark, the temperature will reach more than 100 degrees Celsius, at this time, the two fuse blocks 28 will be fused first, and the folding pipes 26 in the upper end are not affected due to the flame retardant, and after the fuse block 28 is fused, the elastic telescopic rod 29 drives the blade 30 to move, the blade 30 cuts the bottom of the folding pipe 26, the flame retardant in the folding pipe 26 extinguishes the flame at the corresponding position below, since the folding pipe 26 is cut, the gas in the storage box 14 pushes all the flame retardant in the interior to the second abutting plate 18 and the connecting pipe 21 through the piston plate 19, and then discharges from the connecting pipe 21 to the folding pipe 26, until the flame retardant is exhausted.

[0048] When in use, no short circuit occurs, and all the first connecting frames 2 need to be reset, at this time, the reverse direction is rotated, the rotating block 8 drives the first telescopic rod 7 and the threaded block 9 to rotate, the threaded block 9 resets and moves in the inner wall of the circular tube box 4, and the folding air sleeve 5 is pulled and reset, at this time, the folding air sleeve 5 performs a suction on the two abutting air sleeves 15 and the inside of the storage box 14, the abutting air sleeve 15 drives the first abutting plate 11 and the triangular block 17 to reset, the sand in the mounting box 1 is loose, the first connecting frame 2 can be reset, and when the piston plate 19 in the storage box 14 resets, the piston plate 19 can suction all the fire retardant back into the storage box 14, and the folding pipe 26 drives the moving strip 23 to reset and move, so that the second folding can be performed.

[0049] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0050] Obviously, the above-described embodiments are only some of the embodiments of the present application, but not all the embodiments. The preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the contents of the present application specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A foldable double-layer circuit board comprising a mounting box, characterized by, The first connecting frame is fixedly connected with the first circuit board, and the first connecting frame is fixedly connected with the storage box through a fixing mechanism. The first connecting frame is fixedly connected with the first circuit board, and the first connecting frame is fixedly connected with the storage box through a fixing mechanism. The bottom of the first connecting frame is fixedly connected with a second abutting plate, the upper end of the second abutting plate is in abutment with the bottom of the first circuit board, and the second abutting plate is fixedly communicated with the storage box through a pipeline. The upper end of the first connecting frame is slidably connected with a moving strip, the upper end of the first connecting frame is fixedly connected with a connecting pipe, the connecting pipe is fixedly communicated with the second abutting plate through a pipeline, and a plurality of folding pipes are fixedly connected between the connecting pipe and the moving strip. The outer wall of the folding pipe 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 fusing blocks are fixedly connected between the elastic telescopic rod and the first connecting block.

2. The foldable double-layered circuit board according to claim 1, wherein, The right end of the folding air sleeve is fixedly connected to the inner wall of the circular pipe box, the left end of the folding air sleeve is rotatably connected with a threaded block, and a threaded groove is formed in the inner wall of the circular pipe box.

3. The foldable double-layered circuit board according to claim 2, wherein, The outer wall of the first telescopic rod is rotatably connected to the outer wall of the circular pipe box from left to right.

4. The foldable double-layered circuit board according to claim 1, wherein, The fixing mechanism comprises two second connecting frames, the two second connecting frames are rotatably connected to the inner wall of the mounting box through a rotating shaft, each second connecting frame is fixedly connected with an adjacent first connecting frame, two connecting plates are fixedly connected to the inner wall of the mounting box, and the inner wall of the mounting box is filled with sand.

5. The foldable double-layered circuit board according to claim 1, wherein, The end of the second connecting frame close to the inner wall of the mounting box is fixedly connected with a plurality of matching blocks, each second connecting frame is fixedly connected with an adjacent first connecting frame through a bolt, the inner wall of the mounting box is fixedly connected with two abutting air sleeves in the middle, the two abutting air sleeves are fixedly communicated with the folding air sleeve through a rubber pipe, and the abutting air sleeve is fixedly communicated with the storage box through a pipeline.

6. The foldable double-layered circuit board according to claim 5, wherein, The bottom of the first connecting frame is fixedly connected with a second abutting plate, the upper end of the second abutting plate is in abutment with the bottom of the first circuit board, and the second abutting plate is fixedly communicated with the storage box through a pipeline. The outer wall of the folding pipe 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 fusing blocks are fixedly connected between the elastic telescopic rod and the first connecting block.

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