Composite printed circuit board

Abstract

The utility model discloses a composite printed circuit board which comprises a rectangular frame and a circuit board body, when the composite printed circuit board is used, two poke rods are pushed to move upwards, adjacent limiting blocks are driven to overcome the resistance of second springs to move upwards, two insertion rods are driven to be separated from inner cavities of adjacent blind holes, and then the rectangular frame and the circuit board body are pushed to move upwards. The method comprises the following steps of: pulling two bottom plates to be far away from each other, so that the bottom of a rectangular frame is in an open state, then pulling two first T-shaped rods to drive two first limiting plates to overcome the resistance of a first spring to move towards two sides, so that two supporting plates are separated from a circuit board body, then turning over the circuit board body, and loosening the two first T-shaped rods, so that the bottom of the rectangular frame is in an open state. According to the composite printed circuit board, the tops of the two supporting plates are attached to the bottom of the circuit board body and limit and support the circuit board body, and then the two bottom plates are reset, so that the composite printed circuit board is assembled, the operation is convenient, and the service life of the printed circuit board is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of printed circuit boards, in particular to a composite printed circuit board. Background Art

[0002] Printed circuit boards, also known as printed circuit boards, are providers of electrical connections for electronic components. According to the number of layers on the circuit boards, they can be divided into single-sided boards, double-sided boards, four-layer boards, six-layer boards and other multi-layer circuit boards. The main advantage of using circuit boards is that they greatly reduce wiring and assembly errors, and improve the level of automation and production labor rates.

[0003] When the existing printed circuit boards are stored with the bare surface, their surfaces are easily scratched and damaged, which in turn affects the normal use of the circuit boards. In addition, such printed circuit boards generally do not have a heat dissipation function, which easily causes the printed circuit boards to burn out, affecting the use of the printed circuit boards. Utility Model Content

[0004] The technical problem solved by the utility model is to overcome the defects of the prior art and provide a composite printed circuit board.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a composite printed circuit board, comprising a rectangular frame and a circuit board body, the circuit board body is located at the top of the inner cavity of the rectangular frame, and the middle positions of the front and rear sides of the circuit board body are fixedly connected with movable shafts, the ends of the two movable shafts that are far away are rotatably connected with connecting plates, and the sides of the two connecting plates that are far away are respectively fixedly connected with the front and rear sides of the inner cavity of the rectangular frame, and T-shaped slide grooves are opened on the outer walls around the rectangular frame near the bottom, and the inner cavity of the T-shaped slide groove is movably connected with two T-shaped sliders, and a plurality of the T-shaped sliders are far away from the rectangular frame. A positioning plate is fixedly connected to one side of the frame, and a positioning hole is opened on the positioning plate. Two mounting plates are fixedly connected to the top of the circuit board body, and the two mounting plates are arranged on the left and right. A mounting frame is jointly fitted on adjacent sides of the two mounting plates, and a clamping mechanism is provided between the mounting frame and the two mounting plates. A circular plate is fitted on the top and bottom of the inner cavity of the mounting frame, and a dust filter is fixedly connected to the inner cavity of the circular plate. A limiting mechanism is provided between the two sides of the circular plates away from each other and the mounting frame. A fan is provided at the middle position of the inner cavity of the mounting frame, and a positioning mechanism is provided on the outer side of the fan.

[0006] Preferably, support plates are fitted on both left and right sides of the bottom of the circuit board body, rectangular grooves are opened on both left and right sides of the inner cavity of the rectangular frame near the top, and the inner cavity of the rectangular groove is movably connected with a first limit plate, the two sides of the support plates respectively extend to the adjacent rectangular groove inner cavities, and are respectively fixedly connected to the adjacent first limit plates, first through holes are opened on both left and right sides of the rectangular frame near the top, and the first through hole inner cavity is connected to the rectangular groove inner cavity, a first T-shaped rod is passed through the two first through hole inner cavities, and the longer end of the T-shaped structure of the first T-shaped rod is fixedly connected to the adjacent first limit plate, a first spring is sleeved on the outer side of the two first T-shaped rods, and the two ends of the first spring are respectively fixedly connected to the inner side wall of the rectangular groove and the first limit plate.

[0007] Preferably, the bottom of the rectangular frame is fitted with two bottom plates, and the two bottom plates are fitted on the left and right, the tops of the two bottom plates are provided with a first slide groove, and the inner cavity of the first slide groove is movably connected with a first slider, the tops of the two first sliders are fixedly connected to the left and right sides of the bottom of the rectangular frame respectively, the rectangular frame is provided with a cavity near the left and right sides, and a limited slot is provided on the side of the cavity away from the center of the inner cavity of the rectangular frame, the inner cavities of the two cavities are fitted with limit blocks, and the bottoms of the limit blocks are fixedly connected with a plug rod, and the bottoms of the two cavities are provided with There is a second through hole, and the inner cavity of the second through hole is connected to the inner cavity of the first slide groove, a third through hole is opened on the two first sliding blocks, and a blind hole is opened on the side away from the bottom of the inner cavity of the two first slide grooves. The bottom ends of the two insertion rods respectively pass through the adjacent second through hole and the third through hole, and are respectively inserted in the adjacent blind hole cavities. The outer sides of the two insertion rods are sleeved with a second spring, and the two ends of the second spring are respectively fixedly connected to the limit block and the bottom of the inner cavity of the cavity, and the two limit blocks are fixedly connected to a toggle rod on the side away from the inner cavity, and the other end of the toggle rod passes through the inner cavity of the limit slot.

[0008] Preferably, brushes are fixedly connected to adjacent sides of the tops of the two bottom plates, and the length of the brushes is consistent with the width of the circular plate.

[0009] Preferably, the clamping mechanism includes two second sliders, and the two second sliders are respectively fixedly connected to the left and right sides of the mounting frame, a second slide groove is provided at the top of the adjacent side of the two mounting plates, and the top of the second slide groove is open, the two second sliders are movably connected to the adjacent second slide groove cavities, a fourth through-hole is provided near the top of the side away from the two mounting plates, and the fourth through-hole inner cavity is communicated with the second slide groove inner cavity, the two fourth through-hole inner cavities are penetrated by a second T-rod, and the bottom of the longer end of the T-shaped structure of the second T-rod is fitted with the top of the adjacent second slider, a third spring is sleeved on the outer side of the two second T-rods, and the two ends of the third spring are respectively fixedly connected to the second T-rod and the mounting plate.

[0010] Preferably, the limiting mechanism includes two second limiting plates, and the two second limiting plates are respectively fitted and arranged on the left and right sides of the circular plate away from the center of the inner cavity of the installation frame, the two second limiting plates are fixedly connected with a movable block on the side away from each other, and a third slider is provided on the side of the movable block close to the center of the inner cavity of the installation frame, and third slide grooves are provided on the left and right sides of the top and bottom of the installation frame, and the two third sliders are respectively movably connected to adjacent third slide groove cavities, and the two third slide groove cavities are fixedly connected with a fourth spring on the side away from each other, and the other end of the fourth spring is fixedly connected to the adjacent third slider.

[0011] Preferably, the positioning mechanism includes two circular plates, and the two circular plates are respectively fixedly connected at the middle position of the adjacent sides of the two dust filters, an annular groove is opened on the adjacent sides of the two circular plates, and sliding rods are inserted at the left and right sides of the inner cavity of the annular groove, and the ends of several sliding rods away from the adjacent circular plates are respectively fixedly connected to the top and bottom of the fan.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model improves the safety of the printed circuit board during storage by placing the front side of the circuit board body toward the inner cavity of the rectangular frame, thereby preventing the printed circuit board from being damaged by scratches. When it is needed to be used, first, the two toggle rods are pushed upward to drive the adjacent limit blocks to overcome the resistance of the second spring and move upward, and drive the two insertion rods to disengage from the adjacent blind hole inner cavities, then, the two bottom plates are pulled away from each other, so that the bottom of the rectangular frame is in an open state, then, the two first T-shaped rods are pulled to drive the two first limit plates to overcome the resistance of the first spring and move to both sides, and the two support plates are separated from the circuit board body, then, the circuit board body is turned over, and the two first T-shaped rods are loosened, so that the tops of the two support plates are attached to the bottom of the circuit board body and limitedly supported, and then, the two bottom plates are reset, so that the composite printed circuit board is assembled, which is convenient to operate and prolongs the service life of the printed circuit board;

[0014] 2. The utility model facilitates the clamping and fixing of the mounting frame at the middle position of the back side of the circuit board body through the mutual cooperation among the mounting plate, the second slider, the second slide groove, the second T-shaped rod and the third spring, and facilitates the clamping and fixing of the fan at the middle position of the back side of the circuit board body through the mutual cooperation among the return plate, the dust filter, the second limit plate, the movable block, the third slider, the third slide groove, the fourth spring, the circular plate and the sliding rod, so that when the printed circuit board is assembled and used, the fan rotates at the bottom thereof to blow air, thereby improving the heat dissipation efficiency of the printed circuit board;

[0015] 3. The utility model can drive the two brushes to move away from each other by pulling the two bottom plates away from each other. Therefore, when it is necessary to clean the dust attached to the surface of the bottom dust filter net later, the two bottom plates can be pulled to move relatively to drive the brushes to clean the dust filter net. The operation is convenient and the heat dissipation effect of the printed circuit board is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a top view of a rectangular frame of the utility model component;

[0018] Figure 3 This is a schematic diagram of the structure of the dust filter and brush fitting together in the utility model;

[0019] Figure 4 for Figure 1 The enlarged view of point A in the middle;

[0020] Figure 5 for Figure 1 The enlarged view of point B in the middle;

[0021] Figure 6 for Figure 1 Enlarged view of point C in the middle.

[0022] Numbers in the figure: 1. rectangular frame; 2. circuit board body; 3. movable shaft; 4. connecting plate; 5. bottom plate; 6. mounting plate; 7. circular plate; 8. dust filter; 9. brush; 10. positioning plate; 11. positioning hole; 12. fourth spring; 13. mounting frame; 14. second T-shaped rod; 15. third spring; 16. fan; 17. round plate; 18. sliding rod; 19. supporting plate; 20. first limit plate; 21. first T-shaped rod; 22. first spring; 23. limit block; 24. plug rod; 25. second spring; 26. toggle rod; 27. second limit plate; 28. movable block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-6 The utility model provides a technical solution: a composite printed circuit board, comprising a rectangular frame 1 and a circuit board body 2, the circuit board body 2 is located at the top of the inner cavity of the rectangular frame 1, and the middle positions of the front and rear sides of the circuit board body 2 are fixedly connected with movable shafts 3, the ends of the two movable shafts 3 that are away from each other are rotatably connected with connecting plates 4, the sides of the two connecting plates 4 that are away from each other are respectively fixedly connected with the front and rear sides of the inner cavity of the rectangular frame 1, T-shaped slide grooves are opened on the outer walls around the rectangular frame 1 near the bottom, and the inner cavity of the T-shaped slide groove is movably connected with two T-shaped sliders, and the sides of the several T-shaped sliders away from the rectangular frame 1 are fixedly connected There is a positioning plate 10, and a positioning hole 11 is opened on the positioning plate 10. Two mounting plates 6 are fixedly connected to the top of the circuit board body 2, and the two mounting plates 6 are arranged on the left and right. A mounting frame 13 is fitted on the adjacent sides of the two mounting plates 6, and a clamping mechanism is provided between the mounting frame 13 and the two mounting plates 6. A circular plate 7 is fitted on the top and bottom of the inner cavity of the mounting frame 13, and a dust filter 8 is fixedly connected to the inner cavity of the circular plate 7. A limiting mechanism is provided between the two sides of the circular plates 7 that are away from each other and the mounting frame 13. A fan 16 is provided at the middle position of the inner cavity of the mounting frame 13, and a positioning mechanism is provided on the outer side of the fan 16;

[0025] A support plate 19 is fitted on both the left and right sides of the bottom of the circuit board body 2, and a rectangular groove is opened on both the left and right sides of the inner cavity of the rectangular frame 1 near the top, and the inner cavity of the rectangular groove is movably connected with a first limiting plate 20, and the two sides of the support plates 19 that are away from each other extend to the adjacent rectangular groove inner cavity respectively, and are fixedly connected to the adjacent first limiting plates 20 respectively, and a first through-hole is opened on both the left and right sides of the rectangular frame 1 near the top, and the first through-hole inner cavity is connected to the rectangular groove inner cavity, and the two first through-hole inner cavities are penetrated by a first T-shaped rod 21, and the longer end of the T-shaped structure of the first T-shaped rod 21 is fixedly connected to the adjacent first limiting plate 20, and the outer sides of the two first T-shaped rods 21 are sleeved with a first spring 22, and the two ends of the first spring 22 are fixedly connected to the inner side wall of the rectangular groove and the first limiting plate 20 respectively, which can not only play the role of limiting the circuit board body 2, but also support the circuit board body 2, thereby improving the stability of electronic component installation;

[0026] Two bottom plates 5 are fitted at the bottom of the rectangular frame 1, and the two bottom plates 5 are fitted left and right. Brushes 9 are fixedly connected to the adjacent sides of the tops of the two bottom plates 5, and the length of the brush 9 is consistent with the width of the circular plate 7, so that the dust attached to the dust filter 8 can be cleaned by pulling the two bottom plates 5. A first slide groove is provided on the top of the two bottom plates 5, and the inner cavity of the first slide groove is movably connected with a first slider. The tops of the two first sliders are fixedly connected to the left and right sides of the bottom of the rectangular frame 1 respectively. Cavities are provided on the rectangular frame 1 near the left and right sides, and a limited slot is provided on the side of the cavity away from the center of the inner cavity of the rectangular frame 1. The inner cavities of the two cavities are fitted with limit blocks 23, and the bottom of the limit blocks 23 The two cavities are fixedly connected with an insertion rod 24, the bottoms of the two cavities are provided with a second through hole, and the second through hole cavity is connected with the first slide groove cavity, the two first sliders are provided with a third through hole, and the two first slide grooves are provided with a blind hole on the side away from the bottom of the cavity, the bottom ends of the two insertion rods 24 respectively penetrate the adjacent second through hole and the third through hole, and are respectively plugged into the adjacent blind hole cavities, the outer sides of the two insertion rods 24 are sleeved with a second spring 25, and the two ends of the second spring 25 are respectively fixedly connected to the limit block 23 and the bottom of the cavity, the two limit blocks 23 are fixedly connected to the side away from each other with a toggle rod 26, and the other end of the toggle rod 26 penetrates the limit slot cavity, so as to improve the storage safety of the composite printed circuit board;

[0027] The clamping mechanism includes two second sliders, and the two second sliders are fixedly connected to the left and right sides of the mounting frame 13 respectively. A second slide groove is provided at the top of the adjacent side of the two mounting plates 6, and the top of the second slide groove is open. The two second sliders are movably connected to the adjacent second slide groove cavities respectively. A fourth through hole is provided near the top of the side away from the two mounting plates 6, and the fourth through hole cavity is connected with the second slide groove cavity. The two fourth through hole cavities are penetrated by a second T-shaped rod 14, and the bottom of the longer end of the T-shaped structure of the second T-shaped rod 14 is fitted with the top of the adjacent second slider. The outer sides of the two second T-shaped rods 14 are sleeved with a third spring 15, and the two ends of the third spring 15 are fixedly connected to the second T-shaped rod 14 and the mounting plate 6 respectively, so as to facilitate the disassembly and assembly of the mounting frame 13.

[0028] The limiting mechanism includes two second limiting plates 27, and the two second limiting plates 27 are respectively arranged on the left and right sides of the side of the circular plate 7 away from the center of the inner cavity of the installation frame 13, and the two second limiting plates 27 are fixedly connected with a movable block 28 on the side away from each other, and the movable block 28 is provided with a third slider on the side close to the center of the inner cavity of the installation frame 13, and the third slide grooves are provided on the left and right sides of the top and bottom of the installation frame 13, and the two third sliders are respectively movably connected to the adjacent third slide groove cavities, and the fourth spring 12 is fixedly connected to the side away from the inner cavity of the two third slide grooves, and the other end of the fourth spring 12 is fixedly connected to the adjacent third slider, so as to facilitate the disassembly and assembly of the circular plate 7;

[0029] The positioning mechanism includes two circular plates 17, and the two circular plates 17 are respectively fixedly connected to the middle position of the adjacent side of the two dust filters 8. An annular groove is opened on the adjacent side of the two circular plates 17, and sliding rods 18 are inserted on the left and right sides of the inner cavity of the annular groove. The ends of several sliding rods 18 away from the adjacent circular plates 17 are respectively fixedly connected to the top and bottom of the fan 16, so as to facilitate the disassembly and assembly of the fan 16.

[0030] Working principle: When the utility model is in use, the front of the circuit board body 2 is placed toward the inner cavity of the rectangular frame 1, thereby improving the safety of the printed circuit board during storage and preventing it from being scratched and damaged. When it is needed to be used, first, by pushing the two toggle rods 26 to move upward and drive the adjacent limit blocks 23 to overcome the resistance of the second spring 25 and move upward, and drive the two insertion rods 24 to disengage from the adjacent blind hole cavities, then, pull the two bottom plates 5 away from each other, so that the bottom of the rectangular frame 1 is in an open state, then, pull the two first T-shaped rods 21 to drive the two first limit plates 20 to overcome the resistance of the first spring 22 and move to both sides, and separate the two support plates 19 from the circuit board body 2, then, turn the circuit board body 2 over, and loosen the two first T-shaped rods 21, so that the tops of the two support plates 19 are attached to the bottom of the circuit board body 2 and limit and support them, then, reset the two bottom plates 5, thereby completing the assembly of the composite printed circuit board, and the operation The utility model is convenient and prolongs the service life of the printed circuit board. A plurality of positioning plates 10 are slidably connected on the outer side walls around the rectangular frame 1, so that the installation position of the printed circuit board can be adjusted according to the use needs, and the applicability is improved. The mutual cooperation among the mounting plate 6, the second slider, the second slide groove, the second T-shaped rod 14 and the third spring 15 is convenient for clamping and fixing the mounting frame 13 at the middle position of the back side of the circuit board body 2. The mutual cooperation among the circular plate 7, the dust filter 8, the second limiting plate 27, the movable block 28, the third slider, the third slide groove, the fourth spring 12, the circular plate 17 and the sliding rod 18 is convenient for clamping and fixing the fan 16 at the middle position of the back side of the circuit board body 2. When the printed circuit board is assembled and used, the fan 16 rotates at its bottom to blow air, so that the heat dissipation efficiency of the printed circuit board can be improved. During use, the two bottom plates 5 can be pulled to move relative to each other to drive the brush 9 to clean the dust filter 8. The operation is convenient and the heat dissipation effect of the printed circuit board is improved.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite printed circuit board, comprising a rectangular frame (1) and a circuit board body (2), characterized in that: The circuit board body (2) is located at the top of the inner cavity of the rectangular frame (1), and the middle positions of the front and rear sides of the circuit board body (2) are fixedly connected with movable shafts (3), and the ends of the two movable shafts (3) that are away from each other are rotatably connected with connecting plates (4), and the sides of the two connecting plates (4) that are away from each other are respectively fixedly connected with the front and rear sides of the inner cavity of the rectangular frame (1), and the outer walls of the rectangular frame (1) are provided with T-shaped sliding grooves near the bottom, and the inner cavity of the T-shaped sliding grooves is movably connected with two T-shaped sliders, and the sides of the T-shaped sliders that are away from the rectangular frame (1) are fixedly connected with positioning plates (10), and the positioning plates (10) are provided with positioning holes (11). Two mounting plates (6) are fixedly connected to the top of the circuit board body (2), and the two mounting plates (6) are arranged on the left and right. A mounting frame (13) is provided on adjacent sides of the two mounting plates (6), and a clamping mechanism is provided between the mounting frame (13) and the two mounting plates (6). A circular plate (7) is provided on the top and bottom of the inner cavity of the mounting frame (13), and a dust filter (8) is fixedly connected to the inner cavity of the circular plate (7). A limiting mechanism is provided between the two sides of the circular plates (7) that are away from each other and the mounting frame (13). A fan (16) is provided at the middle position of the inner cavity of the mounting frame (13), and a positioning mechanism is provided on the outer side of the fan (16).

2. A composite printed circuit board according to claim 1, characterized in that: Support plates (19) are fitted on both left and right sides of the bottom of the circuit board body (2); rectangular grooves are provided on both left and right sides of the inner cavity of the rectangular frame (1) near the top, and the inner cavity of the rectangular groove is movably connected to a first limiting plate (20); the two sides of the two support plates (19) that are away from each other respectively extend to the inner cavity of the adjacent rectangular groove and are respectively fixedly connected to the adjacent first limiting plates (20); first through holes are provided on both left and right sides of the rectangular frame (1) near the top, and the inner cavity of the first through hole is connected to the inner cavity of the rectangular groove; first T-shaped rods (21) are penetrated by the two first through hole inner cavities, and the longer end of the T-shaped structure of the first T-shaped rod (21) is fixedly connected to the adjacent first limiting plate (20); first springs (22) are sleeved on the outer sides of the two first T-shaped rods (21), and the two ends of the first spring (22) are respectively fixedly connected to the inner wall of the rectangular groove and the first limiting plate (20).

3. A composite printed circuit board according to claim 1, characterized in that: The bottom of the rectangular frame (1) is fitted with two bottom plates (5), and the two bottom plates (5) are fitted on the left and right. The tops of the two bottom plates (5) are each provided with a first slide groove, and the inner cavity of the first slide groove is movably connected with a first slider, and the tops of the two first sliders are respectively fixedly connected to the left and right sides of the bottom of the rectangular frame (1). The rectangular frame (1) is provided with a cavity near the left and right sides, and a limiting groove is provided on the side of the cavity away from the center of the inner cavity of the rectangular frame (1). The inner cavities of the two cavities are each fitted with a limiting block (23), and the bottom of the limiting block (23) is fixedly connected with an insertion rod (24). The bottoms of the two cavities are each provided with a A second through hole, and the inner cavity of the second through hole is connected to the inner cavity of the first slide groove, a third through hole is opened on the two first sliders, and a blind hole is opened on the side away from the bottom of the two first slide groove inner cavities, the bottom ends of the two insertion rods (24) respectively pass through the adjacent second through hole and the third through hole, and are respectively inserted into the adjacent blind hole cavities, the outer sides of the two insertion rods (24) are sleeved with a second spring (25), and the two ends of the second spring (25) are respectively fixedly connected to the limit block (23) and the bottom of the inner cavity of the cavity, and the two limit blocks (23) are fixedly connected to the side away from the limit block (23) with a toggle rod (26), and the other end of the toggle rod (26) passes through the inner cavity of the limit slot.

4. A composite printed circuit board according to claim 3, characterized in that: A brush (9) is fixedly connected to one adjacent side of the top of the two bottom plates (5), and the length of the brush (9) is consistent with the width of the circular plate (7).

5. The composite printed circuit board according to claim 1, characterized in that: The clamping mechanism comprises two second sliders, and the two second sliders are respectively fixedly connected to the left and right sides of the mounting frame (13); a second slide groove is provided at the top of the adjacent side of the two mounting plates (6), and the top of the second slide groove is open; the two second sliders are respectively movably connected to the adjacent second slide groove cavities; a fourth through hole is provided near the top of the side away from each other of the two mounting plates (6), and the fourth through hole cavity is connected to the second slide groove cavity; a second T-shaped rod (14) is penetrated by the two fourth through hole cavities, and the bottom of the longer end of the T-shaped structure of the second T-shaped rod (14) is in contact with the top of the adjacent second slider; a third spring (15) is sleeved on the outer side of the two second T-shaped rods (14), and the two ends of the third spring (15) are respectively fixedly connected to the second T-shaped rod (14) and the mounting plate (6).

6. A composite printed circuit board according to claim 1, characterized in that: The limiting mechanism comprises two second limiting plates (27), and the two second limiting plates (27) are respectively arranged on the left and right sides of the circular plate (7) away from the center of the inner cavity of the installation frame (13), the two second limiting plates (27) are fixedly connected with a movable block (28) on the side away from each other, and the movable block (28) is provided with a third slider on the side close to the center of the inner cavity of the installation frame (13), and the third slide grooves are provided on the left and right sides of the top and bottom of the installation frame (13), and the two third sliders are respectively movably connected to the adjacent third slide groove inner cavities, and the two third slide groove inner cavities are fixedly connected with a fourth spring (12) on the side away from each other, and the other end of the fourth spring (12) is fixedly connected to the adjacent third slider.

7. A composite printed circuit board according to claim 1, characterized in that: The positioning mechanism comprises two circular plates (17), and the two circular plates (17) are respectively fixedly connected to the middle position of the adjacent sides of the two dust filters (8), and the adjacent sides of the two circular plates (17) are each provided with an annular sliding groove, and sliding rods (18) are inserted at the left and right sides of the inner cavity of the annular sliding groove, and the ends of a plurality of the sliding rods (18) away from the adjacent circular plates (17) are respectively fixedly connected to the top and the bottom of the fan (16).

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