Integrated distribution box with variable-diameter bridge

Abstract

The invention relates to the technical field of distribution boxes, in particular to an integrated distribution box with a variable-diameter bridge frame, which comprises a box body and a bridge frame fixedly inserted at the top of the box body, a mounting plate is fixedly mounted in the middle of the box body, a ventilation opening is formed in the top of the mounting plate, and a variable-diameter mechanism for adjusting the inner diameter of the bridge frame is arranged above the mounting plate. A sealing mechanism used for controlling the flow direction of air in the box body is arranged below the ventilation opening, and a cooling mechanism used for cooling electrical components in the box body is arranged on one side of the box body. Due to the fact that the output end of one U-shaped pipe faces the air exhaust hole, and the L-shaped supporting plate is arranged between the output end of the other U-shaped pipe and the electric appliance element, carbon dioxide airflow is exhausted from the air outlet hole and the air exhaust hole after passing through the interior of the box body, in the process, the carbon dioxide airflow does not make direct contact with the electric appliance element, and therefore the carbon dioxide airflow is prevented from entering the box body. Therefore, the oxygen content and the temperature in the box body are reduced while electrical components are not damaged by cold, and effective fire extinguishment is carried out in the box body.

Description

Technical Field

[0001] The invention relates to the technical field of distribution boxes, in particular to an integrated distribution box with a variable-diameter bridge. Background Art

[0002] The distribution box, also known as the distribution cabinet, is a general term for the motor control center. It is a very important component of the power system. It is a low-voltage distribution device that assembles switchgear, measuring instruments, protective electrical appliances and auxiliary equipment in a closed or semi-closed metal cabinet or on a screen according to the electrical wiring requirements. It is mainly used to receive and distribute electrical energy and realize the control, protection and monitoring of the circuit. The distribution boxes in the factory can arrange the cable lines in an orderly manner through connecting bridges, prevent line confusion and ensure the safety of the lines. However, the inner diameter of the existing bridge cannot be effectively adjusted and cannot meet the laying requirements of small-diameter cable lines. At the same time, when a fire occurs in a local area inside the distribution box, the heat generated can easily damage the surrounding electrical components. If a carbon dioxide fire extinguisher is directly sprayed into the interior of the distribution box, the electrical components inside are easily damaged by the cold. Summary of the invention

[0003] The technical problems solved by this solution are: How to solve the problem that the heat in the distribution box can easily damage the surrounding electrical components, and the electrical components inside the distribution box can be easily damaged by the cold if the carbon dioxide fire extinguisher is directly sprayed inside the distribution box; How to solve the problem that the inner diameter of the existing bridge cannot be effectively adjusted and cannot meet the needs of laying small-diameter cable lines.

[0004] The object of the present invention can be achieved through the following technical solutions: an integrated distribution box with a variable diameter bridge, comprising a box body and a bridge fixedly inserted on the top thereof, a mounting plate fixedly installed in the middle of the box body, a ventilating hole is opened on the top of the mounting plate, and a variable diameter mechanism for adjusting the inner diameter of the bridge is arranged above the mounting plate, a closing mechanism for controlling the air flow direction in the box body is arranged below the ventilating hole, and a cooling mechanism for cooling the electrical components therein is arranged on one side of the box body; The diameter-changing mechanism includes two guide plates fixedly connected to the top of the inner wall of the box body, a push rod is movably inserted in the middle of the two guide plates, a baffle is fixedly installed at one end of the push rod away from the bridge frame, and a thrust spring is elastically arranged between the baffle and one of the guide plates.

[0005] A further technical improvement of the present invention is that a flip opening is opened on the side of the bottom of the bridge toward the two guide plates, an L-shaped reducing plate is rotatably arranged in the flip opening, the end of the push rod away from the baffle is slidingly connected to the side of the L-shaped reducing plate, and a first lever is fixedly installed in the middle of the push rod; by controlling the contraction of the extended end of the electric push rod, the second lever drives the transmission rod to flip, driving the first lever and the push rod to move, so that the push rod pushes the L-shaped reducing plate to flip, controlling the inner diameter of the bottom of the bridge to become smaller, thereby meeting the laying requirements of small-diameter cable lines, preventing chaos in small-diameter cable lines, and ensuring its safety during operation.

[0006] A further technical improvement of the present invention is that an L-shaped support plate for placing electrical components is fixedly installed in the middle of the inner wall of the box body, the L-shaped support plate is arranged horizontally, and the front end surface of the L-shaped support plate is rotatably connected to a transmission rod through a pin shaft, and the top of the transmission rod is slidably connected to the first lever.

[0007] A further technical improvement of the present invention is that an insulation box is fixedly installed at the bottom of the L-shaped support plate, and a transversely arranged electric push rod is fixedly arranged inside the insulation box. The extended end of the electric push rod movably passes through the insulation box and is fixedly connected to a second lever. The second lever is slidably connected to the bottom of the transmission rod, and the extended end of the electric push rod is also rotatably connected to a first roller.

[0008] A further technical improvement of the present invention is that a first L-shaped rod is rotatably provided on the top of the mounting plate, the position of the first L-shaped rod corresponds to the position of the first roller, and a first sealing plate is fixedly installed on one end of the first L-shaped rod, the position of the first sealing plate corresponds to the position of the vent, and a first tension spring is fixedly connected between the first sealing plate and the L-shaped support plate; by opening the control valve, the cold carbon dioxide gas flow in the carbon dioxide fire extinguisher is blown out along the two output ends of the U-shaped tube, at this time, the extended end of the electric push rod is controlled to extend to the longest, and the first roller is cooperated to roll and press the middle part of the first L-shaped rod, so that the first sealing plate flips and moves, and the vent is blocked while the lifting and lowering are also controlled. The rod provides pressing power to make the second L-shaped rod flip over, controlling the second sealing plate to separate from the exhaust hole. Since the output end of one of the U-shaped tubes is arranged toward the exhaust hole, there is an L-shaped support plate between the output end of the other U-shaped tube and the electrical component. After passing through the box, the carbon dioxide gas flow is discharged from the air outlet and the exhaust hole respectively. During this process, the carbon dioxide gas flow does not come into direct contact with the electrical components, thereby reducing the oxygen content and temperature in the box while preventing the electrical components from being damaged by cold, and effectively extinguishing the fire in the box. Since the two output ends of the U-shaped tube are close to the mounting plate, the temperatures at the top and bottom of the mounting plate are both reduced, thereby avoiding damage caused by a large temperature difference between the top and bottom of the mounting plate.

[0009] A further technical improvement of the present invention is that the closing mechanism comprises a second L-shaped rod rotatably connected to the inner wall of the box body, the second L-shaped rod is located below the mounting plate, and a lifting rod is provided on one side of the second L-shaped rod, the lifting rod is longitudinally arranged.

[0010] A further technical improvement of the present invention is that the top end of the lifting rod movably passes through the vent and is rotatably provided with a second roller, the bottom end of the lifting rod is slidably connected to the bottom of the second L-shaped rod, and a guide sleeve for guiding the lifting rod is fixedly installed on the inner wall of the vent and the box body.

[0011] A further technical improvement of the present invention is that an exhaust hole is opened in the middle of the outer wall of the box body, and the exhaust hole is located below the mounting plate. A second sealing plate is fixedly installed on the top of the second L-shaped rod, and the position of the second sealing plate corresponds to the position of the exhaust hole. A second tension spring is fixedly connected between the end of the second L-shaped rod close to the second sealing plate and the inner wall of the box body.

[0012] A further technical improvement of the present invention is that the cooling mechanism includes an outer shell fixedly connected to the side of the box body, a partition is fixedly installed in the middle of the outer shell, a carbon dioxide fire extinguisher is arranged on the top of the partition, the carbon dioxide fire extinguisher is the existing technology, and a control valve is fixedly installed at the output end of the carbon dioxide fire extinguisher.

[0013] A further technical improvement of the present invention is that the output end of the carbon dioxide fire extinguisher is also connected to a U-shaped tube, the two output ends of the U-shaped tube both pass through the outer shell and are connected to the side of the box body, the two output ends of the U-shaped tube are respectively located above and below the mounting plate, and the two output ends of the U-shaped tube are close to the mounting plate, and one of the output ends of the U-shaped tube is arranged toward the exhaust hole.

[0014] Compared with the prior art, the present invention has the following beneficial effects: When the present invention is in use, by opening the control valve, the cold carbon dioxide gas flow in the carbon dioxide fire extinguisher is blown out along the two output ends of the U-shaped tube. At this time, the extended end of the electric push rod is controlled to be extended to the longest, and the first roller is cooperated to roll and press the middle part of the first L-shaped rod, so that the first sealing plate is flipped and moved. While blocking the vent, the lifting rod is also provided with pressing power, so that the second L-shaped rod is flipped, and the second sealing plate is controlled to be separated from the exhaust hole. Since the output end of one of the U-shaped tubes is arranged toward the exhaust hole, there is an L-shaped support plate between the output end of the other U-shaped tube and the electrical component, the carbon dioxide After passing through the box, the carbon dioxide gas flow is discharged from the air outlet and exhaust holes respectively. During this process, the carbon dioxide gas flow does not come into direct contact with the electrical components, thereby reducing the oxygen content and temperature in the box while preventing the electrical components from being damaged by the cold, thereby effectively extinguishing the fire in the box. Since the two output ends of the U-shaped tube are close to the mounting plate, the ejected carbon dioxide gas flow reduces the temperatures at the top and bottom of the mounting plate, thereby preventing the mounting plate from being damaged due to the large temperature difference between the top and bottom of the mounting plate. At the same time, the ejected carbon dioxide gas flow also cools the non-fired area, thereby preventing the electrical components therein from being damaged by heat.

[0015] When the present invention is in use, the extended end of the electric push rod is controlled to retract, and the second lever is cooperated to drive the transmission rod to flip, thereby driving the first lever and the push rod to move, so that the push rod pushes the L-shaped reducer plate to flip, and controls the inner diameter of the bottom of the bridge to become smaller, thereby meeting the laying requirements of small-diameter cable lines, preventing chaos in the small-diameter cable lines, and ensuring its safety during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0017] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 It is a schematic diagram of the structure of the diameter-changing mechanism of the present invention; Figure 4 It is a three-dimensional schematic diagram of the local structure of the diameter-changing mechanism of the present invention; Figure 5 It is a schematic diagram of the structure of the closing mechanism of the present invention; Figure 6 It is a schematic diagram of the cooling mechanism structure of the present invention.

[0018] In the figure: 1, cooling mechanism; 2, box body; 3, box door; 4, bridge; 5, reducing mechanism; 6, mounting plate; 7, closing mechanism; 8, smoke detector; 9, air outlet; 10, vent; 101, shell; 102, control valve; 103, carbon dioxide fire extinguisher; 104, L-shaped pipe; 105, air pump; 106, partition; 107, U-shaped pipe; 501, guide plate; 502, push rod; 503, transmission rod; 504, L-shaped support plate; 505, electric push rod; 506, first L-shaped rod; 507, first sealing plate; 508, first lever; 509, L-shaped reducing plate; 510, incubator; 511, second lever; 512, first roller; 701, lifting rod; 702, guide sleeve; 703, second L-shaped rod; 704, second sealing plate; 705, air outlet. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 6 As shown, an integrated distribution box with a variable diameter bridge comprises a box body 2 and a bridge frame 4 fixedly inserted on the top thereof, a mounting plate 6 is fixedly installed in the middle of the box body 2, a vent 10 is provided on the top of the mounting plate 6, and a variable diameter mechanism 5 for adjusting the inner diameter of the bridge frame 4 is provided above the mounting plate 6, a closing mechanism 7 for controlling the air flow direction in the box body 2 is provided below the vent 10, and a cooling mechanism 1 for cooling the electrical components therein is provided on one side of the box body 2.

[0021] See also Figure 1-Figure 6 As shown, the above-mentioned diameter-changing mechanism 5 includes two guide plates 501 fixedly connected to the top of the inner wall of the box body 2, a push rod 502 is movably inserted in the middle of the two guide plates 501, a baffle is fixedly installed at one end of the push rod 502 away from the bridge frame 4, and a thrust spring is elastically arranged between the baffle and one of the guide plates 501.

[0022] See also Figure 2 and Figure 3As shown, a flipping opening is provided at the bottom of the bridge 4 on the side facing the two guide plates 501, and an L-shaped reducing plate 509 is rotatably arranged in the flipping opening. The end of the push rod 502 away from the baffle is slidably connected to the side of the L-shaped reducing plate 509, and a first lever 508 is fixedly installed in the middle of the push rod 502; by controlling the contraction of the extended end of the electric push rod 505, the second lever 511 is cooperated to drive the transmission rod 503 to flip, and the first lever 508 and the push rod 502 are driven to move, so that the push rod 502 pushes the L-shaped reducing plate 509 to flip, and controls the inner diameter of the bottom of the bridge 4 to become smaller, thereby meeting the laying requirements of small-diameter cable lines, preventing chaos in small-diameter cable lines, and ensuring its safety during operation.

[0023] See also Figure 2 and Figure 3 As shown, an L-shaped support plate 504 for placing electrical components is fixedly installed in the middle of the inner wall of the above-mentioned box body 2, the L-shaped support plate 504 is arranged horizontally, and the front end surface of the L-shaped support plate 504 is rotatably connected to the transmission rod 503 through a pin shaft, and the top of the transmission rod 503 is slidably connected to the first lever 508.

[0024] See also Figure 3 and Figure 4 As shown, an insulation box 510 is fixedly installed at the bottom of the above-mentioned L-shaped support plate 504, and a transversely arranged electric push rod 505 is fixedly arranged inside the insulation box 510. The extended end of the electric push rod 505 movably passes through the insulation box 510 and is fixedly connected to a second lever 511. The second lever 511 is slidably connected to the bottom of the transmission rod 503, and the extended end of the electric push rod 505 is also rotatably connected to a first roller 512.

[0025] See also Figure 3 and Figure 5As shown, a first L-shaped rod 506 is rotatably provided on the top of the above-mentioned mounting plate 6, and the position of the first L-shaped rod 506 corresponds to the position of the first roller 512, and a first sealing plate 507 is fixedly installed on one end of the first L-shaped rod 506, and the position of the first sealing plate 507 corresponds to the position of the vent 10, and a first tension spring is fixedly connected between the first sealing plate 507 and the L-shaped supporting plate 504; by opening the control valve 102, the cold carbon dioxide gas flow in the carbon dioxide fire extinguisher 103 is blown out along the two output ends of the U-shaped tube 107, at this time, the extended end of the control electric push rod 505 is extended to the longest, and the first roller 512 is cooperated to roll and press the middle part of the first L-shaped rod 506, so that the first sealing plate 507 is flipped and moved, and the vent 10 is blocked while the lifting and lowering is also stopped. The rod 701 provides a pressing force to flip the second L-shaped rod 703, controlling the second sealing plate 704 to separate from the exhaust hole 705. Since the output end of one of the U-shaped tubes 107 is set toward the exhaust hole 705, there is an L-shaped support plate 504 between the output end of the other U-shaped tube 107 and the electrical component. After passing through the box 2, the carbon dioxide gas flow is discharged from the air outlet 9 and the exhaust hole 705 respectively. During this process, the carbon dioxide gas flow does not come into direct contact with the electrical components, thereby reducing the oxygen content and temperature in the box 2 while preventing the electrical components from being damaged by the cold, thereby effectively extinguishing the fire in the box 2. Since the two output ends of the U-shaped tube 107 are close to the mounting plate 6, the temperatures at the top and bottom of the mounting plate 6 are both reduced, thereby avoiding damage caused by the large temperature difference between the top and bottom of the mounting plate 6.

[0026] See also Figure 2 and Figure 5 As shown, the above-mentioned closing mechanism 7 includes a second L-shaped rod 703 rotatably connected to the inner wall of the box body 2, the second L-shaped rod 703 is located below the mounting plate 6, and a lifting rod 701 is provided on one side of the second L-shaped rod 703, and the lifting rod 701 is longitudinally arranged.

[0027] See also Figure 2 and Figure 5 As shown, the top end of the lifting rod 701 movably passes through the vent 10 and is rotatably provided with a second roller, the bottom end of the lifting rod 701 is slidably connected to the bottom of the second L-shaped rod 703, and a guide sleeve 702 for guiding the lifting rod 701 is fixedly installed on the inner wall of the vent 10 and the box body 2.

[0028] See also Figure 2 and Figure 5As shown, an exhaust hole 705 is opened in the middle of the outer wall of the above-mentioned box body 2, and the exhaust hole 705 is located below the mounting plate 6. A second sealing plate 704 is fixedly installed on the top of the second L-shaped rod 703. The position of the second sealing plate 704 corresponds to the position of the exhaust hole 705. A second tension spring is fixedly connected between the end of the second L-shaped rod 703 close to the second sealing plate 704 and the inner wall of the box body 2.

[0029] See also Figure 2 and Figure 6 As shown, the above-mentioned cooling mechanism 1 includes a shell 101 fixedly connected to the side of the box body 2, a partition 106 is fixedly installed in the middle of the shell 101, a carbon dioxide fire extinguisher 103 is arranged on the top of the partition 106, the carbon dioxide fire extinguisher 103 is the existing technology, and a control valve 102 is fixedly installed at the output end of the carbon dioxide fire extinguisher 103.

[0030] See also Figure 2 and Figure 6 As shown, the output end of the above-mentioned carbon dioxide fire extinguisher 103 is also connected to a U-shaped tube 107, and the two output ends of the U-shaped tube 107 both pass through the outer shell 101 and are connected to the side of the box body 2. The two output ends of the U-shaped tube 107 are respectively located above and below the mounting plate 6, and the two output ends of the U-shaped tube 107 are close to the mounting plate 6, and one of the output ends of the U-shaped tube 107 is arranged toward the exhaust hole 705.

[0031] See also Figure 2 and Figure 6 As shown, an air pump 105 is arranged at the bottom of the partition 106, and the output end of the air pump 105 is connected to an L-shaped tube 104. The output end of the L-shaped tube 104 passes through the outer shell 101 and is connected to the bottom of the side of the box body 2. An air inlet is opened on the front of the outer shell 101, and the position of the air inlet corresponds to the position of the air pump 105.

[0032] See also Figure 1 and Figure 2 As shown, smoke detectors 8 are fixedly mounted on the inner walls of the box body 2 above and below the mounting plate 6, and the smoke detectors 8 are prior art.

[0033] See also Figure 1 and Figure 2 As shown, an air outlet 9 is provided on the outer wall of the box body 2 at one side of the bottom of the bridge frame 4, a box door 3 is hinged on the front of the box body 2, and electrical components are also provided at the bottom of the inner wall of the box body 2.

[0034] Working principle: When the present invention is used, first, Figure 1 , Figure 2 and Figure 6 As shown, the box door 3 is closed, and the air pump 105 is turned on to allow the air flow to flow into the interior of the box body 2 through the L-shaped tube 104. Figure 2 and Figure 5 As shown, due to the action of the second tension spring, the second sealing plate 704 blocks the exhaust hole 705, so that the airflow passes through the vent 10. In this process, the airflow passing through the interior of the box 2 carries the high temperature and humid air inside the box 2 and is discharged through the air outlet 9, thereby ensuring the normal operation of the electrical components in the box 2 and reducing the probability of fire in the box 2. Figure 3 and Figure 4 As shown, by controlling the extended end of the electric push rod 505 to retract, the second lever 511 drives the transmission rod 503 to flip, and drives the first lever 508 and the push rod 502 to move, so that the push rod 502 pushes the L-shaped reducing plate 509 to flip, and controls the inner diameter of the bottom of the bridge 4 to become smaller, thereby meeting the laying requirements of small-diameter cable lines, preventing small-diameter cable lines from being chaotic, and ensuring its safety during operation; Figure 2 , Figure 3 and Figure 6 As shown, when a fire occurs above or below the mounting plate 6 in the box body 2, the smoke detector 8 collects the generated smoke information and opens the control valve 102, so that the cold carbon dioxide gas flow in the carbon dioxide fire extinguisher 103 is blown out along the two output ends of the U-shaped tube 107. At this time, the extended end of the electric push rod 505 is controlled to extend to the longest, and the first roller 512 is cooperated to roll and press the middle part of the first L-shaped rod 506, so that the first sealing plate 507 is flipped and moved, and while the vent 10 is blocked, the lifting rod 701 is also provided with pressing power, so that the second The L-shaped rod 703 flips over to control the second sealing plate 704 to separate from the exhaust hole 705. Since the output end of one of the U-shaped tubes 107 is arranged toward the exhaust hole 705, and there is an L-shaped support plate 504 between the output end of the other U-shaped tube 107 and the electrical component, the carbon dioxide gas flow is discharged from the air outlet 9 and the exhaust hole 705 respectively after passing through the box 2. In this process, the carbon dioxide gas flow does not come into direct contact with the electrical component, thereby reducing the oxygen content and temperature in the box 2 while preventing the electrical component from being damaged by cold, and effectively extinguishing the fire in the box 2; Figure 2 , Figure 3 and Figure 5 As shown, since the two output ends of the U-shaped tube 107 are close to the mounting plate 6, the ejected carbon dioxide gas flow reduces the temperature of the top and bottom of the mounting plate 6, thereby preventing the mounting plate 6 from being damaged due to a large temperature difference between the top and bottom. At the same time, the ejected carbon dioxide gas flow also cools down the non-fired area, thereby preventing the electrical components therein from being damaged due to heat.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An integrated distribution box with a variable-diameter bridge, comprising a box body (2) and a bridge (4) fixedly inserted on the top of the box body, characterized in that: A mounting plate (6) is fixedly mounted in the middle of the box (2), a vent (10) is provided on the top of the mounting plate (6), and a diameter-changing mechanism (5) for adjusting the inner diameter of the bridge (4) is provided above the mounting plate (6), a sealing mechanism (7) for controlling the air flow direction in the box (2) is provided below the vent (10), and a cooling mechanism (1) for cooling the electrical components therein is provided on one side of the box (2); The diameter-changing mechanism (5) comprises two guide plates (501) fixedly connected to the top of the inner wall of the box body (2), a push rod (502) being movably inserted in the middle of the two guide plates (501), a baffle being fixedly mounted on one end of the push rod (502) away from the bridge frame (4), and a thrust spring being elastically arranged between the baffle and one of the guide plates (501).

2. The integrated distribution box with a variable-diameter bridge according to claim 1, characterized in that: The bottom of the bridge frame (4) is provided with a flip opening on the side facing the guide plate (501), an L-shaped reducing plate (509) is rotatably arranged in the flip opening, one end of the push rod (502) away from the baffle is slidably connected to the side of the L-shaped reducing plate (509), and a first shifting rod (508) is fixedly installed in the middle of the push rod (502).

3. The integrated distribution box with a variable-diameter bridge according to claim 1, characterized in that: An L-shaped support plate (504) for placing electrical components is fixedly installed in the middle of the inner wall of the box body (2), the front end surface of the L-shaped support plate (504) is rotatably connected to a transmission rod (503), and the top of the transmission rod (503) is slidably connected to a first shifting rod (508).

4. The integrated distribution box with a variable-diameter bridge according to claim 3, characterized in that: An insulated box (510) is fixedly mounted on the bottom of the L-shaped support plate (504), an electric push rod (505) is fixedly arranged inside the insulated box (510), an extended end of the electric push rod (505) movably passes through the insulated box (510) and is fixedly connected to a second lever (511), the second lever (511) is slidably connected to the bottom of the transmission rod (503), and the extended end of the electric push rod (505) is also rotatably connected to a first roller (512).

5. The integrated distribution box with a variable-diameter bridge according to claim 1, characterized in that: A first L-shaped rod (506) is rotatably provided at the top of the mounting plate (6), the position of the first L-shaped rod (506) corresponding to the position of the first roller (512), and a first sealing plate (507) is fixedly installed at one end of the first L-shaped rod (506), the position of the first sealing plate (507) corresponding to the position of the vent (10), and a first tension spring is fixedly connected between the first sealing plate (507) and the L-shaped support plate (504).

6. The integrated distribution box with a variable-diameter bridge according to claim 1, characterized in that: The closing mechanism (7) comprises a second L-shaped rod (703) rotatably connected to the inner wall of the box body (2), the second L-shaped rod (703) is located below the mounting plate (6), and a lifting rod (701) is provided on one side of the second L-shaped rod (703).

7. The integrated distribution box with a variable-diameter bridge according to claim 6, characterized in that: The top end of the lifting rod (701) movably penetrates the vent (10) and is rotatably provided with a second roller, the bottom end of the lifting rod (701) is slidably connected to the bottom of the second L-shaped rod (703), and a guide sleeve (702) for guiding the lifting rod (701) is fixedly installed on the inner wall of the vent (10) and the box body (2).

8. The integrated distribution box with a variable-diameter bridge according to claim 6, characterized in that: An exhaust hole (705) is provided in the middle of the outer wall of the box body (2), and the exhaust hole (705) is located below the mounting plate (6). A second sealing plate (704) is fixedly mounted on the top end of the second L-shaped rod (703), and the position of the second sealing plate (704) corresponds to the position of the exhaust hole (705). A second tension spring is fixedly connected between the end of the second L-shaped rod (703) close to the second sealing plate (704) and the inner wall of the box body (2).

9. The integrated distribution box with a variable-diameter bridge according to claim 1, characterized in that: The cooling mechanism (1) comprises a shell (101) fixedly connected to the side of the box body (2), a partition (106) fixedly installed in the middle of the shell (101), a carbon dioxide fire extinguisher (103) is arranged on the top of the partition (106), and a control valve (102) is fixedly installed at the output end of the carbon dioxide fire extinguisher (103).

10. The integrated distribution box with a variable-diameter bridge according to claim 9, characterized in that: The output end of the carbon dioxide fire extinguisher (103) is also connected to a U-shaped tube (107), and both output ends of the U-shaped tube (107) are connected to the side of the box body (2). The two output ends of the U-shaped tube (107) are respectively located above and below the mounting plate (6), and the two output ends of the U-shaped tube (107) are close to the mounting plate (6), and one of the output ends of the U-shaped tube (107) is arranged toward the exhaust hole (705).

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