A mine-use explosion-proof and intrinsically safe high-voltage combined vacuum distribution cabinet and its use method

Abstract

The present invention relates to a mine-use explosion-proof and intrinsically safe high-voltage combined vacuum distribution cabinet and a method for using the same. The cabinet door is sealed and slidably connected with a sealing inner plate located on the inner side of the door frame and spanning the door gap. The door frame is provided with an airbag that cooperates with the sealing inner plate for sealing. The airbag is connected to an air pump located outside the cabinet. The door frame is also provided with a plurality of first perforations that are connected to the door gap. The airbag extends through the first perforations into the door gap. After the airbag expands, it blocks the gap between two adjacent first perforations. The invention provides a first air cavity. When the cabinet cavity is evacuated, the air below the first piston pushes the first piston to slide, thereby overcoming the pulling force of the reset device on the sealing inner plate, causing the sealing inner plate to extend and cover the door gap, thereby cooperating with the airbag to seal. The sealing formed by the sealing inner plate and the protrusion is achieved by relying on the vacuum in the cabinet cavity. Therefore, even if the airbag ruptures, the provision of the sealing inner plate and the protrusion can ensure the vacuum seal in the cabinet.

Description

Technical Field

[0001] The invention relates to the field of power distribution cabinets, in particular to the technical field of high-voltage combined vacuum power distribution cabinets, specifically to a mine-use explosion-proof and intrinsically safe high-voltage combined vacuum power distribution cabinet and a method of using the same. Background Art

[0002] Based on the degree of danger in the operating environment, mining high-voltage distribution equipment can be divided into general-purpose mining high-voltage vacuum distribution cabinets and flameproof high-voltage vacuum distribution cabinets. General-purpose distribution cabinets are used in locations without explosion hazards under normal conditions. Flameproof distribution cabinets are flameproof distribution equipment designed for use in potentially explosive environments, such as coal mines and areas with flammable and explosive dust. Electrical contact sparks and heat within the flameproof distribution cabinet will not ignite explosive gases and dust outside the cabinet. Distribution cabinets used in locations with explosion hazards must be flameproof.

[0003] The current flameproof high-voltage vacuum distribution cabinet is only sealed in the door gap and cannot form a seal between the cabinet door and the door frame in the cabinet cavity, resulting in poor sealing effect. Summary of the Invention

[0004] In response to the deficiencies in the prior art, the invention provides a mine-use explosion-proof and intrinsically safe high-voltage combined vacuum distribution cabinet and a method of using the same. A seal is formed between the cabinet door and the door frame within the cabinet cavity, and multiple sealing surfaces are formed simultaneously, ensuring a sealing effect even in the event of an airbag rupture.

[0005] The invention is realized through the following technical solution: a mine-use explosion-proof and intrinsically safe high-voltage combined vacuum distribution cabinet, comprising a door frame and a cabinet door; the cabinet door is sealed and slidably connected with a sealing inner plate located on the inner side of the door frame and spanning the door gap; the door frame is provided with an airbag that cooperates with the sealing inner plate for sealing; the airbag is connected to an air pump located outside the cabinet; the door frame is also provided with a plurality of first perforations that are connected to the door gap; the airbag extends through the first perforations into the door gap; and after the airbag expands, it blocks the gap between two adjacent first perforations.

[0006] When the present invention is in use, the airbag and the sealing inner plate are arranged to form a seal between the cabinet door and the door frame in the inner cavity of the cabinet, thereby enhancing the sealing effect.

[0007] Preferably, the cabinet door is provided with several first air cavities corresponding to the sealed inner plate, and the first piston is slidably connected in the first air cavity in the same sliding direction as the sealed inner plate. The first piston is connected to the sealed inner plate through a first connecting plate, and the first connecting plate seals and passes through the first air cavity. The cabinet door is also provided with a first long hole connected to the first air cavity and located between the first piston and the sealed inner plate. The first long hole is connected to the inner cavity of the cabinet body, and the cabinet door is also provided with a reset device for driving the sealed inner plate to slide into the cabinet door.

[0008] When this preferred solution is in use, through the setting of the first air cavity, when the inner cavity of the cabinet is vacuumed, the air below the first piston pushes the first piston to slide, thereby overcoming the pulling force of the reset device on the sealing inner plate, causing the sealing inner plate to extend and cover the door gap, thereby cooperating with the airbag to seal.

[0009] Preferably, the door frame is further provided with an inwardly protruding block, and the sealing inner plate is pressed against the block to form a sealing surface.

[0010] When this preferred solution is in use, the seal formed by the sealing inner plate and the protrusion is achieved by relying on the vacuum in the cabinet cavity. Therefore, even if the airbag ruptures, the arrangement of the sealing inner plate and the protrusion can ensure the vacuum seal in the cabinet.

[0011] Preferably, the reset device includes a plurality of first sliding cavities corresponding to the sealing inner plate, a spring located in the first sliding cavity, and a slider located between the sealing inner plate and the spring and slidingly connected in the first sliding cavity, the slider being connected to the corresponding sealing inner plate through the slider, the slider being connected to the first sliding cavity through the spring, and the extension direction of the spring being the same as the movement direction of the sealing inner plate.

[0012] This preferred solution facilitates the sealing inner plate to be located inside the cabinet door by setting a reset device, thereby achieving the closing of the cabinet door. When the cabinet inner cavity is evacuated, the first piston overcomes the tension of the spring and drives the sealing inner plate across the door gap.

[0013] Preferably, a through hole is provided on the sealed inner plate and is located between the door gap and the protrusion, and the airbag extends into the through hole. A channel connecting the door gap and the inner cavity of the cabinet is also provided on the cabinet door, and the airbag expands into the channel after expansion.

[0014] This preferred solution is to set up a through hole, so that after the airbag expands, it enters the channel and the through hole. At the same time, the vacuum in the cabinet cavity has a force pulling the airbag to move into the cabinet cavity. Therefore, when the airbag ruptures, the airbag is adsorbed on the inner wall of the channel and the through hole under the influence of the vacuum, thereby forming a seal.

[0015] Preferably, the cabinet door is also fixed with a sealing outer panel located on the outside of the cabinet body, and a plurality of second perforations are opened on the outer surface of the door frame. After the airbag is inflated, it is pushed onto the sealing outer panel, and the gap between two adjacent second perforations is blocked after the airbag is inflated.

[0016] This preferred solution forms a seal for the door gap on the outside of the cabinet through the cooperation of the sealing outer plate and the airbag, thereby improving the sealing effect.

[0017] Preferably, four sealing inner panels are arranged corresponding to the four door gaps, and the length of the sealing inner panels is adapted to the length of the corresponding door gaps. The sides of the upper sealing inner panel and the lower sealing inner panel are provided with sliding grooves for inserting the two side sealing inner panels, and the airbag is annular.

[0018] The arrangement of this preferred solution avoids interference between the four sealing plates.

[0019] Preferably, a sealing patch extending upward / downward is sealingly and slidingly connected on the top / bottom surface of the sealing inner plate located on the side, and the sealing patch is connected to the second piston through a support plate. A second sliding cavity for sealing and sliding of the second piston is opened in the sealing inner plate, and a tension spring is provided in the second sliding cavity to drive the second piston to slide into the sealing inner plate. A second long hole is also provided in the second sliding cavity between the door gap and the second piston. The protrusion is annular, and the sealing patch is connected to the protrusion to form a sealing surface.

[0020] When this preferred solution is in use, after the sealing inner plate moves into position, the sealing patch leaves the slide groove. Under the action of vacuum, the second piston overcomes the tension of the tension spring and drives the sealing patch to extend, so that the sealing patch cooperates with the protrusion to form a seal, thereby achieving sealing at the corner.

[0021] Preferably, four sealing outer panels are provided corresponding to the four door gaps, and the four sealing outer panels are connected in sequence end to end.

[0022] This preferred solution further ensures the sealing effect by providing a sealing outer plate.

[0023] A method for using a mine-used explosion-proof and intrinsically safe high-voltage combined vacuum distribution cabinet comprises the following steps:

[0024] Close the cabinet door hinged on the cabinet body, and then use an air pump to deliver air into the airbag. The airbag expands due to the air, passes through the first perforation and enters the door gap, connecting the airbag with the cabinet door to form a first seal. Then, it passes through the second perforation and connects the airbag with the sealing outer panel to form a second seal. At the same time, the airbag expands into the cabinet cavity.

[0025] Under the action of the first and second seals, the distribution cabinet body is initially sealed, and then the inner cavity of the cabinet is vacuumed. In the first air cavity, due to the setting of the first long hole, the air between the piston and the sealing inner plate is evacuated. The air in the first long hole pushes the piston to move toward the door gap, so that the sealing inner plate crosses the door gap and presses onto the protrusion, forming a third seal between the sealing inner plate and the protrusion. During the movement of the sealing inner plate, the airbag is squeezed, so that the airbag presses onto the sealing inner plate, thereby achieving a fourth seal between the airbag and the sealing inner plate. At the same time, the airbag also expands to enter the through hole and the channel, blocking the through hole and the channel.

[0026] When the sealing inner plates on both sides move outward, the second piston pushes out the sealing patch under the action of the second long hole, so that the sealing patch covers the corner of the door gap. The sealing patch cooperates with the airbag to seal, and at the same time, the sealing patch cooperates with the protrusion to form a sealing surface;

[0027] After the vacuum is completed, even if the airbag ruptures, the airbag will be vacuum-absorbed into the through-holes and channels to continue to achieve sealing. At the same time, the third seal also relies on the vacuum setting inside the cabinet, so the sealing inside the cabinet will still be achieved;

[0028] When the cabinet needs to be opened, air is supplied into the cabinet. Under the action of the tension spring, the sealing patch plate is driven to enter the sealed inner plate. At the same time, driven by the spring reset device, the sealed inner plate moves toward the inner cabinet door, thereby removing the obstruction of the sealing inner plate to the cabinet door opening. At the same time, the airbag is deflated and contracted, making it easier to open the cabinet door.

[0029] The beneficial effects of the invention are as follows: by arranging the airbag and the sealing inner plate, a seal between the cabinet door and the door frame is formed in the inner cavity of the cabinet, thereby enhancing the sealing effect; by arranging the first air cavity, when the inner cavity of the cabinet is evacuated, the air below the first piston pushes the first piston to slide, thereby overcoming the pulling force of the reset device on the sealing inner plate, so that the sealing inner plate extends out and covers the door gap, thereby cooperating with the airbag to seal; the seal formed by the sealing inner plate and the protrusion is achieved by relying on the vacuum in the inner cavity of the cabinet, so even if the airbag is broken, the arrangement of the sealing inner plate and the protrusion can ensure the vacuum seal in the cabinet; by arranging the reset device, it is convenient for the sealing inner plate to be located in the cabinet door, thereby realizing the closing of the cabinet door. When the inner cavity of the cabinet is evacuated, the first piston overcomes the pulling force of the spring and drives the sealing inner plate across the door gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the main view of the invention structure;

[0031] Figure 2 A side view schematic diagram of the invention structure door frame and cabinet door when connected;

[0032] Figure 3 for Figure 2 A in the middle is an enlarged schematic diagram;

[0033] Figure 4 It is a rear view schematic diagram of the outer cabinet door and the protrusion;

[0034] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0035] Figure 6 for Figure 5 Enlarged schematic diagram at point C in the middle;

[0036] As shown in the figure:

[0037] 1. Door frame, 2. Cabinet door, 3. Bump, 4. Outer sealing plate, 5. Airbag, 6. Through hole, 7. Inner sealing plate, 8. Channel, 9. First long hole, 10. First piston, 11. First air cavity, 12. Sealing patch, 13. Second long hole, 14. Second piston, 15. Tension spring, 16. Spring, 17. Slider. DETAILED DESCRIPTION

[0038] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0039] Refer to the attached Figure 1-6 , a mine-use explosion-proof and intrinsically safe high-voltage combined vacuum distribution cabinet and a method of using the same are invented, comprising a distribution cabinet door frame 1 and a cabinet door 2 connected to the door frame 1, and four sealing outer panels 4 arranged circumferentially and connected end to end in sequence are provided on the outer side of the cabinet door 2, the sealing outer panels 4 being arranged corresponding to the four door gaps, and the four sealing outer panels 4 covering the four door gaps.

[0040] The cabinet door 2 is sealed and slidably connected with a sealed inner plate 7 located on the inner side of the door frame 1 and spanning the door gap. The cabinet door 2 is provided with a plurality of first air cavities 11 corresponding to the sealed inner plates 7. The first air cavity 11 is slidably connected with a first piston 10 in the same sliding direction as the sealed inner plate 7. The first piston 10 is connected to the sealed inner plate 7 through a first connecting plate. The first connecting plate seals and passes through the first air cavity 11. The cabinet door 2 is also provided with a first long hole 9 connected to the first air cavity 11 and located between the first piston 10 and the sealed inner plate 7. The first long hole 9 is connected to the inner cavity of the cabinet body. The cabinet door 2 is also provided with a reset device for driving the sealed inner plate 7 to slide into the cabinet door 2.

[0041] The reset device includes a plurality of first sliding cavities corresponding to the sealed inner plate 7, a spring 16 located in the first sliding cavity, and a slider 17 located between the sealed inner plate 7 and the spring 16 and slidingly connected in the first sliding cavity. The slider 17 is connected to the corresponding sealed inner plate 7 through the slide, and the slider 17 is connected to the first sliding cavity through the spring 16. The extension direction of the spring 16 is the same as the movement direction of the sealed inner plate 7.

[0042] There are four sealing inner panels 7, which are arranged corresponding to the four door gaps, and the length of the sealing inner panels 7 is adapted to the length of the corresponding door gaps. The sides of the upper sealing inner panel and the lower sealing inner panel are provided with sliding grooves for inserting the two side sealing inner panels.

[0043] A sealing patch 12 extending upward / downward is sealingly and slidingly connected to the top / bottom surface of the sealing inner plate 7 located on the side. The sealing patch 12 is connected to the second piston 14 through a support plate. A second sliding cavity for sealing and sliding of the second piston 14 is opened in the sealing inner plate 7. A tension spring 15 is provided in the second sliding cavity to drive the second piston 14 to slide into the sealing inner plate 7. A second long hole 13 is also provided in the second sliding cavity between the door gap and the second piston 14.

[0044] The door frame 1 is also provided with an inwardly protruding bump 3, and the sealing inner plate 7 is pressed against the bump 3 to form a sealing surface. The bump 3 is annular, and the sealing patch plate 12 is connected to the bump 3 to form a sealing surface.

[0045] The door frame 1 is provided with four annular air bags 5 adapted to the door gaps. The air bags 5 are connected to the air pump outside the cabinet. The door frame 1 is also provided with a plurality of first perforations connected to the door gaps. The air bags 5 extend through the first perforations into the door gaps. After the air bags 5 are inflated, they block the gap between two adjacent first perforations. The outer surface of the door frame 1 is provided with a plurality of second perforations. After the air bags 5 are inflated, they push against the sealing outer plate 4 and block the gap between two adjacent second perforations. The inner side of the cabinet is also provided with a plurality of air bags connected to the inner cavity of the cabinet. There are several third perforations. After the airbag 5 is inflated, it extends through the third perforations into the cabinet inner cavity. When the sealing inner plate 7 and the sealing patch plate 12 are extended, the airbag 5 cooperates with the sealing inner plate 7 and the sealing patch plate 12 to achieve sealing of the cabinet door 2 and the door frame 1 in the cabinet inner cavity. At the same time, after the airbag 5 is squeezed, a part of the airbag 5 is squeezed and extends toward the door gap, thereby sealing the door gap along the sealing inner plate 7, thereby achieving further sealing of the sliding interface between the sealing inner plate 7 and the cabinet door 2, thereby further enhancing the sealing strength of the sealing inner plate 7 and the cabinet door 2 at the sliding outlet.

[0046] The sealing inner plate 7 and the sealing patch plate 12 are both provided with a through hole 6 that penetrates the sealing inner plate 7 and is located between the door gap and the protrusion 3. The airbag 5 extends into the through hole 6. The cabinet door 2 is also provided with a channel 8 that connects the door gap and the cabinet inner cavity. After the airbag 5 is inflated, it expands into the channel 8. The connection surface of the sealing patch plate 12 to the protrusion 3 is an inclined guide slope.

[0047] A pressure sensor and an alarm are provided in the airbag 5 .

[0048] A method for using a mine-used explosion-proof and intrinsically safe high-voltage combined vacuum distribution cabinet comprises the following steps:

[0049] Close the cabinet door 2 hinged on the cabinet body, and then use an air pump to deliver air into the airbag 5. The airbag 5 is inflated by the air, passes through the first perforation and enters the door gap, so that the airbag 5 is connected to the cabinet door 2 to form a first seal. Then, it passes through the second perforation, so that the airbag 5 is connected to the sealing outer plate 4 to form a second seal. At the same time, the airbag 5 expands into the cabinet cavity.

[0050] Under the action of the first and second seals, the distribution cabinet is initially sealed. Then, the inner cavity of the cabinet is vacuumed. In the first air cavity 11, due to the provision of the first long hole 9, the air between the piston and the sealing inner plate 7 is evacuated. The air in the first long hole 9 pushes the piston toward the door gap, so that the sealing inner plate 7 crosses the door gap and presses onto the protrusion. The sealing inner plate 7 forms a third seal with the protrusion. During the movement of the sealing inner plate 7, the airbag 5 is squeezed, so that the airbag 5 presses onto the sealing inner plate 7, thereby achieving a fourth seal between the airbag 5 and the sealing inner plate 7. At the same time, the airbag 5 also expands to enter the through hole 6 and the channel 8, blocking the through hole 6 and the channel 8.

[0051] When the sealing inner plates 7 on both sides move outward, the second piston 14 pushes out the sealing patch 12 under the action of the second long hole 13, so that the sealing patch 12 covers the corner of the door gap. The sealing patch 12 cooperates with the airbag 5 to seal, and at the same time, the sealing patch 12 cooperates with the protrusion 3 to form a sealing surface;

[0052] After the vacuum is completed, even if the airbag 5 ruptures, the airbag 5 is vacuum-absorbed into the through hole 6 and the channel 8, and the sealing is continued. At the same time, the cooperation between the sealing inner plate 7 and the protrusion 3, as well as the sealing patch plate 12 and the protrusion 3, also depends on the vacuum setting inside the cabinet, so the sealing inside the cabinet will still be achieved.

[0053] When the cabinet needs to be opened, air is supplied into the cabinet. Under the action of the tension spring 15, the sealing patch plate 12 is driven to shrink and enter the sealing inner plate 7. At the same time, driven by the spring 16, the sealing inner plate 7 moves toward the inner cabinet door 2, thereby removing the obstruction of the sealing inner plate 7 to the opening of the cabinet door 2. At the same time, the airbag 5 is deflated and shrinks, thereby facilitating the opening of the cabinet door 2.

[0054] Of course, the above description is not limited to the above examples. Technical features not described in the invention can be achieved through or by adopting existing technologies, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of the invention and are not limitations of the invention. The invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the invention do not deviate from the purpose of the invention and should also fall within the scope of protection of the claims of the invention.

Claims

1. A method for using a mine flameproof and intrinsically safe high-voltage combined vacuum distribution cabinet, characterized in that: The following steps are involved: The cabinet door (2) hinged to the cabinet body is closed, and then an air pump is used to deliver air into the airbag (5). The airbag (5) is inflated by the air and enters the door gap through the first perforation, so that the airbag (5) is connected to the cabinet door (2) to form a first seal. The airbag (5) is connected to the sealing outer plate (4) through the second perforation to form a second seal, and at the same time, the airbag (5) is inflated into the cabinet inner cavity; Under the action of the first seal and the second seal, the distribution cabinet is initially sealed, and then the cabinet inner cavity is vacuumed. In the first air cavity (11), due to the setting of the first long hole (9), the air between the piston and the sealing inner plate (7) is evacuated, and the air in the first long hole (9) pushes the piston to move toward the door gap, so that the sealing inner plate (7) crosses the door gap and hits the protrusion, and the sealing inner plate (7) forms a third seal with the protrusion. During the movement, the sealing inner plate (7) squeezes the airbag (5), so that the airbag (5) hits the sealing inner plate (7), thereby achieving a fourth seal between the airbag (5) and the sealing inner plate (7). At the same time, the airbag (5) also expands to enter the through hole (6) and the channel (8), blocking the through hole (6) and the channel (8); When the sealing inner plates (7) on both sides move outward, under the action of the second long hole (13), the second piston (14) pushes the sealing patch (12) out, so that the sealing patch (12) covers the corner of the door gap, and the sealing patch (12) cooperates with the airbag (5) to seal, and at the same time, the sealing patch (12) cooperates with the protrusion (3) to form a sealing surface; After the vacuuming is completed, even if the airbag (5) ruptures, the airbag (5) is vacuum-absorbed into the through hole (6) and the channel (8), and the sealing is continued. At the same time, the third seal also relies on the vacuum setting inside the cabinet, so the sealing inside the cabinet will still be achieved. When the cabinet needs to be opened, air is supplied to the cabinet, and under the action of the tension spring (15), the sealing patch plate (12) is driven to enter the sealing inner plate (7). At the same time, under the drive of the spring reset device, the sealing inner plate (7) moves toward the inner cabinet door (2), thereby removing the obstruction of the sealing inner plate (7) to the opening of the cabinet door (2). At the same time, the air bag (5) is deflated and the air bag (5) is contracted, thereby facilitating the opening of the cabinet door (2); The cabinet body comprises a door frame (1) and a cabinet door (2); a sealing inner plate (7) located on the inner side of the door frame (1) and spanning the door gap is sealed and slidably connected to the cabinet door (2); an air bag (5) is provided in the door frame (1) and is sealed in cooperation with the sealing inner plate (7); the air bag (5) is connected to an air pump located outside the cabinet body; a plurality of first perforations communicating with the door gap are further provided on the door frame (1); the air bag (5) extends through the first perforations into the door gap; and after the air bag (5) is inflated, it blocks the gap between two adjacent first perforations; The cabinet door (2) is provided with a plurality of first air cavities (11) corresponding to the sealing inner plate (7), and a first piston (10) is slidably connected in the first air cavity (11) in the same sliding direction as the sealing inner plate (7). The first piston (10) is connected to the sealing inner plate (7) via a first connecting plate, and the first connecting plate seals and penetrates the first air cavity (11). The cabinet door (2) is also provided with a first long hole (9) connected to the first air cavity (11) and located between the first piston (10) and the sealing inner plate (7). The first long hole (9) is connected to the inner cavity of the cabinet body. The cabinet door (2) is also provided with a reset device for driving the sealing inner plate (7) to slide into the cabinet door (2); The door frame (1) is further provided with an inwardly protruding block (3), and the sealing inner plate (7) is pressed against the block (3) to form a sealing surface; The reset device comprises a plurality of first sliding cavities corresponding to the sealing inner plate (7), a spring (16) located in the first sliding cavity, and a slider (17) located between the sealing inner plate (7) and the spring (16) and slidably connected in the first sliding cavity, wherein the slider (17) is connected to the corresponding sealing inner plate (7) via the slider, and the slider (17) is connected to the first sliding cavity via the spring (16), and the extension direction of the spring (16) is the same as the movement direction of the sealing inner plate (7); The sealed inner plate (7) is further provided with a through hole (6) which passes through the sealed inner plate (7) and is located between the door gap and the protrusion (3); the airbag (5) extends into the through hole (6); the cabinet door (2) is further provided with a passage (8) which connects the door gap and the inner cavity of the cabinet; the airbag (5) expands into the passage (8) after expansion; The cabinet door (2) is also fixedly connected to a sealing outer plate (4) located outside the cabinet body, and a plurality of second perforations are provided on the outer surface of the door frame (1). After the airbag (5) is inflated, it is pressed against the sealing outer plate (4), and after the airbag (5) is inflated, the gap between two adjacent second perforations is blocked; A sealing patch (12) extending upward / downward is sealingly and slidingly connected on the top / bottom surface of the sealing inner plate located on the side. The sealing patch (12) is connected to the second piston (14) through a support plate. A second sliding cavity for sealing and sliding of the second piston (14) is provided in the sealing inner plate (7). A tension spring (15) for driving the second piston (14) to slide into the sealing inner plate (7) is provided in the second sliding cavity. A second long hole (13) located between the door gap and the second piston (14) is also provided in the second sliding cavity. The protrusion (3) is annular, and the sealing patch (12) is connected to the protrusion (3) to form a sealing surface.

2. The explosion-proof and intrinsically safe high-voltage combined vacuum distribution cabinet for mining according to claim 1 is characterized in that: Four sealing inner panels (7) are arranged corresponding to the four door gaps, and the length of the sealing inner panels (7) is adapted to the length of the corresponding door gaps. The sides of the upper sealing inner panel and the lower sealing inner panel are provided with sliding grooves for inserting the two side sealing inner panels. The airbag (5) is annular.

3. The explosion-proof and intrinsically safe high-voltage combined vacuum distribution cabinet for mining according to claim 1 is characterized in that: The four sealing outer panels (4) are arranged corresponding to the four door gaps, and the four sealing outer panels (4) are connected in sequence end to end.

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