Coal mine air shaft explosion door

Abstract

The invention provides a coal mine air shaft anti-explosion door which comprises a mounting plate, a door body and a door cover. The door body comprises a barrel arranged at the top of the mounting plate and communicated with the ventilation hole, and a door cover is arranged at the top of the barrel; a plurality of first buffer springs arranged in the barrel are arranged at the top of the mounting plate, a splitter plate is arranged at the tops of the first buffer springs, a plurality of air outlet holes are formed in the positions, corresponding to the splitter plate, of the side wall of the barrel, and air releasing assemblies are arranged in the air outlet holes; the ventilation assembly comprises an installation pipe which is arranged at the position, corresponding to the air outlet holes, of the side wall of the barrel, the two ends of the installation pipe are closed ends, a communication hole communicated with the air outlet holes is formed in the side, close to the barrel, of the installation pipe, a guide disc is arranged in the installation pipe, and a guide pipe penetrating through the installation pipe and with the two ends being closed ends is arranged on the side, away from the barrel, of the guide disc. The air purifier is reasonable in structure, long in service life and good in air dust pollution prevention effect.

Description

Technical Field

[0001] The present application relates to coal mine equipment, and in particular, to an explosion-proof door for a coal mine ventilation shaft. Background Art

[0002] The explosion-proof doors of the air shaft in coal mines are generally freely placed on the air shaft locking plates. When a gas or coal dust explosion occurs underground in the coal mine, the high-pressure airflow pushes open the air shaft explosion-proof doors. The air shaft explosion-proof doors can reduce the airflow pressure and thus protect the ventilator from damage.

[0003] In the prior art, when a gas or coal dust explosion occurs in a coal mine, the high-pressure airflow will push the explosion-proof door open, destroying it and shortening its service life. Moreover, tiny particles such as dust in the mine will diffuse into the air with the explosion, causing dust pollution in the air. Therefore, a coal mine explosion-proof door is urgently needed to solve the above problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of this application is to provide a coal mine ventilation shaft explosion-proof door to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the present application provides a coal mine ventilation shaft explosion-proof door, comprising:

[0006] A mounting plate, a ventilation hole is provided at the bottom of the mounting plate, and a door body is provided at the top of the mounting plate;

[0007] The door body comprises a cylinder body arranged on the top of the mounting plate and connected with the ventilation hole, and a door cover is arranged on the top of the cylinder body;

[0008] An exhaust pipe is arranged on the top of the door cover, and a buffer layer is arranged on the inner wall of the door cover;

[0009] A plurality of first buffer springs placed inside the cylinder are arranged on the top of the mounting plate, a diverter plate is arranged on the top of the plurality of first buffer springs, a plurality of air outlet holes are opened at positions of the cylinder side wall corresponding to the diverter plate, and a venting assembly is arranged inside the plurality of air outlet holes;

[0010] The air venting assembly includes a mounting tube which is arranged at a position on the side wall of the cylinder corresponding to the air outlet and has closed ends at both ends. A connecting hole connected to the air outlet is provided on the side of the mounting tube close to the cylinder, a guide plate is provided inside the mounting tube, and a guide tube which passes through the mounting tube and has closed ends at both ends is provided on the side of the guide plate away from the cylinder. A third buffer spring arranged inside the mounting tube is sleeved on the side wall of the guide tube, and air outlet grooves are symmetrically provided on the side wall of the mounting tube.

[0011] Furthermore, a mounting hole for connecting the air outlet hole with the connecting hole is provided on one side of the mounting tube close to the cylinder, a mesh plate is provided inside the mounting hole, and a second filter screen is provided on the side wall of the mesh plate.

[0012] Furthermore, the inner diameter of the mounting hole is larger than the inner diameter of the connecting hole, the inner diameter of the mounting hole is equal to the inner diameter of the air outlet hole, and the mesh plate matches the mounting hole.

[0013] Furthermore, a guide groove is provided at the bottom of the mounting plate, a guide plate is arranged inside the guide groove, a connecting column is provided at the top of the guide plate, which passes through the top of the mounting plate and is inserted into the first buffer spring and connected to the diverter plate, and a second buffer spring is provided on the side wall of the connecting column and is arranged inside the guide groove, a sealing baffle for limiting the guide plate is provided at the bottom of the mounting plate, a fastening bolt is provided between the sealing baffle and the mounting plate, and a sealing ring is provided at the connection between the connecting column and the mounting plate.

[0014] Furthermore, the side wall of the cylinder is provided with a driving assembly for pulling the guide tube laterally;

[0015] The driving assembly includes an electric push rod arranged on the side wall of the cylinder and placed directly above the mounting tube, a connecting plate is arranged on the telescopic shaft of the electric push rod, a connecting column inserted into the guide tube is arranged on the side wall of the connecting plate, a guide column placed in the guide tube is arranged on the side wall of the connecting column, and a buffer pad is arranged at the end of the guide column.

[0016] Furthermore, the diameter of the guide column is the same as the inner diameter of the guide tube, and the diameter of the guide column is larger than the diameter of the connecting column.

[0017] Furthermore, a pressure sensor is provided on the side wall of the exhaust duct, a PLC controller is provided on the top of the mounting plate, an A / D converter is provided at the input end of the PLC controller, a D / A converter is provided at the output end of the PLC controller, the pressure sensor is electrically connected to the A / D converter, and the electric push rod is electrically connected to the D / A converter.

[0018] Furthermore, the side wall of the door cover is provided with a plurality of handles.

[0019] Furthermore, a plurality of mounting bolts are arranged on the top of the mounting plate.

[0020] Furthermore, a flow guide cover is arranged at the end of the exhaust pipe, and a first filter screen is arranged inside the flow guide cover.

[0021] According to a coal mine air shaft explosion-proof door of the present application, when a gas or coal dust explosion accident occurs in the coal mine, the high-pressure airflow will enter the cylinder from the ventilation hole and impact the diverter plate. The diverter plate is connected to a plurality of first buffer springs, thereby buffering the high-pressure airflow. The high-pressure airflow moves circumferentially along the bottom surface of the diverter plate, thereby causing a portion of the high-pressure airflow to enter the plurality of air outlet holes and exert force on the guide plate, thereby causing the guide plate to move along the inner wall of the mounting tube. At this time, the third buffer spring contracts, causing the guide plate to move to the side away from the cylinder, and the high-pressure airflow flows out from the air outlet slot, thereby causing a portion of the high-pressure airflow to flow out from the air outlet slots connected to the plurality of circumferentially distributed air outlet holes, reducing the impact force of the high-pressure airflow on the door cover, thereby preventing the high-pressure airflow from pushing open the door cover and damaging the door body, thereby increasing the service life. The other portion of the high-pressure airflow is further buffered under the action of the buffer layer, thereby reducing the impact force of the high-pressure airflow on the door cover, and finally flows out from the exhaust pipe;

[0022] By using the second filter, it is convenient to filter impurities in the high-pressure airflow, thereby avoiding air dust pollution. By using the first filter, it is convenient to filter impurities in the high-pressure airflow flowing out of the air guide cover, thereby avoiding air dust pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0024] Figure 1 It is a three-dimensional diagram of a coal mine ventilation shaft explosion-proof door according to an embodiment of the present application;

[0025] Figure 2 According to an embodiment of the present application Figure 1 A magnified view of middle;

[0026] Figure 3 It is a front cross-sectional view of a coal mine ventilation shaft explosion-proof door according to an embodiment of the present application;

[0027] Figure 4 According to an embodiment of the present application Figure 3 Enlarged view of middle B;

[0028] Figure 5 is a schematic diagram of a control system according to an embodiment of the present application;

[0029] In the figure: 1, mounting plate; 101, mounting bolt; 102, ventilation hole; 2, air release assembly; 201, guide tube; 202, mounting tube; 2021, air outlet slot; 203, third buffer spring; 204, guide plate; 205, connecting hole; 3, driving assembly; 301, electric push rod; 302, connecting plate; 303, connecting column; 304, guide column; 305, buffer pad; 4, door body; 41, cylinder body; 411, Air outlet; 42, door cover; 5, handle; 6, pressure sensor; 7, exhaust duct; 8, guide cover; 81, first filter; 9, PLC controller; 10, buffer layer; 11, diverter plate; 12, connecting column; 121, second buffer spring; 13, first buffer spring; 14, sealing baffle; 15, guide plate; 16, fastening bolt; 17, guide groove; 18, second filter; 19, mesh plate; 20, mounting hole. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by this application easy to understand, this application is further explained below in conjunction with specific implementation methods.

[0031] like Figure 1 As shown, the present application provides a technical solution: a coal mine ventilation shaft explosion-proof door, comprising:

[0032] A mounting plate 1, a ventilation hole 102 is provided at the bottom of the mounting plate 1, and a door body 4 is provided at the top of the mounting plate 1;

[0033] The door body 4 includes a cylinder 41 disposed on the top of the mounting plate 1 and connected to the ventilation hole 102, a door cover 42 is disposed on the top of the cylinder 41, an external thread is disposed on the lower side of the annular side wall of the cylinder 41, and an internal thread is disposed on the mounting plate 1, and the cylinder 41 and the mounting plate 1 are connected by threads;

[0034] An exhaust pipe 7 is provided on the top of the door cover 42, and a buffer layer 10 is provided on the inner wall of the door cover 42;

[0035] A plurality of first buffer springs 13 disposed inside the cylinder 41 are arranged on the top of the mounting plate 1, a diverter plate 11 is arranged on the top of the plurality of first buffer springs 13, a plurality of air outlet holes 411 are opened at positions of the side wall of the cylinder 41 corresponding to the diverter plate 11, and a venting assembly 2 is arranged inside each of the plurality of air outlet holes 411;

[0036] The venting assembly 2 includes a mounting tube 202 which is arranged at a position corresponding to the air outlet hole 411 on the side wall of the cylinder 41 and has closed ends at both ends. A connecting hole 205 which is connected to the air outlet hole 411 is provided on the side of the mounting tube 202 close to the cylinder 41. A guide plate 204 is provided inside the mounting tube 202. A guide tube 201 which penetrates the mounting tube 202 and has closed ends at both ends is provided on the side of the guide plate 204 away from the cylinder 41. A third buffer spring 203 which is arranged inside the mounting tube 202 is sleeved on the side wall of the guide tube 201. Air outlet grooves 2021 are symmetrically provided on the side wall of the mounting tube 202. In this design, when a gas or coal dust explosion occurs in the coal mine, the high-pressure airflow will enter the cylinder 41 from the ventilation hole 102 and impact the diverter plate 11. The diverter plate 11 is connected to a plurality of first buffer springs 13, thereby The high-pressure airflow is buffered and moves circumferentially along the bottom surface of the diverter plate 11, so that a part of the high-pressure airflow enters the multiple air outlet holes 411 and applies force to the guide plate 204, so that the guide plate 204 moves along the inner wall of the mounting tube 202. At this time, the third buffer spring 203 contracts, causing the guide plate 204 to move to the side away from the cylinder 41, and the high-pressure airflow flows out from the air outlet slot 2021, so that a part of the high-pressure airflow flows out from the air outlet slot 2021 connected to the multiple circumferentially distributed air outlet holes 411, reducing the impact force of the high-pressure airflow on the door cover 42, thereby preventing the high-pressure airflow from pushing open the door cover 42 and damaging the door body 4, thereby increasing the service life. The other part of the high-pressure airflow is further buffered by the buffer layer 10, reducing the impact force of the high-pressure airflow on the door cover 42, and finally flows out from the exhaust pipe 7.

[0037] Reference Figure 3 and Figure 4 A mounting hole 20 for connecting the air outlet 411 with the connecting hole 205 is provided on one side of the mounting tube 202 close to the cylinder 41. A mesh plate 19 is provided inside the mounting hole 20. A second filter 18 is provided on the side wall of the mesh plate 19. This design facilitates filtering impurities in the high-pressure airflow by using the second filter 18, thereby avoiding air dust pollution. The mesh plate 19 is used to prevent the second filter 18 from being damaged, thereby increasing its service life.

[0038] Reference Figure 2 and Figure 4 The inner diameter of the mounting hole 20 is larger than the inner diameter of the connecting hole 205, the inner diameter of the mounting hole 20 is equal to the inner diameter of the air outlet hole 411, and the mesh plate 19 matches the mounting hole 20, which improves the rationality of the design.

[0039] Reference Figure 3The bottom of the mounting plate 1 is provided with a guide groove 17, a guide plate 15 is arranged inside the guide groove 17, a connecting column 12 is arranged on the top of the guide plate 15, and the connecting column 12 is inserted into the first buffer spring 13 and connected to the diverter plate 11. The side wall of the connecting column 12 is sleeved with a second buffer spring 121 arranged in the guide groove 17. The bottom of the mounting plate 1 is provided with a sealing baffle 14 for limiting the guide plate 15, and a fastening bolt 16 is arranged between the sealing baffle 14 and the mounting plate 1. A sealing ring is arranged at the connection between the connecting column 12 and the mounting plate 1. This design is to prevent the high When the high-pressure airflow is buffered, the diverter plate 11, under the action of the connecting column 12, drives the guide plate 15 to move inside the guide groove 17 to squeeze the second buffer spring 121, further buffering the high-pressure airflow, reducing the impact force of the high-pressure airflow on the door cover 42, thereby preventing the high-pressure airflow from pushing open the door cover 42 and damaging the door body 4, thereby improving the service life, and at the same time limiting the upward movement of the diverter plate 11. At the same time, under the action of the connecting column 12, the expansion and contraction stability of the first buffer spring 13 is improved, and the two ends of the first buffer spring 13 are fixedly connected to the diverter plate 11 and the mounting plate 1 respectively, and the fixed connection can be welding.

[0040] Reference Figure 2 and Figure 4 The side wall of the cylinder 41 is provided with a driving component 3 for laterally pulling the guide tube 201; the driving component 3 includes an electric push rod 301 arranged on the side wall of the cylinder 41 and placed just above the mounting tube 202, a connecting plate 302 is arranged on the telescopic shaft of the electric push rod 301, a connecting column 303 inserted into the inside of the guide tube 201 is arranged on the side wall of the connecting plate 302, a guide column 304 placed inside the guide tube 201 is arranged on the side wall of the connecting column 303, and a buffer pad 305 is arranged at the end of the guide column 304. This design drives the connecting plate 302 to move by the electric push rod 301 in the driving component 3, the connecting plate 302 moves to drive the guide column 304 to move, the guide column 304 moves to drive the guide tube 201 to move, the guide tube 201 moves to drive the guide plate 204 to move, and the guide plate 204 moves so that the air outlet slot 2021 leaks out to facilitate the outflow of high-pressure airflow, so that the air outlet slot 2021 can stably flow out high-pressure airflow.

[0041] Reference Figure 4 The diameter of the guide column 304 is the same as the inner diameter of the guide tube 201, and the diameter of the guide column 304 is larger than the diameter of the connecting column 303, which improves the rationality of the design.

[0042] Reference Figure 1 and Figure 5A pressure sensor 6 is provided on the side wall of the exhaust duct 7, a PLC controller 9 is provided on the top of the mounting plate 1, an A / D converter is provided on the input end of the PLC controller 9, a D / A converter is provided on the output end of the PLC controller 9, the pressure sensor 6 is electrically connected to the A / D converter, and the electric push rod 301 is electrically connected to the D / A converter. By using the pressure sensor 6, when it is detected that the outflowing high-pressure airflow is higher than the set value, the electric push rod 301 is operated to drive the connecting plate 302 to move, the connecting plate 302 moves to drive the guide column 304 to move, the guide column 304 moves to drive the guide pipe 201 to move, and the guide pipe 201 The movement drives the guide plate 204 to move, and the movement of the guide plate 204 allows the air outlet slot 2021 to leak out to facilitate the outflow of high-pressure airflow, so that the air outlet slot 2021 can stably flow out high-pressure airflow, so that the electric push rod 301 drives the guide plate 204 to move, and the air outlet area of ​​the air outlet slot 2021 is adjusted to the maximum and maintained, thereby accelerating the speed of high-pressure airflow outflow. Under the action of the connecting column 303 and the guide column 304, when the electric push rod 301 is not working, it will not affect the high-pressure airflow to push the movement of the guide plate 204. Among them, the pressure sensor 6, the PLC controller 9 and the electric push rod 301 are powered by an external power supply, which is a prior art.

[0043] Reference Figure 1 A plurality of handles 5 are provided on the side wall of the door cover 42. The handles 5 are used to facilitate the application of force to the door cover 42. A plurality of mounting bolts 101 are provided on the top of the mounting plate 1. The mounting bolts 101 are used to facilitate the installation operation of the mounting plate 1. A guide cover 8 is provided at the end of the exhaust duct 7. A first filter screen 81 is provided inside the guide cover 8. The first filter screen 81 is used to facilitate filtering impurities in the high-pressure airflow flowing out of the guide cover 8, thereby avoiding air dust pollution.

[0044] Reference Figure 1-Figure 5As an embodiment of the present application: when a gas or coal dust explosion occurs in a coal mine, the high-pressure airflow will enter the cylinder 41 from the ventilation hole 102 and impact the diverter plate 11. The diverter plate 11 is connected to a plurality of first buffer springs 13, thereby buffering the high-pressure airflow. At the same time, the diverter plate 11 drives the guide plate 15 to move in the guide groove 17 under the action of the connecting column 12 to squeeze the second buffer spring 121, further buffering the high-pressure airflow. The high-pressure airflow moves along the bottom surface of the diverter plate 11 in a circumferential distribution, so that a part of the high-pressure airflow enters the plurality of air outlet holes 411 to exert pressure on the guide plate 204. The force causes the guide plate 204 to move along the inner wall of the mounting tube 202. At this time, the third buffer spring 203 contracts, causing the guide plate 204 to move to the side away from the cylinder body 41, and the high-pressure airflow flows out from the air outlet slot 2021, so that a part of the high-pressure airflow flows out from the air outlet slot 2021 connected to a plurality of circumferentially distributed air outlet holes 411, reducing the impact force of the high-pressure airflow on the door cover 42, thereby preventing the high-pressure airflow from pushing open the door cover 42 and damaging the door body 4, thereby increasing the service life. The other part of the high-pressure airflow is further buffered by the buffer layer 10, reducing the impact force of the high-pressure airflow on the door cover 42, and finally flows out from the exhaust pipe 7.

[0045] When the pressure sensor 6 detects that the outflowing high-pressure airflow is higher than the set value, the electric push rod 301 is activated to drive the connecting plate 302 to move, the movement of the connecting plate 302 drives the guide column 304 to move, the movement of the guide column 304 drives the guide tube 201 to move, the movement of the guide tube 201 drives the guide plate 204 to move, the guide plate 204 moves so that the air outlet slot 2021 leaks out to facilitate the outflow of high-pressure airflow, and the air outlet slot 2021 can stably flow out high-pressure airflow, so that the electric push rod 301 drives the guide plate 204 to move, and the air outlet area of ​​the air outlet slot 2021 is adjusted to the maximum and maintained, thereby accelerating the speed of the high-pressure airflow outflow, and under the action of the connecting column 303 and the guide column 304, when the electric push rod 301 is not working, it will not affect the high-pressure airflow to drive the movement of the guide plate 204.

[0046] When the pressure sensor 6 detects that the outflowing high-pressure airflow is less than or equal to the set value, the electric push rod 301 is activated to drive the connecting plate 302 to move back to the initial position. When the high-pressure airflow has finished flowing out, the third buffer spring 203 rebounds and drives the guide plate 204 back to the initial position to block and seal the air outlet 411, so as to facilitate the subsequent buffering and release of the high-pressure airflow when a gas or coal dust explosion occurs in the coal mine, thereby preventing the high-pressure airflow from pushing open the door cover 42 and damaging the door body 4, thereby increasing the service life.

[0047] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present application is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A coal mine ventilation shaft explosion-proof door, comprising: A mounting plate (1), wherein a ventilation hole (102) is provided at the bottom of the mounting plate (1), and a door body (4) is provided at the top of the mounting plate (1); The door body (4) comprises a cylinder (41) arranged on the top of the mounting plate (1) and connected to the ventilation hole (102), and a door cover (42) is arranged on the top of the cylinder (41); An exhaust pipe (7) is arranged on the top of the door cover (42), and a buffer layer (10) is arranged on the inner wall of the door cover (42); It is characterized in that A plurality of first buffer springs (13) disposed inside the cylinder (41) are arranged on the top of the mounting plate (1), a diverter plate (11) is arranged on the top of the plurality of first buffer springs (13), a plurality of air outlet holes (411) are opened at positions of the side wall of the cylinder (41) corresponding to the diverter plate (11), and a venting assembly (2) is arranged inside each of the plurality of air outlet holes (411); The air venting assembly (2) comprises a mounting tube (202) which is arranged at a position on the side wall of the cylinder (41) corresponding to the air outlet hole (411) and has closed ends at both ends; a connecting hole (205) which is connected to the air outlet hole (411) is provided on a side of the mounting tube (202) close to the cylinder (41); a guide plate (204) is provided inside the mounting tube (202); a guide tube (201) which passes through the mounting tube (202) and has closed ends at both ends is provided on a side of the guide plate (204) away from the cylinder (41); a third buffer spring (203) which is arranged inside the mounting tube (202) is sleeved on the side wall of the guide tube (201); and air outlet slots (2021) are symmetrically provided on the side wall of the mounting tube (202).

2. A coal mine ventilation shaft explosion-proof door according to claim 1, characterized in that: A mounting hole (20) for connecting the air outlet hole (411) with the connecting hole (205) is provided on one side of the mounting tube (202) close to the cylinder (41), a mesh plate (19) is provided inside the mounting hole (20), and a second filter screen (18) is provided on the side wall of the mesh plate (19).

3. A coal mine ventilation shaft explosion-proof door according to claim 2, characterized in that: The inner diameter of the mounting hole (20) is greater than the inner diameter of the connecting hole (205), the inner diameter of the mounting hole (20) is equal to the inner diameter of the air outlet hole (411), and the mesh plate (19) matches the mounting hole (20).

4. The explosion-proof door for coal mine ventilation shaft according to claim 1, characterized in that: A guide groove (17) is provided at the bottom of the mounting plate (1), a guide plate (15) is arranged inside the guide groove (17), a connecting column (12) is provided at the top of the guide plate (15), the connecting column (12) passes through the top of the mounting plate (1) and is inserted into the first buffer spring (13) and connected to the diverter plate (11), a second buffer spring (121) arranged in the guide groove (17) is sleeved on the side wall of the connecting column (12), a first sealing baffle (14) for limiting the guide plate (15) is provided at the bottom of the mounting plate (1), a fastening bolt (16) is provided between the first sealing baffle (14) and the mounting plate (1), and a sealing ring is provided at the connection between the connecting column (12) and the mounting plate (1).

5. The explosion-proof door for coal mine ventilation shaft according to claim 1, characterized in that: The side wall of the cylinder (41) is provided with a driving assembly (3) for pulling the guide tube (201) laterally; The driving assembly (3) comprises an electric push rod (301) arranged on the side wall of the cylinder (41) and placed directly above the mounting tube (202); a connecting plate (302) is arranged on the telescopic shaft of the electric push rod (301); a connecting column (303) inserted into the interior of the guide tube (201) is arranged on the side wall of the connecting plate (302); a guide column (304) placed in the interior of the guide tube (201) is arranged on the side wall of the connecting column (303); and a buffer pad (305) is arranged at the end of the guide column (304).

6. A coal mine ventilation shaft explosion-proof door according to claim 5, characterized in that: The diameter of the guide column (304) is the same as the inner diameter of the guide tube (201), and the diameter of the guide column (304) is greater than the diameter of the connecting column (303).

7. The explosion-proof door for coal mine ventilation shaft according to claim 5, characterized in that: A pressure sensor (6) is arranged on the side wall of the exhaust duct (7), a PLC controller (9) is arranged on the top of the mounting plate (1), an A / D converter is arranged at the input end of the PLC controller (9), a D / A converter is arranged at the output end of the PLC controller (9), the pressure sensor (6) is electrically connected to the A / D converter, and the electric push rod (301) is electrically connected to the D / A converter.

8. The explosion-proof door for coal mine ventilation shaft according to claim 1, characterized in that: The side wall of the door cover (42) is provided with a plurality of handles (5).

9. The explosion-proof door for coal mine ventilation shaft according to claim 1, characterized in that: A plurality of mounting bolts (101) are arranged on the top of the mounting plate (1).

10. The explosion-proof door for coal mine ventilation shaft according to claim 2, characterized in that: The end of the exhaust pipe (7) is provided with a flow guide cover (8), and a first filter screen (81) is provided inside the flow guide cover (8).

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