Coal mine underground air door locking device

Abstract

The invention discloses a coal mine underground air door locking device which comprises an air door A, an air door B and a door frame arranged outside the air door A and the air door B. The air door A and the air door B are connected with a locking mechanism A and a locking mechanism B respectively. The locking mechanism A and the locking mechanism B each comprise a sliding groove formed in the door frame located at the upper end, a limiting moving plate is installed in each sliding groove, and the lower surface of each limiting moving plate is connected with a horizontal inserting plate through a round stand column. The upper end of the air door A and the upper end of the air door B are each provided with a connecting protrusion, the connecting protrusions are movably connected with the round stand column through movable connecting rods, the upper ends of the air door A and the air door B are provided with first buckle plates with inserting holes on the outer sides of the connecting protrusions, and the air door A or the air door B can pull the limiting moving plate to move along the sliding groove body when opened. And the horizontal inserting plate is inserted into the first buckling plate with the inserting hole on the air door B or the air door A. When one air door is opened, the other air door can be automatically fixed.

Description

Technical Field

[0001] The invention relates to the technical field of air door locking devices, and in particular to an air door locking device in an underground coal mine. Background Art

[0002] The damper is the main ventilation structure in the coal mine that can block the wind flow but allow vehicles and pedestrians to pass through. Its function is to ensure that the wind flow in the mine flows along the specified route and direction and to control the wind flow. In order to avoid short circuit of wind flow and damage to the entire ventilation system when the damper is opened, at least two dampers need to be set in the same tunnel and locked. At the same time, the safety of pedestrians and vehicles passing through the damper is also ensured.

[0003] However, most of the current underground damper locking devices are respectively equipped with locking mechanisms on two dampers, and the locking mechanisms of the two dampers are independently controlled. When the locking mechanism of one damper is adjusted so that the damper can be opened, the locking mechanism of the other damper needs to be adjusted so that the damper can remain closed. In other words, the existing underground damper locking devices need to control the locking and opening of the two dampers separately. Once a control error occurs, the locking mechanisms of the two dampers will be opened at the same time, and the two dampers will be opened at the same time, resulting in a short circuit in the airflow. Summary of the invention

[0004] The purpose of the present invention is to provide a damper locking device for underground coal mines to solve the technical problem in the prior art that once a control error occurs, the locking mechanisms of the two dampers will be opened at the same time, and the two dampers will be opened at the same time to cause airflow short circuit.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A damper locking device for underground coal mines, comprising dampers A and B, and door frames arranged outside the dampers A and B, wherein the door frames at the upper ends of the dampers A and B are provided with locking mechanisms A connected to the dampers A and B connected to the dampers B respectively;

[0007] The locking mechanism A and the locking mechanism B both include a sliding groove body arranged on the door frame at the upper end, a limited movable plate is installed inside the sliding groove body, and a horizontal plug plate is connected to the lower surface of the limited movable plate through a round column;

[0008] The upper ends of the dampers A and B are both provided with connecting protrusions, and the connecting protrusions are respectively movably connected to the round pillars through movable connecting rods. The upper ends of the dampers A and B are provided with first buckle plates with plug holes on the outer sides of the connecting protrusions. When the damper A or the damper B is opened, the limit movable plate can be pulled to move along the sliding groove body, so that the horizontal plug plate is inserted into the first buckle plate with the plug hole on the damper B or the damper A, so as to realize automatic fixation of the damper B or the damper A.

[0009] Furthermore, the movable connecting rod installed on the damper A and the damper B has a bent section, so that the movable connecting rod is not blocked by the connecting protrusion and the first buckle plate when the damper A and the damper B are closed.

[0010] As a preferred solution of the present invention, the sliding groove body is integrally formed with the upper end of the door frame, a rectangular three-dimensional groove is provided inside the sliding groove body, and a linear opening connected to the rectangular three-dimensional groove is provided on the lower surface of the sliding groove body, and the width of the rectangular three-dimensional groove is greater than the width of the linear opening;

[0011] The limit movable plate is divided into a sliding clamping plate in the rectangular three-dimensional slot and an anti-slant clamping plate in the linear opening, and the circular column is installed at the center position of the lower surface of the anti-slant clamping plate.

[0012] As a preferred solution of the present invention, one end of the movable connecting rod is mounted on the circular column through a rotating bearing, and the other end of the movable connecting rod is mounted on the connecting protrusion through a rotating bearing;

[0013] The limit movable plate, the round column and the horizontal plug plate are an integrated structure. The horizontal plug plate is distributed in parallel with the limit movable plate, and the horizontal plug plate faces the upper center position of the door frame.

[0014] As a preferred solution of the present invention, the bent section of the movable connecting rod installed on the damper A is close to the installation position of the damper A, and the bent section of the movable connecting rod connected to the damper A is used to bypass the connecting protrusion and the first gusset plate installed on the damper B;

[0015] The bent section of the movable connecting rod installed on the damper B is close to the installation position of the damper B, and the bent section of the movable connecting rod connected to the damper B is used to bypass the connecting protrusion and the first gusset plate installed on the damper A;

[0016] Wherein, the bending direction of the bending section of the movable connecting rod installed on the damper A and the bending direction of the bending section of the movable connecting rod installed on the damper B are opposite.

[0017] As a preferred solution of the present invention, the door frame is provided with a second gusset plate with a plug hole above the damper A and the damper B, and the second gusset plate is respectively located between the connecting protrusion of the damper A and the first gusset plate and between the connecting protrusion of the damper B and the first gusset plate;

[0018] When the damper A and the damper B are opened at the same time, the movable connecting rod is used to pull the horizontal plug plate and insert it into the second gusset plate to fix the damper A and the damper B.

[0019] As a preferred solution of the present invention, the upper end of the door frame is hinged with sealing curtain plates located on both sides of the air door A and the air door B respectively, and the upper end of the door frame is equipped with a driving assembly for pulling the sealing curtain plates to rotate, and the driving assembly is connected to the sealing curtain plates through a pull rope;

[0020] When the driving component drives the pull rope to reel in, the sealing curtain plate is driven to rotate until it is separated from the damper A and the damper B. When the driving component drives the pull rope to unwind, the sealing curtain plate is driven to rotate until it is against the damper A and the damper B.

[0021] As a preferred solution of the present invention, the sealing curtain plate is divided into an upper straight plate and a lower collecting plate, the upper straight plate and the lower collecting plate form an obtuse angle structure, the side surface of the lower collecting plate is in close contact with the surface of the damper A and the damper B, and a ventilation space is formed between the upper ends of the dampers A and B and the upper ends of the door frames, and the sealing curtain plate is rotated to abut against the dampers A and B to block the ventilation space.

[0022] As a preferred solution of the present invention, the horizontal plug plate includes a three-dimensional block installed at the lower end of the circular column, and a double-head plug plate arranged on the side of the three-dimensional block, there is a redundant gap between the double-head plug plates, the double-head plug plates are elastic, and the double-head plug plates are squeezed by the first gusset plate or the second gusset plate to shrink toward the redundant gap, so that the three-dimensional block can be inserted into the first gusset plate or the second gusset plate;

[0023] The outer sides of the double-head plug board are respectively provided with extension card boards, the ends of the extension card boards are arc-surface structures, and the distance between the two extension card boards in a non-pressurized state is greater than the insertion hole width of the first buckle plate or the second buckle plate.

[0024] As a preferred solution of the present invention, the upper end of the door frame is provided with a third gusset plate with a plug hole on the outer side of the damper A and the damper B respectively, and the other side of the three-dimensional block at the lower end of the round column is also provided with a double-head plug plate;

[0025] When the damper A is closed, the double-ended plug plate is inserted into the third gusset plate outside the damper B, and the damper A is locked by the fixing effect between the third gusset plate and the double-ended plug plate;

[0026] When the damper B is closed, the double-ended plug plate is inserted into the third buckle plate outside the damper A, and the damper B is locked by the fixing effect between the third buckle plate and the double-ended plug plate.

[0027] As a preferred solution of the present invention, the second buckle plate and the third buckle plate are installed on the lower end surface of the sliding groove body, and the lower end surface of the sliding groove body is provided with an outer plate at the position of the second buckle plate and the third buckle plate, and the outer plate is used to reinforce the second buckle plate and the third buckle plate.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention can realize the independent opening and closing of two dampers, wherein when the two dampers are independently opened, the other damper can be automatically locked, thereby ensuring that after one damper is opened, the other damper is automatically locked and cannot be opened, thereby preventing the two dampers from being opened at the same time and causing airflow short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0031] Figure 1 It is a front schematic diagram of a damper locking device according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the installation structure of the locking mechanism and the door frame according to an embodiment of the present invention;

[0033] Figure 3 is a schematic top view of the locking mechanism of an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the top view of the structure when the damper A of the embodiment of the present invention is opened alone;

[0035] Figure 5 It is a schematic diagram of the top view of the structure when the damper B of the embodiment of the present invention is opened alone;

[0036] Figure 6 It is a schematic diagram of the top view of the structure when the damper A and the damper B of the embodiment of the present invention are opened at the same time;

[0037] Figure 7 A schematic structural diagram of a sealing curtain plate according to an embodiment of the present invention;

[0038] The numbers in the figure represent the following:

[0039] 1-door frame; 2-locking mechanism A; 3-locking mechanism B; 4-sliding trough; 5-limiting movable plate; 6-round column; 7-horizontal plug plate; 8-connecting protrusion; 9-movable connecting rod; 10-first buckle plate; 11-bend section; 12-rectangular three-dimensional slot; 13-linear opening; 14-rotating bearing; 15-second buckle plate; 16-sealing curtain plate; 17-driving assembly; 18-pull rope; 19-third buckle plate;

[0040] 51-sliding card plate; 52-anti-slant card plate;

[0041] 71- three-dimensional block; 72- double-head plug board; 73- extension card board;

[0042] 161-upper straight board; 162-lower retracted board. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0044] like Figure 1 and Figure 2 As shown, the present invention provides a damper locking device for an underground coal mine, comprising dampers A and B, and a door frame 1 arranged outside the dampers A and B, and the door frame 1 at the upper ends of the dampers A and B is provided with a locking mechanism A2 connected to the damper A and a locking mechanism B3 connected to the damper B respectively.

[0045] The locking mechanism A2 and the locking mechanism B3 both include a sliding groove body 4 arranged at the upper end of the door frame 1, a limited movable plate 5 is installed inside the sliding groove body 4, and the lower surface of the limited movable plate 5 is connected to a horizontal plug plate 7 through a round column 6.

[0046] like Figures 3 to 6As shown, the upper ends of the dampers A and B are provided with connecting protrusions 8, and the connecting protrusions 8 are movably connected to the round columns 6 through movable connecting rods 9 respectively. The upper ends of the dampers A and B are provided with first buckle plates 10 with plug holes on the outside of the connecting protrusions 8. When the damper A or the damper B is opened, the limiting movable plate 5 can be pulled to move along the sliding groove body 4, so that the horizontal plug plate 7 is inserted into the first buckle plate 10 with a plug hole on the damper B or the damper A, thereby realizing automatic fixation of the damper B or the damper A.

[0047] Furthermore, the movable connecting rod 9 installed on the damper A and the damper B has a bent section 11, so that the movable connecting rod 9 is not blocked by the connecting protrusion 8 and the first pinch plate 10 when the damper A and the damper B are closed.

[0048] In this embodiment, in order to prevent the airflow short circuit caused by opening two air gates at the same time, a locking device is installed between the two air gates in the coal mine. When one air gate is opened, the other air gate cannot be opened. A locking mechanism A2 is installed on air gate A and a locking mechanism B3 is installed on air gate B.

[0049] Among them, when the damper A is opened, the damper A uses the movable connecting rod 9 to drive the limiting movable plate 5 to move along the sliding groove 4 and move toward the center position of the door frame 1. When the damper A is opened to be fixed, the horizontal plug plate 7 on the locking mechanism A2 can be inserted into the first buckle plate 10 at the upper end of the damper B. At this time, the damper A is opened, and the damper B is fixed while the damper A is opened.

[0050] Similarly, when the damper B is opened, the damper B uses the movable connecting rod 9 to drive the limiting movable plate 5 to move along the sliding groove 4 and move toward the center position of the door frame 1. When the damper B is opened to be fixed, the horizontal plug plate 7 on the locking mechanism B3 can be inserted into the first buckle plate 10 at the upper end of the damper A. At this time, the damper B is opened, and the damper A is fixed while the damper B is opened.

[0051] It should be particularly noted that, in this embodiment, in order to avoid the mutual restraint and influence of the locking mechanism A2 and the locking mechanism B3 when the dampers A and B are opened, the opening directions of the dampers A and B are opposite, and the bent section 11 on the movable connecting rod 9 connected to the damper A is located on the outside of the connecting protrusion 8 and the first buckle plate 10 of the damper B, and the bent section 11 on the movable connecting rod 9 connected to the damper B is located on the outside of the connecting protrusion 8 and the first buckle plate 10 of the damper A.

[0052] The bent section 11 of the movable connecting rod 9 installed on the damper A is close to the installation position of the damper A, and the bent section 11 of the movable connecting rod 9 connected to the damper A is used to bypass the connecting protrusion 8 and the first buckle plate 10 installed on the damper B.

[0053] The bent section 11 of the movable connecting rod 9 installed on the damper B is close to the installation position of the damper B, and the bent section 11 of the movable connecting rod 9 connected to the damper B is used to bypass the connecting protrusion 8 and the first buckle plate 10 installed on the damper A.

[0054] Specifically, Figure 2 As shown, the sliding groove body 4 is integrally formed with the upper end of the door frame 1, a rectangular three-dimensional groove 12 is provided inside the sliding groove body 4, and a linear opening 13 connected to the rectangular three-dimensional groove 12 is provided on the lower surface of the sliding groove body 4, and the width of the rectangular three-dimensional groove 12 is greater than the width of the linear opening 13.

[0055] The limit movable plate 5 is divided into a sliding clamping plate 51 in the rectangular three-dimensional slot 12 and an anti-slant clamping plate 52 in the linear opening 13 , and the round column 6 is installed at the center position of the lower surface of the anti-slant clamping plate 52 .

[0056] The limit movable plate 5 , the round column 6 and the horizontal plug plate 7 are an integrated structure. The horizontal plug plate 7 is parallel to the limit movable plate 5 , and the horizontal plug plate 7 faces the upper center position of the door frame 1 .

[0057] In order to ensure that the dampers A and B can open and close the doors more smoothly, one end of the movable connecting rod 9 is installed on the round column 6 through a rotating bearing 14, and the other end of the movable connecting rod 9 is installed on the connecting protrusion 8 through a rotating bearing 14.

[0058] The bending direction of the bending section 11 of the movable connecting rod 9 installed on the damper A and the bending direction of the bending section 11 of the movable connecting rod 9 installed on the damper B are opposite.

[0059] When a fire, gas outburst or other accident occurs in a coal mine, the disaster ventilation system needs to be adjusted. Underground personnel need to enter the disaster area to unlock the damper and open the two dampers at the same time to promptly guide the smoke and toxic and harmful gases into the return air lane, reduce the area affected by the accident, and reduce the economic losses and casualties of the mine. The entry of underground personnel into the disaster area increases the risk of casualties, so it is necessary to open damper A and damper B at the same time.

[0060] The door frame 1 is provided with a second buckle plate 15 with a plug hole above the dampers A and B. The second buckle plate 15 is located between the connecting protrusion 8 of the damper A and the first buckle plate 10 and between the connecting protrusion 8 of the damper B and the first buckle plate 10 respectively.

[0061] When the dampers A and B are opened at the same time, the movable connecting rod 9 is used to pull the horizontal plug plate 7 to be inserted into the second buckle plate 15, so that the dampers A and B are fixed.

[0062] In this embodiment, there is a gap between the damper A and the damper B and the door frame at the upper end thereof, and the gap is used to accommodate the locking mechanism A2 and the locking mechanism B3, but there is a certain flow gap, so in order to close the gap, as shown in FIG. Figure 7 As shown, the upper end of the door frame 1 is hinged with sealing curtain plates 16 located on both sides of the air door A and the air door B respectively. The upper end of the door frame 1 is installed with a driving component 17 for pulling the sealing curtain plate 16 to rotate. The driving component 17 is connected to the sealing curtain plate 16 through a pull rope 18.

[0063] When the driving assembly 17 drives the pull rope 18 to reel in, the sealing curtain plate 16 is driven to rotate to disengage from the damper A and the damper B. When the driving assembly 17 drives the pull rope 18 to unwind, the sealing curtain plate 16 is driven to rotate to abut against the damper A and the damper B.

[0064] The sealing curtain plate 16 is divided into an upper straight plate 161 and a lower collecting plate 162. The upper straight plate 161 and the lower collecting plate 162 form an obtuse angle structure. The side surface of the lower collecting plate 162 is in close contact with the surface of the damper A and the damper B. A ventilation space is formed between the upper ends of the dampers A and B and the upper end of the door frame 1. When the sealing curtain plate 16 is rotated to abut against the dampers A and B, the ventilation space is blocked.

[0065] Furthermore, it should be noted that a fixing structure is provided on the rotating shaft of the damper A and the damper B, which can realize fixing after the damper A and the damper B are rotated to a certain angle.

[0066] When the damper A and the damper B are opened at the same time, in order to realize the auxiliary locking of the damper A and the damper B, a second pinch plate 15 is installed on the door frame 1 at the upper end. When the damper A or the damper B is opened alone, in order to realize the locking work of the damper B or the damper A, a first pinch plate 10 is arranged on the upper end of the damper A and the damper B. In order to realize the fixing work between the horizontal plug plate 7 and the second pinch plate 15, and the horizontal plug plate 7 and the first pinch plate 10, the structure of the horizontal plug plate 7 is designed as follows:

[0067] like Figure 2 As shown, the horizontal plug plate 7 includes a three-dimensional block 71 installed at the lower end of the circular column 6, and a double-headed plug plate 72 arranged on the side of the three-dimensional block 71. There is a redundant gap between the double-headed plug plates 72. The double-headed plug plates 72 are elastic. The double-headed plug plates 72 are squeezed by the first buckle plate 10 or the second buckle plate 15 to shrink toward the redundant gap, so that the three-dimensional block 71 can be inserted into the first buckle plate 10 or the second buckle plate 15.

[0068] The outer sides of the double-head plug plate 72 are respectively provided with an extension card plate 73, the ends of the extension card plate 73 are arc-surface structures, and the distance between the two extension card plates 73 in the unpressed state is greater than the insertion hole width of the first buckle plate 10 or the second buckle plate 15.

[0069] In this embodiment, when the horizontal plug plate 7 is driven to insert into the first buckle plate 10 or the second buckle plate 15, the insertion hole of the first buckle plate 10 or the second buckle plate 15 squeezes the arc structure of the extended card plate 73, so that the double-headed plug plate 72 shrinks toward the redundant interval until the double-headed plug plate 72 completely passes through the insertion hole of the first buckle plate 10 or the second buckle plate 15. At this time, the double-headed plug plate 72 is reset in a non-pressurized state, and the three-dimensional block 71 is inserted into the insertion hole of the first buckle plate 10 or the second buckle plate 15. Since the spacing between the two extended card plates 73 in a non-pressurized state is greater than the insertion hole width of the first buckle plate 10 or the second buckle plate 15, the horizontal plug plate 7 and the first buckle plate 10 or the second buckle plate 15 are fixed in a natural state.

[0070] In order to further ensure that damper A and damper B are locked when closed, the upper end of the door frame 1 is provided with a third buckle plate 19 with a socket on the outer side of damper A and damper B, and the other side of the three-dimensional block 71 at the lower end of the circular column 6 is also provided with a double-head plug plate 72.

[0071] like Figure 6 As shown, when the damper A is closed, the double-ended plug plate 72 is inserted into the third buckle plate 19 outside the damper B, and the damper A is locked by the fixing effect between the third buckle plate 19 and the double-ended plug plate 72.

[0072] When the damper B is closed, the double-ended plug plate 72 is inserted into the third buckle plate 19 outside the damper A, and the damper B is locked by the fixing effect between the third buckle plate 19 and the double-ended plug plate 72.

[0073] The second buckle plate 15 and the third buckle plate 19 are installed on the lower end surface of the sliding groove body 4. The lower end surface of the sliding groove body 4 is provided with an outer plate at the position of the second buckle plate 15 and the third buckle plate 19. The outer plate is used to reinforce the second buckle plate 15 and the third buckle plate 19.

[0074] Therefore, this embodiment can realize the independent opening and closing of the two dampers, and when the two dampers are opened independently, the other damper can be automatically locked, thereby ensuring that after one damper is opened, the other damper is automatically locked and cannot be opened, thereby preventing the two dampers from being opened at the same time and causing a short circuit in the airflow. When the two dampers need to be opened at the same time, the two opened dampers can also be locked to ensure that the two dampers are in a stably open state.

[0075] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A damper locking device for underground coal mines, characterized in that: The invention comprises a damper A and a damper B, and a door frame (1) arranged outside the damper A and the damper B, wherein the door frame (1) located at the upper end of the damper A and the damper B is provided with a locking mechanism A (2) connected to the damper A and a locking mechanism B (3) connected to the damper B respectively; The locking mechanism A (2) and the locking mechanism B (3) both comprise a sliding groove (4) arranged on the door frame (1) at the upper end, a limited movable plate (5) being installed inside the sliding groove (4), and a horizontal plug plate (7) being connected to the lower surface of the limited movable plate (5) via a round column (6); The upper ends of the damper A and the damper B are both provided with a connecting protrusion (8), and the connecting protrusion (8) is movably connected to the circular column (6) through a movable connecting rod (9). The upper ends of the damper A and the damper B are provided with a first buckle plate (10) with a plug hole on the outer side of the connecting protrusion (8). When the damper A or the damper B is opened, the limit movable plate (5) can be pulled to move along the sliding groove body (4), so that the horizontal plug plate (7) is inserted into the first buckle plate (10) with a plug hole on the damper B or the damper A, thereby realizing automatic fixing of the damper B or the damper A; Furthermore, the movable connecting rod (9) installed on the damper A and the damper B has a bent section (11), so that the movable connecting rod (9) is not blocked by the connecting protrusion (8) and the first buckle plate (10) when the damper A and the damper B are closed.

2. A coal mine underground air door locking device according to claim 1, characterized in that: The sliding groove body (4) is integrally formed with the upper end of the door frame (1); a rectangular three-dimensional slot (12) is provided inside the sliding groove body (4); and a linear opening (13) communicating with the rectangular three-dimensional slot (12) is provided on the lower surface of the sliding groove body (4); the width of the rectangular three-dimensional slot (12) is greater than the width of the linear opening (13); The limit movable plate (5) is divided into a sliding clamping plate (51) located in the rectangular three-dimensional slot (12) and an anti-slant clamping plate (52) located in the linear opening (13), and the circular column (6) is installed at the center position of the lower surface of the anti-slant clamping plate (52).

3. A coal mine underground air door locking device according to claim 1, characterized in that: One end of the movable connecting rod (9) is mounted on the circular column (6) via a rotating bearing (14), and the other end of the movable connecting rod (9) is mounted on the connecting protrusion (8) via a rotating bearing (14); The limit movable plate (5), the circular column (6) and the horizontal plug plate (7) are an integrated structure; the horizontal plug plate (7) is arranged in parallel with the limit movable plate (5), and the horizontal plug plate (7) faces the upper center position of the door frame (1).

4. A coal mine underground air door locking device according to claim 1, characterized in that: The bent section (11) of the movable connecting rod (9) installed on the damper A is close to the installation position of the damper A, and the bent section (11) of the movable connecting rod (9) connected to the damper A is used to bypass the connecting protrusion (8) and the first pinch plate (10) installed on the damper B; The bent section (11) of the movable connecting rod (9) installed on the damper B is close to the installation position of the damper B, and the bent section (11) of the movable connecting rod (9) connected to the damper B is used to bypass the connecting protrusion (8) and the first pinch plate (10) installed on the damper A; Wherein, the bending direction of the bending section (11) of the movable connecting rod (9) installed on the damper A is opposite to the bending direction of the bending section (11) of the movable connecting rod (9) installed on the damper B.

5. The air door locking device for underground coal mine according to claim 1, characterized in that: The door frame (1) is provided with a second pinch plate (15) having a plug hole above the damper A and the damper B, and the second pinch plate (15) is respectively located between the connecting protrusion (8) of the damper A and the first pinch plate (10) and between the connecting protrusion (8) of the damper B and the first pinch plate (10); When the damper A and the damper B are opened simultaneously, the movable connecting rod (9) is used to pull the horizontal plug plate (7) and insert it into the second buckle plate (15), thereby fixing the damper A and the damper B.

6. A coal mine underground air door locking device according to claim 5, characterized in that: The upper end of the door frame (1) is hinged with sealing curtain plates (16) respectively located on the two sides of the air door A and the air door B. The upper end of the door frame (1) is equipped with a driving assembly (17) for pulling the sealing curtain plate (16) to rotate. The driving assembly (17) is connected to the sealing curtain plate (16) through a pull rope (18); When the driving component (17) drives the pull rope (18) to reel in, the sealing curtain plate (16) is driven to rotate until it is separated from the damper A and the damper B. When the driving component (17) drives the pull rope (18) to unreel, the sealing curtain plate (16) is driven to rotate until it is against the damper A and the damper B.

7. A coal mine air door locking device according to claim 6, characterized in that: The sealing curtain plate (16) is divided into an upper straight plate (161) and a lower collecting plate (162), wherein the upper straight plate (161) and the lower collecting plate (162) form an obtuse angle structure, wherein the side surface of the lower collecting plate (162) is in close contact with the surfaces of the dampers A and B, and a ventilation space is formed between the upper ends of the dampers A and B and the upper end of the door frame (1), and the sealing curtain plate (16) is rotated to abut against the dampers A and B to block the ventilation space.

8. The air door locking device for underground coal mines according to claim 1, characterized in that: The horizontal plug plate (7) comprises a three-dimensional block (71) mounted at the lower end of the circular column (6), and a double-head plug plate (72) arranged on the side of the three-dimensional block (71), a redundant space is provided between the double-head plug plates (72), the double-head plug plates (72) are elastic, and the double-head plug plates (72) are squeezed by the first gusset plate (10) or the second gusset plate (15) to shrink toward the redundant space, so that the three-dimensional block (71) can be inserted into the first gusset plate (10) or the second gusset plate (15); An extension card plate (73) is provided on the outer side of the double-head plug plate (72), the end of the extension card plate (73) is a curved surface structure, and the distance between the two extension card plates (73) in a non-pressurized state is greater than the insertion hole width of the first buckle plate (10) or the second buckle plate (15).

9. A coal mine underground air door locking device according to claim 8, characterized in that: The upper end of the door frame (1) is provided with a third buckle plate (19) with a plug hole on the outer sides of the damper A and the damper B respectively, and the other side surface of the three-dimensional block (71) at the lower end of the circular column (6) is also provided with a double-head plug plate (72); When the damper A is closed, the double-ended plug plate (72) is inserted into the third buckle plate (19) outside the damper B, and the damper A is locked by the fixing effect between the third buckle plate (19) and the double-ended plug plate (72); When the damper B is closed, the double-ended plug plate (72) is inserted into the third buckle plate (19) outside the damper A, and the damper B is locked by the fixing effect between the third buckle plate (19) and the double-ended plug plate (72).

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