Coal mine underground air door convenient to adjust

Abstract

The utility model relates to a coal mine underground air door convenient to adjust, and belongs to the technical field of coal mine underground air doors. Comprising two air doors installed on the inner side of an air door frame, square through grooves are formed in the surfaces of the air doors in a penetrating mode, square bases are fixedly connected into the square through grooves, and ventilation openings are formed in the surfaces of the square bases in a penetrating mode. Through the arrangement of the single driving pieces, the single group of wind shielding blades can be independently driven to rotate, then part of the single driving pieces are flexibly selected to be connected with the main driving piece according to the actual ventilation requirement, and then the main driving piece uniformly drives the part of the single driving pieces to operate, so that the rotation operation of the part of the wind shielding blades is realized. And the single driving pieces which are not connected with the main driving piece do not operate, and the wind blocking blades of the part are in a closed state. By selecting a proper number of single driving pieces to be connected with the main driving piece, the size of the ventilation channel at the ventilation opening can be flexibly adjusted, and the ventilation effect and applicability of the air door are improved.

Description

Technical Field

[0001] This utility model relates to the field of underground ventilation doors in coal mines, and in particular to an easily adjustable underground ventilation door for coal mines. Background Technology

[0002] In order to ensure ventilation inside coal mines, existing underground coal mines usually have double ventilation doors designed to meet the normal and orderly excavation and ventilation needs.

[0003] In actual use, traditional coal mine underground air doors have a fixed ventilation channel size, which cannot be flexibly adjusted according to different operation stages or changes in the working environment. This makes it impossible for workers to adjust the size of the ventilation channel according to actual ventilation needs, thus greatly reducing the ventilation effect and applicability of the air doors. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an easily adjustable underground ventilation door for coal mines. The technical solution of this utility model is as follows:

[0005] An easily adjustable underground ventilation door for coal mines includes two sets of ventilation doors installed inside a door frame. A square through-slot is formed on the surface of each ventilation door, and a square seat is fixedly connected inside the square through-slot. A ventilation opening is formed on the surface of the square seat. Two sets of baffles for closing or opening the ventilation opening are slidably connected to the front of each ventilation door. A drive unit for opening or closing the two sets of baffles is also connected to the front of the ventilation door. A mounting groove is formed on the rear side of the square seat, above the ventilation opening, and the rear side of the mounting groove is detachable. A back plate is detachably connected to the square base. A second mounting slot is provided on the rear side of the square base and above the first mounting slot. The back plate is detachably connected to the rear side of the second mounting slot. Multiple sets of wind deflectors are vertically rotatably connected inside the vent. Each set of wind deflectors is connected to a single drive unit at the upper end to drive the rotation of the set of wind deflectors. The single drive unit is located inside the first mounting slot. A main drive unit is installed inside the second mounting slot to drive some of the single drive units. Each set of single drive units is detachably connected to the main drive unit.

[0006] Optionally, vertical guide grooves are provided on both the left and right sides of the front surface of the damper, and guide strips are fixedly connected to both the left and right sides of the rear surface of the baffle, with the guide strips slidably connected inside the vertical guide grooves on the corresponding side.

[0007] Optionally, the drive component includes two sets of fixed ear plates, two sets of movable ear plates, and two sets of telescopic push rods. The two sets of fixed ear plates are respectively fixedly connected to the upper and lower ends of the front surface of the damper, the two sets of movable ear plates are respectively fixedly connected to the front surface of the two sets of wind deflectors, the fixed ends of the two sets of telescopic push rods are respectively fixedly connected to the two sets of fixed ear plates, and the telescopic ends of the two sets of telescopic push rods are respectively fixedly connected to the two sets of movable ear plates at corresponding positions.

[0008] Optionally, the lower surface of the mounting groove has multiple sets of equidistantly distributed circular holes, the lower ends of which are connected to the ventilation openings. The upper end of the wind deflector is fixedly connected to an upper rotating shaft, which rotates through the corresponding circular holes and extends into the mounting groove. The lower end of the wind deflector is fixedly connected to a lower rotating shaft, which is rotatably connected to the lower surface of the ventilation opening.

[0009] Optionally, four sets of slide rails are horizontally installed inside the first mounting slot, and the four sets of slide rails are symmetrically arranged in pairs. A movable slot is opened through the rear side of the lower surface of the second mounting slot, and the movable slot is connected to the first mounting slot. The single drive component includes a gear and a rack. The gear is fixedly sleeved on the outside of the upper rotating shaft. The two adjacent sets of gears are staggered vertically. The rack meshes with the rear side of the gear. Slider blocks are symmetrically fixed on the upper and lower sides of the rack. The sliders are slidably connected to the inside of the slide rails at corresponding positions. An inverted T-shaped plate is fixedly connected to the rear side of the rack. The inverted T-shaped plate is slidably connected to the inside of the movable slot. The upper end of the inverted T-shaped plate is located inside the second mounting slot.

[0010] Optionally, the upper left and right sides of the inverted T-shaped plate are symmetrically fixed with side ear plates, and the side ear plates are threaded with fixing bolts. The main driving component includes a movable plate and a telescopic push rod II. The movable plate is slidably connected to the lower inner surface of the mounting groove II. The side ear plates are detachably connected to the movable plate by fixing bolts. The fixed end of the telescopic push rod II is fixedly connected to the inner wall of the mounting groove II. A fixing seat is fixedly connected to the upper surface of the movable plate. The telescopic end of the telescopic push rod II is fixedly connected to the fixing seat.

[0011] Optionally, an L-shaped seat is fixedly connected to the upper rear side of the inverted T-shaped plate, and a limit bolt is threaded onto the L-shaped seat. The L-shaped seat is detachably connected to the mounting groove through the limit bolt.

[0012] All of the above optional technical solutions can be combined arbitrarily, and this utility model does not provide a detailed description of the structure after each combination.

[0013] The beneficial effects of this utility model through the above solution are as follows:

[0014] This invention, by setting a single drive component, can independently drive a single set of wind deflector blades to rotate. Based on actual ventilation needs, some single drive components can be flexibly connected to the main drive component, and then the main drive component drives these single drive components to operate, thereby achieving the rotation of these wind deflector blades. Single drive components not connected to the main drive component will not operate, and the wind deflector blades in that section will be in a closed state. By selecting an appropriate number of single drive components to connect to the main drive component, the size of the ventilation channel at the air vent can be flexibly adjusted, improving the ventilation effect and applicability of the damper. Furthermore, by setting two sets of wind deflectors, even when all the wind deflector blades are closed, both sets of wind deflectors can be closed again, thus achieving a secondary seal of the air vent and further enhancing the damper's airtightness.

[0015] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a front view of the ventilation opening in the closed state in this utility model;

[0017] Figure 2 This is a front view of the vent in the open state in this utility model;

[0018] Figure 3 This is a rear view of the windbreak door, square seat, and wind deflector blades of this utility model.

[0019] Figure 4 This is an exploded structural diagram of the wind door, wind baffle, drive component 1, and square base of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the windbreak plate in this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the square base, windshield blade, single drive component and main drive component in this utility model;

[0022] Figure 7 This is an exploded structural diagram of the square base, windshield blade, single drive component, and overall drive component in this utility model.

[0023] Figure 8 for Figure 7 Enlarged structural diagram at point A;

[0024] Figure 9 This is a right-side cross-sectional view of the square base, single drive component, and main drive component in this utility model.

[0025] Figure 10 This is a schematic diagram of the structure of the windshield blade, single drive component and main drive component in this utility model;

[0026] Figure 11 This is an exploded structural diagram of the windshield blade, single drive component, and main drive component in this utility model;

[0027] Figure 12 This is a schematic diagram of the structure of the rack, inverted T-shaped plate, L-shaped seat and side ear plate in this utility model.

[0028] Numbered in the diagram: 1. Damper frame; 2. Damper; 21. Square through groove; 22. Vertical guide groove; 3. Baffle plate; 31. Guide strip; 32. Sealing strip one; 33. Sealing strip two; 4. Drive component one; 41. Fixed ear plate; 42. Movable ear plate; 43. Telescopic push rod one; 5. Square seat; 51. Ventilation opening; 52. Mounting groove one; 521. Round hole; 522. Slide rail; 523. Back plate one; 53. Mounting groove two; 531. Movable groove; 53 2. Limiting hole; 533. Slide groove; 534. Back plate II; 6. Wind deflector blade; 61. Upper rotating shaft; 62. Lower rotating shaft; 7. Single drive component; 71. Gear; 72. Rack; 721. Slider; 73. Inverted T-shaped plate; 74. L-shaped seat; 741. Limiting bolt; 75. Side ear plate; 751. Fixing bolt; 8. Main drive component; 81. Movable plate; 811. Fixing hole; 812. Slide bar; 82. Telescopic push rod II; 83. Fixing seat. Detailed Implementation

[0029] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0030] Please see Figure 1-12This utility model provides an easily adjustable underground ventilation door for coal mines, including two sets of ventilation doors 2 installed inside the ventilation door frame 1. A square through-slot 21 is formed on the surface of each ventilation door 2. A square seat 5 is fixedly connected inside the square through-slot 21. A ventilation opening 51 is formed on the surface of the square seat 5. Two sets of baffles 3 for closing or opening the ventilation opening 51 are slidably connected to the front of each ventilation door 2. A drive component 4 for opening or closing the two sets of baffles 3 is also connected to the front of each ventilation door 2. A mounting groove 52 is formed on the rear side of the square seat 5, above the ventilation opening 51. A back plate 523 is detachably connected to the side. A second mounting slot 53 is provided on the rear side of the square base 5 and above the first mounting slot 52. A second back plate 534 is detachably connected to the rear side of the second mounting slot 53. Multiple sets of wind deflectors 6 are vertically rotatably connected inside the vent 51. Each set of wind deflectors 6 has a single drive unit 7 connected to its upper end for driving the rotation of the set of wind deflectors 6. The single drive unit 7 is located inside the first mounting slot 52. A main drive unit 8 for driving some of the single drive units 7 is installed inside the second mounting slot 53. Each set of single drive units 7 is detachably connected to the main drive unit 8.

[0031] Specifically, a single drive unit 7 drives a group of wind deflector blades 6 to rotate. When multiple groups of wind deflector blades 6 rotate to the same straight line, the ventilation channel where the multiple groups of wind deflector blades 6 are located is closed. When multiple groups of wind deflector blades 6 rotate to a parallel state (i.e., rotate 90 degrees from the closed state), the ventilation channel where the multiple groups of wind deflector blades 6 are located is opened. The operator can connect some of the single drive units 7 to the main drive unit 8 according to the ventilation needs. At this time, the main drive unit 8 can drive the connected single drive units 7 to operate, thereby realizing the rotation operation of that part of the wind deflector blades 6, and thus achieving the purpose of adjusting the size of the ventilation channel. In specific operation, when it is necessary to increase the size of the ventilation channel of the vent 51, all or most of the single drive units 7 can be connected to the main drive unit 8. At this time, these single drive units 7 will work together to drive the wind deflector blades 6 to rotate and open the ventilation channel. When it is necessary to decrease the size of the ventilation channel of the vent 51, a small number of single drive units 7 can be connected to the main drive unit 8. At this time, the single drive unit 7, which is not connected to the main drive unit 8, will not operate. As a result, some of the wind deflector blades 6 will be in a closed state, reducing the ventilation volume and thus enabling flexible adjustment of the ventilation channel.

[0032] Specifically, when it is necessary to close the ventilation channel of the vent 51, all the wind deflectors 6 are adjusted to the closed state. After the adjustment is completed, the two sets of wind deflectors 3 are closed again by the drive component 4, thereby achieving a secondary closure of the vent 51.

[0033] Specifically, the back plate 523 on the rear side of mounting slot 52 is fixed to the square base 5 with bolts, allowing for quick disassembly and assembly when it is necessary to maintain the components inside mounting slot 52. The back plate 534 on the rear side of mounting slot 53 is also fixed to the square base 5 with bolts, allowing for quick disassembly and assembly when it is necessary to adjust the connection between the single drive component 7 and the main drive component 8 or to maintain the components inside mounting slot 53.

[0034] Furthermore, vertical guide grooves 22 are provided on both the left and right sides of the front surface of the damper 2, and guide strips 31 are fixedly connected to both the left and right sides of the rear surface of the baffle 3. The guide strips 31 are slidably connected inside the vertical guide grooves 22 on the corresponding side. Sealing strip 1 32 is glued to the side of the two sets of baffles 3 that are close to each other, and sealing strip 2 33 is glued to the left and right sides of the back of the two sets of baffles 3 and the side of the back of the two sets of baffles 3 that are far apart.

[0035] Specifically, when the driving component 4 drives the two sets of wind deflectors 3 to open or close, the wind deflectors 3 drive the guide strip 31 to slide within the vertical guide groove 22. The vertical guide groove 22 guides and limits the wind deflectors 3, ensuring that the wind deflectors 3 can slide along a predetermined path. When the two sets of wind deflectors 3 are fully closed, the sealing strip 32 effectively seals the gap between the two sets of wind deflectors 3. The sealing strip 33 enhances the sealing between the wind deflectors 3 and the damper 2.

[0036] Furthermore, the drive component 4 includes two sets of fixed ear plates 41, two sets of movable ear plates 42, and two sets of telescopic push rods 43. The two sets of fixed ear plates 41 are respectively fixedly connected to the upper and lower ends of the front surface of the damper 2, the two sets of movable ear plates 42 are respectively fixedly connected to the front surfaces of the two sets of wind deflectors 3, the fixed ends of the two sets of telescopic push rods 43 are respectively fixedly connected to the two sets of fixed ear plates 41, and the telescopic ends of the two sets of telescopic push rods 43 are respectively fixedly connected to the two sets of movable ear plates 42 at corresponding positions.

[0037] Specifically, when it is necessary to drive the two sets of wind deflectors 3 to open, the telescopic ends of the two sets of telescopic push rods 43 retract, and the telescopic ends drive the wind deflectors 3 to open through the movable ear plate 42.

[0038] Furthermore, multiple sets of equidistant circular holes 521 are provided through the lower surface of the mounting groove 52. The lower ends of the circular holes 521 are connected to the vents 51. An upper rotating shaft 61 is fixedly connected to the upper end of the wind deflector 6. The upper rotating shaft 61 rotates through the corresponding circular holes 521 and extends into the interior of the mounting groove 52. A lower rotating shaft 62 is fixedly connected to the lower end of the wind deflector 6. The lower rotating shaft 62 is rotatably connected to the lower surface of the vents 51.

[0039] Specifically, when the single drive unit 7 drives the set of wind deflector blades 6 to rotate, the wind deflector blades 6 drive the upper rotating shaft 61 at the upper end to rotate in the corresponding circular hole 521.

[0040] Furthermore, four sets of slide rails 522 are horizontally installed inside the first mounting slot 52. The four sets of slide rails 522 are symmetrically arranged in pairs. A movable slot 531 is opened through the rear side of the lower surface of the second mounting slot 53. The movable slot 531 is connected to the first mounting slot 52. The single drive component 7 includes a gear 71 and a rack 72. The gear 71 is fixedly sleeved on the outside of the upper rotating shaft 61. The two adjacent sets of gears 71 are staggered vertically. The rack 72 meshes with the rear side of the gear 71. Slider blocks 721 are symmetrically fixed on the upper and lower sides of the rack 72. The sliders 721 are slidably connected to the inside of the slide rails 522 at the corresponding positions. An inverted T-shaped plate 73 is fixedly connected to the rear side of the rack 72. The inverted T-shaped plate 73 is slidably connected to the inside of the movable slot 531. The upper end of the inverted T-shaped plate 73 is located inside the second mounting slot 53.

[0041] Specifically, the main drive unit 8 drives the inverted T-shaped plate 73 to move laterally. The inverted T-shaped plate 73 drives the rack 72 to move synchronously, thereby driving the gear 71 meshing with it to rotate. The gear 71 then drives the windshield blade 6 to rotate via the upper rotating shaft 61, thus realizing the rotation adjustment of the windshield blade 6. When the inverted T-shaped plate 73 drives the rack 72 to move laterally, the rack 72 drives the slider 721 to slide within the corresponding slide rail 522. The slide rail 522 guides and limits the slider 721, ensuring that the rack 72 slides along the predetermined path. In addition, when one of the two adjacent sets of single drive units 7 is not connected to the main drive unit 8, when the main drive unit 8 drives the other set of single drive units 7 connected to it to operate, the inverted T-shaped plate 73 drives the rack 72 to move laterally. At this time, the inverted T-shaped plate 73 and rack 72 in the single drive unit 7 not connected to the main drive unit 8 will remain in their original positions. By setting the two adjacent sets of gears 71 to a staggered distribution, the two adjacent sets of racks 72 are also staggered. At this time, if one set of racks 72 moves while the other set of racks 72 does not move, there will be no motion interference to the moving rack 72.

[0042] Furthermore, side ear plates 75 are symmetrically fixed on the left and right sides of the upper end of the inverted T-shaped plate 73. The side ear plates 75 are threaded with fixing bolts 751. The main drive component 8 includes a movable plate 81 and a telescopic push rod 82. The movable plate 81 is slidably connected to the lower inner surface of the mounting groove 53. The side ear plates 75 are detachably connected to the movable plate 81 by fixing bolts 751. The fixed end of the telescopic push rod 82 is fixedly connected to the inner wall of the mounting groove 53. A fixing seat 83 is fixedly connected to the upper surface of the movable plate 81. The telescopic end of the telescopic push rod 82 is fixedly connected to the fixing seat 83.

[0043] Specifically, the main drive unit 8 achieves the lateral movement of the movable plate 81 through the telescopic movement of the telescopic push rod 82. When it is necessary to connect the single drive unit 7 to the main drive unit 8, it is only necessary to fix the two sets of side ear plates 75 in the single drive unit 7 to the movable plate 81 with fixing bolts 751. Specifically, multiple sets of fixing holes 811 are opened on the rear side of the movable plate 81. When it is necessary to fix the side ear plate 75 to the movable plate 81, it is only necessary to thread the fixing bolt 751 through the side ear plate 75 and let its end abut against the fixing hole 811. Subsequently, when the telescopic push rod 82 drives the movable plate 81 to move laterally, it will drive the side ear plate 75 and the inverted T-shaped plate 73 to move synchronously. In addition, a sliding groove 533 is opened on the front side of the lower surface of the mounting groove 53, and a sliding strip 812 that cooperates with the sliding groove 533 is fixedly connected to the lower surface of the movable plate 81.

[0044] Furthermore, an L-shaped seat 74 is fixedly connected to the upper rear side of the inverted T-shaped plate 73. A limit bolt 741 is threaded onto the L-shaped seat 74, and the L-shaped seat 74 forms a detachable connection with the mounting groove 53 through the limit bolt 741.

[0045] Specifically, when the wind deflector blades 6 belonging to a portion of the single drive unit 7 are in the closed state and do not need to be opened according to ventilation requirements, this portion of the single drive unit 7 not connected to the main drive unit 8 can be fixed to the square base 5. Specifically, multiple sets of limiting holes 532 are equidistantly provided on the lower surface of the mounting groove 2 53 and on the rear side of the movable groove 531. When it is necessary to fix the inverted T-shaped plate 73 to the square base 5, simply pass the limiting bolt 741 through the L-shaped base 74 so that its end abuts against the limiting hole 532 at the corresponding position. At this time, the L-shaped base 74 and the square base 5 are relatively fixed, so that the inverted T-shaped plate 73 cannot move laterally, thereby locking the rotation direction of the set of wind deflector blades 6 and preventing them from opening on their own due to external force or vibration.

[0046] Working principle: First, the operator selects the wind deflector blades 6 that need to be opened according to the actual ventilation requirements and connects their respective single drive components 7 to the main drive component 8. Specifically, the side ear plates 75 of the single drive components 7 to be connected are fixed to the movable plate 81 using fixing bolts 751. Second, the operator uses limiting bolts 741 to fix the L-shaped seats 74 of the remaining wind deflector blades 6 to the mounting slots 53 in the square seats 5. Third, when ventilation is required at the vent 51, the operator first retracts the telescopic push rod 43, thereby moving the two sets of wind deflector blades 3 upwards and downwards respectively. Next, the telescopic push rod 2 82 is retracted, causing the movable plate 81 to move to the left. During this process, the movable plate 81 drives multiple sets of connected inverted T-shaped plates 73 and racks 72 to move to the left simultaneously, thereby causing the corresponding gears 71 to rotate counterclockwise. The gears 71 then drive the wind deflector blades 6 to rotate counterclockwise via the upper rotating shaft 61 until the wind deflector blades 6 rotate 90 degrees, opening the ventilation channel to which that part of the wind deflector blades 6 belongs. Fourth, when it is necessary to close the ventilation opening 51, the operator first extends the telescopic push rod 2 82, causing the movable plate 81 to move to the right. During this process, the movable plate 81 indirectly drives multiple sets of connected wind deflector blades 6 to rotate clockwise, thus resetting the opened wind deflector blades 6 to the closed state. Next, the telescopic push rod 1 43 is extended, causing the two sets of wind deflector plates 3 to move to the middle position, thus closing the ventilation opening 51 a second time. This completes the adjustment of the ventilation channel size of the ventilation opening 51 and the opening and closing of the ventilation channel.

[0047] It should be noted that: 1. The telescopic push rod 43 and telescopic push rod 82 mentioned above can be replaced with electric push rods, hydraulic cylinders, or pneumatic cylinders, etc., to achieve the telescopic function, depending on the specific application requirements. 2. The hinge structure between the damper frame 1 and the damper 2, as well as the opening structure of the damper 2, are existing technologies and will not be described in detail here.

[0048] The above are merely preferred embodiments of this utility model and are not intended to limit this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A conveniently adjustable coal mine underground air door characterised in that: The utility model provides an air door, including two groups of air door (2) installed in the inside of air door frame (1), the surface of air door (2) is equipped with square through slot (21) through, the inside of square through slot (21) is fixedly connected with square seat (5), the surface of square seat (5) is equipped with air vent (51) through, the front side of air door (2) is connected with two groups of baffle (3) for closing or opening air vent (51) and slide, the front side of air door (2) is still connected with the drive piece one (4) for driving two groups of baffle (3) to open or close, the rear side of square seat (5) and be located above air vent (51) and be equipped with installation groove one (52), the rear side of installation groove one (52) is detachably connected with backboard one (523), the rear side of square seat (5) and be located above installation groove one (52) and be equipped with installation groove two (53), the rear side of installation groove two (53) is detachably connected with backboard two (534), the inside of air vent (51) is vertically rotatably connected with a plurality of baffle blade (6), and the upper end of every group baffle blade (6) is connected with single drive piece (7) for driving the group baffle blade (6) rotation, single drive piece (7) is located in the inside of installation groove one (52), and the inside of installation groove two (53) is installed with total drive piece (8) for driving partial single drive piece (7) operation, and every group single drive piece (7) is detachably connected between total drive piece (8).

2. A conveniently adjustable coal mine underground air door according to claim 1, characterized in that, The front surface of air door (2) is equipped with vertical guide slot (22) on both sides, and the rear surface of baffle (3) is fixedly connected with guide strip (31) on both sides.

3. A conveniently adjustable coal mine underground air door according to claim 1 or 2, characterized in that, The drive piece one (4) includes two groups of fixed lug (41), two groups of movable lug (42) and two groups of telescopic push rod one (43), two groups of fixed lug (41) are fixedly connected on the upper and lower ends of the front surface of air door (2) respectively, two groups of movable lug (42) are fixedly connected on the front surfaces of two groups of baffle (3) respectively, the fixed ends of two groups of telescopic push rod one (43) are fixedly connected with two groups of fixed lug (41) respectively, and the telescopic ends of two groups of telescopic push rod one (43) are fixedly connected with two groups of movable lug (42) at corresponding positions respectively.

4. A conveniently adjustable coal mine underground air door according to claim 1, characterized in that, The lower surface of installation groove one (52) is equipped with a plurality of equidistantly distributed circular holes (521) through, the lower end of circular hole (521) is communicated with air vent (51), the upper end of baffle blade (6) is fixedly connected with upper rotating shaft (61), the upper rotating shaft (61) is rotatably through corresponding position circular hole (521) and extends to the inside of installation groove one (52), the lower end of baffle blade (6) is fixedly connected with lower rotating shaft (62), and the lower rotating shaft (62) is rotatably connected with the lower surface of air vent (51).

5. A conveniently adjustable coal mine underground air door according to claim 4, characterised in that, The inside of the installation groove one (52) is transversely provided with four groups of slide rails (522), the four groups of slide rails (522) are symmetrically arranged two by two respectively, the lower surface of the installation groove two (53) is provided with a movable groove (531) penetratingly arranged at the rear side, the movable groove (531) is communicated with the installation groove one (52), the single driving part (7) comprises a gear (71) and a rack (72), the gear (71) is fixedly sleeved outside the upper rotating shaft (61), the left and right two groups of gears (71) are arranged in a staggered manner, the rack (72) is engaged at the rear side of the gear (71), the upper and lower sides of the rack (72) are symmetrically provided with a sliding block (721), the sliding block (721) is slidingly connected in the inside of the corresponding slide rail (522), the rear side of the rack (72) is fixedly connected with a reverse T-shaped plate (73), the reverse T-shaped plate (73) is slidingly connected in the inside of the movable groove (531), and the upper end of the reverse T-shaped plate (73) is located in the inside of the installation groove two (53).

6. A conveniently adjustable coal mine pit fan door according to claim 5, characterised in that, The upper end of the reverse T-shaped plate (73) is symmetrically provided with a side lug plate (75) on the left and right sides, the side lug plate (75) is screw-connected with a fixing bolt (751), the total driving part (8) comprises a movable plate (81) and a second telescopic push rod (82), the movable plate (81) is slidingly connected in the inside of the lower surface of the installation groove two (53), the side lug plate (75) is detachably connected with the movable plate (81) through the fixing bolt (751), and the fixed end of the second telescopic push rod (82) is fixedly connected with the inner wall of the installation groove two (53). The upper surface of the movable plate (81) is fixedly connected with a fixing seat (83), and the telescopic end of the second telescopic push rod (82) is fixedly connected with the fixing seat (83).

7. A conveniently adjustable coal mine pit fan door according to claim 6, characterised in that, The rear side of the upper end of the reverse T-shaped plate (73) is fixedly connected with an L-shaped seat (74), the L-shaped seat (74) is screw-connected with a limiting bolt (741), and the L-shaped seat (74) is detachably connected with the installation groove two (53) through the limiting bolt (741).

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