Coal mine tunnel air door protection device

Abstract

The utility model provides a coal mine tunnel air door protection device which comprises a door frame and a door body assembly, the door frame is installed in a tunnel and connected with the wall face of the tunnel, the door body assembly comprises a first door body and a second door body, the first door body is connected with the door frame, and the second door body is connected with the door frame. The first door body can rotate between a first position and a second position in the first circumferential direction, the second door body is connected with the first door body, the door bodies can move between a third position and a fourth position in the width direction of the first door body, and when the first door body is located at the first position and the second door body is located at the third position, the door body assembly blocks a roadway so as to block the roadway. When the first door body is located at the first position and the door body is located at the fourth position, the door body assembly blocks part of the roadway so that the roadway can be partially conducted, and when the first door body is located at the second position and the second door body is located at the fourth position, the roadway can be completely conducted. The coal mine tunnel air door protection device has the advantages of being convenient to open and close and small in occupied space.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel air doors, and in particular to a coal mine tunnel air door protection device. Background Art

[0002] The damper is an important infrastructure for mine ventilation, responsible for stabilizing the mine ventilation system, controlling wind short circuits, and ensuring the effective air volume of each wind used in the production system. In different working environments and conditions, the requirements for the wind resistance of the damper are also different. The wind speed that the mine tunnel damper can generally withstand is usually around 5 to 15 m / s.

[0003] In the related art, tunnel dampers are generally opened and closed by opposite opening and closing, mobile opening and closing, etc. When the opposite opening and closing method is adopted, it is necessary to increase the output power of the driving equipment to cope with the situation of higher wind speed. Long-term use may easily lead to frequent equipment maintenance, which is not conducive to daily production. The mobile opening and closing method causes the damper to occupy too much space in the tunnel, resulting in too little remaining ventilation space in the tunnel. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the utility model provides a coal mine tunnel air door protection device, which is easy to open and close and occupies less space.

[0005] The coal mine tunnel air door protection device of the utility model embodiment comprises:

[0006] A door frame, the door frame being installed in the lane and connected to a wall surface of the lane;

[0007] A door body assembly, the door body assembly comprising a first door body and a second door body, the first door body is connected to the door frame, the first door body is rotatable around a first circumferential direction between a first position and a second position,

[0008] The second door body is connected to the first door body, and the door body is movable between a third position and a fourth position along a width direction of the first door body.

[0009] The first door body is in the first position and the second door body is in the third position, and the door body assembly blocks the lane to block the lane.

[0010] The first door body is in the first position and the door body is in the fourth position, and the door body assembly blocks part of the lane to make the lane partially conductive.

[0011] The first door body is in the second position and the second door body is in the fourth position, so that the lane is fully open.

[0012] The first door body and the second door body of the coal mine tunnel wind door protection device of the utility model embodiment adopt different opening and closing methods. During the rotation opening and closing process of the first door body, since the second door body overlaps with the first door body, the wind resistance borne by the first door body during the rotation process is greatly reduced. In addition, when the first door body is closed, the second door body adopts a translational opening and closing method, which can also reduce the influence of wind resistance on the second door body, thereby facilitating the closing of the second door body.

[0013] Therefore, the coal mine tunnel air door protection device of the utility model embodiment is convenient to open and close and occupies less space.

[0014] In some embodiments, the coal mine tunnel air door protection device of the utility model embodiment further includes a first driving member and a second driving member, wherein the first driving member is connected to the first door body to drive the first door body to rotate around a first axial direction.

[0015] The second driving member includes a driving body and a driving part, the driving body is connected to the first door body, the driving part connects the driving body and the second door body, and the second driving member is used to drive the second door body to move along the width direction of the first door body.

[0016] In some embodiments, the coal mine tunnel air gate protection device of the utility model embodiment also includes a driving assembly, the driving assembly includes a first driving part and a second driving part, the first driving part is connected to the first door body, the second driving part includes a fixed component and a movable component, the fixed component is connected to the first door body, the movable component connects the fixed component and the second door body, the movable component moves from the third position to the fourth position, and at least a part of the movable component is connected to the first driving part for driving the first door body to rotate around the first axis.

[0017] In some embodiments, the first door body has a mounting groove, the opening of the mounting groove is located at an end of the first door body away from the first axial direction, and at least a portion of the second door body is placed in the mounting groove.

[0018] In some embodiments, the coal mine tunnel air gate protection device of the utility model embodiment also includes a buffer assembly, the buffer assembly includes a buffer part, the buffer part is connected to the door frame, and the buffer part and the first door body are arranged at intervals in the width direction of the tunnel, the buffer part has a buffer groove, the notch of the buffer groove is arranged toward the first door body, the second door body is in the third position, and the end of the second door body away from the first door body is placed in the buffer groove.

[0019] In some embodiments, the buffer assembly further includes a buffer protrusion, the buffer protrusion is connected to the bottom wall of the buffer groove, and an extension direction of the buffer protrusion is consistent with an extension direction of the buffer groove.

[0020] In some embodiments, the buffer assembly also includes a blocking member, which is connected to the side wall of the buffer groove. There are multiple blocking members, and the multiple blocking members are divided into multiple blocking member groups. The multiple blocking member groups are arranged at intervals along the length direction of the buffer groove. One blocking member group includes two blocking members. The blocking members in one blocking member group are relatively arranged along the thickness direction of the second door body. The blocking members are movable along the thickness direction of the second door body, and the blocking members are against the second door body.

[0021] In some embodiments, the blocking member includes a blocking portion, a blocking body and an elastic member, one end of the blocking body is connected to the side wall of the buffer groove, the blocking portion is connected to the other end of the blocking body, the middle part of the blocking body has a protrusion, and the elastic member is connected between the protrusion and the side wall of the buffer groove.

[0022] In some embodiments, in one blocking member set, a distance between two blocking members is smaller than a thickness of the second door body.

[0023] In some embodiments, the plurality of blocking components are divided into a first blocking component and a second blocking component, the second blocking component is located on a side of the first blocking component away from the first door body, and the distance between the two blocking components in the first blocking component is greater than the distance between the two blocking components in the second blocking component. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a coal mine tunnel air door protection device according to an embodiment of the utility model (the first door body is located at the first position, and the second door body is located at the third position).

[0025] Figure 2 It is a structural schematic diagram of a coal mine tunnel air door protection device according to an embodiment of the utility model (the first door body is located at the first position, and the second door body is located at the fourth position).

[0026] Figure 3 It is a structural schematic diagram of a coal mine tunnel air door protection device according to an embodiment of the utility model (the first door body is located at the second position, and the second door body is located at the fourth position).

[0027] Figure 4 It is a structural schematic diagram of a driving assembly and a door body assembly of a coal mine tunnel air door protection device in another embodiment of the utility model.

[0028] Figure 5It is a schematic cross-sectional structural diagram of a buffer component of a coal mine tunnel air door protection device according to an embodiment of the utility model.

[0029] Figure 6 It is a schematic cross-sectional structural diagram of a buffer component of a coal mine tunnel air door protection device in an optional embodiment of the utility model.

[0030] Reference numerals:

[0031] 1. Door frame,

[0032] 2. Door body assembly, 21. First door body, 211. Mounting groove, 22. Second door body,

[0033] 31. a first driving member, 32. a second driving member,

[0034] 4. driving assembly, 41. first driving unit, 42. second driving unit, 421. fixed component, 422. moving component,

[0035] 5. Buffer assembly, 51. Buffer member, 511. Buffer groove, 52. Buffer protrusion, 53. Blocking member, 531. Blocking portion, 532. Blocking body, 5321. Protrusion, 533. Elastic member, 54. First blocking assembly, 55. Second blocking assembly. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0037] like Figure 1-Figure 6 As shown, the coal mine tunnel air door protection device of the embodiment of the utility model includes: a door frame 1 and a door body assembly 2.

[0038] The door frame 1 is installed in the lane and connected to the wall of the lane. The door body assembly 2 includes a first door body 21 and a second door body 22. The first door body 21 is connected to the door frame 1 and can rotate between a first position and a second position around a first circumferential direction. The second door body 22 is connected to the first door body 21 and the door bodies are arranged along the width direction of the first door body 21 (such as Figure 1 The first door body 21 is in the first position and the second door body 22 is in the third position, and the door body assembly 2 blocks the alley to block the alley. The first door body 21 is in the first position and the door body is in the fourth position, and the door body assembly 2 blocks part of the alley to make the alley partially conductive. The first door body 21 is in the second position and the second door body 22 is in the fourth position to make the alley fully conductive.

[0039] Specifically, Figure 1-Figure 3As shown, the outer peripheral wall of the door frame 1 can be fixedly connected to the wall surface of the lane by bolts. The first door body 21 is connected to the door frame 1 through a rotating shaft so that the first door frame 1 rotates around the rotating shaft, wherein the axial direction of the rotating shaft is the first axial direction. The second door body 22 can move relative to the first door body 21 in the left and right direction to realize the functions of opening and closing and blocking the lane.

[0040] It is understandable that if Figure 1 As shown, the first door body 21 is located at the first position, and the second door body 22 is located at the third position. At this time, the door body assembly 2 completely blocks the lane; Figure 2 As shown, the first door body 21 is located at the first position, and the second door body 22 is located at the fourth position. At this time, the door body assembly 2 blocks part of the lane; Figure 3 As shown, the first door body 21 is located at the second position, and the second door body 22 is located at the fourth position. At this time, the door body assembly 2 is in a fully open state, so that the lane is not blocked by the door body assembly 2.

[0041] That is, by adjusting the second damper to move between the third position and the fourth position, the damper assembly switches between a semi-blocked state and a fully blocked state for the lane, and by adjusting the first damper and the second damper at the same time, the damper assembly switches between a semi-blocked state and a non-blocked state for the lane.

[0042] In addition, when the first damper rotates from the second position to the first position, since the second damper overlaps with the first damper, part of the lane can still have air flow, which prevents the alley wind force from acting on the first damper, thereby reducing the operating load of the equipment driving the first door body 21. When the first door body 21 rotates to the first position, the second damper is controlled to move from the fourth position to the third position. Since the second door body 22 is a horizontal movement, the force between the second door body 22 and the first door body 21 can reduce the resistance of the driving equipment of the second damper to the lane wind force, thereby reducing the operating load of the equipment driving the second door body 22.

[0043] In other words, the first door body 21 and the second door body 22 of the coal mine tunnel air door protection device of the embodiment of the utility model adopt different opening and closing methods. During the rotation opening and closing process of the first door body 21, since the second door body 22 overlaps with the first door body 21, the wind resistance borne by the first door body 21 during the rotation process is greatly reduced. In addition, when the first door body 21 is closed, the second door body 22 adopts a translational opening and closing method, which can also reduce the influence of wind resistance on the second door body 22, thereby facilitating the closing of the second door body 22.

[0044] Therefore, the coal mine tunnel air door protection device of the utility model embodiment is convenient to open and close and occupies less space.

[0045] In some embodiments, the coal mine tunnel air gate protection device of the utility model embodiment also includes a first driving member 31 and a second driving member 32. The first driving member 31 is connected to the first door body 21 to drive the first door body 21 to rotate around the first axis. The second driving member 32 includes a driving body and a driving part. The driving body is connected to the first door body 21, and the driving part connects the driving body and the second door body 22. The second driving member 32 is used to drive the second door body 22 to move along the width direction of the first door body 21.

[0046] It is understandable that if Figure 1-Figure 3 As shown, the first driving member 31 can be a transmission device composed of a motor, a transmission gear, etc., and a gear meshing with the transmission gear is installed on the rotating shaft of the first door body 21, so that the starting motor can drive the gear transmission on the rotating shaft through the transmission gear, thereby driving the first door body 21 to rotate around the rotating shaft. The second driving member 32 can be a device with a linear reciprocating function such as a linear module, and the driving body is a linear guide rail, and the driving part is a slider.

[0047] In other embodiments, the coal mine tunnel air gate protection device of the utility model embodiment also includes a drive assembly 4, the drive assembly 4 includes a first drive part 41 and a second drive part 42, the first drive part 41 is connected to the first door body 21, the second drive part 42 includes a fixed component 421 and a movable component 422, the fixed component 421 is connected to the first door body 21, the movable component 422 connects the fixed component 421 and the second door body 22, the movable component 422 moves from the fourth position to the third position, and at least a portion of the movable component 422 is connected to the first drive part 41 for driving the first door body 21 to rotate around the first axis.

[0048] Specifically, Figure 4 As shown, the first driving part 41 can be a gear, which is welded to the rotating shaft of the first door body 21, and the rotation of the gear can drive the rotating shaft and the first door body 21 to rotate. The second driving part 42 is a device with a linear reciprocating function such as a linear module, and the fixed component 421 is a linear guide rail and is fixedly connected to the first door body 21. The moving component 422 can be a slider that can slide along the linear guide rail. In addition, a rack matching the gear is connected to one end of the moving component 422 adjacent to the first driving part 41. When the moving component 422 moves from right to left, it first drives the second door body 22 to move to the left until the gear rack is engaged. The moving component 422 continues to move toward the first driving part 41, and the gear is rotated by the engagement of the gear rack, thereby driving the rotating shaft and the first door body 21 to rotate.

[0049] In some embodiments, the first door body 21 has a mounting groove 211 , the opening of the mounting groove 211 is located at an end of the first door body 21 away from the first axial direction, and at least a portion of the second door body 22 is disposed in the mounting groove 211 .

[0050] Specifically, Figure 1 and Figure 5 As shown, the extension direction of the installation groove 211 is consistent with the left-right direction, and a avoidance opening is opened on the top of the first door body 21, which is connected to the installation groove 211, so that part of the movable part passes through the avoidance opening and is connected to the second door body 22.

[0051] It can be understood that the left end of the second door body 22 is placed in the mounting groove 211, and when the second door body 22 is in the fourth position, part of the second door body 22 can be placed in the mounting groove 211, thereby ensuring that the alley is in a semi-blocked state, and part of the second door body 22 is hidden in the mounting groove 211 of the first door body 21, which can also reduce space occupancy.

[0052] In some embodiments, the coal mine tunnel air gate protection device of the utility model embodiment also includes a buffer assembly 5, the buffer assembly 5 includes a buffer member 51, the buffer member 51 is connected to the door frame 1, and the buffer member 51 and the first door body 21 are arranged at intervals in the width direction of the tunnel, the buffer member 51 has a buffer groove 511, the notch of the buffer groove 511 is arranged toward the first door body 21, the second door body 22 is in the third position, and the end of the second door body 22 away from the first door body 21 is placed in the buffer groove 511.

[0053] It is understandable that if Figure 1 and Figure 5 As shown, the second door body 22 moves from the fourth position to the third position. When it is adjacent to the right door frame 1, since the second door body 22 is longer than the first door body 21, the second door body 22 is easily affected by the wind speed in the alley, which increases the resistance encountered by the second door body 22. Therefore, a buffer member 51 is provided on the right side of the door frame 1 so that the right end of the second door body 22 is placed in the buffer groove 511, which can ensure that the resistance of the second door body 22 is reduced when it moves to the third position adjacent to the right side.

[0054] In some embodiments, the buffer assembly 5 further includes a buffer protrusion 52 , the buffer protrusion 52 is connected to the bottom wall of the buffer groove 511 , and an extending direction of the buffer protrusion 52 is consistent with an extending direction of the buffer groove 511 .

[0055] It is understandable that if Figure 5 As shown, the extending direction of the buffer protrusion 52 is consistent with the up-down direction, and the buffer protrusion 52 can be made of rubber material, so that when the second door body 22 contacts the buffer protrusion 52, the impact force of the second door body 22 is reduced, thereby reducing the possibility of collision and deformation of the second door body 22. Preferably, there are multiple buffer protrusions 52, and the multiple buffer protrusions 52 are arranged at intervals along the width direction of the buffer groove 511.

[0056] In some embodiments, the buffer assembly 5 further includes a blocking member 53, the blocking member 53 is connected to the side wall of the buffer groove 511, and there are multiple blocking members 53, and the multiple blocking members 53 are divided into multiple blocking member 53 groups, and the multiple blocking member 53 groups are arranged along the length direction of the buffer groove 511 (such as Figure 1 The blocking members 53 are arranged at intervals in the up and down directions of the second door body 22, one blocking member 53 group includes two blocking members 53, and the blocking members 53 in one blocking member 53 group are relatively arranged along the thickness direction of the second door body 22, and the blocking members 53 are movable along the thickness direction of the second door body 22, and the blocking members 53 are against the second door body 22.

[0057] Specifically, Figure 5 and Figure 6 As shown, two blocking members 53 in a blocking member group 53 are arranged on both sides of the second door body 22 along the front-to-back direction. When the right end of the second door body 22 is placed in the buffer groove 511 and gradually moves to the right, due to the arrangement of the blocking members 53, the second door body 22 is against the top of the blocking member 53 before reaching the third position, thereby applying a certain resistance to the second door body 22 and also ensuring the moving trajectory of the second door body 22, thereby reducing the possibility of deformation of the second door body 22.

[0058] In some embodiments, the blocking member 53 includes a blocking portion 531, a blocking body 532 and an elastic member 533, one end of the blocking body 532 is connected to the side wall of the buffer groove 511, the blocking portion 531 is connected to the other end of the blocking body 532, the middle part of the blocking body 532 has a protrusion 5321, and the elastic member 533 is connected between the protrusion 5321 and the side wall of the buffer groove 511.

[0059] Specifically, Figure 5 and Figure 6 As shown, the blocking body 532 is arranged in the front-to-back direction, and one end of the blocking body 532 adjacent to the buffer member 51 passes through the side wall of the buffer groove 511. The elastic member 533 may be a spring, which is mounted on the blocking body 532, and is placed between the protrusion 5321 and the side wall of the buffer groove 511, so that the blocking body 532 can move in the front-to-back direction. The blocking part 531 may be a rotating wheel made of rubber material, and the blocking part 531 is connected to the blocking body 532 through a rotating shaft.

[0060] It can be understood that when the right end of the second door body 22 is placed in the buffer groove 511 and continues to move to the right, the second door body 22 is abutted against the blocking portion 531, and under the action of the elastic member 533, it is ensured that the blocking portion 531 can always be in contact with the side wall of the second door body 22. While the blocking member 53 provides a certain resistance to the second door body 22, it also avoids a rigid collision with the second door body 22, thereby ensuring the safety of the second door body 22 during movement.

[0061] Preferably, if Figure 6 As shown, in one blocking member group 53, the distance between the two blocking members 53 is less than the thickness of the second door body 22. It can be understood that, since the blocking portion 531 is a rotatable rotating wheel, the distance a between the front and rear blocking members 53 is less than the thickness of the second door body 22, which ensures that the second door body 22 continues to move rightward after contacting the blocking member 53, and the blocking member 53 can always abut against the side wall of the second door body 22.

[0062] Optionally, the multiple blocking member groups 53 are divided into a first blocking component 54 and a second blocking component 55, the second blocking component 55 is located on the side of the first blocking component 54 away from the first door body 21, and the distance between the two blocking members 53 in the first blocking component 54 is greater than the distance between the two blocking members 53 in the second blocking component 55.

[0063] It can be understood that the distance a between the two blocking members 53 in the first blocking assembly 54 and the distance b between the two blocking members 53 in the second blocking assembly 55 are such that a>b. That is, the right end of the second door body 22 enters the buffer groove 511 and continues to move rightward, firstly contacts the two blocking members 53 in the first blocking assembly 54, and the first blocking assembly 54 generates a first resistance to the second door body 22, and then contacts the two blocking members 53 in the second blocking assembly 55, and the second blocking assembly 55 generates a second resistance to the second door body 22, and the second resistance is greater than the first resistance, so that the closer the second door body 22 is to the buffer protrusion 52, the greater the resistance it receives, thereby reducing the impact force when the second door body 22 moves to the third position.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the present utility model, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0069] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations of the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A coal mine tunnel air door protection device, characterized in that: include: A door frame, the door frame being installed in the lane and connected to a wall surface of the lane; A door body assembly, the door body assembly comprising a first door body and a second door body, the first door body is connected to the door frame, the first door body is rotatable around a first circumferential direction between a first position and a second position, The second door body is connected to the first door body, and the door body is movable between a third position and a fourth position along a width direction of the first door body. The first door body is in the first position and the second door body is in the third position, and the door body assembly blocks the lane to block the lane. The first door body is in the first position and the door body is in the fourth position, and the door body assembly blocks part of the lane to make the lane partially conductive. The first door body is in the second position and the second door body is in the fourth position, so that the lane is fully open.

2. The coal mine tunnel air door protection device according to claim 1, characterized in that: The first door body is connected to the first door body to drive the first door body to rotate around a first axis. The second driving member includes a driving body and a driving part, the driving body is connected to the first door body, the driving part connects the driving body and the second door body, and the second driving member is used to drive the second door body to move along the width direction of the first door body.

3. The coal mine tunnel air door protection device according to claim 1, characterized in that: It also includes a driving component, which includes a first driving part and a second driving part, the first driving part is connected to the first door body, the second driving part includes a fixed component and a movable component, the fixed component is connected to the first door body, the movable component connects the fixed component and the second door body, the movable component moves from the third position to the fourth position, and at least a part of the movable component is connected to the first driving part to drive the first door body to rotate around a first axial direction.

4. The coal mine tunnel air door protection device according to any one of claims 2 or 3, characterized in that: The first door body has a mounting groove, the opening of the mounting groove is located at an end of the first door body away from the first axial direction, and at least a part of the second door body is placed in the mounting groove.

5. The coal mine tunnel air door protection device according to claim 4, characterized in that: It also includes a buffer assembly, which includes a buffer member, the buffer member is connected to the door frame, and the buffer member and the first door body are arranged at intervals in the width direction of the alley, the buffer member has a buffer groove, the notch of the buffer groove is arranged toward the first door body, the second door body is in the third position, and the end of the second door body away from the first door body is placed in the buffer groove.

6. The coal mine tunnel air door protection device according to claim 5, characterized in that: The buffer assembly further includes a buffer protrusion, which is connected to the bottom wall of the buffer groove, and an extending direction of the buffer protrusion is consistent with an extending direction of the buffer groove.

7. The coal mine tunnel air door protection device according to claim 6, characterized in that: The buffer assembly also includes a blocking member, which is connected to the side wall of the buffer groove. There are multiple blocking members, and the multiple blocking members are divided into multiple blocking member groups. The multiple blocking member groups are arranged at intervals along the length direction of the buffer groove. One blocking member group includes two blocking members. The blocking members in one blocking member group are relatively arranged along the thickness direction of the second door body. The blocking members are movable along the thickness direction of the second door body, and the blocking members are against the second door body.

8. The coal mine tunnel air door protection device according to claim 7, characterized in that: The blocking member includes a blocking portion, a blocking body and an elastic member, one end of the blocking body is connected to the side wall of the buffer groove, the blocking portion is connected to the other end of the blocking body, the middle part of the blocking body has a protrusion, and the elastic member is connected between the protrusion and the side wall of the buffer groove.

9. The coal mine tunnel air door protection device according to claim 8, characterized in that: In one blocking member group, a distance between two blocking members is smaller than a thickness of the second door body.

10. The coal mine tunnel air door protection device according to claim 9, characterized in that: The plurality of blocking member groups are divided into a first blocking member and a second blocking member, the second blocking member is located on a side of the first blocking member away from the first door body, and a distance between two blocking members in the first blocking member is greater than a distance between two blocking members in the second blocking member.

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