Coal mine air window and adjusting method

Abstract

The application discloses a kind of coal mine air window and adjusting method, comprising: window frame, window frame inside is formed with air duct;Fan leaf, fan leaf at least has first state, second state and third state.In this scheme, the opening and closing of air duct are realized by fan leaf movably connected on window frame;First drive assembly and second drive assembly provide power for the activity of fan leaf, and then the purpose of opening or closing air duct is achieved by changing the attitude of fan leaf;At least one of first drive assembly and second drive assembly drives part of fan leaf to keep third state, and the other of first drive assembly and second drive assembly controls fan leaf to keep first state or second state, to realize the fine control of the air passage area of air duct;Since the cost of the facility for driving fan leaf to keep third state is higher than the cost of the facility only needed to drive fan leaf to convert between first state and second state, therefore, the construction cost is also reduced in the design.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine safety, and in particular to a coal mine air window and a regulating method. BACKGROUND

[0002] Mine ventilation has been one of the elements of safety production, but in actual production, the gas flow rate in the mine is also required to be different according to different production conditions. For mine ventilation equipment, its service life is affected by the working condition, which is lower than that of other equipment under normal working condition, so a facility that can consider economy and accurately control the gas flow rate in the mine is needed. SUMMARY

[0003] Therefore, the present application provides a coal mine air window and a regulating method, which can control the opening degree of the fan leaves through the first driving assembly and the second driving assembly, so as to accurately regulate the gas flow rate.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A coal mine air window comprises:

[0006] a window frame, which is hollow inside and through, forming an air duct for gas flow;

[0007] fan leaves, at least two, which are movably connected with the window frame, and at least have a first state and a second state; when the fan leaves are in the first state, the air duct is closed by the fan leaves; when the fan leaves are in the second state, the air duct is opened to the maximum extent;

[0008] a first driving assembly, which is fixed with the window frame and is used to drive at least one of the fan leaves to change from the first state to the second state;

[0009] a second driving assembly, which is fixed with the window frame and is used to drive other fan leaves to change from the first state to the second state;

[0010] the first driving assembly or the second driving assembly is used to drive at least one of the fan leaves to stay in a third state, which is different from the first state and the second state, and the third state corresponds to any posture of the fan leaves in the process of changing from the first state to the second state;

[0011] the second driving assembly comprises a connecting rod fixedly connected with the fan leaves and a cylinder used to drive the connecting rod to rotate, and the cylinder is movably connected with the connecting rod;

[0012] the connecting rod is reduced in diameter from one end connected with the fan leaves to the other end connected with the cylinder;

[0013] The rotating shafts of the different sashes are parallel to each other;

[0014] The edge of the sash is formed with a thinner avoiding area than other positions, the avoiding area on any sash is matched with the avoiding area on another sash adjacent to it, and the avoiding areas on the adjacent sashes abut against each other when the sashes are in the first state.

[0015] Preferably, the first driving assembly comprises a pneumatic motor, which is fixedly connected with the sash and used to drive the sash to change from the first state to the second state.

[0016] Preferably, the first driving assembly comprises a stroke encoder, which is coaxially arranged with the pneumatic motor and used to record the rotating angle information of the sash.

[0017] Preferably, the stroke encoder and the pneumatic motor are arranged at two ends of the rotating shaft of the sash.

[0018] Preferably, the window frame has a containing space, and the first driving assembly and the second driving assembly are both arranged inside the containing space.

[0019] The application further provides a method for adjusting the coal mine ventilation window, which comprises the coal mine ventilation window, the expected ventilation area of the coal mine ventilation window is a, the maximum ventilation area of any sash that can be opened in the first driving assembly and the second driving assembly is b, and the method comprises the following steps:

[0020] If a is equal to the ventilation area of the sash in the fully opened state, the sash is driven from the first state to the second state by the first driving assembly and the second driving assembly.

[0021] If a > b, one of the first driving assembly and the second driving assembly is used to control part of the sashes to be opened to the second state, and the other one of the first driving assembly and the second driving assembly is used to control the other at least one sash to be opened to the third state, so that the actual ventilation area is equal to the planned ventilation area a.

[0022] If a < b, one of the first driving assembly and the second driving assembly is used to control part of the sashes to be opened to the third state, so that the actual ventilation area is equal to the planned ventilation area a.

[0023] If a = b, one of the first driving assembly and the second driving assembly is used to drive one sash from the first state to the second state.

[0024] If a = 0, the first driving assembly and the second driving assembly drive the fan blade to keep the first state

[0025] From the above technical solutions, the coal mine air window and the adjusting method provided by the present application realize the opening and closing of the air duct through the fan blade movably connected to the window frame; the first driving assembly and the second driving assembly provide power for the movement of the fan blade, and then the purpose of opening or closing the air duct is achieved by changing the posture of the fan blade; at least one of the first driving assembly and the second driving assembly drives part of the fan blade to keep the third state, and the other of the first driving assembly and the second driving assembly controls the fan blade to keep the first state or the second state, thereby realizing fine control of the air-vent window area of the air duct; since the facility for driving the fan blade to keep the third state has a higher cost than the facility for only driving the fan blade to switch between the first state and the second state, the present design also reduces the construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is a structural schematic diagram of a coal mine air window when the fan blade is in the second state according to an exemplary embodiment;

[0028] Figure 2 is a structural schematic diagram of a coal mine air window when the fan blade is in the first state according to an exemplary embodiment;

[0029] Figure 3 is a schematic diagram of a coal mine air window for indicating the position of a travel encoder according to an exemplary embodiment;

[0030] Figure 4 is a structural schematic diagram of a fan blade according to an exemplary embodiment;

[0031] Figure 5 is a logic control diagram of an adjusting method of a coal mine air window according to an exemplary embodiment.

[0032] REFERENCE NUMERALS

[0033] 1, window frame; 11, frame; 12, air duct; 13, accommodating space; 2, fan blade; 21, avoidance area; 22, rotating shaft; 3, first driving assembly; 31, pneumatic motor; 4, second driving assembly; 41, air cylinder; 42, connecting rod; 5, travel encoder. DETAILED DESCRIPTION

[0034] The coal mine air window and the adjusting method can control the opening degree of the fan leaf through the first driving assembly and the second driving assembly, so as to achieve the purpose of accurately regulating the gas flow rate.

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0036] In an exemplary embodiment of the present disclosure, a coal mine air window and an adjusting method are provided, as shown in Figure 1 , Figure 1 is a structural schematic diagram of the coal mine air window when the fan leaf is in the second state according to an exemplary embodiment; Figure 2 is a structural schematic diagram of the coal mine air window when the fan leaf is in the first state according to an exemplary embodiment; Figure 3 is a schematic diagram of the coal mine air window for indicating the position of the travel encoder according to an exemplary embodiment; Figure 4 is a structural schematic diagram of the fan leaf according to an exemplary embodiment; Figure 5 is a logic control diagram of the adjusting method of the coal mine air window according to an exemplary embodiment. The following will be introduced with reference to Figures 1 to 5 .

[0037] Some specific embodiments described below are intended to facilitate the understanding of those skilled in the art by the present embodiments, and the present embodiments are not limited to some specific embodiments described below.

[0038] With reference to Figure 1 , an exemplary embodiment of the present disclosure provides a coal mine air window, which comprises:

[0039] A window frame 1, a plurality of leaves 2, a first driving assembly 3 and a second driving assembly 4. The window frame 1 is hollow and through, forming an air duct 12 for air flow. The plurality of leaves 2 are at least two, and are movably connected with the window frame 1. The plurality of leaves 2 have at least a first state and a second state. When the plurality of leaves 2 are in the first state, the air duct 12 is closed by the plurality of leaves 2. When the plurality of leaves 2 are in the second state, the air duct 12 is opened to the maximum extent. The first driving assembly 3 is fixed with the window frame 1, and is used to drive at least one leaf 2 from the first state to the second state. The second driving assembly 4 is fixed with the window frame 1, and is used to drive other leaves 2 from the first state to the second state. The first driving assembly 3 or the second driving assembly 4 is used to drive at least one leaf 2 to stay in a third state, which is different from the first state and the second state, and corresponds to any posture of the plurality of leaves 2 during the transition from the first state to the second state.

[0040] For example, referring to Figure 1 and Figure 2 The window frame 1 has four frame bodies 11 connected end to end and is in the shape of a square frame body, and the air duct 12 is formed in the area surrounded by the four frame bodies. The plurality of leaves 2 are three and are movably connected in the space surrounded by the four frame bodies 11. The first driving assembly 3 and the second driving assembly 4 are fixed on the same frame body 11. The power output end of the first driving assembly 3 is fixed with one leaf 2. The second driving assembly 4 has two, each corresponding to one leaf 2, and the power output end of the second driving assembly 4 is fixed with the corresponding leaf 2. When the three leaves 2 are in the first state, the three leaves 2 collectively block the air duct 12 in the length direction of the air duct 12. Since the leaves 2 are located inside the area surrounded by the frame bodies 11, the frame bodies 11 can close the space on the side of the leaves 2, and the air duct 12 is closed by the leaves 2. When the leaves 2 are in the second state, the leaves 2 are in the posture that blocks the air duct 12 to the minimum extent, and the air duct 12 is opened to the maximum extent. The air flow along the length direction of the air duct 12 has the maximum flow window when passing through the air duct 12. The first driving assembly 3 and the second driving assembly 4 can both drive the leaves 2 from the first state to the second state. The first driving assembly 3 can also drive the leaves 2 from the first state to the third state. When the leaves 2 are in the third state, the blocking degree of the leaves 2 to the air duct 12 is between the maximum and the minimum. For example, the maximum blocking degree of a single leaf 2 to the air duct 12 is M, the minimum blocking degree of a single leaf 2 to the air duct 12 is m, and the blocking degree of the leaves 2 to the air duct 12 in the third state is q, M > q > m.

[0041] In this embodiment, the three leaves 2 jointly act on the air duct 12 and realize the closing of the air duct 12. The first driving assembly 3 for driving the leaves 2 to the third state is more complex in function than the second driving assembly 4, and therefore the cost is generally higher, so only one first driving assembly 3 is selected to control the leaves 2 to remain in the third state, and the other leaves 2 are converted between the first state and the second state through the second driving assembly 4 with lower cost. In this way, when the expected ventilation area accounts for 50% of the ventilation window area of the air duct 12, a second driving assembly 4 can be selected to drive a leaf 2 to convert from the first state to the second state, at which time the actual ventilation area accounts for 33% of the ventilation window area of the air duct 12, and then a first driving assembly 3 is used to drive a leaf 2 to convert from the first state to the third state in which the actual ventilation area accounts for 17% of the ventilation window area of the air duct 12, so as to achieve the purpose of consistent actual ventilation area and expected ventilation area. Similarly, when the expected ventilation area is less than 33%, the second driving assembly 4 drives the leaves 2 to remain in the first state unchanged, and only the first driving assembly 3 is used to control the leaves 2 to convert from the first state to the third state.

[0042] The third state in this embodiment does not specifically limit the opening degree of the leaves 2, and the third state can be any posture of the leaves 2 in the conversion process from the first state to the second state, and according to the actual required posture of the leaves 2, the third state also includes a fourth state, a fifth state, a sixth state, etc.

[0043] In an example embodiment of the present disclosure, referring to Figure 1 and Figure 2 , the first driving assembly 3 includes a pneumatic motor 31, which is fixedly connected with the leaves 2 and is used to drive the leaves 2 to convert from the first state to the second state.

[0044] For example, referring to Figure 1 and Figure 2 , the leaves 2 are rotationally connected inside the window frame 1, and the rotation axes of different leaves 2 are parallel to each other.

[0045] The pneumatic motor 31 is fixedly connected to the window frame 1, the power output end of the pneumatic motor 31 penetrates through a side frame 11 and extends into the air duct 12 area and is fixedly connected with the leaves 2, the leaves 2 rotate with the pneumatic motor 31 and further convert from the first state to the second state, when the leaves 2 are in the first state, the side wall with the largest surface area of the leaves 2 is perpendicular to the gas flow direction inside the air duct 12, and when the leaves 2 are in the second state, the side wall with the smallest surface area of the leaves 2 is perpendicular to the gas flow direction inside the air duct 12.

[0046] In the embodiment, the pneumatic motor 31 has lower requirements for the operating environment than the conventional electric motor, and is suitable for environments where pollutants are easily generated, such as coal mines. The compressed gas required for the operation of the pneumatic motor 31 can be obtained on site, and the pneumatic motor 31 has a smaller volume and fewer supporting facilities than the hydraulic motor, thereby reducing the occupancy of the roadway space.

[0047] In an example embodiment of the present disclosure, referring to Figure 1 and Figure 2 , the second driving assembly 4 includes a connecting rod 42 fixedly connected with the fan blade 2 and a pneumatic cylinder 41 for driving the connecting rod 42 to rotate, and the pneumatic cylinder 41 is movably connected with the connecting rod 42.

[0048] For example, referring to Figure 4 , the fan blade 2 has a rotating shaft 22, and the end of the rotating shaft 22 extends out of the end of the fan blade 2. The end of the rotating shaft 22 of the fan blade 2 connected with the second driving assembly 4 penetrates the frame 11 and extends to the second driving assembly 4, one end of the connecting rod 42 is fixedly connected with the end of the fan blade 2 extending out of the frame 11, the other end of the connecting rod 42 is hingedly connected with the power output end of the piston rod of the pneumatic cylinder 41, the cylinder body of the pneumatic cylinder 41 is hingedly connected with the window frame 1, the hinged end of the cylinder body of the pneumatic cylinder 41 is located at the end of the cylinder body of the pneumatic cylinder 41 away from the piston rod, and the rotation axis of the cylinder body of the pneumatic cylinder 41 is parallel to the rotation axis of the connecting rod 42.

[0049] In the embodiment, when the piston rod of the pneumatic cylinder 41 extends, since the two ends of the pneumatic cylinder 41 are respectively hingedly connected with the connecting rod 42 and the frame 11, the piston rod of the pneumatic cylinder 41 drives the connecting rod 42 to rotate while the whole pneumatic cylinder 41 deflects, and simultaneously, the fan blade 2 rotates with the connecting rod 42. Since the stroke of the piston rod of the pneumatic cylinder 41 is difficult to accurately control, in order to cooperate with the accurate control of the opening degree of the fan blade 2 by the first driving assembly 3, the fan blade 2 connected with the second driving assembly 4 is only configured to switch between the first state of closing the air duct 12 and the second state of being completely opened.

[0050] In an example embodiment of the present disclosure, referring to Figure 1 and Figure 2 , the connecting rod 42 is reduced in diameter from the end connected with the fan blade 2 to the other end connected with the pneumatic cylinder 41.

[0051] For example, referring to Figure 1 and Figure 2 , the outer diameter of the end of the connecting rod 42 hingedly connected with the piston rod of the pneumatic cylinder 41 is smaller than the outer diameter of the end of the connecting rod 42 fixedly connected with the fan blade 2, and the connecting rod 42 has a horizontal conical column shape.

[0052] In the embodiment, the connecting rod 42 is hinged to the piston rod end of the cylinder 41, so that the included angle between the connecting rod 42 and the piston rod of the cylinder 41 changes when the piston rod of the cylinder 41 works. The outer diameter of the section of the connecting rod 42 hinged to the piston rod of the cylinder 41 is set smaller, so that the interference between the connecting rod 42 and the piston rod of the cylinder 41 during the extension and retraction of the piston rod of the cylinder 41 is reduced, and the operation stability is improved.

[0053] In other embodiments, a relief groove can also be formed in the power output end of the piston rod of the cylinder 41, and a relief groove can also be formed in the connecting rod 42, or the connecting rod 42 and the piston rod can be arranged alternately in up and down directions, so that the interference and jamming between the connecting rod 42 and the piston rod of the cylinder 41 are reduced.

[0054] In an example embodiment of the present disclosure, referring to Figure 2 and Figure 3 , the first driving assembly 3 comprises a stroke encoder 5 coaxially arranged with the pneumatic motor 31, and the stroke encoder 5 is used to record the rotation angle information of the fan blade 2.

[0055] For example, referring to Figure 2 and Figure 3 , the stroke encoder 5 coaxially arranged with the pneumatic motor 31 can more accurately acquire and record the angle signal of the output shaft of the pneumatic motor 31, and further more accurately acquire and record the posture of the fan blade 2, so that the posture of the fan blade 2 is accurately controlled through the collection and feedback of the angle.

[0056] In an example embodiment of the present disclosure, referring to Figure 2 and Figure 3 , the stroke encoder 5 and the pneumatic motor 31 are separately arranged at two ends of the rotating shaft 22 of the fan blade 2.

[0057] For example, referring to Figure 2 and Figure 3 , the stroke encoder 5 is fixed to one end of the fan blade 2 away from the pneumatic motor 31, and the stroke encoder 5 is connected to the end of the rotating shaft 22 of the fan blade 2. The output shaft of the pneumatic motor 31 is coaxially and fixedly connected to the fan blade 2, for example, the output shaft of the pneumatic motor 31 and the rotating shaft 22 of the fan blade 2 are fixed through a shaft coupling.

[0058] In the embodiment, when the stroke encoder 5 is fixed to one end of the fan blade 2 connected with the pneumatic motor 31, the layout of the one end of the fan blade 2 is more crowded, and the heat dissipation requirements of the stroke encoder 5 and the pneumatic motor 31 cannot be guaranteed. And with the continuous rotation of the fan blade 2, the connection between the fan blade 2 and the pneumatic motor 31 can be loose, that is, the angle signal of the output shaft of the pneumatic motor 31 does not match the actual posture of the fan blade 2, so the stroke encoder 5 is directly connected to the rotating shaft 22 of the one end of the fan blade 2 away from the pneumatic motor 31. It can not only meet the needs of heat dissipation space and installation space, but also directly obtain the angle information of the fan blade 2, reduce the angle information error caused by the fitting gap, and achieve the purpose of accurately knowing and further accurately controlling the angle of the fan blade 2.

[0059] In an example embodiment of the present disclosure, referring to Figure 2 and Figure 4 , the edge of the fan blade 2 forms a thinner avoidance area 21 than other positions on the fan blade 2, and the avoidance area 21 on any fan blade 2 is adapted to the avoidance area 21 on another fan blade 2 adjacent thereto. When the fan blade 2 is in the first state, the avoidance areas 21 on the adjacent fan blades 2 abut each other.

[0060] For example, referring to Figure 2 and Figure 4 , the rotating shaft 22 of the fan blade 2 is vertically arranged, the avoidance area 21 is located on both sides of the rotating shaft 22 on the fan blade 2, the thickness of the fan blade 2 gradually decreases from the center position to the edge of the fan blade 2, and the cross section of the fan blade 2 is prismatic. When the three fan blades 2 are in the first state, the edges of the three fan blades 2 are sequentially stacked along the distribution direction of the three fan blades 2, and the avoidance areas 21 on the adjacent two fan blades 2 are abutted.

[0061] In the embodiment, the setting of the avoidance area 21 can reduce the edge thickness of the fan blade 2, thereby reducing the possibility of interference between the fan blade 2 and the adjacent fan blade 2 during rotation, so that the fan blade 2 can rotate smoothly and stably. At the same time, the rotation directions of all the fan blades 2 are consistent when the fan blades 2 are converted from the first state to the second state. When only one or two fan blades 2 need to be opened, the fan blades 2 sequentially stacked along the distribution direction of the fan blades 2 can be smoothly opened, reducing the possibility that a certain fan blade 2 cannot be opened due to being stacked by another fan blade 2, and improving the operation stability.

[0062] In an example embodiment of the present disclosure, referring to Figure 1 and Figure 2 , the window frame 1 has a containing space 13, and the first driving assembly 3 and the second driving assembly 4 are both built-in in the containing space 13.

[0063] For example, referring to Figure 1 and Figure 2The accommodating space 13 is arranged on the top surface of the frame 11 of the window frame 1, the cylinder 41, the connecting rod 42 and the pneumatic motor 31 are fixed in the accommodating space, and the rotating shaft 22 of part of the fan blades 2 extends into the accommodating space through the frame 11 and is fixedly connected with the connecting rod 42.

[0064] In the embodiment, the accommodating space 13 provides mounting space and mounting basis for the first driving assembly 3 and the second driving assembly 4, and can reduce the possibility that dust in the external environment pollutes the first driving assembly 3 and the second driving assembly 4. Meanwhile, the top end of the accommodating space 13 is open, which facilitates maintenance and repair of the first driving assembly 3 and the second driving assembly 4.

[0065] The embodiment of the present disclosure also provides a method for adjusting the coal mine air window, referring to Figure 5 , the expected ventilation area is a, the maximum ventilation area that can be opened by any one of the first driving assembly and the second driving assembly is b. The method for adjusting the coal mine air window comprises the following steps:

[0066] If a is equal to the ventilation area in the full opening state of the fan blades, the first driving assembly and the second driving assembly are used to drive the fan blades to open from the first state to the second state.

[0067] If a > b, one of the first driving assembly and the second driving assembly is used to control part of the fan blades to open to the second state, and the other one of the first driving assembly and the second driving assembly is used to control at least one of the other fan blades to open to the third state, so that the actual ventilation area is equal to the planned ventilation area a.

[0068] If a < b, one of the first driving assembly and the second driving assembly is used to control part of the fan blades to open to the third state, so that the actual ventilation area is equal to the planned ventilation area a.

[0069] If a = b, the first driving assembly or the second driving assembly is used to drive one of the fan blades to open from the first state to the second state.

[0070] If a = 0, the first driving assembly and the second driving assembly are used to drive the fan blades to keep the first state.

[0071] For example, referring to Figure 2 and Figure 5 , when the expected ventilation area is 33%, one of the fan blades 2 can be controlled to rotate to the second state by the pneumatic motor 31, at this time, the fan blade 2 is fully opened. Since three fan blades 2 are arranged in the window frame 1, when a single fan blade 2 is opened to the second state, the actual ventilation area accounts for 33% of the ventilation window area of the air duct 12, at this time, the actual ventilation area is consistent with the expected ventilation area. Similarly, the piston rod of the cylinder 41 can be extended to drive another fan blade 2 to rotate, so that the fan blade 2 rotates to the second state, and the same purpose can also be achieved.

[0072] When the expected ventilation area is 60%, the actual ventilation area can reach 33% by the piston rod of the cylinder 41 extending and driving the vane 2 to rotate to the second state, and the corresponding vane 2 can be opened to the extent that the actual ventilation area is 27% by the pneumatic motor 31 controlling the other vane 2 to rotate to the third state and then keeping the vane 2 in the third state, so as to achieve the purpose of the actual ventilation area being consistent with the expected ventilation area by the opening of the two vanes 2.

[0073] When maximum ventilation is needed, the three vanes 2 can be all switched to the second state to achieve the purpose.

[0074] In the embodiment, the working of the cylinder 41 and the pneumatic motor 31 can be controlled by manual regulation, or the automatic control of the cylinder 41 and the pneumatic motor 31 can be realized by setting a controller.

[0075] It should be noted that the relational terms herein such as first and second, and the like, are used solely to distinguish one from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

Claims

1. A coal mine ventilation window, characterized in that, include: Window frame (1), the interior of which is hollow and through, forming an air duct (12) through which airflow passes; At least two fan blades (2) are movably connected to the window frame (1). Each fan blade (2) has at least a first state and a second state. When the fan blade (2) is in the first state, the air duct (12) is blocked and closed by the fan blade (2). When the fan blade (2) is in the second state, the air duct (12) is opened to the maximum extent. A first drive component (3) is fixed to the window frame (1) and is used to drive at least one of the fan blades (2) to switch from the first state to the second state; The second drive component (4) is fixed to the window frame (1) and is used to drive the other fan blades (2) to switch from the first state to the second state; The first driving component (3) or the second driving component (4) is used to drive at least one of the fan blades (2) to remain in a third state, the third state being different from the first state and the second state, and the third state corresponding to any posture of the fan blade (2) during the transition from the first state to the second state; The second drive assembly (4) includes a connecting rod (42) fixedly connected to the fan blade (2) and a cylinder (41) for driving the connecting rod (42) to rotate, wherein the cylinder (41) is movably connected to the connecting rod (42); The connecting rod (42) is tapered from one end where it connects to the fan blade (2) to the other end where it connects to the cylinder (41); The fan blades (2) are rotatably connected to the inside of the window frame (1), and the rotation axes of different fan blades (2) are parallel to each other; A clearance area (21) thinner than other areas on the fan blade (2) is formed at the edge of the fan blade (2). The clearance area (21) on any fan blade (2) is adapted to the clearance area (21) on the adjacent fan blade (2). When the fan blade (2) is in the first state, the clearance areas (21) on the adjacent fan blades (2) are close to each other.

2. The coal mine ventilation window according to claim 1, characterized in that, The first drive assembly (3) includes a pneumatic motor (31), which is fixedly connected to the fan blade (2) and is used to drive the fan blade (2) to switch from the first state to the second state.

3. The coal mine ventilation window according to claim 2, characterized in that, The first drive component (3) includes a stroke encoder (5), which is coaxially arranged with the pneumatic motor (31) and is used to record the rotation angle information of the fan blade (2).

4. The coal mine ventilation window according to claim 3, characterized in that, The stroke encoder (5) and the pneumatic motor (31) are respectively located at both ends of the shaft (22) of the fan blade (2).

5. The coal mine ventilation window according to claim 1, characterized in that, The window frame (1) has an accommodating space (13), and the first driving component (3) and the second driving component (4) are both built into the accommodating space (13).

6. A method for adjusting a ventilation window in a coal mine, characterized in that, The coal mine ventilation window includes any one of the claims 1-5 above, wherein the expected ventilation area of ​​the coal mine ventilation window is a, and the maximum ventilation area that can be opened by either the first drive component or the second drive component is b; The method for adjusting the coal mine ventilation window includes: If a is equal to the ventilation area when all the fan blades are open, then the fan blades are driven from the first state to the second state by the first drive component and the second drive component. If a > b, then one of the first drive component and the second drive component controls some of the fan blades to open to the second state, and the other of the first drive component and the second drive component controls at least one other fan blade to open to the third state, so that the actual ventilation area is equal to the planned ventilation area a. If a < b, then the fan blades are controlled to open to the third state by one of the first drive component and the second drive component, so that the actual ventilation area is equal to the planned ventilation area a; If a=b, then the fan blade is driven from the first state to the second state by the first driving component or the second driving component; If a=0, the fan blades are driven to maintain the first state by the first driving component and the second driving component.

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