Ventilation device for coal mine operation

Abstract

The invention is applicable to the technical field of mine ventilation, and provides a ventilation device for coal mine operation, which comprises a fan, a main air pipe, a T-shaped pipe, an extension pipe and a connecting bottom plate, the T-shaped pipe is composed of a main pipe, a branch pipe and a collecting module, the ventilation device further comprises a direction adjusting mechanism and an air supply mechanism, and the direction adjusting mechanism comprises a driving assembly, a direction adjusting gear, a direction adjusting frame and a direction adjusting seat. The number of the driving assemblies and the number of the direction adjusting frames are both two. By changing the output states of the two driving assemblies, horizontal and vertical two-dimensional free adjustment of the air outlet direction of the air supply mechanism can be completed, the ventilation requirements of working faces at different positions and at different heights in a branch roadway are met, and the ventilation requirements can be met according to different roadway working positions, heights, dynamic changes and safety risk points. The adaptive airflow direction and coverage range are provided, and the ventilation efficiency and safety of the ventilation device are improved.

Description

Technical Field

[0001] This invention belongs to the field of mine ventilation technology, and particularly relates to a ventilation device for coal mine operations. Background Technology

[0002] In underground coal mine operations, the ventilation system is a core facility for ensuring operational safety and maintaining the working environment. Its core requirement is not only to deliver fresh air, but also to adapt to the complex and ever-changing underground working conditions through precise adjustment of the airflow direction. To adjust the ventilation direction, a coal mine ventilation adjustment and steering structure is required.

[0003] The existing ventilation device adjustment and steering structure is divided into single-dimensional adjustment structure and multi-dimensional adjustment structure. The single-dimensional adjustment structure can only move in one direction and can only achieve ventilation coverage in a fan-shaped plane. It cannot cover the comprehensive three-dimensional needs of horizontal and vertical. It needs to be disassembled or moved and re-fixed at the angle to adapt to the required ventilation needs, and cannot achieve the continuity of coal mine operations.

[0004] Multi-dimensional adjustment structures require separate drive sources for each adjustment dimension, generally requiring more than three drive sources. The multi-drive-source adjustment structure not only increases the complexity of the structure and the ventilation cost of the device, but also requires the control system to achieve synchronous or asynchronous actions in order to complete precise multi-dimensional adjustment. However, coal mines are characterized by harsh environments such as strong dust, high humidity, and vibration, and traditional control systems are prone to problems such as signal interference and asynchronous motor speeds.

[0005] Therefore, in view of the above situation, there is an urgent need to develop a ventilation device for coal mine operations to overcome the shortcomings in current practical applications. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a ventilation device for coal mine operations to solve the problems mentioned in the background.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A ventilation device for coal mine operations includes a fan, the output end of which is connected to a main air duct extending into the main roadway of the mine. The main air duct is connected to extension pipes distributed in branch roadways of the mine via T-shaped pipes. The T-shaped pipes consist of a main pipe, branch pipes, and a collection module. The main pipe is connected to the main air duct, the branch pipes are connected to one end of the extension pipes, the collection module is installed at one end of the main pipe and located near the air inlet end of the main pipe, and a connecting base plate is fixed to the other end of the extension pipe. The device also includes:

[0009] A steering mechanism, comprising a drive assembly, a steering gear, a steering frame, and a steering seat, wherein two drive assemblies and two steering frames are provided, the two drive assemblies are symmetrically mounted on the outside of the connecting base plate, the steering gear is located between the two drive assemblies and meshes with both of them, one end of each of the two steering frames is rotatably mounted on the two drive assemblies, and the other end of each of the two steering frames is fixedly connected to both sides of the steering seat, the steering seat being located in front of the steering gear;

[0010] An air supply mechanism is provided, one end of which is rotatably mounted on a connecting base plate and connected to an extension pipe, and the other end of which is rotatably mounted on a directional seat and fixedly connected to a directional gear. An air outlet is provided on the other end of the air supply mechanism.

[0011] As a further technical solution of the present invention, the drive assembly includes a drive motor, a drive gear, a transmission gear, a mounting cylinder, and a control gear. The drive motor is symmetrically fixed on one side of the connecting base plate. A drive gear is fixed on the output end of the drive motor. The drive gear meshes with the transmission gear fixed on the outer wall of the mounting cylinder. The mounting cylinder is rotatably mounted on the connecting base plate via a bracket. A control gear is also fixed on the outer wall of the mounting cylinder. A steering frame is rotatably mounted inside the mounting cylinder. The control gears are symmetrically distributed on both sides of the steering gear, and the two control gears mesh with the two sides of the steering gear respectively.

[0012] As a further technical solution of the present invention, the driving gear, transmission gear, control gear and directional gear are all bevel gears, and the transmission gear and control gear are concentric and coaxial.

[0013] As a further technical solution of the present invention, the air supply mechanism includes an air inlet pipe, a corrugated pipe, a guide pipe, a Z-shaped pipe, and a tapered pipe. The air inlet pipe is rotatably mounted on the connecting base plate and connected to the extension pipe. One end of the air inlet pipe is connected to one end of the corrugated pipe, and the other end of the corrugated pipe is connected to the guide pipe. The guide pipe is rotatably mounted on the directional seat, and the outer wall of the guide pipe is fixedly connected to the directional gear. A Z-shaped pipe is fixed to one end of the guide pipe, and a tapered pipe is installed at the end of the Z-shaped pipe. An air outlet is provided on the tapered pipe.

[0014] As a further technical solution of the present invention, one end of the air inlet pipe and the guide pipe are provided with connecting holes at equal intervals in the circumference, and silicone plungers are distributed in the circumference on the outer wall of both ends of the corrugated pipe. The silicone plungers are made of silicone material and have an umbrella-shaped columnar structure. The silicone plungers are matched with the connecting holes.

[0015] As a further technical solution of the present invention, the diameter of one end of the tapered tube is smaller than the diameter of the other end, an air-expanding plate is fixed on the inner wall of the tapered tube, and air-expanding holes are distributed on the air-expanding plate. The air-expanding holes located in the middle of the air-expanding plate have a large diameter and are sparsely distributed, while the air-expanding holes located on the outer side of the air-expanding plate have a small diameter and are densely distributed.

[0016] As a further technical solution of the present invention, the diameter of the air inlet pipe is smaller than the diameter of the extension pipe, and a conical air guide is provided on one side of the air inlet pipe. One end of the air guide is matched with the air inlet pipe, and the other end of the air guide extends into the extension pipe and adheres to the inner wall of the extension pipe to form a gradual airflow channel.

[0017] As a further technical solution of the present invention, four spiral blades are circumferentially equidistantly distributed on the inner wall of one end of the main pipe, the included angle between the centers of two adjacent spiral blades is 90 degrees, all four spiral blades are located at the air inlet end of the main pipe, the inner edges of the four spiral blades are tightly fitted with the inner wall of the main pipe, and the outer edges of the four spiral blades do not exceed 1 / 3 of the radius of the main pipe.

[0018] As a further technical solution of the present invention, the spiral blade is a gradient spiral blade, the front end of the spiral blade is far away from the branch pipe, the rear end of the spiral blade is close to the branch pipe, and the blade width and spiral lead of the front end of the spiral blade are both greater than the blade width and spiral lead of the rear end.

[0019] As a further technical solution of the present invention, a guide vane is also installed at the connection between the main pipe and the branch pipe. The guide vane is an arc-shaped guide vane, and the two ends of the guide vane are respectively fixed on the inner walls of the main pipe and the branch pipe. The extension direction of the guide vane in the branch pipe forms a 30-degree angle with the axis of the branch pipe.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The two drive components work synchronously. When the output speeds of the two drive components are in opposite directions, they can drive the directional gear to rotate. The directional gear drives the air outlet of the air supply mechanism to rotate around the axis of the directional gear, thereby achieving horizontal rotation adjustment of the air outlet. Since the output speeds of the two drive components are opposite, the axial forces they output on the two directional frames are also opposite. The axial forces on the two directional frames cancel each other out, so that the directional seat is in a stationary state at this time. That is, the air supply mechanism can rotate freely on the stationary directional seat.

[0022] When the output speeds of the two drive components are in the same direction, the axial forces on the two steering frames are in the same direction and superimposed on each other. At this time, the steering gear is stationary, which makes the air supply mechanism stationary on the steering seat. By applying axial forces in the same direction to the two steering frames, the two drive components can drive the steering seat to rotate around the axis of the output end of the drive components. The steering seat drives the air outlet of the air supply mechanism to rotate, thereby realizing the vertical pitch adjustment of the air outlet.

[0023] By changing the output state of the two drive components, the horizontal and vertical directions of the air supply mechanism can be freely adjusted to meet the ventilation needs of different working faces at different locations and heights in the branch roadway. It can provide an appropriate airflow direction and coverage range according to the different working positions, heights, dynamic changes and safety risk points in the roadway, thereby improving the ventilation efficiency and safety of the ventilation device.

[0024] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a ventilation device for coal mine operations provided in an embodiment of the present invention.

[0026] Figure 2 This is a half-sectional view of the structure of a ventilation device for coal mine operations provided in an embodiment of the present invention.

[0027] Figure 3 for Figure 1 A partial sectional view of the structure from the side.

[0028] Figure 4 for Figure 1 Schematic diagram of the central air intake mechanism and the directional mechanism.

[0029] Figure 5 for Figure 4 A schematic diagram of the central adjustment mechanism.

[0030] Figure 6 for Figure 4 A schematic diagram of the central air intake mechanism.

[0031] Figure 7 for Figure 6 Exploded view of the central air intake mechanism.

[0032] Figure 8 for Figure 2 Enlarged view of the structure at point A in the middle.

[0033] Figure 9 for Figure 3 Enlarged view of the structure at point B.

[0034] Figure 10 for Figure 9 Enlarged view of the structure of the helical blade.

[0035] Reference numerals: 100-Main duct, 200-T-pipe, 210-Main pipe, 220-Branch pipe, 230-Collection module, 300-Extension pipe, 310-Connecting base plate, 400-Air supply mechanism, 410-Air inlet duct, 420-Corrugated pipe, 421-Silicone plunger, 430-Guide pipe, 440-Z-pipe, 450-Conical pipe, 460-Expanding plate, 470-Air guide tube, 480-Connecting hole, 500-Directional adjustment mechanism, 510-Drive assembly, 511-Drive motor, 512-Drive gear, 513-Transmission gear, 514-Mounting shaft, 515-Control gear, 520-Directional adjustment gear, 530-Directional adjustment frame, 540-Directional adjustment seat, 600-Helical blade, 700-Guide vane. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0038] like Figures 1 to 10 As shown, a ventilation device for coal mine operations, provided as an embodiment of the present invention, includes a fan installed outside the mine. The output end of the fan is connected to a main air duct 100 extending into the main roadway of the mine. The main air duct 100 is connected to extension pipes 300 distributed in branch roadways of the mine via T-shaped pipes 200 or Y-shaped pipes. Each T-shaped pipe 200 or Y-shaped pipe consists of a main pipe 210, a branch pipe 220, and a collection module 230. The main pipe 210 is connected to the main air duct 100, the branch pipe 220 is connected to one end of the extension pipe 300, the collection module 230 is installed at one end of the main pipe 210 and located near the air inlet end of the main pipe 210, and a connecting base plate 310 is fixed to the other end of the extension pipe 300. The device also includes:

[0039] A steering mechanism 500 includes a drive assembly 510, a steering gear 520, a steering frame 530, and a steering seat 540. Two drive assemblies 510 and two steering frames 530 are provided. The two drive assemblies 510 are symmetrically installed on the outside of the connecting base plate 310. The steering gear 520 is located between the two drive assemblies 510 and meshes with both of them. One end of each of the two steering frames 530 is rotatably mounted on the two drive assemblies 510, and the other end of each of the two steering frames 530 is fixedly connected to both sides of the steering seat 540. The steering seat 540 is located in front of the steering gear 520.

[0040] An air supply mechanism 400 is provided. One end of the air supply mechanism 400 is rotatably mounted on the connecting base plate 310 and connected to the extension pipe 300. The other end of the air supply mechanism 400 is rotatably mounted on the adjusting seat 540 and fixedly connected to the adjusting gear 520. An air outlet is provided on the other end of the air supply mechanism 400.

[0041] The two drive components 510 work synchronously. When the output speeds of the two drive components 510 are in opposite directions, they can drive the directional gear 520 to rotate. The directional gear 520 drives the air outlet of the air supply mechanism 400 to rotate around the axis of the directional gear 520, thereby achieving horizontal rotation adjustment of the air outlet. Since the output speeds of the two drive components 510 are opposite, the axial forces they output on the two directional frames 530 are also opposite. The axial forces on the two directional frames 530 cancel each other out, so that the directional seat 540 is in a stationary state at this time. That is, the air supply mechanism 400 rotates freely on the stationary directional seat 540.

[0042] When the rotational speeds of the output ends of the two drive components 510 are in the same direction, the axial forces on the two directional frames 530 are in the same direction and superimposed on each other. At this time, the directional gear 520 is stationary, so that the air supply mechanism 400 is stationary on the directional seat 540. By applying axial forces in the same direction to the two directional frames 530, the two drive components 510 can drive the directional seat 540 to rotate around the axis of the output end of the drive component 510. The directional seat 540 drives the air outlet end of the air supply mechanism 400 to rotate, thereby realizing the vertical pitch adjustment of the air outlet end.

[0043] By changing the output state of the two drive components 510, the horizontal and vertical dual-dimensional adjustment of the air outlet direction of the air supply mechanism 400 can be achieved, meeting the ventilation needs of different working faces at different locations and heights in the branch roadway. It can provide an appropriate airflow direction and coverage range according to the different working positions, heights, dynamic changes, and safety risk points in the roadway, thereby improving the ventilation efficiency and safety of the ventilation device.

[0044] In this embodiment, the collection module 230 includes a collection pipe, a collection seat, and a collection box. The two ends of the collection pipe are respectively connected to the collection seat and the main pipe 210. A collection box for collecting dust is slidably installed inside the collection seat.

[0045] like Figures 1 to 5 As shown, in a preferred embodiment of the present invention, the drive assembly 510 includes a drive motor 511, a drive gear 512, a transmission gear 513, a mounting cylinder 514, and a control gear 515. The drive motor 511 is symmetrically fixed on one side of the connecting base plate 310. The drive gear 512 is fixed on the output end of the drive motor 511. The drive gear 512 meshes with the transmission gear 513 fixed on the outer wall of the mounting cylinder 514. The mounting cylinder 514 is rotatably mounted on the connecting base plate 310 via a bracket. The control gear 515 is also fixed on the outer wall of the mounting cylinder 514. A steering frame 530 is rotatably mounted inside the mounting cylinder 514. The control gears 515 are symmetrically distributed on both sides of the steering gear 520, and the two control gears 515 mesh with the two sides of the steering gear 520 respectively.

[0046] The drive gear 512, transmission gear 513, control gear 515 and directional gear 520 are preferably bevel gears, and the transmission gear 513 and control gear 515 are concentric and coaxial.

[0047] When the two drive motors 511 work synchronously and output speeds in opposite directions, the two drive motors 511 drive their respective drive gears 512 to rotate. The drive gears 512 drive the transmission gears 513 to rotate. The transmission gears 513 drive the control gears 515 to rotate through the mounting cylinder 514. At this time, the rotation directions of the two control gears 515 and the mounting cylinder 514 are opposite, and the axial forces applied by the two mounting cylinders 514 to the two adjusting frames 530 are also opposite. The axial forces on the two adjusting frames 530 cancel each other out, so that the adjusting seat 540 is in a stationary state. The two control gears 515 can drive the adjusting gear 520 to rotate by rotating in opposite directions. The adjusting gear 520 drives the air outlet of the air supply mechanism 400 to rotate around the axis of the adjusting gear 520, thereby realizing the horizontal rotation adjustment of the air outlet.

[0048] When the two drive motors 511 work synchronously and output speeds in the same direction, the two drive motors 511 drive their respective drive gears 512 to rotate. The drive gears 512 drive the transmission gears 513 to rotate. The transmission gears 513 drive the control gears 515 to rotate through the mounting cylinder 514. At this time, the rotation directions of the two control gears 515 and the mounting cylinder 514 are the same. The axial forces applied by the two mounting cylinders 514 to the two directional frames 530 are the same and superimposed on each other. By rotating in the same direction and cooperating with the mounting cylinder 514, the two control gears 515 can drive the directional seat 540 to rotate around the axis of the output end on the drive assembly 510. The directional seat 540 drives the air outlet end of the air supply mechanism 400 to rotate, realizing the vertical pitch adjustment of the air outlet end. At this time, the directional gear 520 is stationary relative to the directional seat 540.

[0049] In a preferred embodiment, the bogie 530 preferably adopts a U-shaped columnar structure;

[0050] The outer wall of one end of the steering frame 530 is connected to the inner wall of the mounting cylinder 514 through a thrust roller bearing. This allows for radial positioning of the steering frame, enabling the axial force output by the drive assembly 510 to be transmitted to the steering frame 530 with almost no loss. This ensures that the axial force is sufficient to overcome the gravity of the steering seat 540 and the air supply mechanism 400, achieving smooth adjustment.

[0051] like Figures 1 to 8 As shown, in a preferred embodiment of the present invention, the air supply mechanism 400 includes an air inlet pipe 410, a corrugated pipe 420, a guide pipe 430, a Z-shaped pipe 440, and a tapered pipe 450. The air inlet pipe 410 is rotatably mounted on the connecting base plate 310 and connected to the extension pipe 300. One end of the air inlet pipe 410 is connected to one end of the corrugated pipe 420, and the other end of the corrugated pipe 420 is connected to the guide pipe 430. The guide pipe 430 is rotatably mounted on the directional seat 540, and the outer wall of the guide pipe 430 is fixedly connected to the directional gear 520. One end of the guide pipe 430 is fixed with a Z-shaped pipe 440, and the end of the Z-shaped pipe 440 is fitted with a tapered pipe 450. An air outlet is provided on the tapered pipe 450.

[0052] One end of the air inlet pipe 410 and the guide pipe 430 is provided with circumferentially equidistant connecting holes 480. The outer walls of both ends of the corrugated pipe 420 are circumferentially distributed with silicone plungers 421. The silicone plungers 421 are preferably made of silicone material and have an umbrella-shaped cross-section. The silicone plungers 421 cooperate with the connecting holes 480.

[0053] The diameter of one end of the tapered tube 450 is smaller than that of the other end. To achieve the air expansion function, an air expansion plate 460 is fixed on the inner wall of the tapered tube 450. Air expansion holes are distributed on the air expansion plate 460. The air expansion holes in the middle of the air expansion plate 460 have large diameters and are sparsely distributed, while the air expansion holes on the outer side of the air expansion plate 460 have small diameters and are densely distributed. The air expansion holes in the middle can reduce the resistance of the central airflow and ensure that the central wind speed is moderate, while the air expansion holes on the outer side can disperse the airflow and increase the edge wind speed, thereby increasing the ventilation coverage and expanding the ventilation operation area.

[0054] The diameter of the air inlet pipe 410 is smaller than that of the extension pipe 300. A tapered air guide duct 470 is provided on one side of the air inlet pipe 410. One end of the air guide duct 470 is engaged with the air inlet pipe 410, and the other end of the air guide duct 470 extends into the extension pipe 300 and fits against the inner wall of the extension pipe 300, forming a gradual airflow channel. This guides the airflow in the extension pipe 300 to smoothly enter the air inlet pipe 410, avoiding the generation of turbulence, reducing airflow resistance, and ensuring the amount of airflow delivered from the extension pipe 300 to the air inlet pipe 410.

[0055] When the directional gear 520 rotates, it drives the guide tube 430 to rotate on the directional seat 540. The guide tube 430 drives the conical tube 450 to rotate circumferentially through the Z-shaped tube 440, thereby achieving horizontal rotation adjustment of the air outlet. When the directional frame 530 drives the directional seat 540 to rotate, both the guide tube 430 and the directional gear 520 are stationary relative to the directional seat 540. The directional seat 540 drives the guide tube 430 to rotate, and the guide tube 430 drives the conical tube 450 to rotate through the Z-shaped tube 440, thereby achieving vertical pitch adjustment of the air outlet.

[0056] like Figure 3 , Figure 9 and Figure 10 As a preferred embodiment of the present invention, four spiral blades 600 are circumferentially equidistantly distributed on the inner wall of one end of the main pipe 210. The included angle between the centers of two adjacent spiral blades 600 is 90 degrees, which ensures that the airflow is subjected to balanced force on the cross-section of the pipe and avoids local airflow turbulence caused by uneven distribution of the spiral blades 600. All four spiral blades 600 are located at the air inlet end of the main pipe 210. The inner edges of the four spiral blades 600 are in close contact with the inner wall of the main pipe 210, and the outer edges of the four spiral blades 600 do not exceed 1 / 3 of the radius of the main pipe 210. This can ensure the swirling guidance capability and reserve sufficient airflow channel.

[0057] like Figure 3 , Figure 9 and Figure 10As shown, the helical blade 600 is preferably a gradient helical blade 600. The front end of the helical blade 600 is far from the branch pipe 220, and the rear end of the helical blade 600 is close to the branch pipe 220. The blade width and helical lead of the front end of the helical blade 600 are both greater than those of the rear end. The helical blade 600 gradually transitions from a wide strip shape to a narrow strip shape in the cross-section of the pipe, thus forming a dual linear gradient layout of width and lead within the main pipe 210. This allows the wind energy entering the main pipe 210 to be received by the larger helical blade 600. As the contact area gradually gains rotational function, the width of the spiral blade 600 narrows and the lead becomes steeper, and the rotational speed of the airflow in the main pipe 210 gradually increases. This incremental swirling flow ensures the strong centrifugal force required for dust separation while avoiding a sudden increase in airflow resistance caused by abrupt changes in swirling flow intensity. This allows the dust to be thrown against the inner wall of the main pipe 210 by centrifugal force, and the dust thrown against the pipe wall can slide down the inner wall of the pipe into the collection module 230 under the action of gravity, preventing the dust from entering the branch pipe 220 or the working surface with the airflow, reducing the risk of pneumoconiosis and dust explosion, and protecting the working environment of the branch roadway.

[0058] A guide vane 700 is also installed at the connection between the main pipe 210 and the branch pipe 220. The guide vane 700 is preferably an arc-shaped guide vane 700. The two ends of the guide vane 700 are respectively fixed to the inner walls of the main pipe 210 and the branch pipe 220 to ensure that the airflow can be guided to the correct direction before entering the branch pipe 220. The extension direction of the guide vane 700 in the branch pipe 220 forms a 30-degree angle with the axis of the branch pipe 220. This allows the swirling airflow in the main pipe 210 to be decomposed into a component velocity along the axial direction of the branch pipe 220, avoiding the airflow directly impacting the inner wall of the branch pipe 220.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ventilation device for coal mine operations, comprising a fan, the output end of which is connected to a main air duct extending into the main roadway of the mine, the main air duct being connected to extension pipes distributed in branch roadways of the mine via T-shaped pipes, the T-shaped pipes comprising a main pipe, branch pipes, and a collection module, the main pipe being connected to the main air duct, the branch pipes being connected to one end of the extension pipes, the collection module being installed at one end of the main pipe and located near the air inlet end of the main pipe, and a connecting base plate being fixed to the other end of the extension pipe, characterized in that... Also includes: A steering mechanism, comprising a drive assembly, a steering gear, a steering frame, and a steering seat, wherein two drive assemblies and two steering frames are provided, the two drive assemblies are symmetrically mounted on the outside of the connecting base plate, the steering gear is located between the two drive assemblies and meshes with both of them, one end of each of the two steering frames is rotatably mounted on the two drive assemblies, and the other end of each of the two steering frames is fixedly connected to both sides of the steering seat, the steering seat being located in front of the steering gear; An air supply mechanism is provided, one end of which is rotatably mounted on a connecting base plate and connected to an extension pipe, and the other end of which is rotatably mounted on a directional seat and fixedly connected to a directional gear. An air outlet is provided on the other end of the air supply mechanism.

2. The ventilation device for coal mine operations according to claim 1, characterized in that, The drive assembly includes a drive motor, a drive gear, a transmission gear, a mounting cylinder, and a control gear. The drive motor is symmetrically fixed on one side of the connecting base plate. A drive gear is fixed on the output end of the drive motor. The drive gear meshes with the transmission gear fixed on the outer wall of the mounting cylinder. The mounting cylinder is rotatably mounted on the connecting base plate via a bracket. A control gear is also fixed on the outer wall of the mounting cylinder. A steering frame is rotatably mounted inside the mounting cylinder. The control gears are symmetrically distributed on both sides of the steering gear, and the two control gears mesh with the two sides of the steering gear, respectively.

3. The ventilation device for coal mine operations according to claim 2, characterized in that, The drive gear, transmission gear, control gear, and directional gear are all bevel gears, and the transmission gear and control gear are concentric and coaxial.

4. The ventilation device for coal mine operations according to claim 1, characterized in that, The air supply mechanism includes an air inlet pipe, a corrugated pipe, a guide pipe, a Z-shaped pipe, and a tapered pipe. The air inlet pipe is rotatably mounted on the connecting base plate and connected to the extension pipe. One end of the air inlet pipe is connected to one end of the corrugated pipe, and the other end of the corrugated pipe is connected to the guide pipe. The guide pipe is rotatably mounted on the directional seat, and the outer wall of the guide pipe is fixedly connected to the directional gear. A Z-shaped pipe is fixed to one end of the guide pipe, and a tapered pipe is installed at the end of the Z-shaped pipe. An air outlet is provided on the tapered pipe.

5. The ventilation device for coal mine operations according to claim 4, characterized in that, Both the air inlet pipe and the guide pipe have circumferentially equidistant connecting holes at one end. The outer walls of both ends of the corrugated pipe are circumferentially distributed with silicone plungers. The silicone plungers are made of silicone material and have an umbrella-shaped cross-section. The silicone plungers are matched with the connecting holes.

6. The ventilation device for coal mine operations according to claim 4, characterized in that, The diameter of one end of the tapered tube is smaller than the diameter of the other end. An air-expanding plate is fixed on the inner wall of the tapered tube. Air-expanding holes are distributed on the air-expanding plate. The air-expanding holes located in the middle of the air-expanding plate have a large diameter and are sparsely distributed, while the air-expanding holes located on the outer side of the air-expanding plate have a small diameter and are densely distributed.

7. The ventilation device for coal mine operations according to claim 4, characterized in that, The diameter of the air inlet pipe is smaller than that of the extension pipe. A tapered air guide is provided on one side of the air inlet pipe. One end of the air guide is matched with the air inlet pipe, and the other end of the air guide extends into the extension pipe and adheres to the inner wall of the extension pipe to form a gradual airflow channel.

8. The ventilation device for coal mine operations according to claim 1, characterized in that, Four spiral blades are circumferentially evenly distributed on the inner wall of one end of the main pipe. The included angle between the centers of two adjacent spiral blades is 90 degrees. All four spiral blades are located at the air inlet end of the main pipe. The inner edges of the four spiral blades are in close contact with the inner wall of the main pipe, and the outer edges of the four spiral blades do not exceed 1 / 3 of the radius of the main pipe.

9. The ventilation device for coal mine operations according to claim 8, characterized in that, The helical blade is a type of tapered helical blade. The front end of the helical blade is far away from the branch pipe, and the rear end of the helical blade is close to the branch pipe. The blade width and helical lead of the front end of the helical blade are both greater than the blade width and helical lead of the rear end.

10. The ventilation device for coal mine operations according to claim 1, characterized in that, A guide vane is also installed at the connection between the main pipe and the branch pipe. The guide vane is an arc-shaped guide vane. The two ends of the guide vane are fixed to the inner walls of the main pipe and the branch pipe, respectively, and the extension direction of the guide vane in the branch pipe forms a 30-degree angle with the axis of the branch pipe.

Images