Coal mine ventilation system adjusting device
By employing gear meshing and gradient decreasing tooth design in the regulating components of the coal mine ventilation system, the problems of flow energy loss and unstable regulation caused by the contact between rectangular baffles and circular ventilation pipes are solved, achieving smooth airflow and precise air volume control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG SANHEKOU MINE CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-19
AI Technical Summary
In existing coal mine ventilation control devices, when rectangular baffles come into contact with circular ventilation pipes, sharp edges are easily formed, leading to loss of flow energy and unstable control effect, which affects the flow field continuity and control accuracy of the ventilation system.
The adjustment components include a connecting cylinder, an adjusting cylinder, an adjusting rod, a rack, and a drive rod. Through gear meshing and a gradient decreasing tooth design, the adjusting rod moves in an arc, forming a nearly circular through-hole. This reduces airflow boundary layer separation and local turbulence, thereby lowering flow resistance and noise.
It achieves smooth airflow, reduces flow resistance and noise, improves the accuracy and stability of air volume regulation, avoids sudden geometric changes, and ensures the efficient operation of the ventilation system.
Smart Images
Figure CN224260380U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of coal mine ventilation regulation devices, and in particular to a coal mine ventilation system regulation device. Background Technology
[0002] A coal mine is an area in which humans extract coal resources in a coal-rich mining area. It typically includes roadways, shafts, and mining faces. Coal mines can be divided into underground coal mines and open-pit coal mines depending on the mining method. Underground coal mines are suitable for situations where the coal seam is far from the surface. Coal is extracted by excavating roadways underground. Fans are usually needed in coal mines for ventilation, and the ventilation volume needs to be adjusted through ventilation system regulating devices.
[0003] An existing coal mine ventilation regulating device (publication number: CN222277008U) has at least the following drawbacks: This device regulates the ventilation volume by driving two rectangular baffles and adjusting the gap between the two rectangular baffles. However, since the ventilation pipes and fans in the coal mine ventilation system are all circular structures, the right-angled edges of the rectangular baffles are prone to forming sharp edges during the flow process when they come into contact with the circular holes. This causes discontinuities and separation phenomena in the local flow field, which may not only lead to energy loss of the flow, but also have a certain impact on the linearity of the regulation effect. That is, the change in the effective flow channel area may not be smooth and uniform, and regulation errors or large-amplitude unstable fluctuations may occur. Therefore, this utility model is proposed. Utility Model Content
[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a coal mine ventilation system adjustment device.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A coal mine ventilation system adjustment device includes a ventilation duct. Adjustment components for adjusting the ventilation volume of the ventilation duct are provided on both sides of the outer wall of the ventilation duct. Each adjustment component includes two connecting cylinders respectively connected and fixed to both sides of the outer wall of the ventilation duct. An adjustment cylinder is provided on one side of the connecting cylinder. Several adjustment rods are slidably arranged inside the adjustment cylinder. A rack is fixed to the front side of each adjustment rod. A drive rod is rotatably connected inside the connecting cylinder. Several drive gears are fixed to the outer wall of the drive rod. The drive gears mesh with the racks. The number of teeth on the racks decreases gradually from the outside to the inside along the height direction of the adjustment cylinder. The ratio of the number of teeth on two adjacent racks is five to four. The drive gears are adapted to the corresponding racks.
[0007] As a further embodiment of this utility model, a driven bevel gear is fixed to the top of the drive rod, a drive bevel gear is rotatably connected to the top surface of the adjusting cylinder, the drive bevel gear meshes with the driven bevel gear, a square rod is rotatably connected to the top surface of the connecting cylinder, the two ends of the square rod are slidably inserted with the two drive bevel gears respectively, a hollow shaft motor is fixed to the top surface of the connecting cylinder, and the square rod is installed with the drive shaft of the hollow shaft motor.
[0008] As a further embodiment of this utility model, a protective cover is provided on the top surface of the adjusting cylinder, and the driven bevel gear, the driving bevel gear, the square rod and the hollow shaft motor are all located inside the protective cover.
[0009] As a further embodiment of this utility model, several support frames are fixed inside the adjusting cylinder near the front side. The top and bottom ends of the support frames are rotatably connected to first support wheels, which abut against the front side of the adjusting rod. Several second support wheels are rotatably connected inside the adjusting cylinder near the rear side, and the second support wheels abut against the rear side of the adjusting rod.
[0010] As a further embodiment of this utility model, the adjusting cylinder is detachably installed on one side of the connecting cylinder with bolts, and the two ends of the protective cover are detachably installed on the top surfaces of the two adjusting cylinders with bolts respectively.
[0011] As a further embodiment of this invention, a guide slope is provided on the rear side of the adjusting rod.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] The rotation of the drive rod drives several drive gears, causing the adjusting rod to move inside the ventilation duct. Because the number of teeth on the racks decreases gradually from the outside to the inside along the height of the connecting cylinder, and the ratio of teeth on adjacent racks is 5:4, after one rotation of the drive rod, the adjusting rod closer to the center of the regulating cylinder moves a greater distance than the adjusting rod at the edge, and this movement increases gradually. This results in the line connecting the ends of all the adjusting rods on the regulating cylinder forming an arc. The combined adjusting rods of two regulating cylinders form a nearly circular through-hole, allowing airflow inside the ventilation duct to pass through. As the drive rod continues to drive, the arc-shaped through-hole expands, thus regulating the airflow of the ventilation duct. The effective flow channel formed by the circular through-hole maintains a relatively smooth edge change, avoiding sudden geometric abrupt changes. This allows the airflow to achieve a smoother streamline shape when passing through the opening, reducing boundary layer separation and local turbulence, lowering flow resistance and noise, and achieving more precise airflow control. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of a coal mine ventilation system regulating device proposed in this utility model;
[0015] Figure 2 This is a three-dimensional disassembled structural diagram of a coal mine ventilation system regulating device proposed in this utility model;
[0016] Figure 3 This is a three-dimensional structural diagram of the regulating cylinder of a coal mine ventilation system regulating device proposed in this utility model;
[0017] Figure 4 for Figure 3 A magnified schematic diagram of the partial three-dimensional structure of A.
[0018] In the diagram: 1. Ventilation duct; 2. Connecting duct; 201. Adjusting duct; 202. Adjusting rod; 203. Rack; 204. Drive rod; 205. Drive gear; 206. Driven bevel gear; 207. Drive bevel gear; 208. Square rod; 209. Hollow shaft motor; 3. Protective cover; 4. Support frame; 401. First support wheel; 402. Second support wheel. Detailed Implementation
[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0022] Reference Figures 1-4A coal mine ventilation system adjustment device includes a ventilation cylinder 1. Adjustment components for adjusting the ventilation volume of the ventilation cylinder 1 are provided on both sides of its outer wall. Each adjustment component includes two connecting cylinders 2 respectively connected and fixed to both sides of the outer wall of the ventilation cylinder 1. An adjustment cylinder 201 is provided on one side of the connecting cylinder 2. Several adjustment rods 202 are slidably arranged inside the adjustment cylinder 201. A rack 203 is fixed to the front side of each adjustment rod 202. A drive rod 204 is rotatably connected inside the connecting cylinder 2. Several drive gears 205 are fixed to the outer wall of the drive rod 204. The drive gears 205 mesh with the racks 203. The number of teeth on the racks 203 decreases gradually from the outside to the inside along the height direction of the adjustment cylinder 201. The ratio of the number of teeth on two adjacent racks 203 is five to four. The drive gears 205 are adapted to the corresponding racks 203.
[0023] Reference Figures 2-4 In this embodiment, a driven bevel gear 206 is fixed to the top of the drive rod 204, a drive bevel gear 207 is rotatably connected to the top surface of the adjusting cylinder 201, and the drive bevel gear 207 meshes with the driven bevel gear 206. A square rod 208 is rotatably connected to the top surface of the connecting cylinder 2, and the two ends of the square rod 208 are slidably inserted into the two drive bevel gears 207 respectively. A hollow shaft motor 209 is fixed to the top surface of the connecting cylinder 2, and the square rod 208 is installed on the drive shaft of the hollow shaft motor 209. By starting the hollow shaft motor 209, the square rod 208 is rotated, which in turn drives the drive bevel gear 207 to rotate. The drive bevel gear 207 meshes with the driven bevel gear 206, causing the driven bevel gear 206 to drive the drive rod 204 to rotate, which in turn drives several drive gears 205 to rotate. The drive gears 205 mesh with the rack 203, and the number of teeth on the rack 203 decreases from the outside to the inside along the height direction of the adjusting cylinder 201. The ratio of the number of teeth on two adjacent racks 203 is 5 to 4. When the racks 203 are of equal length, after one revolution of the drive gear 205, the distance traveled between the drive gear 205 (with more teeth) and the rack 203 is reduced by four-fifths compared to the drive gear 205 (with fewer teeth). This results in the line connecting the ends of all the adjusting rods 202 on the adjusting cylinder 201 forming an arc. The adjusting rods 202 of the two adjusting cylinders 201 combine to form a nearly circular through-hole, allowing airflow inside the ventilation duct 1 to pass through. As the drive rod 204 continues to drive, the arc-shaped through-hole expands, thus regulating the airflow of the ventilation duct 1. The effective flow channel formed by the circular through-hole maintains a relatively smooth edge change, avoiding sudden geometric changes. This allows the airflow to achieve a smoother streamline shape when passing through the opening, reducing boundary layer separation and local turbulence, lowering flow resistance and noise, and achieving more precise airflow control.
[0024] Reference Figures 2-4In this embodiment, the top surface of the adjusting cylinder 201 is provided with a protective cover 3. The driven bevel gear 206, the driving bevel gear 207, the square rod 208 and the hollow shaft motor 209 are all arranged inside the protective cover 3. By setting the protective cover 3, the driven bevel gear 206, the driving bevel gear 207, the square rod 208 and the hollow shaft motor 209 can be protected.
[0025] Reference Figures 2-4 In this embodiment, several support frames 4 are fixed inside the adjusting cylinder 201 near the front side. The top and bottom ends of the support frames 4 are rotatably connected to first support wheels 401. The first support wheels 401 abut against the front side of the adjusting rod 202. Several second support wheels 402 are rotatably connected inside the adjusting cylinder 201 near the rear side. The second support wheels 402 abut against the rear side of the adjusting rod 202. The first support wheels 401 and the second support wheels 402 can provide rolling support for the adjusting rod 202, reduce the wear of the adjusting rod 202 and the adjusting cylinder 201, and increase the service life of the device.
[0026] Reference Figures 2-4 In this embodiment, the adjusting cylinder 201 is detachably installed on one side of the connecting cylinder 2 with bolts, and the two ends of the protective cover 3 are detachably installed on the top surfaces of the two adjusting cylinders 201 with bolts respectively. By detachably installing the adjusting cylinder 201 on one side of the connecting cylinder 2 with bolts, and detachably installing the two ends of the protective cover 3 on the top surfaces of the two adjusting cylinders 201 with bolts respectively, it is convenient to disassemble the adjusting cylinder 201 and the protective cover 3 for maintenance of the device.
[0027] Reference Figures 2-4 In this embodiment, a guide slope is provided on the rear side of the adjusting rod 202. By providing a guide slope on the rear side of the adjusting rod 202, the airflow can flow along the guide slope, reducing obstruction to the airflow and reducing local turbulence.
[0028] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: In use, when it is necessary to adjust the air volume of the ventilation duct 1, the hollow shaft motor 209 is started to drive the square rod 208 to rotate, so that the square rod 208 drives the drive bevel gear 207 to rotate. Under the meshing action of the drive bevel gear 207 and the driven bevel gear 206, the driven bevel gear 206 drives the drive rod 204 to rotate, thereby driving several drive gears 205 to rotate. Under the meshing action of the drive gears 205 and the rack 203, and the number of teeth on the racks 203 decreases gradually from the outside to the inside along the height direction of the adjusting cylinder 201, the ratio of the number of teeth on two adjacent racks 203 is five to four. Thus, when the length of the racks 203 is equal, when the drive gear 205 rotates one... After a period of time, the moving distance of the drive gear 205 with more teeth and rack 203 is reduced by four-fifths compared to the drive gear 205 with fewer teeth and rack 203. This makes the line connecting the ends of all the adjusting rods 202 on the adjusting cylinder 201 an arc. The adjusting rods 202 of the two adjusting cylinders 201 combine to form a nearly circular through hole, through which the airflow inside the ventilation cylinder 1 passes. As the drive rod 204 continues to drive, the arc through hole expands, thereby regulating the airflow of the ventilation cylinder 1. The effective flow channel formed by the circular through hole can maintain a relatively smooth edge change, avoiding sudden geometric changes. In this way, the airflow can obtain a smoother streamline shape when passing through the opening, reducing boundary layer separation and local turbulence, reducing flow resistance and noise, and achieving more precise airflow control.
[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A regulating device for a coal mine ventilation system, comprising a ventilation duct (1), characterized in that, Both sides of the outer wall of the ventilation duct (1) are provided with adjustment components for adjusting the ventilation volume of the ventilation duct (1). The adjustment components include two connecting cylinders (2) that are respectively connected and fixed to both sides of the outer wall of the ventilation duct (1). An adjustment cylinder (201) is provided on one side of the connecting cylinder (2). Several adjustment rods (202) are slidably arranged inside the adjustment cylinder (201). A rack (203) is fixed on the front side of the adjustment rod (202). A drive rod (204) is rotatably connected inside the connecting cylinder (2). Several drive gears (205) are fixed on the outer wall of the drive rod (204). The drive gears (205) mesh with the racks (203). The number of teeth on the racks (203) decreases from the outside to the inside along the height direction of the adjustment cylinder (201). The ratio of the number of teeth on two adjacent racks (203) is five to four. The drive gears (205) are adapted to the corresponding racks (203).
2. The regulating device for a coal mine ventilation system according to claim 1, characterized in that, The top end of the drive rod (204) is fixed with a driven bevel gear (206), the top surface of the adjusting cylinder (201) is rotatably connected with a drive bevel gear (207), the drive bevel gear (207) meshes with the driven bevel gear (206), the top surface of the connecting cylinder (2) is rotatably connected with a square rod (208), the two ends of the square rod (208) are respectively slidably inserted with two drive bevel gears (207), the top surface of the connecting cylinder (2) is fixed with a hollow shaft motor (209), and the square rod (208) is installed with the drive shaft of the hollow shaft motor (209).
3. The regulating device for a coal mine ventilation system according to claim 2, characterized in that, The top surface of the regulating cylinder (201) is provided with a protective cover (3), and the driven bevel gear (206), the driving bevel gear (207), the square rod (208) and the hollow shaft motor (209) are all located inside the protective cover (3).
4. A coal mine ventilation system regulating device according to claim 3, characterized in that, Several support frames (4) are fixed inside the adjusting cylinder (201) near the front side. The top and bottom ends of the support frames (4) are rotatably connected to first support wheels (401). The first support wheels (401) abut against the front side of the adjusting rod (202). Several second support wheels (402) are rotatably connected inside the adjusting cylinder (201) near the rear side. The second support wheels (402) abut against the rear side of the adjusting rod (202).
5. A coal mine ventilation system regulating device according to claim 4, characterized in that, The adjusting cylinder (201) is detachably installed on one side of the connecting cylinder (2) by bolts, and the two ends of the protective cover (3) are detachably installed on the top surfaces of the two adjusting cylinders (201) by bolts respectively.
6. A coal mine ventilation system regulating device according to claim 5, characterized in that, A guide slope is provided on the rear side of the adjusting rod (202).