A ventilation device for coal mines with adjustable air volume

Abstract

The present invention discloses a ventilation device for coal mines with adjustable air volume, including a fan cylinder and two groups of fans installed inside the fan cylinder, an air volume adjustment component at the air outlet end of the fan cylinder, and an air volume adjustment component including a windshield bracket fixed on the inner wall of the fan cylinder, the windshield bracket is overall cross-shaped and used to place the windshield, and the windshield bracket is annularly distributed with four hinge shafts near the center thereof, each hinge shaft is fixedly connected to the windshield bracket, and a plurality of windshields are respectively rotatably sleeved on the circumferential surface thereof, and the plurality of windshields are stacked in sequence along the axial direction of the hinge shaft, and a flexible polyester cloth is connected between each two adjacent windshields. The air volume adjustment component proposed by the present invention can not only meet the demand for adjusting the air volume, but also minimize the blocking effect of the windshield bracket on the airflow, so that the wind generated by the fan is blown to the working surface to the maximum extent.

Description

Technical Field

[0001] The invention relates to the field of coal mine ventilation equipment, and in particular to a coal mine ventilation equipment with adjustable air volume. Background Art

[0002] In the production process of underground mines, fans are one of the indispensable equipment, which can provide fresh air flow for the workers at the working face, thereby ensuring the normal operation of production operations. In the early stage of tunnel mining, the distance between the fan and the working face is relatively close, so the wind flow at the working face is relatively large. As the tunnel is continuously mined forward, the distance between the fan and the working face becomes farther and farther. When the distance between the working face and the fan exceeds the specified value (usually 1000 meters), the wind flow blown by the fan cannot meet the demand of diluting gas at the working face, so it is necessary to transfer the fan toward the working face. In the early stage of tunnel mining, the wind flow generated by the fan is very large, which is definitely no problem to meet the breathing and dilution of gas by the workers at the working face, but too large wind flow will make the temperature of the working face lower. Workers at the working face are engaged in physical labor, and they are prone to colds when they encounter large wind flow after sweating. When the fan is close to the working face, the working environment of the working face is not friendly to the workers, so it is necessary to adjust the air volume of the fan so that it can not only meet the production needs, but also improve the on-site working environment.

[0003] At present, fans with adjustable air volume generally install a ventilation plate with a hole structure at the air outlet of the fan, and then rotatably install a rotating plate of the same specification on one side of the ventilation plate. The size of the hole structure is changed by rotating the rotating plate to control the air volume. Such a design actually limits the ventilation area on the ventilation plate, and the airflow generated by the fan cannot pass through the ventilation plate smoothly, which will cause the overall air volume of the fan to decrease, which not only causes energy waste, but also increases the frequency of the fan moving toward the working surface. Therefore, the existing fans with adjustable air volume still have many inconveniences in actual use. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a ventilation device for coal mines with adjustable air volume.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a ventilation device for coal mines with adjustable air volume, comprising a fan cylinder and two groups of fans installed inside the fan cylinder, an air volume adjustment component is arranged at the air outlet end of the fan cylinder, the air volume adjustment component comprises a wind shield bracket fixed on the inner wall of the fan cylinder, the wind shield bracket is arranged in a cross shape as a whole for placing the wind shield, four hinge shafts are arranged in a ring near the center of the wind shield bracket, each hinge shaft is fixedly connected to the wind shield bracket, and a plurality of wind shields are rotatably sleeved on the circumferential surface thereof, the plurality of wind shields are stacked in sequence along the axial direction of the hinge shaft, a flexible polyester cloth is connected between each two adjacent wind shields, and the air outlet of the fan is controlled by controlling the rotation angle of the wind shield at the outermost side of each hinge shaft.

[0006] Preferably, an arc-shaped limit seat matching the rotation track of the end of the wind deflector is formed on the inner wall of the fan cylinder;

[0007] A fifth gear is rotatably installed on the surface of all the outermost windshields, and meshing teeth meshing with the fifth gear are distributed on the arc-shaped limit clamp. After each hinge shaft passes through the windshield, a sixth gear is rotatably sleeved on it. A first circular plate is rotatably installed at the center of the windshield bracket, and a third annular rack is fixedly sleeved on the periphery of the first circular plate. All sixth gears are meshed with the third annular rack, and the end of the fifth gear facing away from the windshield is fixedly connected to the first sprocket, and the end of each sixth gear facing away from the windshield is fixedly connected to the second sprocket, and a transmission connection is established between the first sprocket and the second sprocket via a sleeve chain.

[0008] Preferably, a guide block is fixed on the side of each arc-shaped limit card seat facing the fan, the back-flow surface of the guide block is respectively in contact with the inner wall of the fan cylinder and the arc-shaped limit card seat, and the front-flow surface is in an inclined structure.

[0009] Preferably, a filter is provided at the air inlet end of the fan cylinder.

[0010] Preferably, the outer wall of the fan cylinder has a hollow double-layer structure, and a first annular rack is rotatably installed in the interlayer of the fan cylinder. The inner side of the first annular rack penetrates into the interior of the fan cylinder and is integrally connected with a cleaning brush, which is arranged through the center of the first annular rack.

[0011] Preferably, a second annular rack is rotatably mounted inside the fan cylinder at the front end of the windshield bracket, and the second annular rack can rotate synchronously with the first annular rack;

[0012] A connecting plate is fixed to the inner side of the second annular rack, and the connecting plate is arranged through the center of the second annular rack. A second spiral groove begins to be formed on the plate surface of the first circular plate, and the second spiral groove extends from the outer side of the first circular plate toward the center of the first circular plate in a clockwise direction, and the rotation angle of the second spiral groove is 360°;

[0013] A limit groove is provided on the surface of the connecting plate, and a slider is installed inside the limit groove along its length direction. A screw is installed inside the slider along the width direction of the connecting plate. The screw can move along its axial direction and extend into the second spiral groove.

[0014] Preferably, a connecting column is fixedly connected at the center of the first circular plate, and the connecting column extends toward the center of the connecting plate and penetrates through the other side thereof and is fixedly connected to the second circular plate. The second circular plate and the first circular plate have the same specifications, and a first spiral groove is provided on the plate surface of the second circular plate on the side facing the connecting plate. The first spiral groove extends from the outer side of the second circular plate in a counterclockwise direction toward the center of the second circular plate. The rotation angle of the first spiral groove is 360°, and the screw can move along its axial direction to extend to the first spiral groove.

[0015] Preferably, a nut block is rotatably installed on the side of the slider facing away from the windshield bracket, the nut block is threadedly connected to the screw, a third gear is fixedly sleeved on the outside of the nut block, a second motor is installed above the nut block, and a fourth gear meshing with the third gear is fixedly sleeved on the motor shaft of the second motor.

[0016] Preferably, a spring is connected to one end of the slider away from the center of the connecting plate, and the other end of the spring is connected to the limiting groove. A top column is arranged on the inner side of the spring, one end of the top column is fixed on the inner wall of the limiting groove, and the other end abuts against the slider, so that the spring is in a stretched state in the initial state.

[0017] Preferably, two housings are connected to the outer wall of the fan cylinder, and a first gear and a second gear are rotatably mounted inside the two housings respectively, the first gear and the second gear are connected by a shaft, the first gear is meshed with the first annular rack, and the second gear is meshed with the second annular rack;

[0018] A protective seat is fixedly connected to the outer wall of the fan cylinder at a position corresponding to the shaft. The shaft is arranged inside the protective seat and is rotatably connected thereto. A first motor is also installed outside one of the covers.

[0019] Compared with the prior art, the present invention provides a ventilation device for coal mines with adjustable air volume, which has the following beneficial effects:

[0020] (1) The air volume adjustment component in the present invention adopts a cross-shaped windshield bracket, which itself has a large ventilation area and a small blocking effect on the wind flow. All windshields are hidden on the inner side of the windshield bracket in the initial state and will not block the wind flow. When the air volume of the fan needs to be adjusted, the windshield rotates relative to the windshield bracket to change its ventilation area. The design of this structure can not only meet the demand for adjusting the air volume, but also minimize the blocking effect of the windshield bracket on the wind flow, so that the wind generated by the fan is blown to the working surface to the greatest extent.

[0021] (2) In the ventilation equipment proposed by the present invention, before the ventilation volume of the fan is adjusted, the cleaning brush will be driven to rotate 360° to clean the filter. After the cleaning brush rotates 360°, all the outermost wind shields will rotate around the hinge axis to adjust the ventilation area of ​​the wind shield bracket. In other words, each time the ventilation equipment adjusts the ventilation volume, the cleaning brush can be started in advance, and the dust removal operation of the filter and the air volume adjustment of the fan can be carried out simultaneously to ensure the air supply demand of the equipment to the working surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural schematic diagram of the entire ventilation equipment in the embodiment;

[0024] Figure 2 This is a schematic diagram of the assembly of the filter screen and the cleaning brush installed at the air outlet of the fan in the embodiment;

[0025] Figure 3 A schematic diagram of the connection between the cleaning brush and the first annular rack in the embodiment;

[0026] Figure 4 is a schematic diagram of an air volume adjustment component installed at the air inlet end of a fan in an embodiment;

[0027] Figure 5 is a schematic diagram of the connection between the connecting plate and the second annular rack in the embodiment;

[0028] Figure 6 This is a schematic diagram of the installation of various structures inside the upper limit groove of the connecting plate in the embodiment;

[0029] Figure 7 Schematic diagram of the structure of the front end of the windshield bracket in the embodiment;

[0030] Figure 8 Schematic diagram of the structure of the back of the windshield bracket in the embodiment;

[0031] Fig. 9 is a schematic diagram of the windshield in the initial state in the windshield bracket in the embodiment;

[0032] Fig.10 It is a schematic diagram of the connection of two circular plates in the embodiment;

[0033] Fig.11 Schematic diagram of the distribution of gears and sprockets on the windshield in the embodiment;

[0034] Fig.12 This is a schematic diagram of the assembly of the screw rod and two circular plates in the embodiment;

[0035] Fig.13 Schematic diagram of the wind shield in the embodiment when it is in working state.

[0036] In the figure: 1. fan cylinder; 2. base; 3. first motor; 4. cover; 5. protective seat; 6. filter; 7. first gear; 8. first annular rack; 9. cleaning brush; 10. second gear; 11. second annular rack; 12. connecting plate; 13. limit groove; 14. screw; 15. slider; 16. nut block; 17. third gear; 18. fourth gear; 19. second motor; 20. spring; 21. wind shield bracket; 22. arc limit holder; 23. hinge shaft; 24. meshing teeth; 25. guide block; 26. wind shield; 27. first circular plate; 28. second circular plate; 29. ​​fifth gear; 30. sixth gear; 31. first sprocket; 32. second sprocket; 33. chain; 34. connecting column; 35. first spiral groove; 36. second spiral groove; 37. flexible polyester cloth. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0038] This embodiment provides a ventilation device for coal mines with adjustable air volume, such as Figures 1 to 13As shown, it includes a fan cylinder 1 and two groups of fans installed inside the fan cylinder 1, and the bottom of the fan cylinder 1 is connected to two bases 2 along its length direction. The air outlet end of the fan cylinder 1 is installed with an air volume adjustment component, which includes a windshield bracket 21 fixed on the inner wall of the fan cylinder 1. The windshield bracket 21 is arranged in a cross shape as a whole for placing a windshield 26. The windshield bracket 21 is annularly distributed with four hinge shafts 23 near the center thereof, and each hinge shaft 23 is fixedly connected to the windshield bracket 21, and a plurality of windshields 26 are rotatably sleeved on the circumferential surface thereof, and the plurality of windshields 26 are stacked in sequence along the axial direction of the hinge shaft 23, and a flexible polyester cloth 37 is connected between each two adjacent windshields 26. In the initial state, all the wind shields 26 are located on the inner side of the wind shield bracket 21, and the only area inside the fan cylinder 1 where the wind shield bracket 21 is located blocks the wind flow. The wind shield bracket 21 with a cross-shaped structure has a much smaller blocking effect on the wind flow than the prior art, so the air supply of the fan can be guaranteed, and the air output of the fan reaches a maximum at this time. When the air output of the fan needs to be reduced, the outermost wind shield 26 on each hinge shaft 23 rotates clockwise synchronously, and the remaining wind shields 26 rotate in turn under the action of the flexible polyester cloth 37. By controlling the rotation angle of the outer wind shield 26, the air output of the fan can be controlled.

[0039] The windshield bracket 21 in the present application has a cross-shaped structure on its inner side with a larger ventilation area, so it has less blocking effect on the wind flow. All the windshields 26 are hidden on the inner side of the windshield bracket 21 in the initial state and will not block the wind flow. When the wind volume of the fan needs to be adjusted, the windshield 26 rotates relative to the windshield bracket 21 to change its air volume. The design of this structure can not only meet the demand for adjusting the air volume, but also minimize the blocking effect of the windshield bracket 21 on the wind flow, so that the wind generated by the fan blows to the working surface to the greatest extent.

[0040] In the above scheme, the structure design of synchronous rotation of the outermost windshield plate 26 of each hinge shaft 23 is as follows: first, since the hinge shaft 23 is not located at the center of the windshield plate bracket 21, when the windshield plate 26 rotates around the hinge shaft 23, a gap is formed between the outer end of the windshield plate 26 and the inner wall of the fan cylinder 1. In order to avoid the formation of a gap between the windshield plate 26 and the inner wall of the fan cylinder 1, the present application forms a rotation track shape corresponding to the end of the windshield plate 26 on the inner wall of the fan cylinder 1. There is an arc-shaped limit card seat 22 adapted thereto. When the wind shield 26 rotates, its end rotates inside the arc-shaped limit card seat 22. One end of all the wind shields 26 is limited by the hinge shaft 23, and the other end is limited by the arc-shaped limit card seat 22. When it blocks the wind flow, since both ends of the wind shield 26 can be subjected to force, the stability of the wind shield 26 can be improved. At the same time, the existence of the arc-shaped limit card seat 22 can also prevent the wind flow from flowing out of the gap between the wind shield 26 and the fan cylinder 1. On this basis, the present application has a fifth gear 29 rotatably installed on the surface of all the outermost windshield plates 26, and meshing teeth 24 meshing with the fifth gear 29 are distributed on the arc-shaped limit clamp 22. After each hinge shaft 23 passes through the windshield plate 26, a sixth gear 30 is rotatably sleeved. A first circular plate 27 is rotatably installed at the center of the windshield bracket 21, and a third annular rack is fixedly sleeved on the periphery of the first circular plate 27. All sixth gears 30 are meshed with the third annular rack. The end of the fifth gear 29 facing away from the windshield plate 26 is fixedly connected to the first sprocket 31. The end of the gear 30 facing away from the windshield 26 is fixedly connected to the second sprocket 32, and a transmission connection is established between the first sprocket 31 and the second sprocket 32 ​​via a sleeve chain 33. By driving the first circular plate 27 to rotate clockwise, all the sixth gears 30 are driven to rotate counterclockwise through the third annular rack, and then with the help of the transmission of the second sprocket 32 ​​and the first sprocket 31, all the fifth gears 29 are synchronously rotated counterclockwise. The fifth gear 29 meshes with the meshing teeth 24 during the counterclockwise rotation, thereby driving the windshield 26 on the outside to rotate clockwise around the hinge shaft 23.

[0041] Since an arc-shaped limit card seat 22 is arranged on the inner wall of the fan barrel 1 in the present invention, the existence of the arc-shaped limit card seat 22 will block the wind flow. In order to reduce the blocking effect of the arc-shaped limit card seat 22 on the wind flow, a guide block 25 is fixed on the side of each arc-shaped limit card seat 22 facing the fan. The back surface of the guide block 25 is respectively in contact with the inner wall of the fan barrel 1 and the arc-shaped limit card seat 22, and the front surface is in an inclined structure. The guide block 25 can guide the wind flow generated by the fan to prevent the wind flow from staying in the area between the arc-shaped limit card seat 22 and the inner wall of the fan barrel 1.

[0042] During the operation of the entire ventilation equipment, the wind flow in the lane enters from the negative pressure end of the fan cylinder 1 under the action of the fan. Since there is a lot of dust in the lane, in order to prevent the dust from being blown into the working surface, a filter 6 is usually set at the air inlet end of the fan cylinder 1, and the dust in the air is filtered through the filter 6, and at the same time, it is also prevented that the large particles of dust will cause impact force on the blades when passing through the fan, causing damage to the blades. After a long period of use, a large amount of dust will be attached to the filter 6, which will cause blockage. Once the blockage occurs, it will affect the air supply of the ventilation equipment to the working surface, so the filter 6 needs to be cleaned regularly. Based on this, the present invention first sets the outer wall of the fan cylinder 1 into a hollow double-layer structure, and a first annular rack 8 is rotatably installed in the interlayer of the fan cylinder 1. The inner side of the first annular rack 8 penetrates into the inside of the fan cylinder 1 and is integrally connected with a cleaning brush 9. The cleaning brush 9 is set through the center of the first annular rack 8, and the first annular rack 8 is driven to rotate, so that the cleaning brush 9 cleans the surface of the filter 6.

[0043] In the present invention, the filter screen 6 can be cleaned during the process of adjusting the air volume, so that the rotation of the cleaning brush 9 and the movement of the wind shield 26 share a set of driving systems. The specific design is as follows: two cover shells 4 are connected to the outer wall of the fan cylinder 1, and the first gear 7 and the second gear 10 are rotatably installed inside the two cover shells 4 respectively. The first gear 7 and the second gear 10 are connected by a shaft, and a protective seat 5 is fixedly connected to the position of the outer wall of the fan cylinder 1 corresponding to the shaft. The shaft is arranged inside the protective seat 5 and is rotatably connected thereto. A first motor 3 is also installed outside one of the cover shells 4. The first motor 3 drives the first gear 7 and the second gear 10 to rotate synchronously, wherein the first gear 7 is meshed with the first annular rack 8, so that the cleaning brush 9 can rotate to clean the filter 6, and the second annular rack 11 is rotatably installed at the front end of the windshield bracket 21 inside the fan cylinder 1. The installation method of the second annular rack 11 is consistent with the first annular rack 8. The second gear 10 is meshed with the second annular rack 11. A connecting plate 12 is fixed to the inner side of the second annular rack 11, and the connecting plate 12 also penetrates the second annular rack 11. The first circular plate 27 is provided with a second spiral groove 36, which extends from the outer side of the first circular plate 27 toward the center of the first circular plate 27 in a clockwise direction, and the rotation angle of the second spiral groove 36 is 360°. The surface of the connecting plate 12 is provided with a limit groove 13 that passes through the surface of the connecting plate 12, and a slider 15 is installed inside the limit groove 13 along its length direction. A screw rod 14 is installed inside the slider 15 along the width direction of the connecting plate 12, and the screw rod 14 can move along its axial direction to extend into the second spiral groove 36. The slider 15 is provided with a limit groove 13 that passes through the surface of the connecting plate 12. A nut block 16 is rotatably installed on the side away from the windshield bracket 21, and the nut block 16 is threadedly connected to the screw rod 14. A third gear 17 is fixedly sleeved on the outside of the nut block 16, and a second motor 19 is installed above the nut block 16. A fourth gear 18 meshing with the third gear 17 is fixedly sleeved on the motor shaft of the second motor 19. In this way, the fourth gear 18 is driven to rotate by the second motor 19, and the third gear 17 is meshed with the fourth gear 18 to drive the nut block 16 to rotate, and finally the screw rod 14 is driven to move upward along its own axis relative to the slider 15.

[0044] When the air volume needs to be adjusted, the second motor 19 is first started to drive the screw 14 to move toward the direction of the first circular plate 27 and extend into the second spiral groove 36. At this time, the screw 14 is just located at the starting end of the second spiral groove 36. The end of the slider 15 away from the center of the connecting plate 12 is connected to the spring 20, and the other end of the spring 20 is connected to the limiting groove 13. At this time, the spring 20 is in a free extension state. Then the first motor 3 is started to drive the first gear 7 and the second gear 10 to rotate synchronously. The cleaning brush 9 cleans the filter screen 6, and the connecting plate 12 drives the screw 14 to rotate clockwise inside the second spiral groove 36. Under the limiting action of the rotary groove 36, the slider 15 will gradually move toward the center of the connecting plate 12 inside the limiting groove 13. At this time, the spring 20 is gradually stretched. When the screw 14 rotates to its end inside the second spiral groove 36, the entire connecting plate 12 and the cleaning brush 9 just complete a 360° rotation. The cleaning brush 9 rotates 360° to clean the filter 6. When the screw 14 rotates to the end of the second spiral groove 36, the second motor 19 continues to drive the connecting plate 12 to rotate, which will drive the first circular plate 27 to rotate clockwise, and then drive the wind shield 26 to rotate, and finally realize the adjustment of the air volume (reducing the air volume). When the wind deflector 26 is rotated to a suitable angle according to actual needs, the second motor 19 is started to rotate in the opposite direction to drive the screw 14 to move out of the second spiral groove 36. At this time, the slider 15 slides to the initial position inside the limit groove 13 under the reaction of the spring 20. When the air volume is to be reduced next time, the screw 14 is driven by the second motor 19 again to extend into the starting end of the second spiral groove 36. In this way, before the next air volume adjustment, the cleaning brush 9 can be rotated 360° to clean the filter 6.

[0045] It should be noted that the slider 15 is reset under the action of the spring 20. If the slider 15 is connected to the inner wall of the limiting groove 13 only through the spring 20, the slider 15 will float during the reset process, and if the connecting plate 12 is rotated to a vertical state, the slider 15 will also have a tendency to move downward under the action of gravity. These will affect whether the screw 14 can be accurately inserted into the starting end of the second spiral groove 36. In order to avoid this situation, it is best to set a top column on the inner side of the spring 20 in this embodiment, one end of the top column is fixed on the inner wall of the limiting groove 13, and the other end directly contacts the slider 15, and the spring 20 is in a stretched state in the initial state. When the screw 14 disengages from the end of the second spiral groove 36, the slider 15 will directly reset to the initial state under the reaction of the spring 20, ensuring that it can be accurately inserted into the starting end of the second spiral groove 36 next time.

[0046] In the above scheme, each time when the air volume of the ventilation device is reduced, the cleaning brush 9 can be rotated 360° to clean the filter 6. However, when the air volume needs to be increased, if the screw 14 is inserted into the starting end of the second spiral groove 36 and drives it to rotate counterclockwise, the connecting plate 12 and the first circular plate 27 will rotate directly and synchronously. At this time, the rotation angle of the cleaning brush 9 depends entirely on the rotation angle of the wind shield plate 26. At this time, the rotation of the cleaning brush 9 cannot meet the cleaning of the filter 6. In order to be able to rotate the cleaning brush 9 360° in the opposite direction to clean the filter 6 when the air volume is increased, the present embodiment also has a connecting column 34 fixedly connected to the center of the first circular plate 27, and the connecting column 34 extends toward the center of the connecting plate 12 and penetrates to the other side thereof. A second circular plate 28 is fixedly connected to the rear side. The second circular plate 28 has the same specifications as the first circular plate 27. A first spiral groove 35 is provided on the plate surface of the second circular plate 28 facing the connecting plate 12. The first spiral groove 35 extends from the outer side of the second circular plate 28 toward the center of the second circular plate 28 in a counterclockwise direction. The rotation angle of the first spiral groove 35 is 360°. When it is necessary to increase the air volume of the fan, the second motor 19 is started to drive the screw 14 to move toward the direction of the first spiral groove 35 and extend into the starting end of the first spiral groove 35. Note that the length of the screw 14 is set to be less than the distance between the first circular plate 27 and the second circular plate 28 to ensure that the screw 14 can independently cooperate with the first circular plate 27 and the second circular plate 28 respectively. When the screw 14 extends into the starting end of the first spiral groove 35, the first motor 3 starts the connecting plate 12 to rotate counterclockwise. When the screw 14 slides to the end of the first spiral groove 35, the cleaning brush 9 rotates 360° to clean the filter 6. After the screw 14 slides to the end of the first spiral groove 35, as the connecting plate 12 rotates further, the connecting plate 12, the second circular plate 28 and the first circular plate 27 will rotate counterclockwise synchronously. The counterclockwise rotation of the first circular plate 27 will drive the windshield plate 26 to rotate counterclockwise, thereby increasing the air volume. When the windshield plate 26 rotates to the set angle, the second motor 19 drives the screw 14 to disengage from the first spiral groove 35, and the slider 15 is reset under the reaction of the spring 20. Through the above design, the present invention can make the cleaning brush 9 rotate 360° to clean the filter 6 before increasing or decreasing the air volume of the fan.

[0047] In the description of the present invention, the terms "first", "second", "another", and "yet another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0049] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A ventilation device for coal mines with adjustable air volume, comprising a fan cylinder (1) and two sets of fans installed inside the fan cylinder (1), wherein an air volume adjustment component is arranged at the air outlet end of the fan cylinder (1), and characterized in that: The air volume regulating component comprises a windshield support (21) fixed on the inner wall of the fan cylinder (1), the windshield support (21) is arranged in a cross shape as a whole for placing a windshield (26), four hinge shafts (23) are arranged in a ring shape near the center of the windshield support (21), each hinge shaft (23) is fixedly connected to the windshield support (21), and a plurality of windshields (26) are rotatably sleeved on the circumferential surface of each hinge shaft (23), and the plurality of windshields (26) are stacked in sequence along the axial direction of the hinge shaft (23), and a flexible polyester cloth (37) is connected between each two adjacent windshields (26), and the air volume of the fan is controlled by controlling the rotation angle of the outermost windshield (26) of each hinge shaft (23); An arc-shaped limit holder (22) adapted to the rotation track of the end of the wind deflector (26) is formed on the inner wall of the fan cylinder (1); A fifth gear (29) is rotatably mounted on the surface of all the outermost windshield plates (26), meshing teeth (24) meshing with the fifth gear (29) are distributed on the arc-shaped limit clamp (22), each hinge shaft (23) penetrates the windshield plate (26) and is rotatably sleeved with a sixth gear (30), a first circular plate (27) is rotatably mounted at the center of the windshield bracket (21), a third annular rack is fixedly sleeved on the periphery of the first circular plate (27), all the sixth gears (30) are meshed with the third annular rack, the end of the fifth gear (29) facing away from the windshield plate (26) is fixedly connected to the first sprocket (31), the end of each sixth gear (30) facing away from the windshield plate (26) is fixedly connected to the second sprocket (32), and a transmission connection is established between the first sprocket (31) and the second sprocket (32) via a sleeve chain (33); A filter screen (6) is provided at the air inlet end of the fan cylinder (1); The outer wall of the fan cylinder (1) is a hollow double-layer structure, a first annular rack (8) is rotatably mounted in the interlayer of the fan cylinder (1), the inner side of the first annular rack (8) penetrates into the interior of the fan cylinder (1) and is integrally connected with a cleaning brush (9), the cleaning brush (9) being arranged through the center of the first annular rack (8); A second annular rack (11) is rotatably mounted at the front end of the windshield bracket (21) inside the fan cylinder (1), and the second annular rack (11) can rotate synchronously with the first annular rack (8); A connecting plate (12) is fixed on the inner side of the second annular rack (11), and the connecting plate (12) is arranged to pass through the center of the second annular rack (11). A second spiral groove (36) is opened on the plate surface of the first circular plate (27), and the second spiral groove (36) extends from the outer side of the first circular plate (27) toward the center of the first circular plate (27) in a clockwise direction, and the rotation angle of the second spiral groove (36) is 360°; A limiting groove (13) penetrating the plate surface of the connecting plate (12) is provided, a slider (15) is installed inside the limiting groove (13) for sliding guidance along its length direction, a screw rod (14) is installed inside the slider (15) for sliding guidance along the width direction of the connecting plate (12), and the screw rod (14) can move along its axial direction to extend into the second spiral groove (36).

2. A ventilation device for coal mines with adjustable air volume according to claim 1, characterized in that: A guide block (25) is fixed on the side of each arc-shaped limit clamp (22) facing the fan, and the back-flow surface of the guide block (25) is respectively in contact with the inner wall of the fan cylinder (1) and the arc-shaped limit clamp (22), while the front-flow surface is in an inclined structure.

3. A ventilation device for coal mines with adjustable air volume according to claim 1, characterized in that: A connecting column (34) is fixedly connected to the center of the first circular plate (27). The connecting column (34) extends toward the center of the connecting plate (12) and penetrates through the other side thereof and is fixedly connected to the second circular plate (28). The second circular plate (28) and the first circular plate (27) have the same specifications. A first spiral groove (35) is provided on the plate surface of the second circular plate (28) on the side facing the connecting plate (12). The first spiral groove (35) extends from the outer side of the second circular plate (28) toward the center of the second circular plate (28) in a counterclockwise direction. The rotation angle of the first spiral groove (35) is 360°. The screw rod (14) can move along its axial direction and extend to the first spiral groove (35).

4. A ventilation device for coal mines with adjustable air volume according to claim 3, characterized in that: A nut block (16) is rotatably mounted on the side of the slider (15) facing away from the windshield bracket (21); the nut block (16) is threadedly connected to the screw rod (14); a third gear (17) is fixedly sleeved on the outside of the nut block (16); a second motor (19) is mounted above the nut block (16); a fourth gear (18) meshing with the third gear (17) is fixedly sleeved on the motor shaft of the second motor (19).

5. A ventilation device for coal mines with adjustable air volume according to claim 4, characterized in that: One end of the slider (15) away from the center of the connecting plate (12) is connected to a spring (20), and the other end of the spring (20) is connected to the limiting groove (13). A top column is arranged on the inner side of the spring (20), one end of the top column is fixed on the inner wall of the limiting groove (13), and the other end abuts against the slider (15), so that the spring (20) is in a stretched state in the initial state.

6. A ventilation device for coal mines with adjustable air volume according to claim 1, characterized in that: Two housings (4) are connected to the outer wall of the fan cylinder (1), and a first gear (7) and a second gear (10) are rotatably mounted inside the two housings (4), respectively. The first gear (7) and the second gear (10) are connected via a shaft, the first gear (7) is meshed with a first annular rack (8), and the second gear (10) is meshed with a second annular rack (11); A protective seat (5) is fixedly connected to the outer wall of the fan cylinder (1) at a position corresponding to the shaft, the shaft is arranged inside the protective seat (5) and is rotatably connected thereto, and a first motor (3) is also installed outside one of the covers (4).

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