Ventilation equipment for coal mine ground warehouse

Abstract

The invention belongs to the technical field of ventilation systems, particularly relates to ventilation equipment for a coal mine ground warehouse, and aims to solve the problem of low ventilation efficiency of a wall-mounted exhaust fan fixed in a storage room in the prior art. The two steel cable ropes are consistent in tightness degree and keep contracting and tightening at the same time during adjustment, four clamping wheels with grooves are slidably connected to the two steel cable ropes, hanging rods extending downwards are fixed to the ends of wheel shafts of the four clamping wheels with the grooves, and the same fan shell is fixed to the middles of the four hanging rods. An air inlet hole is reserved in the middle of the side face of the fan shell. The tensioning degree of the steel rope can be adjusted according to different heights of a coal pile during ventilation, then the air inlet of the device is made to be close to the surface of the coal pile as much as possible, and ventilation and heat dissipation can be better conducted.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation systems, and in particular to ventilation equipment used in ground warehouses of coal mines. Background Art

[0002] Coal is widely used as one of the important sources of energy in our lives. Most of the existing coal storage is open-air storage. The stored coal is exposed to the sun and rain. High-quality coal is easy to deteriorate and lose its high combustion value. Moreover, after being dried, the coal is easy to weather and blown everywhere with strong winds, polluting the environment. At the same time, due to the flammable nature of coal, if the coal is not stored and stacked correctly, the temperature inside the coal is easy to be too high, resulting in economic losses and even safety problems caused by coal combustion. As for the problem that coal is easy to freeze together due to low temperature and water vapor in winter, we use air film warehouse storage, which can play a good insulation effect. Only strong ventilation equipment needs to be set up in the hot summer to prevent accidents.

[0003] After searching, it is found that when the centrifugal fan is working, the motor drives the impeller to rotate in the casing, and the air is sucked in from the center of the impeller through the air intake port; then it is discharged from the exhaust port through the impeller suction. It has multiple advantages such as strong suction and little interference to the motor. It is often used in coal storage and factories with a lot of dust. Therefore, we need a new type of centrifugal fan to adapt to the application of ground coal storage. The traditional centrifugal fan is fixed on the side wall of the factory building. If it is to ventilate the coal pile, it needs a lot of power to act near the coal pile. The heat dissipation effect of this ventilation mechanism is not good, and safety hazards often occur due to untimely heat dissipation. Summary of the invention

[0004] In view of the technical problem of low ventilation efficiency of the wall-mounted exhaust fan fixed on the storage room in the prior art, the present invention adopts the following technical solution: A ventilation device for a coal mine ground warehouse, comprising two parallel steel cables fixed to a storage cabin near the cabin top, the two steel cables having the same degree of tightness and being simultaneously contracted and tightened during adjustment, four grooved clamping wheels being slidably connected to the two steel cables, the ends of the wheel shafts of the four grooved clamping wheels being fixed with hanging rods extending downward, and a same fan housing being fixed in the middle of the four hanging rods, an air inlet hole being reserved in the middle of the side of the fan housing; and a fan housing being fixed near the air inlet hole on the outer wall of the fan housing An L-shaped air inlet duct opens downward, a dustproof mesh plate is fixed at the air inlet of the L-shaped air inlet duct, and a flushing hose is inserted into the outer wall of the L-shaped air inlet duct above the dustproof mesh plate, and a permanent magnet is fixed to the circumferential outer wall of the bottom pipe opening of the flushing hose; a cleaning brush plate in contact with the lower surface of the dustproof mesh plate is provided on the lower surface of the dustproof mesh plate, and the bristles on the upper surface of the cleaning brush plate can move along the surface of the dustproof mesh plate on the lower surface of the dustproof mesh plate, and a magnet 2 attracted to the permanent magnet is provided in the middle of the upper surface of the cleaning brush plate.

[0005] Preferably, an axial hole is opened at the center of the back side of the fan housing, and a sealed bearing is embedded in the axial hole, a transmission shaft is rotatably connected in the sealed bearing, and the end of the transmission shaft is located inside the fan housing and a centrifugal impeller is fixed thereon; the centrifugal impeller comprises two coaxial and mutually parallel bottom plates and a connecting plate ring, and a plurality of worm gear grids symmetrically distributed in the center are fixed therebetween, a cleaning mechanism is fixed on one side of the bottom plate close to the worm gear grid and between two adjacent worm gear grids, and the cleaning mechanism comprises a spring stopper fixed to the surface of the bottom plate, a clamping spring is fixed on the side of the spring stopper close to the center of the bottom plate, and a scraper in contact with the surface of the worm gear grid is fixed at the end of the clamping spring.

[0006] Preferably, the end of the L-shaped air inlet duct away from the fan housing is arranged in a flat shape, and the plane where the bottom air inlet of the L-shaped air inlet duct is located is parallel to the horizontal plane; the middle part of the upper surface of the dustproof screen is arranged in an upward convex shape.

[0007] Preferably, a main motor is fixed on the back side of the fan housing near the top, and a driving pulley is fixed on the top of the output shaft of the main motor; a driven gear is fixed on the end of the transmission shaft away from the centrifugal impeller; an L-shaped bearing seat is fixed on the back side of the fan housing near the bottom of the driven gear, and a double-headed shaft is rotatably connected in the middle of the L-shaped bearing seat, and concentric gears and a reduction gear box are respectively fixed at both ends of the double-headed shaft; the concentric gears include a large gear meshing with the driven gear and a driven pulley forming a transmission connection with the driving pulley, and multiple strands of the transmission belt are wound between the outer walls of the driven pulley and the driving pulley.

[0008] Preferably, a shaft seat is fixed to the outer wall of the fan housing near the bottom end, and a transmission rod is rotatably connected to the middle of the shaft seat, and one end of the transmission rod is connected to the output shaft end of the reduction gear box through a coupling; a crankshaft is fixed to the end of the transmission rod away from the reduction gear box, and a connecting rod is rotatably sleeved on the journal of the crankshaft; a fixed plate seat is fixed to the front of the fan housing near the top of the crankshaft, and a horizontal piston barrel with an opening facing the center line of the crankshaft is fixed to the side of the fixed plate seat, and a sealing slide is slidably connected to the circumferential inner wall of the piston barrel, and a hinge seat is provided in the middle of the sealing slide, and the end of the connecting rod away from the crankshaft is rotatably connected to the hinge seat; a vertical one-way water outlet pipe is embedded in the circumferential outer wall of the piston barrel near the bottom of the barrel, and a pressure-resistant delivery pipe is connected between the outlet of the one-way water outlet pipe and the top of the flushing hose; a one-way water inlet valve is provided at the bottom of the barrel at the end of the piston barrel away from the barrel mouth, and the water inlet of the one-way water inlet valve is connected to the water inlet hose.

[0009] Preferably, a through rotating hole is opened on the front side of the fixed plate seat, and the inner wall of the rotating hole does not contact the rotating crankshaft; a V-shaped clamping frame is fixed to the inner wall of the rotating hole near the end of the crankshaft, and a stabilizing bearing with the same diameter as the crankshaft is embedded on the V-shaped clamping frame, which reinforces and stabilizes the rotation of the crankshaft.

[0010] Preferably, a transmission mechanism is fixed to the end of the crankshaft away from the reduction gear box, and the transmission mechanism includes a horizontal axis arranged on the fixed plate seat near the bottom end, and a rotating rod and a pulley one are respectively fixed to the front and rear ends of the horizontal axis; a pulley two is fixed to the end of the crankshaft away from the transmission rod, and a herringbone conveyor belt is wound between the circumferential outer walls of the pulley one and the pulley two; the cleaning brush plate is fixed to the end of the rotating rod away from the horizontal axis; the cleaning brush plate is arranged horizontally; an arc-shaped notch is opened on the lower surface of the dustproof mesh plate, and the center of the longitudinal section circle of the arc-shaped notch is on the axial centerline of the horizontal axis; through the arc-shaped notch, the rotating cleaning brush plate can periodically clean its surface.

[0011] Preferably, a sliding hole is opened at the end of the rotating rod away from the horizontal axis, and an inner sliding rod is slidably connected in the sliding hole, and a tension spring is fixed to the end of the inner sliding rod close to the horizontal axis; when in use, the faster the overall rotation speed of the cleaning brush plate, the tighter the contact between the bristles on its surface and the surface of the dustproof mesh plate.

[0012] Preferably, a clamp is fixed to the circumferential outer wall of the flushing hose near the bottom end, and the height of the clamp can be adjusted according to the adsorption strength, and then the attraction force is adjusted to change the swing amplitude of the nozzle.

[0013] Preferably, the one-way water outlet pipe is fixed to the circumferential outer wall of the piston barrel close to the lower surface.

[0014] The beneficial effects of the present invention are: 1. A fan casing suspended on two steel cables is provided, which can be tightened and tauted in cooperation with the steel cables themselves, so that the degree of tension of the steel cables can be adjusted according to the height of the coal pile during ventilation, and the air inlet of the device is made as close as possible to the surface of the coal pile, so that better ventilation and heat dissipation can be achieved. The cleaning brush plate provided can clean and remove dust from the lower surface of the dustproof screen at the air inlet, and the swinging flushing hose can prevent the opening of the dustproof screen from being blocked.

[0015] 2. Since a tightening spring and a scraper slidingly attached to the surface of the worm gear grid are provided, when the dust on the surface of the worm gear grid needs to be cleaned during use, it is only necessary to change the rotation speed of the centrifugal wheel. Under the action of different centrifugal forces, the position of the scraper is changed, thereby scraping the surface of the worm gear grid.

[0016] 3. Through the crankshaft and piston barrel, high-pressure water flushing can be performed when the fan is started. Not only can the places where the mesh may be blocked be backwashed in time, but the collision generated can also quickly atomize the water, and then the sucked dry coal ash can be moistened and dusted, and then the pollution can be reduced after discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the rear structure of the present invention; Figure 3 is a side view of the present invention; Figure 4 It is a front view of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure along the middle line AA; Figure 6 It is a schematic diagram of a half-section three-dimensional structure of a fan housing in the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the dustproof screen plate in the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the dust removal mechanism in the present invention; Fig. 9 It is a schematic diagram of the partial cross-sectional structure of the centrifugal impeller in the present invention.

[0018] In the figure: 1. fan housing; 101. L-shaped bearing seat; 102. transmission shaft; 103. shaft hole; 2. main motor; 3. driving pulley; 4. transmission belt; 5. concentric gear; 6. reduction gear box; 7. shaft rod seat; 8. piston barrel; 9. fixed plate seat; 901. rotating hole; 902. V-shaped abutment frame; 10. rotating rod; 1001. inner slide rod; 1002. tension spring; 11. cleaning brush plate; 12. dustproof screen plate; 121. arc notch ; 122. Magnet 2; 13. L-shaped air inlet pipe; 14. Flushing hose; 15. Pressure-resistant conveying pipe; 16. Hanging rod; 17. Grooved pulley; 18. Steel cable rope; 19. Herringbone conveyor belt; 20. Crankshaft; 21. Connecting rod; 22. One-way water outlet pipe; 23. Driven gear; 24. Horizontal axis; 25. Clamp; 26. Permanent magnet; 27. Centrifugal wheel; 271. Spring stopper; 272. Worm gear grid; 273. Clamping spring; 274. Scraper. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the present invention, reference is made to Figure 1-8A ventilation device for a coal mine ground warehouse comprises two parallel steel cables 18 fixed to a storage compartment near the compartment top, the two steel cables 18 have the same degree of tightness and are kept contracted and tightened at the same time when adjusted, four grooved pulleys 17 are slidably connected to the two steel cables 18, the ends of the wheel shafts of the four grooved pulleys 17 are all fixed with a downwardly extending suspension rod 16, and the middle of the four suspension rods 16 is fixed with a same fan housing 1, and the middle of the side of the fan housing 1 is pre- An air inlet hole is left; and an L-shaped air inlet pipe 13 with an opening downward is fixed near the air inlet hole on the outer wall of the fan housing 1, a dustproof screen 12 is fixed at the air inlet of the L-shaped air inlet pipe 13, and a flushing hose 14 is plugged into the outer wall of the L-shaped air inlet pipe 13 above the dustproof screen 12, and a permanent magnet 26 is fixed to the outer wall of the circumference of the bottom end of the flushing hose 14; a cleaning brush plate 11 in contact with the lower surface of the dustproof screen 12 is provided on the lower surface of the dustproof screen 12, and the upper surface of the cleaning brush plate 11 The bristles on the surface can move along the surface of the dustproof mesh plate 12 on the lower surface of the dustproof mesh plate 12, and a magnet 122 that attracts the permanent magnet 26 is provided in the middle of the upper surface of the cleaning brush plate 11; since the flushing hose 14 is a hose, in conjunction with the swinging cleaning brush plate 11 and the magnet 122 embedded in the cleaning brush plate 11, the flushing hose 14 with the permanent magnet 26 can be affected when sweeping over the top, that is, the flushing hose 14 is driven to swing; by setting a fan casing 1 suspended on two steel cables 18, the steel cables 18 themselves can be tightened and tightened, so that the tension of the steel cables 18 can be adjusted according to the height of the coal pile during ventilation, and then the air inlet of the device is made as close as possible to the surface of the coal pile, so that better ventilation and heat dissipation can be performed, and the cleaning brush plate 11 provided can clean and dust the lower surface of the dustproof mesh plate 12 at the air inlet, and the swinging flushing hose 14 can prevent the opening of the dustproof mesh plate 12 from being blocked.

[0021] In the present invention, an axial hole 103 is opened at the center of the back side of the fan housing 1, and a sealed bearing is embedded in the axial hole 103, a transmission shaft 102 is rotatably connected in the sealed bearing, and the end of the transmission shaft 102 is located inside the fan housing 1 and a centrifugal wheel 27 is fixed; the centrifugal wheel 27 includes two coaxial and mutually parallel bottom plates and connecting plate rings, and a plurality of worm wheel grid plates 272 are fixed between the bottom plates and the connecting plate rings and are symmetrically distributed in the center, and a dust cleaning mechanism is fixed on one side of the bottom plate close to the worm wheel grid plate 272 and between two adjacent worm wheel grid plates 272, and the dust cleaning mechanism includes a dust cleaning mechanism fixed on The spring stopper 271 on the surface of the bottom plate has a clamping spring 273 fixed to one side of the spring stopper 271 close to the center of the bottom plate, and a scraper 274 in contact with the surface of the worm gear grid 272 is fixed to the end of the clamping spring 273; since the clamping spring 273 and the scraper 274 slidingly fitted on the surface of the worm gear grid 272 are provided, when it is necessary to clean the dust on the surface of the worm gear grid 272 during use, it is only necessary to change the rotation speed of the centrifugal wheel 27, and the position of the scraper 274 will be changed under the action of different centrifugal forces, thereby scraping the surface of the worm gear grid 272.

[0022] Please refer to Figure 3 The end of the L-shaped air inlet pipe 13 away from the fan housing 1 is set to a flat shape, and the plane where the bottom air inlet of the L-shaped air inlet pipe 13 is located is parallel to the horizontal plane; the middle part of the upper surface of the dustproof mesh plate 12 is set to an upward convex shape, so that the high-pressure flushing water can be applied to a larger range of mesh holes as much as possible during flushing.

[0023] Please refer to Figure 2 A main motor 2 is fixed on the back side of the fan housing 1 near the top, and a driving pulley 3 is fixed on the top of the output shaft of the main motor 2; a driven gear 23 is fixed on the end of the transmission shaft 102 away from the centrifugal impeller 27; an L-shaped bearing seat 101 is fixed on the back side of the fan housing 1 near the bottom of the driven gear 23, and a double-headed shaft is rotatably connected in the middle of the L-shaped bearing seat 101, and a concentric gear 5 and a reduction gear box 6 are respectively fixed at both ends of the double-headed shaft; the concentric gear 5 includes a large gear 1 meshing with the driven gear 23 and a driven pulley forming a transmission connection with the driving pulley 3, and multiple transmission belts 4 are wound between the outer walls of the driven pulley and the driving pulley 3; the slipping property of the transmission belt 4 can protect the main motor 2 when in use.

[0024] Please refer to Figure 2-3A shaft seat 7 is fixed to the outer wall of the fan housing 1 near the bottom end, and a transmission rod is rotatably connected in the middle of the shaft seat 7, and one end of the transmission rod is connected to the output shaft end of the reduction gear box 6 through a coupling; a crankshaft 20 is fixed to the end of the transmission rod away from the reduction gear box 6, and a connecting rod 21 is rotatably sleeved on the journal of the crankshaft 20; a fixed plate seat 9 is fixed to the top of the front of the fan housing 1 near the crankshaft 20, and a horizontal piston barrel 8 with an opening facing the center line of the crankshaft 20 is fixed to the side of the fixed plate seat 9, and a sealing slide is slidably connected to the circumferential inner wall of the piston barrel 8, and a hinged seat is provided in the middle of the sealing slide, and the connecting rod 21 is away from the crankshaft 20. The end is rotatably connected to the hinge seat; a vertical one-way water outlet pipe 22 is embedded in the circumferential outer wall of the piston barrel 8 near the bottom of the barrel, and a pressure-resistant delivery pipe 15 is connected between the outlet of the one-way water outlet pipe 22 and the top of the flushing hose 14; a one-way water inlet valve is arranged at the bottom of the barrel at the end of the piston barrel 8 away from the barrel mouth, and the water inlet of the one-way water inlet valve is connected to the water inlet hose; through the arranged crankshaft 20 and the piston barrel 8, high-pressure water flushing can be performed when the fan is started, which can not only backwash the places where the mesh may be blocked in time, but also the collision generated can quickly atomize the water, and then the sucked dry coal ash will be humidified and dusted, and the pollution can be reduced after external discharge.

[0025] Please refer to Figure 8 A through-hole 901 is opened on the front of the fixed plate seat 9, and the inner wall of the hole 901 does not contact the rotating crankshaft 20; a V-shaped clamping frame 902 is fixed to the inner wall of the hole 901 near the end of the crankshaft 20, and a stabilizing bearing with the same diameter as the crankshaft 20 is embedded on the V-shaped clamping frame 902, which reinforces and stabilizes the rotation of the crankshaft 20.

[0026] Please refer to Figure 2 and Figure 8 A transmission mechanism is fixed to the end of the crankshaft 20 away from the reduction gear box 6, and the transmission mechanism includes a transverse axis 24 arranged on the fixed plate seat 9 near the bottom end, and a rotating rod 10 and a pulley 1 are fixed to the front and rear ends of the transverse axis 24 respectively; a pulley 2 is fixed to the end of the crankshaft 20 away from the transmission rod, and a herringbone conveyor belt 19 is wound between the circumferential outer walls of the pulleys 1 and 2; a cleaning brush plate 11 is fixed to the end of the rotating rod 10 away from the transverse axis 24; the cleaning brush plate 11 is arranged horizontally; an arc-shaped notch 121 is opened on the lower surface of the dustproof mesh plate 12, and the center of the longitudinal section circle of the arc-shaped notch 121 is on the axial center line of the transverse axis 24; through the arc-shaped notch 121, the rotating cleaning brush plate 11 can periodically clean its surface.

[0027] Please refer to Figure 4A sliding hole is opened at the end of the rotating rod 10 away from the horizontal axis 24, and an inner sliding rod 1001 is slidably connected in the sliding hole, and a tension spring 1002 is fixed to the end of the inner sliding rod 1001 close to the horizontal axis 24; when in use, the faster the overall rotation speed of the cleaning brush plate 11, the tighter the contact between the bristles on its surface and the surface of the dustproof mesh plate 12.

[0028] Please refer to Figure 5 A clamp 25 is fixed to the outer circumferential wall of the flushing hose 14 near the bottom end, and the height of the clamp 25 can be adjusted according to the adsorption strength, and then the attraction force is adjusted to change the swing amplitude of the nozzle.

[0029] Please refer to Figure 2 The one-way water outlet pipe 22 is fixed to the circumferential outer wall of the piston barrel 8 near the lower surface, which can ensure that no empty push occurs during each push, and then each push can spray out as much water as possible.

[0030] Working principle: When using the device, first adjust the tightness of the two steel cables 18 to be consistent, then clamp the four grooved clamping wheels 17 of the device on the two parallel steel cables 18, then move the device above the coal pile, and then adjust the tightness of the steel cables 18 according to the height of the coal pile until the device is within one meter of the top of the coal pile; at this time, the main motor 2 on the surface of the device can be started to exhaust air, and the hot air emitted from the coal pile will be quickly extracted and discharged; when the main motor 2 is started, the heat from the coal pile will be quickly extracted and discharged through the multi-strand transmission belt 4 The shaft at the input end of the reduction gearbox 6 is driven to rotate, and then the transmission rod after the speed reduction by the reduction gearbox 6 drives the crankshaft 20 at its shaft head end to rotate. While the crankshaft 20 rotates, the connecting rod 21 sleeved on its shaft neck rotates to realize the operation of the piston barrel 8, and then high-pressure water is introduced into the flushing hose 14 for backwashing operation; at the same time, the end of the crankshaft 20 away from the transmission rod drives the horizontal axis 24 to rotate through the herringbone conveyor belt 19, and then the cleaning brush plate 11 pressed against the surface of the dustproof mesh plate 12 is rotated to realize the cleaning of the surface of the dustproof mesh plate 12.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ventilation device for a coal mine ground warehouse, comprising two parallel steel cables (18) fixed to a storage compartment near the compartment top, characterized in that: The two steel cables (18) have the same degree of tightness and are kept contracted and tightened at the same time when adjusted. Four grooved clamping wheels (17) are slidably connected to the two steel cables (18). The ends of the wheel shafts of the four grooved clamping wheels (17) are fixed with downwardly extending suspension rods (16), and the same fan housing (1) is fixed in the middle of the four suspension rods (16). An air inlet hole is reserved in the middle of the side of the fan housing (1); and an L-shaped air inlet pipe (13) with an opening downward is fixed to the outer wall of the fan housing (1) near the air inlet hole, and a dustproof screen (1) is fixed at the air inlet of the L-shaped air inlet pipe (13). 2), and a flushing hose (14) is inserted into the outer wall of the L-shaped air inlet pipe (13) above the dustproof mesh plate (12), and a permanent magnet (26) is fixed to the circumferential outer wall of the bottom end of the flushing hose (14); a cleaning brush plate (11) in contact with the lower surface of the dustproof mesh plate (12) is provided on the lower surface of the dustproof mesh plate (12), and the bristles on the upper surface of the cleaning brush plate (11) can move along the lower surface of the dustproof mesh plate (12) and the surface of the dustproof mesh plate (12), and a second magnet (122) that attracts the permanent magnet (26) is provided in the middle of the upper surface of the cleaning brush plate (11).

2. A ventilation device for a coal mine ground warehouse according to claim 1, characterized in that: An axial hole (103) is provided at the center of the back side of the fan housing (1), and a sealed bearing is embedded in the axial hole (103), a transmission shaft (102) is rotatably connected to the sealed bearing, and the end of the transmission shaft (102) is located inside the fan housing (1) and a centrifugal wheel (27) is fixed thereto; the centrifugal wheel (27) comprises two coaxial and mutually parallel bottom plates and a connecting plate ring, and a plurality of worm wheel gratings (272) are fixed between the bottom plates and the connecting plate ring and are centrally symmetrically distributed; a dust cleaning mechanism is fixed on a side of the bottom plate close to the worm wheel grating (272) and between two adjacent worm wheel gratings (272), and the dust cleaning mechanism comprises a spring stopper (271) fixed to the surface of the bottom plate, a pressing spring (273) is fixed to a side of the spring stopper (271) close to the center of the bottom plate, and a scraper (274) in contact with the surface of the worm wheel grating (272) is fixed to the end of the pressing spring (273).

3. The ventilation equipment for coal mine ground warehouse according to claim 1, characterized in that: The end of the L-shaped air inlet pipe (13) away from the fan housing (1) is arranged in a flat shape, and the plane where the air inlet at the bottom end of the L-shaped air inlet pipe (13) is located is parallel to the horizontal plane; the middle part of the upper surface of the dustproof screen plate (12) is arranged in an upwardly convex shape.

4. The ventilation equipment for coal mine ground warehouse according to claim 1, characterized in that: A main motor (2) is fixed on the back side of the fan housing (1) near the top, and a driving pulley (3) is fixed on the top of the output shaft of the main motor (2); a driven gear (23) is fixed on the end of the transmission shaft (102) away from the centrifugal impeller (27); an L-shaped bearing seat (101) is fixed on the back side of the fan housing (1) near the bottom of the driven gear (23), and a double-headed shaft is rotatably connected in the middle of the L-shaped bearing seat (101), and a concentric gear (5) and a reduction gear box (6) are respectively fixed at both ends of the double-headed shaft; the concentric gear (5) includes a large gear meshing with the driven gear (23) and a driven pulley forming a transmission connection with the driving pulley (3), and a plurality of strands of the transmission belt (4) are wound between the outer walls of the driven pulley and the driving pulley (3).

5. The ventilation equipment for coal mine ground warehouse according to claim 4, characterized in that: A shaft seat (7) is fixed near the bottom end of the outer wall of the fan housing (1), and a transmission rod is rotatably connected in the middle of the shaft seat (7), and one end of the transmission rod is connected to the output shaft end of the reduction gear box (6) through a coupling; a crankshaft (20) is fixed at one end of the transmission rod away from the reduction gear box (6), and a connecting rod (21) is rotatably sleeved at the journal of the crankshaft (20); a fixed plate seat (9) is fixed on the front side of the fan housing (1) near the top of the crankshaft (20), and a horizontal opening with an opening facing the center line of the crankshaft (20) is fixed on the side of the fixed plate seat (9). A piston barrel (8) is provided, wherein the circumferential inner wall of the piston barrel (8) is slidably connected to a sealing slide plate, a hinge seat is provided in the middle of the sealing slide plate, and the end of the connecting rod (21) away from the crankshaft (20) is rotatably connected to the hinge seat; a vertical one-way water outlet pipe (22) is embedded in the circumferential outer wall of the piston barrel (8) near the barrel bottom, and a pressure-resistant delivery pipe (15) is connected between the outlet of the one-way water outlet pipe (22) and the top end of the flushing hose (14); a one-way water inlet valve is provided at the barrel bottom at the end of the piston barrel (8) away from the barrel mouth, and the water inlet of the one-way water inlet valve is connected to the water inlet hose.

6. A ventilation device for a coal mine ground warehouse according to claim 5, characterized in that: The front face of the fixed plate seat (9) is provided with a through-hole (901), the inner wall of the hole (901) not being in contact with the rotating crankshaft (20); a V-shaped abutment frame (902) is fixed to the inner wall of the hole (901) near the end of the crankshaft (20), and a stable bearing having the same diameter as the crankshaft (20) is embedded in the V-shaped abutment frame (902).

7. A ventilation device for a coal mine ground warehouse according to claim 6, characterized in that: A transmission mechanism is fixed to one end of the crankshaft (20) away from the reduction gearbox (6), and the transmission mechanism includes a transverse axis (24) arranged near the bottom end of the fixed plate seat (9), and a rotating rod (10) and a pulley 1 are respectively fixed to the front and rear ends of the transverse axis (24); a pulley 2 is fixed to one end of the crankshaft (20) away from the transmission rod, and a herringbone conveyor belt (19) is wound between the circumferential outer walls of the pulleys 1 and 2; the cleaning brush plate (11) is fixed to the end of the rotating rod (10) away from the transverse axis (24); the cleaning brush plate (11) is arranged horizontally; an arc-shaped notch (121) is opened on the lower surface of the dustproof screen plate (12), and the center of the longitudinal section circle of the arc-shaped notch (121) is on the axis line of the transverse axis (24).

8. The ventilation equipment for coal mine ground warehouse according to claim 7, characterized in that: A sliding hole is formed at one end of the rotating rod (10) away from the transverse axis (24), and an inner sliding rod (1001) is slidably connected in the sliding hole. A tension spring (1002) is fixed to one end of the inner sliding rod (1001) close to the transverse axis (24).

9. The ventilation equipment for coal mine ground warehouse according to claim 1, characterized in that: A clamp (25) is fixed to the circumferential outer wall of the flushing hose (14) near the bottom end, and the height of the clamp (25) can be adjusted according to the adsorption strength, thereby adjusting the attraction force.

10. The ventilation equipment for coal mine ground warehouse according to claim 5, characterized in that: The one-way water outlet pipe (22) is fixed to the circumferential outer wall of the piston barrel (8) near the lower surface.

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