Atomization dust suppression mechanism for limestone mine

By combining a rotating and lifting device with a ring-shaped water pipe design, the problem that existing limestone mine dust suppression devices cannot simultaneously achieve close-range and long-range spraying has been solved. This enables flexible angle adjustment and efficient dust suppression, adapts to different dust conditions, and reduces labor costs.

CN223497948UActive Publication Date: 2025-10-31BENXI IRON & STEEL (GRP) MINING CO LTD
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Patent Information

Application Number
CN202422247550.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-13
Publication Date
2025-10-31
Estimated Expiration
2034-09-13

AI Technical Summary

Technical Problem

Existing dust suppression devices in limestone mines cannot simultaneously achieve both near-distance and long-distance spraying, resulting in spraying dead zones and inflexible operation.

Method used

The device employs a combination of rotation and lifting mechanisms with annular water pipes. Gear meshing drives the dust removal cannon to rotate, while atomizing nozzles of different diameters in the inner and outer annular water pipes are controlled by solenoid valves to achieve both short-distance and long-distance spraying. The spraying range can be adjusted by using an extension hood.

Benefits of technology

It enables flexible angle adjustment of the dust suppression cannon, reduces spray dead zones, improves dust suppression effect, adapts to different dust conditions, reduces labor consumption, and improves operating efficiency.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223497948U_ABST
Patent Text Reader

Abstract

The utility model relates to a limestone mine atomization dust suppression mechanism which comprises a box body, two rotating shafts are rotatably connected to the top of the box body, gears are fixedly installed on the outer sides of the rotating shafts, and the two gears are meshed with each other. According to the atomization dust suppression mechanism for the limestone mine, the corresponding rotating shaft can be driven to rotate through the driving mechanism, then the rotating shaft drives one gear to rotate, one gear can drive the other gear to rotate through meshing connection between the two gears, and therefore dust suppression is achieved. One gear drives the corresponding rotating shaft to rotate, then the other gear drives the corresponding rotating shaft to rotate, the two fixing plates move in opposite directions, the fixing plates rotate to drive the dust removal gun barrel to rotate, then the dust removal gun barrel swings back and forth at a certain angle, the dust suppression effect is better, the dead angle is smaller, and the whole device is small, exquisite and flexible; and labor consumption can be reduced, and actual application and operation are facilitated.
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Description

Technical Field

[0001] This utility model relates to the technical field of atomizing dust suppression mechanisms, specifically to an atomizing dust suppression mechanism for limestone mines. Background Technology

[0002] Most of the dust generated from limestone mining is treated by water mist, such as spray cannons. Due to their small size, sturdy structure, and easy mobility, spray cannons are suitable for open-pit limestone mining.

[0003] Patent application number 2021224631970 discloses an intelligent water mist dust suppression device for open-pit limestone mines. The dust suppression device for open-pit limestone mines includes a box, a dust removal cannon, a positioning mechanism, and a lifting mechanism. Four fixing blocks are fixedly connected to the bottom of the box, and a handle is fixedly connected to the top of the box. The dust removal cannon is set above the box, and a hydraulic cylinder is set below the dust removal cannon. The positioning mechanism is set inside the box and includes a support rod and a positioning rod. The support rod is sleeved inside the box, and the positioning rod is fixedly connected to the bottom of the support rod. The lifting mechanism is set at the connection between the box and the support rod.

[0004] However, in actual use, the device has a hydraulic cylinder installed below the dust removal cannon. The hydraulic cylinder is electrically connected to the power supply via an external switch. The spray range is determined by adjusting the height of the dust removal cannon's outlet using the hydraulic cylinder, making it impossible to achieve both short-range and long-range spraying simultaneously. The housing contains a motor, which is a fixed structure. The motor is electrically connected to the power supply via an external switch, and a linkage rod is fixedly connected to the motor's output end. The motor drives the linkage rod to rotate, which in turn drives the dust removal cannon to rotate, thus creating a spray dead zone. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a limestone mine atomizing dust suppression mechanism that can achieve simultaneous spraying at close and long distances, prevent spraying dead zones, and improve spraying effect.

[0006] The technical solution adopted by this utility model is:

[0007] A limestone mine atomizing dust suppression mechanism includes a housing, a rotating device and a lifting device on the top of the housing, a dust suppression cannon mounted on the rotating device, a water tank inside the housing, and two sets of annular water pipes on the dust suppression cannon. Atomizing nozzles are fixedly connected at equal intervals to the outer sides of the annular water pipes. The annular water pipes include an inner annular water pipe and an outer annular water pipe. The water tank is connected to a main pipeline, and a water pump is mounted on the main pipeline. The water pump is connected to the annular water pipes 9 through a three-way solenoid valve. The nozzle diameter of the inner annular water pipe is smaller than that of the outer annular water pipe.

[0008] Preferably, the rotating device includes two rotating shafts disposed on the top of the housing, gears are respectively installed on the outer side of the rotating shafts, the two gears mesh with each other, a fixed plate is fixedly connected to the top of the rotating shafts, a U-shaped plate is disposed on the top of the fixed plate, and a dust removal cannon is rotatably connected to the top of the inner wall of the U-shaped plate.

[0009] A lifting device is provided on one side of the top of the fixed plate;

[0010] The lifting device is an electric telescopic rod, and the piston rod of the electric telescopic rod is rotatably connected to one end of the dust removal barrel;

[0011] A support rod is provided at one end of the dust removal barrel;

[0012] An annular water pipe is connected to the outside of the support rod;

[0013] The rotating device is connected to the drive mechanism.

[0014] Preferably, the drive mechanism includes a driven wheel, a motor, a driving wheel, and a belt. The motor is fixedly connected to the top of the water tank, the driving wheel is fixedly installed on the output end of the motor, the driven wheel is fixedly installed on the outside of one of the rotating shafts and located between the fixed plate and the gear, and the driving wheel and the driven wheel are connected by belt drive.

[0015] Preferably, a filter screen is fixedly connected to the interior of the dust removal barrel at the end away from the annular water pipe.

[0016] Preferably, a fixed frame is fixedly connected to the end of the air duct away from the filter screen, and a fan is installed on the fixed frame.

[0017] Preferably, two water pumps are provided on the top of the water tank and on one side of the gear, the input ends of the water pumps extend into the interior of the water tank, and the output ends of the water pumps are connected to the main pipeline.

[0018] Preferably, support plates are fixedly connected to both sides of the top end of the box, and a handle is fixedly connected between one side of the two support plates.

[0019] Preferably, the dust removal cannon is provided with an expansion cover at the front end; the rear end of the expansion cover is cylindrical and is fitted onto the dust removal cannon body; the front end of the expansion cover is trumpet-shaped with an outer diameter larger than the inner diameter; mounting holes are provided along the axial direction on the surface of the dust removal cannon; a rectangular connecting hole is provided at the rear end of the expansion cover; the expansion cover is connected to the dust removal cannon body by bolts.

[0020] A limestone mine atomizing dust suppression mechanism includes a housing, a rotating device and a lifting device on the top of the housing, a dust suppression cannon mounted on the rotating device, a water tank inside the housing, and two sets of annular water pipes on the dust suppression cannon. Atomizing nozzles are fixedly connected at equal intervals to the outer sides of the annular water pipes. The annular water pipes include an inner annular water pipe and an outer annular water pipe. The inner annular water pipe is connected to the water tank through a first main pipe and a first water pump. The outer annular water pipe is connected to the water tank through a second main pipe and a second water pump. The nozzle diameter of the inner annular water pipe is smaller than that of the outer annular water pipe.

[0021] Preferably, the nozzles of the inner annular water pipe and the nozzles of the outer annular water pipe are staggered along the circumferential direction.

[0022] The advantages of this utility model over the prior art are:

[0023] This utility model discloses a limestone mine atomizing dust suppression mechanism. A drive mechanism rotates a corresponding shaft, which in turn rotates a gear. The meshing of two gears allows one gear to drive the other, which in turn rotates the shaft. This causes two fixed plates to move in opposite directions. The rotation of the fixed plates rotates the dust suppression cannon. When the tilt angle of the dust suppression cannon needs adjustment, the electric telescopic rod is used to rotate the cannon. In practical use, the meshing of the two sets of gears allows the dust suppression cannon to swing back and forth within a certain angle, resulting in better dust suppression and smaller blind spots. The device is compact and flexible, reduces manual labor, and is beneficial for practical application and operation.

[0024] This utility model discloses a limestone mine atomizing dust suppression mechanism. It uses a solenoid valve to connect the main pipeline with the inner and outer annular water pipes. When the main pipeline is connected to the inner annular water pipe, the diameter of the atomizing nozzle in the inner annular water pipe is small, and the water pressure is high, achieving long-distance spraying. When the main pipeline is connected to the outer annular water pipe, the diameter of the atomizing nozzle in the outer annular water pipe is large, and the water pressure is low, achieving short-distance spraying.

[0025] This utility model discloses a limestone mine atomizing dust suppression mechanism, which is equipped with an expansion hood. By adjusting the axial position of the expansion hood relative to the dust suppression cannon, the size of the opening of the dust suppression cannon can be changed, thereby adjusting the spray range, making it more suitable for the needs of on-site work and improving the dust suppression effect. At the same time, it is more convenient to replace and maintain the atomizing nozzles, improving on-site maintenance efficiency.

[0026] This utility model discloses a limestone mine atomizing dust suppression mechanism. The inner annular water pipe is connected to the water tank through a first main pipe and a first water pump; the outer annular water pipe is connected to the water tank through a second main pipe and a second water pump. It can activate short-range or long-range spraying according to the weather and the degree of dust generated by the limestone mine. If the dust on site is particularly severe, the first water pump and the second water pump can be activated simultaneously to achieve both short-range and long-range spraying.

[0027] This utility model discloses a limestone mine atomizing dust suppression mechanism. The nozzles of the inner annular water pipe and the outer annular water pipe are staggered along the circumference. When the nozzles of the inner and outer annular water pipes spray water simultaneously, a water mist vortex is formed inside the expansion hood, which improves the dust suppression effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a limestone mine atomizing dust suppression mechanism according to the present invention;

[0029] Figure 2 This is a schematic diagram of the connection structure between the dust suppression cannon and the rotating device of a limestone mine atomizing dust suppression mechanism without the expansion cover.

[0030] Figure 3 This is a schematic diagram of a limestone mine atomizing dust suppression mechanism according to the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of a limestone mine atomizing dust suppression mechanism according to the present invention;

[0032] Figure 5 This is a schematic diagram of the inner annular water pipe, outer annular water pipe, and atomizing nozzle structure of a limestone mine atomizing dust suppression mechanism according to the present invention.

[0033] Figure 6 This is a schematic diagram of the structure of the expansion cover of the limestone mine atomizing dust suppression mechanism of this utility model;

[0034] Figure 7 This utility model provides a schematic diagram of the structure in which a water pump of a limestone mine atomizing dust suppression mechanism is connected to a ring-shaped water pipe via a three-way solenoid valve.

[0035] Figure 8 This is a schematic diagram of the structure of a limestone mine atomizing dust suppression mechanism where the water pump is directly connected to a ring-shaped water pipe.

[0036] Explanation of symbols for key components in the attached diagram:

[0037] In the picture:

[0038] 1. Housing; 2. Shaft; 3. Gear; 4. Fixing plate; 5. U-shaped plate; 6. Dust removal cannon; 7. Filter screen; 8. Support rod; 9. Annular water pipe; 10. Atomizing nozzle; 11. Driven wheel; 12. Motor; 13. Drive wheel; 14. Belt; 15. Water pump; 16. Main pipe; 17. Fixing frame; 18. Fan; 19. Support plate; 20. Handle; 21. Electric telescopic rod; 22. Mounting hole; 23. Rectangular connecting hole; 24. Expansion cover; 25. Three-way solenoid valve; 151. First water pump; 152. Second water pump; 161. First main pipe; 162. Second main pipe. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0040] Appendix Figure 1-8 It is known that a limestone mine atomizing dust suppression mechanism includes a housing 1, a rotating device and a lifting device are provided on the top of the housing, a dust removal cannon is provided on the rotating device, a water tank is provided inside the housing, and the dust removal cannon is provided with two sets of annular water pipes 9. Atomizing nozzles 10 are fixedly connected at equal intervals on the outer side of the annular water pipes 9. The annular water pipes 9 include an inner annular water pipe 91 and an outer annular water pipe 92. The water tank is connected to a main pipeline, and a water pump 15 is provided on the main pipeline. The water pump is connected to the annular water pipes 9 through a three-way solenoid valve 25. The diameter of the nozzle 10 of the inner annular water pipe 9 is smaller than the diameter of the nozzle 10 of the outer annular water pipe 9.

[0041] In this embodiment, the drive mechanism can drive the corresponding rotating shaft 2 to rotate, which in turn drives one of the gears 3 to rotate. Through the meshing connection between the two gears 3, one gear 3 can drive the other gear 3 to rotate, which in turn drives the corresponding rotating shaft 2 to rotate. This causes the two fixed plates 4 to move in opposite directions. The rotation of the fixed plates 4 can drive the dust removal cannon 6 to rotate, which in turn causes the dust removal cannon 6 to swing back and forth at a certain angle. When it is necessary to adjust the tilt angle of the dust removal cannon 6, the operation of the electric telescopic rod 21 can be used to drive the dust removal cannon 6 to rotate. In actual use, the meshing connection between the two sets of gears 3 can make the dust removal cannon 6 swing back and forth at a certain angle, thereby improving the dust suppression effect and reducing the dead angle. The device is not only compact and flexible, but also reduces manual labor, which is beneficial to practical application and operation.

[0042] Preferably, the rotating device includes two rotating shafts 2 set on the top of the box, gears 3 are respectively installed on the outer side of the rotating shafts 2, the two gears 3 mesh with each other, a fixing plate 4 is fixedly connected to the top of the rotating shafts 2, a U-shaped plate 5 is set on the top of the fixing plate 4, and a dust removal cannon 6 is rotatably connected to the top of the inner wall of the U-shaped plate 5.

[0043] A lifting device is provided on one side of the top of the fixed plate 4;

[0044] The lifting device is an electric telescopic rod 21, and the piston rod of the electric telescopic rod 21 is rotatably connected to one end of the dust removal cannon 6;

[0045] A support rod 8 is provided at one end of the dust removal barrel 6;

[0046] The outer side of the support rod 8 is connected to an annular water pipe 9;

[0047] The rotating device is connected to the drive mechanism.

[0048] Preferably, the drive mechanism includes a driven wheel 11, a motor 12, a drive wheel 13, and a belt 14. The motor 12 is fixedly connected to the top of the water tank. The drive wheel 13 is fixedly installed on the output end of the motor 12. The driven wheel 11 is fixedly installed on the outside of one of the rotating shafts 2 and located between the fixed plate 4 and the gear 3. The drive wheel 13 and the driven wheel 11 are connected by a belt 14.

[0049] Preferably, a filter screen 7 is fixedly connected to the interior of the dust removal barrel 6 at the end away from the annular water pipe 9.

[0050] Preferably, a fixing frame 17 is fixedly connected to the end of the dust removal barrel 6 away from the filter screen 7, and a fan 18 is provided on the fixing frame 17.

[0051] Preferably, two water pumps 15 are provided on the top of the water tank and on one side of the gear 3. The input ends of the water pumps 15 extend into the interior of the water tank, and the output ends of the water pumps 15 are connected to the main pipe 16.

[0052] Preferably, support plates 19 are fixedly connected to both sides of the top end of the box body 1, and a handle 20 is fixedly connected between one side of the two support plates 19.

[0053] Preferably, the dust removal cannon is provided with an expansion cover at the front end; the rear end of the expansion cover is cylindrical and is fitted onto the dust removal cannon body; the front end of the expansion cover is trumpet-shaped with an outer diameter larger than the inner diameter; mounting holes are provided along the axial direction on the surface of the dust removal cannon; a rectangular connecting hole is provided at the rear end of the expansion cover; the expansion cover is connected to the dust removal cannon body by bolts.

[0054] A limestone mine atomizing dust suppression mechanism includes a housing 1, with a rotating device and a lifting device installed on top of the housing. A dust suppression cannon is installed on the rotating device, and a water tank is installed inside the housing. The dust suppression cannon is equipped with two sets of annular water pipes 9, and atomizing nozzles 10 are fixedly connected at equal intervals to the outer side of the annular water pipes 9. The annular water pipes 9 include an inner annular water pipe and an outer annular water pipe. The inner annular water pipe is connected to the water tank through a first main pipe and a first water pump. The outer annular water pipe is connected to the water tank through a second main pipe and a second water pump. The diameter of the nozzle 10 in the inner annular water pipe is smaller than the diameter of the nozzle 10 in the outer annular water pipe.

[0055] Preferably, the nozzles of the inner annular water pipe and the nozzles of the outer annular water pipe are staggered along the circumferential direction.

[0056] Reference Figure 1 , Figure 2 and Figure 3 In a preferred embodiment, the drive mechanism includes a driven wheel 11, a motor 12, a drive wheel 13, and a belt 14. The motor 12 is fixedly connected to the top of the water tank 1. The drive wheel 13 is fixedly installed on the output end of the motor 12. The driven wheel 11 is fixedly installed on the outside of one of the rotating shafts 2 and located between the fixed plate 4 and the gear 3. The drive wheel 13 and the driven wheel 11 are connected by a belt 14.

[0057] In a preferred embodiment, two water pumps 15 are provided on the top of the housing 1 and on one side of the gear 3. The input ends of the water pumps 15 extend into the interior of the water tank 1, and the output ends of the water pumps 15 are fixedly connected to a main pipe 16. The end of the main pipe 16 away from the water pumps 15 is connected to the outside of the annular water pipe 9.

[0058] like Figure 3 As shown, the dust removal cannon 6 is equipped with an outer cover, and at the same time... Figure 4 As shown, each dust removal cannon 6 can also be equipped with two sets of annular water pipes 9, including an inner annular water pipe and an outer annular water pipe; atomizing nozzles 10 are fixedly connected at equal intervals on the outer side of the annular water pipes 9; at the same time, the atomizing nozzles 10 on the two sets of annular water pipes 9 are set with different diameters; the main pipe 16 is connected to the annular water pipes 9 through a solenoid valve; by controlling the solenoid valve, the main pipe 16 is connected to the two sets of annular water pipes 9 to achieve close-range spraying or long-range spraying.

[0059] Working principle: During use, the motor 12 drives the drive wheel 13 to rotate, and the belt 14 drives the driven wheel 11 to rotate, which in turn drives the shaft 2. The shaft 2 then drives one of the gears 3 to rotate. Through the meshing connection between the two gears 3, one gear 3 drives the other gear 3 to rotate, which in turn drives the corresponding shaft 2 to rotate. This causes the two fixed plates 4 to move in opposite directions. The rotation of the fixed plates 4 drives the dust removal cannon 6 to rotate. When it is necessary to adjust the tilt angle of the dust removal cannon 6, the electric telescopic rod 21 is used to drive the dust removal cannon 6 to rotate. In actual use, the meshing connection between the two sets of gears 3 allows the dust removal cannon 6 to swing back and forth within a certain angle, thereby improving the dust suppression effect and reducing dead angles. The device is not only compact and flexible, but also reduces manual labor, which is beneficial for practical application and operation.

[0060] This utility model discloses a limestone mine atomizing dust suppression mechanism. It uses a solenoid valve to connect the main pipeline with the inner and outer annular water pipes. When the main pipeline is connected to the inner annular water pipe, the diameter of the atomizing nozzle in the inner annular water pipe is small, and the water pressure is high, achieving long-distance spraying. When the main pipeline is connected to the outer annular water pipe, the diameter of the atomizing nozzle in the outer annular water pipe is large, and the water pressure is low, achieving short-distance spraying.

[0061] This utility model discloses a limestone mine atomizing dust suppression mechanism, which is equipped with an expansion hood. By adjusting the axial position of the expansion hood relative to the dust suppression cannon, the size of the opening of the dust suppression cannon can be changed, thereby adjusting the spray range, making it more suitable for the needs of on-site work and improving the dust suppression effect. At the same time, it is more convenient to replace and maintain the atomizing nozzles, improving on-site maintenance efficiency.

[0062] This utility model discloses a dust suppression atomizing mechanism for limestone mines. The inner annular water pipe is connected to a water tank via a first main pipe and a first water pump. The outer annular water pipe is connected to the water tank via a second main pipe and a second water pump. It can activate short-range or long-range spraying according to the weather and the degree of dust generated in the limestone mine. If the dust on site is particularly severe, the first and second water pumps can be activated simultaneously to achieve both short-range and long-range spraying, thereby improving the dust suppression range and effect.

[0063] This utility model discloses a limestone mine atomizing dust suppression mechanism. The nozzles of the inner annular water pipe and the outer annular water pipe are staggered along the circumference. When the nozzles of the inner and outer annular water pipes spray water simultaneously, a water mist vortex is formed inside the expansion hood, which improves the dust suppression effect.

[0064] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the structure of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A dust suppression atomizing mechanism for limestone mines, comprising a housing (1), a rotating device and a lifting device arranged on the top of the housing, a dust suppression cannon mounted on the rotating device, and a water tank arranged inside the housing, characterized in that, The dust removal cannon is equipped with two sets of annular water pipes (9), and atomizing nozzles (10) are fixedly connected at equal intervals on the outer side of the annular water pipes (9); the annular water pipes (9) include an inner annular water pipe (91) and an outer annular water pipe (92); the water tank is connected to the main pipeline, and a water pump is installed on the main pipeline. The water pump is connected to the annular water pipes (9) through a three-way solenoid valve; the diameter of the nozzle (10) of the inner annular water pipe (91) is smaller than the diameter of the nozzle (10) of the outer annular water pipe (92).

2. The limestone mine atomizing dust suppression mechanism according to claim 1, characterized in that, The rotating device includes two rotating shafts (2) set on the top of the box. Gears (3) are respectively installed on the outer side of the rotating shafts (2). The two gears (3) mesh with each other. A fixing plate (4) is fixedly connected to the top of the rotating shafts (2). A U-shaped plate (5) is set on the top of the fixing plate (4). A dust removal cannon (6) is rotatably connected to the top of the inner wall of the U-shaped plate (5). A lifting device is provided on one side of the top of the fixed plate (4); The lifting device is an electric telescopic rod (21), and the piston rod of the electric telescopic rod (21) is rotatably connected to one end of the dust removal barrel (6); A support rod (8) is provided at one end of the dust removal barrel (6); The outer side of the support rod (8) is connected to an annular water pipe (9); The rotating device is connected to the drive mechanism.

3. The limestone mine atomizing dust suppression mechanism according to claim 2, characterized in that, The drive mechanism includes a driven wheel (11), a motor (12), a drive wheel (13), and a belt (14). The motor (12) is fixedly connected to the top of the water tank. The drive wheel (13) is fixedly installed on the output end of the motor (12). The driven wheel (11) is fixedly installed on the outside of one of the rotating shafts (2) and located between the fixed plate (4) and the gear (3). The drive wheel (13) and the driven wheel (11) are connected by a belt (14).

4. The limestone mine atomizing dust suppression mechanism according to claim 3, characterized in that, The dust removal barrel (6) has a filter screen (7) fixedly connected to the end away from the annular water pipe (9).

5. A limestone mine atomizing dust suppression mechanism according to claim 4, characterized in that, The dust removal barrel (6) is fixedly connected to a fixed frame (17) at the end away from the filter screen (7), and a fan (18) is installed on the fixed frame (17).

6. A limestone mine atomizing dust suppression mechanism according to claim 5, characterized in that, Two water pumps (15) are provided on the top of the water tank and on one side of the gear (3). The input ends of the water pumps (15) extend into the interior of the water tank, and the output ends of the water pumps (15) are connected to the main pipe (16).

7. A limestone mine atomizing dust suppression mechanism according to claim 6, characterized in that, The top of the box (1) is fixedly connected to both sides of a support plate (19), and a handle (20) is fixedly connected between one side of the two support plates (19).

8. A limestone mine atomizing dust suppression mechanism according to claim 7, characterized in that, An expansion cover is provided at the front end of the dust removal cannon; the rear end of the expansion cover is cylindrical and is fitted onto the dust removal cannon body; the front end of the expansion cover is trumpet-shaped with an outer diameter larger than the inner diameter; mounting holes are provided along the axial direction on the surface of the dust removal cannon; a rectangular connection hole is provided at the rear end of the expansion cover; the expansion cover is connected to the dust removal cannon body by bolts.

9. A dust suppression atomizing mechanism for limestone mines, comprising a housing (1), a rotating device and a lifting device arranged above the housing, a dust removal cannon mounted on the rotating device, and a water tank arranged inside the housing, characterized in that, The dust removal cannon is equipped with two sets of annular water pipes (9), and atomizing nozzles (10) are fixedly connected at equal intervals on the outer side of the annular water pipes (9); the annular water pipes (9) include an inner annular water pipe and an outer annular water pipe; the inner annular water pipe is connected to the water tank through the first main pipe and the first water pump; the outer annular water pipe is connected to the water tank through the second main pipe and the second water pump; the diameter of the nozzle (10) of the inner annular water pipe is smaller than the diameter of the nozzle (10) of the outer annular water pipe.

10. A limestone mine atomizing dust suppression mechanism according to claim 9, characterized in that, The nozzles of the inner annular water pipe and the nozzles of the outer annular water pipe are staggered along the circumference.