Dust fall device for mining working face

Abstract

The invention relates to the technical field of mining dust suppression, and discloses a dust suppression device for a mining working face, which comprises a heading machine body, a rocker arm and a cutting head rotationally connected through a rotating shaft, and further comprises a supply source combined box body, a foam generating mechanism and a foam output mechanism, a nanoscale honeycomb net is installed at the end, close to the cutting head, of the conical output cover, foam in the conical output cover can be obliquely sprayed through the nanoscale honeycomb net, and an annular foam dust falling area wrapping the cutting head is formed. The technical means that the foam generating mechanism and the foam output mechanism are matched is adopted, high-pressure foam is generated through the foam generating mechanism, and after the high-pressure foam enters the conical output cover, a large amount of micron-scale and nano-scale foam is sprayed out through height division of the nano-scale honeycomb net, so that an annular foam dust falling area wrapping the cutting head is formed; therefore, dust is effectively prevented from escaping to the outside.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mining dust fall, more specifically, it relates to a dust fall device for mining working face. BACKGROUND

[0002] In the whole cycle of coal mining, dust release is significant at each stage. Although the intelligentization of mining improves efficiency and output, it exacerbates the dust problem, endangers work safety and health, and even causes pneumoconiosis and explosion risk. Existing coal dust control technologies, such as ventilation, spraying, water curtain, dust collector and foam dust fall, all have limitations, such as difficult to eliminate root cause by ventilation, large water consumption by spraying, unstable water curtain, harsh conditions for dust collector, and obstructed vision by foam dust fall. However, foam dust fall technology has irreplaceable advantages in mining working face due to its unique mechanism, especially for high concentration and fine particle size coal dust control.

[0003] For example, the patent number "CN118481631B" discloses "a dust collection and reduction system for fully mechanized mining working face, including a cutting head and a roadheader main body, the cutting head rear end is fixedly connected with a cutting head shaft, the roadheader main body front end is provided with a spraying device, the roadheader main body lower side is provided with a conveying device……", the patent forms a cover-shaped foam dust fall area in front of the cutting head of the roadheader, and forms a curtain-shaped dust fall area at the coal block conveying port, which reduces the harmful dust generated in the process of coal mining.

[0004] However, in the process of forming a cover-shaped foam dust fall area in front of the cutting head of the above-mentioned dust collection and reduction system for fully mechanized mining working face, the direction of dust generated by the cutting head rotating through the shaft to realize coal rock cutting is not single, and as the cutting head rotates and cuts, the dust will spread omnidirectionally to the outer periphery of the cutting head. The cover-shaped foam dust fall area formed in front of the cutting head will have a dust fall blind area, resulting in escape of part of the dust. SUMMARY

[0005] The present application provides a dust fall device for mining working face, which solves the technical problem that the cover-shaped foam dust fall area formed in front of the cutting head in the related art has a dust fall blind area, resulting in escape of part of the dust.

[0006] The present application provides a dust fall device for mining working face, which includes a roadheader main body, a rocker arm and a cutting head connected by a shaft, and further includes:

[0007] A supply source combination box is arranged outside the roadheader main body;

[0008] A foam generating mechanism is arranged outside the rocker arm and connected with the supply source combination box;

[0009] The foam output mechanism is arranged outside the rocker arm and connected with the foam generating mechanism, and comprises a conical output cover fixedly sleeved outside the rotating shaft, a nanometer honeycomb net is arranged at one end of the conical output cover close to the cutting head, and the foam inside the conical output cover can be obliquely sprayed through the nanometer honeycomb net and form an annular foam dust falling area wrapping the cutting head, and an adjusting member for adjusting the thickness of the foam spray is arranged inside the conical output cover.

[0010] The annular foam dust falling area wrapping the cutting head can effectively prevent dust from escaping to the outside.

[0011] Preferably, the supply combination box comprises a water storage tank, a foaming liquid storage tank and a compressed gas storage tank fixedly connected outside the machine body of the tunneling machine, and mine rubber hoses are fixedly connected outside the water storage tank, the foaming liquid storage tank and the compressed gas storage tank.

[0012] Preferably, the foam generating mechanism is arranged outside the rocker arm through a support, and comprises an explosion-proof water valve, a jet device and a spiral device fixedly connected outside the support.

[0013] Preferably, the water inlet end of the explosion-proof water valve is connected with the mine rubber hose outside the water storage tank, and the water outlet end of the explosion-proof water valve is connected with the jet device.

[0014] Preferably, the jet device comprises a front mixing pipe and a rear diffusion pipe fixedly and communicatively connected with each other, the inside of the front mixing pipe is provided with a jet nozzle in communication with the water outlet end of the explosion-proof water valve, the jet nozzle and the inside space of the front mixing pipe form a suction chamber, the outside of the front mixing pipe is provided with a liquid suction pipe and an air suction pipe in communication with the suction chamber, the liquid suction pipe is connected with the mine rubber hose outside the foaming liquid storage tank, and the air suction pipe is connected with the mine rubber hose outside the compressed gas storage tank.

[0015] Preferably, the spiral device comprises a foam cylinder body in communication with the rear diffusion pipe, the inside of the foam cylinder body is provided with a spiral blade extending in the axial direction, and the inside of the foam cylinder body is further provided with a foaming net away from the rear diffusion pipe.

[0016] Preferably, the conical output cover is communicated with two U-shaped distribution bins bypassing the rocker arm at one end away from the cutting head, and the two U-shaped distribution bins are commonly communicated with a foam elbow pipe connected with the foam cylinder body at one end away from the conical output cover.

[0017] Preferably, the conical output cover is composed of a ring-shaped plate, an inner cylinder cover and an outer conical cover, one side of the ring-shaped plate is fixedly connected with the U-shaped distribution bin, and the other side of the ring-shaped plate is fixedly connected with the inner cylinder cover and the outer conical cover.

[0018] Preferably, the adjusting piece comprises a moving sleeve slidingly connected outside the inner cylinder cover, an outer conical surface of the moving sleeve is consistent with the inclination of the outer conical cover, two connecting rods are symmetrically and fixedly connected to one end of the moving sleeve close to the annular plate, both the connecting rods pass through the annular plate and are jointly and fixedly connected with a connecting plate, a through hole is formed in the middle of the connecting plate, a threaded sleeve is rotationally connected to the outside of the through hole of the connecting plate, and a threaded rod is threadedly connected inside the threaded sleeve and fixedly connected to the outside of the outer conical cover.

[0019] The beneficial effects of the present application are that:

[0020] 1、The present application adopts the technical means that the foam generating mechanism and the foam output mechanism cooperate, generates high-pressure foam by using the foam generating mechanism, and sprays a large amount of micrometer and nanometer foam through the nanometer honeycomb net after the high-pressure foam enters the conical output cover, so as to form a ring-shaped foam dust reduction area wrapping the cutting head, thereby effectively preventing dust from escaping to the outside.

[0021] 2、The present application adopts the technical means that the jet flow device and the spiral device cooperate, inputs high-pressure water by using the explosion-proof water valve, and makes water, foaming liquid and high-pressure gas concentrate and mix in the front mixing pipe and then diffuse and mix in the rear diffusion pipe, so that the diffused and mixed foam is uniformly mixed in the foam cylinder body, and a large amount of small foam is generated through the foaming net, that is, the jet flow device and the spiral device provide a basis for the third foaming of the nanometer honeycomb net.

[0022] 3、The present application adopts the technical means that the conical output cover and the moving sleeve cooperate, moves the moving sleeve by using the threaded sleeve, so as to change the distance between the moving sleeve and the nanometer honeycomb net, the smaller the gap between the moving sleeve and the outer conical cover, the farther the moving sleeve is from the nanometer honeycomb net, and the smaller the thickness of the foam sprayed through the nanometer honeycomb net, and vice versa, that is, the thickness of the foam sprayed through the nanometer honeycomb net can be adjusted according to the amount of dust generated, so as to avoid the problems of foam waste caused by too thick foam and invalid dust reduction caused by too thin foam. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0024] Figure 2 It is a schematic diagram of part of the structure of the present application;

[0025] Figure 3 It is a schematic diagram of the structure of the foam generating mechanism and the foam output mechanism in the present application;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the foam generating mechanism in the present application;

[0027] Figure 5 Figure is a schematic diagram of the cross-section structure of the foam output mechanism in the present application;

[0028] Figure 6 Figure is a schematic diagram of the structure of the adjusting member in the present application.

[0029] Figure: 100, machine body; 110, rocker arm; 120, rotating shaft; 130, cutting head; 200, source combination box; 300, foam generating mechanism; 310, explosion-proof water valve; 320, jet device; 321, front mixing pipe; 322, rear diffusion pipe; 323, jet nozzle; 324, suction chamber; 325, liquid suction pipe; 326, air suction pipe; 330, spiral device; 331, foam cylinder; 332, spiral blade; 333, foaming net; 400, foam output mechanism; 410, conical output cover; 420, nanometer honeycomb net; 430, adjusting member; 431, moving sleeve; 432, connecting rod; 433, connecting plate; 434, threaded sleeve; 435, threaded rod; 440, U-shaped distribution bin; 450, foam elbow. DETAILED DESCRIPTION

[0030] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that discussions of these implementations are merely provided to enable those skilled in the art to better understand so as to be able to implement the subject matter described herein, and variations of elements discussed can be made by one skilled in the art within the scope of the present specification. Various examples can omit, substitute, or add various procedures or components as appropriate. Also, it should be understood that instead of being mounted on a single device, the features described in some examples can be distributed across multiple devices.

[0031] As shown in Figure 1 - Figure 3 The present embodiment provides a dust falling device for a mining working face, which comprises a machine body 100, a rocker arm 110, and a cutting head 130 connected by a rotating shaft 120. The machine body 100, the rocker arm 110, the rotating shaft 120, and the cutting head 130 form an existing machine, and thus the specific structure and connection mode of the machine body 100, the rocker arm 110, the rotating shaft 120, and the cutting head 130 are not described in detail in the present embodiment. The present embodiment further comprises:

[0032] A source combination box 200 is arranged outside the machine body 100. The source combination box 200 comprises a water storage tank, a foaming liquid storage tank, and a compressed gas storage tank fixedly connected outside the machine body 100. An appropriate amount of dust suppressant can be added to the inside of the foaming liquid storage tank to ensure that the foaming liquid has good dust suppression performance. The water storage tank, the foaming liquid storage tank, and the compressed gas storage tank are all fixedly connected with a mine rubber pipe outside. The mine rubber pipe can adapt to the harsh coal mining environment with high risk and high wear;

[0033] The foam generating mechanism 300 is located outside the rocker arm 110 and connected to the power supply assembly box 200. The power supply assembly box 200 provides water, foaming liquid and compressed gas to the foam generating mechanism 300 so that the foam generating mechanism 300 generates foam.

[0034] A foam output mechanism 400 is disposed outside the rocker arm 110 and connected to the foam generating mechanism 300. The foam output mechanism 400 includes a conical output cover 410 fixedly sleeved outside the rotating shaft 120. The end of the conical output cover 410 away from the cutting head 130 is connected to two U-shaped distribution chambers 440 that bypass the rocker arm 110. The ends of the two U-shaped distribution chambers 440 away from the conical output cover 410 are connected to a foam bend 450 connected to the foam cylinder 331 described below. The high-pressure foam generated by the foam generating mechanism 300 can enter the two U-shaped distribution chambers 440 through the foam bend 450. The foam enters the U-shaped distribution chamber 440 and then the conical output hood 410. The conical output hood 410 is equipped with a nano-level honeycomb mesh 420 near the cutting head 130. The nano-level honeycomb mesh 420 is made of corrosion-resistant metal or high-strength engineering plastic. The foam passing through the nano-level honeycomb mesh 420 can be highly segmented to generate a large number of micron and nano-level foams, thereby effectively improving the foam's coverage and dust suppression effect. The foam inside the conical output hood 410 can be sprayed at an angle through the nano-level honeycomb mesh 420 and form an annular foam dust suppression area that wraps around the cutting head 130.

[0035] The above structure allows high-pressure foam to enter the conical output hood 410 and then be sprayed out in large quantities of micron and nano-sized foam through the nano-scale honeycomb mesh 420 to form an annular foam dust suppression area that surrounds the cutting head 130, thereby effectively preventing dust from escaping to the outside.

[0036] In addition, such as Figure 4 As shown, the foam generating mechanism 300 is mounted on the outside of the rocker arm 110 via a bracket. The foam generating mechanism 300 includes an explosion-proof water valve 310, an ejector 320, and a spiral device 330 fixedly connected to the outside of the bracket. The explosion-proof water valve 310, the ejector 320, and the spiral device 330 work together to generate uniform high-pressure foam.

[0037] The inlet of the explosion-proof water valve 310 is connected to the mining hose outside the water storage tank, and the outlet of the explosion-proof water valve 310 is connected to the ejector 320. By activating the explosion-proof water valve 310, high-pressure water can be input into the ejector 320 through the mining hose.

[0038] The jet injector 320 includes a pre-mixing pipe 321 and a post-diffuser pipe 322 that are fixedly connected to each other. A jet nozzle 323 connected to the outlet of an explosion-proof water valve 310 is installed inside the pre-mixing pipe 321. The jet nozzle 323 and the internal space of the pre-mixing pipe 321 form a suction chamber 324. A liquid suction pipe 325 and an air suction pipe 326 connected to the suction chamber 324 are provided outside the pre-mixing pipe 321. The liquid suction pipe 325 is connected to a mining hose outside the foaming liquid storage tank. The suction pipe 326 is connected to the mining hose outside the compressed gas storage tank. After the high-pressure water enters through the jet nozzle 323, according to Bernoulli's theorem, the fluid velocity increases and the pressure decreases accordingly, so that the suction chamber 324 outside the jet nozzle 323 will form a negative pressure environment, so that the liquid suction pipe 325 and the air suction pipe 326 will draw in the foaming liquid and high-pressure gas. The water, foaming liquid and high-pressure gas are concentrated and mixed inside the pre-mixing pipe 321 and then enter the post-diffuser pipe 322 for diffusion mixing.

[0039] The spiral device 330 includes a foam cylinder 331 connected to the post-diffuser 322. The foam cylinder 331 is equipped with spiral blades 332 extending axially. The foam that has been diffused and mixed inside the post-diffuser 322 enters the foam cylinder 331 and continues to mix along the axial direction of the spiral blades 332. The foam cylinder 331 is also equipped with a foaming net 333 that is away from the post-diffuser 322. The uniformly mixed foam first passes through the foaming net 333 to generate a large number of fine foams, and then enters the foam bend 450.

[0040] The above structure enables the jet injector 320 to perform primary foaming technology and the spiral injector 330 to perform secondary foaming technology. The primary foaming of the jet injector 320 and the secondary foaming of the spiral injector 330 can provide a foundation for the subsequent tertiary foaming of the nanoscale honeycomb mesh 420.

[0041] In addition, such as Figure 5 - Figure 6 As shown, the conical output hood 410 consists of an annular plate, an inner cylinder hood, and an outer conical hood. One side of the annular plate is fixedly connected to the U-shaped distribution chamber 440, and the other side of the annular plate is fixedly connected to the inner cylinder hood and the outer conical hood. The conical output hood 410 is equipped with an adjusting component 430 for adjusting the foam spray thickness. The amount of dust generated in different cutting scenarios varies greatly. The adjusting component 430 can adjust the foam spray thickness according to the amount of dust generated, avoiding the problem of foam waste due to excessive thickness and ineffective dust suppression due to excessive thinness.

[0042] The adjusting component 430 includes a movable sleeve 431 slidably connected to the outside of the inner cylinder cover. The outer conical surface of the movable sleeve 431 is inclined with the outer conical cover to ensure that the foam can be output at an angle to form an annular foam dust suppression area that surrounds the cutting head 130. Figure 5The movable sleeve 431 is closest to the nano-level honeycomb mesh 420. At this time, the foam thickness sprayed through the nano-level honeycomb mesh 420 is at its maximum. Two connecting rods 432 are symmetrically fixedly connected to the end of the movable sleeve 431 near the annular plate. Both connecting rods 432 pass through the annular plate and are fixedly connected to the connecting plate 433. A through hole is opened in the middle of the connecting plate 433. A threaded sleeve 434 is rotatably connected to the outside of the through hole through a rotating cylinder. A threaded rod 435 is threadedly connected inside the threaded sleeve 434, passing through the through hole and fixedly connected to the outside of the outer cone cover. By rotating the threaded sleeve 434, the movable sleeve 431 can be moved through the connecting plate 433 and the connecting rod 432. The further the movable sleeve 431 is from the nano-level honeycomb mesh 420, the smaller the gap between the movable sleeve 431 and the outer cone cover, and the smaller the foam thickness sprayed through the nano-level honeycomb mesh 420. Conversely, the closer the movable sleeve 431 is to the outer cone cover, the larger the foam thickness.

[0043] The above structure allows the movable sleeve 431 to move to change the distance between itself and the nano-scale honeycomb mesh 420, thereby changing the thickness of the foam sprayed by the nano-scale honeycomb mesh 420, avoiding the problem of foam waste caused by excessive thickness and ineffective dust suppression caused by excessive thinness.

[0044] The specific working principle of this implementation is as follows: First, ensure that each storage tank in the power supply combination box 200 is in the power supply state. An appropriate amount of dust suppressant can be added inside the foaming liquid storage tank to ensure that the foaming liquid has good dust suppression performance.

[0045] Then, the explosion-proof water valve 310 is activated, allowing high-pressure water to enter the jet nozzle 323 of the jet injector 320 through the mining hose. After the high-pressure water jet nozzle 323 enters, a negative pressure environment is formed inside the suction chamber 324, causing the liquid suction pipe 325 and the air suction pipe 326 to draw in foaming liquid and high-pressure gas through the mining hose. This allows the water, foaming liquid, and high-pressure gas to be concentrated and mixed inside the pre-mixing pipe 321. The concentrated foam then enters the post-diffuser pipe 322 for diffusion and mixing. The diffused and mixed foam then enters the foam cylinder 331 and continues to mix along the axial extension direction of the spiral blades 332 to form uniform foam. The uniformly mixed foam then passes through the foaming net 333 to generate a large number of fine foams. In other words, water, foaming liquid, and high-pressure gas can undergo primary foaming through the jet injector 320 and secondary foaming through the spiral injector 330 to form a large number of uniform, high-pressure fine foams.

[0046] Subsequently, uniform, high-pressure fine foam enters two U-shaped distribution chambers 440 through foam bend 450, then enters conical output hood 410. The foam inside conical output hood 410 then enters the gap between moving sleeve 431 and outer cone hood, and finally passes through nano-level honeycomb mesh 420 to spray out a large number of micron and nano-level foams, forming an annular foam dust suppression area that wraps around cutting head 130, thereby effectively preventing dust from escaping to the outside.

[0047] When the thickness of the foam sprayed by the nano-scale honeycomb mesh 420 needs to be adjusted according to the amount of dust generated, the threaded sleeves 434 on both sides can be rotated. Taking the rotation of one threaded sleeve 434 as an example, by rotating the threaded sleeve 434, the connecting plate 433 drives the moving sleeve 431 to move through the connecting rod 432, thereby changing the distance between the moving sleeve 431 and the nano-scale honeycomb mesh 420. The farther the moving sleeve 431 is from the nano-scale honeycomb mesh 420, the smaller the gap between the moving sleeve 431 and the outer cone, and the thinner the foam sprayed through the nano-scale honeycomb mesh 420. Conversely, the closer the moving sleeve 431 is to the nano-scale honeycomb mesh 420, the larger the gap between the moving sleeve 431 and the outer cone, and the thicker the foam sprayed through the nano-scale honeycomb mesh 420. In this way, the thickness of the foam sprayed by the nano-scale honeycomb mesh 420 can be adjusted, avoiding the problems of excessive foam waste due to excessive thickness and ineffective dust suppression due to excessive thinness.

[0048] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. A dust suppression device for a mining face, comprising a tunneling machine body (100), a rocker arm (110), and a cutting head (130) rotatably connected via a shaft (120), characterized in that, Also includes: The power supply assembly box (200) is located outside the tunneling machine body (100); A foam generating mechanism (300) is disposed outside the rocker arm (110) and connected to the power supply assembly housing (200); A foam output mechanism (400) is disposed outside the rocker arm (110) and connected to the foam generating mechanism (300). The foam output mechanism (400) includes a conical output cover (410) fixedly sleeved outside the rotating shaft (120). A nano-scale honeycomb mesh (420) is installed at one end of the conical output cover (410) near the cutting head (130). The foam inside the conical output cover (410) can be sprayed obliquely through the nano-scale honeycomb mesh (420) and form an annular foam dust suppression area that surrounds the cutting head (130). An adjusting member (430) for adjusting the foam spray thickness is provided inside the conical output cover (410).

2. A dust suppression device for mining faces according to claim 1, characterized in that, The power supply assembly box (200) includes a water storage tank, a foaming liquid storage tank and a compressed gas storage tank fixedly connected to the outside of the tunneling machine body (100). The water storage tank, the foaming liquid storage tank and the compressed gas storage tank are all fixedly connected to mining hoses.

3. A dust suppression device for mining faces according to claim 2, characterized in that, The foam generating mechanism (300) is mounted on the outside of the rocker arm (110) by a bracket. The foam generating mechanism (300) includes an explosion-proof water valve (310), a jet injector (320) and a spiral injector (330) fixedly connected to the outside of the bracket.

4. A dust suppression device for mining faces according to claim 3, characterized in that, The inlet of the explosion-proof water valve (310) is connected to the mining hose outside the water storage tank, and the outlet of the explosion-proof water valve (310) is connected to the jet injector (320).

5. A dust suppression device for mining faces according to claim 4, characterized in that, The jet injector (320) includes a pre-mixing pipe (321) and a post-diffuser pipe (322) that are fixedly connected to each other. The pre-mixing pipe (321) is equipped with a jet nozzle (323) that is connected to the outlet of the explosion-proof water valve (310). The jet nozzle (323) and the internal space of the pre-mixing pipe (321) form an intake chamber (324). The pre-mixing pipe (321) is provided with a liquid suction pipe (325) and an air suction pipe (326) that are connected to the intake chamber (324). The liquid suction pipe (325) is connected to a mining hose outside the foaming liquid storage tank, and the air suction pipe (326) is connected to a mining hose outside the compressed gas storage tank.

6. A dust suppression device for a mining face according to claim 5, characterized in that, The spiral device (330) includes a foam cylinder (331) communicating with a rear diffuser (322), and the foam cylinder (331) is equipped with axially extending spiral blades (332). The foam cylinder (331) is also equipped with a foaming net (333) that is away from the rear diffuser (322).

7. A dust suppression device for a mining face according to claim 6, characterized in that, The conical output cover (410) is connected to two U-shaped distribution chambers (440) that pass around the rocker arm (110) at the end away from the cutting head (130). The two U-shaped distribution chambers (440) are connected to a foam bend (450) that is connected to the foam cylinder (331) at the end away from the conical output cover (410).

8. A dust suppression device for a mining face according to claim 7, characterized in that, The conical output cover (410) consists of an annular plate, an inner cylinder cover, and an outer conical cover. One side of the annular plate is fixedly connected to the U-shaped distribution chamber (440), and the other side of the annular plate is fixedly connected to the inner cylinder cover and the outer conical cover.

9. A dust suppression device for a mining face according to claim 8, characterized in that, The adjusting component (430) includes a movable sleeve (431) slidably connected to the outside of the inner cylinder cover. The outer conical surface of the movable sleeve (431) has the same inclination as the outer conical cover. Two connecting rods (432) are symmetrically fixedly connected to one end of the movable sleeve (431) near the annular plate. Both connecting rods (432) pass through the annular plate and are fixedly connected to a connecting plate (433). A through hole is provided in the middle of the connecting plate (433). A threaded sleeve (434) is rotatably connected to the outside of the through hole through a rotating cylinder. A threaded rod (435) is threadedly connected inside the threaded sleeve (434) and passes through the through hole and is fixedly connected to the outside of the outer conical cover.

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