Negative-pressure dust removal device for underground coal mine gas extraction drilling construction orifice

Abstract

The utility model provides a negative pressure dust removal device for an underground coal mine gas extraction drilling construction orifice, which belongs to the technical field of coal mine dust removal and is characterized in that when the negative pressure dust removal device for the underground coal mine gas extraction drilling construction orifice is adopted, a drill rod outlet of an orifice blowout prevention hole box is embedded into a coal body and is in sealed connection with the coal body; a drilling rod penetrates through the drilling rod inlet and the drilling rod outlet to drill into a coal body for drilling, negative pressure is provided through the extraction pipeline, dust, drilling slag and water at a drilling hole opening are introduced into the hole opening anti-spraying hole box, part of the dust, the drilling slag and the water are deposited at the bottom of the hole opening anti-spraying hole box, a large amount of drilling slag is prevented from being sprayed out, and hole opening anti-spraying is achieved. Dust, drilling slag and water mixed gas treated by the orifice blowout prevention hole box enters the gas-slag separator, is subjected to primary filtering separation through the first filter screen, then enters the auxiliary dust removal tee joint and is subjected to secondary filtering separation through the second filter screen, most of dust at the orifice of a drilled hole can be removed, the sight of operators is guaranteed, and the working environment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine dust removal, and specifically discloses a negative pressure dust removal device for a construction hole of a gas extraction drilling hole in an underground coal mine. Background Art

[0002] Using a directional drill to drill long holes in this coal seam can improve gas extraction efficiency. However, because the directional drill motor requires hydraulic power, the geological conditions of the coal seam gas make it difficult to drill long holes in this coal seam, thus limiting the advantages of directional drilling. Therefore, we are promoting the use of nitrogen power combined with an air screw motor to test the long-hole directional drilling in this coal seam.

[0003] During the drilling process of a directional drill using nitrogen power and an air screw motor, the dust blown out of the hole by the medium-pressure gas is very large, which obstructs the operator's vision and pollutes the working environment. Therefore, a negative pressure dust removal device for the hole mouth of underground coal mine gas extraction drilling construction is designed for dust removal at the drilling hole mouth. Utility Model Content

[0004] The utility model provides a negative pressure dust removal device for the borehole construction of underground coal mine gas extraction, which removes dust from the borehole and improves the technical problem of large dust at the borehole mouth.

[0005] The above-mentioned underground coal mine gas extraction drilling construction hole negative pressure dust removal device includes a hole mouth blowout prevention box, a gas-slag separator, an auxiliary dust removal tee and an extraction pipeline; the hole mouth blowout prevention box is provided with a drill rod inlet, a drill rod outlet and a negative pressure interface, and the center lines of the drill rod inlet and the drill rod outlet coincide; the gas-slag separator is provided with a gas-slag inlet, an exhaust port and a slag discharge port, and a first filter is installed in the gas-slag separator, the gas-slag inlet and the exhaust port are located on both sides of the first filter, and the slag discharge port is located below the first filter; the three interfaces of the auxiliary dust removal tee are the gas-slag inlet, the exhaust port and the slag discharge port, and a second filter is installed in the auxiliary dust removal tee, the gas-slag inlet and the exhaust port are located on both sides of the second filter, and the slag discharge port is located below the second filter; the negative pressure interface of the hole mouth blowout prevention box is connected to the gas-slag inlet of the gas-slag separator through a pipeline, the exhaust port of the gas-slag separator is connected to the gas-slag inlet of the auxiliary dust removal tee through a pipeline, and the exhaust port of the auxiliary dust removal tee is connected to the extraction pipeline through a pipeline.

[0006] In the above-mentioned underground coal mine gas extraction drilling construction hole negative pressure dust removal device, a slag discharge port is also provided on the hole mouth blowout prevention box; the hole mouth blowout prevention box includes a top plate, a bottom plate opposite to the top plate, and a side plate connecting the top plate and the bottom plate, the drill rod inlet and the drill rod outlet are arranged on the side plates, the negative pressure interface is arranged on the top plate, the slag discharge port is arranged on the bottom plate, and a gate valve I is installed on the slag discharge port.

[0007] In the above-mentioned underground coal mine gas extraction drilling construction hole mouth negative pressure dust removal device, in the hole mouth blowout prevention hole box, the inner diameter of the bottom plate gradually decreases from top to bottom, and the slag discharge port is located at the lowest point of the bottom plate.

[0008] In the above-mentioned underground coal mine gas extraction drilling hole construction hole negative pressure dust removal device, the gas-slag separator includes a top plate, a bottom plate opposite to the top plate, and a side plate connecting the top plate and the bottom plate. The gas-slag inlet and exhaust port are arranged on the top plate, and the slag discharge port is arranged on the bottom plate. Gate valve II is installed on the exhaust port and the slag discharge port.

[0009] In the above-mentioned underground coal mine gas extraction drilling hole construction hole negative pressure dust removal device, in the gas-slag separator, the inner diameter of the bottom plate gradually decreases from top to bottom, and the slag discharge port is located at the lowest point of the bottom plate.

[0010] In the above-mentioned underground coal mine gas extraction drilling hole construction hole negative pressure dust removal device, the auxiliary dust removal tee is a T-shaped tee, the interfaces on both sides are the gas slag inlet and the exhaust port respectively, and the interface at the bottom is the slag discharge port, on which a gate valve III is installed.

[0011] In the above-mentioned underground coal mine gas extraction drilling hole construction hole negative pressure dust removal device, the pipeline is a PE hose.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] When the above-mentioned underground coal mine gas extraction drilling hole construction hole mouth negative pressure dust removal device is used, the drill pipe outlet of the hole mouth blowout prevention box is embedded in the coal body and sealed with the coal body. The drill pipe passes through the drill pipe inlet and the drill pipe outlet and drills into the coal body to drill a hole. The extraction pipeline is used to provide negative pressure to introduce the dust, drilling cuttings and water at the borehole mouth into the hole mouth blowout prevention box. Some dust, drilling cuttings and water are deposited at the bottom of the hole mouth blowout prevention box to prevent large amounts of drilling cuttings from being ejected, thus achieving hole mouth blowout prevention. The dust, drilling cuttings and water mixed gas treated by the hole mouth blowout prevention box enters the gas-slag separator, undergoes primary filtration and separation through the first filter, and then enters the auxiliary dust removal tee and undergoes secondary filtration and separation through the second filter. This can remove most of the dust at the borehole mouth, ensure the operator's line of sight, and improve the working environment. The treated gas enters the extraction pipeline for discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1This is a structural diagram of the hole mouth negative pressure dust removal device for gas extraction drilling construction in underground coal mines.

[0016] In the figure: 1-orifice blowout prevention box; 2-gas-slag separator; 3-auxiliary dust removal tee; 4-extraction pipeline; 5-first filter; 6-gate valve II; 7-second filter; 8-gate valve III; 9-pipeline. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs.

[0018] The words "first", "second" and similar terms used in the specification and claims of this utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprises" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0019] This embodiment provides a negative pressure dust removal device for borehole construction in underground coal mine gas extraction, including a borehole anti-blowout box 1, a gas-slag separator 2, an auxiliary dust removal tee 3 and an extraction pipeline 4.

[0020] The orifice blowout prevention box 1 is provided with a drill rod inlet, a drill rod outlet, a negative pressure interface and a slag discharge port, and the center lines of the drill rod inlet and the drill rod outlet coincide; the orifice blowout prevention box 1 includes a top plate, a bottom plate opposite to the top plate, and a side plate connecting the top plate and the bottom plate, the drill rod inlet and the drill rod outlet are arranged on the side plates, the negative pressure interface is arranged on the top plate, the slag discharge port is arranged on the bottom plate, and a gate valve I is installed on the slag discharge port, which is used to open or close the slag discharge port; the inner diameter of the bottom plate gradually decreases from top to bottom, and the slag discharge port is located at the lowest point of the bottom plate.

[0021] The gas-slag separator 2 is provided with a gas-slag inlet, an exhaust port and a slag discharge port. A first filter screen 5 is installed in the gas-slag separator 2. The gas-slag inlet and the exhaust port are located on both sides of the first filter screen 5, and the slag discharge port is located below the first filter screen 5; the gas-slag separator 2 includes a top plate, a bottom plate opposite to the top plate, and a side plate connecting the top plate and the bottom plate. The gas-slag inlet and the exhaust port are arranged on the top plate, and the slag discharge port is arranged on the bottom plate. Gate valves II6 are installed on the exhaust port and the slag discharge port. The gate valve II6 is used to open or close the exhaust port and the slag discharge port. The gate valve II6 on the exhaust port is also used to control the opening and closing of the negative pressure of the entire device; the inner diameter of the bottom plate gradually decreases from top to bottom, and the slag discharge port is located at the lowest point of the bottom plate.

[0022] The three interfaces of the auxiliary dust removal tee 3 are the gas slag inlet, the exhaust port and the slag discharge port. A second filter screen 7 is installed in the auxiliary dust removal tee 3. The gas slag inlet and the exhaust port are located on both sides of the second filter screen 7, and the slag discharge port is located below the second filter screen 7; the auxiliary dust removal tee 3 is a T-shaped tee, and the interfaces on both sides are the gas slag inlet and the exhaust port, and the interface at the bottom is the slag discharge port, and a gate valve III 8 is installed on the slag discharge port.

[0023] The negative pressure interface of the orifice blowout prevention hole box 1 is connected to the gas-slag inlet of the gas-slag separator 2 via pipe 9. The exhaust port of the gas-slag separator 2 is connected to the gas-slag inlet of the auxiliary dust removal tee 3 via pipe 9. The exhaust port of the auxiliary dust removal tee 3 is connected to the extraction pipeline 4 via pipe 9. Pipe 9 is a PE hose.

[0024] When the above-mentioned underground coal mine gas extraction drilling construction hole mouth negative pressure dust removal device is used, the drill rod outlet of the hole mouth blowout prevention box 1 (the right interface in the figure) is embedded in the coal body and sealed with the coal body, and the drill rod passes through the drill rod inlet (the left interface in the figure) and the drill rod outlet to drill into the coal body for drilling. The extraction pipeline 4 is used to provide negative pressure to introduce the dust, drill cuttings and water at the borehole mouth into the hole mouth blowout prevention box 1. Part of the dust, drill cuttings and water are deposited at the bottom of the hole mouth blowout prevention box to avoid large amounts of drill cuttings from being ejected, thereby realizing the hole mouth blowout prevention. The bottom plate of the hole mouth blowout prevention box 1 adopts a design in which the inner diameter gradually decreases from top to bottom, and the slag discharge port is set at the lowest point of the bottom plate, so that the dust, drill cuttings and water can be deposited and gathered at the slag discharge port for convenient centralized discharge. The dust, drilling cuttings and water mixed gas processed by the orifice blowout prevention box 1 enters the gas-slag separator 2, and is initially filtered and separated by the first filter screen. Another part of the dust, drilling cuttings and water deposits are retained at the bottom of the gas-slag separator 2. Like the orifice blowout prevention box 1, the bottom plate of the gas-slag separator 2 is designed with an inner diameter that gradually decreases from top to bottom, and the slag discharge port is set at the lowest point of the bottom plate, so that the dust, drilling cuttings and water deposits can be gathered at the slag discharge port for easy centralized discharge. The dust, drilling cuttings and water mixed gas processed by the gas-slag separator 2 enters the auxiliary dust removal tee 3 again, and is filtered and separated for the second time by the second filter screen 7, which can remove most of the dust at the borehole orifice, ensure the operator's line of sight, and improve the working environment. The treated gas enters the extraction pipeline 4 for discharge. The auxiliary dust removal tee 3 is processed using the existing T-type tee, which has a simple structure and is easy to manufacture. After the construction of a drill rod is completed, the gate valve at the slag discharge port is opened to discharge slag.

[0025] The entire device has obvious dust removal effect, is easy to operate, not easy to damage and has high working efficiency.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A negative pressure dust removal device for drilling hole construction in underground coal mine gas extraction, characterized in that: It includes the orifice blowout prevention box, gas-slag separator, auxiliary dust removal tee and extraction pipeline; The orifice blowout prevention hole box is provided with a drill rod inlet, a drill rod outlet and a negative pressure interface, and the center lines of the drill rod inlet and the drill rod outlet coincide with each other; The gas-slag separator is provided with a gas-slag inlet, an exhaust port and a slag discharge port. A first filter screen is installed in the gas-slag separator. The gas-slag inlet and the exhaust port are located on both sides of the first filter screen, and the slag discharge port is located below the first filter screen. The three interfaces of the auxiliary dust removal tee are respectively the gas slag inlet, the exhaust port and the slag discharge port. A second filter is installed in the auxiliary dust removal tee. The gas slag inlet and the exhaust port are located on both sides of the second filter, and the slag discharge port is located below the second filter. The negative pressure interface of the orifice blowout prevention hole box is connected to the gas-slag inlet of the gas-slag separator through a pipeline, the exhaust port of the gas-slag separator is connected to the gas-slag inlet of the auxiliary dust removal tee through a pipeline, and the exhaust port of the auxiliary dust removal tee is connected to the extraction pipeline through a pipeline.

2. The negative pressure dust removal device for underground coal mine gas extraction drilling construction according to claim 1 is characterized in that: The orifice blowout prevention box is also provided with a slag discharge port; The orifice blowout prevention box includes a top plate, a bottom plate opposite to the top plate, and a side plate connecting the top plate and the bottom plate. The drill pipe inlet and the drill pipe outlet are arranged on the side plates, the negative pressure interface is arranged on the top plate, the slag discharge port is arranged on the bottom plate, and a gate valve I is installed on the slag discharge port.

3. The negative pressure dust removal device for underground coal mine gas extraction drilling construction according to claim 2 is characterized in that: In the orifice blowout prevention box, the inner diameter of the bottom plate gradually decreases from top to bottom, and the slag discharge port is located at the lowest point of the bottom plate.

4. The negative pressure dust removal device for underground coal mine gas extraction drilling construction according to claim 1 is characterized in that: The gas-slag separator includes a top plate, a bottom plate opposite to the top plate, and a side plate connecting the top plate and the bottom plate. The gas-slag inlet and exhaust port are arranged on the top plate, and the slag discharge port is arranged on the bottom plate. Gate valves II are installed on the exhaust port and the slag discharge port.

5. The negative pressure dust removal device for underground coal mine gas extraction drilling construction according to claim 4 is characterized in that: In the gas-slag separator, the inner diameter of the bottom plate gradually decreases from top to bottom, and the slag discharge port is located at the lowest point of the bottom plate.

6. The negative pressure dust removal device for underground coal mine gas extraction drilling construction according to claim 1 is characterized in that: The auxiliary dust removal tee is a T-shaped tee. The interfaces on both sides are the gas slag inlet and exhaust port respectively. The interface at the bottom is the slag discharge port, and a gate valve III is installed on the slag discharge port.

7. The negative pressure dust removal device for underground coal mine gas extraction drilling construction according to claim 1 is characterized in that: The pipe is a PE hose.

Images