Closed coal dust collecting device for coal seam gas content measurement and sampling

Abstract

The utility model discloses a closed coal dust collecting device for coal seam gas content measuring and sampling. The closed coal dust collecting device for coal seam gas content measuring and sampling comprises a sampling pipe, an inclined three-way pipe, a front end cover and a rear end cover, the inclined three-way pipe is provided with an inclined outlet, a front pipe end and a rear pipe end; the inclined outlet is connected with the coal dust collecting bag in an inclined upward extending manner; the front pipe end is coaxially connected with the front end cover, and the upper end of the front end cover is provided with a through hole for a coal drill rod to penetrate; and the rear end pipe is axially communicated with the sampling pipe. Compared with the prior art, the closed coal dust collecting device for measuring and sampling the coal seam gas content ensures that a coal sample smoothly enters the sampling pipe through a conical structure and an axial communication design; the dustproof brush and the air bag are dual-sealed, so that external coal dust is effectively isolated, the coal dust is prevented from flying in the sampling process, and a good working environment is created for workers; and the butterfly buckle and the elastic ring are quickly disassembled and assembled, so that the working efficiency of underground staff is improved.

Description

Technical Field

[0001] This utility model relates to the field of lighting, and in particular to a closed coal dust collection device for measuring and sampling coal seam gas content. Background Technology

[0002] Coal and gas outburst is an abnormal dynamic phenomenon in which broken coal, rock, and gas are suddenly thrown from the coal or rock mass into the mining space under the combined action of ground stress and gas. It is a powerful natural disaster in underground coal mine production, seriously threatening the safe production of coal mines and is extremely destructive.

[0003] Accurate and scientific prediction of coal and gas outbursts is the prerequisite and key to guiding the rational and effective implementation of coal and gas outburst prevention and control measures. Therefore, coal and gas outburst prediction has significant practical implications. In recent years, coal seam gas content has been widely used to predict the risk of coal and gas outbursts.

[0004] Gas content determination is divided into direct and indirect methods. The direct method involves taking coal samples directly from underground mines to determine the gas content of the coal seam. Specifically, there are two types: one is to determine the gas dissociation characteristics of drill cuttings underground to obtain the gas content of the coal seam; the other is to directly determine the gas content of the coal seam by taking coal core samples. This method involves on-site sampling, sealing, and measuring the gas dissociation characteristics of the coal, utilizing these characteristics and the gas content of the coal after initial exposure for a certain period.

[0005] The amount of gas loss is calculated, and the gas content is further calculated using equipment. Sampling is usually done by connecting an impact drill or electric drill to a coal drill rod. During the coal sampling process, a large amount of coal powder flows out from the rear end and causes coal dust to float, resulting in pollution of the working environment and harming the health of workers. Utility Model Content

[0006] To address the aforementioned problems, the purpose of this invention is to provide a closed-loop coal dust collection device for measuring and sampling coal seam gas content.

[0007] The technical solution of this utility model is a closed coal dust collection device for measuring and sampling coal seam gas content:

[0008] A closed coal dust collection device for measuring coal seam gas content includes: a sampling tube, and front and rear end caps of an inclined tee tube;

[0009] The oblique tee pipe is provided with an oblique outlet, a front pipe end, and a rear pipe end, wherein:

[0010] The inclined outlet is connected to the coal dust collection bag in an upwardly inclined manner;

[0011] The front tube end is coaxially connected to the front end cover, and the upper end of the front end cover is provided with a through hole for the coal supply drill rod to pass through.

[0012] The rear tube end is axially connected to the sampling tube.

[0013] Furthermore, the outer wall of the sampling tube is provided with an air bladder for sealing with the hole wall, and the air bladder is provided with an inflation nozzle.

[0014] Furthermore, the lower end of the oblique tee tube has a tapered structure that is wider at the top and narrower at the bottom, the outlet of the rear tube is located at the center of the lower end of the tapered structure, and the upper end of the sampling tube is inserted into the outlet of the rear tube.

[0015] Furthermore, the front tube end has several slots evenly arranged circumferentially on its rim. The slots are L-shaped. The outer wall of the front cover has several studs that correspond one-to-one with the slots. The studs are threaded with butterfly buckles for fixing the front cover to the oblique tee tube.

[0016] Furthermore, a dustproof brush is provided inside the front tube end. The dustproof brush includes a fixing ring and several bristles on the inner wall of the fixing ring of the connecting pipe. The fixing ring is fixedly connected to the inner wall of the front tube end, and the ends of several bristles form a central hole coaxial with the through hole, through which the coal supply drill rod passes.

[0017] Furthermore, the outer wall of the inclined tee pipe is provided with two handles, which are symmetrically arranged about the inclined outlet.

[0018] Furthermore, the inclined outlet has an annular groove on its rim to accommodate an elastic ring for securing the coal dust collection bag.

[0019] This utility model provides a closed coal dust collection device for measuring and sampling coal seam gas content. Compared with existing devices, its advantages are as follows:

[0020] When using the closed-type coal dust collection device for measuring and sampling coal seam gas content of this utility model, firstly, an impact drill is used to connect a coal drill rod and drill a certain distance. Then, the closed-type coal dust collection device is placed into the borehole, and air is inflated into the airbag through the air inlet to seal the borehole. The coal dust collection bag is connected to the inclined outlet of the inclined tee pipe, and the coal drill rod is inserted through the through hole on the front end cap. Drilling is then carried out while sampling is performed. The handle is used to fix the position, and the coal dust enters the coal dust collection bag. The dustproof brush inside the front end of the pipe prevents the coal dust from spreading. Compared to existing technologies, the closed-type coal dust collection device for measuring coal seam gas content of this utility model ensures smooth entry of coal samples into the sampling tube through a conical structure and axial connection design; the dustproof brush and airbag double seal effectively isolate external coal dust, preventing coal dust from flying during the sampling process and creating a good working environment for the staff; the butterfly buckle and elastic ring enable quick assembly and disassembly, improving the working efficiency of underground workers. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a closed coal dust collection device for measuring and sampling coal seam gas content provided in this embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of the closed coal dust collection device for measuring and sampling coal seam gas content provided in this embodiment of the utility model;

[0024] Figure 3 This is a top view of the cross-section of the closed coal dust collection device for measuring and sampling coal seam gas content provided in this embodiment of the utility model;

[0025] Figure 4 This is a top cross-sectional view of the closed coal dust collection device for measuring and sampling coal seam gas content provided in this embodiment of the utility model.

[0026] In the diagram: 1. Sampling tube; 2. Angled tee tube; 3. Front end cap; 4. Airbag; 5. Inflation nozzle; 6. Slot; 7. Stud; 8. Butterfly buckle; 9. Dustproof brush; 10. Handle; 11. Annular groove; 12. Through hole; 13. Fixing ring; 14. Brush bristles; 15. Center hole. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Specific embodiments of the closed-type coal dust collection device for measuring and sampling coal seam gas content of this utility model are as follows: Figures 1 to 4As shown, the system includes: a sampling tube 1, an inclined tee tube 2, and a front end cap 3. The sampling tube 1 has a cylindrical structure with an annular air bladder 4 on its outer wall. The air bladder 4 is inflated through an air inlet 5 and then sealed to the borehole wall. The lower end of the sampling tube 1 is open for collecting coal samples. The inclined tee tube 2 has a Y-shaped tee structure, including an inclined outlet, a front end, and a rear end. The inclined outlet extends upwards at a 30° angle, and the front end has an annular groove 11 with an elastic rubber ring embedded in it to fix the open end of the coal dust collection bag. The rear end is located at the lower end of the inclined tee tube 2 and has a tapered structure that is wider at the top and narrower at the bottom. The lower end of the sampling tube 1 is inserted into the tapered rear end cap and connected for axial connection. The front end cap 3 is a three-section structure integrally formed, consisting of a rear straight section, a tapered section, and a front straight section. A through hole 12 is opened at the top of the front end cap, with a diameter slightly larger than the diameter of the coal drill rod. The tapered pipe section connects the front straight pipe section and the rear straight pipe section, and the taper matches the inner wall of the front end hole of the oblique tee pipe 2. The front straight pipe section is inserted into the front pipe end and sealed by the dustproof brush 9; the dustproof brush 9 consists of a fixing ring 13 and nylon bristles 14, the bristles 14 forming a central hole 15, and the central hole 15 is coaxial with the through hole 12.

[0029] The front pipe end has two L-shaped slots 6 evenly distributed around its circumference. Studs 7 are welded to corresponding positions on the outer wall of the front straight pipe section. After the studs 7 are inserted into the slots 6, the butterfly buckle 8 is tightened to press against the outer wall of the inclined tee pipe 2, achieving quick locking. The coal dust collection bag is then placed on the elastic ring of the inclined outlet, and the elastic ring provides a seal.

[0030] Two arc-shaped handles 10 are symmetrically attached to the outer wall of the inclined tee pipe 2 for easy gripping during operation. When the coal drill rod passes through the through hole 12, the bristles 14 are pressed tightly against the surface of the drill rod to prevent coal dust from entering the interior of the front end cover 3. Compressed air is injected through the air inlet 5 to inflate the air bag 4 and make it fit against the borehole wall to block external coal dust interference.

[0031] When using the closed-type coal dust collection device for measuring and sampling coal seam gas content of this utility model, the front cover 3 and the inclined tee pipe 2 are locked together with the butterfly buckle 8, and the sampling tube 1 is inserted into the rear pipe end; the coal dust collection bag is placed on the elastic ring of the inclined outlet. First, use an impact drill to connect the coal drill rod and drill a certain distance. Then, place the closed-type coal dust collection device for measuring and sampling coal seam gas content of this utility model into the borehole, and inflate the air bag 4 through the air inlet 5 to seal the borehole. Connect the coal dust collection bag to the inclined outlet of the inclined tee pipe 2, and insert the coal drill rod through the through hole 12 on the front cover 3. Drill and sample at the same time. The handle 10 is used to fix the position. Coal dust enters the coal dust collection bag, and the dustproof brush 9 in the front cover 3 prevents the coal dust from spreading. After the operation is completed, release the air pressure in the air bag 4, loosen the butterfly buckle 8 to separate the front cover 3, and take out the coal sample and the coal dust collection bag. Compared with existing technologies, the closed coal dust collection device for measuring coal seam gas content of this utility model ensures smooth entry of coal samples into the sampling tube 1 through a conical structure and axial connection design; the dustproof brush 9 and airbag 4 provide double sealing, effectively isolating external coal dust and preventing coal dust from flying during the sampling process, creating a good working environment for the staff; the butterfly buckle 8 and elastic ring enable quick assembly and disassembly, improving the working efficiency of underground employees.

[0032] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A closed coal dust collection device for measuring and sampling coal seam gas content, characterized in that, include: Sampling tube, angled tee tube, and front and rear end caps; The oblique tee pipe is provided with an oblique outlet, a front pipe end, and a rear pipe end, wherein: The inclined outlet is connected to the coal dust collection bag in an upwardly inclined manner; The front tube end is coaxially connected to the front end cover, and the upper end of the front end cover is provided with a through hole for the coal supply drill rod to pass through. The rear tube end is axially connected to the sampling tube.

2. The closed coal dust collection device for measuring and sampling coal seam gas content according to claim 1, characterized in that, The outer wall of the sampling tube is provided with an air bladder for sealing with the borehole wall, and the air bladder is provided with an inflation nozzle.

3. The closed coal dust collection device for measuring and sampling coal seam gas content according to claim 1, characterized in that, The lower end of the oblique tee tube has a tapered structure that is larger at the top and smaller at the bottom. The rear tube end is located at the center of the lower end of the tapered structure, and the upper end of the sampling tube is inserted into the rear tube end.

4. The closed coal dust collection device for measuring and sampling coal seam gas content according to claim 1, characterized in that, The pipe end cap includes a front straight pipe section, a tapered pipe section that is smaller at the top and larger at the bottom, and a rear pipe section that are integrally formed from top to bottom. The rear pipe end is inserted into the rear end cap.

5. The closed-type coal dust collection device for measuring and sampling coal seam gas content according to claim 4, characterized in that, The front tube end has several slots evenly arranged circumferentially on its rim. The slots are L-shaped. The outer wall of the front cover has several studs that correspond one-to-one with the slots. The studs are threaded with butterfly buckles for fixing the front cover to the oblique tee tube.

6. The closed coal dust collection device for measuring and sampling coal seam gas content according to claim 4, characterized in that, The front tube end is provided with a dustproof brush. The dustproof brush includes a fixing ring and several bristles on the inner wall of the fixing ring. The fixing ring is fixedly connected to the inner wall of the front tube end. The front ends of several bristles form a central hole that is coaxial with the through hole and through which the coal supply drill rod passes.

7. The closed coal dust collection device for measuring and sampling coal seam gas content according to claim 1, characterized in that, The oblique tee pipe has two handles on its outer wall, and the two handles are arranged symmetrically about the oblique outlet.

8. The closed coal dust collection device for measuring and sampling coal seam gas content according to claim 1, characterized in that, The inclined outlet has an annular groove on its rim to accommodate an elastic ring for securing the coal dust collection bag.

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