Extraction drilling device for soft coal seam

Abstract

The utility model discloses a soft coal seam extraction drilling device which comprises a main body pipe, a drill bit, an outer pipe and a reinforcing mechanism. The main body pipe is arranged, the drill bit is connected to the front end of the main body pipe, drilling can be conducted, the outer pipe is arranged on the outer side of the main body pipe, at least two sets of reinforcing mechanisms are arranged on the outer side of the outer pipe at equal intervals, each reinforcing mechanism comprises an extrusion mechanism and a leveling ring, and crushed aggregates generated when the drill bit conducts drilling can be extruded to the inner wall of a hole channel through the extrusion mechanisms; the structural density of the inner wall of the pore channel is increased, soil is more compact, the overall strength can be effectively enhanced, collapse of the pore channel is avoided, safety is improved, and follow-up operation is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of coal seam extraction drilling, in particular to a soft coal seam extraction drilling device. Background Art

[0002] Coal seam extraction drilling is a crucial technical measure in coal mine safety and production. It is mainly used to extract gas in coal seams and goafs to the ground or discharge it into the total return air flow. This process involves drilling into coal seams and gas concentration areas, connecting boreholes through special pipelines, and using extraction equipment to extract gas from coal seams and goafs.

[0003] However, when drilling in soft coal seams, due to the relatively soft structure of the coal seams, poor permeability, and low structural strength, during the drilling process, as the drilling depth increases, the inner wall of the hole may collapse due to impact vibration, thereby affecting the drilling efficiency and posing certain safety hazards. Utility Model Content

[0004] The utility model aims to provide a soft coal seam extraction drilling device to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a soft coal seam extraction drilling device, including a main body pipe, a group of inlet pipes are connected to the front end of the main body pipe, and at least two groups of discharge ports are evenly spaced outside the rear end of the inlet pipe near the main body pipe, a driving shaft is provided at the middle end of the main body pipe, a group of transmission arms are connected to the front end of the driving shaft, the front end of the transmission arm extends through to the front end of the inlet pipe and is connected to a group of drill bits, an outer tube is provided on the outside of the main body pipe, and at least two groups of reinforcement mechanisms are evenly spaced outside the outer tube.

[0006] Preferably, the reinforcement mechanism comprises an extrusion mechanism and a flattening ring, and there are no less than two groups of the extrusion mechanism, and a flattening ring is provided at the rear end thereof.

[0007] Preferably, the extrusion mechanism comprises grooves and rollers, and at least two groups of grooves are arranged at equal intervals on the outside of the outer tube, and a group of rollers are connected to each of the grooves.

[0008] Preferably, the grooves of the front and rear groups of the squeezing mechanisms and the roller installation positions are staggered.

[0009] Preferably, the outer side of the roller and the outer side of the leveling ring are in the same horizontal plane.

[0010] Preferably, the front end of the outer tube and the front end of the flattening ring are both configured as inclined surfaces.

[0011] Preferably, an hourglass-shaped through groove is provided in the inlet pipe.

[0012] Preferably, the working area of ​​the drill bit is larger than the opening area of ​​the front end of the inlet pipe.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] A main body pipe is provided, a drill bit is connected to the front end of the main body pipe, and drilling can be performed. An outer pipe is provided on the outside of the main body pipe, and no less than two groups of reinforcement mechanisms are provided at equal intervals on the outside of the outer pipe. The reinforcement mechanism includes an extrusion mechanism and a leveling ring. The crushed materials during drilling by the drill bit can be squeezed onto the inner wall of the hole through the extrusion mechanism, so that the structural density of the inner wall of the hole is increased, the soil is more compact, and its overall strength can be effectively enhanced, so as to avoid hole collapse, improve safety, and facilitate subsequent operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal front end structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the extrusion mechanism of the utility model.

[0018] In the figure: main tube-1, drill bit-2, outer tube-3, reinforcement mechanism-4, inlet tube-11, outlet-12, drive shaft-21, transmission arm-22, extrusion mechanism-41, leveling ring-42, groove-411, roller-412. DETAILED DESCRIPTION

[0019] In order to further explain the technical solution of the present utility model, it is described in detail through specific embodiments below.

[0020] See also Figure 1-2 The utility model provides a soft coal seam extraction drilling device, including a main body pipe 1, a group of inlet pipes 11 are connected to the front end of the main body pipe 1, and at least two groups of discharge ports 12 are arranged at equal intervals outside the rear end of the inlet pipe 11 near the main body pipe 1, wherein an hourglass-shaped through groove is arranged inside the inlet pipe 11, which can receive the broken soil generated when the drill bit 2 is working, and is discharged to the outside of the main body pipe 1 through the discharge port 12, and a driving shaft 21 is arranged at the middle end of the main body pipe 1, and a group of transmission arms 22 are connected to the front end of the driving shaft 21, and the transmission arm 22 The front end extends through to the front end of the inlet pipe 11 and is connected to a group of drill bits 2. The working area of ​​the drill bit 2 is larger than the opening area of ​​the front end of the inlet pipe 11, which is conducive to the movement of the inlet pipe 11 to store debris. The rotation of the drive shaft 21 can drive the drill bit 2 to rotate through the transmission arm 22, and the outer side of the transmission arm 22 is provided with convex patterns, which can re-crush the debris passing through the inner groove of the inlet pipe 11 to reduce its volume and avoid clogging the discharge port 12. An outer tube 3 is provided on the outside of the main tube 1, and no less than two groups of reinforcement mechanisms 4 are provided at equal intervals on the outside of the outer tube 3.

[0021] See also Figure 1-3 The utility model provides a soft coal seam extraction drilling device, the reinforcement mechanism 4 includes a squeezing mechanism 41 and a leveling ring 42, the squeezing mechanism 41 has no less than two groups, and the rear end thereof is provided with a leveling ring 42;

[0022] The extrusion mechanism 41 includes grooves 411 and rollers 412. No less than two groups of grooves 411 are arranged at equal intervals on the outside of the outer tube 3. A group of rollers 412 are connected to each of the grooves 411. The debris soil discharged from the discharge port 12 can be pressed into the inner wall of the channel through the rollers 412. The installation positions of the grooves 411 and rollers 412 of the front and rear groups of extrusion mechanisms 41 are staggered, which can increase the coverage area and ensure uniform channel strength. The outer side of the roller 412 and the outer side of the leveling ring 42 are in the same horizontal plane, and the inner wall of the channel can be leveled and then squeezed through the outer side of the leveling ring 42. The front end of the outer tube 3 and the front end of the leveling ring 42 are both set as inclined surfaces, which is conducive to the passage of debris soil.

[0023] Here’s how it works:

[0024] When in use, the driving shaft 21 can be used to drive the transmission arm 22 and the drill bit 2 to rotate and drill holes. The debris soil generated during the drilling process can be discharged from the discharge port 12 after passing through the through groove in the inlet pipe 11, and contact the roller 412 along the outer tube 3. The roller 412 can press the debris soil into the inner wall of the channel, and level it and squeeze it through the outer side of the leveling ring 42, so that the structural density of the inner wall of the channel increases, the soil is more compact, the overall strength is improved, and the collapse of the channel can be avoided.

[0025] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A soft coal seam extraction drilling device, characterized in that: The invention comprises a main body tube (1), the front end of the main body tube (1) is connected to a group of inlet tubes (11), the outer rear end of the inlet tube (11) is provided with at least two groups of discharge ports (12) at equal intervals near the main body tube (1), the middle end of the main body tube (1) is provided with a drive shaft (21), the front end of the drive shaft (21) is connected to a group of transmission arms (22), the front end of the transmission arm (22) extends through to the front end of the inlet tube (11) and is connected to a group of drill bits (2), the outer side of the main body tube (1) is provided with an outer tube (3), and the outer side of the outer tube (3) is provided with at least two groups of reinforcement mechanisms (4) at equal intervals.

2. A soft coal seam extraction drilling device according to claim 1, characterized in that: The reinforcement mechanism (4) comprises an extrusion mechanism (41) and a flattening ring (42). The extrusion mechanism (41) comprises no less than two groups, and a flattening ring (42) is provided at the rear end thereof.

3. A soft coal seam extraction drilling device according to claim 2, characterized in that: The extrusion mechanism (41) comprises grooves (411) and rollers (412). The outer side of the outer tube (3) is provided with at least two groups of grooves (411) at equal intervals, and each of the grooves (411) is connected to a group of rollers (412).

4. A soft coal seam extraction drilling device according to claim 3, characterized in that: The installation positions of the grooves (411) and the rollers (412) of the front and rear groups of the squeezing mechanisms (41) are staggered.

5. A soft coal seam extraction drilling device according to claim 3, characterized in that: The outer side of the roller (412) and the outer side of the leveling ring (42) are in the same horizontal plane.

6. A soft coal seam extraction drilling device according to claim 5, characterized in that: The front end of the outer tube (3) and the front end of the flattening ring (42) are both configured as inclined surfaces.

7. A soft coal seam extraction drilling device according to claim 1, characterized in that: An hourglass-shaped through groove is provided in the inlet pipe (11).

8. The soft coal seam extraction drilling device according to claim 1, characterized in that: The working area of ​​the drill bit (2) is larger than the front end opening area of ​​the inlet pipe (11).

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