A gas extraction variable-diameter reaming device

Abstract

The application discloses a gas extraction variable-diameter reaming device, which comprises a drill rod body, a front drill bit detachably fixed at one end of the drill rod body, a reaming drilling assembly sleeved on the drill rod body, a flow control adjusting device arranged in the drill rod body, one end of the flow control adjusting device connected with the reaming drilling assembly, a central passage arranged in the drill rod body and communicated with the flow control adjusting device, and an air pressure pump connected outside the central passage.

Description

Technical Field

[0001] This invention belongs to the technical field of gas extraction equipment, specifically a gas extraction variable diameter expansion device. Background Technology

[0002] Gas outbursts are common in coal mines. The fundamental solution to this problem is to reduce the gas content in the coal seam. When ordinary drilling rigs perform directional drilling, the borehole diameter is small, resulting in a lower-than-expected gas concentration in the borehole. However, existing borehole reaming devices require the drill rod to be pulled out and replaced with a larger reaming drill bit for reaming, which is inefficient. Furthermore, the larger borehole diameter requires a greater overall driving torque for the drill rod, making reaming more difficult and prone to jamming.

[0003] Therefore, those skilled in the art have provided a gas extraction variable diameter expansion device to solve the problems mentioned in the background art. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a gas extraction variable diameter reaming device, comprising: a drill rod body, a front drill bit detachably fixed at one end of the drill rod body, a reaming drilling assembly sleeved on the drill rod body, and a flow control device disposed within the drill rod body, one end of the flow control device being connected to the reaming drilling assembly, a central channel being disposed within the drill rod body, the central channel being connected to the flow control device, and an air pressure pump being connected outside the central channel.

[0005] Furthermore, as a preferred embodiment, the flow control and adjustment device includes: an inner cavity tube with multiple discharge chambers distributed circumferentially inside, one side of the discharge chambers being connected to the borehole reaming assembly via a branch pipe, a sealing seat being rotatably fitted onto one end of the inner cavity tube, the sealing seat being provided with an inclined flow channel, and a shaft chamber being fixed inside the drill rod body, the other end of the sealing seat being sealed and connected to the shaft chamber, and the shaft chamber being connected to the central channel.

[0006] Furthermore, as a preferred embodiment, the reaming drilling assembly includes: an outer body that is slidably and detachably sleeved on the drill rod body, a locking screw sleeve rotatably provided at one end of the outer body, a threaded groove provided on the outside of the drill rod body, a plurality of diameter adjustment devices arranged on the outer body, and a rubber inner ring coaxially provided inside the outer body, with each of the diameter adjustment devices sleeved on the outside of the rubber inner ring.

[0007] Furthermore, as a preferred embodiment, the variable diameter adjustment device includes: a pneumatic ring chamber, concentrically arranged within the outer body, with multiple shaft cylinders arranged on the pneumatic ring chamber, one end of each shaft cylinder connected to the pneumatic ring chamber, a pneumatic hole being formed on the inner ring wall of the pneumatic ring chamber and connected to the flow control adjustment device through the pneumatic hole, a plunger slidably disposed within each shaft cylinder, an expansion plate slidably disposed on the outer body, one end of each plunger being connected to the expansion plate, and an inner spring being disposed between the expansion plate and the outer body, such that the expansion plate retracts into the outer body without external force.

[0008] Furthermore, as a preferred embodiment, a pulse pump is also connected to the outside of the central channel of the drill pipe body.

[0009] Furthermore, as a preferred embodiment, the cross-section of the expansion plate is arc-shaped, and the outer edge of the expansion plate is provided with a drilled groove. A telescopic guide rod is connected to the outer body, and one end of the telescopic guide rod is connected to the expansion plate.

[0010] Furthermore, as a preferred embodiment, a positioning screw is also provided in the middle of the expansion plate, a sliding sleeve is fixed to one end of the plunger, one end of the positioning screw slides into the sliding sleeve, and an adjusting sleeve is rotatably provided on the sliding sleeve, the adjusting sleeve being threadedly engaged with the positioning screw.

[0011] Furthermore, preferably, the adjustment range of the expansion plate is from 0 mm to 18 mm.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The present invention mainly involves the disassembly and installation of a borehole reaming assembly on the drill rod body. The borehole reaming assembly can rotate with the drill rod body to ream the borehole. In particular, under the control of the flow control device, the borehole reaming assembly can rotate to enter or exit the borehole, avoiding internal jamming. Furthermore, the borehole reaming assembly can continuously provide radial pulse pressure to the inner wall of the borehole during the borehole reaming process, thereby improving the coal breaking effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the flow control and regulation device in this invention;

[0016] Figure 3 This is a schematic diagram of the hole-reaming drilling assembly in this invention;

[0017] Figure 4 This is a schematic diagram of the variable diameter adjustment device in this invention;

[0018] Figure 5This is a schematic diagram of the adjusting sleeve in this invention;

[0019] In the diagram: 1. Drill rod body; 11. Front drill bit; 12. Central channel; 2. Reaming drilling assembly; 21. Outer body; 22. Locking sleeve; 23. Rubber inner ring; 3. Flow control device; 31. Inner cavity tube; 32. Branch pipe; 33. Sealing seat; 34. Inclined flow channel; 35. Shaft chamber; 4. Variable diameter adjustment device; 41. Air pressure ring chamber; 42. Air pressure hole; 43. Expanding plate; 44. Shaft cylinder; 45. Plunger; 46. Sliding sleeve; 47. Positioning screw; 48. Adjusting sleeve; 49. Telescopic guide rod. Detailed Implementation

[0020] Please see Figure 1 In this embodiment of the invention, a gas extraction variable diameter reaming device includes: a drill rod body 1, one end of which is detachably fixed with a front drill bit 11; a reaming drilling assembly 2 is sleeved on the drill rod body 1; and a flow control adjustment device 3 is provided inside the drill rod body 1, one end of which is connected to the reaming drilling assembly 2; a central channel 12 is provided inside the drill rod body 1, which is connected to the flow control adjustment device 3; and an air pressure pump (not shown in the figure) is also connected outside the central channel 12. In other words, the flow control adjustment device can arbitrarily adjust the radial expansion length of the reaming drilling assembly, thereby effectively controlling the reaming distance, improving reaming accuracy, and providing high selectivity.

[0021] In this embodiment, the flow control device 3 includes: an inner cavity tube 31, which has multiple discharge chambers distributed circumferentially inside. One side of each discharge chamber is connected to the reaming drilling assembly 2 via a branch pipe 32. One end of the inner cavity tube 31 is rotatably fitted with a sealing seat 33, which can be driven by a built-in motor in the drill rod body. The sealing seat is provided with an inclined flow channel 34, which can be sealed and connected to each discharge chamber. A shaft chamber 35 is fixed inside the drill rod body 1. The other end of the sealing seat 33 is sealed and connected to the shaft chamber 35. The shaft chamber 35 is connected to the central channel 12. That is, the air pump can pressurize and exhaust gas into the shaft chamber. At this time, the shaft chamber can be transported to the corresponding branch pipe by the rotation of the sealing seat, and then the branch pipe can transport the gas to the reaming drilling assembly.

[0022] In a preferred embodiment, the reaming drilling assembly 2 includes: an outer body 21, which is slidably and detachably sleeved on the drill rod body 1. One end of the outer body 21 is rotatably provided with a locking screw sleeve 22. The drill rod body 1 is provided with a threaded groove to facilitate the disassembly, replacement, cleaning, and maintenance of the reaming drilling assembly. Multiple diameter adjustment devices 4 are arranged on the outer body 21, and a rubber inner ring 23 is coaxially arranged inside the outer body 21. Each diameter adjustment device 4 is sleeved on the outside of the rubber inner ring 23. The most optimal diameter adjustment devices 4 can be arranged in three groups, and each group of diameter adjustment devices 4 is finely adjusted by a flow control adjustment device so that each group of diameter adjustment devices has a different reaming size.

[0023] In this embodiment, the variable diameter adjustment device 4 includes: a pneumatic ring chamber 41, which is concentrically arranged inside the outer body 21. Multiple shaft cylinders 44 are arranged on the pneumatic ring chamber 41. One end of each shaft cylinder 44 is connected to the pneumatic ring chamber 41. A pneumatic hole 42 is opened on the inner ring wall of the pneumatic ring chamber 41 and is connected to the flow control adjustment device 3 through the pneumatic hole 42. A plunger 45 is slidably arranged inside each shaft cylinder 44. An expansion plate 43 is slidably arranged on the outer body 21. One end of each plunger 45 is connected to the expansion plate 43. An inner spring is provided between the expansion plate 43 and the outer body 21, so that the expansion plate 43 retracts into the outer body 21 without external force. The airflow in the pneumatic ring chamber flows into the shaft cylinders, thereby pushing the expansion plate out by the plunger to realize the diameter expansion drilling.

[0024] In this embodiment, a pulse pump (not shown in the figure) is also connected to the outside of the central channel 12 of the drill rod body 1. Especially for boreholes with high coal and rock hardness, the pulse pump continuously supplies high-frequency air (i.e., high flow rate air supply and exhaust) to one of the diameter adjustment devices, so that the expansion plate in the diameter adjustment device can continuously expand and contract, thereby achieving the pre-breaking effect of coal and reducing the wear of the expansion plate.

[0025] In this embodiment, the cross-section of the expansion plate 43 is arc-shaped, and the outer edge of the expansion plate 43 is provided with a drilling groove. The outer body 21 is connected with a telescopic guide rod 49. One end of the telescopic guide rod 49 is connected to the expansion plate 43. One of the telescopic guide rods can be set to a fixed length, so that the expansion plate can not be completely convex, forming another hole expansion drilling shape.

[0026] In a preferred embodiment, a positioning screw 47 is also provided in the middle of the expansion plate 43, a sliding sleeve 46 is fixed at one end of the plunger 45, one end of the positioning screw 47 slides into the sliding sleeve 46, and an adjusting sleeve 48 is rotatably provided on the sliding sleeve 46, and the adjusting sleeve 48 is threadedly engaged with the positioning screw 47.

[0027] In this embodiment, the adjustment range of the expansion plate 43 is from 0mm to 18mm. In particular, the initial mounting point of the expansion plate of each set of variable diameter adjustment devices can be adjusted by adjusting the adjustment sleeve, so that the expansion plates are arranged in a stepped manner or at the same height during subsequent adjustments.

[0028] Specifically, the initial setting point of the expansion plate of each set of diameter adjustment devices is determined according to the hardness of the coal and rock borehole and the expansion range. During drilling, the radial expansion of each diameter adjustment device can be controlled at any time by the flow control adjustment device (that is, it can be carried out during the rotation of the drill rod). In particular, a pulse pump can be used to continuously supply high-frequency gas to one of the diameter adjustment devices, thereby achieving the coal breaking effect and strong borehole expansion effect.

[0029] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gas extraction orifice expansion device with variable diameter, characterized in that: The system includes a drill rod body (1), one end of which is detachably fixed with a front drill bit (11). A hole-reaming drilling assembly (2) is sleeved on the drill rod body (1), and a flow control device (3) is provided inside the drill rod body (1). One end of the flow control device (3) is connected to the hole-reaming drilling assembly (2). A central channel (12) is provided inside the drill rod body (1), and the central channel (12) is connected to the flow control device (3). An air pressure pump is also connected outside the central channel (12). The flow control device (3) includes an inner tube (31), and multiple discharge chambers are distributed circumferentially inside the inner tube (31). One side of the discharge chamber is connected to the borehole drilling assembly (2) through a branch pipe (32). A sealing seat (33) is rotatably sleeved on one end of the inner tube (31). An inclined flow channel (34) is provided on the sealing seat. A shaft chamber (35) is fixed inside the drill rod body (1). The other end of the sealing seat (33) is sealed and connected to the shaft chamber (35). The shaft chamber (35) is connected to the central channel (12). The reaming drilling assembly (2) includes: an outer body (21) which is slidably and detachably sleeved on the drill rod body (1), and multiple diameter adjustment devices (4) are arranged on the outer body (21); The variable diameter adjustment device (4) includes: a pneumatic ring chamber (41) arranged concentrically inside the outer body (21), a plurality of shaft cylinders (44) arranged on the pneumatic ring chamber (41), one end of the shaft cylinder (44) being connected to the pneumatic ring chamber (41), a pneumatic hole (42) being opened on the inner ring wall of the pneumatic ring chamber (41), and being connected to the flow control adjustment device (3) through the pneumatic hole (42), a plunger (45) being slidably arranged inside each shaft cylinder (44), an expansion plate (43) being slidably arranged on the outer body (21), one end of the plunger (45) being connected to the expansion plate (43), and an inner spring being arranged between the expansion plate (43) and the outer body (21), so that the expansion plate (43) retracts into the outer body (21) without external force; A positioning screw (47) is also provided in the middle of the expansion plate (43). A sliding sleeve (46) is fixed at one end of the plunger (45). One end of the positioning screw (47) slides into the sliding sleeve (46). An adjusting sleeve (48) is rotatably provided on the sliding sleeve (46). The adjusting sleeve (48) is threadedly engaged with the positioning screw (47).

2. The gas extraction diameter-changing and expanding orifice device according to claim 1, characterized in that: The reaming drilling assembly (2) also includes a locking sleeve (22), which is rotatably disposed at one end of the outer body (21). The drill rod body (1) is provided with a threaded groove, and a rubber inner ring (23) is coaxially disposed inside the outer body (21). Each of the diameter adjustment devices (4) is sleeved on the outside of the rubber inner ring (23).

3. The gas extraction diameter-changing and expanding orifice device according to claim 1, characterized in that: A pulse pump is also connected to the outside of the central channel (12) of the drill rod body (1).

4. A gas extraction diameter-changing and expanding orifice device according to claim 1, characterized in that: The cross-section of the expansion plate (43) is arc-shaped, and the outer edge of the expansion plate (43) is provided with a drilled groove. The outer body (21) is connected with a telescopic guide rod (49), and one end of the telescopic guide rod (49) is connected to the expansion plate (43).

5. A gas extraction orifice expansion device according to claim 1, characterized in that: The adjustment range of the expansion plate (43) is from 0 mm to 18 mm.

Images