A kind of back circulation down-the-hole drill's discharge assembly

Abstract

The application provides a kind of back circulation down-the-hole drill's discharge assembly, belong to the technical field of drilling rig, including rotary power head and backflush device;Rotary power head is connected with discharge pipeline;One end of discharge pipeline is connected with discharge pipeline, the other end of discharge pipeline is connected with double-wall drill pipe, the lowermost double-wall drill pipe is connected with impactor;Impactor, double-wall drill pipe and discharge pipeline are all provided with gas path and discharge passage, the end of impactor has gas outlet and slag port, gas path and discharge passage are independent of each other;Backflush device includes valve and backflush pipeline;Valve is connected on discharge pipeline, and discharge pipeline is divided into two parts;Two parts of discharge pipeline are provided with backflush pipeline;Through the above setting, the scum in discharge pipeline and discharge passage can be blown out, the scum adhered in discharge pipeline and discharge passage is reduced, and then the situation that scum blocks discharge passage is reduced.

Description

Technical Field

[0001] This application belongs to the field of drilling rig technology, specifically relating to a slag removal assembly for a reverse circulation down-the-hole drill. Background Technology

[0002] A reverse circulation down-the-hole drill is a type of drilling machine that uses pump-suction reverse circulation technology. It breaks up soil and rock through the high-frequency vibration and cutting force of the drill bit, and uses high-pressure water or high-pressure air to transport the rock cuttings to the surface in reverse.

[0003] When a reverse circulation down-the-hole drill rig stops operating, slag will remain in the slag discharge channel. Because the slag contains moisture, it is quite damp and will adhere to the inner wall of the slag discharge channel. As the downtime increases, the slag will stick tightly to the inner wall of the slag discharge channel, making it difficult to clean and easily clogging the slag discharge channel, thus affecting the subsequent slag discharge effect. Utility Model Content

[0004] This application provides a slag removal assembly for a reverse circulation down-the-hole drill, which aims to reduce the amount of slag adhering to the inner wall of the slag removal channel after the reverse circulation down-the-hole drill stops operating.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A slag removal assembly for a reverse circulation down-the-hole drill rig is provided, comprising: A rotary power head is connected to a slag discharge pipe; one end of the slag discharge pipe is connected to a slag outlet pipe, and the other end of the slag discharge pipe is connected to a double-walled drill rod. An impactor is connected to the lowest double-walled drill rod; air passages and slag discharge passages are provided on the impactor, the double-walled drill rod, and the slag discharge pipe. The end of the impactor has an air outlet and a slag outlet. The air passage and the slag discharge passage are independent of each other. The backflushing device includes a valve and a backflushing pipe; the valve is connected to the slag discharge pipe, dividing the slag discharge pipe into two parts; both parts of the slag discharge pipe are equipped with backflushing pipes; during the slag discharge process, the valve is in the open state and the backflushing pipe is in the closed state; when drilling stops, the valve is in the closed state and the backflushing pipe is in the open state to backflush the floating slag in the slag discharge passage and the slag discharge pipe.

[0006] In one possible implementation, an air inlet pipe is connected to the slag discharge pipe, the air inlet pipe is sleeved on the slag discharge pipe, and the air inlet pipe is connected to the air passage; the outer peripheral wall of the air inlet pipe has a branch pipe connected to the pressurized gas. The slag discharge pipe has a through hole on its outer peripheral wall that communicates with the air passage, and the through hole is located inside the air inlet pipe; the rotary power head and the air inlet pipe can rotate relative to each other, and the rotary power head and the air inlet pipe are relatively fixed in the axial direction; the slag discharge pipe is connected to the air inlet pipe.

[0007] In one possible implementation, the backflushing pipe is detachably connected to the slag discharge pipe, and the backflushing pipe is detachably provided with a rotating jet structure at one end near the slag discharge pipe, with the jetting end of the rotating jet structure being inclined.

[0008] In one possible implementation, the slag discharge pipe is connected to a threaded sleeve at the location of the backflushing pipe, the outer peripheral wall of the backflushing pipe has external threads, and the backflushing pipe and the threaded sleeve are threadedly engaged; wherein, the backflushing pipe and the threaded sleeve are in a sealing engagement.

[0009] In one possible implementation, a sealing gasket is provided at the end of the backflushing pipe, and after the backflushing pipe is threadedly engaged with the threaded sleeve, the sealing gasket abuts against the end of the backflushing pipe and the end inside the threaded sleeve.

[0010] In one possible implementation, the rotating jet structure includes: A rotating sleeve is connected to an impeller at one end and to a spray pipe at the other end; the spray pipe is inclined. An axial limiting structure is connected inside the backflushing pipe; the axial limiting structure is used to contact both ends of the rotating sleeve to axially limit the rotating sleeve.

[0011] In one possible implementation, the axial limiting structure includes a limiting ring, one end of the rotating sleeve is in contact with the limiting ring; the backflushing pipe has an annular groove at the other end of the rotating sleeve, a retaining spring is disposed in the annular groove, and the retaining spring is in contact with the other end of the rotating sleeve.

[0012] In one possible implementation, the axial limiting structure includes a fixed sleeve, which is fitted inside the backflushing pipe, and the outer end of the fixed sleeve is fixed to the backflushing pipe by bolts; the fixed sleeve is in a sealing fit with the backflushing pipe. The rotating sleeve is rotatably disposed inside the fixed sleeve, and the rotating sleeve is fixed relative to the fixed sleeve in the axial direction.

[0013] In one possible implementation, a positioning ring is connected inside the fixed sleeve, the positioning ring being used to contact one end of the rotating sleeve; the fixed sleeve is provided with a positioning groove at the other end of the rotating sleeve, and a retaining spring is provided in the positioning groove, the retaining spring contacting the other end of the rotating sleeve.

[0014] In one possible implementation, a connecting component is fixedly provided on the outer end of the fixed sleeve, and the end face of the backflushing pipe has a groove for inserting and engaging with the connecting component; the bottom wall of the connecting component and the groove has threaded holes aligned with each other, and the connecting component is fixed to the backflushing pipe by bolts.

[0015] This application provides a slag removal assembly for a reverse circulation down-the-hole drill. Compared with existing technologies, this assembly features an independent air path and slag removal passage, with an air outlet and slag outlet at the end of the impactor. During normal drilling, pressurized gas in the air path is discharged from the air outlet at the end of the impactor, and the drilled waste is blown from the slag outlet to the slag removal passage. The waste is finally discharged from the slag removal pipe. When drilling stops, pressurized gas is stopped from entering the air path. At this time, the valve on the slag removal pipe is closed, and pressurized gas is introduced into the backflushing pipes of both parts of the slag removal pipe. After the pressurized gas enters the slag removal pipe, it can blow out the floating slag in the slag removal pipe and the slag removal passage, reducing the floating slag adhering to the slag removal pipe and the slag removal passage, thereby reducing the occurrence of floating slag clogging the slag removal passage. Attached Figure Description

[0016] Figure 1 A schematic diagram of the slag removal process of a slag removal assembly of a reverse circulation down-the-hole drill provided in an embodiment of this application; Figure 2 A schematic diagram of the backflushing and slag removal of a slag removal assembly of a reverse circulation down-the-hole drill provided in an embodiment of this application; Figure 3 A schematic diagram of the rotary jet structure of the slag removal assembly of a reverse circulation down-the-hole drill provided in an embodiment of this application; Figure 4 A schematic diagram of the connecting component portion of the slag removal assembly of a reverse circulation down-the-hole drill provided in an embodiment of this application; Figure 5 A schematic diagram of the rotating sleeve portion of the slag removal assembly of a reverse circulation down-the-hole drill provided in an embodiment of this application; Figure 6 This is a cross-sectional view of the backflushing pipe portion of a slag discharge assembly for a reverse circulation down-the-hole drill provided in an embodiment of this application.

[0017] Explanation of reference numerals in the attached drawings: 1. Rotary power head; 2. Backflush device; 21. Valve; 22. Backflush pipe; 221. Groove; 23. Rotary jet structure; 231. Rotating sleeve; 232. Impeller; 233. Jet pipe; 234. Fixed sleeve; 235. Connecting component; 236. Positioning ring; 237. Positioning groove; 3. Slag discharge pipe; 31. Air passage; 32. Slag discharge passage; 33. Air inlet pipe; 34. Branch pipe; 4. Slag discharge pipe; 41. Threaded sleeve; 5. Double-walled drill rod; 6. Impactor. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] Please refer to the following: Figures 1 to 6 This application describes a slag removal assembly for a reverse circulation down-the-hole drill. The slag removal assembly includes a rotary power head 1 and a backflushing device 2. The rotary power head 1 is connected to a slag removal pipe 3. One end of the slag removal pipe 3 is connected to a slag discharge pipe 4, and the other end is connected to a double-walled drill rod 5. An impactor 6 is connected to the lowest double-walled drill rod 5. Air passages 31 and slag removal passages 32 are provided on the impactor 6, the double-walled drill rod 5, and the slag removal pipe 3. The end of the impactor 6 has an air outlet and a slag outlet. The air passage 31 connects to the slag discharge pipe 3. The passages 32 are independent of each other; the backflushing device 2 includes a valve 21 and a backflushing pipe 22; the valve 21 is connected to the slag discharge pipe 4, dividing the slag discharge pipe 4 into two parts; both parts of the slag discharge pipe 4 are equipped with backflushing pipes 22; during the slag discharge process, the valve 21 is in the open state and the backflushing pipe 22 is in the closed state; when drilling stops, the valve 21 is in the closed state and the backflushing pipe 22 is in the open state to backflush out the floating slag in the slag discharge passage 32 and the slag discharge pipe 4.

[0020] This application provides a slag removal assembly for a reverse circulation down-the-hole drill. Compared with the prior art, it sets up an independent air passage 31 and a slag removal passage 32, and sets an air outlet and a slag outlet at the end of the impactor 6. During normal drilling, the pressurized gas in the air passage 31 is discharged from the air outlet at the end of the impactor 6 along the air passage 31, and then the drilled waste is blown from the slag outlet to the slag removal passage 32. The waste is finally discharged from the slag removal pipe 4. When drilling stops, the pressurized gas is stopped from being supplied to the air passage 31. At this time, the valve 21 on the slag removal pipe 4 is closed, and pressurized gas is supplied to the backflushing pipes 22 of the two parts of the slag removal pipe 4. After the pressurized gas enters the slag removal pipe 4, it can blow out the floating slag in the slag removal pipe 4 and the slag removal passage 32, reducing the floating slag adhering to the slag removal pipe 4 and the slag removal passage 32, thereby reducing the situation of floating slag clogging the slag removal passage 32.

[0021] In some embodiments, such as Figures 1 to 6 As shown, an air inlet pipe 33 is connected to the slag discharge pipe 3. The air inlet pipe 33 is sleeved on the slag discharge pipe 3 and is connected to the air passage 31. The outer peripheral wall of the air inlet pipe 33 has a branch pipe 34 that is connected to the pressurized gas. Both the branch pipe 34 and the backflushing pipe 23 are equipped with valves. The outer peripheral wall of the slag discharge pipe 3 has a through hole that is connected to the air passage 31. The through hole is located inside the air inlet pipe 33. The rotary power head 1 and the air inlet pipe 33 can rotate relative to each other. In the axial direction, the rotary power head 1 and the air inlet pipe 33 are relatively fixed. The slag discharge pipe 4 is connected to the air inlet pipe 33.

[0022] It should be noted that the connection between the slag discharge pipe 3, the air inlet pipe 33, and the rotary power head 1 is existing technology and will not be described in detail here. During drilling, the rotary power head 1 drives the double-wall drill rod 5 to rotate, while the air inlet pipe 33 and the slag discharge pipe 4 do not rotate. The waste material blown up from the slag discharge passage 32 is discharged from the slag discharge pipe 4. After drilling stops, the slag in the slag discharge pipe 4 and the slag discharge passage 32 is flushed out of the slag discharge pipe 4 and the slag discharge passage 32, reducing the slag adhering to the slag discharge passage 32 and the slag discharge pipe 4.

[0023] In some embodiments, such as Figures 1 to 6 As shown, the backflushing pipe 22 is detachably connected to the slag discharge pipe 4. The backflushing pipe 22 is detachably provided with a rotary jet structure 23 at one end near the slag discharge pipe 4. The jetting end of the rotary jet structure 23 is inclined. The rotary jet structure 23 includes a rotary sleeve 231 and an axial limiting structure. One end of the rotary sleeve 231 is connected to an impeller 232, and the other end is connected to a jet pipe 233. The jet pipe 233 is inclined. The axial limiting structure is connected inside the backflushing pipe 22. The axial limiting structure is used to contact both ends of the rotary sleeve 231 to axially limit the rotary sleeve 231.

[0024] By making the backflushing pipe 22 and the slag discharge pipe 4 detachably connected, the backflushing pipe 22 can be removed from the slag discharge pipe 4, thereby enabling maintenance and replacement of the backflushing pipe 22. By setting a rotating jet structure 23 inside the backflushing pipe 22, when pressurized gas is introduced into the backflushing pipe 22, the pressurized gas can drive the impeller 232 to rotate, thereby driving the rotating sleeve 231 to rotate, so that the jet pipe 233 rotates around the axis of the backflushing pipe 22, increasing the range of direct jetting of the jet pipe 233, and blowing out the floating slag in the slag discharge pipe 4 and the slag discharge passage 32.

[0025] Because the injection pipe 233 is inclined, the injection range can be increased during the rotation of the injection pipe 233; the rotating sleeve 231 is installed in the backwash pipe 22 and the rotating sleeve 231 is limited by the axial limiting structure. During the rotation of the rotating sleeve 231 in the backwash pipe 22, the rotating sleeve 231 will not slide axially, ensuring the stability of the rotating sleeve 231; the end extension range of the injection pipe 233 is within the range enclosed by the inner diameter of the backwash pipe 22, so no interference will occur during the installation and rotation of the injection pipe 233.

[0026] In some embodiments, such as Figures 1 to 6As shown, a threaded sleeve 41 is connected to the backflushing pipe 22 at the position of the slag discharge pipe 4. The outer peripheral wall of the backflushing pipe 22 has external threads, and the backflushing pipe 22 and the threaded sleeve 41 are threadedly engaged. The backflushing pipe 22 and the threaded sleeve 41 are sealed together. A sealing gasket is provided at the end of the backflushing pipe 22. After the backflushing pipe 22 and the threaded sleeve 41 are threadedly engaged, the sealing gasket abuts against the end of the backflushing pipe 22 and the end inside the threaded sleeve 41.

[0027] By setting a threaded sleeve 41 on the outer peripheral wall of the slag discharge pipe 4, and providing a through hole at the position of the threaded sleeve 41, the diameter of the through hole at the bottom of the threaded sleeve 41 is smaller than the inner diameter of the threaded sleeve 41; therefore, after the backflushing pipe 22 and the threaded sleeve 41 are threadedly engaged, the end of the backflushing pipe 22 abuts against the bottom of the threaded sleeve 41.

[0028] By setting a sealing gasket (not shown in the figure) at the bottom of the groove of the threaded sleeve 41, after the backflushing pipe 22 is connected to the threaded sleeve 41, the end of the backflushing pipe 22 and the bottom of the groove of the threaded sleeve 41 can fit tightly against the sealing gasket. It should be noted that the sealing gasket is a ring structure, and the inner diameter of the sealing gasket is larger than the outer diameter of the rotating sleeve 231 to avoid the rotating sleeve 231. Therefore, the sealing gasket will not interfere with the normal operation of the rotating sleeve 231.

[0029] In some embodiments, such as Figures 1 to 6 As shown, the axial limiting structure includes a limiting ring, one end of the rotating sleeve 231 is in contact with the limiting ring; the backflushing pipe 22 has an annular groove at the other end of the rotating sleeve 231, and a retaining spring is provided in the annular groove, which is in contact with the other end of the rotating sleeve 231.

[0030] In this embodiment, the rotating sleeve 231 is directly installed inside the backflushing pipe 22, and the outer peripheral wall of the rotating sleeve 231 contacts the inner peripheral wall of the backflushing pipe 22. When the rotating sleeve 231 is placed inside the backflushing pipe 22, the limiting ring inside the backflushing pipe 22 can play a preliminary limiting role on the rotating sleeve 231. Through the cooperation of the snap ring and the annular groove, the other end of the rotating sleeve 231 can be limited, thereby limiting the rotating sleeve 231 on the backflushing pipe 22.

[0031] In some embodiments, such as Figures 1 to 6As shown, the axial limiting structure includes a fixed sleeve 234, which is sleeved inside the backflushing pipe 22. The outer end of the fixed sleeve 234 is fixed to the backflushing pipe 22 by bolts. The fixed sleeve 234 and the backflushing pipe 22 are in a sealing fit. The rotating sleeve 231 is rotatably disposed inside the fixed sleeve 234, and the rotating sleeve 231 is relatively fixed to the fixed sleeve 234 in the axial direction. A connecting component 235 is fixedly provided on the outer end of the fixed sleeve 234. The end face of the backflushing pipe 22 has a groove 221 for insertion and mating with the connecting component 235. The bottom walls of the connecting component 235 and the groove 221 have threaded holes that are aligned with each other. The connecting component 235 and the backflushing pipe 22 are fixed by bolts.

[0032] In this embodiment, the rotating sleeve 231 is installed into the fixed sleeve 234, with the outer peripheral wall of the rotating sleeve 231 contacting the inner peripheral wall of the fixed sleeve 234. Then, the fixed sleeve 234 is installed into the backflushing pipe 22. After the rotating sleeve 231 is installed into the fixed sleeve 234, the fixed sleeve 234 is inserted into the backflushing pipe 22, and the connecting component 235 is inserted into the groove 221 at the end of the backflushing pipe 22. Then, the connecting component 235 is fixed to the backflushing pipe 22 by bolts, thus fixing the fixed sleeve 234 to the backflushing pipe 22.

[0033] The end of the connecting component 235 is coplanar with the end of the fixing sleeve 234, and the depth of the groove 221 is equal to the thickness of the connecting component 235. After the connecting component 235 and the groove 221 are inserted and fitted, the outer end of the connecting component 235 is coplanar with the end of the backflushing pipe 22. The connecting component 235 is provided with a countersunk hole, which allows the bolt nut to be located in the countersunk hole. After the backflushing pipe 22 and the threaded sleeve 41 are threaded together, the sealing gasket covers the bolt position, which can protect the bolt.

[0034] In some embodiments, such as Figures 1 to 6 As shown, a positioning ring 236 is connected inside the fixed sleeve 234, and the positioning ring 236 is used to contact one end of the rotating sleeve 231; the fixed sleeve 234 is provided with a positioning groove 237 at the other end of the rotating sleeve 231, and a retaining spring is provided in the positioning groove 237, which contacts the other end of the rotating sleeve 231.

[0035] When the rotating sleeve 231 is installed into the fixed sleeve 234, the positioning ring 236 contacts one end of the rotating sleeve 231, and then the snap ring is installed into the positioning groove 237. The snap ring limits the other end of the rotating sleeve 231, thus confining the rotating sleeve 231 within the fixed sleeve 234. When pressurized gas is introduced into the backflushing pipe 22, the pressurized gas can drive the rotating sleeve 231 to rotate, thereby causing the injection pipe 233 to rotate and spray, blowing out the slag in the slag discharge pipe and the slag discharge passage 32.

[0036] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A slag removal assembly for a reverse circulation down-the-hole drill, characterized in that, include: A rotary power head is connected to a slag discharge pipe; one end of the slag discharge pipe is connected to a slag outlet pipe, and the other end of the slag discharge pipe is connected to a double-walled drill rod. An impactor is connected to the lowest double-walled drill rod; air passages and slag discharge passages are provided on the impactor, the double-walled drill rod, and the slag discharge pipe. The end of the impactor has an air outlet and a slag outlet. The air passage and the slag discharge passage are independent of each other. The backflushing device includes a valve and a backflushing pipe; the valve is connected to the slag discharge pipe, dividing the slag discharge pipe into two parts; both parts of the slag discharge pipe are equipped with backflushing pipes; during the slag discharge process, the valve is in the open state and the backflushing pipe is in the closed state; when drilling stops, the valve is in the closed state and the backflushing pipe is in the open state to backflush the floating slag in the slag discharge passage and the slag discharge pipe.

2. A debris discharge assembly for a down-the-hole drill as claimed in claim 1, wherein, An air inlet pipe is connected to the slag discharge pipe, and the air inlet pipe is sleeved on the slag discharge pipe and is connected to the air circuit; the outer peripheral wall of the air inlet pipe has a branch pipe that is connected to the pressurized gas. The slag discharge pipe has a through hole on its outer peripheral wall that communicates with the air passage, and the through hole is located inside the air inlet pipe; the rotary power head and the air inlet pipe can rotate relative to each other, and the rotary power head and the air inlet pipe are relatively fixed in the axial direction; the slag discharge pipe is connected to the air inlet pipe.

3. A debris discharge assembly for a down-the-hole drill as defined in claim 1, wherein, The backflushing pipe is detachably connected to the slag discharge pipe. The backflushing pipe is detachably equipped with a rotating spray structure at one end near the slag discharge pipe, and the spray end of the rotating spray structure is inclined.

4. A debris discharge assembly for a down-the-hole drill as claimed in claim 3, wherein, The slag discharge pipe is connected to the backflushing pipe at the position of the backflushing pipe. The outer peripheral wall of the backflushing pipe has external threads, and the backflushing pipe and the threaded sleeve are threadedly engaged; wherein, the backflushing pipe and the threaded sleeve are in a sealing engagement.

5. A debris discharge assembly for a down-the-hole drill as claimed in claim 4, wherein, A sealing gasket is provided at the end of the backflush pipe. After the backflush pipe is threadedly engaged with the threaded sleeve, the sealing gasket abuts against the end of the backflush pipe and the end inside the threaded sleeve.

6. A debris discharge assembly for a down-the-hole drill as defined in claim 3, wherein, The rotary jet structure includes: A rotating sleeve is connected to an impeller at one end and to a spray pipe at the other end; the spray pipe is inclined. An axial limiting structure is connected inside the backflushing pipe; the axial limiting structure is used to contact both ends of the rotating sleeve to axially limit the rotating sleeve.

7. A debris discharge assembly for a down-the-hole drill as claimed in claim 6, wherein, The axial limiting structure includes a limiting ring, one end of the rotating sleeve is in contact with the limiting ring; the backflushing pipe has an annular groove at the other end of the rotating sleeve, a retaining spring is provided in the annular groove, and the retaining spring is in contact with the other end of the rotating sleeve.

8. A debris discharge assembly for a down-the-hole drill as defined in claim 6, wherein, The axial limiting structure includes a fixed sleeve, which is fitted inside the backflushing pipe, and the outer end of the fixed sleeve is fixed to the backflushing pipe by bolts; the fixed sleeve is in a sealing fit with the backflushing pipe. The rotating sleeve is rotatably disposed inside the fixed sleeve, and the rotating sleeve is fixed relative to the fixed sleeve in the axial direction.

9. A debris discharge assembly for a down-the-hole drill as claimed in claim 8, wherein, The fixed sleeve is connected to a positioning ring, which is used to contact one end of the rotating sleeve; the fixed sleeve is provided with a positioning groove at the other end of the rotating sleeve, and a retaining spring is provided in the positioning groove, which contacts the other end of the rotating sleeve.

10. A debris discharge assembly for a down-the-hole drill as defined in claim 8, wherein, The outer end of the fixed sleeve is fixed with a connecting part, and the end face of the backflush pipe has a groove for plug-in cooperation with the connecting part; the connecting part and the bottom wall of the groove have thread holes in alignment with each other, and the connecting part and the backflush pipe are fixed by bolts.

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