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CN-122014102-A - Major diameter pneumatic reverse circulation reaming down-the-hole hammer

CN122014102ACN 122014102 ACN122014102 ACN 122014102ACN-122014102-A

Abstract

The application relates to a large-diameter pneumatic reverse circulation reaming down-the-hole hammer, which belongs to the technical field of geotechnical engineering drilling equipment and comprises a centralizing joint, a check valve, a gas distribution seat, an outer cylinder, an inner cylinder, an adapting pipe, a collecting pipe, a piston, a bushing, a clamping nest, a drill bit and a wear-resistant sleeve. The centralizing joint and the clamping nest are respectively fixed on the two end parts of the outer cylinder, the drill bit is fixed in the clamping nest, the wear-resistant sleeve is sleeved outside the clamping nest, the check valve, the air distribution seat, the inner cylinder, the piston and the bushing are sequentially arranged in the outer cylinder, the adapting pipe is arranged in the centralizing joint in a penetrating manner, the collecting pipe is arranged in the air distribution seat and the piston in a penetrating manner, one end of the collecting pipe is communicated with the adapting pipe, and the other end of the collecting pipe is communicated with the discharging hole in the drill bit. According to the application, the wear-resistant sleeve is arranged, the outer edge of the wear-resistant sleeve is attached to the inner wall of the drill hole, so that the gap between the drill bit and the hole wall is effectively isolated, abnormal abrasion of the drill bit is greatly reduced, and the service life of the drill bit is prolonged.

Inventors

  • ZHOU JING
  • WU HAO
  • XU TIANHAO

Assignees

  • 中煤地第二勘探局集团有限责任公司
  • 中化地质矿山总局贵州地质勘查院

Dates

Publication Date
20260512
Application Date
20260116

Claims (10)

  1. 1. A large-diameter pneumatic reverse-circulation reaming down-hole hammer is characterized by comprising a righting joint (1), a check valve (2), an air distribution seat (3), an outer cylinder (4), an inner cylinder (5), an adapting pipe (6), a collecting pipe (7), a piston (8), a bushing (9), a clamping sleeve (10), a drill bit (11) and a wear-resistant sleeve (12), wherein a first end of the righting joint (1) is communicated with an external drilling machine, a second end of the righting joint (1) penetrates into the outer cylinder (4) and is connected with the outer cylinder (4), the righting joint (1) is provided with a first through hole, the adapting pipe (6) penetrates into the first through hole, the check valve (2) is positioned in the first through hole and sleeved outside the adapting pipe (6), the air distribution seat (3) is positioned in the outer cylinder (4) and contacts the external drilling machine after moving, the air distribution seat (3) is positioned in the outer cylinder (4) and contacts the second through hole, the air distribution seat (5) is provided with a gap between the inner cylinder (5) and the outer cylinder (5), the piston (8) is slidably arranged in the outer cylinder (4), a second gap is formed between the piston (8) and the outer cylinder (4), the bushing (9) is penetrated in the outer cylinder (4), the clamping sleeve (10) is sleeved on the drill bit (11), the clamping sleeve (10) is penetrated on the second end of the outer cylinder (4), the piston (8) slides back and forth between the first end of the drill bit (11) and the second end of the air distribution seat (3), the drill bit (11) is provided with a discharge hole, the collecting pipe (7) is positioned in the outer cylinder (4) and penetrates through the piston (8) and the air distribution seat (3), a third gap is formed between the piston (8) and the collecting pipe (7), two ends of the collecting pipe (7) are respectively communicated with the discharge hole and the adapting (6), the wear-resistant sleeve (12) is sleeved on the outer edge of the clamp (10) and is attached to the outer wall of the drill bit (11), the inner wall (8), the air distribution seat (8) and the air distribution seat (3) are formed between the piston (8) and the inner cylinder (7), the air distribution seat (8) and the air chamber (7), the piston (8) are formed, the exhaust channel is communicated with the front air chamber, and the high-pressure air can carry rock debris to enter the discharge hole after flowing out of the exhaust channel.
  2. 2. The large-diameter pneumatic reverse-circulation reaming down-the-hole hammer of claim 1, further comprising a clamping ring (13), wherein the clamping ring (13) is sleeved on the drill bit (11) and penetrates through the clamping nest (10), and a first end of the clamping ring (13) contacts a second end of the bushing (9).
  3. 3. The large-diameter pneumatic reverse circulation reaming down-the-hole hammer of claim 2, further comprising a check spring (14), wherein the check spring (14) is sleeved outside the adapting pipe (6), a first end of the check spring (14) contacts the check valve (2), and a second end of the check spring (14) contacts the air distribution seat (3).
  4. 4. A large diameter pneumatic reverse circulation reaming down-the-hole hammer as set forth in claim 3, further comprising a washer (15), said washer (15) being located between said centralizing sub (1) and said outer casing (4), said washer (15) also being located between said outer casing (4) and said snap nest (10).
  5. 5. A large diameter pneumatic reverse circulation reaming down-the-hole hammer as claimed in any one of claims 1-4, characterized in that the outer surface of the piston (8) contacts part of the inner surface of the bushing (9) and part of the inner surface of the inner cylinder (5), respectively.
  6. 6. A large-diameter pneumatic reverse circulation reaming down-the-hole hammer as set forth in any one of claims 1-4, wherein the righting joint (1) and the outer cylinder (4) are in threaded connection, and the clamping nest (10) and the outer cylinder (4) are in threaded connection.
  7. 7. A large diameter pneumatic reverse circulation reaming down-the-hole hammer as claimed in any one of claims 1-4, further comprising a disc spring (16), said disc spring (16) being located between said inner cylinder (5) and said righting adaptor (1).
  8. 8. A large diameter pneumatic reverse circulation reaming down-the-hole hammer as claimed in any one of claims 1 to 4, wherein the internal bore of the piston (8) is a stepped bore with a large caliber towards the valve seat (3) and a small caliber towards the drill bit (11).
  9. 9. The large-diameter pneumatic reverse-circulation reaming down-the-hole hammer as set forth in any one of claims 1-4, wherein the discharging hole comprises a plurality of discharging small holes and discharging large holes, wherein the discharging small holes are communicated with the discharging large holes, the discharging large holes are communicated with the collecting pipe (7), and the feeding ends of the discharging small holes are communicated with the surface of the drill bit (11).
  10. 10. A large-diameter pneumatic reverse-circulation reaming down-the-hole hammer as set forth in any one of claims 1-4, wherein the inner diameter of the collection tube (7) is the same as the inner diameter of the adapter tube (6).

Description

Major diameter pneumatic reverse circulation reaming down-the-hole hammer Technical Field The application relates to the technical field of geotechnical engineering drilling equipment, in particular to a large-diameter pneumatic reverse circulation reaming down-the-hole hammer. Background The reverse circulation type down-the-hole hammer is high-efficiency rock-soil drilling equipment integrating impact crushing and reverse circulation deslagging, is widely applied to the fields of geotechnical engineering exploration, mining exploitation, pile foundation construction, geothermal drilling and the like, and is particularly suitable for drilling operations of complex stratum such as hard rock, pebble layers and the like. In the punching of present reverse circulation formula down-the-hole hammer in the major diameter, because the drilling internal diameter is great, consequently the clearance very easily appears between pore wall and the drill bit, when the detritus enters into this clearance, great friction appears between pivoted drill bit and the detritus, and the detritus that has sharp corner can fish tail the lateral wall of drill bit, and then influences the holistic stress distribution of drill bit. This condition not only increases wear on the bit sidewall, but also affects the normal operating condition of the bit, thereby reducing the life of the bit. Thus, a new large diameter reverse circulation down-the-hole hammer is needed. Disclosure of Invention The application provides a large-diameter pneumatic reverse circulation reaming down-hole hammer, which aims to solve the problem that the service life of a drill bit is low when the existing down-hole hammer drills a large-diameter hole. The application provides a large-diameter pneumatic reverse circulation reaming down-the-hole hammer, which adopts the following technical scheme: The large-diameter pneumatic reverse circulation reaming down-hole hammer comprises a righting joint, a check valve, an air distribution seat, an outer cylinder, an inner cylinder, an adapting pipe, a collecting pipe, a piston, a lining, a clamping nest, a drill bit and a wear-resistant sleeve, wherein a first end of the righting joint is communicated with an external drilling machine, a second end of the righting joint penetrates into the outer cylinder and is connected with the outer cylinder, the righting joint is provided with a first through hole, the adapting pipe penetrates into the first through hole, the check valve is positioned in the first through hole and is sleeved outside the adapting pipe, the check valve can block the first through hole after moving, the air distribution seat is positioned in the outer cylinder and contacts with a second end of the adapting pipe, the inner cylinder penetrates into the outer cylinder, the first end of the inner cylinder is abutted with a second end of the righting joint, the inner cylinder is sleeved outside the air distribution seat, a part of the outer edge of the inner cylinder and the inner cylinder is provided with a first through hole, the check valve is positioned in the first through hole and is sleeved outside the outer cylinder, the second through hole is sleeved with the outer cylinder, the piston is respectively, the piston is in the inner cylinder is sleeved with the second through hole, the lining is sleeved with the second end of the adapting pipe, the inner cylinder is sleeved with the second end of the inner cylinder, and the inner cylinder is sleeved with the second through the piston, and the piston is sleeved with the first end of the second through hole, and the piston is respectively, and the piston is sleeved with the piston The gas distribution seat, the piston, the drill bit and a rear gas chamber are formed between the collecting pipes, a front gas chamber is formed between the outer cylinder, the piston and the lining, an exhaust channel is formed by nesting the clamps, the exhaust channel is communicated with the front gas chamber, and high-pressure gas can carry rock debris to enter the discharge hole after flowing out of the exhaust channel. By adopting the technical scheme, the annular gap between the drill hole and the down-the-hole hammer can be effectively blocked by arranging the wear-resistant sleeve and enabling the outer edge of the wear-resistant sleeve to be attached to the inner wall of the drill hole, so that the drill bit side wall is prevented from being worn by rock fragments entering the gap, meanwhile, reverse circulation air flow enters the drill hole space through the exhaust channel and carries the rock fragments to be discharged through the discharge hole, the collecting pipe and the adapting pipe, the real-time cleaning of the surrounding area of the drill bit in the drilling process is realized, the abrasion of the rock fragments to the drill bit is reduced, and the service life and the working stability of the drill bit in large-diameter drilling are remarkably improved