CN211201769U - Down-the-hole hammer reverse circulation follow pipe drill bit suitable for large-diameter drilling - Google Patents
Down-the-hole hammer reverse circulation follow pipe drill bit suitable for large-diameter drilling Download PDFInfo
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- CN211201769U CN211201769U CN201922458317.0U CN201922458317U CN211201769U CN 211201769 U CN211201769 U CN 211201769U CN 201922458317 U CN201922458317 U CN 201922458317U CN 211201769 U CN211201769 U CN 211201769U
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Abstract
The utility model discloses a down-the-hole hammer reverse circulation is with pipe drill bit suitable for major diameter drilling, including last drill bit body and lower drill bit body, wherein lower drill bit body is hung in the lower part of last drill bit body, the centre channel has all been seted up to the middle part of going up drill bit body and lower drill bit body, the lower part of going up the drill bit body is seted up flutedly, the top of lower drill bit body is provided with the protruding axle, the recess is corresponding with the shape of protruding axle, the protruding axle is inserted and is established in the recess, the aperture of recess is greater than the external diameter of protruding axle, the protruding axle can slide in the recess, when the protruding axle slides and supports when leaning on the one end to the recess, thereby lower drill bit body bottom shifts out the. Has the advantages that: the hole bottom double slag suction channels are arranged and matched with the drill bit bottom involute type slag discharge guide groove, the reverse circulation efficiency is high, the down-the-hole hammer impact energy efficiency is high, the slag discharge effect is good, meanwhile, the drill bit bottom edge spherical teeth are arranged in an encrypted mode, good slag discharge conditions are combined, and the service life of the drill bit is effectively prolonged.
Description
Technical Field
The utility model relates to a down-the-hole hammer reverse circulation is with pipe drill bit, in particular to down-the-hole hammer reverse circulation is with pipe drill bit suitable for major diameter drilling.
Background
At present, in the geotechnical drilling and excavating engineering, complex strata such as broken, loose, leakage, gravel and the like are frequently encountered, and the engineering pile hole, especially the large-diameter pile hole, is constructed under the conditions of high drilling difficulty, long construction period, low hole forming efficiency and frequent hole accidents. The down-the-hole hammer following drilling technology is a drilling method combining with an air down-the-hole hammer to expand bottom and drill a drill hole with a diameter slightly larger than that of a casing pipe at the front end of a casing pipe shoe during drilling, and the down-the-hole hammer simultaneously hammers the casing pipe shoe to enable the casing pipe to follow synchronously, so that the purposes of protecting the hole wall of the drill hole and preventing hole collapse and hole collapse are achieved. When the casing follows the complete stratum, the bottom-expanding drill bit retracts and retracts to be lifted out of the casing, so that the broken and complex stratum can be smoothly passed. The down-the-hole hammer pipe-following drilling technology is widely applied to construction of engineering pile holes due to excellent performance, high drilling efficiency and high hole forming quality. The existing down-the-hole hammer casing bit can be divided into a double-bit form with a casing bit and a hole expanding bit form without the casing bit according to the bit form, wherein the double-bit form casing bit is used for drilling, the stratum adaptability is high, the drilling quality is good, the drilling is stable, but the casing bit cannot be replaced, so the drilling depth is limited, and once the casing bit is seriously abraded, the drilling cannot be carried out. The reaming casing following drill bit can realize reaming drilling through the expanding mechanism during drilling, and the drill bit can be withdrawn to be freely lifted out of the hole after the drilling is finished, but the diameter reducing mechanism of the reaming drill bit is that the drilling tool is rotated or pulled to realize diameter reducing under the action of drilling pressure and friction force no matter the reaming drill bit is of an eccentric type, a flap type or a reaming wing type. Under the condition of a complex stratum, the drill rod of the drilling tool is easy to be unscrewed due to blockage and blocking of the variable diameter mechanism caused by rock powder and rock debris or large rotation angle. Once the reducing mechanism fails, major hole accidents are caused, the processing difficulty is high, and the engineering progress and the economic cost are seriously influenced. In addition, in view of the circulation mode of the large-diameter down-the-hole hammer, the positive circulation mode has the problems of incomplete slag discharge, unclean hole bottom, large air quantity, high cost and the like. Therefore, the down-the-hole hammer reverse circulation pipe following drill bit for large-diameter drilling is designed, a hole expanding drill bit form is adopted, the structure of the drill bit is improved, the reliability and the safety of a reducing mechanism under a complex working condition are improved, and the slag discharging effect, the service life of the drill bit and the drilling efficiency are improved.
Disclosure of Invention
The utility model aims at solving the problems that the construction difficulty is large, the construction period is long, the efficiency is lower and the accident is multiple, which are faced by the existing large-diameter engineering pile constructed on the complex stratum, and providing a down-the-hole hammer reverse circulation following drill bit suitable for large-diameter drilling.
The utility model provides a down-the-hole hammer reverse circulation is with tub drill bit suitable for major diameter drilling is including last drill bit body and lower drill bit body, wherein lower drill bit body hangs the lower part at last drill bit body, the central channel has all been seted up to the middle part of going up drill bit body and lower drill bit body, the lower part of going up the drill bit body is seted up flutedly, the top of lower drill bit body is provided with the protruding axle, the recess is corresponding with the shape of protruding axle, the protruding axle is inserted and is established in the recess, the aperture of recess is greater than the external diameter of protruding axle, the protruding axle can slide in the recess, when the protruding axle slides and supports when leaning on the one end of recess, thereby lower drill bit body bottom shifts out the.
The upper portion of going up the drill bit body is provided with the spline, it is connected with pneumatic down-the-hole hammer impacter through the spline to go up the drill bit body, set up several penetrating injection pore on the lateral wall of the drill bit body on the inslot of spline, several injection pore all are linked together with the central channel of last drill bit body middle part, it still covers and is equipped with the casing shoe on the drill bit body to go up, be provided with interior step on the inside wall of casing shoe lower part, be provided with on the last drill bit body lateral wall of the position that corresponds with interior step and hang the boss, go up between drill bit body and the casing shoe through interior step and hang the boss looks joint, it is equipped with the fixed pin to insert on the lateral wall.
The side wall of the upper drill bit body is also provided with a slag suction channel, the inlet of the slag suction channel is positioned at the bottom of the upper drill bit body, and the outlet of the slag suction channel is communicated with the central channel in the middle of the upper drill bit body.
The lower drill bit body is provided with a shoulder, the bottom of the upper drill bit body is abutted against the shoulder, an arc-shaped groove is formed in the position, corresponding to the fixing pin, of the lower drill bit body, the fixing pin on the upper drill bit body is inserted into the arc-shaped groove, the lower drill bit body can slide in the track of the arc-shaped groove, a cutting surface is arranged on one side of the lower part of the lower drill bit body, hard alloy spherical teeth are embedded in the bottom of the lower drill bit body, the bottom of the lower drill bit body is further provided with a plurality of slag discharge guide grooves, and outlets of the slag discharge guide grooves are communicated with inlets of intermediate channels in the.
The slag discharge guide grooves are arranged around the inlet of the central channel at the bottom of the lower drill bit body in an involute form.
The groove at the lower part of the upper drill bit body is a long circular groove taking a circular arc line as a symmetrical axis, and the shape of the convex shaft at the upper part of the lower drill bit body corresponds to the shape of the long circular groove.
The hard alloy spherical teeth at the bottom of the lower drill bit body are embedded in a full-covering and cross mode along a rotary cutting path, meanwhile, the hard alloy spherical teeth are embedded on the side edge of the bottom edge of the lower drill bit body, and the hard alloy spherical teeth are embedded in the rotary extending part at the bottom of the lower drill bit body in a sealing mode.
The top end of the casing shoe is connected with the casing through a screw thread.
The utility model discloses a theory of operation:
the utility model provides a down-the-hole hammer reverse circulation is with tub drill bit when creeping into, and the gyration effect that the rig produced passes through the spline and drives the drill bit body gyration to the drill bit body rotates in step under the drive, and compressed air drives the pneumatic down-the-hole hammer motion simultaneously, and the percussion effect of production transmits to the drill bit body down through last drill bit body, under strikeing and gyration combined action, and the carbide button begins work grinding rock and creeps into. Under the action of cutting resistance and friction, the convex shaft on the upper portion of the lower drill bit body rotates along the arc-shaped groove track in the groove on the lower portion of the upper drill bit body, gradually rotates to extend out of the outer edge of the drill bit and is constrained by the sizes of the convex shaft and the groove, the convex shaft rotates for a small angle and then is attached to one end of the groove to reach the displacement limit, and at the moment, the maximum rotary diameter is larger than the diameter of the sleeve, so that reaming drilling is realized. The counterbore size can be controlled by varying the stub shaft and groove size. The reamer bit drives the sleeve to move downwards together through the sleeve shoe. When the drill bit is completely opened, the upper drill bit body central channel is coaxially communicated with the lower drill bit central channel, the slag suction channel on the side wall of the upper drill bit body is opened, the compressed gas generates high-speed high-pressure jet flow through the jet pore channel and forms a jet-suction effect, under the driving of the high-speed jet flow, the hole wall gap gas carries rock powder and rock debris, and simultaneously, the rock powder and rock debris enters the central channel along the slag suction channel and the bottom surface slag discharge guide groove, and the rock powder and rock debris are discharged to the ground surface to form reverse circulation. After drilling, the drill bit is lifted lightly to remove the bit pressure, the drill bit rotates reversely for a small angle, the convex shaft rotates reversely along the track of the arc-shaped groove, the lower drill bit body is retracted to the initial closed state, the lower drill bit body and the drill bit are coaxial, and at the moment, the drill bit can be directly extracted from the casing. If the lower drill bit body is blocked to withdraw, the drill bit can be slowly rotated to lift the drill bit, and the lower drill bit body can be forcibly restrained to slide into the sleeve under the action of the cutting surface on the outer edge of the lower drill bit body, and then the drill bit can be lifted out of the hole.
The fixing pin on the upper drill bit body only plays a role in suspension, and when the down-the-hole hammer drills, the down-the-hole hammer generates impact action which is directly transmitted to the shoulder of the lower drill bit body through the bottom surface of the upper drill bit body and then acts on the hard alloy spherical teeth to impact and cut broken rocks. The hard alloy spherical teeth are arranged according to the principle that the outer edge of the bottom edge of a lower drill bit body is encrypted, the inner part of the lower drill bit body is uniformly distributed, and the bottom surface of a drill bit is arranged in a full-coverage crossed manner along a rotary cutting path.
The utility model has the advantages that:
the utility model provides a down-the-hole hammer reverse circulation heel tube drill bit suitable for major diameter drilling adopts the reducing mechanism that a curved groove structure axle cooperation formed the reamer bit, only needs very little angle of corotation to reach the reducing effect. After the drilling is stopped, the reamer bit can be retracted by reversely rotating for a small angle. This configuration reduces the chance of the drill bit getting stuck when it is retracted. And the rotary extending outer edge of the lower drill bit body is provided with a cutting surface, so that the lower drill bit body can be forcibly restrained to slide into the sleeve pipe when the recovery failure condition is met, and the drilling tool is lifted out of the hole. Meanwhile, the bottom surface of the drill bit is a whole, the structural strength is high, and the requirement of the impact action of the large-diameter drill bit can be better met. The down-the-hole hammer generates impact action which is directly transmitted to the top surface of the lower drill bit body through the bottom surface of the upper drill bit body and then acts on the hard alloy spherical teeth to impact and cut broken rocks, and the energy transmission efficiency is high. In addition, present major diameter down-the-hole hammer adopts the positive circulation mode more, and it is big to have the required gas volume, and row's sediment effect is not good, the high scheduling problem of energy consumption, the utility model discloses the drill bit adopts reverse circulation structure, sets up two sediment passageways of inhaling in the hole bottom to cooperate the drill bit bottom surface to involute formula row's sediment guide slot, reverse circulation efficiency is high, and down-the-hole hammer strikes the efficiency height, and row's sediment effect is better, and drill bit bottom surface edge ball tooth adopts to encrypt to arrange simultaneously, combines good row's sediment condition, has increased the life of drill bit.
Drawings
Fig. 1 is the utility model discloses a reverse circulation is with tub drill bit overall structure sketch map.
Fig. 2 is the utility model discloses a reverse circulation is with tub drill bit section structure schematic diagram.
Fig. 3 is a front view of the combination structure of the upper drill bit body and the lower drill bit body according to the present invention.
Fig. 4 is a schematic view of the upper bit body structure of the present invention.
Fig. 5 is a schematic view of the structure of the lower bit body of the present invention.
Fig. 6 is the utility model discloses a reverse circulation is with pipe bit operating condition schematic diagram.
The labels in the above figures are as follows:
1. an upper drill bit body 2, a lower drill bit body 3, a central channel 4, a groove 5 and a convex shaft
6. Spline 7, injection pore canal 8, casing shoe 9, inner step 10, suspension boss
11. Slag suction channel 12, fixing pin 13, shoulder 14, arc-shaped groove 15 and cutting surface
16. Hard alloy spherical teeth 17 and a slag discharge guide groove.
Detailed Description
Please refer to fig. 1 to 6:
the utility model provides a down-the-hole hammer reverse circulation is with pipe drill bit suitable for major diameter drilling is including last drill bit body 1 and lower drill bit body 2, wherein lower drill bit body 2 hangs in the lower part of last drill bit body 1, go up drill bit body 1 and the middle part of lower drill bit body 2 and all seted up central channel 3, go up the lower part of drill bit body 1 and seted up recess 4, the top of lower drill bit body 2 is provided with protruding axle 5, recess 4 is corresponding with the shape of protruding axle 5, protruding axle 5 is inserted and is established in recess 4, the aperture of recess 4 is greater than the external diameter of protruding axle 5, protruding axle 5 can slide in recess 4, when protruding axle 5 slides and supports the one end of leaning on recess 4, thereby shift out the drilling tool outer fringe and realize the reaming and creep into bottom drill bit 2 bottom the lower.
The upper portion of the upper drill bit body 1 is provided with a spline 6, the upper drill bit body 1 is connected with a pneumatic down-the-hole hammer impactor through the spline 6, a plurality of penetrating injection holes 7 are formed in the side wall of the upper drill bit body 1 in the groove of the spline 6, the plurality of injection holes 7 are communicated with a central channel 3 in the middle of the upper drill bit body 1, a casing shoe 8 is further covered on the upper drill bit body 1, an inner step 9 is arranged on the inner side wall of the lower portion of the casing shoe 8, a hanging boss 10 is arranged on the side wall of the upper drill bit body 1 corresponding to the inner step 9, the upper drill bit body 1 is connected with the casing shoe 8 through the inner step 9 in a clamping mode with the hanging boss 10, a fixing pin 12 is inserted into the side wall of the lower drill bit body 1.
The side wall of the upper drill bit body 1 is also provided with a slag suction channel 11, the inlet of the slag suction channel 11 is positioned at the bottom of the upper drill bit body 1, and the outlet of the slag suction channel 11 is communicated with the central channel 3 in the middle of the upper drill bit body 1.
The lower drill bit body 2 is provided with a shoulder 13, the bottom of the upper drill bit body 1 is abutted against the shoulder 13, an arc-shaped groove 14 is arranged at the position, corresponding to the upper drill bit body 1, provided with a fixing pin 12, of the lower drill bit body 2, the fixing pin 12 on the upper drill bit body 1 is inserted into the arc-shaped groove 14, the lower drill bit body 2 can slide in the track of the arc-shaped groove 14, a cutting surface 15 is arranged on one side of the lower part of the lower drill bit body 2, hard alloy spherical teeth 16 are embedded in the bottom of the lower drill bit body 2, the bottom of the lower drill bit body 2 is also provided with a plurality of slag discharging guide grooves 17, and outlets of the plurality of slag discharging guide grooves 17 are communicated.
A plurality of slag discharge guide grooves 17 are arranged around the inlet of the central channel 3 at the bottom of the lower drill bit body 2 in an involute form.
The groove 4 at the lower part of the upper drill bit body 1 is a long circular groove taking a circular arc line as a symmetrical axis, and the shape of the convex shaft 5 at the upper part of the lower drill bit body 2 corresponds to the shape of the long circular groove.
The hard alloy buttons 16 at the bottom of the lower drill bit body 2 are embedded in a full-covering and cross mode along a rotary cutting path, meanwhile, the hard alloy buttons are also embedded on the side edge of the bottom edge of the lower drill bit body 2, and the hard alloy buttons 16 are embedded in a rotating and extending part at the bottom of the lower drill bit body 2 in a dense mode.
The top end of the casing shoe 8 is connected with the casing through a screw thread.
The utility model discloses a theory of operation:
the utility model provides a down-the-hole hammer reverse circulation is with tub drill bit when creeping into, the gyration effect that the rig produced drives bit body 1 gyration through spline 6 to the drive is drill body 2 synchronous rotations down, and compressed air drives the pneumatic down-the-hole hammer motion simultaneously, and the impact effect of production transmits to drill body 2 down through last bit body 1, under impact and gyration combined action, and carbide button 16 begins work grinding rock and creeps into. Under the action of cutting resistance and friction, the convex shaft 5 on the upper part of the lower drill bit body 2 rotates along the track of the arc-shaped groove 14 in the groove 4 on the lower part of the upper drill bit body 1 and gradually rotates to extend out of the outer edge of the drilling tool, under the size constraint of the convex shaft 5 and the groove 4, the convex shaft 5 rotates for a small angle and then is attached to one end of the groove 4 to reach the displacement limit, and at the moment, the maximum rotation diameter is larger than the diameter of a sleeve, so that reaming drilling is realized. The reaming size can be controlled by varying the dimensions of the stub shaft 5 and the recess 4. The reamer bit drives the casing together downwards through the casing shoe 8. When the drill bit is completely opened, the central channel 3 in the middle of the upper drill bit body 1 is coaxially communicated with the central channel 3 in the middle of the lower drill bit body 2, the slag suction channel 11 in the side wall of the upper drill bit body 1 is opened, the compressed gas generates high-speed high-pressure jet flow through the injection pore channel 7 and forms an injection and suction effect, under the driving of the high-speed jet flow, the hole wall gap gas carries rock powder and rock debris and simultaneously enters the central channel 3 along the slag suction channel 11 and the bottom surface slag discharge guide groove 17, and the rock powder and rock debris are discharged to the ground surface to form reverse circulation. After drilling is finished, the drilling tool is lifted lightly to remove the drilling pressure, the drilling tool rotates reversely for a small angle, the convex shaft 5 rotates reversely along the track of the arc-shaped groove 14, the lower drill bit body 2 is retracted to an initial closed state, the lower drill bit body 2 and the drilling tool are coaxial, and at the moment, the drill bit can be directly extracted from the casing. If the lower drill bit body 2 is blocked to withdraw, the drill bit can be slowly rotated to lift the drill bit, and the lower drill bit body 2 can be forcibly restrained to slide into the sleeve under the action of the cutting surface 15 at the outer edge of the lower drill bit body 2, and then the drill bit can be lifted out of the hole.
The fixed pin 12 on the upper drill bit body 1 only plays a role of suspension, and when drilling, the down-the-hole hammer generates impact action which is directly transmitted on the shoulder 13 of the lower drill bit body 2 through the bottom surface of the upper drill bit body 1 and then acts on the hard alloy spherical teeth 16 to impact and cut broken rocks. The hard alloy spherical teeth 16 are arranged according to the principle that the outer edge of the bottom edge of the lower drill bit body 2 is encrypted, the inner part is uniformly distributed, and the bottom surface of the lower drill bit body 2 is arranged in a full-coverage cross mode along a rotary cutting path.
Claims (7)
1. The utility model provides a down-the-hole hammer reverse circulation is with pipe drill bit suitable for major diameter drilling which characterized in that: the drilling tool comprises an upper drill bit body and a lower drill bit body, wherein the lower drill bit body is hung on the lower portion of the upper drill bit body, a central channel is formed in the middle of the upper drill bit body and the middle of the lower drill bit body, a groove is formed in the lower portion of the upper drill bit body, a protruding shaft is arranged at the top end of the lower drill bit body, the groove corresponds to the protruding shaft in shape, the protruding shaft is inserted into the groove, the aperture of the groove is larger than the outer diameter of the protruding shaft, the protruding shaft can slide in the groove, and when the protruding shaft slides and abuts against one end of the groove, the bottom of the lower drill bit body.
2. A down-the-hole hammer reverse circulation casing bit suitable for large diameter drilling according to claim 1, wherein: the upper portion of going up the drill bit body be provided with the spline, it is connected with pneumatic down-the-hole hammer impacter through the spline to go up the drill bit body, set up several penetrating injection pore on the lateral wall of the drill bit body on the inslot of spline, several injection pore all are linked together with the central channel of last drill bit body middle part, it still covers and is equipped with the casing shoe on the drill bit body to go up, be provided with interior step on the inside wall of casing shoe lower part, be provided with on the last drill bit body lateral wall of the position that corresponds with interior step and hang the boss, go up between drill bit body and the casing shoe through interior step and hang the boss looks joint, it is equipped with the fixed pin to insert on the lateral wall of upper.
3. A down-the-hole hammer reverse circulation casing bit suitable for large diameter drilling according to claim 1, wherein: the side wall of the upper drill bit body is also provided with a slag suction channel, the inlet of the slag suction channel is positioned at the bottom of the upper drill bit body, and the outlet of the slag suction channel is communicated with the central channel in the middle of the upper drill bit body.
4. A down-the-hole hammer reverse circulation casing bit suitable for large diameter drilling according to claim 1 or 2, wherein: the lower drill bit body on be provided with the circular bead, the bottom of going up the drill bit body supports and leans on the circular bead, lower drill bit body and last drill bit body set up the corresponding position department of fixed pin and are provided with the arc wall, the fixed pin on the last drill bit body is inserted and is established in the arc wall, lower drill bit body can slide in the orbit of arc wall, one side of lower drill bit body lower part is provided with the cutting surface, the bottom of lower drill bit body inlays and is equipped with carbide button, the bottom of lower drill bit body still is provided with several sediment guide slots, the export of several sediment guide slots all is linked together with the centre channel import of lower drill bit body bottom.
5. A down-the-hole hammer reverse circulation casing bit suitable for large diameter drilling according to claim 4, wherein: the plurality of slag discharge guide grooves are arranged around the inlet of the central channel at the bottom of the lower drill bit body in an involute form.
6. A down-the-hole hammer reverse circulation casing bit suitable for large diameter drilling according to claim 1, wherein: the groove at the lower part of the upper drill bit body is a long circular groove taking an arc line as a symmetrical axis, and the shape of the convex shaft at the upper part of the lower drill bit body corresponds to that of the long circular groove.
7. A down-the-hole hammer reverse circulation casing bit suitable for large diameter drilling according to claim 4, wherein: the hard alloy spherical teeth at the bottom of the lower drill bit body are embedded in a full-covering and crossed mode along a rotary cutting path, meanwhile, the hard alloy spherical teeth are embedded in the side edge of the bottom edge of the lower drill bit body, and the hard alloy spherical teeth are embedded in the rotary extending part at the bottom of the lower drill bit body in a dense mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922458317.0U CN211201769U (en) | 2019-12-31 | 2019-12-31 | Down-the-hole hammer reverse circulation follow pipe drill bit suitable for large-diameter drilling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922458317.0U CN211201769U (en) | 2019-12-31 | 2019-12-31 | Down-the-hole hammer reverse circulation follow pipe drill bit suitable for large-diameter drilling |
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| CN211201769U true CN211201769U (en) | 2020-08-07 |
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| CN201922458317.0U Active CN211201769U (en) | 2019-12-31 | 2019-12-31 | Down-the-hole hammer reverse circulation follow pipe drill bit suitable for large-diameter drilling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111021964A (en) * | 2019-12-31 | 2020-04-17 | 吉林大学 | Down-the-hole hammer reverse circulation follow pipe drill bit suitable for large-diameter drilling |
| CN112983274A (en) * | 2021-03-09 | 2021-06-18 | 中国石油大学(华东) | Rotary guide type two-stage down-the-hole hammer drill |
| CN111021964B (en) * | 2019-12-31 | 2024-04-26 | 吉林大学 | Down-the-hole hammer reverse circulation pipe-following drill bit suitable for large-diameter drilling |
-
2019
- 2019-12-31 CN CN201922458317.0U patent/CN211201769U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111021964A (en) * | 2019-12-31 | 2020-04-17 | 吉林大学 | Down-the-hole hammer reverse circulation follow pipe drill bit suitable for large-diameter drilling |
| CN111021964B (en) * | 2019-12-31 | 2024-04-26 | 吉林大学 | Down-the-hole hammer reverse circulation pipe-following drill bit suitable for large-diameter drilling |
| CN112983274A (en) * | 2021-03-09 | 2021-06-18 | 中国石油大学(华东) | Rotary guide type two-stage down-the-hole hammer drill |
| CN112983274B (en) * | 2021-03-09 | 2023-03-14 | 中国石油大学(华东) | Rotary guide type two-stage down-the-hole hammer drill |
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