CN112647839B - Self-rotating pneumatic down-the-hole hammer - Google Patents
Self-rotating pneumatic down-the-hole hammer Download PDFInfo
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- CN112647839B CN112647839B CN202110069723.7A CN202110069723A CN112647839B CN 112647839 B CN112647839 B CN 112647839B CN 202110069723 A CN202110069723 A CN 202110069723A CN 112647839 B CN112647839 B CN 112647839B
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- Prior art keywords
- joint
- drill rod
- hole hammer
- air inlet
- pneumatic
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- 210000001503 joint Anatomy 0.000 claims abstract description 19
- 239000002893 slag Substances 0.000 claims description 28
- 238000004891 communication Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 abstract description 20
- 239000011435 rock Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a self-rotating pneumatic down-the-hole hammer, belonging to a rock drilling tool; the pneumatic down-the-hole hammer aims to provide a pneumatic down-the-hole hammer with the drilling depth not limited by a drill rod. The pneumatic down-the-hole hammer is driven to rotate by a drill rod, and the rotating device is composed of a supporting disk (1), a rotating joint (2) and a spiral pneumatic device (3) which are sequentially and fixedly connected; the supporting plate (1) consists of a supporting plate (1-3), an air inlet joint (1-1) and a lifting lug (1-2), and the rotary joint (2) consists of an upper joint (2-1) fixedly connected with the supporting plate (1-3), a middle joint (2-2) fixedly connected with the upper joint and a lower joint (2-3) rotatably communicated with the middle joint; the spiral pneumatic device (3) is composed of an air inlet pipe (3-1), a shell (3-3), an air outlet pipe (3-4) and a flow guide core body (3-2) welded in the shell through spiral blades (3-5), wherein the air inlet pipe, the shell (3-3) and the air outlet pipe are fixedly communicated in sequence; the drill rod (4) is fixedly communicated with the air outlet pipe (3-4) and the drill rod is fixedly communicated with the impactor (7).
Description
Technical Field
The invention relates to a pneumatic down-the-hole hammer, in particular to a self-rotating pneumatic down-the-hole hammer; belongs to a drilling tool for building foundation construction.
Background
The pneumatic down-the-hole hammer is a drilling tool for forming pile holes in the construction process of building foundations and is generally formed by connecting an impactor and an impact hammer in a sliding mode through splines. The working principle of pore-forming is that a power head arranged on a drilling machine drives a pneumatic down-the-hole hammer to rotate through a drill rod, and compressed air pushes a piston in an impactor to force the impact hammer to do up-and-down reciprocating impact motion so as to realize rock crushing; the broken rock debris is carried to the ground along with the waste gas discharged after the down-the-hole hammer works, so that hole cleaning and slag discharging are realized.
At present, a rigid connecting component is generally adopted to sink and drive the pneumatic down-the-hole hammer to work, and the following defects exist:
1) The drilling depth is limited by the length of the drill rod, and the requirement of deep hole drilling cannot be met;
2) If the drill rod is too long, the drill rod can swing greatly, the drill rod is easy to rub the wall of the pile hole, and the transmission efficiency is reduced;
3) Too large a drilling depth not only causes difficulty in slag removal and influences drilling efficiency, but also easily aggravates rapid abrasion of the impact hammer.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the self-rotating type pneumatic down-the-hole hammer which is simple in structure, free of limitation of the drilling depth by the length of a drill rod and easy in slag discharge.
In order to achieve the purpose, the invention adopts the following technical scheme: the device comprises a pneumatic down-the-hole hammer formed by connecting an impactor and an impact hammer through splines, and a rotating device for driving the pneumatic down-the-hole hammer to rotate through a drill rod; the rotating device is composed of a supporting disk, a rotating joint and a spiral pneumatic device which are sequentially and fixedly connected from top to bottom, wherein the supporting disk is composed of an air inlet joint and two lifting lugs which are fixed on a supporting plate; the rotary joint consists of an upper joint which is fixed on the back of the support plate and communicated with the air inlet joint, a middle joint which is fixedly butted and communicated with the upper joint, and a lower joint which is rotatably butted and communicated with the lower end of the middle joint through a bearing assembly; the spiral pneumatic device consists of an air inlet pipe, a shell, an air outlet pipe and a bullet-shaped flow guide core body, wherein the air inlet pipe, the shell and the air outlet pipe are fixedly and butt-jointed and communicated from top to bottom in sequence, and the flow guide core body is welded in the shell through a plurality of spiral blades; the air inlet pipe is fixedly communicated with the lower port of the lower joint in a butt joint manner; the drill rod is of a hollow tubular structure, the upper port of the drill rod is fixedly in butt joint communication with the lower port of the air outlet pipe, and the lower port of the drill rod is fixedly in butt joint communication with the impactor through a threaded sleeve.
The lifting lugs are distributed on two sides of the air inlet joint.
The bearing assembly consists of a deep groove ball bearing and a thrust roller bearing.
The air inlet pipe is of an inverted funnel-shaped structure, and the air outlet pipe is of a funnel-shaped structure.
A slag collecting device arranged on the drill rod is arranged between the spiral pneumatic device and the screw sleeve and consists of two sliding sleeves sleeved on the drill rod in an empty mode, supports correspondingly fixed on the sliding sleeves, slag collecting barrels fixedly connected with the supports and arranged on the top face of the screw sleeve, and two second lifting lugs distributed on two sides of the drill rod and fixed on the supports.
Compared with the prior art, the invention has the following advantages due to the adoption of the technical scheme:
1) The pneumatic rotary device is adopted to replace a hydraulic power head or a motor power head of the drilling machine, and a rotary joint is added, so that flexible connection can be realized between the drilling machine and the pneumatic down-the-hole hammer by adopting a steel rope, and compressed air is utilized to drive the pneumatic down-the-hole hammer to rotate. The defect that the drilling depth of a pneumatic down-the-hole hammer of a traditional structure is limited by the length of a drill rod is thoroughly overcome, and large-depth pile hole forming can be realized.
2) Because the slag collecting device is added, the stored rock slag can be lifted to the ground in the deep hole drilling process, and hole cleaning and slag discharging are realized; not only can improve the drilling efficiency, but also can reduce the abrasion of the impact hammer.
3) Because the length of the drill rod in the slag collecting barrel is greatly shortened and the rigidity is improved, the drill rod cannot rub the hole wall due to large-amplitude swing in the rotating process, and the transmission efficiency cannot be lost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of the structure of the rotating device of the present invention;
FIG. 4 is a top view of FIG. 1;
fig. 5 is a sectional view taken along line B-B in fig. 1.
In the figure: the device comprises a supporting plate 1, an air inlet joint 1-1, lifting lugs 1-2, a supporting plate 1-3, a rotary joint 2, an upper joint 2-1, a middle joint 2-2, a lower joint 2-3, a bearing assembly 2-4, a spiral pneumatic device 3, an air inlet pipe 3-1, a flow guide core body 3-2, a shell 3-3, an air outlet pipe 3-4, spiral blades 3-5, a drill rod 4, a slag collecting device 5, a second lifting lug 5-1, a slag collecting barrel 5-2, a sliding sleeve 5-3, a support 5-4, a threaded sleeve 6, an impactor 7, a drill rod joint 7-1, a pile hole 8, an impact hammer 9 and a chip discharge groove 9-1.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1-5: the pneumatic down-the-hole hammer is composed of an impactor 7 and an impact hammer 9 slidably connected to the impactor by splines (not shown). The rotating device drives the pneumatic down-the-hole hammer to rotate through the drill rod 4. The rotating device is composed of a supporting disk 1, a rotating joint 2 and a spiral pneumatic device 3 which are sequentially and fixedly connected from top to bottom, wherein:
the support plate 1 is composed of an air inlet joint 1-1 fixed on a support plate 1-3 and two lifting lugs 1-2 used for connecting a lifting steel rope (not shown in the figure). The hoisting steel rope can make the drilling machine vertically move up and down under the driving of the winch, so that the drilling depth is not limited by the length of the drill rod, and the drilling capacity of the equipment is greatly enhanced.
The rotary joint 2 is composed of an upper joint 2-1 fixed on the back of a support plate 1-3 through a flange (not marked in the figure) and communicated with an air inlet joint 1-1, a middle joint 2-2 in butt joint communication with the upper joint through a welding mode, and a lower joint 2-3 in rotary butt joint communication with the lower end of the middle joint through a bearing assembly 2-4.
The spiral pneumatic device 3 is composed of an air inlet pipe 3-1, a shell 3-3, an air outlet pipe 3-4 and a flow guide core body 3-2 which is welded in the shell 3-3 in a bullet shape through a plurality of spiral blades 3-5, wherein the air inlet pipe 3-1, the shell 3-3 and the air outlet pipe 3-4 are fixedly butted and communicated from top to bottom in sequence through other flanges (not shown in the figure); the air inlet pipe 3-1 is communicated with the lower port of the lower joint 2-3 in a butt joint way. The flow guide core body 3-2 adopts a bullet-shaped structure with a taper at the top, which is beneficial to reducing inflow of compressed gas and improving the flow velocity of the gas; the helical blades 3-5 which are distributed from top to bottom along the axial direction in a helical mode are welded, sealed and connected with the outer cylinder of the flow guiding core body 3-2 and the inner wall of the shell 3-3 into a whole to form a plurality of helical airflow channels, so that the compressed gas can be ensured to flow spirally along the axial direction and generate larger tangential thrust.
The drill rod 4 is of a hollow tubular structure, and the upper end of the drill rod is fixedly butted and communicated with the lower port of the air outlet pipe 3-4 through a bolt (not shown in the figure). A screw sleeve 6 fixed through a conical thread is arranged at a drill rod joint 7-1 of the impactor 7, and the lower port of the drill rod 4 is communicated with the screw sleeve in a welding mode.
In order to ensure that the down-the-hole hammer can vertically lift, the two lifting lugs 1-2 are respectively positioned at two sides of the air inlet joint 1-1.
In order to ensure that the rotary joint 2 can withstand axial and radial impact forces, the bearing assemblies 2-4 are composed of deep groove ball bearings and thrust roller bearings.
In order to facilitate the reducing flow of the compressed air and reduce the pressure loss in the air flow flowing process, the air inlet pipe 3-1 adopts an inverted funnel-shaped structure, and the air outlet pipe 3-4 adopts a funnel-shaped structure.
In order to facilitate the storage of rock debris, a slag collecting device 5 is arranged on the drill rod 4 between the spiral pneumatic device 3 and the thread sleeve 6. The slag collecting device consists of two sliding sleeves 5-3 which are sleeved on a drill rod 4 in an empty way, brackets 5-4 which are correspondingly welded on the sliding sleeves 5-3 and are of a cross-shaped or cross-shaped structure, slag collecting barrels 5-2 which are arranged on the top surface of a threaded sleeve 6 (the top surface is of a plane structure) and are welded with the brackets 5-4 into a whole, and two second lifting lugs 5-1 which are distributed on two sides of the drill rod 4 and fixed on the brackets 5-4 and are used for connecting a pull rope (not shown in the figure). In the process of deep hole hammer drilling operation, when the air pressure discharged from a chip discharge groove 9-1 at the bottom of the impact hammer 9 is insufficient to carry rock debris to the ground, the rock debris falls back into the slag collection barrel 5-2 to be stored. When slag is required to be discharged, the whole device is lifted upwards from the pile hole 8 by using the winch, then the slag collecting barrel 5-2 is lifted upwards by using the second lifting lug 5-1, and rock debris can be automatically discharged from the bottom of the slag collecting barrel 5-2.
The impacter 7 and the impact hammer 9 in the above embodiments are all mature technologies, and detailed descriptions of the detailed structures thereof are omitted.
When the air compressor is in work, the air inlet connector 1-1 is communicated with an air compressor (not shown in the figure) through an external air pipe (not shown in the figure), the lifting lug 1-2 is connected with a winch through a steel rope, the air compressor is put into the pile hole 8, and then the air compressor is started.
The working principle is as follows:
compressed air enters the spiral pneumatic device 3 through the external air pipe, the air inlet joint 1-1 and the rotary joint 2, enters a spiral channel jointly formed by the shell 3-3, the spiral blade 3-5 and the flow guide core body 3-2 under the flow equalizing action of the flow guide core body 3-2 to form high-pressure rotary air flow, and tangential component force generated by the high-pressure rotary air flow on the spiral blade 3-5 can drive the whole spiral pneumatic device 3 to rotate through each spiral blade 3-5; the pneumatic down-the-hole hammer, which is fixedly connected to the screw pneumatic device via the drill rod 4, is then rotated therewith, so that drilling is effected.
Compressed air from the screw air device 3 is fed through the drill rod 4 into the interior of the hammer 7, in which a piston (not shown) drives the hammer 9 in a reciprocating up and down percussive motion, thereby effecting rock breaking.
The compressed air does work on the impact hammer 9 and then is discharged outwards through a discharge cutting groove 9-1 at the bottom of the impact hammer, and crushed rock debris is carried to the ground to realize hole cleaning and slag discharge. Along with the continuous increase of the depth of the pile hole, when the discharged air pressure is not enough to carry the rock debris to the ground, the rock debris falls back after being jacked up for a certain distance by the air flow and falls into the slag collecting barrel 5-2 for temporary storage; when the slag collecting barrel 5-2 is fully collected with the rock debris, the slag collecting barrel can be lifted to the ground through the winch, then the slag collecting barrel 5-2 is lifted through the second lifting lug 5-1, and the rock debris can automatically flow out from the bottom of the slag collecting barrel 5-2 to realize slag discharge.
Claims (5)
1. A self-rotating pneumatic down-the-hole hammer comprises a pneumatic down-the-hole hammer formed by connecting an impactor and an impact hammer through splines, and a rotating device for driving the pneumatic down-the-hole hammer to rotate through a drill rod; the rotary device is characterized by comprising a supporting disk (1), a rotary joint (2) and a spiral pneumatic device (3) which are sequentially and fixedly connected from top to bottom, wherein:
the supporting plate (1) is composed of an air inlet joint (1-1) fixed on the supporting plate (1-3) and two lifting lugs (1-2);
the rotary joint (2) is composed of an upper joint (2-1) which is fixed on the back of the support plate (1-3) and communicated with the air inlet joint (1-1), a middle joint (2-2) which is fixedly butted and communicated with the upper joint, and a lower joint (2-3) which is rotatably butted and communicated with the lower end of the middle joint through a bearing assembly (2-4);
the spiral pneumatic device (3) is composed of an air inlet pipe (3-1), a shell (3-3), an air outlet pipe (3-4) and a flow guide core body (3-2) which is welded on the inner wall of the shell (3-3) through a plurality of spiral blades (3-5) and is in a bullet shape, wherein the air inlet pipe (3-1), the shell (3-3) and the air outlet pipe (3-4) are fixedly and communicated in a butt joint mode from top to bottom; the air inlet pipe (3-1) is fixedly communicated with the lower port of the lower joint (2-3) in a butt joint way;
the drill rod (4) is of a hollow tubular structure, the upper port of the drill rod is fixedly in butt joint communication with the lower port of the air outlet pipe (3-4), and the lower port of the drill rod (4) is fixedly in butt joint communication with the impactor (7) through a threaded sleeve (6).
2. A self-rotating pneumatic down-the-hole hammer as claimed in claim 1, wherein: the lifting lugs (1-2) are distributed on two sides of the air inlet joint (1-1).
3. A self-rotating pneumatic down-the-hole hammer as claimed in claim 1, wherein: the bearing assembly (2-4) consists of a deep groove ball bearing and a thrust roller bearing.
4. A self-rotating pneumatic down-the-hole hammer as claimed in claim 1, wherein: the air inlet pipe (3-1) is of an inverted funnel-shaped structure, and the air outlet pipe (3-4) is of a funnel-shaped structure.
5. A self-rotating pneumatic down-the-hole hammer as claimed in any one of claims 1 to 4, wherein: a slag collecting device (5) arranged on the drill rod (4) is arranged between the spiral pneumatic device (3) and the screw sleeve (6), and the slag collecting device consists of two sliding sleeves (5-3) sleeved on the drill rod (4) in an empty way, supports (5-4) correspondingly fixed on the sliding sleeves (5-3), slag collecting barrels (5-2) fixedly connected with the supports (5-4) and arranged on the top surface of the screw sleeve (6), and two second lifting lugs (5-1) distributed on two sides of the drill rod (4) and fixed on the supports (5-4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110069723.7A CN112647839B (en) | 2021-01-19 | 2021-01-19 | Self-rotating pneumatic down-the-hole hammer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110069723.7A CN112647839B (en) | 2021-01-19 | 2021-01-19 | Self-rotating pneumatic down-the-hole hammer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112647839A CN112647839A (en) | 2021-04-13 |
| CN112647839B true CN112647839B (en) | 2023-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110069723.7A Active CN112647839B (en) | 2021-01-19 | 2021-01-19 | Self-rotating pneumatic down-the-hole hammer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1522932A (en) * | 1976-02-19 | 1978-08-31 | Ingersoll Rand Co | Fluid actuated impact tool |
| CN103790513A (en) * | 2014-03-03 | 2014-05-14 | 北京南车时代机车车辆机械有限公司 | Deslagging device for pneumatic down-hole hammer |
| CN104033101A (en) * | 2014-05-22 | 2014-09-10 | 同济大学 | Major-diameter pneumatic downhole hammer with casing pipe drill |
| CN104033100A (en) * | 2014-05-22 | 2014-09-10 | 同济大学 | Major-diameter pneumatic downhole hammer impactor |
| CN106050128A (en) * | 2016-08-06 | 2016-10-26 | 吉林大学 | Drill bit self-rotation type pneumatic down-the-hole hammer |
| CN207376620U (en) * | 2017-10-29 | 2018-05-18 | 贵阳云海岩土工程有限公司 | Submersed type rope down-hole hammer embedded rock pile machine |
| JP2019070250A (en) * | 2017-10-06 | 2019-05-09 | 東洋企画株式会社 | Down-the-hole drilling device |
| WO2019092600A1 (en) * | 2017-11-07 | 2019-05-16 | Gien Bernard L | A pneumatic drill hammer |
| CN109811877A (en) * | 2019-03-15 | 2019-05-28 | 李建岗 | A kind of water conservancy construction pipe-dredging guiding device |
| CN210317149U (en) * | 2019-07-26 | 2020-04-14 | 贵阳云海岩土工程有限公司 | Rope down-the-hole hammer |
| CN111502532A (en) * | 2020-06-01 | 2020-08-07 | 吉林大学 | Immersion type pneumatic down-the-hole hammer drilling device and method for exploiting geothermal energy of dry hot rock |
| CN111877979A (en) * | 2020-07-30 | 2020-11-03 | 重庆大学 | Ratchet type hydraulic impactor |
| CN212177024U (en) * | 2020-06-01 | 2020-12-18 | 吉林大学 | Immersed pneumatic down-the-hole hammer drilling device for exploiting geothermal energy of dry hot rock |
-
2021
- 2021-01-19 CN CN202110069723.7A patent/CN112647839B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1522932A (en) * | 1976-02-19 | 1978-08-31 | Ingersoll Rand Co | Fluid actuated impact tool |
| CN103790513A (en) * | 2014-03-03 | 2014-05-14 | 北京南车时代机车车辆机械有限公司 | Deslagging device for pneumatic down-hole hammer |
| CN104033101A (en) * | 2014-05-22 | 2014-09-10 | 同济大学 | Major-diameter pneumatic downhole hammer with casing pipe drill |
| CN104033100A (en) * | 2014-05-22 | 2014-09-10 | 同济大学 | Major-diameter pneumatic downhole hammer impactor |
| CN106050128A (en) * | 2016-08-06 | 2016-10-26 | 吉林大学 | Drill bit self-rotation type pneumatic down-the-hole hammer |
| JP2019070250A (en) * | 2017-10-06 | 2019-05-09 | 東洋企画株式会社 | Down-the-hole drilling device |
| CN207376620U (en) * | 2017-10-29 | 2018-05-18 | 贵阳云海岩土工程有限公司 | Submersed type rope down-hole hammer embedded rock pile machine |
| WO2019092600A1 (en) * | 2017-11-07 | 2019-05-16 | Gien Bernard L | A pneumatic drill hammer |
| CN109811877A (en) * | 2019-03-15 | 2019-05-28 | 李建岗 | A kind of water conservancy construction pipe-dredging guiding device |
| CN210317149U (en) * | 2019-07-26 | 2020-04-14 | 贵阳云海岩土工程有限公司 | Rope down-the-hole hammer |
| CN111502532A (en) * | 2020-06-01 | 2020-08-07 | 吉林大学 | Immersion type pneumatic down-the-hole hammer drilling device and method for exploiting geothermal energy of dry hot rock |
| CN212177024U (en) * | 2020-06-01 | 2020-12-18 | 吉林大学 | Immersed pneumatic down-the-hole hammer drilling device for exploiting geothermal energy of dry hot rock |
| CN111877979A (en) * | 2020-07-30 | 2020-11-03 | 重庆大学 | Ratchet type hydraulic impactor |
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| CN112647839A (en) | 2021-04-13 |
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