EP2623705B1 - Combined down-the-hole hammer - Google Patents

Combined down-the-hole hammer Download PDF

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Publication number
EP2623705B1
EP2623705B1 EP11827980.1A EP11827980A EP2623705B1 EP 2623705 B1 EP2623705 B1 EP 2623705B1 EP 11827980 A EP11827980 A EP 11827980A EP 2623705 B1 EP2623705 B1 EP 2623705B1
Authority
EP
European Patent Office
Prior art keywords
gas
hole
impactors
gas passage
hole hammer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11827980.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2623705A1 (en
EP2623705A4 (en
Inventor
Qinghua He
Huanyun Qian
Jianxin Zhu
Haijian Li
Chao DENG
Peng Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sunward Intelligent Equipment Co Ltd
Original Assignee
Sunward Intelligent Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN 201020550979 external-priority patent/CN201786251U/zh
Priority claimed from CN 201020550985 external-priority patent/CN201786252U/zh
Priority claimed from CN 201010298838 external-priority patent/CN101949261B/zh
Priority claimed from CN 201020550973 external-priority patent/CN201786250U/zh
Priority claimed from CN 201010298875 external-priority patent/CN101967955B/zh
Application filed by Sunward Intelligent Equipment Co Ltd filed Critical Sunward Intelligent Equipment Co Ltd
Publication of EP2623705A1 publication Critical patent/EP2623705A1/en
Publication of EP2623705A4 publication Critical patent/EP2623705A4/en
Application granted granted Critical
Publication of EP2623705B1 publication Critical patent/EP2623705B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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

Definitions

  • the disclosure relates to a combined down-the-hole hammer.
  • a drill bit is driven by a drill to drill holes on the strata in foundation pile construction, steel reinforcement cages are placed and concrete are filled in the holes subsequently, and foundation piles are formed after the concrete is hardened.
  • the drill can hardly drill holes when encountering hard strata, especially rocks and an impactor (also known as a down-the-hole hammer) is needed for impact drilling. Because of the capability of drilling efficiently in hard rocks, the impactor is applied broadly to mining and basic construction of buildings.
  • the well-known impactor (published on pages 66 to 68 in the first chapter of China Mining Equipment Manual-Volume One, for example) is also generally called an integrated down-the-hole hammer in the industry, consisting of a conic thread joint 61', an impactor main body 62' including a piston, an impact drill bit 64' provided with a hard alloy head 63', and the diameter of the impactor is generally equal to or smaller than ⁇ 300mm, as shown in Fig. 16 .
  • the down-the-hole hammer is connected with the power head of the drill through a hollow drill rod.
  • the power head drives the down-the-hole hammer to rotate, compressed air provided by an air compressor enters the impactor main body through the drill rod to drive the piston to strike the drill bit in a reciprocating manner frequently, and the impact energy is transferred to the hard alloy head of the drill bit to strike the rock in a reciprocating manner so as to break the rock.
  • the rock fragments are discharged through an annular gap between the drill rod and the pore wall along with the gas discharged by the down-the-hole hammer to form a pile hole eventually.
  • the advantage is the highly-efficient drilling in hard strata, especially rocks.
  • the integrated down-the-hole hammer has the following shortages when the demands for drilling large-diameter foundation piles ( ⁇ 500 to ⁇ 800 and diameters larger than ⁇ 1000) are increased:
  • an American patent US 4429439 publishes another cluster down-the-hole hammer.
  • a large-diameter down-the-hole hammer consisting of 5 small-diameter impactors clustered by frames is connected with a drill rod and a gas inlet passage via conic thread joints and distributes compressed air to each small impactors via a transverse gas passage to drive the impactors to perform impact drilling.
  • a further document DE 30 24218 A1 is known, disclosing a percussive drilling equipment, the drilling equipment discloses a first drilling linkage, a hammer, low-voltage hammers and a low-floor hammer.
  • the the hammer is driven to rotate by a drive motor.
  • the low-voltage hammers rotate and drive the impact drill bit to rotate through a spline.
  • the disclosure aims at providing a combined down-the-hole hammer to solve at least one of the above problems in the prior art.
  • the disclosure provides a combined down-the-hole hammer, comprising a coupler configured to connect with a drill rod and internally provided with a first gas passage; a bracket; and a plurality of impactors installed on the bracket, each of which is provided with a second gas passage and the impact drill bit of each of the impactors can rotate around the axis per se.
  • a gas distributor is provided between the coupler and the bracket. The gas distributor is provided with a gas collection chamber communicated with the fist gas passage and a plurality of gas-distributing paths communicating the gas collection chamber with the second gas passage of each of the impactors.
  • the impactor comprises: an impactor main body installed in the interior of the bracket, the impactor main body is internally provided with a piston cavity for installing an impact piston; and the impact drill bit installed at the lower end of the piston cavity, the impact drill bit is matched with the impactor main body and is movable axially and rotatable circumferentially.
  • the impact drill bit comprises an impact head and a guiding axis connected with each other; the upper portion of the guiding axis is provided with a limiting concave portion extending axially; a limiting ring is sleeved around the limiting concave portion; the guiding axis is inserted into the piston cavity and the limiting ring is limited by a locating platform provided on the inner wall of the piston cavity and a guiding sleeve installed at the lower port of the piston cavity; the guiding sleeve is sleeved on the guiding axis.
  • the axis of at least one second gas passage of the impactors is parallel to the axis of the first gas passage; among the gas-distributing paths, the axis of the gas-distributing path which communicates at least one second gas passage and the gas collection chamber is a curve in smooth transition.
  • a gas flow regulator is provided on at least one of the gas-distributing paths.
  • each of the gas-distributing paths is respectively connected with the top of the corresponding second gas passage through a convergent transition gas hole, and the gas flow distributor is a damper regulating ring provided at each transition gas hole.
  • the coupler comprises a columnar connector which forms the first gas passage.
  • the drill rod is provided with an installation hole matched with the columnar connector.
  • the columnar connector and the drill rod are connected by a pin shaft running therebetween.
  • a sealing structure is provided between the columnar connector and the installation hole.
  • a rotation stopping platform surface is formed on the outer side wall of the columnar connector and the columnar connector is provided with a first cavity extending horizontally on the outer side wall thereof; the drill rod is provided with a second cavity extending horizontally and intersected with the installation hole.
  • the pin shafts are installed in the second cavity and pass through the first cavity.
  • the bracket comprises a cylindrical shell, an upper board connected to the upper portion of the cylindrical shell, and a bottom board connected to the lower portion of the cylindrical shell.
  • Both the upper board and the bottom board are provided with a locating hole for installing each of the impactors;
  • the impactor is provided with a columnar joint at its upper end and the columnar joint is provided with an inner hole forming a portion of the second gas passage.
  • the inner hole is connected with the gas-distributing path.
  • the columnar joint is provided with a locating circular groove at the periphery thereof. The columnar joint runs through a locating hole of the upper board and is located by a locating ring sleeved on the locating circular groove.
  • the locating circular ring is locating ring opened oppositely, and the locating ring is sleeved with limiting sleeves, the upperside of the imiting sleeves (62) is limited by a retainer ring and a snap spring.
  • the columnar joint is provided peripherally with a seal groove located above the locating circular groove.
  • each of the impactors is matched with the bottom board through a key groove and a connecting key; a dustproof sealing structure is provided between the bottom board and the impactor; the upper port of the cylindrical shell is hermetically matched with the lower end face of the gas distributor, and a transition plate with a hole is provided between the lower end face of the gas distributor and the upper board.
  • Fig. 1 to Fig. 6 illustrate the first preferred embodiment of a combined down-the-hole hammer according to the disclosure.
  • the combined down-the-hole hammer comprises a coupler 1, a gas distributor 2, a bracket 3 and impactors 4.
  • the coupler 1 is used to connect with a drill rod 5 and is internally provided with a first gas passage 10.
  • the first gas passage 10 is connected with a gas passage of the drill rod 5.
  • the gas distributor 2 is provided between the coupler 1 and the bracket 3.
  • Plurality of impactors 4 are installed on the bracket 3 and each of the impactors 4 is individually provided with a second gas passage 40.
  • the impactor 4 comprises an impactor main body 42 and an impact drill bit 45.
  • the impact drill bit 45 is provided with a hard alloy head 44.
  • the gas distributor 2 comprises a gas collection chamber 21 communicated with the fist gas passage 10 and several gas-distributing paths 22 communicating the gas collection chamber 21 with the second gas passage 40 of each of the impactors 4.
  • the coupler 1, the gas distributor 2 and the bracket 3 may be connected by the following method.
  • the lower end of the coupler 1 is provided with a first flange plate 12 which is connected with the upper end of the gas distributor 2 through a bolt 27 or a screw.
  • the lower end of the gas distributor 2 is provided with a second flange plate 24, and the second flange plate 24 is connected with the upper end of the bracket 3 via a bolt 37 or a screw.
  • a sealing ring 25 is installed between the coupler 1 and the gas distributor 2.
  • FIG. 2 It can be easily seen from Fig. 2 that in the present embodiment, there are 5 impactors 4, one of which is provided in the center and the other four are arranged around the central impactor uniformly in an annular manner.
  • the second gas passage of the central impactor 4 is overlapped with the axis of the first gas passage 10, and the axes of the second gas passages of the other impactors 4 are parallel to the axis of the first gas passage 10.
  • the gas-distributing path communicating the second gas passage in the center and the collection chamber 21 is a through structure and the axis of the gas-distributing path 22 connecting the four peripheral second gas passages and the collection chamber 21 is a curve in smooth transition, i.e.
  • the central gas-distributing path 22 is further provided with a gas flow regulator 26 capable of controlling and regulating the gas supply parameters (including the gas pressure and the gas flow) of the central impactor to effectively improve the utilization efficiency of the compressed air and save the energy.
  • a gas flow regulator 26 capable of controlling and regulating the gas supply parameters (including the gas pressure and the gas flow) of the central impactor to effectively improve the utilization efficiency of the compressed air and save the energy.
  • the coupler 1 further comprises a columnar connector 11 forming the first gas passage.
  • An installation hole 51 matched with the columnar connector is provided on the drill rod 5.
  • the columnar connector 11 and the drill rod 5 are connected by a pin shaft 13 running therebetween.
  • a sealing structure 14 is provided between the columnar connector 11 and the installation hole 51 so as to install and disassemble the combined down-the-hole hammer and the drill rod 5 conveniently and seal the gas passages reliably, thus overcoming the problems in the prior art that the whole down-the-hole hammer which is connected with the drill rod 5 by a conic thread joint needs to be rotated during the connection and tightened by a very large torque to ensure the tightness between the down-the-hole hammer and the drill rod, and that the onsite installation and disassembly are inconvenient etc.
  • the sealing structure 14 is a sealing ring provided at the upper end of the columnar connector 11 and the edge of the upper end of the columnar connector 11 is a chamfered structure so that the gas passage sealing effect is better and the cost is relatively low.
  • the cross section of the columnar connector 11 is a regular hexagon.
  • the installation hole 51 is an internal hexagonal hole.
  • a rotation-stopping platform surface for preventing the columnar connector from rotating relative to the drill rod 5 is formed on each side surface of the columnar connector 11.
  • the outer side wall of the columnar connector 11 is provided with a first cavity extending horizontally.
  • the drill rod 5 is provided with a second cavity extending horizontally and intersected with the installation hole 51.
  • the pin shafts 13 are installed in the second cavity and run through the first cavity to connect the columnar connector 11 and the drill rod 5 and facilitate machining of the installation hole of the pin shafts 13.
  • the bracket 3 comprises a cylindrical shell 36, an upper board 35 connected to the upper portion of the cylindrical shell 36 and a bottom board 34 connected to the lower portion of the cylindrical shell 36. Both the upper board 35 and the bottom board 34 are provided with a locating hole for installing each of the impactors 4.
  • the upper end of the impactor 4 i.e. the upper end of the impactor main body 42
  • the columnar joint 41 is provided with an inner hole forming a portion of the second gas passage.
  • the inner hole is connected with the gas-distributing path 22.
  • the columnar joint 41 is provided peripherally with a locating circular groove.
  • the columnar joint 41 runs through a locating hole 35 of the upper board and is located by a locating ring 61 sleeved on the locating circular groove. To ensure the gas tightness of the gas passage, the end of the columnar joint 41 is installed with a sealing ring 9.
  • the upper port of the cylindrical shell 36 is hermetically matched with the lower end face of the gas distributor 2, and a transition plate 31 with a hole is provided between the lower end face of the gas distributor 2 and the upper board 35.
  • the locating ring 61 is located in the hole on the transition plate 31 to enhance the structural stability of the combined down-the-hole hammer.
  • each of the impactors 4 is matched with the bottom board 34 through a key groove 32 and a connecting key 43.
  • a dustproof sealing structure 33 is provided between the bottom board 34 and the impactor 4.
  • the dustproof sealing structure 33 is a dustproof ring extending into the locating hole of the bottom board 34, for example.
  • Fig. 7 to Fig. 9 show the second preferred embodiment of the disclosure.
  • the difference between the second preferred embodiment and the first preferred embodiment above is that there are six impactors 4.
  • the axiss of the second gas passages 40 of the six impactors 4 are all parallel with the first gas passage 10.
  • the gas-distributing path 22 connecting the collection chamber 21 with the second gas passage 40 of each of the impactors is a large curvature gas passage structure.
  • each gas-distributing path 22 is respectively connected with the top of the corresponding second gas passage 40 through a convergent transition gas hole 20, and the gas flow distributor 26 is a damper regulating ring provided at each transition gas hole 20.
  • damper regulating rings of different specifications can be selected as the gas flow distributor 26 of each corresponding gas-distributing path 22 according to the working pressure of each of the impactors 4 to distribute gas flows reasonably, utilize the energy efficiently and further improve the drilling efficiency.
  • the impactor 4 comprises an impactor main body 42 and the impact drill bit 45.
  • the impactor main body 42 is installed in the bracket 3 and the impactor main body 42 is internally provided with a piston cavity for installing an impact piston 410.
  • the impact drill bit 45 is installed in the piston cavity from the lower end, and the impact drill bit 45 and the impactor main body 42 can be matched in an axial moving manner or a circumferential rotating manner.
  • the impact drill bit 45 of each of the impactors 4 can rotate around the axis per se while revolving with the impactor so that the hard alloy head 44 on the impact drill bit 45 is abraded uniformly to improve the working efficiency and prolong the service life.
  • the impact drill bit 45 comprises an impact head 451 a guiding axis 49 connected with each other.
  • the hard alloy head 44 is installed on the impact head 451.
  • the upper portion of the guiding axis 49 is provided with a limiting concave portion 401 extending axially.
  • a limiting ring 48 is sleeved on the limiting concave portion 401.
  • the guiding axis 49 is inserted into the piston cavity from the lower end and the limiting ring 48 is limited by a locating platform provided on the inner wall of the piston cavity and a guiding sleeve 47 installed at the lower port of the piston cavity.
  • the guiding sleeve 47 is sleeved on the guiding axis 49.
  • the limiting ring 48 comprises limiting rings opened oppositely.
  • the locating ring 61 installed in the locating circular groove 411 of the columnar joint 41 is locating ring opened oppositely.
  • Limiting sleeves 62 are further sleeved out of the limiting rings 61 and the upperside of the limiting sleeves 62 are limited by a retainer ring 63 and a snap spring 64.
  • the columnar joint 41 is provided peripherally with a seal groove 412 and the seal groove 412 is located above the locating circular groove 410 to ensure that gas passage tightness.
  • a construction method of a combined down-the-hole hammer according to the disclosure will be illustrated below in combination with Fig. 10 to Fig. 15 .
  • a hollow screw drill rod 5 can be also used in Step 1.
  • Step 2 before fixedly splicing the combined down-the-hole hammer 100 and the columnar drill rod 5 by two pin shafts 13 and a sealing ring 14, a gas flow regulator 26 in a gas collection chamber 21 of the combined down-the-hole hammer 100 can be regulated to a set value according to the output rotating speed of the power head 7 of the drill and the parameters of the gas supply system 8 of the drill so that flows can be distributed reasonably, thus utilizing the energy efficiently and improving the drilling efficiency.
  • the combined down-the-hole hammer according to the disclosure is matched with a screw drill rod so as to achieve better discharge effect, higher construction efficiency and higher economical efficiency, and drill deeper holes in the condition of the same gas supply amount.
  • the combined down-the-hole hammer is especially applicable to hard strata, especially rocks to construct large-diameter ( ⁇ 500 to ⁇ 800 and diameters larger than ⁇ 1000) foundation piles efficiently.
  • the disclosure provides a combined down-the-hole hammer with low cost, rational structure, easy maintenance, convenient installation and disassembly, reliable seal, efficient energy utilization and high drilling efficiency.
EP11827980.1A 2010-09-30 2011-06-23 Combined down-the-hole hammer Active EP2623705B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN 201020550979 CN201786251U (zh) 2010-09-30 2010-09-30 一种组合式潜孔锤
CN 201020550985 CN201786252U (zh) 2010-09-30 2010-09-30 一种自公转组合式潜孔锤
CN 201010298838 CN101949261B (zh) 2010-09-30 2010-09-30 组合式潜孔锤及其施工方法
CN 201020550973 CN201786250U (zh) 2010-09-30 2010-09-30 组合式潜孔锤
CN 201010298875 CN101967955B (zh) 2010-09-30 2010-09-30 一种自公转组合式潜孔锤及其施工方法
PCT/CN2011/076226 WO2012041084A1 (zh) 2010-09-30 2011-06-23 组合式潜孔锤

Publications (3)

Publication Number Publication Date
EP2623705A1 EP2623705A1 (en) 2013-08-07
EP2623705A4 EP2623705A4 (en) 2017-04-19
EP2623705B1 true EP2623705B1 (en) 2019-10-16

Family

ID=45891886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11827980.1A Active EP2623705B1 (en) 2010-09-30 2011-06-23 Combined down-the-hole hammer

Country Status (4)

Country Link
EP (1) EP2623705B1 (ko)
JP (1) JP5948333B2 (ko)
KR (1) KR101746822B1 (ko)
WO (1) WO2012041084A1 (ko)

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KR101460435B1 (ko) * 2013-03-26 2014-11-12 (주)동우기계 지반 굴착 장치
CN103790513B (zh) * 2014-03-03 2016-02-24 北京南车时代机车车辆机械有限公司 气动潜孔锤排渣装置
US9657521B2 (en) * 2014-06-02 2017-05-23 King Fahd University Of Petroleum And Minerals Directional system drilling and method
US11174684B2 (en) 2020-02-26 2021-11-16 Caterpillar Global Mining Equipment Llc Flushing system in drill bits
CN111270991A (zh) * 2020-04-13 2020-06-12 北京中岩大地科技股份有限公司 一种变幅式潜孔锤钻机及其施工方法
CN112196460B (zh) * 2020-09-08 2023-10-27 李新形 一种地下连续墙潜孔锤成槽机及其使用方法
CN113669002B (zh) * 2021-08-03 2023-12-08 深圳宏业基岩土科技股份有限公司 大直径灌注桩坚硬岩层组合式成孔施工方法
KR102607022B1 (ko) * 2021-10-19 2023-11-29 창신인터내셔날 주식회사 에어서플라이 모듈이 조립된 조합해머
CN115788280B (zh) * 2022-11-18 2023-09-26 浩洲钻科工程机械(山东)有限公司 独立式多通道全孔反循环集束式潜孔锤
CN117145378B (zh) * 2023-10-25 2024-02-02 长沙黑金刚实业有限公司 一种反循环冲击器

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JPH08312278A (ja) * 1995-05-17 1996-11-26 Koken Boring Mach Co Ltd 二重管掘削システム
EP0851090A1 (en) * 1996-06-19 1998-07-01 Suntech Corporation Down-the-hole hammer

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JPH05287975A (ja) * 1992-04-03 1993-11-02 Koken Kogyo Kk ダウンザホールドリルを使用するロータリテーブル型ボーリング機
JPH0813974A (ja) * 1994-06-28 1996-01-16 Kencho Kobe:Kk 地下穿孔機用スクリューロッドの接続構造
JPH08312278A (ja) * 1995-05-17 1996-11-26 Koken Boring Mach Co Ltd 二重管掘削システム
EP0851090A1 (en) * 1996-06-19 1998-07-01 Suntech Corporation Down-the-hole hammer

Also Published As

Publication number Publication date
WO2012041084A1 (zh) 2012-04-05
JP5948333B2 (ja) 2016-07-06
KR20130110175A (ko) 2013-10-08
EP2623705A1 (en) 2013-08-07
KR101746822B1 (ko) 2017-06-13
JP2013538957A (ja) 2013-10-17
EP2623705A4 (en) 2017-04-19

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