JPH01284690A - Rock drill with drill head - Google Patents

Rock drill with drill head

Info

Publication number
JPH01284690A
JPH01284690A JP1064021A JP6402189A JPH01284690A JP H01284690 A JPH01284690 A JP H01284690A JP 1064021 A JP1064021 A JP 1064021A JP 6402189 A JP6402189 A JP 6402189A JP H01284690 A JPH01284690 A JP H01284690A
Authority
JP
Japan
Prior art keywords
rock
drill
hole
drill head
drilling
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.)
Pending
Application number
JP1064021A
Other languages
Japanese (ja)
Inventor
Josef Obermeier
ヨゼフ・オーベルメイアー
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.)
Hilti AG
Original Assignee
Hilti AG
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
Application filed by Hilti AG filed Critical Hilti AG
Publication of JPH01284690A publication Critical patent/JPH01284690A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • 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
    • E21B10/00—Drill bits
    • E21B10/02—Core bits
    • E21B10/04—Core bits with core destroying means
    • 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
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

PURPOSE: To accurately bore a deep hole having a geometrical shape, and to reduce a manufacturing cost by joining a cylindrical part having a blade body on the front periphery and having a constant inside diameter and external shape in the pressing direction to a part for expanding an inside diameter and an outside diameter. CONSTITUTION: A conical part 3 having an inside diameter and an outside diameter expanding in the pressing direction and having a through port 6 for discharging boring chips is formed on the tip of a shaft part 1 having a long groove 2 in a rear end part. Next, a cylindrical part 4 having the length L being almost 0.2 time to 3 times an outside diameter D and having a pin-shape blade body 9 on the periphery of a cutting edge 5 of a front end part is joined to the conical part 4. A center hole drill 8 projecting in the shaft direction is arranged in a receiving hole 7 to constitute a drill head. Thus, a rock drill can be manufactured by extrusion molding, a manufacturing cost can be reduced, thrust can be excellently transmitted, a boring tool can be excellently guided to a hole, and the hole can be accurately bored.

Description

【発明の詳細な説明】 本発明はドリルヘッドを備える鑿岩機に関するものであ
って、このトリルヘッドは、内径及び外径において押圧
方向に拡大した部分を有し、この部分は少なくとも基本
的には軸方向に延在する貫通口を備え、この貫通口は穿
孔くずのために外側輪郭に開口している。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rock drilling machine equipped with a drill head, the drill head having a portion enlarged in the pressing direction on an inner diameter and an outer diameter, this portion being at least basically axially A through hole is provided which extends in the direction and opens into the outer contour for the drilling waste.

独国公開公報第２８５６２０５号で開示されている鑿岩
機は軸部と前端部に釣り鐘状に構成されたドリルヘッド
とを有している。ドリルへンドにはその前面にピン状刃
体を備えている。その上に、ドリルヘッドは周囲から放
射状に出る溝穴を有する。The drilling machine disclosed in DE 2856205 has a shaft and a bell-shaped drill head at its front end. The drill head is equipped with a pin-shaped blade on the front side. Additionally, the drill head has slots radiating from the periphery.

この溝穴は穿孔くずの排出の機能を果たす。このドリル
ヘッドの案内面は小さいので、正確な孔、例えば機械的
ないし拡開式ダウェルを受容するだめの孔を形設するの
は難しい。このような構成になっているので、この穿孔
工具の製作は鍛造とそれに続く機械加工によってのみ可
能で、それは製作費を高くする。This slot serves the function of draining drilling debris. Due to the small guide surface of this drill head, it is difficult to form precise holes, such as holes for receiving mechanical or expansion dowels. Due to this configuration, the production of this drilling tool is only possible by forging and subsequent machining, which increases the production costs.

独国公開公報第３０４１１３５号でも又鑿岩機が開示さ
れている。この慇岩機の軸部の外径ば押圧方向に円錐形
に増大する。この穿孔工具は閉塞された釣り鐘状の形状
部を有する。そのため、この穿孔工具による孔の深さに
は限界がある。壁厚が厚い壁にこの穿孔工具で穿孔する
場合、段階毎に孔の核部を取り除く必要があるので、多
くの段階が連続することになる。German publication no. 3041135 also discloses a chisel machine. The outer diameter of the shaft of this rock machine increases conically in the pressing direction. This drilling tool has a closed bell-shaped section. Therefore, there is a limit to the depth of holes made by this drilling tool. When drilling a wall with a large wall thickness using this drilling tool, many steps are performed in succession, since the core of the hole must be removed in each step.

これらの既知の慇岩機に加えて、独国特許公報第２９２
８４４５号では釣り鐘状のたがね工具が開示されている
。このたがね工具は衝撃を与える手工具と共に使用され
る。この工具はその外面及び内面で少なくとも部分的に
押圧方向に拡大している。In addition to these known Keiyan machines, German Patent Publication No. 292
No. 8445 discloses a bell-shaped chisel tool. This chisel tool is used with impact hand tools. The tool is at least partially enlarged in the pressing direction on its outer and inner surfaces.

この工具の穿孔方向の前面は環状刃体として構成されて
いる。更に、この工具は貫通口を有していて、この貫通
口は長手方向軸に対し斜めに配設され、内面から外面に
貫通している。この貫通口は穿孔くずの排出口として機
能し、穿孔くずは円錐形の内部形状により破砕され、ば
らばらにされる。The front surface of this tool in the drilling direction is configured as an annular blade. Furthermore, the tool has a through hole, which is arranged obliquely to the longitudinal axis and passes through from the inner surface to the outer surface. This through hole functions as an outlet for drilling waste, which is crushed and broken up by the conical internal shape.

純粋に打ち込み操作を主眼とする構成のため、土中に穴
を明ける為に使用するこの工具には案内に関しての要求
は無い。Since this tool is designed for purely driving operations, there are no requirements for guidance for this tool, which is used for drilling holes in the soil.

本発明の目的は正確な幾何学的形状を持つ深い孔を穿孔
するのに適し、かつ製作費の安い慇岩機を提供すること
である。SUMMARY OF THE INVENTION The object of the present invention is to provide a drilling machine suitable for drilling deep holes with precise geometry and which is inexpensive to manufacture.

本発明により、この目的は次のようにして達成される。According to the invention, this objective is achieved in the following way.

即ち、内径及び外径が一定の円筒形部が内径及び外径が
拡大する部分に押圧方向で結合し、円筒形部の前面には
周囲に沿って刃体を備えることにより達成される。That is, this is achieved by connecting a cylindrical part with constant inner and outer diameters to a part with increasing inner and outer diameters in the pressing direction, and providing a blade along the periphery on the front surface of the cylindrical part.

本発明で提示されている形状は製作費を軽減することを
可能とし、特に押し出し成型による製作を可能としてい
る。これに加えて、何よりもまず、材料強度上において
大きな飛躍が要求されていないと言う事情が決定的であ
る。その上、円筒形部は円錐形部と結合しているので、
材料の流れの見地から押し出し成型プロセスに対して理
想的前提を提供している。これに加えて、これにより、
推力のより良好な伝達が可能となる。The shape proposed in the invention makes it possible to reduce production costs and in particular allows production by extrusion. In addition to this, the decisive factor is that no major leap forward in material strength is required. Moreover, since the cylindrical part is connected to the conical part,
It provides ideal premises for the extrusion process from a material flow standpoint. In addition to this, this
Better transmission of thrust becomes possible.

円筒形部は内径及び外径が拡大する部分と押圧力向で結
合しているので、このため穿孔工具を孔に良好に案内す
ることができる。前面に配設された刃体ば地下物の掘削
をする機能がある。その際、ドリルヘッドの円錐形部の
前面に停滞している孔の核部ば粉砕され、ばらばらにさ
れる。生ずる穿孔くずはドリルヘッドから貫通口を通っ
て押し出され、必要ならばドリルヘッドに後方で結合し
ている輸送用螺旋部の領域に延在する。円錐形前端部に
は耐摩耗性素子を配設することができる。The cylindrical part is connected in a pressing direction to the part with increasing inner and outer diameters, so that the drilling tool can be guided into the hole in a better manner. The blade located on the front has the function of excavating underground objects. In this process, the core of the hole, which is lodged in front of the conical part of the drill head, is crushed and broken up. The resulting drilling waste is forced out of the drill head through the through hole and, if necessary, extends into the area of the transport helix which is connected to the drill head at the rear. A wear-resistant element can be arranged at the conical front end.

好適には、刃体は円筒形部より軸方向に突出しづ− ている。このため、円筒形部より突出している刃体は本
発明に係る穿孔工具による穿孔の際環状の溝を切り出す
。その際、ヘッド本体自体が地下物と直接接触すること
は殆ど無い。これにより、−方で、穿孔くずの良好な排
出を可能とし、他方でヘッド本体の摩耗を：Ｉｊｊ止す
る。Preferably, the blade body projects axially from the cylindrical part. Therefore, the blade protruding from the cylindrical portion cuts out an annular groove when drilling with the drilling tool according to the present invention. At that time, the head body itself almost never comes into direct contact with underground objects. This, on the one hand, allows good discharge of drilling debris and, on the other hand, prevents wear on the head body.

好適には、刃体は円筒形部より半径方向に突出している
。その際、外方にも内方にも突出させることができる。Preferably, the blade body projects radially beyond the cylindrical portion. In this case, it can be made to protrude both outward and inward.

これにより、自由な切り出しが可能となり、ヘッド本体
の円筒形部が孔壁と接触す′ることが防止される。This allows free cutting and prevents the cylindrical portion of the head body from coming into contact with the hole wall.

好適には、刃体はピン状に構成される。このような刃体
はドリルヘッドの穴に受容されることができ、それによ
り、適所に正確に位置決めされることができる。その際
、これに加えて、刃体の製作は簡単で、かつ使用の際、
必要とあらばそれ自身の交換をすることができる。Preferably, the blade body is configured in the form of a pin. Such a blade can be received in a hole in a drill head and thereby precisely positioned in position. In addition to this, the blade body is easy to manufacture, and when used,
It can do its own replacement if necessary.

好適には、円筒形部の長さは外径の０．２倍から３倍で
ある。円筒形部の長さがこの範囲にあると良好な案内が
できる。Preferably, the length of the cylindrical portion is between 0.2 and 3 times the outer diameter. If the length of the cylindrical portion is within this range, good guidance can be achieved.

−６＝ 穿孔操作のため及び穿孔作業の続行のため、好適には、
ドリルヘッドにはドリルヘッドより軸方向に突出したセ
ンター孔ドリルが設けである。穿孔過程の始めはまず最
初にセンター孔ドリルが地下物に導入される。その後、
ドリルヘッドは地下物に進入し、センター孔ドリルによ
り穿孔工具が横方向に進むことが防止される。センター
孔ドリルは比較的摩耗を受は易く、この理由から、この
工具は故障の際即応することができるように、センター
孔ドリルは交換できるようにするべきであ゛る。-6 = For the drilling operation and for the continuation of the drilling operation, preferably:
The drill head is provided with a center hole drill that protrudes from the drill head in the axial direction. At the beginning of the drilling process, a center hole drill is first introduced into the underground structure. after that,
The drill head enters the underground structure and the center hole drill prevents the drilling tool from advancing laterally. The center hole drill is relatively susceptible to wear and for this reason it should be possible to replace the center hole drill so that the tool can be quickly replaced in the event of a failure.

添付図面を参照して以下により詳細に本発明を説明する
。The invention will be explained in more detail below with reference to the accompanying drawings.

第１図から第３図までに示す鑿岩機は基本的には軸部１
から構成されていて、軸部１にはその後部の端部に長が
溝２が設りである。この長が溝２は軸方向の保持と穿孔
工具の駆動のためのロックの機能を果たす。軸部１は押
圧方向に拡大する円錐形部３を有し、円錐形部３の内径
及び外径は押圧方向に拡大している。円錐形部３には円
筒形部４が結合している。円筒形部４の長さしは外径り
のおよそ０．２倍から３倍である。円筒形部４の前端部
は環状のカンティングエツジ５として構成されている。The rock drill machine shown in Figures 1 to 3 basically has a shaft part 1.
The shaft portion 1 is provided with a long groove 2 at its rear end. This long groove 2 serves as a lock for axial retention and drive of the drilling tool. The shaft portion 1 has a conical portion 3 that expands in the pressing direction, and the inner diameter and outer diameter of the conical portion 3 are expanded in the pressing direction. A cylindrical part 4 is connected to the conical part 3. The length of the cylindrical portion 4 is approximately 0.2 to 3 times the outer diameter. The front end of the cylindrical part 4 is configured as an annular canting edge 5.

円錐形部３には貫通口６が設けてあって、貫通口６ばド
リルヘッドの内部に堆積する穿孔くずの排出の機能を果
たす。ドリルヘッドにはその内側にトリルヘッドより軸
方向に突出しているセンター孔ドリル８を受容するため
の受容孔７が設けである。穿孔過程の開始では、まず最
初にセンター孔ドリル８のみが穿孔すべき地下物の表面
に進入する。ドリルヘッドにはカシティングエツジ５の
所にピン状の刃体９が設けである。この刃体９では特に
硬質の金属ピンであることが重要である。しかし又、こ
の刃体９は板状に構成され、基盤に植設された合成ダイ
ヤモンドから構成することもできる。The conical part 3 is provided with a through hole 6 which serves the function of draining drilling debris that has accumulated inside the drill head. The drill head is provided with a receiving hole 7 on the inside thereof for receiving a center hole drill 8 projecting from the drill head in the axial direction. At the beginning of the drilling process, only the center hole drill 8 first enters the surface of the underground structure to be drilled. The drill head is provided with a pin-shaped blade 9 at the cutting edge 5. It is particularly important for this blade 9 to be a hard metal pin. However, the blade 9 can also be constructed in the form of a plate and made of synthetic diamond embedded in the base.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明に係る鑿岩機の部分的断面図；第２図は
第１図に示す矢印Ａから見た鑿岩機の図； 第３図は第１図に示す矢印Ｂから見た馨岩機の図でる。 １・・・軸部　　　　　　　２・・・長が溝３・・・円
錐形部　　　　　４・・・円筒形部５・・・カッティン
グエツジFigure 1 is a partial cross-sectional view of the rock drill machine according to the present invention; Figure 2 is a diagram of the rock rock machine seen from arrow A shown in Figure 1; Figure 3 is a diagram of the rock rock machine seen from arrow B shown in Figure 1. A diagram appears. 1...Shaft part 2...Length is groove 3...Conical part 4...Cylindrical part 5...Cutting edge

Claims (1)

【特許請求の範囲】 １、ドリルヘッドを備える鑿岩機であって、前記ドルリ
ヘッドは、内径及び外径において押圧方向に拡大した部
分を有し、この部分は少なくとも基本的には軸方向に延
在する貫通口を備え、この貫通口は穿孔くずのために外
側輪郭に開口している、ドリルヘッドを備える鑿岩機に
おいて、内径及び外径が一定の円筒形部（４）が内径及
び外径が拡大する前記部分（３）に押圧方向で結合し、
前記円筒形部（４）の前面には周囲に沿って刃体（９）
を備える、ことを特徴とする鑿岩機。 ２、前記刃体（９）は前記円筒形部（４）より軸方向に
突出していることを特徴とする請求項１に記載の鑿岩機
。 ３、前記刃体（９）は前記円筒形部（４）より半径方向
に突出していることを特徴とする請求項１又は２に記載
の鑿岩機。 ４、前記刃体（９）はピン状に構成されていることを特
徴とする請求項１から３のうちいずれか１項に記載の鑿
岩機。 ５、前記円筒形部（４）の長さ（Ｌ）は前記円筒形部（
４）の外径（Ｄ）の０．２倍から３倍であることを特徴
とする請求項１から４のうちいずれか１項に記載の鑿岩
機。 ６、前記ドリルヘッドには前記ドリルヘッドより軸方向
に突出するセンター孔ドリル（８）が設けてあることを
特徴とする請求項１から５のうちいずれか１項に記載の
鑿岩機。[Claims] 1. A rock drilling machine equipped with a drill head, wherein the drill head has a portion enlarged in the pressing direction on an inner diameter and an outer diameter, and this portion extends at least basically in the axial direction. In a rock drilling machine with a drill head, the cylindrical part (4) having a constant inner and outer diameter is enlarged in inner and outer diameters, with a through-hole opening on the outer contour for the drilling waste. coupled to the portion (3) in the pressing direction;
A blade body (9) is provided along the periphery on the front surface of the cylindrical part (4).
A chisel machine characterized by: 2. The rock rock machine according to claim 1, wherein the blade body (9) protrudes from the cylindrical portion (4) in the axial direction. 3. The rock rock machine according to claim 1 or 2, characterized in that the blade (9) protrudes radially from the cylindrical portion (4). 4. The rock rock machine according to any one of claims 1 to 3, wherein the blade body (9) is configured in a pin shape. 5. The length (L) of the cylindrical part (4) is the length (L) of the cylindrical part (4).
5. The rock rock machine according to claim 1, wherein the diameter is 0.2 to 3 times the outer diameter (D) of item 4). 6. The rock rock machine according to any one of claims 1 to 5, wherein the drill head is provided with a center hole drill (8) that projects in the axial direction from the drill head.
JP1064021A 1988-03-21 1989-03-17 Rock drill with drill head Pending JPH01284690A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3809428A DE3809428A1 (en) 1988-03-21 1988-03-21 STONE DRILL BIT
DE3809428.2 1988-03-21

Publications (1)

Publication Number Publication Date
JPH01284690A true JPH01284690A (en) 1989-11-15

Family

ID=6350274

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1064021A Pending JPH01284690A (en) 1988-03-21 1989-03-17 Rock drill with drill head

Country Status (5)

Country Link
EP (1) EP0334806B1 (en)
JP (1) JPH01284690A (en)
AT (1) ATE95888T1 (en)
DE (2) DE3809428A1 (en)
DK (1) DK125989A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5279607A (en) * 1991-05-30 1994-01-18 The State University Of New York Telemetry capsule and process
DE4236553A1 (en) * 1992-10-29 1994-05-05 Hawera Probst Kg Hartmetall Rock drill
DE4301191A1 (en) * 1993-01-19 1994-07-21 Hawera Probst Kg Hartmetall Rock drilling tool
CN102134850A (en) * 2011-01-08 2011-07-27 洪子云 Soil-sucking hole-forming bit of diamond drill
DE102011090063A1 (en) * 2011-10-13 2013-04-18 Robert Bosch Gmbh Hammer hollow
CN103383319A (en) * 2012-05-03 2013-11-06 中国石油化工股份有限公司 Sealed shape-retaining coring fresh-keeping processing mechanism for rock core, and fresh-keeping processing method thereof

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2334453A (en) * 1942-04-30 1943-11-16 Peter J Swofford Speed rock bit
DE2602238A1 (en) * 1976-01-22 1977-08-04 Bosch Gmbh Robert DRILL BIT
DE2807198A1 (en) * 1978-02-20 1979-08-30 Heller Verwaltungsges Cup-shaped boring tool mfr. - in which cutters are welded onto rim of cup and end of central drill
DE2856205A1 (en) * 1978-12-27 1980-07-10 Hilti Ag Rock drill head assembly - has protruding steel insets in ring segments with axial grooves and central recess
DE2913501A1 (en) * 1979-04-04 1980-10-16 Bosch Gmbh Robert Trepanning drill bit assembly - has passage to flushing seat from end face between cutters through shank
CH640304A5 (en) * 1979-06-13 1983-12-30 Inst Gornogo Dela Sibirskogo O DRILLING TOOL FOR DRILLING HOLES, ESPECIALLY FOR A SELF-DRIVING IMPACT MACHINE.
AT360734B (en) * 1979-08-17 1981-01-26 Swarovski Tyrolit Schleif HOLLOW DRILL
DE3049135A1 (en) * 1980-12-24 1982-07-15 Hawera Probst Gmbh + Co, 7980 Ravensburg DRILLS, ESPECIALLY DRILLING DRILLS
DE3515735C1 (en) * 1985-05-02 1987-01-15 Jaroslav Dvorak Boring head for a percussion boring device
DE3619334A1 (en) * 1986-06-09 1987-12-10 Erich Wezel Hollow drill bit crown

Also Published As

Publication number Publication date
EP0334806B1 (en) 1993-10-13
ATE95888T1 (en) 1993-10-15
DE58905867D1 (en) 1993-11-18
DK125989A (en) 1989-09-22
DE3809428A1 (en) 1989-10-12
EP0334806A1 (en) 1989-09-27
DK125989D0 (en) 1989-03-15

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