EP0324150B1 - Outil de forage - Google Patents

Outil de forage Download PDF

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Publication number
EP0324150B1
EP0324150B1 EP88121544A EP88121544A EP0324150B1 EP 0324150 B1 EP0324150 B1 EP 0324150B1 EP 88121544 A EP88121544 A EP 88121544A EP 88121544 A EP88121544 A EP 88121544A EP 0324150 B1 EP0324150 B1 EP 0324150B1
Authority
EP
European Patent Office
Prior art keywords
conveyor screw
bit
helix
support
drill
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.)
Expired - Lifetime
Application number
EP88121544A
Other languages
German (de)
English (en)
Other versions
EP0324150A1 (fr
Inventor
Bernhard Moser
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.)
Robert Bosch Power Tools GmbH
Original Assignee
Hawera Probst GmbH
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 Hawera Probst GmbH filed Critical Hawera Probst GmbH
Publication of EP0324150A1 publication Critical patent/EP0324150A1/fr
Application granted granted Critical
Publication of EP0324150B1 publication Critical patent/EP0324150B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion
    • 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
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E21B17/073—Telescoping joints for varying drill string lengths; Shock absorbers with axial rotation
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure

Definitions

  • the invention relates to a drilling tool according to the preamble of claim 1.
  • Drilling tools with interchangeable conveying coils are mainly used to produce breakthroughs using electrically or pneumatically driven rotary hammers.
  • the carbide-tipped drill head is designed as a cross drill or full drill head.
  • the conveying spiral is supported radially in its central position by means of elastic centering rings. Axial forces cannot be absorbed.
  • the prior art rotates the plug-on conveying coils by supporting them in the region of the radially protruding drill head.
  • the axial securing is done by means of separate support rings on the drill shank or by the stop of the drill chuck of the drive machine.
  • a loosely arranged on a drill shaft interchangeable conveyor helix is also loaded with each impact movement of the hammer in the axial direction, so that there is always a relative movement between the drill shaft or drill head and helix, which always leads to an impact of the conveyor helix against the stop on the drill head.
  • the impact stress caused thereby also leads to premature wear of the conveyor helix in the area of its support relative to the drill head.
  • the invention has for its object to provide a drilling tool with a helix not firmly connected to the drill shaft, in which the wear of the helix, preferably made of plastic or other impact-sensitive material, is reduced by the stress during operation.
  • the drilling tool according to the invention has the advantage over the known devices that the service life of the conveyor helix is considerably increased.
  • an elastic intermediate member is provided for supporting or damping the forward axial movement of the conveying helix, whereby the impacts on the helix are damped.
  • the desired and permissible axial movement of the conveyor helix to avoid axial forces or to prevent blocking is accordingly damped in the end position.
  • the impact load during hammer drilling on the helix is considerably reduced or dampened, particularly in the case of plastic conveying coils, so that the deformations which otherwise occur by cutting the contact contour of the drill head are avoided.
  • the damping support of the feed helix with respect to the drill head or the drill shaft is effected by an elastic support element made of rubber, this support element being formed according to subclaim 3 from rubber pins or rubber bolts or the like. These rubber bolts are embedded in bores in the upper region of the helix in such a way that the helix is supported by these bolts with respect to the drill head.
  • a rubber O-ring can also be used, which is inserted either in a groove in the drill shaft or in a groove in the feed spiral.
  • the conveyor helix is supported with respect to the drill head or the drill shaft via this O-ring.
  • a spiral spring is provided in a manner known per se at the end of the feed helix facing away from the drill head.
  • the drilling tool (1) shown in Figures 1 to 3 consists of a drill shaft (2) and drill head (3) which is designed as a cross drill bit, as is known for example from DE-OS 34 26 977, in particular Figures 3 and 4 .
  • the attachable and exchangeable conveying helix (4) is connected to the drill head (3) in a positive and non-rotating manner.
  • the feed helix (4) shown in Figures 1 to 3 is designed as a fully profiled plastic slip-on helix, ie the feed helix has a conventional drill helix profile.
  • Such full plastic filaments are known, for example, from DE 36 14 010 A1 or US Pat. No. 3,372,763.
  • a wound conveying helix can also be used, provided that this also causes the problem of increased wear on the conveying helix due to the corresponding load. This problem mainly occurs on a full-profile plastic spiral.
  • the elastic support element (5) is formed by two bolts (6) embedded in the helix (4) in the axial direction.
  • the helix (4) has an inner bore (7) into which the opposite two bolts (6) are inserted in such a way that they touch the outer flank (8) of the arcuate extension (9) of the cross drill bit (3).
  • the bolts (6) can also be arranged obliquely in corresponding bores (7) in order to strike the impact surface (8) as perpendicularly as possible.
  • the conveyor helix (4) is therefore supported against the drill head (3) by means of the rubber bolts (6).
  • the rubber bolts (6) act as a damping link between the feed screw (4) and the drill head (3).
  • the rotational entrainment of the conveyor helix (4) is ensured by a positive engagement (11) of the upper region of the conveyor helix (4) in a manner known per se.
  • the conveyor helix (4) in Fig. 1 is supported at its lower end by a spiral spring (12), which allows the conveyor helix to s1 by an axial amount in the direction can move to the clamping end of the drilling tool so that the feed helix can turn freely against the drill head (3), if necessary when jamming.
  • the coil spring (12) is then compressed to the amount s2.
  • the conveyor spiral (4) and the spiral spring (12) are held in their axial position by the support ring (13).
  • the elastic support element (5) is designed as a spiral spring (14).
  • the plastic conveyor spiral (4) has an enlarged inner bore (15) in its upper region with a stop collar (16) for the spiral spring (14).
  • the slip-on helix is then pushed out over the drill shaft (2) against the force of the spiral spring (14) and fixed in its axial position with a lower support ring (13).
  • the spiral spring (14) presses the plug-on helix (4) in the direction of the drill shaft (arrow 17), whereby the contact surface between the drill head (3) and the feed helix (4) is relieved of axial loads.
  • the fixing of the axial position of the conveyor spiral (4) in the lower region can also be equipped with an additional spring, as is shown in FIG. 1 with the spiral spring (12).
  • the conveyor spiral (4) would be axially displaceable between spiral springs (12 and 14).
  • the conveying helix (4) is supported by an O-ring (18) which has a groove (19) in the drill shaft (2).
  • the helix (4) has a hole for this (15 '), which is designed similarly or identically, as in the embodiment according to Fig. 2. If you push the feed screw against the drill head (3), the axial position is by meeting the O-ring (18) with the stop collar ( 16 ') of the bore (15') fixed.
  • a lower support spring (12) with a support ring (13) in accordance with the design according to FIG. 1 is again provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)

Claims (6)

  1. Outil de forage pour réaliser des brèches dans du béton ou de la maçonnerie, comportant une tête de forage revêtue de métal dur et une hélice de transport interchangeable, montée de façon assurée contre une torsion et axialement fixe, ladite hélice étant réalisée en matière synthétique ou en métal, et s'appuyant dans la zone de la tête de forage, l'hélice de transport (4) étant sollicitée axialement contre la tête de forage (3) ou l'arbre (2) de l'outil de forage au moyen d'un ressort spiral (12,14) réalisé en tant que ressort de pression et l'appui ou la sollicitation axial de l'hélice de transport (4) par rapport à la tête de forage (3) étant obtenu au moyen d'un élément d'appui élastique (5,6,14,18) dans le sens d'un déplacement amorti de l'hélice de transport (4).
  2. Outil de forage selon la revendication 1,
    caractérisé en ce que, pour l'appui amorti de l'hélice de transport (4) par rapport à la tête de forage (3) ou à l'arbre (2) de l'outil de forage, l'hélice de transport (4) présente, dans sa zone proche de la tête de forage (3), au moins un élément d'appui élastique (5) en caoutchouc (6,18) ou analogue.
  3. Outil de forage selon la revendication 2,
    caractérisé en ce qu'au moins deux chevilles en caoutchouc (6) ou analogues, encastrées dans l'hélice de transport (4) et orientées en direction de la tête de forage, sont prévues, lesquelles sont agencées de façon axialement orientée ou perpendiculairement à la surface d'appui de la tête de forage.
  4. Outil de forage selon la revendication 2,
    caractérisé en ce qu'une bague annulaire (18) est logée dans une gorge (19) de l'arbre (2) de l'outil de forage ou dans une gorge de l'hélice de transport (4).
  5. Outil de forage selon le revendication 1,
    caractérisé en ce que, pour l'appui amorti de l'hélice de transport (4) par rapport à la tête de forage (3) ou à l'arbre (2) de l'outil de forage, un ressort spiral (14) est prévu pour l'appui axial, l'hélice de transport présentant un évidement (15) à butée (16) pour le ressort spiral (14) et l'hélice de transport (4) étant avantageusement fixée axialement par une bague d'appui (13).
  6. Outil de forage selon une ou plusieurs des revendications précédentes,
    caractérisé en ce que l'hélice de transport (4), à son extrémité opposée à la tête de forage (3), est supportée au moyen d'un ressort spiral (12) à bague d'appui (13).
EP88121544A 1988-01-12 1988-12-23 Outil de forage Expired - Lifetime EP0324150B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3800611 1988-01-12
DE3800611A DE3800611A1 (de) 1988-01-12 1988-01-12 Bohrwerkzeug

Publications (2)

Publication Number Publication Date
EP0324150A1 EP0324150A1 (fr) 1989-07-19
EP0324150B1 true EP0324150B1 (fr) 1992-12-09

Family

ID=6345112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88121544A Expired - Lifetime EP0324150B1 (fr) 1988-01-12 1988-12-23 Outil de forage

Country Status (2)

Country Link
EP (1) EP0324150B1 (fr)
DE (2) DE3800611A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3805657C2 (de) * 1986-10-18 1996-04-25 Hawera Probst Kg Hartmetall Bohrwerkzeug mit austauschbarer Förderwendel
EP0799966A3 (fr) * 1996-04-02 1999-02-03 GEISERT ENGINEERING GmbH Trépan de forage à percussion
WO2021050334A1 (fr) * 2019-09-12 2021-03-18 Baker Hughes, A Ge Company, Llc Ensemble support de trépan incorporant un amortisseur d'oscillations de torsion à haute fréquence

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE269356C (fr) *
DE2543578C2 (de) * 1975-09-30 1986-03-06 Friedrich Duss Maschinenfabrik GmbH & Co, 7265 Neubulach Gesteinsbohrer
DE3044775A1 (de) * 1980-11-27 1982-07-08 Hilti AG, 9494 Schaan Gesteinsbohrer
DE8514422U1 (de) * 1985-05-15 1985-07-18 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrwerkzeug mit austauschbarer Förderwendel
DE3635538A1 (de) * 1986-10-18 1988-04-28 Hawera Probst Kg Hartmetall Bohrwerkzeug mit austauschbarer foerderwendel

Also Published As

Publication number Publication date
DE3800611A1 (de) 1989-07-20
DE3876612D1 (de) 1993-01-21
EP0324150A1 (fr) 1989-07-19

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