EP0141728A2 - Schalldämpfer für Bohrer - Google Patents

Schalldämpfer für Bohrer Download PDF

Info

Publication number
EP0141728A2
EP0141728A2 EP84402129A EP84402129A EP0141728A2 EP 0141728 A2 EP0141728 A2 EP 0141728A2 EP 84402129 A EP84402129 A EP 84402129A EP 84402129 A EP84402129 A EP 84402129A EP 0141728 A2 EP0141728 A2 EP 0141728A2
Authority
EP
European Patent Office
Prior art keywords
elongated rod
sheath
hammer
cylindrical
ring
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.)
Granted
Application number
EP84402129A
Other languages
English (en)
French (fr)
Other versions
EP0141728A3 (en
EP0141728B1 (de
Inventor
Frédéric Etienne Marcel
François Jean Marie Maume
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.)
Charbonnages de France CDF
Original Assignee
Charbonnages de France CDF
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 Charbonnages de France CDF filed Critical Charbonnages de France CDF
Priority to AT84402129T priority Critical patent/ATE48783T1/de
Publication of EP0141728A2 publication Critical patent/EP0141728A2/de
Publication of EP0141728A3 publication Critical patent/EP0141728A3/fr
Application granted granted Critical
Publication of EP0141728B1 publication Critical patent/EP0141728B1/de
Expired 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/006—Accessories for drilling pipes, e.g. cleaners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/11—Arrangements of noise-damping means

Definitions

  • the subject of the invention is a device which has the role of appreciably reducing the noise produced by a foil during the drilling of a hole, in a mine for example.
  • a foil is coupled to the motor shaft of a pneumatic or hydraulic hammer which imposes on it a movement of rotation and percussion.
  • the hammer is itself installed on a drilling jumbo supporting several hammers.
  • the noise created is considerable; it reaches and exceeds 110 dB. It is a cause of irreversible occupational diseases, including deafness, for staff working nearby.
  • the invention relates to a device for attenuating noise due to the foil.
  • the latter comprises an elongated rod whose profile in cross section is most often polygonal, or sometimes cylindrical, with a first end part which has a forged flange for coupling with the hammer, and a second end part which is provided with '' a cutter with a larger diameter than that of the stem.
  • the cutter can be in one piece with the rod; it can also be attached to it, for example using a thread.
  • the cutter comprises an end cutting part with a frustoconical profile, the largest diameter of which, that of the end face with cutting edges, determines the diameter of the drilled hole; behind this end part the cutter comprises a cylindrical body whose diameter is much greater than that of the rod.
  • the main object of the invention is to achieve a device for attenuating noise from a drill bit whose efficiency is at least comparable to that of the device mentioned above, but the cost of which is clearly lowered and whose the service life is greatly increased.
  • a device comprises a plastic sheath with an external diameter substantially equal to the diameter of the body of the cutter, with an internal diameter significantly greater than the diameter or the largest transverse dimension of the rod, two means of mounting placed respectively at the two opposite ends of the sheath, to support the latter around the rod, these means being mounted on the rod free in rotation and in translation, relative to the latter, at least the means located near the cutting edge being in tight contact with the surface of the rod in order to oppose drilling the entry of debris from between the sheath and the rod.
  • a cylindrical bearing surface is produced on the rod at the location provided for the mounting means close to the cutting edge.
  • the sheath is advantageously a semi-rigid plastic tube, of the type used for water pipes, commercially available. It is also possible, but not preferred, to use a flexible plastic tube, such as a garden hose for example. However, it is desirable that the sheath does not float excessively around the foil, as a flexible sheath can do. In addition it is also preferable, for better soundproofing efficiency, that the sheath does not come into contact with the stem of the foil, between the mounting means.
  • the foil 1 shown comprises an elongated rod 2 which has in cross section, in this example, a hexagonal profile, with a first end portion 3 provided with a forged flange 4 for its coupling with a pneumatic hammer 5 shown partially, in phantom . At its opposite extreme part 6, the foil 1 is provided with a cutting edge 7.
  • the cutting edge 7 and the rod 2 are joined by screwing the first onto the second; this ends for this purpose by a threaded end portion 11 which follows a machined cylindrical seat 12.
  • the latter replaces the hexagonal profile of rod 2 over a short length.
  • a plastic sheath 13 surrounds the rod 2 between the cylindrical seat 12 and an area 14 close to the pneumatic hammer 5.
  • the means for mounting the sleeve 13 is a ring 15 fitted in the sleeve 13; this ring 15 preferably has a shoulder 16 followed by a larger outside diameter advantageously equal to the outside diameter of the sleeve 13. The latter is applied by its annular end face against the shoulder 16
  • the ring 15 is preferably made of plastic material favorable to sliding, for example polytetrafluoroethylene (PTFE) or similar material. It is fitted tightly into the sleeve 13 and its inner cylindrical face is provided with at least one seal and preferably with two seals 17 which provide the seal with respect to the cylindrical seat 12.
  • PTFE polytetrafluoroethylene
  • the means for mounting the sheath 13 is a centering and spacing ring 18. This end being much less exposed to debris, the achievement of a perfect seal is not as necessary there. .
  • the ring 18 internally contains the extreme part of the sheath 13 and it has an extreme transverse wall 19 pierced with a hole 20 which allows free passage to the hexagonal rod 2.
  • the sealing can be improved by a thick washer 21 which also surrounds the elongated rod 2 to come s / apply against the outer face of the end wall 19.
  • the ring 18 and the thick washer 21 are also made of PTFE.
  • the ring 18 keeps the sheath 13 away from the elongated rod 2 and does not allow it to rotate with it. This condition explains the need for a cylindrical bearing surface with good sliding of the sealed ring 15 close to the cutting edge 7. It is however possible within the framework of the invention to line the inner surface 13A of the sheath 13, between the rings 15 and 18, a layer of acoustically insulating material, such as a suitable foam (not shown) known per se, provided that it does not come into contact with the elongated rod 2 and that it does not risk causing the drive in rotation of the sheath 13.
  • a layer of acoustically insulating material such as a suitable foam (not shown) known per se
  • a flexible plastic tube could be adopted provided that its flexibility is not such that it collapses transversely until it comes into contact with the elongated rod 2. On the other hand, it curves by deviating from a rectilinear path during drilling operations. It is desirable for the sheath 13 to curve in the same way without ceasing to remain apart from the elongated rod 2, without presenting the risk of floating around the latter as a too flexible tube could do.
  • a semi-rigid commercial plastic tube for example polyvinyl chloride, suitable.
  • the device of the invention has a certain effectiveness against the sound radiation of the foil.
  • the sheath 13 enters the hole drilled by the cutter 7; its outside diameter is preferably less than or at most equal to that of the body of the cutter, so that it allows the evacuation of drilling debris without imposing unacceptable stresses on the foil because of the freedom which is given to it in rotation and longitudinally with respect to the elongated rod 2.
  • Tests were carried out with an RK50 type pneumatic hammer from the French company Maco-Meudon.
  • the foil was intended to drill a 48 mm hole; it had a length of 108 mm and a thickness on plates of 25 mm.
  • the sheath 13 was a semi-rigid PVC tube having inner and outer diameters of 34 mm and 40 mm respectively, and a total length of 3040 mm.
  • the sound emission due to the foil alone measured at 1 m was 115.5 dB (A) (three point antenna) and 102 dB (A) measured at 5 m at one point.
  • the same measurements gave the following figures respectively: 103.8 and 89 dB (A).
  • the pneumatic hammer was supplied with compressed air at a pressure of 6 bars and the drilling speed was approximately 87 cm / min.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (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)
  • Earth Drilling (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Drilling Tools (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Noise Elimination (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
EP84402129A 1983-10-24 1984-10-23 Schalldämpfer für Bohrer Expired EP0141728B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84402129T ATE48783T1 (de) 1983-10-24 1984-10-23 Schalldaempfer fuer bohrer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8316879 1983-10-24
FR8316879A FR2553697B1 (fr) 1983-10-24 1983-10-24 Dispositif d'insonorisation d'un fleuret de foration

Publications (3)

Publication Number Publication Date
EP0141728A2 true EP0141728A2 (de) 1985-05-15
EP0141728A3 EP0141728A3 (en) 1985-06-19
EP0141728B1 EP0141728B1 (de) 1989-12-20

Family

ID=9293432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84402129A Expired EP0141728B1 (de) 1983-10-24 1984-10-23 Schalldämpfer für Bohrer

Country Status (10)

Country Link
US (1) US4591009A (de)
EP (1) EP0141728B1 (de)
JP (1) JPS60133193A (de)
AT (1) ATE48783T1 (de)
AU (1) AU567589B2 (de)
CA (1) CA1235074A (de)
DE (1) DE3480772D1 (de)
ES (1) ES282200Y (de)
FR (1) FR2553697B1 (de)
ZA (1) ZA848261B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE518390C2 (sv) * 2000-06-20 2002-10-01 Sandvik Ab Borrverktyg försett med dämpelement avsett för hålborrning i metalliska material
SE522081C2 (sv) * 2000-12-06 2004-01-13 Sandvik Ab Verktyg för bearbetning i metalliska material
WO2003009974A1 (en) * 2001-07-26 2003-02-06 Nicolaas Daniel Lombard Burger Rock drill silencing apparatus
US8342264B1 (en) 2009-03-09 2013-01-01 J.H. Fletcher & Co. Device for reducing drilling noise and related methods
SE534173C2 (sv) 2009-08-28 2011-05-17 Atlas Copco Secoroc Ab Borrsträngskomponenet med vibrationsdämpande struktur anordnad i anslutning till åtminstone en del av dess insida

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1401587A (fr) * 1964-06-09 1965-06-04 Silencieux pour outils actionnés par un moteur à air comprimé
GB1055048A (en) * 1964-10-19 1967-01-11 Atlas Copco Ab Improvements in noise deadening means for percussive tools
US3819168A (en) * 1972-06-07 1974-06-25 Allied Chem Drill shaft
US3848931A (en) * 1972-10-10 1974-11-19 Int Tool Sales Tool bit for vibration attenuation
SE390188C (sv) * 1973-12-03 1979-10-08 Sandvik Ab Borrstang for slaende bergborrning
US3926265A (en) * 1974-06-10 1975-12-16 Hydroacoustic Inc Drill steel for percussive drilling devices
ZA752698B (en) * 1975-04-25 1976-12-29 Boart Int Ltd Improvements in rock slotting equipment
GB1525145A (en) * 1975-10-09 1978-09-20 Atlas Copco Ab Vibration-damped impact tool
SE413747B (sv) * 1976-02-04 1980-06-23 Atlas Copco Ab Slaende verktyg
US4108258A (en) * 1976-07-21 1978-08-22 Atlas Copco Aktiebolag Rock drilling apparatus with noise reducing drill rod cover
FR2388646A1 (fr) * 1977-04-29 1978-11-24 Maco Meudon Sa Marteau brise-beton equipe de dispositifs silencieux
FI60514C (fi) * 1978-07-04 1982-02-10 Tampella Oy Ab Ljuddaempare foer borrmaskin
DE2851160A1 (de) * 1978-11-25 1980-06-04 Wacker Werke Kg Vorrichtung zum mindern der geraeuschentwicklung an den werkzeugen von bohr- und aufbruchhaemmern
SE8002589L (sv) * 1980-04-03 1981-10-04 Atlas Copco Ab Borrstal samt borrmaskin for anvendning med ett sadant borrstal
DE3044775A1 (de) * 1980-11-27 1982-07-08 Hilti AG, 9494 Schaan Gesteinsbohrer
DE3269795D1 (en) * 1981-06-10 1986-04-17 Ruhrkohle Ag Noise damping means for drilling rods

Also Published As

Publication number Publication date
EP0141728A3 (en) 1985-06-19
AU567589B2 (en) 1987-11-26
US4591009A (en) 1986-05-27
JPS60133193A (ja) 1985-07-16
ES282200Y (es) 1985-11-01
ZA848261B (en) 1985-06-26
CA1235074A (fr) 1988-04-12
EP0141728B1 (de) 1989-12-20
DE3480772D1 (de) 1990-01-25
FR2553697A1 (fr) 1985-04-26
AU3427984A (en) 1985-05-02
FR2553697B1 (fr) 1986-03-14
ES282200U (es) 1985-04-01
ATE48783T1 (de) 1990-01-15

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