EP1641002A1 - Pics pour un dispositif de fraisage tenu magnétiquement - Google Patents

Pics pour un dispositif de fraisage tenu magnétiquement Download PDF

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Publication number
EP1641002A1
EP1641002A1 EP05020983A EP05020983A EP1641002A1 EP 1641002 A1 EP1641002 A1 EP 1641002A1 EP 05020983 A EP05020983 A EP 05020983A EP 05020983 A EP05020983 A EP 05020983A EP 1641002 A1 EP1641002 A1 EP 1641002A1
Authority
EP
European Patent Office
Prior art keywords
chisel
bit
holder
shank
magnetic force
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
EP05020983A
Other languages
German (de)
English (en)
Other versions
EP1641002B1 (fr
Inventor
Gerd Elfgen
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.)
Individual
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Individual
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Publication date
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Publication of EP1641002A1 publication Critical patent/EP1641002A1/fr
Application granted granted Critical
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Not-in-force legal-status Critical Current
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders

Definitions

  • the invention relates to a method for holding chisels of a milling device with a rotatable milling drum and a corresponding chiseling device according to the preambles of claims 1 and 2.
  • the state of the art is, for example, to hold a chisel by means of clamping sleeves in a so-called chisel holder, wherein the chisel, comprising a chisel head and a chisel shank, has a flat annular groove for receiving the clamping sleeve.
  • DE 37 01 905 C1 and DE 43 22 401 C2 disclose a special attachment of a bit to a holder by means of a clamping sleeve, which is to ensure that the Mei- ⁇ el is rotatable and should also be particularly easy to use by hammer blows.
  • DE 36 30 444 A1 describes a chisel, which is supported by an elastic ring axially from the chisel holder.
  • the ring is intended to absorb the impact forces acting on the bit head and thereby effectively reduce the stresses on a carbide contact element of the Mei- ⁇ elspitze, chisel head and holder, so as to increase the life of said elements.
  • the bit holder can also be inserted according to DE 43 22 401 C2 with a support shaft in a corresponding recess of a welded to the milling drum base and secured by a bolt.
  • Another known variant of the holder is to hold the bit by means of an O-ring of elastomeric plastic, which is clamped in the annular groove of the drill collar or the chisel holder.
  • the O-ring is compressed during the insertion of the respective chisel or chisel holding element in the corresponding holding device and prevented by its pressing effectively and reliably slipping out of the chisel or the chisel holding element.
  • a drill bit for applying, for example, coal formations, ore formations or road surfaces known in which in one embodiment a rotary drivable chisel consists of three parts which are form-fitting so nested, that a torque about the longitudinal axis of the chisel is transferable. While the torque transmission is done by connecting cross sections, which are not circular are securing the three parts against axial displacement by means of securing bolts, which penetrate adjacent parts in the radial direction.
  • the securing bolts are designed in the form of magnetic pins, so that the pins are prevented from moving out of the bores as a result of the vibrations occurring during operation of the bit and thus canceling out the fixation of the bit parts in the axial direction.
  • Another embodiment according to DE 697 09 793 T2 discloses a chisel rotatable about its longitudinal axis, which has at its shaft end a groove into which a U-shaped retaining plate engages.
  • a locking pin is used, which is arranged between the retaining plate and a stop of the bit holder. The magnetic force in turn prevents inadvertent slipping out of the locking pin, whereby the positive connection could be canceled.
  • a disadvantage of the bit holder system according to DE 697 09 793 T2 is that the removal of the magnetic pins is comparatively complicated and time-consuming, so that the desired simplification of the bit assembly and disassembly is hardly achieved.
  • the locking pins used are also very filigree parts, so that the handling is difficult.
  • the need for releasable mounting of chisels or chisel holders on the milling drum is due to the fact that in case of inevitable wear of the carbide chisel head except this as few components of the milling device to be replaced with. Accordingly, the chisel z. B a road milling machine usually bulk and the chisel holder, which must be replaced after several generations of worn chisels, compared to less frequently replaced components.
  • the base or lower part of such a swap-holder system should be spared from wear as completely as possible since the base part is welded onto the milling drum and renewal or replacement thereof is correspondingly complicated and cost-intensive.
  • the object of the invention is to present a bit holder method and a corresponding device for a road milling machine by which the elements affected by the holder are cheaper and easier to design and the times required for the removal and installation of chisels or chisel holders, can be shortened.
  • the object is procedurally achieved by the features of the characterizing part of claim 1.
  • Device-technically, the object is achieved by the features of the characterizing part of claim 2.
  • the reason for overestimating the required holding force is possibly the non-observance of an angle at which the shaft longitudinal axis of the corresponding element of the chiseling device is generally aligned with the milling drum, in particular with respect to its radius.
  • This angle is achieved that during a rotation of the roller centripetal force acting on the element, for the most part by adhesion and sliding friction between the shaft and shaft holder, compensated and the rest must be applied only by relatively suitable counter forces to a To prevent falling or flying out of the corresponding element effectively and safely.
  • the magnetic force can advantageously be chosen so that the bit can rotate, but can not be released from the holder, which is achieved, for example, by the realization of a precisely defined, in operation non-variable air gap between the drill collar and the magnet.
  • the chisel shaft is configured without a circumferential groove in its jacket perpendicular to its longitudinal axis, since such grooves, as for housing a clamping sleeve or an O-ring for fixing the chisel in the holder prior art and far are widespread, have a significantly more expensive in the production.
  • the costs are further saved and also the cost of mounting the clamping sleeves and the disc.
  • the chisel shank according to the invention can be smooth, i. without any recesses, but it can also have in its longitudinal direction extending recesses or grooves or grooves, since their production is less expensive and inexpensive possible.
  • the shank may also be provided with a holding sleeve, which surrounds it and is fitted in a groove in the manner of a clamping sleeve, in which the shank can rotate about its longitudinal axis.
  • the holding sleeve can be used in contrast to a conventional clamping sleeve without much effort manually in the bore of the holder.
  • the fixation of the clamping sleeve in the holder does not take place via radially acting, elastic clamping forces, but by means of magnetic force.
  • the retaining sleeve is preferably fixed by the magnetically caused adhesion to the magnet, which forms part of the lateral surface of the recess, i. Bore for the drill collar, make contact.
  • the retaining sleeve does not rotate about its axis, but the tool shank within the retaining sleeve, i. relative to this. Again, a removal of the bit can be done simply by the chisel is pulled out with sufficient force from the bore, so that the magnetic force is exceeded.
  • the magnetic force is caused by a permanent magnet, however, it may also be electromagnetically producible for particular applications.
  • the chisel holder itself may be the magnet or have magnetic components.
  • the shank of a chisel can be inserted into the ring opening and held by magnetic force. It is also advantageous to provide a magnetic element as a separate component, which may be reusable.
  • bit consists of at least two Mei- ⁇ elelementen of which at least one is magnetic or an electromagnet.
  • the chisel head as the earliest exchanged bit element in the simplest way interchangeable.
  • the invention can also be further developed in that a bit shank of the bit is cylindrical with, for example, a circular cross-section.
  • the cylindrical shape is particularly simple and therefore inexpensive to produce.
  • a special processing, such as undercutting by means of milling or lathes, forming grooves in the circumferential direction or the like, as required in conventional shank bits, can be saved.
  • a chisel with a purely cylindrical shank is therefore technically superior to all known chisels with conventional shanks.
  • the drill collar be provided with grooves extending in its longitudinal direction.
  • the grooves may be part-circular in cross section, resulting in comparatively sharp edges in the transition to the Schaftschis vom. These edges cause a scraper effect that prevents buildup of abrasion or other particles on the wall of the receiving bore.
  • a development of the invention also provides that the magnetic element in a recess of the bit holder can be introduced and in the immediate vicinity, but with a small air gap to the drill collar in its mounted state can be arranged.
  • the invention can advantageously be further developed in that the magnetic element is rod-shaped and at its end facing the drill collar corresponding to a penetration of the geometric body forming the recess for the drill collar with the cylinder enveloping the magnetic element, d. H. in particular concavely curved, shaped.
  • Such a shaping of the magnetic element ensures that the end face of the rod adapts to the cylindrical tool shank in a type of groove, and can therefore exert a greater magnetic force on it.
  • the magnetic element does not have to be aligned perpendicular to the drill collar, but can assume an angle to this, which prevents it from falling out even better.
  • the mei- ⁇ elschaft be provided with longitudinal grooves, without the risk that the magnetic force too weak.
  • the milling device according to the invention with a plurality of chiseling devices should be designed such that the chiseling devices are magnetically supported on the milling drum of the milling device at least in part.
  • an outer roller part of the milling drum, in particular a base part welded thereto, can be magnetic.
  • a simple replacement of all chiseling devices for the purpose of maintenance or conversion can be done in the electromagnetic variant simply by switching off the electric current.
  • the chiseling device 100 shown in FIG. 1 is welded with a base part 120 to a milling drum 200 of a milling device not shown in more detail.
  • the chiseling device 100 has, in addition to the base part 120, a chisel holder 130 (so-called change holder) consisting of chisel holder shaft 132 and chisel holder upper part 134 and a chisel 160 consisting of a chisel head 164 with carbide tip 165 and a chisel shaft 168 inserted in a receiving bore 135 of the chisel holder upper 134 ,
  • a cylindrical magnet element 110 has a groove 112 (see FIG. 1 a) with the same radius 114 that the tool shank 168 also has. It is inserted into a receiving bore 135 within the bit holder upper part 134 and connected to it by adhesive, for example. Of course, a connection can also be achieved by brazing or spot welding.
  • the magnetic element 110 causes by magnetic force that the Although chisel rotatable against a certain resistance, which is absolutely necessary for wear reasons, but not force-free, but only with a threshold exceeding force from the bit holder shell 134 is pulled out.
  • the end face 111 of the magnetic element 110 may even have a small distance to the drill collar 168, without disadvantageously reducing the holding effect of the magnetic force.
  • bit holder top 134 may be the bit holder top 134 or the bit holder 132, or both elements of the bit holder 130, or portions thereof, such as the contact portion 137 of the bit holder top 134.
  • bit 160 it is also possible not to provide the bit 160 in one piece, so that the bit head 164 can be removed from the drill collar 168.
  • a magnetic element 167 is then located e.g. on the chisel head 164 facing the end of the drill collar 168. Also shown is an arrow 300, which indicates the direction of the milling drum 200.
  • the chisel shaft 132 has a rectangular recess 133 into which a retaining screw 122 engages in the screwed-in state and thereby fixes the chisel holder 130, respectively its chisel holder shaft 132, in the recess 121 of the base part 120.
  • the retaining screw 122 cooperates with its external thread with an internal thread in the base part 120.
  • FIG. 2 shows an alternative tool shank 168 ', in the lateral surface of which a multiplicity of grooves 169 are arranged distributed equidistantly in the circumferential direction and extending in the direction of the longitudinal axis of the chisel shank 168'.
  • the grooves 169 each have a cross section in the form of a pitch circle, resulting in comparatively sharp edges 169 ', which can prevent the manner of a scraper attachments on the wall of the receiving bore, since the bit rotates about its axis during operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Milling Processes (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP05020983A 2004-09-27 2005-09-27 Pics pour un dispositif de fraisage tenu magnétiquement Not-in-force EP1641002B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004046719A DE102004046719A1 (de) 2004-09-27 2004-09-27 Meißel einer Fräsvorrichtung

Publications (2)

Publication Number Publication Date
EP1641002A1 true EP1641002A1 (fr) 2006-03-29
EP1641002B1 EP1641002B1 (fr) 2008-07-09

Family

ID=35453483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05020983A Not-in-force EP1641002B1 (fr) 2004-09-27 2005-09-27 Pics pour un dispositif de fraisage tenu magnétiquement

Country Status (3)

Country Link
EP (1) EP1641002B1 (fr)
AT (1) ATE400880T1 (fr)
DE (2) DE102004046719A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010008050U1 (de) 2009-07-22 2010-10-14 Elfgen, Gerd Meißel einer Fräseinrichtung sowie Meißel-Meißelhalter-Kombination
DE102009027732A1 (de) 2009-07-15 2011-01-27 Gerd Elfgen Meißel einer Fräseinrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008010609A1 (de) 2008-02-22 2009-09-03 Gerd Elfgen Meißelhalter, Meißel-Meißelhalter-Anordnung sowie Spannhülse

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2754101A (en) * 1949-01-21 1956-07-10 Saskatchewan Potash Machine and method for mining underground deposits
US2810567A (en) * 1956-02-01 1957-10-22 Gen Electric Cutter tool assembly providing a floating fit between tool and holder
US3256043A (en) * 1961-08-25 1966-06-14 Cincinnati Mine Machinery Co Releasable engagement means for cutter bits
US3497846A (en) * 1967-12-27 1970-02-24 Us Navy Magnetic anchor for curved and irregular surfaces
US5605382A (en) * 1995-08-02 1997-02-25 Kennametal Inc. Cutting tool retention system
US5833017A (en) * 1996-10-10 1998-11-10 Kennametal Inc. Cutting bit assembly for impinging an earth strata

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2754101A (en) * 1949-01-21 1956-07-10 Saskatchewan Potash Machine and method for mining underground deposits
US2810567A (en) * 1956-02-01 1957-10-22 Gen Electric Cutter tool assembly providing a floating fit between tool and holder
US3256043A (en) * 1961-08-25 1966-06-14 Cincinnati Mine Machinery Co Releasable engagement means for cutter bits
US3497846A (en) * 1967-12-27 1970-02-24 Us Navy Magnetic anchor for curved and irregular surfaces
US5605382A (en) * 1995-08-02 1997-02-25 Kennametal Inc. Cutting tool retention system
US5833017A (en) * 1996-10-10 1998-11-10 Kennametal Inc. Cutting bit assembly for impinging an earth strata

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009027732A1 (de) 2009-07-15 2011-01-27 Gerd Elfgen Meißel einer Fräseinrichtung
DE102009027732B4 (de) * 2009-07-15 2012-02-23 Gerd Elfgen Meißel einer Fräseinrichtung
DE202010008050U1 (de) 2009-07-22 2010-10-14 Elfgen, Gerd Meißel einer Fräseinrichtung sowie Meißel-Meißelhalter-Kombination

Also Published As

Publication number Publication date
EP1641002B1 (fr) 2008-07-09
ATE400880T1 (de) 2008-07-15
DE502005004610D1 (de) 2008-08-21
DE102004046719A1 (de) 2006-04-06

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