EP1631733B1 - Element de retenue de burin a tige cylindrique pour une fraiseuse - Google Patents

Element de retenue de burin a tige cylindrique pour une fraiseuse Download PDF

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Publication number
EP1631733B1
EP1631733B1 EP04735723A EP04735723A EP1631733B1 EP 1631733 B1 EP1631733 B1 EP 1631733B1 EP 04735723 A EP04735723 A EP 04735723A EP 04735723 A EP04735723 A EP 04735723A EP 1631733 B1 EP1631733 B1 EP 1631733B1
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EP
European Patent Office
Prior art keywords
bit
chisel
shank
round shank
round
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
EP04735723A
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German (de)
English (en)
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EP1631733A1 (fr
Inventor
Gerd Elfgen
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Individual
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Individual
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Publication of EP1631733A1 publication Critical patent/EP1631733A1/fr
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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
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements
    • 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
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186—Tools therefor, e.g. having exchangeable cutter bits
    • B28D1/188—Tools therefor, e.g. having exchangeable cutter bits with exchangeable cutter bits or cutter segments

Definitions

  • the invention relates to a round shank bit of a milling device having a plurality of round shank chisels, each mounted rotatably about a chisel axis and along the chisel axis a chisel head, a chisel shank and at least one holding element, wherein the chisel shanks each along its chisel axis in a bore in the cutter mounted chisel holders are inserted such that the chisel heads rest with a respective radially projecting collar on the chisel holders, wherein the holding elements arranged on a lateral surface of the chisel shafts and the round shank chisel by means of the holding elements in the holes are halterbar, and wherein means of the milling device a surface a material in a direction parallel to the surface extending milling direction can be milled so that the bit heads in the cutting direction next to and behind the other engage in the material.
  • Such milling devices are used for the removal of materials into which a chisel head can penetrate at least at the beginning of the milling process.
  • the milling process can be described at this moment rather than cutting the material, only towards the end of the individual chip is separated by brittle fracture of the material.
  • Such materials include, for example, asphalt-based road surfaces or concrete surfaces removed during maintenance or repair work, but also natural rocks, soils and coal mined in mining.
  • viscoelastic Compared to purely brittle material such materials are referred to as "viscoelastic" because they show both elastic damping properties and absorption behavior. In contrast to the ideal elasticity, a viscoelastic material reacts with a time delay to a load and only reaches a new equilibrium state after a more or less long time. Most plastics also have viscoelastic properties.
  • the known milling devices usually have a rotatable roller, on the lateral surface of the round shank bits are mounted.
  • the bit axles are inclined in this case from the radial direction substantially in the direction of rotation.
  • the rotating roller is perpendicular to its axis of rotation substantially along a material surface method, wherein the rotational direction of the roll rotation of a rolling on the surface roller is opposite.
  • the chisel heads engage by the amount of the layer thickness below the material surface in the material to be removed.
  • the engagement begins at a time when the individual bit head is substantially perpendicular to the surface of the roller relative to the surface.
  • the rotation of the roller and this travel speed of the milling device add up to a feed of the chisel head initially substantially parallel to the surface in the milling direction.
  • the chisel heads of such milling devices are subject to high wear due to the dynamic load during the milling process and must be renewed regularly.
  • Round shank bits have a chisel shank, which can be inserted into a bore of a chisel holder.
  • the chisel head with a carbide tip protrudes out of the hole and abuts the chisel holder with a collar projecting radially out of the chisel axis.
  • On the cylindrical lateral surface of the chisel shaft such a round shank chisel on a holding element, with which the round shank bit in the bore is halterbar.
  • the DE 36 30 444 A1 discloses a round shank bit having an elastomeric member between the collar on the bit head and the corresponding abutment surface on the bit holder to reduce material stress at that location.
  • a retaining ring (a so-called “snap ring”) is proposed at the free end of the chisel shank, which supports the round shank chisel in the axial direction on a corresponding contact surface on the chisel holder.
  • the DE 37 01 905 C1 discloses another round shank chisel, which has a steel clamping sleeve as a holding element, which encloses the chisel shank.
  • the clamping sleeve is pressed radially together by a ring as an assembly aid.
  • the clamping sleeve is relaxed, applies to the inner surface of the bore and fixed the chisel shank against displacement in the direction of the chisel axis.
  • the WO 95/27840 A discloses a round shank bit whose shank has at its rear end a groove into which in turn a holding element is inserted.
  • the groove has a rectangular shape in cross section.
  • the known round shank chisel have in principle in the mounted state both in the radial and in the axial direction with respect to the chisel axis at least a slight game.
  • This game is at the round shank chisel after the DE 37 01 905 C1 reinforced with the additionally circumferential around the gap between the clamping sleeve and drill collar. Due to this game, the bit shank of the round shank chisel in operation in the bore of the chisel holder and is supported in the end only at two defined points - on the collar of the bit head and at the end of the chisel shaft - on the bit holder.
  • the invention has for its object to provide a holding element that minimizes the game between pick and chisel holder and indirectly the wear on the bit holder while allowing easy assembly and disassembly of the round shank chisel.
  • An inventive round shank chisel is preferably designed such that the chisel shank thickened conically to its end facing away from the chisel head.
  • a conical bearing surface for the retaining element is provided, which in the case of an axial displacement of the round shank chisel in the chisel holder a radial expansion, i. Normal force, and therefore causes an axial frictional force on the adjacent holding element.
  • this is an inventive retaining element made of an elastomer, the holding element is radially expanded.
  • the retaining element is reinforcedly supported on the corresponding surface of the bore, which in turn improves the holding action of the retaining element.
  • the cone angle ⁇ is preferably between 10 ° and 30 °.
  • a chisel holder for the round shank chisel according to the invention preferably has in the region of the holding element a purely cylindrical bore, which can be manufactured very simply accurately and inexpensively.
  • the need to provide any grooves or recesses in the holder bore eliminated due to the frictional adhesion principle between the outer surface of the preferably slightly biased holding member and the lateral surface of the holder bore.
  • no passport problems In a wear of the stop collar of the round shank chisel or the corresponding stop surface of the chisel holder arise due to the mere cylindrical shape of the holder bore no passport problems.
  • the round shank chisel 1 shown in FIG. 1 has a chisel head 3 and a chisel shank 4 along a chisel axis 2.
  • the chisel head 3 has a radially projecting collar 5 and a soldered concave carbide tip 6.
  • the round shank chisel 1 is thus extended over the usual length in this size by about 20% to 30%.
  • the drill collar 4 has a diameter 10 and the collar 5 has a diameter 11.
  • FIG. 1 shows a manually pre-assembled state.
  • the drill collar 4 is partially inserted in a through hole 12 of a merely indicated chisel holder 13 in the direction of the chisel axis 2.
  • the bore 12 of the bit holder 13 has a diameter 14 of about 20 to 80 mm and a length 15 of about 40 to 200 mm. In the assembled state of the drill collar 4 is thus with a slight radial clearance in the bore 12th
  • the assembly is carried out starting from the preassembled state by the round shank chisel 1 is driven by impacts with a copper hammer, not shown, on the hard metal tip 6 in the direction of the chisel axis 2 in the bore 12.
  • the collar 5 of the round shank chisel 1 rests against the chisel holder 13 on a contact surface 16 formed perpendicular to the chisel axis 2.
  • a plurality of bit holders 13 with round shank bits 1 is mounted on a rotatable milling drum of a milling device.
  • the milling device is designed for milling a surface of a concrete structure or of road surfaces in a milling direction running parallel to the surface.
  • the chisel axis 2 of the round shank chisel 1 is inclined with respect to a radial direction of the milling drum in the direction of rotation thereof.
  • the milling drum and its radial and rotational directions, the milling device and the concrete structure or the road surface and the milling direction are not shown.
  • the chisel heads engage in the direction of milling next to and behind each other in the concrete or asphalt and carry its surface in the typical for this process "comma chips" from.
  • a - shown in Figure 2 individually illustrated holding member 18 made of a glass fiber reinforced polyurethane rubber.
  • the holding element 18 is tubular in the direction of the chisel axis 2 and has a length 19 of approximately 5 to 50 mm.
  • the drill collar 4 is reduced in a polished contact surface 22 for the holding element 18 over a length 23 to a diameter 24. At its end facing away from the bit head 3 25, the contact surface 22 is conically thickened.
  • the drill collar 4 has at its free end 8 a radially projecting collar 26 (with the diameter 10 of the drill collar 4).
  • the holding element 18 has a parting line 27 extending in the direction of the chisel axis 2. After widening of this parting line 27 in the circumferential direction 28 of the retaining element 18 of the chisel shank 4 of the round shank chisel 1 in the groove 29 in the retaining element 18 can be clipped. In mounted on the drill collar 4 state, the holding member 18 relative to the bore 12 so that a slight radial excess.
  • the holding element 18 For mounting the provided with the holding element 18 round shank chisel 1 this is driven by hand or with the copper hammer to the system of the Federal 5 on the contact surface 16 in the bore 12 of the chisel holder 13. Due to the slight excess, the holding element 18 is radially compressed during assembly and thus clamped between the contact surface 22 on the chisel shank 4 and the bore 12.
  • the radial tolerances of the contact surface 22, the bore 12 and the retaining element 18 are dimensioned such that the rotation of the round shank chisel 1 around the chisel axis 2 during the milling process is not hindered.
  • a sudden relaxation of the round shank chisel 1 from a load in the direction of the chisel axis 2 causes - as described above - an acceleration of the round shank chisel 1 in the direction of the chisel axis 2 out of the bore 12 due to the elastic properties of the chisel holder 13 and the round shank chisel 1. Due to the displacement of the chisel shank 4 in the holding element 18, the conically thickened end 25 of the abutment surface 22 initially engages the holding element 18 and reinforces its clamping against the bore 12.
  • the collar 26 engages the retaining element 18 at the end 8 of the chisel shank 4.
  • the holding element 18 is compressed in the direction of the chisel axis 2 and at the same time radially expanded.
  • the tension in the bore 12 of the bit holder 13 is reinforced again and prevents the axial displacement of the round shank chisel 1 in the bit holder 13.
  • the round shank bit 30 according to the invention shown in FIG. 3 differs from the round shank bit 1 according to FIG. 1 only by the missing collar at the free end 31 of the drill shank 32.
  • the length 33 of the drill shank 32 is approximately 1.5 times the length of the bit head (without tip ).
  • the round shank bit 30 is advantageously used in operating cases, when the radial loads are expected to be rather low during operation.
  • the round shank bit 34 according to the invention shown in FIG. 4 has two holding elements 35, 36.
  • the length 37 and the diameter 38 of the chisel shank 39 correspond to the round shank bit 30 according to FIG. 3.
  • a contact surface 41 with a diameter 42 and a length 43 is formed on the surface 40 of the chisel shank 39.
  • the drill collar 39 has a collar 45.
  • the first holding element 35 is a metallic clamping sleeve 46 with retaining ring 47, as is known from the prior art.
  • the clamping sleeve 46 has an unrestrained diameter, which is greater than the diameter of the bore in the bit holder.
  • a commercial O-ring is inserted in the contact surface 41 of the round shank chisel 34 adjacent to the collar 45.
  • the holding element 36 runs on the conically thickened end 48 of the contact surface 41 and is clamped between this and the bore 12.
  • the conical surface causes the implementation of an axially forward movement of the round shank chisel 34 in a radial elastic expansion of the holding member 36, whereby the axial displacement is effectively prevented.
  • the round shank bit 34 has a significantly reduced tendency to tilt in the bore 12 of the bit holder 13, not shown here, and a significantly lower wear in the contact surfaces.
  • Fig. 5 shows a detail of a further round shank chisel 51, which is mounted in the bore 12 of the chisel holder 13.
  • the sleeve-shaped holding member 55 made of a rubber-elastic material has on its outer circumferential surface a circumferentially extending toothing 52, which is shown enlarged for the sake of clarity.
  • the toothing 52 engages in a corresponding toothing in the inner circumferential surface 53 of the chisel holder 13 a.
  • the holding member 55 may be annular closed or - for ease of installation half - be provided with a slot extending in the axial direction. Furthermore, it is possible that the end of the holding element 55 facing away from the chisel head likewise has a conical shape in the area of the inner circumferential surface and, to this extent, can be adapted to the conical surface 42 of the round shank chisel 51.
  • the round shank chisel 50 shown in FIG. 6 has a collar 51 whose diameter is increased to approximately 50 mm in order to enable simple hand assembly.
  • the chisel shaft 52 has a groove 53 in the direction of the chisel axis 2 only a small length for receiving a dashed line indicated O-ring, which is slotted obliquely, as a holding element 54.
  • the diameter of the O-ring in the state in which this on the drill collar 52 is about 4% larger than the inner diameter of the bore of the bit holder, not shown, into which the round shank bit 50 can be inserted.
  • the chisel shaft 52 has in the region of the groove 53 a conical rear portion 55, the cone angle ⁇ is approximately 20 ° and therefore causes a spreading of the support member 54 and thus a secure fixation of the round shank chisel 50 in the chisel holder.

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  • 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)

Claims (6)

  1. Burin à tige ronde (1, 30, 34, 50) pour un dispositif de fraisage, qui présente plusieurs burins à tige ronde (1, 30, 34, 50), qui sont montés chacun en rotation autour d'un axe de frappe (2) et qui présentent le long dudit axe de frappe (2) une tête de burin (3), une tige de burin (4, 32, 39, 52) et au moins un élément de maintien (18, 35, 36, 54) en un élastomère, lesdites tiges de burin (4, 32, 39, 52) pouvant chacune être insérées, le long de leur axe de frappe (2), dans un trou (12) des porte-burins (13) montés sur le dispositif de fraisage de telle manière que lesdites têtes de burin (3) butent aux dits porte-burins (13) par une collerette (5) saillant à chaque fois de manière radiale, lesdits éléments de maintien (18, 35, 36, 54) étant disposés sur une surface externe (17, 40) des dites tiges de burin (4, 32, 39, 52) et lesdits burins à tige ronde (1, 30, 34, 50) pouvant être maintenus dans les trous (12) au moyen desdits éléments de maintien (18, 35, 36, 54) et la surface d'un matériau pouvant être fraisée au moyen du dispositif de fraisage dans une direction de fraisage parallèle à la surface de telle manière que lesdites têtes de burin pénètrent dans le matériau dans la direction de fraisage l'une derrière l'autre et l'une à côté de l'autre, caractérisé en ceci qu'une surface d'applique (22, 41) dans laquelle ledit élément de maintien (18, 36, 54) s'applique à la surface externe (17, 40) de ladite tige de burin (4, 32, 39, 52), présente un renflement conique à son extrémité (25) opposée à ladite tête de burin (3).
  2. Burin à tige ronde (34) selon la revendication précédente, caractérisé par plusieurs éléments de maintien (18, 35, 36, 54).
  3. Burin à tige ronde (34) selon la revendication précédente, caractérisé en ceci qu'un élément de maintien (35) est un manchon de serrage (46) métallique.
  4. Burin à tige ronde (1, 34, 50) selon une des revendications 1 à 3, caractérisé en ceci que ladite tige de burin (4, 39, 52) présente à son extrémité libre (8, 44) opposée à ladite tête de burin (3) une collerette (26, 45) saillant de manière radiale.
  5. Burin à tige ronde (1, 34, 50) selon une des revendications précédentes, caractérisé en ceci que ladite collerette (26, 45) présente à l'extrémité libre (8, 44) ladite tige de burin (4, 39) un diamètre (10, 38) plus grand qui correspond presqu'à un diamètre (14) le plus faible d'un trou (12) d'un porte-burin (13).
  6. Burin à tige ronde (1, 34, 50) selon la revendication 1, caractérisé en ceci que l'angle du cône α se situe entre 10° et 30°.
EP04735723A 2003-06-03 2004-06-02 Element de retenue de burin a tige cylindrique pour une fraiseuse Expired - Lifetime EP1631733B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003125253 DE10325253A1 (de) 2003-06-03 2003-06-03 Halteelement für einen Schaftmeißel einer Fräsvorrichtung
PCT/DE2004/001131 WO2004109059A1 (fr) 2003-06-03 2004-06-02 Element de retenue de burin a tige cylindrique pour une fraiseuse

Publications (2)

Publication Number Publication Date
EP1631733A1 EP1631733A1 (fr) 2006-03-08
EP1631733B1 true EP1631733B1 (fr) 2007-11-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04735723A Expired - Lifetime EP1631733B1 (fr) 2003-06-03 2004-06-02 Element de retenue de burin a tige cylindrique pour une fraiseuse

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EP (1) EP1631733B1 (fr)
DE (2) DE10325253A1 (fr)
WO (1) WO2004109059A1 (fr)

Families Citing this family (7)

* 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
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
DE102011054384A1 (de) 2011-10-11 2013-04-11 Betek Gmbh & Co. Kg Meißelhalter
EP2766571A2 (fr) 2011-10-11 2014-08-20 Betek GmbH & Co. KG Burin à tige et support
DE102011054393A1 (de) 2011-10-11 2013-04-11 Betek Gmbh & Co. Kg Schaftmeißel
CN110027121B (zh) * 2019-05-07 2021-05-14 黄冈师范学院 一种用于室内墙面开管件槽的切槽设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3318401A (en) * 1964-02-04 1967-05-09 Tel E Lect Products Inc Auger head
US4743069A (en) * 1985-03-19 1988-05-10 Gte Products Corporation Rotatable cutting bit
DE3630444A1 (de) * 1986-09-06 1988-03-10 Worley & Partner Gmbh Abtragvorrichtung fuer schneidenden materialabtrag
DE3701905C1 (de) * 1987-01-23 1988-09-15 Betek Bergbau & Hartmetall Befestigung eines Rundschaftmeissels
US4844550A (en) * 1987-07-21 1989-07-04 Beebe Donald E Wear protector for tooth brackets on roadway surface cutting machines
DE9213528U1 (de) * 1992-10-07 1993-01-07 Maloe predprijatie "Pigma", Moskau/Moskva Gewinnungsvorrichtung einer Bergbaumaschine
AUPM494494A0 (en) * 1994-04-08 1994-05-05 Cutincoal Pty Limited Integrated drilling and rock bolting apparatus
US5536073A (en) * 1995-05-08 1996-07-16 Kennametal Inc. Road milling drum assembly and method of milling

Also Published As

Publication number Publication date
DE502004005566D1 (de) 2008-01-03
WO2004109059A1 (fr) 2004-12-16
DE10325253A1 (de) 2004-12-23
EP1631733A1 (fr) 2006-03-08

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