EP0070506A2 - Bras de havage d'une haveuse - Google Patents

Bras de havage d'une haveuse Download PDF

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Publication number
EP0070506A2
EP0070506A2 EP82106284A EP82106284A EP0070506A2 EP 0070506 A2 EP0070506 A2 EP 0070506A2 EP 82106284 A EP82106284 A EP 82106284A EP 82106284 A EP82106284 A EP 82106284A EP 0070506 A2 EP0070506 A2 EP 0070506A2
Authority
EP
European Patent Office
Prior art keywords
belt
cutting
drive wheel
wedge surfaces
arm according
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.)
Withdrawn
Application number
EP82106284A
Other languages
German (de)
English (en)
Other versions
EP0070506A3 (fr
Inventor
Johann Mylewski
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.)
Maschinenfabrik Korfmann GmbH
Original Assignee
Maschinenfabrik Korfmann 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 Maschinenfabrik Korfmann GmbH filed Critical Maschinenfabrik Korfmann GmbH
Publication of EP0070506A2 publication Critical patent/EP0070506A2/fr
Publication of EP0070506A3 publication Critical patent/EP0070506A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
    • E21C25/22—Machines slitting solely by one or more cutter chains moving unidirectionally along jibs
    • E21C25/28—Chains or chain guides
    • 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
    • B28D1/12—Saw-blades or saw-discs specially adapted for working stone
    • B28D1/124—Saw chains; rod-like saw blades; saw cables
    • B28D1/125—Saw chains; rod-like saw blades; saw cables with exchangeable cutter bits or cutter segments

Definitions

  • the invention relates to a cutting arm on a cutting machine, with a rotating cutting body which is provided with cutting tools made of hard metal or set diamond chips, with a drive wheel for the rotation of the cutting body and with a guide of the cutting body along the cutting arm.
  • the cutting body consists of a steel chain, the webs of which are carried along by the teeth of a motor-driven drive wheel designed as a gear, whereby the chain rotates around the periphery of the cutter arm.
  • Such cutting arms are part of a cutting machine that is used, for example, for cutting stones.
  • considerable wear occurs on the cutting tools of the chain as well as on the chain itself in the area of the guides, so that in unfavorable cases after a few hours of operation the cutting chain against an un worn out must be replaced.
  • the guide After renewing the chain several times, the guide must also be renewed, which is associated with considerable costs and effort.
  • the invention proposes that the cutting body is designed as a flexible belt with attached cutting bits, that the drive wheel and the belt are each provided with opposing wedge surfaces, and that the belt touches the guide outside the wedge surfaces.
  • the invention therefore provides for a type of V-belt pulley to be used as the driving wheel and for the cutting body to be designed as a flexible belt with wedge surfaces.
  • a type of V-belt pulley to be used as the driving wheel and for the cutting body to be designed as a flexible belt with wedge surfaces.
  • the flexible belt is generally less expensive to produce than a comparable steel chain. This applies both to a composite belt and to a pure V-belt, which is covered with cutting chisels on the top.
  • a composite belt is to be understood, for example, as a flat belt which is provided on its underside with guide pieces or bumps which have the actual wedge surfaces; The cutting chisels are attached to the top in the usual way.
  • the drive wheel is formed in two parts, that each part carries one of the wedge surfaces, and that an adjustment of the wedge surface distance is provided.
  • the two parts of the drive wheel are brought closer to one another, as a result of which the wedge surfaces also move closer together. This results in a tension of the belt, since the corresponding running diameter of the belt is larger in the area of the drive wheel or the respective wedge surfaces of the belt and the drive wheel are pressed closer together.
  • the guide for the cutter arms consists of an open U-profile, which is also retained in the cutter arm according to the invention.
  • the narrow side of the belt slides over the base of the U-profile, while the lateral guidance between the wedge surfaces of the belt and the cutting tools takes place on a specially created or already existing guide surface.
  • the cutter chisel can no longer be soldered or welded, but only an attachment by gluing, screwing or riveting, which can be supported by a positive fit between the cutting chisel and the belt.
  • the design of the cutting chisel as a cap is very advantageous if the cavity inside the cap is filled by a cusp of the top of the belt which is adapted in shape in each case. In this way, very firm connections can be created, which can also cope with the hardest rock.
  • the invention comprises a second way of achieving this object, which is characterized in that the cutting body is designed as a flexible belt with attached cutting bits, that the drive wheel has a cylindrical peripheral surface which is provided with pockets at regular intervals and that there are projections on the underside of the belt for engagement with the pockets.
  • a toothed belt can also be provided, in which case the drive wheel is designed accordingly.
  • the gearwheel there is a positive connection between the gearwheel and the belt provided on its underside with projections that is comparable to that of a chain, but there are considerable differences from a cut chain.
  • a chamfer chain Due to its stable construction, a chamfer chain can only be stretched very little in the longitudinal direction. This leads to the fact that a pretension imparted to the cutting chain is lost after a very slight wear and the chain only loosely runs around the cutting arm.
  • a toothed belt has completely different conditions in this regard. Compared to a chamfer chain, this is almost extremely stretchy, although it may have steel wire inserts. This extensibility may have contributed to the fact that toothed belts have not been used as cutting bodies for cutter arms.
  • the comparatively strong elasticity of the toothed belt makes it run more smoothly, and the tension imparted to it lasts longer, since wear does not immediately lead to elongation and a certain amount of elongation is absorbed by the tension, but there are difficulties with it Engagement of the toothed belt with the toothed wheel when this is given a more or less strong pretension.
  • the distance between the pockets on the drive wheel corresponds to the distance between the projections on the belt in its pretensioned state.
  • the division on the drive wheel is chosen from the outset at greater intervals than the actual distances of the projections on the belt in its untensioned state.
  • timing belt has become so long in the course of operation that the pitch of the toothed belt harmonizes with the pitch of the toothed wheel in the tensioned state, there are certain pitch errors when re-tensioning, but it must be taken into account that the timing belt then generally should already be in a rather worn condition and therefore further damage due to the tooth division is less important; such a toothed belt must be replaced anyway for regular operation.
  • the toothed belt is provided with wedge surfaces in the lower region of the projections, so that it can also be used for a drive wheel with wedge surfaces.
  • the projections can thus be made as an integral part of the belt, but they can also be glued, screwed or riveted to the underside of the belt as guide pieces. The same applies to the attachment of the cutting tool on the top of the belt or for the combined attachment of a guide piece and a cutting tool.
  • Fig. 1 the drive of the cutting arm according to the invention is illustrated in a sectional view, that is, the power transmission from a drive wheel 2 to a flexible belt 1 serving as a cutting body, which is equipped with cutting bits 3.
  • the drive wheel 2 consists of two parts 4, which are each designed as halves and which carry two opposing wedge surfaces 5 on their outer edge. Wedge surfaces 6 (FIG. 2) are also arranged on the belt 1 and cooperate with the wedge surfaces 5 of the drive wheel 2.
  • a guide 7 is provided for checking the belt 1, which is designed in cross section as a U-profile open to the outside.
  • the U-profile is created by a corresponding design of a track 8, which the longitudinal end of the cutter arm is attached.
  • the guide 7 is designed so that the belt 1 is guided only outside the wedge surfaces 6.
  • the wedge surfaces 6 are guided on guide surfaces 31 aligned parallel to one another and in the area of the base of the U-profile on a flat surface between the wedge surfaces 6. In this way, there can be no jamming on the wedge surfaces 6 along the guide 7 if the belt 1 is pressed into the guide 7 due to the cutting pressure.
  • the two parts 4 of the drive wheel 2 are continuously adjustable with respect to one another, as a result of which the distance between the two wedge surfaces 5 is also reduced.
  • the adjustment can be made in different ways.
  • the two parts 4 are displaceable against one another with the aid of a multi-tooth profile 10, with a preload being applied in the direction of a small distance between the wedge surfaces 5 with the aid of disc springs 11.
  • the bias of the plate springs 11 depends on the position of a lockable nut 12, which can be adjusted to different degrees in the direction of the multi-tooth profile 10.
  • This arrangement keeps the wedge surfaces 6 of the drive wheel 2 in constant pretension contact with the wedge surfaces 6 of the belt 1, so that the belt is automatically retensioned when the belt 1 is stretched slightly or the wedge surfaces 6 are slightly worn.
  • the belt can extend so far into the wedge gap of the connector drive wheel 2 are drawn in that it expands the two parts 4, so that in the incoming part of the drive wheel 2 the contact between the drive wheel 2 and the belt 1 breaks off.
  • an arrangement is therefore preferable in which the maximum distance between the two parts 4 from one another and thus the distance between the wedge surfaces 5 is fixed (not shown), this spreading position being maintained with the aid of disc springs.
  • each part 4 is formed in several parts, so that the wedge surfaces 5 and the multi-tooth profile 10 are arranged on different components.
  • This has the advantage that, for example, if the wedge surfaces 5 wear, only the corresponding rings have to be replaced and not a complete half of a drive wheel 2.
  • the detailed design of the drive wheel is of no importance for the invention.
  • outlet openings 18 are provided in the area of the base of the U-profile and are connected via a bore 17 to an underlying water channel 16 (FIG. 2).
  • the water channel 16 is created by the inclusion of the roller bar 8 in the cutter arm, which is further excluded at this point than required to accommodate the roller bar 8.
  • the bolts 19 required to secure the track 8 on the cutter arm are each arranged outside the bores 17. The bolts 19 also contribute to a good seal of the water channel 16.
  • the one emerging from the outlet opening 18 Water, to which lubricant can also be added, also reaches the interface via the guide 7 in order to cool the cutting bits 3.
  • Humps 24 and 25 are formed on the underside and top of the belt 1 at the same locations, which can form an integral part with the belt 1 or e.g. are glued on. While the upper humps 25 are provided with essentially vertical side walls, the side walls of the lower humps 24 are chamfered to wedge surfaces 6, so that the actual belt is rectangular in cross section. This belt shape is also shown in Figures 1 and 2.
  • the cutting bits 3 are cap-shaped in this embodiment and consist e.g. from investment casting. On the side facing the stone to be cut, each cutting bit 3 is covered with a diamond badge 27 which e.g. is soldered on. Notwithstanding this, cutting tools made of hard metal can also be used at this point.
  • the cap-shaped cutting bits 3 are fastened by means of rivets 26 to the upper bumps 25, which are drilled out and replaced for an exchange of the cutting bits 3. 1 and 2 that the cutting bits 3 also overlap the respective cusps 25 laterally.
  • the embodiment of the belt 1 according to the invention shown in FIG. 3 is particularly well suited for pairing with a drive wheel which is suitable for the drive a toothed belt is designed accordingly.
  • the drive wheel 2 is then provided with a cylindrical circumferential surface, in which pockets are let in at a uniform spacing around the circumference (not shown).
  • the invention follows known routes, so that an illustration can be dispensed with.
  • the pockets are shaped in such a way that the humps 24 abut the corresponding pockets of the drive wheel 2 on all sides and form a positive connection with the latter.
  • the areas of the belt 1 remaining between two adjacent bumps 24 then rest on the remaining areas of the cylindrical peripheral surface.
  • the wedge surfaces 6 formed on the cusps 24 do not interfere, but they are not necessary for operation as a toothed belt, in other words, in this case the cusps can be provided with side walls that are parallel to one another.
  • the flat belt consists of a flat belt, to which cutting bits 3 are screwed on the top and guide pieces 2 9 on the bottom.
  • the flat belt is made of plastic with a fabric insert, which can also include steel threads or steel wires.
  • the flat belt is provided with holes through which screws 30 protrude. They connect the cutting bit 3 to the guide piece 29, projecting cams or ribs being attached to the underside of the cutting bit 3 to improve the positional stability of the cutting bit relative to the flat belt and penetrating into the surface of the flat belt.
  • Each guide piece 29 has the wedge surfaces 6 in the lower area, while guide areas 31 are formed in an area above it up to the underside of the flat belt. Their distance is chosen (Fig. 5) so that the guide surfaces 31 opposite the guide of the cutting arm protrude the furthest so that the flat belt 1 itself does not perform any management tasks. In this way, maximum protection of the belt is possible, in the case of advanced wear, the guide pieces 6 and the cutting tools 3 are exchanged and the belt itself is retained.
  • This type of belt is also suitable for operation in conjunction with a drive wheel which is designed as a toothed belt drive wheel.
  • the wedge surfaces 6 do not interfere, but they are also not required. As far as the guidance is concerned, the procedure is as described, only the power transmission between the drive wheel 2 and the belt 1 is designed differently.
  • the choice of belt depends on the respective place of use. It can be seen that the belt provided with bumps 24 and 25 according to the embodiment of FIG. 3 can be relatively easily re-equipped or re-equipped. For this purpose, only the cap-shaped cutting chisels 3 have to be put on and the rivets 26 inserted, for example with the aid of a device. When replacing a belt, the old rivets 26 are either drilled out on one side or pressed out of the fastening holes with the aid of a stamp and new rivets 26 are inserted. This process can optionally be mechanized, so that the assembly can be carried out in a relatively short time. However, the cap-shaped cutting bits 3 are relatively expensive. In contrast, in the embodiment according to FIGS.
  • the belt can be manufactured extremely inexpensively, and the guide pieces 29 as well as the cutting chisels 3 consisting more or less of a plate can be produced very inexpensively.
  • assembly is more complex, and difficulties are particularly to be expected when re-fitting a belt. Namely, it must be expected that some of the screws 30 are rusted or bent, so that their removal is difficult. It may therefore be more appropriate replacing the entire belt and not reusing it, which is particularly attractive because the manufacturing costs of the very simple flat belt are not very high.
  • the most favorable constellation can be selected, with the choice of re-fitting or one-time use of a belt.
  • the invention makes use of previous practices.
  • the guidance in the area of the base of the U-profile is therefore carried out with the aid of a rotatably mounted roller, so that there is no sliding, but a contacting guidance in this area.
  • a type of V-belt or toothed belt pulley can also be present here, which rotates at the speed of the belt.

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)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Knives (AREA)
  • Sawing (AREA)
EP82106284A 1981-07-17 1982-07-14 Bras de havage d'une haveuse Withdrawn EP0070506A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3128264 1981-07-17
DE19813128264 DE3128264A1 (de) 1981-07-17 1981-07-17 Schraemarm an einer schraemmaschine

Publications (2)

Publication Number Publication Date
EP0070506A2 true EP0070506A2 (fr) 1983-01-26
EP0070506A3 EP0070506A3 (fr) 1985-10-30

Family

ID=6137124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106284A Withdrawn EP0070506A3 (fr) 1981-07-17 1982-07-14 Bras de havage d'une haveuse

Country Status (2)

Country Link
EP (1) EP0070506A3 (fr)
DE (1) DE3128264A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4603678A (en) * 1984-10-05 1986-08-05 W. F. Meyers Company, Inc. Belt-configured saw for cutting slots into stone
US4679541A (en) * 1984-10-05 1987-07-14 W. F. Meyers Company, Inc. Belt-configured saw for cutting slots into stone
EP0284593A1 (fr) * 1987-03-23 1988-09-28 DIAMANT BOART Société Anonyme Bras haveur
EP0358112A1 (fr) * 1988-09-03 1990-03-14 Maschinenfabrik Korfmann GmbH Bras haveur pour machines à haver destinées à couper des pierres, du béton, etc.
DE9110796U1 (de) * 1991-07-16 1991-11-14 Maschinenfabrik Korfmann Gmbh, 5810 Witten Schrämarm für Schrämmaschinen zum Schneiden von Hartgestein

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9108725U1 (de) * 1991-07-16 1992-11-19 Maschinenfabrik Korfmann Gmbh, 5810 Witten Schrämarm für Schrämmaschinen zum Schneiden von Naturstein, Beton o.dgl.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2368092A (en) * 1943-12-30 1945-01-30 Contour Saws Saw band for hard refractory materials
FR60383E (fr) * 1950-06-10 1954-11-02 Scie à lame sans fin
GB725721A (en) * 1952-03-27 1955-03-09 Sonapar Soc De Participation Endless saw for cutting stone and like hard material
FR1113453A (fr) * 1954-11-02 1956-03-29 Courroie-meule et son procédé d'utilisation
EP0014776A1 (fr) * 1979-02-22 1980-09-03 Honoré Joseph Lambot Bras haveur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2368092A (en) * 1943-12-30 1945-01-30 Contour Saws Saw band for hard refractory materials
FR60383E (fr) * 1950-06-10 1954-11-02 Scie à lame sans fin
GB725721A (en) * 1952-03-27 1955-03-09 Sonapar Soc De Participation Endless saw for cutting stone and like hard material
FR1113453A (fr) * 1954-11-02 1956-03-29 Courroie-meule et son procédé d'utilisation
EP0014776A1 (fr) * 1979-02-22 1980-09-03 Honoré Joseph Lambot Bras haveur

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4603678A (en) * 1984-10-05 1986-08-05 W. F. Meyers Company, Inc. Belt-configured saw for cutting slots into stone
US4679541A (en) * 1984-10-05 1987-07-14 W. F. Meyers Company, Inc. Belt-configured saw for cutting slots into stone
EP0284593A1 (fr) * 1987-03-23 1988-09-28 DIAMANT BOART Société Anonyme Bras haveur
BE1000418A4 (fr) * 1987-03-23 1988-12-06 Diamant Boart Sa Bras haveur.
EP0358112A1 (fr) * 1988-09-03 1990-03-14 Maschinenfabrik Korfmann GmbH Bras haveur pour machines à haver destinées à couper des pierres, du béton, etc.
DE9110796U1 (de) * 1991-07-16 1991-11-14 Maschinenfabrik Korfmann Gmbh, 5810 Witten Schrämarm für Schrämmaschinen zum Schneiden von Hartgestein

Also Published As

Publication number Publication date
DE3128264A1 (de) 1983-02-03
EP0070506A3 (fr) 1985-10-30

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Inventor name: MYLEWSKI, JOHANN