EP1832386B1 - Grinding wheel for machining objects, in particular natural or artificial stones - Google Patents

Grinding wheel for machining objects, in particular natural or artificial stones Download PDF

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Publication number
EP1832386B1
EP1832386B1 EP07103859A EP07103859A EP1832386B1 EP 1832386 B1 EP1832386 B1 EP 1832386B1 EP 07103859 A EP07103859 A EP 07103859A EP 07103859 A EP07103859 A EP 07103859A EP 1832386 B1 EP1832386 B1 EP 1832386B1
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EP
European Patent Office
Prior art keywords
grinding
grinding wheel
wheel
pumping
wheel according
Prior art date
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EP07103859A
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German (de)
French (fr)
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EP1832386A1 (en
Inventor
Franz Steidle
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Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG
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Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with cooling provisions
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
    • B28D7/02—Accessories specially adapted for use with machines or devices of the preceding groups for removing or laying dust, e.g. by spraying liquids; for cooling work

Definitions

  • the invention relates to a grinding wheel according to the preamble of claim 1.
  • the stones may in particular be artificial stones, such as bricks, which, after their manufacture, are attached to their surface, e.g. may have ridges derived from cutting operations, which are the subsequent processing in the way and therefore to be machined.
  • the cutting wheel has a cutting means in its peripheral region, which has a working surface on a working side of a disk-shaped wheel body of the grinding wheel and is effective on this working side of the grinding wheel and accessible to the object to be machined.
  • the grinding wheel is rotated by a rotary drive, wherein the abrasive rotates in a ring zone.
  • this or these are moved on a conveyor track on the working side of the grinding wheel over so that they come into contact with the abrasive and machined.
  • This machining operation may be a grinding or milling operation.
  • grinding is used because this name is at least introduced in the brick industry.
  • a cutting wheel which represents a total of a top and bottom open frusto-conical structure whose inner circumferential surface is connected via six Verstrebungssegmente with a central hollow shaft, so that the Truncated cone - even after applying the hollow shaft to a vertical drive shaft - is open up and down.
  • the cutting parts or the polishing plates are mounted on the lower end face of the truncated cone, whereby the workpiece can be processed horizontally.
  • the Verstrebungssegmente In order to generate an air flow through the interior of the cutting wheel, so as to cool the workpiece during processing and to remove the cutting, milling or abrasion dust, the Verstrebungssegmente an equal inclination, resulting in a strong rotational movement of the cutting wheel to a ship screw-shaped suction or blowing of the workpiece with the ambient air leads.
  • a cutting device in which the cutting wheel is covered with a disc on the back and only between the disc edge and the abrasive segments has a gap (air gap).
  • the air gap can be supplied with a sufficient quantity of air which, on leaving the air gap, cools the abrasive segments and keeps them free from abrasion and grinding dust.
  • a grinding wheel which is designed as an impeller of a centrifugal pump in that a coolant is pressed circumferentially on the entire wheel width through a porous or cannulated grinding wheel.
  • the coolant is supplied, for example, the impeller by the shaft over which the impeller is pushed.
  • a grinding wheel for use in a grinding apparatus having dust removing drive vanes for reducing the distribution of dust in the air, and for increasing the cooling effect of the grinding wheel to improve the grinding ability and extend the life of the grinding wheel.
  • a cutting wheel of the type specified is in the DE 101 62 425 A1 described.
  • This prior art grinding wheel has a radially outwardly extending from a bearing assembly wheel body on the working side, a disc-shaped cover body with axial distance to the wheel body is mounted, wherein arranged between the wheel body and the cover body Conveying elements suck in air through a hollow shaft of the bearing assembly from the side facing away from the working side of the grinding wheel ago and promote outward to the abrasive out.
  • an air supply duct extends through a motor shaft designed as a hollow shaft. Due to the considerably long hollow shaft and due to a desired small construction not only a relatively small air supply cross section is available, but the air supply is relatively low due to the considerable length of the hollow shaft resulting line losses.
  • the invention has for its object to improve the air supply in a grinding wheel of the type specified. This object is solved by the features of claim 1. Advantageous developments of the invention are described in the subclaims.
  • the wheel body in its area surrounding the bearing assembly axial flow openings for the air, wherein the paddle-shaped conveying elements are arranged in the flow direction before or in the inflow openings.
  • the paddle-shaped conveying elements are arranged in the flow direction before or in the inflow openings.
  • a particularly powerful construction results from the fact that, according to the invention, the conveying elements protrude from the rear side of the wheel body.
  • the conveying elements cooperate directly with the air which is in the area surrounding the bearing arrangement and is in the standing state or in a low moving state than would be the case if the conveying elements were arranged in the rotating grinding wheel , as is the case in the prior art.
  • the paddle-shaped conveying elements through the flow openings preferably down to the front of the wheel body extend.
  • the conveying surface section of the conveying elements located in the axial extension region of the wheel body can also be utilized as an actively conveying section, and thus the blade surface can be axially enlarged.
  • Another advantage of the embodiment according to the invention is that large cross-sectional dimensions are available for the flow openings not only because of a selectable number but also because of the available radial area and therefore large axial flow cross sections are achievable, which enable or ensure efficient air supply ,
  • the inventive design leads to improved engine cooling, since the axially supplied air can coat the outer surface of the engine over a large area.
  • first conveying elements in addition to first conveying elements, second conveying elements can be provided which are offset radially outward with respect to the first conveying elements. It is also possible to provide only the second conveying elements instead of the first conveying elements, so that the latter can be omitted.
  • the promotion of air can be achieved by displacement effect or by suction.
  • the effectiveness is great when the dimension of the conveying elements, which extends essentially radially from the inside to the outside, is relatively large. It is particularly advantageous if the z. B. formed by lateral projections conveyor elements extending from the peripheral region of the inflow outward to the cutting means or to a slip ring carrying the cutting means, or extending into its area. Moreover, if the gaps formed between the approaches are axially closed on both sides, z. B. by a disc, arise between the wheel center and such a cover outwardly extending channels in which the air flow can form undisturbed and propagate.
  • the lateral approaches can z. B. be formed by rectangular in cross-section bars whose extending in the direction of rotation dimension is preferably the same.
  • the gaps or channels extending between the lugs have a width extending in the direction of rotation, which width increases continuously radially outward. This has an advantageous effect on the air flow in the delivery mode.
  • the z. B. by lateral projections formed conveying elements to the inner peripheral portion of the slip ring or, z. B. two-piece, also extend in the region of the slip ring, z. B. up to the arranged in its peripheral region grinding elements.
  • the improved air guide embodiments of the present invention are also advantageously suitable for mounting the grinding wheel in a housing that surrounds the grinding wheel with a conveying nip whose radial width increases in the direction of rotation, e.g. progressively increases and extends to an outlet opening in the housing.
  • the dust produced during operation can advantageously be removed and, for example, removed. collect in a collection facility.
  • the inventive design allows removal of the working dust or machining chips, without the need for a special suction device, which would have to be provided with an additional drive.
  • the embodiment according to the invention is used as a drive for the dust removal of the rotary drive for the cutting wheel.
  • the machining module denoted by 1 in its entirety, comprises a housing 2 with a mounting side 3 which is open on a preferably vertical front side and which has e.g. comprising a plurality of wall parts existing rear wall 2a and a laterally projecting from this peripheral wall 2b, which delimit a housing space 2c, in which a grinding wheel 4 is arranged.
  • the grinding wheel 4 has a disk-shaped wheel body 5 and a slip ring 6 fixed in its peripheral region, which carries a preferably annularly distributed on its peripheral region and secured thereto abrasive 7 and even in the peripheral region of the wheel body 5 is fixed thereto, for example by several distributed circumferentially arranged screws 8, the heads are preferably arranged sunk in the slip ring 6.
  • the wheel body 5 has an annular groove 11 which expires circumferentially and which extends toward a working side 9 of the grinding wheel 4, in which the slip ring 6 is fitted.
  • the abrasive 7 is arranged in the peripheral region of the slip ring 6, wherein it projects axially from the slip ring 6 on the working side, so that its approximately radially extending working surface 6a is axially offset from the slip ring body 6b.
  • the abrasive 7 may be e.g. formed by a plurality of circumferentially spaced and thus circumferentially directed spaced abrasive grits 7a fixed to the slip ring body 6b, e.g. by soldering or gluing, and in the region of their segment-shaped working surfaces 6a may have an abrasive coating.
  • the screws 8 are arranged inside the annular abrasive 7.
  • a bearing assembly 10 is provided in the central region thereof.
  • the wheel body 5 is seated with a central hole 13 on a journal 12a of the shaft 12, and is fixed against a bearing shoulder 12b of the shaft 12, e.g. means axially parallel fastening screws 14 which pass through the wheel body 5 in the hole edge region and are screwed into the shaft 12.
  • the thickness of the disc-shaped base body 5 preferably tapers radially outwardly, continuously or in steps, e.g. obliquely stepped, in particular on the working side 9 facing away from back 15.
  • the shaft 12 is preferably rotatably supported independently of the housing 2, being rotatable by a motor 16, in particular an electric motor, in the direction of rotation indicated by the arrow 17.
  • the shaft 12 is at once a motor shaft, wherein the motor housing 16a forms the associated pivot bearing and by means of mounting elements 16b (FIG. FIG. 4 ) eg on a carrier, not shown, of a FIGS. 1 and 2 indicated conveyor 19 for particular artificial stones 21 and bricks.
  • the conveyor 19 may e.g. two have here a vertical distance from each other having conveyor belts 19a, 19b, between which the stones 21 are held and moved on the working side 9 of the grinding wheel 4 in the height range over, with their grinding wheel 4 side facing machined. This is possible because the working side 9 of the grinding wheel 4 or the abrasive 7 projects beyond the front side of the housing 2.
  • the air stream 22 illustrated by arrows is generated by an air conveyor arranged on the grinding wheel 4 and designated in its entirety by 23, which may have one or more groups of paddle-shaped conveying elements.
  • the conveyor 23 is preferably designed so that it sucks the air from the back of the grinding wheel 4 approximately parallel to the axis and in the area of the grinding wheel 4 to the outside to the abrasive 7 towards promotes, the air flow 22 through the gaps 24 between the grinding lugs 7 a extends and at the periphery of the grinding wheel 4 in a grinding wheel 4 surrounding the conveying gap 2 d between the peripheral wall 2 b and the periphery of the grinding wheel 4 flows.
  • the conveying gap 2d is formed wedge-shaped divergent in the direction of rotation 17, wherein this divergence can extend to an outlet opening 25 of the housing 2.
  • this outlet opening 25 is in the region of the mounting side 3, e.g. below, arranged and formed in a mounting plate 26, with which the housing 2 to a support, e.g. on the conveyor 19, can be grown, e.g. by screws, not shown, enforce the screw holes 27 in the mounting plate 26.
  • the conveying gap 2d begins at the direction of rotation 17 facing the opening edge 25a, which is formed by an axially parallel extending end edge of the peripheral wall 2b.
  • the radial distance a of the peripheral wall 2b from the circumference of the grinding wheel 4 increases in the direction of rotation 17 progressively or helically, which has a favorable effect on the transport effect of the air flow for the machining dust.
  • the outlet opening 25 may, for example, be indirectly or directly connected to a collecting container.
  • the conveyor 23 preferably has a plurality of circumferentially spaced vane-shaped conveying elements 28, which suck in the air from the rear side 15 through flow openings 29 in the wheel body 5, for example in the number of conveying elements 28 , can be provided.
  • the air flow 22 can be sucked in from the rear free space 31, which surrounds the shaft 12 or the motor 16 and is adjacent to the grinding wheel 4 or housing 2 at the rear.
  • the conveying elements 28 are provided with associated flow openings 29.
  • the conveying elements 28 are formed by air blades, which have a conveying leg 28 a, which is inclined to the in FIG. 2 indicated rotational plane E extends and with this an acute angle W1 of eg about 20 to 40 °, in particular about 30 °, includes, wherein the conveying leg 28a extends obliquely in the direction of rotation 17.
  • the conveying element 28 may be attached to a part of the grinding wheel 4, for example indirectly or directly on the wheel body 5.
  • the conveying elements 28 may be arranged or fastened on the rear side of the wheel body 5.
  • a large conveying surface for the conveying leg 28 can be achieved if it extends at least partially through the associated flow opening 29, so that the thickness of the wheel body 5 can be utilized as a conveying surface section. It is particularly advantageous to fasten the delivery limb 28a in the region of the front side of the wheel body 5 and to arrange it so that it extends through the flow opening 29 towards the rear side 15 and projects beyond the wheel body 5 on the back, as is apparent in particular FIG. 2 can be seen.
  • the associated conveying element 28 may have a mounting leg 28b, for example, the front side of the wheel body 5, preferably sunk, arranged and secured, for example, through it in holes comprehensive and screwed into threaded holes of the wheel body 5 mounting screws.
  • the axially visible width b of the delivery leg 28a and the flow openings 29, respectively, is divergent radially outwardly, e.g. according to the existing radial divergence.
  • the conveyor 23 may have conveying elements 28 which suck air partial flows axially parallel and convey towards the abrasive 4, wherein the conveying elements 28 generate a delivery pressure through which the air flow 22 is advanced.
  • the air flow after the conveying elements 28 can be deflected radially outwards, e.g. back through the wheel body. 5
  • Such a radial guidance for the air flow 22 can be substantially improved if the conveying path extending essentially between the conveying elements 28 and the grinding means 7 is designed as a conveying gap 33.
  • a conveying gap 33 can be formed by a front-side disk 34, which is fixed at an axial distance c from the wheel body 5 and ends at a distance d in front of the abrasive 7, whereby an annular outflow gap 30b is formed.
  • the inner half of the slip ring body 6b may be reset with respect to the outer half carrying the abrasive 7, whereby the disc 34 may overlap the inner half of the slip ring 4 while maintaining the distance c or conveying gap 30a.
  • the disk 34 may e.g. abut against radial webs 36 of the wheel body 5 and be attached to this or the wheel body 5, preferably by fastening screws 37.
  • the conveying gap 33 is divided by the webs 36 in conveying gap segments.
  • the conveying elements 28 can also be designed so that they exert in the air flow 22 outwardly directed flow direction components on the air flow 22, whereby the air flow and the flow rate can be improved.
  • second or third conveying elements 38 which can be arranged offset radially outwards or can also be arranged one behind the other with respect to the outwardly directed flow direction.
  • second conveying elements 38 may be e.g. may be formed by the grinding lugs 7a, if they are arranged so that they form a blade-like shape or that they promote air in the function or rotary operation to the outside.
  • the gaps 39 extend between the grinding lugs 7a from the inside outward in the direction of rotation 17 facing away from the direction.
  • the column 39 may extend obliquely or curved, as shown in the embodiment in which each of the gap 39 with a tangent T at the periphery of the grinding wheel 4 and slip ring 6 includes an acute angle W2, for example, about 30 ° to 60 ° , in particular about 45 °.
  • the width e of the gap 39 may be, for example, 3 mm to 15 mm, in particular approximately 6 mm to 10 mm, the width e preferably increasing continuously outward. This has a favorable effect on the promotion of air and can be z. B.
  • the z. B. formed by lateral projections 7a conveying elements 38 are formed with a same in the direction of rotation 17 directed width g.
  • the inclined arrangement of the column 39 results in a luftschaufelförmige formation of the abrasive projections 7a, which causes the desired air delivery to the outside in the operation mode. It is particularly important here that the outwardly directed gap walls 39a extend in the above-described sense obliquely or rounded or curved.
  • the effectiveness of the air bucket-shaped conveying elements 38 can be improved if their according to Figures 2 and 5 only over a part of the radial dimension of the slip ring body 6b extending length L1 is increased.
  • the slip ring lugs 7a or the inwardly directed lateral lugs 7b for example, rounded or just about the associated radial dimension of the slip ring body 6b z. B. extend to the inner periphery, wherein the circumference of the disc 34 inside the slip ring body 6 b end may or may overlap him as it is Fig. 2 shows.
  • the outflow gap 30b is in the region of the inner edge or in the region of the slip ring body 6b, z. B. between the abrasive 7 and the disc 34th
  • the axial height of z. B. extended lugs 7b be equal to or less than the axial height of the slip ring lugs 7a. It may also be the extensions of the lugs 7b equipped with the abrasive 7 or not.
  • the embodiment according to FIG. 7 also shows lugs 7c, which are located as inner extensions of the lugs 7b within the slip ring body 6b on the wheel body 5 of the grinding wheel 4 or on the disc 34 and integrally formed thereon and may be secured to the wheel body 5 or to the disc 34.
  • the approaches 7b also form these approaches 7c in their width g z.
  • the disc 34 may abut and be supported on the lugs 7b and / or 7c, where they may form the webs 36.
  • the disc 34 may extend approximately to the inner ends of the lugs 7b or at least partially overlap the lugs 7b as it does Fig. 2 and 7 demonstrate. In this overlapping region, the conveying gap 30a is divided into inclined or rounded or curved conveying channels 33, which predetermine the direction of flow of the projections 7b and / or 7c, counter to the direction of rotation 17.
  • the width e of the gaps 39 extending between the lugs 7a, 7b, 7c is divergent to the outside.
  • the number of distributed on the circumference arranged approaches 7b or 7c may be less than the number of slip ring approaches 7a.
  • the number of latter can z. B. be two or three times as large.
  • the lugs 7b are missing on the slip ring.
  • radial webs 36 and attachment cam 36a may be provided for the disc 34.
  • the abrasive 7 may be formed by grinding plates 7d, which are attached to the slip ring body 6b facing away from the front sides of the projections 7a, for example by brazing or gluing, as it Fig. 2 . 7 and 8th show by way of example.
  • the housing 2 may be formed without rear wall 2a, so that the axial sections of the air flow 22 can flow in axially over the entire radial dimension r1 of the flow openings 29.
  • Figures 2 and 4 show a rear wall 2a, which has a central opening 41 which is greater than the cross-sectional dimension of the shaft 12, so that an effective annular opening 41 a results, whose outer diameter f is smaller than that in FIG. 3 shown radial dimension r1 of the flow openings 29.
  • the axially flowing air stream 22 is reduced in its outer cross-sectional size.
  • the grinding wheel 4 has an axial distance h from the rear wall 2a, with a concentric annular wall 42 extending therebetween, which is preferably fixed to the rear wall 2a and has a small distance from the wheel body 5.
  • the housing 2 has the rear wall 2a only in the region of the conveying gap 2d.
  • the housing is open at the back, that is, in the region of the rotating flow openings 29, the air flow 22 can flow axially over the entire radial dimension r1 of the flow openings 29.
  • annular wall 43 can project from the rear side of the wheel body 5 to the rear, which is located in the region of the outer edges of the flow openings 29 and radially limits the axially flowing air stream 22.
  • a coaxial annular wall 44 can protrude from the rear

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mining & Mineral Resources (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

The device has a central bearing arrangement for rotary mounting of the grinding wheel (4), a wheel body extending radially out from the bearing arrangement, a grinding medium (7) arranged in the outer peripheral region of the wheel body on its working side and feed elements (28) on the grinding wheel for feeding air from the side of the grinding wheel away from the working side out to the grinding medium. The wheel body has axial inflow openings (29) for the air in the regions surrounding the bearing arrangement.

Description

Die Erfindung betrifft ein Schleifrad nach dem Oberbegriff des Anspruchs 1.The invention relates to a grinding wheel according to the preamble of claim 1.

Es ist der Zweck eines solchen Schleifrads, Steine an ihrer Oberfläche spanabhebend zu bearbeiten, insbesondere zu planieren. Bei den Steinen kann es sich insbesondere um künstliche Steine wie Ziegel handeln, die nach ihrer Fertigung an ihrer Oberfläche z.B. von Schneidvorgängen stammende Grate aufweisen können, die der späteren Verarbeitung im Wege stehen und deshalb spanabhebend bearbeitet werden sollen.It is the purpose of such a grinding wheel to machine stones on their surface, in particular to plan. The stones may in particular be artificial stones, such as bricks, which, after their manufacture, are attached to their surface, e.g. may have ridges derived from cutting operations, which are the subsequent processing in the way and therefore to be machined.

Zur Ausführung der spanabhebenden Funktion weist das Schneidrad in seinem Umfangsbereich ein Schneidmittel auf, dass an einer planseitig angeordneten Arbeitsseite eines scheibenförmigen Radkörpers des Schleifrads eine Arbeitsfläche aufweist und an dieser Arbeitsseite des Schleifrads wirksam und für den zu bearbeitenden Gegenstand zugänglich ist.In order to carry out the cutting function, the cutting wheel has a cutting means in its peripheral region, which has a working surface on a working side of a disk-shaped wheel body of the grinding wheel and is effective on this working side of the grinding wheel and accessible to the object to be machined.

Im Funktionsbetrieb wird das Schleifrad durch einen Drehantrieb in Rotation versetzt, wobei das Schleifmittel in einer Ringzone rotiert. Zur Bearbeitung eines oder mehrerer Steine wird dieser oder werden diese auf einer Förderbahn an der Arbeitsseite des Schleifrads so vorbei bewegt, dass sie mit dem Schleifmittel in Kontakt geraten und spanabhebend bearbeitet werden. Bei dieser spanabhebenden Bearbeitung kann es sich um einen Schleif- oder Fräsvorgang handeln. Im Folgenden wird der Begriff "Schleifen" benutzt, weil diese Bezeichnung wenigstens in der Ziegelindustrie eingeführt ist.In functional operation, the grinding wheel is rotated by a rotary drive, wherein the abrasive rotates in a ring zone. For processing one or more stones, this or these are moved on a conveyor track on the working side of the grinding wheel over so that they come into contact with the abrasive and machined. This machining operation may be a grinding or milling operation. Hereinafter, the term "grinding" is used because this name is at least introduced in the brick industry.

Aus GB 686 260 A ist ein Schneidrad bekannt, welches insgesamt ein oben und unten offenes kegelstumpfförmiges Gebilde darstellt, dessen innere Mantelfläche über sechs Verstrebungssegmente mit einer zentralen Hohlachse verbunden ist, so dass der Kegelstumpf - auch nach Aufbringen der Hohlachse auf eine vertikale Antriebswelle - nach oben und unten offen ist. Die spanabhebenden Teile bzw. die Polierteller sind auf der unteren Stirnseitenfläche des Kegelstumpfes montiert, wodurch das Werkstück horizontal bearbeitet werden kann. Um einen Luftstrom durch das Innere des Schneidrades zu erzeugen, um so das Werkstück während der Bearbeitung kühlen sowie den Schneide- Fräs- oder Abrieb-Staub entfernen zu können, weisen die Verstrebungssegmente eine gleiche Neigung auf, was bei einer starken Rotationsbewegung des Schneidrades zu einem schiffschraubenförmigen Ansaugen bzw. Anblasen des Werkstückes mit der Umgebungsluft führt.Out GB 686 260 A a cutting wheel is known which represents a total of a top and bottom open frusto-conical structure whose inner circumferential surface is connected via six Verstrebungssegmente with a central hollow shaft, so that the Truncated cone - even after applying the hollow shaft to a vertical drive shaft - is open up and down. The cutting parts or the polishing plates are mounted on the lower end face of the truncated cone, whereby the workpiece can be processed horizontally. In order to generate an air flow through the interior of the cutting wheel, so as to cool the workpiece during processing and to remove the cutting, milling or abrasion dust, the Verstrebungssegmente an equal inclination, resulting in a strong rotational movement of the cutting wheel to a ship screw-shaped suction or blowing of the workpiece with the ambient air leads.

Aus DE 10 2004 057 336 B3 ist eine Schneidevorrichtung bekannt, bei welcher das Schneidrad mit einer Scheibe rückseitig abgedeckt ist und nur zwischen dem Scheibenrand und den Schleifsegmenten einen Zwischenraum (Luftspalt) aufweist. Über eine exzentrisch angeordnete Luftzufuhr kann bei geeigneter Dimensionierung dem Luftspalt eine ausreichende Luftmenge zugeführt werden die beim Austreten aus dem Luftspalt die Schleifsegmente kühlt und von Abrieb und Schleifstaub freihält.Out DE 10 2004 057 336 B3 a cutting device is known in which the cutting wheel is covered with a disc on the back and only between the disc edge and the abrasive segments has a gap (air gap). By means of an eccentrically arranged air supply, with suitable dimensioning, the air gap can be supplied with a sufficient quantity of air which, on leaving the air gap, cools the abrasive segments and keeps them free from abrasion and grinding dust.

Aus DE 834 518 C ist eine Schleifscheibe bekannt, welche als Laufrad einer Kreiselpumpe ausgebildet ist, indem ein Kühlmittel am Umfang auf der ganzen Scheibenbreite durch einen porösen oder mit Kanülen versehenen Schleifkranz gedrückt wird. Das Kühlmittel wird beispielsweise dem Laufrad durch die Welle zugeführt, über die das Laufrad geschoben ist.Out DE 834 518 C For example, a grinding wheel is known which is designed as an impeller of a centrifugal pump in that a coolant is pressed circumferentially on the entire wheel width through a porous or cannulated grinding wheel. The coolant is supplied, for example, the impeller by the shaft over which the impeller is pushed.

Aus DE 199 59 348 A1 ist eine Schleifscheibe für die Verwendung in einer Schleifvorrichtung bekannt, mit Antriebsschaufeln zur Staubabfuhr, um die Verteilung von Staub in der Luft zu verringern, und um die Kühlwirkung der Schleifscheibe zu erhöhen, so daß das Schleifvermögen verbessert und die Lebensdauer der Schleifscheibe verlängert werden.Out DE 199 59 348 A1 For example, a grinding wheel for use in a grinding apparatus is known, having dust removing drive vanes for reducing the distribution of dust in the air, and for increasing the cooling effect of the grinding wheel to improve the grinding ability and extend the life of the grinding wheel.

Ein Schneidrad der eingangs angegebenen Art ist in der DE 101 62 425 A1 beschrieben. Dieses vorbekannte Schleifrad weist einen sich von einer Lageranordnung radial nach außen erstreckenden Radkörper auf, an den arbeitsseitig ein scheibenförmiger Abdeckkörper mit axialem Abstand zum Radkörper montierbar ist, wobei zwischen dem Radkörper und dem Abdeckkörper angeordnete Förderelemente Luft durch eine Hohlwelle der Lageranordnung von der der Arbeitsseite abgewandten Seite des Schleifrads her ansaugen und nach außen zum Schleifmittel hin fördern.A cutting wheel of the type specified is in the DE 101 62 425 A1 described. This prior art grinding wheel has a radially outwardly extending from a bearing assembly wheel body on the working side, a disc-shaped cover body with axial distance to the wheel body is mounted, wherein arranged between the wheel body and the cover body Conveying elements suck in air through a hollow shaft of the bearing assembly from the side facing away from the working side of the grinding wheel ago and promote outward to the abrasive out.

Bei diesem vorbekannten Schleifrad ist die Luftzuführung beschränkt, und zwar aus mehreren Gründen. Zum einen erstreckt sich ein Luftzuführungskanal durch eine als Hohlwelle ausgebildete Motorwelle. Aufgrund der beträchtlich langen Hohlwelle und aufgrund einer angestrebten kleinen Bauweise steht nicht nur ein verhältnismäßig kleiner Luftzuführungsquerschnitt zur Verfügung, sondern die Luftzuführung ist auch aufgrund aus der beträchtlichen Länge der Hohlwelle resultierenden Leitungsverlusten verhältnismäßig gering.In this prior art grinding wheel, the air supply is limited, and for several reasons. On the one hand, an air supply duct extends through a motor shaft designed as a hollow shaft. Due to the considerably long hollow shaft and due to a desired small construction not only a relatively small air supply cross section is available, but the air supply is relatively low due to the considerable length of the hollow shaft resulting line losses.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Schleifrad der eingangs angegebenen Art die Luftzuführung zu verbessern. Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.The invention has for its object to improve the air supply in a grinding wheel of the type specified. This object is solved by the features of claim 1. Advantageous developments of the invention are described in the subclaims.

Beim erfindungsgemäßen Schleifrad weist der Radkörper in seinem die Lageranordnung umgebenden Bereich axiale Einströmungsöffnungen für die Luft auf, wobei die schaufelförmigen Förderelemente in der Strömungsrichtung vor oder in den Einströmungsöffnungen angeordnet sind. Durch diese Strömungsöffnungen kann Luft aus den rückseitig vom Schleifrad angeordneten und die Lageranordnung umgebenden Bereich strömen. Dabei kann die Luft durch die Strömungsöffnungen gesaugt oder gefördert bzw. gedrückt werden, je nach dem, wo die Förderelemente bezüglich den Strömungsöffnungen angeordnet sind.In the grinding wheel according to the invention, the wheel body in its area surrounding the bearing assembly axial flow openings for the air, wherein the paddle-shaped conveying elements are arranged in the flow direction before or in the inflow openings. Through these flow openings, air can flow out of the region arranged at the rear from the grinding wheel and surrounding the bearing arrangement. In this case, the air can be sucked through the flow openings or conveyed or pressed, depending on where the conveying elements are arranged with respect to the flow openings.

Eine besonders leistungsfähige Konstruktion ergibt sich daraus, dass, die Förderelemente erfindungsgemäß von der Rückseite des Radkörpers abstehen. Bei einer solchen Ausgestaltung wirken die Förderelemente direkt mit der Luft zusammen, die sich in dem die Lageranordnung umgebenden Bereich befindet und sich im stehenden Zustand oder in einem geringer bewegten Zustand befindet als wie es dann der Fall wäre, wenn die Förderelemente im drehenden Schleifrad angeordnet wären, wie es beim Stand der Technik der Fall ist.A particularly powerful construction results from the fact that, according to the invention, the conveying elements protrude from the rear side of the wheel body. In such an embodiment, the conveying elements cooperate directly with the air which is in the area surrounding the bearing arrangement and is in the standing state or in a low moving state than would be the case if the conveying elements were arranged in the rotating grinding wheel , as is the case in the prior art.

Dabei ist es besonders vorteilhaft, wenn die schaufelförmige Förderelemente sich durch die Strömungsöffnungen vorzugsweise bis zur Vorderseite des Radkörpers hin erstrecken. Bei einer solchen Ausgestaltung kann auch der sich im axialen Erstreckungsbereich des Radkörpers befindliche Förderflächenabschnitt der Förderelemente als aktiv fördernder Abschnitt ausgenutzt und somit die Schaufelfläche axial vergrößert werden.It is particularly advantageous if the paddle-shaped conveying elements through the flow openings preferably down to the front of the wheel body extend. In such a configuration, the conveying surface section of the conveying elements located in the axial extension region of the wheel body can also be utilized as an actively conveying section, and thus the blade surface can be axially enlarged.

Ein weiterer Vorteil der erfindungsgemäßen Ausgestaltung besteht darin, dass für die Strömungsöffnungen nicht nur aufgrund einer wählbaren Anzahl, sondern auch aufgrund des zur Verfügung stehenden radialen Bereichs große Querschnittsabmessungen zur Verfügung stehen und deshalb große axiale Durchflussquerschnitte erreichbar sind, die eine leistungsfähige Luftzuführung ermöglichen bzw. gewährleisten.Another advantage of the embodiment according to the invention is that large cross-sectional dimensions are available for the flow openings not only because of a selectable number but also because of the available radial area and therefore large axial flow cross sections are achievable, which enable or ensure efficient air supply ,

Außerdem führt die erfindungsgemäße Ausgestaltung zu einer verbesserten Motorkühlung, da die axial zugeführte Luft die Außenmantelfläche des Motors großflächig bestreichen kann.In addition, the inventive design leads to improved engine cooling, since the axially supplied air can coat the outer surface of the engine over a large area.

Es ist zur weiteren Verbesserung der Luftführung vorteilhaft, am Radkörper vorderseitig eine Scheibe anzuordnen, die sich radial nach außen bis in die Nähe des Schneidmittels erstreckt und zwischen ihr und dem Radkörper einen gemeinsamen Strömungsspalt oder mehrere in der Umfangsrichtung hintereinander angeordnete Strömungsspalte begrenzt, die am Rand der Scheibe ausmünden und das Schneidmittel leistungsfähig kühlen können. Zur weiteren Verbesserung der Staubabführung und/oder Kühlung des Schneidmittels können zusätzlich zu ersten Förderelementen zweite Förderelemente vorgesehen sein, die bezüglich den ersten Förderelementen radial nach außen versetzt sind. Dabei ist es auch möglich, nur die zweiten Förderelemente anstelle der ersten Förderelemente vorzusehen, so dass letztere entfallen können.It is advantageous for further improving the air flow to arrange on the wheel body on the front side a disc which extends radially outwards to the vicinity of the cutting means and defines between it and the wheel body a common flow gap or more in the circumferential direction successively arranged flow gaps, which at the edge exit the disc and the cutting means can cool efficiently. To further improve the dust removal and / or cooling of the cutting means, in addition to first conveying elements, second conveying elements can be provided which are offset radially outward with respect to the first conveying elements. It is also possible to provide only the second conveying elements instead of the first conveying elements, so that the latter can be omitted.

Im Rahmen der Erfindung lässt sich die Förderung der Luft durch Verdrängungswirkung oder durch Saugwirkung erreichen. Die Wirksamkeit ist dann groß, wenn die sich im wesentlichen radial von innen nach außen erstreckende Abmessung der Förderelemente verhältnismäßig groß ist. Dabei ist es besonders vorteilhaft, wenn die z. B. durch seitliche Ansätze gebildeten Förderelemente sich vom Umfangsbereich der Einströmungsöffnungen nach außen bis zum Schneidmittel bzw. zu einem das Schneidmittel tragenden Schleifring, oder bis in dessen Bereich hinein erstrecken. Wenn darüber hinaus die zwischen den Ansätzen gebildeten Spalte axial beidseitig geschlossen sind, z. B. durch eine Scheibe, ergeben sich zwischen dem Radkörper und einer solchen Abdeckung nach außen erstreckende Kanäle, in denen sich die Luftströmung ungestört bilden und fortpflanzen kann.In the context of the invention, the promotion of air can be achieved by displacement effect or by suction. The effectiveness is great when the dimension of the conveying elements, which extends essentially radially from the inside to the outside, is relatively large. It is particularly advantageous if the z. B. formed by lateral projections conveyor elements extending from the peripheral region of the inflow outward to the cutting means or to a slip ring carrying the cutting means, or extending into its area. Moreover, if the gaps formed between the approaches are axially closed on both sides, z. B. by a disc, arise between the wheel center and such a cover outwardly extending channels in which the air flow can form undisturbed and propagate.

Die seitlichen Ansätze können z. B. durch im Querschnitt viereckige Leisten gebildet sein, deren sich in die Drehrichtung erstreckende Abmessung vorzugsweise gleich ist. Bei einer solchen Ausgestaltung weisen die sich zwischen den Ansätzen erstreckenden Spalte bzw. Kanäle eine in die Drehrichtung erstreckende Breite auf, die sich radial nach außen kontinuierlich vergrößert. Dies wirkt sich im Förderbetrieb vorteilhaft auf die Luftströmung aus. In einem solchen Fall, in dem ein das Schleifmittel tragender Schleifring vorhanden ist, können sich die z. B. durch seitliche Ansätze gebildeten Förderelemente bis zum inneren Umfangsbereich des Schleifrings oder, z. B. zweistückig, auch im Bereich des Schleifrings erstrecken, z. B. bis zu den in dessen Umfangsbereich angeordneten Schleifelementen.The lateral approaches can z. B. be formed by rectangular in cross-section bars whose extending in the direction of rotation dimension is preferably the same. In such an embodiment, the gaps or channels extending between the lugs have a width extending in the direction of rotation, which width increases continuously radially outward. This has an advantageous effect on the air flow in the delivery mode. In such a case, in which a grinding ring carrying the abrasive is present, the z. B. by lateral projections formed conveying elements to the inner peripheral portion of the slip ring or, z. B. two-piece, also extend in the region of the slip ring, z. B. up to the arranged in its peripheral region grinding elements.

Die erfindungsgemäßen Ausgestaltungen mit der verbesserten Luftführung eignen sich auch vorteilhaft zur Anordnung des Schleifrads in einem Gehäuse, dass das Schleifrad mit einem Förderspalt umgibt, dessen radiale Breite in die Drehrichtung zunimmt, z.B. progressiv zunimmt und sich zu einer Auslassöffnung im Gehäuse erstreckt. Hierdurch lässt sich der im Arbeitsbetrieb anfallende Staub vorteilhaft entfernen und z.B. in einer Sammeleinrichtung sammeln. Dabei ermöglicht die erfindungsgemäße Ausgestaltung eine Abführung des Arbeitsstaubes bzw. der Bearbeitungsspäne, ohne dass es einer besonderen Absaugvorrichtung bedarf, die mit einem zusätzlichen Antrieb versehen sein müsste. Bei der erfindungsgemäßen Ausgestaltung wird als Antrieb für die Staubabführung der Drehantrieb für das Schneidrad benutzt.The improved air guide embodiments of the present invention are also advantageously suitable for mounting the grinding wheel in a housing that surrounds the grinding wheel with a conveying nip whose radial width increases in the direction of rotation, e.g. progressively increases and extends to an outlet opening in the housing. As a result, the dust produced during operation can advantageously be removed and, for example, removed. collect in a collection facility. In this case, the inventive design allows removal of the working dust or machining chips, without the need for a special suction device, which would have to be provided with an additional drive. In the embodiment according to the invention is used as a drive for the dust removal of the rotary drive for the cutting wheel.

Weitere Weiterbildungen der Erfindung tragen zu einer kleinen und funktionsfähigen Konstruktion bei, die sich vorteilhaft in eine Fertigungslinie für Gegenstände bzw. Steine integrieren lässt und außerdem eine kostengünstige Herstellung ermöglichen.Further developments of the invention contribute to a small and functional design, which can be advantageously integrated into a production line for objects or stones and also enable cost-effective production.

Nachfolgend werden vorteilhafte Ausgestaltungen und Merkmale der Erfindung anhand von vorteilhaften Ausführungsbeispielen und Zeichnungen näher erläutert. Es zeigt:

Figur 1
ein Bearbeitungsmodul für eine Fertigungslinie zum Herstellen von natürlichen oder künstlichen Steinen, z.B. Ziegeln oder Dachpfannen, in der Blickrichtung axial auf die Arbeitsseite eines in das Bearbeitungsmodul integrierten Schleifrads;
Figur 2
das Bearbeitungsmodul im Schnitt II-II in Figur 1, wobei die Scheibe dargestellt ist;
Figur 3
das Schleifrad in perspektivischer Rückansicht,
Figur 4
das Bearbeitungsmodul in perspektivischer Rückansicht;
Figur 5
die in Figur 1 mit X gekennzeichnete Einzelheit in vergrößerter Darstellung;
Figur 6
ein Bearbeitungsmodul in abgewandelter Ausgestaltung in perspektivischer Rückansicht;
Figur 7
den oberen Bereich eines Schleifrades in abgewandelter Ausgestaltung in perspektivischer Vorderansicht;
Fig. 8
ein Schleifrad in weiter abgewandelter Ausgestaltung in perspektivischer Darstellung.
Hereinafter, advantageous embodiments and features of the invention will be explained in more detail with reference to advantageous embodiments and drawings. It shows:
FIG. 1
a processing module for a production line for producing natural or artificial stones, eg bricks or roof tiles, in the viewing direction axially on the working side of a grinding wheel integrated into the processing module;
FIG. 2
the editing module in section II-II in FIG. 1 wherein the disk is shown;
FIG. 3
the grinding wheel in perspective rear view,
FIG. 4
the processing module in perspective rear view;
FIG. 5
in the FIG. 1 with X marked detail in an enlarged view;
FIG. 6
a processing module in a modified embodiment in perspective rear view;
FIG. 7
the upper portion of a grinding wheel in a modified embodiment in a perspective front view;
Fig. 8
a grinding wheel in a further modified embodiment in perspective view.

Das in seiner Gesamtheit mit 1 bezeichnete Bearbeitungsmodul weist ein Gehäuse 2 mit einer Anbauseite 3 auf, das an einer vorzugsweise vertikalen Vorderseite offen ist und eine z.B. aus mehreren Wandteilen bestehende Rückwand 2a und eine von dieser seitlich abstehende Umfangswand 2b aufweist, die einen Gehäuseraum 2c begrenzen, in dem ein Schleifrad 4 angeordnet ist.The machining module, denoted by 1 in its entirety, comprises a housing 2 with a mounting side 3 which is open on a preferably vertical front side and which has e.g. comprising a plurality of wall parts existing rear wall 2a and a laterally projecting from this peripheral wall 2b, which delimit a housing space 2c, in which a grinding wheel 4 is arranged.

Das Schleifrad 4 weist einen scheibenförmigen Radkörper 5 und einen in dessen Umfangsbereich befestigten Schleifring 6 auf, der ein vorzugsweise ringförmig auf seinem Umfangsbereich verteiltes und daran befestigtes Schleifmittel 7 trägt und selbst im Umfangsbereich des Radkörpers 5 an diesem befestigt ist, z.B. durch mehrere auf dem Umfang verteilt angeordnete Schrauben 8, deren Köpfe vorzugsweise im Schleifring 6 versenkt angeordnet sind. Beim Ausführungsbeispiel weist der Radkörper 5 eine umfangsseitig und zu einer Arbeitsseite 9 des Schleifrads 4 hin auslaufende Ringnut 11 auf, in der der Schleifring 6 angepasst sitzt.The grinding wheel 4 has a disk-shaped wheel body 5 and a slip ring 6 fixed in its peripheral region, which carries a preferably annularly distributed on its peripheral region and secured thereto abrasive 7 and even in the peripheral region of the wheel body 5 is fixed thereto, for example by several distributed circumferentially arranged screws 8, the heads are preferably arranged sunk in the slip ring 6. In the exemplary embodiment, the wheel body 5 has an annular groove 11 which expires circumferentially and which extends toward a working side 9 of the grinding wheel 4, in which the slip ring 6 is fitted.

Das Schleifmittel 7 ist im Umfangsbereich des Schleifrings 6 angeordnet, wobei es vom Schleifring 6 arbeitsseitig axial absteht, so dass seine etwa radial verlaufende Arbeitsfläche 6a vom Schleifringkörper 6b axial versetzt ist.The abrasive 7 is arranged in the peripheral region of the slip ring 6, wherein it projects axially from the slip ring 6 on the working side, so that its approximately radially extending working surface 6a is axially offset from the slip ring body 6b.

Das Schleifmittel 7 kann z.B. durch eine Vielzahl auf dem Umfang verteilt angeordnete und somit einen in der Umfangsrichtung gerichteten Abstand voneinander aufweisende Schleifansätze 7a gebildet sein, die am Schleifringkörper 6b befestigt sind, z.B. durch Löten oder Kleben, und im Bereich ihrer segmentförmigen Arbeitsflächen 6a einen abrasiven Belag aufweisen können. Die Schrauben 8 sind innerhalb des ringförmigen Schleifmittels 7 angeordnet.The abrasive 7 may be e.g. formed by a plurality of circumferentially spaced and thus circumferentially directed spaced abrasive grits 7a fixed to the slip ring body 6b, e.g. by soldering or gluing, and in the region of their segment-shaped working surfaces 6a may have an abrasive coating. The screws 8 are arranged inside the annular abrasive 7.

Zur Befestigung und Lagerung des Schleifrads 4 bzw. des Radkörpers 5, vorzugsweise auf einer Welle 12, ist in dessen zentralem Bereich eine Lageranordnung 10 vorgesehen. Beim Ausführungsbeispiel sitzt der Radkörper 5 mit einem zentralen Loch 13 auf einem Lagerzapfen 12a der Welle 12, und er ist gegen eine Lagerschulter 12b der Welle 12 befestigt, z.B. mittel achsparallelen Befestigungsschrauben 14, die den Radkörper 5 im Lochrandbereich durchfassen und in die Welle 12 eingeschraubt sind. Die Dicke des scheibenförmigen Basisköpers 5 verjüngt sich vorzugsweise radial nach außen kontinuierlich oder stufenförmig, z.B. schräg-stufenförmig, insbesondere auf der der Arbeitsseite 9 abgewandten Rückseite 15.For mounting and supporting the grinding wheel 4 and the wheel body 5, preferably on a shaft 12, a bearing assembly 10 is provided in the central region thereof. In the embodiment, the wheel body 5 is seated with a central hole 13 on a journal 12a of the shaft 12, and is fixed against a bearing shoulder 12b of the shaft 12, e.g. means axially parallel fastening screws 14 which pass through the wheel body 5 in the hole edge region and are screwed into the shaft 12. The thickness of the disc-shaped base body 5 preferably tapers radially outwardly, continuously or in steps, e.g. obliquely stepped, in particular on the working side 9 facing away from back 15.

Die Welle 12 ist vorzugsweise unabhängig vom Gehäuse 2 drehbar gelagert, wobei sie durch einen Motor 16, insbesondere einen Elektromotor, drehbar ist, und zwar in die durch den Pfeil 17 verdeutliche Drehrichtung. Beim Ausführungsbeispiel ist die Welle 12 sogleich Motorwelle, wobei das Motorgehäuse 16a das zugehörige Drehlager bildet und mittels Anbauelementen 16b (Figur 4) z.B. an einem nicht dargestellten Träger eines in Figur 1 und 2 angedeuteten Förderers 19 für insbesondere künstliche Steine 21 bzw. Ziegel.The shaft 12 is preferably rotatably supported independently of the housing 2, being rotatable by a motor 16, in particular an electric motor, in the direction of rotation indicated by the arrow 17. In the exemplary embodiment, the shaft 12 is at once a motor shaft, wherein the motor housing 16a forms the associated pivot bearing and by means of mounting elements 16b (FIG. FIG. 4 ) eg on a carrier, not shown, of a FIGS. 1 and 2 indicated conveyor 19 for particular artificial stones 21 and bricks.

Der Förderer 19 kann z.B. zwei einen hier vertikalen Abstand voneinander aufweisende Förderbänder 19a, 19b aufweisen, zwischen denen die Steine 21 gehalten sind und an der Arbeitsseite 9 des Schleifrads 4 in dessen Höhenbereich vorbei bewegt werden, wobei ihre dem Schleifrad 4 zugewandte Seite spanabhebend bearbeitet wird. Dies ist möglich, da die Arbeitsseite 9 des Schleifrads 4 bzw. das Schleifmittel 7 die Vorderseite des Gehäuses 2 überragt.The conveyor 19 may e.g. two have here a vertical distance from each other having conveyor belts 19a, 19b, between which the stones 21 are held and moved on the working side 9 of the grinding wheel 4 in the height range over, with their grinding wheel 4 side facing machined. This is possible because the working side 9 of the grinding wheel 4 or the abrasive 7 projects beyond the front side of the housing 2.

Bei dieser spanabhebenden Bearbeitung entsteht Bearbeitungs- bzw. Schleifstaub im Bereich des Schleifrades 4, der durch einen Luftstrom 22 gezielt abtransportiert und zu einer nicht dargestellten Entsorgungseinrichtung geführt wird. Der durch Pfeile verdeutlichte Luftstrom 22 wird durch eine am Schleifrad 4 angeordnete und in ihrer Gesamtheit mit 23 bezeichnete Luft-Fördereinrichtung erzeugt, die eine oder mehrere Gruppen von schaufelförmigen Förderelementen aufweisen kann. Die Fördereinrichtung 23 ist vorzugsweise so ausgebildet, dass sie die Luft von der Rückseite des Schleifrads 4 her etwa achsparallel ansaugt und im Bereich des Schleifrads 4 nach außen zu dem Schleifmittel 7 hin fördert, wobei der Luftstrom 22 sich durch die Spalte 24 zwischen den Schleifansätzen 7a erstreckt und am Umfang des Schleifrads 4 in einem das Schleifrad 4 umgebenden Förderspalt 2d zwischen der Umfangswand 2b und dem Umfang des Schleifrads 4 strömt. Der Förderspalt 2d ist in der Drehrichtung 17 keilförmig divergent ausgebildet, wobei sich diese Divergenz bis zu einer Auslassöffnung 25 des Gehäuses 2 erstrecken kann. Beim Ausführungsbeispiel ist diese Auslassöffnung 25 im Bereich der Anbauseite 3, z.B. unten, angeordnet und in einer Anbauplatte 26 ausgebildet, mit der das Gehäuse 2 an einem Träger, z.B. am Förderer 19, angebaut sein kann, z.B. durch nicht dargestellte Schrauben, die Schraubenlöcher 27 in der Anbauplatte 26 durchsetzen.In this machining machining or grinding dust in the region of the grinding wheel 4, which is transported away by an air flow 22 targeted and guided to a disposal facility, not shown. The air stream 22 illustrated by arrows is generated by an air conveyor arranged on the grinding wheel 4 and designated in its entirety by 23, which may have one or more groups of paddle-shaped conveying elements. The conveyor 23 is preferably designed so that it sucks the air from the back of the grinding wheel 4 approximately parallel to the axis and in the area of the grinding wheel 4 to the outside to the abrasive 7 towards promotes, the air flow 22 through the gaps 24 between the grinding lugs 7 a extends and at the periphery of the grinding wheel 4 in a grinding wheel 4 surrounding the conveying gap 2 d between the peripheral wall 2 b and the periphery of the grinding wheel 4 flows. The conveying gap 2d is formed wedge-shaped divergent in the direction of rotation 17, wherein this divergence can extend to an outlet opening 25 of the housing 2. In the embodiment, this outlet opening 25 is in the region of the mounting side 3, e.g. below, arranged and formed in a mounting plate 26, with which the housing 2 to a support, e.g. on the conveyor 19, can be grown, e.g. by screws, not shown, enforce the screw holes 27 in the mounting plate 26.

Der Förderspalt 2d beginnt an der Drehrichtung 17 zugewandten Öffnungsrand 25a, der durch eine sich achsparallel erstreckende Endkante der Umfangswand 2b gebildet ist. Der radiale Abstand a der Umfangswand 2b vom Umfang des Schleifrads 4 vergrößert sich in die Drehrichtung 17 progressiv bzw. schneckenhausförmig, was sich günstig auf die Transportwirkung des Luftstroms für den Bearbeitungsstaub auswirkt. Die Auslassöffnung 25 kann z.B. mittelbar oder unmittelbar mit einem Sammelbehälter verbunden sein.The conveying gap 2d begins at the direction of rotation 17 facing the opening edge 25a, which is formed by an axially parallel extending end edge of the peripheral wall 2b. The radial distance a of the peripheral wall 2b from the circumference of the grinding wheel 4 increases in the direction of rotation 17 progressively or helically, which has a favorable effect on the transport effect of the air flow for the machining dust. The outlet opening 25 may, for example, be indirectly or directly connected to a collecting container.

Zur Erzeugung des Luftstroms 22 weist die Fördereinrichtung 23 am Schleifrad 4 vorzugsweise mehrere auf dem Umfang verteilt angeordnete schaufelförmige Förderelemente 28 auf, die die Luft von der Rückseite 15 her ansaugen und zwar durch Strömungsöffnungen 29 im Radkörper 5, die z.B. in der Anzahl der Förderelemente 28, vorgesehen sein können. Der Luftstrom 22 kann aus dem rückseitigen Freiraum 31 angesaugt werden, der die Welle 12 bzw. den Motor 16 umgibt und dem Schleifrad 4 bzw. Gehäuse 2 rückseitig benachbart ist. Der radiale Abstand des oder der durch ein einziges oder mehrere auf dem Umfang verteilt angeordnete Förderelemente 28 erzeugte axiale Abschnitt des Luftstroms 22 bzw. axiale Teilluftströme, entspricht im wesentlichen dem radialen Abstand der Strömungsöffnungen 29 bzw. der Förderelemente 28 von der Drehachse 4a des Schleifrads 4 bzw. der Welle 12. Beim vorliegenden Ausführungsbeispiel sind sechs Stück Förderelemente 28 mit zugehörigen Strömungsöffnungen 29 vorgesehen. Die Förderelemente 28 sind durch Luftschaufeln gebildet, die einen Förderschenkel 28a aufweisen, der sich schräg zur in Figur 2 angedeuteten Drehebene E erstreckt und mit dieser einen spitzen Winkel W1 von z.B. etwa 20 bis 40°, insbesondere etwa 30°, einschließt, wobei der Förderschenkel 28a sich in die Drehrichtung 17 schräg erstreckt. Um die Drehmitnahme zu gewährleisten, können die Förderelement 28 an einem Teil des Schleifrads 4 befestigt sein, z.B. mittelbar oder unmittelbar am Radkörper 5. Dabei können die Förderelemente 28 an der Rückseite des Radkörpers 5 angeordnet bzw. befestigt sein.To generate the air flow 22, the conveyor 23 preferably has a plurality of circumferentially spaced vane-shaped conveying elements 28, which suck in the air from the rear side 15 through flow openings 29 in the wheel body 5, for example in the number of conveying elements 28 , can be provided. The air flow 22 can be sucked in from the rear free space 31, which surrounds the shaft 12 or the motor 16 and is adjacent to the grinding wheel 4 or housing 2 at the rear. The radial distance of the or the distributed through a single or more distributed on the circumference arranged conveying elements 28 axial portion of the air flow 22 and axial partial air flows, substantially corresponds to the radial distance of the flow openings 29 and the conveying elements 28 from the rotation axis 4a of the grinding wheel 4th or the shaft 12. In the present embodiment, six piece conveying elements 28 are provided with associated flow openings 29. The conveying elements 28 are formed by air blades, which have a conveying leg 28 a, which is inclined to the in FIG. 2 indicated rotational plane E extends and with this an acute angle W1 of eg about 20 to 40 °, in particular about 30 °, includes, wherein the conveying leg 28a extends obliquely in the direction of rotation 17. In order to ensure rotational drive, the conveying element 28 may be attached to a part of the grinding wheel 4, for example indirectly or directly on the wheel body 5. The conveying elements 28 may be arranged or fastened on the rear side of the wheel body 5.

Es lässt sich jeweils eine große Förderfläche für den Förderschenkel 28 erreichen, wenn dieser sich wenigstens teilweise durch die zugehörigen Strömungsöffnung 29 erstreckt, so dass die Dicke des Radkörpers 5 als Förderflächenabschnitt ausgenutzt werden kann. Es ist besonders vorteilhaft, den Förderschenkel 28a im Bereich der Vorderseite des Radkörpers 5 zu befestigen und so anzuordnen, dass er sich durch die Strömungsöffnung 29 zur Rückseite 15 hin erstreckt und den Radkörper 5 rückseitig überragt, wie es insbesondere aus Figur 2 zu entnehmen ist. Zur Befestigung des Förderschenkels 28a als separates Bauteil kann das zugehörige Förderelement 28 einen Befestigungsschenkel 28b aufweisen, der z.B. vorderseitig am Radkörper 5, vorzugsweise versenkt, angeordnet und befestigt sein kann, z.B. durch ihn in Löchern durchfassende und in Gewindelöcher des Radkörpers 5 eingeschraubte Befestigungsschrauben.In each case, a large conveying surface for the conveying leg 28 can be achieved if it extends at least partially through the associated flow opening 29, so that the thickness of the wheel body 5 can be utilized as a conveying surface section. It is particularly advantageous to fasten the delivery limb 28a in the region of the front side of the wheel body 5 and to arrange it so that it extends through the flow opening 29 towards the rear side 15 and projects beyond the wheel body 5 on the back, as is apparent in particular FIG. 2 can be seen. For attachment of the delivery leg 28a as a separate component, the associated conveying element 28 may have a mounting leg 28b, for example, the front side of the wheel body 5, preferably sunk, arranged and secured, for example, through it in holes comprehensive and screwed into threaded holes of the wheel body 5 mounting screws.

Die axial sichtbare Breite b des Förderschenkels 28a bzw. der Strömungsöffnungen 29 ist radial nach außen divergent, z.B. entsprechend der vorhandenen Radialdivergenz.The axially visible width b of the delivery leg 28a and the flow openings 29, respectively, is divergent radially outwardly, e.g. according to the existing radial divergence.

Im Rahmen der Erfindung kann die Fördereinrichtung 23 Förderelemente 28 aufweisen, die Luftteilströme achsparallel ansaugen und zum Schleifmittel 4 hin fördern, wobei die Förderelemente 28 einen Förderdruck erzeugen, durch den der Luftstrom 22 vorbewegt wird. Dabei kann der Luftstrom nach den Förderelementen 28 radial nach außen umgelenkt werden, z.B. rückseitig durch den Radkörper 5.In the context of the invention, the conveyor 23 may have conveying elements 28 which suck air partial flows axially parallel and convey towards the abrasive 4, wherein the conveying elements 28 generate a delivery pressure through which the air flow 22 is advanced. In this case, the air flow after the conveying elements 28 can be deflected radially outwards, e.g. back through the wheel body. 5

Eine solche Radialführung für den Luftstrom 22 lässt sich wesentlich verbessern, wenn die sich im Wesentlichen zwischen den Förderelementen 28 und dem Schleifmittel 7 erstreckende Förderstrecke als Förderspalt 33 ausgebildet wird. Ein solcher Förderspalt 33 lässt sich durch eine vorderseitige Scheibe 34 bilden, die in einem axialen Abstand c vom Radkörper 5 befestigt ist und in einem Abstand d vor dem Schleifmittel 7 endet, wodurch ein ringförmiger Ausströmungsspalt 30b gebildet ist. Die innere Hälfte des Schleifringkörpers 6b kann bezüglich der das Schleifmittel 7 tragenden äußeren Hälfte zurückgesetzt sein, wodurch die Scheibe 34 bei Beibehaltung des Abstands c bzw. Förderspaltes 30a die innere Hälfte des Schleifringes 4 überlappen kann.Such a radial guidance for the air flow 22 can be substantially improved if the conveying path extending essentially between the conveying elements 28 and the grinding means 7 is designed as a conveying gap 33. Such a conveying gap 33 can be formed by a front-side disk 34, which is fixed at an axial distance c from the wheel body 5 and ends at a distance d in front of the abrasive 7, whereby an annular outflow gap 30b is formed. The inner half of the slip ring body 6b may be reset with respect to the outer half carrying the abrasive 7, whereby the disc 34 may overlap the inner half of the slip ring 4 while maintaining the distance c or conveying gap 30a.

Die Scheibe 34 kann z.B. an radialen Stegen 36 des Radkörpers 5 anliegen und an diesen oder dem Radkörper 5 befestigt sein, vorzugsweise durch Befestigungsschrauben 37. Wenn sich die Stege 36 radial durchgehend erstrecken, wird der Förderspalt 33 durch die Stege 36 in Förderspaltsegmente unterteilt.The disk 34 may e.g. abut against radial webs 36 of the wheel body 5 and be attached to this or the wheel body 5, preferably by fastening screws 37. When the webs 36 extend radially through, the conveying gap 33 is divided by the webs 36 in conveying gap segments.

Da die Scheibe 34 in ihrem Zentrum geschlossen ist, kann die von den Förderelementen 28 angesaugte Luft nur nach außen ausweichen, wobei sie an der Scheibe 34 umgelenkt wird. Die Förderelemente 28 können aber auch so ausgebildet sein, dass sie im Luftstrom 22 nach außen gerichtete Strömungsrichtungskomponenten auf den Luftstrom 22 ausüben, wodurch die Luftströmung und die Förderleistung verbessert werden.Since the disc 34 is closed in its center, the sucked by the conveying elements 28 air can escape only to the outside, wherein it is deflected at the disc 34. However, the conveying elements 28 can also be designed so that they exert in the air flow 22 outwardly directed flow direction components on the air flow 22, whereby the air flow and the flow rate can be improved.

Um Letzteres weiter zu verbessern, ist es vorteilhaft, am Schleifrad 4 zusätzlich zu den ersten Förderelementen 28 zweite oder auch dritte Förderelemente 38 vorzusehen, die radial nach außen versetzt angeordnet sein können oder auch bezüglich der nach außen gerichteten Strömungsrichtung hintereinander liegend angeordnet sein können.In order to further improve the latter, it is advantageous to provide on the grinding wheel 4, in addition to the first conveying elements 28, second or third conveying elements 38 which can be arranged offset radially outwards or can also be arranged one behind the other with respect to the outwardly directed flow direction.

Weitere bzw. zweite Förderelemente 38 können z.B. durch die Schleifansätze 7a gebildet sein, wenn sie so schaufelförmig angeordnet bzw. ausgebildet sind, dass sie im Funktions- bzw. Drehbetrieb Luft nach außen fördern.Further and second conveying elements 38 may be e.g. may be formed by the grinding lugs 7a, if they are arranged so that they form a blade-like shape or that they promote air in the function or rotary operation to the outside.

Wie insbesondere die vergrößerte Darstellung gemäß Figur 5 zeigt, erstrecken sich die Spalte 39 zwischen den Schleifansätzen 7a von innen nach außen in die der Drehrichtung 17 abgewandte Richtung. Dabei können sich die Spalte 39 schräg oder kurvenförmig erstrecken, wie es das Ausführungsbeispiel zeigt, bei dem jeweils der Spalt 39 mit einer Tangente T am Umfang des Schleifrades 4 bzw. Schleifringes 6 einen spitzen Winkel W2 einschließt, der z.B. etwa 30° bis 60°, insbesondere etwa 45°, beträgt. Die Breite e des Spalts 39 kann z.B. 3mm bis 15mm, insbesondere etwa 6mm bis 10mm, betragen, wobei die Breite e sich nach außen vorzugsweise kontinuierlich vergrößert. Dies wirkt sich auf die Luftförderung günstig aus und lässt sich z. B. dadurch erreichen, dass die z. B. durch seitliche Ansätze 7a gebildeten Förderelemente 38 mit einer gleichen in die Drehrichtung 17 gerichteten Breite g ausgebildet sind. Die geneigte Anordnung der Spalte 39 ergibt eine luftschaufelförmige Ausbildung der Schleifansätze 7a, die im Funktionsbetrieb die angestrebte Luftförderung nach außen bewirkt. Hierbei ist insbesondere wesentlich, dass die nach außen gerichteten Spaltwände 39a sich im vorbeschriebenen Sinne schräg oder gerundet bzw. kurvenförmig erstrecken.As in particular the enlarged view according to FIG. 5 shows, the gaps 39 extend between the grinding lugs 7a from the inside outward in the direction of rotation 17 facing away from the direction. In this case, the column 39 may extend obliquely or curved, as shown in the embodiment in which each of the gap 39 with a tangent T at the periphery of the grinding wheel 4 and slip ring 6 includes an acute angle W2, for example, about 30 ° to 60 ° , in particular about 45 °. The width e of the gap 39 may be, for example, 3 mm to 15 mm, in particular approximately 6 mm to 10 mm, the width e preferably increasing continuously outward. This has a favorable effect on the promotion of air and can be z. B. thereby achieve that the z. B. formed by lateral projections 7a conveying elements 38 are formed with a same in the direction of rotation 17 directed width g. The inclined arrangement of the column 39 results in a luftschaufelförmige formation of the abrasive projections 7a, which causes the desired air delivery to the outside in the operation mode. It is particularly important here that the outwardly directed gap walls 39a extend in the above-described sense obliquely or rounded or curved.

Die Wirksamkeit der luftschaufelförmigen Förderelemente 38 lässt sich verbessern, wenn ihre sich gemäß Figuren 2 und 5 nur über einen Teil der radialen Abmessung des Schleifringkörpers 6b erstreckende Länge L1 vergrößert wird. Beim Ausführungsbeispiel nach Figur 7 können die Schleifringansätze 7a oder die davon nach innen gerichteten seitlichen Ansätze 7b, sich z.B. gerundet oder gerade über die zugehörige Radialabmessung des Schleifringkörpers 6b z. B. bis zu dessen Innenumfang erstrecken, wobei der Umfang der Scheibe 34 innen am Schleifringkörper 6b enden kann oder ihn überlappen kann, wie es Fig. 2 zeigt. Bei einer solchen Ausgestaltung befindet sich der Ausströmungsspalt 30b im Bereich des inneren Randes oder im Bereich des Schleifringkörpers 6b, z. B. zwischen dem Schleifmittel 7 und der Scheibe 34.The effectiveness of the air bucket-shaped conveying elements 38 can be improved if their according to Figures 2 and 5 only over a part of the radial dimension of the slip ring body 6b extending length L1 is increased. According to the embodiment FIG. 7 For example, the slip ring lugs 7a or the inwardly directed lateral lugs 7b, for example, rounded or just about the associated radial dimension of the slip ring body 6b z. B. extend to the inner periphery, wherein the circumference of the disc 34 inside the slip ring body 6 b end may or may overlap him as it is Fig. 2 shows. In such an embodiment, the outflow gap 30b is in the region of the inner edge or in the region of the slip ring body 6b, z. B. between the abrasive 7 and the disc 34th

Dabei kann die axiale Höhe der z. B. verlängerten Ansätze 7b gleich oder geringer sein als die axiale Höhe der Schleifringansätze 7a. Es können auch die Verlängerungen der Ansätze 7b mit dem Schleifmittel 7 bestückt sein oder auch nicht.In this case, the axial height of z. B. extended lugs 7b be equal to or less than the axial height of the slip ring lugs 7a. It may also be the extensions of the lugs 7b equipped with the abrasive 7 or not.

Das Ausführungsbeispiel gemäß Figur 7 zeigt außerdem Ansätze 7c, die sich als innere Verlängerungen der Ansätze 7b innerhalb des Schleifringkörpers 6b am Radkörper 5 des Schleifrades 4 oder an der Scheibe 34 befinden und daran einteilig ausgebildet und am Radkörper 5 oder an der Scheibe 34 befestigt sein können. Wie bereits die Ansätze 7b bilden auch diese Ansätze 7c in ihrer Breite g z. B. verjüngte Verlängerungen der Ansätze 7a, wobei auch die Ansätze 7c sich gerade oder gerundet bzw. kurvenförmig erstrecken können. Es können z. B. die Ansätze 7b gerade und die Ansätze 7c gerundet bzw. kurvenförmig ausgebildet sein. Die Scheibe 34 kann an den Ansätzen 7b und/oder 7c anliegen und abgestützt sein, wobei sie die Stege 36 bilden können.The embodiment according to FIG. 7 also shows lugs 7c, which are located as inner extensions of the lugs 7b within the slip ring body 6b on the wheel body 5 of the grinding wheel 4 or on the disc 34 and integrally formed thereon and may be secured to the wheel body 5 or to the disc 34. As already the approaches 7b also form these approaches 7c in their width g z. B. tapered extensions of the lugs 7 a, wherein the lugs 7 c can extend straight or rounded or curved. It can z. B. the lugs 7b straight and the lugs 7c be rounded or curved. The disc 34 may abut and be supported on the lugs 7b and / or 7c, where they may form the webs 36.

Die Scheibe 34 kann sich etwa bis zu den inneren Enden der Ansätze 7b erstrecken oder die Ansätze 7b wenigstens teilweise überlappen, wie es Fig. 2 und 7 zeigen. In diesem Überlappungsbereich ist der Förderspalt 30a in sich entgegen der Drehrichtung 17 schräg oder gerundet bzw. kurvenförmig erstreckende Förderkanäle 33 unterteilt, die eine der Erstreckung der Ansätze 7b und/oder 7c entsprechende Strömungsrichtung vorgeben.The disc 34 may extend approximately to the inner ends of the lugs 7b or at least partially overlap the lugs 7b as it does Fig. 2 and 7 demonstrate. In this overlapping region, the conveying gap 30a is divided into inclined or rounded or curved conveying channels 33, which predetermine the direction of flow of the projections 7b and / or 7c, counter to the direction of rotation 17.

Bei allen Ausführungsbeispielen ist erkennbar, dass die Breite e der sich zwischen den Ansätzen 7a, 7b, 7c erstreckenden Spalte 39 nach außen divergent ist.In all embodiments, it can be seen that the width e of the gaps 39 extending between the lugs 7a, 7b, 7c is divergent to the outside.

Wie aus Fig. 7 beispielhaft zu entnehmen ist, kann die Anzahl der auf dem Umfang verteilt angeordneten Ansätze 7b oder auch 7c geringer sein als die Anzahl der Schleifringansätze 7a. Die Anzahl letzterer kann z. B. zwei- oder dreimal so groß sein. Beim Ausführungsbeispiel nach Fig. 8, bei dem gleiche oder vergleichbare Teile mit gleichen Bezugszahlen versehen sind, fehlen die Ansätze 7b am Schleifring. Es sind die Ansätze 7c am Radkörper 5 und vorzugsweise die das Schleifmittel 7 bildenden Ansätze 7a vorhanden.How out Fig. 7 can be seen by way of example, the number of distributed on the circumference arranged approaches 7b or 7c may be less than the number of slip ring approaches 7a. The number of latter can z. B. be two or three times as large. According to the embodiment Fig. 8 , in which the same or comparable parts are provided with the same reference numerals, the lugs 7b are missing on the slip ring. There are the lugs 7c on the wheel body 5 and preferably the abrasive 7 forming lugs 7a available.

Anstelle von radialen Stegen 36 können auch Befestigungsnocken 36a für die Scheibe 34 vorgesehen sein.Instead of radial webs 36 and attachment cam 36a may be provided for the disc 34.

Im Rahmen der Erfindung kann bei allen Ausführungsbeispielen das Schleifmittel 7 durch Schleifplättchen 7d gebildet sein, die an den dem Schleifringkörper 6b abgewandten Frontseiten der Ansätze 7a befestigt sind, z.B. durch Hartlöten oder Kleben, wie es Fig. 2, 7 und 8 beispielhaft zeigen.In the context of the invention, in all embodiments, the abrasive 7 may be formed by grinding plates 7d, which are attached to the slip ring body 6b facing away from the front sides of the projections 7a, for example by brazing or gluing, as it Fig. 2 . 7 and 8th show by way of example.

Im Rahmen der Erfindung kann das Gehäuse 2 ohne Rückwand 2a ausgebildet sein, so dass die axialen Abschnitte des Luftstroms 22 über die gesamte radiale Abmessung r1 der Strömungsöffnungen 29 axial einströmen können.In the context of the invention, the housing 2 may be formed without rear wall 2a, so that the axial sections of the air flow 22 can flow in axially over the entire radial dimension r1 of the flow openings 29.

Figuren 2 und 4 zeigen eine Rückwand 2a, die eine zentrale Öffnung 41 aufweist, die größer ist als die Querschnittsabmessung der Welle 12, so dass sich eine wirksame Ringöffnung 41 a ergibt, deren Außendurchmesser f kleiner ist als die in Figur 3 dargestellte Radialabmessung r1 der Strömungsöffnungen 29. Hierdurch wird der axial einströmende Luftstrom 22 in seiner Außenquerschnittsgröße verringert. Figures 2 and 4 show a rear wall 2a, which has a central opening 41 which is greater than the cross-sectional dimension of the shaft 12, so that an effective annular opening 41 a results, whose outer diameter f is smaller than that in FIG. 3 shown radial dimension r1 of the flow openings 29. As a result, the axially flowing air stream 22 is reduced in its outer cross-sectional size.

Aus Figur 2 ist außerdem zu erkennen, dass das Schleifrad 4 einen axialen Abstand h von der Rückwand 2a aufweist, wobei sich dazwischen eine konzentrische Ringwand 42 erstrecken kann, die vorzugsweise an der Rückwand 2a befestigt ist und einen kleinen Abstand vom Radkörper 5 aufweist.Out FIG. 2 It can also be seen that the grinding wheel 4 has an axial distance h from the rear wall 2a, with a concentric annular wall 42 extending therebetween, which is preferably fixed to the rear wall 2a and has a small distance from the wheel body 5.

Beim Ausführungsbeispiel nach Figur 6 weist das Gehäuse 2 die Rückwand 2a nur im Bereich des Förderspaltes 2d auf. Innerhalb des Förderspaltes 2d ist das Gehäuse rückseitig offen, das heißt im Bereich der drehenden Strömungsöffnungen 29 kann der Luftstrom 22 axial über die gesamte Radialabmessung r1 der Strömungsöffnungen 29 einströmen.According to the embodiment FIG. 6 For example, the housing 2 has the rear wall 2a only in the region of the conveying gap 2d. Within the conveying gap 2d, the housing is open at the back, that is, in the region of the rotating flow openings 29, the air flow 22 can flow axially over the entire radial dimension r1 of the flow openings 29.

Zur Verbesserung der Luftströmung 22 vor den Strömungsöffnungen 29 kann von der Rückseite des Radkörpers 5 eine Ringwand 43 nach hinten abstehen, die sich im Bereich der äußeren Ränder der Strömungsöffnungen 29 befindet und den axial einströmenden Luftstrom 22 radial begrenzt.To improve the air flow 22 in front of the flow openings 29, an annular wall 43 can project from the rear side of the wheel body 5 to the rear, which is located in the region of the outer edges of the flow openings 29 and radially limits the axially flowing air stream 22.

Zur Stabilisierung der ringförmigen Rückwand 2a im Bereich des Förderspaltes 2d kann bei allen Ausführungsbeispielen eine koaxiale Ringwand 44 rückseitig absteheTo stabilize the annular rear wall 2a in the region of the conveying gap 2d, in all embodiments a coaxial annular wall 44 can protrude from the rear

Claims (13)

  1. A grinding wheel (4) for material-removing machining of objects, especially natural or artificial stones (21), with a central bearing arrangement (10) for the rotary mounting of the grinding wheel (4),
    a disc-shaped wheel element (5), which extends radially outwards from the bearing arrangement (10), and a grinding ring (6) attached in its peripheral region,
    and a grinding means (7) arranged in the peripheral region of the grinding ring (6) which projects in an axial direction from the grinding ring (6) at the work side and is formed by a plurality of grinding attachments (7a) distributed around the periphery and arranged with a spacing distance from one another directed in the peripheral direction, wherein the wheel element (5) provides axial inlet openings (29) for air in its region surrounding the bearing arrangement (10), through which the air can be pumped from the rear side of the grinding wheel (4) facing away from the work side (9) towards the work side and outwards towards the grinding means (7),
    characterised in that
    paddle-shaped pumping elements (28) for pumping the air are provided, which are arranged in front of the inlet openings (29) and attached to the rear side of the wheel element (5) projecting from the latter at the rear,
    or are arranged within the inlet openings (29) and project beyond the wheel element (5) at the rear.
  2. The grinding wheel according to claim 1,
    characterised in that,
    in the case in which the pumping elements (28) are arranged within the inlet openings (29), the pumping elements (28) extend at least in part into the inlet openings (29), especially up to the work side (9) of the wheel element (5).
  3. The grinding wheel according to claim 1 or 2,
    characterised in that
    the pumping elements (28) provide pumping arms (28a) extending in each case radially and in a diagonal or diagonally rounded manner with reference to the plane of rotation (E).
  4. The grinding wheel according to any one of the preceding claims,
    characterised in that
    the pumping elements (28) each provide a fastening arm (28b), with which they are fastened to the wheel element (5).
  5. The grinding wheel according to claim 2 and 4,
    characterised in that
    the fastening arms (28b) are fastened to the wheel element (5) at the front side.
  6. The grinding wheel according to any one of the preceding claims,
    characterised in that,
    at the front side of the wheel element (5), a disc (34) is arranged, which extends radially outwards up to the proximity of the grinding attachments (7a), wherein a common pumping gap (30a) or several pumping gaps (30a) arranged one behind the other in the peripheral direction extend outwards between the disc (34) and the wheel elements (5).
  7. The grinding wheel according to any one of the preceding claims,
    characterised in that,
    in addition to the first pumping elements (28), second pumping elements (7b; 7c; 38) are provided at the work side of the wheel element (5), which are radially offset towards the outside with reference to the first pumping elements (28).
  8. The grinding wheel according to claim 7,
    characterised in that
    the pumping elements (7b; 7c; 38) are formed by the limiting surfaces of gaps (39), which extend in a diagonal or diagonally rounded manner towards the outside.in the direction facing away from the direction of rotation (17).
  9. The grinding wheel according to claim 8,
    characterised in that
    the gaps (39) extend between the grinding attachments (7a).
  10. The grinding wheel according to claim 8 or 9,
    characterised in that
    the gaps (39) are formed by elongated attachments (7a; 7b; 7c), which are arranged on the wheel element (5) or on the disc (34) and/or on the grinding ring (6) bearing the grinding attachments (7a).
  11. The grinding wheel according to claim 7,
    characterised in that
    the second pumping elements (38) are formed by the grinding attachments (7a).
  12. The grinding wheel according to any one of the preceding claims,
    characterised in that
    it is arranged in a housing (2) which surrounds the grinding wheel (4) with a diverging pumping gap (2d), which opens into an outlet opening (25).
  13. The grinding wheel according to any one of the preceding claims,
    characterised in that
    it is mounted with the bearing arrangement (10) on a shaft (12) which, at the side of the grinding wheel (4) facing away from the work side (9), projects away from the latter and is preferably a motor shaft mounted in a motor (16).
EP07103859A 2006-03-09 2007-03-09 Grinding wheel for machining objects, in particular natural or artificial stones Active EP1832386B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006010975A DE102006010975B4 (en) 2006-03-09 2006-03-09 Grinding wheel for machining objects, in particular natural or artificial stones

Publications (2)

Publication Number Publication Date
EP1832386A1 EP1832386A1 (en) 2007-09-12
EP1832386B1 true EP1832386B1 (en) 2011-01-19

Family

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Application Number Title Priority Date Filing Date
EP07103859A Active EP1832386B1 (en) 2006-03-09 2007-03-09 Grinding wheel for machining objects, in particular natural or artificial stones

Country Status (3)

Country Link
EP (1) EP1832386B1 (en)
AT (1) ATE495854T1 (en)
DE (2) DE102006010975B4 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5550940B2 (en) * 2010-02-23 2014-07-16 株式会社ディスコ Transport mechanism
ITUA20162251A1 (en) * 2016-04-01 2017-10-01 Ancora Spa COOLING AND SUCTION SYSTEM FOR POLISHING HEADS OF CERAMIC PRODUCTS OR NATURAL STONES
CN107486767A (en) * 2017-09-13 2017-12-19 北京世纪明达建设有限公司 A kind of sanding and polishing, the integrated machine head of dust suction
CN109333220B (en) * 2018-10-16 2024-01-30 刘小辉 Sedimentation type edge grinding machine and edge grinding processing method thereof

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE834518C (en) 1950-04-15 1952-03-20 Dieko Bruins Dipl Ing Grinding wheel with self-cooling
GB686260A (en) 1950-05-17 1953-01-21 William Ewart Davies Improvements relating to rotary cutting tools for example grinding wheels
DE1716701U (en) * 1955-06-01 1956-02-09 Guntmar Schober Grosshandlung DEVICE FOR INTERNAL LUBRICATION AND COOLING WATER SUPPLY FOR SLIP PIPE, SLIP RINGS AND SEGMENT HEADS OD. DGL.
DE1103181B (en) * 1955-07-21 1961-03-23 Licentia Gmbh Power tool, in particular angle grinder, with a fan wheel arranged on the working shaft directly behind the grinding wheel
DE8914505U1 (en) * 1989-12-09 1990-03-08 Krebs & Riedel Schleifscheibenfabrik GmbH & Co. KG, 3522 Bad Karlshafen Cup-shaped boron nitride grinding wheel with cooling channels
KR100314287B1 (en) 1999-07-29 2001-11-23 김세광 Grinding wheel
DE10162425A1 (en) * 2001-12-18 2003-07-10 Novoceric Transportanlagen Gmb Processing device and method for operating a processing device
DE102004057336B3 (en) 2004-11-27 2006-01-05 Wassmer, Paul Dry grinding machine for ceramic or cement-bonded workpieces has eccentric air input to intermediate cavity between guide sheet and carrier
DE102005043548A1 (en) * 2005-05-06 2006-11-09 Hans Lingl Anlagenbau Und Verfahrenstechnik Gmbh & Co. Kg Grinding disc e.g. for grinding wheel, has grinding elements for grinding objects and pumping segments which are used and placed for pumping fluid during grinding in radial direction of grinding disc

Also Published As

Publication number Publication date
DE102006010975B4 (en) 2008-04-03
ATE495854T1 (en) 2011-02-15
EP1832386A1 (en) 2007-09-12
DE102006010975A1 (en) 2007-09-13
DE502007006280D1 (en) 2011-03-03

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