EP3107687A1 - Mandrin amélioré pour le calibrage, le lissage ou le polissage de matériaux pierreux au moyen de têtes abrasives tournantes - Google Patents

Mandrin amélioré pour le calibrage, le lissage ou le polissage de matériaux pierreux au moyen de têtes abrasives tournantes

Info

Publication number
EP3107687A1
EP3107687A1 EP15714276.1A EP15714276A EP3107687A1 EP 3107687 A1 EP3107687 A1 EP 3107687A1 EP 15714276 A EP15714276 A EP 15714276A EP 3107687 A1 EP3107687 A1 EP 3107687A1
Authority
EP
European Patent Office
Prior art keywords
mandrel
rotation
shaft
sliding
supporting plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15714276.1A
Other languages
German (de)
English (en)
Other versions
EP3107687B1 (fr
Inventor
Giambattista PEDRINI
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.)
Pedrini SpA ad Unico Socio
Original Assignee
Pedrini SpA ad Unico Socio
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 Pedrini SpA ad Unico Socio filed Critical Pedrini SpA ad Unico Socio
Publication of EP3107687A1 publication Critical patent/EP3107687A1/fr
Application granted granted Critical
Publication of EP3107687B1 publication Critical patent/EP3107687B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto

Definitions

  • the invention relates to an inherently balanced mandrel bearing heads for sizing, smoothing or polishing natural stone materials and/or ceramic tiles, namely a mandrel put in rotation on the surface being worked to transmit the rotation to said heads with a rotation axis normal to the surface to be worked, such as slabs, strips or tiles of granite, hard stones, marble or porcelain stoneware, which is made particularly advantageous in the balancing and adjustment both during assembly and operation to perform delicate operations of sizing of the thickness of the materials, smoothing or polishing of the surfaces that require high precision.
  • Prior art is made particularly advantageous in the balancing and adjustment both during assembly and operation to perform delicate operations of sizing of the thickness of the materials, smoothing or polishing of the surfaces that require high precision.
  • the prior art includes mandrels for supporting and driving the most varied types of heads with a rotation axis normal to the surface being worked wherein the activation of the mandrel occurs with a belt drive and therefore with the need to arrange the related electric motor on an axis parallel with respect to the rotation axis of the mandrel.
  • most of the mass of the complex that is mobile and adjustable with respect to the surface being worked that is to say, the mandrel, electric motor and rotating head complex, has a centre of gravity resulting forcedly far from the axis of the mandrel.
  • Said structure is made up of a suitably bent and welded sheet metal and has the seat of fixing of said mandrel to be adjusted to the exact position required in the working of the material; therefore it is necessary to position in a correct way said mandrel on said supporting structure and in the art it is known to shim on the sides the flange of fixing of the tubular housing of said mandrel to said structure, in such a way as to compensate for small differences or building errors of said metal supporting structure. Said operation is uncomfortable and requires a considerable testing work with successive attempts to reach the exact laying and position required for the axis of the mandrel.
  • the document EP 1536916 which describes a mandrel for supporting rotating heads in which a pair of electric motors is placed in a balanced way on the mobile body, in the vertical direction, of the mandrel; a gear transmission connects the driving shafts of the electric motors to the mandrel itself; the motion in the vertical direction is realized with a pneumatic piston coaxial to the mandrel; finally, the sleeve for mounting the mandrel on the structure of the machine that houses it has a pair of curved surfaces for the fine adjustment of the position of the axis of the mandrel on the structure of the machine at the moment of assembly.
  • mandrels for rotating abrasive heads are known in which a pair of actuating cylinders are adjacent to the sleeve of the vertically sliding mandrel and operate in the flange of connection of the mandrel to the transmission of motion from a pair of electric motors to the mandrel advantageously made by means of belts alternatively connected to one of the driving pulleys of one of the motors and to the other driving pulley of the other motor.
  • the heads mounted on said mandrels are also, often, replaced with others, which are always rotating, but which due to the different shape of the abrasive elements need a different transmission ratio in said belt drive.
  • the mandrel with the connected head has a considerable inertia at the moment of start, in such a way as to require the detachment of the head with the abrasive elements from the surface being worked to prevent damaging it.
  • the start and stop occur even several times in the work shift for various reasons besides that of start after a technical intervention and/or a maintenance intervention. It was found that as at start the inertia of the electric motors-drive-mandrel shaft-rotating head complex with the abrasive elements is high, the start must be carried out in a position far from the surface being worked.
  • the new mandrel can allow to eliminate vibrations of the head at start due to inertia.
  • an improved mandrel for sizing, smoothing or polishing stone materials with rotating abrasive heads comprising: a sleeve within which a body of the mandrel is sliding that in its turn is provided with a shaft at whose end a rotating head with abrasive tools is applied; a pair of actuating cylinders for the positioning of said mandrel, that is to say, of the head connected to it, on the supporting metal structure; a pair of electric motors of activation in rotation of said mandrel and a drive from said motors to the shaft of the mandrel; said motors are coupled in rotation with the shaft of the mandrel with a belt drive; characterised in that it has the coupling between a supporting plate of the balanced drive connected to the body of the mandrel sliding within said adjustable sleeve, realized by a disjointable coupling in which screws clamp radial lobes of the body of the mandrel
  • the lobes are advantageously made on an applied ring connected to the upper end of the sliding body of the mandrel.
  • a tongue provided with an axially inclined end, is inserted within a hollow longitudinal to the axis of the mandrel and interposed between the sliding body of the mandrel and its adjustable sleeve; said hollow has at its lower end a correspondingly inclined shape connectable to the end of the tongue.
  • Figure 1 is a schematic side view of the mandrel, according to the invention, mounted on the structure of the machine and provided with standard electric motors operating said mandrel and holed shaft for the passage of the water feeding pipe;
  • Figure 2 is a schematic axial section rotated by a right angle with respect to the previous view of the shaft of the mandrel and supporting structure of the machine; the Figure also shows the locking tongue of the mandrel in a lifted position.
  • Figure 3 is a schematic axial section with the actuating cylinders of the body of the mandrel in which one can see simultaneously the balanced drive, the pneumatic cylinders of vertical positioning of the mandrel and the mandrel with the fixed sleeve and the mobile body sliding in it, which here is shown, for illustration simplicity, with the axial plane of the cylinders coincident with that of the electric motors and belt drive, which are usually made on intersecting axial planes, but not coincident as in the Figure; the Figure also shows the locking tongue of the mandrel in a lifted position;
  • Figure 4 is a schematic axial section with the actuating cylinders of the body of the mandrel as the previous Figure 3, in which the position of the mandrel is lifted and one can see the locking tongue of the sliding body of the mandrel inserted in the end of its seat;
  • FIG. 5 is a simplified schematic plan view, V-V of Figure 4, of the supporting plate of the belt drive in which one can see that the plate with the drive is centrally connected to the end of the body of the mandrel;
  • Figure 6 is a schematic view, similar to the previous Figure in which the supporting plate of the belt drive is in a position of rapid replacement, with the fitting to the internal diameter that enables its axial disjointing from the body of the mandrel.
  • FIG. 1 indicates the mandrel for supporting in rotation a head with abrasive tools of the known type, not shown, to the metal structure 2 of a generic machine tool for sizing, smoothing and/or polishing stone materials of granite, hard stones or marble, or even tiles of porcelain stoneware; said mandrel is fixed to the structure 2 by means of an adjustable sleeve 3 provided with a spherical surface 4 in the upper end for the position of rest of a flange 5 on an applied ring 6, which is spherical too and is welded to said metal structure 2 of support of the mandrels with the abrasive tool heads of the machine.
  • an adjustable sleeve 3 provided with a spherical surface 4 in the upper end for the position of rest of a flange 5 on an applied ring 6, which is spherical too and is welded to said metal structure 2 of support of the mandrels with the abrasive tool heads of the machine.
  • the fixing of said flange 5 is made by means of screws 7 that clamp it to the mandrel 1 in the precise position of adjustment on the working surface of the machine tool, while, at the other lower end of said sleeve 3, the guiding occurs by the contact of a spherical band 8 of a casing 10 external to the adjustable sleeve, with a cylindrical seat of an applied ring 9 in the supporting metal structure 2.
  • the Figures also show a body 12, of said mandrel 1 , sliding along the axis of the adjustable sleeve 3 under the action of two pneumatic cylinders 13 connected by means of the end of the rod 14 to an upper flange 15, which in its turn is connected to said body 12 of the mandrel, the upper flange also supporting a balanced belt drive 16.
  • the adjustable sleeve 3 has on the external casing 10 in the lower part of the mandrel 1 , to house in a telescopic way, a circular case 11 in its axial motion of lowering and lifting as it is connected to the lower end of the body 12 of the mandrel: the external casing 10 also realizes the guiding contact between said adjustable sleeve 3 with the band 8 on the ring 9 in spherical contact.
  • the sliding of the mandrel 1 upwards, for the detachment of the head from the surface being worked, can be seen in Figure 4 so as to connect and eliminate the clearances of guiding with the rotation between the sleeve 3 and the body 12 of the mandrel axially sliding therein.
  • the inclined end 21 of the tongue 20 couples with the lower end 23 of the hollow 22 and prevents oscillations or vibrations when the mandrel, the motors and the connected head start rotating.
  • the balanced drive 16 is made by means of supports 31 of the electric motors 17 connected in diametrically opposite positions with respect to the shaft 24 on the flange 5.
  • Each shaft of electric motor 17 has a driving pulley 32 or 33 having a diameter suitable to transmit the desired rotation drive to the shaft 24 of the mandrel 1 ; on the shaft 24 a pulley 34 is fitted having a greater diameter with a number of circumferential grooves for V belts 35 or 36 equal to the sum of the number of grooves present on the driving pulleys 32 and 33, fitted on the shafts of the electric motors; the number of the grooves is an even number for the pulley 34, while the number of the grooves on the driving pulleys is half the number of the grooves on the pulley 34: five grooves in each pulley 32 or 33 are shown in the Figure.
  • the V belts present in the pulley 34 are housed in an alternate way on grooves corresponding to those of the driving pulleys 32 and 33 aligned to them; that is to say, all the belts 35 and 36 are housed in the grooves of the pulley 34, fitted on the shaft 24 of the mandrel 1 , and are subdivided in an alternate way, 35 in the driving pulley 32 and 36 in the driving pulley 33, fitted on the driving shafts of the electric motors 17.
  • the assembly of the complete mandrel 1 to the supporting metal structure 2 occurs by introducing the adjustable sleeve 3 into said structure 2 and by clamping the screws 7 after aligning it in the correct vertical adjustment position with respect to the working surface of the machine.
  • the screws 7 clamp the flange 5 of the adjustable sleeve 3 within holes having a diameter considerably greater than their own shank and with large washers 48 also enabling the clamping with substantial reciprocal inclinations between said metal structure 2 and said adjustable sleeve 3.
  • the clamping of said screws 7 allows to lock the position, also inclined, of said adjustable sleeve by swinging in the spherical contact 4 between the flange 5 of the adjustable sleeve and the ring 6 fixed to said structure 2.
  • the spherical band 8 allows the adjustable sleeve to take said inclined position without losing the contact with the corresponding cylindrical surface in the ring 9 with which it is coupled.
  • the balanced belt drive 16 works as a usual belt drive, but the arrangement of the masses of the electric motors 17, as ballast resting on the supporting plate 15, allows to act with greater effectiveness in the working steps that a specific machine has to perform on the surface of the stone materials being worked. In fact, the mass of the electric motors and of the drive has the centre of gravity coincident with the rotation axis of the shaft 24 of the mandrel 1 .
  • the arrangement of the belts in an alternate way on the pulley 33, fitted on the shaft 24, towards the driving pulley 32 or towards the driving pulley 33 allows to balance the draw of the belts on the rotation axis of the pulleys in the drive where they are inserted; that is to say, the described arrangement allows also in the presence of a means, namely the belt drive, which by itself generates unbalance, to remain well balanced for the symmetry of the masses, of the forces and of the necessary reactions of the supporting plate 15 to make effective the drive 16 between the two electric motors of the standard type and the mandrel 1 that needs feeding of water inside its rotating shaft 24, to enable the correct operation of the rotating head with abrasive elements.
  • the presence of the tongue 20 with the inclined lower end 21 allows to eliminate the vibration at the moment of the starting in rotation of the motors 17, drive 16, shaft 24 and rotating head with abrasive elements complex.
  • This locking is practical and rapid in its application, in fact, the tongue 20, as shown in Figure 4, removes the possibility of rotational movements due to the minimum clearance in the sliding coupling of the body 12 of the mandrel with respect to the sleeve 3 that is fixed as said to the metal structure 2.
  • the stop of the vibration at start occurs only in the preferred starting position in which the body 12 of the mandrel is completely lifted.
  • the shape of the coupling between the supporting plate 15 of the belt drive 16 and the body 12 of the mandrel enables a fast replacement of the drive 16 to adjust the actual gear ratio to the specific rotation need that may be required from a rotating head with abrasive elements.
  • the lobes 39 can be disjointed from the coupling for their passage in the ports 41 provided on the supporting plate 15.
  • the lobes 39 are advantageously made on an applied ring 42 connected to the upper end 43 of the sliding body 12 of the mandrel
  • the plate has the lugs 40 provided with threaded holes 44 to house the screws 38 when tightened.
  • the presence of the tongue 20 with the inclined end 21 combined with the hollow 22 that has the similarly inclined lower end 23, realizes in a simple and effective way the solution to the technical problem of limiting the vibrations at the start of the rotation of the complex of the motors 17, belt drive 16, holed shaft 24 and rotating head with the abrasive elements that are set in movement.
  • disjointable coupling 37 allows to make practical and fast the maintenance of the improved mandrel for rotating heads with abrasive elements, in such a way as to realize a precise rotation speed of the head for its most correct use.
  • the adjustable sleeve 3 to reduce costs, can be made fixed to the structure 2 of the machine on which it is mounted, and, moreover, the belt drive 16 being able to be of the usual type, that is to say, with the simple arrangement of only two belts or analogous known ways of arranging the belts, different from what has been widely described above.

Abstract

La présente invention concerne un mandrin amélioré pour le calibrage, le lissage ou le polissage de matériaux pierreux au moyen de têtes abrasives tournantes, comprenant : un manchon à l'intérieur duquel coulisse un corps (12) du mandrin, qui est à son tour pourvu d'un arbre (22) à l'extrémité duquel est appliquée une tête tournante comportant des outils abrasifs; une paire de cylindres d'actionnement (13) permettant de positionner ledit mandrin (1), à savoir la tête reliée à celui-ci, sur la structure métallique (2) de support; une paire de moteurs électriques permettant d'entraîner en rotation le mandrin et un entraînement à partir desdits moteurs vers l'arbre (22) du mandrin; lesdits moteurs étant accouplés en rotation à l'arbre du mandrin au moyen d'une courroie d'entraînement; et enfin, l'accouplement entre une plaque de support (15) de la courroie d'entraînement (16) reliée au corps (12) du mandrin coulissant à l'intérieur dudit manchon réglable (3) étant réalisé au moyen d'un accouplement amovible (37) dans lequel des vis (38) serrent des lobes radiaux (39) du corps du mandrin à des pattes (40), qui sont agencées au centre de la plaque de support (15); les lobes radiaux (39) alternant avec des orifices (41) de sorte à permettre le passage au moyen d'un dégagement des pattes (40) lors de la séparation de l'accouplement avec la rotation de la plaque de support (15).
EP15714276.1A 2014-02-18 2015-02-18 Mandrin amélioré pour le calibrage, le lissage ou le polissage de matériaux pierreux au moyen de têtes abrasives tournantes Active EP3107687B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO20140034 2014-02-18
PCT/IB2015/000185 WO2015124990A1 (fr) 2014-02-18 2015-02-18 Mandrin amélioré pour le calibrage, le lissage ou le polissage de matériaux pierreux au moyen de têtes abrasives tournantes

Publications (2)

Publication Number Publication Date
EP3107687A1 true EP3107687A1 (fr) 2016-12-28
EP3107687B1 EP3107687B1 (fr) 2018-04-11

Family

ID=50624976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15714276.1A Active EP3107687B1 (fr) 2014-02-18 2015-02-18 Mandrin amélioré pour le calibrage, le lissage ou le polissage de matériaux pierreux au moyen de têtes abrasives tournantes

Country Status (5)

Country Link
EP (1) EP3107687B1 (fr)
CN (1) CN106170369B (fr)
BR (1) BR112016018894B1 (fr)
ES (1) ES2676081T3 (fr)
WO (1) WO2015124990A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107088829B (zh) * 2017-05-16 2023-08-08 张家港市宇安精密机械有限公司 套筒研磨夹具
CN111386175A (zh) * 2018-03-04 2020-07-07 奥斯本股份有限公司 具有工具安装适配器的旋转表面修整器具
CN110587476A (zh) * 2019-10-17 2019-12-20 福州亿发智能科技有限公司 一种双浮动磨头及卡接装置
IT202000009079A1 (it) 2020-04-27 2021-10-27 Pedrini Spa Ad Unico Socio Mandrino perfezionato per teste rotanti di calibratura o levigatura di materiali planari artificiali o naturali
CN112454094B (zh) * 2020-11-18 2021-10-26 山东艾泰克环保科技股份有限公司 一种车载转向油缸表面去毛刺设备
CN114952701B (zh) * 2021-02-18 2024-03-29 中国航发商用航空发动机有限责任公司 拆装工装以及拆装方法
CN113118914B (zh) * 2021-04-19 2022-12-06 营口鑫昌模塑科技有限公司 一种增强pe塑料桶生产加工机械及加工方法
CN113997141B (zh) * 2021-09-29 2023-06-06 中国水利水电第六工程局有限公司 座环打磨装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6719505B2 (en) * 1999-09-01 2004-04-13 Novator Ab Orbital hand tool apparatus for drilling
ITMO20020135A1 (it) * 2002-05-20 2003-11-20 Luigi Pedrini Mandrino intrinsecamente equilibrato portante teste di calibratura, levigatura o lucidatura di materiali lapidei naturali e piastrelle ceram
EP2136962B1 (fr) * 2007-04-18 2010-10-20 National Oilwell Varco, L.P. Procédé et systèmes d'entraînement de broche à long déport
ITUD20070163A1 (it) * 2007-09-10 2009-03-11 Danieli Off Mecc Macchina pelatrice per barre, tubi, o simili prodotti oblunghi
DE102011014230A1 (de) * 2011-03-17 2012-09-20 Satisloh Ag Vorrichtung zur Feinbearbeitung von optisch wirksamen Flächen an insbesondere Brillengläsern

Also Published As

Publication number Publication date
CN106170369B (zh) 2018-11-13
CN106170369A (zh) 2016-11-30
EP3107687B1 (fr) 2018-04-11
BR112016018894B1 (pt) 2021-02-23
WO2015124990A1 (fr) 2015-08-27
ES2676081T3 (es) 2018-07-16

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