EP1011920A1 - Ensemble de meulage - Google Patents

Ensemble de meulage

Info

Publication number
EP1011920A1
EP1011920A1 EP98916867A EP98916867A EP1011920A1 EP 1011920 A1 EP1011920 A1 EP 1011920A1 EP 98916867 A EP98916867 A EP 98916867A EP 98916867 A EP98916867 A EP 98916867A EP 1011920 A1 EP1011920 A1 EP 1011920A1
Authority
EP
European Patent Office
Prior art keywords
grinding
machine
disc
unit according
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98916867A
Other languages
German (de)
English (en)
Inventor
Benny Pedersen
Finn Pedersen
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.)
Smedefirmaet Boka AS
Original Assignee
Smedefirmaet Boka AS
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 Smedefirmaet Boka AS filed Critical Smedefirmaet Boka AS
Publication of EP1011920A1 publication Critical patent/EP1011920A1/fr
Withdrawn legal-status Critical Current

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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/18—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like
    • B24B7/186—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like with disc-type tools
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
    • 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
    • B24B55/03—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant designed as a complete equipment for feeding or clarifying coolant
    • 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

Definitions

  • the invention concerns a grinding unit for grinding e.g. stone floors, and comprises a guidable control grinding machine with a grinding disc bearing on the floor with the grinding bodies of the machine during operation, a motor for rotating the grinding disc, and a cover plate located above the grinding disc, the cover plate is firmly connected to partly the motor and partly a manually operated handle for controlling the grinding machine.
  • Stone floors are conventionally ground by means of merely one guidable grinding machine.
  • the operator is able to guide the machine in a desired direction by, with the handle, overlaying the net weight of the machine with a moment. Thereby, the angle between the axis of rotation of the grinding disc and the resultant of the pressure of the machine on the floor is altered so that the grinding disc will act as a kind of driving wheel for pulling the machine across the floor.
  • the grinding disc of the machine is quite simply composed of merely a single stiff disc on which are mounted for example grinding bodies based on diamond or carborundum.
  • the size of the grinding discs which can be used is limited by the stiffness. If the grinding discs are too big, they cannot follow unevennesses in the floor very well. However, stones of stone floors are often lying very unevenly, and large quantities of material must usually be ground off in order to get to grind the underlying areas of the floor as well which is necessary in order to give the finished floor the wanted uniform finish. Only grinding discs with relatively small diameters, for example between 350 mm and 430 mm, can therefore be used for this type of grinding machines.
  • the stiffness of the grinding discs furthermore put a limit for the rotational speeds which can be used without damaging the grinding bodies to between 150 and 400 rpm.
  • the object of the invention is to provide a grinding unit of the kind mentioned in the opening paragraph which has a much higher productive capacity than known per se .
  • the grinding unit also comprises a number of handleless attached grinding machines which are mainly constructed in the same way as the control grinding machine and directly or indirectly are coupled to this whereby the capacity of the unit is increased proportionate to the number of attached grinding machines.
  • the productive capacity can be further increased by constructing each grinding disc of the grinding machine of an upper stiff disc connected to the output shaft of the motor, and a lower stiff disc for monting the grinding bodies of the machine, and an elastomeric intermediate disc for interconnecting the two stiff discs.
  • the intermediate disc which for example can be made of foam rubber, now allows the lower disc with the grinding bodies to flexibly follow unevennesses in the floor. It is therefore not necessary to grind large quantities of stone off the floor, as is the case with conventional machines, in order to give it a nice, uniform appereance. Thereby, the grinding time per grinding machine can be reduced by more than half compared to earlier when grinding uneven and badly laid floors.
  • the elastomeric intermediate disc furthermore has the effect of further reducing the grinding time per grinding machine as the flexibility of the intermediate disc permits increasing the rotational speed of the grinding discs to for example 800 rpm and the diameter of the grinding discs to about 500 mm without affecting the durability of the grinding bodies.
  • diamonds can furthermore be used for the grinding bodies with advantage.
  • the grit size of the diamonds can variate between finenesses of between 30 and 20.000. In the latter case, the floor will get a mirror-like finish. If a normal, good standard quality of the surface of the ground floor is wanted, diamonds of a fineness of up to 3,500 are used.
  • the different parts of the grinding discs for example the grinding bodies are subjected to a not negligible wear during the working process.
  • the mentioned parts can advantageously be assembled by bur-like assembling means of the kind which consists of two pieces of cloth with bur-like hooks on opposite sides for releasably interengaging when mounted.
  • bur-like assembling means of the kind which consists of two pieces of cloth with bur-like hooks on opposite sides for releasably interengaging when mounted.
  • the sucking away of the excess water can for certain be effectively done by placing a hanging skirt along the periphery of each cover plate.
  • the bottom part of this skirt can advantageously be made of an elastomer, such as rubber, so that the skirt is able to follow unevennesses in the floor.
  • the skirt keeps the grinding water within the immediate working area of the grinding discs, and excess water with suspended slip can therefore easily and effectively be sucked away via an opening made in the skirt and connected to a suction hose which in its turn is connected to the suction device .
  • the suction device comprises a water tank with a motor-driven ventilator placed above the water tank and serving for creating a negative pressure for via the suction hose sucking the excess water into the tank .
  • a centrifuge can be placed in the tank above the water surface, the sucked grinding water with suspended slip is made to pass this centrifuge before it, in filtered condition, runs into the tank reservoir.
  • the slip in the form of sludge is held back by the centrifuge where furthermore a filterbag advantageously can be placed for collecting the sludge which therefore easily and quickly can be removed merely by removing the filterbag.
  • the filtered water in the tank can be recirculated to the grinding discs by means of a pump.
  • the above-described grinding water system is not only extremely labour-saving, but also profitable economically due to the saving of considerable quantities of expensive, fresh water, and because the grinding water essentially is recycled instead of being discharged into the public sewer system in a very polluted condition.
  • adjacent grinding machines can be coupled by couplings which allow mutual vertical motion and angular displacement between the planes of the grinding discs.
  • Each of the machines of the grinding unit can thereby follow unevennesses of the floor at the same time as the whole grinding unit is led mainly translatory across the floor as one concerted grinding unit.
  • the couplings can actually be of any kind as long as they allow the above-mentioned mutual vertical motions and angular displacements between the planes of the grinding discs.
  • a simple and effective coupling which at the same time has an damping effect on the motion of the various grinding machines, can according to the invention consist of a vertically set spiral spring, the turnings of which are partially attached to a likewise vertically set bracket on each of the cover plates of two adjacent grinding machines.
  • This type of coupling is easiest to arrange when the cover plates have a polygonal contour and it is especially advantageous when the contour is hexagonal.
  • the handle is only on the control machine.
  • guiding takes place by, with the handle, impressing the control machine a moment with a direction determining which direction the entire grinding unit is to follow.
  • the moment will tilt the control machine in relation to the attached grinding machines, and this tilting is precisely possible because of the advantageous arrangement of the couplings which permit vertical intermotion and angular displacement between the planes of the grinding discs.
  • Fig. 1 is a schematic view of a single guidable control grinding machine which is led across a floor by an operator
  • Fig. 2 is a side view, partially in section, of the grinding machine shown in fig. 1 comprising an upper cover plate and a lower grinding disc made up of various parts,
  • Fig. 3 is the same seen from below,
  • Fig. 4 is a schematic view of a grinding unit comprised of the control grinding machine shown in fig. 1 - 3 now coupled to two attached grinding machines
  • Fig. 5 is a schematic view of a second grinding unit comprised of the control grinding machine shown in fig. 1 - 3 coupled to four attached grinding machines
  • Fig. 6 is a schematic view of a third grinding unit comprised of the control grinding machine shown in fig. 1 - 3 coupled to four attached grinding machines as the one in fig. 5, but in another grouping,
  • Fig. 7 shows a fourth grinding unit which corresponds to the one shown in fig. 6, but with hexagonal cover plates over the grinding discs.
  • Fig. 8 is a top view of a coupling for coupling the cover plates, which are only fragmentarily shown in the figure, of two adjacent grinding machines,
  • Fig. 9 is the same, seen from the side,
  • Fig. 10 is a schematic view and in perspective of the grinding unit shown in fig. 5 and a device for successively removing excess grinding water with suspended slip from the grinding process, and
  • Fig. 11 shows a water tank with a motor-driven ventilator for via a suction hose successively sucking off the excess water from the grinding process, a centrifuge placed in the tank for separating the grinding sludge from the sucked water, and a submersible pump likewise placed in the tank for pumping the cleaned water back to be reused in the grinding process.
  • the handle 4 is pivotally mounted on a horizontal swing bed 5 on the grinding machine so that the operator can easily adjust the handle to a working position which suits his height and build.
  • This adjustment is done by means of an adjusting rod 6 pivotally mounted on the grinding machine and an adjusting plate 7 fixed to the handle 4 and provided with a slit 8 extending in the longitudinal direction of the handle.
  • the adjusting rod 6 forms an angle with the handle 4.
  • a clamp bolt 9 driven through the slit 8 serves for, by means of a lever 10, clamping the adjusting rod 6 with the adjusting plate 7 and thereby with the handle 4.
  • the operator loosens the clamp bolt and places the handle at an desired inclination, hereby slidingly displacing the clamp bolt in the slit.
  • the clamp bolt is then tightened with the lever 10 after which the handle is tightly and firmly connected to the grinding machine .
  • the operator can now control the machine by, with the handle, tilting the grinding machine in a given direction.
  • the friction of the grinding disc will be biggest on the spot where the machine subsequently is resting the heaviest against the floor, and the grinding disc will therefore act as a driving wheel for pulling the machine across the floor in the wanted direction.
  • the guidable grinding machine shown in fig. 1 could be a conventional grinding machine. However in the following description, it is assumed that the grinding machine is a control grinding machine according to the invention shown separately without attached grinding machines attached to it.
  • the control grinding machine and the attached grinding machines are mainly constructed in the same way. Their construction will appear in more detail from fig. 2 and 3 which shows the control grinding machine shown in fig. 1.
  • the grinding machine is driven by a motor 12 with a output shaft 13.
  • the motor is, by means of a flange 14, fixed to a cover plate 15 which i.a. serves for protecting the operator and other persons near by from coming into contact with the underlying grinding disc 16 which, during operation, rotates at a dangerously high speed, e.g. 800 rpm.
  • the grinding disc 16 consists of an upper stiff disc 17 connected to the output shaft 13 of the motor 12, a lower stiff disc 18 for mounting the grinding bodies 19 of the machine, and an elastomeric intermediate disc 20 for interconnecting the two stiff discs 17, 18.
  • the various parts 17, 18, 20, 22 of the grinding disc 16 are mutual assembled by means of bur-like pieces of cloth 19 which in pairs work together for releasably assembling the two mentioned parts.
  • One side of a pair of pieces of cloth is stuck to each of the two parts which are to be assembled.
  • each of the two pieces of cloth have a large number of bur-like hooks for releasably interengaging with corresponding hooks on the other piece of cloth.
  • the grinding disc 16 is subjected to great stress in the form of i.a. bumps, impacts, and vibrations which, in deference to the durability of the grinding bodies, set narrow limits to how high a grinding speeds there can be used when conventional stiff grinding discs are used.
  • the elastomeric intermediate disc 20 is typically made of foam rubber of a thickness of e.g. 10 mm.
  • the intermediate disc can advantageously be made of several layers of foam rubber releasably assembled by the bur-like cloth pieces 19.
  • the foam rubber damps the vibrations and absorbs yieldingly bumps and impacts which might affect the grinding disc during operation.
  • the grinding disc can therefore work at far greater rotational speeds and with bigger diametres than known per se, for example at 800 rpm and with diametres of e.g. 500 mm without affecting the durability of the grinding bodies. Thereby, a substantial increase in the capacity of the grinding machine is obtained.
  • Diamonds are principally used as abrasive, these are set in grinding points 21 on the grinding bodies 22 which, in the shown case, are in the form of grinding segments 22. Diamonds are best at the above-mentioned high grinding speeds. Within the scope of the invention, other kinds of abrasives can however also be used, for example carborundum.
  • a hanging skirt 23 is furthermore fitted along the peripheri of the cover plate, the skirt consists of an upper stiff ring 24 of e.g. iron and a lower elastomeric rubber ring 25 extending down to the floor.
  • the skirt consists of an upper stiff ring 24 of e.g. iron and a lower elastomeric rubber ring 25 extending down to the floor. The significance and purpose of this skirt will be explained later.
  • control machine 1 is coupled with two attached machines 26 which are contra-rotating so that they jointly do not influence the entire grinding unit with any further torque than the torque of the control machine 1 itself which is absorbed by the operator.
  • the operator can consequently control all three machines at the same time as easily as if there only were the control machine. As can be seen, the grinding capacity has been trebled.
  • the attached machines 26 can be grouped in different ways around the control machine 1.
  • Fig. 6 thus shows an arrangement with two pairs of attached machines 26 attached to the control machine 1 just as the one shown in fig. 5, but grouped differently. In this case, the capacity has naturally also been quintupled. The main difference is that the unit is narrower than the one shown in fig. 5.
  • the narrow unit shown in fig. 6 can advantageously be used. If there is enough room, it will in many cases be profitable to use the wide unit shown in fig. 5 which can grind a wide track at once.
  • both the control machine and the attached machines all have mounting holes 28 for couplings 27. Thereby, a flexibility is obtained which allows for quick rearrangement from one type of grouping to another, and also for choosing the type of grouping most suited for the case in point.
  • the arrangement shown in fig. 7 corresponds quite to the one shown in fig. 6, the only difference being that the cover plates 29 are hexagonal with sides 30 presenting advantageously good possibilities for placing the mounting holes 28 with e.g. two holes along each of the sides of the hexagon.
  • the hexagonal cover plates 29 furthermore gives the grinding unit a top side which makes it appear as a whole.
  • the grinding unit was built of 3 and 5 grinding machines respectively, i.e. an uneven number which is necessary if the attached grinding machines in pairs are to cancel out each others moments.
  • the number of grinding machines can easily be increased to for example 7 or 9, whereby a corresponding increase in the grinding capacity is obtained.
  • the control machine and the attached machine When the grinding unit is in operation, the control machine and the attached machine must be able to be led translatoric across the floor in one body.
  • the floors are normally not even but on the contrary usually quite uneven.
  • the individual machines As the grinding unit exactly covers a relatively large floor space, the individual machines must separately be able to follow the unevennesses of the floor, and each grinding machine must therefore be able to change angle and/or be displaced vertically in relation to the adjacent machines.
  • Fig. 8 and 9 show a coupling which allows such intermotion.
  • the main part of the coupling is a vertical set spiral spring 31 with windings 32 which along half of the spring turns in one direction and along the other half turns in the other direction so that the spring is torsion neutral.
  • each bracket 35 consists of a square pipe 36 on which is welded an angle 37.
  • the square pipes 36 are fixed in corresponding square mounting holes 28 in the cover plate 15 and can therefore not turn in relation to this.
  • the two sides of the mounting holes 28 are parallel to the sides 30 of the hexagonal cover plates 29.
  • the geometry fits such that square pipes can be used without angle irons as brackets.
  • the spiral springs 31 which do not constitute a rigid, stiff connection but on the contrary a flexible connection which allows adjacent machines to alter angle and/or be vertically displaced in relation to each other which is necessary on the usually uneven floors which are to be ground.
  • the springs soften any vibrations which might be generated during the grinding process.
  • screw coupling only is an example. Within the scope of the invention, many other types of couplings with correspondingly flexible and softening properties can be used.
  • a stone floor is a hard process which require admission of grinding water. From e.g. a tap, the water is added to an area near the grinding disc inside the skirt 23 shown in fig. 2 and 3.
  • This suction device 38 is shown schematically in perspective in fig. 10 where it serves five grinding machines grouped as shown in fig. 5.
  • the suction device 38 comprises a container 43 which, via a vacuum hose 44, is connected to, in this case, two vacuum pumps 45.
  • the vacuum pumps When the vacuum pumps are in operation, the excess water with suspended slip is sucked into the container 43 where it is collected.
  • the collected water and sludge is pumped by means of a submersible pump 46 via a pipe 47 to a waste pipe which for example is connected to the public sewer system.
  • Large quantities of water are used for the grinding of a floor and because of the high water prices, this will then represent a considerable part of the total costs for the grinding process.
  • the suction arrangement shown in fig. 10 the used water with its content of sludge is discharged into the sewer system thereby polluting it.
  • Fig. 11 shows a second suction device 48 which is arranged in such a way that the sucked water or a considerable part of the water can be recycled and re-enter into the grinding process.
  • This variant comprises a container 49 with a detachable lid 50. On the lid, there is mounted a relatively high-speed motor 51 with an output shaft 52 on which is mounted an axial-flow ventilator 53 for generating a negative pressure in the container 49. By means of this negative pressure, excess water with suspended slip is sucked into the container at the top of this via a suction hose 54.
  • the centrifuge separates the sludge from the water which, via holes 56 in the wall of the centrifuge, drains off into a water reservoir 57 at the bottom of the container 49.
  • the sludge can be very fine-grained. Therefore, a filterbag 58 is placed in the centrifuge for filtering off and collecting the sludge. Thereby, an advantage is obtained in that the sludge quickly and easily can be removed merely by taking the filterbag with its content of sludge out of the centrifuge.
  • control grinding machine can pair with an attached grinding machine which is rotating in the opposite direction than the control grinding machine and counterbalance its torque. In this case, the operator is not loaded with any torque from the grinding unit.
  • 1 - 2 m 2 floor can typically be ground per hour.
  • a grinding unit according to the invention there can, with for example seven coupled grinding machines, be ground up to 40 m 2 per hour.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Ensemble de meulage servant à meuler, par exemple, des sols en pierre (2). Cet ensemble de meulage est composé d'une machine à meuler (1) à commande pouvant être guidée et pourvue d'un disque abrasif portant sur le sol avec les éléments de meulage de la machine pendant son fonctionnement, d'un moteur (12) servant à faire tourner le disque abrasif et d'un couvercle monté au-dessus du disque abrasif et solidement accouplé au moteur, d'une part, et, d'autre part, à un manche (4) mis en service à la main afin de commander la machine à meuler. Cet ensemble de meulage comprend, de plus, plusieurs machines à meuler (26) fixées sans manche et conçues pratiquement de la même façon que la machine de commande et accouplées à cette dernière directement ou indirectement. Cet ensemble permet de réaliser une productivité bien supérieure à celle de l'état actuel de la technique.
EP98916867A 1997-04-22 1998-04-21 Ensemble de meulage Withdrawn EP1011920A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK45697 1997-04-22
DK45697 1997-04-22
PCT/DK1998/000161 WO1998047659A1 (fr) 1997-04-22 1998-04-21 Ensemble de meulage

Publications (1)

Publication Number Publication Date
EP1011920A1 true EP1011920A1 (fr) 2000-06-28

Family

ID=8093768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98916867A Withdrawn EP1011920A1 (fr) 1997-04-22 1998-04-21 Ensemble de meulage

Country Status (3)

Country Link
EP (1) EP1011920A1 (fr)
AU (1) AU7030498A (fr)
WO (1) WO1998047659A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2222417C1 (ru) * 2002-10-16 2004-01-27 Чернов Олег Анатольевич Универсальная плоскошлифовальная машина
ITGE20100125A1 (it) * 2010-11-12 2012-05-13 Andrea Teri Dispositivo per la levigatura e lucidatura di superfici in marmo, granito, similari in pietra, legno, metalliche ed altre a nome di teri andrea
SE535278C2 (sv) * 2010-12-10 2012-06-12 Jan Urban Thysell Anordning för slipning varvid anordningen är mobil och bland annat innefattar en fritt roterande planetskiva och via elmotorer roterbart förbundna sliprondeller
CN109746798A (zh) * 2019-01-28 2019-05-14 揭阳市合升机械石材有限公司 一种智能石材连续抛光机
CN116810525A (zh) * 2022-12-06 2023-09-29 张群 一种污水循环式地面水磨研磨机器人及其使用方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE546019C (de) * 1930-10-30 1932-03-08 Inventia Patent Verwert Ges Mehrscheibenbohner mit Reibradantrieb
US3398490A (en) * 1966-06-28 1968-08-27 William H. Redifer Floor sanding machine with controllable motion
DE3637450A1 (de) * 1986-11-04 1988-05-05 Erich Salzinger Kupplungsteil zur kupplung/verbindung von feinschleifmaschinen mit fussbodenschleifmaschinen aller art
GB8818478D0 (en) * 1988-08-03 1988-09-07 B A Power Tool Ltd Grinding machine
SE504749C2 (sv) * 1996-02-16 1997-04-14 Pierre Jonsson Förfarande och anordning för våtslipning av ett golv

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9847659A1 *

Also Published As

Publication number Publication date
WO1998047659A1 (fr) 1998-10-29
AU7030498A (en) 1998-11-13

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