EP0506770B1 - Method and device for cleaving laminated mineral blocks - Google Patents

Method and device for cleaving laminated mineral blocks Download PDF

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Publication number
EP0506770B1
EP0506770B1 EP91901467A EP91901467A EP0506770B1 EP 0506770 B1 EP0506770 B1 EP 0506770B1 EP 91901467 A EP91901467 A EP 91901467A EP 91901467 A EP91901467 A EP 91901467A EP 0506770 B1 EP0506770 B1 EP 0506770B1
Authority
EP
European Patent Office
Prior art keywords
laminæ
fluid
block
mineral
mineral block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91901467A
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German (de)
English (en)
French (fr)
Other versions
EP0506770A1 (en
Inventor
Bo Mellgren
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.)
Skifferbolaget Jacobsson & Oscarsson AB
Original Assignee
Skifferbolaget Jacobsson & Oscarsson AB
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 Skifferbolaget Jacobsson & Oscarsson AB filed Critical Skifferbolaget Jacobsson & Oscarsson AB
Publication of EP0506770A1 publication Critical patent/EP0506770A1/en
Application granted granted Critical
Publication of EP0506770B1 publication Critical patent/EP0506770B1/en
Anticipated expiration legal-status Critical
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28DWORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/32Methods and apparatus specially adapted for working materials which can easily be split, e.g. mica, slate, schist
    • B28D1/322Splitting of the working materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28DWORKING STONE OR STONE-LIKE MATERIALS
    • B28D7/00Accessories specially adapted for use with machines or devices of the preceding groups
    • B28D7/04Accessories specially adapted for use with machines or devices of the preceding groups for supporting or holding work or conveying or discharging work

Definitions

  • the present invention relates to a method for cleaving laminated mineral blocks along an interface between two lamin ⁇ and a device for carrying out the method according to the preambles of the appended claims 1 and 7.
  • the definition laminated mineral blocks comprises all types of solid minerals composed by a number of lamin ⁇ or layers. These have been created in the course of the ages in the earth's crust and may be exploited therefrom for different purposes, for instance within the building field.
  • the invention relates more particularly, but accordingly not solely, to cleaving of mineral blocks consisting of slate, especially mica slate and clay slate.
  • the invention will hereinafter by way of example be described in connection with cleaving of mica slate so as to throw light upon the different problems of the present technique of cleaving mineral blocks along an interface between two lamin ⁇ .
  • Mica slate is mined as large blocks, in general in open cut mine, and these blocks are given a size and form being easy to handle by means of for example sawing.
  • the mineral blocks of mica slate are composed by superposed material lamin ⁇ substantially parallel to each other.
  • the mica slate is very hard, but it may be cleaved along the interfaces between two lamin ⁇ while generating surfaces being very attractive to the eye. By doing so a surface with small waves is obtained, which is very decorative and gives rise to different kinds of reflexes and visual perceptions in dependence on the light inciding thereon and at which angle the slate surface is observed. This surface is in every day parlance called cleft surface.
  • a mode of procedure for obtaining such a so called cleft surface has been the following: by means of swinging a sledge or hammer by hand power several metal wedges have been driven at mutual distances into the region between two lamin ⁇ and in a direction substantially parallel thereto.
  • the laminated mineral block has an expressed tendency to be cleft along the interfaces between the two lamin ⁇ , the driving of the wedges inwardly generates a crack propagating between the two lamin ⁇ in question and finally completely separating the two lamin ⁇ , so that two material pieces with one desired cleft surface each have been created.
  • a so called cleavage has been carried out.
  • driven striking tools having wedges for cleaving slate blocks is also known, but it has turned out that these increase the risk of the last mentioned ruptures even more, since the driven striking tools may not be handled with the balancing of forces and the feeling possible when hitting wedges by man power.
  • a device and a method of the kind mentioned in the introduction are known through GB-A-1 377 597, which describes a device for cleaving slate shale by supplying fluid under pressure to an incipient crack located between two adjacent lamin ⁇ of a slate shale.
  • a block of material is located in an enclosure, which has peripheral seals adapted to produce fluid tightness between the enclosure and the external surroundings, so that a slight vacuum may be obtained around the block so as to make the cleaving forces more efficient.
  • porous foam of a very low density is placed in direct contact with the block to be cleft inside said enclosure, so as to reduce the leakages which will exist as soon as the fissure front created by the fluid under pressure has reached one of the edges of the block to be cleft so that the lateral fluid flow in the fissure between the two lamin ⁇ may be reduced. It is indicated that the propagation of the fluid under pressure has to be rapid. In order to achieve this, it is necessary that comparatively high pressures are used when applying the fluid under pressure so as to obtain the cleaving, and it his here in the practise a question of a cutting and not a pressing of two adjacent lamin ⁇ apart.
  • DE-A-906 072 describes a method for separating laminated mineral blocks by means of fluid under pressure.
  • the method is used only for cleaving mineral blocks to be used substantially for fulfilling a specific function and not primarily for the sake of the appearance thereof, and it is necessary to use that high pressures for the fluid under pressure to obtain the cleaving that the beautiful natural so called cleft surfaces desired will not be obtainable, but these surfaces will be damaged by the cutting action of the fluid under pressure.
  • the features of the characterizing part of the new claim 1 makes it possible to apply the fluid under pressure for cleaving a laminated mineral block along an interface between two lamin ⁇ with such a low pressure that beautiful natural so called cleft surfaces desired will be obtained, since the fluid having a low pressure may thanks to the sealing along the outer delimiting walls of the mineral block at the level of the transition between the two lamin ⁇ manage to propagate between the lamin ⁇ and press them apart, so that the pressing forces are attacking the two lamin ⁇ very close to the propagation front of the crack so created.
  • the device according claim 7 may be used to cleave laminated mineral blocks along an interface between two lamin ⁇ while obtaining the object of the present invention. This is accomplished by the fact that elements of substantially planar material pieces and substantially impermeable to the fluid under pressure are arranged to seal the mineral block along its outer delimiting walls at the level of the transition between the two lamin ⁇ , the provision of a power apparatus arranged to press the planar material pieces to bearing against the two lamin ⁇ on each side of the transition therebetween along at least the main part of the delimiting walls of the mineral block, the material piece adapted for bearing in the region of the place for the feed of fluid has an aperture, the feeding means comprises a fluid conduit arranged to emerge into the aperture, and the portions of the material piece surrounding the aperture are arranged to be sealingly connected to the periphery of the fluid conduit.
  • the method according to claim 1 may be carried out in an efficient way by using this device, so that it will be possible to use low pressures for the fluid under pressure and by that not damaging the cleft surfaces obtained by cleaving laminated mineral blocks, thanks to the sealing action of said planar material pieces and the way these are applied to the laminated mineral block in question.
  • incipient cracks may be omitted and any waste of material as a result of wedge marks may be completely eliminated.
  • the cleaving according to the invention takes place by pressing two lamin ⁇ apart and not by cutting in a plane parallel to these lamin ⁇ .
  • Such a cutting which could be realized mecanically, for instance by sawing, or by feeding a fluid under a very high pressure, as in GB-A-1 377 597 and DE-A-906 072, would not result in the beautiful cleft surfaces with small waves desired.
  • the fluid consists advantageously of water and it is possible to feed water under a surprisingly low pressure, for instance about 2 bars, and still obtain a cleaving, since the water seeks its way through the mineral block while pressing the two lamin ⁇ apart.
  • a low pressure for instance about 2 bars
  • Fig 1 it is schematically shown how a mica slate block is cleft or split into scales.
  • the slate block 1 is usually sawn in a direction substantially perpendicular to the extension of the different lamin ⁇ , so that it gets substantially even delimiting walls.
  • the thickness of such a block 1 is normally about 30 cm and such a block includes a great number of lamin ⁇ , for instance about 50.
  • Slate scales with a thickness of about 10-40 mm are usually demanded, so that scales consisting of several lamin ⁇ are to be cleft out of the slate block.
  • only the interfaces along wich it has to be cleft are indicated.
  • the device has a bed 5, which is constituted by mutually spaced rolls 6, which are arranged to support a mineral block 1 to be cleft along the interface between two lamin ⁇ .
  • the bed 5 is supported through power means 7, in the form of hydraulic cylinders, by a stand 8 resting on the ground.
  • the bed may be lifted and lowered by prolongation and shortering, respectively, of the hydraulic cylinders 7.
  • the device comprises a frame work 9, and on this a second power means 10, also in the form of a hydraulic cylinder, is arranged to act between the frame work 9 and a pressure plate 11 arranged at one end of the power means so as to press the plate 11 against the upper side of the mineral block 1 and thereby clamp and fix the block between the pressure plate 11 and the rolls 6 of the bed 5.
  • the mineral block 1 may in this way be hold in a substantially fixed position during the cleaving process.
  • the power means 10 preferably allows a slight movement, of some mm, of the mineral block in the vertical direction by pressing the pressure plate 11 back during the penetration of the fluid in the mineral block 1 and thereby a slight coming apart of the material block portions located on each side of the cleaving surface in question.
  • Two rulers 12 in the form of square beams extending substantially parallel to each other in a horizontal plane are movably arranged on the frame work 9 in the directions towards and away from each other. However, these rulers 12 are not movable in the vertical direction.
  • the movements of the rulers are achieved by third power means 13 acting between the frame work 9 and the ruler in question, and these means are also in the form of hydraulic cylinders.
  • the third power means 13 are preferably commanded in common by one single command.
  • a sealing element in the form of a rubber strip 14 is secured to the surface of each ruler facing the other ruler, i.e. the mineral block 1 (see in particular Fig 4).
  • the rubber strip 14 has here the same width as the ruler 12 in question, but it could be considerably narrower, should a very straight crack propagation be expected, since it is only necessary that it bears on each side of the crack formed. It would be possible to reduce the bearing pressure of the power means 13 if the strip were more narrow.
  • the device has also a plate 15 arranged to be pressed against a delimiting wall of the mineral block being substantially perpendicular to the extension of the rulers.
  • a fourth power means 16 in the form of a hydraulic cylinder is for this reason arranged to act between a part 18 securable through stretching screws 17 with respect to the rest of the frame work and the plate 15.
  • the surface of the plate 15 turned towards the mineral block 1 is provided with a nozzle 19 (see also Fig 4), which consists of a rubber strip 20 extending substantially horizontally and having an aperture.
  • a conduit for fluid under pressure in the form of a water hose 22 is led through the plate 15 and to the aperture 21 of the nozzle 19.
  • the end of the hose is indicated in Fig 3.
  • the assembly for feeding water through the conduit 22 is not shown in the Figures, and this may be constructed in an arbitrary way known per se.
  • the rubber strip 20 is arranged to extend along the entire width of the mineral block all the way to the rubber strips of the two rulers, so that the rubber strips 14 and 20 are able to, except for the opening 21, form a water tight delimiting of the mineral block 1 along three delimiting walls of the mineral block over a surface vertically corresponding to the width of the strips. It may be assured that the rubber strips 14 are tightly connected to the rubber strip 20 by adjustment of the stretching screws 17. It is shown in Fig 4 how a plate 15 with the strip 20 is inserted between the rulers 12, but the rulers 12 could be arranged not to project beyond the end edge of the block and the length of the strip 20 may be increased to an appropriate extent so as to adapt the device to mineral blocks with different widths.
  • a mineral block to be cleft along the interface between two lamin ⁇ may be at several places so as to split the mineral block into several scales, is firstly cut so that it gets even lateral delimiting walls, in the way shown in Fig 2.
  • This block is then laid down on the bed formed by the rolls 6 and the second power means 10 is actuated to fix the mineral block with respect to the bed 5.
  • the power means 7 are after that actuated so that the bed 5 is vertically moved with respect to the rulers provided with the rubber strips 14 and the nozzle 19.
  • This movement takes place to a position in which a first interface along which is to be cleft lies in a horizontal plane approximately in the middle between the upper and lower edge of the rubber strips 14.
  • the third power means 13 are actuated to bring the rulers 12 towards each other, so that the rubber strips 14 will sealingly bear against the two lamin ⁇ of the mineral block on each side of the transition therebetween.
  • the fourth power means 16 is after that actuated to press the nozzle 19 into sealing bearing against the mineral block on each side of the same lamin ⁇ transition. It is possible to provide the mineral block with a small incipient crack 24 at the place intended to be located just opposite to the aperture 21 of the nozzle.
  • Such incipient cracks 24 are illustrated in Fig 3 and assist in initiating the cleaving crack aimed at. All the lamin ⁇ of the upper scale to be cleft away from the mineral block are shown in this Figure, while for the rest only the boundary layer surfaces along which it is to be cleft are indicated. Water under a comparatively low pressure (experiments have shown that pressures of below 2 bars are sufficient in some cases) is after that fed to the aperture 21. However, higher pressures, such as about 10 bars, may be required for initiating the crack formation. The water penetrates into the incipient crack 24 and is by the rubber strips 20 and 14 prevented from escaping from the mineral block.
  • the water will as a consequence thereof exert forces in the direction substantially perpendicular to the planes of the two lamin ⁇ and gradually press the two lamin ⁇ apart on the propagation of a crack quickly filled by water in the direction towards the end 25 of the mineral block 1 located opposite to the aperture 21. How this takes place is shown in Fig 5. Accordingly, the lever arms will during this pressing apart be very short, since the water continuously fills the crack formed and exerts forces for pressing apart in the region of the crack front existing in every moment. The risk of accidental ruptures is therefor very small. Thanks to the short lever arms it is also possible to cleave the mineral block at a desired place, i.e. also so that the mineral block parts located on each side of the crack formed have considerably different thicknesses.
  • the water supply to the nozzle 19 is interrupted and the power means 16 and 13 are actuated to move the sealing strips away from the mineral block 1, when said crack has propagated along the entire interfacing in question and the cleaving thus has been completed.
  • the power means 7 is after that actuated to move the bed 5 and thereby the mineral block in the vertical direction to a position suitable for carrying out the next cleaving, whereupon the working moments described above are repeated for the realization thereof. It may in this way be started for instance 30 mm from the upper side of the mineral block with a cleavage along the interface between two lamin ⁇ and the mineral block may thereafter be gradually moved upwardly while cleaving thin scales from the lower part of the mineral block until the block consists solely of such thin scales.
  • the block to be cleft by means of the device could of course appear in totally different forms than the one shown in the Figures, and the device will then get the corresponding modifications.
  • the material block has smooth delimiting walls, but this is not completely necessary, but it would also be conceivable to arrange any other type of sealing elements, e.g. any kind of sealing paste sprayable onto and along the mineral block.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Laminated Bodies (AREA)
  • Shovels (AREA)
  • Dicing (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Fish Paste Products (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Processing Of Solid Wastes (AREA)
  • Disintegrating Or Milling (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP91901467A 1989-12-22 1990-12-19 Method and device for cleaving laminated mineral blocks Expired - Lifetime EP0506770B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE8904342 1989-12-22
SE8904342A SE464068B (sv) 1989-12-22 1989-12-22 Foerfarande foer klyvning av skiktade mineralstycken och anordning foer genomfoerande av foerfarandet
PCT/SE1990/000849 WO1991009715A1 (en) 1989-12-22 1990-12-19 Method for cleaving laminated mineral blocks, device for carrying out the method and a product produced by means of the method

Publications (2)

Publication Number Publication Date
EP0506770A1 EP0506770A1 (en) 1992-10-07
EP0506770B1 true EP0506770B1 (en) 1995-09-27

Family

ID=20377855

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901467A Expired - Lifetime EP0506770B1 (en) 1989-12-22 1990-12-19 Method and device for cleaving laminated mineral blocks

Country Status (10)

Country Link
EP (1) EP0506770B1 (sv)
AT (1) ATE128400T1 (sv)
AU (1) AU6974391A (sv)
BR (1) BR9007944A (sv)
DE (1) DE69022741T2 (sv)
ES (1) ES2080292T3 (sv)
NO (1) NO180369C (sv)
PT (1) PT96309B (sv)
SE (1) SE464068B (sv)
WO (1) WO1991009715A1 (sv)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9112555D0 (en) * 1991-06-11 1991-07-31 Burlington Slate Limited Method of and apparatus for the splitting of slabs and blocks
FR2790417B1 (fr) * 1999-03-05 2001-04-13 Sovemine Ingenierie Procede et installation de refente de blocs de schiste ardoisier
DE10019726C2 (de) * 2000-04-20 2002-08-29 Dorstener Maschf Ag Verfahren und Trennvorrichtung zum Trennen einzelner Porenbetonkörper eines entlang von Trennflächen geschnittenen Porenbetonkuchens
FR2855092B1 (fr) * 2003-05-23 2006-11-10 Sovemine Ingenierie Machine a fendre plusieurs modeles d'ardoises avec un seul ciseau
FR2865552A1 (fr) * 2003-05-23 2005-07-29 Guy Danthony Dispositif de masques pour ecran de cinema
FR2882957B1 (fr) * 2005-03-14 2007-07-13 Sovemine Ingenierie Sarl Procede et machine a fendre les ardoises de differentes dimensions a l'aide d'un ciseau unique
FR2882956A1 (fr) * 2005-03-14 2006-09-15 Sovemine Ingenierie Sarl Procede et machine a fendre les ardoises (de differentes dimensions a l'aide d'un ciseau unique)
ITMO20110230A1 (it) * 2011-09-15 2013-03-16 Denver Spa Centro di lavoro a controllo numerico per lavorare materiale lapideo in lastra e/o in blocchi, in particolare marmo e granito
ES2431892B1 (es) * 2012-05-21 2014-09-10 Siti - B&T Group S.P.A. Aparato de corte para máquinas para cortar bloques de material esquistoso

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1243096A (en) * 1917-02-10 1917-10-16 Lilla P Watson Method and appliance for separating laminated and fibrous minerals.
DE906072C (de) * 1943-01-10 1954-03-08 Aeg Verfahren zum Spalten geschichteter Koerper, insbesondere von Glimmer, und Anordnunghierzu
DE834363C (de) * 1951-02-27 1952-03-20 Zentral Werkstatt Goettingen Verfahren und Vorrichtung zur Herstellung duenner Glimmerfolien
FR2182309A5 (sv) * 1972-04-26 1973-12-07 Angers Ardoisieres
DE2606610A1 (de) * 1976-02-19 1977-08-25 Jun German Gresser Schneidvorrichtung zum trennen und bekanten von natur- und kunststeinen o.ae. mittels hochdruckfluessigkeitsstrahl

Also Published As

Publication number Publication date
NO913291D0 (no) 1991-08-22
EP0506770A1 (en) 1992-10-07
DE69022741T2 (de) 1996-05-30
PT96309B (pt) 1998-07-31
SE8904342D0 (sv) 1989-12-22
AU6974391A (en) 1991-07-24
NO913291L (no) 1991-08-22
SE8904342A (sv) 1991-03-04
PT96309A (pt) 1992-08-31
DE69022741D1 (de) 1995-11-02
ATE128400T1 (de) 1995-10-15
ES2080292T3 (es) 1996-02-01
BR9007944A (pt) 1992-10-27
SE464068B (sv) 1991-03-04
WO1991009715A1 (en) 1991-07-11
NO180369B (no) 1996-12-30
NO180369C (no) 1997-04-09

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