EP0566171A1 - Steuervorrichtung an einer Form für keramisches Material - Google Patents

Steuervorrichtung an einer Form für keramisches Material Download PDF

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Publication number
EP0566171A1
EP0566171A1 EP93200534A EP93200534A EP0566171A1 EP 0566171 A1 EP0566171 A1 EP 0566171A1 EP 93200534 A EP93200534 A EP 93200534A EP 93200534 A EP93200534 A EP 93200534A EP 0566171 A1 EP0566171 A1 EP 0566171A1
Authority
EP
European Patent Office
Prior art keywords
piston
die
chamber
plate
mold
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
EP93200534A
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English (en)
French (fr)
Other versions
EP0566171B1 (de
Inventor
Lodovico Bardelli
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.)
Mass SpA
Original Assignee
Mass SpA
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Filing date
Publication date
Application filed by Mass SpA filed Critical Mass SpA
Publication of EP0566171A1 publication Critical patent/EP0566171A1/de
Application granted granted Critical
Publication of EP0566171B1 publication Critical patent/EP0566171B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005—Control arrangements

Definitions

  • This invention relates generally to ceramic tile manufacture, and in particular concerns a control device for molds used for producing ceramic tiles.
  • molds of various types are used in tile manufacture, all comprising:
  • the aforesaid elements constitute the essential parts of known ceramic molds, of which the following main types can be identified:
  • the upper die is raised on command by the cross-member of the ceramic press,
  • the lower die moves to the level occupied by the upper face of the die-plate.
  • the lower die is lifted by the mould lower plate, the tile being extracted from the forming cavity by said lifting, ready to be removed.
  • a suitable loading trolley (for example for atomized clay) receives permission to advance and hence remove the tile from the die-plate, with a slight delay the lower die then lowering to a predetermined level.
  • the thickness is defined for the atomized clay, which the trolley can now discharge into the forming cavity.
  • the same mold is often used to form other types of product such as so-called "pressure-glazed” tiles, and tiles with a multi-component support, these being prepared by pressing two different materials together.
  • the same or a different trolley then deposits a layer of powdered ceramic glaze on the clay.
  • the upper die is lowered to form the (pressure-glazed) tile, after which the upper die is raised, followed by the lower die to move the tile into its discharge position, after which a further load- ing/pressing cycle begins.
  • the clay characteristics such as its moisture content, its average particle size and the ratio of finer particle quantity to coarser particle quantity can change, and as is well known to the expert of the art these characteristics can result in even fairly large variations in the final tile thickness and in various problems during their firing.
  • the column of this document comprises a hydraulic cylinder
  • said two telescopic annular pistons are associated with a surrounding bush for defining the upward stroke of the outer piston, where this latter determines the loading of said layer of ciay, the thickness of said layer being varied according to requirements by adjusting the axial position of said bush.
  • said adjustment is made by a screw-nut device provided between the bush and an outer body, and by a worm-helical gear linkage operated by an electronic card micromotor.
  • Respective screw-nut adjustment means are also interposed between said damping piston and the mould die-plate and between said hydraulic cylinder and the mold lower plate, the first adjusting the height of the die-plate and the second defining the upward end-of-travel position of said outer annular piston.
  • Sensor means are also provided associated with said surrounding bush, and are combined with the hydraulic circuit which operates the inner annular piston, in order to determine (if necessary) an intermediate lower (or backward) position for the inner annular piston before it reaches its downward end-of-travel position.
  • a layer of powdered ceramic glaze (or other material in powder or granular form) can be deposited on the layer of clay (or other material) fed into the forming cavity or cavities of the die-plate.
  • the column of the cited document comprises a relatively large number of component parts, making it rather complex and bulky, and also relatively very costly.
  • the main object of the present invention is to provide a ceramic mold control device which solves the initially discussed problems and overcomes the aforelisted drawbacks, within the framework of a simple and rational construction.
  • the device of the invention can be associated with any known type ofcer- amic mold, with a movable or fixed die-plate, and comprising any number of forming cavities of any shape and size.
  • Each plate 1 is provided with two devices 5 according to the invention, said four devices 5 (see Figures 4, 5) supporting the mold lower plate 6 as described hereinafter.
  • This latter comprises on its underside a block 7 ( Figures 5, 6) and on its upper side a series of dies 8, such as reverse face dies for forming the laying side of the tiles.
  • a dust protection bellows 9 ( Figure 6) is provided between the block 7 and platform 3, the block 7 resting on the platform 3 during tile compacting.
  • Said dies 8 are slidingly housed in forming cavities 10 provided in the mold die-plate 11, which is supported by four usual hydraulic dampers 12f ixed to the plates 1 as can be seen in Figures 4 to 6.
  • dampers 12 are connected to a common pressurized hydraulic reservoir, the operating pressure of which can be regulated as required.
  • the plates 1 comprise a cylindrical recess with differing cross-sections, and with which there is associated a series of hydraulic oil feed/discharge ducts.
  • annular piston 18 On the rod 16 there slides under sealed conditions an annular piston 18 which is inserted into a flanged bush 19 of differing cross-sections.
  • a chamber 21 from which there extends a duct 210 connected to a pressurized hydraulic reservoir.
  • said chamber 21 acts as a damper.
  • annular chamber 22 from which there extends a service duct 220 connected to the actuator 23 (see Figures 2, 3), to which reference will be made hereinafter.
  • Said holed base is traversed by a rod 25 deriving from an underlying piston 26 slidable within the bush 19.
  • the rod 25 is provided with a threaded hole 250 forfixing the plate 6 (die carrier) by means of a robust screw 251 (see Figure 6).
  • the actuator 23 comprises a hollow body 29 to one end of which the casing of a step-down unit is fixed, whereas the other end comprises four angularly equidistant cylinders 31.
  • the body 29, the casing 30 and the cylinders 31 are closed by respective holed covers 290, 300 and 310.
  • This latter at the end facing the cover 290, is pointed, for example as a frusto-conical orfrusto-pyramidal point, against which the conjugate ends of four pistons 34 contained in said cylinders 31 rest.
  • each cylinder 31 At the opposite end of each cylinder 31 there is provided a second piston 35, between said two pistons 34 and 35 there being interposed a compression spring 36.
  • a chamber 360 into which the duct 220 connected to the chamber 22 opens (see Figure 1), an adjustable stop 37 being associated with the second piston 35 of said pair.
  • This stop consists of a through screw screwed into the cover 310, its purpose being specified hereinafter.
  • the hollow rod 322 is connected via adjustable timed valve means to a hydraulic circuit the purpose of which is specified hereinafter.
  • the chamber 320 of the slider 32 contains a piston 38, the rod 380 of which passes through said plug 321. Against the free end of said rod 380 there rests a coaxial push rod 30 connected at one end (to the left in Figure 2) to a helical gear 400 via a screw-nut linkage 40, at its other end (to the right in Figure 2) it being locked torsionally, but not axially, relative to the cover 300 by a key 41. Finally, a worm 401 with an electronic card-type operating motor (not shown) engages said helical gear 400.
  • the described actuator 23 is to be located on the press control panel, whereas the fourdevices 5 are preferably permanently associated with the ceramic press so that ceramic mold replacement is of low cost.
  • the invention operates as follows.
  • the mold upper plate (not shown) is lowered, by which said upper plate pushes the die-plate 11 downwards, the corresponding upperdies (notshown) cooperating with the lower dies 8 to form the tiles (of pressure-glazed type, also not shown).
  • This travel determines the layer quantity of clay to be deposited in the cavity 10. After the clay loader has passed but before the arrival of the glaze loader a determined quantity of oil is fed into the chamber 320, with the result that the slider 32 advances slightly (towards the left).
  • This further lowering determines the thickness of the layer of ceramic glaze to be deposited on the clay, said glaze thickness being adjusted as required by operating the valve means associated with the hollow rod 322.
  • the thickness of the clay deposited in the cavities 10 can also be adjusted according to requirements, this being done by withdrawing or advancing the push rod 39 (see Figure 2) independently of the filling/emptying of the chamber 320 by the actuator 23 ( Figure 2).
  • the glaze loader After the glaze loader has returned to its rest position, the previously fed oil is removed from the chamber 320, and the chambers 28 and 17 are discharged. In this manner the pistons 26 and 15 return to their respective rest positions and the mold is readyforthe next pressing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Compositions Of Oxide Ceramics (AREA)
EP93200534A 1992-03-03 1993-02-25 Steuervorrichtung an einer Form für keramisches Material Expired - Lifetime EP0566171B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRE920009A IT1257486B (it) 1992-03-03 1992-03-03 Dispositivo di regolazione per stampi ceramici
ITRE920009 1992-03-03

Publications (2)

Publication Number Publication Date
EP0566171A1 true EP0566171A1 (de) 1993-10-20
EP0566171B1 EP0566171B1 (de) 1996-05-22

Family

ID=11398145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93200534A Expired - Lifetime EP0566171B1 (de) 1992-03-03 1993-02-25 Steuervorrichtung an einer Form für keramisches Material

Country Status (4)

Country Link
EP (1) EP0566171B1 (de)
AT (1) ATE138316T1 (de)
DE (1) DE69302747D1 (de)
IT (1) IT1257486B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0674980A1 (de) * 1994-03-29 1995-10-04 MASS S.p.A. Presse zur Herstellung kleiner keramischer Formkörper

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1196963B (de) * 1957-08-02 1965-07-15 Laeis Werke Ag Hydraulische Formpresse mit beweglichem Ober- und Unterstempel
DE1258319B (de) * 1958-10-29 1968-01-04 Ulrico Walchhuetter Vorrichtung zum selbsttaetigen Herstellen von gepressten Zwei-Schicht-Fliesen
GB1127647A (en) * 1964-11-28 1968-09-18 Laeis Werke Ag Automatic control system for moulding presses
DE3527594A1 (de) * 1985-08-01 1987-02-12 Sacmi Presse, insbesondere fuer die herstellung von keramikfliesen
EP0211449A1 (de) * 1985-04-10 1987-02-25 MASS S.p.A. Presse, insbesondere zum Herstellen von Dachziegeln

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1196963B (de) * 1957-08-02 1965-07-15 Laeis Werke Ag Hydraulische Formpresse mit beweglichem Ober- und Unterstempel
DE1258319B (de) * 1958-10-29 1968-01-04 Ulrico Walchhuetter Vorrichtung zum selbsttaetigen Herstellen von gepressten Zwei-Schicht-Fliesen
GB1127647A (en) * 1964-11-28 1968-09-18 Laeis Werke Ag Automatic control system for moulding presses
EP0211449A1 (de) * 1985-04-10 1987-02-25 MASS S.p.A. Presse, insbesondere zum Herstellen von Dachziegeln
DE3527594A1 (de) * 1985-08-01 1987-02-12 Sacmi Presse, insbesondere fuer die herstellung von keramikfliesen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0674980A1 (de) * 1994-03-29 1995-10-04 MASS S.p.A. Presse zur Herstellung kleiner keramischer Formkörper

Also Published As

Publication number Publication date
ATE138316T1 (de) 1996-06-15
ITRE920009A0 (it) 1992-03-03
ITRE920009A1 (it) 1993-09-03
EP0566171B1 (de) 1996-05-22
DE69302747D1 (de) 1996-06-27
IT1257486B (it) 1996-01-25

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