EP0305707B1 - Mélangeur pour la fabrication de mortier au moyen de liants à granulation fine en particulier de plâtre - Google Patents

Mélangeur pour la fabrication de mortier au moyen de liants à granulation fine en particulier de plâtre Download PDF

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Publication number
EP0305707B1
EP0305707B1 EP88111388A EP88111388A EP0305707B1 EP 0305707 B1 EP0305707 B1 EP 0305707B1 EP 88111388 A EP88111388 A EP 88111388A EP 88111388 A EP88111388 A EP 88111388A EP 0305707 B1 EP0305707 B1 EP 0305707B1
Authority
EP
European Patent Office
Prior art keywords
rotor disc
housing
mixer
water
gypsum
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
EP88111388A
Other languages
German (de)
English (en)
Other versions
EP0305707A3 (en
EP0305707A2 (fr
Inventor
Kurt Eberhardt
Reinhold Nibbrig
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.)
Grenzebach BSH GmbH
Grenzebach GmbH and Co KG
Original Assignee
Babcock BSH AG
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
Priority claimed from DE8711865U external-priority patent/DE8711865U1/de
Priority claimed from DE3729233A external-priority patent/DE3729233C1/de
Application filed by Babcock BSH AG filed Critical Babcock BSH AG
Priority to AT88111388T priority Critical patent/ATE68398T1/de
Publication of EP0305707A2 publication Critical patent/EP0305707A2/fr
Publication of EP0305707A3 publication Critical patent/EP0305707A3/de
Application granted granted Critical
Publication of EP0305707B1 publication Critical patent/EP0305707B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/16—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a vertical or steeply inclined axis
    • B28C5/166—Pan-type mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/70—Spray-mixers, e.g. for mixing intersecting sheets of material
    • B01F25/74—Spray-mixers, e.g. for mixing intersecting sheets of material with rotating parts, e.g. discs
    • B01F25/743—Spray-mixers, e.g. for mixing intersecting sheets of material with rotating parts, e.g. discs the material being fed on both sides of a part rotating about a vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/80—Falling particle mixers, e.g. with repeated agitation along a vertical axis
    • B01F25/85—Falling particle mixers, e.g. with repeated agitation along a vertical axis wherein the particles fall onto a film that flows along the inner wall of a mixer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/93—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with rotary discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/28—Mixing cement, mortar, clay, plaster or concrete ingredients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids

Definitions

  • the invention relates to a mixer for producing mortar from fine-grained binder, in particular gypsum, according to the preamble of patent claim 1.
  • gypsum powder hemihydrate
  • additives with water in the gypsum mixer are processed to gypsum paste, which is distributed on a continuously moving endless belt and sets there.
  • the set gypsum (dihydrate) is then cut into plates.
  • Water, gypsum powder and additives are fed onto the rotating rotor disc from above.
  • the centrifugal force transports the solid and liquid substances out between the pins. They are mixed and, if available, through the coarse toothing of the rotor disc.
  • the gypsum slurry flows through one or more outlets onto the belt.
  • a disadvantage of these mixers is that due to the constant supply of new material, gypsum pulp gets under the rotor disk into the space between the rotor disk and the housing base and sets. The resulting hard dihydrate deposits block or jam the rotor disc. They are ground and lead to signs of wear. The ground dihydrate deposits are removed together with the gypsum paste from the gypsum mixer onto the belt.
  • the dihydrate particles form inert nests in the gypsum paste from non-setting dihydrate and selectively accelerate the setting at these points. This leads to irregularly distributed weak and damaged areas in the finished plasterboard. Since the production speed is set to constant setting, a partial acceleration also disrupts the production process.
  • pin mixers Another disadvantage of these pin mixers is that certain qualities of the gypsum board cannot be produced at all or only poorly, because the interlocking rows of pins prevent the intermixing of foam, chips, long glass fibers or other fibrous substances.
  • Supplied foam is broken up by the interlocking pins, larger bubbles form, which leads to an inhomogeneous structure and thus to density fluctuations in the finished panels.
  • Feeded shavings get stuck between the pins and long fibers lay around the pins and form braids. Both effects disrupt the running of the machines, impair the quality of the gypsum paste and lead to great maintenance.
  • pin mixer A major disadvantage of the pin mixer is that dihydrate particles above and below the rotor disk, as well as chips and fibers if necessary, by clogging the plaster mixer, by blocking or jamming of the rotor disk and by signs of wear and tear cause a high level of repair and maintenance.
  • DE-OS 29 31 782 describes a generic mixer in which the pins are replaced by interlocking deflecting vanes and centrifugal pump elements, which increases the efficiency of the mixer.
  • a scraper is attached to the underside of the rotor disc, which protrudes into the small space and serves to remove penetrating gypsum pulp.
  • the scraper has the disadvantage that it wears out and the distance between the rotor disk and the housing base must be readjusted regularly. The adjustment is not possible exactly because you cannot see into the space in between.
  • the deflecting vanes and the centrifugal pump elements are shaped and arranged in such a way that the flow shadow is reduced compared to that of the pin mixer, they also cannot completely prevent the formation of dihydrate particles, which are mixed into the gypsum slurry and which have a severe adverse effect on the quality of the plates and the production process prevent.
  • Interlocking deflecting vanes and centrifugal pump elements also break up the foam supplied and form obstacles for chips and long fibers. With this mixer too, certain qualities of the gypsum board can therefore not be produced or can only be produced inadequately.
  • This mixer also incurs additional maintenance due to the wear of the deflection blades and centrifugal pump elements.
  • the invention has for its object to develop a mixer according to the preamble of claim 1, with the well-mixed mortar, in particular gypsum paste, can be continuously produced for different qualities with little maintenance.
  • the maintenance effort is significantly reduced.
  • the feature of claim 2 has the manufacturing advantage that in the case of a labyrinthine constriction, the narrowest points can be produced with low tolerance, so that a sufficiently high flow resistance can be produced in a simple manner.
  • the advantage of the feature of claim 3 is that gypsum powder is fed evenly to the water, so that the substances are mixed as soon as they are supplied. Due to the ring-shaped water inlets and the concave rounding of the rotor disk located below the water inlets, the water is evenly distributed on the rotor disk to form an uninterrupted, smooth film onto which the gypsum powder falls, thereby improving the mixing effect.
  • the gypsum boards have a uniform consistency because there are no flow shadows due to the smooth surface of the rotor disk and the cover and now neither below nor on the rotor disk Dihydrate particles are formed. Irregularly distributed weak and damaged areas in the gypsum board due to the enclosed dihydrate and setting at different speeds are avoided.
  • various qualities of finished gypsum board can be produced by mixing in foam, chips or long fibers, whereby foam reduces the specific weight and improves the thermal insulation and chips or fibers increase the flexural strength. Faults caused by chips or fibers stuck between pins no longer occur, which further reduces maintenance.
  • the feature of claim 4 has the advantage that there is no rust on the rotor disk, which would promote the adhesion and setting of the gypsum paste.
  • Fig. 1 shows the plaster mixer partially as a longitudinal section.
  • Fig. 2 shows the labyrinthine constriction enlarged.
  • FIG 3 shows the housing base or the rotor disk with the toothing.
  • Arrow A points in the direction of rotation of the rotor disc and arrow B in the direction of movement of the belt.
  • the plaster mixer arranged in a frame essentially consists of a flat cylindrical housing 1, in which a rotor disk 3 which is rotatable about the vertical housing axis 2 is mounted.
  • a motor 4 for driving the rotor disk 3 is mounted above the housing 1.
  • the rotor disk 3 is made of stainless steel or provided with a wear plate made of stainless material. It has a thickening on the upper side in the vicinity of axis 2, the diameter of which is approximately one third of the disk diameter.
  • the transition between the thickening and the flat outer ring zone has a concave curve 5; i.e. the transition has the shape of a wedge, the flank of which is bent downwards.
  • the rotor disk 3 is smooth on the top and completely free of projections.
  • the rotor disk 3 is provided with coarse teeth 6.
  • the tooth flanks in the direction of rotation e.g. right flanks when turning clockwise in Fig. 3 form an acute angle to the horizontal.
  • the tooth tips extend close to the cylindrical housing wall.
  • rod-shaped scrapers 8 are mounted in the middle that extend close to the housing wall and can be rotated about the housing axis 2 by means of a separate drive 9.
  • the housing cover 7 is completely free on its underside as well as the top of the rotor disk 3 from pins and other projecting parts.
  • the housing base 13 In the housing base 13, four outlets 14 for the gypsum slurry are distributed on a semicircle near the edge below the teeth 6.
  • a water supply line 15 In the housing base 13 there is a water supply line 15 provided with a metering device, which is under a pressure of 3 bar. The distance of the water supply line 15 from the axis 2 is smaller than the radius of the area delimited by the toothing 6 of the rotor disk 3.
  • the small space between the housing base 13 and the rotor disk 3 is sealed off from the axis 2 with a stuffing box 16 and has a labyrinthine constriction 17 towards the edge, which encloses the area in which the water supply line 15 is connected. Apart from the four outlets 14 and the opening for the water supply line 15, the housing base 13 is completely free of openings.
  • the constriction 17 is formed by an annular groove 18 in the housing base 13 and a ring 19 immersed in this annular groove 18 on the underside of the rotor disk 3.
  • the immersed ring 19 is located on the edge of the rotor disk 3 within the toothing 6.
  • the narrowest points of the constriction 17 are the lateral distances 20 between the ring groove 18 and the ring 19.
  • the mixer is also suitable for the continuous production of lime mortar for plastering large areas, as well as for the production of plastic mortar and mortar based on cement or lime for the production of precast elements.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Claims (4)

  1. Mélangeur comprenant un boîtier cylindrique (1), un disque de rotor (3) à l'intérieur du boîtier (1), qui est capable de tourner autour de l'axe vertical du boîtier et qui présente, à son bord, une denture grossière (6), au moins une entrée d'eau (10) et au moins une entrée (11) pour des matières solides dans le couvercle (7) et au moins une sortie (14) pour la pâte de plâtre à proximité du bord du fond (13) du boîtier, en dessous de la denture (6) du disque de rotor (3), caractérisé par au moins une amenée d'eau dosable (15) à l'intérieur de la zone du fond (13) du boîtier qui est limitée par la denture (6) du disque de rotor (3), et par un rétrécissement (17) annulaire du petit intervalle entre le fond (13) du boîtier et le disque de rotor (3), ce rétrécissement étant agencé entre l'amenée d'eau (15) et la zone limitée par la denture (6) du disque de rotor (3).
  2. Mélangeur suivant la revendication 1, caractérisé en ce que le rétrécissement (17) est exécuté en forme de labyrinthe.
  3. Mélangeur suivant l'une des revendications 1 et 2, caractérisé en ce que plusieurs entrées d'eau (10) sont disposées en forme de couronne autour de l'axe (2) et en ce que le disque de rotor (3) présente, aux environs de l'axe (2), un épaississement qui, en dessous des entrées d'eau (10), se transforme sous la forme d'une courbure concave (5), en une zone annulaire extérieure.
  4. Mélangeur suivant la revendication 3, caractérisé en ce que le disque de rotor (3) est fabriqué en acier inoxydable ou est pourvu d'une plaque d'usure en acier inoxydable.
EP88111388A 1987-09-02 1988-07-15 Mélangeur pour la fabrication de mortier au moyen de liants à granulation fine en particulier de plâtre Expired - Lifetime EP0305707B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88111388T ATE68398T1 (de) 1987-09-02 1988-07-15 Mischer zum herstellen von moertel aus feinkoernigen bindemitteln, insbesondere gips.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8711865U DE8711865U1 (de) 1987-09-02 1987-09-02 Kontinuierlicher Gipsmischer
DE8711865U 1987-09-02
DE3729233 1987-09-02
DE3729233A DE3729233C1 (en) 1987-09-02 1987-09-02 Continuous gypsum mixer

Publications (3)

Publication Number Publication Date
EP0305707A2 EP0305707A2 (fr) 1989-03-08
EP0305707A3 EP0305707A3 (en) 1990-10-31
EP0305707B1 true EP0305707B1 (fr) 1991-10-16

Family

ID=25859288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111388A Expired - Lifetime EP0305707B1 (fr) 1987-09-02 1988-07-15 Mélangeur pour la fabrication de mortier au moyen de liants à granulation fine en particulier de plâtre

Country Status (6)

Country Link
US (1) US4995729A (fr)
EP (1) EP0305707B1 (fr)
AT (1) ATE68398T1 (fr)
DE (1) DE3865603D1 (fr)
ES (1) ES2026972T3 (fr)
GR (1) GR3003341T3 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5865534A (en) * 1993-10-01 1999-02-02 Idc Mixers Limited Materials mixer
US6059444A (en) * 1998-01-28 2000-05-09 United States Gypsum Company Apparatus for mixing calcined gypsum and its method of operation
DE19830665C2 (de) * 1998-07-09 2003-08-28 Grenzebach Bsh Gmbh Verfahren zur Herstellung poriger Pasten, insbesondere porigem Gipsbrei, und Mischer
JP3273927B2 (ja) 1999-03-19 2002-04-15 吉野石膏株式会社 混合撹拌機
US6376558B1 (en) 2000-01-06 2002-04-23 Babcock-Bsh Gmbh Method of producing a porous paste, especially a porous plaster slurry, and a mixer for preparing such paste or slurry
US6494609B1 (en) * 2001-07-16 2002-12-17 United States Gypsum Company Slurry mixer outlet
US7718019B2 (en) * 2005-04-27 2010-05-18 United States Gypsum Company Methods of and systems for preparing a heat resistant accelerant slurry and adding the accelerant slurry to a post-mixer aqueous dispersion of calcined gypsum
US8016960B2 (en) * 2005-04-27 2011-09-13 United States Gypsum Company Methods of and systems for adding a high viscosity gypsum additive to a post-mixer aqueous dispersion of calcined gypsum
US20060243171A1 (en) * 2005-04-27 2006-11-02 United States Gypsum Company Wet gypsum accelerator and methods, composition, and product relating thereto
US10537863B2 (en) 2015-12-31 2020-01-21 United States Gypsum Company Constrictor valve with webbing, cementitious slurry mixing and dispensing assembly, and method for making cementitious product
US20220184848A1 (en) * 2019-04-15 2022-06-16 Yoshino Gypsum Co., Ltd. Pretreatment mixing and stirring device, gypsum slurry manufacturing apparatus, building board manufacturing apparatus, pretreatment calcined gypsum manufacturing method, gypsum slurry manufacturing method, building board manufacturing method

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
US2425689A (en) * 1940-02-16 1947-08-12 Schwarz Engineering Company In Treatment of fruit and vegetable juices
US2573425A (en) * 1947-06-23 1951-10-30 Ethel K Haferkamp Seal for centrifugal machines
US2903970A (en) * 1955-03-24 1959-09-15 United Aircraft Corp Combination seal for a pump
US3018091A (en) * 1959-04-10 1962-01-23 Du Pont Precipitation apparatus
US3081069A (en) * 1959-09-14 1963-03-12 Et Oakes Corp Mixing apparatus
US3131641A (en) * 1962-08-17 1964-05-05 United Aircraft Corp Dynamic seal improvement
BE681488A (fr) * 1965-10-25 1966-10-31
FR1601881A (fr) * 1967-12-16 1970-09-21
US3774887A (en) * 1969-11-19 1973-11-27 Cincinnati Milacron Inc Apparatus for mixing coreactive liquids which forms polyurethanes
US3756570A (en) * 1971-09-29 1973-09-04 W Buhner Apparatus for continuous dispersion and homogenization of predominantly viscous substances
CH602222A5 (fr) * 1976-03-25 1978-07-31 Escher Wyss Ag
US4196910A (en) * 1977-05-19 1980-04-08 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Shaft sealing device for turbocharger
US4176972A (en) * 1978-08-09 1979-12-04 National Gypsum Company Coaxial pump mixer
EP0045582B1 (fr) * 1980-08-01 1984-11-07 Imperial Chemical Industries Plc Etanchéification de l'appareil tourneur pour contact gaz-liquide
US4329066A (en) * 1980-09-22 1982-05-11 Nemo Ivarson Method and apparatus for continuously mixing a liquid and powder

Also Published As

Publication number Publication date
ES2026972T3 (es) 1992-05-16
EP0305707A3 (en) 1990-10-31
EP0305707A2 (fr) 1989-03-08
ATE68398T1 (de) 1991-11-15
DE3865603D1 (de) 1991-11-21
GR3003341T3 (en) 1993-02-17
US4995729A (en) 1991-02-26

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