EP0514352A1 - Maschine zum Konditionieren und Verteilen von Zementmischungen, insbesondere für Gipsspritzen - Google Patents

Maschine zum Konditionieren und Verteilen von Zementmischungen, insbesondere für Gipsspritzen Download PDF

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Publication number
EP0514352A1
EP0514352A1 EP92830211A EP92830211A EP0514352A1 EP 0514352 A1 EP0514352 A1 EP 0514352A1 EP 92830211 A EP92830211 A EP 92830211A EP 92830211 A EP92830211 A EP 92830211A EP 0514352 A1 EP0514352 A1 EP 0514352A1
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EP
European Patent Office
Prior art keywords
machine
pan
mix
rollers
way
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Withdrawn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
EP92830211A
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English (en)
French (fr)
Inventor
Giuseppe Pattarini
Enrico Gadioli
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.)
AZ SERVICE Srl
Original Assignee
AZ SERVICE Srl
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 AZ SERVICE Srl filed Critical AZ SERVICE Srl
Publication of EP0514352A1 publication Critical patent/EP0514352A1/de
Withdrawn legal-status Critical Current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
    • B28C5/1238—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 for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices
    • B28C5/1253—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 for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices with discharging devices
    • B28C5/1261—Applying pressure for discharging
    • 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/74—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with rotary cylinders

Definitions

  • the present invention relates to a machine by means of which to condition and distribute cement mixes, in particular for plaster spraying.
  • a plastered surface consists in one or more coats of a cement mortar applied to a wall or a ceiling to the end of affording protection and providing a smooth finish.
  • cement mortars used for plastering are the same as for general brickwork, but with a greater proportion of binder in the mix.
  • the traditional type of plastered surface obtained with such compositions will tend to exhibit hairline cracks, produced as the cement contracts and cures, with the result that the plaster presents a poor appearance and is structurally unsound.
  • fibres are preferred to mesh since the difficulty of positioning the mesh on the surface is eliminated, as also are the high costs of the mesh material itself; moreover, the reinforcement provided by the fibres is three-dimensional whereas that of the mesh is two-dimensional.
  • the plaster can be applied to the surface manually, or sprayed mechanically with a machine by which the cement mortar is projected in a pressurized jet.
  • Plaster spraying machines currently in general use essentially comprise a pan in which to collect and hold mortar, prepared previously by a cement mixer, and a motor-driven feed screw at the bottom of the pan by which the mortar is directed into an outlet duct terminating with a nozzle. Once in the outlet duct, the mortar is invested with a stream of air supplied from a compressor driven by the same motor as that which operates the screw, and thus forcibly ejected.
  • the plaster Projecting the mix at high velocity onto a surface in this manner, the plaster acquires properties of adherence, imperviousness to water and mechanical strength superior to those obtainable when applying the mix by hand.
  • plaster sprayers allow a considerable reduction in job times, thereby saving on labour and limiting costs.
  • the purpose of the screen consisting generally in a mesh of square holes 1 cm across, is to prevent larger foreign bodies from entering the pan. Nonetheless, it is still possible for bodies of dimensions smaller than the mesh size, and capable of blocking the nozzle, to pass through the screen and occasion a stoppage in the operation of the machine.
  • the operation of the machine must also be suspended periodically to clean off the material retained by the screen.
  • these fibres are between 19 and 64 mm or thereabouts in length, according to different building requirements and uses, and must be added to the mix in precise proportions if the desired level of reinforcement is to be achieved.
  • the microfibres tend to accumulate and cling to the mesh over the pan.
  • the surface to be plastered does not receive a mix containing the fibres in a percentage proportion considered optimum for the purpose of reinforcement. Neither is it advantageous, however, simply to add greater quantities of the microfibre to the mix in an attempt to obtain a given minimum percentage in the plaster.
  • the object of the present invention is to overcome the drawbacks typical of the prior art as outlined above, by providing a machine for conditioning and distributing cement mixes such as will be capable of sizing ingredients uniformly and investing them with suitable properties in terms of granulometry and of the percentage content of microfibres, if added, and which can eliminate the risk of blockage affecting the spray outlet nozzle and/or the screen associated with the collection pan.
  • Another object of the invention is to enable the embodiment of such a machine by the simple addition of determined components to a conventional plaster spraying machine, though without substantially modifying the existing machine.
  • a machine for conditioning and distributing cement mixes in particular as used for plastering of the type comprising a collection pan in which to deposit a previously blended mixture of aggregates and binders destined to be applied to a wall as a coat of plaster, a feed screw positioned at the bottom of the pan and driven by a motor, an outlet duct into which the mix is directed from the pan by the feed screw, a compressor by which air is directed forcibly into the outlet duct, a nozzle associated with the end of the outlet duct from which the mix is expelled in a jet of compressed air produced by the compressor, and screening means positioned over the collection pan and serving to ensure a uniform particle size of the ingredients utilized in the mix, which is characterized in that the screening means comprise:
  • the present invention relates to a machine, denoted 1 in its entirety, by means of which to condition and distribute cement mortar mixes typically as used in plastering.
  • the machine 1 consists essentially in a collection pan 3 and, fitted to the bottom of the pan, a feed screw not illustrated in any of the drawings, being conventional in embodiment and incidental to the invention.
  • the pan 3 is filled with a mixture of fine aggregates and binders blended previously by a cement mixer, likewise not illustrated other than by the presence of a chute denoted 4, and destined ultimately to be applied to a wall as plaster. From the pan 3, the mix is directed by the rotation of the screw into an outlet hose 6 terminating in a nozzle 7; the screw is driven by a motor denoted 5.
  • the same motor 5 also drives a compressor 8, also of conventional embodiment, by which air is forced into the hose 6 in such a way that the mix can be expelled under pressure from the nozzle 7.
  • the collection pan 3 is surmounted by screening means, denoted 2 in their entirety, of which the purpose is to ensure that the ingredients of the mix are reduced to a uniform maximum particle size before entering the pan 3.
  • such screening means 2 comprise a supporting frame 11 secured to the pan 3 by fastening means such as bolts 12, and thus removable from the machine.
  • the supporting frame 11 in turn comprises a base 13 embodied as a substantially rectangular plate-like element 13a affording a central void 13a through which the mix is allowed to pass into the pan 3; this same plate-like element 13a also incorporates two end flanges 14 positively engaging the rim of the pan 3.
  • a hollow structure or casing 15 rigidly associated with the base 13 and encompassing a conditioning chamber 15a of which the top part communicates with an inlet 16 admitting the mix, and the bottom part communicates with the pan 3 by way of the void 13b.
  • the inlet 16 is framed and surmounted by an infeed hopper 17 fitted with an internal grille 18 for the safety of the user.
  • the casing 15 affords handles 15b, one on either side, allowing the screening means 2 to be lifted clear and distanced from the machine 1 whenever their removal becomes necessary.
  • the screening means 2 further comprise a pair of sizing rollers 19 associated with the casing 15, and more exactly a first roller 19a and a second roller 19b positioned face to face internally of the conditioning chamber 15a.
  • the sizing rollers 19 are anchored rotatably to the casing 15 in such a way as to turn on respective parallel axes spaced mutually apart by a predetermined distance.
  • the peripheral surfaces of the first roller 19a and the second roller 19b each exhibit a plurality of first corrugations 20, consisting in a succession of circumferential grooves 20a alternated with corresponding circumferential projections 20b.
  • rollers 19 exhibit substantially hemispherical second corrugations 21 distributed randomly over the first corrugations 20, as shown in fig 4.
  • second corrugations might be produced by the simple application of welding spots.
  • the two sizing rollers 19 are associated with means of interconnection denoted 22, and constrained by them to rotate in mutually opposite directions.
  • Such means of interconnection 22 comprise at least one pair of gears 23 and 24 engaged in constant mesh, positioned externally of the casing 15 and keyed to respective first ends 25a and 26a of two corresponding shafts denoted 25 and 26 which span the casing and are rotatable about their respective axes.
  • Each shaft 25 and 26 carries one of the two sizing rollers 19a and 19b, and the gears 23 and 24 serve thus to transmit rotation from one roller to the other.
  • the sizing rollers 19 are driven by a motor 29 mounted to the supporting frame 11 externally of the casing 15, to which the first sizing roller 19a is coupled mechanically by means of at least one drive belt 30.
  • Three belts 30 are shown in the example of the drawings, looped around a driving pulley 31 associated with the motor 29 and a driven pulley 32 keyed externally of the casing 15 to a second end 25b of the shaft 25 carrying the first roller 19a, in such a way that the rotation of the motor 29 is transmitted to the first roller 19a.
  • the motor 29 is connected to a power source, in this instance the electrical power supply, by way of a control switch 33.
  • a machine according to the present invention for conditioning and distributing cement mixes, and in particular the screening means of such a machine, will operate in the following manner.
  • the screening means 2 are activated by supplying power to the motor 29, in such a way that rotation is transmitted by way of the driving pulley 31, the belts 30 and the driven pulley 32 to the shaft 25 of the first roller 19a.
  • the shaft 25 in its turn causes rotation to be transmitted from the relative gear 23 to the gear 24 associated with the shaft 26 of the second roller 19b; the two rollers 19a and 19b are thus set in rotation, the one clockwise and the other anticlockwise.
  • Mortar obtained from the materials introduced into the cement mixer will contain fine aggregates of varying granulometry, not always appropriate for the requirement in hand. Accordingly, having been poured into the hopper 17 and through the inlet 16, the mix passes between the two rollers 19a and 19b, whereupon any particles exceeding the prescribed granulometry are crushed and reduced to the correct dimensions. Thus it becomes possible to ensure that regular particle sizes are maintained in the mix.
  • the mix drops into the collection pan 3 of the machine 1 and is directed by the screw into the hose 6; air is then directed forcibly into the hose by the compressor 8 and the resulting stream of fluid is projected from the nozzle 7 onto the surface being plastered.
  • blockage of the nozzle is avoided without utilizing screens as fitted to machines of the conventional, prior art type; accordingly, it becomes possible to achieve a considerable reduction in the time taken to complete plastering jobs by virtue of the fact that pauses for cleaning of the nozzle and screen are eliminated, and work can proceed uninterrupted. The result is an appreciable reduction in operating costs.
  • the invention can be carried into effect simply by addition of the screening means described above to a conventional plaster spraying machine, replacing the usual mesh screen; neither does such a step require significant modification of the existing machine.
  • the screening means disclosed can also be utilized independently of the plaster spraying machine in sizing fine aggregates destined for a variety of uses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Confectionery (AREA)
EP92830211A 1991-05-08 1992-05-07 Maschine zum Konditionieren und Verteilen von Zementmischungen, insbesondere für Gipsspritzen Withdrawn EP0514352A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI911253 1991-05-08
ITMI911253A IT1248303B (it) 1991-05-08 1991-05-08 Macchina per il trattamento e l'erogazione di impasti cementizi, particolarmente per la realizzazione di intonaci

Publications (1)

Publication Number Publication Date
EP0514352A1 true EP0514352A1 (de) 1992-11-19

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ID=11359858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92830211A Withdrawn EP0514352A1 (de) 1991-05-08 1992-05-07 Maschine zum Konditionieren und Verteilen von Zementmischungen, insbesondere für Gipsspritzen

Country Status (2)

Country Link
EP (1) EP0514352A1 (de)
IT (1) IT1248303B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163589A1 (de) * 2001-12-21 2003-08-07 Tesa Ag Selbstklebend ausgerüstete Etiketten, Verfahren zur Herstellung dieser sowie ihre Verwendung

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE535402A (de) *
DE353202C (de) * 1922-05-12 Hans Zettler Teigwalzmaschine
CH244828A (fr) * 1945-03-12 1946-10-15 Samap S A Installation pour la fabrication de pâtes et notamment de pâtes à pain.
DE2005787A1 (en) * 1970-02-09 1971-09-02 Rittmeier, Werner, 3400 Gottingen Mixing and transport plant for quicksettingplasters
DE2144439A1 (de) * 1971-09-04 1973-03-08 Sedlmeier & Raschke Maschinen Betonmischvorrichtung mit einem auf einem fahrgestell angeordneten, mit einem ruehrwerk versehenen betonmischbehaelter
EP0032783A1 (de) * 1980-01-22 1981-07-29 Mono Oakes Limited Verfahren und Vorrichtung zum Herstellen von Zement oder Gips
FR2474335A1 (fr) * 1980-01-25 1981-07-31 Sredneaziat Nii Prirod Gaza Procede de preparation de boue de forage, dispositif pour sa mise en oeuvre et boue de forage ainsi preparee
DE8435987U1 (de) * 1984-12-08 1987-05-07 MTU Motoren- und Turbinen-Union München GmbH, 8000 München Vorrichtung zum Vergleichmäßigen der Teilchengröße feinteiligen Pulvers
FR2615439A1 (fr) * 1987-05-22 1988-11-25 Turbosol Produzione Spa Machine pour le transport et la projection de mortiers, enduits et melanges similaires

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE535402A (de) *
DE353202C (de) * 1922-05-12 Hans Zettler Teigwalzmaschine
CH244828A (fr) * 1945-03-12 1946-10-15 Samap S A Installation pour la fabrication de pâtes et notamment de pâtes à pain.
DE2005787A1 (en) * 1970-02-09 1971-09-02 Rittmeier, Werner, 3400 Gottingen Mixing and transport plant for quicksettingplasters
DE2144439A1 (de) * 1971-09-04 1973-03-08 Sedlmeier & Raschke Maschinen Betonmischvorrichtung mit einem auf einem fahrgestell angeordneten, mit einem ruehrwerk versehenen betonmischbehaelter
EP0032783A1 (de) * 1980-01-22 1981-07-29 Mono Oakes Limited Verfahren und Vorrichtung zum Herstellen von Zement oder Gips
FR2474335A1 (fr) * 1980-01-25 1981-07-31 Sredneaziat Nii Prirod Gaza Procede de preparation de boue de forage, dispositif pour sa mise en oeuvre et boue de forage ainsi preparee
DE8435987U1 (de) * 1984-12-08 1987-05-07 MTU Motoren- und Turbinen-Union München GmbH, 8000 München Vorrichtung zum Vergleichmäßigen der Teilchengröße feinteiligen Pulvers
FR2615439A1 (fr) * 1987-05-22 1988-11-25 Turbosol Produzione Spa Machine pour le transport et la projection de mortiers, enduits et melanges similaires

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 74 (C-273)(1797) 3 April 1985 & JP-A-59 209 634 ( MATSUSHITA ) 28 November 1984 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163589A1 (de) * 2001-12-21 2003-08-07 Tesa Ag Selbstklebend ausgerüstete Etiketten, Verfahren zur Herstellung dieser sowie ihre Verwendung

Also Published As

Publication number Publication date
ITMI911253A0 (it) 1991-05-08
IT1248303B (it) 1995-01-05
ITMI911253A1 (it) 1992-11-08

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