EP0724940A2 - A bucket mixer for mixing solid aggregates and delivering the mixture - Google Patents

A bucket mixer for mixing solid aggregates and delivering the mixture Download PDF

Info

Publication number
EP0724940A2
EP0724940A2 EP96101175A EP96101175A EP0724940A2 EP 0724940 A2 EP0724940 A2 EP 0724940A2 EP 96101175 A EP96101175 A EP 96101175A EP 96101175 A EP96101175 A EP 96101175A EP 0724940 A2 EP0724940 A2 EP 0724940A2
Authority
EP
European Patent Office
Prior art keywords
blades
bucket mixer
mixing
mixing screw
bucket
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
EP96101175A
Other languages
German (de)
French (fr)
Other versions
EP0724940A3 (en
EP0724940B1 (en
Inventor
Porello G. Battista
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.)
DITTA PORELLO G BATTISTA
Original Assignee
DITTA PORELLO G BATTISTA
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 DITTA PORELLO G BATTISTA filed Critical DITTA PORELLO G BATTISTA
Publication of EP0724940A2 publication Critical patent/EP0724940A2/en
Publication of EP0724940A3 publication Critical patent/EP0724940A3/en
Application granted granted Critical
Publication of EP0724940B1 publication Critical patent/EP0724940B1/en
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
    • B28C5/1238—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
    • B28C5/1292—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 rotating stirring and feeding or discharging means fixed on the same axis, e.g. in an inclined container fed at its lower part
    • 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
    • B01F27/05—Stirrers
    • B01F27/09—Stirrers characterised by the mounting of the stirrers with respect to the receptacle
    • B01F27/091—Stirrers characterised by the mounting of the stirrers with respect to the receptacle with elements co-operating with receptacle wall or bottom, e.g. for scraping the receptacle wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/50—Movable or transportable mixing devices or plants
    • B01F33/502—Vehicle-mounted mixing devices
    • 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
    • B28C5/14—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 horizontal or substantially horizontal axis
    • B28C5/142—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 horizontal or substantially horizontal axis the stirrer shaft carrying screw-blades

Definitions

  • the present invention refers to a bucket mixer for mixing solid aggregates and delivering the mixture. More particularly, the invention relates to a bucket mixer for mixing solid aggregates such as concrete aggregates, of the kind comprising a vessel and an inner mixing screw rotating about an axis parallel to the longitudinal axis of the vessel.
  • the bucket mixer of this invention is of the kind providing a plurality of blades mounted to the peripheral part of the mixing screw so as to extend radially as far as near to the edge of the vessel, the blades being oriented at a winding direction opposite to that of the mixing screw so as to attain the double effect of cleaning or scraping the vessel walls and urge the material in the opposite direction of that imparted by the mixing screw during operation of the bucket mixer.
  • U.S. patent No. 4,223,996 discloses an apparatus of the above discussed kind and suggests that the blades can be welded or otherwise secured in a rigid manner, permanently or removably, to the peripheral part of the mixing screw. According to this document, fixing is accomplished by restraining the inner edge of the blade in a recess obtained in the mixing screw. This solution first of all weakens the mixing screw at the points where the recesses are. Further, it makes it difficult to provide a system for releasably securing the blade to the peripheral part of the mixing screw, as these two members are substantially at a right angle with respect to each other in a point where they undergo considerably high torsion stresses. Finally, for the same reasons also the blade tends to deform rapidly. Replacing the blade may become difficult or impossible due to the manner in which it is coupled to the mixing screw.
  • Italian patent No. 1,210,783 discloses a bucket mixer of this kind wherein each blade is pivotally mounted to a support welded to the mixing screw, in order to rotate from a retracted position near the axis of the mixing screw to an extended position in proximity of the vessel.
  • a bucket mixer for mixing solid aggregates and delivering the mixture, comprising counter-current mixing means of mixing screw-like kind extending substantially throughout the whole bucket mixer and blade-like mixing means carried by the peripheral part of the mixing screw and radially extending from the edge thereof to near the inner wall of the vessel, the blades being oriented at a winding direction opposite to that of the mixing screw, characterised in that the blades are rigidly and entirely fixed in releasable manner to supports welded to the peripheral part of the mixing screw.
  • a bucket mixer of known kind provides a vessel 10 for containing the products to be mixed. Within vessel 10 there is mounted a mixing screw 11 rotating about a central longitudinal axle consisting of a shaft 12.
  • blades 13 forming preset angles therebetween.
  • the blades 13 are oriented perpendicular to the mixing screw 11 and directed towards the inner wall of the vessel 10, so as to provide counter-current mixing with respect to mixing screw 11 and clear the inside of vessel 10 during mixing.
  • the blades 13 are rigidly fixed, for example by means of bolts 14, directly or indirectly, to a support 15 welded to the peripheral part of the mixing screw 11.
  • the support 15 is a flat base. Interposed between the flat support 15 and the flat blade 13 there is an L-shaped bracket 16 connected by bolts to either members 13 and 15 (as shown in FIGS. 2 and 3) or only one of them.
  • the support 15 is L-shaped and there are no intermediate brackets as there are bolts connecting the blade to the longer portion of support 15.
  • the blade 13 is L-shaped so that its shorter portion is the one welded in 14 to support 15.
  • the blade is rigidly fixed to the mixing screw but in such way as not to cause deformation in either bodies and be easily replaced when worn or in case of failure.
  • no blades maintenance (washing) is required as there are no parts reciprocally moving during operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing Of Solid Wastes (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Screw Conveyors (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Abstract

The bucket mixer comprises a mixing screw (11) extending substantially throughout the whole bucket mixer and counter-current mixing blades (13) carried by the peripheral part of the mixing screw and radially extending from the edge thereof to near the inner wall of the vessel (10). The blades are oriented at a winding direction opposite to that of the mixing screw (11), and are rigidly and entirely fixed (14) in releasable manner to supports (15) welded to the peripheral part of the mixing screw.

Description

  • The present invention refers to a bucket mixer for mixing solid aggregates and delivering the mixture. More particularly, the invention relates to a bucket mixer for mixing solid aggregates such as concrete aggregates, of the kind comprising a vessel and an inner mixing screw rotating about an axis parallel to the longitudinal axis of the vessel.
  • Furthermore, the bucket mixer of this invention is of the kind providing a plurality of blades mounted to the peripheral part of the mixing screw so as to extend radially as far as near to the edge of the vessel, the blades being oriented at a winding direction opposite to that of the mixing screw so as to attain the double effect of cleaning or scraping the vessel walls and urge the material in the opposite direction of that imparted by the mixing screw during operation of the bucket mixer.
  • U.S. patent No. 4,223,996 discloses an apparatus of the above discussed kind and suggests that the blades can be welded or otherwise secured in a rigid manner, permanently or removably, to the peripheral part of the mixing screw. According to this document, fixing is accomplished by restraining the inner edge of the blade in a recess obtained in the mixing screw. This solution first of all weakens the mixing screw at the points where the recesses are. Further, it makes it difficult to provide a system for releasably securing the blade to the peripheral part of the mixing screw, as these two members are substantially at a right angle with respect to each other in a point where they undergo considerably high torsion stresses. Finally, for the same reasons also the blade tends to deform rapidly. Replacing the blade may become difficult or impossible due to the manner in which it is coupled to the mixing screw.
  • Italian patent No. 1,210,783 discloses a bucket mixer of this kind wherein each blade is pivotally mounted to a support welded to the mixing screw, in order to rotate from a retracted position near the axis of the mixing screw to an extended position in proximity of the vessel.
  • Practice has shown that with time, if thorough and cleaning is not carried out continuously, concrete or any other material being mixed solidifies in the interstices between the blade and the support, thereby locking the blade in a position. This cancels any benefit that pivotal mounting of the blade could involve. Further, should locking occur when the blade is retracted, the bottom of the vessel can no longer be scraped and cleared. Finally, replacing the blades is an extremely difficult and complex operation.
  • It has also been found that it is not necessary that the blades rotate to contact the walls of the vessel to attain efficient and complete cleaning. As the blades wear out with time, some provision should instead be made to allow for replacing the blades rapidly in absence of binding systems to the mixing screw which weaken either members.
  • These and further objects which will be more apparent hereinafter are attained according to the present invention by the provision of a bucket mixer for mixing solid aggregates and delivering the mixture, comprising counter-current mixing means of mixing screw-like kind extending substantially throughout the whole bucket mixer and blade-like mixing means carried by the peripheral part of the mixing screw and radially extending from the edge thereof to near the inner wall of the vessel, the blades being oriented at a winding direction opposite to that of the mixing screw, characterised in that the blades are rigidly and entirely fixed in releasable manner to supports welded to the peripheral part of the mixing screw.
  • For a better understanding of the present invention, reference is made to the following detailed description of various exemplary embodiments considered in combination with the accompanying drawings in which:
    • FIG. 1
    is a substantially front view of a bucket mixer in accordance with the present invention;
    FIGS. 2, 4 and 6
    are views of mixing blades according to the present invention in three different arrangements; and
    FIGS. 3, 5 and 7
    are views of the blades of the previous figures as seen in the directions of arrows A, B and C, respectively.
  • A bucket mixer of known kind provides a vessel 10 for containing the products to be mixed. Within vessel 10 there is mounted a mixing screw 11 rotating about a central longitudinal axle consisting of a shaft 12.
  • Still in known manner, along the peripheral part of mixing screw 11 there are mounted blades 13 forming preset angles therebetween. The blades 13 are oriented perpendicular to the mixing screw 11 and directed towards the inner wall of the vessel 10, so as to provide counter-current mixing with respect to mixing screw 11 and clear the inside of vessel 10 during mixing.
  • According to the present invention, the blades 13 are rigidly fixed, for example by means of bolts 14, directly or indirectly, to a support 15 welded to the peripheral part of the mixing screw 11.
  • As depicted in the drawings, in the solution of FIGS. 2 and 3 the support 15 is a flat base. Interposed between the flat support 15 and the flat blade 13 there is an L-shaped bracket 16 connected by bolts to either members 13 and 15 (as shown in FIGS. 2 and 3) or only one of them.
  • In the embodiment of FIGS. 4 and 5, the support 15 is L-shaped and there are no intermediate brackets as there are bolts connecting the blade to the longer portion of support 15.
  • Finally, in the solution of FIGS. 6 and 7 the blade 13 is L-shaped so that its shorter portion is the one welded in 14 to support 15.
  • In all the disclosed embodiments, the blade is rigidly fixed to the mixing screw but in such way as not to cause deformation in either bodies and be easily replaced when worn or in case of failure. In addition, no blades maintenance (washing) is required as there are no parts reciprocally moving during operation.

Claims (7)

  1. A bucket mixer for mixing solid aggregates and delivering the mixture, comprising counter-current mixing means (11) of mixing screw-like kind extending substantially throughout the whole bucket mixer and blade-like mixing means carried by the peripheral part of the mixing screw and radially extending from the edge thereof to near the inner wall of the vessel (10), the blades being oriented at a winding direction opposite to that of the mixing screw (11), characterised in that the blades (13) are rigidly and entirely fixed (14) in releasable manner to supports (15) welded to the peripheral part of the mixing screw (11).
  2. A bucket mixer as claimed in claim 1, characterised in that the blades (13) are directly fixed to the corresponding supports (15).
  3. A bucket mixer as claimed in claim 1, characterised in that the blades (13) are fixed to the corresponding supports (15) through an intermediate bracket (16) releasable from the blade or the support (15) or both.
  4. A bucket mixer as claimed in claim 3, characterised in that the intermediate bracket (16) is L-shaped.
  5. A bucket mixer as claimed in claims 1 and 2, characterised in that the blades (13) are L-shaped.
  6. A bucket mixer as claimed in claims 1 and 2, characterised in that the supports (15) are L-shaped.
  7. A bucket mixer as claimed in the previous claims, characterised in that the releasable fixing members are bolts (14).
EP96101175A 1995-02-03 1996-01-29 A bucket mixer for mixing solid aggregates and delivering the mixture Expired - Lifetime EP0724940B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO950024U 1995-02-03
IT1995TO000024U IT235773Y1 (en) 1995-02-03 1995-02-03 MIXING BUCKET OF SOLID AGGREGATES AND MIXING DISTRIBUTOR.

Publications (3)

Publication Number Publication Date
EP0724940A2 true EP0724940A2 (en) 1996-08-07
EP0724940A3 EP0724940A3 (en) 1997-03-19
EP0724940B1 EP0724940B1 (en) 2003-06-04

Family

ID=11413068

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96101175A Expired - Lifetime EP0724940B1 (en) 1995-02-03 1996-01-29 A bucket mixer for mixing solid aggregates and delivering the mixture

Country Status (5)

Country Link
EP (1) EP0724940B1 (en)
AT (1) ATE242094T1 (en)
DE (1) DE69628476T2 (en)
ES (1) ES2090003T3 (en)
IT (1) IT235773Y1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1122047A1 (en) * 2000-01-31 2001-08-08 Rabaud Improvements on a bucket mixer
FR2958865A1 (en) * 2010-04-20 2011-10-21 Emily Ets MIXER AND / OR DISPENSER BUCKET
CN108818926A (en) * 2018-07-25 2018-11-16 徐州徐工养护机械有限公司 A kind of stabilized soil mixing plant stirring blade
CN113441454A (en) * 2021-06-21 2021-09-28 常州都铂高分子有限公司 Raw materials belt cleaning device is used in aqueous binder production

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109291246A (en) * 2018-11-21 2019-02-01 马鞍山迪斯福工业设计有限公司 A kind of spouting plant for building and method
CN110405943A (en) * 2019-08-02 2019-11-05 张再兴 It is a kind of to prevent the viscous concrete central mix plant stayed of inner wall

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4223996A (en) * 1977-03-09 1980-09-23 Mathis Fertigputz Gmbh Apparatus for mixing solid and liquid constituents of mortar or the like
US4478515A (en) * 1983-09-27 1984-10-23 Stone Construction Equipment, Inc. Mortar mixer with triple eight mixing action
FR2581894A1 (en) * 1985-05-17 1986-11-21 Bernard Francois DEVICE FOR MIXING OR MIXING PASTY PRODUCTS
US4660987A (en) * 1986-02-12 1987-04-28 Tci, Inc. Blender rotor improvements
EP0284929A1 (en) * 1987-03-26 1988-10-05 General Signal Corporation Mixing apparatus and methods of fabricating same
EP0474538A1 (en) * 1990-08-28 1992-03-11 Audureau Screw mixer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4223996A (en) * 1977-03-09 1980-09-23 Mathis Fertigputz Gmbh Apparatus for mixing solid and liquid constituents of mortar or the like
US4478515A (en) * 1983-09-27 1984-10-23 Stone Construction Equipment, Inc. Mortar mixer with triple eight mixing action
FR2581894A1 (en) * 1985-05-17 1986-11-21 Bernard Francois DEVICE FOR MIXING OR MIXING PASTY PRODUCTS
US4660987A (en) * 1986-02-12 1987-04-28 Tci, Inc. Blender rotor improvements
EP0284929A1 (en) * 1987-03-26 1988-10-05 General Signal Corporation Mixing apparatus and methods of fabricating same
EP0474538A1 (en) * 1990-08-28 1992-03-11 Audureau Screw mixer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1122047A1 (en) * 2000-01-31 2001-08-08 Rabaud Improvements on a bucket mixer
FR2958865A1 (en) * 2010-04-20 2011-10-21 Emily Ets MIXER AND / OR DISPENSER BUCKET
EP2380655A1 (en) * 2010-04-20 2011-10-26 Etablissements Emily Mixing and/or distributing bucket and mixing method
CN108818926A (en) * 2018-07-25 2018-11-16 徐州徐工养护机械有限公司 A kind of stabilized soil mixing plant stirring blade
CN113441454A (en) * 2021-06-21 2021-09-28 常州都铂高分子有限公司 Raw materials belt cleaning device is used in aqueous binder production
CN113441454B (en) * 2021-06-21 2022-02-15 常州都铂高分子有限公司 Raw materials belt cleaning device is used in aqueous binder production

Also Published As

Publication number Publication date
ITTO950024U1 (en) 1996-08-03
ATE242094T1 (en) 2003-06-15
IT235773Y1 (en) 2000-07-18
EP0724940A3 (en) 1997-03-19
ES2090003T1 (en) 1996-10-16
DE69628476T2 (en) 2004-04-29
EP0724940B1 (en) 2003-06-04
DE69628476D1 (en) 2003-07-10
ES2090003T3 (en) 2004-03-16
ITTO950024V0 (en) 1995-02-03

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