EP1182021A2 - Mechanical mixer, in particular for granular or powder material - Google Patents
Mechanical mixer, in particular for granular or powder material Download PDFInfo
- Publication number
- EP1182021A2 EP1182021A2 EP00204711A EP00204711A EP1182021A2 EP 1182021 A2 EP1182021 A2 EP 1182021A2 EP 00204711 A EP00204711 A EP 00204711A EP 00204711 A EP00204711 A EP 00204711A EP 1182021 A2 EP1182021 A2 EP 1182021A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- corridor
- chamber
- mixing
- mixing chamber
- 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- Withdrawn
Links
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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
- B28C5/18—Mixing in containers to which motion is imparted to effect the mixing
- B28C5/20—Mixing in containers to which motion is imparted to effect the mixing rotating about a horizontal or substantially horizontal axis during mixing, e.g. without independent stirrers
- B28C5/2045—Parts or components
- B28C5/2054—Drums, e.g. provided with non-rotary mixing blades
- B28C5/2063—Drums consisting of axially displaceable halves; Drums having discharging opening on their cylindrical part, e.g. the drum rotating in opposite direction for mixing or for discharging; Drums having a cylindrical part not being a surface of revolution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
- B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
- B01F35/75485—Discharge mechanisms characterised by the means for discharging the components from the mixer the mixing receptacle rotating in opposite directions for mixing and for discharging
-
- 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
- B28C5/141—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 with container tiltable or elevatable for emptying
Definitions
- This invention relates to a mechanical mixer, in particular for granular or powder material; a typical application is in the preparation of material to be pressed in moulds, to form ceramic tiles.
- Mechanical mixers comprising a container enclosing a mixing chamber having a cylindrical wall of horizontal or nearly horizontal axis, and means for rotating the container about said axis, the material being mixed within the chamber of the rotating container, in particular with the aid of suitable mixing means, and possibly with the addition of liquid substances.
- the mixer of the invention is of the type comprising means for evacuating the mixed material during rotation of the mixer, so that the treated material has already been evacuated from the mixing chamber when the end of the mixing cycle is reached.
- An object of this invention is to provide a mixer able to effect particularly effective and rapid motorized or even automatic discharge of the residual material or even of the entire load of mixed material, using extremely simple and economical means.
- Figure 1 is a general view of the mixer to which the invention is applied.
- FIG. 2 is an enlarged detail of Figure 1, to illustrate the invention.
- Figure 3 is a section on the plane III-III of Figure 2.
- Figures 4A, 4B and 4C show the section of Figure 3 in three successive significant angular positions during a stage in the mixing of the material.
- Figures 5A, 5B and 5C show the section of Figure 3 during a stage in the emptying of the material from the chamber.
- the mixer of the invention comprises a container 10 enclosing a mixing chamber 11 having a cylindrical wall 12, the axis A of which is horizontal or nearly horizontal.
- cylindrical wall 12 means any wall in the form of a surface of rotation, of axis A; in particular, said wall 12 can be frusto-conical or of barrel shape.
- the container 10 possesses a first closed vertical end 21 to which a duct 13 of zig-zag axis is rigidly fixed, for exit of the material from the chamber 11.
- the container 10 and the duct 13 are rotated rigidly about the axis A; for this purpose they both rest on pairs of wheels 14, which provide a support for their rolling about the axis A.
- a toothed wheel 15 is provided rigid with the duct 13, coaxial with A, to be rotated by a geared motor 17 via a transmission chain 16.
- the material to be mixed is fed into the chamber 11 through a stationary inlet 18 positioned on that vertical end 22 opposite the first end 21 in which the exit duct 13 is located.
- the second flat end 22 of the container 10 has a wide aperture closed by a fixed plate 23, which is coupled to the end 22 via gaskets acting by sliding.
- the container 10 is rotated about its axis A, by rolling on the wheels 14; the fed material is mixed within its chamber 11 by means of said rotation.
- Various members can be provided in the chamber 11 to intervene during the mixing; for example, in Figure 1 rotating members are shown schematically in Figure 1, operated by a geared motor 191.
- the mixed material leaves the chamber 11 automatically through the duct 13, as a result of the rotation of the duct 13 simultaneously with the rotation of the container 10.
- a corridor 30, extending along an arc of the cross-section of the wall 12, and having a relatively small constant radial dimension (defining the thickness of the corridor) and an axial dimension (defining the width of the corridor) which at a first end equals the entire axial dimension of the mixing chamber 11.
- Said corridor possesses a first end 30' closed against the outside environment and communicating with the mixing chamber 11 via a passage aperture 31 provided in the cylindrical wall 12.
- the corridor also possesses a second end 30" having a mouth 32 open towards the outside environment.
- the corridor 30 extends through an arc of length such that, when the passage aperture 31 encounters the material contained in the mixing chamber 11, the second end 30" lies at a level higher than the level attained by the material which enters the corridor 30; in particular, it lies at a level higher than the level of the material contained in the chamber 11 itself.
- the container 10 is rotated in the direction from the second end 30" towards the first end 30' to discharge the material from the chamber 11 via said corridor 30, and in the opposite direction during the mixing stage.
- the container is rotated in the direction from the first end 30' towards the second end 30" (in the anticlockwise direction in the figures).
- the aperture 31 is encountered by the material M contained in the chamber 11, part of the material M penetrates through it by gravity into the corridor 30; however the mouth 32 of the corridor lies at a level higher than the level of M and, more to the point, at a level higher than the level of the material M' which has penetrated into the corridor 30 (because this material not only cannot exceed the level of M, but because of friction during its travel is normally lower than the level of M); consequently the material M' does not leave from the mouth 32 (as illustrated in Figure 4A).
- the container 10 is rotated in the opposite direction (clockwise), i.e. in the direction from the second end 30" towards the first end 30'.
- the aperture 31 reaches the residual material R contained in the chamber 11, the material R penetrates into the corridor 30 through this aperture by gravity.
- the second end 30" descends with respect to the first end 30' and the corridor 30 becomes increasingly filled with material R' originating from the chamber 11 ( Figure 5B).
- the material R' contained in the corridor 30 is discharged completely through the mouth 32, to the outside of the chamber 11.
- the invention can be used to completely discharge the entire material processed in the chamber 11.
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 And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
Description
- This invention relates to a mechanical mixer, in particular for granular or powder material; a typical application is in the preparation of material to be pressed in moulds, to form ceramic tiles.
- Mechanical mixers are known comprising a container enclosing a mixing chamber having a cylindrical wall of horizontal or nearly horizontal axis, and means for rotating the container about said axis, the material being mixed within the chamber of the rotating container, in particular with the aid of suitable mixing means, and possibly with the addition of liquid substances.
- Typically, the mixer of the invention is of the type comprising means for evacuating the mixed material during rotation of the mixer, so that the treated material has already been evacuated from the mixing chamber when the end of the mixing cycle is reached.
- Each time the mixer is required to mix material of different characteristics than the material which was last mixed, not only must the previous material be evacuated, but all residual material must also be removed if the subsequent material is not to be contaminated by the preceding material. In particular, if the material to be mixed is changed with relatively high frequency, said emptying operations result in considerable loss of time, in addition to having to be carried out manually.
- An object of this invention is to provide a mixer able to effect particularly effective and rapid motorized or even automatic discharge of the residual material or even of the entire load of mixed material, using extremely simple and economical means.
- This and further objects are attained by the invention as characterised in the claims.
- The invention is described in detail hereinafter with the aid of the accompanying figures, which illustrate one embodiment thereof by way of non-limiting example.
- Figure 1 is a general view of the mixer to which the invention is applied.
- Figure 2 is an enlarged detail of Figure 1, to illustrate the invention.
- Figure 3 is a section on the plane III-III of Figure 2.
- Figures 4A, 4B and 4C show the section of Figure 3 in three successive significant angular positions during a stage in the mixing of the material.
- Figures 5A, 5B and 5C show the section of Figure 3 during a stage in the emptying of the material from the chamber.
- The mixer of the invention comprises a
container 10 enclosing amixing chamber 11 having acylindrical wall 12, the axis A of which is horizontal or nearly horizontal. - The term "cylindrical wall" 12 means any wall in the form of a surface of rotation, of axis A; in particular, said
wall 12 can be frusto-conical or of barrel shape. - The
container 10 possesses a first closedvertical end 21 to which aduct 13 of zig-zag axis is rigidly fixed, for exit of the material from thechamber 11. - The
container 10 and theduct 13 are rotated rigidly about the axis A; for this purpose they both rest on pairs ofwheels 14, which provide a support for their rolling about the axis A. - According to the embodiment shown in the figures, a
toothed wheel 15 is provided rigid with theduct 13, coaxial with A, to be rotated by a gearedmotor 17 via atransmission chain 16. - The material to be mixed is fed into the
chamber 11 through astationary inlet 18 positioned on thatvertical end 22 opposite thefirst end 21 in which theexit duct 13 is located. - The second
flat end 22 of thecontainer 10 has a wide aperture closed by afixed plate 23, which is coupled to theend 22 via gaskets acting by sliding. - The
container 10 is rotated about its axis A, by rolling on thewheels 14; the fed material is mixed within itschamber 11 by means of said rotation. Various members (of known type) can be provided in thechamber 11 to intervene during the mixing; for example, in Figure 1 rotating members are shown schematically in Figure 1, operated by a gearedmotor 191. - According to the embodiment shown in the figures, the mixed material leaves the
chamber 11 automatically through theduct 13, as a result of the rotation of theduct 13 simultaneously with the rotation of thecontainer 10. - According to the invention, to discharge residual material from the rotating
container 10, on the outer surface of thecylindrical wall 12 there is provided acorridor 30, extending along an arc of the cross-section of thewall 12, and having a relatively small constant radial dimension (defining the thickness of the corridor) and an axial dimension (defining the width of the corridor) which at a first end equals the entire axial dimension of themixing chamber 11. - Said corridor possesses a first end 30' closed against the outside environment and communicating with the
mixing chamber 11 via apassage aperture 31 provided in thecylindrical wall 12. The corridor also possesses asecond end 30" having amouth 32 open towards the outside environment. - The
corridor 30 extends through an arc of length such that, when thepassage aperture 31 encounters the material contained in themixing chamber 11, thesecond end 30" lies at a level higher than the level attained by the material which enters thecorridor 30; in particular, it lies at a level higher than the level of the material contained in thechamber 11 itself. - Finally according to the invention, the
container 10 is rotated in the direction from thesecond end 30" towards the first end 30' to discharge the material from thechamber 11 via saidcorridor 30, and in the opposite direction during the mixing stage. - In detail, during the mixing stage (illustrated in Figures 4A, 4B and 4C) the container is rotated in the direction from the first end 30' towards the
second end 30" (in the anticlockwise direction in the figures). When theaperture 31 is encountered by the material M contained in thechamber 11, part of the material M penetrates through it by gravity into thecorridor 30; however themouth 32 of the corridor lies at a level higher than the level of M and, more to the point, at a level higher than the level of the material M' which has penetrated into the corridor 30 (because this material not only cannot exceed the level of M, but because of friction during its travel is normally lower than the level of M); consequently the material M' does not leave from the mouth 32 (as illustrated in Figure 4A). As thecontainer 10 continues its rotation, thesecond end 30" climbs increasingly higher with respect to the first end 30', hence the material M' lying within thecorridor 30 does not leave from themouth 32 but indeed returns by gravity into thechamber 11 through the aperture 31 (Figure 4B). Finally, thecorridor 30 reaches the position (Figure 4C) in which theaperture 31 exceeds the level of the material M and all the material M' is discharged back into thechamber 11. - Consequently none of the material M is discharged out of the
chamber 11 through thecorridor 30. To evacuate any residue R from thechamber 11, thecontainer 10 is rotated in the opposite direction (clockwise), i.e. in the direction from thesecond end 30" towards the first end 30'. When theaperture 31 reaches the residual material R contained in thechamber 11, the material R penetrates into thecorridor 30 through this aperture by gravity. As rotation proceeds, thesecond end 30" descends with respect to the first end 30' and thecorridor 30 becomes increasingly filled with material R' originating from the chamber 11 (Figure 5B). Finally, with thesecond end 30" moving downwards, the material R' contained in thecorridor 30 is discharged completely through themouth 32, to the outside of thechamber 11. - In practice, with just a few revolutions of the
container 10 in the clockwise direction, all residue is discharged from thechamber 11. This is achieved automatically without it being necessary to open and reclose doors or the like. - In addition to discharging the residue, the invention can be used to completely discharge the entire material processed in the
chamber 11. - Numerous modifications of a practical and applicational nature can be made to the invention, but without departing from the scope of the inventive idea as claimed below.
Claims (2)
- A mechanical mixer, comprising:a container (10) enclosing a mixing chamber (11) having a cylindrical wall (12), the axis (A) of which is horizontal or nearly horizontal,means for rotating the container (10) in both directions about said axis (A),mixing of the material being carried out within said mechanical (11) of the container,a corridor (30) which, provided on the outer surface of the cylindrical wall (12), extends through an arc of the cross-section of the wall (12), and has a first end (30') communicating with the mixing chamber (11) via a passage aperture (31) provided in the cylindrical wall, and a second end (30") open towards the outside environment,said corridor (30) having a length such that, when said passage aperture (31) of the first end (30') is encountered by the material contained in the mixing chamber (11), the second end (30") lies at a level higher than the level of the material which enters the corridor (30),the container (10) being rotated in the direction from the second end (30") towards the first end (30') to discharge material from the chamber (11) via said corridor (30), and in the opposite direction during the mixing stage.
- A mixer as claimed in claim 1, characterised in that said corridor (30) has a relatively small constant radial dimension and an axial dimension which at a first end (30') equals virtually the entire axial dimension of the mixing chamber (11).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2000RE000076A IT1318353B1 (en) | 2000-07-27 | 2000-07-27 | MECHANICAL MIXER, IN PARTICULAR FOR GRANULAR OR DUSTY MATERIAL. |
ITRE200076 | 2000-07-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1182021A2 true EP1182021A2 (en) | 2002-02-27 |
EP1182021A3 EP1182021A3 (en) | 2003-07-09 |
Family
ID=11453951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00204711A Withdrawn EP1182021A3 (en) | 2000-07-27 | 2000-12-22 | Mechanical mixer, in particular for granular or powder material |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1182021A3 (en) |
IT (1) | IT1318353B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102500274A (en) * | 2011-12-22 | 2012-06-20 | 江苏牧羊集团有限公司 | Method for reducing material residues in mixer |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1576678A (en) * | 1924-03-28 | 1926-03-16 | Thomas W Shaw | Cement mixer |
DE539752C (en) * | 1929-12-11 | 1931-12-02 | Usines De Thisselt Lez Willebr | Mixing device for mortar, concrete or the like. |
AU5135169A (en) * | 1969-03-03 | 1970-09-03 | Angus Cameron William | An improved rotating drum mixer |
FR2644709A1 (en) * | 1989-03-24 | 1990-09-28 | Commissariat Energie Atomique | MIXER COMPRISING A SPIRAL ROTATING ROTOR |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1428446A1 (en) * | 1986-01-24 | 1988-10-07 | Н.С.Фещенко, Л.Ф.Ивец, Л.И.Арабаджи и Л.М.Иванов | Mixer |
-
2000
- 2000-07-27 IT IT2000RE000076A patent/IT1318353B1/en active
- 2000-12-22 EP EP00204711A patent/EP1182021A3/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1576678A (en) * | 1924-03-28 | 1926-03-16 | Thomas W Shaw | Cement mixer |
DE539752C (en) * | 1929-12-11 | 1931-12-02 | Usines De Thisselt Lez Willebr | Mixing device for mortar, concrete or the like. |
AU5135169A (en) * | 1969-03-03 | 1970-09-03 | Angus Cameron William | An improved rotating drum mixer |
FR2644709A1 (en) * | 1989-03-24 | 1990-09-28 | Commissariat Energie Atomique | MIXER COMPRISING A SPIRAL ROTATING ROTOR |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Section Ch, Week 198925 Derwent Publications Ltd., London, GB; Class J02, AN 1989-184851 XP002235773 & SU 1 428 446 A (FESHCHENKO N S), 7 October 1988 (1988-10-07) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102500274A (en) * | 2011-12-22 | 2012-06-20 | 江苏牧羊集团有限公司 | Method for reducing material residues in mixer |
Also Published As
Publication number | Publication date |
---|---|
ITRE20000076A1 (en) | 2002-01-27 |
IT1318353B1 (en) | 2003-08-25 |
EP1182021A3 (en) | 2003-07-09 |
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