EP0943408A1 - A mixing device, in particular for preparing concrete or the like - Google Patents
A mixing device, in particular for preparing concrete or the like Download PDFInfo
- Publication number
- EP0943408A1 EP0943408A1 EP98830146A EP98830146A EP0943408A1 EP 0943408 A1 EP0943408 A1 EP 0943408A1 EP 98830146 A EP98830146 A EP 98830146A EP 98830146 A EP98830146 A EP 98830146A EP 0943408 A1 EP0943408 A1 EP 0943408A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- disk
- container
- mixing device
- mixed
- respect
- 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
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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
- B28C5/1825—Mixers of the tilted-drum type, e.g. mixers pivotable about an axis perpendicular to the axis of rotation for emptying
- B28C5/1856—Details or parts, e.g. drums
- B28C5/1862—Construction of drum, e.g. provided with mixing blades
Definitions
- the present invention relates to a mixing device, in particular for preparing concrete or the like.
- Mixing devices can be classified in mixers with fixed or movable casing.
- the present invention relates specifically to a mixing device with movable casing, according to the preamble of claim 1.
- Mixing devices with movable casing of the more common type present a rotatable motorized container having an open mouth for charging the products to be mixed, sometimes used also for discharging the mixed product by inclinating the container.
- a rotatable motorized container having an open mouth for charging the products to be mixed, sometimes used also for discharging the mixed product by inclinating the container.
- formations for entraining the product to be mixed are fixed to the container.
- the present invention has the object to provide a mixing device which is simple, with the least possible number of components and which has an improved mixing capacity with respect to the conventional mixers.
- a mixing device intended in particular for the preparation of concrete or the like is indicated at 10.
- the device 10 comprises a container 12 rotatable about its axis 14.
- the container 12 has a bottom wall 16 and a lateral wall 18 which in the example shown in the figures has a cylindrical shape, whose axis is coincident with the axis of rotation 14.
- the end of the cylindrical wall 18 opposite to the bottom wall 16 is open, so as to form a charging mouth 20.
- a support 22 fixed to the output shaft of a geared motor assembly 24 which is carried by a stationary base 26.
- the geared motor assembly drives in rotation the container 12 about the axis 14.
- the axis of rotation 14 is preferably arranged with an inclination ⁇ with respect to a vertical direction (figure 2) which is comprised approximately between 20° and 36°.
- An idle mixing disk is placed within the container 12 and is free to rotate about its axis of symmetry 30.
- the disk 28 is carried by a support arm 32 placed outside the container 12 and connected to the stationary base 26, for example by means of a pair of parallel flanges 34.
- the support arm 32 has preferably a bracket configuration and carries at its free end a hub 36 on which the disk 28 is mounted.
- the disk 28 is contained in a plane which is inclined with respect to a horizontal plane of an angle comprised between 0° and 20°.
- the support arm 32 could be provided with an adjustment mechanism of any known type, adapted to permit a regulation of the angle of inclination of the disk 28.
- the disk 28 could be in an invariable position and means could be provided for adjusting the position of the container 12.
- the container 12 could also be overturned to permit a rapid discharge of the mixed product. Adjustment of the relative angular position between the disk and the axis of rotation of the container could be advantageous for adapting the device to the characteristics of the product which is intended to be mixed.
- this adjustment is not indispensable and in the simplest embodiment of the device according to the present invention the disk 28 and the container 12 are in an invariable relative position.
- the container 12 presents an upper section and a lower section.
- the disk 28 is placed substantially tangent to the internal wall of the upper section of the container 12.
- the inclined disposition of the disk 28 is such that the diagonal 38 formed by the interception of the plane of the disk with the plane of figure 2 is inclined upwardly in the direction which goes from the wall toward the centre of the container 12.
- the zone of the disk 28 placed towards the centre of the container 12, indicated at H is at a level with respect to the ground which is higher with respect to the lower point of the mouth 20, indicated at K.
- the rotation of the container 12 about the axis 14 imparts to the material to be mixed a rotation about the same axis. Since a part of the disk 28 is immerged in the material in movement, the disk 28 is brought into rotation about its axis 30 by the friction contact with the moving material. In order to increase the entrainment action of the disk 28 by the material, the disk 28 could by provided with an entrainment blade 40 fixed to the disk 28 and projecting from the lower surface of the latter. The entrainment blade 40 is preferably inclined with respect to the axis of rotation 30 of the disk 28 and is placed so that it does not interfere with the walls of the container 12.
- the material to be mixed is maintained in movement by the rotation of the container 12 and entrain in rotation the disk 28 about the axis 30.
- the upper surface of the disk 28 collects therefore a certain quantity of material in the zone wherein the disk is immerged in the material to be mixed.
- the rotation of the disk transports the material collected on the upper surface of the disk above the level L.
- the material placed on the upper surface of the disk 28 is intended to fall beyond the edge of the disk in the zones wherein the disk is raised with respect to the level L of the material to be mixed. This continuos action of raising and falling from above of the material produces a mixing action much more efficient than the one which is obtained only with the rotation of the container 12.
- the material can be discharged from the device 10 by placing a channel-shaped chute 42 below the disk 28.
- the channel-shaped chute 42 extends above the lowest point K of the container 12 and is carried by a support structure which is not shown in the figures.
- the channel-shaped chute 42 is removed during mixing and is inserted below the disk 28 only when the mixing is over and it is necessary to evacuate the mixed material.
- a part of the material which is raised above the level L by virtue of the rotation of the disk 28 falls on the chute 42 and flows downwardly outside the container 12 where it is collected for the subsequent use.
- the device according to the present invention could be modified in various way with respect to the embodiment disclosed and illustrated.
- the container 12 could have a different shape since the cylindrical profile of the lateral wall is not essential for carrying out the invention.
Landscapes
- 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)
- Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
Abstract
Description
- The present invention relates to a mixing device, in particular for preparing concrete or the like.
- Mixing devices can be classified in mixers with fixed or movable casing. The present invention relates specifically to a mixing device with movable casing, according to the preamble of claim 1.
- Mixing devices with movable casing of the more common type present a rotatable motorized container having an open mouth for charging the products to be mixed, sometimes used also for discharging the mixed product by inclinating the container. Within the rotatable container are generally provided formations for entraining the product to be mixed, which are fixed to the container.
- The present invention has the object to provide a mixing device which is simple, with the least possible number of components and which has an improved mixing capacity with respect to the conventional mixers.
- According to the present invention, this object is achieved by a device having the features forming the subject of the claims.
- The device according to the invention will now be described in detail with reference to the annexed drawings, given purely by way of non-limiting example, wherein:
- figure 1 is a schematic perspective view of a mixing device according to the present invention,
- figure 2 is a side elevation view of the device of figure 1, wherein the container has been sectioned,
- figure 3 is a view according to arrow III of figure 2, and
- figure 4 is a perspective view from a different angle of the device of figure 1.
- With reference to the figures, a mixing device intended in particular for the preparation of concrete or the like is indicated at 10.
- The
device 10 comprises acontainer 12 rotatable about itsaxis 14. Thecontainer 12 has abottom wall 16 and alateral wall 18 which in the example shown in the figures has a cylindrical shape, whose axis is coincident with the axis ofrotation 14. The end of thecylindrical wall 18 opposite to thebottom wall 16 is open, so as to form a chargingmouth 20. - As shown in figure 2, on the external side of the
bottom wall 16 of thecontainer 12 is located asupport 22 fixed to the output shaft of a gearedmotor assembly 24 which is carried by astationary base 26. The geared motor assembly drives in rotation thecontainer 12 about theaxis 14. The axis ofrotation 14 is preferably arranged with an inclination α with respect to a vertical direction (figure 2) which is comprised approximately between 20° and 36°. - An idle mixing disk is placed within the
container 12 and is free to rotate about its axis ofsymmetry 30. Thedisk 28 is carried by asupport arm 32 placed outside thecontainer 12 and connected to thestationary base 26, for example by means of a pair ofparallel flanges 34. Thesupport arm 32 has preferably a bracket configuration and carries at its free end ahub 36 on which thedisk 28 is mounted. - The
disk 28 is contained in a plane which is inclined with respect to a horizontal plane of an angle comprised between 0° and 20°. Thesupport arm 32 could be provided with an adjustment mechanism of any known type, adapted to permit a regulation of the angle of inclination of thedisk 28. In alternative, thedisk 28 could be in an invariable position and means could be provided for adjusting the position of thecontainer 12. Thecontainer 12 could also be overturned to permit a rapid discharge of the mixed product. Adjustment of the relative angular position between the disk and the axis of rotation of the container could be advantageous for adapting the device to the characteristics of the product which is intended to be mixed. However, this adjustment is not indispensable and in the simplest embodiment of the device according to the present invention thedisk 28 and thecontainer 12 are in an invariable relative position. - In order to define the relative position of the
disk 28 with respect to thecontainer 12 it is convenient to imaginary devide thecontainer 18 with a plane passing for the axis ofrotation 14 and orthogonal to the plane of a representation of figure 2. In this way, thecontainer 12 presents an upper section and a lower section. Thedisk 28 is placed substantially tangent to the internal wall of the upper section of thecontainer 12. The inclined disposition of thedisk 28 is such that the diagonal 38 formed by the interception of the plane of the disk with the plane of figure 2 is inclined upwardly in the direction which goes from the wall toward the centre of thecontainer 12. Furthermore, the zone of thedisk 28 placed towards the centre of thecontainer 12, indicated at H, is at a level with respect to the ground which is higher with respect to the lower point of themouth 20, indicated at K. In this way, a part of thedisk 28 will always the above the level of the material to be mixed, since this level could never exceed the level of point K. In figure 2 it is indicated at L a generic level of the material to be mixed contained in thecontainer 12. The disposition of thedisk 28 is such that in operation the part of thedisk 28 adjacent to the wall of thecontainer 12 is immerged in the material to be mixed while the part of thedisk 28 placed towards the centre of thecontainer 12 is above the level L. - In operation, the rotation of the
container 12 about theaxis 14 imparts to the material to be mixed a rotation about the same axis. Since a part of thedisk 28 is immerged in the material in movement, thedisk 28 is brought into rotation about itsaxis 30 by the friction contact with the moving material. In order to increase the entrainment action of thedisk 28 by the material, thedisk 28 could by provided with anentrainment blade 40 fixed to thedisk 28 and projecting from the lower surface of the latter. Theentrainment blade 40 is preferably inclined with respect to the axis ofrotation 30 of thedisk 28 and is placed so that it does not interfere with the walls of thecontainer 12. - As stated above, the material to be mixed is maintained in movement by the rotation of the
container 12 and entrain in rotation thedisk 28 about theaxis 30. The upper surface of thedisk 28 collects therefore a certain quantity of material in the zone wherein the disk is immerged in the material to be mixed. - The rotation of the disk transports the material collected on the upper surface of the disk above the level L. The material placed on the upper surface of the
disk 28 is intended to fall beyond the edge of the disk in the zones wherein the disk is raised with respect to the level L of the material to be mixed. This continuos action of raising and falling from above of the material produces a mixing action much more efficient than the one which is obtained only with the rotation of thecontainer 12. - At the end of the mixing treatment, the material can be discharged from the
device 10 by placing a channel-shaped chute 42 below thedisk 28. The channel-shaped chute 42 extends above the lowest point K of thecontainer 12 and is carried by a support structure which is not shown in the figures. The channel-shaped chute 42 is removed during mixing and is inserted below thedisk 28 only when the mixing is over and it is necessary to evacuate the mixed material. A part of the material which is raised above the level L by virtue of the rotation of thedisk 28 falls on thechute 42 and flows downwardly outside thecontainer 12 where it is collected for the subsequent use. - The device according to the present invention could be modified in various way with respect to the embodiment disclosed and illustrated. For example, the
container 12 could have a different shape since the cylindrical profile of the lateral wall is not essential for carrying out the invention.
Claims (7)
- A mixing device, in particular for preparing concrete or the like, comprising a rotatable and motorized container (12) having a charging mouth (20), characterized in that it comprises an idle disk (14) arranged within the container (12) so that in use it is in part above and in part below the level (L) of the material that be mixed.
- A mixing device according to claim 1, characterized in that the disk (28) is contained in a plane inclined with respect to a horizontal plane of an angle comprised between 0° and 20°
- A mixing device according to claim 1, characterized in that the axis of rotation (14) of the container (12) is inclined with respect to a vertical direction of an angle approximately comprised between 20° and 36°.
- A mixing device according to claim 3, characterized in that the container (12) has a bottom wall (16) fixed to a support (22) connected to the output shaft of a geared motor assembly (24) carried by a stationary support base (26).
- A mixing device according to claim 4, characterized in that said disk (28) is mounted in a freely rotatable way at the end of an arm (22) carried by said stationary support base (26).
- A mixing device according to claim 1, characterized in that it comprises an entrainment blade (40) fixed to the disk (28) and projecting from the surface thereof facing in the container (12).
- A mixing device according to claim 1, characterized in that it comprises a chute (42) for evacuating the mixed product, arranged in an inclined position below a zone (H) of the disk (28) and above a zone (K) of the mouth (20).
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT98830146T ATE202030T1 (en) | 1998-03-16 | 1998-03-16 | MIXING DEVICE FOR CONCRETE, IN PARTICULAR |
DE69800921T DE69800921T2 (en) | 1998-03-16 | 1998-03-16 | Mixing device for concrete, in particular |
ES98830146T ES2159931T3 (en) | 1998-03-16 | 1998-03-16 | Mixing device, in particular for preparing concrete or similar |
EP98830146A EP0943408B1 (en) | 1998-03-16 | 1998-03-16 | A mixing device, in particular for preparing concrete or the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98830146A EP0943408B1 (en) | 1998-03-16 | 1998-03-16 | A mixing device, in particular for preparing concrete or the like |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0943408A1 true EP0943408A1 (en) | 1999-09-22 |
EP0943408B1 EP0943408B1 (en) | 2001-06-13 |
Family
ID=8236574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98830146A Expired - Lifetime EP0943408B1 (en) | 1998-03-16 | 1998-03-16 | A mixing device, in particular for preparing concrete or the like |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0943408B1 (en) |
AT (1) | ATE202030T1 (en) |
DE (1) | DE69800921T2 (en) |
ES (1) | ES2159931T3 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB248658A (en) * | 1925-10-01 | 1926-03-11 | Ormerod Mitchell | Improvements in and relating to mixing machines and the like |
GB333492A (en) * | 1929-02-16 | 1930-08-14 | Jules Weitz Fils De | Improvements in rotary concrete and the like mixing machines |
DE510548C (en) * | 1930-10-20 | Fritz Moser | Inclined mixer | |
GB638766A (en) * | 1947-12-09 | 1950-06-14 | Winget Ltd | Improvements in machines for mixing concrete and other materials |
FR1143532A (en) * | 1953-11-20 | 1957-10-02 | Fixed pallet for concrete mixer with tilting tank |
-
1998
- 1998-03-16 EP EP98830146A patent/EP0943408B1/en not_active Expired - Lifetime
- 1998-03-16 AT AT98830146T patent/ATE202030T1/en not_active IP Right Cessation
- 1998-03-16 ES ES98830146T patent/ES2159931T3/en not_active Expired - Lifetime
- 1998-03-16 DE DE69800921T patent/DE69800921T2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE510548C (en) * | 1930-10-20 | Fritz Moser | Inclined mixer | |
GB248658A (en) * | 1925-10-01 | 1926-03-11 | Ormerod Mitchell | Improvements in and relating to mixing machines and the like |
GB333492A (en) * | 1929-02-16 | 1930-08-14 | Jules Weitz Fils De | Improvements in rotary concrete and the like mixing machines |
GB638766A (en) * | 1947-12-09 | 1950-06-14 | Winget Ltd | Improvements in machines for mixing concrete and other materials |
FR1143532A (en) * | 1953-11-20 | 1957-10-02 | Fixed pallet for concrete mixer with tilting tank |
Also Published As
Publication number | Publication date |
---|---|
DE69800921T2 (en) | 2001-11-08 |
ES2159931T3 (en) | 2001-10-16 |
EP0943408B1 (en) | 2001-06-13 |
DE69800921D1 (en) | 2001-07-19 |
ATE202030T1 (en) | 2001-06-15 |
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