EP3328529A1 - Sand mixing device and method of mixing sand - Google Patents
Sand mixing device and method of mixing sandInfo
- Publication number
- EP3328529A1 EP3328529A1 EP15767268.4A EP15767268A EP3328529A1 EP 3328529 A1 EP3328529 A1 EP 3328529A1 EP 15767268 A EP15767268 A EP 15767268A EP 3328529 A1 EP3328529 A1 EP 3328529A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixing
- central
- peripheral
- sand
- tool
- 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
Links
- 238000002156 mixing Methods 0.000 title claims abstract description 529
- 239000004576 sand Substances 0.000 title claims abstract description 177
- 238000000034 method Methods 0.000 title claims description 28
- 230000002093 peripheral effect Effects 0.000 claims abstract description 202
- 238000011144 upstream manufacturing Methods 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 120
- 238000005265 energy consumption Methods 0.000 description 18
- 238000012360 testing method Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000011236 particulate material Substances 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 241000896693 Disa Species 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
- B22C5/044—Devices having a vertical stirrer shaft in a fixed receptacle
-
- 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
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
- B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
-
- 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
- B01F27/23—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis
- B01F27/232—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes
- B01F27/2321—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes having different inclinations, e.g. non parallel
-
- 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
- B01F27/61—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis about an inclined axis
-
- 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
- B01F27/82—Pan-type mixers, i.e. mixers in which the stirring elements move along the bottom of a pan-shaped receptacle
-
- 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
- B01F35/752—Discharge mechanisms with arrangements for converting the mechanism from mixing to discharging, e.g. by either guiding a mixture back into a receptacle or discharging it
Definitions
- the present invention relates to a sand mixing device having a mixing bowl which is arranged stationarily on a support frame and includes a peripheral side wall and a bot- torn wall, a central mixing tool being arranged rotatably about a central mixer axis of the mixing bowl and having a number of blades extending along the bottom wall to the peripheral side wall, and at least one peripheral mixing tool being arranged rotatably about a peripheral mixer axis.
- a sand mixing device of the above-mentioned type is available under the trade name DISA TM Mixer.
- DE 39 01 774 discloses a weighing mixer particularly suitable for bulk material, such as synthetic granulate.
- the mixer has a cylindrical vessel with a steeply inclined lower base part which facilitates easy emptying of the vessel through an outlet inserted without dead space.
- a mixing tool is arranged rotatably about an axis displaced in relation to the cylinder axis of the cylindrical vessel. This kind of mixer is less suitable for sand mixing in a foundry.
- FR 1.271.334 discloses another mixer having a steeply inclined mixing vessel and a helical mixing tool arranged non-centrally and close to a cylindrical wall of the mixing vessel.
- EP 0 125 389 discloses an apparatus for treating materials which are capable of flow, comprising a mixing container which rotates about its central axis which is inclined with respect to the vertical, with a wall and/or bottom scraper plate which is arranged substantially stationarily with respect to the cylindrical inside wall of the mixing container, a discharge opening disposed in the bottom of the mixing container and one or two non- centrally arranged rotating tools which engage into the material.
- the mixing container is driven at a sub-critical speed of rotation, the rotating tool is arranged exclusively at the downstream side of the apex, that the space on the upstream side is free of fittings therein and that the scraper plate is disposed in the vicini- ty of the apex of the mixing container.
- an outer stationary shield is necessary which may complicate the filling and emptying operations and sample takings.
- the object of the present invention is to provide a sand mixing device of the type men- tioned by way of introduction, whereby process cycle time and energy consumption may be reduced.
- the mixing bowl is arranged in an inclined position on the support frame so that the central mixer axis of the mixing bowl is inclined at an angle to the vertical, a first cross-sectional plane extending through the mixing bowl and including both the central mixer axis and a horizontal line extending in a plane defining the bottom wall divides the mixing bowl into a lower part positioned relatively lower and a higher part positioned relatively higher, and at least one peripheral mixing tool is arranged in the lower part of the mixing bowl.
- the combination of the inclined mixing bowl and the positioning of at least one peripheral mixing tool in the lower part of the mixing bowl has proven to provide both more efficient mixing and lower energy consumption so that mixing time and energy consumption may be reduced at the same time.
- a further beneficial effect of the inclined mixing bowl is that emptying of the mixing vessel may be performed faster. The total effect is therefore that a substantially reduced process cycle time and a substantially reduced energy consumption may be achieved.
- test results have revealed that the inclined mixing bowl in itself, although providing reduced energy consumption, does not provide an improved mixing result without also positioning at least one peripheral mixing tool in the lower part of the mixing bowl.
- test results have revealed that the reduced energy consumption obtained by the inclined mixing bowl may be boosted by positioning at least one peripheral mixing tool in the lower part of the mixing bowl. Therefore, it may be concluded that according to the present invention, a surprising synergistic effect may be achieved.
- the central mixer axis of the mixing bowl is inclined at an angle of between 5 and 30 degrees, preferably of between 7 and 25 degrees, more preferred of between 8 and 20 degrees, and most preferred of between 9 and 15 degrees to the vertical.
- the synergistic effect according to the invention of the inclined mixing bowl and the positioning of the peripheral mixing tools in the lower part of the mixing bowl may be optimized.
- the blades of the central mixing tool are distributed evenly about the central mixer axis of the mixing bowl, neighbouring blades thereby forming a certain mutual angle, and the at least one peripheral mixing tool is arranged so that the mutual angle between any pair of peripheral mixing tools is different from an integer multiple of the certain mutual angle of the neighbouring blades of the central mixing tool.
- tests have proven that if two blades of the central mixing tool during rotation simultaneously pass a respective one of the peripheral mixing tools, an undesirable counter-phase effect may cause increased energy consumption.
- the tests have further proven that by means of said arrangement of the at least one peripheral mixing tool in combination with the inclined mixing bowl, such undesirable counter- phase effect may be reduced or avoided in such a way that the energy consumption may be reduced without influencing the mixing efficiency negatively, so that mixing time is not increased.
- said arrangement of the at least one peripheral mixing tool without an inclined mixing bowl may reduce energy consumption, but at the same time reduce mixing efficiency, so that the mixing time would have to be prolonged. In fact, the total effect of this would be longer mixing time and higher energy consumption. It may therefore be concluded that a synergistic effect may be achieved by the combined effect of said arrangement of the at least one peripheral mixing tool and an inclined mixing bowl.
- the at least one peripheral mixing tool is arranged so that the mutual angle between any pair of peripheral mixing tools differs more than 3 per cent, preferably more than 5 per cent, and most preferred more than 7 per cent, from an integer multiple of the certain mutual angle of the neighbouring blades of the central mixing tool.
- the sand mixing device includes a first peripheral mixing tool being arranged rotatably about a first peripheral mixer axis at a first angular mixer position about the central mixer axis of the mixing bowl and a second peripheral mixing tool being arranged rotatably about a second peripheral mixer axis at a second angular mixer position about the central mixer axis of the mixing bowl, and the first and the second peripheral mixing tools are arranged in the lower part of the mixing bowl.
- This embodiment may be more efficient for relatively larger mixers.
- the central mixing tool includes four blades distributed evenly about the central mixer axis of the mixing bowl, neighbouring blades thereby forming a mutual angle of 90 degrees, and the first and the second peripheral mixing tools are arranged so that the first and second angular mixer positions differ by between 73 and 87 degrees, preferably by between 78 and 85 degrees, and most preferred by between 82 and 84 degrees.
- the above- mentioned undesirable counter-phase effect may be reduced or avoided efficiently, and therefore, the energy consumption may be reduced efficiently.
- an even number of blades on the central mixing tool may be advantageous in that transverse forces in the central mixing tool may be avoided so that only moment is present.
- the central mixing tool is adapted to rotate sand in the mixing bowl in a main rotational direction, thereby defining an upstream and a downstream direc- tion in the mixing bowl
- the first peripheral mixing tool is located upstream in relation to the second peripheral mixing tool
- the first angular mixer position differs from an angular position of the first cross-sectional plane by between 10 and 55 degrees, preferably by between 20 and 45 degrees, and most preferred by between 30 and 35 degrees.
- the first peripheral mixing tool is arranged higher than the second peripheral mixing tool in relation to the bottom wall of the mixing bowl.
- the central mixing tool is adapted to rotate in a main rotational direction
- the at least one peripheral mixing tool is adapted to rotate in a rotational direction opposite to the main rotational direction
- the central mixing tool is adapted to rotate in a main rotational direction
- each blade of the central mixing tool extends from a central hub to a free end at the peripheral side wall of the mixing bowl, each blade curves from the central hub in a rotational direction opposite to the main rotational direction, and the free end of each blade is provided with a blade tip having an upper face slanting towards the bottom wall of the mixing bowl in the main rotational direction.
- the respective peripheral mixer axes seen in respective radial cross-sectional views of the mixing bowl, form respective angles with the central mixer axis of at least 2 degrees, preferably at least 3 degrees, and most preferred at least 4 degrees, so that the lower ends of the peripheral mixing tools, respectively, are at least slightly pointed towards the central mixer axis.
- the peripheral side wall is rotationally symmetric, such as composed by conical and/or cylindrical sections, about its central mixer axis, and wherein the central mixer axis is perpendicular to the bottom wall.
- the peripheral side wall is a cylindrical wall
- the bottom wall is arranged at right angles to the cylindrical wall
- the central mixer axis of the peripheral side wall is a cylinder axis of the cylindrical wall.
- a second cross-sectional plane through the mixing bowl including the central mixer axis and extending at right angles to the first cross-sectional plane defines a lowest point angular position in the lower part of the mixing bowl and a highest point angular position in the higher part of the mixing bowl, and an outlet port is arranged in the peripheral side wall, next to the bottom wall, at the lowest point angular position.
- the sand mixing device is controlled to empty the mixing bowl by opening the outlet port, rotating the central mixing tool and at least substantially reducing the rotational speed of or stopping the first and second peripheral mixing tools.
- the central mixing tool is provided with a central conical top part covering the upper end of a central mixing shaft on which the central mixing tool is mounted.
- the efficiency of the sand mixing device may be improved in that circulation of sand in the mixing bowl may be facilitated so that sand moved downward at the central part of the mixing bowl may slide down on the central conical top part and thereby be guided outwards to the blades of the central mixing tool at the bottom wall of the mixing bowl.
- the mixing bowl is provided with a horizontal top cover in which a sand feed hopper is arranged.
- the sand feed hopper may be arranged in different angular orientations about a vertical axis according to requirements, without inclining the sand feed hopper in relation to the horizontal plane.
- a mounting opening in the horizontal top cover is adapted to the sand feed hopper so that the sand feed hopper may be arranged in at least four different angular orientations about a vertical axis.
- the sand feed hopper may in an easy way be arranged in different angular orientations about a vertical axis according to requirements.
- each peripheral mixing tool is driven by a respective direct drive motor arranged on the horizontal top cover by means of a respective intermediate flange piece arranged on the horizontal top cover and having a respective motor connection flange adapted to the respective angle of the peripheral mixer axis.
- the mixing bowl is provided with an oblique top cover arranged below the horizontal top cover, each peripheral mixing tool is driven by a respective direct drive motor arranged on the oblique top cover by means of a respective intermediate flange piece arranged on the oblique top cover and having a respective motor connection flange adapted to the respective angle of the respective peripheral mixer axis.
- the present invention further relates to a method of mixing sand in a mixing bowl which is maintained stationarily on a support frame and includes a peripheral side wall and a bottom wall, whereby a central mixing tool is rotated about a central mixer axis of the mixing bowl and has a number of blades extending to the peripheral side wall and swiping over the bottom wall, and whereby at least one peripheral mixing tool is rotated about a peripheral mixer axis.
- the method is characterised by that the mixing bowl is maintained in an inclined position on the support frame so that the central mixer axis of the mixing bowl is inclined at an angle to the vertical, by that a first cross-sectional plane extending through the mixing bowl and including both the central mixer axis and a horizontal line extending in a plane defining the bottom wall divides the mixing bowl into a lower part positioned relatively lower and a higher part positioned relatively higher, and by that at least one pe- ripheral mixing tool is rotated in the lower part of the mixing bowl.
- the central mixer axis of the mixing bowl is inclined at an angle of between 5 and 30 degrees, preferably of between 7 and 25 degrees, more preferred of between 8 and 20 degrees, and most preferred of between 9 and 15 degrees to the vertical.
- two blades of the central mixing tool do not simultaneously pass two respective peripheral mixer axes of a pair of peripheral mixing tools.
- the angular position about the central mixer axis of any other blade of the central mixing tool is not nearer than 3 degrees, preferably not nearer than 4 degrees, more preferred not nearer than 5 degrees and most preferred not nearer than 6 degrees, to a peripheral mixer axis of another peripheral mixing tool.
- a first peripheral mixing tool is rotated about a first peripheral mixer axis at a first angular mixer position about the central mixer axis of the mixing bowl and a second peripheral mixing tool is rotated about a second peripheral mixer axis at a second angular mixer position about the central mixer axis of the mixing bowl, and the first and the second peripheral mixing tools are rotated in the lower part of the mix- ing bowl.
- the central mixing tool rotates sand in the mixing bowl in a main rotational direction, thereby defining an upstream and a downstream direction in the mixing bowl, the first peripheral mixing tool meets sand upstream in relation to the second peripheral mixing tool, and the first angular mixer position differs from an angular position of the first cross-sectional plane by between 10 and 55 degrees, preferably by between 20 and 45 degrees, and most preferred by between 30 and 35 degrees.
- the first peripheral mixing tool is arranged higher than the second peripheral mixing tool in relation to the bottom wall of the mixing bowl.
- the central mixing tool rotates in a main rotational direction
- the at least one peripheral mixing tool rotate in a rotational direction opposite to the main rotational direction.
- the central mixing tool rotates in a main rotational direction
- each blade of the central mixing tool extends from a central hub to a free end at the peripheral side wall of the mixing bowl, each blade curves from the central hub in a rotational direction opposite to the main rotational direction, and the free end of each blade is provided with a blade tip lifting sand in upward direction in relation to the bottom wall of the mixing bowl.
- the respective peripheral mixer axes seen in respective radial cross-sectional views of the mixing bowl, form respective angles with the central mixer axis of at least 2 degrees, preferably at least 3 degrees, and most preferred at least 4 degrees, so that the lower ends of the peripheral mixing tools, respectively, are at least slightly pointed towards the central mixer axis.
- the peripheral side wall is rotationally symmetric, such as composed by conical and/or cylindrical sections, about its central mixer axis, and wherein the central mixer axis is perpendicular to the bottom wall.
- the peripheral side wall is a cylindrical wall
- the bottom wall is arranged at right angles to the cylindrical wall
- the central mixer axis of the peripheral side wall is a cylinder axis of the cylindrical wall.
- the mixing bowl is emptied by opening the outlet port, rotating the central mixing tool and at least substantially reducing the rotational speed of or stopping the first and second peripheral mixing tools.
- the central mixing tool is provided with a central conical top part covering the upper end of a central mixing shaft on which the central mixing tool is mounted, and sand moves downward at the central part of the mixing bowl and slides down on the central conical top part and thereby is guided outwards to the blades of the central mixing tool at the bottom wall of the mixing bowl.
- the mixing bowl is provided with a horizontal top cover in which a sand feed hopper is arranged.
- a mounting opening in the horizontal top cover is adapted to the sand feed hopper so that the sand feed hopper may be arranged in at least four different angular orientations about a vertical axis.
- each peripheral mixing tool is driven by a respective direct drive motors arranged on the horizontal top cover by means of a respective intermediate flange piece arranged on the horizontal top cover and having a respective motor connection flange adapted to the respective angle of the peripheral mixer axis.
- the mixing bowl is provided with an oblique top cover arranged below the horizontal top cover, each peripheral mixing tool is driven by a respective direct drive motor arranged on the oblique top cover by means of a respective intermediate flange piece arranged on the oblique top cover and having a respective motor connection flange adapted to the respective angle of the respective peripheral mixer axis.
- Fig. 1 is a top view of a sand mixing device according to the present invention, seen obliquely from above in the direction of a central mixer axis, whereby the sand feed hopper has been removed;
- Fig. 2 is a cross-section through a part of the sand mixing device along the line ll-ll in Fig. 1 ;
- Fig. 3 is a radial cross-section through a part of the sand mixing device along the line Ill-Ill in Fig. 1 ;
- Fig. 4 is a side view of another embodiment of the sand mixing device in Fig. 1 ;
- Fig. 5 is a perspective view of another embodiment of the sand mixing device in Fig. 1 ;
- Fig. 6 is a partly cross-sectional side view of an embodiment of the sand mixing device; illustrating a sand feed hopper arranged in a first position;
- Fig. 7 is a top view of the sand mixing device in Fig. 6 illustrating a sand feed hopper arranged in a first position;
- Fig. 8 is a partly cross-sectional side view of an embodiment of the sand mixing device; illustrating a sand feed hopper arranged in a second position;
- Fig. 9 is a top view of the sand mixing device in Fig. 8 illustrating a sand feed hopper arranged in a second position;
- Fig. 10 is a top view of the central mixing tool of the sand mixing device in Figs. 1 to 3;
- Fig. 1 1 is a partly cross-sectional side view of the central mixing tool in Fig. 10;
- Fig. 12 is a graphical representation of the power consumption for a prior art sand mixing device;
- Fig. 13 is a graphical representation of the power consumption for a sand mixing device according to the present invention.
- Fig. 2 illustrates a sand mixing device 1 having a mixing bowl 2 which is arranged stationarily on a support frame 3 and includes a peripheral side wall 4 and a bottom wall 5.
- a central mixing tool 6 is arranged rotatably about a central mixer axis 7 of the mixing bowl 2 and has four blades 8 extending along the bottom wall 5 to the peripheral side wall 4.
- a first peripheral mixing tool 9 is arranged rotatably about a first peripheral mixer axis 10 at a first angular mixer position Pi about the central mixer axis 7 of the mixing bowl 2.
- the first angular mixer position is located in the cross-section illustrated in Fig. 3.
- a second peripheral mixing tool 1 1 is arranged rotatably about a second peripheral mixer axis 12 at a second angular mixer position P2 about the central mixer axis 7 of the mixing bowl 2.
- the second angular mixer position is located in the cross- section illustrated in Fig. 2.
- the mixing bowl 2 is arranged in an inclined position on the support frame 3 so that the central mixer axis 7 of the mixing bowl is inclined at an angle M to the vertical.
- the angle M is approximately 8 degrees.
- the angle M may according to the invention be between 5 and 30 degrees, preferably between 7 and 25 degrees, more preferred between 8 and 20 degrees, and most preferred between 9 and 15 degrees.
- the support frame 3 is provided with not shown feet or the like adapted to position the support frame 3 on a horizontal- ly extending floor so that the mixing bowl 2 is inclined at said angle M to the vertical.
- Fig. 1 is a top view of the sand mixing device 1 according to the present invention, seen obliquely from above in the direction of the central mixer axis 7.
- Fig. 1 illustrates a first cross-sectional plane 13 extending through the mixing bowl 2 and including both the central mixer axis 7 and a not shown horizontal line extending in a plane defining the bottom wall 5.
- the first cross-sectional plane 13 divides the mixing bowl 2 into a lower part 14 positioned relatively lower and a higher part 15 positioned relatively higher.
- the first and the second peripheral mixing tools 9, 1 1 are arranged in the lower part 14 of the mixing bowl 2.
- the central mixing tool 6 includes four blades 8 distributed evenly about the central mixer axis 7 of the mixing bowl 2. Neighbouring blades 8 thereby form a mutual angle of 90 degrees.
- the first and second peripheral mixing tools 9, 1 1 are arranged so that the first and second angular mixer positions differ by an angle P12 of approximately 83 degrees.
- the first and the second peripheral mixing tools 9, 11 may be arranged so that the first and second angular mixer positions differ by an angle P12 of between 73 and 87 degrees, preferably by between 78 and 85 degrees, and most preferred by between 82 and 84 degrees.
- Tests have proven that if two blades 8 of the central mixing tool 6 during rotation simultaneously or almost simultaneously pass a respective one of the peripheral mixing tools 9, 1 1 , an undesirable counter-phase effect may cause increased energy consumption.
- the first and the second peripheral mixing tools 9, 11 in combination with the inclined mixing bowl 2 such undesirable counter-phase effect may be reduced or avoided in such a way that the energy consumption may be reduced without influencing the mixing efficiency negatively, so that mixing time is not increased.
- the central mixing tool 6 may include other numbers of blades 8 distributed evenly about the central mixer axis 7 so that neighbouring blades form a certain mutual angle.
- the first and the second peripheral mixing tools 9, 1 1 are arranged so that the first and second angular mixer positions Pi , P2 differ by an angle P12 that is different from an integer multiple of the certain mutual angle of the neighbouring blades 8 of the central mixing tool 6.
- a greater number of peripheral mixing tools is arranged, such as three, four or even more peripheral mixing tools, these are arranged so that the mutual angle between any pair of peripheral mixing tools is different from an integer multiple of the certain mutual angle of the neighbouring blades of the central mixing tool.
- the peripheral mixing tools are arranged so that the mutual angle between any pair of peripheral mixing tools differs more than 3 per cent, preferably more than 5 per cent, and most preferred more than 7 per cent, from an integer multiple of the certain mutual angle of the neighbouring blades of the central mixing tool.
- the above-mentioned undesirable counter-phase effect may be substantially reduced or avoided.
- the central mixing tool 6 is adapted to rotate sand in the mixing bowl 2 in a main rotational direction R, thereby defining an upstream and a downstream direction in the mixing bowl 2.
- the first peripheral mixing tool 9 is located upstream in relation to the second peripheral mixing tool 12.
- the first angular mixer position Pi is between 10 and 55 degrees, preferably between 20 and 45 degrees, and most preferred between 30 and 35 degrees.
- the first angular mixer position Pi is 32 degrees
- the second angular mixer position P2 is 115 degrees.
- the first peripheral mixing tool 9 is arranged higher than the second peripheral mixing tool 1 1 in relation to the bottom wall 5 of the mixing bowl 2.
- the central mixing tool 6 is adapted to rotate in the main rotational direction R, and the first and second peripheral mixing tools 9, 1 1 are adapted to rotate in a rotational direction r opposite to the main rotational direction R.
- the main rotational direction R is counter clockwise.
- the central mixing tool 6 is adapted to rotate in the main rotational direction R, and as illustrated in Fig. 10, each blade 8 of the central mixing tool 6 extends from a central hub 16 to a free end 17 at the peripheral side wall 4 of the mixing bowl 2 so that each blade 8 curves from the central hub 16 in a rotational direction opposite to the main rotational direction R.
- two opposed blades 8 together makes an S-formed configuration.
- each blade 8 is provided with a blade tip 18 having an upper face 49 slanting towards the bottom wall 5 of the mixing bowl 2 in the main rotational direction R.
- the blade tips may lift sand in upward direction in relation to the bottom wall 5 of the mixing bowl 2.
- the first and second peripheral mixer axes 10, 1 1 as seen in Figs. 3 and 2 in the respective radial cross-sectional views of the mixing bowl 2, form respective angles m with the central mixer axis, so that the lower ends of the first and second peripheral mixing tools 10, 1 1 , respectively, are at least slightly pointed towards the central mixer axis 7.
- the respective angles m equal 5 degrees; however, generally, according to the present invention, the angles may be at least 2 degrees, preferably at least 3 degrees, and most preferred at least 4 degrees.
- the peripheral side wall 4 of the mixing bowl 2 is a cylin- drical wall
- the bottom wall is arranged at right angles to the cylindrical wall
- the central mixer axis 7 of the peripheral side wall 4 and of the mixing bowl 2 is a cylinder axis of the cylindrical wall.
- the peripheral side wall 4 is rotationally symmetric, such as composed by conical and/or cylindrical sections, about its central mixer axis 7.
- the central mixer axis 7 is prefera- bly perpendicular to the bottom wall 5.
- Fig. 1 further illustrates a second cross-sectional plane 19 extending through the mixing bowl 2, including the central mixer axis 7 and extending at right angles to the first cross-sectional plane 13.
- the second cross-sectional plane 19 defines a lowest point angular position I_P of the bottom wall 5 in the lower part 14 of the mixing bowl 2 and a highest point angular position HP of the bottom wall 5 in the higher part 15 of the mixing bowl 2.
- An outlet port 20 is arranged in the peripheral side wall 4, next to the bottom wall 5, at the lowest point angular position Lp.
- the sand mixing device 1 is controlled to, subsequent to sand mixing, empty the mixing bowl 2 by opening the outlet port 20, rotating the cen- tral mixing tool 6 and at least substantially reducing the rotational speed of or stopping the first and second peripheral mixing tools 9, 11.
- Rotation of the central mixing tool 6 may facilitate the emptying operation, whereas rotation of the first and/or the second peripheral mixing tool 9, 1 1 in some circumstances may slow down the emptying op- eration.
- the central mixing tool 6 is provided with a central conical top part 22 covering the upper end of a central mixing shaft 23 on which the central mixing tool 6 is mounted.
- a central conical top part 22 covering the upper end of a central mixing shaft 23 on which the central mixing tool 6 is mounted.
- the central mixing tool 6 is driven by means of a drive motor 46 via an angular gearbox 47.
- the mixing bowl 2 is provided with a horizontal top cover 24 in which a sand feed hopper 25 also denoted a batch hopper is arranged. It is noted that in Figs.
- a mounting opening 26 is adapted to fit a substantially rectangular bottom part of the sand feed hopper 25 so that the sand feed hopper 25 may be ar- ranged in at least four different angular orientations about a vertical axis.
- the orientation of the sand feed hopper 25 may conveniently be adapted to the position of a sand conveyor adapted to fill sand into the sand feed hopper 25.
- the sand feed hopper 25 has been rotated 90 degrees about said vertical axis in relation to the configuration illustrated in Figs. 6 and 7.
- the mounting opening 26 may have different forms in order to fit the sand feed hopper 25 so that the sand feed hopper 25 may be rotated to be mounted in different positions.
- the mounting opening 26 is at least substantially square-formed.
- the bottom part of the sand feed hopper 25 is circular, and the corresponding mounting opening 26 is circular.
- the sand feed hopper 25 is in a well-known way provided with three not shown weighing cells. When the required weight of sand has been achieved in the sand feed hopper 25, this is detected by the weighing cells, and a bottom door of the sand feed hopper 25 is opened by means of a pneumatic cylinder so that the sand is fed into the sand mixing device 1.
- the sand mixing device 1 is furthermore provided with a not shown water supply including a water tank large enough to contain the amount re- quired for at least one batch operation of the sand mixing device, for instance 100 litres.
- the water tank is also provided with a number of weighing cells so that the weight of water present in the water tank may be weighed continuously as the water is supplied from the tank to the mixing bowl 2.
- a relatively large amount of water such as 90 kilogrammes, estimated to be almost enough for the required humidity of the sand, is filled into the mixing bowl via a relatively large control valve. This is preferably done simultaneously with the sand filling operation. This relatively large amount of water may for instance be supplied to the mixing bowl within 15 seconds.
- the relatively large control valve may provide fast water filling.
- the sand humidity in the mixing bowl 2 is measured and a required additional sand weight is calculated.
- a relatively small amount of water such as 4 kilogrammes, estimated to be enough for the required humidity of the sand, is filled into the mixing bowl via a relatively small control valve.
- the relatively small control valve may provide precision.
- each peripheral mixing tool 9, 11 is driven by a respective direct drive motor 27, 28 arranged on the horizontal top cover 24 by means of a respective intermediate flange piece 29, 30 arranged on the horizontal top cover 24 and having a respective motor connection flange 31 , 32 adapted to the respective angle of the respective peripheral mixer axis 10, 12.
- the direct drive motors 27, 28 are relatively compact compared to prior art belt drives, this arrangement facilitates the above-mentioned design of the sand feed hopper 25 whereby the sand feed hopper 25 may be arranged in different angular orientations about a vertical axis.
- the direct drive motors provide for easier maintenance than belt drives.
- the mixing bowl 2 is provided with an oblique top cover 33 arranged below the horizontal top cover 24.
- Each peripheral mixing tool 9, 11 is driven by a respective direct drive motor 27, 28 arranged on the oblique top cover 33 by means of a respective intermediate flange piece 34, 35 arranged on the oblique top cover 33 and having a respective motor connection flange 36, 37 adapted to the respective angle of the respective peripheral mixer axis 10, 12.
- Each peripheral mixing tool 9, 1 1 is connected to the respective drive motor 27, 28 by means of a respective flexible coupling 38.
- Figs. 12 and 13 illustrate simulated comparative test results regarding power consumption for sand mixing devices having a mixing capacity of approximately 3000 kil- ogrammes per batch.
- Fig. 13 is a graphical representation of the power consumption for the sand mixing device 1 according to the present invention as illustrated in Figs. 1 to 3.
- Fig. 12 is a corresponding graphical representation of the power consumption for a prior art sand mixing device corresponding in size and sand mixing capacity to the sand mixing device 1 illustrated in Figs. 1 to 3 and having a corresponding central mixing tool, but having a mixing bowl arranged vertically so that the central mixer axis is vertical, and having two peripheral mixing tools arranged diametrically opposed in relation to the central mixer axis.
- the central mixing tool of both tested sand mixing devices rotated at approximately 26 rpm.
- the peripheral mixing tools of the prior art device rotated at approximately 1200 rpm
- the peripheral mixing tools of the sand mixing device 1 according to the present invention rotated at approximately 1000 rpm.
- the first angular mixer position Pi is 32 degrees
- the first and second angular mixer positions differ by an angle P12 of approximately 83 degrees
- the mixing bowl is inclined at an angle M of approximately 8 degrees to the vertical
- the first and second peripheral mixer axes 10, 11 form respective angles m of approximately 5 degrees with the central mixer axis 7.
- the peripheral mixer axes of the peripheral mixing tools of the prior art device form respective angles of approximately 2 degrees with the central mixer axis.
- Fig. 12 illustrates the power consumption of the central mixing tool by means of the curve 39 and the average thereof by means of the line 40. Furthermore, Fig. 12 illustrates the power consumption of one of the peripheral mixing tools by means of the curve 41 and the average thereof by means of the line 42.
- Fig. 12 it is seen that in the prior art sand mixing device, the central mixing tool consumes an average of approximately 140 kilowatt, and the two peripheral mixing tools consume a total average of approximately 115 kilowatt (each peripheral mixing tool consumes slightly less than 60 kilowatt). This makes a total average power consump- tion for the prior art sand mixing device of approximately 255 kilowatt.
- Fig. 13 illustrates the power consumption of the central mixing tool 6 by means of the curve 43. Furthermore, Fig. 13 illustrates the power consumption of the first peripheral mixing tool 9 by means of the curve 44 and the power consumption of the second pe- ripheral mixing tool 1 1 by means of the curve 45.
- the central mixing tool 6 consumes an average of approximately 130 kilowatt
- the two peripheral mixing tools 9, 11 consume a total average of approximately 100 kilowatt (each peripheral mixing tool consumes approximately 50 kilowatt). This makes a total average power consumption for the sand mixing device 1 according to the present invention of approximately 230 kilowatt.
- a result of the simulated comparative test is that the sand mixing device 1 according to the present invention consumes 10 per cent less power than the prior art sand mixing device.
- the mixing time required to achieve a satisfactory mixing result was also reduced from the prior art sand mixing device to the sand mixing device 1 according to the present invention.
- the prior art sand mixing device requires 120 seconds of mixing to obtain a satisfactory result
- the sand mixing device 1 according to the present invention only requires 110 seconds.
- the sand mixing device 1 may perform the sand and water filling operation in approximately 10 seconds which is generally faster than standard prior art procedures which depend on tap pressure in that water is simply supplied from a tap.
- the sand mixing device 1 may perform the emptying operation in approximately 20 seconds compared to approximately 30 seconds for the prior art sand mixing de- vice.
- the total batch processing time for the sand mixing device 1 according to the present invention may be reduced by at least 10 to 15 per cent compared to the prior art sand mixing device.
- the sand or particulate material may typically be so-called green sand (also called clay bound sand), i.e. moulding material based on quartz sand, clay, coal dust and water. Howev- er, other particulate materials and binder systems may be applied.
- peripheral mixing tool (prior art mixing device)
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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PL15767268T PL3328529T3 (en) | 2015-07-29 | 2015-07-29 | Sand mixing device and method of mixing sand |
Applications Claiming Priority (1)
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PCT/IB2015/055719 WO2017017497A1 (en) | 2015-07-29 | 2015-07-29 | Sand mixing device and method of mixing sand |
Publications (2)
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EP3328529A1 true EP3328529A1 (en) | 2018-06-06 |
EP3328529B1 EP3328529B1 (en) | 2019-07-10 |
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EP15767268.4A Active EP3328529B1 (en) | 2015-07-29 | 2015-07-29 | Sand mixing device and method of mixing sand |
Country Status (4)
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EP (1) | EP3328529B1 (en) |
CN (1) | CN108136349A (en) |
PL (1) | PL3328529T3 (en) |
WO (1) | WO2017017497A1 (en) |
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CN111005710B (en) * | 2019-12-19 | 2022-03-18 | 中石化四机石油机械有限公司 | Sand conveying and mixing system and control method |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1271334A (en) | 1960-09-21 | 1961-09-08 | Buss Ag | Method and device for mixing, kneading and kneading powdered or granular materials |
US3770251A (en) * | 1971-11-08 | 1973-11-06 | F Herfeld | Apparatus for mixing plastics materials and the like during processing thereof |
DE2318692B1 (en) * | 1973-04-13 | 1974-08-08 | Badische Maschinenfabrik Gmbh, 7500 Karlsruhe | Mixer for molding sand |
NL7807794A (en) * | 1978-07-20 | 1978-11-30 | Nautamix Patent Ag | Mixing device for liquid and solid phases - employs gas injection to fluidise mix and reduce agitator load |
DE3312869A1 (en) | 1983-04-09 | 1984-10-11 | Eirich, Hubert | DEVICE FOR SPREADING FLOWABLE MATERIALS |
DE3341674C2 (en) * | 1983-11-18 | 1986-11-27 | Alwin Berents GmbH & Co KG, 2805 Stuhr | Device for mixing and homogenizing preferably pasty material to be mixed |
DD266465A3 (en) * | 1987-08-12 | 1989-04-05 | Giesserei Anlagenbau Und Gusse | DEVICE FOR MIXING |
DE3901774C2 (en) | 1989-01-21 | 1995-03-30 | Mann & Hummel Filter | Mixer with a mixing container, especially for bulk goods |
WO2002074467A1 (en) * | 2001-03-20 | 2002-09-26 | Nv Engineering Gmbh | Method and device for the cooling preparation of warm bulk materials |
JP3521192B2 (en) * | 2001-04-10 | 2004-04-19 | 川崎重工業株式会社 | Continuous granulator and continuous granulation method |
JP2011115731A (en) * | 2009-12-04 | 2011-06-16 | Central Motor Co Ltd | Stirring device unit in container |
CN204365166U (en) * | 2014-12-29 | 2015-06-03 | 四川省祥业机械铸造有限公司 | A kind of coating agitator |
-
2015
- 2015-07-29 EP EP15767268.4A patent/EP3328529B1/en active Active
- 2015-07-29 PL PL15767268T patent/PL3328529T3/en unknown
- 2015-07-29 WO PCT/IB2015/055719 patent/WO2017017497A1/en unknown
- 2015-07-29 CN CN201580082021.5A patent/CN108136349A/en active Pending
Also Published As
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WO2017017497A1 (en) | 2017-02-02 |
PL3328529T3 (en) | 2020-01-31 |
EP3328529B1 (en) | 2019-07-10 |
CN108136349A (en) | 2018-06-08 |
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