CA2255304A1 - Multiple drum mixing system - Google Patents
Multiple drum mixing system Download PDFInfo
- Publication number
- CA2255304A1 CA2255304A1 CA002255304A CA2255304A CA2255304A1 CA 2255304 A1 CA2255304 A1 CA 2255304A1 CA 002255304 A CA002255304 A CA 002255304A CA 2255304 A CA2255304 A CA 2255304A CA 2255304 A1 CA2255304 A1 CA 2255304A1
- Authority
- CA
- Canada
- Prior art keywords
- drum
- chamber
- hot air
- shroud
- air stream
- 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.)
- Abandoned
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
- E01C19/1027—Mixing in a rotary receptacle
- E01C19/1031—Mixing in a rotary receptacle the mixture being discharged continuously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/60—Mixing solids with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F29/00—Mixers with rotating receptacles
- B01F29/25—Mixers with rotating receptacles with material flowing continuously through the receptacles from inlet to discharge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F29/00—Mixers with rotating receptacles
- B01F29/40—Parts or components, e.g. receptacles, feeding or discharging means
- B01F29/403—Disposition of the rotor axis
- B01F29/4036—Disposition of the rotor axis with a plurality of rotating receptacles
- B01F29/40364—Disposition of the rotor axis with a plurality of rotating receptacles being concentrically arranged
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F29/00—Mixers with rotating receptacles
- B01F29/60—Mixers with rotating receptacles rotating about a horizontal or inclined axis, e.g. drum mixers
- B01F29/63—Mixers with rotating receptacles rotating about a horizontal or inclined axis, e.g. drum mixers with fixed bars, i.e. stationary, or fixed on the receptacle
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C2019/1081—Details not otherwise provided for
- E01C2019/1086—Mixing containers having concentric drums
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C2019/1081—Details not otherwise provided for
- E01C2019/1095—Mixing containers having a parallel flow drum, i.e. the flow of material is parallel to the gas flow
Abstract
A drying and mixing plant for particulate material is provided comprising an inner drum, a middle drum and an outer drum.
The drums are attached concentrically to form a substantially horizontal drum assembly with a first annular chamber between the inner and middle drums and a second annular chamber between the middle and outer drums, and are located such that a first particulate material discharged from the output end of the inner drum is received at a mid-point of the middle drum and is then carried to the output end of the middle drum and received by the input end of the outer drum and then carried through the second annular chamber to the output end of the outer drum and discharged from the drum assembly through a material outlet. Sources of hot air and injectors for asphalt or the like are also included.
The drums are attached concentrically to form a substantially horizontal drum assembly with a first annular chamber between the inner and middle drums and a second annular chamber between the middle and outer drums, and are located such that a first particulate material discharged from the output end of the inner drum is received at a mid-point of the middle drum and is then carried to the output end of the middle drum and received by the input end of the outer drum and then carried through the second annular chamber to the output end of the outer drum and discharged from the drum assembly through a material outlet. Sources of hot air and injectors for asphalt or the like are also included.
Description
Dec-08-96 09:47 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.06/31 F-F&K 275-09-O1 MULTIPLE DR><JM MIXING SYSTEM
s This invention deals with ,the field of mixing plants for aggregate and the like and in particular such a plant that employs an inner and an outer drum rotating together.
l0 H~ACKGROUND
Aggregate typically is sized into categories such as fine, medium and course, or some similar divisions. Different applications and uses of aggregate often require specific 1s proportions of different sized aggregate, which proportions are achieved by mixing aggregate from the different categories to achieve the proper and substantially uniform mix. As well, aggregate tends to segregate itself when handled, as the larger pieces roll to the sides of a pile. Mixing the Zo required proportions nearest the point of final use can be beneficial in maintaining the proper mix.
Dec-09-98 09:4T From-Furman 4 Kallio-Regina +1-306-359-6956 T-392 P.OT/31 F-In some instances, the properly proportioned aggregate mix is further mixed with another material. For example, to make asphalt for road paving, liquid asphalt is added to an aggregate mix, and sometimes there is the further addition of a proportion of recycled asphaltic material. Similarly, to make pre-mixed dry concrete, cement is added to an aggregate mix.
Single drum mixers are commonly used for such mixing, with the materials to be mixed introduced into one end and tumbled together as they pass through the drum. In addition to mixing the aggregate, it is usually desired to dry the aggregate as well. The drying is generally accomplished by directing a flow of heated air into the drum. Where moisture content of is different materials varies, it would be desirable to have one or more of the mix materials dried at a slower rate or heated to a different temperature than another mix material.
When exposed to high heat, liquid asphalt may be damaged and z0 the quality of asphalt may be reduced. Remo~ring the point at which asphalt is introduced into the mix from the direct path of the heated air improves the quality of asphalt produced.
Dec-09-99 09:41 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.OB/31 F-F&K 275'04-O1 A significant problem with such systems is that the fine material carried out With the air not only causes pollution, but the fines are also lost from the mix. These fines are material that has been conveyed into the mixer and dried. Any such material that does not go into the mix is a loss, and must be replaced with further aggregate material, at added cost.
Dual drum mixers are also known in the prior art. Prior U.S.
io Patent No. 4, 600, 379 to Elliot is directed to a mixer with concentric dual drums, as does U.S. Patent No. 4,262,429 to Avril. These devices are directed towards reduced energy use and pollutants such as fines or combustion gases.
~s A device which would provide more versatility with respect to adding, drying and heating the various components of a mix would be beneficial. Such a de~rice that also reduced the fines exhausted from the~mixer would be further advantageous.
io SUD~~QPrRY OE THE INVENTION
Dec-08-98 09:42 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.09/31 F-F&K 2'75-09-Ol It is an object of the present invention to provide a drying and mixing plant that provides improved selection of points for insertion of material into a mix and improved selection of drying rates through such selection.
It is a further object of the present invention to provide a drying and mixing plant that captures the fine aggregate material usually carried out of the plant by the exhaust air, for use and retention in the material mix, thereby also iu reducing the filtration capacity needed to remove these fines from the air.
The invention accomplishes these objects providing a drying and mixing plant for particulate material comprising an inner i5 drum, a middle drum and'an outer drum, each having an input end for receiving particulate material and an output end for discharging particulate material, said drums attached concentrically to form a substantially horizontal drum assembly having a top side and a bottom side, wherein said 2o drums rotate together, said assembly thereby forming a first annular chamber between said inner and middle drums and a second annular chamber between said middle and outer drums;
said drums located such that a first particulate material Dec-08-98 09:42 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.10/31 F-F&K 275-04-01 discharged from said output end of the inner drum is received at a mid-point of said middle drum and is then carried to said output end of the middle drum and received by said input end of the outer drum and carried through said second annular s chamber to said output end of the outer drum and discharged from said drum assembly through a material outlet; a drive operatively connected to said drum assembly and operative to rotate said drum assembly; a hot air source directing a hot air stream into said input end of the inner drum; a first io shroud enclosing said first annular chamber at said input end of the middle drum, said first shroud providing access for a second particulate material to enter said input end of the middle drum; a second shroud enclosing said second annular chamber at said output end~of the outer drum, said second is shroud providing access in the bottom thereof for particulate material to be discharged through said material outlet: a third shroud enclosing said input end of the outer drum said third shroud providing access for a third particulate material to enter said outer drum; an exhaust vent operatively 2o connected to one of said second or third shrouds for directing said hot air stream out of said drum assembly; and impellers mounted on the inner ,surface of each drum for moving particulate material along said drums and for lifting Dac-06-96 09:48 From-Furman 4 Kallio-Regina +1-306-359-6956 T-392 P.11/31 F-64t particulate material and dropping same to fall through said hot air stream: where in operation, particulate material travels in the same direction through said inner and middle drums, opposite to Lhe direction of travel of particulate material through said outer drum and said second annular chamber, all particulate material introduced into said drums thereby becoming mixed.
The disclosed mixer allows for insertion of different >lo materials at the input ends of each drum. Particulate materials such as aggregate or recycled asphalt could be sorted and put into the apparatus at the desired location.
First material introduced into the input end of the inner drum will be subject to the highest temperatures and fastest drying. Second material introduced into the input end of the middle drum will be carried first through the first chamber where it will be heated by radiant heat from the inner drum, and then will enter the path of the hot air stream and be mixed with the hotter first material from the inner drum. The i0 second material will not be exposed to the hot air stream as long as the first material, and will receive less drying.
This first mixed material will then be discharged into the outer drum and be carried in the opposite direction through Dec-09-99 09:48 From-Furman & Kallio-Regina +1-306-359-6956 T-392 P.12/31 F-F&K 275-04-Ol the second chamber to the material outlet.
A third material could be introduced into the input end of the outer drum and be mixed with the first mixed material to form s a second mixed material. This third material will receive even less drying as it i's exposed to heat for less time than the other materials.
The hot air stream may be directed out of the apparatus at the 1o input end of the outer drum, through the thixd shroud. The hot air stream then does not pass through the second chamber and the third material then receives heat only by radiant heat from the middle drum, and absorption of heat from the first mixed material. Alternatively the hot air stream may be is directed out of the apparatus at the output end of the outer drum, through the second shroud. The hot air stream then passes through the second chamber, and further dries and heats the second mixed material and thus the third material.
2o As well a material could be inserted somewhere along the second chamber between the middle and outer drums. This is most applicable to liquid materials which could be inserted through a conduit extending through the third shroud and Dac-06-96 09:48 From-Furman & Kallio-Regina +1-306-359-6956 T-392 P.13/31 F-F&K 275-OQ-O1 ending at the chosen location in the second chamber. For example, liquid asphalt, could be introduced at this point, with the hot air stream directed through the third shroud, thus substantially reducing the temperature in the second chamber and reducing damage to the asphalt.
With the exhaust vent operatively connected zo the second shroud, and the exhaust vent operatively connected to the top portion of the second shroud, the invention could further io comprise means to direct the hot air stream in the second chamber downwards towards the bottom of the second chamber as the hot air stream leaves the second chamber and enters the second shroud. The meahs could comprise an annular baffle attached to the exterior surface of the middle drum at a mid-is point of the middle drum, the baffle extending radially into said second chamber and directing the hot air stream towards the inner surface of the outer drum; and a semi-circular baffle attached to the second shroud and extending into the top portion of the second chamber, the baffle angled to direct 2o the hot air stream from the top side of the second chamber towards the bottom thereof.
Thus the hot air stream is forced to the bottom of the second Dec-09-96 09:48 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.14/31 F-E'&K 275-Q4-O1 shroud and must rise to the,top portion to enter the exhaust vent. More of the larger tines will then fall into the mix.
This effect can be accentuated if the airflow path through the second shroud and the exhaust vent has a cross-sectional area greater than the cross-sectional area of the second chamber, whereby the velocity of the hot air stream is reduced as the hot air stream exits the second chamber into the second shroud. Reducing the velocity of the hot air stream will allow more of the fines to settle out re-enter the mix.
~o A liquid material, such as liquid asphalt, could be introduced into the outer drum at a point inside the second chamber.
Moving the injection point down the second chamber somewhat would reduce the temperature that the asphalt is exposed to, i5 and reduce burning.
Further, the asphalt could be introduced through a plurality of nozzles oriented to direct a spray of liquid material across a majority of the cross-section of the second chamber.
The majority of the fines would pass through the spray and be 2o coated with asphalt, thereby becoming heavier and more likely to fall down into the mix.
The hot air stream thus passes through the second chamber Dec-09-96 09:46 From-Furman ~ Kallio-Regina +1-306-359-6956 T-39t P.15/31 F-F&K 275-04-O1 before exiting the drum assembly through the exhaust vent.
The second mixed material would be subjected to higher temperatures, and more drying. The annular baffle at the mid-point of the middle drum directs the hot air stream towards s the outer drum where it can be deflected by the semi-circular baffle would direct it down and into the mix.
DESCRIPTION OF THE DRAWINGS
While the invention is claimed in the concluding portions hereof, preferred embodiments are provided in the accompanying detailed description which may be best understood in conjunction with the accompanying diagrams where like parts in >-s each of the several diagrams are labeled with like numbers, and where:
Figure 1 is a cut-away side view of an embodiment for mixing asphalt and aggregate, with the exhaust vent ao located so that the hot air stream does not pass through the chamber between the middle and outer drums;
Dec-08-98 09:49 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.16/31 F-F&K 275-04-O1 Figure 2 is a cut-away side view of an embodiment for mixing asphalt and aggregate, with the exhaust vent located so that the hot air stream passes through the chamber between the middle and outer drums;
Figure 3 is an end view of the semi-circular baffle.
Figure 4 is an end view of the nozzle ring.
to DETAILED DLSCRIPTION OF THE ILLUSTRATED EL~ODIMENTS
Figure 1 shows one preferred embodiment of the invention. A
drying and mixing plant for particulate material comprises an is inner drum 1, a middle drum 2 and an outer drum 3, each having an input end la, 2a, 3a for receiving particulate material and an output end 1b, 2b, 3b for discharging particulate material.
The drums 1, 2 ands 3 are attached concentrically by drum brackets 4 to form a substantially horizontal drum assembly 5 ao having a top side Sa and a bottom side Sb. The drum assembly 5 is supported on the frame 6 at drive wheel 7 and support wheels 8. Drive wheel 7 is rotationally driven by motor 9, and Dac-08-98 09:49 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.11/31 F-F&K 275-09-O1 the drum assembly 5 is thereby rotated.
The drum assembly 5 forms a first annular chamber 10 between the inner and middle drums 1, 2 and a second annular chamber s 11 between the middle and outer drums 2, 3. The drums 1, 2 and 3 are located such that a first particulate material 20 (indicated by the circular "o" particles in the figures), introduced into the input end la of the inner drum 1 on first conveyor 17, and then dischargEd from the output end lb of the io inner drum 1 is received at a mid-point of the middle drum 2 and is then carried to the output end 2b of the middle drum 2 and received by the input end 3a of the outer drum 3 and carried through the second annular chamber 11 to the output end 3b of the outer drum 3 and discharged from the drum is assembly 5 through a material outlet 12. The direction of flow of the particulate material is dictated by the pitch on the impellers 13 located on the inner surface of the drums 1,
s This invention deals with ,the field of mixing plants for aggregate and the like and in particular such a plant that employs an inner and an outer drum rotating together.
l0 H~ACKGROUND
Aggregate typically is sized into categories such as fine, medium and course, or some similar divisions. Different applications and uses of aggregate often require specific 1s proportions of different sized aggregate, which proportions are achieved by mixing aggregate from the different categories to achieve the proper and substantially uniform mix. As well, aggregate tends to segregate itself when handled, as the larger pieces roll to the sides of a pile. Mixing the Zo required proportions nearest the point of final use can be beneficial in maintaining the proper mix.
Dec-09-98 09:4T From-Furman 4 Kallio-Regina +1-306-359-6956 T-392 P.OT/31 F-In some instances, the properly proportioned aggregate mix is further mixed with another material. For example, to make asphalt for road paving, liquid asphalt is added to an aggregate mix, and sometimes there is the further addition of a proportion of recycled asphaltic material. Similarly, to make pre-mixed dry concrete, cement is added to an aggregate mix.
Single drum mixers are commonly used for such mixing, with the materials to be mixed introduced into one end and tumbled together as they pass through the drum. In addition to mixing the aggregate, it is usually desired to dry the aggregate as well. The drying is generally accomplished by directing a flow of heated air into the drum. Where moisture content of is different materials varies, it would be desirable to have one or more of the mix materials dried at a slower rate or heated to a different temperature than another mix material.
When exposed to high heat, liquid asphalt may be damaged and z0 the quality of asphalt may be reduced. Remo~ring the point at which asphalt is introduced into the mix from the direct path of the heated air improves the quality of asphalt produced.
Dec-09-99 09:41 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.OB/31 F-F&K 275'04-O1 A significant problem with such systems is that the fine material carried out With the air not only causes pollution, but the fines are also lost from the mix. These fines are material that has been conveyed into the mixer and dried. Any such material that does not go into the mix is a loss, and must be replaced with further aggregate material, at added cost.
Dual drum mixers are also known in the prior art. Prior U.S.
io Patent No. 4, 600, 379 to Elliot is directed to a mixer with concentric dual drums, as does U.S. Patent No. 4,262,429 to Avril. These devices are directed towards reduced energy use and pollutants such as fines or combustion gases.
~s A device which would provide more versatility with respect to adding, drying and heating the various components of a mix would be beneficial. Such a de~rice that also reduced the fines exhausted from the~mixer would be further advantageous.
io SUD~~QPrRY OE THE INVENTION
Dec-08-98 09:42 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.09/31 F-F&K 2'75-09-Ol It is an object of the present invention to provide a drying and mixing plant that provides improved selection of points for insertion of material into a mix and improved selection of drying rates through such selection.
It is a further object of the present invention to provide a drying and mixing plant that captures the fine aggregate material usually carried out of the plant by the exhaust air, for use and retention in the material mix, thereby also iu reducing the filtration capacity needed to remove these fines from the air.
The invention accomplishes these objects providing a drying and mixing plant for particulate material comprising an inner i5 drum, a middle drum and'an outer drum, each having an input end for receiving particulate material and an output end for discharging particulate material, said drums attached concentrically to form a substantially horizontal drum assembly having a top side and a bottom side, wherein said 2o drums rotate together, said assembly thereby forming a first annular chamber between said inner and middle drums and a second annular chamber between said middle and outer drums;
said drums located such that a first particulate material Dec-08-98 09:42 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.10/31 F-F&K 275-04-01 discharged from said output end of the inner drum is received at a mid-point of said middle drum and is then carried to said output end of the middle drum and received by said input end of the outer drum and carried through said second annular s chamber to said output end of the outer drum and discharged from said drum assembly through a material outlet; a drive operatively connected to said drum assembly and operative to rotate said drum assembly; a hot air source directing a hot air stream into said input end of the inner drum; a first io shroud enclosing said first annular chamber at said input end of the middle drum, said first shroud providing access for a second particulate material to enter said input end of the middle drum; a second shroud enclosing said second annular chamber at said output end~of the outer drum, said second is shroud providing access in the bottom thereof for particulate material to be discharged through said material outlet: a third shroud enclosing said input end of the outer drum said third shroud providing access for a third particulate material to enter said outer drum; an exhaust vent operatively 2o connected to one of said second or third shrouds for directing said hot air stream out of said drum assembly; and impellers mounted on the inner ,surface of each drum for moving particulate material along said drums and for lifting Dac-06-96 09:48 From-Furman 4 Kallio-Regina +1-306-359-6956 T-392 P.11/31 F-64t particulate material and dropping same to fall through said hot air stream: where in operation, particulate material travels in the same direction through said inner and middle drums, opposite to Lhe direction of travel of particulate material through said outer drum and said second annular chamber, all particulate material introduced into said drums thereby becoming mixed.
The disclosed mixer allows for insertion of different >lo materials at the input ends of each drum. Particulate materials such as aggregate or recycled asphalt could be sorted and put into the apparatus at the desired location.
First material introduced into the input end of the inner drum will be subject to the highest temperatures and fastest drying. Second material introduced into the input end of the middle drum will be carried first through the first chamber where it will be heated by radiant heat from the inner drum, and then will enter the path of the hot air stream and be mixed with the hotter first material from the inner drum. The i0 second material will not be exposed to the hot air stream as long as the first material, and will receive less drying.
This first mixed material will then be discharged into the outer drum and be carried in the opposite direction through Dec-09-99 09:48 From-Furman & Kallio-Regina +1-306-359-6956 T-392 P.12/31 F-F&K 275-04-Ol the second chamber to the material outlet.
A third material could be introduced into the input end of the outer drum and be mixed with the first mixed material to form s a second mixed material. This third material will receive even less drying as it i's exposed to heat for less time than the other materials.
The hot air stream may be directed out of the apparatus at the 1o input end of the outer drum, through the thixd shroud. The hot air stream then does not pass through the second chamber and the third material then receives heat only by radiant heat from the middle drum, and absorption of heat from the first mixed material. Alternatively the hot air stream may be is directed out of the apparatus at the output end of the outer drum, through the second shroud. The hot air stream then passes through the second chamber, and further dries and heats the second mixed material and thus the third material.
2o As well a material could be inserted somewhere along the second chamber between the middle and outer drums. This is most applicable to liquid materials which could be inserted through a conduit extending through the third shroud and Dac-06-96 09:48 From-Furman & Kallio-Regina +1-306-359-6956 T-392 P.13/31 F-F&K 275-OQ-O1 ending at the chosen location in the second chamber. For example, liquid asphalt, could be introduced at this point, with the hot air stream directed through the third shroud, thus substantially reducing the temperature in the second chamber and reducing damage to the asphalt.
With the exhaust vent operatively connected zo the second shroud, and the exhaust vent operatively connected to the top portion of the second shroud, the invention could further io comprise means to direct the hot air stream in the second chamber downwards towards the bottom of the second chamber as the hot air stream leaves the second chamber and enters the second shroud. The meahs could comprise an annular baffle attached to the exterior surface of the middle drum at a mid-is point of the middle drum, the baffle extending radially into said second chamber and directing the hot air stream towards the inner surface of the outer drum; and a semi-circular baffle attached to the second shroud and extending into the top portion of the second chamber, the baffle angled to direct 2o the hot air stream from the top side of the second chamber towards the bottom thereof.
Thus the hot air stream is forced to the bottom of the second Dec-09-96 09:48 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.14/31 F-E'&K 275-Q4-O1 shroud and must rise to the,top portion to enter the exhaust vent. More of the larger tines will then fall into the mix.
This effect can be accentuated if the airflow path through the second shroud and the exhaust vent has a cross-sectional area greater than the cross-sectional area of the second chamber, whereby the velocity of the hot air stream is reduced as the hot air stream exits the second chamber into the second shroud. Reducing the velocity of the hot air stream will allow more of the fines to settle out re-enter the mix.
~o A liquid material, such as liquid asphalt, could be introduced into the outer drum at a point inside the second chamber.
Moving the injection point down the second chamber somewhat would reduce the temperature that the asphalt is exposed to, i5 and reduce burning.
Further, the asphalt could be introduced through a plurality of nozzles oriented to direct a spray of liquid material across a majority of the cross-section of the second chamber.
The majority of the fines would pass through the spray and be 2o coated with asphalt, thereby becoming heavier and more likely to fall down into the mix.
The hot air stream thus passes through the second chamber Dec-09-96 09:46 From-Furman ~ Kallio-Regina +1-306-359-6956 T-39t P.15/31 F-F&K 275-04-O1 before exiting the drum assembly through the exhaust vent.
The second mixed material would be subjected to higher temperatures, and more drying. The annular baffle at the mid-point of the middle drum directs the hot air stream towards s the outer drum where it can be deflected by the semi-circular baffle would direct it down and into the mix.
DESCRIPTION OF THE DRAWINGS
While the invention is claimed in the concluding portions hereof, preferred embodiments are provided in the accompanying detailed description which may be best understood in conjunction with the accompanying diagrams where like parts in >-s each of the several diagrams are labeled with like numbers, and where:
Figure 1 is a cut-away side view of an embodiment for mixing asphalt and aggregate, with the exhaust vent ao located so that the hot air stream does not pass through the chamber between the middle and outer drums;
Dec-08-98 09:49 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.16/31 F-F&K 275-04-O1 Figure 2 is a cut-away side view of an embodiment for mixing asphalt and aggregate, with the exhaust vent located so that the hot air stream passes through the chamber between the middle and outer drums;
Figure 3 is an end view of the semi-circular baffle.
Figure 4 is an end view of the nozzle ring.
to DETAILED DLSCRIPTION OF THE ILLUSTRATED EL~ODIMENTS
Figure 1 shows one preferred embodiment of the invention. A
drying and mixing plant for particulate material comprises an is inner drum 1, a middle drum 2 and an outer drum 3, each having an input end la, 2a, 3a for receiving particulate material and an output end 1b, 2b, 3b for discharging particulate material.
The drums 1, 2 ands 3 are attached concentrically by drum brackets 4 to form a substantially horizontal drum assembly 5 ao having a top side Sa and a bottom side Sb. The drum assembly 5 is supported on the frame 6 at drive wheel 7 and support wheels 8. Drive wheel 7 is rotationally driven by motor 9, and Dac-08-98 09:49 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.11/31 F-F&K 275-09-O1 the drum assembly 5 is thereby rotated.
The drum assembly 5 forms a first annular chamber 10 between the inner and middle drums 1, 2 and a second annular chamber s 11 between the middle and outer drums 2, 3. The drums 1, 2 and 3 are located such that a first particulate material 20 (indicated by the circular "o" particles in the figures), introduced into the input end la of the inner drum 1 on first conveyor 17, and then dischargEd from the output end lb of the io inner drum 1 is received at a mid-point of the middle drum 2 and is then carried to the output end 2b of the middle drum 2 and received by the input end 3a of the outer drum 3 and carried through the second annular chamber 11 to the output end 3b of the outer drum 3 and discharged from the drum is assembly 5 through a material outlet 12. The direction of flow of the particulate material is dictated by the pitch on the impellers 13 located on the inner surface of the drums 1,
2 and 3. The impellers 13 also lift the particulate material and drop same through the hot air stream 15. Such impellers zo are well known in the prior art and many are suitable for use in the drums 1, 2 and,3..
A hot air source 14 comprises a conventional burner and blower Dec-09-96 09:49 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.18/31 F-64t F&K 275-04-O1 and directs a hot air stream 15 into the input end la of the inner drum 1. The direction of flow of the hot air stream 15 is indicated by the arrows in the figures. A first shroud 16 encloses the first annular chamber 10 at the input end 2a of the middle drum 2. The first shroud 16 provides access for a second particulate material 21 (indicated by the cross figures "x" in the figures) to enter the input end Za of the middle drum 2 via second conveyor 18. A second shroud 19 encloses the second annular chamber 11 at the output end 3b of ~o the outer drum 3 and provides access in the bottom thereof for particulate material to be discharged through the material outlet 23. This is a vibrating, air-blocking type outlet which prevents air from escaping. A finished product conveyor 24 takes the mixed particulate material to storage, is transport or the like as required.
A third shroud 25 encloses the input end 3a of the outer drum
A hot air source 14 comprises a conventional burner and blower Dec-09-96 09:49 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.18/31 F-64t F&K 275-04-O1 and directs a hot air stream 15 into the input end la of the inner drum 1. The direction of flow of the hot air stream 15 is indicated by the arrows in the figures. A first shroud 16 encloses the first annular chamber 10 at the input end 2a of the middle drum 2. The first shroud 16 provides access for a second particulate material 21 (indicated by the cross figures "x" in the figures) to enter the input end Za of the middle drum 2 via second conveyor 18. A second shroud 19 encloses the second annular chamber 11 at the output end 3b of ~o the outer drum 3 and provides access in the bottom thereof for particulate material to be discharged through the material outlet 23. This is a vibrating, air-blocking type outlet which prevents air from escaping. A finished product conveyor 24 takes the mixed particulate material to storage, is transport or the like as required.
A third shroud 25 encloses the input end 3a of the outer drum
3 and provides access for a third particulate material to enter the outer drum 1 through access hatch 26. zn the Zo embodiment illustrated in Figure 1, this hatch 26 is sealed with hatch cover 27, while Figure 2 shows an embodiment with a third material 22 (indicated by the square figures "o" in the figures) being introduced through the hatch 26.
Dec-08-98 09:49 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.19/31 F-F&K 275-09-O1 An exhaust vent 28 is operatively connected to the third shroud 25 for directing the hot air stream 15 out of the drum assembly 5. With the exhaust vent 28 so located, the hot air stream 15 simply travels essentially straight through the drum s assembly 5 from the hot air source 14 to the exhaust vent 28.
It can be seen that material inside the first and second chambers 10, 11 is not exposed to the hot air stream 15, and thus receives less drying than the material that is in the inner drum 1 and the latter half of the middle drum 2. The io embodiment also includes a liquid injection nozzle 29 which protrudes somewhat into the second chamber 12, supported on a pipe 30. Fox liquid asphalt injection, this location would be preferred because it is not in the hot air stream 15, and so is not subject to damage from burning. Liquid asphalt is is supplied to the nozzle 2.9 by conventional pressuri2ed source 40.
In operation particulate material 20 and 21, travels in the same direction through the inner and middle drums 1 and 2, ao opposite to the direction of travel of particulate material 20, 21 through the outer drum 3 and the second annular chamber 12. All particulate material introduced into the drums thereby becomes mixed.
Dec-06-96 09:50 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.20/31 F-Alternatively the exhaust vent 28 may be connected to the top portion of said second shroud 19 as illustrated in Figure 2, wherein the hot air stream 15 passes through the second chamber 11 before exiting the drum assembly 5. The embodiment further comprises means to direct the hot air stream 15 in the second chamber 11 downwards towards the bottom of the second chamber 11 as it leaves the second chamber 11 and enters the second shroud 19. The means utilized comprises an annular baffle 31 attached to the yo exterior surface of the middle drum 2 at a mid-point thereof extending radially into the second chamber 11 and directing the hot air stream 15 towards the inner surface of the outer drum 3. A semi-circular baffle 32, as illustrated in Figure 3, is attached to the second shroud 19 and extends into the is top portion of the second chamber 11. The semi-circular baffle 32 is angled to direct the hot air stream 15 from the top side of the second chamber 11 towards the bottom thereof.
The semi-circular baffle 32 catches the air stream that is accelerated along the inner surface of the outer drum 3 by the zo annular baffle 31 and directs it towards the bottom of the second chamber as the hot air stream 15 enters the second shroud 19.
Dec-08-96 09:50 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.21/31 F-The hot air stream 15 is forced to the bottom~of the second shroud 19 and must therefore rise a greater distance to the top portion of the second shroud 19 to enter the exhaust gent 28. More of the larger fines will then fall into the mix.
This effect is accentuated by the fact that the airflow path through the second shroud 19 and the exhaust vent 28 has a cross-sectional area greater than the cross-sectional area of the second chamber 11. The velocity of the hot air stream 15 is thus reduced as it exits the second chamber 11 into the io second shroud 19. Reducing the velocity of the hot air stream will allow more of the fines to settle out re-enter the mix, thereby reducing waste of material and expulsion of material into the air.
is Also illustrated in Figure 2 is a third particulate material 22 being introduced into the input end 3a of the outer drum 3 through access hatch 26. The third material 22 is mixed with the first and second materials 20, 21 as the material passes through the second chamber 11.
Liquid material 33, such as 2tsphalt, is also introduced to the particulate material just inside the second chamber 11 through a plurality of nozzles 34 mounted on nozzle ring 35 attached Dec-06-98 09:50 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.22/31 F-F&Ff 275-04-01 to frame 6 and oriented to direct a spray of liquid material 33 across a majority of the cross-section of the second chamber 11, as illustrated in Figure 4. The majority of the fines pass through the spray and are coated ~rith the liquid s material 33, thereby becoming heavier and more likely to fall down into the mix.
The invention thus provides greatly increased flexibility in the heating and drying of various particulate materials. The addition of liquid materials is facilitated, and provision is made for utilizing the liquid material to reduce the expulsion of material into the exhaust air stream.
The foregoing is considered as illustrative only of the is ~ principles of the invention. Further, since numerous changes and modifications will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operatidn shown and described, and accordingly, all such suitable changes or modifications in 2o structure or operation which may be resorted to are intended to fall within the scope of the claimed invention.
Dec-08-98 09:49 From-Furman a Kallio-Regina +1-306-359-6956 T-392 P.19/31 F-F&K 275-09-O1 An exhaust vent 28 is operatively connected to the third shroud 25 for directing the hot air stream 15 out of the drum assembly 5. With the exhaust vent 28 so located, the hot air stream 15 simply travels essentially straight through the drum s assembly 5 from the hot air source 14 to the exhaust vent 28.
It can be seen that material inside the first and second chambers 10, 11 is not exposed to the hot air stream 15, and thus receives less drying than the material that is in the inner drum 1 and the latter half of the middle drum 2. The io embodiment also includes a liquid injection nozzle 29 which protrudes somewhat into the second chamber 12, supported on a pipe 30. Fox liquid asphalt injection, this location would be preferred because it is not in the hot air stream 15, and so is not subject to damage from burning. Liquid asphalt is is supplied to the nozzle 2.9 by conventional pressuri2ed source 40.
In operation particulate material 20 and 21, travels in the same direction through the inner and middle drums 1 and 2, ao opposite to the direction of travel of particulate material 20, 21 through the outer drum 3 and the second annular chamber 12. All particulate material introduced into the drums thereby becomes mixed.
Dec-06-96 09:50 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.20/31 F-Alternatively the exhaust vent 28 may be connected to the top portion of said second shroud 19 as illustrated in Figure 2, wherein the hot air stream 15 passes through the second chamber 11 before exiting the drum assembly 5. The embodiment further comprises means to direct the hot air stream 15 in the second chamber 11 downwards towards the bottom of the second chamber 11 as it leaves the second chamber 11 and enters the second shroud 19. The means utilized comprises an annular baffle 31 attached to the yo exterior surface of the middle drum 2 at a mid-point thereof extending radially into the second chamber 11 and directing the hot air stream 15 towards the inner surface of the outer drum 3. A semi-circular baffle 32, as illustrated in Figure 3, is attached to the second shroud 19 and extends into the is top portion of the second chamber 11. The semi-circular baffle 32 is angled to direct the hot air stream 15 from the top side of the second chamber 11 towards the bottom thereof.
The semi-circular baffle 32 catches the air stream that is accelerated along the inner surface of the outer drum 3 by the zo annular baffle 31 and directs it towards the bottom of the second chamber as the hot air stream 15 enters the second shroud 19.
Dec-08-96 09:50 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.21/31 F-The hot air stream 15 is forced to the bottom~of the second shroud 19 and must therefore rise a greater distance to the top portion of the second shroud 19 to enter the exhaust gent 28. More of the larger fines will then fall into the mix.
This effect is accentuated by the fact that the airflow path through the second shroud 19 and the exhaust vent 28 has a cross-sectional area greater than the cross-sectional area of the second chamber 11. The velocity of the hot air stream 15 is thus reduced as it exits the second chamber 11 into the io second shroud 19. Reducing the velocity of the hot air stream will allow more of the fines to settle out re-enter the mix, thereby reducing waste of material and expulsion of material into the air.
is Also illustrated in Figure 2 is a third particulate material 22 being introduced into the input end 3a of the outer drum 3 through access hatch 26. The third material 22 is mixed with the first and second materials 20, 21 as the material passes through the second chamber 11.
Liquid material 33, such as 2tsphalt, is also introduced to the particulate material just inside the second chamber 11 through a plurality of nozzles 34 mounted on nozzle ring 35 attached Dec-06-98 09:50 From-Furman ~ Kallio-Regina +1-306-359-6956 T-392 P.22/31 F-F&Ff 275-04-01 to frame 6 and oriented to direct a spray of liquid material 33 across a majority of the cross-section of the second chamber 11, as illustrated in Figure 4. The majority of the fines pass through the spray and are coated ~rith the liquid s material 33, thereby becoming heavier and more likely to fall down into the mix.
The invention thus provides greatly increased flexibility in the heating and drying of various particulate materials. The addition of liquid materials is facilitated, and provision is made for utilizing the liquid material to reduce the expulsion of material into the exhaust air stream.
The foregoing is considered as illustrative only of the is ~ principles of the invention. Further, since numerous changes and modifications will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operatidn shown and described, and accordingly, all such suitable changes or modifications in 2o structure or operation which may be resorted to are intended to fall within the scope of the claimed invention.
Claims (9)
1. A drying and mixing plant for particulate material comprising:
an inner drum, a middle drum and an outer drum, each having an input end for receiving particulate material and an output end for discharging particulate material, said drums attached concentrically to foam a substantially horizontal drum assembly having a top side and a bottom side, wherein said drums rotate together, said assembly thereby forming a first annular chamber between said inner and middle drums and a second annular chamber between said middle and outer drums;
said drums located such that a first particulate material discharged from said output end of the inner drum is received at a mid-point of said middle drum and is then carried to said output end of the middle drum and received by said input end of the outer drum and carried through said second annular chamber to said output end of the outer drum and discharged from said drum assembly through a material outlet;
a drive operatively connected to said drum assembly and operative to rotate said drum assembly;
a hot air source directing a hot air stream into said input end of the inner drum;
a first shroud enclosing said first annular chamber at said input end of the middle drum, said first shroud providing access for a second particulate material to enter said input end of the middle drum;
a second shroud enclosing said second annular chamber at said output end of the outer drum, said second shroud providing access in the bottom thereof for particulate material to be discharged through said material outlet;
a third shroud enclosing said input end of the outer drum said third shroud providing access for a third particulate material to enter said outer drum;
an exhaust vent operatively connected to one of said second or third shrouds for directing said hot air stream out of said drum assembly; and impellers mounted on the inner surface of each drum for moving particulate material along said drums and for lifting particulate material and dropping same to fall through said hot air stream;
where in operation, particulate material travels in the same direction through said inner and middle drums, opposite to the direction of travel of particulate material through said outer drum and said second annular chamber, all particulate material introduced into said drums thereby becoming mixed.
an inner drum, a middle drum and an outer drum, each having an input end for receiving particulate material and an output end for discharging particulate material, said drums attached concentrically to foam a substantially horizontal drum assembly having a top side and a bottom side, wherein said drums rotate together, said assembly thereby forming a first annular chamber between said inner and middle drums and a second annular chamber between said middle and outer drums;
said drums located such that a first particulate material discharged from said output end of the inner drum is received at a mid-point of said middle drum and is then carried to said output end of the middle drum and received by said input end of the outer drum and carried through said second annular chamber to said output end of the outer drum and discharged from said drum assembly through a material outlet;
a drive operatively connected to said drum assembly and operative to rotate said drum assembly;
a hot air source directing a hot air stream into said input end of the inner drum;
a first shroud enclosing said first annular chamber at said input end of the middle drum, said first shroud providing access for a second particulate material to enter said input end of the middle drum;
a second shroud enclosing said second annular chamber at said output end of the outer drum, said second shroud providing access in the bottom thereof for particulate material to be discharged through said material outlet;
a third shroud enclosing said input end of the outer drum said third shroud providing access for a third particulate material to enter said outer drum;
an exhaust vent operatively connected to one of said second or third shrouds for directing said hot air stream out of said drum assembly; and impellers mounted on the inner surface of each drum for moving particulate material along said drums and for lifting particulate material and dropping same to fall through said hot air stream;
where in operation, particulate material travels in the same direction through said inner and middle drums, opposite to the direction of travel of particulate material through said outer drum and said second annular chamber, all particulate material introduced into said drums thereby becoming mixed.
2. The invention of Claim 1 wherein said exhaust went is operatively connected to said third shroud and wherein a liquid material is introduced into said outer drum at a point inside said second chamber.
3. The invention of Claim 2 wherein said liquid material is liquid asphalt.
9. The invention of Claim 1 wherein said exhaust vent is operatively connected to the top portion of said second shroud and wherein said invention further comprises means to direct said hot air stream in said second chamber downwards towards the bottom of said second chamber as said hot air stream leaves said second chamber and enters said second shroud.
5. The invention of Claim 4 wherein said means to direct said hot air stream comprises:
an annular baffle attached to the exterior surface of said middle drum at a mid-point of said middle drum, said baffle extending radially into said second chamber and directing said hot air stream towards the inner surface of said outer drum; and a semi-circular baffle attached to said second shroud and extending into the top portion of said second chamber, said baffle angled to direct said hot air stream from the top side of said second chamber towards the bottom thereof.
an annular baffle attached to the exterior surface of said middle drum at a mid-point of said middle drum, said baffle extending radially into said second chamber and directing said hot air stream towards the inner surface of said outer drum; and a semi-circular baffle attached to said second shroud and extending into the top portion of said second chamber, said baffle angled to direct said hot air stream from the top side of said second chamber towards the bottom thereof.
6. The invention of Claim 5 wherein the airflow path through said second shroud and said exhaust vent has a cross-sectional area greater than the cross-sectional area of said second chamber, whereby the velocity of said hot air stream is reduced as said hot air stream exits said second chamber into said second shroud.
7. The invention of Claim 6 wherein a liquid material is introduced into said outer drum at a point inside said second chamber.
8. The invention of Claim 7 wherein said liquid material is introduced through a plurality of nozzles oriented to direct a spray of liquid material across a majority of the cross-section of said second chamber.
9. The invention of Claim 8 wherein said liquid material is liquid asphalt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002255304A CA2255304A1 (en) | 1998-12-08 | 1998-12-08 | Multiple drum mixing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002255304A CA2255304A1 (en) | 1998-12-08 | 1998-12-08 | Multiple drum mixing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2255304A1 true CA2255304A1 (en) | 2000-06-08 |
Family
ID=29425768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002255304A Abandoned CA2255304A1 (en) | 1998-12-08 | 1998-12-08 | Multiple drum mixing system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2255304A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107160529A (en) * | 2017-07-14 | 2017-09-15 | 湖北凯利板业有限公司 | A kind of straw powder material glue mixing pavement system |
| CN112717793A (en) * | 2020-11-30 | 2021-04-30 | 河北四通新型金属材料股份有限公司 | Automatic heavy compounding equipment of accuse |
-
1998
- 1998-12-08 CA CA002255304A patent/CA2255304A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107160529A (en) * | 2017-07-14 | 2017-09-15 | 湖北凯利板业有限公司 | A kind of straw powder material glue mixing pavement system |
| CN112717793A (en) * | 2020-11-30 | 2021-04-30 | 河北四通新型金属材料股份有限公司 | Automatic heavy compounding equipment of accuse |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |