CA2124099A1 - Volumetric airlock feeder - Google Patents
Volumetric airlock feederInfo
- Publication number
- CA2124099A1 CA2124099A1 CA 2124099 CA2124099A CA2124099A1 CA 2124099 A1 CA2124099 A1 CA 2124099A1 CA 2124099 CA2124099 CA 2124099 CA 2124099 A CA2124099 A CA 2124099A CA 2124099 A1 CA2124099 A1 CA 2124099A1
- Authority
- CA
- Canada
- Prior art keywords
- vanes
- housing
- drum assembly
- cavities
- end plates
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/10—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation
- G01F11/12—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements
- G01F11/20—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates
- G01F11/24—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates for fluent solid material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
- B65G53/4608—Turnable elements, e.g. rotary wheels with pockets or passages for material
- B65G53/4625—Turnable elements, e.g. rotary wheels with pockets or passages for material with axis of turning perpendicular to flow
- B65G53/4633—Turnable elements, e.g. rotary wheels with pockets or passages for material with axis of turning perpendicular to flow the element having pockets, rotated from charging position to discharging position, i.e. discrete flow
- B65G53/4641—Turnable elements, e.g. rotary wheels with pockets or passages for material with axis of turning perpendicular to flow the element having pockets, rotated from charging position to discharging position, i.e. discrete flow with means for clearing out the pockets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
- B65G65/48—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems
- B65G65/4881—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems rotating about a substantially horizontal axis
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Formation And Processing Of Food Products (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
A volumetric airlock feeding apparatus includes a rotatable drum assembly constructed from a plurality of straight vanes and curved web segments to define pockets for receiving material to be discharged.
Material discharge is facilitated by a cleaning assembly having a plurality of bars which scoop the material to be discharged from their respective pockets during operation of the apparatus. The apparatus can be constructed to have increased material handling capacity for a given size by virtue of the design of the drum assembly.
Material discharge is facilitated by a cleaning assembly having a plurality of bars which scoop the material to be discharged from their respective pockets during operation of the apparatus. The apparatus can be constructed to have increased material handling capacity for a given size by virtue of the design of the drum assembly.
Description
212~D~9 -VOLUMETRIC AIRLOCK FEEDER
The present invention relates in general to a volumetric airlock feeder, and more particularly, to a self discharging feeder having increased capacity for handling a variety of material types, for example, readily flowable materials such as powders and beads, as well as difficult to handle materials such as putties and pastes.
Volumetric rotary feeders are designed for feeding a variety of free flowing and paste-like materials between different working environments.
Hence, the feeder provides a rotary seal between the different environments to function as an airlock while freely feeding materials therebetween. Conventional volumetric airlock feeders include a rotatable drum within a housing having a material inlet opening and a material discharge opening. The rotatable drum includes a plurality of elongated circumscribing V-shaped pockets formed between radially extending vanes to feed the material between the inlet and discharge openings. To reduce capacity, certain feeders have constructed shallow pockets by installation of a web between adjacent vanes. Volumetric airlock feeders of the aforementioned type are known from Detroit Stoker Company, a subsidiary of United Industrial Corporation of Monroe, Michigan, Bush & Wilton Valves, Inc. of Ocean Springs, Mississippi and Smoot Company of Kansas City, Kansas. There is also known from Wyssmont Company, Inc.
of Fort Lee, New Jersey the construction of a cusped cylindrical drum formed from castable metals having shallow pockets.
One difficulty with volumetric airlock feeders is the ability to discharge putty and paste-like materials from the pockets. To this end, feeders from the Detroit Stoker Company employ chains within each of the pockets in an effort to alleviate packing due to sticky materials. The feeder designed by Wyssmont Company, Inc. employs a rotatable cleaning blade whose 212~099 _ -2-this regard, during each revolution of the drum, the pockets are emptied by the scooping action of the cleaning blade as the pockets pass over the discharge opening.
Despite these known designs for volumetric airlock feeders, the feeding of difficult to handle materials such as putties and pastes remains present.
For example, pastes and putties are difficult to feed into the pockets of the known volumetric airlock feeders. In addition, it is desired to design these feeders with increased capacity without having to increase the drum diameter or length. As these feeder function as airlocks, the seal is created between the tip of the drum vanes and the interior surface of the housing. As the drum length increases, the surface area which is subject to leakage also increases. It is therefore desirable to reduce the surface area as small as possible to minimize losses across the seal area. To date, minimizing seal area and maximizing feeder capacity have been incompatible objectives that have yet to be achieved in a single volumetric airlock feeder.
In accordance with one embodiment of the present invention there is provided a rotary feeding apparatus comprising a housing having an inlet and an outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within the housing between the inlet and the outlet, the drum assembly including a plurality of elongated cavities circumferentially arranged, each of the cavities formed from a pair of spaced apart radially extending linear vanes and an intermediate curved web segment, a discharge assembly rotatably mounted adjacent the outlet of the housing for discharging material from the cavities, the discharge assembly including an elongated blade having an edge following a circular path within the cavities adjacent the vanes and the web segment for discharging material therefrom, and rotating means for rotating the drum assembly and the discharge assembly.
_~ -3 In accordance with another embodiment of the present invention there is provided a rotary feeding apparatus comprising a housing having an inlet and an outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within the housing between the inlet and the outlet, the drum assembly including a plurality of elongated cavities circumferentially arranged, each of the cavities formed from a pair of spaced apart radially extending vanes and an intermediate curved web segment having a center of its radius of curvature adjacent the circumference of the vanes, whereby an imaginary circle formed by the web segment has a portion of its circumference within the cavities adjacent the vanes, a discharge assembly rotatably mounted adjacent the outlet of the housing for discharging material within the cavities, the discharge assembly including an elongated blade having an edge following a circular path within the cavities adjacent the vanes and the web segments for discharging material therefrom, and means for rotating the drum assembly and the discharge assembly.
In accordance with another embodiment of the present invention there is provided a rotary feeding apparatus comprising a housing having an inlet and outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within the housing between the inlet and the outlet, the drum assembly including a plurality of elongated cavities circumferentially arranged, a pair of spaced apart end plates having inner and outer surfaces, the inner surfaces having a plurality of radially arranged grooves and a plurality of recessed areas therebetween, each of the cavities formed from a pair of spaced apart radially extending vanes received within the grooves and an intermediate curved web segment received within the recessed areas, a discharge assembly rotatably mounted adjacent the outlet of the housing for discharging material within the cavities, the discharge assembly 2124G~9 _ -4-including an elongated blade having an edge following a circular path within the cavities adjacent the vanes and the web segment for discharging material therefrom, and means for rotating the drum assembly and the discharge assembly.
In accordance with another embodiment of the present invention there is provided a rotary feeding apparatus comprising a housing having an inlet and outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within the housing between the inlet and the outlet, the housing having an opening sized to receive the drum assembly therethrough, the drum assembly including a plurality of elongated cavities circumferentially arranged about the drum assembly, a pair of spaced apart end plates having inner and outer surfaces, the inner surfaces having a plurality of radially arranged grooves and a plurality of recessed areas therebetween, each of the cavities formed from a pair of spaced apart radially extending linear vanes received within the grooves and an intermediate curved web segment received within the recessed areas, the curved web segment having a center of its radius of curvature adjacent the circumference of the vanes whereby an imaginary circle formed by the web segment has a portion of its circumference within the cavities adjacent the vanes, a discharge assembly rotatably mounted adjacent the outlet of the housing for discharging material within the cavities, the discharge assembly including a pair of elongated blades each having an edge following a circular path within the cavities adjacent the vanes and the web segment for discharging material therefrom, and means for simultaneously rotating the drum assembly and the discharge assembly.
The present invention will be more fully understood with reference to the detailed description when taken in conjunction with the following drawings.
Fig. 1 is a side elevational view of a volumetric airlock feeding apparatus constructed in accordance with the present invention.
Fig. 2 is a top plan view of the volumetric airlock feeding apparatus.
Fig. 3 is a cross-sectional view of a portion of the housing of the volumetric airlock feeding apparatus.
Fig. 4 is a front elevational view of the housing of the volumetric airlock feeding apparatus.
Fig. 5 is a front elevational view of a rotatable drum assembly contained within the housing of the volumetric airlock feeding apparatus.
Fig. 6 is a partial cross-sectional view of the drum assembly taken along lines 6-6 in Fig. 5.
Fig. 7 is a front elevational view of an end plate formed as a component of the drum assembly having a plurality of radially arranged grooves and intermediate recessed areas.
Fig. 8 is a cross-sectional view of a curved web segment formed as a component for the drum assembly having a uniform radius of curvature.
Fig. 9 is a side elevational view of the housing of the volumetric airlock feeding apparatus in partially assembled state.
Fig. 10 is a side elevational view of the housing of the volumetric airlock feeding apparatus in partially assembled state.
Fig. 11 is a partial cross-sectional view showing an exterior seal assembly for sealing the drum assembly to the exterior of the housing of the volumetric airlock feeding apparatus.
Fig. 12 is a front elevational view of the cleaning bar assembly.
Fig. 13 is a cross-sectional view of the cleaning bar assembly taken along lines 13-13 in Fig.
12.
The present invention relates in general to a volumetric airlock feeder, and more particularly, to a self discharging feeder having increased capacity for handling a variety of material types, for example, readily flowable materials such as powders and beads, as well as difficult to handle materials such as putties and pastes.
Volumetric rotary feeders are designed for feeding a variety of free flowing and paste-like materials between different working environments.
Hence, the feeder provides a rotary seal between the different environments to function as an airlock while freely feeding materials therebetween. Conventional volumetric airlock feeders include a rotatable drum within a housing having a material inlet opening and a material discharge opening. The rotatable drum includes a plurality of elongated circumscribing V-shaped pockets formed between radially extending vanes to feed the material between the inlet and discharge openings. To reduce capacity, certain feeders have constructed shallow pockets by installation of a web between adjacent vanes. Volumetric airlock feeders of the aforementioned type are known from Detroit Stoker Company, a subsidiary of United Industrial Corporation of Monroe, Michigan, Bush & Wilton Valves, Inc. of Ocean Springs, Mississippi and Smoot Company of Kansas City, Kansas. There is also known from Wyssmont Company, Inc.
of Fort Lee, New Jersey the construction of a cusped cylindrical drum formed from castable metals having shallow pockets.
One difficulty with volumetric airlock feeders is the ability to discharge putty and paste-like materials from the pockets. To this end, feeders from the Detroit Stoker Company employ chains within each of the pockets in an effort to alleviate packing due to sticky materials. The feeder designed by Wyssmont Company, Inc. employs a rotatable cleaning blade whose 212~099 _ -2-this regard, during each revolution of the drum, the pockets are emptied by the scooping action of the cleaning blade as the pockets pass over the discharge opening.
Despite these known designs for volumetric airlock feeders, the feeding of difficult to handle materials such as putties and pastes remains present.
For example, pastes and putties are difficult to feed into the pockets of the known volumetric airlock feeders. In addition, it is desired to design these feeders with increased capacity without having to increase the drum diameter or length. As these feeder function as airlocks, the seal is created between the tip of the drum vanes and the interior surface of the housing. As the drum length increases, the surface area which is subject to leakage also increases. It is therefore desirable to reduce the surface area as small as possible to minimize losses across the seal area. To date, minimizing seal area and maximizing feeder capacity have been incompatible objectives that have yet to be achieved in a single volumetric airlock feeder.
In accordance with one embodiment of the present invention there is provided a rotary feeding apparatus comprising a housing having an inlet and an outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within the housing between the inlet and the outlet, the drum assembly including a plurality of elongated cavities circumferentially arranged, each of the cavities formed from a pair of spaced apart radially extending linear vanes and an intermediate curved web segment, a discharge assembly rotatably mounted adjacent the outlet of the housing for discharging material from the cavities, the discharge assembly including an elongated blade having an edge following a circular path within the cavities adjacent the vanes and the web segment for discharging material therefrom, and rotating means for rotating the drum assembly and the discharge assembly.
_~ -3 In accordance with another embodiment of the present invention there is provided a rotary feeding apparatus comprising a housing having an inlet and an outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within the housing between the inlet and the outlet, the drum assembly including a plurality of elongated cavities circumferentially arranged, each of the cavities formed from a pair of spaced apart radially extending vanes and an intermediate curved web segment having a center of its radius of curvature adjacent the circumference of the vanes, whereby an imaginary circle formed by the web segment has a portion of its circumference within the cavities adjacent the vanes, a discharge assembly rotatably mounted adjacent the outlet of the housing for discharging material within the cavities, the discharge assembly including an elongated blade having an edge following a circular path within the cavities adjacent the vanes and the web segments for discharging material therefrom, and means for rotating the drum assembly and the discharge assembly.
In accordance with another embodiment of the present invention there is provided a rotary feeding apparatus comprising a housing having an inlet and outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within the housing between the inlet and the outlet, the drum assembly including a plurality of elongated cavities circumferentially arranged, a pair of spaced apart end plates having inner and outer surfaces, the inner surfaces having a plurality of radially arranged grooves and a plurality of recessed areas therebetween, each of the cavities formed from a pair of spaced apart radially extending vanes received within the grooves and an intermediate curved web segment received within the recessed areas, a discharge assembly rotatably mounted adjacent the outlet of the housing for discharging material within the cavities, the discharge assembly 2124G~9 _ -4-including an elongated blade having an edge following a circular path within the cavities adjacent the vanes and the web segment for discharging material therefrom, and means for rotating the drum assembly and the discharge assembly.
In accordance with another embodiment of the present invention there is provided a rotary feeding apparatus comprising a housing having an inlet and outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within the housing between the inlet and the outlet, the housing having an opening sized to receive the drum assembly therethrough, the drum assembly including a plurality of elongated cavities circumferentially arranged about the drum assembly, a pair of spaced apart end plates having inner and outer surfaces, the inner surfaces having a plurality of radially arranged grooves and a plurality of recessed areas therebetween, each of the cavities formed from a pair of spaced apart radially extending linear vanes received within the grooves and an intermediate curved web segment received within the recessed areas, the curved web segment having a center of its radius of curvature adjacent the circumference of the vanes whereby an imaginary circle formed by the web segment has a portion of its circumference within the cavities adjacent the vanes, a discharge assembly rotatably mounted adjacent the outlet of the housing for discharging material within the cavities, the discharge assembly including a pair of elongated blades each having an edge following a circular path within the cavities adjacent the vanes and the web segment for discharging material therefrom, and means for simultaneously rotating the drum assembly and the discharge assembly.
The present invention will be more fully understood with reference to the detailed description when taken in conjunction with the following drawings.
Fig. 1 is a side elevational view of a volumetric airlock feeding apparatus constructed in accordance with the present invention.
Fig. 2 is a top plan view of the volumetric airlock feeding apparatus.
Fig. 3 is a cross-sectional view of a portion of the housing of the volumetric airlock feeding apparatus.
Fig. 4 is a front elevational view of the housing of the volumetric airlock feeding apparatus.
Fig. 5 is a front elevational view of a rotatable drum assembly contained within the housing of the volumetric airlock feeding apparatus.
Fig. 6 is a partial cross-sectional view of the drum assembly taken along lines 6-6 in Fig. 5.
Fig. 7 is a front elevational view of an end plate formed as a component of the drum assembly having a plurality of radially arranged grooves and intermediate recessed areas.
Fig. 8 is a cross-sectional view of a curved web segment formed as a component for the drum assembly having a uniform radius of curvature.
Fig. 9 is a side elevational view of the housing of the volumetric airlock feeding apparatus in partially assembled state.
Fig. 10 is a side elevational view of the housing of the volumetric airlock feeding apparatus in partially assembled state.
Fig. 11 is a partial cross-sectional view showing an exterior seal assembly for sealing the drum assembly to the exterior of the housing of the volumetric airlock feeding apparatus.
Fig. 12 is a front elevational view of the cleaning bar assembly.
Fig. 13 is a cross-sectional view of the cleaning bar assembly taken along lines 13-13 in Fig.
12.
2~24099 Fig. 14 is a partial cross-sectional view of a seal assembly for sealing the rotatable shaft of the cleaning bar assembly to the exterior of the housing of the volumetric airlock feeding apparatus.
Fig. 15 is diagrammatic illustration showing the operative relationship between the drum assembly and the cleaning bar assembly.
Fig. 16 is a diagrammatic illustration showing the path of travel of the leading edge of the cleaning bar with respect to the cavities circumferentially formed about the drum assembly.
Referring now to the drawings wherein like reference numerals represent like elements, there is shown in Figs. 1 and 2 a volumetric airlock feeding apparatus generally designated as reference numeral 100.
The apparatus 100 is constructed from a base 102 supporting a variable speed motor 104 and a housing 106.
The housing 106 is formed from a pair of spaced apart endwalls 108, 110 and a pair of spaced apart front and rear walls 112, 114. The front and rear walls are more clearly shown in cross section in Fig. 3. The housing 106 is formed with an inlet opening 116 and an underlying discharge opening 118. An access opening 120 is formed within the housing underlying the front wall 112 which is closable by a removable hatch 122 as best shown in Fig. 4. The hatch 122 is provided with a plurality of lugs 124 each having a U-shaped opening for receiving a threaded stud 126 extending outwardly from the housing 106. The hatch 122 can be removably fastened to the housing 106 overlying the access opening. Rotatably mounted within the housing 106 is a drum assembly 128 and a cleaning bar assembly 130.
Referring to Figs. 5-8, the construction of the drum assembly 128 will now be described. The drum assembly 128 includes a longitudinally extending shaft 132 to which there is attached, such as by welding, a pair of spaced apart circular end plates 134, 136. As shown in Fig. 7, each of the end plates 134, 136 is 2124~99 _ -7-provided with a central opening 138 adapted to receive shaft 132. The inwardly facing surfaces of the end plates 134, 136 are formed with a plurality of radially arranged straight grooves 140 and circumferentially arranged recessed areas 142. The recessed areas 142 are formed between adjacent grooves 140 and have a curved lip 144 having a predetermined radius. A ring 146 is attached to the outer surface of each of the end plates 134, 136 to form part of a seal assembly as to be described hereinafter.
A plurality of radially arranged plate-like linear vanes 148 are attached within the grooves 140 between the end plates 134, 136 such as by welding to the end plates. It is to be noted that the vanes 148, however, are not welded or otherwise attached to the shaft 132. A plurality of curved web segments 150 are formed from segments of a tubular pipe 149 of uniform diameter. The web segments 150 have chamfered ends and are supported by the end wall 144 formed by the recessed areas 142 between adjacent vanes 148. The web segments 150 are secured to the vanes 148 such as by welding or the like. The inwardly facing surfaces of the end plates 134, 136 within the recessed areas 142, vanes 148 and web segments 150 form elongated material receiving pockets or cavities 152 arranged circumferentially about the drum assembly 128. As to be described hereinafter, the material handling capacity of the drum assembly 128 will be determined by the volume of the pockets 152.
Referring now to Figs. 9-11, the end walls 108, 110 are provided with an enlarged opening 154 sized to enable the outward projection of the rings 146 (see Fig. 11) when the drum assembly 128 is positioned within the housing 106. The opening 154 is thus of sufficient size to enable the passage of the drum assembly 128 into the interior of the housing 106 through the end walls 108, 110 during assembly. A ring 156 is attached to the outer surface of the end walls 108, 110 concentrically surrounding the ring 146 extending from the drum ~ 12g D99 -_ -8-assembly 128 to form an annular opening 158 therebetween. The annular opening 158 is filled with conventional packing material such as woven Teflon. A
plurality of threaded studs 160 are secured about the periphery of the ring 156. An annular follower 162 having a depending ring 164 extending into the annular opening 158 includes a plurality of circumferentially arranged openings for receiving the studs 160. Upon compressing the packing material within the annular opening 158 by means of the follower 152, a rotary seal is formed between the housing 106 and drum assembly 128, vis-a-vis between the rings 146, 156.
A plurality of uprights 166 are attached to the outer surface of the end walls 108, 110 outwardly of ring 156. The uprights support an attached ring 168 having a straight side 169, to which there is bolted a flat circular plate 170. The plate 170, as shown in Fig. 1, has an opening 172 sized to receive the shaft 132 of the drum assembly 128 and a straight side 172.
The plate 170 supports a bearing 174 through which the shaft 132 of the drum assembly extends for rotatable support.
Referring now to Figs. 12 and 13, the cleaning bar assembly includes an elongated shaft 176 to which there is keyed two pairs of spaced apart cleaning bar supports 178, 180 and 182, 184. The pairs of cleaning bar supports 178, 180 and 182, 184 are bolted together for rotation with the shaft 176 by means of keys 186. A
pair of elongated L-shaped cleaning bars 188 are bolted across the ends of the cleaning bars 178, 182 and 180, 184.
The cleaning bar assembly 130, as shown in Figs. 1 and 2, is mounted extending through the housing 106 overlying the discharge opening 118 adjacent the periphery of the drum assembly 128. Referring to Figs.
9, 10 and 14, the end walls 108, 110 are provided with an opening 190 through which the shaft 176 of the cleaning bar assembly 130 extends. A ring 192 is ~124 099 g attached to end walls 108, 110 surrounding the openings 190 to form an annular opening 194 with the shaft 176 to receive woven Teflon packing material. A pair of spaced apart threaded studs 196 are attached to the end walls 108, 110 outwardly of ring 192 for attaching a follower 198 thereto. The follower 198 includes a depending ring 200 which is received within the annular opening 194 for compressing the packing material thereby creating a rotary seal between the shaft 176 and ring 192. A U-shaped bracket 202 is attached to the end walls 108, 110 overlying the seal region for the shaft 176. The bracket 202 includes a base 204 having an opening 206 through which the shaft 176 extends. A bearing 208 is supported on the base 204 for rotational support of the shaft 176 and hence the cleaning bar assembly 130.
Referring to Fig. 2, the drive assembly for rotating the drum assembly 128 and cleaning bar assembly 130 will now be described. The drive assembly includes a gear 210 attached to the shaft 132 of the drum assembly 128 which is meshed with a pinion gear 212 attached to the shaft 176 of the cleaning bar assembly 130. Shaft 176 further supports a torque limiting clutch 214 which is driven by means of chain 216 coupled to a sprocket 218 driven by the variable speed motor 104. Hence, the motor 104 is adapted to simultaneously rotate the drum assembly 128 and cleaning bar assembly 130 at different speeds depending upon the ratio of the diameter of gear 210 and pinion gear 212. In the preferred embodiment, the ratio is 3/1 such that the cleaning bar assembly 130 rotates three times faster than the drum assembly 128.
The volumetric airlock feeding apparatus 100 of the present invention can be designed to provide a wide range of capacities for use in a particular material handling operation. The design features of the drum assembly 128 lend themselves to providing an apparatus 100 of increased capacity, while at the same time, decreasing or maintaining the overall size of the ~12q~99 drum assembly. This is achieved by changing the shape of the individual pockets 152 which is made possible by the construction of the drum assembly 128 from individual components, i.e., radial vanes 148 and web segments 150.
In particular, by reducing the number of pockets 152 and altering their shape, a substantial increase in capacity of the apparatus 100 can be obtained without changing the overall size of the drum assembly 128. By way of one example, an apparatus 100 in accordance with the present invention having six pockets 152 can provide an increased capacity of 3 1/2 -4 times that of an apparatus of the same drum assembly size constructed from a cast member having twelve scalloped pockets as available from Wyssmont Company, Inc. It has been determined that the optimum number of pockets 152 for the drum assembly 128 for maximum capacity is between six and eight pockets, and preferably six pockets.
The construction of the drum assembly 128 including six pockets 152 requires that each of the vanes 148 be separated by 60. When constructing the front and rear walls 112, 114 of the housing 106, as shown in Fig. 3, the angle ~ must therefore be greater than 60. This will ensure that the tip of at least one vein 148 will be adjacent the inner surface of a respective front wall 112 and rear wall 114 to form a seal therebetween. Similarly, a drum assembly 112 containing eight pockets 152 will require that the angle ~ be greater than 45. For ease of manufacture, it is preferred that the number of pockets 152 be an even number.
Referring to Fig. 6, the capacity of the drum assembly 128 is directly proportional to the cross-sectional area of the pockets 152 as designated by the shaded section 220. As the tips of the cleaning bar 188 of the cleaning bar assembly 130 transcribe a circular path during rotation, it is preferred that the profile of the pockets 152 approximate a semicircle.
Hence, the maximum cross-sectional area of the shaded section 220 will be achieved when the center 221 of the radius of curvature of an imaginary circle 222 having the web segment 150 forming part of its circumference falls within the pocket 152, and preferably adjacent the peripheral edge of the end plates 134, 136. In other words, the center of the radius of curvature of the pockets 152 is positioned adjacent the imaginary circle formed by the tips of the vanes 148. As shown, the imaginary circle 222 is bound by the pocket 152 by the close proximity of the vanes 148 and curved web segments 150. It will be appreciated that the design considerations for the drum assembly 128 of increased capacity using linear vanes 148 and web segments 150 are somewhat different from those employed in a cast drum assembly having shallow pockets as known from the apparatus of Wyssmont, Company, Inc.
Referring to Fig. 15, there is shown the operative relationship between the drum assembly 128 and the cleaning bar assembly 130. In this regard, the shaft 176 of the cleaning bar assembly 130 is positioned such that the tip of the cleaning bar 188 will travel its circular path within the pockets 152 without engagement with the vanes 148 or web segment 150 during rotat.on of the drum assembly 128 for discharging material therefrom.
Referring to Fig. 16, there is shown the travel path of the tip of the cleaning bar 188 of the cleaning bar assembly 130, as designated by the dash lines 224. As shown, the leading edge of the cleaning bar 188 will scoop out each of the pockets 152 of the drum assembly 128 without contact with the vanes 148 or web segments 150 which would otherwise potentially jam the apparatus 100. Accordingly, the travel path 224 of the tips of the cleaning bars 188 is a function of the radius of the gear 210, radius of the pinion gear 212, 2 1 ~ 9 radius of the cleaning bar assembly 130 and radius of the drum assembly 128.
The apparatus 100, constructed to include a drum assembly 128 having straight vanes 148 and curved web segments 150, can employ a rotary cleaning bar assembly 130. Further, the apparatus 100 can be constructed to minimize the size of the drum assembly 128, while maximizing its material handling capacity.
For example, the length of the drum assembly 128 may be shortened by approximately 1/4 - 1/3 the length of the previous known drum assemblies without decrease in capacity. The shortening of the drum assembly length results in a corresponding decrease in seal area between the vanes 148 and housing 106 thereby substantially reducing potential leakage. Still further, the construction of the apparatus results in a more even discharge of material from the pockets 152 by action of the cleaning bar assembly 130 as the material is discharged over both sides of the cleaning bar assembly.
Although the invention herein has been described with references to particular embodiments, it is to be understood that the embodiments are merely illustrative of the principles and application of the present invention. It is therefore to be understood that numerous modifications may be made to the embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the claims.
Fig. 15 is diagrammatic illustration showing the operative relationship between the drum assembly and the cleaning bar assembly.
Fig. 16 is a diagrammatic illustration showing the path of travel of the leading edge of the cleaning bar with respect to the cavities circumferentially formed about the drum assembly.
Referring now to the drawings wherein like reference numerals represent like elements, there is shown in Figs. 1 and 2 a volumetric airlock feeding apparatus generally designated as reference numeral 100.
The apparatus 100 is constructed from a base 102 supporting a variable speed motor 104 and a housing 106.
The housing 106 is formed from a pair of spaced apart endwalls 108, 110 and a pair of spaced apart front and rear walls 112, 114. The front and rear walls are more clearly shown in cross section in Fig. 3. The housing 106 is formed with an inlet opening 116 and an underlying discharge opening 118. An access opening 120 is formed within the housing underlying the front wall 112 which is closable by a removable hatch 122 as best shown in Fig. 4. The hatch 122 is provided with a plurality of lugs 124 each having a U-shaped opening for receiving a threaded stud 126 extending outwardly from the housing 106. The hatch 122 can be removably fastened to the housing 106 overlying the access opening. Rotatably mounted within the housing 106 is a drum assembly 128 and a cleaning bar assembly 130.
Referring to Figs. 5-8, the construction of the drum assembly 128 will now be described. The drum assembly 128 includes a longitudinally extending shaft 132 to which there is attached, such as by welding, a pair of spaced apart circular end plates 134, 136. As shown in Fig. 7, each of the end plates 134, 136 is 2124~99 _ -7-provided with a central opening 138 adapted to receive shaft 132. The inwardly facing surfaces of the end plates 134, 136 are formed with a plurality of radially arranged straight grooves 140 and circumferentially arranged recessed areas 142. The recessed areas 142 are formed between adjacent grooves 140 and have a curved lip 144 having a predetermined radius. A ring 146 is attached to the outer surface of each of the end plates 134, 136 to form part of a seal assembly as to be described hereinafter.
A plurality of radially arranged plate-like linear vanes 148 are attached within the grooves 140 between the end plates 134, 136 such as by welding to the end plates. It is to be noted that the vanes 148, however, are not welded or otherwise attached to the shaft 132. A plurality of curved web segments 150 are formed from segments of a tubular pipe 149 of uniform diameter. The web segments 150 have chamfered ends and are supported by the end wall 144 formed by the recessed areas 142 between adjacent vanes 148. The web segments 150 are secured to the vanes 148 such as by welding or the like. The inwardly facing surfaces of the end plates 134, 136 within the recessed areas 142, vanes 148 and web segments 150 form elongated material receiving pockets or cavities 152 arranged circumferentially about the drum assembly 128. As to be described hereinafter, the material handling capacity of the drum assembly 128 will be determined by the volume of the pockets 152.
Referring now to Figs. 9-11, the end walls 108, 110 are provided with an enlarged opening 154 sized to enable the outward projection of the rings 146 (see Fig. 11) when the drum assembly 128 is positioned within the housing 106. The opening 154 is thus of sufficient size to enable the passage of the drum assembly 128 into the interior of the housing 106 through the end walls 108, 110 during assembly. A ring 156 is attached to the outer surface of the end walls 108, 110 concentrically surrounding the ring 146 extending from the drum ~ 12g D99 -_ -8-assembly 128 to form an annular opening 158 therebetween. The annular opening 158 is filled with conventional packing material such as woven Teflon. A
plurality of threaded studs 160 are secured about the periphery of the ring 156. An annular follower 162 having a depending ring 164 extending into the annular opening 158 includes a plurality of circumferentially arranged openings for receiving the studs 160. Upon compressing the packing material within the annular opening 158 by means of the follower 152, a rotary seal is formed between the housing 106 and drum assembly 128, vis-a-vis between the rings 146, 156.
A plurality of uprights 166 are attached to the outer surface of the end walls 108, 110 outwardly of ring 156. The uprights support an attached ring 168 having a straight side 169, to which there is bolted a flat circular plate 170. The plate 170, as shown in Fig. 1, has an opening 172 sized to receive the shaft 132 of the drum assembly 128 and a straight side 172.
The plate 170 supports a bearing 174 through which the shaft 132 of the drum assembly extends for rotatable support.
Referring now to Figs. 12 and 13, the cleaning bar assembly includes an elongated shaft 176 to which there is keyed two pairs of spaced apart cleaning bar supports 178, 180 and 182, 184. The pairs of cleaning bar supports 178, 180 and 182, 184 are bolted together for rotation with the shaft 176 by means of keys 186. A
pair of elongated L-shaped cleaning bars 188 are bolted across the ends of the cleaning bars 178, 182 and 180, 184.
The cleaning bar assembly 130, as shown in Figs. 1 and 2, is mounted extending through the housing 106 overlying the discharge opening 118 adjacent the periphery of the drum assembly 128. Referring to Figs.
9, 10 and 14, the end walls 108, 110 are provided with an opening 190 through which the shaft 176 of the cleaning bar assembly 130 extends. A ring 192 is ~124 099 g attached to end walls 108, 110 surrounding the openings 190 to form an annular opening 194 with the shaft 176 to receive woven Teflon packing material. A pair of spaced apart threaded studs 196 are attached to the end walls 108, 110 outwardly of ring 192 for attaching a follower 198 thereto. The follower 198 includes a depending ring 200 which is received within the annular opening 194 for compressing the packing material thereby creating a rotary seal between the shaft 176 and ring 192. A U-shaped bracket 202 is attached to the end walls 108, 110 overlying the seal region for the shaft 176. The bracket 202 includes a base 204 having an opening 206 through which the shaft 176 extends. A bearing 208 is supported on the base 204 for rotational support of the shaft 176 and hence the cleaning bar assembly 130.
Referring to Fig. 2, the drive assembly for rotating the drum assembly 128 and cleaning bar assembly 130 will now be described. The drive assembly includes a gear 210 attached to the shaft 132 of the drum assembly 128 which is meshed with a pinion gear 212 attached to the shaft 176 of the cleaning bar assembly 130. Shaft 176 further supports a torque limiting clutch 214 which is driven by means of chain 216 coupled to a sprocket 218 driven by the variable speed motor 104. Hence, the motor 104 is adapted to simultaneously rotate the drum assembly 128 and cleaning bar assembly 130 at different speeds depending upon the ratio of the diameter of gear 210 and pinion gear 212. In the preferred embodiment, the ratio is 3/1 such that the cleaning bar assembly 130 rotates three times faster than the drum assembly 128.
The volumetric airlock feeding apparatus 100 of the present invention can be designed to provide a wide range of capacities for use in a particular material handling operation. The design features of the drum assembly 128 lend themselves to providing an apparatus 100 of increased capacity, while at the same time, decreasing or maintaining the overall size of the ~12q~99 drum assembly. This is achieved by changing the shape of the individual pockets 152 which is made possible by the construction of the drum assembly 128 from individual components, i.e., radial vanes 148 and web segments 150.
In particular, by reducing the number of pockets 152 and altering their shape, a substantial increase in capacity of the apparatus 100 can be obtained without changing the overall size of the drum assembly 128. By way of one example, an apparatus 100 in accordance with the present invention having six pockets 152 can provide an increased capacity of 3 1/2 -4 times that of an apparatus of the same drum assembly size constructed from a cast member having twelve scalloped pockets as available from Wyssmont Company, Inc. It has been determined that the optimum number of pockets 152 for the drum assembly 128 for maximum capacity is between six and eight pockets, and preferably six pockets.
The construction of the drum assembly 128 including six pockets 152 requires that each of the vanes 148 be separated by 60. When constructing the front and rear walls 112, 114 of the housing 106, as shown in Fig. 3, the angle ~ must therefore be greater than 60. This will ensure that the tip of at least one vein 148 will be adjacent the inner surface of a respective front wall 112 and rear wall 114 to form a seal therebetween. Similarly, a drum assembly 112 containing eight pockets 152 will require that the angle ~ be greater than 45. For ease of manufacture, it is preferred that the number of pockets 152 be an even number.
Referring to Fig. 6, the capacity of the drum assembly 128 is directly proportional to the cross-sectional area of the pockets 152 as designated by the shaded section 220. As the tips of the cleaning bar 188 of the cleaning bar assembly 130 transcribe a circular path during rotation, it is preferred that the profile of the pockets 152 approximate a semicircle.
Hence, the maximum cross-sectional area of the shaded section 220 will be achieved when the center 221 of the radius of curvature of an imaginary circle 222 having the web segment 150 forming part of its circumference falls within the pocket 152, and preferably adjacent the peripheral edge of the end plates 134, 136. In other words, the center of the radius of curvature of the pockets 152 is positioned adjacent the imaginary circle formed by the tips of the vanes 148. As shown, the imaginary circle 222 is bound by the pocket 152 by the close proximity of the vanes 148 and curved web segments 150. It will be appreciated that the design considerations for the drum assembly 128 of increased capacity using linear vanes 148 and web segments 150 are somewhat different from those employed in a cast drum assembly having shallow pockets as known from the apparatus of Wyssmont, Company, Inc.
Referring to Fig. 15, there is shown the operative relationship between the drum assembly 128 and the cleaning bar assembly 130. In this regard, the shaft 176 of the cleaning bar assembly 130 is positioned such that the tip of the cleaning bar 188 will travel its circular path within the pockets 152 without engagement with the vanes 148 or web segment 150 during rotat.on of the drum assembly 128 for discharging material therefrom.
Referring to Fig. 16, there is shown the travel path of the tip of the cleaning bar 188 of the cleaning bar assembly 130, as designated by the dash lines 224. As shown, the leading edge of the cleaning bar 188 will scoop out each of the pockets 152 of the drum assembly 128 without contact with the vanes 148 or web segments 150 which would otherwise potentially jam the apparatus 100. Accordingly, the travel path 224 of the tips of the cleaning bars 188 is a function of the radius of the gear 210, radius of the pinion gear 212, 2 1 ~ 9 radius of the cleaning bar assembly 130 and radius of the drum assembly 128.
The apparatus 100, constructed to include a drum assembly 128 having straight vanes 148 and curved web segments 150, can employ a rotary cleaning bar assembly 130. Further, the apparatus 100 can be constructed to minimize the size of the drum assembly 128, while maximizing its material handling capacity.
For example, the length of the drum assembly 128 may be shortened by approximately 1/4 - 1/3 the length of the previous known drum assemblies without decrease in capacity. The shortening of the drum assembly length results in a corresponding decrease in seal area between the vanes 148 and housing 106 thereby substantially reducing potential leakage. Still further, the construction of the apparatus results in a more even discharge of material from the pockets 152 by action of the cleaning bar assembly 130 as the material is discharged over both sides of the cleaning bar assembly.
Although the invention herein has been described with references to particular embodiments, it is to be understood that the embodiments are merely illustrative of the principles and application of the present invention. It is therefore to be understood that numerous modifications may be made to the embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the claims.
Claims (24)
1. A rotary feeding apparatus comprising a housing having an inlet and an outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within said housing between said inlet and said outlet, said drum assembly including a plurality of elongated cavities circumferentially arranged, each of said cavities formed from a pair of spaced apart radially extending linear vanes and an intermediate curved web segment, a discharge assembly rotatably mounted adjacent said outlet of said housing for discharging material from said cavities, said discharge assembly including an elongated blade having an edge following a circular path within said cavities adjacent said vanes and said web segment for discharging material therefrom, and rotating means for rotating said drum assembly and said discharge assembly.
2. The apparatus of claim 1, wherein said drum assembly comprises a pair of spaced apart end plates having inner and outer surfaces, said inner surfaces opposing one another and having a plurality of radially arranged grooves for receiving said vanes and a plurality of recessed areas for receiving said web segments.
3. The apparatus of claim 2, further including a shaft extending through said end plates for rotation of said drum assembly .
4. The apparatus of claim 3, wherein said vanes are attached to said end plates and unattached to said shaft.
5. The apparatus of claim 2, 3 or 4, further including sealing means on said housing and said outer surface of said end plates for creating a seal thereat.
6. The apparatus of claim 5, wherein said sealing means comprises a first ring on an exterior portion of said housing, and a second ring on said outer surface of said end plates arranged concentric with said first ring to form an annular opening therebetween, and sealing material within said annular opening to create a seal between said first and second rings.
7. The apparatus of claim 1, 2, 3 or 4, wherein said curved web segment has a radius of curvature whereby an imaginary circle formed by said web segment has its circumference within said cavity adjacent said vanes.
8. A rotary feeding apparatus comprising a housing having an inlet and an outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within said housing between said inlet and said outlet, said drum assembly including a plurality of elongated cavities circumferentially arranged, each of said cavities formed from a pair of spaced apart radially extending vanes and an intermediate curved web segment having a center of its radius of curvature adjacent the circumference of said vanes, whereby an imaginary circle formed by said web segment has a portion of its circumference within said cavities adjacent said vanes, a discharge assembly rotatably mounted adjacent said outlet of said housing for discharging material within said cavities, said discharge assembly including an elongated blade having an edge following a circular path within said cavities adjacent said vanes and said web segments for discharging material therefrom, and means for rotating said drum assembly and said discharge assembly.
9. The apparatus of claim 8, wherein said imaginary circle formed by said curved web segment has at least a semicircular portion thereof contained within said cavity.
10. The apparatus of claim 8, wherein said vanes are linear, whereby said cavities have a straight portion defined by said vanes and a curved portion defined by said web segments.
11. The apparatus of claim 8, 9 or 10, wherein said drum assembly comprises a pair of spaced apart end plates having inner and outer surfaces, said inner surfaces opposing one another and having a plurality of radially arranged grooves for receiving said vanes and a plurality of recessed areas for receiving said web segments.
12. The apparatus of claim 11, further including a shaft extending through said end plates for rotation of said drum assembly.
13. The apparatus of claim 12, wherein said vanes are attached to said end plates and unattached to said shaft.
14. The apparatus of claim 11, further including sealing means on said housing and said outer surface of said end plates for creating a seal thereat.
15. The apparatus of claim 14, wherein said sealing means comprises a first ring on an exterior portion of said housing, and a second ring on said outer surface of said end plates arranged concentric with said first ring to form an annular opening therebetween, and sealing material within said annular opening to create a seal between said first and second rings.
16. The apparatus of claim 11, wherein said housing includes an opening sized to receive said drum assembly therethrough.
17. A rotary feeding apparatus comprising a housing having an inlet and outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within said housing between said inlet and said outlet, said drum assembly including a plurality of elongated cavities circumferentially arranged, a pair of spaced apart end plates having inner and outer surfaces, said inner surfaces having a plurality of radially arranged grooves and a plurality of recessed areas therebetween, each of said cavities formed from a pair of spaced apart radially extending vanes received within said grooves and an intermediate curved web segment received within said recessed areas, a discharge assembly rotatably mounted adjacent said outlet of said housing for discharging material within said cavities, said discharge assembly including an elongated blade having an edge following a circular path within said cavities adjacent said vanes and said web segment for discharging material therefrom, and means for rotating said drum assembly and said discharge assembly.
18. The apparatus of claim 17, further including a shaft extending through said end plates for rotation of said drum assembly.
19. The apparatus of claim 18, wherein said vanes are attached to said end plates and unattached to said shaft.
20. The apparatus of claim 17, 18 or 19, further including sealing means on said housing and said outer surface of said end plates for creating a seal thereat.
21. The apparatus of claim 20, wherein said sealing means comprises a first ring on an exterior portion of said housing, and a second ring on said outer surface of said end plates arranged concentric with said first ring to form an annular opening therebetween, and sealing material within said annular opening to create a seal between said first and second rings.
22. The apparatus of claim 17, 18 or 19, wherein said cavities approximate a semicircle in cross-section.
23. A rotary feeding apparatus comprising a housing having an inlet and outlet for the passage of material therethrough, a cylindrical drum assembly rotatably mounted within said housing between said inlet and said outlet, said housing having an opening sized to receive said drum assembly therethrough, said drum assembly including a plurality of elongated cavities circumferentially arranged about said drum assembly, a pair of spaced apart end plates having inner and outer surfaces, said inner surfaces having a plurality of radially arranged grooves and a plurality of recessed areas therebetween, each of said cavities formed from a pair of spaced apart radially extending linear vanes received within said grooves and an intermediate curved web segment received within said recessed areas, said curved web segment having a center of its radius of curvature adjacent the circumference of said vanes whereby an imaginary circle formed by said web segment has a portion of its circumference within said cavities adjacent said vanes, a discharge assembly rotatably mounted adjacent said outlet of said housing for discharging material within said cavities, said discharge assembly including a pair of elongated blades each having an edge following a circular path within said cavities adjacent said vanes and said web segment for discharging material therefrom, and means for simultaneously rotating said drum assembly and said discharge assembly.
24. The apparatus of claim 23, wherein said imaginary circle formed by said curved web segment has at least a semicircular portion thereof contained within said cavity.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20865194A | 1994-03-09 | 1994-03-09 | |
| US08/208,651 | 1994-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2124099A1 true CA2124099A1 (en) | 1995-09-10 |
Family
ID=22775444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2124099 Abandoned CA2124099A1 (en) | 1994-03-09 | 1994-05-20 | Volumetric airlock feeder |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2124099A1 (en) |
| DE (1) | DE9408383U1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105600319A (en) * | 2016-02-24 | 2016-05-25 | 青岛达能环保设备股份有限公司 | Disc-type electric feeding system |
| EP3440436A4 (en) * | 2016-04-03 | 2020-03-25 | Treitel Chemical Engineering Ltd. | Apparatus and method for dosaging powdered or granulated material |
| US11927507B2 (en) | 2018-04-12 | 2024-03-12 | Pharma and Nutraceutical PD Pty Ltd | Sampling device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3488673B2 (en) | 2000-05-17 | 2004-01-19 | 広洋工業株式会社 | Artificial snow quantitative transfer rotary valve |
| DE10351164B4 (en) * | 2003-11-03 | 2006-12-28 | Snow + Promotion Gmbh | Device for discharging crushed ice, in particular flake ice or uses in a snow machine |
-
1994
- 1994-05-20 CA CA 2124099 patent/CA2124099A1/en not_active Abandoned
- 1994-05-20 DE DE9408383U patent/DE9408383U1/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105600319A (en) * | 2016-02-24 | 2016-05-25 | 青岛达能环保设备股份有限公司 | Disc-type electric feeding system |
| EP3440436A4 (en) * | 2016-04-03 | 2020-03-25 | Treitel Chemical Engineering Ltd. | Apparatus and method for dosaging powdered or granulated material |
| US11274953B2 (en) | 2016-04-03 | 2022-03-15 | Treitel Chemical Engineering Ltd. | Apparatus and method for dosaging powdered or granulated material |
| US11624642B2 (en) | 2016-04-03 | 2023-04-11 | Treitel Chemical Engineering Ltd. | Apparatus and method for dosaging powdered or granulated material |
| US11927507B2 (en) | 2018-04-12 | 2024-03-12 | Pharma and Nutraceutical PD Pty Ltd | Sampling device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE9408383U1 (en) | 1994-07-28 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| FZDE | Dead |