CA1197536A - Vibrating pressurized feeder system for coarse, abrasive materials - Google Patents
Vibrating pressurized feeder system for coarse, abrasive materialsInfo
- Publication number
- CA1197536A CA1197536A CA000420590A CA420590A CA1197536A CA 1197536 A CA1197536 A CA 1197536A CA 000420590 A CA000420590 A CA 000420590A CA 420590 A CA420590 A CA 420590A CA 1197536 A CA1197536 A CA 1197536A
- Authority
- CA
- Canada
- Prior art keywords
- blow
- pot
- solids
- slide valve
- conduit
- 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.)
- Expired
Links
Classifications
-
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
Apparatus and method for conveying abrasive solids to a backfilling location wherein the solid materials are delivered to a blow-pot type loader, a vibratory feeder receives the discharge from the loader, and delivers the same to a pressurized conduit where air under pressure suspends the solid material and delivers it to the backfill location. The specific improvement of the present invention is concerned with a reciprocable slide valve which is disposed between the delivery means and the loader, the slide valve providing a substantially air-tight closure for the loader and eliminating the necessity for rotary feeding and metering apparatus which are subject to frequent replacement and repair.
Apparatus and method for conveying abrasive solids to a backfilling location wherein the solid materials are delivered to a blow-pot type loader, a vibratory feeder receives the discharge from the loader, and delivers the same to a pressurized conduit where air under pressure suspends the solid material and delivers it to the backfill location. The specific improvement of the present invention is concerned with a reciprocable slide valve which is disposed between the delivery means and the loader, the slide valve providing a substantially air-tight closure for the loader and eliminating the necessity for rotary feeding and metering apparatus which are subject to frequent replacement and repair.
Description
B~R~OUND OF ~HE ~ ION
Fi~ld of the Invention This invention i8 in ~he field of conveying solids in a batch type process wherein said solids are delivered through ~ slide ~al~e, and t:hen dr~pped through an opening in a blow tank, whereupon ~ley are vibrated and diacharged into a pressurized airstream.
Descxiption of the Prior Art In the mining of ooal or metals, there are sub-sta~tial environmental and saety hazards which relate to the disposa~ of the waste material produ~ed during under ground mining. ~he problem is particularly severe where the was~e material is a hard rock ~uch as the high densi~y quartæ which is a by,product of gold mining. Lifting the rock to the ~urface for disposal involves great expense, particularly since some gold mine6 are many thousands of ~eet below the surface of ~he earth. Even if ~he rock is lifted to the sur~ace, ik must then be stored somewhere and thiR o~ten creates an e~vironmental pxoblem. ~urther-more, deep mines become ~uite hot, and the areas where ~he roGk has been removed must be ventilated and cooled, considerably increasing *he cos~ of ~he mining operation.
Orle o:~ the most serious hazards in mining is known a~ "rock burst"O As the depth of the mine increases, the pressure increaees and the stresses on the rock at the sides and in the roof of ~:he mined out areas al~o increase. When the ~tre~s reaches the limit whit::h the roc}c can s~and, it ,. ~
: ' ~imply explode~ e~r bur~ts.
A8 ~oon as ~rl area is min~d, compxession of the ~ide walls and a ~agging of the roof begin, creating a condition known as n closure " . As t.he amount o:E ~losure increases 7 rock ~re~s increases . Blowing was te rock in at very high ~relc cities and pac:king in this material up to the roof before c:losure becclmes appreciable causes the packed material ~o compre~s with su}: s~quent closure and gradually carry the load of the unsupported material. Filling the mined out areas pneum~tically will pack the fill material to densities approaching 80~ of the original rock density, thereby reducing c:losure to about 20~ With other types of supports, such as timber pac:ks and the like, closure is as high as 75~
The most desirable solution is thus to extract the ore and move the waste rock around underground to areas which have been previous ly mined . This e l; m; n~tes the expense and ~he problems associa~ed with bringing the rock to the suxface. It also reduces the volume o~ the mine which has to be ventilated and cooled/ and further has the additional }:enefi~ of decreasing the length of mine cavities which have to be shored up wi th timbers ~o prevent collapse, a time consuming and expensive procedure.
Co~nercial . -chinery for moving rock around in a mine normally utilize& a rotary fe~3ding arld metering apparatus which operates continlaously. The was~e rock is metered in o a pipe and is blown to a remo~e lucation where it is piled into ~o~called "~topes n which are exca~ations resulting from the removal of ore.
1l The difficulty with rotary feeders in ~his environment is that they havle a very short service life and are impractical. ~igh density quartz rock, for example, is very abrasive. Since the vanes on rotary feeders are continuously rotating, the rate of wear is greatly accele-rated. In order to reduce wear, rotary feeders are often operated with air pressures in the conveying pipes of ahout 5 to 6 psig. This pressurized air is introduced on the upstream side of the rotary feeders to carry the rock alona the pipe for conveyance to a remote location for backfilling a stope. Lower air pressures are used to minimize damace to rotary air locks and lower pressures require larger diameter pipes, which are more costly and difficult to handle to convey the same amount of material The followinc U.S. paten~s are of general interest in connection with the handling of solid residues by means of fluid 6treams.
Adams et al U.S. Patent No. 1,347,358 describes a lifting apparatus for solids makinc use of a closed receiver and a plurality of air pipes which act on the material to loosen and break up the mass to such an extent that it will enter into the lower open end of a discharge pipe.
Bucky U.SO Patent No. 2,536,869 involves first breaking the ground by a modified shrinkage method of stoping, and then introducing waste fill at the top of the stope as the fragmented ore is withdrawn from the bottom and as its upper surfaLce subsides within the stope.
In U.5. Patent No. 3,~S3,B65 to Kanics there i5 a~¢ribed ~ pneumatic: conveyor pipe line or ~onveying bulk material utilizing passageway~ whi ::h corlnect the ~as duct to the bulk material duct ~I.oughout the length of ~,the conveyor pipe line.
V. S . Patent No. 3, 268, 264 to Squires also deals with a pneumatic c:onveyor in which the ~olid flows through the conveyor in a dense state reseI~ling a liquid-lilce i~ low .
Brown ~3.S. Patent NoO 3,268,266 is also directed to a pneumatic conveyor system utilizing a rotary feeder.
The vane~ s~f the eeder are provided with wipers at their extremities. The hu~ o~ the rotor is provided with caps which have fingers entering into the ~paces between the vanes and which carry annular ribs which are radially spaced to provide a se2~1 between the rotor arld a lining o synthetic resin which faces the end w~116 of the chamber.
Andy U~ S, Patent No. 3, 478, 520 addreeses itself to a method of filling mine cavities by means of a filler materlal ~uch as an expandable plastic. The expandable material is placed in the abandoned mine cavity, and suffi-s::ient he~t i5 applied to cause the material to expand and completely fill the cavities to thereby reinforce the gxourld above it.
Freeman, Jr. et al U.Sc Patent No. 3~480~331 descrlbes a fluidizing conveyor apparatus including a gate valve fox metering the ~low of fluidi~ed material aïong the conv~yor. The gate valve ha~ a blade whi~h moves vextically to ad~ust ~he size of the passage through which tha ~luidized ~aterial fl~wso Velegol U.S. Patent Mo. 3,~02,551 deal6 with an un~erground fluid ~or,veyor t:ran~portation sy~tem particularly designed for removing fines ,~nd the like from coal mining installations.
Schumacher et al U.S. Patent No. 3,656,661 describ~s a mea~uring device for a penumatically operated system in~luding a compar~mentali2ed dosage disk which has a discharge side leading to an air duc~ wi~h an ejector unit mounted therein. This side is sealed by a flexible lip seal and the reverse side is sealed by a ga~ket. The di~charge side of the dosage disk is an area of low pressure so that the granular material is drawn into the conveyor ct.
Rusterholz.U.S. PatQnt No. 3~871,711 describes a method for pneumatically conveying solid materials by means of gas jets located along a conveying pipeline.
Valves are provided for synchxonizing the ga~ jets with the clo~ing of each pipeline section to cause an ~ntermittent movement of the ~iscret~ solid material along the pipeline.
In Korn et al UOS. Patent No. 3,937,522 there i~ described an appaxatus for continuously feeding gra~ular material to a conveyor pipeline which includes a vertical cylindrical ch~mber with mean~ in the chamber at different levels which act to alternately lift and release successiv~
portions o:E the material, thereby preventing grains from interlocking and forming lumpsO
3L~$~,~
~ n Ru~ter~lz IJ~Sa P3~ten~ No. 3,955,853 there is dLisclosed a ~y~tem or the pneumatic con~yance of ~olid ma~t~3rial~ by pneumatic pul~e waves without ~he nec:e6sity of presæurizing the container.
Finally, in Waymerlt l~.S, Patant NoO 4~059~963 there is described a method of backfilling a mir~e by dewatering a ~lurry ~o that it ean be u~ed more conveniently as a baeJcfill either alone or in combination with cement to provide a mortar~
~UM~RY 0~ T~F. lNV ~:N'l'ION
The present invention provides an apparatus ~or conveying abrasive solids to a backfilling locatioll utilizing a blow-pot type loadex, and means for deli srering solids ~o the loader. A vibratory ~eeder receives the ~ischaxge from the loader and delivers the same to a pressurized conduit at a very accurately controllable xate e~f delivery. The present invention employs a reciprocahle slide valve which is disposed between the delivery means ar~d the loader I ~he slide valve when closed prc~vidiIIg a substantially air-tight closure for the loader. The loader as well as the conduit may be pre3surized c In a pr~erred ~orm of the inventior~, the loader has a generally conical disch~rge end and a vi}: ratory f~eder is located in ~::lose proximity to ~he discharge end.
The ~ibratory feeder is preîerably loca~ed in a pre~;surized housing of its own.
The pre.~ent ir~vention also provides a method for s~onveying abrasive 601ids wherein 5UC~ ;olids are delivered through a slide valve and into a blo~ kank, the solids are vibrated while they are being discharged from the blow tank into a conduit, and then conveyed by means of pressurized air to the backfill location. In a preferred form of the invention, the air is in~roduced into the conduit in suffi-cient amounts to form a suspension containing about 3% to 10 bv volume solids. One of the features of the invention is that higher pressures can be used in conveying, the pressures in the conduit being at least 10 psig.
BRIEF DESCRIPTION OF THE DP~WINGS
A further description of the present invention will be made in conjunction with the attached sheets of drawings, in which.
~ IG. 1 is a view partly in elevation and partly in cross section illustrating a conveyor assembly according to the present invention;
FIG. 2 is a cross-sectional view taken substantially along the line II-II;
FIG. 3 is a plan view of the slide valve; and FIG. 4 is a fragmentary cross-sectional view of the slide valve assembly used in accordance with the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1, reference numeral 10 indica~es generally a support structure including a plurality of legs 11 and 12 for positioning a dispensing device relative to a pressurized conduit 13. A rock material in the form of granules or the like is delivered by means of a conveyor (not shown) to a hopper 14 whieh is securely mounted to a pair of opposed channel beams 15 and 16. The bottom for the hopper is provided by a reciprocable slide valve 17. As best seen in FIGS. 2 and 4, the slide valve 17 is arranged to slide between opposite sets of plates 18 and 19~ A hydraulic cylinder 2~ has a piston 21 mounted for reciprocation therein, the piston 21 carrying an actuating rod 22 which is connected to the slide valve 17 by means of a connector 23 as shown in ~IG. 3. The other end of the cylinder 20 i5 fixedly secured to the frame by means of a connection 24.
The actuator or the slide valve 17, including the hydxaulic cylinder 20 and its operative parts are supported by means of supexstructure 25.
The slide valve 17 also forms an air-tight closure for a blow-pot feeder generally indicated at reference numeral 26. The blow-pot feeder 26 has a flange 27 which is also arranged to be secured to the superstructure 25.
The blow~pot feeder 26 has a generally conical bottom 28 which discharges into a vibrating tray Z9 of a vibrating type feeder such as the commercially available "Syntron" feeders. The feeder is actuated by a motor 30 which is enclosed in its own pressurized housing 32.
A spring 31 serves to isolate ~he motor 30 from the housing 32.
shaft 33 transmits high requency, low amplitude pulsations from the mol:or 30 to the vibrating tray 29. The tray 29 is likewise isolated mechanically from i~s support by means o a spring 34 extending between the tray 29 and the conduit 13. It will also be noted that the forward edge 29a of the tray 29 extends beyond the intersection of the tray wi~h ~he angle of repose identified at reference numeral 35.
The ma~erial falling through the feeder will not be entrained in the airstream in the conduit 13 until the vibrating feeder is started.
Pressuri~ed air is applied into the conduit by means of a blower 36. The same blower may supply air under pressure to the blow-pot feeder 26 by means of an inlet line 37.
~ he blower 36 provides air in sufficient volume to form a suspension containing about 3% to 10% by volume solids. The suspension is conveyed through the conduit 13 at a pressure of at least 10 psig, and typically about 11 to 12 psig. This permits a smaller diameter conduit 13 to be used, the typical conduit being about 8 inches in diameter. At an air velocity in the conduit of about 120 to 150 ft/sec, the equipment can convey about 30 to 50 tons per hour. The conduit is shown discharging into a heap 38 which is backfilling a mined out axea.
The sequence of operation of the assembly is as follows~ The blower 36 is started with no air passing through conduit 13 and the slide valve 17 is opened. rrhe blow-pot 26 is filled, and the slide valve 17 is closed.
The filling of ~he blow~pot is controlled either by weighing the flow on the conveyor belt or by running the belt for a specific time. After slide valve 17 closes, suitable valves (not shown) are opened so that the airflow passes into the conveying conduit 13. The vibrating pan feeder motor 30 i5 started zmd i8 run until the blow-pot 26 is empty. The ~p~
vibrati~y feeder i~ then ~hu~ off an~ the system is ready ~or anoth~r ~y~le.
In a~cordance wi~h Wle present invention, thP
expensive rotary air lock previously used in such ~ystems ha~ been eliminated and replaced with a simple and inexpensive slida valve. Such valYes operate only once per cycle which usually means ~bout once every 3 or 4 minutes. Such slide Valvas, ~herefore, do not ex]p2rience the wear of rotary air locks whi~h are operating con~inuously.
The slide valve operates only when the air has been cuk off fxom the 3ys~eml and ~his also reduces wear.
In contrast, rotary air locks operate continuously at full s~stem operating pressure. Furthermore, the wearing surfaces on the slide valve are flat plates or strips which are inexp~nsive and are easy to replace. Air leakage through he slide va~ve of this system i5 also substantially l~ss than leakage through a rotary feeder. Power require-ments for the feeder are quite small.
I~ should be evidant that various modifications can be made t~ the described embodiments without daparting from the scope of the present invention.
Fi~ld of the Invention This invention i8 in ~he field of conveying solids in a batch type process wherein said solids are delivered through ~ slide ~al~e, and t:hen dr~pped through an opening in a blow tank, whereupon ~ley are vibrated and diacharged into a pressurized airstream.
Descxiption of the Prior Art In the mining of ooal or metals, there are sub-sta~tial environmental and saety hazards which relate to the disposa~ of the waste material produ~ed during under ground mining. ~he problem is particularly severe where the was~e material is a hard rock ~uch as the high densi~y quartæ which is a by,product of gold mining. Lifting the rock to the ~urface for disposal involves great expense, particularly since some gold mine6 are many thousands of ~eet below the surface of ~he earth. Even if ~he rock is lifted to the sur~ace, ik must then be stored somewhere and thiR o~ten creates an e~vironmental pxoblem. ~urther-more, deep mines become ~uite hot, and the areas where ~he roGk has been removed must be ventilated and cooled, considerably increasing *he cos~ of ~he mining operation.
Orle o:~ the most serious hazards in mining is known a~ "rock burst"O As the depth of the mine increases, the pressure increaees and the stresses on the rock at the sides and in the roof of ~:he mined out areas al~o increase. When the ~tre~s reaches the limit whit::h the roc}c can s~and, it ,. ~
: ' ~imply explode~ e~r bur~ts.
A8 ~oon as ~rl area is min~d, compxession of the ~ide walls and a ~agging of the roof begin, creating a condition known as n closure " . As t.he amount o:E ~losure increases 7 rock ~re~s increases . Blowing was te rock in at very high ~relc cities and pac:king in this material up to the roof before c:losure becclmes appreciable causes the packed material ~o compre~s with su}: s~quent closure and gradually carry the load of the unsupported material. Filling the mined out areas pneum~tically will pack the fill material to densities approaching 80~ of the original rock density, thereby reducing c:losure to about 20~ With other types of supports, such as timber pac:ks and the like, closure is as high as 75~
The most desirable solution is thus to extract the ore and move the waste rock around underground to areas which have been previous ly mined . This e l; m; n~tes the expense and ~he problems associa~ed with bringing the rock to the suxface. It also reduces the volume o~ the mine which has to be ventilated and cooled/ and further has the additional }:enefi~ of decreasing the length of mine cavities which have to be shored up wi th timbers ~o prevent collapse, a time consuming and expensive procedure.
Co~nercial . -chinery for moving rock around in a mine normally utilize& a rotary fe~3ding arld metering apparatus which operates continlaously. The was~e rock is metered in o a pipe and is blown to a remo~e lucation where it is piled into ~o~called "~topes n which are exca~ations resulting from the removal of ore.
1l The difficulty with rotary feeders in ~his environment is that they havle a very short service life and are impractical. ~igh density quartz rock, for example, is very abrasive. Since the vanes on rotary feeders are continuously rotating, the rate of wear is greatly accele-rated. In order to reduce wear, rotary feeders are often operated with air pressures in the conveying pipes of ahout 5 to 6 psig. This pressurized air is introduced on the upstream side of the rotary feeders to carry the rock alona the pipe for conveyance to a remote location for backfilling a stope. Lower air pressures are used to minimize damace to rotary air locks and lower pressures require larger diameter pipes, which are more costly and difficult to handle to convey the same amount of material The followinc U.S. paten~s are of general interest in connection with the handling of solid residues by means of fluid 6treams.
Adams et al U.S. Patent No. 1,347,358 describes a lifting apparatus for solids makinc use of a closed receiver and a plurality of air pipes which act on the material to loosen and break up the mass to such an extent that it will enter into the lower open end of a discharge pipe.
Bucky U.SO Patent No. 2,536,869 involves first breaking the ground by a modified shrinkage method of stoping, and then introducing waste fill at the top of the stope as the fragmented ore is withdrawn from the bottom and as its upper surfaLce subsides within the stope.
In U.5. Patent No. 3,~S3,B65 to Kanics there i5 a~¢ribed ~ pneumatic: conveyor pipe line or ~onveying bulk material utilizing passageway~ whi ::h corlnect the ~as duct to the bulk material duct ~I.oughout the length of ~,the conveyor pipe line.
V. S . Patent No. 3, 268, 264 to Squires also deals with a pneumatic c:onveyor in which the ~olid flows through the conveyor in a dense state reseI~ling a liquid-lilce i~ low .
Brown ~3.S. Patent NoO 3,268,266 is also directed to a pneumatic conveyor system utilizing a rotary feeder.
The vane~ s~f the eeder are provided with wipers at their extremities. The hu~ o~ the rotor is provided with caps which have fingers entering into the ~paces between the vanes and which carry annular ribs which are radially spaced to provide a se2~1 between the rotor arld a lining o synthetic resin which faces the end w~116 of the chamber.
Andy U~ S, Patent No. 3, 478, 520 addreeses itself to a method of filling mine cavities by means of a filler materlal ~uch as an expandable plastic. The expandable material is placed in the abandoned mine cavity, and suffi-s::ient he~t i5 applied to cause the material to expand and completely fill the cavities to thereby reinforce the gxourld above it.
Freeman, Jr. et al U.Sc Patent No. 3~480~331 descrlbes a fluidizing conveyor apparatus including a gate valve fox metering the ~low of fluidi~ed material aïong the conv~yor. The gate valve ha~ a blade whi~h moves vextically to ad~ust ~he size of the passage through which tha ~luidized ~aterial fl~wso Velegol U.S. Patent Mo. 3,~02,551 deal6 with an un~erground fluid ~or,veyor t:ran~portation sy~tem particularly designed for removing fines ,~nd the like from coal mining installations.
Schumacher et al U.S. Patent No. 3,656,661 describ~s a mea~uring device for a penumatically operated system in~luding a compar~mentali2ed dosage disk which has a discharge side leading to an air duc~ wi~h an ejector unit mounted therein. This side is sealed by a flexible lip seal and the reverse side is sealed by a ga~ket. The di~charge side of the dosage disk is an area of low pressure so that the granular material is drawn into the conveyor ct.
Rusterholz.U.S. PatQnt No. 3~871,711 describes a method for pneumatically conveying solid materials by means of gas jets located along a conveying pipeline.
Valves are provided for synchxonizing the ga~ jets with the clo~ing of each pipeline section to cause an ~ntermittent movement of the ~iscret~ solid material along the pipeline.
In Korn et al UOS. Patent No. 3,937,522 there i~ described an appaxatus for continuously feeding gra~ular material to a conveyor pipeline which includes a vertical cylindrical ch~mber with mean~ in the chamber at different levels which act to alternately lift and release successiv~
portions o:E the material, thereby preventing grains from interlocking and forming lumpsO
3L~$~,~
~ n Ru~ter~lz IJ~Sa P3~ten~ No. 3,955,853 there is dLisclosed a ~y~tem or the pneumatic con~yance of ~olid ma~t~3rial~ by pneumatic pul~e waves without ~he nec:e6sity of presæurizing the container.
Finally, in Waymerlt l~.S, Patant NoO 4~059~963 there is described a method of backfilling a mir~e by dewatering a ~lurry ~o that it ean be u~ed more conveniently as a baeJcfill either alone or in combination with cement to provide a mortar~
~UM~RY 0~ T~F. lNV ~:N'l'ION
The present invention provides an apparatus ~or conveying abrasive solids to a backfilling locatioll utilizing a blow-pot type loadex, and means for deli srering solids ~o the loader. A vibratory ~eeder receives the ~ischaxge from the loader and delivers the same to a pressurized conduit at a very accurately controllable xate e~f delivery. The present invention employs a reciprocahle slide valve which is disposed between the delivery means ar~d the loader I ~he slide valve when closed prc~vidiIIg a substantially air-tight closure for the loader. The loader as well as the conduit may be pre3surized c In a pr~erred ~orm of the inventior~, the loader has a generally conical disch~rge end and a vi}: ratory f~eder is located in ~::lose proximity to ~he discharge end.
The ~ibratory feeder is preîerably loca~ed in a pre~;surized housing of its own.
The pre.~ent ir~vention also provides a method for s~onveying abrasive 601ids wherein 5UC~ ;olids are delivered through a slide valve and into a blo~ kank, the solids are vibrated while they are being discharged from the blow tank into a conduit, and then conveyed by means of pressurized air to the backfill location. In a preferred form of the invention, the air is in~roduced into the conduit in suffi-cient amounts to form a suspension containing about 3% to 10 bv volume solids. One of the features of the invention is that higher pressures can be used in conveying, the pressures in the conduit being at least 10 psig.
BRIEF DESCRIPTION OF THE DP~WINGS
A further description of the present invention will be made in conjunction with the attached sheets of drawings, in which.
~ IG. 1 is a view partly in elevation and partly in cross section illustrating a conveyor assembly according to the present invention;
FIG. 2 is a cross-sectional view taken substantially along the line II-II;
FIG. 3 is a plan view of the slide valve; and FIG. 4 is a fragmentary cross-sectional view of the slide valve assembly used in accordance with the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1, reference numeral 10 indica~es generally a support structure including a plurality of legs 11 and 12 for positioning a dispensing device relative to a pressurized conduit 13. A rock material in the form of granules or the like is delivered by means of a conveyor (not shown) to a hopper 14 whieh is securely mounted to a pair of opposed channel beams 15 and 16. The bottom for the hopper is provided by a reciprocable slide valve 17. As best seen in FIGS. 2 and 4, the slide valve 17 is arranged to slide between opposite sets of plates 18 and 19~ A hydraulic cylinder 2~ has a piston 21 mounted for reciprocation therein, the piston 21 carrying an actuating rod 22 which is connected to the slide valve 17 by means of a connector 23 as shown in ~IG. 3. The other end of the cylinder 20 i5 fixedly secured to the frame by means of a connection 24.
The actuator or the slide valve 17, including the hydxaulic cylinder 20 and its operative parts are supported by means of supexstructure 25.
The slide valve 17 also forms an air-tight closure for a blow-pot feeder generally indicated at reference numeral 26. The blow-pot feeder 26 has a flange 27 which is also arranged to be secured to the superstructure 25.
The blow~pot feeder 26 has a generally conical bottom 28 which discharges into a vibrating tray Z9 of a vibrating type feeder such as the commercially available "Syntron" feeders. The feeder is actuated by a motor 30 which is enclosed in its own pressurized housing 32.
A spring 31 serves to isolate ~he motor 30 from the housing 32.
shaft 33 transmits high requency, low amplitude pulsations from the mol:or 30 to the vibrating tray 29. The tray 29 is likewise isolated mechanically from i~s support by means o a spring 34 extending between the tray 29 and the conduit 13. It will also be noted that the forward edge 29a of the tray 29 extends beyond the intersection of the tray wi~h ~he angle of repose identified at reference numeral 35.
The ma~erial falling through the feeder will not be entrained in the airstream in the conduit 13 until the vibrating feeder is started.
Pressuri~ed air is applied into the conduit by means of a blower 36. The same blower may supply air under pressure to the blow-pot feeder 26 by means of an inlet line 37.
~ he blower 36 provides air in sufficient volume to form a suspension containing about 3% to 10% by volume solids. The suspension is conveyed through the conduit 13 at a pressure of at least 10 psig, and typically about 11 to 12 psig. This permits a smaller diameter conduit 13 to be used, the typical conduit being about 8 inches in diameter. At an air velocity in the conduit of about 120 to 150 ft/sec, the equipment can convey about 30 to 50 tons per hour. The conduit is shown discharging into a heap 38 which is backfilling a mined out axea.
The sequence of operation of the assembly is as follows~ The blower 36 is started with no air passing through conduit 13 and the slide valve 17 is opened. rrhe blow-pot 26 is filled, and the slide valve 17 is closed.
The filling of ~he blow~pot is controlled either by weighing the flow on the conveyor belt or by running the belt for a specific time. After slide valve 17 closes, suitable valves (not shown) are opened so that the airflow passes into the conveying conduit 13. The vibrating pan feeder motor 30 i5 started zmd i8 run until the blow-pot 26 is empty. The ~p~
vibrati~y feeder i~ then ~hu~ off an~ the system is ready ~or anoth~r ~y~le.
In a~cordance wi~h Wle present invention, thP
expensive rotary air lock previously used in such ~ystems ha~ been eliminated and replaced with a simple and inexpensive slida valve. Such valYes operate only once per cycle which usually means ~bout once every 3 or 4 minutes. Such slide Valvas, ~herefore, do not ex]p2rience the wear of rotary air locks whi~h are operating con~inuously.
The slide valve operates only when the air has been cuk off fxom the 3ys~eml and ~his also reduces wear.
In contrast, rotary air locks operate continuously at full s~stem operating pressure. Furthermore, the wearing surfaces on the slide valve are flat plates or strips which are inexp~nsive and are easy to replace. Air leakage through he slide va~ve of this system i5 also substantially l~ss than leakage through a rotary feeder. Power require-ments for the feeder are quite small.
I~ should be evidant that various modifications can be made t~ the described embodiments without daparting from the scope of the present invention.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for conveying abrasive solids to a backfilling location including a blow-pot, means for pressurizing the interior of said blow-pot, delivery means for delivering said solids to said blow-pot, a vibratory feeder receiving the discharge from said blow-pot, a pressurized housing enclosing said vibratory feeder, pressurized conduit receiving the discharge from said feeder, a reciprocable slide valve disposed between said delivery means and said blow-pot, said slide valve when closed providing a substantially air-tight closure for said blow-pot, and hydraulic means coupled to said slide valve for opening and closing the same.
2. An apparatus according to claim 1 in which said blow-pot has a generally conical discharge end and said vibratory feeder is located in close proximity to said discharge end.
3. A method for conveying abrasive solids which comprises:
dropping said solids through an open slide valve, delivering said solids into a blow-pot, vibrating the solids to discharge the same from said blow-pot into a conduit, and introducing air under pressure into said conduit at a pres-sure of at least 10 psig and at a sufficient mass velocity to propel said solids as a suspension contain-ing about 3% to 10% by volume solids through said conduit.
dropping said solids through an open slide valve, delivering said solids into a blow-pot, vibrating the solids to discharge the same from said blow-pot into a conduit, and introducing air under pressure into said conduit at a pres-sure of at least 10 psig and at a sufficient mass velocity to propel said solids as a suspension contain-ing about 3% to 10% by volume solids through said conduit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34926982A | 1982-02-16 | 1982-02-16 | |
| US349,269 | 1982-02-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1197536A true CA1197536A (en) | 1985-12-03 |
Family
ID=23371611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000420590A Expired CA1197536A (en) | 1982-02-16 | 1983-01-31 | Vibrating pressurized feeder system for coarse, abrasive materials |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU1143783A (en) |
| CA (1) | CA1197536A (en) |
| GB (1) | GB2114526A (en) |
| ZA (1) | ZA83669B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2145389B (en) * | 1983-08-26 | 1987-10-28 | Ben Joseph Gallant | Apparatus for feeding particulate materials |
| US4708534A (en) * | 1983-09-30 | 1987-11-24 | Airsonics License Partnership | Particle feed device with reserve supply |
| GB9213188D0 (en) * | 1992-06-22 | 1992-08-05 | Solinst Canada Ltd | Introduction of particulate material into a borehole |
| US6417464B2 (en) | 1999-08-23 | 2002-07-09 | Dynamic Air, Inc. | Extended range feeders |
| CN102079447A (en) * | 2010-11-08 | 2011-06-01 | 迟浩德 | Automatic grain discharging device |
-
1983
- 1983-01-31 CA CA000420590A patent/CA1197536A/en not_active Expired
- 1983-02-01 ZA ZA83669A patent/ZA83669B/en unknown
- 1983-02-15 GB GB08304128A patent/GB2114526A/en not_active Withdrawn
- 1983-02-15 AU AU11437/83A patent/AU1143783A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB8304128D0 (en) | 1983-03-16 |
| AU1143783A (en) | 1983-08-25 |
| GB2114526A (en) | 1983-08-24 |
| ZA83669B (en) | 1983-10-26 |
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|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |