CA1176671A - Grain handling apparatus with improved cyclone separator - Google Patents
Grain handling apparatus with improved cyclone separatorInfo
- Publication number
- CA1176671A CA1176671A CA000382769A CA382769A CA1176671A CA 1176671 A CA1176671 A CA 1176671A CA 000382769 A CA000382769 A CA 000382769A CA 382769 A CA382769 A CA 382769A CA 1176671 A CA1176671 A CA 1176671A
- Authority
- CA
- Canada
- Prior art keywords
- air
- housing
- conduit
- grain
- outlet
- 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
- B65G53/60—Devices for separating the materials from propellant gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
- B04C5/13—Construction of the overflow ducting, e.g. diffusing or spiral exits formed as a vortex finder and extending into the vortex chamber; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
- B04C5/15—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations with swinging flaps or revolving sluices; Sluices; Check-valves
-
- 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
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/28—Systems utilising a combination of gas pressure and suction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cyclones (AREA)
Abstract
Abstract of the Disclosure A positive displacement blower (35) creates a vacuum within separator housing (20). sulk material such as grain drawn in through the tangential inlet (25) is centrifugally separated and transferred into a discharge conduit (31) by a rotary airlock conveying valve (30) from where it is picked up and discharged by a flow of high pressure air from the blower (35). A baffle (50) is mounted in the separator housing (20) between the con-veying valve (30) and the axial air outlet (26) to block air which leaks through the conveying valve (30) and material carried thereby from directly entering the center of the vortex in the area of the air outlet conduit (26).
Description
`" ~ 3.7~7:~
GRAIN EIAN~LIN& APPARATUS
WITH IMPROVED CYCLONE SEPARATOR
Technical Field This invention relates generally to apparatus for pneumatically moving or conveying bulk material. More specifically, a baffle is provided in the cyclone sepa-rator of a grain conveyor which utilizes a positive dis-placement blower, and in which separated grain is removed from the separator by a rotary airlock conveying valve, to block particles blown upwardly by air leaking through the airlock from entering the center of the cyclone, thus dra-matically improving separating performance and reducing blower damage and wear.
Summary of the Invention Prior art pneumatic grain conveyors have util-ized cyclone separators to permit the grain to comple-tely bypass the fan or blower. The suction created by the fan draws both air and grain carried thereby into the sepa-rator. the grain which is centrifugally separated is removed from the separator through an airlock system where the air bein~ discharged from the fan conveys the grain to a discharge point. Positive displacement blowers, as opposed to fans, have been used to obtain larger capacity with lower horsepower requirements. In addition, blowers are smallerl resulting in a more compact unit which is easier to handle, and less grain damage is caused because 6 ~ ~
a system employing a blower can use smaller lines. A
negative factor is that blowers can be damaged if larger particles are not separated from the air stream. Dust which is picked up also causes wear to the rotors. To overcome -this problem, prior art pneumatic grain movers with blowers have used large filters in the cyclone sepa-rator to remove dust and grain not previously separated.
Such filters are not only cumbersome and require periodic cleaning, but also increase the pressure drop and reduce airflow through -the system. However, such filters have been necessary in order to prevent damage to the rotors of positive displacement blowers, which rotate within a cylinder with very small internal clearances.
It is applicant's discovery that such cumbersome filter arrangements can be eliminated by utilizing a baffle mounted within the separator to block a substantial area between the grain discharge outlet at the bottom of the separator and the air outlet located at the center of the cyclone. Because there is a substantial pressure difference existing across the airlock, there is some leakage of air into the separator which carries grain and foreign material with it upwardly into the separator where the clean air is being removed at the center of the vor-tex. In the prior art systems, a certain amount of this forei~n material was re-entrained in the air stream and carried into the fan. Although it is preferable to use a small safety filter with the present invention, the baffle has eliminated the need for elaborate filter arrangements, thereby dramatically increasing the cyclone separator's performance, which both increases the efficiency of the 1 1~6~1 system and reduces the likelihood of damage to the blower.
The present invention has its greatest utility when used in a system employing a positive displacement blower, but it can also be used with prior art systems employing fans to substantially reduce the amount of material being carried through the fan.
The present invention is directed to pneumatic grain moving apparatus, comprising a cyclone separator com-prising a housing having a wall formed about a longitudinal axis, the housing having a conical lower portion with a grain discharge outlet at a bottom end thereof, an air inlet and an air outlet in the housing, a grain discharge conduit adjacent the grain discharge outlet, means including rotary airlock means mounted in the grain discharge outlet for transferring grain from the housing to the discharge conduit, means including a positive displacement blower and conduit means for drawing a flow of air through the air outlet to thereby lower the pressure within the housing and generate a flow of air through the air inlet and the cyclone separator to form a vortex in the housing to separate grain carried into the housing through the air inlet with the air, and for discharging air taken by the air outlet from the center of the vortex through the discharge conduit to carry therewith the grain in the discharge conduit, a safety filter mounted in the conduit means between the air outlet and the blower, and a baffle mounted centrally within and spaced from the wall of the lower conical portion to block a substantial area within the grain discharge outlet and the air outlet.
i~
1 ~7~67 ~
Higher pressure air leaking into the housing through the airlock means, and grain and foreign material carried upwardly thereby are blocked by the baffle and prevented from directly entering the center of the vortex in the area of the air outlet.
The baffle may be a centrally positioned, circular baffle mounted within the lower portion of the cyclone separator`housing. The positive displacement blower may be a blower which draws air from the air outlet conduit and discharges the air into the grain discharge conduit, whereby the high pressure air in the discharge conduit which is periodically released into the housing by the rotary airlock means blows upwardly into the housing carrying with it por-tions of the material and foreign matter carried thereby.
The pneumatic grain moving apparatus may be port-able. The safety filter may be a small safety filter, com-prising a heavy mesh Ccreen offering little resistance to air flow. The safety filter may comprise a cylindrical screen offering little resistance to flow, mounted coaxially within the conduit means. The baffle may be flat and may be mounted centrally within and spaced from the wall of the lower conical portion of the separator housing.
Brief Description of the Drawings FIGURE 1 is a schematic representation of a con-ventional prior art pneumatic grain-handling system.
FIGURE 2 is a similar view in side elevation of the pneumatic grain-handling system of the present invention, portions thereof being broken away.
-3a-``:j 1 1 7~67 i FIGURE 3 is a sectional view taken along line 3 3 of FIGURE 2.
FIGURE 4 is a schematic view in cross-section of a rotary airlock conveying valve of the type used in the present invention.
FIGURE 5 is a schematic cross-sectional view of a positive displacement pump or blower of the type used in the present invention.
Description of the Preferred Embodiment FIGURE 1 depicts a prior art grain-moving system employing a fan. The fan 10 rotates at a high speed to draw air from the centrifugal separator 11 through the con-duit 12 to in turn draw air through the conduit and flexible hose 13. Grain is drawn by the moving air into the conduit 13 and enters the separator 11 through a tangential inlet which creates a vortex within the separator. The resulting centrifugal force applied to the grain causes it to move to the outside of the separator --------housing and swirl downwardly by gravity to a r~tary air-lock Gonveying valve 14. The incoming air continually moves to the cen-ter of the vortex and is pulled out through conduit 12 by the fan, which discharges the air through the discharge condui-t 15. The conveying valve 14 transfers the grain from -the separator 11 into the dis-charge conduit 15 where it is picked up by the air from the fan and carried to -the discharge hopper 16. This system permits -the grain to be easily transferred or moved by air, but the grain bypasses the fan so that it is not damaged in the process. The prior art grain mover shown in FIGURE 1 is a portable unit and the fan and rotary conveying val~e would typically be driven from the power take-off of a tractor. The system shown in FIGURE 1 does not need a filter because the cyclone separator removes substantially all of the grain and foreign material from the air stream, but to the extent that some material does pass through the fan, the fan is not damaged thereby.
FIGURE 2 discloses in somewhat schematic form a preferred embodiment of the present invention. The cyclone separator 20 includes an elongated housing formed about a vertical, longitudinal axis 21, the housing having walls forming a generally cylindrical upper portion 22, a truncated conical lower portion 23 and a top end wall 24.
Upper portion 22 has a tangential inle-t 25 in the wall thereof, and top end wall 24 has an axial outlet conduit 26, the bottom end of which terminates near the center of the upper portion 22.
The bottom end of lower portion 23 is provided with a separated material outlet opening which connects to 7 ~.
a rotary airlock conveying valve 30. The conveying valve 30 is designed to transfer separated material from sepa-rator 20 into a discharge conduit 31 while at the same time maintaining the pressure difference between the interior of the separator 20 and the discharge conduit 31.
A positive displacement pump or blower 35 has its intake connected by a suitable conduit 36 to the axial air outlet 26. Blower 35 discharges into discharge con-duit 31 creating a high-pressure air flow therethrough to pick up the grain transferred into it by the conveying valve 30 for distribution to a remote location through a continuation of the discharge conduit which is not shown.
FIGURE 4 depicts in schematic form a cross-sec-tion of a typical conveying valve 30. The conveying valve 30 has a rotor 32 with a plurality of spaced, flat blades 32a which form a plurality of spaced pockets 33. The edges of the blades 32a engage the inner wall of the housing of the valve 30 to prevent the pressurized air in the discharge conduit 31 from flowing back through the valve into the separator housing 20. It can be seen that as the rotor 32 is rotated, grain from the lower portion 23 of the housing is picked up by the pockets 33 and transferred to the base of the unit which is connected with suitable adaptors on each end to the air discharge line 31. The high-pressure air flowing through the dis-charge conduit 31 thus empties the pockets 33 as they reach the base of the unit. Although not shown on the drawings, the rotor 32 is driven either by an electric motor mounted on the unit or from -the power take-off of a tractor through a suitable chain drive or transmission.
~ ~7~7~
FIGURE 5 discloses schematically the principle of operation of the pump or blower 35. The blower is of the positive displacement type and has two figure-eight rotors 37 and 38, mounted as shown, which rotate in oppo-site direc-tions to carry air from the inlet 39 to the outlet 40. Each of the rotors 37 and 38 rotate within a cylindrical portion of the housing and very small clear-ances are provided between the two rotors and betw~en the two rotors and the housing. The air discharged from the outlet 40 will be at relatively high pressure, which ex-tends throughout the discharge system. Blowers or pumps of this nature are pref~rable to fans because greater air flow can be achieved with less horsepower. However, because of the critical tolerances within the blower, the blower must be protected from foreign material. Grain or pieces of other bulk material being handled can cause damage to the blower and even dust particles will cause wear to the rotors and to the walls of the blower housing.
To prevent such material from entering the blower 35, a baffle 50 has been mounted within lower portion 23 to block a substantial area between the mater-ial outlet and the air outlet conduit 26. In the pre-ferred embodiment, baffle 50 is a circular plate which is rigidly mounted to the bottom end of the outlet conduit 26 by a plurality of support rods 51, 52. Baffle 50 is preferably circular and is centered on axis 21, perpen-dicular thereto. The edge of baffle 50 is spaced from the wall of lower portion 23 to permit separa-ted material to pass therebetween. Thus, a generally ring-shaped opening, free of obstruction, is provided between the baffle 50 and ~ `~ 7 6 ~
lower portion 23 through which the separated grain can swirl downwardly toward the airlock 30.
Although baffle 50 has been found to be highly effective in preventing extraneous material from entering the air outlet 26, a safety or emergency filter 55 is mounted within -the conduit 36. Conduit 36 includes as a portion thereof a plexiglas tube 36a which is connec-ted into the line by means of clamps 56 and 57 to permit visual inspection of the filter 55. Filter 55 is a cylin-drical screen or mesh structure mounted coaxially withinconduit 36, having a closed upper end and an open bottom end. A baffle (not shown) is provided at the bottom end of the filter 55 between it and the conduit 36 so that air is forced to pass through the walls of filter 55 and be discharged axially therefrom. Filter 55 is constructed of a relatively heavy-mesh screen so that it offers little resistance to air flow. It is strictly a safety or emer-gency filter because in the present invention, virtually no particles are left in the air stream drawn from sepa-rator 20.
Operation Blower 35 creates suction in conduit 36 to drawair from separator housing 20 through axial outlet 26.
The vacuum thus created draws air into the housing through tangential inlet 25, creating a vortex about the axis 21.
Bulk material being carried into the housing through tangential inlet 25 is caused to swirl about the interior of the housing and gradually moves downwardly in a swirl-ing pattern toward the bottom of lower portion 23. The vortex has a relatively clear center from which air is 7 :1L
drawn into outlet 26. ~he separated material is carried by conveying valve 30 into discharge conduit 31 which carries a flow of high pressure air from the outlet of blower 35. It should be noted that a substantial pressure difference exists between the interior of housing 20 and the interior of discharge conduit 31. As a result, there is a strong tendency for high pressure air within dis-charge conduit 31 to force its way through the conveying valve into the vacuum existing within the separator 20.
Referring to FIGURE 4, one serious aspect of the leakage problem is that the pockets 33 fill with high pressure air as they line up with conduit 31, and further rotation of the rotor 32 carries these pockets of high pressure air upwardly for discharge into separator 20. The result is that each time a pocket 33 returns to near its top posi-tion, a puff of high pressure air is released into sepa-rator housing 20. These repeated bursts of high pressure air expand upwardly into the housing toward the center of : the vortex and carry with them some of the bulk material, foreign particles, and dust. Because these materials are thrown upwardly into the center of the vortex, some of them escape separation, and unless precautions are taken, are drawn into the blower or fan. It is the discovery of the present invention that this problem can be overcome by mounting within the housing 20, in the path of the air leaking into the housing, a baffle 50 to block the leakage air and the material carried thereby from directly enter-ing the center of the vortex near the air outlet means 26.
Bafle 50 effectively deflects upwardly thrown material and forces it outwardly into the swirling stream of mater-6~1 ial which surrounds the baffle. The larger particles anddust are thus re-entrained in the stream of material, while the leaka~e air is permitted to flow around the baffle into the center of the vortex to be withdrawn from the housin~ with the other air. The ver-tical posi-tioning of the baffle is not critical although in the preferred form of the invention it is shown to be located near a vertical midpoint of the lower portion 23. Further, the shape of the baffle is not critical and other shapes or configurations could be used so long as they perform the function of blocking foreign material from being dis-charged directly into the center of the vortex. '~he baffle could also have a conical top or conical bottom portion without departing from the invention.
Vented air locks are available which release the pressure to atmosphere ra-ther than transferring it into the housing, but they reduce the area at the inlet avail-able for filling the rotor and they are more expensive.
Further, even if a vented air lock is used, there is still some leakage around the rotor because of the high pressure drop across the conveying valve. With the present inven-tion, there is no need to use the more expensive vented air locks.
Although the present invention has its greatest utility in a system employing positive displacement blowers or pumps, it can also be used in prior art fan type systems to reduce the amount of material passing through the fan. The system employing the present inven-tion can be utilized to move any bulk flowable material _g_ 6 7 ~
including such exampl~s as grain, plastic pellets and fertilizer .
GRAIN EIAN~LIN& APPARATUS
WITH IMPROVED CYCLONE SEPARATOR
Technical Field This invention relates generally to apparatus for pneumatically moving or conveying bulk material. More specifically, a baffle is provided in the cyclone sepa-rator of a grain conveyor which utilizes a positive dis-placement blower, and in which separated grain is removed from the separator by a rotary airlock conveying valve, to block particles blown upwardly by air leaking through the airlock from entering the center of the cyclone, thus dra-matically improving separating performance and reducing blower damage and wear.
Summary of the Invention Prior art pneumatic grain conveyors have util-ized cyclone separators to permit the grain to comple-tely bypass the fan or blower. The suction created by the fan draws both air and grain carried thereby into the sepa-rator. the grain which is centrifugally separated is removed from the separator through an airlock system where the air bein~ discharged from the fan conveys the grain to a discharge point. Positive displacement blowers, as opposed to fans, have been used to obtain larger capacity with lower horsepower requirements. In addition, blowers are smallerl resulting in a more compact unit which is easier to handle, and less grain damage is caused because 6 ~ ~
a system employing a blower can use smaller lines. A
negative factor is that blowers can be damaged if larger particles are not separated from the air stream. Dust which is picked up also causes wear to the rotors. To overcome -this problem, prior art pneumatic grain movers with blowers have used large filters in the cyclone sepa-rator to remove dust and grain not previously separated.
Such filters are not only cumbersome and require periodic cleaning, but also increase the pressure drop and reduce airflow through -the system. However, such filters have been necessary in order to prevent damage to the rotors of positive displacement blowers, which rotate within a cylinder with very small internal clearances.
It is applicant's discovery that such cumbersome filter arrangements can be eliminated by utilizing a baffle mounted within the separator to block a substantial area between the grain discharge outlet at the bottom of the separator and the air outlet located at the center of the cyclone. Because there is a substantial pressure difference existing across the airlock, there is some leakage of air into the separator which carries grain and foreign material with it upwardly into the separator where the clean air is being removed at the center of the vor-tex. In the prior art systems, a certain amount of this forei~n material was re-entrained in the air stream and carried into the fan. Although it is preferable to use a small safety filter with the present invention, the baffle has eliminated the need for elaborate filter arrangements, thereby dramatically increasing the cyclone separator's performance, which both increases the efficiency of the 1 1~6~1 system and reduces the likelihood of damage to the blower.
The present invention has its greatest utility when used in a system employing a positive displacement blower, but it can also be used with prior art systems employing fans to substantially reduce the amount of material being carried through the fan.
The present invention is directed to pneumatic grain moving apparatus, comprising a cyclone separator com-prising a housing having a wall formed about a longitudinal axis, the housing having a conical lower portion with a grain discharge outlet at a bottom end thereof, an air inlet and an air outlet in the housing, a grain discharge conduit adjacent the grain discharge outlet, means including rotary airlock means mounted in the grain discharge outlet for transferring grain from the housing to the discharge conduit, means including a positive displacement blower and conduit means for drawing a flow of air through the air outlet to thereby lower the pressure within the housing and generate a flow of air through the air inlet and the cyclone separator to form a vortex in the housing to separate grain carried into the housing through the air inlet with the air, and for discharging air taken by the air outlet from the center of the vortex through the discharge conduit to carry therewith the grain in the discharge conduit, a safety filter mounted in the conduit means between the air outlet and the blower, and a baffle mounted centrally within and spaced from the wall of the lower conical portion to block a substantial area within the grain discharge outlet and the air outlet.
i~
1 ~7~67 ~
Higher pressure air leaking into the housing through the airlock means, and grain and foreign material carried upwardly thereby are blocked by the baffle and prevented from directly entering the center of the vortex in the area of the air outlet.
The baffle may be a centrally positioned, circular baffle mounted within the lower portion of the cyclone separator`housing. The positive displacement blower may be a blower which draws air from the air outlet conduit and discharges the air into the grain discharge conduit, whereby the high pressure air in the discharge conduit which is periodically released into the housing by the rotary airlock means blows upwardly into the housing carrying with it por-tions of the material and foreign matter carried thereby.
The pneumatic grain moving apparatus may be port-able. The safety filter may be a small safety filter, com-prising a heavy mesh Ccreen offering little resistance to air flow. The safety filter may comprise a cylindrical screen offering little resistance to flow, mounted coaxially within the conduit means. The baffle may be flat and may be mounted centrally within and spaced from the wall of the lower conical portion of the separator housing.
Brief Description of the Drawings FIGURE 1 is a schematic representation of a con-ventional prior art pneumatic grain-handling system.
FIGURE 2 is a similar view in side elevation of the pneumatic grain-handling system of the present invention, portions thereof being broken away.
-3a-``:j 1 1 7~67 i FIGURE 3 is a sectional view taken along line 3 3 of FIGURE 2.
FIGURE 4 is a schematic view in cross-section of a rotary airlock conveying valve of the type used in the present invention.
FIGURE 5 is a schematic cross-sectional view of a positive displacement pump or blower of the type used in the present invention.
Description of the Preferred Embodiment FIGURE 1 depicts a prior art grain-moving system employing a fan. The fan 10 rotates at a high speed to draw air from the centrifugal separator 11 through the con-duit 12 to in turn draw air through the conduit and flexible hose 13. Grain is drawn by the moving air into the conduit 13 and enters the separator 11 through a tangential inlet which creates a vortex within the separator. The resulting centrifugal force applied to the grain causes it to move to the outside of the separator --------housing and swirl downwardly by gravity to a r~tary air-lock Gonveying valve 14. The incoming air continually moves to the cen-ter of the vortex and is pulled out through conduit 12 by the fan, which discharges the air through the discharge condui-t 15. The conveying valve 14 transfers the grain from -the separator 11 into the dis-charge conduit 15 where it is picked up by the air from the fan and carried to -the discharge hopper 16. This system permits -the grain to be easily transferred or moved by air, but the grain bypasses the fan so that it is not damaged in the process. The prior art grain mover shown in FIGURE 1 is a portable unit and the fan and rotary conveying val~e would typically be driven from the power take-off of a tractor. The system shown in FIGURE 1 does not need a filter because the cyclone separator removes substantially all of the grain and foreign material from the air stream, but to the extent that some material does pass through the fan, the fan is not damaged thereby.
FIGURE 2 discloses in somewhat schematic form a preferred embodiment of the present invention. The cyclone separator 20 includes an elongated housing formed about a vertical, longitudinal axis 21, the housing having walls forming a generally cylindrical upper portion 22, a truncated conical lower portion 23 and a top end wall 24.
Upper portion 22 has a tangential inle-t 25 in the wall thereof, and top end wall 24 has an axial outlet conduit 26, the bottom end of which terminates near the center of the upper portion 22.
The bottom end of lower portion 23 is provided with a separated material outlet opening which connects to 7 ~.
a rotary airlock conveying valve 30. The conveying valve 30 is designed to transfer separated material from sepa-rator 20 into a discharge conduit 31 while at the same time maintaining the pressure difference between the interior of the separator 20 and the discharge conduit 31.
A positive displacement pump or blower 35 has its intake connected by a suitable conduit 36 to the axial air outlet 26. Blower 35 discharges into discharge con-duit 31 creating a high-pressure air flow therethrough to pick up the grain transferred into it by the conveying valve 30 for distribution to a remote location through a continuation of the discharge conduit which is not shown.
FIGURE 4 depicts in schematic form a cross-sec-tion of a typical conveying valve 30. The conveying valve 30 has a rotor 32 with a plurality of spaced, flat blades 32a which form a plurality of spaced pockets 33. The edges of the blades 32a engage the inner wall of the housing of the valve 30 to prevent the pressurized air in the discharge conduit 31 from flowing back through the valve into the separator housing 20. It can be seen that as the rotor 32 is rotated, grain from the lower portion 23 of the housing is picked up by the pockets 33 and transferred to the base of the unit which is connected with suitable adaptors on each end to the air discharge line 31. The high-pressure air flowing through the dis-charge conduit 31 thus empties the pockets 33 as they reach the base of the unit. Although not shown on the drawings, the rotor 32 is driven either by an electric motor mounted on the unit or from -the power take-off of a tractor through a suitable chain drive or transmission.
~ ~7~7~
FIGURE 5 discloses schematically the principle of operation of the pump or blower 35. The blower is of the positive displacement type and has two figure-eight rotors 37 and 38, mounted as shown, which rotate in oppo-site direc-tions to carry air from the inlet 39 to the outlet 40. Each of the rotors 37 and 38 rotate within a cylindrical portion of the housing and very small clear-ances are provided between the two rotors and betw~en the two rotors and the housing. The air discharged from the outlet 40 will be at relatively high pressure, which ex-tends throughout the discharge system. Blowers or pumps of this nature are pref~rable to fans because greater air flow can be achieved with less horsepower. However, because of the critical tolerances within the blower, the blower must be protected from foreign material. Grain or pieces of other bulk material being handled can cause damage to the blower and even dust particles will cause wear to the rotors and to the walls of the blower housing.
To prevent such material from entering the blower 35, a baffle 50 has been mounted within lower portion 23 to block a substantial area between the mater-ial outlet and the air outlet conduit 26. In the pre-ferred embodiment, baffle 50 is a circular plate which is rigidly mounted to the bottom end of the outlet conduit 26 by a plurality of support rods 51, 52. Baffle 50 is preferably circular and is centered on axis 21, perpen-dicular thereto. The edge of baffle 50 is spaced from the wall of lower portion 23 to permit separa-ted material to pass therebetween. Thus, a generally ring-shaped opening, free of obstruction, is provided between the baffle 50 and ~ `~ 7 6 ~
lower portion 23 through which the separated grain can swirl downwardly toward the airlock 30.
Although baffle 50 has been found to be highly effective in preventing extraneous material from entering the air outlet 26, a safety or emergency filter 55 is mounted within -the conduit 36. Conduit 36 includes as a portion thereof a plexiglas tube 36a which is connec-ted into the line by means of clamps 56 and 57 to permit visual inspection of the filter 55. Filter 55 is a cylin-drical screen or mesh structure mounted coaxially withinconduit 36, having a closed upper end and an open bottom end. A baffle (not shown) is provided at the bottom end of the filter 55 between it and the conduit 36 so that air is forced to pass through the walls of filter 55 and be discharged axially therefrom. Filter 55 is constructed of a relatively heavy-mesh screen so that it offers little resistance to air flow. It is strictly a safety or emer-gency filter because in the present invention, virtually no particles are left in the air stream drawn from sepa-rator 20.
Operation Blower 35 creates suction in conduit 36 to drawair from separator housing 20 through axial outlet 26.
The vacuum thus created draws air into the housing through tangential inlet 25, creating a vortex about the axis 21.
Bulk material being carried into the housing through tangential inlet 25 is caused to swirl about the interior of the housing and gradually moves downwardly in a swirl-ing pattern toward the bottom of lower portion 23. The vortex has a relatively clear center from which air is 7 :1L
drawn into outlet 26. ~he separated material is carried by conveying valve 30 into discharge conduit 31 which carries a flow of high pressure air from the outlet of blower 35. It should be noted that a substantial pressure difference exists between the interior of housing 20 and the interior of discharge conduit 31. As a result, there is a strong tendency for high pressure air within dis-charge conduit 31 to force its way through the conveying valve into the vacuum existing within the separator 20.
Referring to FIGURE 4, one serious aspect of the leakage problem is that the pockets 33 fill with high pressure air as they line up with conduit 31, and further rotation of the rotor 32 carries these pockets of high pressure air upwardly for discharge into separator 20. The result is that each time a pocket 33 returns to near its top posi-tion, a puff of high pressure air is released into sepa-rator housing 20. These repeated bursts of high pressure air expand upwardly into the housing toward the center of : the vortex and carry with them some of the bulk material, foreign particles, and dust. Because these materials are thrown upwardly into the center of the vortex, some of them escape separation, and unless precautions are taken, are drawn into the blower or fan. It is the discovery of the present invention that this problem can be overcome by mounting within the housing 20, in the path of the air leaking into the housing, a baffle 50 to block the leakage air and the material carried thereby from directly enter-ing the center of the vortex near the air outlet means 26.
Bafle 50 effectively deflects upwardly thrown material and forces it outwardly into the swirling stream of mater-6~1 ial which surrounds the baffle. The larger particles anddust are thus re-entrained in the stream of material, while the leaka~e air is permitted to flow around the baffle into the center of the vortex to be withdrawn from the housin~ with the other air. The ver-tical posi-tioning of the baffle is not critical although in the preferred form of the invention it is shown to be located near a vertical midpoint of the lower portion 23. Further, the shape of the baffle is not critical and other shapes or configurations could be used so long as they perform the function of blocking foreign material from being dis-charged directly into the center of the vortex. '~he baffle could also have a conical top or conical bottom portion without departing from the invention.
Vented air locks are available which release the pressure to atmosphere ra-ther than transferring it into the housing, but they reduce the area at the inlet avail-able for filling the rotor and they are more expensive.
Further, even if a vented air lock is used, there is still some leakage around the rotor because of the high pressure drop across the conveying valve. With the present inven-tion, there is no need to use the more expensive vented air locks.
Although the present invention has its greatest utility in a system employing positive displacement blowers or pumps, it can also be used in prior art fan type systems to reduce the amount of material passing through the fan. The system employing the present inven-tion can be utilized to move any bulk flowable material _g_ 6 7 ~
including such exampl~s as grain, plastic pellets and fertilizer .
Claims (5)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Pneumatic apparatus for conveying grain, comprising:
a cyclone separator comprising a housing formed about a longitudinal axis, said housing having walls forming a generally cylindrical upper portion with a tangential inlet and a top end wall, and a truncated conical lower portion with a separated material outlet at a bottom end thereof;
an air outlet conduit in said top end wall;
a material discharge conduit adjacent said material outlet;
means including a rotary airlock conveying valve mounted in said material outlet for transferring separated material from said housing to said discharge conduit;
means including blower means and conduit means for drawing a flow of air through said air outlet conduit to thereby lower the pressure within said housing and generate a flow of air through said tangential inlet and said cyclone separator to form a vortex in said housing to separate material carried into said housing through said tangential inlet with said air, and for discharging air taken by said air outlet conduit from the center of said vortex through said discharge conduit to carry therewith the separated material in the discharge conduits - Page one of Claims -said blower means being a positive displacement blower which draws air from said air outlet conduit and discharges said air into said material discharge con-duit, whereby the high pressure air in said discharge conduit which is periodically released into said housing by said rotary airlock conveying valve blows upwardly into said housing carrying with it portions of said material and foreign matter carried thereby; and a centrally positioned, circular baffle mounted within said lower portion spaced from said wall of said housing to block a substantial area between said material outlet and said air outlet conduit; and a safety filter mounted in said conduit means leading to said blower;
whereby high pressure air entering said housing through said rotary airlock conveying valve, and material carried upwardly thereby, are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet conduit.
a cyclone separator comprising a housing formed about a longitudinal axis, said housing having walls forming a generally cylindrical upper portion with a tangential inlet and a top end wall, and a truncated conical lower portion with a separated material outlet at a bottom end thereof;
an air outlet conduit in said top end wall;
a material discharge conduit adjacent said material outlet;
means including a rotary airlock conveying valve mounted in said material outlet for transferring separated material from said housing to said discharge conduit;
means including blower means and conduit means for drawing a flow of air through said air outlet conduit to thereby lower the pressure within said housing and generate a flow of air through said tangential inlet and said cyclone separator to form a vortex in said housing to separate material carried into said housing through said tangential inlet with said air, and for discharging air taken by said air outlet conduit from the center of said vortex through said discharge conduit to carry therewith the separated material in the discharge conduits - Page one of Claims -said blower means being a positive displacement blower which draws air from said air outlet conduit and discharges said air into said material discharge con-duit, whereby the high pressure air in said discharge conduit which is periodically released into said housing by said rotary airlock conveying valve blows upwardly into said housing carrying with it portions of said material and foreign matter carried thereby; and a centrally positioned, circular baffle mounted within said lower portion spaced from said wall of said housing to block a substantial area between said material outlet and said air outlet conduit; and a safety filter mounted in said conduit means leading to said blower;
whereby high pressure air entering said housing through said rotary airlock conveying valve, and material carried upwardly thereby, are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet conduit.
2. Pneumatic grain moving apparatus, comprising:
a cyclone separator comprising a housing having a wall formed about a longitudinal axis, said housing having a conical lower portion with a grain discharge outlet at a bottom end thereof;
an air inlet and an air outlet in said housing;
a grain discharge conduit adjacent said grain discharge outlet;
means including rotary airlock means mounted in said grain discharge outlet for transferring grain from said housing to said discharge conduit;
- Page two of Claims -means including a positive displacement blower and conduit means for drawing a flow of air thorugh said air outlet to thereby lower the pressure within said housing and generate a flow of air through said air inlet and said cyclone separator to form a vortex in said housing to separate grain carried into said housing through said air inlet with said air, and for discharging air taken by said air outlet from the center of said vortex through said discharge conduit to carry therewith the grain in the discharge conduit;
a safety filter mounted in said conduit means be-tween said air outlet and said blower; and a baffle mounted centrally within and spaced from said wall of said lower conical portion to block a substantial area between said grain discharge outlet and said air outlet;
whereby higher pressure air leaking into said housing through said airlock means, and grain and foreign material carried upwardly thereby are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet.
a cyclone separator comprising a housing having a wall formed about a longitudinal axis, said housing having a conical lower portion with a grain discharge outlet at a bottom end thereof;
an air inlet and an air outlet in said housing;
a grain discharge conduit adjacent said grain discharge outlet;
means including rotary airlock means mounted in said grain discharge outlet for transferring grain from said housing to said discharge conduit;
- Page two of Claims -means including a positive displacement blower and conduit means for drawing a flow of air thorugh said air outlet to thereby lower the pressure within said housing and generate a flow of air through said air inlet and said cyclone separator to form a vortex in said housing to separate grain carried into said housing through said air inlet with said air, and for discharging air taken by said air outlet from the center of said vortex through said discharge conduit to carry therewith the grain in the discharge conduit;
a safety filter mounted in said conduit means be-tween said air outlet and said blower; and a baffle mounted centrally within and spaced from said wall of said lower conical portion to block a substantial area between said grain discharge outlet and said air outlet;
whereby higher pressure air leaking into said housing through said airlock means, and grain and foreign material carried upwardly thereby are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet.
3. Portable pneumatic grain moving apparatus, comprising:
a cyclone separator comprising a housing having a wall formed about a longitudinal axis, said housing having a conical lower portion with a grain discharge outlet at a bottom end thereof;
an air inlet and an air outlet in said housing;
a grain discharge conduit adjacent said grain discharge outlet;
means including rotary airlock means mounted in said grain discharge outlet for transferring grain from said housing to said discharge conduit;
- Page three of Claims -means including a positive displacement blower and conduit means for drawing a flow of air through said air outlet to thereby lower the pressure within said housing and generate a flow of air through said air inlet and said cyclone separator to form a vortex in said housing to separate grain carried into said housing through said air inlet with said air, and for discharging air taken by said air outlet from the center of said vortex through said discharge conduit to carry therewith the grain in the discharge conduit;
a small safety filter, comprising a heavy mesh screen offering little resistance to air flow, mounted in said conduit means between said air outlet and said blower; and a baffle mounted within and spaced from said wall of said lower conical portion to block a substan-tial area between said grain discharge outlet and said air outlet;
whereby higher pressure air leaking into said housing through said airlock means, and grain and foreign material carried upwardly thereby, are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet.
a cyclone separator comprising a housing having a wall formed about a longitudinal axis, said housing having a conical lower portion with a grain discharge outlet at a bottom end thereof;
an air inlet and an air outlet in said housing;
a grain discharge conduit adjacent said grain discharge outlet;
means including rotary airlock means mounted in said grain discharge outlet for transferring grain from said housing to said discharge conduit;
- Page three of Claims -means including a positive displacement blower and conduit means for drawing a flow of air through said air outlet to thereby lower the pressure within said housing and generate a flow of air through said air inlet and said cyclone separator to form a vortex in said housing to separate grain carried into said housing through said air inlet with said air, and for discharging air taken by said air outlet from the center of said vortex through said discharge conduit to carry therewith the grain in the discharge conduit;
a small safety filter, comprising a heavy mesh screen offering little resistance to air flow, mounted in said conduit means between said air outlet and said blower; and a baffle mounted within and spaced from said wall of said lower conical portion to block a substan-tial area between said grain discharge outlet and said air outlet;
whereby higher pressure air leaking into said housing through said airlock means, and grain and foreign material carried upwardly thereby, are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet.
4. Pneumatic apparatus for conveying grain, comprising:
a cyclone separator comprising a housing formed about a longitudinal axis, said housing having walls forming a generally cylindrical upper portion with a tangential inlet and a top end wall, and a truncated conical lower portion with a separated material outlet at a bottom end thereof;
- Page four of Claims -an air outlet conduit in said top end wall;
a material discharge conduit adjacent said material outlet;
means including a rotary airlock conveying valve mounted in said material outlet for transferring separated material from said housing to said discharge conduit;
means including blower means and conduit means for drawing a flow of air through said air outlet conduit to thereby lower the pressure within said housing and generate a flow of air through said tangential inlet and said cyclone separator to form a vortex in said housing to separate material carried into said housing through said tangential inlet with said air, and for discharging air taken by said air outlet conduit from the center of said vortex through said discharge conduit to carry therewith the separated material in the discharge conduit;
said blower means being a positive displacement blower which draws air from said air outlet conduit and discharges said air into said material discharge con-duit, whereby the high pressure air in said discharge conduit which is periodically released into said housing by said rotary airlock conveying valve blows upwardly into said housing carrying with it portions of said material and foreign matter carried thereby;
a centrally positioned, flat circular baffle mounted within said lower portion spaced from said wall of said housing to block a substantial area between said - Page five of claims -material outlet and said air outlet conduit; and a safety filter mounted in said conduit means leading to said blower, comprising a cylindrical mesh structure mounted coaxially within said conduit means, having a closed upper end and an open bottom end, and means be-tween said bottom end and said conduit means for directing air flow through said mesh structure for discharge axially therefrom;
whereby higher pressure air entering said housing through said rotary airlock conveying valve, and material carried upwardly thereby, are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet conduit.
a cyclone separator comprising a housing formed about a longitudinal axis, said housing having walls forming a generally cylindrical upper portion with a tangential inlet and a top end wall, and a truncated conical lower portion with a separated material outlet at a bottom end thereof;
- Page four of Claims -an air outlet conduit in said top end wall;
a material discharge conduit adjacent said material outlet;
means including a rotary airlock conveying valve mounted in said material outlet for transferring separated material from said housing to said discharge conduit;
means including blower means and conduit means for drawing a flow of air through said air outlet conduit to thereby lower the pressure within said housing and generate a flow of air through said tangential inlet and said cyclone separator to form a vortex in said housing to separate material carried into said housing through said tangential inlet with said air, and for discharging air taken by said air outlet conduit from the center of said vortex through said discharge conduit to carry therewith the separated material in the discharge conduit;
said blower means being a positive displacement blower which draws air from said air outlet conduit and discharges said air into said material discharge con-duit, whereby the high pressure air in said discharge conduit which is periodically released into said housing by said rotary airlock conveying valve blows upwardly into said housing carrying with it portions of said material and foreign matter carried thereby;
a centrally positioned, flat circular baffle mounted within said lower portion spaced from said wall of said housing to block a substantial area between said - Page five of claims -material outlet and said air outlet conduit; and a safety filter mounted in said conduit means leading to said blower, comprising a cylindrical mesh structure mounted coaxially within said conduit means, having a closed upper end and an open bottom end, and means be-tween said bottom end and said conduit means for directing air flow through said mesh structure for discharge axially therefrom;
whereby higher pressure air entering said housing through said rotary airlock conveying valve, and material carried upwardly thereby, are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet conduit.
5. Portable pneumatic grain moving apparatus, comprising:
a cyclone separator comprising a housing having a wall formed about a longitudinal axis, said housing having a conical lower portion with a grain discharge outlet at a bottom end thereof;
an air inlet and an air outlet in said housing;
a grain discharge conduit adjacent said grain discharge outlet;
means including rotary airlock means mounted in said grain discharge outlet for transferring grain from said housing to said discharge conduit;
means including a positive displacement blower and conduit means for drawing a flow of air through said air outlet to thereby lower the pressure within said housing and generate a flow of air through said air inlet and said cyclone separator to form a vortex in said housing to separate grain carried into said housing through said - Page six of Claims -air inlet with said air, and for discharging air taken by said air outlet from the center of said vortex through said discharge conduit to carry therewith the grain in the discharge conduit;
a safety filter mounted in said conduit means be-tween said air outlet and said blower, comprising a cylindrical screen offering little resistance to flow mounted coaxially within said conduit means, having a closed end and an open end, and means between said safety filter and said conduit means for directing air flow through said screen and said open end; and a flat baffle mounted centrally within and spaced from said wall of said lower conical portion to block a substantial area between said grain discharge outlet and said air outlet;
whereby higher pressure air leaking into said housing through said airlock means, and grain and foreign material carried upwardly thereby, are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet.
- Page seven of Claims -
a cyclone separator comprising a housing having a wall formed about a longitudinal axis, said housing having a conical lower portion with a grain discharge outlet at a bottom end thereof;
an air inlet and an air outlet in said housing;
a grain discharge conduit adjacent said grain discharge outlet;
means including rotary airlock means mounted in said grain discharge outlet for transferring grain from said housing to said discharge conduit;
means including a positive displacement blower and conduit means for drawing a flow of air through said air outlet to thereby lower the pressure within said housing and generate a flow of air through said air inlet and said cyclone separator to form a vortex in said housing to separate grain carried into said housing through said - Page six of Claims -air inlet with said air, and for discharging air taken by said air outlet from the center of said vortex through said discharge conduit to carry therewith the grain in the discharge conduit;
a safety filter mounted in said conduit means be-tween said air outlet and said blower, comprising a cylindrical screen offering little resistance to flow mounted coaxially within said conduit means, having a closed end and an open end, and means between said safety filter and said conduit means for directing air flow through said screen and said open end; and a flat baffle mounted centrally within and spaced from said wall of said lower conical portion to block a substantial area between said grain discharge outlet and said air outlet;
whereby higher pressure air leaking into said housing through said airlock means, and grain and foreign material carried upwardly thereby, are blocked by said baffle and prevented from directly entering the center of said vortex in the area of the air outlet.
- Page seven of Claims -
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17386480A | 1980-07-30 | 1980-07-30 | |
| US173,864 | 1980-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1176671A true CA1176671A (en) | 1984-10-23 |
Family
ID=22633841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000382769A Expired CA1176671A (en) | 1980-07-30 | 1981-07-29 | Grain handling apparatus with improved cyclone separator |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0057690A1 (en) |
| CA (1) | CA1176671A (en) |
| WO (1) | WO1982000451A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107826766A (en) * | 2017-10-30 | 2018-03-23 | 桐城市天泰农机服务专业合作社 | A kind of hand propelled grain adsorbs storaging machine for barn |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572726A (en) * | 1983-07-25 | 1986-02-25 | Vana Industries Ltd. | Cyclone separator |
| US4630975A (en) * | 1983-10-11 | 1986-12-23 | Becker John H | Air encasement system for transportation of particulates |
| US4580928A (en) * | 1984-01-18 | 1986-04-08 | Vana Industries Ltd. | Outlet duct for a pneumatic conveyor |
| US5163786A (en) * | 1987-08-12 | 1992-11-17 | Christianson Systems, Inc. | Cyclone separator with filter assembly for pneumatic conveyor |
| US5678959A (en) * | 1995-09-29 | 1997-10-21 | Mississippi Lime Company | Method of, and apparatus for, reducing scaling in pneumatic lime conveying systems |
| US6036407A (en) * | 1997-09-03 | 2000-03-14 | Exxon Chemical Patents Inc. | Solids conveying system for compacted, friable solids that can not be pushed or compressed |
| US6368028B1 (en) | 1997-09-03 | 2002-04-09 | Exxonmobil Chemical Patents Inc. | Conveying systems for compacted, friable solids |
| FR2776642B1 (en) * | 1998-03-27 | 2000-06-02 | Toy | PLANT FOR THE PREPARATION AND DISTRIBUTION OF POWDERY MATERIALS |
| EP0972573A1 (en) * | 1998-07-15 | 2000-01-19 | Human net Kabushiki-Kaisya | Cyclone separator and strainer for the same |
| US6129775A (en) * | 1998-08-19 | 2000-10-10 | G.B.D. Corp. | Terminal insert for a cyclone separator |
| US6312594B1 (en) * | 1998-08-19 | 2001-11-06 | G.B.D. Corp. | Insert for a cyclone separator |
| US6168716B1 (en) | 1998-08-19 | 2001-01-02 | G.B.D. Corp. | Cyclone separator having a variable transverse profile |
| US6277278B1 (en) | 1998-08-19 | 2001-08-21 | G.B.D. Corp. | Cyclone separator having a variable longitudinal profile |
| WO2000017079A1 (en) * | 1998-09-23 | 2000-03-30 | Exxon Chemical Patents Inc. | Pneumatic conveying system for compacted, friable solids |
| ITMI20100165A1 (en) * | 2010-02-04 | 2011-08-05 | Edilkamin S P A | POWER SUPPLY, PARTICULARLY FOR LOADING PELLETS IN THE TANK OF A HEATING EQUIPMENT AS A STOVE, FIREPLACE, AND SIMILAR |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1031862A (en) * | 1907-09-30 | 1912-07-09 | Orville M Morse | Dust collector or separator. |
| GB191007552A (en) * | 1910-03-26 | 1910-09-08 | Robert Parkinson | Improvements in Pneumatic Conveyors. |
| US1723703A (en) * | 1927-05-24 | 1929-08-06 | George E Olmsted | Dust separator and collector |
| US1811597A (en) * | 1929-12-28 | 1931-06-23 | Steinbart Alfred | Apparatus for cleaning gases |
| US2230425A (en) * | 1939-05-17 | 1941-02-04 | Loretta W Macaulay | Portable pneumatic grain elevator |
| US2849079A (en) * | 1957-01-25 | 1958-08-26 | Shell Dev | Cyclone with drained plate |
| US2946626A (en) * | 1957-05-31 | 1960-07-26 | Atkinson Bulk Transp Company | Suction-pressure unloading system |
| US3077365A (en) * | 1959-01-22 | 1963-02-12 | Sprout Waldron & Co Inc | Pneumatic conveying system |
| US3684093A (en) * | 1969-08-13 | 1972-08-15 | Ashizawa Iron Works Co Ltd | Method and apparatus for separating particles from particle-laden fluid |
| JPS5410598Y2 (en) * | 1974-10-31 | 1979-05-16 |
-
1981
- 1981-07-27 WO PCT/US1981/001006 patent/WO1982000451A1/en unknown
- 1981-07-27 EP EP19810902181 patent/EP0057690A1/en not_active Withdrawn
- 1981-07-29 CA CA000382769A patent/CA1176671A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107826766A (en) * | 2017-10-30 | 2018-03-23 | 桐城市天泰农机服务专业合作社 | A kind of hand propelled grain adsorbs storaging machine for barn |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1982000451A1 (en) | 1982-02-18 |
| EP0057690A1 (en) | 1982-08-18 |
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