CA1053897A - Method and apparatus for spraying agglomerating powders - Google Patents
Method and apparatus for spraying agglomerating powdersInfo
- Publication number
- CA1053897A CA1053897A CA227,759A CA227759A CA1053897A CA 1053897 A CA1053897 A CA 1053897A CA 227759 A CA227759 A CA 227759A CA 1053897 A CA1053897 A CA 1053897A
- Authority
- CA
- Canada
- Prior art keywords
- powder
- powder chamber
- opening
- delivery tube
- reservoir
- 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
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1404—Arrangements for supplying particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
- B05B15/52—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1404—Arrangements for supplying particulate material
- B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1481—Spray pistols or apparatus for discharging particulate material
- B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
- B21C51/005—Marking devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nozzles (AREA)
- Coating Apparatus (AREA)
Abstract
SPECIFICATION
MICHAEL L MESTER and FRANK L. WHITEMAN
METHOD AND APPARATUS FOR
SPRAYING AGGLOMERATING POWDERS
ABSTRACT OF THE DISCLOSURE
An apparatus for pneumatically spraying dry powders through a delivery tube from a fluidized powder reservoir having a bed powder chamber housing within said reservoir to provide an elongated chamber communicating with the delivery tube. The housing has an opening through a wall thereof, a sliding gate valve to selectively close said opening, and a wiping means on said valve to wipe the edges of the opening whenever the valve is activated.
Means are provided for blowing a low-velocity purging gas through the powder chamber and delivery tube when the opening through the wall of the powder chamber is closed, and a high-velocity spraying gas when the opening is open to admit fluidized powders.
MICHAEL L MESTER and FRANK L. WHITEMAN
METHOD AND APPARATUS FOR
SPRAYING AGGLOMERATING POWDERS
ABSTRACT OF THE DISCLOSURE
An apparatus for pneumatically spraying dry powders through a delivery tube from a fluidized powder reservoir having a bed powder chamber housing within said reservoir to provide an elongated chamber communicating with the delivery tube. The housing has an opening through a wall thereof, a sliding gate valve to selectively close said opening, and a wiping means on said valve to wipe the edges of the opening whenever the valve is activated.
Means are provided for blowing a low-velocity purging gas through the powder chamber and delivery tube when the opening through the wall of the powder chamber is closed, and a high-velocity spraying gas when the opening is open to admit fluidized powders.
Description
'f~
~053~97 ,,_ .......
i BACKGROUND OF THE INVENTION
Il Durlng various steel ~inishing processes wherein a steel l¦is shaped or ~ormed while the steel is in a heated condition, there ¦are associated operations wherein it is desirable to mark the hot ~steel, ~or example, identi~ication markings, locating de~ects, etc~
Since the steel is hot, ordinary marking materials such as paint ,Icannot be used as these would quickly burn o~f. Hence, the practice ¦¦has been to apply dry powder pigments or metallic-powders onto the ¦¦hot steel sur~ace, pre~erably by pneumatically spraying such powders;.
Il . I .
I~ .
-! ~ . , , ~ .';
'`` ~053897 Although there is a selection of commercially available equipment for spraying dry powders, such prior art equipment has not been suitable for spraying the types of powders used to mark hot steel. That is to say, the powders most commonly preferred for marking hot steel, e.g. titanium dioxide, zinc oxide, etc., tend to agglomerate when pneumatically pumped, and thus frequently plug and clog the powder spraying equipment. Even the use of tetrafluoro-ethylene linings, extra-dry air, and free-flowing additives such as silicon dioxide do not completely obviate the clogging problem.
SU~RY OF THE INVENTION
This invention is predicated upon our development of an apparatus for spraying dry powders which tend to agglomerate and is characterized by non-clogging and self-cleaning features.
Accordingly, an object of this invention is to provide an apparatus for spraying dry powders.
Another object of this invention is to provide an apparatus for spraying dry powders which is characterized by non-clogging and self-cleaning features and hence is ideally suited for spraying dry powders which tend to agglomerate and clog conventional spraying devices.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is an elevation view in partial section showing an apparatus for spraying dry powder in accordance with one embodiment of this invention.
Figure 2 is a plan view of the apparatus shown in Figure 1.
Figure 3 is an elevation view of a powder chamber incorpor-
~053~97 ,,_ .......
i BACKGROUND OF THE INVENTION
Il Durlng various steel ~inishing processes wherein a steel l¦is shaped or ~ormed while the steel is in a heated condition, there ¦are associated operations wherein it is desirable to mark the hot ~steel, ~or example, identi~ication markings, locating de~ects, etc~
Since the steel is hot, ordinary marking materials such as paint ,Icannot be used as these would quickly burn o~f. Hence, the practice ¦¦has been to apply dry powder pigments or metallic-powders onto the ¦¦hot steel sur~ace, pre~erably by pneumatically spraying such powders;.
Il . I .
I~ .
-! ~ . , , ~ .';
'`` ~053897 Although there is a selection of commercially available equipment for spraying dry powders, such prior art equipment has not been suitable for spraying the types of powders used to mark hot steel. That is to say, the powders most commonly preferred for marking hot steel, e.g. titanium dioxide, zinc oxide, etc., tend to agglomerate when pneumatically pumped, and thus frequently plug and clog the powder spraying equipment. Even the use of tetrafluoro-ethylene linings, extra-dry air, and free-flowing additives such as silicon dioxide do not completely obviate the clogging problem.
SU~RY OF THE INVENTION
This invention is predicated upon our development of an apparatus for spraying dry powders which tend to agglomerate and is characterized by non-clogging and self-cleaning features.
Accordingly, an object of this invention is to provide an apparatus for spraying dry powders.
Another object of this invention is to provide an apparatus for spraying dry powders which is characterized by non-clogging and self-cleaning features and hence is ideally suited for spraying dry powders which tend to agglomerate and clog conventional spraying devices.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is an elevation view in partial section showing an apparatus for spraying dry powder in accordance with one embodiment of this invention.
Figure 2 is a plan view of the apparatus shown in Figure 1.
Figure 3 is an elevation view of a powder chamber incorpor-
- 2 - Mester et al . - . - . ., : , ~ . ., ., .. .. , :, . , : : . .. .. . .... . .
~ 53~3~7 ating another embodiment of this invention.
Figure 4 is a plan view of the powder chamber shown in Figure 3.
Figure 5 is a schematic diagram of the pneumatic control circuit for operating the apparatus shown in the other figures.
DESCRIPTION OF T~E PREFERRED EMBODIMENTS
With reference to Figures 1 and 2, one embodiment of this invention comprises a fluidized bed powder reservoir 10, a powder chamber 12 and an air cylinder 14. The fluidized bed powder reser-voir 10 is of the type well known in the art and is commercially available (e.g. Ransburg Electro-Coating Corporation, Model No.
13893). The powder chamber 12 is basically a tubular type structure having a horizontal opening therethrough, and is attached to an in-side wall of reservoir 10. As shown, powder chamber 12 is held against face plate 16 by nozzle adapter 18-and collar 20, and face pla~e 16 is held against the wall of reservoir 10 by nuts and bolts 22. Nozzle adapter 18 may be locked in position by roll pin 24.
Delivery tube 25, through which the powder is sprayed, is attached to the outside end of nozzle adapter 18. ~ `
The powder chamber 12 has an elongated opening 26 through the upper side thereof to permit passage of fluidized powders from reservoir 10 in through the elongated opening through powder chamber 12. Sliding gate 28, a sleeve-like member closely encircling powder chamber 12, is provided to selectively expose and cover opening 26, thereby opening and closing powder chamber 12 to selectively admit fluidized powder thereinto. A wiper 30, consisting of a bolt or other such object, is attached to sliding gate 28 such that a lower _ 3 _ Mester et al , ' ` ' .: , , ~
, , - . ~ ~ .:~ - .
~ 1~53~97 extension thereof extends downward through opening 26 so that the edges of opening 26 are wiped clear of most powder adhering thereto whenever sliding gate 28 is activated to either the open or closed ,~
position. If necessary, an elongated plunger rod 32 is attached to the lower end of wiper 30 and extends horizontally to the opening in nozzle adapter 18 to loosen any agglomerated powder in the nozzle adapter 18 when sliding gate 28 is activated to the open position.
Sliding gate 28 is activated to the open and closed posi-tion by reciprocating air cylinder 14 attached to an outside wall of reservoir 10, opposite powder chamber 12, by bracket 38 and nuts and bolts, 40. Roll pin 42 anchors one end of air cylinder 14 to bracket 38 while stroke rod 44, extending from the other end is threaded into clevis 46, and there locked with locknut 48. Push rod 50 is attached to clevis 46 by pin 52 and extends through the wall of reservoir 10, -with the inside end thereof secured to sliding gate 12, by screws 54 tFiY. 2). Grommet 56 seals the opening in reservoir 10 through which push rod 50 passes. Spring 58 and washers 60 hold grommet 56 firmly against this opening.
U-tube 62 is provided inside reservoir 10 to admit com-pressed air or gas to the inside end of powder chamber 12. One endof U-tube 62 is attached to face plate 16 by bulkhead connector 64, while the other end is connected to powder chamber 12 by connector 65.
In operation, gate valve 28 is activated to the closed position, and the powders to be sprayed through delivery tube 25 are placed into reservoir 10 and fluidized in a conventional manner, i.e.
by air passing through a porous membrane. Thereafter, purging air or - 4 - Mester et al ~S3897 other gas is admitted at low velocity to U-tube 62 at connector 6~.
This low-velocity purging air flows through U-tube 62, powder cham-ber 12 and out of the apparatus through delivery tube 25. The apparatus is thus activated and ready to spray powder on demand. To spray powder, the velocity of the air admitted at U-tube 62 is in-creased as gate valve 28 is opened by air cylinder 14 to admit fluidized powder to powder chamber 12. Thus admitted, the powder is pneumatically ejected through nozzle adapter 18 and delivery pipe 25.
When it is desired that powder spraying be discontinued, air cylinder 14 is activated to close gate valve 28 as the air admitted to the powder chamber 12 is reduced back to a low-velocity purging blow.
Each time gate valve 28 is opened or closed, wiper 30 wipes the edges of opening 26 to remove any agglomerated powder which may have formed thereon. In addition, the low-velocity purging blow maintained through powder chamber 12, nozzle adapter 18 and delivery tube 25 will keep this passageway clear of accumulated powders.
Figures 3 and 4 illustrate a different embodiment of this invention wherein a modified p~wder chamber and gate valve are pro-vided. With reference to Figures 3 and 4, this embodiment comprises a powder chamber 112 having rectangular openings 126 in the upper and lower surfaces thereof. A gate valve 128 to close these openings is provided by inserting a tight fitting slidable sleeve within powder chamber 112. A wiper 130 to wipe the edges of opening 126 is pro-vided by a pair of rectangular flanges on the forward edge of the gate valve 128 which extend through opening 126. In this embodiment, U-tube 162 must be flexible as it is connected to pipe T-coupling 166 which is in turn secured between gate valve 128 and push rod 150.
- 5 - Mester et al : , . . .
, . ~ ~ . -~053897 To open gate valve 128, an air cylinder (no-t shown~ is activated to pull push rod 150 to the left. This pulls T-coupling 166 and gate valve 128 to the left as well as wipers 130 thus exposing the inside of powder chamber 112 to the fluid~zed powders. In all other re-spects, this embodiment is substantially the same as the first described embodiment.
Reference to Figure 5 will illustrate the pneumatic control circuit used to operate the first described embodiment. With refer-ence to Figure 5, compressed air is admitted through valve 70, air and oil filter 72, and filter/dryer 74. From filter/dryer 74, the compressed air follows three lines, one line 76 to activate the fluidized powder reservoir 10, where valve 78 admits air to needle valve 80. Low velocity air flows continuously through needle valve 82 and line 84 to provide the low velocity purging blow through pow- -der chamber 12 and delivery tube 25. A four-way solenoid air valve 86, operated by switch 88 is provided to activate the powder spraying mechanism. When powder is not being sprayed, switch 88 is open and no air is being admitted through valve 86. At this point, only the low velocity purging air is being blown through powder chamber 12, and gate valve 28 thereon is in the closed position so that fluidized powder is not admitted thereto. To commence blowing powder, switch 88 is closed to open valve 86 allowing high velocity air to flow through adjustable air regulator and filter 90 via line 92. From regulator and filter 90, line 93 delivers the high-velocity air to air cylinder 14 to thereby open gate valve 28 and admit ~luidized powder to chamber 14, while line 94 delivers high-velocity air to U-tube 62 and accordingly powder chamber 12 and thus blows the powder therein - 6 - Mester et al , ". . , .: , ' ' ', ;: ' .. ' . ' ,;
' ,, -' ',~ " .` ~- ',,, ' ' ' , .
` -; ' ' " '' . . '' ' ', . . .' through delivery tube 25. When i-t is desired to stop spraying pow-der, switch 88 is reopened which directs the high-velocity air through line 96, and adjustable air regulator and filter 98 to the other end of air cylinder 14 thereby reversing its position to close gate valve 28, while at the same time, the air admitted through line 92 is discontinued. With gate valve 28 closed, only the low-velocity purging air is admitted through powder chamber 14 and delivery tube 25.
In development work testing the above described apparatus, no critical limits were noted with respect to air pressure and flow rates. In order to present a clearer understanding of its operation however, it is noted that the apparatus was operated quite success-fully with source air pressures of 80 to lO0 psi, with purging air blow rates of 35 to 45 CFM, and spraying air blow rates of 80 to 90 CFM. In these tests the delivery tube 25 had an inside diameter of 5 8-inch, with a calculated outlet pressure of about 40 psi.
It is also to be noted that, although a gate valve has been specifically disclosed it is conceivable that any other type of valve could be used which could periodically block the opening through the powder chamber and be self cleaning. Such valve can also be operated by any well known valve operating mechanism.
- 7 - Mester et al .... . . . . . .
.
~ 53~3~7 ating another embodiment of this invention.
Figure 4 is a plan view of the powder chamber shown in Figure 3.
Figure 5 is a schematic diagram of the pneumatic control circuit for operating the apparatus shown in the other figures.
DESCRIPTION OF T~E PREFERRED EMBODIMENTS
With reference to Figures 1 and 2, one embodiment of this invention comprises a fluidized bed powder reservoir 10, a powder chamber 12 and an air cylinder 14. The fluidized bed powder reser-voir 10 is of the type well known in the art and is commercially available (e.g. Ransburg Electro-Coating Corporation, Model No.
13893). The powder chamber 12 is basically a tubular type structure having a horizontal opening therethrough, and is attached to an in-side wall of reservoir 10. As shown, powder chamber 12 is held against face plate 16 by nozzle adapter 18-and collar 20, and face pla~e 16 is held against the wall of reservoir 10 by nuts and bolts 22. Nozzle adapter 18 may be locked in position by roll pin 24.
Delivery tube 25, through which the powder is sprayed, is attached to the outside end of nozzle adapter 18. ~ `
The powder chamber 12 has an elongated opening 26 through the upper side thereof to permit passage of fluidized powders from reservoir 10 in through the elongated opening through powder chamber 12. Sliding gate 28, a sleeve-like member closely encircling powder chamber 12, is provided to selectively expose and cover opening 26, thereby opening and closing powder chamber 12 to selectively admit fluidized powder thereinto. A wiper 30, consisting of a bolt or other such object, is attached to sliding gate 28 such that a lower _ 3 _ Mester et al , ' ` ' .: , , ~
, , - . ~ ~ .:~ - .
~ 1~53~97 extension thereof extends downward through opening 26 so that the edges of opening 26 are wiped clear of most powder adhering thereto whenever sliding gate 28 is activated to either the open or closed ,~
position. If necessary, an elongated plunger rod 32 is attached to the lower end of wiper 30 and extends horizontally to the opening in nozzle adapter 18 to loosen any agglomerated powder in the nozzle adapter 18 when sliding gate 28 is activated to the open position.
Sliding gate 28 is activated to the open and closed posi-tion by reciprocating air cylinder 14 attached to an outside wall of reservoir 10, opposite powder chamber 12, by bracket 38 and nuts and bolts, 40. Roll pin 42 anchors one end of air cylinder 14 to bracket 38 while stroke rod 44, extending from the other end is threaded into clevis 46, and there locked with locknut 48. Push rod 50 is attached to clevis 46 by pin 52 and extends through the wall of reservoir 10, -with the inside end thereof secured to sliding gate 12, by screws 54 tFiY. 2). Grommet 56 seals the opening in reservoir 10 through which push rod 50 passes. Spring 58 and washers 60 hold grommet 56 firmly against this opening.
U-tube 62 is provided inside reservoir 10 to admit com-pressed air or gas to the inside end of powder chamber 12. One endof U-tube 62 is attached to face plate 16 by bulkhead connector 64, while the other end is connected to powder chamber 12 by connector 65.
In operation, gate valve 28 is activated to the closed position, and the powders to be sprayed through delivery tube 25 are placed into reservoir 10 and fluidized in a conventional manner, i.e.
by air passing through a porous membrane. Thereafter, purging air or - 4 - Mester et al ~S3897 other gas is admitted at low velocity to U-tube 62 at connector 6~.
This low-velocity purging air flows through U-tube 62, powder cham-ber 12 and out of the apparatus through delivery tube 25. The apparatus is thus activated and ready to spray powder on demand. To spray powder, the velocity of the air admitted at U-tube 62 is in-creased as gate valve 28 is opened by air cylinder 14 to admit fluidized powder to powder chamber 12. Thus admitted, the powder is pneumatically ejected through nozzle adapter 18 and delivery pipe 25.
When it is desired that powder spraying be discontinued, air cylinder 14 is activated to close gate valve 28 as the air admitted to the powder chamber 12 is reduced back to a low-velocity purging blow.
Each time gate valve 28 is opened or closed, wiper 30 wipes the edges of opening 26 to remove any agglomerated powder which may have formed thereon. In addition, the low-velocity purging blow maintained through powder chamber 12, nozzle adapter 18 and delivery tube 25 will keep this passageway clear of accumulated powders.
Figures 3 and 4 illustrate a different embodiment of this invention wherein a modified p~wder chamber and gate valve are pro-vided. With reference to Figures 3 and 4, this embodiment comprises a powder chamber 112 having rectangular openings 126 in the upper and lower surfaces thereof. A gate valve 128 to close these openings is provided by inserting a tight fitting slidable sleeve within powder chamber 112. A wiper 130 to wipe the edges of opening 126 is pro-vided by a pair of rectangular flanges on the forward edge of the gate valve 128 which extend through opening 126. In this embodiment, U-tube 162 must be flexible as it is connected to pipe T-coupling 166 which is in turn secured between gate valve 128 and push rod 150.
- 5 - Mester et al : , . . .
, . ~ ~ . -~053897 To open gate valve 128, an air cylinder (no-t shown~ is activated to pull push rod 150 to the left. This pulls T-coupling 166 and gate valve 128 to the left as well as wipers 130 thus exposing the inside of powder chamber 112 to the fluid~zed powders. In all other re-spects, this embodiment is substantially the same as the first described embodiment.
Reference to Figure 5 will illustrate the pneumatic control circuit used to operate the first described embodiment. With refer-ence to Figure 5, compressed air is admitted through valve 70, air and oil filter 72, and filter/dryer 74. From filter/dryer 74, the compressed air follows three lines, one line 76 to activate the fluidized powder reservoir 10, where valve 78 admits air to needle valve 80. Low velocity air flows continuously through needle valve 82 and line 84 to provide the low velocity purging blow through pow- -der chamber 12 and delivery tube 25. A four-way solenoid air valve 86, operated by switch 88 is provided to activate the powder spraying mechanism. When powder is not being sprayed, switch 88 is open and no air is being admitted through valve 86. At this point, only the low velocity purging air is being blown through powder chamber 12, and gate valve 28 thereon is in the closed position so that fluidized powder is not admitted thereto. To commence blowing powder, switch 88 is closed to open valve 86 allowing high velocity air to flow through adjustable air regulator and filter 90 via line 92. From regulator and filter 90, line 93 delivers the high-velocity air to air cylinder 14 to thereby open gate valve 28 and admit ~luidized powder to chamber 14, while line 94 delivers high-velocity air to U-tube 62 and accordingly powder chamber 12 and thus blows the powder therein - 6 - Mester et al , ". . , .: , ' ' ', ;: ' .. ' . ' ,;
' ,, -' ',~ " .` ~- ',,, ' ' ' , .
` -; ' ' " '' . . '' ' ', . . .' through delivery tube 25. When i-t is desired to stop spraying pow-der, switch 88 is reopened which directs the high-velocity air through line 96, and adjustable air regulator and filter 98 to the other end of air cylinder 14 thereby reversing its position to close gate valve 28, while at the same time, the air admitted through line 92 is discontinued. With gate valve 28 closed, only the low-velocity purging air is admitted through powder chamber 14 and delivery tube 25.
In development work testing the above described apparatus, no critical limits were noted with respect to air pressure and flow rates. In order to present a clearer understanding of its operation however, it is noted that the apparatus was operated quite success-fully with source air pressures of 80 to lO0 psi, with purging air blow rates of 35 to 45 CFM, and spraying air blow rates of 80 to 90 CFM. In these tests the delivery tube 25 had an inside diameter of 5 8-inch, with a calculated outlet pressure of about 40 psi.
It is also to be noted that, although a gate valve has been specifically disclosed it is conceivable that any other type of valve could be used which could periodically block the opening through the powder chamber and be self cleaning. Such valve can also be operated by any well known valve operating mechanism.
- 7 - Mester et al .... . . . . . .
.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for pneumatically spraying dry powders through a delivery tube comprising a fluidized bed powder reservoir, a powder chamber housing attached within said reservoir having an elongated chamber therein communicating with said delivery tube and an opening in a wall thereof communicating with the interior of said reservoir through which fluidized powders may be admitted, a valve means for closing said opening, wiper means attached to said valve means for wiping the edges of said opening whenever said valve means is activated to thereby keep said opening clear, means for blowing gas through said powder chamber housing and delivery tube with a low-velocity purging blow when said valve means is in a closed position and with a high-velocity powder spraying blow when said valve means is in the open position.
2. An apparatus according to claim 1 in which said powder chamber housing is attached to an inside wall of said reservoir and said delivery tube is attached on the adjacent outside wall so that the powder chamber and delivery tube communicate through the reser-voir wall.
3. An apparatus according to claim 1 in which said powder chamber housing is of a substantially cylindrical configuration.
4. An apparatus according to claim 1 in which said valve means comprising a slidable gate which is operated by an air cylin-der.
5. An apparatus according to claim 4 in which said air cylinder is attached to an outside wall of said reservoir.
6. An apparatus according to claim 4 in which said slid-able gate comprises a sleeve-shaped member encircling said powder chamber housing.
7. An apparatus according to claim 4 in which said slid-able gate comprises a sleeve-shaped member slidably inserted within said powder chamber housing.
8. An apparatus according to claim 4 in which said wiper means comprises a body attached to said slidable gate extending through the opening in the wall of said powder chamber housing.
9. An apparatus according to claim 4 in which said slid-able gate has an elongated plunger rod attached thereto which extends through at least a portion of the powder chamber and to the delivery pipe such that when the slidable gate is activated to the open posi-tion, said plunger rod is advanced into the delivery tube to loosen any agglomerated powder therein.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US508495A US3899131A (en) | 1974-09-23 | 1974-09-23 | Method and apparatus for spraying agglomerating powders |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1053897A true CA1053897A (en) | 1979-05-08 |
Family
ID=24022980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA227,759A Expired CA1053897A (en) | 1974-09-23 | 1975-05-26 | Method and apparatus for spraying agglomerating powders |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3899131A (en) |
| JP (1) | JPS5147936A (en) |
| CA (1) | CA1053897A (en) |
| DE (1) | DE2542170A1 (en) |
| FR (1) | FR2285182A1 (en) |
| SE (1) | SE7510610L (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL178393C (en) * | 1976-03-08 | 1986-03-17 | Estel Hoogovens Bv | DEVICE FOR MARKING A HOT STEEL SLICE. |
| JPS5776175U (en) * | 1980-10-28 | 1982-05-11 | ||
| JPS59140958U (en) * | 1983-03-11 | 1984-09-20 | 株式会社嘉穂製作所 | Emergency braking system for vehicles traveling on slopes |
| JPS59140959U (en) * | 1983-03-11 | 1984-09-20 | 株式会社嘉穂製作所 | Emergency control braking system for vehicles traveling on slopes |
| US6343897B1 (en) * | 1999-10-19 | 2002-02-05 | Culter-Malone Industries, Inc. | Apparatus and method for spreading particulate materials |
| US6511263B2 (en) | 1999-10-19 | 2003-01-28 | Cutler-Malone Industries, Inc. | System for spreading particulate materials |
| US6915966B2 (en) * | 2003-01-29 | 2005-07-12 | Specialty Minerals (Michigan) Inc. | Apparatus for the gunning of a refractory material and nozzles for same |
| US7854397B2 (en) * | 2005-01-21 | 2010-12-21 | Specialty Minerals (Michigan) Inc. | Long throw shotcrete nozzle |
| CN100391652C (en) * | 2006-10-10 | 2008-06-04 | 陈华 | Nozzle device with automatic on-line dirt eliminating function |
| DE102012210439B4 (en) | 2012-06-20 | 2019-03-14 | Gema Switzerland Gmbh | Apparatus for conveying coating powder from a powder container and method for cleaning a powder conveying apparatus |
| FR3140288A1 (en) * | 2022-09-29 | 2024-04-05 | Safran Nacelles | Nozzle, dynamic projection device, coating method and repair method associated therewith |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191400050A (en) * | 1914-01-01 | 1914-10-29 | James Caine | Improvements in Means for Cleansing Sewers, Drains and like Conduits. |
| US2781154A (en) * | 1955-12-23 | 1957-02-12 | North American Aviation Inc | Metallic powder projector |
| US3284608A (en) * | 1965-09-29 | 1966-11-08 | Ralph C Mcdonald | Cleaner device for welding nozzle |
| US3345111A (en) * | 1966-05-25 | 1967-10-03 | Possis Machine Corp | System for dispensing materials |
| US3430643A (en) * | 1968-03-19 | 1969-03-04 | Us Agriculture | Self-cleaning venting orifice |
-
1974
- 1974-09-23 US US508495A patent/US3899131A/en not_active Expired - Lifetime
-
1975
- 1975-05-26 CA CA227,759A patent/CA1053897A/en not_active Expired
- 1975-08-14 JP JP50099029A patent/JPS5147936A/ja active Pending
- 1975-09-22 DE DE19752542170 patent/DE2542170A1/en not_active Withdrawn
- 1975-09-22 SE SE7510610A patent/SE7510610L/en not_active Application Discontinuation
- 1975-09-23 FR FR7529146A patent/FR2285182A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2285182B1 (en) | 1979-06-22 |
| SE7510610L (en) | 1976-03-24 |
| US3899131A (en) | 1975-08-12 |
| JPS5147936A (en) | 1976-04-24 |
| DE2542170A1 (en) | 1976-04-01 |
| FR2285182A1 (en) | 1976-04-16 |
| AU8397475A (en) | 1977-02-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |
Effective date: 19960508 |
|
| MKEX | Expiry |
Effective date: 19960508 |