EP0971811B1 - Metering device for cryogenic pellets - Google Patents
Metering device for cryogenic pellets Download PDFInfo
- Publication number
- EP0971811B1 EP0971811B1 EP98953103A EP98953103A EP0971811B1 EP 0971811 B1 EP0971811 B1 EP 0971811B1 EP 98953103 A EP98953103 A EP 98953103A EP 98953103 A EP98953103 A EP 98953103A EP 0971811 B1 EP0971811 B1 EP 0971811B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metering
- disk
- metering device
- metering disk
- openings
- 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 - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0092—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed by mechanical means, e.g. by screw conveyors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2
Definitions
- the invention concerns a metering device for cryogenic pellets which are used in a blast cleaning apparatus for treatment of surfaces.
- the cryogenic pellets are by example bars of compressed dry ice (carbon dioxide).
- Metering devices are known from the publication NL-A-9301237. It is found that this device does not function well because the metering device constantly freezes because the metering disk is not sufficiently isolated from the outside air. It is found that the metering disk needs a special surface treatment as lubricating is practical impossible as the operating temperature is about minus 80 degrees Celsius.
- the invention will neutralise these disadvantages by providing the sliding surfaces with a layer of nickel containing very fine ceramic particles, like sapphire with a particle dimension of about 6 micron. Besides the metering disk is pressed between two plates which are elastic but gas-tight connected. The device is completely sealed except the intake and exhaust openings. Ventilation openings are entirely avoided.
- Fig. 1 shows a cross section over the metering device.
- Fig. 2 shows the schema of the blast cleaning installation.
- Fig. 1 is with (1) the metering device indicated. At (2) is the supply of pellets, at (3) the exhaust. With (4) is indicated the metering disk. Metering disk (4) is preferably provided with 8 round holes (5) and is driven by shaft (6). Metering disk (4) rotates between plates (7, 8) where plate (7) carries the supply of pellets (2) and the supply of transport gas (9). Plate (8) carries the bearing with bearing ring (10), synthetic ring (11), securing ring (12) and bearing surface (13). Seal (14) seals shaft against humidity.
- Synthetic ring (11) fastens bearing ring (10) in such a way that small oscillations of shaft (6) are absorbed, where at the same time the bearing construction is sealed against penetration of humidity.
- a metallic seal put together from ring (15) and ring (16) where between is mounted a thin metal bellows (17) and it is preferred that the connection is made by welding.
- metering disk (4) has only one shaft end (6).
- At (18) is one of more tightening bolts which press plates (7) and (8) against metering disk (4) with disk springs.
- the surface (19) of metering disk (4) and plates (7) and (8) is treated with a layer of nickel which is filled with powdered sapphire with a particle dimension of about 6 micron or any other feasible ceramic material. This layer has a low coefficient of friction and can be used as sliding surface without lubricating.
- the bearing surface (13) and the inside surface of bearing ring (10) are treated the same way. Plate (7) and (8) are reduced in thickness and at (20) is machined a recess to prevent irregular wear.
- Fig. 2 shows the design of an installation.
- (21) is the storage chamber
- at (23) are valves and at (24) a reducing valve for transportation gas.
- (25) is the mixing part and (26) the blasting nozzle.
- the blast cleaning installation works as follows: with shaft (6) metering disk (4) is rotated with a (not drawn) variable speed motor. From storage chamber (21) pellets fall via supply (2) in opening (5). When opening (5) arrives before exhaust (3) the pellets are blown by the transportation gas into exhaust (3). The pellets are then going via mixing part (25) with compressed gas to blow nozzle (26).
- metering disk (4) is shut off from the outside air.
- the space (27) between metering disk (4) and seal (15, 16 and 17) is not ventilated. Remaining gas, resting behind in opening (5) after the blowing off of the pellets is not expelled.
- sublimation of for example carbon dioxide in the metering device (1) causes high pressure plates (7) and (8) will part and the gas will be released via supply (2) or exhaust (3) and provoke no damage.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Accessories For Mixers (AREA)
- Carbon And Carbon Compounds (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Discharge Heating (AREA)
Abstract
Description
- The invention concerns a metering device for cryogenic pellets which are used in a blast cleaning apparatus for treatment of surfaces. The cryogenic pellets are by example bars of compressed dry ice (carbon dioxide).
Metering devices are known from the publication NL-A-9301237. It is found that this device does not function well because the metering device constantly freezes because the metering disk is not sufficiently isolated from the outside air. It is found that the metering disk needs a special surface treatment as lubricating is practical impossible as the operating temperature is about minus 80 degrees Celsius. - The invention will neutralise these disadvantages by providing the sliding surfaces with a layer of nickel containing very fine ceramic particles, like sapphire with a particle dimension of about 6 micron. Besides the metering disk is pressed between two plates which are elastic but gas-tight connected. The device is completely sealed except the intake and exhaust openings. Ventilation openings are entirely avoided.
- The invention will be described with the drawings.
- Fig. 1 shows a cross section over the metering device.
Fig. 2 shows the schema of the blast cleaning installation. - In the drawings is the isolation of conduits left out.
In Fig. 1 is with (1) the metering device indicated. At (2) is the supply of pellets, at (3) the exhaust. With (4) is indicated the metering disk. Metering disk (4) is preferably provided with 8 round holes (5) and is driven by shaft (6). Metering disk (4) rotates between plates (7, 8) where plate (7) carries the supply of pellets (2) and the supply of transport gas (9). Plate (8) carries the bearing with bearing ring (10), synthetic ring (11), securing ring (12) and bearing surface (13). Seal (14) seals shaft against humidity. Synthetic ring (11) fastens bearing ring (10) in such a way that small oscillations of shaft (6) are absorbed, where at the same time the bearing construction is sealed against penetration of humidity. Between plates (7) and (8) is a metallic seal, put together from ring (15) and ring (16) where between is mounted a thin metal bellows (17) and it is preferred that the connection is made by welding. metering disk (4) has only one shaft end (6). - At (18) is one of more tightening bolts which press plates (7) and (8) against metering disk (4) with disk springs.
The surface (19) of metering disk (4) and plates (7) and (8) is treated with a layer of nickel which is filled with powdered sapphire with a particle dimension of about 6 micron or any other feasible ceramic material. This layer has a low coefficient of friction and can be used as sliding surface without lubricating. The bearing surface (13) and the inside surface of bearing ring (10) are treated the same way.
Plate (7) and (8) are reduced in thickness and at (20) is machined a recess to prevent irregular wear.
Fig. 2 shows the design of an installation. (21) is the storage chamber, (22) the supply of compressed gas, at (23) are valves and at (24) a reducing valve for transportation gas. (25) is the mixing part and (26) the blasting nozzle. - The blast cleaning installation works as follows: with shaft (6) metering disk (4) is rotated with a (not drawn) variable speed motor. From storage chamber (21) pellets fall via supply (2) in opening (5). When opening (5) arrives before exhaust (3) the pellets are blown by the transportation gas into exhaust (3). The pellets are then going via mixing part (25) with compressed gas to blow nozzle (26).
- It is important for a reliable operation that metering disk (4) is shut off from the outside air. The space (27) between metering disk (4) and seal (15, 16 and 17) is not ventilated. Remaining gas, resting behind in opening (5) after the blowing off of the pellets is not expelled. In the case that sublimation of for example carbon dioxide in the metering device (1) causes high pressure plates (7) and (8) will part and the gas will be released via supply (2) or exhaust (3) and provoke no damage.
Claims (4)
- Metering device for cryogenic pellets for treatment of surfaces which is provided with a metering disk (4) with circular openings (5) where the cryogenic particles are carried with compressed gas to a mixing part (25) characterised by that metering disk (4) rotates between two flat plates (7, 8) which are tightened with springs, where plate (7) is provided with the supply opening (2) and the transport gas opening (9) and in plate (8) the shaft bearing (10, 11, 12 and 13) and the exhaust opening (3), where all sliding surfaces of metering disk (4), plates (7, 8), bearing surface (13) and bearing part (10) are treated with a layer of nickel containing fine ceramic particles, like sapphire with a particle size of about 6 microns while the plates (7, 8) are bound together with sealing ring (15, 16) which is provided with an elastic metal bellows (17).
- Metering device as in claim 1 characterised by that the metering disk (4) contains 8 openings and only one shaft (6).
- Metering device as in claim 1, and 2 characterised by that bearing ring (10) for shaft (6) is secured with a prestressed synthetic ring (11).
- Metering device as in claim 1, 2 and 3 characterised by that openings (5) in metering disk and space (27) around metering disk (4) are not ventilated.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1007421A NL1007421C2 (en) | 1997-11-03 | 1997-11-03 | Metering device for cryogenic particles. |
NL1007421 | 1997-11-03 | ||
PCT/NL1998/000613 WO1999022909A1 (en) | 1997-11-03 | 1998-10-23 | Metering device for cryogenic pellets |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0971811A1 EP0971811A1 (en) | 2000-01-19 |
EP0971811B1 true EP0971811B1 (en) | 2002-09-11 |
Family
ID=19765936
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98953103A Expired - Lifetime EP0971811B1 (en) | 1997-11-03 | 1998-10-23 | Metering device for cryogenic pellets |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0971811B1 (en) |
AT (1) | ATE223787T1 (en) |
AU (1) | AU1056199A (en) |
DE (1) | DE69807855D1 (en) |
NL (1) | NL1007421C2 (en) |
WO (1) | WO1999022909A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1015216C2 (en) * | 2000-05-17 | 2001-11-20 | Hoek Loos Bv | Compressed air and dry ice mixer to produce powerful jet for cleaning |
US6468360B1 (en) * | 2000-07-28 | 2002-10-22 | Benjamin Edward Andrews | Method for cleaning ductwork |
NL1017210C2 (en) * | 2001-01-29 | 2002-07-30 | Huibert Konings | Cryogenic particle dosing device. |
US20030064665A1 (en) * | 2001-09-28 | 2003-04-03 | Opel Alan E. | Apparatus to provide dry ice in different particle sizes to an airstream for cleaning of surfaces |
NL1020072C2 (en) * | 2002-02-27 | 2003-08-29 | Hoek Loos Bv | Device for dry ice blasting. |
ITBO20100586A1 (en) * | 2010-09-30 | 2012-03-31 | Eugenio Curtarello | CLEANING METHOD OF THE SERIGRAPHIC MATRIX WITH CRIOTECHNOLOGIES |
PT2994269T (en) * | 2013-05-06 | 2019-12-10 | Ics Ice Cleaning Systems S R O | Device for mixing solid particles of dry ice with flow of gaseous medium |
EP3099414A2 (en) | 2014-01-27 | 2016-12-07 | Feiba Engineering & Plants GmbH | Adjusting mechanism for roller mills |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4389820A (en) * | 1980-12-29 | 1983-06-28 | Lockheed Corporation | Blasting machine utilizing sublimable particles |
US4463736A (en) * | 1982-06-07 | 1984-08-07 | Hayward Jr Wallace | Chambered rotary metering device |
US4538068A (en) * | 1983-05-03 | 1985-08-27 | The United States Of America As Represented By The United States Department Of Energy | Manipulator having thermally conductive rotary joint for transferring heat from a test specimen |
US4617064A (en) * | 1984-07-31 | 1986-10-14 | Cryoblast, Inc. | Cleaning method and apparatus |
US4744181A (en) * | 1986-11-17 | 1988-05-17 | Moore David E | Particle-blast cleaning apparatus and method |
US5109636A (en) * | 1988-08-01 | 1992-05-05 | Cold Jet, Inc. | Particle blast cleaning apparatus and method |
NL9301237A (en) * | 1993-07-14 | 1995-02-01 | Harko Bv | Method for treating surfaces with cryogenic particles |
US5415584A (en) * | 1993-09-21 | 1995-05-16 | Tomco2 Equipment Company | Particle blast cleaning apparatus |
-
1997
- 1997-11-03 NL NL1007421A patent/NL1007421C2/en not_active IP Right Cessation
-
1998
- 1998-10-23 AT AT98953103T patent/ATE223787T1/en not_active IP Right Cessation
- 1998-10-23 AU AU10561/99A patent/AU1056199A/en not_active Abandoned
- 1998-10-23 EP EP98953103A patent/EP0971811B1/en not_active Expired - Lifetime
- 1998-10-23 WO PCT/NL1998/000613 patent/WO1999022909A1/en active IP Right Grant
- 1998-10-23 DE DE69807855T patent/DE69807855D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AU1056199A (en) | 1999-05-24 |
WO1999022909A1 (en) | 1999-05-14 |
DE69807855D1 (en) | 2002-10-17 |
ATE223787T1 (en) | 2002-09-15 |
EP0971811A1 (en) | 2000-01-19 |
NL1007421C2 (en) | 1999-05-04 |
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