EP0971811A1 - Metering device for cryogenic pellets - Google Patents

Metering device for cryogenic pellets

Info

Publication number
EP0971811A1
EP0971811A1 EP98953103A EP98953103A EP0971811A1 EP 0971811 A1 EP0971811 A1 EP 0971811A1 EP 98953103 A EP98953103 A EP 98953103A EP 98953103 A EP98953103 A EP 98953103A EP 0971811 A1 EP0971811 A1 EP 0971811A1
Authority
EP
European Patent Office
Prior art keywords
metering
disk
metering device
pellets
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.)
Granted
Application number
EP98953103A
Other languages
German (de)
French (fr)
Other versions
EP0971811B1 (en
Inventor
Huibert Konings
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0971811A1 publication Critical patent/EP0971811A1/en
Application granted granted Critical
Publication of EP0971811B1 publication Critical patent/EP0971811B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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.
  • metering disk (4) has only one shaft end (6).
  • At (18) is one of more tightening bolts which press plates
  • 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).
  • 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

The invention concerns a metering device (1) for cryogenic pellets which are used in a blast cleaning apparatus to treat surfaces. The cryogenic pellets are by example bars of compressed dry ice (carbon dioxide). The metering device (1) is characterised by the use of sliding surfaces which are treated with a layer of nickel which contains ceramic material or sapphire powder. The metering device (1) has a metering disk (4) with openings (5) which while turning pass the intake opening (2) and thereafter pass the exhaust (3) opening where the pellets are transported to the mixing unit (25). The metering disk (4) is confined between plates (7, 8) where inbetween an elastic seal (15-17) is placed. The plates (7, 8) are pressed against the metering disk (4) with sets of springs. The metering device (1) has no ventilation openings for the openings (5) in the disk (4) and the space around the disk is not ventilated. The metering disk (4) has only one axis (6) with a bearing (10).

Description

Metering device for cryogenic pellets.
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

Claims .
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), while the plates (7, 8) are bound together with sealing ring (15, 16) which is provided with an elastic metal bellows (17).
2. Metering device as in claim 1 characterised by that all sliding surfaces of metering disk (4), plates (7, 8), bearing surface (13) and bearing part (10) are treated with a layer of nickel with ceramic particles or sapphire.
3. Metering device as in claim 1 and 2 characterised by that the metering disk (4) contains 8 openings and only one shaft (6) .
4. Metering device as in claim 1 , 2 and 3 characterised by that bearing ring (10) for shaft (6) is secured with a prestressed synthetic ring (11).
5. Metering device as in claim 1, 2, 3 and 4 characterised by that openings (5) in metering disk and space (27) around metering disk (4) are not ventilated.
* * * *
EP98953103A 1997-11-03 1998-10-23 Metering device for cryogenic pellets Expired - Lifetime EP0971811B1 (en)

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 true EP0971811A1 (en) 2000-01-19
EP0971811B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015109354A2 (en) 2014-01-27 2015-07-30 Feiba Engineering & Plants Gmbh Adjusting mechanism for roller mills

Families Citing this family (7)

* Cited by examiner, † Cited by third party
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
EP2994269B1 (en) * 2013-05-06 2019-09-04 ICS Ice Cleaning Systems S.r.o. Device for mixing solid particles of dry ice with flow of gaseous medium

Family Cites Families (8)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9922909A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015109354A2 (en) 2014-01-27 2015-07-30 Feiba Engineering & Plants Gmbh Adjusting mechanism for roller mills

Also Published As

Publication number Publication date
ATE223787T1 (en) 2002-09-15
AU1056199A (en) 1999-05-24
EP0971811B1 (en) 2002-09-11
WO1999022909A1 (en) 1999-05-14
NL1007421C2 (en) 1999-05-04
DE69807855D1 (en) 2002-10-17

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