WO1985002014A1 - Dispositif rotatif de depot de particules - Google Patents

Dispositif rotatif de depot de particules Download PDF

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Publication number
WO1985002014A1
WO1985002014A1 PCT/GB1984/000367 GB8400367W WO8502014A1 WO 1985002014 A1 WO1985002014 A1 WO 1985002014A1 GB 8400367 W GB8400367 W GB 8400367W WO 8502014 A1 WO8502014 A1 WO 8502014A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
magnet
skirt
air
liquid medium
Prior art date
Application number
PCT/GB1984/000367
Other languages
English (en)
Inventor
David Brian Jones
Alwyn Lewis Price
Original Assignee
The University College Of Swansea
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 The University College Of Swansea filed Critical The University College Of Swansea
Priority to GB08515680A priority Critical patent/GB2172220B/en
Publication of WO1985002014A1 publication Critical patent/WO1985002014A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0266—Investigating particle size or size distribution with electrical classification

Definitions

  • British Patent Specification 2103358 discloses an improved method of analysing magnetically or electrically polarised or polarisable particles carried in a liquid medium and an improved apparatus (referred to herein as a "Rotary Particle Depositor") for causing particles which can be made to move by a force field to ⁇ be deposited by the force field on a substrate for subse ⁇ quent analysis.
  • a major use of the method and apparatus as aforesaid is in the analysis of wear particles suspended in a used lubricating oil, and such analyses can be made on a rou ⁇ tine basis requiring several deposit samples to be pro ⁇ quizzed each hour.
  • the invention relates to improvements in the method and apparatus described in the aforesaid British patent application which, inter alia, make it more convenient to use.
  • a method of analysing particles which can be made to move by a force field and carried in a liquid medium which method involves the steps of flowing the liquid medium over a rotating substrate under the influence of a force field which is stationary with respect to the substrate, to cause the particles to be deposited on the substrate and analysing the thus deposited particles, is character ⁇ ised in that the substrate is temporarily fixed relative to a rotating source of the force field by engaging the underside of the substrate with an annular skirt of flex ⁇ ible air-impermeable material which, in its relaxed state, surrounds, but lies above, the level of the upper surface of the field source and defines, when in deformed contact with the substrate an air-tight volume, pressing the sub ⁇ strate down towards the field source to deform the skirt and force some air in said volume outwardly thereof past said skirt and releasing said substrate so that the par ⁇ tial vacuum now appearing in said volume effects a seal between the deformed skirt and the underside of the sub- strate.
  • the substrate e.g. a square microscope slide cover plate
  • the substrate is temporarily fixed over a rotating
  • ⁇ magnet by engaging the underside of the substrate with an annular skirt of flexible air-impermeable material which, in its relaxed state, surrounds, but lies above, the level of the upper surface of the magnet and defines, when in deformed contact with the substrate an air-tight volume.
  • Uncoloured transparent glass plates some 25 mm square and one or two tenths of a mm thick make good substrate material but are difficult to handle without cracking the ⁇ i and are thus difficult to fix quickly and accurately to the field source of a rotary particle depositor.
  • Using an annular skirted member in the manner described above forms a seal quickly and reliably, merely by pressing the substrate plate down and then releasing it.
  • the partial vacuum holding the substrate plate in place can be released, when the deposit sample has been formed thereon, by deforming the annular skirt, to break the air-tightness of the volume defined within it.
  • the annular skirt suitably forms an extension of an annular ring which contributes to the sealing of the said volume, and a tab can be attached to the ring to extend radially outwardly thereof, whereby pulling on the tab when the skirt is pressed down under a partial vacuum in the closed volume, will break the air-tightness of the volume and allow the skirt to flex upwardly towards its relaxed state as atmospheric pressure returns to the volume.
  • Pressing the substrate plate onto the annular skirt can conveniently be effected using a plunger, and a pre ⁇ ferred rotary particle depositor in accordance with the invention will have a turntable mounted above the field source to turn about an axis displaced to one side of the rotating axis of the field source, this turntable mounting not only syringes to dispense, in turn, sample liquid and washing liquid onto the substrate plate, but also a spring-returned plunger to effect the above- described sealing method.
  • a rotary particle depositor comprising a magnet, a substrate of non-magnetic material located adjacent to the magnet so that a magnetic force field from the magnet has a com ⁇ ponent passing through the substrate substantially normal thereto, means to secure the substrate adjacent to the magnet, means to dispense a particle-containing liquid medium onto the substrate, and means to rotate the sub- strate and magnet together to cause the dispensed liquid medium to flow across the substrate as the particles therein are attracted by the force field down onto the substrate, is characterised in that the means to secure the substrate adjacent to the magnet comprises an annular skirt of flexible air-impermeable material which surrounds the magnet, the annular skirt enclosing, with the sub ⁇ strate an air-tight volume which can be reduced in volume by pressing the substrate down onto the magnet.
  • the magnet is of cylindrical form-and is slidably disposed in a cylindrical recess which is coaxial with the rotating axis of the magnet.
  • the underside of the said recess can be tapped and normally contain a sealing screw which ensures the recess is air-tight when covered by the substrate plate. Removing the sealing screw, permits a magnet expulsion member (e.g. another, but longer, screw) to be moved up into the recess to
  • Figure 1 is a side elevation of the turntable assem- bly of the rotary particle depositor
  • Figure 2 is a plan of the turntable assembly of Figure 1
  • Figure 3 is an enlarged sectional view of the magnet assembly of the rotary particle depositor
  • Figures 4a and 4b are further enlarged sectional views illustrating the sealing method.
  • the rotary particle depositor illustrated in the drawings applies the method claimed in UK-A-2103358 and includes a motor 1 for rotating a magnet 2 with a cup 3 screw-threaded into a dish member 4.
  • a particle-contaminated sample is dripped onto a glass plate 5 from a syringe 6 occupying one station of a rotatable turntable 7 while the magnet 2, cup 3 and dish member 4 are rotating (typically in the speed range 40 to 80 rpm).
  • - UR OMP ⁇ sample are attracted down onto the plate 5 as the liquid flows across the surface of the plate under the influence of centrifugal force.
  • the turntable 7 is notched round to leave a second syringe 8 above the plate 5.
  • the syringe 8 is linked by tubing 9 to a bottle of washing liquid (not shown) and residual carrier liquid is rinsed from the plate 5 leaving the deposited particles in place.
  • the speed range during washing is typically 0 to 150 rpm. Excess washing liquid can be removed in a drying phase when a rotating speed of (say) 150 to 250 rpm could be used.
  • a plunger 10 On the turntable 7 is a plunger 10 with a pressure pad 11 spring-urged upwardly. By rotating the turntable 7, this plunger 10 can be moved round to lie above the magnet 2, and the pad 11 can then be used to seal the plate 5 to the rotating magnet assembly 2, 3 at the start of a deposit operation as is now made clear.
  • An annular seal 12 (see Figures 3 and 4a, 4b) is located around the cup 3. It comprises a flexible frusto- conical skirt 13 integral with a base ring 14 defining an inner cylindrical surface 14a and an annular end face 14b.
  • the seal 12 is dimensioned so that the surface 14a snugly embraces the upper cylindrical end of the cup 3.and so that the upper edge of the skirt 13 is norm ⁇ ally disposed above the upper surface 2a of the magnet 2.
  • the seal 12 can be provided with one or more tabs 15 which can be pulled to deform the ring 14 and break the seal at the surface 14a.
  • the seal 12 can be a "V-seal" as » made by Headland and can be of nitrile rubber, or the like.
  • Figure 3 shows that the cup 3 is provided with a screw-threaded bore 20. Normally this is closed with an air-tight seal (the screw 21) but following removal of the cup 3 from the dish member 4 and removal of the seal 21, a magnet-expelling member can be moved up through the bore 20.
  • the magnet 2 shown in Figure 3 is a tube and rod cylindrical magnet with a solid mass (e.g. of "Perspex"RTM ) filling the annular gap between the cylin ⁇ der and the rod.
  • Other magnet configurations can be used however and the facility for easy magnet removal, allows one magnet to be changed for another when required.
  • the dish member 4 can be provided with a spout 25 to drain into a fixed annular gulley 26 connected to a drain bottle via a tube (not shown).
  • the plunger 10 can also be used to transfer a plate from a reservoir of such plates to the rotating magnet assembly 2, 3. This can be effected, for example, by providing the pad 11 with means to lightly adhere to a plate and lowering the pad onto the uppermost plate of a stack of such plates prior to rotating the turntable 7 to leave the pad 11 above the seal 12. The adherence of the plate to the pad 11 must ultimately be less firm than that provided by the seal 12 (so that the plate 5 is left correctly fixed over the magnet assembly 2,
  • _ OMPI 3 when the plate-loading operation has been completed and the pad 11 lifted clear
  • light suction can be applied via a second frusto-conical flexible seal on the pad 11, which second seal can be of smaller diameter than the seal 12.
  • a porous central area of the pad 11 can be connected via the stem of the plunger 10 to a rubber bulb, and the bulb can be used to control the vacuum temporarily holding the plate 5 on to the underside of the pad 11. It is even possible to employ small areas of a tacky material on the pad 11 provided these do not leave a deposit on the measuring area of the plate 5.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Thin Magnetic Films (AREA)

Abstract

Dans un dispositif rotatif de dépôt de particules, servant à l'analyse de routine de particules polarisées ou polarisables électriquement ou magnétiquement et entraînées dans un milieu liquide par précipitation des particules à partir du liquide à l'aide d'un champ de force électrique ou magnétique sur un substrat (5), tout en faisant tourner ce substrat (5) pour déplacer le milieu liquide au travers de la surface du substrat, une jupe annulaire flexible et imperméable à l'air (2) est utilisée pour maintenir temporairement le substrat (5) sur la source (2) du champ de force en créant un vide partiel à l'intérieur de la jupe (12) sous le substrat (5).
PCT/GB1984/000367 1983-11-01 1984-10-31 Dispositif rotatif de depot de particules WO1985002014A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08515680A GB2172220B (en) 1983-11-01 1984-10-31 Rotary particle depositor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838329151A GB8329151D0 (en) 1983-11-01 1983-11-01 Rotary particle depositor
GB8329151 1983-11-01

Publications (1)

Publication Number Publication Date
WO1985002014A1 true WO1985002014A1 (fr) 1985-05-09

Family

ID=10551047

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1984/000367 WO1985002014A1 (fr) 1983-11-01 1984-10-31 Dispositif rotatif de depot de particules

Country Status (3)

Country Link
EP (1) EP0160067A1 (fr)
GB (2) GB8329151D0 (fr)
WO (1) WO1985002014A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0450987A2 (fr) * 1990-04-06 1991-10-09 Dennis Amerena Parker Perfectionnements aux dispositifs de mesure d'échantillons de débris
US10451603B2 (en) 2014-11-21 2019-10-22 Vestas Wind Systems A/S Contaminant sensor for detecting magnetizable contaminants in lubricant flow

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI74199C (fi) * 1987-02-27 1988-01-11 Pentti Mauri Kummunsalo Anordning foer ett paraply eller liknande.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870014A (en) * 1973-05-24 1975-03-11 Corning Glass Works Liquid and aerosol collecting device
US4103643A (en) * 1973-03-26 1978-08-01 The Perkin-Elmer Corporation Aerosol-reducing slide holder system
EP0070148A1 (fr) * 1981-07-09 1983-01-19 David Gwynne Jones Procédé et appareil de détection de particules dans un milieu liquide

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4103643A (en) * 1973-03-26 1978-08-01 The Perkin-Elmer Corporation Aerosol-reducing slide holder system
US3870014A (en) * 1973-05-24 1975-03-11 Corning Glass Works Liquid and aerosol collecting device
EP0070148A1 (fr) * 1981-07-09 1983-01-19 David Gwynne Jones Procédé et appareil de détection de particules dans un milieu liquide

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0450987A2 (fr) * 1990-04-06 1991-10-09 Dennis Amerena Parker Perfectionnements aux dispositifs de mesure d'échantillons de débris
EP0450987A3 (en) * 1990-04-06 1992-10-14 Dennis Amerena Parker Improvements relating to debris sample measurement devices
US10451603B2 (en) 2014-11-21 2019-10-22 Vestas Wind Systems A/S Contaminant sensor for detecting magnetizable contaminants in lubricant flow

Also Published As

Publication number Publication date
GB8515680D0 (en) 1985-07-24
GB2172220A (en) 1986-09-17
GB8329151D0 (en) 1983-12-07
EP0160067A1 (fr) 1985-11-06
GB2172220B (en) 1987-05-13

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