WO2009095695A1 - Améliorations concernant des joints pour séparateur magnétique - Google Patents

Améliorations concernant des joints pour séparateur magnétique Download PDF

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Publication number
WO2009095695A1
WO2009095695A1 PCT/GB2009/000278 GB2009000278W WO2009095695A1 WO 2009095695 A1 WO2009095695 A1 WO 2009095695A1 GB 2009000278 W GB2009000278 W GB 2009000278W WO 2009095695 A1 WO2009095695 A1 WO 2009095695A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
magnetic separator
magnetic
accordance
separator
Prior art date
Application number
PCT/GB2009/000278
Other languages
English (en)
Inventor
Steve Mcallorum
Original Assignee
Eclipse Magnetics Limited
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 Eclipse Magnetics Limited filed Critical Eclipse Magnetics Limited
Publication of WO2009095695A1 publication Critical patent/WO2009095695A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/032—Matrix cleaning systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
    • F16J15/022—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
    • F16J15/028—Sealings between relatively-stationary surfaces with elastic packing the packing being mechanically expanded against the sealing surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/064—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing combining the sealing function with other functions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
    • F16J15/106—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure homogeneous

Definitions

  • the present invention relates to seals and particularly, although not exclusively, to seals surrounding vibrating magnetic separators located in separating apparatus for use within the food and pharmaceutical industries.
  • Food production systems may include several processing stages and associated apparatus. This may include separating apparatus which is arranged to separate and remove contaminants from the material being processed. This is particularly relevant where the material is digestible and is intended for human consumption. This is additionally relevant where the contaminant may pose a health and/or safety risk.
  • magnetic separators are frequently used to extract magnetic (and paramagnetic) particles and fragments from processing material, in particular, powders, granulates, liquids, solutions etc.
  • the present invention is primarily for use with dry materials and dry free flowing products.
  • These magnetic separators may comprise a magnetic grid formed from a number of parallel linear magnetic rods which are supported by an outer frame member. The magnetic separator is then secured within the separating apparatus of a processing system such that the processing material is required to flow through the magnetic grid and the magnetic members may then extract magnetic contaminants.
  • the separating apparatus comprises a inflow region (for example a hopper) and an outflow region such that in use, the processing material is poured into the hopper and then passes through the magnetic grid and then flows out of the outflow region and into further processing apparatus.
  • the magnetic separator includes a seal which surrounds a part of an annular frame member of the magnetic separator in order to seal the magnetic separator in position in the processing apparatus. This seals the magnetic separator in the processing apparatus and ensures that the processing material passes through magnetic separator or more specifically through a magnetic grid.
  • the magnetic separator is arranged, in use, to vibrate or oscillate.
  • the magnetic separator is driven at a high frequency.
  • the magnetic separator may comprise a solid tubular metal outer frame and solid metal magnetic members. Accordingly, since the mass of the magnetic separator may be relatively high, the vibration of the magnetic separator may produce significant momentum and inertia forces. These forces cause mechanical fatigue in the apparatus and components. In particular, if the seal comprises a perishable rubber then this can cause the seal to fail and/or may cause particles of the seal to become separate and mix with the processing material. Accordingly, these fragments of seal may act as contaminants in the processing material.
  • the seal Due to the aforementioned high frequency oscillations of the magnetic separator, the seal is the subject of high wear and may at least partially fail with time. Such failure, especially if relatively minor, may not be readily detectable by an operator. In addition, any fragments from the seal may enter the processing material and subsequently enter the food or pharmaceutical product.
  • a magnetic separator comprising a seal wherein the seal comprises a magnetic detectable material.
  • the seal is resilient.
  • the seal is an annular seal.
  • the magnetic detectable material comprises a ferrous material.
  • the magnetic detectable material may comprise iron and preferably comprises iron filings.
  • the seal comprises an annular seal and more preferably comprises a circular annular seal.
  • the circular annular seal has a circular outer profile and an inner circular profile.
  • the outer profile and the inner profile comprise concentric circles.
  • the seal may comprise a shaped cross sectional profile.
  • the seal comprises a substantially "C" - shaped crossed sectional profile.
  • the seal may comprise an inwardly facing channel shaped cross-section.
  • a cross-section of the seal defines a mouth portion which is arranged to locate over and around a frame member in order for an inner surface of the seal to locate adjacent to an outer surface of the frame member.
  • the seal may comprise a shaped cross-sectional profile having an upper portion and a lower portion and a connecting portion located therebetween.
  • the connecting portion extends between first end of the upper portion and a first end of the lower portion.
  • the seal is arranged, in use, to locate around a frame member and preferably around an annular frame member.
  • the seal is arranged, in use, to locate around an outer frame member of a magnetic separator.
  • the seal is arranged, in use, to be retained around an outer frame member by an interference fit.
  • the seal may comprise a coloured material in order for fragments of the seal to be visually identifiable.
  • the magnetic separator may comprise an annular frame member and a plurality of magnetic rods.
  • the magnetic separator comprises a magnetic array or a magnetic grid.
  • the seal comprises a static dissipative material.
  • the seal comprise an extruded strip which may be subsequently cut and may subsequently be bonded or otherwise secured to form an annular ring.
  • a seal for a magnetic separator wherein the seal comprises a magnetic detectable material.
  • a method of sealing a magnetic separator within separating apparatus comprising locating a seal around an outer frame member of the magnetic separator and wherein the seal comprises magnetic detectable material.
  • Figure 1 is a plan view of a preferred embodiment of a seal for use in a magnetic separator.
  • Figure 2 is a side view of a preferred embodiment of a seal for use in a magnetic separator.
  • Figure 3 is a cross sectional view of a preferred embodiment of a seal for use in a magnetic separator.
  • Figure 4 is a plan view of a magnetic separator including a preferred embodiment of a seal.
  • the separator apparatus includes an inflow region (for example, a hopper) into which the flour is poured. The flour then passes through the magnetic separator where magnetic contaminants are extracted. The flour then flows through an outflow region into the processing apparatus. For example, 25 kg bags of flour may be poured into the hopper in order to be initially screened and cleaned prior to the baking process.
  • the magnetic separator is for use in the food and pharmaceutical industries. Contamination such as rust, stainless steel scrapings and wear from machinery are often too small to be detected by a metal detector but is easily removed by magnetic separators.
  • the contamination is pushed to the undersides of the rods, where it is securely held, out of the way of the wash off effects of continuous material flow.
  • the grid requires no power and no maintenance (except for cleaning) and is quick and easy to install.
  • the strength of the magnetic rods can be selected for either coarse ferrous contamination or for micron sized ferrous contamination and para-magnetic contamination.
  • a magnetic separator 10 comprises an annular frame member 12 and a plurality of parallel magnetic members 14.
  • the magnetic members 14 comprise linear magnetic rods 14 which are retained in the annular frame member 12.
  • the linear magnetic rods 14 form a magnetic array or magnetic grid.
  • the magnetic separator 10 is located in a processing system in order for the magnetic separator 10 to extract magnetic contaminants from a processing material.
  • the magnetic separator 10 may be located in a lower end of a hopper such that the processing material is poured into the hopper and is arranged to pass through the magnetic separator 10.
  • the magnetic rods 14 are arranged in a linear array and provide openings between adjacent magnetic rods 14 for the processing material to flow therethrough.
  • the proximity of the processing material to the magnetic rods 14 is therefore set or controlled.
  • the strength of extraction can be determined by the magnetic strength of the magnetic rods 14 and the separation distance of the magnetic rods 14.
  • the strength of extraction can be set for coarse ferrous contamination and/or for micron sized ferrous contamination and/or for para-magnetic contamination.
  • the magnetic separator 10 is vibrated in order to aid the flow of the processing material through the magnetic separator 10.
  • the magnetic separator 10 may be driven at a relatively high frequency to oscillate the magnetic separator 10 at a high frequency. This movement can cause relatively high momentum and inertia forces in the magnetic separator 10.
  • the vibration of the magnetic separator 10 acts to separate the material and effectively aids the sieving process.
  • the seal 16 of the magnetic separator is arranged to locate around an outer frame member 12 of the magnetic separator 10.
  • the processing apparatus comprises a securement mechanism for securing the magnetic separator 10 within the processing apparatus.
  • the securement mechanism may comprise a clamping mechanism whereby the outer frame member 12 and the seal 16 are clamped into position within the processing apparatus.
  • the securement mechanism may comprise over centre toggle clips radially spaced around the apparatus.
  • the seal 16 is therefore compressed, in use.
  • the sieve plate may be changed frequently and may be changed each time as new material is used in the apparatus. Accordingly, the seal may be regularly compressed and uncompressed. As the magnetic separator 10 is vibrated, the high momentum and inertia forces are dissipated and transmitted through the seal 16.
  • the seal 16 is, therefore, prone to fatigue failure and may crack or split.
  • fragments of the seal 16 may be dislodged or other parts of the seal 16 may become separated from the seal. These fragments or parts will then enter the processing material and will act as a contaminant to the processing material.
  • the present invention provides a seal 16 of a magnetic detectable material such that any fragments can be relatively easily detected and extracted.
  • the seal 16 since the seal 16 is for use around a magnetic separator 10 and the seal 16 comprises a magnetic detectable material, any contamination comprising fragments of the seal will be immediately detected and extracted by the magnetic separator 10.
  • magnetic detection and magnetic extraction apparatus are frequently used further down the processing line from the magnetic separator 10. Such magnetic detection and magnetic extraction apparatus may further ensure that fragments of the seal are not present in the final product. Accordingly, the magnetic separator 10 may be used as an initial magnetic separator and any any missed fragments may subsequently be detected and extracted further down the processing line.
  • the seal 16 may comprise a circular annular member and comprises a resilient material incorporating a magnetic material.
  • the magnetic material comprises a ferromagnetic material.
  • the ferromagnetic material comprises iron and in particular, comprises iron filings. The iron filings are distributed substantially uniformly throughout the material of the seal.
  • the seal 16 comprises an annular member which has a substantially uniform cross section (as shown in figure 3).
  • the seal 16 has an inner periphery which is circular and has an outer periphery which is circular. The inner periphery and the outer periphery comprise concentric circles.
  • the seal 16 has a substantially C - shaped cross section such that the cross section comprises an upper projection 18 which locates on an upper surface of the annular frame member 12 of the magnetic separator 10, a side section 20 which locates adjacent to a side surface of the annular frame member 12 of the magnetic separator 10 and a lower projecting surface 22 which locates adjacent a lower surface of the annular frame member 12 of the magnetic separator 10.
  • the seal 16 is arranged to be retained to the annular frame member 12 and secured to the annular frame member 12 by an interference fit. Accordingly, in use, the seal 16 is stretched to fit over the annular frame member 12 and is then held securely in place by the interference fit.
  • An upper surface of the upper projecting surface 18 may comprise raised surfaces 19 or a raised pattern which may improve the sealing characteristics of the seal 16.
  • the lower surface of the lower projecting surface 22 may comprise a raised surface 23 or raised pattern which may improve the sealing and characteristics of the seal 16.
  • the seal 16 is formed from an extruded strip which is cut to the required length and then bonded to form an annular ring seal of the correct circumference/diameter.
  • the annular frame member 12 includes rounded corners in order to prevent piercing or otherwise damaging the seal 16.
  • the seal 16 comprises a resilient material and in particular comprises a resilient plastics or a rubber.
  • the seal 16 comprises a coloured material such that the seal 16 or parts of the seal 16 are easily visually identifiable by a person such that relatively large fragments of the seal 16 may also be identified visually by a worker and removed by the worker.
  • the colour of the seal 16 may be selected to be prominent and contrast with the respective to the colour of the processing material.
  • the seal 16 is blue.
  • the processing apparatus may include a visual sensor to sense the presence of a fragment of the seal 16.
  • the construction of the present invention helps to provide a current pharmaceutical standard magnetic separator to be commercially available to the food industry which generally use less expensive apparatus.
  • the seal 16 may comprise a static dissipative material.
  • the present invention thereby provides a magnetic separator with increased reliability with respect to prior art magnetic separators.
  • the present invention also provides a magnetic separator which does not include small parts which can be misplaced, lost or inadvertently separated.
  • the present invention may also help to provide a magnetic separator which is particularly for use in explosive atmospheres in the work place caused by flammable gases, mists or vapours or by combustible dusts.
  • the present invention may be designed for use in accordance with the DSEAR and ATEX framework for controlling explosive atmospheres and the standard of equipment and protective systems used therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Centrifugal Separators (AREA)

Abstract

L'invention concerne un séparateur magnétique (10), qui, lorsqu'il est en fonctionnement, est agencé au sein d'un appareil de séparation dans le but d'extraire des contaminants magnétiques de matériaux et, en particulier, de matériaux secs non-agglomérants, tels que de la farine. Le nouveau séparateur magnétique (10) comprend un élément de châssis annulaire (12) et une pluralité d'éléments magnétiques parallèles (14). Lorsqu'il est en fonctionnement, le séparateur magnétique est mis en vibration afin d'aider l'écoulement du matériau au travers de l'appareil. Le séparateur magnétique est enfermé de manière hermétique au sein de l'appareil de traitement grâce à l'utilisation d'un joint résilient qui est comprimé entre le séparateur magnétique et le mécanisme sécurisé. En conséquence, lorsque le séparateur magnétique (10) est mis en vibration, le joint est soumis à des forces élevées qui peuvent le fracturer ou bien le faire céder défaillant avec le temps. Le joint comprend un matériau magnétique détectable de telle sorte que, si une partie du joint est séparée et pénètre dans le matériau, des moyens magnétiques peuvent ensuite extraire ce contaminant de manière à empêcher la partie du joint de pénétrer dans le produit final.
PCT/GB2009/000278 2008-01-31 2009-01-30 Améliorations concernant des joints pour séparateur magnétique WO2009095695A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0801739A GB2456875A (en) 2008-01-31 2008-01-31 A seal for a magentic separator
GB0801739.4 2008-01-31

Publications (1)

Publication Number Publication Date
WO2009095695A1 true WO2009095695A1 (fr) 2009-08-06

Family

ID=39186618

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2009/000278 WO2009095695A1 (fr) 2008-01-31 2009-01-30 Améliorations concernant des joints pour séparateur magnétique

Country Status (2)

Country Link
GB (1) GB2456875A (fr)
WO (1) WO2009095695A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106076611A (zh) * 2016-05-12 2016-11-09 刘锡云 流动粒粉静电消除磁力分离器
US9494756B2 (en) 2015-01-27 2016-11-15 Hoffman Enclosures, Inc. Hole seal for an enclosure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3240341A (en) * 1963-01-14 1966-03-15 Rosaen Filter Co Magnetized gasket assembly
US3406979A (en) * 1965-02-19 1968-10-22 California Fruit Concentrates Reinforced o-ring
GB2368100A (en) * 2000-10-19 2002-04-24 Rolls Royce Plc Seal fitting
US20070023326A1 (en) * 2003-06-09 2007-02-01 Armstrong Peter D Magnetic separator apparatus
EP1806523A1 (fr) * 2006-01-10 2007-07-11 Carl Freudenberg KG Joint d'étanchéité

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1137422A (zh) * 1995-06-05 1996-12-11 北京矿冶研究总院 永磁磁选机磁筒密封新结构
AU2002230479A1 (en) * 2000-11-21 2002-06-03 Biocrystal Ltd. Cell culture apparatus and methods of use
US20040245179A1 (en) * 2001-12-21 2004-12-09 Elsegood Stewart D. Magnetic fluid filter adapter
JP2004217821A (ja) * 2003-01-16 2004-08-05 Toyo Seal Kogyo Kk 磁性体を配合したエラストマーを用いたシール製品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3240341A (en) * 1963-01-14 1966-03-15 Rosaen Filter Co Magnetized gasket assembly
US3406979A (en) * 1965-02-19 1968-10-22 California Fruit Concentrates Reinforced o-ring
GB2368100A (en) * 2000-10-19 2002-04-24 Rolls Royce Plc Seal fitting
US20070023326A1 (en) * 2003-06-09 2007-02-01 Armstrong Peter D Magnetic separator apparatus
EP1806523A1 (fr) * 2006-01-10 2007-07-11 Carl Freudenberg KG Joint d'étanchéité

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9494756B2 (en) 2015-01-27 2016-11-15 Hoffman Enclosures, Inc. Hole seal for an enclosure
CN106076611A (zh) * 2016-05-12 2016-11-09 刘锡云 流动粒粉静电消除磁力分离器

Also Published As

Publication number Publication date
GB2456875A (en) 2009-08-05
GB0801739D0 (en) 2008-03-05

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