WO1999024144A1 - Screen for use in vibratory shaker device - Google Patents

Screen for use in vibratory shaker device Download PDF

Info

Publication number
WO1999024144A1
WO1999024144A1 PCT/GB1998/003355 GB9803355W WO9924144A1 WO 1999024144 A1 WO1999024144 A1 WO 1999024144A1 GB 9803355 W GB9803355 W GB 9803355W WO 9924144 A1 WO9924144 A1 WO 9924144A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
cradle
mesh
tensioning
assembly
Prior art date
Application number
PCT/GB1998/003355
Other languages
French (fr)
Inventor
Ronald George Morris
Lyall Rennie
Original Assignee
Its Drilling Services 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 Its Drilling Services Limited filed Critical Its Drilling Services Limited
Priority to GB0009827A priority Critical patent/GB2346817B/en
Publication of WO1999024144A1 publication Critical patent/WO1999024144A1/en
Priority to NO20002402A priority patent/NO20002402L/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/48—Stretching devices for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/012—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/01—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons
    • B01D33/03—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4663—Multi-layer screening surfaces

Definitions

  • This invention relates to a screen for apparatus for filtering cuttings from drilling fluid .
  • Vibratory screening apparatus or shale shakers , are known in the art of filtering cuttings from drilling fluid .
  • a screen for use in apparatus for screening cuttings from drilling fluid comprising a filter means, a support for the filter means and means for tensioning the filter means.
  • One advantage of the invention is to provide a system to attach a filtering screen to a screen-carrying cradle and to tension the filtering screen onto the screen carrying cradle.
  • the cradle with the filtering screen attached and tensioned can then be inserted into a vibratory shaker.
  • the tensioning means is preferably adjustable in situ so that the tension on the screen can be adjusted after the screen has been assembled.
  • the filter means and the support are preferably attachable to a separate supporting cradle and the tensioning means is optionally disposed on the cradle, and is preferably integral therewith.
  • the tensioning means can comprise rams which are operable to force apart two opposing parts of the cradle.
  • the rams can be operated by hand, or by hydraulic or pneumatic forces common in the art .
  • the rams are actuated by hand, and comprise bolt stems upon which are located nuts which can be driven along the stems against an opposing portion of the cradle.
  • two or more meshes are provided on the screen, and in one embodiment of the invention only one of the meshes is tensioned, and the other mesh is not subjected to substantial tension.
  • the upper mesh is preferably tensioned.
  • the meshes are preferably encapsulated into a plastic coating on the screen.
  • the support for the screen may be in the form of a grid with cross and transverse members with square apertures of alternatively can have other shapes of apertures such as triangles etc.
  • the screen is preferably capable of being disposed in vibratory screening apparatus.
  • the invention provides a system where the filtering screen and carrying cradle are two separate components, and a system where a filtering screen is loaded onto a carrying cradle and tensioned prior to inserting into the vibratory shaker basket.
  • Fig 1 is a perspective exploded view of a screen according to one embodiment of the invention
  • Fig 2 is an end exploded view of the components of the screen
  • Fig 3 is a side view of the assembled screen
  • Fig 4 is a perspective view of a cradle used with one embodiment of the invention
  • Fig 5 is an end sectional view of the screen and assembled cradle shown in the previous figures.
  • a screen of the invention comprises a frame 1 of sheet steel which is punched or cut so as to provide a grid of apertures. This sheet is then coated with a plastics material, eg the sheet can be immersed in a liquid plastics material, which can be allowed to dry to a solid film covering the frame 1, or a sheet of plastics material can simply be overlaid on the frame 1.
  • a panel of coarse support mesh 2 is then placed on top of the frame 1.
  • a panel of fine filtering mesh 3 is then placed on top of the coarse mesh 2, and this mesh 3 is optionally tensioned longitudinally on the frame 1 at this point. Pressure and temperature are then applied via a heated platen to the top surface of the filtering mesh 3.
  • a pair of hook strips 4 are then attached to the sides of the screen panel by spot welding to the steel frame 1.
  • the frame 1 carrying the meshes 2, 3 and the hook strips 4 is then attached to a cradle 5.
  • One embodiment of the cradle 5 has a flat surface with supporting slats 5s to support the mesh and is divided into two portions 5a and 5b.
  • the slats 5s of the portion 5a are bounded by a frame 5f, which has apertures to receive posts 15 located on a second portion 5b of the cradle 5, so that the posts 15 are slidable in the apertures, and the two portions can move relative to one another, and parallel to the posts.
  • the screen is located on the cradle 5 by means of blades 10 on each side of the cradle 5 which engage the hook strips 4 of the screen.
  • the cradle 5 has means of tensioning the screen after the screen has been loaded onto the cradle 5. An example of this is shown in Fig. 4.
  • the screen is supported by the slats 5s of the cradle.
  • Tension to the screen is then applied by moving the telescopic part of the cradle outwards from the cradle 5. This movement may be achieved by a screw jack system as shown in Fig. 4 or by any other means such as hydraulics or pneumatics.
  • the tensioning means employs 3 bolts 12 located on the first portion 5a of the cradle 5 between the first 5a and second portions 5b of the cradle 5. Nuts (not shown) can be driven along the bolts to space the two portions 5a, b from one another, sliding the posts 15 of the second portion in the apertures, and thereby tensioning the screen.
  • the nuts can be tensioned by conventional spanners etc or by rods which can be located in apertures (not shown) in the flats of the nuts in order to rotate the nuts on the bolt stems 12.
  • a further embodiment of the cradle has an arched configuration whereby the centre of the cradle is around 5-8mm above each of the ends. This configuration forces the screen to adopt the same arched configuration when tension is applied to it by the expansion of the cradle.
  • a further embodiment of the cradle replaces the bolt stems 12 and nuts of the tensioning system shown in fig 4 with a modified design which uses a cam to push over centre an elbow of a locking arm disposed between the first and second portions a,b of the cradle, so that the arm is moved by the cam to an extended position at which the portions a,b are further apart and the screen is tensioned.
  • FIG. 6 and 7 A further embodiment of the cradle is shown in Figs. 6 and 7.
  • the first portion 5a and the second portion 5b of the cradle each have a cam collar 6a, b welded to the stems 12 A Collars 6a, b are of opposite hands.
  • the first and second portions 5 'a, 5'b of the cradles are assembled with a tension pin carrier 7 located between the cam collars 6a, b.
  • the tension pin carrier 7 is fitted with a tensioning pin 8 at each end.
  • the tensioning pins 8 abut the cam surfaces on respective cam collars.
  • the hexagonal profile of the tension pin carrier 7 enables it to be rotated by a spanner.
  • Fig. 6 shows the mechanism in the screen loading position.
  • the tensioning pin carrier 7 is rotated by means of a spanner through 180 degrees.
  • the pin 8 travels along the cam surfaces pushing the cam collars (and therefore the cradle portions 5 'a, 5'b) in opposite directions thereby applying tension to the screen.
  • the tensioning pins are in an over- centre cam position 9 (Fig. 7) to ensure that the cam system cannot lose tension due to vibration.
  • the cam collars 6a, b and the tensioning pins 8 are hardened to minimise wear.
  • Each cradle is fitted with three of these screen tensioning cam mechanisms.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

A screen and screen assembly for filtering cuttings from drilling mud, the screen comprising two or more filter meshes bonded to a support frame and arched over a cradle. The cradle (5) has tensioning blades (10) to extend the cradle and apply tension to the screen when so attached.

Description

SCREEN FOR USE IN VIBRATORY SHAKER DEVICE
This invention relates to a screen for apparatus for filtering cuttings from drilling fluid .
Vibratory screening apparatus , or shale shakers , are known in the art of filtering cuttings from drilling fluid .
According to the present invention there is provided a screen for use in apparatus for screening cuttings from drilling fluid, the screen comprising a filter means, a support for the filter means and means for tensioning the filter means.
One advantage of the invention is to provide a system to attach a filtering screen to a screen-carrying cradle and to tension the filtering screen onto the screen carrying cradle. The cradle with the filtering screen attached and tensioned can then be inserted into a vibratory shaker.
The tensioning means is preferably adjustable in situ so that the tension on the screen can be adjusted after the screen has been assembled. The filter means and the support are preferably attachable to a separate supporting cradle and the tensioning means is optionally disposed on the cradle, and is preferably integral therewith. The tensioning means can comprise rams which are operable to force apart two opposing parts of the cradle. The rams can be operated by hand, or by hydraulic or pneumatic forces common in the art . In one embodiment the rams are actuated by hand, and comprise bolt stems upon which are located nuts which can be driven along the stems against an opposing portion of the cradle.
Preferably two or more meshes are provided on the screen, and in one embodiment of the invention only one of the meshes is tensioned, and the other mesh is not subjected to substantial tension. The upper mesh is preferably tensioned.
The meshes are preferably encapsulated into a plastic coating on the screen. The support for the screen may be in the form of a grid with cross and transverse members with square apertures of alternatively can have other shapes of apertures such as triangles etc.
The screen is preferably capable of being disposed in vibratory screening apparatus.
The invention provides a system where the filtering screen and carrying cradle are two separate components, and a system where a filtering screen is loaded onto a carrying cradle and tensioned prior to inserting into the vibratory shaker basket.
An embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which; Fig 1 is a perspective exploded view of a screen according to one embodiment of the invention; Fig 2 is an end exploded view of the components of the screen; Fig 3 is a side view of the assembled screen; Fig 4 is a perspective view of a cradle used with one embodiment of the invention; and Fig 5 is an end sectional view of the screen and assembled cradle shown in the previous figures.
Referring now to the drawings, a screen of the invention comprises a frame 1 of sheet steel which is punched or cut so as to provide a grid of apertures. This sheet is then coated with a plastics material, eg the sheet can be immersed in a liquid plastics material, which can be allowed to dry to a solid film covering the frame 1, or a sheet of plastics material can simply be overlaid on the frame 1. A panel of coarse support mesh 2 is then placed on top of the frame 1. A panel of fine filtering mesh 3 is then placed on top of the coarse mesh 2, and this mesh 3 is optionally tensioned longitudinally on the frame 1 at this point. Pressure and temperature are then applied via a heated platen to the top surface of the filtering mesh 3. The transfer of heat through both meshes will soften the plastic coating on the steel frame 1. The pressure applied by the platen will cause the softened plastic to flow around the wires of the meshes thus encapsulating the meshes in the plastic. When the heat (and optionally pressure) is removed the plastic will harden around the meshes 2, 3 providing permanent encapsulation.
A pair of hook strips 4 are then attached to the sides of the screen panel by spot welding to the steel frame 1. The frame 1 carrying the meshes 2, 3 and the hook strips 4 is then attached to a cradle 5. One embodiment of the cradle 5 has a flat surface with supporting slats 5s to support the mesh and is divided into two portions 5a and 5b. The slats 5s of the portion 5a are bounded by a frame 5f, which has apertures to receive posts 15 located on a second portion 5b of the cradle 5, so that the posts 15 are slidable in the apertures, and the two portions can move relative to one another, and parallel to the posts.
The screen is located on the cradle 5 by means of blades 10 on each side of the cradle 5 which engage the hook strips 4 of the screen.
The cradle 5 has means of tensioning the screen after the screen has been loaded onto the cradle 5. An example of this is shown in Fig. 4. The screen is supported by the slats 5s of the cradle. Tension to the screen is then applied by moving the telescopic part of the cradle outwards from the cradle 5. This movement may be achieved by a screw jack system as shown in Fig. 4 or by any other means such as hydraulics or pneumatics.
The tensioning means employs 3 bolts 12 located on the first portion 5a of the cradle 5 between the first 5a and second portions 5b of the cradle 5. Nuts (not shown) can be driven along the bolts to space the two portions 5a, b from one another, sliding the posts 15 of the second portion in the apertures, and thereby tensioning the screen. The nuts can be tensioned by conventional spanners etc or by rods which can be located in apertures (not shown) in the flats of the nuts in order to rotate the nuts on the bolt stems 12. A further embodiment of the cradle has an arched configuration whereby the centre of the cradle is around 5-8mm above each of the ends. This configuration forces the screen to adopt the same arched configuration when tension is applied to it by the expansion of the cradle.
A further embodiment of the cradle replaces the bolt stems 12 and nuts of the tensioning system shown in fig 4 with a modified design which uses a cam to push over centre an elbow of a locking arm disposed between the first and second portions a,b of the cradle, so that the arm is moved by the cam to an extended position at which the portions a,b are further apart and the screen is tensioned.
A further embodiment of the cradle is shown in Figs. 6 and 7. The first portion 5a and the second portion 5b of the cradle each have a cam collar 6a, b welded to the stems 12 A Collars 6a, b are of opposite hands. The first and second portions 5 'a, 5'b of the cradles are assembled with a tension pin carrier 7 located between the cam collars 6a, b. The tension pin carrier 7 is fitted with a tensioning pin 8 at each end. The tensioning pins 8 abut the cam surfaces on respective cam collars. The hexagonal profile of the tension pin carrier 7 enables it to be rotated by a spanner.
Fig. 6 shows the mechanism in the screen loading position. After the screen has been loaded the tensioning pin carrier 7 is rotated by means of a spanner through 180 degrees. The pin 8 travels along the cam surfaces pushing the cam collars (and therefore the cradle portions 5 'a, 5'b) in opposite directions thereby applying tension to the screen. In the tensioned condition the tensioning pins are in an over- centre cam position 9 (Fig. 7) to ensure that the cam system cannot lose tension due to vibration. The cam collars 6a, b and the tensioning pins 8 are hardened to minimise wear.
To release the tension the tensioning pin carrier 7 is again rotated by means of a spanner through 180 degrees returning the mechanism to the screen loading position, shown in Fig. 6.
Each cradle is fitted with three of these screen tensioning cam mechanisms.
Modifications and improvements can be incorporated without departing from the scope of the invention. Any feature of the invention described in this specification can be combined with any other feature described herein unless mutually exclusive. The reader is also referred to the priority document GB9723650.9 and to the abstract filed herewith which are incorporated by reference.

Claims

Claims: 1 A screen for use in screening cuttings from drilling fluid, the screen comprising a filter means, a support for the filter means and means for tensioning the filter means .
2 A screen as claimed in claim 1 wherein the filter means is bonded to the support .
3 A screen as claimed in any preceding claim, wherein two or more meshes are provided on the filter means .
4 A screen as claimed in claim 3, wherein a first mesh is tensioned to a greater extent than a second mesh.
5 A screen as claimed in claim 4, wherein the second mesh is substantially un-tensioned.
6 A screen as claimed in claim 5, wherein the first mesh overlies the second mesh.
7 A screen as claimed in any preceding claim wherein the filter means comprises one or more meshes encapsulated in a plastics coating.
8 A screen assembly comprising a screen as claimed in any preceding claim and a screen-carrying cradle to which the screen can be attached.
9 A screen assembly as claimed in claim 8, wherein the filtering screen is tensioned on the cradle.
10 A screen assembly as claimed in claim 9 wherein the tensioning means is adjustable after the screen has been attached to the cradle.
11 A screen assembly as claimed in any one of claims 8-10, wherein the tensioning means is disposed on the cradle.
12 A screen assembly as claimed in any of claims 8- 11, wherein the tensioning means comprises one or more rams which are operable to force apart two opposing parts of the cradle.
13 A screen assembly as claimed in claim 12, wherein the or each ram is hydraulic or pneumatic.
14 A screen assembly as claimed in claim 12, wherein the or each ram is actuated by hand.
15 A screen assembly as claimed in any one of claims 12-14, wherein the or each ram comprises one or more bolt stems upon which are located one or more nuts which can be driven along the stems against an opposing portion of the cradle.
16 A screen assembly as claimed in any one of claims 9-15, wherein the screen and carrying cradle are separable components.
17 A screen assembly as claimed in any one of claims 9-18, wherein the cradle is arched so that the screen conforms to the arch when attached thereto.
PCT/GB1998/003355 1997-11-10 1998-11-10 Screen for use in vibratory shaker device WO1999024144A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0009827A GB2346817B (en) 1997-11-10 1998-11-10 Screen for use in vibratory shaker device
NO20002402A NO20002402L (en) 1997-11-10 2000-05-09 Screen for use in vibration grating

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9723650.9 1997-11-10
GBGB9723650.9A GB9723650D0 (en) 1997-11-10 1997-11-10 Screen

Publications (1)

Publication Number Publication Date
WO1999024144A1 true WO1999024144A1 (en) 1999-05-20

Family

ID=10821799

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/003355 WO1999024144A1 (en) 1997-11-10 1998-11-10 Screen for use in vibratory shaker device

Country Status (3)

Country Link
GB (2) GB9723650D0 (en)
NO (1) NO20002402L (en)
WO (1) WO1999024144A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002005974A1 (en) * 2000-07-05 2002-01-24 M-I L.L.C. Vibratory screen
WO2004041406A1 (en) * 2002-11-02 2004-05-21 United Wire Ltd Woven wire cloth screen
US7682996B2 (en) 2002-11-21 2010-03-23 M-I L.L.C. Vibratory screen
CN105041244A (en) * 2015-07-22 2015-11-11 成都来宝石油设备有限公司 Mechanism for filtering petroleum drilling fluid
CN110871166A (en) * 2019-10-19 2020-03-10 安徽兰奇丝网织造有限公司 Screen cloth with straining device

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900628A (en) * 1973-06-13 1975-08-19 Linatex Corp Of America Pretensioned screen panel
US4457839A (en) * 1980-10-20 1984-07-03 Thule United Limited Vibratory screening apparatus
US4482455A (en) * 1981-10-16 1984-11-13 Humphrey Cecil T Dual frequency vibratory screen for classifying granular material
US4555330A (en) * 1983-08-29 1985-11-26 Midwestern Industries, Inc. Method and apparatus for separating material
EP0169698A2 (en) * 1984-07-21 1986-01-29 Thule United Limited Improvements in filtering screens
US4568455A (en) * 1983-07-01 1986-02-04 Sweco, Incorporated Screening device
US4634535A (en) * 1985-03-25 1987-01-06 Lott W Gerald Drilling mud cleaning method and apparatus
US4728422A (en) * 1984-07-21 1988-03-01 Thule United Limited Sifting frame assembly with differentially tensioned screens
US5108626A (en) * 1989-06-07 1992-04-28 Minpro Pty. Limited Process for recovering course particles from tailings
US5221008A (en) * 1990-05-11 1993-06-22 Derrick Manufacturing Corporation Vibratory screening machine and non-clogging wear-reducing screen assembly therefor
GB2264881A (en) * 1992-03-13 1993-09-15 Alfa Laval Separation Ab Mounting and tensioning arrangements for screens
GB2266475A (en) * 1992-04-21 1993-11-03 Alfa Laval Separation Ab Vibratory Screening Apparatus
US5385669A (en) * 1993-04-30 1995-01-31 Environmental Procedures, Inc. Mining screen device and grid structure therefor
EP0782887A2 (en) * 1994-03-03 1997-07-09 United Wire Limited Improved sifting screen
US5673797A (en) * 1995-03-29 1997-10-07 Derrick Manufacturing Corporation Screen assembly for vibratory screening machine and method of fabrication thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0843601A1 (en) * 1996-06-13 1998-05-27 ITS Holdings Limited Apparatus for attaching filter means to a frame

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900628A (en) * 1973-06-13 1975-08-19 Linatex Corp Of America Pretensioned screen panel
US4457839A (en) * 1980-10-20 1984-07-03 Thule United Limited Vibratory screening apparatus
US4482455A (en) * 1981-10-16 1984-11-13 Humphrey Cecil T Dual frequency vibratory screen for classifying granular material
US4568455A (en) * 1983-07-01 1986-02-04 Sweco, Incorporated Screening device
US4555330A (en) * 1983-08-29 1985-11-26 Midwestern Industries, Inc. Method and apparatus for separating material
US4728422A (en) * 1984-07-21 1988-03-01 Thule United Limited Sifting frame assembly with differentially tensioned screens
EP0169698A2 (en) * 1984-07-21 1986-01-29 Thule United Limited Improvements in filtering screens
US4634535A (en) * 1985-03-25 1987-01-06 Lott W Gerald Drilling mud cleaning method and apparatus
US5108626A (en) * 1989-06-07 1992-04-28 Minpro Pty. Limited Process for recovering course particles from tailings
US5221008A (en) * 1990-05-11 1993-06-22 Derrick Manufacturing Corporation Vibratory screening machine and non-clogging wear-reducing screen assembly therefor
GB2264881A (en) * 1992-03-13 1993-09-15 Alfa Laval Separation Ab Mounting and tensioning arrangements for screens
GB2266475A (en) * 1992-04-21 1993-11-03 Alfa Laval Separation Ab Vibratory Screening Apparatus
US5385669A (en) * 1993-04-30 1995-01-31 Environmental Procedures, Inc. Mining screen device and grid structure therefor
EP0782887A2 (en) * 1994-03-03 1997-07-09 United Wire Limited Improved sifting screen
US5673797A (en) * 1995-03-29 1997-10-07 Derrick Manufacturing Corporation Screen assembly for vibratory screening machine and method of fabrication thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002005974A1 (en) * 2000-07-05 2002-01-24 M-I L.L.C. Vibratory screen
US6431368B1 (en) 2000-07-05 2002-08-13 Emerson Electric Co. Vibratory screen
AU2001271857B2 (en) * 2000-07-05 2004-07-01 M-I L.L.C. Vibratory screen
WO2004041406A1 (en) * 2002-11-02 2004-05-21 United Wire Ltd Woven wire cloth screen
US7682996B2 (en) 2002-11-21 2010-03-23 M-I L.L.C. Vibratory screen
CN105041244A (en) * 2015-07-22 2015-11-11 成都来宝石油设备有限公司 Mechanism for filtering petroleum drilling fluid
CN110871166A (en) * 2019-10-19 2020-03-10 安徽兰奇丝网织造有限公司 Screen cloth with straining device
CN110871166B (en) * 2019-10-19 2021-04-23 安徽兰奇丝网织造有限公司 Screen cloth with straining device

Also Published As

Publication number Publication date
GB2346817B (en) 2002-03-20
GB9723650D0 (en) 1998-01-07
NO20002402D0 (en) 2000-05-09
GB0009827D0 (en) 2000-06-07
GB2346817A (en) 2000-08-23
NO20002402L (en) 2000-07-07

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