WO2010086670A1 - Filtration device - Google Patents

Filtration device Download PDF

Info

Publication number
WO2010086670A1
WO2010086670A1 PCT/GB2010/050149 GB2010050149W WO2010086670A1 WO 2010086670 A1 WO2010086670 A1 WO 2010086670A1 GB 2010050149 W GB2010050149 W GB 2010050149W WO 2010086670 A1 WO2010086670 A1 WO 2010086670A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
supporting structure
elastic member
deformation member
trommel
Prior art date
Application number
PCT/GB2010/050149
Other languages
French (fr)
Inventor
Andrew Baughan
Original Assignee
Andrew Baughan
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 Andrew Baughan filed Critical Andrew Baughan
Publication of WO2010086670A1 publication Critical patent/WO2010086670A1/en

Links

Classifications

    • 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
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/11—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for outward flow filtration
    • 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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
    • B03B5/56—Drum classifiers
    • 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
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/52—Regenerating the filter material in the filter by forces created by movement of the filter element
    • 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
    • B07B1/18—Drum screens
    • 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
    • B07B1/18—Drum screens
    • B07B1/22—Revolving drums
    • 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
    • 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
    • B07B1/50—Cleaning
    • 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
    • B07B1/50—Cleaning
    • B07B1/52—Cleaning with brushes or scrapers
    • 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
    • B07B1/50—Cleaning
    • B07B1/52—Cleaning with brushes or scrapers
    • B07B1/526—Cleaning with brushes or scrapers with scrapers

Definitions

  • This invention relates to a device for filtering objects by size, and in particular is concerned with rotary mesh filters.
  • waste or other products can be sorted by size. It is often useful to sort stone or ceramic rubble by size, so that it can be used as in building, for example as ballast or hardcore. Waste that has been consigned to skips can also usefully be sorted to reduce the amount that must be confined to a landfill, with a size based filter helping to separate biodegradable elements. Sorting by size can also be used to process sand or gravel, as well as lumber mill by-products, seeds and other organic products such as compost.
  • this invention provides a rotary mesh filter, part at least of whose mesh is inherently elastic.
  • This invention further provides a device for filtering objects by size.
  • the device comprises: (i) a supporting structure; (ii) a frame enclosing a space and attached to the supporting structure; and (iii) at least one elastic member provided with at least one hole, the elastic member being attached to the frame.
  • the frame is arranged so as to rotate with respect to the supporting structure, in use.
  • the invention provides a simple device for filtering objects placed within the frame. Sufficiently small objects will drop through the holes in the elastic member as the frame is rotated. Because the elastic member is elastic, it will deform under its own weight as the frame is rotated, allowing any objects caught within the elastic member to fall back into the frame. Therefore the system is self cleaning, avoiding the need for extensive and frequent maintenance when processing difficult objects such as wet organic materials.
  • the device can be adapted to process objects of any size and shape, simply by varying the size of the objects and the size of the holes in the elastic members.
  • Applications for the invention include the processing of sawdust, rubble, earth, domestic waste, compost, and any other objects that need to be sorted by size.
  • the supporting structure and the frame are typically formed primarily with steel, but any other suitably strong and stiff material can be used.
  • the device further comprises: (iv) a deformation member attached to the supporting structure, wherein the deformation member is arranged so as, in use, to deform the elastic member at a point which is substantially fixed with respect to the supporting structure. Therefore, as the frame is rotated, the elastic member is deformed by the deformation member. It may be that the deformation member is capable of bending so as to allow the frame to rotate.
  • the deformation member is formed from rubber, as this material can be both stiff enough to deform the elastic members and flexible enough to allow the smooth rotation of the frame. Furthermore, a deformation member formed from rubber does not have any sharp edges which may damage the elastic member. However, in alternative embodiments the deformation member may comprise metal, wood, or any other suitable material or combination of materials such as rubber adhered to a metal frame.
  • the deformation member is fixed rigidly with respect to the support structure, and arranged so as to apply pressure to that part of the elastic member on the outside of the frame.
  • This pressure causes the elastic member to temporarily deform, enlarging the size of the holes and allowing any objects trapped in the elastic member to fall out.
  • the deformation member is hingedly joined to the supporting structure. Where this is the case, typically part of the deformation member will rest upon that part of an elastic member to be deformed, in use. Therefore it is the weight of the deformation member that causes the elastic member to deform.
  • the frame is substantially prismatic; a polyhedron with two congruent polygonal faces and with all remaining faces parallelograms.
  • the device is a trommel, a revolving cylindrical sieve.
  • a prismatic frame is provided with a plurality of elastic members, each of which comprises a plurality of identically sized holes, and each of which can be replaced separately to aid in maintenance.
  • an elastic member comprises neoprene rubber. This material is used because neoprene is hard wearing, elastic and available cheaply. However, any sufficiently hard wearing and elastically deformable material can be used, including other forms of rubber.
  • Figure 1 is a diagram showing one embodiment of the invention in profile; and Figure 2 is a diagram showing the same embodiment of the invention from a different angle.
  • FIG. 1 and Figure 2 show a trommel 1 according to a first embodiment of the invention.
  • the trommel 1 is suitable for filtering compost.
  • the trommel 1 comprises a cylindrical frame 2 which is provided with ten neoprene screens 3.
  • the neoprene screens 3 comprise a mesh, a network of holes through which the smaller fragments of compost can pass.
  • the cylindrical frame 2 rests on two freely rotating wheels 4 and two drive wheels 5.
  • the drive wheels 5 are connected to a motor. When the motor is running, the drive wheels 5 rotate, which in turn causes the cylindrical frame to rotate.
  • compost is loaded into the cylindrical frame 2 of the trommel 1, and the cylindrical frame 2 is rotated. This motion keeps the compost turning over inside the trommel 1 , so that different fragments of compost are brought into contact with the neoprene screens 3. The smaller fragments can the fall through the mesh in the neoprene screens 3 into the container 6 placed below the trommel 1.
  • the trommel also comprises "flapper" 7, a stiff rubber member.
  • "flapper" 7 a stiff rubber member.
  • the neoprene screens 3 are brought into contact with the flapper 7, causing them to deform as shown in figure 1.
  • the flapper 7 As the neoprene screens 3 are stretched by the flapper 7, the holes in the mesh are enlarged, allowing compost that has become lodged in the mesh to fall out. Since the flapper 7 scrapes the outside of the neoprene screens 3 it also serves to directly push any fragments of compost that extend beyond the surface of the neoprene screen back through to the inside of the cylindrical frame 2.
  • the cylindrical frame 2 comprises ten beams 8 joining two circular end pieces 9.
  • the flapper 7 is flexible, so that as the cylindrical frame 2 rotates, the flapper 7 will bend out of the way to allow the beams 8 to pass.
  • the trommel 1 can be fitter with two plugs, fitted to the circular end pieces 9, which prevent the compost from falling out the ends of the trommel.
  • the trommel 1 stands on four legs 10, so that it can be elevated over the container 6. These legs 10 can be adjusted to raise and lower the trommel 1, and removed completely when the trommel 1 is being transported.
  • a trommel comprises a cylindrical frame and neoprene screens, but no flapper is provided. Instead, the neoprene screens deform under their own weight as the drum is rotated, causing the holes in the mesh of the neoprene screens to change shape, allowing objects caught in the mesh to escape.
  • a trommel comprises a cylindrical frame and neoprene screens, and a weighted member is hingedly joined to the trommel at the same location as the flapper 7 in the first embodiment shown in figures 1 and 2.
  • the weighted member rests upon the neoprene screens as they rotate, and the weight of the weighted member causes the neoprene screens to deform.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Fertilizers (AREA)

Abstract

Accordingly, this invention provides a device (1) for filtering objects by size. The device comprises: (i) a supporting structure; (ii) a frame (2) enclosing a space and attached to the supporting structure; and (iii) at least one elastic member (3) provided with at least one hole, the elastic member being attached to the frame. The frame is arranged so as to rotate with respect to the supporting structure, in use.

Description

ROTARY FILTER DRUM WITH FLOPPY, ELASTIC FILTER SCREEN
Field of the Invention
This invention relates to a device for filtering objects by size, and in particular is concerned with rotary mesh filters.
Background to the Invention
Many industrial and agricultural processes require waste or other products to be sorted by size. It is often useful to sort stone or ceramic rubble by size, so that it can be used as in building, for example as ballast or hardcore. Waste that has been consigned to skips can also usefully be sorted to reduce the amount that must be confined to a landfill, with a size based filter helping to separate biodegradable elements. Sorting by size can also be used to process sand or gravel, as well as lumber mill by-products, seeds and other organic products such as compost.
Various systems exist to sort inanimate objects by size, and they may depend upon some form of sieve, essentially pouring objects onto a network of holes and seeing which ones are small enough to fit through. For example, ore extracted by mining is often cleaned in a rotating barrel sieve, or trommel, with excess earth and other deposits being washed away through the holes of the trommel. This sort of system is dependable when the objects to be sorted are reliably discrete. However, when sorting objects that are capable of adhering to each other or the sieve, a system such as this will frequently become clogged. If the rubble to be sorted is wet, the smaller pieces of rubble and earth may form a mud which will block the sieve and make it impossible to continue until the machine has been cleaned at great expense of time and effort.
Therefore a system capable of sorting objects by size, but which was also capable of self cleaning and hence avoiding blockages, would be very desirable.
Summary of the Invention
Accordingly, this invention provides a rotary mesh filter, part at least of whose mesh is inherently elastic.
This invention further provides a device for filtering objects by size. The device comprises: (i) a supporting structure; (ii) a frame enclosing a space and attached to the supporting structure; and (iii) at least one elastic member provided with at least one hole, the elastic member being attached to the frame. The frame is arranged so as to rotate with respect to the supporting structure, in use.
In this way the invention provides a simple device for filtering objects placed within the frame. Sufficiently small objects will drop through the holes in the elastic member as the frame is rotated. Because the elastic member is elastic, it will deform under its own weight as the frame is rotated, allowing any objects caught within the elastic member to fall back into the frame. Therefore the system is self cleaning, avoiding the need for extensive and frequent maintenance when processing difficult objects such as wet organic materials.
The device can be adapted to process objects of any size and shape, simply by varying the size of the objects and the size of the holes in the elastic members. Applications for the invention include the processing of sawdust, rubble, earth, domestic waste, compost, and any other objects that need to be sorted by size. The supporting structure and the frame are typically formed primarily with steel, but any other suitably strong and stiff material can be used. It may be that the device further comprises: (iv) a deformation member attached to the supporting structure, wherein the deformation member is arranged so as, in use, to deform the elastic member at a point which is substantially fixed with respect to the supporting structure. Therefore, as the frame is rotated, the elastic member is deformed by the deformation member. It may be that the deformation member is capable of bending so as to allow the frame to rotate.
In a presently preferred embodiment, the deformation member is formed from rubber, as this material can be both stiff enough to deform the elastic members and flexible enough to allow the smooth rotation of the frame. Furthermore, a deformation member formed from rubber does not have any sharp edges which may damage the elastic member. However, in alternative embodiments the deformation member may comprise metal, wood, or any other suitable material or combination of materials such as rubber adhered to a metal frame.
Typically, the deformation member is fixed rigidly with respect to the support structure, and arranged so as to apply pressure to that part of the elastic member on the outside of the frame. This pressure causes the elastic member to temporarily deform, enlarging the size of the holes and allowing any objects trapped in the elastic member to fall out. It is advantageous to locate the deformation member near the top of the support structure, so that the objects falling from the deformed elastic member will fall back into the frame. Alternatively, it may be that the deformation member is hingedly joined to the supporting structure. Where this is the case, typically part of the deformation member will rest upon that part of an elastic member to be deformed, in use. Therefore it is the weight of the deformation member that causes the elastic member to deform.
It may be that the frame is substantially prismatic; a polyhedron with two congruent polygonal faces and with all remaining faces parallelograms. Typcially, the device is a trommel, a revolving cylindrical sieve.
It may be that at least one elastic member is substantially planar when not under tension. In the presently preferred embodiment, a prismatic frame is provided with a plurality of elastic members, each of which comprises a plurality of identically sized holes, and each of which can be replaced separately to aid in maintenance.
Typically an elastic member comprises neoprene rubber. This material is used because neoprene is hard wearing, elastic and available cheaply. However, any sufficiently hard wearing and elastically deformable material can be used, including other forms of rubber.
Brief Description of the Drawings
An embodiment of the invention will now be described, by way of example only, and with reference to the accompanying drawings, in which:
Figure 1 is a diagram showing one embodiment of the invention in profile; and Figure 2 is a diagram showing the same embodiment of the invention from a different angle.
Detailed Description of Exemplary Embodiments
Figure 1 and Figure 2 show a trommel 1 according to a first embodiment of the invention. The trommel 1 is suitable for filtering compost. The trommel 1 comprises a cylindrical frame 2 which is provided with ten neoprene screens 3. The neoprene screens 3 comprise a mesh, a network of holes through which the smaller fragments of compost can pass.
The cylindrical frame 2 rests on two freely rotating wheels 4 and two drive wheels 5. The drive wheels 5 are connected to a motor. When the motor is running, the drive wheels 5 rotate, which in turn causes the cylindrical frame to rotate. In use, compost is loaded into the cylindrical frame 2 of the trommel 1, and the cylindrical frame 2 is rotated. This motion keeps the compost turning over inside the trommel 1 , so that different fragments of compost are brought into contact with the neoprene screens 3. The smaller fragments can the fall through the mesh in the neoprene screens 3 into the container 6 placed below the trommel 1.
The trommel also comprises "flapper" 7, a stiff rubber member. As the cylindrical frame 2 is rotated, the neoprene screens 3 are brought into contact with the flapper 7, causing them to deform as shown in figure 1. As the neoprene screens 3 are stretched by the flapper 7, the holes in the mesh are enlarged, allowing compost that has become lodged in the mesh to fall out. Since the flapper 7 scrapes the outside of the neoprene screens 3 it also serves to directly push any fragments of compost that extend beyond the surface of the neoprene screen back through to the inside of the cylindrical frame 2.
The cylindrical frame 2 comprises ten beams 8 joining two circular end pieces 9. The flapper 7 is flexible, so that as the cylindrical frame 2 rotates, the flapper 7 will bend out of the way to allow the beams 8 to pass.
In use, the trommel 1 can be fitter with two plugs, fitted to the circular end pieces 9, which prevent the compost from falling out the ends of the trommel.
In use, the trommel 1 stands on four legs 10, so that it can be elevated over the container 6. These legs 10 can be adjusted to raise and lower the trommel 1, and removed completely when the trommel 1 is being transported.
In a second embodiment of the invention, a trommel comprises a cylindrical frame and neoprene screens, but no flapper is provided. Instead, the neoprene screens deform under their own weight as the drum is rotated, causing the holes in the mesh of the neoprene screens to change shape, allowing objects caught in the mesh to escape.
In a third embodiment of the invention, a trommel comprises a cylindrical frame and neoprene screens, and a weighted member is hingedly joined to the trommel at the same location as the flapper 7 in the first embodiment shown in figures 1 and 2. In use, the weighted member rests upon the neoprene screens as they rotate, and the weight of the weighted member causes the neoprene screens to deform.

Claims

Claims
1. A rotary mesh filter, part at least of whose mesh is inherently elastic.
2. A device according to claim 1, suitable for filtering objects by size, the device comprising:
(i) a supporting structure;
(ii) a frame enclosing a space and attached to the supporting structure; and (iii) at least one elastic member provided with at least one hole, the elastic member being attached to the frame, wherein the frame is arranged so as to rotate with respect to the supporting structure, in use.
3. A device as claimed in claim 2, wherein the device further comprises: (iv) a deformation member attached to the supporting structure, wherein the deformation member is arranged so as, in use, to deform the elastic member at a point which is substantially fixed with respect to the supporting structure.
4. A device as claimed in claim 3, wherein the deformation member is flexible and, in use, the deformation member bends as the frame rotates.
5. A device as claimed in claim 3 or claim 4, wherein the deformation member is hingedly joined to the supporting structure.
6. A device as claimed in claim 5, wherein part of the deformation member rests upon that part of an elastic member to be deformed, in use.
7. A device as claimed any preceding claim, wherein the frame is substantially prismatic.
8. A device as claimed in any preceding claim, wherein the device is a trommel.
9. A device as claimed in any preceding claim, wherein at least one elastic member is substantially planar when not under tension.
10. A device as claimed in any preceding claim, wherein the elastic member comprises a plurality of identically sized holes.
11. A device as claimed in any preceding claim, wherein the frame is driven, and the frame rests on the driving means.
12. A device substantially as hereinbefore described with reference to the Figures.
PCT/GB2010/050149 2009-02-02 2010-02-01 Filtration device WO2010086670A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0901613.0 2009-02-02
GB0901613A GB2467526A (en) 2009-02-02 2009-02-02 Flexible rotary mesh filter

Publications (1)

Publication Number Publication Date
WO2010086670A1 true WO2010086670A1 (en) 2010-08-05

Family

ID=40469393

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2010/050149 WO2010086670A1 (en) 2009-02-02 2010-02-01 Filtration device

Country Status (2)

Country Link
GB (1) GB2467526A (en)
WO (1) WO2010086670A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112317298A (en) * 2020-11-30 2021-02-05 中铁建大桥工程局集团第五工程有限公司 Sand and stone separation auxiliary device for bridge construction

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CN105234082B (en) * 2015-10-20 2017-05-03 广州恒驰建设工程有限公司 Sand grain screening system for construction site
CN107262359A (en) * 2017-08-17 2017-10-20 洛阳宇航重工科技股份有限公司 A kind of drum sieve with automatic regulating cleaner
CN108654977B (en) * 2018-05-03 2020-11-20 福州宇卓科技有限公司 Briquetting active carbon shaping material screening plant
CN110252450B (en) * 2019-07-31 2020-09-22 温州医科大学 Bow-pulling and arrow-shooting type traditional Chinese medicine crushing device
CN112473227A (en) * 2020-11-06 2021-03-12 常宁超喜欢食品有限公司 Brine quick separation device for processing marinated food
CN116492751B (en) * 2023-06-26 2023-08-25 陕西慧科植物开发有限公司 Plant extract prepares filter equipment

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US5139670A (en) * 1991-04-22 1992-08-18 Gene Hirs Rotating drum filter
EP0747136A1 (en) * 1995-06-07 1996-12-11 Technisches Büro für Maschinenbau Ing. Herbert Hausmann Drum screen
WO2000021638A1 (en) * 1998-10-14 2000-04-20 Gene Hirs Filter

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JPS6138670A (en) * 1984-07-30 1986-02-24 三ツ星ベルト株式会社 Manufacture of rubber screen
DE3722930A1 (en) * 1987-07-10 1989-01-19 Binder Co Ag Drum screen
SU1565548A1 (en) * 1988-04-25 1990-05-23 Харьковский Институт Механизации И Электрификации Сельского Хозяйства Cleaner of cylindrical sieve
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US5139670A (en) * 1991-04-22 1992-08-18 Gene Hirs Rotating drum filter
EP0747136A1 (en) * 1995-06-07 1996-12-11 Technisches Büro für Maschinenbau Ing. Herbert Hausmann Drum screen
WO2000021638A1 (en) * 1998-10-14 2000-04-20 Gene Hirs Filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112317298A (en) * 2020-11-30 2021-02-05 中铁建大桥工程局集团第五工程有限公司 Sand and stone separation auxiliary device for bridge construction

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Publication number Publication date
GB2467526A (en) 2010-08-04
GB0901613D0 (en) 2009-03-11

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