CA2196443A1 - Liquids extractor - Google Patents
Liquids extractorInfo
- Publication number
- CA2196443A1 CA2196443A1 CA002196443A CA2196443A CA2196443A1 CA 2196443 A1 CA2196443 A1 CA 2196443A1 CA 002196443 A CA002196443 A CA 002196443A CA 2196443 A CA2196443 A CA 2196443A CA 2196443 A1 CA2196443 A1 CA 2196443A1
- Authority
- CA
- Canada
- Prior art keywords
- cylindrical shell
- openings
- draining roll
- drum
- hollow cylindrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 54
- 239000000835 fiber Substances 0.000 claims abstract description 32
- 238000009827 uniform distribution Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 210000003608 fece Anatomy 0.000 abstract description 13
- 239000010871 livestock manure Substances 0.000 abstract description 13
- 241001465754 Metazoa Species 0.000 description 5
- 238000000926 separation method Methods 0.000 description 2
- 241000283690 Bos taurus Species 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F3/00—Fertilisers from human or animal excrements, e.g. manure
- C05F3/06—Apparatus for the manufacture
-
- 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
- B01D33/067—Construction of the filtering drums, e.g. mounting or sealing arrangements
-
- 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
- B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
-
- 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
- B01D33/35—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition
- B01D33/37—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition in parallel connection
-
- 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
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
- B01D33/64—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression
- B01D33/646—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression by pressure rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/20—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using rotary pressing members, other than worms or screws, e.g. rollers, rings, discs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/145—Feedstock the feedstock being materials of biological origin
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Fiber Materials (AREA)
- Paper (AREA)
Abstract
An apparatus for extracting liquids from an aggregate formed of liquids and fibers, like from diluted manure or from paper mills residue. The apparatus has a rotatable drum covered with a resilient layer. The apparatus also has at least one draining roll which is pressed against the drum so that the aggregate passing in between is squeezed. Each roll has a shaft and at least two supporting discs fixed onto the shaft. The supporting discs have holes to let the collected liquids flow sideways. Each roll also has a hollow cylindrical shell. The shell is coaxial with the shaft and has a uniform distribution of openings. Each roll also has a perforated filter screen fixed against and around its outside surface. The screen has perforations evenly distributed so that only some perforations lie over openings in the shell. The perforations are smaller in size than the openings. The apparatus also has hoppers to collect liquids and wipers set against a lower part of each draining roll close to the nip in order to wipe the fibers off their screen. When the apparatus has several rolls, the openings in the lower rolls are smaller than in the upper rolls.
Description
21 ~64 43 BACRGROUND OF THE l~v~..lON
a) Fiold of the invention The present invention is concerned with a machine for use to extract liquids from an aggregate formed of liquids and fibers.
b) Brief description of prior art In the stock-farming industry, it is of common practice to recycle dry farm animal manure as a compost and, if sufficiently dry, as a litter or green bedding for stock animals. Even when simply stored in large ponds, it is highly desirable to separate the flbers in order to reduce thick crust build-up over the ponds and thus facilitate agitation and increase storage capacity.
To achieve such a separation, it is of common practice to dilute the manure in water and then let it slide down by gravity along a screen. The liquids and very fine sediments pass through the screen and are collected under the same while the remaining portion of the manure containing the fibers is collected at the bottom of the screen and then used as such or processed through a liquid extractor.
Such a liquid extractor preferably consists of a "wringing machine" having a main roller and one or more auxiliary rollers whose external surfaces consist of a thin screen with perforations small enough to prevent fibers from passing through. The main and auxiliary rollers are mounted so that the manure is squeezed between the main roller and each auxiliary roller consecutively. The dry manure fibers are collected at the bottom of the machine while the liquids extracted by the squeezing are collected within the auxiliary rollers and drained out of the same through conduits. So far, the auxiliary rollers used are commonly made of a thin screen mounted on disks themselves mounted on a shaft. These disks ' 21 96443 have openings to let the collected liquids move toward a conduit located on one or both sides of the auxiliary rollers.
A main problem with the existing "wringing machine"
is that, because of the structure of the auxiliary rollers of the existing machine, it is impossible to apply a sufficient pressure onto the same without risking to deform and/or even damage the thin screens that are held only by the peripheries of the supporting discs.
Another problem with the existing machine is that the overall separation performance is reduced due to a "rewetting"
of the dry manure fibers which occurs when the fibers which have just been squeezed act as a sponge and reabsorb liquid through the perforations of the screens of the auxiliary rollers which, as aforesaid, are very thin.
8UMMARY OF THE lNv~lON
The object of the present invention is to provide an apparatus for extracting liquids from an aggregate formed of liquids and fibers.
More particularly, the object of the invention is provide an apparatus for extracting liquids from an aggregate, preferably but not exclusively consisting of wet fibers from diluted farm animal manure, which apparatus is so devised as to reduce as much as possible rewetting of the fibers once dried.
In accordance with the invention, this object is achieved by an apparatus for extracting liquids from an aggregate formed of liquids and fibers.
This apparatus comprises a rotatable drum having a main longitudinal axis and an outer surface covered with a resilient layer.
The apparatus also comprises a first draining roll which has a first axis parallel to the main axis of the drum.
The first draining roll is pressed against the drum in order to define a first nip therewith in which the aggregate passes and is squeezed. The first draining roll comprises a first shaft which extends along the first axis and at least two first supporting members fixed transversely onto the first shaft. The first supporting members have first holes in the direction of the first axis. The first draining roll also comprises a first hollow cylindrical shell which has a thick wall defined by an outside surface and an inside surface. The first hollow cylindrical shell is coaxial with the first shaft and is supported by the first supporting members. The first hollow cylindrical shell have a substantially uniform distribution of first openings that extend radially with respect to the first axis. Therefore, the first shell has a reduced opened surface which allows the fibers to be fully pressed in the regions of the shell without openings and which completely eliminates rewetting in those same regions.
The first draining roll further comprises a first perforated filter screen fixed against and around the outside surface of the first cylindrical shell. The first perforated filter screen has first perforations evenly distributed so that some first perforations lie over first openings in the first hollow cylindrical shell while other first perforations lie over part of the first hollow cylindrical shell without first openings. The first perforations are smaller in size than the first openings and the size is chosen so that the fibers to be pressed do not pass through the perforations.
As the first filter screen is fully supported by the first cylindrical shell except over the first openings thereof, a sufficient pressure can be exerted onto the first draining roll to squeeze the liquids out of the aggregate without risking to damage the first filter system. Moreover, since the opened surface area leading within the first shell is substantially reduced by the not-opened surface of the first shell, the percentage of rewetting is substantially reduced as compared to a thin screen alone standing in between the collected liquids and the fibers.
The apparatus according to the invention further comprises first liquid collection means to collect and guide - ' 2 1 96443 liquids which are pressured through the first perforated filter screen and into the first cylindrical shell as well as liquids dropping down from the first perforated filter screen.
The apparatus further comprises first wiping means mounted in a stationary position in between the drum and the first collection means. The first wiping means are set against a lower part of the first draining roll close to the nip inside to wipe the fibers off the first perforated filter screen.
In accordance with a first preferred embodiment of the invention, the apparatus may further comprise a second draining roll having a second axis parallel to the main axis of the drum. The second draining roll is pressed against the drum in a position lower than the first draining roll in order to define a second nip therewith in which the aggregate passes and is squeezed. The second draining roll is similar to the first draining roll except that it has second openings which are smaller in size than the first openings of the first draining roll. In this first preferred embodiment, the apparatus also has second liquid collection means and second wiping means.
In accordance with a second preferred embodiment of the invention, the apparatus may further comprise a third draining roll having a third axis parallel to the main axis of the drum. The third draining roll is pressed against the drum in a position lower than the second draining roll in order to define a third nip therewith in which the aggregate passes and is squeezed. The third draining roll is similar to the second draining roll except that it has third openings which are smaller in size than the second openings of the second draining roll. In this second preferred embodiment, the apparatus also has third liquid collection means and third wiping means.
Thus, the invention provides an apparatus for extracting liquids from an aggregate formed of liquids and fibers, which, thanks to its structure, substantially reduces rewetting of the fibers once dried.
The apparatus according to the invention can be used to extract liquids from any kind of aggregate formed of liquids and fibers. However, it is preferably used to process farm animal manure, and more particularly, bovine manure.
BRIEF DE8CRIPTION OF THE DRAWING~
A non restrictive description of a preferred embodiment of the present invention will be given hereinafter with references to the appended drawings in which:
FIG. 1 is a schematic of a side elevation view of an apparatus according to the present invention for extracting liquids; and FIG. 2 is a partial front elevation view of the draining rolls shown in FIG. 1.
FIG. 1 illustrates an apparatus 8 according to the present invention for extracting liquids from an aggregate "A"
formed of liquids and fibers. This aggregate is preferably obtained from diluted manure.
As is shown, the apparatus 8 comprises a rotatable drum 12 which has a shaft 14 having a main longitudinal axis and an outer surface covered with a layer 10 of resilient material, such as rubber. Preferably, the apparatus 8 comprises driving means 5~ to controllably rotate the drum 12.
The apparatus also comprises a first draining roll 16 which has a first axis parallel to the main axis of the drum 12. The first draining roll 16 is pressed against the drum 12 in order to define a first nip therewith in which the aggregate "A" may pass in the direction shown with the arrow and be squeezed.
First pressure means 21 are used to apply a first pressure on the first shaft 20 of the first draining roll 16 in order to press it against the drum 12.
The first draining roll 16 comprises a first shaft 20 extending along the first axis and at least two first " 21 96~43 supporting members 18 fixed transversely onto the first shaft 20. The first supporting members 18 have first holes 22 in the direction of the first axis.
Referring now also to FIG. 2, the first draining roll 16 also comprises a first hollow cylindrical shell 64 which has a thick wall defined by an outside surface and an inside surface. The first hollow cylindrical shell 64 is coaxial with the first shaft 20 and is supported by the first supporting members 18. The first hollow cylindrical shell 64 has a substantially uniform distribution of first openings 66 that extend radially with respect to the first axis. Preferably, the surface ratio of the first openings 66 to the outside surface of the first hollow cylindrical shell 64 ranges between 30 and 50% .
The first draining roll 16 further comprises a first perforated filter screen 60, preferably made of steel, fixed against and around the outside surface. The first perforated filter screen 60 has first perforations 62 evenly distributed so that some first perforations 62 lie over first openings 66 in the first hollow cylindrical shell 64 while other first perforations 62 lie over part of the first hollow cylindrical shell 64 without first openings 66. The first perforations 62 are smaller in size than the first openings 66. Preferably, the first perforations 62 of the first screen laying over the first hollow cylindrical shell 64 represent 20 and 40% of the surface area of this first screen.
As the reduced opened surface of the first draining roll 16 reduces the surface through which rewetting can occur, rewetting of the dry fibers is substantially reduced.
Moreover, as the hollow cylindrical shell 64 wall is much thicker than the first perforated filter screen 60 and thus much stronger, a greater pressure can be applied onto first draining roll, as compared to the one that can be applied to a thin screen 60 alone standing. As a result, a better squeezing is achieved.
Furthermore, using a hollow cylindrical shell 64 with a thick wall, permits to use standard thin screens 60 which are commercially available and easy to replace. Using such thin screens 60 also lower the initial and replacement costs.
Since, the perforated filter screen 60 covers all the outside surface, it has a gripping effect on the fibers and reduces lateral leaking of the fibers toward the end of the draining rolls 16, thereby increasing the whole apparatus efficiency.
The apparatus 8 also comprises first liquid collection means 24 to collect and guide the liquids which have been pressed out of the manure through the first perforated filter screen 60 into the first cylindrical shell 64 as well as the liquids dropping down from the first perforated filter screen 60.
First wiping means 26 are mounted in a stationary position in between the drum 12 and the first collection means 24, close to the first nip. The first wiping means 26 are set against a lower part of the first draining roll 16 close to the nip in order to wipe the fibers off the first perforated filter screen 60.
The apparatus 8 according to the preferred embodiment of the invention, as shown in the accompanying drawings, also comprises a second draining roll 30 which has a second axis parallel to the main axis of the drum 12. The second draining roll 30 is pressed against the drum 12 in a position lower than the first draining roll 30 in order to define a second nip therewith in which the aggregate that has just been squeezed by the drum and the first draining roll may pass and be squeezed.
Second pressure means 35 are provided to apply a second pressure on the second shaft 3~, of the second draining roll 30 in order to press it against the drum 12. Preferably, the second pressure is selected so as to be greater than the first pressure.
The second draining roll 30 comprises a second shaft 34 which extend along the second axis and at least two second supporting members 32 fixed transversely onto the second shaft 34. The second supporting members 32 have second holes 36 in the direction of the second axis.
The second draining roll 30 also comprises a second hollow cylindrical shell 72 which has a thick wall defined by an outside surface and an inside surface. The second hollow cylindrical shell 72 is coaxial with the second shaft 34 and is supported by the second supporting members 32. The second hollow cylindrical shell 72 has a substantially uniform distribution of second openings 74 which extend radially with respect to the second axis. The second openings 74 are smaller in size than the first openings 66 of the first draining roll 16. Preferably, the surface ratio of the second openings 74 to the outside surface of the second hollow cylindrical shell 72 ranges between 10 and 30%.
The second draining roll 30 also has a second perforated filter screen 68, preferably made of steel, fixed against and around the outside surface. The second perforated filter screen 68 has second perforations 70 evenly distributed so that some second perforations 70 lie over second openings 74 in the second hollow cylindrical shell 72 while other second perforations 70 lie over part of the second hollow cylindrical shell 72 without second openings 74. The second perforations 70 have substantially the same size as the first perforations 62 of the first filter screen 60. Preferably, the second perforations 70 of the second screen laying over the second hollow cylindrical shell 72 represent 20 and 40% of the surface area of the second screen.
Using a second draining roll 30 with a smaller opened surface than the first draining roll 16 permit to apply a higher pressure to the second draining roll 30 which, thanks to its smaller opened surface, is structurally stronger and can withstand higher pressure. Such a higher pressure is necessary to compress the fibers further and extract more of the remaining liquids. The reduced opened surface of the second draining roll 30 also reduces the surface through which rewetting can occur, thereby reducing rewetting further.
''' 21 96443 -Of course, second liquid collection means 38 are provided to collect and guide the liquids which are being pressed through the second perforated filter screen 68 into the second cylindrical shell 72 as well as liquids dropping down from the second perforated filter screen 68. The apparatus also comprises second wiping means 40 mounted in a stationary position in between the drum 12 and the second collection means 38. The second wiping means 40 are set against a lower part of the second draining roll 30 close to the second nip in order lo to wipe the fibers off the second perforated filter screen 68.
As shown, the apparatus 8 according to the preferred embodiment of the invention, may further comprise a third draining roll 42 which has a third axis parallel to the main axis of the drum 12. The third draining roll ~2 is pressed against the drum 12 in a position lower than the second draining roll 30 in order to define a third nip therewith in which the aggregate may pass and be squeezed.
Third pressure means 47 are provided to apply a third pressure on the third shaft 52 of the third draining roll 42 in order to press it against the drum. Preferably, the third pressure is selected to as to be greater than the second pressure.
The third draining roll 42 comprises a third shaft 52 which extend along the third axis and at least two third supporting members 44 fixed transversely onto the third shaft 52. The third supporting members 44 have third holes 46 in the direction of the third axis.
The third draining roll 42 also comprises a third hollow cylindrical shell 80 which has a thick wall defined by an outside surface and an inside surface. The third hollow cylindrical shell 80 iS coaxial with the third shaft 52 and is supported by the third supporting members 44. The third hollow cylindrical shell 44 has a substantially uniform distribution of third openings 82 which extend radially with respect to the third axis. The third openings 82 are smaller in size than the second openings 74 of the second draining roll 30. Preferably, the surface ratio of the third openings 82 to the outside 21 q6443 surface of the third hollow cylindrical shell 80 ranges between 5 and 10%. The further reduced opened surface of the third draining roll 30 further reduces the surface through which rewetting can occur, thereby reducing rewetting even more.
A greater pressure can be applied on the third roll 42 than on the second roll 30 since it has a smaller opened surface and is thus structurally stronger and can withstand a higher pressure. Such a higher pressure is useful to compress the fibers further and extract more of the remaining liquids.
The third draining roll 42 also comprises a third perforated filter screen 76, preferably made of steel, fixed against and around the outside surface. The third perforated filter screen 76 has third perforations 78 evenly distributed so that some third perforations 78 lie over third openings 82 in the third hollow cylindrical shell 80 while other third perforations 78 lie over part of the third hollow cylindrical shell 80 without third openings 82. The third perforations 78 have substantially the same size as the first and second perforations 62, 70 of the first and second filter screen 60, 68. Thus, preferably, the third perforations 78 of the third screen laying over the third hollow cylindrical shell 80 represent 20 and 40% of the surface area of this third screen.
Of course, third liquid collection means 48 are also provided to collect and guide liquids which are being pressured through the third perforated filter screen 76 and then into the third cylindrical shell 80 as well as liquids dropping down from the third perforated filter screen 76.
Third wiping means 50 are also mounted in a stationary position in between the drum 12 and the third collection means 48. The third wiping means 50 are set against a lower part of the third draining roll 42 near the third nip in order to wipe the fibers off the third perforated filter screen 76.
Although preferred embodiments of the invention have been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the invention is not limited to these precise embodiments and that various changes and modifications may be made therein without departing from the scope and spirit of the invention.
For example, although the aggregate has been referred to as being preferably farm animal manure, it could very well be from other sources such as paper mills residues.
a) Fiold of the invention The present invention is concerned with a machine for use to extract liquids from an aggregate formed of liquids and fibers.
b) Brief description of prior art In the stock-farming industry, it is of common practice to recycle dry farm animal manure as a compost and, if sufficiently dry, as a litter or green bedding for stock animals. Even when simply stored in large ponds, it is highly desirable to separate the flbers in order to reduce thick crust build-up over the ponds and thus facilitate agitation and increase storage capacity.
To achieve such a separation, it is of common practice to dilute the manure in water and then let it slide down by gravity along a screen. The liquids and very fine sediments pass through the screen and are collected under the same while the remaining portion of the manure containing the fibers is collected at the bottom of the screen and then used as such or processed through a liquid extractor.
Such a liquid extractor preferably consists of a "wringing machine" having a main roller and one or more auxiliary rollers whose external surfaces consist of a thin screen with perforations small enough to prevent fibers from passing through. The main and auxiliary rollers are mounted so that the manure is squeezed between the main roller and each auxiliary roller consecutively. The dry manure fibers are collected at the bottom of the machine while the liquids extracted by the squeezing are collected within the auxiliary rollers and drained out of the same through conduits. So far, the auxiliary rollers used are commonly made of a thin screen mounted on disks themselves mounted on a shaft. These disks ' 21 96443 have openings to let the collected liquids move toward a conduit located on one or both sides of the auxiliary rollers.
A main problem with the existing "wringing machine"
is that, because of the structure of the auxiliary rollers of the existing machine, it is impossible to apply a sufficient pressure onto the same without risking to deform and/or even damage the thin screens that are held only by the peripheries of the supporting discs.
Another problem with the existing machine is that the overall separation performance is reduced due to a "rewetting"
of the dry manure fibers which occurs when the fibers which have just been squeezed act as a sponge and reabsorb liquid through the perforations of the screens of the auxiliary rollers which, as aforesaid, are very thin.
8UMMARY OF THE lNv~lON
The object of the present invention is to provide an apparatus for extracting liquids from an aggregate formed of liquids and fibers.
More particularly, the object of the invention is provide an apparatus for extracting liquids from an aggregate, preferably but not exclusively consisting of wet fibers from diluted farm animal manure, which apparatus is so devised as to reduce as much as possible rewetting of the fibers once dried.
In accordance with the invention, this object is achieved by an apparatus for extracting liquids from an aggregate formed of liquids and fibers.
This apparatus comprises a rotatable drum having a main longitudinal axis and an outer surface covered with a resilient layer.
The apparatus also comprises a first draining roll which has a first axis parallel to the main axis of the drum.
The first draining roll is pressed against the drum in order to define a first nip therewith in which the aggregate passes and is squeezed. The first draining roll comprises a first shaft which extends along the first axis and at least two first supporting members fixed transversely onto the first shaft. The first supporting members have first holes in the direction of the first axis. The first draining roll also comprises a first hollow cylindrical shell which has a thick wall defined by an outside surface and an inside surface. The first hollow cylindrical shell is coaxial with the first shaft and is supported by the first supporting members. The first hollow cylindrical shell have a substantially uniform distribution of first openings that extend radially with respect to the first axis. Therefore, the first shell has a reduced opened surface which allows the fibers to be fully pressed in the regions of the shell without openings and which completely eliminates rewetting in those same regions.
The first draining roll further comprises a first perforated filter screen fixed against and around the outside surface of the first cylindrical shell. The first perforated filter screen has first perforations evenly distributed so that some first perforations lie over first openings in the first hollow cylindrical shell while other first perforations lie over part of the first hollow cylindrical shell without first openings. The first perforations are smaller in size than the first openings and the size is chosen so that the fibers to be pressed do not pass through the perforations.
As the first filter screen is fully supported by the first cylindrical shell except over the first openings thereof, a sufficient pressure can be exerted onto the first draining roll to squeeze the liquids out of the aggregate without risking to damage the first filter system. Moreover, since the opened surface area leading within the first shell is substantially reduced by the not-opened surface of the first shell, the percentage of rewetting is substantially reduced as compared to a thin screen alone standing in between the collected liquids and the fibers.
The apparatus according to the invention further comprises first liquid collection means to collect and guide - ' 2 1 96443 liquids which are pressured through the first perforated filter screen and into the first cylindrical shell as well as liquids dropping down from the first perforated filter screen.
The apparatus further comprises first wiping means mounted in a stationary position in between the drum and the first collection means. The first wiping means are set against a lower part of the first draining roll close to the nip inside to wipe the fibers off the first perforated filter screen.
In accordance with a first preferred embodiment of the invention, the apparatus may further comprise a second draining roll having a second axis parallel to the main axis of the drum. The second draining roll is pressed against the drum in a position lower than the first draining roll in order to define a second nip therewith in which the aggregate passes and is squeezed. The second draining roll is similar to the first draining roll except that it has second openings which are smaller in size than the first openings of the first draining roll. In this first preferred embodiment, the apparatus also has second liquid collection means and second wiping means.
In accordance with a second preferred embodiment of the invention, the apparatus may further comprise a third draining roll having a third axis parallel to the main axis of the drum. The third draining roll is pressed against the drum in a position lower than the second draining roll in order to define a third nip therewith in which the aggregate passes and is squeezed. The third draining roll is similar to the second draining roll except that it has third openings which are smaller in size than the second openings of the second draining roll. In this second preferred embodiment, the apparatus also has third liquid collection means and third wiping means.
Thus, the invention provides an apparatus for extracting liquids from an aggregate formed of liquids and fibers, which, thanks to its structure, substantially reduces rewetting of the fibers once dried.
The apparatus according to the invention can be used to extract liquids from any kind of aggregate formed of liquids and fibers. However, it is preferably used to process farm animal manure, and more particularly, bovine manure.
BRIEF DE8CRIPTION OF THE DRAWING~
A non restrictive description of a preferred embodiment of the present invention will be given hereinafter with references to the appended drawings in which:
FIG. 1 is a schematic of a side elevation view of an apparatus according to the present invention for extracting liquids; and FIG. 2 is a partial front elevation view of the draining rolls shown in FIG. 1.
FIG. 1 illustrates an apparatus 8 according to the present invention for extracting liquids from an aggregate "A"
formed of liquids and fibers. This aggregate is preferably obtained from diluted manure.
As is shown, the apparatus 8 comprises a rotatable drum 12 which has a shaft 14 having a main longitudinal axis and an outer surface covered with a layer 10 of resilient material, such as rubber. Preferably, the apparatus 8 comprises driving means 5~ to controllably rotate the drum 12.
The apparatus also comprises a first draining roll 16 which has a first axis parallel to the main axis of the drum 12. The first draining roll 16 is pressed against the drum 12 in order to define a first nip therewith in which the aggregate "A" may pass in the direction shown with the arrow and be squeezed.
First pressure means 21 are used to apply a first pressure on the first shaft 20 of the first draining roll 16 in order to press it against the drum 12.
The first draining roll 16 comprises a first shaft 20 extending along the first axis and at least two first " 21 96~43 supporting members 18 fixed transversely onto the first shaft 20. The first supporting members 18 have first holes 22 in the direction of the first axis.
Referring now also to FIG. 2, the first draining roll 16 also comprises a first hollow cylindrical shell 64 which has a thick wall defined by an outside surface and an inside surface. The first hollow cylindrical shell 64 is coaxial with the first shaft 20 and is supported by the first supporting members 18. The first hollow cylindrical shell 64 has a substantially uniform distribution of first openings 66 that extend radially with respect to the first axis. Preferably, the surface ratio of the first openings 66 to the outside surface of the first hollow cylindrical shell 64 ranges between 30 and 50% .
The first draining roll 16 further comprises a first perforated filter screen 60, preferably made of steel, fixed against and around the outside surface. The first perforated filter screen 60 has first perforations 62 evenly distributed so that some first perforations 62 lie over first openings 66 in the first hollow cylindrical shell 64 while other first perforations 62 lie over part of the first hollow cylindrical shell 64 without first openings 66. The first perforations 62 are smaller in size than the first openings 66. Preferably, the first perforations 62 of the first screen laying over the first hollow cylindrical shell 64 represent 20 and 40% of the surface area of this first screen.
As the reduced opened surface of the first draining roll 16 reduces the surface through which rewetting can occur, rewetting of the dry fibers is substantially reduced.
Moreover, as the hollow cylindrical shell 64 wall is much thicker than the first perforated filter screen 60 and thus much stronger, a greater pressure can be applied onto first draining roll, as compared to the one that can be applied to a thin screen 60 alone standing. As a result, a better squeezing is achieved.
Furthermore, using a hollow cylindrical shell 64 with a thick wall, permits to use standard thin screens 60 which are commercially available and easy to replace. Using such thin screens 60 also lower the initial and replacement costs.
Since, the perforated filter screen 60 covers all the outside surface, it has a gripping effect on the fibers and reduces lateral leaking of the fibers toward the end of the draining rolls 16, thereby increasing the whole apparatus efficiency.
The apparatus 8 also comprises first liquid collection means 24 to collect and guide the liquids which have been pressed out of the manure through the first perforated filter screen 60 into the first cylindrical shell 64 as well as the liquids dropping down from the first perforated filter screen 60.
First wiping means 26 are mounted in a stationary position in between the drum 12 and the first collection means 24, close to the first nip. The first wiping means 26 are set against a lower part of the first draining roll 16 close to the nip in order to wipe the fibers off the first perforated filter screen 60.
The apparatus 8 according to the preferred embodiment of the invention, as shown in the accompanying drawings, also comprises a second draining roll 30 which has a second axis parallel to the main axis of the drum 12. The second draining roll 30 is pressed against the drum 12 in a position lower than the first draining roll 30 in order to define a second nip therewith in which the aggregate that has just been squeezed by the drum and the first draining roll may pass and be squeezed.
Second pressure means 35 are provided to apply a second pressure on the second shaft 3~, of the second draining roll 30 in order to press it against the drum 12. Preferably, the second pressure is selected so as to be greater than the first pressure.
The second draining roll 30 comprises a second shaft 34 which extend along the second axis and at least two second supporting members 32 fixed transversely onto the second shaft 34. The second supporting members 32 have second holes 36 in the direction of the second axis.
The second draining roll 30 also comprises a second hollow cylindrical shell 72 which has a thick wall defined by an outside surface and an inside surface. The second hollow cylindrical shell 72 is coaxial with the second shaft 34 and is supported by the second supporting members 32. The second hollow cylindrical shell 72 has a substantially uniform distribution of second openings 74 which extend radially with respect to the second axis. The second openings 74 are smaller in size than the first openings 66 of the first draining roll 16. Preferably, the surface ratio of the second openings 74 to the outside surface of the second hollow cylindrical shell 72 ranges between 10 and 30%.
The second draining roll 30 also has a second perforated filter screen 68, preferably made of steel, fixed against and around the outside surface. The second perforated filter screen 68 has second perforations 70 evenly distributed so that some second perforations 70 lie over second openings 74 in the second hollow cylindrical shell 72 while other second perforations 70 lie over part of the second hollow cylindrical shell 72 without second openings 74. The second perforations 70 have substantially the same size as the first perforations 62 of the first filter screen 60. Preferably, the second perforations 70 of the second screen laying over the second hollow cylindrical shell 72 represent 20 and 40% of the surface area of the second screen.
Using a second draining roll 30 with a smaller opened surface than the first draining roll 16 permit to apply a higher pressure to the second draining roll 30 which, thanks to its smaller opened surface, is structurally stronger and can withstand higher pressure. Such a higher pressure is necessary to compress the fibers further and extract more of the remaining liquids. The reduced opened surface of the second draining roll 30 also reduces the surface through which rewetting can occur, thereby reducing rewetting further.
''' 21 96443 -Of course, second liquid collection means 38 are provided to collect and guide the liquids which are being pressed through the second perforated filter screen 68 into the second cylindrical shell 72 as well as liquids dropping down from the second perforated filter screen 68. The apparatus also comprises second wiping means 40 mounted in a stationary position in between the drum 12 and the second collection means 38. The second wiping means 40 are set against a lower part of the second draining roll 30 close to the second nip in order lo to wipe the fibers off the second perforated filter screen 68.
As shown, the apparatus 8 according to the preferred embodiment of the invention, may further comprise a third draining roll 42 which has a third axis parallel to the main axis of the drum 12. The third draining roll ~2 is pressed against the drum 12 in a position lower than the second draining roll 30 in order to define a third nip therewith in which the aggregate may pass and be squeezed.
Third pressure means 47 are provided to apply a third pressure on the third shaft 52 of the third draining roll 42 in order to press it against the drum. Preferably, the third pressure is selected to as to be greater than the second pressure.
The third draining roll 42 comprises a third shaft 52 which extend along the third axis and at least two third supporting members 44 fixed transversely onto the third shaft 52. The third supporting members 44 have third holes 46 in the direction of the third axis.
The third draining roll 42 also comprises a third hollow cylindrical shell 80 which has a thick wall defined by an outside surface and an inside surface. The third hollow cylindrical shell 80 iS coaxial with the third shaft 52 and is supported by the third supporting members 44. The third hollow cylindrical shell 44 has a substantially uniform distribution of third openings 82 which extend radially with respect to the third axis. The third openings 82 are smaller in size than the second openings 74 of the second draining roll 30. Preferably, the surface ratio of the third openings 82 to the outside 21 q6443 surface of the third hollow cylindrical shell 80 ranges between 5 and 10%. The further reduced opened surface of the third draining roll 30 further reduces the surface through which rewetting can occur, thereby reducing rewetting even more.
A greater pressure can be applied on the third roll 42 than on the second roll 30 since it has a smaller opened surface and is thus structurally stronger and can withstand a higher pressure. Such a higher pressure is useful to compress the fibers further and extract more of the remaining liquids.
The third draining roll 42 also comprises a third perforated filter screen 76, preferably made of steel, fixed against and around the outside surface. The third perforated filter screen 76 has third perforations 78 evenly distributed so that some third perforations 78 lie over third openings 82 in the third hollow cylindrical shell 80 while other third perforations 78 lie over part of the third hollow cylindrical shell 80 without third openings 82. The third perforations 78 have substantially the same size as the first and second perforations 62, 70 of the first and second filter screen 60, 68. Thus, preferably, the third perforations 78 of the third screen laying over the third hollow cylindrical shell 80 represent 20 and 40% of the surface area of this third screen.
Of course, third liquid collection means 48 are also provided to collect and guide liquids which are being pressured through the third perforated filter screen 76 and then into the third cylindrical shell 80 as well as liquids dropping down from the third perforated filter screen 76.
Third wiping means 50 are also mounted in a stationary position in between the drum 12 and the third collection means 48. The third wiping means 50 are set against a lower part of the third draining roll 42 near the third nip in order to wipe the fibers off the third perforated filter screen 76.
Although preferred embodiments of the invention have been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the invention is not limited to these precise embodiments and that various changes and modifications may be made therein without departing from the scope and spirit of the invention.
For example, although the aggregate has been referred to as being preferably farm animal manure, it could very well be from other sources such as paper mills residues.
Claims (20)
1. An apparatus for extracting liquids from an aggregate formed of liquids and fibers, the apparatus comprising:
a rotatable drum having a main longitudinal axis and an outer surface covered with a resilient layer;
a first draining roll having a first axis parallel to the main axis of the drum, said first draining roll being pressed against the drum in order to define a first nip therewith in which the aggregate may pass and be squeezed, said first draining roll comprising:
- a first shaft extending along said first axis;
- at least two first supporting members fixed transversely onto said first shaft, said first supporting members having first holes in the direction of the first axis;
- a first hollow cylindrical shell having a thick wall defined by an outside surface and an inside surface, said first hollow cylindrical shell being coaxial with said first shaft and being supported by said first supporting members, said first hollow cylindrical shell having a substantially uniform distribution of first openings extending radially with respect to the first axis; and - a first perforated filter screen fixed against and around the outside surface, said first perforated filter screen having first perforations evenly distributed so that some first perforations lie over first openings in the first hollow cylindrical shell while other first perforations lie over part of the first hollow cylindrical shell without first openings, said first perforations being smaller in size than said first openings;
first liquid collection means to collect and guide liquids being pressured through said first perforated filter screen and into said first cylindrical shell as well as liquids dropping down from the first perforated filter screen; and first wiping means mounted in a stationary position in between the drum and the first collection means, said first wiping means being set against a lower part of said first draining roll to wipe the fibers off the first perforated filter screen.
a rotatable drum having a main longitudinal axis and an outer surface covered with a resilient layer;
a first draining roll having a first axis parallel to the main axis of the drum, said first draining roll being pressed against the drum in order to define a first nip therewith in which the aggregate may pass and be squeezed, said first draining roll comprising:
- a first shaft extending along said first axis;
- at least two first supporting members fixed transversely onto said first shaft, said first supporting members having first holes in the direction of the first axis;
- a first hollow cylindrical shell having a thick wall defined by an outside surface and an inside surface, said first hollow cylindrical shell being coaxial with said first shaft and being supported by said first supporting members, said first hollow cylindrical shell having a substantially uniform distribution of first openings extending radially with respect to the first axis; and - a first perforated filter screen fixed against and around the outside surface, said first perforated filter screen having first perforations evenly distributed so that some first perforations lie over first openings in the first hollow cylindrical shell while other first perforations lie over part of the first hollow cylindrical shell without first openings, said first perforations being smaller in size than said first openings;
first liquid collection means to collect and guide liquids being pressured through said first perforated filter screen and into said first cylindrical shell as well as liquids dropping down from the first perforated filter screen; and first wiping means mounted in a stationary position in between the drum and the first collection means, said first wiping means being set against a lower part of said first draining roll to wipe the fibers off the first perforated filter screen.
2. An apparatus according to claim 4, further comprising first pressure means to apply a first pressure on said first shaft of the first draining roll and thus press said first draining roll toward the drum.
3. An apparatus according to claim 2, wherein the surface ratio of the first openings to the outside surface of the first hollow cylindrical shell ranges between 30 and 50%.
4. An apparatus according to claim 3 wherein the surface ratio of the first perforations to the whole surface of the first filter screen ranges between 20 and 40%.
5. An apparatus according to claim 4 wherein:
said resilient layer is made of rubber; and said first perforated filter screen is made of steel.
said resilient layer is made of rubber; and said first perforated filter screen is made of steel.
6. An apparatus according to claim 1 further comprising:
a second draining roll having a second axis parallel to the main axis of the drum, said second draining roll being pressed against the drum in a position lower than the first draining roll in order to define a second nip therewith in which the aggregate may pass and be squeezed, said second draining roll comprising:
- a second shaft extending along said second axis;
- at least two second supporting members fixed transversely onto said second shaft, said second supporting members having second holes in the direction of the second axis;
- a second hollow cylindrical shell having a thick wall defined by an outside surface and an inside surface, said second hollow cylindrical shell being coaxial with said second shaft and being supported by said second supporting members, said second hollow cylindrical shell having a substantially uniform distribution of second openings extending radially with respect to the second axis, said second openings being smaller in size than the first openings of the first draining roll; and - a second perforated filter screen fixed against and around the outside surface, said second perforated filter screen having second perforations evenly distributed so that some second perforations lie over second openings in the second hollow cylindrical shell while other second perforations lie over part of the second hollow cylindrical shell without second openings, said second perforations having substantially the same size as the first perforations of the first filter screen;
second liquid collection means to collect and guide liquids being pressured through said second perforated filter screen and into said second cylindrical shell as well as liquids dropping down from the second perforated filter screen;
and second wiping means mounted in a stationary position in between the drum and the second collection means, said second wiping means being set against a lower part of said second draining roll close to the second nip in order to wipe the fibers off the second perforated filter screen.
a second draining roll having a second axis parallel to the main axis of the drum, said second draining roll being pressed against the drum in a position lower than the first draining roll in order to define a second nip therewith in which the aggregate may pass and be squeezed, said second draining roll comprising:
- a second shaft extending along said second axis;
- at least two second supporting members fixed transversely onto said second shaft, said second supporting members having second holes in the direction of the second axis;
- a second hollow cylindrical shell having a thick wall defined by an outside surface and an inside surface, said second hollow cylindrical shell being coaxial with said second shaft and being supported by said second supporting members, said second hollow cylindrical shell having a substantially uniform distribution of second openings extending radially with respect to the second axis, said second openings being smaller in size than the first openings of the first draining roll; and - a second perforated filter screen fixed against and around the outside surface, said second perforated filter screen having second perforations evenly distributed so that some second perforations lie over second openings in the second hollow cylindrical shell while other second perforations lie over part of the second hollow cylindrical shell without second openings, said second perforations having substantially the same size as the first perforations of the first filter screen;
second liquid collection means to collect and guide liquids being pressured through said second perforated filter screen and into said second cylindrical shell as well as liquids dropping down from the second perforated filter screen;
and second wiping means mounted in a stationary position in between the drum and the second collection means, said second wiping means being set against a lower part of said second draining roll close to the second nip in order to wipe the fibers off the second perforated filter screen.
7. An apparatus according to claim 6, further comprising:
first pressure means to apply a first pressure on said first shaft of the first draining roll and thus press said first draining roll against the drum; and second pressure means to apply a second pressure on said second shaft of the second draining roll and thus press said second draining roll against the drum, said second pressure being greater than said first pressure.
first pressure means to apply a first pressure on said first shaft of the first draining roll and thus press said first draining roll against the drum; and second pressure means to apply a second pressure on said second shaft of the second draining roll and thus press said second draining roll against the drum, said second pressure being greater than said first pressure.
8. An apparatus according to claim 7 wherein:
the surface ratio of the first openings to the outside surface of the first hollow cylindrical shell ranges between 30 and 50%; and the surface ratio of the second openings to the outside surface of the second hollow cylindrical shell ranges between 10 and 30%.
the surface ratio of the first openings to the outside surface of the first hollow cylindrical shell ranges between 30 and 50%; and the surface ratio of the second openings to the outside surface of the second hollow cylindrical shell ranges between 10 and 30%.
9. An apparatus according to claim 8 wherein the surface ratio of the first and second perforations to the whole surface of the first and second filter screen range between 20 and 40%, respectively.
10. An apparatus according to claim 9 wherein:
said resilient layer is made of rubber; and said first and second perforated filter screens are made of steel.
said resilient layer is made of rubber; and said first and second perforated filter screens are made of steel.
11. An apparatus according to claim 6 further comprising:
a third draining roll having a third axis parallel to the main axis of the drum, said third draining roll being pressed against the drum in a position lower than the second draining roll in order to define a third nip therewith in which the aggregate may pass and be squeezed, said third draining roll comprising:
- a third shaft extending along said third axis;
- at least two third supporting members fixed transversely onto said third shaft, said third supporting members having third holes in the direction of the third axis;
- a third hollow cylindrical shell having a thick wall defined by an outside surface and an inside surface, said third hollow cylindrical shell being coaxial with said third shaft and being supported by said third supporting members, said third hollow cylindrical shell having a substantially uniform distribution of third openings extending radially with respect to the third axis, said third openings being smaller in size than the second openings of the second draining roll;
and - a third perforated filter screen fixed against and around the outside surface, said third perforated filter screen having third perforations evenly distributed so that some third perforations lie over third openings in the third hollow cylindrical shell while other third perforations lie over part of the third hollow cylindrical shell without third openings, said third perforations having substantially the same size as the first and second perforations of the first and second filter screen;
third liquid collection means to collect and guide liquids being pressured through said third perforated filter screen and into said third cylindrical shell as well as liquids dropping down from the third perforated filter screen; and third wiping means mounted in a stationary position in between the drum and the third collection means, said third wiping means being set against a lower part of said third draining roll close to the third nip in order to wipe the fibers off the third perforated filter screen.
a third draining roll having a third axis parallel to the main axis of the drum, said third draining roll being pressed against the drum in a position lower than the second draining roll in order to define a third nip therewith in which the aggregate may pass and be squeezed, said third draining roll comprising:
- a third shaft extending along said third axis;
- at least two third supporting members fixed transversely onto said third shaft, said third supporting members having third holes in the direction of the third axis;
- a third hollow cylindrical shell having a thick wall defined by an outside surface and an inside surface, said third hollow cylindrical shell being coaxial with said third shaft and being supported by said third supporting members, said third hollow cylindrical shell having a substantially uniform distribution of third openings extending radially with respect to the third axis, said third openings being smaller in size than the second openings of the second draining roll;
and - a third perforated filter screen fixed against and around the outside surface, said third perforated filter screen having third perforations evenly distributed so that some third perforations lie over third openings in the third hollow cylindrical shell while other third perforations lie over part of the third hollow cylindrical shell without third openings, said third perforations having substantially the same size as the first and second perforations of the first and second filter screen;
third liquid collection means to collect and guide liquids being pressured through said third perforated filter screen and into said third cylindrical shell as well as liquids dropping down from the third perforated filter screen; and third wiping means mounted in a stationary position in between the drum and the third collection means, said third wiping means being set against a lower part of said third draining roll close to the third nip in order to wipe the fibers off the third perforated filter screen.
12. An apparatus according to claim 14, further comprising:
first pressure means to apply a first pressure on said first shaft of the first draining roll and thus press said first draining roll against the drum;
second pressure means to apply a second pressure on said second shaft of the second draining roll and thus press said second draining roll against the drum, said second pressure being greater than said first pressure; and third pressure means to apply a third pressure on said third shaft of the third draining roll and thus press said third draining roll against the drum, said third pressure being greater than said second pressure.
first pressure means to apply a first pressure on said first shaft of the first draining roll and thus press said first draining roll against the drum;
second pressure means to apply a second pressure on said second shaft of the second draining roll and thus press said second draining roll against the drum, said second pressure being greater than said first pressure; and third pressure means to apply a third pressure on said third shaft of the third draining roll and thus press said third draining roll against the drum, said third pressure being greater than said second pressure.
13. An apparatus according to claim 12 wherein:
the surface ratio of the first openings to the outside surface of the first hollow cylindrical shell ranges between 30 and 50%;
the surface ratio of the second openings to the outside surface of the second hollow cylindrical shell ranges between 10 and 30%; and the surface ratio of the third openings to the outside surface of the third hollow cylindrical shell ranges between 5 and 10%.
the surface ratio of the first openings to the outside surface of the first hollow cylindrical shell ranges between 30 and 50%;
the surface ratio of the second openings to the outside surface of the second hollow cylindrical shell ranges between 10 and 30%; and the surface ratio of the third openings to the outside surface of the third hollow cylindrical shell ranges between 5 and 10%.
14. An apparatus according to claim 13 wherein the surface ratios of the first, second and third perforations to the whole surfaces of the first, second and third filter screens range between 20 and 40%, respectively.
15. An apparatus according to claim 14 wherein:
said resilient layer is made of rubber; and said first, second and third perforated filter screens are made of steel.
said resilient layer is made of rubber; and said first, second and third perforated filter screens are made of steel.
16. An apparatus according to claim 1, further comprising driving means to controllably rotate said drum.
17. An apparatus according to claim 6, further comprising driving means to controllably rotate said drum.
18. An apparatus according to claim 11, further comprising driving means to controllably rotate said drum.
19. An apparatus according to claim 12, further comprising driving means to controllably rotate said drum.
20. An apparatus according to claim 14, further comprising driving means to controllably rotate said drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002196443A CA2196443A1 (en) | 1997-01-30 | 1997-01-30 | Liquids extractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002196443A CA2196443A1 (en) | 1997-01-30 | 1997-01-30 | Liquids extractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2196443A1 true CA2196443A1 (en) | 1998-07-30 |
Family
ID=4159789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002196443A Abandoned CA2196443A1 (en) | 1997-01-30 | 1997-01-30 | Liquids extractor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2196443A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2941155A1 (en) * | 2009-01-20 | 2010-07-23 | Bernard Beaulieu | INSTALLATION AND METHOD FOR SAMPLEING A VERY STRONG LOADING EFFLUENT OF SUSPENDED MATERIALS. |
| WO2020027662A3 (en) * | 2018-08-03 | 2020-04-16 | Taurus-Global B.V. | Manure pellets, and process and equipment for making the same |
-
1997
- 1997-01-30 CA CA002196443A patent/CA2196443A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2941155A1 (en) * | 2009-01-20 | 2010-07-23 | Bernard Beaulieu | INSTALLATION AND METHOD FOR SAMPLEING A VERY STRONG LOADING EFFLUENT OF SUSPENDED MATERIALS. |
| WO2010084281A1 (en) * | 2009-01-20 | 2010-07-29 | Bernard Beaulieu | Facility and method for screening an effluent with a very high load of matter in suspension |
| WO2020027662A3 (en) * | 2018-08-03 | 2020-04-16 | Taurus-Global B.V. | Manure pellets, and process and equipment for making the same |
| US12151989B2 (en) | 2018-08-03 | 2024-11-26 | Taurus-Global B.V. | Manure pellets, and process and equipment for making the same |
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