CA1121210A - Apparatus for dewatering material with high water content - Google Patents
Apparatus for dewatering material with high water contentInfo
- Publication number
- CA1121210A CA1121210A CA000342748A CA342748A CA1121210A CA 1121210 A CA1121210 A CA 1121210A CA 000342748 A CA000342748 A CA 000342748A CA 342748 A CA342748 A CA 342748A CA 1121210 A CA1121210 A CA 1121210A
- Authority
- CA
- Canada
- Prior art keywords
- belts
- belt
- press
- sections
- rolls
- 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.)
- Expired
Links
Classifications
-
- 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
- B30B9/24—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 an endless pressing band
- B30B9/247—Pressing band constructions
-
- 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
- B30B9/24—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 an endless pressing band
- B30B9/246—The material being conveyed around a drum between pressing bands
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
- Press Drives And Press Lines (AREA)
- Paper (AREA)
Abstract
ABSTRACT
This invention relates to an apparatus for dewatering material having a high water content, for example peat, digested sludge etc.
Besides vacuum filters, for dewatering such material presses are used which, however, have proved not to meet desired requirements with respect to efficiency and capacity.
For solving this problem and, thus, to bring about an efficient dewatering press with high capacity, according to this invention an apparatus is proposed which comprises two endless belts of elastomer material, which between a feed opening for feeding in the material to be dewatered and a discharge?ppening run abutting each other, with the material fed-in between themselves, over common press rolls for pressing the water out of the material, and which belts are provided with water discharge means.
This invention relates to an apparatus for dewatering material having a high water content, for example peat, digested sludge etc.
Besides vacuum filters, for dewatering such material presses are used which, however, have proved not to meet desired requirements with respect to efficiency and capacity.
For solving this problem and, thus, to bring about an efficient dewatering press with high capacity, according to this invention an apparatus is proposed which comprises two endless belts of elastomer material, which between a feed opening for feeding in the material to be dewatered and a discharge?ppening run abutting each other, with the material fed-in between themselves, over common press rolls for pressing the water out of the material, and which belts are provided with water discharge means.
Description
This invention relates to an apparatus ~or de~aterLng material with a high water content such as, or exam~le, peat, digested sludge etc.
For rendering it possible to utilize peat, di~ested sludge and similar material, for example, as soil i~provement material or soil substrate, they first must be dewatered, i.e. the water content must be reduced ~ery substantially.
It is previously known to use for this purpose ~acuum filters or dewatering presses, but none of these devices has proved to have the desired eff1ciency and high capacity.
The object of the present invention, therefore~ is to produce a dewatering apparatus for aqueous material as, for example, peat and digested sludge, which apparatus reduces the water content of the material with high efficiency, has hi~h capacity and yet is of simple, inexpensive but operationally reliable design.
According to a broad aspect the invention relates to apparatus for dewatering aqueous materials and comprises two endless driven belts defining therebetween a feed opening for feeding in the material to be dewatexed between ths belts and a discharge end run abutting each other over common press rolls for pressing water out of the material, and which belts are pro~ided with slits for removing the water, said slits being normally closed and, .: ., : ., ,. .. ~ . , - ::
l(a) ~
upon passage over a press roll, ar~ opened for remo~ing the water; said slits extending perpendicularly in relation to the longitudinal direction of the belt and between longitudinal support and clamping sections, which are formed in the belt or loose relative thereto.
The invention is described in greater detail in the follow-. , . ;
` "'~
: ~ . :. :: .
, : -ing, with reference to the accompanying drawinvs~ in which Fig. 1 is a schematic side view of the apparatus according to the invention, Fig. 2 is a section through bèlts comprised in the apparatus, substantially along the line II-II
in Fig. 1, Fig. 3 is a view of a portion of the press belts seen from below or above in Fig. 2, Fig. 4 shows an enlarged portion of Fig. 3, and Figs. S and 6 are sections along substantially the line ~-V
in Fig. 4 in the non-operative, i.e. not press-ing, and, respectively, in the operative, i.e.
pressing state of the press belts.
The de~atering apparatus according to the invention comprises two endless press belts, viz. one upper belt 1 and one lower bel-t 2, which meet at one end of the apparatus where they form a tapering feed opening 3 and separate from each other at the other end of the apparatus where they form a discharge opening 4. At said discharge opening, the upper press belt 1 runs over an end roll 5, and the lower press belt 2 runs over an end roll 6, which is located offset relative to said end ro~l 5 of the upper press belt,in such a manner, that the lower press belt extends past said lastmentioned end roll and forms said discharge opening 4 and a collecting path 7 for receiving material scraped off from the upper press belt by a scraper means 8. A similar scraper means g is also provided for the lower peess balt at its end roll 6. The two end~rolls 5 and 6 are driven and run in opposed directions, ,, ~ ..... . .
,~ .
' :, ' ~,' ' .
i.e. in the directions indicated by the arrows 9 and 10, and thus are the drive rolls of ~he respective belt.
Bet~een the feed o~ening 3 and the discharge opening 4 the press belts 1,2 run abutting each other about common press rolls, which are designated, in turn counted from the feed opening, by 11,12,13,14,15,16,17 and 1~ and so arranged relative to each other that the angle of contact between press belts and, respectively, press rolls is as great as possible, i.e. amounts up to or above 180. The first one 11 and the last one 18 of said press rolls are so-called single rolls, while the remaining press rolls are arranged in pairs, in such a manner, that at least one press roll 12,14,16 in each such pair is movable in relation to the second press roll 13,15 and, resp~ctively, 17 in the respective pair, and between ~he press rolls in each pair a stretching mechanism 20 is provided for changing the mutual distance between the rolls 12,13,14,15,16,17 in the pair and thereby for changing the pressing force achieved by causin~ the press belts 1,2 together to run about the press rolls. At the embodiment shown in the drawings, the press rolls have a diameter de-creasing from the feed opening, i.e. the roll 12 has a smaller diameter than the roll 11, and the roll 13 has a smaller diameter than the roll 12. Hereby the pressing force successively increases in the direction from the feed opening 3 and the discharge opening 4. Also the location of the drive rolls of the belt after the last press roll contributes to . .
said ~ressing force increase.
, In Fig. 1 the stretching mechanism 20 between the press rolls in each pair is shown to comprise two telescopic members 21 and 22, which hydraulically or pneumatically are movable relative to each other by a self-locking screu--nut device, and which with their free ends abut carriages 23 each of their press roll, which carriages are provided with pressure rollers.
The numeral 24 designates two link rolls for the return strand la of the press belt, and 25 designates two link_ rolls for the return strand 2a of the lower press belt.
The said link rolls 24, 25 form the tapering feed opening 3 with a substantially horizontal feed plane 26 for feeding in the material to be de~latered.
The two press belts ~,2 have similar structural design and consist of elastomer material, for example rubber. Each belt has a plane surface 27, by which they abut each other by means of the press section of the apparatus which extends between -the feed and discharge openings 3 and 4. On their other surface the belts are provided with longitudinal parallel support and clamping sectlons 2~.
The said sections preferably are reinforced and also constit-ute the belt elements -taking up the tensile forces. For obtaining an efficient transfer of driving force from the drive rolls to the belts withou-t risk of skidding, the drive rolls 5,6 are provided with grooves, which both in number and cross-sectional shape correspond to said sections of the belts, and in which thùs said sections 28 run. In order to bring about the strongest possible drive engagement between , '' --5~
section and groove, the sections 28 as shown for example in Fig. 3 preferably should have a width tapering from the belt, i.e. they should be key- or ~V-belt shaped like the grooves. For guiding the belts, at least one of the link rolls 24, 25 of each belt can be provided with correspond-ing grooves, and also the press rolls can be formed with such grooves. The grooves in the press rolls, however, must have a depth smaller than the height of the sections, so that the belt is carried at least slightly spaced from the shell surace of the press rolls, for the reason appearinE
from the following and from Fig. 6.
Each belt shows between the sections 28 transverse slits 29 with a small width and relatively densely arranged, i.e.
the defining edges 30 of the slits normally shall abut each other tFig. 5) in order to prevent material fed in between the belts from penetrating out through the slits while the belts abutting each other move between the press rolls.
~hen the press belts àre passing over a press roll, the belts are clamped together by the support and clamp sections 28 lying directly in front of each other, and thereby also the material fed in between the belts is compressed, at the same time as the material between the belts subjects the edge portions 31 of the slits to outwardly directed forces, so that these portions are bent outward ~see Fig. 6)7against the action of the elasticity of the elastomer material, until substantially only point and/or line contact exists between the defining surfaces 30 of the slits. The degree of outward ;' ~ ' ' ~' ' ' , :
':' - ~ :
bending of said portions is determined by the elasticity of the materiaI and by the distance between the sections 28.
In the outward bent state shown in Fig. 6 the slits 29 permit only the water pressed out of the material to be forced out, while the material in general is retained between the belts 1 and 2, owing to the fact that the slits can be opened only to a limited extent. The water pressed out is conducted away by drains 32, of which for reason of simplicity only a portion is shown in Fig. 1.
By increasing the pressin~ force successively in the direction to the discharge opening, as previously mentioned, the material is dewatered gradually, so that the apparatus according to the present invention can operate continuously without interruption, with high capacity as a result thereof. I-t has also ~roved possible by the apparatus according to -the invent-ion to substantially reduce the water content in peat as well as in digested sludge and other aqueous materials.
~he present invention is not restricted to the embodiment described above and shown in the drawing, but can be modified in many different ways within the scope of the invention idea defined in the attached claims. The slits of the belts, for example, though not shown in the drawings, may be located out of phase~ i.e. not directly in frontof but between each other.
Furthermore, the number of press rolls between the rolls 11 and 18 may be both greater and smaller than the number shown in the drawings, i.e. greater or smaller than 9iX, and these press rolls need not bè arranged in pairs, either, for rendering lt possible to change the pressing force, because :: :~ . !.. : . .
: .. . .
~', ' :.
., ~
'.. .. ~: .' . ,'' said change can be effected also by designing one or several of the link rolls andtor drive rolls movable. The location of the rolls relative to each other as shown can also be changed in many different ways within the scope of the in-vention and~ for example, may be such that the discharge opening faces downward.
As regards the support and clamping sections, they preferably should be loose relative to the belts instead of being integ-ral or connected therewith, and they should be stretchable independen-tly of the belts, so that the pressing force can be increased without affecting the slits of the belts. But also in this case some support and clamping section may be connected with the belts, for example the outer ones.
~ "
. . ~ . .
.1 ,- : --:
. : ,
For rendering it possible to utilize peat, di~ested sludge and similar material, for example, as soil i~provement material or soil substrate, they first must be dewatered, i.e. the water content must be reduced ~ery substantially.
It is previously known to use for this purpose ~acuum filters or dewatering presses, but none of these devices has proved to have the desired eff1ciency and high capacity.
The object of the present invention, therefore~ is to produce a dewatering apparatus for aqueous material as, for example, peat and digested sludge, which apparatus reduces the water content of the material with high efficiency, has hi~h capacity and yet is of simple, inexpensive but operationally reliable design.
According to a broad aspect the invention relates to apparatus for dewatering aqueous materials and comprises two endless driven belts defining therebetween a feed opening for feeding in the material to be dewatexed between ths belts and a discharge end run abutting each other over common press rolls for pressing water out of the material, and which belts are pro~ided with slits for removing the water, said slits being normally closed and, .: ., : ., ,. .. ~ . , - ::
l(a) ~
upon passage over a press roll, ar~ opened for remo~ing the water; said slits extending perpendicularly in relation to the longitudinal direction of the belt and between longitudinal support and clamping sections, which are formed in the belt or loose relative thereto.
The invention is described in greater detail in the follow-. , . ;
` "'~
: ~ . :. :: .
, : -ing, with reference to the accompanying drawinvs~ in which Fig. 1 is a schematic side view of the apparatus according to the invention, Fig. 2 is a section through bèlts comprised in the apparatus, substantially along the line II-II
in Fig. 1, Fig. 3 is a view of a portion of the press belts seen from below or above in Fig. 2, Fig. 4 shows an enlarged portion of Fig. 3, and Figs. S and 6 are sections along substantially the line ~-V
in Fig. 4 in the non-operative, i.e. not press-ing, and, respectively, in the operative, i.e.
pressing state of the press belts.
The de~atering apparatus according to the invention comprises two endless press belts, viz. one upper belt 1 and one lower bel-t 2, which meet at one end of the apparatus where they form a tapering feed opening 3 and separate from each other at the other end of the apparatus where they form a discharge opening 4. At said discharge opening, the upper press belt 1 runs over an end roll 5, and the lower press belt 2 runs over an end roll 6, which is located offset relative to said end ro~l 5 of the upper press belt,in such a manner, that the lower press belt extends past said lastmentioned end roll and forms said discharge opening 4 and a collecting path 7 for receiving material scraped off from the upper press belt by a scraper means 8. A similar scraper means g is also provided for the lower peess balt at its end roll 6. The two end~rolls 5 and 6 are driven and run in opposed directions, ,, ~ ..... . .
,~ .
' :, ' ~,' ' .
i.e. in the directions indicated by the arrows 9 and 10, and thus are the drive rolls of ~he respective belt.
Bet~een the feed o~ening 3 and the discharge opening 4 the press belts 1,2 run abutting each other about common press rolls, which are designated, in turn counted from the feed opening, by 11,12,13,14,15,16,17 and 1~ and so arranged relative to each other that the angle of contact between press belts and, respectively, press rolls is as great as possible, i.e. amounts up to or above 180. The first one 11 and the last one 18 of said press rolls are so-called single rolls, while the remaining press rolls are arranged in pairs, in such a manner, that at least one press roll 12,14,16 in each such pair is movable in relation to the second press roll 13,15 and, resp~ctively, 17 in the respective pair, and between ~he press rolls in each pair a stretching mechanism 20 is provided for changing the mutual distance between the rolls 12,13,14,15,16,17 in the pair and thereby for changing the pressing force achieved by causin~ the press belts 1,2 together to run about the press rolls. At the embodiment shown in the drawings, the press rolls have a diameter de-creasing from the feed opening, i.e. the roll 12 has a smaller diameter than the roll 11, and the roll 13 has a smaller diameter than the roll 12. Hereby the pressing force successively increases in the direction from the feed opening 3 and the discharge opening 4. Also the location of the drive rolls of the belt after the last press roll contributes to . .
said ~ressing force increase.
, In Fig. 1 the stretching mechanism 20 between the press rolls in each pair is shown to comprise two telescopic members 21 and 22, which hydraulically or pneumatically are movable relative to each other by a self-locking screu--nut device, and which with their free ends abut carriages 23 each of their press roll, which carriages are provided with pressure rollers.
The numeral 24 designates two link rolls for the return strand la of the press belt, and 25 designates two link_ rolls for the return strand 2a of the lower press belt.
The said link rolls 24, 25 form the tapering feed opening 3 with a substantially horizontal feed plane 26 for feeding in the material to be de~latered.
The two press belts ~,2 have similar structural design and consist of elastomer material, for example rubber. Each belt has a plane surface 27, by which they abut each other by means of the press section of the apparatus which extends between -the feed and discharge openings 3 and 4. On their other surface the belts are provided with longitudinal parallel support and clamping sectlons 2~.
The said sections preferably are reinforced and also constit-ute the belt elements -taking up the tensile forces. For obtaining an efficient transfer of driving force from the drive rolls to the belts withou-t risk of skidding, the drive rolls 5,6 are provided with grooves, which both in number and cross-sectional shape correspond to said sections of the belts, and in which thùs said sections 28 run. In order to bring about the strongest possible drive engagement between , '' --5~
section and groove, the sections 28 as shown for example in Fig. 3 preferably should have a width tapering from the belt, i.e. they should be key- or ~V-belt shaped like the grooves. For guiding the belts, at least one of the link rolls 24, 25 of each belt can be provided with correspond-ing grooves, and also the press rolls can be formed with such grooves. The grooves in the press rolls, however, must have a depth smaller than the height of the sections, so that the belt is carried at least slightly spaced from the shell surace of the press rolls, for the reason appearinE
from the following and from Fig. 6.
Each belt shows between the sections 28 transverse slits 29 with a small width and relatively densely arranged, i.e.
the defining edges 30 of the slits normally shall abut each other tFig. 5) in order to prevent material fed in between the belts from penetrating out through the slits while the belts abutting each other move between the press rolls.
~hen the press belts àre passing over a press roll, the belts are clamped together by the support and clamp sections 28 lying directly in front of each other, and thereby also the material fed in between the belts is compressed, at the same time as the material between the belts subjects the edge portions 31 of the slits to outwardly directed forces, so that these portions are bent outward ~see Fig. 6)7against the action of the elasticity of the elastomer material, until substantially only point and/or line contact exists between the defining surfaces 30 of the slits. The degree of outward ;' ~ ' ' ~' ' ' , :
':' - ~ :
bending of said portions is determined by the elasticity of the materiaI and by the distance between the sections 28.
In the outward bent state shown in Fig. 6 the slits 29 permit only the water pressed out of the material to be forced out, while the material in general is retained between the belts 1 and 2, owing to the fact that the slits can be opened only to a limited extent. The water pressed out is conducted away by drains 32, of which for reason of simplicity only a portion is shown in Fig. 1.
By increasing the pressin~ force successively in the direction to the discharge opening, as previously mentioned, the material is dewatered gradually, so that the apparatus according to the present invention can operate continuously without interruption, with high capacity as a result thereof. I-t has also ~roved possible by the apparatus according to -the invent-ion to substantially reduce the water content in peat as well as in digested sludge and other aqueous materials.
~he present invention is not restricted to the embodiment described above and shown in the drawing, but can be modified in many different ways within the scope of the invention idea defined in the attached claims. The slits of the belts, for example, though not shown in the drawings, may be located out of phase~ i.e. not directly in frontof but between each other.
Furthermore, the number of press rolls between the rolls 11 and 18 may be both greater and smaller than the number shown in the drawings, i.e. greater or smaller than 9iX, and these press rolls need not bè arranged in pairs, either, for rendering lt possible to change the pressing force, because :: :~ . !.. : . .
: .. . .
~', ' :.
., ~
'.. .. ~: .' . ,'' said change can be effected also by designing one or several of the link rolls andtor drive rolls movable. The location of the rolls relative to each other as shown can also be changed in many different ways within the scope of the in-vention and~ for example, may be such that the discharge opening faces downward.
As regards the support and clamping sections, they preferably should be loose relative to the belts instead of being integ-ral or connected therewith, and they should be stretchable independen-tly of the belts, so that the pressing force can be increased without affecting the slits of the belts. But also in this case some support and clamping section may be connected with the belts, for example the outer ones.
~ "
. . ~ . .
.1 ,- : --:
. : ,
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for dewatering aqueous materials, such as peat, digested sludge and the like, characterized in that said apparatus comprises two endless driven belts defining therebetween a feed opening for feeding in the material to be dewatered between the belts and a discharge end run abutting each other over common press rolls for pressing water out of the material, and which belts are provided with slits for removing the water, said slits being normally closed and, upon passage over a press roll, are opened for removing the water; said slits extending perpendicularly in relation to the longitudinal direction of the belt and between longitudinal support and clamping sections, which are formed in the belt or loose relative thereto.
2. An apparatus as defined in claim 1, characterized in that the press rolls located along the direction of movement of the belt between the feed opening and the discharge end have decreasing diameter.
3. An apparatus as defined in claim 2 characterized in that the support and clamping section, which are loose relative to the belts, are stretchable independently of the belts.
4. An apparatus as defined in claim 3 characterized in that at the discharge end a drive roll is provided for each press belt.
5. An apparatus as defined in claim 4 characterized in that the drive rolls are provided with grooves corresponding to the sections of the belt for driving engagement with said sections.
6. An apparatus as defined in claim 5 characterized in that the press rolls are provided with grooves corresponding to the sections of the belt, and the grooves have a depth smaller than the height of the sections.
7. An apparatus as defined in any one of the claims 4, 5 or 6 characterized in that the sections of the belts have key-shaped or V-belt shaped cross section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7900190A SE422761B (en) | 1979-01-09 | 1979-01-09 | DEVICE FOR DRAINAGE OF WATER-MIXED MATERIALS, AS EXAMPLE OF POWDER, ROOT SLAM AND LIKE |
| SE7900190-5 | 1979-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1121210A true CA1121210A (en) | 1982-04-06 |
Family
ID=20336979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000342748A Expired CA1121210A (en) | 1979-01-09 | 1979-12-28 | Apparatus for dewatering material with high water content |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1121210A (en) |
| DE (1) | DE3000207A1 (en) |
| FI (1) | FI800044A (en) |
| SE (1) | SE422761B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4909851A (en) * | 1982-07-31 | 1990-03-20 | Ciba-Geigy Corporation | Pigment compositions |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE8002927L (en) * | 1980-04-18 | 1981-10-19 | Hydrovag Ab | DEVICE FOR PRESSURE DRAINAGE OF MATERIALS |
| DE4126143C2 (en) * | 1991-08-07 | 1994-07-07 | Kraftanlagen Ag | Belt press with adjustable tension of your printing belt |
| DE29611654U1 (en) * | 1996-07-04 | 1996-09-05 | Gebr. Bellmer GmbH + Co KG Maschinenfabrik, 75223 Niefern-Öschelbronn | Device for dewatering suspensions |
-
1979
- 1979-01-09 SE SE7900190A patent/SE422761B/en unknown
- 1979-12-28 CA CA000342748A patent/CA1121210A/en not_active Expired
-
1980
- 1980-01-04 DE DE19803000207 patent/DE3000207A1/en not_active Withdrawn
- 1980-01-07 FI FI800044A patent/FI800044A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4909851A (en) * | 1982-07-31 | 1990-03-20 | Ciba-Geigy Corporation | Pigment compositions |
Also Published As
| Publication number | Publication date |
|---|---|
| SE422761B (en) | 1982-03-29 |
| DE3000207A1 (en) | 1980-08-14 |
| FI800044A (en) | 1980-07-10 |
| SE7900190L (en) | 1980-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |