CA2063252A1 - Screen-belt press - Google Patents
Screen-belt pressInfo
- Publication number
- CA2063252A1 CA2063252A1 CA002063252A CA2063252A CA2063252A1 CA 2063252 A1 CA2063252 A1 CA 2063252A1 CA 002063252 A CA002063252 A CA 002063252A CA 2063252 A CA2063252 A CA 2063252A CA 2063252 A1 CA2063252 A1 CA 2063252A1
- Authority
- CA
- Canada
- Prior art keywords
- belts
- screen
- belt
- pressings
- chain
- 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
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
-
- 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
- B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
- B01D33/042—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering whereby the filtration and squeezing-out take place between at least two filtering bands
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filtration Of Liquid (AREA)
- Press Drives And Press Lines (AREA)
- Paper (AREA)
Abstract
Disclosed is a travelling-screen press with travelling screens (3) which pass on a support belt between rollers which can be displaced at right angles to the direction of motion of the screens (3) so that the screens (3) can be pressed against each other. The support belts (1) have drainage channels for the water squeezed out by the screens (3). Each support belt is made up of flexible webbing or chain (1), and plate-like pressing elements (10) are connected to the flexible webbing or the chain (1). The rollers (9) are displaced separately with different pressures by means of hydraulic cylinder-piston units (12).
Description
2 0 ~ 3 2 .j 2 SCREEN-B~LT PRESS
The invention refers to a screen-belt press with rotating screen belts, which can be pressed against each other, via a supporting belt, by rolls that can be applied perpendicularly to the running direction of the screen-belts and the supporting belts; the supporting belts have draining channels for the water of the substance that is pressed out by the screen-belts. The supporting belts are formed by either a flexible strap or a chain, and plate-shaped pressings are connected with the flexible strap or the chain.
In screen-belt presses with a flexible supporting belt, the material that shall be drained, e.g. the sludge from sewage purification facilities but also in the production of fruit juices, is exposed to a compressing pressure between continuous filter-belts or screen-belts; the water that is pressed out of the substance is drained off through the screen-belts. ~-Therefore, it is required that the screen-belts should 20 be sufficiently water-permeable and that they consist of ~ -an adequately permeable material or fabric. Such screen-belts must be of adequate heavy-duty mechanical construction. The required compressing pressure is upheld mainly by a number of cylinders or rolls which operate perpendicularly to the running direction of the screen-belts. As a rule, an advantageous screen opening is set according to the respective requirements.
However, the adjustable compressing pressure cannot be ; raised at will since the distance between adjacent press rolls, which are effectively perpendicular to the running direction of the screen-belt, cannot be chosen ; as close as one likes for geometrical reasons, and conversely, given adequately large supporting surfaces, the drainage of the water that is pressed out of the substance could not be guaranteed any longer. It is already known that for the application of higher ,, : .
., . , . . , A
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, ~ ' ` , . .
.' : - ., ' , ' ~ ' . .
2 20~32~2 compressing pressures and in particular for the mechanical protection of the delicate material of the screen-belt, carrying belts are set up parallel to the screen-belts in the pressing areas of such filter-belt presses; these carrying belts have draining channels that run perpendicularly and that are open towards the filter-belt in order to drain off the water from the substance.
Such carrying belts must be sufficiently flexible in order to go over fairleads and driving rolls; due to the required flexibility of the material of the carrying belt the maximum compressing pressure in filter-belt presses ls also in this case limited. Such design, which uses carrying belts with grooves that are open towards the screen-belt, is described, for example, by DE-PS 28 44 716 or DE-PS 28 44 715.
AT-PS 287 501 describes a screen-belt press which is of the same design as the one mentioned in the beginning; in this case, plate-shaped pressings are connected with the supporting belts in order to reach higher compressing pressures. Rolls, which are mounted - in a common frame on both sides of the press zone, are provided for the support. The shape of the press zone may be altered by the respective adjustment of the frames.
The invention is aimed to further develop a ; screen-belt press of the above-mentioned design, which uses respective supporting elements in addition to the rotating screen-belts, to the effect that also higher compressing pressures become specifically possible in different areas of the press zone without causing a mechanical overload on the screen-belts or the supporting belts. In order to solve this problem the screen-belt press, pursuant to the invention, is essentially based on the fact that the rolls can be operated separately with different pressures via .
: - , .. : -- - . ............................ ~.
: , -, .
..
2a~32.32 hydraulic-cylinder ram components. Since supporting belts are used, which are fonned by either a flexible strap or a chain, and since plate-shaped, and to a great extent inflexible pressings, are provided for, which are connected with such flexible strap or chain, it is possible to reach higher compressing pressures and higher surface pressures, distributed over the area.
Based on the fact that the strap or the chain can be moved with the screen-belt in the same speed and in the running direction of the screen-belt, the mechanical ; load on the screen-belt can be kept low. Due to the - essentially inflexible nature of the plate-shaped pressings, it is possible to reach a good distribution of the pressure intensity over the surface, neither ~- 15 creating a regional overload on the supporting belt nor creating a regional overload on the screen-belts. With adequately flexible supporting belts the compressing pressure drops quickly in the running direction of the belt compared to the press rolls, while with essentially inflexible, plate-shaped pressings high compressing - pressures can be reached even at a distance from the rolls that are applied perpendicularly to the running direction of the screen-belts. Pursuant to the invention, the rolls are operated via hydraulic-cylinder ram components; this makes it easy to adjust the original pressure individually without risking an overload of the screen-belt, due to the equalizing effect of the plate-shaped pressings on the pressure.
The adequately precise adjustment of the desired compressing pressure can be achieved by applying different compressing pressures. The known designs, which provide inflexibly applied plates to support the screen-belts, would significantly increase the abrasion of the screen-belts. By having the pressings, which are connected with the strap or the chain, rotate with the same speed as the screen-belts, the maximum protection ',,''~
"
:
,,. .. ,, . .. , ,, ~,, - . : . .. - . . . , ,- -'.,: - . -- : ,:-: .
.' , 20~i32~2 of the screen-belts under high compressing pressure is guaranteed.
In order to enable the safe application of high compressing pressures without an additional stiffening of the machine frame, the design provides for an inflexible connection of the cylinder ram components, which face each other perpendicularly to the running direction, and for a support at this inflexible connection. As a result, the press rolls support each other and the frame is not exposed to any additional load.
The pressings may have drainage grooves and/or drainage openings that are basically the same as the ones known from the existing flexible and elastic carrying belts. By using separate, inflexible pressings, the geometrical configuration of the openings and/or the drainage grooves can be better adjusted to the requirements, irrespective of the required flexibility of the strap or the chain. Naturally, the dimensions of the openings cannot be enlarged at will, otherwise the above-mentioned carrying belts could no longer carry out their supporting function. Conversely, with essentially inflexible, plate-shaped pressings it is easily possible to implement closely adjoining draining channels for the water that is pressed out of the substance, since the materials that can be used for the pressings are far more inflexible and rigid than the materials that can be used for a flexible carrying belt which rotates over rolls or drives.
In order to keep the required flexibility despite : the essentially inflexible, plate-shaped pressings, the design can be made in a way that provides for the pressings to be positioned in the longitudinal direction of the strap or the chain(s) at a distance from each other. On the one hand, this guarantees that the plate-shaped, inflexible pressings can be directed --. - .. : - . ........ , . . - :-; . , . ,~ : , : : , . .
... . . .. - . . . , , . ~ ................ .. . .
, , . . , .. : , . ~' .:: . . : :
2~32~2 safely over the fairleads without being over- stressed by excessive deflection, and on the other hand an additional drainage effect is gained between the adjacent pressings, which allows the water that is pressed out of the substance to escape freely and to flow off through the channels that have been formed this way.
The connection of the pressings with the strap or - the chains can be made removable. A very simple solution - 10 is the implementation of screws.
This kind of connection of the pressings with the strap or the chains allows for the choosing of the fixing on the strap or the chains in such a way that the joint for each plate is only lengthways to a line which runs perpendicularly to the running direction of the screen. As a result, acute-angled re-routings via fairleads and drive rolls become possible without ~ risking any damage to the pressings.
- In the following the invention is explained in detail by examples of operation which are shown schematically in the drawing. Figure 1 of this drawing ; shows a diagram of the screen-belt press pursuant to the invention. Figure 2 shows a detail view in an enlarged --scale of the press zone with the plate-shaped, inflexible pressings that support the screen-belts and that are carried by a flexible strap or a chain.
- Figures 3 and 4 show a diagram, similar to the one of figure 2, of various possible ways to connect the inflexible, plate-shaped pressings with a flexible strap. Figure 5 shows a diagram, analogous to the ones of the figures 3 and 4, of ways to connect the inflexible, plate-shaped pressings with a chain. Figure 6 shows a partial view in the direction of the arrow VI
of figure 5.
In the screen-belt press, which is shown in figure 1, supporting belts 1 that are formed by a flexible , ,. . .
::
. ' - ' . ' - . ' ~ '.... ' : ',:~ ' ' -' . ' - , ' ~ .
. ~ . ... . . ~. ' . , , ' ' ~
2~632~2 strap or a chain are provided for. These supporting belts are directed over fairleads 2 and they carry inflexible, plate-shaped pressings, which are described more specifically in the following figures, in order to support the screen-belts or filter-belts 3 which are directed over further fairleads 4 in addition to the fairleads 2. At least one of the fairleads 2 or 4 is equipped in the regular way with a drive in order to set in motion the supporting belt or the screen-belt that operates in direct connection with it. The exact location for placing the material that shall be drained, such as sludge, is marked with 5. The place where it is dropped after it went through the press zone, which runs mainly vertically pursuant to the shown example of operation, is marked with 6.
In the area of the fairleads 4, which are on the dropping side, scrapers 7 are provided for the cleaning of the belt; a more thorough cleaning can be conducted with the cleaning equipment 8, consisting of brushes and/or sprinklers, for example, which is schematically indicated. Further, operating press rolls 9 are schematically shown in the area of the press zone; these press rolls allow the controlled application of a compressing force on the screen belts or filter-belts 3 via hydraulic-cylinder ram components and by using the supporting belts 1 that carry the pressings.
In figure 2 the supporting belts that are formed by a flexible strap or a chain are again marked with 1, and they carry inflexible, plate-shaped pressings 10 that .
serve as a support fGr the screen-belts or filter-belts
The invention refers to a screen-belt press with rotating screen belts, which can be pressed against each other, via a supporting belt, by rolls that can be applied perpendicularly to the running direction of the screen-belts and the supporting belts; the supporting belts have draining channels for the water of the substance that is pressed out by the screen-belts. The supporting belts are formed by either a flexible strap or a chain, and plate-shaped pressings are connected with the flexible strap or the chain.
In screen-belt presses with a flexible supporting belt, the material that shall be drained, e.g. the sludge from sewage purification facilities but also in the production of fruit juices, is exposed to a compressing pressure between continuous filter-belts or screen-belts; the water that is pressed out of the substance is drained off through the screen-belts. ~-Therefore, it is required that the screen-belts should 20 be sufficiently water-permeable and that they consist of ~ -an adequately permeable material or fabric. Such screen-belts must be of adequate heavy-duty mechanical construction. The required compressing pressure is upheld mainly by a number of cylinders or rolls which operate perpendicularly to the running direction of the screen-belts. As a rule, an advantageous screen opening is set according to the respective requirements.
However, the adjustable compressing pressure cannot be ; raised at will since the distance between adjacent press rolls, which are effectively perpendicular to the running direction of the screen-belt, cannot be chosen ; as close as one likes for geometrical reasons, and conversely, given adequately large supporting surfaces, the drainage of the water that is pressed out of the substance could not be guaranteed any longer. It is already known that for the application of higher ,, : .
., . , . . , A
`
, ~ ' ` , . .
.' : - ., ' , ' ~ ' . .
2 20~32~2 compressing pressures and in particular for the mechanical protection of the delicate material of the screen-belt, carrying belts are set up parallel to the screen-belts in the pressing areas of such filter-belt presses; these carrying belts have draining channels that run perpendicularly and that are open towards the filter-belt in order to drain off the water from the substance.
Such carrying belts must be sufficiently flexible in order to go over fairleads and driving rolls; due to the required flexibility of the material of the carrying belt the maximum compressing pressure in filter-belt presses ls also in this case limited. Such design, which uses carrying belts with grooves that are open towards the screen-belt, is described, for example, by DE-PS 28 44 716 or DE-PS 28 44 715.
AT-PS 287 501 describes a screen-belt press which is of the same design as the one mentioned in the beginning; in this case, plate-shaped pressings are connected with the supporting belts in order to reach higher compressing pressures. Rolls, which are mounted - in a common frame on both sides of the press zone, are provided for the support. The shape of the press zone may be altered by the respective adjustment of the frames.
The invention is aimed to further develop a ; screen-belt press of the above-mentioned design, which uses respective supporting elements in addition to the rotating screen-belts, to the effect that also higher compressing pressures become specifically possible in different areas of the press zone without causing a mechanical overload on the screen-belts or the supporting belts. In order to solve this problem the screen-belt press, pursuant to the invention, is essentially based on the fact that the rolls can be operated separately with different pressures via .
: - , .. : -- - . ............................ ~.
: , -, .
..
2a~32.32 hydraulic-cylinder ram components. Since supporting belts are used, which are fonned by either a flexible strap or a chain, and since plate-shaped, and to a great extent inflexible pressings, are provided for, which are connected with such flexible strap or chain, it is possible to reach higher compressing pressures and higher surface pressures, distributed over the area.
Based on the fact that the strap or the chain can be moved with the screen-belt in the same speed and in the running direction of the screen-belt, the mechanical ; load on the screen-belt can be kept low. Due to the - essentially inflexible nature of the plate-shaped pressings, it is possible to reach a good distribution of the pressure intensity over the surface, neither ~- 15 creating a regional overload on the supporting belt nor creating a regional overload on the screen-belts. With adequately flexible supporting belts the compressing pressure drops quickly in the running direction of the belt compared to the press rolls, while with essentially inflexible, plate-shaped pressings high compressing - pressures can be reached even at a distance from the rolls that are applied perpendicularly to the running direction of the screen-belts. Pursuant to the invention, the rolls are operated via hydraulic-cylinder ram components; this makes it easy to adjust the original pressure individually without risking an overload of the screen-belt, due to the equalizing effect of the plate-shaped pressings on the pressure.
The adequately precise adjustment of the desired compressing pressure can be achieved by applying different compressing pressures. The known designs, which provide inflexibly applied plates to support the screen-belts, would significantly increase the abrasion of the screen-belts. By having the pressings, which are connected with the strap or the chain, rotate with the same speed as the screen-belts, the maximum protection ',,''~
"
:
,,. .. ,, . .. , ,, ~,, - . : . .. - . . . , ,- -'.,: - . -- : ,:-: .
.' , 20~i32~2 of the screen-belts under high compressing pressure is guaranteed.
In order to enable the safe application of high compressing pressures without an additional stiffening of the machine frame, the design provides for an inflexible connection of the cylinder ram components, which face each other perpendicularly to the running direction, and for a support at this inflexible connection. As a result, the press rolls support each other and the frame is not exposed to any additional load.
The pressings may have drainage grooves and/or drainage openings that are basically the same as the ones known from the existing flexible and elastic carrying belts. By using separate, inflexible pressings, the geometrical configuration of the openings and/or the drainage grooves can be better adjusted to the requirements, irrespective of the required flexibility of the strap or the chain. Naturally, the dimensions of the openings cannot be enlarged at will, otherwise the above-mentioned carrying belts could no longer carry out their supporting function. Conversely, with essentially inflexible, plate-shaped pressings it is easily possible to implement closely adjoining draining channels for the water that is pressed out of the substance, since the materials that can be used for the pressings are far more inflexible and rigid than the materials that can be used for a flexible carrying belt which rotates over rolls or drives.
In order to keep the required flexibility despite : the essentially inflexible, plate-shaped pressings, the design can be made in a way that provides for the pressings to be positioned in the longitudinal direction of the strap or the chain(s) at a distance from each other. On the one hand, this guarantees that the plate-shaped, inflexible pressings can be directed --. - .. : - . ........ , . . - :-; . , . ,~ : , : : , . .
... . . .. - . . . , , . ~ ................ .. . .
, , . . , .. : , . ~' .:: . . : :
2~32~2 safely over the fairleads without being over- stressed by excessive deflection, and on the other hand an additional drainage effect is gained between the adjacent pressings, which allows the water that is pressed out of the substance to escape freely and to flow off through the channels that have been formed this way.
The connection of the pressings with the strap or - the chains can be made removable. A very simple solution - 10 is the implementation of screws.
This kind of connection of the pressings with the strap or the chains allows for the choosing of the fixing on the strap or the chains in such a way that the joint for each plate is only lengthways to a line which runs perpendicularly to the running direction of the screen. As a result, acute-angled re-routings via fairleads and drive rolls become possible without ~ risking any damage to the pressings.
- In the following the invention is explained in detail by examples of operation which are shown schematically in the drawing. Figure 1 of this drawing ; shows a diagram of the screen-belt press pursuant to the invention. Figure 2 shows a detail view in an enlarged --scale of the press zone with the plate-shaped, inflexible pressings that support the screen-belts and that are carried by a flexible strap or a chain.
- Figures 3 and 4 show a diagram, similar to the one of figure 2, of various possible ways to connect the inflexible, plate-shaped pressings with a flexible strap. Figure 5 shows a diagram, analogous to the ones of the figures 3 and 4, of ways to connect the inflexible, plate-shaped pressings with a chain. Figure 6 shows a partial view in the direction of the arrow VI
of figure 5.
In the screen-belt press, which is shown in figure 1, supporting belts 1 that are formed by a flexible , ,. . .
::
. ' - ' . ' - . ' ~ '.... ' : ',:~ ' ' -' . ' - , ' ~ .
. ~ . ... . . ~. ' . , , ' ' ~
2~632~2 strap or a chain are provided for. These supporting belts are directed over fairleads 2 and they carry inflexible, plate-shaped pressings, which are described more specifically in the following figures, in order to support the screen-belts or filter-belts 3 which are directed over further fairleads 4 in addition to the fairleads 2. At least one of the fairleads 2 or 4 is equipped in the regular way with a drive in order to set in motion the supporting belt or the screen-belt that operates in direct connection with it. The exact location for placing the material that shall be drained, such as sludge, is marked with 5. The place where it is dropped after it went through the press zone, which runs mainly vertically pursuant to the shown example of operation, is marked with 6.
In the area of the fairleads 4, which are on the dropping side, scrapers 7 are provided for the cleaning of the belt; a more thorough cleaning can be conducted with the cleaning equipment 8, consisting of brushes and/or sprinklers, for example, which is schematically indicated. Further, operating press rolls 9 are schematically shown in the area of the press zone; these press rolls allow the controlled application of a compressing force on the screen belts or filter-belts 3 via hydraulic-cylinder ram components and by using the supporting belts 1 that carry the pressings.
In figure 2 the supporting belts that are formed by a flexible strap or a chain are again marked with 1, and they carry inflexible, plate-shaped pressings 10 that .
serve as a support fGr the screen-belts or filter-belts
3. The material to be drained between the filter-belts or s~reen-belts 3 is marked with 11. The several, inflexible, plate-shaped pressings are in the longitudinal direction of the strap or the chain 1 in a distance to each other which allows the safe re-routing via the fairleads or drive rolls 2 without any :
, . . .
~ .. : . .
2~32 ~2 deflection stress It is also possible to replace such distance, which improves the drainage of the liquid that is pressed out, by a design that provides for adequately rounded, adjacent side-faces of the pressings 10 in order to allow the re-routing motion over the fairleads 2; whereas the adjacent plates in the area of the press zone directly link up with each other, namely with their surfaces that face the filter-belts 3.
Press rolls 9 that can be applied separately via hydraulic cylinders 12 are provided for in order to ;allow for the application of a compressing force on the filter-belts by using the pressings 10.
The rolls 9 are mounted in adjustable bearings 13 that are schematically shown. In each case, two rolls that face each other are supported by a common cylinder system 12; this prevents any load on the frame from the outside. The surface of the rolls 9 can be, for example, rubberized. The use of inflexible, plate-shaped pressings 10 allows to design the flexible strap or ~;20 chain, which is used for the mounting support of the -pressings, adequately flexible since the applied pressure load is directly transmitted from the rolls 9 to the pressings 10. By using the plate-shaped pressings, surface pressures of approximately 0.5 bar to 5 bar on the filter-belts 3 can be reached. There is no relative motion between the pressings 10 and the filter-belts or screen-belts 3 due to the fact that the supporting belts l with the pressings 10 rotate with essentially the same speed as the filter-belts 3. As a result, the abrasion of the filter-belts is significantly reduced.
The figures 3 and 4 show various possible ways to connect the plate-shaped pressings 10 with a supporting -35 belt l that is formed by a flexible strap. Pursuant to figure 3, a threaded joint 14 is used so that the joint '', .
.~ .
... .. . . . . . . .
, . .. . : . . . .. ...
, ~
- . ' , - . -. . - , , :.
.
2~32~2 is only lengthways to a line which runs perpendicularly to the longitudinal direction of the strap l;
accordingly, safe re-routings are guaranteed. The threaded joint 14 can be replaced by a cam joint 15 which is shown in figure 4; also in this case the joint is lengthways to a line which runs perpendicularly to the longitudinal direction of the strap 1. The design, pursuant to figure 4, also shows drainage grooves 16 on the surface that faces the filter-belt; depending on the requirements, these grooves may run perpendicularly to the longitudinal direction or, in particular when the press zone is arranged vertically, tilted to the longitudinal direction of the strap in order to guarantee the proper drainage.
Apart from such drainage grooves, it is also ; possible to provide for openings to drain the liquid that is pressed out.
The design, pursuant to the figures 5 and 6, uses a -~ chain 1 as the supporting belt. The swivel axes of adjacent chain-links are marked with 17. The inflexible, plate-shaped pressings are again connected with a .~ threaded joint 14. The plan view of figure 6 shows schematically the drainage grooves 16 that run perpendicularly to the longitudinal axis of the chain 1.
Instead of the essentially vertical arrangement of the press zone, pursuant to the design shown in figure 1, it is also possible to provide for a press zone that is tilted to the horizontal line or that is essentially horizontal, depending on the requirements.
The rolls may be turned on pneumatically, hydraulically or mechanically. The screen-belt press may be operated continuously or intermittently.
'~
:.
:, , ': . :, -, , . . : , .
.. . . . ~ ..... ~
-, : . , . . . , . . -, . . . . .
, . . .
~ .. : . .
2~32 ~2 deflection stress It is also possible to replace such distance, which improves the drainage of the liquid that is pressed out, by a design that provides for adequately rounded, adjacent side-faces of the pressings 10 in order to allow the re-routing motion over the fairleads 2; whereas the adjacent plates in the area of the press zone directly link up with each other, namely with their surfaces that face the filter-belts 3.
Press rolls 9 that can be applied separately via hydraulic cylinders 12 are provided for in order to ;allow for the application of a compressing force on the filter-belts by using the pressings 10.
The rolls 9 are mounted in adjustable bearings 13 that are schematically shown. In each case, two rolls that face each other are supported by a common cylinder system 12; this prevents any load on the frame from the outside. The surface of the rolls 9 can be, for example, rubberized. The use of inflexible, plate-shaped pressings 10 allows to design the flexible strap or ~;20 chain, which is used for the mounting support of the -pressings, adequately flexible since the applied pressure load is directly transmitted from the rolls 9 to the pressings 10. By using the plate-shaped pressings, surface pressures of approximately 0.5 bar to 5 bar on the filter-belts 3 can be reached. There is no relative motion between the pressings 10 and the filter-belts or screen-belts 3 due to the fact that the supporting belts l with the pressings 10 rotate with essentially the same speed as the filter-belts 3. As a result, the abrasion of the filter-belts is significantly reduced.
The figures 3 and 4 show various possible ways to connect the plate-shaped pressings 10 with a supporting -35 belt l that is formed by a flexible strap. Pursuant to figure 3, a threaded joint 14 is used so that the joint '', .
.~ .
... .. . . . . . . .
, . .. . : . . . .. ...
, ~
- . ' , - . -. . - , , :.
.
2~32~2 is only lengthways to a line which runs perpendicularly to the longitudinal direction of the strap l;
accordingly, safe re-routings are guaranteed. The threaded joint 14 can be replaced by a cam joint 15 which is shown in figure 4; also in this case the joint is lengthways to a line which runs perpendicularly to the longitudinal direction of the strap 1. The design, pursuant to figure 4, also shows drainage grooves 16 on the surface that faces the filter-belt; depending on the requirements, these grooves may run perpendicularly to the longitudinal direction or, in particular when the press zone is arranged vertically, tilted to the longitudinal direction of the strap in order to guarantee the proper drainage.
Apart from such drainage grooves, it is also ; possible to provide for openings to drain the liquid that is pressed out.
The design, pursuant to the figures 5 and 6, uses a -~ chain 1 as the supporting belt. The swivel axes of adjacent chain-links are marked with 17. The inflexible, plate-shaped pressings are again connected with a .~ threaded joint 14. The plan view of figure 6 shows schematically the drainage grooves 16 that run perpendicularly to the longitudinal axis of the chain 1.
Instead of the essentially vertical arrangement of the press zone, pursuant to the design shown in figure 1, it is also possible to provide for a press zone that is tilted to the horizontal line or that is essentially horizontal, depending on the requirements.
The rolls may be turned on pneumatically, hydraulically or mechanically. The screen-belt press may be operated continuously or intermittently.
'~
:.
:, , ': . :, -, , . . : , .
.. . . . ~ ..... ~
-, : . , . . . , . . -, . . . . .
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A screen-belt press with rotating screen-belts (3), which can be pressed against each other, via a supporting belt (1), by rolls that can be applied perpendicularly to the running direction of the screen-belts (3) and the supporting belts; the supporting belts (1) have draining channels for the water of the substance that is pressed out by the screen-belts (3). The supporting belts (1) are formed by either a flexible strap or a chain; plate-shaped pressings (10) are connected with the flexible strap or the chain (1). Such a screen-belt press is characterized by the fact that the rolls (9) can be applied separately with different pressures via hydraulic-cylinder ram components (12).
2. The screen-belt press, pursuant to claim 1, is characterized by the fact that the cylinder ram components (12), which face each other perpendicularly to the running direction, are connected inflexibly with each other and that they are supported at the inflexible connection.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT99890 | 1990-05-02 | ||
| ATA998/90 | 1990-05-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2063252A1 true CA2063252A1 (en) | 1991-11-03 |
Family
ID=3504594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002063252A Abandoned CA2063252A1 (en) | 1990-05-02 | 1991-05-02 | Screen-belt press |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0481047A1 (en) |
| CA (1) | CA2063252A1 (en) |
| WO (1) | WO1991017041A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2735988A1 (en) * | 1995-06-27 | 1997-01-03 | Charbonnier Jean | Filtration of a suspension between two filter belts moving together |
| DE102009038360A1 (en) * | 2009-08-22 | 2011-02-24 | Claas Selbstfahrende Erntemaschinen Gmbh | Apparatus for dewatering biomass and harvesting vehicle using the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2281860A (en) * | 1939-05-27 | 1942-05-05 | Jean C Renault | Continuous feed and pressure press |
| GB1221742A (en) * | 1968-02-16 | 1971-02-10 | Willmes Josef Kg | Improvements in or relating to pressing filters |
| FR2416043A1 (en) * | 1978-02-06 | 1979-08-31 | Degremont Sa | Band filter - has endless band which is vibrated before passage through pressing rollers, used for dil. aq. sludges and is continuously washable |
-
1991
- 1991-05-02 EP EP91908738A patent/EP0481047A1/en not_active Withdrawn
- 1991-05-02 CA CA002063252A patent/CA2063252A1/en not_active Abandoned
- 1991-05-02 WO PCT/AT1991/000063 patent/WO1991017041A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0481047A1 (en) | 1992-04-22 |
| WO1991017041A1 (en) | 1991-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |