DK201670631A1 - A counter pressure system for a screw press with automatically adjusted counter pressure and a screw press comprising such a counter pressure system - Google Patents

A counter pressure system for a screw press with automatically adjusted counter pressure and a screw press comprising such a counter pressure system Download PDF

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Publication number
DK201670631A1
DK201670631A1 DKPA201670631A DKPA201670631A DK201670631A1 DK 201670631 A1 DK201670631 A1 DK 201670631A1 DK PA201670631 A DKPA201670631 A DK PA201670631A DK PA201670631 A DKPA201670631 A DK PA201670631A DK 201670631 A1 DK201670631 A1 DK 201670631A1
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DK
Denmark
Prior art keywords
counter pressure
pressure system
screw
press
counter
Prior art date
Application number
DKPA201670631A
Other languages
Danish (da)
Inventor
Søren Rossen Bech
Original Assignee
Runi As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Runi As filed Critical Runi As
Priority to DKPA201670631A priority Critical patent/DK201670631A1/en
Priority to PCT/DK2017/050265 priority patent/WO2018033192A1/en
Publication of DK201670631A1 publication Critical patent/DK201670631A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
    • B30B9/3003—Details
    • B30B9/3025—Extrusion chambers with adjustable outlet opening
    • 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
    • B30B9/12—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 pressing worms or screws co-operating with a permeable casing
    • B30B9/18—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 pressing worms or screws co-operating with a permeable casing with means for adjusting the outlet for the solid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
    • B30B9/3089—Extrusion presses

Abstract

A counter pressure system (6) for a screw press (l) for compaction of materials, such as for instance reusable waste products, is disclosed, which counter pressure comprises at least one moveable pressure jaw (8), the position of which determines the size of an opening through the counter pressure system through which the compacted material passes, wherein the counter pressure system is arranged so that the size of the opening and, thereby, the counter pressure exerted by the counter pressure system onto the material passing through it is automatically adjusted depending on the forward pressure exerted onto the material entering the counter pressure system by a press screw (7) of the screw press, of which the counter pressure system forms part, the adjustment being either a passive adjustment directly and mechanically depending on the pressure exerted by the press screw or an active adjustment based on a measurement of the same pressure.

Description

A COUNTER PRESSURE SYSTEM FOR A SCREW PRESS WITH AUTOMATICALLY ADJUSTED COUNTER PRESSURE AND A SCREW PRESS COMPRISING SUCH A COUNTER PRESSUREA COUNTER PRESSURE SYSTEM FOR A SCREW PRESS WITH AUTOMATICALLY ADJUSTED COUNTER PRESSURE AND A SCREW PRESS COMPRISING SUCH A COUNTER PRESSURE

SYSTEMSYSTEM

The present invention relates to a counter pressure system for a screw press for compaction of solid materials, such as for instance reusable waste products, and to a screw press comprising such a counter pressure system.The present invention relates to a counter pressure system for a compaction of solid materials, such as for instance reusable waste products, and to a screw press comprising such a counter pressure system.

Background of the inventionBackground of the invention

In order to obtain the desired compacting of solid materials in a screw press, some kind of resistance or friction creating means is needed to create a counter pressure working against the pressure applied by the screw onto the material to be compacted.In order to obtain the desired compacting of solid materials in a screw press, some kind of resistance or friction creating means is needed to create a counter pressure working against the pressure applied by the screw onto the material to be compacted.

One well-knowm way of obtaining such a counter pressure consists in the use of counter pressure systems with channel structures comprising one or more adjustable pressure jaws, the positionfs) of which determine(s) the internal cross-sectional area of the narrowest part of the channel structure and, thereby, the opening of the passageway through which the compacted material must pass. In this way, the created counter pressure can he regulated by adjusting the position(s) of the one or more pressure jaws.One well-known way of obtaining such a counter pressure consists in the use of counter pressure systems with channel structures comprising one or more adjustable pressure jaws, the positionfs) of which determine (s) the internal cross-sectional area of the narrowest part of the channel structure and, thereby, the opening of the passageway through which the compacted material must pass. In this way, the created counter pressure can be regulated by adjusting the position (s) of the one or more pressure jaws.

In order to ensure an appropriate and uniform compacting of the material passing through the screw press, it is important to keep the forward pressure exerted by the press screw relatively constant or at least within certain limits. It is known to use spring-loaded pressure jaws so that the counter pressure is reduced if the forward pressure exerted onto the pressure jaws by the compacted material exceeds a certain predefined level. However, such adjustment systems are inaccurate and insufficient, because the regulation of the counter pressure is not depending on the pressure exerted by the press screw' onto the material but on the pressure exerted by the material on the pressure jaw after passage of the counter pressure system.In order to ensure appropriate and uniform compacting of the material passing through the screw press, it is important to keep the forward pressure exerted by the press screw relatively constant or at least within certain limits. It is known to use spring-loaded pressure jaws so that the counter pressure is reduced if the forward pressure exerted onto the pressure jaws by the compacted material exceeds a certain predefined level. However, such adjustment systems are inaccurate and insufficient, because the regulation of the counter pressure is not dependent on the pressure exerted by the pressure screw on the material but on the pressure exerted by the material on the pressure even after passage of the counter pressure system.

Brief description of the inventionBrief description of the invention

It is an object of the present invention to provide a counter pressure system and a screw press, which overcome the above-mentioned, disadvantages related to counter pressure systems and screw presses known in the art.It is an object of the present invention to provide a counter pressure system and a screw press which overcome the above mentioned disadvantages related to counter pressure systems and screw presses known in the art.

The present invention relates to a counter pressure system for a screw press for compa ction of materials, such as for instance reusable waste products, which counter pressure comprises at least one moveable pressure jaw, the position of which determines the size of an opening through the counter pressure system through which the compacted material passes, wherein the counter pressure system is arranged so that the size of the opening and, thereby, the counter pressure exerted by the counter pressure system onto the material passing through it is automatically adjusted depending on the forward pressure exerted onto the material entering the counter pressure system by a press screw of a screw press, of which the counter pressure system forms part, and wherein the counter pressure adjustment is either a passive adjustment directly and mechanically depending on the forward pressure exerted by the press screw or an activ e adjustment based on a measurement of the forward pressure exerted by the press screw.The present invention relates to a counter pressure system for a screw press for compaction of materials, such as for instance reusable waste products, which counter pressure comprises at least one movable pressure jaw, the position of which determines the size of an opening through the counter pressure system through which the compacted material passes, the counter pressure system is arranged so that the size of the opening and, thereby, the counter pressure exerted by the counter pressure system onto the material passing through it is automatically adjusted depending on the forward pressure exerted onto the material entering the counter pressure system by a screw press of which the counter pressure system forms, and the counter pressure adjustment is either a passive adjustment directly and mechanically depending on the forward pressure exerted by the press screw or an active adjustment based on a measurement of the forward pressure exerted b y the press screw.

Counter pressure systems with counter pressure adjustment configured as in the present invention are advantageous, because the regulation of the counter pressure depends directly on the forward pressure exerted by the press screw' onto the material to be compacted.Counter pressure systems with counter pressure adjustment configured as in the present invention are advantageous because the regulation of the counter pressure depends directly on the forward pressure exerted by the press screw on the material to be compacted.

In an embodiment of the invention, the counter pressure system is arranged so that, when, the forward pressure exerted by the press screw exceeds a certain predefined level, the counter pressure system moves away from the remaining parts of the screw press in the axial direction of the press screw, and the position of the at least one pressure jaw changes in a direction increasing the size of the opening through the counter pressure system, whereby the counter pressure exerted by the at least one pressure jaw and thereby also the forward pressure exerted by the press screw is reduced and the counter pressure system moves back towards the remaining parts of the screw press again.In an embodiment of the invention, the counter pressure system is arranged so that, when the forward pressure exerted by the press screw exceeds a certain predefined level, the counter pressure system moves away from the remaining parts of the screw press in the axial direction. of the press screw, and the position of the at least one pressure jaw changes in a direction increasing the size of the opening through the counter pressure system, whereby the counter pressure exerted by the at least one pressure jaw and thereby also the forward pressure exerted the press screw is reduced and the counter pressure system moves back towards the remaining parts of the screw press again.

In an embodiment of the invention, the position of the counter pressure system relatively to the remaining parts of the screw' press is mechanically controlled at least partly by means of one or more springs with spring bolts fixed at one end to the remaining parts of the screw' press, which springs and spring bolts are arranged so that, when the counter pressure system is in its position closest to the remaining parts of the screw' press, the springs are in their most expanded position defining the predefined pressure level above which the counter pressure system moves aw'ay from the remaining parts of the screw press and, the position of the counter pressure system furthest away from the remaining parts of the screw press being defined by a mechanical stop.In an embodiment of the invention, the position of the counter pressure system relative to the remaining parts of the screw 'press is mechanically controlled at least partly by means of one or more springs with spring bolts fixed at one end to the remaining parts of the screw. screw 'press, which springs and spring bolts are arranged so that, when the counter pressure system is in its position closest to the remaining parts of the screw' press, the springs are in their most expanded position defining the predefined pressure level above which the counter pressure system moves aw'ay from the remaining parts of the screw press and, the position of the counter pressure system furthest away from the remaining parts of the screw press being defined by a mechanical stop.

The use of mechanical springs is relatively simple and reliable and it requires no electronic control and almost no maintenance.The use of mechanical springs is relatively simple and reliable and requires no electronic control and almost no maintenance.

In an embodiment of the invention , the position of the counter pressure system relatively' to the remaining parts of the screw' press is controlled at least partly by means of one or more hydraulic cylinders connected to a hydraulic accumulator in such a way that the hydraulic cylinders and the hydraulic accumulator together work as a hydraulic spring, the predefined pressure level above which the counter pressure system moves away from the remaining parts of the screw' press being defined by an air pressure within the hydraulic accumulator when the counter pressure system is in its position closest to the remaining parts of the screw' press.In an embodiment of the invention, the position of the counter pressure system relative to the remaining parts of the screw press is controlled at least in part by means of one or more hydraulic cylinders connected to a hydraulic accumulator in such a way that the hydraulic cylinders and the hydraulic accumulator work together as a hydraulic spring, the predefined pressure level above which the counter pressure system moves away from the remaining parts of the screw 'press being defined by an air pressure within the hydraulic accumulator when the counter pressure system is in its position closest to the remaining parts of the screw 'press.

Also the use of hydraulic springs is relatively simple and reliable and it requires no electronic control and almost no maintenance.Also the use of hydraulic springs is relatively simple and reliable and it requires no electronic control and almost no maintenance.

In an embodiment of the invention, the counter pressure system is supported by a support tower, the position relatively to the remaining parts of the screw press is fixed, and wherein the pressure jaw is rotatably connected to the remaining parts of the counter pressure system at one end and rotatably connected to a guide bar at the other end, and the guide bar is also rotatably connected to the support tower in such a way that, when the counter pressure system moves relatively to the support tower in a direction away from the remaining parts of the screw press, the guide bar forces the position of the pressure jaw to change in a direction increasing the size of the opening through the counter pressure system, and when the counter pressure system moves relatively to the support tower in a direction towards the remaining parts of the screw press, the guide bar forces the position of the pressure jaw to change in a direction narrowing the opening through the counter pressure system.In an embodiment of the invention, the counter pressure system is supported by a support tower, the position relative to the remaining parts of the screw press is fixed, and the pressure jaw is rotatably connected to the remaining parts of the counter pressure system at one end and rotatably connected to a guide bar at the other end, and the guide bar is also rotatably connected to the support tower in such a way that, when the counter pressure system moves relative to the support tower in a direction away from the remaining parts of the screw press, the guide bar forces the position of the pressure jaw to change in a direction increasing the size of the opening through the counter pressure system, and when the counter pressure system moves relative to the support tower in a direction towards the remaining parts of the screw press, the guide bar forces the position of the pressure jaw to change in a direction narrowing the opening through the counter pressure system.

Such a relatively simple mechanical coupling between the movement of the counter pressure system relatively to the remaining parts of the screw' press and the movement of the pressure jaw within the counter pressure system ensures a reliable and lasting function with small maintenance requirements.Such a relatively simple mechanical coupling between the movement of the counter pressure system relative to the remaining parts of the screw 'press and the movement of the pressure jaw within the counter pressure system ensures a reliable and lasting function with small maintenance requirements.

In an embodimen t of the invention, the length of the guide bar i s made variable, for instance through insertion of a spring load or a controlled actuator between its two connection points.In an embodiment of the invention, the length of the guide bar is made variable, for instance by inserting a spring load or a controlled actuator between its two connection points.

This is advantageous, for instance if the compacted material constitutes a significant resistance against the inward movement of the pressure jaw, which would otherwise prevent the movement of the counter pressure system towards the remaining parts of the screw' press.This is advantageous, for instance if the compacted material constitutes a significant resistance to the inward movement of the pressure jaw, which would otherwise prevent the movement of the counter pressure system towards the remaining parts of the screw 'press.

In an embodimen t of the invention, the position of the at least one pressure jaw is controlled by one or more hydraulic jaw' cylinders arranged between the one or more hydraulic cylinders controlling the position of the counter pressure system relatively to the remaining parts of the screw' and the hydraulic accumulator in such a way that, when the counter pressure system moves away from the remaining parts of the screw press, hydraulic oil moves between the one or more hydraulic cylinders controlling the position of the counter pressure system and the one or more hydraulic jaw cylinders causing the position of the pressure jaw to change in a direction increasing the size of the opening through the counter pressure system, and when the counter pressure system moves towards the remaining parts of the screw press, hydraulic oil moves between the one or more hydraulic cylinders controlling the position of the counter pressure system, and the one or more hydraulic jaw cylinders in the opposite direction causing the position of the pressure jaw to change in a direction narrowing the opening through the counter pressure system.In an embodiment of the invention, the position of the at least one pressure jaw is controlled by one or more hydraulic jaw cylinders arranged between the one or more hydraulic cylinders controlling the position of the counter pressure system relative to the remaining parts of the screw 'and the hydraulic accumulator in such a way that, when the counter pressure system moves away from the remaining parts of the screw press, hydraulic oil moves between the one or more hydraulic cylinders controlling the position of the counter pressure system and the one or more hydraulic jaw cylinders causing the position of the pressure jaw to change in a direction increasing the size of the opening through the counter pressure system, and when the counter pressure system moves towards the remaining parts of the screw press, hydraulic oil moves between the one or more hydraulic cylinders controlling the position of the counter pressure system, and the one or more hydraulic jaw cylinders in the opp osite direction causing the position of the pressure jaw to change in a direction narrowing the opening through the counter pressure system.

This embodiment combines the well-known and reliable use of hydraulic cylinders for controlling the position of pressure jaws with the above-described use of hydraulic springs for controlling the position of the counter pressure system relatively to the remaining parts of the screw press.This embodiment combines the well-known and reliable use of hydraulic cylinders for controlling the position of pressure jaws with the above-described use of hydraulic springs for controlling the position of the counter pressure system relative to the remaining parts of the screw press.

In an embodiment of the in vention, the counter pressure system further comprises one or more pressure sensors arranged to measure the pressure exerted onto the material entering the counter pressure system by the press screw and to send signals representative of the magnitude of the exerted pressure to one or more power sources, such as hydraulic cylinders, pneumatic cylinders or electric actuators, which power sources are arranged to control the position of the at least one pressure jaw depending on the received signals in accordance with predefined dependencies between the measured exerted pressures and the position of the at least one pressure jaws.In an embodiment of the in vention, the counter pressure system further comprises one or more pressure sensors arranged to measure the pressure exerted onto the material entering the counter pressure system by the press screw and to send signals representative of the magnitude of the exerted pressure to one or more power sources, such as hydraulic cylinders, pneumatic cylinders or electric actuators, which power sources are arranged to control the position of the at least one pressure jaw depending on the received signals in accordance with predefined dependencies between the measured exerted pressures and the position of the at least one pressure jaws.

This embodiment requires electronic control but reduces the number of moving parts, because the counter pressure system is stationary relatively to the remaining parts of the screw press.This embodiment requires electronic control but reduces the number of moving parts, because the counter pressure system is stationary relative to the remaining parts of the screw press.

In an aspect of the invention, it rel ates to a screw press for compaction of materials, such as for instance reusable waste products, comprising a counter pressure system as described above.In an aspect of the invention, it relates to a screw press for compaction of materials, such as for instance reusable waste products, comprising a counter pressure system as described above.

The drawingsThe drawings

In the following a few' exemplar}' embodiments of the invention are described in further detail with reference to the figures, of whichIn the following a few 'exemplar}' embodiments of the invention are described in further detail with reference to the figures, of which

Fig. 1 is a partly cross-sectional view of a screw' press according to an embodiment of the invention,FIG. 1 is a partial cross-sectional view of a screw press according to an embodiment of the invention,

Fig. 2 is a perspective view' of a counter pressure system for a screw' press according to an embodimen t of the invention.FIG. 2 is a perspective view of a counter pressure system for a screw press according to an embodiment of the invention.

Fig. 3a is a cross-sectional view' of the counter pressure system shown in Fig. 2 in a fully contracted position, andFIG. 3a is a cross-sectional view of the counter pressure system shown in FIG. 2 in a fully contracted position, and

Fig. 3b is a cross-sectional vi ew of the same counter pressure system in a fully expanded position.FIG. 3b is a cross-sectional vi of the same counter pressure system in a fully expanded position.

Detailed description of the inventionDetailed description of the invention

Fig. 1 is a partly cross-sectional view of a screw press 1 according to an embodiment of the invention. In the illustrated embodiment, the material to be compacted is filled into a hopper 3, from which it passes through a conical connection pail 5 into a counter pressure system 6 before leaving the screw press 1 in compacted form. In other embodiments, the connection part between the hopper 3 and the counter pressure system 6 may not be conical.FIG. 1 is a partial cross-sectional view of a screw press 1 according to an embodiment of the invention. In the illustrated embodiment, the material to be compacted is filled into a hopper 3 from which it passes through a conical connection pail 5 into a counter pressure system 6 before leaving the screw press 1 in compacted form. In other embodiments, the connection part between the hopper 3 and the counter pressure system 6 may not be conical.

An auger 4 within the hopper 3 and a press screw 7 within the conical connection, part 5 extending partly into the counter pressure system 6 is mounted on a common shaft for being rotated by an electric motor 2. The auger 4 moves the material to be compacted from the hopper 3 to the conical connection part 5 and the press screw 7 presses the material through the conical connection part 5 and further into the counter pressure system 6, in which a moveable pressure jaw 8 is used to vary the opening of the passage through the counter pressure system 6 and, thereby, the counter pressure exerted onto the material and the degree to which the material is compacted.An auger 4 within the hopper 3 and a press screw 7 within the conical connection, part 5 extending partially into the counter pressure system 6, is mounted on a common shaft for being rotated by an electric motor 2. The auger 4 moves the material to be compacted from the hopper 3 to the conical connection part 5 and the press screw 7 presses the material through the conical connection part 5 and further into the counter pressure system 6, in which a movable pressure jaw 8 is used to vary the opening of the passage through the counter pressure system 6 and, thereby, the counter pressure exerted onto the material and the degree to which the material is compacted.

Fig. 2 is a perspective view of a counter pressure system 6 for a screw press 1 according to an embodiment of the invention. In this embodiment, the counter pressure system 6 is supported by a support tower 9, the position of which is fixed relatively to the remaining parts of the screw press 1 (not shown in this figure), whereas the counter pressure system 6 is moveable relatively to the remaining parts of the screw press 1.FIG. 2 is a perspective view of a counter pressure system 6 for a screw press 1 according to an embodiment of the invention. In this embodiment, the counter pressure system 6 is supported by a support tower 9, the position of which is fixed relative to the remaining parts of the screw press 1 (not shown in this figure), whereas the counter pressure system 6 is relatively movable to the remaining parts of the screw press 1.

Two spring bolts 12 are fixed at one end to the remaining parts of the screw press 1 (typically to a conical connection part 5 as illustrated in Fig. I). The counter pressure system 6 can slide along the spring bolts 12 depending on the forward pressure exerted by the press screw 7 shown in Fig. .1 onto the material being compacted and, thereby, onto the counter pressure system 6.Two spring bolts 12 are fixed at one end to the remaining parts of the screw press 1 (typically to a conical connection part 5 as illustrated in Fig. I). The counter pressure system 6 can slide along the spring bolts 12 depending on the forward pressure exerted by the press screw 7 shown in FIG. .1 onto the material being compacted and thereby onto the counter pressure system 6.

When the forward pressure exerted by the press screw 7 exceeds a certain limit determined by the preload of the two springs 11 mounted around the spring bolts 12, the counter pressure system 6 moves in a direction away from the remaining parts of the screw press 1. The position furthest away from the remaining parts of the screw' press 1 is reached when the counter pressure system 6 reaches a mechanical stop (not shown). In the illustrated embodiment, the springs 11 are coil springs, but in principle any type of springs 11 may be used. A guide bar 10 is rotatably connected at one end to the fixed support tower 9 and at the other end to one end of the pressure jaw 8. The other end of the pressure jaw 8 is rotatably connected to the remaining parts of the coun ter pressure system 6.When the forward pressure exerted by the press screw 7 exceeds a certain limit determined by the preload of the two springs 11 mounted around the spring bolts 12, the counter pressure system 6 moves in a direction away from the remaining parts of the screw press 1. The position furthest away from the remaining parts of the screw 'press 1 is reached when the counter pressure system 6 reaches a mechanical stop (not shown). In the illustrated embodiment, the springs 11 are coil springs, but in principle any type of springs 11 may be used. A guide bar 10 is rotatably connected at one end to the fixed support tower 9 and at the other end to one end of the pressure jaw 8. The other end of the pressure jaw 8 is rotatably connected to the remaining parts of the counter pressure system 6.

Figs. 3a and 3b are cross-sectional views of the same counter pressure system 6 illustrating schematically the function thereof. in Fig. 3a, the counter pressure system 6 is in a fully contracted position, i.e. in the position closest possible to the conical connection part 5 of the screw press 1. The compression of the springs 12 in this position determines the pressure level above which the counter pressure system 6 will start moving away from the conical connection part 5. In this position, the pressure jaw 8 is in the position narrowing the opening of the passage through the counter pressure system 6 as much as possible, thereby exerting maximum counter pressure onto the material passing through the counter pressure system 6.Figs. 3a and 3b are cross-sectional views of the same counter pressure system 6 illustrating schematically the function thereof. in FIG. 3a, the counter pressure system 6 is in a fully contracted position, i.e. in the position closest to the conical connection part 5 of the screw press 1. The compression of the springs 12 in this position determines the pressure level above which the counter pressure system 6 will start moving away from the conical connection part 5. In this position, the pressure jaw 8 is in the position of narrowing the opening of the passage through the counter pressure system 6 as much as possible, thereby exerting maximum counter pressure to the material passing through the counter pressure system 6.

In Fig. 3b, on the other hand, the counter pressure system 6 is in a fully expanded position, i.e. the position furthest away from the conical connection part 5 of the screw press 1. This position is reached when the counter pressure system 6 reaches a mechanical stop (not shown). The axial motion of the counter pressure system 6 relatively to the remaining parts of the screw' press l including the support tower 9 has caused the guide bar 10 to rotate into a more horizontal position thereby lifting the pressure jaw 8 and increasing the size of the opening of the passage through the counter pressure system 6.In FIG. 3b, on the other hand, the counter pressure system 6 is in a fully expanded position, i.e. the position furthest away from the conical connection part 5 of the screw press 1. This position is reached when the counter pressure system 6 reaches a mechanical stop (not shown). The axial motion of the counter pressure system 6 relative to the remaining parts of the screw press l including the support tower 9 has caused the guide bar 10 to rotate into a more horizontal position thereby lifting the pressure jaw 8 and increasing the size of the screw. opening of the passage through the counter pressure system 6.

The increased size of the opening reduces the counter pressure exerted on to the material passing through the counter pressure system 6 and, thereby, the pressure exerted by the press screw 7 onto the material for pushing it through. This, in turn., causes the counter pressure system 6 to move back towards the remaining parts of the screw' press 1, thereby causing the pressure jaw 8 to rotate and narrow the opening through the coun ter pressure system 6. Thus an increase of the forward pressure exerted by the press screw 7 immediately results in a reduction of the counter pressures exerted by the counter pressure system 6 and vice versa , and a direct and reliable regulation of the pressure exerted by the press screw 7 is obtained.The increased size of the opening reduces the counter pressure exerted on the material passing through the counter pressure system 6 and, thereby, the pressure exerted by the press screw 7 onto the material for pushing it through. This, in turn, causes the counter pressure system 6 to move back toward the remaining parts of the screw 'press 1, thereby causing the pressure jaw 8 to rotate and narrow the opening through the counter pressure system 6. Thus, an increase of The forward pressure exerted by the press screw 7 immediately results in a reduction of the counter pressure exerted by the counter pressure system 6 and vice versa, and a direct and reliable regulation of the pressure exerted by the press screw 7 is obtained.

In other embodiment of the invention (not illustrated), the springs 11 and spring bolts 12 may be replaced by on ore more hydraulic cylinders, which are pushed in or out when the counter pressure system 6 moves relatively to the remaining parts of the screw press 1. The displaced hydraulic oil is conducted in hoses to an air-filled hydraulic accumulator, the air pressure within which determined the pressure level above which the counter pressure system 6 starts to move. In yet other embodiments, one or more hydraulic jaw cylinders are arranged between the hydraulic cylinders controlling the position of the co un ter pressure system 6 an d the hydraulic accumulator in a so-called master-slave configuration so that a movement of the counter pressure system 6 causes hydraulic oil to be displaced between the hydraulic cylinders so that this motion is directly connected to a movement of the pressure jaw 8. In this case, one hydraulic port of a hydraulic jaw cylinder is connected to a hydraulic port of a hydraulic cylinder controlling the position of the counter pressure system, whereas the other hydraulic port of the hydraulic jaw' cylinder is connected to the hydraulic accumulator, which ensures a hydraulic spring function for both the hydraulic jaw cylinders and the hydraulic cylinders controlling the position of the counter pressure system 6.In another embodiment of the invention (not illustrated), the springs 11 and spring bolts 12 may be replaced by ore more hydraulic cylinders, which are pushed in or out when the counter pressure system 6 moves relative to the remaining parts of the screw press. 1. The displaced hydraulic oil is conducted in hoses to an air-filled hydraulic accumulator, the air pressure within which determines the pressure level above which the counter pressure system 6 starts to move. In yet other embodiments, one or more hydraulic jaw cylinders are arranged between the hydraulic cylinders controlling the position of the co un ter pressure system 6 an d the hydraulic accumulator in a so-called master-slave configuration such that a movement of the counter pressure system 6 causes hydraulic oil to be displaced between the hydraulic cylinders so that this motion is directly connected to a movement of the pressure jaw 8. In this case, one hydraulic port of a hydraulic jaw cylinder is connected to a hydraulic port of a hydraulic cylinder controlling the position of the counter pressure system, whereas the other hydraulic port of the hydraulic jaw 'cylinder is connected to the hydraulic accumulator, which ensures a hydraulic spring function for both the hydraulic jaw cylinders and the hydraulic cylinders controlling the position of the counter pressure system 6.

Other embodiment of the invention (not illustrated) include electronic control of one or more power sources, for instance in the form of hydraulic cylinders, pneumatic cylinders or electric actuators, regulating the position of the one or more pressure jaws 8, on the basis of electric signals representing the forward pressure exerted by the press screw 1 onto the material to be compacted. This pressure may, for instance, be measured by one or more pressure sensors arranged between the counter pressure system 6 and the remaining parts of the screw press 1.Other embodiments of the invention (not illustrated) include electronic control of one or more power sources, for instance in the form of hydraulic cylinders, pneumatic cylinders or electric actuators, regulating the position of the one or more pressure jaws 8, on the basis of electric signals representing the forward pressure exerted by the press screw 1 onto the material to be compacted. This pressure may, for instance, be measured by one or more pressure sensors arranged between the counter pressure system 6 and the remaining parts of the screw press 1.

List of reference numbers 1. Screw press 2. Electric motor 3. Hopper 4. Auger 5. Conical connection part 6. Counter pressure system 7. Press screw 8. Pressure jaw 9. Support tower for counter pressure system 10. Guide bar for pressure jaw 11. Spring 12. Spring boltList of reference numbers 1. Screw press 2. Electric motor 3. Hopper 4. Auger 5. Conical connection part 6. Counter pressure system 7. Press screw 8. Pressure jaw 9. Support tower for counter pressure system 10. Guide bar for pressure jaw 11. Spring 12. Spring bolt

Claims (9)

  1. Claims
    1. A counter pressure system (6) for a screw press (1) for compaction of materials, such as for instance reusable waste products, which counter pressure comprises at least one moveable pressure jaw (8), the position of which determines the size of an opening through the counter pressure system through which the compacted material passes, wherein the counter pressure system is arranged so that the size of the opening and, thereby, the counter pressure exerted by the counter pressure system onto the material passing through it is automatically adjusted depending on the forward pressure exerted onto the material entering the counter pressure system by a press screw (7 ) of a screw press, of which the counter pressure system forms part, and wherein the counter pressure adjustment is either a passive adjustment directly and mechanically depending on the forward pressure exerted by the press screw or an active adjustment based on a measurement of the forward pressure exerted by the press screw.
  2. 2. The counter pressure system according to claim 1, wherein the counter pressure system is arranged so that, when the forw'ard pressure exerted by the press screw' (7) exceeds a certain predefined level, the counter pressure system moves away from the remaining parts of the screw' press in the axial direction of the press screw', and the position of the at least one pressure jaw changes in a direction increasing the size of the opening through the counter pressure system, whereby the counter pressure exerted by the at least one pressure jaw and thereby also the forward pressure exerted by the press screw is reduced and the counter pressure system moves back towards the remaining parts of the screw' press again,
  3. 3. The counter pressure system according to claim 2, wherein the position of the counter pressure system relatively to the remaining parts of the screw press is
    DK 2016 70631 A1 mechanically controlled at least partly by means of one or more springs (1Γ) with spring bolts (12) fixed at one end to the remaining parts of the screw press, which springs and spring bolts are arranged so that, when the counter pressure system is in its position closest to the remaining parts of the screw press, the springs are in their most expanded position defining the predefined pressure level above which the counter pressure system moves away from the remaining parts of the screw press an d, the position of the counter pressure system furthest away from the remaining parts of the screw press being defined by a. mechanical stop.
  4. 4. The counter pressure system according to claim 2, wherein the position of the counter pressure system relatively to the remaining parts of the screw press is controlled at least partly by means of one or more hydraulic cylinders connected to a hydraulic accumulator in such a way that the hydraulic cylinders and the hydraulic accumulator together work as a hydraulic spring, the predefined pressure level above which the counter pressure system moves away from the remaining parts of the screw press being defined by an air pressure within the hydraulic accumulator when the counter pressure system is in its position closest to the remaining parts of the screw press.
  5. 5. The counter pressure system according to any of claims 2-4, wherein the counter pressure system is supported by a support tower (9), the position relatively to the remaining parts of the screw press is fixed, and wherein the pressure jaw is rotatably connected to the remaining parts of the counter pressure system at one end and rotatably connected to a guide bar (10) at the other end, and the guide bar is also rotatably connected to the support tower in such a way that,
    DK 2016 70631 A1 when the counter pressure system moves relatively to the support tower in a direction away from the remaining parts of the screw press, the guide bar forces the position of the pressure jaw to change in a direction increasing the size of the opening through the counter pressure system, and when the counter pressure system moves relatively to the support tower in a direction towards the remaining parts of the screw press, the guide bar forces the position of the pressure jaw to change in a direction narrowing the opening through the counter pressure system.
  6. 6. The counter pressure system according to claim 5, wherein the length of the guide bar is made variable, for instance through insertion of a spring load or a controlled actuator between its two connection points.
  7. 7. The counter pressure system according to claim 4, wherein the position of the at least one pressure jaw is controlled by one or more hydraulic jaw cylinders arranged between the one or more hydraulic cylinders controlling the position of the counter pressure system relatively to the remaining parts of the screw and the hydraulic accumulator in such a way that, when the counter pressure system moves away from the remaining parts of the screw press, hydraulic oil moves between the one or more hydraulic cylinders controlling the position of the counter pressure system and the one or more hydraulic jaw cylinders causing the position of the pressure jaw to change in a direction increasing the size of the opening through the counter pressure system, and when the counter pressure system moves towards the remaining parts of the screw press, hydraulic oil moves between the one or more hydraulic cylinders controlling the position of the counter pressure system and the one or more hydraulic jaw cylinders in the opposite direction causing the position of the pressure jaw to change in a direction narrowing the opening through the counter pressure system.
    DK 2016 70631 A1
  8. 8. The counter pressure system according to claim 1, further comprising one or more pressure sensors arranged to measure the pressure exerted onto the material entering the counter pressure system by the press screw and to send signals
    5 representative of the magnitude of the exerted press ure to one or more power sources, such as hydraulic cylinders, pneumatic cylinders or electric actuators, which power sources are arranged to control the position of the at least one pressure jaw7 depending on the received signals in accordance with predefined dependencies between the measured exerted pressures and the position of the at least one pressure
    10 jaws.
  9. 9. A screw7 press (1) for compaction of materials, such as for instance reusable waste products, which screw press comprises a counter pressure system (6) according to any of the preceding claims.
    DK 2016 70631 A1 Df^20l6 70631
    A1
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    DK 2016 70631 A1 rø cn
    DK 2016 70631 A1 m
    ώ
    SEARCH REPORT - PATENT Application No. PA 2016 70631 A. CLASSIFICATION OF SUBJECT MATTER B30B 9/18 (2006.01) According to International Patent Classification (IPC) B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) IPC: B30B, A01F; CPC: B30B, A01F; FICLA: B30B, A01F Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched DK, NO, SE, FE IPC-classes as above. Electronic database consulted during the search (name of database and, where practicable, search terms used) EPODOC, WPI, English language full-text patent databases C. DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant for claims No. X WO 2007/057293 Al (CMS SPA) 24 May 2007 1,8,9 See in particular the abstract, page 2, from page 3 line 27 to page 7 line 30, figures 1 and 2 X GB 2306132 A (MARSHALL) 30 April 1997 1 X EP 0662043 Al (MARSHALL) 12 July 1995 1 X WO 2004/067270 A2 (KURT MANUFACTURING) 12 August 2004 1 M Further documents are listed in the continuation of Box C. * Special categories of cited documents: P Document published prior to the filing date but later than the A Document defining the general state of the art which is not priority date claimed. considered to be of particular relevance. T Document not in conflict with the application but cited to D Document cited in the application. E Earlier application or patent but published on or after the filing date. understand the principle or theory underlying the invention. X Document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone. Y Document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such L Document which may throw doubt on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified). O Document referring to an oral disclosure, use, exhibition or other means. combination being obvious to a person skilled in the art. Document member of the same patent family. Danish Patent and Trademark Office Date of completion of the search report Helgeshøj Allé 81 DK-2630 Taastrun 17 February 2017 Denmark Authorized officer Telephone No. +45 4350 8000 Facsimile No. +45 4350 8001 Sven Nytoft Rasmussen, M. Sc. Eng., Ph. D. Telephone No. +45 4350 8427
    Search Report
    SEARCH REPORT - PATENT Application No. PA 2016 70631 C (Continuation). DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant for claim No. X DK 9500220U U3 (DYSAGER KRISTENSEN, N.) 28 July 1995 1 X US 2014/0326148 Al (WOOTTON, P. et al.) 6 November 2014 1 X DE 4232449 Al (FAN ENGINEERING) 31 March 1994 1 X DE 4041541 Al (FAN ENGINEERING) 25 June 1992 1 X US 2015/0224428 Al (LEHOUX, R. et al.) 13 August 2015 1 X DE 202005014151U Ul (STRAUTMANN MASCHINENBAU) 18 January 2007 1 X US 3989433 A (FURMAN, A.) 2 November 1976 1 X US 4049390 A (FURMAN, A.) 20 September 1977 1
    Search Report
DKPA201670631A 2016-08-17 2016-08-17 A counter pressure system for a screw press with automatically adjusted counter pressure and a screw press comprising such a counter pressure system DK201670631A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DKPA201670631A DK201670631A1 (en) 2016-08-17 2016-08-17 A counter pressure system for a screw press with automatically adjusted counter pressure and a screw press comprising such a counter pressure system
PCT/DK2017/050265 WO2018033192A1 (en) 2016-08-17 2017-08-16 A counter pressure system for a screw press with automatically adjusted counter pressure and a screw press comprising such a counter pressure system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DKPA201670631A DK201670631A1 (en) 2016-08-17 2016-08-17 A counter pressure system for a screw press with automatically adjusted counter pressure and a screw press comprising such a counter pressure system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4294618A1 (en) * 2021-02-19 2023-12-27 Shark Containers A/S A compactor and a method for compacting the waste material to a block as a function of temperature and hardness

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US4049390A (en) * 1974-11-18 1977-09-20 General Electric Company Method for extrusion of coal containing body
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DK9500220U3 (en) * 1995-06-06 1995-07-28 Kristensen Niels Dysager Adjustable snail compressor holding device
GB2306132A (en) * 1992-09-26 1997-04-30 Marshall Spv Ltd Compaction apparatus
WO2004067270A2 (en) * 2003-01-29 2004-08-12 Kurt Manufacturing Company, Inc. Material compaction apparatus
DE202005014151U1 (en) * 2005-09-07 2007-01-18 Strautmann Maschinenbau Gmbh Material compacting method e.g. for material in recycling, involves having material which can be compacted and moved to compressing area with material compressed in compressing area radially from outside to inside
WO2007057293A1 (en) * 2005-11-15 2007-05-24 C.M.S. S.P.A. Apparatus for automatically regulating the action of the constriction means arranged on the discharge mouth of screw presses
US20140326148A1 (en) * 2011-09-06 2014-11-06 Anaeco Limited Dewatering method and apparatus
US20150224428A1 (en) * 2013-12-05 2015-08-13 Greenfield Specialty Alcohols Inc. Backpressure control for solid/fluid separation apparatus

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GB1170315A (en) * 1967-03-02 1969-11-12 Stork & Co Nv Improvements in and relating to a Low Pressure Fruit Press, particularly for Oil Palm Fruits
SE447917B (en) * 1985-05-10 1986-12-22 Tad Glowacki SCREW PRESSURE FOR DRAINING SLAM AND FIBER SUSPENSIONS
US5012731A (en) * 1985-06-26 1991-05-07 Yves Maisonneuve Device for pressing heterogeneous mixtures with regulated pressing force for separating liquid and solid fractions thereof, in particular fruit juices

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US3989433A (en) * 1974-11-18 1976-11-02 General Electric Company Apparatus for controlling resistance to extrusion of a rod-like body through a die
US4049390A (en) * 1974-11-18 1977-09-20 General Electric Company Method for extrusion of coal containing body
DE4041541A1 (en) * 1990-12-22 1992-06-25 Fan Engineering Gmbh Plug dewatering control appts. for solid liq. sepn. - useful for compression screw separator for animal dung, comprises motor displaceable wt. on flap lever arm, avoiding perturbation
EP0662043A1 (en) * 1992-09-26 1995-07-12 Marshall Spv Ltd Compaction methods and apparatus.
GB2306132A (en) * 1992-09-26 1997-04-30 Marshall Spv Ltd Compaction apparatus
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DK9500220U3 (en) * 1995-06-06 1995-07-28 Kristensen Niels Dysager Adjustable snail compressor holding device
WO2004067270A2 (en) * 2003-01-29 2004-08-12 Kurt Manufacturing Company, Inc. Material compaction apparatus
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WO2007057293A1 (en) * 2005-11-15 2007-05-24 C.M.S. S.P.A. Apparatus for automatically regulating the action of the constriction means arranged on the discharge mouth of screw presses
US20140326148A1 (en) * 2011-09-06 2014-11-06 Anaeco Limited Dewatering method and apparatus
US20150224428A1 (en) * 2013-12-05 2015-08-13 Greenfield Specialty Alcohols Inc. Backpressure control for solid/fluid separation apparatus

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