CA3096277A1 - Screening device - Google Patents
Screening device Download PDFInfo
- Publication number
- CA3096277A1 CA3096277A1 CA3096277A CA3096277A CA3096277A1 CA 3096277 A1 CA3096277 A1 CA 3096277A1 CA 3096277 A CA3096277 A CA 3096277A CA 3096277 A CA3096277 A CA 3096277A CA 3096277 A1 CA3096277 A1 CA 3096277A1
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- CA
- Canada
- Prior art keywords
- screening device
- screening
- bars
- profile
- screen
- 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.)
- Pending
Links
- 238000012216 screening Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000011282 treatment Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 244000110633 Yucca schidigera Species 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/12—Apparatus having only parallel elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/16—Cylinders and plates for screens
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention relates to a screening device, which is preferably in the form of a screening basket. Such screening devices are used, for example, in classifying processes in the paper industry. Screening slots or screening gaps are formed between adjacent profiled screening bars. The screening bars are held at the foot regions thereof in holding cut-outs of support elements and permanently fastened thereto, said holding cut-outs being matched to the foot region geometry. The profiled bars are arranged in such a way that, with constant slot width between adjacent profiled bars in the screening basket axial direction, the profile depth increases from the material inlet side to the reject outlet side, and the diameter of the screening device is greater on the material inlet side than on the reject outlet side.
Description
SCREENING DEVICE
Description The invention is concerned with a screening device, which is preferably designed in the form of a screen basket, wherein the screening device has screening slots or screening gaps which are formed between profiled screen bars, and the screen bars are received at their foot area in receiving recesses of support elements, with the receiving recesses suited to the foot area geometry, and are permanently attached to the support elements.
Such screening devices are also referred to as "bar screen devices". These screening devices can be designed in a flat shape as screening plates or in a rounded shape as screen baskets.
DE 10 2014 011 679 Al discloses profiled screen bars and screening devices, which are preferably designed in the form of a screen basket. These devices have specially profiled screen bars in such a way that the respective radii upstream and downstream of the slot-generating flanks in the head area of the screen bar have a common center point. The screening device produced from such screen bars is cylindrical and can be subdivided into segments or regions viewed in axial direction, with the regions with different profile depths respectively, always having an essentially constant slot width. The production of these specially designed screen bars and their head area are complex, and hence there is a need for a more cost-effective production of screening devices of the type involved here.
DE 196 09 316 C2 discloses a method for the production of a screening device with controlled, uneven sorting slots as well as screening devices and their use.
The adjustability of the profile depth in a cylindrical bar screen basket is known therefrom.
The screen basket has variable slot widths and/or different profile depths, wherein Date Recue/Date Received 2020-10-06 WO 2020/007499 CA ei0962/1 2020-10-06 both core sizes can be varied at all times. A screening device, preferably in the form of a screen basket with a cylindrical configuration, is created from these known profile bars.
Finally, DE 44 32 842 Al discloses a sorting device with a conical configuration, with the slot widths varying in the direction of the flow path from the stock inlet side to the reject outlet side in such a way that the slot width becomes smaller in the direction of the flow path from the stock inlet side to the reject outlet side.
The aim of the invention is therefore to provide a screening device made of conventional screen bars, which have a triangular profile, for example, in which the sorting efficiency is improved, a low tendency towards clogging is established, and higher throughput rates can be achieved as a more gentle sorting process can be realized overall According to the invention, a screening device is provided for this purpose, preferably in the form of a screen basket, with screening slots or screening gaps formed between profiled screen bars, in which screening device the screen bars are received at their foot area in receiving recesses of support elements, with the receiving recesses suited to the foot area geometry, and are permanently attached to the support elements, and which screening device is characterized in that the profile bars are arranged in such a way that with a constant slot width between adjacent profile bars in axial direction of the screen basket, the profile depth increases from the stock inlet side to the reject outlet side, and that the diameter of the screening device on the stock inlet side is greater than on the reject outlet side.
The screening device according to the invention is configured in such a way that different profile depths and/or different angles of a tangent to the outer surface of the screen device are established, but essentially a constant slot width is available, so as to be able to realize in the throughput direction of the screening device from the stock
Description The invention is concerned with a screening device, which is preferably designed in the form of a screen basket, wherein the screening device has screening slots or screening gaps which are formed between profiled screen bars, and the screen bars are received at their foot area in receiving recesses of support elements, with the receiving recesses suited to the foot area geometry, and are permanently attached to the support elements.
Such screening devices are also referred to as "bar screen devices". These screening devices can be designed in a flat shape as screening plates or in a rounded shape as screen baskets.
DE 10 2014 011 679 Al discloses profiled screen bars and screening devices, which are preferably designed in the form of a screen basket. These devices have specially profiled screen bars in such a way that the respective radii upstream and downstream of the slot-generating flanks in the head area of the screen bar have a common center point. The screening device produced from such screen bars is cylindrical and can be subdivided into segments or regions viewed in axial direction, with the regions with different profile depths respectively, always having an essentially constant slot width. The production of these specially designed screen bars and their head area are complex, and hence there is a need for a more cost-effective production of screening devices of the type involved here.
DE 196 09 316 C2 discloses a method for the production of a screening device with controlled, uneven sorting slots as well as screening devices and their use.
The adjustability of the profile depth in a cylindrical bar screen basket is known therefrom.
The screen basket has variable slot widths and/or different profile depths, wherein Date Recue/Date Received 2020-10-06 WO 2020/007499 CA ei0962/1 2020-10-06 both core sizes can be varied at all times. A screening device, preferably in the form of a screen basket with a cylindrical configuration, is created from these known profile bars.
Finally, DE 44 32 842 Al discloses a sorting device with a conical configuration, with the slot widths varying in the direction of the flow path from the stock inlet side to the reject outlet side in such a way that the slot width becomes smaller in the direction of the flow path from the stock inlet side to the reject outlet side.
The aim of the invention is therefore to provide a screening device made of conventional screen bars, which have a triangular profile, for example, in which the sorting efficiency is improved, a low tendency towards clogging is established, and higher throughput rates can be achieved as a more gentle sorting process can be realized overall According to the invention, a screening device is provided for this purpose, preferably in the form of a screen basket, with screening slots or screening gaps formed between profiled screen bars, in which screening device the screen bars are received at their foot area in receiving recesses of support elements, with the receiving recesses suited to the foot area geometry, and are permanently attached to the support elements, and which screening device is characterized in that the profile bars are arranged in such a way that with a constant slot width between adjacent profile bars in axial direction of the screen basket, the profile depth increases from the stock inlet side to the reject outlet side, and that the diameter of the screening device on the stock inlet side is greater than on the reject outlet side.
The screening device according to the invention is configured in such a way that different profile depths and/or different angles of a tangent to the outer surface of the screen device are established, but essentially a constant slot width is available, so as to be able to realize in the throughput direction of the screening device from the stock
2 Date Recue/Date Received 2020-10-06 inlet side to the reject outlet side screening or sorting treatments with different implementation conditions. As a result, higher throughput rates can be realized and, in particular, an improved sorting efficiency is obtained. In the screening device according to the invention, the screen bars have a common profile and are, for example, triangular in profile.
When, in the invention, the screen bar in the upper area of the screen basket is shallower or has a smaller profile depth, smaller flow eddies, less turbulence are obtained and the likelihood of dirt particles being pressed through the screening slots or screening gaps is reduced. Thus, the screening device according to the invention attains an overall more efficient and gentle sorting process.
The thickening of the fiber suspension increases steadily in the direction of the reject outlet side. To prevent the sorting process from coming to a standstill due to the risk of clogging, a greater profile depth is realized in the area in direction of the reject outlet side. As a result, the turbulences can be increased in this region, paper fibers in the suspension can be better fluidized, and the tendency to clogging decreases. In the region towards the reject outlet side, the dirt load is also thickened and concentrated. This dirt load increases wear, so that the greater profile depth in this region increases the volume of material in the flow, thereby improving the creep strength and increasing the service life of the profile or screen basket.
According to preferred embodiments, the profile depth can increase continuously starting from the stock inlet side to the reject outlet side. As an alternative, the profile depth can increase incrementally from the stock inlet side to the reject outlet side.
According to preferred embodiments of screening devices, the screen bars can be aligned axially to the screen basket axis, or alternatively be aligned linearly inclined to the screen axis. Or, according to a further preferred embodiment, the screen bars can be aligned discontinuously curved with respect to the screen basket axis.
The
When, in the invention, the screen bar in the upper area of the screen basket is shallower or has a smaller profile depth, smaller flow eddies, less turbulence are obtained and the likelihood of dirt particles being pressed through the screening slots or screening gaps is reduced. Thus, the screening device according to the invention attains an overall more efficient and gentle sorting process.
The thickening of the fiber suspension increases steadily in the direction of the reject outlet side. To prevent the sorting process from coming to a standstill due to the risk of clogging, a greater profile depth is realized in the area in direction of the reject outlet side. As a result, the turbulences can be increased in this region, paper fibers in the suspension can be better fluidized, and the tendency to clogging decreases. In the region towards the reject outlet side, the dirt load is also thickened and concentrated. This dirt load increases wear, so that the greater profile depth in this region increases the volume of material in the flow, thereby improving the creep strength and increasing the service life of the profile or screen basket.
According to preferred embodiments, the profile depth can increase continuously starting from the stock inlet side to the reject outlet side. As an alternative, the profile depth can increase incrementally from the stock inlet side to the reject outlet side.
According to preferred embodiments of screening devices, the screen bars can be aligned axially to the screen basket axis, or alternatively be aligned linearly inclined to the screen axis. Or, according to a further preferred embodiment, the screen bars can be aligned discontinuously curved with respect to the screen basket axis.
The
3 Date Recue/Date Received 2020-10-06 alignment of the screen bars is chosen according to requirements and in accordance with the screening tasks and the screening treatments.
In particular, the profile bars have an essentially triangular profile. The slot width can be in a range from 0.05 mm to 0.8 mm, preferably from 0.1 mm to 0.4 mm.
The profile bar width is preferably in a range from 2.0 mm to 8 mm, and preferably between 2.0 mm and 4.0 mm.
The invention will be explained in more detail hereinafter on the basis of preferred embodiments with reference to the accompanying drawing, without any limiting character. The drawing shows in:
Fig. 1 a schematic view of a screen basket according to the invention with at least two different screening regions between stock inlet side (inflow) and a reject outlet side (reject);
Fig. 2 a schematic sectional view of a screen basket according to Fig. 1 in cooperation with a rotor equipped with blades;
Fig. 3 a schematic sectional view of another configuration of a screening device in cooperation with a likewise conically configured rotor;
Fig. 4 a schematic view of a detail of a screening device in which the screen bars are aligned axially to the screen basket axis;
Fig. 5 a further preferred embodiment of a variant of a screening device in which the screen bars are aligned linearly inclined with respect to the screen basket axis; and
In particular, the profile bars have an essentially triangular profile. The slot width can be in a range from 0.05 mm to 0.8 mm, preferably from 0.1 mm to 0.4 mm.
The profile bar width is preferably in a range from 2.0 mm to 8 mm, and preferably between 2.0 mm and 4.0 mm.
The invention will be explained in more detail hereinafter on the basis of preferred embodiments with reference to the accompanying drawing, without any limiting character. The drawing shows in:
Fig. 1 a schematic view of a screen basket according to the invention with at least two different screening regions between stock inlet side (inflow) and a reject outlet side (reject);
Fig. 2 a schematic sectional view of a screen basket according to Fig. 1 in cooperation with a rotor equipped with blades;
Fig. 3 a schematic sectional view of another configuration of a screening device in cooperation with a likewise conically configured rotor;
Fig. 4 a schematic view of a detail of a screening device in which the screen bars are aligned axially to the screen basket axis;
Fig. 5 a further preferred embodiment of a variant of a screening device in which the screen bars are aligned linearly inclined with respect to the screen basket axis; and
4 Date Recue/Date Received 2020-10-06 Fig. 6 a schematic view of a detail of a variant of a screening device in which the screen bars are aligned discontinuously curved with respect to the screen basket axis.
In the figures of the drawing, same or similar parts are provided with the same reference signs.
Fig. 1 shows an exemplary embodiment of a screening device, generally designated with 1 and subdivided into at least two different treatment zones A, B in through flow direction from the stock inlet side (inflow) to the reject outlet side (reject). The inflow on the stock inlet side 2 and the reject on the reject outlet side 3 are indicated by arrows. The flow direction of the accepted stock is also indicated by arrows in conjunction with the designation "Accept".
On the right-hand side of Fig. 1, the corresponding arrangement of profile bars 4 is illustrated by way of an enlarged detail illustration next to the treatment zones A, B.
As can be seen overall from Fig. 1, the profile bars 4 are arranged in such a way that with a constant slot width w between adjacent profile bars 4 in axial direction of the screen basket, the profile depth t increases from the stock inlet side to the reject outlet side, and the diameter of the screening device 1 on the stock inlet side 2 is greater than on the reject outlet side 3. The screening device 1 according to the invention is thus configured conically in a predetermined manner and in such a way that the diameter of the stock inlet side 2 is greater than on the reject outlet side 3.
Illustrated in treatment zone A are three screen bars 4 lying next to one another, which have a profile width Br, a distance from profile bar 4 to profile bar 4 of P1, a profile bar head width b1 and a profile depth t1, with 4 screening slots or screening gaps being formed between adjacent profiled screen bars 4, which have a slot width w.
Date Recue/Date Received 2020-10-06 The screen bars 4' in the treatment zone B have a profile head width Br, a distance from profile bar 4' to profile bar 4' of P2, a profile bar head width b2, with the profile depth being indicated with t2.
As can be seen from this illustration, the screen bars 4 are arranged in the preferred example in the treatment zone A with a profile depth t1, and the profile bars 4' are arranged in the treatment zone B with a profile depth t2. The slot width w is constant in each of both treatment zones A, B. The profile depth t1 in the treatment zone A is smaller than the profile depth t2 in the treatment zone B, or, in other words, the profile depth t, designated there with t1, increases from the treatment zone A
to the treatment zone B to t2. Furthermore, the diameter of the screening device 1 on the stock inlet side (inflow) 2 is greater than on the reject outlet side 3 (reject).
Fig. 2 schematically illustrates a screening device 1 according to Fig. 1 in conjunction with an internally running rotor 6 which is equipped with a blade 7. Since the screening device 1 according to the invention is of conical configuration, the gap between the blades 7 and the inner wall of the screening device 1 is smaller in Fig. 2, starting from the stock inlet side 2 in the direction of the reject outlet side 3. As a consequence, the sorting efficiency can be significantly increased.
Fig. 3 shows an alternative embodiment in which the screening device 1 interacts with an internally running rotor 6', which is also equipped with blades 7'.
Though the design is realized here such as to configure the rotor 6' also conical as is the screening device 1, but the diameter of the rotor 6' becomes smaller starting from the stock inlet side 2 in the direction of the reject outlet side 3. As a result, the blades 7' also follow the conical configuration of the screening device 1. The gap between the blades 7 of the rotor 6' and the inner wall of the conically configured screening device 1 therefore remains approximately constant, starting from the stock inlet side 2 to the reject outlet side 3.
Date Recue/Date Received 2020-10-06 According to Fig. 4, the profile bars 4, 4' are aligned axially to the screen basket axis 4 as preferred embodiment of the screening device 1.
In Fig. 5, the profile bars 4, 4', serving as screen bars, are aligned linearly inclined at an angle a in relation to the screen basket axis as preferred embodiment of the screening device 1.
Finally, as is apparent from Fig. 6, the profile bars 4, 4' are discontinuously curved and aligned in relation to the screen basket axis as preferred embodiment of the screening device 1.
Of course, the invention is not limited to the details described above, but numerous changes and modifications are possible, which the person skilled in the art will make if necessary, without departing from the spirit of the invention. In particular, it is essential in the invention that the profile bars 4, 4' are arranged such as to be assigned to the corresponding treatment zone, so that the profile depth t1, t2 starting from the stock inlet side 2 to the reject outlet side 3 increases while the slot widths w between adjacent profile rods 4, 4' in the screen basket axis direction is constant, and the diameter of the screening device 1 on the stock inlet side 2 is greater than on the reject outlet side 7, so as to establish a conical configuration of the screening device 1 in accordance with the invention is obtained. In this way, the screening device 1 can be suited in the through flow direction to the respective requirements, circumstances and treatment conditions and can be tailored accordingly in a targeted manner.
Date Recue/Date Received 2020-10-06 6. Screening device according to one of claims 1 to 3, characterized in that the screen bars (4, 4') are aligned discontinuously curved in relation to the screen basket axis.
7. Screening device according to one of the preceding claims, characterized in that the profile bars (4, 4 ') have an essentially triangular, common profile.
8. Screening device according to one of the preceding claims, characterized in that the slot width (w) is in a range from 0.05 mm to 0.8 mm, preferably 0.1 to 0.4 mm.
9. Screening device according to one of the preceding claims, characterized in that the profile bar width (b1, b2) is in a range from 2.0 mm to 8 mm, preferably 2.0 mm to 4.0 mm.
Date Recue/Date Received 2020-10-06
In the figures of the drawing, same or similar parts are provided with the same reference signs.
Fig. 1 shows an exemplary embodiment of a screening device, generally designated with 1 and subdivided into at least two different treatment zones A, B in through flow direction from the stock inlet side (inflow) to the reject outlet side (reject). The inflow on the stock inlet side 2 and the reject on the reject outlet side 3 are indicated by arrows. The flow direction of the accepted stock is also indicated by arrows in conjunction with the designation "Accept".
On the right-hand side of Fig. 1, the corresponding arrangement of profile bars 4 is illustrated by way of an enlarged detail illustration next to the treatment zones A, B.
As can be seen overall from Fig. 1, the profile bars 4 are arranged in such a way that with a constant slot width w between adjacent profile bars 4 in axial direction of the screen basket, the profile depth t increases from the stock inlet side to the reject outlet side, and the diameter of the screening device 1 on the stock inlet side 2 is greater than on the reject outlet side 3. The screening device 1 according to the invention is thus configured conically in a predetermined manner and in such a way that the diameter of the stock inlet side 2 is greater than on the reject outlet side 3.
Illustrated in treatment zone A are three screen bars 4 lying next to one another, which have a profile width Br, a distance from profile bar 4 to profile bar 4 of P1, a profile bar head width b1 and a profile depth t1, with 4 screening slots or screening gaps being formed between adjacent profiled screen bars 4, which have a slot width w.
Date Recue/Date Received 2020-10-06 The screen bars 4' in the treatment zone B have a profile head width Br, a distance from profile bar 4' to profile bar 4' of P2, a profile bar head width b2, with the profile depth being indicated with t2.
As can be seen from this illustration, the screen bars 4 are arranged in the preferred example in the treatment zone A with a profile depth t1, and the profile bars 4' are arranged in the treatment zone B with a profile depth t2. The slot width w is constant in each of both treatment zones A, B. The profile depth t1 in the treatment zone A is smaller than the profile depth t2 in the treatment zone B, or, in other words, the profile depth t, designated there with t1, increases from the treatment zone A
to the treatment zone B to t2. Furthermore, the diameter of the screening device 1 on the stock inlet side (inflow) 2 is greater than on the reject outlet side 3 (reject).
Fig. 2 schematically illustrates a screening device 1 according to Fig. 1 in conjunction with an internally running rotor 6 which is equipped with a blade 7. Since the screening device 1 according to the invention is of conical configuration, the gap between the blades 7 and the inner wall of the screening device 1 is smaller in Fig. 2, starting from the stock inlet side 2 in the direction of the reject outlet side 3. As a consequence, the sorting efficiency can be significantly increased.
Fig. 3 shows an alternative embodiment in which the screening device 1 interacts with an internally running rotor 6', which is also equipped with blades 7'.
Though the design is realized here such as to configure the rotor 6' also conical as is the screening device 1, but the diameter of the rotor 6' becomes smaller starting from the stock inlet side 2 in the direction of the reject outlet side 3. As a result, the blades 7' also follow the conical configuration of the screening device 1. The gap between the blades 7 of the rotor 6' and the inner wall of the conically configured screening device 1 therefore remains approximately constant, starting from the stock inlet side 2 to the reject outlet side 3.
Date Recue/Date Received 2020-10-06 According to Fig. 4, the profile bars 4, 4' are aligned axially to the screen basket axis 4 as preferred embodiment of the screening device 1.
In Fig. 5, the profile bars 4, 4', serving as screen bars, are aligned linearly inclined at an angle a in relation to the screen basket axis as preferred embodiment of the screening device 1.
Finally, as is apparent from Fig. 6, the profile bars 4, 4' are discontinuously curved and aligned in relation to the screen basket axis as preferred embodiment of the screening device 1.
Of course, the invention is not limited to the details described above, but numerous changes and modifications are possible, which the person skilled in the art will make if necessary, without departing from the spirit of the invention. In particular, it is essential in the invention that the profile bars 4, 4' are arranged such as to be assigned to the corresponding treatment zone, so that the profile depth t1, t2 starting from the stock inlet side 2 to the reject outlet side 3 increases while the slot widths w between adjacent profile rods 4, 4' in the screen basket axis direction is constant, and the diameter of the screening device 1 on the stock inlet side 2 is greater than on the reject outlet side 7, so as to establish a conical configuration of the screening device 1 in accordance with the invention is obtained. In this way, the screening device 1 can be suited in the through flow direction to the respective requirements, circumstances and treatment conditions and can be tailored accordingly in a targeted manner.
Date Recue/Date Received 2020-10-06 6. Screening device according to one of claims 1 to 3, characterized in that the screen bars (4, 4') are aligned discontinuously curved in relation to the screen basket axis.
7. Screening device according to one of the preceding claims, characterized in that the profile bars (4, 4 ') have an essentially triangular, common profile.
8. Screening device according to one of the preceding claims, characterized in that the slot width (w) is in a range from 0.05 mm to 0.8 mm, preferably 0.1 to 0.4 mm.
9. Screening device according to one of the preceding claims, characterized in that the profile bar width (b1, b2) is in a range from 2.0 mm to 8 mm, preferably 2.0 mm to 4.0 mm.
Date Recue/Date Received 2020-10-06
Claims (9)
1. Screening device, preferably in the form of a screen basket, having screening slots or screening gaps formed between profiled screen bars (4, 4'), with the screen bars (4, 4') being received at their foot area in receiving recesses of support elements, which receiving recesses are suited to the foot area geometry, and being permanently attached to the support elements, characterized in that the profile bars (4, 4') are arranged in such a way that the profile depth (tl, t2) starting from the stock inlet side (2) to the reject outlet side (3) increases, when a slot width (w) between adjacent profile bars (4, 4') is constant in axial direction of the screen basket, and the diameter of the screening device (1) on the stock inlet side (2) is greater than on the reject outlet side (3).
2. Screening device according to claim 1, characterized in that the profile depth (t1, t2) increases continuously starting from the stock inlet side (2) to the reject outlet side (3).
3. Screening device according to claim 1, characterized in that the profile depth (tl , t2) increases incrementally from the stock inlet side (2) to the reject outlet side (3).
4. Screening device according to one of the preceding claims, characterized in that the screen bars (4, 4') are aligned axially in relation to the screen basket axis.
5. Screening device according to one of the preceding claims 1 to 3, characterized in that the screen bars (4, 4') are configured linearly inclined in relation to the screen basket axis.
Date Recue/Date Received 2020-10-06
Date Recue/Date Received 2020-10-06
6. Screening device according to one of claims 1 to 3, characterized in that the screen bars (4, 4') are aligned discontinuously curved in relation to the screen basket axis.
7. Screening device according to one of the preceding claims, characterized in that the profile bars (4, 4 ') have an essentially triangular, common profile.
8. Screening device according to one of the preceding claims, characterized in that the slot width (w) is in a range from 0.05 mm to 0.8 mm, preferably 0.1 to 0.4 mm.
9. Screening device according to one of the preceding claims, characterized in that the profile bar width (bl , b2) is in a range from 2.0 mm to 8 mm, preferably 2.0 mm to 4.0 mm.
Date Recue/Date Received 2020-10-06
Date Recue/Date Received 2020-10-06
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018005307.6 | 2018-07-04 | ||
| DE102018005307.6A DE102018005307B3 (en) | 2018-07-04 | 2018-07-04 | screening device |
| PCT/EP2019/000199 WO2020007499A1 (en) | 2018-07-04 | 2019-07-01 | Screening device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3096277A1 true CA3096277A1 (en) | 2020-01-09 |
Family
ID=66547966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3096277A Pending CA3096277A1 (en) | 2018-07-04 | 2019-07-01 | Screening device |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP3790669A1 (en) |
| KR (1) | KR102479630B1 (en) |
| CN (1) | CN112703064A (en) |
| CA (1) | CA3096277A1 (en) |
| DE (1) | DE102018005307B3 (en) |
| WO (1) | WO2020007499A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3491888A (en) * | 1968-12-27 | 1970-01-27 | Universal Oil Prod Co | Self-cleaning screen baskets |
| DE4104615A1 (en) * | 1991-02-15 | 1992-08-20 | Voith Gmbh J M | SIEVE BASKET |
| DE4121897A1 (en) * | 1991-07-02 | 1993-01-07 | Fiedler Heinrich Gmbh | SCREEN ELEMENT |
| DE4432842C2 (en) | 1994-09-15 | 1996-09-26 | Voith Sulzer Stoffaufbereitung | Process for discharging unwanted solid particles from an aqueous fiber suspension and device for carrying it out |
| DE19609316C2 (en) | 1996-03-09 | 2002-04-18 | Voith Sulzer Stoffaufbereitung | Process for producing a screening device with controlled uneven sorting slots and screening device and their use |
| DE102007015901B4 (en) * | 2007-04-02 | 2023-07-20 | Andritz Fiedler Gmbh | screening device |
| DE102014011679A1 (en) | 2013-08-20 | 2015-02-26 | Andritz Fiedler Gmbh | Profiled sieve and sieve device made of profiled sieve bars |
| WO2018039719A1 (en) * | 2016-08-30 | 2018-03-08 | Schmacker Investments Pty Ltd | Wire member and method of making wire member |
-
2018
- 2018-07-04 DE DE102018005307.6A patent/DE102018005307B3/en active Active
-
2019
- 2019-07-01 CN CN201980044928.0A patent/CN112703064A/en active Pending
- 2019-07-01 KR KR1020207031168A patent/KR102479630B1/en active IP Right Grant
- 2019-07-01 EP EP19737660.1A patent/EP3790669A1/en active Pending
- 2019-07-01 WO PCT/EP2019/000199 patent/WO2020007499A1/en unknown
- 2019-07-01 CA CA3096277A patent/CA3096277A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN112703064A (en) | 2021-04-23 |
| KR20200136989A (en) | 2020-12-08 |
| DE102018005307B3 (en) | 2019-06-06 |
| EP3790669A1 (en) | 2021-03-17 |
| WO2020007499A1 (en) | 2020-01-09 |
| KR102479630B1 (en) | 2022-12-21 |
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