EP4121281A1 - Method for producing a screen body, and screen - Google Patents
Method for producing a screen body, and screenInfo
- Publication number
- EP4121281A1 EP4121281A1 EP20829307.6A EP20829307A EP4121281A1 EP 4121281 A1 EP4121281 A1 EP 4121281A1 EP 20829307 A EP20829307 A EP 20829307A EP 4121281 A1 EP4121281 A1 EP 4121281A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sieve
- screen
- screen body
- screw press
- screw
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 41
- 239000000654 additive Substances 0.000 claims abstract description 13
- 230000000996 additive effect Effects 0.000 claims abstract description 13
- 238000010146 3D printing Methods 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 45
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 10
- 239000004033 plastic Substances 0.000 claims description 10
- 229920003023 plastic Polymers 0.000 claims description 10
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 5
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000009760 functional impairment Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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
- B30B9/26—Permeable casings or strainers
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/111—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
-
- 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
- B30B9/121—Screw constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
Definitions
- the invention relates to a method for producing a screen body which has one or more openings on a screen surface, in particular a screen body for a screen used in a screw press.
- the invention further relates to a sieve with a sieve body which has one or more openings on a sieve surface, in particular a sieve for a screw press.
- Screw presses are well known from the prior art. Such screw presses are used, for example, to separate a liquid from a transported material and have a spiral conveyor arranged on a driven screw shaft and a housing jacket surrounding it, with a transport passage for the transported material to be conveyed being formed between the screw shaft and the housing jacket and partially limited by the conveyor screw is to convey transported goods through the transport aisle along a longitudinal axis of the screw press by means of the conveyor helix when the screw shaft rotates.
- the housing shell usually has openings so that liquid is separated from the transported goods via a pressure exerted on the transported goods during transport and conveyed out of the transport passage through the openings in order to feed the transported goods along a longitudinal axis during movement through the screw press dry.
- the openings are usually made in a sheet that acts as a sieve and is part of the housing jacket. According to the prior art, this sieve is formed by drilling holes in the sheet metal. Since the sheet metal has a cylindrical contour, this is associated with a great deal of effort.
- a function of the screw press is dependent on a friction between the transported goods and the screw shaft or the conveyor helix arranged on the screw shaft on the one hand and between the transported goods and an inner surface of the housing jacket, usually the sieve designed as a sheet metal, relative to which the screw shaft in a Operation is driven in rotation, on the other hand. If the friction between the goods to be transported and the inside of the housing jacket falls below a defined threshold, the goods to be transported become the The worm shaft is not conveyed along a longitudinal direction of the worm shaft, but merely moved together with the worm shaft and the conveying helix in rotation around the longitudinal axis and relative to the housing shell, so that the transported goods are not dried and a corresponding process comes to a standstill.
- the housing jacket generally has a metal screen which, when installed when new, has a defined minimum roughness in order to ensure appropriate friction between the transported goods and the housing jacket.
- a metal screen which, when installed when new, has a defined minimum roughness in order to ensure appropriate friction between the transported goods and the housing jacket.
- the object of the invention is to provide a method for producing a screen body of the type mentioned at the outset which, when used in a housing jacket of a screw press, allows the screw press to function for a particularly long period of time and at the same time is easy to produce.
- a sieve of the type mentioned at the outset is to be specified which, when used in a housing jacket of a screw press, enables the screw press to be operated over a particularly long period of time.
- the first object is achieved according to the invention by a method of the type mentioned at the outset, the screen body being formed by a sintering method and / or an additive manufacturing method, in particular a 3D printing method.
- a material formed by a sintering process and / or an additive manufacturing process such as, in particular, a 3D printing process has a constant surface roughness, even if part of the surface is removed, for example due to abrasive wear.
- a corresponding production method is advantageous, especially since a wide variety of geometries can be produced in a simple manner, while a geometry of screens of the prior art is often predefined by a tool with which these screens are produced and cannot be easily changed.
- specially adapted sieves can be formed in a simple manner for different operating conditions of a screw press such as, for example, a different composition of a transported goods to be dried, whereby such a drying process can be implemented particularly efficiently.
- sieves with different hole geometries for different positions on a screw press can be produced in a simple manner, for example in order to adapt an open area of the sieves to a dry content of the transported goods to be dried that varies over a length of the screw press.
- a corresponding material usually has a predefined porosity, so that removal of the material on a surface also leads to a roughness of a new surface.
- a material can easily be formed which contains harder and softer particles, which in turn can be used to achieve a defined roughness even in the event of abrasion. This can be achieved, for example, via different boundary conditions during a 3D printing process, in particular different temperatures, and / or different starting materials used during production.
- the screen body is formed by a plastic, a metal or a ceramic material.
- Such materials have proven to be particularly favorable to be used in a sintering process or an additive manufacturing process Formation of an appropriate body to be used.
- a defined porosity of the material or a roughness, which is also achieved when a surface is ablated, can then optionally be ensured in a simple manner via a material composition and parameters of the manufacturing process.
- a light material such as a plastic also has the particular advantage that it is much easier to replace the corresponding screens in a screw press than with heavy metal parts.
- plastics usually have a lower coefficient of thermal expansion than metals, so that thermal expansions or thermal stresses are also reduced, which arise between standstill and operation due to the usually high operating temperature of screw presses of, for example, 90 ° C.
- a plastic with a Shore hardness of more than 50, in particular about 75, measured according to Shore-D is used in order to achieve a particularly long service life when used in a screw press.
- fibers are incorporated into the screen body and / or formed in the screen body when the screen body is formed.
- glass fibers or carbon fibers can thus be incorporated into the screen body.
- the screen body is formed from different materials over a thickness. Different material properties can thus be achieved in a simple manner over a thickness, that is to say along a direction normal to the screen surface.
- a material with higher strength and / or greater rigidity than on the screen surface can thus be used in an area spaced apart from the screen surface in order to, for example, even at the pressures of, for example, 1 bar to 10 bar and temperatures of for example 90 ° C to obtain only slight deformations and at the same time to ensure the desired roughness on the screen surface.
- the screen body is formed from a first material, which forms the screen surface, and a second material, which forms a region of the screen body spaced from the screen surface, the second material being more rigid than the first Having material.
- the screen body is at least partially formed from a material which is dimensionally stable at a temperature of at least 45 ° C., in particular at a temperature of at least 90 ° C., and a pressure load of 1.5 N / mm 2.
- a material with a tensile modulus of at least 800 N / mm 2 and / or a tensile strength of at least 20 N / mm 2 is preferably used.
- the screen body is usually formed from a material which is suitable for use in a wet environment with a pH value of 6 to 9 in order to achieve a particularly long service life when used in a screw press.
- the screen body in which cellulose, food and / or sludge is dried, if the screen body is formed from a material which is suitable for a dry content of the material conveyed in the screw press of 3%. up to 40% is suitable.
- the material aseTK49 is particularly suitable for a corresponding screen body, especially since this material has a tensile modulus of about 1650 N / mm 2 , an elongation at break of about 15%, a dimensional stability of 1.5 N / mm 2 and 90 ° C as well as at 0.4 N / mm 2 and 150 ° C and a tensile strength of about 40 N / mm 2 and a compressive strength of about 65 N / mm 2 and at the same time forms a structure which is essentially constant even in the event of abrasion Roughness guaranteed. Furthermore, this material is suitable for use in a screw press under correspondingly wet conditions at the pH values that prevail.
- the one or more openings are formed during the sintering process and / or the additive manufacturing process.
- a screen which can be used in a screw press, for example, is formed according to the invention using a screen body designed according to the invention.
- the sieve usually has fastening devices with which the sieve can be connected, for example, to a frame, a sieve basket or the like, in order, for example, to releasably arrange the sieve in a housing jacket of a screw press.
- the sieve can be formed exclusively by the sieve body or it can also contain the sieve body as a separate body in addition to further components which are used, for example, to fasten the sieve body in the screw press.
- the sieve body consists of a material which is formed in a sintering process and / or an additive manufacturing process, in particular a 3D printing process, the sieve in particular in an inventive Process is established.
- a particularly long-lasting operation of a screw press or another device in which a constant coefficient of friction of a surface of the sieve or a constant roughness of a surface of the sieve is advantageous, can be ensured in a simple manner, especially even with abrasion of Parts of the surface continue to have a corresponding roughness.
- at least the screen body of the screen that is to say that part of the screen which has the screen surface with the openings, is designed accordingly.
- the screen is formed entirely by a corresponding method and is made in one piece with the screen body.
- the screen body has an essentially constant, defined porosity up to a defined depth, in particular up to a depth of at least 1 mm. This ensures that the desired roughness is always present on the surface even with corresponding wear. Above a defined depth, i.e. over a defined distance from the screen surface, the screen or the screen body must often be changed anyway, since otherwise the distance between the conveying helix and the housing jacket will be too large.
- the screen is designed as part of an essentially rotationally symmetrical body, in particular as part of a cylinder jacket or a conical jacket, so that several identical screens can be combined to form an essentially rotationally symmetrical body.
- a sieve can be designed, for example, as a tile of an inner surface of a cylindrical housing jacket, so that a housing jacket of a very large screw press with appropriately manufactured sieves can also be formed.
- a Replacing a defective screen is very easy. As a rule, the sieve is thin-walled.
- the screen In addition to the screen body, the screen usually also has devices for being connected, preferably detachably, to a frame or the like.
- the devices can be designed, for example, as openings through which the screen can be connected to the frame by means of screws.
- a recess in particular a fold or a chamfer, is provided on at least one side edge in order to enable the screen to be fixed in a form-fitting manner, in particular in a direction normal to the screen surface.
- a recess in particular a fold or a chamfer
- T-shaped connecting strips can be provided which correspond to folds arranged on the edges of the sieves in order to connect the sieves to a frame or a support basket in a form-fitting manner by screwing the T-shaped fastening means.
- a groove is provided on a first side surface, which is preferably arranged approximately normal to the screen surface.
- the sieve can then easily be coupled to another sieve or a frame via the side surface.
- a projection is arranged on a second side surface, which is preferably approximately parallel to the first side surface, which corresponds to the groove, so that two appropriately designed screens are placed over the first side surface and the second side surface by means of the projection and the groove can be connected positively and / or non-positively, in particular by means of a click connection.
- the projection is formed with an undercut so that the projection can snap into the correspondingly formed groove.
- a corresponding screen for use in a screw press is flat, preferably as part of a cylinder jacket surface or a cone jacket surface, so that a corresponding housing jacket of the screw press acting as a screen can be formed by several interconnected screens.
- An installation and removal of the corresponding sieves is particularly easy if these can be connected to one another in a form-fitting or force-fitting manner, in particular by means of a click connection.
- a screw press for separating liquid from a transport material with a screw shaft including a spiral conveyor arranged on the screw shaft and a housing jacket surrounding it, with a transport passage for the transport material to be conveyed being formed between the screw shaft and the housing jacket, with the Housing jacket has at least one sieve, so that the liquid separated from the transported goods can be conveyed through the housing jacket if the sieve is designed according to the invention.
- the sieve extends only over part of a circumference of the housing jacket, which is essentially rotationally symmetrical, in particular cylindrical or frustoconical. On the one hand, this simplifies the production of the screen. On the other hand, a defective screen can then also be exchanged in a simple manner without exchanging the entire housing jacket.
- the housing jacket is thus essentially formed by a large number of individual screens, which are approximately tile-shaped and are therefore easy to replace.
- a housing jacket of a very large screw press can also be formed, for example, with sieve bodies or sieves formed in a 3D printing process.
- sieves designed according to the invention can easily be designed with a wide variety of geometries, it can also be provided that sieves with different hole geometries and / or different open surfaces are used over a length of the screw press.
- a geometry of the screen can, for example, at the respective position in the Screw press prevailing operating conditions, in particular to a dry content of the transported goods to be dried at the respective position, so that a more efficient process can be achieved.
- the sieve can in principle be arranged in the housing jacket in a wide variety of ways. It is favorable if the sieve is fixed in the housing jacket by means of a fastening means, preferably by means of a screw connection.
- the fastening means can for example be designed as a fastening strip.
- the housing jacket has a support frame, in particular a support cage, to which the screen is connected in a form-fitting and / or force-fitting manner, in particular by means of a screw connection.
- the sieve or the several sieves, through which a sieving effect of the housing jacket is achieved, can then be exchanged in a simple manner.
- the support frame is designed as a support cage.
- the support cage is made of metal.
- Such a support basket can then accommodate both conventionally manufactured sieve plates and sieves designed according to the invention, so that existing screw presses can easily be equipped with sieves designed according to the invention.
- the screen is positively connected to the support structure by means of a fastening means.
- the fastening means can be designed, for example, as a fastening strip with a T-shaped cross section and positioned between two sieves, so that in each case one sieve is connected to the support frame by two fastening strips arranged on its side edges.
- the fastening means consists of the same material as the strainer body. It is then ensured that the fastening means is affected by abrasive wear in the same way as the screen body itself, so that a uniform surface removal takes place, whereby an essentially smooth surface is maintained even in the event of wear.
- the screen usually consists of a single component which is formed by a body formed in a sintering process and / or additive manufacturing process, in particular a 3D printing process.
- Features of the screen which are used for fastening such as a fold, a groove, a projection and the like can thus also be formed in a simple manner in the course of additive manufacturing.
- Figures 3 and 4 show a sieve; 5 shows a sieve together with a support basket and a fastening means;
- Fig. 6 is a sectional view of a screen
- FIGS. 7 to 9 details of FIG. 6.
- the screw press 10 is designed for separating liquid from a transport material, in particular made of cellulose, and has a screw shaft 11 that is rotatably arranged in a stationary housing jacket 13 by means of a drive about a longitudinal axis 15, a conveyor helix 12 being arranged on the screw shaft 11 so that between the worm shaft 11, the housing jacket 13 and the conveyor helix 12, a transport passage for the goods to be conveyed is formed.
- the worm shaft 11 rotates about the longitudinal axis 15, the goods to be transported are thus also conveyed along the longitudinal axis 15 in the transport aisle, pressure being exerted on the goods to be transported in order to separate out liquid located in the goods.
- the separated liquid is discharged through the housing jacket 13 from an interior of the screw press 10, the housing jacket 13 acting as a sieve.
- the housing jacket 13 of the screw press 10 is formed by jacket elements 16 which are essentially semi-cylindrical on the inside formed, one of which is shown in FIG.
- the casing elements 16 have sieves 1 fastened to a support basket 14 made of metal, with openings 18 (not shown in FIG. 2) in order to separate solids from the liquid when the screw press 10 is in operation.
- the individual screens 1 are designed as tiles, that is to say as parts of a cylinder jacket surface, and are supported radially outward on the support cage 14.
- the housing jacket 13 can be subjected to an internal pressure of, for example, 1 bar to 10 bar when the screw press 10 is in operation, without this leading to significant deformations of the sieves 1.
- the tile-shaped screens 1 are positively connected to the support cage 14 via fastening means designed as fastening strips 19, which are T-shaped in cross section and are connected to the support cage 14 via screw connections.
- a function of the screw press 10 depends essentially on the fact that a defined friction is ensured between the transported goods and the sieve surface 5, since if the friction falls below a defined minimum, the transported goods are not conveyed along the longitudinal axis 15, but rotate with the screw shaft 11 around the axis of rotation.
- the screen body that is to say that part of the screen 1 which has the screen surface 5 with the openings 18, is formed by a sintering process and / or an additive manufacturing process, so that even when part of a surface or the screen surface 5 is removed, for example due to abrasive wear, when the transported goods slide over the sieve surface 5, a sieve surface 5 with a predefined minimum roughness still results and it is therefore not possible to achieve a completely smooth surface of the sieve body with which a function would no longer be guaranteed.
- the sieve 1 is formed entirely by the sieve body, although an embodiment is of course also conceivable in which the sieve body formed by a corresponding method is, for example, detachably arranged in a frame of a sieve 1 formed from several components, which frame also consists of another Material than the strainer body could exist.
- the fastening means designed here as fastening strips 19 with a T-shaped cross-section, are formed from a material corresponding to the screen body and can also be produced in a 3D printing process, so that abrasion of the fastening strips 19 corresponds to abrasion of the screen body and also in the event of wear or tear. after prolonged operation of the screw press 10, an essentially cylindrical and smooth surface of the housing jacket 13 is ensured on the inside.
- FIGS. 3 to 9 show a corresponding sieve 1 in detail, FIG. 3 showing an isometric view of the sieve 1, FIG. 4 a plan view of the sieve 1, FIG. 5 a side view of the sieve 1 shown in FIGS. 3 and 4 including of a part of a support cage 14 and a fastening strip 19 and FIG. 6 shows a section along the line VI-VI in FIG.
- FIG. 7 shows the detail VII from FIG. 6,
- FIG. 8 shows the detail VIII from FIG. 6 and
- FIG. 9 shows the detail IX from FIG. 6.
- the sieve 1 is designed essentially in the shape of a cylinder jacket, with a plurality of openings 18 being provided on an inside sieve surface 5 of the sieve 1, which openings extend through the sieve 1 in the radial direction.
- a cross section of the openings 18 increases from an interior to an exterior or with an increasing distance from the screen surface 5. This prevents the openings 18 from clogging in a simple manner and at the same time ensures that only solids with a diameter 17 smaller than the minimum diameter 17 of the openings 18 are carried from the interior, which in the illustrated embodiment can be 1.5 mm, for example .
- the openings 18 can also, as can be seen in particular in FIG. 7, be designed with an opening angle ⁇ which can be, for example, 10 ° to 30 °.
- a projection 9 corresponding to the groove 8 is provided.
- the first side surface 6 and the second side surface 7 as well as the groove 8 and the projection 9 run in the circumferential direction in the sieve 1 shown in the exemplary embodiment.
- the projection 9 is shown in detail in FIG. 8.
- the projection 9 has an undercut 2, so that it is possible for the projection 9 to snap into the groove 8 shown in detail in FIG. 9.
- a click mechanism for simply connecting several screens 1 along the longitudinal axis 15 is achieved in a simple manner.
- the screens 1 can be fastened in the support cage 14, as shown in FIG. 2, by means of two fastening strips 19 arranged along the screen 1.
- a fold 3 is formed on each side edge of the sieve body, which in the installed state run approximately parallel to the longitudinal axis 15, which corresponds to a cross section of the fastening strip 19, so that when the fastening strip 19 is arranged between two sieves 1, as shown in FIG. 5 a substantially cylindrical inside of the housing jacket 13 results.
- the support basket 14 arranged behind the sieve 1 in the screw press 10 and a fastening strip 19 are also shown schematically.
- the fastening strip 19, which is designed here with an approximately T-shaped cross section, is connected to the support basket 14 by means of a screw 4 in order to fix the screen 1 to the support basket 14 in a form-fitting manner.
- bores could also be provided in the sieve 1 in order to screw the sieve 1 directly to the support basket 14.
- the screen body and the screen 1 are formed in one piece from a plastic in a 3D printing process, the openings 18 also being formed during the 3D printing process.
- a material is achieved which has a constant roughness even when the screen surface 5 is abraded, so that the function of the screw press 10 is guaranteed even when the screen body is worn.
- different materials can also be used in order, for example, to achieve greater rigidity and lower porosity as the distance from the sieve surface 5 increases, so that a high level of rigidity is achieved despite favorable tribological properties.
- fibers can also be used in the sieve 1 can be incorporated or formed in the sieve body in order to achieve favorable mechanical properties.
- screens 1 with a wide variety of geometries can be formed in a simple manner in order, for example, for different operating conditions, which can arise, for example, both depending on a transport item to be dried and depending on a position on a screw press, different screens 1 with different hole geometries and / or to be able to provide different open areas. Corresponding drying processes can thereby be carried out particularly efficiently.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combined Means For Separation Of Solids (AREA)
- Filtering Materials (AREA)
- Screw Conveyors (AREA)
- Filtration Of Liquid (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Powder Metallurgy (AREA)
- Manufacturing Of Printed Wiring (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA50221/2020A AT523264B1 (en) | 2020-03-16 | 2020-03-16 | Process for the production of a sieve body and sieve |
PCT/AT2020/060484 WO2021184051A1 (en) | 2020-03-16 | 2020-12-22 | Method for producing a screen body, and screen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4121281A1 true EP4121281A1 (en) | 2023-01-25 |
Family
ID=74045361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20829307.6A Pending EP4121281A1 (en) | 2020-03-16 | 2020-12-22 | Method for producing a screen body, and screen |
Country Status (9)
Country | Link |
---|---|
US (1) | US20230081259A1 (en) |
EP (1) | EP4121281A1 (en) |
JP (1) | JP2023518628A (en) |
CN (1) | CN115279579A (en) |
AT (1) | AT523264B1 (en) |
AU (1) | AU2020436451A1 (en) |
CA (1) | CA3161190A1 (en) |
CL (1) | CL2022002162A1 (en) |
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CN109821310B (en) * | 2019-03-04 | 2023-08-08 | 正泰电气股份有限公司 | Self-cleaning ventilation filter device on complete switch equipment in preassembled transformer substation and complete switch equipment of preassembled transformer substation |
CN114522461B (en) * | 2022-02-08 | 2023-09-29 | 濮阳市中原锐实达石油设备有限公司 | Screen sealing device of vibrating screen |
CN114272656A (en) * | 2022-03-07 | 2022-04-05 | 河南省中健医疗器械有限公司 | Pesticide residue detection pretreatment device |
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-
2020
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- 2020-12-22 WO PCT/AT2020/060484 patent/WO2021184051A1/en active Application Filing
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- 2020-12-22 US US17/802,257 patent/US20230081259A1/en active Pending
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- 2020-12-22 AU AU2020436451A patent/AU2020436451A1/en active Pending
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JP2023518628A (en) | 2023-05-08 |
CN115279579A (en) | 2022-11-01 |
US20230081259A1 (en) | 2023-03-16 |
CA3161190A1 (en) | 2021-09-23 |
WO2021184051A1 (en) | 2021-09-23 |
AU2020436451A1 (en) | 2022-06-09 |
AT523264B1 (en) | 2021-07-15 |
CL2022002162A1 (en) | 2023-03-10 |
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