EP4176981A1 - Magnetic screen bottom attachment system with automatic positioning - Google Patents

Abstract

The invention relates to a fastening system for fastening replaceable screen cloth segments (30, 33) to a screening machine with at least one screen holder (40) receiving one or more screen cloth segments (30, 33), one or more magnets being directly or indirectly attached to the screen holder (40). (12, 22), the magnets (12, 22) interacting with at least one vibration-proof ferromagnetic coupling element (32) arranged in or on each screen mat segment (30, 33) and thereby creating a magnetic connection between the magnets (12, 22) and the screen mat segment (30, 33) and the screen mat segment (30, 33) is magnetically coupled to the portafilter (40), the portafilter (40) itself and/or at least one adapter (10) attached to the portafilter (40), 20) has at least one guide element (11, 21) along which the screen cloth segment (30, 33) slides during assembly and is guided into its final assembly position on the screen carrier (40).

Description

The invention relates to a fastening system for fastening replaceable screen mesh segments to a screening machine with at least one screen carrier receiving one or more screen mesh segments, with one or more magnets being arranged directly or indirectly on the screen carrier, the magnets being arranged in a vibration-proof manner with at least one in or on each screen mesh segment ferromagnetic coupling element and thereby produce a magnetic connection between the magnets and the screen cloth segment and the screen cloth segment is magnetically coupled to the screen carrier.

Such a magnetic fastening systems for fastening replaceable screen lining segments to a screening machine is from EP 3 406 357 A1 known.

In order to ensure vibration-proof magnetic attachment of screen lining segments to a screening machine, the magnets must generate a sufficiently high holding force and accordingly have a considerable magnetic field strength.

A disadvantage of the known magnetic fastening systems is that after the screen lining segments have been placed and the magnetic connection has been made, alignment and displacement of the screen lining segments is only possible with a great deal of force since the magnetic holding forces have to be overcome. The assembly of screen lining segments is therefore very complex.

The object of the invention is to overcome these disadvantages and to specify a magnetic screen cloth fastening system which allows simple assembly and alignment of screen cloth segments on a screening machine.

According to the invention, this object is achieved by a fastening system according to claim 1 . Advantageous developments of the invention are specified in the dependent claims.

Particularly advantageous in the fastening system for fastening replaceable screen mesh segments to a screening machine with at least one screen carrier receiving one or more screen mesh segments, with one or more magnets being arranged directly or indirectly on the screen carrier, the magnets being arranged in a vibration-proof manner with at least one in or on each screen mesh segment ferromagnetic coupling element and thereby produce a magnetic connection between the magnets and the screen mat segment and the screen mat segment is magnetically coupled to the portafilter, it is that the portafilter itself and/or at least one adapter attached to the portafilter has at least one guide element on which the Screen lining segment slides along during assembly and is guided into its final assembly position on the portafilter.

With the concept of the final assembly position, the correct position of the screen lining segment on the screen carrier of the screening machine is referred to, ie that there is no further alignment or in this final assembly position Relocation of the screen lining segment requires more. The screening machine can be of oscillating or static screen design.

According to the invention, at least one guide element is thus arranged, with the screen mat segment to be assembled sliding along this guide element during assembly at the moment it is placed on the screen carrier of the screening machine and being automatically forced into its final assembly position. The magnetic force has a supporting effect and automatically pulls the screen mat segment during assembly along the guide element into the final assembly position on the vibration-excitable screen carrier of the screening machine.

The guide element forms a positioning aid when placing the screen mat segment and allows it to automatically slide along the guide element into its end position.

In particular, several screen lining segments can form a screen floor or a screen drum. In this case, the portafilter and/or the adapter(s) has/have at least one guide element for each individual screen surface segment.

At least one adapter is preferably attached to the portafilter, with the adapter having at least one magnet. Such an adapter can in particular be designed in the form of an elongate adapter strip. Such an adapter strip runs along an edge of the screen mat segment to be assembled. For the purposes of the invention, the terms adapter and adapter strip are used synonymously. Such an adapter strip can be attached in particular by means of one or more pins driven in from above.

The magnets can be permanent magnets, in particular permanent magnets that can be switched off, or electromagnets. If switchable permanent magnets and/or electromagnets are used occur, the dismantling of the screen lining segments can be greatly simplified by switching off the magnets.

Preferably, at least one adapter is attached to the filter holder of the screening machine by means of a detachable screw connection; in particular, the adapter can be attached to the filter holder by means of a screw connection that can be actuated from below, with the screen lining segments being arranged on the upper side of the filter holder.

The term "upper side" designates the side of the screen lining segments on which the screenings to be processed are applied.

Screws can reach through holes in the adapter and the filter holder of the screening machine from above, and nuts can be placed and tightened on the threads from below. In this way, a particularly simple and easily accessible assembly of the screw connections for attaching the adapter to the portafilter of the screening machine is possible. The use of adapters enables the fastening system according to the invention to be used with a wide variety of screening machine types, since this enables retrofitting.

A plurality of adapters are preferably fastened to the filter holder of the screening machine, with each adapter having a plurality of magnets, in particular arranged equidistantly.

By arranging a plurality of magnets, the sufficient and also uniform magnetic holding force can be generated.

Preferably, the portafilter and/or a plurality of adapters has/have a plurality of guide elements, along which the screen mat segment slides during assembly on the portafilter and is guided into its final assembly position.

The arrangement of a plurality of guide elements improves the guidance of the screen mat segment and further simplifies assembly. The guide elements are preferably formed by projections with sloping planes on the filter holder and/or on the adapters, which engage in corresponding recesses on the screen mat segment and cause the screen mat segment to slide along the sloping planes into the final assembly position.

Alternatively or cumulatively, the guide elements are formed by recesses with sloping planes on the filter holder and/or on adapters, into which corresponding projections on the screen mat segment engage and cause the screen mat segment to slide along the sloping planes into the final assembly position.

The interaction of projections and corresponding recesses causes at the same time a shear absorption for dissipating the shear forces from the screen mesh into the screen carrier of the screening machine.

The guide elements are preferably formed by cones and/or truncated cones and/or pyramids and/or truncated pyramids and/or triangular strips which interact with corresponding recesses.

In these cases, the guide elements are formed by positioning pegs in the form of cones and/or truncated cones and/or pyramids and/or truncated pyramids and/or triangular strips, which engage in corresponding recesses and, by sliding along the slopes of these positioning pegs, allow the screen mesh segment to slide automatically into bring about its final assembly position and at the same time form a shear absorption for dissipating shear forces from the screen lining segment during operation in the portafilter. If guide elements in the form of triangular strips are used, these stand on the portafilter or on the adapter like a pitched roof. These guide elements in the form of triangular strips can in turn have beveled corners at the head ends of the triangular strips, so that in this case the guide elements have the shape of a hipped roof and thus bevels in all four cardinal directions exhibit. Due to these bevels, the fitted screen lining segment is automatically guided into the final assembly position during assembly.

Furthermore, the guide elements can be designed in the form of strips with a semi-circular cross section.

By designing these positioning pins in the form of cones and/or truncated cones and/or pyramids and/or truncated pyramids, the bevels on the positioning pins ensure automatic sliding of the screen mat segments into the respective final assembly position in all four directions. This further facilitates assembly. In particular, it is possible for the screen lining segments to be gripped by a robot arm and placed on the vibration-excitable screen carrier. The previously explained configuration of the positioning pins in the form of cones and/or truncated cones and/or pyramids and/or truncated pyramids and the automatic guidance in all four cardinal points also makes automated assembly using a robot easier. The robotic arm can seize the screen cloth segments in particular electromagnetically and/or mechanically.

One or more ferromagnetic coupling elements are preferably cast into each screen cloth segment and/or the ferromagnetic coupling element is formed by the screen cloth segment itself. The ferromagnetic coupling element can be formed by iron or an iron alloy.

A screen mesh segment is preferably made of plastic such as polyurethane and ferromagnetic elements such as metal sheets and/or ferromagnetic angles and/or ferromagnetic wire mesh are cast into the material matrix of the screen mesh segment to enable magnetic attachment of the screen mesh segment.

A screen deck can be made entirely of plastic, a hybrid of plastic with wire mesh, a perforated plate, or just perforated plate.

The ferromagnetic coupling element can be designed in one piece or in several pieces, in particular as a cast-in core which is embedded in the matrix of a screen lining segment.

In addition to the magnetic attachment of the screen cloth segment made of plastic such as polyurethane, the metal sheets and/or angles and/or wire mesh cast into the material matrix of the screen cloth segment also serve to stiffen the screen cloth segment and increase the creep strength of the screen cloth segment.

Furthermore, the ferromagnetic coupling element of a screen mat segment can be formed by a perforated plate made of ferromagnetic material, which forms a carrier for screen media, in particular fabric.

In particular, the ferromagnetic coupling element can be designed continuously or in sections parallel to the course of an elongate adapter.

The filter holder preferably has a plurality of filter holder sections and/or a plurality of adapters with a regular arrangement, which form a plurality of fields each for receiving a screen cloth segment, with the screen cloth segments having a square or rectangular basic shape and/or with the screen cloth segments forming a peripheral section of a cylinder jacket or a truncated cone jacket .

Such a configuration allows a screen bottom or a screen drum to be formed from a plurality of regularly arranged screen lining segments. Due to the fact that each screen lining segment only has one Forming part of such a sieve floor or a sieve drum, the replacement of the sieve lining segments is facilitated.

A screening machine according to the invention with a screen carrier for accommodating a plurality of screen lining segments to form a screen base has such a fastening system as described above for fastening replaceable screen lining segments to the screening machine.

A screening machine with a vibration-excitable screen carrier for receiving a plurality of screen lining segments to form a screen base is particularly advantageous, in which the vibration-excitable screen carrier has a magnetic fastening system according to the invention.

The screening machine according to the invention can thus in particular be a single-deck or multi-deck screening machine with at least one vibration-excitable screen carrier for receiving a plurality of screen lining segments to form at least one screen bottom.

Furthermore, the screening machine according to the invention can be a drum screening machine in which several screen lining segments form a cylindrical or truncated cone-shaped screening drum that can be driven in rotation. In this case, the portafilter can thus be formed by the carrying basket of a drum screening machine.

Fig. 1

Zwei Ausführungsbeispiele von Adapterleisten für C-Profile mit einer ersten Variante von Führungselementen;

Fig. 2

vier Ausführungsbeispiele von Adapterleisten für Winkelprofile mit der ersten Variante von Führungselementen;

Fig. 3

Ausschnitte der Anordnung von Siebbelagsegmenten bei einem ebenen Siebboden sowie bei einem Trommelsieb;

Fig. 4

ein Siebbelagsegment zur Montage an Adapterleisten nach den Figuren 1 und 2 in mehreren Ansichten;

Fig. 5

perspektivische Ansichten einer Adapterleiste und eines Siebbelagsegmentes mit der ersten Variante von Führungselementen;

Fig. 6

schematische Darstellungen der Montage eines Siebbelagsegmentes von unten bzw. von oben bei einer Eindeckersiebmaschine sowie die Anordnung der Siebbelagsegmente bei einer Mehrdeckersiebmaschine;

Fig. 7

eine Seitenadapterleiste mit der ersten Variante von Führungselementen in mehreren Ansichten;

Fig. 8

zwei Ausführungsbeispiele von Adapterleisten für C-Profile mit einer zweiten Variante von Führungselementen;

Fig. 9

vier Ausführungsbeispiele von Adapterleisten für Winkelprofile mit der zweiten Variante von Führungselementen;

Fig. 10

ein Siebbelagsegment zur Montage an Adapterleisten nach den Figuren 8 und 9 in mehreren Ansichten;

Fig. 11

perspektivische Ansichten einer Adapterleiste und eines Siebbelagsegmentes mit der zweiten Variante von Führungselementen;

Fig. 12

die Anordnung der Anordnung der Siebbelagsegmente bei einer Eindeckersiebmaschine sowie bei einer Mehrdeckersiebmaschine;

Fig. 13

eine Seitenadapterleiste mit der zweiten Variante von Führungselementen in mehreren Ansichten;

Fig. 14

die Montage/Demontage eines Siebbelagsegmentes mittels eines Roboterarmes.

Several exemplary embodiments of the invention are shown in the figures and are explained below. Show it:

1

Two exemplary embodiments of adapter strips for C-profiles with a first variant of guide elements;

2

four exemplary embodiments of adapter strips for angle profiles with the first variant of guide elements;

3

Sections of the arrangement of screen lining segments in a flat screen bottom and in a drum screen;

4

a screen lining segment for mounting on adapter strips according to figures 1 and 2 in multiple views;

figure 5

perspective views of an adapter bar and a screen lining segment with the first variant of guide elements;

6

schematic representations of the assembly of a screen cloth segment from below and from above in a single-deck screening machine and the arrangement of the screen cloth segments in a multi-deck screening machine;

7

a side adapter bar with the first variant of guide elements in several views;

8

two exemplary embodiments of adapter strips for C-profiles with a second variant of guide elements;

9

four exemplary embodiments of adapter strips for angle profiles with the second variant of guide elements;

10

a screen lining segment for mounting on adapter strips according to figures 8 and 9 in multiple views;

11

perspective views of an adapter bar and a screen lining segment with the second variant of guide elements;

12

the arrangement of the arrangement of the screen lining segments in a single-deck screening machine and in a multi-deck screening machine;

13

a side adapter bar with the second variant of guide elements in several views;

14

the assembly/disassembly of a screen lining segment using a robot arm.

Identical components are provided with identical reference symbols in the figures.

In figure 1 two exemplary embodiments of adapter strips 10 for C-profiles are shown with a first variant of guide elements 11.

For mounting the adapter bar 10 to figure 1 on a C-profile of the filter holder of the screening machine, the adapter strip 10 has correspondingly designed feet 13 with undercuts on the underside, which engage in the C-profile and with the undercuts of the feet 13 lie in the C-profile of the filter holder of the screening machine in a form-fitting manner and fix the adapter strip 10 to the C-profile.

For attaching the adapter strip 10 to figure 1 on a C-profile of the portafilter of the screening machine, the feet 13 of the adapter strip 10 are hammered into corresponding openings in the portafilter of the screening machine.

In figure 2 four exemplary embodiments of adapter strips 10 for angle profiles with the first variant of guide elements 11 are shown. The adapter strips 10 for mounting on angle profiles have on their underside a plurality of feet 14 which are distributed equidistantly over the length of the adapter strip 10 and which pass through corresponding bores in the angle profiles which support the adapter strips. The adapter strips 10 are attached to the angle profiles by screwing in fastening screws from the underside into the feet 14 of the adapter strips 10 . The feet 14 are designed as expansion anchors and are widened by the screw that is screwed in.

The adapter strips 10 after figures 1 and 2 have on their upper side a plurality of guide elements 11 arranged equidistantly over the length, which in the first variant of these guide elements 11 are designed in the form of two positioning pins in the shape of a hipped roof. The upper side of the adapter strips 10 designates that side on which the screen lining segments are placed. The geometric shape of these projections in the shape of a hip roof thus corresponds to a triangular strip with beveled corners. The longitudinal extent of these hipped roof-shaped projections runs parallel to the longitudinal extent of the adapter bar 10 and thus also parallel to the course of the side edge of the screen cloth segment 30 to be mounted on the adapter bar 10.

The guide elements 11 in the form of triangular strips have beveled corners at the head ends of the triangular strips, so that in this case the guide elements 11 have the shape of a hipped roof and thus have bevels in all four cardinal directions. Due to these bevels, the fitted screen lining segment 30 is automatically guided into the final assembly position during assembly.

Magnets 12 are integrated into the adapter strips 10, which are used for the magnetic connection between the magnets 12 and the screen lining segment. Several magnets 12 are arranged equidistantly over the length of the adapter strips 10 . The number of magnets 12 and the magnetic field strength of the magnets 12 is selected depending on the load and adjusted accordingly in order to ensure a secure and vibration-proof hold of the screen lining segments. In the illustrated embodiment, the magnets 12 are permanent magnets.

figure 3 shows the arrangement of screen lining segments 30 with a flat screen bottom ( Figure 3a ) as well as with a drum screen ( Figure 3b ). Furthermore, in figure 3 the attachment of the adapter strips 10 to the angle profiles 35 can be seen. In this case, the angle profiles 35 thus form the screen carrier of the screening machine, which accommodates the screen lining segments. They are fastened Adapter strips 30 on the angle profiles 35 by means of screws that are screwed into the feet 14 of the adapter strips 10 from below.

figure 4 shows a screen lining segment 30 for mounting on adapter strips 10 according to FIG figures 1 and 2 in multiple views. The recesses 31 made on the underside of the screen mat segment 30 can be seen, which correspond to the guide elements 11 of the adapter strips 10 and into which the guide elements 11 engage in the assembled state. The underside of the screen lining segment 30 designates that side which rests on the adapter bar 10 in the assembled state.

Ferromagnetic steel elements 32 are cast into the screen mesh segment 30, which serve both to stiffen the screen mesh segment 30 and a ferromagnetic coupling element to produce the magnetic connection to the magnets 12 of the adapter bars 10 and thus the magnetic attachment of the screen mesh segments 30 to the adapter bars 10. The cast-in steel elements 32 close laterally flush with the screen of the screen lining segment 30 on the underside.

figure 5 shows perspective views of an adapter strip 10 and a screen lining segment 30 with the first variant of guide elements 11. Easily recognizable in the perspective view figure 5 is the longitudinal extension of the hip roof-shaped guide elements 11, the longitudinal extension of which runs parallel to the longitudinal extension of the adapter bar 10 and parallel to the side edge of the screen mat segment 30.

At the moment a screen mat segment 30 is placed on the adapter strips 10, the guide elements 11 engage in the corresponding recesses 31 in the screen mat segments 30 and automatically guide the screen mat segments 30 along the bevels of the guide element 11 into the final assembly position on the screen carrier of the screening machine. The filter holder of the screening machine receiving the screen lining segments 10 accordingly points indirectly via the magnets 12 integrated in the adapter strips 10 Magnets 12 for magnetic attachment of the screen lining segments 30. The slanted guide elements 11 act like sliding ramps when the screen mesh segments 30 are placed on the adapter strips 10 for fastening the screen mesh segments to the screen carrier of the screening machine and, due to the magnetic forces acting at the same time, cause the screen mesh segments 30 to be automatically positioned when the screen mesh segments 30 are placed on. At the same time, the pairing forms of the guide elements 11 of the adapter strips 10 and the corresponding recesses 31 of the screen panel segments 30 form a positive fit in the final assembly position and forms a thrust receptacle for dissipating shear forces from the screen panel segments 30 into the screen carrier of the screening machine that accommodates the screen panel segments 30.

In figure 6 are schematic representations of the assembly of a screen mat segment 30 from below ( Figure 6a ) or from above ( Figure 6b ) in a single-deck screening machine and the arrangement of the screen lining segments in a multi-deck screening machine ( Figure 6c ) pictured.

figure 7 shows a side adapter bar 10' in several views for combination with adapter bars 10 with the first variant of guide elements 11. This side adapter bar 10' is intended for attachment to a side wall of the screening machine and forms the lateral end of a flat screen bottom.

In figure 8 two exemplary embodiments of adapter strips 20 for C-profiles with a second variant of guide elements 21 are shown.

For mounting the adapter strip 20 to figure 8 on a C-profile of the filter holder of the screening machine, the adapter strip 20 has correspondingly designed feet 23 with undercuts on the underside, which engage in the C-profile and lie with the undercuts of the feet 23 in the C-profile of the filter holder of the screening machine in a form-fitting manner and fix the adapter strip 20 to the C-profile.

For attaching the adapter strip 20 to figure 8 on a C-profile of the portafilter of the screening machine, the feet 23 of the adapter strip 20 are hammered into corresponding openings in the portafilter of the screening machine.

In figure 9 four exemplary embodiments of adapter strips 20 for angle profiles with the second variant of guide elements 21 are shown. The adapter strips 20 for mounting on angle profiles have on their underside a plurality of feet 24 which are distributed equidistantly over the length of the adapter strip 20 and which pass through corresponding bores in the angle profiles which support the adapter strips. The adapter strips 20 are fastened to the angle profiles by screwing in fastening screws from the underside into the feet 24 of the adapter strips 20 . The feet 24 are designed as expansion anchors and are widened by the screw that is screwed in.

The adapter strips 20 after figures 8 and 9 have on their upper side a plurality of guide elements 21 arranged equidistantly over the length, which in this second variant of the guide elements 21 are each in the form of a truncated pyramid. Each truncated pyramid is thus designed as a projection which is bevelled on all sides. The upper side of the adapter strips 20 designates that side on which the screen lining segments 30 are placed. The geometric shape of these projections thus corresponds to a truncated pyramid of a square pyramid. A plurality of these guide elements 21 are arranged equidistantly along the longitudinal extent of the adapter strips 20 .

The guide elements 21 in the form of truncated pyramids have bevels in all four cardinal directions. Due to these bevels, the fitted screen lining segment 30 is automatically guided into the final assembly position during assembly.

Magnets 22 are integrated into the adapter strips 20 and are used for the magnetic connection between the magnets 22 and the screen lining segment. It several magnets 22 are arranged equidistantly over the length of the adapter strips 20 . The number of magnets 22 and the magnetic field strength of the magnets 22 is selected depending on the load and adjusted accordingly in order to ensure a secure and vibration-proof hold of the screen lining segments. In the illustrated embodiment, the magnets 22 are permanent magnets.

figure 10 shows a screen lining segment 33 for mounting on adapter strips 20 according to FIG figures 8 and 9 in multiple views. The recesses 34 made on the underside of the screen lining segment 33 can be seen, which correspond to the guide elements 21 of the adapter strips 20 and into which the guide elements 21 engage in the assembled state. The underside of the screen lining segment 33 designates that side which rests on the adapter bar 20 in the assembled state.

Ferromagnetic steel elements 32 are cast into the screen mesh segment 33, which serve both to stiffen the screen mesh segment 33 and a ferromagnetic coupling element to produce the magnetic connection to the magnets 22 of the adapter bars 20 and thus the magnetic attachment of the screen mesh segments 33 to the adapter bars 20. The cast-in steel elements 32 close laterally flush with the screen of the screen lining segment 33 on the underside.

figure 11 shows perspective views of an adapter bar 20 and a screen mat segment 33 with the second variant of guide elements 21 in the form of truncated pyramids. Two adjacent screen mesh segments 33 abut each other and the recesses 34 arranged on both screen mesh segments 33, which are opposite each other, share a corresponding guide element 21 on the adapter strip 20.

At the moment a screen panel segment 33 is placed on the adapter strips 20, the guide elements 21 engage in the corresponding recesses 33 on the side edges of the screen panel segments 33 and guide them Screen lining segments 33 along the bevels of the guide element 21 automatically in the final assembly position on the portafilter of the screening machine. Via the magnets 22 integrated in the adapter strips 20 , the screen carrier of the screening machine that accommodates the screen media segments 20 has accordingly indirectly magnets 22 for magnetic attachment of the screen media segments 33 . The slanted guide elements 21 in the form of truncated pyramids act like sliding ramps when the screen mesh segments 33 are placed on the adapter strips 20 for fastening the screen mesh segments to the screen carrier of the screening machine and, due to the magnetic forces acting at the same time, automatically position the screen mesh segments 33 when the screen mesh segments 33 are placed. At the same time, the pairing of the guide elements 21 of the adapter strips 20 and the corresponding recesses 34 of the screen mesh segments 33 in the final assembly position forms a form fit and forms a thrust absorber for dissipating shear forces from the screen mesh segments 33 into the screen carrier of the screening machine that accommodates the screen mesh segments 33.

In figure 12 is the arrangement of the screen lining segments 33 in a single-deck screening machine ( Figure 6a ) and the arrangement of the screen lining segments 33 in a multi-deck screening machine ( Figure 6b ) pictured.

figure 13 shows a side adapter bar 20' in several views for combination with adapter bars 20 with the second variant of guide elements 21. This side adapter bar 20' is intended for attachment to a side wall of the screening machine and forms the lateral end of a flat screen bottom. To a screen lining segment 33 after the figures 10 and 11 the guide element 21' of the side adapter strip 20' is correspondingly designed as a bisected truncated pyramid.

As an alternative to the permanent magnets used in the exemplary embodiments shown, switchable electromagnets can be used. A shutdown of these electromagnets with the result of the omission of magnetic holding force simplifies the dismantling of the screen lining segments considerably.

figure 14 shows the assembly and disassembly of a screen lining segment 33 by means of a robot arm 50 on the vibration-excitable screen carrier 40 of a screening machine. An adapter strip 20 with integrated permanent magnets is arranged on the filter holder 40 . On the upper side receiving the screen lining segment 33, the adapter bar 20 has a plurality of equidistantly arranged guide elements 21 in the form of truncated pyramids. When the screen mesh segment 33 is in the installed state, these guide elements 21 engage in corresponding recesses 34 in the screen mesh segment 33 .

For assembly or disassembly of the screen mat segment 33 , the screen mat segment 33 is gripped by a robot arm 50 and placed on the adapter bar 20 or lifted off the adapter bar 20 . For this purpose, the robot arm 50 has switchable electromagnets 51 whose magnetic holding force is so great that the magnetic holding force of the permanent magnets integrated into the adapter strips 20 can be overcome.

By means of a robot arm 50 an automated dismantling of the screen lining segments 33 after the wear limit has been reached and a new covering of the screen bottom with new screen lining segments 33 is possible. The robotic arm 50 grips the screen mesh segments 33 magnetically using the switchable electromagnets 51 integrated into the robotic arm.

Alternatively or cumulatively, the robot arm can have grippers and/or claws, by means of which a positive and/or non-positive gripping of the screen mat segment 33 is possible in order to mount or dismantle the screen mat segment 33 .

Claims (15)

Fastening system for fastening replaceable screen cloth segments (30, 33) to a screening machine with at least one screen holder (40) receiving one or more screen cloth segments (30, 33), one or more magnets (12, 22 ) are arranged, the magnets (12, 22) interacting with at least one vibration-proof ferromagnetic coupling element (32) arranged in or on each screen mesh segment (30, 33) and thereby creating a magnetic connection between the magnets (12, 22) and the screen mesh segment ( 30, 33) and the screen cloth segment (30, 33) is magnetically coupled to the screen holder (40), characterized in that the screen holder (40) itself and/or at least one adapter (10, 20 ) has at least one guide element (11, 21) along which the screen mat segment (30, 33) slides during assembly and is guided into its final assembly position on the screen carrier (40). Fastening system according to Claim 1, characterized in that at least one adapter (10, 20) is fastened to the filter holder (40), the adapter (10, 20) having at least one magnet (12, 22). Fastening system according to Claim 1, characterized in that the magnets (12, 22) are permanent magnets, in particular permanent magnets which can be switched off, or electromagnets. Fastening system according to Claim 1 or 2, characterized in that at least one adapter (10, 20) is fastened to the filter holder (40) of the screening machine by means of a detachable screw connection, in particular that the adapter (10, 20) is attached to the portafilter (40) by means of a screw connection that can be actuated from below, the screen media segments (30, 33) being arranged on the top of the portafilter (40). Fastening system according to one of the preceding claims, characterized in that a plurality of adapters (10, 20) are fastened to the filter holder (40) of the screening machine, each adapter (10, 20) having a plurality of magnets (12, 22), in particular arranged equidistantly . Fastening system according to one of the preceding claims, characterized in that the portafilter (40) and/or a plurality of adapters (10, 20) have a plurality of guide elements (11, 21) on which the screen lining segment (30, 33) is held during assembly on the portafilter ( 40) slides along and is guided into its final assembly position. Fastening system according to one of the preceding claims, characterized in that the guide elements (11, 21) are formed by projections with inclined planes on the portafilter (40) and/or on the adapters (10, 20) which fit into corresponding recesses (31, 34) engage on the screen cloth segment (30, 33) and cause it to slide along the inclined planes into the final assembly position of the screen cloth segment (30, 33). Fastening system according to one of the preceding claims, characterized in that the guide elements are formed by recesses with inclined planes on the filter holder (40) and/or on adapters (10, 20) into which corresponding projections on the filter lining segment (30, 33) engage and cause the screen cloth segment (30, 33) to slide along the inclined planes into the final assembly position. Fastening system according to one of the preceding claims, characterized in that the guide elements (11, 21) by cones and/or truncated cones and/or pyramids and/or truncated pyramids and/or strips, in particular triangular strips or strips with a semicircular cross-section, which interact with corresponding recesses. Fastening system according to one of the preceding claims, characterized in that one or more ferromagnetic coupling elements (32) are cast into each screen mesh segment (30, 33) and/or that the ferromagnetic coupling element (32) is formed by the screen mesh segment (30, 33) itself . Fastening system according to one of the preceding claims, characterized in that a screen covering segment (30, 33) consists of plastic, in particular polyurethane, and ferromagnetic elements (32) and/or ferromagnetic sheets and/or ferromagnetic angles and/or ferromagnetic wire mesh are incorporated into the material matrix of the Screen mesh segment (30, 33) are cast / is to allow magnetic attachment of the screen mesh segment (30, 33). Fastening system according to one of the preceding claims, characterized in that the portafilter (40) has a plurality of portafilter sections and/or a plurality of adapters (10, 20) with a regular arrangement, which form a plurality of fields each for receiving a screen cloth segment (30, 33), wherein the screen cloth segments (30, 33) have a square or rectangular or trapezoidal basic shape and/or wherein the screen cloth segments (30, 33) form a peripheral section of a cylinder jacket or a truncated cone jacket. Screening machine with at least one screen holder (40) for receiving a plurality of screen lining segments (30, 33), characterized in that the screening machine has a fastening system according to one of the preceding claims. Screening machine according to Claim 13, characterized in that the screening machine is a single-deck or multi-deck screening machine with at least one vibration-excitable screen carrier (40) for receiving a plurality of screen lining segments (30, 33) to form at least one screen bottom. Screening machine according to Claim 13, characterized in that the screening machine is a drum screening machine in which a plurality of screen lining segments (30, 33) form a cylindrical or truncated cone-shaped screening drum which can be driven in rotation.

Images