EP2878385A1 - Star screen - Google Patents

Abstract

In a star screen comprising a drive (8), frame profiles (7.1, 7.2) and substantially parallel to each other arranged screening shafts (2.1, 2.2) arranged thereon with screening stars (3), every second screening shaft (2.1) is substantially orthogonal to at least one of Frame profiles (7.1, 7.2) can be mobilized.

Description

The present invention relates to a star screen according to independent claim 1.

STATE OF THE ART

In order to promote recyclables, such as household or industrial waste and organic materials such as compost, soil, wood and the like or gravel, loosen up and possibly classify, various devices are known. Such devices are often used for example in mining, agriculture or in the recycling industry use.

Particularly noteworthy here are star screens. The latter are suitable for simultaneously transporting, loosening, shredding and classifying the goods to be treated.

A star screen comprises star screen waves arranged essentially parallel to one another and arranged one behind the other in the form of a conveyor belt. On the Sternsiebwellen are arranged star stars. Adapted to the respective requirements, screening stars can be made of a flexible material, such as plastic, or of essentially non-deformable material, such as steel. Furthermore, a contour and surface texture of the star screens according to the prior art is also adapted to the requirements of them. Known screening stars, also referred to as screen disks, are in the simplest case essentially cylindrical disks with fingers or tines extending substantially radially from the center of the screen star and indentations therebetween, wherein the screen stars are generally arranged coaxially and non-rotatably on the screen shaft.

Depending on the configuration of the star screen and, in particular, depending on the design of the screen stars used here, one or more of the aforementioned functions can be used to transport, loosen, shred and classify goods at the same time.

For example, if the screen stars are configured to facilitate comminution of the item to be transported, e.g. recyclable materials, for example, points or sharp edges on the screen stars can be provided for this purpose.

Distances or cavities between the screen stars and waves furthermore determine the minimum particle size necessary for transport through the star screen. A smallest in the star screen existing clear width or the smallest in the star screen existing distance between the individual components of the star screen is called the separation distance. He gives that maximum diameter of a spherical particle, which is not transported by the star screen, but instead falls through this or slips through.

Spherical particles with a larger diameter or generally arbitrarily shaped particles, the smallest diameter of which is greater than the separation distance, do not fall through the openings existing between the sieve shafts and the screen stars and can be transported further. Particles whose largest diameter is smaller than the separation distance fall through the existing between the screen shafts and the screen stars openings and can be collected, for example, by a located below the star screen conveyor belt or simply sorted out in this way.

If moist or sticky material is processed or transported, it adheres at least partially to the screen shafts and screen stars. On the one hand, the comminution function is impaired by correspondingly shaped hooks, edges and sections of the screen fingers or tines; on the other hand, the minimum size of the openings through which particles with a smaller diameter can fall is also reduced, as a result of which just do not fall through the openings between the screen stars and the screen shafts. Viewed in a top view, material adhering to the screen and screen waves acts as an undercut of the apertures existing between the screen stars and screen shafts and defining the minimum size a particle must have to be transported straight by the star screen without passing through the apertures slide through. Thus, this separation distance defining opening is reduced, thereby changing a classification function of the star screen in the course of a machining process and can not be specified by a user exactly. A disadvantage of known star screens is on the one hand that the star screen is not easy to clean. On the other hand, known star screens have the disadvantage that a change in the separation distance is not readily possible.

TASK

The object of the present invention is to overcome the disadvantages of the prior art. In particular, a star screen is to be provided which allows a simple way to change the separation distance and which is easy to clean.

SOLUTION OF THE TASK

To achieve the object, the features of claim 1.

According to the invention, a star screen comprises a drive, outer frame profiles and screen shafts. The screen shafts are in this case arranged substantially parallel to one another and in the manner of a conveyor belt. Screen stars are arranged on the screen shafts. According to the invention, it is further provided that every second screening shaft is displaceably arranged along a longitudinal direction of the star screen. A shift of the screen waves takes place here substantially orthogonal to the longitudinal direction.

According to a preferred embodiment, the displacement of the screening shafts, which is orthogonal to the longitudinal direction, essentially corresponds to an axial displacement which is relative to an imaginary central longitudinal axis of the screening shafts.

Preferably, the displaceable screen shafts are designed telescopically. In this case, preference is given to the telescopically displaceable Design sieve shafts in the form of two coaxial waves, which are mutually displaceable.

However, it may also be conceived to design a single sieve shaft guided in a bearing slidably, with no coaxially associated waves are necessary.

The star screen is provided with a drive, for example in the form of an electric motor. The screen shafts, for example, gears may be formed, which are driven by a chain operated by means of the drive. Other types of drive, such as belt drives and the like, are intended to be encompassed by the present invention. It is also possible to provide a plurality of separate drives for a certain number of screen shafts, for example in order to operate the screen shafts at different speeds, or to provide sufficient force for the screen shafts to be operated by a single drive.

According to one exemplary embodiment of the present invention, the displaceable screen shafts can be brought into operative connection with a thrust mount at one end. A thrust mount, for example, serves to simultaneously move each second shaft, whereby individual, for each second shaft separately associated means for movement or displacement can be saved. Another advantage of a thrust mount is that the movement of each second wave of the star screen synchronized, so it can run simultaneously and uniformly.

In the operative connection can be thought, for example, an outer of two coaxially associated waves of Siebwellen fabric or positively connected to the thrust mount. On the other hand, it may also be thought to provide means by which the thrust mount with the sliding shafts of the individual screening shaft in Active connection can occur, with thrust mount and waves not permanently material or form-fitting must be in operative connection with each other.

According to one embodiment, the thrust mount is associated with at least one of the frame profiles displaced. For this purpose, all means are suitable that allow a shiftable assignment of frame profile (s) and thrust mount. To be encompassed are all guide elements, which are for example mounted on the frame profile (s) and / or the slide mount, and are in operative connection with the slide mount or the frame profile (s) or can be brought into operative connection. These include, for example, guide rails, guide pins and the like, wherein corresponding corresponding means can always be provided which ensure reliable guidance of the elements. For example, if the thrust mount is associated with a guide pin, the frame profile (s) preferably has a corresponding guide bearing for the guide pin. The same applies to a provided on the / the frame profile (s) guide rail, which preferably corresponds to a engaging in the rail means of the slide holder. In this case, a displaceable assignment can be made possible by all means or devices which are substantially complementary to one another and which are displaceable relative to one another substantially in a predetermined direction.

According to a preferred embodiment, the guide elements should be designed to allow only with respect to the screen shafts axial displacement of the thrust mount.

According to one embodiment of the invention, the thrust mount is movable by means of an eccentric. Preferably, an eccentric drive is assigned to the eccentric in this case. Such a drive may be any suitable motor, such as an electric motor.

Particularly preferred here is an arrangement according to which the eccentric and the eccentric drive are associated with one of the frame profiles, for example by screwing. A connection between eccentric and thrust holder can be done via a connecting rod or the like, which is associated with both the eccentric and the thrust mount and thus transmits a movement of the eccentric on the thrust mount.

The present invention is intended to further encompass other means for moving or displacing the thrust mount. In question here are any facilities that are suitable to move the thrust mount.

From the present invention, therefore, in addition to eccentrics, other means for moving or shifting the thrust mount to be included, for example, crank mechanism such as crank gear, further wrap, spur gear, magnetic, hydraulic and pneumatic drives and the like.

Depending on the length of the star screen, several means for moving or shifting the thrust mount may be included. Furthermore, it can be provided to provide a plurality of thrust mounts, each with one or more means for movement. Thus, for example, over the length of the star screen away zones can be created whose sieve shafts can be moved independently.

According to a preferred embodiment, the screen stars are arranged equidistantly on the screen shafts, ie, the distances between two adjacent screen stars are identical. The same applies to the distances between two adjacent screen shafts to each other. The separation distance or the largest opening existing between screen stars and screen shafts is essentially determined by the distances between the screen stars and screen shafts specified. Preferably, the distances between the screen stars are chosen so that at a full revolution performed by the eccentric, which is transmitted by means of the connecting rod to the thrust mount and thus on the sliding screen shafts, the screen stars approach each other, but do not touch. If a full revolution of the eccentric is made possible by an appropriate dimensioning of screen stars and screen shafts and a vote of the dimensions of eccentric, eccentric drive and connecting rod and thrust mount, this leads to a simple cleaning of the star screen can be performed. Advantageously, adjacent screening shafts are spaced such that the screening stars of adjacent screening shafts at least partially mesh. If, as a result of the above-described movement starting from the eccentric drive, then every other screening shaft is alternately displaced axially, wherein in the case of a complete rotation of the eccentric a forward and backward movement of the thrust mount is carried out. Thus, intermeshing screen stars of adjacent screen shafts come so close together to strip adhering sticky material which affects the separation distance.

The present invention is intended to further encompass that, on the one hand, the screen stars of a screen shaft and, on the other hand, adjacent screen shafts are not arranged equidistantly. By adjusting the deflection of the eccentric or the Schubhalterung the cleaning function described above is still possible.

Furthermore, a cleaning function is also possible if the eccentric does not make a full turn. It is important for a successful cleaning only that the screen stars of adjacent screen shafts come closer, so that a stripping of adhering material is made possible.

Another advantage of the movement performed by the eccentric, in particular in the form of a full revolution, is that it is a variation of the Separation distance allows. As already stated above, preferably the screen stars of a shaft are arranged equidistant to one another and adjacent shafts to one another. Thus, the separation distance is minimal. If the sieve shafts are moved alternately by movement of the eccentric, ie shifted every second sieve shaft in the longitudinal direction, the spacing of the sieve stars on adjacent sieve shafts changes. Since the displaceable screen shafts are displaced simultaneously in the same direction, compared to the original arrangement or configuration arise both larger and smaller distances. However, since the separation distance is predetermined by the largest existing openings or distances of screening waves and screening stars of the star screen, the separation distance by displacement of the screen waves starting from an equidistant arrangement is always greater. The maximum separation distance is reached at full deflection of the eccentric, ie, when the distance from adjacent screen stars or screen shafts both minimal on the one hand and on the other hand maximum, since the largest existing distance at a given configuration, ie at a given position of the eccentric or the Schubhalterung, specifies the separation distance.

According to one exemplary embodiment, one or more sensors are furthermore provided for monitoring the position or position of the thrust mount and / or the displaceable shafts of the screen shafts. This should include all suitable sensors, such as non-contact sensors such as infrared sensors, magnetic sensors and the like.

It may also be intended to a computer or other control and processing unit, which receives the signals of the sensors, processes and possibly passes them in control signals to, for example, one, several or all eccentric drives and / or one, several or all drives of the star screen.

Furthermore, it may be thought to provide sensors that monitor the synchronicity of at least two or more drives. this applies both for the drives of the star screen, which drive the screen waves, as well as for the drives of the eccentric or the device for movement or displacement. Both the displacement and the rotation of the waves proceeds as synchronously as possible according to an exemplary embodiment, which can be monitored or controlled and regulated by means of sensors, optionally in conjunction with the computer described above.

figure description

• Figur 1 ein Sternsieb gemäss einem Ausführungsbeispiel der vorliegenden Erfindung in perspektivischer Ansicht von schräg unten;
• Figur 2 das Sternsieb nach Figur 1 in perspektivischer Ansicht von schräg oben;
• Figur 3 eine Seitenansicht auf das Sternsieb nach Figur 1;
• Figuren 4 eine geschnittene Ansicht des Sternsiegs entlang der Linie IV - IV in Figur 3;
• Figur 5 eine geschnittene Ansicht des Sternsiebs entlang der Linie V-V in Figur 3;
• Figur 6 eine geschnittene Teilansicht des Sternsiebs entlang der Linie VI-VI in Figur 5;
• Figur 7 eine Vorderansicht des Sternsiebs nach Figur 1;
• Figur 8 eine Draufsicht auf das Sternsieb nach Figur 1;
• Figur 9 eine Detailansicht des Sternsiebs entlang der gestrichelten Markierung in Figur 1; und
• Figur 10 eine Detailansicht des Sternsiebs nach Figur 2.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings; these show in:

• FIG. 1 a star screen according to an embodiment of the present invention in a perspective view obliquely from below;
• FIG. 2 the star screen after FIG. 1 in a perspective view obliquely from above;
• FIG. 3 a side view of the star screen behind FIG. 1 ;
• FIGS. 4 a sectional view of the star victory along the line IV - IV in FIG. 3 ;
• FIG. 5 a sectional view of the star screen along the line VV in FIG. 3 ;
• FIG. 6 a sectional partial view of the star screen along the line VI-VI in FIG. 5 ;
• FIG. 7 a front view of the star screen behind FIG. 1 ;
• FIG. 8 a plan view of the star screen behind FIG. 1 ;
• FIG. 9 a detail view of the star screen along the dashed marking in FIG. 1 ; and
• FIG. 10 a detailed view of the star screen after FIG. 2 ,

In FIG. 1 is a star screen 1 shown. The star screen 1 comprises two outer C-shaped frame sections 7.1 and 7.2, which are connected to one another via connecting webs 20. Sieve shafts 2.1 and 2.2 are arranged between the outer frame profiles 7.1 and 7.2 and mounted via bearings 12 in the frame profiles 7.1 and 7.2. This is in FIG. 9 good to see. On the screen shafts 2 screen stars 3 are arranged, as also in FIG. 9 is recognizable. The screen shafts 2.1 are also designed to be displaceable and therefore comprise inner square tubes 17.1 and outer square tubes 17.2 and drive plates 18.

The frame profile 7.1 eccentric 5 are assigned with eccentric 15. The individual eccentric 5 is further associated with a connecting rod 13, which passes through the frame profile 7.1 with a holding element 21 (see FIG. 9 ) of a thrust mount 4 is rotatably connected. Essentially opposite the frame profile 7.2, a limiting portion 22 is formed, which is shaped similar to the thrust holder 4, in contrast to the thrust holder 4, however, is firmly connected to the frame profile 7.2.

Further, guide pins 6 are provided, which are guided in guide bearings 19. Guide pin 6 and guide bearings 19 allow a sliding assignment of frame profile (s) and thrust mount.

The frame profile 7.2 are compared to the eccentrics 5, 8 drives assigned, as in FIG. 2 recognizable. The drives 8 are connected to chains 9, which are guided around gears 11. These, in turn, are assigned to the screening shafts 2 in an anti-rotation manner. Thus, the screen shafts 2 of the star screen 1 are driven.

Referring to the Figures 1-10 explains the operation of the inventive star screen 1 as follows:

As in the FIGS. 4 and 5 recognizable, the screen shafts 2.1, 2.2 assigned to the frame profile 7.1 or connected via bearings 12 with this. The frame profile 7.1 and 7.2 and the screening shafts 2 essentially define a longitudinal direction 14, along which a material to be machined with the star screen is transported. Along the longitudinal direction 14 - see FIG. 2 - Considered alternately every second screen shaft a sliding screen shaft 2.1. The latter are telescopically displaceable, wherein the inner square tubes 17.1 and the outer square tubes 17.2 ensure that a transmitted via the chains 9 to the gears 11 of the sliding screen shafts 2.1 rotation also results in a rotation of the outer square tubes 17.2 operatively connected to the screen stars 3. The inner square tube 17.1 is connected as an external square with the driven gear 11 in conjunction and transmits the rotation on the screen stars 3 supporting outer square tube 17.2. The movement of the displaceable screen shafts 2.1 is made possible by the movement of the eccentric 5, which is transmitted by means of the connecting rod 13 to the thrust mount 4, which in turn is in operative connection with the displaceable screen shafts 2.1. In this case, the guide pins 6 mounted in the guide bearings 19 ensure that the displacement of the displaceable screen shafts 2.1 or the thrust mount 4 runs exclusively in the direction of an arrow 10 or 16, ie substantially axially with respect to an imaginary central longitudinal axis of the screen shafts 2.1.

In the FIGS. 7 and 8th It can be seen that the displaceable screen shafts 2.1 and the thrust mount 4 can assume different positions or positions, while the frame profile 7.2 and the non-displaceable screen shafts 2.2 do not change their position.

Due to the displacement of the displaceable screen shafts 2.1, on the one hand, a separation distance of the star screen 1 can be adjusted and, on the other hand, cleaning of the star screen 1, in particular of the screen shafts 2.1, 2.2 and the screen stars 3 takes place. In a simple way, namely by completing a full rotation of the eccentric 5, thus cleaning the star screen 1 take place, since meshing screen stars 3 adjacent screen shafts 2.1, 2.2 approach each other and material which adheres to the screen stars 3 and the screen shafts 2.1, 2.2, automatically removed or scraped.

It should also be mentioned that the drive plate 18 can simultaneously prevent entry of material or contamination of the mutually displaceable square tubes 17.1, 17.2. <B> LIST OF REFERENCES </ b> 1 starscreen 2.1 sliding sieve shaft 2.2 fixed sieve shaft 3 screening star 4 thrust mount 5 eccentric 6 spigot 7 outer frame profile 8th drive 9 chain 10 arrow 11 gear 12 camp 13 pleuel 14 longitudinal direction 15 eccentric 16 axial direction 17.1 inner square tube 17.2 outer square tube 18 driver disc 19 guide bearing 20 connecting web 21 retaining element 22 Begrenzungsabschhnitt

Claims (10)

Starscreen comprising a drive (8), frame profiles (7.1, 7.2) and substantially parallel to each other arranged screening shafts (2.1, 2.2) arranged thereon with screening stars (3),
characterized in that
every second screening shaft (2.1) can be mobilized essentially orthogonal to at least one of the frame profiles (7.1, 7.2). Star screen according to claim 1, characterized in that the mobilizable screen shafts (2.1) are telescopically mobilisierbar. Star screen according to at least one of the preceding claims, characterized in that along a longitudinal direction (14), each second screen shaft (2.1) can be brought into operative connection with a thrust mount (4) at one end. Star screen according to claim 3, characterized in that the thrust mount (4) is associated with the frame profile (7.1) displaceable. Star screen according to claim 4, characterized in that the thrust mount (4) by means of a displacement device (5) is displaceable. Star screen according to claim 5, characterized in that the means for displacing an eccentric (5). Star screen according to at least one of claims 5 or 6, characterized by guide elements (6), suitable to exclusively one with respect to the screen shafts (2) allow axial displacement of the thrust mount (4) in the direction of an arrow (16). Star screen according to at least one of the preceding claims, characterized in that the eccentric (5) is associated with an eccentric drive (15). Star screen according to at least one of the preceding claims, characterized by an arrangement of the screen stars (3) on the screen shafts (2), which is suitable for allowing a full revolution of the eccentric (5). Star screen according to at least one of the preceding claims, characterized by sensors for detecting and / or monitoring a position or position of the thrust mount (4) and / or the mobilizable screen shafts (2.1).

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