SORTING GRID AND METHOD FOR DISMANTLING A SUPPORT SHEET EQUIPPED WITH SORTING GRID SCRATCHERS

Abstract

The invention relates to a classifying grate (1) with a machine frame (2) standing on a base plate (3) and a plurality of screen shafts (4) provided with discs (9), which are rotatably mounted one behind the other in a longitudinal direction (5) of the machine frame (2), wherein each screen shaft (4) is assigned a support plate (7) which is arranged vertically offset to the corresponding screen shaft (4) and which is equipped with scrapers (8) which extend into spaces (10) formed by adjacent discs (9) or star arms of the assigned screen shaft (4).A first connecting device (11) is connected to the machine frame (2) via a detachable connection (12) and supports at least one of the support plates (7), wherein a second connecting device (29) is attached to the machine frame (2), which, after the detachable connection (12) is released, supports the first connecting device (11) and is designed to move the first connecting device (11) in a direction (30) pointing away from the sieve shafts (4) and towards the base plate (3).

Description

[0001] The invention relates to a classifying screen with a machine frame standing on a base plate and a plurality of screen shafts provided with discs or star arms, which are rotatably mounted on the machine frame in a longitudinal direction one behind the other, wherein each screen shaft is assigned a support plate which is arranged vertically offset to the corresponding screen shaft and which is equipped with scrapers which extend into the spaces formed by adjacent discs or star fingers of the assigned screen shaft.

[0002] Furthermore, the invention relates to a method for dismantling a carrier plate of a classifying grate equipped with scrapers.

[0003] A classifying screen of the type described above is also called a roller screen and is known, for example, from DE 644 501. Such known roller screens are used for transporting and classifying bulk rock. The roller screen is usually integrated into a plant concept consisting of a feed unit, a processing unit such as a crusher, and transfer chutes. Several screen shafts are mounted on the machine frame, adapted to the specific task. The screen shafts are driven either individually or collectively by a chain and rotate in the conveying direction. The shape of the shaft components, such as discs designed as three-arc discs, star arms, or fingers, and the rotation itself convey the loose bulk rock in the longitudinal direction of the machine frame. Material smaller than the gap between the screen shafts and discs can be collected between the discs or star arms.The material passes through star-shaped arms, resulting in its classification. Below these screen shafts are scrapers, which are made of a wear-resistant material and, due to their shape and arrangement, clean the screen shafts of adhering feed material. The scrapers can be replaced or readjusted if wear increases and their scraping effectiveness decreases. To perform the adjustment, platforms or scaffolds must be erected below the classifying screen in the area of ​​the chute carrying the screened material. This usually requires extensive preparation, such as cleaning the machine. Once these preparations are complete, the scraper mounting screws must be loosened for adjustment or removed for replacement. This work is very time-consuming due to the limited working space and the limited visibility into the work area.

[0004] The invention is based on the objective of creating a solution that provides an improved classifying grate in a structurally simple manner, characterized by easy adjustment or replacement of scrapers.

[0005] In a classifying grate of the type described at the beginning, the problem is solved according to the invention in that a first connecting device is connected to the machine frame via a detachable connection and supports at least one of the support plates, wherein a second connecting device is attached to the machine frame, which, after the detachable connection has been released, supports the first connecting device and which is designed to move the first connecting device in a direction pointing away from the screen shafts and towards the base plate.

[0006] The object of the invention is also achieved by a method for dismantling a carrier plate of a classifying screen equipped with scrapers according to claim 1, in that a mounting element is positively and / or force-fit connected to the carrier plate to be dismantled, wherein the releasable connection of the first connecting device and the machine frame is released, so that the load of the carrier plate equipped with scrapers is borne by the second connecting device, wherein with the aid of the second connecting device the carrier plate together with the mounting element positively and / or force-fit attached to it is moved in the direction of the base plate until the mounting element rests on the base plate, and wherein the positively and / or force-fit connection between the carrier plate and the mounting element is released and the carrier plate is pulled laterally out of the machine frame transversely to the longitudinal direction of the machine frame.

[0007] Advantageous and appropriate embodiments and further developments of the invention result from the respective dependent claims.

[0008] The invention provides a classifying screen and a method that enable the operator to perform replacement and adjustment in such a way that neither installations in the chutes nor assembly or maintenance in a difficult-to-access work area below the classifying screen are necessary. According to the invention, a support plate for mounting the scrapers and a connection system comprising the first and second connection devices are provided for adjusting the scrapers and fixing the support plate and scraper unit to the machine frame. The support plate is removed laterally from the machine frame and can therefore be removed outside the danger zone, allowing the support plate to be fitted with new scrapers, for example, thus eliminating the need for scaffolding or platforms below the classifying screen in the chute.After the support plate is inserted into the interior of the machine frame, which is done using additional mounting elements that can be attached to the machine frame, the support plate must be installed in the connection system. This allows the machine operator or plant operator to, for example, adjust the height of the wipers. The mounting elements can be, for example, rail-shaped, but this is not mandatory.

[0009] In this embodiment of the classifying grid, the invention provides that the first connecting device comprises a pair of fastening devices, each fastening device being detachably attached to one of two longitudinal ends of the support plate and comprising a fastening surface that can be attached to a contact surface of the machine frame and a receiving surface that can be detachably connected to at least one of the support plates. When the support plate is installed on the classifying grid, the fastening surface of each fastening device rests against a corresponding contact surface of the machine frame, the fastening surface and the corresponding contact surface being detachably fastened to one another, for example, by means of a screw connection. The detachable connection for the first connecting device is thus advantageously designed.

[0010] In a further embodiment of the classifying grid, it is advantageous for connecting each fastening device to an associated longitudinal end of the corresponding support plate if each longitudinal end of the support plate is designed with a support pin which can be inserted and fixed into a through-opening formed in the receiving surface of each fastening device.

[0011] To further enhance the aforementioned connection between the fastening device and the support plate, the invention provides, in a embodiment of the classifying grid, that the receiving surface of each fastening device has a receiving recess into which a respective longitudinal end of the support plate can be inserted.

[0012] To facilitate the assembly and disassembly of a support plate from the classifying grid, the invention provides in a further embodiment of the classifying grid that each support plate has an elongated connecting recess into which a connecting projection of a mounting element, designed to be complementary to the connecting recess, can be inserted, which is designed to allow lateral removal from the machine frame of a support plate to be removed or lateral insertion into the machine frame of a support plate to be assembled.

[0013] For cost-effective maintenance of the classifying screen, a further embodiment of the invention provides that the support plate has a mounting surface in which a mounting hole is formed for each of the scrapers. A fastening element extends through this hole from the side facing away from the mounting surface and presses the corresponding scraper firmly onto the mounting surface. In this way, it is not necessary to replace the entire support plate. Rather, this measure makes it possible to replace only individual scrapers that are damaged.

[0014] In order to enable the carrier plate to be replaced or repaired to be lowered in a controlled manner to the base plate during disassembly, or to enable the carrier plate to be installed to be raised from the base plate to the installation height during assembly, the invention, in an embodiment of the classifying grid, provides that the second connecting device has a pair of height adjustment devices which are attached to opposite sides of the machine frame.

[0015] A structurally advantageous possibility is that each height adjustment device is designed as a threaded spindle, wherein each threaded spindle extends through a through-hole formed in the mounting surface of a respective fastening device and supports the respective fastening device after the detachable connection is released. The threaded spindle can comprise an end bearing and a threaded nut, wherein each threaded spindle extends through a through-hole formed in the mounting surface of the respective fastening device, the end bearing is supported on the machine frame, and the threaded nut supports the respective fastening device after the detachable connection is released.

[0016] Alternatively, the classification grate could also be designed with a height adjustment device consisting of a hydraulic cylinder, a scissor mechanism, or a locking pin. Additionally, a manual height adjustment device is also conceivable.

[0017] In one embodiment of the inventive method, the second connecting device is attached to the machine frame before the detachable connection is released. This allows the second connecting device to be attached to the machine frame only temporarily, rather than permanently. Furthermore, this has the advantage that instead of a multitude of second connecting devices corresponding to the number of support plates, only one second connecting device is required for the entire classifying screen. Likewise, the second connecting device can be stored safely and securely away from the classifying screen during operation, thus preventing it from being exposed to any contamination generated by the operation of the classifying screen.

[0018] In a further embodiment of the method, it is advantageous when replacing a support plate if the first connecting device is detached from the support plate to be removed before it is pulled laterally out of the machine frame. This allows for vertically extending recesses in the machine frame, in cases where two support plates are held by the first connecting device, to keep the two support plates apart. This prevents a collision between damaged and damaged support plates.

[0019] Finally, in a further embodiment of the method, the invention provides that the mounting element resting on the base plate is attached to the machine frame or to the base plate. This measure increases workplace safety and prevents the mounting element from being pulled out along with the support plate being removed, or from assuming an orientation unfavorable for assembly.

[0020] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the present invention. The scope of the invention is defined solely by the claims.

[0021] Further details, features and advantages of the subject matter of the invention will become apparent from the following description in conjunction with the drawing, in which an exemplary and preferred embodiment of the invention is shown.

[0022] The drawing shows: Figure 1 is a perspective view of a classifying screen according to the invention; Figure 2 is a perspective sectional view of the classifying screen according to the invention; Figure 3 is a perspective detail view of screen shafts provided with discs and of scrapers arranged below the screen shafts of the classifying screen according to the invention; Figure 4 is a perspective detail view of a machine frame and a first connecting device of the classifying screen according to the invention; Figure 5 is a perspective view of two support plates of the classifying screen according to the invention, on which the scrapers are attached and which are held by the first connecting device; Figure 6 is a perspective detail view of the support plates and first connecting device from Figure 5; Figure 7 is a perspective view of a fastening device of the first connecting device of the classifying screen according to the invention.Figure 8 shows a view of the carrier plate with scrapers attached to it of the classifying screen according to the invention; Figure 9 shows a perspective sectional view of the carrier plate with a scraper attached to it; Figure 10 shows a perspective sectional view of the carrier plate; Figure 11 shows a perspective view of a mounting element of the classifying screen according to the invention; Figure 12 shows an enlarged perspective view of the mounting element of the classifying screen according to the invention; Figure 13 shows a perspective view of the classifying screen according to the invention, omitting the representation of drives; Figure 14 shows a perspective view of the classifying screen according to the invention, omitting the representation of drives and side parts of the machine frame; Figure 15 shows a detailed view of the machine frame and the mounting element of the classifying screen according to the invention when the mounting element is connected to the carrier plate; Figure 16 shows a detailed view of the machine frame.of the support plate and the mounting element of the classifying screen according to the invention, after the mounting element is connected to the support plate, Figure 17 shows a detailed view of the machine frame, the support plate and the mounting element of the classifying screen according to the invention when the support plate is moved towards the base plate with the aid of a second connecting device, and Figure 18 shows a detailed view of the machine frame, the support plate and the mounting element of the classifying screen according to the invention when the support plate is pulled laterally out of the machine frame.

[0023] Figure 1 shows a perspective view of a classifying screen 1 according to the invention, which in the illustrated embodiment comprises a machine frame 2, which stands on a base plate 3, and a plurality of screen shafts 4. The screen shafts 4 are rotatably mounted one behind the other in a longitudinal direction 5 of the machine frame 2, with each screen shaft 4 being assigned a drive 6 which rotates the respective screen shaft 4. The screen shafts 4 are mounted in respective bearing housings, the bearing housings being mounted on the machine frame 2, so that the screen shafts 4 are supported on the machine frame 2 via the bearing housings. Furthermore, the drives 6 are alternately mounted on opposite sides of the machine frame 2.Figure 2 shows a perspective sectional view of the classifying screen 1 transverse to the longitudinal direction 5 of the machine frame 2, from which it can be seen that each screen shaft 4 is assigned a support plate 7, which is equipped with scrapers 8. Several discs 9, more precisely triple-arc discs 9, are formed on each screen shaft 4 and are arranged at intervals from one another, with the distance between adjacent discs 9 defining a gap 10. Each support plate 7 is arranged below its assigned screen shaft 4, i.e., each support plate 7 is arranged vertically offset from the corresponding screen shaft 4. The scrapers 8 extend into the gaps 10 formed by adjacent discs 9, as can be seen, for example, in Figure 3, which shows a perspective detail view of the screen shafts 4 equipped with discs 9 and of the scrapers 8 arranged below the screen shafts 4.Instead of a configuration of the sieve shafts 4 with three-arc discs 9, as shown in the exemplary embodiment in the figures, it is also conceivable that the invention can be applied to sieve shafts 4 with star arms or fingers. The sieve shafts 4 can be fitted with cast segments which have the disc contour of attached or welded-on discs 9, whereby the discs can also have recesses instead of the three-arc contour.

[0024] The support plates 7 are not directly attached to the machine frame 2. According to the invention, the support plates 7 are attached to the machine frame 2 via a first connecting device 11. The first connecting device 11 is connected to the machine frame 2 via a detachable connection 12 (see, for example, Figure 4) and supports at least one of the support plates 7. In this embodiment, the detachable connection 12 is designed as a screw connection, although other detachable connections are also conceivable. As can be seen in the embodiment shown in the figures, the first connecting device 11 supports two support plates 7. The first connecting device 11 has a pair of fastening devices 14, as shown in Figure 5. Each fastening device 14 is detachably attached to one of two longitudinal ends 15 of the support plate 7, as shown, for example, in Figures 5 and 6.Each fastening device 14 comprises a mounting surface 16 and a receiving surface 17, as shown, for example, in Figure 7. The fastening device 14 is angled, with the mounting surface 16 extending substantially perpendicular to the receiving surface 17. When the support plate 7 is installed on the machine frame 2, the mounting surface 16 rests against a contact surface 18 of the machine frame 2, as can be seen, among other things, in Figure 4. The mounting surface 16 of each fastening device 14 is detachably attached to the machine frame 2, for example, by means of a screw connection. The receiving surface 17 of the fastening device 14 extends away from the contact surface 18 and is designed to hold at least one support plate 7. With reference to the embodiment shown in the figures, two support plates 7 are detachably connected to the receiving surface 17.For this purpose, each longitudinal end 15 of each support plate 7 is formed with a support pin 19, as shown in Figure 8. In the assembled state of the support plate 7, such a support pin 19 is inserted into a through-opening 20 (see Figure 7) on the first connecting device 11. This through-opening is formed in the receiving surface 17 of a respective fastening device 14. In the illustrated embodiment, the support pin 19 has a thread so that the free end of the support pin 19 can be detachably connected to the receiving surface 17 by means of a nut, as shown in Figure 6. The through-opening 20 extends towards the contact surface 18, so that the support pin 19 is movably held in the vertical direction.Vertical adjustment of each support plate 7, and thus of the wipers 8 attached to the support plate 7, can be achieved by means of an adjusting screw 28, which can be screwed vertically into the through-hole 20 (see, for example, Figure 4). Depending on the screw-in depth of the adjusting screw 28, the vertical distance of the wipers 8 to the associated sieve shaft 4 can be individually adjusted by adjusting the support plate 7. In the illustrated embodiment, the receiving surface 17 of each fastening device 14 additionally has two receiving recesses 21, the number of receiving recesses 21 corresponding to the number of support plates 7 that are attached to the fastening device 14 or that are fixed by the first connecting device 11. Each longitudinal end 15 of the support plate 7 is inserted into the associated receiving recess 21.

[0025] Furthermore, Figures 9 and 10 show sectional views of the support plate 7. The support plate 7 has a mounting surface 22, which is inclined. The wipers 8 rest on the mounting surface 22 of the support plate 7 and are detachably connected to the support plate 7 by a screw connection, thus enabling easy replacement of a damaged or worn wiper 8. For this purpose, several mounting holes 23 are formed in the mounting surface 22 of the support plate 7, the number of mounting holes corresponding at least to the number of wipers 8 attached to the support plate 7. A fastening element 24, which in the illustrated embodiment is a screw, extends through each mounting hole 23 from the side facing away from the mounting surface 22, with the head of the screw bearing against the hole on the side of the support plate 7 facing away from the wiper 8.With the aid of the fastening element 24, each wiper 8 is pressed or clamped onto the mounting surface 22. Alternatively, instead of the fastening element 24, the wipers 8 can also be fastened by means of a clamp or a clamping mechanism. Each wiper 8 can consist of a single material or of several materials. Furthermore, each wiper 8 can consist of several components. Examples include a wiper 8 as a single component made of a wear-resistant material, a wiper 8 consisting of a base plate with welded-on wear-resistant components made of composite materials, or a wiper 8 consisting of a base plate with bonded, welded, or screwed-on carbide components.

[0026] As can also be seen in Figures 9 and 10, each support plate 7 has an elongated connecting recess 25. The connecting recess 25 is T-shaped and serves for a positive-locking connection with a rail-shaped mounting element 26, which is shown in Figures 11 and 12. The mounting element 26 has several connecting projections 27 that protrude from the mounting element 26. The connecting projections 27 have a cross-sectional shape complementary to the connecting recess 25, so that the rail-shaped mounting element 26 with the connecting projections 27 can be inserted laterally into the connecting recess 25 of a support plate 7, whereby the connecting recess 25 and the connecting projections 27 form a positive-locking connection 36 (see, for example, Figure 17).The purpose of the mounting element 26 is to prevent the support plate 7 from being placed directly onto the base plate 3 during disassembly. Instead, the mounting element 26 rests on the base plate 3 during disassembly and assembly of a support plate 7, allowing the support plate 7 to be replaced to be pulled laterally out of the machine frame 2 or the support plate 7 to be installed to be pushed laterally into the machine frame 2. Consequently, the connecting projection 27 of the mounting element 26, which is designed to be complementary to the connecting recess 25, can be inserted into the connecting recess 25 of the support plate 7. This allows a support plate 7 to be pulled laterally out of the machine frame 2 or a support plate 7 to be installed to be pushed laterally into the machine frame 2. Alternatively, instead of multiple connecting projections 27, the mounting element 26 can also have only one continuous connecting projection 27.It is understood that before inserting the mounting element 26, the adjusting screw 28 and the fastening device 14 must first be removed.

[0027] To lower the support plate 7 from its installation position shown in Figure 16 during replacement, or to raise the support plate 7 from a maintenance position shown in Figure 17 (lowered compared to the installation position) back into its installation position during installation, a second connecting device 29 is provided according to the invention. This second connecting device is attached to the machine frame 2. It is not necessary for the second connecting device 29 to be permanently attached to the machine frame 2. It is also conceivable that the second connecting device 29 is only attached to the machine frame 2 temporarily when a support plate 7 needs to be replaced or when the wipers 8 of a support plate 7 need to be renewed or replaced. The second connecting device 29 is visible in Figures 16 and 17 and supports the first connecting device 11 when the releasable connection 12 (see Figure 4) is released.when the screw connection is loosened and thus the mounting surface 16 of the corresponding fastening device 14 is no longer screwed to the contact surface 18 of the machine frame 2. Furthermore, the second connecting device 29 is designed such that it moves the first connecting device 11 in a direction 30 pointing away from the sieve shafts 4 (see arrow 30 in Figure 16) and in a direction pointing towards the base plate 3. Figures 13 and 14 are intended to illustrate the arrangement of the second connecting device 29 on the machine frame 2, whereby a representation of the drives 6 has been omitted in Figure 13 and a representation of parts of the machine frame 2 has also been omitted in Figure 14.As can be seen from Figures 13 and 14, the second connecting device 29 has a pair of height adjustment devices 31, which, in the illustrated embodiment, are supported on the machine frame 2 and are attached to opposite sides of the machine frame 2. Alternatively, instead of a supporting arrangement, the height adjustment devices 31 can also be screwed onto the machine frame 2 without being supported by it. Each height adjustment device 31 can, for example, be designed as a hydraulic cylinder. In the illustrated embodiment, however, each height adjustment device 31 is designed as a threaded spindle 32.Each threaded spindle 32 additionally comprises at least one end bearing 33 and a threaded nut 34, wherein the end bearing 33 is supported on the machine frame 2 and the threaded spindle 32 extends through a through hole 35 formed in the mounting surface 16 of a respective fastening device 14, as can be seen, for example, from the combined view of Figures 7 and 16. After the detachable connection 12 between a respective first connecting device 11 and the machine frame 2 is released, the second connecting device 29 supports the first connecting device 11.More precisely, the height adjustment device 31 carries an associated fastening device 14 after the fastening device 14 has been detached from the machine frame 2, wherein the corresponding threaded spindle 32 extends through the through hole 35 formed in the fastening surface 16 of the associated fastening device 14, the end bearing 33 is supported on the machine frame 2 and the threaded nut 34 carries the associated fastening device 14.

[0028] The following describes, with reference to Figures 15 to 18, a method for dismantling a support plate 7 of the classifying grid 1 equipped with scrapers 8. It is evident that the assembly of a support plate 7 to be installed is carried out in the reverse order of dismantling. At the beginning of the method, the assembly element 26 is positively and / or force-fittedly connected to the support plate 7 to be removed. With reference to Figure 15, it can be seen that two assembly elements 26 are inserted laterally into the machine frame 2, each assembly element 26 being assigned to one of two support plates 7, which are fixed by the first connecting device 11 and held parallel to each other.In this process step, two support plates 7, which are fixed at their longitudinal ends 15 by respective fastening devices 14, are each equipped with a mounting element 26 by inserting the respective mounting element 26 with its connecting projections 27 into the connecting recess 25 of the associated support plate 7, thereby forming a positive-locking connection 36 between the respective mounting element 26 and the associated support plate 7. The insertion of the mounting elements 26 is shown in Figure 15, where the mounting elements 26 are not yet fully inserted.

[0029] This is only the case in Figure 16, because here the mounting elements 26 with their connecting projections 27 are fully inserted into the connecting recesses 25 of the support plates 7. Subsequently, the detachable connection 12 between the first connecting device 11 and the machine frame 2 is released, i.e., the fastening devices 14 on each side of the machine frame 2 are unscrewed from the machine frame 2. By unscrewing or loosening the screw connections, the load of the two support plates 7 equipped with wipers 8 is borne by the second connecting device 29, i.e., that after the screw connections are loosened, the two support plates 7 are supported by the two height adjustment devices 31. The second connecting device 29 with the two height adjustment devices 31 can be permanently attached to the machine frame 2.Alternatively, an intermediate process step is also conceivable in which the second connecting device 29 is attached to the machine frame before the detachable connection 12 is released.

[0030] In a subsequent process step, the support plate 7, together with the mounting element 26 positively attached to it, is moved towards the base plate 3 with the aid of the second connecting device 29, as shown in Figure 17. In Figure 17, the two support plates 7, at whose two longitudinal ends 15 the fastening devices 14 are attached and which are connected to the mounting elements 26, are arranged in a lowered position, with the mounting elements 26 resting on the base plate 3. Alternatively, it is conceivable that the mounting elements 26 could rest on a suitably designed receiving console instead of on the base plate 3. The second connecting device 29 with its height adjustment devices 31 consequently lowers the support plates 7, to which the mounting elements 26 are positively attached, until the mounting elements 26 rest on the base plate 3.

[0031] If the mounting elements 26 rest on the base plate 3, in an optional process step the mounting elements 26 resting on the base plate 3 can be attached to the machine frame 2 or to the base plate 3 so that in the further process steps the mounting elements 26 retain their position for a later assembly of the support plates 7 and do not have to be realigned.

[0032] In a further optional process step, once the mounting elements 26 are resting on the base plate 3, the first connecting device 11 can be detached from the support plates 7 to be removed. This detachment step can be carried out before the support plates 7 are pulled laterally out of the machine frame 2.

[0033] The process step of releasing the positive-locking connections 36 between the support plates 7 and the mounting elements 26 is then mandatory, and the support plates 7 are pulled laterally out of the machine frame 2 transversely to the longitudinal direction 5 of the machine frame 2. In the embodiment shown in the figures, the positive-locking connections 36 are released by pulling the support plates 7 out laterally. However, alternative possibilities for a releasable and, if necessary, positive-locking connection between the mounting element 26 and the support plate 7 are also conceivable, which may require a separate release step before the lateral removal.After the support plates 7 have been pulled laterally out of the machine frame 2, either the scrapers 8 can be replaced or repaired, or a new support plate 7 with new scrapers 8 can be used and reattached to the machine frame 2 of the classifying grate 1, with assembly then taking place in the reverse order of disassembly.

[0034] In summary, the invention provides a classifying grate 1 and a method that enable the operator to replace and adjust the scrapers 8 in such a way that neither installations in the chutes nor assembly or maintenance in a difficult-to-access work area below the classifying grate 1 are required. According to the invention, a support plate 7 for mounting the scrapers 8 and a connection system comprising the first connection device 11 and the second connection device 29 are provided for adjusting the scrapers 8 and for fixing the unit consisting of the support plate 7 and scrapers 8 to the machine frame 2.The support plate 7 is removed laterally from the machine frame 2 and thus outside the danger zone, allowing the support plate 7 to be fitted with new scrapers 8, for example. This eliminates the need for scaffolding or platforms below the classifying grate 1 in the chute. After inserting the support plate 7 into the interior of the machine frame 2, which is accomplished using additional mounting elements 26 that are attached to the machine frame 2 and are designed as rails, the support plate 7 must be installed in the connection system. This system allows the machine operator or plant operator to adjust the height of the scrapers 8. A fine adjustment mechanism for precise positioning is integrated. Depending on the design, the height adjustment can be achieved via an electrically driven or manually operated threaded spindle 32 (trapezoidal or ball) or by using a hydraulic cylinder.Fine adjustment is carried out using adjusting screws 28 for each support plate 7 separately.

[0035] According to the invention, the first connecting device 11, with its pair of fastening devices 14, serves to receive the support plates 7 with the scrapers 8 attached thereto, wherein the first connecting device 11 enables the temporary fastening of the second connecting device 29 with the height adjustment devices 31. The first connecting device 11, in the form of the pair of fastening devices 14, is attached to the machine frame 2 and thus contributes to the rigidity of the machine frame 2 of the classifying screen 1. In addition, the fastening devices 14 of the first connecting device 11 enable fine adjustment of the support plates 7 and thus of the scrapers 8. The support plates 7 themselves provide a mounting surface 22 for the scrapers 8, wherein the fastening holes 23 of the scrapers are arranged in a protected manner on the side of the support plate 7 facing away from the mounting surface 22 in order to ensure a free fall of material.Additionally, the support plates 7 serve to accommodate the mounting elements 26 and provide a contact surface for the precise alignment of the scrapers 8. When mounted on the classifying grid 1, the support plates 7 also serve to provide lateral stiffening to the machine frame 2. The rail-shaped mounting element 26 allows for precise guidance of the support plates 7 during assembly and disassembly. The mounting element 26 also serves as a safety component in case the second connecting device 29 fails or is improperly installed. During disassembly, the mounting element 26 rests against the base plate 3 of the machine frame 2. When the support plates 7 do not require maintenance and the classifying grid 1 is in operation, the mounting element can be stored safely and protected from contamination outside the classifying grid 1.

[0036] The invention described above is, of course, not limited to the embodiment described and illustrated. It is evident that numerous modifications, obvious to a person skilled in the art according to the intended application, can be made to the embodiment shown in the drawing without departing from the scope of the invention. It is evident, for example, that the first connecting device can fix only one or more support plates 7, so that the disassembly method according to the invention consequently relates to one or more support plates 7. The invention includes everything contained in the description and / or illustrated in the drawing, including anything that is obvious to a person skilled in the art in contrast to the specific embodiment.

Claims

1. Classifying screen (1) with a machine frame (2) standing on a base plate (3) and a plurality of screen shafts (4) provided with discs (9) or star arms, which are rotatably mounted one behind the other in a longitudinal direction (5) of the machine frame (2) on the machine frame (2), wherein each screen shaft (4) is assigned a support plate (7) which is arranged vertically offset to the corresponding screen shaft (4) and which is equipped with scrapers (8) which extend into spaces (10) formed by adjacent discs (9) or star arms of the assigned screen shaft (4), characterized in that a first connecting device (11) is connected to the machine frame (2) via a detachable connection (12) and supports at least one of the support plates (7), wherein a second connecting device (29) is attached to the machine frame (2),which, after the release of the detachable connection (12), carries the first connecting device (11) and which is designed to move the first connecting device (11) in a direction (30) pointing away from the sieve shafts (4) and towards the base plate (3).

2. Classifying grate (1) according to claim 1, characterized in that the first connecting device (11) has a pair of fastening devices (14), wherein each fastening device (14) is detachably attached to one of two longitudinal ends (15) of the support plate (7) and comprises a fastening surface (16) which can be attached to a contact surface (18) of the machine frame (2) and a receiving surface (17) which can be detachably connected to at least one of the support plates (7).

3. Classifying grid (1) according to claim 2, characterized in that a respective longitudinal end (15) of the support plate (7) is formed with a support pin (19) which can be inserted into a through opening (20) formed in the receiving surface (17) of a respective fastening device (14) and fixed in place.

4. Classifying grid (1) according to claim 2 or 3, characterized in that the receiving surface (17) of a respective fastening device (14) has a receiving recess (21) into which a respective longitudinal end (15) of the support plate (7) can be inserted.

5. Classifying grid (1) according to one of the preceding claims, characterized in that a respective support plate (7) has an elongated connecting recess (25) into which a connecting projection (27) of a mounting element (26) can be inserted, the connecting projection being designed to enable the lateral removal from the machine frame (2) of a support plate (7) to be removed or the lateral insertion into the machine frame (2) of a support plate (7) to be mounted.

6. Classifying grid (1) according to one of the preceding claims, characterized in that the support plate (7) has a mounting surface (22) in which a fastening bore (23) is formed for each of the scrapers (8), through which a fastening element (24) extends from the side facing away from the mounting surface (22) and presses the corresponding scraper (8) onto the mounting surface (22).

7. Classifying rack (1) according to one of claims 2 to 6, characterized in that the second connecting device (29) has a pair of height adjustment devices (31) which are attached to opposite sides of the machine frame (2).

8. Classifying grate (1) according to claim 7, characterized in that a respective height adjustment device (31) is designed as a threaded spindle (32), wherein a respective threaded spindle (32) extends through a through hole (35) formed in the mounting surface (16) of a respective fastening device (14), and wherein a respective threaded spindle (32) supports a respective fastening device (14) after the releasable connection (12) has been released.

9. Classifying grate (1) according to claim 7, characterized in that a respective height adjustment device (31) is designed as a hydraulic cylinder.

10. Method for dismantling a support plate (7) equipped with scrapers (8) of a classifying grate (1) according to claim 1, wherein a mounting element (26) is connected to the support plate (7) to be dismantled in a form-fitting and / or force-fitting manner, wherein the detachable connection (12) of first connecting device (11) and machine frame (2) is detached is so that the load of the support plate (7) equipped with wipers (8) is borne by the second connecting device (29), wherein, with the aid of the second connecting device (29), the carrier plate (7) together with the mounting element (26) attached to it in a form-fitting and / or force-fitting manner is moved in the direction of the base plate (3) until the mounting element (26) rests on the base plate (3), and wherein the positive locking and / or force locking connection (36) between the support plate (7) and the mounting element (26) is released and the support plate (7) is pulled laterally out of the machine frame (2) transversely to the longitudinal direction (5) of the machine frame (2).

11. Method according to claim 10, wherein the second connecting device (29) is attached to the machine frame (2) before the detachable connection (12) is released.

12. Method according to claim 10, wherein the first connecting device (11) is detached from the support plate (7) to be removed before the support plate (7) is pulled out laterally from the machine frame (2).

13. Method according to claim 12, wherein the mounting element (26) resting on the base plate (3) is attached to the machine frame (2) or to the base plate (3).