EP3636355B1 - Sieve and method for disassembling a carry sheet of a sieve fitted with strippers - Google Patents

Description

The invention relates to a classifying grate with a machine frame standing on a base plate and a large number of screen shafts provided with disks or star arms, which are rotatably mounted one behind the other in a longitudinal direction of the machine frame, with each screen shaft being assigned a support plate which is vertical offset from the corresponding screen shaft and which is equipped with scrapers which extend into spaces formed by adjacent disks or star fingers of the associated screen shaft, according to claim 1.

Furthermore, the invention relates to a method for dismantling a carrier plate, equipped with scrapers, of a classifying grate, according to claim 10.

A classification grate of the type described above is also referred to as a roller grate and is, for example, from DE 644 501 famous. Such known roller grates are used for transporting and classifying heaps of rock. The roller grate is usually integrated into a system concept, which consists of a feeding element, a further processing element, such as a crusher and transfer chutes. Depending on the task, several screen shafts are mounted on the machine frame. The screen shafts are driven either individually or collectively via a chain and rotate in the conveying direction. Due to the shape of the shaft assembly, such as disks designed as three-arched disks, star arms or fingers, and due to the rotation, the loose rock debris is conveyed in the longitudinal direction of the machine frame. Between the discs or star arms, material that is smaller than the gap between screen shafts and discs or Star-poor, failing which results in a classification of the material. Below these screen shafts, scrapers are mounted which, as is known, consist of a wear-resistant material and, thanks to their shape and arrangement, clean the screen shafts of adhering feed material. The wipers can be replaced or adjusted when wear increases and the wiping effect decreases as a result. In order to make the adjustment, platforms or scaffolding must be erected below the classifying grate in the area of the passage chute for the screened material. This usually requires extensive preparations, such as cleaning the machine. Once these preparations have been made, the wiper fastening screws must be loosened when readjusting the wipers or removed when replacing the wipers. This work is very expensive due to the very limited work space and the ability to see into the work area.

From the DE 196 06 499 A1 discloses a classifying grate with a plurality of rotating, meshing separating disks, according to the preamble of claim 1.

The cutting discs are assigned scrapers to prevent sticking, with each scraper being a strip of metal perpendicular to the plane of the cutting disc with little lateral play, which is resiliently clamped in a holder outside the disc periphery at an acute angle relative to a radial of the disc and is with the free end supported approximately tangentially on the shaft carrying the disk.

Also from the US 8,360,249 B1 a classifying grate is known, in which case scrapers are mounted on a machine frame so that they can be removed.

The invention has for its object to provide a solution that provides an improved classifying grate in a structurally simple manner, which is characterized by a simple Readjustment or a simple exchange of wipers.

In the case of a classifying grate of the type described at the beginning, the object is achieved according to the invention in that a first connecting device is connected to the machine frame via a detachable connection and carries at least one of the support plates, with a second connecting device being attached to the machine frame, which, after loosening the detachable connection carries the first connecting device and which is designed to move the first connecting device in a direction away from the screen shafts and towards the base plate pointing direction.

The object is also achieved according to the invention by a method for dismantling a carrier plate equipped with scrapers of a classification grate according to claim 1, in that an assembly element is positively and/or non-positively connected to the carrier plate to be dismantled, the detachable connection of the first connecting device and machine frame being released so that the load of the carrier plate equipped with wipers is borne by the second connecting device, with the carrier plate together with the mounting element fastened to it in a form-fitting and/or force-fitting manner being moved in the direction of the base plate with the aid of the second connecting device until the mounting element rests on the base plate, and the positive and/or non-positive connection between the carrier plate and the mounting element is released and the carrier plate is pulled out of the machine frame laterally transversely to the longitudinal direction of the machine frame.

Advantageous and expedient refinements and developments of the invention result from the respective dependent claims.

The invention provides a classifying grate and a method which the operator can use enable the replacement and adjustment to be carried out in such a way that neither installations in the chutes nor assembly or maintenance have to take place in a work area below the classification grate that is difficult to access. According to the invention, a carrier plate for mounting the scrapers and a connection system, which comprises the first connecting device and the second connecting device, are provided in order to adjust the scrapers and to fix the unit made up of carrier plate and scraper on the machine frame. The carrier plate is dismantled from the side of the machine frame and can therefore be removed from the danger area, so that the carrier plate can be fitted with new scrapers, for example, which makes it unnecessary to set up a scaffolding or platforms below the classification grate in the chute. After the carrier plate has been inserted into the interior of the machine frame, which is done using additional mounting elements that can be attached to the machine frame, the carrier plate must be installed in the connection system, which enables the machine operator or the system operator to adjust the height of the scrapers, for example. The mounting elements can, for example, be in the form of rails, but do not have to be.

In the design of the classifying grate, the invention provides that the first connecting device has a pair of fastening devices, with a respective fastening device being detachably fastened to one of two longitudinal ends of the carrier plate and a fastening surface which can be fastened in contact with a contact surface of the machine frame, and a receiving surface , which can be detachably connected to at least one of the support plates. In the installed state of the carrier plate on the classifying grate, the fastening surface of each fastening device lies against a corresponding contact surface of the machine frame, the fastening surface and the corresponding contact surface for Example are releasably attached to each other by means of a screw connection. The detachable connection for the first connection device is formed in this advantageous manner.

In order to connect each fastening device to an associated longitudinal end of the corresponding carrier plate, it is advantageous in a further embodiment of the classification grate if a respective longitudinal end of the carrier plate is formed with a supporting pin, which can be inserted into a through-opening formed in the receiving surface of a respective fastening device and can be fixed.

To further increase the above connection between the fastening device and the carrier plate, the invention in the design of the classification grate provides that the receiving surface of a respective fastening device has a receiving recess into which a respective longitudinal end of the carrier plate can be inserted.

In order to facilitate the assembly and disassembly of a carrier plate from the classification grate, the invention provides in a further embodiment of the classification grate that a respective carrier plate has an elongate connecting recess into which a connecting attachment of a mounting element can be inserted, which is designed to be complementary to the connecting recess. which is designed to enable a carrier plate to be dismantled to be pulled out of the machine frame from the side or to be pushed in from the side into the machine frame of a carrier plate to be assembled.

For cost-effective maintenance of the classifying grate, a further embodiment of the invention provides that the carrier plate has a mounting surface in which a fastening bore is formed for each of the scrapers, through which a fastening element extends from the side facing away from the mounting surface and mounts the corresponding scraper attached to the mounting surface. To this way, the entire carrier plate does not need to be replaced. Rather, this measure makes it possible to replace only individual wipers that are damaged.

So that the carrier plate to be replaced or repaired can be lowered to the base plate in a controlled manner during disassembly or so that the carrier plate to be installed can be raised from the base plate to the installation height during assembly, the invention provides in the design of the classification grate that the second connecting device a pair of height adjustment devices mounted on opposite sides of the machine frame.

A structurally advantageous possibility is that each height adjustment device is designed as a threaded spindle, with each threaded spindle extending through a through hole formed in the fastening surface of a respective fastening device and carrying a respective fastening device after the detachable connection has been released. The threaded spindle can include an end bearing and a threaded nut, with a respective threaded spindle then extending through a through hole formed in the fastening surface of a respective fastening device, the end bearing being supported on the machine frame and the threaded nut carrying a respective fastening device after the detachable connection has been released .

As an alternative to this, it is also conceivable in the design of the classifying grate if a respective height adjustment device is designed as a hydraulic cylinder, a scissor element or a locking bolt. In addition, it is conceivable that the height adjustment device is a manual height adjustment.

In an embodiment of the method according to the invention, it is provided that the second connecting device is fastened to the machine frame before the detachable connection is released will. This makes it possible for the second connecting device to be attached to the machine frame only temporarily and not permanently. In addition, this has the advantage that it is not possible to provide a large number of second connecting devices corresponding to the number of carrier plates, but only one second connecting device for the entire classification grate. Likewise, the second connection device can be stored safely and protected away from the classification grate while the classification grate is in operation, so that the second connection device is not exposed to any contamination caused by the operation of the classification grate.

In a further embodiment of the method, it is advantageous when exchanging a carrier plate if the first connecting device is detached from the carrier plate to be dismantled before the carrier plate is pulled out laterally from the machine frame. In the event that two carrier plates are held by the first connecting device, vertically running recesses can be provided in the machine frame, through which the two carrier plates are kept at a distance, so that if one of the two carrier plates is damaged, the damaged carrier plate can collide with the other support plate is avoided.

Finally, in a further embodiment of the method, the invention provides that the assembly element resting on the base plate is fastened to the machine frame or to the base plate. This measure increases safety at work and prevents the assembly element from being pulled out with the carrier plate to be dismantled or from assuming an unfavorable orientation for the assembly.

It goes without saying that the features mentioned above and those that are still to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without the leave the scope of the present invention. The scope of the invention is defined only by the claims.

Further details, features and advantages of the subject of the invention result from the following description in connection with the drawing, in which an exemplary and preferred embodiment of the invention is shown.

• Figur 1 eine perspektivische Ansicht auf einen Klassierrost gemäß der Erfindung,
• Figur 2 eine perspektivische Schnittansicht auf den erfindungsgemäßen Klassierrost,
• Figur 3 eine perspektivische Detailansicht auf mit Scheiben versehenen Siebwellen und auf unterhalb der Siebwellen angeordneten Abstreifern des erfindungsgemäßen Klassierrostes,
• Figur 4 eine perspektivische Detaildarstellung eines Maschinenrahmens und einer ersten Verbindungsvorrichtung des erfindungsgemäßen Klassierrostes,
• Figur 5 eine perspektivische Ansicht auf zwei Trägerbleche des erfindungsgemäßen Klassierrostes, an denen die Abstreifer angebracht sind und die von der ersten Verbindungsvorrichtung gehaltenen werden,
• Figur 6 eine perspektivische Detailansicht der Trägerbleche und ersten Verbindungsvorrichtung aus Figur 5,
• Figur 7 eine Perspektivansicht auf eine Befestigungseinrichtung der ersten Verbindungsvorrichtung des erfindungsgemäßen Klassierrostes,
• Figur 8 eine auf das Trägerblech mit daran befestigten Abstreifern des erfindungsgemäßen Klassierrostes,
• Figur 9 eine perspektivische Schnittansicht des Trägerblechs mit daran angebrachtem Abstreifer,
• Figur 10 eine perspektivische Schnittansicht des Trägerblechs,
• Figur 11 eine Perspektivdarstellung eines Montage-Elements des erfindungsgemäßen Klassierrostes,
• Figur 12 eine vergrößerte Perspektivdarstellung des Montage-Elements des erfindungsgemäßen Klassierrostes,
• Figur 13 eine perspektivische Ansicht auf den Klassierrost gemäß der Erfindung unter Auslassung der Darstellung von Antrieben,
• Figur 14 eine perspektivische Ansicht auf den Klassierrost gemäß der Erfindung unter Auslassung der Darstellung von Antrieben und Seitenteilen des Maschinenrahmens,
• Figur 15 eine Detaildarstellung des Maschinenrahmens und des Montage-Elements des erfindungsgemäßen Klassierrostes, wenn das Montage-Element mit dem Trägerblech verbunden wird,
• Figur 16 eine Detaildarstellung des Maschinenrahmens, des Trägerblechs und des Montage-Elements des erfindungsgemäßen Klassierrostes, nachdem das Montage-Element mit dem Trägerblech verbunden wird,
• Figur 17 eine Detaildarstellung des Maschinenrahmens, des Trägerblechs und des Montage-Elements des erfindungsgemäßen Klassierrostes, wenn das Trägerblech mit Hilfe einer zweiten Verbindungsvorrichtung in Richtung des Grundblechs bewegt wird, und
• Figur 18 eine Detaildarstellung des Maschinenrahmens, des Trägerblechs und des Montage-Elements des erfindungsgemäßen Klassierrostes, wenn das Trägerblech seitlich aus dem Maschinenrahmen herausgezogen wird.

In the drawing shows:

• figure 1 a perspective view of a classification grate according to the invention,
• figure 2 a perspective sectional view of the classification grate according to the invention,
• figure 3 a detailed perspective view of screen shafts provided with discs and strippers arranged below the screen shafts of the classification grate according to the invention,
• figure 4 a perspective detailed view of a machine frame and a first connecting device of the classification grate according to the invention,
• figure 5 a perspective view of two carrier plates of the classification grate according to the invention, to which the scrapers are attached and which are held by the first connecting device,
• figure 6 a perspective detailed view of the carrier plates and the first connecting device figure 5 ,
• figure 7 a perspective view of a fastening device of the first connecting device of the classification grate according to the invention,
• figure 8 one on the support plate with wipers attached to it of the classification grate according to the invention,
• figure 9 a perspective sectional view of the support plate with attached wiper,
• figure 10 a perspective sectional view of the support plate,
• figure 11 a perspective view of an assembly element of the classification grate according to the invention,
• figure 12 an enlarged perspective view of the assembly element of the classification grate according to the invention,
• figure 13 a perspective view of the classification grate according to the invention, omitting the representation of drives,
• figure 14 a perspective view of the classification grate according to the invention, omitting the representation of drives and side parts of the machine frame,
• figure 15 a detailed view of the machine frame and the mounting element of the classification grate according to the invention when the mounting element is connected to the carrier plate,
• figure 16 a detailed view of the machine frame, the support plate and the mounting element of the classification grate according to the invention after the mounting element is connected to the support plate,
• figure 17 a detailed representation of the machine frame, the carrier plate and the mounting element of the classification grate according to the invention when the carrier plate is moved in the direction of the base plate with the aid of a second connecting device, and
• figure 18 a detailed view of the machine frame, the carrier plate and the mounting element of the classification grate according to the invention when the carrier plate is pulled out of the machine frame sideways.

In figure 1 a perspective view of a classification grate 1 according to the invention is shown, which in the exemplary embodiment shown comprises a machine frame 2 which stands on a base plate 3 and a multiplicity of screening shafts 4 . The screen shafts 4 are rotatably mounted one behind the other in a longitudinal direction 5 of the machine frame 2 on the machine frame 2, with each screen shaft 4 being assigned a drive 6 which drives the respective screen shaft 4 in rotation. The screen shafts 4 are mounted in respective bearing housings, the bearing housing on the Machine frame 2 are mounted, so that the screen shafts 4 are mounted on the bearing housing on the machine frame 2. Furthermore, the drives 6 are mounted alternately on opposite sides of the machine frame 2 . the figure 2 shows a perspective sectional view of the classification grate 1 transversely to the longitudinal direction 5 of the machine frame 2, from which it can be seen that each screening shaft 4 is assigned a carrier plate 7, which is equipped with strippers 8. A plurality of discs 9, more precisely three-arch discs 9, are formed on each screen shaft 4 and are arranged at a distance from one another, with the distance between adjacent discs 9 defining an intermediate space 10. A respective carrier plate 7 is arranged below the associated screen shaft 4 , ie a respective carrier plate 7 is arranged offset vertically to the corresponding screen shaft 4 . The scrapers 8 extend into the gaps 10 formed by adjacent discs 9, as is the case, for example figure 3 can be seen, which shows a perspective detailed view of the screen shafts 4 provided with discs 9 and the strippers 8 arranged below the screen shafts 4 . Instead of designing the screen shafts 4 with three-arch discs 9, as shown in the exemplary embodiment in the figures, it is also conceivable that the invention can be applied to screen shafts 4 with star arms or fingers. The screen shafts 4 can be fitted with cast segments which have the disc contour of discs 9 that are plugged on or welded on, it being possible for the discs to have recesses instead of the three-arch contour.

The carrier plates 7 are not attached directly to the machine frame 2 . According to the invention, it is provided that the support plates 7 are fastened to the machine frame 2 via a first connecting device 11 . The first connecting device 11 is connected via a detachable connection 12 (see, for example figure 4 ) connected to the machine frame 2 and carries at least one of the support plates 7. The detachable connection 12 is designed as a screw connection in the exemplary embodiment, although other detachable connections are also conceivable. As can be seen from the exemplary embodiment shown in the figures, the first connecting device 11 carries two support plates 7. The first connecting device 11 has a pair of fastening devices 14, as is shown in FIG figure 5 you can see. A respective fastening device 14 is releasably attached to one of two longitudinal ends 15 of the carrier plate 7, such as the figures 5 and 6 demonstrate. In this case, a respective fastening device 14 comprises a fastening surface 16 and a receiving surface 17, as is the case, for example figure 7 indicates. The fastening device 14 is angled, with the fastening surface 16 extending essentially perpendicularly to the receiving surface 17 . In the installed state of the support plate 7 on the machine frame 2, the fastening surface 16 is in contact with a contact surface 18 of the machine frame 2, as shown, among other things figure 4 is evident. The fastening surface 16 of a respective fastening device 14 is detachably fastened to the machine frame 2, for example via 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 exemplary embodiment shown in the figures, two support plates 7 are detachably connected to the receiving surface 17 . For this purpose, a respective longitudinal end 15 of each support plate 7 is designed with a support pin 19, as shown in figure 8 is shown. Such a support pin 19 is in the mounted state of the support plate 7 on the first connecting device 11 in a through hole 20 (see figure 7 ) inserted, which is formed in the receiving surface 17 of a respective fastening device 14. In the exemplary embodiment shown, the trunnion 19 has a thread so that the free end of the trunnion 19 can be connected to the receiving surface 17 by means of a nut can be releasably connected, as shown in figure 6 is shown. The through-opening 20 extends in the direction of the contact surface 18, so that the supporting pin 19 is movably accommodated in the vertical direction. A vertical adjustment of each carrier plate 7 and thus of the wipers 8 fastened to the carrier plate 7 can be brought about 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 screwing depth of the adjusting screw 28, the vertical distance of the scrapers 8 from the associated screen shaft 4 can be set individually by adjusting the support plate 7. In the exemplary embodiment shown, the receiving surface 17 of each fastening device 14 also has two receiving recesses 21, the number of receiving recesses 21 corresponding to the number of support plates 7 which are attached to the fastening device 14 or which are fixed by the first connecting device 11. A respective longitudinal end 15 of the support plate 7 is arranged pushed into the associated receiving recess 21 .

Furthermore, in the Figures 9 and 10 Sectional views of the support plate 7 are shown. The carrier plate 7 has a mounting surface 22 which is designed to run obliquely. The wipers 8 rest on the mounting surface 22 of the support plate 7 and are detachably connected to the support plate 7 via a screw connection, as a result of which a damaged or worn wiper 8 can be easily replaced. For this purpose, a plurality of fastening bores 23 are formed in the mounting surface 22 of the carrier plate 7, the number of fastening bores corresponding at least to the number of wipers 8 fastened to the carrier plate 7. Through a respective mounting hole 23 extends from the side facing away from the mounting surface 22, a fastener 24, which is a screw in the embodiment shown, wherein the head of the screw at the hole on the Stripper 8 opposite side of the support plate 7 is supported. With the aid of the fastening element 24 , a respective wiper 8 is pressed or fastened to the mounting surface 22 . As an alternative to the fastening element 24, it is also conceivable that the wipers 8 can be fastened with the aid of clamping or clamping. A respective wiper 8 can consist of a single material or of several materials. Furthermore, a respective wiper 8 can consist of several components. Examples include wipers 8 as a component made of a wear-resistant material, wipers 8 made of a base plate with wear protection components that are welded on and made of composite materials, or wipers 8 made of a base plate with hard metal components that are glued on, welded on, or screwed on.

Like the Figures 9 and 10 but it can also be seen that each support plate 7 has an elongate connecting recess 25 embodied therein. The connecting recess 25 is T-shaped and is used for positive connection with a rail-shaped mounting element 26, which consists of the Figures 11 and 12 is evident. The mounting member 26 has a plurality of connecting lugs 27 protruding from the mounting member 26 . The connecting lugs 27 have a cross-sectional shape complementary to the connecting recess 25, so that the rail-shaped mounting element 26 with the connecting lugs 27 can be pushed laterally into the connecting recess 25 of a carrier plate 7, with the connecting recess 25 and the connecting lugs 27 forming a positive connection 36 (see for example figure 17 ) train. The mounting element 26 serves the purpose that the support plate 7 is not set down directly on the base plate 3 during disassembly. Rather, the mounting element 26 rests on the base plate 3 during the disassembly and assembly of a carrier plate 7, so that the carrier plate 7 to be replaced pulled out of the side of the machine frame 2 or the support plate 7 to be installed can be pushed into the side of the machine frame 2 . Consequently, the connecting shoulder 27 of the assembly element 26, which is designed to be complementary to the connecting recess 25, can be pushed into the connecting recess 25 of the support plate 7, so that a support plate 7 to be removed can be pulled out of the machine frame 2 from the side or pushed into the machine frame 2 from the side to be mounted support plate 7 is possible. As an alternative to the multiple connection lugs 27, only one continuous connection lug 27 can also be formed on the mounting element 26. It goes without saying that before the assembly element 26 is pushed in, the adjusting screw 28 and the fastening device 14 must first be removed.

In order to remove the support plate 7 from its in figure 16 shown installation position or to lower the support plate 7 from an in figure 17 shown and lowered compared to the installation position back into the installation position, a second connecting device 29 is provided according to the invention, which is attached to the machine frame 2, it being necessary for the second connecting device 29 to be permanently attached to the machine frame 2 is. It is also conceivable that the second connecting device 29 is only then, and thus temporarily, attached to the machine frame 2 when a carrier plate 7 is to be exchanged or when the wipers 8 of a carrier plate 7 are to be renewed or exchanged. The second connecting device 29 is from figures 16 and 17 visible and carries the first connecting device 11 when the detachable connection 12 (see figure 4 ) is loosened, ie when the screw connection is loosened and thus the fastening surface 16 of the corresponding fastening device 14 is no longer screwed to the contact surface 18 of the machine frame 2 . Moreover, the second connecting device 29 is such designed so that they move the first connecting device 11 in a direction 30 pointing away from the screen shafts 4 (see arrow 30 in figure 16 ) and moved in a direction pointing to the base plate 3 . The representations of Figures 13 and 14 are intended to clarify the arrangement of the second connecting device 29 on the machine frame 2, with Figure 13 to a representation of the drives 6 and in figure 14 in addition, parts of the machine frame 2 are not shown. How from the Figures 13 and 14 As can be seen, the second connecting device 29 has a pair of height adjustment devices 31 which, in the exemplary embodiment shown, are supported on the machine frame 2 and which are fastened on opposite sides of the machine frame 2 . As an alternative to a supporting arrangement, the height adjustment devices 31 can also be screwed into the machine frame 2 without being supported on the machine frame 2 . A respective height adjustment device 31 can be designed, for example, as a hydraulic cylinder. In the exemplary embodiment shown, however, a respective height adjustment device 31 is designed as a threaded spindle 32 . Each threaded spindle 32 additionally comprises at least one end bearing 33 and one threaded nut 34, with the end bearing 33 being supported on the machine frame 2 and the threaded spindle 32 extending through a through hole 35 formed in the fastening surface 16 of a respective fastening device 14, as is shown, for example, in FIG the synopsis of figures 7 and 16 is evident. After releasing the releasable connection 12 between a respective first connecting device 11 and the machine frame 2, the second connecting device 29 carries the first connecting device 11. More specifically, the height adjustment device 31 carries an associated Fastening device 14 after the fastening device 14 is detached from the machine frame 2, the corresponding threaded spindle 32 extending through the through hole 35 formed in the fastening surface 16 of the associated fastening device 14, the end bearing 33 being supported on the machine frame 2 and the threaded nut 34 the associated fastening device 14 carries.

In the following, with reference to the Figures 15 to 18 a method for dismantling a carrier plate 7 equipped with strippers 8 of the classification grate 1 is described, it being clear that the assembly of a carrier plate 7 to be assembled takes place in the reverse order of disassembly. At the beginning of the method, the assembly element 26 is positively and/or non-positively connected to the support plate 7 to be dismantled. Regarding figure 15 it can be seen that two mounting elements 26 are pushed laterally into the machine frame 2, each mounting element 26 being assigned to one of two support plates 7 which are fixed by the first connecting device 11 and are held parallel to one another. In this method step, two carrier plates 7, which are fixed at their longitudinal ends 15 by respective fastening devices 14, are each equipped with a mounting element 26, in that the respective mounting element 26 is pushed with its connecting lugs 27 into the connecting recess 25 of the associated carrier plate 7 is, whereby the form-fitting connection 36 is formed between the respective mounting element 26 and the associated support plate 7. The insertion of the assembly elements 26 is in figure 15 shown, the mounting elements 26 are not fully inserted here.

This is only in figure 16 the case, because here the mounting elements 26 with their connecting lugs 27 are complete inserted into the connecting recesses 25 of the support plates 7. The detachable connection 12 of the first connecting device 11 and the machine frame 2 is then released, ie the fastening devices 14 are unscrewed from the machine frame 2 on each side of the machine frame 2 . By unscrewing or loosening the screw connections, the load of the two support plates 7 equipped with wipers 8 is carried by the second connecting device 29 , ie after loosening the screw connections two support plates 7 are carried 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 method step is also conceivable, in which the second connecting device 29 is attached to the machine frame before the detachable connection 12 is released.

In a subsequent process step, the support plate 7 together with the mounting element 26 fastened to it in a form-fitting manner is then moved in the direction of the base plate 3 with the aid of the second connecting device 29, which in figure 17 is shown. In figure 17 the two support plates 7, on whose two longitudinal ends 15 the fastening devices 14 are attached and which are connected to the mounting elements 26, are arranged lowered, with the mounting elements 26 resting on the base plate 3. Alternatively, it is conceivable that the mounting elements 26 can rest on a correspondingly set up mounting bracket 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 fastened in a form-fitting manner, until the mounting elements 26 rest on the base plate 3.

If the assembly elements 26 rest on the base plate 3, in an optional step on the Base plate 3 overlying assembly elements 26 are attached to the machine frame 2 or to the base plate 3, so that in the further process steps the assembly elements 26 maintain their position for later assembly of the support plates 7 and do not have to be realigned.

In a further optional method step, when the assembly elements 26 rest on the base plate 3 and the first connecting device 11 can be detached from the carrier plates 7 to be dismantled. This step of releasing can take place before the support plates 7 are pulled out of the machine frame 2 laterally.

The method step in which the form-fitting connections 36 between the support plates 7 and the assembly elements 26 are released and the support plates 7 are pulled out of the machine frame 2 laterally transversely to the longitudinal direction 5 of the machine frame 2 is then again mandatory. In the exemplary embodiment shown in the figures, the form-fitting connections 36 are released by laterally pulling out the support plates 7, although alternative options for the detachable and possibly form-fitting connection of the mounting element 26 and the support plate 7 are also conceivable May require solving as a separate process step. After the carrier plates 7 have been pulled laterally out of the machine frame 2, either the scrapers 8 can be replaced or repaired, or a new carrier plate 7 with new scrapers 8 can be used and attached again to the machine frame 2 of the classification grate 1, with the assembly then done in reverse order of disassembly.

In summary, the invention provides a classifying grate 1 and a method that enable the operator to exchange and adjust the scrapers 8 in such a way that neither installations in the chutes nor assembly or maintenance are in a difficult-to-access area Working area must take place below the classification grid 1. According to the invention, a carrier plate 7 for mounting the scrapers 8 and a connection system, which includes the first connecting device 11 and the second connecting device 29, are provided in order to adjust the scrapers 8 and to fix the unit of carrier plate 7 and scraper 8 to the machine frame 2. The carrier plate 7 is dismantled from the side of the machine frame 2 and thus outside the danger area, so that the carrier plate 7 can be equipped with new scrapers 8, for example, which makes the erection of a scaffolding or platforms below the classification grate 1 in the chute superfluous. After the carrier plate 7 has been inserted into the interior of the machine frame 2, which is done by means of rail-shaped mounting elements 26 that are to be additionally attached and fastened to the machine frame 2, the carrier plate 7 must be installed in the connection system. This enables the machine operator or the plant operator to adjust the height of the scrapers 8 . A fine adjustment for an exact setting is integrated. Depending on the design, the height can be adjusted via an electrically driven or manually used threaded spindle 32 (trapezoid or ball) or by using a hydraulic cylinder. Fine adjustment is carried out separately for each support plate 7 by means of adjusting screws 28 .

According to the invention, the first connecting device 11 with its pair of fastening devices 14 serves to accommodate the carrier plates 7 with the wipers 8 attached thereto, the first connecting device 11 enabling a 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 fastened to the machine frame 2 and thus contributes to the rigidity of the machine frame 2 of the classification grate 1. In addition, the fastening devices 14 of the first connecting device 11 enable fine adjustment of the carrier plates 7 and thus the wipers 8. The carrier plates 7 themselves provide a mounting surface 22 for the wipers 8, with the fastening bores 23 of the wipers being protected on the side of the carrier plate facing away from the mounting surface 22 7 are arranged to ensure free fall of material. In addition, the support plates 7 are used to accommodate the assembly elements 26 and provide a contact surface for the exact alignment of the scrapers 8, the support plates 7 being used in the assembled state on the classifying grate 1 for transverse reinforcement of the machine frame 2. The rail-shaped mounting element 26 allows the carrier plates 7 to be guided precisely during assembly and disassembly of the carrier plate 7. The mounting element 26 also serves as a safety component if the second connecting device 29 fails or is installed improperly. During disassembly, the assembly element 26 is supported on the base plate 3 of the machine frame 2, with the assembly element being able to be stored safely and protected from dirt outside of the classifying grate 1 if no maintenance is required on the support plates 7 and the classifying grate 1 is in operation.

The invention includes everything that is presented in the claims.

Claims (13)

1. A classifying grate (1) with a machine frame (2) standing on a base plate (3) and a multiplicity of screen shafts (4) provided with discs (9) or star arms, which screen shafts are mounted rotatably on the machine frame (2) lying one behind another in a longitudinal direction (5) of the machine frame (2), wherein each screen shaft (4) has a support plate (7) assigned to it, which is arranged vertically offset to the corresponding screen shaft (4) and which is equipped with scrapers (8), which extend into gaps (10) formed by adjacent discs (9) or by star arms of the assigned screen shaft (4),
   characterised in that
   a first connecting device (11) is connected to the machine frame (2) via a detachable connection (12) and carries at least one of the support plates (7), wherein a second connecting device (29) is fastened to the machine frame (2), which carries the first connecting device (11) after the release of the detachable connection (12) and which is designed to move the first connecting device (11) in a direction (30) pointing away from the screen shaft (4) and pointing towards the base plate (3).
2. The classifying grate (1) according to claim 1, characterised in that the first connecting device (11) comprises a pair of fastening devices (14), wherein a respective fastening device (14) is detachably fastened to one of two longitudinal ends (15) of the support plate (7) and comprises an attachment surface (16), which can be attached in an abutting manner on a bearing 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. The classifying grate (1) according to claim 2, characterised in that a respective longitudinal end (15) of the support plate (7) is constituting with a support pin (19), which can be fixed plugged into a through-opening (20) formed in the receiving surface (17) of a respective fastening device (14).
4. The classifying grate (1) according to claim 2 or 3, characterised in that the receiving surface (17) of a respective fastening device (14) comprises a receiving recess (21), into which a respective longitudinal end (15) of the support plate (7) can be inserted.
5. The classifying grate (1) according to any one of the preceding claims, characterised in that a respective support plate (7) comprises an elongated connecting recess (25), into which a connecting extension (27) of an assembly element (26) formed complementary to the connecting recess (25) can be inserted, which can be constituted so as to enable a support plate (7) to be dismantled to be pulled out laterally from the machine frame (2) or a support plate (7) to be assembled to be inserted laterally into the machine frame (2).
6. The classifying grate (1) according to any one of the preceding claims, characterised in that the support plate (7) comprises a mounting surface (22), in which a fastening bore (23) is constituted for each of the scrapers (8), through which a fastening element (24) extends from the side facing away from the mounting surface (22) and fastens the corresponding scraper (8) pressed onto the mounting surface (22).
7. The classifying grate (1) according to any one of claims 2 to 6, characterised in that the second connecting device (29) comprises a pair of height adjustment devices (31) which are fastened on opposite sides of the machine frame (2).
8. The classifying grate (1) according to claim 7, characterised a respective height adjustment device (31) is designed as a threaded spindle (32), wherein a respective threaded spindle (32) extends through a respective through-hole (35) formed in the attachment surface (16) of a respective fastening device (14), and wherein a respective threaded spindle (32) carries a respective fastening device (14) after the detachable connection (12) has been released.
9. The classifying grate (1) according to claim 7, characterised a respective height adjustment device (31) is designed as a hydraulic cylinder.
10. A method for dismantling a support plate (7) equipped with scrapers (8) of a classifying grate (1) according to claim 1,

    wherein an assembly element (26) is positively and/or non-positively connected to the support plate (7) to be dismantled,

    wherein the detachable connection (12) of first connecting device (11) and machine frame (2) is released, so that the load of the support plate (7) equipped with scrapers (8) is borne by the second connecting device (29),

    wherein, with the aid of the second connecting device (29), the support plate (7) together with the assembly element (26) fastened thereon in a positive and/or non-positive manner is moved in the direction of the base plate (3), until the assembly element (26) rests on the base plate (3), and

    wherein the positive and/or non-positive connection (36) between the support plate (7) and the assembly element (26) is released and the support plate (7) is pulled out laterally from the machine frame (2) at right angles to the longitudinal direction (5) of the machine frame (2).
11. The method according to claim 10, wherein the second connecting device (29) is fastened to the machine frame (2) before the detachable connection (12) is released.
12. The method according to claim 10, wherein, before the support plate (7) is pulled out laterally from the machine frame (2), the first connecting device (11) is detached from the support plate (7) to be dismantled.
13. The method according to claim 12, wherein the assembly element (26) resting on the base plate (3) is fastened to the machine frame (2) or to the base plate (3).

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