WO2024157162A1

WO2024157162A1 - Roller grate system and method for adjusting gap distances of a roller grate system

Info

Publication number: WO2024157162A1
Application number: PCT/IB2024/050614
Authority: WO
Inventors: Kathrin Brink; Tobias Koch; Alexander Schnitker
Original assignee: FLSmidth AS
Current assignee: FLSmidth AS
Priority date: 2023-01-23
Filing date: 2024-01-23
Publication date: 2024-08-02
Anticipated expiration: 2025-07-23

Abstract

The invention relates to a roller grate system (10) for screening and/or conveying bulk material, having a frame (11) extending in a longitudinal direction (v) and a plurality of segment shafts (12) arranged in the frame (11) for conveying the bulk material, each of which are rotatably mounted by at least two bearing blocks (13) and are spaced apart from one another transversely to their longitudinal axes (a) in such a way that a gap (s) is formed between two of the segment shafts (12). The roller grate system has at least one adjusting device (14) for variable gap adjustment.

Description

Roller grate system and method for adjusting gap distances of a roller grate system

Description

The invention relates to a roller grate system and a method for adjusting gap distances of a roller grate system. A roller grate system according to the preamble of patent claim 1 is known, for example, from EP 2 511 014 Al.

Roller grate systems are generally used for screening and cleaning coarse, contaminated materials in mining. The roller grate systems are used as screening machines that have a plurality of driven screening shafts with transport or conveyor disks. The transport disks are often designed with a special, for example polygonal, outer contour or are mounted eccentrically. This means that the materials to be screened are gently set into a rolling motion during operation. For example, clay or earthy components that adhere to the coarse material are loosened and screened out. The roller grate systems are particularly suitable for classifying coarse, moist, sticky or clay-containing materials.

The roller grate systems can be used, for example, in coaling plants for prescreening, to relieve the load on crushers and for classification after crusher comminution. In order to carry out different screenings, roller grate systems are often designed to be adjustable.

For example, from EP 2 511 014 Al mentioned at the beginning, a roller grate system with a plurality of screening shafts is known, between which a gap width can be variably adjusted. The screening shafts each have an eccentric disk at one longitudinal end, which are mechanically coupled to one another via a rod. The rod is connected to a hydraulic cylinder, through which the rod can be moved and the eccentric disks can therefore be rotated. The gaps between the screening shafts can be adjusted by operating the hydraulic cylinder.

The roller grate system according to EP 2 511 014 Al includes a complex structural design due to the hydraulic adjustment device, which is maintenance and costintensive. The invention is therefore based on the object of specifying a roller grate system in which maintenance effort and costs are reduced due to a simplified structural design. Furthermore, the invention is based on the object of specifying a method for adjusting the gap distances of a roller grate system.

According to the invention, the above-mentioned object with regard to roller grate systems is achieved by the subject matter of claim 1. With regard to the method, the above-mentioned object is achieved by the subject matter of claim 11.

Specifically, the object is achieved by a roller grate system for screening and/or conveying bulk material with a frame extending in a longitudinal direction and a plurality of segment shafts arranged in the frame for conveying the bulk material, each of which is rotatably mounted by at least two bearing blocks and transverse to their longitudinal axes are spaced apart from each other in such a way that a gap is formed between two of the segment shafts. According to the invention, the roller grate system has at least one adjusting device for variable gap adjustment, which comprises at least one guide element running in the longitudinal direction, on which one of the two bearing blocks of the segment shafts is displacably guided. In addition, the adjusting device has at least one first fixing element for each segment shaft, which fixes the bearing block in at least one longitudinal position of the guide element, in particular releasably.

The invention has the great advantage that the adjusting device, due to its simplified structural design, enables variable gap adjustment or variable gap adjustment between adjacent segment shafts quickly and easily. The individual segment shafts can be displaced along the frame through the guide on the longitudinal guide element via the bearing blocks. In other words, one of the bearing blocks of the respective segment shafts is arranged on the longitudinal guide element in such a way that the segment shafts can be displaced along the guide element. It is only through the first fixing element that one bearing block of the respective segment shaft can be fixed or is fixed to the guide element in such a way that the fixation can be released. In the roller grate system according to the invention, the object of fixing the individual segment shafts at a specific longitudinal position of the guide element and the object of displacing the segment shafts to adjust the gap are separated. The roller grate system therefore has a simplified structural design due to the separation of functions, which on the one hand makes it easier to handle the gap adjustment and, on the other hand, has a reduced maintenance effort than the hydraulic adjustment systems known from the prior art. This reduces the operating costs of the roller grate system according to the invention.

A further advantage of the invention is that each of the segment shafts is independently displacable along the guide element and can be fixed at a longitudinal position on the guide element. This means that different gap widths between the segment shafts can be easily achieved in the roller grate system. For example, a roller grate system with more than two segment shafts can be configured so that it comprises different gap widths. This increases the functionality and the variety of configurations of the roller grate system.

The frame of the roller grate system has a longitudinal extension, with the segment shafts being arranged one after the other in the frame. The adjacent segment shafts are spaced apart from each other in such a way that a gap with a specific gap width is formed between the segment shafts. The distance is preferably measured between the longitudinal axes of two adjacent segment shafts. The gap between two adjacent segment shafts is preferably delimited by at least one outer contour of the segment shafts transversely to their longitudinal axes. The outer contour can be part of one or more transport disks, in particular conveyor disks, and/or part of one or more spacer elements, in particular spacers. It is important that, depending on the requirements of the roller grate system, the gap width between the segment shafts can be selected so that a specific grain size of the material to be screened can be screened off.

The segment shafts are each rotatably mounted on the frame by two bearing blocks. The bearing blocks are the bearing points for the segment shafts on the frame. The segment shafts are preferably arranged in a common plane. The guide element preferably extends through a portion of the bearing blocks of the segment shafts. In order to fix the bearing blocks at different longitudinal positions, the first fixing element interacts with the guide element, preferably in a non-form-fitting and/or form-fitting manner, in particular in a rotationally fixed manner. To fix them, the bearing blocks are preferably clamped on the guide element by at least the first fixing element.

The roller grate system according to the invention is particularly preferably used for screening and/or conveying coarse, contaminated materials, for example in mining. The roller grate system is suitable for screening and/or classifying any type of rock material, earth material or the like. The use of roller grate systems is not limited to mining. Other areas of application are possible.

Preferred embodiments of the invention are set out in the dependent claims.

In a preferred embodiment, the adjusting device comprises at least a second fixing element, which is arranged opposite the first fixing element and fixes the bearing block by clamping. In other words, the bearing block of the associated segment shaft is arranged at least in sections between the first and second fixing elements. In their fixing position, the two fixing elements apply a clamping force to the bearing block in such a way that the bearing block is braced between the two fixing elements. Or to put it another way, the bearing block is clamped between the fixing elements in the fixing position. The bracing forces of the fixing elements preferably act in opposite directions. This embodiment has the advantage that the bearing block is braced at the desired longitudinal position of the guide element. Such a fixation is, on the one hand, fail-safe and, on the other hand, can be released easily and quickly if necessary using appropriate means, especially tools.

When fixing the bearing block, the fixing elements preferably rest on the bearing block. It is possible for at least one support piece to be arranged between the respective fixing element and the bearing block. The fixing elements can therefore also rest indirectly on the bearing block.

In a further preferred embodiment, the guide element has at least one threaded section, wherein the first fixing element and/or the second fixing element engages in the threaded section in order to fix the bearing block. The threaded section is preferably formed over the entire length of the guide element. Alternatively, it is possible for the threaded section to be formed in sections over the length of the guide element. It can, for example, be advantageous if a separate thread section is formed for each longitudinal position of the segment shafts. Preferably, the first and/or the second fixing element is arranged in the threaded section on the guide element. It is advantageous if the first and/or the second fixing element are guided to and/or on the guide element. The advantage of this embodiment is that a firm and secure position fixation of one bearing block of the associated segment shaft can be achieved through the interaction of the threaded section of the guide element with one or both fixing elements. Preferably, the guide element is a threaded rod and/or the first fixing element is a first threaded nut and/or the second fixing element is a second threaded nut. In a preferred embodiment, the two threaded nuts are in threaded engagement with the threaded rod. It is advantageous here that the costs are low thanks to standardized components and an adjustment can be made quickly and easily. Furthermore, due to the very simple structural design, the gap adjustment is possible manually, i.e. by hand.

In order to move the respective bearing block and thus the segment shaft to adjust the gap, the threaded nuts are loosened from the bearing block in such a way that the bearing block with the segment shaft can be displaced along the threaded rod. The segment shaft is then displaced and positioned at a specific longitudinal position on the threaded rod. If the segment shaft is in the desired longitudinal position, the two threaded nuts are brought up to the bearing block and pressed onto the bearing block in such a way that they each exert a bracing force on the bearing block. In this fixing position, the bearing block is clamped between the two threaded nuts and is thus fixed to the threaded rod.

The bearing blocks preferably each comprise at least one guide section which is arranged between the first and second fixing elements, wherein the guide element extends through the guide section. The guide section can be a guide sleeve. In other words, the bearing blocks, which are displacably guided on the guide element, can have at least one guide sleeve through which the guide element extends. This has the advantage that the bearing blocks of the segment shafts can be easily displaced along the guide element. It is advantageous if the guide section has at least one contact surface for each fixing element, which faces the fixing element. As a result, the bracing force of the respective fixing element can be optimally introduced into the guide section, which results in a firm bracing and thus secure position fixation of the bearing block.

Preferably, at least one of the segment shafts has at least one end stop which limits a displacement path of the segment shaft. In other words, at least one of the segment shafts includes at least one displacement path limiting element. Particularly preferably, that segment shaft which only has one adjacent segment shaft comprises the end stop. It is possible for each of the segment shafts to include an end stop to limit the displacement path. The advantage here is that the segment shafts cannot be displaced beyond an undesirable longitudinal position due to the end stop. This makes it easier to handle the segment shafts when adjusting the gap width.

Further preferably, at least one of the segment shafts has at least one distance element, in particular a spacer, which limits a displacement path to at least one adjacent segment shaft. The distance element is preferably arranged on at least one of the two bearing blocks of the segment shaft. The distance element preferably extends towards the adjacent segment shaft and is designed such that a gap is (always) formed upon contact with the adjacent segment shaft, in particular the bearing block of the adjacent segment shaft. This has the advantage that damage to the segment shafts is prevented. The distance element can define a minimum gap width of the gap between the two adjacent segment shafts, which in turn makes the gap adjustment easier.

It is particularly advantageous if the segment shafts each have at least one electric, in particular separate, drive which rotationally drives the respective segment shaft during operation. The segment shafts can therefore be operated independently of one another. This increases the functionality of the roller grate system.

The roller grate system can have an electric, in particular higher-level, drive for driving all segment shafts. Here the electric drive is coupled to the individual segment shafts by at least one power transmission means. The power transmission means can comprise at least one belt and/or at least one chain. In addition, the roller grate system can have at least one tensioning device which keeps the at least one power transmission means under tension, for example when adjusting the shaft distances or shaft positions. Driving the segment shafts with just a single electric drive reduces the costs, at least with regard to the drive components of the roller grate system.

The frame can have at least two first frame rails which are spaced apart from one another transversely to the longitudinal direction, wherein the segment shafts run between the frame rails. Preferably, the frame has at least one second frame rail for each first frame rail, which in the installed position runs above the first frame rail, wherein one of the bearing blocks of the respective segment shaft is arranged, in particular guided, between the first and second frame rails. This has the advantage that the segment shafts are stable in the frame. The frame is designed in such a way that it absorbs the forces that occur from the segment shafts during operation and thus relieves the load on the adjusting device. This increases, among other things, the service life of the roller grate system.

According to a secondary aspect, the invention relates to a method for adjusting gap distances of a roller grate system, in particular a roller grate system according to the invention, which has a frame extending in a longitudinal direction and a plurality of segment shafts arranged in the frame for conveying the bulk material, each of which is rotatably supported by at least two bearing blocks fixed at different positions in the longitudinal direction of the frame and spaced apart transversely to their longitudinal axes in such a way that a gap is formed between two adjacent segment shafts, wherein the roller grate system has at least one adjusting device for variable gap adjustment.

The method includes the following steps:

- Loosening a first and/or second fixing element, in particular a first and/or second threaded nut, of the adjusting device such that the bearing block of at least one of the segment shafts is displacable;

- Displacing the segment shaft in the longitudinal direction of the frame until a certain gap is set between the segment shaft and an adjacent segment shaft, wherein the bearing block is guided on a guide element running in the longitudinal direction, in particular a threaded rod.

With regard to the method, reference is made to the advantages explained in connection with the roller grate system. In addition, the method can alternatively or additionally have individual or a combination of a plurality of features mentioned above in relation to the roller grate system.

The invention is explained in more detail below with further details with reference to the accompanying drawings. The embodiments shown represent examples of how the roller grate system according to the invention can be designed.

In these

Figure 1 shows a side view of a roller grate system according to a preferred exemplary embodiment according to the invention, wherein a specific gap is set between two adjacent segment shafts;

Figure 2 shows a side view of the roller grate system according to Figure 1, in which the gap between the adjacent segment shafts is adjusted; and Figure 3 shows a top view of the roller grate system according to Figure 1.

In the following description, the same reference numerals are used for identical and equivalent parts.

Fig. 1 shows a roller grate system 10 used for screening and conveying coarse, contaminated materials in mining. The roller grate system 10, for example, removes clay or earthy components that adhere to the coarse material and carries out a screening off. The roller grate system 10 is particularly suitable for classifying coarse, moist, sticky or clay-containing materials. This includes in particular rocks in any shape and type. The use of the roller grate system 10 is not limited to mining. Other areas of application are possible. Below, the material to be screened and conveyed through the roller grate system 10 is generally referred to as bulk material.

The roller grate system 10 comprises, as can be clearly seen in Figures 1 to 3, a frame 11 and a plurality of segment shafts 12, which are arranged in the frame 11. The frame 11 has a longitudinal direction v. Specifically, the frame 11 includes two first frame rails 24, which are spaced apart from one another transversely to the longitudinal direction v. Furthermore, the frame 11 has two second frame rails 25. One of the two second frame rails 25 is assigned to one of the two first frame rails 24. The frame 11 therefore has a first longitudinal side 27 and a second longitudinal side 28, each of which comprises a pair of first and second frame rails 24, 25.

As shown in Figures 1 and 2, one of the two second frame rails 25 is arranged above one of the first frame rails 24 in the installed position. The second frame rails 25 are offset upwards from the first frame rails 24 and therefore delimit a free space 26 in the vertical direction. The first frame rails 24 preferably have a support profile, in particular a U-profile, I-profile, double-T profile or the like. These are designed to be correspondingly stable. The second frame rails 25 preferably have a closed profile, in particular a rectangular profile. The second frame rails 25 are designed, for example, as a profile tube. Other cross-sectional profiles of the first and second frame rails 24, 25 are possible.

As shown in Figures 1 to 3, the roller grate system 10 comprises a total of four segment shafts 12 for screening and conveying bulk material. The roller grate system 10 can alternatively have fewer than four, in particular at least two, segment shafts 12. Alternatively, the roller grate system 10 can have more than four segment shafts 12. The segment shafts 12 extend between the two long sides 27,

28 of the frame 11. The segment shafts 12 are each constructed in a segment construction. In other words, the segment shafts 12 are each constructed in a modular manner. Specifically, the segment shafts 12 are built shafts.

The segment shafts 12 each have a base shaft 29, a plurality of transport disks 31 and a plurality of spacer elements 32. The transport disks 31 and spacer elements 32 are segments of the segment shaft 12. As can be clearly seen in Figures 1 and 2, the transport disks 31 have a polygonal outer circumference 33. In other words, the transport disks 31 have an outer circumference 33 in a three-arch shape. The transport disks 31 are not limited to the design with a polygonal outer circumference 33. For example, one or more of the transport disks 31 can have an elliptical or star-shaped outer circumference. Rotationally symmetrical outer circumferences 33 are also possible. The spacer elements 32 are spacers which hold the transport disks 31 at a predetermined longitudinal axis position on the base shaft 29. The spacer elements 32 are sleeve-shaped. The base shaft 29 is designed as a hollow shaft, wherein the longitudinal ends 34 of which are each closed by a shaft journal 35.

The transport disks 31 and the spacer elements 32 are arranged on the base shaft

29 in a rotationally fixed manner. The base shaft 29 has a central longitudinal axis a, on which the transport disks 31 and the spacer elements 32 are arranged coaxially. The transport disks 31 and the spacer elements 32 are connected to the base shaft 29 in a form-fitting manner, in particular in a rotationally fixed manner. Additionally or alternatively, the transport disks 31 and/or the spacer elements 32 can be connected in a non-form-fitting manner to the base shaft 29, in particular at least partially.

Specifically, the transport disks 31 and the spacer elements 32 are pushed onto an outer circumference of the base shaft 29 in a form-fitting manner. For this purpose, the base shaft 29 has a plurality of grooves (not shown) running parallel to the central longitudinal axis a, which are formed on the outer circumference. Specifically, the base shaft 29 has three grooves which are formed in an outer circumference of the base shaft 29. Alternatively, the base shaft 29 may have fewer or more than three grooves formed in the outer circumference of the base shaft 29. In general, the base shaft 29 is not limited to the number of three grooves. The grooves are formed over the entire length of the outer circumference of the base shaft 29 parallel to the central longitudinal axis a and are evenly distributed in the circumferential direction.

It is possible that the spacer elements 32 are simply pushed onto the base shaft 29 without being connected to the base shaft 29 in a form-fitting manner.

The transport disks 31 and the spacer elements 32 have a radially inwardly extending web (not shown) for each groove of the base shaft 29, which engages in the groove. The transport disks 31 and the spacer elements 32 and the base shaft 29 are thus connected in a form-fitting manner to one another by a tongue and groove system. The transport disks 31 and the spacer elements 32 are releasably connected to the base shaft 29. The segment shaft 10 includes a bracing unit through which the transport disks 31 and the spacer elements 32 on the base shaft 11 are releasably braced together. The transport disks 31 and the spacer elements 32 can be braced on the base shaft 11 mechanically, electromechanically, hydraulically and/or pneumatically.

The roller grate system 10 also has two bearing blocks 13 for each segment shaft 12, which rotatably mounts the segment shaft 12 about its longitudinal axis a. One of the bearing blocks 13 is arranged at one of the two longitudinal ends 34. Specifically, the segment shaft 12 is connected to the bearing blocks 13 via the shaft journals 35. Bearing blocks 13 are generally understood to be the bearing points of the segment shaft 12, via which the segment shaft 12 is rotatably mounted on the frame 11. As shown in Figures 1 and 2, the bearing blocks 13 of the segment shafts 12 rest on the first frame rail 24. The first frame rail 24 can be part of the frame 11 itself or an additional construction applied to the frame 11.

The segment shafts 12 each have an electric, in particular separate, drive 23, which rotationally drives the respective segment shaft 12 during operation. The segment shafts 12 can therefore be operated independently of one another.

Alternatively, the roller grate system 10 can have an electric, in particular higher- level, drive for driving all segment shafts 12. Here the electric drive is coupled to the individual segment shafts 12 by at least one power transmission means. The power transmission means can comprise at least one belt and/or at least one chain. In addition, the roller grate system 10 can have at least one tensioning device which keeps the at least one power transmission means under tension, for example when adjusting the shaft distances or shaft positions. All segment shafts 12 can preferably be operated by the single electric drive.

As can be clearly seen in Figures 1 and 2, the roller grate system 10 has an adjusting device 14 for variable gap adjustment or gap adjustment between two adjacent segment shafts 12. The adjusting device 14 can be arranged on each longitudinal side 27, 28 of the frame 11. In other words, the roller grate system 10 can have two such adjusting devices 14. Alternatively, it is possible for the roller grate system 10 to have the adjusting device 14 (only) on one of the longitudinal sides 27, 28. For the sake of simplicity, the arrangement of the adjusting device 14 on the first longitudinal side 27 of the frame 11 is described below. This does not exclude the possibility that such an adjusting device 14 can also be arranged on the second longitudinal side 28 of the frame 11.

The adjusting device 14 comprises a guide element 15 running in the longitudinal direction v, on which a first 13' of the two bearing blocks 13 of each segment shaft 12 is displacably guided. These are, as can be seen as an example in Figures 1 and 2, arranged on the first longitudinal side 27 of the frame 11. In addition, the adjusting device 14 has a first fixing element 16 and a second fixing element 17 for each segment shaft 12. Specifically, the adjusting device 14 has a first fixing element 16 and a second fixing element 17 for each first bearing block 13' of the segment shafts 12. The first and second fixing elements 16, 17 are arranged on the guide element 15 and serve to release and fix the corresponding first bearing block 13' at a longitudinal position on the guide element 15.

The respective first bearing block 13' comprises a guide section 22 which is sleeveshaped. In other words, the first bearing blocks 13' each include a guide sleeve 22. The guide sleeve 22 of the first bearing blocks 13' is arranged between the two fixing elements 16, 17. The guide element 15 extends through the fixing elements 16, 17 and the guide sleeve 22 of the first bearing block 13'.

The longitudinal guide element 15 has a threaded section 18 into which the first and second fixing elements 16, 17 engage. Specifically, the guide section 15 is a threaded rod 19 which extends through the guide sleeves 22 of the first bearing blocks 13'. The first fixing element 16 is a first threaded nut 21 and the second fixing element 17 is a second threaded nut 21. The first and second threaded nuts 21 are arranged opposite one another in a fixing position on the respective guide sleeve 22. The guide sleeve 22 of the first bearing block 13' is braced or clamped between the two threaded nuts 21 and thus fixed. The first bearing blocks 13' are thus mechanically clamped on the threaded rod 19 via the threaded nuts 21.

In Figures 1 and 2 it can be seen that vertical threaded rods 36 are arranged on each longitudinal side 27, 28 of the frame 11 in the installed position, which extend between the first and second frame rails 24, 25. For example, the second frame rail 25 can be raised or lowered via the vertical threaded rods 36. It is possible to brace the bearing blocks 13 against the first, in particular lower, frame rail 24 and thus additionally fix them mechanically.

The segment shafts 12 of the roller grate system 10 are equipped with an end stop, not shown. Specifically, at least the segment shafts 12 lying on the outside in the longitudinal direction v have an end stop which limits a displacement path of the segment shafts 12. For this purpose, the first and/or the second frame rail 24, 25 can have a counter-stop which cooperates with the end stop to limit the displacement path. These two segment shafts 12 each have only one adjacent segment shaft 12. Alternatively, it is conceivable that each of the segment shafts 12 has a stop that limits its displacement path.

Furthermore, the segment shafts 12 each have a distance element (not shown), in particular a spacer, which limits a displacement path to at least one adjacent segment shaft 12. The distance element is preferably arranged on one of the two bearing blocks 13 of the segment shafts 12. The distance element extends towards the adjacent segment shaft 12 and is designed such that a gap s is formed upon contact with the adjacent segment shaft 12, in particular the bearing block 13 of the adjacent segment shaft 12.

The setting or adaptation of the gap widths between the segment shafts 12 is described below. The gap adjustment between two adjacent segment shafts 12 is explained as an example.

In order to adjust the gap width of a gap s between two adjacent segment shafts 12, the two threaded nuts 21 are released from the guide sleeve 22 of the bearing block 13' of one or both segment shafts 12 in such a way that the bearing block 13' with the segment shaft 12 can be displaced along the threaded rod 21. The released segment shaft 12 is then moved along the threaded rod 21 and positioned at a specific longitudinal position on the threaded rod 21. If the released segment shaft 12 is in the desired longitudinal position, the two threaded nuts 21 are brought to the guide sleeve 22 of the bearing block 13' and pressed onto the guide sleeve 22 in such a way that these threaded nuts 21 each exert a bracing force on the guide sleeve 22. The guide sleeve 22 is then clamped between the two threaded nuts 21 and thus fixed in position on the threaded rod.

Through this process, the gap width of the gap s between the two adjacent segment shafts 12 is adjusted. The bearing block 13' and thus the segment shaft 12 is in a fixing position in this state. It is possible to release and fix only one of the two segment shafts 12 in order to adjust the gap width of the gap s. It is also possible to release and fix both segment shafts 12 in order to adjust the gap width of the gap s. The gap adjustment process described above can also be transferred to the other adjacent segment shafts 12 of the roller grate system. In Figures 1 and 2, for example, the roller grate system 10 is shown with different gap widths of the gap s. In Figure 1, the gaps s between the adjacent segment shafts 12 are smaller than the gaps s in Figure 2. Further gap widths of the gap s between the adjacent segment shafts 12 are possible.

List of Reference Numerals

10 roller grate system

11 frame

12 segment shafts

13 bearing blocks

13' first bearing block

14 adjusting device

15 guide element

16 first fixing element

17 second fixing element

18 threaded section

19 threaded rod

21 threaded nut

22 guide section

23 electrical drive

24 first frame rail

25 second frame rail

26 free space

27 first longitudinal side

28 second longitudinal side

29 base shaft

31 plurality of transport disks

32 plurality of spacer elements

33 outer circumference of the transport disks

34 longitudinal ends of the segment shafts

35 shaft journals

36 vertical threaded rods v longitudinal direction a longitudinal axis of the segment shafts s gap

Claims

1. Roller grate system (10) for screening and/or conveying bulk material with a frame (11) extending in a longitudinal direction (v) and a plurality of segment shafts (12) arranged in the frame (11) for conveying the bulk material, each of which is rotatably mounted by at least two bearing blocks (13) and spaced apart transversely to their longitudinal axes (a) in such a way that a gap (s) is formed between two of the segment shafts (12), cha racteri zed in that at least one adjusting device (14) for variable gap adjustment, which comprises at least one guide element (15) running in the longitudinal direction (v), on which one of the two bearing blocks (13) of the segment shafts (12) is displacably guided, and the adjusting device (14) has at least one first fixing element (16) for each segment shaft (12), which fixes the bearing block (13) in at least one longitudinal position of the guide element (15), in particular releasably.

2. Roller grate system (10) according to claim 1, cha racteri zed in that the adjusting device (14) comprises at least a second fixing element (17) which is arranged opposite the first fixing element (16) and fixes the bearing block by clamping.

3. Roller grate system (10) according to claim 1 or 2, cha racterized in that the guide element (15) has at least one threaded section (18), wherein the first fixing element (16) and/or the second fixing element (17) engages in the threaded section (18), to fix the bearing block (13).

4. Roller grate system (10) according to any one of the preceding claims, in particular according to claim 2 or 3, cha racteri zed in that the guide element (15) is a threaded rod (19) and/or the first and/or the second fixing element (16, 17) is/are a threaded nut (21).

5. Roller grate system (10) according to any one of the preceding claims, cha racteri zed in that the bearing blocks (13) each comprise at least one guide section (22), in particular guide sleeves, which is arranged between the first and second fixing elements (17), wherein the guide element (15) extends through the guide section (22).

6. Roller grate system (10) according to any one of the preceding claims, cha racterized in that at least one of the segment shafts (12) has at least one end stop which limits a displacement path of the segment shaft (12).

7. Roller grate system (10) according to any one of the preceding claims, cha racterized in that at least one of the segment shafts (12) has at least one distance element, in particular a spacer, which limits a displacement path to at least one adjacent segment shaft (12).

8. Roller grate system (10) according to any one of the preceding claims, cha racteri zed in that the segment shafts (12) each have at least one electric drive (23) which rotationally drives the respective segment shaft (12) during operation.

9. Roller grate system (10) according to any one of the preceding claims, cha racteri zed in that the frame (11) has at least two first frame rails (24) which are spaced apart from one another transversely to the longitudinal direction (v), wherein the segment shafts (12) run between the first frame rails (24).

10. Roller grate system (10) according to claim 9, cha racteri zed in that the frame (11) has at least one second frame rail (25) for each first frame rail (24), which in the installed position runs above the first frame rail (24), wherein one of the bearing blocks (13) of the respective segment shaft (12) is arranged, in particular guided, between the first and second frame rails (24, 25).

11. Method for adjusting gap distances of a roller grate system (10), in particular according to any one of the preceding claims, which has a frame

(11) extending in a longitudinal direction (v) and a plurality of segment shafts (12) arranged in the frame (11) for conveying the bulk material, each of which is rotatably mounted by at least two bearing blocks (13) fixed at different positions in the longitudinal direction (v) of the frame (11) and spaced apart from one another transversely to their longitudinal axes (a) in such a way that a gap (s) is formed between two adjacent segment shafts

(12), wherein the roller grate system (10) has at least one adjusting device (14) for variable gap adjustment, wherein the method comprises the following steps:

- Releasing a first and/or second fixing element (16/17), in particular a first and/or second threaded nut (21), of the adjusting device (14) such that the bearing block (13) of at least one of the segment shafts (12) is displacable;

- Displacing the segment shaft (12) in the longitudinal direction (v) of the frame (11) until a certain gap (s) is set between the segment shaft (12) and an adjacent segment shaft (12), wherein the bearing block (13) is guided on a guide element (15) running in the longitudinal direction (v), in particular a threaded rod (19).