SPUR WHEEL SCRAPER

Abstract

The disclosure relates to a roller crusher including a first grinding roll and a second grinding roll, the first and second grinding rolls being arranged generally in parallel to each other and to define a crushing gap therebetween and drivable in a counter-rotating manner. The roller crusher includes a device of a first type for loosening granular material present on a crushing surface of at least one of the rolls, the device including at least one rotatable disc element. The subject further relates to a roller crusher, wherein the plurality of disc elements is individually rotatable.

Claims

1. A roller crusher comprising a first grinding roll and a second grinding roll, said first and second grinding rolls being arranged generally in parallel to each other and to define a crushing gap therebetween and drivable in a counter-rotating manner, wherein the roller crusher comprises a device of a first type for loosening granular material present on a crushing surface of at least one of the rolls, the device comprising at least one rotatable disc element.

2. The roller crusher according to claim 1, wherein the device of the first type comprises a plurality of rotatable disc elements.

3. The roller crusher according to claim 2, wherein the plurality of disc elements are individually rotatable.

4. The roller crusher according to claim 1, wherein the at least on element comprises at least one circumferential protrusion.

5. The roller crusher according to claim 4, wherein the at least one circumferential protrusion comprises at least one spur.

6. The roller crusher according to claim 5, wherein the at least one spur comprises 4 to 25 spurs.

7. The roller crusher according to claim 5, wherein the at least one plurality of spurs is arranged on a central hub portion.

8. The roller crusher according to claim 1, wherein the at least one disc element each have a thickness between 4-50 mm, more preferably 3-30 mm and even more preferably 4-15 mm.

9. The roller crusher according to claim 5, wherein the at least one spur each has a length between 25-150 mm, more preferably 50-100 mm.

10. The roller crusher according to claim 1, wherein the roller crusher comprises more than one device of the first type for loosening granular material.

11. The roller crusher according to claim 1, wherein the roller crusher comprises a device of a second type for removing the granular material, said device of the second type is arranged downstream the device of the first type.

12. The roller crusher according to claim 11, wherein the device of the second type comprises a scraper.

13. A method for loosening granular material present on a crushing surface of at least one roll of a roller crusher, said roller crusher comprising a first grinding roll and a second grinding roll, said first and second grinding rolls being arranged generally in parallel to each other and to define a crushing gap therebetween and drivable in a counter-rotating manner, said method comprising the following step providing a device of a first type on the roller crusher, said device comprising at least one rotatable disc element, said at least one rotatable disc element being arranged to face said at least one roll and adjacent to the crushing surface of the roll such that, when build-up of granular material on the crushing surface of the roll reaches a predefined thickness, at least one rotatable disc element come in contact with the granular material.

14. The method according to claim 13, said method further comprises penetrating the granular material with the at least one rotatable disc element.

15. The method according to claim 13, said method further comprises loosening the granular material with the at least one rotatable disc element.

16. The method according to claim 13, said method further comprising providing a device of a second type on the roller crusher arranged downstream the device of the first type, and removing the loosened granular material using the device of the second type.

17. The method according to claim 16, wherein said device of the second type comprises a scraper.

18. A refitting kit for a roller crusher having a first grinding roll and a second grinding roll, said first and second grinding rolls being arranged generally in parallel to each other and to define a crushing gap therebetween and drivable in a counter-rotating manner, wherein the refitting kit comprises a device of a first type for loosening granular material present on a crushing surface of at least one of the rolls, the device comprising at least one rotatable disc element.

Description

BRIEF DESCRIPTIONS OF THE DRAWINGS

[0052] The disclosure will by way of example be described in more detail with reference to the appended [schematic] drawings, which show presently preferred embodiments of the disclosure.

[0053] FIG. 1 shows a perspective view of a roller crusher according to prior art.

[0054] FIG. 2A is an isomeric view of a roller crusher including a first grinding roll constructed in accordance with an embodiment of the present disclosure, and a second grinding roll.

[0055] FIG. 2B is an isomeric view of a roller crusher including two grinding rolls constructed in accordance with an embodiment of the present disclosure.

[0056] FIG. 3A illustrates a device in accordance with an embodiment of the present disclosure.

[0057] FIG. 3B illustrates a device in accordance with an embodiment of the present disclosure.

[0058] FIG. 3C illustrates a side view of a disc element comprised in a device in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION

[0059] The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which currently preferred embodiments of the disclosure are shown. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and to fully convey the scope of the disclosure to the skilled person.

[0060] FIG. 1 shows a roller crusher 1 for comminution of materials according to the prior art. Such roller crusher 1 comprises a frame 2 in which a first grinding roll 3 and a second grinding roll 4 is arranged. The first and second grinding rolls 3, 4 are arranged generally in parallel to each other and to define a crushing gap therebetween. The grinding rolls 3, 4 are drivable in a counter-rotating manner. Each of the grinding rolls 3, 4 comprises a roll body 21, 21′. The roll body 21, 21′ has a crushing surface 15, 15′, which is a cylindrical outer surface of the roll body 21, 21′, and a cylindrical inner surface. The crushing surface 15, 15′ extend axially between a first end 25, 25′ and a second end 26, 26′ of the roll body 21, 21′.

[0061] The first grinding roll 3 is arranged in first bearings 5, 5′. The first bearing housings 35, 35′ of these first bearings 5, 5′ are fixedly attached to the frame 50 and are thus immovable. The second grinding roll 4 is arranged in second bearings 6, 6′ which are arranged in the frame 2 in a slidable movable manner. The second bearings 6, 6′ may move in the frame 2 in a direction perpendicular to a longitudinal direction of the first and second grinding rolls 3, 4. Typically, a guiding structure 7, 7′ is arranged in the frame 2 on first and second sides 50, 50′ along upper and lower longitudinal frame elements 12, 12′, 13, 13′ of the roller crusher 1. The second bearings 6, 6′ are arranged in second bearing housings 8, 8′ which are movable and may slide along the guiding structure 7, 7′. Further, a number of hydraulic cylinders 9, 9′ are arranged between the second bearing housing 8, 8′ and first and second end supports 11, 11′ which are arranged near or at a first end of the roller crusher 1. These end supports 11, 11′ attach the upper and lower longitudinal frame elements 12, 12′, 13, 13′ and also act as support for these forces occurring at the hydraulic cylinders 9, 9′ as they are adjusting the gap width and reacting to forces occurring at the grinding rolls 3, 4 due to material fed to the roller crusher 1. Such roller crushers 1 work according to the earlier disclosed crushing technique called interparticle crushing, and the gap between the crushing rolls 3, 4 is adjusted by the interaction of feed load and the hydraulic system effecting the position of the second grinding roll 4.

[0062] As further illustrated in FIG. 1, the first grinding roll 3 has a flange 34, 34′ attached to a first end 25 and a second end 26 of the roll body 21. The flanges 34, 34′ extend in a radial direction of the roll 3 and has a height above the crushing surface 15 of the roll 3.

[0063] In an alternative embodiment, the flanges 34, 34′ are arranged on the second grinding roll 4, instead of on the first grinding roll 3.

[0064] In an alternative embodiment, and as further illustrated in FIG. 2B, one of the flanges 34 is arranged on the first grinding roll 3 and the other one of the flanges 34′ is arranged on the second grinding roll 4.

[0065] FIGS. 2A-B illustrate different arrangements of the grinding rolls 3, 4 by way of example. FIG. 2A is in line with the arrangement of FIG. 1, wherein the flanges 34, 34′ are arranged on the first and second ends 25, 26 of the first grinding roll 3. FIG. 2B illustrates the alternative embodiment, wherein one of the flanges 34′ is arranged on the second end 26 of the first grinding roll 3 and the other one of the flanges 34 is arranged on the first end 25′ of the second grinding roll 4. It should be noted, although not illustrated, that the grinding rolls 3, 4 may be arranged without any flanges 34, 34′ as well.

[0066] In addition to what have been discussed in connection with FIG. 1, the first and second grinding rolls 3, 4 are each respectively rotatable about a shaft 23, 23′ in opposite directions, towards each other. The roll body 21, 21′ of respective grinding roll 3, 4 extends along and is rotatable about a longitudinal axis that passes through the center of the shaft 23, 23′. Preferably, the inner surface of the roll body 21, 21′ receives and engages the shaft 23, 23′ that imparts rotation to the grinding roll 3, 4. The two generally parallel grinding rolls 3, 4 are separated by the gap.

[0067] The material to be comminuted by the roller crusher 1 may, during operation, create a material build-up, also called autogenous layer, on the crushing surfaces 15, 15′ of the two grinding rolls 15, 15′. The material to be comminuted by the roller crusher 1 may also, during operation, create a material build-up between the crushing surface 15, 15′ and the flange 34, 34′. The roller crusher 1 further comprises a device of a first type 300 arranged for loosening the granular material present on the crushing surface 15, 15′ of at least one of the rolls 3, 4. The device 300 is arranged for loosening the material present between the crushing surface 15, 15′ and the flange 34, 34′.

[0068] The device 300 may be attached to fastening means 202 by means of a fastening device 308. The fastening means 202 may be attached to the roller crusher 1, e.g. to the frame 2 of the roller crusher 1 in the figures, the device is attached to an upper part of the frame 2. It is, however, possible to arrange the device at a lower part of the frame 2. The device 300 may be arranged upstream or downstream the crushing gap arranged between the two grinding rolls 3, 4.

[0069] The device 300 comprises at least one rotatable disc element 302. As illustrated in further detail in FIGS. 3A-C, the device 300 comprises a plurality of rotatable disc elements 302. The plurality of rotatable disc elements 302 is arranged to face one of the two grinding rolls 3, 4. The disc elements 302 may be adjacent to the crushing surface 15, 15′ of the grinding roll 3, 4. Thereby, when build-up of granular material on the crushing surface 15, 15′ of the grinding roll 3, 4 reaches a predefined thickness, at least one rotatable disc element 302 will come in contact with the granular material. Thus, the disc elements 302 are arranged to loosen the granular material on the crushing surface 15, 15′. The device 300 penetrates and displaces the granular material on the crushing surface 15, 15′ thereby loosening the material. According to one embodiment, the device 300 may be arranged to loosen the material during operation of the roller crusher 1. According to one embodiment, the device 300 may be arranged to loosen the material during shutdown or startup of the roller crusher 1. It should be noted that the device 300 may be arranged to loosen the material during both operation and shutdown or startup of the roller crusher 1.

[0070] The roller crusher 1 further comprise a device of a second type 400 The device of the second type 400 may be arranged for removing the loosened material present on the crushing surface 15, 15′ such as in the transition between the crushing surface 15, 15′ and the flange 34, 34′. The device of the second type 400 may be arranged downstream the device of the first type 300. The device of the second type 400 may be a scraper. The device of the first type 300 may be loosening the material on the crushing surface 15, 15′ and the device of the second type 400 may be removing the loosened material on the crushing surface 15, 15′. The device of the second type 400 may be attached to fastening means 204. The fastening means 204 may be attached to the roller crusher 1, e.g. to the frame 2 of the roller crusher 1.

[0071] As illustrated in FIG. 2A, two devices of the first type 300 are arranged opposite each other, on each side of the grinding roll 3. Two devices of the second type 400 are arranged opposite each other, on each side of the grinding roll 3. However, it should be noted that, if more than one device of the same type is comprised in the roller crusher 1, the more than one device of the same type may be arranged independently of the other devices of the same type. Hence, the devices of the same type may not have to be arranged opposite each other.

[0072] With reference to FIGS. 3A-C, the device of the first type 300 is illustrated in more detail. The device of the first type 300 comprises the plurality of rotatable disc elements 302. The plurality of disc elements 302 are individually rotatable. By having the plurality of disc elements 302 individually rotatable, one or more of the disc elements 302 may come in contact with the material on the crushing surface 15, 15′. The plurality of disc elements 302 may each have a thickness between 3-50 mm, more preferably 3-30 mm, or more preferably 4-20 mm and even more preferably 4-15 mm.

[0073] The plurality of disc elements comprises circumferential protrusions. The circumferential protrusions comprise at least one spur 304. As illustrated in the figures, the circumferential protrusions comprise a plurality of spurs 304. The plurality of spurs 304 may each have a length between 25-150 mm, more preferably 50-100 mm. This may be advantageous as one or more of the spurs 304 may come in contact with the material on the crushing surface 15, 15′ but necessarily not all of the spurs 304.

[0074] The plurality of spurs comprises 4-25 spurs. Thus, it may be possible to design the device 300 with the spurs 304 in different ways based on e.g. the roller crusher 1 or the material to be comminuted. It should be noted that these are only examples and the design of the device 300 may be based on other parameters as well.

[0075] The plurality of spurs 304 is arranged on a central hub portion 306. The central hub portion 306 is attached to the fastening device 308 by means of a bolt. The fastening device 308 is for attaching the device 300 to the roller crusher 1. The fastening device 308 may be attached to the fastening means 202 as illustrated in FIGS. 2A-B. The fastening device 308 may be attached to the roller crusher 1 by using other types of fastening or attaching means as well. It should further be noted that the device 300 may be attached to the roller crusher 1 by using other types of fastening or attaching devices as well.

[0076] The person skilled in the art realizes that the present disclosure by no means is limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims.

[0077] For example, the device of the first type may be of any suitable size and shape depending on the material to be comminution and on the type of roller crusher that is used. The number of devices comprises in the roller crusher may also depend on the material to be comminuted and on the type of roller crusher that is used.

[0078] Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed disclosure, from a study of the drawings, the disclosure, and the appended claims.