Grinding roller

Abstract

The grinding roller includes a roller body having a cylindrical outer surface extending in an axial direction between a pair of opposing ends; a side groove is formed at each end of the roller body and comprises a supporting shoulder which is recessed from the cylindrical outer surface and / or the surface of the opposite end; the edge ring comprises a plurality of spaced accommodating cavities; a plurality of wear members each housed and retained in at least one housing cavity of an edge ring, the wear members being positioned along the edge ring to define an edge of the grinding roller, the edge ring being housed in each side groove; the grinding roller includes a roller body having a cylindrical outer surface, each wear member having an angled outer surface to provide an angled wear protection surface with the cylindrical outer surface, the grinding roller further including a flange ring disposed adjacent to and attached to an end surface of the roller body and / or the edge ring, the flange ring having an outer edge extending radially through the outer surface of the roller body, the angled outer surface of each wear member partially protrudes with respect to the cylindrical outer surface and is inclined in a direction toward the center of the roller body.

Description

[0001] This application is a divisional application of the invention patent application whose applicant is Metso USA, Inc., with an application date of June 16, 2022, application number 202210685676.3, and invention name “Grinding Roller”. Technical Field

[0002] The present disclosure generally relates to a grinding roll, an edge ring segment for a grinding roll, and a grinding assembly including a pair of grinding rolls for comminuting material that provide improved wear protection. Background Art

[0003] Grinding rollers are used in roller crushers to grind materials, such as rock, ore, cement, slag and other hard materials, by introducing the material into a roller nip formed by two counter-rotating grinding rollers that are separated from each other and subjected to a pressing force. The ground material passes through the nip formed between the two grinding rollers. As a result, the surface of the grinding rollers is subject to a high degree of wear.

[0004] One type of roller crusher is known as a high pressure grinding roller or high pressure roller crusher. This type of roller crusher uses a crushing technique known as inter-particle crushing. Here, the material to be crushed or pulverized is not only crushed by the crushing surface of the grinding roller, but also by the particles in the material to be crushed, hence the term inter-particle crushing. In order to achieve a constant crushing result along the entire width of the grinding roller, flanges may be provided at each end of one roller of the roller crusher, in order to prevent the material from coming out of the edges of the roller, which would otherwise lead to a reduced crushing result in these areas. Such a flanged roller crusher is disclosed in EP2756886.

[0005] A common problem associated with existing flanged roll crushers is that, during operation, material accumulates in the corner between the cylindrical outer surface of the grinding roll and the inner surface of the flange. In order to prevent the opposing flangeless roll and flange from deforming and damaging due to localized loads, this accumulation of material must be removed periodically with a scraper. This requires frequent stops of the roll crusher, which is undesirable. Summary of the invention

[0006] It is an object of the present disclosure to provide an improvement over the prior art. More specifically, it is an object of the present disclosure to provide a grinding roller that requires less maintenance.

[0007] Another object of the present disclosure is to provide a grinding assembly that requires less maintenance.

[0008] Yet another object of the present disclosure is to provide edge segments with improved wear protection.

[0009] These and other objects and advantages that will be apparent from the following description of the present disclosure are fully or at least partially achieved by the grinding roller, grinding assembly and edge segment according to the present disclosure.

[0010] According to a first aspect of the present disclosure, these and other objects are achieved in whole or at least in part by a grinding roller comprising a roller body having a cylindrical outer surface extending axially between a pair of opposite ends, and a side groove formed at each end of the roller body. The side groove comprises a support shoulder recessed from the cylindrical outer surface of the roller body and / or from the surface of the opposite end. The grinding roller also comprises an edge ring and a plurality of wear members, the edge ring comprising a plurality of spaced apart receiving cavities, each wear member being received and retained in at least one receiving cavity of the edge ring, wherein the wear members are positioned along the edge ring to define an edge of the grinding roller, wherein the edge ring is received in each side groove. In addition, the plurality of wear members are arranged to provide a wear protection surface at an angle to the cylindrical outer surface of the roller body.

[0011] According to this first aspect, angled wear protection surfaces are provided at the ends of the grinding rollers to prevent material accumulation thereon. Since there is no excessive material accumulation on the roller edge, there is no need to scrape the roller surface, thereby reducing the time required for maintenance of the grinding roller.

[0012] According to one embodiment, the edge ring is formed from a plurality of edge ring segments. In this embodiment, the edge ring segments are joined in an end-to-end or interlocking configuration to provide the edge ring. This allows for a reduction in tension in the edge ring. Providing a plurality of edge ring segments further facilitates maintenance of the grinding roller, since, if necessary, a single segment containing wear or any other defect can be replaced without having to replace the entire edge ring. This is also advantageous since it facilitates manufacture and installation of the edge ring. Preferably, the edge ring is detachably and replaceably attached to the grinding roller by a connector.

[0013] According to one embodiment, the side grooves are arranged to provide support shoulders recessed from each opposing end surface of the roller body.Thereby, support is provided for the edge ring.

[0014] According to one embodiment, the side grooves are arranged to provide support shoulders recessed from the cylindrical outer surface of the roller body and each opposing end surface. This provides good support for the edge ring in both axial and radial directions.

[0015] According to one embodiment, each wear member has an angled outer surface. Providing the angled outer surfaces of the wear members results in increased pressure against the ends of the grinding roller, thereby preventing material from accumulating at the surface there. Preferably, each wear member is removably and replaceably arranged in a respective cavity of the edge ring, allowing replacement of a single wear member when wear reaches an unacceptable level. The wear members are typically made of a hard material, such as tungsten carbide or other hard metal or composite material, which provides good wear resistance under high loads.

[0016] According to one embodiment, the angled outer surface of each wear member of the grinding roller is inclined downward in a direction toward the end of the roller body. In this embodiment, the top portion of the angled outer surface of the wear member is aligned with the cylindrical outer surface of the grinding roller, while the bottom portion of the angled outer surface is at a height radially inward of the cylindrical outer surface of the grinding roller and is aligned with the end surface of the roller body, and the angled outer surface of the wear member is thus inclined downward in a direction toward the end of the roller body.

[0017] According to one embodiment, the grinding roller further comprises a flange ring arranged adjacent to the edge ring and attached to the end surface of the roller body and / or to the edge ring, the flange ring having an outer edge extending radially through the outer surface of the roller body. This prevents material from falling off at the end of the grinding roller, thereby improving the crushing performance along the entire width of the grinding roller.

[0018] According to one embodiment, the flange ring is formed of a plurality of flange ring parts positioned adjacent to each other. This is advantageous because the manufacture and installation of the flange will be facilitated. Preferably, the flange ring parts are detachably and replaceably attached to the grinding roller. This further allows for efficient replacement of any one flange part when necessary without the need to replace the entire flange ring. The flange may be attached to the grinding roller by means of bonding, bolting, threading, welding, brazing or any other suitable fastening technique.

[0019] According to one embodiment of the grinding roller with a flange ring, the angled outer surface of each wear member partially protrudes relative to the cylindrical outer surface of the grinding roller and is inclined in a direction toward the center of the roller body. This provides a protruding angled wear surface, which, together with the opposing roller including an oppositely angled, recessed wear surface, increases the pressure at the end of the grinding roller, thereby preventing the accumulation of material in the corner between the surface of the grinding roller and the flange.

[0020] According to one embodiment of the grinding roller without flange ring, a plurality of wear members are arranged in a stepped configuration, each wear member having a first portion and at least a second portion, wherein the first portion is arranged to be aligned with and adjacent to the end of the cylindrical outer surface, and at least the second portion is aligned with the end surface of the roller body and is arranged radially inside the first portion. Thus, the second portion provides a step arranged radially inside the first portion. More specifically, the first portion provides a surface aligned with and adjacent to the cylindrical outer surface of the roller body, and the second portion provides a surface extending axially from the first portion at a height radially inward of the first portion. The stepped configuration provides a pocket open radially and axially outward at the end of the grinding roller, in which material can accumulate during operation to form an autogenous layer. The autogenous layer thus formed repeats the shape of the material accumulation on the opposite grinding roller at the corner between the roller surface and the inner surface of the flange. Due to the lower initial pressure at the end of the grinding roller, the shape of the material accumulation will be angled, thereby providing an angled wear protection surface. In addition to protecting the grinding roller from uneven excess material buildup at the roller ends, the angled wear protection surface of this embodiment also protects the wear member from wear. According to one embodiment, the stepped configuration of the wear member is achieved by providing a substantially L-shaped wear member.

[0021] According to one embodiment of the grinding roller without flange ring, a plurality of wear members are arranged in at least two rows on the edge ring, a first row being aligned with and adjacent to the end of the cylindrical outer surface and a second row being aligned with the end surface of the roller body and arranged radially inside the first row. The plurality of wear members arranged in two rows allows to optimize the amount of material used for the wear members, which is advantageous considering that such material is more expensive than the material used for the edge ring. Furthermore, if a single wear member needs to be replaced, it can be replaced efficiently.

[0022] According to a second aspect of the present disclosure, these and other objects are also fully or at least partially achieved by a grinding assembly for pulverizing material, the grinding assembly comprising a first and a second substantially parallel grinding roller, which are arranged to rotate in opposite directions toward each other and are separated by a gap. Each of the first and second grinding rollers comprises a roller body and a side groove, the roller body having a cylindrical outer surface extending axially between a pair of opposite ends, and the side groove is formed at each end of the roller body. The side groove comprises a support shoulder recessed from the cylindrical outer surface of the roller body and / or from the surface of the opposite end. Each of the first and second grinding rollers also comprises an edge ring and a plurality of wear members, the edge ring comprising a plurality of spaced apart receiving cavities, each wear member being received and retained in at least one receiving cavity of the edge ring, wherein the wear members are positioned along the edge ring to define the edge of the grinding roller, wherein the edge ring is received in each side groove, and wherein the plurality of wear members of each of the first and second grinding rollers are arranged to provide a wear protection surface angled relative to the cylindrical outer surface of the respective roller body. The first grinding roller also includes a flange ring at each opposite end, the flange rings each having an outer edge extending radially through the cylindrical outer surface of the roller body. The wear protection surface of the first grinding roller is at an opposite angle relative to the wear protection surface of the second grinding roller, thereby providing an angled interface between the two. According to a second aspect, the angled wear protection surface provides increased pressure at the end between the two grinding rollers, preventing excessive and uneven material accumulation in this area. This is advantageous in that it increases the service life of the grinding assembly.

[0023] According to one embodiment, the plurality of wear members of the first grinding roller are arranged to provide an angled wear protection surface that partially protrudes beyond the cylindrical outer surface of the roller body and slopes downward in a direction toward the center of the roller body, and the plurality of wear members of the second grinding roller are arranged to provide an angled wear protection surface that does not protrude beyond the cylindrical outer surface of the roller body and slopes radially downward in a direction toward the end of the roller body. Thus, the angled wear protection surfaces of the first and second grinding rollers, which are arranged oppositely, eliminate local loads generated at the ends of the rollers due to uneven material accumulation. This extends the service life of the grinding assembly and reduces downtime required for maintenance.

[0024] According to one embodiment, the plurality of wear members comprises angled wear protection surfaces of the first and second grinding rollers.Preferably, the wear members are detachably arranged at the edge ring for easy replacement when required.

[0025] According to one embodiment, the plurality of wear members of the first grinding roller are aligned with the cylindrical outer surface of the roller body, and the plurality of wear members of the second grinding roller are arranged in a stepped configuration. The plurality of wear members of the second grinding roller are further arranged to provide a first portion and at least a second portion, wherein the first portion is arranged to be aligned with and adjacent to the end of the cylindrical outer surface, and at least the second portion is aligned with the end surface of the roller body and is arranged radially inside the first portion. In addition, the second portion includes a surface protruding from the first portion in the axial direction of the roller body at a location radially inside the first portion. The stepped configuration of the first and second portions of the plurality of wear members provides a pocket cavity open in the axial direction and radial direction at the end of the second grinding roller. The pocket cavity can contain material to establish an autogenous layer that repeats the shape of the material accumulation on the first grinding roller at the corner between the cylindrical outer surface and the inner surface of the flange. The shape of this material accumulation is angled due to the pressure reduction toward the end of the grinding roller. Thus, the stepped configuration of the wear members of the second roller provides an angled wear protection surface through the autogenous layer established thereon. In addition to preventing uneven and excessive material buildup at the ends of the grinding rollers, the angled wear protection surface composed of the autogenous layer also reduces wear of the wear parts during operation of the grinding assembly.

[0026] According to one embodiment, the plurality of wear members of the second grinding roller are arranged in at least two rows on the edge ring, a first row being aligned with and adjacent to the end of the cylindrical outer surface, forming a first portion, and a second row being aligned with the end surface of the roller body and arranged radially inside the first row, forming a second portion.

[0027] According to a third aspect of the present disclosure, a grinding roller is provided, the grinding roller comprising a roller body and a side groove, the roller body having a cylindrical outer surface extending axially between a pair of opposite ends, the side groove being formed at each end of the roller body, the side groove comprising a support shoulder recessed from the cylindrical outer surface of the roller body and / or from the surface of the opposite end. The grinding roller also comprises an edge ring and a plurality of wear members, the edge ring comprising a plurality of spaced apart accommodation cavities, each wear member being accommodated and retained in at least one accommodation cavity of the edge ring, wherein the wear members are positioned along the edge ring to define the edge of the grinding roller, wherein the edge ring is accommodated in each side groove, and wherein the plurality of wear members are arranged in a stepped configuration, the plurality of wear members of the second grinding roller being arranged to provide a first portion and at least a second portion. The first portion is arranged to be aligned with and adjacent to the end of the cylindrical outer surface, while at least the second portion is aligned with the end surface of the roller body and is arranged radially inward of the first portion. Thus, a stepped configuration having two steps is provided. Alternatively, the wear member may be arranged to provide a third portion providing a third step of the stepped configuration.

[0028] According to one embodiment, a plurality of wear members are arranged in at least two rows on the edge ring, a first row aligned with and adjacent to the end of the cylindrical outer surface, forming a first portion, and a second row aligned with the end surface of the roller body and arranged radially inside the first row, forming a second portion. According to one embodiment, a third row is provided between the first and second rows and is arranged so as to provide a further step to the stepped configuration.

[0029] According to a fourth aspect of the present disclosure, there is provided an edge ring segment which can be arranged at a grinding roller along the edge of a grinding roller, the edge ring segment comprising a plurality of spaced-apart accommodating cavities and a plurality of wear members, each wear member being accommodated and retained in at least one accommodating cavity of the edge ring segment, wherein the wear members are positioned along the edge ring segment to define the edge of the grinding roller when arranged at the grinding roller, and wherein the plurality of wear members are arranged in a stepped configuration so that when the edge ring segment is arranged at a grinding roller having a cylindrical outer surface extending between a pair of opposite ends, a first portion of each wear member comprises a surface aligned with and adjacent to an end of the cylindrical outer surface of the grinding roller, and a second portion of each wear member protrudes axially from the first portion, is aligned with the end surface of the grinding roller, and is arranged radially inward of the first portion.

[0030] The stepped configuration of the wear member provides pockets to hold material and build up an autogenous layer on the edge ring segment. The shape of the autogenous layer will repeat the shape of the buildup on the opposite grinding roller end, providing an angled wear protection surface. This is advantageous in that the autogenous layer reduces wear of the wear member during operation. The stepped configuration can be achieved in a variety of ways. For example, according to one embodiment of the edge ring segment, each wear member is L-shaped to provide a stepped configuration with two steps. Alternatively, in other embodiments, the wear members are arranged to provide a stepped configuration with three or more steps.

[0031] According to one embodiment, a plurality of wear members are arranged in at least two rows on the edge ring segment, such that when the edge ring segment is arranged at a grinding roller having a cylindrical outer surface extending between a pair of opposite ends, a first row is aligned with and adjacent to the end of the cylindrical outer surface of the grinding roller, forming the first portion, and a second row is aligned with the end surface of the grinding roller and is arranged radially inward of the first portion, forming the second portion. This embodiment provides for efficient use of material for the wear members, which is typically more expensive than material for the edge ring segment. Furthermore, in alternative embodiments, a plurality of wear members are arranged in three or more rows on the edge ring segment.

[0032] Other objects, features and advantages of the present disclosure will become apparent from the following detailed description, the appended claims and the accompanying drawings.It is noted that the present disclosure relates to all possible combinations of features.

[0033] Generally, unless otherwise expressly defined herein, all terms used in the claims should be interpreted according to their ordinary meaning in the art. Unless otherwise expressly stated, all references to "a / an / the (element, device, part, means, step, etc.)" should be openly interpreted as referring to at least one instance of the element, device, part, means, step, etc. Unless expressly stated otherwise, the steps of any method disclosed herein do not have to be performed in the exact order disclosed.

[0034] As used herein, the term "comprise" and variations of the term are not intended to exclude other additives, components, integers or steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present disclosure will be described in more detail with reference to the accompanying drawings, which show examples of embodiments of the present disclosure.

[0036] Figure 1 is a perspective view of a grinding assembly known in the art.

[0037] Figure 2 is a cross-sectional view of an end portion of a grinding assembly known in the art.

[0038] Figure 3 is a cross-sectional view of an end portion of a grinding roller and a grinding assembly according to an embodiment of the present disclosure.

[0039] Figure 4 is an enlarged, partially exploded view of a grinding roller according to an embodiment of the present disclosure.

[0040] Figure 5 It is a three-dimensional schematic diagram of an edge ring segment according to an embodiment of one aspect of the present disclosure.

[0041] Figure 6 is a three-dimensional schematic diagram of an edge ring segment according to another embodiment of the present disclosure.

[0042] Figure 7A-7C is a cross-sectional view of an end portion of a grinding roller and a grinding assembly according to an embodiment of the present disclosure.

[0043] Figure 8A-B is a cross-sectional view of an end portion of a grinding roller and a grinding assembly according to an embodiment of the present disclosure.

[0044] Fig. 9 is a three-dimensional schematic diagram of an edge ring segment according to another embodiment of the present disclosure.

[0045] Fig.10 is a perspective view of a grinding assembly according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0046] The present disclosure will be described more fully below with reference to the accompanying drawings, in which currently preferred embodiments of the present disclosure are shown. However, the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments described herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the present disclosure to the skilled addressee. Like reference numerals refer to like elements throughout.

[0047] Figure 1 A grinding assembly 1 known in the art for pressure comminution of materials such as rock, ore, cement, slag and other hard materials is shown. The grinding assembly 1 comprises a pair of grinding rollers 2, 3 positioned adjacent to each other to define an infeed nip 4. During operation, the grinding rollers 2, 3 rotate towards each other according to the arrows so that material is introduced into the infeed nip 4. The grinding rollers 2, 3 are each rotatable about an axis 5, respectively. A mechanical pressure source (not shown) biases the grinding rollers 2, 3 towards each other so that the pressure source crushes the material passing through the infeed nip 4.

[0048] Each grinding roller 2, 3 comprises a roller body 6 having a cylindrical outer surface 7 extending axially between two opposite ends 8. Each roller body 6 is rotatable about a longitudinal axis passing through the center of the shaft 5. Each roller body 6 also comprises an edge ring 9 arranged at each end of the grinding roller 2, 3. Each edge ring 9 comprises a plurality of wear members 10 positioned along the respective edge ring to define the edge of the grinding roller 2, 3. Typically, as Figure 1 As shown, the wear member provides a flat surface edge of the grinding rollers 2, 3. Figure 1 As shown, one of the grinding rollers 3 also includes a flange ring 11 having an outer edge that extends radially beyond the outer surface of the roller body of the grinding roller 3 and is axially positioned outside the roller body 6 of the grinding roller 2. As initially described, a problem with this type of grinding assembly is that material tends to form at the corner 12 (see FIG. 1 ) between the surface of the wear member and the inner surface of the flange. Figure 2 ) at the corners 12. Such material accumulation generates increased local loads in this area during operation, which may lead to damage or deformation of the wear member 10 or the flange 11 of the flangeless grinding roller 2. In order to avoid excessive material accumulation, a scraper is used at certain time intervals to remove the accumulated material in the corners 12.

[0049] The inventors surprisingly found that, however, by providing the wear protection surface at an angle relative to the cylindrical outer surface of the roller body, this excessive material accumulation can be prevented. Figure 3 An embodiment of an inventive grinding assembly is shown accordingly. In this embodiment, the wear members 22, 23 of the grinding rollers 2, 3 have angled outer surfaces 22', 23'. As shown, the wear member 22 of the flangeless grinding roller 2 has an angled outer surface that slopes in a direction toward the end 8 of the roller body 6. More specifically, the angled outer surface 22' slopes downward from the end of the wear member 22 adjacent to and aligned with the cylindrical outer surface 7 to the diagonally opposite end of the wear member 22 adjacent to and aligned with the end 8 of the roller body 6, thereby providing an angled surface extending therebetween.

[0050] On the other side of the infeed nip 4, the wear member 23 of the flanged roll 3 partially protrudes relative to the cylindrical outer surface 7 of the grinding roll 3 and is inclined in a direction toward the center of the roll body 6, providing an angled wear surface 23'. More specifically, the angled outer surface 23' is inclined from the end of the wear member 23 aligned with the end 8 of the roll body 6 and at a height radially outward of the cylindrical outer surface 7 of the roll body 6, toward the diagonally opposite end of the wear member 23 aligned with and adjacent to the cylindrical outer surface 7. Therefore, the two angled wear surfaces 22', 23' are at opposite angles relative to each other, providing an angled interface 13 therebetween.

[0051] Figure 4 A portion of a grinding roller 2 is shown. As shown in the figure, a plurality of wear members 22 are positioned in an end-to-end configuration to define the edge of the grinding roller 2. In an alternative embodiment, the wear members interlock with each other to form the edge of the grinding roller 2. The wear members 23 of the grinding roller 3 can be arranged in the same manner, i.e., in an end-to-end configuration or in an interlocking configuration to form the edge of the grinding roller 3.

[0052] Figure 4 It is further shown that each wear member 22 includes an attachment portion 20 that is received and retained in one of the receiving cavities 24 formed on the edge ring 9. Although the wear members 22 are each shown as being received and retained in one of the receiving cavities 24, the wear members 22 may be configured to include a plurality of subordinate portions that are to be received in adjacent receiving cavities 24 spaced along the edge ring 9. Thus, in one embodiment, one wear member 22 may have several attachment portions 20 to be received in adjacent receiving cavities 24.

[0053] The edge ring 9 is instead received and retained in a side groove 25 formed at the transition between the cylindrical outer surface 7 and the end surface 8 of the roller body 6. The side groove 25 is defined by a support shoulder 18 and an inner wall 19. The inner wall comprises a plurality of holes 16, each of which receives a threaded shaft of a connecting element 14 for fastening the edge ring 9 to the roller body 6. Correspondingly, the edge ring 9 comprises a hole 17 for receiving a head portion of the connecting element 14. The connecting element 14 is usually embedded from the end surface of the grinding roller 2, providing a compact fastening device for the edge ring 9. The edge ring 9 of the grinding roller 3 can be arranged at the roller body 6 in the same way. The embedded arrangement of the connecting element 14 allows the flange ring 11 of the grinding roller 3 to be positioned axially adjacent to the edge ring 9.

[0054] Figure 4 as well as Figure 1-Figure 3 It is further shown that the cylindrical outer surface 7 of the grinding rollers 2, 3 is arranged with wear bodies in the form of studs 15 which are arranged in receiving holes in the cylindrical outer surface 7. However, the cylindrical outer surface may also be arranged with other types of wear protection providing a smooth cylindrical outer surface.

[0055] refer to Figure 5 , showing the edge ring segment 29. The edge ring segment 29 includes a hole 17 for accommodating a fixing device (such as Figure 4 The edge ring segment 29 is shaped so that when a plurality of edge ring segments 29 are arranged in an end-to-end configuration, an edge ring is provided. Thus, the edge ring segment 29, when mounted at the grinding roller, is considered to have a radial extension r parallel to the radial extension of the grinding roller, and a peripheral extension p. The edge ring segment 29 includes spaced apart accommodation cavities (in Figure 5 The wear members 33 are positioned along the edge ring segment 29 to define the edge of the grinding roller when arranged at the grinding roller. The wear members are arranged in a stepped configuration here. More specifically, Figure 5 The wear member 33 shown in FIG. 1 provides a first portion 34 and a second portion 35. The first portion 34 comprises a surface 36 providing a first step, which first step forms an edge of the edge ring segment 29 extending along the peripheral extension p of the edge ring segment. The second portion 35 comprises a surface 37 providing a second step, which second step forms an edge arranged radially inside the first step and extending in the peripheral extension p of the edge ring segment 29. The first and second portions 34, 35 here consist of first and second rows 32, 31 of wear members 33. That is, the wear members 33 are arranged at the edge ring segment 29 in the form of first and second rows 32, 31 at different radial heights of the edge ring segment.

[0056] Figure 6Another edge ring segment 39 is shown, which includes wear members 43 arranged in a stepped configuration. Here, each wear member has an L-shape. The wear members 43 are arranged in an end-to-end configuration and are provided with first and second portions 44, 45. Figure 6 In the embodiment shown, the first portion 44 includes a surface 46 providing a first step forming an edge of the edge ring segment 39 extending along the peripheral extension p of the edge ring segment. The second portion 45 includes a surface 47 providing a second step forming an edge arranged radially inwardly of the first step and extending in the peripheral extension p of the edge ring segment 39.

[0057] Reference now Figure 7A-7C The grinding assembly includes a first and a second grinding roller 2, 3, wherein the first grinding roller 2 includes Figure 5 The edge ring segments shown in Figure 7A-7C The operation process of the grinding assembly is shown in FIG. Fig. 7A , the grinding assembly before operation is shown. In this embodiment, the second roller 3 comprises a flange 11, arranged at the second roller as described above. Furthermore, the edge ring 9 is arranged at the grinding roller 3 in a side groove 26, which is provided with a support shoulder 18 recessed from the end surface of the roller body 6. The edge ring 9 of the second grinding roller 3 also comprises a wear member 10, which has a flat surface substantially aligned with the cylindrical outer surface 7 of the grinding roller 3. The first grinding roller 2 comprises a Figure 5 The edge ring is composed of multiple edge ring segments 29. Figure 4 As shown, the edge ring segment 29 is received in a side groove 25 which is provided with a supporting shoulder 18 which is recessed from the cylindrical outer surface 7 and the end surface 8 of the roller body 6 .

[0058] During operation, a material accumulation 50 will form in the corner between the flat surface of the wear member 10 of the second grinding roller 3 and the inner surface of the flange 11, as shown in FIG. Figure 7B As shown. During further operation, the stepped configuration of the wear member 33 of the first grinding roller 2 provides pockets to contain material and build up an autogenous layer 51 which replicates the shape of the material accumulation 50 on the second grinding roller 3. Due to the pressure reduction between the grinding rollers 2, 3 towards their ends, the shape of the material accumulation or autogenous layer 50, 51 is generally triangular in cross section. The autogenous layer protects the surface of the wear member 10 of the second grinding roller 3 and the surface 37 of the second portion 35 of the wear member 33 of the first grinding roller 2 from wear. The autogenous layers 50, 51 thus formed thus provide angled wear protection surfaces of the first and second grinding rollers 2, 3.

[0059] Reference now Figure 8A-B The grinding assembly includes a first and a second grinding roller 2, 3, wherein the first grinding roller 2 includes Figure 5 and Figure 7A-7C The edge ring segments shown in Figure 8A-B The operation process of the grinding assembly is shown in FIG. Fig. 8A , the grinding assembly before operation is shown. In this embodiment, the second roller 3 comprises a flange 11, which is arranged at the second roller as described above. The first grinding roller 2 comprises an edge ring composed of a plurality of edge ring segments 29, such as Figure 5 and Figure 7A-7C As shown in Figure 4 As shown, the edge ring segment 29 is received in the side groove 25, which is provided with a support shoulder 18 recessed from the cylindrical outer surface 7 and the end surface 8 of the roller body 6. In addition, the second grinding roller 3 also includes Figure 5 The edge ring shown in FIG. 2 , which consists of a plurality of edge ring segments 29 , therefore has the same structure as the first grinding roller 2 .

[0060] During operation, a material accumulation 50 will form in the corner between the stepped configuration of the wear member 33 of the second grinding roller and the inner surface of the flange 11 of the second grinding roller 3, as shown in FIG. Figure 7B As shown. During further operation, the stepped configuration of the wear member 33 of the first grinding roller 2 provides pockets to contain material and build up an autogenous layer 51 which replicates the shape of the material accumulation 50 on the second grinding roller 3. Due to the pressure reduction between the grinding rollers 2, 3 towards their ends, the shape of the material accumulation or autogenous layer 50, 51 is generally triangular in cross section. The autogenous layer protects the surface of the wear member 33 of the first and second grinding rollers 2, 3 from wear. The autogenous layers 50, 51 thus formed provide angled wear protection surfaces of the first and second grinding rollers 2, 3.

[0061] Fig. 9 Another edge ring segment 39 is shown, comprising wear members 43 arranged in a stepped configuration. Here, each wear member has an L-shape, similar to Figure 6 Obviously, similar to Figure 5 A design is also possible in which the wear members are arranged in a stepped configuration. The wear members 43 are arranged in an end-to-end configuration and are provided with first and second portions 44, 45. Figure 5, the first part 44 comprises a surface 46 providing a first step, which forms the edge of the edge ring segment 29 extending along the peripheral extension p of the edge ring segment. The second part 45 comprises a surface 47 providing a second step, which forms an edge arranged radially inside the first step and extends in the peripheral extension p of the edge ring segment 29. In addition, inclined elements 48 are arranged on the surface 47. There is a distance between the inclined elements, so that pockets are created between the inclined elements. These pockets will be filled with material during use, creating a stronger autogenous layer and preventing the autogenous layer from moving in the circumferential direction.

[0062] Fig.10 A grinding assembly 1 is disclosed, wherein both grinding rollers 2, 3 are provided with a Fig. 9 The edge ring segment of the tilting element 48 described in the embodiment of the present invention is shown in FIG. This design provides better material retention and creates a strong autogenous layer protecting the grinding roller and the flange 11. Obviously, such a tilting element can be provided on only one of the grinding rollers 2, 3 and can be used together with the other. Figure 3-8B in combination with any other edge ring designs defined in .

[0063] Those skilled in the art will recognize that several modifications may be made to the embodiments described herein without departing from the scope of the present disclosure as defined in the appended claims.

Claims

1. A grinding roller, comprising: a roller body having a cylindrical outer surface extending axially between a pair of opposite ends; a side groove formed at each end of the roller body, the side groove comprising a support shoulder recessed from the cylindrical outer surface of the roller body and / or the surface of the opposite end; an edge ring including a plurality of spaced apart receiving cavities; as well as a plurality of wear members, each wear member being received and retained in at least one of the receiving cavities of the edge ring, wherein the wear members are positioned along the edge ring to define an edge of the grinding roll, wherein the edge ring is received in each side groove; wherein each of the wear members has an angled outer surface to provide a wear protection surface at an angle to the cylindrical outer surface of the roller body, and wherein The grinding roller further comprises a flange ring arranged adjacent to the edge ring and attached to the end surface of the roller body and / or to the edge ring, the flange ring having an outer edge extending radially through the outer surface of the roller body, wherein the angled outer surface of each wear member partially protrudes relative to the cylindrical outer surface of the grinding roller and is inclined in a direction towards the center of the roller body.

2. The grinding roller according to claim 1, wherein The edge ring is formed from a plurality of edge ring segments.

3. The grinding roller according to claim 1 or 2, wherein: The side grooves are arranged to provide the support shoulders recessed from each opposing end surface of the roller body.

4. The grinding roller according to claim 1 or 2, wherein: The side grooves are arranged to provide the support shoulders recessed from the cylindrical outer surface and each opposing end surface of the roller body.

5. The grinding roller according to claim 1, wherein The flange ring is formed by a plurality of flange ring parts located adjacent to each other.

6. A grinding assembly for comminuting material, comprising first and second substantially parallel grinding rollers, the first and second grinding rollers being arranged to rotate in opposite directions toward each other and separated by a gap, wherein: Each of the first grinding roller and the second grinding roller comprises: a roller body having a cylindrical outer surface extending axially between a pair of opposite ends; a side groove formed at each end of the roller body, the side groove comprising a support shoulder recessed from the cylindrical outer surface of the roller body and / or the surface of the opposite end; an edge ring including a plurality of spaced-apart receiving cavities; and a plurality of wear members, each wear member being received and retained in at least one of the receiving cavities of the edge ring, wherein the wear members are positioned along the edge ring to define an edge of the grinding roll, wherein the edge ring is received in each side groove; wherein the first grinding roller comprises a flange ring at each opposite end, the flanges respectively having outer edges extending radially beyond the cylindrical outer surface of the roller body, wherein the plurality of wear members of each of the first and second grinding rollers are arranged to provide a wear protection surface angled relative to the cylindrical outer surface of the respective roller body, wherein the wear protection surface provided by the wear member of the first grinding roller is inclined in a direction towards the center of the roller body, and wherein the wear protection surface provided by the wear member of the second grinding roller is radially inclined in a direction towards the end of the roller body, and The plurality of wear members include angled wear protection surfaces of the first and second grinding rollers.

7. The grinding assembly according to claim 6, wherein: The plurality of wear members of the first grinding roller are arranged to provide the wear protection surface, which is angled with the cylindrical outer surface of the roller body of the first grinding roller, and the wear protection surface partially protrudes beyond the cylindrical outer surface of the roller body and is inclined downward in a direction toward the center of the roller body, and the plurality of wear members of the second grinding roller are arranged to provide the wear protection surface, which is angled with the cylindrical outer surface of the roller body of the first grinding roller, and the wear protection surface does not protrude beyond the cylindrical outer surface of the roller body and is radially inclined downward in a direction toward the end of the roller body.

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