Patent Description:
When comminuting or crushing materials, such that rock, ore, cement clinker or other hard materials, using grinding assemblies or the like is well known in the art. The grinding assembly may have two grinding rolls for the pressure comminution of materials. Preferably, the two grinding rolls are arranged generally parallel and configured to rotate opposite directions, towards each other, wherein the two grinding rolls are separated by a gap. The material to be comminuted is fed by gravity or choke-fed into the gap. One type of grinding assembly is called high pressure grinding rollers or high pressure roller crusher. Sometimes, this type of grinding assembly uses a crushing technique called interparticle crushing. Here, the material to be comminuted or crushed is crushed not only by the crushing surface of the rolls, but also by particles in the material to be comminuted or crushed, hence the name interparticle crushing. However, a problem that may occur when feeding the material into the gap is to keep the material between the grinding roll(s) and to direct the material into the gap.

In an attempt to meet this problem, European Patent <CIT> suggests introducing flanges on one of the two grinding rolls.

Such flanges are exposed to a lot of wear from the material to be crushed, but the flanges are also exposed to pressure exerted by the material.

Further, flanges may be exposed to different amount of wear on different parts of the flange.

Even further, such flanges may, in case of skewing, interfere with the edges of the opposite grinding roll and cause damage to both the flanges as well as the edges of the opposite grinding roll.

Thus, the conventional grinding rolls arranged with flanges, as the grinding roll described in <CIT>, are associated with several drawbacks. There is thus a need in the art for an improved flange.

An object of the invention is to provide for an increased life of the flange during operation of a grinding assembly.

Another object of the invention is to provide for an improved flange design compared to conventional flanges known in the art.

Another object of the invention is to provide for a more stable grinding roll during skewing events, wherein the grinding roll comprises at least one flange.

According to a first aspect of the invention these and other objects are achieved, in full or at least in part, by a grinding roll comprising:.

the flange comprises wear protection liner elements on the first surface.

According to the invention liner elements on the first surface comprises at least one radially lower part adjacent the cylindrical outer surface, and at least one radially upper part adjacent the outer edge of the flange,
wherein the at least one radially lower part comprises a first type of wear protection liner elements and the at least one radially upper part comprises a second type of wear protection liner elements, and wherein an average covering area of the second type of wear protection liner elements is larger than that of the first type of wear protection liner elements.

By the term "attached" is here meant that the flange is fastened or mounted to, or in close proximity to, the at least one of the first and second end of the roll body in order to be kept in place. The flange is attached to the at least one of the first and second end of the roll body by means of a bolt and nut arrangement or screws. However, it should be noted that adhesives, welding, Velcro, magnets, or other, similar means may be used as well. In this way, it is possible to remove or replace the flange in an easy way. According to one non-limiting example, the flange may be attached to the roll body in one piece, wherein the flange is in one piece. According to another non-limiting example, the flange may be divided into a plurality of segments, wherein each segment may be attached to the roll body. The flange may be divided into the plurality of segments in order to facilitate manufacturing and mounting of the same. Preferably, the plurality of segments may be attached to each other by stitch plates, sometimes also called fish plate or joint plates, or the like.

By the term "first surface" is here meant a surface facing inwardly over the cylindrical outer surface of the roll body and forming a perpendicular continuing surface with the cylindrical outer surface.

By the term "second surface" is here meant the surface of the flange facing exterior or outwardly of the roller body forming a continuing surface with the at least one of the first and second end of the roll body.

When the flange is attached to the at least one of the first and second end of the roll body, the first surface is exposed to a lot of wear from the material during operation, while the second surface is not. Thus, it is the first surface that should be improved such that the lifetime of the flange may be increased. Therefore, by introducing wear protection liner elements on the first surface of the flange, it is possible to provide for a more durable flange such that the lifetime of the flange is increased.

The disclosed grinding roll may be advantageous as it allows for the wear protection liner elements to vary over the first surface of the flange, wherein the radially lower part comprises the first type of wear protection liner elements and the radially upper part comprises the second type of wear protection liner elements. This is advantageous because the radially lower and the radially upper part of the first surface of the flange usually are exposed to different wear. By introducing the first and second types of wear protection liner elements, wherein an average covering area of the second type of wear protection liner elements is larger than that of the first type of wear protection liner elements, provides for that it is possible to tailor the respective type of wear protection liner elements based on the wear on the flange. Although the average covering area of the second type of wear protection liner elements is larger than that of the first type of wear protection liner element, it should be noted that a covering area of individual elements of the second type of wear protection liner elements may be smaller than a covering area of individual element of the first type of wear protection liner element and vice versa. Preferably, the first type of wear protection liner elements should be fabricated with high strength "ductile" material to resist high load. Preferably, the second type of wear protection liner elements uses a wear resistant material such that tungsten carbide or ceramics. With the present disclosure, a more durable flange and hence, the lifetime of the flange may be improved.

According to an embodiment, the covering area of each of the second type of wear protection liner elements is larger than that of each of the first type of wear protection liner elements.

According to an embodiment, the first type of wear protection liner elements is arranged as a mosaic pattern on the at least one radially lower part of the flange.

An advantage with this embodiment is that efficient use of the first type of wear protection liner elements is provided. Thus, in the at least one radially lower part of the flange, there are little or no material movements in relation to the first surface of the flange during operation and hence, the lower part is not exposed to excessive abrasive wear based on the material movements. All material in the lower part of the flange may be exposed to crushing forces and the material is moving with the flange and hence, creates little or no abrasive wear on the flange. As there is little or no abrasive wear on the flange in this radially lower part of the flange, there is no need for a wear protection liner element with full covering of the flange. On the other hand, this area may be subjected to large axial forces, which may cause the first type of wear protection liner elements to crack should each wear protection liner elements have a large covering area. Thus, this first type of wear protection liner elements is preferably arranged in a mosaic pattern. The wear protection liner elements may have a hexagonal shape and may be arranged such that they do not cover the entire surface of this area.

According to an embodiment, the first type of wear protection liner elements comprises studs arranged in recesses provided in the at least one radially lower part of the flange.

An advantage with this embodiment is that the studs may be removable or replaceable when worn out. Again, as discussed in previous embodiment, the low or no abrasive wear in this area allows for not fully covering wear protection. Instead the axial forces are more troublesome in this area. Studs having a small wear protection liner area facing the axial forces of the material to be grinded and having an axial extension within the flange will handle these axial forces well in this at least one radially lower part of the flange. Such studs are easy to manufacture. Hence, this embodiment may provide for an increased lifetime of the flange.

According to an embodiment, the second type of wear protection liner elements comprises tile plates removably arranged in a close pattern along at least one radially upper part adjacent the outer edge of the flange.

An advantage with this embodiment is that the lifetime of the flange is further improved.

A further advantage with this embodiment, and especially with the tile plates, is that this material is hard, but brittle, which is preferred features for the second type of wear protection liner elements. Thus, in the at least one radially upper part adjacent the outer edge of the flange, the flange is exposed to a lot of abrasive wear but low axial load, therefore it is preferably that the wear protection liner elements in this radially upper part of the flange is harder and each wear protection liner elements covering larger area.

By the disclosed design, where the tile plates are arranged in a close pattern facilitates provision of an improved protection against abrasive wear. Thus, when the tile plates are arranged in the close pattern, the flange is protected against wear to a greater extend compared to e.g. when the first type of wear protection liner elements being arranged as a mosaic pattern as discussed above. Usually, the at least one radially upper part is exposed to a lot of wear from e.g. material movements. Therefore, by this arrangement, the lifetime of the flange may be further improved.

In addition, by the term "removably arranged" is here meant that the tile plates may be removed and replaced in an easy way when they are worn out. Thus, instead of replacing the flange, it is possible to replace the tile plates instead. Preferably, the tile plates are arranged on the at least one radially upper part adjacent the outer edge of the flange by using a nut and bolt arrangement or screws, but adhesive or other similar means may also be used.

According to an embodiment, an elastic shim is arranged between the second type of wear protection liner elements and the flange.

An advantage with this embodiment is that the impact on the flange during skewing events may be reduced. Thus, introducing the elastic shim between the second type of wear protection liner elements and the flange will reduce the impact on the flange and an edge on the opposite roller body during skewing events that may occur during operation of the grinding roll in a grinding assembly. A further advantage with this embodiment is that a stable grinding roll during operation, and especially during skewing events, may be achieved. Preferably, the elastic shim is arranged between the second type of wear protection liner elements and the flange by using a nut and bolt arrangement or screws. However, other fastening or mounting arrangements may be possible as well.

According to an embodiment, the elastic shim comprises a spring assembly arranged between the second type of wear protection liner elements and the flange. The spring assembly may be attached between the second type of wear protection liner elements and the flange by installing the spring assembly from a second surface of the flange, through the flange, towards the second type of wear protection liner elements arranged on the first surface of the flange.

According to an embodiment, the elastic shim comprises a rubber mat, or a spring assembly.

According to an embodiment, the grinding roll having a flange attached to each of the first and second end of the roll body.

According to a second aspect of the disclosure, these and other objects are also achieved, in full or at least in part, by a grinding assembly for comminution of material, comprising
two generally parallel grinding rolls arranged to rotate in opposite direction, towards each other, and separated by a gap, wherein the grinding assembly comprises at least one grinding rolls as disclosed with respect to the first aspect.

According to an embodiment, the grinding assembly comprises two grinding rolls, wherein each grinding roll having a flange attached to one of the first and second end of the roll body. Preferably, when the grinding rolls are arranged to rotate in opposite direction, towards each other, the flange on respective grinding roll should be positioned on opposite sides of the respective grinding roll.

According to another embodiment, the grinding assembly comprises two grinding rolls, wherein one of the two grinding rolls having two flanges attached to the first and second end of the roll body, and the other one having no flanges.

It should be noted that these embodiments are only examples and other arranged within the present disclosure is possible as well.

According to a third aspect of the invention these and other objects are also achieved, in full or at least in part, by a flange ring segment arrangeable at a grinding roll along an edge thereof, the flange ring segment comprising a first surface and a second surface, the first surface forming a perpendicular continuing surface with a cylindrical outer surface of a grinding roll when arranged thereat, and the second surface forming a continuation of the an end of the grinding roll when arranged thereat; and
the flange ring segment comprising wear protection liner elements on the first surface.

According to the invention the first surface comprising at least one radially lower part adjacent the cylindrical outer surface of the grinding roll when arranged thereat and at least one radially upper part adjacent an outer edge of the flange ring segment,
wherein the at least one radially lower part comprises a first type of wear protection liner elements and the at least one radially upper part comprises a second type of wear protection liner elements, and wherein an average covering area of the second type of wear protection liner elements is larger than that of the first type of wear protection liner elements.

According to an embodiment, the first type of wear protection liner elements is arranged as a mosaic pattern on the at least one radially lower part of the flange ring segment.

According to an embodiment, the first type of wear protection liner elements comprises studs arranged in recesses provided in the at least one radially lower part of the flange ring segment.

According to an embodiment, the second type of wear protection liner elements comprises tile plates removably arranged in a close pattern along at least one radially upper part adjacent the outer edge of the flange ring segment.

According to an embodiment, an elastic shim is arranged between the second type of wear protection liner elements and the flange ring segment.

According to an embodiment, the elastic shim comprises a rubber mat or a spring assembly.

Other objectives, features, and advantages of the present invention will appear from the following detailed disclosure, from the attached claims, as well as from the drawings. It is noted that the invention relates to all possible combinations of features.

The invention will be described in more detail with reference to the appended schematic drawings, which show an example of a presently preferred embodiment of the invention.

The present invention 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 invention to the skilled addressee.

<FIG> illustrates a grinding roll <NUM>. The grinding roll <NUM> may be used in a grinding assembly <NUM> for comminution of materials. The grinding assembly is further illustrated and discussed in connection with <FIG> and <FIG>. The grinding roll <NUM> comprises a roll body <NUM>. The roll body <NUM> has a cylindrical outer surface <NUM> and a cylindrical inner surface <NUM>. The cylindrical outer surface <NUM> extend axially between a first end <NUM> and a second end <NUM> of the roll body <NUM>. Preferably, the roll body <NUM> is made of a durable, metallic material.

The roll body <NUM> comprises a flange <NUM>. The flange <NUM> is attached to the first end <NUM> of the roll body <NUM>. The flange <NUM> has an outer edge <NUM>. The outer edge <NUM> of the flange <NUM> extends radially past the cylindrical outer surface <NUM> of the roll body <NUM>. The flange <NUM> may be attached to the roll body by bolt arrangement <NUM>, see e.g. <FIG>. However, it should be noted that the grinding roll <NUM> may comprise another flange <NUM> attached to the second end <NUM> of the roll body <NUM>. Thus, the grinding roll <NUM> may comprise at least one or two flange(s) being attached to the first end <NUM> and/or the second end <NUM> of the roll body <NUM>. With reference to <FIG>, the flange <NUM> is formed from a plurality of separate flange segments <NUM>. Preferably, the flange <NUM> may be formed of any number of flange segments <NUM>. However, it should be noted that the flange <NUM> may be arranged as one single unitary section as well or as an integral part of the roll body.

The flange <NUM> has a first surface <NUM> forming a perpendicular continuing surface with the cylindrical outer surface <NUM> of the roll body <NUM>. The flange <NUM> has a second surface <NUM> forming a continuation of the at least one of the first and the second end <NUM>, <NUM> of the roll body <NUM> (see <FIG> for the second surface). The first surface <NUM> comprises at least one radially lower part <NUM> and at least one radially upper part <NUM>. The at least one radially lower part <NUM> is adjacent the cylindrical outer surface <NUM> of the roll body <NUM>. The at least one radially upper part <NUM> is adjacent the outer edge <NUM> of the flange <NUM>. The at least one radially lower part <NUM> comprises a first type of wear protection liner elements <NUM>. The at least one radially upper part <NUM> comprises a second type of wear protection liner elements <NUM>. The first and the second type of wear protection liner elements <NUM>, <NUM> is further discussed in connection with <FIG> and <FIG>.

The roll body <NUM> comprises a series of receiving bores that extends radially into the roll body <NUM> from the cylindrical outer surface <NUM>. Each of the receiving bores receives a stud <NUM>. Each of the studs <NUM> is formed from a material that is more durable than the roll body <NUM>. The studs <NUM> may be replaced when worn to extend the life of the grinding roll <NUM>. Preferably, the top end of the stud <NUM> extends past the cylindrical outer surface <NUM> such that material contacting the grinding roll <NUM> is first engaged by the top end of the stud <NUM>. The crushed material forms a bed of material between the studs <NUM> to also enhance the durability of the cylindrical outer surface <NUM>.

The roll body <NUM> comprises a plurality of edge wear protection bodies <NUM>. The plurality of edge wear protection bodies <NUM> are arranged along the circumference of the roll body <NUM>. The plurality of edge wear protection bodies <NUM> extends from the first end <NUM> or the second end <NUM> of the roll body <NUM> to the series of receiving bores.

The plurality of edge wear protection bodies <NUM> may preferably be arranged on an edge ring or edge segments <NUM> forming an edge ring.

However, it should be noted that the roll body <NUM> may be arranged without the series of the receiving bores and/or the edge wear protection bodies <NUM> such that the cylindrical outer surface <NUM> of the roll body <NUM> is smooth without any studs <NUM> and/or edge wear protection bodies <NUM>.

The roll body <NUM> further comprises holes <NUM>. The holes <NUM> may be configured to receive a bolt, screw, or the like in order to attach the flange <NUM> to the roll body <NUM>. Preferably, there are holes <NUM> arranged along the periphery of the first end <NUM> and/or second end <NUM> of the roll body <NUM> in order to attach the flange <NUM> in a simple and secure way. Preferably, the holes <NUM> are pre-drilled holes in order to attach the flange <NUM> in an easy way.

In a similar way the roll body <NUM> may comprise an additional circle of holes configured to receive a bolt <NUM>, screw or the like in order to attach the edge segments <NUM> or edge ring with edge wear protection bodies <NUM>.

<FIG> illustrates different arrangements of the grinding assembly <NUM> for comminution of material by way of example. The grinding assembly <NUM> comprises a first and a second grinding roll <NUM>, <NUM> being generally arranged in parallel. The first and second grinding rolls <NUM>, <NUM> are each respectively rotatable about a respective shaft <NUM> in opposite directions, towards each other. The roll body <NUM> of respective grinding roll <NUM>, <NUM> extends along and is rotatable about a longitudinal axis that passes through the center of the shaft <NUM>. Preferably, the inner surface <NUM> of the roll body <NUM> receives and engages the shaft <NUM> that imparts rotation to the grinding roll <NUM>, <NUM>. The two generally parallel grinding rolls <NUM>, <NUM> are separated by a gap. A mechanical source of pressure (not shown) bias the first and second grinding rolls <NUM>, <NUM> towards each other such that the source of pressure crushes the material passing through the gap.

With reference to <FIG>, and also to <FIG>, a grinding assembly <NUM> during operation, wherein material <NUM> is drawn into the gap, is illustrated by way of example. The grinding assembly <NUM> comprises the first grinding roll <NUM> and the second grinding roll <NUM>. The first grinding roll <NUM> comprises flanges <NUM> attached to the first and second end <NUM>, <NUM> of the roll body <NUM>.

A first straight line A has been drawn from the center of the first grinding roll <NUM> to the center of the second grinding roll <NUM>.

A second straight line B has been drawn from the center of the first grinding roll <NUM> to and through a first point on the first grinding roll <NUM>, at which first point an active engagement between the second grinding roll <NUM> and the material to be crushed is started. The angle formed between the first straight line A and the second straight line B is defined as a nip angle α.

A third straight line C has been drawn from the center of the first grinding roll <NUM> to and through a second point on the first grinding roll <NUM>, at which second point an active crushing of the material between the first and second grinding rolls <NUM>, <NUM> starts during operation of the grinding assembly <NUM>.

The distance between the first point and the second point, as seen along the cylindrical outer surface <NUM> of the second grinding roll <NUM>, defines a pre-compressed section <NUM> during operation of the grinding assembly <NUM>. In the pre-compressed section <NUM>, the outer edge <NUM> of the flange <NUM> attached to the first grinding roll <NUM> extends sufficient radially past the cylindrical outer surface <NUM> of the first grinding roll <NUM> to extend across the gap between the first and the second grinding rolls <NUM>, <NUM> to a point on the second grinding roll <NUM>, at which point the active engagement between the second grinding roll <NUM> and the material <NUM> to be crushed starts. In the pre-compressed section <NUM>, the flanges <NUM> are configured to keep the material <NUM> between the grinding rolls <NUM>, <NUM> such that the material <NUM> may be moved into a crushing section <NUM> between the grinding rolls <NUM>, <NUM>. In the pre-compressed section <NUM>, there may be a lot of material movements when the material <NUM> forms the compact bed of material without any voids therein. Those movements may create a lot of abrasive wear on the at least one radially upper part <NUM> of the first surface <NUM> of the flanges <NUM>. However, the axial load on the at least one radially upper part <NUM> of the first surface <NUM> of the flanges <NUM> is low in the pre-compressed section <NUM>.

The distance between the second point and the first straight line, as seen along the cylindrical outer surface <NUM> of the second grinding roll <NUM>, defines a crushing section <NUM> during the operation of the grinding assembly <NUM>. In the crushing section <NUM>, the at least one radially lower part <NUM> of the first surface <NUM> of the flanges <NUM> extends sufficient radially across the gap, and the at least one radially upper part <NUM> of the flange <NUM> are aligned with a peripheral outer section of the first and/or second end <NUM>, <NUM> of the second grinding roll <NUM>. In the crushing section <NUM>, there is no voids in the material <NUM>. As a consequence, there is no material movements in the crushing section <NUM> in relation to the at least one radially lower part <NUM> of the first surface <NUM> of the flanges <NUM> and hence, low or no abrasive wear on the at least one radially lower part <NUM> of the first surface <NUM> of the flanges <NUM>. All material <NUM> present in this section is exposed to crushing forces.

A difference between the pre-compressed section <NUM> and the crushing section <NUM> is that the material <NUM> in the pre-compression section moves in relation to the flanges <NUM>, while the material <NUM> in the crushing section <NUM> moves with the at least one flange <NUM>. On the other hand, the material <NUM> in the crushing section <NUM> do exert a significant axial force on the flanges <NUM>.

Thus, in the pre-compressed section <NUM>, the at least one radially upper part <NUM> and the at least one radially lower part <NUM> extends across the gap, wherein the at least one radially upper part <NUM> is exposed to a lot of abrasive wear due to the material movements in this section during operation of the grinding assembly <NUM>. In the crushing section <NUM>, the at least one radially lower part <NUM> extends across the gap, wherein the at least one radially lower part <NUM> is exposed to less or no abrasive wear but to a significant axial force during operation of the grinding assembly <NUM>.

As the at least one radially lower part <NUM> and the at least one radially upper part <NUM> may be exposed to different type of wear, e.g. abrasive wear from the moving material and wear in form of axial forces, these should be covered with different wear protection liner elements in order to provide for an increased life of the flange <NUM>.

Referring back to <FIG>, wherein the first type of wear protection liner elements <NUM> and the second type of wear protection liner elements <NUM> was introduced. The at least one radially lower part <NUM>, which is exposed to mainly axial force during operation of the grinding assembly <NUM>, <NUM>, comprises the first type of wear protection liner elements <NUM>. The at least one radially upper part <NUM>, which is exposed to a lot of abrasive wear from the moving material <NUM> during operation of the grinding assembly <NUM>, <NUM>, comprises the second type of wear protection liner elements <NUM>. Preferably, each second type of wear protection liner elements <NUM> has a larger covering area than each first type of wear protection liner elements <NUM>. Since the at least one radially upper part <NUM> is exposed to a lot of abrasive wear during operation, the at least one radially upper part <NUM> should preferably be covered to a larger extend compared to the at least one radially lower part <NUM>, which is also illustrated in the figures of this disclosure. Preferably, the second type of wear protection liner elements <NUM> is arranged in a closer pattern compared to the pattern of the first type of wear protection liner elements <NUM>. The arrangement of the first and the second type of wear protection liner elements <NUM>, <NUM> is discussed in further detail in connection with <FIG>.

Referring back to <FIG>, the grinding assembly <NUM> comprises one grinding roll <NUM> as discussed in connection with <FIG>, herein referred to the first grinding roll <NUM>. The first grinding roll <NUM> comprises one flange <NUM> attached to the first end <NUM> of the roll body <NUM> and one flange <NUM> attached to the second end <NUM> of the roll body <NUM>. The second grinding roll <NUM> in the grinding assembly <NUM> is similar to the grinding roll <NUM> discussed in connection with <FIG> expect that there are no flange(s) <NUM> attached to the roll body <NUM>.

Further to what have been discussed above, a second surface <NUM> of the flange <NUM> is illustrated. The flanges <NUM> are arranged with nut and bolt arrangement <NUM> for attaching the flange <NUM> to the roll body <NUM>. It should be noted that other attaching arrangement may be used as well.

With reference to <FIG>, the grinding assembly <NUM> comprises two grinding rolls <NUM> as discussed in connection with <FIG>. The first grinding roll <NUM> comprises one flange <NUM> attached to the second end <NUM> of the roll body <NUM>, and the second grinding roll <NUM> comprises one flange <NUM> attached to the first end <NUM> of the roll body <NUM>.

<FIG> illustrates one flange segment <NUM> for forming the flange <NUM> from different point of views. <FIG> further illustrates a front view of the flange segment <NUM>. <FIG> illustrates a cross section of the flange segment <NUM>. The flange segment <NUM> is in line with, and has the same features as, the flange <NUM> that has been discussed above in connection with <FIG>, <FIG> and <FIG>. <FIG> also illustrates the first type of wear protection liner elements <NUM> and the second type of wear protection liner elements <NUM> in further detail.

As best illustrated in <FIG>, the first type of wear protection liner elements <NUM> is arranged as a mosaic pattern on the at least one radially lower part <NUM> of the flange segment <NUM>. However, it should be noted that the first type of wear protection liner elements <NUM> may be arranged in any suitable pattern in order to withstand the axial force during operation of the grinding assembly <NUM>, <NUM>. According to one non-limiting example, the first type of wear protection liner elements <NUM> may comprise studs arranged in recesses provided in the at least one radially lower part <NUM> of the flange segment <NUM>. Thus, the first type of wear protection liner elements <NUM> may be arranged in the similar way as on the cylindrical outer surface <NUM> of the roll body <NUM> discussed in connection with <FIG>. The second type of wear protection liner elements <NUM> comprises tile plates arranged in a close pattern along at least one radially upper part <NUM> adjacent the outer edge <NUM> of the flange <NUM>. Preferably, the tile plates are removably arranged along the at least one radially upper part <NUM> such that the tile plates may be replaced when worn in order to increase the life of the flange segment <NUM>.

Each flange segment <NUM> further comprises a section <NUM> arranged to be aligned with the first <NUM> and/or second end <NUM> of the roll body <NUM>. This section comprises holes <NUM>. The holes <NUM> may be aligned with corresponding holes in the roll body <NUM>, which holes are arranged along the periphery of the first <NUM> and/or the second end <NUM> of the roll body <NUM>. In this way the flange <NUM> may be attached in a simple and secure way. These holes <NUM> may be configured to receive a bolt, screw, or the like in order to attach the flange <NUM> to the roll body <NUM>. Preferably, the holes <NUM> are pre-drilled holes in order to attach the flange <NUM> in an easy way. Obviously, other fastening means than bolting are conceivable.

Further to what have been discussed above, <FIG> illustrates an elastic shim <NUM>. The elastic shim <NUM> is arranged between the second type of wear protection liner elements <NUM> and the flange <NUM>. The elastic shim <NUM> is arranged to reduce impact on the flange <NUM> during skewing events and thereby also increase the life of the flange <NUM>. According to one non-limiting example, the elastic shim <NUM> may comprise a rubber mat. Preferably, the elastic shim <NUM> slide into place for the best fitting. Preferably, the elastic shim is arranged between the second type of wear protection liner elements <NUM> and the flange <NUM> by using a bolt and nut arrangement or the like.

<FIG> illustrates a similar view as <FIG> but herein, without the second type of wear protection liner elements <NUM> such that the elastic shim <NUM> is shown in a better view. The elastic shim <NUM> may be arranged from a plurality of elastic shim segments as illustrated in the figure. However, it should be noted that the elastic shim <NUM> may be arranged as one single unitary section as well. The elastic shim <NUM> comprises one or more holes <NUM>. The holes <NUM> are arranged to attach the elastic shim <NUM> to the flange <NUM> in a simple and secure way. These holes <NUM> may be configured to receive a bolt, screw, or the like in order to attach the elastic shim <NUM> to the flange <NUM>. Preferably, the holes <NUM> are pre-drilled holes in order to attach the elastic shim in an easy way.

With reference to <FIG> and according to another non-limiting example, the elastic shim <NUM> may comprise a spring assembly <NUM> in order to facilitate the similar provision, namely, to reduce the impact on the flange <NUM> during skewing events. The spring assembly <NUM> is arranged between the second type of wear protection liner elements <NUM> and the flange <NUM>. Although four springs are illustrated for the spring assembly <NUM> in <FIG>, it should be noted that any number of springs may be used for the spring assembly <NUM>. Preferably, the second type of wear protection liner elements <NUM> is slided into place and thereafter, the spring assembly <NUM> is installed from the second surface <NUM> of the flange segment <NUM> as illustrated. A locking plate <NUM> is arranged on the second surface <NUM>, outside the spring assembly <NUM>, in order to keep the spring assembly <NUM> in place. It is further illustrated a nut and bolt arrangement <NUM>, <NUM> for attaching the second type of wear protection liner elements <NUM> to the flange <NUM>, which has been discussed above.

The skilled person realizes that a number of modifications of the embodiments described herein are possible without departing from the scope of the invention which is defined in the appended claims.

Claim 1:
A grinding roll (<NUM>) comprising:
a roll body (<NUM>) having a cylindrical outer surface (<NUM>) extending axially between a first end (<NUM>) and a second end (<NUM>) of the roll body (<NUM>);
a flange (<NUM>) attached to at least one of the first and second end of the roll body (<NUM>),
the flange (<NUM>) having an outer edge (<NUM>) that extends radially past the cylindrical outer surface of the roll body (<NUM>),
the flange (<NUM>) having a first surface (<NUM>) and a second surface (<NUM>), the first surface (<NUM>) forming a perpendicular continuing surface with the cylindrical outer surface of the roll body (<NUM>), and the second surface (<NUM>) forms a continuation of the at least one of the first and second end (<NUM>, <NUM>) of the roll body (<NUM>); and
the flange (<NUM>) comprises wear protection liner elements on the first surface (<NUM>), wherein
the first surface comprising at least one radially lower part (<NUM>) adjacent the cylindrical outer surface of the roll body (<NUM>), and at least one radially upper part (<NUM>) adjacent the outer edge (<NUM>) of the flange (<NUM>),
characterized in that
the at least one radially lower part (<NUM>) comprises a first type of wear protection liner elements(<NUM>) and the at least one radially upper part (<NUM>) comprises a second type of wear protection liner elements (<NUM>), and wherein an average covering area of the second type of wear protection liner elements (<NUM>) is larger than that of the first type of wear protection liner elements (<NUM>).