Grinding roll and a grinding assembly comprising the grinding roll

Abstract

A grinding roll including a roll body having a cylindrical outer surface extending axially between a first end and a second end and a flange attached to at least one of the first and second ends. The flange includes an outer edge that extends radially past the cylindrical outer surface of the roll body. A first surface of the flange forms a perpendicular continuing surface with the cylindrical outer surface of the roll body. A second surface of the flange forms a continuation of one of the first and second ends of the roll body. The flange includes wear protection liner elements on the first surface. The first surface of the flange includes at least one lower part adjacent the cylindrical outer surface of the roll body and at least one upper part adjacent the outer edge of the flange. The lower part includes a first type of wear protection liner elements and the upper part includes a second type of wear protection liner elements. 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 elements.

Claims

1. A grinding roll comprising: a roll body having a cylindrical outer surface extending axially between a first end and a second end of the roll body; a flange attached to at least one of the first and second end of the roll body, the flange having an outer edge that extends radially past the cylindrical outer surface of the roll body, the flange having a first surface and a second surface, the first surface forming a perpendicular continuing surface with the cylindrical outer surface of the roll body, and the second surface forms a continuation of the at least one of the first and second end of the roll body; and the first surface comprising at least one radially lower part adjacent the cylindrical outer surface of the roll body, 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.

2. A grinding roll according to claim 1, wherein 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.

3. A grinding roll according to claim 1, wherein 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.

4. A grinding roll according to claim 1, wherein 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.

5. A grinding roll according to claim 1, wherein an elastic shim is arranged between the second type of wear protection liner elements and the flange.

6. A grinding roll according to claim 5, wherein the elastic shim comprises a rubber mat or a spring assembly.

7. A grinding roll according to claim 1, wherein the grinding roll includes a flange attached to each of the first and second end of the roll body.

8. A grinding assembly for comminution of material, comprising: two parallel grinding rolls arranged to rotate in opposite direction, towards each other, and separated by a gap, wherein the at least one grinding roll comprises: a roll body having a cylindrical outer surface extending axially between a first end and a second end of the roll body; a flange attached to at least one of the first and second end of the roll body, the flange having an outer edge that extends radially past the cylindrical outer surface of the roll body, the flange having a first surface and a second surface, the first surface forming a perpendicular continuing surface with the cylindrical outer surface of the roll body, and the second surface forms a continuation of the at least one of the first and second end of the roll body; and the first surface comprising at least one radially lower part adjacent the cylindrical outer surface of the roll body, 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.

9. A flange ring segment arrangeable at a grinding roll along and 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 an end of the grinding roll when arranged thereat; and 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 pf the first type of wear protection liner elements.

10. A flange ring segment according to claim 9, wherein 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.

11. A flange ring segment according to claim 10, wherein 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.

12. A flange ring segment according to claim 9 wherein 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.

13. A flange ring segment according to claim 9, wherein 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.

14. A flange ring segment according to claim 13, wherein an elastic shim is arranged between the second type of wear protection liner elements and the flange ring segment.

15. A flange ring segment according to claim 9, wherein an elastic shim is arranged between the second type of wear protection liner elements and the flange ring segment.

16. A flange ring segment according to claim 15, wherein the elastic shim comprises a rubber mat or a spring assembly.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

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

(2) FIG. 1 is an isomeric view of a grinding roll.

(3) FIG. 2A is an isomeric view of a grinding assembly including a first grinding roll constructed in accordance with an embodiment of the present disclosure, and a second grinding roll.

(4) FIG. 2B is an isomeric view of a grinding assembly including two grinding rolls constructed in accordance with and embodiment of the present disclosure.

(5) FIG. 3A illustrates a flange segment in accordance with an embodiment of the present disclosure.

(6) FIG. 3B-C illustrates a cross section of a flange segment comprising an elastic shim in accordance with an embodiment of the present disclosure.

(7) FIG. 4A-B illustrates a cross section of a flange segment comprising a spring load in accordance with an embodiment of the present disclosure.

(8) FIG. 5 is a side view of the grinding assembly in FIG. 2A.

DETAILED DESCRIPTION

(9) 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. The present 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 addressee. Like reference characters refer to like elements throughout.

(10) FIG. 1 illustrates a grinding roll 100. The grinding roll 100 may be used in a grinding assembly 200 for comminution of materials. The grinding assembly is further illustrated and discussed in connection with FIGS. 2A-B and 5. The grinding roll 100 comprises a roll body 102. The roll body 102 has a cylindrical outer surface 104 and a cylindrical inner surface 106. The cylindrical outer surface 104 extend axially between a first end 108 and a second end 110 of the roll body 102. Preferably, the roll body 102 is made of a durable, metallic material.

(11) The roll body 102 comprises a flange 112. The flange 112 is attached to the first end 108 of the roll body 102. The flange 112 has an outer edge 114. The outer edge 114 of the flange 112 extends radially past the cylindrical outer surface 104 of the roll body 102. The flange 112 may be attached to the roll body by bolt arrangement 210, see e.g. FIG. 2A. However, it should be noted that the grinding roll 100 may comprise another flange 112 attached to the second end 110 of the roll body 102. Thus, the grinding roll 100 may comprise at least one or two flange(s) being attached to the first end 108 and/or the second end 110 of the roll body 102. With reference to FIG. 1, the flange 112 is formed from a plurality of separate flange segments 130. Preferably, the flange 112 may be formed of any number of flange segments 130. However, it should be noted that the flange 112 may be arranged as one single unitary section as well or as an integral part of the roll body.

(12) The flange 112 has a first surface 116 forming a perpendicular continuing surface with the cylindrical outer surface 104 of the roll body 102. The flange 112 has a second surface 208 forming a continuation of the at least one of the first and the second end 108, 110 of the roll body 102 (see FIG. 2A-B for the second surface). The first surface 116 comprises at least one radially lower part 118 and at least one radially upper part 120. The at least one radially lower part 118 is adjacent the cylindrical outer surface 104 of the roll body 102. The at least one radially upper part 120 is adjacent the outer edge 114 of the flange 112. The at least one radially lower part 118 comprises a first type of wear protection liner elements 122. The at least one radially upper part 120 comprises a second type of wear protection liner elements 124. The first and the second type of wear protection liner elements 122, 124 is further discussed in connection with FIGS. 2A-B and 3A.

(13) The roll body 102 comprises a series of receiving bores that extends radially into the roll body 102 from the cylindrical outer surface 104. Each of the receiving bores receives a stud 126. Each of the studs 126 is formed from a material that is more durable than the roll body 102. The studs 126 may be replaced when worn to extend the life of the grinding roll 100. Preferably, the top end of the stud 126 extends past the cylindrical outer surface 104 such that material contacting the grinding roll 100 is first engaged by the top end of the stud 126. The crushed material forms a bed of material between the studs 126 to also enhance the durability of the cylindrical outer surface 104.

(14) The roll body 102 comprises a plurality of edge wear protection bodies 128. The plurality of edge wear protection bodies 128 are arranged along the circumference of the roll body 102. The plurality of edge wear protection bodies 128 extends from the first end 108 or the second end 110 of the roll body 102 to the series of receiving bores.

(15) The plurality of edge wear protection bodies 128 may preferably be arranged on an edge ring or edge segments 140 forming an edge ring.

(16) However, it should be noted that the roll body 102 may be arranged without the series of the receiving bores and/or the edge wear protection bodies 128 such that the cylindrical outer surface 104 of the roll body 102 is smooth without any studs 126 and/or edge wear protection bodies 128.

(17) The roll body 102 further comprises holes 132. The holes 132 may be configured to receive a bolt, screw, or the like in order to attach the flange 112 to the roll body 102. Preferably, there are holes 132 arranged along the periphery of the first end 108 and/or second end 110 of the roll body 102 in order to attach the flange 112 in a simple and secure way. Preferably, the holes 132 are pre-drilled holes in order to attach the flange 112 in an easy way.

(18) In a similar way the roll body 102 may comprise an additional circle of holes configured to receive a bolt 142, screw or the like in order to attach the edge segments 140 or edge ring with edge wear protection bodies 128.

(19) FIGS. 2A-B illustrates different arrangements of the grinding assembly 200 for comminution of material by way of example. The grinding assembly 200 comprises a first and a second grinding roll 202, 204 being generally arranged in parallel. The first and second grinding rolls 202, 204 are each respectively rotatable about a respective shaft 206 in opposite directions, towards each other. The roll body 102 of respective grinding roll 202, 204 extends along and is rotatable about a longitudinal axis that passes through the center of the shaft 206. Preferably, the inner surface 106 of the roll body 102 receives and engages the shaft 206 that imparts rotation to the grinding roll 202, 204. The two generally parallel grinding rolls 202, 204 are separated by a gap. A mechanical source of pressure (not shown) bias the first and second grinding rolls 202, 204 towards each other such that the source of pressure crushes the material passing through the gap.

(20) With reference to FIG. 5, and also to FIGS. 1-3B, a grinding assembly 500 during operation, wherein material 502 is drawn into the gap, is illustrated by way of example. The grinding assembly 500 comprises the first grinding roll 202 and the second grinding roll 204. The first grinding roll 202 comprises flanges 112 attached to the first and second end 108, 110 of the roll body 102.

(21) A first straight line A has been drawn from the center of the first grinding roll 202 to the center of the second grinding roll 204.

(22) A second straight line B has been drawn from the center of the first grinding roll 202 to and through a first point on the first grinding roll 202, at which first point an active engagement between the second grinding roll 204 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.

(23) A third straight line C has been drawn from the center of the first grinding roll 202 to and through a second point on the first grinding roll 204, at which second point an active crushing of the material between the first and second grinding rolls 202, 204 starts during operation of the grinding assembly 500.

(24) The distance between the first point and the second point, as seen along the cylindrical outer surface 104 of the second grinding roll 204, defines a pre-compressed section 506 during operation of the grinding assembly 500. In the pre-compressed section 506, the outer edge 114 of the flange 112 attached to the first grinding roll 202 extends sufficient radially past the cylindrical outer surface 104 of the first grinding roll 202 to extend across the gap between the first and the second grinding rolls 202, 204 to a point on the second grinding roll 204, at which point the active engagement between the second grinding roll 204 and the material 502 to be crushed starts. In the pre-compressed section 506, the flanges 112 are configured to keep the material 502 between the grinding rolls 202, 204 such that the material 502 may be moved into a crushing section 508 between the grinding rolls 202, 204. In the pre-compressed section 506, there may be a lot of material movements when the material 502 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 120 of the first surface 116 of the flanges 112. However, the axial load on the at least one radially upper part 120 of the first surface 116 of the flanges 112 is low in the pre-compressed section 506.

(25) The distance between the second point and the first straight line, as seen along the cylindrical outer surface 104 of the second grinding roll 204, defines a crushing section 508 during the operation of the grinding assembly 500. In the crushing section 508, the at least one radially lower part 118 of the first surface 116 of the flanges 112 extends sufficient radially across the gap, and the at least one radially upper part 120 of the flange 112 are aligned with a peripheral outer section of the first and/or second end 108, 110 of the second grinding roll 204. In the crushing section 508, there is no voids in the material 502. As a consequence, there is no material movements in the crushing section 508 in relation to the at least one radially lower part 118 of the first surface 116 of the flanges 112 and hence, low or no abrasive wear on the at least one radially lower part 118 of the first surface 116 of the flanges 112. All material 502 present in this section is exposed to crushing forces.

(26) A different between the pre-compressed section 506 and the crushing section 508 is that the material 502 in the pre-compression section moves in relation to the flanges 112, while the material 502 in the crushing section 508 moves with the at least one flange 112. On the other hand, the material 502 in the crushing section 508 do exert a significant axial force on the flanges 112.

(27) Thus, in the pre-compressed section 506, the at least one radially upper part 120 and the at least one radially lower part 118 extends across the gap, wherein the at least one radially upper part 120 is exposed to a lot of abrasive wear due to the material movements in this section during operation of the grinding assembly 500. In the crushing section 508, the at least one radially lower part 118 extends across the gap, wherein the at least one radially lower part 118 is exposed to less or no abrasive wear but to a significant axial force during operation of the grinding assembly 500.

(28) As the at least one radially lower part 118 and the at least one radially upper part 120 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 112.

(29) Referring back to FIG. 1, wherein the first type of wear protection liner elements 122 and the second type of wear protection liner elements 124 was introduced. The at least one radially lower part 118, which is exposed to mainly axial force during operation of the grinding assembly 200, 500, comprises the first type of wear protection liner elements 122. The at least one radially upper part 120, which is exposed to a lot of abrasive wear from the moving material 502 during operation of the grinding assembly 200, 500, comprises the second type of wear protection liner elements 124. Preferably, each second type of wear protection liner elements 124 has a larger covering area than each first type of wear protection liner elements 122. Since the at least one radially upper part 120 is exposed to a lot of abrasive wear during operation, the at least one radially upper part 120 should preferably be covered to a larger extend compared to the at least one radially lower part 118, which is also illustrated in the figures of this disclosure. Preferably, the second type of wear protection liner elements 124 is arranged in a closer pattern compared to the pattern of the first type of wear protection liner elements 122. The arrangement of the first and the second type of wear protection liner elements 122, 124 is discussed in further detail in connection with FIG. 3A.

(30) Referring back to FIG. 2A, the grinding assembly 200 comprises one grinding roll 100 as discussed in connection with FIG. 1, herein referred to the first grinding roll 202. The first grinding roll 202 comprises one flange 112 attached to the first end 108 of the roll body 102 and one flange 112 attached to the second end 110 of the roll body 102. The second grinding roll 204 in the grinding assembly 200 is similar to the grinding roll 100 discussed in connection with FIG. 1 expect that there are no flange(s) 112 attached to the roll body 102.

(31) Further to what have been discussed above, a second surface 208 of the flange 112 is illustrated. The flanges 112 are arranged with nut and bolt arrangement 210 for attaching the flange 112 to the roll body 102. It should be noted that other attaching arrangement may be used as well.

(32) With reference to FIG. 2B, the grinding assembly 200 comprises two grinding rolls 100 as discussed in connection with FIG. 1. The first grinding roll 202 comprises one flange 112 attached to the second end 110 of the roll body 102, and the second grinding roll 204 comprises one flange 112 attached to the first end 108 of the roll body 102.

(33) FIG. 3A-C illustrates one flange segment 130 for forming the flange 112 from different point of views. FIG. 3A further illustrates a front view of the flange segment 130. FIG. 3B-C illustrates a cross section of the flange segment 130. The flange segment 130 is in line with, and has the same features as, the flange 112 that has been discussed above in connection with FIGS. 1, 2A-B and 5. FIG. 3A-C also illustrates the first type of wear protection liner elements 122 and the second type of wear protection liner elements 124 in further detail.

(34) As best illustrated in FIG. 3A, the first type of wear protection liner elements 122 is arranged as a mosaic pattern on the at least one radially lower part 118 of the flange segment 130. However, it should be noted that the first type of wear protection liner elements 122 may be arranged in any suitable pattern in order to withstand the axial force during operation of the grinding assembly 200, 500. According to one non-limiting example, the first type of wear protection liner elements 122 may comprise studs arranged in recesses provided in the at least one radially lower part 118 of the flange segment 130. Thus, the first type of wear protection liner elements 122 may be arranged in the similar way as on the cylindrical outer surface 104 of the roll body 102 discussed in connection with FIG. 1. The second type of wear protection liner elements 124 comprises tile plates arranged in a close pattern along at least one radially upper part 120 adjacent the outer edge 114 of the flange 112. Preferably, the tile plates are removably arranged along the at least one radially upper part 120 such that the tile plates may be replaced when worn in order to increase the life of the flange segment 130.

(35) Each flange segment 130 further comprises a section 304 arranged to be aligned with the first 108 and/or second end 110 of the roll body 102. This section comprises holes 302. The holes 302 may be aligned with corresponding holes in the roll body 102, which holes are arranged along the periphery of the first 108 and/or the second end 110 of the roll body 102. In this way the flange 112 may be attached in a simple and secure way. These holes 302 may be configured to receive a bolt, screw, or the like in order to attach the flange 112 to the roll body 102. Preferably, the holes 302 are pre-drilled holes in order to attach the flange 112 in an easy way. Obviously, other fastening means than bolting are conceivable.

(36) Further to what have been discussed above, FIG. 3B illustrates an elastic shim 306. The elastic shim 306 is arranged between the second type of wear protection liner elements 124 and the flange 112. The elastic shim 306 is arranged to reduce impact on the flange 112 during skewing events and thereby also increase the life of the flange 112. According to one non-limiting example, the elastic shim 306 may comprise a rubber mat. Preferably, the elastic shim 306 slide into place for the best fitting. Preferably, the elastic shim is arranged between the second type of wear protection liner elements 124 and the flange 112 by using a bolt and nut arrangement or the like.

(37) FIG. 3C illustrates a similar view as FIG. 3B but herein, without the second type of wear protection liner elements 124 such that the elastic shim 306 is shown in a better view. The elastic shim 306 may be arranged from a plurality of elastic shim segments as illustrated in the figure. However, it should be noted that the elastic shim 306 may be arranged as one single unitary section as well. The elastic shim 306 comprises one or more holes 308. The holes 308 are arranged to attach the elastic shim 306 to the flange 112 in a simple and secure way. These holes 308 may be configured to receive a bolt, screw, or the like in order to attach the elastic shim 306 to the flange 112. Preferably, the holes 308 are pre-drilled holes in order to attach the elastic shim in an easy way.

(38) With reference to FIG. 4A-B and according to another non-limiting example, the elastic shim 306 may comprise a spring assembly 402 in order to facilitate the similar provision, namely, to reduce the impact on the flange 112 during skewing events. The spring assembly 402 is arranged between the second type of wear protection liner elements 124 and the flange 112. Although four springs are illustrated for the spring assembly 402 in FIG. 4A-B, it should be noted that any number of springs may be used for the spring assembly 402. Preferably, the second type of wear protection liner elements 124 is slided into place and thereafter, the spring assembly 402 is installed from the second surface 208 of the flange segment 130 as illustrated. A locking plate 408 is arranged on the second surface 208, outside the spring assembly 402, in order to keep the spring assembly 402 in place. It is further illustrated a nut and bolt arrangement 404, 406 for attaching the second type of wear protection liner elements 124 to the flange 112, which has been discussed above.

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

(40) For instance, the at least one radially upper and lower parts of the first surface of the flange may be of any suitable size and shape depending on the material to be comminution and on the type of grinding assembly that is used. The arrangement of the elastic shim may also vary depending on the grinding assembly.