FEED ROLLS HAVING FLUTE ASSEMBLIES OF MATINGLY ENGAGEABLE MOUNTS AND FLUTE INSERT ELEMENTS

Abstract

A feed roll comprises a roll having a rotary axis, flutes fixed on the roll, mounts fixed on the roll between the flutes, each mount having a seat spaced apart from the outer surface of the roll and replaceable flute elements detachably and matingly engaged in the seats of respective mounts and extending outward beyond the mounts. The replaceable flute insert element comprises an elongated plate body having an inner longitudinal edge, an outer longitudinal edge, and a backing face extending between the inner longitudinal edge and the outer longitudinal edge and the inner longitudinal edge and the backing face configured to matingly engage the seat of the mount. The flute insert element further comprises the outer longitudinal edge being formed with a traction element and the plate body having a plurality of bolt holes therethrough for registering with the bolt holes of the mount element when the plate body and the seat are matingly engaged.

Claims

1. A replaceable flute element for a feed roll, the flute element comprising: a unitary elongated plate body having an inner longitudinal edge, an outer longitudinal edge, and a flat backing face extending between the inner and outer longitudinal edges, the inner longitudinal edge extending substantially perpendicular to the backing face for matingly engaging in a seat of a corresponding mount on the feed roll; the plate body having first and second ends and being tapered such that a distance between the inner longitudinal edge and the outer longitudinal edge is smaller at the first end of the plate body than at the second end of the plate body; the outer longitudinal edge being formed with a traction element configured to grip an outer surface of a log; the plate body having a plurality of bolt holes therethrough for passing bolts therethrough to secure the plate body to the mount; and the inner longitudinal edge is formed with one or more recesses configured to engage one or more lugs of the corresponding mount, wherein the one or more recesses each have opposing edges that extend substantially perpendicularly to the inner longitudinal edge toward the outer longitudinal edge.

2. The replaceable flute element according to claim 1 wherein the inner longitudinal edge is arcuate.

3. The replaceable flute element according to claim 2 wherein outside of the recesses the inner longitudinal edge is has a smooth continuous curvature along its length.

4. The replaceable flute element according to claim 3 wherein the inner longitudinal edge comprises three face portions separated by two of the recesses.

5. The replaceable flute element according to claim 4 wherein the three face portions are substantially equal in length.

6. The replaceable flute element according to claim 5 wherein the traction element comprises serrated teeth disposed along the arcuate outer longitudinal edge.

7. The replaceable flute element according to claim 6 wherein the serrated teeth are progressively larger in depth and width from the first end of the plate body to the second end of the plate body.

8. The replaceable flute element according to claim 7 wherein the serrated teeth are asymmetrical and sides of the serrated teeth facing toward the first end of the plate body are steeper than sides of the serrated teeth facing toward the second end of the plate body.

9. The replaceable flute element according to claim 7 wherein the outer longitudinal edge is arcuate.

10. The replaceable flute element according to claim 5 wherein each of the recesses is symmetrical around a centerline that is parallel to the second end of the plate body.

11. The replaceable flute element according to claim 10 wherein corners between the inner longitudinal edge and the at least one recess are smoothly radiused.

12. The replaceable flute element according to claim 7 wherein the first and second ends of the plate body are straight.

13. The replaceable flute element according to claim 12 wherein corners between the inner longitudinal edge and the first and second ends of the plate body of the replaceable flute element are smoothly radiused.

14. The replaceable flute element according to claim 12 wherein the first and second ends of the plate body are parallel to one another.

15. The replaceable flute element according to claim 1 wherein each of the recesses is symmetrical around a centerline that is parallel to the second end of the plate body.

16. The replaceable flute element according to claim 1 wherein corners between the inner longitudinal edge and the at least one recess are smoothly radiused.

17. The replaceable flute element according to claim 5 wherein the traction element comprises hardfacing.

18. The replaceable flute element according to claim 1 wherein each of the one or more recesses crosses a line extending between centers of two of the bolt holes that are located on either side of the recess.

19. The replaceable flute element according to claim 4 wherein each of the two of the recesses crosses a line extending between centers of two of the bolt holes that are located on either side of the recess.

20. The replaceable flute element according to claim 1 wherein the traction element comprises a member that is brazed to the plate body.

21. A set comprising right and left replaceable flute elements according to claim 1 wherein the first and second replaceable flute elements are mirror images of one another.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In drawings which illustrate embodiments of the invention wherein similar characters of reference denote corresponding parts in each view,

[0028] FIG. 1 is a perspective view of a feed roll according to an example embodiment.

[0029] FIG. 2 is a perspective view of a flute assembly according to an example embodiment.

[0030] FIG. 3A is a perspective view of a flute insert element according to an example embodiment.

[0031] FIG. 3B is a different perspective view of the flute insert element shown in FIG. 3A.

[0032] FIG. 4A is a perspective view of a mount according to an example embodiment.

[0033] FIG. 4B is a different perspective view of the mount shown in FIG. 4A.

[0034] FIG. 5 is an elevation view of the flute insert element shown in FIG. 2.

[0035] FIG. 6 is an elevation view of the mount shown in FIG. 2.

DETAILED DESCRIPTION

[0036] Throughout the following description specific details are set forth in order to provide a more thorough understanding to persons skilled in the art. However, well known elements may not have been shown or described in detail in order to avoid unnecessarily obscuring the disclosure. Accordingly, the description and drawings are to be regarded in an illustrative, rather than a restrictive, sense.

[0037] FIG. 1 is a perspective view of a feed roll 10 according to an example embodiment. Feed roll 10 comprises a cylindrical body 20, which may consist of a length of steel pipe. Inside cylindrical body 20, and not visible in the drawings, is an annular flange provided with holes for receiving bolts to secure the flange to a driven hub. When driven, feed roll 10 rotates about its longitudinal axis.

[0038] The outer surface of body 20 is provided with left and right sets of complementing, circumferentially distributed flutes 22R-22L. The flutes each comprise fixed outer flutes 24R-24L, and inner flute assemblies 26R-26L. In the illustrated example, the feed roll 10 has 12 flutes in each right and left set which are equally spaced apart by 30°.

[0039] The outer flutes 24R-24L are mirror images of one another and are positioned so that their inner and outer ends are displaced with respect to one another circumferentially of the roll as seen, for example, in FIG .1, and are welded in position. As can also be seen in FIG. 1 respective flute sections in each outer set have their inner ends directly opposite one another and are spaced apart equally from the longitudinal center of cylindrical body 20.

[0040] The flute assemblies 26R-26L are longitudinally between outer flutes 24R-24L, and are positioned so that their inner and outer ends are displaced with respect to one another circumferentially of the roll. Respective flute assemblies in each set have their inner ends directly opposite one another and are spaced apart equally from the longitudinal center of cylindrical body 20.

[0041] FIG. 2 is an elevation view of flute assembly 26L, shown isolation. Flute assembly 26L comprises a flute element 30 seated in a mount 40. Features of flute assembly 26L are described below with reference to FIG. 2, and FIG. 3A and FIG. 3B, which show different perspective views of flute element 30, and FIG. 4A and FIG. 4B, which show different perspective views of mount 40, and also FIG. 5 and FIG. 6, which show elevation views of, respectively, flute element 30 and mount 40.

[0042] Mount 40 comprises a base portion 42 and a backing portion 44, located outward of base portion 42, that together define a seat 46. More specifically, base portion 42 has an outer face 52, which comprises face portions 52A, 52B and 52C separated by lugs 54A and 54B, which together with the adjoining mounting face 56 of backing portion 44 define seat 46. In the illustrated embodiment, outer face 52 of base portion 42 meets mounting face 56 of backing portion 44 at a 90 degree angle. In other embodiments, this angle between outer face 52 and mounting face 56 may be less than 90 degrees.

[0043] In the illustrated embodiment, mount 40 also comprises inner stop 57 and outer stop 58, both of which further define seat 46. Outer stop 58 is substantially the same width and depth as the inner end of the adjacent outer flute element 24L. Outer stop 58 may be joined to the inner end of outer flute element 24L, such as by welding, for example. A plurality of substantially equally spaced boreholes 48A, 48B and 48C are defined through backing portion 44 between inner stop 57 and outer stop 58. In some embodiments only a single borehole is provided through backing portion 44.

[0044] It will be observed that mount 40 has an arcuate inner edge 60 that is spaced apart from and radially inward of seat 46. More specifically, arcuate edge 60 is spaced apart from and generally opposite outer face 52 of base portion 42. As seen in FIG. 1, arcuate edge 60 abuts the outer surface of cylindrical body 20. The arcuate configuration of edge 60 provides for close contact between base portion 42 of mount 40 and the outer surface of cylindrical body 20. The arcuate configuration of edge 60 also facilitates affixation, such as by welding, of mount 40 onto outer surface of cylindrical body 20. In some embodiments, edge 60 comprises a compound curve, which may facilitate continuous butting contact between base portion 42 of mount 40 and the outer surface of cylindrical body 20.

[0045] Arcuate inner edge 60 has a more inwardly located center and smaller radius than outer arcuate edge 62 of mount 40. As a result, mount 40 tapers from its outer end 64 to its inner end 66. As can be seen in FIG. 4 and FIG. 6, outer end 64 of mount 40 is wider (“higher” in FIG. 1) than inner end 66.

[0046] As best seen in FIG. 1, the inner end 66 of mount 40 is beveled to provide an inner edge 66A. The beveled inner edge 66A is relatively more closely aligned with the direction of rotational motion of feed roll 10 as compared with an edge perpendicular to the major axis of mount 40. In the illustrated embodiment, the beveled inner edge 66A is generally parallel to the cross-section of cylindrical body 20 (i.e., generally orthogonal to the rotary axis of feed roll 10), such that facing inner edges of complementing mounts are parallel to one another. This configuration facilitates a welded connection between the facing inner edges of complementing mounts on feed roll 10.

[0047] As shown in the drawings, flute element 30 comprises an elongated plate body 31 that is shaped for mating engagement with seat 46 of mount 40. In particular, body 31 comprises an inner face 32, which comprises three face portions separated by recesses 34A and 34B, and a backing face 36 that extends outwardly from inner face 32. Inner face 32 is complementary to outer face 52 of mount 40; more specifically, the curvature of inner face 32 matches the curvature of outer face 52. Backing face 36 is complementary to mounting face 56 of mount 40; more specifically, backing face 36 and mounting face 56 are both planar. Recesses 34A and 34B are formed on inner face 32 to receive lugs 54A and 54B of mount 40. Inner face 32 and backing face 36 form an angle that is complementary to the angle formed between outer face 52 and mounting face 56 that define seat 46. The described configuration provides for mating engagement of flute element 30 with seat 46 wherein inner face 32 abuts outer face 52 and backing face 34 abuts mounting face 56.

[0048] In the illustrated embodiment, plate body 31 has inner end 77 and outer end 78, and is dimensioned so that inner end 77 abuts inner stop 57 and outer end 78 abuts outer stop 58 when flute element 30 is matingly engaged with seat 46 of mount 40.

[0049] In the illustrated embodiment, the mating engagement of flute element 30 in seat 46 of mount 40 constrains the movement of flute element 30 in three orthogonal directions. In particular, base portion 42 inhibits travel of flute element 30 in a radially inward direction, backing portion 44 inhibits travel of flute element 30 in the direction opposite the rotation of feed roll 10, and stops 57 and 58 inhibit travel of flute 30 in the directions parallel to the longitudinal axis of feed roll 10. The mating engagement of lugs 54A and 54B in recesses 34A and 34B provides additional constraint on the movement of flute element 30 relative to mount 40.

[0050] The butting of inner face 32 of flute element 30 against outer face 52 of mount 40, which is provided by the mating engagement of flute element 30 in seat 46 of mount 40, provides a connection for transmitting radially-directed forces acting on flute element 30 though mount 40 to cylindrical body 20. Registration of boreholes 48A, 48B and 48C through mount 40 with corresponding boreholes 38A, 38B and 38C through flute element 30 is not affected by variations in the relative spatial arrangement of mount 40 and cylindrical body 20. As a result, there is no need to oversize the boreholes defined in mount 40 (or flute element 30) in order to both assure registration of boreholes 48A, 48B and 48C with boreholes 38A, 38B and 38C and provide force transmission from flute element 30 to cylindrical body 20.

[0051] Though omitted from the drawings so as not to obscure the disclosure, flute 30 may be detachably connected to mount 40 using bolts through boreholes 48A, 48B and 48C and boreholes 38A, 38B and 38C. Threads may be provided in boreholes 38A, 38B, 38C, 48A, 48B and 48C, and the threads formed in corresponding boreholes (i.e., those that are registered when flute element 30 is matingly engaged with mount 40) may be continuous. Alternatively, the threads in corresponding boreholes may be matched so that even if the thread is not continuous a single threaded bolt will mate in the registered boreholes of flute element 30 and mount 40 when flute element 30 is matingly engaged with seat 46 of mount 40. In some embodiment, threads are provided only in boreholes 48A, 48B, and 48C.

[0052] Serrated teeth 70 are provided along the outer arcuate edge 72 of flute element 30. Teeth 70, which may have their leading and trailing edges beveled, provide traction against logs fed into feed roller 10. The teeth are preferably progressively larger in depth and width from the inner end of 77 of each flute insert element to the wider outer end 78. In the illustrated embodiment, teeth 70 comprise high chromium steel, and are joined to plate body 31 by thermal brazing. In other embodiments, traction elements other than serrated teeth, such as conical spikes or carbide hardfacing, for example, may be used.

[0053] It will be noted that the flute assemblies 26R-26L are positioned relative to the outer flutes 24R-24L so that the outer ends of the mounts are generally aligned with the inner ends of the outer flutes. The flute elements are made sufficiently wider than the mounts to expose the teeth radially outward beyond the outer edge 62 of the mated mount.

[0054] It will be appreciated that the complementary right-sided flute elements and mounts are mirror images of the left-sided flute elements and mounts described above. The mounts 40 are positioned so that their inner and outer ends 66, 64 are displaced with respect to one another circumferentially of the roll as seen, for example, in FIG. 1.

[0055] Where a component is referred to above, unless otherwise indicated, reference to that component (including a reference to “means”) should be interpreted as including as equivalents of that component any component which performs the function of the described component (i.e., that is functionally equivalent), including components which are not structurally equivalent to the disclosed structure which performs the function in the illustrated exemplary embodiments of the invention.

[0056] As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof.

[0057] For example: [0058] Though in the described example embodiments lugs 54A and 54B extend outward from base portion 42 of mount 40, in other embodiments, recesses may be formed in base portion 42 in place of lugs, and complementary lugs provided on flute element 30 in place of recesses 34A and 34B. Other complementary features between based portion 42 of mount 40 and plate body 31 of flute element 30 are also possible. [0059] Though in the drawings flute element 30 is shown as extending traversely beyond mount 40, flute element 30 may be made thinner so as to be flush with mount 40, or thinner still, so as to be recessed relative to mount 40 when matingly engaged in seat 46. [0060] Complementary pairs of mounts 40 may be joined at inner edges 66A, such as by a weld, or may be axially spaced apart as shown. [0061] Mount 40 is illustrated as being made from a single piece, such as by machining or casting, such that base portion 42 is continuous with inner stop 57 and outer stop 58, and all of these elements are of a piece with backing portion 44. In other embodiments, base portion 42 may not be continuous with either or both of inner stop 57 and outer stop 58, and these elements may be separately formed and affixed to backing portion 44. [0062] In the illustrated embodiment, base portion 42, inner stop 57 and outer stop 58 extend the full length, respectively of inner edge 60, inner end 66, and outer end 64. In other embodiments base portion 42 may not extend the full length of inner edge 60, inner stop 57 may not extend the full length of inner end 66, and outer stop 58 may not extend the full length of outer end 64.

[0063] While a number of exemplary aspects and embodiments have been discussed above, those of skill in the art will recognize certain modifications, permutations, additions and sub-combinations thereof. It is therefore intended that the following appended claims and claims hereafter introduced are interpreted to include all such modifications, permutations, additions and sub-combinations as are within their true spirit and scope.

[0064] While specific embodiments of the invention have been described and illustrated, such embodiments should be considered illustrative of the invention only and not as limiting the invention as construed in accordance with the accompanying claims.