Abstract
A set for mechanical processing suspended fibrous material includes a die plate having receiving openings in a predefined arrangement for insertion of blade-shaped processing elements which jut out on a process side and are flowed onto by the fibrous material. The blade-shaped processing elements have each a plurality of foot regions in longitudinally spaced-apart relation, which pass through the die plate and jut out from the die plate on a process-distal. At least some of the foot regions of the processing elements reach into associated receiving grooves of a base plate on the process-distal side. As an alternative, transverse stiffening elements are arranged substantially orthogonally in the longitudinal direction of the processing elements such that the transverse stiffening elements stabilize the foot regions of the processing elements on the process-distal side.
Claims
1. A set for the mechanical processing of suspended fibrous material in a refiner, comprising a die plate having openings in a predetermined arrangement, said die plate defining a process-proximal side flowed upon by the fibrous material and a process-distal side; blade-shaped processing elements arranged on the process-proximal side, each processing element having a first longitudinal side facing the fibrous material and a plurality of foot regions arranged in spaced-apart relationship in a longitudinal direction on a second longitudinal side of the processing element facing away from the first longitudinal side, with the foot regions inserted from the process-proximal side through corresponding openings of the die plate so as to jut out on the process-distal side; and strip-shaped transverse stiffening elements arranged on the process-distal side orthogonal to the longitudinal direction and protruding from the process-distal side of the die plate, with the strip-shaped transverse stiffening elements traversing the foot regions of the blade-shaped processing elements and forming with the foot regions of the blade-shaped processing elements an interlocking arrangement which stabilizes the foot regions of the blade-shaped processing elements on the process-distal side.
2. The set of claim 1, wherein the strip-shaped transverse stiffening elements traverse the foot regions of the blade-shaped processing elements and hold and support the blade-shaped processing elements in spaced-apart relation.
3. The set of claim 1, wherein the strip-shaped transverse stiffening elements jut out beyond the die plate on the process-proximal side and support the blade-shaped processing elements on the process-proximal side.
4. The set of claim 1, wherein the blade-shaped processing elements together with the die plate and the strip-shaped traverse stiffening elements define an assembly which is cast with polymer on the process-distal side.
5. The set of claim 1, wherein a residence time of the fibrous material between adjacent blade-shaped processing elements is controllable in dependence on a number and an arrangement of the strip-shaped transverse stiffening elements.
6. The set of claim 1, wherein the blade-shaped processing elements protrude from the process-proximal side by between 6 and 12 mm.
7. The set of claim 1, wherein the blade-shaped processing elements protrude from the process-proximal side by between 8 and 10 mm.
8. The set of claim 1, wherein the blade-shaped processing elements have a width which is 1 to 6 mm.
9. The set of claim 1, wherein the blade-shaped processing elements have a width which is 1.5 to 2.5 mm.
10. The set of claim 1, wherein the blade-shaped processing elements define there between a channel having a width of 1.5 to 6 mm.
11. The set of claim 1, wherein the blade-shaped processing elements define there between a channel having a width of 1.8 to 2.5 mm.
12. The set of claim 1, further comprising bushings attached in the openings of the die plate and configured for receiving fastening screws.
13. The set of claim 12, wherein the bushings are connected to the die plate by a material joint or by a combination of material joint and form fit.
14. The set of claim 13, wherein the material joint is implemented by a welded connection, soldered connection and/or adhesive bond.
15. The set of claim 12, wherein the bushings have each an anti-rotation mechanism.
16. The set of claim 15, wherein the anti-rotation mechanism is formed by a polygon connection or polygonal shape.
17. The set of claim 1, wherein the strip-shaped transverse stiffening elements are physically combined into a cohesive structure.
Description
BRIEF DESCRIPTION OF THE DRAWING
(1) Further details, features, and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings, without any limiting character. It is shown in:
(2) FIG. 1 a perspective overall view of an embodiment of a set as an application example of the invention,
(3) FIG. 2 a perspective view of the configuration of a set, in which the dam-like transverse stiffening elements protrude on the process-proximal side and support the blade-shaped processing elements in spaced-apart relation,
(4) FIG. 3 a perspective view of the arrangement according to FIG. 2 with an embodiment variant which has an additional base plate connected to the perforated plate,
(5) FIG. 4 a schematic arrangement of a configuration of a set according to the invention, in which both the blade-shaped processing elements and the dam-like transverse stiffening elements protrude beyond the die plate on the process-proximal side and on the process-distal side,
(6) FIG. 5 a perspective view of the arrangement of FIG. 4 in viewing direction onto the process-distal side of the set,
(7) FIG. 6 a perspective view of a blade-shaped processing element as single-piece representation,
(8) FIG. 7 a perspective view of a dam-like transverse stiffening element as single-piece representation,
(9) FIG. 8 a perspective view of an assembly of blade-shaped processing elements and dam-like transverse stiffening elements,
(10) FIG. 9 a schematic perspective view, in which, for sake of clarity, the blade-shaped processing elements are only partially inserted into the die plate, while the dam-like transverse stiffening elements are readily apparent in their inserted state,
(11) FIG. 10 an embodiment of a bushing for the force introduction of fastening screws,
(12) FIG. 11 a perspective view of an embodiment variant of a bushing for the force introduction of fastening screws,
(13) FIG. 12 a schematic perspective view of an alternative embodiment in which, for sake of clarity, the blade-shaped processing elements are only partially inserted into the die plate,
(14) FIG. 13 a schematic perspective cutaway view of a perforated plate in the embodiment variant according to FIG. 12, and
(15) FIG. 14 a perspective view of a blade-shaped processing element as single-piece representation for the embodiment variant of a set according to FIGS. 12 to 14.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
(16) In the figures of the drawing, same or similar parts are designated by the same reference numerals.
(17) FIG. 1 shows an overall view of an exemplary embodiment of a set, generally designated by 1, which is installed on a not-shown grinding machine, a so-called refiner, and used for grinding of suspended fibrous material as well as for dispersing impurities and fibers as well as for stripping, i.e. the dissolution of fiber conglomerates. The set 1 shown in FIG. 1 by way of a top view, includes a die plate or perforated plate 2, blade-shaped processing elements 3, and dam-like transverse stiffening elements 4. In addition, FIG. 1 shows openings 5 in the die plate 2 for insertion of bushings 6 for force introduction of fastening screws. Further, in the exemplary embodiment shown in FIG. 1, a cured cast mass layer 7 is shown for stable realization of the assembly of die plate 2, blade-shaped processing elements 3, and dam-like traverse stiffening elements 4, and is preferably formed from a polymer to provide an adhesive bond as material joint of die plate 2, blade-shaped processing elements 3 and dam-like transverse stiffening elements 4.
(18) An embodiment is shown with reference to FIGS. 2 and 3, wherein the dam-like transverse stiffening elements 4, like the blade-shaped processing elements 3, jut out only on the process-proximal side. In FIG. 3, instead of the cured cast mass layer 7 according to FIG. 1, a reinforcing plate or base plate 8 is arranged, into which at least a number of the foot regions of the processing elements 3 extend into associated receiving grooves of the base plate 8.
(19) An embodiment variant of a set 1′ is shown with reference to FIGS. 4 to 9 and includes a die plate 2, blade-shaped processing elements 3, and dam-like transverse stiffening elements 4. As can be seen from FIGS. 4 and 5, the dam-like transverse stiffening elements 4 and also the blade-shaped processing elements 3 jut out from the die plate 2 on the process-distal side. Thus, foot regions 10 of the blade-shaped processing elements and foot regions 11 of the dam-like transverse stiffening elements 4 protrude on the process-distal side. In particular, it can be seen from FIG. 5 that these protruding foot regions 10 and 11 of the blade-shaped processing elements 3 and the dam-like transverse stiffening elements are form-fittingly joined together on the rear side of the die plate 2 to form a union, with the transverse stiffening elements 4 traversing the foot regions 10 of the processing elements 3. Furthermore, it can be seen from both the preceding figures and this FIG. 5 that the dam-shaped transverse stiffening elements 4 are physically held together to form a linked structure. The dam-like transverse stiffening elements 4 are designed strip-shaped and include a plurality of regions which pass through the respective openings in the die plate 2. These receiving openings in the die plate 2 are designated by 12 in the figures of the drawing.
(20) For sake of clarity, with reference to FIGS. 6 to 8, the blade-shaped processing element 3 and a dam-like transverse stiffening element 4 are illustrated as single-piece representation. FIG. 8 illustrates the interlocking arrangement of a blade-shaped processing element 3 and plurality of strip-shaped, dam-like transverse stiffening elements 4, illustrating in particular the interlocking plug-in connection. In the figures of the drawings, the process-proximal side of the sets 1, 1′ is designated by 13 and the process-distal side by 14.
(21) FIG. 9 shows a perspective view of a partially assembled set 1′ for clarifying the assembly process, for example.
(22) Finally, FIGS. 10 and 11 show preferred embodiments of bushings 6 for force introduction of fastening screws into openings 5 of the die plate 2, as can be seen in FIG. 1. The bushing 6 according to FIG. 10 is designed such as to be connectable to the die plate 2 by a material joint or by a combination of material joint and form-fitting connection. These may involve, for example, welded connections, soldered connections and/or adhesive bonds.
(23) In the embodiment of the bushing 6′ according to FIG. 11, an anti-rotation mechanism 15 is additionally shown, which is designed in the form of a polygon connection 16, for example.
(24) An embodiment variant or an alternative embodiment of a set 1″ is schematically shown and explained with reference to FIGS. 12 to 14. As becomes apparent from FIG. 13, the die plate or perforated plate 2 has receiving openings 12′, which have alternating projections 17 that jut out in the radial direction. As can be seen from FIG. 12, the blade-shaped processing elements 3′ are inserted into the receiving openings 12′ such that the longitudinally spaced-apart foot regions 10 of the blade-shaped processing elements 3′ are alternately in contact with the respective radial projections 17 in the receiving openings 12′. In this way, on one hand, an alignment of the blade-shaped processing elements 3′ inserted into the die plate 2 is established, and, on the other hand, these are also clamped in a suitable manner by the projections 17 that are alternatingly oriented in a radial direction to stabilize the blade-shaped processing elements 3′.
(25) FIG. 14 shows a blade-shaped processing element 3′ by way of single-piece representation, which according to FIG. 12 is inserted into the predetermined receiving openings 12′ of the perforated plate 2 or die plate 2.
(26) In the embodiment variant and preferred embodiment of the set 1′, 2 according to FIGS. 12 to 14, no transverse stiffening elements are provided, in deviation from the embodiments explained above, but rather the longitudinally spaced foot regions 10 of the blade-shaped processing elements 3′ run through the die plate 2 and are either stabilized on the process-distal side 14 either by extending into the receiving grooves 12′ of the base plate 8 on the process-distal side 14, or by casting them with: polymer on the process-distal side 14. Thanks to the stabilization on the process-distal side 14 and the additional fixing with the aid of the radial projections 17 in the receiving openings 12′ of the die plate 2, a sufficient stabilization of the blade-shaped processing elements 3′ can be reliably and securely maintained in conjunction with the perforated plate 2 and an optionally provided base plate or casting with polymer.
(27) The invention is not limited to the above-described details of the preferred embodiments but numerous changes and modifications are possible, which the artisan can contemplate, if need be, without departing from the spirit of the invention. For example, blade-shaped processing elements 3 and dam-like transverse stiffening elements 4 can be combined with one another, which partly jut out on the foot region 10 for the die plate 2 on the process-distal side 14, and those shown in FIGS. 2 and 3. The blade-shaped processing elements 3, 3′ can also be provided in different arrangements and orientations relative to one another. The same also applies, of course, to the dam-like traverse stiffening elements 4.
(28) An essential feature of the invention is that the assembly of die plate 2, blade-shaped processing elements 3, 3′ and, optionally, dam-like transverse stiffening elements 4 ensures effective mutual stiffening, which is due to the lattice-like structure of the assembly according to the invention or the anchoring of at least a number of the longitudinally spaced foot regions 10 of the blade-shaped processing elements 3, 3′ in an additional base plate. Furthermore, when the dam-like transverse stiffening elements 4 are physically held together into a linked structure, installation of such a set 1, 1′ is facilitated. In addition, the transverse stiffening elements 4 also have sufficient inherent stiffness. By intermeshing blade-shaped processing elements 3 and dam-like transverse stiffening elements 4, a surprisingly good inherent stiffness is obtained in the set 1, 1′ according to the invention, even in the case that the blade-shaped processing elements 3 are designed very slim, i.e. have a slight thickness dimension in relation to the length and height dimensions.
