EP1961532A1 - Toothed roller - Google Patents

Abstract

A roof mounted solar array is attached by a number of fittings, each consisting of a rail and a hammerhead bolt whose head locates inverted in a rail profile groove. The groove has an undercut section that engages with the screw head. The bolt is retained by a one-piece spring.

Description

The invention relates to a corrugating roll, in particular for a drum chipper, comprising (a) a base body extending in an axial direction and (b) a plurality of tooth segments releasably secured to the base body, each having at least two teeth in a circumferential direction of the base body (c ) wherein the toothed segments in the circumferential direction have at least as many teeth as in the axial direction.

Ripple rollers are used as feed rollers in drum chippers and serve to feed introduced by a feed chute branches, branches or whole logs a chopping device, which then crushes them. Such corrugating rolls are arranged for safety reasons on protected and therefore difficult to reach places of the drum chipper.

Corrugated rolls are subject to considerable wear and must therefore be replaced regularly. Since the corrugating rolls are arranged in places that are difficult to access, replacement is time-consuming, tedious and danger-prone.

Known corrugating rolls are therefore made of two half-shells, which are screwed together. To replace a corrugating roller, the two half-shells are unscrewed and can then be removed and replaced individually through the feed chute.

A disadvantage of such corrugating rolls is their high weight. This results in a time-consuming and exhausting assembly. Another disadvantage is the high cost of materials for the two half shells and the resulting inconvenience during storage and transport.

From the US Pat. No. 6,481,471 B1 a generic corrugating roll is known in which a dovetail guide groove is provided, into which a plurality of individual tooth segments is threaded. The last tooth segment is welded to the base body. To replace a toothed segment, the spot weld joint is loosened and the tooth segments are threaded out of the dovetail groove again. A disadvantage of this corrugating roller is that an exchange of tooth segments is not possible through a narrow opening, such as through a feed opening of the drum chipper.

From the US 4 901 778 a corrugating roll is known, in which the toothed segments are screwed in the axial direction. A disadvantage of this corrugating roller is that the toothed segments already have to be completely replaced when only a small axial section is worn.

The invention has for its object to provide a corrugating roll, the tooth segments are easily and quickly interchangeable, even if the drum roller is accessible only through a narrow feed opening of the drum chipper.

The invention solves the problem by a generic corrugating roll, in which the toothed segments are attached individually exchangeable.

An advantage of the invention is that it allows quick maintenance. Tooth segments, which have at least as many teeth in the circumferential direction as in the axial direction Direction, are produced with low weight and can therefore be handled easily.

It is also advantageous that due to the invention, only those parts of a corrugating roll can be replaced, in which a wear this requires. It has been found that teeth of the corrugating roll wear very quickly, which are arranged close to a center of the area which is corrugated (corrugation area). In the middle of the corrugated area arranged tooth segments must therefore be replaced more frequently.

Another advantage is that toothed segments for use in highly wear-loaded areas of the corrugating roll can be made particularly wear resistant. Such a wear-resistant design is complicated and expensive. The invention makes it possible to provide wear protection only where it is really necessary.

Another advantage is that said tooth segments are particularly firmly mounted on the body. When operating a corrugating roller in a drum chipper, the largest tangential forces occur in the circumferential direction on the toothed segments. The fact that the toothed segments have at least as many teeth in the circumferential direction as in the axial direction, it is achieved that the forces occurring in the circumferential direction can be particularly effectively absorbed by fasteners with which the toothed segments are attached to the body.

The advantages of the invention are reduced by a slightly increased assembly costs in the initial production of the corrugating roll. However, it has been found that this disadvantage is negligible contrary to a prejudice prevalent in the art.

In the context of the present description, a corrugating roll is understood in particular to mean a roll on which a plurality of rows of teeth arranged in the circumferential direction are present. It can also speak of a toothed roller become. The corrugating roll is preferably designed for use in a wood chipper and can therefore also be referred to as a wood chipper corrugating roll.

A toothed segment is understood in particular to mean a component which can be positively connected to the base body and which has at least two teeth arranged in the circumferential direction on its side facing away from the base body in the mounted state. It is not necessary that the teeth are arranged strictly in the circumferential direction. Rather, it is sufficient that the teeth are arranged in a direction which is at an angle to the axial direction. The teeth can therefore also be offset from one another in the circumferential direction.

In particular, a tooth is generally understood to mean a projection which is suitable for transmitting a feed force to the material to be conveyed by engaging material in wood or similar material to be conveyed. The shape of the teeth is limited only by this function. For example, the teeth may have the shape of a truncated pyramid, a truncated cone or a triangle with a tip pointing in the radial direction outside.

The fact that the toothed segments are fastened individually interchangeably means, in particular, that the toothed segments are fastened so that a single toothed segment can be removed without the remaining toothed segments having to be loosened. In other words, the tooth segments are individually accessible. That is, the tooth segments are mounted individually removable.

In a preferred embodiment, the toothed segment has less than three rows of teeth in the axial direction. Particularly preferably, the toothed segment has only one row of teeth in the axial direction. This ensures that the toothed segments are particularly easy and easy to replace.

Preferably, the tooth segments each extend over 1/8, 1/6 or 114 of the circumference of the corrugating roll. In this way, a particularly simple assembly of Tooth segments on the body allows. As a rule, the corrugating roll is arranged in the drum chopper such that only part of it is visible or accessible from outside through a feed chute. If the toothed segments each extend over 1/8, 1/6 or 1/4 of the circumference of the corrugating roll, the toothed segment can always be fully observed during assembly on the base body. This facilitates assembly and assembly control. But it is also possible that the toothed segments extend over a third or over half of the circumference of the corrugating roll.

Preferably, the toothed segments are screwed to the base body. This allows a particularly fast and secure fixation of the tooth segments on the body. Alternatively or additionally, the toothed segments can be connected to the base body via a positive connection, for example in the form of a groove. By such a form-fitting force acting in the circumferential direction are derived particularly effective, so that lower forces load on the screws.

Alternatively or additionally, the toothed segments are designed such that, when they are detachably fastened to the base body, they engage in one another in a form-fitting manner. This ensures that the toothed segments stabilize each other and a particularly strong connection of the toothed segments is achieved with the body.

In a preferred embodiment, the tooth segments of an axial height are made of the same material. By an axial height is meant the distance from one end of the corrugation region of the corrugating roll. When the corrugating roll is rotated about its longitudinal axis, all teeth of an axial height engage at the same axial position. Teeth of the same axial height usually have the same load. By providing the same material advantageously results in a substantially equal wear.

In a preferred embodiment, the corrugating roll comprises a first set of tooth segments and a second set of tooth segments, the first set being closer to an axial center of a corrugation region of the corrugating roll than the second set. Below the corrugation area of the corrugating roll is the area too understand, which is staffed with teeth. The axial center is the axial height into which the geometric center of gravity of the corrugation region falls. By providing at least a first set and a second set of tooth segments, it is possible to adapt the tooth segments of the first set to the higher wear load near the axial center of the corrugation region. It can also be provided three, four or five teeth.

In a particularly preferred embodiment, it is provided that the toothed segments of the first set are made of a harder material than those of the second set. Alternatively or additionally, the toothed segments of the first set are provided with a wear-reducing coating. Such measures lead to an elaborate production of the tooth segments and are therefore worthwhile only for particularly wear-loaded regions of the corrugating roll. So a high overall wear resistance of the corrugating roll is achieved with low production costs.

Figur 1

eine erfindungsgemäße Riffelwalze in einer perspektivischen Ansicht,

Figur 2

ein erfindungsgemäßes Zahnsegment zur Montage an der Riffelwalze gemäß Figur 1,

Figur 3

eine schematische Seitenansicht einer erfindungsgemäßen Riffelwalze, an deren Grundkörper ein Zahnsegment befestigt ist,

Figur 4

eine Seitenansicht einer erfindungsgemäßen Riffelwalze deren Umfang vollständig mit Zahnsegmenten besetzt ist und

Figur 5

eine Seitenansicht der Riffelwalze aus Figur 1.

In the following, an embodiment of the invention is explained in more detail with reference to the accompanying drawings. It shows

FIG. 1

a corrugating roll according to the invention in a perspective view,

FIG. 2

an inventive toothed segment for mounting on the corrugating roll according to FIG. 1 .

FIG. 3

a schematic side view of a corrugating roll according to the invention, on whose base a toothed segment is attached,

FIG. 4

a side view of a corrugating roll according to the invention whose circumference is fully occupied with tooth segments and

FIG. 5

a side view of the corrugating roller FIG. 1 ,

FIG. 1 shows a corrugating roller 10 according to the invention, which has a base body 12, with which it is attached to a drive shaft 14. The main body 12 extends in a predetermined by the drive shaft 14 axial direction, which is indicated by an arrow A. Perpendicular to the axial direction A is a radial direction, which is indicated by an arrow R, and around the axial direction A around a circumferential direction, which is indicated by a circular arc portion U.

In the axial direction A are a plurality of toothed segments 16.1 a, 16.1b, ... by means of respective associated screws 18a, 18b attached to the base body 12. Each of the toothed segments 16.1a, 16.1b, .. has on its base body 12 side facing a flat surface, so for example, the toothed segment 16.1 a has a flat surface 20.1a, with which it rests flat on the base body 12. The main body 12 has the shape of a regular hexagon in cross section and there are six tooth segments 16.ia with 1 ≤i≤6 screwed onto each of the side surfaces of the base body, so that the entire circumference of the base body 12 is covered with toothed segments.

There are therefore each six tooth segments 16.1a, 16.2a, 16.3a, 16.4a, 16.5a and 18.6a arranged at an axial height H. The fact that these toothed segments are arranged at the same axial height H means that they are arranged at the same physical height when the axial direction A is perpendicular (cf. FIG. 5 ). Thus, the aforementioned tooth segments 16.1a, 16.2a, ... 16.6a are all at an axial height H _a . In the same way are six tooth segments 16.1b, 16.2b ... 16.6b at an axial height H _b (see. FIG. 5 ).

As FIG. 2 shows, each toothed segment 16 has four teeth 22a, 22b, 22c, 22d, which have the shape of a triangle with a tip pointing in the radial direction R outside. In a front side 24 located in the circumferential direction U, the toothed segment 16 has a projection 26 which is designed to engage in a recess 28 of the toothed segment lying in the circumferential direction U.

The teeth 22a, 22b, 22c, 22d are arranged in the circumferential direction U in a row and the toothed segment 16 has only one row of teeth in the axial direction A.

FIG. 3 schematically shows a further embodiment of a corrugating roll 10 according to the invention, at the only one toothed segment 16 is shown screwed with a screw 18 for clarity. While at the in FIG. 2 shown toothed segment is a bore 30 adjacent to the outermost tooth 22d is introduced to secure the toothed segment 16 to the base body 12 is in the toothed segment 16 according to FIG. 3 the bore 30 is provided in the middle of the toothed segment. In its other properties, this is true in FIG. 3 shown toothed segment with the in FIG. 2 shown toothed segment match.

FIG. 4 shows a side view of another embodiment of a corrugating roll 10 according to the invention FIG. 4 shown corrugating roller 10, the toothed segments 16.1a, 16.1b, ... on its the base body 12 facing flat surface 20 each have a running in the axial direction A groove 32, each with a web 34 of the body 12 cooperate. As a result, a particularly firm hold of the toothed segments 16 on the base body 12 is achieved.

FIG. 5 shows a side view of the corrugating roller 10 after FIG. 1 , The region of the corrugating roll 10, which is covered with tooth segments 16, forms a corrugation region 36 of the corrugating roll 10. In the in FIG. 5 shown corrugating roller 10, the tooth segments of an axial height are made of the same material. For example, the toothed segments 16.1a, 16.2a, ... 16.6a of the axial height H _{a are} all made of hardened steel. It can be provided that toothed segments of a different axial height are made of a different material. For example, it is possible that the toothed segments 16.1b, 16.2b, ... 16.6b of the axial height H _b , which are all closer to an axial center M of the corrugation region 36, are made of a harder material than those of the axial one Height H _a belonging tooth segments

A method according to the invention is carried out by, for example, removing all of the toothed segments 16 from the base body 12 and discarding those toothed segments 16 worn to the point of unusability and replacing them with toothed segments 16 with less wear, for example new toothed segments. In a subsequent step, the toothed segments 16 are again mounted on the base body.

Due to the fact that the toothed segments have at least as many teeth in the circumferential direction as in the axial direction, individual toothed segments can be easily detached from the corrugating roller and replaced by individual new toothed segments.

LIST OF REFERENCE NUMBERS

10

corrugating roll

12

body

14

drive shaft

16

toothed segments

18

screw

20

flat surface

22

tooth

24

front

26

head Start

28

recess

30

drilling

32

groove

34

web

36

Riffel area

A

axial direction

R

radial direction

U

circumferentially

Claims (10)

Corrugating roller, in particular for a drum chipper, with (A) in a axial direction (A) extending base body (12) and (b) a plurality of tooth segments (16) which are detachably fastened to the base body and each have at least two teeth (22) in a circumferential direction (U) of the base body (12), (c) wherein the toothed segments (16) have at least as many teeth (22) in the circumferential direction (U) as in the axial direction (A), characterized in that the toothed segments (16) are fastened individually exchangeable. Corrugating roll according to claim 1, characterized in that the toothed segments (16) each extend over a fraction of a circumference of the corrugating roll (10), in particular over one-eighth, one-sixth or one-fourth of a circumference of the corrugating roll (10). Corrugated roller according to one of the preceding claims, characterized in that the toothed segments (16) in the axial direction (A) less than three rows of teeth (22). Corrugated roller according to claim 3, characterized in that the toothed segments (16) in the axial direction (A) have only one row of teeth. Corrugated roller according to one of the preceding claims, characterized in that the toothed segments (16) are screwed to the base body (12). Corrugated roller according to one of the preceding claims, characterized in that the toothed segments (16) of an axial height (H) are made of the same material. Corrugating roll according to one of the preceding claims, characterized in that the corrugating roll (10) has a first set of toothed segments and a second set of toothed segments, the first set closer to an axial center (M) of a corrugation region (36) of the corrugating roll (10). 10) is located as the second sentence. Corrugating roller according to claim 7, characterized in that the toothed segments (16) of the first set of another, in particular a harder, are made of material than that of the second set. Corrugated roller according to one of claims 7 or 8, characterized in that the toothed segments (16) of the first set are provided with a wear- reducing coating. Corrugating roller according to one of claims 7 to 9, characterized in that the second set in the axial direction (A) has more rows of teeth than the first set.

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