WO2008080710A1

WO2008080710A1 - Flail arrangement

Info

Publication number: WO2008080710A1
Application number: PCT/EP2007/062943
Authority: WO
Inventors: Johann Doppstadt; Horst Berger
Original assignee: Doppstadt Familienholding Gmbh
Priority date: 2006-12-27
Filing date: 2007-11-28
Publication date: 2008-07-10
Also published as: DE202006019687U1

Abstract

The invention relates to a flail arrangement (40) for comminuting materials, in particular wood scraps. The flail arrangement (40) has a rotor (42) which comprises at least two rotor discs (46, 48), which are arranged parallel to one another, and rotates about an axis (44). At least one eccentrically arranged flail (52) is provided between the rotor discs (46, 48), wherein the flail (52) has a basic body (56). Furthermore, a releasable tooth-shaped striking and/or cutting element (10) is arranged on the flail (52). Furthermore, the flail (52) is provided rotatably and/or pivotably between the rotor discs (46, 48). The flail (52) has a hardened cutting insert (20) on the cutting edge (22) of the tooth-shaped striking and/or cutting element (10).

Description

Schlegel arrangement

Technical area

The invention relates to a flail arrangement for comminuting materials, in particular wood waste containing

a) a rotor consisting of at least two mutually parallel rotor disks which rotate about an axis,

b) at least one eccentrically arranged between the rotor discs flail, wherein

the flail has a main body,

on which a tooth-shaped striking and / or cutting element is detachably arranged,

the flail is rotatably and / or pivotably provided between the rotor disks,

c) a hardened cutting insert on the cutting edge of the tooth-shaped striking and / or cutting element. State of the art

Schlegelanordnungen be in orbital percussion or rotor shredders for

Shredding wood waste or other materials used. For this purpose, the Schlegelanordnungen usually contain a rotating rotor with rotor discs, on which flails are mounted eccentrically and pivotally. With one revolution of the rotor, the flails align themselves radially outwards due to the centrifugal force. During the circulation, they hit on hammer-like material and split this. If a piece of material is not crushed by the impacting hammer, the flail, which is pivotally mounted on the rotor, can escape after the impact. Inadmissible high loads on the flail and thus damage to the flail arrangement are avoided. In many known flails, a cutting edge formed parallel to the rotor axis is provided to crush or pulp the material to be crushed in the manner of a hammer or a hoe.

By constantly hitting shredded material, the flails are exposed to considerable loads during operation of the rotor shredder and subjected to severe wear. It is known to form Schlegel in two parts. A body of considerable mass is pivotally mounted to the rotor with a pivot bearing. At this body a striking or cutting element is fixed with a cutting edge which impinges on the shredded material. The striking or cutting element is subject to wear and will be replaced from time to time. As a rule, however, it is not necessary to replace the main body.

In these two-piece mallets, it is important that the attachment of the cutting element to the base body is such that it is able to absorb strong impact loads and has no weak points. The impact forces should be transferred from the main body with large mass entirely on the impact or cutting element and thus on the material to be shredded. The reaction forces on impact with the shredded material are in turn absorbed by the basic body. In order to increase the durability of a striking or cutting element, use of hardened cutting edges or cutting inserts is known. The cutting inserts are made of hard material, such as hard metal, and therefore resist the high impact loads during operation longer. Thus, downtime for the exchange of impact or cutting elements are reduced and often only the cutting inserts must be renewed. Such a shredder therefore works more economically.

The utility model DE 93 05 835.7 Ul discloses a replaceable cutting body or a cutting element for a mallet of a striking mechanism. The cutting element has a striking surface in which a plurality of cutting units are used. The cutting units are made of hard material and have several cutting edges and surfaces. Furthermore, the cutting element has a shaft with which it is attached to a base body.

European patent application EP 1 698 398 A1 describes an exchange hammer for a striking mechanism, which is formed from a shank and a mallet head. With the shaft of the swivel is attached to a body. In a face of the flail head a cutting insert is used, which consists of five cutting units. The cutting units form different cutting edges and

Cutting surfaces and are made of hard material. In the area between cutting insert and shank several baffles are attached to the face. The baffles are also made of hard material and protect the face from material abrasion during operation of the striking mechanism. Such material abrasion is also referred to as leaching and causes cutting elements are no longer optimally maintained by the beater head.

A disadvantage of the known Schlegelanordnungen is that the materials to be shredded, especially wood waste, are heavily frayed by the hammer-like flailing mallets. Shredded wood waste can be composted well. In the meantime, however, more and more wood chips are used for surface sealing, for example in gardens, playgrounds or riding areas, and for energy production. In such applications, emphasis is placed on a smooth surface of the wood chips or Wood chips laid, as these then have a better flow behavior and take up less storage space. Furthermore, a risk of injury from splinters is lower. For smooth wood shavings is among others the slogan "Chopped, not shredded!" advertised.

Disclosure of the invention

The object of the invention is therefore to avoid the disadvantages of the prior art and to improve the cutting or wedge effect on material to be comminuted.

According to the invention the object is achieved in that in a flail assembly for crushing materials of the type mentioned

d) the tooth-shaped impact and / or cutting element is formed from two impact surfaces, which are arranged at an angle between 122 ° and 127 ° to each other.

The invention is based on the principle of dividing a striking surface into two partial surfaces, which are at an angle of between 122 ° and 127 ° to each other, with 125 ° proving to be the most favorable angle in practice. As a result, a cutting edge of the striking or cutting element is arranged more favorably to the material to be shredded. The material is better chopped during operation of the flail assembly and does not fray as much. This is desirable, for example, in a shredding of wood waste in order to be able to use it more universally. Thanks to an improved cutting action, the flail assembly also works more efficiently and material throughput is increased.

Another advantage of the invention is that only a new striking or cutting element is used. All other components of the Schlegelanordnung can still be used unchanged. Thus, a conversion of a flail assembly according to the invention is possible quickly and easily by an uncomplicated replacement of the striking or cutting elements. The flail arrangement can be adapted to specific requirements of comminution. Furthermore, the actual Cutting edge not changed. Existing devices for protecting the cutting edge, such as hardened cutting inserts, are also applicable to the invention. Thus, the impact or cutting element according to the invention can be produced inexpensively.

An advantageous embodiment of the flail arrangement according to the invention for the comminution of materials has proven to be when a hardened cutting insert is arranged on the radially outside of a rotation axis outer face. This surface forms a cutting edge and is subject to high loads by constantly hitting material to be shredded. A hardened cutting insert as a cutting edge counteracts wear and thus increases the life of the striking or cutting element. This reduces downtime of the flail assembly to replace worn impact or cutting elements. Furthermore, often only the worn cutting inserts and not the complete striking or cutting element have to be replaced. Maintenance costs are reduced and operation of the flail assembly is more economically feasible.

The hardened cutting insert consists in a preferred embodiment of the invention of at least two parts. Thus configured, a mallet remains functional after wear or breakage of a portion of the cutting insert. Thus, even less downtime for exchange of impact or cutting elements. In addition, in a repair of the striking or cutting element cost only the damaged or broken part of the cutting insert is replaced. Through the use of multi-part, hardened cutting inserts, the operation of a flail arrangement becomes even more efficient and cost-effective.

According to an expedient embodiment of the invention, the cutting insert contains at least one cutting unit and at least one striking surface element. The striking surface is mounted on the striking surface below the cutting units and is preferably also made of hardened material. The striking surface below the cutting insert is heavily stressed by constant contact with crushed material. As a result, material is removed from the clubface and it comes to so-called washouts. These washouts reduce the stability of the striking or cutting element and attachment of the cutting units. The impact surface elements prevent leaching and increase the durability of a striking or cutting element. These must therefore be replaced less frequently.

In a further advantageous embodiment of the flail arrangement according to the invention, a recess for the cutting insert is provided in the impact surface. Through the recess of the cutting insert is supported on the largest possible area and can be particularly stable attach to the clubface. A breaking of the cutting insert by high loads when shredding shredded material is difficult. This in turn increases the life of a beater and thus the availability of the beater assembly. Also, with a possible gapless and continuous transition between the cutting insert and club face, the cutting behavior of the bowl is improved.

The cutting insert consists in an effective embodiment of the invention of tooth-shaped cutting units. A tooth-shaped cutting unit has several cutting edges and surfaces. This also leads to an improvement of the cutting behavior of the bowl. The tooth-shaped cutting units also enable a more effective chip removal. Overall, thus the efficiency of a beater assembly is increased. Furthermore, the impact or cutting element is functional even after a breaking out of a cutting unit. Thus, the Schlegelanordnung remains longer operational.

In a preferred embodiment of the invention, the tooth-shaped impact and / or cutting element has a shaft which is fastened in a recess of the base body. The shank serves to secure and transmit forces between the base body and the striking or cutting element. Due to the shaft, the base body and the attachment do not come into contact with shredded material during operation and are therefore not subject to the corresponding wear. Even with a very heavy wear or destruction of the front part of the striking or cutting element with the cutting edge beat neither Body nor the attachment to be shredded material. Elaborate and costly maintenance or repair work on the body with long downtime is thus avoided and the impact or cutting element as a significant wearing part can be exchanged quickly and easily.

In a preferred embodiment of the flail arrangement according to the invention for comminuting materials, the shaft is fastened to the radially inner striking surface of the tooth-shaped striking or cutting element. Consequently, the shaft is protected by the radially outer part of the striking or cutting element from hitting shredded material and at the same time optimally transfers forces between the base body and the striking surfaces. The erfingsungsgemäße Schlegelanordnung works more efficient and more economical by avoiding maintenance downtime.

Further advantages emerge from the subject matter of the subclaims, as well as the drawings with the associated descriptions.

Short description of the drawing

Fig. 1 shows in a perspective view an embodiment of a

Impact or cutting elements of a flail arrangement of the cutting material facing side.

Fig. 2 shows the striking or cutting element of Fig. 1 in a schematic

Side view.

Fig. 3 shows a schematic diagram of a section of a

Schlegel arrangement in supervision.

Fig. 4 shows a schematic diagram of a cross section of the

Flail assembly of Fig. 3 along the section line AB. Preferred embodiment

In Fig. 1, 10 denotes a tooth-shaped impact element, which is produced for example as a cast part. The impact element 10 includes two impact surfaces 12, 14, which are arranged at an angle 16 of 125 ° to each other. The radially outer striking surface 14 has a recess 18 in which a plurality of tooth-shaped cutting units 20 are attached. The cutting units 20 together form a cutting insert and are made of hard material, such as carbide. They are connected to the impact element 10 by brazing or welding. Alternatively, an adhesive connection is possible. Each cutting unit 20 has a plurality of cutting edges 22 and thus allows a high dewatering effect on shredded material.

In a further recess 24 of the impact surface 14 a plurality of impact surface elements 26 are mounted. The striking surface elements 26 are also made of hard material and protect the club face 14 from leaching. By dividing into a plurality of impact surface elements 26, which connect directly to the cutting units 20, the striking surface 14 is particularly well protected. Even if a striking surface element 26 breaks out, the protective effect remains restricted. Accordingly, when a cutting unit 20 breaks out, the striking element 10 continues to function through the remaining cutting units 20.

On the radially inner impact surface 12, a shaft 28 is attached. The shaft 28 includes a mounting hole 30 for a bolt for attaching the striking element 10 to a base body. Furthermore, the shaft 28 has projections 32 and 34, in order to ensure a firm grip with an optimal power transmission between the base body and striking element 10.

Fig. 2 shows the striking element 10 of Fig. 1 in a side view. The same components are therefore also designated by corresponding reference numerals. By the angle 16 of 125 ° between the striking surface 12 and the striking surface 14 hit the cutters 20 mounted in the recesses 18 at an optimum angle on shredding good and chop or chop this without it much to shred. Because of the angle 16 between the impact surfaces 12 and 14 while a use of conventional, known cutting units 20 is possible. The

Impact element 10 is thus inexpensive to produce.

In Fig. 3, a section of a flail assembly 40 is shown in plan. Fig. 4 shows a cross section of the flail assembly 40 along the line AB. Like components are again denoted by corresponding reference numerals. The Schlegelanordnung 40 includes a rotor 42 having an axis 44 and at least two mutually parallel rotor discs 46, 48. With a drive, not shown here, the axis 44 with the rotor discs 46, 48 is rotated (arrow 50, Fig. 4) ,

Between the rotor discs several flail 52 are mounted with bearings 54 radially pivotable. Due to the rotational movement (arrow 50), the flails 52 align radially outward. Each flail 52 has a main body 56 with a recess in which the shaft 28 of a striking element 10 is releasably secured by a bolt 58. This enables a quick and uncomplicated exchange of worn or damaged striking elements 10. During operation of the Schlegelanordnung 40 also optimal power transmission between impact element 10 and body 56 is ensured.

The striking element 10 includes a radially inner striking surface 12 and a radially outer

Impact surface 14, which are arranged at an angle 16 of 125 ° to each other. This achieves the best possible alignment of the cutting units 20 with respect to material to be comminuted. The material is cut or chopped by the rotating impact elements 10 into small, less defibered parts.

The outer striking surface 14 is also equipped with a plurality of impact surface elements 26 in addition to the cutting units 20 made of hard material. This prevents wear or damage to the striking surface 14. In an alternative Execution is also the inner impact surface 12 formed with impact surface elements 26 to protect them as well.

If the material can not be cut up right away, the corresponding flail 52 dodges through the movable bearing 54. This will damage the

Schlegelanordnung 40 avoided by too hard shredded material.

Bezugszeichenhste

10 striker 40 Schlegelanordnung

12 radially inner face 42 rotor

14 radially outer face 44 axis

16 angle (125 °) 46 Rotor disc

18 recess 48 rotor disk

20 separating unit 50 arrow

22 cutting edges 52 mallets

24 recess 54 bearings

26 striking surface element 56 basic body

28 shaft 58 bolt

30 mounting hole

32 advantage

34 advantage

Claims

claims

1. Schlegelanordnung (40) for crushing materials, in particular wood waste, containing

a) a rotor (42) consisting of at least two mutually parallel rotor disks (46, 48) which rotate about an axis (44),

b) at least one between the rotor discs (46, 48) eccentrically arranged flail (52), wherein

the flail (52) has a main body (56),

on which a tooth-shaped striking and / or cutting element (10) is detachably arranged,

the flail (52) is rotatably and / or pivotably provided between the rotor disks (46, 48),

c) a hardened cutting insert (20) on the cutting edge (22) of the tooth-shaped striking and / or cutting element (10),

characterized in that

d) the tooth-shaped impact and / or cutting element (10) of two impact surfaces (12, 14) is formed at an angle (16) between

122 ° and 127 ° to each other.

Second flail assembly (40) for crushing materials, in particular wood waste according to claim 1, characterized in that a hardened cutting insert (20) on the radially from an axis of rotation outer striking surface (14) is arranged.

3. Schlegelanordnung (40) for crushing materials, in particular wood waste according to one of claims 1 or 2, characterized in that the hardened cutting insert (20) consists of at least two parts.

4. flail assembly (40) for crushing materials, in particular wood waste according to one of claims 1 to 3, characterized in that the cutting insert (20) at least one cutting unit (20) and at least one impact surface element (26).

5. Schlegelanordnung (40) for crushing materials, in particular wood waste according to one of claims 1 to 4, characterized in that in the impact surface (14) has a recess (18) for the cutting insert (20) is provided.

6. Schlegelanordnung (40) for crushing materials, in particular

Wood waste according to one of claims 1 to 5, characterized in that the cutting insert (20) consists of tooth-shaped cutting units (20).

7. Schlegelanordnung (40) for crushing materials, in particular wood waste according to one of claims 1 to 6, characterized in that the tooth-shaped impact and / or cutting element (10) has a shank (28) which in a recess of the base body ( 56) is attached.

8. flail assembly (40) for crushing materials, in particular wood waste according to claim 7, characterized in that the shaft (10) on the radially inner striking surface (12) is fixed.