DE102021103004A1 - Storage of a knife of a knife rotor - Google Patents

Abstract

There is a storage of a knife (1) or a fixed in a wear plate blade of a knife rotor for the shredding of wood, from an upper and a lower clamping plate (2) and with a cutting edge (3) of the knife (1) or the blade and one of the cutting edge (3) opposite support surface (4) of the knife (1) or the wear plate is provided, which has an optimized foreign body protection, which largely or even completely excludes deformations of expensive rotor components that lead to scrap in the event of an overload, which is achieved as a result that the lower clamping plate (2) at a distance from the support surface (4) is equipped with a clamping block (5) and a clamping plate (6), between which clamping bolts (7) are clamped, which extend perpendicularly from it in the direction of the support surface (4) of the knife (1) or the wear plate.

Description

The invention relates to a mounting of a knife or a blade in a wear plate of a knife rotor for chopping wood, with an upper and lower clamping plate of the knife or the blade, with a cutting edge and a support surface of the knife or wear plate opposite the cutting edge and with a knife - or protection against foreign objects in the blade.

A tool for chopping wood is known, DE 20 2008 017 494 U1 , which has two superimposed knife plates and a knife held in between and on the back opposite the cutting edge of the knife has knife adjusting screws which are supported on the back of the knife designed as a support surface, the knife adjusting screws being guided through a block with protective screws on the lower knife plate is attached.

The disadvantage of this known tool is that these knife setscrews have to be time-consuming and precisely set to size during the assembly of the knife, which must also be done in a very small space in the machine by means of tools, the knife set screws then still having to be secured with lock nuts, which is often very time-consuming and cumbersome. Another disadvantage is that in the event of damage caused by an excessive impact on the cutting edge, e.g. by a large or hard foreign body, either the thread of the knife adjusting screws is destroyed or the protective screws for fastening the block are sheared or bent, which in each case leads to costly repair work which are also very time-consuming and labor-intensive.

The object of the invention is to provide a mounting for a knife or a blade of a knife rotor fixed in a wear plate, which has an optimized foreign body protection that largely or even completely excludes deformations of expensive rotor components that lead to scrap in the event of an overload.

The solution to this problem results in connection with the features of the preamble of the first protection claim according to the invention in connection with the technical features of its characterizing part in that the lower clamping plate is equipped with a clamping block and a clamping plate spaced from the support surface, between which clamping bolts with a preselected Clamping force are held clamped and which extend therefrom perpendicularly in the direction of the support surface of the knife or the wear plate.

By means of these clamping bolts clamped between the clamping block and the clamping plate, an effective overload protection is provided which, in the event of a strong impact on the cutting edge of the knife, the blade or the wear plate, drives the clamping bolts through the clamp by exceeding the clamping force in the direction of impact, so that neither the knife nor the wear plate are mechanically deformed. Damage does not occur in the event of a central impact on the knife, so that it can then simply be set up again, unless an impact occurs off-center, in which a clamping bolt can then possibly be bent, which, however, subsequently due to the simple construction the device can be easily exchanged.

Further advantageous refinements of the subject matter arise with and in combination from the following subclaims.

According to a preferred embodiment of the invention, the clamping bolts extend to the support surface of the knife or the wear plate in which a blade is mounted and support this or these there in an evasive direction in a form-fitting manner, so that the simplest mechanical components are used here, which can be manufactured very economically and are cheap and easy to replace if necessary.

According to another very advantageous inventive embodiment, the clamping bolts are provided with threads at their ends facing the support surfaces and the support surfaces are in turn provided with corresponding internal threads, so that the clamping bolts can be screwed into the support surfaces in such a way that the functional reliability is further increased, since a central or lateral impact, the clamping bolts cannot move sideways, but can instead pick them up in the direction of the clamping bolts and insert them into the clamping block via the clamping plate or slip through between them.

To produce an adjustable overload protection against impacts on the cutting edge of the knife or the blade of the wear plate, the clamping plate is penetrated on both sides of the clamping bolt with screws that extend into the thread of the clamping block and are tightened with a predetermined torque. By preselecting the torque, the overload protection can be optimally set, such a setting can be made, for example, using a pneumatic impact wrench or cordless impact wrench, which requires very little time, which corresponds to about only a quarter of the time required for the assembly of a knife according to the previously known Prior art is claimed.

Preferably, behind the support surface of the knife or the wear plate, an escape space of several centimeters is provided so that the knife or the wear plate have a sufficiently large space available to be able to retreat backwards or in the direction of the impact.

To simplify the blade change, the clamping bolts can advantageously also be pre-set to a required dimension with a void prior to the assembly of the knife or the wear plate, so that all knives or blades can be quickly and easily assembled in a pre-fixed position, which increases the economic efficiency of the inventive storage further improved.

The clamping bolts themselves consist of simple, unprocessed structural steel with a smooth surface, so that if they are deformed they can be exchanged for new unbent clamping bolts at very low cost.

• 1 eine räumliche Darstellung der Lagerung eines Messers auf einer unteren Klemmplatte eines Messerrotors.

An exemplary embodiment of the invention is described in more detail below with reference to a drawing. It shows:

• 1 a three-dimensional representation of the storage of a knife on a lower clamping plate of a knife rotor.

The storage of a knife 1 a knife rotor for shredding wood consists of an upper and a lower clamping plate, not shown in the drawing 2 for the knife 1 with a cutting edge 3 and one on the edge 3 opposite side formed support surface 4th , on which there are two parallel clamping bolts 7th support that spaced from the knife 1 between a clamping plate 6th and a terminal block 5 the lower clamping plate 2 are frictionally clamped.

The clamp 6th has four through holes and the terminal block 5 four corresponding threads in the screws 8th through the clamp 6th are screwed through, which are tightened by means of a pneumatic impact screwdriver or cordless impact screwdriver with a predetermined torque to the clamping bolts 7th to clamp with a defined clamping force and thus an adjustable overload protection against impacts on the cutting edge 3 of the knife 1 or to produce the blade or the wear plate.

Between the support surface 4th of the knife 1 and the terminal block 5 the lower clamping plate 2 is an escape room 9 produced in which a knife 1 or a wear plate can escape in the event of an excessive impact from a foreign body in order to prevent the destruction of a knife rotor.

The clamping bolts 7th are made of simple structural steel and have an unmachined, smooth surface.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 202008017494 U1 [0002]

Claims (7)

Storage of a knife (1) or a blade in a wear plate of a knife rotor for chopping wood, from an upper and a lower clamping plate (2) and with a cutting edge (3) of the knife (1) or the blade and one of the cutting edges ( 3) opposite support surface (4) of the knife (1) or the wear plate, characterized in that the lower clamping plate (2) spaced apart from the support surface (4) is equipped with a clamping block (5) and a clamping plate (6), between which clamping bolts (7) are held clamped, which extend vertically therefrom in the direction of the support surface (4) of the knife (1) or the wear plate. Bearing according to claim (1), characterized in that the clamping bolts (7) extend up to the support surface (4) and support the knife (1) or the wear plate there in an evasive direction in a form-fitting manner. Bearing according to claim (1), characterized in that the clamping bolts (7) are provided with threads at their ends facing the support surfaces (4) and the support surfaces (4) are provided with corresponding internal threads and the clamping bolts (7) are provided with the internal threads of the support surfaces (4) ) are screwed in. Storage according to one of the preceding claims, characterized in that on both sides of the clamping bolts (7) screws (8) are guided through the clamping plate (6), which extend into threads in the clamping block (5) and which are tightened with a predetermined torque and that an adjustable overload protection against impacts on the cutting edge (3) of the knife (1), the blade or the wear plate is created. Storage according to one of the preceding claims, characterized in that behind the support surface (4) of the knife (1) or the wear plate, an escape space (9) of up to 130 mm depth is provided. Bearing according to one of the preceding claims, characterized in that the clamping bolts (7) can be preset to a required dimension with a void before the knife (1) or the wear plate is installed. Bearing according to one of the preceding claims, characterized in that the clamping bolts (7) are made of structural steel with a smooth, unmachined surface.

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