DK155406B - AGRICULTURAL GRINDING EQUIPMENT - Google Patents

Description

DK 1 5406B

- 1 -

The invention relates to an abrasive grinder for agricultural wheel cutters in accordance with the preamble of claim 1.

In known embodiments of this kind (e.g., DE Patent Specification 12.37.377), the grinding wheel is mounted freely pivotally on its drive shaft. This option of turning the grinding wheel during grinding has the advantage that the grinding wheel wears evenly throughout its life. However, it has been found to be a disadvantage that the cutting blades are not sharpened uniformly throughout their length. The reason for this is as follows: Due to the radial position of the cutting blades on the front side of the cutting wheel, the grinding wheel during grinding is always affected by a rotating knife on its inner, abutting half of the cutting surface lying on the cutting wheel, while the outer edge of the cutting wheel facing away from the cutting wheel shaft. abrasive half is only touched by a knife at intervals. In doing so, it is preferably rotated and grasps only in a direction which is opposite to the direction of rotation of the cutting wheel. However, this implies that the relative grinding speed is very small on the inner abrasive half of the disc, but due to the opposite rotational directions of the abrasive and knife surfaces is very large on the outer abrasive half, whereby the blades are abraded more in the outer region than in the outer region. innermost.

Substantially better conditions are provided if, as indicated in the characterizing part of claim 1, during grinding, the grinding wheel can only rotate freely in a direction equal to the direction of rotation of the cutting wheel.

According to a proposal in the invention, the abrasive disc can be connected to the feed shaft by means of a free-running coupling, which is designed as a locking and clamping free-running or the like.

BRIEF DESCRIPTION OF THE DRAWINGS An embodiment of the invention is shown in schematic representation, and will be described in more detail below.

1 denotes a cutting disc which is rotatably mounted in the cutting housing 2 with side walls 3 in a cutter and equipped with the blades 4.

The rotary blades 4 run past a counter cutter, which is not shown in the drawing, where they cut away the feed material by the counter cutter.

The blades 4 can be abraded on their abrasive surface 5 by means of an abrasive apparatus, which is connected on the side of the counter-cutter to the side wall 3 in the cut-

DK 155406 B

housing 2 and positioned eccentrically with respect to the blade rotation axis ·

The abrasive apparatus has an abrasive disc 6 which is mounted on the free end of a shaft 7 so as to be able to pivot freely in a direction of rotation which is equal to the direction of rotation of the cutting disc 1, but is blocked in the opposite direction of rotation. The shaft 7 is axially displaceable in a bearing housing 9, which is connected via a middle flange 8 to the side wall 3 of the cutter housing 2, but the bearing without being rotatable and is provided with a screw bore 10 at the end facing away from the abrasive disc 6.

10 A compression spring 11 is positioned between bearing housing 9 and abrasive disc 6 so that it bears with one end against a collar 12 on the bearing housing 9 and with the other end against a disc 13 fixed on the shaft 7 * As a stop 14 a screw bolt acts 15, which can be screwed into the screw bore 10 of the shaft 7 and which, with a front face 14 of its ring wheel 16, can abut an end surface 17 of the bearing housing 9.

The handwheel 16 has on its circumferential grooves 18 which are adjacent to each other at a small distance, with which a bolt 20, which is pivotally mounted about a shaft 19 on the bearing housing 9, can engage.

The function of the grinding machine is as follows: 20 For feeding the grinding wheel 6 for grinding the cutting blades 4, the groove 20 is out of engagement with the grooves 18 on the handwheel 16 of the screw bolt 15. The handwheel 16 can consequently be rotated so that the screw bolt 15 is moved in the direction out. of the screw bore 10 on the shaft 7.

Thereby the shaft 7 and thus the abrasive disc 6 are displaced via the force of the spring 25 in the direction of the cutting disc 1. When the abrasive disc 6 now comes into contact with the abrasive surfaces 5 of the blades 4, which can be seen with the sparking, the handwheel 16 is rotated another such distance. , which corresponds to the tension for the entire grinding process. Thereafter, the handwheel 16 is inadvertently prevented from rotating by itself by swinging the bolt 20 30 into one of the grooves 18. The abrasive disc 6 is now automatically tightened by the compression spring 11 corresponding to the wear on the blades 4 until the handwheel 16 with its front 14 engages. towards the end surface 17 of the bearing housing 9.

Then the grinding is completed. The latch 20 is now again rotated out of engagement with the grooves 18 on the handwheel 16, and the abrasive disc 6 is moved 35 by turning the handwheel 16 against the force of the compression spring 11 away from - 3 -

DK 155406 B

the cutting disc 1 back to a disengaged position.

As the grinding proceeds automatically, the driver can perform other work throughout the grinding time.

5

Claims (2)

1. Abrasive apparatus for agricultural disc wheel cutters whose blades for grinding may come into contact with an abrasive disc on the side of the cutter, which is connected to a shaft which is eccentrically disposed with the blade rotational axis of the cutting housing and is axially adjustable, characterized in that the abrasive disk (6) can only rotate freely in one direction of rotation, which is equal to the direction of rotation of the cutter (1), and is blocked in the other direction of rotation. Abrasive device according to claim, characterized in that the abrasive disc (6) is connected to the shaft (7) via a free-running clutch (21) which is a locking and clamping orifice or similar.