CZ298121B6 - Rotary cutting apparatus vertical axis of rotation and adjustable cutting height arranged on a one-axle small-sized tractor - Google Patents

Abstract

The present invention relates to a rotary cutting apparatus with vertical axis of rotation and adjustable cutting height arranged on a one-axle small-sized tractor, said rotary cutting apparatus being provided with a frame /1/ with a central tube /4/ and an external tube /6/ rotatably mounted thereon, a rotary disk /7/ and an inner shaft /10/ with a sliding disk /11/ wherein an adjusting device /13/ is arranged between said inner shaft /10/ and said central tube /4/.

Description

Rotary cutting unit with vertical axis of rotation and adjustable cutting height arranged on a single-axle mini tractor

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a rotary mowing device with a vertical axis of rotation and an adjustable cutting height which is particularly suitable for single-axis tractors and single-purpose mowers. It is also applicable to four-wheel tractors and motor mowers.

BACKGROUND OF THE INVENTION

The development of rotary mowers with a vertical axis of rotation over the past 50 years has been extremely extensive. He led to the fact that the rotary cutter, which uses a high peripheral speed of the blades without co-operation, has already replaced to a large extent the classical reciprocating cutter. The most important advantages of these rotary mowers have decided this. The high-speed rotary cutter, where the working peripheral speed of the blades is generally higher than 60 m / s, is not maintenance-intensive, is almost trouble-free and easy to operate at low weight.

Currently, the development has reached the following types:

A / rotary cutting deck with fixed rotating blade placed in a space that is closed from above and around the perimeter. The guard protects the operator from flying off solid parts that often occur on the harvested land. In addition to the stand separation, further multiple cuts and considerable crushing of the harvested material occur in the area under the cover. If the fixed blades are provided with oblique blades in their peripheral part, the machine also serves for material collection and for its transport to the magazine. Adjustment of the cutting height in this type of machines is ensured by height adjustment of the support wheels connected to the cover or to the machine frame. Some machines of this type are still equipped with vertical adjustment of the blades relative to the cover. This increases their applicability to the most diverse working conditions. An example may be an embodiment according to GB 1098492 A of 1968.

The embodiment according to JP 7087823 A of 1995 is a three-leg, front-mounted implement on a four-wheeled mini tractor. Even with this type of mowing device, the position of the blades relative to the machine housing can be adjusted and, in addition, copy wheels are located on the machine housing or frame. The production costs of such systems are relatively high and are therefore applied particularly in conditions where their functional advantages can be exploited economically. In principle, this type of mowing device is mainly used for mowing while being collected into the hopper, or the comminuted material is left on the stubble as part of the fertilization. Cutting devices of this type differ substantially from the arrangement according to the invention in terms of both arrangement and function.

Development has also come to the following types:

B / where it is a rotary cutter with knives rotatably mounted on the periphery of the rotating disc, (drum cutter). In this type, the rotating blade with the blades cuts the crop and the separated part of the harvested material is not comminuted and remains on the surface of the plot. A cylindrical extension is attached to the upper side of the rotating disc to prevent winding of the individual stalks. Drum mowers are particularly suitable for harvesting tall stands. In these mowers, the cutting height is adjusted by adjusting the position of the sliding disc that follows the surface of the plot. The adjustable distance of the outer surface of the sliding disc from the cutting plane of the blades determines the cutting height of this cutting device. The version according to GB 872372 A from 1961 is a device which corresponds to an aggregation with the currently produced universal tractors. Such an arrangement made it possible to change the cutting height only when the machine drive is switched off, since all the cutting height adjustment components are firmly connected

-1GB 298I2I B6 with rotating cutting deck parts. A disadvantage of such an arrangement is also that the sliding disc is rotatably mounted relative to the rotating disc and does not rotate only when it is in contact with the land surface. Such an arrangement for uniaxial mini tractors is unsatisfactory and is also unsatisfactory in terms of occupational safety.

The arrangement according to the patent document NL 9300052 A of 1994 already corresponds to the currently produced 2 and 4 drum mowers, which aggregate to universal tractors of higher performance classes. Adjustability of the sliding disks with respect to the cutting plane is ensured in this system by means of a hydraulic servo mechanism mounted on a vertical non-rotating shaft, which is rotatably mounted 10 in a rotating shaft and melts itself by means of additional bearings and flanges connected to the machine main frame. The arrangement according to NL 9300052 A, where the sliding disc is mounted on a short sliding bearing and on a double pivoting bearing with respect to the shop, represents a high manufacturing effort and also a rapid wear of these movable bearings in operation. Such an arrangement is not applicable to the mowing mechanism for small tractors because of their high production demands and high weight.

SUMMARY OF THE INVENTION

These drawbacks are partially eliminated by the rotary mowing device with a vertical axis of rotation and with the adjustment of the cutting height arranged on the uniaxial mini tractor according to the invention, in that the mowing machine is rigidly connected by the small tractor trough. In this central tube, the outer tube and the rotating disc with the blades are rotatably supported by bearings, and at the same time the driven pulley is connected to the outer tube, and the inner tube or shaft fixedly connected to the sliding disk is slidably mounted in the central tube.

Such an arrangement is less demanding in terms of production and allows good longitudinal and transverse terrain copying. Easy adjustment of the cutting height is ensured by an adjusting device which is directly connected to the inner pipe or shaft with the sliding disc and is at the same time reachable by the operator even during machine operation, allowing the operator to change the cutting height while driving and thereby adjusting the machine 30 to terrain conditions harvested vegetation. This creates good conditions for smooth work in rugged terrain and for overgrown crops and for low-cut mowing in conditions that are appropriate. The sliding disc, which in all drum mowing system systems is heavily loaded by the impact of solid obstacles often hidden in the crop under operating conditions, in the arrangement according to the invention, this sliding disc is mounted with respect to the frame 35 by a single sliding bearing and contains no movable pivot bearing.

Another advantage is that this sliding bearing is only in motion during the cutting height adjustment. The arrangement of the mowing device according to the invention creates good prerequisites for high operational reliability at low weight and low production demands.

BRIEF DESCRIPTION OF THE DRAWINGS

An example of an embodiment of a rotary cutter with a vertical axis of rotation and an adjustable cutting height arranged on a uniaxial mini tractor is shown in the drawings:

FIG. 1 is a longitudinal sectional view of a rotary mowing device in an embodiment with an adjusting device operable by a machine operator.

FIG. 2 is a longitudinal cross-sectional view of the rotary cutter in an embodiment with an adjustment device operable when the machine is stationary.

-2EN ZV31ZI 136

DETAILED DESCRIPTION OF THE INVENTION

The frame 1 of the mower is fixed to the frame of the mini tractor 3 by means of screws 2 and at the same time the frame 1 is fixedly connected to the central tube 4 and the outer tube 6 with rotating disc 7 and driven pulley 8 is rotatably supported on the tube 4. 4, the inner tube 9 or shaft 10 is slidably mounted in a rotationally fixed manner and are fixedly connected to the sliding disk 11. The frame 1 is connected to the cover 12. In the arrangement of the operating device 13 shown in FIG. 1, the lever 19 is connected to the spring 17 The lever 19 is rotatably mounted on the frame 1 by means of a pin 18 and is simultaneously connected to the inner tube 9 or the shaft 10. The lever 20 is simultaneously articulated on the lever 20 with the handle 21 and the rod 20 is adjustable to the latch 22 The handle 21 is easily and safely reached by the operator in the working position of the machine. In the arrangement of the adjusting device 13 with the mower stationary shown in FIG. 2, the inner tube 9 or the shaft 10 is connected to the nut 14, while the central tube 4 is rotatably but axially non-movably connected to the screw 15 provided with the handle 16.

The function of the rotary cutter with adjustable cutting height is as follows: When the frame 1 is fixedly coupled to the small tractor frame 3 by means of screws 2, the rotational movement of the motor 23 is transmitted via the drive pulley 24 and belt 25 to the driven pulley 8 non-rotatably connected to the outer tube 6 and the rotary disc 7 with knives 26. The outer tube 6 is mounted rotatably but axially non-movably relative to the center tube 4 by means of bearings 5. The inner tube 9 or shaft 10 is mounted non-rotatably but axially adjustable relative to the central tube 4 by means of the adjusting device 13. In the embodiment shown in Fig. 1, the desired cutting height is adjusted by the handle 21 by moving the linkage 20 to a suitable The sliding disk 11 is moved to the desired position by means of a rod 20 connected by means of a lever 19 to the inner tube 9 or the shaft 10. The protective cover 12 connected to the frame 1 ensures the protection of the operator and at the same time ensures a smooth exit of the cut crop from the mowing mechanism.

Claims (3)

PATENT CLAIMS Rotary mower with a vertical axis of rotation and an adjustable cutting height arranged on a uniaxial mini tractor, characterized in that the mower frame (1) is rigidly connected to the mini tractor frame (3) and at the same time the frame (1) is rigidly connected to the central tube / 4), whereby the outer tube (6) and the rotary disc (7) connected with the blades (26) connected to the central tube (4) are rotatably supported by bearings (5) and the driven pulley is connected to the outer tube (6) (8) and in the central tube (4) the inner tube (9) or shaft (10) is slidably and non-rotatably mounted with the sliding disk (11) and at the same time the inner tube or shaft (10) is relative to the central tube (4) axially adjustable by means of an adjusting device (13). Rotary mowing device according to claim 1, characterized in that the driven pulley (8) is connected by a belt (25) to a small-tractor pulley (24) or a single-purpose mower. Rotary mowing device according to claims 1 and 2, characterized in that the frame (1) is connected to the protective cover (12).