SU1230526A1 - Rotary cutting apparatus - Google Patents

Description

 one

The invention relates to agricultural machinery and can be used in rotary type mowers.

The purpose of the invention is to reduce the loss of the crop.

FIG. 1 shows the proposed scheme of the cutting apparatus of the rotary mower, view in plan; on .fig. 2 is a view A of FIG. 3i in FIG. 3 is a diagram of the cutting apparatus of a rotary mower (overlapping zone).

The cutting unit of the rotary mower consists of rotors 1 and 2, on which cutting knives 3 and 4 with a thickness of 5 J mounted with overlapping are hinged. The rotors 1 and 2 are mounted on axles x 5 and 6, the distance between which is a, and the distance from them to the free ends of the corresponding cutting knives 3 and 4 is r, the axis of the rotor 1 is inclined relative to the axis of the rotor 2 by an angle c such that in the overlap zone (marked by hatching in Fig. 1), the cutting knife 3 is located above the cutting knife 4 at the shortest distance h at the beginning of the overlap zone, where the value is due to the height tolerance for the installation of the cutting knives and . In their forward positions, perpendicular to the direction of the p d rotors 1 and 2, the free ends of the cutting knives 3 and 4 are located at the same height.

Rotational cutting apparatus operates as follows.

During operation, the rotors 1 and 2 are rotated by friction.

The first drive (not shown) under the action of centrifugal forces knives 3 and 4 are thrown into the working position and the grass is mowed during the forward movement of the mower 5.

When the friction drive slips, the relative position of the cutting knives 3 and 4 may be disturbed, but due to the fact that in the zone of overlap 10 ten, the knives 3 and 4 are located

over the other, no impact occurs, which increases the reliability of the rotary mower and allows the use of a friction drive to drive the rotors. 15 The value of the angle of inclination oi is determined by the following pre-prediction.

The beginning of the overlap zone is located from the direct connecting axis 5 and 6 20 of the rotors 1 and 2 at a distance equal to

25

in this zone of the beginning of the overlap zone, the distance between the edges of the knives 3 and 4 facing each other should be at least b, i.e. the magnitude of the possible changes in the relative position of the knives 3 and 4.

When determining the distance between the middle PIERSHEADS of the cutting wheels 3 and 4 is equal to (5 + h), the angle c6, keeping this distance under the condition that the ends of the cutting knives 3 and 4 are located in the front position at one 35 level, is determined by expression

thirty

Circctq

q

5fb

in this zone of the beginning of the overlap zone, the distance between the edges of the knives 3 and 4 facing each other should be at least b, i.e. the magnitude of the possible changes in the relative position of the knives 3 and 4.

When determining the distance between the middle PIERSHEADS of the cutting wheels 3 and 4 is (5 + h), and the angle c6, keeping this distance under the condition that the ends of the cutting knives 3 and 4 are located in the front position at the same level, is determined by the expression

Circctq

q

5fb

fig-2

Editor Y. Sereda

Order 2465/3 Circulation 679 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Compiled by E. Reingart

Tehred I.Gaydosh Proofreader A.Zimokosov

Claims (1)

A ROTARY CUTTING DEVICE containing a series of rotors on which cutting knives overlapping each other are pivotally mounted, and a friction drive of rotors, characterized in that, in order to reduce losses of the harvested crop, the axes of the rotors are inclined forward in the direction of movement of the apparatus in the plane perpendicular to the plane of placement of the remaining rotor axes, and the inclination angle & is selected from condition ¹ 5 + h g r- \ g-- 4 where I ¹ is the distance from the free end of the cutting knife to the axis of the rotor on which it is mounted ', 5 - knife thickness; a is the distance between the axes of adjacent rotors; h - tolerance for the installation of rotors in height and their oscillation during operation. SU, „1230526 a 1 (rig!