SU1192697A1 - Harvester cutting apparatus knife - Google Patents

Abstract

KNIFE OF A CUTTING MACHINE, made in the form of a flat disk with a serrated cutting edge, characterized in that, in order to improve the quality of commercial products, the cutting edge of the knife is made in the form of several groups of teeth with variable pitch and a variable angle of grinding, evenly spaced around the circumference of the disk, in this case the group includes at least one to four teeth with an increasing sharpening angle in the direction of the working rotation of the knife, and each tooth has a sharpening with a positive cutting angle on three cutting grains, two of which are working, and a third is reserve. (L so you

Description

The invention relates to agricultural machinery, in particular to the construction of machines for harvesting cabbage.

The aim of the invention is to improve the quality of commercial products.

FIG. 1 shows a knife, a general view from above; in fig. 2 - knife sector with three groups of teeth; in fig. 3 shows section A-A in FIG. 2; in fig. 4 shows a section BB in FIG. 2; in fig. 5 shows a section B-B in FIG. 2; in fig. 6 a section of YYY in FIG. 2

The knife is cut off, its cleaning machine apparatus is made in the form of a flat disk 1 with a figured hole 2 located in the center for securing the disk on the output shaft of the drive gearbox. Cutting the edge 3 of the disk 1 is made in the form of several groups of teeth evenly spaced around the disk's circumference, for example, sectors through 45 °.

Each sector contains, respectively, subgroups of teeth with variable pitch and

variable angle sharpening, which are placed through 15 °. at the same time, in the direction of the working rotation of the disk, the teeth have a variable pitch (in the first group - 2 teeth with 2T1 tongue, in the second group - 3 teeth with pitch .TT2, in the third group - 4 teeth with 4TZ pitch, in the next sector the alternation repeats) . In each group, the teeth have a variable sharpening pitch of 30-60 °, increasing in the direction of the working rotation of the disk. For example, in a group of three teeth, tooth 4 has a sharpening angle of 60 °, a tooth of 5–45 °, a tooth of 6–30 °. Each tooth in the group has sharpened three cutting edges, while in the process of working the knife two cutting edges work at the same time, and a third is a backup and is used when reinstalling the knives on the output shafts of the gearboxes.

The numerical parameters of the teeth of the cutting edge of the disk knife in relation to the design of the circular knives of the harvesting machine are shown in the table.

Large Mi 2Ti 30Н 15EI 5 Medium М2 3Т2 24Н2 12 Еа 4 Small ,, 9ЕЗ 3

Given the arrangement of the teeth of three types of sizes around the circumference of the system improved the manufacturability of serrated knives.

During the operation of the stalk harvester, the cabbage fork is cut as a result of both sliding and straight cutting, which is a result of the forward movement of the combine and the rotation of the circular knives 1. According to the norms accepted for agricultural machines, the optimum speed of rotation of the circular knives is 10 -12 m / s. when the speed of the forward movement of the combine is 0.95-1.35 m / s.

This design of the knife in the form of several groups of teeth with

The variable sharpening angle, which increases towards the working rotation of the knife, provides optimal cutting conditions, since a constantly increasing groove is formed in the stump and each subsequent tooth (with an increasing sharpening angle) is activated by the groove from the previous tooth. By this, the cutting conditions are improved, an even cut of the stump is achieved, which improves the quality of the cabbage fork.

In addition, the teeth design of the teeth allows the inertial forces of the rotating disk knife to be used when cutting, which reduces the load on the gearbox. . 0 10Pj 6

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FIG. five

FIG. five

Claims (1)

KNIFE OF THE CLEANING MACHINE, made in the form of a flat disk with a toothed cutting edge, characterized in that, in order to improve the quality of marketable products, the cutting edge of the knife is made in the form of several groups of teeth with a variable pitch and a variable angle of sharpening, evenly spaced In this case, each group includes at least one to four teeth with an increasing sharpening angle in the direction of the working rotation of the knife, and each tooth has a sharpening with a positive cutting angle of three uschim faces, two of which are working, and the third backup.