JPH0956247A - Straw cutter in threshing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject straw cutter furnished with straw cutting edges retaining their sharpness to the utmost even after used over a long period. SOLUTION: Plural straw cutting edges 4 are supported upon a support flame in such a way as to be independently put from the outside of threshing teeth 2a into between the rotational loci of the respective threshing teeth 2a. One side 4c of the edge part 4b of each body 4a of the straw cutting edges 4 is welded or thermally sprayed with a wear-resistant compound 5, and the face 4d opposite to that with the deposit of the compound 5 is made so as to be taperedly slant so that the compound 5 is situated at the tip 4e of the edge part 4b when viewed from the section of the edge part 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threshing device in which a plurality of straw cutting blades are supported by a support frame in such a manner that they are individually inserted from the outer side of the handle teeth into the turning loci of the handle teeth. The straw cutting device.

[0002]

2. Description of the Related Art In a straw cutting device for a threshing machine as described above, deterioration of sharpness due to wear of a blade portion of a straw cutting blade has been a problem for a long time. Therefore, measures have conventionally been taken such as heat treatment of the entire blade portion to increase the wear resistance of the entire blade portion.

[0003]

However, even if the entire blade portion of the straw cutting blade is heat-treated, if it is used for a long period of time, the blade portion will be worn away from the tip side first and the blade edge will be rounded, resulting in sharpness. There was a problem that it decreased.

An object of the present invention is to provide a straw cutting device for a threshing device equipped with a straw cutting blade whose sharpness is not deteriorated as much as possible even after long-term use.

[0005]

[Means for Solving the Problems]

[Structure] The characteristic structure of the invention according to claim 1 is that in the straw cutting device of the threshing device described at the beginning, an abrasion-resistant compound is welded to one surface of the blade portion in the main body of each straw cutting blade. Alternatively, the surface opposite to the side where the compound is present is formed into a tapered inclined surface so that the compound is positioned at the tip of the blade in a cross-sectional view of the blade by thermal spraying.

According to a second aspect of the present invention, in the invention according to the first aspect, the main body of each straw cutting blade is
A pair of U-shaped plate members are integrally formed one by one on opposite side walls, and for each plate member, an abrasion resistant compound is welded or sprayed on the inner surface of the side walls, and in a cross-sectional view of the blade portion. The compound is located at the tip of the blade, the outer surface of the both side walls is formed into a tapered inclined surface, each plate material, in a state in which the outer surfaces of the both side walls face each other, the back portion of the support frame. It is supported from the side.

[Operation] According to the structure of claim 1, as shown in FIG. 6A, for example, the surface 4c on the compound 5 side, which becomes the tip 4e of the blade portion 4b of the straw cutting blade, is the surface on the opposite side. The state becomes harder than 4d. Therefore, as the cutting work progresses, the opposite surface 4d wears first, and the compound 5 side surface 4c wears after this. That is, FIG.
As shown in (b), the thin compound 5 always has a sharp tip 4e, and the compound 5 always projects from the opposite surface 4d. As a result, even if the blade portion 4b is worn, the sharp tip 4e is always maintained.
The sharpness does not decrease.

According to the second aspect of the present invention, the same action as that of the first aspect of the present invention can be achieved, and in addition, the straw cutting blades face each other in a plurality of U-shaped plate members. Since the pair of side walls are integrally formed one by one, it is possible to perform the manufacturing efficiently, such as mounting and positioning to the support frame in a short time, as compared with the case where the straw cutting blades are separately formed one by one.

[Effect] Therefore, according to the structure of claim 1, even if the blade portion of the straw cutting blade is worn away, the sharp tip is not always maintained and the sharpness is not lowered, and the blade portion is re-polished. It was possible to improve the work efficiency by extending the life up to.

According to the structure of claim 2, in addition to the same effect as the effect of the structure of claim 1, the manufacturing cost can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a handling barrel 2 that gives a handling action to the grain culms conveyed by the feed chain 1 is arranged inside the handling chamber A, and the lower side of the handling chamber A is along the circumferential direction of the handling barrel 2. Arranging an arcuate receiving net 3, and swinging and sorting device 6 for sieving and sorting the leaked material while swinging and transferring it, picking sardine 7 for sending sorting air, and collecting grain from swinging and sorting device 6 first A threshing device is configured by providing each of a product collecting unit 8, a second product collecting unit 9 that collects a second product from the swing selection device 6, and a dust exhaust fan 10 that sucks and discharges dust.

As shown in FIGS. 2 and 3, a plurality of straw cutting blades 4 are provided on the side opposite to the handle of the threshing device, and handle teeth 2a.
A straw cutting device B configured to be supported by a support frame 11 is provided in a state where the straw cutting device 2 is inserted into the turning loci of the handle teeth 2a from the outer side thereof. Next, the straw cutting device B will be described.

As shown in FIGS. 3, 4 and 5, the main body portions 4a of the straw cutting blades 4 are integrally formed one by one on opposite side walls of a plurality of U-shaped plate members 12, respectively. For each plate 12, the abrasion-resistant compound 5 is welded or sprayed to the inner surfaces of the both side walls, so that the compound 5 is located at the tip 4e of the blade 4b in a sectional view of the blade 4b. The outer surface of the plate member 12 is formed into a tapered inclined surface, and each plate member 12 is supported from the back side by the support frame 11 in a state where the outer surfaces of both side walls of the plate member 12 face each other.

The outer peripheral portion of the main body portion 4a, which serves as the blade portion 4b, is formed in a wave shape having a rake angle a with respect to the rotational direction. Examples of the compound 5 include vanadium alloy and ceramics. The compound 5 has a thickness of about 8 μm and a micro Vickers hardness of about 3200. Each plate member 12 is inserted through a plate member insertion hole formed in one side wall of the support frame 11 from the inner surface side and fixed with a bolt.

According to the above construction, as shown in FIG. 6 (a), the compound-side surface 4c which becomes the tip 4e of the blade 4b,
The surface is harder than the opposite surface 4d. Therefore, as the cutting work progresses, the opposite surface 4d wears first, and the compound 5 side surface 4c wears after this. That is, as shown in FIG. 6B, the thin compound 5 always has a sharp tip 4e, and the compound 5 always projects from the opposite surface 4d. As a result, even if the blade portion 4b is worn, the sharp tip 4e is always maintained, so that the sharpness is not deteriorated.

Incidentally, as shown in FIG. 7 (a), when the compound 5 is welded or sprayed only on the side of the tapered inclined surface, as shown in FIG. As the cutting work progresses, the surface of the side where the compound is not welded or sprayed wears first, and the surface of the side of compound 5 wears after this, and the blade part moves from the tip side. Although it wears first and the sharpness decreases, as described above, the present invention does not have such a problem.

[Other Embodiments] For each of the plate members 12, the wear-resistant compound 5 is welded or sprayed to the outer surfaces of the both side walls, and the compound 5 is attached to the blade part 4b in a sectional view of the blade part 4b.
The inner surfaces of the both side walls may be formed into a tapered inclined surface so as to be located at the tip of the.

The compound 5 may be deposited or sprayed on the inner and outer surfaces of the both side walls other than the tapered inclined surface.

The straw cutting blades 4 may be separately formed one by one.

In the above embodiment, the outer peripheral blade portion 4b is formed in a wave shape, but it may be a simple flat plate shape.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configuration of the accompanying drawings by this entry.

[Brief description of drawings]

1 is a vertical side view of the threshing device.

FIG. 2 is a vertical sectional front view of the threshing device.

[Fig. 3] Side view around the handling cylinder

FIG. 4 is a front view of a straw cutting blade.

5 is a V-V view of FIG. 4.

[Fig. 6] (a) Diagram showing a state before wear of the straw cutting blade (b) Diagram showing a state of wear of the straw cutting blade

FIG. 7 (a) is a diagram showing a state before wear of a straw cutting blade in a comparative example, and (b) is a diagram showing a state of wear of a straw cutting blade in a comparative example.

[Explanation of symbols]

 2a Handle tooth 4 Straw cutting edge 4a Body part 4b Blade part 4d Surface opposite to compound-existing side 5 Compound 11 Support frame 12 Plate material

Claims (2)

[Claims] 1. A plurality of straw cutting blades (4) are provided with handle teeth (2).
A straw cutting device for a threshing device supported by a support frame (11) in a state where they individually enter from the outer side of (a) into the turning loci of the handling teeth (2a), each straw cutting blade being The blade part (4) in the body part (4a) of (4)
The abrasion-resistant compound (5) is welded or sprayed onto one surface (4c) of (b), and the compound (5) is a tip ( 4e) is a straw cutting device of a threshing device in which the surface (4d) opposite to the side where the compound (5) is present is formed as a tapered inclined surface. 2. A plurality of straw cutting blades (4) are provided with handle teeth (2).
A straw cutting device for a threshing device supported by a support frame (11) in a state where they individually enter from the outer side of (a) into the turning loci of the handling teeth (2a), each straw cutting blade being The main body portion (4a) of (4) is integrally formed in pairs on opposite side walls of a plurality of U-shaped plate members 12, and each plate member 12 has an abrasion-resistant inner surface on both side walls. The compound (5) is welded or sprayed, and the compound (5) is applied to the tip (4) of the blade (4b) in a sectional view of the blade (4b).
e), the outer surfaces of the both side walls are formed into tapered surfaces, and the plate members (12) are placed in such a manner that the outer surfaces of the both side walls face each other.
The straw cutting device of the threshing device supported from the back side in 1).