JP2001028921A - Reaping blade device for combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise the strength and rigidity of double-type receiving blades, simplify the structure and reduce the manufacturing cost by forming receiving blades of a reaping blade device for a combine harvester into the double-type receiving blades in which lower receiving blades and upper receiving blades are integrally formed. SOLUTION: This reaping blade device 1 for a combine harvester is equipped with a receiving blade pedestal 2, plural receiving blades 3, plural reaping blades 4, a knife bar 5, etc., for fixing and supporting the reaping blades 4. An integral structure in which lower receiving blades 10 and upper receiving blades 11 are connected at the tips thereof is used as receiving blades 3 which are manufactured from a plate member made of steel. Mud removing holes 13 and 14 are respectively formed in the lower receiving blades 10 and the upper receiving blades 11 and the knife bar 5 is arranged on the upper surface side of the plural reaping blades 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine cutting blade device, and more particularly, to simplify the structure of a receiving blade while improving cutting performance by providing integrally formed lower and upper receiving blades as receiving blades. About things.

[0002]

2. Description of the Related Art Conventionally, a combine, which is a cutting device used for cutting rice and wheat, is provided with a cutting blade device at a lower portion of a front end thereof, and the cutting device is used to cut rice and wheat. ing. This cutting blade device is generally disposed so as to be detachably fixed to a combine machine frame, a plurality of receiving blades fixed to the receiving blade base, and slidably disposed on upper surfaces of the plurality of receiving blades. A plurality of cutting blades, a knife bar for fixedly supporting these cutting blades, several sets of knife grips for pressing these cutting blades from above so as not to float, a drive input unit for transmitting a driving force for reciprocating the knife bar left and right, and the like. It is configured.

[0003] By reciprocatingly driving the knife bar left and right with a driving force input from a drive input unit, a plurality of cutting blades are driven to shear left and right with respect to a plurality of receiving blades. The object to be cut is sheared and cut. In a conventional ordinary cutting blade device, the receiving blade is disposed below the cutting blade such that the cutting blade slides and moves on the upper surface of the receiving blade. Each cutting blade includes a mounting portion fixed to the knife bar, and a substantially triangular blade component extending toward the distal end of the mounting portion. Each of the receiving blades includes a mounting portion fixed to the blade base and a substantially triangular blade component extending toward the distal end of the mounting portion. Each receiving blade is formed in a single flat plate shape. It should be noted that jagged saws are formed on the inclined blades at the left and right ends of the cutting blade, and jagged saws are formed on the left and right ends of the receiving blade.

Here, if the knife grip is loosened during use for a long time and a gap is easily formed between the cutting blade and the receiving blade, an object to be cut such as rice or wheat is removed by the cutting blade and the receiving blade. As a result, the cutting performance of cutting by shearing is reduced, and the object to be cut is easily bitten between the cutting blade and the receiving blade. Therefore, for example, as shown in FIGS. 8 to 10, the lower receiving blade 51 located below the cutting blade 50 and the upper receiving blade 5 located above the cutting blade 50
A receiving blade 53 (hereinafter, referred to as a two-piece receiving blade) made of a cast product of ductile cast iron integrally formed with the two is also in practical use. The two-piece receiving blade 53 is formed as a narrow and thick arrow-shaped member having a sharpened tip, and the lower receiving blade 51 and the upper receiving blade 52 are integrally connected at a tip side portion, In order to ensure sufficient strength and rigidity, the lower receiving blade 51 is configured to have a sufficient thickness.

A plurality of cutting blades 50 are fixed by rivets to a knife bar (not shown) abutting on the lower surfaces thereof. Has a recess 51a. And
Each double blade 53 is fixed to the blade base with rivets or bolts and nuts. However, since the width of the double blade 53 is small, each double blade 53 is attached to two rivets. It cannot be fixed by restricting rotation. Therefore, the two receiving blades 53 are integrated into the receiving blade unit 56 via the connecting portions 54 and 55, and the receiving blade unit 56 is fixed to the receiving blade base with two rivets or bolts and nuts. Structure is adopted.

[0006]

[Problems to be Solved by the Invention] Conventional Double-Type Receiving Blade 5
3 is a cast product of a heavy and complicated-shaped ductile cast iron due to the formation of the concave portion 51a for the knife bar and the formation of the connecting portions 54 and 55, and the production cost is extremely high. . Further, since it is a cast product, casting defects and the like may remain inside. In such a case, if the double blade 53 is hit against a concrete ridge or the like in a rice field, the double impact is caused by the impact. There is also a problem that the receiving blade 53 is easily damaged, and the subsequent cutting operation is supported. SUMMARY OF THE INVENTION It is an object of the present invention to provide a combine cutting blade device having a two-piece receiving blade excellent in strength and rigidity, to simplify the structure of the two-piece receiving blade and to reduce the manufacturing cost. And making it difficult for mud to adhere to the upper surface of the shaped receiving blade.

[0007]

According to a first aspect of the present invention, there is provided a combine cutting blade device comprising: a plurality of receiving blades; and a plurality of cutting blades that cooperate with the receiving blades to cut a cutting object. In the cutting blade device, each receiving blade is provided with a receiving blade lower and a receiving blade upper opposed vertically with a gap through which the cutting blade can pass,
The lower receiving blade is disposed below the cutting blade so as to be in sliding contact with the lower surface of the cutting blade, and the upper receiving blade is disposed above the upper surface of the cutting blade. Is formed in a substantially triangular shape in plan view in which the width becomes narrower toward the tip side in the cutting progress direction, and each receiving blade is formed by punching a steel plate material and bending the distal end portion into a U-shape. The lower part and the upper part of the receiving blade are integrally connected at their tips.

For example, a case where rice is harvested will be described as an example. When a plurality of cutting blades are reciprocated right and left with respect to a plurality of receiving blades at the time of cutting, the rice is cut by each cutting blade. The cutting blade is pressed against the lower end and the side edge on the receiving blade, and the cutting blade cuts the rice by a shearing action with the lower part of the receiving blade. Since the rice is cut while supporting the upper and lower portions of the target portion for cutting rice under the receiving blade and above the receiving blade, cutting performance is remarkably improved. In particular, the cutting performance hardly decreases even in a state where a gap is formed between the cutting blade and the upper surface below the receiving blade.

The blade-constituting portion under the receiving blade and the upper portion of the receiving blade are formed in a substantially triangular shape in a plan view in which the width becomes narrower toward the leading end side in the cutting progress direction, so that the strength and rigidity of the receiving blade can be secured.
The effect of pushing rice on both sides of the receiving blade is obtained. The receiving blade is made by stamping a steel plate and bending the tip into a U-shape. The lower and upper receiving blades are integrally connected at their tips, so the structure of the receiving blade is simple. Thus, the receiving blade can be manufactured at a significantly lower cost (compared with a ductile cast iron casting) using a steel plate material as a material. Further, since the steel plate is manufactured as a raw material, no internal defects remain on the receiving blade, so that the receiving blade is hardly damaged and has excellent durability.

In a second aspect of the present invention, in the first aspect of the present invention, a metal sharp member having a sharp portion having a sharp tip is fixed to the tip of each of the receiving blades. Things. The lower part of the receiving blade and the upper part of the receiving blade are integrally connected at their tips, and in order to secure the connection strength between the lower receiving blade and the receiving blade, the connecting part has a structure with a predetermined width. There is a need. However, since a metal sharp member having a sharp point at the tip is fixed to the tip of the receiving blade, it is possible to further improve the performance of pushing a cutting object such as rice during cutting. As described above, since the sharp member is provided, the width of the connecting portion between the lower part of the receiving blade and the tip part on the receiving blade can be formed to some extent, and in terms of manufacturing the receiving blade and securing the strength of the receiving blade. It is advantageous.

According to a third aspect of the present invention, there is provided a combine cutting blade device according to the first or second aspect of the present invention, wherein a mud removing hole is formed below and above the receiving blade of each of the receiving blades. It is characterized by the following. Since the lower part of the blade and the upper part of the receiving blade have a substantially triangular shape in plan view that becomes narrower toward the tip end in the direction of cutting, the lower part of the blade and the upper part of the receiving blade have mud. Is easy to adhere, so the lower part of the receiving blade and the upper part of the receiving blade
Each of the mud holes for mud removal is formed. Therefore, it is possible to reduce the amount of mud adhering to those upper surfaces, make it less likely to become dirty, and prevent the generation of rust.

According to a fourth aspect of the present invention, there is provided a combine cutting blade device according to any one of the first to third aspects, wherein a knife bar for fixing and supporting the plurality of cutting blades is provided on an upper surface of the plurality of cutting blades. It is characterized by having been done. Since the knife bar for fixedly supporting the plurality of cutting blades is arranged on the upper surface of the plurality of cutting blades, there is no need to form a recess under the receiving blade to avoid interference with the knife bar, and the structure under the receiving blade is not required. Can be simplified.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a combine cutting blade device 1 is used to cut, for example, two or three rice plants at a time, and is used in a state where it is mounted on a front end portion of a combine machine frame. The cutting blade device 1 includes a receiving blade base 2 elongated in the left-right direction, a plurality of (for example, 17) receiving blades 3 fixed to the receiving blade table 2, a plurality of (for example, 16) cutting blades 4, and these cutting blades. A knife bar 5 disposed on the upper surface of the cutter blade 4 and fixedly supporting the cutting blades 4, four sets of knife grips 6 for elastically pressing the knife bar 5, and a driving force generated by a drive unit of the combine which is connected to the knife bar 5 and inputted. And a drive input unit 7 for performing the operation.

As shown in FIG. 1 and FIG. 2, the receiving blade base 2 is a member made of a steel plate having a predetermined front-rear width and elongated in the left-right direction, and has a flange portion 2a formed at the rear end for increasing rigidity. The receiving table 2 is detachably fixed to a lower portion of the front end of the machine frame of the combine. As shown in FIGS.
Each receiving blade 3 has a lower receiving blade 10 and an upper receiving blade 11 that are vertically opposed to each other with a gap through which the cutting blade 4 can pass.
Has a mounting portion 10a fixed to the receiving blade base 2 with two rivets 12 or bolts and nuts, and a blade component 10b extending forward of the mounting portion 10a, and has a flat plate shape. Under the receiving blade 10
The cutting blade 4 is disposed below the cutting blade 4 so as to be in sliding contact with the lower surface of the cutting blade 4, and the upper receiving blade 11 is disposed above the upper surface of the cutting blade 4.

The upper receiving blade 11 is formed to have a size that is located above about 3/4 of the front side of the blade forming portion 10b. It is formed in a substantially triangular shape in a plan view in which the width becomes narrower toward the front end side. In each receiving blade 3, the lower receiving blade 10 and the upper receiving blade 11 are integrally connected at their tip portions 3a, and each receiving blade 3 has a U-shaped tip portion after punching a tool steel plate material for a cutting tool. It is bent. A heat treatment for increasing the toughness of the tip 3a of the receiving blade 3 is performed.
In addition, in order to increase the surface area of the blade to make it less likely to wear, to prevent the cutting performance from deteriorating when worn, and to prevent the cutting object from slipping, the left and right ends of the blade forming portion 10b and the receiving blade upper 11 are removed. Has a fine jagged saw-tooth pattern.

In order to reduce the amount of mud adhering to the upper surfaces of the lower receiving blade 10 and the upper receiving blade 11, a trapezoidal mud removing device is provided at substantially the center of the lower receiving blade 10 in the left-right direction and the front-back direction. Mud hole 13
Similarly, a trapezoidal mud draining hole 14 is formed substantially at the center of the upper side of the receiving blade 11 in the left-right direction and the front-back direction. Each cutting blade 4 is manufactured by punching and cutting a tool steel plate material for a cutting tool in the same manner as the receiving blade 3, and each cutting blade 4 has a shape substantially similar to that of the lower receiving blade 10. An attachment portion 16 fixed by two rivets 15 or bolts and nuts, and a blade component portion 17 extending forward of the attachment portion 16
And a plate shape. An inclined blade portion 17a is formed at both left and right end portions of the blade forming portion 17, and the same fine jagged sawtooth as described above is formed on the inclined blade portion 17a.

As shown in FIGS. 1 and 2, a knife grip 6 made of a leaf spring material is fixed to a fixing portion 6 fixed to the blade holder 2.
a and a pressing portion 6b that curves from the fixing portion 6a and extends forward. The fixing portion 6a of the knife grip 6 is fixed to the blade base 2 with two bolts 18, and a central bolt 19 having a head held by the blade base 2 has a fixing portion 6a and a holding portion 6b.
The upper surface of the pressing portion 6b is pressed by a nut 19a screwed to the upper end of the bolt 19, and the cutting blade 4 is elastically pressed by the tip of the pressing portion 6b.

However, in the case of the present embodiment, a guide piece 6c is fixed to the tip of the holding portion 6b, and the guide piece 6c contacts the front end of the knife bar 5 to guide the front end of the knife bar 5. The locking piece 20 provided on the bolt 19 is brought into contact with the rear end of the knife bar 5 between the fixing portion 6a and the holding portion 6b to guide the rear end of the knife bar 5. The knife bar 5 can reciprocate left and right between the guide piece 6c and the locking piece 20. The guide piece 6c
May be formed integrally by bending the front end of the holding portion 6b, or by welding the guide piece 6c to the front end of the holding portion 6b separately from the holding portion 6b. It may be composed of fixed parts.

The operation of the combine cutting blade device 1 described above will be described. To explain the case of harvesting rice as an example, at the time of harvesting, a reciprocating driving force is input to the drive input unit 7 by the drive crankshaft of the combine, and the plurality of cutting blades 4 are predetermined to the left and right via the knife bar 5. 5 (e.g., 50 mm) reciprocating drive, as shown in FIG. 5, the rice is pressed by the respective cutting blades 4 to the side edges of the lower receiving blade 10 and the upper receiving blade 11, and the cutting blade 4 is moved downward. The rice is cut by a shearing action with No. 10. Lower receiving blade 10 and upper receiving blade 11
In this way, the rice is cut while supporting the upper and lower portions of the target portion for cutting rice, so that the cutting performance is remarkably improved. In particular, even in a state where a gap is formed between the cutting blade 4 and the upper surface of the lower receiving blade 10, the cutting performance hardly decreases.

The blade component 10b of the lower receiving blade 10 and the upper receiving blade 11
Has a generally triangular shape in plan view, the width of which becomes narrower toward the tip end in the cutting progress direction.
Strength and rigidity can be secured, and the action of pushing rice on both sides of the receiving blade 3 can also be secured. The receiving blade 3 is formed by punching a tool steel plate material for a cutting tool and bending the distal end portion 3a into a U-shape, and the lower receiving blade 10 and the upper receiving blade 11 are integrally connected at their distal ends. The structure of the receiving blade 3 is also simple, and the receiving blade 3 can be manufactured at extremely low cost using a steel plate material as a material. Since the steel plate material is used as a material, no internal defects remain in the receiving blade 3, so that the receiving blade 3 is hardly damaged and has excellent durability.

The lower receiving blade 10 and the upper receiving blade 11 of each of the receiving blades 3 have a flat plate shape, so that mud easily adheres to the blade constituting portion 10b and the upper receiving blade 11 of the lower receiving blade 10. In the lower receiving blade 10 and the upper receiving blade 11 of each receiving blade 3, a mud removing hole 13, 1 for removing mud is provided.
4 were each formed. As a result, it is possible to reduce the amount of mud adhering to the upper surfaces thereof, make it less likely to become dirty, and prevent the generation of rust. Since the knife bar 5 for fixing and supporting the plurality of cutting blades 4 is disposed on the upper surface of the plurality of cutting blades 4, it is not necessary to form a recess in the lower receiving blade 10 to avoid interference with the knife bar 5. Thus, the structure of the lower receiving blade 10 can be simplified.

Next, a modified example in which the receiving blade 3 is partially modified will be described. 1] As shown in FIGS. 6 and 7, this receiving blade 3A also has a lower receiving blade 10A and an upper receiving blade 1A.
1A is a structure integrally connected at their tip portions 3a. In order to secure the connection strength between the lower receiving blade 10A and the upper receiving blade 11A, the distal end portion 3a needs to have a structure having a predetermined width. is there. Therefore, the blade component 10b of the lower receiving blade 10A
The width of the base end is slightly reduced, and the tip 3
The width of “a” is made a little larger, and a metal sharp member 22 having a sharp portion with a sharp tip is fixed to the tip of each receiving blade 3. The sharp member 22 is made of, for example, cast steel, and is fixed to the tip of the receiving blade 3 by welding a welding portion 23.

Since the sharp member 22 is provided, the performance of pushing the object to be cut, such as rice, at the time of cutting can be further enhanced. As described above, since the sharp member 22 is provided, the width of the connecting portion between the distal end of the lower receiving blade 10A and the distal end of the upper receiving blade 11A can be formed to a certain extent, and the manufacturing of the receiving blade 3A also requires the receiving blade 3A. This is advantageous in securing strength and durability. Since the sharp member 22 is small, the manufacturing cost is low, and the provision of the sharp member 22 does not necessarily increase the manufacturing cost of the receiving blade 3A. The sharp member 22 is not limited to cast steel, but may be cast iron, or may be manufactured by forming a steel plate.

2] The inclination angle of the line at the side end of the receiving blades 3 and 3A is not limited to the angle of the above-described embodiment.
The shapes of the mud holes 13 and 14 are not limited to those of the embodiment. In addition, without departing from the spirit of the present invention, the cutting blade device according to the above-described embodiment can be embodied with various modifications.

[0025]

As described above, according to the first aspect of the present invention, the rice is cut while supporting the upper and lower portions of the target portion for cutting rice under the receiving blade and above the receiving blade. Dramatically improved. In particular, the cutting performance hardly decreases even in a state where a gap is formed between the cutting blade and the upper surface below the receiving blade. The lower blade-constituting portion and the upper portion of the receiving blade are formed in a substantially triangular shape in plan view that becomes narrower toward the leading end side in the cutting progress direction, so that the strength and rigidity of the receiving blade can be secured, and The action of pushing the rice on both sides can be secured. The receiving blade is made by stamping a steel plate and bending the tip into a U-shape. The lower and upper receiving blades are integrally connected at their tips, so the structure of the receiving blade is simple. Thus, the receiving blade can be manufactured at a significantly lower cost (compared with a ductile cast iron casting) using a steel plate material as a material. Since the steel plate is manufactured as a material, no internal defects remain on the receiving blade, so that the receiving blade can be hardly damaged and has excellent durability.

According to the invention of claim 2, at the tip of the receiving blade,
Since the metal sharp member having the sharp portion that is sharp at the tip is fixed, the performance of pushing the object to be cut, such as rice, at the time of cutting can be further enhanced. As described above, since the sharp member is used, the width of the connecting portion between the lower part of the receiving blade and the tip part on the receiving blade can be formed to a certain extent, and in terms of manufacturing the receiving blade and securing the strength of the receiving blade. It is advantageous in terms of. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, since the mud removing holes are formed below and above the receiving blade of the receiving blade, the amount of mud adhering to these upper surfaces is reduced. , Making it difficult to stain and preventing the generation of rust. The other effects are the same as those of the first or second aspect.

According to the fourth aspect of the present invention, since the knife bar for fixing and supporting the plurality of cutting blades is disposed on the upper surface of the plurality of cutting blades, it is possible to avoid interference with the knife bar below the receiving blade. There is no need to form a recess, and the structure below the receiving blade can be simplified. Other effects similar to those of any one of the first to third aspects are exhibited.

[Brief description of the drawings]

FIG. 1 is a plan view of a combine cutting blade device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged plan view of a receiving blade.

FIG. 4 is an enlarged side view of the receiving blade.

FIG. 5 is an explanatory view showing a state where rice is cut by a cutting blade and a receiving blade.

FIG. 6 is an enlarged plan view of a receiving blade according to a modified example.

FIG. 7 is an enlarged side view of the receiving blade of FIG. 6;

FIG. 8 is a plan view of a main part of a conventional combine blade device.

FIG. 9 is a plan view of a receiving blade unit in which two two-sheet receiving blades are connected to one set.

FIG. 10 is a side view of the receiving blade unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting blade device for combine 3, 3A Receiving blade 4 Cutting blade 5 Knife bar 10 Lower receiving blade 11 Upper receiving blade 13, 14 Mud removal hole 22 Sharp member

Claims (4)

[Claims] 1. A combine cutting blade device comprising a plurality of receiving blades and a plurality of cutting blades for cooperating with the receiving blades to cut the object to be cut. It has a lower receiving blade and an upper receiving blade which are vertically opposed with a possible gap, and the lower receiving blade is disposed below the cutting blade so as to be in sliding contact with the lower surface of the cutting blade. The upper blade is disposed above the upper surface of the blade, and the lower blade-constituting portion and the upper portion of the receiving blade are formed in a substantially triangular shape in plan view such that the width becomes narrower toward the tip end in the direction of the cutting progress. A cutting blade device for a combine, wherein a cutting end is bent into a U-shape after punching a plate material, and a lower part of the receiving blade and an upper part of the receiving blade are integrally connected at their distal ends. 2. A combine cutting blade device according to claim 1, wherein a sharp member made of metal having a sharp portion as sharp as the tip is fixed to the tip of each of the receiving blades. 3. The cutting blade device for a combine according to claim 1, wherein a mud draining hole is formed below and above the receiving blade of each of the receiving blades. 4. The combine cutting blade according to claim 1, wherein a knife bar for fixing and supporting said plurality of cutting blades is disposed on an upper surface of said plurality of cutting blades. Blade device.