A type of grain stalk cutting blade

Abstract

A moving blade for cutting grain stalks, relating to the field of agricultural harvester technology, includes a blade body with a triangular cutting section at the front end and a rectangular connecting section at the rear end. The cutting section has blades on both sides, and a boss structure is provided on the back of each blade along its direction. Several teeth are evenly arranged on the front of each blade, with the outer ends of the teeth extending to the outer ends of the bottom of the boss structure and coplanar with the outer surface of the boss structure. This invention can further improve the structural strength, wear resistance, cutting effect, and service life of the moving blade, while reducing its weight and saving costs while ensuring cutting performance. It also includes a discharge hole for removing debris from the blade body, with a cutting edge on the inner edge of the discharge hole for secondary cutting of the debris. The improved tooth structure effectively avoids the risk of tooth breakage.

Description

Technical Field

[0001] This invention relates to the field of agricultural harvester technology, specifically to a moving blade for cutting grain stalks. Background Technology

[0002] Patent document CN220279717U discloses an alloy moving blade for a cutter, including a blade body. The blade body includes a connecting part and a cutting part integrally formed on the upper end of the connecting part and extending upward. The cutting part has a triangular structure, with the base of the triangle overlapping the top edge of the connecting part. Two sides of the triangle are provided with cutting edges. The outer surface of the cutting edges is prepared with several evenly arranged teeth using a cold extrusion technique. Each tooth is coated with a tungsten carbide coating using an ultrasonic spraying device. This novel design improves the wear resistance and structural strength of the moving blade, reducing the frequency of blade replacement. The tungsten carbide coating is located on the front side of the teeth, while the back side of the teeth is uncoated, forming a sharp, self-sharpening edge during the wear process.

[0003] However, this new type also has the following drawbacks:

[0004] (1) The blade is relatively thin and has low structural strength, which poses a risk of chipping during use.

[0005] (2) Debris (such as straw leaves) often falls off the blade. The moving blade has no function to discharge debris and cannot cut the debris a second time, which can easily lead to the accumulation of debris and enter the harvester along the blade, causing the equipment to run poorly.

[0006] (3) The blade is heavy and its overall strength needs to be further improved. Utility Model Content

[0007] This invention discloses a moving blade for cutting grain stalks, with the aim of solving the problems existing in the prior art mentioned in the background section.

[0008] To achieve the above objectives, the technical solution of this invention is as follows:

[0009] A grain stalk cutting blade includes a blade body with a triangular cutting section at the front end and a rectangular connecting section at the rear end. The cutting section has blades on both sides, and the back of the blades has a boss structure along the direction of the blades. The front of the blades has a number of uniformly arranged teeth, and the outer ends of the teeth extend to the outer ends of the bottom of the boss structure and are coplanar with the outer surface of the boss structure.

[0010] Preferably, the blade body is made of alloy steel, and the front side of the blade is coated with tungsten carbide.

[0011] Preferably, the rear part of the blade body is provided with an assembly hole for connecting with a harvester, and the middle part of the blade body is provided with a discharge hole.

[0012] Preferably, the discharge hole is triangular, with the base of the triangle parallel to the rear end of the connecting part, the two sides of the triangle parallel to the corresponding cutting part sides, and the inner edge of the triangle having a cutting edge for secondary cutting of debris.

[0013] Preferably, the rear end of the blade body is provided with a weight reduction groove.

[0014] Preferably, the weight-reducing groove is a trapezoidal groove, and the two inner corners of the trapezoidal groove are rounded.

[0015] Preferably, adjacent cutting teeth form a tooth groove, and the radius of the tooth groove is R = 0.3-0.5; the radius of the cutting tooth tip is R = 0.3-0.5.

[0016] Preferably, the included angle A between the opposing sidewalls of adjacent cutting teeth is 35°, the outer wall of the cutting teeth facing the sharp corner of the cutting part forms a plane B, the included angle D between the edge line of the outer end of plane B and the line C connecting the outer end sharp corners of several cutting teeth on the same side is 44.5°, and the included angle E between the line C and the inner end edge line of the outer surface of the cutting teeth facing the connecting part is 100.5°.

[0017] Preferably, the angle F between the extension line of the tip edge of the blade tooth and the bottom of the boss structure is 24°±1°.

[0018] Preferably, the width of the boss structure is 4.8±0.2mm, the height of the boss structure from the back of the blade body is 0.5±0.1mm, and the thickness of the cutting part is 2.8mm.

[0019] The novel grain stalk cutting blade has the following beneficial effects:

[0020] This new design can further improve the structural strength, wear resistance, cutting effect, and service life of the moving blade. It can also reduce the weight of the moving blade while ensuring the cutting effect, thus saving economic costs. The design of the R-angle of the blade teeth can eliminate the sharp corner effect and prevent tooth breakage. At the same time, it is equipped with a discharge hole to discharge debris from the blade body. The inner edge of the discharge hole is equipped with a cutting edge to perform secondary cutting of debris. Through the improvement of the blade tooth structure, the risk of tooth breakage is effectively avoided. Attached Figure Description

[0021] Figure 1 A top view of the structure of this novel invention;

[0022] Figure 2 A schematic diagram of the cross-sectional structure of this novel structure along the AA direction;

[0023] Figure 3 A schematic diagram of the novel structure viewed from below.

[0024] The markings in the diagram are: 1. Connecting part; 2. Cutting part; 3. Cutting edge; 4. Assembly hole; 5. Angle E; 6. Discharge hole; 7. Angle A; 8. Angle D; 9. Tooth groove; 10. Cutting tooth; 11. Weight reduction groove; 12. Boss structure; 13. Angle F. Detailed Implementation

[0025] The following is a detailed description of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this invention.

[0027] The following embodiments can be understood as explaining the structural performance of a part of the present invention individually, or they can be understood as being combined with other embodiments to explain the structural characteristics of the present invention over a wider range.

[0028] Example 1

[0029] A type of grain stalk cutting blade, such as Figure 1-3 As shown, the blade body includes a cutting section 2 with a triangular front end and a rectangular connecting section 1 with a rectangular rear end; the cutting section has blades on both sides, and a boss structure 12 is provided on the back of the blade along the direction of the blade; a number of blade teeth 10 are evenly arranged on the front of the blade, and the outer ends of the blade teeth 10 extend to the outer ends of the bottom of the boss structure 12 and are coplanar with the outer surface of the boss structure 12.

[0030] In this embodiment, the boss structure is formed by die stamping. By setting the boss structure, the thickness of the blade can be significantly increased, thereby strengthening the structural strength and wear resistance of the blade and extending the service life of the blade. At the same time, the blade teeth extend to the bottom of the boss structure, which can ensure the cutting effect on straw.

[0031] Example 2

[0032] like Figure 1As shown, the blade body is made of alloy steel, and the front of the blade edge is coated with tungsten carbide. The alloy steel can be 75Cr1. This design improves both wear resistance and the toughness of the blade body, preventing tooth breakage.

[0033] Example 3

[0034] like Figure 1 As shown, the rear of the blade body is provided with an assembly hole 4 for connecting with a harvester, and the middle of the blade body is provided with a discharge hole 6.

[0035] like Figure 1 , 3 As shown, the discharge hole 6 is triangular, with the base of the triangle parallel to the rear end of the connecting part, and the two sides of the triangle parallel to the corresponding cutting part sides. The inner edge of the triangle is provided with a cutting edge 3 for secondary cutting of debris.

[0036] In this embodiment, the discharge hole can reduce the weight of the blade body on the one hand, and allow debris that impacts the blade body to pass through on the other hand, preventing it from entering the harvester and causing operational obstruction. At the same time, the inner edge of the discharge hole is a cutting edge, which can perform secondary cutting of straw leaves and other debris, which is conducive to the fermentation of crop debris in the soil.

[0037] Example 4

[0038] like Figure 1 , 3 As shown, the rear end of the blade body is provided with a weight reduction groove 11.

[0039] like Figure 1 , 3 As shown, the weight-reducing groove 11 is a trapezoidal groove, and the two inner corners of the trapezoidal groove are rounded.

[0040] In this embodiment, the weight of the blade body is further reduced by setting a weight reduction groove, and the weight reduction groove is located on the rear side of the mounting hole 4, so it will not affect the working performance of the blade body.

[0041] Example 5

[0042] like Figure 1 As shown, adjacent cutting teeth 10 form a tooth groove 9, and the radius of the tooth groove 9 is R = 0.3-0.5; the radius of the top of the cutting tooth 10 is R = 0.3-0.5, and the cutting tooth is formed in one step by a stamping die.

[0043] like Figure 1As shown, the included angle A7 between the opposite sidewalls of adjacent blades 10 is 35°. Compared to a larger angle, this setting makes it easier for the straw to be inserted between the blades for cutting. The outer wall of the blade 10 facing the sharp corner of the cutting part forms a plane B. The included angle D8 between the edge line of the outer end of plane B and the line C connecting the outer sharp corners of several blades 10 on the same side is 44.5°. The included angle E5 between the line C and the inner edge line of the outer surface of the blade facing the connecting part is 100.5°. This setting helps to increase the structural strength of the blades, improve cutting efficiency, and reduce the risk of tooth breakage.

[0044] Example 6

[0045] like Figure 2 As shown, the angle F13 between the extension line of the top edge of the blade tooth and the bottom of the boss structure is 24°±1°.

[0046] like Figure 2 As shown, the width L of the boss structure 12 is 4.8±0.2mm, the height of the boss structure 12 from the back of the blade body is 0.5±0.1mm, and the thickness H of the cutting part is 2.8mm.

[0047] This embodiment provides detailed structural data of the cutting teeth. While ensuring cutting efficiency, the increased thickness of the cutting teeth helps to enhance the strength and wear resistance of the cutting teeth, and extend the service life of the blade body.

Claims

1. A moving blade for cutting grain stalks, characterized in that: The blade body includes a cutting section with a triangular front end and a rectangular connecting section with a rectangular rear end. The cutting section has blades on both sides, and a boss structure is provided on the back of the blade along the direction of the blade. Several blade teeth are evenly arranged on the front of the blade, and the outer ends of the blade teeth extend to the outer ends of the bottom of the boss structure and are coplanar with the outer surface of the boss structure.

2. The grain stalk cutting blade as described in claim 1, characterized in that: The blade body is made of alloy steel, and the front of the blade is coated with tungsten carbide.

3. The grain stalk cutting blade as described in claim 2, characterized in that: The blade body has an assembly hole at the rear for connecting to a harvester, and a discharge hole at the middle of the blade body.

4. The grain stalk cutting blade as described in claim 3, characterized in that: The discharge hole is triangular, with the base of the triangle parallel to the rear end of the connecting part, and the two sides of the triangle parallel to the corresponding cutting part sides. The inner edge of the triangle is provided with a cutting edge for secondary cutting of debris.

5. A grain stalk cutting blade as described in claim 4, characterized in that: The blade body has a weight reduction groove at its rear end.

6. A grain stalk cutting blade as described in claim 5, characterized in that: The weight-reducing groove is a trapezoidal groove, and the two inner corners of the trapezoidal groove are rounded.

7. A grain stalk cutting blade as described in claim 6, characterized in that: The adjacent cutting teeth form a tooth groove, and the radius of the tooth groove is R = 0.3-0.5; the radius of the cutting tooth tip is R = 0.3-0.

5.

8. A grain stalk cutting blade as described in claim 7, characterized in that: The included angle A between the opposing sidewalls of adjacent cutting teeth is 35°. The outer wall of the cutting teeth facing the sharp corner of the cutting part forms a plane B. The included angle D between the edge line of the outer end of plane B and the line C connecting the sharp corners of the outer ends of several cutting teeth on the same side is 44.5°. The included angle E between the line C and the edge line of the inner end of the outer surface of the cutting teeth facing the connecting part is 100.5°.

9. A grain stalk cutting blade as described in claim 8, characterized in that: The angle F between the extension line of the tip edge of the blade tooth and the bottom of the boss structure is 24°±1°.

10. A grain stalk cutting blade as described in claim 9, characterized in that: The width of the boss structure is 4.8±0.2mm, the height of the boss structure from the back of the blade body is 0.5±0.1mm, and the thickness of the cutting part is 2.8mm.

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