Self-sharpening alloy pasture serrated knife

Abstract

A self-sharpening alloy pasture serrated knife belongs to the technical field of pasture machinery and comprises a knife body, a first reinforcing layer is arranged at the front end of the back of a cutting edge of the knife body, and a plurality of second reinforcing layers are evenly distributed on the back of the cutting edge of the knife body behind the first reinforcing layer. A sawtooth structure is formed after the cutter body cutting edges between the adjacent second reinforcing layers or between the second reinforcing layers and the adjacent first reinforcing layers are abraded. Through the novel design, the wear resistance and the cutting efficiency of the cut-off tool are integrally improved, and the characteristics of high efficiency and low resistance in the cutting process are also realized. The raw materials are saved, the power output of the harvesting machine is reduced, the replacement frequency of the cut-off tool is reduced, meanwhile, the method can be applied to other agricultural straw cut-off, smashing and mowing tools, and great social and economic benefits are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of forage machinery, and specifically relates to a self-sharpening alloy forage sawtooth knife. Background Art

[0002] At present, the mowing knives used in forage harvesting machinery and equipment at home and abroad are all made of pure steel. They cut the grass blades by contacting with the grass blades through high-speed rotation. The cutting knife is a flat plate structure and is heat-treated as a whole.

[0003] like Figure 1 The figure shows a schematic diagram of an existing mower blade, with the left side view being the front view and the right side view. The blade has no teeth and no reinforcement structure. After long-term operation, the cutting edge and the blade head wear out quickly, the blade head is rounded and the blade is blunt, so that the mower blade cannot cut the crop leaves. If it is not replaced in time after severe wear, other parts of the harvester will be damaged, affecting the quality of forage harvesting. Utility Model Content

[0004] In view of the problems of the prior art, the present invention discloses a self-sharpening alloy forage serrated knife, the purpose of which is to solve the following problems: after the existing mowing knife has been running for a long time, the cutting edge and the knife head will wear out quickly, the knife head will be rounded and the blade will be blunt, so that the mowing knife cannot cut the crop leaves. If it is not replaced in time after severe wear, other parts of the harvester will be damaged, affecting the quality of forage harvesting.

[0005] To achieve the above purpose, the technical solution of this novel invention is:

[0006] A self-sharpening alloy forage serrated knife comprises a knife body, wherein the front end of the back side of the knife body cutting edge is provided with a first strengthening layer, and a plurality of second strengthening layers are evenly distributed on the back side of the knife body cutting edge behind the first strengthening layer, and the knife body cutting edge between adjacent second strengthening layers or between the second strengthening layer and the adjacent first strengthening layer forms a serrated structure after being worn.

[0007] Preferably, the hardness of the blade edge is between 50-58HRC.

[0008] Preferably, the first strengthening layer is a tungsten carbide coating, and the second strengthening layer is an alloy layer.

[0009] Preferably, the first strengthening layer is a rectangular structure, the width h of the first strengthening layer is greater than the width of the front side of the blade edge, and the first strengthening layer extends toward the inside of the blade body on the basis of covering the back side of the front end of the blade edge.

[0010] Preferably, the length I of the first strengthening layer is 15 mm and the width h is 10 mm.

[0011] Preferably, the second strengthening layer is a plurality of rectangular strip structures arranged parallel to each other.

[0012] Preferably, the second strengthening layer is inclined toward a side away from the first strengthening layer, the inclination angle is 45 degrees, and the spacing between adjacent second strengthening layers is 5 mm.

[0013] Preferably, the length b of the second strengthening layer is 10-15 mm, and the width a is 2-3 mm.

[0014] Preferably, a pin hole is provided at one end of the blade body away from the first strengthening layer.

[0015] The beneficial effects of the new self-sharpening alloy grass sawtooth knife are:

[0016] 1. Conventional grass cutters rely on the sharp edge with hardness between 50-58HRC to cut the straw during rotation. They will be worn out after a short time and need to be replaced. The new type of grass cutter sprays tungsten carbide coating on the back of the two edges to maintain the original sharp edge between 50-58HRC while greatly improving the wear resistance life. The high density and high wear resistance of tungsten carbide are used to increase the life of the cutter by more than 2 times.

[0017] 2. When conventional cutting blades are rotating to cut straw, the front end of the blade forms an arc as the front end is constantly worn out, and the blade cannot cut grass and has to be replaced. The new blade has a first strengthening layer clad on the back of the front end of the blade to increase the life of the blade, and then several second strengthening layers are clad at equal intervals, which can further improve the wear resistance and service life of the blade.

[0018] 3. This new type also has a self-sharpening effect. After use, the metal edge of the blade wears quickly, while the alloy coating wears slowly, forming a serrated structure. The serrated principle is used to increase cutting efficiency and further extend the service life of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the structure of an existing lawn mower (the left side is a front view and the right side is a side view).

[0020] Figure 2 The figure is a schematic diagram of the structure of the present invention (the left figure is a front view and the right figure is a right view).

[0021] Figure 3 This is a schematic diagram of the sawtooth structure formed by the new cutting edge after wear.

[0022] 1. The front view structure of the blade; 2. The right view structure of the blade; 3. The front of the blade edge; 4. The back of the blade edge; 5. Pin hole; 6. The first strengthening layer; 7. The second strengthening layer; 8. Gap; 9. Tooth peak; 10. Tooth groove. DETAILED DESCRIPTION

[0023] The following 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 in the scope of protection of the present invention.

[0024] The following embodiments may be understood as a part of a local structure or method that is expressed separately in the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0025] Example 1

[0026] A self-sharpening alloy grass sawtooth knife, such as Figure 2 , 3 As shown, it includes a blade body, wherein the front end of the back side 4 of the blade edge is provided with a first strengthening layer 6, and a plurality of second strengthening layers 7 are evenly distributed on the back side 4 of the blade edge behind the first strengthening layer 6, and the blade edge between adjacent second strengthening layers 7 or between the second strengthening layer 7 and the adjacent first strengthening layer 6 forms a serrated structure after wear.

[0027] In this embodiment, the hardness of the blade can be significantly improved by providing the first strengthening layer and the second strengthening layer. At the same time, after the blade edge is worn, a serrated structure is formed at the blade edge of the blade, which can still ensure a sharp mowing effect.

[0028] Example 2

[0029] like Figure 2 , 3 As shown, the hardness of the blade edge of the blade body is between 50-58HRC, which is the same as the hardness of the lawn mower in the prior art and can ensure the sharpness of the blade edge.

[0030] like Figure 2 , 3 As shown, the first strengthening layer 6 is a tungsten carbide coating, and the second strengthening layer 7 is an alloy layer, both of which can be prepared by spraying or cladding.

[0031] In this embodiment, the function of the first strengthening layer is to increase the hardness of the blade to prevent it from being rounded during mowing, and the function of the second strengthening layer is to form a serrated structure after long-term wear.

[0032] Example 3

[0033] like Figure 2 As shown, the first strengthening layer 6 is a rectangular structure, the width h of the first strengthening layer 6 is greater than the width of the front edge 3 of the blade body, and the first strengthening layer 6 extends toward the inside of the blade body on the basis of covering the back of the front edge of the blade body.

[0034] Example 4

[0035] like Figure 2 As shown, the length I of the first strengthening layer 6 is 15 mm and the width h is 10 mm.

[0036] like Figure 2 As shown, the second strengthening layer 7 is a plurality of rectangular strip structures arranged parallel to each other.

[0037] Example 5

[0038] like Figure 2 As shown, the second strengthening layer 7 is inclined toward the side away from the first strengthening layer 6, the inclination angle is 45 degrees, and the spacing between adjacent second strengthening layers 7 is 5 mm.

[0039] like Figure 2 As shown, the length b of the second strengthening layer 7 is 10-15 mm, and the width a is 2-3 mm.

[0040] Example 6

[0041] like Figure 2 , 3 As shown, a pin hole is provided at one end of the blade body away from the first strengthening layer.

[0042] like Figure 3 The figure shows a schematic diagram of the sawtooth structure formed by the blade after wear. The above design can greatly improve the hardness of the blade body and extend the service life of the blade body. During the wear process, the blade edge sharpens itself into a sawtooth structure to ensure the mowing effect.

[0043] In summary, the new design improves the wear resistance and cutting efficiency of the cutting knife as a whole, and also realizes the characteristics of high efficiency and low resistance in the cutting process. It not only saves raw materials but also reduces the power output of the harvesting machinery and the frequency of replacing the cutting knife. At the same time, this method can be applied to other agricultural straw cutting, crushing and mowing knives, which has great social and economic benefits.

Claims

1. A self-sharpening alloy grass sawtooth knife, characterized by: The invention comprises a blade body, a first strengthening layer is arranged at the front end of the back of the blade edge, a plurality of second strengthening layers are evenly distributed on the back of the blade edge behind the first strengthening layer, and a sawtooth structure is formed after the blade edge between adjacent second strengthening layers or between the second strengthening layer and the adjacent first strengthening layer is worn.

2. A self-sharpening alloy grass serrated knife as claimed in claim 1, characterized in that: The hardness of the blade edge of the knife body is between 50-58HRC.

3. A self-sharpening alloy grass serrated knife as claimed in claim 1, characterized in that: The first strengthening layer is a tungsten carbide coating, and the second strengthening layer is an alloy layer.

4. The self-sharpening alloy grass sawtooth knife according to claim 1, characterized in that: The first strengthening layer is a rectangular structure, the width h of the first strengthening layer is greater than the width of the front edge of the blade body, and the first strengthening layer extends toward the inside of the blade body on the basis of covering the back of the front edge of the blade body.

5. A self-sharpening alloy grass serrated knife as claimed in claim 4, characterized in that: The length I of the first strengthening layer is 15 mm, and the width h is 10 mm.

6. The self-sharpening alloy grass sawtooth knife according to claim 1, characterized in that: The second strengthening layer is a plurality of rectangular strip structures arranged parallel to each other.

7. A self-sharpening alloy grass sawtooth knife as claimed in claim 6, characterized in that: The second strengthening layer is inclined toward the side away from the first strengthening layer, the inclination angle is 45 degrees, and the spacing between adjacent second strengthening layers is 5 mm.

8. A self-sharpening alloy grass sawtooth knife as claimed in claim 7, characterized in that: The length b of the second strengthening layer is 10-15 mm, and the width a is 2-3 mm.

9. A self-sharpening alloy grass sawtooth knife according to any one of claims 1 to 8, characterized in that: A pin hole is arranged at one end of the knife body away from the first strengthening layer.

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