Self-sharpening lawn mower wear blade

Abstract

The utility model relates to a self-sharpening lawn mower wear -resisting blade, belongs to the technical field of cutting tools, including blade body, the middle part of blade body is equipped with the mounting hole for connecting with the lawn mower, to the rotating direction of blade body work as the positive direction, the positive end of blade body of the two sides of mounting hole is equipped with blade edge respectively, the end of blade body opposite to blade edge is equipped with the wing tail that pries up to the upward, the wing tail and blade body form the bending line between, the upper surface of blade edge, the upper surface of bending line place and wing plate upper surface all are equipped with multistage wear -resisting coating strip, the utility model can effectively improve the wear resistance of lawn mower blade, prolongs the service life, reduces the production cost, improves the safety performance of use, improves the performance -price ratio of product, satisfies the use need of customer.

Description

Technical Field

[0001] This invention belongs to the field of cutting tool technology, specifically relating to a self-sharpening, wear-resistant blade for lawn mowers. Background Technology

[0002] Lawn mowers are widely used garden trimming equipment, used to mow lawns in homes or commercial settings to maintain a clean living environment. Lawn mowers can be categorized by their cutting method into rotary mowers, roller mowers, and swivel mowers. The blades of a rotary mower are the main working component; they use two centrally symmetrical blades at the tip to cut the grass stems during high-speed rotation.

[0003] Wear of rotary lawnmower blades is the main failure mode under normal operating conditions. Currently, the general solution for self-sharpening lawnmower blades is to use thermal spraying or laser coating to coat the lower surface of the blade edge with a wear-resistant alloy that is harder than the blade substrate. This can improve the wear resistance of the blade tip and the lower surface of the blade edge. The upper surface of the blade edge always wears faster than the lower surface, ensuring the sharpness of the blade edge at all times. This eliminates the need for manual blade sharpening and reduces blade maintenance costs.

[0004] Existing processes for addressing blade wear are simple but have several drawbacks: 1. The upper surface of the blade still experiences significant wear, making the process ineffective in extending the overall lifespan of the blade; 2. As the blade substrate wears, the cutting edge angle decreases, reducing blade strength and safety; 3. Blades produced using existing processes are often about three times more expensive than conventional blades without wear-resistant alloy coatings, but their overall lifespan is often less than three times that of conventional blades, making them less appealing to consumers; 4. Applying wear-resistant alloy to the lower surface of the blade leads to reduced blade strength and safety after the upper surface wears. Customers often worry about the blade breaking under extreme conditions and causing accidents, so they tend to replace it prematurely when it is completely worn, resulting in a shorter actual lifespan and further reducing its market popularity. Utility Model Content

[0005] This invention discloses a self-sharpening, wear-resistant blade for lawn mowers, which aims to solve the problems described in the prior art 1-4 mentioned in the background section.

[0006] To achieve the above objectives, the technical solution of this invention is as follows:

[0007] A self-sharpening, wear-resistant blade for lawn mowers includes a blade body with a mounting hole in the middle for connecting to a lawn mower. Taking the rotation direction of the blade body during operation as the positive direction, the positive ends of the blade body on both sides of the mounting hole are respectively provided with cutting edges. The end of the blade body opposite to the cutting edges is provided with an upward-curving wing tail, forming a bending line between the wing tail and the blade body. The upper surface of the cutting edge, the upper surface at the bending line, and the upper surface of the wing plate are all provided with multi-level wear-resistant coating strips.

[0008] Preferably, the wear-resistant coating strip is a wear-resistant alloy with a hardness higher than that of the blade substrate, which is coated on the blade surface by thermal spraying or laser coating processes.

[0009] Preferably, the multi-level wear-resistant coating strip includes multiple strip-shaped wear-resistant alloys parallel to the blade direction. The multiple strip-shaped wear-resistant alloys are arranged sequentially from the direction closest to the blade to the direction furthest from the blade, and the junctions of adjacent strip-shaped wear-resistant alloys overlap each other.

[0010] Preferably, among adjacent strip-shaped wear-resistant alloys, the strip-shaped wear-resistant alloy closer to the blade edge is a newly coated wear-resistant alloy, and the wear-resistant alloy farther from the blade edge is an old coated wear-resistant alloy. At the junction of adjacent strip-shaped wear-resistant alloys, the newly coated wear-resistant alloy presses down on the old coated wear-resistant alloy.

[0011] Preferably, on the upper surface of the blade, starting from the strip-shaped wear-resistant alloy near the blade edge, the length of the strip-shaped wear-resistant alloy decreases sequentially, and several strip-shaped wear-resistant alloys are aligned at one end near the blade body; on the upper surface of the bending line and the upper surface of the wing plate, starting from the strip-shaped wear-resistant alloy near the blade edge, the length of the strip-shaped wear-resistant alloy increases sequentially, and several strip-shaped wear-resistant alloys are aligned at one end near the blade body.

[0012] Preferably, the cross-section of each strip of wear-resistant alloy on the upper surface of the blade is an arc-shaped surface, which is used to maintain the inclination angle of the upper surface of the blade.

[0013] The beneficial effects of this new type of self-sharpening, wear-resistant blade for lawn mowers are as follows:

[0014] This new invention can effectively improve the wear resistance of lawnmower blades, extend their service life, reduce production costs, improve safety performance, enhance the cost-effectiveness of the product, and meet customer needs. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the main body of a self-sharpening, wear-resistant blade for a lawn mower;

[0016] Figure 2 This is a top view of a partial structure of a self-sharpening, wear-resistant blade for a lawn mower;

[0017] Figure 3 This is a cross-sectional view of the novel AA direction;

[0018] Figure 4 This is a magnified side view of a portion of the blade of this novel blade.

[0019] Markings in the diagram: 1. Blade tip; 2. Blade edge; 3. Mounting hole; 4. Wing tail; 5. Bending line; 6. First multi-level wear-resistant coating strip; 7. Second multi-level wear-resistant coating strip; 8. Third multi-level wear-resistant coating strip; 9. Back of the blade edge; 10. Direction of movement of grass blades and sand particles; 11. Semi-circular hole; 61. Strip-shaped wear-resistant alloy near the blade edge; 62. Strip-shaped wear-resistant alloy away from the blade edge; 63. Junction. Detailed Implementation

[0020] The following description is merely 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.

[0021] The following embodiments can be understood as a part of the local structure or method of the present invention, or as a combination of embodiments to explain the connotation of a larger range of structures or methods of the present invention.

[0022] This novel type of self-sharpening, wear-resistant blade for lawn mowers, such as... Figure 1-4 As shown, the blade body includes a mounting hole 3 in the middle for connecting to a lawnmower. With the rotation direction of the blade body during operation as the positive direction, the positive ends of the blade body on both sides of the mounting hole 3 are respectively provided with blades 2. The end of the blade body opposite to the blades 2 is provided with an upwardly curved wing tail 4. A bending line 5 is formed between the wing tail 4 and the blade body. The upper surface of the blades 2, the upper surface at the bending line 5, and the upper surface of the wing plate 4 are all provided with multi-level wear-resistant coating strips (6 / 7 / 8).

[0023] In this embodiment, as Figure 1-4 As shown, the wear-resistant coating strip is a wear-resistant alloy with a hardness higher than that of the blade substrate, which is coated on the blade surface by thermal spraying or laser coating processes.

[0024] In this embodiment, as Figure 1-4 As shown, the multi-level wear-resistant coating strip includes multiple strip-shaped wear-resistant alloys parallel to the blade 2 direction. The multiple strip-shaped wear-resistant alloys are arranged sequentially from the direction close to the blade 2 to the direction away from the blade 2, and the junctions of adjacent strip-shaped wear-resistant alloys overlap each other.

[0025] In this embodiment, as Figure 1-4As shown, among the adjacent strip-shaped wear-resistant alloys, the strip-shaped wear-resistant alloy 61 closer to the blade 2 is the newly coated wear-resistant alloy, and the wear-resistant alloy 62 farther from the blade is the old coated wear-resistant alloy. At the junction 63 of the adjacent strip-shaped wear-resistant alloys, the newly coated wear-resistant alloy presses down on the old coated wear-resistant alloy.

[0026] In this embodiment, as Figure 4 As shown, the cross-section of each strip of wear-resistant alloy on the upper surface of the blade 2 is an arc-shaped surface, which is used to maintain the inclination angle of the upper surface of the blade 2.

[0027] The working principle of this new type:

[0028] 1. This new design provides comprehensive protection for the main wear-prone areas of the blade, improving its wear resistance. It not only protects the worn cutting edge but also the tail fin and tail fin bend line (the blade, tail fin, and bend line are the main failure points), further extending the blade's service life.

[0029] 2. For example Figure 2 As shown, for protecting the blade edge, the coating length is increased at the very tip where it first contacts the grass blades, which is where wear is most intense. The coating length is decreased in areas where there is less impact from grass blades and sand, meaning areas with less wear, ultimately saving on the amount of coating alloy consumed. Simultaneously, the coating length is increased in areas with more intense and concentrated friction from grass blades and sand (the upper part of the tail fin and the tip near the blade tip, and the top of the inclined surface after the rounded corner at the tail fin bend), and decreased in areas with slightly less friction. This ensures that the expensive wear-resistant alloy is applied to the areas of most intense wear. In this way, waste of wear-resistant alloy is minimized, achieving better cost-effectiveness.

[0030] 3. The wear-resistant alloy coating on the upper surface of the blade has a fixed blade angle. Since the back of the blade is subject to wear, the blade angle can be kept consistent during use. At the same time, the wear-resistant alloy at the front of the wear layer protects the substrate behind it from wear, thus preventing the reduction of the overall strength of the blade and improving safety. Furthermore, customers will not have to replace the blade prematurely due to weakened blade strength, allowing the blade's overall service life to be fully achieved.

[0031] 4. The upper surface of the blade is coated with a wear-resistant alloy. The lower cutting surface of the blade will also rub against the grass after cutting, causing slight wear. When the wear causes the blade substrate to fall off, the wear-resistant alloy layer coated on the upper surface of the blade will lack support and slowly break off. After it breaks off, it can expose a cutting edge with the same thickness as the wear-resistant alloy coating (that is, the adjacent next strip of wear-resistant alloy begins to work), so that the lawnmower blade always maintains its sharpness and achieves a self-sharpening effect.

[0032] 5. Applying a wear-resistant coating with good wear resistance but poor impact resistance to the upper surface of the blade will keep it away from hard objects such as stones on the lawn below the blade body, reducing the likelihood of impact and further extending its service life.

[0033] 6. The alloy coating on the same part is usually composed of multiple coating layers. The bonding strength at the overlap between these layers is typically lower than that within the coating itself, leading to peeling at these points and reduced service life. To address this issue, this new design incorporates multiple coating layers (multi-level wear-resistant coatings) on the upper surface of the blade, the upper surface of the bend line, and the upper surface of the wing tail. At the overlap of adjacent wear-resistant coatings, the new coating layer is positioned in front of the old coating layer, first colliding with grass and sand particles. This covers the more vulnerable overlap, preventing direct wear and further enhancing the wear resistance of the coating, thus extending the tool's service life.

[0034] Through the aforementioned measures to improve blade life, and after actual simulated working condition tests, this new structure of self-sharpening and highly wear-resistant lawnmower blades can achieve the same cost as current self-sharpening blades, but significantly increases the lifespan of the blade body (according to the applicant's actual tests: the lifespan of this new type can be about three times that of current self-sharpening blades, equivalent to about six to nine times that of ordinary blades without wear-resistant alloy coatings), meeting customer needs.

Claims

1. A self-sharpening, wear-resistant blade for a lawn mower, characterized by: The blade body includes a mounting hole in the middle for connecting to a lawnmower. With the rotation direction of the blade body during operation as the positive direction, the positive ends of the blade body on both sides of the mounting hole are respectively provided with blades. The end of the blade body opposite to the blades is provided with an upward-curving wing tail. A bending line is formed between the wing tail and the blade body. The upper surface of the blades, the upper surface at the bending line, and the upper surface of the wing plate are all provided with multi-level wear-resistant coating strips.

2. The self-sharpening, wear-resistant blade for a lawnmower as described in claim 1, characterized in that: The wear-resistant coating strip is a wear-resistant alloy with a hardness higher than that of the blade substrate, applied to the blade surface by thermal spraying or laser coating processes.

3. The self-sharpening, wear-resistant blade for a lawnmower as described in claim 2, characterized in that: The multi-level wear-resistant coating strip includes multiple strip-shaped wear-resistant alloys parallel to the blade direction. The multiple strip-shaped wear-resistant alloys are arranged sequentially from the direction closest to the blade to the direction furthest from the blade, and the junctions of adjacent strip-shaped wear-resistant alloys overlap each other.

4. The self-sharpening, wear-resistant blade for a lawnmower as described in claim 3, characterized in that: In adjacent strip-shaped wear-resistant alloys, the strip-shaped wear-resistant alloy closer to the blade edge is the newly coated wear-resistant alloy, and the wear-resistant alloy farther from the blade edge is the old coated wear-resistant alloy. At the junction of adjacent strip-shaped wear-resistant alloys, the newly coated wear-resistant alloy presses down on the old coated wear-resistant alloy.

5. The self-sharpening, wear-resistant blade for a lawnmower as described in claim 4, characterized in that: On the upper surface of the blade, starting from the strip-shaped wear-resistant alloy near the blade edge, the length of the strip-shaped wear-resistant alloy decreases sequentially, and several strip-shaped wear-resistant alloys are aligned at one end near the blade body; on the upper surface of the bending line and the upper surface of the wing plate, starting from the strip-shaped wear-resistant alloy near the blade edge, the length of the strip-shaped wear-resistant alloy increases sequentially, and several strip-shaped wear-resistant alloys are aligned at one end near the blade body.

6. The self-sharpening, wear-resistant blade for a lawnmower as described in claim 5, characterized in that: Each strip of wear-resistant alloy on the upper surface of the blade has an arc-shaped cross-section, which is used to maintain the inclination angle of the upper surface of the blade.

Images