Double-layer blade structure of mowing machine tool bit

Abstract

The utility model discloses a double-layer blade structure of a mowing machine tool bit. The double-layer blade structure comprises a blade fixing seat, a motor output shaft inserted in the blade fixing seat, and a first blade, a second blade and a third blade which are arranged on the blade fixing seat, a mounting groove is formed in the blade fixing seat, a positioning part for positioning the second blade and the third blade is arranged in the mounting groove, the second blade and the third blade are arranged at the two ends of the mounting groove respectively and connected with the positioning part in a clamped mode, and the first blade is connected with an output shaft of the motor and arranged on the second blade and the third blade in a pressed mode.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn mowers, in particular to a double-layer blade structure of a lawn mower cutter head. Background Art

[0002] A lawn mower, also known as a weed cutter or lawn trimmer, is a common mechanical tool used to trim lawns, vegetation, etc. It can greatly save the operator's working time and reduce a large amount of human resources, so it is widely used.

[0003] Most existing products use a single blade, and due to the unreasonable structural design of the blade itself, the cutting efficiency or grass chopping efficiency of the blade is low.

[0004] A search of a Chinese new patent (publication number: CN215011685U) discloses a cutter assembly and a lawn mower. The cutter assembly provides a stepped blade positioning and mounting boss on the blade holder. When the first blade is assembled alone, the boss can support the first blade and the position of the first blade can remain unchanged.

[0005] However, the cutter assembly in this patent is still a superposition of two blades, and a special fastening assembly is required to limit the relative position between the two blades. Therefore, during the installation process, the installation of the double blades is relatively cumbersome. Utility Model Content

[0006] In order to solve the technical problems existing in the background technology, the utility model proposes a double-layer blade structure of a lawn mower cutter head.

[0007] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0008] A double-layer blade structure of a lawn mower cutter head includes a blade fixing seat, a motor output shaft inserted into the blade fixing seat, and a first blade, a second blade, and a third blade arranged on the blade fixing seat;

[0009] The blade fixing seat is provided with an installation groove, and a positioning portion for positioning the second blade and the third blade is provided in the installation groove. The second blade and the third blade are respectively arranged at both ends of the installation groove and are clamped with the positioning portion. The first blade is connected to the motor output shaft and is pressed onto the second blade and the third blade.

[0010] Preferably, the positioning portion includes a limiting post embedded in the blade fixing seat, and a limiting groove for the limiting post to be placed is formed on the second blade and the third blade, and the limiting groove includes an insertion area for the limiting post to be inserted, and a limiting area for limiting the second blade and the third blade. When the limiting post is placed in the limiting area, the limiting post abuts the second blade and the third blade to limit the second blade and the third blade from moving in the direction of leaving the installation groove. Through the above improvements, during the installation process, the second blade and the third blade are placed in the installation groove, the limiting post is first inserted into the insertion area of ​​the limiting groove, and then the second blade and the third blade are pulled outward, so that the limiting post slides into the limiting area to limit the second blade and the third blade from moving in the direction of leaving the installation groove, thereby realizing rapid installation and positioning of the second blade and the third blade.

[0011] Preferably, a first positioning protrusion is formed on the first blade, and a first positioning groove for the first positioning protrusion to be placed in is formed on the second blade and the third blade. Through the above improvement, the first positioning protrusion cooperates with the first positioning groove to further limit the position of the second blade and the third blade, restricting the relative position between the second blade and the third blade, thereby ensuring the reliability of the installation of the second blade and the third blade.

[0012] Preferably, the second blade and the third blade are formed with a second positioning protrusion, and the first blade is formed with a second positioning groove for the second positioning protrusion to be placed in. Through the above improvement, the second positioning protrusion cooperates with the second positioning groove, further improving the reliability of the installation of the second blade and the third blade.

[0013] Preferably, the positioning portion includes a sliding post embedded in the blade fixing seat and a limiting block formed on the blade fixing seat, a sliding groove for the limiting post to slide is formed on the second blade and the third blade, and a mounting opening for the limiting block to pass through is formed on the second blade and the third blade, the sliding groove has an installation position and a clamping position, and when the sliding post is in the installation position, the limiting block is arranged opposite to the mounting opening, and when the sliding post is in the clamping position, the limiting block passes through the mounting opening and abuts against the upper end surfaces of the second blade and the third blade to limit the second blade and the third blade from moving in the direction of leaving the installation groove. Through the above improvements, during the installation process, the limiting block is first passed through the mounting opening, and then the second blade and the third blade are slid, so that the sliding post moves from the installation position to the clamping position, so that the limiting block abuts against the upper end surfaces of the second blade and the third blade, thereby limiting the second blade and the third blade from moving in the direction of leaving the installation groove, thereby achieving rapid installation and positioning of the second blade and the third blade.

[0014] Preferably, a third positioning protrusion is formed on the second blade and the third blade, and a third positioning groove is formed on the first blade for the third positioning protrusion to be placed in. Through the above improvement, the third positioning protrusion cooperates with the third positioning groove, further improving the reliability of the installation of the second blade and the third blade.

[0015] Preferably, the first blade, the second blade, and the third blade have mounting sections and cutting sections, the mounting sections of the first blade, the second blade, and the third blade partially overlap in the projection direction, and the cutting sections of the second blade and the third blade are staggered relative to the cutting section of the first blade. Through the above improvement, staggered cutting is performed, so that the cut grass is more shredded.

[0016] Preferably, the cutting section of the first blade is arranged in an arc shape, and the cutting sections of the second blade and the third blade are arranged horizontally. Through the above improvements, the grass cutting effect is improved.

[0017] Preferably, the blade fixing seat is formed with a plurality of supporting ribs, which support the bottom of the first blade and conform to the bottom contour of the first blade. Through the above improvement, not only the stability of the installation of the first blade is improved, but also the stability of the first blade pressing the second blade and the third blade is improved.

[0018] Preferably, the blade fixing seat is provided with a guide post, and the first blade is formed with a guide hole for the guide post to be placed in. Through the above improvements, the stability of the installation of the first blade is improved.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] By arranging a mounting groove on the cutter disc fixing seat, and a positioning part in the mounting groove, the second blade and the third blade are positioned by using the positioning part, and the first blade is connected to the motor output shaft by a screw and pressed onto the second blade and the third blade. The second blade and the third blade do not need to be specially locked, but can be directly placed on the blade fixing seat, and the first blade is directly pressed onto the second and third blades, and locked by the screw in the first blade, thereby greatly improving the blade installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the overall structure of Example 1 of the present utility model from another angle;

[0023] Figure 3 An exploded view of the first embodiment of the present invention;

[0024] Figure 4 This is a structural schematic diagram of a blade fixing seat according to a first embodiment of the present invention;

[0025] Figure 5 This is a schematic structural diagram of the cooperation between the blade fixing seat and the second blade and the third blade in the first embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the overall structure of the second embodiment of the present utility model;

[0027] Figure 7 This is an exploded view of the second embodiment of the present invention;

[0028] Figure 8 This is a schematic structural diagram of the cooperation between the blade fixing seat and the second blade and the third blade according to the second embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the overall structure of the third embodiment of the present utility model;

[0030] Figure 10 This is an exploded view of the entire third embodiment of the present invention;

[0031] Figure 11 This is a schematic structural diagram of the cooperation between the blade fixing seat and the second blade and the third blade in the third embodiment of the present invention;

[0032] In the figure: 1. Blade fixing seat; 2. Motor output shaft; 3. First blade; 4. Second blade; 5. Third blade; 6. Mounting slot; 7. Positioning portion; 1.1. Limiting post; 1.2. Limiting slot; 1.3. Insertion area; 1.4. Restricted area; 2.1. First positioning protrusion; 2.2. First positioning groove; 3.1. Second positioning protrusion; 3.2. Second positioning groove; 4.1. Sliding post; 4.2. Limiting block; 4.3. Sliding slot; 4.4. Mounting opening; 5.1. Third positioning protrusion; 5.2. Third positioning groove; 6.1. Mounting section; 6.2. Cutting section; 6.3. Support rib; 6.4. Guide post; 6.5. Guide hole; DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] It should be understood that although terms such as upper, middle, lower, top, end, etc. appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for ease of understanding, and are not used to define any direction or order limitation.

[0035] Example 1

[0036] like Figure 1-5 As shown, a double-layer blade structure of a lawn mower cutter head includes a blade fixing seat 1, a motor output shaft 2 inserted into the blade fixing seat 1, and a first blade 3, a second blade 4 and a third blade 5 arranged on the blade fixing seat 1;

[0037] Specifically, an installation groove 6 is provided on the blade fixing seat 1, and a positioning portion 7 for positioning the second blade 4 and the third blade 5 is provided in the installation groove 6. The second blade 4 and the third blade 5 are respectively arranged at both ends of the installation groove 6 and are clamped with the positioning portion 7. The first blade 3 is connected to the motor output shaft 2 and is pressed onto the second blade 4 and the third blade 5.

[0038] During the entire blade installation process, the second blade 4 and the third blade 5 are first positioned using the positioning portion 7. The first blade 3 is connected to the motor output shaft 2 by screws and pressed onto the second blade 4 and the third blade 5 to achieve the installation and fixation of the first blade 3, the second blade 4, and the third blade 5. During the entire installation process, there is no need to specially lock the second blade 4 and the third blade 5. They can be placed directly on the blade fixing seat 1, and the first blade 3 is used to press directly on the second and third blades 5. They are locked by the screws in the first blade 3, which greatly improves the blade installation efficiency.

[0039] As a further explanation of the cooperation between the second blade 4 and the third blade 5 and the positioning portion 7, the positioning portion 7 includes a limiting column 1.1 embedded in the blade fixing seat 1, and a limiting groove 1.2 for inserting the limiting column 1.1 is formed on the second blade 4 and the third blade 5, and the limiting groove 1.2 includes an insertion area 1.3 for inserting the limiting column 1.1, and a limiting area 1.4 for limiting the second blade 4 and the third blade 5. When the limiting column 1.1 is placed in the limiting area 1.4, the limiting column 1.1 abuts the second blade 4 and the third blade 5 to limit the second blade 4 and the third blade 5 from moving in the direction of leaving the mounting groove 6.

[0040] During the installation process, the second blade 4 and the third blade 5 are placed into the installation groove 6, so that the limiting post 1.1 is first inserted into the insertion area 1.3 of the limiting groove 1.2, and then the second blade 4 and the third blade 5 are pulled outward to allow the limiting post 1.1 to slide into the restriction area 1.4. The limiting post 1.1 will abut against the upper end surfaces of the second blade 4 and the third blade 5 to limit the second blade 4 and the third blade 5 from moving in the direction of leaving the installation groove 6, thereby realizing rapid installation and positioning of the second blade 4 and the third blade 5, and cooperating with the installation groove 6 to limit the second blade 4 and the third blade 5, ensuring the reliability of the installation of the second blade 4 and the third blade 5.

[0041] As a further explanation of the cooperation between the first blade 3 and the second blade 4 and the third blade 5, a first positioning protrusion 2.1 is formed on the first blade 3, and a first positioning groove 2.2 for the first positioning protrusion 2.1 to be placed is formed on the second blade 4 and the third blade 5.

[0042] When the first blade 3 is installed, the first positioning protrusion 2.1 on the first blade 3 will be inserted into the first positioning groove 2.2 on the second blade 4 and the third blade 5. The first positioning protrusion 2.1 cooperates with the first positioning groove 2.2 to further limit the second blade 4 and the third blade 5, limiting the relative position between the second blade 4 and the third blade 5, and ensuring the reliability of the installation of the second blade 4 and the third blade 5.

[0043] As a further explanation of the cutting of the first blade 3, the second blade 4 and the third blade 5, the first blade 3, the second blade 4 and the third blade 5 have a mounting section 6.1 and a cutting section 6.2, the mounting sections 6.1 of the first blade 3, the second blade 4 and the third blade 5 partially overlap in the projection direction, and the cutting sections 6.2 of the second blade 4 and the third blade 5 are staggered relative to the cutting section 6.2 of the first blade 3.

[0044] In addition, the cutting section 6.2 of the first blade 3 is arranged in an arc shape, and the cutting sections 6.2 of the second blade 4 and the third blade 5 are arranged horizontally, so as to perform staggered cutting, so that the cut grass is more crushed, and the grass cutting effect is greatly improved.

[0045] Preferably, the height of the first blade 3, the second blade 4 and the third blade 5 is 10-30 mm. If the height is set too low, the crushing ratio will be too low when cutting high grass. If it is set too high, it will affect the height of the main vortex.

[0046] Preferably, a plurality of supporting ribs 6.3 are formed on the blade fixing seat 1. The supporting ribs 6.3 are supported on the bottom of the first blade 3 and fit the bottom contour of the first blade 3, which not only improves the stability of the installation of the first blade 3, but also improves the stability of the first blade 3 pressing the second blade 4 and the third blade 5.

[0047] In addition, a guide column 6.4 is provided on the blade fixing seat 1, and a guide hole 6.5 for inserting the guide column 6.4 is formed on the first blade 3. The guide column 6.4 cooperates with the guide hole 6.5 to improve the installation stability of the first blade 3.

[0048] Example 2

[0049] like Figure 6-8 As shown, this embodiment differs from the first embodiment in that a second positioning protrusion 3.1 is formed on the second blade 4 and the third blade 5, and a second positioning groove 3.2 is formed on the first blade 3 for the second positioning protrusion 3.1 to be placed therein.

[0050] When the first blade 3 is installed, the second positioning protrusion 3.1 on the second blade 4 and the third blade 5 will be inserted into the second positioning groove 3.2 on the first blade 3. The second positioning protrusion 3.1 is used to cooperate with the second positioning groove 3.2 to further limit the second blade 4 and the third blade 5, thereby limiting the relative position between the second blade 4 and the third blade 5, and ensuring the reliability of the installation of the second blade 4 and the third blade 5.

[0051] Example 3

[0052] like Figure 9-11 As shown, the difference between this embodiment and the first embodiment is that the positioning portion 7 includes a sliding column 4.1 embedded in the blade fixing seat 1, and a limit block 4.2 formed on the blade fixing seat 1, a sliding groove 4.3 for the sliding column 4.1 to slide is formed on the second blade 4 and the third blade 5, and a mounting opening 4.4 for the limit block 4.2 to pass through is formed on the second blade 4 and the third blade 5, the sliding groove 4.3 has an installation position and a clamping position, and when the sliding column 4.1 is in the installation position, the limit block 4.2 is arranged opposite to the mounting opening 4.4, and when the sliding column 4.1 is in the clamping position, the limit block 4.2 passes through the mounting opening 4.4 and abuts against the upper end surfaces of the second blade 4 and the third blade 5 to limit the second blade 4 and the third blade 5 from moving in the direction of leaving the mounting groove 6.

[0053] During the installation process, first align the limit block 4.2 with the installation opening 4.4, pass the limit block 4.2 through the installation opening 4.4, and then slide the second blade 4 and the third blade 5 to move the sliding column 4.1 from the installation position to the clamping position, so that the limit block 4.2 abuts the upper end surface of the second blade 4 and the third blade 5, thereby limiting the movement of the second blade 4 and the third blade 5 toward the direction of disengaging from the installation groove 6, thereby realizing rapid installation and positioning of the second blade 4 and the third blade 5.

[0054] In addition, a third positioning protrusion 5.1 is formed on the second blade 4 and the third blade 5, and a third positioning groove 5.2 is formed on the first blade 3 for the third positioning protrusion 5.1 to be placed therein. The third positioning protrusion 5.1 cooperates with the third positioning groove 5.2 to further improve the installation reliability of the second blade 4 and the third blade 5.

[0055] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A double-layer blade structure for a lawn mower head, characterized in that: It comprises a blade fixing seat (1), a motor output shaft (2) inserted into the blade fixing seat (1), and a first blade (3), a second blade (4), and a third blade (5) arranged on the blade fixing seat (1); The blade fixing seat (1) is provided with a mounting groove (6), and a positioning portion (7) for positioning the second blade (4) and the third blade (5) is provided in the mounting groove (6). The second blade (4) and the third blade (5) are respectively arranged at two ends of the mounting groove (6) and are engaged with the positioning portion (7). The first blade (3) is connected to the motor output shaft (2) and is pressed onto the second blade (4) and the third blade (5).

2. The double-layer blade structure of a lawn mower cutter head according to claim 1, characterized in that: The positioning portion (7) comprises a limiting column (1.1) embedded in the blade fixing seat (1); a limiting groove (1.2) for the limiting column (1.1) to be inserted is formed on the second blade (4) and the third blade (5); the limiting groove (1.2) comprises an insertion area (1.3) for the limiting column (1.1) to be inserted, and a limiting area (1.4) for limiting the second blade (4) and the third blade (5); when the limiting column (1.1) is inserted into the limiting area (1.4), the limiting column (1.1) abuts against the second blade (4) and the third blade (5) to limit the second blade (4) and the third blade (5) from moving in a direction away from the mounting groove (6).

3. The double-layer blade structure of a lawn mower cutter head according to claim 2, characterized in that: A first positioning protrusion (2.1) is formed on the first blade (3), and a first positioning groove (2.2) for the first positioning protrusion (2.1) to be placed is formed on the second blade (4) and the third blade (5).

4. The double-layer blade structure of a lawn mower cutter head according to claim 2, characterized in that: A second positioning protrusion (3.1) is formed on the second blade (4) and the third blade (5), and a second positioning groove (3.2) for the second positioning protrusion (3.1) to be placed is formed on the first blade (3).

5. The double-layer blade structure of a lawn mower cutter head according to claim 1, characterized in that: The positioning portion (7) comprises a sliding column (4.1) embedded in the blade fixing seat (1) and a limiting block (4.2) formed on the blade fixing seat (1); a sliding groove (4.3) for the sliding column (4.1) to slide is formed on the second blade (4) and the third blade (5); and a mounting opening (4.4) for the limiting block (4.2) to pass through is formed on the second blade (4) and the third blade (5); the sliding groove (4.3) has an installation position and a clamping position, and when the sliding column (4.1) is in the installation position, the limiting block (4.2) is arranged opposite to the mounting opening (4.4); when the sliding column (4.1) is in the clamping position, the limiting block (4.2) passes through the mounting opening (4.4) and abuts against the upper end surfaces of the second blade (4) and the third blade (5) to limit the second blade (4) and the third blade (5) from moving in a direction away from the mounting groove (6).

6. The double-layer blade structure of a lawn mower cutter head according to claim 5, characterized in that: A third positioning protrusion (5.1) is formed on the second blade (4) and the third blade (5), and a third positioning groove (5.2) for the third positioning protrusion (5.1) to be placed is formed on the first blade (3).

7. The double-layer blade structure of a lawn mower cutter head according to claim 1, characterized in that: The first blade (3), the second blade (4) and the third blade (5) have a mounting section (6.1) and a cutting section (6.2); the mounting sections (6.1) of the first blade (3), the second blade (4) and the third blade (5) partially overlap in a projection direction, and the cutting sections (6.2) of the second blade (4) and the third blade (5) are staggered relative to the cutting section (6.2) of the first blade (3).

8. The double-layer blade structure of a lawn mower cutter head according to claim 1, characterized in that: The cutting section (6.2) of the first blade (3) is arranged in an arc shape, and the cutting sections (6.2) of the second blade (4) and the third blade (5) are arranged horizontally.

9. The double-layer blade structure of a lawn mower cutter head according to claim 1, characterized in that: A plurality of supporting ribs (6.3) are formed on the blade fixing seat (1); the supporting ribs (6.3) are supported on the bottom of the first blade (3) and fit the bottom contour of the first blade (3).

10. The double-layer blade structure of a lawn mower cutter head according to claim 1, characterized in that: A guide column (6.4) is provided on the blade fixing seat (1), and a guide hole (6.5) for the guide column (6.4) to be placed is formed on the first blade (3).

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