Cutting knife mechanism of rotary weeding machine

Abstract

The invention discloses a cutting knife mechanism of a rotary weeding machine, and relates to the technical field of plant protection equipment, the cutting knife mechanism comprises a cutter head and a plurality of cutting knives, the plurality of cutting knives are uniformly mounted on the cutter head, the cutting knives are of a symmetrical structure, the longitudinal symmetrical line of the cutting knives is the central axis of the cutting knives, and the central axis of the cutting knives passes through the circle center of a circle where the cutter head is located. Energy consumption can be reduced, the grass winding rate can be reduced, and the weeding efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of plant protection equipment, and in particular to a cutting knife mechanism of a rotary weeder. Background Art

[0002] Weeds can be considered a serious plant pest, which can reduce the potential yield of crops by 34%. In order to reduce environmental pollution and ensure food safety, it is necessary to use a mower to remove weeds; currently, there are few mower designs that address energy consumption and weed entanglement issues. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a cutting knife mechanism of a rotary weeder, which can reduce energy consumption and grass entanglement rate and improve weeding efficiency.

[0004] The present invention achieves the above technical objectives through the following technical means.

[0005] A knife cutting mechanism of a rotary weeder comprises a knife disc and a knife. A plurality of the knife cutting knives are evenly mounted on the knife disc. The knife cutting knives are symmetrical structures. The longitudinal symmetry line of the knife cutting knives is the knife central axis. The knife central axis passes through the center of the circle where the knife disc is located.

[0006] In the above scheme, the end of the cutting knife extending out of the cutting disc is the outer end of the cutting knife, and the width of the blade where the outer end of the cutting knife is located is greater than the width of the blade where the tail of the blade is located; the outer end of the cutting knife and the tail of the blade are connected by a cutting knife blade curve.

[0007] In the above scheme, the angle formed by the tangent of the cutting knife blade curve and the central axis of the cutting knife gradually increases from the outer end of the cutting knife to the tail of the cutting knife blade.

[0008] In the above scheme, the cutting knife edge curve conforms to r=260cosθ-533.4sinθ, wherein r is the polar diameter and θ is the polar angle.

[0009] In the above scheme, the cutting knife is provided with cutting blade angles on both sides, and the angle range of the cutting blade angles is 20° to 30°.

[0010] In the above solution, a mounting hole is provided on the cutting knife, and the mounting hole cooperates with a mounting pin provided on the cutter disc.

[0011] In the above solution, the thickness of the cutting knife is 4 mm to 10 mm.

[0012] In the above scheme, when working, the cutter disc is at a certain angle to the ground.

[0013] In the above solution, the angle between the cutter disc and the ground is less than 15°.

[0014] In the above solution, the cutting knife installed on the cutter disc faces the ground.

[0015] Beneficial effects:

[0016] 1. In order to reduce the grass entanglement rate, it is necessary to ensure that the cutting force at the outer end of the cutter is the same as the cutting force at the tail of the cutter blade, that is, the cutting force at the position where the blade cutting speed is high is the same as the cutting force at the position where the cutting speed is low. Since the larger the sliding cutting angle within a certain range, the better the sliding cutting effect and the smaller the cutting resistance; therefore, the present invention makes the angle between the tangent of the cutter blade curve and the central axis of the cutter gradually increase from the outer end to the tail of the blade.

[0017] 2. In order to reduce the cutting force, the blade curve for cutting weeds needs to be an outward convex arc, so the present invention requires that the width of the blade at the outer end of the cutting knife is greater than the width of the blade at the tail of the cutting knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cutting knife mechanism of the rotary weeder;

[0019] Figure 2 for Figure 1 Schematic diagram of the cutting knife structure involved in;

[0020] Figure 3 It is a schematic diagram of the cutting knife blade curve;

[0021] Figure 4 Schematic diagram of the cutter disc structure;

[0022] Figure 5 Schematic diagram of the relative position of the cutter disc and the ground.

[0023] Reference numerals:

[0024] 1-cutter disc; 2-cutting knife; 3-mounting hole; 4-end of the cutting blade; 5-outer end of the cutting knife; 6-center axis of the cutting knife; 7-cutting knife blade angle; 8-cutting knife blade curve; 9-mounting pin; 10-ground; 11-angle between the cutter disc and the ground. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] A knife cutting mechanism of a rotary weeder comprises a knife disc 1 and a knife 2. The base of the knife 2 is provided with a mounting hole 3, and the knife disc 1 is provided with a plurality of mounting pins 9. The knife 2 is fixed to the knife disc 1 through the mounting holes 3 and the mounting pins 9.

[0029] The cutter disc 1 is a right circular cylinder or can be equivalent to a right circular cylinder, and the cutter disc 1 can rotate around the central axis of the right circular cylinder; the cutter disc 1 can be placed at a certain angle to the ground 10, and the angle 11 between the cutter disc 1 and the ground is not greater than 15°, and one end of the cutter disc 1 on which the cutting knife 2 is installed faces the ground 10; the mounting pins 9 are arranged at equal intervals on the same surface of the cutter disc 2.

[0030] The thickness of the cutting knife 2 is not less than 4 mm and not more than 10 mm; the width of the blade at the outer end 5 of the cutting knife is greater than the width of the blade at the tail 4 of the blade, and the angle between the tangent of the cutting knife blade curve 8 and the central axis 6 of the cutting knife gradually increases from the outer end 5 of the cutting knife to the tail 4 of the blade; the equation of the cutting knife blade curve 8 is r=260cosθ-533.4sinθ, where r is the polar diameter and θ is the polar angle; the cutting knife blade angle 7 is not less than 20° and not more than 30°. When the cutting knife 2 is installed on the cutting disc 2, the central axis 6 of the cutting knife passes through the center of the bottom surface of the cutting disc 2, that is, the instantaneous speed direction of the cutting knife during cutting operation is perpendicular to the central axis 6 of the cutting knife.

[0031] Combined with Figure 1 As shown, a low-consumption and grass-entanglement-proof cutting knife mechanism comprises a cutter disc 1 and a cutting knife 2. The cutting knife 2 is provided with a mounting hole 3, and the cutter disc 1 is provided with a mounting pin 9. The cutting knife 2 is mounted on the cutter disc 1 through the mounting hole 3 and the mounting pin 9, and one end of the cutting blade of the cutter disc 1 faces the ground; the cutter disc 1 rotates around the central axis of the cutter disc, and at the same time drives the cutting knife 2 to rotate to cut the weeds on the ground; the mounting pin 9 and the mounting hole 3 ensure that the central axis 6 of the cutting knife 2 passes through the center of the bottom surface of the cutter disc 2 during the cutting operation, that is, the instantaneous speed direction of the cutting knife during the cutting operation is perpendicular to the central axis 6 of the cutting knife.

[0032] Figure 2 It is a schematic diagram of the structure of the cutter 2 in the cutter mechanism of the present invention. The angle between the tangent of the cutter blade curve 8 and the central axis 6 of the cutter gradually increases from the outer end 5 of the cutter to the tail 4 of the blade, which can ensure that the sliding cutting angle gradually increases from the outer end 5 of the cutter to the tail position 4. The sliding cutting effect offsets the reduction of the cutting speed, resulting in the cutting resistance on the blade being roughly the same, reducing the grass entanglement rate; at the same time, the blade width of the outer end 5 of the cutter is greater than the blade width of the tail 4 of the blade, so that the cutter blade curve 8 is convex, ensuring that when cutting weeds, the cutting resistance of the blade is smaller; the blade angle 8 is not less than 20° and not more than 30°, further ensuring the reduction of cutting resistance and also ensuring the durability of the cutter. In order to ensure the passability and safety during cutting, the thickness of the cutter is not less than 4 mm and not more than 10 mm.

[0033] Figure 3 It is a diagram of the cutting blade of the present invention. The cutting blade curve 8 adopts the equation r=260cosθ-533.4sinθ, where r is the polar diameter, θ is the polar angle, and point O in the figure is the origin of the polar coordinate system.

[0034] Figure 4 It is a schematic diagram of the structure of the cutter disc 1 in the cutter mechanism of the present invention, the cutter disc 1 is provided with a mounting pin 9; the cutter disc 1 is a right circular cylinder or can be equivalent to a right circular cylinder, and the cutter disc 1 can rotate around the central axis of the right circular cylinder; the cutter disc 1 is mounted with one end of the cutter 2 facing the ground.

[0035] Figure 5 The schematic diagram of the relative position of the blade disc 1 and the ground 10 in the cutting knife mechanism of the present invention is that the angle 11 between the blade disc and the ground is not greater than 15°; the blade can be tilted at a certain angle to reduce the cutting resistance, while too large a tilt may affect the weeding operation.

[0036] The specific design of the cutter blade curve 8 can be changed according to the type and proportion of the weeds to be removed and the mechanical properties under high-speed cutting.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0038] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A cutting mechanism of a rotary weeder, characterized in that: The invention comprises a cutter disc (1) and a cutting knife (2), wherein a plurality of the cutting knives (2) are evenly mounted on the cutter disc (1), the cutting knives (2) are of a symmetrical structure, the longitudinal symmetry line of the cutting knife (2) is the central axis (6) of the cutting knife, and the central axis (6) of the cutting knife passes through the center of the circle where the cutter disc (2) is located.

2. The cutting blade mechanism of the rotary weeder according to claim 1, characterized in that: The end of the cutting knife (2) extending out of the cutting disc (1) is the cutting knife outer end (5), and the width of the blade where the cutting knife outer end (5) is located is greater than the width of the blade where the blade tail (4) is located; the cutting knife outer end (5) and the blade tail (4) are connected via a cutting knife blade curve (8).

3. The cutting blade mechanism of the rotary weeder according to claim 2, characterized in that: The angle formed between the tangent of the cutting blade curve (8) and the central axis (6) of the cutting blade gradually increases from the outer end (5) of the cutting blade to the tail (4) of the cutting blade.

4. The cutting blade mechanism of a rotary weeder according to any one of claims 2 to 3, characterized in that: The cutting knife edge curve (8) conforms to r=260cosθ-522.4sinθ, wherein r is the polar diameter and θ is the polar angle.

5. The cutting blade mechanism of the rotary weeder according to claim 1, characterized in that: The cutting knife (2) is provided with cutting knife blade angles (8) on both sides, and the angle range of the cutting knife blade angles (8) is 20° to 30°.

6. The cutting blade mechanism of the rotary weeder according to claim 1, characterized in that: The cutting knife (2) is provided with a mounting hole (3), and the mounting hole (3) cooperates with a mounting pin (9) provided on the cutting disc (1).

7. The cutting blade mechanism of the rotary weeder according to claim 1, characterized in that: The thickness of the cutting knife (2) is 4 mm to 10 mm.

8. The cutting blade mechanism of the rotary weeder according to claim 1, characterized in that: When working, the cutter disc (1) and the ground (10) are at a certain angle.

9. The cutting blade mechanism of the rotary weeder according to claim 8, characterized in that: The angle between the cutter disc (1) and the ground (10) is less than 15°.

10. The cutting blade mechanism of the rotary weeder according to claim 8, characterized in that: The cutting knife (2) installed on the cutting disc (1) faces the ground (10).

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