A grass chopper's knife shaft anti-winding structure

Abstract

The utility model discloses a kind of knife shaft anti-winding structures of grass chopper, belong to agricultural machinery field, including frame, knife shaft and two bearing seats, two bearing seats are respectively fixed on the opposite two sides outer walls of frame, knife shaft two ends pass through frame side wall and are rotatably connected with two bearing seats by bearing, two anti-winding covers are sleeved on the outer peripheral wall of knife shaft, two anti-winding covers are respectively fixedly connected with the opposite two sides inner walls of frame and open on opposite side, two anti-winding plates are fixed on the outer wall of knife shaft, two anti-winding plates are respectively rotatably located in two anti-winding covers, and anti-winding plate side wall and anti-winding cover inner wall gap fit.The beneficial effects of the present application are as follows: the anti-winding cover covers the two ends of the knife shaft, preventing the uncut weeds from winding around the knife shaft, and also preventing the grass clippings from entering the bearing seat from the joint of the knife shaft and the anti-winding cover; the anti-winding plate is fixed on the outer peripheral wall of the knife shaft, preventing foreign matter from entering the anti-winding cover from the axial direction of the knife shaft, fully protecting the bearing seat and the bearing, and prolonging the service life.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery, specifically to an anti-winding structure for the blade shaft of a grass shredder. Background Technology

[0002] A grass shredder is a mechanical device used for cutting various weeds during cultivation. It mainly consists of a power unit, a cutter shaft, blades, a movable baffle, and a frame. The cutter shaft is rotatably mounted inside the frame. The high-speed rotation of the cutter shaft drives the blades to shred the grass. During the cutting process, uncut weeds may become entangled on the cutter shaft, increasing rotational resistance and the machine's load. In severe cases, this may damage the power unit. Furthermore, shredded grass may enter the bearing housing through the mating area between the cutter shaft and the bearing housing, causing friction and heat in the bearing and reducing its service life. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is: how to prevent the cutter shaft from being entangled by weeds and to protect the bearing.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a blade shaft anti-winding structure for a grass shredder, comprising a frame, a blade shaft, and two bearing seats. The two bearing seats are respectively fixedly mounted on the outer walls of opposite sides of the frame. The two ends of the blade shaft pass through the side walls of the frame and are rotatably connected to the two bearing seats through bearings. Two anti-winding covers are sleeved on the outer peripheral wall of the blade shaft. The two anti-winding covers are respectively fixedly connected to the inner walls of opposite sides of the frame, with one side open. Two anti-winding plates are fixedly mounted on the outer wall of the blade shaft. The two anti-winding plates are rotatably located inside the two anti-winding covers, and the side walls of the anti-winding plates are clearance-fitted with the inner walls of the anti-winding covers.

[0005] The beneficial effects of this solution are as follows: the anti-tangling cover covers both ends of the cutter shaft to prevent uncut weeds from getting tangled on the cutter shaft, and also prevents grass clippings from entering the bearing housing from the joint between the cutter shaft and the anti-tangling cover; the anti-tangling plate is fixed on the outer peripheral wall of the cutter shaft to prevent foreign objects from entering the anti-tangling cover from the axial direction of the cutter shaft, thus fully protecting the bearing and extending its service life.

[0006] Preferably, the gap between the side wall of the anti-tangle plate and the inner wall of the anti-tangle cover is 2 to 3.5 mm.

[0007] The advantages of adopting the above preferred solution are: increasing the installation gap, reducing the assembly difficulty, and preventing friction when rotating relative to each other, resulting in a longer service life.

[0008] Preferably, the outer diameter of the anti-tangling plate is larger than the outer diameter of the bearing seat.

[0009] The advantages of adopting the above preferred solution are: the outer diameter of the anti-winding plate is increased, which can better prevent foreign objects from entering the bearing housing along the outer peripheral wall of the cutter shaft and damaging the bearing.

[0010] Preferably, the cutter shaft includes a hollow cylinder, with end caps fixed at both ends of the hollow cylinder, and the end caps are rotatably connected to two bearing seats.

[0011] The advantages of adopting the above preferred solution are: the hollow structure reduces cost and tool shaft weight, and can better drive its rotation.

[0012] Preferably, the anti-tangling plate and the cutter shaft are welded together.

[0013] The advantages of adopting the above-mentioned preferred scheme are: simple processing, high production efficiency, and good fixation effect. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the anti-winding structure of the cutter shaft of this utility model; Appendix Figure 2 for Figure 1 Enlarged view of point A.

[0015] Explanation of reference numerals in the attached diagram: 1. Cutter shaft; 2. Bearing housing; 3. Anti-winding cover; 4. Anti-winding plate; 5. Frame; 6. Blade; 7. Dust cover; 101. Hollow cylinder; 102. End. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0017] Example 1 like Figures 1 to 2As shown, an anti-tangling structure for the blade shaft of a grass shredder includes a frame 5, a blade shaft 1, and two bearing seats 2. The two bearing seats 2 are respectively fixed on the opposite outer walls of the frame 5. The two ends of the blade shaft 1 pass through the side walls of the frame 5 and are rotatably connected to the two bearing seats 2 through bearings. Two anti-tangling covers 3 are sleeved on the outer peripheral wall of the blade shaft 1. The two anti-tangling covers 3 are respectively fixedly connected to the opposite inner walls of the frame 5, with one side open. Two anti-tangling plates 4 are fixedly installed on the outer wall of the blade shaft 1. The two anti-tangling plates 4 are rotatably located inside the two anti-tangling covers 3, and the side walls of the anti-tangling plates 4 are clearance-fitted with the inner walls of the anti-tangling covers 3.

[0018] In this embodiment, the bottom surface of the frame 5 of the grass shredder is open, the blade shaft 1 is horizontally installed on the inner walls of opposite sides of the frame 5, a number of blades 6 are fixed on the outer peripheral wall of the blade shaft 1, one end of the blade shaft 1 passes through the side wall of the frame 5 and the bearing seat 2 and extends to the outside and is fixedly provided with a pulley, the power unit is fixedly provided on the outside of the frame 5, and the pulley is poweredly connected to the power unit through belt drive; wheels are provided on the outer walls of opposite sides of the frame 5, and a movable baffle is hinged to the front side of the frame 5.

[0019] When grass shredding is required, the worker pushes the frame 5 to move. After the movable baffle on the front side of the frame 5 comes into contact with the weeds, the weeds are pushed down and lie flat on the ground. At the same time, the movable baffle is pushed open, and the weeds enter the interior of the frame 5. The power unit drives the cutter shaft 1 to rotate at high speed, and the cutter shaft 1 drives the blades 6 to shred the weeds.

[0020] During the above process, the weeds located in the middle of the cutter shaft 1 are chopped by the blade 6, while the weeds near the two ends of the cutter shaft 1 are prone to getting tangled on the cutter shaft 1, which increases the rotational resistance and increases the machine load. This solution adds anti-tangling covers 3 to both ends of the cutter shaft 1 to protect both ends of the cutter shaft 1, prevent weeds from getting tangled on the cutter shaft 1, and also prevent grass clippings from entering the joint between the cutter shaft 1 and the bearing seat 2 in the radial direction of the cutter shaft 1.

[0021] Then, to prevent grass clippings from entering the anti-tangling cover 3 from the axial direction of the cutter shaft 1, that is, from the gap between the outer peripheral wall of the cutter shaft 1 and the anti-tangling cover 3, an anti-tangling plate 4 is added to block grass clippings from the outer peripheral wall of the cutter shaft 1. The anti-tangling plate 4 is coaxial with the cutter shaft 1, and the outer diameter of the anti-tangling plate 4 is larger than that of the cutter shaft 1. Therefore, when the cutter shaft 1 rotates, the linear velocity of the edge of the anti-tangling plate 4 is greater than that of the outer peripheral wall of the cutter shaft 1, making it more difficult for grass clippings to enter the gap between the anti-tangling plate 4 and the anti-tangling cover 3, resulting in a better blocking effect.

[0022] Based on this embodiment, a dust cover 7 can also be fixedly provided on the side of the bearing housing 2 away from the cutter shaft 1 to reduce dust from entering the bearing housing 2 from the outside.

[0023] like Figure 2 As shown, the gap between the side wall of the anti-tangling plate 4 and the inner wall of the anti-tangling cover 3 is 2 to 3.5 mm.

[0024] In this embodiment, the installation gap between the outer diameter of the anti-tangling plate 4 and the inner diameter of the anti-tangling cover 3 is increased, which significantly reduces the assembly difficulty and prevents friction when they rotate relative to each other, resulting in a longer service life. The millimeter-level gap still ensures that grass clippings cannot pass through.

[0025] like Figure 2 As shown, the outer diameter of the anti-tangling plate 4 is larger than the outer diameter of the bearing seat 2.

[0026] In this embodiment, the outer diameter of the anti-tangling plate 4 is increased, which can completely block the holes on the side wall of the frame 5 and the bearing seat 2, and better prevent foreign objects from entering the bearing seat 2; and the anti-tangling plate 4 rotates inside the anti-tangling cover 3. Therefore, as the anti-tangling plate 4 increases, the anti-tangling cover 3 also increases synchronously. The larger the anti-tangling cover 3 is, the lower the probability that weeds will get tangled on the outer peripheral wall of the anti-tangling cover 3.

[0027] like Figure 1 As shown, the cutter shaft 1 includes a hollow cylinder 101, and end heads 102 are fixedly provided at both ends of the hollow cylinder 101. The end heads 102 are rotatably connected to two bearing seats 2.

[0028] In this embodiment, the hollow structure reduces cost and weight of the cutter shaft 1, and enables better rotation.

[0029] like Figure 2 As shown, the anti-tangling plate 4 and the cutter shaft 1 are welded together.

[0030] In this embodiment, the processing is simple, the production efficiency is high, and the fixation effect is good.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A blade shaft anti-winding structure for a grass shredder, comprising a frame (5), a blade shaft (1), and two bearing seats (2), characterized in that, Two bearing seats (2) are fixedly mounted on the opposite outer walls of the frame (5). The two ends of the cutter shaft (1) pass through the side walls of the frame (5) and are rotatably connected to the two bearing seats (2) through bearings. Two anti-tangle covers (3) are sleeved on the outer peripheral wall of the cutter shaft (1). The two anti-tangle covers (3) are fixedly connected to the opposite inner walls of the frame (5) and the opposite side is open. Two anti-tangle plates (4) are fixedly mounted on the outer wall of the cutter shaft (1). The two anti-tangle plates (4) are rotatably located inside the two anti-tangle covers (3). The side wall of the anti-tangle plate (4) is clearance-fitted with the inner wall of the anti-tangle cover (3).

2. The anti-winding structure for the blade shaft of a grass shredder according to claim 1, characterized in that, The gap between the side wall of the anti-tangle plate (4) and the inner wall of the anti-tangle cover (3) is 2 to 3.5 mm.

3. The anti-winding structure for the blade shaft of a grass shredder according to claim 1, characterized in that, The outer diameter of the anti-tangling plate (4) is larger than the outer diameter of the bearing seat (2).

4. The anti-winding structure for the blade shaft of a grass shredder according to claim 1, characterized in that, The cutter shaft (1) includes a hollow cylinder (101), and the hollow cylinder (101) is fixedly provided with end heads (102) at both ends. The end heads (102) are rotatably connected to two bearing seats (2).

5. The anti-winding structure for the blade shaft of a grass shredder according to any one of claims 1 to 4, characterized in that, The anti-tangling plate (4) and the cutter shaft (1) are welded together.

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