blade guard

Abstract

The utility model discloses a kind of blade guards, it is related to the technical field of agricultural cutting machinery, the left and right sides of the front end of blade guard main body are provided with upper blade guard wall and lower blade guard wall, the clamping cavity formed by the upper blade guard wall and lower blade guard wall arranged in upper and lower interval is the tool path of the cutting tool arranged, the left and right sides of upper blade guard wall or lower blade guard wall are provided with recess, and the surface of recess is arc profile;The blade guard provided in the application, simple structure and reliable constraint effect can be provided to straw, weed branch, and cutting efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of agricultural cutting machinery technology, specifically a knife protector. Background Technology

[0002] During the operation of a lawnmower or harvester, its core cutting component (moving blade) achieves the shearing effect on herbaceous plants (such as weeds and crops) through high-speed reciprocating motion. In order to protect the blade and assist the blade in cutting, a blade guard is provided.

[0003] The document entitled "A Blade Guard (Document No. CN222053948U, hereinafter referred to as Document 1)" discloses a technical solution that uses grooves on both sides of the upper and lower blade guards to hold weeds, so that the weeds are in an upright state, which makes it easier for the cutter to cut them better.

[0004] A technical solution is also disclosed in a document entitled "Anti-slip Blade Protector (Document No. CN221203348U, hereinafter referred to as Document 2)". It is provided by arranging anti-slip teeth on both sides of the shearing beam, and the surface of the anti-slip teeth intersects with the surface of the cutting edge of the shearing beam. The anti-slip teeth are used to hold the crop so that the cutter can cut it.

[0005] To facilitate the cutting of weeds by the cutter, Reference 1 uses a serrated structure formed between adjacent protrusions to clamp the weeds, while Reference 2 uses anti-slip teeth to clamp the weeds. Although both have certain effects, they still have the following drawbacks: First, the gaps in the densely arranged serrated structure are prone to clogging with debris, especially in field operations where soil is inevitably added to the grooves of the teeth and is difficult to clean. If not cleaned in time, the straw will lose its restraint, making it difficult to improve cutting efficiency. Second, the serrated structure is relatively complex, which increases the difficulty of processing and forming the cutter guard and results in high manufacturing costs. Utility Model Content

[0006] The purpose of this invention is to provide a blade protector with a simple structure that provides reliable restraint for straw, weeds, and branches, thereby improving cutting efficiency.

[0007] This utility model can be achieved through the following technical solution: a knife guard, wherein an upper blade guard wall and a lower blade guard wall are provided on the left and right sides of the front end of the knife guard body, and the upper and lower blade guard walls are arranged at intervals to form a cavity for arranging cutting tools. The upper or lower blade guard wall is provided with a recess on the left and right sides, and the surface of the recess is an arc-shaped contour.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] Because the concave opening area with an arc-shaped contour is large, it confines the straw within the concave area, preventing the straw from being pushed along the upper guard wall towards the direction of vehicle movement during the cutting process and slipping off the top of the cutting blade teeth, thus ensuring that the cutting blade can cut the straw and improving cutting efficiency. On the other hand, it can also reduce clogging caused by dirt and other impurities. Attached Figure Description

[0010] Figure 1 , 2 This is a schematic diagram of the blade protector in Example 1;

[0011] Figure 3 This is a side view of the knife guard in Example 1;

[0012] Figure 4a , 4b This is a top view of the knife guard in Example 1;

[0013] Figure 5 for Figure 4a Sectional view at CC;

[0014] Figure 6 for Figure 4b Enlarged view of a section at point E in the middle;

[0015] Figure 7 , 8 This is a schematic diagram of the blade protector in Example 2;

[0016] Figure 9 This is a side view of the knife guard in Example 2;

[0017] Figure 10a , 10b This is a top view of the knife guard in Example 2;

[0018] Figure 11 for Figure 10a Sectional view at point DD. Detailed Implementation

[0019] Example 1

[0020] Please see Figure 1-6As shown, a blade protector has an upper blade guard wall 11 and a lower blade guard wall 12 on the left and right sides of the front end of the blade protector body 10. The upper blade guard wall 11 and the lower blade guard wall 12 are arranged at intervals to form a cavity for arranging the cutting blade A in a groove 13. The upper blade guard wall 11 has recesses 14 on the left and right sides, and the surface of the recesses 14 has an arc-shaped contour. When the harvester harvests straw B (or other herbaceous plants), the cutting blade A moves back and forth in the groove 13, and the direction of movement is perpendicular to the length direction of the upper blade guard wall 11. During the cutting process, when the toothed edge A1 of the cutting tool A approaches the recess 14, the first constraint area formed is a narrowing shape where the distance between the toothed edge A1 and the front end of the recess 14 is small, and the distance between the toothed edge A1 and the middle part of the recess 14 is large. This continues until the toothed edge A1 first intersects with the front end of the recess 14 and then intersects with the middle and rear contour of the recess 14, completely eliminating the phenomenon of missing straw B and improving cutting efficiency. On the other hand, the large opening area of ​​the recess 14 with its arc-shaped contour can also reduce the clogging caused by dirt and other impurities. Even if dirt adheres to the recess 14, it significantly reduces the amount of cleaning work, and even if cleaning is required, it is very convenient.

[0021] like Figure 5 As shown, the curvature of the arc-shaped contour decreases from the front end to the rear end of the blade protector body 10. This setting makes the curvature of the front area of ​​the recess 14 greater than that of the rear area of ​​the recess 14, so that the area enclosed by the front contour of the recess 14 clearly forms a hook-shaped area with the mouth facing the side and rear. This further ensures that the constraint area formed when the front end of the recess 14 first intersects with the toothed blade A1 will firmly hold the straw B, and the cutting blade A will quickly cut the straw B.

[0022] like Figure 6 As shown, the bottom surface of the upper guard wall 11 and the surface of the recess 14 are arranged at an acute angle; this arrangement makes the bottom surface of the upper guard wall 11 and the surface of the recess 14 form a cutting edge, which, when combined with the cutting tool A, is more conducive to cutting straw B.

[0023] Example 2

[0024] Please see Figure 7-11 As shown, a knife guard has an upper blade guard wall 11 and a lower blade guard wall 12 on the left and right sides of the front end of the knife guard body 10. The upper blade guard wall 11 and the lower blade guard wall 12 are arranged at intervals to form a cavity for arranging the cutting tool A. The lower blade guard wall 12 has recesses 14 on the left and right sides, and the surface of the recesses 14 has an arc-shaped contour. In this embodiment, the function and effect of the recesses 14 are the same as those of the recesses 14 in embodiment 1.

[0025] The curvature of the arc-shaped profile decreases from the front end to the rear end of the blade protector body 10. In this embodiment, this setting is also to further ensure that the constraint area formed when the front end of the recess 14 first intersects with the toothed blade A1 will firmly surround the straw B, and the cutting blade A will quickly cut the straw B.

[0026] like Figure 11 As shown, the top surface of the lower guard wall 12 and the surface of the recess 14 are arranged at an acute angle; in this embodiment, the top surface of the lower guard wall 12 and the surface of the recess 14 also form a cutting edge, which cooperates with the cutting edge of the cutting tool A, which is beneficial to cutting the straw B.

[0027] In this application, the blade guard body 10 can have the following structure:

[0028] The blade protector body 10 includes a connecting plate 15 connected to the harvester frame and a lower blade guard wall 12 connected to the front side of the connecting plate 15. The connecting plate 15 has connecting holes 151 at both ends. A conical block 16 is connected to the front end of the lower blade guard wall 12, and the front end of the upper blade guard wall 11 is connected to the conical block 16. The rear ends of the two lower blade guard walls 12 are connected by connecting ribs 17. A first reinforcing rib 111 is provided on the top surface of the upper blade guard wall 11, and a second reinforcing rib 121 is provided on the bottom surface of the lower blade guard wall 12. The rear end of the blade protector body 10 is connected to the harvester frame through the connecting holes 151 at both ends of the connecting plate 15. The blade protector body 10 moves with the harvester, and the cutting blade A reciprocates in the cutting groove 13 formed by the upper blade guard wall 11 and the lower blade guard wall 12 to cut the straw B.

Claims

1. A blade protector, wherein an upper blade guard wall (11) and a lower blade guard wall (12) are provided on the left and right sides of the front end of the blade protector body (10), and the clamping cavity formed by the upper blade guard wall (11) and the lower blade guard wall (12) arranged at intervals is a tool groove (13) for arranging a cutting tool (A), characterized in that: The upper guard wall (11) or the lower guard wall (12) has recesses (14) on the left and right sides, and the surface of the recesses (14) has an arc-shaped profile.

2. The knife guard according to claim 1, characterized in that: The curvature of the arc-shaped profile decreases from the front end to the rear end of the main body (10) of the blade protector.

3. The knife guard according to claim 2, characterized in that: The bottom surface of the upper guard wall (11) and the surface of the recess (14) are arranged at an acute angle.

4. The knife guard according to claim 2, characterized in that: The top surface of the lower guard wall (12) and the surface of the recess (14) are arranged at an acute angle.

5. The knife guard according to claim 1, 2, 3, or 4, characterized in that: The blade protector body (10) includes a connecting plate (15) connected to the harvester frame and a lower blade guard wall (12) connected to the front side of the connecting plate (15).

6. The knife guard according to claim 5, characterized in that: The connecting plate (15) has connecting holes (151) at both ends.

7. The knife guard according to claim 1, 2, 3, or 4, characterized in that: The front end of the lower guard wall (12) is connected to a conical block (16), and the front end of the upper guard wall (11) is connected to the conical block (16).

8. The knife guard according to claim 1, 2, 3, or 4, characterized in that: The rear ends of the two lower guard walls (12) are connected by a connecting rib plate (17).

9. The knife guard according to claim 1, 2, 3, or 4, characterized in that: The top surface of the upper guard wall (11) is provided with a first reinforcing rib (111), and the bottom surface of the lower guard wall (12) is provided with a second reinforcing rib (121).

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