Blade protector for harvester

Abstract

The utility model belongs to the technical field of agricultural mechanical parts, and particularly relates to a blade protector for a harvester, which comprises a protective cover, an upper cover body or a lower cover body of the protective cover extends backwards to form a bracket used for being fixedly connected with a rack, and a core block is arranged between the upper cover body and the lower cover body of the protective cover. The core block is an inverted-U-shaped block with an opening pointing to the rear side of the machine frame, a concave cavity of the core block forms a cutter groove allowing the cutter to pass through, and the core block is made of materials with the abrasion resistance superior to that of the protective cover. The core block with better wear resistance is embedded in the protective cover, and the concave cavity of the core block forms the cutter groove, so that the groove wall of the cutter groove in direct contact with the cutter is made of a material with better wear resistance, the wear speed of the groove wall of the cutter groove can be effectively slowed down, and the service life of the edge protector is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of agricultural machinery parts, and particularly relates to a ledger plate for a harvester. Background Art

[0002] The harvester realizes the cutting of crops by driving the cutting blade to reciprocate horizontally along the direction perpendicular to the advancing direction of the harvester. Since the cutting blade usually has low strength, the prior art usually sets a ledger plate to protect the cutting blade from being damaged by bumping against hard objects. The contact surfaces of the ledger plate with the blade and the crop stalks are extremely prone to wear. When the wear amount is too large, the entire ledger plate needs to be replaced. In addition, most of the existing ledger plates are produced by casting. The worn or cast-defective ledger plates are extremely prone to breakage when bumping against hard objects, resulting in a short service life of the ledger plate. Content of the Utility Model

[0003] The purpose of the utility model is to provide a ledger plate for a harvester with good wear resistance and durability.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a ledger plate for a harvester, including a protective cover. The upper cover or the lower cover of the protective cover extends backward to form a bracket for fixedly connecting with the frame. A core block is arranged between the upper cover and the lower cover of the protective cover. The core block is an inverted U-shaped block with an opening pointing to the rear side of the frame, and its concave cavity forms a knife groove for the cutter to pass through. The core block is made of a material with better wear resistance than the protective cover.

[0005] Compared with the prior art, the utility model has the following technical effects: A core block with better wear resistance is embedded in the protective cover, and the concave cavity of the core block forms a knife groove. In this way, the groove wall of the knife groove in direct contact with the cutter is made of a material with better wear resistance, which can effectively slow down the wear speed of the groove wall of the knife groove, thereby extending the service life of the ledger plate. Description of the Drawings

[0006] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0007] Figure 1 is the three-dimensional schematic diagram of the utility model;

[0008] Figure 2 、 3 is the three-dimensional schematic diagram of the disassembled state of the utility model. Detailed Description of the Invention

[0009] The following further details the specific implementation manners of the utility model by describing the embodiments in conjunction with the drawings.

[0010] For ease of description, the front side described below refers to the forward direction of the harvester, and the rear side refers to the side opposite to the forward direction of the harvester, that is, the front side is the side of the harvester facing the crops to be harvested, and the rear side is the side where the harvester has completed harvesting.

[0011] A blade guard for a harvester includes a bracket 12 fixedly connected to a frame, and a cantilevered shield 11 is connected to the front side of the frame of the bracket 12. The shield 10 includes an upper shield 111 and a lower shield 112, and a core block 20 is arranged between the upper shield 111 and the lower shield 112. The core block 20 is an inverted U-shaped block with an opening pointing to the rear side of the frame and a concave cavity thereof forming a knife groove 13 for a cutter to pass through. The core block 20 is made of a material with better wear resistance than the shield 11. The shield 11 and the bracket 12 constitute the main body of the blade guard, and the main body and the core block 20 are made of different materials to meet different performance requirements of the two. The blade guard body can be made of a low-cost material with good strength and toughness to reduce the production cost of the blade guard and improve production efficiency. The core block 20 can be made of wear-resistant steel with good wear resistance. In a more preferred solution, the core block 20 is made of ceramic, which has a strong hardness, and the wear resistance of the wear-resistant ceramic is better than that of wear-resistant steel. The groove wall of the knife groove 13 in direct contact with the cutting knife is made of a material with better wear resistance, which can effectively slow down the wear rate of the groove wall of the knife groove 13, thereby avoiding cracking or even breaking of the shield 11 caused by severe wear of the knife groove 13, thereby extending the service life of the blade guard.

[0012] In a preferred embodiment, the shield 11 and the bracket 12 are integrally formed structures, and the core block 20 is encapsulated and fixed inside the shield 11. For example, the blade guard body is made of a polymer material, the shield 11 and the bracket 12 are integrally injection molded, and during the molding process of the blade guard body, the core block 20 is encapsulated and fixed inside the shield 11, thereby obtaining a blade guard product with good overall performance. The blade guard body can also be cast by metal material.

[0013] In other embodiments, the upper cover body 111 , the lower cover body 112 , and the core block 20 of the shield 11 may also form a detachable fit.

[0014] In order to realize accurate and reliable positioning of the core block 20 in the shield 11, a positioning assembly is provided between the core block 20 and the shield 11. The positioning assembly includes a positioning boss 31 and a positioning groove 32. The groove cavity contour of the positioning groove 32 matches the outer peripheral contour of the positioning boss 31. The positioning boss 31 is accommodated in the positioning groove 32 to limit the relative displacement of the core block 20 and the shield 11. Figure 2 , 3In the illustrated embodiment, positioning bosses 31 are respectively provided on the upper and lower parts of the core block 20, and positioning grooves 32 are correspondingly provided on the upper cover 111 and the lower cover 112. In other embodiments, positioning grooves 32 may also be respectively provided on the upper and lower surfaces of the core block 20, and positioning bosses 31 may be correspondingly provided on the upper cover 111 and the lower cover 112.

[0015] As shown in the Figure 1 accompanying drawings, the arrangement position of the core block 20 is adjacent to the bracket 12, that is, the body of the core block 20 is rearward, and the rear end surface of the core block 20 is flush with the rear end surface of the shield 11. In this way, the notch of the cutter groove 13 is formed by enclosing with materials having higher hardness and better wear resistance, which can effectively ensure the stability of the shape profile of the notch of the cutter groove 13. The rear end surface of the positioning boss 31 is spaced from the rear end surface of the core block 20. In this way, the cooperation between the positioning boss 31 and the positioning groove 32 can limit the displacement of the core block 20 in the front-rear direction of the frame, thereby preventing the core block 20 from moving backward along the depth direction of the cutter groove 13 and disengaging from between the upper cover 111 and the lower cover 112.

[0016] As shown in the Figure 2 and 3 accompanying drawings of the illustrated embodiment, the shield 11 is integrally in the shape of a wedge with a smaller front and a larger rear, and the side contours of the core block 20 are consistent with the side contours of the shield 11, and the overall shape is a trapezoidal block with a smaller front and a larger rear. This can guide the crop to smoothly enter the airspace formed by enclosing the two shields 11 and the bracket 12, so that the cutter can cut the crop in the enclosed area.

[0017] In a preferred solution, the side surface of the core block 20 is exposed. During the cutting operation, the cutting blade presses the crop stalk against the side of the shield 11. The side groove surface of the cutter groove 13 comes into contact with the crop stalk most frequently and also needs to bear the tangential force, and is most easily worn. The exposed arrangement of the side surface of the core block 20 enables the crop stalk to be pressed against and contact with materials having better wear resistance, which can reduce the wear of the shield 11 during the cutting operation. Specifically, the side surface of the core block 20 is flush with the side surface of the shield 11, or a boss is formed on the side of the core block 20 at the side of the shield 11. Among them, the side boss formed on the core block 20 enables the side surface of the core block 20 to come into contact with the crop stalk preferentially, thereby further reducing the wear of the shield 11 covering its outside, but it may retain stains or cause crop jams.

[0018] As shown in the Figure 2 and 3In the illustrated embodiment, the front of the upper cover 111 and the lower cover 112 are detachably connected, and the rear forms an airspace for accommodating the core block 20. Specifically, the lower cover 112 is provided with a positioning hole 41 and a lower connecting hole 42, and the upper cover 111 is correspondingly provided with a positioning column 43 and an upper connecting hole 44, the column center of the positioning column 43 is parallel to the hole core of the upper connecting hole 44 and the lower connecting hole 42, the positioning column 43 is inserted into the positioning hole 41 to limit the displacement of the upper cover 111 and the lower cover 112 in a direction perpendicular to the column center of the positioning column 43, and the upper connecting hole 44 and the lower connecting hole 42 are screwed to realize the connection between the upper cover 111 and the lower cover 112.

[0019] Attached Figure 2 In the embodiment shown, the lower cover 112 extends backward to form the bracket 12, and the lower cover 112 and the bracket 12 are an integrally formed structure, so that the upper part of the bracket 12 is exposed, which is convenient for maintenance personnel to observe the installation posture of the blade guard and the cutter. In other embodiments, the upper cover 111 can also be extended backward to form the bracket 12.

[0020] As attached Figure 1 As shown, the bracket 12 includes a bracket arm 121 whose arm length direction is parallel to the groove depth direction of the knife groove 13. The front end of the bracket arm 121 is connected to the shield 11, and the rear end is connected to the frame. The bracket arm 121 and the shield 11 are arranged one by one. When a single blade guard has two or more shields 11, the sides of adjacent bracket arms 121 are connected by connecting rods 122. Figure 1 , 2 In the embodiment shown in FIG. 3 , one bracket 12 connects two shields 11 . In other embodiments, the bracket 12 may also connect one shield 11 or three or more shields 11 .

[0021] In the preferred embodiment, the front section of the support arm 121 is an arc-shaped arm 1211 that avoids the upper opening of the blade assembly. The avoidance recess of the arc-shaped arm 1211 can accommodate the screw head or nut of the cutter installation to avoid interference with the support arm 121, thereby affecting the reciprocating motion of the cutter in the direction perpendicular to the length of the support arm 121. The rear section of the support arm 121 is a straight arm 1212. The straight arm 1212 is arranged at a different height from the lower cover body 112, and the upper surface of the straight arm 1212 is arranged lower than the upper surface of the lower cover body 112. The upper part of the straight arm 1212 avoids the cutter body of the cutter. A mounting hole 123 is provided at the rear end of the straight arm 1212, and the connecting rod 122 is connected to the straight arm 1212.

Claims

1. A blade guard for a harvester, characterized in that: The invention comprises a shield (11), an upper shield body (111) or a lower shield body (112) of the shield (11) extending backward to form a bracket (12) for being fixedly connected to a frame, a core block (20) being arranged between the upper shield body (111) and the lower shield body (112) of the shield (11), the core block (20) being an inverted U-shaped block with an opening pointing toward the rear side of the frame and a concave cavity thereof forming a knife groove (13) for a cutter to pass through, and the core block (20) being made of a material having better wear resistance than the shield (11).

2. The blade guard for a harvester according to claim 1, characterized in that: A positioning assembly is provided between the core block (20) and the shield (11), the positioning assembly comprising a positioning boss (31) and a positioning groove (32), the groove cavity profile of the positioning groove (32) coincides with the outer peripheral profile of the positioning boss (31), and the positioning boss (31) is accommodated in the positioning groove (32) to limit the relative displacement between the core block (20) and the shield (11).

3. The blade guard for a harvester according to claim 2, characterized in that: In the positioning assembly, the upper and lower parts of the core block (20) are respectively provided with positioning bosses (31), and the upper cover body (111) and the lower cover body (112) are respectively provided with corresponding positioning grooves (32).

4. The blade guard for a harvester according to claim 3, characterized in that: The core block (20) is arranged adjacent to the bracket (12) and its rear end face is arranged flush with the rear end face of the shield (11); the rear end face of the positioning boss (31) is arranged at a distance from the rear end face of the core block (20); the shield (11) is wedge-shaped as a whole with a small front and a large rear, and the core block (20) is a trapezoidal block with a small front and a large rear.

5. The blade guard for a harvester according to claim 4, characterized in that: The shield (11) and the bracket (12) are an integrally formed structure, and the core block (20) is wrapped and fixed inside the shield (11).

6. The blade guard for a harvester according to claim 4, characterized in that: The upper cover body (111), the lower cover body (112), and the core block (20) form a detachable fit.

7. The blade guard for a harvester according to claim 6, characterized in that: The front parts of the upper cover body (111) and the lower cover body (112) are detachably connected, and the rear parts form an airspace for accommodating the core block (20); the lower cover body (112) is provided with a positioning hole (41) and a lower connecting hole (42); the upper cover body (111) is correspondingly provided with a positioning column (43) and an upper connecting hole (44); the column center of the positioning column (43) is parallel to the hole cores of the upper connecting hole (44) and the lower connecting hole (42); the positioning column (43) is inserted into the positioning hole (41) to limit the displacement of the upper cover body (111) and the lower cover body (112) in a direction perpendicular to the column center of the positioning column (43); the upper connecting hole (44) and the lower connecting hole (42) are connected by screw threads to realize the connection between the upper cover body (111) and the lower cover body (112); the lower cover body (112) and the bracket (12) are an integrally formed structure.

8. The blade guard for a harvester according to any one of claims 1 to 7, characterized in that: The side surface of the core block (20) is exposed; the side surface of the core block (20) is aligned with the side surface of the shield (11), or the side of the core block (20) forms a boss on the side of the shield (11).

9. The blade guard for a harvester according to claim 1, characterized in that: The bracket (12) comprises a bracket arm (121) whose arm length direction is parallel to the groove depth direction of the knife groove (13); the front end of the bracket arm (121) is connected to the guard (11), and the rear end is connected to the frame; the bracket arm (121) and the guard (11) are arranged in a one-to-one correspondence; when a single blade guard has two or more guards (11), the side portions of adjacent bracket arms (121) are connected via a connecting rod (122); The front section of the support arm (121) is an arc-shaped arm (1211) for avoiding the upper opening of the blade assembly, and the rear section of the support arm (121) is a straight arm (1212). The straight arm (1212) and the lower cover body (112) are arranged at different heights, and the upper surface of the straight arm (1212) is arranged lower than the upper surface of the lower cover body (112). A mounting hole (123) is provided at the rear end of the straight arm (1212), and the connecting rod (122) is connected to the straight arm (1212).

10. The blade guard for a harvester according to claim 1, characterized in that: The core block (20) is made of ceramic, and other parts of the blade guard are made of polymer material or metal material.

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