Lawn mower blade quick change structure

Abstract

The utility model relates to agricultural machinery technical field, concretely relates to weeding machine blade quick replacement structure, including from below to above set up blade assembly, connecting frame and fixed frame, the fixed frame is connected with the output shaft of external weeding machine, the blade assembly includes the center disc, the center disc circumferential outer plate welds the blade body of a plurality of, the center disc top integral moulding has a connecting shaft, the utility model discloses through set up from below to above blade assembly, connecting frame and the layered structure of fixed frame, and connecting shaft, connecting column, lower insertion block and the insertion cooperation of connecting frame, combine the fixed mode of screw rod and nut, realized the quick dismounting of blade assembly and connecting frame, simplified the replacement process of weeding machine blade, can through the depth of nut adjustment lower insertion block inserts the depth of insertion hole simultaneously, and then can adjust the height of blade assembly, increased the convenience when using.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, specifically to a quick-change structure for weeding machine blades. Background Technology

[0002] In agricultural and horticultural operations, weeders are commonly used equipment. Their blades, due to prolonged cutting of weeds, straw, and other vegetation, are prone to wear, deformation, or damage, requiring regular replacement. However, traditional weeder blade mounting structures typically use bolt fixing or integrated connections, which presents the following technical problems:

[0003] Traditional designs require the complete disassembly of the blade assembly and output shaft, sometimes involving the disassembly and reassembly of multiple components. This results in long replacement times and low efficiency, especially in large-area operations where frequent downtime for blade replacement significantly impacts work progress. Furthermore, the fixed height of traditional blades prevents flexible adjustment based on lawn height, crop growth stage, and other factors, limiting the equipment's applicability. For instance, different blade heights are required for weeding low-lying lawns and tall crops, which the fixed structure cannot accommodate.

[0004] In light of this, we propose a quick-change mechanism for weed cutter blades. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a quick-change structure for weed cutter blades.

[0006] The technical solution of this utility model is:

[0007] The quick-change blade structure for a weed cutter includes a blade assembly, a connecting frame, and a fixing frame arranged from bottom to top. The fixing frame is connected to the output shaft of an external weed cutter. The blade assembly includes a central disc, on which several blade bodies are welded. A connecting shaft is integrally formed on the top of the central disc, and a connecting post is integrally formed on the top of the connecting shaft. A lower insertion block is integrally formed on the connecting post. The connecting frame includes a fixing post, on which an insertion hole for insertion into the lower insertion block is opened at the bottom. Several screws arranged in a circular array are welded to the bottom of the fixing post. The screws pass through the connecting post, and nuts are threaded onto any two symmetrical screws. The nuts are located below the connecting post. By setting up a layered structure of blade assembly, connecting frame and fixing frame from bottom to top, and the plug-in cooperation of connecting shaft, connecting column, lower insert block and connecting frame, combined with the fixing method of screw and nut, the blade assembly and connecting frame can be quickly disassembled and assembled, simplifying the blade replacement process of weed cutter. At the same time, the depth of the lower insert block inserted into the hole can be adjusted by the nut, thereby adjusting the height of the blade assembly, increasing the convenience of use.

[0008] As a preferred technical solution, the outer ring wall of the lower insertion block is tightly fitted to the inner wall of the insertion hole, ensuring the tightness of the connection between the lower insertion block and the insertion hole. The length of the screw is equal to the length of the lower insertion block, ensuring that the screw length can meet the adjustment of the insertion depth of the lower insertion block.

[0009] As a preferred technical solution, the fixing frame includes a fixing block, with an upper flange integrally formed coaxially at the bottom of the fixing block and a lower flange integrally formed coaxially at the top of the fixing column. The two flanges are fixed together by a number of fixing bolts. This flange connection method not only facilitates quick assembly and disassembly between the fixing frame and the connecting frame, but also ensures the coaxiality and stability of the connection, enabling the power from the output shaft of the external weeder to be stably transmitted to the blade assembly, thus improving power transmission efficiency.

[0010] As a preferred technical solution, the top of the fixing block is coaxially and integrally formed with an upper insertion block, which is plugged into and connected to the output shaft of the external weeding machine. This plug-in structure allows for quick initial positioning and connection between the fixing frame and the output shaft, facilitating subsequent fixing.

[0011] As a preferred technical solution, a threaded sleeve is provided on the outer side of the fixing block, and an inner convex ring is integrally formed at the bottom of the inner wall of the threaded sleeve. An annular groove is formed on the outer circumference of the fixing block, which rotatably connects with the inner convex ring. The threaded sleeve is rotatably connected to the annular groove of the fixing block through the inner convex ring, allowing the threaded sleeve to rotate relative to the fixing block. This does not affect the insertion and positioning of the fixing block and the output shaft, and provides a structural basis for the subsequent threaded connection between the threaded sleeve and the output shaft. This achieves a dual connection and fixation between the fixing frame and the output shaft, enhancing the stability of the connection.

[0012] As a preferred technical solution, the inner diameter of the threaded sleeve is equal to the diameter of the output shaft of the external weeder, and the threaded sleeve is threadedly connected to the outer wall of the output shaft of the external weeder. This can tightly fix the fixing frame and the output shaft together, preventing relative rotation or loosening between the fixing frame and the output shaft during the operation of the weeder, ensuring that power can be efficiently and stably transmitted to the blade assembly. At the same time, the threaded connection method also facilitates the disassembly and maintenance of the fixing frame.

[0013] As a preferred technical solution, the connecting post has several through holes for the screw to pass through, and the diameter of the through holes is directly equal to that of the screw. The diameter of the through holes on the connecting post is equal to the diameter of the screw, allowing the screw to pass precisely through the connecting post, ensuring a tight fit between the screw and the connecting post, and preventing the screw from wobbling within the through holes.

[0014] As a preferred technical solution, both the upper and lower insert blocks have non-circular cross-sections, and the insertion hole is adapted to the shape of the lower insert block. This non-circular structure can effectively transmit torque and prevent relative slippage between the upper insert block and the output shaft, and between the lower insert block and the insertion hole, during power transmission. This ensures the effectiveness and stability of power transmission and guarantees that the blade assembly can perform weeding operations stably and efficiently.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention achieves quick assembly and disassembly of the blade assembly and connecting frame by setting up a layered structure of blade assembly, connecting frame and fixing frame from bottom to top, and by inserting the connecting shaft, connecting column, lower insert block and connecting frame together, combined with the fixing method of screw and nut. This simplifies the blade replacement process of weed cutter. At the same time, the depth of the lower insert block inserted into the insertion hole can be adjusted by the nut, thereby adjusting the height of the blade assembly, increasing the convenience of use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 In this utility model Figure 1 A schematic diagram of the front view structure;

[0019] Figure 3 This is a schematic diagram of the blade assembly structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the connecting frame in this utility model;

[0021] Figure 5 This is a schematic diagram of the fixing frame structure in this utility model.

[0022] The meanings of the labels in the diagram are as follows:

[0023] 1. Blade assembly; 10. Center plate; 11. Blade body; 12. Connecting post; 13. Lower insert block; 14. Connecting shaft; 15. Through hole; 2. Connecting bracket; 20. Fixing post; 21. Screw; 22. Nut; 23. Lower flange; 24. Insertion hole; 3. Fixing bracket; 30. Fixing block; 31. Upper flange; 32. Upper insert block; 33. Annular groove; 34. Threaded sleeve; 35. Inner convex ring; 4. Fixing bolt. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-5 This utility model provides a technical solution:

[0026] The quick-change structure for weed cutter blades includes a blade assembly 1, a connecting frame 2, and a fixing frame 3 arranged from bottom to top. The fixing frame 3 is connected to the output shaft of an external weed cutter. The blade assembly 1 includes a central disc 10, with several blade bodies 11 welded to the outer circumference of the central disc 10. A connecting shaft 14 is integrally formed on the top of the central disc 10, and a connecting post 12 is integrally formed on the top of the connecting shaft 14. A lower insertion block 13 is integrally formed on the connecting post 12. The connecting frame 2 includes a fixing post 20, with an insertion hole 24 at the bottom of the fixing post 20 for insertion into the lower insertion block 13. Several screws 21 arranged in a circular array are welded to the bottom of the fixing post 20. The screws 21 pass through the connecting post 12, and nuts 22 are threaded onto any two symmetrical screws 21. The nuts 22 are located below the connecting post 12. By setting up a layered structure of blade assembly 1, connecting frame 2 and fixing frame 3 from bottom to top, and by inserting connecting shaft 14, connecting column 12, lower insert block 13 and connecting frame 2 together, combined with the fixing method of screw 21 and nut 22, the blade assembly 1 and connecting frame 2 can be quickly disassembled and assembled, simplifying the blade replacement process of the weed cutter. At the same time, the depth of the lower insert block 13 inserted into the insertion hole 24 can be adjusted by the nut 22, thereby adjusting the height of the blade assembly 1, increasing the convenience of use.

[0027] In a preferred embodiment, the outer ring wall of the lower insertion block 13 is tightly fitted to the inner wall of the insertion hole 24, ensuring the tightness of the connection between the lower insertion block 13 and the insertion hole 24. The length of the screw 21 is equal to the length of the lower insertion block 13, ensuring that the length of the screw 21 can meet the adjustment of the insertion depth of the lower insertion block 13.

[0028] In a preferred embodiment, the fixing frame 3 includes a fixing block 30. The bottom of the fixing block 30 has an upper flange 31 integrally formed coaxially, and the top of the fixing column 20 has a lower flange 23 integrally formed coaxially. The two flanges are fixed together by several fixing bolts 4. This flange connection method not only facilitates quick assembly and disassembly between the fixing frame 3 and the connecting frame 2, but also ensures the coaxiality and stability of their connection, enabling the power from the output shaft of the external weeder to be stably transmitted to the blade assembly 1, thus improving power transmission efficiency.

[0029] In a preferred embodiment, the top of the fixing block 30 is coaxially integrally formed with an upper insertion block 32, which is plugged into the output shaft of the external weeding machine. The plug-in structure can quickly achieve the initial positioning and connection between the fixing frame 3 and the output shaft, facilitating subsequent fixing.

[0030] In a preferred embodiment, a threaded sleeve 34 is provided on the outer side of the fixing block 30. An inner convex ring 35 is integrally formed at the bottom of the inner wall of the threaded sleeve 34. An annular groove 33, rotatably connected to the inner convex ring 35, is formed on the outer circumference of the fixing block 30. The threaded sleeve 34 is rotatably connected to the annular groove 33 of the fixing block 30 via the inner convex ring 35, allowing the threaded sleeve 34 to rotate relative to the fixing block 30. This does not affect the insertion and positioning of the fixing block 30 and the output shaft, and provides a structural basis for the subsequent threaded connection between the threaded sleeve 34 and the output shaft. This achieves a dual connection and fixation between the fixing frame 3 and the output shaft, enhancing the stability of the connection.

[0031] In a preferred embodiment, the inner diameter of the threaded sleeve 34 is equal to the diameter of the output shaft of the external weeder, and the threaded sleeve 34 is threadedly connected to the outer wall of the output shaft of the external weeder. This can tightly fix the fixing frame 3 to the output shaft, preventing relative rotation or loosening between the fixing frame 3 and the output shaft during the operation of the weeder, ensuring that power can be efficiently and stably transmitted to the blade assembly 1. At the same time, the threaded connection method also facilitates the disassembly and maintenance of the fixing frame 3.

[0032] In a preferred embodiment, the connecting post 12 has several through holes 15 for the screw 21 to pass through, and the diameter of the through holes 15 is directly equal to that of the screw 21. The diameter of the through holes 15 on the connecting post 12 is equal to that of the screw 21, so that the screw 21 can pass through the connecting post 12 accurately, ensuring a tight fit between the screw 21 and the connecting post 12 and preventing the screw 21 from shaking in the through holes 15.

[0033] As a preferred embodiment, both the upper insertion block 32 and the lower insertion block 13 have non-circular cross-sections, and the insertion hole 24 is adapted to the shape of the lower insertion block 13. This non-circular structure can effectively transmit torque and prevent relative slippage between the upper insertion block 32 and the output shaft, and between the lower insertion block 13 and the insertion hole 24, during power transmission. This ensures the effectiveness and stability of power transmission and guarantees that the blade assembly 1 can perform weeding operations stably and efficiently.

[0034] In use, the quick-change blade structure for a weeder of this utility model involves the output shaft of an external weeder engaging with the upper insert block 32 on the top of a fixed block 30 via a plug-in connection. An outer threaded sleeve 34 is threadedly connected to the outer wall of the output shaft. The inner convex ring 35 of the threaded sleeve 34 is rotatably connected to the annular groove 33 of the fixed block 30 to ensure coaxiality. After power is transmitted to the fixed frame 3, the upper flange 31 at the bottom of the fixed block 30 is connected to the lower flange 23 of the fixing column 20 of the connecting frame 2 via fixing bolts 4. Power is transmitted through the fixing column 20, whose bottom insertion hole 24 is tightly engaged with the lower insert block 13 of the connecting column 12 of the blade assembly 1. The non-circular cross-section prevents slippage. After the screw 21 passes through the hole 15 of the connecting post 12, it is fixed with the nut 22. The power is transmitted to the central plate 10 and the blade body 11 to drive the rotation for weeding. When changing the blade, the lower insert 13 can be removed by unscrewing the nut 22. When installing, the lower insert 13 is inserted and the nut 22 is tightened to complete the fixation. The layered structure enables quick disassembly and assembly. In addition, the insertion depth of the lower insert 13 can be adjusted by turning the nut 22 to change the height of the blade assembly 1 to adapt to different weeding scenarios. The design of the lower insert 13 fitting tightly with the insertion hole 24, the screw 21 having the same diameter as the hole 15, and the flange connection ensuring coaxiality reduces gaps and vibrations and ensures structural stability.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A quick-change blade structure for a weed cutter, characterized in that: The device includes a blade assembly (1), a connecting frame (2), and a fixing frame (3) arranged from bottom to top. The fixing frame (3) is connected to the output shaft of an external weeding machine. The blade assembly (1) includes a central disc (10). Several blade bodies (11) are welded to the outer circumference of the central disc (10). A connecting shaft (14) is integrally formed on the top of the central disc (10). A connecting post (12) is integrally formed on the top of the connecting shaft (14). A lower insert block (13) is integrally formed on the connecting post (12). The connecting frame (2) includes a fixing post (20). The bottom of the fixing post (20) is provided with a socket (24) for insertion into the lower insert block (13). Several screws (21) arranged in a circular array are welded to the bottom of the fixing post (20). The screws (21) pass through the connecting post (12), and nuts (22) are threaded on any two symmetrical screws (21). The nuts (22) are located below the connecting post (12).

2. The quick-change blade structure for a weed cutter as described in claim 1, characterized in that: The outer ring wall of the lower insert (13) is in close contact with the inner wall of the insertion hole (24), and the length of the screw (21) is equal to the length of the lower insert (13).

3. The quick-change blade structure for a weed cutter as described in claim 2, characterized in that: The fixing frame (3) includes a fixing block (30), the bottom of the fixing block (30) is integrally formed with an upper flange (31), and the top of the fixing column (20) is integrally formed with a lower flange (23). The two flanges are fixed by a number of fixing bolts (4).

4. The quick-change blade structure for a weed cutter as described in claim 3, characterized in that: The top of the fixing block (30) is integrally formed with an upper insertion block (32), which is connected to the output shaft of the external weeding machine.

5. The quick-change blade structure for a weed cutter as described in claim 4, characterized in that: The fixing block (30) has a threaded sleeve (34) on its outer side. The bottom of the inner wall of the threaded sleeve (34) has an integrally formed inner convex ring (35). The outer circumference of the fixing block (30) has an annular groove (33) that is rotatably connected to the inner convex ring (35).

6. The quick-change blade structure for a weed cutter as described in claim 5, characterized in that: The inner diameter of the threaded sleeve (34) is equal to the diameter of the output shaft of the external weeding machine, and the threaded sleeve (34) is threadedly connected to the outer wall of the output shaft of the external weeding machine.

7. The quick-change blade structure for a weed cutter as described in claim 6, characterized in that: The connecting post (12) has several through holes (15) for the screw (21) to pass through, and the diameter of the through holes (15) is directly equal to that of the screw (21).

8. The quick-change blade structure for a weed cutter as described in claim 7, characterized in that: The cross-sections of the upper plug (32) and the lower plug (13) are both non-circular, and the plug hole (24) is adapted to the shape of the lower plug (13).

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