Brush cutter with anti-winding and blade self-cleaning functions

Abstract

The application discloses a brush cutter with anti-winding and blade self-cleaning functions and relates to the technical field of brush cutters.The brush cutter comprises a machine body, a motor fixedly connected to the upper end of the machine body, a blade fixedly connected to the output shaft of the motor through bolts, an anti-winding mechanism arranged on the blade, a fixed ring fixedly connected to the upper end of the blade, two electric push rods fixedly connected to the upper end of the machine body, a moving ring fixedly connected to the movable ends of the two electric push rods, and the output shaft of the motor penetrating through the inner side walls of the fixed ring and the moving ring.In the application, the electric push rods can automatically adjust the opening angle of the crushing blade according to the rotating speed signals detected by the speed sensor in real time.When the rotating speed decreases, the crushing blade is unfolded outward, the cutting range is expanded, and the winding weeds and vines are actively cut;after the rotating speed returns to normal, the crushing blade is automatically folded, the movement resistance is reduced, the self-adaptive optimization of the anti-winding function is realized, and the motor is prevented from being overloaded due to the accumulation of winding objects.

Description

Technical Field

[0001] This invention relates to the field of brush cutter technology, and in particular to a brush cutter with anti-tangling and blade self-cleaning functions. Background Technology

[0002] Brush cutters are commonly used equipment in agriculture, forestry, and landscaping maintenance. They are mainly used to cut weeds, shrubs, and other vegetation, greatly improving the efficiency of maintenance operations.

[0003] Currently, during brush cutter operation, weeds and vines easily become entangled in the motor output shaft and blade spindle, leading to increased motor load and decreased speed. In severe cases, this can cause the motor to seize up and the equipment to malfunction, affecting not only work efficiency but also shortening the lifespan of the motor and blades. Furthermore, during brush cutter operation, weed sap, soil, debris, and other impurities easily adhere to the blade surface and cutting edge, causing the blades to become dull and increasing cutting resistance. This necessitates frequent manual shutdowns for cleaning, which not only increases the labor intensity of operators but also further reduces the continuity of operations. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention adopts the following technical solution: A brush cutter with anti-tangling and blade self-cleaning functions includes a body, a motor is fixedly connected to the upper end of the body, and a blade is fixedly connected to the output shaft of the motor by bolts. The blade is provided with an anti-tangling mechanism. The anti-entanglement mechanism includes a fixed ring fixedly connected to the upper end of the blade, two electric push rods fixedly connected to the upper end of the machine body, and a movable ring fixedly connected to the movable ends of the two electric push rods. The motor output shaft passes through the inner sidewall of the fixed ring and the movable ring. A plurality of first rods are rotatably connected to the upper end of the fixed ring, and a first ring is rotatably connected to the lower end of the movable ring. A plurality of second rods corresponding one-to-one with the plurality of first rods are rotatably connected to the lower end of the first ring. The sidewalls of the first rods and their corresponding second rods are rotatably connected, and a pulverizing blade is fixedly connected to the sidewalls of the plurality of first rods and the plurality of second rods away from the motor output shaft.

[0005] Preferably, the upper end of the fixed ring is provided with a circular groove, the inner wall of the circular groove is threaded with a threaded ring, the upper end of the threaded ring is fixedly connected with a plurality of first ribs, and the lower end of the movable ring is fixedly connected with a plurality of second ribs, the angles of the plurality of first ribs and the plurality of second ribs are set opposite.

[0006] Preferably, a speed sensor is fixedly connected to the top of the body, and the speed sensor is electrically connected to two electric push rods through an external control mechanism.

[0007] Preferably, the blade is provided with a cleaning mechanism, which includes two opening slots formed on the side wall of the blade. Two rectangular rods are fixedly connected to the inner walls of the two opening slots. A slider is slidably connected to the side walls of two adjacent rectangular rods. A scraper is fixedly connected to the side wall of the two sliders away from the motor. The lower ends of the two scrapers are in contact with the upper end of the blade.

[0008] Preferably, the sidewall of the movable ring is rotatably connected to a second ring, and the sidewall of the second ring is rotatably connected to the upper end of the slider via a third rod.

[0009] Preferably, the slider has a strip-shaped cavity, and the inner walls on both sides of the strip-shaped cavity are provided with sliding grooves. The inner walls of the two sliding grooves are sealed and slidably connected to sliding plates. The side walls of the two sliding plates that are far apart from each other are fixedly connected to spring plates. The upper end of the blade is fixedly connected to a plurality of protrusions corresponding to the spring plates.

[0010] Preferably, a movable block is slidably connected to the inner wall of the strip cavity, and the side wall of the movable block is fixedly connected to the side wall of two slide plates respectively. The side wall of the movable block near the motor is elastically connected to the inner wall of the strip cavity through multiple telescopic springs.

[0011] Preferably, two first frames are fixedly connected to the bottom of the circular groove, a third ring is rotatably connected to the lower end of the threaded ring, T-shaped plates are slidably connected to the inner walls of the two first frames, and the upper ends of the two T-shaped plates are fixedly connected to the lower end of the third ring.

[0012] Preferably, a second frame is fixedly connected to the sidewalls of the two strip cavities away from the telescopic spring, and the two second frames correspond one-to-one with the two first frames. A pressing rod is slidably connected to the inner wall of the second frame, and the sidewall of the pressing rod is fixedly connected to the sidewall of the moving block. The inner wall of the second frame is fixedly connected to the inner wall of the corresponding first frame through a connecting pipe. Hydraulic oil is provided in both the first and second frames.

[0013] The present invention has the following beneficial effects: 1. The electric push rod can automatically adjust the opening angle of the shredder blade according to the speed signal detected in real time by the speed sensor. When the speed drops (indicating that there is too much tangled material), the shredder blade expands outward to increase the cutting range and actively shred the tangled weeds and vines. After the speed returns to normal, it automatically retracts to reduce motion resistance. This achieves adaptive optimization of the anti-tangling function and avoids motor overload due to the accumulation of tangled material.

[0014] 2. The shredders on the first and second rods are responsible for cutting off longer and thicker weed vines; the first rib on the fixed ring and the second rib on the moving ring produce an alternating shearing action when the moving ring moves up and down, further shredding the fine tangled fibers. The two work together to form a three-dimensional shredding structure, which effectively prevents plant residues of various sizes from tangling on the output shaft and improves the anti-tangling effect.

[0015] 3. When the moving ring moves up and down along the motor output shaft, it drives the scraper to move back and forth along the blade surface. The scraper cleans the upper surface of the blade, preventing local debris from remaining on the blade edge and surface, preventing the blade edge from being blocked or dulled by debris, ensuring that the blade always remains sharp, ensuring smooth cutting during the cutting process, and avoiding incomplete cutting and reduced efficiency due to debris obstruction.

[0016] 4. The intermittent increase and decrease of centrifugal force generated by the high-speed rotation of the blade, in conjunction with the telescopic spring, causes the moving block to drive the spring plate to move horizontally back and forth, and intermittently squeeze the protrusions on the blade, generating high-frequency micro-vibrations. These vibrations can be directly transmitted to the blade surface, effectively shaking off stubbornly adhered debris, dirt, etc., and improving the cleanliness of the blade.

[0017] 5. When the moving block reciprocates, the hydraulic oil in the extrusion rod, the second frame, the connecting pipe and the first frame drives the T-plate to move up and down, thereby driving the threaded ring to rotate and move up and down along the edge of the circular groove. The rotation of the threaded ring causes the first rib to generate centrifugal swing, automatically throwing off the fine fibers or debris wrapped around it. At the same time, the up and down movement of the rib and the shearing action are strengthened synchronously, further preventing blockage and ensuring that the fine cutting function is effective for a long time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a brush cutter with anti-tangling and blade self-cleaning functions proposed in this invention; Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure viewed from below; Figure 3 for Figure 1 A schematic diagram of the vertical sectional structure; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 for Figure 3 Enlarged structural diagram at point B; Figure 6 This is a top-view sectional three-dimensional structural diagram of the slider in a brush cutter with anti-tangling and blade self-cleaning functions proposed in this invention. Figure 7 for Figure 1 A schematic diagram of the structure after the body has been removed; Figure 8 for Figure 7 A schematic diagram of the three-dimensional structure viewed from below.

[0019] In the diagram: 1. Body; 2. Motor; 3. Blade; 4. Fixed ring; 5. Electric push rod; 6. Moving ring; 7. Circular groove; 8. Threaded ring; 9. First rib; 10. Second rib; 11. First rod; 12. First ring; 13. Second rod; 14. Crushing blade; 15. Speed ​​sensor; 16. Opening slot; 17. Rectangular rod; 18. Slider; 19. Scraper; 20. Third rod; 21. Strip cavity; 22. Moving block; 23. Telescopic spring; 24. Slide groove; 25. Slide plate; 26. Spring plate; 27. Protrusion; 28. First frame; 29. ​​Second ring; 30. T-shaped plate; 31. Second frame; 32. Extrusion rod; 33. Connecting pipe; 34. Third ring. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Reference Figures 1-8 A brush cutter with anti-tangling and blade self-cleaning functions includes a body 1, a motor 2 fixedly connected to the upper end of the body 1, a blade 3 fixedly connected to the output shaft of the motor 2 by bolts, and an anti-tangling mechanism on the blade 3. The anti-entanglement mechanism includes a fixed ring 4 fixedly connected to the upper end of the blade 3. Two electric push rods 5 are fixedly connected to the upper end of the body 1. The movable ends of the two electric push rods 5 are fixedly connected to a moving ring 6. The output shaft of the motor 2 passes through the inner sidewall of the fixed ring 4 and the moving ring 6. Multiple first rods 11 are rotatably connected to the upper end of the fixed ring 4. A first ring 12 is rotatably connected to the lower end of the moving ring 6. Multiple second rods 13, corresponding one-to-one with the multiple first rods 11, are rotatably connected to the lower end of the first ring 12. The sidewalls of the first rods 11 and their corresponding second rods 13 are rotatably connected. A crushing blade 14 is fixedly connected to the sidewalls of the multiple first rods 11 and the multiple second rods 13 away from the output shaft of the motor 2.

[0022] When motor 2 starts and drives blade 3 to rotate at high speed, fixed ring 4 rotates synchronously with blade 3, thereby driving first rod 11, second rod 13 and shredder 14 fixed thereon to rotate synchronously at high speed (due to the setting of first ring 12, moving ring 6 will not rotate at this time), so that shredder 14 has basic cutting and shredding capabilities, and can initially shred weeds and vines encountered during brush cutting, avoiding weeds and vines from getting tangled on the output shaft of motor 2, which would cause motor 2 to be under heavy load.

[0023] A speed sensor 15 is fixedly connected to the top of the body 1. The speed sensor 15 is electrically connected to two electric push rods 5 through an external control mechanism.

[0024] When the electric push rod 5 extends or retracts, it drives the moving ring 6 to move up and down along the output shaft of the motor 2. When the moving ring 6 moves down, it pushes the first ring 12 to move down synchronously, causing the first rod 11 and the corresponding second rod 13 to rotate relative to each other. This causes the first rod 11 and the second rod 13 to open away from the output shaft of the motor 2, driving the shredder 14 to unfold outward and expand the sweeping range of the shredder 14. When the electric push rod 5 retracts and drives the moving ring 6 to move up, the first ring 12 moves up synchronously, and the first rod 11 and the second rod 13 to close towards the output shaft of the motor 2. The shredder 14 is close to the main shaft, reducing the resistance to movement. Through the above-mentioned opening and closing adjustment, when weeds, vines and other debris wrap around the output shaft of the motor 2 and the main shaft of the blade 3, the unfolded shredder 14 can cut and shred the wrapped material in real time, preventing the wrapped material from accumulating and jamming the output shaft of the motor 2, and increasing the anti-tangling effect.

[0025] The control logic for adjusting the angle of the shredder 14 is based on the detection signal of the speed sensor 15. When there is too much tangled material during brush cutting, causing the rotation speed of the blade 3 and the shredder 14 to decrease, the speed sensor 15 detects the abnormal rotation speed in real time and transmits the detection signal to the external control mechanism. After receiving the signal, the control mechanism automatically controls the electric push rod 5 to extend and retract, adjusting the opening angle of the shredder 14 so that the shredder 14 is in the optimal shredding state and quickly shreds the tangled material. After the tangled material is cleared, the rotation speed of the blade 3 returns to normal, the speed sensor 15 detects the normal rotation speed signal, and the control mechanism controls the electric push rod 5 to reset, and the shredder 14 retracts, realizing the automatic adaptation and adjustment of the working state of the shredder 14, ensuring the stability and reliability of the anti-tangling function.

[0026] The upper end of the fixed ring 4 has a circular groove 7, and the inner wall of the circular groove 7 is threaded with a threaded ring 8. The upper end of the threaded ring 8 is fixedly connected with multiple first ribs 9, and the lower end of the movable ring 6 is fixedly connected with multiple second ribs 10. The angles of the multiple first ribs 9 and the multiple second ribs 10 are set opposite.

[0027] When the moving ring 6 moves up and down, the second rib 10 moves synchronously with the moving ring 6, forming an interlaced shearing action with the first rib 9 fixed on the threaded ring 8. The crushing blade 14 is mainly responsible for coarsely cutting and chopping longer weeds and vines, while the first rib 9 and the second rib 10 are responsible for further cutting the fine tangled filaments. The three work together to form an all-round anti-tangling crushing structure that provides coarse cutting, fine cutting, and no residue, further improving the anti-tangling effect.

[0028] The blade 3 is equipped with a cleaning mechanism, which includes two opening slots 16 on the side wall of the blade 3. Two rectangular rods 17 are fixedly connected to the inner wall of each of the two opening slots 16. The side walls of the two adjacent rectangular rods 17 are slidably connected to sliders 18. The side walls of the two sliders 18 away from the motor 2 are fixedly connected to scrapers 19. The lower ends of the two scrapers 19 are in contact with the upper end of the blade 3.

[0029] The side wall of the movable ring 6 is rotatably connected to the second ring 29, and the side wall of the second ring 29 is rotatably connected to the upper end of the slider 18 via the third rod 20.

[0030] When the moving ring 6 moves up and down along the output shaft of the motor 2, it drives the third rod 20 to move synchronously through the second ring 29. The third rod 20 pulls or pushes the slider 18 to slide back and forth along the rectangular rod 17, thereby driving the scraper 19 to move back and forth along the surface of the blade 3. This allows the scraper 19 to clean the upper surface of the blade 3, preventing local debris from remaining on the blade edge and surface, preventing the blade edge from being blocked or dulled by debris, ensuring that the blade 3 always remains sharp, ensuring smooth cutting during the cutting process, and avoiding incomplete cutting and reduced efficiency due to debris obstruction.

[0031] The slider 18 has a strip cavity 21 inside. The inner walls of both sides of the strip cavity 21 are provided with sliding grooves 24. The inner walls of the two sliding grooves 24 are sealed and slidably connected with sliding plates 25. The side walls of the two sliding plates 25 that are far apart from each other are fixedly connected with spring plates 26. The upper end of the blade 3 is fixedly connected with multiple protrusions 27 corresponding to the spring plates 26.

[0032] A movable block 22 is slidably connected to the inner wall of the strip cavity 21. The side wall of the movable block 22 is fixedly connected to the side wall of the two slide plates 25 respectively. The side wall of the movable block 22 near the motor 2 is elastically connected to the inner wall of the strip cavity 21 through multiple telescopic springs 23.

[0033] When blade 3 is weeding, it encounters significant resistance from the grass, and this resistance increases even more when it becomes entangled in weeds. However, after the shredder 14 pulverizes the entangled weeds, the resistance on blade 3 decreases. Consequently, the rotational speed of blade 3 fluctuates during operation, resulting in intermittent increases or decreases in centrifugal force at blade 3. Under the action of this centrifugal force and the elastic force of the telescopic spring 23, the moving block 22 drives two spring plates 26 to move horizontally back and forth via two sliding plates 25. At this time, the intermittent compression between the two spring plates 26 and the protrusion 27 generates high-frequency micro-vibrations on the spring plates 26. These high-frequency micro-vibrations directly act on blade 3, shaking off stubborn debris, dirt, and other impurities adhering to the surface of blade 3, preventing impurities from adhering tightly to the surface of blade 3, and improving the cleaning effect on blade 3.

[0034] Two first frames 28 are fixedly connected to the bottom of the circular groove 7. A third ring 34 is rotatably connected to the lower end of the threaded ring 8. T-shaped plates 30 are slidably connected to the inner walls of the two first frames 28. The upper ends of the two T-shaped plates 30 are fixedly connected to the lower end of the third ring 34.

[0035] Two second frames 31 are fixedly connected to the side walls of the two strip cavities 21 away from the telescopic spring 23. The two second frames 31 correspond one-to-one with the two first frames 28. The inner wall of the second frame 31 is sealed and slidably connected to the extrusion rod 32. The side wall of the extrusion rod 32 is fixedly connected to the side wall of the moving block 22. The inner wall of the second frame 31 is fixedly connected to the inner wall of its corresponding first frame 28 through the connecting pipe 33. Hydraulic oil is provided in both the first frame 28 and the second frame 31.

[0036] When the moving block 22 moves horizontally back and forth in the strip cavity 21, it will drive the extrusion rod 32 to slide synchronously in the second frame 31, thereby causing the hydraulic oil in the second frame 31 to flow intermittently in the corresponding first frame 28 through the connecting pipe 33. The intermittent flow of hydraulic oil will push the T-shaped plate 30 to move up and down in the first frame 28. The T-shaped plate 30 drives the threaded ring 8 to move up and down and rotate along the inner wall of the circular groove 7 through the third ring 34 (because the threaded ring 8 is threadedly connected to the circular groove 7, it will generate rotational motion when moving up and down). While the threaded ring 8 rotates, the multiple first ribs 9 at its upper end will generate centrifugal throwing action, throwing out weeds and debris wrapped around the first ribs 9, avoiding the first ribs 9 from being blocked by debris, and further strengthening the anti-winding effect; at the same time, the up and down movement and rotation of the threaded ring 8 can also drive the first ribs 9 and the second ribs 10 to perform more fully, improving the fine cutting effect.

[0037] It should be noted that the external thread of the threaded ring 8 and the internal thread of the circular groove 7 must be in clearance fit, with a clearance of 0.1-0.3mm (which can be finely adjusted according to the size of the equipment). This is to avoid the threaded ring from shifting or getting stuck due to excessive clearance, and to prevent excessive friction due to insufficient clearance, which would hinder the synchronous rotation and up-and-down movement.

[0038] It should be noted that the connecting tube 33 is located above the cutting surface of the blade 3, and the blade 3 will not affect the connecting tube 33 during the grass cutting process.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A brush cutter with anti-tangling and blade self-cleaning functions, comprising a body (1), wherein a motor (2) is fixedly connected to the upper end of the body (1), and a blade (3) is fixedly connected to the output shaft of the motor (2) by bolts, characterized in that: The blade (3) is provided with an anti-winding mechanism; The anti-entanglement mechanism includes a fixed ring (4) fixedly connected to the upper end of the blade (3). Two electric push rods (5) are fixedly connected to the upper end of the body (1). The movable ends of the two electric push rods (5) are fixedly connected to a moving ring (6). The output shaft of the motor (2) passes through the inner sidewall of the fixed ring (4) and the moving ring (6). The upper end of the fixed ring (4) is rotatably connected to a plurality of first rods (11). The lower end of the moving ring (6) is rotatably connected to a first ring (12). The lower end of the first ring (12) is rotatably connected to a plurality of second rods (13) corresponding to the plurality of first rods (11). The sidewalls of the first rods (11) and their corresponding second rods (13) are rotatably connected. The sidewalls of the plurality of first rods (11) and the plurality of second rods (13) away from the output shaft of the motor (2) are all fixedly connected to a crushing blade (14).

2. A brush cutter with anti-tangling and blade self-cleaning functions according to claim 1, characterized in that, The upper end of the fixed ring (4) is provided with a circular groove (7), and the inner wall of the circular groove (7) is threaded with a threaded ring (8). The upper end of the threaded ring (8) is fixedly connected with a plurality of first ribs (9), and the lower end of the movable ring (6) is fixedly connected with a plurality of second ribs (10). The angles of the plurality of first ribs (9) and the plurality of second ribs (10) are set opposite.

3. A brush cutter with anti-tangling and blade self-cleaning functions according to claim 1, characterized in that, A speed sensor (15) is fixedly connected to the top of the body (1), and the speed sensor (15) is electrically connected to two electric push rods (5) through an external control mechanism.

4. A brush cutter with anti-tangling and blade self-cleaning functions according to claim 2, characterized in that, The blade (3) is provided with a cleaning mechanism, which includes two opening slots (16) on the side wall of the blade (3). Two rectangular rods (17) are fixedly connected to the inner walls of the two opening slots (16). The side walls of the two adjacent rectangular rods (17) are slidably connected to sliders (18). The side walls of the two sliders (18) away from the motor (2) are fixedly connected to scrapers (19). The lower ends of the two scrapers (19) are in contact with the upper end of the blade (3).

5. A brush cutter with anti-tangling and blade self-cleaning functions according to claim 4, characterized in that, The side wall of the movable ring (6) is rotatably connected to a second ring (29), and the side wall of the second ring (29) is rotatably connected to the upper end of the slider (18) through a third rod (20).

6. A brush cutter with anti-tangling and blade self-cleaning functions according to claim 4, characterized in that, The slider (18) has a strip cavity (21) inside. The inner walls of both sides of the strip cavity (21) are provided with sliding grooves (24). The inner walls of the two sliding grooves (24) are sealed and slidably connected with sliding plates (25). The side walls of the two sliding plates (25) that are far apart from each other are fixedly connected with spring plates (26). The upper end of the blade (3) is fixedly connected with multiple protrusions (27) corresponding to the spring plates (26).

7. A brush cutter with anti-tangling and blade self-cleaning functions according to claim 6, characterized in that, The inner wall of the strip cavity (21) is slidably connected to a moving block (22). The side wall of the moving block (22) is fixedly connected to the side wall of the two slide plates (25). The side wall of the moving block (22) near the motor (2) is elastically connected to the inner wall of the strip cavity (21) through multiple telescopic springs (23).

8. A brush cutter with anti-tangling and blade self-cleaning functions according to claim 7, characterized in that, Two first frames (28) are fixedly connected to the bottom of the circular groove (7). A third ring (34) is rotatably connected to the lower end of the threaded ring (8). T-shaped plates (30) are slidably connected to the inner walls of the two first frames (28). The upper ends of the two T-shaped plates (30) are fixedly connected to the lower end of the third ring (34).

9. A brush cutter with anti-tangling and blade self-cleaning functions according to claim 8, characterized in that, The two strip cavities (21) are fixedly connected to the side walls away from the telescopic spring (23) with a second frame (31). The two second frames (31) correspond one-to-one with the two first frames (28). The inner wall of the second frame (31) is sealed and slidably connected with a pressing rod (32). The side wall of the pressing rod (32) is fixedly connected to the side wall of the moving block (22). The inner wall of the second frame (31) is fixedly connected to the inner wall of its corresponding first frame (28) through a connecting pipe (33). Hydraulic oil is provided in both the first frame (28) and the second frame (31).

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