Hydraulic obstacle-avoiding grass trimmer

Abstract

The utility model relates to the field of grass trimmers, and discloses a hydraulic obstacle-avoiding grass trimmer which comprises a rack, a fixed shell is connected to the lower portion of the rack, a rotary hydraulic cylinder is installed in the fixed shell, a hydraulic control valve is arranged above the rotary hydraulic cylinder, and a bearing cutting structure is connected to an output shaft below the rotary hydraulic cylinder. The obstacle avoidance mechanism is arranged on each cutting arm of the lower cutter chassis, so that when a handrail is collided during cutting on a road, a hydraulic cylinder is quickly responded and started according to mechanical linkage, and the collision of the handrail is avoided; the cutting tool rotates reversely to avoid the handrail to continue cutting, damage to the cutting tool and the handrail can be avoided relatively through passive obstacle avoidance, the cutting work speed can be higher, and the grass mowing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of lawn mowers, specifically a hydraulic obstacle avoidance lawn mower. Background Technology

[0002] Shoulder maintenance is a crucial aspect of road maintenance, and its quality directly impacts the functionality of highway traffic. Uncontrolled weed growth on shoulders can obscure important traffic signs, affecting not only the road's appearance but also potentially threatening driving safety. Therefore, regular weed trimming and debris removal to ensure clean and tidy shoulders are essential. However, existing highway mowers have certain shortcomings: 1. Current automatic obstacle avoidance mowers, after passing posts or changing obstacles, lack a stabilizing mechanism, resulting in incomplete cutting. This instability may also increase the impact between the blades and the guardrails. 2. Existing mower mechanisms often use passive obstacle avoidance; even with buffer mechanisms, the machine's speed is limited to prevent structural damage from large impacts, resulting in slower mowing speeds. Utility Model Content

[0003] The purpose of this invention is to provide a hydraulic obstacle avoidance grass cutter to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic obstacle-avoiding grass cutter, comprising a frame, a fixed housing connected to the bottom of the frame by screws, a rotary hydraulic cylinder fixedly installed inside the fixed housing, a hydraulic control valve mounted above the rotary hydraulic cylinder by screws, an upper guide ring connected inside the fixed housing, and an upper cutter base suspended from the bottom of the fixed housing by a bearing, a lower guide ring connected above the upper cutter base, the upper and lower guide rings being interconnected, a lower cutter base disposed below the upper cutter base, a pawl installed below the lower cutter base, and several supports on the outer side of the lower cutter base. The lower cutter base has an arm, and each arm of the lower cutter base is provided with a protrusion with an arc-shaped cross section. A vertical slide groove is provided on one side of the fixed housing, and a positioning slider that slides in contact with the slide groove is elastically connected in the slide groove by a positioning spring. The lower cutter base is provided with a slide rail that cooperates with the positioning slider. Several motors and cutters are installed on each arm of the lower cutter base. A collision rod is installed on each arm of the lower cutter base, and a gear fixed at the bottom of the collision rod meshes with a transmission gear installed below the lower cutter base. The second row of gears of the transmission gear meshes with a gear installed below the rotating slider, and the rotating slider is installed on each arm of the lower cutter base.

[0005] Preferably, the output shaft of the rotary hydraulic cylinder is fixedly mounted with a ratchet, and a pawl that contacts the ratchet is mounted at the bottom of the lower cutter chassis.

[0006] Preferably, a vertical starting rod is movably installed on the side of the fixed housing in the vertical direction, and the arc-shaped protrusion at the bottom of the vertical starting rod is in contact with the arc-shaped protrusion at the top of the rotating slider.

[0007] Preferably, the arc-shaped structure at the top of the vertical starting rod is in contact with the arc-shaped structure of the horizontal starting rod that is movably mounted on the fixed housing, and the horizontal starting rod and the valve starting lever are connected by a slot.

[0008] Preferably, the valve actuation lever is hinged to the fixed housing, and the valve actuation lever and the left switch of the hydraulic valve are connected by a slot.

[0009] Preferably, the left switch of the hydraulic valve moves horizontally within a groove on the rotary hydraulic cylinder, and one end of the left switch of the hydraulic valve is fixedly connected to one end of the hydraulic control valve. The valve start lever is elastically connected to one end of the fixed housing via a left switch spring.

[0010] Preferably, a sliding stop rod is movably installed on the side of the fixed housing in the vertical direction, and the arc-shaped protrusion at the bottom of the sliding stop rod and the arc-shaped protrusion at the top of the lower cutter chassis are located in the same vertical plane.

[0011] Preferably, the arc-shaped protrusion at the top of the sliding stop rod contacts the arc-shaped protrusion of the valve stop lever movably mounted on the fixed housing, and the valve stop lever is hinged to the fixed housing.

[0012] Preferably, the valve stop lever and the right switch of the hydraulic valve are connected by a slot, and the right switch of the hydraulic valve slides horizontally in a groove on the rotary hydraulic cylinder.

[0013] Preferably, one end of the right switch of the hydraulic valve is fixedly connected to one end of the hydraulic control valve, and the valve stop lever side is elastically connected to the fixed housing via the right switch spring.

[0014] Compared with the prior art, the advantages of this utility model are as follows:

[0015] This utility model of a hydraulic obstacle-avoiding grass cutter achieves stable cutting after blade replacement via a spring slider and recessed groove, ensuring the stability of the cutting area and the stable triggering of the obstacle avoidance mechanism. The rotating hydraulic cylinder in the obstacle avoidance mechanism can quickly respond to changes in hydraulic oil pressure caused by collisions with the collision rod, resulting in a fast blade replacement speed. Furthermore, the unidirectional rotating mechanism used during blade replacement reduces the blade replacement stroke compared to reciprocating motion, further increasing the efficiency of the rotating blade replacement. The rapid response of the active obstacle avoidance prevents collisions, allowing the grass cutter to operate at a higher speed, while significantly increasing the grass cutting workload per unit time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the hydraulic obstacle-avoiding grass cutter of this utility model;

[0017] Figure 2 This is a central sectional view of the present invention;

[0018] Figure 3 This is a bottom view of the structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the transmission structure of this utility model.

[0020] Explanation of symbols in the diagram:

[0021] 1. Frame; 2. Fixed housing; 3. Hydraulic control valve; 4. Rotary hydraulic cylinder; 5. Upper tool base; 6. Lower tool base; 7. Bearing; 8. Upper guide ring; 9. Lower guide ring; 10. Ratchet; 11. Pawl; 12. Motor; 13. Tool; 14. Collision start lever; 15. Transmission gear; 16. Rotary slider; 17. Vertical start lever; 18. Horizontal start lever; 19. Valve start lever; 20. Hydraulic valve left switch; 21. Left switch spring; 22. Sliding stop lever; 23. Valve stop lever; 24. Hydraulic valve right switch; 25. Right switch spring; 26. Positioning slider; 27. Positioning spring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0023] Example 1

[0024] like Figure 1 As shown, a hydraulic obstacle avoidance grass cutter is disclosed. This utility model of hydraulic obstacle avoidance grass cutter is suitable for roadside operations. The hydraulic obstacle avoidance grass cutter includes a frame 1 for connecting to a vehicle and connecting to the power and hydraulic oil circuits. A fixed housing 2 is fixedly installed on the lower part of the frame 1 by screws. A rotary hydraulic cylinder 4 is installed in the middle of the fixed housing 2 by screws on the side. A matching hydraulic control valve 3 is installed above the rotary hydraulic cylinder 4.

[0025] like Figure 2As shown, the upper tool base 5 is suspended inside the fixed housing 2 by a bearing 7. The upper guide ring 8 and the lower guide ring 9 are fixedly installed on the fixed housing and the upper tool base 5, respectively. The lower tool base 6 is installed below the upper tool base 5. The lower tool base 6 has three support arms, on which several motors 12 and tools 13 are installed. The power flow is from the frame 1, fixed housing 2, upper guide ring 8, lower guide ring 9, upper tool base 5, lower tool base 6, and then to the motors 12 to control the rotation of the tools 13. Only a certain area between the upper and lower guide rings is energized to ensure that only 1 to 2 of the three support arms of the lower tool base 6 work at the same time, thus preventing power waste.

[0026] like Figure 3 As shown, a ratchet 10 is installed on the bottom output shaft of the rotary hydraulic cylinder 4, and several corresponding pawls 11 are installed on the bottom of the lower prop chassis 6. The ratchet 10 and the lower prop chassis 6 can rotate in one direction by cooperating with each other to transmit the power of the rotary hydraulic cylinder 4.

[0027] like Figure 3 and Figure 4 As shown, each arm of the fixed housing 2 is equipped with a collision start rod 14, a transmission gear 15, and a rotating slider 16. The collision start rod 14 has a gear at its bottom. The transmission gear 15 is located at the bottom of the lower tool base 6 and has a two-layer structure, which consists of gear structures with different numbers of teeth. One small gear is connected to the lower gear of the collision start rod 14, and the other large gear is connected to the small gear below the rotating slider 16. The rotating slider has a quarter-circle protrusion with an arc shape above it, which can rotate at a certain position. When the collision rod 14 is subjected to force and rotates, these gear structures can amplify the rotation angle, allowing the arc protrusion above the rotating slider 16 to rotate more, which is beneficial for transmitting mechanical displacement. At the same time, a rotating spring is provided at the connection between the collision start rod 14 and the lower tool base 6, which can return it to its initial position when there is no external force.

[0028] like Figure 4 As shown, a vertical starting rod 17 is installed on the side of the fixed housing 2, which can move up and down with the rotation of the rotating slider 16. A horizontal starting rod 18 is installed on the top of the fixed housing 2, which can move horizontally with the vertical movement of the vertical starting rod 17. A valve starting rocker arm 19 is hinged on the top of the fixed housing 2 and connected to the horizontal starting rod 18 in a slotted manner. It can swing with the horizontal movement of the horizontal starting rod 18. A horizontal slide groove is provided on the rotary hydraulic cylinder 4. A hydraulic valve left switch 20 is provided inside the slide groove and connected to the valve starting rocker arm 19 in a slotted manner. It can move horizontally in the slide groove with the swing of the valve starting rocker arm 19, thereby affecting the hydraulic control valve 3. A left switch spring 21 is provided between the valve starting rocker arm 19 and the fixed housing 2, so that this series of transmission systems returns to the initial state after the collision.

[0029] like Figure 4 As shown, a sliding stop rod 22 is installed on the side of the fixed housing 2. When its lower part collides with the arc-shaped protrusion on the lower cutter base 6, it can move up and down. A valve stop rocker arm 23 is hinged on the fixed housing 2, which can swing as the sliding stop rod 22 moves up and down. A transverse slide groove is provided on the rotary hydraulic cylinder 4. A right switch 24 of the hydraulic valve is provided inside the slide groove and is connected to the valve stop rocker arm 23 in a slotted manner. It can move laterally in the slide groove as the valve stop rocker arm 23 swings, thereby affecting the hydraulic control valve 3. A right switch spring 25 is provided between the valve stop rocker arm 23 and the fixed housing 2, so that this series of transmission systems returns to the initial state after the collision.

[0030] like Figure 1 As shown, a vertical slide groove is installed on one side of the fixed housing 2, and a positioning slider 26 is installed in the slide groove. The slider 26 contacts the wave-shaped protrusion on the lower tool base 6 below. A positioning spring 27 is installed above the positioning slider 26. When the lower tool base 6 has not rotated to the standard position, the positioning slider 26 can be rotated to the appropriate position and kept stable under the action of the positioning spring 27.

[0031] The working method of this utility model hydraulic obstacle avoidance lawn mower is as follows: When the tractor drives the lawn mower, when the collision start lever 14 touches the barrier, it will drive the transmission gear 15 and the rotating slider 16 to rotate, touching the vertical start lever 17 on the housing, causing it to move up and down, which in turn causes the horizontal start lever 18 to move laterally, causing the valve start lever 19 to swing, which in turn causes the left switch 20 of the hydraulic valve to slide and touch the hydraulic control valve 3, breaking the pressure balance of the rotary hydraulic cylinder 4 and causing it to rotate rapidly. The power is transmitted through the bottom ratchet 10 and pawl 11 to drive the upper cutter chassis 5 and the lower cutter chassis 6 to rotate. When the rotation causes the collision start lever 14 to leave the barrier, the rotating spring in the collision start lever 14 and the lower cutter chassis 6 returns it to its initial position, and the left switch spring 21 also causes the valve start lever 19 to drive the left switch 20 of the hydraulic valve to return to its initial position. Since there are magnetic attraction on both sides of the hydraulic control valve 3, even if the left switch 20 of the hydraulic valve returns to its initial position, the rotary hydraulic cylinder 4 will continue to work and rotate. When the lower tool base 6 rotates approximately 120 degrees, its protrusions will contact the sliding stop rod 22 on the fixed housing 2, causing it to move up and down and drive the valve stop lever 23 to rotate. This, in turn, causes the right switch 24 of the hydraulic valve to move laterally and touch the hydraulic control valve 3, causing the rotary hydraulic cylinder 4 to rotate in the opposite direction. Under the magnetic attraction of the hydraulic control valve 3, it continues to move. However, due to the action of the ratchet 10 and pawl 11, the lower tool base 6 will not rotate accordingly. At this time, the lower tool base 6 has not reached the standard position. Meanwhile, the positioning slider 26 is located near the center of the wavy protrusion around the lower tool base 6. Under the action of the positioning spring 27, and in conjunction with the ratchet 10 and pawl 11, the lower tool base 6 rotates unidirectionally to the correct position. At this time, the curved surface below the sliding stop rod 22 will separate from the protrusion on the lower tool base 6 and fall. At the same time, the right switch spring 25 will cause the valve stop lever 23 to drive the right switch 24 of the hydraulic valve back to the initial position, thus ending one cycle.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic barrier-avoiding grass trimmer comprising a frame (1), characterized in that: a fixed shell (2) is connected to the lower part of the frame (1) by screws, a rotary hydraulic cylinder (4) is fixedly installed inside the fixed shell (2), a hydraulic control valve (3) is installed above the rotary hydraulic cylinder (4) by screws, an upper wire guide ring (8) is connected inside the fixed shell (2), an upper cutter chassis (5) is suspendedly connected to the bottom of the fixed shell (2) by a bearing (7), a lower wire guide ring (9) is connected above the upper cutter chassis (5), the upper wire guide ring (8) and the lower wire guide ring (9) are connected to each other, a lower cutter chassis (6) is arranged below the upper cutter chassis (5), a pawl (11) is installed below the lower cutter chassis (6), a plurality of supporting arms are arranged on the outer side of the lower cutter chassis (6), a protrusion with an arc-shaped cross section is arranged on each supporting arm of the lower cutter chassis (6), a vertical sliding groove is arranged on one side of the fixed shell (2), a positioning sliding block (26) in sliding contact with the sliding groove is elastically connected to the sliding groove by a positioning spring (27), a sliding rail matched with the positioning sliding block (26) is arranged on the lower cutter chassis (6), a plurality of motors (12) and cutters (13) are installed on each supporting arm of the lower cutter chassis (6), a collision rod (14) is installed on each supporting arm of the lower cutter chassis (6), a fixed gear sleeve at the bottom end of the collision rod (14) is in meshing engagement with a transmission gear (15) installed below the lower cutter chassis (6), a second row of gears of the transmission gear (15) is in meshing engagement with a gear installed below a rotary sliding block (16), and the rotary sliding block (16) is installed on each supporting arm of the lower cutter chassis (6). A ratchet wheel (10) is fixedly installed on the output shaft of the rotary hydraulic cylinder (4), and a pawl (11) is installed at the bottom end of the lower cutter chassis (6) and in contact with the ratchet wheel (10).

2. The hydraulic obstacle avoiding lawn mower according to claim 1, characterized in that: An arc-shaped protrusion arranged at the bottom end of a vertical starting rod (17) is in contact with an arc-shaped protrusion at the top end of the rotary sliding block (16), and the vertical starting rod (17) is movably installed on the fixed shell (2) along the vertical direction.

3. The hydraulic obstacle avoiding lawn mower according to claim 2, characterized in that: An arc-shaped structure at the top end of the vertical starting rod (17) is in contact with an arc-shaped structure of a horizontal starting rod (18) movably installed on the fixed shell (2), and the horizontal starting rod (18) and a valve starting swing rod (19) are connected by a slotting mode.

4. The hydraulic obstacle avoiding lawn mower according to claim 3, characterized in that: The valve starting swing rod (19) is hinged to the fixed shell (2), and the valve starting swing rod (19) and a hydraulic valve left switch (20) are connected by a slotting mode.

5. The hydraulic obstacle avoiding lawn mower according to claim 4, characterized in that: The hydraulic valve left switch (20) moves along the horizontal direction in a sliding groove formed in the rotary hydraulic cylinder (4), one end of the hydraulic valve left switch (20) is fixedly connected with one end of the hydraulic control valve (3), and one side of the valve starting swing rod (19) is elastically connected with one end of the fixed shell (2) by a left switch spring (21).

6. The hydraulic obstacle avoiding lawn mower according to claim 5, characterized in that: A sliding stop rod (22) is movably installed on the side of the fixed shell (2) along the vertical direction, and an arc-shaped protrusion at the bottom end of the sliding stop rod (22) and an arc-shaped protrusion at the top end of the lower cutter chassis (6) are located in the same vertical plane.

7. The hydraulic obstacle avoiding lawn mower according to claim 6, characterized in that: ​ 8. The hydraulic obstacle avoiding lawn mower according to claim 7, characterized in that: The arc-shaped protrusion on the top end of the sliding stop lever (22) is in contact with the arc-shaped protrusion of the valve stop swing lever (23) movably mounted on the fixed housing (2), and the valve stop swing lever (23) is hinged on the fixed housing (2).

9. The hydraulic obstacle avoiding lawn mower according to claim 8, characterized in that: The valve stop swing lever (23) and the hydraulic valve right switch (24) are connected by a slot, and the hydraulic valve right switch (24) slides in the horizontal direction in the sliding groove on the rotary hydraulic cylinder (4).

10. The hydraulic obstacle avoiding lawn mower according to claim 9, characterized in that: One end of the hydraulic valve right switch (24) is fixedly connected with one end of the hydraulic control valve (3), and one side of the valve stop swing lever (23) is elastically connected with the fixed housing (2) through the right switch spring (25).

Images