Hydraulic obstacle-avoiding grass trimmer

Abstract

The invention 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, when a handrail is collided during cutting on a road, a hydraulic cylinder is rapidly responded and started according to mechanical linkage, and the cutter rotates reversely to avoid the handrail for continuous cutting; relatively passive obstacle avoidance can prevent the cutting knife and the handrails from being damaged, the speed of cutting work can be higher, and the grass mowing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of lawn mowers, in particular to a hydraulic obstacle avoidance lawn mower. Background Art

[0002] Highway shoulder maintenance is an important part of road maintenance, and its maintenance quality is directly related to the realization of highway traffic functions. The rampant growth of weeds on the shoulders may obstruct important traffic signs, which will not only affect the appearance of the road, but also pose a threat to driving safety. Therefore, it is necessary to regularly trim weeds and clear debris to ensure that the shoulders are clean and tidy. However, existing highway mowers have certain defects: 1. After the current highway automatic obstacle avoidance mowing equipment switches props after passing through pillars or obstacles, the tool lacks a stabilizing mechanism, making the cutting area incomplete. At the same time, this instability may increase the impact between the tool and the railing. 2. Existing mowing mechanisms often use passive obstacle avoidance. Even if there is a buffer mechanism, the speed of the machine's movement will be limited to prevent structural damage caused by large impacts, and the mowing speed is slow. Summary of the invention

[0003] The object of the present invention is to provide a hydraulic obstacle avoidance grass trimmer to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hydraulic obstacle avoidance grass trimmer, comprising a frame, a fixed shell connected to the frame by screws at the bottom, a rotary hydraulic cylinder fixedly installed inside the fixed shell, a hydraulic control valve installed above the rotary hydraulic cylinder by screws, an upper wire ring connected to the inside of the fixed shell, and an upper tool chassis suspended and connected to the bottom of the fixed shell by a load-bearing bearing, a lower wire ring connected to the top of the upper tool chassis, and the upper wire ring and the lower wire ring are connected to each other, a lower tool chassis is arranged below the upper tool chassis, a ratchet is installed below the lower tool chassis, and a plurality of support arms are arranged on the outside of the lower tool chassis , and each support arm of the lower tool chassis is provided with a protrusion with an arc-shaped cross-section, a vertical slide groove is provided on one side of the fixed shell, and a positioning slider that slides in contact with the slide groove is elastically connected in the slide groove through a positioning spring, a slide rail matching the positioning slider is provided on the lower tool chassis, and a number of motors and tools are installed on each support arm of the lower tool chassis, a collision rod is installed on each support arm of the lower tool chassis, and a gear fixed at the bottom end of the collision rod is meshed with a transmission gear installed under the lower tool chassis, the second row of gears of the transmission gear is meshed with a gear installed under the rotating slider, and the rotating slider is installed on each support arm of the lower tool chassis.

[0005] Preferably, a ratchet is fixedly mounted on the output shaft of the rotary hydraulic cylinder, and a pawl in contact with the ratchet is mounted on the bottom end of the lower tool chassis.

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

[0007] Preferably, the arc structure at the top end of the vertical starting rod is in contact with the arc structure of the transverse starting rod movably mounted on the fixed housing, and the transverse starting rod and the valve starting rocker arm are connected by a notch.

[0008] Preferably, the valve start swing rod is hinged on the fixed housing, and the valve start swing rod and the left switch of the hydraulic valve are connected by a notch.

[0009] Preferably: the left switch of the hydraulic valve moves horizontally in a slide groove opened 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, and one side of the valve starting rocker arm is elastically connected to one end of the fixed housing through a left switch spring.

[0010] Preferably: a sliding stop rod is movably mounted on the side surface of the fixed shell in the vertical direction, and the arc-shaped protrusion at the bottom end of the sliding stop rod and the arc-shaped protrusion at the top end of the lower tool chassis are located in the same vertical plane.

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

[0012] Preferably, the valve stop rocker arm and the right switch of the hydraulic valve are connected by a notch, and the right switch of the hydraulic valve slides in a horizontal direction in a slide 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 one side of the valve stop rocker arm is elastically connected to the fixed housing through the right switch spring.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The hydraulic obstacle avoidance lawn mower of the present invention can achieve stable cutting through the spring slider and the recessed slide groove after changing the blade, which ensures 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 respond quickly to the change in hydraulic oil pressure caused by the collision of the collision rod. The blade changing speed is relatively fast, and the one-way rotating mechanism used when changing the blade reduces the blade changing stroke compared to the reciprocating motion, which further increases the efficiency of rotating blade changing. The rapid response brought by active obstacle avoidance can prevent the occurrence of collision and allow the lawn mower to run at a faster speed, but the lawn mowing workload can be significantly increased in unit time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the hydraulic obstacle avoidance grass trimmer of the present invention;

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

[0018] Figure 3 This is a bottom view of the structure of the present invention;

[0019] Figure 4 It is a schematic diagram of the transmission structure of the present invention.

[0020] Explanation of symbols in the figure:

[0021] 1. Frame; 2. Fixed housing; 3. Hydraulic control valve; 4. Rotary hydraulic cylinder; 5. Upper tool chassis; 6. Lower tool chassis; 7. Load-bearing bearing; 8. Upper wire ring; 9. Lower wire ring; 10. Ratchet; 11. Ratchet; 12. Motor; 13. Blade; 14. Collision start lever; 15. Transmission gear; 16. Rotating slider; 17. Vertical start lever; 18. Horizontal start lever; 19. Valve start rocker; 20. Hydraulic valve left switch; 21. Left switch spring; 22. Sliding stop lever; 23. Valve stop rocker; 24. Hydraulic valve right switch; 25. Right switch spring; 26. Positioning slider; 27. Positioning spring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1 As shown, a hydraulic obstacle avoidance grass trimmer is suitable for highway internal measurement operations. The hydraulic obstacle avoidance grass trimmer includes a frame 1 for connecting a vehicle and connecting electricity and hydraulic oil circuits. A fixed shell 2 is fixedly installed on the lower part of the frame 1 by screws, and a rotary hydraulic cylinder 4 is installed in the middle of the fixed shell 2 by side screws, and a matching hydraulic control valve 3 is installed above the rotary hydraulic cylinder 4.

[0025] like Figure 2As shown, an upper tool chassis 5 is suspended inside the fixed housing 2 through a load-bearing bearing 7, and an upper wire ring 8 and a lower wire ring 9 are fixedly mounted on the fixed housing and the upper tool chassis 5, respectively. A lower tool chassis 6 is mounted below the upper tool chassis 5, and the lower tool chassis 6 has three arms, on which a plurality of motors 12 and blades 13 are mounted. The direction of electricity is the frame 1, the fixed housing 2, the upper wire ring 8, the lower wire ring 9, the upper tool chassis 5, the lower tool chassis 6, and then to the motor 12 to control the rotation of the blade 13, and only a certain area between the upper and lower wire rings is energized to ensure that only 1 to 2 of the three arms of the lower tool chassis 6 work at the same time to prevent waste of electricity.

[0026] like Figure 3 As shown, a ratchet 10 is installed on the bottom output shaft of the rotary hydraulic cylinder 4, and a plurality of corresponding ratchet pawls 11 are installed on the bottom of the lower prop chassis 6, which cooperate with each other to transmit the power of the rotary hydraulic cylinder 4 and allow the lower prop chassis 6 to perform unidirectional rotation.

[0027] like Figure 3 and Figure 4 As shown, a collision start rod 14, a transmission gear 15, and a rotating slider 16 are provided on each support arm of the fixed shell 2. The collision start rod 14 has a gear at the bottom, and the transmission gear 15 is arranged at the bottom of the lower tool chassis 6. It has a two-layer structure, which is a gear structure with different numbers of teeth. A small gear is connected to the lower gear of the collision start rod 14, and a large gear is connected to the small gear under the rotating slider 16. Above the rotating slider is a protrusion with an arc-shaped quarter circle, which can rotate at a certain position. When the collision rod 14 is rotated by the force, these geared structures can enlarge the rotation angle, so that the arc-shaped protrusion above the rotating slider 16 rotates more, which is beneficial to the transmission of mechanical displacement. At the same time, a rotation spring is provided at the connection between the collision start rod 14 and the lower tool chassis 6, which can return to the 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 shell 2, which can move up and down with the rotation of the rotating slider 16. A transverse starting rod 18 is installed on the fixed shell 2, which can move laterally with the up and down movement of the vertical starting rod 17. A valve starting swing rod 19 is hinged on the fixed shell 2 and is connected to the transverse starting rod 18 in a slot manner. It can swing with the transverse movement of the transverse starting rod 18. A transverse slide groove is provided on the rotary hydraulic cylinder 4, and a hydraulic valve left switch 20 is provided inside the slide groove, which is connected to the valve starting swing rod 19 in a slot manner. It can move laterally in the slide groove with the swing of the valve starting swing rod 19, thereby affecting the hydraulic control valve 3. A left switch spring 21 is provided between the valve starting swing rod 19 and the fixed shell 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 shell 2, and its lower part can move up and down when colliding with the arc-shaped protrusion on the lower tool chassis 6. A valve stop rocker 23 is hinged on the fixed shell 2 and can swing with the up and down movement of the sliding stop rod 22. A transverse slide groove is arranged on the rotary hydraulic cylinder 4, and a hydraulic valve right switch 24 is arranged inside the slide groove, which is connected to the valve stop rocker 23 in a slot manner and can move laterally in the slide groove with the swing of the valve stop rocker 23, thereby affecting the hydraulic control valve 3. A right switch spring 25 is arranged between the valve stop rocker 23 and the fixed shell 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 shell 2, and a positioning slider 26 is installed in the slide groove, which contacts the wavy protrusion on the lower tool chassis 6 at the bottom, and a positioning spring 27 is installed above the positioning slider 26. When the lower tool chassis 6 is not rotated to the standard position, the positioning slider 26 can be rotated to a suitable position and remain stable under the action of the positioning spring 27.

[0031] The working method of the hydraulic obstacle avoidance mower of the present invention is as follows: when the tractor drives the mower to work, when the collision start rod 14 touches the railing, it will drive the transmission gear 15 and the rotating slider 16 to rotate, touch the vertical start rod 17 on the housing to make it move up and down, and then make the lateral start rod 18 move horizontally, drive the valve start swing rod 19 to swing, and then make the hydraulic valve left switch 20 slide and touch the hydraulic control valve 3 to break the pressure balance of the rotary hydraulic cylinder 4, and quickly rotate, and the power drives the upper tool chassis 5 and the lower tool chassis 6 to rotate through the bottom ratchet 10 and the ratchet 11. When the collision start rod 14 is rotated to leave the railing, the rotation spring in the collision start rod 14 and the lower tool chassis 6 makes it return to the initial position, and the left switch spring 21 also makes the valve start swing rod 19 drive the hydraulic valve left switch 20 back to the initial position, and the two sides of the hydraulic control valve 3 are provided with magnetic suction, even if the hydraulic valve left switch 20 returns to the initial position, the rotary hydraulic cylinder 4 will continue to work and drive the rotation. When the lower tool chassis 6 rotates about 120 degrees, the protrusion on it will contact the sliding stop rod 22 on the fixed shell 2, causing it to move up and down, driving the valve stop rocker 23 to rotate, and then causing the hydraulic valve right switch 24 to move laterally to touch the hydraulic control valve 3 to cause the rotary hydraulic cylinder 4 to rotate in the opposite direction, and continue to move under the action of the magnetic attraction of the hydraulic control valve 3, but due to the action of the ratchet 10 and the pawl 11, the lower tool chassis 6 will not rotate accordingly. At this time, the lower tool chassis 6 has not reached the standard position, and the positioning slider 26 is near the middle of the wavy protrusion around the lower tool chassis 6. Under the action of the positioning spring 27, and combined with the ratchet 10 and the pawl 11, the lower tool chassis 6 is rotated 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 chassis 6 and fall, and at the same time, the right switch spring 25 will cause the valve stop rocker 23 to drive the hydraulic valve right switch 24 back to the initial position, and a cycle ends here.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

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

Claims

1. A hydraulic obstacle avoidance mower, comprising a frame (1), characterized in that: A fixed housing (2) is connected to the frame (1) below by screws, and a rotary hydraulic cylinder (4) is fixedly installed inside the fixed housing (2), and a hydraulic control valve (3) is installed above the rotary hydraulic cylinder (4) by screws. An upper wire ring (8) is connected inside the fixed housing (2), and an upper tool chassis (5) is suspended and connected to the bottom of the fixed housing (2) by a bearing bearing (7). A lower wire ring (9) is connected above the upper tool chassis (5), and the upper wire ring (8) and the lower wire ring (9) are connected to each other. A lower tool chassis (6) is arranged below the upper tool chassis (5), and a ratchet (11) is installed below the lower tool chassis (6). A plurality of support arms are arranged on the outer side of the lower tool chassis (6), and each support arm of the lower tool chassis (6) is provided with a cross-sectional The fixed shell (2) has an arc-shaped protrusion, a vertical slide groove is arranged on one side of the fixed shell (2), and a positioning slider (26) in sliding contact with the slide groove is elastically connected in the slide groove through a positioning spring (27), a slide rail matching with the positioning slider (26) is arranged on the lower tool chassis (6), and a plurality of motors (12) and cutters (13) are installed on each arm of the lower tool chassis (6), a collision rod (14) is installed on each arm of the lower tool chassis (6), and a gear fixedly sleeved on the bottom end of the collision rod (14) is meshed with a transmission gear (15) installed below the lower tool chassis (6), a second row of gears of the transmission gear (15) is meshed with a gear installed below the rotating slider (16), and the rotating slider (16) is installed on each arm of the lower tool chassis (6).

2. The hydraulic obstacle avoidance mower according to claim 1, characterized in that: A ratchet (10) is fixedly mounted on the output shaft of the rotary hydraulic cylinder (4), and a ratchet pawl (11) in contact with the ratchet (10) is mounted on the bottom end of the lower tool chassis (6).

3. The hydraulic obstacle avoidance mower according to claim 2, characterized in that: A vertical starting rod (17) is movably mounted on the side of the fixed housing (2) in the vertical direction, and an arc-shaped protrusion arranged at the bottom end of the vertical starting rod (17) contacts the arc-shaped protrusion at the top end of the rotating slider (16).

4. The hydraulic obstacle avoidance mower according to claim 3, characterized in that: The arc structure at the top end of the vertical actuating rod (17) contacts the arc structure of a transverse actuating rod (18) movably mounted on the fixed housing (2), and the transverse actuating rod (18) and the valve actuating rocker rod (19) are connected by means of a notch.

5. The hydraulic obstacle avoidance mower according to claim 4, characterized in that: The valve start swing rod (19) is hinged on the fixed housing (2), and the valve start swing rod (19) and the hydraulic valve left switch (20) are connected by a notch.

6. The hydraulic obstacle avoidance mower according to claim 5, characterized in that: The hydraulic valve left switch (20) moves in a horizontal direction in a slide groove provided on the rotary hydraulic cylinder (4), and one end of the hydraulic valve left switch (20) is fixedly connected to one end of the hydraulic control valve (3), and one side of the valve start rocker (19) is elastically connected to one end of the fixed housing (2) via a left switch spring (21).

7. The hydraulic obstacle avoidance mower according to claim 6, characterized in that: A sliding stop rod (22) is movably mounted on the side of the fixed housing (2) in the vertical direction, and the arc-shaped protrusion at the bottom end of the sliding stop rod (22) and the arc-shaped protrusion at the top end of the lower tool chassis (6) are located in the same vertical plane.

8. The hydraulic obstacle avoidance mower according to claim 7, characterized in that: The arc-shaped protrusion at the top end of the sliding stop rod (22) contacts the arc-shaped protrusion of the valve stop swing rod (23) movably mounted on the fixed housing (2), and the valve stop swing rod (23) is hinged on the fixed housing (2).

9. The hydraulic obstacle avoidance mower according to claim 8, characterized in that: The valve stop swing rod (23) and the hydraulic valve right switch (24) are connected by means of a notch, and the hydraulic valve right switch (24) slides in a horizontal direction in a slide groove on the rotary hydraulic cylinder (4).

10. The hydraulic obstacle avoidance mower according to claim 9, characterized in that: One end of the hydraulic valve right switch (24) is fixedly connected to one end of the hydraulic control valve (3), and one side of the valve stop rocker (24) is elastically connected to the fixed housing (2) via a right switch spring (25).

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