Lawn trimming height adjuster

Abstract

The utility model discloses a lawn trimming height adjuster, which belongs to the technical field of lawn trimming and comprises a mounting frame, telescopic rods are fixedly connected to two ends of one side of the mounting frame, a first electric push rod is fixedly connected to the middle of the side of the mounting frame, and a first connecting rod is fixedly connected to one ends, away from the mounting frame, of the telescopic rods and the first electric push rod. A hollow frame is fixedly connected to the other end of the first connecting rod, and a rotating disc is rotationally connected into the end, away from the first connecting rod, of the hollow frame; according to the lawn trimming height adjuster, the rotating speeds of driving motors of the two sets of cutting discs are adjusted respectively, and the height between the main cutting disc and the auxiliary cutting disc is adjusted independently in cooperation with a second electric push rod, so that the load and temperature rise of the auxiliary cutting disc are far lower than those of the main cutting disc; the positions of the two sets of cutting discs are alternated through the alternation motor, high and low load tasks are alternately borne, and the original main cutting disc enters a low-load state after being switched into the auxiliary disc.

Description

Technical Field

[0001] This utility model specifically relates to a lawn mowing height adjuster, belonging to the field of lawn mowing technology. Background Technology

[0002] A lawn mowing height adjuster is a device used to control the distance between the cutting disc of a lawnmower and the ground. It achieves precise adjustment through mechanical or electronic means to ensure that the lawn reaches the preset height requirement after mowing. This device usually serves as an intermediate component between the cutting disc and the vehicle body, fixing the cutting disc to the vehicle body and driving the cutting disc to move through a lifting mechanism.

[0003] Currently, lawn mowing height adjusters typically use a single cutting disc structure, with the height of the cutting disc adjusted mechanically or electronically. However, prolonged contact between the cutting disc and the lawn can lead to accelerated frictional heating, causing problems such as metal fatigue and blade dulling, requiring frequent shutdowns for adjustments. Although existing technologies have proposed improving heat dissipation by adjusting the cutting speed or blade tilt angle, the fundamental problem of continuous load on a single disc has not yet been solved.

[0004] In response, there is an urgent need for a device that can work collaboratively and intelligently switch between two cutting discs, while retaining the height adjustment function, to achieve load balancing and heat dissipation optimization. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a lawn mowing height adjuster to optimize the load distribution on the cutting disc.

[0006] This utility model discloses a lawn mowing height adjuster, comprising a mounting frame. Telescopic rods are fixedly connected to both ends of one side of the mounting frame, and a first electric actuator is fixedly connected to the middle of this side. A first connecting rod is fixedly connected to the ends of the telescopic rods and the first electric actuator away from the mounting frame, and a perforated frame is fixedly connected to the other end of the first connecting rod. A turntable is rotatably connected inside the end of the perforated frame away from the first connecting rod. A rotating motor for driving the turntable is installed inside the perforated frame. A second connecting rod is fixedly connected to the end of the rotating turntable away from the perforated frame. Supporting frames are fixedly connected to both ends of the second connecting rod, and a second electric actuator is fixedly connected to the other end of the supporting frames. A protective ring is fixedly connected to the moving end of the second electric actuator. A cutting disc is rotatably installed inside the protective ring, and a drive motor for driving the cutting disc is installed on the outer wall of the protective ring.

[0007] Furthermore, spring columns are symmetrically fixed to both sides of the outer wall of the protective ring, an arc-shaped ring is fixed to the moving end of the spring column, a pressure block is fixed to the middle of the arc-shaped ring near the protective ring, a pressure sensor is installed on the outer wall of the protective ring opposite to the pressure block, and an alarm is installed at the end of the first connecting rod near the telescopic rod.

[0008] Furthermore, a corrugated sleeve is slidably connected to one end of the second connecting rod near the receiving frame, and multiple sets of first cross screws are arranged around the other end of the corrugated sleeve. One end of the corrugated sleeve is fixed to the protective ring through multiple sets of first cross screws, and multiple sets of heat dissipation holes are opened around the end of the corrugated sleeve near the second connecting rod.

[0009] Furthermore, a sleeve is fixedly connected to the side of the mounting bracket away from the telescopic rod, and a sleeve rod is slidably connected to the other end of the sleeve. A cross screw is also threaded inside the end of the sleeve away from the mounting bracket, and the end of the cross screw inside the sleeve abuts against the surface of the sleeve rod. A first connecting bracket is fixedly connected to the end of the sleeve rod away from the sleeve.

[0010] Furthermore, a rotating rod is rotatably connected inside the first connecting frame, and a second connecting frame is fixedly connected to both ends of the rotating rod. A spray frame is installed at the end of the second connecting frame away from the first connecting frame, and an infusion pipe is connected in the middle of the spray frame, with a flange provided at the other end of the infusion pipe.

[0011] Furthermore, a worm gear is fixedly connected to one end of the rotating rod, and a worm gear that meshes with the worm gear is rotatably mounted on the first connecting frame.

[0012] Furthermore, a bundle frame is fixedly connected to one side of the outer wall of the sleeve, and the other end of the bundle frame is slidably connected to the infusion tube.

[0013] Beneficial effects:

[0014] By adjusting the speed of the drive motors of the two sets of cutting discs separately, and by adjusting the height between the main and auxiliary cutting discs individually with the second electric push rod, the load and temperature rise of the auxiliary cutting disc are made much lower than that of the main cutting disc. After the preset rotation time is reached, the position of the two sets of cutting discs is rotated by the rotation motor, taking turns to undertake high and low load tasks. After the original main cutting disc is switched to the auxiliary disc, it enters a low load state and reduces the temperature through natural heat dissipation, avoiding metal fatigue or drive motor burnout caused by continuous high temperature, reducing downtime for heat dissipation, and improving the smoothness of trimming work. The first electric push rod can drive the two sets of cutting discs to move towards the front of the vehicle, avoiding interference with the vehicle body components when the two sets of cutting discs rotate. After the rotation is completed, the first electric push rod can drive the auxiliary cutting disc to retract to the bottom of the vehicle body, reducing external space occupation and optimizing the spatial layout of the two sets of cutting discs.

[0015] The spring column buffer mechanism prevents the protective ring from being damaged by instantaneous overload. Combined with the mechanical guidance of the arc ring and the intelligent alarm of the pressure block, pressure sensor and alarm, a three-level protection mechanism for the cutting disc is achieved, realizing a balance between dynamic obstacle avoidance and rigid protection.

[0016] The maintenance solution can be delivered to the spray frame through the infusion tube, and then sprayed onto the mowed lawn through multiple nozzles of the spray frame. This achieves the effect of spraying and maintaining the lawn after mowing, working in conjunction with the mowing process, reducing the number of times the equipment has to go back and forth, improving work efficiency, and the position and angle of the spray frame can be adjusted to improve its applicability to different vehicle bodies. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the height adjuster of this utility model installed on the vehicle body;

[0018] Figure 2 This is a schematic diagram of the complete structure of the height adjuster of this utility model;

[0019] Figure 3 In this utility model Figure 2 A magnified structural diagram of a portion of point A;

[0020] Figure 4 This is a schematic diagram of the protective ring structure of this utility model;

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

[0022] In the diagram: 1. Mounting frame; 2. Telescopic rod; 3. First electric actuator; 4. First connecting rod; 5. Hollow frame; 6. Turntable; 7. Rotating motor; 8. Second connecting rod; 9. Support frame; 10. Second electric actuator; 11. Protective ring; 12. Drive motor; 13. Cutting disc; 14. Spring column; 15. Arc ring; 16. Pressure contact block; 17. Pressure sensor; 18. Corrugated sleeve; 19. Phillips head screw; 20. Heat dissipation hole; 21. Sleeve; 22. Sleeve rod; 23. First connecting frame; 24. Second connecting frame; 25. Rotating rod; 26. Worm gear; 27. Worm; 28. Sprayer frame; 29. ​​Infusion tube; 30. Bundle frame; 31. Alarm. Detailed Implementation

[0023] 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.

[0024] Please see Figures 1-5As shown, a lawn mowing height adjuster includes a mounting frame 1. Telescopic rods 2 are fixedly connected to both ends of one side of the mounting frame 1. The mounting frame 1 serves as the main frame of the device. Referring to Figure 1 in the specification, its end near the vehicle body can be welded to the vehicle body. A first electric actuator 3 is fixedly connected to the middle of this side of the mounting frame 1. The ends of the telescopic rods 2 and the first electric actuator 3 away from the mounting frame 1 are jointly fixedly connected to a first connecting rod 4. The two sets of first connecting rods 4 are used to jointly bear the force on the first electric actuator 3. Their moving ends can move together with the moving ends of the first electric actuator 3. Simultaneously, the stroke of the first electric actuator 3 should be 90% of the maximum extension of the telescopic rod 2 to prevent mechanical overload. A perforated frame 5 is fixedly connected to the other end of the first connecting rod 4. A turntable 6 is rotatably connected inside the end of the perforated frame 5 away from the first connecting rod 4. A rotating motor 7 is installed to drive the rotating disc 6. A second connecting rod 8 is fixedly connected to one end of the rotating disc 6 away from the hollow frame 5. The rotating disc 6 is used to reduce the drag force borne by directly driving the second connecting rod 8 to rotate through the output end of the rotating motor 7. A receiving frame 9 is fixedly connected to both ends of the second connecting rod 8, and a second electric push rod 10 is fixedly connected to the other end of the receiving frame 9. A protective ring 11 is fixedly connected to the moving end of the second electric push rod 10. A cutting disc 13 is rotatably installed inside the protective ring 11. A drive motor 12 that drives the cutting disc 13 to rotate is installed on the outer wall of the protective ring 11. The second electric push rod 10 is used to independently adjust the ground height of a single cutting disc 13 to compensate for lawn undulations or adjust the height difference between the main and auxiliary cutting discs 13. The protective ring 11 is used to reduce grass clippings flying. At the same time, a PLC control terminal is installed on this device.

[0025] During operation, the mounting bracket 1 is fixed to the body of the trimmer, with one end installed by welding or bolts according to the body. It is ensured that the telescopic rod 2 and the first electric push rod 3 are suspended vertically from the ground. The parameters of the PLC control terminal are adjusted, and the rotation cycle of the two sets of cutting discs 13 (main / auxiliary) is preset, such as 30 minutes for automatic rotation. The automatic control of the first electric push rod 3, the rotation motor 7, and the second electric push rod 10 and other actuators is coordinated to ensure that the moving end of the telescopic rod 2 extends into its fixed end, so that one set of cutting discs 13 extends into the bottom of the body, reducing the external space occupied by the cutting discs 13 and optimizing the spatial layout of the two sets of cutting discs 13.

[0026] During use, the height adjuster is moved across the lawn by the vehicle body. During this process, two sets of drive motors 12 are activated. Both sets of drive motors 12 are servo motors, causing the cutting disc 13 to rotate at high speed. The cutting disc 13 located at the front of the vehicle body is the main cutting disc 13. The speed of the drive motor 12 driving this main cutting disc 13 is controlled by the PLC to 3000 rpm, ensuring sufficient cutting energy to handle high-density lawns, such as hard grasses like krill and bermudagrass. The cutting disc 13 located at the bottom of the vehicle body is the auxiliary cutting disc 13. The speed of the drive motor 12 driving this auxiliary cutting disc 13 is controlled by the PLC. The speed is a low 2000rpm, reducing energy consumption and heat generation, focusing on fine trimming. The second electric push rod 10 pushes the protective ring 11 to move closer to or further away from the lawn, adjusting the distance between the cutting disc 13 and the lawn, and making the height difference between the main cutting disc 13 and the auxiliary cutting disc 13 0.5 cm, so that the auxiliary cutting disc 13 is slightly higher than the main cutting disc 13 in trimming height. During lawn trimming, the main cutting disc 13, located at the front of the vehicle, is responsible for the main trimming and cutting tasks, while the auxiliary cutting disc 13 is used to trim the grass tips left by the main cutting disc 13, avoiding missed or repeated cutting, and improving the quality of lawn trimming.

[0027] When the rotation time is reached, the PLC controls all motors to stop running and controls the moving end of the first electric push rod 3 to drive the two sets of cutting discs 13 to move continuously away from the rear of the vehicle body through the connecting parts such as the first connecting rod 4 and the second connecting rod 8. That is, the cutting disc 13 located at the bottom of the vehicle body is moved to the front of the vehicle body. By driving the output end of the rotation motor 7 to rotate 118 degrees, the second connecting rod 8 drives the two sets of cutting discs 13 to rotate in position, so that the original auxiliary cutting disc 13 turns into the front main cutting mode and the original main cutting disc 13 turns into the rear auxiliary mode. Then, the moving end of the first electric push rod 3 is controlled to reset, so that the auxiliary cutting disc 13 extends into the bottom of the vehicle body.

[0028] In summary, by adjusting the speed of the drive motors 12 of the two sets of cutting discs 13 separately, and by cooperating with the second electric push rod 10 to adjust the height between the main and auxiliary cutting discs 13 individually, the load and temperature rise of the auxiliary cutting disc 13 are made much lower than that of the main cutting disc 13. After the preset rotation time is reached, the position of the two sets of cutting discs 13 is rotated by the rotation motor 7, taking turns to undertake high and low load tasks. This allows the original main cutting disc 13 to enter a low load state after switching to the auxiliary disc, reducing the temperature through natural heat dissipation, avoiding metal fatigue or burnout of the drive motor 12 caused by continuous high temperature, reducing downtime for heat dissipation, improving the smoothness of the trimming work, and driving the two sets of cutting discs 13 towards the front of the vehicle by the first electric push rod 3, avoiding interference between the two sets of cutting discs 13 and the vehicle body components during rotation. After the rotation is completed, the auxiliary cutting disc 13 can be retracted to the bottom of the vehicle body by the first electric push rod 3, reducing external space occupation and optimizing the spatial layout of the two sets of cutting discs 13.

[0029] Please see Figures 1-4 As shown, spring columns 14 are symmetrically fixed to both sides of the outer wall of the protective ring 11. An arc-shaped ring 15 is fixed to the moving end of the spring column 14. A pressure block 16 is fixed to the middle of the arc-shaped ring 15 near the protective ring 11. A pressure sensor 17 is installed on the outer wall of the protective ring 11 opposite to the pressure block 16. An alarm 31 is installed on the end of the first connecting rod 4 near the telescopic rod 2.

[0030] During operation, the symmetrically arranged spring columns 14 absorb external impact forces through elastic deformation. The arc-shaped ring 15 connected to the moving end can convert radial pressure into axial displacement, preventing the protective ring 11 from being damaged due to instantaneous overload. The spring inside the spring column 14 is a tension spring. In the initial state, the moving end of the spring column 14 is located inside its fixed end. When the arc-shaped ring 15 encounters a movable hard object, such as a small stone, the protective ring 11 can push the small stone to move continuously and decompose the radial collision pressure into axial displacement and tangential sliding force, pushing the small stone to slide to both sides along the inclined surface, reducing interference to the cutting disc 13. When the arc-shaped ring 15 encounters a fixed or larger hard object, and the arc-shaped ring 15 is difficult to push to move, the arc-shaped ring 15 will be continuously compressed and displaced, causing the pressure contact block 16 to contact the pressure sensor 17, transmitting the signal to the alarm 31, triggering an audible and visual alarm, and alerting the operator.

[0031] In summary, the buffering mechanism of the spring column 14 prevents the protective ring 11 from being damaged by instantaneous overload. Combined with the mechanical guidance of the arc ring 15 and the intelligent alarm of the pressure block 16, pressure sensor 17 and alarm 31, a three-level protection mechanism for the cutting disc 13 is achieved, realizing a balance between dynamic obstacle avoidance and rigid protection.

[0032] Please see Figures 1-2 As shown, a corrugated sleeve 18 is slidably connected to one end of the second connecting rod 8 near the receiving frame 9, and multiple sets of first cross screws 19 are arranged around the other end of the corrugated sleeve 18. One end of the corrugated sleeve 18 is fixed to the protective ring 11 through multiple sets of first cross screws 19, and multiple sets of heat dissipation holes 20 are opened around the end of the corrugated sleeve 18 near the second connecting rod 8.

[0033] During operation, the corrugated sleeve 18 provides external protection for the drive motor 12 and the second electric actuator 10, reducing interference from external grass clippings. Its corrugated structure allows for axial expansion and contraction, preventing protection failure due to equipment vibration. The heat dissipation holes 20 are used to dissipate the heat generated by the drive motor 12, reducing heat accumulation inside the corrugated sleeve 18.

[0034] Please see Figures 1-5As shown, a sleeve 21 is fixedly connected to the side of the mounting bracket 1 away from the telescopic rod 2, and a sleeve rod 22 is slidably connected to the other end of the sleeve 21. A cross screw 19 is also threaded inside the end of the sleeve 21 away from the mounting bracket 1, and the end of the cross screw 19 inside the sleeve 21 abuts against the surface of the sleeve rod 22. A first connecting bracket 23 is fixedly connected to the end of the sleeve rod 22 away from the sleeve 21. A rotating rod 25 is rotatably connected inside the first connecting bracket 23. A second connecting bracket 24 is fixedly connected to both ends of the rotating rod 25. A spray frame 28 is installed at the end of the second connecting bracket 24 away from the first connecting bracket 23. An infusion tube 29 is connected to the middle of the spray frame 28, and a flange is provided at the other end of the infusion tube 29. A worm gear 26 is fixedly connected to one end of the rotating rod 25, and a worm 27 that meshes with the worm gear 26 is rotatably installed on the first connecting bracket 23. A bundle frame 30 is fixedly connected to one side of the outer wall of the sleeve 21, and the other end of the bundle frame 30 is slidably connected to the infusion tube 29.

[0035] During operation, the system connects the flange to the water tank on the vehicle body via a water pipe. Depending on the vehicle length, loosening the Phillips head screw 19 and pulling the lever 22 moves the sprayer 28 to the rear of the vehicle and locks it in place. Based on the rear frame of the vehicle body, rotating the worm gear 27 drives the worm wheel 26, causing the sprayer 28 to deflect around the axis of the rotating rod 25. This adjusts the angle of the sprayer 28, preventing the pesticide from spraying onto the rear of the vehicle or the operator. During use, the maintenance solution enters the sprayer 28 through the infusion pipe 29 and is sprayed onto the mowed lawn through multiple nozzles. This achieves the effect of spraying and maintaining the lawn after mowing, working in tandem with the mowing process, reducing the number of equipment trips, and improving operational efficiency.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lawn trim height adjuster comprising a mounting bracket (1) characterised in that: Said mounting frame (1) one side both ends are fixedly connected with telescopic rod (2), and the middle part of mounting frame (1) is fixedly connected with first electric push rod (3), the end of telescopic rod (2) and first electric push rod (3) away from mounting frame (1) is fixedly connected with first connecting rod (4), and the other end of first connecting rod (4) is fixedly connected with hollow frame (5), the inside of the end of hollow frame (5) away from first connecting rod (4) is rotatably connected with rotating disc (6), the inside of hollow frame (5) is provided with wheel change motor (7) for driving rotating disc (6) to rotate, the end of driving rotating disc (6) away from hollow frame (5) is fixedly connected with second connecting rod (8), the both ends of second connecting rod (8) are respectively fixedly connected with bearing frame (9), and the other end of bearing frame (9) is fixedly connected with second electric push rod (10), the moving end of second electric push rod (10) is fixedly connected with protective ring (11), the inside of protective ring (11) is rotatably installed with cutting disc (13), the outer wall of protective ring (11) is installed with drive motor (12) for driving cutting disc (13) to rotate.

2. A lawn trim height adjuster as claimed in claim 1 wherein: The outer wall of protective ring (11) is fixedly connected with spring column (14) on both sides, the moving end of spring column (14) is fixedly connected with arc ring (15), the side of arc ring (15) middle part close to protective ring (11) is fixedly connected with pressure contact block (16), the side of protective ring (11) outer wall opposite to pressure contact block (16) position is installed with pressure touch sensor (17), the end of first connecting rod (4) close to telescopic rod (2) is installed with alarm (31).

3. The lawn trimmer height adjuster of claim 1, wherein: The end of second connecting rod (8) close to bearing frame (9) is slidably connected with corrugated sleeve (18), and a plurality of first cross screws (19) are arranged around the other end of corrugated sleeve (18), one end of corrugated sleeve (18) is fixedly connected with protective ring (11) through a plurality of first cross screws (19), a plurality of heat dissipation holes (20) are arranged around the end of corrugated sleeve (18) close to second connecting rod (8).

4. The lawn trimmer height adjuster of claim 1, wherein: The side of mounting frame (1) away from telescopic rod (2) is fixedly connected with sleeve (21), and the other end of sleeve (21) is slidably connected with sleeve rod (22), the inside of the end of sleeve (21) away from mounting frame (1) is also threadedly connected with cross screw (19), and the end of cross screw (19) located in the inside of sleeve (21) abuts against the surface of sleeve rod (22), the end of sleeve rod (22) away from sleeve (21) is fixedly connected with first connecting frame (23).

5. A lawn trim height adjuster as claimed in claim 4 wherein: The inside of first connecting frame (23) is rotatably connected with rotating rod (25), the both ends of rotating rod (25) are fixedly connected with second connecting frame (24), the end of second connecting frame (24) away from first connecting frame (23) is installed with spraying frame (28), the middle part of spraying frame (28) is communicated with infusion tube (29), and the other end of infusion tube (29) is provided with flange plate.

6. A lawn trimmer height adjuster as claimed in claim 5 wherein: The end of rotating rod (25) is fixedly connected with worm wheel (26), and the end of first connecting frame (23) is rotatably installed with worm gear (27) engaged with worm wheel (26).

7. A lawn trimmer height adjuster as claimed in claim 6 wherein: The sleeve (21) is fixed with a harness (30) on one side of the outer wall, and the other end of the harness (30) is slidably connected with the infusion tube (29).

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