An electric lift system and electric lift control method for a riding lawn mower

Abstract

The application relates to an electric height adjustment system of a riding lawn mower, which comprises a vehicle frame and a cutter disc, and an electric height adjustment device is arranged between the vehicle frame and the cutter disc, the electric height adjustment device comprises a controller, a height adjustment gear plate, a height adjustment assembly, a lifting motor and a gear motor, the height adjustment assembly and the height adjustment gear plate are rotatably arranged on the vehicle frame, the height of the cutter disc is changed and fixed through cooperation of the height adjustment gear plate and the height adjustment assembly, the application has the following advantages: the height adjustment assembly is driven to rotate by the lifting motor, the cutter disc can be automatically lifted due to the fact that the height adjustment assembly is connected with the cutter disc, the operation difficulty and the manpower of an operator are effectively reduced, the adjustment precision is effectively improved by locking the height adjustment gear plate through a pin shaft, the lifting motor is not subjected to force during locking and is not prone to damage, and the application further provides an electric height adjustment control method of the riding lawn mower, which is used for controlling the electric height adjustment system of the riding lawn mower.

Description

An electric height adjustment system and electric height adjustment control method for a ride-on lawnmower Technical Field

[0001] This invention relates to the field of riding lawnmower technology, specifically to an electric height adjustment system for a riding lawnmower, as well as a riding lawnmower and an electric height adjustment control method. Background Technology

[0002] Ride-on lawnmowers are a type of lawn mowing machine suitable for mowing large areas of lawn. Compared to push-type lawnmowers, they have a larger cutting range, higher efficiency, and faster cutting speed. However, because the blades are larger and heavier, and the height adjustment function requires more manual operation, relying solely on manual operation is time-consuming and labor-intensive. Chinese patents CN111887001B and CN115956431A disclose an electric height adjustment system for a ride-on lawnmower, while CN211931380U and CN213694896U disclose a height adjustment mechanism for the chassis of a ride-on lawnmower. These patents reveal the use of a single electric push rod to adjust and lock the cutter head height. In contrast, existing patent US11006574B1 discloses a manual knob height adjustment device. Its disadvantages include: 1. Locking the cutter head height using only one electric push rod is unstable due to the weight of the cutter head, making it prone to shaking and damage during operation; 2. The cutter head height depends solely on the electric push rod, but the operation directly converts the translational motion of the electric push rod into the rotational motion of the height adjustment shaft, resulting in limited movement and low precision; 3. The cutter head is heavy and difficult to operate manually. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that existing cutter head height adjustment structures are prone to shaking during operation and can easily damage the electric push rod. This invention proposes an electric height adjustment system for a ride-on lawnmower. By cooperating with the height adjustment dial and the height adjustment component, the height of the cutter head can be changed and fixed. On the one hand, this effectively reduces the operator's difficulty and manpower. On the other hand, it does not cause damage to the lifting motor when locking, and greatly improves the service life.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: an electric height adjustment system for a ride-on lawnmower, comprising a frame and a cutter head, the cutter head being placed below the frame, and an electric height adjustment device for adjusting the height of the cutter head being provided between the frame and the cutter head. The electric height adjustment device includes a controller, a height adjustment dial, a height adjustment component, a lifting motor, and a gear motor. The height adjustment component and the height adjustment dial are rotatably mounted on the frame. The height adjustment component is connected to the cutter head. The lifting motor is mounted on the frame and is used to drive the height adjustment component to rotate. The gear motor is mounted on the frame and is used to drive the height adjustment dial to rotate. The height adjustment component has a pin that abuts against the height adjustment dial. The height of the cutter head is changed and fixed by the cooperation between the height adjustment dial and the pin of the height adjustment component. The lifting motor and the gear motor are both connected to the controller.

[0005] Preferably, the height adjustment mechanism includes a height adjustment shaft and a rotating arm. The height adjustment shaft is rotatably connected to the vehicle frame. The lifting motor is used to drive the height adjustment shaft to rotate. One end of the rotating arm is fixedly connected to the height adjustment shaft, and the other end of the rotating arm is connected to the cutter head. A pin protrudes from the middle of the rotating arm.

[0006] Preferably, the height adjustment mechanism includes two rotating arms, which are respectively connected to the two ends of the height adjustment shaft. The outer side of the other end of the two rotating arms is connected to the cutter head, and the pin protrudes and is connected to the inner side of one of the rotating arms.

[0007] Preferably, the height adjustment mechanism further includes a height adjustment link and a height adjustment rod, the adjustment link being connected to the cutter head, and the height adjustment rod being disposed between the rotating arm and the height adjustment link.

[0008] Preferably, a connecting rod assembly is provided between the lifting motor and the height adjustment shaft.

[0009] Preferably, the rotating arm is provided with a connecting shaft connected to the height adjustment rod, the cutter head is provided with a U-shaped seat, and the adjusting connecting rod is rotatably connected in the U-shaped seat.

[0010] Preferably, the frame is equipped with a limit switch. When the cutter head contacts the limit switch, the limit switch sends a working signal to the controller. After receiving the working signal, the controller sends a rotation signal to the gear motor.

[0011] Preferably, the bottom of the gear shifting plate is rotatably connected to the vehicle frame, and the top of the gear shifting plate is provided with multiple gear slots of different heights that cooperate with the pin shaft.

[0012] Preferably, the gear motor and the gear shifting dial are connected by a gear transmission assembly, which includes a driving gear and a driven gear. The driving gear is mounted on the gear motor, and the driven gear is mounted on the gear shifting dial.

[0013] In addition, the present invention also provides an electric height adjustment control method for a ride-on lawnmower, used to control the electric height adjustment system of the ride-on lawnmower described above. The electric height adjustment control method includes the following steps in sequence:

[0014] Step 1: Set the cutting gear signal through the controller and send a signal to the lifting motor. After receiving the signal, the lifting motor extends the piston rod and pushes the height adjustment component to rotate and lift the cutter head.

[0015] Step 2: When the cutter head comes into contact with the limit switch, the lifting motor stops working and locks. At the same time, the limit switch sends a working signal to the controller. After receiving the working signal, the controller sends a rotation signal to the gear motor. According to the signal set by the controller, the gear motor rotates the corresponding angle.

[0016] Step 3: After the gear motor completes the set rotation angle, the controller sends an action signal to the lifting motor. After receiving the signal, the lifting motor unlocks and drives the cutter head to descend. During the descent, the pin on the height adjustment component contacts the height adjustment plate, thereby limiting the descent of the cutter head. The lifting motor continues to move to the stroke locked by the controller and stops working.

[0017] In summary, the advantages of this invention are as follows: An electric height adjustment device for adjusting the cutter head height is provided between the frame and the cutter head. This device includes a controller, a height adjustment dial, a height adjustment component, a lifting motor, and a gear motor. The height of the cutter head is changed and fixed by the cooperation of the height adjustment dial and the height adjustment component. The lifting motor drives the height adjustment component to rotate. Since the height adjustment component is connected to the cutter head, automatic lifting of the cutter head is achieved, effectively reducing the operator's difficulty and manpower. Furthermore, the gear motor drives the height adjustment dial to rotate. Because the height adjustment component has a pin that abuts against the height adjustment dial, the locking mechanism between the pin and the dial effectively improves adjustment accuracy. Moreover, the lifting motor is not subjected to force during locking, making it less prone to damage and unaffected by other factors, ensuring reliable fixation. Secondly, the controller provides working signals to the lifting motor and the gear motor, and provides real-time feedback to the operator on the cutter head height and gear position, improving the convenience and comfort of adjustment. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 is a schematic diagram of the electric height adjustment system of a ride-on lawnmower according to the present invention;

[0020] Figure 2 is a top view of the electric height adjustment system of a riding lawnmower according to the present invention;

[0021] Figure 3 is a schematic diagram of the electric height adjustment device in this invention;

[0022] Figure 4 is a schematic diagram of the height adjustment shaft in this invention;

[0023] Figure 5 is a schematic diagram of the high-level adjustment disc in this invention;

[0024] Figure 6 is a structural block diagram of the controller connection in this invention.

[0025] Figure label:

[0026] 1. Frame, 11. Limit switch, 2. Cutter head, 21. U-shaped seat, 3. Electric height adjustment device, 31. Controller, 311. Power supply, 312. Gear shift dial switch, 313. Gear shift motor switch, 32. Gear shift dial, 321. Gear shift slot, 33. Height adjustment assembly, 330. Pin shaft, 331. Height adjustment shaft, 332. Height adjustment link, 333. Height adjustment rod, 334. Linkage assembly, 335. Rotating arm, 336. Connecting shaft, 34. Lifting motor, 35. Gear shift motor, 4. Gear transmission assembly, 41. Drive wheel, 42. Driven wheel, 5. Wiring harness. Detailed Implementation

[0027] Example 1

[0028] As shown in Figures 1, 2, 3, 4, 5, and 6, an electric height adjustment system for a ride-on lawnmower includes a frame 1 and a cutter head 2. The cutter head 2 is positioned below the frame 1. An electric height adjustment device 3 for adjusting the height of the cutter head is provided between the frame 1 and the cutter head 2. The electric height adjustment device includes a controller 31, a height adjustment dial 32, a height adjustment component 33, a lifting motor 34, and a gear motor 35. The height adjustment component 32 and the height adjustment dial 33 are rotatably mounted on the frame. The height adjustment component 32 is connected to the cutter head 2. The lifting motor 34 is mounted on the frame 1 and drives the height adjustment component 32 to rotate. The gear motor 34 is mounted on the frame and drives the height adjustment. The height adjustment component has a pin 330 that abuts against the height adjustment plate. The height of the cutter head is changed and fixed by the cooperation between the height adjustment plate and the pin of the height adjustment component. The lifting motor 34 and the gear motor 35 are both connected to the controller 31. The lifting motor and the gear motor are both connected to the controller through the wiring harness 5. In this embodiment, the controller can be a control and display component, that is, the controller also includes a display screen and input devices. Specifically, it is existing technology and will not be described in detail in this embodiment. The display screen can display the height of the corresponding cutter head or the corresponding gear in real time. The wiring harness can ensure the reliability of the connection between the lifting motor, the gear motor and the controller, and is not limited by the installation environment, making installation convenient.

[0029] In use, the controller changes the gear. When the lifting motor receives the signal, the piston rod extends and drives the height adjustment component to rotate, thereby disengaging the pin from the height adjustment plate. At this time, the controller sends a signal to the gear motor, which starts working and drives the height adjustment plate to rotate. When the selected gear is switched, the lifting motor receives the signal to retract, and the height adjustment component falls. The gear switching is completed when the pin comes into contact with the height adjustment plate.

[0030] An electric height adjustment device is installed between the frame and the cutter head to adjust the cutter head height. This device includes a controller, a height adjustment dial, a height adjustment component, a lifting motor, and a gear motor. The height of the cutter head is changed and fixed by the cooperation of the height adjustment dial and the height adjustment component. The lifting motor drives the height adjustment component to rotate. Since the height adjustment component is connected to the cutter head, it enables automatic lifting of the cutter head, effectively reducing the operator's workload and effort. Furthermore, the height adjustment dial is driven to rotate by the gear motor. Because the height adjustment component has a pin that abuts against the height adjustment dial, the locking mechanism effectively improves adjustment accuracy. Moreover, the lifting motor is not subjected to force during locking, making it less prone to damage and unaffected by other factors, ensuring reliable fixation. Finally, the controller provides working signals to the lifting motor and gear motor, and provides real-time feedback to the operator on the cutter head height and gear position, improving the convenience and comfort of adjustment.

[0031] The height adjustment mechanism 33 includes a height adjustment shaft 331 and a rotating arm 335. The height adjustment shaft is rotatably connected to the vehicle frame. The lifting motor drives the height adjustment shaft to rotate. One end of the rotating arm is fixedly connected to the height adjustment shaft, and the other end is connected to the cutter head. A pin protrudes from the middle of the rotating arm. In use, the lifting motor drives the height adjustment shaft to rotate, which in turn drives the rotating arm to rotate synchronously. Since the rotating arm is connected to the cutter head, the cutter head can be lifted under the action of the rotating arm. Placing the pin protruding from the middle of the rotating arm ensures good contact between the pin and the height adjustment plate. The height adjustment mechanism includes two rotating arms, which are respectively connected to both ends of the height adjustment shaft. The outer side of the other end of each rotating arm is connected to the cutter head, and a pin protrudes from the inner side of one of the rotating arms. The connection between the two rotating arms and the cutter head ensures the stability of the cutter head during lifting and reduces the wobbling of the cutter head. Placing the pin protruding from the inner side of one of the rotating arms allows for different installation positions of the pin according to the installation position of the height adjustment plate, meeting different installation requirements. In this embodiment, the lifting motor and the gear shift motor are preferably installed at both ends of the frame, so that they do not interfere with each other when they work, and the lifting motor and the gear shift motor can be installed independently, thus ensuring the stability of the entire frame.

[0032] The height adjustment mechanism also includes a height adjustment link 332 and a height adjustment rod 333. The adjustment link is connected to the cutter head, and the height adjustment rod is disposed between the rotating arm and the height adjustment link. In this embodiment, one end of the height adjustment link 332 is rotatably connected to the cutter head 2, and the other end of the adjustment link is rotatably connected to the frame 1. When the rotating arm rotates, the height adjustment rod drives the rotation of the height adjustment link, and the cutter head 2 can be adjusted up and down under the action of the height adjustment link, thereby realizing the height adjustment of the cutter head 2. The overall structure is compact and the adjustment is convenient.

[0033] A connecting rod assembly 334 is provided between the lifting motor 34 and the height adjustment shaft 331. In this embodiment, the connecting rod assembly 334 includes a first connecting rod and a second connecting rod. One end of the first connecting rod is rotatably connected to the piston rod of the lifting motor 34, and one end of the second connecting rod is rotatably connected to the other end of the first connecting rod. The other end of the second connecting rod is fixed to the height adjustment shaft 331. In use, the piston rod of the lifting motor 34 extends, driving the connecting rod assembly 334 to rotate, and then driving the height adjustment shaft 331 to rotate. The connecting rod assembly 334 can achieve the stability of the rotation of the height adjustment shaft 331. The rotating arm 335 is provided with a connecting shaft 336 connected to the height adjustment rod 333. The setting of the connecting shaft 336 is conducive to the installation of the height adjustment rod 333. In this embodiment, the top end of the height adjustment rod 333 is provided with a connecting ring connected to the connecting shaft 336. The cutter head 2 is provided with a U-shaped seat 21, and the adjusting rod is rotatably connected in the U-shaped seat 21. The U-shaped seat 21 can increase the contact area between the adjusting rod and the cutter head 2. In this embodiment, the adjusting rod is rotatably connected in the U-shaped seat 21 through a rotating shaft, thereby improving the lifting effect of the cutter head 2.

[0034] The bottom of the gear shifting plate 32 is rotatably connected to the frame. The top of the gear shifting plate 32 has multiple gear slots 321 with different heights that mate with the pins. By rotating the gear shifting plate, the vertical height of the cutter head 2 can be set by changing the gear slots of different heights that mate with the pins. The gear slots 321 can improve the fixing quality between the pins 330 and the gear shifting plate 32, ensuring the stability of the cutter head 2 during operation. The gear motor 35 is connected to the gear shifting plate via a gear transmission assembly 4. The gear transmission assembly 4 includes a driving wheel 41 and a driven wheel 42. The driving wheel 41 is mounted on the gear motor 35, and the driven wheel 42 is mounted on the gear shifting plate. The gear transmission assembly 4 can ensure the smooth rotation of the gear shifting plate. The structure of the gear transmission assembly 4 with the driving wheel 41 and the driven wheel 42 makes installation convenient.

[0035] The frame is equipped with a limit switch 11. When the cutter head contacts the limit switch, the limit switch sends a working signal to the controller. After receiving the working signal, the controller sends a rotation signal to the gear motor. The limit switch effectively controls the travel of the cutter head and can trigger the gear motor to rotate immediately, realizing automatic adjustment. In this embodiment, the controller 31 is also connected to a power supply 311, a gear turntable switch 312, and a gear motor switch 313, enabling independent control.

[0036] Example 2

[0037] This embodiment also discloses an electric height adjustment control method for a ride-on lawnmower, used to control the electric height adjustment system of the ride-on lawnmower described in Embodiment 1. The electric height adjustment control method includes the following steps in sequence:

[0038] Step 1: Set the cutting gear signal through the controller and send a signal to the lifting motor. After receiving the signal, the lifting motor extends the piston rod and pushes the height adjustment component to rotate and lift the cutter head.

[0039] Step 2: When the cutter head comes into contact with the limit switch, the lifting motor stops working and locks. At the same time, the limit switch sends a working signal to the controller. After receiving the working signal, the controller sends a rotation signal to the gear motor. According to the signal set by the controller, the gear motor rotates the corresponding angle.

[0040] Step 3: After the gear motor completes the set rotation angle, the controller sends an action signal to the lifting motor. After receiving the signal, the lifting motor unlocks and drives the cutter head to descend. During the descent, the pin on the height adjustment component contacts the height adjustment plate, thereby limiting the descent of the cutter head. The lifting motor continues to move to the stroke locked by the controller and stops working.

[0041] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. An electric height adjustment system for a ride-on lawnmower, comprising a frame and a cutter head, wherein the cutter head is positioned below the frame, characterized in that: An electric height adjustment device for adjusting the cutter head height is provided between the frame and the cutter head. The electric height adjustment device includes a controller, a height adjustment dial, a height adjustment component, a lifting motor, and a gear motor. Both the height adjustment component and the height adjustment dial are rotatably mounted on the frame. The height adjustment component is connected to the cutter head. The lifting motor is mounted on the frame and drives the height adjustment component to rotate. The gear motor is mounted on the frame and drives the height adjustment dial to rotate. The height adjustment component has a pin that abuts against the height adjustment dial. The height of the cutter head is changed and fixed by the cooperation between the height adjustment dial and the pin of the height adjustment component. The lifting motors are all connected to the controller. The height adjustment assembly includes a height adjustment shaft and a rotating arm. The height adjustment shaft is rotatably connected to the frame. The lifting motor is used to drive the height adjustment shaft to rotate. One end of the rotating arm is fixedly connected to the height adjustment shaft, and the other end of the rotating arm is connected to the cutter head. A pin protrudes from the middle of the rotating arm. The height adjustment assembly also includes a height adjustment link and a height adjustment rod. The height adjustment link is connected to the cutter head, and the height adjustment rod is located between the rotating arm and the height adjustment link. The bottom of the height adjustment plate is rotatably connected to the frame, and the top of the height adjustment plate is provided with multiple gear slots with different heights that cooperate with the pin.

2. The electric height adjustment system for a ride-on lawnmower according to claim 1, characterized in that: The height adjustment assembly includes two rotating arms, which are respectively connected to the two ends of the height adjustment shaft. The outer side of the other end of the two rotating arms is connected to the cutter head, and the pin protrudes and is connected to the inner side of one of the rotating arms.

3. The electric height adjustment system for a ride-on lawnmower according to claim 1, characterized in that: A connecting rod assembly is provided between the lifting motor and the height adjustment shaft.

4. The electric height adjustment system for a ride-on lawnmower according to claim 1, characterized in that: The rotating arm is provided with a connecting shaft connected to the height adjustment rod, the cutter head is provided with a U-shaped seat, and the height adjustment linkage is rotatably connected in the U-shaped seat.

5. The electric height adjustment system for a ride-on lawnmower according to claim 1, characterized in that: The frame is equipped with a limit switch. When the cutter head contacts the limit switch, the limit switch sends a working signal to the controller. After receiving the working signal, the controller sends a rotation signal to the gear motor.

6. The electric height adjustment system for a ride-on lawnmower according to claim 1, characterized in that: The gear motor and the gear shifting dial are connected by a gear transmission assembly, which includes a driving gear and a driven gear. The driving gear is mounted on the gear motor, and the driven gear is mounted on the gear shifting dial.

7. A method for electrically adjusting the height of a ride-on lawnmower, characterized in that: An electric height adjustment system for controlling the ride-on lawnmower according to any one of claims 1-6, wherein the electric height adjustment control method comprises the following steps: The process includes the following steps: Step 1: The controller sets the signal for the cutting gear and sends a signal to the lifting motor. Upon receiving the signal, the lifting motor extends its piston rod, pushing the height adjustment component to rotate and lift the cutter head. Step 2: When the cutter head comes into contact with the limit switch, the lifting motor stops working and locks. Simultaneously, the limit switch sends a working signal to the controller. Upon receiving the working signal, the controller sends a rotation signal to the gear motor. According to the signal set by the controller, the gear motor rotates the corresponding angle. Step 3: After the gear motor completes the set rotation angle, the controller sends an action signal to the lifting motor. Upon receiving the signal, the lifting motor unlocks and drives the cutter head to descend. During the descent, the pin on the height adjustment component contacts the height adjustment plate, thus limiting the descent of the cutter head. The lifting motor continues to move to the stroke locked by the controller and stops working.

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