Height-adjustable lawn mower for gardens

Abstract

The application discloses a height-adjustable lawn mower for gardens and relates to the technical field of lawn mowers, which comprises a transmission shaft body, a handle assembly is assembled on the outer wall of the transmission shaft body through a fixing seat, the handle assembly comprises a left handle and a right handle, the left handle is configured as a handle for controlling the speed and start-stop of equipment, and the operation delicacy is improved by virtue of the small torque characteristics of the near shaft body; the right handle is configured as a handle for controlling the steering of equipment, and the steering is labor-saving by virtue of the large torque characteristics of the far shaft body, the left handle is based on the small torque characteristics of the near shaft body, the operation of driving the speed and start-stop is more delicate and accurate, the speed of the high grass area is prevented from being too fast to cause the grass stems to be excessively pressed down, the stable cutting with low energy consumption is realized in the fine grass area, and the probability of operation failure is greatly reduced; and the right handle is based on the large torque advantage of the far shaft body, the steering in the side-pulling operation is more labor-saving, even if the obstacles such as flowerpots and landscape stones are frequently bypassed, the operator does not need to exert too large holding force.

Description

Technical Field

[0001] This invention relates to the field of lawn mower technology, specifically to a height-adjustable lawn mower for gardens. Background Technology

[0002] This is a height-adjustable lawn mower for landscaping. It is mainly designed for professionals such as gardeners, as well as parks, golf courses, and other places that require the maintenance of large lawns. Workers can flexibly adjust the height according to their own operating habits or weeding needs. The rotating blades at the bottom are the core weeding components. When using the machine, workers hold the device and push the blades close to the lawn to efficiently complete the weeding work, greatly improving the efficiency of lawn maintenance.

[0003] However, the existing technology still has the following defects in practical use: 1. Compared with the existing garden weeding machine shaft adjustment structure, it continues the mechanical buckle design of traditional telescopic tools. It has not been optimized to take into account the continuous scenario of side-pulling weeding that requires horizontal pulling operation. It uses manual pulling and buckle fixing to achieve telescopic movement. Although the assembly process is simpler and can reduce production input, it does not realize that the change of shaft length will break the original torque balance.

[0004] For side-pull lawnmowers, stopping and manually adjusting the machine directly disrupts the rhythm of the lateral pulling operation. For example, when dealing with uneven lawns next to flower beds, it is necessary to frequently stop, pull the shaft, and restart the machine. This not only prolongs the operation time but also easily causes the lateral pulling trajectory to deviate due to the interruption of the rhythm, resulting in missed or repeated trimming. Furthermore, the insufficient precision of the snap-on adjustment makes it difficult for the shaft extension length to match the height requirements of the lateral pulling operation, resulting in poor lawn trimming flatness. The change in the center of gravity after the shaft extends or retracts will increase the shaking of the machine when the lateral pulling turns, requiring the operator to exert extra force to maintain balance, significantly increasing wrist and arm fatigue. Long-term use will also cause the connecting parts of the lateral pulling structure to loosen and wear due to continuous shaking, shortening the life of the machine.

[0005] 2. Compared to the handle structure of existing garden weeders, in order to adapt to the operating range of side-pull operation, the handle needs to be set on the upper part of the shaft, away from the cutting area. For side-pull operation, the vibration force generated by the high-speed rotation of the cutting parts will be transmitted along the rigid shaft to the far end of the handle. Due to the long transmission distance, the vibration will be amplified during the transmission process due to the resonance of the shaft structure. When the operator holds the handle, he can clearly feel the strong vibration. Prolonged side-pull operation can easily cause numbness in the hand and soreness in the arm muscles, which greatly reduces the comfort of operation. More importantly, continuous vibration will affect the accuracy of side-pull operation and the flatness of lawn mowing. At the same time, long-term vibration transmission will also aggravate the loosening and wear of the connection between the handle and the shaft, shortening the service life of the equipment.

[0006] Furthermore, the center of gravity of a side-pull weed cutter relies on the torque balance between the shaft length and the side-pull direction. Shaft adjustment (lengthening or shortening) will directly disrupt this balance: after adjustment, the center of gravity will either shift downwards towards the cutting area or upwards towards the handle area. The shift in the center of gravity will cause irregular vibrations of the equipment during side-pull operation. This vibration will be superimposed on the vibration force generated by the cutting parts. In addition, the long-distance rigid transmission between the handle and the cutting area makes the superimposed vibration force easier to be transmitted to the handle area, and the transmission intensity is significantly improved.

[0007] The imbalance of the center of gravity and the superposition of vibration after shaft adjustment will greatly increase the difficulty of side-pulling operation: the operator not only has to bear the original vibration transmitted by the cutting part, but also has to deal with the equipment shaking caused by the shift of the center of gravity. He needs to exert extra force to maintain the balance of the equipment, and may even be unable to hold the equipment continuously during the operation. The irregular shaking caused by the shift of the center of gravity will subject the shaft, handle and the connection parts of the cutting part to alternating impact forces, which will accelerate the wear and loosening of parts such as buckles and screws. In severe cases, there may be safety hazards such as the failure of locking after shaft adjustment and the falling off of the cutting part.

[0008] Therefore, in view of this, the present invention proposes a height-adjustable lawn mower for gardens to make up for and improve the shortcomings of the prior art. Summary of the Invention

[0009] To address the aforementioned technical problems, this invention provides a height-adjustable lawn mower for gardens, thereby resolving the technical issues raised in the background section.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a garden lawn mower with adjustable height, comprising a drive shaft, wherein a handle assembly is mounted on the outer wall of the drive shaft via a fixed seat, the handle assembly comprising a left handle and a right handle, wherein the left handle is configured as a handle for controlling the speed adjustment and start / stop of the device, and the small torque characteristics near the shaft body improve the delicacy of operation; the right handle is configured as a handle for controlling the steering of the device, and the large torque characteristics far from the shaft body achieve effortless steering.

[0011] Furthermore, the grip assembly also includes a left crank and a right crank, both of which are bent and fitted onto the outer wall of the drive shaft. One end of the left crank is fixedly connected to the drive shaft, and the other end extends horizontally away from the drive shaft and is integrally connected to the left handlebar. One end of the right crank is fixedly connected to the drive shaft, and the other end extends horizontally away from the drive shaft and is integrally connected to the right handlebar.

[0012] Furthermore, the position where the left handle is mounted via the left crank is closer to the drive shaft than the position where the right handle is mounted via the right crank, and both the left and right handles are rod-shaped structures adapted for hand grip, with corresponding anti-slip textures on their outer walls.

[0013] Furthermore, a drive component is mounted on the upper part of the fixed base, and a cutting component is mounted on the lower end of the transmission shaft. After the power is output by the drive component, it is transmitted to the cutting component through the transmission shaft, and the cutting component performs lawn weeding operations.

[0014] Furthermore, the outer wall of the transmission shaft is provided with an adjustment assembly, the adjustment assembly including a bearing block slidably connected to the outer wall of the transmission shaft, a nut collar is assembled inside the bearing block, and a threaded shaft is threadedly connected to the inner wall of the nut collar, the nut collar and the threaded shaft forming a ball screw structure.

[0015] Furthermore, a positioning frame is symmetrically fixedly connected to the outer wall of the bearing block, and a support shaft is fixedly connected to the lower surface of the positioning frame. The support shaft is fixedly connected to the outer wall of the moving end of the transmission shaft. The operator can control the bearing block to move along the transmission shaft by rotating the threaded shaft, and then drive the cutting part to move synchronously through the support shaft to change the working length of the transmission shaft.

[0016] Furthermore, a shock-absorbing component is provided on the outside of the transmission shaft, and the shock-absorbing component is located between the grip assembly and the adjustment assembly. The shock-absorbing component includes a left buckle, a right buckle, and at least two buffer shafts. One end of the two buffer shafts is respectively mounted on the outer wall of the left handle and the right handle through the left buckle and the right buckle, and the other end is fixedly connected to the outer wall of the bearing block in the adjustment assembly.

[0017] Furthermore, both buffer shafts are arranged at an angle. The transmission shaft, buffer shaft, and corresponding left and right cranks together form a three-dimensional triangular support frame. The horizontal distance between the left handle and the load-bearing block is smaller than the horizontal distance between the right handle and the load-bearing block. The tilt angle of the buffer shaft on the left handle side is greater than the tilt angle of the buffer shaft on the right handle side.

[0018] Furthermore, each of the buffer shafts is equipped with a flexible hose, and threaded ribs are installed on the outer wall of the buffer shaft at positions corresponding to the flexible hoses. The buffer shaft can be stretched or compressed synchronously with the displacement of the bearing block, thereby adjusting the overall height of the equipment.

[0019] Furthermore, each of the outer walls of the buffer shafts, which are close to each other, is fixedly connected to a counterweight seat, and the counterweight seat can be moved away from or close to the transmission shaft according to the stretching or compression adaptability of the buffer shaft.

[0020] Compared with the prior art, the beneficial effects of the present invention are: (1) The perfect grip assembly of this device can effectively improve the adaptability and comfort of operation: the left handle relies on the small torque characteristics of the near-axis body to make the operation of drive speed adjustment and start-stop more delicate and precise. It can avoid the grass stems being overly crushed due to excessive speed adjustment in the high grass area, and can also achieve low-energy stable cutting in the fine grass area, greatly reducing the probability of operation error; while the right handle takes advantage of the large torque of the far-axis body to make the steering in the side pull operation more effortless. Even when frequently going around obstacles such as flower beds and landscape stones, the operator does not need to apply too much gripping force. With the anti-slip texture of the outer wall of the handle and the horizontal extension structure of the crank, it can not only disperse the gripping pressure and avoid hand slippage, but also make the overall working posture more balanced and stable, significantly reducing muscle fatigue caused by long-term operation.

[0021] (2) The structural design of the adjustment component enables efficient and stable adjustment of the shaft length: the operator can control the smooth movement of the bearing block by rotating the threaded shaft without stopping the machine, and drive the cutting part to adjust the height synchronously. This can not only adapt to the needs of lawn operations of different heights, but also ensure the consistency of the cutting height, avoiding the length deviation problem that occurs in traditional manual adjustment. At the same time, the synergistic effect of the bracket shaft and the positioning frame during the adjustment process can make the extension and retraction of the moving end of the transmission shaft more stable, prevent the cutting part from shifting or shaking, and allow the equipment to flexibly cope with lawn areas of mixed heights.

[0022] (3) During the adjustment of the shaft body, the elastic hose of the buffer shaft body can be stretched or compressed synchronously with the adjustment action. The elastic deformation of its rubber material can bear and resolve the instantaneous stress between the structures. When the bearing block drives the shaft body to extend and retract, the hard contact impact force that may occur between the components will be gradually absorbed by the flexible deformation of the elastic hose, avoiding problems such as loosening of the buckle and stripping of the screw due to frequent force on the connection part, so that the structural connection during the adjustment process remains tight and stable.

[0023] This synchronous linkage allows for a smoother operating trajectory of the adjustment components: the buffering effect of the flexible hose counteracts structural vibrations during adjustment, making the movement of the bearing block along the transmission shaft smoother and significantly reducing jamming or deviation. This not only helps the cutting parts to adjust their height more stably but also reduces the wear rate of components, allowing the core structures of the adjustment components, such as the ball screw and bearing block, to maintain smooth transmission performance over a long period of time, truly achieving "light operation, stable operation, and long life" in the adjustment process.

[0024] It is worth noting that the shock absorption assembly, through the differentiated tilt angles of the left and right buffer shafts and the three-dimensional triangular support formed by the drive shaft, can continuously enhance the structural stability of the equipment: the layout of the left handle side buffer shaft with a smaller tilt angle and the right handle side with a larger tilt angle makes the support force of the triangular frame more in line with the force direction of side-pulling operations. When the operator pulls the equipment laterally, the pulling force generated by the operation is evenly distributed to the drive shaft and handle assembly by the triangular structure, avoiding loosening or deformation of the local structure due to concentrated force. This allows the equipment to maintain a tight structural connection during long-term side-pulling operations. At the same time, this three-dimensional triangular support can also effectively reduce the vibration transmission generated by the operation of the cutting parts: the vibration is gradually attenuated in the triangular structure due to multi-directional support and will not be directly transmitted to the handle area, making the operator's grip more stable. This reduces the fatigue of hand numbness and arm soreness, and also avoids grip operation errors caused by vibration, ensuring the smoothness and safety of weeding operations.

[0025] The spiral threaded ribs on the outer wall of the buffer shaft enhance the torsional stiffness of the shaft and can counteract the torsional force generated by the change of tilt angle during shaft adjustment. When the transmission shaft extends or retracts, causing the buffer shaft to stretch, compress, or change its tilt angle, the threaded ribs act as a "reinforcing skeleton" of the shaft, greatly improving the structural stability of the buffer shaft, preventing irreversible torsional damage caused by repeated stress, and ensuring the long-term extension and retraction flexibility and support reliability of the buffer shaft.

[0026] (4) In actual use, the counterweight can be adapted and moved synchronously with the stretching and compression of the buffer shaft. When the transmission shaft extends and the cutting part moves down, causing the center of gravity to shift towards the working end, the counterweight moves closer to the transmission shaft, reducing the weight ratio of the handle area and preventing the equipment from shaking due to "top-heavy" and allowing the operator to maintain balance without extra effort during side-pulling operations. When the transmission shaft retracts and the cutting part moves up, causing the center of gravity to shift towards the handle end, the counterweight moves away from the transmission shaft, increasing the weight ratio of the handle area and pulling the center of gravity back to the torque balance range, preventing the equipment from losing control due to "top-light" and "bottom-heavy". This dynamic adaptation allows the adjusted equipment to operate stably directly, avoiding forced adjustment of the grip posture due to the shift in the center of gravity. It also reduces the vibration superposition caused by the imbalance of the center of gravity, preventing the operator's hands and arms from becoming fatigued quickly due to continuous compensation of the center of gravity. At the same time, it can also avoid uneven force on the parts caused by the shift in the center of gravity, reduce the wear of the internal connection structure, and allow the equipment to maintain a long-term stable operating state after frequent adjustments. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the grip assembly of the present invention.

[0028] Figure 2 This is a three-dimensional structural diagram of the adjustment component of the present invention.

[0029] Figure 3 This is a three-dimensional structural diagram of the shock absorption component of the present invention.

[0030] Figure 4 This is a three-dimensional structural diagram of the present invention in use.

[0031] Figure 5 This is a frontal planar structural diagram of the shock-absorbing component of the present invention.

[0032] Figure 6 This is an exploded view of the adjustment component and transmission shaft of the present invention.

[0033] Figure 7 This is a schematic diagram of the three-dimensional structure of the buffer shaft of the present invention.

[0034] Figure 8 This is a schematic diagram of the planar structure showing the positional relationship between the adjustment component and the shock absorption component of the present invention.

[0035] Figure 9 This is a schematic diagram of the internal structure of the left and right buckles of the present invention.

[0036] Figure 10 This is a schematic diagram of the internal structure of the positioning frame of the present invention.

[0037] The following components are labeled in the diagram: 1. Drive shaft; 11. Fixed base; 12. Drive component; 13. Cutting component; 2. Grip assembly; 21. Left crank; 22. Left handle; 23. Right crank; 24. Right handle; 3. Adjustment assembly; 31. Bearing block; 32. Nut collar; 33. Threaded shaft; 34. Positioning frame; 35. Bracket shaft; 4. Shock absorption assembly; 41. Left retaining ring; 42. Right retaining ring; 43. Buffer shaft; 44. Elastic hose; 45. Threaded rib; 46. Counterweight base. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that the drive shaft 1 is responsible for power transmission and component support. It transmits the power of the drive component 12 to the cutting component 13 through its rigid rod-like structure, and also serves as the mounting carrier for components such as the fixed seat 11 and the grip assembly 2. The fixed seat 11 performs the component assembly and positioning function. It connects the upper area of ​​the drive shaft 1 through bolts or snap-fit ​​structures to achieve the fixed assembly of the drive component 12 and the drive shaft 1, and at the same time provides an installation reference for the grip assembly 2. The drive component 12 provides the working power output function. It connects its own power output shaft to the upper end of the drive shaft 1 to transmit power to the drive shaft 1, driving the cutting component 13 to rotate. The cutting component 13 performs the lawn cutting operation function. It receives the power transmitted by the drive shaft 1 and rotates at high speed through a fixed connection with the lower end of the drive shaft 1 to achieve the cutting of lawn stems.

[0040] The conventional parameters of the above structure, such as the length and diameter of the drive shaft 1, the mounting hole size of the fixed seat 11, the power parameters and mounting interface form of the drive component 12, and the number and size of the cutting edge of the cutting component 13, can all refer to the existing technology. Since the connection method and shape adaptability of these structures are all based on conventional design, they will not be described in detail here.

[0041] It should be noted that the left handlebar 22 is connected to the fixed seat 11 via the left crank 21. The fixed seat 11 is then assembled with the drive unit 12 in the upper region of the transmission shaft 1. The control buttons on the left handlebar 22 are arranged along the structural channel of the left crank 21 and the fixed seat 11 via built-in wires and are electrically connected to the control module inside the drive unit 12. When the operator operates the buttons on the left handlebar 22, the control signal is transmitted to the drive unit 12 through the wires, thereby adjusting the power output state of the drive unit 12, such as speed and start / stop, so as to realize the linkage control of the drive unit 12 by the left handlebar 22.

[0042] Example 1: Please refer to Figure 1 - Figure 3 As shown, a height-adjustable lawn mower for gardens includes a drive shaft 1. A handle assembly 2 is mounted on the outer wall of the drive shaft 1 via a fixed seat 11. The handle assembly 2 includes a left handle 22 and a right handle 24. The left handle 22 is configured as a handle for controlling the speed adjustment and start / stop of the device, and improves the delicacy of operation by utilizing the small torque characteristics near the shaft. The right handle 24 is configured as a handle for controlling the steering of the device, and achieves effortless steering by utilizing the large torque characteristics far from the shaft.

[0043] It should be noted that the grip assembly 2 also includes a left crank 21 and a right crank 23. Both the left crank 21 and the right crank 23 are bent and assembled on the outer wall of the drive shaft 1. One end of the left crank 21 is fixedly connected to the drive shaft 1, and the other end extends horizontally away from the drive shaft 1 and is integrally connected to the left handle 22. One end of the right crank 23 is fixedly connected to the drive shaft 1, and the other end extends horizontally away from the drive shaft 1 and is integrally connected to the right handle 24. The position where the left handle 22 is assembled via the left crank 21 is closer to the drive shaft 1 than the position where the right handle 24 is assembled via the right crank 23. Both the left handle 22 and the right handle 24 are rod-shaped structures adapted to hand grip, and their outer walls are provided with anti-slip textures.

[0044] It should be noted that the drive unit 12 is mounted on the upper part of the fixed base 11, and the cutting unit 13 is mounted on the lower end of the transmission shaft 1. After the power is output by the drive unit 12, it is transmitted to the cutting unit 13 through the transmission shaft 1, and the cutting unit 13 performs the lawn weeding operation.

[0045] Please refer to Figure 2 - Figure 6 As shown, the outer wall of the transmission shaft 1 is provided with an adjustment component 3. The adjustment component 3 includes a bearing block 31 that is slidably connected to the outer wall of the transmission shaft 1. A nut collar 32 is assembled inside the bearing block 31. A threaded shaft 33 is threadedly connected to the inner wall of the nut collar 32. The nut collar 32 and the threaded shaft 33 form a ball screw structure.

[0046] It should be noted that a positioning frame 34 is symmetrically fixedly connected to the outer wall of the bearing block 31, and a support shaft 35 is fixedly connected to the lower surface of the positioning frame 34. The support shaft 35 is fixedly connected to the outer wall of the moving end of the transmission shaft 1. The operator can control the bearing block 31 to move along the transmission shaft 1 by rotating the threaded shaft 33, and then drive the cutting piece 13 to move synchronously through the support shaft 35 to change the working length of the transmission shaft 1.

[0047] Please refer to Figure 3 - Figure 10 As shown, a shock-absorbing component 4 is provided on the outside of the transmission shaft 1, and the shock-absorbing component 4 is located between the grip assembly 2 and the adjustment assembly 3. The shock-absorbing component 4 includes a left retaining ring 41, a right retaining ring 42, and at least two buffer shafts 43. One end of the two buffer shafts 43 is respectively mounted on the outer wall of the left handle 22 and the right handle 24 through the left retaining ring 41 and the right retaining ring 42, and the other end is fixedly connected to the outer wall of the bearing block 31 in the adjustment assembly 3.

[0048] It should be noted that both buffer shafts 43 are arranged at an angle. The transmission shaft 1, buffer shaft 43, and the corresponding left crank 21 and right crank 23 together form a three-dimensional triangular support frame. The horizontal distance between the left handle 22 and the bearing block 31 is smaller than the horizontal distance between the right handle 24 and the bearing block 31. The tilt angle of the buffer shaft 43 on the left handle 22 side is greater than the tilt angle of the buffer shaft 43 on the right handle 24 side. The shaft of each buffer shaft 43 is equipped with a flexible hose 44, and threaded ribs 45 are installed on the outer wall of the buffer shaft 43 at the positions corresponding to the flexible hose 44. The buffer shaft 43 can synchronously achieve a stretched or compressed state with the displacement change of the bearing block 31, thus completing the adjustment of the overall height of the equipment. The outer wall of each buffer shaft 43 at one end is fixedly connected to a counterweight 46, and the counterweight 46 can move away from or closer to the transmission shaft 1 according to the stretching or compression adaptability of the buffer shaft 43.

[0049] Specifically, the operator first starts the drive component 12, whose power output shaft transmits torque to the upper end of the transmission shaft 1. The transmission shaft 1, relying on its own rigid rod-like structure, stably transmits power to the lower cutting component 13, and the cutting component 13 rotates at high speed to enter the ready-to-work state.

[0050] At this time, the operator adopts a side-pulling working posture: both hands are respectively attached to the rod-shaped structure of the left handle 22 and the right handle 24, the palms are gripped with the anti-slip texture of the outer wall, the horizontal extension of the left crank 21 is used to maintain support, and the long extension of the right crank 23 is used to obtain operating space. The overall posture is balanced and supported by the connection between the grip assembly 2 and the drive shaft 1.

[0051] In subsequent operations, the left handle 22 utilizes its near-axis and low torque advantages to achieve drive control: when entering areas with dense tall grass, the speed adjustment trigger of the left handle 22 can be lightly pulled and gradually increased to increase the speed of the drive component 12, allowing the cutting component 13 to efficiently cut thick grass stems; when switching to areas with fine grass, the trigger can be slightly released to reduce the speed of the drive component 12, balancing flat cutting with low energy consumption; while the right handle 24 utilizes its far-axis and high torque to achieve effortless steering: the operator can lightly turn the right handle 24, causing the transmission shaft 1 to deflect slightly around obstacles using the left crank 21 as a fulcrum, and the left handle 22 can be held stably during steering without affecting the drive status. At the same time, the staggered rubber anti-slip texture on the outer wall of the handle can increase friction when the hand sweats due to vibration, and in conjunction with the horizontal extension structure of the crank and transmission shaft 1, the grip pressure is further distributed to ensure stable operation.

[0052] When the work area is switched from the tall grass area to the low grass area of ​​the flower bed, the operator does not need to stop the machine. He can directly hold the threaded shaft 33 of the adjustment component 3 with one hand and rotate it clockwise. Since the nut collar 32 and the threaded shaft 33 form a ball screw structure, the rotational motion is converted into the linear motion of the bearing block 31 along the transmission shaft 1. The bearing block 31 moves upward, and its outer wall positioning frame 34 drives the support shaft 35 to move upward in sync. The support shaft 35 is fixedly connected to the moving end of the transmission shaft 1, so that the moving end of the transmission shaft 1 retracts, and the cutting piece 13 rises synchronously with the lower end, corresponding to the cutting height of the low grass. When returning to the tall grass area, the threaded shaft 33 is rotated counterclockwise, the bearing block 31 moves downward, the moving end of the transmission shaft 1 extends, and the cutting piece 13 lowers synchronously.

[0053] Throughout the weeding process, the shock absorption assembly 4 operates in conjunction with the surroundings: the buffer shaft 43 on the left handle 22 side has a smaller horizontal spacing, resulting in a smaller tilt angle between it and the drive shaft 1; the buffer shaft 43 on the right handle 24 side has a larger horizontal spacing, resulting in a larger tilt angle between it and the drive shaft 1. Figure 5 As shown, the two components maintain a three-dimensional triangular support with the transmission shaft 1 to prevent the structure from becoming loose.

[0054] When the adjusting component 3 controls the adjustment of the transmission shaft 1, the elastic hose 44 of the buffer shaft 43 can be stretched or compressed simultaneously to absorb structural stress through rubber elastic deformation and prevent hard impact at the connection point; while the spiral threaded ribs 45 on the outer wall of the buffer shaft 43 can enhance the torsional stiffness of the shaft, counteract the torsional force generated by the change of tilt angle, and prevent the buffer shaft 43 from twisting.

[0055] During the adjustment of the shaft of the transmission shaft 1, the movement of the counterweight 46 is always adapted to the stretching and compression state of the buffer shaft 43: when the buffer shaft 43 is stretched by the pull of the bearing block 31, the counterweight 46 will move towards the transmission shaft 1 as the buffer shaft 43 stretches; while when the buffer shaft 43 is compressed by the movement of the bearing block 31, the counterweight 46 will move away from the transmission shaft 1 as the buffer shaft 43 contracts.

[0056] The core function of this adaptive movement is to dynamically balance the center of gravity of the equipment: when the drive shaft 1 extends, the cutting piece 13 moves downwards accordingly, and the center of gravity of the equipment needs to shift towards the working end. At this time, the buffer shaft 43 is in a stretched state, and the counterweight seat 46 is close to the drive shaft 1, which can reduce the weight ratio of the grip area and avoid the center of gravity being too high, causing the equipment to wobble in a "top-heavy" manner during operation. When the drive shaft 1 retracts, the cutting piece 13 moves upwards synchronously, and the center of gravity of the equipment will shift towards the grip end. At this time, the buffer shaft 43 is in a compressed state, and the counterweight seat 46 is away from the drive shaft 1, which can increase the weight ratio of the grip area, balance the torque balance range of the drive shaft 1 and the grip assembly 2, and ensure the overall stability of the equipment.

[0057] Meanwhile, the dynamic displacement of the counterweight 46 can also help weaken vibration transmission: its dynamic counterweight structure, formed by the movement of the buffer shaft 43, can effectively offset the amplitude of structural resonance after shaft adjustment. Combined with the three-dimensional triangular support frame formed by the transmission shaft 1, buffer shaft 43, left crank 21, and right crank 23, it further weakens the transmission effect of vibration to the grip area. This allows the operator to maintain a stable and comfortable working state without having to adjust the grip posture after adjusting the shaft height. This not only improves the continuity of weeding operations but also reduces muscle fatigue caused by holding the equipment for a long time.

[0058] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A height-adjustable lawn mower for gardens, comprising a drive shaft (1), characterized in that: The outer wall of the transmission shaft (1) is fitted with a grip assembly (2) via a fixed seat (11). The grip assembly (2) includes a left handle (22) and a right handle (24). The left handle (22) is configured as a handle for controlling the speed adjustment and start / stop of the equipment, and improves the delicacy of operation by utilizing the small torque characteristics of the near shaft. The right handle (24) is configured as a handle for controlling the steering of the equipment, and achieves effortless steering by utilizing the large torque characteristics of the far shaft. The outer wall of the transmission shaft (1) is provided with an adjustment component (3), the adjustment component (3) including a bearing block (31) slidably connected to the outer wall of the transmission shaft (1). The transmission shaft (1) is provided with a shock-absorbing component (4) on its outside, and the shock-absorbing component (4) is located between the grip assembly (2) and the adjustment assembly (3). The shock-absorbing component (4) includes a left buckle (41), a right buckle (42) and a buffer shaft (43) of no less than two. One end of the two buffer shafts (43) is respectively mounted on the outer wall of the left handle (22) and the right handle (24) through the left buckle (41) and the right buckle (42), and the other end is fixedly connected to the outer wall of the bearing block (31) in the adjustment assembly (3). Both buffer shafts (43) are arranged at an angle. The transmission shaft (1), buffer shaft (43), and the corresponding left crank (21) and right crank (23) together form a three-dimensional triangular support frame. The horizontal distance between the left handle (22) and the bearing block (31) is smaller than the horizontal distance between the right handle (24) and the bearing block (31). The tilt angle of the buffer shaft (43) on the left handle (22) side is greater than the tilt angle of the buffer shaft (43) on the right handle (24) side. The outer walls of the buffer shafts (43) at their respective ends are fixedly connected to counterweights (46), and the counterweights (46) can move away from or closer to the transmission shaft (1) according to the stretching or compression adaptability of the buffer shafts (43).

2. The adjustable-height lawn mower for gardens according to claim 1, characterized in that: The grip assembly (2) also includes a left crank (21) and a right crank (23). The left crank (21) and the right crank (23) are both bent and assembled on the outer wall of the drive shaft (1). One end of the left crank (21) is fixedly connected to the drive shaft (1), and the other end extends in a horizontal direction away from the drive shaft (1) and is integrally connected to the left handle (22). One end of the right crank (23) is fixedly connected to the drive shaft (1), and the other end extends in a horizontal direction away from the drive shaft (1) and is integrally connected to the right handle (24).

3. The adjustable-height lawn mower for gardens according to claim 1, characterized in that: The left handle (22) is mounted on the left crank (21) closer to the drive shaft (1) than the right handle (24) is mounted on the right crank (23). Both the left handle (22) and the right handle (24) are rod-shaped structures adapted to hand grip, and their outer walls are provided with anti-slip textures.

4. The adjustable-height lawn mower for gardens according to claim 1, characterized in that: A drive unit (12) is mounted on the top of the fixed base (11), and a cutter (13) is mounted on the lower end of the transmission shaft (1). After the power is output by the drive unit (12), it is transmitted to the cutter (13) through the transmission shaft (1), and the cutter (13) performs lawn weeding operation.

5. A height-adjustable lawn mower for gardens according to claim 1, characterized in that: The bearing block (31) is equipped with a nut collar (32) inside, and the inner wall of the nut collar (32) is threadedly connected to a threaded shaft (33). The nut collar (32) and the threaded shaft (33) form a ball screw structure.

6. A height-adjustable lawn mower for gardens according to claim 5, characterized in that: The outer wall of the bearing block (31) is symmetrically fixedly connected with a positioning frame (34), and the lower surface of the positioning frame (34) is fixedly connected with a support shaft (35). The support shaft (35) is fixedly connected to the outer wall of the moving end of the transmission shaft (1). The operator can control the bearing block (31) to move along the transmission shaft (1) by rotating the threaded shaft (33), and then drive the cutting piece (13) to move synchronously through the support shaft (35) to change the working length of the transmission shaft (1).

7. A height-adjustable lawn mower for gardens according to claim 1, characterized in that: The shaft of each buffer shaft (43) is equipped with a flexible hose (44), and threaded ribs (45) are installed on the outer wall of the buffer shaft (43) at the position corresponding to the flexible hose (44). The buffer shaft (43) can be stretched or compressed synchronously with the displacement change of the bearing block (31) to complete the adjustment of the overall height of the equipment.

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