Lifting anti-locking structure of mower

Abstract

The lifting anti-locking structure comprises a machine base, a lifting driving mechanism, a transmission assembly, a guide rail assembly and a cutting knife assembly connecting base, a lifting through hole is formed in the machine base, and the lifting driving mechanism drives the cutting knife assembly connecting base to move up and down through the transmission assembly; the transmission gear is sleeved on the worm, the upper end of the transmission gear is provided with male ratchets, the lower part of the worm is provided with a tooth holder, the male ratchets of the transmission gear are matched with the female ratchets of the tooth holder, and the gear spring is matched with the transmission gear and provides elastic force towards the tooth holder for the transmission gear. And the lifting driving mechanism enables the cutting knife assembly connecting seat to move up and down at the lifting through hole along the guide rail assembly. The transmission gear is matched with the tooth holder of the worm through the male ratchet and the female ratchet, and is matched and pressed through the gear spring, so that the transmission gear cannot be clamped with the worm, and the mechanical loss of the transmission gear is reduced.

Description

Technical Field

[0001] The utility model relates to a lawn mower, in particular to a lifting anti-jamming structure of a lawn mower. Background Art

[0002] A lawn mower is a machine used to trim the height of a lawn. Since the lawn itself is uneven, the lawn mower will often jolt and vibrate during travel. Some lawn mowers are equipped with a lifting structure to adapt to the trimming needs of different lawn heights. However, with the jolting and vibration during the operation of the lawn mower, sometimes the lifting structure of the lawn mower will get jammed, so improvement is needed. Summary of the Invention

[0003] Aiming at the defects in the prior art that the jolting and vibration of the lawn mower during travel may cause the lifting structure to get jammed, etc., the utility model provides a new lifting anti-jamming structure for a lawn mower.

[0004] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0005] The lifting anti-jamming structure of a lawn mower includes a machine base, a control system, and a lifting drive mechanism, and further includes a fixed seat, a transmission component, a guide rail component, and a cutter assembly connecting seat. The fixed seat and the guide rail component are connected to the machine base. The lifting drive mechanism and the transmission component are respectively arranged on the fixed seat. A lifting through hole is arranged on the machine base. The cutter assembly connecting seat passes through the lifting through hole. The cutter assembly connecting seat is slidably connected to the guide rail component and cooperates with the transmission component. The lifting drive mechanism drives the cutter assembly connecting seat to move up and down at the lifting through hole through the transmission component. The lifting drive mechanism is electrically connected to the control system. The transmission component includes a worm and a transmission gear. A hollow shaft limiting space is arranged inside the worm. A central shaft is arranged on the fixed seat. The central shaft extends into the shaft limiting space of the worm. The lifting drive mechanism meshes with the transmission gear and drives the worm to rotate through the transmission gear. Engagement teeth are arranged on the cutter assembly connecting seat. The worm meshes with the engagement teeth of the cutter assembly connecting seat and drives the cutter assembly connecting seat to move up and down. A gear spring is further included. The transmission gear is sleeved on the worm. Male ratchet teeth are arranged at the upper end of the transmission gear. A tooth seat is arranged at the lower part of the worm. Female ratchet teeth are arranged at the lower end of the tooth seat. The male ratchet teeth of the transmission gear cooperate with the female ratchet teeth of the tooth seat. The gear spring cooperates with the transmission gear and provides an elastic force for the transmission gear towards the tooth seat.

[0006] Among them, the machine base is the load-bearing foundation of the entire structure, and the fixed seat is used to bear the lifting drive mechanism and the transmission component. The lifting drive mechanism is used to provide driving power, so that the power is transmitted to the connecting seat of the cutter assembly through the transmission component, and then the connecting seat of the cutter assembly can move up and down along the guide rail assembly at the lifting through hole. The transmission gear meshes with the lifting drive mechanism and can be driven by the lifting drive mechanism to rotate, thereby driving the worm to rotate. During the rotation of the worm, it can drive the engaging teeth to move up and down, and then drive the connecting seat of the cutter assembly to move up and down. The fixed seat positions the central shaft by extending the central shaft into the shaft limiting space of the worm, which can reduce the occupied space of the worm in the height direction and improve the utilization rate of the space.

[0007] Moreover, since the transmission gear is sleeved on the worm, and is matched with the tooth seat of the worm through the male ratchet teeth and the female ratchet teeth, and is cooperatively pressed by the gear spring, after the worm drives the connecting seat of the cutter assembly to the top or bottom, or when the lawn mower jolts, the transmission gear will not be stuck with the worm, but will continuously move up and down on the worm along the surfaces of the male ratchet teeth and the female ratchet teeth, thereby reducing its mechanical loss.

[0008] Preferably, for the lifting anti-sticking structure of the lawn mower described above, the connecting seat of the cutter assembly includes a seat body, a slider, and a joint plate. One side of the slider is connected to the seat body, and the other side of the slider is slidably connected to the guide rail assembly. One side of the joint plate is connected to the seat body, and the engaging teeth are arranged on the other side of the joint plate and mesh with the transmission component. The transmission component drives the joint plate to move up and down through the engaging teeth and drives the seat body to move synchronously.

[0009] The seat body is used to bear each component, and the slider can cooperate with the guide rail assembly to make the up and down movement of the seat body smoother. The joint plate is used to set the engaging teeth to cooperate with the transmission component to receive the power transmitted by the transmission component. Then, through the mutual cooperation among the seat body, the slider, and the joint plate, on the one hand, the up and down movement function of the connecting seat of the cutter assembly is realized, and on the other hand, the disassembly, installation, maintenance of the connecting seat of the cutter assembly are more convenient.

[0010] Preferably, for the lifting anti-sticking structure of the lawn mower described above, a U-shaped groove is provided at the upper end of the seat body. One side of the inner surface of the U-shaped groove is provided with a anti-detachment stop block, and a detachment space is formed by the cooperation of the other side of the inner surface of the U-shaped groove and the anti-detachment stop block. The upper end of the joint plate is provided with a joint convex block that cooperates with the U-shaped groove of the seat body. The joint convex block is semi-cylindrical, the diameter of the joint convex block is larger than the detachment space, and the radius of the joint convex block is smaller than the detachment space.

[0011] The U-shaped groove, anti-disengagement stopper, engagement convex block, and disengagement space cooperate with each other to achieve a hanging connection design between the engagement plate and the seat body. During normal use, the engagement convex block of the engagement plate can be blocked by the anti-disengagement stopper in the U-shaped groove and cannot exit the U-shaped groove, enabling the engagement plate to drive the seat body to move up and down normally when driven by the transmission component. When it is necessary to disassemble and assemble the engagement plate, the cooperation between the engagement convex block and the disengagement space can also quickly disengage or insert the engagement plate into the U-shaped groove, making the disassembly and assembly more convenient.

[0012] Preferably, the lifting anti-jamming structure of the lawn mower described above further includes a compression spring. One end of the compression spring cooperates with the seat body, and the other end of the compression spring cooperates with one side of the lower part of the engagement plate. A spring return space is formed between the seat body and the engagement plate. The engagement teeth are provided on the other side of the lower part of the engagement plate and correspond to the position of the compression spring. The compression spring provides an elastic force for the engagement teeth towards the transmission component.

[0013] The setting of the spring return space enables the engagement plate to have a margin of movement away from the transmission component. The cooperation between the compression spring and the engagement plate makes the engagement teeth of the engagement plate elastically engage with the transmission component. During the transmission process of the transmission component, if there is a possibility of jamming between the transmission component and the engagement teeth due to an unexpected situation, the engagement teeth can be pushed away from the transmission component to avoid jamming. During the continuous operation of the transmission component, the engagement teeth can re-engage with the transmission component through the spring return action of the compression spring, enabling the engagement teeth of the lawn mower to automatically prevent jamming and automatically return to position during operation, improving the stability during use.

[0014] Preferably, for the lifting anti-jamming structure of the lawn mower described above, the engagement plate includes an upper section plate, a middle section plate, and a lower section plate. The upper section plate and the lower section plate are vertically arranged, the middle section plate is horizontally arranged and is respectively connected to the lower end of the upper section plate and the upper end of the lower section plate. The engagement teeth are provided on the other surface of the lower part of the lower section plate, and the engagement convex block is provided at the upper end of the upper section plate.

[0015] Through the intermediate connection function of the middle section plate, the overall structural strength of the engagement plate can be enhanced, and the service life of the engagement plate can be improved.

[0016] Preferably, for the lifting anti-jamming structure of the lawn mower described above, a spring socket platform is provided on one side of the lower part of the lower section plate, and the other end of the compression spring is socketed with the spring socket platform.

[0017] The compression spring can be better fixed in position through the socketing with the spring socket platform, improving the stability during use.

[0018] Preferably, in the lifting anti-jamming structure of the lawn mower described above, the joint plate further includes a reinforcing plate, which is horizontally arranged and connected to the upper end of the upper section plate.

[0019] The reinforcing plate can further strengthen the structural strength at the joint bump and improve the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic structural diagram of the connecting seat of the cutter assembly of the present invention when it is in the lower position;

[0021] Figure 2 Cross-sectional view of the connecting seat of the cutter assembly of the present invention when it is in the lower position;

[0022] Figure 3 Cross-sectional view of the connecting seat of the cutter assembly of the present invention when it is in the upper position;

[0023] Figure 4 Schematic structural diagram of the connecting seat of the cutter assembly of the present invention when it is in the upper position;

[0024] Figure 5 Exploded view of the present invention;

[0025] Figure 6 Exploded view of the fixed seat, lifting drive mechanism and transmission component in the present invention;

[0026] Figure 7 Cross-sectional view of the fixed seat and transmission component in the present invention;

[0027] Figure 8 Partial cross-sectional view of the fixed seat, lifting drive mechanism and transmission component in the present invention;

[0028] Figure 9 Schematic structural diagram of the connecting seat of the cutter assembly in the present invention;

[0029] Figure 10 Exploded view of the connecting seat of the cutter assembly in the present invention;

[0030] Figure 11 Cross-sectional view of the connecting seat of the cutter assembly in the present invention;

[0031] Figure 12 Cross-sectional view of the fixed seat, transmission component and connecting seat of the cutter assembly in the present invention;

[0032] Figure 13 Exploded view of the fixed seat, lifting drive mechanism, transmission component and connecting seat of the cutter assembly in the present invention;

[0033] Figure 14Schematic diagram of the connection structure of the lifting drive mechanism and the control system in the present utility model. Detailed implementation manners

[0034] The following combines the attached Figure 1-14 drawings and detailed implementation manners to further describe the present utility model in detail, but they do not limit the present utility model:

[0035] The anti - jamming structure for lifting of a lawn mower includes a machine base 100, a control system 300, a lifting drive mechanism 500, and further includes a fixed seat 400, a transmission assembly 600, a guide rail assembly 700, and a cutter assembly connecting seat 800. The fixed seat 400 and the guide rail assembly 700 are connected to the machine base 100. The lifting drive mechanism 500 and the transmission assembly 600 are respectively arranged on the fixed seat 400. A lifting through - hole 110 is arranged on the machine base 100. The cutter assembly connecting seat 800 passes through the lifting through - hole 110. The cutter assembly connecting seat 800 is slidably connected to the guide rail assembly 700 and cooperates with the transmission assembly 600. The lifting drive mechanism 500 drives the cutter assembly connecting seat 800 to move up and down at the lifting through - hole 110 through the transmission assembly 600. The lifting drive mechanism 500 is electrically connected to the control system 300. The transmission assembly 600 includes a worm 610 and a transmission gear 620. A hollow shaft limiting space 611 is arranged inside the worm 610. A central shaft 410 is arranged on the fixed seat 400. The central shaft 410 extends into the shaft limiting space 611 of the worm 610. The lifting drive mechanism 500 meshes with the transmission gear 620 and drives the worm 610 to rotate through the transmission gear 620. Engagement teeth 831 are arranged on the cutter assembly connecting seat 800. The worm 610 meshes with the engagement teeth 831 of the cutter assembly connecting seat 800 and drives the cutter assembly connecting seat 800 to move up and down. It further includes a gear spring 630. The transmission gear 620 is sleeved on the worm 610. Male ratchet teeth 621 are arranged at the upper end of the transmission gear 620. A tooth seat 612 is arranged at the lower part of the worm 610. Female ratchet teeth 613 are arranged at the lower end of the tooth seat 612. The male ratchet teeth 621 of the transmission gear 620 cooperate with the female ratchet teeth 613 of the tooth seat 612. The gear spring 630 cooperates with the transmission gear 620 and provides an elastic force for the transmission gear 620 towards the tooth seat 612.

[0036] When height adjustment is required, the lifting drive mechanism 500 starts to operate, conducts power to the transmission assembly 600, and then conducts power to the cutter assembly connecting seat 800 through the transmission assembly 600, so that the cutter assembly connecting seat 800 moves up or down along the guide rail assembly 700 at the lifting through - hole 110.

[0037] The lifting drive mechanism 500 includes a lifting drive motor and a lifting drive gear. The lifting drive motor receives a control signal from the control system 300 to rotate forward or backward, thereby driving the lifting drive gear to rotate. When the lifting drive gear rotates, it drives the transmission gear 620 meshing with it to rotate. Then, the transmission gear 620 drives the worm 610 to rotate through the male ratchet teeth 621 and the female ratchet teeth 613. As the worm 610 rotates forward or backward, the engaging tooth 831 is driven to move upward or downward, so that the cutter assembly connecting seat 800 moves up and down along the guide rail assembly 700.

[0038] When the cutter assembly connecting seat 800 moves up or down to the position in place, if the lifting drive mechanism 500 does not stop driving due to an accident, when the cutter assembly connecting seat 800 can no longer move up or down, the worm 610 cannot be rotated at this time. Then, the transmission gear 620 will fluctuate up and down along the tooth surface of the female ratchet teeth 613 while rotating, so that the power is disconnected at the joint between the transmission gear 620 and the worm 610, avoiding the situation that the lifting drive mechanism 500 is stuck due to the transmission gear 620 being stuck, and improving the safety during use.

[0039] Preferably, the cutter assembly connecting seat 800 includes a seat body 810, a slider 820, and an engaging plate 830. One side of the slider 820 is connected to the seat body 810, and the other side of the slider 820 is slidably connected to the guide rail assembly 700. One side of the engaging plate 830 is connected to the seat body 810. The engaging tooth 831 is arranged on the other side of the engaging plate 830 and meshes with the transmission assembly 600. The transmission assembly 600 drives the engaging plate 830 to move up and down through the engaging tooth 831 and drives the seat body 810 to move synchronously.

[0040] Preferably, a U-shaped groove 811 is provided at the upper end of the seat body 810. A retaining block 812 is provided on one side of the inner surface of the U-shaped groove 811. An escape space 813 is formed by the cooperation of the other side of the inner surface of the U-shaped groove 811 and the retaining block 812. An engaging convex block 832 matching the U-shaped groove 811 of the seat body 810 is provided at the upper end of the engaging plate 830. The engaging convex block 832 is semi-cylindrical. The diameter of the engaging convex block 832 is greater than the escape space 813, and the radius of the engaging convex block 832 is less than the escape space 813.

[0041] When assembling the joint plate 830 onto the seat body 810, the joint plate 830 can be rotated to the horizontal position so that the joint bumps 832 on the joint plate 830 are aligned with the U-shaped groove 811 at the upper end of the seat body 810. At this time, the size in the width direction of the joint bump 832 is the radius size of the joint bump 832. Then, the joint bump 832 can smoothly enter into the U-shaped groove 811 from the escape space 813 of the U-shaped groove 811 at this position. After the entry is completed, then rotate the joint plate 830 to make the joint plate 830 rotate to the vertical position. At this time, the size in the width direction of the joint bump 832 is the diameter size of the joint bump 832. Then, the joint bump 832 will be blocked by the anti-escape stop block 812 of the U-shaped groove 811 and cannot escape, thus completing the assembly of the joint plate 830. Similarly, when it is necessary to remove the joint plate 830 from the seat body 810, just operate in the reverse direction, and the joint bump 832 of the joint plate 830 can be conveniently and quickly taken out from the U-shaped groove 811 on the seat body 810, making the maintenance and replacement more rapid.

[0042] When the joint tooth 831 is driven by the worm 610 to move upward, the joint tooth 831 drives the whole joint plate 830 to move upward. During the upward movement of the joint plate 830, the whole seat body 810 is driven to move upward by the way that the anti-escape stop block 812 is pushed upward by the joint bump 832 on the joint plate 830, so that the seat body 810 moves upward along the guide rail assembly 700 through the slider 820.

[0043] When the joint tooth 831 is driven by the worm 610 to move downward, the joint tooth 831 drives the whole joint plate 830 to move downward. During the downward movement of the joint plate 830, the whole seat body 810 is driven to move downward by the way that the U-shaped groove 811 is pressed downward by the joint bump 832 on the joint plate 830, so that the seat body 810 moves downward along the guide rail assembly 700 through the slider 820.

[0044] Preferably, it further includes a compression spring 840. One end of the compression spring 840 is cooperated with the seat body 810, and the other end of the compression spring 840 is cooperated with one side of the lower part of the joint plate 830. A rebound space 850 of the compression spring 840 is formed between the seat body 810 and the joint plate 830. The joint tooth 831 is arranged on the other side of the lower part of the joint plate 830 and corresponds to the position of the compression spring 840. The compression spring 840 provides an elastic force towards the transmission assembly 600 for the joint tooth 831.

[0045] When the worm 610 is in normal operation, the compression spring 840 presses the engagement teeth 831 on the engagement plate 830 against the worm 610 to ensure the normal cooperation between the engagement teeth 831 and the worm 610. When an unexpected situation causes a tendency of jamming between the engagement teeth 831 and the worm 610, the force generated during the rotation of the worm 610 will exceed the pressure provided by the compression spring 840, thereby moving the engagement teeth 831 away from the worm 610, that is, towards the spring-back space 850, so that the engagement teeth 831 can disengage from the worm 610 and avoid the occurrence of jamming. After the engagement teeth 831 disengage from the worm 610, under the elastic force of the compression spring 840, the engagement teeth 831 are pressed back to the position of the worm 610 again. If the engagement teeth 831 can cooperate normally with the worm 610 at this time, the engagement teeth 831 and the worm 610 will return to the normal operating state; if there is still a tendency of jamming or the engagement teeth 831 cannot cooperate normally with the worm 610 at this time, the engagement teeth 831 will be pushed again towards the spring-back space 850. Through such repeated movements between the engagement teeth 831 and the worm 610, the situation of jamming between the engagement teeth 831 and the worm 610 can be avoided, and the fault tolerance rate during operation is improved.

[0046] Preferably, the engagement plate 830 includes an upper plate 833, a middle plate 834, and a lower plate 835. The upper plate 833 and the lower plate 835 are vertically arranged. The middle plate 834 is horizontally arranged and is respectively connected to the lower end of the upper plate 833 and the upper end of the lower plate 835. The engagement teeth 831 are arranged on the other surface of the lower part of the lower plate 835, and the engagement bumps 832 are arranged on the upper end of the upper plate 833.

[0047] Preferably, a spring socket 836 is arranged on one side of the lower part of the lower plate 835, and the other end of the compression spring 840 is socketed with the spring socket 836.

[0048] Preferably, the engagement plate 830 further includes a reinforcing plate 837. The reinforcing plate 837 is horizontally arranged and is connected to the upper end of the upper plate 833.

[0049] In summary, the above are only the preferred embodiments of the present invention. All equivalent changes and modifications made within the scope of the patent application of the present invention shall fall within the scope covered by the present invention.

Claims

1. A lifting and anti-stuck structure for a lawn mower, comprising a base (100), a control system (300), and a lifting and driving mechanism (500), characterized in that: The machine also comprises a fixed seat (400), a transmission assembly (600), a guide rail assembly (700), and a cutting knife assembly connecting seat (800); the fixed seat (400) and the guide rail assembly (700) are connected to the machine base (100); the lifting drive mechanism (500) and the transmission assembly (600) are respectively arranged on the fixed seat (400); a lifting through hole (110) is arranged on the machine base (100); the cutting knife assembly connecting seat (800) passes through the lifting through hole (110); and the cutting knife assembly connecting seat (800) is slidably connected to the machine base (100). The guide rail assembly (700) is mounted on the guide rail assembly (700) and cooperates with the transmission assembly (600). The lifting drive mechanism (500) drives the cutting knife assembly connection seat (800) to move up and down at the lifting through hole (110) through the transmission assembly (600). The lifting drive mechanism (500) is electrically connected to the control system (300). The transmission assembly (600) includes a worm (610) and a transmission gear (620). A hollow shaft limiting space (611) is provided inside the worm (610). A center The central shaft (410) extends into the shaft limiting space (611) of the worm (610), the lifting drive mechanism (500) meshes with the transmission gear (620) and drives the worm (610) to rotate through the transmission gear (620), the cutting knife assembly connecting seat (800) is provided with engaging teeth (831), the worm (610) meshes with the engaging teeth (831) of the cutting knife assembly connecting seat (800) and drives the cutting knife assembly connecting seat (800) to move up and down; and also includes a gear spring (630), the transmission The gear (620) is sleeved on the worm (610); the upper end of the transmission gear (620) is provided with a male ratchet (621); the lower part of the worm (610) is provided with a tooth seat (612); the lower end of the tooth seat (612) is provided with a female ratchet (613); the male ratchet (621) of the transmission gear (620) matches with the female ratchet (613) of the tooth seat (612); the gear spring (630) matches with the transmission gear (620) and provides the transmission gear (620) with an elastic force toward the tooth seat (612).

2. The anti-stuck structure for lifting the lawn mower according to claim 1, characterized in that: The cutting knife assembly connecting seat (800) comprises a seat body (810), a slider (820), and a coupling plate (830), wherein one side of the slider (820) is connected to the seat body (810), and the other side of the slider (820) is slidably connected to the guide rail assembly (700), and one side of the coupling plate (830) is connected to the seat body (810), and the coupling teeth (831) are arranged on the other side of the coupling plate (830) and mesh with the transmission assembly (600), and the transmission assembly (600) drives the coupling plate (830) to move up and down through the coupling teeth (831) and drives the seat body (810) to move synchronously.

3. The anti-stuck structure for lifting the lawn mower according to claim 2, characterized in that: The upper end of the seat body (810) is provided with a U-shaped groove (811), one side of the inner surface of the U-shaped groove (811) is provided with a stop block (812), and the other side of the inner surface of the U-shaped groove (811) cooperates with the stop block (812) to form a disengagement space (813), and the upper end of the coupling plate (830) is provided with a coupling protrusion (832) that cooperates with the U-shaped groove (811) of the seat body (810), and the coupling protrusion (832) is semi-cylindrical, and the diameter of the coupling protrusion (832) is larger than the disengagement space (813), and the radius of the coupling protrusion (832) is smaller than the disengagement space (813).

4. The anti-stuck structure for lifting the lawn mower according to claim 3, characterized in that: It also includes a compression spring (840), one end of which cooperates with the seat body (810), and the other end of the compression spring (840) cooperates with one side of the lower part of the coupling plate (830), and a rebound space (850) for the compression spring (840) is formed between the seat body (810) and the coupling plate (830), and the coupling tooth (831) is arranged on the other side of the lower part of the coupling plate (830) and corresponds to the position of the compression spring (840), and the compression spring (840) provides an elastic force for the coupling tooth (831) toward the transmission assembly (600).

5. The anti-stuck structure for lifting the lawn mower according to claim 4, characterized in that: The coupling plate (830) includes an upper plate (833), a middle plate (834), and a lower plate (835); the upper plate (833) and the lower plate (835) are arranged vertically, the middle plate (834) is arranged horizontally and respectively connects the lower end of the upper plate (833) and the upper end of the lower plate (835); the coupling teeth (831) are arranged on the other side surface of the lower part of the lower plate (835), and the coupling protrusion (832) is arranged on the upper end of the upper plate (833).

6. The anti-stuck structure for lifting the lawn mower according to claim 5, characterized in that: A spring sleeve platform (836) is provided on one side of the lower portion of the lower section plate (835), and the other end of the compression spring (840) is sleeved with the spring sleeve platform (836).

7. The anti-stuck structure for lifting a lawn mower according to claim 5, characterized in that: The joint plate (830) further comprises a reinforcing plate (837), wherein the reinforcing plate (837) is disposed transversely and connected to the upper end of the upper section plate (833).

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