Lawn mower and height adjusting method

Abstract

The invention provides a mower and a height adjusting method, and belongs to the technical field of gardening tools. The mower comprises an operation assembly, a driving motor, a gear assembly, a clutch assembly and an adjusting assembly, the driving motor drives the gear assembly to rotate through the clutch assembly, and the clutch assembly comprises a connecting shaft movably connected with the driving motor so as to achieve separation and meshing of the driving motor and the gear assembly; the adjusting assembly comprises an adjusting rod, the adjusting rod is connected with the gear assembly and can be driven by the gear assembly to ascend and descend in a reciprocating mode so as to drive the operation device to ascend and descend in a reciprocating mode, and the adjusting rod is provided with an end abutting against the gear assembly so as to limit rotation of the gear assembly and enable the driving motor to be separated from the connecting shaft. According to the mower, the connecting shaft movably connected with the driving motor is arranged, the connecting shaft can be separated from the driving motor, the driving motor is made to idle, damage caused by overload of the driving motor is avoided, intelligence of the operation device is achieved, and the experience feeling of a user is improved.

Description

Technical Field

[0001] The invention relates to a lawn mower and a height adjustment method, belonging to the technical field of garden tools. Background Art

[0002] At present, lawn mowers have been widely used in the field of garden tools. Researchers have designed a lawn mower with adjustable cutting blade height to adapt to different environments and to mow lawns of different heights according to different needs. However, existing lawn mowers basically require manual adjustment of the cutting blade height, and the lawn mower cannot be made intelligent, resulting in a poor user experience.

[0003] In view of this, it is necessary to propose improvements to the lawn mower to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a lawn mower and a height adjustment method to solve the technical problem of manually adjusting the height of the cutting blade in the prior art.

[0005] To achieve the above object, the present invention provides a lawn mower for adjusting the height of a working device relative to a working surface, comprising:

[0006] Operating equipment;

[0007] Drive motor;

[0008] A gear assembly is connected to the driving motor so that the driving motor drives the gear assembly to rotate;

[0009] A clutch assembly, comprising a connecting shaft disposed between the drive motor and the gear assembly, wherein the connecting shaft is movably connected to the drive motor to achieve separation and engagement of the drive motor and the gear assembly;

[0010] An adjusting component is connected to the working device, and the adjusting component includes an adjusting rod. The adjusting rod is connected to the gear assembly and can be lifted and lowered reciprocatingly under the drive of the gear assembly to drive the working device to be lifted and lowered reciprocatingly, thereby adjusting the height of the working device relative to the working surface. The adjusting rod is provided with an end portion, and the end portion can abut against the gear assembly to limit the rotation of the gear assembly, so that the driving motor is separated from the connecting shaft.

[0011] As a further improvement of the present invention, the gear assembly includes a first gear and a connecting part arranged on the axial center line of the first gear, the connecting shaft is movably connected to the connecting part, the driving motor includes an output shaft and a sleeve arranged on the output shaft, the sleeve rotates synchronously with the output shaft, at least a portion of the sleeve is accommodated in the connecting part and abuts against the connecting shaft, so that the driving motor drives the first gear to rotate through the connecting shaft.

[0012] As a further improvement of the present invention, the shaft sleeve is provided with a first limiting groove, and the connecting part is provided with a second limiting groove partially overlapping with the first limiting groove, and the connecting shaft can move in the second limiting groove and be accommodated in the overlapping part of the first limiting groove and the second limiting groove, so that the output shaft is engaged with the first gear; the connecting shaft moves out of the overlapping part of the first limiting groove and the second limiting groove, and the output shaft is separated from the first gear.

[0013] As a further improvement of the present invention, the first limiting groove is recessed from the end face of the sleeve along the axial centerline direction of the first gear, the recessed direction of the second limiting groove is the same as the recessed direction of the first limiting groove, the first limiting groove is arc-shaped, and the connecting shaft is cylindrical.

[0014] As a further improvement of the present invention, the lawn mower includes an outer frame, and the clutch assembly includes an elastic member, which is arranged between the connecting shaft and the outer frame to keep the connecting shaft accommodated in the overlapping portion of the first limiting groove and the second limiting groove.

[0015] As a further improvement of the present invention, the gear assembly includes a second gear meshing with the first gear, the second gear is provided with a through hole, the adjustment rod is accommodated in the through hole, and can be lifted and lowered reciprocatingly in the through hole.

[0016] As a further improvement of the present invention, an internal thread is provided on the inner wall surface of the through hole, and an external thread is provided on the outer wall surface of the adjusting rod. The external thread meshes with the internal thread, and the second gear rotates to drive the adjusting rod to reciprocate and rise and fall.

[0017] As a further improvement of the present invention, the operating device includes a fixed plate connected to the end, and the adjusting rod rises or falls under the drive of the internal thread until the fixed plate abuts against the gear assembly to limit the rotation of the gear assembly.

[0018] As a further improvement of the present invention, the adjustment component also includes a positioning piece and a plurality of positioning teeth distributed on the positioning piece, the lawn mower includes a sensing device and a sensing slot provided on the sensing device, at least part of the positioning teeth extends into the sensing slot, and when the adjustment component reciprocates and rises and falls, the positioning teeth move in the sensing slot.

[0019] To achieve the above object, the present invention provides a height adjustment method, which is applied to the above-mentioned lawn mower, comprising:

[0020] The driving motor drives the gear assembly to rotate through the clutch assembly, and the gear assembly drives the adjusting rod to rise or fall;

[0021] When the end of the adjusting rod abuts against the gear assembly, the gear assembly stops rotating, and the clutch assembly is separated, so that the driving motor idles;

[0022] When the control component detects that the current of the drive motor changes, it controls the drive motor to stop rotating or rotate in the reverse direction.

[0023] As a further improvement of the present invention, when the gear assembly stops rotating, the connecting shaft slides out of the first limiting groove under the push of the output shaft and squeezes the elastic member, so that the driving motor is separated from the gear assembly.

[0024] As a further improvement of the present invention, the current when the drive motor drives the gear assembly to rotate is different from the current when the drive motor is idling. When the control component detects that the current of the drive motor has changed, it controls the drive motor to stop rotating or rotate in the opposite direction.

[0025] As a further improvement of the present invention, when the control center controls the drive motor to rotate in the opposite direction, the elastic member releases the elastic force, so that the connecting shaft enters the first limit groove, the output shaft meshes with the gear assembly and drives the gear assembly to rotate, so that the adjusting rod rises or falls in the opposite direction.

[0026] As a further improvement of the present invention, the control component is in communication connection with the sensing device, and defines that the end of the adjusting rod abuts against the gear component as the zero point, and when the operating device needs to be adjusted to a specified height, the control component matches the specified height with the number of positioning teeth;

[0027] The driving motor drives the adjusting rod to the zero point;

[0028] The driving motor rotates in the reverse direction, and the sensing device detects the number of positioning teeth passing through the sensing slot. When the number reaches the number matching the specified height, the control component controls the driving motor to stop rotating.

[0029] The beneficial effects of the present invention are as follows: the lawn mower of the present invention drives the gear assembly to rotate through the driving motor, and then drives the adjusting rod to reciprocate and rise and fall, thereby realizing automatic adjustment of the height between the working device and the working surface, and improving the user experience; by providing a connecting shaft movably connected to the driving motor between the gear assembly and the driving motor, when the end of the adjusting rod abuts against the gear assembly, the connecting shaft is separated from the driving motor, so that the driving motor idles, avoiding damage caused by overload of the driving motor, extending the service life, and further realizing the intelligence of the working device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a partial three-dimensional schematic diagram of a lawn mower according to a preferred embodiment of the present invention.

[0031] Figure 2yes Figure 1 Exploded view of the middle height adjustment device and the working device.

[0032] Figure 3 yes Figure 2 A partial enlarged view of part A.

[0033] Figure 4 yes Figure 2 Exploded view of the drive motor and bushing.

[0034] Figure 5 yes Figure 2 Cross-sectional view of the mid-height adjustment device.

[0035] Figure 6 yes Figure 5 A partial enlarged view of part B.

[0036] Figure 7 yes Figure 2 Schematic diagram of the three-dimensional adjustment component.

[0037] Figure 8 yes Figure 2 Schematic diagram of the middle and outer frames and sensing devices.

[0038] Fig. 9 yes Figure 2 Schematic diagram of the center sleeve.

[0039] Fig.10 yes Figure 2 Schematic diagram of the first gear in FIG.

[0040] Explanation of the accompanying drawings: lawn mower 100, height adjustment device 200, drive motor 1, output shaft 11, second limiting surface 111, gear assembly 2, first gear 21, connecting part 211, second limiting groove 212, transmission hole 213, accommodating groove 214, second gear 22, through hole 221, internal thread 222, clutch assembly 3, sleeve 31, first limiting groove 311, shaft hole 312, first limiting surface 313, connecting shaft 32, elastic member 33, outer frame 4, accommodating chamber 41, sliding assembly 42, working hole 43, abutting groove 44, adjusting assembly 5, adjusting rod 51, end 511, external thread 512, fixing plate 52, positioning member 53, positioning tooth 531, adjusting body 54, sensing device 6, sensing groove 61, working device 300, main body 400. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] See also Figure 1As shown, the present invention discloses a lawn mower 100 for mowing lawns. The lawn mower 100 includes a main body 400, an energy storage device (not shown), a traveling device (not shown), a detection device (not shown), a height adjustment device 200 and an operating device 300, wherein the main body 400, the energy storage device, the traveling device and the detection device can be designed according to the actual situation and in accordance with the prior art, and are not described in detail herein. The height adjustment device 200 and the operating device 300 are both arranged in the main body 400 and are interconnected, and the height adjustment device 200 can drive the operating device 300 to move upward or downward relative to the operating surface to adjust the height of the operating device 300 relative to the operating surface (not shown) to adapt to lawns in different environments and to mow lawns of different heights.

[0043] In this embodiment, the working device 300 is the cutting blade device on the lawn mower 100. Of course, in other embodiments, the working device 300 can also be a punching device, a cleaning device, or other device that needs to be adjusted to different heights according to different environments, which is not limited here.

[0044] In this embodiment, the working surface is a lawn or the ground, and the height-adjusting device 200 is interpreted as a device for driving the cutting knife device to move so as to adjust the height between the cutting knife device and the ground. Of course, in other embodiments, the height-adjusting device 200 can also be interpreted as a device for driving the cutting knife device to move so as to adjust the size between the cutting knife device and the working surface. In this case, the working surface can be set at a certain angle to the ground, which is not limited here.

[0045] See also Figure 2 Combined with Figure 8 As shown, the height-adjusting device 200 includes a driving motor 1, a gear assembly 2, a clutch assembly 3, an outer frame 4 and an adjusting assembly 5, wherein a receiving chamber 41 is provided in the outer frame 4, and the driving motor 1, the gear assembly 2, the clutch assembly 3 and the adjusting assembly 5 are all received in the receiving chamber 41. On the one hand, the outer frame 4 protects them from external collisions and damage, and on the other hand, the outer frame 4 integrates them into a whole for easy installation and disassembly. Specifically, the driving motor 1 and the gear assembly 2 are fixed on the outer frame 4 to prevent the driving motor 1 and the gear assembly 2 from shaking during use. The operating device 300 is connected to the adjusting assembly 5 and is disposed at the end of the adjusting assembly 5 close to the working surface. The driving motor 1 drives the adjusting assembly 5 to rise and fall through the gear assembly 2, and the adjusting assembly 5 drives the operating device 300 to move to adjust the distance between the operating device 300 and the working surface.

[0046] The outer frame 4 is also provided with an operating hole 43 connected to the receiving cavity 41 and a sliding component 42 arranged corresponding to the operating hole 43. The adjusting component 5 is received in the receiving cavity 41 and connected to the outer frame 4 through the sliding component 42. The adjusting component 5 can slide along the sliding component 42, so that part of the adjusting component 5 can move upward or downward in the operating hole 43. By setting the sliding component 42, the stability of the operating device 300 during movement is improved.

[0047] In this embodiment, the outer frame 4 is detachably installed in the main body 400 to protect the drive motor 1, the gear assembly 2, the clutch assembly 3, the adjustment assembly 5 and the operating device 300. Of course, in other embodiments, the outer frame 4 can also be designed as an integral part with the main body 400, which is not limited here.

[0048] The driving motor 1 is connected to the gear assembly 2 so that the driving motor 1 drives the gear assembly 2 to rotate. The clutch assembly 3 includes a connecting shaft 32 arranged between the driving motor 1 and the gear assembly 2. The connecting shaft 32 is movably connected to the driving motor 1 to realize the separation and engagement of the driving motor 1 and the gear assembly 2. The adjusting assembly 5 includes an adjusting rod 51. The adjusting rod 51 is connected to the gear assembly 2 and can be reciprocated and lifted under the drive of the gear assembly 2 to drive the working device 300 to reciprocate and lift. The adjusting rod 51 is provided with an end 511, and the end 511 can abut against the gear assembly 2 to limit the rotation of the gear assembly 2. At this time, the driving motor 1 is separated from the connecting shaft 32, so that the driving motor 1 rotates relative to the gear assembly 2, thereby avoiding damage to the driving motor 1 due to increased driving resistance.

[0049] Combination Figure 4 As shown, the drive motor 1 includes an output shaft 11 and a sleeve 31 sleeved on the output shaft 11. The drive motor 1 is connected to the output shaft 11 and can drive the output shaft 11 to rotate. The sleeve 31 rotates synchronously with the output shaft 11. The sleeve 31 is meshed with the gear assembly 2 through the output shaft 11, so that the drive motor 1 drives the gear assembly 2 to rotate, and then drives the adjusting rod 51 to reciprocate and rise and fall, and then drives the working device 300 to reciprocate and rise and fall, so as to adjust the height of the working device 300 relative to the working surface; when the sleeve 31 is separated from the connecting shaft 32, the output shaft 11 and the sleeve 31 idle under the drive of the drive motor 1, and the gear assembly 2 remains stationary to maintain the height between the working device 300 and the working surface.

[0050] Among them, in order to make the lawn mower 100 intelligent and avoid the separation of the adjusting rod 51 and the gear assembly 2, end portions 511 are provided at both ends of the adjusting rod 51, and the gear assembly 2 drives the adjusting rod 51 to move back and forth. When the end portion 511 abuts against the gear assembly 2, due to the limitation of the end portion 511, the adjusting rod 51 will not slip out of the gear assembly 2. At the same time, due to the abutment of the end portion 511 with the gear assembly 2, the gear assembly 2 stops rotating, the output shaft 11 is separated from the connecting shaft 32, and the driving motor 1 is caused to idle, thereby avoiding damage caused by excessive load on the driving motor 1 and extending the service life of the height adjustment device 200.

[0051] The lawn mower 100 includes a control component (not shown), which can monitor the current changes of the motor 12 and can control the drive motor 1 to stop rotating or rotate in the reverse direction. The control component can be electrically connected to a circuit board that supplies power to the drive motor 1 to monitor the current of the drive motor 1 and control the drive motor 1 to stop rotating or rotate in the reverse direction; the control component can also be directly electrically connected to the drive motor 1 to monitor the current of the drive motor 1 and control the drive motor 1, which is not limited here.

[0052] See also Figures 2 to 10 As shown, the gear assembly 2 includes a first gear 21 and a connecting portion 211 disposed on the axis of the first gear 21, and the clutch assembly 3 includes a connecting shaft 32 movably connected to the connecting portion 211. Specifically, the connecting portion 211 extends from the first gear 21 in a direction away from the motor 12, and a transmission hole 213 for accommodating the shaft sleeve 31 is provided on the connecting portion 211. The connecting shaft 32 is disposed at the bottom of the transmission hole 213. The shaft sleeve 31 extends into the transmission hole 213 and can abut or separate from the connecting shaft 32, so that the shaft sleeve 31 can drive the connecting portion 211 to rotate or idle, so as to achieve the separation or engagement of the drive motor 1 and the gear assembly 2.

[0053] The sleeve 31 is provided with a first limiting groove 311, the connecting portion 211 and a second limiting groove 212, and the first limiting groove 311 and the second limiting groove 212 partially overlap in the height direction. The connecting shaft 32 can move up and down in the second limiting groove 212, and when the connecting shaft 32 is received in the overlapping portion of the first limiting groove 311 and the second limiting groove 212, the sleeve 31 is engaged with the first gear 21; when the connecting shaft 32 moves out of the overlapping portion of the first limiting groove 311 and the second limiting groove 212, the sleeve 31 is separated from the first gear 21.

[0054] Specifically, the first limiting groove 311 is recessed from the end surface of the sleeve 31 along the axial direction of the first gear 21, and the first limiting groove 311 is arranged in a semicircular arc shape, and the recessed direction of the second limiting groove 212 is the same as the recessed direction of the first limiting groove 311, that is, the second limiting groove 212 is recessed from the side of the connecting portion 211 away from the motor 12 toward the motor 12, and the second limiting groove 212 is connected to the transmission hole 213, the sleeve 31 is accommodated in the transmission hole 213, and the first limiting groove 311 can overlap with part of the second limiting groove 212, the connecting shaft 32 is cylindrical in shape matching the first limiting groove 311, and can move in the second limiting groove 212 along the axial direction of the first gear 21.

[0055] Please refer to Figure 4 As shown, the shaft sleeve 31 is provided with a shaft hole 312 and a first limiting surface 313 arranged in the shaft hole 312. The size of the shaft hole 312 is the same as that of the output shaft 11, so that the output shaft 11 can extend into the shaft hole 312 to drive the shaft sleeve 31 to rotate. A second limiting surface 111 is provided on the outer wall surface of the output shaft 11. When the output shaft 11 is accommodated in the shaft hole 312, the first limiting surface 313 abuts against the second limiting surface 111 to prevent the output shaft 11 from rotating relative to the shaft sleeve 31 in the shaft hole 312. Specifically, the first limiting surface 313 makes it impossible for the shaft hole 312 to form a complete circle, and the second limiting surface 111 also makes it impossible for the output shaft 11 to form a complete circle, so that the output shaft 11 and the shaft sleeve 31 can achieve synchronous rotation.

[0056] In this embodiment, a shaft sleeve 31 is provided on the output shaft 11, and the shaft sleeve 31 is engaged or separated with the connecting shaft 32 to realize that the driving motor 1 drives the gear assembly 2 to rotate or does not drive the gear assembly 2 to rotate. The first limiting groove 311 is set in a semicircular arc shape, and the connecting shaft 32 is set in a cylindrical shape. Of course, in other embodiments, the shaft sleeve 31 may not be set on the output shaft 11, and the first limiting groove 311 may be directly set at the end of the output shaft 11. The first limiting groove 311 may be set in a triangle, a quarter arc shape, etc., and the connecting shaft 32 may be designed in other shapes such as a square. As long as the connecting shaft 32 can partially extend into the first limiting groove 311, so that the output shaft 11 can drive the first gear 21 to rotate, and the connecting shaft 32 can also slide out of the first limiting groove 311, there is no limitation here.

[0057] In this embodiment, the first limiting groove 311 and the second limiting groove 212 are both opened in the axial direction of the first gear 21. Of course, in other embodiments, the first limiting groove 311 can be arranged on the side of the sleeve 31 or the output shaft 11, and the second limiting groove 212 is correspondingly arranged on the side of the connecting part 211, and the first limiting groove 311 overlaps with part of the second limiting groove 212 to realize the separation and engagement of the drive motor 1 and the gear assembly 2, which is not limited here.

[0058] The clutch assembly 3 includes an elastic member 33, which is disposed between the connecting shaft 32 and the outer frame 4 to keep the connecting shaft 32 contained in the overlapping portion of the first limiting groove 311 and the second limiting groove 212. Specifically, the outer frame 4 is provided with an abutment groove 44, which is disposed opposite to the connecting portion 211 and is recessed in a direction away from the connecting portion 211. The first gear 21 is provided with an accommodating groove 214, which is disposed around the connecting portion 211. In the direction of the axial centerline of the first gear 21, the depth of the accommodating groove 214 is not less than the depth of the second limiting groove 212, so that the second limiting groove 212 can be connected to the accommodating groove 214. The middle position of the connecting shaft 32 is contained in the second limiting groove 212, and the ends 511 on both sides are contained in the accommodating groove 214.

[0059] One end of the elastic member 33 is received in the abutment groove 44, and the other end is received in the accommodating groove 214 and abuts against the connecting shaft 32. Such arrangement enables the connecting shaft 32 to be disposed at the bottom of the second limiting groove 212 under the elastic force of the elastic member 33, and to be partially received in the first limiting groove 311, so that the output shaft 11 can drive the first gear 21 to rotate.

[0060] When the first gear 21 stops rotating under the restriction of the adjusting assembly 5, the output shaft 11 pushes the connecting shaft 32 through the groove wall of the first limiting groove 311, so that the connecting shaft 32 moves in the direction away from the output shaft 11, and at the same time squeezes the elastic member 33 to realize the separation of the driving motor 1 and the gear assembly 2; when the output shaft 11 rotates until the first limiting groove 311 overlaps with the second limiting groove 212, the connecting shaft 32 moves toward the motor 12 driven by the elastic force of the elastic member 33 to enter the overlapping part of the first limiting groove 311 and the second limiting groove 212 to realize the engagement of the driving motor 1 and the gear assembly 2.

[0061] In this embodiment, the elastic member 33 is a spring, and an abutment groove 44 for accommodating the spring is provided on the outer frame 4, and the spring is accommodated in the abutment groove 44 and fixedly connected to the outer frame 4. Of course, in other embodiments, the elastic member 33 may also be other elastic components such as rubber products, and the abutment groove 44 may not be provided on the outer frame 4. In this case, the elastic member 33 is directly connected to the outer frame 4, or an abutment column is provided on the outer frame 4, and the elastic member 33 is sleeved on the outside of the abutment column and connected to the abutment column. There is no limitation here.

[0062] Please refer to Figure 2 and Figure 3As shown, the gear assembly 2 includes a second gear 22 meshing with the first gear 21, and the second gear 22 is provided with a through hole 221. The adjustment rod 51 is received in the through hole 221 and can be lifted and lowered reciprocatingly in the through hole 221. Specifically, the second gear 22 is arranged side by side with the first gear 21, and the first gear 21 and the second gear 22 are both provided with racks. The first gear 21 and the second gear 22 are meshed through the racks to realize that the first gear 21 drives the second gear 22 to rotate. Preferably, the number of racks on the first gear 21 is less than the number of racks on the second gear 22 to increase the driving force of the second gear 22. Of course, in other embodiments, the number of racks on the first gear 21 can be equal to or greater than the number of racks on the second gear 22, which is not limited here.

[0063] Combination Figure 7 As shown, an internal thread 222 is provided on the inner wall surface of the through hole 221, and an external thread 513 is provided on the outer wall surface of the adjusting rod 51. The internal thread 222 is meshed with the external thread 513, so that when the second gear 22 rotates, the adjusting rod 51 can be driven to rise and fall back and forth. Specifically, the second gear 22 is threadedly connected to the adjusting rod 51, and the adjusting rod 51 is driven to rise and fall back and forth by the thread. The adjusting rod 51 is driven to rise and fall back and forth by the second gear 22, and the adjusting assembly 5 is connected to the working device 300, thereby driving the working device 300 to rise and fall back and forth to change the size between the working device 300 and the working surface. In this way, the adjusting rod 51 can move in the vertical direction, and the adjusting rod 51 will not rotate.

[0064] The gear assembly 2 also includes side plates (not shown) provided on the upper and lower sides of the first gear 21 and the second gear 22 and bearings (not shown) provided on the side plates. The gear assembly 2 is fixed to the outer frame 4 through the side plates, and the second gear 22 is connected to the side plates through the bearings to fix the gear assembly 2 on the outer frame 4 to prevent the gear assembly 2 from shaking during rotation.

[0065] The adjustment assembly 5 includes a fixing plate 52 connected to the end 511 and an adjustment body 54 for accommodating the operation device 300. The adjustment rod 51 is fixedly connected to the adjustment body 54 through the fixing plate 52, so that the adjustment rod 51 can drive the adjustment body 54 to move. The adjustment rod 51 moves under the drive of the internal thread 222 until the fixing plate 52 abuts against the gear assembly 2 to limit the rotation of the gear assembly 2. Specifically, two fixing plates 52 are provided, and are respectively provided at both ends of the adjustment rod 51.

[0066] The external thread 512 on the adjusting rod 51 is distributed between the two fixing plates 52, and the end of the external thread 512 is arranged beside the fixing plate 52, so that when the adjusting rod 51 moves, the fixing plate 52 can abut against the second gear 22 to limit the rotation of the second gear 22. Of course, in other embodiments, there may be a certain distance between the end of the external thread 512 and the fixing plate 52, and the distance is less than the thickness of the second gear 22, so that when the second gear 22 abuts against the fixing plate 52, part of the internal thread 222 of the second gear 22 meshes with part of the external thread 512 on the adjusting rod 51; a protrusion (not shown) may also be provided at the end of the external thread 512 of the adjusting rod 51, and the protrusion abuts against the end of the internal thread 222 to limit the rotation of the second gear 22. As long as the purpose of limiting the rotation of the second gear 22 by the adjusting rod 51 can be achieved, no limitation is made here.

[0067] See also Figure 7 and Figure 8 As shown, the adjustment component 5 further includes a positioning member 53 and a plurality of positioning teeth 531 distributed on the positioning member 53. The setting direction of the positioning member 53 is the same as the lifting direction of the adjustment rod 51. The lawn mower 100 includes a sensing device 6 and a sensing slot 61 provided on the sensing device 6. At least part of the positioning teeth 531 extends into the sensing slot 61. When the adjustment component 5 is lifted and lowered back and forth, the positioning teeth 531 move in the sensing slot 61. Specifically, the positioning member 53 is provided on the outer wall surface of the adjustment body 54. The plurality of positioning teeth 531 are arranged in a zigzag shape on the positioning member 53. The sensing device 6 is provided between the outer frame 4 and the adjustment body 54 and connected to the outer frame 4. The sensing slot 61 is provided on the side of the sensing device 6 away from the outer frame 4. When the adjustment component 5 moves up and down, the positioning teeth 531 move in the sensing slot 61. The sensing device 6 detects the amount of movement of the positioning teeth 531, and then detects the height of the adjustment component 5 moving up and down. Preferably, the sensing device 6 is a grating, and one side wall of the sensing slot 61 emits light, and the other side wall receives light. When the positioning tooth 531 is located in the sensing slot 61, the light is blocked by the positioning tooth 531. When the gap between two adjacent positioning teeth 531 is located in the sensing slot 61, the light is not blocked. This method is used to detect the number of positioning teeth 531 passing through the sensing slot 61, and then determine the rising height or falling height of the adjustment component 5.

[0068] In this embodiment, the operating device 300 is a cutting knife assembly. The specific structure and connection method of the cutting knife assembly can be set according to the existing technology and are not limited here.

[0069] The present invention also discloses a height adjustment method, which specifically comprises:

[0070] The driving motor 1 drives the gear assembly 2 to rotate through the clutch assembly 3, and the gear assembly 2 drives the adjusting rod 51 to rise or fall.

[0071] Specifically, the connecting shaft 32 is received in the overlapping part of the first limiting groove 311 and the second limiting groove 212 under the action of the elastic member 33, and the output shaft 11 is connected to the first gear 21 through the sleeve 31 and the connecting shaft 32. When the motor 12 drives the output shaft 11 to rotate, the output shaft 11 drives the sleeve 31 to rotate, and then drives the first gear 21 and the second gear 22 to rotate through the connecting shaft 32. The rotation of the second gear 22 causes the internal thread provided in the through hole 221 to rotate, so as to drive the adjusting rod 51 to move relative to the working surface, thereby changing the distance between the working device 300 and the working surface.

[0072] When the end 511 of the adjusting rod 51 contacts the gear assembly 2 , the gear assembly 2 stops rotating, and the clutch assembly 3 is disengaged, so that the driving motor 1 idles.

[0073] Specifically, when the gear assembly 2 stops rotating, the connecting shaft 32 slides out of the first limiting groove 311 under the push of the output shaft 11, and at the same time squeezes the elastic member 33, so that the output shaft 11 is separated from the gear assembly 2, and the driving motor 1 drives the output shaft 11 to idle, at this time, the gear assembly 2 and the adjusting rod 51 remain stationary. Among them, the output shaft 11 pushes the connecting shaft 32 to slide out of the first limiting groove 311, so that the first limiting groove 311 intersects with the second limiting groove 212, when the first limiting groove 311 rotates to partially overlap with the second limiting groove 212, the connecting shaft 32 enters the first limiting groove 311 under the push of the elastic member 33, and then is pushed out of the limiting groove again by the output shaft 11, and so on is repeated, so that the output shaft 11 rotates relative to the gear assembly 2, of course, if the output shaft 11 reaches a certain speed, the connecting shaft 32 will not enter the first limiting groove 311 under the push of the elastic member 33.

[0074] When the control component detects that the current of the drive motor 1 changes, it controls the drive motor 1 to stop rotating or rotate in the reverse direction.

[0075] When the control assembly controls the driving motor 1 to rotate in the reverse direction, the elastic member 33 releases the elastic force, so that the connecting shaft 32 enters the first limiting groove 311, and the output shaft 11 meshes with the gear assembly 2, driving the gear assembly 2 to rotate, so that the adjusting rod 51 rises or falls in the opposite direction.

[0076] When the control component controls the drive motor 1 to stop rotating, that is, stops supplying power to the motor 12, the motor 12 will rotate under the action of inertia. At this time, the speed of the output shaft 11 decreases. When the connecting shaft 32 enters the first limiting groove 311 under the push of the elastic member 33, and the rotating force of the output shaft 11 cannot push the connecting shaft 32 out of the first limiting groove 311, the output shaft 11 stops rotating.

[0077] Specifically, the current of the drive motor 1 driving the gear assembly 2 to rotate is different from the current of the drive motor 1 when it is idling. When the control component detects that the current of the drive motor 1 has changed, the drive motor 1 is controlled to stop rotating or rotate in the reverse direction. Among them, when the connecting shaft 32 slides out of the first limit groove 311 and the drive motor 1 rotates at a high speed, the connecting shaft 32 cannot enter the first limit groove 311 under the action of the elastic member 33. At this time, the current of the drive motor 1 is less than the current when the drive motor 1 drives the gear assembly 2 to rotate, and the current fluctuation is small at this time; when the connecting shaft 32 slides out of the first limit groove 311 and the drive motor 1 rotates at a low speed, when the connecting shaft 32 repeatedly enters the first limit groove 311 and slides out of the first limit groove 311, the current of the drive motor 1 fluctuates periodically, which may be greater than the current when the gear assembly 2 is driven to rotate, or may be less than the current when the gear assembly 2 is driven to rotate.

[0078] The control component monitors the current changes of the drive motor 1. If the current decreases and the fluctuation is small, or the current changes periodically, it can be determined that the drive motor 1 does not drive the gear assembly 2 to rotate. The motor 12 can be controlled to stop rotating or rotate in the opposite direction according to the actual situation, thereby avoiding the continuous idling of the motor 12 and causing waste of electricity, thereby realizing the intelligent operation of the height adjustment device 200.

[0079] The sensing device 6 is connected to the control component in communication, so that the sensing device 6 can transmit the number of positioning teeth 531 passing through the sensing slot 61 to the control component. When a certain number is reached, the control component controls the drive motor 1 to stop rotating. Specifically, the zero point is defined when the end 511 of the adjustment rod 51 abuts against the gear component 2. When the user needs to adjust the working device 300 to a specified height, the user inputs the specified height data between the working device 300 and the working surface, and the control component matches the specified height with the number of positioning teeth 531, that is, when the number of positioning teeth 531 passes through the sensing slot 61, the height between the working device 300 and the working surface is the specified height.

[0080] The control component controls the drive motor 1 to rotate to drive the adjustment rod 51 to the zero point. At this time, the sensing slot 61 is located at the end of the positioning member 53. Then the control component controls the drive motor 1 to rotate in the opposite direction. The adjustment component 5 moves downward or upward under the drive of the drive motor 1. The positioning teeth 531 move in the sensing slot 61. The sensing slot 61 detects the number of positioning teeth 531 passing through the sensing slot 61. When the number of positioning teeth 531 passing through the sensing slot 61 is equal to the number of positioning teeth 531 corresponding to the specified height, the control component controls the drive motor 1 to stop rotating, so that the working device 300 can stay at this height to operate.

[0081] Specifically, each time the working device 300 is adjusted to a specified height, the driving motor 1 needs to drive the adjusting rod 51 to the zero point and then rotate in the opposite direction so that the working device 300 reaches the specified height to achieve accurate positioning of the working device 300.

[0082] To sum up, the height-adjusting device 200 of the present invention drives the gear assembly 2 to rotate through the driving motor 1, and then drives the adjusting rod 51 to move, thereby realizing automatic adjustment of the height between the working device 300 and the working surface, further realizing the intelligence of the working device 300, and improving the user experience; by setting a clutch assembly 3 between the gear assembly 2 and the driving motor 1, when the end 511 of the adjusting rod 51 abuts against the gear assembly 2, the gear assembly 2 and the driving motor 1 are separated by the clutch device, thereby avoiding damage caused by overload of the driving motor 1, and extending the service life of the height-adjusting device 200; by monitoring the current change of the driving motor 1 through the control component, it is determined whether the driving motor 1 drives the gear assembly 2 to rotate, and then controlling the driving motor 1 to stop rotating or rotate in the opposite direction, thereby avoiding the driving motor 1 idling for a long time, causing waste of electric energy, and further realizing the intelligent control of the lawn mower 100.

[0083] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A lawn mower, characterized in that: include: Operating equipment; Drive motor; A gear assembly is connected to the driving motor so that the driving motor drives the gear assembly to rotate; A clutch assembly, comprising a connecting shaft disposed between the drive motor and the gear assembly, wherein the connecting shaft is movably connected to the drive motor to achieve separation and engagement of the drive motor and the gear assembly; An adjusting component is connected to the working device, and the adjusting component includes an adjusting rod. The adjusting rod is connected to the gear assembly and can be lifted and lowered reciprocatingly under the drive of the gear assembly to drive the working device to be lifted and lowered reciprocatingly, thereby adjusting the height of the working device relative to the working surface. The adjusting rod is provided with an end portion, and the end portion can abut against the gear assembly to limit the rotation of the gear assembly, so that the driving motor is separated from the connecting shaft.

2. The lawn mower according to claim 1, characterized in that: The gear assembly includes a first gear and a connecting portion arranged on the axis center line of the first gear, the connecting shaft is movably connected to the connecting portion, the driving motor includes an output shaft and a sleeve sleeved on the output shaft, the sleeve rotates synchronously with the output shaft, at least a portion of the sleeve is accommodated in the connecting portion and abuts against the connecting shaft, so that the driving motor drives the first gear to rotate through the connecting shaft.

3. The lawn mower according to claim 2, characterized in that: The shaft sleeve is provided with a first limiting groove, and the connecting part is provided with a second limiting groove partially overlapping with the first limiting groove. The connecting shaft can move in the second limiting groove and be accommodated in the overlapping part of the first limiting groove and the second limiting groove, so that the output shaft is engaged with the first gear; when the connecting shaft moves out of the overlapping part of the first limiting groove and the second limiting groove, the output shaft is separated from the first gear.

4. The lawn mower according to claim 3, characterized in that: The first limiting groove is recessed from the end surface of the sleeve along the axial centerline direction of the first gear, the recessed direction of the second limiting groove is the same as that of the first limiting groove, the first limiting groove is in an arc shape, and the connecting shaft is in a cylindrical shape.

5. The lawn mower according to claim 3, characterized in that: The lawn mower comprises an outer frame, and the clutch assembly comprises an elastic member, wherein the elastic member is arranged between the connecting shaft and the outer frame to keep the connecting shaft accommodated in the overlapping portion of the first limiting groove and the second limiting groove.

6. The lawn mower according to claim 2, characterized in that: The gear assembly comprises a second gear meshing with the first gear. The second gear is provided with a through hole. The adjusting rod is received in the through hole and can be lifted and lowered reciprocatingly in the through hole.

7. The lawn mower according to claim 6, characterized in that: An internal thread is arranged on the inner wall surface of the through hole, and an external thread is arranged on the outer wall surface of the adjusting rod. The external thread is meshed with the internal thread, and the second gear rotates to drive the adjusting rod to move up and down reciprocatingly.

8. The lawn mower according to claim 7, characterized in that: The working device comprises a fixing plate connected to the end portion, and the adjusting rod is driven by the internal thread to rise or fall until the fixing plate abuts against the gear assembly to limit the rotation of the gear assembly.

9. The lawn mower according to claim 1, characterized in that: The adjustment component also includes a positioning member and a plurality of positioning teeth distributed on the positioning member. The lawn mower includes a sensing device and a sensing slot provided on the sensing device. At least part of the positioning teeth extends into the sensing slot. When the adjustment component is lifted and lowered reciprocatingly, the positioning teeth move in the sensing slot.

10. A height adjustment method, applied to the lawn mower according to claim 1, characterized in that: include: The driving motor drives the gear assembly to rotate through the clutch assembly, and the gear assembly drives the adjusting rod to rise or fall; When the end of the adjusting rod abuts against the gear assembly, the gear assembly stops rotating, and the clutch assembly is separated, so that the driving motor idles; When the control component detects that the current of the drive motor changes, it controls the drive motor to stop rotating or rotate in the reverse direction.

11. The height adjustment method according to claim 10, characterized in that: When the gear assembly stops rotating, the connecting shaft slides out of the first limiting groove under the push of the output shaft, and at the same time squeezes the elastic member, so that the driving motor is separated from the gear assembly.

12. The height adjustment method according to claim 10, characterized in that: The current when the drive motor drives the gear assembly to rotate is different from the current when the drive motor is idling. When the control component detects that the current of the drive motor has changed, the drive motor is controlled to stop rotating or rotate in the reverse direction.

13. The height adjustment method according to claim 10, characterized in that: When the control component controls the driving motor to rotate in the reverse direction, the elastic member releases the elastic force, so that the connecting shaft enters the first limiting groove, the output shaft meshes with the gear component and drives the gear component to rotate, so that the adjusting rod rises or falls in the opposite direction.

14. The height adjustment method according to claim 10, characterized in that: The control component is in communication with the sensing device, and defines the zero point as when the end of the adjustment rod abuts against the gear component. When the operating device needs to be adjusted to a specified height, the control component matches the specified height with the number of positioning teeth. The driving motor drives the adjusting rod to the zero point; The driving motor rotates in the reverse direction, and the sensing device detects the number of positioning teeth passing through the sensing slot. When the number reaches the number matching the specified height, the control component controls the driving motor to stop rotating.

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