Height adjustment device and mower with the same

Abstract

The application relates to the technical field of lawn mowers, in particular to a height adjusting device and a lawn mower with the same. The lawn mower comprises a working component, a jacking mechanism, a moving mechanism and a driving mechanism. The jacking mechanism is provided with a guide rail part, the guide rail part comprises a guide surface, the guide surface has a first end and a second end in the height direction of the guide rail part in sequence, and the jacking mechanism is connected with the working component; the moving mechanism is provided with a protruding part, the protruding part is in transmission abutment with the guide surface; and the driving mechanism is connected with the moving mechanism, the driving mechanism is used for driving the moving mechanism to move in the direction intersecting with the height direction of the guide rail part, so as to drive the protruding part to move along the guide surface towards the first end or the second end, and to make the jacking mechanism be lifted or lowered relative to the moving mechanism. When the working component is a cutter head, the lawn mower can adjust the height of the cutter head, reduce the collision between the cutter head and the undulating terrain, maintain the normal work of the lawn mower and protect the lawn mower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mowing, in particular to a height adjusting device and a mower with the same. BACKGROUND

[0002] The current mower is difficult to meet the mowing requirements of diversified undulating terrain. If the mower cannot adjust the height of the cutter head according to the terrain, the cutter head may collide with the protruding terrain, which will hinder the work of the mower and even damage the mower. SUMMARY

[0003] Therefore, it is necessary to provide a height adjusting device and a mower with the same to solve the problem that the mower cannot adjust the height of the cutter head according to the terrain, the cutter head may collide with the protruding terrain, which will hinder the work of the mower and even damage the mower.

[0004] In a first aspect, a height adjusting device for adjusting a working component, comprising:

[0005] a jacking mechanism, provided with a guide rail part, the guide rail part comprising a guide surface, along the height direction of the guide rail part, the guide surface sequentially has a first end and a second end, the jacking mechanism is connected with the working component;

[0006] a moving mechanism, the moving mechanism is provided with a protruding part, the protruding part is in transmission abutment with the guide surface; and

[0007] a driving mechanism, the driving mechanism is connected with the moving mechanism, the driving mechanism is used for driving the moving mechanism to move in a direction intersecting with the height direction of the guide rail part, so as to drive the protruding part to move along the guide surface in the direction towards the first end or the second end, so as to make the jacking mechanism raise or lower relative to the moving mechanism.

[0008] In one of the embodiments, the guide rail part comprises an arc-shaped top cover and side walls provided on both sides of the arc-shaped top cover, the arc-shaped top cover has the guide surface, the side walls comprise connected arc edges and inclined edges, the arc edges are connected with the arc-shaped top cover, and the inclined edges form openings with the arc-shaped top cover for the transmission abutment of the protruding part with the guide surface.

[0009] In one of the embodiments, along the height direction of the protruding part, the protruding part comprises opposite top and bottom surfaces;

[0010] The protruding part further comprises a first convex surface, the first convex surface protrudes in a direction away from the top surface, the first convex surface has a first edge and a second edge along its own bending direction, the top surface is connected to the first edge, the bottom surface is connected to the second edge, and the first convex surface is in transmission abutment with the guide surface.

[0011] In one of the embodiments, the protruding part further comprises a second convex surface, which is connected between the top surface and the bottom surface along the height direction of the protruding part and protrudes away from the protruding part, the second convex surface has a third edge and a fourth edge along the bending direction of the second convex surface, the third edge is connected with the second edge, and the fourth edge is connected with the bottom surface.

[0012] In one of the embodiments, the protruding part further comprises a first concave surface, which is configured to be concave in the direction towards the interior of the protruding part, the first concave surface has a fifth edge and a sixth edge along the bending direction of the first concave surface, the fifth edge is connected with the second edge, and the sixth edge is connected with the bottom surface.

[0013] In one of the embodiments, the protruding part further comprises a third convex surface and a second concave surface, the second concave surface is located between the third convex surface and the first convex surface, the third convex surface protrudes towards the direction of the first convex surface, the third convex surface has a seventh edge and an eighth edge, the seventh edge is connected with the top surface, and the eighth edge is connected with one side of the second concave surface, and the other side of the second concave surface is connected with the first edge.

[0014] In one of the embodiments, the jacking mechanism further comprises a support part, the support part comprises a support part and the guide rail part, the support part is arranged on both sides of the guide rail part, the support part comprises a third end and a fourth end, the third end is rotationally connected with the cutter head, and the fourth end is rotationally connected with the moving mechanism, when the protruding part of the moving mechanism moves towards the first end or the second end, the support part rotates around the fourth end to drive the cutter head to be raised or lowered relative to the moving mechanism.

[0015] In one of the embodiments, the support part further comprises a transition part, which is located on both sides of the guide rail part and connected between the transition part and the support part, the width of the transition part gradually decreases in the direction of the guide rail part pointing to the support part.

[0016] In one of the embodiments, the mower further comprises a protective cover, which is arranged on the working part and connected with the jacking mechanism, the protective cover is provided with a triggering part and an avoiding part, the triggering part is used to drive the jacking mechanism to be raised relative to the moving mechanism when the protective cover contacts an obstacle, and the avoiding part is used to avoid the obstacle.

[0017] And / or, the guide surface is an arc surface, which is concave in the side away from the moving mechanism.

[0018] In a second aspect, a mower comprises the height adjustment device as described in the first aspect, and further comprises a sensing assembly and a control mechanism, the control mechanism is electrically coupled with the driving mechanism and the sensing assembly, the sensing assembly is configured to generate an electrical signal when the protruding part moves to the first end or the second end, and transmit the electrical signal to the control mechanism, the control mechanism controls the driving mechanism to stop driving the moving mechanism.

[0019] When the driving mechanism drives the moving mechanism to move in a direction intersecting with the height direction of the guide rail part, the protruding part moves along the guide rail part of the jacking mechanism towards the first end of the guide surface, and the protruding part is in transmission abutment with the guide rail part, so that the jacking mechanism drives the working part to be raised relative to the moving mechanism. When the driving mechanism drives the moving mechanism to move away from the jacking mechanism, the protruding part moves towards the second end, and the jacking mechanism drives the working part to be lowered relative to the moving mechanism. When the working part is a cutter head, the mower can adjust the height of the cutter head by the height adjustment device, reduce the collision between the cutter head and the undulating terrain, maintain the normal work of the mower, and protect the mower. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A schematic view of part of the structure of a mower is provided for an embodiment of the present application.

[0021] Figure 2 Another sectional view of part of the structure of a mower is provided for an embodiment of the present application.

[0022] Figure 3 A sectional view of part of the structure of a mower when the protruding part is located at the second end.

[0023] Figure 4 Another sectional view of part of the structure of a mower is provided for an embodiment of the present application.

[0024] Figure 5 A sectional view of part of the structure of a mower when the protruding part is located between the first end and the second end.

[0025] Figure 6 Another sectional view of part of the structure of a mower is provided for an embodiment of the present application.

[0026] Figure 7 A sectional view of part of the structure of a mower when the protruding part is located at the first end.

[0027] Figure 8 A schematic view of part of the structure of a jacking mechanism is provided for an embodiment of the present application.

[0028] Figure 9 A schematic view of the cooperation between a second movable connecting rod and a moving part is provided for an embodiment of the present application.

[0029] Figure 10 Fig. 2 is a structural schematic view of a second movable link in an embodiment of the present application.

[0030] Figure 11 Fig. 3 is a structural schematic view of a moving member in an embodiment of the present application.

[0031] Legend of reference signs:

[0032] 100, mower;

[0033] 1, cutterhead;

[0034] 2, jacking mechanism; 21, guide rail part; 211, guide surface; 211a, first end; 211b, second end; 212, arc-shaped top cover; 213, side wall; 213a, arc edge; 213b, oblique edge; 213c, opening; 221, first movable link; 222, fixed link; 231, second movable link; 233, transition part; 2331, first surface; 2332, first arc surface; 2333, second surface; 2334, third surface; 2335, second arc surface; 2336, fourth surface; 24, elastic member;

[0035] 3, moving mechanism; 301, rotating member; 302, moving member; 31, protruding part; 311, top surface; 312, bottom surface; 313, first convex surface; 313a, first edge; 313b, second edge; 314, second convex surface; 314a, third edge; 314b, fourth edge; 315, first concave surface; 315a, fifth edge; 315b, sixth edge; 316, third convex surface; 316a, seventh edge; 316b, eighth edge; 317, second concave surface; 318, tooth part;

[0036] 4, driving mechanism;

[0037] 5, protective cover; 51, triggering part; 52, avoiding part; 53, protective cover top cover;

[0038] 71, cutterhead support; 72, cutterhead motor; 73, cutterhead coupling. DETAILED DESCRIPTION

[0039] In order to make the above objectives, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0040] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0042] The current mower is difficult to meet the mowing requirements of diversified undulating terrain. If the mower cannot adjust the height of the cutter head to the terrain, the cutter head may collide with the protruding terrain, hinder the work of the mower, and even damage the mower. At present, part of the mower structure drives the cutter head to realize lifting through a complex structure, so that the motor bears a large torque and is easy to be damaged by radial direct impact force, and the complex mechanism for lifting the cutter head is difficult to ensure the stability of the entire mower.

[0043] Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 6 , the present application provides a mower 100, which comprises a height adjusting device for adjusting the height of a working component, a sensing assembly and a control mechanism. The height adjusting device comprises a protective cover 5, a jacking mechanism 2, a moving mechanism 3 and a driving mechanism 4. The working component in the present application is a cutter head 1.

[0044] Please refer to Figures 2 to 7The jacking mechanism 2 is provided with a guide rail part 21, the guide rail part 21 comprises a guide surface 211, along the height direction of the guide rail part 21, the guide surface 211 has a first end 211a and a second end 211b in sequence, and the jacking mechanism 2 is connected with the cutter head 1. The moving mechanism 3 is provided with a protruding part 31, the protruding part 31 is in transmission abutment with the guide surface 211. The driving mechanism 4 is connected with the moving mechanism 3, the driving mechanism 4 is used for driving the moving mechanism 3 to move in the direction intersecting with the height direction of the guide rail part 21, so as to drive the protruding part 31 to move along the guide surface 211 towards the first end 211a or the second end 211b, so that the jacking mechanism 2 is raised or lowered relative to the moving mechanism 3. When the driving mechanism 4 drives the moving mechanism 3 to move towards the jacking mechanism 2, the protruding part 31 moves along the guide rail part 21 of the jacking mechanism 2 towards the first end 211a of the guide surface 211, and since the protruding part 31 is in transmission abutment with the guide rail part 21, the jacking mechanism 2 drives the cutter head 1 to be raised relative to the moving mechanism 3. When the driving mechanism 4 drives the moving mechanism 3 to move away from the jacking mechanism 2, the protruding part 31 moves towards the second end 211b, and the jacking mechanism 2 drives the cutter head 1 to be lowered relative to the moving mechanism 3. Thus, the lawn mower 100 can adjust the height of the cutter head 1, reduce the collision between the cutter head 1 and the undulating terrain, maintain the normal work of the lawn mower 100, and protect the lawn mower 100.

[0045] Please refer to Figure 9 In some embodiments, the guide rail part 21 comprises an arc-shaped top cover 212 and side walls 213 arranged on both sides of the arc-shaped top cover 212. Please refer to Figure 10 The side wall 213 comprises an arc edge 213a and an inclined edge 213b connected with each other, the arc edge 213a is connected with the arc-shaped top cover 212, and the inclined edge 213b forms an opening 213c with the arc-shaped top cover 212 for the transmission abutment of the protruding part 31 on the guide surface 211. The guide rail part 21 is provided with the side wall 213 having the inclined edge 213b, so that the arc length of the arc-shaped top cover 212 can be increased to provide sufficient movement stroke for the movement of the protruding part 31 on the guide surface 211.

[0046] It should be noted that the second end 211b of the guide surface 211 is located on the side of the side wall 213 and the arc-shaped top cover 212 close to the opening 213c, and the first end 211a is located on the side of the side wall 213 and the arc-shaped top cover 213 away from the opening 213c.

[0047] In some embodiments, the guide surface 211 is an arc surface, and the arc surface is arranged concave on the side away from the moving mechanism. Preferably, the guide surface 211 is a circular arc surface, which can provide sufficient transmission force for the abutment transmission of the protruding part 31 to ensure the transmission stability between the guide rail part 21 and the protruding part 31.

[0048] Please refer to Figure 11In some embodiments, the protruding portion 31 comprises opposite top surface 311 and bottom surface 312 along the height direction of the protruding portion 31; the protruding portion 31 further comprises first convex surface 313, the first convex surface 313 protrudes away from the top surface 311, the first convex surface 313 has first edge 313a and second edge 313b along the bending direction of the first convex surface 313, the top surface 311 is connected to the first edge 313a, the bottom surface 312 is connected to the second edge 313b, and the first convex surface 313 abuts against the guide surface 211. The first convex surface 313 protrudes away from the top surface 311, so that the first convex surface 313 contacts the guide surface 211 before other parts of the protruding portion 31, and the first convex surface 313 abuts against the guide surface 211, thereby improving the stability of the lifting control of the cutter head 1. Preferably, the first convex surface 313 is a circular guide surface 211 matched with the guide surface 211, thereby improving the transmission stability.

[0049] In some embodiments, the protruding portion 31 further comprises second convex surface 314, the second convex surface 314 is connected between the top surface 311 and the bottom surface 312 along the height direction of the protruding portion 31, and protrudes away from the protruding portion 31, the second convex surface 314 has third edge 314a and fourth edge 314b along the bending direction of the second convex surface 314, the third edge 314a is connected to the second edge 313b, and the fourth edge 314b is connected to the bottom surface 312. The second convex surface 314 serves as a guide to facilitate the cooperation between the guide surface 211 of the guide rail portion 21 and the first convex surface 313 of the protruding portion 31. In the case where the protruding portion 31 and the guide rail portion 21 are not precisely positioned, the first convex surface 313 of the protruding portion 31 is also facilitated to abut against the guide surface 211 of the guide rail portion 21.

[0050] In some embodiments, the protruding portion 31 further comprises first concave surface 315, the first concave surface 315 is recessed towards the interior of the protruding portion 31, the first concave surface 315 has fifth edge 315a and sixth edge 315b along the bending direction of the first concave surface 315, the fifth edge 315a is connected to the second edge 313b, and the sixth edge 315b is connected to the bottom surface 312. The first concave surface 315 is used to strengthen the abutting stability of the first convex surface 313 and the guide surface 211, and improve the structural stability of the protruding portion 31. If the recess degree of the first concave surface 315 is too large, the first concave surface 315 will contact the guide surface 211 before the first convex surface 313; if the recess degree of the first concave surface 315 is too small, the overall structural strength of the protruding portion 31 will be reduced, which is not conducive to the abutting between the protruding portion 31 and the guide rail portion 21.

[0051] In some embodiments, the protrusion 31 further comprises a third convex surface 316 and a second concave surface 317, the second concave surface 317 is located between the third convex surface 316 and the first convex surface 313, the third convex surface 316 protrudes towards the first convex surface 313, the third convex surface 316 has a seventh side 316a and an eighth side 316b, the seventh side 316a is connected with the top surface 311, the eighth side 316b is connected with one side of the second concave surface 317, and the other side of the second concave surface 317 is connected with the first side 313a. The third convex surface 316 and the second concave surface 317 are used to avoid the protrusion 31 extending into the opening 213c of the guide rail part 21 to scratch the guide surface 211 of the guide rail part 21, and can improve the movement flexibility between the guide rail part 21 and the protrusion 31 and the structural strength of the protrusion 31. Preferably, the third convex surface 316 is a circular arc convex surface, and the second concave surface 317 is a horizontal surface, which can further avoid the sharp corner of the protrusion 31 scratching the guide surface 211 of the guide rail part 21 in the case of misoperation.

[0052] Optionally, the driving mechanism 4 in the embodiments of the present application can be a rotary motor or a rotary cylinder. Please refer to Figure 3 , Figure 5 and Figure 7 The moving mechanism 3 in the embodiments of the present application comprises a rotating member 301 and a moving member 302 connected in transmission, the moving member 302 is provided with the protrusion 31, and the rotating member 301 is connected to the output end of the driving mechanism 4. The driving mechanism 4 is used to drive the rotating member 301 to rotate, so as to drive the moving member 302 to move towards the direction of approaching or moving away from the jacking mechanism 2. The rotating member 301 and the moving member 302 can be a turbine and a worm, or can be a gear and a rack, and other components that can convert rotary motion into linear motion.

[0053] Taking the rotary motor and the gear and rack assembly as an example, the output end of the rotary motor is provided with a gear, please refer to Figure 11 The rack comprises a toothed portion 318 and the protrusion 31, the protrusion 31 is arranged close to the jacking mechanism 2, and the toothed portion 318 is arranged away from the jacking mechanism 2. The gear is engaged with the toothed portion 318 of the rack.

[0054] Please refer to Figure 3 , Figure 5 and Figure 7 Specifically, the rotary motor drives the gear to rotate in the first direction, so as to drive the rack to move in the A direction approaching the jacking mechanism 2, the protrusion 31 extends into the opening 213c of the guide rail part 21, the first convex surface 313 of the protrusion 31 is in transmission abutment with the guide surface 211, the protrusion 31 moves along the guide surface 211 in the direction of the first end 211a, under the action of the protrusion 31, the guide rail part 21 is gradually jacked up by the protrusion 31, the jacking mechanism 2 is gradually lifted, and in turn drives the cutter head 1 to gradually rise.

[0055] The rotating motor driving gear moves in a second direction, which is configured as a direction opposite to the first direction, to drive the rack to move in a B direction away from the jacking mechanism 2, and the protruding part 31 moves in a direction of the second end 211b along the guide surface 211. Under the action of the protruding part 31, the guide rail part 21 gradually descends along the protruding part 31, and the jacking mechanism 2 gradually descends, thereby gradually lowering the cutterhead 1.

[0056] It should be noted that in order to realize the lifting of the cutterhead 1 of the mower 100, very high requirements are put forward for the assembly accuracy of the combined parts. The more the combined parts are increased, the more difficult it is to realize the assembly accuracy. If the protruding part 31 is separated out and a split type roller is used, it is difficult to ensure the coaxiality and machining accuracy of the combined parts such as hole shafts for assembling the roller, which causes a large movement friction between the roller and the combined parts, easily damages the parts, and greatly affects the stability of the mower 100 in lifting the cutterhead 1.

[0057] In the embodiment of the present application, the protruding part 31 is integrally arranged on the moving part 302 of the moving mechanism 3, avoiding the assembly accuracy requirement of the split type. In addition, the protruding part 31 and the guide rail part 21 are used in the embodiment of the present application, the protruding part 31 moves towards the guide rail part 21 to lift the guide rail part 21, and the first convex surface 313 cooperates with the first arc surface 211 to provide the lifting of the cutterhead 1. The relative movement between the first convex surface 313 and the first arc surface 211 is similar to the involute engagement, the sliding is smooth, and the lifting resistance is smaller, so that the cutterhead 1 can be easily and flexibly lifted without using a large power motor, ensuring the service life of the motor and reducing the motor loss.

[0058] In some embodiments, the mower 100 further comprises a sensing assembly and a control mechanism, the control mechanism is electrically coupled with the driving mechanism 4 and the sensing assembly, the sensing assembly is used to generate an electric signal when the protruding part 31 moves to the first end 211a or the second end 211b, and the electric signal is transmitted to the control mechanism, and the control mechanism controls the driving mechanism 4 to stop driving the moving mechanism 3.

[0059] The sensing assembly can be a magnetic sensor, such as a Hall sensor, an anisotropic magnetoresistive sensor, a tunneling magnetoresistive sensor, etc.

[0060] Taking a Hall sensor as an example, the Hall sensor is located in the moving mechanism 3. The Hall sensor includes a first sensor and a second sensor, and a magnet is provided inside the moving part 302. The Hall sensor and the magnet generate a Hall effect to detect the position of the magnet. When the protrusion 31 is located at the first end 211a of the guide rail 21, the position of the magnet corresponds to the first sensor. When the protrusion 31 is located at the second end 211b of the guide rail, the position of the magnet corresponds to the second sensor. Thus, by detecting the position of the magnet through the first and second sensors, it is possible to determine whether the protrusion 31 is located at the first end 211a or the second end 211b and transmit the electrical signal to the control mechanism. The control mechanism then controls the cutter head 1 at its highest and lowest points to prevent the protrusion 31 from moving beyond the first end 211a or the second end 211b, thus playing a limit and safety role.

[0061] In some embodiments, the lifting mechanism 2 further includes a support member, which includes a support portion and a guide rail portion 21. The support portion is located on both sides of the guide rail portion 21 and includes a third end and a fourth end. The third end is rotatably connected to the cutter head 1, and the fourth end is rotatably connected to the moving mechanism 3. When the protrusion 31 of the moving mechanism 3 moves toward the first end 211a or the second end 211b, the support portion rotates around the fourth end to drive the cutter head 1 to rise or fall relative to the moving mechanism 3. Providing a support member on the moving mechanism 3 and the cutter head 1, and having the support member located on both sides of the guide rail portion 21, can improve the structural stability of the lifting mechanism and restrict the movement of the guide rail portion 21, ensuring that the guide rail portion 21 moves only in the lifting direction and does not deviate to the left or right.

[0062] The support system includes an upper support and a lower support, which together form the support portion. Along the height of the lawnmower 100, the upper support is located above the lower support. See also... Figure 8 The upper support includes a pair of first movable links 221 and fixed links 222. (See also...) Figure 9 The lower support includes a pair of second movable links 231 and a transition section 233. First movable links 221 and second movable links 231 are respectively arranged at the top and bottom to form a stable parallelogram structure, which further improves the structural stability of the lifting mechanism 2. At the same time, the first movable links 221 and second movable links 231 have rigidity, and they mutually restrain each other, further preventing the lifting mechanism 2 from tilting left or right.

[0063] Please see Figure 8 The fixed connecting rod 222 is laterally connected between the first movable connecting rods 221 to improve the stability and support strength of the first movable connecting rods 221. Along the length of the first movable connecting rod 221, one end is rotatably connected to the moving mechanism 3, and the other end is rotatably connected to the cutter head 1.

[0064] Please seeFigure 9 The second movable link 231 is located on both sides of the guide rail 21. Along the length of the second movable link 231, one end is rotatably connected to the moving mechanism 3, and the other end is rotatably connected to the cutter head 1. The width of the transition section 233 gradually decreases along the direction from the guide rail 21 to the second movable link 231. Providing the transition section 233 to seamlessly connect the guide rail 21 and the second movable link 231 facilitates force balance in the guide rail 21 and reduces its deformation. Furthermore, the connection between the guide rail 21 and the second movable link 231 conforms to the top-to-bottom assembly sequence of the lawnmower 100, improving space utilization and simplifying the structure of the lifting mechanism 2. Specifically, the first movable link 221 is assembled first, followed by the second movable link 231, and then the moving part 302 of the moving mechanism 3 is assembled, so that the protrusion 31 of the moving part 302 contacts the guide rail 21 on the second movable link 231. If the guide rail 21 is placed on other parts of the lifting mechanism 2, it will increase the structural complexity of the lifting mechanism 2, which will not be conducive to space utilization, make the assembly process more complicated, and reduce production assembly efficiency.

[0065] For further details, please refer to Figure 10 The transition portion 233 is plate-shaped and has a first surface 2331, a first arc surface 2332, a second surface 2333, a third surface 2334, a second arc surface 2335, and a fourth surface 2336 disposed between the guide rail portion 21 and the second movable connecting rod 231. The first surface 2331, the first arc surface 2332, and the second surface 2333 are located on the same side, with the first arc surface 2332 connecting between the first surface 2331 and the second surface 2333. The third surface 2334, the second arc surface 2335, and the fourth surface 2336 are located on the other side, with the second arc surface 2335 connecting between the third surface 2334 and the fourth surface 2336. Furthermore, the width between the first surface 2331 and the fourth surface 2336 is greater than the width between the second surface 2333 and the third surface 2334, which can improve the support strength at the connection between the guide rail portion 21 and the transition portion 233. When the protrusion 31 is located at the first end 211a of the guide rail 21, the interaction force between the protrusion 31 and the guide rail 21 is greater than when the protrusion 31 is located at the second end 211b. The arc length of the first arc surface 2332 near the second end 211b is set to be greater than the arc length of the second arc surface 2335 near the first end 211a, so that the area of ​​the notch formed by the first arc surface 2332 is greater than the area of ​​the notch formed by the second arc surface 2335. This can further balance the forces on the first end 211a and the second end 211b of the guide rail 21, making the lifting mechanism 2 more stable.

[0066] Please see Figure 8The lifting mechanism 2 also includes an elastic element 24, which can be a spring, torsion spring, etc. One end of the elastic element 24 along its own length is connected to the side of the first movable link 221 near the moving mechanism 3, and the other end is connected to the side of the second movable link 231 near the cutter head 1. The elastic element 24 can limit the movement of the first movable link 221 and the second movable link 231, thereby improving the structural stability of the lifting mechanism 2.

[0067] Please see Figure 3 , Figure 5 and Figure 7 In some embodiments, the lawnmower 100 also includes a protective cover 5, which covers the blade disc 1 and is connected to the lifting mechanism 2. The protective cover 5 includes a protective cover top cover 53, and a trigger part 51 and a avoidance part 52 connected to the bottom end of the protective cover top cover 53. The trigger part 51 is used to cause the protective cover 5 to drive the lifting mechanism 2 to rise relative to the moving mechanism 3 when it comes into contact with an obstacle. The avoidance part 52 is used to avoid obstacles such as stones and wooden stakes.

[0068] The circumferential dimension of the protective cover 5 is larger than that of the cutter head 1, and the height of the protective cover 5 is greater than that of the cutter head 1 itself, so as to surround the circumference of the cutter head 1. On the one hand, it prevents external obstacles from damaging the cutter head 1, and on the other hand, it blocks the blades in the event that the blades of the cutter head 1 are accidentally thrown away, thereby improving the working safety of the lawnmower 100.

[0069] The protective cover 5 is connected to the third end of the first movable link 221 and the second movable link 231. When the trigger part 51 collides with an obstacle, the protective cover 5 is forced to lift the first movable link 221 and the second movable link 231 upwards, causing the guide rail part 21 to move relative to the protrusion 31. The first convex surface 313 of the protrusion 31 moves toward the first end 211a of the guide surface 211 of the guide rail part 21, thereby raising the blade disc 1 with the first movable link 221 and the second movable link 231. This ensures that the lawnmower 100 will not be blocked by protruding obstacles when passing over undulating ground.

[0070] The triggering parts 51 are spaced around the circumference of the protective cover body, and the top of the triggering parts 51 is connected to the bottom end of the protective cover body and extends towards the bottom surface 312. The triggering parts 51 are arc-shaped teeth that are wider at the top and narrower at the bottom, which can reduce the impact of collision with obstacles while still being able to touch them.

[0071] The avoidance part 52 and the trigger part 51 are spaced apart on the front and rear sides of the protective cover body. The top of the avoidance part 52 is connected to the protective cover body, and its bottom end extends outward at an angle away from the protective cover body so that obstacles entering from the trigger part 51 can pass through the avoidance part 52, thus preventing obstacles from getting stuck in the gap between the cutter head 1 and the protective cover 5 and affecting the operation of the cutter head 1.

[0072] For further details, please refer to Figure 3 , Figure 5 and Figure 7 In the lawnmower 100 of this embodiment, the lifting mechanism 2 further includes a blade disc bracket 71, a blade disc motor 72, and a blade disc coupling 73. A protective cover 5 is fixed to the bottom end of the blade disc bracket 71. The blade disc bracket 71 has a hollow portion for fixing the blade disc coupling 73, and the output end of the blade disc coupling 73 is connected to the blade disc 1. The first movable connecting rod 221 and the second movable connecting rod 231 are both rotatably connected to the blade disc bracket 71.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A height adjustment device for adjusting the height of a working component, characterized in that, include: A lifting mechanism is provided with a guide rail section, the guide rail section includes a guide surface, and along the height direction of the guide rail section, the guide surface has a first end and a second end in sequence. The lifting mechanism is connected to the working component. A moving mechanism, wherein the moving mechanism is provided with a protrusion, the protrusion being driven to abut against the guide surface; as well as A drive mechanism is connected to the moving mechanism. The drive mechanism is used to drive the moving mechanism to move in a direction intersecting with the height direction of the guide rail, so as to drive the protrusion to move along the guide surface toward the first end or the second end, so as to raise or lower the lifting mechanism relative to the moving mechanism. The guide rail includes an arc-shaped top cover and side walls on both sides of the arc-shaped top cover. The arc-shaped top cover has the guide surface. The side wall includes a connected arc edge and a beveled edge. The arc edge is connected to the arc-shaped top cover. The beveled edge and the arc-shaped top cover form an opening for the protrusion to drive against the guide surface. Along the height direction of the protrusion, the protrusion includes opposing top and bottom surfaces; The protrusion further includes a first convex surface, which protrudes in a direction away from the top surface. The first convex surface has a first side and a second side along its own curvature direction. The top surface is connected to the first side, the bottom surface is connected to the second side, and the first convex surface abuts against the guide surface. The protrusion further includes a second convex surface. Along the height direction of the protrusion, the second convex surface is connected between the top surface and the bottom surface and protrudes in a direction away from the protrusion. The second convex surface has a third side and a fourth side along its own curvature direction. The third side is connected to the second side, and the fourth side is connected to the bottom surface. The protrusion further includes a first concave surface, which is configured to be recessed in a direction toward the interior of the protrusion. The first concave surface has a fifth side and a sixth side along its own curvature direction. The fifth side is connected to the second side, and the sixth side is connected to the bottom surface.

2. The height adjustment device according to claim 1, characterized in that, The protrusion further includes a third convex surface and a second concave surface. The second concave surface is located between the third convex surface and the first convex surface. The third convex surface protrudes toward the first convex surface. The third convex surface has a seventh side and an eighth side. The seventh side is connected to the top surface, the eighth side is connected to one side of the second concave surface, and the other side of the second concave surface is connected to the first side.

3. The height adjustment device according to claim 1, characterized in that, The lifting mechanism further includes a support member, which includes a support portion and a guide rail portion. The support portion is located on both sides of the guide rail portion. The support portion includes a third end and a fourth end. The third end is rotatably connected to the working component, and the fourth end is rotatably connected to the moving mechanism. When the protrusion of the moving mechanism moves toward the first end or the second end, the support portion rotates around the fourth end to drive the working component to rise or fall relative to the moving mechanism.

4. The height adjustment device according to claim 3, characterized in that, The support also includes a transition portion, which is located on both sides of the guide rail and connects the transition portion and the support portion. The width of the transition portion gradually decreases along the direction from the guide rail to the support portion.

5. The height adjustment device according to any one of claims 1 to 4, characterized in that, The height adjustment device also includes a protective cover, which is provided on the working component and connected to the lifting mechanism. The protective cover is provided with a triggering part and a avoidance part. The triggering part is used to cause the protective cover to raise the lifting mechanism relative to the moving mechanism when it comes into contact with an obstacle. The avoidance part is used to avoid the obstacle. And / or, the guide surface is an arc surface, and the arc surface is recessed along the side opposite to the moving mechanism.

6. A lawnmower, characterized in that, Including the height adjustment device as described in any one of claims 1 to 5, the lawnmower further includes a sensing component and a control mechanism, the control mechanism being electrically connected to the drive mechanism and the sensing component respectively, the sensing component being used to generate an electrical signal when the protrusion moves to the first end or the second end, and to transmit the electrical signal to the control mechanism, the control mechanism controlling the drive mechanism to stop driving the moving mechanism.

Images