Electric height adjustment device and lawnmower

Abstract

The application belongs to the technical field of mowers and relates to an electric height adjusting device and a mower. The electric height adjusting device comprises a support, which is hollow inside; a cutting frame, which is arranged in the support and can make reciprocating linear motion in a direction perpendicular to a working plane, and is used for bearing a cutting prime mover; a driving assembly, which comprises an electric driving unit fixed on the support, a second transmission structure connected with the cutting frame, and a first transmission structure connected between the electric driving unit and the second transmission structure, the first transmission structure comprising a worm and a worm wheel matched with each other, the worm being connected with an output end of the electric driving unit, the worm wheel being connected with the second transmission structure, and the second transmission structure being used for converting the rotary motion of the worm wheel into the linear motion of the cutting frame; and the ground clearance of the cutting prime mover can be adjusted through the driving assembly. The application can adjust the cutting height without close manual operation, facilitates the improvement of the automation of the mower, and is beneficial to the realization of remote operation.

Description

Technical Field

[0001] This invention relates to the field of lawn mowing technology, and more particularly to an electric height adjustment device and a lawn mower. Background Technology

[0002] A lawnmower is a mechanical tool used to trim lawns, vegetation, etc., effectively improving the weeding efficiency of workers and reducing their labor intensity. However, different users have different requirements for lawn height. Therefore, lawnmowers with adjustable mowing heights have appeared on the market, allowing users to freely choose the mowing height and thus control the height of the lawn after trimming.

[0003] However, most existing lawnmowers rely on manual adjustment of their cutting height. Users rotate a height adjustment knob on the lawnmower, which, through a gear pair, enables the linear movement of the cutting motor. This method has several drawbacks: firstly, the cutting height range is small (20-60mm), and manual adjustment is required; secondly, it is not conducive to long-distance height adjustment of the lawnmower. Summary of the Invention

[0004] In view of this, the main objective of the present invention is to provide a height adjustment device and a cutting machine to solve the problem that the height adjustment of lawn mowers in the prior art requires manual adjustment.

[0005] To achieve the above and other related objectives, the present invention provides an electrically adjustable height device, comprising:

[0006] The support is provided with a receiving cavity;

[0007] The cutting frame is set in the receiving cavity of the support and can reciprocate linearly in a direction perpendicular to the working plane, and is used to support the cutting prime mover;

[0008] The drive assembly includes an electric drive unit fixed on the support, a second transmission structure connected to the cutting frame, and a first transmission structure connected between the electric drive unit and the second transmission structure. The first transmission structure includes a cooperating worm and a worm wheel. The worm is connected to the output end of the electric drive unit, and the worm wheel is connected to the second transmission structure. The second transmission structure is used to convert the rotational motion of the worm wheel into linear motion of the cutting frame along a direction perpendicular to the working plane. The drive assembly allows adjustment of the ground clearance of the cutting prime mover.

[0009] The basic principle of the electric height adjustment device is as follows: the rotational motion of the electric drive unit is transmitted to the second transmission structure through the first transmission structure equipped with a worm gear, and then the rotational motion is switched to the linear motion of the cutting frame through the second transmission structure. Since the cutting frame carries the cutting prime mover, the height of the prime mover can be adjusted by adjusting the height of the cutting frame from the ground, thus realizing the height adjustment of the prime mover by relying on the drive component.

[0010] The present invention also provides a lawnmower, comprising:

[0011] chassis;

[0012] An electric height adjustment device, mounted on the machine housing, is used to adjust the ground clearance of the cutting prime mover.

[0013] The cutting assembly, connected to the cutting prime mover, is used to perform the cutting operation;

[0014] The walking assembly is located at the bottom of the casing; and

[0015] A control component for controlling the operation of the electric height adjustment device.

[0016] The electric height adjustment device includes:

[0017] The support is provided with a receiving cavity;

[0018] The cutting frame is set in the receiving cavity of the support and can reciprocate linearly in a direction perpendicular to the working plane, and is used to support the cutting prime mover;

[0019] The drive assembly includes an electric drive unit fixed on the support, a second transmission structure connected to the cutting frame, and a first transmission structure connected between the electric drive unit and the second transmission structure. The first transmission structure includes a cooperating worm and a worm wheel. The worm is connected to the output end of the electric drive unit, and the worm wheel is connected to the second transmission structure. The second transmission structure is used to convert the rotational motion of the worm wheel into linear motion of the cutting frame along a direction perpendicular to the working plane. The drive assembly allows adjustment of the ground clearance of the cutting prime mover.

[0020] As described above, the present invention has the following beneficial effects:

[0021] The rotational power of the electric drive unit is converted into linear motion of the cutting frame through the first and second transmission structures, thereby adjusting the height of the cutting frame off the ground. The height adjustment of the cutting prime mover can be achieved by relying on the electric drive unit, eliminating the need for manual close-range operation to adjust the cutting height. This facilitates the automation of the lawnmower and also enables remote operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of this aspect;

[0024] Figure 3 This is a schematic diagram of the support structure according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the cross-section of the support portion according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the drive assembly and cutting frame according to an embodiment of the present invention;

[0027] Figure 6 This is an exploded view of a linearly moving component according to an embodiment of the present invention;

[0028] Figure 7 for Figure 6 Enlarged view at point I;

[0029] Figure 8 This is a schematic diagram of the structure of the second damping element according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the support structure according to an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the support plate structure according to an embodiment of the present invention.

[0032] Figure 11 This is a schematic diagram showing the positional relationship between the signal trigger bar and the first and second sensors according to an embodiment of the present invention.

[0033] Figure 12 When the cutting machine frame moves upwards... Figure 11 A schematic diagram of the signals collected by the two primary sensors.

[0034] Figure 13 When the cutting machine frame descends, Figure 11 Schematic diagram of signals collected by the two first sensors. Part number description.

[0035] 100-Support; 110-Base; 120-Accommodating cylinder; 121-Accommodating cavity; 122-Positioning groove; 123-Allowing groove; 120a-Upper cylinder; 120b-Lower cylinder; 130-Sensor bracket; 131-First sensor; 132-Second sensor;

[0036] 200 - Cutting frame; 210 - Frame body; 220 - Signal trigger strip; 221 - Second cutout area; 222 - Obstruction area; 223 - First cutout area;

[0037] 300 - Drive assembly; 310 - Electric drive unit;

[0038] 320 - First transmission structure; 321 - Worm gear; 322 - Worm wheel;

[0039] 330 - Second transmission structure; 331 - Transmission rod; 332 - Linear motion component; 3321 - Mounting base; 3321a - Positioning hole; 3322 - Screw sleeve; 3322a - Screw hole; 3322b - Flange; 3323 - Snap ring;

[0040] 400 - standing seat;

[0041] 500 - Second damping element; 510 - Arched portion; 520 - First hook portion; 530 - Second hook portion;

[0042] 600 - Sealed Shield;

[0043] 700 - Cutting prime mover;

[0044] 800-Support guard plate;

[0045] 900 - Fixed ring. Detailed Implementation

[0046] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0047] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0048] Please refer to the above. Figure 1 , Figure 2 , Figure 3 and Figure 5 The present invention provides an electric height adjustment device, comprising:

[0049] Support 100, provided with receiving cavity 121;

[0050] The cutting frame 200 is disposed in the receiving cavity 121 of the support 100 and can reciprocate linearly in a direction perpendicular to the working plane, and is used to support the cutting prime mover 700.

[0051] The drive assembly 300 includes an electric drive unit 310 fixed on the support 100, a second transmission structure 330 connected to the cutting frame 200, and a first transmission structure 320 connected between the electric drive unit 310 and the second transmission structure 330. The first transmission structure 320 includes a cooperating worm 321 and a worm wheel 322. The worm 321 is connected to the output end of the electric drive unit 310, and the worm wheel 322 is connected to the second transmission structure 330. The second transmission structure 330 is used to convert the rotational motion of the worm wheel 322 into linear motion of the cutting frame 200 along a direction perpendicular to the working plane. The drive assembly 300 can adjust the ground clearance of the cutting prime mover 700.

[0052] See Figure 5 and Figure 6 In some embodiments of the present invention, the second transmission structure 330 includes a transmission rod 331 connected to the worm gear 322 and a linear motion component 332 fixed on the cutting frame 200. The linear motion component 332 is provided with a threaded hole 3322a, and the transmission rod 331 passes through the threaded hole 3322a and is threadedly engaged with the threaded hole 3322a. The electric drive unit 310 may specifically be a drive motor.

[0053] See Figure 5 In some embodiments of the present invention, the worm gear 322 is coaxially sleeved on the transmission rod 331, and the rotation axes of the transmission rod 331 and the worm gear 322 are in the vertical direction, while the rotation axis of the worm 321 is in the horizontal direction.

[0054] See also Figure 1 , Figure 5 In some embodiments of the present invention, a stand 400 is provided on the support 100, the electric drive unit 310 and the worm gear 321 are both disposed on the support 100, one end of the transmission rod 331 is connected to the support 100, and the other end of the transmission rod 331 is connected to the stand 400. The worm gear 322 is located below the linear motion component 332. In this structure, the center of gravity of the electric drive unit 310 and the first transmission structure 320 is closer to the support 100, which helps to lower the center of gravity of the entire height adjustment structure, and thus facilitates stable mowing operations.

[0055] See also Figure 2 and Figure 4In some embodiments of the present invention, the support 100 includes a base 110 and a receiving cylinder 120, and the cutting frame 200 is disposed within the receiving cylinder 120. The receiving cylinder 120 includes an upper cylinder 120a and a lower cylinder 120b, with the upper cylinder 120a positioned above the base 110 and the lower cylinder 120b positioned below the base 110. Compared to directly placing the entire receiving cylinder 120 above the support 110, this structure results in a lower center of gravity, which facilitates more stable mowing operations.

[0056] See also Figure 1 , Figure 9 In some embodiments of the present invention, the support 400 includes a base plate 410 disposed on the support 100, a top plate 430 disposed above the base plate 410, and a connecting arc plate 420 connecting the base plate 410 and the top plate 430. The base plate 410 is semi-annular, and a bearing seat 440 is disposed on the top plate 430. The upper end of the transmission rod 331 is positioned in the bearing seat 440 by a first bearing, and the lower end of the transmission rod 331 passes through the base plate 410 and is positioned on the support 100 by a second bearing.

[0057] Optional, see below Figure 9 The support 400 also includes a protective annular plate 450, which is disposed on the connecting arc plate 420; and the protective annular plate 450 is located above the bottom plate 410 and below the top plate 430, so that the protective annular plate 450, the bottom plate 410 and the connecting arc plate 420 together form a protective space for protecting the worm gear 322. Figure 9 The stand 400 also includes reinforcing ribs, which can enhance the mechanical properties of the stand 400.

[0058] See Figure 6 As shown, in some embodiments of the present invention, the linear motion component 332 includes a mounting base 3321 fixedly connected to the cutting frame 200 and a detachable threaded sleeve 3322 disposed on the mounting base 3321, wherein the inner hole of the threaded sleeve 3322 is the threaded hole 3322a. With this structure, if the threaded hole 3322a of the threaded sleeve 3322 is excessively worn, the threaded sleeve 3322 can be directly replaced without replacing the entire linear motion component 332, and even less so the cutting frame 200 connected to the linear motion component 332, thus reducing maintenance costs.

[0059] See Figure 6As shown, in some embodiments of the present invention, the mounting base 3321 is provided with a positioning hole 3321a, the threaded sleeve 3322 is disposed in the positioning hole 3321a, and the outer wall of the threaded sleeve 3322 and the inner wall of the positioning hole 3321a are engaged by an anti-rotation structure, which restricts the threaded sleeve 3322 from rotating relative to the mounting base 3321.

[0060] Optional, see below Figure 6 As shown, the anti-rotation structure has a hexagonal cross-sectional profile, meaning the positioning hole 3321a has a hexagonal cross-section, and the threaded sleeve 3322 has a hexagonal cross-sectional profile that matches the positioning hole 3321a. In actual implementation, the cross-section of the anti-rotation structure can also be any number of polygons; of course, the cross-sectional profiles of the threaded sleeve and the positioning hole can also be circular. To limit the rotation of the threaded sleeve relative to the mounting base, the threaded sleeve and the positioning hole can be fitted with an interference fit, or a key or other connecting component can be provided between the threaded sleeve and the positioning hole.

[0061] See also Figure 5 , Figure 6 In some embodiments of the present invention, the two ends of the threaded sleeve 3322 are respectively provided with a first limiting member 3322b and a second limiting member 3323 for limiting the axial position of the threaded sleeve 3322 relative to the mounting base 3321. The first limiting member 3322b abuts against the outside of the first end of the mounting base 3321, and the second limiting member 3323 abuts against the outside of the second end of the mounting base 3321. Figure 6 In the middle, the first end is the upper end of the mounting base 3221, and the second end is the lower end of the mounting base 3321.

[0062] Optional, see below Figure 6 As shown, the first limiting component 3322b is an outer flange provided on the threaded sleeve 3322, and the second limiting component 3323 is a detachable retaining ring provided on the threaded sleeve 3322. When disassembling the threaded sleeve 3322, only the retaining ring needs to be removed to remove the threaded sleeve 3322 from the mounting part 3321.

[0063] Optionally, a first damping element (not shown) is provided between the inner wall of the positioning hole (3321a) and the outer wall of the threaded sleeve (3322). For example, the first damping element can be a rubber sleeve, which fits around the threaded sleeve (3322) and matches the internal contour of the positioning hole (3321a); ​​or, for example, the first damping element can be multiple rubber sheets. When the threaded sleeve 3322 has a polygonal cross-sectional contour, the rubber sheets are bonded to each of the outer walls of the threaded sleeve (3322). When the threaded sleeve (3322) is installed in the positioning hole (3321a), the rubber sheets are located between the inner wall of the positioning hole (3321a) and the outer wall of the threaded sleeve (3322).

[0064] See Figure 1 , Figure 2 As shown, in some embodiments of the present invention, the electric height adjustment device further includes a second damping element 500 disposed between the cutting frame 200 and the support 100. The second damping element 500 is engaged on the support 100 and can slide relative to the outer wall of the cutting frame 200. By providing the second damping element 500 on the support 100, the cutting frame 200 can reciprocate linearly relative to the second damping element 500. The elasticity of the second damping element 500 ensures smooth movement of the cutting frame 200 during reciprocating motion, thus absorbing and damping shocks.

[0065] See also Figure 1 , Figure 2 and Figure 3 In some embodiments of the present invention, a plurality of positioning grooves 122 are provided on the cavity wall of the receiving cavity 121, and the second shock-absorbing element 500 is disposed in the positioning groove 122.

[0066] In some embodiments of the present invention, see Figure 3 As shown, the positioning groove 122 is a strip-shaped groove, see reference. Figure 8 As shown, the second damping element 500 is a strip spring sheet, and the second damping element 500 has at least one arched portion 510 along its length.

[0067] Optional, see below Figure 8 There are two arched portions 510, with a smooth transition between them. At this time, the arched top areas of the two arched portions 510 are in contact with the outer wall of the cutting frame 200. In actual implementation, one or more arched portions 510 may also be provided.

[0068] In some embodiments of the present invention, in conjunction with reference to [reference] Figure 2 , Figure 8The support 100 includes a base 110 and a housing cylinder 120. The cutting frame 200 is disposed within the housing cylinder 120. One end of the second damping element 500 is bent to form a first hook 520, and the other end of the second damping element 500 is bent to form a second hook 530. The first hook 520 hooks onto the edge of one end of the housing cylinder 120, and the second hook 530 hooks onto the edge of the other end of the housing cylinder 120. In this structure, the second damping element 500 can be positioned on the support 100 without the need for additional parts.

[0069] Accordingly, refer to Figure 3 The length direction of the positioning groove 122 is approximately parallel to the axial direction of the accommodating cylinder 120, so that the length direction of the second damping element 500 is approximately consistent with the axial direction of the accommodating cylinder 120, thereby reducing the resistance of the cutting frame 200 to linear motion relative to the second damping element 500.

[0070] In actual implementation, the positioning groove can also be an annular groove or an arc-shaped groove provided on the wall of the receiving cavity; when the positioning groove is an annular groove, the second damping element is a corresponding annular spring sheet, which includes multiple arched parts along the circumferential direction, and the arched top area of ​​each arched part contacts the outer wall of the cutting frame 200; when the positioning groove is an arc-shaped groove, the long side of the arc-shaped groove is along the circumferential direction of the receiving cylinder 120, and the second damping element is a corresponding arc-shaped spring sheet, which also includes at least one arched part along the circumferential direction, and the arched top area of ​​the arched part contacts the outer wall of the cutting frame 200.

[0071] In some embodiments of the present invention, a plurality of second damping elements 500 are provided and arranged at intervals along the circumference of the cutting frame 200. In this embodiment, three second damping elements 500 are arranged along the circumference of the cutting frame 200.

[0072] In some embodiments of the present invention, see Figure 11 The electric height adjustment device further includes a measuring structure for sensing the height adjustment of the cutting frame 200. The measuring structure includes a signal triggering part 220 and at least two first sensors 132. The signal triggering part 220 is provided with a plurality of hollow areas 221 and a plurality of blocking areas 222. The hollow areas 221 and blocking areas 222 are alternately distributed along the height direction. The first sensors 132 are used to sense the hollow areas 221 and the blocking areas 222. The first sensors 132 are spaced apart along the height direction. The signals collected by at least two first sensors 132 have a phase difference. The height direction is the lifting direction of the cutting frame 200.

[0073] When the height is adjusted, the signal waveforms obtained by the two first sensors are essentially the same, but the phases between them are different. The direction of movement of the cutting frame can be determined based on the positive or negative value of the phase difference between the two sensors.

[0074] Compared to the method of measuring and adjusting height using a single sensor, this measurement structure can determine the movement direction of the cutter frame 200 by combining the signals collected by each first sensor.

[0075] Furthermore, if a single sensor is used to measure the height adjustment, when the sensor stops near the boundary between the obstruction area 222 and the cutout area 221, the sensor may vibrate slightly during the cutting process. Therefore, the data collected by a single sensor cannot determine whether the sensor is located in the obstruction area 222 or the cutout area 221, resulting in low measurement accuracy. However, if at least two first sensors are used to measure the height adjustment, when one of the first sensors is near the boundary between the obstruction area 220 and the cutout area 221, the current height adjustment position can be determined based on the other first sensor. Compared to the method of collecting signals using a single sensor, the method of collecting signals using at least two first sensors in this embodiment can achieve noise reduction and has higher measurement accuracy.

[0076] In some embodiments of the present invention, there are two first sensors 132. The dimensions of both the hollow area 221 and the obstruction area 222 in the height direction are 1 / 2h, where h is the sum of the dimensions of one hollow area 221 and one obstruction area 222 in the height direction. The distance between the two first sensors 132 in the height direction is equal to nh + 1 / 4h, where n is a natural number. In this case, the height data acquired by the two sensors will have an error of at most 1 / 4h.

[0077] If the signal triggering unit 220 is disposed on the cutting frame 210 and each of the first sensors 132 is disposed on the support 100, then... Figure 11 In the diagram, the first sensor positioned slightly upwards in the view direction is defined as sensor a, and the first sensor 132 positioned slightly downwards is defined as sensor b. When the cutting frame 210 moves upwards, the signal waveforms collected by sensors a and b are shown in the diagram. Figure 12 When the cutting frame 220 descends, the signal waveforms collected by sensors a and b are shown in the figure. Figure 13 .

[0078] Optional, see also Figure 2 , Figure 6 , Figure 7 and Figure 11The cutting frame 200 includes a frame body 210, and the signal triggering unit 220 is disposed on the frame body 210 and can move linearly with the cutting frame 200; each of the first sensors 132 is disposed on the support 100.

[0079] Optionally, both the first sensor 131 and the second sensor 132 are through-beam photoelectric sensors.

[0080] Optional, see below Figure 4 As shown, a sensor bracket 130 is provided on the support 100, and both the signal transmitter and the signal receiver are provided on the sensor bracket 130.

[0081] See also Figure 1 , Figure 3 , Figure 6 In some embodiments of the present invention, the inner wall of the receiving cavity 121 is provided with a relief groove 123, and the signal trigger bar 220 is disposed in the relief groove 123.

[0082] See also Figure 5 , Figure 11 The support 100 is equipped with a second sensor 131 for sensing the height adjustment limit position. In actual implementation, the height adjustment limit position typically includes a maximum limit position and a minimum limit position. These limit positions can be alternating positions of openwork and obstruction, and the alternating positions avoid the aforementioned openwork area 221 and obstruction area 222. For example, see [reference needed]. Figure 11 The area between the highest and lowest limit positions is open, but the area above the highest limit position and below the lowest limit position is not open.

[0083] See Figure 2 As shown, in some embodiments of the present invention, a sealing cover 600 is connected between the bottom of the cutting frame 200 and the support 100. The sealing cover 600 has multiple interconnected folding sections. When the cutting frame 200 performs reciprocating linear motion, the sealing cover 600 extends or retracts. The bottom of the sealing cover 600 has a bottom hole for the output end of the cutting prime mover 700 to extend. The sealing cover 600 provides dust and water protection for the cutting frame 200. Furthermore, the sealing cover 600 can not only extend and retract in the vertical direction (the direction of movement of the cutting frame), but also provides shock absorption in the horizontal direction.

[0084] See Figure 2As shown, in some embodiments of the present invention, the bottom of the support 100 is provided with a support plate 800 for supporting the support 100, and the sealing cover 600 is disposed between the bottom of the support plate 800 and the cutting frame 200. The support plate 800 and the sealing cover 600 can block splashed dirt, water droplets and other impurities, and provide protection for the support 100, the cutting frame 200 and the drive assembly 300.

[0085] See also Figure 2 , Figure 4 , Figure 10 In some embodiments of the present invention, a through hole 801 is provided on the support plate 800, and the lower cylinder 120b passes through the through hole 801.

[0086] See Figure 2 As shown, in some embodiments of the present invention, the outer dimension of the end of the sealing cover 600 connected to the bottom of the support plate 800 is larger than the outer dimension of the end connected to the bottom of the cutting machine frame 200, and the sealing cover 600 is frustum-shaped.

[0087] See Figure 2 In some embodiments of the present invention, the upper end of the sealing cover 600 is pressed against the bottom surface of the support plate 800 by a fixing ring 900, the lower end of the sealing cover 600 is connected to the lower part of the cutting frame 200, and the fixing ring 900 is installed at the bottom of the support plate 800 by bolts.

[0088] The invention also provides a lawnmower, comprising:

[0089] chassis;

[0090] An electric height adjustment device, installed on the machine housing, is used to adjust the ground clearance of the cutting prime mover 700;

[0091] The cutting assembly, connected to the cutting prime mover 700, is used to perform the cutting operation;

[0092] The walking assembly is located at the bottom of the casing;

[0093] Control components are used to control the operation of the electric height adjustment device;

[0094] The electric height adjustment device includes:

[0095] The electric height adjustment device includes:

[0096] Support 100, provided with receiving cavity 121;

[0097] The cutting frame 200 is disposed in the receiving cavity 121 of the support 100 and can reciprocate linearly in a direction perpendicular to the working plane, and is used to support the cutting prime mover 700.

[0098] The drive assembly 300 includes an electric drive unit 310 fixed on the support 100, a second transmission structure 330 connected to the cutting frame 200, and a first transmission structure 320 connected between the electric drive unit 310 and the second transmission structure 330. The first transmission structure 320 includes a cooperating worm 321 and a worm wheel 322. The worm 321 is connected to the output end of the electric drive unit 310, and the worm wheel 322 is connected to the second transmission structure 330. The second transmission structure 330 is used to convert the rotational motion of the worm wheel 322 into linear motion of the cutting frame 200 along a direction perpendicular to the working plane. The drive assembly 300 can adjust the ground clearance of the cutting prime mover 700.

[0099] In some embodiments of the present invention, the walking assembly includes at least three movable wheels mounted on the housing to facilitate the movement of the lawnmower, and the walking assembly also includes a motor for driving the movable wheels to rotate.

[0100] In some embodiments of the present invention, the cutting assembly includes a cutting disc and a plurality of cutting blades mounted on the cutting disc. The cutting blades are evenly distributed along the circumference of the cutting disc. The cutting assembly is driven to move by a cutting prime mover 700 to perform the cutting operation. Since the output end of the cutting prime mover 700 is connected to the cutting assembly, the height of the cutting prime mover 700 above the ground can be adjusted by adjusting the height of the cutting frame 200 using an electric height adjustment device, thereby achieving adjustment of the height of the cutting assembly above the ground.

[0101] Depending on the user's different needs, the electric height adjustment device is controlled by a control component to adjust the cutting height. Specifically, the electric drive unit 310 is controlled by an electronic control system to adjust the ground clearance of the cutting prime mover 700. This can be achieved via remote control or through the device's built-in electronic control panel.

[0102] In summary, in the electric height adjustment device and lawnmower provided in the embodiments of the present invention, the rotational power of the electric drive unit 310 is converted into the linear motion of the cutting frame 200 through the first transmission structure 320 and the second transmission structure 330, thereby adjusting the height of the cutting frame 200 off the ground. The height adjustment of the cutting prime mover 700 can be achieved by controlling the electric drive unit 310, without the need for manual close-range operation to adjust the cutting height, which facilitates the automation of the lawnmower and also enables remote operation.

[0103] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An electric height adjustment device, characterized in that, include: The support (100) is provided with a receiving cavity (121); The cutting frame (200) is disposed in the receiving cavity (121) of the support (100) and can reciprocate linearly in a direction perpendicular to the working plane, and is used to support the cutting prime mover (700). The drive assembly (300) includes an electric drive unit (310) fixed on the support (100), a second transmission structure (330) connected to the cutting frame (200), and a first transmission structure (320) connected between the electric drive unit (310) and the second transmission structure (330). The first transmission structure (320) includes a cooperating worm (321) and a worm wheel (322). The worm (321) is connected to the output end of the electric drive unit (310), and the worm wheel (322) is connected to the second transmission structure (330). The second transmission structure (330) is used to convert the rotational motion of the worm wheel (322) into linear motion of the cutting frame (200) in a direction perpendicular to the working plane. The ground clearance of the cutting prime mover (700) can be adjusted via the drive assembly (300); It also includes a measuring structure for adjusting the height of the induction cutting frame (200), the measuring structure comprising: The signal triggering part (220) is provided with a plurality of hollow areas (221) and a plurality of blocking areas (222). The hollow areas (221) and blocking areas (222) are alternately distributed along the height direction, which is the lifting direction of the cutting frame (200). and At least two first sensors (132) are used to sense the hollow area (221) and the occluded area (222), and each first sensor (132) is spaced apart along the height direction, and the signals collected by at least two first sensors (132) have a phase difference.

2. The electric height adjustment device according to claim 1, characterized in that: The second transmission structure (330) includes a transmission rod (331) connected to the worm gear (322) and a linear motion component (332) fixed on the cutting frame (200). The linear motion component (332) is provided with a screw hole (3322a). The transmission rod (331) passes through the screw hole (3322a) and is threadedly engaged with the screw hole (3322a).

3. The electric height adjustment device according to claim 2, characterized in that: The worm gear (322) is coaxially sleeved on the transmission rod (331), and the rotation axes of the transmission rod (331) and the worm gear (322) are vertical, while the rotation axis of the worm (321) is horizontal.

4. The electric height adjustment device according to claim 2, characterized in that: A stand (400) is provided on the support (100). The electric drive unit (310) and the worm gear (321) are both provided on the support (100). One end of the transmission rod (331) is connected to the support (100), and the other end of the transmission rod (331) is connected to the stand (400). The worm wheel (322) is located below the linear motion component (332).

5. The electric height adjustment device according to claim 3, characterized in that: The linear motion component (332) includes a mounting base (3321) fixedly connected to the cutting frame (200) and a detachable threaded sleeve (3322) disposed on the mounting base (3321), the inner hole of the threaded sleeve (3322) being the threaded hole (3322a).

6. The electric height adjustment device according to claim 5, characterized in that: The mounting base (3321) is provided with a positioning hole (3321a), and the threaded sleeve (3322) is disposed in the positioning hole (3321a). The outer wall of the threaded sleeve (3322) and the inner wall of the positioning hole (3321a) are engaged by an anti-rotation structure, which restricts the threaded sleeve (3322) from rotating relative to the mounting base (3321).

7. The electric height adjustment device according to claim 6, characterized in that: The threaded sleeve (3322) is provided with a first limiting component (3322b) and a second limiting component (3323) at both ends for limiting the axial position of the threaded sleeve (3322) relative to the mounting base (3321). The first limiting component (3322b) abuts against the outside of the first end of the mounting base (3321), and the second limiting component (3323) abuts against the outside of the second end of the mounting base (3321).

8. The electric height adjustment device according to claim 6, characterized in that: A first damping element is provided between the inner wall of the positioning hole (3321a) and the outer wall of the threaded sleeve (3322).

9. The electric height adjustment device according to claim 1, characterized in that: The electric height adjustment device also includes a second shock-absorbing element (500) disposed between the cutting frame (200) and the support (100). The second shock-absorbing element (500) is engaged on the support (100) and can slide relative to the outer wall of the cutting frame (200).

10. The electric height adjustment device according to claim 9, characterized in that: The cavity wall of the receiving cavity (121) is provided with a plurality of positioning grooves (122), and the second shock-absorbing element (500) is disposed in the positioning grooves (122).

11. The electric height adjustment device according to claim 10, characterized in that: The positioning groove (122) is a strip groove, the second damping element (500) is a strip spring sheet, and the second damping element (500) is provided with at least one arched part (510) along the length direction.

12. The electric height adjustment device according to claim 11, characterized in that: There are two arched portions (510), and the two arched portions (510) are smoothly transitioned between each other.

13. The electric height adjustment device according to claim 11, characterized in that: The support (100) includes a base (110) and a housing cylinder (120). The cutting frame (200) is disposed inside the housing cylinder (120). One end of the second damping element (500) is bent to form a first hook (520), and the other end of the second damping element (500) is bent to form a second hook (530). The first hook (520) is hooked on the edge of one end of the housing cylinder (120), and the second hook (530) is hooked on the edge of the other end of the housing cylinder (120).

14. The electric height adjustment device according to claim 9, characterized in that: The second damping element (500) is configured as a plurality of elements and is arranged at circumferential intervals along the cutting frame (200).

15. The electric height adjustment device according to claim 1, characterized in that: There are two first sensors (132). The dimensions of the hollow area (221) and the occluded area (222) in the height direction are both 1 / 2h. The distance between the two first sensors (132) in the height direction is equal to nh+1 / 4h, where n is a natural number.

16. The electric height adjustment device according to claim 1, characterized in that: The cutting frame (200) includes a frame body (210), the signal triggering unit (220) is disposed on the frame body (210) and can move linearly with the cutting frame (200); each of the first sensors (132) is disposed on the support (100).

17. The electric height adjustment device according to claim 1, characterized in that: The inner wall of the receiving cavity (121) is provided with a relief groove (123), and the signal triggering part (220) is disposed in the relief groove (123).

18. The electric height adjustment device according to claim 1, characterized in that: The support (100) is provided with a second sensor (131) for sensing the height limit position.

19. The electric height adjustment device according to claim 1, characterized in that: A sealing cover (600) is connected between the bottom of the cutting frame (200) and the support (100). The sealing cover (600) is provided with multiple connected folding sections. When the cutting frame (200) makes a reciprocating linear motion, the sealing cover (600) extends or retracts.

20. The electric height adjustment device according to claim 19, characterized in that: The bottom of the support (100) is provided with a support plate (800) for supporting the support (100). The upper end of the sealing cover (600) is pressed against the bottom surface of the support plate (800) by a fixing ring (900). The lower end of the sealing cover (600) is connected to the lower part of the cutting frame (200).

21. A lawnmower, characterized in that, include: chassis; An electric height adjustment device, installed on the housing, is used to adjust the ground clearance of the cutting prime mover (700), wherein the electric height adjustment device is the electric height adjustment device according to any one of claims 1 to 20; A cutting assembly, connected to a cutting prime mover (700), is used to perform cutting operations; The walking assembly is located at the bottom of the casing; and A control component for controlling the operation of the electric height adjustment device.

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