Height adjustment structure and lawnmower

Abstract

The utility model discloses a height adjusting structure and mower relates to mower technical field, wherein, height adjusting structure includes fixed frame, movable frame, two swing frame, the first transmission part of fixed frame, the second transmission part of fixedly being arranged in fixed frame, the convex portion of being convex in swing frame, first transmission part is equipped with the receiving portion, first transmission part, second transmission part is equipped with second transmission part, at least one of first transmission part, second transmission part is configured with spiral surface, and the other is abutted with spiral surface, wherein the receiving portion and the convex portion can be abutted and set between; when rotating first transmission part, spiral surface can make first transmission part slide relative to second transmission part, and make first transmission part ascend or descend, and first transmission part drives swing frame to swing up and down around the hinged place of its and fixed frame through convex portion. The technical scheme provided by the utility model can solve the problem that the height of cutter head structure is inconvenient to adjust in mower.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, and in particular to a height-adjustable structure and a lawnmower. Background Technology

[0002] A lawnmower is a type of gardening machinery that typically has a blade disc structure. To meet the user's needs for mowing height, the height of the blade disc structure is adjusted to ensure that the lawn height is consistent after each mowing.

[0003] Existing lawnmowers have the following problems:

[0004] 1. It is inconvenient to adjust the height of the blade structure. For example, existing lawnmowers adjust the height of the blade structure by adjusting multiple wheels to adjust the chassis. However, adjusting multiple wheels to adjust the height of the blade structure involves adjusting each wheel separately, which results in many operation steps and inconvenience for adjustment.

[0005] 2. The height of the cutter head structure cannot be adjusted according to the user's specifications;

[0006] 3. Weeds can easily get into the transmission area of ​​the height adjustment mechanism of the lawnmower. Weeds increase friction in the transmission area, causing it to wear out faster. Utility Model Content

[0007] In order to solve at least one of the above-mentioned technical problems, the purpose of this utility model is to provide a height-adjustable structure and a lawnmower.

[0008] To achieve the above objectives, the height adjustment structure proposed in this utility model includes:

[0009] The frame assembly includes a fixed frame, a movable frame, and two swing frames, wherein the movable frame is arranged opposite to the fixed frame, and the two swing frames are arranged opposite to each other. Each swing frame has a first end and a second end. The first end is rotatably connected to the fixed frame, and the second end is rotatably connected to the movable frame. The movable frame is used for connecting the working part.

[0010] The drive assembly includes a first transmission member rotatably mounted on the fixed frame, a second transmission member fixedly disposed on the fixed frame, and a protrusion protruding from the swing frame. The first transmission member is provided with a receiving part and a first transmission part, and the second transmission member is provided with a second transmission part. At least one of the first transmission part and the second transmission part is provided with a helical surface, and the other part abuts against the helical surface. The receiving part and the protrusion are disposed in abutting position.

[0011] When the first transmission component is rotated, the first transmission part can slide relative to the second transmission part along the spiral surface, so that the first transmission component rises or falls. The first transmission component drives the swing frame through the protrusion, so that the second end swings up and down around the first end. When the second end swings up and down, it can drive the working part to move up and down.

[0012] In one embodiment, the first transmission member is provided with a limiting part, and the second transmission member is provided with a positioning part. The limiting part can abut against the positioning part to restrict the first transmission member from rotating relative to the second transmission member in one direction.

[0013] And / or, both the first transmission unit and the second transmission unit are configured in pairs.

[0014] In one embodiment, the receiving portion is configured as a toroidal structure, and the protrusion is movable relative to the toroidal structure in a circumferential direction;

[0015] Alternatively, the receiving part is rotatably disposed on the first transmission member, and the protrusion can move relative to the first transmission member in a circumferential direction through the receiving part;

[0016] Alternatively, the first transmission member may be provided with a splined portion, which can be driven to rotate the first transmission member.

[0017] In one embodiment, one of the fixing frame and the first transmission member is fixedly provided with a mounting post, and the other is inserted into the mounting post;

[0018] The spiral surface is spirally arranged around the axis of the mounting post.

[0019] In one embodiment, the mounting post is fixed to the fixing frame.

[0020] In one embodiment, the first transmission member and the second transmission member can form a first installation space. The first transmission part and the second transmission part are disposed in the first installation space. When the first transmission member rises or falls, the volume of the first installation space increases or decreases.

[0021] In one embodiment, the first transmission member has a first ring plate protruding from it, and the first ring plate is disposed around the first transmission part; the second transmission member has a second ring plate protruding from it, and the second ring plate is disposed around the second transmission part.

[0022] The first ring plate is inserted into the second ring plate so that the first transmission member and the second transmission member form the first installation space;

[0023] And / or, the contact area between the first transmission part and the second transmission part is filled with lubricant.

[0024] This utility model also proposes a lawnmower, including a housing, a height adjustment structure as described above, a mowing component installed on the height adjustment structure, and a drive component installed on the housing. The fixing frame is fixed to the housing, and the drive component is driven and connected to the first transmission component.

[0025] The working part is a cutter head structure.

[0026] In one embodiment, the driving member is driven to connect with the first transmission member via a transmission assembly, and a second mounting space is formed between the housing and the first transmission member;

[0027] The transmission assembly is located within the second installation space. The transmission assembly includes a spline shaft located in the first transmission member and a spline sleeve located in the drive member. When the first transmission member rises or falls, the volume of the second installation space increases or decreases.

[0028] In one embodiment, the first transmission member has a protruding third ring plate that surrounds the spline shaft, and the housing has a protruding fourth ring plate that surrounds the spline sleeve. The third ring plate is inserted into the housing to create a second mounting space between the housing and the first transmission member.

[0029] And / or, the contact area between the spline sleeve and the spline shaft is filled with lubricant.

[0030] The technical solution of this utility model involves rotating a first transmission component. The spiral surface allows the first transmission part to slide relative to the second transmission part, causing the first transmission component to rise or fall. The first transmission component, through the protrusion, drives the swing frame to swing up and down around its hinge with the fixed frame. When the swing frame swings up and down around its hinge with the fixed frame, it can drive the working part connected to the swing frame to move up and down, thereby adjusting the position of the cutter head structure. Compared with the prior art, which adjusts the height of the cutter head structure by adjusting the chassis of the lawnmower with multiple wheels, this method is more convenient. The height of the cutter head structure can be adjusted by operating only the first transmission component, thus solving the technical problems existing in the prior art. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of an embodiment of the lawnmower provided by this utility model;

[0033] Figure 2 for Figure 1 Cross-sectional view of a lawnmower;

[0034] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 for Figure 2 Schematic diagram of the height adjustment structure;

[0036] Figure 5 for Figure 4 Schematic diagram of the middle fixed frame;

[0037] Figure 6 for Figure 4 A schematic diagram of the structure of the first transmission component from a single perspective;

[0038] Figure 7 for Figure 4 A structural schematic diagram of the first transmission component from another perspective.

[0039] Explanation of icon numbers:

[0040] 100. Height adjustment structure; 200. Frame assembly; 210. Fixed frame; 220. Movable frame; 230. Swing frame; 240. Tension spring; 300. Drive assembly; 310. First transmission component; 320. First transmission part; 330. Second transmission component; 340. Second transmission part; 350. Limiting part; 360. Positioning part; 370. Receiving part; 380. Spline part; 390. Protrusion; 400. Mounting post; 500. First mounting space; 510. First ring plate; 520. Second ring plate; 600. Mowing assembly; 610. Blade disc structure; 700. Drive component; 800. Second mounting space; 810. Third ring plate; 820. Fourth ring plate; 900. Housing.

[0041] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0043] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] This utility model proposes a height adjustment structure 100 for use in lawnmowers, to solve the problem of inconvenient height adjustment of the cutter head structure 610 in lawnmowers, or the inability to adjust the height of the cutter head structure 610 according to user specifications. Of course, the height adjustment structure 100 of this application can also be used in other equipment that requires adjustment of the working part height, such as sweeping equipment and automatic shrub trimming equipment.

[0046] Please see Figure 1 , Figure 2 , Figure 3 In one embodiment of the present invention, the height adjustment structure 100 includes a frame assembly 200 and a drive assembly 300.

[0047] The frame assembly 200 includes a fixed frame 210, a movable frame 220, and two swing frames 230. The movable frame 220 is arranged opposite to the fixed frame 210, and the two swing frames 230 are arranged opposite to each other. Each swing frame 230 has a first end and a second end. The first end is rotatably connected to the fixed frame 210, and the second end is rotatably connected to the swing frame 230. It should be noted that the fixed frame 210 is fixedly installed. The fixed frame 210 can be fixed to a designated position by means of a detachable structure such as screws, or it can be integrally formed with a component at a designated position (such as the housing 900 of a lawnmower). It can be understood that when the fixed frame 210 is fixedly installed, the two swing frames 230 can rotate around the hinge (rotational connection) with the fixed frame 210 to realize the function of swinging up and down. Furthermore, when the two swing frames 230 swing up and down, the movable frame 220 can move up and down with the movement of the two swing frames 230. It should be noted that in this embodiment, the first end and the fixed frame 210, and the second end and the movable frame 220 can be connected by a pin, or they can be connected by other structures to achieve a rotatable connection.

[0048] The drive assembly 300 includes a first transmission member 310 rotatably mounted on the fixed frame 210, a second transmission member 330 fixedly disposed on the fixed frame 210, and a protrusion 390 protruding from the swing frame 230. It should be noted that the protrusion 390 is fixedly disposed with the swing frame 230, wherein the protrusion 390 can be integrally formed with the swing frame 230; or it can be fixedly disposed by means of screws, so that the protrusion 390 protrudes from the swing frame 230. The first transmission member 310 is provided with a receiving portion 370 and a first transmission portion 320, and the second transmission member 330 is provided with a second transmission portion 340. At least one of the first transmission portion 320 and the second transmission portion 340 is provided with a helical surface, and the other abuts against the helical surface. The receiving portion 370 and the protrusion 390 are disposed in contact. It should be noted that the receiving portion 370 and the protrusion 390 may or may not directly abut. When the receiving portion 370 and the protrusion 390 directly abut, the protrusion 390 abuts against the receiving portion 370. When the receiving portion 370 and the protrusion 390 do not directly abut, the protrusion 390 abuts against other structures, and the other structures abut against the receiving portion 370.

[0049] It should be noted that in some embodiments, the first transmission member 310 is disposed above the second transmission member 330, and the protrusion 390 is disposed above the first transmission member 310. In this case, to ensure good stability of the frame assembly 200 during use, a tension spring 240 is disposed between the two swing frames 230. Under the action of the tension spring 240, the protrusion 390 tends to move towards the receiving part 370. Since the protrusion 390 is disposed above the receiving part 370, under the action of gravity, the protrusion 390 naturally tends to move towards the receiving part 370. However, this design is not limited to this. In some embodiments, when the protrusion 390 is disposed below the first transmission member 310 and the first transmission member 310 is disposed below the second transmission member 330, a tension spring 240 is also disposed between the two swing frames 230. In this case, the tension spring 240 is mainly used to make the protrusion 390 tend to move towards the receiving part 370.

[0050] It should be further explained that, in this application, the example is that the protrusion 390 is located above the first transmission member 310, and the first transmission member 310 is located above the second transmission member 330.

[0051] When the first transmission member 310 is rotated, the helical surface enables the first transmission part 320 to slide relative to the second transmission part 340, and causes the first transmission member 310 to rise or fall. The first transmission member 310 drives the swing frame 230 to swing up and down around its hinge with the fixed frame 210 through the protrusion 390. It can be understood that since the protrusion 390 protrudes from the swing frame 230, when the first transmission member 310 drives the protrusion 390, the protrusion 390 can drive the swing frame 230, so that the second end of the swing frame 230 swings up and down around the first end, and the swing frame 230 swings up and down. When the second end swings up and down, it can drive the working part to move up and down.

[0052] Furthermore, in this embodiment, both the first transmission part 320 and the second transmission part 340 are configured as helical surfaces. In this case, the first transmission part 320 and the second transmission part 340 abut against each other, i.e., the two helical surfaces abut against each other. Since the second transmission member 330 is fixed to the fixed frame 210, it should be noted that the second transmission part 340 provided on the second transmission member 330 is also fixedly configured. Furthermore, when the first transmission member 310 rotates, the first transmission part 320 also rotates synchronously. It can be understood that with the two helical surfaces abutting, and when the first transmission part 320 rotates, one helical surface can slide relative to the other. Depending on the direction of rotation and under the action of the helical surfaces, the first transmission part 320 can rise or fall. At this time, the first transmission member 310 and the supporting part can also rise or fall synchronously through the first transmission part 320. When the supporting part rises or falls synchronously, it can drive the swing frame 230 to rise or fall through the protrusion 390. It should be noted that, since the protrusion 390 is located above the support portion, when the support portion moves upward, it can drive the protrusion 390 to move upward, thereby driving the swing frame 230 to swing upward about its hinge point with the fixed frame 210. When the support portion moves downward, under the action of gravity, the protrusion 390 can follow the support portion downward, thereby causing the support portion to swing downward about its hinge point with the fixed frame 210.

[0053] Furthermore, in some embodiments, for the first transmission part 320 or the second transmission part 340 that does not employ a helical surface, other structures (not shown) may also be used. For example, the transmission part (first transmission part 320 or second transmission part 340) may include multiple protrusions of varying heights, or protrusions of equal height, or a single protrusion. It should be further noted that the protrusions of varying heights may be arranged according to a spatial helical trajectory. It should also be noted that the multiple protrusions of varying heights may be continuous or discontinuous.

[0054] It should be noted that the movable frame 220 in this application is used for connection of the working unit. When the height adjustment structure 100 is applied to the lawnmower, the lawnmower includes a mowing assembly 600, which includes a blade structure 610. At this time, the working unit is the blade structure 610. After the blade structure 610 is connected to the movable frame 220, when the swing frame 230 swings up and down, it can drive the movable frame 220 to move up and down. The movable frame 220 can drive the blade structure 610 to swing up and down.

[0055] In this embodiment, by rotating the first transmission member, the spiral surface enables the first transmission part 320 to slide relative to the second transmission part 340, and causes the first transmission member 310 to rise or fall. The first transmission member 310 drives the swing frame 230 to swing up and down around its hinge with the fixed frame 210 via the protrusion 390. When the swing frame 230 swings up and down around its hinge with the fixed frame 210, it can drive the working part connected to the swing frame 230 to move up and down, thereby adjusting the position of the cutter head structure 610. Compared with the prior art, which adjusts the height of the cutter head structure 610 by adjusting multiple wheels, this method is more convenient. The height of the cutter head structure 610 can be adjusted by operating only the first transmission member, thus solving the technical problems existing in the prior art.

[0056] In one embodiment, reference Figure 6 The first transmission member 310 is provided with a limiting part 350, and the second transmission member 330 is provided with a positioning part 360. The limiting part 350 abuts against the positioning part 360 to restrict the first transmission member 310 from rotating relative to the second transmission member 330 in one direction. It should be noted that when the limiting part 350 and the positioning part 360 abut against each other in this embodiment, the first transmission member 310 can be restricted from rotating relative to the second transmission member 330 in one direction. Specifically, when the first transmission member 310 cannot rotate, it cannot continue to rise. That is to say, when the limiting part 350 abuts against the positioning part 360, even the maximum height of the first transmission member is reached, thus preventing the first transmission member 320 from disengaging from the second transmission member 340. Further, in some embodiments, when both the first transmission member 320 and the second transmission member 340 are configured as helical surfaces, the limiting part 350 protrudes from the helical surface of the first transmission member 320, and the positioning part 360 is configured as a sidewall structure on the second transmission member 340.

[0057] In one embodiment, reference Figure 5 , Figure 6 The first transmission part 320 and the second transmission part 340 are each configured in pairs. It should be noted that both the first transmission parts 320 and the second transmission parts 340 are arranged around the rotation axis of the first transmission member 310. It can be understood that when both the first transmission parts 320 and the second transmission parts 340 are configured in pairs, the contact area between the first transmission member 310 and the second transmission member 330 is increased, resulting in better stability during transmission. In some embodiments, the first transmission member 310 is provided with two limiting parts 350, which are respectively provided on the two first transmission parts 320. The second transmission member 330 is provided with two positioning parts 360, which are respectively sidewall structures on the two second transmission parts 340.

[0058] In one embodiment, reference Figure 7 The receiving portion 370 is configured as a toroidal structure, and the protrusion can move relative to the toroidal structure along a circumferential direction. In this embodiment, the toroidal structure is configured as a horizontal toroidal surface, and the toroidal surface can be a complete ring or a non-complete ring. In this case, the circumferential direction is the circumferential direction constructed by the horizontal toroidal surface. However, this design is not limited to this. In some embodiments (not shown), the toroidal structure can also have a certain taper. In this embodiment, the toroidal surface can be a complete ring or a non-complete ring. In this case, the circumferential direction is the circumferential direction constructed by the toroidal surface with a certain taper. The circumferential direction is not necessarily the circumferential direction of the outer circumference or the circumferential direction of the inner circumference of the toroidal structure; it can also be the circumferential direction of other circles. When the protrusion 390 on the swing frame 230 is in direct contact with the toroidal structure, it can be understood that the protrusion 390 is directly connected to the receiving portion 370. At this time, the receiving portion 370 can drive the protrusion 390 to rise or fall when it rises or falls. Furthermore, in this embodiment, the receiving part 370 is fixed to the first transmission member 310, wherein the receiving part 370 can be fixed to the first transmission member 310 by means of screw fastening or by means of integral molding.

[0059] However, this design is not limited to this. In some embodiments, the receiving portion 370 is rotatably disposed on the first transmission member 310. It should be noted that when the receiving portion 370 is rotatably disposed on the first transmission member 310, the protrusion 390 can move relative to the first transmission member 310 in a circumferential direction via the receiving portion 370. Specifically, a rolling element (not shown) is provided between the receiving portion 370 and the first transmission member 310. The receiving portion 370 can rotate horizontally relative to the first transmission member 310 via the rolling element. The rolling element can be a bearing. Furthermore, the friction between the receiving portion 370 and the first transmission member 310 can be reduced under the action of the rolling element, so that the receiving portion 370 and the first transmission member 310 can rotate relative to each other, thereby facilitating the movement of the protrusion relative to the first transmission member 310 in a circumferential direction. Furthermore, in this embodiment, the specific structure of the receiving portion 370 is not limited, as long as it enables the protrusion to move relative to the first transmission member 310 in a circumferential direction via the receiving portion.

[0060] Furthermore, when the protrusion 390 moves in a circumferential direction, the protrusion 390 and the receiving part 370 can be raised and lowered synchronously.

[0061] It should be noted that regardless of whether the aforementioned receiving part 370 is configured as a toroidal structure or rotates horizontally relative to the first transmission member 310, both methods can achieve the same upward or downward distance of the first transmission member 310, which in turn drives the protrusion 390 to rise or fall by the same distance. This facilitates the adjustment of the swing amplitude of the swing frame 230, and consequently, the adjustment of the upward or downward distance of the cutter head structure 610.

[0062] In one embodiment, reference Figure 7 The first transmission member 310 is provided with a splined portion 380. By driving the splined portion 380, the first transmission member 310 can be rotated. It should be noted that when the height adjustment structure 100 is applied to a lawnmower, the lawnmower is provided with a drive member 700, wherein the drive member 700 is configured as a drive motor. The drive motor drives the splined portion 380 through another splined structure. Further, the splined portion 380 on the first transmission member 310 can be a splined shaft or a splined sleeve. When the splined portion 380 on the first drive member 700 is a splined shaft, the drive motor drives the splined shaft through the splined sleeve.

[0063] It should be noted that when the lawnmower is equipped with a drive unit 700 and a height adjustment structure 100, the user can control the height adjustment structure 100 by controlling the drive unit 700. Specifically, by rotating the drive unit 700 at a certain angle, the first transmission component 310 is raised a certain distance. Furthermore, when mowing uneven grass areas, the lawnmower can obtain its distance from the ground through a distance sensing device. When the lawnmower is in a depression, the height adjustment structure 100 is adjusted via the drive unit 700 to increase the descent distance of the blade structure 610, thereby increasing the weed trimming size in the depression area. When the lawnmower is in a raised area, the height adjustment structure 100 is adjusted via the drive unit 700 to increase the rising distance of the blade structure 610, thereby decreasing the weed trimming size in the raised area, ensuring that the vertical height of the mowed lawn remains as uniform as possible.

[0064] In one embodiment, one of the fixing frame 210 and the first transmission member 310 is fixedly provided with a mounting post 400, and the other is inserted into the mounting post 400. It should be noted that the first transmission member 310 is rotatable about the axis of the mounting post 400. Furthermore, the helical surface is helically arranged about the axis of the mounting post 400. Further, in this embodiment, the mounting post 400 is fixed to the fixing frame 210, thus the first transmission member 310 is provided with a corresponding slot. However, this design is not limited to this; in some embodiments, the mounting post 400 can be fixed to the first transmission member 310, thus the fixing seat is provided with a slot corresponding to the mounting post 400.

[0065] In one embodiment, reference Figure 3 , Figure 5 , Figure 6To prevent foreign objects from entering between the first transmission part 320 and the second transmission part 340 and increasing the friction between them, the first transmission member 310 and the second transmission member 330 can construct a first installation space 500. The first transmission part 320 and the second transmission part 340 are located within the first installation space 500. Under the action of the first installation space 500, foreign objects can be blocked, preventing them from entering between the first transmission part 320 and the second transmission part 340. Furthermore, when the first transmission member 310 rises or falls, the volume of the first installation space 500 increases or decreases. It should be understood that the increase or decrease in the volume of the first installation space 500 refers to its consistent presence during both rising and falling, not its absence. In other words, when the swing frame 230 swings up and down, the first installation space 500 can continuously protect the first transmission part 320 and the second transmission part 340, preventing weeds from entering between them. Furthermore, in some embodiments, in order to further reduce the friction between the first transmission part 320 and the second transmission part 340, a lubricant can be filled at the contact point between the first transmission part 320 and the second transmission part 340. The lubricant can further reduce the friction between the first transmission part 320 and the second transmission part 340. In particular, when the first transmission part 320 and the second transmission part 340 are configured as helical surfaces, the contact area between them increases, and the friction between them can be reduced by the lubricant.

[0066] In one embodiment, the first transmission member 310 has a protruding first ring plate 510, which surrounds the first transmission part 320. The second transmission member 330 has a protruding second ring plate 520, which surrounds the second transmission part 340. The first ring plate 510 and the second ring plate 520 are inserted into each other to form the first installation space 500. It should be noted that in this embodiment, when the first transmission member 310 rises or falls, the first ring plate 510 can slide relative to the second ring plate 520 to increase or decrease the volume of the first installation space 500. At this time, the first ring plate 510 and the second ring plate 520 will not separate, so that the first installation space 500 always exists. This ensures that when the cutter head structure 610 is adjusted up and down, weeds will not enter the first installation space 500 through the first ring plate 510 and the second ring plate 520. Simultaneously, the insertion of the first ring plate 510 and the second ring plate 520 also enables the first transmission member 310 and the second transmission member 330 to have a guiding function, thereby ensuring the cooperation of the first transmission part 320 and the second transmission part 340. However, this design is not limited to this. In some embodiments, a closed ring structure is sleeved on the outer side of both the first transmission member 310 and the second transmission member 330, that is, the first transmission member 310 and the second transmission member 330 are inserted into the closed ring structure. In this case, a first installation space 500 is constructed within the closed ring structure.

[0067] This utility model also proposes a lawnmower, see reference. Figure 1 , Figure 2 The lawnmower includes a housing 900, a height adjustment structure 100, a mowing component 600 mounted on the height adjustment structure 100, and a drive component 700 mounted on the housing 900. The mowing component 600 includes a blade disc structure 610. The specific structure of the height adjustment structure 100 is as described in the above embodiments. Since this lawnmower adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here. The working part is the blade disc structure 610, the fixing frame 210 is fixed to the housing 900, and the drive component 700 is drivenly connected to the first transmission component 310 through a transmission assembly. It should be noted that the fixing component is fixed to the housing 900 by screws. However, this design is not limited to this; in some embodiments, the fixing component can also be part of the housing 900, that is, the fixing component is integrally formed with the housing 900.

[0068] In one embodiment, reference Figure 3 , Figure 7The driving component 700 is drivenly connected to the first transmission component 310 via a transmission assembly. A second mounting space 800 is formed between the housing 900 and the first transmission component 310. The transmission assembly is disposed within the second mounting space 800 and includes a splined shaft disposed in the first transmission component 310 and a splined sleeve disposed in the housing 900. When the first transmission component 310 rises or falls, the volume of the second mounting space 800 increases or decreases. The protective structure of the second mounting space 800 remains intact. Furthermore, the purpose of constructing the second mounting space 800 is to prevent external foreign objects from entering between the splined sleeve and the splined shaft, thereby ensuring the stability of the transmission. Further, in some embodiments, the contact area between the splined sleeve and the splined shaft is filled with lubricant to reduce friction between them.

[0069] In one embodiment, the first transmission member 310 is provided with a third ring plate 810, which surrounds the spline shaft. The housing 900 is provided with a fourth ring plate 820, which surrounds the spline sleeve. The third ring plate 810 is inserted into the housing 900 to form the second mounting space 800 between the housing 900 and the first transmission member 310. It is understandable that when the first transmission component 310 rises or falls, the third ring plate 810 can slide relative to the fourth ring plate 820 to increase or decrease the volume of the second installation space 800. At this time, the third ring plate 810 and the fourth ring plate 820 will not separate, so the second installation space 800 always exists. This ensures that when the cutter head structure 610 is adjusted up and down, weeds will not enter the second installation space 800 through the third ring plate 810 and the fourth ring plate 820. It should be noted that when the third ring plate 810 and the fourth ring plate 820 are used, a guiding structure can be established between the first transmission component 310 and the housing 900. The third ring plate 810 and the fourth ring plate 820 guide the rise or fall of the first transmission component 310.

[0070] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A height-adjustable structure, characterized in that, include: The frame assembly includes a fixed frame, a movable frame, and two swing frames, wherein the movable frame is arranged opposite to the fixed frame, and the two swing frames are arranged opposite to each other. Each swing frame has a first end and a second end. The first end is rotatably connected to the fixed frame, and the second end is rotatably connected to the movable frame. The movable frame is used for connecting the working part. The drive assembly includes a first transmission member rotatably mounted on the fixed frame, a second transmission member fixedly disposed on the fixed frame, and a protrusion protruding from the swing frame. The first transmission member is provided with a receiving part and a first transmission part, and the second transmission member is provided with a second transmission part. At least one of the first transmission part and the second transmission part is provided with a helical surface, and the other part abuts against the helical surface. The receiving part and the protrusion are disposed in abutting position. When the first transmission component is rotated, the first transmission part can slide relative to the second transmission part along the spiral surface, so that the first transmission component rises or falls. The first transmission component drives the swing frame through the protrusion, so that the second end swings up and down around the first end. When the second end swings up and down, it can drive the working part to move up and down.

2. The height adjustment structure as described in claim 1, characterized in that, The first transmission member is provided with a limiting part, and the second transmission member is provided with a positioning part. The limiting part can abut against the positioning part to restrict the first transmission member from rotating relative to the second transmission member in one direction. And / or, both the first transmission unit and the second transmission unit are configured in pairs.

3. The height adjustment structure as described in claim 1, characterized in that, The receiving part is configured as a ring structure, and the protrusion can move relative to the ring structure in a circumferential direction. Alternatively, the receiving part is rotatably disposed on the first transmission member, and the protrusion can move relative to the first transmission member in a circumferential direction through the receiving part; Alternatively, the first transmission member may be provided with a splined portion, which can be driven to rotate the first transmission member.

4. The height adjustment structure as described in claim 1, characterized in that, The fixing frame is fixed to one of the first transmission components with a mounting post, and the other is plugged into the mounting post; The spiral surface is spirally arranged around the axis of the mounting post.

5. The height adjustment structure as described in claim 4, characterized in that, The mounting column is fixed to the fixing frame.

6. The height adjustment structure as described in claim 1, characterized in that, The first transmission member and the second transmission member can form a first installation space. The first transmission part and the second transmission part are disposed in the first installation space. When the first transmission member rises or falls, the volume of the first installation space increases or decreases.

7. The height adjustment structure as described in claim 6, characterized in that, The first transmission component has a protruding first ring plate, which surrounds the first transmission part; the second transmission component has a protruding second ring plate, which surrounds the second transmission part. The first ring plate is inserted into the second ring plate so that the first transmission member and the second transmission member form the first installation space; And / or, the contact area between the first transmission part and the second transmission part is filled with lubricant.

8. A lawnmower, characterized in that, The device includes a housing, a height adjustment structure as described in any one of claims 1 to 7, a mowing assembly mounted on the height adjustment structure, and a drive unit mounted on the housing, wherein the fixing frame is fixed to the housing, and the drive unit is drivenly connected to the first transmission member; The working part is the blade disc structure in the mowing assembly.

9. The lawnmower as described in claim 8, characterized in that, The driving component is driven to connect with the first transmission component through a transmission assembly, and a second installation space is formed between the housing and the first transmission component. The transmission assembly is located within the second installation space. The transmission assembly includes a spline shaft located in the first transmission member and a spline sleeve located in the drive member. When the first transmission member rises or falls, the volume of the second installation space increases or decreases.

10. The lawnmower as described in claim 9, characterized in that, The first transmission component has a protruding third ring plate, which surrounds the spline shaft. The housing has a protruding fourth ring plate, which surrounds the spline sleeve. The third ring plate is inserted into the housing to create the second installation space between the housing and the first transmission component. And / or, the contact area between the spline sleeve and the spline shaft is filled with lubricant.

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