Cutter head lifting structure of mower and mower

Abstract

The utility model relates to the technical field of mowers, and provides a cutter head lifting structure of a mowing machine and the mowing machine, the mowing machine comprises a chassis, the cutter head lifting structure comprises a cutter head assembly, a knob gland, an adjusting knob, an upper spiral piece, a lower spiral piece, an upper spiral fixing piece, a mounting seat, a first elastic piece and a second elastic piece; the upper spiral fixing piece is connected to the chassis; the first elastic piece is connected with the adjusting knob and the upper spiral piece, and the adjusting knob is operated by a user to drive the upper spiral piece to coaxially rotate; the upper spiral part penetrates through and is rotationally connected to the upper spiral fixing part; the knob gland is connected to the upper spiral fixing part and is pressed on the adjusting knob; the upper spiral fixing piece is arranged on the upper side of the mounting seat, and the mounting seat is connected to the chassis in an up-down sliding manner; the second elastic part is connected with the mounting seat and the chassis, the lower spiral part is connected to the mounting seat, the upper spiral part comprises an upper spiral surface, the lower spiral part comprises a lower spiral surface, and the upper spiral surface is matched with the lower spiral surface. The structure is simple and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of mower, more particularly, a mower's cutterhead lifting structure and mower. BACKGROUND

[0002] The mower is also called grass trimmer, lawn mower, lawn trimmer and the like. The mower is a mechanical tool for trimming lawns, vegetation and the like. It is composed of a cutterhead, an engine, traveling wheels, a traveling mechanism, blades, a handrail and a control part. The blades of the mower greatly improve the output speed by high-speed rotation of the engine, thereby saving the working time of the grass trimmers and reducing a large amount of human resources.

[0003] The mower usually adjusts the distance from the ground of the blades by a lifting mechanism of the cutterhead. The existing lifting mechanism is usually controlled by electricity, which has a complex structure and a high cost and is inconvenient to maintain and repair. In addition, the layout of the chassis of the existing mower is that two rear drive wheels and one or two universal wheels are used as front wheels. The significant disadvantage of this layout is that the hub radius of the universal wheels is relatively small, and the off-road capability is poor. When encountering a bumpy area, the front wheels are easily stuck in a certain bump, and the "lying nest" phenomenon occurs. Moreover, the connection between the rear drive wheels and the main body of the chassis is rigid connection, which lacks the buffering capacity for uneven grasslands such as bumpy lawns, and the robot travels unstably and has poor motion performance, thereby resulting in poor mowing effect. SUMMARY

[0004] The utility model aims at overcoming at least one defect (shortcoming) of the prior art, and provides a cutterhead lifting structure of a mower and the mower. The cutterhead lifting structure has a simple structure and a low cost.

[0005] An object of the utility model is to provide a cutterhead lifting structure of a mower. The mower comprises a chassis. The cutterhead lifting structure comprises a mounting seat and a cutterhead assembly. The cutterhead assembly is connected to the mounting seat. The mounting seat is connected to the chassis. The cutterhead lifting structure further comprises a knob gland, an adjusting knob, an upper screw member, a lower screw member, an upper screw fixing member, a first elastic member and a second elastic member.

[0006] The upper screw fixing member is connected to the chassis. The upper end of the first elastic member is connected to the adjusting knob. The lower end of the first elastic member is connected to the upper screw member. The adjusting knob can be operated by a user to drive the upper screw member to rotate coaxially. The upper screw member penetrates and is rotatably connected to the upper screw fixing member. The knob gland is connected to the upper screw fixing member and is pressed on the adjusting knob.

[0007] The upper spiral fixing component is located on the upper side of the mounting base, which is slidably connected to the chassis. The upper end of the second elastic component is connected to the bottom of the mounting base, and the lower end is connected to the chassis. The lower spiral component is connected to the mounting base. The upper spiral component includes an upper spiral surface, and the lower spiral component includes a lower spiral surface. The upper and lower spiral surfaces match. When the adjusting knob is pressed down and rotated, the first elastic component is compressed, and the contact area between the upper and lower spiral surfaces decreases or increases. The lower spiral component drives the mounting base to move down or up. When the adjusting knob is released, the first elastic component returns to its original position, and the upper and lower spiral surfaces are fixed in place.

[0008] The cutter head assembly is connected to the mounting base and is used for cutting.

[0009] The upper spiral fixing component and the chassis can be fixedly connected or detachably connected, as long as it can secure the upper spiral fixing component to the chassis. The first and second elastic components are, for example, springs. The first elastic component moves the adjusting knob upwards and resets, while the second elastic component moves the mounting base upwards and resets. The user can operate the cutter head by rotating the adjusting knob. Preferably, the adjusting knob extends at least partially beyond the knob cover for user operation; the knob cover presses the adjusting knob down, and its design is sufficient to fix the adjusting knob in the non-adjusting state. The fixing method can be relative to the knob through friction, a snap-fit ​​structure, or a fastener structure, etc. The mounting base can move up and down relative to the chassis.

[0010] When adjusting the height of the cutter head, press down the adjustment knob so that the upper surface of the knob disengages from the knob cover. The upper spiral component moves downward, and the upper and lower spiral surfaces come into contact. Rotating the adjustment knob reduces the contact area between the two surfaces, causing the lower spiral component to move downward, which in turn moves the mounting base downward, and consequently, moves the cutter head assembly on the mounting base downward. Releasing the adjustment knob allows the knob to re-engage with the knob cover under the reset action of the first elastic element, and the knob cover presses the adjustment knob down again, thus achieving the downward movement of the cutter head. Similarly, when the adjustment knob is rotated in the opposite direction, the contact area between the upper and lower spiral surfaces increases, and the two surfaces re-match. The lower spiral surface moves upward under the reset action of the second elastic element, thus achieving the upward movement of the cutter head.

[0011] In this solution, the user can manually operate the lifting and lowering of the cutter head. The cutter head lifting structure is simple in structure, easy to maintain and repair, low in cost, and easy to operate.

[0012] Furthermore, both the upper surface of the adjustment knob and the lower surface of the knob cover are provided with serrations, and the adjustment knob and the knob cover are engaged by the serrations.

[0013] In the technical solution, when the adjusting knob reset is pressed by the knob cover, the two are locked by the sawtooth, which is more firm than the relative fixation by increasing the surface roughness, prevents the adjusting knob from rotating when the height is not required to be adjusted, avoids the influence on the mowing work caused by the miscalibration of the cutter head, and ensures the smooth mowing work.

[0014] Further, the upper screw part is provided with a convex part, the bottom of the adjusting knob is provided with a concave part, the convex part passes through the first elastic part and is connected to the concave part of the adjusting knob.

[0015] The convex part passes through the first elastic part, and the first elastic part is sleeved on the convex part, the sleeving of the first elastic part and the matching of the convex part and the concave part reduce the axial length of the lifting structure, the structure is compact, the overall volume is reduced, transportation and use are facilitated, the distance between the adjusting knob and the upper screw part is reduced, and the user can save more labor when rotating the adjusting knob to rotate the upper screw part.

[0016] Further, the cutter head assembly comprises a mowing motor, a cutter head shaft, a cutter head and a blade, the mowing motor is installed in the mounting seat and used for driving the cutter head shaft to rotate, the lower end of the cutter head shaft passes through the bottom plate and is connected with the cutter head, and the blade is installed on the cutter head.

[0017] Further, the cutter head assembly further comprises a cutter head cover, the cutter head cover is connected to the bottom of the mounting seat through at least two connecting columns, and the cutter head shaft passes through the cutter head cover and the bottom plate in sequence and is connected with the cutter head.

[0018] Further, the bottom plate is provided with at least two vertical shafts, the upper screw fixing part is connected to the top end of the vertical shaft, the mounting seat is sleeved on the vertical shaft and is operable to slide relative to the vertical shaft, and the second elastic part is sleeved on the vertical shaft and the top end of the second elastic part is connected to the mounting seat.

[0019] Another object of the utility model is to provide a mower, the mower comprises a bottom plate and the cutter head lifting structure of any one of the above,

[0020] The lower side of the chassis is connected with a power module, the power module comprises four wheel bridge assemblies, each wheel bridge assembly comprises a module skeleton, a suspension rod, a wheel and a driving part, the module skeleton is connected to the chassis, the driving part is connected to the wheel for driving the wheel to rotate, one end of the suspension rod is hinged to the module skeleton, and the other end is hinged to the driving part, and a plurality of suspension rods are hinged between each driving part and the module skeleton.

[0021] When driving in a pothole area, when driving into a pit, the wheel loses ground support and enters the pit, at this time, the spring elastic force is released, the shock absorber is elongated, the chassis is lifted relative to the wheel, so that the falling range of the chassis is reduced, when driving out of the pit or encountering a ridge, the wheel is quickly lifted by the obstacle, at this time, the shock absorber spring is compressed, the shock absorber is shortened, the chassis is lowered relative to the wheel, so that the lifting range of the chassis is reduced. In combination with the hinged arrangement of the suspension rod, the shock absorption and buffering functions are realized, so that the stability of the mower is improved, the off-road performance is excellent, more ground environments are adapted, and the applicability is improved.

[0022] Further, the suspension rods are even, one half of the suspension rods are connected to the upper part of the driving part, and the other half of the suspension rods are connected to the lower part of the driving part. The arrangement of the upper and lower two suspension rods further improves the stability of the wheel.

[0023] Compared with the prior art, the utility model has the advantages that:

[0024] (1) In the utility model, the user can manually operate the lifting of the cutter head, the cutter head lifting structure is simple in structure, convenient to maintain and maintain, low in cost, and easy to operate.

[0025] (2) The utility model realizes the shock absorption and buffering functions through the arrangement of the four wheels and the four independent suspensions, so that the stability of the mower is improved, the off-road performance is excellent, more ground environments are adapted, and the applicability is improved. DRAWINGS

[0026] Figure 1 It is an explosion view of the cutter head lifting structure.

[0027] Figure 2 It is another view of the explosion view of the cutter head lifting structure.

[0028] Figure 3 It is a sectional view of the cutter head lifting structure.

[0029] Figure 4 It is a structural schematic view of the adjusting knob.

[0030] Figure 5 It is a structural schematic view of the upper screw member.

[0031] Figure 6 Structure diagram of the cutter head cover.

[0032] Figure 7 Structure diagram of the bottom plate.

[0033] Figure 8 Structure diagram of the wheel assembly.

[0034] Figure 9 Structure diagram of two connected wheel assemblies.

[0035] Figure 10 Complete structure diagram of the mower.

[0036] Figure 11 Structure diagram of the upper cover.

[0037] Fig. 1 is a structure diagram of the cutter head assembly 100, the mower motor 110, the cutter head shaft 120, the cutter head cover 130, the connecting column 131, the cover plate 132, the side plate 133, the cutter head 140, the cutter blade 150, the knob cover 200, the adjusting knob 300, the recess 310, the upper spiral part 400, the upper spiral fixing part 410, the first elastic part 420, the sound imitation ring 430, the upper spiral surface 450, the central shaft 460, the lower spiral part 500, the lower spiral surface 510, the open cavity 520, the mounting seat 600, the upper cover 700, the camera 710, the radar module 720, the collision detection module 730, the bottom plate 800, the vertical shaft 810, the circuit board 820, the wheel assembly 900, the module skeleton 910, the suspension rod 920, the wheel 930, the driving part 940, and the shock absorber 950. DETAILED DESCRIPTION

[0038] The drawings of the utility model are only used for example description and cannot be understood as the limitation of the utility model. In order to better illustrate the following embodiments, some components in the drawings can be omitted, enlarged or reduced, and the size of the actual product is not represented; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings can be omitted.

[0039] Embodiment 1

[0040] Reference Figures 1 to 7 , a cutter head lifting structure of a mower is provided, the mower comprising a bottom plate 800, the cutter head lifting structure comprising: a cutter head assembly 100, a knob cover 200, an adjusting knob 300, an upper spiral part 400, a lower spiral part 500, an upper spiral fixing part 420, a mounting seat 600, a first elastic part 420 and a second elastic part.

[0041] The upper screw fixing part 420 is connected to the bottom plate 800, the upper end of the first elastic part 420 is connected to the adjusting knob 300, the lower end is connected to the upper screw part 400, the adjusting knob 300 can be operated by the user to drive the upper screw part 400 to rotate coaxially; the upper screw part 400 is connected to the upper screw fixing part 420 in a penetrating and rotating manner, the knob pressing cover 200 is connected to the upper screw fixing part 420 and is pressed on the adjusting knob 300;

[0042] The upper screw fixing part 420 is arranged on the upper side of the mounting seat 600, the mounting seat 600 is connected to the bottom plate 800 in a sliding manner, the upper end of the second elastic part is connected to the bottom of the mounting seat 600, the lower end is connected to the bottom plate 800, the lower screw part 500 is connected to the mounting seat 600, the upper screw part 400 comprises an upper screw surface 450, the lower screw part 500 comprises a lower screw surface 510, the upper screw surface 450 and the lower screw surface 510 are matched, when the adjusting knob 300 is pressed and rotated, the contact area of the upper screw surface 450 and the lower screw surface 510 is reduced or increased, the mounting seat 600 is driven to move downward or upward; when the adjusting knob 300 is released, the first elastic part 420 is reset, the upper screw surface 450 and the lower screw surface 510 are fixed in position;

[0043] The cutter head assembly 100 is connected to the mounting seat 600 and is used for cutting.

[0044] The upper screw fixing part 420 and the bottom plate 800 can be fixedly connected or detachably connected, as long as the upper screw fixing part 420 can be fixed on the bottom plate 800; in the embodiment, at least two vertical shafts 810 are arranged on the bottom plate 800, for example, two, three or four, preferably four; the upper screw fixing part 420 is connected to the top end of the vertical shaft 810 and is connected through threads, which is convenient for disassembly and maintenance; the mounting seat 600 is sleeved on the vertical shaft 810 and is operatively slidable relative to the vertical shaft 810, the second elastic member is sleeved on the vertical shaft 810, and the top end of the second elastic member is connected to the mounting seat 600. Specifically, the mounting seat 600 is square as a whole, and a hollow cylinder is arranged at each corner of the mounting seat 600, and the four vertical shafts 810 on the bottom plate 800 pass through the hollow cylinders and are threadedly connected with the upper screw fixing part 420. Such an arrangement makes the mounting seat 600 and the vertical shaft 810 overlap in space, greatly reducing the overall volume of the cutter head lifting, making the structure compact, thereby reducing the overall volume of the mower and making it more flexible. The first elastic member 420 and the second elastic member are, for example, springs, and the user can rotate the adjustment knob 300 to perform the cutter head lifting operation, preferably, the adjustment knob 300 at least partially protrudes from the knob gland 200 for user operation; the knob gland 200 presses the adjustment knob 300 thereunder, and the arrangement only needs to be able to fix the adjustment knob 300 in a non-adjusting state, and the fixing mode can be relative fixation by friction, relative fixation by clamping structure or relative fixation by buckling structure.

[0045] Preferably, the bottom of the upper screw part 400 is connected with a central shaft 460, the lower screw part 500 is provided with an open cavity 520, and the central shaft 460 is partially inserted into the open cavity 520, which facilitates the alignment of the two screw parts and makes the two screw surfaces match when they are in contact.

[0046] Preferably, the upper surface of the adjustment knob 300 and the lower surface of the knob gland 200 are both provided with sawteeth, and the adjustment knob 300 and the knob gland 200 are clamped by the sawteeth. When the adjustment knob 300 is reset and pressed by the knob gland 200, the two are clamped by the sawteeth, which is more secure than relative fixation by increasing the surface roughness, prevents the adjustment knob 300 from rotating when the height is not needed to be adjusted, avoids affecting the mowing work due to the cutter head being adjusted by mistake, and thus ensures the smooth progress of the mowing work.

[0047] Preferably, the upper screw fixing part 420 is provided with an annular protrusion, the knob gland 200 is circular, and the knob gland 200 is threadedly connected with the annular protrusion, which is convenient for maintenance and disassembly.

[0048] Preferably, the upper screw part 400 is provided with a convex part 440, the bottom of the adjusting knob 300 is provided with a concave part 310, the convex part 440 passes through the first elastic part 420 and is connected to the concave part 310 of the adjusting knob 300. The concave part 310 of the adjusting knob 300 is provided with a rotating rod, and the convex part 440 is provided with a rotating groove, and the rotating rod is inserted into the rotating groove and matched. Through the sleeving of the first elastic part 420 and the matching of the convex part 440 and the concave part 310, the axial length of the lifting structure is reduced, the structure is compact, the overall volume is reduced, the transportation and use are facilitated, and the distance between the adjusting knob 300 and the upper screw part 400 is reduced. When the user rotates the adjusting knob 300 to make the upper screw part 400 rotate, it can be more labor-saving.

[0049] Preferably, the upper screw part 400 is further fixedly connected with a sound imitation ring 430, the outer wall of the sound imitation ring 430 is provided with a plurality of concave circles, the upper screw fixing part 420 is provided with an upwardly extending extension ring, and a top head is connected in the extension ring. When the upper screw part 400 rotates, the top head slides from one concave circle to another concave circle, and a "ding-ding-ding" sound is emitted, which facilitates the user to control the rotation of the adjusting knob 300 and optimizes the experience.

[0050] Preferably, the cutter assembly 100 comprises a mowing motor 110, a cutter shaft 120, a cutter disc 140 and a blade 150. The mowing motor 110 is mounted in the mounting seat 600 and used to drive the cutter shaft 120 to rotate. The lower end of the cutter shaft 120 passes through the bottom disc 800 and connects the cutter disc 140, and the blade 150 is mounted on the cutter disc 140. The cutter assembly 100 further comprises a cutter guard 130, which is connected to the bottom of the mounting seat 600 through at least two connecting columns 131, for example, two, three or four connecting columns 131. The cutter shaft 120 passes through the cutter guard 130 and the bottom disc 800 in sequence and is connected with the cutter disc 140. Specifically, the upper end of the cutter shaft 120 is connected with the mowing motor 110, and the lower end is connected with the cutter disc 140. The cutter guard 130 is preferably connected to the bottom of the mounting seat 600 through four connecting columns 131. The cutter guard 130 comprises a guard plate 132 and a side plate 133. The side plate 133 is connected to the side of the guard plate 132 and extends downward. The mowing motor 110 is preferably provided with two mowing motors 110, and the cutter shaft 120, the cutter disc and the blade 150 are all provided with two corresponding ones. The lower screw part 500 is arranged in the middle of the mounting seat 600, and the mowing motor 110 is arranged on both sides of the lower screw part 500. In this way, when the mounting seat 600 is lowered or raised by the lower screw part 500, the mounting seat 600 will not tilt, so that the heights of the two cutter discs 140 remain consistent, which is more in line with the actual needs of mowing and maintains the stability of the lifting structure of the cutter disc 140 as a whole.

[0051] The principle of using the lifting structure of the embodiment is as follows: when the user wants to adjust the height of the cutter head 140, the adjusting knob 300 is pressed down, so that the upper surface of the adjusting knob 300 is separated from the knob pressing cover 200, the upper screw member 400 moves down, the upper screw surface 450 and the lower screw surface 510 are in contact, the adjusting knob 300 is rotated, the contact area between the two surfaces is reduced, the lower screw member 500 moves down, the mounting seat 600 moves down, and then the cutter head assembly 100 on the mounting seat 600 moves down, the adjusting knob 300 is loosened, the adjusting knob 300 and the knob pressing cover 200 are reattached under the reset action of the first elastic member 420, the knob pressing cover 200 presses the adjusting knob 300 again, and the downward movement of the cutter head 140 is realized; similarly, when the adjusting knob 300 is rotated in the opposite direction, the contact area of the upper screw surface 450 and the lower screw surface 510 increases, the two surfaces are matched again, the lower screw surface 510 moves up under the reset action of the second elastic member, and the upward movement of the cutter head 140 is realized.

[0052] Embodiment 2

[0053] Reference Figure 10 The embodiment provides a mower, which comprises a top cover 700, a chassis 800 and the cutter head lifting structure provided in the embodiment 1.

[0054] Reference Figure 8 And Figure 9 The power module comprises four wheel bridge assemblies 900, each wheel bridge assembly 900 comprises a module skeleton 910, a suspension rod 920, a wheel 930 and a driving component 940, the module skeleton 910 is connected to the chassis 800, the driving component 940 is connected to the wheel 930 and used for driving the wheel 930 to rotate, one end of the suspension rod 920 is hinged to the module skeleton 910, and the other end is hinged to the driving component 940, and a plurality of suspension rods 920 are hinged between each driving component 940 and the module skeleton 910. The wheel bridge assembly 900 further comprises a shock absorber 950, one end of the shock absorber 950 is hinged to the driving component 940, and the other end is hinged to the module skeleton 910. The suspension rods 920 are even in number, half of the suspension rods 920 are connected to the upper part of the driving component 940, and the other half of the suspension rods 920 are connected to the lower part of the driving component 940. Specifically, the driving component 940 comprises a wheel 930 motor and a motor shell, an output shaft of the wheel 930 motor is connected to the wheel 930 and used for driving the wheel 930 to rotate, and the motor shell is sleeved on the wheel 930 motor; the suspension rods 920 are four, two of which are connected to the upper part of the motor shell and form upper suspension arms, and the other two are connected to the lower part of the motor shell and form lower suspension arms. The shock absorber 950 is a shock spring.

[0055] The four wheels 930 connected by the chassis 800 form four independent suspensions. When driving in a bumpy area, when driving into a pit, the wheel loses ground support into the pit, at this time the spring elastic force is released, the shock absorber 950 is elongated, the chassis 800 is lifted relative to the wheel 930, so that the falling range of the chassis 800 is reduced, when driving out of the pit or encountering a ridge, the wheel is quickly lifted by the obstacle, at this time the spring of the shock absorber 950 is compressed, the shock absorber 950 is shortened, the chassis 800 is lowered relative to the wheel 930, so that the lifting range of the chassis 800 is reduced. Thus, the shock absorption and buffering function is realized, so that the stability of the mower is improved, the off-road performance is excellent, more ground environments are adapted, and the applicability is improved.

[0056] Reference Figure 7 The upper side of the chassis 800 is connected with a circuit board 820, and the circuit board 820 is provided with a wireless transmission module, a Bluetooth module and an RTK satellite positioning module. The middle of the upper side of the chassis 800 is connected with four vertical shafts 810.

[0057] Reference Figure 11 The upper cover 700 is a shell in the shape of a car, and the upper cover 700 is provided with a front windshield, and a camera 710 module is mounted on the upper side of the front windshield; the upper cover 700 is provided with a front lamp, and a radar module 720 is mounted at the front lamp; the upper cover 700 is provided with a bumper beam, and a collision detection module 730 is mounted on the bumper beam.

[0058] The surrounding environment data is acquired through the radar and the camera 710, the running path of the mower is automatically calculated through the algorithm in the chip on the circuit board 820, the position information from the satellite and the nearby base station is acquired in real time through the RTK satellite positioning module. The chip controls the motor of the wheel 930 to drive the driving wheel to move along the specified path, and the mower motor 110 is also rapidly rotated under the driving of the circuit board 820, so as to drive the cutterhead 140 to rotate, and the cutterhead 140 cuts the grass on the lawn with the blade 150.

[0059] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the technical scheme of the utility model, and are not a limitation on the specific embodiments of the utility model. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model claim shall be included in the protection scope of the utility model claim.

Claims

1. A cutterhead lifting structure of a mower, the mower comprising a chassis, the cutterhead lifting structure comprising a mounting seat and a cutterhead assembly, the cutterhead assembly being connected to the mounting seat, the mounting seat being connected to the chassis, characterized in that, The cutter head lifting structure further comprises a knob cover, an adjusting knob, an upper screw, a lower screw, an upper screw fixing member, a first elastic member and a second elastic member; The upper screw fixing member is connected to the bottom plate; the upper end of the first elastic member is connected to the adjusting knob, and the lower end is connected to the upper screw, and the adjusting knob can be operated by a user to drive the upper screw to rotate coaxially; the upper screw penetrates and is rotatably connected to the upper screw fixing member, and the knob cover is connected to the upper screw fixing member and presses on the adjusting knob; The upper screw fixing member is arranged on the upper side of the mounting seat, and the mounting seat is slidably connected to the bottom plate; the upper end of the second elastic member is connected to the bottom of the mounting seat, and the lower end is connected to the bottom plate; the lower screw is connected to the mounting seat; the upper screw comprises an upper screw surface, the lower screw comprises a lower screw surface, and the upper screw surface and the lower screw surface are matched; when the adjusting knob is pressed and rotated, the first elastic member is compressed, the contact area of the upper screw surface and the lower screw surface is reduced or increased, and the lower screw drives the mounting seat to move downward or upward; when the adjusting knob is released, the first elastic member is reset, and the upper screw surface and the lower screw surface are fixed in position. The cutter head assembly is connected to the mounting seat and is used for cutting.

2. The mower head lifting structure according to claim 1, wherein The upper surface of the adjusting knob and the lower surface of the knob cover are both provided with sawteeth, and the adjusting knob and the knob cover are clamped by the sawteeth.

3. The mower head lifting structure according to claim 1, wherein The upper screw is provided with a protruding part, and the bottom of the adjusting knob is provided with a recessed part; the protruding part penetrates the first elastic member and is connected to the recessed part of the adjusting knob.

4. The mower head lifting structure according to claim 3, wherein The recessed part of the adjusting knob is provided with a rotating rod, and the protruding part is provided with a rotating groove; the rotating rod is inserted into the rotating groove and is matched and connected.

5. The mower head lifting structure according to claim 1, wherein The cutter head assembly comprises a mowing motor, a cutter head shaft, a cutter head and a blade; the mowing motor is mounted in the mounting seat and is used to drive the cutter head shaft to rotate; the lower end of the cutter head shaft penetrates the bottom plate and is connected to the cutter head; the cutter head is provided with the blade.

6. A mower deck lift structure according to claim 5 wherein, The cutter head assembly further comprises a cutter head cover; the cutter head cover is connected to the bottom of the mounting seat through at least two connecting columns; the cutter head shaft penetrates the cutter head cover and the bottom plate in sequence and is connected to the cutter head.

7. The mower head lifting structure according to claim 1, wherein The bottom plate is provided with at least two vertical shafts; the upper screw fixing member is connected to the top end of the vertical shaft; the mounting seat is sleeved on the vertical shaft and is slidably connected to the vertical shaft; the second elastic member is sleeved on the vertical shaft, and the top end of the second elastic member is connected to the mounting seat.

8. A lawnmower characterised in that, The lawn mower comprises a bottom plate and the cutter head lifting structure according to any one of claims 1-7; the lower side of the bottom plate is connected with a power module; the power module comprises four wheel bridge assemblies; each wheel bridge assembly comprises a module skeleton, a suspension rod, a wheel and a driving part; the module skeleton is connected to the bottom plate; the driving part is connected to the wheel and is used to drive the wheel to rotate; one end of the suspension rod is hingedly connected to the module skeleton, and the other end is hingedly connected to the driving part; a plurality of suspension rods are hingedly connected between each driving part and the module skeleton.

9. The lawnmower as claimed in claim 8, characterized in that The wheel bridge assembly further comprises a shock absorber; one end of the shock absorber is hingedly connected to the driving part, and the other end is hingedly connected to the module skeleton.

10. The mower of claim 8, wherein, The suspension rods connected to each driving part are even in number; half of the suspension rods are connected to the upper part of the driving part, and the other half of the suspension rods are connected to the lower part of the driving part.

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