Lawn mower

Abstract

The invention provides a mower which has a grass chopping mode and a grass collecting mode and comprises a machine shell, a door assembly and a rotary knob assembly, a cutting cavity is formed in the machine shell, and a communication opening is formed in the machine shell; the door assembly is connected to the machine shell in a pivoted mode, when the door assembly is located at the opening position, the cutting cavity is connected with the communicating opening, and the mower is in a grass collecting mode; when the door assembly is in the closing position, the communication opening is closed, and the mower is in a grass chopping mode; the knob assembly is connected to the door assembly and can drive the door assembly to move, the knob assembly further comprises a locking piece with a locking state and an activation state, when the locking piece is in the locking state, the knob assembly cannot rotate, and when the locking piece is in the activation state, the knob assembly can rotate; the rotation axis of the locking piece is perpendicular to the rotation axis of the rotary knob assembly.

Description

Technical Field

[0001] The invention relates to a lawn mower and belongs to the technical field of garden tools. Background Art

[0002] In order to adapt to different scenarios, existing lawn mowers are often provided with blocks, and then the different modes of the lawn mower are switched during the process of removing the blocks. However, after the blocks are removed, they cannot be properly stored, so that the blocks are often lost.

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

[0004] The object of the present invention is to provide a lawn mower to solve the problem that the stopper is easily lost.

[0005] To achieve the above object, the present invention provides a lawn mower having a grass cutting mode and a grass collecting mode, the lawn mower comprising:

[0006] A casing, wherein the casing is formed with a cutting cavity and is also provided with a communication port;

[0007] a door assembly, the door assembly being pivotally connected to the housing, wherein when the door assembly is in an open position, the cutting chamber is connected to the communication port, and the lawn mower is in a grass collecting mode; when the door assembly is in a closed position, the communication port is closed, and the lawn mower is in a grass chopping mode;

[0008] A knob assembly, the knob assembly being connected to the door assembly and capable of driving the door assembly to move when the knob assembly is rotated;

[0009] Wherein, the knob assembly includes a locking member, which has a locked state and an activated state. When the locking member is in the locked state, the knob assembly cannot rotate, and when the locking member is in the activated state, the knob assembly can rotate, and the rotation axis of the locking member is perpendicular to the rotation axis of the knob assembly.

[0010] As a further improvement of the present invention, the knob assembly includes a knob base and a knob cover, one end of the locking member is accommodated in a storage cavity between the knob base and the knob cover, and the other end abuts against the outer wall surface of the casing and can rotate along the outer wall surface, and the outer wall surface of the casing is provided with at least two locking grooves on the rotation path of the locking member, and when the other end of the locking member is accommodated in the locking groove, the locking member is in a locked state, and the knob assembly cannot rotate; when the knob cover is pressed, one end of the locking member moves toward the knob base, and the other end disengages from the locking groove, the locking member is in an activated state, and the knob assembly can rotate.

[0011] As a further improvement of the present invention, the locking piece is roughly V-shaped, including a first locking arm, a second locking arm and a connecting arm connecting the first locking arm and the second locking arm, the first locking arm is accommodated in the storage cavity and abuts against the knob cover, the connecting arm is connected to the knob base through a rotating shaft, and the second locking arm is accommodated in the locking groove.

[0012] As a further improvement of the present invention, the rotating member also includes an elastic member arranged in the storage cavity. In the vertical direction, the first locking arm is clamped by the knob cover and the elastic member. When the knob cover is pressed, the first locking arm is pushed to compress the elastic member, and the second locking arm is tilted upward to disengage from the locking groove, and the rotating member is in a rotatable state; after the pressure is released, the elastic member drives the first locking arm to reset, and the second locking arm is accommodated in the locking groove, and the rotating member is in a locked state.

[0013] As a further improvement of the present invention, a positioning strip protruding toward the first locking arm is provided on the inner wall of the knob cover, and a positioning groove is correspondingly recessed on the side of the first locking arm facing the knob cover, and the positioning strip extends into the positioning groove and abuts against the first locking arm in real time.

[0014] As a further improvement of the present invention, a positioning portion and a positioning shaft passing through the positioning portion are provided at one end of the knob base away from the locking groove, and the knob cover is provided with a receiving groove for accommodating the positioning portion. A through hole is provided on the side wall of the knob cover, and the through hole is connected to the receiving groove for the positioning shaft to pass through, so that the knob cover is rotatably connected to the knob base.

[0015] As a further improvement of the present invention, a through hole is provided on the housing for the door assembly to pass through, and the door assembly passes through the through hole and is fixedly connected to the knob base to rotate synchronously with the rotating member.

[0016] As a further improvement of the present invention, the door assembly includes a transmission shaft and a stopper connected to the transmission shaft, and the transmission shaft passes through the through hole and is fixedly connected to the knob base.

[0017] As a further improvement of the present invention, the lawn mower also includes a guide plate fixedly connected to the casing, the guide plate is provided with a guide surface and a through hole, the guide surface is accommodated in the casing, the through hole is exposed outside the casing, and the transmission shaft passes through the through hole and can rotate along the guide surface.

[0018] As a further improvement of the present invention, the casing is also provided with a positioning block fixedly connected to the guide plate, one end of the transmission shaft passes through the through hole to be exposed to the outside of the shell, and the other end is fixedly connected to the positioning block to achieve a fixed connection between the door assembly and the shell.

[0019] The beneficial effects of the present invention are as follows: the lawn mower of the present invention has a door assembly pivotably connected to the casing, and a knob assembly is connected to the door assembly, so that the door assembly can be driven to move by the rotation of the knob assembly; in addition, the locking piece of the knob assembly is set to have a locked state and an activated state, so that when the locking piece is in the locked state, the knob assembly cannot be rotated, and when the locking piece is in the activated state, the knob assembly can be rotated, thereby realizing the switching of the lawn mower between the grass collecting mode and the grass chopping mode, and the operation is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a lawn mower according to a preferred embodiment of the present invention.

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure of the lawn mower from another angle.

[0022] Figure 3 yes Figure 2 Schematic diagram of the center grass bag and door assembly after disassembly.

[0023] Figure 4 yes Figure 2 Schematic diagram of the middle door assembly and guide plate after disassembly.

[0024] Figure 5 yes Figure 1 Schematic diagram of the combined structure of the middle door assembly, knob assembly and casing.

[0025] Figure 6 yes Figure 5 Exploded diagram.

[0026] Figure 7 yes Figure 6 Exploded view of the knob assembly.

[0027] Figure 8 yes Figure 6 Exploded view of the center base, guide plate, and door assembly.

[0028] Fig. 9 yes Figure 6 Exploded view of the center locating block, guide plate and rear baffle.

[0029] Fig.10 This is an exploded view of the guide plate and door assembly in 6.

[0030] Fig.11 yes Figure 5 Cross-sectional view of the center knob assembly.

[0031] Fig.12 yes Figure 1 Another exploded view of the lawn mower. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The present invention discloses a lawn mower 1, which has a grass collecting mode and a grass chopping mode, and can switch between the two modes at will to cope with the demand for processing cut grass clippings in different scenarios.

[0034] The lawn mower 1 of the present invention will be described below with reference to specific embodiments.

[0035] See also Figures 1 to 4 The present invention discloses a lawn mower 1, comprising a housing 10, a door assembly 2, a knob assembly 3, a cutting assembly 4 and a grass collecting bag 5. Among them, the bottom of the casing 10 is provided with an opening to form a cutting chamber 11, and a connecting port 12 is opened on the side wall of the casing 10, and the cutting chamber 11 is connected to the connecting port 12. In addition, the casing 10 is also provided with a grass collecting channel 13 connected to the connecting port 12; the cutting component 4 is partially accommodated in the cutting chamber 11 and can rotate in the cutting chamber 11; the grass collecting bag 5 is detachably fixed to the rear side of the casing 10, and is connected to the cutting chamber 11 through the grass collecting channel 13 and the connecting port 12; the door component 2 is pivotally connected to the casing 10 to cover or expose the connecting port 12, when the door component 2 is in the open position, the cutting chamber 11 is connected to the connecting port 12, and the lawn mower 1 is in the grass collecting mode, when the door component 2 is in the closed position, the connecting port 12 is closed, and the lawn mower 1 is in the grass chopping mode.

[0036] As can be seen, the communication port 12 can be covered or exposed by rotating the door assembly 2 , so that the lawn mower 1 can be switched between the grass collecting mode and the grass chopping mode.

[0037] The knob assembly 3 is used to drive the door assembly 2 to rotate relative to the communication opening 12 to cover or expose the communication opening 12 .

[0038] See also Figures 4 to 11 Combined with Figure 1As shown, the door assembly 2 is formed with a first curved surface 225 and a second curved surface 226 on the side facing the cutting assembly 4. When the door assembly 2 blocks the connecting port 12, the lawn mower 1 switches to the grass chopping mode. At this time, the first curved surface 225 is coplanar with the inner wall surface of the cutting chamber 11, and together constitutes a cavity for the cutting assembly 4 to rotate, so that the grass clippings cut by the cutting assembly 4 are discharged from the bottom of the casing 10 and cover the ground; when the door assembly 2 is rotated to expose the connecting port 12, the lawn mower 1 switches to the grass collecting mode. At this time, the second curved surface 226 is located in the grass collecting channel 13 and is coplanar with the inner wall surface of the grass collecting channel 13, so that the grass clippings cut by the cutting assembly 4 are guided into the grass collecting bag 5 through the connecting port 12, the second curved surface 226 and the grass collecting channel 13 to achieve bagging. The first curved surface 225 and the second curved surface 226 can respectively cooperate with the wall surface of the housing 10 when the lawn mower 1 switches to different modes, thereby more effectively processing the cut grass clippings.

[0039] The first curved surface 225 and the second curved surface 226 are vertically offset from each other, and at least one end of the first curved surface 225 and the second curved surface 226 share a common edge.

[0040] The first curved surface 225 is an arc surface, and the curvature radius of the first curved surface 225 is the same as the curvature radius of the inner wall surface of the cutting cavity 11; the second curved surface 226 is a single curved surface. In this way, it is ensured that the first curved surface 225 can completely fit with the inner wall surface of the cutting cavity 11, and the cavity formed thereby can ensure the rotation of the cutting assembly 4, and setting the second curved surface 226 as a single curved surface can avoid the accumulation of grass clippings when guiding grass clippings, which is more efficient.

[0041] In the vertical direction, the height of the first curved surface 225 is the same as that of the cutting assembly 4, and the second curved surface 226 is located above the cutting assembly 4. The two curved surfaces are arranged in an up-and-down offset manner to ensure that the cutting assembly 4 will not be affected by the second curved surface 226 when rotating. Of course, in other embodiments, the second curved surface 226 can also be arranged below the cutting assembly 4, and there is no limitation to this.

[0042] Preferably, in the vertical direction, the height of the first curved surface 225 accounts for one fifth to one quarter of the height of the second curved surface 226. This arrangement can maximize the guide area of ​​the second curved surface 226 in the grass collecting mode while ensuring the rotation of the cutting assembly 4, so as to improve the bagging efficiency. Of course, in other embodiments, there is no restriction on the height ratio of the first curved surface 225 to the second curved surface 226 in the vertical direction.

[0043] The housing 10 is provided with a through hole 101 for the door assembly 2 to pass through. The door assembly 2 is fixedly connected to the knob assembly 3 through the through hole 101 so as to rotate synchronously with the knob assembly 3. Specifically, the door assembly 2 includes a transmission shaft 21 and a stopper 22 connected to the transmission shaft 21. The transmission shaft 21 passes through the through hole 101 and is fixedly connected to the knob assembly 3. A first curved surface 225 and a second curved surface 226 are provided on the stopper 22. In other words, the transmission shaft 21 is fixed to one end of the communication port 12 and is fixedly connected to the knob assembly 3 through the through hole 101. When the knob assembly 3 is rotated, the transmission shaft 21 is driven to rotate synchronously. Driven by the transmission shaft 21, the stopper 22 can rotate relative to the communication port 12 so as to cover or expose the communication port 12.

[0044] Preferably, the knob assembly 3 is provided with a screw hole 315 at a position corresponding to the through hole 101, and a sleeve 28 is installed in the through hole 101 to fix the transmission shaft 21 passing through the through hole 101. When the knob assembly 3 is connected to the housing 10, the screw hole 315 and the transmission shaft 21 are aligned with each other. At this time, the screw 27 can be passed through the screw hole 315 and cooperated with the transmission shaft 21 to achieve a fixed connection between the transmission shaft 21 and the knob assembly.

[0045] The knob assembly 3 is fixed to the outside of the housing 10, and the door assembly 2 is fixed to one end of the communication port 12 and connected to the knob assembly 3. Specifically, the door assembly 2 can rotate relative to one end of the communication port 12 to cover or expose the communication port 12. In other embodiments, the knob assembly 3 can also be set inside the housing 10, and in this case, an operation port can be set on the housing 10 to expose the switch key of the knob assembly for driving control, which is not limited.

[0046] See also Figures 5 to 7 Combined with Fig.11 As shown, the knob assembly 3 includes a knob base 31, a knob cover 32 and a locking member 33, wherein the locking member 33 has a locked state and an activated state. When the locking member 33 is in the locked state, the knob assembly 3 cannot rotate. When the locking member 33 is in the activated state, the knob assembly 3 can rotate. The rotation axis of the locking member 33 is perpendicular to the rotation axis of the knob assembly 3.

[0047] Specifically, one end of the locking member 33 is accommodated in the storage cavity 30 between the knob base 31 and the knob cover 32, and the other end abuts against the outer wall surface of the housing 10 and rotates along the outer wall surface. The outer wall surface of the housing 10 is provided with at least two locking grooves 15 on the rotation path of the locking member 33. When the other end of the locking member 33 is accommodated in the locking groove 15, the locking member 33 is in a locked state, and the knob assembly 3 cannot rotate. When the knob cover 32 is pressed, one end of the locking member 33 moves toward the knob base 31, and the other end disengages from the locking groove 15. The locking member 33 is in an activated state, and the knob assembly 3 can rotate.

[0048] In this embodiment, a base 103 is fixed to the outside of the housing 10, and a slot 130 corresponding to the through hole 101 is provided on the base 103, so that a vertically through-connecting insertion cavity (not shown) is formed between the through hole 101 and the slot 130, and the transmission shaft 21 passes through the insertion cavity and is fixedly connected to the knob assembly 3, and the locking groove 15 is provided on the base 103. Of course, in other embodiments, the base 103 can be provided as an extension portion integrally formed with the housing 10, and this is not limited.

[0049] The locking member 33 is generally V-shaped, and includes a first locking arm 331, a second locking arm 332, and a connecting arm 333 connecting the first locking arm 331 and the second locking arm 332. The first locking arm 331 is received in the storage cavity 30 and abuts against the knob cover 32. The connecting arm 333 is connected to the knob base 31 through a rotating shaft 34. The second locking arm 332 is received in the locking groove 15. In other words, the locking member 33 is movably connected to the knob base 31. When the first locking arm 331 is pressed downward by the knob cover 32, the second locking arm 332 tilts upward and disengages from the locking groove 15. At this time, the knob assembly 3 is in a rotatable state. When the second locking arm 332 is received in the locking groove 15, the knob assembly 3 is in a locked state and cannot be rotated, and the door assembly 2 fixedly connected to the knob assembly 3 is also fixed accordingly. Preferably, the rotating shaft 34 is a screw, and the connecting arm 333 is fixedly connected to the knob base 31 through a nut and a screw.

[0050] The knob assembly 3 also includes an elastic member 35 disposed in the storage cavity 30. In the vertical direction, the first locking arm 331 is clamped by the knob cover 32 and the elastic member 35. When the knob cover 32 is pressed, the first locking arm 331 is pushed to compress the elastic member 35, and the second locking arm 332 tilts upward to disengage from the locking groove 15, and the rotating assembly 3 is in a rotatable state; after the pressure is released, the elastic member 35 drives the first locking arm 331 to reset, so that the second locking arm 332 is accommodated in the locking groove 15, and the knob assembly 3 is in a locked state. By introducing the elastic member 35, the elastic force of the elastic member 35 can be used to complete the rotation of the locking member 33, and then the mode switching of the lawn mower 1 is completed.

[0051] When in use, it is only necessary to continuously press the knob cover 32 and control the knob assembly 3 to rotate. When the second locking arm 332 moves to the corresponding locking groove 15, the knob cover 32 is released. Under the elastic force of the elastic member 35, the second locking arm 332 enters the locking groove 15 to lock, and the first locking arm 331 is tilted accordingly. Of course, in other embodiments, the elastic member 35 may not be used, but the second locking arm 332 may be pushed into the locking groove 15 by hand or other tools, which is not limited here.

[0052] The inner side wall of the knob cover 32 is provided with a positioning strip 327 protruding toward the first locking arm 331, and the first locking arm 331 is provided with a positioning groove 336 on the side facing the knob cover 32. The positioning strip 327 extends into the positioning groove 336 and abuts against the first locking arm 331 in real time. This arrangement, on the one hand, enables the first locking arm 331 to abut against the knob cover 32 when it is pressed down or tilted up, and will not slide or misalign. On the other hand, the positioning strip 327 protruding downward can ensure that the first locking arm 331 is pressed down a certain distance, so that the second locking arm 332 can smoothly escape from the locking groove 15 when it is tilted up.

[0053] The end of the knob base 31 away from the locking groove 15 is provided with a pin hole 317 and a pin shaft 318 passing through the pin hole 317, and the knob cover 32 is provided with a receiving groove (not shown) for receiving the pin shaft 318. A through hole 328 is provided on the side wall of the knob cover 32, and the through hole 328 is communicated with the receiving groove for the pin shaft 318 to pass through, so that the knob cover 32 is rotatably connected to the knob base 31. In other words, the knob cover 32 is arranged above the knob base 31, one end of the knob cover 32 is rotatably connected to the knob base 31, and the other end is used to receive the locking member 33, and the other end of the knob cover 32 can be tilted up when the first locking arm 331 tilts up.

[0054] The lawn mower 1 further comprises a guide plate 20 fixedly connected to the housing 10, the guide plate 20 being provided with a guide surface 201 and a through hole 202, the guide surface 201 being accommodated in the housing 10, the through hole 202 being exposed outside the housing 10, the transmission shaft 21 passing through the through hole 202 and being able to rotate along the guide surface 201. Optionally, the guide plate 20 is a guide structure integrally formed with the housing 10, the through hole 202 is provided on a protruding portion of the housing 10 protruding toward the knob assembly 3, and the guide surface 201 is an inner wall surface of the housing 10.

[0055] In this embodiment, the guide plate 20 is an independent structure, and one end of the guide plate 20 provided with a through hole 202 passes through the through hole 101 and exposes the through hole 202 to the outside of the housing 10. The guide surface 201 includes a first guide surface 2011 and a second guide surface 2012. The first guide surface 2011 is in contact with the inner wall surface of the cutting chamber 11 of the housing 10, and guides the cut grass clippings to rotate along the inner wall surface without affecting the rotation of the cutting assembly 4; the transmission shaft 21 is in contact with the second guide surface 2012 and can rotate along the second guide surface 2012. One end of the transmission shaft 21 passes through the through hole 101 and the through hole 202 at the same time to be exposed to the outside of the housing 10. The second guide surface 2012 is a semicircular arc surface, and the semicircular arc surface is directly opposite to the through hole 202.

[0056] The housing 10 is also provided with a positioning block 29 fixedly connected to the guide plate 20. One end of the transmission shaft 21 passes through the through hole 202 to be exposed outside the housing 10, and the other end is fixedly connected to the positioning block 29 to achieve a fixed connection between the door assembly 2 and the housing 10.

[0057] In this embodiment, the lawn mower 1 further comprises a rear baffle 6 fixedly connected to the housing 10, the positioning block 29 is fixed to the rear baffle 6, a prefabricated groove 291 is left on the positioning block 29, a corresponding prefabricated hole 203 is also provided at the bottom of the guide plate 20, and the rear baffle 6 is correspondingly provided with a prefabricated hole 61 and a fixing member 62 fixed in the prefabricated hole 61. When the rear baffle 6 is fixed to the housing 10, the prefabricated groove 291, the prefabricated hole 203 and the prefabricated hole 61 are aligned with each other, and at this time, the fixing member 62 can be used to simultaneously pass through the prefabricated groove 291, the prefabricated hole 203 and the prefabricated hole 61 to achieve the fixed connection of the rear baffle 6, the housing 10 and the guide plate 20.

[0058] See also Figures 1 to 3 Combined with Fig.12As shown, the cutting assembly 4 includes a motor 41 and a blade 42, the motor 41 is installed on the outside of the housing 10, the blade 42 is accommodated in the cutting chamber 11 and can rotate in the cutting chamber 11, and a hole (not shown) is left at the installation position of the motor 41 and the housing 10, and the motor 41 is connected to the blade 42 through the hole, so that the blade 42 can be driven to rotate by the motor 41.

[0059] See also Figures 1 to 3 Combined with Fig.12 As shown, the grass collecting bag 5 is detachably mounted on one end of the housing 10 away from the cutting chamber 11, wherein a buckle portion 14 is provided on the housing 10, and a matching portion 51 is correspondingly provided on the grass collecting bag 5, so that the grass collecting bag 5 and the housing 10 can be installed by utilizing the mutual cooperation between the buckle portion 14 and the matching portion 51.

[0060] In this embodiment, the buckle portion 14 is a circular convex strip, and the matching portion 51 is a matching groove, so that the circular convex strip can be accommodated in the matching groove to achieve the installation of the grass collecting bag 5 and the housing 10.

[0061] In summary, the lawn mower 1 of the present invention accommodates one end of the locking member 33 in the storage chamber 30 between the knob base 31 and the knob cover 32, and the other end abuts against the outer wall surface of the housing 10 and rotates along the outer wall surface, so that when the knob assembly 3 is rotated, the locking member 33 and the door assembly 2 fixedly connected to the knob assembly 3 can be driven to rotate synchronously, thereby avoiding the need to disassemble the door assembly 2. At the same time, by providing at least two locking grooves 15 on the housing 10, when the knob assembly 3 is rotated so that the locking member 33 is accommodated in different locking grooves 15, the door assembly 2 can be driven by the knob assembly 3 to rotate to different states, thereby realizing the switching between the grass collecting mode and the grass chopping mode, which is simple to operate and easy to use.

[0062] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A lawn mower having a grass cutting mode and a grass collecting mode, characterized in that: The lawn mower comprises: A casing, wherein the casing is formed with a cutting cavity and is also provided with a communication port; a door assembly, the door assembly being pivotally connected to the housing, and when the door assembly is in an open position, the cutting chamber is connected to the communication port, and the lawn mower is in a grass collecting mode; When the door assembly is in the closed position, the communication port is closed and the lawn mower is in a grass cutting mode; A knob assembly, the knob assembly being connected to the door assembly and capable of driving the door assembly to move when the knob assembly is rotated; Wherein, the knob assembly includes a locking member, which has a locked state and an activated state. When the locking member is in the locked state, the knob assembly cannot rotate, and when the locking member is in the activated state, the knob assembly can rotate, and the rotation axis of the locking member is perpendicular to the rotation axis of the knob assembly.

2. The lawn mower according to claim 1, characterized in that: The knob assembly comprises a knob base and a knob cover, one end of the locking member is received in a receiving cavity between the knob base and the knob cover, the other end of the locking member abuts against an outer wall surface of the housing and can rotate along the outer wall surface, the outer wall surface of the housing is provided with at least two locking grooves on a rotation path of the locking member, when the other end of the locking member is received in the locking groove, the locking member is in a locked state, and the knob assembly cannot rotate; When the knob cover is pressed, one end of the locking member moves toward the knob base, and the other end is disengaged from the locking groove, the locking member is in an activated state, and the knob assembly can rotate.

3. The lawn mower according to claim 2, characterized in that: The locking member is roughly V-shaped, and includes a first locking arm, a second locking arm, and a connecting arm connecting the first locking arm and the second locking arm. The first locking arm is accommodated in the storage cavity and abuts against the knob cover, the connecting arm is connected to the knob base via a rotating shaft, and the second locking arm is accommodated in the locking groove.

4. The lawn mower according to claim 3, characterized in that: The knob assembly further includes an elastic member disposed in the receiving cavity, wherein the first locking arm is clamped by the knob cover and the elastic member in the vertical direction, and when the knob cover is pressed, the first locking arm is pushed to compress the elastic member, and the second locking arm tilts upward to be out of the locking groove, and the knob assembly is in a rotatable state; After the pressure is released, the elastic member drives the first locking arm to return to its original position, the second locking arm is received in the locking groove, and the knob assembly is in a locked state.

5. The lawn mower according to claim 4, characterized in that: A positioning strip protruding toward the first locking arm is provided on the inner side wall of the knob cover, and a positioning groove is correspondingly recessed on the side of the first locking arm facing the knob cover. The positioning strip extends into the positioning groove and abuts against the first locking arm in real time.

6. The lawn mower according to claim 2, characterized in that: A positioning portion and a positioning shaft passing through the positioning portion are provided at one end of the knob base away from the locking groove, and the knob cover is provided with a receiving groove for accommodating the positioning portion. A through hole is opened on the side wall of the knob cover, and the through hole is connected to the receiving groove for the positioning shaft to pass through, so that the knob cover is rotatably connected to the knob base.

7. The lawn mower according to claim 6, characterized in that: The housing is provided with a through hole for the door assembly to pass through, and the door assembly passes through the through hole and is fixedly connected to the knob base so as to rotate synchronously with the knob assembly.

8. The lawn mower according to claim 7, characterized in that: The door assembly includes a transmission shaft and a stopper connected to the transmission shaft. The transmission shaft passes through the through hole and is fixedly connected to the knob base.

9. The lawn mower according to claim 8, characterized in that: The lawn mower further comprises a guide plate fixedly connected to the casing, the guide plate being provided with a guide surface and a through hole, the guide surface being accommodated in the casing, the through hole being exposed outside the casing, and the transmission shaft passing through the through hole and being able to rotate along the guide surface.

10. The lawn mower according to claim 9, characterized in that: The casing is also provided with a positioning block fixedly connected to the guide plate. One end of the transmission shaft passes through the through hole to be exposed outside the casing, and the other end is fixedly connected to the positioning block to achieve fixed connection between the door assembly and the casing.

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