CN218125532U

CN218125532U - Grass cutting head, operation head and grass cutting machine

Info

Publication number: CN218125532U
Application number: CN202222255450.8U
Authority: CN
Inventors: 刘通通; 王程杰; 操攀
Original assignee: Zhejiang Lera New Energy Power Technology Co Ltd
Current assignee: Zhejiang Lera New Energy Power Technology Co Ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2022-12-27
Anticipated expiration: 2032-08-25

Abstract

The utility model provides a grass cutting head, an operation head and a grass cutting machine. The head of beating the grass includes: a spool configured to wind a mowing cord; the head shell is provided with an outer threading hole for the grass beating rope to pass through; the spool is configured to move along a longitudinal axis and is configured to move between a first axial position and a second axial position; when the spool is located at the first axial position, the spool and the head shell synchronously rotate; when the spool is located at the second axial position, the spool is separated from the head shell, and under the action of the centrifugal force of the mowing rope, the head shell and the spool rotate relatively and the mowing rope is released from the mowing head. The utility model discloses a head of beating grass has the unwrapping wire mode, has replaced traditional manual unwrapping wire through automatic unwrapping wire, has realized the intellectuality of unwrapping wire to use manpower sparingly.

Description

Grass cutting head, operation head and grass cutting machine

Technical Field

The utility model relates to a weeding equipment especially relates to a grass cutting head, operation head and machine of beating grass.

Background

A grass trimmer is a device for cutting weeds. The grass trimmer comprises a grass trimming head, wherein a grass trimming rope is wound in the grass trimming head. Two ends of the grass mowing rope penetrate through the grass mowing head and are exposed out of the grass mowing head. When the grass cutting head works, the grass cutting head rotates at a high speed, at the moment, the grass cutting rope rotates at a high speed along with the grass cutting head, and in the process, the grass cutting rope rotating at a high speed impacts weeds and generates cutting force on the weeds, so that the weeds are cut.

According to the conventional grass mowing head, after the grass mowing rope is abraded, the length of the grass mowing rope exposed out of the grass mowing head is not enough to cut weeds, and the grass mowing work can be continued only by paying off. However, in the conventional grass trimmer head, a user needs to manually pay off the line, and the manual line paying off needs to be carried out in a state that the grass trimmer stops rotating. The manual paying-off mode is troublesome to operate and poor in user experience.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a grass cutting head, an operation head and a grass cutting machine, which can realize automatic line releasing.

A first aspect of embodiments of the present application provides a grass-mowing head, comprising:

a spool configured to wind a mowing cord;

the head shell is provided with an outer threading hole for the grass beating rope to pass through;

the spool is configured to move along a longitudinal axis and configured to move between a first axial position and a second axial position;

when the spool is located at the first axial position, the spool and the head shell synchronously rotate;

when the spool is located at the second axial position, the spool is separated from the head shell, and under the action of the centrifugal force of the grass cutting rope, the head shell and the spool rotate relatively and the grass cutting rope is released from the grass cutting head.

In one embodiment, the grass cutting head has a winding mode and a paying-off mode, in the winding mode, the spool rotates, the head shell is limited to rotate, in the paying-off mode, the spool is separated from the head shell, the spool and the head shell rotate in the same direction, and the rotating speed of the spool is lower than that of the head shell under the action of centrifugal force of the grass cutting rope.

In one embodiment, the grass mowing head further comprises a transmission part configured to drive the spool to synchronously rotate;

when the spool is located at the first axial position, the transmission piece abuts against the spool so as to drive the spool to rotate synchronously;

when the spool is in the second axial position, the spool is disengaged from the drive.

In one embodiment, the transmission member comprises a transmission portion, and the spool comprises a transmission cavity matched with the transmission portion;

when the bobbin is located at the first axial position, the transmission part is accommodated in the transmission cavity, and the outer wall surface of the transmission part is attached to the inner wall surface of the transmission cavity;

when the spool is located at the second axial position, at least part of the transmission part is far away from the transmission cavity, and the outer wall surface of the transmission part is separated from the inner wall surface of the transmission cavity.

In one embodiment, the transmission portion includes a first end portion and a second end portion which are oppositely arranged in a direction from the first axial position to the second axial position, and the direction from the first end portion to the second end portion is consistent with the direction from the first axial position to the second axial position;

the outer contour of the cross section of the first end portion is larger than the outer contour of the cross section of the second end portion.

In one embodiment, the outer contour of the cross-section of the transmission section decreases gradually in a direction from the first axial position to the second axial position.

In one embodiment, the grass cutting head comprises a first limiting bulge and a first limiting recess which are matched; one of the first limiting protrusion and the first limiting recess is arranged on the transmission part, and the other one of the first limiting protrusion and the first limiting recess is arranged on the transmission cavity;

when the spool is located at the first axial position, the first limiting protrusion is matched with the first limiting recess, and the transmission part drives the spool to rotate synchronously;

when the bobbin is located at the second axial position, the first limit protrusion is separated from the first limit recess.

In one embodiment, the head shell is configured to move along a longitudinal axis and is configured to move between a third axial position and a fourth axial position;

when the head shell is located at the third axial position, the spool abuts against the head shell so as to drive the head shell to rotate synchronously;

when the head housing is in the fourth axial position, the head housing is separated from the spool.

In one embodiment, the grass cutting head comprises a second limiting protrusion and a second limiting recess which are matched; one of the second limiting protrusion and the second limiting recess is arranged on the head shell, and the other of the second limiting protrusion and the second limiting recess is arranged on the bobbin;

when the head shell is located at the third axial position, the second limiting protrusion is matched with the second limiting recess, and the bobbin drives the head shell to rotate synchronously;

when the head shell is located at the fourth axial position, the second limiting protrusion is separated from the second limiting recess.

In one embodiment, the second limit projection comprises a first guide surface and a first stop surface; the first stop surface extends in a direction from the third axial position to the fourth axial position, the first stop surface being configured to limit rotation of the spool in a first rotational direction; the first guide surface comprises a connecting end and an extending end, the connecting end is connected with the first stopping surface, the direction from the connecting end to the extending end is directed, and the first guide surface is inclined;

the second limiting recess comprises a second guide surface and a second stop surface, the second guide surface is matched with the first guide surface, and the second stop surface is matched with the first stop surface;

when the head shell is located at the third axial position, the first guide surface abuts against the second guide surface, and the spool drives the head shell to rotate synchronously.

In one embodiment, the direction of inclination of the at least part of the structure of the first guide surface has a component in the direction of rotation of the spool.

In one embodiment, the grass mowing head further comprises a damping member splined with the head housing and configured to restrict rotation of the head housing;

the damping member is configured to have a stuck state and a rotating state, and when the damping member is in the stuck state, the damping member restricts the rotation of the head shell;

when the damping piece is in the rotating state, the head shell drives the damping piece to rotate synchronously.

In one embodiment, the grass cutting head further comprises a catch configured to limit rotation of the damper;

the damper is formed with an adapter opening adapted to the retainer, the retainer is configured to move between a first position and a second position, and when the retainer is located at the second position, the retainer is located in the adapter opening, the damper is restricted from rotating, and the damper is in the retained state.

In one embodiment, the grass cutting head further comprises a reset piece fixedly connected with the clamping stop piece and configured to drive the clamping stop piece to move from the second position to the first position.

A second aspect of embodiments of the present application provides a working head comprising the grass-mowing head as described above and a driving device configured to drive the grass-mowing head to rotate.

A third aspect of an embodiment of the present application provides a grass trimmer, which comprises the grass trimmer head and a driving device, wherein the driving device is configured to drive the grass trimmer head to rotate, and the grass trimmer further comprises an operating device, and the operating device is used for being operated by a user to control the grass trimmer.

The embodiment of the application achieves the main technical effects that:

the utility model discloses a head of beating grass can twine the rope release of beating grass to beating grass on the head automatically, has replaced traditional manual unwrapping wire through automatic unwrapping wire, has realized the intellectuality of unwrapping wire to use manpower sparingly.

Drawings

FIG. 1 is a schematic perspective view of the grass-mowing head after the grass-mowing cord is installed on the grass-mowing head in the embodiment;

FIG. 2 is a schematic cross-sectional view of the grass-mowing head in the winding mode of the present embodiment;

FIG. 3 is a schematic cross-sectional view of the grass-mowing head in the line-laying mode of the present embodiment;

FIG. 4 is a schematic cross-sectional view of the grass cutting head in the grass cutting mode of the present embodiment;

FIG. 5 is a schematic perspective view of the head housing of the present embodiment;

FIG. 6 is a perspective view of the upper case of the present embodiment;

FIG. 7 is another perspective view of the upper shell of the present embodiment;

FIG. 8 is a perspective view of the bobbin in the present embodiment;

FIG. 9 is a schematic plan view of the spool in the present embodiment;

FIG. 10 is another schematic plan view of the bobbin in the present embodiment;

FIG. 11 is a perspective view of the damper according to the present embodiment;

FIG. 12 is a schematic plan view showing the structure of the damper according to the present embodiment;

FIG. 13 is a schematic perspective view of the push button of the present embodiment;

FIG. 14 is a schematic plan view of the push button of the present embodiment;

FIG. 15 is a schematic perspective view of a transmission member according to the present embodiment;

FIG. 16 is a schematic plan view of the transmission member of the present embodiment.

Description of the reference numerals

The grass cutting head 1, the grass cutting rope 2, the driving device 10, the spool 20, the inner threading hole 21, the second limit protrusion 22, the first stop surface 221, the first guide surface 222, the connecting end 2221, the extending end 2222, the first axial position 23, the second axial position 24, the first limit recess 25, the transmission cavity 26, the head shell 30, the outer threading hole 31, the upper shell 32, the lower shell 33, the third axial position 34, the fourth axial position 35, the second limit recess 36, the second stop surface 361 second guide surface 362, spring 40, damping member 50, external spline 51, fitting opening 52, clamping member 60, reset member 70, winding switch 80, button 90, first part 91, first surface 911, second part 92, second surface 921, knocking cap 100, transmission member 200, transmission member 210, first limit projection 211, first end part 212, second end part 213, protection cover 300, longitudinal axis 1a, included angle alpha, winding mode A, line releasing mode B, grass beating mode C

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The manner in which the following exemplary embodiments are described does not represent all manner of consistency with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Similarly, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one, and if only "a" or "an" is denoted individually. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

A grass trimmer is equipment for cutting weeds and is mainly applied to scenes such as lawn mowing, garden mowing and the like.

As shown in fig. 1, the grass trimmer comprises a grass trimming head 1, wherein a grass trimming rope 2 is wound in the grass trimming head 1, and two ends of the grass trimming rope 2 penetrate through the grass trimming head 1 and are exposed out of the grass trimming head 1. When the grass cutting head 1 works, the grass cutting head rotates at a high speed, and at the moment, the grass cutting rope 2 rotates at a high speed along with the grass cutting head 1. In this process, the grass cutting ropes 2 rotating at a high speed strike weeds and generate cutting force to the weeds, thereby achieving cutting of the weeds.

As shown in fig. 4, the grass trimmer head 1 includes a spool 20, a head housing 30, and a driving device 10. Wherein the drive device 10 is connected to the spool 20 and is configured to drive the spool 20 in rotation about the longitudinal axis 1 a. The spool 20 is sleeved outside the driving device 10. The spool 20 is formed with an inner threading hole 21 for the grass-mowing cord 2 to pass through, and the inner threading hole 21 is used for fixing the grass-mowing cord 2. The number of the inner threading holes 21 is even. The grass cord 2 traverses the spool 20 through the inner threading hole 21, and the inner threading hole 21 serves as a fixing point so that the grass cord 2 can be wound on the spool 20. The head housing 30 is disposed outside the bobbin 20 and is carried by the bobbin 20, in other words, the head housing 30 is rotatable together with the bobbin 20 about the longitudinal axis 1 a. The head shell 30 is formed with outer threading holes 31 for the grass rope 2 to pass through, and the number of the outer threading holes 31 is even. Both ends of the grass mowing cord 2 wound around the spool 20 penetrate out of the head casing 30 through the outer threading holes 31 and are exposed out of the head casing 30. Further, as shown in fig. 5, the head housing 30 includes an upper housing 32 and a lower housing 33, which are configured to be easily disassembled and assembled, thereby facilitating the assembly of the spool 20 in the head housing 30. The present application does not limit the shape and configuration of the head housing 30 as long as it enables assembly of the grass trimmer head 1.

As shown in fig. 1, the grass cutting head 1 further comprises a protective cover 300, and the protective cover 300 is used for preventing the grass cutting rope 2 from hurting a user.

In the above arrangement, when the grass cutting head 1 is in operation, the driving device 10 drives the spool 20 to rotate at a high speed, and at the same time, the spool 20 drives the head shell 30 and the grass cutting rope 2 to rotate together at a high speed.

In one design, when a user desires to install the cord 2 to the grass cutting head 1, the upper and

lower housings

32, 33 are first disassembled and the spool 20 is removed. The user then manually winds the grass cutting line 2 around the spool 20, and places the spool 20 in the head housing 30 in a position such that the two ends of the grass cutting head 1 pass through the outer threading holes 31 of the head housing 30. Finally, the upper shell 32 and the lower shell 33 are assembled to complete the installation of the grass mowing rope 2 and the grass mowing head 1.

In this design, the user needs to manually mount the grass cutting rope 2 on the grass cutting head 1, and the process is troublesome to operate and wastes time and labor. In addition, after the grass mowing rope 2 is worn, the length of the grass mowing rope 2 exposed out of the grass mowing head 1 is not enough to cut weeds, and the grass mowing work can be continued only by paying off. However, in the conventional grass trimmer head 1, the user needs to manually pay off the line, and the manual line paying off needs to be performed in a state that the grass trimmer is stopped. The manual paying-off mode is troublesome to operate and poor in user experience.

In this application, the grass-mowing head 1 can automatically wind and pay off, and the grass-mowing head 1 is provided with a winding mode A and a paying off mode B.

The specific principle of automatic winding is that, when the user needs to supply new grass mowing rope 2, the user can align the inner threading hole 21 and the outer threading hole 31, then the grass mowing rope 2 passes through the outer threading hole 31 and then enters the inner threading hole 21, at the moment, as long as the relative movement between the bobbin 20 and the head shell 30 can be realized, the limiting effect of the outer threading hole 31 on the grass mowing rope 2 can lead the grass mowing rope 2 to be gradually wound on the bobbin 20 along with the movement of the outer threading hole 31 relative to the bobbin 20. In the present embodiment, in the winding mode a, the driving device 10 drives the spool 20 to rotate, the head housing 30 is restricted from rotating, so that relative movement occurs between the spool 20 and the head housing 30, and the grass cutting head 1 performs automatic winding.

The principle of automatic paying-off is that the paying-off process is opposite to the winding process. In the present embodiment, the rotation speed of the spool 20 is greater than that of the head housing 30 at the time of automatic winding, and therefore, the rotation speed of the spool 20 is less than that of the head housing 30 during the unwinding. In the pay-off mode B, the spool 20 is separated from both the driving device 10 and the head housing 30. Then, the spool 20 and the head shell 30 keep rotating in the same direction under the action of inertia, and the rotating speed of the spool 20 is less than that of the head shell 30 under the action of the centrifugal force of the grass mowing rope 2, so that the grass mowing head 1 performs automatic line releasing.

In addition, the grass cutting head 1 also has a grass cutting mode C. In the grass mowing mode C, the driving device 10 drives the spool 20 to rotate, and at the same time, the spool 20 drives the head housing 30 and the grass mowing cord 2 to rotate together at a high speed.

The application realizes the automatic winding of the grass mowing head 1 by the inclined plane matching between the wire shaft 20 and the head shell 30 and the arrangement of the damping piece 50. The head housing 30 is both relatively rotatable with respect to the spool 20 and the head housing 30 is also relatively slidable with respect to the spool 20 along the longitudinal axis 1a, wherein the head housing 30 is configured to move between a third axial position 34 and a fourth axial position 35.

Specifically, referring to fig. 5 to 10, the head housing 30 is provided with a second limiting recess 36, and the bobbin 20 is provided with a second limiting protrusion 22 matching with the second limiting recess 36. The grass-mowing head 1 further comprises a spring 40 which exerts a force between the head casing 30 and the spool 20. One end of the spring 40 is connected to the head housing 30 and the other end is connected to the bobbin 20, and the spring 40 applies a force to bring the bobbin 20 close to the upper cover. When the head shell 30 is located at the third axial position 34, the second limiting protrusion 22 fits into the second limiting recess 36, and under the action of the spring 40, the second limiting protrusion 22 tightly abuts against the second limiting recess 36, and the spool 20 drives the head shell 30 to rotate synchronously. When the head housing 30 is located at the fourth axial position 35, the second stopper protrusion 22 is separated from the second stopper recess 36, so that the head housing 30 is separated from the spool 20. Of course, in other embodiments, it is also possible that the head housing 30 is provided with the second limiting projection 22, and the bobbin 20 is provided with the second limiting recess 36, as long as one of the second limiting projection 22 and the second limiting recess 36 is provided on the head housing 30, and the other one of the second limiting projection 22 and the second limiting recess 36 is provided on the bobbin 20.

It should be noted that the number of the second limiting protrusions 22 corresponds to the number of the inner threading holes 21, and the number of the inner threading holes 21 is even. Likewise, the number of the second limiting recesses 36 corresponds to the number of the inner threading holes 21. In the present embodiment, the bobbin 20 is formed with six inner threading holes 21, and the number of the second stopper recesses 36 and the second stopper protrusions 22 is also six. Of course, in other embodiments, the numbers of the inner threading holes 21, the second limiting protrusions 22 and the second limiting recesses 36 may be other values as long as the numbers thereof correspond.

Further, the head housing 30 described above is movable between a third axial position 34 and a fourth axial position 35, it being understood that the head housing 30 is movable between the third axial position 34 and the fourth axial position 35 relative to the spool 20.

As shown in fig. 8 and 9, the second stopper protrusion 22 includes a first stopper surface 221 and a first guide surface 222. Wherein the first stop surface 221 extends in a direction pointing from the third axial position 34 to the fourth axial position 35. When the head housing 30 is located at the third axial position 34, the first stop surface 221 abuts against the second limit recess 36 to limit the rotation of the spool 20 in the first rotational direction. The first guide surface 222 includes a connection end 2221 and an extension end 2222, and the connection end 2221 is connected to the first stop surface 221. The first guide surface 222 is inclined in a direction from the connection end 2221 toward the extension end 2222, and the inclined direction of at least a partial structure of the first guide surface 222 has a component in the rotational direction of the spool 20. When the head housing 30 is located at the third axial position 34, the first guiding surface 222 abuts against the second limiting recess 36, and the spool 20 drives the head housing 30 to rotate synchronously under the abutting force. With this arrangement, the first guide surface 222 can more easily bring the second stopper recess 36 into rotation when the second stopper protrusion 22 is rotated.

In the present embodiment, the first stop surface 221 and the first guide surface 222 of the first stopper protrusion 211 exhibit a trapezoidal shape. Of course, in other embodiments, the first stop surface 221 and the first guide surface 222 may also have other shapes such as a V shape, as long as they can limit the rotation of the spool 20 in the first rotation direction and can drive the second limiting recess 36 to rotate.

As shown in fig. 7, the second limiting recess 36 includes a second guide surface 362 and a second stop surface 361. The second guiding surface 362 is matched with the first guiding surface 222, and when the head housing 30 is located at the third axial position 34, the first guiding surface 222 abuts against the second guiding surface 362, so that the spool 20 drives the head housing 30 to rotate synchronously. The second stop surface 361 is adapted to the first stop surface 221, and when the head housing 30 is located at the third axial position 34, the second stop surface 361 abuts or pushes against the first stop surface 221, so that the first stop surface 221 is limited from rotating in the first rotation direction.

It should be noted that, in the present application, the first rotation direction is opposite to the direction in which the spool 20 rotates about the longitudinal axis 1a when the driving device 10 drives the spool 20 to rotate.

The grass trimmer head 1 further includes a damper 50, the damper 50 being spline-coupled to the head housing 30 and configured to restrict rotation of the head housing 30. As shown in fig. 2 to 4 and fig. 11 and 12, the head shell 30 is sleeved on the damper 50, the damper 50 is provided with an external spline 51, and the head shell 30 is provided with an internal spline adapted to the external spline 51. The damper 50 is arranged to have a locked state and a rotated state. When the damping member 50 is in a rotating state, the inner spline is adapted to the outer spline 51, and the head shell 30 drives the damping member 50 to rotate synchronously. When the damper 50 is in the locked state, the internal spline and the external spline 51 abut against each other, and the damper 50 restricts the rotation of the head shell 30. At this time, since the first guide surface 222 and the second guide surface 362 are in a slope fit, and the inclined direction of at least a part of the structure of the first guide surface 222 has a component in the rotational direction of the spool 20, the first guide surface 222 pushes against the second guide surface 362, so that the head housing 30 has a tendency to rotate relative to the spool 20. When the head housing 30 is subjected to a force in the direction of the longitudinal axis 1a sufficient to overcome the elastic force of the spring 40, the first guide surface 222 passes over the second guide surface 362, and in the process, the head housing 30 is moved upward in the vertical direction and moved from the third axial position 34 to the fourth axial position 35, so that the second limit projection 22 is disengaged from the second limit recess 36, and the head housing 30 and the spool 20 can be relatively rotated. Immediately after the head shell 30 moves to the fourth axial position 35, it returns to the third axial position 34 under the influence of gravity.

Of course, in other embodiments, the head shell 30 may be provided with the external splines 51, and the damping member 50 may be provided with the internal splines, as long as the head shell 30 and the damping member 50 are in spline coupling.

As shown in fig. 2 to 4, the grass cutting head 1 further includes a stopper 60, the stopper 60 being configured to restrict the rotation of the damper 50. The damper 50 is formed with an fitting opening 52 that fits the retainer 60. The grip 60 is configured to move between a first position and a second position, when the grip 60 is in the second position, the grip 60 is positioned within the fitting opening 52 and abuts the damper 50. Since the latch 60 is in the fixed position, the damper 50 cannot rotate relative to the latch 60 by the abutting force of the latch 60, and the damper 50 is in the latched state. The present application realizes the separation of the head housing 30 from the bobbin 20 by limiting the rotation of the damper 50 by providing the locking piece 60.

In the present embodiment, the damper 50 has four fitting openings 52. By providing a plurality of adapter openings 52, grips 60 are more easily advanced into adapter openings 52. Of course, in other embodiments, the number of fitting openings 52 may be other values.

As shown in fig. 2 to 4, the grass-mowing head 1 further comprises a resetting member 70, wherein the resetting member 70 is fixedly connected with the locking member 60 and configured to drive the locking member 60 to move from the second position to the first position. When the retainer 60 moves from the first position to the second position, the restoring member 70 is elastically deformed, or the amount of deformation of the restoring member 70 becomes large, so that when the retainer 60 is located at the second position, the restoring member 70 applies a restoring force to the retainer 60 so that the retainer 60 can be automatically restored from the second position to the first position.

It should be noted that the grip 60 is movable between a first position and a second position, and it should be understood that the grip 60 is movable between a first position and a second position relative to the dampener 50.

In some embodiments, grips 60 may be movable only between a first position and a second position. In other words, the first position and the second position are two extreme positions of movement of the retainer 60. In other embodiments, the second position is not the limit position of the catch 60, and the catch 60 can continue to move in a direction from the first position to the second position and further into the fitting opening 52 until it moves to its limit position.

As shown in fig. 2 to 4, the grass trimmer head 1 includes a grass trimmer switch (not shown) and a winding switch 80. Wherein, in the grass mowing mode C, the grass mowing head 1 runs at a first running speed. The grass-mowing switch is configured to rotate the grass-mowing head 1 at a first operating speed when the grass-mowing switch is turned on. In the winding mode A, the grass mowing head 1 runs at a second running speed. The winding switch 80 is configured such that the grass-mowing head 1 rotates at the second operating speed when turned on. In the present application, in order to reduce the space occupied by the winding switch 80, the winding switch 80 is disposed obliquely.

In the embodiment, in the grass cutting mode C, the grass cutting ropes 2 exposed from the grass cutting head 1 need to rotate at a high speed to generate a sufficient cutting force to cut weeds. However, in the winding mode a, the spool 20 rotates too fast to facilitate the winding of the grass-mowing head 1. The second operating speed is therefore lower than the first operating speed.

As shown in fig. 2 to 4 and 13 and 14, grass-mowing head 1 further comprises a push-button 90, push-button 90 being configured to move between a starting position and an end position, end position being close to catch 60 with respect to the starting position. The button 90 includes a first portion 91 and a second portion 92, wherein the first portion 91 is configured to push against and open the winding switch 80. When the user presses the button 90 and moves the button 90 from the starting position to the ending position, in the process, the first portion 91 moves towards the winding switch 80 until the winding switch 80 is pushed and opened, the grass-mowing head 1 is in the winding mode a, and the spool 20 rotates at the second operating speed. Second portion 92 is configured to push against catch 60 such that catch 60 moves from the first position to the second position. During the movement of the push button 90 from the initial position to the final position, the second portion 92 moves in a direction approaching the retainer 60 until pushing against the retainer 60 and moving the retainer 60 from the first position to the second position, so that the retainer 60 is located in the fitting opening 52 and abuts against the damper 50, and the damper 50 is in a retained state. With such a design, the present application can turn on the winding switch 80 and simultaneously lock the damper 50 to restrict the rotation of the head shell 30.

In the above device, the first portion 91 includes a first surface 911, and the first surface 911 is configured to push against and open the winding switch 80. During the movement of the button 90 from the starting position to the ending position, the first surface 911 moves toward the proximity of the winding switch 80 until it pushes against and turns on the winding switch 80. Second portion 92 includes a second surface 921, second surface 921 being configured to push against catch 60, catch 60 moving from the first position to the second position. During movement of button 90 from the start position to the end position, second surface 921 moves in a direction approaching catch 60 until pushing against catch 60 and moving catch 60 from the first position to the second position. In the present embodiment, since the winding switch 80 is disposed obliquely, the first surface 911 and the second surface 921 form an included angle α. In the actual design process, the designer can correspondingly design the size of the included angle α according to the inclination angle of the winding switch 80.

It should be noted that the push button 90 is movable between a start position and an end position, and it should be understood that the push button 90 is movable between the start position and the end position relative to the winding switch 80. The start and end positions are the two extreme positions of movement of the push button 90 relative to the winding switch 80.

The automatic winding process of the grass mowing head 1 is as follows: first, in the initial state, the inner threading holes 21 and the outer threading holes 31 of the grass mowing head 1 are aligned, the grass mowing cord 2 is passed through the outer threading holes 31 and then enters the inner threading holes 21, so that the grass mowing cord 2 traverses the grass mowing head 1, and both ends of the grass mowing cord 2 respectively protrude from the two outer threading holes 31. The user then holds down button 90 and moves button 90 from the start position to the end position. In the process, the first surface 911 moves towards the winding switch 80 until the winding switch 80 is pushed and opened, and the grass-mowing head 1 is in the winding mode a, at which time the driving device 10 drives the spool 20 to rotate at the second operating speed. At the same time, the second surface 921 moves in a direction to approach the retainer 60 until pushing against the retainer 60 and moving the retainer 60 from the first position to the second position, so that the retainer 60 is located in the fitting opening 52 and abuts against the damper 50, the damper 50 being in a retained state and restricting the rotation of the head shell 30. Thereafter, the

head housings

30 and 20 are relatively rotated, the spool 20 is rotated at the second operating speed, and the head housing 30 is restricted from rotation by the damper member 50 and is moved back and forth between the third axial position 34 and the fourth axial position. The limiting effect of the outer threading hole 31 on the grass mowing rope 2 can lead the grass mowing rope 2 to gradually wind the grass mowing rope 2 on the spool 20 along with the movement of the outer threading hole 31 relative to the spool 20. Thus, in the winding mode a, the user can automatically wind the grass mowing head 1 by pressing the button 90, so that the user is not required to manually mount the grass mowing rope 2 on the grass mowing head 1.

The paying-off process of the grass cutting head 1 is opposite to the winding process. When the operating speed of the spool 20 is lower than that of the head housing 30, the grass-mowing head 1 can realize automatic line laying. In order to achieve a lower operating speed of the spool 20 than the head housing 30, the present application is designed such that the spool 20 is separated from both the driving device 10 and the head housing 30. Under the action of inertia, the spool 20 and the head shell 30 keep rotating in the same direction, and under the action of centrifugal force of the grass mowing rope 2, the rotating speed of the spool 20 is lower than that of the head shell 30, so that the grass mowing head 1 performs automatic line releasing.

The present application accomplishes the separation between the spool 20 and the drive device 10 by designing the transmission 200.

As shown in fig. 2 to 4, the grass-mowing head 1 further comprises a knocking cap 100. The knocking cap 100 and the head shell 30 move synchronously in the direction of the longitudinal axis 1a, in other words, the position of the knocking cap 100 is changed, and the head shell 30 can move together, that is, the head shell 30 changes the axial position due to the knocking cap 100. During the movement of the head housing 30 along the longitudinal axis 1a, after the head housing 30 is moved to a certain position, the head housing 30 is separated from the bobbin 20.

As shown in fig. 2 to 4, the grass-mowing head 1 further comprises a transmission member 200, the transmission member 200 is fixedly connected to the driving device 10, and the transmission member 200 is configured to drive the spool 20 to rotate synchronously. By providing the transmission member 200, the separation of the driving device 10 from the bobbin 20 can be achieved.

In actual operation, after the bobbin 20 is separated from the head housing 30, the bobbin 20 can move along the longitudinal axis 1a under the action of the transmission member 200. When the spool 20 is in the first axial position 23, the transmission member 200 abuts against the spool 20 to drive the spool 20 to rotate synchronously; when spool 20 is in second axial position 24, spool 20 is separated from transmission 200.

It should be noted that the spool 20 described above is movable between a first axial position 23 and a second axial position 24, and it should be understood that the spool 20 is movable between the first axial position 23 and the second axial position 24 relative to the transmission member 200.

In some embodiments, the spool 20 is only movable between the first axial position 23 and the second axial position 24. In other words, the first axial position 23 and the second axial position 24 are the two extreme positions of movement of the spool 20. When the spool 20 is moved to the second axial position 24, the spool 20 is no longer moved in a direction pointing towards the second axial position 24 towards the first axial position 23.

In other embodiments, the second axial position 24 is not an extreme position of the spool 20. The spool 20 will move first from the first axial position 23 to the second axial position 24 and further in a direction from the first axial position 23 towards the second axial position 24 until the extreme position is reached.

Specifically, referring to fig. 15 and 16, the driving member 200 includes a driving portion 210, and the driving portion 210 is provided with a first limiting protrusion 211. The bobbin 20 includes a transmission cavity 26 adapted to the transmission portion 210, and an inner wall surface of the transmission cavity 26 is provided with a first limiting recess 25 adapted to the first limiting protrusion 211. When the bobbin 20 is located at the first axial position 23, the transmission portion 210 is accommodated in the transmission cavity 26, an outer wall surface of the transmission portion 210 is attached to an inner wall surface of the transmission cavity 26, and the first limiting protrusion 211 is adapted to the first limiting recess 25, so that when the driving device 10 drives the transmission portion 210 to rotate, the transmission portion 210 drives the bobbin 20 to rotate synchronously. When the bobbin 20 is located at the second axial position 24, at least a portion of the transmission part 210 is away from the transmission cavity 26, and the outer wall surface of the transmission part 210 is separated from the inner wall surface of the transmission cavity 26, and the first limit protrusion 211 is separated from the first limit recess 25, so that the bobbin 20 is separated from the transmission member 200. Of course, in other embodiments, it is also possible that the bobbin 20 is provided with the first limiting protrusion 211, and the transmission member 200 is provided with the first limiting recess 25, as long as one of the first limiting protrusion 211 and the first limiting recess 25 is provided on the bobbin 20, and the other one of the first limiting protrusion 211 and the first limiting recess 25 is provided on the transmission member 200.

As shown in fig. 15 and 16, the transmission portion 210 includes a first end portion 212 and a second end portion 213 which are oppositely disposed in a direction from the first axial position 23 to the second axial position 24, and the direction from the first end portion 212 to the second end portion 213 is identical to the direction from the first axial position 23 to the second axial position 24. Wherein the outer contour of the cross-section of the first end portion 212 is larger than the outer contour of the cross-section of the second end portion 213. With this design, the spool 20 can be disengaged from the transmission 210 when the spool 20 is moved to the second axial position 24.

In one embodiment, at least part of the cross-sectional outer profile of the transmission part 210 may remain unchanged from the first axial position 23 in the direction towards the second axial position 24. In other words, the outer contour of the cross section of the transmission part 210 from the first end part 212 to the second end part 213 can be kept constant, or reduced and kept constant, as long as the outer contour of the cross section of the first end part 212 is larger than the outer contour of the cross section of the second end part 213.

As shown in fig. 15 and 16, in the present embodiment, the outer profile of the cross section of the transmission part 210 gradually decreases from the first axial position 23 toward the second axial position 24. By such a design of "big end down", the spool 20 can be separated from the transmission part 210 only by a small displacement in the direction from the first axial position to the second axial position 24, thereby facilitating the separation of the transmission part 210 from the spool 20.

The automatic line laying process of the grass mowing head 1 is as follows: in the grass mowing mode C, the user knocks the knocking cap 100, the knocking cap 100 is contacted with the ground, so that the head shell 30 moves along the longitudinal axis 1a, the second limiting recess 36 is separated from the second limiting protrusion 22, the head shell 30 is separated from the spool 20, and the head shell 30 and the spool 20 can rotate relatively. The spool 20 can then be moved along the longitudinal axis 1a by the action of the transmission member 200. When the spool 20 is moved to the second axial position 24, the spool 20 is disconnected from the drive device 10 and relative rotation of the spool 20 and the drive device 10 may occur. When the bobbin 20, the head housing 30 and the driving device 10 are all separated, the head housing 30 and the bobbin 20 keep rotating in the same direction under the action of inertia. However, the rotation speed of the spool 20 is lower than that of the head housing 30 under the centrifugal force of the grass cord 2, so that the grass-mowing head 1 wound on the spool 20 is released partially out of the head housing 30, and the grass-mowing head 1 is in the line-releasing mode B. Thus, in the grass mowing mode C, the user can discharge a proper amount of the grass mowing cord 2 by knocking the knocking cap 100, so that the user does not need to stop the grass mower and manually pay out the grass.

The utility model discloses a head of beating grass has wire winding mode and unwrapping wire mode, has replaced traditional manual wire winding and manual unwrapping wire through automatic wire winding and automatic unwrapping wire, has realized the intellectuality of wire winding and unwrapping wire to use manpower sparingly. In addition, in the device, the driving device does not need to rotate forwards and backwards, but only needs to rotate towards one direction to realize automatic winding and automatic paying-off. Therefore, the problem that the nut is not flexible can not appear in this application, more need not add the resistant glue that falls that is used for fastening nut.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A grass-mowing head, characterized in that it comprises:

a spool configured to wind a mowing cord;

the spool is configured to move along a longitudinal axis and is configured to move between a first axial position and a second axial position;

2. The grass mowing head according to claim 1, wherein the grass mowing head has a winding mode in which the spool rotates and the head housing is restricted from rotating, and a line releasing mode in which the spool is separated from the head housing, the spool and the head housing are kept rotating in the same direction, and the rotational speed of the spool is lower than that of the head housing by the centrifugal force of the grass mowing cord.

3. The grass-mowing head according to claim 2, further comprising a transmission configured to rotate the spool synchronously;

when the spool is in the second axial position, the spool is disengaged from the drive member.

4. Grass-mowing head according to claim 3, wherein the transmission comprises a transmission part, the spool comprising a transmission chamber adapted to the transmission part;

5. Grass-mowing head according to claim 4, characterized in that the transmission comprises a first end and a second end arranged opposite one another in a direction pointing from the first axial position to the second axial position, the direction pointing from the first end to the second end coinciding with the direction pointing from the first axial position to the second axial position;

6. Grass-mowing head according to claim 5, characterized in that the outer contour of the cross section of the transmission is gradually reduced in a direction from the first axial position to the second axial position.

7. The grass-mowing head according to claim 4, wherein the grass-mowing head comprises a first limiting projection and a first limiting recess which are matched; one of the first limiting protrusion and the first limiting recess is arranged on the transmission part, and the other of the first limiting protrusion and the first limiting recess is arranged on the transmission cavity;

8. The grass-mowing head according to claim 1, wherein the head casing is configured to move along the longitudinal axis and is configured to move between a third axial position and a fourth axial position;

9. The grass-mowing head according to claim 8, wherein the grass-mowing head comprises a second limiting protrusion and a second limiting recess which are matched with each other; one of the second limiting protrusion and the second limiting recess is arranged on the head shell, and the other of the second limiting protrusion and the second limiting recess is arranged on the bobbin;

10. The grass-mowing head according to claim 9, wherein the second limiting projection comprises a first guide surface and a first stop surface; the first stop surface extends in a direction from the third axial position to the fourth axial position, the first stop surface being configured to limit rotation of the spool in a first rotational direction; the first guide surface comprises a connecting end and an extending end, the connecting end is connected with the first stopping surface, the direction from the connecting end to the extending end is directed, and the first guide surface is inclined;

when the head shell is located at the third axial position, the first guide surface abuts against the second guide surface, and the spool drives the head shell to synchronously rotate.

11. Grass-mowing head according to claim 10, characterized in that the direction of inclination of the at least partial structure of the first guide surface has a component in the direction of rotation of the spool.

12. The grass mowing head according to claim 11, further comprising a damping member splined to the head housing and configured to restrict rotation of the head housing;

13. The grass-mowing head according to claim 12, further comprising a catch configured to limit rotation of the damper;

14. The grass-mowing head according to claim 13, further comprising a reset member fixedly connected to the latch and configured to move the latch from the second position to the first position.

15. A working head comprising a grass-mowing head according to any one of claims 1 to 14, and a driving device configured to drive the grass-mowing head to rotate.

16. A lawnmower comprising a grass-mowing head according to any one of claims 1 to 14, and a drive configured to drive the grass-mowing head in rotation, the lawnmower further comprising an operating device for operation by a user to control the lawnmower.