CN209845727U

CN209845727U - Grass mowing head and grass mowing machine

Info

Publication number: CN209845727U
Application number: CN201920295734.5U
Authority: CN
Inventors: 戚邦彦
Original assignee: Bao Shi De Technology China Co ltd
Current assignee: Bao Shi De Technology China Co ltd
Priority date: 2019-03-08
Filing date: 2019-03-08
Publication date: 2019-12-27
Anticipated expiration: 2029-03-08
Also published as: WO2020182073A1

Abstract

The utility model relates to a grass cutting head and grass cutting machine. Should beat the grass head includes: a housing; the knocking head comprises a knocking head body; the knocking head body is arranged in the accommodating cavity and can synchronously rotate along with the shell; the percussion head body is configured to operatively move in the direction of the rotational axis of the housing, and the percussion head body is connectable to or separable from the housing during movement of the percussion head body in the direction of the rotational axis of the housing; the wire spool comprises a wire spool body and an operation part; the wire spool body is arranged in the accommodating cavity and can synchronously rotate along with the knocking head body; the operating part penetrates out of the shell, and when the operating part is screwed, the wire spool body and the knocking head can be driven to rotate relative to the shell. So, strike the unwrapping wire in-process, on the rotation axis direction along the casing, only strike the position of head and change, and the position of wire reel body for the wire hole keeps unchangeable, and then has promoted unwrapping wire stability, is difficult to appear the card line phenomenon.

Description

Grass mowing head and grass mowing machine

Technical Field

The utility model relates to a garden instrument especially relates to a grass cutting head and grass cutting machine.

Background

The grass trimmer is popular with more and more users as a garden tool for trimming turf, and is widely applied to trimming turf in golf courses, football fields, manholes, courtyards and the like. Typically, a lawnmower includes a grass cutting head and a motor for driving the grass cutting head to rotate. The grass mowing head comprises a shell and a wire spool arranged in a containing cavity of the shell, and the grass mowing line is wound on the wire spool and penetrates out of the shell. When the grass mowing machine works, the motor drives the grass mowing head to rotate, so that the grass mowing line is driven to synchronously rotate, and grass mowing is achieved.

The grass mowing line rotates to mow grass, so that the tail end of the grass mowing line is easy to wear, the worn grass mowing line cannot reach the required grass mowing radius, and the grass mowing efficiency is greatly reduced. Therefore, the grass trimmer is provided with a paying-off mechanism so as to adjust the length of the grass trimming line penetrating out of the shell at a proper time.

To knocking type unwrapping wire machine of beating grass, when the unwrapping wire, strike through strikeing the head subaerial, make wire reel and casing break away from the cooperation and produce relative rotation to realize the unwrapping wire. However, the traditional knocking type grass mower has poor paying-off stability and is easy to cause the phenomenon of wire clamping in the paying-off process.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a grass trimmer head and a grass trimmer which can overcome the above-mentioned defects in order to solve the problems of the conventional grass trimmer that the stability of the line laying is poor and the line clamping phenomenon is easy to occur.

The head of beating the grass includes:

the shell is provided with an accommodating cavity and a line outlet hole for the grass mowing line to pass through from the accommodating cavity;

the knocking head comprises a knocking head body, and the knocking head body is arranged in the accommodating cavity and can synchronously rotate along with the shell; the rapper head body is configured to operatively move in the direction of the rotational axis of the housing, and the rapper head body can be connected to or disconnected from the housing during movement of the rapper head body in the direction of the rotational axis of the housing so that the rapper head body can rotate relative to the housing; and

the wire spool comprises a wire spool body; the wire spool body is arranged in the accommodating cavity and can rotate synchronously with the knocking head body; the spool body comprises a wire insertion opening which can be aligned with the wire outlet hole to allow the mowing line to be inserted into the wire insertion opening through the wire outlet hole;

the wire spool further comprises an operating part fixedly connected to the wire spool body, the operating part penetrates out of the shell, and when the operating part is screwed, the wire spool can rotate relative to the shell to wind the grass cutting line on the wire spool body.

In one embodiment, the spool body comprises a spool and a partition edge fixedly connected to the spool, wherein the partition edge extends along the circumferential direction of the spool to form a first winding area and a second winding area on the spool, and the first winding area and the second winding area are located on two opposite sides of the partition edge;

the number of the wire outlet holes is two, and the two wire outlet holes are arranged oppositely; the wire insertion openings are arranged on the partition edge in pairs and comprise at least one pair of wire insertion openings which are suitable for being aligned with the wire outlet holes;

one of the wire plugging openings of each pair of wire plugging openings is communicated with the first winding area, and the other wire plugging opening is communicated with the second winding area.

In one embodiment, the wire insertion opening is used for clamping the tail end of the grass cutting wire and is suitable for pressing the tail end of the grass cutting wire into the wire insertion opening; alternatively, the first and second electrodes may be,

the pair of wire insertion openings are communicated with each other, the communicated paths form a threading channel, and the grass mowing line can be inserted into one of the wire outlet holes, passes through the threading channel and penetrates out of the other wire outlet hole.

In one embodiment, the striking head further comprises a striking cap rotatably connected to the striking head body about the rotational axis of the housing and at least partially penetrating the housing.

In one embodiment, the striking head further comprises a bearing mounted between the striking head body and the striking cap such that the striking cap is rotatable relative to the striking head body.

In one embodiment, the grass mowing head further comprises an elastic piece, and the elastic piece is arranged between the shell and the knocking head body to provide pre-tightening force for enabling the knocking head body to have a movement trend towards the direction of the knocking cap.

In one embodiment, the grass mowing head further comprises a transmission structure arranged between the knocking head body and the shell;

the grass mowing head comprises a grass mowing state and a line releasing state;

when the grass mowing head is in the grass mowing state, the transmission structure can be connected with the knocking head body and the shell, so that the knocking head can synchronously rotate along with the shell;

when the grass mowing head is in the line releasing state, the transmission structure can separate the knocking head body and the shell, so that the knocking head can rotate relative to the shell.

In one embodiment, the transmission structure comprises two sets of transmission parts, each set of transmission part comprises at least two transmission parts, one set of transmission parts is arranged on the knocking head body and is arranged at intervals along the circumferential direction of the knocking head body, and the other set of transmission parts is arranged on the shell and is arranged at intervals along the circumferential direction of the shell;

the two groups of transmission parts can be mutually meshed, so that the knocking head body and the shell can synchronously rotate.

In one embodiment, at least one group of the transmission parts has an inclined surface which is obliquely arranged relative to the rotation axis of the housing, so that screwing the operation part can drive the wire spool body and the knocking head body to rotate relative to the housing towards the direction of the inclined surface.

In one embodiment, the wire spool body is arranged on the knocking head body, the wire spool body is provided with a plurality of first transmission teeth distributed along the circumferential direction of the wire spool body, and the knocking head body is provided with a plurality of second transmission teeth distributed along the circumferential direction of the knocking head body;

the first transmission gear is meshed with the second transmission gear, so that the wire spool body and the knocking head body can synchronously rotate.

In one embodiment, the first transmission tooth and the second transmission tooth each extend in a direction parallel to the rotational axis of the housing, such that the first transmission tooth and the second transmission tooth remain engaged during movement of the rapper head body in the direction of the rotational axis of the housing.

A grass trimmer comprising a grass trimmer head as described in any one of the embodiments above.

Above-mentioned grass cutting head and grass trimmer, when needing the wire winding, grass trimmer's driving piece is out of work (grass cutting head irrotational), will beat the grass line and connect in the wire reel body, then revolve wrong operation portion to it is rotatory to drive the wire reel body and beat the relative casing of first body, and then realizes will beat the grass line and wind on the wire reel body. Because the wire spool body does not move along the rotation axis of the shell, the screwing operation of the handheld operation part is more convenient.

When needs unwrapping wire, the accessible external force is strikeed and is strikeed the cap and make and strike the head body and break away from along the rotation axis direction motion of casing and with the casing, because the wire reel body rotates along with strikeing the head body in step, consequently the wire reel body and strike the head body and wear out the certain angle of casing rotation relatively under the pulling of the line of beating grass of casing for twine in the line of beating grass of wire reel body continue to wear out outside the casing under the effect of centrifugal force, realize the unwrapping wire.

Therefore, in the paying-off process, only the knocking head moves along the rotation axis direction of the shell, and the wire spool can not move along the rotation axis direction of the shell, so that the position of the wire spool relative to the wire outlet hole of the shell is kept unchanged in the rotation axis direction of the shell, the paying-off stability is further improved, and the phenomenon of wire clamping is not easy to occur.

Drawings

FIG. 1 is a cross-sectional view of a grass cutting head in an embodiment of the present invention;

FIG. 2 is an exploded view of the grass-mowing head shown in FIG. 1;

FIG. 3 is a schematic view of the base of the grass-mowing head shown in FIG. 1;

fig. 4 is a schematic structural view of the wire spool of the grass-mowing head shown in fig. 1.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Generally, the winding disc of the grass cutting head is movably arranged in the shell of the grass cutting head along the rotation axis, one end of the knocking head is connected with the winding disc, and the other end of the knocking head penetrates out of the shell to be knocked by external force. When the knocking head is knocked, the winding disc moves along the rotation axis to be disengaged from the shell, so that relative motion is generated between the winding disc and the shell, and paying-off is realized. The inventor of this application discovers that traditional head of beating grass is at the unwrapping wire in-process, and the wire reel need move along the rotation axis to make the wire reel set up the position in the through wires hole of casing relatively and moving in following the rotation axis direction, seriously influence the stability of unwrapping wire, the phenomenon of card line appears easily.

In view of the above problems, it is necessary to provide a grass trimmer head and a grass trimmer with good paying-off stability and less line jamming.

Fig. 1 shows a sectional structure of a grass cutting head in an embodiment of the present invention. Figure 2 shows an exploded view of the grass-mowing head shown in figure 1. For the purpose of illustration, the drawings show only the structures pertinent to the present invention.

As shown in fig. 1 and 2, the grass mowing head according to an embodiment of the present invention includes a housing 10, a knocking head 20 (see fig. 2), and a wire spool 30.

The housing 10 is connectable to an output shaft of a drive member (not shown) of the lawnmower to drive the housing 10 in rotation about its axis of rotation. The housing 10 has a receiving cavity and an outlet hole 146 for the mowing line 100 to pass through the receiving cavity.

The striking head 20 includes a striking head body 21. The knocking head body 21 is disposed in the accommodating cavity of the housing 10 and can rotate synchronously with the housing 10. The tap body 21 is configured to be operatively moved in the rotational axis direction of the housing 10, and during the movement of the tap body 21 in the rotational axis direction of the housing 10, the tap body 21 can be connected to or disconnected from the housing 10 so that the tap body 21 can be rotated relative to the housing 10. So, when the driving piece drive of grass cutter was rotatory at the head of beating grass, usable external force was beaten and is beaten cap 22 for beat the rotation axis direction motion of head body 21 along casing 10, thereby beat head body 21 and be connected or separate with casing 10, because below-mentioned wire reel body 32 with beat head body 21 synchronous revolution (as follows), consequently, twine in wire reel body 32 and wear out the pulling of the line 100 of beating grass outside casing 10 under, wire reel body 32 and beat head body 21 can produce relative rotation relatively casing 10, thereby realize the unwrapping wire.

The spool 30 includes a spool body 32 for winding the mowing line 100, and an operating portion 34 fixedly attached to the spool body 32. The wire spool body 32 is disposed in the accommodating cavity of the housing 10 and can rotate synchronously with the knocking head body 21. The spool body 32 includes a wire insertion opening 3222, and the wire insertion opening 3222 can be aligned with the wire outlet hole 146 to allow the mowing line 100 to be inserted into the wire insertion opening 3222 through the wire outlet hole 146.

The operation portion 34 penetrates the casing 10, and when the operation portion 34 is screwed, the wire spool body 32 and the knocking head body 21 are driven to rotate relative to the casing 10, so that the grass mowing line 100 is wound on the wire spool body 32.

Above-mentioned grass cutting head, when needing the wire winding, the driving piece of machine of beating grass is out of work (grass cutting head irrotational), will beat the grass line and connect in the plug wire opening 3222 of wire reel body 32, then revolve wrong operating portion 34 to it is rotatory to drive wire reel body 32 and beat the relative casing 10 of first body 21, and then realizes twining grass line 100 on wire reel body 32. Since it is the tap body 21 that is movable in the rotational axis direction of the housing 10, but the spool body 32 is not movable in the rotational axis direction of the housing 10, the screwing operation of the hand-held operation portion 34 is more facilitated.

When the line needs to be paid out, the knocking head 20 can be knocked by external force, so that the knocking head body 21 moves along the direction of the rotation axis of the shell 10 to be separated from the shell 10. Because the wire spool body 32 rotates along with knocking the head body 21 synchronously, the wire spool body 32 and the knocking head body 21 rotate for a certain angle relative to the shell 10 under the pulling of the grass mowing line 100 penetrating out of the shell 10, so that the grass mowing line 100 wound on the wire spool body 32 continuously penetrates out of the shell 10 under the action of centrifugal force, and then the paying-off is realized.

In this way, in the wire releasing process, only the tapping head 20 moves along the rotation axis direction of the housing 10, and the wire spool 30 may not move along the rotation axis direction of the housing 10, so that the position of the wire spool 30 relative to the wire outlet hole 146 of the housing 10 in the rotation axis direction of the housing 10 remains unchanged, which is favorable for improving the stability of wire releasing and is not easy to cause wire jamming.

The embodiment of the utility model provides an in, strike head 20 still includes and strikes cap 22, strikes cap 22 around the rotation axis of casing 10 rotationally connect in striking head body 21 to at least part is worn out in casing 10, so that when utilizing external force to strike and strike cap 22, make and strike head body 21 along the rotation axis direction motion of casing 10.

In this manner, because the cap 22 is stationary relative to the sod when in contact therewith, it is avoided that the striking head 20, which rotates with the housing 10, comes into contact with the sod, damaging the sod, wearing the striking head and increasing the load on the drive of the lawnmower. Further, since the striking cap 22 is rotatable with respect to the striking head body 21, it is inconvenient for an operator to wind the mowing line 100 around the spool body 32 by rotating the striking head 20 with his/her hand. In view of this, the operation part 34 penetrating through the housing 10 is disposed on the mowing head, and the wire spool 30 can be rotated by holding the operation part 34 by hand, so that the winding is realized, and the operation of holding by hand of an operator is more convenient.

In some embodiments, the striking head 20 further comprises a bearing 24, the bearing 24 being mounted between the striking head body 21 and the striking cap 22 such that the striking cap 22 is rotatably disposed relative to the striking head body 21. Thus, the bearing 24 is used for realizing the rotatable connection between the knocking cap 22 and the knocking head body 21, and the structure is simple and easy to assemble.

In particular embodiments, the bearing 24 may include an inner race 242 and an outer race 244 that are relatively rotatable. One of the inner ring 242 and the outer ring 244 is fixedly connected to the striking head body 21, and the other is fixedly connected to the striking cap 22. In this manner, by fixedly connecting the striking head body 21 and the striking cap 22 to the inner ring 242 and the outer ring 244 of the bearing 24, respectively, it is achieved that the striking cap 22 is rotatable relative to the striking head body 21. The axis of the bearing 24 is collinear with the axis of the striking head body 21 and the striking cap 22.

In one embodiment, an end of the striking head body 21 facing the striking head body 22 is provided with a mounting groove (not shown) for mounting the bearing 24, and a side of the striking head body 21 facing the striking head body 22 is convexly provided with a convex pillar (not shown) matched with an inner hole of the inner ring 242. In order to achieve a fixed connection of the outer ring 244 of the bearing 24 to the striking head body 21 and a fixed connection of the inner ring 242 of the bearing 24 to the striking cap 22, in the present embodiment, the striking head 20 further includes a first pressing member 25 and a second pressing member 26. One end of the first pressing member 25 is screwed to the tap body 21, and the opposite end abuts against one end of the outer ring 244 away from the tap body 21, so as to press and fix the outer ring 244 to the tap body 21. One end of the second pressing member 26 is screwed to the end of the protruding column, and the other end abuts against one end of the inner ring 242 far away from the knocking cap 22, so as to press and fix the inner ring 242 to the knocking cap 22. Therefore, the inner ring 242 and the outer ring 244 are respectively fixedly installed in a pressing and fixing mode, and the installation and the disassembly are convenient.

It should be noted that the assembly of the bearing 24 is not limited to the way of fixing by pressing, and other ways may be adopted, and is not limited herein. For example, in one embodiment, the outer race 244 of the bearing 24 is an interference fit with the mounting slot and the inner race 242 of the bearing 24 is an interference fit with the post, thereby providing a tight fit of the bearing 24.

It is understood that, in another embodiment, the inner ring 242 of the bearing 24 may be fixedly connected to the striking head body 21, and the outer ring 244 of the bearing 24 may be fixedly connected to the striking cap 22. That is, the mounting groove is opened in the knocking cap 22, and the protruding column is formed in the knocking head body 21. As to how the inner ring 242 and the outer ring 244 are fixedly installed, they are similar to the above embodiments and will not be described herein again.

In the embodiment of the utility model, the grass mowing head further comprises a transmission structure (not shown), and the transmission structure is arranged between the knocking head body 21 and the shell 10. The transmission structure is configured to connect or disconnect the striking head body 21 and the housing 10 during the movement of the striking head 20 in the rotational axis direction of the housing 10, so that the striking head body 21 can be rotated with respect to the housing 10, thereby achieving a striking wire.

In one embodiment, the grass cutting head includes a grass cutting state and a line releasing state. When the grass cutting head is in a grass cutting state, the transmission structure can be connected with the knocking head body 21 and the shell 10, so that the knocking head body 21 can synchronously rotate along with the shell 10. At this moment, the driving part of the grass trimmer drives the shell 10 to rotate, the shell 10 drives the knocking head body 21 to synchronously rotate through the transmission structure, and the knocking head body 21 drives the wire spool body 32 to synchronously rotate, so that the wire spool body 32 synchronously rotates along with the shell 10, and then the grass trimming line 100 which is wound on the wire spool body 32 and penetrates out of the shell 10 through the wire outlet 146 is driven to rotate to trim grass.

When the grass cutting head is in a line releasing state, the transmission structure can separate the beating head body 21 and the shell 10, so that the beating head body 21 can rotate relative to the shell 10, namely, the wire spool body 32 can rotate relative to the shell 10, the grass cutting line 100 wound on the wire spool body 32 is released, and the grass cutting line 100 continuously penetrates out of the shell 10 through the wire outlet hole 146 under the action of centrifugal force, so that line releasing is realized.

Figure 3 shows the structure of the base of the grass-mowing head shown in figure 1.

Referring to fig. 3, in an embodiment, the transmission structure includes two sets of first transmission parts 1220. One set of first transmission parts (not shown) is disposed on the striking head body 21 and arranged at intervals along the circumferential direction of the striking head body 21. The other set of first transmission portions 1220 is disposed on the casing 10 and arranged at intervals along the circumferential direction of the casing 10. The two sets of first transmission portions 1220 are engaged with each other so that the striking head body 21 and the housing 10 can rotate synchronously. Thus, when the grass cutting head is in a grass cutting state, the two groups of first transmission parts 1220 are engaged with each other, so that the knocking head body 1220 and the shell 10 can synchronously rotate. When the grass cutting head is in a line releasing state, the knocking head body 21 moves relative to the shell 10 along the rotation axis direction of the shell 10, so that the two groups of first transmission parts 1220 are separated, the wire spool body 32 and the knocking head body 21 rotate relative to the shell 10 under the pulling of the grass cutting line 100 rotating at a high speed, and the line releasing is realized. Alternatively, the first transmission part 1220 may be a protrusion.

More specifically, at least one set of the first transmission portion 1220 has a slope b disposed obliquely with respect to the rotation axis of the housing 10, so that screwing the operation portion 34 can drive the wire spool body 32 and the striking head body 21 to rotate with respect to the housing 10 toward the slope b. Thus, the winding disc body 32 and the knocking head body 21 are rotated relative to the casing 10 in the direction facing the inclined plane b (i.e. clockwise when viewed from top to bottom in fig. 3) by the screwing operation part 34 under the action of external force, and because the inclined plane b is provided, i.e. the contact surfaces of the two sets of first protrusions 1220 are inclined planes, the winding disc body 32 and the knocking head body 21 can be continuously rotated relative to the casing 10 by continuously screwing the operation part 34 under the action of external force, thereby realizing the winding of the mowing line 100 on the winding disc body 32.

In specific embodiments, the transmission structure further includes a set of second transmission parts 1222, and the set of second transmission parts 1222 includes at least two second transmission parts 1222. The group of second transmission portions 1222 is disposed in the housing 10 and spaced apart from each other in the circumferential direction of the housing 10. Wherein, in the rotation axis direction of the housing 10, the set of second transmission parts 1222 is arranged in a staggered position with the set of first transmission parts 1220 arranged on the housing 10, so that when the knocking cap 22 is knocked, the knocking head body 21 moves along the rotation axis direction of the housing 10, so that the two sets of first transmission parts 1220 are separated until the first transmission parts arranged on the knocking head body 21 are engaged with the second transmission parts 1222. Then, the external force of the knocking disappears, and the knocking head body 21 moves reversely along the rotation axis direction of the housing 10 to be reset, so that the first transmission portion provided to the knocking head body 21 is disengaged from the second transmission portion 1222, and is engaged with the first transmission portion 1220 provided to the housing 10. The second transmission portion 1222 is provided to facilitate control of the length of the line during each tap of the line. Alternatively, the second transmission portion 1222 may be a protrusion.

The embodiment of the utility model provides an in, wire reel body 32 is along circumference along knocking first body 21 synchronous revolution, and can knocking first body 21 relatively along the rotation axis direction of casing 10 and move. So, when the head of beating the grass was in the unwrapping wire state, hit and strike cap 22 and make and strike head body 21 along the rotation axis direction motion of casing 10, transmission structure separation strikes head body 21 and casing 10 for strike head body 21 and rotatory relatively casing 10, the wire reel body 32 is rotatory relatively casing 10 promptly, thereby realizes the unwrapping wire. Because the wire spool body 32 can move relative to the tapping head body 21 along the rotation axis direction of the shell 10, the wire spool body 32 can not move along the rotation axis direction of the shell 10 along with the tapping head body 21 in the wire releasing process.

In some embodiments, the wire spool body 32 is disposed on the striking head body 21. The spool body 32 is provided with a plurality of first transmission teeth (not shown) arranged at intervals in the circumferential direction of the spool body 32. The striking head body 21 is provided with a plurality of second gear teeth 212. The plurality of second gear teeth 212 are arranged at intervals along the circumferential direction of the striking head body 21. The first transmission gear and the second transmission gear 212 are engaged with each other, so that the spool body 32 and the striking head body 21 are synchronously rotated.

In particular, in the embodiment, the first transmission tooth and the second transmission tooth 212 both extend in a direction parallel to the rotation axis of the housing 10, so that during the movement of the striking head body 21 in the rotation axis direction of the housing 10, the engagement of the first transmission tooth and the second transmission tooth 212 does not interfere with the movement of the striking head body 21, and the first transmission tooth and the second transmission tooth are always engaged. That is, during the movement of the striking head body 21 along the rotation axis of the housing 10, the first transmission tooth and the second transmission tooth 212 are always engaged, so that the striking head body 21 and the wire spool body 32 are always synchronously rotatable.

Referring also to fig. 3, in some embodiments, the grass cutting head further comprises a sleeve 122 fixedly disposed within the housing 10, and an axis of the sleeve 122 is collinear with the rotational axis of the housing 10. The knocking head body 21 is disposed on the shaft sleeve 122, and the transmission structure is disposed between the knocking head body 21 and the shaft sleeve 122. In this manner, the connection of the striking head body 21 to the housing 10 is achieved by the bushing 122.

In the embodiment, one of the two sets of first transmission portions 1220 of the transmission structure is disposed on the shaft sleeve 122, and the other set is disposed on the striking head body 21. The second transmission portion 1222 is also disposed at the sleeve 122.

The following describes the working process of the grass cutting head in this embodiment in detail: when the head of beating grass was in the state of beating grass, two sets of first transmission portion 1220 offset (meshing mutually promptly) to beat first body 21 and be connected with casing 10, make and beat first body 21 and rotate along with casing 10 is synchronous, and then drive wire reel body 32 and rotate along with casing 10 is synchronous, beat the first whole synchronous rotation of beating grass promptly, realize beating grass.

When the line needs to be paid out (i.e. the grass cutting head is in a line paying-out state), the knocking cap 22 is knocked, so that the knocking head body 21 moves along the direction of the rotation axis of the housing 10. First, the first transmission portion disposed on the striking head body 21 moves from a position abutting against the first transmission portion 1220 disposed on the shaft sleeve 122 to a position between two adjacent second protrusions 1222 along the rotation axis of the casing 10, and at this time, a rotation speed difference exists between the striking head body 21 and the shaft sleeve 122 (since the driving member always drives the casing 10 to keep rotating, and the wire spool body 32 generates a rotation speed difference with the shaft sleeve 122 under the pulling of the mowing line 100, that is, a rotation speed difference exists between the striking head body 21 and the shaft sleeve 122), so that the first transmission portion disposed on the striking head body 21 abuts against the second transmission portion 1222. When the knocking is completed, the external force acting on the knocking cap 22 disappears, and the knocking head body 21 can be reset under the action of the elastic member 40, so that the first transmission portion arranged on the knocking head body 21 moves along the rotation axis direction of the housing 10 from the position where the first transmission portion 1222 abuts against the second transmission portion 1222, and is arranged between two adjacent first transmission portions 1220 of the shaft sleeve 122, and at this time, a rotation speed difference exists between the knocking head body 21 and the shaft sleeve 122, so that the two sets of first transmission portions abut against each other. Because the first transmission part 1220 and the second transmission part 1222 disposed on the shaft sleeve 122 are arranged in a staggered manner, when the knocking cap 22 is knocked once, the knocking head body 21 rotates by a certain angle (generally, the angle difference between two adjacent first bosses 1220 disposed on the shaft sleeve 122) relative to the shaft sleeve 122 (i.e., the housing 10), thereby realizing the wire releasing.

It should be noted that, in an embodiment, the knocking head body 21 is sleeved outside the shaft sleeve 122, and the transmission structure is disposed between the knocking head body 21 and the shaft sleeve 122. More specifically, two sets of first transmission portions 1220 are respectively disposed on the inner wall of the striking head body 21 and the outer wall of the shaft sleeve 122. The second transmission portion 1222 is disposed on an outer wall of the sleeve 122.

The embodiment of the utility model provides an in, the head of beating grass still includes elastic component 40, and elastic component 40 sets up between casing 10 and the head body 21 of knocking to a pretightning force that the head body 21 of knocking has the motion trend of orientation cap 22 direction is knocked in the provision. Thus, when the external force acting on the knocking cap 22 disappears in the knocking and paying-off process, the knocking head body 21 can return to the position before knocking (i.e. reset) under the elastic force of the elastic piece 40.

In one embodiment, two opposite ends of the elastic element 40 along the rotation axis of the housing 10 respectively abut against the shaft sleeve 122 and the knocking head body 21, so as to provide a pre-tightening force for the knocking head body 21 to have a movement tendency along the rotation axis of the housing 10 towards a direction penetrating through the housing 10. Alternatively, the elastic member 40 may be a spring.

Further, the striking head body 21 is sleeved outside the shaft sleeve 122. The outer side wall of the sleeve 122 is provided with a first annular retainer d (see fig. 1 and 3). The inner side wall of the striking head body 21 is provided with a second annular retainer f (see fig. 1) which can be matched with the first annular retainer d, so that the striking head body 21 is prevented from being separated from the shaft sleeve 122 by the end of the shaft sleeve 122 under the elastic force of the elastic member 40 by the matching of the first annular retainer d and the second annular retainer f. It will be appreciated that a first annular retainer d extends circumferentially about the boss 122 and a second annular retainer f extends circumferentially about the striking head body 21.

Referring to fig. 1, 2 and 3, in an embodiment of the present invention, the housing 10 includes a base 12 and a housing cover 14, and the base 12 and the housing cover 14 are fastened to each other to form the receiving cavity. So, constitute by base 12 and cap 14 with casing 10 design, be convenient for carry out the dismouting to casing 10, be favorable to maintaining, overhauing etc. the head of beating the grass. Specifically, the shaft sleeve 122 is received in the receiving cavity and is fixedly connected to the base 12. An opening 142 through which the knocking cap 22 and the operating portion 34 pass out of the housing 14 opens in the housing cover 14.

Alternatively, the base 12 and the cover 14 may be snap-fit connected. Specifically, in one embodiment, at least two posts 124 are protruded from one side of the base 12 having the shaft sleeve 122, and a slot 144 is formed in the cover 14 corresponding to the posts 124. When the base 12 and the cover 14 are assembled, the posts 124 are aligned with the slots 144 and inserted into the slots 144 to effect the snap-fit of the base 12 to the cover 14. It should be noted that, in another embodiment, the clip 124 can be disposed on the housing cover 14, and the clip groove 144 can be disposed on the base 12. The positions of the locking posts 124 and the locking slots 144 are not limited herein, and the base 12 can be connected to the housing cover 14 in a locking manner.

In the embodiment of the present invention, at least two limiting portions 148 (see fig. 1) are disposed in the casing 10, and the at least two limiting portions 148 are respectively located at two ends of the wire spool body 32 in the rotation axis direction of the casing 10, and contact with the end of the corresponding wire spool body 32 to limit the wire spool body 32 from moving in the rotation axis direction of the casing 10. In the embodiment, the position-limiting portions 148 are respectively disposed on the housing cover 14 and the base 12. The position-limiting portion 148 disposed on the housing cover 14 is used for limiting the movement of the wire spool body 32 along the rotation axis of the housing 10 toward the opening 142, and the position-limiting portion 148 disposed on the base 12 is used for limiting the movement of the wire spool body 32 along the rotation axis of the housing 10 away from the opening 142. In the cross-sectional structure of the grass-mowing head shown in fig. 1, only the stopper 148 provided on the cover 14 is shown.

It should be noted that the limiting portion 148 is not essential, and the opposite ends of the wire spool body 32 in the rotation axis direction of the housing 10 may be respectively in contact with the base 12 and the housing cover 14 to limit the movement of the wire spool body 32 in the rotation axis direction of the housing 10.

Fig. 4 shows the structure of the wire spool of the grass-mowing head shown in fig. 1.

Referring to fig. 4, in an embodiment of the present invention, the spool body 32 includes a spool (not shown) and a separation edge 322 fixedly connected to the spool. The partition 322 extends circumferentially of the bobbin to form a first winding area 324 and a second winding area 326 on opposite sides of the partition 322 on the bobbin.

The number of the wire outlet holes 146 is two, and the two wire outlet holes 146 are arranged oppositely. The wire insertion openings 3222 are arranged in pairs on the flange 322 and include at least one pair of wire insertion openings 3222 adapted to be aligned with the wire outlet aperture 146. One of the wire insertion openings 3222 of each pair of wire insertion openings 3222 is communicated with the first winding area 324, and the other wire insertion opening 3222 is communicated with the second winding area 326.

Thus, one end of the mowing line 100, which penetrates out of the line plugging opening 3222 communicated with the first winding area 324, is wound around the first winding area 324 and penetrates out of the housing 10 through the corresponding line outlet hole 146. One end of the mowing line 100, which penetrates out of the line plugging opening 3222 communicated with the second winding area 326, is wound around the second winding area 326 and penetrates out of the shell 10 through the other line outlet hole 146.

It should be noted that the two outlet holes are arranged oppositely, and not only completely opposite, but also a certain error range exists.

In one embodiment, the cord insertion opening is adapted to grip the end of a grass cord and to urge the end of the grass cord within the cord insertion opening 3222. Thus, two grass cutting lines 100 need to be provided, wherein one end of one grass cutting line 100 is inserted into and tightly pressed in the wire inserting opening 3222 communicated with the first winding area 324 and wound around the first winding area 324, and the other end of the grass cutting line 100 penetrates out of the housing 10 through the corresponding wire outlet hole 146; one end of the other mowing line 100 is inserted into and pressed tightly against the line inserting opening 3222 communicated with the second winding area 326 and wound around the second winding area 326, and the other end of the other mowing line penetrates out of the shell 10 through the corresponding line outlet hole 146.

In another embodiment, a pair of insertion openings 3222 are in communication with one another, with the communication path forming a threading channel. The cord 100 can be inserted through one of the exit holes 146, through the threading channel, and out through the other exit hole 146. Thus, since the pair of wire insertion openings 3222 are communicated with each other through the threading channel, only one grass mowing line 100 is needed, and when the grass mowing line 100 is installed, one end of the grass mowing line 100 can be inserted into one threading hole 146 of the housing 10 and the corresponding wire insertion opening 3222 can be inserted into the threading channel. And then out through another thread insertion opening 3222 and out of the housing 10 through another thread insertion hole 146. Then, the operating portion 34 is manually rotated to rotate the spool body 32 relative to the housing 10 about the rotation axis, so as to wind the two ends of the grass mowing cord 100 around the first winding area 324 and the second winding area 326, respectively. Thus, the line can be installed without disassembling the shell 10 of the grass cutting head, which is beneficial to simplifying the operation of the grass cutting machine and improving the use convenience. It should be noted that the threading wire extends through the bend to pass around the central hole (not shown) of the spool for fitting the striking head body 21.

It can be understood that the relative arrangement of the two outlet holes for grass cutting means that: the two outlet holes 146 are arranged approximately symmetrically with respect to the rotation axis of the housing 10 (i.e. the axis of the shaft sleeve 122), so that the grass-mowing head is uniformly stressed during rotation and has good rotation stability.

Specifically, in the embodiment, the bobbin is a cylindrical structure with openings at two ends, and is sleeved on the outer side of the knocking head body 21.

In one embodiment, the spool body 32 further includes two flanges 328 fixedly connected to opposite ends of the spool, and the flanges 328 extend in the circumferential direction of the spool to prevent the mowing line 100 wound around the first winding region 324 and the second winding region 326 from being separated from the opposite ends of the spool. It will be appreciated that the spacer 322 is located between the two flanges 328.

Based on the grass mowing head, the utility model discloses still provide a grass mowing machine, this grass mowing machine includes the grass mowing head in as above arbitrary embodiment.

In particular embodiments, the lawnmower further comprises a drive member, the output shaft of which is fitted within the sleeve 122 to drive the housing 10 in rotation. The output shaft of the driving member is assembled with the shaft sleeve 122 in various ways, such as bolt connection, interference fit, and key connection, as long as the rotation of the drivable housing 10 can be achieved, which is not limited herein. Alternatively, the drive member may be a motor.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. Grass cutting head, its characterized in that includes:

the shell is provided with an accommodating cavity and a wire outlet hole for the grass mowing line to pass through from the accommodating cavity;

2. The grass mowing head according to claim 1, wherein the spool body comprises a spool and a partition edge fixedly connected to the spool, the partition edge extending in the circumferential direction of the spool to form a first winding area and a second winding area on the spool on opposite sides of the partition edge;

3. The grass-mowing head according to claim 2, wherein the cord-inserting opening is used for clamping the tail end of the grass-mowing cord and is adapted to press the tail end of the grass-mowing cord into the cord-inserting opening; alternatively, the first and second electrodes may be,

4. The grass-mowing head according to claim 1, wherein the striking head further comprises a striking cap rotatably connected to the striking head body about a rotational axis of the housing and at least partially penetrating the housing.

5. The grass-mowing head according to claim 4, wherein the striking head further comprises a bearing mounted between the striking head body and the striking cap so that the striking cap is rotatable relative to the striking head body.

6. The grass-mowing head according to claim 4, further comprising an elastic member disposed between the housing and the knocking head body to provide a pre-tightening force for the knocking head body to have a tendency to move toward the direction of the knocking cap.

7. The grass-mowing head according to claim 1, further comprising a transmission structure disposed between the striking head body and the housing;

8. The grass mowing head according to claim 1, wherein the wire spool body is connected to the striking head body, the wire spool body is provided with a plurality of first transmission teeth arranged along the circumferential direction of the wire spool body, and the striking head body is provided with a plurality of second transmission teeth arranged along the circumferential direction of the striking head body;

9. The grass-mowing head according to claim 8, wherein the first transmission tooth and the second transmission tooth each extend in a direction parallel to the rotational axis of the housing, so that the first transmission tooth and the second transmission tooth are kept engaged during the movement of the striking head body in the direction of the rotational axis of the housing.

10. Grass trimmer characterized in that it comprises a grass trimmer head as claimed in any one of claims 1 to 9.