CN112352531B

CN112352531B - Grass trimmer and production process thereof

Info

Publication number: CN112352531B
Application number: CN202011125388.XA
Authority: CN
Inventors: 李晓中; 杨栩迪; 陈由飞; 俞黎明
Original assignee: CIXI CITY BEST POWER TOOLS CO LTD
Current assignee: CIXI CITY BEST POWER TOOLS CO LTD
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-12-21
Anticipated expiration: 2040-10-20
Also published as: CN112352531A

Abstract

The application relates to a grass trimmer and production technology thereof, including handle components, the aircraft nose that is used for mowing and the coupling assembling who is used for connecting handle components and aircraft nose, coupling assembling includes the connecting rod of being connected with handle components, the locating lever of being connected with the aircraft nose and sets up the setting element between connecting rod and locating lever, the confession has all been seted up to the both sides lateral wall of connecting rod the locking recess that the setting element slided and was placed, the joint recess that corresponds with the locking recess is seted up to the both sides of locating lever, the setting element slide install in the joint recess, the setting element embedding in the locking recess. This application has made things convenient for the effect that the machine of beating grass switched between two kinds of modes of beating grass.

Description

Grass trimmer and production process thereof

Technical Field

The application relates to the technical field of grass trimmers, in particular to a grass trimmer and a production process thereof.

Background

The present lawnmower is a handheld implement for cutting weeds in lawns, gardens, pastures, and the like.

An authorized bulletin number CN106993429B discloses a grass trimmer, comprising: the grass cutting head is used for driving the grass cutting head to rotate so as to cut vegetation; the operating device is used for being operated by a user to control the grass trimmer; the grass cutting head comprises a spool and a head shell, wherein the spool is used for winding a grass cutting rope, and the head shell is used for accommodating the spool and is provided with a threading hole for the grass cutting rope to pass through; the drive arrangement includes a motor, and the lawnmower has an automatic winding mode in which the motor drives at least one of the spool and the head housing to rotate the spool and the head housing relative to each other to automatically wind the cord onto the spool.

However, in the actual using process of the grass trimmer, when the grass trimmer needs to be trimmed, the grass trimmer head needs to be manually rotated to enable the trimming plane of the grass trimmer head to be flush with the vertical plane, so that the grass trimmer is complicated to use.

SUMMERY OF THE UTILITY MODEL

In order to facilitate the grass trimmer to switch between two grass trimming modes, the application provides the grass trimmer.

The technical scheme provided by the application is as follows:

the utility model provides a grass mower, includes handle components, is used for the aircraft nose of beating grass and is used for the coupling assembling of connecting handle components and aircraft nose, coupling assembling includes the connecting rod of being connected with handle components, the locating lever of being connected with the aircraft nose and sets up the setting element between connecting rod and locating lever, the confession has all been seted up to the both sides lateral wall of connecting rod the locking recess that the setting element slided and places, the joint recess that corresponds with the locking recess is seted up to the both sides of locating lever, the setting element slide install in the joint recess, the setting element embedding in the locking recess.

By adopting the technical scheme, in the using process, when the grass trimmer is normally used, the bottom surface of the machine head is parallel to the ground, so that grass can be cut on the ground, and when the grass trimmer needs trimming, the grass trimmer is rotated, so that the structure of the grass trimmer is parallel to the vertical surface, so that trimming on the vertical surface is realized, and the application range of the grass trimmer is expanded to a certain extent; when the position of the machine head of the grass trimmer needs to be adjusted, the positioning piece only needs to be moved backwards, and the machine head of the grass trimmer can move from a state of grass trimming to the ground to a position required by trimming under the action of the gravity of the machine head, so that the two grass trimming modes of the grass trimmer are convenient to switch.

Optionally, the lateral wall of setting element is provided with and makes the setting element have the locking piece that resets towards locking recess motion trend all the time, the one end and the setting element butt of locking piece that resets, the other end and the locking piece butt that resets.

Through adopting above-mentioned technical scheme, reset the piece through setting up locking, when rotating connecting rod and locating lever, after rotatory to required position, the setting element resets automatically under the piece effect in locking, has made things convenient for the conversion to two kinds of mode of grass cutter.

Optionally, the aircraft nose includes the installing support, set up in the driving motor at installing support top, with the subassembly of beating grass of driving motor output shaft and set up in the gyro wheel of installing support lateral wall, the gyro wheel rotatory install in the lateral wall of installing support, the top of installing support is provided with a mount pad, install a hydraulic shock absorber in the mount pad, the gyro wheel rotatory install in the tip of hydraulic shock absorber.

By adopting the technical scheme, the roller and the hydraulic shock absorber are arranged, so that the shock generated by the roller in the movement process can be reduced through the hydraulic shock absorber in the use process of the grass trimmer, the movement of the grass trimmer is more stable in the use process, and the use of the grass trimmer is more stable; when the grass trimmer is used for trimming grass at corners, the guide can be carried out through the rollers, so that the probability of collision between the machine head of the grass trimmer and the wall surface is reduced, and the grass trimming process of the grass trimmer is more labor-saving; the position of gyro wheel for the mount pad can be adjusted according to the demand of difference to the application scope of machine of beating grass has further been promoted.

Optionally, the grass cutting assembly comprises an installation sleeve, a buffer sleeve arranged on the outer side of the installation sleeve, an adjusting sleeve arranged on the outer side of the buffer sleeve, a protection sleeve arranged on the outer side of the adjusting sleeve and a grass cutting rope arranged on the outer side of the adjusting sleeve, wherein the bottom of the protection sleeve is provided with a groove for accommodating the installation sleeve, the buffer sleeve and the adjusting sleeve, the bottom of the protection sleeve is provided with a cover plate for accommodating the groove, rope outlet grooves for allowing the grass cutting rope to pass are formed in the two sides of the protection sleeve, the installation sleeve is connected with the output shaft of the driving motor, a coil spring is arranged on the outer side of the buffer sleeve, the outer portion of the coil spring is fixed to the inner wall of the installation sleeve, and the grass cutting rope is wound on the outer side of the adjusting sleeve.

Through adopting above-mentioned technical scheme, when driving motor during operation, driving motor turns to the shrink opposite direction with the coil spring, under the instantaneous acceleration that driving motor opened, the coil spring is opened until the outside butt with the lag, drive the cushion collar and rotate under driving motor's effect afterwards, thereby it rotates to drive the adjusting collar that is located the cushion collar outside, thereby make the adjusting collar have higher rotational speed when rotating, thereby reduced the invalid wearing and tearing that the grass cutting rope produced when low rotational speed, the life who has promoted the grass cutting rope to a certain extent.

Optionally, a damping member is arranged between the adjusting sleeve and the buffer sleeve, one side of the damping member is abutted against the side wall of the adjusting sleeve, and the other side of the damping member is abutted against the side wall of the buffer sleeve.

Through adopting above-mentioned technical scheme, set up damping piece between adjusting collar and cushion collar, thereby promoted the frictional force between adjusting collar and the cushion collar, make the cushion collar at the pivoted in-process, under the effect of instantaneous acceleration, make the cushion collar can carry out the relative rotation of certain angle for the adjusting collar, thereby make the grass cutting rope that is located on the adjusting collar can carry out the extension of certain length, thereby make the grass cutting rope can unreel automatically, made things convenient for the use of grass cutter.

Optionally, a damping adjusting part is installed on the side wall of the adjusting sleeve, and the damping adjusting part is installed on the side wall of the adjusting sleeve in a threaded manner and is mutually abutted and pressed against the damping part.

Through adopting above-mentioned technical scheme, through setting up the damping regulating part, can adjust the damping between cushion collar and the adjusting collar to adjust the relative angle of rotation between cushion collar and the adjusting collar, thereby adjust the length of rope extension of mowing.

Optionally, a plurality of first locking grooves are circumferentially arranged on the inner wall of the protecting sleeve at intervals, a plurality of limiting grooves corresponding to the first locking grooves one to one are formed in the outer side wall of the adjusting sleeve, a limiting block is arranged in each limiting groove, and a first reset spring connected with the limiting grooves is arranged on the side wall of each limiting block.

Through adopting above-mentioned technical scheme, during the use, after the rotational speed reaches the certain degree, under the centrifugal force effect, in the stopper embedding first locking recess, realize the location between lag and adjusting collar, thereby make the lag follow adjusting collar simultaneous movement, thereby make the locking rope can place in the adjusting collar outside, after driving motor stall, lag and adjusting collar separation, thereby make the adjusting collar shrink under the effect of wind spring, make the rope of mowing move to the lag outside, the rope of mowing exposes the probability that takes place the damage in the outside.

Optionally, a plurality of positioning grooves are formed in the side wall of the adjusting sleeve at intervals in the circumferential direction, positioning through holes communicated with the positioning grooves are formed in the side wall of the buffer sleeve, a locking block is slidably mounted in the positioning through holes, and a second reset spring is arranged between the side wall of the locking block and the side wall of the positioning groove facing the output shaft of the driving motor.

Through adopting above-mentioned technical scheme, after driving motor stall, because reverse rotation under the effect of spring coil between adjusting sleeve and the cushion collar, make the latch segment between adjusting sleeve and the cushion collar lock adjusting sleeve and cushion collar at will, realize the rolling to the grass cutting rope that stretches out the protection casing outside, after the spring coil resets completely, the latch segment resets completely under the effect of second reset spring, can realize the relative rotation between adjusting sleeve and the cushion collar this moment, with the realization to the regulation of grass cutting rope length, thereby make the length adjustment of grass cutting rope more convenient.

Optionally, a trimming blade for trimming the mowing rope is arranged at the bottom of the mounting bracket, the trimming blade is fixedly mounted at the bottom of the mounting bracket, and the trimming blade trims the mowing rope.

Through adopting above-mentioned technical scheme, through setting up the trimming blade, reduced because take place to interfere between the length overlength of cutting the grass rope and the installing support, lead to the probability that the rotation rate of cutting the grass rope descends to guaranteed that the whole grass trimmer has higher efficiency of beating grass.

A production process of a grass trimmer comprises the following preparation steps: performing injection molding on all parts made of plastic materials; s1: inserting a trimming blade into the side wall of the mounting bracket which is just formed, so that the trimming blade is fixed with the mounting bracket; s2: assembling the whole machine head; s3: assembling the handle integrally; s4: assembling the connecting component between the handle and the machine head; and S5, debugging the whole grass trimmer.

By adopting the technical scheme, the method has the advantages that,

in summary, the present application includes at least one of the following beneficial technical effects:

by arranging the connecting assembly, the grass trimmer can be conveniently switched between two grass mowing modes;

by arranging the grass cutting assembly, the abrasion and the aging of the grass cutting rope in the use process are reduced, and the service life of the grass cutting rope is prolonged;

through setting up the trimming blade, reduced the rope of mowing because length overlength leads to taking place to interfere between grass cutting rope and the installing support to ensured that the rope of mowing has comparatively stable rotational speed, thereby promoted the efficiency of mowing of the machine of mowing at a certain extent.

Drawings

Fig. 1 is a schematic view of the overall structure of the present application.

Fig. 2 is a schematic illustration of the explosive structure of the handpiece in the present application.

Fig. 3 is a schematic view of the general structure of the head part of the present application.

Fig. 4 is a schematic view of an exploded structure of the grass cutting assembly of the present application.

Fig. 5 is a schematic view of the overall structure of the adjusting sleeve in the present application.

Fig. 6 is an exploded view of the rotary adjustment assembly of the present application.

Fig. 7 is a schematic exploded view of the connection assembly of the present application.

Fig. 8 is a schematic view of another exploded structure of the connection assembly of the present application.

Reference number specification, 1, handle assembly; 2. a machine head; 21. mounting a bracket; 211. protecting and flanging; 212. a mounting seat; 213. a hydraulic shock absorber; 214. positioning a nut; 215. trimming the blade; 22. a drive motor; 221. a left shield; 222. a right shield; 23. a grass cutting assembly; 231. installing a sleeve; 232. a buffer sleeve; 2321. a coil spring; 2322. positioning the through hole; 2323. a locking block; 2324. a second return spring; 233. an adjusting sleeve; 2331. a damping member; 2332. a damping adjustment member; 2333. a limiting groove; 2334. a locking buckle; 234. a protective sleeve; 2341. placing a groove; 2342. covering the plywood; 2343. a rope outlet groove; 2344. a first locking groove; 2345. a limiting block; 2346. a first return spring; 2337. a positioning groove; 235. cutting the grass rope; 24. a roller; 3. a connecting assembly; 31. a connecting rod; 311. a third locking groove; 312. an axial positioning groove; 32. positioning a rod; 321. a positioning part; 322. clamping the groove; 323. a clamping part; 324. a limiting plate; 325. a guide slope; 33. a positioning member; 331. locking a reset piece; 34. a clamping piece; 341. a positioning ring; 342. positioning the elastic sheet; 4. a rotation adjustment assembly; 41. a left mounting base; 411. pressing the groove; 42. a right mounting base; 43. a limiting disc; 431. installing a groove; 432. locking the flanging; 433. a second locking groove; 44. a locking member; 441. positioning the flanging; 442. and positioning the convex teeth.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

In the case of the example 1, the following examples are given,

the embodiment of the application discloses machine of beating grass, refers to figure 1, including handle components 1, the aircraft nose 2 that is used for beating the grass and be used for connecting handle components 1 and aircraft nose 2's coupling assembling 3 and set up the rotation regulation subassembly 4 between coupling assembling 3 and aircraft nose 2.

Referring to fig. 2, the head 2 includes a mounting bracket 21, a driving motor 22 disposed at the top of the mounting bracket 21, a grass cutting assembly 23 connected to an output shaft of the driving motor 22, and rollers 24 disposed on the side walls of the mounting bracket 21.

Referring to fig. 2 and 3, the mounting bracket 21 is provided in a fan shape, and a protection flange 211 is provided at the bottom of the mounting bracket 21. The top of the mounting bracket 212 is provided with a mounting base 212, a hydraulic damper 213 is installed in the mounting base 212 through threads, and positioning nuts 214 are installed on two sides of the hydraulic damper 213, which are located on the mounting base 212, through threads. The roller 24 is rotatably mounted to an end of the hydraulic damper 213.

The driving motor 22 is installed on the top of the mounting bracket 21, a left protective cover 221 and a right protective cover 222 are respectively arranged on two sides of the driving motor 22, the driving motor 22 is covered by the left protective cover 221 and the right protective cover 222, and the bottoms of the left protective cover 221 and the right protective cover 222 are connected with the mounting bracket 21 through bolts.

Referring to fig. 3 and 4, the grass cutting assembly 23 includes a mounting sleeve 231, a buffer sleeve 232 disposed outside the mounting sleeve 231, an adjusting sleeve 233 disposed outside the buffer sleeve 232, a protecting sleeve 234 disposed outside the adjusting sleeve 233, and a grass cutting rope 235 disposed outside the adjusting sleeve 233. The bottom of the mounting bracket 21 is provided with a trimming blade 215 for trimming the mowing cord, the trimming blade 215 is fixedly mounted at the bottom of the mounting bracket 21, and the trimming blade 215 trims the mowing cord 235.

The bottom of lag 234 is seted up and is supplied the installation cover 231, buffer sleeve 232 and adjust the recess 2341 of placing of cover 233 installation, and the bottom of lag 234 is provided with the lid and closes lid 2342 of placing recess 2341. Rope outlet grooves 2343 for the mowing rope 235 to penetrate out are formed in the two sides of the protecting sleeve 234.

The mounting sleeve 231 is connected with an output shaft of the driving motor 22, a coil spring 2321 is arranged on the outer side of the buffer sleeve 232, and the outer part of the coil spring 2321 is fixed with the inner wall of the mounting sleeve 231.

A damper 2331 is provided between the adjustment sleeve 233 and the cushion sleeve 232, one side of the damper 2331 abuts against the side wall of the adjustment sleeve 233, and the other side of the damper 2331 abuts against the side wall of the cushion sleeve 232. A damping adjuster 2332 is installed on the side wall of adjusting sleeve 233, and damping adjuster 2332 is screwed on the side wall of adjusting sleeve 233 and is pressed against damping member 2331. In this embodiment, the damping adjuster 2332 is an adjusting bolt, the side wall of which abuts the damping adjuster 2331.

The inner wall of lag 234 is equipped with a plurality of first locking recess 2344 of interval in circumferential direction, and the lateral wall of adjusting sleeve 233 is seted up a plurality of spacing recesses 2333 with first locking recess 2344 one-to-one, is provided with a stopper 2345 in the spacing recess 2333, and the lateral wall of stopper 2345 is provided with and is connected first reset spring 2346 between spacing recess 2333.

The side wall of the adjusting sleeve 233 is circumferentially provided with a plurality of positioning grooves 2337 at intervals, the side wall of the cushion sleeve 232 is provided with a positioning through hole 2322 communicated with the positioning grooves 2337, a locking block 2323 is slidably mounted in the positioning through hole 2322, and a second return spring 2324 is arranged between the side wall of the locking block 2323 and the side wall of the positioning groove 2337 facing the output shaft of the driving motor 22.

Referring to fig. 4 and 5, the grass cutting rope 235 is wound around the outer side of the adjusting sleeve 233, a locking buckle 2334 is arranged on the side wall of the adjusting sleeve 233, the middle of the grass cutting rope 235 is fixed on the adjusting sleeve 233 by the locking buckle 2334, then the adjusting sleeve 233 is rotated, the grass cutting rope 235 is wound on the adjusting sleeve 233, two locking buckles 2334 are arranged at intervals along the height direction of the adjusting sleeve 233, and the two locking buckles 2334 are respectively located on two sides of the limiting block 2345. The interference between the mowing rope 235 and the locking block 2323 and the limiting block 2345 in the telescopic process is avoided.

When the buffer sleeve 232 rotates under the action of the driving motor 22, the locking block 2323 moves towards the positioning groove 2337 on the side wall of the adjusting sleeve 233 under the action of centrifugal force and is embedded into the positioning groove 2337 to realize locking between the adjusting sleeve 233 and the buffer sleeve 232, so that the adjusting sleeve 233 and the buffer sleeve 232 rotate synchronously, in the process, the mowing rope 235 gradually rotates towards one side far away from the adjusting sleeve 233 under the action of centrifugal force, and unwinding of the mowing rope 235 is realized. After the driving motor 22 stops working, the limiting block 2345 is separated from the protective cover under the action of the first return spring 2346, meanwhile, the adjusting sleeve 233 and the buffering sleeve 232 rotate reversely under the action of the coil spring 2321, so that the locking block 2323 between the adjusting sleeve 233 and the buffering sleeve 232 locks the adjusting sleeve 233 and the buffering sleeve 232 at any time, the mowing rope 235 extending out of the protective cover is wound, after the coil spring 2321 completely resets, the locking block 2323 completely resets under the action of the second return spring 2324, at this time, the relative rotation between the adjusting sleeve 233 and the buffering sleeve 232 can be achieved, and the length of the mowing rope 235 can be adjusted.

Referring to fig. 6 and 7, the rotation adjusting assembly 4 is installed at one side of the head 2 facing the connecting assembly 3, and the rotation adjusting assembly 4 includes a left mounting seat 41 disposed on a side wall of the left protection cover 221, a right mounting seat 42 disposed on a side wall of the right protection cover 222 and corresponding to the left mounting seat 41, a limiting plate 43 disposed on a side wall of the left mounting seat 41, and a locking member 44 for locking the limiting plate 43 with the left mounting seat 41 and the right mounting seat 42. In this embodiment, the left mounting base 41 and the left shield 221 are integrally formed, and the right mounting base 42 and the right shield 222 are integrally formed.

Mounting groove 431 has been seted up to the lateral wall of spacing dish 43, mounting groove 431's lateral wall border department is formed with locking turn-ups 432, locking turn-ups 432 and right mount pad 42's lateral wall circumference interval is equipped with second locking recess 433, the lateral wall border department of retaining member 44 is formed with the location turn-ups 441 that corresponds with locking turn-ups 432, the lateral wall of location turn-ups 441 is provided with the location dogtooth 442 of embedding in second locking recess 433, the lateral wall of retaining member 44 is provided with the third elasticity piece that resets (not shown in the figure) that butts with spacing dish 43, left side mount pad 41 and right mount pad 42 lid close the back shroud and are located the spacing dish 43 and the retaining member 44 outside, the pressing recess 411 that supplies retaining member 44 part to pass is seted up to the lateral wall of left side mount pad 41.

Referring to fig. 6 and 7 of the drawings, the connecting assembly 3 is mounted on a side wall of the limiting plate 43, and the connecting assembly 3 includes a connecting rod 31 connected to the handle assembly 1, a positioning rod 32 connected to the handpiece 2, a positioning member 33 disposed between the connecting rod 31 and the positioning rod 32, and a clamping member 34 for clamping the connecting rod 31 and the positioning rod 32.

The positioning rod 32 has a positioning portion 321 provided at the bottom thereof and integrally provided with the stopper plate 43. The third locking recess 311 that supplies setting element 33 to slide and place is all seted up to the both sides lateral wall of connecting rod 31, and the joint recess 322 that corresponds with third locking recess 311 is seted up to the both sides of locating lever 32, and setting element 33 slides and installs in joint recess 322, and setting element 33 imbeds in the third locking recess 311. The side wall of the positioning member 33 is provided with a locking reset member (not shown in the figure) which makes the positioning member 33 always have a tendency to move towards the third locking recess 311, one end of the locking reset member abuts against the positioning member 33, and the other end abuts against the connecting rod 31.

Referring to fig. 7 and 8, the clip 34 is mounted on the connecting rod 31, the connecting rod 31 is provided with an axial positioning slot 312 for axially positioning and clipping the clip 34, the clip 34 has a positioning ring 341 located at the bottom and a positioning elastic sheet 342 disposed at the top of the positioning ring 341, the positioning elastic sheet 342 is circumferentially and uniformly spaced along the edge of the positioning ring 341 by at least four, the positioning rod 32 has a clipping portion 323 facing one side of the clip 34 and a limiting plate 324 disposed at the clipping portion 323 facing one side of the clip 34, a guiding inclined plane 325 disposed in an annular shape is disposed between the clipping portion 323 and the limiting plate 324, the inclination angle of the guiding inclined plane 325 is equal to the inclination angle of the positioning elastic sheet 342, and the side wall of the positioning elastic sheet 342 is attached to the side wall of the guiding inclined plane 325.

In the in-process of transportation, connecting rod 31 and locating lever 32 can separately pack, thereby the packing size has been reduced, during the installation, peg graft connecting rod 31 on locating lever 32, limiting plate 324 moves towards one side that is close to joint piece 34 this moment, limiting plate 324 extrudes location shell fragment 342, when limiting plate 324 moves to location shell fragment 342 one side completely, paste after the shrink of location shell fragment 342 and lean on direction inclined plane 325, and the top and the limiting plate 324 butt of location shell fragment 342, the realization is to being connected between connecting rod 31 and the locating lever 32.

In the case of the example 2, the following examples are given,

a production process of a grass trimmer comprises the following preparation steps: all plastic parts in example 1 were injection molded; s1: inserting a trimming blade 215 into a sidewall of the mounting bracket 21 which is just formed, so that the trimming blade 215 is fixed to the mounting bracket 21; s2: assembling the whole machine head 2; s3: assembling the handle integrally; s4: assembling the connecting component 3 between the handle and the machine head 2; and S5, debugging the whole grass trimmer.

The implementation principle of the grass trimmer of the embodiment is as follows: in the using process, when the grass trimmer is normally used, the bottom surface of the machine head is parallel to the ground, so that grass can be cut on the ground, when the grass trimmer needs trimming, the grass trimmer is rotated, so that the structure of the grass trimmer is parallel to the vertical surface, the trimming on the vertical surface is realized, and the application range of the grass trimmer is expanded to a certain extent; when the position of the machine head of the grass trimmer needs to be adjusted, the positioning piece only needs to be moved backwards, and the machine head of the grass trimmer can move from a state of grass trimming to the ground to a position required by trimming under the action of the gravity of the machine head, so that the two grass trimming modes of the grass trimmer are convenient to switch.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A grass trimmer, comprising a handle assembly (1) and a head (2) for trimming grass, characterized in that: the handle assembly is characterized by further comprising a connecting assembly (3) used for connecting the handle assembly (1) and the machine head (2), wherein the connecting assembly (3) comprises a connecting rod (31) connected with the handle assembly (1), a positioning rod (32) connected with the machine head (2) and a positioning piece (33) arranged between the connecting rod (31) and the positioning rod (32), third locking grooves (311) for sliding placement of the positioning piece (33) are formed in side walls of two sides of the connecting rod (31), clamping grooves (322) corresponding to the third locking grooves (311) are formed in two sides of the positioning rod (32), the positioning piece (33) is slidably mounted in the clamping grooves (322), and the positioning piece (33) is embedded into the third locking grooves (311); the handpiece (2) comprises a mounting bracket (21), a driving motor (22) arranged at the top of the mounting bracket (21), a grass mowing assembly (23) connected with an output shaft of the driving motor (22) and a roller (24) arranged on the side wall of the mounting bracket (21), wherein the roller (24) is rotatably arranged on the side wall of the mounting bracket (21), the top of the mounting bracket (212) is provided with a mounting seat (212), a hydraulic shock absorber (213) is arranged in the mounting seat (212), and the roller (24) is rotatably arranged at the end part of the hydraulic shock absorber (213); the grass mowing assembly (23) comprises an installation sleeve (231), a buffer sleeve (232) arranged on the outer side of the installation sleeve (231), an adjusting sleeve (233) arranged on the outer side of the buffer sleeve (232), a protection sleeve (234) arranged on the outer side of the adjusting sleeve (233) and a grass cutting rope (235) arranged on the outer side of the adjusting sleeve (233), wherein a placing groove (2341) for installing the installation sleeve (231), the buffer sleeve (232) and the adjusting sleeve (233) is formed in the bottom of the protection sleeve (234), a covering plate (2342) covering the placing groove (2341) is arranged at the bottom of the protection sleeve (234), rope outlet grooves (2343) for the grass cutting rope (235) to penetrate through are formed in the two sides of the protection sleeve (234), the installation sleeve (231) is connected with an output shaft of the driving motor (22), a coil spring (2321) is arranged on the outer side of the buffer sleeve (232), and the outer portion of the coil spring (2321) is fixed with the inner wall of the installation sleeve (231), the grass cutting rope (235) is wound on the outer side of the adjusting sleeve (233); the inner wall of the protection sleeve (234) is circumferentially provided with a plurality of first locking grooves (2344) at intervals, the outer side wall of the adjusting sleeve (233) is provided with a plurality of limiting grooves (2333) corresponding to the first locking grooves (2344) in a one-to-one mode, a limiting block (2345) is arranged in each limiting groove (2333), and the side wall of each limiting block (2345) is provided with a first return spring (2346) connected with the limiting grooves (2333).

2. A lawnmower according to claim 1, wherein: the lateral wall of setting element (33) is provided with and makes setting element (33) have the locking piece (331) that resets towards locking recess motion trend all the time, the one end and the setting element (33) butt of locking piece (331) that resets, the other end and the butt of locking piece (331) that resets.

3. A lawnmower according to claim 1, wherein: a damping piece (2331) is arranged between the adjusting sleeve (233) and the buffering sleeve (232), one side of the damping piece (2331) is abutted against the side wall of the adjusting sleeve (233), and the other side of the damping piece (2331) is abutted against the side wall of the buffering sleeve (232).

4. A lawnmower according to claim 3, wherein: a damping adjusting piece (2332) is installed on the side wall of the adjusting sleeve (233), and the damping adjusting piece (2332) is installed on the side wall of the adjusting sleeve (233) in a threaded mode and is mutually abutted and pressed with the damping piece (2331).

5. A lawnmower according to claim 1, wherein: the side wall of the adjusting sleeve (233) is circumferentially provided with a plurality of positioning grooves (2337) at intervals, the side wall of the buffer sleeve (232) is provided with positioning through holes (2322) communicated with the positioning grooves (2337), a locking block (2323) is installed in the positioning through holes (2322) in a sliding mode, and a second return spring (2324) is arranged between the side wall of the locking block (2323) and the side wall of the positioning groove (2337) facing the output shaft of the driving motor (22).

6. A lawnmower according to claim 1, wherein: the trimming blade (215) for trimming the grass cutting rope (235) is arranged at the bottom of the mounting support (21), the trimming blade (215) is fixedly mounted at the bottom of the mounting support (21), and the trimming blade (215) trims the grass cutting rope (235).

7. A process for the production of a lawnmower according to any one of claims 1-6, wherein:

the preparation method comprises the following steps: performing injection molding on all parts made of plastic materials;

s1: inserting a blade into the side wall of the mounting bracket (21) which is just formed, so that the blade is fixed with the mounting bracket (21);

s2: assembling the whole machine head (2);

s3: assembling the handle integrally;

s4: assembling a connecting component (3) between the handle and the machine head (2);

and S5, debugging the whole grass trimmer.