CN208063852U - Grass trimmer height adjustment device - Google Patents

Abstract

The utility model discloses a kind of grass trimmer height adjustment device, belong to grass trimmer field, it is desirable to provide the grass trimmer height adjustment device of handle rotation phenomenon when a kind of reduction cutting operation, its key points of the technical solution are that：A kind of height adjustment device of grass trimmer, including framework lateral plate, wheel arm, wheel, wheel arm top surface are provided with height adjustment mechanism；Height adjustment mechanism includes the screw arbor assembly for being socketed setting successively from the inside to the outside, interior tube assembly and outer tube assembly；Outer tube assembly includes outer tube and is fixedly connected on the connector of outer tube outer wall, and the one end of outer tube far from wheel arm is fixedly connected with the first locating part；Screw arbor assembly includes threaded rod and the second locating part, and threaded rod is pierced by the first locating part and is fixedly connected with handle actuator；Interior tube assembly includes the inner tube being threadedly coupled with threaded rod, and the one end of inner tube far from handle actuator is pierced by outer tube and is hinged by bolt and wheel arm；The arrestment mechanism being connect with the first locating part is provided on handle actuator.

Description

Grass trimmer height adjustment device

Technical field

The utility model is related to grass trimmers, more particularly to grass trimmer height adjustment device.

Background technology

Grass trimmer is widely used in road surface, farm, the weedings field such as gardens, and height adjustment device can freely set mowing Highly, for then needing to adjust to higher position to carry out cutting operation than the bushes of comparatively dense than grassland；Present level is adjusted Type is adjusted generally based on manual rocker, but since vibrations can lead to handle rotation in operation process to influence height.

Utility model content

The purpose of this utility model is to provide a kind of grass trimmer height adjustment device, certainly with handle when reducing cutting operation Turn phenomenon, realizes the advantages of being accurately positioned.

The above-mentioned technical purpose of the utility model technical scheme is that：

A kind of grass trimmer height adjustment device, including framework lateral plate, the wheel arm with framework lateral plate rotation connection, the vehicle The one end of wheel arm far from framework lateral plate is rotatably connected to wheel, and wheel arm top surface is provided with height adjustment mechanism；

The height adjustment mechanism includes the screw arbor assembly for being socketed setting successively from the inside to the outside, interior tube assembly and outer tube group Part；

The outer tube assembly includes outer tube and is fixedly connected on outer tube outer wall for the connection that is rotatablely connected with framework lateral plate Part, the one end of the outer tube far from wheel arm are fixedly connected with the first locating part；

The screw arbor assembly includes threaded rod and ring sets the second locating part on fixed thread bar, second locating part position In in outer tube, the threaded rod is pierced by the first locating part and is fixedly connected with handle actuator；

Said inner tube component includes the inner tube being threadedly coupled with threaded rod, and the one end of said inner tube far from handle actuator is worn Go out outer tube and be hinged by bolt and wheel arm, the bolt is axially perpendicular to framework lateral plate；

The wheel arm is different from the position of position and bolt that framework lateral plate is rotatablely connected；

The arrestment mechanism by positioning pin connection with the first locating part is provided on the handle actuator.

By using above-mentioned technical proposal, rotated in outer tube by rotating handles actuator threaded rod, due to threaded rod One end be fixedly connected with handle actuator, the other end is fixedly connected with the second locating part, and in handle actuator and second The first locating part being fixedly connected with outer tube is provided between locating part, to threaded rod only can outside in pipe rotation without energy Enough generate relative displacement；Inner tube is threadedly coupled with threaded rod, and the one end of inner tube far from handle actuator be pierced by outer tube and with Wheel arm is rotatablely connected by bolt, to which the rotation of threaded rod realizes inner tube along the direction far from or close to the first locating part Displacement；The displacement of inner tube realizes the impetus to wheel arm, and the variation of the length of outer tube is stretched out with inner tube, realizes wheel The adjusting of the height of opposite framework lateral plate, to realize the purpose for adjusting mowing height；Vibrations can lead to handle in operation process Hand rotation influences height and adjusts, is fixedly connected with handle actuator with the first locating part by arrestment mechanism, realizes and subtract The effect that handle rotation phenomenon occurs in few operation process.

Further, the arrestment mechanism includes the axle sleeve being fixedly connected with handle actuator, to be fixedly connected on outer tube remote Positioning plate from wheel arm one end；

The pin hole for being axially perpendicular to positioning plate is offered on the axle sleeve, is offered on the positioning plate and is adapted to positioning pin Location hole；

The positioning pin is plugged in pin hole, and one end of the remotely located plate of positioning pin is fixedly connected with gag lever post.

By using above-mentioned technical proposal, positioning pin is plugged in pin hole and location hole, realizes axle sleeve and positioning plate Connection；Gag lever post can prevent positioning pin from location hole through the grafting occurred and facilitate positioning pin for sliding phenomenon.

Further, the slot of falling J-type is offered on the axle sleeve, and elastic cylindrical pin is inserted in the slot of falling J-type；

The positioning pin is plugged on through pin hole in location hole, is offered on the positioning pin and is adapted to elastic cylindrical pin Circular hole；

The slot of falling J-type includes vertical section and segmental arc, and it is fixed that the vertical section end is more than at a distance from arc section end Position pin is inserted into the depth of location hole.

By using above-mentioned technical proposal, positioning pin is inserted into pin hole, behaviour is adjusted carrying out mowing height to grass trimmer When making, by elastic cylindrical pin by the High definition of positioning pin in the position of segmental arc end, positioning pin is detached from location hole at this time, The rotation of handle actuator is not influenced；After completing the adjusting of mowing height, the height of positioning pin is limited by elastic cylindrical pin It is scheduled on the end of vertical section, positioning pin stretches out handle actuator and is simultaneously inserted into location hole, realizes handle actuator and positioning plate Connection, to reduce the generation of handle actuator rotation phenomenon in operation process.

Further, the compression spring for being set in positioning pin periphery is provided in the pin hole, the remotely located plate of axle sleeve One end is provided with closing in.

By using above-mentioned technical proposal, when elastic cylindrical pin is in straightway end, when positioning pin is plugged in location hole, Elastic-restoring force of the elastic cylindrical pin by compression spring perpendicular to positioning plate acts on so that elastic cylindrical pin drives positioning pin direction Location hole direction presses, to reduce the generation of positioning pin break-off from location hole in operation process.Also, when elasticity When positioning pin is moved to segmental arc end by straight pin, the compression spring on the upside of elastic cylindrical pin is compressed, and elastic cylindrical pin is in compression spring Elastic recovery force effect under abutted in segmental arc end and the slot of falling J-type stabilization, reduce height adjustment elastic cylindrical pin The possibility being detached from from segmental arc.To improve the stability of positioning pin positioning action.

Further, first locating part includes the first bearing seat being fixedly connected with outer coaxial tube, the first axle The opening of bearing is arranged away from outer tube, is embedded in the first bearing seat and is fixed with deep groove ball bearing.

By using above-mentioned technical proposal, first bearing seat and deep groove ball bearing realize the work of the restriction to threaded rod jointly With, and reduce frictional force when threaded rod is rotated relative to outer tube, improve the stability of threaded rod rotation.

Further, second locating part includes the second bearing seat being fixedly and coaxially connected in threaded rod periphery, described The opening of second bearing seat is embedded in the second bearing seat and is fixed with thrust ball bearing towards first bearing seat.

By using above-mentioned technical proposal, under second bearing seat and thrust ball bearing collective effect, reduce threaded rod with The frictional force of first locating part improves the stability of threaded rod rotation.

Further, the handle actuator includes the end cap for being coaxially set in first bearing seat periphery, outside the end cap All to be symmetrically fixedly connected there are two L-shaped handle, the L-shaped handle extends along one end far from first bearing seat；

It is fixedly connected by stop screw between the end cap and threaded rod.

By using above-mentioned technical proposal, the setting of L-shaped handle facilitates the rotation to threaded rod, and end cap is logical with threaded rod Stop screw is crossed to be fixedly connected, realize it is detachable between handle actuator and screw rod, facilitate regulating device cleaning and Repair.

Further, the connector includes the connecting shaft for being vertically fixedly connected on outer tube outer wall, and the connecting shaft passes through Framework lateral plate is simultaneously rotatablely connected with framework lateral plate, and the connecting shaft passes through one end coaxial threaded of framework lateral plate to be connected with locking screw Nail, lock washer is provided between the lock-screw and connecting shaft.

By using above-mentioned technical proposal, outer tube is rotatablely connected by connecting shaft and framework lateral plate, realizes outer tube and machine Frame side plate is stably connected with；Lock-screw reduces the possibility that connecting shaft is detached from framework lateral plate with lock washer, enhances connection Connective stability between axis and framework lateral plate.

Further, said inner tube component further includes U-shaped connecting plate, and the U-shaped connecting plate is pierced by the one of outer tube with inner tube End is fixedly connected；

The wheel arm roof is vertically and fixedly provided with two otic placodes, passes through bolt between two otic placodes and U-shaped connecting plate Rotation connection.

By using above-mentioned technical proposal, the setting of otic placode and U-shaped connecting plate, improves inner tube and the connection of wheel arm is steady It is qualitative.

In conclusion the utility model has the advantages that：

1. height adjustment mechanism is used, to generate the effect for realizing that mowing height is adjusted；

2. arrestment mechanism is used, to generate the effect for reducing handle rotation；

3. deep groove ball bearing and thrust ball bearing are used, to generate the effect for the stability for improving threaded rod rotation.

Description of the drawings

Fig. 1 is the connection relationship diagram for embodying grass trimmer height adjustment device and grass-mowing in the present embodiment；

Fig. 2 is the enlarged diagram in the portions A in Fig. 1；

Fig. 3 is the cross-sectional view for embodying height adjustment mechanism in the present embodiment；

Fig. 4 is the configuration schematic diagram for embodying height adjustment mechanism in the present embodiment.

In figure, 1, framework lateral plate；2, wheel arm；21, otic placode；3, wheel；4, height adjustment mechanism；41, screw arbor assembly； 411, threaded rod；412, the second locating part；4121, second bearing seat；4122, thrust ball bearing；42, interior tube assembly；421, interior Pipe；422, bolt；423, U-shaped connecting plate；43, outer tube assembly；431, outer tube；432, connector；4321, connecting shaft；4322, it locks Tight screw；4323, lock washer；433, the first locating part；4331, first bearing seat；4332, deep groove ball bearing；434, it positions Plate；4341, location hole；5, handle actuator；51, end cap；52, L-shaped handle；53, stop screw；6, arrestment mechanism；61, it positions Pin；611, gag lever post；612, circular hole；62, axle sleeve；621, pin hole；6211, it closes up；622, the slot of falling J-type；6221, vertical section； 6222, segmental arc；63, elastic cylindrical pin；64, compression spring；7, grass-mowing.

Specific implementation mode

The utility model is described in further detail below in conjunction with attached drawing.

Wherein identical parts are presented with like reference characters.It should be noted that word used in the following description Language "front", "rear", "left", "right", "up" and "down" refer to the direction in attached drawing, word " bottom surface " and " top surface ", "inner" and "outside" refers respectively to the direction towards or away from geometric center of specific component.

A kind of grass trimmer, as shown in Figure 1, including grass-mowing 7 and the grass trimmer height for adjusting 7 height of grass-mowing Regulating device.Grass trimmer height adjustment device includes the framework lateral plate 1 and wheel arm for being fixedly connected on 7 opposite sides of grass-mowing 2.The middle part of wheel arm 2 is rotatablely connected with framework lateral plate 1, and one end of 2 length direction of wheel arm is rotatably connected to wheel 3.Wheel 2 top surface of arm is provided with the height adjustment mechanism 4 for adjusting 1 relative altitude of wheel 3 and framework lateral plate.By adjust wheel 3 with The relative altitude of framework lateral plate 1 can realize the adjusting to 7 height of grass-mowing, and then realize the adjusting to mowing height.

As shown in Figures 2 and 3, height adjustment mechanism 4 includes screw arbor assembly 41, the inner tube for being socketed setting successively from the inside to the outside Component 42 and outer tube assembly 43.Outer tube assembly 43 is rotatablely connected with framework lateral plate 1, and interior tube assembly 42 connects with 41 screw thread of screw arbor assembly It connects, inner tube 421 is pierced by outer tube 431 and is rotatablely connected with wheel arm 2.Screw arbor assembly 41 can be rotated relative to outer tube assembly 43, be led to The rotation for crossing screw arbor assembly 41 drives the movement in 41 axial direction of screw arbor assembly of interior tube assembly 42, to realize to wheel arm 2 Impetus so that wheel arm 2 is with motor car wheel 3（Referring to Fig. 1）Along with rotated at 1 rotation connection of framework lateral plate, wheel 3 The height of opposite framework lateral plate 1 realizes the adjusting of mowing height.

As shown in figure 3, outer tube assembly 43 include outer tube 431 and be fixedly connected on 431 outer wall of outer tube be used for and framework lateral plate 1 （Referring to Fig. 2）The connector 432 of rotation connection.Outer tube 431 is far from wheel arm 2（Referring to Fig. 2）One end be fixedly connected with first Locating part 433.First locating part 433 includes the first bearing seat 4331 being fixedly and coaxially connected with outer tube 431, first bearing seat 4331 opening direction deviates from outer tube 431, is embedded in first bearing seat 4331 and is fixed with deep groove ball bearing 4332.

As shown in figure 3, screw arbor assembly 41, which includes threaded rod 411 and ring, sets the second locating part on fixed thread bar 411 412, the second locating part 412 is located in outer tube 431.Second locating part 412 includes being fixedly and coaxially connected in 411 periphery of threaded rod Second bearing seat 4121, the opening of second bearing seat 4121 are embedded solid in second bearing seat 4121 towards first bearing seat 4331 Surely there is thrust ball bearing 4122.Threaded rod 411 is pierced by deep groove ball bearing 4332 and is fixedly connected with handle actuator 5.

As shown in figure 3, interior tube assembly 42 includes the inner tube 421 being threadedly coupled with threaded rod 411, inner tube 421 is far from handle One end of actuator 5 is pierced by outer tube 431 and is fixedly connected with U-shaped connecting plate 423.Interior tube assembly 42 by U-shaped connecting plate 423 with Wheel arm 2（Referring to Fig. 2）It is hinged.Articulated position, wheel arm 2 and the framework lateral plate 1 of interior tube assembly 42 and wheel arm 2（Referring to figure 2）The position of rotation connection, the two position are different.When inner tube 421 carries out impetus to wheel arm 2, wheel arm 2 being capable of edge It is rotated at rotation connection with framework lateral plate 1, realizes variation of the wheel 3 with respect to the relative altitude of framework lateral plate 1.

As shown in Fig. 2, connector 432 includes the connecting shaft 4321 for being vertically fixedly connected on 431 outer wall of outer tube, connecting shaft 4321 pass through framework lateral plate 1 and are rotatablely connected with framework lateral plate 1.Connecting shaft 4321 passes through one end coaxial threaded of framework lateral plate 1 It is connected with lock-screw 4322, lock washer 4323 is provided between lock-screw 4322 and connecting shaft 4321.

As shown in Fig. 2, 2 roof of wheel arm is vertically and fixedly provided with two otic placodes 21, two otic placodes 21 and U-shaped connecting plate 423 it Between it is hinged by bolt 422, bolt 422 is axially perpendicular to framework lateral plate 1.The setting of otic placode 21 and U-shaped connecting plate 423, carries The high connective stability of inner tube 421 and wheel arm 2.

As shown in figure 4, handle actuator 5 includes the end cap 51 for being coaxially set in 4331 periphery of first bearing seat, end cap 51 Periphery is symmetrically fixedly connected there are two L-shaped handle 52, and L-shaped handle 52 extends along one end far from first bearing seat 4331.End cap It is fixedly connected by stop screw 53 between 51 and threaded rod 411.By driving L-shaped handle 52 to rotate, realize that end cap 51 drives The effect that threaded rod 411 rotates, and end cap 51 and second bearing seat 4121 are located at the both sides of first bearing seat 4331（Ginseng See Fig. 3）, realize the restriction of the clamping to threaded rod 411 so that threaded rod 411 can only in the outer tube 431 rotation without with it is outer Pipe 431 generates relative displacement.

As shown in figure 4, being provided with the brake being connect by positioning pin 61 with the first locating part 433 on handle actuator 5 Structure 6.Arrestment mechanism 6 includes the axle sleeve 62 being fixedly connected with end cap 51, is fixedly connected on first bearing seat 4331 by proximal cap 51 The positioning plate 434 of one end periphery.The pin hole 621 for being axially perpendicular to positioning plate 434 is offered on axle sleeve 62, is opened on positioning plate 434 Equipped with the location hole 4341 being adapted to positioning pin 61.Positioning pin 61 is plugged in pin hole 621,61 remotely located plate 434 of positioning pin One end be fixedly connected with gag lever post 611.The connection that pin hole 621 and location hole 4341 are realized by positioning pin 61, realizes axis The connection of set 62 and positioning plate 434.When positioning pin 61 is inserted into pin hole 621, gag lever post 611 can prevent positioning pin 61 from calmly Through the generation for sliding phenomenon in the hole 4341 of position.

As shown in Figure 3 and Figure 4, the compression spring 64 for being set in 61 periphery of positioning pin is provided in pin hole 621, axle sleeve 62 is far from fixed One end of position plate 434 is provided with closing in 6211.The slot of falling J-type 622 is offered on axle sleeve 62, and Elastic Circular is inserted in the slot of falling J-type 622 Pin 63.The circular hole 612 being adapted to elastic cylindrical pin 63 is offered on positioning pin 61, position and the positioning pin 61 of circular hole 612 pass through Height when pinned hole 621 is plugged in location hole 4341 is corresponding.

As shown in figure 4, the slot of falling J-type 622 includes vertical section 6221 and segmental arc 6222.6221 end of vertical section and segmental arc The distance of 6222 ends is more than the depth that positioning pin 61 is inserted into location hole 4341.Positioning pin 61 is inserted into pin hole 621, to cutting When careless machine carries out mowing height adjusting operation, by elastic cylindrical pin 63 by the High definition of positioning pin 61 at 6222 end of segmental arc The position in portion, the location hole 4341 of the disengaging of positioning pin 61 at this time, does not influence the rotation of handle actuator 5.When completion mowing height After adjusting, by elastic cylindrical pin 63 by the High definition of positioning pin 61 in the end of vertical section 6221, positioning pin 61 stretches out handle Hand-drive part 5 is simultaneously inserted into location hole 4341, the connection of handle actuator 5 and positioning plate 434 is realized, to reduce operation process The generation of middle 5 rotation phenomenon of handle actuator.

As shown in figure 4, when elastic cylindrical pin 63 is in 6221 end of vertical section, positioning pin 61 is plugged in location hole 4341, Elastic-restoring force of the elastic cylindrical pin 63 by compression spring 64 perpendicular to positioning plate 434 acts on so that elastic cylindrical pin 63 drives Positioning pin 61 is pressed towards 4341 direction of location hole, reduces the break-off from location hole 4341 of positioning pin 61 in operation process Generation.When positioning pin 61 is moved to 6222 end of segmental arc by elastic cylindrical pin 63, the compression spring of 63 upside of elastic cylindrical pin 64 is compressed, and elastic cylindrical pin 63 is steady in 6222 end of segmental arc and the slot of falling J-type 622 under the elastic recovery force effect of compression spring 64 It is fixed to abut, reduce the possibility that height adjustment elastic cylindrical pin 63 is detached from from segmental arc 6222, it is fixed to improve positioning pin 61 The stability of position effect.

Specific implementation process：Threaded rod 411 rotation, inner tube 421 in outer tube 431 is driven to exist by rotating L-shaped handle 52 It is realized to vehicle along the direction displacement far from or close to first bearing seat 4331, the displacement of inner tube 421 under the action of threaded rod 411 The impetus of wheel arm 2 stretches out the variation of the length of outer tube 431 with inner tube 421, realizes height of the wheel 3 with respect to framework lateral plate 1 The purpose for adjusting mowing height is realized in the adjusting of degree.

When carrying out mowing height to grass trimmer and adjusting operation, by elastic cylindrical pin 63 by the High definition of positioning pin 61 Position in 6222 end of segmental arc, the location hole 4341 of the disengaging of positioning pin 61 at this time, does not influence the rotation of handle actuator 5.When After the adjusting for completing mowing height, by elastic cylindrical pin 63 by the High definition of positioning pin 61 in the end of vertical section 6221, Positioning pin 61 stretches out handle actuator 5 and is inserted into location hole 4341, realizes the connection of handle actuator 5 and positioning plate 434, from And reduce the generation of 5 rotation phenomenon of handle actuator in operation process.

This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, ability Field technique personnel can as needed make the present embodiment the modification of not creative contribution after reading this specification, but As long as all being protected by Patent Law in the right of the utility model.

Claims (9)

1. a kind of grass trimmer height adjustment device, it is characterized in that：Including framework lateral plate (1) and wheel arm (2), the wheel arm (2) middle part is rotatablely connected with framework lateral plate (1), and one end of wheel arm (2) length direction is rotatably connected to wheel (3), institute It states wheel arm (2) top surface and is provided with height adjustment mechanism (4)；

The height adjustment mechanism (4) include the screw arbor assembly (41) for being socketed setting successively from the inside to the outside, interior tube assembly (42) and Outer tube assembly (43)；

The outer tube assembly (43) includes outer tube (431) and is fixedly connected on outer tube (431) outer wall for turning with framework lateral plate (1) The connector (432) of dynamic connection, the one end of the outer tube (431) far from wheel arm (2) are fixedly connected with the first locating part (433)；

The screw arbor assembly (41) includes threaded rod (411) and ring sets the second locating part (412) on fixed thread bar (411), Second locating part (412) is located in outer tube (431), and the threaded rod (411) is pierced by the first locating part (433) and fixed company It is connected to handle actuator (5)；

Said inner tube component (42) includes the inner tube (421) being threadedly coupled with threaded rod (411), and said inner tube (421) is far from handle One end of hand-drive part (5) is pierced by outer tube (431) and is hinged by bolt (422) and wheel arm (2), the bolt (422) It is axially perpendicular to framework lateral plate (1)；

The wheel arm (2) is different from position and the position of bolt (422) that framework lateral plate (1) is rotatablely connected；

It is provided with the arrestment mechanism being connect by positioning pin (61) with the first locating part (433) on the handle actuator (5) (6)。

2. grass trimmer height adjustment device according to claim 1, it is characterized in that：The arrestment mechanism (6) includes and handle Axle sleeve (62) that hand-drive part (5) is fixedly connected is fixedly connected on positioning plate of the outer tube (431) far from wheel arm (2) one end (434)；

The pin hole (621) for being axially perpendicular to positioning plate (434) is offered on the axle sleeve (62), is opened on the positioning plate (434) Equipped with the location hole (4341) being adapted to positioning pin (61)；

The positioning pin (61) is plugged in pin hole (621), and one end of the remotely located plate of the positioning pin (61) (434), which is fixed, to be connected It is connected to gag lever post (611).

3. grass trimmer height adjustment device according to claim 2, it is characterized in that：J is offered down on the axle sleeve (62) Type groove (622), the slot of falling J-type (622) is interior to be inserted with elastic cylindrical pin (63)；

The positioning pin (61) is plugged on through pin hole (621) in location hole (4341), offered on the positioning pin (61) with The circular hole (612) of elastic cylindrical pin (63) adaptation；

The slot of falling J-type (622) includes vertical section (6221) and segmental arc (6222), vertical section (6221) end and circular arc The distance of section end is more than the depth that positioning pin (61) is inserted into location hole (4341).

4. grass trimmer height adjustment device according to claim 3, it is characterized in that：It is provided with set in the pin hole (621) It is located at the compression spring (64) of positioning pin (61) periphery, one end of the remotely located plate of the axle sleeve (62) (434) is provided with closing in (6211)。

5. grass trimmer height adjustment device according to claim 1, it is characterized in that：First locating part (433) includes The opening of the first bearing seat (4331) being fixedly and coaxially connected with outer tube (431), the first bearing seat (4331) deviates from outer tube (431) it is arranged, is embedded in the first bearing seat (4331) and is fixed with deep groove ball bearing (4332).

6. grass trimmer height adjustment device according to claim 5, it is characterized in that：Second locating part (412) includes It is fixedly and coaxially connected the second bearing seat (4121) in threaded rod (411) periphery, the opening court of the second bearing seat (4121) To first bearing seat (4331), it is embedded in the second bearing seat (4121) and is fixed with thrust ball bearing (4122).

7. grass trimmer height adjustment device according to claim 6, it is characterized in that：The handle actuator (5) includes same Axle sleeve is located at the end cap (51) of first bearing seat (4331) periphery, and end cap (51) periphery is symmetrically fixedly connected with that there are two L-shaped Handle (52), the L-shaped handle (52) extend along one end far from first bearing seat (4331)；

It is fixedly connected by stop screw (53) between the end cap (51) and threaded rod (411).

8. grass trimmer height adjustment device according to claim 1, it is characterized in that：The connector (432) includes vertical It is fixedly connected on the connecting shaft (4321) of outer tube (431) outer wall, the connecting shaft (4321) passes through framework lateral plate (1) and and rack Side plate (1) is rotatablely connected, and the connecting shaft (4321) passes through one end coaxial threaded of framework lateral plate (1) to be connected with lock-screw (4322), it is provided with lock washer (4323) between the lock-screw (4322) and connecting shaft (4321).

9. grass trimmer height adjustment device according to claim 1, it is characterized in that：Said inner tube component (42) further includes U Type connecting plate (423), one end that the U-shaped connecting plate (423) is pierced by outer tube (431) with inner tube (421) are fixedly connected；

Wheel arm (2) roof is vertically and fixedly provided with two otic placodes (21), two otic placodes (21) and U-shaped connecting plate (423) Between pass through bolt (422) be rotatablely connected.