CN109168559A

CN109168559A - A kind of grass trimmer with sawtooth that municipal administration gardens use

Info

Publication number: CN109168559A
Application number: CN201811171995.2A
Authority: CN
Inventors: 陶如意
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-04-11
Filing date: 2017-04-11
Publication date: 2019-01-11
Also published as: CN106961912B; CN109168561A; CN106961912A; CN109168560A

Abstract

The invention belongs to weeding technique fields, more particularly to a kind of grass trimmer with sawtooth that municipal gardens use, it includes amplifying gear, driving gear, accelerating gear, putting item, limit centering block, jacking block, turntable, inner circle top surface, serrated knife, draw runner, the wherein use of train and pendulum item, limit centering block, jacking block, the use for pushing up inner circle top surface on spring and turntable, so that when equipment weeding of the present invention, when jacking block and inner circle top surface contact, serrated knife can be rotated with bigger speed, quickly weeding；Draw runner is installed between two draw runner rails, conducting bar on the guide groove and draw runner rail at draw runner both ends cooperates, design is so that draw runner pin moves linearly in draw runner in this way, draw runner transverse movement on draw runner rail, it ensure that serrated knife is for linear motion, the saw sword in serrated knife allow to form dragsaw effect to grass；Equipment of the present invention makes serrated knife that can not only make rotating motion, but also can be for linear motion, and weeding ratio improves, and structure is simple, and using effect is good.

Description

A kind of grass trimmer with sawtooth that municipal administration gardens use

Technical field

The invention belongs to weeding technique field more particularly to a kind of grass trimmers with sawtooth that municipal gardens use.

Background technique

There is the various weeder such as hanging, rotary, reciprocating in weeding technique field at present, blade utilizes the height of engine Speed rotation output speed greatly improves, and saves the activity duration of weeding worker, reduces a large amount of human resources.Mainstream is mowed Blade is housed, blade is mowed using the high speed rotation of engine, such equipment weeding effect on the output shaft of the engine of machine Rate is low, and the every work of weeder just needs to rest for a period of time, therefore designing in the case where not improving manufacturing cost one kind can be with The equipment for improving weeding ratio is necessary.

The present invention design a kind of grass trimmer with sawtooth that municipal gardens use solve the problems, such as it is as above.

Summary of the invention

To solve drawbacks described above in the prior art, the present invention discloses a kind of mowing with sawtooth that municipal gardens use Machine, it adopts the following technical solutions to realize.

A kind of grass trimmer with sawtooth that municipal administration gardens use, it is characterised in that: it includes draw runner rail, side stay, stull, electricity Machine support, motor, machine shaft, output shaft, latch, amplification gear, intermediate gear, set axis, turntable, mowing shaft, input shaft, Draw runner, swing arm, serrated knife, draw runner pin, adjustment disk, adjustment disk support, leaf spring, limit centering block, accelerating gear, conducting bar, inner circle top surface, Transition face, first rotating shaft, the second shaft, set axial cone tooth, output axial cone tooth, output shaft support, driving gear, pendulum item, mowing axis Cover fixed structure, input shaft support, input axial cone tooth, mowing shaft cone tooth, mowing axle sleeve, top spring, slide bar fixed structure, Plate spring fixing structure, jacking block, slide bar, straight pin, guide groove, wherein motor is by being symmetrically mounted on two motor branch of motor lower end Support is mounted in stull, and stull lower end two sides are symmetrically installed there are two side stay, and each side stay lower end is mounted on draw runner rail, draw runner Be mounted on conducting bar on rail inner face, draw runner be installed between two conducting bars, be provided with slot among draw runner, the guide groove at draw runner both ends and Conducting bar cooperates；Symmetrically there are three adjustment disks to support for installation on the downside of stull, and adjustment disk is mounted on adjustment disk support downside, adjusts It is provided with inner circle top surface and transition face in section disc side, the circular hole of coaxial line is provided among stull and adjustment disk；Axle position is covered in motor On the outside of shaft, set axial cone tooth, driving gear and turntable are sequentially arranged on the outside of set axis, and set axis passes through adjustment disk and adjustment disk position Between driving gear and turntable；Output shaft support is mounted on the upside of stull, and output shaft is mounted in output shaft support, output shaft The other end is equipped with output axial cone tooth, set axial cone tooth and output axial cone tooth cooperation；First rotating shaft and the second shaft are installed in cross In support, intermediate gear is mounted on the second shaft lower end periphery, and amplification gear is mounted on the periphery of first rotating shaft lower end, is added Fast gear is mounted on first rotating shaft periphery, and is located at amplification gear lower end, is driven gear and intermediate gear engagement, is amplified tooth Wheel and intermediate gear engagement；One pendulum item, a slide bar, a slide bar fixed structure, a top spring and a jacking block composition One group, 10 groups circumferentially uniform to be mounted on disk edge；10 groups of mounting means and structure is identical, for appointing in 10 groups It anticipates one group, pendulum item is mounted on the upside of turntable by straight pin, and slide bar fixed structure is mounted on the upside of turntable, and slide bar is solid across slide bar Determine structure, limited centering block is installed in slide bar one end, and the slide bar other end is equipped with jacking block, jacking block and the cooperation of adjustment disk periphery；Push up bullet Spring is nested on slide bar periphery and between jacking block and slide bar fixed structure；Swing arm one end is mounted on machine shaft lower end, The other end is provided with circular hole, and draw runner pin is mounted in circular hole, and latch is mounted on the upside of draw runner pin；Swing arm is located on the downside of turntable, and position On the upside of draw runner, latch and pendulum item cooperation, draw runner pin are slided in the slot of draw runner；Input shaft support is mounted on the downside of draw runner, defeated Enter axis to be mounted in input shaft support upper end circular hole, input axial cone tooth is mounted on input shaft；The installation of mowing axle sleeve fixed structure On the downside of draw runner, mowing axle sleeve is mounted on mowing axle sleeve fixed structure, and mowing shaft is mounted in mowing axle sleeve, mowing shaft Cone tooth is mounted on mowing shaft periphery, and mowing shaft cone tooth and input axial cone tooth engagement, and mowing shaft lower end is equipped with Serrated knife；Plate spring fixing structure is mounted on the upside of turntable, and leaf spring one end is mounted in plate spring fixing structure, and the other end is mounted on pendulum On item.

As the further improvement of this technology, pushing up spring is a contraction spring.

Relative to traditional weeding technique, the present invention covers the output axial cone installed on the set axial cone tooth and output shaft that axis upper end is installed Tooth cooperation, this structure can change powerdriven direction；Stull lower end two sides are symmetrically installed each side stay there are two side stay Lower end is mounted on draw runner rail, and conducting bar is equipped on draw runner rail inner face, draw runner is equipped between two conducting bars, draw runner both ends Guide groove and conducting bar cooperate, and are designed in this way so that draw runner pin transverse shifting in draw runner, draw runner move linearly on draw runner rail, It ensure that mowing shaft can move along a straight line, the saw sword in serrated knife allow to form dragsaw effect to grass；Pendulum item passes through circle Pin is mounted on the upside of turntable, and slide bar fixed structure is mounted on the upside of turntable, and limited centering block, other end installation are installed in slide bar one end There are jacking block, jacking block and adjusting disc side cooperation, slide bar passes through slide bar fixed structure, and top spring is mounted on slide bar periphery and is located at Between jacking block and slide bar fixed structure, plate spring fixing structure is mounted on the upside of turntable, and leaf spring is mounted on plate spring fixing structure and card Between tooth；The effect designed in this way is: by the contact between jacking block and adjustment disk, in jacking block and adjusting disc side contact, Under the action of pushing up spring, the swing of limit centering block limitation pendulum item allows latch to pass through pendulum band turn disk rotation；Work as latch When contacting with inner circle top surface, spring elongation is pushed up, limit centering block is pulled to be detached from item is put, pendulum item can be swung, and latch rotation drive adds The rotation of fast gear, and the mechanisms such as amplification gear, intermediate gear, driving gear is driven to enable serrated knife with bigger speed Rotation；Plate spring fixing structure is mounted on the upside of turntable, and leaf spring is mounted between plate spring fixing structure and latch, and the effect of leaf spring is Certain restoring force is applied to pendulum item, pendulum item is allowed to be always maintained at radial direction.

When using equipment weeding of the present invention, motor is started turning, and is driven machine shaft rotation, is mounted on machine shaft The swing arm of lower end rotates with it, and draw runner pin and latch also move in a circle, and draw runner pin is mounted in draw runner, drives draw runner in cunning It is moved on rail, while draw runner pin moves in the slot in draw runner；Initial jacking block and adjustment disk outer circle face contact, push up spring pressure Contracting, limit centering block and pendulum item cooperate, and the swing of limitation pendulum item, pendulum item and turntable are opposing stationary shown, and latch band movable pendulum item moves, and turn Disk also rotates with it, so drive set axis rotation, set axis drive set axial cone tooth mounted thereto rotate, set axial cone tooth drive and Engagement output axial cone tooth, output shaft starts turning, and drives input shaft rotation connect by flexible axle, the input on input shaft Axial cone tooth drives the mowing shaft cone tooth rotation being engaged with, and the rotation of mowing shaft drives serrated knife rotation, and such serrated knife exists It starts turning under the drive of mowing shaft, while moving along a straight line under the drive of draw runner pin again, serrated knife not only does fixed-axis rotation, but also does Linear motion is formed and is acted on the dragsaw of grass, being capable of quick weeding.

Motor continues to rotate, and jacking block slides into the transition face of adjustment disk, into inner circle top surface, limits centering block in the effect of top spring Under it is radially movable, no longer limitation pendulum item, pendulum item can be swung under the action of latch, turntable no longer with the rotation of latch and Rotation, latch continue to rotate under the drive of machine shaft, turntable rotational angle starts to lag the angle of latch rotation；Latch Certain angle is turned over, before jacking block enters adjustment disk periphery via transition face from inner circle top surface, latch moves to acceleration tooth At wheel, accelerating gear is driven, and first rotating shaft and accelerating gear rotate synchronously, and drives the rotation of amplification gear, amplification gear is again The rotation of intermediate gear is driven, intermediate gear drives the rotation of driving gear, and set axis rotates with it, and set axial cone tooth is driven to turn Dynamic, set axial cone tooth drives the rotation for the output axial cone tooth being engaged with again, and output shaft also rotates with it, and output shaft passes through flexible axle band The input shaft of dynamic engagement rotates, and the input axial cone tooth rotation on input shaft drives the mowing shaft of engagement to bore tooth rotation, because putting Gear wheel is exaggerated transmission ratio, and mowing shaft accelerates rotation, and the serrated knife for being mounted on mowing shaft lower end also accelerates to rotate.Turntable The angle of lag and slide calliper rule is turned over faster speed under the drive of accelerating gear and latch.When jacking block from inner circle top surface via After transition face enters adjustment disk periphery, spring-compressed is pushed up, limit centering block starts limitation pendulum item again and swings, and latch continues to rotate, will It drives turntable to start with the rotation of former speed, while serrated knife speed falls to original speed again, continues weeding.Weeder to When preceding movement weeding, faster speed can accelerate weeding ratio, generally in order to rev up, using the motor of more strength, and Using equipment of the present invention in the case where not using powerful machine, only accelerate front velocity of rotation, can achieve same Effect saves resource and manufacturing cost.

Detailed description of the invention

Fig. 1 is global facility distribution schematic diagram.

Fig. 2 is overall structure perspective view.

Fig. 3 is overall structure birds-eye perspective.

Fig. 4 is support construction schematic diagram.

Fig. 5 is turntable structure schematic diagram.

Fig. 6 is wheel train structure schematic diagram.

Fig. 7 is set axle construction cross-sectional view.

Fig. 8 is drive mechanism schematic diagram.

Fig. 9 is adjustment disk jacking block drive mechanism schematic diagram.

Figure 10 is Slide bar structure schematic diagram.

Figure 11 is serrated knife drive mechanism schematic diagram.

Figure 12 is swing arm structure schematic diagram.

Figure 13 is latch movement schematic diagram.

Figure 14 is serrated knife movement schematic diagram.

Figure label title: 1, draw runner rail, 3, side stay, 4, stull, 5, motor support, 6, motor, 7, machine shaft, 9, defeated Shaft, 10, latch, 11, amplification gear, 12, intermediate gear, 13, set axis, 14, turntable, 15, mowing shaft, 16, input shaft, 17, draw runner, 18, swing arm, 19, serrated knife, 20, draw runner pin, 21, adjustment disk, 22, adjustment disk support, 23, leaf spring, 24, limit pendulum Block, 25, accelerating gear, 26, conducting bar, 27, inner circle top surface, 28, transition face, 29, first rotating shaft, the 30, second shaft, 31, set axis Cone tooth, 32, output axial cone tooth, 33, output shaft support, 34, driving gear, 35, pendulum item, 36, mowing axle sleeve fixed structure, 37, Input shaft support, 38, input axial cone tooth, 39, mowing shaft cone tooth, 40, mowing axle sleeve, 41, top spring, 42, slide bar fixed knot Structure, 43, plate spring fixing structure, 44, jacking block, 45, slide bar, 46, straight pin, 47, guide groove.

Specific embodiment

When using equipment weeding of the present invention, as shown in Figure 1, 2, 3, it includes draw runner rail 1, side stay 2, stull 3, electricity Machine support 5, machine shaft 7, output shaft 9, latch 10, amplification gear 11, intermediate gear 12, set axis 13, turntable 14, is cut motor 6 Careless shaft 15, input shaft 16, draw runner 17, swing arm 18, serrated knife 19, draw runner pin 20, adjustment disk 21, adjustment disk support 22, leaf spring 23, centering block 24, accelerating gear 25, conducting bar 26, inner circle top surface 27, transition face 28, first rotating shaft 29, the second shaft 30, set axis are limited Bore tooth 31, output axial cone tooth 32, output shaft support 33, driving gear 34, pendulum item 35, mowing axle sleeve fixed structure 36, input shaft Support 37, input axial cone tooth 38, mowing shaft cone tooth 39, mowing axle sleeve 40, top spring 41, slide bar fixed structure 42, leaf spring are solid Structure 43, jacking block 44, slide bar 45, straight pin 46, guide groove 47 are determined, wherein motor 6 is by being symmetrically mounted on electricity as shown in Fig. 1,4 Two motor supports 5 of 6 lower end of machine are mounted in stull 3, and 3 lower end two sides of stull are symmetrically installed each side stay there are two side stay 2 2 lower ends are mounted on draw runner rail 1, and conducting bar 26 is mounted on 1 inner face of draw runner rail, is equipped with draw runner between two conducting bars 26 17, slot is provided among draw runner 17, the guide groove 47 and conducting bar 26 at 17 both ends of draw runner cooperate；As shown in figure 4,3 downside of stull is right Claim ground installation there are three adjustment disk support 22, adjustment disk 21 is mounted on 22 downside of adjustment disk support, and adjustment disk is provided on 21 side The circular hole of coaxial line is provided among inner circle top surface 27 and transition face 28, stull 3 and adjustment disk 21；As shown in fig. 7, set axis 13 is located at 7 outside of machine shaft, set axial cone tooth 31, driving gear 34 and turntable 14 are sequentially arranged at 13 outside of set axis, and set axis 13, which passes through, to be adjusted It saves disk 21 and adjustment disk 21 is located between driving gear 34 and turntable 14；As shown in figure 5, output shaft support 33 is mounted on stull 3 Upside, output shaft 9 are mounted in output shaft support 33, and 9 other end of output shaft is equipped with output axial cone tooth 32, cover 31 He of axial cone tooth Axial cone tooth 32 is exported to cooperate；As shown in Figure 5,6, first rotating shaft 29 and the second shaft 30 are installed in stull 3, intermediate gear 12 It is mounted on 30 lower end periphery of the second shaft, amplification gear 11 is mounted on 29 lower end periphery of first rotating shaft, accelerating gear 25 are mounted on 29 periphery of first rotating shaft, and are located at amplification 11 lower end of gear, drive gear 34 and intermediate gear 12 to engage, put Gear wheel 11 and intermediate gear 12 engage；As shown in figure 8, the slide bar 45, one of a pendulum item 35, one slide bar fixed structure 42, One top spring 41 and jacking block 44 form one group, and 10 groups circumferentially uniform to be mounted on 14 edge of turntable；As shown in figure 9,10 The mounting means and structure of group are identical, for any one group in 10 groups, put item 35 by straight pin 46 and are mounted on turntable 14 upsides, as shown in Figure 10, slide bar fixed structure 42 are mounted on 14 upside of turntable, and slide bar 45 passes through slide bar fixed structure 42, sliding Limited centering block 24 is installed in 45 one end of bar, and the slide bar other end is equipped with jacking block 44, jacking block 44 and the cooperation of 21 periphery of adjustment disk；Push up bullet Spring 41 is nested on 45 periphery of slide bar and between jacking block 44 and slide bar fixed structure 42；As shown in figure 12, swing arm 18 1 End is mounted on 7 lower end of machine shaft, and the other end is provided with circular hole, and draw runner pin 20 is mounted in circular hole, and latch 10 is mounted on draw runner pin 20 upsides；As shown in figure 8, swing arm 18 is located at 14 downside of turntable, and is located at 17 upside of draw runner, latch 10 and pendulum item 35 cooperate, sliding Item pin 20 slides in the slot of draw runner 17；As shown in figure 11, input shaft support 37 is mounted on 17 downside of draw runner, and input shaft 16 is installed It is supported in 37 upper end circular holes in input shaft, input axial cone tooth 38 is mounted on input shaft 16；Mowing axle sleeve fixed structure 36 is installed In 17 downside of draw runner, mowing axle sleeve 40 is mounted on mowing axle sleeve fixed structure 36, and mowing shaft 15 is mounted on mowing axle sleeve 40 Interior, mowing shaft cone tooth 39 is mounted on 15 periphery of mowing shaft, and mowing shaft cone tooth 39 is engaged with input axial cone tooth 38, 15 lower end of mowing shaft is equipped with serrated knife 19；As shown in figure 9, plate spring fixing structure 43 is mounted on 14 upside of turntable, leaf spring 23 One end is mounted in plate spring fixing structure 43, and the other end is mounted on pendulum item 35.

Pushing up spring is a contraction spring.

In conclusion the present invention covers the output axial cone tooth installed on the set axial cone tooth 31 and output shaft 9 that 13 upper end of axis is installed 32 cooperations, this structure can change powerdriven direction；3 lower end two sides of stull are symmetrically installed there are two side stay 2, each side It supports 2 lower ends and is mounted on draw runner rail 1, conducting bar 26 is installed on 1 inner face of draw runner rail, draw runner is installed between two conducting bars 26 17, the guide groove 47 and conducting bar 26 at 17 both ends of draw runner cooperate, and are designed in this way so that the transverse shifting in draw runner 17 of draw runner pin 20, Draw runner 17 moves linearly on draw runner rail 1, ensure that mowing shaft 15 can move along a straight line, and makes the saw sword in serrated knife 19 can To form dragsaw effect to grass；Pendulum item 35 is mounted on 14 upside of turntable by straight pin 46, and slide bar fixed structure 42, which is mounted on, to be turned Limited centering block 24 is installed in 14 upside of disk, 45 one end of slide bar, and the other end is equipped with jacking block 44, and jacking block 44 and 21 side of adjustment disk are matched It closes, slide bar 45 passes through slide bar fixed structure 42, and top spring 41 is mounted on 45 periphery of slide bar and fixes positioned at jacking block 44 and slide bar Between structure 42, plate spring fixing structure 43 is mounted on 14 upside of turntable, and leaf spring 23 is mounted on plate spring fixing structure 43 and latch 10 Between；The effect designed in this way is: by the contact between jacking block 44 and adjustment disk 21, connecing in jacking block 44 and 21 side of adjustment disk When touching, under the action of pushing up spring 41, the swing of the limit limitation pendulum item 35 of centering block 24 drives latch 10 by pendulum item 35 Turntable 14 rotates；When latch 10 and inner circle top surface 27 contact, top spring 41 is stretched, and limit centering block 24 and pendulum item 35 is pulled to be detached from, Pendulum item 35 can be swung, and the rotation of latch 10 drives the rotation of accelerating gear 25, and driven amplification gear 11, intermediate gear 12, driven The mechanisms such as moving gear 34 enable serrated knife 19 to rotate with bigger speed；Plate spring fixing structure 43 is mounted on turntable 14 Side, leaf spring 23 are mounted between plate spring fixing structure 43 and latch 10, and the effect of leaf spring 23 is to apply certain return to pendulum item 35 Multiple power allows pendulum item 35 to be always maintained at radial direction.

When using equipment weeding of the present invention, motor 6 is started turning, and machine shaft 7 is driven to rotate, and is mounted on motor and is turned The swing arm 18 of 7 lower end of axis rotates with it, and draw runner pin 20 and latch 10 also move in a circle, and draw runner pin 20 is mounted on draw runner 17 It is interior, drive draw runner 17 to move on draw runner rail 1, while draw runner pin 20 moves in the slot in draw runner 17；Such as a institute in Figure 13 Show, 21 outer circle face contact of initial jacking block 44 and adjustment disk, top spring 41 compresses, and limit centering block 24 and pendulum item 35 cooperate, limitation pendulum item 35 swing, pendulum item 35 and turntable 14 are opposing stationary shown, and latch 10 is moved with movable pendulum item 35, and turntable 14 also rotates with it, into And set axis 13 is driven to rotate, set axis 13 drives set axial cone tooth 31 mounted thereto to rotate, and the set drive of axial cone tooth 31 is engaged with Output axial cone tooth 32, output shaft 9 starts turning, and drives the rotation of input shaft 16 connect by flexible axle, defeated on input shaft 16 Entering axial cone tooth 38 drives the mowing shaft cone tooth 39 being engaged with to rotate, and the rotation of mowing shaft 15 drives serrated knife 19 to rotate, this Sample serrated knife 19 starts turning under the drive of mowing shaft 15, while moving along a straight line under the drive of draw runner pin 20 again, serrated knife 19 not only do fixed-axis rotation, but also move in a straight line, formed to grass dragsaw act on, can quick weeding, as in Figure 14 a, b, C, shown in d.The motor 6 as shown in the b in Figure 13 continues to rotate, and jacking block 44 slides into the transition face 28 of adjustment disk 21, into interior dome Face 27, limit centering block 24 is radially movable under the action of pushing up spring 41, no longer limitation pendulum item 35, effect of the pendulum item 35 in latch 10 Under can swing, turntable 14 is no longer rotated with the rotation of latch 10, latch 10 continue under the drive of machine shaft 7 turn Dynamic, 14 rotational angle of turntable starts to lag the angle that latch 10 rotates；Latch 10 turns over certain angle, when jacking block 44 is from interior dome Before face 27 enters 21 periphery of adjustment disk via transition face 28, latch 10 is moved at accelerating gear 25,25 quilt of accelerating gear It drives, first rotating shaft 29 and accelerating gear 25 rotate synchronously, and drive the rotation of amplification gear 11, and amplification gear 11 drives intermediate again The rotation of gear 12, intermediate gear 12 drive the rotation of driving gear 34, and set axis 13 rotates with it, and drives 31 turns of axial cone tooth of set Dynamic, set axial cone tooth 31 drives the rotation for the output axial cone tooth 32 being engaged with again, and output shaft 9 also rotates with it, and output shaft 9 passes through Flexible axle drives the input shaft 16 of engagement to rotate, and the input rotation of axial cone tooth 38 on input shaft 16 drives the mowing shaft of engagement to bore tooth 39 rotations, because amplification gear 11 is exaggerated transmission ratio, mowing shaft 15 accelerates rotation, is mounted on the saw of 15 lower end of mowing shaft Serrated knife 19 also accelerates rotation.Turntable 14 turns over lag and slide calliper rule under the drive of accelerating gear 25 and latch 10 with faster speed Angle.After jacking block 44 enters 21 periphery of adjustment disk via transition face 28 from inner circle top surface 27, top spring 41 compresses, limit pendulum Block 24 starts limitation pendulum item 35 again and swings, and latch 10 continues to rotate, and turntable 14 will be driven to start with the rotation of former speed, while sawtooth 19 speed of knife falls to original speed again, continues weeding, and as shown in figure 14, the movement of serrated knife is ellipse, then entirely The shape of equipment is also ellipse, can increase its usage in the space for saving side using structure of the invention.Such as figure In 14 shown in b, when weeder travels forward weeding, faster speed can accelerate weeding ratio, generally in order to rev up, It using the motor 6 of more strength, and uses equipment of the present invention in the case where not using powerful machine 6, only accelerates front and turn Dynamic speed, can achieve same effect, save resource and manufacturing cost.

Claims

1. a kind of grass trimmer with sawtooth that municipal administration gardens use, it is characterised in that: it includes draw runner rail, side stay, stull, motor Support, motor, machine shaft, output shaft, latch, amplification gear, intermediate gear, set axis, turntable, mowing shaft, input shaft, cunning Item, swing arm, serrated knife, draw runner pin, adjustment disk, adjustment disk support, leaf spring, limit centering block, accelerating gear, conducting bar, inner circle top surface, mistake Cross face, first rotating shaft, the second shaft, set axial cone tooth, output axial cone tooth, output shaft support, driving gear, pendulum item, mowing axle sleeve Fixed structure, input shaft support, input axial cone tooth, mowing shaft cone tooth, mowing axle sleeve, top spring, slide bar fixed structure, plate Spring fixed structure, jacking block, slide bar, straight pin, guide groove, wherein motor is by being symmetrically mounted on two motor supports of motor lower end It is mounted in stull, stull lower end two sides are symmetrically installed there are two side stay, and each side stay lower end is mounted on draw runner rail, draw runner rail It is mounted on conducting bar on inner face, draw runner is installed between two conducting bars, is provided with slot among draw runner, the guide groove at draw runner both ends and leads Item cooperates；Symmetrically there are three adjustment disks to support for installation on the downside of stull, and adjustment disk is mounted on adjustment disk support downside, adjusts It is provided with inner circle top surface and transition face in disc side, the circular hole of coaxial line is provided among stull and adjustment disk；Axle position is covered to turn in motor On the outside of axis, set axial cone tooth, driving gear and turntable are sequentially arranged on set axis periphery, and set axis passes through adjustment disk and adjustment disk Between driving gear and turntable；Output shaft support is mounted on the upside of stull, and output shaft is mounted in output shaft support, output The axis other end is equipped with output axial cone tooth, set axial cone tooth and output axial cone tooth cooperation；First rotating shaft and the second shaft are installed in In stull, intermediate gear is mounted on the second shaft lower end periphery, and amplification gear is mounted on the periphery of first rotating shaft lower end, Accelerating gear is mounted on first rotating shaft periphery, and is located at amplification gear lower end, drives gear and intermediate gear engagement, amplification Gear and intermediate gear engagement；One pendulum item, a slide bar, a slide bar fixed structure, a top spring and a jacking block group At one group, 10 groups circumferentially uniform to be mounted on disk edge；10 groups of mounting means and structure is identical, in 10 groups Any one group, pendulum item is mounted on the upside of turntable by straight pin, and slide bar fixed structure is mounted on the upside of turntable, and slide bar passes through slide bar Limited centering block is installed in fixed structure, slide bar one end, and the slide bar other end is equipped with jacking block, jacking block and the cooperation of adjustment disk periphery；Top Spring is nested on slide bar periphery and between jacking block and slide bar fixed structure；Swing arm one end is mounted under machine shaft End, the other end are provided with circular hole, and draw runner pin is mounted in circular hole, and latch is mounted on the upside of draw runner pin；Swing arm is located on the downside of turntable, and On the upside of draw runner, latch and pendulum item cooperation, draw runner pin are slided in the slot of draw runner；Input shaft support is mounted on the downside of draw runner, Input shaft is mounted in input shaft support upper end circular hole, and input axial cone tooth is mounted on input shaft；Mowing axle sleeve fixed structure peace On the downside of draw runner, mowing axle sleeve is mounted on mowing axle sleeve fixed structure, and mowing shaft is mounted in mowing axle sleeve, is mowed and is turned Axial cone tooth is mounted on mowing shaft periphery, and mowing shaft cone tooth and input axial cone tooth engagement, the installation of mowing shaft lower end There is serrated knife；Plate spring fixing structure is mounted on the upside of turntable, and leaf spring one end is mounted in plate spring fixing structure, and the other end is mounted on It puts on item；

Leaf spring allows pendulum item to be always maintained at radial direction pendulum row replacement restoring force under no external force；

Before jacking block enters adjustment disk periphery via transition face from inner circle top surface, latch is moved at accelerating gear, is accelerated Gear is driven.

2. the grass trimmer with sawtooth that a kind of municipal gardens according to claim 1 use, it is characterised in that: above-mentioned top bullet Spring is a contraction spring.