CN106900269A

CN106900269A - Grass-mowing machine

Info

Publication number: CN106900269A
Application number: CN201611086408.0A
Authority: CN
Inventors: 查霞红; 赵凤丽
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2015-12-23
Filing date: 2016-11-30
Publication date: 2017-06-30
Also published as: CN106900267A; CN106900268A

Abstract

The invention discloses a kind of grass-mowing machine, including：Extension rod, Handleset, work head, motor and cutting element, and motor drives cutting element rotation so as to be operated.Cutting element has the cutting edge that metal material is constituted, and preferred cutting element is hard blade.Due to substituting conventional line of beating the grass using hard blade so that the energy consumption reduction of grass-mowing machine, and need not again carry out thread-changing operation.Meanwhile, cutting element rotation produced by kinetic energy or speed be limited in it is a range of, improve using with metal material constitute cutting edge grass-mowing machine work security performance.

Description

Grass-mowing machine

Technical field

The present invention relates to garden instrument, more particularly to a kind of grass-mowing machine.

Background technology

Grass-mowing machine is just favored as a kind of garden instrument for arranging turf by more and more users.Grass-mowing machine is general It is allowed to beat the grass by driving line of beating the grass to rotate, generally includes the extension rod of lengthwise extension, the moving head located at extension rod one end, sets In the handle on extension rod and with moving head setting spaced apart, the motor of driving moving head rotation, for motor provides energy The battery bag in source.During work, moving head is driven in rotation drive and beats the grass line locking rotation so as to beat the grass.Specific mode of operation, User by handle it is hand-held grass-mowing machine beat the grass work or deburring works.

The line of beating the grass of grass-mowing machine is generally made up of nylon or plastic material, is rotated by the high speed of line of beating the grass and is realized beating grass It is disconnected.The rotary speed of grass-mowing machine generally must all be more than 6000r/min (being about as much as 90m/s), typically in order to obtain preferably Cutting effect, its rotary speed all (is about as much as 150m/ in 7000r/min (being about as much as 110m/s) to 9000r/min S) between.Too high rotary speed certainly will bring too high power consumption, it is necessary to energy consumption it is more.If being supplied using dc source Electricity, the single battery Bao Suoneng lasting working time is just shorter.One rated voltage is the direct-current lawn mower of 20V, using battery Capacity is the lithium battery pack of 2.0Ah, and in normal operating conditions, battery bag can only continuous firing 10min~20min.Work as user Carry out when large area is beaten the grass, it is necessary to repeatedly be charged to battery bag or change multiple battery bags.

Grass-mowing machine is rotated by the high speed of line of beating the grass to be realized interrupting grass, therefore, line of beating the grass can be with the increasing of working time Plus and constantly wear and tear.What the line length of the line of beating the grass entrained by each grass-mowing machine was limited by, so grass-mowing machine works one section After time, user needs to be supplemented with new line of beating the grass.Thread-changing operation increased the workload of user, and reducing user makes With the experience sense of the product, also increase the cost needed for user is beaten the grass.

The content of the invention

In view of this, the purpose of the present invention is first consisted in and provides a kind of without thread-changing operation, grass-mowing machine low in energy consumption.

The present invention provide technical scheme be：A kind of hand-held Ropeless electric grass-mowing machine, including：The extension that lengthwise extends Bar；The Handleset of extension rod one end is arranged on, is gripped for user；It is arranged on the work head of the extension rod other end, the work Making head includes cutting element；It is arranged on the work head, for the shield of cutting element described in shield portions；Cut described in driving Cut the motor that element rotates；Wherein, the cutting element is a hard blade for monoblock type.

Preferably, the hard blade is metal blade, ceramic tip or plastic blade.

Preferably, the kinetic energy scope of the cutting element rotation is less than or equal to 100J.

Preferably, the kinetic energy scope of the cutting element rotation is 30J to 50J.

Preferably, when the hard blade is metal blade, the scope of the Rockwell hardness of the metal blade blade is 30HRC to 50HRC.

Preferably, the hard blade has a plurality of cutting edges.

Compared with prior art, beneficial effects of the present invention are：The present invention is beaten the cutting element of grass-mowing machine by conventional Careless line changes hard blade, so as to reduce required energy of beating the grass, is such that it is able to extend single battery Bao Suoneng work Time, reduce user and charge in the course of the work or change the frequency of battery bag.

Present invention hard blade substitutes line of beating the grass, so as to avoid the operation that user changes line of beating the grass；And hard blade It is more resistant, so as to during grass-mowing machine use, user need not again be replaced as frequently as cutting element, so as to reduce user Use cost.

The line that will beat the grass changes hard blade into, specifically, is replaced using the blade of the cutting edge being made up of metal material and beaten the grass Line.For same diameter, the careless or careless class vegetation of type, the energy consumption required for blade cut-out is definitely less than and interrupts institute with line of beating the grass The energy consumption for needing.Specifically, same diameter, type careless or careless class vegetation is pruned, the rotary speed needed for blade is definitely less than The rotary speed beaten the grass needed for line.That is, the careless or careless class vegetation of same diameter is pruned, the kinetic energy needed for blade is definitely less than and beats the grass Kinetic energy needed for line.

But, by the intrinsic mode of operation of grass-mowing machine, the line that will beat the grass can produce many safety after changing hard blade into Problem.

When grass-mowing machine carries out normal work, operator is needed to hold the Handleset of grass-mowing machine, and the fuselage of grass-mowing machine is hanged Grass-mowing machine is manually moved and beaten the grass or deburring work by sky in working surface above working surface or its.Therefore, grasp Author directly operates grass-mowing machine to be operated, and operator is quite near with the distance between grass-mowing machine.

Because grass-mowing machine needs the direction moved according to operator to be operated, so the shield of grass-mowing machine can not be to beating the grass Line carries out 360 degree of full protection.The shield of grass-mowing machine has to reserve an opening towards operative orientation, to cause grass or grass The class vegetation line that is easy to be beaten the grass is contacted.

In the operative scenario of grass-mowing machine work, can there is the situation of the hard thing such as rubble or cement flower bed.Once use blade Conventional line of beating the grass is replaced, the hard thing such as rubble or cement flower bed can be touched in blade rotary course.Because blade is also one Kind hard thing, it is very stiff and demanding so that rubble splash or blade breakages and splash.Therefore, rubble or the blade of fracture have very much The body part (such as eyes, head, pin, hand) for carrying out and touching operator may be sputtered from the opening of shield, it is right Operator causes personal injury.

The purpose of the present invention also provides a kind of grass-mowing machine not only low in energy consumption and safe, prevents rubble or fracture blade Sputter the situation for carrying out and injuring operator.

The present invention provide technical scheme be：A kind of hand-held Ropeless electric grass-mowing machine, including：The extension that lengthwise extends Bar；The Handleset of extension rod one end is arranged on, is gripped for user；It is arranged on the work head of the extension rod other end, the work Making head includes cutting element；It is arranged on the work head, for the shield of cutting element described in shield portions；Cut described in driving Cut the motor that element rotates；Wherein, the cutting element includes the cutting edge being made up of metal material, the cutting unit The kinetic energy scope of part rotation is less than or equal to 100J.

Preferably, the scope of the cutting element rotary rpm is less than or equal to 5000r/min.

Preferably, the scope of the cutting element rotary rpm is 2000r/min to 4000r/min.

Preferably, the scope of the outer rim linear velocity of the cutting element is less than or equal to 80m/s.

Preferably, the scope of the outer rim linear velocity of the cutting element is 50m/s to 60m/s.

Preferably, the scope of the cutting edge Rockwell hardness of the cutting element is 30HRC to 50HRC.

Preferably, the cutting element is monoblock type hard blade.

Preferably, the cutting element is monoblock type metal blade.

Preferably, the quantity of the cutting element is for 1 and with a plurality of cutting edges.

Compared with prior art, the present invention is by using the cutting element that cutting edge is made up of metal material, reducing and beating Energy consumption needed for careless machine cutting grass, is limited within a predetermined range by the kinetic energy for rotating cutting element, so as to ensure there is gold Belong to the cutting element of cutting edge, in the course of the work, rubble will not be produced to splash due to being collided with hard thing or be broken what is splashed Situation, so as to ensure that the safety of operator, improves the security performance of grass-mowing machine.

The present invention also provides a kind of technical scheme is：A kind of hand-held Ropeless electric grass-mowing machine, including：What lengthwise extended prolongs Boom；The Handleset of extension rod one end is arranged on, is gripped for user；The work head of the extension rod other end is arranged on, it is described Work head includes cutting element；It is arranged on the work head, for the shield of cutting element described in shield portions；Drive described The motor that cutting element rotates；Wherein, the kinetic energy scope of the cutting element rotation is less than or equal to 100J.

Preferably, the cutting element includes the cutting edge being made up of metal material.

Preferably, the scope of the Rockwell hardness of the cutting edge is 30HRC to 50HRC.

Preferably, the cutting element is 1 hard blade of monoblock type.

Compared with prior art, in the course of the work, its energy for rotating and producing is limitation to cutting element of the invention Within a predetermined range.The technological means ensure that cutting element in the course of the work, will not be because of by external force (barrier) And be broken, splash, so as to ensure that the safety of operator, improve the security performance of grass-mowing machine.

The present invention also provides a kind of technical scheme：A kind of hand-held Ropeless electric grass-mowing machine, including：The extension that lengthwise extends Bar；The Handleset of extension rod one end is arranged on, is gripped for user；It is arranged on the work head of the extension rod other end, the work Making head includes cutting element；It is arranged on the work head, for the shield of cutting element described in shield portions；Cut described in driving Cut the motor that element rotates；Wherein, the cutting element includes the cutting edge being made up of metal material, the cutting unit The scope of part rotary rpm is less than or equal to 5000r/min.

Preferably, the cutting element is monoblock type hard blade.

Compared with prior art, the present invention is by using the cutting element that cutting edge is made up of metal material, reducing and beating Energy consumption needed for careless machine cutting grass, limits within a predetermined range, so as to ensure with metal by by cutting element rotary rpm The cutting element of cutting edge, will not produce the situation that rubble is splashed or fracture is splashed, so as to ensure that due to being collided with hard thing The safety of operator, improves the security performance of grass-mowing machine.

The present invention also provides a kind of technical scheme：A kind of hand-held Ropeless electric grass-mowing machine, including：The extension that lengthwise extends Bar；The Handleset of extension rod one end is arranged on, is gripped for user；It is arranged on the work head of the extension rod other end, the work Making head includes cutting element；It is arranged on the work head, for the shield of cutting element described in shield portions；Cut described in driving Cut the motor that element rotates；Wherein, the cutting element includes the cutting edge being made up of metal material, the cutting unit The scope of the outer rim linear velocity of part is less than or equal to 80m/s.

Preferably, the cutting element is monoblock type hard blade.

Compared with prior art, the present invention is by using the cutting element that cutting edge is made up of metal material, reducing and beating Energy consumption needed for careless machine cutting grass, is limited in preset range by by cutting element outer rim linear velocity, so as to ensure there is gold Belong to the cutting element of cutting edge, the situation that rubble is splashed or fracture is splashed will not be produced due to being collided with hard thing, so as to ensure The safety of operator, improves the security performance of grass-mowing machine.

Compared with prior art, beneficial effects of the present invention are：The present invention is beaten the cutting element of grass-mowing machine by conventional Careless line is changed into a hard blade, reduces required energy of beating the grass, such that it is able to extend single battery Bao Suoneng work Time.

The kinetic energy of the speed or rotation by limiting cutting element rotation of the invention, so as to ensure that cutting element is being touched When contacting hard thing (barrier), rubble will not be produced to splash, cutting element is broken situation about splashing, it is ensured that the peace of operator Entirely, so as to improve the security performance of grass-mowing machine.

Brief description of the drawings

The purpose of invention described above, technical scheme and beneficial effect can realize this hair by following The detailed description of bright specific embodiment.

Identical label and symbol in accompanying drawing and specification are used to represent identical or equivalent element.

Fig. 1 is the stereogram of the positive apparent direction of the grass-mowing machine in mode of operation of beating the grass of the first embodiment of the present invention.

Fig. 2 is the stereogram of looking up direction of the grass-mowing machine in mode of operation of beating the grass in Fig. 1.

Fig. 3 is the stereogram of positive apparent direction of the grass-mowing machine in deburring mode of operation in Fig. 1.

Fig. 4 is the stereogram of rear apparent direction of the grass-mowing machine in deburring mode of operation in Fig. 1.

Fig. 5 is the explosive view of the work head of the grass-mowing machine in Fig. 1.

Fig. 6 is the sectional view of the work head of the grass-mowing machine in Fig. 1.

Fig. 7 is the front view of the cutting element of the grass-mowing machine in Fig. 1.

Fig. 8 is that the first shield arc angle of the grass-mowing machine in Fig. 1 determines schematic diagram.

Fig. 9 is the stereogram of the positive apparent direction of the grass-mowing machine in mode of operation of beating the grass of the second embodiment of the present invention.

100th, grass-mowing machine 10, extension rod 12, Handleset

14th, starting switch 16, battery bag 11, extension rod rotating shaft

20th, work first 22, casing 26, motor

27th, the shield 50, cutting element of the first shield 28. second

501st, cutting edge 503, axis hole 506, fixing hole

25th, transmission mechanism 2501, transmission mechanism upper half shell 2502, travelling gear

2503rd, transmission mechanism lower half shell 40, output shaft 2201, casing left shell half

2202nd, casing right half-shell 261, motor base 401, axle sleeve

60th, fastener S, working face X, first axle

Y, second axis O, incising circular R1, cutting radius of circle

R2, shield radical length α, shield arc angle α 1, enter angle

α 2, go out angle

Specific embodiment

Refer to Fig. 1 and Fig. 2, the grass-mowing machine 100 of the present embodiment includes the extension rod 10 that lengthwise extends, located at extension rod 10 The work first 20 of one end, located at the Handleset 12 of the other end of extension rod 10.Work first 20 includes casing 22, is arranged at casing 22 Interior motor 26, the cutting element 50 that first axle X rotations are driven around by motor 26.

The first shield 27 is additionally provided with work first 20, the relative extension rod 10 of the first shield 27 is fixedly installed.First shield 27 With predetermined arc angle, for blocking the cutting element 50 in its arc angle coverage.The relative work of first shield 27 is first 20 In the direction of its Handleset 12.Specifically, as shown in figure 1, the first shield 27 includes the extension with certain arc angle, The extension extends with respect to extension rod 10 towards the direction of Handleset 12.It is corresponding that the extension of the first shield 27 covers its Cutting element 50 and its corresponding operation interval under arc angle, so as to improve security of operator when using grass-mowing machine 100. Also the annexes (not shown) such as roller, shield flower steel wire can be provided with work first 20.Control motor 26 is provided with Handleset 12 The starting switch 14 of opening and closing.

In the present embodiment, extension rod 10 is provided with power supply, specially dc source, direct current away from one end of work first 20 Power supply uses battery bag 16, preferably lithium battery pack.Thus, dc source and work first 20 is divided into the two of extension rod 10 End, and Handleset 12 is arranged on the position of relatively close power supply on extension rod 10, so that the whole center of gravity of grass-mowing machine 100 layout is closed Reason, operator is lifted by Handleset 12 can be more laborsaving when grass-mowing machine 100 works.

Fig. 1 is referred to, in the present embodiment, Handleset 12 includes the main handle and nondominant hand of setting spaced apart Handle, starting switch 14 is arranged on main handle.It is arranged such, operator can carry by the way that main handle and assist handle are more reliable Rise and control grass-mowing machine 100 to work.The grip part of main handle and assist handle refers to the part that operator holds with a hand on handle. Starting switch 14 is located or positioned at thereon adjacent to the grip part of handle.

The grass-mowing machine 100 of the present embodiment has beat the grass mode of operation and deburring mode of operation.

As depicted in figs. 1 and 2, grass-mowing machine 100 is in mode of operation of beating the grass, and cutting element 50 rotates formed cutting puts down With working surface S substantially into level, cutting element 50 rotates and for grass to be cut to predetermined height in face.Grass-mowing machine 100 is in work of beating the grass Under operation mode, extension rod 10 and foregoing cutting planes are at an angle of arrangement, and the angle is preferably greater than 30 degree, and being adapted to user will beat Careless machine 100 is placed in its cutting planes state parallel with ground to carry out work of beating the grass.

As shown in Figure 3 and Figure 4, grass-mowing machine 100 is in deburring mode of operation, and cutting element 50 rotates formed cutting puts down , substantially into vertical, be cut to grass in predetermined vertical plane by cutting element 50, or cutting element 50 is in work for face and working surface S Make to cut out predetermined groove on the S of surface.Grass-mowing machine 100 is under deburring mode of operation, and extension rod 10 and cutting planes are substantially parallel Arrangement, the angle of formation is not more than 5 degree, is adapted to that grass-mowing machine 100 is placed in its cutting planes by user and working surface is vertical State carries out deburring work.

As shown in Figure 5 and Figure 6, work first 20 includes casing 22, the motor 26 being arranged in casing 22, is driven by motor 26 Around the first shield 27 that the cutting element 50 and casing 22 of first axle X rotations are connected.

As shown in Figure 5 and Figure 6, casing 22 includes casing left shell half 2201 and casing right half-shell 2202.Casing left shell half 2201 and casing right half-shell 2202 constitute a receiving space, motor 26 is fixed in the receiving space by motor base 261. In the present embodiment, the output shaft of motor 26 coordinates with a transmission mechanism 25.Transmission mechanism 25 is by the output speed of motor 26 by biography Dynamic ratio is transferred to output shaft 40.Output shaft 40 is in order through the cooperation of transmission mechanism 25, axle sleeve 401 and cutting element 50 Hole.Cutting element 50 is mutually fixed by locking member 60 with axle sleeve 401.After motor 26 starts, motor rotates around second axis Y.Pass The rotating speed of motor output shaft is transferred to output shaft 40 by motivation structure 25 in proportion, and output shaft 40 drives axle sleeve 401 to rotate, axle sleeve 401 drive cutting element 50 to be rotated around first axle X.

In the present embodiment, rotation axis (the i.e. first axle of motor axis of rotation line (i.e. second axis Y) and cutting element 50 Line X) it is not coaxial.Transmission mechanism passes to cutting element 50 after motor speed output is carried out into reduction of speed.By after transmission mechanism 25, Cutting element 50 is cut with the output speed of motor 26 into the default secure threshold rotating speed of gearratio.Such as art technology Known to personnel, transmission mechanism can be passed using conventional gear drive, the dynamic transmission mechanism of chain, Worm and worm-wheel gearing, band Motivation structure or cam drive.

As it is known by the man skilled in the art, the matching relationship of each element can specifically be tied according to element in the work first 20 Configuration formula is different and there is the change of adaptability.

In one embodiment, the drive cutting element 50 of motor 26 is directly around the rotation of its output shaft, i.e. first axle X and second Axis Y is coaxial.Cutting element 50 is cut with the output speed of motor.By choosing suitable motor 26, so as to control to cut Element 50 is cut to be cut with default secure threshold rotating speed.

As shown in fig. 7, in the present embodiment, cutting element 50 is 1 four star-shaped hard blade, by fixing hole 506 (only being marked at one in figure) is engaged with locking member 60 and is fixed in work first 20.Four star points of the cutting element 50 are all (only marked at one in figure) with cutting edge 501, cutting element 50 rotates around first axle X, so that multiple cutting edges carry out work Make.Cutting element 50 has axis hole 506, and first axle X passes through the axis hole 506.During work, cutting element 50 is with axis hole 506 Heart O to form a cutting circle for the center of circle rotates.Center O is the cutting center of circle of cutting circle.The radius R1 of cutting circle is just It is the radial direction maximum length of cutting element 50, the i.e. outer rim of cutting element 50 just on cutting circle.Such as people in the art Member is known, and the shape of cutting element 50 can also be other types, such as strip, star, triangle or other kinds of many Side shape etc..The shape is not construed as limiting the invention.

Cutting element 50 uses hard blade, specifically such as：Metal blade, ceramic tip or plastic blade.According to power Learn ABC to understand, the power needed for grass cut-out can be far smaller than that nylon-type is beaten the grass needed for line interrupts grass by hard blade Power.Therefore, when pruning same lawn, the energy needed for hard blade is far smaller than the energy that nylon-type is beaten the grass needed for line.It is same The time that battery bag 16 is used to persistently beat the grass can significantly be extended.

Cutting element 50 can be made hard blade by metal, ceramics or plastic or other material completely, it is also possible to only cut unit The cutting edge portion of part 50 is made up of metal, ceramics or plastic or other material.Cutting element 50 is the hard blade of monoblock type, its knife Piece center of gravity is located on the central shaft of the blade.Cutting element 50 can be fabricated by by techniques such as forging, welding, die casting.

In the present embodiment, calculate cutting element 50 and rotate produced ENERGY E_kMethod it is as described below：Wherein m represents the quality of cutting element 50, and unit is kg (thousand Gram).W represents the angular speed of cutting element 50, and unit is rad/s (Radian per second).N represents the rotating speed of cutting element 50, unit It is r/min (revolutions per minute).r_kRepresent cutting element 50 and rotate the half-distance for forming cutting radius of circle R1, i.e., Unit is m (rice).

Often there is rubble in the scene of real work, in the region of lawn or by cement/stone etc. in grass-mowing machine 100 The flower bed that material is made.When cutting element 50 is hard blade, cutting element 50 contacts rubble or flower with too fast rotary speed During altar, cutting element 50 can be produced to be broken or the thing such as rubble and the danger splashed.In the present embodiment, cutting element 50 rotates Rotary speed during cutting safely rotates threshold value less than default, so as to avoid cutting element from being broken brought danger.

In an embodiment of the present invention, rotary speed when rotary speed includes Light Condition or rotation during load condition Rotary speed.By that it is known by a person skilled in the art that set electronics speed stabilizing mechanism or mechanical speed stabilizing mechanism on grass-mowing machine, can allow sky The rotary speed of load state is identical with the rotary speed of load condition or is more or less the same.Therefore, the rotation that the present invention is limited The threshold value and energy threshold of speed are all suitable for Light Condition or load condition.

In the present embodiment, the specific scope for safely rotating threshold value can be carried out by simulating steel pipe shock-testing experiment Simulate and obtain.Details are provided below for steel pipe shock-testing：The steel pipe that a diameter of 30mm, thickness are 3mm is chosen, is placed In the cutting rounded edge of grass-mowing machine 100, it is ensured that cutting element 50 impacts to steel pipe when rotated.Grass-mowing machine 100 is with highest Rotating speed runs, constant impingement steel pipe 15 seconds.Within this 15 seconds, the cutting element 50 and its fixture of grass-mowing machine 100 be not broken Split or come off, then the rotating speed of cutting element 50 is and safely rotates threshold value in the test.

In the present embodiment, the specific scope for safely rotating threshold value can be entered by simulating small ball parabolic test experiments Row is simulated and obtained.Details are provided below for the test of small ball parabolic：Test scene is the conjunction of cocoanut tree blanket ground and 19mm Into plate.Hard board surrounds octagonal, the cutting center of circle of grass-mowing machine and the octagonal center superposition, octagonal inscribed circle diameter It is (750+ cuts circular diameter ± 50) mm.The small ball that a diameter of 6.35mm, hardness are 45HRC is chosen, distance is placed on and is beaten the grass At the 25 ± 5mm of cutting rounded edge of machine 100.When grass-mowing machine 100 is run with maximum speed, small ball is maintained at vertical curve angle The height that 30mm is not less than within 10 degree is cast, and is cast 100 small steel balls and is cast 5 times.Octagonal hard board is pressed from coconut palm The height on tree blanket ground is divided into 3 regions：0-300mm regions, 300-450mm regions and 450mm area above.Test result For：In 0-300mm regions, the number that small ball punctures hard board is no more than 30；In 300-450mm regions, small ball hits The number for wearing hard board is no more than 6；In 450mm area above, the number that small ball punctures hard board is no more than 0.When full During the foot test result, then it is assumed that the rotating speed of cutting element 50 now is and safely rotates threshold value.

When being tested using different types of hard blade, the outer rim of the cutting element 50 of simulated experiment is met Linear velocity scope is less than or equal to 80 metre per second (m/s)s (m/s).Preferably, the linear velocity scope of the outer rim of cutting element 50 is 50m/s to 60m/s.Under the requirement for meeting these simulated experiments, the rotary rpm scope of cutting element 50 be less than or equal to 5000 revolutions per minute (r/min).Preferably, the rotary rpm scope of cutting element 50 is 2000r/min to 4000r/min.Meeting Under the requirement of these simulated experiments, cutting element 50 rotates produced kinetic energy scope and is less than or equal to 100 joules (J).Preferably, It is 10J to 80J that cutting element 50 rotates produced kinetic energy scope.It is furthermore preferred that cutting element 50 rotates produced kinetic energy Scope is 30J to 50J.In the experiment test, when selected cutting element is Metal Cutting sword, the Metal Cutting sword Hardness range is 30HRC to 50HRC.Preferably, the hardness range of the Metal Cutting sword is 40HRC to 45HRC.

Grass-mowing machine work process for battery bag to electric machine with energy, motor rotarily drive cutting element rotation so that Realization is beaten the grass or deburring.As it is known by the man skilled in the art, power P required during grass-mowing machine normal work is smaller, then represents and beat The power consumption of careless machine is lower, thus battery bag lasting can beat the grass time or area of beating the grass will be bigger.When the cutting of grass-mowing machine Element be substituted for by conventional rope of beating the grass Metal Cutting sword hard blade, preferably metal blade when, grass-mowing machine normal work when institute The power P for needing can significantly reduce.Operating voltage during grass-mowing machine normal work is multiplied by operating current, and to obtain the grass-mowing machine normal Required power P during work.

Table one, rope class grass-mowing machine parameter of beating the grass

Under existing different cutting diameters beat the grass rope type grass-mowing machine normal work when required power P as shown in Table 1.Cutting The size of circular diameter can need to be designed according to market.Because grass-mowing machine needs user's palm top, therefore, cutting circle is straight The span in footpath is generally 200mm to 400mm.When cutting circular diameter change and being big, the area of grass-mowing machine single cut grass is with regard to phase Strain is big, according to formula Understand cutting element Edge linear velocity or the kinetic energy as produced by rotation can also increased.

The cutting element of grass-mowing machine changes the hard blade with Metal Cutting sword, preferably steel edge into by conventional rope of beating the grass Piece, can largely reduce power required during grass-mowing machine normal work.In the present embodiment, grass-mowing machine uses steel edge The scope of the power P of piece (specially iron blade) is less than or equal to 120 watts (W).Specifically, when cutting circular diameter scope is 350mm During to 400mm, power bracket is 100W to 120W during the grass-mowing machine normal work.When the cutting circular diameter scope is During 350mm to 400mm, the range of speeds of the cutting element rotation is 3500r/min to 4500r/min.When the cutting circle When diameter range is 250mm to 350mm, required power bracket is 60W to 100W during the grass-mowing machine normal work.Cut when described When cyclotomy diameter range is 250mm to 350mm, the range of speeds of the cutting element rotation is 2000r/min to 3500r/ min。

Because the mode of operation of grass-mowing machine needs that user is portable to be operated, therefore the main screw lift of grass-mowing machine is also very heavy The parameter wanted.The present invention using power and main screw lift ratio (P/M), as weigh grass-mowing machine power consumption and operational comfort it Between parameter.Power represents power consumption needed for unit mass with the ratio of main screw lift, when in the smaller explanation unit mass of ratio Grass-mowing machine can persistently beat the grass, and the time is more long or area of beating the grass is bigger.In the present embodiment, using metal blade (specially iron knife Piece) as cutting element grass-mowing machine normal work when the ratio of power and grass-mowing machine main screw lift be less than or equal to 25.Pass through Table one understands that the ratio is far smaller than the ratio of rope type grass-mowing machine of beating the grass.

In one embodiment, the drive cutting element 50 of motor 26 is directly around the rotation of its output shaft, and safely rotating threshold value can be with Obtained by choosing suitable motor 26.To be cut by motor 26 of the output speed less than or equal to secure threshold need to only be chosen The rotary speed control of element is being safely rotated within threshold value.

In another embodiment, motor 26 is rotated by a transmission mechanism drive cutting element 50 around first axle X, safety Threshold rotating value can be obtained by choosing suitable transmission mechanism.By selecting the suitable transmission mechanism of gearratio, using the biography Dynamic ratio is safely rotating within threshold value the rotary speed control of cutting element 50.

The kinetic energy produced when rotating of cutting element 50 or its rotary speed are limited in a default secure threshold model In enclosing, can prevent grass-mowing machine 100 from the situation that foreign matter splashing is hurted sb.'s feelings occurring in the course of the work.Another kind prevents grass-mowing machine 100 There is foreign matter in the course of the work to splash situation about hurting sb.'s feelings, it is possible to use first shield 27 improves protective capacities, so as to reach To the security performance for improving grass-mowing machine 100.

As shown in figure 8, choosing the schematic diagram of arc angle for the first shield 27.Cutting element 50 is according to arrow as shown in Figure 8 Rotation, so as to form a cutting to cut center of circle O as the center of circle justify.The radius of cutting circle is R1, in this embodiment, half Footpath R1 is exactly the radial direction maximum length of cutting element 50.With center of circle O as the origin of coordinates, a coordinate system is set up.The coordinate system Abscissa parallel to working face S, the ordinate of the coordinate system is perpendicular to working face S.First shield 27 forms a screening The part of the gear cutting circle, the radial direction maximum length R1s of the radical length R2 more than cutting element 50 of the first shield 27.The screening The arc angle of stopper point is defined as the arc angle α of first shield of arc angle 27 of the first shield 27, and it to cut round heart O is angle that arc angle α is Summit, the side of outer most edge two that cutting circle is sheltered from the first shield 27 is the arm of angle.In this embodiment, angle BOA is The arc angle α scopes of the first shield 27.According to the direction of rotation of cutting element 50, the arc angle α of the first shield 27 enters angle [alpha] by shield 1 and shield go out angle [alpha] 2 and constitute.As known to Fig. 8, the direction of rotation of cutting element 50 is entered angle [alpha] 1 and is gone out as indicated in the figures by an arrow, then The mark of angle [alpha] 2 is as shown in the figure.

Arc angle α needs to meet certain angular range, so as to improve the overall security performance of grass-mowing machine.Arc angle α's Angular range, can be obtained by two simulation tests.First simulation test, when grass-mowing machine 100 is in deburring mode of operation When, and operator is in normal operating, the sight line of operator can't see cutting element 50.Second simulation test, works as grass-mowing machine 100 under deburring mode of operation when, the pin of operator is cannot to be passed through in the gap of working face from the first shield and contacted Arrive cutting element.Understood by simulation test, the scope of the arc angle α of the first shield is less than 270 degree more than or equal to 150 degree.More Preferably, the scope of the arc angle α of the first shield is less than or equal to 240 degree more than or equal to 150 degree.It is furthermore preferred that the arc of the first shield The scope of angle α is less than or equal to 220 degree more than or equal to 180 degree.In the embodiment shown in fig. 1, the arc angle α of selected first shield Scope is 190 degree.When arc angle α is 150 degree, it enters angle [alpha] 1 and is set to 50 degree accordingly, goes out angle [alpha] 2 and is set to 100 degree；Work as arc When angle α is 190 degree, it enters angle [alpha] 1 and is set to 90 degree accordingly, goes out angle [alpha] 2 and is set to 100 degree；When arc angle α is 220 degree, its phase The angle [alpha] 1 of entering answered is set to 105 degree, goes out angle [alpha] 2 and is set to 115 degree.As it is known by the man skilled in the art, entering angle [alpha] 1 and going out angle The specific setting of α 2, it is also possible to be not exactly equal to examples cited.The setting of the angle is only needed to disclosure satisfy that when grass-mowing machine 100 is in During deburring mode of operation, above two simulation test is met.

The arc angle scope of the first shield 27 is limited within certain predetermined angle, when can improve the work of grass-mowing machine 100 Security performance.In order to further improve the security operationally of grass-mowing machine 100, it is also possible to by choosing suitable material, When the rotary speed of cutting element is under previous security threshold value so that the anti-breakdown of the first shield 27 is good, will not fly Splash thing and puncture the situation of the first shield, so as to protect operator not injured by the splash in the course of work.

In the present embodiment, the material selected by the first shield 27 can be tested and obtained by simulating big steel ball.Big steel Details are provided below for ball test：Test scene surrounds octagonal for hard board, and ground is tiling on the hard board of 19mm The steel plate of 1.5mm.The cutting center of circle of grass-mowing machine and the octagonal center superposition, octagonal inscribed circle diameter is for (750+ cuts The mm of cyclotomy diameter ± 50).The big steel ball that a diameter of 12.75 ± 0.25mm, hardness are 45HRC is chosen, is placed on apart from grass-mowing machine At 100 25 ± 5mm of cutting rounded edge.When grass-mowing machine 100 is run with maximum speed, big steel ball is with higher than cutting planes 13- The height of 300mm is cast, and is cast for one group with 10, and 10 groups are cast altogether, often throw one group just change one cast it is high Degree position.After this 10 groups of tests, the first shield 27 occurs without the breakage that big steel ball passes through, that is, think the institute of the first shield 27 The material of selection can improve the security performance of grass-mowing machine.

Being made the first shield 27 using different materials can meet above-mentioned big steel ball test.Material selected by first shield Compressive strength scope is 50MPa to 100MPa.The fracture extension rate of material selected by the first shield ranges preferably from 30% and arrives 300%.When the compressive strength and fracture extension rate of some materials meet the scope obtained by test, the anti-breakdown of the material is just Meet the first shield of making.Specifically, the material of the first shield can select ABS plastic, PPS plastics or ferrous metal material Material etc..In the embodiment shown in fig. 1, the first shield 27 is made up of polypropylene material.

In this embodiment, instead of the line of beating the grass of nylon material, preferably metal blade generation is used by using hard blade For the line of beating the grass of nylon material, the required energy that cuts the grass on a lawn is reduced, significantly extend battery pack in holding for beating the grass The continuous time, it is effectively improved Consumer's Experience sense.A safety rotation is limited to by by the rotary speed or kinetic energy of cutting element Turn within threshold value, it is to avoid cutting element fracture is splashed or the danger hurted sb.'s feelings of splashing such as rubble, is effectively improved grass-mowing machine General safety performance.

As shown in figure 9, the grass-mowing machine of the second embodiment of the present invention is in the solid of the positive apparent direction of mode of operation of beating the grass Figure.In this embodiment, work first 20 also includes the second shield 28 being arranged on housing 22.Second shield 28 and the first shield 27 relative housings 22 are fixedly installed.The mounting plane of the second shield 28 is identical with the mounting plane of the first shield 27, the second shield 28 opposite faces for being set in parallel in the first shield 27.The arc angle of the second shield 28 is 360 degree with the arc angle sum of the first shield 27, Second shield 28 is used to block the part that the first shield 27 does not block cutting element 50.The radial direction maximum length of the second shield 28 Less than the radial direction maximum length of cutting element 50, for cutting edge to be exposed into the second shield, so that cutting edge is easily cut to grass Cut.Second shield 28 further increasing the security performance of grass-mowing machine 100 so that cutting element 50 is difficult surprisingly to be contacted Arrive, and so that the position that chip produced in the course of work is difficult not blocked from the first shield 27 sputters.

The present invention is not limited to lifted specific embodiment structure, and the structure based on present inventive concept belongs to guarantor of the present invention Shield scope.

Claims

1. a kind of hand-held Ropeless electric grass-mowing machine, including：

The extension rod that lengthwise extends；

The Handleset of extension rod one end is arranged on, is gripped for user；

The work head of the extension rod other end is arranged on, the work head includes cutting element；

The shield on the work head is arranged on, for cutting element described in shield portions；

The motor for driving the cutting element to rotate；

Characterized in that, the cutting element includes the cutting edge being made up of metal material, the kinetic energy of the cutting element rotation Scope is less than or equal to 100J.

2. hand-held Ropeless electric grass-mowing machine according to claim 1, it is characterised in that the cutting element rotation it is dynamic Energy range is 30J to 50J.

3. hand-held Ropeless electric grass-mowing machine according to claim 1, it is characterised in that the cutting element rotary rpm Scope be less than or equal to 5000r/min.

4. hand-held Ropeless electric grass-mowing machine according to claim 1, it is characterised in that the cutting element rotary rpm Scope be 2000r/min to 4000r/min.

5. hand-held Ropeless electric grass-mowing machine according to claim 1, it is characterised in that the border line of the cutting element The scope of speed is less than or equal to 80m/s.

6. hand-held Ropeless electric grass-mowing machine according to claim 1, it is characterised in that the border line of the cutting element The scope of speed is 50m/s to 60m/s.

7. hand-held Ropeless electric grass-mowing machine according to claim 1, it is characterised in that the cutting edge of the cutting element The scope of Rockwell hardness is 30HRC to 50HRC.

8. hand-held Ropeless electric grass-mowing machine according to claim 1, it is characterised in that the cutting element is monoblock type Hard blade.

9. hand-held Ropeless electric grass-mowing machine according to claim 1, it is characterised in that the cutting element is monoblock type Metal blade.

10. hand-held Ropeless electric grass-mowing machine according to claim 8 or claim 9, it is characterised in that the number of the cutting element Measure for 1 and with a plurality of cutting edges.

A kind of 11. hand-held Ropeless electric grass-mowing machines, including：

The extension rod that lengthwise extends；

The Handleset of extension rod one end is arranged on, is gripped for user；

It is arranged on the work head, for the shield of cutting element described in shield portions；

The motor for driving the cutting element to rotate；

Characterized in that, the kinetic energy scope of the cutting element rotation is less than or equal to 100J.

12. hand-held Ropeless electric grass-mowing machines according to claim 11, it is characterised in that the cutting element rotation Kinetic energy scope is 30J to 50J.

13. hand-held Ropeless electric grass-mowing machines according to claim 11, it is characterised in that the cutting element include by The cutting edge that metal material is constituted.

14. hand-held Ropeless electric grass-mowing machines according to claim 13, it is characterised in that the Rockwell of the cutting edge is hard The scope of degree is 30HRC to 50HRC.

15. hand-held Ropeless electric grass-mowing machines according to claim 11, it is characterised in that the cutting element is 1 The hard blade of monoblock type.

A kind of 16. hand-held Ropeless electric grass-mowing machines, including：

The extension rod that lengthwise extends；

The Handleset of extension rod one end is arranged on, is gripped for user；

The motor for driving the cutting element to rotate；

Characterized in that, the cutting element includes the cutting edge being made up of metal material, the cutting element rotary rpm Scope is less than or equal to 5000r/min.

17. hand-held Ropeless electric grass-mowing machines according to claim 16, it is characterised in that the cutting element rotation turns The scope of speed is 2000r/min to 4000r/min.

18. hand-held Ropeless electric grass-mowing machines according to claim 16, it is characterised in that the cutting element is overall Formula hard blade.

A kind of 19. hand-held Ropeless electric grass-mowing machines, including：

The extension rod that lengthwise extends；

The Handleset of extension rod one end is arranged on, is gripped for user；

The motor for driving the cutting element to rotate；

Characterized in that, the cutting element includes the cutting edge being made up of metal material, the outer rim linear speed of the cutting element The scope of degree is less than or equal to 80m/s.

20. hand-held Ropeless electric grass-mowing machines according to claim 19, it is characterised in that the outer rim of the cutting element The scope of linear velocity is 50m/s to 60m/s.

21. hand-held Ropeless electric grass-mowing machines according to claim 19, it is characterised in that the cutting element is overall Formula hard blade.

A kind of 22. hand-held Ropeless electric grass-mowing machines, including：

The extension rod that lengthwise extends；

The Handleset of extension rod one end is arranged on, is gripped for user；

The motor for driving the cutting element to rotate；

Characterized in that, the cutting element is a hard blade for monoblock type.

23. hand-held Ropeless electric grass-mowing machines according to claim 22, it is characterised in that the hard blade is metal Blade, ceramic tip or plastic blade.

24. hand-held Ropeless electric grass-mowing machines according to claim 22, it is characterised in that the cutting element rotation Kinetic energy scope is less than or equal to 100J.

25. hand-held Ropeless electric grass-mowing machines according to claim 22, it is characterised in that the cutting element rotation Kinetic energy scope is 30J to 50J.

26. hand-held Ropeless electric grass-mowing machines according to claim 22, it is characterised in that the hard blade has multiple Several cutting edges.

27. hand-held Ropeless electric grass-mowing machines according to claim 23, it is characterised in that the hard blade is metal During blade, the scope of the Rockwell hardness of the metal blade blade is 30HRC to 50HRC.