CN107061407B - The hydraulic control method of grass trimmer and its grass-cutting head - Google Patents
The hydraulic control method of grass trimmer and its grass-cutting head Download PDFInfo
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- CN107061407B CN107061407B CN201710078804.7A CN201710078804A CN107061407B CN 107061407 B CN107061407 B CN 107061407B CN 201710078804 A CN201710078804 A CN 201710078804A CN 107061407 B CN107061407 B CN 107061407B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/64—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The present invention relates to a kind of dual-head conjoined asynchronous hydraulic cylinder, the hydraulic control method of grass-cutting head, rotating mechanism and grass trimmers.The control method includes: the left side hydraulic fluid port oil inlet to the dual-head conjoined asynchronous hydraulic cylinder, so that the piston rod in the dual-head conjoined asynchronous hydraulic cylinder left chamber stretches out, by the small chamber communication port of the dual-head conjoined asynchronous hydraulic cylinder left chamber and right chamber the piston rod in the dual-head conjoined asynchronous hydraulic cylinder right chamber is retracted simultaneously, the hydraulic fluid port oil return of the right chamber, so that the grass-cutting head rotates clockwise.Technical solution of the present invention, moving horizontally for oil cylinder easily can be changed into the rotary motion of grass-cutting head, the hydraulic control of different oil circuits, locking, the floating in ground any position of grass-cutting head any position can be achieved, the impact from grass-cutting head or working arm can be buffered, it can auto-tensioning rotary-chain.
Description
Technical field
Present invention relates generally to grass trimmer fields, and in particular to a kind of dual-head conjoined asynchronous hydraulic cylinder, grass-cutting head it is hydraulic
Control method.
Background technique
It is well known that substantially manually being cut using a kind of the hand-held of small shape on the lawn or branch in highway both sides or park
The small mower or manual, electric tool of careless machine or hand push, working efficiency is low, labor intensive is more, mowing height is not easy to adjust
It saves and the problems such as there are personal safeties, and the branch in higher place, such as roadside, be inconvenient to cut with existing equipment
Fall.
And in grass trimmer work, because operating condition needs to usually require to lock grass trimmer can with any position, it can make to cut
Toothed burclover has float function in ground location, can buffer the impact etc. from ground or working arm, to buffer external impacts, protects
Protect equipment safety.
Therefore, in order to adapt to the demands of different operating conditions, lawn on both sides of the road, greenbelt, isolation strip, tiltedly are such as applicable to
The career fields such as slope or branch, the occasion having higher requirements to angle, locking, buffering etc., it is necessary to propose a kind of new mowing
Machine technology while stating function in realization, can simplify structure, reduce cost, so that grass trimmer is convenient for operation and uses.
Summary of the invention
The purpose of the present invention is to provide a kind of dual-head conjoined asynchronous hydraulic cylinders, the hydraulic control method of grass-cutting head, with solution
The problem that certainly existing grass trimmer does not adapt to the demand of various complex working conditions and structure is complicated, at high cost.
The present invention is intended to provide a kind of dual-head conjoined asynchronous hydraulic cylinder, the cylinder chamber be divided into cavity it is equal in magnitude and
Parallel arrangement of left chamber and right chamber, wherein the left chamber and right chamber are respectively equipped with the identical piston of size and piston rod, the left side
Chamber and right chamber are respectively divided by intracavitary piston and piston rod positioned at the small chamber of piston rod front end and positioned at the big of piston rod rear end
Chamber；Communication port is equipped in the front end for being located at the small chamber between the small chamber of the left chamber and the small chamber of right chamber；The left chamber and the right side
The end of each arrogant chamber of chamber is equipped with hydraulic fluid port, is used for oil inlet or oil return；The end of the small chamber of the small chamber or right chamber of the left chamber is equipped with
Repairing mouth.
The present invention also provides a kind of hydraulic control method with dual-head conjoined asynchronous hydraulic cylinder grass-cutting head, the controlling parties
Method includes:
Left side hydraulic fluid port oil inlet to the dual-head conjoined asynchronous hydraulic cylinder, so that the dual-head conjoined asynchronous hydraulic cylinder left chamber
Interior piston rod stretches out, while making described pair by the small chamber communication port of the dual-head conjoined asynchronous hydraulic cylinder left chamber and right chamber
Piston rod in conjuncted asynchronous hydraulic cylinder right chamber retracts, the hydraulic fluid port oil return of the right chamber, so that the grass-cutting head turns clockwise
It is dynamic；
Right side hydraulic fluid port oil inlet to the dual-head conjoined asynchronous hydraulic cylinder, so that the dual-head conjoined asynchronous hydraulic cylinder right chamber
Interior piston rod stretches out, while making described pair by the small chamber communication port of the dual-head conjoined asynchronous hydraulic cylinder right chamber and left chamber
Piston rod in conjuncted asynchronous hydraulic cylinder left chamber retracts, the hydraulic fluid port oil return of the left chamber, so that the grass-cutting head turns counterclockwise
It is dynamic；
The left chamber of the dual-head conjoined asynchronous hydraulic cylinder is connected to way to cycle oil with the hydraulic fluid port of right chamber, makes grass-cutting head certainly
It is rotated under body gravity, the dual-head conjoined asynchronous hydraulic cylinder piston rod can be according to left and right chamber after grass-cutting head and ground face contact
The size of stress and move, so that the grass-cutting head be driven to rotate clockwise or rotate counterclockwise so that the grass-cutting head floats,
To adapt to the different slope angle in ground.
Above-mentioned hydraulic control method, the method also includes:
When the shortage of oil of small chamber in the dual-head conjoined asynchronous hydraulic cylinder, make hydraulic oil by check valve and balanced valve into
Enter, then passes through repairing mouth and enter in the small chamber of the dual-head conjoined asynchronous hydraulic cylinder, after the small chamber is filled with, the small chamber
Pressure is greater than big cavity pressure to close the check valve, completes repairing movement.
Above-mentioned hydraulic control method, when so that the grass-cutting head rotating clockwise, by ratio valve group make hydraulic oil into
Enter, by the adjustment of the first overflow valve, the pressure of setting hydraulic circuit, so that when being higher than the pressure of setting, first overflow
Valve pressure release；Hydraulic oil two-way later enters from the check valve side of the first balanced valve all the way, and another way is that a guide's oil circuit is used
In the access for opening the second balanced valve, it to be used for oil return；Hydraulic oil enters the dual-head conjoined asynchronous liquid from the hydraulic fluid port of the left chamber
The big chamber of cylinder pressure left chamber, meanwhile, hydraulic fluid port stream of the right chamber low-pressure hydraulic oil from the right chamber in the dual-head conjoined asynchronous hydraulic cylinder
Out, oil return line is returned to by second balanced valve.
Above-mentioned hydraulic control method, when so that the grass-cutting head rotating counterclockwise, by ratio valve group make hydraulic oil into
Enter, by the adjustment of the second overflow valve, the pressure of setting hydraulic circuit, so that when being higher than the pressure of setting, second overflow
Valve pressure release；Hydraulic oil two-way later enters from the check valve side of the second balanced valve all the way, and another way is that a guide's oil circuit is used
In the access for opening the first balanced valve, it to be used for oil return；Hydraulic oil enters the dual-head conjoined asynchronous liquid from the hydraulic fluid port of the right chamber
The big chamber of cylinder pressure right chamber, meanwhile, hydraulic fluid port stream of the left chamber low-pressure hydraulic oil from the left chamber in the dual-head conjoined asynchronous hydraulic cylinder
Out, oil return line is returned to by first balanced valve.
Above-mentioned hydraulic control method when so that the grass-cutting head floating, makes to control at the ratio valve group that hydraulic oil enters
Yu Zhongwei, one group of 2/2-way valve are respectively turned on two-way and connection oil circuit, make the big of the dual-head conjoined asynchronous hydraulic cylinder left chamber
The oil return line of the big chamber hydraulic circuit hydraulic fluid port and the ratio valve group of chamber hydraulic circuit hydraulic fluid port and the right chamber is connected to.
The overhang of above-mentioned hydraulic control method, the dual-head conjoined asynchronous hydraulic cylinder left chamber piston rod joins equal to double end
The retraction amount of the retraction amount of the asynchronous hydraulic cylinder right chamber piston rod of body, dual-head conjoined asynchronous hydraulic cylinder left chamber piston rod joins equal to double end
The small intracavitary portion of the overhang of the asynchronous hydraulic cylinder right chamber piston rod of body, the left chamber and right chamber is connected, and passes through the left chamber
Or the repairing mouth of right chamber is connected with check valve；4th balanced valve and third balanced valve by hydraulic fluid port be separately connected the left chamber and
The big chamber of right chamber.
Above-mentioned hydraulic control method, when the external impacts of buffering left side, hydraulic oil is from the dual-head conjoined asynchronous hydraulic cylinder
The outflow of right chamber hydraulic fluid port work as pressure by the check valve in the third balanced valve that connect with the dual-head conjoined asynchronous hydraulic cylinder
After pressure greater than the 4th balanced valve setting being set side by side with the third balanced valve, the 4th balanced valve is opened, from institute
The left chamber hydraulic fluid port for stating dual-head conjoined asynchronous hydraulic cylinder enters in the big chamber of the dual-head conjoined asynchronous hydraulic cylinder；Buffering right side external force
When impact, hydraulic oil from the left chamber hydraulic fluid port of the dual-head conjoined asynchronous hydraulic cylinder flow out, by with the dual-head conjoined asynchronous liquid
Check valve in 4th balanced valve of cylinder pressure connection, when pressure is greater than the third balanced valve being set side by side with the 4th balanced valve
After the pressure of setting, the third balanced valve is opened, is entered from the right chamber hydraulic fluid port of the dual-head conjoined asynchronous hydraulic cylinder described double
In the big chamber of conjuncted asynchronous hydraulic cylinder.
Above-mentioned hydraulic control method, the method also includes, when left side is by larger external force or inertia force, the double end
The piston rod of conjuncted asynchronous hydraulic cylinder left chamber stretches out, and the piston rod of the right chamber is withdrawn, hydraulic fluid port stream of the hydraulic oil from the right chamber
Out, to buffer left side external impacts；When right side is by larger external force or inertia force, the dual-head conjoined asynchronous hydraulic cylinder right chamber
Piston rod stretches out, and the piston rod of the left chamber is withdrawn, and hydraulic oil is flowed out from the hydraulic fluid port of the left chamber；With the external force punching of buffering right side
It hits.
Above-mentioned hydraulic control method, the method also includes being made by ratio valve group when grass-cutting head is static not to be rotated
Hydraulic oil enters, and when the ratio valve group is in middle position, the high-pressure oil passage of the ratio valve group ends, the ratio valve group
The oil return line of guide's oil circuit cut-off, the ratio valve group is connected, and one group of overflow valve connecting with the ratio valve group is used to adjust
The pressure of hydraulic circuit, one group of overflow valve are connected in parallel；One group of 2/2-way valve connecting with one group of overflow valve is used
Stop to control the logical of oil circuit in parallel, one group of 2/2-way valve is connected in parallel；First group connect with one group of overflow valve
Hydraulic lock and hydraulic cushion are played the role of in balanced valve interconnection；One group of 2/2-way valve is in parallel with first group of balanced valve
Connection；One group of 2/2-way valve and first group of balanced valve are connect with second group of balanced valve, second group of balanced valve
It is connect with the left chamber of the dual-head conjoined asynchronous hydraulic cylinder with right chamber hydraulic fluid port.
There are two piston rods for dual-head conjoined asynchronous cylinder design of the invention, connect one group of chain by the head of each bar
Item drives rotating wheel, and the conjuncted setting of the left and right chamber of hydraulic cylinder and the connection design of small chamber and oil inlet oil return and repairing mouth
Cooperation, and then make rotating wheel that grass-cutting head be driven to can be realized the functions such as rotation, floating, locking and shock resistance, and can open automatically
Tight rotary-chain.
Rotating mechanism of the invention is able to drive grass-cutting head and flexibly rotates freely, and mechanism is simple and compact.
Grass trimmer overall structure of the invention is simple, easy to use and operate, can be lifted and be realized not by the rotation of working arm
With the operation of the gradient and height, and convenient for collapsing, the design of hydraulic cylinder and third joint arm regular hexagon so that it occupies little space,
And it is mountable on mobile device such as truck.
There are two piston rods for the dual-head conjoined asynchronous cylinder design of hydraulic control of the present invention, are connected by the head of each bar
One group of chain is connect to drive rotating wheel, and the conjuncted setting of the left and right chamber of hydraulic cylinder and the connection design of small chamber and oil inlet oil return
With the cooperation of repairing mouth, and then make rotating wheel drive grass-cutting head can be realized the functions such as rotation, floating, locking and shock resistance, and
It can auto-tensioning rotary-chain.
Hydraulic control method of the invention the rotating mechanism of grass-cutting head be able to drive grass-cutting head flexibly to rotate freely.
Hydraulic control method of the invention is simple, easy to use and operate, so that grass trimmer is able to achieve multiple functions, hydraulic oil
The mutual coordinated design on road simplifies the control of system.
Detailed description of the invention
Fig. 1 a is the positive structure diagram that rotating mechanism of the present invention connects grass-cutting head；
Fig. 1 b is the schematic perspective view that rotating mechanism of the present invention connects grass-cutting head；
Fig. 1 c is the attachment structure schematic diagram of rotating mechanism of the present invention and grass-cutting head；
Fig. 2 is the hydraulic cylinder schematic cross-sectional view of the embodiment of the present invention；
Fig. 3 is grass trimmer of embodiment of the present invention mounting structure stereoscopic schematic diagram；
Fig. 4 is hydraulic principle schematic diagram when grass-cutting head of the embodiment of the present invention is static；
Fig. 5 is the hydraulic principle schematic diagram of oil inlet on the left of the embodiment of the present invention；
Fig. 6 is the hydraulic principle schematic diagram of oil inlet on the right side of the embodiment of the present invention；
Fig. 7 is hydraulic principle schematic diagram when grass-cutting head of the embodiment of the present invention floats；
Hydraulic principle schematic diagram when Fig. 8 is small chamber repairing of the embodiment of the present invention；
Hydraulic principle schematic diagram when Fig. 9 is on the left of the embodiment of the present invention by pulling force；
Hydraulic principle schematic diagram when Figure 10 is on the right side of the embodiment of the present invention by pulling force.
Specific embodiment
Below in conjunction with drawings and examples, a specific embodiment of the invention is described in more details, so as to energy
The advantages of enough more fully understanding the solution of the present invention and its various aspects.However, specific embodiments described below and reality
It applies example to be for illustrative purposes only, rather than limiting the invention.
Hydraulic control of the present invention be directed to a kind of grass trimmer, grass-cutting head connection can make its 270 degree rotate rotating mechanisms and its
Hydraulic control system.This grass trimmer is also provided with working arm and its electric-control system, is loaded in it on mobile device such as vehicle, so that
Working arm drives the movements such as grass-cutting head lifting decline under the control of electric-control system and other hydraulic systems.
Specifically, as shown in Figure 1a, rotating mechanism includes hydraulic cylinder, which is dual-head conjoined asynchronous hydraulic cylinder, should
The inner cavity of hydraulic cylinder is divided into cavity equal in magnitude and parallel arrangement of left chamber and right chamber, their front end is concordant, and rear end is also concordant.
Left chamber and right chamber are respectively equipped with the identical piston of size and piston rod 504,505.Left chamber and right chamber are respectively by intracavitary piston point
For the small chamber positioned at piston rod front end and the big chamber positioned at piston rod rear end.One group of chain 6,7 of each piston rod head connection, every group
The chain fixation is wrapped in the same rotating wheel 8, and the rotating wheel 8 drives the mowing under the driving of the hydraulic cylinder
First 4 rotary shaft rotation.
It is equipped with a communication port O2 in the front end for being located at the small chamber between left chamber and the small chamber of right chamber, for so that one
Intracavitary oil can flow to another chamber, so that two chamber coordinateds of hydraulic cylinder work asynchronously, be rotated by chain-driving
Wheel rotation to the left or to the right, or keep balance.
It is equipped with hydraulic fluid port A, B in the end of each arrogant chamber of left chamber and right chamber, is used for oil inlet or oil return.In the small of left chamber or right chamber
The end of chamber is equipped with a repairing mouth O1, and the supply of hydraulic oil is carried out when for small cavity pressure deficiency.This hydraulic fluid port is thin by one
Small oil duct cylinder interior extend to cylinder base and with valve group connection.
Lack occupied space when in order to install as far as possible, it is preferable that the shape of dual-head conjoined asynchronous hydraulic cylinder may be designed as positive six
Side shape structure.
As shown in Figure 1 b, in order to connect piston rod with chain, the head of piston rod is welded with chain fixing seat.
The mode for engaging connection can be used between connection transmission shaft and the rotary shaft of grass-cutting head of rotating mechanism.
As shown in figure 3, the side that rotating mechanism can be connected to grass-cutting head working arm by connecting transmission shaft, thus will not
Spatially interfere with grass-cutting head.
In view of the tensioning of the chain, as shown in Figure 1a, rotating mechanism may also include a pair of of regulating wheel 9,10, regulating wheel 9,10
It is symmetricly set on 6,7 outside of chain between rotating wheel 8 and the piston rod head of hydraulic cylinder, and compresses chain 6,7.
Preferably, the rotation angle of rotating wheel 8 is designed as 0-270 degree, can rotated clockwise or counterclockwise.
Grass trimmer comprising above-mentioned rotating mechanism can be installed on fixed device or mobile device by mounting rack such as balladeur train etc.
On.Certainly it is usually mounted in mobile device according to requirements of one's work, in Operation Van.
When installation, grass trimmer may also include working arm in addition to the rotating mechanism being connected on grass-cutting head, and working arm preferably wraps
The first joint arm, the second joint arm and third joint arm that three sections are mutually rotatablely connected are included, the third joint arm is the steel pipe of regular hexagon,
The third joint arm is provided with the hydraulic cylinder of the rotating mechanism.Working arm is installed on the balladeur train by first joint arm
On.
Grass trimmer further includes hydraulic control system, and hydraulic control system includes intelligent hydraulic valve group and pipeline road, is used for
Control the oil inlet, oil return or repairing of the hydraulic cylinder.
Specifically, as shown in figure 4, it is double in order to be equal to the overhang of the dual-head conjoined asynchronous hydraulic cylinder left chamber piston rod
The retraction amount of conjuncted asynchronous hydraulic cylinder right chamber piston rod, the retraction amount of dual-head conjoined asynchronous hydraulic cylinder left chamber piston rod are equal to double
The small intracavitary portion of the overhang of conjuncted asynchronous hydraulic cylinder right chamber piston rod, the left chamber and right chamber is connected, and by described
The repairing mouth of left chamber or right chamber is connected with check valve；4th balanced valve and third balanced valve are separately connected the left side by hydraulic fluid port
The big chamber of chamber and right chamber.
Enter hydraulic oil by ratio valve group, when the ratio valve group is in middle position, the high pressure of the ratio valve group
Oil circuit cut-off, the guide's oil circuit cut-off of the ratio valve group, the oil return line of the ratio valve group are connected, are connected with the ratio valve group
The one group of overflow valve connect is used to adjust the pressure of hydraulic circuit, and one group of overflow valve is connected in parallel；With one group of overflow valve
One group of 2/2-way valve of connection is used to control the logical of oil circuit in parallel and stops, and one group of 2/2-way valve is connected in parallel；With it is described
Hydraulic lock and hydraulic cushion are played the role of in one group of balanced valve interconnection of one group of overflow valve connection；One group of 2/2-way valve with
One group of balanced valve is connected in parallel；One group of 2/2-way valve and one group of balanced valve and the dual-head conjoined asynchronous liquid
The left chamber of cylinder pressure is connect with right chamber hydraulic fluid port.
Hydraulic control method of the invention enables mower mechanism moving horizontally to be changed into and cut hydraulic cylinder piston rod
The rotary motion of toothed burclover, the angle of rotation are can be controlled within 270 degree, and cooperation hydraulic control system can allow grass-cutting head any
Position locking is, it can be achieved that grass-cutting head in ground location float function, can buffer the impact from grass-cutting head or working arm, and energy is certainly
Dynamic tensioning rotary-chain.
Illustrate grass trimmer and hydraulic control implementation method of the invention below by multiple embodiments.
Embodiment 1
As shown in figure 3, present embodiment discloses a kind of intelligent, automatically controlled, all-hydraulic grass trimmers comprising grass-cutting head, intelligence
Rotating mechanism and its hydraulic, electric-control system.It is mounted with a balladeur train 2 on a specialized truck 1, is equipped with a work on balladeur train 2
Make arm 3, working arm 3 is made of three joint arms 3a, 3b, 3c, and the end of third joint arm 3c is equipped with a grass-cutting head 4, third joint arm
3c is the steel pipe of a regular hexagon, the internal dual-head conjoined asynchronous hydraulic cylinder 5 that a regular hexagon is housed.Wherein, it mows
Head is connected to the side of working arm by connecting transmission shaft, guarantee while grass-cutting head rotates not with working arm interference and collision, and
It reliably can closely connect.
As shown in Fig. 1 a, 1b, there are two piston rod, the heads of each bar to connect one group of chain for dual-head conjoined asynchronous hydraulic cylinder 5
Item 6,7, two groups of chains are fixed in a rotating wheel 8, and the rotation of rotating wheel 8 drives the rotary shaft 4a rotation of grass-cutting head 4, thus
Realize that grass-cutting head 4 rotates.In the centre of two groups of chains 6,7 and rotating wheel 8 there are two regulating wheel 9,10 is tensioned, for being tensioned chain
Item, and the rotation angle of 270 degree of the guarantee of rotating wheel 8 can be made.The two sides of rotating wheel 8 and rotary shaft 4a use a special tooth
Wheel construction 11, for connecting rotating wheel 8 and rotary shaft 4a.
As shown in Fig. 2, dual-head conjoined asynchronous hydraulic cylinder 5, shape is a regular hexagon, and the rear portion of cylinder barrel 500 is installed
One intelligent hydraulic valve group 501, the inside of cylinder barrel there are two cavity, i.e. left chamber and right chamber, the inside there are two piston 502,503,
Two pistons are separately connected two piston rods 504,505, and in the front end of cylinder barrel, there are two guide sleeves 506,507 for installation, and two are led
It is fixed to set by end cap 508 with cylinder barrel, two chain fixing seats 510,511 are welded on the head of two piston rods.Special character
It is the small chamber of oil cylinder by 509 connection of aperture, for guaranteeing the overhang of dual-head conjoined asynchronous hydraulic cylinder piston rod 504
The retraction amount of=dual-head conjoined asynchronous hydraulic cylinder piston rod 505, the retraction amount of dual-head conjoined asynchronous hydraulic cylinder piston rod 504=bis-
The overhang of conjuncted asynchronous hydraulic cylinder piston rod 505.Oil cylinder bottom has a pin shaft hole 512 to be used to connect with working arm.
The intelligent hydraulic valve group 501 of the cylinder bottom of dual-head conjoined asynchronous hydraulic cylinder can move the level of oil cylinder by this mechanism
Turn becomes the rotary motion of grass-cutting head, and the angle of rotation is can be controlled within 270 degree, and grass-cutting head can be locked with any position,
The function that grass-cutting head floats in ground location can be achieved, the impact from grass-cutting head or working arm can be buffered, and can auto-tensioning
Rotary-chain.
Embodiment 2
The hydraulic control system that the present embodiment is designed according to the structure of embodiment 1.
As shown in figure 4, dual-head conjoined asynchronous cylinder device 37 is by two balanced valve 37a1,37a2, a check valve
37b, a dual-head conjoined asynchronous hydraulic cylinder composition with left chamber and right chamber 37c1,37c2.Two balanced valve 37a1,37a2,
One check valve 37b forms hydraulic circuit of the entirety for repairing and reduction external impact.Dual-head conjoined asynchronous hydraulic cylinder
The overhang of left chamber 37c1 is equal to the retraction amount of dual-head conjoined asynchronous hydraulic cylinder right chamber 37c2, dual-head conjoined asynchronous hydraulic cylinder left chamber
The retraction amount of 37c1 is equal to the overhang of dual-head conjoined asynchronous hydraulic cylinder right chamber 37c2, and the small intracavitary portion of two chamber, which is connected, to be passed through
O2 mouthfuls, and be connected by O1 mouthfuls with check valve 37b.Two balanced valves 37a1,37a2 connect the big of left and right chamber by hydraulic fluid port A, B
Chamber.
In order to realize grass-cutting head locking, floating, stress buffering etc. functions, can also increase tune on the basis of above system
Save valve block 36.
When ratio valve group 35 is in middle position, high-pressure oil passage P cut-off, guide's oil circuit LS cut-off, oil return line T connection, at this time
Overflow valve 36a1,36a2 of valve block 36 are used to adjust the pressure of hydraulic circuit, and 2/2-way valve 36b1,36b2 are used to control parallel connection
The logical of oil circuit is stopped, and hydraulic lock and hydraulic cushion are played the role of in balanced valve 36c1,36c2 interconnection, dual-head conjoined at this time asynchronous hydraulic
Cylinder 37 remains static.
Embodiment 3
The present embodiment is the left side oil inlet hydraulic principle explanation of embodiment 2.
As shown in figure 5, hydraulic oil enters from Pa mouthfuls, at this time the overflow valve of valve block 36 when ratio valve group 35 is at left side
36a2 is used to adjust, be arranged the pressure of hydraulic circuit, and when being higher than the pressure of setting, overflow valve 36a2 can pressure release.2/2-way
Valve 36b1 no power, is in off state, and hydraulic oil two-way enters from the check valve side of balanced valve 36c1, another way all the way
It is the access that a guide's oil circuit is used to open balanced valve 36c2, is used for oil return.Later, hydraulic oil enters dual-head conjoined from A mouthfuls
37c1 in asynchronous hydraulic cylinder 37, meanwhile, the 37c2 low-pressure hydraulic oil in dual-head conjoined asynchronous hydraulic cylinder 37 is flowed out from B mouthfuls, warp
Overbalance valve 36c2 returns to oil return line T from Pc mouthfuls.The piston rod of 37c1 in this way stretches out, and the piston rod of 37c2 is withdrawn, and pulls chain
Grass-cutting head is driven to be rotated clockwise.
Embodiment 4
The present embodiment is the right side oil inlet hydraulic principle explanation of embodiment 2.
As shown in fig. 6, hydraulic oil enters from Pc mouthfuls, at this time the overflow valve of valve block 36 when ratio valve group 35 is at right side
36a1 is used to adjust, be arranged the pressure of hydraulic circuit, and when being higher than the pressure of setting, overflow valve 36a1 can pressure release.2/2-way
Valve 36b2 no power, is in off state, and hydraulic oil two-way enters from the check valve side of balanced valve 36c2, another way all the way
It is the access that a guide's oil circuit is used to open balanced valve 36c1, is used for oil return.Later, hydraulic oil enters dual-head conjoined from B mouthfuls
37c2 in asynchronous hydraulic cylinder 37, meanwhile, the low-pressure hydraulic oil of the 37c1 in dual-head conjoined asynchronous hydraulic cylinder 37 is flowed out from A mouthfuls,
Oil return line T is returned to from Pa mouthfuls by balanced valve 36c1.The piston rod of 37c2 in this way stretches out, and the piston rod of 37c1 is withdrawn, pulling chain
Item drives grass-cutting head to be rotated counterclockwise.
Embodiment 5
The present embodiment is the hydraulic principle explanation that hydraulic control system when grass-cutting head floats according to embodiment 2 is implemented.
As shown in fig. 7, no hydraulic oil enters when ratio valve group 35 is at middle position, after starting 6 floating buttons of grass-cutting head,
2/2-way valve 36b1,36b2 are connected and connection oil circuit, cancels the effect of balanced valve 36c1,36c2, dual-head conjoined asynchronous liquid
The big chamber hydraulic circuit B of the big chamber hydraulic circuit A of cylinder pressure 37c1 and dual-head conjoined asynchronous hydraulic cylinder 37c1 are connected to oil return line T,
Asynchronous hydraulic cylinder 37 dual-head conjoined at this time can rotate under the action of 6 self gravity of grass-cutting head, and double end joins after with ground face contact
The asynchronous hydraulic cylinder piston rod of body can be moved according to the size of left and right chamber stress, so that grass-cutting head 6 be driven to rotate clockwise or inverse
Hour hands rotation, can be according to the difference of work ground line gradient, under the influence of 6 self gravity of grass-cutting head, always during enforcement
It keeps and ground level direction parallel contact.
Embodiment 6
The present embodiment is the hydraulic principle explanation for the small chamber repairing implemented according to the hydraulic control system of embodiment 2.
As shown in figure 8, hydraulic oil enters from Pa mouthfuls, at this time the overflow valve of valve block 36 when ratio valve group 35 is at left side
36a2 is used to adjust, be arranged the pressure of hydraulic circuit, and when being higher than the pressure of setting, overflow valve 36a2 can pressure release.2/2-way
Valve 36b1 no power, is in off state, and hydraulic oil two-way enters from the check valve side of balanced valve 36c1, another way all the way
It is the access that a guide's oil circuit is used to open balanced valve 36c2, is used for oil return.When small chamber in dual-head conjoined asynchronous hydraulic cylinder 37
Shortage of oil when, hydraulic oil can enter from the check valve side in 37a1, by check valve 37b from O1 mouthfuls enter it is dual-head conjoined asynchronous
In the small chamber of hydraulic cylinder 37, when by it is full after, small cavity pressure is greater than big cavity pressure to close check valve 37b, completes repairing movement.Together
Reason, when ratio valve group 35 is at right side, at left side principle it is identical, can equally complete repairing movement.
Embodiment 7
The present embodiment be system by left side pulling force when according to embodiment 2 hydraulic control system implement hydraulic principle say
It is bright.
As shown in figure 9, ratio valve group 35, in middle position, when left side is by larger external force or inertia force, chain pulls 37c1's
Piston rod stretches out, then the piston rod of 37c2 is withdrawn, hydraulic oil is flowed out from B mouthfuls, by the check valve in balanced valve 37a2, works as pressure
After power is greater than the pressure of balanced valve 37a1 setting, opens balanced valve 37a1 and enters in dual-head conjoined asynchronous hydraulic cylinder 37c1 from A mouthfuls,
Rotate clockwise grass-cutting head, to buffer external impacts.
Embodiment 8
The present embodiment be system by right side pulling force when according to embodiment 2 hydraulic control system implement hydraulic principle say
It is bright.
As shown in Figure 10, ratio valve group 35 is in middle position, and when right side is by larger external force or inertia force, chain pulls 37c2's
Piston rod stretches out, then the piston rod of 37c1 is withdrawn, hydraulic oil is flowed out from A mouthfuls, by the check valve in balanced valve 37a1, works as pressure
After power is greater than the pressure of balanced valve 37a2 setting, opens balanced valve 37a2 and enters in dual-head conjoined asynchronous hydraulic cylinder 37c2 from B mouthfuls,
Rotate grass-cutting head counterclockwise, to buffer external impacts.
Finally, it should be noted that obviously, the above embodiment is merely an example for clearly illustrating the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the art, it can also do on the basis of the above description
Other various forms of variations or variation out.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
The obvious changes or variations that Shen goes out are still in the protection scope of this invention.
Claims (17)
1. a kind of grass trimmer, which is characterized in that the grass trimmer includes grass-cutting head, hydraulic control system and rotating mechanism, wherein
The hydraulic control system includes intelligent hydraulic valve group, and the rotating mechanism includes dual-head conjoined asynchronous hydraulic cylinder, described
Intelligent hydraulic valve group is connected to the bottom of the dual-head conjoined asynchronous hydraulic cylinder of the rotating mechanism, described dual-head conjoined for controlling
Oil inlet, oil return or the repairing of asynchronous hydraulic cylinder；
The dual-head conjoined asynchronous cylinder chamber is divided into cavity equal in magnitude and parallel arrangement of left chamber and right chamber, wherein
The left chamber and right chamber are respectively equipped with the identical piston of size and piston rod, and the left chamber and right chamber are respectively by intracavitary work
Plug and piston rod are divided into the small chamber positioned at piston rod front end and the big chamber positioned at piston rod rear end；
In the front end and the right chamber for being located at the small chamber of the left chamber between the small chamber of the left chamber and the small chamber of the right chamber
The front end of small chamber is equipped with communication port；
The end of the left chamber and each arrogant chamber of right chamber is equipped with hydraulic fluid port, oil inlet or oil return is used for, so that described dual-head conjoined asynchronous
The overhang of hydraulic cylinder left chamber piston rod is equal to the retraction amount of the dual-head conjoined asynchronous hydraulic cylinder right chamber piston rod, the double end
The retraction amount of conjuncted asynchronous hydraulic cylinder left chamber piston rod is equal to the overhang of the dual-head conjoined asynchronous hydraulic cylinder right chamber piston rod；
The end of the small chamber of the small chamber or right chamber of the left chamber is equipped with repairing mouth；
The piston rod head of each dual-head conjoined asynchronous hydraulic cylinder connects one group of chain by the chain fixing seat being welded to connect,
The fixation of chain described in every group is wrapped in the same rotating wheel, driving of the rotating wheel in the dual-head conjoined asynchronous hydraulic cylinder
The lower rotary shaft rotation for driving the grass-cutting head.
2. grass trimmer as described in claim 1, which is characterized in that the shape of the dual-head conjoined asynchronous hydraulic cylinder is positive six sides
Shape structure.
3. grass trimmer as described in claim 1, which is characterized in that the connection transmission shaft and the grass-cutting head of the rotating mechanism
Rotary shaft engage connection.
4. grass trimmer as described in claim 1, which is characterized in that the rotating mechanism further includes a pair of of regulating wheel, the tune
Section wheel is symmetrically set on the outside of the chain between the rotating wheel and the piston rod head of the dual-head conjoined asynchronous hydraulic cylinder, and is compressed
The chain.
5. grass trimmer as described in claim 1, which is characterized in that the rotation angle of the rotating wheel is 0-270 degree, rotation side
To for clockwise or counterclockwise.
6. grass trimmer as described in claim 1, which is characterized in that the grass trimmer further includes working arm, the working arm packet
The first joint arm, the second joint arm and third joint arm that three sections are mutually rotatablely connected are included, the third joint arm is the steel pipe of regular hexagon,
The third joint arm is provided with the dual-head conjoined asynchronous hydraulic cylinder of the rotating mechanism.
7. grass trimmer as claimed in claim 6, which is characterized in that the grass trimmer further includes balladeur train, and the working arm passes through
First joint arm is installed on the balladeur train.
8. grass trimmer as claimed in claim 7, which is characterized in that the grass trimmer is installed on fixed device by the balladeur train
Or in mobile device.
9. a kind of hydraulic control of the grass-cutting head in claim 1-8 in any grass trimmer with dual-head conjoined asynchronous hydraulic cylinder
Method processed, which is characterized in that the control method includes:
Left side hydraulic fluid port oil inlet to the dual-head conjoined asynchronous hydraulic cylinder, so that in the dual-head conjoined asynchronous hydraulic cylinder left chamber
Piston rod stretches out, while being made by the communication port between the small chamber of the dual-head conjoined asynchronous hydraulic cylinder left chamber and the small chamber of right chamber
The piston rod obtained in the dual-head conjoined asynchronous hydraulic cylinder right chamber retracts, the hydraulic fluid port oil return of the right chamber, so that the grass-cutting head
It rotates clockwise；
Right side hydraulic fluid port oil inlet to the dual-head conjoined asynchronous hydraulic cylinder, so that in the dual-head conjoined asynchronous hydraulic cylinder right chamber
Piston rod stretches out, while being made by the communication port between the small chamber of the dual-head conjoined asynchronous hydraulic cylinder right chamber and the small chamber of left chamber
The piston rod obtained in the dual-head conjoined asynchronous hydraulic cylinder left chamber retracts, the hydraulic fluid port oil return of the left chamber, so that the grass-cutting head
It rotates counterclockwise；
The left chamber of the dual-head conjoined asynchronous hydraulic cylinder is connected to way to cycle oil with the hydraulic fluid port of right chamber, makes grass-cutting head in itself weight
The lower rotation of power effect, the dual-head conjoined asynchronous hydraulic cylinder piston rod can be according to left and right chamber stress after grass-cutting head and ground face contact
Size and move, so that the grass-cutting head be driven to rotate clockwise or rotate counterclockwise, so that the grass-cutting head floats, with suitable
Answer the slope angle that ground is different.
10. hydraulic control method as claimed in claim 9, which is characterized in that the method also includes:
When the shortage of oil of small chamber in the dual-head conjoined asynchronous hydraulic cylinder, hydraulic oil can be entered by balanced valve and check valve,
Entered again by repairing mouth in the small chamber of the dual-head conjoined asynchronous hydraulic cylinder, after the small chamber is filled with, the small chamber pressure
Power is greater than big cavity pressure to close the check valve, completes repairing movement.
11. hydraulic control method as claimed in claim 9, which is characterized in that when so that the grass-cutting head rotating clockwise,
Enter hydraulic oil by ratio valve group, by the adjustment of the first overflow valve, the pressure of setting hydraulic circuit, so that when being higher than
When the pressure of setting, the first overflow valve pressure release；Hydraulic oil two-way later, all the way from the check valve side of the first balanced valve into
Enter, another way is the access that a guide's oil circuit is used to open the second balanced valve, is used for oil return；Oil of the hydraulic oil from the left chamber
Mouth enters the big chamber of the dual-head conjoined asynchronous hydraulic cylinder left chamber, meanwhile, right chamber low pressure in the dual-head conjoined asynchronous hydraulic cylinder
Hydraulic oil is flowed out from the hydraulic fluid port of the right chamber, returns to oil return line by second balanced valve.
12. hydraulic control method as claimed in claim 9, which is characterized in that when so that the grass-cutting head rotating counterclockwise,
Enter hydraulic oil by ratio valve group, by the adjustment of the second overflow valve, the pressure of setting hydraulic circuit, so that when being higher than
When the pressure of setting, the second overflow valve pressure release；Hydraulic oil two-way later, all the way from the check valve side of the second balanced valve into
Enter, another way is the access that a guide's oil circuit is used to open the first balanced valve, is used for oil return；Oil of the hydraulic oil from the right chamber
Mouth enters the big chamber of the dual-head conjoined asynchronous hydraulic cylinder right chamber, meanwhile, left chamber low pressure in the dual-head conjoined asynchronous hydraulic cylinder
Hydraulic oil is flowed out from the hydraulic fluid port of the left chamber, returns to oil return line by first balanced valve.
13. hydraulic control method as claimed in claim 9, which is characterized in that when so that the grass-cutting head floating,
Ratio valve group is in middle position, and one group of 2/2-way valve is respectively turned on two hydraulic circuits parallel with one another and connection oil circuit, makes
The big chamber hydraulic circuit hydraulic fluid port of the dual-head conjoined asynchronous hydraulic cylinder left chamber and big chamber hydraulic circuit hydraulic fluid port and the institute of the right chamber
State the oil return line connection of ratio valve group.
14. such as the described in any item hydraulic control methods of claim 9 to 13, which is characterized in that the dual-head conjoined asynchronous liquid
The overhang of cylinder pressure left chamber piston rod is equal to the retraction amount of dual-head conjoined asynchronous hydraulic cylinder right chamber piston rod, dual-head conjoined asynchronous liquid
The retraction amount of cylinder pressure left chamber piston rod is equal to the overhang of dual-head conjoined asynchronous hydraulic cylinder right chamber piston rod, the left chamber and right chamber
Small intracavitary portion be connected, and be connected by the repairing mouth of the left chamber or right chamber with check valve；4th balanced valve passes through oil
Mouth connects the big chamber of the left chamber, and third balanced valve connects the big chamber of the right chamber by hydraulic fluid port.
15. hydraulic control method as claimed in claim 14, which is characterized in that
Buffering left side external impacts when, hydraulic oil from the right chamber hydraulic fluid port of the dual-head conjoined asynchronous hydraulic cylinder flow out, by with institute
The check valve in the third balanced valve of dual-head conjoined asynchronous hydraulic cylinder connection is stated, when pressure is arranged side by side greater than with the third balanced valve
After the pressure for the 4th balanced valve setting being arranged, the 4th balanced valve is opened, from a left side for the dual-head conjoined asynchronous hydraulic cylinder
Chamber hydraulic fluid port enters in the big chamber of the dual-head conjoined asynchronous hydraulic cylinder；
Buffering right side external impacts when, hydraulic oil from the left chamber hydraulic fluid port of the dual-head conjoined asynchronous hydraulic cylinder flow out, by with institute
The check valve in the 4th balanced valve of dual-head conjoined asynchronous hydraulic cylinder connection is stated, when pressure is arranged side by side greater than with the 4th balanced valve
After the pressure of the third balanced valve setting of setting, the third balanced valve is opened, from the right side of the dual-head conjoined asynchronous hydraulic cylinder
Chamber hydraulic fluid port enters in the big chamber of the dual-head conjoined asynchronous hydraulic cylinder.
16. hydraulic control method as claimed in claim 9, which is characterized in that the method also includes:
When left side is by larger external force or inertia force, the piston rod of the dual-head conjoined asynchronous hydraulic cylinder left chamber stretches out, the right side
The piston rod of chamber is withdrawn, and hydraulic oil is flowed out from the hydraulic fluid port of the right chamber, to buffer left side external impacts；
When right side is by larger external force or inertia force, the piston rod of the dual-head conjoined asynchronous hydraulic cylinder right chamber stretches out, the left side
The piston rod of chamber is withdrawn, and hydraulic oil is flowed out from the hydraulic fluid port of the left chamber；With buffering right side external impacts.
17. hydraulic control method as claimed in claim 9, which is characterized in that the method also includes when grass-cutting head is static not
When rotation,
Enter hydraulic oil by ratio valve group, when the ratio valve group is in middle position, the high-pressure oil passage of the ratio valve group
Cut-off, the guide's oil circuit cut-off of the ratio valve group, the oil return line of the ratio valve group are connected, are connect with the ratio valve group
One group of overflow valve is used to adjust the pressure of hydraulic circuit, and one group of overflow valve is connected in parallel；It is connect with one group of overflow valve
One group of 2/2-way valve be used to control oil circuit in parallel it is logical only, one group of 2/2-way valve is connected in parallel；With described one group
Hydraulic lock and hydraulic cushion are played the role of in first group of balanced valve interconnection of overflow valve connection；One group of 2/2-way valve and institute
First group of balanced valve is stated to be connected in parallel；One group of 2/2-way valve and first group of balanced valve and second group of balanced valve connect
It connects, second group of balanced valve is connect with the left chamber of the dual-head conjoined asynchronous hydraulic cylinder with right chamber hydraulic fluid port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710078804.7A CN107061407B (en) | 2017-02-14 | 2017-02-14 | The hydraulic control method of grass trimmer and its grass-cutting head |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710078804.7A CN107061407B (en) | 2017-02-14 | 2017-02-14 | The hydraulic control method of grass trimmer and its grass-cutting head |
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| CN107061407A CN107061407A (en) | 2017-08-18 |
| CN107061407B true CN107061407B (en) | 2019-06-21 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2172761Y (en) * | 1993-07-23 | 1994-07-27 | 郝晋升 | Asynchronous traction device |
| JPH08114205A (en) * | 1994-10-14 | 1996-05-07 | Nissan Shatai Co Ltd | Cylinder device |
| DE10121014A1 (en) * | 2001-04-28 | 2002-11-21 | Deere & Co | mowing |
| CN100567730C (en) * | 2007-06-21 | 2009-12-09 | 吕权 | Hydraulic drive fluid pump |
| CN204152894U (en) * | 2014-09-23 | 2015-02-11 | 福建龙合机械制造有限公司 | A kind of can the hydraulic lock of bidirectional pressure regulating |
| CN104389842A (en) * | 2014-11-10 | 2015-03-04 | 重庆市西华机械制造有限公司 | Material cutting machine driving device |
| CN204628145U (en) * | 2015-01-09 | 2015-09-09 | 巢湖学院 | A kind of integrated oil cylinders |
| CN206522294U (en) * | 2017-02-14 | 2017-09-26 | 德迈智能装备有限公司 | A kind of dual-head conjoined asynchronous hydraulic cylinder, the rotating mechanism and hay mover of grass-cutting head |
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2017
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