CN208719066U - Used with tractor hydraulic system and tractor - Google Patents
Used with tractor hydraulic system and tractor Download PDFInfo
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- CN208719066U CN208719066U CN201821398138.1U CN201821398138U CN208719066U CN 208719066 U CN208719066 U CN 208719066U CN 201821398138 U CN201821398138 U CN 201821398138U CN 208719066 U CN208719066 U CN 208719066U
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Abstract
The application discloses a kind of used with tractor hydraulic system and tractor.Wherein, the used with tractor hydraulic system, comprising: hydraulic cylinder；The reversal valve being connected with the hydraulic cylinder has changeable operating position and neutral position；For the reversal valve at operating position, the running of hydraulic power oil in the hydraulic cylinder passes through the reversal valve；When the reversal valve is located at neutral position, the hydraulic oil in the hydraulic cylinder can not pass through the reversal valve；The buffer gear being connected with the hydraulic cylinder；The buffer gear can be located at neutral position in the reversal valve, also, in the hydraulic cylinder at least partly the pressure of hydraulic oil be greater than predetermined pressure when, so that section hydraulic oil stream is gone out the hydraulic cylinder.The used with tractor hydraulic system and tractor can be maintained at a certain position in lifter oil cylinder and carry out overload protection.
Description
Technical field
This application involves field of agricultural machinery more particularly to a kind of used with tractor hydraulic system and tractors.
Background technique
Tractor is usually equipped with corresponding farm implements operating equipment using lifter when carrying out farmland operation.Tractor benefit
Lifter is driven with hydraulic oil, farm implements are promoted or declined by lifter, so that farm implements are moved to desired locations.
But lifter control valve of suppressing currently on the market does not have oil cylinder overload valve.Reason is: suppressing promotion
Device does not have position adjusting/feedback function；If overload valve is opened, it will gradually decrease and can not mend automatically so that being hung after lifter
Oil needs user to notice that manipulating lifting handle every now and then promotes farm implements, otherwise will eventually lead to farm implements under travel position and falls the moment
Ground, tractor can not continue to move ahead.
But due to there is no oil cylinder overload valve, it is meant that lifter oil cylinder is in neutral position in reversal valve and is maintained at a certain
When position, without overload protection.If farm implements bear to be more than the external force of design strength or generation of jolting under promotion state suddenly
Dynamic loading, it would be possible to cause hydraulic system to be revealed, structural member damage etc. Problem of Failure.
Utility model content
In view of the deficiencies in the prior art, the purpose of the application is to provide a kind of used with tractor hydraulic system and tractor, with
A certain position can be maintained in lifter oil cylinder carry out overload protection.
The technical solution of the application is as follows:
A kind of used with tractor hydraulic system, comprising:
Hydraulic cylinder；
The reversal valve being connected with the hydraulic cylinder has changeable operating position and neutral position；The commutation
For valve at operating position, the running of hydraulic power oil in the hydraulic cylinder passes through the reversal valve；The reversal valve is located at neutral position
When, the hydraulic oil in the hydraulic cylinder can not pass through the reversal valve；
The buffer gear being connected with the hydraulic cylinder；The buffer gear can be located at neutral position in the reversal valve,
Also, when at least partly the pressure of hydraulic oil is greater than predetermined pressure in the hydraulic cylinder, go out section hydraulic oil stream described hydraulic
Cylinder.
As a preferred embodiment, the hydraulic cylinder has the first cavity and the second cavity；The buffer gear
Be connected with the first cavity and/or the second cavity, the buffer gear the intracorporal pressure of be connected to chamber be greater than predetermined pressure when,
Go out the intracorporal section hydraulic oil stream of the chamber.
As a preferred embodiment, the buffer gear can also be less than pre- level pressure in the intracorporal pressure of be connected to chamber
When power, it is back to section hydraulic oil in be connected to cavity.
As a preferred embodiment, the hydraulic cylinder has first cavity and the second cavity separately
Piston；
When the hydraulic cylinder is passed through the first cavity and second chamber described in the piston press by external impact load
A cavity in body, when the hydraulic fluid pressure of the inside cavity being made to be greater than predetermined pressure, the buffer gear makes section hydraulic
Oil stream goes out the cavity；When the external impact load is laid down, the buffer gear makes section hydraulic oil be back to the cavity.
As a preferred embodiment, the reversal valve is by the first cavity described in the first pipeline connection, it is described to change
Pass through the second cavity described in the second pipeline connection to valve；The buffer gear and first pipeline and/or second pipeline
It is connected.
As a preferred embodiment, the predetermined pressure is greater than the operating pressure of the hydraulic cylinder.
As a preferred embodiment, the buffer gear has storage unit；The buffer gear is in be connected to chamber
When intracorporal pressure is greater than predetermined pressure, the storage unit inputs the section hydraulic oil of cavity output, and in be connected to cavity
When interior pressure is less than predetermined pressure, section hydraulic oil is back in the cavity by the storage unit.
As a preferred embodiment, the buffer gear includes accumulator；The predetermined pressure is the accumulation of energy
Initial pressure inside device.
As a preferred embodiment, the initial pressure inside the accumulator is 13-17Mpa, and/or, it is described
The reality of work pressure of hydraulic system is 8-12Mpa.
As a preferred embodiment, the accumulator be diaphragm accumulator, the diaphragm accumulator it is interior
Portion is filled with nitrogen.
As a preferred embodiment, the operating position includes raised position and/or down position；The commutation
When valve is located at the raised position, the hydraulic cylinder elongation；When the reversal valve is located at the down position, the hydraulic cylinder contracting
It is short.
As a preferred embodiment, first cavity is rodless cavity, second cavity is rod chamber；It is described
When reversal valve is located at the raised position, the first cavity input hydraulic pressure oil, the second cavity output hydraulic pressure oil；It is described to change
When being located at the down position to valve, the first cavity output hydraulic pressure oil, the second cavity input hydraulic pressure oil.
As a preferred embodiment, further include: the suspension assembly being connect with the hydraulic cylinder；The suspension assembly
With connecting pin；When the reversal valve is located at operating position, connecting pin described in the Driven by Hydraulic Cylinder is raised and lowered.
As a preferred embodiment, further include:
Fuel tank；
The hydraulic pump being connected between the fuel tank and the reversal valve, and
It is connected to the overflow valve of the hydraulic pump outlet, the outlet of the overflow valve is connected to the fuel tank.
A kind of tractor, comprising: used with tractor hydraulic system described in any embodiment as above.
The utility model has the advantages that
Used with tractor hydraulic system in the application is located at neutral position in the reversal valve, and in the hydraulic cylinder extremely
When the pressure of small part hydraulic oil is greater than predetermined pressure, go out section hydraulic oil stream by be equipped with buffer gear described hydraulic
Cylinder, it is seen then that the buffer gear remains with hydraulic cylinder still when reversal valve is located at neutral position to be further compressed
Space is allowed in this way in the case where farm implements receive external impact load, and hydraulic cylinder bears the external force of suddenly change or jolts
When dynamic loading when, the pressure oscillation of generation can be absorbed by buffer gear, generated certain decline buffering, avoided causing system
Pressure leakage reduces the probability of structural failure.
Referring to following description and accompanying drawings, the particular implementation of the utility model is disclosed in detail, specifies practical
Novel principle can be in a manner of adopted.It should be understood that the embodiments of the present invention in range not thus by
Limitation.In the range of the spirit and terms of appended claims, the embodiments of the present invention includes many changes, modifications
With it is equivalent.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
It uses in a other embodiment, is combined with the feature in other embodiment, or the feature in substitution other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step or component.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those skilled in the art, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the used with tractor hydraulic system structure schematic diagram that a kind of embodiment of the application provides；
Fig. 2 is the simplification figure of Fig. 1.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
It is practical new that this all should belong in technical staff's every other embodiment obtained without making creative work
The range of type protection.
It should be noted that it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein "and/or" packet
Include any and all combinations of one or more related listed items.
Please refer to Fig. 1, Fig. 2.There is provided a kind of used with tractor hydraulic system in the application embodiment, which can be with
Farm implements suspension including tractor.Wherein, which includes: hydraulic cylinder 1, changes with what the hydraulic cylinder 1 was connected
To valve 2 and the buffer gear 6 being connected with the hydraulic cylinder 1.
The hydraulic cylinder 1 has changeable operating position and neutral position.Wherein, the reversal valve 2 is in operating position
When, the running of hydraulic power oil in the hydraulic cylinder 1 passes through the reversal valve 2.When the reversal valve 2 is located at neutral position, the liquid
Hydraulic oil in cylinder pressure 1 can not pass through the reversal valve 2.
The buffer gear 6 can be located at neutral position, also, at least partly liquid in the hydraulic cylinder 1 in the reversal valve 2
When the pressure of pressure oil is greater than predetermined pressure, section hydraulic oil stream is made to go out the hydraulic cylinder 1.
Used with tractor hydraulic system in present embodiment is located at neutral position in the reversal valve 2, and described hydraulic
When at least partly the pressure of hydraulic oil is greater than predetermined pressure in cylinder 1, go out section hydraulic oil stream by the buffer gear 6 described
Hydraulic cylinder 1, it is seen then that the buffer gear 6 remains with hydraulic cylinder 1 still when reversal valve 2 is located at neutral position by into one
The space for walking compression, allows in this way in the case where farm implements receive external impact load, and hydraulic cylinder 1 bears the outer of suddenly change
When power or dynamic loading when jolting, the pressure oscillation of generation can be absorbed by buffer gear 6, generated certain decline buffering, kept away
Exempt from that system pressure is caused to leak, reduces the probability of structural failure.
In the application embodiment, the hydraulic cylinder 1 has the first cavity 11 and the second cavity 12.Specifically, hydraulic
Cylinder 1 has shell and the piston (not indicating) positioned at enclosure interior.The inner space sealed separation of shell is formed the by piston
One cavity 11 and the second cavity 12.The piston by the first cavity 11 and the second cavity 12 separately.Piston can be along shell
Internal slide, along with the movement of piston, the volume of the first cavity 11 and the second cavity 12 accordingly changes.
Correspondingly, power mechanism is when reversal valve 2 is located at operating position by adjusting the first cavity 11 and the second cavity 12
Volume, can change the position of piston is mobile.With the position change of piston inside housings, the piston that piston is connected
Corresponding change occurs for the length that bar 13 stretches out shell, whereby by hung agricultural implement mounting lifting.
In embodiment as shown in Figure 2, hydraulic cylinder 1 can be double acting hydraulic cylinder.Specifically, first cavity 11 is
Rodless cavity, second cavity 12 are rod chamber.When the reversal valve 2 is located at the raised position, first cavity 11 is defeated
Enter hydraulic oil, 12 output hydraulic pressure of the second cavity oil.When the reversal valve 2 is located at the down position, first cavity
11 output hydraulic pressures oil, 12 input hydraulic pressure of the second cavity oil.In conjunction with farm implements descending operation it is to be understood that the first cavity 11
To promote chamber, the second cavity 12 is decline chamber.It certainly in other embodiments can also be by lifting relationship and the first cavity and the
Two cavitys make opposite setting, the application and with no restriction.
For convenient for farm implements progress suspension lifting.The used with tractor hydraulic system can also include: and the hydraulic cylinder 1
The suspension assembly 9 of connection.The suspension assembly 9 has connecting pin 10.It is described hydraulic when the reversal valve 2 is located at operating position
Cylinder 1 drives the connecting pin 10 to be raised and lowered.Suspension assembly 9 hangs predetermined farm implements by the connection of connecting pin 10.
In embodiment as shown in Figure 1 and Figure 2, suspension assembly 9 can be link mechanism, can be by liquid by suspension assembly 9
The movement that the elongation of the piston rod 13 of cylinder pressure 1 is shortened is converted into the lifting of connecting pin 10.As shown in Figure 1 and Figure 2.Suspension assembly 9 can
To include that outer lift arm 15, interior lift arm 14 and hanging bar connect the lift shaft arm structure to be formed, outer lift arm 15 and interior
Lift arm 14 is hinged, and hinge joint position is fixed, and connects the connecting pin 10 by hanging bar.
Specifically, the piston rod 13 that 9 connection liquid cylinder pressure 1 of suspension assembly is stretched out.Wherein, 1 piston rod 13 of hydraulic cylinder is along phase
Horizontal direction is slightly slanted it is flexible, and connect in lift arm.Interior lift arm is connected with outer lift arm by connecting rod, real
Both existing linkage.To which when hydraulic cylinder 1 drives interior lift arm mobile, entire suspension assembly 9 realizes movement, finally makes
Connecting pin 10 generates lifting action.
In the application embodiment, the used with tractor hydraulic system, further includes: fuel tank 3；It is connected to the fuel tank 3
Hydraulic pump 4 between the reversal valve 2, and it is connected to the overflow valve 5 that the hydraulic pump 4 exports.For convenient for oil liquid overflow
After recycle, the outlet of the overflow valve 5 is connected to the fuel tank 3.
In the present embodiment, reversal valve 2 can realize the change of liquid flow path direction, so that hydraulic pump 4 be cooperated to realize hydraulic oil
The flexible control of cylinder.Reversal valve 2 can have multiple interfaces, to connect hydraulic pump 4 and hydraulic cylinder 1.As shown in Fig. 2, reversal valve 2
Two interfaces be respectively communicated with hydraulic cylinder 1, another two interface is separately connected hydraulic pump 4 and fuel tank 3.Reversal valve 2 passes through inside
The movement (such as rotation, sliding) of spool realizes that the connection of distinct interface blocks, to realize the cavity supplement of hydraulic cylinder 1
Oil liquid, another cavity export oil liquid.Wherein, which can be with solenoid directional control valve 2 or electro-hydraulic reversing valve 2, to realize automatic control
System.
In the present embodiment, the operating position includes raised position and/or down position.The reversal valve 2 is located at
When the raised position, the hydraulic cylinder 1 extends.Specifically, hydraulic pump 4 extracts fuel tank 3 when reversal valve 2 is located at raised position
In oil liquid be input in the first cavity 11 through reversal valve 2 and corresponding pipeline, meanwhile, the second cavity 12 is reduced by piston press,
Its internal oil liquid is entered in fuel tank 3 after corresponding pipeline, reversal valve 2.
When the reversal valve 2 is located at the down position, the hydraulic cylinder 1 shortens.Specifically, reversal valve 2 is located at decline
When position, hydraulic pump 4 extracts the oil liquid in fuel tank 3 and inputs in the second cavity 12 through reversal valve 2 and corresponding pipeline, meanwhile, first
Cavity 11 is reduced by piston press, its internal oil liquid is entered in fuel tank 3 after corresponding pipeline, reversal valve 2.
In the application embodiment, when reversal valve 2 is in operating position, the hydraulic oil in the hydraulic cylinder 1 can flow
Enter outflow.The hydraulic system be configured with farm implements when, when reversal valve 2 be in operating position, hydraulic cylinder 1 drive farm implements rising or under
Drop.When reversal valve 2 is in operating position, hydraulic oil in hydraulic cylinder 1 (not by external impact load the case where) can be protected
It holds static, correspondingly, to may remain in a certain position motionless for farm implements, carries out operation or mobile etc. with tractor.
In the application embodiment, overflow valve 5 can stablize the service load of the hydraulic system, play installation protection
Effect.Hydraulic pump 4, which is realized to the internal pressurization of hydraulic cylinder 1, is sent into hydraulic oil.Wherein, overflow valve 5 be connected to hydraulic pump 4 downstream or
Oil outlet.When hydraulic pump 4 passes through oil inside offering of the reversal valve 2 to hydraulic cylinder 1, passes through overflow valve 5 and carry out level pressure and voltage-stabilizing protection.
When system pressure increases to a certain extent, overflow valve 5 can be opened, the excess traffic withdrawing oil again for exporting hydraulic pump 4
In case 3, guarantee the constant of 5 inlet pressure of overflow valve namely 4 outlet pressure of hydraulic pump.
It, can will be between hydraulic cylinder 1 and hydraulic pump 4 when reversal valve 2 is in neutral position in the application embodiment
Oil liquid transmission cutting, the oil liquid amount between reversal valve 2 and hydraulic cylinder 1 do not change.At this point, farm implements are located at position holding
It is motionless.Correspondingly, buffer gear 6 can form buffering off-load to external shock loading at this time, hydraulic system, the buffering are protected
Mechanism 6 goes out the intracorporal section hydraulic oil stream of the chamber when the intracorporal pressure of be connected to chamber is greater than predetermined pressure.
To maintain hanging position of the farm implements when reversal valve 2 is located at neutral position, farm implements hanging position is avoided to rush because of buffering
It hits load and changes, and then influence farm implements practical effect.The buffer gear 6 can also be in the intracorporal pressure of be connected to chamber
When power is less than predetermined pressure, it is back to section hydraulic oil in be connected to cavity.Buffer gear 6 will be by that will flow out hydraulic cylinder 1
Oil liquid is back in hydraulic cylinder 1, maintains position of the piston in hydraulic cylinder 1 constant, to guarantee farm implements before jolting or impacting
Position afterwards is constant.
In the present embodiment, the hydraulic cylinder 1 is passed through the first chamber described in the piston press by external impact load
It is described slow when a cavity in body 11 and second cavity 12 makes the hydraulic fluid pressure of the inside cavity be greater than predetermined pressure
Punch mechanism 6 makes section hydraulic oil stream go out the cavity.When the external impact load is laid down, the buffer gear 6 makes part liquid
Pressure oil is back to the cavity.Wherein, external impact load can directly or through farm implements bear the external force of suddenly change for hydraulic cylinder 1
Or dynamic loading when jolting, the pressure of respective cavities is increased to by predetermined pressure or more by piston.
In the present embodiment, the system pressure of hydraulic system when buffer gear 6 can keep reversal valve 2 to be located at neutral position
Power will not actively change the hydraulic size inside hydraulic cylinder 1.Wherein, the pressure of at least partly hydraulic oil is big in the hydraulic cylinder 1
When predetermined pressure, section hydraulic oil stream is made to go out the hydraulic cylinder 1, so that the hydraulic of increase is laid down inside buffer gear 6,
Guarantee hydraulic cylinder 1 in pressure maintain in safe range, avoid because shock loading significantly increase hydraulic cylinder 1 internal hydraulic pressure due to
Damage hydraulic system.
In the present embodiment, buffer gear 6 can be for the cavity that is connected in the first cavity 11 and the second cavity 12
It is buffered, when be connected to inside cavity pressure is greater than predetermined pressure, hydraulic oil is allowed to flow out from the cavity.Specifically,
The reversal valve 2 is connected to first cavity 11 by the first pipeline 7.The reversal valve 2 is connected to described the by the second pipeline 8
Two cavitys 12.The buffer gear 6 is connected with first pipeline 7 and/or second pipeline 8.In other embodiment,
Pipeline connection the first cavity 11 and/or the second cavity 12 can also be additionally arranged in buffer gear 6, with the first pipeline 7, the second pipeline
8 not common palls.
In the embodiment having, buffer gear 6 can carry out buffering pressure stabilizing to the first cavity 11 and the second cavity 12 simultaneously,
For example, the first cavity 11 and the second cavity 12 are communicated with an accumulator.In view of being usually pair when by shock loading
It promotes chamber and forms compression shock, therefore the first cavity 11 can be communicated with to buffer gear 6, it is slow whether the second cavity 12 is communicated with
There is no restriction for punch mechanism 6, as preferred embodiment.
Wherein, to avoid buffer gear 6 from influencing the pressure state in hydraulic cylinder 1, predetermined pressure is in not less than reversal valve 2
1 inside normal pressure of hydraulic cylinder when neutral position.Certainly, predetermined pressure can be greater than hydraulic system reality of work pressure or
The operating pressure of person's hydraulic cylinder 1.When reversal valve 2 is located at operating position, buffer gear 6 is slightly larger than or the pipe with institute connecting pipe
Quite (namely the reality of work pressure of hydraulic system, this actual working pressure is with the matched farm implements of lifter for road internal pressure
It is different and change), it avoids buffer gear 6 from participating in influencing hydraulic system lifting farm implements, guarantees to go up and down going on smoothly for farm implements.
Preferably, the buffer gear 6 has storage unit for the oil liquid convenient for collecting outflow hydraulic cylinder 1.The buffer
For structure 6 when the intracorporal pressure of be connected to chamber is greater than predetermined pressure, the storage unit inputs the section hydraulic oil of cavity output, and
When the intracorporal pressure of be connected to chamber is less than predetermined pressure, section hydraulic oil is back in the cavity by the storage unit.
In specific embodiment, the buffer gear 6 may include accumulator.Accumulator can be gas type accumulator,
It may be spring accumul ator, can also be piston accumulator.In the present embodiment, the predetermined pressure is the accumulation of energy
Initial pressure inside device.The initial pressure of accumulator can be the pressure or initial elasticity power that gas is filled with inside it.?
External pressure is greater than the initial pressure of accumulator, and accumulator starts to carry out accumulation of energy.Wherein, when the first cavity 11 or the second cavity 12
When internal pressure is greater than the initial pressure of the accumulator, the air bag of accumulator is compressed, hydraulic oil enters accumulator whereby
In, thus by pressure oscillation or damping of shocks.
In the present embodiment, the initial pressure inside accumulator can be higher than the reality of work pressure of hydraulic system at least
5MPa guarantees the normal work of hydraulic system to guarantee to be independent of each other between the normal work of hydraulic system and the work of accumulator
Make.Specifically, the reality of work pressure of the hydraulic system is 8-12Mpa.For the normal work for avoiding interference hydraulic system, institute
Stating the initial pressure inside accumulator can be 18Mpa or more, it is preferred that the initial pressure of the accumulator can be 13-
17Mpa.It should be appreciated, however, that in actual application, the initial pressure of accumulator can in 13-17Mpa any value,
The application does not make related limitation.
In this embodiment, buffer gear 6 by be equipped with storage unit, can when the pressure of hydraulic system increases suddenly incite somebody to action
Extra energy (such as: the additional energy of the generations such as shock loading suffered by hydraulic cylinder 1), which is changed into compression energy or position, to be deposited
Storage is got up.After rinsing load disappearance or laying down, compression energy or position can be changed into inside hydraulic cylinder 1 by buffer gear 6 again
It is hydraulic to release, hydraulic system is made up again.
Specifically, the accumulator is diaphragm accumulator.Wherein, diaphragm accumulator structure is simply easy to maintain, and
Easy for installation, it is obvious that pressure oscillation buffers eradicating efficacy.Further, the inside of the diaphragm accumulator can be filled with nitrogen
Gas.
With reference to shown in Fig. 1.When reversal valve 2 is in raised position or down position, under the driving of hydraulic pump 4, oil liquid
Into in hydraulic cylinder 1, the promotion or decline of farm implements are hung after control.Accumulator is connected to the first cavity 11 for promoting farm implements
Side.When reversal valve 2 is in raised position or down position, since initial pressure (initial inflated gas pressure) is high inside accumulator
In the operating pressure of hydraulic cylinder 1, accumulator does not work.
When control reversal valve 2 is in neutral position, the oil liquid of two cavitys of hydraulic cylinder 1 is in closed state.At this point,
When jolting in tractor driving process, the rear farm implements that hang can be in the first chamber of closed hydraulic cylinder 1 under effect of inertia
The pressure that superelevation is generated in body 11, when this pressure is more than the initial pressure of accumulator, a part of oil liquid is can be absorbed in accumulator
Into the building block to avoid hypertonia damage hydraulic system.
It should be noted that buffer gear 6 is in this application limitation not with the embodiment where accumulator, for example,
Buffer gear 6 or cracking pressure are the high-voltage switch gear of the predetermined pressure, and the pressure inside hydraulic cylinder 1 is greater than described
When predetermined pressure, high-voltage switch gear is opened to lay down part oil liquid, shock loading is buffered etc..
A kind of tractor is also provided in the application embodiment, comprising: used with tractor described in any embodiment as above
Hydraulic system.
It is noted that drive section, running gear and other parts that the tractor that present embodiment provides has
(such as actuating element, power section) etc. can select any appropriate existing construction.To be clearly briefly described this embodiment party
Technical solution provided by formula will no longer repeat above-mentioned part herein, and Figure of description has also carried out corresponding simplification.But
It is it should be understood that therefore present embodiment is not restricted in range.
Herein cited any digital value all include between lower limit value to upper limit value with the lower value of an incremented and
The all values of upper value, there are the intervals of at least two units between any lower value and any much higher value.For example, such as
Fruit elaborates that the quantity an of component or the value of process variable (such as temperature, pressure, time etc.) are from 1 to 90, preferably from 20
To 80, more preferably from 30 to 70, then purpose is arrived in order to illustrate also clearly listing such as 15 to 85,22 in the specification
68,43 to 51,30 to 32 is equivalent.For the value less than 1, suitably think that a unit is 0.0001,0.001,0.01,0.1.
These are only intended to the example clearly expressed, it is believed that all possibility for the numerical value enumerated between minimum and peak
Combination is all expressly set forth in the specification in a similar manner.
Unless otherwise indicated, all ranges all include all numbers between endpoint and endpoint.It is used together with range
" about " or " approximation " be suitable for two endpoints of the range.Thus, " about 20 to 30 " are intended to cover that " about 20 to about
30 ", including at least the endpoint indicated.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Describing combined term " substantially by ... constitute " should include identified element, ingredient, component or step and reality
Other elements, ingredient, component or the step of the basic novel feature of the combination are not influenced in matter.Using term "comprising" or
" comprising " describes the combination of element here, ingredient, component or step it is also contemplated that substantially by these elements, ingredient, component
Or the embodiment that step is constituted.Here by using term " can with ", it is intended to illustrate that " can with " includes described any
Attribute is all optional.
Multiple element, ingredient, component or step can be provided by single integrated component, ingredient, component or step.Optionally
Ground, single integrated component, ingredient, component or step can be divided into multiple element, ingredient, component or the step of separation.It is used to
The open "a" or "an" for describing element, ingredient, component or step is not said to exclude other elements, ingredient, component
Or step.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
It states, many embodiments and many applications except provided example all will be aobvious and easy for a person skilled in the art
See.Therefore, the range of this introduction should not be determined referring to foregoing description, but should referring to appended claims and this
The full scope of the equivalent that a little claims are possessed determines.For comprehensive purpose, all articles and with reference to including special
The disclosure of benefit application and bulletin is all by reference to being incorporated herein.Theme disclosed herein is omitted in preceding claims
Any aspect is not intended to abandon the body matter, also should not be considered as inventor the theme is not thought of as it is disclosed
A part of utility model theme.
Claims (15)
1. a kind of used with tractor hydraulic system characterized by comprising
Hydraulic cylinder；
The reversal valve being connected with the hydraulic cylinder has changeable operating position and neutral position；The reversal valve exists
When operating position, the running of hydraulic power oil in the hydraulic cylinder passes through the reversal valve；When the reversal valve is located at neutral position, institute
The hydraulic oil stated in hydraulic cylinder can not be by the reversal valve；
The buffer gear being connected with the hydraulic cylinder；The buffer gear can be located at neutral position in the reversal valve, also,
When at least partly the pressure of hydraulic oil is greater than predetermined pressure in the hydraulic cylinder, section hydraulic oil stream is made to go out the hydraulic cylinder.
2. used with tractor hydraulic system according to claim 1, it is characterised in that: the hydraulic cylinder have the first cavity and
Second cavity；The buffer gear is connected with the first cavity and/or the second cavity, and the buffer gear is in be connected to cavity
Pressure be greater than predetermined pressure when, go out the intracorporal section hydraulic oil stream of the chamber.
3. used with tractor hydraulic system according to claim 2, it is characterised in that: the buffer gear can also be connected to
When the intracorporal pressure of chamber is less than predetermined pressure, it is back to section hydraulic oil in be connected to cavity.
4. used with tractor hydraulic system according to claim 3, it is characterised in that: the hydraulic cylinder has described first
The piston of cavity and the second cavity separately；
When the hydraulic cylinder is passed through in the first cavity and second cavity described in the piston press by external impact load
A cavity, make the inside cavity hydraulic fluid pressure be greater than predetermined pressure when, the buffer gear makes section hydraulic oil stream
The cavity out；When the external impact load is laid down, the buffer gear makes section hydraulic oil be back to the cavity.
5. used with tractor hydraulic system according to claim 2, it is characterised in that: the reversal valve is connected by the first pipeline
Lead to first cavity, the reversal valve passes through the second cavity described in the second pipeline connection；The buffer gear and described first
Pipeline and/or second pipeline are connected.
6. used with tractor hydraulic system according to claim 1, it is characterised in that: the predetermined pressure is greater than described hydraulic
The operating pressure of cylinder.
7. used with tractor hydraulic system according to claim 6, it is characterised in that: the buffer gear has storage unit；
For the buffer gear when the intracorporal pressure of be connected to chamber is greater than predetermined pressure, the storage unit inputs the part of cavity output
Hydraulic oil, and when the intracorporal pressure of be connected to chamber is less than predetermined pressure, section hydraulic oil is back to the chamber by the storage unit
In vivo.
8. used with tractor hydraulic system according to claim 7, it is characterised in that: the buffer gear includes accumulator；
The predetermined pressure is the initial pressure inside the accumulator.
9. used with tractor hydraulic system according to claim 8, it is characterised in that: the initial pressure inside the accumulator
For 13-17Mpa, and/or, the reality of work pressure of the hydraulic system is 8-12Mpa.
10. used with tractor hydraulic system according to claim 9, it is characterised in that: the accumulator is diaphragm type accumulation of energy
The inside of device, the diaphragm accumulator is filled with nitrogen.
11. used with tractor hydraulic system according to claim 2, it is characterised in that: the operating position includes promoting position
It sets and/or down position；When the reversal valve is located at the raised position, the hydraulic cylinder elongation；The reversal valve is located at institute
When stating down position, the hydraulic cylinder shortens.
12. used with tractor hydraulic system according to claim 11, it is characterised in that: first cavity is rodless cavity,
Second cavity is rod chamber；When the reversal valve is located at the raised position, the first cavity input hydraulic pressure oil is described
Second cavity output hydraulic pressure oil；When the reversal valve is located at the down position, the first cavity output hydraulic pressure oil, described the
Two cavity input hydraulic pressure oil.
13. -12 any used with tractor hydraulic system according to claim 1, which is characterized in that further include: with the liquid
The suspension assembly of cylinder pressure connection；The suspension assembly has connecting pin；When the reversal valve is located at operating position, the hydraulic cylinder
The connecting pin is driven to be raised and lowered.
14. -12 any used with tractor hydraulic system according to claim 1, which is characterized in that further include:
Fuel tank；
The hydraulic pump being connected between the fuel tank and the reversal valve, and
It is connected to the overflow valve of the hydraulic pump outlet, the outlet of the overflow valve is connected to the fuel tank.
15. a kind of tractor characterized by comprising the used with tractor hydraulic system as described in claim 1-14 is any.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821398138.1U CN208719066U (en) | 2018-08-28 | 2018-08-28 | Used with tractor hydraulic system and tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821398138.1U CN208719066U (en) | 2018-08-28 | 2018-08-28 | Used with tractor hydraulic system and tractor |
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| Publication Number | Publication Date |
|---|---|
| CN208719066U true CN208719066U (en) | 2019-04-09 |
Family
ID=65979878
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821398138.1U Active CN208719066U (en) | 2018-08-28 | 2018-08-28 | Used with tractor hydraulic system and tractor |
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| Country | Link |
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| CN (1) | CN208719066U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112640607A (en) * | 2019-10-21 | 2021-04-13 | 丰疆智能科技股份有限公司 | Rebounding device and agricultural machine serving as industrial machine lifting device |
-
2018
- 2018-08-28 CN CN201821398138.1U patent/CN208719066U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112640607A (en) * | 2019-10-21 | 2021-04-13 | 丰疆智能科技股份有限公司 | Rebounding device and agricultural machine serving as industrial machine lifting device |
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