CN109458370A - A kind of hydraulic system based on inverted flux control system - Google Patents
A kind of hydraulic system based on inverted flux control system Download PDFInfo
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- CN109458370A CN109458370A CN201811482507.XA CN201811482507A CN109458370A CN 109458370 A CN109458370 A CN 109458370A CN 201811482507 A CN201811482507 A CN 201811482507A CN 109458370 A CN109458370 A CN 109458370A
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Classifications
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
Abstract
The present invention provides a kind of hydraulic systems based on inverted flux control system, flow control pressure reducing valve (9), selector valve two and selector valve one are increased in existing inverted flux control system-based, when using what's new valve group, former function valve group is closed by selector valve two and selector valve one, and flow control valve (5) and flow control pressure reducing valve are connected to, the flow of what's new valve group is regulated and controled by flow control pressure reducing valve.It does not need to increase new pump present invention can be implemented in what's new valve group is arranged on the basis of existing inverted flux control system, it is connected on original flow control valve by flow control pressure reducing valve, the flow of main pump is controlled, to make newly-increased executing agency obtain required flow, act to flow system flow multifarious demand increased because having newly increased executing agency can be achieved, simple and convenient, feasibility is strong, effectively extends former inverted flux control systematic difference range.
Description
Technical field
The present invention relates to construction machinery hydraulic system field, especially a kind of hydraulic pressure system based on inverted flux control system
System.
Background technique
Inverted flux control system is very widely used in engineering machinery field at present, because its service performance is stablized, manipulation
Well, especially on board a dredger, the excavator of most of brand is all made of inverted flux control system.Because of the market of excavator
Demand is big, and production batch is corresponding larger, is accordingly used in also big, the matter of batch production of hydraulic component production batch of excavator
Amount and production cost can be well controlled, so being used for hydraulic oil pump, hydraulic valve and the inverted flux control system of excavator
Cost performance it is very high, therefore, in many other engineering machinery, the especially hydraulic system of piling machinery product, have very much
The case of usage mining machine inverted flux control system.
Existing typical inverted flux control system structure is as shown in Figure 1, inverted flux control system includes feedback valve 1, master
Pump 3, pioneer pump 4, flow control valve 5 and several groups duty valve 16, each group of duty valve include a pilot operated directional control valve 161 and with
The pilot operated directional control valve corresponding proportional pressure-reducing valve 162 connects after the pilot operated directional control valve of each group duty valve is in parallel through feedback valve 1 and fuel tank
Logical, the hydraulic oil that main pump comes out flow to 1 inlet of feedback valve, meeting between 1 inlet of feedback valve and fuel tank after each group duty valve
There is a pressure difference P, the differential pressure action is on flow control valve 5, and when each group duty valve is no action, the pressure difference is maximum, makees
Maximum with the pressure on flow control valve 5, the swash plate that flow control valve 5 will push main pump at this time fades to minimum, at this time main pump
Flow it is minimum, when a certain group of duty valve has movement, (there is movement in i.e. corresponding executing agency, and corresponding pilot valve is changed with hydraulic control
Have movement to valve), above-mentioned pressure difference can become smaller, and main pump swash plate angle can become larger under the effect of the power of the spring of flow control valve 5,
Main pump flow can become larger therewith, until when whole valve groups have movement, the maximum flow of pump.
Since the valve group quantity in inverted flux control system is usually fixed, the inverted flux control system as used in excavator
Unified there was only 7 groups of duty valves altogether, each group duty valve is that all integrated form is processed together, and does not reserve spare duty valve, such as
Fruit Other Engineering is mechanical or stake chemical product amount of action is more than the quantity that excavator inverted flux control system can be provided, every increase
A kind of movement just needs to increase accordingly a set of duty valve.Since former duty valve and main pump flow are all mutually matched, each group
Duty valve controls set of execution mechanism, and every suit executing agency completes a kind of movement, by the function to be realized of each executing agency
Difference can and be acted, merely required for it what's new valve can not be made to obtain after main pump outlet connects what's new valve
Flow.
Therefore, if Other Engineering is mechanical or piling machinery needs to increase new movement, in addition to increasing corresponding duty valve,
It also needs to increase new pump to carry out the flow needed for providing newly-increased executing agency, causes increased costs, and installation space also can be by
To certain restrictions, therefore, existing inverted flux control system is larger in Function Extension this respect limitation, and not only cost is excessively high,
Feasibility is not also strong.Therefore, a kind of scheme is needed in the prior art to solve this problem.
Summary of the invention
It is an object of that present invention to provide a kind of hydraulic systems based on inverted flux control system, to solve to mention in background technique
Out the problem of.
A kind of hydraulic system based on inverted flux control system, including feedback valve 1, main pump 3, pioneer pump 4, flow control valve
5, selector valve 28, flow control pressure reducing valve 9 and several groups what's new valve 6, each what's new valve is in parallel with former duty valve to be connected
It connects, each group of what's new valve includes comparing 63, newly-increased pilot operated directional control valves 61 of valve and for controlling the newly-increased liquid controlled reversing
The newly-increased proportional pressure-reducing valve 62 of valve.
The newly-increased proportional pressure-reducing valve is provided with signal hydraulic fluid port A and signal hydraulic fluid port B, and signal hydraulic fluid port A and signal hydraulic fluid port B distinguish
Two hydraulic control signal ports of newly-increased pilot operated directional control valve are connected to, are also connected between the signal hydraulic fluid port A and signal hydraulic fluid port B described
Compare valve 63, two oil inlets for comparing valve are separately connected signal hydraulic fluid port A and signal hydraulic fluid port B, the flow control pressure reducing valve band
There is outside control mouth K, the oil outlet for comparing valve connects the outside control mouth K of the flow control pressure reducing valve, compares the oil outlet outflow of valve
Pressure oil is the pressure oil for the signal hydraulic fluid port that pressure is big in both signal hydraulic fluid port A and signal hydraulic fluid port B.
The oil inlet J of the flow control pressure reducing valve 9 is connected to guide's pump discharge, the flow control pressure reducing valve internal junction
Structure is arranged so that the maximum oil pressure of oil outlet C and/or minimum oil pressure adjustable (the maximum oil pressure of oil outlet C and minimum oil pressure
Can specifically be adjusted according to the required flow of newly-increased executing agency), and outside control mouth K input pressure is bigger, oil outlet C's is fuel-displaced
Pressure is smaller, and the oil outlet C of flow control pressure reducing valve is connected to the selector valve two, the entrance and selector valve of the feedback valve 1
Two connections, the outlet of selector valve two are connected to flow control valve 5, and selector valve two is for connecting flow control valve with feedback valve
Or connect between both states and switch with flow control pressure reducing valve, to make main pump when driving former executing agency, by former anti-
It presents valve 1 and carries out flow control, and when driving newly-increased executing agency, then flow control is carried out by flow control pressure reducing valve, not
While influencing former duty valve and former actuating mechanism function, and newly-increased executing agency can be made to obtain required stream at work
Amount.
Further, the hydraulic system based on inverted flux control system further includes switch valve 2, and the switch valve 2 connects
The oil circuit end of each former pilot operated directional control valve after parallel connection is connect, and is located at the feedback valve upstream, each group original pilot operated directional control valve is simultaneously
End after connection is successively connected to through switch valve with feedback valve with fuel tank, and the hydraulic oil that main pump comes out first passes through after each group original duty valve
Switch valve 2, then it is flow to 1 inlet of feedback valve, switch valve 2 is used to close when flow control pressure reducing valve is connected with flow control valve
Oil circuit between each original pilot operated directional control valve and feedback valve.
Further, the hydraulic system based on inverted flux control system further includes selector valve 1, compares the fuel-displaced of valve
Mouth is divided into two-way, connects the outside control mouth K of the flow control pressure reducing valve all the way, and another way connects the oil inlet of selector valve one, institute
Stating switch valve is pilot operated directional control valve, and the oil outlet of selector valve one and the pilot control hydraulic fluid port of switch valve connect, and selector valve one is used for
When switch valve needs to close the oil circuit between each former pilot operated directional control valve and feedback valve, the guide oil of switch valve is made to connect and obtain
Commutate power.
Preferably, the relatively valve uses shuttle valve, and the selector valve one is all made of solenoid directional control valve with selector valve two.
Further, the flow control pressure reducing valve 9 includes valve body 90, spool 92, spring 93 and adjusts screw 94, valve body
Interior to be equipped with valve chamber 91, oil inlet J, oil outlet C communicate with valve chamber with outside control mouth K, the valve chamber inner wall at oil outlet C and spool it
Between be equipped with throttle structure 97, the spool is arranged in valve chamber, and valve body is equipped with the screw hole 95 for being passed through valve chamber, also sets on valve body
Have and be passed through screw hole and the drain tap 96 for being connected to fuel tank, the adjusting screw rotation is located in screw hole, and the spring is supported and set
Adjusting between screw and spool, the elastic force direction of the spring along the direction setting for being directed toward outside control mouth K, oil inlet J with it is fuel-displaced
Mouth C is normal open state, when the pressure oil of outside control mouth K overcomes the elastic force of spring 93 to keep spool mobile towards the direction far from outside control mouth K
When, due to the presence of throttle structure 1, the pressure of oil outlet C becomes smaller, and the oil pressure of outside control mouth K is bigger, and the pressure of oil outlet C is got over
Small, the flow of main pump is bigger.In order to meet the needs of different newly-increased mechanisms are to flow, the spring of specific elastic force can be set to limit
The maximum stream flow of main pump processed, and the minimum discharge of main pump can be adjusted by adjusting adjusting screw.
The newly-increased proportional pressure-reducing valve is manual proportional pressure-reducing valve, and manual proportional pressure-reducing valve has operation handle, works as operation
The amplitude of handle is bigger, and corresponding signal hydraulic fluid port A or signal hydraulic fluid port B oil pressure are bigger, and corresponding relatively valve outlet oil pressure is bigger, outside
The oil pressure that control mouth K is obtained is bigger, and the oil pressure that oil outlet C and flow control valve obtain is smaller, and main pump flow is bigger, corresponds to this manually
The flow that the executing agency of proportional pressure-reducing valve obtains is also bigger.
Further, the quantity of the what's new valve be two groups when, two groups of what's new valves respectively included by comparison
The outlet of valve need to be connected to the secondary comparison of two entrances progress that second level compares valve 64, then the outlet for comparing valve through second level flows into
Outside control mouth K, if there is three groups, comparison valve included by third group what's new valve should compared with second level valve outlet pressure into
Row compares, subsequent to have what's new valve group again also, in this way can guarantee when there is multiple groups to increase executing agency's movement newly,
Maximum that group of executing agency of flow demand can obtain required flow.Second level, which compares valve and other relatively valves at different levels, can be used
Shuttle valve.
Further, the exit of the pioneer pump is connected with overflow valve 41, is arranged on the pipeline of overflow valve inlet one end
There is filter 42.
The present invention at least has the advantages that
The present invention provides a kind of hydraulic systems based on inverted flux control system, in existing inverted flux control system base
Flow control pressure reducing valve, selector valve two and selector valve one are increased on plinth, when using what's new valve group, pass through selector valve two
Former function valve group is closed with selector valve one, and is connected to flow control valve and flow control pressure reducing valve, the flow of what's new valve group
Regulated and controled by flow control pressure reducing valve.
It is not needed present invention can be implemented in what's new valve group is arranged on the basis of existing inverted flux control system
Increase new pump, be connected on original flow control valve by flow control pressure reducing valve, the flow of main pump is controlled, from
And flow required for obtaining newly-increased executing agency is, it can be achieved that increased movement is to system stream because having newly increased executing agency
Measure multifarious demand.And can change the parameter change of spring in flow control pressure reducing valve to limit the maximum stream flow of main pump,
By the minimum discharge of the adjusting adjustable pump of screw of pressure reducing valve, and the function valve group newly increased can select structure and system
The identical valve group of former function valve group, simple and convenient, feasibility is strong, effectively extends former inverted flux control systematic difference model
It encloses.Correspondingly, being applied on piling machinery or other Versatile Construction Machineries after excavator hydraulic system is carried out Function Extension
Also become to be very easy to realization.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to figure, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is existing inverted flux control system structure schematic diagram；
Fig. 2 is the structure principle chart of the hydraulic system based on inverted flux control system of the preferred embodiment of the present invention one；
Fig. 3 is the internal structure chart of the flow control pressure reducing valve in the preferred embodiment of the present invention one；
Fig. 4 is the structure principle chart of the hydraulic system based on inverted flux control system of the preferred embodiment of the present invention two.
In figure: 1- feedback valve, 2- switch valve, 3- main pump, 4- pioneer pump, 41- overflow valve, 42- filter, 5- flow control
Valve, 16- duty valve (former duty valve), 161- pilot operated directional control valve (former pilot operated directional control valve), (the former ratio decompression of 162- proportional pressure-reducing valve
Valve), 6- what's new valve, 61- increases pilot operated directional control valve newly, and 62- increases proportional pressure-reducing valve newly, and 63- compares valve, and 64- second level compares valve,
7- selector valve one, 8- selector valve two, 9- flow control pressure reducing valve, 90- valve body, 91- valve chamber, 92- spool, 93- spring, 94- tune
Save screw, 95- screw hole, 96- drain tap, 97- throttle structure one.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be limited according to claim
Fixed and covering multitude of different ways is implemented.
The hydraulic system embodiment one based on excavator inverted flux control system referring to fig. 2, including feedback valve 1, main pump
3, pioneer pump 4, flow control valve 5, selector valve 28,9 what's new valve 6 of flow control pressure reducing valve, each group of what's new valve packet
It includes and compares 63, newly-increased pilot operated directional control valves 61 of valve and the newly-increased proportional pressure-reducing valve 62 for controlling the newly-increased pilot operated directional control valve,
Former proportional pressure-reducing valve oil inlet included by newly-increased proportional pressure-reducing valve oil inlet included by each what's new valve and former duty valve
It is parallel-connected to the outlet of pioneer pump, newly-increased pilot operated directional control valve oil inlet included by each what's new valve is wrapped with former duty valve
The former pilot operated directional control valve oil inlet included is parallel-connected to the outlet of main pump.Excavator inverted flux control system generally has seven groups of original function
Three groups are only shown in energy threshold, the application Fig. 2 and Fig. 3, remaining four groups are not shown.
The newly-increased proportional pressure-reducing valve is provided with signal hydraulic fluid port A and signal hydraulic fluid port B, and signal hydraulic fluid port A and signal hydraulic fluid port B distinguish
Two hydraulic control signal ports of newly-increased pilot operated directional control valve are connected to, are also connected between the signal hydraulic fluid port A and signal hydraulic fluid port B described
Compare valve 63, two oil inlets for comparing valve are separately connected signal hydraulic fluid port A and signal hydraulic fluid port B, the flow control pressure reducing valve band
There is outside control mouth K, the oil outlet for comparing valve connects the outside control mouth K of the flow control pressure reducing valve, compares the oil outlet outflow of valve
Pressure oil is the pressure oil for the signal hydraulic fluid port that pressure is big in both signal hydraulic fluid port A and signal hydraulic fluid port B.
The oil inlet J of the flow control pressure reducing valve 9 is connected to guide's pump discharge, the flow control pressure reducing valve internal junction
Structure is arranged so that the maximum oil pressure of oil outlet C and minimum oil pressure adjustable (the maximum oil pressure of oil outlet C and minimum oil pressure tool
Body can be adjusted according to the required flow of newly-increased executing agency), and outside control mouth K input pressure is bigger, oil outlet C's goes out oil pressure
Power is smaller, and the oil outlet C of flow control pressure reducing valve is connected to the selector valve two, the entrance and selector valve two of the feedback valve 1
Connection, the outlet of selector valve two are connected to flow control valve 5, selector valve two for making flow control valve connecting with feedback valve or
It connects between both states and switches with flow control pressure reducing valve, to make main pump when driving former executing agency, fed back by original
Valve 1 carries out flow control, and when driving newly-increased executing agency, then flow control is carried out by flow control pressure reducing valve, in not shadow
While ringing original duty valve and former actuating mechanism function, and newly-increased executing agency can be made to obtain required flow at work.
The hydraulic pressure system based on inverted flux control system in the embodiment of the present invention one is all together switch valve 2, and the switch valve 2 connects
The oil circuit end of each former pilot operated directional control valve after parallel connection is connect, and is located at the feedback valve upstream, each group original pilot operated directional control valve is simultaneously
End after connection is successively connected to through switch valve with feedback valve with fuel tank, and the hydraulic oil that main pump comes out first passes through after each group original duty valve
Switch valve 2, then it is flow to 1 inlet of feedback valve, switch valve 2 is used to close when flow control pressure reducing valve is connected with flow control valve
Oil circuit between each original pilot operated directional control valve and feedback valve.
The hydraulic system based on inverted flux control system of the embodiment of the present invention one includes selector valve 1, compares going out for valve
Hydraulic fluid port is divided into two-way, connects the outside control mouth K of the flow control pressure reducing valve all the way, and another way connects the oil inlet of selector valve one,
The switch valve is 2/2-way pilot operated directional control valve, and the oil outlet of selector valve one and the pilot control hydraulic fluid port of switch valve connect, choosing
When selecting valve one for needing to close the oil circuit between each former pilot operated directional control valve and feedback valve in switch valve, make the guide oil of switch valve
It connects and obtains commutation power.
In the embodiment of the present invention one, the relatively valve uses shuttle valve, and the selector valve one is all made of two with selector valve two
Four-way electromagnetic reversing valve.
In the embodiment of the present invention one, the exit of pioneer pump is connected with overflow valve 41, on the pipeline of overflow valve inlet one end
It is provided with filter 42, the outlet of overflow valve is connected on the connecting line between main pump and fuel tank, to simplify pipeline, saves peace
Fill space.
Referring to Fig. 3, in the embodiment of the present invention one, flow control pressure reducing valve 9 includes valve body 90, spool 92, spring 93 and adjusts
Screw 94 is saved, is equipped with valve chamber 91 in valve body, oil inlet J, oil outlet C are communicated with valve chamber with outside control mouth K, the valve at oil outlet C
Throttle structure 97 is equipped between cavity wall and spool, the spool is arranged in valve chamber, and valve body is equipped with the screw for being passed through valve chamber
Hole 95 is additionally provided on valve body and is passed through screw hole and the drain tap 96 for being connected to fuel tank, and the adjustings screw, which revolves, is located at screw hole
Interior, the spring is supported to be located at and be adjusted between screw and spool, and the elastic force direction of the spring is set along the direction for being directed toward outside control mouth K
It sets, oil inlet J and oil outlet C are normal open state, when the pressure oil of outside control mouth K overcomes the elastic force of spring 93 to make spool towards far from outer
When controlling the direction movement of mouth K, due to the presence of throttle structure 97, the pressure of oil outlet C becomes smaller, and the oil pressure of outside control mouth K is bigger, out
The pressure of hydraulic fluid port C is smaller.
In the embodiment of the present invention one, the newly-increased proportional pressure-reducing valve is manual proportional pressure-reducing valve, manual proportional pressure-reducing valve band
There is operation handle, when the amplitude of operation handle is bigger, corresponding signal hydraulic fluid port A or signal hydraulic fluid port B oil pressure are bigger, corresponding comparison
Valve outlet oil pressure is bigger, and the oil pressure that outside control mouth K is obtained is bigger, and the oil pressure that oil outlet C and flow control valve obtain is smaller, main pump stream
Amount is bigger, and the flow that the executing agency of the corresponding manual proportional pressure-reducing valve obtains is also bigger.
Embodiment two referring to fig. 4, in embodiment two, the quantity of what's new valve is two groups, and two groups of what's new valves are each
It is connected respectively to the secondary comparison of two entrances progress that second level compares valve 64 from the outlet of included comparison valve, then through second level ratio
Outlet compared with valve flows into outside control mouth K, and the pressure that such outside control mouth K is obtained is some maximum signal hydraulic fluid port A of pressure value or signal
The pressure value of hydraulic fluid port B, and then guarantee that the movement of the respective execution mechanisms of maximum stream flow is needed to be accomplished.Second level compares valve and increases
The comparison valve of the second group of what's new valve added is all made of shuttle valve.The other structures of embodiment two are the same as example 1.
Comparative diagram 2~4, the course of work and principle of the embodiment of the present invention one and embodiment two approximately as:
When to use former function valve group, selector valve two is switched to left position, selector valve one is switched to right position, at this time former function
Each original pilot operated directional control valve and feedback valve included by energy threshold are on-state, and feedback valve inlet and flow control valve are also connection
The flow of state, main pump is adjusted by feedback valve with flow control valve jointly.
When what's new valve group to be used, selector valve two is switched to right position, selector valve one is switched to left position, former at this time
Each original pilot operated directional control valve and feedback valve are off-state included by duty valve, and feedback valve inlet is also disconnected with flow control valve
Open state, and flow control pressure reducing valve and flow control valve are on-state, it only need to be as operating former proportional pressure-reducing valve handle
The handle of newly-increased proportional pressure-reducing valve is operated, pressure signal can be provided to the outside control mouth K of flow control pressure reducing valve, and then to main pump
Flow regulated and controled.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of hydraulic system based on inverted flux control system, which is characterized in that including feedback valve (1), main pump (3), guide
(4), flow control valve (5), selector valve two (8), flow control pressure reducing valve (9) and several groups what's new valve (6) are pumped, it is each newly-increased
Duty valve is connected in parallel with former duty valve, and each group of what's new valve includes comparing valve (63), a newly-increased pilot operated directional control valve
(61) and for controlling the newly-increased proportional pressure-reducing valve (62) for increasing pilot operated directional control valve newly；
The newly-increased proportional pressure-reducing valve is provided with signal hydraulic fluid port A and signal hydraulic fluid port B, and signal hydraulic fluid port A is separately connected with signal hydraulic fluid port B
To two hydraulic control signal ports of newly-increased pilot operated directional control valve, the signal hydraulic fluid port A be also connected between signal hydraulic fluid port B it is described compared with
Valve (63), the flow control pressure reducing valve have outside control mouth K, and the oil outlet for comparing valve connects the outer of the flow control pressure reducing valve
Control mouth K；
The oil inlet J of the flow control pressure reducing valve (9) is connected to guide's pump discharge, the flow control pressure reducing valve internal structure
It is arranged so that maximum oil pressure and/or the minimum oil pressure of oil outlet C are adjustable, the oil outlet C of flow control pressure reducing valve is connected to institute
Selector valve two is stated, the entrance of the feedback valve (1) is connected to selector valve two, and the outlet of selector valve two is connected to flow control valve
(5), selector valve two for make flow control valve with feedback valve connect or with flow control pressure reducing valve connect both states it
Between switch.
2. a kind of hydraulic system based on inverted flux control system according to claim 1, which is characterized in that described to be based on
The hydraulic system of inverted flux control system further includes switch valve (2), and the switch valve is connected to each former liquid controlled reversing after parallel connection
The oil circuit end of valve, and be located at the feedback valve upstream, the end after each group original pilot operated directional control valve is in parallel successively through switch valve with
Feedback valve is connected to fuel tank.
3. a kind of hydraulic system based on inverted flux control system according to claim 2, which is characterized in that described to be based on
The hydraulic system of inverted flux control system further includes selector valve one (7), and the oil outlet for comparing valve is divided into two-way, all the way described in connection
The outside control mouth K of flow control pressure reducing valve, another way connect the oil inlet of selector valve one, and the switch valve is pilot operated directional control valve, choosing
The pilot control hydraulic fluid port of the oil outlet and switch valve of selecting valve one connects.
4. a kind of hydraulic system based on inverted flux control system according to claim 1, which is characterized in that the comparison
Valve uses shuttle valve, and the selector valve one is all made of solenoid directional control valve with selector valve two.
5. a kind of hydraulic system based on inverted flux control system according to claim 1, which is characterized in that the comparison
The pressure oil of the oil outlet outflow of valve is the pressure for the signal hydraulic fluid port that pressure is big in both signal hydraulic fluid port A and signal hydraulic fluid port B
Oil, the newly-increased proportional pressure-reducing valve are manual proportional pressure-reducing valve, and manual proportional pressure-reducing valve has operation handle, manual ratio decompression
The structure setting of valve at: when the amplitude of operation handle is bigger, corresponding signal hydraulic fluid port A or signal hydraulic fluid port B oil pressure are bigger, corresponding
Compare that valve outlet oil pressure is bigger, the oil pressure that outside control mouth K is obtained is bigger, and the oil pressure that oil outlet C and flow control valve obtain is smaller, main
Pump discharge is bigger, and the flow that the executing agency of the corresponding manual proportional pressure-reducing valve obtains is also bigger.
6. a kind of hydraulic system based on inverted flux control system according to claim 1, which is characterized in that described newly-increased
The quantity of duty valve is two groups, two groups of what's new valves respectively included by the outlet of comparison valve be connected to second level and compare valve
(64) two entrances carry out secondary comparison, then the outlet for comparing valve through second level flows into outside control mouth K.
7. a kind of hydraulic system based on inverted flux control system according to claim 1, which is characterized in that second level compares
Valve uses shuttle valve.
8. a kind of hydraulic system based on inverted flux control system according to claim 1, which is characterized in that the guide
The exit of pump is connected with overflow valve (41), and filter (42) are provided on the pipeline of overflow valve inlet one end.
9. a kind of hydraulic system based on inverted flux control system, feature described according to claim 1~any one of 8
It is, the flow control pressure reducing valve (9) includes valve body (90), spool (92), spring (93) and adjusts screw (94), in valve body
Equipped with valve chamber (91), oil inlet J, oil outlet C are communicated with valve chamber with outside control mouth K, the valve chamber inner wall at oil outlet C and spool it
Between be equipped with throttle structure (97), the spool is arranged in valve chamber, and valve body is equipped with the screw hole (95) for being passed through valve chamber, the tune
Section screw rotation is located in screw hole, and the spring is supported to be located at and be adjusted between screw and spool, and the elastic force direction edge of the spring refers to
It is arranged to the direction of outside control mouth K, oil inlet J and oil outlet C are normal open state.
10. a kind of hydraulic system based on inverted flux control system according to claims 1 to 9, which is characterized in that valve body
On be additionally provided with and be passed through screw hole and for being connected to the drain tap (96) of fuel tank.
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| CN201811482507.XA CN109458370B (en) | 2018-12-05 | 2018-12-05 | Hydraulic system based on negative flow control system |
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| CN201811482507.XA CN109458370B (en) | 2018-12-05 | 2018-12-05 | Hydraulic system based on negative flow control system |
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- 2018-12-05 CN CN201811482507.XA patent/CN109458370B/en active Active
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| JP2010048359A (en) * | 2008-08-22 | 2010-03-04 | Sumitomo (Shi) Construction Machinery Co Ltd | Pump control circuit of construction machine |
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| CN106499681A (en) * | 2016-12-27 | 2017-03-15 | 恒天九五重工有限公司 | A kind of power control system of hydraulic excavator |
| CN108286538A (en) * | 2017-01-10 | 2018-07-17 | 斗山英维高株式会社 | The hydraulic system of engineering machinery |
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| CN109458370B (en) | 2020-03-13 |
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