CN105987033A - Low-energy-consumption multi-actuation-mechanism hydraulic system and excavator - Google Patents
Low-energy-consumption multi-actuation-mechanism hydraulic system and excavator Download PDFInfo
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- CN105987033A CN105987033A CN201510084445.7A CN201510084445A CN105987033A CN 105987033 A CN105987033 A CN 105987033A CN 201510084445 A CN201510084445 A CN 201510084445A CN 105987033 A CN105987033 A CN 105987033A
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Abstract
The invention relates to a low-energy-consumption multi-actuation-mechanism hydraulic system and an excavator. The low-energy-consumption multi-actuation-mechanism hydraulic system comprises a quantifying pump, a load sensitive pump and multiple actuation mechanisms; the actuation mechanisms at least include reversing valves, valve back compensators and actuation parts; the quantifying pump is at least communicated with one actuation mechanism; the load sensitive pump is communicated with each actuation mechanism in parallel; load feedback channels of all the actuation mechanisms are communicated with a main load feedback channel in parallel; the main load feedback channel is communicated with a flow control valve; the flow control valve is communicated with the load sensitive pump for controlling the flow of the load sensitive pump; and at least one actuation mechanism satisfies the following conditions: hydraulic oil provided by the load sensitive pump can be merged with hydraulic oil provided by the quantifying pump to flow into the reversing valves of the actuation mechanisms so as to supply oil to the actuation parts in the actuation mechanisms after passing through the reversing valves and the valve back compensators in the actuation mechanisms in sequence. The low-energy-consumption multi-actuation-mechanism hydraulic system has the characteristics of a load sensitive system, and solves the problem of response hysteresis.
Description
Technical field
The present invention relates to hydraulic machinery field, particularly relate to a kind of low energy consumption many executing agencies hydraulic pressure
System and excavator.
Background technology
Current excavator hydraulic system is broadly divided into variable system and the big class of quantitative system two, wherein,
Variable system be broadly divided into single pump or double pump load sensitive system, minus flow system, positive flow system,
The types such as constant displacement pump throttle system, the excavator of these four type is respectively arranged with feature: load sensitive system
Energy-saving effect is obvious, but maneuverability is poor；Minus flow system energy-conservation handling good, but perform more
The motion adaptive of mechanism is poor, and energy-saving effect is general；Energy-conservation and the operation of positive flow control system
Property is good, but the motion adaptive of many executing agencies is poor, relatively costly；The knot of throttle control system
Structure is simple, and cost is little, but energy consumption is high.
Either variable system or quantitative system, all there is drawback in the existing hydraulic system of excavator: in
Tonnage excavator load sensitive system is predominantly with discharge capacity double pump variable system, and load sensitive pump exists
The drawbacks such as response is delayed, and the stability of a system is poor；Tonnage minus flow is the same discharge capacity of double pump equally
, there is the drawbacks such as workload-adaptability is poor in hydraulic system；The control of positive flow pump hydraulic system is energy-conservation
And good operability, many executing agencies motion adaptive is poor, relatively costly；Throttle control system one
As be served only for mini-excavator system, system is simple, safeguards simple, and cost is little, and energy consumption is high.
Tonnage excavator is when composite move, and Dual-pump flow-converging operating mode is more, for ensureing composite move
Harmony, the motion speed between each executing agency reduces certain and performs when being essentially relying on composite move
Mechanism's pilot pressure or dependence are arranged on the choke valve being controlled by pilot pressure before action connection
Openings of sizes coordinates.This type of controls the mode of each executing agency motion speed, adds hydraulic pressure
The complexity of system, simultaneously too much throttle orifice adds the energy loss of main valve, excavator energy consumption
Higher.
Content of the invention
The purpose of the present invention is to propose to a kind of low energy consumption many executing agencies hydraulic system and excavator, its
There is the feature of load sensitive system, solve again asking of load sensitive system response lag simultaneously
Topic.
For achieving the above object, the invention provides a kind of low energy consumption many executing agencies hydraulic system,
It includes constant displacement pump, load sensitive pump and several executing agency, and described executing agency at least includes
Reversal valve, valve post-compensators and execution unit, described constant displacement pump at least with a described execution machine
Structure connects, described load sensitive pump and each described executing agency parallel communication；Each described execution machine
The load feedback passage parallel communication total load feedback channel of structure, described total load feedback channel is even
Through-current capacity control valve, the described load sensitive pump of described flow control valve connection, quick to described load
Sense pump carries out flow-control；
At least a described executing agency meets following condition:
The hydraulic oil that described load sensitive pump provides can pass sequentially through in this described executing agency
After reversal valve and valve post-compensators, this is described to collaborate entrance with the hydraulic oil that described constant displacement pump provides
Reversal valve in executing agency, and then be the execution unit fuel feeding in this described executing agency.
One, preferably or in alternative embodiment, described several executing agencies at least include the first execution
Mechanism and the second executing agency, described constant displacement pump is held with described first executing agency and described second
Row mechanism parallel communication；
Described first executing agency at least includes the first reversal valve, the first valve post-compensators and first
Execution unit；Described second executing agency at least includes the second reversal valve, the second valve post-compensators
With the second execution unit；
Under described first executing agency's duty: the hydraulic oil energy that described load sensitive pump provides
Enough pass sequentially through described first reversal valve and described first valve post-compensators, carry with described constant displacement pump
The hydraulic oil interflow of confession enters described first reversal valve, and then is described first execution unit fuel feeding；
Under described second executing agency's duty: the hydraulic oil energy that described load sensitive pump provides
Enough pass sequentially through described second reversal valve and described second valve post-compensators, carry with described constant displacement pump
The hydraulic oil interflow of confession enters described second reversal valve, and then is described second execution unit fuel feeding.
One, preferably or in alternative embodiment, described constant displacement pump connects with described second executing agency
Oil circuit on be provided with one-way throttle valve, described first executing agency and described second execution machine
During structure composite move, described constant displacement pump is preferentially to described first executing agency's fuel feeding.
Described first executing agency also includes first throttle one preferably or in alternative embodiment
Control valve, when described first throttle control valve is opened, wherein the one of described first execution unit
The oil return of individual actuator port can enter the control of described first throttle by described first reversal valve
Valve, again returns to described first reversal valve by described first throttle control valve, subsequently into institute
State another actuator port of the first execution unit, it is achieved flow regenerates.
Also including the 3rd executing agency one preferably or in alternative embodiment, the described 3rd performs
Mechanism includes the 3rd reversal valve, the 3rd valve post-compensators and the 3rd execution unit；Described first
When reversal valve, described second reversal valve and described 3rd reversal valve are positioned at middle position, described constant displacement pump
The hydraulic oil providing is sequentially connected in series the middle position through described first reversal valve, described second reversal valve
Middle position and the middle position of described 3rd reversal valve, flow into fuel tank.
Also including the 4th executing agency one preferably or in alternative embodiment, the described 4th performs
Mechanism includes the 4th reversal valve, the 4th valve post-compensators and the 4th execution unit；Described first
During reversal valve, described second reversal valve, described 3rd reversal valve and described 4th reversal valve are positioned at
Position when, described constant displacement pump provide hydraulic oil be sequentially connected in series the middle position through described first reversal valve,
The middle position of described second reversal valve, the middle position of described 3rd reversal valve and described 4th reversal valve
Middle position, flows into fuel tank.
One preferably or in alternative embodiment, in the middle position of described first reversal valve and described second
On the oil circuit of the middle position connection of reversal valve, side is connected to the first oil circuit, described in described first oil communication
The oil feeding line of load sensitive pump, described first oil circuit is provided with the first check valve and second section
Flow control valve.
One, preferably or in alternative embodiment, described second executing agency performs machine with the described 4th
During structure composite move, described second section flow control valve is opened, and described 4th executing agency is preferentially moved
Make, and the pressure of opening being arranged by described first check valve increases entering of described second reversal valve
Mouth pressure.
One, preferably or in alternative embodiment, described second executing agency performs machine with the described 3rd
During structure composite move, described second section flow control valve is closed, and described second executing agency is preferentially moved
Make.
One preferably or in alternative embodiment, in the middle position of described second reversal valve and the described 3rd
On the oil circuit of the middle position connection of reversal valve, side is connected to the second oil circuit, described in described second oil communication
The oil feeding line of load sensitive pump, described second oil circuit is provided with the second check valve.
One, preferably or in alternative embodiment, described constant displacement pump is sequentially connected in series connection described first and changes
To the middle position of valve, the middle position of described second reversal valve, the middle position of described 3rd reversal valve and described
The middle position of the 4th reversal valve, the oil circuit finally connecting with fuel tank is provided with counterbalance valve.
One, preferably or in alternative embodiment, the pressure oil that described constant displacement pump provides is single by the 3rd
Connect described executing agency, and described constant displacement pump and described first execution machine to valve in parallel or series
It is provided with the 4th check valve on the oil circuit of structure connection.
One, preferably or in alternative embodiment, described total load is fed back and is provided with choke valve on oil circuit.
One, preferably or in alternative embodiment, described reversal valve at least includes middle position, the first work
Position and the second working position, when described reversal valve is positioned at middle position, described constant displacement pump and described load are quick
Sense pump is not all to the described execution unit fuel feeding that described reversal valve is corresponding, and described reversal valve is positioned at
When the first working position and the second working position, described constant displacement pump and described load sensitive pump all can be to
The corresponding described execution unit fuel feeding of described reversal valve.
One, preferably or in alternative embodiment, described reversal valve is three nine and leads to reversal valve.
One, preferably or in alternative embodiment, described first executing agency is swing arm executing agency,
Described first execution unit is boom cylinder, and described second executing agency is rotary power unit,
Described second execution unit is rotary motor.
One, preferably or in alternative embodiment, described 3rd executing agency is dipper executing agency,
Described 3rd execution unit is bucket arm cylinder.
One, preferably or in alternative embodiment, described 4th executing agency is walking executing agency,
Described 4th execution unit is running motor.
One preferably or in alternative embodiment, on the load feedback passage of described 4th executing agency
It is provided with throttling shock absorbing valve.
For achieving the above object, present invention also offers a kind of excavator, it includes any of the above-described
Low energy consumption many executing agencies hydraulic system in embodiment.
Based on technique scheme, the present invention at least has the advantages that
Low energy consumption many executing agencies hydraulic system, quantitative system and the load-sensitive system that the present invention provides
System combines, and has both had the feature of load sensitive system, solves again load sensitive system simultaneously and rings
The problem answering hysteresis quality, and by constant displacement pump and load sensitive pump as power source, by constant displacement pump
Assignment of traffic, can reduce the energy loss of system, simplifies system cost and structure.
Low energy consumption many executing agencies hydraulic system that the present invention provides can be applied in engineering machinery, smelting
In the conglomerate hydraulic machineries such as gold machinery, mining machinery, water conservancy machinery.
Brief description
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the application
A part, the schematic description and description of the present invention is used for explaining the present invention, not structure
Become inappropriate limitation of the present invention.In the accompanying drawings:
The principle schematic of low energy consumption many executing agencies hydraulic system that Fig. 1 provides for the present invention.
Label in accompanying drawing:
1-load sensitive pump；2-choke valve；3-constant displacement pump；4-first throttle control valve；5-is unidirectional
Choke valve；6-the first valve post-compensators；7-the first reversal valve；8-the first check valve；9-second is single
To valve；10-second section flow control valve；11-the second valve post-compensators；12-the second reversal valve；13-
First execution unit；14-the second execution unit；15-the 3rd execution unit；16-the 4th enforcement division
Part；17-the 3rd reversal valve；18-the 4th reversal valve；19-the 3rd valve post-compensators；20-the 3rd
Check valve；21-throttles shock absorbing valve；22-the 4th check valve；23-the 4th valve post-compensators；24-
Counterbalance valve；25-the 5th check valve；26-the 6th check valve.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is carried out clearly
It Chu, is fully described by.Obviously, described embodiment is only a part of embodiment of the present invention,
Rather than whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art are not having
There is under the premise of making creative work the every other embodiment being obtained, broadly fall into present invention protection
Scope.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ",
"front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward "
Deng the orientation of instruction or position relationship for based on orientation shown in the drawings or position relationship, be only for
It is easy to describe the present invention and simplifying to describe, rather than the device of instruction or hint indication or element
Must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that right
The restriction of scope.
As it is shown in figure 1, low energy consumption many executing agencies hydraulic system schematic providing for the present invention
Embodiment, in this illustrative examples, low energy consumption many executing agencies hydraulic system includes constant displacement pump
3rd, load sensitive pump 1 and several executing agency, for example: one or more executing agency,
The flow of load sensitive pump 1 more than the flow of constant displacement pump 3, executing agency at least include reversal valve,
Valve post-compensators and execution unit, constant displacement pump 3 at least connects with an executing agency, loads quick
Sense pump 1 and each executing agency parallel communication；The load feedback passage parallel communication of each executing agency
Total load feedback channel, total load feedback channel connects flow control valve, and flow control valve connects
Load sensitive pump 1, responsive to load pump 1 carries out flow-control；On total load feedback oil circuit also
Choke valve 2 can be provided with.
At least an executing agency disclosure satisfy that following condition:
The hydraulic oil that load sensitive pump 1 provides can pass sequentially through the reversal valve in this executing agency
After valve post-compensators, enter in this executing agency with the hydraulic oil interflow that constant displacement pump 3 provides
Reversal valve, and then be the execution unit fuel feeding in this executing agency.
In above-mentioned illustrative examples, use the mode that constant displacement pump 3 and load sensitive pump 1 combine
There is provided power for executing agency, the low energy consumption many executing agencies hydraulic system making the present invention provide both had
There is the feature of load sensitive system, the problem simultaneously solving again load sensitive system response lag,
And by the assignment of traffic of constant displacement pump 3, the energy loss of system can be reduced, simplify system cost
And structure.
In the illustrative examples of low energy consumption many executing agencies hydraulic system that the present invention provides, number
Individual executing agency at least can include the first executing agency and the second executing agency, constant displacement pump 3 with
First executing agency and second executing agency's parallel communication；
First executing agency at least can include the first reversal valve the 7th, the first valve post-compensators 6 and
First execution unit 13；Second executing agency at least can include the second reversal valve the 12nd, the second valve
Post-compensators 11 and the second execution unit 14.
Under the duty of the first executing agency: the hydraulic oil that load sensitive pump 1 provides can
Pass sequentially through the first reversal valve 7 and the first valve post-compensators 6, the hydraulic pressure providing with constant displacement pump 3
Oil interflow enters the first reversal valve 7, then enters the first execution unit by the first reversal valve 7
13, it is the first execution unit 13 fuel feeding；Further, after by the first valve post-compensators 6,
Being provided with the 5th check valve 25, hydraulic oil passes through the first valve post-compensators 6 and the 5th check valve 25
Enter the first reversal valve 7 with the hydraulic oil interflow that constant displacement pump 3 provides.
Under the duty of the second executing agency: the hydraulic oil that load sensitive pump 1 provides can
Pass sequentially through the second reversal valve 12 and the second valve post-compensators 11, the liquid providing with constant displacement pump 3
Force feed interflow enters the second reversal valve 12, then enters the second execution by the second reversal valve 12
Parts 14, are the second execution unit 14 fuel feeding.Further, by the second valve post-compensators
Being provided with the 6th check valve 26 after 11, hydraulic oil is single by the second valve post-compensators 11 and the 6th
Enter the second reversal valve 12 to the hydraulic oil interflow that valve 26 and constant displacement pump 3 provide.
In the illustrative examples of low energy consumption many executing agencies hydraulic system that the present invention provides, fixed
One-way throttle valve 5 can be provided with, the on the amount oil circuit that connects with the second executing agency of pump 3
When one executing agency and second executing agency's composite move, due to the effect of one-way throttle valve 5,
Constant displacement pump 3 is preferential to first executing agency's fuel feeding, improves the motion adaptive of many executing agencies.
In the illustrative examples of low energy consumption many executing agencies hydraulic system that the present invention provides, the
One executing agency can also include first throttle control valve 4, first throttle control valve 4 dozens
When opening, the oil return of one of them actuator port of the first execution unit 13 can be by the first commutation
Valve 7 enters first throttle control valve 4, again returns to first by first throttle control valve 4 and changes
To valve 7, subsequently into another actuator port of the first execution unit 13, it is achieved flow regenerates.
Wherein, first throttle control valve 4 can be by another actuator port of the first execution unit 13
The hydraulic oil providing is opened.
Low energy consumption many executing agencies hydraulic system that the present invention provides can also include the 3rd execution machine
Structure, the 3rd executing agency includes that the 3rd reversal valve the 17th, the 3rd valve post-compensators 19 and the 3rd is held
Row parts 15；During at the first reversal valve, the 7th, the second reversal valve 12 and the 3rd reversal valve 17 are positioned at
During position, hydraulic oil that constant displacement pump 3 provides be sequentially connected in series the middle position through the first reversal valve 7, the
The middle position of two reversal valves 12 and the middle position of the 3rd reversal valve 17, flow into fuel tank.
Low energy consumption many executing agencies hydraulic system that the present invention provides can also include the 4th execution machine
Structure, the 4th executing agency includes that the 4th reversal valve the 18th, the 4th valve post-compensators 23 and the 4th is held
Row parts 16；At the first reversal valve the 7th, the second reversal valve the 12nd, the 3rd reversal valve 17 and the 4th
When reversal valve 18 is positioned at middle position, the hydraulic oil that constant displacement pump 3 provides is sequentially connected in series through the first commutation
The middle position of valve 7, the middle position of the second reversal valve 12, the middle position and the 4th of the 3rd reversal valve 17 are changed
To the middle position of valve 18, flow into fuel tank.Further, constant displacement pump 3 is sequentially connected in series connection and first changes
To the middle position of valve 7, the middle position of the second reversal valve 12, the middle position and the 4th of the 3rd reversal valve 17
The middle position of reversal valve 18, the oil circuit finally connecting with fuel tank can be provided with counterbalance valve 24.
In above-mentioned illustrative examples, constant displacement pump 3 oil circuit in parallel to the first executing agency and
Second executing agency's fuel feeding, by series connection to the 3rd executing agency and the 4th executing agency's fuel feeding.
Low energy consumption many executing agencies hydraulic system that the present invention provides, however it is not limited to include above-mentioned the
One executing agency, the second executing agency, the 3rd executing agency and the 4th executing agency, all right
The executing agency of more than four such as including the 5th executing agency, can set according to actual conditions
Put.
In the illustrative examples of low energy consumption many executing agencies hydraulic system that the present invention provides,
On the oil circuit that the middle position of the first reversal valve 7 connects with the middle position of the second reversal valve 12, side is connected to first
Oil circuit, the oil feeding line of the first oil communication load sensitive pump 1, the fuel feeding of load sensitive pump 1
Each executing agency of oil circuit parallel communication, the first oil circuit is provided with the first check valve 8 and second
Throttling control valve 10.
When the second executing agency and the 4th executing agency's composite move: second section flow control valve 10
Open, the preferential action of the 4th executing agency, and the unlatching pressure being arranged by the first check valve 8
Increase the inlet pressure of the second reversal valve 12, improve the motion adaptive of many executing agencies.
When the second executing agency and the 3rd executing agency's composite move: second section flow control valve 10
Close, the preferential action of the second executing agency, improve the motion adaptive of many executing agencies.
In the illustrative examples of low energy consumption many executing agencies hydraulic system that the present invention provides,
It other on the oil circuit that the middle position of the second reversal valve 12 connects with the middle position of the 3rd reversal valve 17 is connected to the
Two oil circuits, the oil feeding line of the second oil communication load sensitive pump 1, the second oil circuit is provided with
Second check valve 9, in the first executing agency and the second execution structure are positioned in the case of position,
The hydraulic oil that constant displacement pump 3 provides enters load-sensitive by the second check valve 9 on the second oil circuit
The oil feeding line of pump 1, can be the 3rd executing agency and the 4th executing agency's fuel feeding.
In the illustrative examples of low energy consumption many executing agencies hydraulic system that the present invention provides, fixed
The oil feeding line of amount pump 3 connects executing agency in parallel or series, and at the fuel feeding oil of constant displacement pump 3
Being provided with the 3rd check valve 20 on road, the pressure oil that described constant displacement pump 3 provides is unidirectional by the 3rd
Valve 20 enters executing agency in parallel or series, and oil feeding line and first of constant displacement pump 3 perform machine
It is provided with the 4th check valve 22 on the oil circuit of structure connection.
In the illustrative examples of low energy consumption many executing agencies hydraulic system that the present invention provides, change
At least include middle position, the first working position and the second working position to valve, when reversal valve is positioned at middle position,
Constant displacement pump 3, commutates all not to the execution unit fuel feeding that reversal valve is corresponding with load sensitive pump 1
When valve is positioned at the first working position and the second working position, constant displacement pump 3 and load sensitive pump 1 all can
To the corresponding execution unit fuel feeding of reversal valve.
Reversal valve at least includes nine hydraulic fluid ports, from the orientation shown in Fig. 1, reversal valve in figure
Right side is followed successively by the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port, the 4th hydraulic fluid port and the from top to bottom
Five hydraulic fluid ports, in figure the left side of reversal valve be followed successively by from top to bottom the 6th hydraulic fluid port, the 7th hydraulic fluid port,
Eight hydraulic fluid ports and the 9th hydraulic fluid port.In figure reversal valve be followed successively by from top to bottom the first working position, middle position and
Second working position.
Reversal valve is when middle position: the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port, the 5th hydraulic fluid port,
6th hydraulic fluid port, the 7th hydraulic fluid port and the 9th hydraulic fluid port are cut-off state, the 4th hydraulic fluid port connection the 8th oil
Mouthful；
Reversal valve is when the first working position: the first hydraulic fluid port and the connection of the 6th hydraulic fluid port, the second hydraulic fluid port,
4th hydraulic fluid port and the cut-off of the 8th hydraulic fluid port, the 3rd hydraulic fluid port connection the 7th hydraulic fluid port, the 5th hydraulic fluid port connection the
Nine hydraulic fluid ports；
Reversal valve is when the second working position: the first hydraulic fluid port, the 4th hydraulic fluid port and the cut-off of the 8th hydraulic fluid port,
Second hydraulic fluid port connection the 7th hydraulic fluid port, the 3rd hydraulic fluid port connection the 6th hydraulic fluid port；In first executing agency
5th hydraulic fluid port of reversal valve and the 9th hydraulic fluid port cut-off, the second executing agency, the 3rd executing agency,
5th hydraulic fluid port connection the 9th hydraulic fluid port of the reversal valve in the 4th executing agency.
One, preferably or in alternative embodiment, reversal valve can be three nine and lead to reversal valve.
Low energy consumption many executing agencies hydraulic system that the present invention provides can be applied at machines such as excavators
On tool equipment.
In the illustrative examples of the excavator that the present invention provides, excavator includes any of the above-described
Low energy consumption many executing agencies hydraulic system in embodiment.
The low energy consumption many executing agency hydraulic system applications of present invention offer is set forth below at excavator
On a specific embodiment.
As it is shown in figure 1, in this specific embodiment, the first executing agency can perform machine for swing arm
Structure, the first execution unit 13 can be boom cylinder；Second executing agency can perform for revolution
Mechanism, the second execution unit 14 can be rotary motor；3rd executing agency can hold for dipper
Row mechanism, the 3rd execution unit 15 can be bucket arm cylinder；4th executing agency can be walking
Executing agency, the 4th execution unit 16 can be running motor.And bearing in the 4th executing agency
Carry and on feedback channel, be provided with throttling shock absorbing valve 21, for being filtered disappearing to walking load pressure
Shake, reduces main pump pressure.
Load sensitive pump 1 loop in parallel respectively to boom cylinder (the first executing agency 13),
Rotary motor (the second executing agency 14), bucket arm cylinder (the 3rd executing agency 15), walking horse
Reaching (the 4th executing agency 16) fuel feeding, constant displacement pump 3 is each by flowing to after the 3rd check valve 20
Position in connection, finally by counterbalance valve 24 oil return box.
Constant displacement pump 3 is gone out by the 3rd check valve 20 and the 4th check valve 22 and load sensitive pump 1
Hydraulic fluid port carries out collaborating to supply to the rodless cavity of boom cylinder by valve post-compensators 6 and the 5th check valve 25
Oil, constant displacement pump 3 is direct to boom cylinder fuel feeding, reduces main valve energy loss；Constant displacement pump 3 leads to
Cross one-way throttle valve 5 pass through the second reversal valve 12 to rotary motor fuel feeding, load sensitive pump 1 and lead to
Overcompensation valve 11 and the 6th check valve 26 carry out collaborating to supply to rotary motor with the flow of constant displacement pump 3
Oil.Above-mentioned constant displacement pump 3 is not oily directly to the swing arm alliance of excavator by priority restriction, reduces
The pressure loss, reduces energy consumption, and constant displacement pump 3 is in parallel to rotation oil fuel feeding by a throttle orifice.
When swing arm does not works, constant displacement pump 3 passes through the 3rd check valve 20 to dipper executing agency and row
Walk executing agency's fuel feeding.
When swing arm executing agency and rotary power unit composite move, constant displacement pump 3 performs to revolution
Mechanism is answered and swing arm executing agency fuel feeding, but constant displacement pump 3 is preferential to swing arm executing agency fuel feeding, soon
Speed improves swing arm height, it is achieved coordination.When swing arm declines, the pressure of boom cylinder rod chamber
The rodless cavity flow of boom cylinder is passed through throttling control valve 4 by the opening of control throttling control valve 4
Flow to the rod chamber of boom cylinder, it is achieved swing arm flow regenerates.When swing arm does not works, constant displacement pump
3 flows providing flow to dipper executing agency by middle position and first check valve 8 of the first reversal valve 7
With walking executing agency.
When walking executing agency and rotary power unit composite move, walking pilot pressure control joint
The openings of sizes of flow control valve 10, throttling control valve 10 opens, and executing agency loses preferential interaction,
First check valve 8 is provided with 25bar pressure simultaneously, and the pressure that the first check valve 8 is arranged makes second
The inlet pressure of reversal valve increases, and improves rotary torque.Above-mentioned constant displacement pump 3 is by with pressure drop
Check valve and control choke valve to walking fuel feeding, check valve improves rotation pressure, adds back
Torque.
When rotary power unit and dipper executing agency composite move, throttling control valve 10 is closed,
The action of rotary power unit has precedence over the action of dipper executing agency.
In this system, each connection load pressure is flowed into the flow control of load sensitive pump 1 by choke valve 2
In the sensitive cavity of valve processed, responsive to load pump 1 carries out flow-control, walking connection load feedback passage
It is provided with throttling shock absorbing valve 21 for being filtered shock absorbing, reduction main pump pressure to walking load pressure
Power.
In above-mentioned specific embodiment, use constant displacement pump and load sensitive pump as excavator power source,
Constant displacement pump oil circuit in parallel to swing arm and rotation oil fuel feeding, by series loop to dipper, OK
Walk, scraper bowl loop fuel feeding.This hydraulic system has the feature of load sensitive system, simultaneous quantitative pump
System solves again the problem of load sensitive system response lag, additionally, this system uses quantitatively
Pump has the features such as simple in construction, easy care.
In describing the invention, it is to be understood that use " first ", " second ", " the 3rd "
Limit parts Deng word, it is only for be easy to distinguish above-mentioned parts, as not having
Having Stated otherwise, above-mentioned word does not has particular meaning, therefore it is not intended that protect the present invention
Protect the restriction of scope.
Finally should be noted that: above example only in order to technical scheme to be described and
Non-to its restriction；Although the present invention being described in detail with reference to preferred embodiment, affiliated
The those of ordinary skill in field is it is understood that still can enter to the detailed description of the invention of the present invention
Row is changed or carries out equivalent to portion of techniques feature；Without deviating from technical solution of the present invention
Spirit, it all should be covered in the middle of the technical scheme scope that the present invention is claimed.
Claims (20)
1. low energy consumption many executing agencies hydraulic system, it is characterised in that: include constant displacement pump (3),
Load sensitive pump (1) and several executing agency, described executing agency at least includes reversal valve, valve
Post-compensators and execution unit, described constant displacement pump (3) at least connects with a described executing agency,
Described load sensitive pump (1) and each described executing agency parallel communication；Each described executing agency
Load feedback passage parallel communication total load feedback channel, described total load feedback channel connection stream
Control valve, the described load sensitive pump (1) of described flow control valve connection is quick to described load
Sense pump (1) carries out flow-control；
At least a described executing agency meets following condition:
The hydraulic oil that described load sensitive pump (1) provides can pass sequentially through this described executing agency
In reversal valve and valve post-compensators after, with the hydraulic oil that described constant displacement pump (3) provides collaborate into
Enter the reversal valve in this described executing agency, and then be the execution unit in this described executing agency
Fuel feeding.
2. low energy consumption many executing agencies as claimed in claim 1 hydraulic system, it is characterised in that:
Described several executing agency at least includes the first executing agency and the second executing agency, described quantitatively
Pump (3) and described first executing agency and described second executing agency's parallel communication；
Described first executing agency at least includes the first reversal valve (7), the first valve post-compensators (6)
With the first execution unit (13)；Described second executing agency at least include the second reversal valve (12),
Second valve post-compensators (11) and the second execution unit (14)；
Under described first executing agency's duty: the hydraulic pressure that described load sensitive pump (1) provides
Oil can pass sequentially through described first reversal valve (7) and described first valve post-compensators (6),
Enter described first reversal valve (7) with the hydraulic oil interflow that described constant displacement pump (3) provides, enter
And it is described first execution unit (13) fuel feeding；
Under described second executing agency's duty: the hydraulic pressure that described load sensitive pump (1) provides
Oil can pass sequentially through described second reversal valve (12) and described second valve post-compensators (11),
Enter described second reversal valve (12) with the hydraulic oil interflow that described constant displacement pump (3) provides, enter
And it is described second execution unit (14) fuel feeding.
3. low energy consumption many executing agencies as claimed in claim 2 hydraulic system, it is characterised in that:
It is provided with one-way throttle valve on the oil circuit that described constant displacement pump (3) connects with described second executing agency
(5), when described first executing agency and described second executing agency's composite move, described fixed
Amount pump (3) is preferential to described first executing agency's fuel feeding.
4. low energy consumption many executing agencies as claimed in claim 3 hydraulic system, it is characterised in that:
Described first executing agency also includes first throttle control valve (4), in described first throttle control
When valve processed (4) is opened, returning of one of them actuator port of described first execution unit (13)
Oil can enter described first throttle control valve (4) by described first reversal valve (7), logical
Cross described first throttle control valve (4) and again return to described first reversal valve (7), then enter
Enter another actuator port of described first execution unit (13), it is achieved flow regenerates.
5. low energy consumption many executing agencies as claimed in claim 2 hydraulic system, it is characterised in that:
Also include the 3rd executing agency, described 3rd executing agency include the 3rd reversal valve (17),
Three valve post-compensators (19) and the 3rd execution unit (15)；Described first reversal valve (7),
When described second reversal valve (12) and described 3rd reversal valve (17) are positioned at middle position, described fixed
Amount pump (3) hydraulic oil that provides be sequentially connected in series the middle position through described first reversal valve (7),
The middle position of described second reversal valve (12) and the middle position of described 3rd reversal valve (17), flow into
Fuel tank.
6. low energy consumption many executing agencies as claimed in claim 5 hydraulic system, it is characterised in that:
Also include the 4th executing agency, described 4th executing agency include the 4th reversal valve (18),
Four valve post-compensators (23) and the 4th execution unit (16)；Described first reversal valve (7),
Described second reversal valve (12), described 3rd reversal valve (17) and described 4th reversal valve (18)
When being positioned at middle position, the hydraulic oil that described constant displacement pump (3) provides is sequentially connected in series and changes through described first
To the middle position of valve (7), the middle position of described second reversal valve (12), described 3rd reversal valve (17)
Middle position and the middle position of described 4th reversal valve (18), flow into fuel tank.
7. low energy consumption many executing agencies as claimed in claim 6 hydraulic system, it is characterised in that:
Connect in the middle position of the middle position of described first reversal valve (7) and described second reversal valve (12)
On oil circuit, side is connected to the first oil circuit, the confession of load sensitive pump (1) described in described first oil communication
Oil oil circuit, described first oil circuit is provided with the first check valve (8) and second section flow control valve
(10)。
8. low energy consumption many executing agencies as claimed in claim 7 hydraulic system, it is characterised in that:
When described second executing agency and described 4th executing agency's composite move, described second throttling control
Valve processed (10) is opened, the preferential action of described 4th executing agency, and by described first unidirectional
The unlatching pressure that valve (8) is arranged increases the inlet pressure of described second reversal valve (12).
9. low energy consumption many executing agencies as claimed in claim 7 hydraulic system, it is characterised in that:
When described second executing agency and described 3rd executing agency's composite move, described second throttling control
Valve processed (10) cuts out, the preferential action of described second executing agency.
10. low energy consumption many executing agencies as claimed in claim 7 hydraulic system, it is characterised in that:
Connect in the middle position of the middle position of described second reversal valve (12) and described 3rd reversal valve (17)
Oil circuit on other be connected to the second oil circuit, load sensitive pump (1) described in described second oil communication
Oil feeding line, described second oil circuit is provided with the second check valve (9).
11. low energy consumption many executing agencies as claimed in claim 6 hydraulic systems, it is characterised in that:
Described constant displacement pump (3) be sequentially connected in series connect described first reversal valve (7) middle position, described
The middle position of two reversal valves (12), the middle position and the described 4th of described 3rd reversal valve (17) are changed
To the middle position of valve (18), the last oil circuit connecting with fuel tank is provided with counterbalance valve (24).
12. low energy consumption many executing agencies as claimed in claim 2 hydraulic systems, its feature exists
In: the pressure oil that described constant displacement pump (3) provides is by the 3rd check valve (20) in parallel or series
Connect described executing agency, and the oil that described constant displacement pump (3) connects with described first executing agency
It is provided with the 4th check valve (22) on road.
13. low energy consumption many executing agencies as claimed in claim 1 hydraulic systems, it is characterised in that:
It is provided with choke valve (2) on described total load feedback oil circuit.
14. low energy consumption many executing agencies as claimed in claim 1 hydraulic systems, its feature exists
In: described reversal valve at least includes middle position, the first working position and the second working position, described commutation
When valve is positioned at middle position, described constant displacement pump (3) and described load sensitive pump (1) be not all to described
The corresponding described execution unit fuel feeding of reversal valve, described reversal valve is positioned at the first working position and
During two working positions, described constant displacement pump (3) and described load sensitive pump (1) all can be to described
The corresponding described execution unit fuel feeding of reversal valve.
15. low energy consumption many executing agencies as claimed in claim 14 hydraulic systems, its feature exists
In: described reversal valve is three nine and leads to reversal valve.
16. low energy consumption many executing agencies as claimed in claim 2 hydraulic systems, it is characterised in that:
Described first executing agency is swing arm executing agency, and described first execution unit (13) is swing arm
Oil cylinder, described second executing agency is rotary power unit, described second execution unit (14)
For rotary motor.
17. low energy consumption many executing agencies as claimed in claim 5 hydraulic systems, its feature exists
In: described 3rd executing agency is dipper executing agency, and described 3rd execution unit (15) is
Bucket arm cylinder.
18. low energy consumption many executing agencies as claimed in claim 6 hydraulic systems, its feature exists
In: described 4th executing agency is walking executing agency, and described 4th execution unit (16) is
Running motor.
19. low energy consumption many executing agencies as claimed in claim 18 hydraulic systems, its feature exists
In: it is provided with throttling shock absorbing valve (21) on the load feedback passage of described 4th executing agency.
20. 1 kinds of excavators, it is characterised in that: include as described in any one of claim 1-19
Low energy consumption many executing agencies hydraulic system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510084445.7A CN105987033B (en) | 2015-02-11 | 2015-02-11 | The more executing agency's hydraulic systems of low energy consumption and excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510084445.7A CN105987033B (en) | 2015-02-11 | 2015-02-11 | The more executing agency's hydraulic systems of low energy consumption and excavator |
Publications (2)
| Publication Number | Publication Date |
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| CN105987033A true CN105987033A (en) | 2016-10-05 |
| CN105987033B CN105987033B (en) | 2018-08-14 |
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ID=57038506
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510084445.7A Active CN105987033B (en) | 2015-02-11 | 2015-02-11 | The more executing agency's hydraulic systems of low energy consumption and excavator |
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| Country | Link |
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| CN (1) | CN105987033B (en) |
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| CN106759620A (en) * | 2016-12-29 | 2017-05-31 | 潍柴动力股份有限公司 | A kind of excavator synchronous control system and excavator |
| CN108483264A (en) * | 2018-06-20 | 2018-09-04 | 徐州重型机械有限公司 | The hydraulic control system and hoisting machinery of hoisting machinery |
| CN113969603A (en) * | 2021-11-29 | 2022-01-25 | 山河智能装备股份有限公司 | Excavator and liquid drive electric control system thereof |
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| Publication number | Publication date |
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| CN105987033B (en) | 2018-08-14 |
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