CN110486341A - Hydraulic control system and mobile working equipment - Google Patents
Hydraulic control system and mobile working equipment Download PDFInfo
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- CN110486341A CN110486341A CN201810454362.6A CN201810454362A CN110486341A CN 110486341 A CN110486341 A CN 110486341A CN 201810454362 A CN201810454362 A CN 201810454362A CN 110486341 A CN110486341 A CN 110486341A
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- Prior art keywords
- valve
- hydraulic
- control
- control system
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Classifications
-
- 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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more 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
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
Abstract
This application provides a kind of hydraulic control system and a kind of mobile working equipments.The hydraulic control system includes: hydraulic actuating unit, has the first hydraulic actuator for executing the first operation and the second hydraulic actuator for executing the second operation;Pilot valve is operated with the hydraulic actuating unit fluid coupling with controlling first operation and described second;And switch unit, it has the entrance coupled with the pilot fluid and the outlet with the hydraulic actuating unit fluid coupling, the switch unit is suitable for when the hydraulic control system is converted to the composition operation being made of first operation and second operation from first operation or second operation, so that the inlet pressure of the switch unit changes into the outlet pressure as predetermined pilot pressure by the switch unit.
Description
Technical field
The present invention relates to a kind of hydraulic control system and a kind of corresponding mobile working equipments.
Background technique
Compared with the other kinds of transmission device such as mechanical driving device, hydraulic transmission have it is small in size, light-weight,
Sensitive, achievable frequent starting and commutation manipulate many advantages, such as simple and easily controllable.Therefore, at present in many machines
It is widely applied in tool equipment.
In the pavement construction machineries such as loading machine, excavator, fork truck, there is apparent advantage using hydraulic control system.At this
Inside kind engineering machinery, it usually needs two or more actuators (for example, motor, oil cylinder etc.) act compound to realize together
Movement.For example, such hydraulic control system to be used for the cantilever of loading machine, to realize such as rotation or the like of cantilever
Composite move.
In existing hydraulic control system, main valve usually is set below each hydraulic actuator, for example, throttle valve,
The opening area of the spool of these main valves is adjusted by operator's pull operation handle, to control the behaviour of hydraulic actuator
Make.But even if operator is equal by pulling handle to be adjusted to the opening area of these main valves, due to each hydraulic execution
The load (for example, load of oil cylinder) of device is different, and hydraulic fluid can be flowed towards the side of low pressure, thus cannot achieve two
Or more actuator actuation together composite move.
In the prior art, to solve the above-mentioned problems, a kind of scheme is respectively set before or after each main valve
Pressure compensator, so that the opening area of spool is only dependent upon towards the distribution of the hydraulic fluid of hydraulic actuator, and no longer
Dependent on load.In this way, realizing the compound of two or more actuators by the opening area of operator's adjusting spool
Movement.But this scheme needs to increase several pressure compensators, thereby increase hydraulic control system complexity and at
This.
Therefore, a kind of improved hydraulic control system is needed to overcome the problems of the prior art.
Summary of the invention
The object of the present invention is to provide the corresponding of a kind of high efficient and reliable, the simple hydraulic control system of structure and one kind
Mobile working equipment.
According to the first aspect of the invention, a kind of hydraulic control system is provided comprising: hydraulic actuating unit,
With the first hydraulic actuator for executing the first operation and the second hydraulic actuator for executing the second operation;Guide
Valve generates control signal, to control first operation and second operation;And switch unit, have with it is described
The first flow path of first hydraulic actuator fluid coupling and second flow path with the second hydraulic actuator fluid coupling, it is described
Switch unit, which is suitable for being configured as executing in the hydraulic control system, to be made of first operation and second operation
When composition operation, under the control of said control signal, by adjusting the side in the first flow path and the second flow path
Circuit pressure adjusts the pressure of the other side flow path in the first flow path and the second flow path.
According to an optional embodiment, the hydraulic control system further includes hydraulic unit.The hydraulic work
The first main valve is included as unit, is fluidly coupled between the pilot valve and first hydraulic actuator, the pilot valve
The first operation of first hydraulic actuator is controlled by adjusting first main valve;And second main valve, fluid coupling
It closes between the pilot valve and second hydraulic actuator, the pilot valve is by adjusting second main valve to control
State the second operation of the second hydraulic actuator.
According to an optional embodiment, the first flow path limits the first input port and of the switch unit
One output port.The first input port and the first control port of the pilot valve couple, and first output end
The side guide end of mouth and the first main valve of the hydraulic control system couples.The second flow path limits the switch unit
Second input port and second output terminal mouth.Second control port of second input port and the pilot valve couples, and
And the side guide end of the second output terminal mouth and the second main valve of the hydraulic control system couples.
According to an optional embodiment, the first of the side guide end of first main valve and the switch unit is defeated
Exit port fluid coupling, and the third control port fluid coupling at the other side guide end of first main valve and the pilot valve
It closes.The side guide end of second main valve and the second output terminal mouth fluid coupling of the switch unit, and described second
The other side guide end of main valve and the 4th control port fluid coupling of the pilot valve.
According to an optional embodiment, the switch unit includes: first throttle valve, is had and the pilot valve
The first control port fluid coupling entrance and outlet with the side guide end fluid coupling of first main valve;Second
Throttle valve has the fuel tank with the entrance of the outlet fluid coupling of the first throttle valve and with the hydraulic control system
The outlet of fluid coupling;And switch, have with the arrival end of the outlet connection of the second throttle, with the fuel tank and connects
The outlet end connect and the control terminal being connect with the second control port of the pilot valve,
Wherein, the switch is suitable for opening under the control of the control signal from second control port, with
So that the pilot fluid in the pilot fluid source from the hydraulic control system is via the first throttle valve, second throttling
Valve and the switch flow into the fuel tank, to be adjusted by the pressure for the first-class trackside for reducing the switch unit described
The pressure of second trackside.
According to an optional embodiment, the switch is one of check valve or hydraulic valve, the control signal
It is the hydraulic pressure signal from second control port.
According to an optional embodiment, the switch is solenoid valve, and the control signal is based on from described the
The electric signal of the hydraulic pressure signal of two control ports.
According to an optional embodiment, the switch is overflow valve, and the overflow valve is configured as receiving
It is opened when from the hydraulic pressure signal of second control port, to be connected to the fuel tank.
According to an optional embodiment, the switch unit includes: pressure reducing valve, is had and the switch unit
The arrival end of first input port connection, the outlet end that is connect with the first output port of the switch unit and with the elder generation
The control terminal of the second control port connection of pilot valve.The pressure reducing valve is in the control signal from second control port
Control under open so that the pilot fluid in the pilot fluid source from the hydraulic control system flows through the pressure reducing valve,
To adjust the second flow path lateral pressure by the pressure for the first-class trackside for reducing the switch unit.
According to an optional embodiment, the switch unit includes: first throttle valve, is had and the pilot valve
The first control port fluid coupling entrance and outlet with the side guide end fluid coupling of first main valve;And
Overflow valve, have with the arrival end of the outlet connection of the first throttle valve, the outlet end that is connect with the fuel tank and with institute
State the control terminal of the second control port connection of pilot valve.The overflow valve is suitable for from described in second control port
It controls and is opened under the control of signal, so that the pilot fluid in the pilot fluid source from the hydraulic control system is via described
First throttle valve and the overflow valve flow into the fuel tank, to pass through the pressure for the first-class trackside for reducing the switch unit
To adjust the second flow path lateral pressure.
According to the second aspect of the invention, a kind of mobile working equipment is provided, the movable type working equipment is matched
Have the hydraulic control system.
According to an optional embodiment, the movable type working equipment is loading machine, excavator or fork truck.
Hydraulic control system configuration of the invention is simple, high reliablity, while can be realized mechanical composite move.
Detailed description of the invention
In the following, by the way that referring to attached drawing, the present invention will be described in more detail, may be better understood the principle of the present invention, feature and
Advantage.Attached drawing includes:
Fig. 1 shows the system block diagram of the hydraulic control system of an exemplary embodiment according to the present invention.
Fig. 2A-Fig. 2 D is the schematic diagram of the switch unit of the hydraulic control system of a variety of implementations according to the present invention.
Specific embodiment
In order to keep the technical problems to be solved by the invention, technical solution and beneficial technical effect more clear bright
White, below with reference to attached drawing and multiple embodiments, the present invention will be described in further detail.It should be appreciated that described herein
The specific embodiments are only for explaining the present invention, rather than for limiting the scope of protection of the present invention.
Fig. 1 shows the block diagram of the hydraulic control system of an exemplary embodiment according to the present invention.As shown in Figure 1,
Hydraulic control system 100 specifically include that hydraulic actuating unit 110, with the pilot valve 120 of 110 fluid coupling of hydraulic actuating unit,
And it is fluidly coupled to switch unit 130 between hydraulic actuating unit 110 and pilot valve 120.It is shown in FIG. 1 and hydraulic executes list
Member 110 includes two hydraulic actuators, that is, the first hydraulic actuator 111 and the second hydraulic actuator 112.First hydraulic execution
Device 111 executes the first operation under the control of pilot valve 120.Second hydraulic actuator 112 executes under the control of pilot valve 120
Second operation.Second operation one performed by first operation performed by first hydraulic execution 111 and the second hydraulic actuator 112
Actuation is played with the composite move of the pavement construction machinery of the composite move, such as excavator that constitute machine etc.It should be appreciated that hydraulic hold
Row unit 110 can also be according to concrete application and including more than two any number of hydraulic actuator.These hydraulic execution
Device is acted together to realize composite move.In Fig. 1, the first hydraulic actuator 111 and the second hydraulic actuator 112 are all illustrated
For hydraulic cylinder, it should be understood that they are also possible to the hydraulic actuator of other forms, for example, motor etc..In Fig. 1, the second liquid
Pressure actuator 112 is illustrated as two hydraulic cylinder 112A and 112B in parallel.It should be appreciated that the first hydraulic actuator 111 and second
Hydraulic actuator 112 can otherwise be configured according to concrete application.
Pilot valve 120 is preferentially configured to operation handle.Operator is hydraulic to adjust by the direction for adjusting operation handle
First operation of actuator 111 and the second operation of hydraulic actuator 112.Pilot valve 120 has first as control port
Control port a1, the second control port b2, third control port b1 and the 4th control port a2.Referring to Fig. 1, pilot valve 120 is also
With port P, coupled with the pilot fluid source (not shown) of hydraulic control system 100.Pilot valve 120 passes through port P as a result,
Pilot fluid is received from pilot fluid source.
With continued reference to Fig. 1, hydraulic control system 100 further includes hydraulic unit 140, mainly includes the first main valve
141 and second main valve 142.First main valve 141 is fluidly coupled between pilot valve 120 and the first hydraulic actuator 111.Pilot valve
120 control the first operation of the first hydraulic actuator 111 by adjusting the first main valve 141.Second main valve 142 is fluidly coupled to
Between pilot valve 120 and the second hydraulic actuator 142.Pilot valve 120 hydraulic is held by adjusting the second main valve 142 to control second
Second operation of row device 112.Hydraulic unit 140 has output port A1, B1, A2, B2, they are connected to corresponding hydraulic
Actuator 111 and 112.
Switch unit 130 is coupled between pilot valve 120 and hydraulic unit 140.As shown in Figure 1, switch unit 130
With first flow path (a1 '-a11 ') and second flow path (b2 '-b22 ').First flow path (a1 '-a11 ') limits switch unit
(130) first input port a1 ' and the first output port a11 '.Second flow path (b2 '-b22 ') limits switch unit (130)
The second input port b2 ' and second output terminal mouth b22 '.The first control port of first input port a1 ' and pilot valve 120
A1 coupling.Second control port b2 of the second input port b2 ' and pilot valve 120 is coupled.First output port a11 ' and first
The side guide end 141A of main valve 141 is coupled.The side guide end 142A coupling of second output terminal mouth b22 ' and the second main valve 142
It connects.
In hydraulic control system 100, pilot fluid (for example, guide oil) is successively flowed from pilot fluid source via port P
The side guide end 141A of the first main valve 141 through switch unit 130 and hydraulic unit 140 and/or the second main valve 142
It is main to adjust the first main valve 141 and/or second to push the first main valve 141 and/or the second main valve 142 by side guide end 142A
The pilot pressure of valve 142, to control the operation of hydraulic actuator 111 and 112.
According to some embodiments of the present invention, as shown in Figure 1, switch unit 130 includes first throttle valve 131, the second section
Flow valve 132 and check valve 133.First throttle valve 131 has to be entered with the first control port a1 fluid coupling of pilot valve 120
Mouth and the outlet with the side guide end 141A fluid coupling of the first main valve 141.Second throttle 132 has and first throttle
The entrance of the outlet fluid coupling of valve 131 and outlet with the fuel tank T fluid coupling of hydraulic control system 100.Check valve 133 has
Have with the arrival end of the outlet connection of second throttle 132, controlled with the outlet end connecting fuel tank T and with the second of pilot valve 120
The control terminal of b2 connection in port processed.
Below by taking hydraulic control system 100 and its switch unit 130 of the invention as an example, illustrate the elder generation by adjusting main valve
Pilot power realizes the process of the composite move of hydraulic actuating unit 110.In the following embodiments, it is assumed that the first hydraulic execution
Device 111 is for example with the first load, and the second hydraulic actuator 112 is for example with the second load for being greater than the first load.It should manage
Solution, the load of the first actuator 111 and the second actuator 112 can be other situations, without being limited thereto.
In some embodiments, firstly, the first control port a1 of operated pilot valve 120, so that pilot fluid passes through end
Mouth P flows through the first input port a1 ' of switch unit 130, via fluid path (for example, first flow path of switch unit 130)
A1 '-a11 ' flow to the guide end 141A of the first main valve 141, to push the guide end 141A of the first main valve 141, to control
First operation of the first hydraulic actuator 111.At this moment, the side movement of only the first hydraulic actuator 111, that is to say, that liquid
Pressure execution unit 110 only executes the first operation.Then, the second control port b2 of operated pilot valve 120, so that pilot fluid passes through
The second input port b2 ' of switch unit 130 is flow to by port P.Check valve 133 is in the hydraulic letter from the second control port b2
Number control under open so that pilot fluid successively via first throttle valve 131, second throttle 132 and check valve 133 flow into
Fuel tank T.The outlet pressure of first output port a11 ' of switch unit 130 as a result, i.e. the guide end 141A of the first main valve 141
Pilot pressure be lowered, such as be reduced to predetermined pilot pressure.Here, the predetermined elder generation of the guide end 141A of the first main valve 141
Pilot power can be arranged according to the desired composite move of the hydraulic actuator 111,112 of two sides.In this way, the first main valve 141
Spool on power reduce, mobile distance shortens, and causes its opening area to become smaller, to have adjusted the first hydraulic actuator
The flow of 111 this side.
Therefore, two sides hydraulic actuator 111,112 is being converted to from the first operation for only executing the first hydraulic actuator 111
When being carried out the composition operation of operation, the pilot pressure of main valve is adjusted by pilot fluid, so that the first actuator 111 and
Hydraulic fluid can be all supplied in two actuators, 112 two sides.Further, it is possible to adjust two by the predetermined pilot pressure for setting main valve
The flow of side hydraulic actuator, to realize desired composite move.
In some embodiments, firstly, the second control port b2 of operated pilot valve 120 is with to the of switch unit 130
Two input port b2 ' supply pilot fluid.At this moment, control of the check valve 133 in the hydraulic pressure signal from the second control port b2
Lower unlatching, so that pilot fluid flows into fuel tank T followed by first throttle valve 131, second throttle 132 and check valve 133.
The outlet pressure of first output port a11 ' of switch unit 130 as a result, the i.e. guide of the guide end 141A of the first main valve 141
Pressure is lowered, such as is reduced to predetermined pilot pressure.Here, the predetermined pilot pressure of the guide end 141A of the first main valve 141
It can be arranged according to the desired composite move of the hydraulic actuator 111,112 of two sides.At this moment, only the second hydraulic actuator
112 side movement, that is to say, that hydraulic actuating unit 110 only executes the second operation.Then, the first of operated pilot valve 120
Control port a1, with to the first input port a1 ' feed flow of switch unit 130, in the outlet pressure of the first output port a11 '
In the case where being lowered, pilot fluid can flow through fluid path the a1 '-a11 ' of switch unit 130, while also flow through switch
Fluid path the b2 '-b22 ' (for example, second flow path of switch unit 130) of unit 130, thus two sides hydraulic actuator 111,
112 can all be supplied hydraulic fluid, to realize composite move.
Therefore, two sides hydraulic actuator 111,112 is being converted to from the second operation for only executing the second hydraulic actuator 112
When being carried out the composition operation of operation, the pilot pressure of main valve is adjusted by pilot fluid, so that the first actuator 111 and
Hydraulic fluid can be all supplied in two actuators, 112 two sides.Further, it is possible to adjust two by the predetermined pilot pressure for setting main valve
The flow of side hydraulic actuator, to realize desired composite move.
From above description as it can be seen that the switch unit of hydraulic control system of the invention is suitable in the control from pilot valve
It is opened under the control of signal, so that pilot fluid flows through switch unit, so that the inlet pressure of switch unit passes through pilot fluid
Change via the switch unit in exit, for example, the outlet pressure of switch unit changes into the predetermined pilot pressure of main valve,
To realize the composite move of hydraulic actuating unit.According to the technique and scheme of the present invention, additionally it is possible to by the guide for setting main valve
Pressure adjusts the flow of hydraulic actuator, to realize the desired composite move of hydraulic actuating unit.
It should be appreciated that hydraulic actuating unit may include more than two hydraulic in hydraulic control system of the invention
Actuator, hydraulic unit also may include more than two main valves, and the quantity of the quantity of main valve and hydraulic actuator
Accordingly.In the case where including more than two hydraulic actuators and main valve, to the pilot valve of hydraulic control system of the invention
With the configuration mode of switch unit adaptive change is carried out, equally can be realized the actuation together of multiple actuators according to the present invention
Composite move.
Fig. 2A-Fig. 2 D is the schematic diagram of the modification of the switch unit 130 in Fig. 1.Switch unit shown in Fig. 2A-Fig. 2 D
130A-130D can replace the switch unit 130 in Fig. 1, to realize hydraulic control system 100 according to the present invention.Certainly,
There are also other implementations for switch unit 130 of the invention, without being limited thereto.Hereinafter, to the switch unit in Fig. 2A-Fig. 2 D
130A-130D is illustrated respectively.
Fig. 2A is showing for the switch unit 130A of an exemplary embodiment of hydraulic control system 100 according to the present invention
It is intended to.Switch unit 130A shown in Fig. 2A the difference is that only with switch unit 130 shown in FIG. 1, by the list in Fig. 1
It replaces to valve 133 for solenoid valve 133A shown in Fig. 2A.The connection type and working method and switch of switch unit 130A
Unit 130 is identical, herein for the sake of removing, repeats no more.The control signal of solenoid valve 133A is electric signal, based on next
From the control signal of the second control port b2 of pilot valve 120.For example, the second control port b2 of pilot valve 120 is by being suitble to
Signal adapter connect with the control terminal of solenoid valve 133A, the control terminal of solenoid valve 133A is received by the converter from first
The control signal of pilot valve 120.
Fig. 2 B is showing for the switch unit 130B of an exemplary embodiment of hydraulic control system 100 according to the present invention
It is intended to.Switch unit 130B shown in Fig. 2 B the difference is that only with switch unit 130 shown in FIG. 1, by the list in Fig. 1
It replaces to valve 133 for overflow valve 133B shown in Fig. 2 B.The connection type and working method and switch of switch unit 130B
Unit 130 is identical, herein for the sake of removing, repeats no more.It should be noted that overflow valve 133B here is that have control
The overflow valve of port.For example, when the control terminal of overflow valve 133B receives the control of the second control port b2 from pilot valve 120
When signal processed, overflow valve 133B inlet pressure is set as 0, i.e. overflow valve 133B is directly connected to fuel tank T.
Fig. 2 C shows the variant 130C of the switch unit 130B in Fig. 2 B.Switch unit 130C shown in fig. 2 C with
Switch unit 130B's shown in Fig. 2 B the difference is that only, the switch unit in switch unit 130C ratio Fig. 2 B in Fig. 2 C
130B lacks a throttle valve, i.e. switch unit 130C in Fig. 2 C includes first throttle valve 131 and overflow valve 133C.It should manage
Solution, in the variant of switch unit 130C, switch unit 130C also can be omitted first throttle valve 131, i.e., only includes overflowing
Flow valve 133C.In switch unit 130C and its variant, when the control terminal of overflow valve 133C is received from pilot valve
When the control signal of 120 the second control port b2, its inlet pressure level is set, for example, the guide end 141A's of main valve 141 is pre-
Determine pilot pressure or other suitable pressure values.
Fig. 2 D is showing for the switch unit 130D of an exemplary embodiment of hydraulic control system 100 according to the present invention
It is intended to.As shown in Figure 2 D, switch unit 130D includes pressure reducing valve 133D.Pressure reducing valve 133D has first with switch unit 130D
The arrival end of arrival end a1 ' connection, with the outlet end connecting the first exit end a11 ' of switch unit 130D and and pilot valve
The control terminal of 120 the second control port b2 connection.When the control terminal of pressure reducing valve 133D is received from the second control port b2
Hydraulic pressure signal when, pressure reducing valve 130D open, so that pilot fluid flows through pressure reducing valve 133D, so that the first of switch unit 130D
The outlet pressure of output port a11 ', the i.e. pilot pressure of the guide end 141A of the first main valve 141 are reduced, such as are reduced to pre-
Determine pilot pressure value.
From above description as it can be seen that hydraulic control system of the invention includes additional switch unit, with pilot valve (example
Such as, operation handle) cooperate to adjust the pilot pressure of the main valve of hydraulic control system, to adjust the flow of hydraulic actuator, from
And the composite move of multiple actuators is realized, and hydraulic control system configuration of the invention is simple, high reliablity, it is easy to grasp
Make.
It is obvious to a person skilled in the art, that hydraulic control system of the invention can also be applied to other needs
Equipment of the hydraulic control system, such as fork truck, excavator etc., are not limited solely to loading machine.
Moreover, for a person skilled in the art, other advantages of the invention and alternative embodiment be it is aobvious and
It is clear to.Therefore, it is tied shown in the present invention is not limited to for its wider range of meaning with the detail, representativeness
Structure and exemplary embodiment.On the contrary, those skilled in the art can be in the feelings for not departing from essence spirit and range of the invention
It carry out various modifications and substitutes under condition.
Claims (12)
1. a kind of hydraulic control system (100), which is characterized in that the hydraulic control system (100) includes:
Hydraulic actuating unit (110) has the first hydraulic actuator (111) for executing the first operation and for execution the
The second hydraulic actuator (112) of two operations;
Pilot valve (120) generates control signal, to control first operation and second operation;And
Switch unit (130) has with the first flow path of the first hydraulic actuator (111) fluid coupling and with described the
The second flow path of two hydraulic actuators (112) fluid coupling, the switch unit (130) are suitable in the hydraulic control system
(100) when being configured as executing the composition operation being made of first operation and second operation, in the control signal
Control under, adjust the first flow path by adjusting the side circuit pressure in the first flow path and the second flow path
With the pressure of the other side flow path in the second flow path.
2. hydraulic control system (100) according to claim 1, which is characterized in that the hydraulic control system (100) is also
Including hydraulic unit (140), the hydraulic unit (140) is included
First main valve (141) is fluidly coupled between the pilot valve (120) and first hydraulic actuator (111), institute
State pilot valve (120) and control by adjusting first main valve (141) the first behaviour of first hydraulic actuator (111)
Make;And
Second main valve (142) is fluidly coupled between the pilot valve (120) and second hydraulic actuator (112), institute
State pilot valve (120) and control by adjusting second main valve (142) the second behaviour of second hydraulic actuator (112)
Make.
3. hydraulic control system (100) according to claim 1 or 2, which is characterized in that
The first flow path limits the first input port (a1 ') and the first output port (a11 ') of the switch unit (130),
Wherein, the first control port (a1) of the first input port (a1 ') and the pilot valve (120) couples, and described the
The side guide end (141A) of one output port (a11 ') and first main valve (141) of the hydraulic control system (100) couples;
The second flow path limits the second input port (b2 ') and second output terminal mouth (b22 ') of the switch unit (130),
Wherein the second control port (b2) of second input port (b2 ') and the pilot valve (120) couples, and described second
The side guide end (142A) of output port (b22 ') and second main valve (142) of the hydraulic control system (100) couples.
4. hydraulic control system (100) according to claim 2 or 3, which is characterized in that
The side guide end (141A) of first main valve (141) and first output port of the switch unit (130)
(a11 ') fluid coupling, and the third control port at the other side guide end of first main valve and the pilot valve (120)
(b1) fluid coupling;
The side guide end (142A) of second main valve (142) and the second output terminal mouth of the switch unit (130)
(b22 ') fluid coupling, and the 4th control at the other side guide end of second main valve (142) and the pilot valve (120)
Port (a2) fluid coupling.
5. according to hydraulic control system described in any one of claim 2-4 (100), which is characterized in that the switch unit
(130) include:
First throttle valve (131), have with the entrance of the first control port (a1) fluid coupling of the pilot valve (120),
With the outlet of side guide end (141A) fluid coupling with first main valve (141);
Second throttle (132), have with the entrance of the outlet fluid coupling of the first throttle valve (131) and with it is described
The outlet of fuel tank (T) fluid coupling of hydraulic control system (100);And
It switchs (133), has with the arrival end of the outlet connection of the second throttle (132), with the fuel tank (T) and connect
Outlet end and the control terminal that is connect with the second control port of the pilot valve (120),
Wherein, the switch (133) is suitable for opening under the control of the control signal from second control port (b2)
It opens, so that the pilot fluid in the pilot fluid source from the hydraulic control system (100) is via the first throttle valve
(131), the second throttle (132) and the switch (133) flow into the fuel tank (T), thus by reducing the switch
The pressure of the first-class trackside of unit (130) adjusts the pressure of the second trackside.
6. hydraulic control system (100) according to claim 5, which is characterized in that the switch (133) is check valve or liquid
One of pressure valve, the control signal is the hydraulic pressure signal from second control port (b2).
7. hydraulic control system (100) according to claim 5, which is characterized in that the switch (133) is solenoid valve
(133A), the control signal is the electric signal based on the hydraulic pressure signal from second control port (b2).
8. hydraulic control system (100) according to claim 5, which is characterized in that the switch (133) is overflow valve
(133B), the overflow valve (133B) are configured as opening when receiving the control signal from second control port (b2)
It opens, to be connected to the fuel tank (T).
9. according to hydraulic control system described in any one of claim 2-4 (100), which is characterized in that the switch unit
(130) include:
Pressure reducing valve (133D), have connect with the first input port (a1 ') of the switch unit (130) arrival end, and
The outlet end that the first output port (a11 ') of the switch unit (130) connects and the second control with the pilot valve (120)
The control terminal of port (b2) connection processed,
Wherein, the pressure reducing valve (133D) is opened under the control of the control signal from second control port (b2)
It opens, so that the pilot fluid in the pilot fluid source from the hydraulic control system (100) flows through the pressure reducing valve (133D),
To adjust the pressure of the second trackside by the pressure for the first-class trackside for reducing the switch unit (130D).
10. according to hydraulic control system described in any one of claim 2-4 (100), which is characterized in that the switch unit
(130) include:
First throttle valve (131), have with the entrance of the first control port (a1) fluid coupling of the pilot valve (120),
With the outlet of side guide end (141AA) fluid coupling with first main valve (141);And
Overflow valve (133C) has arrival end and the fuel tank (T) with the outlet connection of the first throttle valve (131)
The outlet end of connection and the control terminal being connect with the second control port (b2) of the pilot valve (120),
Wherein, the overflow valve (133C) is suitable under the control of the control signal from second control port (b2)
It opens, so that the pilot fluid in the pilot fluid source from the hydraulic control system (100) is via the first throttle valve
(131) and the overflow valve (133C) flows into the fuel tank (T), thus by reducing the first-class of the switch unit (130C)
The pressure of trackside adjusts the pressure of the second trackside.
11. a kind of movable type working equipment, which is characterized in that the movable type working equipment is appointed equipped in claim 1-10
Hydraulic control system (100) described in one.
12. movable type working equipment according to claim 11, which is characterized in that the movable type working equipment is to load
Machine, excavator or fork truck.
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Cited By (1)
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CN111536094A (en) * | 2020-05-15 | 2020-08-14 | 三一重机有限公司 | Landing leg control mechanism and engineering vehicle |
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