CN208123138U - Hydraulic control system and corresponding mobile working equipment - Google Patents
Hydraulic control system and corresponding mobile working equipment Download PDFInfo
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- CN208123138U CN208123138U CN201721219420.4U CN201721219420U CN208123138U CN 208123138 U CN208123138 U CN 208123138U CN 201721219420 U CN201721219420 U CN 201721219420U CN 208123138 U CN208123138 U CN 208123138U
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Abstract
A kind of hydraulic control system includes：First hydraulic actuator；At least one second hydraulic actuator with oil inlet and feedback port；As the pressure flow hybrid control variable pump of the first pump, with variable pump discharge and flow control mouth；Second pump, outlet are hydraulically connected to oil inlet by check valve；And logic control hydraulic subsystem, it includes at least 2/2 proportioning valve, flow controller and relief valve, first hydraulic port hydraulic connecting of 2/2 proportioning valve is between the second pump discharge and check valve, second hydraulic port is hydraulically connected to oil return line, first control port is hydraulically connected between check valve and oil inlet or the first hydraulic connecting point, second control port is hydraulically connected to feedback port or the second hydraulic connecting point by flow controller, the predetermined displacement condition pumped based on the pressure differential detection first between first and second hydraulic connecting point, one end hydraulic connecting of relief valve is between the second control port and flow controller, the other end is hydraulically connected to oil return line.Reliably, comfort is good.
Description
Technical field
The utility model 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.
Especially in loading machine, excavator, fork truck etc., there is more obvious advantage using hydraulic control system.At this
In kind hydraulic control system, two hydraulic pumps in parallel are usually provided with, to reduce restriction loss and spill losses.Preferably wherein
One is the gear pump with fixed displacement, another is variable pump.These pumps can convey hydraulic to multiple hydraulic actuators
Oil.Hydraulic actuator for example including running driving device, the hydraulic cylinder of hydraulic arm and for adjusting driving direction steering dress
It sets.
For reasons such as safety, each hydraulic actuator has different priority levels.For example, transfer must be preferential
It is supplied to hydraulic oil in other hydraulic actuators, to make vehicle that can keep turning under any circumstance.
However, in current hydraulic control system, comfort when still remaining operator's operation is poor, fuel efficiency
The problems such as low.For this reason, it may be necessary to which existing hydraulic control system is further improved.
Utility model content
The purpose of the utility model is to provide a kind of high efficient and reliable, structure is simple, the better hydraulic control of operating comfort
System and a kind of corresponding mobile working equipment.
It is according to the present utility model in a first aspect, provide a kind of hydraulic control system, including：First hydraulic actuator；
At least one second hydraulic actuator, the feedback with oil inlet and the load state suitable for feeding back the second hydraulic actuator
Mouthful；As the pressure flow hybrid control variable pump of the first pump, with variable pump discharge and flow control mouth；Second pump, outlet
Only allow hydraulic oil to pump from second to second by the oil inlet that check valve is hydraulically connected to the second hydraulic actuator hydraulic to hold
The flowing of row device；And the logic control hydraulic subsystem for controlling the first hydraulic actuator and/or the second hydraulic actuator,
Including at least 2/2 proportioning valve, flow controller and relief valve, wherein 2/2 proportioning valve have the first hydraulic port, the second hydraulic port,
First control port and the second control port, between the outlet that the first hydraulic port hydraulic connecting is pumped second and check valve,
Second hydraulic port is hydraulically connected to oil return line, and the first control port hydraulic connecting is in check valve and the second hydraulic actuator
Between oil inlet or it is hydraulically connected to the first hydraulic connecting point, it is hydraulic that the second control port by flow controller is hydraulically connected to second
The feedback port of actuator is hydraulically connected to the second hydraulic connecting point, based on the first hydraulic connecting point and the second hydraulic connecting point it
Between pressure difference be adapted to detect for the predetermined displacement condition of pressure flow hybrid control variable pump, one end hydraulic connecting of relief valve is second
Between control port and flow controller, the other end is hydraulically connected to oil return line.
Alternative embodiment according to the present utility model, the hydraulic control system further include pressure-gradient control valve, the pressure-gradient control valve tool
There are entrance, first outlet and second outlet, wherein the variable pump discharge is connect with the inlet pressure of the pressure-gradient control valve, institute
State the first outlet of pressure-gradient control valve and the oil inlet hydraulic connecting of the first hydraulic actuator, the hydraulic company of the second outlet of the pressure-gradient control valve
It is connected to the oil inlet of the second hydraulic actuator；And the logic control hydraulic subsystem further includes shuttle valve, the first of shuttle valve enters
Oral fluid pressure is connected between the feedback port or the second hydraulic connecting point of flow controller and the second hydraulic actuator, the second entrance of shuttle valve
It is hydraulically connected to the feedback port of the load state for being suitable for feeding back the first hydraulic actuator of the first hydraulic actuator, the outlet of shuttle valve
It is hydraulically connected to flow control mouth.
Alternative embodiment according to the present utility model, the first hydraulic connecting point are entering for variable pump discharge or pressure-gradient control valve
Mouthful；And/or the second hydraulic connecting point is the second outlet of flow control mouth or pressure-gradient control valve；And/or the pre- fixed displacement shape
State is maximum pump discharge state.
Alternative embodiment according to the present utility model, second pump is variable pump；And/or it is supplied to the first hydraulic actuator
The hydraulic system of oil and the hydraulic system hydraulic pressure separating each other to the second hydraulic actuator fuel feeding.
Second aspect according to the present utility model provides a kind of mobile working equipment, the movable type working equipment
Equipped with the hydraulic control system.
The hydraulic control system configuration of the utility model is simple, high reliablity, operating comfort are good, while can be avoided section
Stream loss and spill losses.
Detailed description of the invention
In the following, the original of the utility model may be better understood by the way that the utility model is more fully described referring to attached drawing
Reason, features and advantages.Attached drawing includes：
Fig. 1 is the hydraulic control system for being illustrated an exemplary embodiment according to the present utility model with loading machine
System block diagram.
Specific embodiment
In order to keep technical problem to be solved in the utility model, technical solution and beneficial technical effect clearer
Understand, below with reference to attached drawing and multiple embodiments, the present invention will be further described in detail.It should be appreciated that herein
Described specific embodiment is only used for explaining the utility model, rather than for limiting the protection scope of the utility model.
Fig. 1 is the hydraulic control system for being illustrated an exemplary embodiment according to the present utility model with loading machine
System block diagram.
As shown in Figure 1, the hydraulic control system of loading machine mainly includes：Load-sensitive pressure flow hybrid control variable pump 1 turns
To unit 2, the fixed capacity pumps 3 of preferably gear pump, pressure-gradient control valve 4, pilot valve 5, at least one hydraulic unit 6 and patrol
Collect control hydraulic subsystem 7.The steering unit 2 is used to adjust the driving direction of loading machine.At least one described hydraulic
Unit 6 for example can be the hydraulic cylinder on the cantilever of loading machine.Obviously, the quantity of at least one hydraulic unit 6 and
Type is unrestricted, but can be any quantity and any appropriate type.Steering unit 2 and hydraulic unit 6 are practical
On be hydraulic actuator.
The steering unit 2 includes switching valve 21.The switching valve 21 tool there are two steering cylinder interface 22,23, they with
Two steering cylinders 24,25 connect, and steering is realized using the steering cylinder.The switching valve 21 also has pump interface 26, oil return
Mouth 27 and feedback port 28.The oil return opening 27 leads to fuel tank 8, and pump interface 26 is connect with the first outlet 41 of pressure-gradient control valve 4, feedback port
28 connect with the feedback port 42 of the first port 71 of logic control hydraulic subsystem 7 and pressure-gradient control valve 4.
Preferably, the switching valve 21 closes middle position.When steering unit 2 is operated, feedback port 28 connects with steering cylinder
22,23 hydraulic connectings of mouth.When steering unit 2 is not operated, feedback port 28 is connect with oil return opening 27.
Other than the first outlet 41 and feedback port 42 mentioned above arrived, the pressure-gradient control valve 4 also has second outlet 43
With entrance 44.Second outlet 43 is connected to the oil inlet 62 of the main control valve 61 of the hydraulic unit 6, and entrance 44 is connected to negative
Carry the outlet 101 of sensitive pressure flow control variable pump 1.In the state that pressure-gradient control valve 4 is not by fuel feeding, the valve of the pressure-gradient control valve 4
Core is maintained at first position by spring 45.In the first position, the entrance 44 is connected to first outlet 41, second outlet 43
Cut-off.Feedback pressure is applied with by feedback port 42 in the spring side of spool, is applied with first outlet 41 in the opposite side of spring
The pressure at place.The pretightning force of the spring 45 corresponds to a preferential pressure difference, can be adjusted to such as 15bar.If first
The difference of the feedback pressure at the pressure and feedback port 42 at 41 predetermined value higher than the preferential pressure difference is exported, then spool is to
Two positions are mobile.In this case, entrance 44 is connected to second outlet 43, the access quilt between entrance 44 and first outlet 41
Slightly throttling (but not being closed, to guarantee to be interrupted in no instance to the hydraulic pressure supply of steering unit 2).
Fixed capacity pumps 3 have constant discharge capacity (flow).It is hydraulic that the outlet 31 of fixed capacity pumps 3 is connected to logic control
The second port 72 of subsystem 7.Fixed capacity pumps 3 are hydraulic via logic control from fuel tank 8 by hydraulic oil under predetermined circumstances
Subsystem 7 is conveyed to hydraulic unit 6, is not conveyed under any circumstance to steering unit 2.
Load-sensitive pressure flow hybrid control variable pump 1 has the flow of continuously adjustable, and can for example be implemented as swash plate
Formula pump.The flow of load-sensitive pressure flow hybrid control variable pump 1 is adjusted using adjusting cylinder 102 and kicker cylinder 103.The backhaul
Cylinder 103 is connect with the outlet 101 of load-sensitive pressure flow hybrid control variable pump 1.In this case, once load-sensitive pressure
The rotation of 1 driven device (not shown) of flow control variable pump, then load-sensitive pressure flow hybrid control variable pump 1 will be towards maximum
Direction of the traffic (maximum pendulum angle) it is mobile.It is additionally provided with spring in the kicker cylinder 103, therefore, even if load-sensitive pressure flow
Control variable pump 1 does not rotate, and is also adjustable out maximum stream flow.
The adjusting cylinder 102 acts in the opposite manner with kicker cylinder 103, is intended to make load-sensitive pressure flow control
The flow-reduction (pivot angle reduction) of variable pump 1 processed.The adjusting cylinder 102 is caused by the first regulating valve 104 and the second regulating valve 105
It is dynamic.First regulating valve 104 is extruded in first position by preferably manually adjustable spring 106.In the first position, the adjusting
Cylinder 102 is connect with fuel tank 8 and the second regulating valve 105.In the opposite side of spring 106, load-sensitive pressure flow hybrid control variable pump 1
Output pressure be applied in the first regulating valve 104, thus can be mobile by the first regulating valve 104 under sufficiently high output pressure
To the second position.In the second position, the adjusting cylinder 102 is supported the pressurization of sensitive pressure flow control variable pump 1.Work as load
When the output pressure of sensitive pressure flow control variable pump 1 is higher than the pressure value that spring 106 is set, load-sensitive pressure flow control
Variable pump 1 processed will be conditioned towards reduced direction of the traffic, and then can limit load-sensitive pressure flow hybrid control variable pump 1
Output pressure the upper limit.
Second regulating valve 105 is extruded in first position by spring 107.At the first position, the adjusting cylinder 102 via
First regulating valve 104 is connect with fuel tank 8.In the spring opposite side of the second regulating valve 105, load-sensitive pressure flow hybrid control variable pump
1 output pressure is applied in the second regulating valve 105, to can move the second regulating valve 105 under sufficiently high output pressure
It moves to the second position.In the second position, the adjusting cylinder 102 is supported sensitive pressure flow control by the first regulating valve 104
Variable pump 1 processed pressurizes.The flow control connecting with the third port 73 of logic control hydraulic subsystem 7 is additionally provided in 107 side of spring
Donsole 108.To the output pressure of load-sensitive pressure flow hybrid control variable pump 1 and the difference of the pressure at flow control mouth 108
It is smaller, it is just mobile towards the direction for increasing flow to adjust cylinder 102.
Pilot valve 5 is preferably constructed in operation handle.Port a1, b1, a2, b2 of pilot valve 5 respectively with hydraulic list
Port a1, b1, a2, b2 connection of member 6.
Hydraulic unit 6 also has output port A1, B1, A2, B2, they be connected to corresponding hydraulic cylinder 63,64,
65, to control the operation of hydraulic cylinder.
The hydraulic control system of loading machine further includes guide's oil strainer 9 and guide oil supply valve 10, wherein guide oil mistake
One end of filter 9 is connected to the outlet 101 of load-sensitive pressure flow hybrid control variable pump 1, and the other end is connected to guide oil supply
Valve 10.The delivery outlet 11 of guide oil supply valve 10 is connected to the oil inlet 12 of pilot valve 5, to supply hydraulic oil to pilot valve 5.First
The oil return opening 13 of Oil Guide supply valve 10 and the oil return opening 14 of pilot valve 5 are all connected to oil return line 15.
Return filter 16 is equipped at the position of fuel tank 8 in oil return line 15, to filter out the impurity in oil.
The oil return opening 66 of hydraulic unit 6 is also connected to oil return line 15.Radiator 17 is equipped on oil return line 15,
To carry out cooling to the withdrawing oil of heating.
In the following, by logic control hydraulic subsystem 7 composition and effect be described in detail.
As shown in Figure 1, logic control hydraulic subsystem 7 is in addition to above-mentioned first port 71, second port 72 and third end
Also there is the 4th port 74, fifth port 75 and the 6th port 76 except mouth 73.4th port 74, which is connected to, leads to main control valve 61
Oil inlet 62 oil feed line 18 and be hydraulically connected to oil inlet 62, fifth port 75 is connected to the feedback port of main control valve 61
67, the 6th port 76 is hydraulically connected to oil return line 15 as oil return opening.
Logic control hydraulic subsystem 7 has shuttle valve 77, and shuttle valve 77 has first entrance 771, second entrance 772 and goes out
Mouth 773.Outlet 773 is connected to flow control mouth 108, and first entrance 771 is connected to fifth port 75 and hydraulic with feedback port 67
Connection, second entrance 772 are connected to the feedback port 28 of switching valve 21.
Logic control hydraulic subsystem 7 also has the check valve 78 being connected between second port 72 and the 4th port 74,
Only to allow hydraulic oil to flow to the 4th port 74 from second port 72.
In addition, logic control hydraulic subsystem 7 also has 2/2 proportioning valve 79, relief valve 80 and flow controller 81.2/2 ratio
First hydraulic port 791 of example valve 79 is connected between second port 72 and check valve 78 and is hydraulically connected to fixed capacity pumps 3
The first control port 792 of 31,2/2 proportioning valve 79 of outlet be connected between check valve 78 and the 4th port 74 and hydraulic connecting
The second hydraulic port 793 to 18,2/2 proportioning valve 79 of oil feed line is connected to the 6th port 76 and is hydraulically connected to oil return pipe
Second control port 794 of 15,2/2 proportioning valve 79 of road is connected to fifth port 75 by flow controller 81.One end of relief valve 80
Be connected between the second control port 794 of 2/2 proportioning valve 79 and flow controller 81 and with the second control port 794 and flow controller 81
Equal hydraulic connecting, the other end are connected to the 6th port 76 and are hydraulically connected to oil return line 15.
Flow controller 81 is designed to control the pressure difference at 81 both ends of flow controller for predetermined value.
It must be noted that logic control hydraulic subsystem 7 can be formed by connecting by multiple Hydraulic Elements as described above, from
And may not be a self-contained unit truly, but these Hydraulic Elements included by it can be played jointly and be patrolled
Collect control action.These ports may not also be the connectivity port of physical presence, such as second port 72 may and be not present, phase
The outlet 31 of fixed capacity pumps 3 can be instead set to be directly connected to check valve 78 by one section of pipeline, certainly check valve 78 at this time
Input port is considered as second port 72.However, according to a preferred exemplary embodiment, it can be hydraulic by logic control
Subsystem 7 is integrated on main control valve 61 as a first device.
In the following, will be described in the worked of hydraulic control system shown in FIG. 1, particularly logic control hydraulic subsystem
Journey and control principle.
When only steering unit 2 is operated (that is, hydraulic unit 6 is not operated), pressure-gradient control valve 4 is by load-sensitive pressure
The outlet 101 of power flow control variable pump 1 is connected to the holding of pump interface 26, so that load-sensitive pressure flow hybrid control variable
The hydraulic oil of 1 output of pump is directly pumped into steering unit 2, to drive steering unit 2 to realize desired steering.Another party
Face, when steering unit 2 is operated, feedback pressure can be applied to the shuttle valve 77 of logic control hydraulic subsystem 7 by feedback port 28
Second entrance 772, and at this time first entrance 771 due to the feedback port 67 with main control valve 61 is connect and be in low pressure, shuttle
The outlet 773 of valve 77 will export the feedback pressure, and be applied to flow control mouth 108, while the feedback pressure of feedback port 28 is straight
Connect the feedback port 42 for being applied to pressure-gradient control valve 4.Load-sensitive pressure flow hybrid control variable pump 1 is adjusted by flow control mouth 108
Output flow.In this sense, it steering unit 2, load-sensitive pressure flow hybrid control variable pump 1, pressure-gradient control valve 4 and patrols
The shuttle valve 77 for collecting control hydraulic subsystem 7 constitutes load-sensitive hydraulic system at this time.In other words, load-sensitive pressure flow hybrid control
Variable pump 1 provides required flow to steering unit 2 according to the feedback pressure at feedback port 28, therefore can damage to avoid overflow
It loses.
When only hydraulic unit 6 (i.e. pilot valve 5) is operated or steering unit 2 is grasped with hydraulic unit 6 simultaneously
When making, feedback pressure can be applied to the first entrance 771 of shuttle valve 77 by the feedback port 67 of main control valve 61, at this point, shuttle valve 77 can select
Select the greater in the feedback pressure of main control valve 61 and the feedback pressure of steering unit 2, and by its export 773 feed back to it is negative
Carry the flow control mouth 108 of sensitive pressure flow control variable pump 1.In this case, load-sensitive pressure flow hybrid control becomes
Amount pump 1 can be adjusted towards maximum pump discharge direction.When the discharge capacity of load-sensitive pressure flow hybrid control variable pump 1 is enough to make pressure-gradient control valve 4
Spool when being moved to the second position, the entrance 44 of pressure-gradient control valve 4 is connected to second outlet 43 and can permit towards hydraulic
6 feed hydraulic oil of unit.In this case, pressure-gradient control valve 4 can distribute stream between steering unit 2 and hydraulic unit 6
Amount.If the system pressure of hydraulic control system is more than the setting pressure of load-sensitive pressure flow hybrid control variable pump 1, load
Sensitive pressure flow control variable pump 1 will reduce output flow automatically, therefore also without any spill losses.At this point, due to
System pressure is higher, and the check valve 78 of logic control hydraulic subsystem 7 is squeezed and is closed, thus, fixed capacity pumps 3 are defeated
Hydraulic oil out will not be transported to the oil inlet 62 of main control valve 61.On the other hand, due to the second control of 2/2 proportioning valve 79
Port 794 is connected to the feedback port 67 of main control valve 61 by flow controller 81, under throttling action, at the second control port 794
Pressure is usually less than the pressure of feedback port 67, and the first control port 792 of 2/2 proportioning valve 79 is communicated to oil feed line 18 and locates
Under the pressure higher than the pressure at the second control port 794, when the pressure difference between them is greater than the predetermined of 2/2 proportioning valve 79
When opening pressure, 2/2 proportioning valve 79 is opened, and the hydraulic oil that fixed capacity pumps 3 export can be hydraulic from the first of 2/2 proportioning valve 79
Port 791 flows directly to the second hydraulic port 793, and then flows back into oil return line 15 further around relief valve 80 is crossed.
Individual hydraulic list is still unable to satisfy when load-sensitive pressure flow hybrid control variable pump 1 reaches its maximum pump discharge
When the demand or hydraulic unit 6 and steering unit 2 (when being operated) common demand of member 6, system pressure can decline, from
And check valve 78 can be opened under the output pressure of fixed capacity pumps 3 and allow the hydraulic oil from fixed capacity pumps 3 towards confession
Oil pipe line 18 flows, with the flow demand covered the shortage.In other words, fixed capacity pumps 3 are only in load-sensitive pressure flow hybrid control
It can be just participated in when variable pump 1 reaches or approaches maximum pump discharge to 6 fuel feeding of hydraulic unit, otherwise fixed capacity pumps 3 export
Hydraulic oil fuel tank 8 can be flowed back into the low pressure loss by 2/2 proportioning valve 79.
It will be obvious to those skilled in the art that fixed capacity pumps 3 can also be kept quick in load by appropriately designed
Sense pressure flow hybrid control variable pump 1 reach a certain pre- fixed displacement lower than maximum pump discharge, such as maximum pump discharge 90% when just join
With to 6 fuel feeding of hydraulic unit.
By introducing flow controller 81, the pressure and main control valve 61 of the second control port 794 of 2/2 proportioning valve 79 can control
Feedback port 67 pressure between relationship, it might even be possible to keep the pressure of the second control port 794 of 2/2 proportioning valve 79 independent
In or be isolated from main control valve 61 feedback port 67 feedback pressure, this allows to control 2/2 proportioning valve 79 for greater flexibility.
In addition, by introducing relief valve 80, the hydraulic oil for flowing through flow controller 81 from the feedback port 67 of main control valve 61 is reaching
Fuel tank 8 can be flowed back into when certain pressure.Even if relief valve 80 is opened, due to the effect of flow controller 81, it can be ensured that main control valve
The feedback pressure of 61 feedback port 67 is correctly introduced into the first entrance 711 of shuttle valve 77, so as to correctly adjust negative
Carry the discharge capacity of sensitive pressure flow control variable pump 1.
Obviously, the proportioning valve of relief valve 80 and 2/2 79 limits the maximum value of the output pressure of fixed capacity pumps 3 jointly, this
More flexibilities are provided for the design of hydraulic control system.
An exemplary embodiment according to the present utility model, can the main control valve 61 of hydraulic unit 6 spool it
It is preceding or pressure compensator is set later, so that being only dependent upon the opening of spool towards the hydraulic oil distribution of hydraulic unit 6
Area, and it is no longer dependent on load.
It is obvious to a person skilled in the art, that fixed capacity pumps 3 can also be replaced with variable pump.
Moreover, according to the utility model, can make to the steering hydraulic system of 2 fuel feeding of steering unit and to hydraulic unit
The execution hydraulic system hydraulic pressure separating of 6 fuel feeding, so as to save pressure-gradient control valve 4.
As described above, embodiment shown in fig. 1 utilizes the pressure between the oil inlet 62 and feedback port 67 of hydraulic unit 6
Power difference detects whether load-sensitive pressure flow hybrid control variable pump 1 has reached pre- fixed displacement, particularly maximum pump discharge.However,
The displacement condition of load-sensitive pressure flow hybrid control variable pump 1 is detected there is also different methods.
Another exemplary embodiment according to the present utility model, the first control port 792 and second of 2/2 proportioning valve 79
Control port 794 is connected respectively to outlet 101 and the flow control mouth 108 of load-sensitive pressure flow hybrid control variable pump 1.If
Pressure difference between the first control port 792 and the second control port 794 of 2/2 proportioning valve 79 is less than the control of load-sensitive pressure flow
The predetermined adjustment value of variable pump 1 processed, then load-sensitive pressure flow hybrid control variable pump 1 is in maximum pump discharge state.
Another exemplary embodiment according to the present utility model, the first control port 792 and second of 2/2 proportioning valve 79
Control port 794 is connected respectively to the entrance 44 and second outlet 43 of pressure-gradient control valve 4.
Another exemplary embodiment according to the present utility model, it is clear that the first control port 792 of 2/2 proportioning valve 79
Outlet 101 and the pressure-gradient control valve 4 of load-sensitive pressure flow hybrid control variable pump 1 can also be connected respectively to the second control port 794
Second outlet 43.
It is obvious to a person skilled in the art, that the hydraulic control system of the utility model can also be applied to other
Equipment of the hydraulic control system, such as fork truck, excavator etc. are needed, loading machine is not limited solely to.
Moreover, for a person skilled in the art, other advantages and alternative embodiment of the utility model are
Obviously.Therefore, shown in the utility model is not limited to for its wider range of meaning and the detail,
Representative configurations and exemplary embodiment.On the contrary, those skilled in the art can not depart from the substantially smart of the utility model
It carry out various modifications and substitutes in the case where mind and range.
Claims (10)
1. a kind of hydraulic control system, including：
First hydraulic actuator (2)；
At least one second hydraulic actuator (6) with oil inlet (62) and is suitable for feeding back the negative of the second hydraulic actuator (6)
First feedback port of load situation；
As the pressure flow hybrid control variable pump (1) of the first pump, with variable pump discharge (101) and flow control mouth (108)；
Second pump (3), outlet (31) are hydraulically connected to the oil inlet (62) of the second hydraulic actuator (6) by check valve (78)
And hydraulic oil is only allowed to flow from the second pump (3) to the second hydraulic actuator (6)；
It is characterized in that, the hydraulic control system further includes for controlling the first hydraulic actuator (2) and/or second hydraulic holding
The logic control hydraulic subsystem (7) of row device (6) includes at least 2/2 proportioning valve (79), flow controller (81) and relief valve
(80), wherein 2/2 proportioning valve (79) has the first hydraulic port (791), the second hydraulic port (793), the first control port
(792) and the second control port (794), the first hydraulic port (791) hydraulic connecting is in the outlet (31) of the second pump (3) and single
To between valve (78), the second hydraulic port (793) is hydraulically connected to oil return line (15), the first control port (792) hydraulic company
The first hydraulic connecting point is connect between check valve (78) and the oil inlet (62) of the second hydraulic actuator (6) or is hydraulically connected to,
Second control port (794) is hydraulically connected to the first feedback port or hydraulic of the second hydraulic actuator (6) by flow controller (81)
It is connected to the second hydraulic connecting point, is adapted to detect for pressing based on the pressure difference between the first hydraulic connecting point and the second hydraulic connecting point
The predetermined displacement condition of power flow control variable pump (1), one end hydraulic connecting of relief valve (80) is in the second control port (794)
Between flow controller (81), the other end is hydraulically connected to oil return line (15).
2. hydraulic control system as described in claim 1, which is characterized in that
The hydraulic control system further includes pressure-gradient control valve (4), the pressure-gradient control valve (4) have entrance (44), first outlet (41) with
And second outlet (43), wherein entrance (44) hydraulic connecting of the variable pump discharge (101) and the pressure-gradient control valve (4), it is described
The oil inlet hydraulic connecting of the first outlet (41) of pressure-gradient control valve (4) and the first hydraulic actuator (2), the of the pressure-gradient control valve (4)
Two outlets (43) are hydraulically connected to the oil inlet (62) of the second hydraulic actuator (6)；And
The logic control hydraulic subsystem (7) further includes shuttle valve (77), and first entrance (771) hydraulic connecting of shuttle valve (77) exists
Between flow controller (81) and the first feedback port or the second hydraulic connecting point of the second hydraulic actuator (6), the second of shuttle valve (77)
Entrance (772) is hydraulically connected to the of the load state for being suitable for feeding back the first hydraulic actuator (2) of the first hydraulic actuator (2)
The outlet (773) of two feedback ports, shuttle valve (77) is hydraulically connected to flow control mouth (108).
3. hydraulic control system as claimed in claim 2, which is characterized in that
The first hydraulic connecting point is the entrance (44) of variable pump discharge (101) or pressure-gradient control valve (4)；And/or
The second hydraulic connecting point is the second outlet (43) of flow control mouth (108) or pressure-gradient control valve (4)；And/or
The predetermined displacement condition is maximum pump discharge state.
4. such as hydraulic control system as claimed in any one of claims 1-3, which is characterized in that
First hydraulic actuator (2) is steering unit；And/or
Second pump (3) is fixed capacity pumps；And/or
The logic control hydraulic subsystem (7) is integrated into the main control valve (61) of the second hydraulic actuator (6) as first device
On.
5. such as hydraulic control system as claimed in any one of claims 1-3, which is characterized in that
The hydraulic control system further includes pilot valve (5), multiple ports of the pilot valve (5) and the second hydraulic actuator
(6) the corresponding port hydraulic connecting of main control valve (61)；And/or
Second pump (3) is gear pump.
6. hydraulic control system as claimed in claim 2 or claim 3, which is characterized in that
The pressure-gradient control valve (4) also has the third feedback port with the second feedback port hydraulic connecting of the first hydraulic actuator (2), with
The entrance (44) of the pressure-gradient control valve (4) and the is connected to when the output pressure of pressure flow hybrid control variable pump (1) reaches setting value
Two outlets (43).
7. such as hydraulic control system as claimed in any one of claims 1-3, which is characterized in that
Pressure compensator is provided with before or after the spool of the main control valve (61) of the second hydraulic actuator (6).
8. hydraulic control system as described in claim 1, which is characterized in that
Second pump (3) is variable pump；And/or
Hydraulic system to the first hydraulic actuator (2) fuel feeding and the hydraulic system to the second hydraulic actuator (6) fuel feeding are each other
Hydraulic pressure separating.
9. a kind of movable type working equipment, which is characterized in that the movable type working equipment is equipped with any in claim 1-8
The hydraulic control system.
10. movable type working equipment as claimed in claim 9, which is characterized in that
The movable type working equipment is loading machine or fork truck or excavator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721219420.4U CN208123138U (en) | 2017-09-21 | 2017-09-21 | Hydraulic control system and corresponding mobile working equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721219420.4U CN208123138U (en) | 2017-09-21 | 2017-09-21 | Hydraulic control system and corresponding mobile working equipment |
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| CN208123138U true CN208123138U (en) | 2018-11-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519428A (en) * | 2019-01-09 | 2019-03-26 | 江苏汇智高端工程机械创新中心有限公司 | A kind of more hydraulic pump multiplex control systems, work connection and engineering machinery |
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2017
- 2017-09-21 CN CN201721219420.4U patent/CN208123138U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519428A (en) * | 2019-01-09 | 2019-03-26 | 江苏汇智高端工程机械创新中心有限公司 | A kind of more hydraulic pump multiplex control systems, work connection and engineering machinery |
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