CN109268352A - Hydraulic control system and corresponding mobile working equipment - Google Patents
Hydraulic control system and corresponding mobile working equipment Download PDFInfo
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- CN109268352A CN109268352A CN201710564473.8A CN201710564473A CN109268352A CN 109268352 A CN109268352 A CN 109268352A CN 201710564473 A CN201710564473 A CN 201710564473A CN 109268352 A CN109268352 A CN 109268352A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- 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
-
- 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Hydraulic control system includes: fixed capacity pumps；Variable pump with variable pump discharge and flow control mouth；The first hydraulic actuator with pump interface and feedback port；Second hydraulic actuator comprising have the main control valve of oil inlet；The pressure-gradient control valve exported with entrance and first, second, entrance is connected to always with first outlet, variable pump discharge is coupled with inlet pressure, the oil inlet Hydraulic coupling of first outlet and the first hydraulic actuator, the outlet of second outlet and fixed capacity pumps with oil inlet Hydraulic coupling；Shuttle valve with the first, second entrance and exit, for first entrance Hydraulic coupling in feedback port, outlet hydraulic is coupled in flow control mouth；Detection device, detection indicate the indication signal to be operated to the second hydraulic actuator；And electric-controlled type control valve, being connected between second entrance and variable pump discharge and being connected to variable pump discharge when detection device detects indication signal is connected to second entrance with fuel tank with second entrance, otherwise.System is simple, reliable.
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.
Especially in loading machine, excavator, fork truck etc., had using hydraulic drive and control system more obviously excellent
Gesture.In this hydraulic drive and control system, two hydraulic pumps in parallel are usually provided with, to reduce restriction loss and overflow
Loss.One is the gear pump with fixed displacement preferably wherein, another is variable pump.These pumps hydraulic can be held to multiple
Row device conveys hydraulic oil.Hydraulic actuator is for example including running driving device, the hydraulic cylinder of hydraulic arm and for adjusting traveling
The transfer etc. in direction.
However, low-load may make system pressure be unable to reach with when bearing load in current hydraulic control system
Scheduled value, so that corresponding control valve can not be opened and prevent variable pump to the main actuating mechanism other than transfer
Hydraulic conveying, this can cause a series of problem, for example, cause main actuating mechanism (non-go to action) movement it is slack-off, also may be used
Energy hydraulic cylinder has emptying phenomenon.Moreover, existing control valve uses hydraulic control mode, so that the structure of hydraulic control system is multiple
Miscellaneous, higher cost, poor reliability.
Need to provide a kind of improved hydraulic control system thus.
Summary of the invention
The object of the present invention is to provide a kind of high efficient and reliable, the simple hydraulic control system of structure and a kind of corresponding shiftings
Dynamic formula working equipment.
According to the first aspect of the invention, a kind of hydraulic control system is provided, comprising: fixed capacity pumps；Pressure current
Amount control variable pump, with variable pump discharge and flow control mouth；It is necessary to ensure that by the first hydraulic actuator of preferential fuel feeding,
Its feedback port with pump interface and the load state suitable for feeding back the first hydraulic actuator；At least one second hydraulic execution
Device comprising the main control valve with oil inlet；Pressure-gradient control valve, with entrance, first outlet and second outlet, the entrance and
One outlet is connected to always, and the variable pump discharge is coupled with the inlet pressure, the first outlet and the first hydraulic actuator
Pump interface Hydraulic coupling, the outlet of the second outlet and the fixed capacity pumps with the oil inlet Hydraulic coupling；Shuttle
Valve, with first entrance, second entrance and outlet, the first entrance Hydraulic coupling in the feedback port, the shuttle valve
Outlet hydraulic is coupled in the flow control mouth；Detection device, the second hydraulic actuator will be grasped by being used to detect expression
The indication signal of work；And electric-controlled type control valve, it is connected between the second entrance and the variable pump discharge, and be suitable for
The change is connected to when the detection device detects the indication signal that expression will operate second hydraulic actuator
Measuring pump discharge is connected to second entrance with fuel tank with the second entrance, otherwise.
According to an alternative embodiment, the electric-controlled type control valve has automatically controlled port, the first hydraulic port, second hydraulic
Port and third hydraulic port, the automatically controlled port and detection device communicate to connect, to receive control letter from detection device
Number, first hydraulic port is connected to fuel tank, the second entrance Hydraulic coupling of second hydraulic port and the shuttle valve, institute
Third hydraulic port is stated to couple with the variable pump outlet hydraulic；And/or the detection device passes through the second hydraulic execution of detection
The component of device acts to detect the indication signal for indicating to be operated to second hydraulic actuator.
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.
Hydraulic control system configuration of the invention is simple, high reliablity, while can be avoided restriction loss and spill losses.
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 is the system for being illustrated the hydraulic control system of an exemplary embodiment according to the present invention with loading machine
Block diagram.
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 is the system for being illustrated the hydraulic control system of an exemplary embodiment according to the present invention with loading machine
Block diagram.
As shown in Figure 1, the hydraulic control system of loading machine specifically includes that load-sensitive pressure flow hybrid control variable pump 1, turns
It is controlled to unit 2, the fixed capacity pumps 3 of preferably gear pump, pressure-gradient control valve 4, at least one hydraulic unit 5, electric-controlled type 3/2
Valve 6, shuttle valve 7 and the detection device 8 for detecting the indication signal that expression will operate the hydraulic unit 5.
The steering unit 2 is used to adjust the driving direction of loading machine.At least one described hydraulic unit 5 for example can be loading
Hydraulic cylinder on the cantilever of machine.Obviously, the number amount and type of at least one hydraulic unit 5 are unrestricted, but can
Think any quantity and any appropriate type.Steering unit 2 and hydraulic unit 5 are actually hydraulic actuator.
The steering unit 2 includes switching valve 21.There are two steering cylinder interfaces 22,23 for the tool of switching valve 21, they divide
It is not connect with two steering cylinders 24,25, steering is realized using the two steering cylinders.The switching valve 21 also has pump interface
26, oil return opening 27 and feedback port 28.The oil return opening 27 is connected to fuel tank 10, pump interface 26 and pressure-gradient control valve 4 by oil return line 9
First outlet 41 connect, feedback port 28 connect with the feedback port 42 of the first entrance 71 of shuttle valve 7 and pressure-gradient control valve 4.Oil return line 9
It is equipped with radiator 11, to carry out cooling to the withdrawing oil of heating.
Preferably, the switching valve 21 closes middle position.When steering unit 2 is operated, feedback port 28 connects with steering cylinder
Mouth 22,23 connects.When steering unit 2 is not operated, feedback port 28 is connect with oil return opening 27.
Other than first outlet 41 and feedback port 42, the pressure-gradient control valve 4 also has second outlet 43 and entrance 44.Second
Outlet 43 is connected to the oil inlet 52 of the main control valve 51 of the hydraulic unit 5, and entrance 44 is connected to load-sensitive pressure current
The outlet 101 of amount control variable pump 1.The spool of the pressure-gradient control valve 4 is maintained at first position by spring 45.In the first position,
The entrance 44 is connected to first outlet 41, and second outlet 43 is ended.It is applied in the spring side of spool by feedback port 42
Feedback pressure is applied with the pressure at first outlet 41 in the opposite side of spring.It is preferential that the pretightning force of the spring 45 corresponds to one
Pressure difference can be adjusted to such as 15bar.If the difference of the feedback pressure at pressure and feedback port 42 at first outlet 41
Greater than the preferential pressure difference, then the spool of pressure-gradient control valve 4 is mobile to the second position.In this case, entrance 44 goes out with second
Mouthfuls 43 are connected to, and the access between entrance 44 and first outlet 41, which is slightly throttled, (but not to be closed, to guarantee to steering unit
2 hydraulic pressure supply can be interrupted in no instance).
Preferably, the main control valve 51 of hydraulic unit 5 opens middle position.
Fixed capacity pumps 3 have constant discharge capacity (flow).The outlet 31 of fixed capacity pumps 3 is connected to by unloading valve 12
The oil inlet 52 of main control valve 51.Unloading valve 12 can limit the maximum value of the output pressure of fixed capacity pumps 3, and unloading valve 12 passes through pre-
Loading spring is maintained at closed position.When system pressure reaches predetermined threshold, unloading valve 12 is opened, so as to by hydraulic oil
Fuel tank 10 is conducted directly to from the outlet of fixed capacity pumps 3.Fixed capacity pumps 3 are by hydraulic oil only to hydraulic from fuel tank 10
Unit 5 conveys, without conveying to steering unit 2.
Return filter 13 is equipped at the position of fuel tank 10 in oil return line 9, to filter out the impurity in oil.
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 is adjusted using adjusting cylinder 102 and kicker cylinder 103.The kicker cylinder 103 and load-sensitive pressure flow hybrid control
The outlet 101 of variable pump 1 connects.In this case, once 1 driven device of load-sensitive pressure flow hybrid control variable pump
(not shown) rotation, then load-sensitive pressure flow hybrid control variable pump 1 will be mobile towards maximum direction of the traffic (maximum pendulum angle).
It is additionally provided with spring in the kicker cylinder 103, therefore, even if load-sensitive pressure flow hybrid control variable pump 1 does not rotate, is also adjustable
Maximum stream flow out.
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 10 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
The upper limit of output pressure.
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 10.In the spring opposite side of the second regulating valve 105, load-sensitive pressure flow hybrid control variable
The output pressure of pump 1 is applied in the second regulating valve 105, thus can be by the second regulating valve 105 under sufficiently high output pressure
It is moved to the second position.In the second position, the adjusting cylinder 102 is supported sensitive pressure flow by the first regulating valve 104
Variable pump 1 is controlled to pressurize.The flow control mouth 108 that the outlet 72 with shuttle valve 7 is connect is additionally provided in 107 side of spring.To load
The output pressure of sensitive pressure flow control variable pump 1 and the difference of the pressure at flow control mouth 108 are smaller, adjust cylinder 102 just
It is mobile towards the direction for increasing flow.
3/2 control valve 6 of electric-controlled type has automatically controlled port 61, the first hydraulic port 62, the second hydraulic port 63 and third
Hydraulic port 64.Automatically controlled port 61 is by signal wire 14 or is wirelessly electrically connected with detection device 8, in detection device 8
Detect that indication signal that expression will operate hydraulic unit 5 (such as detects the manipulator of hydraulic unit 5
Handle is manipulated) when, detection device 8 sends corresponding control signal to the automatically controlled port 61 of 3/2 control valve 6 of electric-controlled type, with control
The operation of 3/2 control valve 6 of electric-controlled type.First hydraulic port 62 is connected to fuel tank 10.Second hydraulic port 63 and the second of shuttle valve 7
Entrance 73 connects.Third hydraulic port 64 is connect with the outlet 101 of load-sensitive pressure flow hybrid control variable pump 1.
Hydraulic unit 5 also has output port A1, B1, A2, B2, they be connected to corresponding hydraulic cylinder 53,54,
55。
When only steering unit 2 is operated (that is, hydraulic unit 5 is not operated), pressure-gradient control valve 4 is by load-sensitive pressure
The outlet 101 of flow control variable pump 1 is connected to the holding of pump interface 26, so that load-sensitive pressure flow hybrid control variable pump
The hydraulic oil of 1 conveying is directly pumped into steering unit 2, to drive steering unit 2 to realize desired steering.At this point, preferential
What the second outlet 43 of valve 4 was off, so that hydraulic oil will not flow to hydraulic unit 5.On the other hand, at this time due to hydraulic
Working cell 5 is not operated, thus, detection device 8 will not send control letter to the automatically controlled port 61 of 3/2 control valve 6 of electric-controlled type
Number.In this case, the first hydraulic port 62 of 3/2 control valve 6 of electric-controlled type is connected to the second hydraulic port 63 and leads to oil
Case 10 (the first operating position), the third hydraulic port 64 of 3/2 control valve 6 of electric-controlled type be off (that is, load-sensitive pressure current
The hydraulic oil that amount control variable pump 1 conveys will not enter in 3/2 control valve 6 of electric-controlled type).When steering unit 2 is operated, instead
Feedback pressure can be applied to the first entrance 71 of shuttle valve 7 by feedback mouth 28, and second entrance 73 is led to fuel tank 10 and is in low at this time
Pressure, therefore the outlet 72 of shuttle valve 7 will export feedback pressure, and be applied to flow control mouth 108.It can by flow control mouth 108
Adjust the output flow of load-sensitive pressure flow hybrid control variable pump 1.In this sense, steering unit 2, load-sensitive pressure
Power flow control variable pump 1, pressure-gradient control valve 4, shuttle valve 7 and 3/2 control valve 6 of electric-controlled type constitute load-sensitive hydraulic system at this time.
In other words, needed for load-sensitive pressure flow hybrid control variable pump 1 is provided according to the feedback pressure at feedback port 28 to steering unit 2
Flow, pressure-gradient control valve 4, therefore can be to avoid any restriction loss and spill losses there is no acting at this time.
When only hydraulic unit 5 needs operation or steering unit 2 and hydraulic unit 5 to need to operate simultaneously, inspection
Survey device 8 can detect expression will to the indication signal (such as movement of operation handle) that hydraulic unit 5 is operated and
Corresponding control signal is sent to the automatically controlled port 61 of 3/2 control valve 6 of electric-controlled type, this makes 3/2 control valve 6 of electric-controlled type be in the
Two operating positions, third hydraulic port 64 is connected to the second hydraulic port 63 at this time, so that load-sensitive pressure flow hybrid control becomes
Amount pump 1 can act on the second entrance 73 of shuttle valve 7 through the hydraulic oil of 101 output of outlet.At this point, the selection of shuttle valve 7 enters through first
The feedback pressures (when steering unit 2 is not operated, feedback pressure is system back pressure) and load-sensitive pressure current of 71 input of mouth
The greater in the output pressure of amount control variable pump 1, and load-sensitive pressure flow hybrid control variable is transported to by outlet 72
The flow control mouth 108 of pump 1.Clearly as the reasons such as pressure drop, feedback pressure is inevitably less than the change of load-sensitive pressure flow hybrid control
The output pressure of amount pump 1, therefore, the output pressure of load-sensitive pressure flow hybrid control variable pump 1 will eventually be applied to load
On the flow control mouth 108 of sensitive pressure flow control variable pump 1, load-sensitive pressure flow hybrid control variable pump 1 will at this time
Transform to maximum pump discharge (flow).In this case, pressure-gradient control valve 4 can distribute between steering unit 2 and hydraulic unit 5
Flow.If the system pressure of hydraulic control system is more than the setting pressure of load-sensitive pressure flow hybrid control variable pump 1, bear
Output flow will be reduced automatically by carrying sensitive pressure flow control variable pump 1, therefore also without any spill losses.
According to the present invention, hydraulic unit 5 is operated due to using the directly detection expression of detection device 8
Therefore indication signal can reliably know to the order operated to hydraulic unit 5, and can be straight by this order
It connects, feed back to 3/2 control valve 6 of electric-controlled type reliably to control 3/2 control valve 6 of electric-controlled type.However, in existing hydraulic control system
In system, judge to operate hydraulic unit indirectly by system pressure by pilot valve and shuttle valve group, that is, be conducted to
The system pressure of mechanical 3/2 control valve reaches a threshold value (such as 5bar) and just switches mechanical 3/2 control valve.In such case
Under, if hydraulic unit only executes some simple low load (or even load) operations, such as swing arm decline or scraper bowl
The threshold value may be not achieved in outer pendulum, system pressure, thus mechanical 3/2 control valve cannot normally switch and prevent pressure-gradient control valve from
Hydraulic oil is distributed into hydraulic unit from load-sensitive pressure flow hybrid control variable pump.
Moreover, as described above, hydraulic control system of the invention eliminates pilot valve, shuttle valve group and corresponding hydraulic member
Part, so that the structure of hydraulic control system is more simple, cost is lower, and reliability is higher.
As shown in Figure 1, detection device 8 includes first detection unit 81 and second detection unit 82, they are arranged in
On two spools of illustrative main control valve 51, to detect the movement of spool.When operation handle is moved, operation can be passed through
Transmission mechanism band movable valve plug between handle and spool is mobile, to carry out to hydraulic unit 5 so as to reliably detect
Operation.However, being arranged on spool if will test unit, it may be necessary to be redesigned to spool.In fact, for this
For the technical staff in field, not tube detection device 8 setting wherein, as long as be able to detect that will to hydraulic unit 5 into
Row operation, as long as example, operation handle one is operated, so that it may which hydraulic unit 5 will be operated by detecting.Example
Such as, detection device 8 can be set at any position of the transmission mechanism of operation handle.
It should be pointed out that when using electric-controlled type operating device, such as operation panel to control hydraulic unit
When, 3/2 control valve 6 of electric-controlled type directly can receive control signal from the electric-controlled type operating device and control to switch electric-controlled type 3/2
Valve 6.At this point, detection device is not to be operated to hydraulic unit by detecting the movement of a certain component to detect.
According to a preferred embodiment of the present invention, first detection unit 81 and/or second detection unit 82 can be position
Set switch.
According to a preferred embodiment of the present invention, 3/2 control valve 6 of electric-controlled type can be 3/2 control valve of electromagnetic type.When
So, other any suitable control valves can also be used.
Moreover it is preferred that as shown in Figure 1, being originated from the fluid pressure line and fixed capacity pumps 3 of the second outlet 43 of pressure-gradient control valve 4
Output pipe merge, be then attached to the oil inlet 52 of the main control valve 51 of hydraulic unit 5.
Hydraulic control system according to the present invention, when only steering unit is operated, fixed capacity pumps free-runing operation, and bear
The required pressure operation that sensitive pressure flow control variable pump is carried to set.When to operate at least one hydraulic unit,
Control corresponding control valve by detecting the electric signal for indicating to carry out the operation, load-sensitive pressure flow hybrid control variable pump with
Maximum stream flow operation, no matter whether steering unit is operated at this time.
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 (10)
1. a kind of hydraulic control system, comprising:
Fixed capacity pumps (3)；
Pressure flow hybrid control variable pump (1), with variable pump discharge (101) and flow control mouth (108)；
First hydraulic actuator (2), with pump interface (26) and the load state for being suitable for feeding back the first hydraulic actuator (2)
Feedback port (28)；
At least one second hydraulic actuator (5) comprising the main control valve (51) with oil inlet (52)；
Pressure-gradient control valve (4), with entrance (44), first outlet (41) and second outlet (43), the entrance (44) goes out with first
Mouthful (41) are connected to always, the variable pump discharge (101) and the entrance (44) Hydraulic coupling, the first outlet (41) and the
Pump interface (26) Hydraulic coupling of one hydraulic actuator (2), the outlet of the second outlet (43) and the fixed capacity pumps (3)
(31) with the oil inlet (52) Hydraulic coupling；
Shuttle valve (7), with first entrance (71), second entrance (73) and outlet (72), the hydraulic coupling of the first entrance (71)
Together in the feedback port (28), outlet (72) Hydraulic coupling of the shuttle valve (7) is in the flow control mouth (108)；
Detection device (8), being used to detect expression will be to the indication signal that the second hydraulic actuator (5) are operated；And
Electric-controlled type control valve (6) is connected between the second entrance (73) and the variable pump discharge (101), and is suitable for
The connection when the detection device (8) detects that expression will be to the indication signal that second hydraulic actuator (5) is operated
The variable pump discharge (101) is connected to second entrance (73) with fuel tank (10) with the second entrance (73), otherwise.
2. hydraulic control system as described in claim 1, which is characterized in that
The electric-controlled type control valve (6) have automatically controlled port (61), the first hydraulic port (62), the second hydraulic port (63) and
Third hydraulic port (64), the automatically controlled port (61) and detection device (8) communicate to connect, to receive from detection device (8)
Signal is controlled, first hydraulic port (62) is connected to fuel tank (10), second hydraulic port (63) and the shuttle valve (7)
Second entrance (73) Hydraulic coupling, the third hydraulic port (64) and variable pump discharge (101) Hydraulic coupling；With/
Or
The detection device (8) by detect the second hydraulic actuator (5) component movement come detect expression will be to described the
The indication signal that two hydraulic actuators (5) are operated.
3. hydraulic control system as claimed in claim 1 or 2, which is characterized in that
The electric-controlled type control valve (6) is 3/2 control valve；And/or
First hydraulic actuator (2) is steering unit；And/or
The main control valve (51) has at least one spool, and the detection device (8) is arranged on spool and/or second hydraulic holds
In the operation handle of row device (5) and/or on from the operation handle to the transmission mechanism spool.
4. hydraulic control system as claimed in claim 3, which is characterized in that
The electric-controlled type control valve (6) is 3/2 control valve of electromagnetic type；And/or
There are two spool, the detection device (8) has to be arranged on described two spools main control valve (51) tool
First detection unit (81) and second detection unit (82), the first detection unit (81) and/or second detection unit (82)
For position switch；And/or
The steering unit includes switching valve (21), and the switching valve (21) closes middle position.
5. the hydraulic control system as described in any in foregoing Claims, which is characterized in that
The outlet (31) of the fixed capacity pumps (3) is connected to the oil inlet (52) of the main control valve (51) by fluid pressure line,
The second outlet (43) of the pressure-gradient control valve (4) is connected to the fluid pressure line, so as to can be jointly to main control valve (51) fuel feeding.
6. the hydraulic control system as described in any in foregoing Claims, which is characterized in that
Unloading valve (12) are additionally provided between the fixed capacity pumps (3) and the main control valve (51)；And/or
The fixed capacity pumps (3) are gear pump.
7. the hydraulic control system as described in any in foregoing Claims, which is characterized in that
The pressure-gradient control valve (4) also has the feedback port with feedback port (28) Hydraulic coupling of first hydraulic actuator (2)
(42), the entrance of the pressure-gradient control valve (4) is connected to when reaching setting value with the output pressure in pressure flow hybrid control variable pump (1)
(44) with second outlet (43)；And/or
The main control valve (51) opens middle position.
8. the hydraulic control system as described in any in foregoing Claims, which is characterized in that
The pressure flow hybrid control variable pump (1) is implemented as Wobble plate pump.
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 |
|---|---|---|---|
| CN201710564473.8A CN109268352A (en) | 2017-07-12 | 2017-07-12 | Hydraulic control system and corresponding mobile working equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710564473.8A CN109268352A (en) | 2017-07-12 | 2017-07-12 | Hydraulic control system and corresponding mobile working equipment |
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| Publication Number | Publication Date |
|---|---|
| CN109268352A true CN109268352A (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710564473.8A Pending CN109268352A (en) | 2017-07-12 | 2017-07-12 | Hydraulic control system and corresponding mobile working equipment |
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| CN (1) | CN109268352A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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