CN105201933B - A kind of proportionality velocity modulation hydraulic system based on speed feedback - Google Patents
A kind of proportionality velocity modulation hydraulic system based on speed feedback Download PDFInfo
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- CN105201933B CN105201933B CN201510021368.0A CN201510021368A CN105201933B CN 105201933 B CN105201933 B CN 105201933B CN 201510021368 A CN201510021368 A CN 201510021368A CN 105201933 B CN105201933 B CN 105201933B
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Abstract
The present invention relates to a kind of proportionality velocity modulation hydraulic system based on speed feedback, including flow divider, fuel tank, main oil pump, pioneer pump and the liquid controlled reversing proportioning valve for being commutated to executive component, flow divider includes being provided with oil inlet, oil-out, the valve body of control mouth and load feedback mouthful, control mouth receives external control signal and changed with the change of external control signal, oil inlet and main oil pump outlet, oil-out is connected with fuel tank, control mouth and pioneer pump outlet, load feedback mouthful is connected with the actuator port of liquid controlled reversing proportioning valve, main oil pump and pioneer pump export power by same output shaft, so that pioneer pump is reflected as the change of the engine speed of main oil pump and pioneer pump offer power.The flow divider that the proportionality velocity modulation hydraulic system based on speed feedback that the present invention is provided changes by using control pressure and changed with engine speed, its speed adjusting performance is improved, it is possible to achieve the uniformity of speed adjusting performance under two kinds of operating modes of high engine speeds and low speed.
Description
Technical field
The present invention relates to technical field of engineering machinery, more particularly to a kind of proportionality velocity modulation hydraulic pressure system based on speed feedback
System.
Background technology
The proportionality velocity modulation hydraulic system that existing construction machinery industry is used relies primarily on the pressure before and after flow divider setting main valve
Poor Δ P is invariable, then realizes the speed adjusting performance of system by adjusting the openings of sizes of main valve valve rod.This hydraulic system
Pressure differential deltap P constant magnitudes before and after main valve are constant, and the speed adjusting performance of hydraulic system is main by the flow of system and opening for primary valve
Mouthful size is determined.
As shown in figure 1, being the control principle drawing of flow divider in the prior art, master is passed through by the hydraulic pump a1 hydraulic oil provided
Valve port a2 gives load a4 fuel feeding, and flow divider a3 is connected in parallel on working connection.Flow divider a3 is applied to proportionality velocity modulation hydraulic system
Structural representation is referring to Fig. 2, and the system is mainly using hydraulic pump a1 overflow-type regulative modes in parallel, and flow divider a3 therein is used for
Ensure that the pressure difference before and after primary valve a2 is constant, the aperture area that the system relies primarily on control bound mouthful a2 carrys out the stream of regulating system
Amount, so as to realize the speed adjusting performance of system.
The speed adjusting performance of the system is influenceed larger by engine speed, because the pressure difference before and after primary valve is main by shunting
The setting pressure of valve spring chamber is determined, so the speed adjusting performance of the hydraulic system is mainly determined by the openings of sizes of primary valve.Root
The area formula of restriction is flowed through according to fluidUnderstand, in C1, Δ P it is invariable in the case of, flow through and be
The flow of system is mainly determined by the aperture area of primary valve, and the aperture area of primary valve is mainly determined by the displacement of valve rod
Fixed, the displacement of valve rod is bigger within the specific limits, and the aperture area of primary valve is also bigger.Therefore, pressure difference before and after primary valve
When constant, the traffic requirement of pump discharge, speed governing can be met in the case of low speed low discharge, when primary valve aperture area is smaller
Poor-performing；The traffic requirement of pump discharge, speed governing can be met in the case of big flow, when primary valve aperture area is larger
Can be preferably.
In existing hydraulic system, Δ P setting value determines the speed adjusting performance of system.System Δ P setting values compared with
Hour, engine is under speed operation, and system is by the way that in the case of compared with low discharge, main valve valve rod can be by increasing restriction
Area ensures flow that system passes through, and system speed adjusting performance is preferable；But engine is under high-speed working condition, and system passes through larger
In the case of flow, main valve valve rod can not ensure the flow that system passes through by unconfined increase area, so certainly will
Increasing for system pressure is caused, the stability of system is influenceed, the efficiency of system is reduced；Conversely, the Δ P setting values in system are larger
When, engine is under speed operation, and main valve valve rod can meet the requirement of flow system flow, the adjustable model of opening in very little opening
Enclose smaller, the speed adjusting performance of system is poor；Engine is under high-speed working condition, and the flow that system passes through is larger, and main valve valve rod passes through
The requirement of flow needed for open can meet system, the good speed adjustment features of system.
In summary, the problem of proportionality velocity modulation hydraulic system of the prior art is present is mainly：
(1) speed adjusting performance uniformity is poor：The pressure differential deltap P of existing system is invariable, the area of passage of main valve valve rod not with
The change of flow system flow and change, the speed regulating section of system is only relevant with the flow of system, thus system speed regulating section in hair
There is larger difference under motivation low speed and high speed, its speed adjusting performance is influenceed larger by engine speed, it is impossible to ensure speed governing
The uniformity of energy.
(2) energy loss is big：When existing system engine is standby, system still has certain pressure, and system
All flows flow back to fuel tank from flow divider restriction, and engine still has certain power output, the energy of system under the operating mode
Amount loss is larger.
(3) system quantity of heat production is high：Existing system is in the case where engine awaits orders operating mode, and the flow of system passes through flow divider restriction
Certain heat can be produced by flowing back to fuel tank, cause the thermal equilibrium temperature of system too high, to the performance and used life of Hydraulic Elements
Produce certain influence.
The content of the invention
The purpose of the present invention is to propose to a kind of proportionality velocity modulation hydraulic system based on speed feedback, more preferable tune is resulted in
There is provided the condition for improving system speed adjusting performance for fast performance.
To achieve the above object, the invention provides a kind of proportionality velocity modulation hydraulic system based on speed feedback, including point
Valve, fuel tank, main oil pump, pioneer pump and the liquid controlled reversing proportioning valve for being commutated to executive component are flowed, wherein the shunting
Valve includes being provided with oil inlet, oil-out, control mouth and load feedback mouthful on valve body, the valve body, and the control mouth receives outer
Portion's control signal, and change with the change of the external control signal, the outlet of the oil inlet and the main oil pump,
The oil-out is connected with the fuel tank, the control mouth and the outlet of the pioneer pump, the load feedback mouthful and institute
The actuator port connection of liquid controlled reversing proportioning valve is stated, the main oil pump and the pioneer pump are exported by same output shaft
Power, so that the pioneer pump is reflected as the change of the engine speed of the main oil pump and pioneer pump offer power.
Further, the flow divider also includes valve rod, spring, First Transition block and end cap, wherein the valve rod is located at
The inside of the valve body, the end cap is arranged on one end of the valve body, and the end cap has hollow structure, the First Transition
Block is installed in the hollow structure of the end cap, and the First Transition block will be by the end cap, the valve body and valve rod institute
The chamber surrounded is divided into separate pilot control cavity volume and spring cavity, and the First Transition block and the end cap form described
Pilot control cavity volume, the outlet of the hollow structure of the end cap forms control mouth, and the control mouth receives external control signal, and
Change with the change of the external control signal, the First Transition block, the end cap, the valve body and the valve rod are common
The spring cavity is formed, the spring is arranged in the spring cavity, and is arranged on the valve rod, the First Transition block bag
Hollow structure is included, the termination of the valve stem end is inserted into the hollow structure of the First Transition block, and the valve rod can
Relative to First Transition block motion, it is provided with the valve body on oil inlet and oil-out, the valve rod and is provided with load
Feedback port, the pressure of the load feedback mouthful enters the spring cavity by the load feedback oil duct being arranged in the valve rod.
Further, the flow divider also includes being arranged at check valve in the termination, the import of the check valve with
The pilot control cavity volume connection, the outlet of the check valve is connected with the load feedback mouthful, the pilot control cavity volume
Pressure carries out off-load by the check valve and the load feedback mouthful.
Further, the flow divider also includes the first damping being arranged in the termination, and first damping is in institute
State and path is formed in the central axis direction of valve rod, and one-way valve structures are formed with the valve element of the check valve.
Further, the flow divider also includes the second transition block, and second transition block is installed on the First Transition
In the hollow structure of block, second transition block forms path in the central axis direction of the valve rod.
Further, second transition block can be slided in the hollow structure of the First Transition block, and promote institute
State stem movement.
Further, the flow divider also includes sealing ring, by described between the First Transition block and the end cap
Sealing ring is sealed.
Further, the flow divider also includes plug, and the plug is arranged on end of the valve body away from the spring
End, the plug, the valve body and the valve rod are collectively forming right side cavity volume.
Further, the flow divider also includes the second damping, and second damping is arranged on the valve rod away from described
One end of spring, one end for the path that second damping is formed in the central axis direction of the valve rod connects with the right side cavity volume
Logical, the other end is connected by the opening set on the valve rod with the oil inlet.
Further, the main oil pump and the pioneer pump are constant displacement pump.
Further, the proportionality velocity modulation hydraulic system based on speed feedback also includes pressure difference control device, the pressure
Poor control device is connected with the pioneer pump, and the pressure difference control device can receive turning with engine for the pioneer pump output
The change of speed and the pressure signal that changes, and the pressure signal is sent to the flow divider.
Further, the pressure difference control device is automatic pressure difference compensation valve or electric proportional pressure control valve.
Further, the proportionality velocity modulation hydraulic system based on speed feedback also includes main overflow valve, the main overflow
The import of valve and the outlet of the main oil pump, the outlet of the main overflow valve is connected with the fuel tank.
Further, the proportionality velocity modulation hydraulic system based on speed feedback also includes balanced valve and motor, described flat
Weighing apparatus valve and the motor are connected with the another two actuator port of the liquid controlled reversing proportioning valve.
Further, the proportionality velocity modulation hydraulic system based on speed feedback also includes secondary relief, described secondary
The oil inlet of overflow valve is connected with another actuator port of the liquid controlled reversing proportioning valve, the oil-out of the secondary relief
Connected with the fuel tank.
Based on above-mentioned technical proposal, the proportionality velocity modulation hydraulic system proposed by the present invention based on speed feedback, by using
The flow divider that control pressure changes and changed with engine speed, its speed adjusting performance is improved, it is possible to achieve high in engine
The uniformity of speed adjusting performance under speed and two kinds of operating modes of low speed.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the control principle drawing of flow divider in the prior art.
Fig. 2 is the structural representation of proportionality velocity modulation hydraulic system in the prior art.
Fig. 3 is the structural representation of flow divider one embodiment of the present invention.
Fig. 4 is the structural representation of proportionality velocity modulation hydraulic system one embodiment of the invention based on speed feedback.
Fig. 5 is change curve of the main valve flow in Fig. 2 proportionality velocity modulation hydraulic systems with main valve displacement of valve rod.
Fig. 6 is change curve of the main valve flow in Fig. 4 embodiments with main valve displacement of valve rod.
Fig. 7 is flow divider control mouth pressure versus time curve in Fig. 4 embodiments.
In figure：A1- hydraulic pumps, a2- primary valves, a3- flow dividers, a4- loads, 1- flow dividers, 2- valve bodies, 3- valve rods, 4-
Spring, 5- spring cavitys, 6- oil inlets, 7- oil-outs, 8- control mouths, 9- load feedbacks mouthful, 10- check valves, 11- end caps, 12- is blocked up
Head, 13- First Transition blocks, 14- sealing rings, 15- first is damped, and 16- second is damped, the transition blocks of 17- second, 18- pilot controls
Chamber, 19- terminations, 21- fuel tanks, 22- main oil pumps, 23- pioneer pumps, 24- main valves, the main overflow valves of 25-, 26- liquid controlled reversing proportioning valves,
27- secondary reliefs, 28- balanced valves, 29- motors, the automatic pressure difference compensation valves of 30-, a- high speed down-off change curves, b- low speed
Down-off change curve, c- high speed down-off change curves, d- low speed down-off change curves, the lower flow divider control mouth of e- high speeds
Flow divider control mouth pressure under pressure, f- low speed.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is clearly and completely retouched
State.Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on this hair
Bright embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
In the description of the invention, it is to be understood that term " " center ", " transverse direction ", " longitudinal direction ", "front", "rear",
The orientation or position relationship of the instruction such as "left", "right", " on ", " under ", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than indicate or dark
Specific orientation must be had, with specific azimuth configuration and operation by showing the device or element of meaning, therefore it is not intended that right
The limitation of the scope of the present invention.
In order to the speed adjusting performance for solving existing proportionality velocity modulation hydraulic system it is inconsistent the problem of, the invention provides a kind of base
In the proportionality velocity modulation hydraulic system of speed feedback, as shown in figure 4, being somebody's turn to do the proportionality velocity modulation hydraulic system based on speed feedback includes dividing
Valve 1, fuel tank 21, main oil pump 22, pioneer pump 23 and the liquid controlled reversing proportioning valve 26 for being commutated to executive component are flowed, wherein
The flow divider 1 includes being provided with oil inlet 6, oil-out 7, control mouth 8 and load feedback mouthful 9, institute on valve body 2, the valve body 2
State control mouth 8 and receive external control signal, and change with the change of the external control signal, the oil inlet 6 with it is described
The outlet of main oil pump 22, the oil-out 7 is connected with the fuel tank 21, and the control mouth 8 goes out with the pioneer pump 23
Mouth connection, the load feedback mouthful 9 is connected with an actuator port of the liquid controlled reversing proportioning valve 26, the He of main oil pump 22
The pioneer pump 23 exports power by same output shaft, so that the pioneer pump 23 is reflected as the main oil pump 22 and described
Pioneer pump 23 provides the change of the engine speed of power.
The proportionality velocity modulation hydraulic system based on speed feedback that the present invention is provided, by setting flow divider, pioneer pump output
The change with engine speed and change pressure signal is reflected in the control pressure of flow divider, the control pressure of flow divider with
The change of engine speed and change so that system is under any rotating speed of engine, and main valve is by flow with the displacement of valve element
Proportional increase, realizes the proportionality velocity modulation of valve control, improves the speed adjusting performance of system.
Below using low engine speed flow be 100L/min and high speed flow as 260L/min two kinds of operating modes under comparison diagram 2
The speed adjusting performance of middle proportionality velocity modulation hydraulic system and the proportionality velocity modulation hydraulic system of the invention based on speed feedback：
It should be noted that above-mentioned low engine speed flow is 100L/min and high speed flow is that 260L/min is intended merely to
Illustrate the practical effect of the present invention, and two examples enumerated do not constitute limiting the scope of the invention.
Fig. 5 is change curve of the main valve flow in existing proportionality velocity modulation hydraulic system with main valve displacement of valve rod, and curve a is height
Fast down-off change curve, curve b is low speed down-off change curve.Fig. 6 is the proportionality velocity modulation of the invention based on speed feedback
Main valve flow is with the change curve of main valve displacement of valve rod in hydraulic system, and curve c is high speed down-off change curve, and curve d is
Low speed down-off change curve.
By the way that with upper curve, in existing proportionality velocity modulation hydraulic system, main valve pressure differential deltap P is invariable, is starting
The flow of the system is 100L/min under machine speed operation, and the flow of system increases with the increase of main valve displacement of valve rod,
During stem movement 3mm, the area of passage of valve port has been able to meet the flow that system passes through, i.e., under speed operation, main valve valve
The adjustable extent of bar is 3mm, and speed adjustable range is smaller；The flow of system is 260L/min under high engine speeds operating mode, is now
The flow of system is larger, it is ensured that larger flow flows through, and the aperture area of main valve valve port is sufficiently large, from Fig. 5 change curve
Understand, after main valve valve rod movement 8mm, the flow that the aperture area of valve port could meet 260L/min passes through, the adjustable model of main valve
Enclose for 8mm, speed adjustable range is larger, and speed adjusting performance is preferable.Therefore, under two kinds of different rotating speeds of engine, the speed governing of existing system
Interval one between 0-3mm, one between 0-8mm, the uniformity of speed regulating section is poor, and speed adjusting performance is poor, in addition thus
Also result in the problems such as system energy loss is big, system quantity of heat production is higher.
And in proportionality velocity modulation hydraulic system of the present invention based on speed feedback, when engine is under speed operation,
It is assumed that the flow of system is 100L/min, as shown in fig. 7, now flow divider control mouth pressure is the pressure difference before and after 38bar, main valve
Δ P is smaller, and system needs the openings of sizes of constantly increase valve port to ensure flow that system passes through, and system speed governing is interval
The good speed adjustment features under 9mm or so, therefore speed operation, control stability is high.When engine is under high-speed working condition, it is assumed that
The flow of system is 260L/min, as shown in fig. 7, now flow divider control mouth pressure is the pressure differential deltap P before and after 65bar, main valve
It is relatively large, in the case of main valve stem aperture area identical, because the Δ P of main valve under high-speed working condition is relatively large, pass through master
The flow of valve rod is also larger, it is ensured that basically identical, system under speed regulating section and speed operation of the system under high-speed working condition
Overall good speed adjustment features.
As shown in figure 3, being the structural representation of flow divider one embodiment of the present invention, the flow divider 1 includes valve body 2, valve
Bar 3, spring 4, First Transition block 13 and end cap 11, wherein the valve rod 3 is located at the inside of the valve body 2, the end cap 11 is pacified
Mounted in one end of the valve body 2, the end cap 11 has hollow structure, and the First Transition block 13 is installed on the end cap 11
In hollow structure, the First Transition block 13 separates the chamber surrounded by the end cap 11, the valve body 2 and the valve rod 3
For separate pilot control cavity volume 18 and spring cavity 5, the First Transition block 13 and the end cap 11 form the guide
Cavity volume 18 is controlled, the outlet of the hollow structure of the end cap 11 forms control mouth 8, and the control mouth 8 receives external control signal,
And change with the change of the external control signal, the First Transition block 13, the end cap 11, the valve body 2 and described
Valve rod 3 is collectively forming the spring cavity 5, and the spring 4 is arranged in the spring cavity 5, and is arranged on the valve rod 3, institute
Stating First Transition block 13 includes hollow structure, and the termination 19 of the end of valve rod 3 is inserted into the First Transition block 13
In hollow structure, the valve rod 3 can be moved relative to the First Transition block 13, and oil inlet 6 is provided with the valve body 2 and is gone out
Load feedback mouthful 9 is provided with hydraulic fluid port 7, the valve rod 3, the pressure of the load feedback mouthful 9 is by being arranged in the valve rod 3
Load feedback oil duct enter the spring cavity 5.
Wherein, First Transition block is mainly used in bearing spring, spring setting and spring cavity, when valve rod is to left movement,
The left end of spring can be acted against on First Transition block, stepped additionally, due to valve rod, and end portion is thinner, from end portion
It is gradually thicker to the right, so when valve rod is moved right, the right-hand member of spring can be acted against on valve rod.In addition, in end cap
In hollow structure, there is certain space between First Transition block and control mouth, First Transition block left end cavity volume and end cap form elder generation
Control cavity volume is led, the pilot control cavity volume is used for the guide oil for storing to come in from control mouth, when guide's control pressure reaches necessarily
During degree, under the promotion of guide oil, the first damping promotes valve rod to move right.In addition, termination 19 is not independent one
Part, termination 19 is a part for valve rod 3.
The flow divider relies primarily on control mouth pressure, load feedback mouthful pressure, initial tension of spring and inlet pressure and maintained
In the state of relative equilibrium.When the system residing for flow divider does not work, the pressure of load feedback mouthful is substantially zeroed, pilot control
The pressure of cavity volume can carry out off-load by load feedback mouthful, and spring cavity pressure diminish, valve rod under inlet pressure effect, gram
Take initial tension of spring to be moved to the left, so that oil inlet is connected with oil-out, realize the off-load of whole system；Residing for flow divider
System it is in running order when, flow divider promotes valve rod to move right by the pressure of load feedback mouthful and control mouth so that
Oil inlet is set not connected with oil-out, system worked well.
Above-mentioned flow divider is due to being provided with pilot control cavity volume, and the pilot control cavity volume is separated with spring cavity, realizes shunting
Pilot control pressure and the respective independent control of load feedback pressure in valve, the spring cavity are connected with control mouth, the spring cavity
Pressure can change with the change of control mouth pressure, therefore the control pressure at flow divider two ends can receive signal with control mouth
Change and change, therefore can by the flow divider be used for various corresponding hydraulic systems in, realize the changeability of control pressure.
In the proportionality velocity modulation hydraulic system of the present invention, controlled because the pressure differential deltap P before and after main valve is main by spring force and guide
Power processed is determined, and the spring in the flow divider of the present invention is slinky spring, and the pretightning force of spring is smaller, therefore in proportionality velocity modulation liquid
Press under system engine low speed, low flow rate condition, pilot control pressure can be set smaller, by the excessively stream for changing main valve valve rod
Area ensures flow that system passes through, the good speed adjustment features of system；In hydraulic system high engine speeds, the operating mode of big flow
Under, pilot control pressure can be set relatively large, to ensure that the speed adjusting performance of system is consistent with speed operation under the operating mode,
And zone of control is big.As can be seen here, the proportionality velocity modulation hydraulic system that the present invention is provided can overcome the problem of speed adjusting performance is poor.
In one embodiment, the flow divider 1 can also include the check valve 10 being arranged in the termination 19, described
The import of check valve 10 is connected with the pilot control cavity volume 18, and outlet and the load feedback mouthful 9 of the check valve 10 connect
Logical, the pressure of the pilot control cavity volume 18 carries out off-load by the check valve 10 and the load feedback mouthful 9.
The effect of the check valve, on the one hand, operationally, check valve can prevent the high pressure of load feedback mouthful to hydraulic system
Oil is flowed back in pilot control cavity volume, realizes the independent control of pilot control pressure and load feedback control pressure to respective pressure
System；On the other hand, when hydraulic system does not work, and the pressure of load feedback mouthful is zero, the flow divider in the present invention can be realized
The off-load of pilot control oil, i.e. the pressure of control mouth can carry out off-load by check valve and load feedback mouthful, it is ensured that hydraulic pressure system
Working connection only need to overcome less spring force when carrying out off-load in system.
In another embodiment, the flow divider 1 can also include the first damping 15 being arranged in the termination 19,
First damping 15 forms path in the central axis direction of the valve rod 3, and is formed unidirectionally with the valve element of the check valve 10
Valve arrangement.
The form of first damping and installation position are equipped with many kinds, as long as can realize that it is acted on.Such as, the first damping
It can be arranged on inside the termination of valve rod, path is formed in valve rod central axis direction so that the hydraulic oil flowed out from control mouth is first
By the first damping, spring cavity is entered back into, the flow of the control mouth can be controlled by the first damping.
In one embodiment, the flow divider 1 can also include the second transition block 17, and second transition block 17 is installed
In in the hollow structure of the First Transition block 13, second transition block 17 forms logical in the central axis direction of the valve rod 3
Road.Second transition block forms path in valve rod central axis direction, it is ensured that the stability of flow.
Preferably, second transition block 17 can be slided in the hollow structure of the First Transition block 13, and be promoted
The valve rod 3 is moved.So, in the presence of guide's control pressure, guide oil promotes the second transition block to slide, the second transition block
The first damped motion is promoted again, and then promotes stem movement.
In another embodiment, the flow divider 1 can also include sealing ring 14, the First Transition block 13 with it is described
Sealed between end cap 11 by the sealing ring 14.Sealing ring is by First Transition block and end cap seal, it is ensured that pilot control cavity volume
Respective independent control is realized with spring cavity.
Preferably, the flow divider 1 can also include plug 12, and the plug 12 is arranged on the valve body 2 away from described
The end of spring 4, the plug 12, the valve body 2 and the valve rod 3 are collectively forming right side cavity volume.The plug is arranged on valve body
End, insertion valve rod form closed circuit.
Preferably, the flow divider 1 can also include the second damping 16, and second damping 16 is arranged on the valve rod 3
One end away from the spring 4, the one end for the path that second damping 16 is formed in the central axis direction of the valve rod 3 and institute
Right side cavity volume connection is stated, the other end is connected by the opening set on the valve rod 3 with the oil inlet 6.
Second damping also form path in valve rod central axis direction, while being connected by the opening with being arranged on valve rod
It is logical, the hydraulic fluid flow rate of flow divider oil inlet can be controlled, meet the requirement of flow system flow.The liquid come in from oil inlet
Force feed by second damping formed path, into right side cavity volume, when the oil pressure of right side cavity volume reaches to a certain degree, valve rod to
Move left.
Preferably, the main oil pump 22 and the pioneer pump 23 are constant displacement pump.Constant displacement pump be each revolution of theoretical displacement not
The pump of change, when engine speed changes, because every discharge capacity that turns of constant displacement pump is constant, its rotational frequency can change therewith, therefore should
Constant displacement pump can reflect the change of engine speed.
In one embodiment, the proportionality velocity modulation hydraulic system based on speed feedback can also include pressure difference control dress
Put, the pressure difference control device is connected with the pioneer pump 23, it is defeated that the pressure difference control device can receive the pioneer pump 23
The pressure signal changed with the change of engine speed gone out, and the pressure signal is sent to the flow divider 1.
The form of wherein described pressure difference control device has many kinds, as long as can feed back the rotating speed of engine to realize shunting
The change of valve control mouth pressure.Such as the pressure difference control device can be automatic pressure difference compensation valve 30, electric proportional pressure control valve
Or other control system.
As shown in figure 4, the action principle of automatic pressure difference compensation valve is：When system does not work, automatic pressure difference compensation valve enters
Hydraulic fluid port is connected with fuel tank, and oil-out is connected with the control mouth of flow divider, due to no source pressure, and flow divider control mouth pressure does not have
Change.And when engine is in running order, guide's pump output pressure promotes the valve element of automatic pressure difference compensation valve to transport downwards
Dynamic, the working position of automatic pressure difference compensation valve is slided, and the oil pressure of pioneer pump can be entered by the actuator port of automatic pressure difference compensation valve
Enter the spring cavity of flow divider, because the automatic pressure difference compensation valve is slide-valve, therefore the pressure differential deltap P at flow divider two ends can be realized
Raised with the rise of engine speed, the aperture of primary valve meets the manipulation speed adjusting performance under low engine speed, works as hair
When motivation rotating speed is raised, Δ P rises are increased by the flow of main valve with primary valve aperture Δ A increase, so as to ensure system
Speed adjusting performance do not changed by the change of engine speed, realize the uniformity of speed adjusting performance.
Preferably, the proportionality velocity modulation hydraulic system based on speed feedback can also include main overflow valve 25, the master
The import of overflow valve 25 and the outlet of the main oil pump 22, the outlet of the main overflow valve 25 is connected with the fuel tank 21.
Main overflow valve is controlled to the pressure on system working connection, is prevented excessive impact of oil pressure and is damaged oil circuit and related member
Part.
The proportionality velocity modulation hydraulic system based on speed feedback can also include balanced valve 28 and motor 29, the balance
Valve 28 and the motor 29 are connected with the another two actuator port of the liquid controlled reversing proportioning valve 26.Balanced valve is used to maintain motor
Working condition.
Secondary relief 27 can also be set in the proportionality velocity modulation hydraulic system based on speed feedback, it is described secondary
The oil inlet of overflow valve 27 is connected with another actuator port of the liquid controlled reversing proportioning valve 26, the secondary relief 27
Oil-out is connected with the fuel tank 21.Flow divider, liquid controlled reversing proportioning valve, main overflow valve and secondary in the hydraulic system of the present invention
Overflow valve can be integrally as main valve 24, and secondary relief is used to control the pressure between liquid controlled reversing ratio valve outlet and motor
Power, prevents oil pressure is excessive from causing hydraulic shock and damaging oil circuit and related elements.
The embodiment for the proportionality velocity modulation hydraulic system based on speed feedback that the present invention is provided at least have with next or
Multiple advantages：
(1) speed adjusting performance uniformity is good：In the case where the area of passage of main valve valve rod is invariable, flow divider spring cavity
Pressure changes with the change of engine speed, and pressure differential deltap P is with the change of flow divider spring cavity pressure before and after system main valve
And synchronously change.Pressure differential deltap P is relatively small before and after main valve under slow-speed of revolution low discharge for system, and the speed regulating section of system can be maintained
In larger scope；Pressure differential deltap P is relatively large before and after main valve under high rotating speed big flow for system, and the speed regulating section of system can also be tieed up
Hold in larger scope.In the case where rotating speed is different, the system can ensure system by the size of Δ P before and after change main valve
The uniformity of speed governing, and maintain interior in a big way.
(2) energy loss is small：When the system engine is standby, the pressure of system flow divider hydraulic pressure cavity volume is basic
It is zero, the pretightning force of spring cavity is smaller, because the pressure that system is produced mainly is determined by the pretightning force of shunting valve spring；Shunting
The pretightning force of valve spring chamber is smaller, therefore the pressure needed for system is relatively small, and engine only needs to export less power
The requirement of system is met, the energy loss of system is smaller.
(3) system quantity of heat production is small：The system is in the case where engine awaits orders operating mode, and system only needs less pressure to overcome point
Valve spring pretightning force is flowed, the heat that the flow of system flows back to fuel tank generation by flow divider restriction is smaller, the thermal balance of system
Temperature can be significantly reduced, and can be effectively protected the performance of Hydraulic Elements, improve service life.
The proportionality velocity modulation hydraulic system based on speed feedback that the present invention is designed, can be lower point according to engine different rotating speeds
The situation of change of valve control mouth pressure is flowed, by adjusting the area of passage of pressure difference and valve rod before and after main valve, realizes system not
With the uniformity of speed regulating section under rotating speed so that the maneuverability pattern of crane also has significantly in terms of fine motion and controllability
Improve.In addition, the present invention is intended merely to better illustrate the actual use of the present invention to the elaboration in above content about numerical value
Effect, does not constitute limiting the scope of the invention.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
The embodiment of the present invention can be modified or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical scheme, it all should cover among claimed technical scheme scope of the invention.
Claims (15)
1. a kind of proportionality velocity modulation hydraulic system based on speed feedback, it is characterised in that including flow divider (1), fuel tank (21), master
Oil pump (22), pioneer pump (23) and the liquid controlled reversing proportioning valve (26) for being commutated to executive component, wherein the shunting
Valve (1) includes being provided with oil inlet (6), oil-out (7), control mouth (8) and load feedback mouthful on valve body (2), the valve body (2)
(9), the control mouth (8) receives external control signal, and the control pressure of the control mouth (8) is believed with the outside control
Number change and change, the outlet of the oil inlet (6) and the main oil pump (22), the oil-out (7) and the oil
Case (21) is connected, the control mouth (8) and the outlet of the pioneer pump (23), the load feedback mouthful (9) and the liquid
The actuator port connection of control commutation proportioning valve (26), the main oil pump (22) and the pioneer pump (23) pass through same defeated
Shaft exports power, so that the pioneer pump (23) is reflected as the main oil pump (22) and the pioneer pump (23) provides power
The change of engine speed.
2. the proportionality velocity modulation hydraulic system according to claim 1 based on speed feedback, it is characterised in that the flow divider
(1) valve rod (3), spring (4), First Transition block (13) and end cap (11) are also included, wherein the valve rod (3) is located at the valve body
(2) inside, the end cap (11) is arranged on one end of the valve body (2), and the end cap (11) has hollow structure, described the
One transition block (13) is installed in the hollow structure of the end cap (11), and the First Transition block (13) will be by the end cap
(11), the chamber that the valve body (2) and the valve rod (3) are surrounded is divided into separate pilot control cavity volume (18) and spring
Chamber (5), the First Transition block (13) and the end cap (11) the formation pilot control cavity volume (18), the end cap (11)
The outlet of hollow structure forms control mouth (8), the First Transition block (13), the end cap (11), the valve body (2) and described
Valve rod (3) is collectively forming the spring cavity (5), and the spring (4) is arranged in the spring cavity (5), and is arranged in the valve
On bar (3), the First Transition block (13) includes hollow structure, and the termination (19) of valve rod (3) end is inserted into described
In the hollow structure of First Transition block (13), the valve rod (3) can be moved relative to the First Transition block (13), the valve
It is provided with body (2) on oil inlet (6) and oil-out (7), the valve rod (3) and is provided with load feedback mouthful (9), the load is anti-
The pressure of feedback mouth (9) enters the spring cavity (5) by the load feedback oil duct being arranged in the valve rod (3).
3. the proportionality velocity modulation hydraulic system according to claim 2 based on speed feedback, it is characterised in that the flow divider
(1) check valve (10) being arranged in the termination (19), import and the pilot control of the check valve (10) are also included
Cavity volume (18) is connected, and the outlet of the check valve (10) is connected with the load feedback mouthful (9), the pilot control cavity volume (18)
Pressure pass through the check valve (10) and the load feedback mouthful (9) and carry out off-load.
4. the proportionality velocity modulation hydraulic system according to claim 3 based on speed feedback, it is characterised in that the flow divider
(1) the first damping (15) being arranged in the termination (19) is also included, first damping (15) is in the valve rod (3)
Path is formed on direction of principal axis, and one-way valve structures are formed with the valve element of the check valve (10).
5. the proportionality velocity modulation hydraulic system according to claim 2 based on speed feedback, it is characterised in that the flow divider
(1) the second transition block (17) is also included, second transition block (17) is installed on the hollow structure of the First Transition block (13)
Interior, second transition block (17) forms path in the central axis direction of the valve rod (3).
6. the proportionality velocity modulation hydraulic system according to claim 5 based on speed feedback, it is characterised in that second mistake
Crossing block (17) can slide in the hollow structure of the First Transition block (13), and promote the valve rod (3) to move.
7. the proportionality velocity modulation hydraulic system according to claim 2 based on speed feedback, it is characterised in that the flow divider
(1) sealing ring (14) is also included, it is close by the sealing ring (14) between the First Transition block (13) and the end cap (11)
Envelope.
8. the proportionality velocity modulation hydraulic system according to claim 2 based on speed feedback, it is characterised in that the flow divider
(1) plug (12) is also included, the plug (12) is arranged on end of the valve body (2) away from the spring (4), the plug
(12), the valve body (2) and the valve rod (3) are collectively forming right side cavity volume.
9. the proportionality velocity modulation hydraulic system according to claim 8 based on speed feedback, it is characterised in that the flow divider
(1) the second damping (16) is also included, second damping (16) is arranged on the one end of the valve rod (3) away from the spring (4),
The one end for the path that second damping (16) is formed in the central axis direction of the valve rod (3) is connected with the right side cavity volume,
The other end is connected by the opening set on the valve rod (3) with the oil inlet (6).
10. the proportionality velocity modulation hydraulic system according to claim 1 based on speed feedback, it is characterised in that the main oil
Pump (22) and the pioneer pump (23) are constant displacement pump.
11. the proportionality velocity modulation hydraulic system according to claim 10 based on speed feedback, it is characterised in that described to be based on
The proportionality velocity modulation hydraulic system of speed feedback also includes pressure difference control device, the pressure difference control device and the pioneer pump (23)
Connection, the pressure difference control device can receive the pressure changed with the change of engine speed of the pioneer pump (23) output
Force signal, and the pressure signal is sent to the flow divider (1).
12. the proportionality velocity modulation hydraulic system according to claim 11 based on speed feedback, it is characterised in that the pressure difference
Control device is automatic pressure difference compensation valve (30) or electric proportional pressure control valve.
13. the proportionality velocity modulation hydraulic system according to claim 12 based on speed feedback, it is characterised in that described to be based on
The proportionality velocity modulation hydraulic system of speed feedback also includes main overflow valve (25), import and the main oil of the main overflow valve (25)
The outlet of pump (22), the outlet of the main overflow valve (25) is connected with the fuel tank (21).
14. the proportionality velocity modulation hydraulic system according to claim 13 based on speed feedback, it is characterised in that described to be based on
The proportionality velocity modulation hydraulic system of speed feedback also includes balanced valve (28) and motor (29), the balanced valve (28) and the motor
(29) the another two actuator port with the liquid controlled reversing proportioning valve (26) is connected.
15. the proportionality velocity modulation hydraulic system according to claim 14 based on speed feedback, it is characterised in that described to be based on
The proportionality velocity modulation hydraulic system of speed feedback also includes secondary relief (27), the oil inlet of the secondary relief (27) and institute
State another actuator port connection of liquid controlled reversing proportioning valve (26), oil-out and the fuel tank of the secondary relief (27)
(21) connect.
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| CN201510021368.0A CN105201933B (en) | 2015-01-15 | 2015-01-15 | A kind of proportionality velocity modulation hydraulic system based on speed feedback |
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| CN201510021368.0A CN105201933B (en) | 2015-01-15 | 2015-01-15 | A kind of proportionality velocity modulation hydraulic system based on speed feedback |
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| CN105201933B true CN105201933B (en) | 2017-09-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108412831B (en) * | 2018-05-09 | 2023-07-25 | 河北华春液压汽配有限公司 | Shunt pressure-regulating speed-regulating reversing integrated valve |
| CN112128153B (en) * | 2020-09-03 | 2022-08-05 | 徐州重型机械有限公司 | Novel variable-pressure-difference load sensing system of constant delivery pump and control method thereof |
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| CN2058913U (en) * | 1989-11-09 | 1990-07-04 | 西安冶金建筑学院 | Hydraulic controller for crane lifting |
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| CN105201933A (en) | 2015-12-30 |
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