CN109372813A - A kind of electro-hydraulic proportional throttle valve and its control method - Google Patents
A kind of electro-hydraulic proportional throttle valve and its control method Download PDFInfo
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- CN109372813A CN109372813A CN201811459535.XA CN201811459535A CN109372813A CN 109372813 A CN109372813 A CN 109372813A CN 201811459535 A CN201811459535 A CN 201811459535A CN 109372813 A CN109372813 A CN 109372813A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/16—Special measures for feedback, e.g. by a follow-up device
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
A kind of electro-hydraulic proportional throttle valve and its control method, throttle valve includes displacement sensor (1), valve pocket (6), proportional reversing valve (8), main valve plug (10), valve body (12), inlet pressure sensor (13), outlet pressure sensor (17), it switchs reversal valve (19), main valve lid (20) and operational amplifying module (21), valve pocket (6) and main valve plug (10) are hollow cylindrical structure, valve pocket (6) is mounted in valve body (12) inner cavity, main valve plug (10) is nested in valve pocket (6), displacement sensor (1) lower part is mounted in main valve plug (10)；The displacement of main valve plug (10), the inlet and outlet pressure of this throttle valve and the corresponding restriction coefficient of corresponding spool displacement are associated by control method by flow equation, carry out closed-loop control by operational amplifying module (21).Controlling dead error is small, meets to equipment automatization and intelligentized demand for control.
Description
Technical field
The present invention relates to a kind of hydraulic system, more specifically to a kind of electro-hydraulic proportional throttle valve and its control method,
Belong to hydraulic control valve technical field.
Background technique
Control element of the hydraulic control valve as hydraulic system usually requires that its compact-sized, easy to operate, control essence
Really, reliability and durability.
Throttle valve in hydraulic control valve is commonly used in adjusting flow in hydraulic system, frequently with manual, hydraulic control, electricity
The aperture of control or electrichydraulic control valve port realizes regulatory function.The throttle valve of current manual and hydraulic control is mainly with opened loop control
Based on, control precision is influenced seriously by load and the flowed fluctuation of system, and control precision is lower, it is difficult to realize long-range control, it is difficult
In the seamless interfacing of realization and electric-control system.And existing electro-hydraulic proportional throttle valve, standard two-way plug-in unit is generallyd use as master
The valve port opening of valve grade, the control of spool unit displacement changes greatly, simultaneously because the structural factor of valve port, leads to hydraulic power and throttling
Index variation is also very big, and the dead zone for allowing for control in this way is big, and the adjustment time for controlling dynamic response is long, quick high accuracy
It is difficult in control system；Simultaneously as using common two-way plug-in unit as main valve grade, so that the driving force mode of control
For passive matrix, when controlled stage failure, the entire valve port standard-sized sheet of main valve grade easily leads to the damage of host system；Therefore
Existing electro-hydraulic proportional throttle valve has certain limitation range in actual use.It follows that as hydraulic device is to integrated level
It is required that higher and higher, more and more to equipment automatization and intelligentized demand for control, existing throttle valve is difficult to meet demand,
It is more more and more urgent to high-precision, high integration, the demand of the reliable throttle valve of high safety.
Summary of the invention
The present invention provides a kind of electro-hydraulic proportional throttle valve and its control for above-mentioned technical problem existing for existing throttle valve
Method processed.
To achieve the above object, the technical solution of the invention is as follows: a kind of electro-hydraulic proportional throttle valve, including displacement sensing
Device, valve pocket, proportional reversing valve, main valve plug, valve body, inlet pressure sensor, outlet pressure sensor, switch reversal valve, main valve
Lid and operational amplifying module, the main valve lid are mounted on valve body, and the inner cavity of main valve lid and the inner cavity of valve body are corresponding, described
Valve body lower portion is provided with the through-hole I and through-hole II being connected with its inner cavity, and the valve pocket and main valve plug are hollow cylinder
Shape structure, the valve pocket are mounted in body cavity, and the main valve plug is nested in valve pocket, and main valve plug top be located in
In main valve cover cavity, the axle center of valve pocket and the axle center of main valve plug are coaxial, and the displacement sensor lower part is mounted in main valve plug,
Displacement sensor top is mounted in main valve cover cavity, and the through-hole I on the valve body is connected with the inner hole of main valve plug, described
A mouthfuls of arrival end of through-hole I are the oil inlet of this throttle valve, and the through-hole II on valve body is connected with the cylindrical hole on valve pocket, through-hole
Outlet end B mouthfuls of II is the oil outlet of this throttle valve, and for monitoring A mouthfuls of pressure, described goes out the inlet pressure sensor
Mouth pressure sensor is provided with shoulder in the middle part of the main valve plug periphery, is provided on the shoulder for monitoring B mouthfuls of pressure
Sealing ring VI forms shoulder upper oil cavitie, the main valve plug and valve pocket of shoulder lower part between the main valve plug and valve pocket inner cavity on shoulder top
Shoulder lower oil cavitie is formed between inner cavity, the proportional reversing valve is 3-position 4-way ratio solenoid directional control valve, the proportional reversing valve
Two oilholes be connected respectively with shoulder upper oil cavitie, shoulder lower oil cavitie, it is described switch reversal valve two oilholes respectively with platform
Shoulder upper oil cavitie, shoulder lower oil cavitie are connected, and sealing ring VII, the position are provided between the main valve plug top and main valve lid
Sensor cavity is formed between displacement sensor and main valve cover cavity, passes through the inner hole of main valve plug between the sensor cavity and through-hole I
Gap between displacement sensor is connected, the displacement sensor, proportional reversing valve, inlet pressure sensor, outlet
Pressure sensor, switch reversal valve are electrically connected with operational amplifying module respectively.
The displacement sensor is mounted in main valve lid by sensor seal cover.
The displacement sensor is mounted on magnetic ring mounting base by displacement sensor reaction magnetic ring, the magnet ring peace
Dress seat is fixed on main valve plug.
The proportional reversing valve is mounted on valve body, and the switch reversal valve is mounted on valve body, the import
Pressure sensor is mounted on valve body.
It further include having transition block, the transition block is mounted on valve body, and the outlet pressure sensor was mounted on
It crosses on block.
A kind of control method of electro-hydraulic proportional throttle valve, includes the steps that following: step 1, determines that this electric-hydraulic proportion throttles
The restriction coefficient C (X) that valve is displaced in different main valve plugs；Step 2 determines main valve plug in the valve port area A (X) of different displacements；Step
Rapid three, according to inlet pressure sensor and outlet pressure sensor determine this electro-hydraulic proportional throttle valve inlet and outlet pressure PX1 and
PX2；Step 4 determines the overcurrent flow of its valve port of main valve plug position X in office according to the parameter that step 1 to step 3 obtains
Are as follows:Step 5, the value range corresponding [0, Q of automatically controlled driving signal R signal electric current
(X) max], after given specific automatically controlled driving signal R electric current, operational amplifying module gives target flow: Q (x) is led at this time
The displacement X of spool is gradually increased, the C of the displacement X of operational amplifying module real-time operation and monitoring acquisition corresponding position main valve plug
(x), A (x), PX1, PX2 obtain Q (x) ' according to four operation of above-mentioned steps；Operational amplifying module is according to operation result to given
The actual flow that target flow and operation obtain is compared, and as Q (x)-Q (x) '≤Δ q, operational amplifying module remains current
State；When the displacement X of operation result Q (x)-Q (x) ' >=Δ q, operational amplifying module control bound core continue to incrementally increase, until
Close to target flow；As Q (x)-Q (x) '≤- Δ q, the displacement X of system call interception main valve plug is gradually reduced, until close to target stream
Amount；ρ in above-mentioned steps three, step 4 and step 5 is the density of medium, and Δ q is the given margin of error.
Compared with prior art, the beneficial effects of the present invention are:
This electric-hydraulic proportion closed-loop control throttle valve control precision by load and flow system flow influenced it is small, control oil sources failure
When main valve plug valve port close entirely, guarantee the safety of host system；Controlling dead error is small, meets current hydraulic device to integrated level requirement
It is higher and higher, to equipment automatization and intelligentized demand for control.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention.
Fig. 2 is housing configuration schematic diagram in the present invention.
Fig. 3 is main valve plug structural schematic diagram in the present invention.
Fig. 4 is hydraulic schematic diagram of the present invention.
In figure, displacement sensor 1, sensor seal cover 2, displacement sensor reaction magnetic ring 3, magnetic ring mounting base 4, sealing ring
I 5, valve pocket 6, sealing ring II 7, proportional reversing valve 8, sealing ring III 9, main valve plug 10, sealing ring IV 11, valve body 12, inlet pressure
Sensor 13, transition block 14, V 15,16 sealing ring VI of sealing ring, outlet pressure sensor 17, sealing ring VII 18, switch commutation
Valve 19, main valve lid 20, operational amplifying module 21, cylindrical hole 22, through-hole I 23, through-hole II 24, shoulder 25.
Specific embodiment
Below in conjunction with Detailed description of the invention and specific embodiment, the present invention is described in further detail.
Referring to Fig. 1 to Fig. 3, a kind of electro-hydraulic proportional throttle valve, including displacement sensor 1, valve pocket 6, proportional reversing valve 8, master
Spool 10, valve body 12, inlet pressure sensor 13, outlet pressure sensor 17, switch reversal valve 19, main valve lid 20 and operation are put
Big module 21.
Referring to Fig. 1 to Fig. 3, the main valve lid 20 is mounted on valve body 12, the inner cavity of main valve lid 20 and valve body 12 it is interior
Chamber is corresponding, and 12 lower part of valve body is provided with the through-hole I 23 and through-hole II 24 being connected with its inner cavity.6 He of valve pocket
Main valve plug 10 is hollow cylindrical structure, and the valve pocket 6 is mounted in 12 inner cavity of valve body, and the main valve plug 10 is nested with
In valve pocket 6, and 10 top of main valve plug is located in 20 inner cavity of main valve lid；The axle center of valve pocket 6 and the axle center of main valve plug 10 are coaxial,
That is valve pocket 6 and main valve plug 10 is made into concentric cylindrical structure.1 lower part of displacement sensor is mounted in main valve plug 10, position
1 top of displacement sensor is mounted in 20 inner cavity of main valve lid.
Referring to Fig. 1 to Fig. 3, the 6 lower part surrounding of valve pocket is disposed with multiple rows of cylindrical hole 22, the axis of multiple rows of cylindrical hole 22
Line is each perpendicular to 6 axial line of valve pocket.Through-hole I 23 on the valve body 12 is connected with the inner hole of main valve plug 10, the through-hole I
A mouthfuls of arrival end of 23 are the high pressure oil-in of this throttle valve；Through-hole II 24 on valve body 12 is connected with the cylindrical hole 22 on valve pocket 6
Logical, outlet end B mouthfuls of through-hole II 24 is the high pressure oil export of this throttle valve.The inlet pressure sensor 13 is for monitoring A
Mouth pressure, the outlet pressure sensor 17 is for monitoring B mouthfuls of pressure.Shoulder is provided in the middle part of 10 periphery of main valve plug
25, sealing ring VI 16 is provided on the shoulder 25, forms shoulder between 6 inner cavity of main valve plug 10 and valve pocket on 25 top of shoulder
Upper oil cavitie forms shoulder lower oil cavitie between 6 inner cavity of main valve plug 10 and valve pocket of 25 lower part of shoulder.Sealing ring VI 16 is used to that platform is isolated
The shoulder upper oil cavitie and shoulder lower oil cavitie of about 25 shoulder, when work, two oil pockets, one chamber be high pressure, one be low pressure.Institute
Two oilholes for stating proportional reversing valve 8 are connected with shoulder upper oil cavitie, shoulder lower oil cavitie respectively, and the two of the switch reversal valve 19
A oilhole is connected with shoulder upper oil cavitie, shoulder lower oil cavitie respectively.Shape between 20 inner cavity of displacement sensor 1 and main valve lid
At sensor cavity, pass through the gap between the inner hole and displacement sensor 1 of main valve plug 10 between the sensor cavity and through-hole I 23
It is connected.Sealing ring VII 18 is provided between 10 top of main valve plug and main valve lid 20, sealing ring VII 18 is for being isolated platform
The oil liquid of shoulder upper oil cavitie and sensor cavity.The displacement sensor 1, proportional reversing valve 8, inlet pressure sensor 13, outlet
Pressure sensor 17, switch reversal valve 19 are electrically connected with operational amplifying module 21 respectively.
Referring to Fig. 1 to Fig. 4, the proportional reversing valve 8 is the 3-position 4-way ratio solenoid directional control valve of the O-shaped function in middle position,
The operating position of proportional reversing valve 8 obtains electricity condition according to its proportion electro-magnet DT2, DT3 and is selected that (DT2 and DT3 cannot be simultaneously
It obtains electric)；By controlling the aperture of 10 valve port of size of current control bound core of DT2/DT3, and then control the control oil sources x of high pressure
Into the uninterrupted of 25 cavitys of the shoulder of main valve plug 10d, so that the up and down motion of main valve plug 10 is driven, as shown in Figure 4: when
When being in standby, the high pressure oil of the control oil sources x of high pressure can not can only pass through electromagnetic switch valve by proportional reversing valve 8
19, the shoulder on 25 top of shoulder that high pressure fuel source x will be introduced into main valve plug 10 by the access that electromagnetic switch valve 19 is defaulted oils
Chamber, while making the shoulder lower oil cavitie of 25 lower part of shoulder of main valve plug 10 and the hydraulic circuit connection of oil return box, it is therefore provided that main valve
Core 10 closes primary spools 10 by hydraulic coupling downward always.When wanting control bound core 10 to open, electromagnetic switch at this time
Valve 19 can be connected to signal make its electromagnet DT1 obtain it is electric, simultaneously DT3 obtain it is electric, can thus make the control oil sources xX of high pressure without
High pressure oil can be introduced the shoulder of 25 lower part of shoulder of main valve plug 10 by electromagnetic switch valve 19 by method by proportion magnetic valve 8
Lower oil cavitie, while the hydraulic oil in the shoulder upper oil cavitie on 25 top of the shoulder of main valve plug 10 and the low pressure oil way of oil return box being joined
It is logical, make primary spools 10 by upward driving force, so open main valve plug 10.The movement of main valve plug 10 will lead to main valve plug
The variation of 10 displacements；When detecting that movement deviates, automatically switch DT3 to DT2, similarly, main valve plug 10 will move down.This
The setting of sample makes the movement of primary spools 10 form a closed loop proportional valve control and with Displacement Feedback by shoulder 25
The servo-cylinder of control is capable of the aperture of accurately 10 primary valve of control bound core.
Referring to Fig. 1 to Fig. 3, the displacement sensor 1 is mounted in main valve lid 20 by sensor seal cover 2.
Referring to Fig. 1 to Fig. 3, the displacement sensor is nested with 1 and is mounted on magnet ring peace by displacement sensor reaction magnetic ring 3
It fills on seat 4, the magnetic ring mounting base 4 is fixed on main valve plug 10.
Referring to Fig. 1 to Fig. 3, the proportional reversing valve 8, switch reversal valve 19 and inlet pressure sensor 13 are installed in
On valve body 12.
Referring to Fig. 1 to Fig. 3, this throttle valve further includes having transition block 14, and transition block 14 is for drawing B mouthfuls；The transition
Block 14 is mounted on valve body 12, and the outlet pressure sensor 17 is mounted in transition block 14.
Referring to Fig. 1 to Fig. 4, main valve plug 10 and valve pocket 6, valve body 12, sealing ring VI 16, sealing ring VII 18 are filled in this throttle valve
After cooperation, the shoulder 25 being arranged on main valve plug 10 then constitutes a hydraulic servo oil cylinder；The hydraulic servo oil cylinder and main valve
Core 10 is an integral structure, therefore the moving displacement for controlling entire hydraulic servo oil cylinder also just controls opening for 10 valve port of main valve plug
Mouth degree；And the proportional reversing valve 8 and switch being arranged in the control mouth for the hydraulic servo oil cylinder that control bound core 10 is displaced change
To the moving displacement of 19 control bound core 10 of valve.Since main valve plug 10 uses hollow structure, passed by displacement sensor 1 and displacement
Sensor reaction magnetic ring 3 can be achieved with the feedback being displaced in real time to main valve plug 10, therefore displacement sensor 1 can monitor in real time and instead
Present position and the motion state of main valve plug 10.Meanwhile it is the ratio in the feedback signal of displacement sensor 1, proportional reversing valve 8 is electric
Electromagnet DT1 input signal in magnet DT3, DT2 input signal, switch reversal valve 19 is transported by operational amplifying module 21
It calculates and compares, realize the closed-loop control output and input.Also, due to the top that A mouthfuls of hydraulic oil is introduced to main valve plug 10, make
Top A mouth pressure oil pressure active area be slightly larger than bottom A mouthfuls of main valve plug 10 pressure oil pressure active area, therefore
So that for main valve plug 10 always by the axial force closed, system pressure is higher when the failure of control oil sources or cutting, close more
Reliably, it forces main valve plug 10 to be closed, ensure that equipment occurs itself safety under oil sources failure conditions in control system.
Make primary spools 10 in valve because the axis of multiple rows of cylindrical hole 22 is each perpendicular to 6 axial line of valve pocket referring to Fig. 1 to Fig. 4
When moving up and down in set 6, forms main valve plug 10 and constantly change the quantity for covering cylindrical hole 22, form the flow area of this throttle valve
Displacement with main valve plug 10 is at specific functional relation.And B mouthfuls of fluid is flowed to by A mouthfuls, it is finally the cylinder by valve pocket 6
Hole 22 is flowed out, the variation for 22 quantity of size Correspondent cy linder hole that main valve plug 10 is displaced, due to the fluid flowed out by cylindrical hole 22
Directional velocity and main valve plug 10 the direction of motion at 90 degree so that hydraulic power is minimum, maximally reduced hydraulic power pair
The interference of the movement of main valve plug 10；And the through-flow duct of reality that fluid flows through is similar cylindrical hole 22, therefore is flowed through to fluid
The discharge coefficient of through-flow inner area is also similar, so that restriction coefficient is stablized, so whole discharge coefficient is relatively stable.
Referring to Fig. 1 to Fig. 4, this electro-hydraulic proportional throttle valve, 10 valve port of main valve plug closes full when realizing control oil sources failure, protects
The safety of host system is demonstrate,proved；Meanwhile being designed by special valve mouth structure, realize the displacement of main valve plug 10 liquid in change procedure
The influence of power and the variation of restriction coefficient realize lesser dead zone and high-precision, high safety in lesser range, can be long-range
Closed loop electrification control；Meet current hydraulic device to integrated level require it is higher and higher, to equipment automatization and intelligentized
The more and more demands of demand for control, and then meet to high-precision, high integration, the reliable closed-loop control throttle valve of high safety
The more more and more urgent requirement of demand.To solve current proportional throttle valve control precision by the flowed fluctuation shadow of load and system
The valve port opening for ringing serious, spool unit displacement control changes problem greatly；The structural factor due to valve port is avoided simultaneously
Hydraulic power and restriction coefficient is caused to change greatly, so that the dead zone of control is big, the adjustment time of control dynamic response is long, quickly high-precision
It is difficult in the control system of degree, the entire valve port standard-sized sheet of main valve grade easily leads to host system when controlled stage failure
The problems such as damage.
Referring to Fig. 1 to Fig. 4, a kind of control method of electro-hydraulic proportional throttle valve, when this throttle valve works, high pressure oil is at A mouthfuls
Await orders, automatically controlled driving signal R (flow control) and this throttle valve high pressure oil import and export A mouthfuls and B mouthfuls pressure live signal PX1 and
PX2, displacement sensor 1 displacement sensing signal DX1 by operational amplifying module 21 by the way that after specific sequential operation, control is opened
The electromagnet DT1 closed in reversal valve 19 is closed, while proportion electro-magnet DT2 and the DT3 work in proportional reversing valve 8, according to R mouthfuls
Input signal, control flow from 0 to the stepless control maximum stream flow, to realize the whole process of this throttle valve control process
Closed loop is not influenced by load pressure.The control method of this specific electro-hydraulic proportional throttle valve includes the steps that following:
Step 1 determines the section that this electro-hydraulic proportional throttle valve is displaced in different main valve plugs 10 according to theoretical and actual measurement
It flows coefficient C (X).
Step 2 determines main valve plug 10 in the valve port area A (X) of different displacements according to the measurement that structure designs.
Step 3, according to inlet pressure sensor 13 and outlet pressure sensor 17 determine this electro-hydraulic proportional throttle valve into
Outlet pressure PX1 and PX2.
Step 4 determines the mistake of 10 position X in office its valve port of this main valve plug according to the parameter that step 1 to step 3 obtains
Flow flow are as follows:
The value range of step 5, automatically controlled driving signal R signal electric current is corresponding [0, Q (X) max], when given specific electricity
After controlling driving signal R electric current, operational amplifying module 21 gives target flow: Q (x), and the displacement X of main valve plug 10 gradually increases at this time
Greatly, 21 real-time operation of operational amplifying module and monitoring obtain the displacement C (x) of X of corresponding position main valve plug 10, A (x), PX1,
PX2 obtains Q (x) ' according to four operation of above-mentioned steps.
Operational amplifying module 21 compares according to the actual flow that operation result obtains given target flow and operation
Compared with as Q (x)-Q (x) '≤Δ q, operational amplifying module 21 maintains current state；As operation result Q (x)-Q (x) ' >=Δ q,
The displacement X of 21 control bound core 10 of operational amplifying module continues to incrementally increase, until close to target flow；As Q (x)-Q (x) '
The displacement X of≤- Δ q, system call interception main valve plug 10 are gradually reduced, until close to target flow.
ρ in above-mentioned steps three, step 4 and step 5 is the density of medium, and Δ q is the given margin of error.
Referring to Fig. 1 to Fig. 4, from the foregoing, it will be observed that sealing and through-flow is realized in the cooperation in the present invention by valve pocket 6 and main valve plug 10
The change of area.6 side of valve pocket opens up the flow area that large number of cylindrical hole 22 meets valve member as throttling pore, when
When 10 area of main valve plug changes, the flow area of valve member is realized by the change of most of the same or similar 22 quantity of cylindrical hole
The stabilization of 10 valve port restriction coefficient of main valve plug is realized in the change of circulation area；Simultaneously because these cylindrical holes 22 are perpendicular to main valve
The direction of motion of core 10, so the effect of hydraulic power also substantially weakens, the control for being conducive to main valve plug 10 is stablized.In main valve plug 10
Sky, and the shoulder 25 on main valve plug 10, the shoulder 25 and valve pocket 6 and main valve lid 20 together constitute a hydraulic cylinder, control
The up and down motion of the oil cylinder, can control bound core 10 movement；The movement for controlling the oil cylinder is passed through into external oil sources and setting
Special valve member is realized, so not only ensure that the stabilization that main valve plug 10 controls, but also can realize the independence of control；Simultaneously because main
Spool 10 it is hollow, the oil liquid of valve member import is introduced into 10 top of main valve plug, when the failure of the control oil sources of main valve plug 10, import
Oil pressure main valve plug 10 will be made to close always, guarantee the safety of equipment.For optimal control, by the displacement of main valve plug 10, this section
The inlet and outlet pressure and the corresponding restriction coefficient of corresponding spool displacement for flowing valve are associated by flow equation, by setting
Corresponding operational amplifying module 21 is set, closed-loop control is carried out by setting program, on the one hand realizes valve member open and close electricity ratio
Example control, on the other hand also greatly improved control precision.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, and above structure all shall be regarded as belonging to
Protection scope of the present invention.
Claims (6)
1. a kind of electro-hydraulic proportional throttle valve, it is characterised in that: including displacement sensor (1), valve pocket (6), proportional reversing valve (8),
Main valve plug (10), valve body (12), inlet pressure sensor (13), outlet pressure sensor (17), switch reversal valve (19), main valve
Lid (20) and operational amplifying module (21), the main valve lid (20) be mounted on valve body (12), the inner cavity of main valve lid (20) with
The inner cavity of valve body (12) is corresponding, and valve body (12) lower part is provided with the through-hole I (23) and through-hole II being connected with its inner cavity
(24), the valve pocket (6) and main valve plug (10) are hollow cylindrical structure, and the valve pocket (6) is mounted on valve body
(12) in inner cavity, the main valve plug (10) is nested in valve pocket (6), and main valve plug (10) top is located in main valve lid (20)
In chamber, the axle center of valve pocket (6) and the axle center of main valve plug (10) are coaxial, and described displacement sensor (1) lower part is mounted on main valve plug
(10) in, displacement sensor (1) top is mounted in main valve lid (20) inner cavity, the through-hole I (23) on the valve body (12) with
The inner hole of main valve plug (10) is connected, A mouthfuls of the arrival end oil inlets for this throttle valve of the through-hole I (23), on valve body (12)
Through-hole II (24) be connected with the cylindrical hole (22) on valve pocket (6), outlet end B mouthfuls of through-hole II (24) going out for this throttle valve
Hydraulic fluid port, the inlet pressure sensor (13) is for monitoring A mouthfuls of pressure, and the outlet pressure sensor (17) is for monitoring
B mouthfuls of pressure, the main valve plug (10) periphery middle part are provided with shoulder (25), and the shoulder is provided with sealing ring VI on (25)
(16), shoulder upper oil cavitie, the master of shoulder (25) lower part are formed between the main valve plug (10) on shoulder (25) top and valve pocket (6) inner cavity
Shoulder lower oil cavitie is formed between spool (10) and valve pocket (6) inner cavity, the proportional reversing valve (8) is that 3-position 4-way ratio electromagnetism changes
To valve, two oilholes of the proportional reversing valve (8) are connected with shoulder upper oil cavitie, shoulder lower oil cavitie respectively, and the switch changes
It is connected respectively with shoulder upper oil cavitie, shoulder lower oil cavitie to two oilholes of valve (19), the main valve plug (10) top and master
It is provided with sealing ring VII (18) between valve deck (20), is formed and is passed between the displacement sensor (1) and main valve lid (20) inner cavity
Sensor chamber, between passing through between the inner hole and displacement sensor (1) of main valve plug (10) between the sensor cavity and through-hole I (23)
Gap is connected, the displacement sensor (1), proportional reversing valve (8), inlet pressure sensor (13), outlet pressure sensor
(17), switch reversal valve (19) is electrically connected with operational amplifying module (21) respectively.
2. a kind of electro-hydraulic proportional throttle valve according to claim 1, it is characterised in that: the displacement sensor (1) is logical
Sensor seal cover (2) is crossed to be mounted in main valve lid (20).
3. a kind of electro-hydraulic proportional throttle valve according to claim 1, it is characterised in that: the displacement sensor (1) is logical
It crosses displacement sensor reaction magnetic ring (3) to be mounted on magnetic ring mounting base (4), the magnetic ring mounting base (4) is fixed on main valve plug
(10) on.
4. a kind of electro-hydraulic proportional throttle valve according to claim 1, it is characterised in that: proportional reversing valve (8) peace
On valve body (12), the switch reversal valve (19) is mounted on valve body (12), the inlet pressure sensor (13)
It is mounted on (12) valve body.
5. a kind of electro-hydraulic proportional throttle valve according to claim 1, it is characterised in that: further include having transition block (14), institute
The transition block (14) stated is mounted on valve body (12), and the outlet pressure sensor (17) is mounted on transition block (14).
6. a kind of control method of electro-hydraulic proportional throttle valve, which is characterized in that include the steps that following:
Step 1 determines the restriction coefficient C (X) that this electro-hydraulic proportional throttle valve is displaced in different main valve plugs (10)；
Step 2 determines main valve plug (10) in the valve port area A (X) of different displacements；
Step 3, according to inlet pressure sensor (13) and outlet pressure sensor (17) determine this electro-hydraulic proportional throttle valve into
Outlet pressure PX1 and PX2；
Step 4 determines the overcurrent stream of its valve port of main valve plug (10) position X in office according to the parameter that step 1 to step 3 obtains
Amount are as follows:
The value range of step 5, automatically controlled driving signal R signal electric current is corresponding [0, Q (X) max], when given specific automatically controlled drive
After dynamic signal R electric current, operational amplifying module (21) gives target flow: Q (x), the displacement X of main valve plug (10) gradually increases at this time
Greatly, operational amplifying module (21) real-time operation and monitoring obtain the displacement C (x) of X of corresponding position main valve plug (10), A (x),
PX1, PX2 obtain Q (x) ' according to four operation of above-mentioned steps；
Operational amplifying module (21) is compared according to the actual flow that operation result obtains given target flow and operation,
As Q (x)-Q (x) '≤Δ q, operational amplifying module (21) maintains current state；When operation result Q (x)-Q (x) ' >=Δ q, fortune
The displacement X for calculating amplification module (21) control bound core (10) continues to incrementally increase, until close to target flow；As Q (x)-Q (x) '
The displacement X of≤- Δ q, system call interception main valve plug (10) are gradually reduced, until close to target flow；
ρ in above-mentioned steps three, step 4 and step 5 is the density of medium, and Δ q is the given margin of error.
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| CN113309752A (en) * | 2021-06-03 | 2021-08-27 | 深圳市浦联智能科技有限公司 | Proportional valve hydraulic control system |
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| CN109372813B (en) | 2020-05-08 |
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