CN110374945A - A kind of load-sensitive valve module and load sensitive system - Google Patents
A kind of load-sensitive valve module and load sensitive system Download PDFInfo
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- CN110374945A CN110374945A CN201910672500.2A CN201910672500A CN110374945A CN 110374945 A CN110374945 A CN 110374945A CN 201910672500 A CN201910672500 A CN 201910672500A CN 110374945 A CN110374945 A CN 110374945A
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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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to hydraulic system technical field, specifically disclosing a kind of load-sensitive valve module and load sensitive system, load-sensitive valve module includes: main valve, is set to the open and close on oil inlet oil duct and for controlling oil inlet oil duct；Pressure-compensated valve, including the first spool, first oil inlet and the first oil outlet, and it is located at the first control oil pocket and the second control oil pocket at the first spool both ends, oil inlet oil duct is connected to the first control oil pocket and the first oil inlet respectively, first oil inlet can be connected to the first oil outlet, and the first oil outlet can be connected to the driving hydraulic fluid port of loading cylinders；Shuttle valve, it is set in the first spool, driving hydraulic fluid port can be connected to by shuttle valve with the second control oil pocket, and oil inlet oil duct can pass through shuttle valve and sensitive oil communication, spool is set in the spool of pressure-compensated valve, the length of fluid pressure line between the two can be reduced, crushing is reduced, improve the feedback efficiency and precision of load.Load sensitive system includes above-mentioned load-sensitive valve module.
Description
Technical field
The present invention relates to hydraulic system technical field more particularly to a kind of load-sensitive valve modules and load sensitive system.
Background technique
Hydraulic system is to influence the construction machinery products performances such as autocrane, excavator, rotary drilling rig, concrete mixer
Important component, due to general all there are two above executing agency in these construction machinery products, and each executing agency
It loads different, it is ensured that when more than two executing agency's composite moves, be not in that the big speed of load is slow, load small
Speed this phenomenon fastly, is widely used load sensitive system.
Load sensitive system multi-pass is crossed shuttle valve and is compared come the maximum load pressure signal to executing agency, and automatically
The load-sensitive chamber that a biggish load pressure signal is transferred to load sensitive pump by feeding back oil circuit, and then control variable
The pivot angle of pump makes hydraulic pump only provide flow required for executing agency, to reduce the energy loss of system；Due to load-sensitive
Pressure-compensated valve in system can make pressure difference before and after reversal valve remain a steady state value, and therefore, the speed of executing agency is only with changing
Opening degree to valve is related, and unrelated with the load of executing agency, ensure that harmony when executing agency's composite move.
In the related technology, such as application No. is disclose a kind of positive control load the early period of CN201721606189.4 in patent
Sensory system, application No. is the early periods of CN201320165642.8 to disclose a kind of load sensitive system in patent, to load
Sensory system is expounded, and in load sensitive system, load pressure selects highest load pressure by shuttle valve, passes through hydraulic tube
Road acts on the stroking mechanism of pump, and then controller output pressure and load are adapted, however, in existing load sensitive system
Each valve (shuttle valve, pressure-compensated valve and main valve) usually split settings on valve seat, to need to process for different valves
Oilhole is installed, and since each valve needs to cooperate, needs the design on valve seat to flow through channel accordingly, this results in bearing
Carry sensory system during the work time, the pressure loss of pipeline is larger, causes load feedback signal retardation larger and feeds back
Precision is lower.
Summary of the invention
It is an object of the invention to: a kind of load-sensitive valve module and load sensitive system are provided, to solve the prior art
Each valve fission of middle load sensitive system designs, and the pressure loss of pipeline is larger in the course of work of load sensitive system,
Lead to the problem that load feedback signal retardation is larger, feedback accuracy is low.
On the one hand, the present invention provides a kind of load-sensitive valve module, which includes:
Main valve is set on oil inlet oil duct, and the main valve is used to control the open and close of the oil inlet oil duct；
Pressure-compensated valve, including the first spool, the first oil inlet and the first oil outlet, and it is located at first valve
The first control oil pocket at core both ends and the second control oil pocket, the oil inlet oil duct can control oil pocket and institute with described first respectively
The connection of the first oil inlet is stated, first oil inlet can be connected to first oil outlet, and first oil outlet can be with
The driving hydraulic fluid port of loading cylinders is connected to；
Shuttle valve is set in first spool, and the driving hydraulic fluid port can pass through the shuttle valve and second control
Oil pocket connection, and the oil inlet oil duct can pass through the shuttle valve and sensitive oil communication.
As the preferred embodiment of load-sensitive valve module, the shuttle valve includes that first be set in first spool is held
Receive chamber, the second spool being set in first accommodating chamber, and be all set in the first accommodating chamber cavity wall second
Oil inlet, third oil inlet, the second oil outlet and third oil outlet, the oil inlet oil duct can pass through throttling passage and described the
The connection of two oil inlets, second oil outlet can be with the sensitive oil communications, and the third oil inlet can be with the drive
Dynamic hydraulic fluid port connection, the third oil outlet are connected to the second control oil pocket, and second oil inlet can be with described second
Oil outlet connection, and the third oil inlet can be connected to the third oil outlet.
As the preferred embodiment of load-sensitive valve module, first accommodating chamber includes being located at second spool both ends
Third controls oil pocket and the 4th control oil pocket, and first spool is equipped with the first oil duct and the second oil duct, first oil duct
Be connected to the oil inlet oil duct and second oil inlet, and first oil duct can by the hydraulic oil throttling of process, described second
Oil inlet can control oil pocket with the third and be connected to, and the third controls oil pocket and is connected to second oil outlet, and described the
Two oil ducts are connected to the third oil inlet and the 4th control oil pocket, and the 4th control oil pocket can be fuel-displaced with the third
Mouth connection.
As the preferred embodiment of load-sensitive valve module, second spool has first position, when second spool
When positioned at the first position, the third control oil pocket be connected to second oil inlet, and the 4th control oil pocket and
The third oil outlet connection.
As the preferred embodiment of load-sensitive valve module, second spool also has the second position, when second valve
When core is located at the second position, second oil inlet is blocked by second spool, and second spool is by described
Four control oil pockets and the third oil outlet separate, and second oil outlet is connected to the third oil outlet.
As the preferred embodiment of load-sensitive valve module, second spool includes valve rod and is respectively arranged at the valve rod
First accommodating chamber is divided into the third control oil pocket and the 4th control oil by the piston at both ends, two pistons
Chamber, and positioned at the third control oil pocket and the 4th control oil pocket between intermediate oil pocket, two pistons with it is described
The cavity wall of first accommodating chamber is sealed and is slidably matched, and the valve rod, which is equipped with, is connected to the third control oil pocket and the middle oil
The third oil duct of chamber, the intermediate oil pocket is connected to second oil outlet and can be connected to the third oil outlet, along institute
State the extending direction of the first accommodating chamber, the third control oil pocket, second oil inlet, second oil outlet, described the
Three oil outlets and the 4th control oil pocket are set gradually；
When second spool is located at the first position, a piston is located at second oil inlet and described
Third controls between oil pocket, another described piston is between second oil outlet and the third oil outlet；When described
When second spool is located at the second position, a piston blocks second oil inlet, another described piston position
Between the third oil outlet and the 4th control oil pocket.
As the preferred embodiment of load-sensitive valve module, the pressure-compensated valve further includes the second accommodating chamber, and described first
Spool is located in second accommodating chamber, and the outer peripheral surface of first spool is equipped with annular groove, the third oil outlet with it is described
Annular groove is connected to, and the 4th oil duct is additionally provided on first spool, and the 4th oil duct is connected to the annular groove and second control
Oil pocket.
As the preferred embodiment of load-sensitive valve module, second accommodating chamber is set on the main valve plug of the main valve,
The first control oil pocket and the second control oil pocket are located at the both ends of second accommodating chamber, first oil inlet
It is all set on the main valve plug with first oil outlet, first oil inlet and first oil outlet are with described
One control oil pocket connection, the main valve plug, which is additionally provided with, to be exported with the first output oil port and second of the sensitive oil communication
Hydraulic fluid port, first output oil port be connected to second oil outlet and can with can the sensitive oil communication, described the
Two output oil ports are connected to the third oil inlet and can be connected to the driving hydraulic fluid port.
As the preferred embodiment of load-sensitive valve module, the main valve plug has open position and closed position, when described
When main valve plug is located at the open position, first oil inlet is connected to the oil inlet oil duct, first oil outlet and institute
It states the second output oil port to be connected to the driving hydraulic fluid port, first output oil port and the sensitive oil communication；When described
When main valve plug is located at the closed position, first oil inlet and the oil inlet oil duct are disconnected, first oil outlet and institute
It states the second output oil port to disconnect with the driving hydraulic fluid port, first output oil port and the sensitive oil circuit disconnect.
As the preferred embodiment of load-sensitive valve module, the pressure-compensated valve further includes being set to the second control oil
Intracavitary pressure spring, the both ends of the pressure spring are abutted with the cavity wall of first spool and second accommodating chamber respectively.
On the other hand, the present invention provides a kind of load sensitive system, including load-sensitive described in any above scheme
Valve module, the load sensitive system further include:
Variable pump, the variable pump can be connected to oil sump and oil inlet oil duct；
Sensitive oil circuit is connect with the proportional reversing valve of the variable pump, and the swash plate angle for controlling the variable pump；
The driving hydraulic fluid port of loading cylinders, the loading cylinders can be connected to the first oil outlet.
As the preferred embodiment of load sensitive system, the quantity of the load-sensitive valve module and the loading cylinders is
It is multiple, and multiple load-sensitive valve modules connect one to one with multiple loading cylinders, multiple oil inlet oil ducts
It is connected to main oil inlet oil duct, the main oil inlet oil duct is connected to the output end of the variable pump.
As the preferred embodiment of load sensitive system, the load sensitive system further includes and the sensitive oil circuit connection
Total overflow valve.
The invention has the benefit that
The present invention provides a kind of load-sensitive valve module, which includes main valve, pressure-compensated valve and shuttle
Valve.Main valve is set on oil inlet oil duct, and main valve is used to control the open and close of oil inlet oil duct, and oil inlet oil duct and variable pump connect
It connects；Pressure-compensated valve includes the first spool, the first oil inlet and the first oil outlet, and is located at the of the first spool both ends
One control oil pocket and the second control oil pocket, oil inlet oil duct are connected to the first control oil pocket and the first oil inlet respectively, the first oil inlet
Mouth can be connected to the first oil outlet, and the first oil outlet can be connected to the driving hydraulic fluid port of loading cylinders；Shuttle valve is set to first
In spool, driving hydraulic fluid port can be connected to by shuttle valve with the second control oil pocket, and oil inlet oil duct can pass through shuttle valve and sensitivity oil
Road connection.By the way that shuttle valve to be set in the spool of pressure-compensated valve, compared with prior art, shuttle valve and pressure can be effectively reduced
The length of fluid pressure line between recuperation valve reduces the pressure loss, improves the feedback efficiency and feedback accuracy of load.
The present invention provides a kind of load sensitive system, and variable pump is connect with above-mentioned load-sensitive valve module, load-sensitive system
System connect with loading cylinders and with sensitive oil circuit connection, sensitive oil circuit is used to connect with the proportional reversing valve of variable pump, and be used for
Control the swash plate angle of variable pump.By being integrated in shuttle valve in the spool of pressure-compensated valve, the length of fluid pressure line is shortened,
The pressure loss of hydraulic oil reduces, and improves the stability of system.
Detailed description of the invention
Fig. 1 is the schematic diagram of load-sensitive valve module in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of load-sensitive valve module in the embodiment of the present invention；
Fig. 3, which cuts open for load-sensitive valve module in Fig. 2 along the part in the direction A-A, shows expanded view；
Fig. 4, which cuts open for load-sensitive valve module in Fig. 2 along the part in the direction B-B, shows expanded view；
Fig. 5, which cuts open for load-sensitive valve module in Fig. 2 along the part in the direction C-C, shows expanded view；
Fig. 6 is load-sensitive valve module in Fig. 2 along the cut-away view in the direction D-D.
In figure:
1, main valve；11, main valve plug；111, the first output oil port；112, the second output oil port；12, main valve seat；
2, pressure-compensated valve；21, the first spool；211, the first oil duct；212, the second oil duct；213, the 4th oil duct；214,
Annular groove；22, the first oil inlet；23, the first oil outlet；24, the second accommodating chamber；241, the first control oil pocket；242, the second control
Oil pocket；25, pressure spring；
3, shuttle valve；31, the second spool；311, valve rod；312, piston；321, third controls oil pocket；322, the 4th control oil
Chamber；323, intermediate oil pocket；33, the second oil inlet；34, third oil inlet；35, the second oil outlet；36, third oil outlet；37,
Three oil ducts；
4, oil inlet oil duct；
5, loading cylinders；51, hydraulic fluid port is driven；
6, sensitive oil circuit；
7, variable pump；
8, main oil inlet oil duct；
9, total overflow valve.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ", only
For descriptive purposes, it is not understood to indicate or imply relative importance.Wherein, term " first position " and " second position "
For two different positions, moreover, fisrt feature includes fisrt feature above the second feature " above ", " above " and " above "
Right above two features and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature is in the second spy
Sign " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or to be merely representative of first special
It levies level height and is less than second feature.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
The embodiment of the present invention is described below in detail, the example of embodiment is shown in the accompanying drawings, wherein identical from beginning to end
Or similar label indicates same or similar element or element with the same or similar functions.It is retouched below with reference to attached drawing
The embodiment stated is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
Fig. 1 is please referred to, the present embodiment provides a kind of load sensitive system, which includes variable pump 7, sensitivity
Oil circuit 6 and loading cylinders 5.Variable pump 7 is connected to oil sump and load-sensitive valve module, load-sensitive valve module and loading cylinders 5
Connection, and connect with sensitive oil circuit 6, sensitive oil circuit 6 is used to control variable for connecting with the proportional reversing valve of variable pump 7
The swash plate angle of pump 7.It is the prior art by the swash plate angle that sensitive oil circuit 6 controls variable pump 7, as background technology part provides
Two just have in the prior art disclosure, details are not described herein.
Specifically, Fig. 1 to Fig. 6 is please referred to, load-sensitive valve module includes main valve 1, pressure-compensated valve 2 and shuttle valve 3.Main valve
1 is set on oil inlet oil duct 4, and main valve 1 is used to control the open and close of oil inlet oil duct 4, and oil inlet oil duct 4 is connect with variable pump 7；
Pressure-compensated valve 2 includes the first spool 21, the first oil inlet 22 and the first oil outlet 23, and is located at 21 liang of the first spool
The first control oil pocket 241 at end and the second control oil pocket 242, oil inlet oil duct 4 control oil pocket 241 and the first oil inlet with first respectively
Mouth 22 is connected to, and the first oil inlet 22 can be connected to the first oil outlet 23, and the first oil outlet 23 can be with the driving of loading cylinders 5
Hydraulic fluid port 51 is connected to；Shuttle valve 3 is set in the first spool 21, and driving hydraulic fluid port 51 can be connected by shuttle valve 3 and the second control oil pocket 242
It is logical, and oil inlet oil duct 4 can be connected to by shuttle valve 3 with sensitive oil circuit 6.First spool 21 can be in the first control oil pocket 241 and the
It is moved under the action of the pressure difference of two control 242 hydraulic oil of oil pocket, realizes the adjustment to 23 aperture of the first oil outlet.The present embodiment
By the way that shuttle valve 3 to be set in the first spool 21 of pressure-compensated valve 2, compared with prior art, shuttle valve 3 and pressure can be effectively reduced
The length of fluid pressure line between force compensating valve 2, so that the pressure loss during reducing running of hydraulic power oil, improves the feedback of load
Efficiency and feedback accuracy.
Optionally, shuttle valve 3 includes the first accommodating chamber for being set in the first spool 21, the be set in the first accommodating chamber
Two spools 31, and the second oil inlet 33, third oil inlet 34, the second oil outlet 35 that are all set in the first accommodating chamber cavity wall
With third oil outlet 36, oil inlet oil duct 4 can be connected to by throttling passage with the second oil inlet 33, and the second oil outlet 35 can be with
Sensitive oil circuit 6 is connected to, and third oil inlet 34 can be connected to driving hydraulic fluid port 51, third oil outlet 36 and the second control oil pocket 242
Connection, the second oil inlet 33 can be connected to the second oil outlet 35, and third oil inlet 34 can be connected to third oil outlet 36.
Specifically, the first accommodating chamber includes the third control oil pocket 321 and the 4th control oil positioned at 31 both ends of the second spool
Chamber 322, the first spool 21 are equipped with the first oil duct 211 and the second oil duct 212, and the first oil duct 211 is connected to oil inlet oil duct 4 and second
Oil inlet 33, and the hydraulic oil throttling of process, the second oil inlet 33 can be controlled oil pocket 321 with third by the first oil duct 211
Connection, third control oil pocket 321 are connected to the second oil outlet 35, and the second oil duct 212 is connected to third oil inlet 34 and the 4th control
Oil pocket 322, the 4th control oil pocket 322 can be connected to third oil outlet 36.
Second spool 31 has first position, when the second spool 31 is located at first position, third control oil pocket 321 and the
The connection of two oil inlets 33, and the 4th control oil pocket 322 is connected to third oil outlet 36.
Optionally, the second spool 31 also has the second position, if the hydraulic fluid pressure of third control oil pocket 321 is greater than the
The hydraulic fluid pressure of four control oil pockets 322, the second spool 31 move to the second position, if third control oil pocket 321 is hydraulic
Oil pressure is greater than the hydraulic fluid pressure of the 4th control oil pocket 322, and the second spool 31 moves to first position.When the second spool 31
When the second position, the second oil inlet 33 is blocked by the second spool 31, and the second spool 31 controls oil pocket 322 and third for the 4th
Oil outlet 36 separates, and the second oil outlet 35 is connected to third oil outlet 36.
Specifically, the second spool 31 includes valve rod 311 and the piston 312 for being respectively arranged at 311 both ends of valve rod, two pistons
First accommodating chamber is divided into third control oil pocket 321 and the 4th control oil pocket 322 by 312, and is located at third and is controlled oil pocket 321
And the 4th control oil pocket 322 between intermediate oil pocket 323, two pistons 312 with the cavity wall of the first accommodating chamber seal and sliding
Cooperation, valve rod 311 are equipped with the third oil duct 37 of connection third control oil pocket 321 and intermediate oil pocket 323, intermediate oil pocket 323 with
Second oil outlet 35 is connected to and can be connected to third oil outlet 37, and along the extending direction of the first accommodating chamber, third controls oil pocket
321, the second oil inlet 33, the second oil outlet 35, third oil outlet 36 and the 4th control oil pocket 322 are set gradually.
When the second spool 31 is located at first position, a piston 312 is located at the second oil inlet 33 and third control oil pocket
Between 321, another piston 312 is between the second oil outlet 35 and third oil outlet 36；When the second spool 31 is located at second
When position, a piston 312 blocks the second oil inlet 33, another piston 312 is located at third oil outlet 36 and the 4th control
Between oil pocket 322.
Optionally, pressure-compensated valve 2 further includes the second accommodating chamber 24, and the first spool 21 is located in the second accommodating chamber 24, the
The outer peripheral surface of one spool 21 is equipped with annular groove 214, and third oil outlet 36 is connected to annular groove 214, and the is additionally provided on the first spool 21
Four oil ducts 213, the 4th oil duct 213 are connected to annular groove 214 and the second control oil pocket 242.By the way that the 4th is arranged on the first spool 21
Oil duct 213 can avoid that connecting line is arranged in outside, so as to effectively reduce the pressure loss during running of hydraulic power oil.
Optionally, the second accommodating chamber 24 is set on the main valve plug 11 of main valve 1, the first control oil pocket 241 and the second control
Oil pocket 242 is located at the both ends of the second accommodating chamber 24, and the first oil inlet 22 and the first oil outlet 23 are all set in main valve plug 11
On, the first oil inlet 22 and the first oil outlet 23 are connected to the first control oil pocket 241, and main valve plug 11 is additionally provided with can be with sensitivity
The first output oil port 114 and the second output oil port 112 that oil circuit 6 is connected to, the first output oil port 111 are connected to the second oil outlet 35
And can be connected to sensitive oil circuit 6, the second output oil port 112 is connected to third oil inlet 34 and can connect with driving hydraulic fluid port 51
It is logical.It should be noted that the first oil duct 211 is directly connected to the first control oil pocket 241 in the present embodiment.By mending pressure
It repays valve 2 to be set to inside the main valve plug 11 of main valve 1, the oil circuit length between main valve 1 and pressure-compensated valve 2 can be effectively reduced, from
And further decrease the pressure loss during running of hydraulic power oil.In the present embodiment, along the circumferential direction of main valve plug 11, the first oil outlet
23, the first output oil port 111 and the second output oil port 112 are equipped with multiple.
Optionally, pressure-compensated valve 2 further includes the pressure spring 25 being set in the second control oil pocket 242, the both ends of pressure spring 25
It is abutted respectively with the cavity wall of the first spool 21 and the second accommodating chamber 24.By pressure spring 25 and it is located in the second control oil pocket 242
Hydraulic oil control the position of the first spool 21 compared with the hydraulic oil being located in the first control oil pocket 241 carries out pressure, into
And control the aperture of the first oil outlet 23.
Main valve plug 11 has open position and closed position, when main valve plug 11 is located at open position, the first oil inlet 22
It is connected to oil inlet oil duct 4, the first oil outlet 23 and the second output oil port 112 are connected to driving hydraulic fluid port 51, the first output oil port
111 are connected to sensitive oil circuit 6；When main valve plug 11 is located at closed position, the first oil inlet 22 is disconnected with oil inlet oil duct 4, and first
Oil outlet 23 and the second output oil port 112 are disconnected with driving hydraulic fluid port 51, and the first output oil port 111 is disconnected with sensitive oil circuit 6.This
In embodiment, as shown in fig. 6, main valve 1 is set on main valve seat 12, main valve seat 12 is equipped with third accommodating chamber, and main valve plug 11 is sliding
Dynamic to be located in third accommodating chamber, the both ends of third accommodating chamber are respectively equipped with left control chamber (attached to be not shown in the figure) and right control chamber
(attached to be not shown in the figure), main valve plug 11 is between left control chamber and right control chamber.It can be in left control chamber and right control chamber
One in spring is set, be passed through hydraulic oil in another in left control chamber and right control chamber, hydraulic oil pressure and
It drives main valve plug 11 mobile under the collective effect of spring force, realizes the adjustment to 22 aperture of the first oil inlet.
Optionally, load sensitive system includes multiple load-sensitive valve modules and multiple loading cylinders 5 and multiple loads are quick
Sense valve module connects one to one with multiple loading cylinders 5, and multiple oil inlet oil ducts 4 are connected to main oil inlet oil duct 8, main oil inlet oil
Road 8 is connected to the output end of variable pump 7.To which each load-sensitive valve module is in parallel with main oil inlet oil duct 8, can effectively subtract
The pressure loss of the small hydraulic oil between variable pump 7 and each oil inlet oil duct 4.
Please refer to Fig. 1, Fig. 1 show load-sensitive valve module and loading cylinders 5 there are two scheme, wherein be located at
The load-sensitive valve module that the load pressure of the corresponding loading cylinders 5 of the load-sensitive valve module in left side is greater than right side is corresponding negative
Carry the load pressure of oil cylinder 5.Its working principles are as follows:
Left side oil circuit in A: Fig. 1.
Main valve plug 11 opens oil inlet oil duct 4, i.e., main valve plug 11 is located at open position, the first oil inlet 22 and oil inlet oil duct
The hydraulic oil of 4 connections, the output end output of variable pump 7 enters the first control oil pocket 241, the first control through the first oil inlet 22
A part of hydraulic oil in oil pocket 241 passes through the first oil duct 211 and enters intermediate oil pocket 323 through the second oil inlet 33, in
Between a part of hydraulic oil in oil pocket 323 enter third control oil pocket 321 through third oil duct 37, in intermediate oil pocket 323
Another part of hydraulic oil enters sensitive oil circuit 6 through the first output oil port 111 on the second oil outlet 35 and main valve plug 11, from
And shuttle valve 3 is by the load pressure feedback of the biggish left load oil cylinder 5 of load pressure to sensitive oil circuit 6.First control oil pocket 241
Another part of interior hydraulic oil is flowed out from the first oil outlet 23, and a part for flowing out the hydraulic oil of the first oil outlet 23 enters
The driving hydraulic fluid port 51 of loading cylinders 5 flows out another part of the hydraulic oil of the first oil outlet 23 for driving loading cylinders 5 to act
It is flowed into third oil inlet 34 from the second output oil port 112, and enters the 4th control oil pocket 322 through the second oil duct 212, and
Hydraulic fluid pressure is greater than the hydraulic fluid pressure of third control oil pocket 321 in 4th control oil pocket 322, and the second spool 31 is located at this time
First position, the 4th hydraulic oil controlled in oil pocket 322 enter annular groove 214 through third oil outlet 36, and through the 4th oil duct 213
The second control oil pocket 242 is entered, the hydraulic oil and pressure spring 25 and first of the second control oil pocket 242 control in oil pocket 241
Hydraulic oil carries out pressure relatively and by driving the first spool 21 movement, controls the aperture of the first oil outlet 23.
Right side oil circuit in B: Fig. 1.
Main valve plug 11 opens oil inlet oil duct 4, and main valve plug 11 is located at open position, the liquid of the output end output of variable pump 7
Pressure oil enters the first control oil pocket 241 through the first oil inlet 22 on main valve plug 11, the hydraulic oil in the first control oil pocket 241
A part flowed out from the first oil outlet 23, a part of hydraulic oil for flowing out the first oil outlet 23 enters loading cylinders 5
For driving loading cylinders 5 to act, the another part for flowing out the hydraulic oil of the first oil outlet 23 exports driving hydraulic fluid port 51 from second
Hydraulic fluid port 112 is flowed into third oil inlet 34, and enters the 4th control oil pocket 322 through the second oil duct 212, in sensitive oil circuit 6
Hydraulic oil passes sequentially through the first output oil port 111 and the second oil outlet 35 is flowed into intermediate oil pocket 323, the liquid of intermediate oil pocket 323
A part in pressure oil enters third control oil pocket 321, hydraulic oil pressure in the oil pocket 321 of third control at this time through third oil duct 37
Power is greater than the hydraulic fluid pressure of the 4th control oil pocket 322, and the second spool 31 is located at the second position, so that the second oil inlet 33 is sealed
Stifled, the hydraulic oil at the second oil inlet 33 is barred from outside the second spool 31, third oil outlet 36 and the 4th control oil pocket 322 it
Between access blocked by piston 312, intermediate oil pocket 323 is connected to third oil outlet 36, another in the hydraulic oil of intermediate oil pocket 323
A part enters annular groove 214 through third oil outlet 36, and enters the second control oil pocket 242, the second control through the 4th oil duct 213
The hydraulic oil of liquefaction chamber 242 is compared with the hydraulic oil in the first control oil pocket 241 carries out pressure and through the first spool 21 of driving
Movement controls the aperture of the first oil outlet 23.
As needed, the load-sensitive valve module in load sensitive system and loading cylinders 5 may be arranged as 3 or 3
More than a, at this point, the oil circuit of load-sensitive valve module corresponding to load pressure maximum one in all loading cylinders 5 is such as
Above-mentioned left side oil circuit, for example above-mentioned right side oil circuit of oil circuit of load-sensitive valve module corresponding to remaining loading cylinders 5.
Load sensitive system further includes the total overflow valve 9 connecting with sensitive oil circuit 6.
Obviously, the above embodiment of the present invention is just for the sake of clearly illustrating examples made by the present invention, and being not is pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (13)
1. a kind of load-sensitive valve module characterized by comprising
Main valve (1) is set on oil inlet oil duct (4), and the main valve (1) is used to control unlatching and the pass of the oil inlet oil duct (4)
It closes；
Pressure-compensated valve (2), including the first spool (21), the first oil inlet (22) and the first oil outlet (23), and position respectively
Oil pocket (241) and the second control oil pocket (242), the oil inlet oil duct (4) are controlled in the first of the first spool (21) both ends
It can be connected to respectively with first control oil pocket (241) and first oil inlet (22), the first oil inlet (22) energy
Enough to be connected to first oil outlet (23), first oil outlet (23) can be with the driving hydraulic fluid port (51) of loading cylinders (5)
Connection；
Shuttle valve (3) is set in first spool (21), and the driving hydraulic fluid port (51) can pass through the shuttle valve (3) and institute
The connection of the second control oil pocket (242) is stated, and the oil inlet oil duct (4) can be connected by the shuttle valve (3) and sensitive oil circuit (6)
It is logical.
2. load-sensitive valve module according to claim 1, which is characterized in that the shuttle valve (3) is described including being set to
The first accommodating chamber in first spool (21), the second spool (31) being set in first accommodating chamber, and be all set in
The second oil inlet (33), third oil inlet (34), the second oil outlet (35) and third in the first accommodating chamber cavity wall is fuel-displaced
Mouth (36), the oil inlet oil duct (4) can be connected to by throttling passage with second oil inlet (33), second oil outlet
(35) it can be connected to the sensitive oil circuit (6), the third oil inlet (34) can be connected to the driving hydraulic fluid port (51), institute
It states third oil outlet (36) to be connected to second control oil pocket (242), second oil inlet (33) can be with described second
Oil outlet (35) connection, and the third oil inlet (34) can be connected to the third oil outlet (36).
3. load-sensitive valve module according to claim 2, which is characterized in that first accommodating chamber includes positioned at described
Third control oil pocket (321) at the second spool (31) both ends and the 4th control oil pocket (322), first spool (21) are equipped with
First oil duct (211) and the second oil duct (212), first oil duct (211) be connected to the oil inlet oil duct (4) and described second into
Hydraulic fluid port (33), and first oil duct (211) can by the hydraulic oil throttling of process, second oil inlet (33) can with it is described
Third controls oil pocket (321) connection, and third control oil pocket (321) is connected to second oil outlet (35), and described second
Oil duct (212) is connected to the third oil inlet (34) and the 4th control oil pocket (322), the 4th control oil pocket (322)
It can be connected to the third oil outlet (36).
4. load-sensitive valve module according to claim 3, which is characterized in that second spool (31) has first
It sets, when second spool (31) is located at the first position, third control oil pocket (321) and second oil inlet
(33) it is connected to, and the 4th control oil pocket (322) is connected to the third oil outlet (36).
5. load-sensitive valve module according to claim 4, which is characterized in that second spool (31) also has second
Position, when second spool (31) is located at the second position, second oil inlet (33) is by second spool
(31) it blocks, and second spool (31) separates the 4th control oil pocket (322) and the third oil outlet (36), institute
The second oil outlet (35) is stated to be connected to the third oil outlet (36).
6. load-sensitive valve module according to claim 5, which is characterized in that second spool (31) includes valve rod
(311) and it is respectively arranged at the piston (312) at the valve rod (311) both ends, two pistons (312) accommodate described first
Chamber is divided into third control oil pocket (321) and the 4th control oil pocket (322), and is located at the third and controls oil pocket
(321) the intermediate oil pocket (323) between the 4th control oil pocket (322), two pistons (312) accommodate with described first
The cavity wall of chamber is sealed and is slidably matched, and the valve rod (311), which is equipped with, is connected to third control oil pocket (321) and the centre
The third oil duct (37) of oil pocket (323), the intermediate oil pocket (323) be connected to second oil outlet (35) and can with it is described
Third oil outlet (37) connection, along the extending direction of first accommodating chamber, the third controls oil pocket (321), described second
Oil inlet (33), second oil outlet (35), the third oil outlet (36) and the 4th control oil pocket (322) are successively set
It sets；
When second spool (31) is located at the first position, a piston (312) is located at second oil inlet
(33) between third control oil pocket (321), another described piston (312) is located at second oil outlet (35) and institute
It states between third oil outlet (36)；When second spool (31) is located at the second position, a piston (312) will
Second oil inlet (33) blocks, another described piston (312) is located at the third oil outlet (36) and the 4th control
Between liquefaction chamber (322).
7. load-sensitive valve module according to claim 2, which is characterized in that the pressure-compensated valve (2) further includes
Two accommodating chambers (24), first spool (21) are located in second accommodating chamber (24), the periphery of first spool (21)
Face is equipped with annular groove (214), and the third oil outlet (36) is connected to the annular groove (214), on first spool (21) also
Equipped with the 4th oil duct (213), the 4th oil duct (213) is connected to the annular groove (214) and second control oil pocket (242).
8. load-sensitive valve module according to claim 7, which is characterized in that second accommodating chamber (24) is set to institute
It states on the main valve plug (11) of main valve (1), first control oil pocket (241) and second control oil pocket (242) are located at
The both ends of second accommodating chamber (24), first oil inlet (22) and first oil outlet (23) are all set in the master
On spool (11), first oil inlet (22) and first oil outlet (23) connect with first control oil pocket (241)
Logical, the main valve plug (11) is additionally provided with the first output oil port (114) that can be connected to the sensitive oil circuit (6) and the second output
Hydraulic fluid port (112), first output oil port (111) be connected to second oil outlet (35) and can with being capable of the sensitive oil
Road (6) connection, second output oil port (112) are connected to the third oil inlet (34) and can be with the driving hydraulic fluid ports
(51) it is connected to.
9. load-sensitive valve module according to claim 8, which is characterized in that the main valve plug (11) has open position
And closed position, when the main valve plug (11) is located at the open position, first oil inlet (22) and oil inlet oil
Road (4) connection, first oil outlet (23) and second output oil port (112) are connected to the driving hydraulic fluid port (51),
First output oil port (111) is connected to the sensitive oil circuit (6)；When the main valve plug (11) are located at the closed position
When, first oil inlet (22) and the oil inlet oil duct (4) disconnect, first oil outlet (23) and the second output oil
Mouth (112) is disconnected with the driving hydraulic fluid port (51), and first output oil port (111) and the sensitive oil circuit (6) disconnect.
10. load-sensitive valve module according to claim 9, which is characterized in that the pressure-compensated valve (2) further includes setting
Be placed in it is described second control oil pocket (242) in pressure spring (25), the both ends of the pressure spring (25) respectively with first spool
(21) it is abutted with the cavity wall of second accommodating chamber (24).
11. a kind of load sensitive system, which is characterized in that including the described in any item load-sensitive valve groups of claim 1-10
Part, the load sensitive system further include:
Variable pump (7), the variable pump (7) can be connected to oil sump and oil inlet oil duct (4)；
Sensitive oil circuit (6), connect with the proportional reversing valve of the variable pump (7), and the swash plate for controlling the variable pump (7)
Angle；
The driving hydraulic fluid port (51) of loading cylinders (5), the loading cylinders (5) can be connected to the first oil outlet (23).
12. load sensitive system according to claim 11, which is characterized in that the load-sensitive valve module and described negative
It is multiple for carrying the quantity of oil cylinder (5), and multiple load-sensitive valve modules and multiple loading cylinders (5) correspond
Connection, multiple oil inlet oil ducts (4) are connected to main oil inlet oil duct (8), the main oil inlet oil duct (8) and the variable pump
(7) output end connection.
13. load sensitive system according to claim 11, which is characterized in that the load sensitive system further includes and institute
State total overflow valve (9) of sensitive oil circuit (6) connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910672500.2A CN110374945B (en) | 2019-07-24 | 2019-07-24 | Load sensitive valve assembly and load sensitive system |
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|---|---|---|---|
| CN201910672500.2A CN110374945B (en) | 2019-07-24 | 2019-07-24 | Load sensitive valve assembly and load sensitive system |
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| CN110374945B CN110374945B (en) | 2020-07-28 |
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| US20140245732A1 (en) * | 2013-03-01 | 2014-09-04 | Fsp Fluid Systems Partners Holding Ag | Proportional directional control valve, and hydraulic circuit and hydropneumatic suspension system having such a valve |
| CN108443273A (en) * | 2018-03-14 | 2018-08-24 | 燕山大学 | A kind of emergency management and rescue vehicle equipment oil return line pressure compensation throttle control system |
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| GB2317651A (en) * | 1996-09-28 | 1998-04-01 | Danfoss As | Hydraulic systems |
| CN102384113A (en) * | 2011-08-09 | 2012-03-21 | 三一重机有限公司 | Oil supply and energy-saving device for mining dump truck |
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|---|---|
| CN110374945B (en) | 2020-07-28 |
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