CN106762916A - Work connection, load sensing multi-way valve and engineering machinery - Google Patents
Work connection, load sensing multi-way valve and engineering machinery Download PDFInfo
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- CN106762916A CN106762916A CN201710109763.3A CN201710109763A CN106762916A CN 106762916 A CN106762916 A CN 106762916A CN 201710109763 A CN201710109763 A CN 201710109763A CN 106762916 A CN106762916 A CN 106762916A
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- oil
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- pressure
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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
Abstract
The present invention relates to one kind work connection, load sensing multi-way valve and engineering machinery, work connection includes：Valve body, is inside provided with the main valve plug that can be moved in valve body；Pilot control selection element, is arranged between the control chamber of the main valve plug and various pilot controls, the pilot control of the control chamber that can select to be supplied to the main valve plug in various pilot controls.The present invention realizes selection of the control chamber of main valve plug in different pilot control modes by setting pilot control selection element between the control chamber of main valve plug and various pilot controls, so as to increase control redundancy, improves control reliability.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, more particularly to a kind of work connection, load-sensitive (Load Sensing, abbreviation
LS) banked direction control valves and engineering machinery.
Background technology
Banked direction control valves be based on two or more reversal valve, collection various control valve (for example reversal valve, check valve, overload valve,
Fill valve and brake valve etc.) in the multifunction integrated valve of one, belong to the core part of construction machinery hydraulic system.Banked direction control valves leads to
It is frequently located between pump and executive component, uninterrupted and flow direction for controlling hydraulic oil, so that centralized Control engineering machinery is held
The direction of motion and speed of units.
The banked direction control valves of current engineering machinery mainly has traditional banked direction control valves, minus flow banked direction control valves, positive flow banked direction control valves, load
Four kinds of sensing multi-way valve.Traditional banked direction control valves, minus flow banked direction control valves, positive flow banked direction control valves flow are influenceed by load pressure change, and
During composite move flux and flow direction load smaller executive component and cause flow cannot it is anticipated that state is allocated, therefore, it is right
Load sensing multi-way valve being used control accuracy requirement construction machinery hydraulic system higher more.
General load sensing multi-way valve mainly includes：Valve body, main valve plug, compensating spool, controlling organization etc..According to main frame
Product operating mode needs, and overflow valve, Fill valve, LS overflow valves, load holding valve etc. also can be set.LS pressure also can be set on valve body
Selection oil duct, selection corresponds to different operating hydraulic fluid port (such as A, B mouthful etc.) high pressure in the course of the work, used as pumpage control
Signal.
The control mode of existing banked direction control valves experienced the stages such as manually operated, hydraulic controlled operation and electro-hydraulic proportional control technology,
And mesh first three control mode is all relatively common in actual applications.But banked direction control valves pilot control scheme is only capable of realizing a kind of control
Mode processed, that is, be only capable of realizing single precursor control by hand, Hydraulic guide control, electric proportion pilot control, and can not be simultaneously real
Existing two or more control mode.After single control mode fails, main computer boxes then cisco unity malfunction, or even meeting
Appearance accident.
The content of the invention
The purpose of the present invention is to propose to one kind work connection, load sensing multi-way valve and engineering machinery, it is capable of the reality of selectivity
Existing different pilot control modes.
To achieve the above object, the invention provides one kind work connection, including：
Valve body, is inside provided with the main valve plug that can be moved in valve body；
Pilot control selection element, is arranged between the control chamber of the main valve plug and various pilot controls, can be many
Selection is supplied to the pilot control of the control chamber of the main valve plug in kind pilot control.
Further, various pilot controls include electric-hydraulic proportion pilot control and hydraulic control pilot control, the guide
Oil sources selection element be arranged on the control chamber of the main valve plug respectively with the electric-hydraulic proportion pilot control and the hydraulic control guide
On oil circuit between oil sources.
Further, it is provided with the oil circuit between the electric-hydraulic proportion pilot control and the pilot control selection element
Electric proportional pressure-reducing valve.
Further, the pilot control selection element includes that pressure selects component, the pressure to select the input of component
Mouth is connected with various pilot controls respectively, and the delivery outlet of the pressure selection component and the control chamber of the main valve plug connect
It is logical, the hydraulic control signal that guide's oil pressure maximum is input into various pilot controls can be input to the control of the main valve plug
Chamber processed, to drive the main valve plug to be moved in the valve body.
Further, various pilot controls include electric-hydraulic proportion pilot control and hydraulic control pilot control, the guide
Oil sources selection element be arranged on the control chamber of the main valve plug respectively with the electric-hydraulic proportion pilot control and the hydraulic control guide
On oil circuit between oil sources, the electric-hydraulic proportion pilot control includes that automatically controlled guide supplies oil circuit and automatically controlled guide's oil return circuit,
Work connection also includes electric proportional pressure-reducing valve, the normally closed input port and normally opened input port of the electric proportional pressure-reducing valve respectively with institute
State automatically controlled guide's supply oil circuit to be connected with automatically controlled guide's oil return circuit, the delivery outlet and the liquid of the electric proportional pressure-reducing valve
Two input ports of the control pilot control respectively with pressure selection component connect.
Further, the pressure selection component is shuttle valve or shuttle valve network.
Further, it is additionally provided with filter in the oil circuit before the normally closed input port of the electric proportional pressure-reducing valve.
Further, also including the guide's end cap being arranged on the valve body, the electric proportional pressure-reducing valve and the filtering
Device is installed on guide's end cap.
Further, also including manually operated end cap, it is arranged on the valve body, and is connected with the main valve plug, can
Main valve plug described in manual actuation is moved in the valve body.
Further, pressure compensation valve element is also included in the valve body, and before the oil inlet of the main valve plug,
The pressure compensation valve element is provided with the shoulder structure that can realize that load keeps, and the shoulder structure has positioned at the valve body
Work fluid input port side conical surface and the radial direction bearing surface positioned at the oil inlet side of the main valve plug.
Further, the jack connected with each actuator port of the main valve plug is additionally provided with the valve body, at this
Overload valve, Fill valve, overload oil compensating valve or overload oil compensating valve is optionally set on jack to block up.
Further, the overload oil compensating valve blocking package includes sealing ring, plug and the plug screw formula mounting seat with hollow oil duct,
The plug screw formula mounting seat is arranged in the jack, and is sealed with the jack hole wall by the sealing ring, described
Plug is removably mounted in the hollow oil duct, in the state of plug described in removal, can in the hollow oil duct
Pressure measuring tie-in is installed.
Further, main load-sensitive oil circuit, a plurality of load-sensitive oil circuit are additionally provided with the valve body and are arranged on
Connection oil circuit between the main load-sensitive oil circuit and at least part of load-sensitive oil circuit, the main load-sensitive oil circuit and institute
State the load-sensitive chamber connection of main valve plug, and outwards output loading sensitivity fuel injection pressure signal, a plurality of load-sensitive oil circuit difference
Connected with each load-sensitive hydraulic fluid port of the main valve plug, moved in the main valve plug corresponding from different workload oil circuits
Position when, in a plurality of load-sensitive oil circuit corresponding to current work load oil circuit load-sensitive oil circuit with it is main load it is quick
Sense oil circuit pressure is identical, and oil pressure relief is provided with the main load-sensitive oil circuit, a plurality of load-sensitive oil circuit and connection oil circuit
Selection device, can realize the setting of the identical or different oil pressure relief of each load-sensitive oil circuit.
Further, the oil pressure relief selection device includes that overflow valve and oil are stifled, distinguishes when to each load-sensitive oil circuit
When setting different oil pressure reliefs, set oily stifled in the connection oil circuit, and be respectively provided with every load-sensitive oil circuit predetermined
Oil pressure relief overflow valve, when to each load-sensitive oil circuit set identical oil pressure relief when, in a load-sensitive oil circuit
The overflow valve of predetermined oil pressure relief is set, and oil is set in other load-sensitive oil circuits and block up, and keep the connection oil circuit
It is unimpeded.
Further, pressure compensation valve element is also included in the valve body, and before the oil inlet of the main valve plug,
The spring cavity of the pressure compensation valve element and the main load-sensitive oil communication.
Further, the pad of varying number can also be increased in the spring cavity bottom of the pressure compensation valve element, to change
Become the pre compressed magnitude of spring used by the pressure compensation valve element.
Further, the filter is plug screw formula filter, and what can be opened up on guide's end cap is interior
Kong Zhong.
To achieve the above object, work connection the invention provides a kind of load sensing multi-way valve including foregoing.
To achieve the above object, the invention provides a kind of engineering machinery, including foregoing load sensing multi-way valve.
Based on above-mentioned technical proposal, the present invention sets guide by between the control chamber of main valve plug and various pilot controls
Oil sources selection element realizes selection of the control chamber of main valve plug in different pilot control modes, so as to increase control redundancy
Property, improve control reliability.
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 does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the hydraulic principle schematic diagram of an embodiment of present invention work connection.
Fig. 2 is the cross-sectional view of present invention work connection embodiment.
Fig. 3 is the cross-sectional view of pressure-compensated valve in present invention work connection embodiment.
Fig. 4 is the cross-sectional view of overload oil compensating valve plug in present invention work connection embodiment.
Fig. 5 is the structural representation of the LOOK RIGHT degree of present invention work connection embodiment.
Fig. 6-8 is respectively the cross-sectional view in E-E sections, D-D sections and F-F sections in Fig. 5.
Fig. 9 is the cross-sectional view in G-G sections in Fig. 2.
Figure 10 is the structural representation of guide's end cap in present invention work connection embodiment.
Figure 11 is the hydraulic principle schematic diagram of another embodiment of present invention work connection.
Specific embodiment
Below by drawings and Examples, technical scheme is described in further detail.
As shown in figure 1, the hydraulic principle schematic diagram of the embodiment for present invention work connection.Structure with reference to shown in Fig. 2
Schematic diagram, the work connection in the present embodiment includes valve body 9 and pilot control selection element, and interior being provided with of valve body 9 can be in valve body 9
The main valve plug 1.1 of motion, pilot control selection element is arranged between the control chamber of main valve plug 1.1 and various pilot controls, energy
Enough selections in various pilot controls are supplied to the pilot control of the control chamber of the main valve plug 1.1.
Various pilot controls can include that the hydraulic oil of various different guide's forms is originated, such as what is shown in Fig. 1 is electro-hydraulic
Proportion pilot oil sources and hydraulic control pilot control a1, b1, and pilot control selection element is arranged on the control chamber of the main valve plug 1.1
Respectively with the oil circuit between the electric-hydraulic proportion pilot control and described hydraulic control pilot control a1, b1 on, the choosing of such pilot control
Selecting element can select the pressure oil from electric-hydraulic proportion pilot control, or selection to come from hydraulic control guide oil to main valve plug 1.1
The pressure oil of source a1, b1, it is achieved thereby that the control program of electrichydraulic control and the integrated control of hydraulic control, when single control mode is lost
During effect, can ensure that the work joins by switching another pilot control still can work on, so that it is guaranteed that operation sets
It is standby to run well, it is to avoid the generation of accident.
Pilot control selection element includes that pressure selects component, and shuttle valve 3.1 and shuttle valve 3.2 are employed in Fig. 1 embodiments
Component is selected as pressure.If shuttle valve net can also be used when being related to the pilot control of more than three in another embodiment
Network selects component as pressure.In annexation, the input port of pressure selection component connects with various pilot controls respectively, and
The delivery outlet of pressure selection component is connected with the control chamber of main valve plug 1.1.The oil pressure provided by relatively more different pilot controls, will
The maximum hydraulic control signal of guide oil pressure is input into various pilot controls to be input to the control chamber of the main valve plug 1.1 to drive
The motion in the valve body 9 of the dynamic main valve plug 1.1.
In Fig. 1, electric-hydraulic proportion pilot control may particularly include automatically controlled guide's supply oil circuit X and automatically controlled guide's oil return circuit
Y.Automatically controlled guide's supply oil circuit X can use outer oil passage, it would however also be possible to employ internal oil passages are by way of pressure-reducing valve fuel feeding.For
The selection of pilot control is relatively carried out by pressure ratio, electric proportional pressure-reducing valve 4.1 and electric ratio can be added to subtract in the connection that works
Pressure valve 4.2, corresponds to the control chamber of the both sides of main valve plug 1.1 respectively.The normally closed input port of electric proportional pressure-reducing valve 4.1,4.2 and normally opened defeated
Entrance respectively with automatically controlled guide supply oil circuit X and automatically controlled guide's oil return circuit Y connect, the delivery outlet of electric proportional pressure-reducing valve 4.1 with
Two input ports of the hydraulic control pilot control a1 respectively with pressure selection component (shuttle valve 3.1) connect, and electric proportional pressure-reducing valve 4.2
Two input ports of delivery outlet and hydraulic control pilot control b1 respectively with pressure selection component (shuttle valve 3.2) connect.Compare by electricity
Example pressure-reducing valve 4.1 or electric proportional pressure-reducing valve 4.2 are powered and current/voltage control, can efficiently control the motion of main valve plug 1.1
State and movement position, to adapt to the demand of different operating modes.
It is higher in view of banked direction control valves pilot mechanism precision and oil cleanliness requirement, and engineering machinery working environment evil
Bad, fluid is easily contaminated, and can also be set in the oil circuit before the normally closed input port of electric proportional pressure-reducing valve 4.1,4.2
Filter device 8, to ensure the specified cleannes of guide's fluid, eliminates the susceptible to plugging problem of pilot mechanism, lifting banked direction control valves control
Reliability.
With reference to Figure 10, the filter 8 is preferably plug screw formula filter 8.1.Guide's end cap can also be installed on valve body 9
15, and plug screw formula filter 8.1 can be arranged in the endoporus opened up on guide's end cap 15, its simple structure function reliability, also easily
In dismounting and cleaning.Foregoing electric proportional pressure-reducing valve 4.1 and 4.2 can also be installed on guide's end cap 15.
With reference to Fig. 1, when work connection is using electrichydraulic control pattern, if necessary to the connected executive component of work connection from work
Connection hydraulic fluid port A1 oil-feeds, work connection hydraulic fluid port B1 oil returns, then can obtain electric proportional pressure-reducing valve 4.1 electric, and electric proportional pressure-reducing valve 4.2 keeps losing
Electricity condition, the guide's fluid now from automatically controlled guide supply oil circuit X arrives shuttle valve 3.1 by electric proportional pressure-reducing valve 4.1, and now
The corresponding oil circuits of hydraulic control pilot control a1 do not lead to guide's fluid, therefore the guide from automatically controlled guide supply oil circuit X for selecting
Fluid reaches the control chamber on main valve plug 1.1 near actuator port B one end by shuttle valve 3.1, promotes main valve plug 1.1 to opposite side
It is mobile, make P mouthfuls from work connection (being in fig. 2 from valve body 9) of work fluid via pressure-compensated valve 2, oil inlet
Work connection hydraulic fluid port A1 is reached after P ', actuator port A, by returning to work connection hydraulic fluid port B1 after executive component, then via actuator port B
Return to T mouthfuls of work connection.
If necessary to the connected executive component of work connection from work connection hydraulic fluid port B1 oil-feeds, work connection hydraulic fluid port A1 oil returns then may be used
Obtain electric proportional pressure-reducing valve 4.2 electric, electric proportional pressure-reducing valve 4.1 keeps power failure state, now from automatically controlled guide supply oil circuit X's
Guide's fluid arrives shuttle valve 3.2 by electric proportional pressure-reducing valve 4.2, and now the corresponding oil circuits of hydraulic control pilot control b1 do not lead to guide oil
Liquid, therefore the guide's fluid from automatically controlled guide supply oil circuit X selected reaches close on main valve plug 1.1 by shuttle valve 3.2
The control chamber of actuator port A one end, promotes main valve plug 1.1 to another side shifting, passes through P mouthfuls from work connection of work fluid
By pressure-compensated valve 2, oil inlet P ', work connection hydraulic fluid port B1 is reached after actuator port B, by returning to work connection oil after executive component
Mouth A1, then return to T mouthfuls that work joins via actuator port A.
When the failure of electric proportional pressure-reducing valve or some operating modes need to carry out the control of main valve plug 1.1 using hydraulic control mode
When, if necessary to the connected executive component of work connection from work connection hydraulic fluid port A1 oil-feeds, work connection hydraulic fluid port B1 oil returns, then from hydraulic control
Guide's fluid of pilot control a1 directly reaches shuttle valve 3.1, and now the other end inlet communication of shuttle valve 3.1 is automatically controlled guide
Oil return circuit Y, therefore the guide's fluid from hydraulic control pilot control a1 selected is by the arrival main valve plug 1.1 of shuttle valve 3.1
Near the control chamber of actuator port B one end, promote main valve plug 1.1 to another side shifting, make P mouthfuls from work connection of working oil
Liquid is via pressure-compensated valve 2, oil inlet P ', work connection hydraulic fluid port A1 is reached after actuator port A, by returning to work after executive component
Connection hydraulic fluid port B1, then return to T mouthfuls that work joins via actuator port B.
If necessary to the connected executive component of work connection from work connection hydraulic fluid port B1 oil-feeds, work connection hydraulic fluid port A1 oil returns then come
Shuttle valve 3.2 is directly reached from guide's fluid of hydraulic control pilot control b1, and now the other end inlet communication of shuttle valve 3.2 is electricity
Control guide oil return circuit Y, therefore the guide's fluid from hydraulic control pilot control b1 selected reaches main valve plug by shuttle valve 3.2
Near the control chamber of actuator port A one end on 1.1, promote main valve plug 1.1 to another side shifting, make P mouthfuls from work connection
Work fluid is via pressure-compensated valve 2, oil inlet P ', work connection hydraulic fluid port B1 is reached after actuator port B, by being returned after executive component
Work connection hydraulic fluid port A1 is returned, then T mouthfuls that work joins is returned via actuator port A.
In another embodiment, manually operated end cap can also be included, is in other words made guide's end cap into manually operated
End cap, the end cap is arranged on valve body 9, and is connected with the main valve plug 1.1, can main valve plug 1.1 described in manual actuation in institute
State motion in valve body 9.The setting of end cap is manually operated, the work connection or even load sensing multi-way valve can be made to realize electricity
Liquid proportional control, three kinds of control models of hydraulic control and manual control.
In fig. 2, main load-sensitive oil circuit f1 (abbreviation f1 oil ducts) phase in load-sensitive chamber LS (abbreviation LS chambers) and Fig. 1
Connection, load-sensitive hydraulic fluid port LSA (abbreviation LSA chambers) is connected with the load-sensitive oil circuit f3 (abbreviation f3 oil ducts) in Fig. 1, loads
Sensitive hydraulic fluid port LSB (abbreviation LSB chambers) is connected with the load-sensitive oil circuit f2 (abbreviation f2 oil ducts) in Fig. 1.Work is associated in A work
When making, valve element is moved to right, and LS chambers are connected with LSA chambers, and now f1, f3 oil duct pressure are identical, is A mouthfuls of pressure；When working for B,
Valve element is moved to left, and LS chambers are connected with LSB chambers, and now f1, f2 oil duct pressure are identical, is B mouthfuls of pressure.If desired outwards output f3 is pressed
Power, then can be removed and loaded onto pressure measurement and connect using the f6 oil ducts (corresponding to the MA oil ducts in Fig. 1) in Fig. 8 by the plug in f6 oil ducts
Head；Outwards output f2 pressure is needed, is the f5 oil ducts (corresponding to the MB oil ducts in Fig. 1) in Fig. 6, will be stifled in f5 oil ducts
Head removes loads onto pressure measuring tie-in.
The jack for being connected with each working oil chamber A, B of main valve plug 1.1 respectively can be set on valve body 9, in the jack
On optionally set overload valve, Fill valve, overload oil compensating valve (referring to overload oil compensating valve in Fig. 1 6.1,6.2) or overload mend
Fuel tap plug (referring to overload oil compensating valve in Figure 11 stifled 17.1,17.2).Fig. 4 shows a kind of overload that can realize pressure measuring function
Fill valve plug, the overload oil compensating valve plug includes sealing ring 13.1, sealing ring 13.2, plug 10.2 and with hollow oil duct
Plug screw formula mounting seat 11, plug screw formula mounting seat 11 is arranged in the jack, and by the sealing ring 13.1 and sealing ring
13.2 are sealed with jack hole wall, and plug 10.2 is removably mounted in the hollow oil duct.When need measure the work
During the oil pressure of hydraulic fluid port, by the removal of plug 10.2, and pressure measuring tie-in can be installed in the hollow oil duct realize pressure measuring function.Phase
On oil duct install three-way connection additional and detect the mode of hydraulic fluid port pressure than being connect outside the need for existing, the present embodiment is not only reduced
Cost and the pressure loss point of system, and limited without by installing space.
After plug screw formula mounting seat 11 is removed, overload valve, Fill valve or overload repairing can also be as needed installed
Valve.When main frame operating mode only needs overload function to be produced without emptying phenomenon, overload valve can be only installed i.e. in overload oil compensating valve jack
Can.When main frame operating mode only needs repairing function and no pressure is limited, Fill valve can be only installed in overload oil compensating valve jack.
When main frame operating mode has overload protection to be needed to be needed with repairing function simultaneously, overload can be only installed in overload oil compensating valve jack and mend
Fuel tap.Being protected when main frame operating mode both No-mistake Principle needs, and when also being needed without repairing function, can be installed in overload oil compensating valve jack
Overload oil compensating valve is blocked up.Therefore, not only applicability is good for the structure of realizing of the present embodiment, and simple structure, tests also very square
Just.
In Fig. 1, valve body 9 is provided with main load-sensitive oil circuit f1, a plurality of load-sensitive oil circuit f2, f3 and is arranged on master
Connection oil circuit f4 between load-sensitive oil circuit f1 and at least part of load-sensitive oil circuit f2, f3.Main load-sensitive oil circuit f1 with
The load-sensitive chamber LS connections of main valve plug 1.1, and outwards output LS fuel injection pressure signals, the LS fuel injection pressure signals can be arrived by check valve
The discharge capacity of control and the pump of load sensing multi-way valve cooperation is gone up to total LS oil circuits.Each bar load-sensitive oil circuit f2, f3 respectively with
Each load-sensitive hydraulic fluid port LSB, LSA connection of main valve plug 1.1.Moved to and different workload oil circuits in main valve plug 1.1
During corresponding position, load-sensitive oil circuit f2 or f3 corresponding to current work load oil circuit are then pressed with main load-sensitive oil circuit f1
Power is identical.
Work is set to join hydraulic fluid port A1 oil-feeds if main valve plug 1.1 is switched to, during the working position of work connection hydraulic fluid port B1 oil returns, load
Sensitive oil circuit f3 connects the LSA chambers during working position, while LSA chambers connect with load-sensitive chamber LS, now load-sensitive oil circuit
F3 is identical with main load-sensitive oil circuit f1 pressure.Work is set to join hydraulic fluid port B1 oil-feeds, work connection hydraulic fluid port if main valve plug 1.1 is switched to
During the working position of A1 oil returns, load-sensitive oil circuit f2 connects the LSB chambers during working position, while LSB chambers and load-sensitive chamber LS
Connection, now load-sensitive oil circuit f2 is identical with main load-sensitive oil circuit f1 pressure.In main load-sensitive oil circuit f1, a plurality of load
Sensitive oil circuit f2, f3 and connection oil circuit f4 are provided with oil pressure relief selection device, can realize each load-sensitive oil circuit f2, f3's
The setting of identical or different oil pressure relief.
Specifically, to may particularly include overflow valve and oil stifled (such as auxetic stifled etc.) for oil pressure relief selection device, when to each
When load-sensitive oil circuit sets different oil pressure reliefs respectively, set oily stifled in the connection oil circuit, and in every load-sensitive
The overflow valve of predetermined oil pressure relief is respectively provided with oil circuit.For example, load-sensitive oil circuit f2 and load-sensitive oil circuit in Fig. 1
It is respectively equipped with overflow valve 5.1 and overflow valve 5.2 in f3, and the connection between main load-sensitive oil circuit f1 and load-sensitive oil circuit f2
Oil stifled 14.1 is provided with oil circuit f4, now the respective oil pressure reliefs of load-sensitive oil circuit f2 and f3 can be by overflow valve 5.1
Be arranged to different with overflow valve 5.2, to meet different overflow requirements the need for.
When needing to set identical oil pressure relief to each load-sensitive oil circuit, except can be using foregoing by different loads
The oil pressure relief of the overflow valve of sensitive oil circuit is arranged to outside identical mode, can also be set in a load-sensitive oil circuit
The overflow valve of predetermined oil pressure relief, and set oily stifled in other load-sensitive oil circuits, and keep the load-sensitive oil
Connection oil circuit between Lu Yuzhu load-sensitive oil circuits is unimpeded.For example, load-sensitive oil circuit f2 is provided with overflow in Figure 11
Connection oil circuit f4 between valve, and main load-sensitive oil circuit f1 and load-sensitive oil circuit f2 is unimpeded, and another load-sensitive
Oil circuit f3 is then provided with oil stifled 14.2.This makes it possible to make load-sensitive oil circuit f2 and f3 share same overflow valve 5.1, and in fact
Now unified oil pressure relief.This mode can save valve body cost, the plug number reduced on valve body, improve valve body reliability
Property.
In fig. 2, the pressure compensation valve element 2.1 set in valve body 9 is corresponding to the pressure-compensated valve 2 in Fig. 1.With reference to
Fig. 1 and Fig. 2, work connection the course of work in, the oil inlet P of main valve plug 1.1 ' pressure oil by pressure compensation valve element 2.1
Internal galleries 2.3 reach the left side of pressure compensation valve element 2.1, and the right side spring cavity of pressure compensation valve element 2.1 then with it is corresponding
Connected in the load-sensitive chamber LS of main load-sensitive oil circuit f1.When main valve plug 1.1 is in oil inlet P ' connected with actuator port A
During position, the LSA chambers corresponding to f3 connect with LS chambers, and now the LS output signals of main load-sensitive oil circuit f1 depend on working oil
The load pressure of mouth A.When main valve plug 1.1 is in the position that P ' chambers connect with actuator port B, corresponding to the LSB chambers of f2 and LS
Chamber connects, and now the LS output signals of main load-sensitive oil circuit f1 depend on the load pressure of actuator port B.Pressure compensation valve element
2.1 right side LS pressure and spring force is balanced to left side P ' cavity pressures together, it is ensured that main valve plug restriction pressure difference it is constant,
And then ensure that the flow of work connection hydraulic fluid port A1, B1 is impacted not with pressure change.
In addition, can also increase the pad of varying number in the spring cavity bottom of pressure compensation valve element 2.1, it is described to change
The pre compressed magnitude of spring used by pressure compensation valve element 2.1, can thus change pressure difference before and after the restriction of main valve plug 1.1, from
And change the through-current capability of work connection on the premise of main valve plug is changed without.The pre compressed magnitude of spring and the thickness of pad can bases
Flow needs to be designed.
The pressure compensation valve element 2.1 is provided with the shoulder structure 2.2 that can realize that load keeps, the shoulder structure 2.2
With the conical surface positioned at work fluid input port (i.e. P mouthfuls) side of valve body 9 and ' one of the oil inlet P positioned at main valve plug 1.1
The radial direction bearing surface of side.Be can see with reference to Fig. 2 and Fig. 3, when work fluid is passed into for P mouthfuls, the taper of shoulder structure 2.2
Surface moves right the entirety of pressure compensation valve element 2.1 under oil pressure effect, and compresses the spring on right side, and works as shoulder structure
2.2 when moving to P ' chambers correspondence position, can be entered by the space between conical surface and valve opening from P mouthfuls of work fluid
Enter oil inlet P '.
When main valve plug 1.1 and pressure compensation valve element 2.1 are in initial position, even if oil inlet P ' in have pressure oil
Liquid, can make pressure-compensated valve core 2.1 maintain the position for keeping left by the radial direction bearing surface of shoulder structure 2.2, close into
Fluid between hydraulic fluid port P ' and P mouthfuls is connected, so as to reach the effect that load keeps.Kept using individually load compared to existing
The mode of valve, the present embodiment can simplify valve body plug number, simplify valve body structure, so as to reduce valve body casting and difficult processing
Degree, lifts the reliability of banked direction control valves, and conical surface can also reduce work fluid in the case where not influenceing fluid to flow
The pressure loss, it is to avoid unnecessary energy ezpenditure, reduce system heat generation amount, lifting system reliability.
Above-mentioned work connection of the invention can be applied in banked direction control valves, be used especially for load sensing multi-way valve, and use
The engineering machinery of the load sensing multi-way valve, i.e., it is quick present invention provides a kind of load for including aforementioned operation connection embodiment
Sense banked direction control valves and engineering machinery.
Finally it should be noted that:The above embodiments are merely illustrative of the technical solutions of the present invention rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to preferred embodiment to the present invention, and those of ordinary skill in the art should be understood：Still
Specific embodiment of the invention can be modified or equivalent is carried out to some technical characteristics；Without deviating from this hair
The spirit of bright technical scheme, it all should cover in the middle of claimed technical scheme scope of the invention.
Claims (19)
1. a kind of work joins, it is characterised in that including：
Valve body, is inside provided with the main valve plug that can be moved in valve body；
Pilot control selection element, is arranged between the control chamber of the main valve plug and various pilot controls, can be in various elder generations
Selection is supplied to the pilot control of the control chamber of the main valve plug in Oil Guide source.
2. work according to claim 1 joins, it is characterised in that various pilot controls include electric-hydraulic proportion guide oil
Source and hydraulic control pilot control, the pilot control selection element be arranged on the control chamber of the main valve plug respectively with the electro-hydraulic ratio
On oil circuit between example pilot control and the hydraulic control pilot control.
3. work according to claim 2 joins, it is characterised in that in the electric-hydraulic proportion pilot control and the guide oil
Oil circuit between the selection element of source is provided with electric proportional pressure-reducing valve.
4. work according to claim 1 joins, it is characterised in that the pilot control selection element includes pressure selection group
Part, the input port of the pressure selection component connects with various pilot controls respectively, and the pressure selects the output of component
Mouth is connected with the control chamber of the main valve plug, and the maximum hydraulic control of guide's oil pressure can be input into various pilot controls
Signal input to the main valve plug control chamber, to drive the main valve plug to be moved in the valve body.
5. work according to claim 4 joins, it is characterised in that various pilot controls include electric-hydraulic proportion guide oil
Source and hydraulic control pilot control, the pilot control selection element be arranged on the control chamber of the main valve plug respectively with the electro-hydraulic ratio
On oil circuit between example pilot control and the hydraulic control pilot control, the electric-hydraulic proportion pilot control is supplied including automatically controlled guide
Oil circuit and automatically controlled guide's oil return circuit, work connection also include electric proportional pressure-reducing valve, the electric proportional pressure-reducing valve it is normally closed defeated
Entrance and normally opened input port connect with automatically controlled guide's supply oil circuit and automatically controlled guide's oil return circuit respectively, the electricity ratio
Two input ports of the delivery outlet and the hydraulic control pilot control of example pressure-reducing valve respectively with pressure selection component connect.
6. work according to claim 4 joins, it is characterised in that the pressure selection component is shuttle valve or shuttle valve network.
7. work according to claim 5 joins, it is characterised in that before the normally closed input port of the electric proportional pressure-reducing valve
Oil circuit in be additionally provided with filter.
8. work according to claim 7 joins, it is characterised in that also including the guide's end cap being arranged on the valve body,
The electric proportional pressure-reducing valve and the filter are installed on guide's end cap.
9. work according to claim 1 joins, it is characterised in that also including manually operated end cap, be arranged on the valve body
On, and be connected with the main valve plug, can main valve plug described in manual actuation moved in the valve body.
10. work according to claim 1 joins, it is characterised in that also include pressure compensation valve element in the valve body, and
Before the oil inlet of the main valve plug, the pressure compensation valve element is provided with the shoulder structure that can realize that load keeps,
The shoulder structure has positioned at the conical surface of the work fluid input port side of the valve body and positioned at the main valve plug
The radial direction bearing surface of oil inlet side.
11. work connection according to claim 1, it is characterised in that be additionally provided with the valve body and the main valve plug
The jack of each actuator port connection, optionally sets overload valve, Fill valve, overload oil compensating valve or overload on the jack
Fill valve is blocked up.
12. work connection according to claim 11, it is characterised in that the overload oil compensating valve blocking package includes sealing ring, plug
With the plug screw formula mounting seat with hollow oil duct, the plug screw formula mounting seat is arranged in the jack, and by the sealing
Circle is sealed with the jack hole wall, and the plug is removably mounted in the hollow oil duct, in plug described in removal
In the state of, pressure measuring tie-in can be installed in the hollow oil duct.
13. work according to claim 1 connection, it is characterised in that be additionally provided with the valve body main load-sensitive oil circuit,
A plurality of load-sensitive oil circuit and the connection being arranged between the main load-sensitive oil circuit and at least part of load-sensitive oil circuit
Oil circuit, the main load-sensitive oil circuit is connected with the load-sensitive chamber of the main valve plug, and outwards output loading sensitivity oil pressure letter
Number, a plurality of load-sensitive oil circuit is connected with each load-sensitive hydraulic fluid port of the main valve plug respectively, in main valve plug fortune
When moving position corresponding from different workload oil circuits, current work load is corresponded in a plurality of load-sensitive oil circuit
The load-sensitive oil circuit of oil circuit is identical with the main load-sensitive oil circuit pressure, in the main load-sensitive oil circuit, a plurality of load
Sensitive oil circuit and connection oil circuit are provided with oil pressure relief selection device, can realize that the identical or different of each load-sensitive oil circuit is overflow
The setting of flowing pressure.
14. work according to claim 13 connection, it is characterised in that the oil pressure relief selection device include overflow valve and
Oil is stifled, when different oil pressure reliefs are set respectively to each load-sensitive oil circuit, sets oily stifled in the connection oil circuit, and every
The overflow valve of predetermined oil pressure relief is respectively provided with bar load-sensitive oil circuit, when to the identical overflow pressure of each load-sensitive oil circuit setting
During power, the overflow valve of predetermined oil pressure relief is set in a load-sensitive oil circuit, and is set in other load-sensitive oil circuits
Put oil stifled, and keep the connection oil circuit unimpeded.
15. work connection according to claim 13, it is characterised in that also include pressure compensation valve element in the valve body,
And before the oil inlet of the main valve plug, the spring cavity of the pressure compensation valve element connects with the main load-sensitive oil circuit
It is logical.
16. work connection according to claim 15, it is characterised in that in the spring cavity bottom of the pressure compensation valve element also
The pad of varying number can be increased, to change the pre compressed magnitude of spring used by the pressure compensation valve element.
17. work connection according to claim 8, it is characterised in that the filter is plug screw formula filter, Neng Gouan
In the endoporus opened up on guide's end cap.
18. a kind of load sensing multi-way valves, it is characterised in that including any described work connection of claim 1~17.
19. a kind of engineering machinery, it is characterised in that including the load sensing multi-way valve described in claim 18.
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| CN201710109763.3A CN106762916B (en) | 2017-02-28 | 2017-02-28 | Work connection, load sensing multi-way valve and engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710109763.3A CN106762916B (en) | 2017-02-28 | 2017-02-28 | Work connection, load sensing multi-way valve and engineering machinery |
Publications (2)
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| CN106762916A true CN106762916A (en) | 2017-05-31 |
| CN106762916B CN106762916B (en) | 2018-09-04 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110905881A (en) * | 2019-12-24 | 2020-03-24 | 江苏科迈液压控制系统有限公司 | Pilot module for electro-hydraulic compound control and control method thereof |
| CN111486147A (en) * | 2020-06-03 | 2020-08-04 | 江苏科迈液压控制系统有限公司 | Load sensitive proportional multi-way valve |
| CN111749941A (en) * | 2020-06-01 | 2020-10-09 | 合肥长源液压股份有限公司 | Pilot-operated type multi-oil-way control valve group |
| CN113202839A (en) * | 2021-04-13 | 2021-08-03 | 中国煤炭科工集团太原研究院有限公司 | Pilot valve for measuring valve element displacement of multi-way valve |
| CN113931897A (en) * | 2021-11-03 | 2022-01-14 | 徐工集团工程机械股份有限公司 | Load sensitive multi-way valve integrated with multifunctional electric control assembly and engineering machine |
| CN114109941A (en) * | 2021-11-23 | 2022-03-01 | 江苏汇智高端工程机械创新中心有限公司 | Integrated multi-functional hydrovalve oil feed allies oneself with subassembly, hydrovalve |
| CN114165495A (en) * | 2021-11-23 | 2022-03-11 | 江苏汇智高端工程机械创新中心有限公司 | Multi-way valve with independently controlled working link and valve port and engineering machinery |
| CN111486147B (en) * | 2020-06-03 | 2024-04-26 | 江苏科迈液压控制系统有限公司 | Load-sensitive proportional multi-way valve |
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| CN111486147B (en) * | 2020-06-03 | 2024-04-26 | 江苏科迈液压控制系统有限公司 | Load-sensitive proportional multi-way valve |
| CN113202839A (en) * | 2021-04-13 | 2021-08-03 | 中国煤炭科工集团太原研究院有限公司 | Pilot valve for measuring valve element displacement of multi-way valve |
| CN113931897A (en) * | 2021-11-03 | 2022-01-14 | 徐工集团工程机械股份有限公司 | Load sensitive multi-way valve integrated with multifunctional electric control assembly and engineering machine |
| CN113931897B (en) * | 2021-11-03 | 2024-04-30 | 徐工集团工程机械股份有限公司 | Load-sensitive multi-way valve integrated with multifunctional electric control assembly and engineering machinery |
| CN114109941A (en) * | 2021-11-23 | 2022-03-01 | 江苏汇智高端工程机械创新中心有限公司 | Integrated multi-functional hydrovalve oil feed allies oneself with subassembly, hydrovalve |
| CN114165495A (en) * | 2021-11-23 | 2022-03-11 | 江苏汇智高端工程机械创新中心有限公司 | Multi-way valve with independently controlled working link and valve port and engineering machinery |
| CN114165495B (en) * | 2021-11-23 | 2022-10-18 | 江苏汇智高端工程机械创新中心有限公司 | Multi-way valve with independently controlled working link and valve port and engineering machinery |
| WO2023092871A1 (en) * | 2021-11-23 | 2023-06-01 | 江苏汇智高端工程机械创新中心有限公司 | Working link, valve port independent control type multi-way valve, and engineering machine |
| CN114109941B (en) * | 2021-11-23 | 2023-09-26 | 江苏汇智高端工程机械创新中心有限公司 | Integrated multifunctional hydraulic valve oil inlet linkage assembly and hydraulic valve |
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Effective date of registration: 20220722 Address after: 221004 26 Tuo Lan Shan Road, Xuzhou economic and Technological Development Zone, Jiangsu Patentee after: JIANGSU XUGONG ENGINEERING MACHINERY RESEARCH INSTITUTE Co.,Ltd. Address before: 221004 Industrial Zone, Xuzhou Economic Development Zone, Jiangsu, China Patentee before: XCMG CONSTRUCTION MACHINERY Co.,Ltd. |