CN206655852U - 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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- CN206655852U CN206655852U CN201720180240.3U CN201720180240U CN206655852U CN 206655852 U CN206655852 U CN 206655852U CN 201720180240 U CN201720180240 U CN 201720180240U CN 206655852 U CN206655852 U CN 206655852U
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Abstract
A kind of work connection, load sensing multi-way valve and engineering machinery are the utility model is related to, work connection includes：Valve body, it is interior provided with the main valve plug that can be moved in valve body；Pilot control selection element, it is arranged between the control chamber of the main valve plug and a variety of pilot controls, can selects to be supplied to the pilot control of the control chamber of the main valve plug in a variety of pilot controls.The utility model between the control chamber of main valve plug and a variety of pilot controls by setting pilot control selection element, to realize selection of the control chamber of main valve plug in different pilot control modes, so as to increase control redundancy, improves control reliability.
Description
Technical field
The utility model is related 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 (such as 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, for controlling the uninterrupted and flow direction of hydraulic oil, so as to which centralized Control engineering machinery is held
The direction of motion and speed of units.
The banked direction control valves of engineering machinery mainly has traditional banked direction control valves, minus flow banked direction control valves, positive flow banked direction control valves, load at present
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
Flux and flow direction loads smaller executive component and causes flow therefore, right it is anticipated that state is allocated during composite move
The higher construction machinery hydraulic system of control accuracy requirement uses load sensing multi-way valve more.
In 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, also settable overflow valve, Fill valve, LS overflow valves, load holding valve etc..Also settable LS pressure on valve body
Oil duct is selected, selection corresponds to the high pressure of different operating hydraulic fluid port (such as A, B mouth etc.) in the course of the work, is controlled as pumpage
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, it is only capable of realizing single precursor control by hand, Hydraulic guide control, the control of electric proportion pilot, and can not be simultaneously real
Two or more existing control mode.After single control mode failure, main computer boxes then cisco unity malfunction, or even meeting
Appearance accident.
Utility model content
The purpose of this utility model is to propose a kind of work connection, load sensing multi-way valve and engineering machinery, can be selective
Realize different pilot control modes.
To achieve the above object, the utility model provides a kind of work connection, including：
Valve body, it is interior provided with the main valve plug that can be moved in valve body；
Pilot control selection element, it is arranged between the control chamber of the main valve plug and a variety of pilot controls, can be more
Selection is supplied to the pilot control of the control chamber of the main valve plug in kind pilot control.
Further, a variety of 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 pressure selection component, the input of the pressure selection component
Mouth connects with a variety of pilot controls respectively, and the control chamber of the delivery outlet and the main valve plug of the pressure selection component connects
It is logical, the hydraulic control signal that guide's oil pressure maximum is inputted in a variety of 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, a variety of 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 automatically controlled guide and 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 connect 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, in addition to guide's end cap for being arranged on the valve body, the electric proportional pressure-reducing valve and the filtering
Device is installed on guide's end cap.
Further, in addition to 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 moves 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 is kept, and the shoulder structure, which has, is located 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 to block up on jack.
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 by the sealing ring and the jack hole wall, described
Plug is removably mounted in the hollow oil duct, can in the hollow oil duct in the state of plug described in removal
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 is arranged on
Connection oil circuit between the main load-sensitive oil circuit and at least part 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
Connect, moved in the main valve plug corresponding from different workload oil circuits with each load-sensitive hydraulic fluid port of the main valve plug
Position when, correspond in a plurality of load-sensitive oil circuit load-sensitive oil circuit of current work load oil circuit with it is main load it is quick
It is identical to feel oil circuit pressure, 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, the setting of the identical or different oil pressure relief of each load-sensitive oil circuit can be realized.
Further, the oil pressure relief selection device includes overflow valve and oil blocks up, and distinguishes when to each load-sensitive oil circuit
When setting different oil pressure reliefs, set oil 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 sets oil stifled in other load-sensitive oil circuits, and keeps 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 in the pressure compensation valve element.
Further, the filter is plug screw formula filter, can be opened up on guide's end cap interior
Kong Zhong.
To achieve the above object, the utility model provides a kind of load sensing multi-way valve, including foregoing work connection.
To achieve the above object, the utility model provides a kind of engineering machinery, including foregoing load sensing multi-way valve.
Based on above-mentioned technical proposal, the utility model between the control chamber of main valve plug and a variety of pilot controls by setting
Pilot control selection element, to realize selection of the control chamber of main valve plug in different pilot control modes, so as to increase control
Redundancy, improve control reliability.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, forms the part of the application,
Schematic description and description of the present utility model is used to explain the utility model, does not form to of the present utility model improper
Limit.In the accompanying drawings：
Fig. 1 is the hydraulic principle schematic diagram of an embodiment of utility model works connection.
Fig. 2 is the cross-sectional view that utility model works join embodiment.
Fig. 3 is the cross-sectional view that utility model works join pressure-compensated valve in embodiment.
Fig. 4 is the cross-sectional view that utility model works join overload oil compensating valve plug in embodiment.
Fig. 5 is the structural representation for the LOOK RIGHT degree that utility model works join 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 that utility model works join guide's end cap in embodiment.
Figure 11 is the hydraulic principle schematic diagram of another embodiment of utility model works connection.
Embodiment
Below by drawings and examples, the technical solution of the utility model is described in further detail.
As shown in figure 1, the hydraulic principle schematic diagram of the embodiment for utility model works connection.With reference to shown in Fig. 2
Structural representation, the work connection in the present embodiment include valve body 9 and pilot control selection element, provided with can be in valve in valve body 9
The main valve plug 1.1 of motion in body 9, pilot control selection element be arranged on main valve plug 1.1 control chamber and a variety of pilot controls it
Between, it can select to be supplied to the pilot control of the control chamber of the main valve plug 1.1 in a variety of pilot controls.
A variety of pilot controls can include the hydraulic oil source of a variety of different guide's forms, such as be shown in Fig. 1 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 on the oil circuit between the electric-hydraulic proportion pilot control and described hydraulic control pilot control a1, b1, such pilot control choosing
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
Source a1, b1 pressure oil, 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, it can ensure that work connection still can work on by switching another pilot control, so that it is guaranteed that operation is set
It is standby to run well, avoid the generation of accident.
Pilot control selection element includes pressure selection component, and shuttle valve 3.1 and shuttle valve 3.2 are employed in Fig. 1 embodiments
Component is selected as pressure.In another embodiment if shuttle valve net can also be used when being related to the pilot control of more than three
Network selects component as pressure.In annexation, the input port of pressure selection component connects with a variety of pilot controls respectively, and
The delivery outlet of pressure selection component connects with the control chamber of main valve plug 1.1.The oil pressure provided by more different pilot controls, will
The control chamber that the maximum hydraulic control signal of guide's oil pressure is input to the main valve plug 1.1 is inputted in a variety of pilot controls, to drive
The main valve plug 1.1 is moved to move in the valve body 9.
In Fig. 1, electric-hydraulic proportion pilot control may particularly include automatically controlled guide and supply oil circuit X and automatically controlled guide's oil return circuit
Y.Automatically controlled guide, which supplies oil circuit X, can use outer oil passage, can also be by the way of internal oil passages are by 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 can be added in work joins and electric ratio subtracts
Pressure valve 4.2, the control chamber of the both sides of main valve plug 1.1 is corresponded to 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.By to electric ratio
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.
Require higher in view of banked direction control valves pilot mechanism precision and oil cleanliness, and engineering machinery working environment is disliked
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
Device 8 is filtered, 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 function simple in construction is reliable, 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 figure 1, when work connection uses electrichydraulic control pattern, join connected executive component from work if necessary to work
Join 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, electric proportional pressure-reducing valve 4.2 keeps losing
Electricity condition, guide's fluid that oil circuit X is now supplied from automatically controlled guide arrive shuttle valve 3.1 by electric proportional pressure-reducing valve 4.1, and now
The illogical guide's fluid of oil circuit corresponding to hydraulic control pilot control a1, therefore the guide that oil circuit X is supplied from automatically controlled guide selected
Fluid is reached on main valve plug 1.1 close to the control chamber of actuator port B one end by shuttle valve 3.1, promotes main valve plug 1.1 to opposite side
It is mobile, make the work fluid of the P mouths from work connection (being to come from valve body 9 in fig. 2) via pressure-compensated valve 2, oil inlet
Work connection hydraulic fluid port A1 is reached after P ', actuator port A, work connection hydraulic fluid port B1 is returned after executive component, then via actuator port B
Return to the T mouths of work connection.
If necessary to work, the connected executive component of connection joins hydraulic fluid port B1 oil-feeds from work, 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 supplies oil circuit X's from automatically controlled guide
Guide's fluid arrives shuttle valve 3.2 by electric proportional pressure-reducing valve 4.2, and now oil circuit corresponding to hydraulic control pilot control b1 does not lead to guide oil
Liquid, thus select from automatically controlled guide supply oil circuit X guide's fluid pass through shuttle valve 3.2 reach it is close on main valve plug 1.1
The control chamber of actuator port A one end, promote main valve plug 1.1 to be moved to opposite side, make the work fluid warp of the P mouths from work connection
By pressure-compensated valve 2, oil inlet P ', work connection hydraulic fluid port B1 is reached after actuator port B, work connection oil is returned after executive component
Mouth A1, then the T mouths via actuator port A return work connection.
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, join connected executive component if necessary to work and join hydraulic fluid port A1 oil-feeds, work connection hydraulic fluid port B1 oil returns, then from hydraulic control from work
Pilot control a1 guide's fluid 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 reached on main valve plug 1.1 by shuttle valve 3.1
Control chamber close to actuator port B one end, promote main valve plug 1.1 to be moved to opposite side, make the working oil of the P mouths from work connection
Liquid is via pressure-compensated valve 2, oil inlet P ', work connection hydraulic fluid port A1 is reached after actuator port A, work is returned after executive component
Join hydraulic fluid port B1, then the T mouths of work connection are returned via actuator port B.
If necessary to work, the connected executive component of connection joins hydraulic fluid port B1 oil-feeds from work, work connection hydraulic fluid port A1 oil returns, then comes
From hydraulic control pilot control b1 guide's fluid directly reach shuttle valve 3.2, and now the other end inlet communication of shuttle valve 3.2 is electricity
Guide oil return circuit Y is controlled, therefore the guide's fluid from hydraulic control pilot control b1 selected reaches main valve plug by shuttle valve 3.2
Close to the control chamber of actuator port A one end on 1.1, promote main valve plug 1.1 to be moved to opposite side, make the P mouths from work connection
Fluid work via pressure-compensated valve 2, oil inlet P ', work connection hydraulic fluid port B1 is reached after actuator port B, returned after executive component
Work connection hydraulic fluid port A1 is returned, then the T mouths of work connection are returned via actuator port A.
In another embodiment, manually operated end cap can also be included, in other words made guide's end cap into manually operated
End cap, the end cap are arranged on valve body 9, and are connected with the main valve plug 1.1, can main valve plug 1.1 described in manual actuation in institute
State in valve body 9 and move.The setting of end cap is manually operated, the work connection or even load sensing multi-way valve can be made to realize electricity
Three kinds of liquid proportional control, hydraulic control and manual control control models.
In fig. 2, load-sensitive chamber LS (abbreviation LS chambers) and main load-sensitive oil circuit f1 (abbreviation f1 oil ducts) phase in Fig. 1
Connection, load-sensitive hydraulic fluid port LSA (abbreviation LSA chambers) are connected with the load-sensitive oil circuit f3 (abbreviation f3 oil ducts) in Fig. 1, load
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 positions work
When making, valve element moves to right, and LS chambers are connected with LSA chambers, and now f1, f3 oil duct pressure are identical, is A mouth pressure；When being worked in B positions,
Valve element moves to left, and LS chambers are connected with LSB chambers, and now f1, f2 oil duct pressure are identical, is B mouth pressure.If desired outwards output f3 is pressed
Power, then the f6 oil ducts (correspond to MA oil ducts in Fig. 1) in Fig. 8 can be used, the plug in f6 oil ducts is removed and loads onto pressure measurement and connects
Head；Need outwards to export f2 pressure, be the f5 oil ducts (the MB oil ducts corresponded in Fig. 1) in Fig. 6, will be stifled in f5 oil ducts
Head, which removes, loads onto pressure measuring tie-in.
The jack connected respectively with each working oil chamber A, B of main valve plug 1.1 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 include sealing ring 13.1, sealing ring 13.2, plug 10.2 and have hollow oil duct
Plug screw formula mounting seat 11, plug screw formula mounting seat 11 is arranged in the jack, and passes through 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 needing to measure the work
, can be by the removal of plug 10.2 during the oil pressure of hydraulic fluid port, and pressure measuring tie-in is installed to realize pressure measuring function in the hollow oil duct.Phase
Than installing three-way connection additional on external oil duct in existing needs to detect the mode of hydraulic fluid port pressure, the present embodiment not only reduces
Cost and the pressure loss point of system, and without being limited by installing space.
After plug screw formula mounting seat 11 is removed, overload valve, Fill valve or overload repairing can also be installed as needed
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 limits, Fill valve can be only installed in overload oil compensating valve jack.
When main frame operating mode has overload protection simultaneously to be needed to need with repairing function, 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 stifled.Therefore, not only applicability is good and simple in construction for the structure of realizing of the present embodiment, and test is 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 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 arrive by check valve
Control and the discharge capacity of the pump of load sensing multi-way valve cooperation are 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, then pressed corresponding to load-sensitive the oil circuit f2 or f3 of current work load oil circuit 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, when work joins the working position of 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, it is stifled (such as auxetic stifled etc.) to may particularly include overflow valve and oil for oil pressure relief selection device, when to each
When load-sensitive oil circuit sets different oil pressure reliefs respectively, set oil 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 pass through overflow valve 5.1
Be arranged to overflow valve 5.2 it is different, to meet the needs of different overflow requirements.
It is foregoing by different loads except that can use when needing to set identical oil pressure relief to each load-sensitive oil circuit
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 oil 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
Valve, and the connection oil circuit f4 between 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, reduce valve body on plug number, improve valve body it is reliable
Property.
In fig. 2, it is the pressure compensation valve element 2.1 of setting in valve body 9 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 pass through 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 main load-sensitive oil circuit f1 load-sensitive chamber LS.When main valve plug 1.1 is in oil inlet P ' connected with actuator port A
During position, connected corresponding to f3 LSA chambers with LS chambers, now main load-sensitive oil circuit f1 LS output signals depend on working oil
Mouth A load pressure.When main valve plug 1.1 is in the position that P ' chambers connect with actuator port B, corresponding to f2 LSB chambers and LS
Chamber connects, and now main load-sensitive oil circuit f1 LS output signals depend on actuator port B load pressure.Pressure compensation valve element
2.1 right side LS pressure and spring force is balanced to left side P ' cavity pressures together, ensures the constant of main valve plug restriction pressure difference,
And then ensure that work connection hydraulic fluid port A1, B1 flow are impacted not with pressure change.
In addition, the pad of varying number can also be increased in the spring cavity bottom of pressure compensation valve element 2.1, with described in change
The pre compressed magnitude of spring used in 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 is kept, the shoulder structure 2.2
With the conical surface positioned at work fluid input port (i.e. P mouths) 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.It can see with reference to Fig. 2 and Fig. 3, when P mouths are passed into work fluid, the taper of shoulder structure 2.2
Surface makes pressure compensation valve element 2.1 is overall to move right under oil pressure effect, and compresses the spring on right side, and works as shoulder structure
2.2 when moving to P ' chamber correspondence positions, and the work fluid from P mouths can be entered by the space between conical surface and valve opening
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, by the radial direction bearing surface of shoulder structure 2.2 pressure-compensated valve core 2.1 can be made to maintain the position to keep left, close into
Fluid between hydraulic fluid port P ' and P mouths connects, so as to have the function that load is kept.Kept compared to existing using individually load
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, the reliability of banked direction control valves is lifted, and conical surface can also reduce work fluid in the case where not influenceing fluid flowing
The pressure loss, avoid unnecessary energy expenditure, reduce system heat generation amount, lifting system reliability.
Above-mentioned work connection of the present utility model can be applied in banked direction control valves, be used especially for load sensing multi-way valve, and
Using the engineering machinery of the load sensing multi-way valve, i.e. the utility model also provides one kind and includes aforementioned operation connection embodiment
Load sensing multi-way valve and engineering machinery.
Finally it should be noted that:Above example is only illustrating the technical solution of the utility model rather than it is limited
System；Although the utility model is described in detail with reference to preferred embodiment, those of ordinary skill in the art should
Understand：Specific embodiment of the present utility model can still be modified or some technical characteristics are equally replaced
Change；Without departing from the spirit of technical solutions of the utility model, it all should cover in the claimed technical scheme of the utility model
Among scope.
Claims (19)
1. one kind work connection, it is characterised in that including：
Valve body, it is interior provided with the main valve plug that can be moved in valve body；
Pilot control selection element, it is arranged between the control chamber of the main valve plug and a variety of pilot controls, can be in a variety of elder generations
Selection is supplied to the pilot control of the control chamber of the main valve plug in Oil Guide source.
2. work connection according to claim 1, it is characterised in that a variety of 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 connection according to claim 2, 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 connection according to claim 1, it is characterised in that the pilot control selection element includes pressure selection group
Part, the input port of the pressure selection component connect with a variety of pilot controls respectively, the output of the pressure selection component
Mouth is connected with the control chamber of the main valve plug, and the maximum hydraulic control of guide's oil pressure can will be inputted in a variety of pilot controls
Signal is input to the control chamber of the main valve plug, to drive the main valve plug to be moved in the valve body.
5. work connection according to claim 4, it is characterised in that a variety of 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 electric 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 connection according to claim 4, it is characterised in that the pressure selection component is shuttle valve or shuttle valve network.
7. work connection according to claim 5, 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 connection according to claim 7, it is characterised in that also include 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 connection according to claim 1, 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, main valve plug it can be moved described in manual actuation in the valve body.
10. work connection according to claim 1, 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 is kept,
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 blocks 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 passes through 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 load-sensitive oil circuit
Oil circuit, the main load-sensitive oil circuit connect 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 connects with each load-sensitive hydraulic fluid port of the main valve plug respectively, is transported in the main valve plug
Move from different workload oil circuits corresponding to position when, correspond to current work load 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 setting different oil pressure reliefs respectively to each load-sensitive oil circuit, sets oil 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
It is stifled to put oil, and keeps 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 in the pressure compensation valve element.
17. work according to claim 8 connection, 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 valve, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720180240.3U CN206655852U (en) | 2017-02-28 | 2017-02-28 | Work connection, load sensing multi-way valve and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720180240.3U CN206655852U (en) | 2017-02-28 | 2017-02-28 | Work connection, load sensing multi-way valve and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206655852U true CN206655852U (en) | 2017-11-21 |
Family
ID=60314297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720180240.3U Expired - Fee Related CN206655852U (en) | 2017-02-28 | 2017-02-28 | Work connection, load sensing multi-way valve and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206655852U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762916A (en) * | 2017-02-28 | 2017-05-31 | 徐工集团工程机械有限公司 | Work connection, load sensing multi-way valve and engineering machinery |
| CN109737111A (en) * | 2019-01-28 | 2019-05-10 | 日照海卓液压有限公司 | It is a kind of with the multi-way valve based on one-way or bi-directional hydraulic lock consubstantiality repairing function |
-
2017
- 2017-02-28 CN CN201720180240.3U patent/CN206655852U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762916A (en) * | 2017-02-28 | 2017-05-31 | 徐工集团工程机械有限公司 | Work connection, load sensing multi-way valve and engineering machinery |
| CN106762916B (en) * | 2017-02-28 | 2018-09-04 | 徐工集团工程机械有限公司 | Work connection, load sensing multi-way valve and engineering machinery |
| CN109737111A (en) * | 2019-01-28 | 2019-05-10 | 日照海卓液压有限公司 | It is a kind of with the multi-way valve based on one-way or bi-directional hydraulic lock consubstantiality repairing function |
| CN109737111B (en) * | 2019-01-28 | 2024-01-02 | 日照海卓液压有限公司 | Multi-way valve with one-way or two-way hydraulic lock integrated oil supplementing function |
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