CN104879336B - Valve back compensation type load-sensitive multitandem valve with bidirectional confluence function - Google Patents
Valve back compensation type load-sensitive multitandem valve with bidirectional confluence function Download PDFInfo
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- CN104879336B CN104879336B CN201510176056.7A CN201510176056A CN104879336B CN 104879336 B CN104879336 B CN 104879336B CN 201510176056 A CN201510176056 A CN 201510176056A CN 104879336 B CN104879336 B CN 104879336B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
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- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a valve back compensation type load-sensitive multitandem valve with a bidirectional confluence function. The valve back compensation type load-sensitive multitandem valve comprises a confluence tandem and two oil inlet operation tandems arranged at two ends of the confluence tandem. The confluence tandem is provided with a confluence valve with the bidirectional confluence function and comprises an electromagnetic valve, a hydraulic control valve, a shuttle valve II and an electro-hydraulic joint control confluence switching valve, an oil inlet tandem and two operation tandems are integrated in each oil inlet operation tandem and each operation tandem comprises a reversing speed-regulation valve and a pressure compensation valve arranged at an outlet of the reversing speed-regulation valve. The confluence tandem is detachably connected with the oil inlet operation tandems on two sides. The output end of the electro-hydraulic joint control confluence switching valve in the confluence tandem is communicated with the operation tandems. The confluence tandem allows oil to flow bidirectionally from p1 to p2 or vice versa, flow speed range of the tandems is broadened, and the executing mechanisms can act more quickly. By the pressure compensation technology, the problem that high-load executing mechanisms have little flow or even no flow when the executing mechanisms act at the same is solved, and action stability is improved.
Description
Technical field
The present invention relates to a kind of banked direction control valves, specifically a kind of be applied to the master file on autocrane, secondary volume, luffing,
The flexible valve post-compensation type load sensing multi-way valve with two-way interflow waiting four kinds of actuators to be controlled, belongs to banked direction control valves skill
Art field.
Background technology
On medium and small at home and abroad tonnage autocrane, wide variety of main manipulation valve typically has two oil-ins at present
P1 and p2, this two oil-in p1 and p2 connect different oil pumps respectively, and the fluid in oil-in p1 and p2 can be as needed
Simultaneously to any one actuator fuel feeding.This main manipulation valve in, fluid can only from p1 to p2 interflow it is impossible to realize p2 to
The interflow in p1 direction, leads to the movement velocity of actuator slowly, working performance is low.
Manipulate the pressure compensation side that valve precompensation is usually adopted on valve in existing medium and small tonnage automobile crane owner
Formula, different operating load multiple actuator action simultaneously when, fluid can the low actuator of preferential supply load pressure,
Actuator coordination is led to reduce.
In order to improve the harmony of composite move, mend after the engineering machinery such as excavator have been widely used based on valve
Repay the load sensing multi-way valve of principle, but not yet apply on medium and small tonnage autocrane at home.Wherein, load-sensitive is
Finger system can provide corresponding flow to reduce energy dissipation according to workload demands；And assignment of traffic refers to multiple
During actuator action simultaneously, if flow system flow can not meet the requirement of live load, make the reduction that actuator is proportional
Flow, with the harmony of safety action.
At present, the Patents file of existing a lot of this respects, as: Chinese patent one disclosed in 21 days June in 2006
Plant double pump confluence type multi-way ratio control valve with load sensitivity information circuit (Patent No.: 200410093222.9), it includes pump i and pump ii
Input interface p1, p2, tank drainback interface t and be connected in parallel telescoping mechanism proportional operating valve, change with described input interface
Width mechanism proportional operating valve, Fu Juan mechanism proportional operating valve, master file mechanism proportional operating valve, are additionally provided with and are connected with pump discharge
Flow divider and relief valve, telescoping mechanism proportional operating valve, jib lubbing mechanism proportional operating valve, Fu Juan mechanism proportional operating valve, master
It is provided with load-sensitive information circuits between volume mechanism proportional operating valve, be provided with single double pump fuel feeding between pump i and pump ii loop certainly
Dynamic switching valve and check valve, automatically select single oil pump feed or double pump fuel feeding.Control flexible, luffing, master file, the changing of Fu Juan mechanism
Connect a decompression compensation valve to speed control valves series, so that actuator movement velocity is not subject to, live load changes affects.It is
A kind of banked direction control valves with load-sensitive function being capable of Dual-pump flow-converging function, but in actual use, exist
Following problem:
1st, in Dual-pump flow-converging function, fluid can only be from input interface p1 to the unidirectional interflow of input interface p2 it is impossible to realize defeated
Incoming interface p1 is to input interface p2, input interface p2 to the two-way interflow of input interface p1；
2nd, banked direction control valves is carrying out composite move, that is, during multiple actuators action simultaneously, preferentially meets live load relatively low
Actuator action, make actuator exercise not harmony.
3rd, the connected mode of hydraulic fluid port is only limitted to threaded, limits range.
Content of the invention
The problem existing for above-mentioned prior art, the present invention provides a kind of load of the valve post-compensation type with two-way interflow quick
Sense banked direction control valves, is capable of several actuators and has good assignment of traffic under different load.
To achieve these goals, the valve post-compensation type load-sensitive multichannel at the two-way interflow of a kind of band that the present invention adopts
Valve, two oil-feed work connection including interflow connection with positioned at interflow connection two ends, the described connection that collaborates has two-way interflow function
Converging valve, collaborates switching valve, the input of described electromagnetic valve and interflow including electromagnetic valve, pilot operated valve device, shuttle valve ii and electro-hydraulic joint control
External control pressure introduction port communicates, and outfan is communicated with the input of shuttle valve ii；The pilot control end of described pilot operated valve device respectively with shuttle
Valve i, oil return line t communicate, and input is communicated with shuttle valve iii, oil return line t respectively, and outfan is communicated with the input of shuttle valve ii；Institute
State electro-hydraulic joint control and collaborate the pilot control end of switching valve and communicate with the outfan of shuttle valve ii, oil return line t respectively, input respectively with
The input interface of pump i discharge capacity, the input interface of pump ii discharge capacity communicate；Described pilot operated valve device, electro-hydraulic joint control interflow switching valve and shuttle valve
Ii is used for realizing reversal valve internal control two-way interflow function；Described oil-feed work connection is integrated with an oil-feed connection and two work connection,
Described work connection includes commutate flow speed control valve and the pressure-compensated valve being arranged on commutation flow speed control valve exit；Described interflow connection and both sides
Oil-feed work connection be detachably connected；The outfan that described electro-hydraulic joint control collaborates switching valve is communicated with each work connection.
Preferably, described electromagnetic valve is two position, three-way electromagnetic change valve, and described pilot operated valve device is two-position three way pilot operated directional control valve,
Described electro-hydraulic joint control interflow switching valve is two-position two-way hydraulic control reversal valve.
Preferably, the pilot control oil pocket of two working oil path in described oil-feed work connection and hydraulic fluid port be integrated in same
On end cap, described end cap includes end cover body, and two being arranged on end cover body electromagnetic valve controls the elder generation of two working oil path respectively
Oil Guide road, stop screw is arranged in the pilot control oil pocket of end cap, and choke plug is arranged on electromagnetic valve oil-out to pilot control
In the pipeline of oil pocket.Wherein, described choke plug can be damping.
Preferably, it is provided with overload oil compensating valve at the work connection in described oil-feed work connection.
Preferably, it is provided with the three-way flow divider valve of overflow valve, pressure shut-off valve and pump input interface in described oil-feed work connection.
Further, also include constant flow rate valve i and constant flow rate valve ii, described constant flow rate valve i and constant flow rate valve ii is arranged on many
On ls loop within the valve valve group of road.
Compared with prior art, the present invention has the advantage that
1. the mainly overall hydraulic parameter of this valve is: rated pressure 350bar, single pumpage 200l/min, Dual-pump flow-converging
400l/min, Hydraulic guide control, control pressure 6-19bar；
2. there are external control and internal control both of which in interflow.Converging valve is normally opened function, and original state is interflow.Dpt3 is external control
Electromagnetic valve, highest priority, during solenoid valves, force converging valve to disconnect.The internal control priority of converging valve is relatively low, when dpt3 breaks
It is in internal control pattern when electric.Information on load loop completely within banked direction control valves for the internal control pattern controlling, with respect to prior art,
Internal control pattern in the present invention allows fluid by p1 to p2 with by p2 to p1 two-way flow, makes each flow speed regulating section more
Greatly, actuator action is rapider.
3. the present invention is improved in Pressure Compensation Technology.In prior art, the entrance in all reversal valves is provided with
Pressure compensator is it is achieved that the stability of multiple actuator action simultaneously and flow.Pressure compensator is arranged on by the present invention
The outlet of reversal valve, when the flow that pump provides can not meet the traffic demand of multiple actuators action simultaneously, (that is: flow is satisfied
With), the flow of each actuating mechanism controls oil circuit of proportional reduction, so that the movement velocity of multiple actuator drops simultaneously
Low, thus the harmony of safety action.Meanwhile, in the present invention, the improvement of Pressure Compensation Technology also overcomes many actuators simultaneously
During action, high capacity actuator flow reduces the problem of even no flow, the stability of raising action.
4. in order to proof load feed back signal (ls pressure signal) stability and signal feedback accuracy with ageing,
The internal ls loop of valve group is provided with the constant flow rate valve of 0.7-1l/min.
5. the ls pressure shut-off valve of this valve group, main safety valve, secondary relief, shuttle valve are both designed as being designed as thread cartridge
Formula structure, convenient maintenance is changed and is debugged.Wherein ls pressure shut-off valve, main safety valve, overload oil compensating valve pressure adjustable, expands valve
The scope of application of group.
6. valve group adopts the fabricated structure of valve block+interflow connection, and both sides work for oil-feed and join, and centre is interflow connection.Both sides
Oil-feed work connection be same foundry goods, each valve body is integrated with 1 oil-feed connection and 2 work connection, so that valve body structure is more stepped up
Gather, reduce faying face and reduce oil leak risk, realize lightweight.Middle interflow connection is detachable, and can design as needed
Different interflow joins to realize required function.Can also be superimposed other between interflow connection and oil-feed work connection and join and return extending work
Way amount is it is achieved that modularity.
7. actuator port adopts flange and helicitic texture.It is suitable for different mounting means, more general.
8. unilateral two adjacent working oil path share a control end cap, and end cap adopts casting structure, reduce size and
Installing space, reduces processing cost.
Brief description
Fig. 1 is the hydraulic schematic diagram of the valve post-compensation type load sensing multi-way valve at the two-way interflow of band of the present invention；
Fig. 2 is the surface structure schematic diagram of the valve post-compensation type load sensing multi-way valve at the two-way interflow of band of the present invention；
Fig. 3 is the structural representation of end cap；
Fig. 4 is for a-a in Fig. 3 to sectional view；
Fig. 5 is for b-b in Fig. 3 to sectional view；
Fig. 6 is the structural representation of end cap other direction.
In figure: 1, o type circle i, 2, choke plug, 3, end cover body, 4, electromagnetic valve i, 5, stop screw, 6, o type circle ii, 7, ball rises
Stifled, 8, electromagnetic valve ii, 9, interflow connection, 10, oil-feed work connection, p1, the input interface of pump i discharge capacity, p2, the input of pump ii discharge capacity connect
Mouthful, r1, overflow valve i, r2, overflow valve ii, rl1, pressure shut-off valve i, rl2, pressure shut-off valve ii, s1, constant flow rate valve i, s2, fixed
Flow valve ii, ra1, overload oil compensating valve i, ra2, overload oil compensating valve ii, rb1, overload oil compensating valve iii, rb2, overload oil compensating valve iv,
Rb3, overload oil compensating valve v, rb4, be overload oil compensating valve vi, ps, electro-hydraulic joint control interflow switching valve, sv1, shuttle valve i, sv2, shuttle valve
Ii, sv3, shuttle valve iii, t1, tank drainback interface i, t2, tank drainback interface ii, s1, constant flow rate valve i, s2, constant flow rate valve ii,
Lpd, hydraulic pressure internal control interflow pilot-actuated valve, dtp3, electromagnetic valve, p3, interflow external control pressure introduction port, ls1, load-sensitive pressure
Delivery outlet i, ls2, load-sensitive pressure output ii, rs1, the three-way flow divider valve of pump i input interface, rs2, pump ii input interface
Three-way flow divider valve.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, a kind of valve post-compensation type load sensing multi-way valve with two-way interflow, including interflow connection and
It is located at two oil-feed work connection at interflow connection two ends, described interflow connection is the converging valve with two-way interflow function, including electromagnetism
Valve dtp3, pilot operated valve device lpd, shuttle valve iisv2 and electro-hydraulic joint control interflow switching valve ps, the input of described electromagnetic valve dtp3 and interflow
External control pressure introduction port p3 communicates, and outfan is communicated with the input of shuttle valve iisv2；The pilot control end of described pilot operated valve device lpd
Communicate with shuttle valve isv1, oil return line t respectively, input is communicated with shuttle valve iiisv3, oil return line t respectively, outfan and shuttle valve
The input of iisv2 communicates；Described electro-hydraulic joint control collaborates the pilot control end output with shuttle valve iisv2 respectively of switching valve ps
End, oil return line t communicate, and input is communicated with the input interface p1 of pump i discharge capacity, the input interface p2 of pump ii discharge capacity respectively；Described
Pilot operated valve device lpd, electro-hydraulic joint control interflow switching valve ps and shuttle valve iisv2 are used for realizing reversal valve internal control two-way interflow function；Described
Oil-feed work connection is integrated with an oil-feed connection and two work connection, and described work connection includes commutating flow speed control valve and being arranged on commutation adjusting
Pressure-compensated valve at fast valve outlet port；Described interflow connection is detachably connected with the oil-feed work connection on both sides；Described electro-hydraulic joint control is closed
The outfan of stream switching valve ps is communicated with each work connection.
Preferably, described electromagnetic valve dtp3 is two position, three-way electromagnetic change valve, and described pilot operated valve device lpd is two-position three way hydraulic control
Reversal valve, described electro-hydraulic joint control interflow switching valve ps is two-position two-way hydraulic control reversal valve.
Preferably, the pilot control oil pocket of two working oil path in described oil-feed work connection and hydraulic fluid port be integrated in same
On end cap, described end cap includes end cover body, and two being arranged on end cover body electromagnetic valve controls the elder generation of two working oil path respectively
Oil Guide road, stop screw 5 is arranged in the pilot control oil pocket of end cap, and choke plug 2 is arranged on electromagnetic valve oil-out and controls to guide
In the pipeline in liquefaction chamber.
Preferably, described choke plug 2 is damping.
Preferably, it is provided with overload oil compensating valve at the work connection in described oil-feed work connection.
Preferably, it is provided with the three-way flow divider valve of overflow valve, pressure shut-off valve and pump input interface in described oil-feed work connection.
As depicted in figs. 1 and 2, c1, c2, c3, c4 be respectively four performance loop commutation speed governing, sc1, sc2, sc3,
Sc4 is respectively the exit air relief valve of c1, c2, c3, c4 commutation flow speed control valve, i.e. pressure-compensated valve；a1、a2、a3、a4、b1、b2、
B3, b4 are to the interface of four actuators；A1, a2, a3, a4, b1, b2, b3, b4 are external pilot pressure input port；l1、
L2, l3, l4 are drain tap, and the specific implementation at interflow is as follows:
1) when each oil circuit does not have action, the maximum working pressure that shuttle valve isv1 feeds back first and second oil circuit is 0, in hydraulic pressure
Control interflow pilot-actuated valve lpd is in left position.During electromagnetic valve dtp3 power-off, collaborate external control pressure introduction port p3 and shuttle valve iisv2
Obstructed, shuttle valve iisv2 feedback maximum pressure is 0, now electro-hydraulic joint control interflow switching valve ps be under spring force two-way
Interflow state；During electromagnetic valve dtp3 energising, interflow external control pressure introduction port p3 is connected with shuttle valve iisv2, and shuttle valve iisv2 feedback is closed
Stream external control pressure introduction port p3 pressure collaborates switching valve ps control end to electro-hydraulic joint control, and now electro-hydraulic joint control collaborates switching valve ps gram
Take spring force to close, do not collaborate；
2) when the first or second working oil path action, third and fourth working oil path are failure to actuate, shuttle valve isv1 feedback first,
The maximum working pressure of two oil circuits collaborates the hydraulic control end of pilot-actuated valve lpd to hydraulic pressure internal control, and pilot control is collaborated in hydraulic pressure internal control
Valve lpd is in right position, and it is 0 to shuttle valve iisv2 that shuttle valve iiisv3 feeds back third and fourth oil circuit pressure.During electromagnetic valve dtp3 power-off, electricity
Liquid joint control interflow switching valve ps is in two-way interflow state under spring force；During electromagnetic valve dtp3 energising, collaborate outer pressure control
Power input port p3 is connected with shuttle valve iisv2, and the pressure of shuttle valve iisv2 feedback interflow external control pressure introduction port p3 closes to electro-hydraulic joint control
Flow switching valve ps control end, now electro-hydraulic joint control interflow switching valve ps overcomes spring force to close, and does not collaborate；
3) when the first or second working oil path action, the 3rd or the 4th working oil path also action, shuttle valve isv1 feedback the
First, the maximum working pressure of two oil circuits collaborates pilot-actuated valve lpd hydraulic control end to hydraulic pressure internal control, and pilot control is collaborated in hydraulic pressure internal control
Valve lpd is in right position, and shuttle valve iiisv3 feeds back third and fourth oil circuit maximum pressure to shuttle valve iisv2.During electromagnetic valve dtp3 power-off,
Shuttle valve iisv2 feeds back third and fourth working oil path maximum pressure and collaborates switching valve ps control end, now electro-hydraulic joint control to electro-hydraulic joint control
Interflow switching valve ps overcomes spring force to close, and does not collaborate；During electromagnetic valve dtp3 energising, collaborate external control pressure introduction port p3 and shuttle valve
Iiisv3 connects, and the maximum pressure of shuttle valve iiisv3 feedback interflow external control pressure introduction port p3 and third and fourth working oil path is to electricity
Liquid joint control collaborates switching valve ps control end, and now electro-hydraulic joint control interflow switching valve ps overcomes spring force to close, and does not collaborate.
Therefore, electro-hydraulic external control pattern has limit priority, and hydraulic pressure internal control pattern can automatically switch according to live load
Interflow mode.
As shown in Fig. 2 this valve group adopts the fabricated structure of valve block adduction stream connection, both sides work for oil-feed and join, and centre is
Interflow connection.The oil-feed work connection on both sides is same foundry goods, and each valve body is integrated with an oil-feed connection and two work connection, makes valve
Body structure is compacter, reduces faying face and reduces oil leak risk, realizes lightweight.Middle interflow connection is detachable and permissible
Design different interflow as needed and join to realize required function.Other connection can also be superimposed between interflow connection and oil-feed work connection
To extend performance loop quantity it is achieved that modularity.Additionally, also the convex of adpting flange can be designed in oil-feed work connection casting
Platform, can be simultaneously suitable for the hydraulic fluid port attachment structure of screw thread and flange.
Unilateral two adjacent working oil path share a control end cap, and end cap adopts casting structure.As Fig. 3 to Fig. 6 institute
Show, end cap is mainly made up of end cover body 3,5, two electromagnetic valves of stop screw and choke plug 2.The pilot control of two working oil path
Oil pocket and hydraulic fluid port are integrated on same end cap, and two electromagnetic valves control the guide's oil circuit of two working oil path clearly.Spacing spiral shell
Nail 5 is arranged in the pilot control oil pocket of end cap, and choke plug 2 is arranged on electromagnetic valve oil-out to the pipeline of pilot control oil pocket
In.
Additionally, in order to the stability of signal (ls pressure signal) and the accuracy of signal feedback and timeliness are fed back in proof load
Property, the constant flow rate valve of 0.7-1l/min, the constant flow rate valve is1 in such as Fig. 1 and constant flow can be set in the internal ls loop of valve group
Valve iis2.Pressure shut-off valve in the present invention, main safety valve, secondary relief, shuttle valve can be both designed as screw thread inserting type structure,
It is more convenient for installing and dismounting.Wherein, the pressure shut-off valve in ls loop, main safety valve, overload oil compensating valve pressure all adjustable.
From said structure, the present invention has the advantage that
1. the mainly overall hydraulic parameter of this valve is: rated pressure 350bar, single pumpage 200l/min, Dual-pump flow-converging
400l/min, Hydraulic guide control, control pressure 6-19bar；
2. there are external control and internal control both of which in interflow.Converging valve is normally opened function, and original state is interflow.Dpt3 is external control
Electromagnetic valve, highest priority, during solenoid valves, force converging valve to disconnect.The internal control priority of converging valve is relatively low, when dpt3 breaks
It is in internal control pattern when electric.Information on load loop completely within banked direction control valves for the internal control pattern controlling, with respect to prior art,
Internal control pattern in the present invention allows fluid by p1 to p2 with by p2 to p1 two-way flow, makes each flow speed regulating section more
Greatly, actuator action is rapider.
3. the present invention is improved in Pressure Compensation Technology.In prior art, the entrance in all reversal valves is provided with
Pressure compensator is it is achieved that the stability of multiple actuator action simultaneously and flow.Pressure compensator is arranged on by the present invention
The outlet of reversal valve, when the flow that pump provides can not meet the traffic demand of multiple actuators action simultaneously, (that is: flow is satisfied
With), the flow of each actuating mechanism controls oil circuit of proportional reduction, so that the movement velocity of multiple actuator drops simultaneously
Low, thus the harmony of safety action.Meanwhile, in the present invention, the improvement of Pressure Compensation Technology also overcomes many actuators simultaneously
During action, high capacity actuator flow reduces the problem of even no flow, the stability of raising action.
4. in order to proof load feed back signal (ls pressure signal) stability and signal feedback accuracy with ageing,
The internal ls loop of valve group is provided with the constant flow rate valve of 0.7-1l/min.
5. the ls pressure shut-off valve of this valve group, main safety valve, secondary relief, shuttle valve are both designed as being designed as thread cartridge
Formula structure, convenient maintenance is changed and is debugged.Wherein ls pressure shut-off valve, main safety valve, overload oil compensating valve pressure adjustable, expands valve
The scope of application of group.
6. valve group adopts the fabricated structure of valve block+interflow connection, and both sides work for oil-feed and join, and centre is interflow connection.Both sides
Oil-feed work connection be same foundry goods, each valve body is integrated with 1 oil-feed connection and 2 work connection, so that valve body structure is more stepped up
Gather, reduce faying face and reduce oil leak risk, realize lightweight.Middle interflow connection is detachable, and can design as needed
Different interflow joins to realize required function.Can also be superimposed other between interflow connection and oil-feed work connection and join and return extending work
Way amount is it is achieved that modularity.
7. actuator port adopts flange and helicitic texture.It is suitable for different mounting means, more general.
8. unilateral two adjacent working oil path share a control end cap, and end cap adopts casting structure, reduce size and
Installing space, reduces processing cost.
Claims (7)
1. a kind of valve post-compensation type load sensing multi-way valve with two-way interflow is it is characterised in that including interflow connection and being located at conjunction
Two oil-feed work connection at stream connection two ends, described interflow connection is the converging valve with two-way interflow function, including electromagnetic valve
(dtp3), pilot operated valve device (lpd), shuttle valve ii (sv2) and electro-hydraulic joint control interflow switching valve (ps), the input of described electromagnetic valve (dtp3)
End is communicated with interflow external control pressure introduction port (p3), and outfan is communicated with the input of shuttle valve ii (sv2)；Described pilot operated valve device
(lpd) pilot control end is communicated with shuttle valve i (sv1), oil return line t respectively, input respectively with shuttle valve iii (sv3), oil return line
T communicates, and outfan is communicated with the input of shuttle valve ii (sv2)；Described electro-hydraulic joint control collaborates the pilot control end of switching valve (ps)
Communicate with the outfan of shuttle valve ii (sv2), oil return line t respectively, input input interface (p1), the pump ii with pump i discharge capacity respectively
The input interface (p2) of discharge capacity communicates；Described pilot operated valve device (lpd), electro-hydraulic joint control interflow switching valve (ps) and shuttle valve ii (sv2) use
In realizing reversal valve internal control two-way interflow function；Described oil-feed work connection is integrated with an oil-feed connection and two work connection, described
Work connection includes commutate flow speed control valve and the pressure-compensated valve being arranged on commutation flow speed control valve exit；Described interflow connection is entered with both sides
Oil work connection is detachably connected；The outfan that described electro-hydraulic joint control collaborates switching valve (ps) is communicated with each work connection.
2. a kind of valve post-compensation type load sensing multi-way valve with two-way interflow according to claim 1 it is characterised in that
Described electromagnetic valve (dtp3) is two position, three-way electromagnetic change valve, and described pilot operated valve device (lpd) is two-position three way pilot operated directional control valve, described
Electro-hydraulic joint control interflow switching valve (ps) is two-position two-way hydraulic control reversal valve.
3. a kind of valve post-compensation type load sensing multi-way valve with two-way interflow according to claim 1 it is characterised in that
The pilot control oil pocket of two working oil path in described oil-feed work connection and hydraulic fluid port are integrated on same end cap, described end cap
Including end cover body, two being arranged on end cover body electromagnetic valve controls the guide's oil circuit of two working oil path, stop screw respectively
(5) it is arranged in the pilot control oil pocket of end cap, choke plug (2) is arranged on electromagnetic valve oil-out to the pipeline of pilot control oil pocket
In.
4. a kind of valve post-compensation type load sensing multi-way valve with two-way interflow according to claim 3 it is characterised in that
Described choke plug (2) is damping.
5. a kind of valve post-compensation type load sensing multi-way valve with two-way interflow according to claim 1 it is characterised in that
It is provided with overload oil compensating valve at work connection in described oil-feed work connection.
6. a kind of valve post-compensation type load sensing multi-way valve with two-way interflow according to claim 1 it is characterised in that
It is provided with the three-way flow divider valve of overflow valve, pressure shut-off valve and pump input interface in described oil-feed work connection.
7. a kind of valve post-compensation type load sensing multi-way valve with two-way interflow according to claim 1 it is characterised in that
Also include constant flow rate valve i (s1) and constant flow rate valve ii (s2), described constant flow rate valve i (s1) and constant flow rate valve ii (s2) are arranged on many
On ls loop within the valve valve group of road.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510176056.7A CN104879336B (en) | 2015-04-14 | 2015-04-14 | Valve back compensation type load-sensitive multitandem valve with bidirectional confluence function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510176056.7A CN104879336B (en) | 2015-04-14 | 2015-04-14 | Valve back compensation type load-sensitive multitandem valve with bidirectional confluence function |
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| CN104879336B true CN104879336B (en) | 2017-01-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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