CN105570491B - Load sensing multi-way valve, load sensitive system and excavator - Google Patents
Load sensing multi-way valve, load sensitive system and excavator Download PDFInfo
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- CN105570491B CN105570491B CN201410554873.7A CN201410554873A CN105570491B CN 105570491 B CN105570491 B CN 105570491B CN 201410554873 A CN201410554873 A CN 201410554873A CN 105570491 B CN105570491 B CN 105570491B
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Abstract
The present invention relates to a kind of load sensing multi-way valve, load sensitive system and excavator, wherein, load sensing multi-way valve includes oil-feed and joins and work connection, oil-feed connection includes oil-feed connection valve body, signal amplifying valve is provided with oil-feed connection valve body, oil inlet on the oil inlet connection oil-feed connection valve body of signal amplifying valve, load pressure port on the spring side control chamber connection oil-feed connection valve body of signal amplifying valve, the load pressure oil circuit of load pressure port connection work connection on oil-feed connection valve body, the load-sensitive port joined without spring control chamber and oil-feed on valve body of the oil-out communications signals amplifying valve of signal amplifying valve, the load-sensitive oil circuit of load-sensitive port connection work connection on oil-feed connection valve body；The load-sensitive port that load pressure control signal from work connection is joined after the amplification of signal amplifying valve by oil-feed on valve body exports.The present invention solves the problems, such as the decay of load pressure control signal.
Description
Technical field
The present invention relates to engineering machinery field, more particularly to a kind of load sensing multi-way valve, load sensitive system and excavation
Machine.
Background technology
Banked direction control valves is to be combined by several simply connected reversal valves and several such as safety overflow valves, check valve auxiliary valve one
The pile-up valve risen, it is compact-sized, it is widely used in mechanically moving.Banked direction control valves is divided into two kinds of structures of monoblock type and chip, the former
Complicated, technology difficulty is big, and the latter joins by oil-feed, commutate connection and fuel-displaced valve block is combined, simple in construction, manufacturability
Good and combination is flexible.
Existing load sensing multi-way valve, which can be applied, including multiple executing agencies and is having an engineering machinery of composite move
In, form load-sensitive hydraulic system with the hydraulic pump with pressure compensator.Maximum load pressure controling signal acts on hydraulic pressure
On the pressure compensator of pump, pressure compensator experiences the pressure-flow demand of system and when system condition changes, according to flow
Demand provides adjustable flow.The pressure of pressure compensator is set as a relatively low fixed value, so that pump pressure exceeds highest
One relatively low fixed value of load pressure, and constantly adjusted with highest load pressure, system is avoided flow loss.
But the collection point of load pressure control signal is typically before each reversal valve in existing load sensing multi-way valve
Or after reversal valve, then the load pressure feedback passage of reversing valve connecting by check valve and runner or is directly connected to by runner
On, join eventually through oil-feed connection or tail by signal output, be applied to by connecting line on hydraulic pump compensator, the stream of controlling pump
Amount.Because the connecting line between banked direction control valves and hydraulic pump is very long, and the change of load sensing multi-way valve inner flow passage is more, causes most
When heavy load pressure controling signal feeds back to the compensator of hydraulic pump through banked direction control valves internal oil passages and connecting line, decline of pressure compared with
Greatly, to ensure that regime flow must heighten the pressure set points of pressure compensator, but so larger flow can be caused to damage
Lose.
The content of the invention
The purpose of the present invention is to propose to a kind of load sensing multi-way valve, load sensitive system and excavator, and it can solve the problem that
Due to the problem of maximum load pressure controling signal for feeding back to hydraulic pump is decayed, and caused system energy loss increases.
To achieve the above object, the invention provides a kind of load sensing multi-way valve, it includes oil-feed connection and work connection, institute
Stating oil-feed connection includes oil-feed connection valve body, and signal amplifying valve, the oil-feed of the signal amplifying valve are provided with the oil-feed connection valve body
Mouth connects the oil inlet on the oil-feed connection valve body, and the spring side control chamber of the signal amplifying valve connects the oil-feed connection valve body
On load pressure port, the load pressure port on oil-feed connection valve body connects the load pressure oil circuit of the work connection,
It is negative on valve body that the oil-out of the signal amplifying valve connects joining without spring control chamber and the oil-feed for the signal amplifying valve
Sensitive ports are carried, the load-sensitive port that the oil-feed joins on valve body connects the load-sensitive oil circuit of the work connection；From institute
State work connection load pressure control signal by the signal amplifying valve amplification after by the oil-feed join valve body on load
Sensitive ports export；The oil inlet of the oil-feed connection valve body also connects the pressure oil port of the oil-feed connection valve body, the oil-feed
Join pressure oil port and the pressure oil communication of work connection of valve body, pressure oil is provided for system.
One preferably or in alternative embodiment, oil inlet and the oil-feed on oil-feed connection valve body of the signal amplifying valve
The second damping is provided with the oil circuit of mouth connection；The spring side control chamber of the signal amplifying valve joins on valve body with the oil-feed
The 3rd damping is provided with the oil circuit of load pressure port connection；The oil-out of the signal amplifying valve and the signal amplifying valve
Without spring control chamber connection oil circuit on be provided with the 4th damping.
One preferably or in alternative embodiment, middle position unloading valve is additionally provided with the oil-feed connection valve body, the middle position is unloaded
The oil inlet of lotus valve connects the oil inlet of the oil-feed connection valve body, and the oil-out of the middle position unloading valve connects the oil-feed connection valve
The oil return opening of body, the spring cavity of the middle position unloading valve connect the oil-out of the signal amplifying valve and the load-sensitive end
Mouthful；The oil inlet of the middle position unloading valve connects with the middle position unloading valve without spring cavity, and in the oil-feed of middle position unloading valve
Mouth is with being provided with the 5th damping on the oil circuit connected without spring cavity of the middle position unloading valve；Under working condition, during closing is described
Position unloading valve, flow is provided for working oil path.
One preferably or in alternative embodiment, pressure compensation choke valve, the pressure are additionally provided with the oil-feed connection valve body
The oil inlet of force compensating choke valve connects the load pressure port on the oil-feed connection valve body, and the pressure compensation choke valve goes out
Hydraulic fluid port connects the oil return opening on the oil-feed connection valve body；Load pressure control signal is carried out by the pressure compensation choke valve
Filtering.
One preferably or in alternative embodiment, safety valve is additionally provided with the oil-feed connection valve body, the safety valve enters
Hydraulic fluid port connects the oil inlet of oil-feed connection valve body, the oil-out of the safety valve connect the middle position unloading valve oil-out and
The oil return opening of the oil-feed connection valve body；When high pressure occurs in system exception situation, the safety valve plays a part of protection system.
One preferably or in alternative embodiment, the pressure compensation choke valve includes pressure compensation throttling valve body, pressure
Be sequentially connected in series in compensation throttling valve body on oil circuit from the oil inlet of pressure compensation choke valve to oil-out be provided with filter,
6th damping and pressure-reducing valve, wherein, the spring cavity of the pressure-reducing valve connects with the oil inlet of the pressure-reducing valve, the pressure-reducing valve
Connected without spring cavity with the oil-out of the filter.
One preferably or in alternative embodiment, the safety valve includes valve body of safety valve, and the valve body of safety valve is interior from peace
The oil inlet of full valve is to being arranged in parallel overflow valve and check valve, the oil inlet connection institute of the overflow valve on the oil circuit of oil-out
The oil inlet of safety valve is stated, the oil-out of the overflow valve connects the oil-out of the safety valve, the oil inlet of the check valve
The oil-out of the safety valve is connected, the oil-out of the check valve connects the oil inlet of the safety valve.
One preferably or in alternative embodiment, axially disposed in the oil-feed connection valve body to have main valve hole, the middle position is unloaded
The valve element of lotus valve is located in the main valve hole of the oil-feed connection valve body, valve element and the oil-feed connection valve body of the middle position unloading valve
Main valve hole between form multiple oil pockets, wherein, two oil pockets respectively correspond to by the oil-feed connection valve body interior oil
Road connects the oil inlet and oil return opening of the oil-feed connection valve body.
One preferably or in alternative embodiment, the signal amplifying valve, safety valve and pressure compensation choke valve are screw thread
Plug-in structure, one end are plugged in the oil-feed connection valve body, and the other end is provided with screw plug.
One preferably or in alternative embodiment, the signal amplifying valve includes signal amplifying valve valve pocket, the signal amplification
Valve opening is provided with valve valve pocket, is provided with valve element in the valve opening, one end of the valve element is provided with spring, the valve element it is another
One end is provided with screw plug, annular chamber is formed between the valve element and the valve opening, the annular chamber is by being arranged on the signal
Two internal oil passages on amplifying valve valve pocket correspond to respectively to be connected with the oil inlet of the signal amplifying valve and load-sensitive port,
The annular chamber also passes through the axial oil communication set in damping hole and the valve element, the interior axial oil circuit set of the valve element
Positioned at close to the side of the screw plug；It is additionally provided with the signal amplifying valve valve pocket for connecting the valve opening where the spring
Chamber and the oil circuit of the load pressure port.
One preferably or in alternative embodiment, the signal amplifying valve includes signal amplifying valve valve pocket, the signal amplification
Valve opening is provided with valve valve pocket, is provided with valve element in the valve opening, one end of the valve element is provided with spring, the valve element it is another
One end is provided with screw plug, and two annular chambers are formed between the valve element and the valve opening, and two annular chambers pass through setting
Internal oil passages on the signal amplifying valve valve pocket correspond to and the load-sensitive port of the signal amplifying valve and oil-feed respectively
Mouth connection；Wherein, the annular chamber connected with the load-sensitive port of the signal amplifying valve is also by being arranged on the valve
The axial oil circuit of valve core inside described in radial direction oil communication on core, the ring connected with the oil inlet of the signal amplifying valve
Shape chamber also connects the axial oil circuit of the valve core inside, the axle of the valve core inside by the damping hole being arranged on the valve element
The side of the screw plug is positioned close to oil circuit, is additionally provided with the signal amplifying valve valve pocket for connecting the spring institute
Valve opening chamber and the load pressure port oil circuit.
To achieve the above object, present invention also offers a kind of load sensitive system, it is included in any of the above-described embodiment
Load sensing multi-way valve.
To achieve the above object, present invention also offers a kind of excavator, it includes the load in any of the above-described embodiment
Sensory system.
Based on above-mentioned technical proposal, the present invention at least has the advantages that：
Signal amplifying valve provided by the invention is amplified conversion to load pressure by the amplification spring in it, and then
The recuperation valve of control load sensitive pump is removed, is solved in load sensitive system because of the maximum load Stress control for feeding back to hydraulic pump
The problem of system energy loss caused by signal attenuation increases.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the hydraulic principle schematic diagram that the oil-feed of load sensing multi-way valve provided by the invention joins；
Fig. 2 and Fig. 3 is that the oil-feed of load sensing multi-way valve provided by the invention is associated in the schematic cross-sectional view of different angle；
Fig. 4 is the cross section structure diagram of the first embodiment of signal amplifying valve provided by the invention；
Fig. 5 is the cross section structure diagram of the second embodiment of signal amplifying valve provided by the invention；
Fig. 6 is the hydraulic principle schematic diagram of load sensitive system provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is clearly and completely retouched
State.Obviously, described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments.Based on this hair
Bright embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
As shown in fig. 6, it is the illustrative examples of load sensing multi-way valve provided by the invention, in the illustrative examples
In, load sensing multi-way valve includes oil-feed connection 100 and work connection 20.
As shown in figure 1, oil-feed connection 100 includes oil-feed connection valve body 1, signal amplifying valve 8 is provided with oil-feed connection valve body 1.
Signal amplifying valve 8 oil inlet connection oil-feed connection valve body 1 on oil inlet 32, the oil inlet of signal amplifying valve 8 with
The second damping 6 is provided with the oil circuit 56 that oil inlet 32 on oil-feed connection valve body 1 connects.
Load pressure port (Lc) 34 on the spring side control chamber connection oil-feed connection valve body 1 of signal amplifying valve 8, oil-feed connection
Load pressure port 34 on valve body 1 connects the load pressure oil circuit in work connection 20, the spring side control chamber of signal amplifying valve 8
The 3rd damping 11 is provided with the oil circuit connected with the load pressure port 34 on oil-feed connection valve body 1.
The load joined without spring control chamber and oil-feed on valve body 1 of the oil-out communications signals amplifying valve 8 of signal amplifying valve 8
Sensitive ports (Ls) 35, the load-sensitive port 35 that oil-feed joins on valve body 1 connect the load-sensitive oil circuit in work connection 20；Signal
The oil-out of amplifying valve 8 is with being provided with the 4th damping 7 on the oil circuit connected without spring control chamber of signal amplifying valve 8.
The oil inlet 32 of oil-feed connection valve body 1 also connects the pressure oil port 36 on oil-feed connection valve body 1, oil-feed by oil circuit 72
Join the pressure oil port 36 of valve body 1 and the pressure oil communication in work connection 20, pressure oil is provided for system.
The port 33 being connected with the oil return circuit on work connection 20 is additionally provided with oil-feed connection valve body 1.Port 33 passes through oil
The oil return opening 31 of road connection oil-feed connection valve body 1 and the oil-out of middle position unloading valve 2.
The present invention is provided with signal amplifying valve 8 in oil-feed connection valve body 1, and signal amplifying valve 8 can will come from work connection 20
Load pressure control signal amplification after by oil-feed join valve body 1 on load-sensitive port 35 export；Signal amplifying valve 8 by
Amplification spring in it, conversion is amplified to load pressure, and then goes to control the recuperation valve of load sensitive pump, solves load
The problem of pressure controling signal is decayed；And signal amplifying valve 8 can depressurize to inlet pressure.
In the illustrative examples of load sensing multi-way valve provided by the invention, it can also be set in oil-feed connection valve body 1
Have a middle position unloading valve 2, the oil inlet 32 of the oil inlet connection oil-feed connection valve body 1 of middle position unloading valve 2, middle position unloading valve 2 it is fuel-displaced
The oil return opening 31 of mouth connection oil-feed connection valve body 1, the oil-out of the spring cavity communications signals amplifying valve 8 of middle position unloading valve 2 and load
Sensitive ports 35, and it is provided with the first resistance on the oil circuit of the oil-out of the spring cavity communications signals amplifying valve 8 of middle position unloading valve 2
Buddhist nun 5；The oil inlet of middle position unloading valve 2 connects with middle position unloading valve 2 without spring cavity, and middle position unloading valve 2 oil inlet with
The 5th damping 3 is provided with the oil circuit without spring cavity connection of middle position unloading valve 2；Under working condition, middle position unloading valve 2 is closed,
Flow is provided for working oil path.
The present invention is able to maintain that system low-voltage power larger flow, responsive to load banked direction control valves by setting middle position unloading valve 2
It is rinsed, plays radiating and carry pollutant.
In the illustrative examples of load sensing multi-way valve provided by the invention, it can also be set in oil-feed connection valve body 1
There is pressure compensation choke valve 10, the oil inlet connection oil-feed of pressure compensation choke valve 10 joins the load pressure port 34 on valve body 1,
Oil return opening on the oil-out connection oil-feed connection valve body 1 of pressure compensation choke valve 10.The present invention passes through pressure compensation choke valve 10
Load pressure control signal is filtered.
Further, pressure compensation choke valve 10 can include pressure compensation throttling valve body, pressure compensation choke valve valve
It is sequentially connected in series in vivo on the oil circuit the oil-out from the oil inlet of pressure compensation choke valve 10 to pressure compensation choke valve 10
Filter, the 6th damping 9 and pressure-reducing valve are provided with, wherein, the spring cavity of pressure-reducing valve connects with the oil inlet of pressure-reducing valve, pressure-reducing valve
Connected without spring cavity with the oil-out of filter.
The present invention can play filter action to control pressure by setting pressure compensation choke valve 10, eliminate load pressure
Pressure oscillation caused by power change, make flow system flow stable.
In the illustrative examples of load sensing multi-way valve provided by the invention, it can also be set in oil-feed connection valve body 1
There is safety valve 4, the oil inlet of safety valve 4 connects the oil inlet 32 of oil-feed connection valve body 1, the oil-out of safety valve 4 by oil circuit 71
Connect the oil-out of middle position unloading valve 2 and the oil return opening 31 of oil-feed connection valve body 1；When there is high pressure in system exception situation, safety
Valve 4 plays a part of protection system.
Further, safety valve 4 can include valve body of safety valve, and valve body of safety valve is interior from the oil inlet of safety valve 4 to peace
Overflow valve and check valve have been arranged in parallel on oil circuit between the oil-out of full valve 4, the oil inlet connection safety valve 4 of overflow valve
Oil inlet, the oil-out of the oil-out connection safety valve 4 of overflow valve, the oil-out of the oil inlet connection safety valve 4 of check valve are single
The oil inlet of safety valve 4 is connected to the oil-out of valve.
An as shown in Fig. 2 specific embodiment of the oil-feed connection for load sensing multi-way valve provided by the invention.
In this specific embodiment, oil-feed, which joins, includes oil-feed connection valve body 1, axially disposed in oil-feed connection valve body 1 to have main valve
Hole, the valve element 21 of middle position unloading valve 2 are located in the main valve hole of oil-feed connection valve body 1, and valve element 21 and the oil-feed of middle position unloading valve 2 join
Multiple oil pockets are formed between the main valve hole of valve body 1, wherein, two oil pockets correspond to the internal oil passages for joining valve body 1 by oil-feed respectively
Connect the oil inlet 32 and oil return opening 31 of oil-feed connection valve body 1.
As shown in Figure 2 and Figure 3, signal amplifying valve 8, safety valve 4 and pressure compensation choke valve 10 are screw thread inserting type knot
Structure, one end are plugged in oil-feed connection valve body 1, and the other end is provided with screw plug.
Signal amplifying valve 8 provided by the invention can use arch throttle-type signal amplifying valve or single orifice restriction type to believe
Number amplifying valve, the concrete structure of signal amplifying valve 8 is described in detail with reference to Fig. 4 and Fig. 5.
As shown in figure 4, signal amplifying valve 8 is arch throttle-type signal amplifying valve：Signal amplifying valve 8 includes signal amplifying valve
Valve pocket 82, valve opening is provided with signal amplifying valve valve pocket 82, valve element 83 is provided with valve opening, one end of valve element 83 is provided with amplification
Spring 84, the other end of valve element 83 are provided with screw plug 85, annular chamber 81 are formed between valve element 83 and valve opening, annular chamber 81 is by setting
Put two internal oil passages on signal amplifying valve valve pocket 82 and correspond to oil inlet P and load-sensitive with signal amplifying valve 8 respectively
Port Ls is connected, and annular chamber 81 also passes through the axial oil communication set in damping hole 7 and valve element 83, the interior axle set of valve element 83
It is located to oil circuit close to one end of screw plug 85；It is additionally provided with signal amplifying valve valve pocket 82 for connecting the place of amplification spring 84
The oil circuit of valve opening chamber and load pressure port Lc.
In arch throttle-type signal amplifying valve, P mouths are the oil inlet of signal amplifying valve 8, and Ls is that load-sensitive feedback is logical
Road, Lc are load pressure feedback passage, when P mouth oil-feeds, are depressurized by arch restriction, due to amplifying the work of spring 84
With being amplified to load pressure control signal Lc and act on middle position off-load for Ls pressure controling signals, Ls pressure controling signals
The spring cavity and load sensitive system hydraulic pump compensator of valve 2；By adjusting screw plug 85, can to obtain amplification spring 84 different
Signal value of magnification.
As shown in figure 5, signal amplifying valve 8 is single orifice restriction type signal amplifying valve：Signal amplifying valve 8 is put including signal
Big valve valve pocket 82, valve opening is provided with signal amplifying valve valve pocket 82, valve element 831 is provided with valve opening, one end of valve element 831 is set
There is amplification spring 84, the other end of valve element 831 is provided with screw plug 85, two annular chambers of formation between valve element 831 and valve opening, two
Annular chamber is by being arranged on the corresponding load-sensitive with signal amplifying valve respectively of the internal oil passages on signal amplifying valve valve pocket 82
Port Ls connects with oil inlet P；Wherein, setting is also passed through with the load-sensitive port Ls of signal amplifying valve 8 annular chambers connected
The axial oil circuit of radial direction oil communication valve core inside on valve element, the annular chamber connected with the oil inlet P of signal amplifying valve 8 is also
By the axial oil circuit for the connection valve core inside of damping hole 7 being arranged on valve element, the axial oil circuit in valve element is positioned close to spiral shell
85 side is blocked up, valve opening chamber and load pressure for connecting the place of amplification spring 84 are additionally provided with signal amplifying valve valve pocket 82
Port Lc oil circuit.
Single orifice restriction type signal amplifying valve is similar with the structural principle of arch throttle-type signal amplifying valve, single aperture
Throttle-type signal amplifying valve is mainly depressurized using valve element orifice restriction.
As Figure 1-3, the oil circuit of a specific embodiment of the oil-feed connection of load sensing multi-way valve provided by the invention connects
Connect as follows：
The oil inlet 32 of pressure oil from oil-feed connection valve body 1 enters in oil-feed connection valve body 1,
The oil return opening 31 of oil-feed connection valve body 1 is connected to by middle position unloading valve 2 all the way, when operating mechanism does not work, is
System Low-pressure load discharge, plays energy-conserving action；
The oil return opening 31 of oil-feed connection valve body 1 is connected to by oil circuit 71, safety valve 4, oil circuit 23, oil circuit 24 all the way, is being
When high pressure occur in system abnormal conditions, shield；
The pressure oil port 36 and the pressure oil passage in work connection valve body 20 for joining valve body 1 through oil circuit 72, oil-feed all the way connect
It is logical, when operating mechanism works, pressure oil is provided for system；
The damping of oil circuit 56, second 6 and signal amplifying valve 8 produce Stress control on valve rod of the another way through middle position unloading valve 2
Signal Ls, through the load-sensitive port 35 on oil-feed connection valve body 1 and the Ls oil communications in work connection valve body 20.
Lc passage of the Lc load pressures control signal from work connection 20, the load pressure port of valve body 1 is joined by oil-feed
34 enter oil-feed connection Lc oil pockets,
The valve element 83 and amplification spring of signal amplifying valve 8 are acted on through the damping hole 11 on signal amplifying valve valve pocket 82 all the way
The left side of 84 connections, the right side of valve element 83 connect with Ls control signals, and Ls pressure is Lc load pressures and the amplification spring force of spring 84
Sum, so as to which load control signal Lc is amplified into Ls；
Another way through oil circuit 12, pressure compensation choke valve 10 valve element 101 on damping hole 9, oil circuit 14, oil circuit 15 and oil return
Chamber T-phase leads to (as shown in Figure 3), and pressure compensation choke valve 10 strobes to load control signal Lc, and then Ls is controlled and believed
Number rise stabilization.
Ls control pressures are connected by the first damping 5 with the spring cavity of middle position unloading valve 2 all the way, make to close under working condition
Middle position unloading valve 2, flow is provided for working oil path；Another way acts on load sensitive system hydraulic pump by external connection pipeline
Hydraulic pump flow is adjusted compensator, and regime flow is provided according to pressure flow demand.
Load sensing multi-way valve provided by the invention can be applied in load sensitive system.
In the illustrative examples of load sensitive system provided by the invention, load sensitive system can include above-mentioned
Load sensing multi-way valve in one embodiment.
Load sensitive system provided by the invention can be applied on board a dredger.
In the illustrative examples of excavator provided by the invention, excavator includes above-mentioned load sensitive system.
As shown in fig. 6, the load sensitive system for load sensing multi-way valve of the present invention with signal amplification is dug in hydraulic pressure
A concrete application example on pick machine.
Hydraulic jack 50 controls the lifting and decline of big arm of digger, and rotary motor 51 controls the revolution that excavator is got on the bus,
Its specific implementation process is：
The inlet port of hydraulic pump 40 is connected by inlet line 62 with hydraulic oil container 41, and oil-out is by pressure duct 63 with bearing
The oil inlet 32 for carrying sensing multi-way valve oil-feed connection is connected, and the oil return opening 31 of oil-feed connection is connected by pipeline 61 with hydraulic oil container 41,
The port 91 of tail connection 90 is connected by pipeline 52 with hydraulic pump compensator.The big chamber 501 of oil cylinder of big arm of digger and work connection port
201 connections, small chamber 502 are connected with work connection port 202.
When big arm of digger is lifted, work 20 main reversing valves 43 of connection are in upper work, and hydraulic pump 40 passes through fuel sucking pipe
Road 62 joins port 32 through oil-feed by pressure duct 63 and enters oil-feed connection valve body 1 from the oil suction of hydraulic oil container 41, the hydraulic oil of discharge,
Through the restriction 431 of main reversing valve 43 on oil-feed connection valve body pressure runner 72, work connection 20, recuperation valve 44, main reversing valve 43
Commutation passage 432, work connection working port 201 enter the big chamber 501 of big arm cylinder 50；Low pressure oil is from the small chamber of big arm cylinder simultaneously
502 outflows, port 31, low is joined by the connection port 501 that works, the commutation passage 432 of main reversing valve 43, drainback passage 60, oil-feed
Hydraulic oil container 41 is flowed back on pressure pipe road 61.
Meanwhile large arm load pressure control signal Lc takes out after recuperation valve 44, pass through control passage 53, oil-feed joint control system
Passage 58, damping hole 11 act on the spring cavity of signal amplifying valve 8, and according to the balanced action of power, pump intake pressure joins 100 through oil-feed
Control signal Ls, which is produced, after upper second damping 6 and signal amplifying valve 8 amplifies valve spring force sum for load control pressure and signal,
So as to realize load control pressure Lc amplification, hydraulic pump compensator is arrived in the port 91 for compensating banked direction control valves inner flow passage and tail connection 90
The pressure loss of longer control piper 52 between 42, make to act on the control signal Ls of hydraulic pump compensator close to real load pressure
Power.
The spring of pressure compensator 42 setting of hydraulic pump and pressure difference and pump before and after the restriction 431 of work connection main reversing valve 43
Mouth pressure and the difference of load pressure match, in the case where choke area and design pressure difference determine, flow system flow and liquid
Press pump compensator spring setting value is relevant, and the setting pressure difference of prexxure of the hydraulic pump compensator should set pressure difference with restriction in theory
It is equal, consider the pressure loss of actual Ls transfer conduits, the pressure differential resetting of prexxure of the hydraulic pump compensator is slightly above restriction pressure difference.
Due to amplification of the signal amplifying valve 8 to load signal Lc, hydraulic pump compensator spring setting value, which was not required to higher position, to be made
System obtains regime flow, reaches the purpose of energy-conservation.Pressure compensation choke valve 9 strobes to load control signal Lc, puts down
Steady Lc load control signals and Ls control signals, reduce the pulsation of hydraulic pressure pump output flow.There are abnormal conditions and led in work system
When causing high pressure, safety valve 4 opens release, and system is shielded.
When operating mechanism does not work, the pressure oil of hydraulic pump 40 is returned to by middle position unloading valve 2, the low pressure of return line 61
Hydraulic oil container 41, system is maintained a low pressure 20L or so flow, on the one hand hydraulic valve is rinsed, play radiating and band
Pollutant effect is walked, on the other hand when operating mechanism acts, hydraulic pump quickly responds.
In load sensitive system provided by the invention, with signal amplification load sensing multi-way valve oil-feed UNICOM cross into
The upper signal amplifying valve of oil connection is amplified to load control signal, is compensated caused by banked direction control valves internal oil passages and external pipeline
The pressure loss, then solved as hydraulic pump control signal function in hydraulic pump compensator in load sensitive system because of feedback
The problem of increasing to system energy loss caused by the maximum load pressure controling signal decay of hydraulic pump；Meanwhile be installed on into
Pressure compensation choke valve on oil connection load pressure control oil circuit plays filter action to control pressure, effectively eliminates load pressure
Pressure oscillation caused by change, hydraulic pump is set to provide stable flow for system.
Finally it should be noted that:The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
The embodiment of the present invention can be modified or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical scheme, it all should cover among the claimed technical scheme scope of the present invention.
Claims (13)
1. a kind of load sensing multi-way valve, including oil-feed connection and work connection, it is characterised in that：The oil-feed connection includes oil-feed connection valve
Body, the oil-feed, which joins, is provided with signal amplifying valve in valve body, and the oil inlet of the signal amplifying valve connects the oil-feed connection valve body
On oil inlet, the spring side control chamber of the signal amplifying valve connects the load pressure port on the oil-feed connection valve body, institute
State the load pressure oil circuit that the load pressure port on oil-feed connection valve body connects work connection, the signal amplifying valve it is fuel-displaced
Mouth connects joining without the load-sensitive port in spring control chamber and oil-feed connection valve body, the oil-feed for the signal amplifying valve
Load-sensitive port on valve body connects the load-sensitive oil circuit of the work connection；Load pressure control from work connection
The load-sensitive port that signal is joined after signal amplifying valve amplification by the oil-feed on valve body exports；The oil-feed connection
The oil inlet of valve body also connects the pressure oil port of oil-feed connection valve body, the pressure oil port of the oil-feed connection valve body with it is described
Worked the pressure oil communication joined, and pressure oil is provided for system.
2. load sensing multi-way valve as claimed in claim 1, it is characterised in that：The oil inlet of the signal amplifying valve with it is described
The second damping is provided with the oil circuit of oil inlet connection on oil-feed connection valve body；The spring side control chamber of the signal amplifying valve with
The 3rd damping is provided with the oil circuit of load pressure port connection on the oil-feed connection valve body；The signal amplifying valve it is fuel-displaced
Mouth is with being provided with the 4th damping on the oil circuit connected without spring control chamber of the signal amplifying valve.
3. load sensing multi-way valve as claimed in claim 1, it is characterised in that：Middle position is additionally provided with the oil-feed connection valve body
Unloading valve, the oil inlet of the middle position unloading valve connect the oil inlet of the oil-feed connection valve body, the middle position unloading valve it is fuel-displaced
Mouth connects the oil return opening of the oil-feed connection valve body, and the spring cavity of the middle position unloading valve connects the oil-out of the signal amplifying valve
With the load-sensitive port；The oil inlet of the middle position unloading valve connects with the middle position unloading valve without spring cavity, and
The oil inlet of middle position unloading valve is with being provided with the 5th damping on the oil circuit connected without spring cavity of the middle position unloading valve；Work shape
Under state, the middle position unloading valve is closed, flow is provided for working oil path.
4. load sensing multi-way valve as claimed in claim 3, it is characterised in that：Pressure is additionally provided with the oil-feed connection valve body
Choke valve is compensated, the oil inlet of the pressure compensation choke valve connects the load pressure port on the oil-feed connection valve body, described
The oil-out of pressure compensation choke valve connects the oil return opening on the oil-feed connection valve body；By the pressure compensation choke valve to negative
Pressure controling signal is carried to be filtered.
5. load sensing multi-way valve as claimed in claim 4, it is characterised in that：Safety is additionally provided with the oil-feed connection valve body
Valve, the oil inlet of the safety valve connect the oil inlet of the oil-feed connection valve body, during the oil-out connection of the safety valve is described
The oil-out of position unloading valve and the oil return opening of oil-feed connection valve body；When there is high pressure in system exception situation, the safety valve
Play a part of protection system.
6. load sensing multi-way valve as claimed in claim 4, it is characterised in that：The pressure compensation choke valve is mended including pressure
Repay throttling valve body, on the oil circuit in pressure compensation throttling valve body from the oil inlet of pressure compensation choke valve to oil-out successively
Filter, the 6th damping and pressure-reducing valve have been arranged in series, wherein, the oil inlet of the spring cavity of the pressure-reducing valve and the pressure-reducing valve
Connection, the pressure-reducing valve connect without spring cavity with the oil-out of the filter.
7. load sensing multi-way valve as claimed in claim 5, it is characterised in that：The safety valve includes valve body of safety valve, institute
State and overflow valve and check valve have been arranged in parallel on the oil circuit in valve body of safety valve from the oil inlet of safety valve to oil-out, it is described to overflow
The oil inlet for flowing valve connects the oil inlet of the safety valve, and the oil-out of the overflow valve connects the oil-out of the safety valve,
The oil inlet of the check valve connects the oil-out of the safety valve, and the oil-out of the check valve connects entering for the safety valve
Hydraulic fluid port.
8. load sensing multi-way valve as claimed in claim 5, it is characterised in that：It is axially disposed in the oil-feed connection valve body to have
Main valve hole, the valve element of the middle position unloading valve are located in the main valve hole of the oil-feed connection valve body, the valve of the middle position unloading valve
Multiple oil pockets are formed between the main valve hole of core and oil-feed connection valve body, wherein, two oil pockets correspond to by described respectively
The internal oil passages of oil-feed connection valve body connect the oil inlet and oil return opening of the oil-feed connection valve body.
9. load sensing multi-way valve as claimed in claim 8, it is characterised in that：Signal amplifying valve, safety valve and the pressure
Compensation choke valve is screw thread inserting type structure, and one end is plugged in the oil-feed connection valve body, and the other end is provided with screw plug.
10. load sensing multi-way valve as claimed in claim 1, it is characterised in that：The signal amplifying valve amplifies including signal
Valve valve pocket, valve opening being provided with the signal amplifying valve valve pocket, valve element being provided with the valve opening, one end of the valve element is set
There is spring, the other end of the valve element is provided with screw plug, annular chamber, the annular chamber are formed between the valve element and the valve opening
Correspond to the oil inlet with the signal amplifying valve respectively by two internal oil passages being arranged on the signal amplifying valve valve pocket
Connected with load-sensitive port, the annular chamber is described also by the axial oil communication set in damping hole and the valve element
The axial oil circuit set in valve element is located at close to the side of the screw plug；It is additionally provided with the signal amplifying valve valve pocket for connecting
The oil circuit of valve opening chamber and the load pressure port where the logical spring.
11. load sensing multi-way valve as claimed in claim 1, it is characterised in that：The signal amplifying valve amplifies including signal
Valve valve pocket, valve opening being provided with the signal amplifying valve valve pocket, valve element being provided with the valve opening, one end of the valve element is set
There is spring, the other end of the valve element is provided with screw plug, and two annular chambers, two institutes are formed between the valve element and the valve opening
Annular chamber is stated to correspond to respectively and the signal amplifying valve by being arranged on the internal oil passages on the signal amplifying valve valve pocket
Load-sensitive port connects with oil inlet；Wherein, the annular chamber connected with the load-sensitive port of the signal amplifying valve
Also by the axial oil circuit of valve core inside described in the radial direction oil communication that is arranged on the valve element, with the signal amplifying valve
The annular chamber of oil inlet connection also connects the axial oil of the valve core inside by the damping hole being arranged on the valve element
Road, the axial oil circuit of the valve core inside are positioned close to the side of the screw plug, also set up on the signal amplifying valve valve pocket
Have for connecting the valve opening chamber where the spring and the oil circuit of the load pressure port.
A kind of 12. load sensitive system, it is characterised in that：Including the load-sensitive multichannel as described in claim any one of 1-11
Valve.
A kind of 13. excavator, it is characterised in that：Including load sensitive system as claimed in claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410554873.7A CN105570491B (en) | 2014-10-17 | 2014-10-17 | Load sensing multi-way valve, load sensitive system and excavator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410554873.7A CN105570491B (en) | 2014-10-17 | 2014-10-17 | Load sensing multi-way valve, load sensitive system and excavator |
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| CN105570491A CN105570491A (en) | 2016-05-11 |
| CN105570491B true CN105570491B (en) | 2018-03-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107725523B (en) * | 2017-11-14 | 2023-12-15 | 江苏恒立液压科技有限公司 | Load-sensitive multiway valve and engineering machinery with same |
| CN109326925B (en) * | 2018-10-30 | 2020-06-23 | 中国船舶工业***工程研究院 | Pressure self-adaptation compensation underwater joint |
| CN110285100B (en) * | 2019-06-28 | 2024-07-09 | 三一重机有限公司 | Damping hydraulic system and engineering machinery |
| CN111022408B (en) * | 2020-01-06 | 2021-11-12 | 合肥工业大学 | Combination valve with return oil way compensation load sensing function |
| CN111577689B (en) * | 2020-06-03 | 2021-03-26 | 江苏科迈液压控制***有限公司 | Flow saturation resisting method for load sensitive proportional multi-way valve |
| CN113104712B (en) * | 2021-03-18 | 2022-09-13 | 中铁五局集团第一工程有限责任公司 | Inclined shaft safety lifting system |
| CN113898763B (en) * | 2021-11-02 | 2024-07-23 | 吴俊� | Integrated bottle valve with pressure reducing and flow controlling functions |
| 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 |
| CN114396416B (en) * | 2022-01-07 | 2022-10-25 | 燕山大学 | Parameter sensitivity analysis method for pressure compensation system behind valve |
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| CN105570491A (en) | 2016-05-11 |
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