CN207598615U - A kind of electro-hydraulic leveling valve group of multifunctional working bucket - Google Patents
A kind of electro-hydraulic leveling valve group of multifunctional working bucket Download PDFInfo
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- CN207598615U CN207598615U CN201721312443.XU CN201721312443U CN207598615U CN 207598615 U CN207598615 U CN 207598615U CN 201721312443 U CN201721312443 U CN 201721312443U CN 207598615 U CN207598615 U CN 207598615U
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Abstract
The utility model discloses a kind of electro-hydraulic leveling valve groups of multifunctional working bucket, the electro-hydraulic leveling valve group of working bucket is respectively communicated with V1 ends and V2 ends, the V1 ends of the second balanced valve and V2 ends of the first balanced valve, the C1 ends of first balanced valve connect leveling cyclinder two-port with C2 ends, and the C1 ends of the second balanced valve connect oscillating oil cylinder two-port with C2 ends.Load self compensation two-bit triplet electronic proportioning valve is done directly the compensation control of pressure load sensitivity, two two-bit triplet electronic proportioning valve combination control leveling cyclinder directions and speed, the two small high-resolution precise control of flew of flow of the spool metered flow unsymmetrical arrangement leveling cyclinder easy to implement to asymmetric compression area；Off-load electronic proportioning valve closes control working bucket with unidirectional meter out valve group and swings rotating speed, realizes small flow fine motion control, it is adjustable to work at the same time bucket swing speed ratio；The compression shock that the unidirectional return valve isolation quick emergency unloading of off-load electronic proportioning valve is brought.
Description
Technical field
The utility model is related to a kind of electro-hydraulic leveling valve groups of multifunctional working bucket, belong to technical field of hydraulic pressure, suitable for work
Make bucket lifting arm support class engineering machinery, be particularly suitable for high-altitude operation vehicle.
Background technology
High-altitude operation vehicle lifts apparatus for work as typical working bucket, and working bucket leveling system is safe and reliable, quick steady
Surely it is its core demand.At present, typical working bucket leveling system is divided into mechanical leveling, hydrostatic leveling and electrichydraulic control leveling
Three kinds.
Generally using the leveling of pull rod machinery or link chain mechanism leveling, mechanical leveling structure is complicated, is chiefly used in for mechanical leveling
Fold arm class high-altitude operation vehicle.Mechanical levelling gear weight is larger so as to reduce the operation amplitude range for elevating arm support.
Hydrostatic leveling is controlled using double hydraulic cylinder isometric(al) hydrostatic drive, is chiefly used in below 28m telescopic arms class or folding
The folded hybrid arm body high-altitude operation vehicle that stretches, hydraulic oil compressibility and hose elasticity are limited between by double hydraulic cylinder, work as pipe
Road length is difficult to meet standard requirement of the working bucket level inclination less than 5 ° in the lifting process of arm support when being more than critical value.
Patent CN200820087199 employs two groups of isometric(al) double hydraulic cylinders to complete the working bucket tune of higher lift arm
It is flat.The influence of duct length and fold mechanism feature is limited to, upper telescopic oil cylinder is mechanically connected using lower telescopic oil cylinder group pull rod
Prescription case, structure is sufficiently complex, and manufacture economy is poor.
The third is electrichydraulic control leveling, is generally installed using working bucket obliquity sensor signal control standard industrial tray
Electromagnetic switch reversal valve or electrical proportional reversal valve driving leveling cyclinder leveling working bucket, are chiefly used in rice number working at height turner
Make bucket leveling.
Using the scheme of electromagnetic switch reversal valve driving leveling cyclinder, by electromagnetic switch commutation compression shock and oil stream amount is crossed
It the influence of factors such as can not accurately control, working bucket leveling inclination deviation is larger, stability and safety are poor；
Patent CN201210483347 drives the scheme of leveling cyclinder using speed control valves series proportioning valve.Its feature：It is told
The hydraulic fluid flow rate of leveling cyclinder is controlled by speed governing valve and leveling proportioning valve dual tandem.By speed governing valve and receive controller letter
Number electronic proportioning valve co- controlling leveling cyclinder stretch and lean forward or hypsokinesis to complete working bucket, so as to complete working bucket leveling control
System.
The program has the following disadvantages：Speed governing valve flow pressure control response needs the time and caused by valve core movement vibrates
Compression shock, working bucket leveling inclination angle, which is easily transfinited, when causing the arm support to start stops in emergency, and reduces the fast of leveling cyclinder response
Speed and stability, so as to influence the safety and reliability of working bucket operation；
Leveling valve group be working bucket leveling control core element, principle directly determine leveling system accuracy,
Rapidity, stability, the integrated and protecting against shock ability of functional diversities.How to realize that the safe and reliable ratio of leveling cyclinder is stretched
Contracting, it is that those skilled in the art need the technology solved to ask that cost is reduced to electric control signal quick response and multifunctional unit
Topic.
Utility model content
Technical problem to be solved in the utility model is the defects of overcoming the prior art, provides a kind of multifunctional working bucket
Electro-hydraulic leveling valve group.
In order to achieve the above objectives, the utility model provides a kind of electro-hydraulic leveling valve group of multifunctional working bucket, including leveling oil
Cylinder and oscillating oil cylinder, further include balanced valve and the electro-hydraulic leveling valve group of working bucket, and the balanced valve includes the first balanced valve and second
Balanced valve, the electro-hydraulic leveling valve group of working bucket be respectively communicated with the V1 ends of first balanced valve, first balanced valve V2
The V2 ends at end, the V1 ends of second balanced valve and second balanced valve, the C1 ends of first balanced valve, the first balanced valve
C2 ends be respectively communicated with the leveling cyclinder two-port, the C1 ends of second balanced valve, second balanced valve C2 ends point
The oscillating oil cylinder two-port is not connected.
Preferentially, it is electro-hydraulic to include the electro-hydraulic leveling valve group oil inlet P of working bucket, working bucket for the electro-hydraulic leveling valve group of the working bucket
Leveling valve group oil return inlet T, unidirectional return valve, oscillating oil cylinder proportionality velocity modulation stablize rotation control mechanism and leveling cyclinder proportionality velocity modulation
Stablize pushing handle telescopic control mechanism, the leveling cyclinder proportionality velocity modulation stablizes pushing handle telescopic control mechanism and is respectively communicated with first balanced valve
V1 ends, the V2 ends of first balanced valve, the oscillating oil cylinder proportionality velocity modulation stablize rotation control mechanism and are respectively communicated with described the
The V1 ends of two balanced valves and the V2 ends of second balanced valve, the oscillating oil cylinder proportionality velocity modulation stablize rotation control mechanism, institute
It states leveling cyclinder proportionality velocity modulation stabilization pushing handle telescopic control mechanism and respectively connects the electro-hydraulic leveling valve group oil inlet P of the working bucket, institute
It states unidirectional return valve oil inlet and is respectively communicated with the oscillating oil cylinder proportionality velocity modulation stabilization rotation control mechanism and the leveling cyclinder
Proportionality velocity modulation stablizes pushing handle telescopic control mechanism, and the unidirectional return valve oil outlet connects the electro-hydraulic leveling valve group oil return opening of working bucket
T。
Preferentially, the leveling cyclinder proportionality velocity modulation stablizes pushing handle telescopic control mechanism and includes rodless cavity electronic proportioning valve and have bar
Chamber electronic proportioning valve, the rodless cavity electronic proportioning valve oil inlet connect the rod chamber electronic proportioning valve oil inlet, the work
The electro-hydraulic leveling valve group oil inlet P of making to struggle against connect the rodless cavity electronic proportioning valve oil inlet, the rod chamber electronic proportioning valve into
Node a between hydraulic fluid port, the rodless cavity electronic proportioning valve actuator port connects the V1 ends of first balanced valve, described to have bar
Chamber electronic proportioning valve actuator port connects the V2 ends of first balanced valve, the rodless cavity electronic proportioning valve oil return opening, described
Rod chamber electronic proportioning valve oil return opening connects the unidirectional return valve oil inlet.
Preferentially, the oscillating oil cylinder proportionality velocity modulation stablizes rotation control mechanism and includes electromagnetic switch reversal valve and unidirectionally return
Oily throttle valve, the unidirectional meter out valve include the first unidirectional meter out valve and the second unidirectional meter out valve, the electricity
Magnetic switch reversal valve oil inlet connects the node a, and the first actuator port of electromagnetic switch reversal valve connection described first is single
To meter out valve oil inlet, second actuator port of electromagnetic switch reversal valve connect the second unidirectional meter out valve into
Hydraulic fluid port, the electromagnetic switch reversal valve oil return opening connect the unidirectional return valve oil inlet.
Preferentially, including overflow valve, the overflow valve oil inlet connects the node a, the overflow valve oil outlet connection
The unidirectional return valve oil outlet.
Preferentially, including off-load electronic proportioning valve, the off-load electronic proportioning valve oil inlet connects the node a, described
Off-load electronic proportioning valve oil outlet connects the unidirectional return valve oil outlet.
The advantageous effect that the utility model is reached：
1. load self compensation two-bit triplet electronic proportioning valve is done directly the compensation control of pressure load sensitivity, avoid connecting
The compression shock that the spool dynamic response of two logical pressure-compensated valve initial periods is brought, two two-bit triplet electronic proportioning valve combinations
Control leveling cyclinder direction and speed, the two spool metered flow unsymmetrical arrangement leveling easy to implement to asymmetric compression area
The high-resolution precise control of flew of the small flow of oil cylinder；
2. off-load electronic proportioning valve closes control working bucket with unidirectional meter out valve group and swings rotating speed, small flow fine motion is realized
It is adjustable to work at the same time bucket swing speed ratio for control.
3. off-load electronic proportioning valve is by controlling opening time slope to eliminate long pipe runs high-pressure fluid because flow-passing surface is unexpected
Become larger and be converted to the compression shock that high-velocity fluid is brought, pressure release is more steady during off-load, avoids causing working bucket leveling oil cylinder
The vibration brought by hydraulic shock；
4. the compression shock that the unidirectional return valve isolation quick emergency unloading of off-load electronic proportioning valve is brought.
Description of the drawings
Fig. 1 is the structure chart of the present apparatus.
Mark meaning in attached drawing；The electro-hydraulic leveling valve group of 1- working buckets；11- overflow valves；12- off-load electronic proportioning valves；13- without
Rod cavity electronic proportioning valve；14- rod chamber electronic proportioning valves；15- electromagnetic switch reversal valves；The unidirectional meter out valves of 16-；161-
One unidirectional meter out valve；The second unidirectional meter out valves of 162-；The unidirectional return valves of 17-；2- balanced valves；The first balanced valves of 21-；
The second balanced valves of 22-；3- leveling cyclinders；4- oscillating oil cylinders；The electro-hydraulic leveling valve group oil inlet of P- working buckets, the electro-hydraulic tune of T- working buckets
Flat valve group oil return opening, A1- rodless cavities actuator port, B1- rod chambers actuator port, the first actuator port of A2- oscillating oil cylinders, B2-
The second actuator port of oscillating oil cylinder.
Specific embodiment
The utility model is further described below in conjunction with the accompanying drawings, following embodiment is only used for clearly illustrating this
The technical solution of utility model, and cannot the scope of protection of the utility model be limited with this.
A kind of electro-hydraulic leveling valve group of multifunctional working bucket, including leveling cyclinder 3 and oscillating oil cylinder 4, further includes 2 He of balanced valve
The electro-hydraulic leveling valve group 1 of working bucket, the balanced valve 2 includes the first balanced valve 21 and the second balanced valve 22, the working bucket are electro-hydraulic
Leveling valve group 1 is respectively communicated with the V1 ends of first balanced valve 21, the V2 ends of first balanced valve 21, second balanced valve
22 V1 ends and the V2 ends of second balanced valve 22, the C1 ends of first balanced valve 21, the first balanced valve 21 C2 ends point
Do not connect 3 two-port of leveling cyclinder, the C1 ends of second balanced valve 22, second balanced valve 22 C2 ends connect respectively
Lead to 4 two-port of oscillating oil cylinder.
Further, the electro-hydraulic leveling valve group 1 of the working bucket includes the electro-hydraulic leveling valve group oil inlet P of working bucket, working bucket
Electro-hydraulic leveling valve group oil return inlet T, unidirectional return valve 17, oscillating oil cylinder proportionality velocity modulation stablize rotation control mechanism and leveling cyclinder ratio
Pushing handle telescopic control mechanism is stablized in example speed governing, and it is flat that the leveling cyclinder proportionality velocity modulation stabilization pushing handle telescopic control mechanism is respectively communicated with described first
The V1 ends of weighing apparatus valve 21, the V2 ends of first balanced valve 21, the oscillating oil cylinder proportionality velocity modulation stablize rotation control mechanism difference
The V1 ends of second balanced valve 22 and the V2 ends of second balanced valve 22 are connected, the oscillating oil cylinder proportionality velocity modulation stablizes rotation
Turn control mechanism, the leveling cyclinder proportionality velocity modulation stablizes pushing handle telescopic control mechanism and respectively connects the electro-hydraulic leveling valve of the working bucket
Group oil inlet P, unidirectional 17 oil inlet of return valve are respectively communicated with the oscillating oil cylinder proportionality velocity modulation and stablize rotation control mechanism
Stablize pushing handle telescopic control mechanism with the leveling cyclinder proportionality velocity modulation, unidirectional 17 oil outlet of return valve connects the working bucket electricity
Liquid leveling valve group oil return inlet T.
Further, the leveling cyclinder proportionality velocity modulation stabilization pushing handle telescopic control mechanism includes 13 He of rodless cavity electronic proportioning valve
Rod chamber electronic proportioning valve 14,13 oil inlet of rodless cavity electronic proportioning valve connect 14 oil inlet of rod chamber electronic proportioning valve
Mouthful, the electro-hydraulic leveling valve group oil inlet P of working bucket connects 13 oil inlet of rodless cavity electronic proportioning valve, rod chamber electricity
Node a between sub- 14 oil inlet of proportioning valve, 13 actuator port of rodless cavity electronic proportioning valve connect first balanced valve
21 V1 ends, 14 actuator port of rod chamber electronic proportioning valve connect the V2 ends of first balanced valve 21, the rodless cavity
13 oil return opening of electronic proportioning valve, 14 oil return opening of rod chamber electronic proportioning valve connect 17 oil inlet of unidirectional return valve.
Further, the oscillating oil cylinder proportionality velocity modulation stabilization rotation control mechanism includes electromagnetic switch reversal valve 15 and list
To meter out valve 16, the unidirectional meter out valve 16 includes the first unidirectional 161 and second unidirectional oil return section of meter out valve
Valve 162 is flowed, 15 oil inlet of electromagnetic switch reversal valve connects the node a, and the electromagnetic switch reversal valve 15 first works
Hydraulic fluid port connects first unidirectional 161 oil inlet of meter out valve, 15 second actuator port of the electromagnetic switch reversal valve connection
Second unidirectional 162 oil inlet of meter out valve, 15 oil return opening of electromagnetic switch reversal valve connect the unidirectional return valve
17 oil inlets.
Further, including overflow valve 11,11 oil inlet of overflow valve connects the node a, and the overflow valve 11 goes out
Hydraulic fluid port connects unidirectional 17 oil outlet of return valve.
Further, including off-load electronic proportioning valve 12,12 oil inlet of off-load electronic proportioning valve connects the node
A, 12 oil outlet of off-load electronic proportioning valve connect unidirectional 17 oil outlet of return valve.
Rodless cavity electronic proportioning valve 13 and rod chamber electronic proportioning valve 14 are two-bit triplet electronic proportioning valve.
Overflow valve 11 is located at the electro-hydraulic leveling valve group oil inlet P of multifunctional working bucket and the electro-hydraulic leveling valve group of multifunctional working bucket
Between oil return inlet T, for overload protection, the maximum pressure of the electro-hydraulic leveling valve group of multifunctional working bucket is limited.
Off-load electronic proportioning valve 12 is 2/2-way electronic proportioning valve, is located at the electro-hydraulic leveling valve group oil inlet of multifunctional working bucket
Between mouth P and the electro-hydraulic leveling valve group oil return inlet T of multifunctional working bucket, for the standby off-load of working bucket, emergent stopping off-load and pendulum
Dynamic speed control.Its ratio open function can realize the high-pressure fluid of the electro-hydraulic leveling valve group oil inlet P of multifunctional working bucket in
Slow release or quick release in setting time can set openings of sizes with ratio and unidirectional meter out valve coordinated to realize swing
Oil cylinder swing speed is stepless adjustable.
Rodless cavity electronic proportioning valve 13 is two-bit triplet electronic proportioning valve, oil inlet and the electro-hydraulic leveling of multifunctional working bucket
Valve group oil inlet P is connected, and actuator port is connected with rodless cavity actuator port A1, oil return opening and 17 oil inlet of return check valve
It is connected.When it receives controller control signal, 13 open function of rodless cavity electronic proportioning valve can be controlled from multifunctional working
The electro-hydraulic leveling valve group oil inlet P that struggles against flows into the uninterrupted of rodless cavity actuator port A1, is realized by its own self-compensating function
Unrelated stretching speed control is loaded with leveling cyclinder 3.When its no signal inputs, realize that rodless cavity actuator port A1 fluid connects
17 oil inlet of logical return check valve flows through return check valve 17 and connects the electro-hydraulic leveling valve group oil return inlet T of multifunctional working bucket.
Rod chamber electronic proportioning valve 14 is two-bit triplet electronic proportioning valve, oil inlet and the electro-hydraulic leveling of multifunctional working bucket
Valve group oil inlet P is connected, and actuator port is connected with rod chamber actuator port B1, oil return opening and 17 oil inlet of return check valve
It is connected.When it receives controller control signal, ratio open function can be controlled from the electro-hydraulic leveling valve group of multifunctional working bucket
Oil inlet P flows into the uninterrupted of rod chamber actuator port B1, is realized by its own self-compensating function and is loaded with leveling cyclinder 3
Unrelated retraction speed control.When its no signal inputs, rodless cavity actuator port B1 fluid connection return check valve 17 is realized
Oil inlet flows through return check valve 17 and connects the electro-hydraulic leveling valve group oil return inlet T of multifunctional working bucket.
Electromagnetic switch reversal valve 15 is three-position four-way electromagnetic directional valve, and effect is to realize the direction of motion of oscillating oil cylinder 4
Control.Its oil inlet is connected with the electro-hydraulic leveling valve group oil inlet P of multifunctional working bucket, and the first actuator port and first unidirectionally returns
Oily 161 oil inlet of throttle valve is connected, and the second actuator port is connected with the second unidirectional 162 oil inlet of meter out valve, oil return
Mouth is connected with 17 oil inlet of return check valve.
Unidirectional meter out valve 16 is the throttle valve of oil inlet all-pass meter out, and effect makes the oil return of oscillating oil cylinder 4
Throttling back pressure is formed, improves the small flow fine motion stability of oscillating oil cylinder.First unidirectional 161 oil outlet of meter out valve is with swinging
The first actuator port of oil cylinder A2 is connected, the second unidirectional 162 oil outlet of meter out valve and oscillating oil cylinder the second actuator port B2 phases
Even.
17 oil outlet of return check valve and 11 oil outlet of overflow valve, 12 oil outlet of off-load electronic proportioning valve, multifunctional working
The electro-hydraulic leveling valve group oil return inlet T that struggles against is connected.It is multifunctional working bucket when completely cutting off off-load 12 urgent off-load of electronic proportioning valve that it, which is acted on,
The high-velocity fluid that electro-hydraulic leveling valve group oil return inlet T is formed is to 3 compression shock of leveling cyclinder.
The electro-hydraulic leveling valve group 1 of multifunctional working bucket collectively constitutes working bucket with balanced valve 2, leveling cyclinder 3 and oscillating oil cylinder 4
Hydraulic control system.Wherein, balanced valve 2 is Bidirectional balanced valve, including the first balanced valve 21 and the second balanced valve 22.
Balanced valve 2 is Bidirectional balanced valve, and the first balanced valve 21 is set on the electro-hydraulic leveling valve group 1 of multifunctional working bucket and leveling oil
Between cylinder 3, effect is to prevent locking when stall caused by gravity and the standing of leveling cyclinder 3 of leveling cyclinder 3.Second balance
Valve 22 is set between the electro-hydraulic leveling valve group 1 of multifunctional working bucket and oscillating oil cylinder 4, and effect is to prevent oscillating oil cylinder 4 because of gravity
Locking when caused stall and oscillating oil cylinder 4 are stood.
The electro-hydraulic leveling valve group of multifunctional working bucket and its hydraulic control system of the utility model, because of two-bit triplet electronics ratio
It is flexible to complete leveling cyclinder proportionality velocity modulation stabilization without preposition speed governing valve compensation load pressure for example valve load self compensation ability.
Rodless cavity electronic proportioning valve and rod chamber electronic proportioning valve split arrangement, two electronic proportioning valve flow splits arrangement are easy to implement right
The high-resolution precise control of flew of the small flow of leveling cyclinder of asymmetric compression area；Because what unidirectional meter out valve was formed returns
The ratio unlatching of the off-load electronic proportioning valve of oil throttling back pressure and bypass arrangement can realize that working bucket oscillating oil cylinder proportionality velocity modulation revolves
Turn, the standby buffering off-load of working bucket, work are realized by the opening time of off-load electronic proportioning valve and the ratio setting of openings of sizes
Make the emergent stopping unloading function of bucket movement；Isolation off-load electronic proportioning valve emergent stopping off-load can be realized by return check valve
When the high-velocity fluid that is formed of the electro-hydraulic leveling valve group oil return opening of multifunctional working bucket leveling oil cylinder working-pressure is impacted.Multifunctional working bucket
The Integrated design of electro-hydraulic leveling valve group simplifies hydraulic system pipeline arrangement, and the multi-functional setting of off-load electronic proportioning valve reduces
Hydraulic system cost, operation principle are as follows：
1. leveling cyclinder proportionality velocity modulation is stablized flexible：It is closed, without bar when off-load electronic proportioning valve 12 receives controller signals
Chamber electronic proportioning valve 13 receives controller signals and is in left position ratio unlatching, rod chamber electronic proportioning valve 14 in acquiescence spring position
When, pressure oil flows through rodless cavity electronic proportioning valve 13 from the electro-hydraulic leveling valve group oil inlet P of multifunctional working bucket and reaches rodless cavity work
Make hydraulic fluid port A1, then flow through the first balanced valve 21 and flow into 3 rodless cavity of leveling cyclinder, release 3 piston rod of leveling cyclinder, be pushed out tune
Flat 3 rod chamber hydraulic oil of oil cylinder flows through the first balanced valve 21, rod chamber electronic proportioning valve 14 and return check valve 17 to multi-functional
The electro-hydraulic leveling valve group oil return inlet T of working bucket completes 3 extending action hydraulic circuit of leveling cyclinder；
When off-load electronic proportioning valve 12 receives controller signals closing, rod chamber electronic proportioning valve 14 receives controller signals
When being in acquiescence spring position in the unlatching of right position ratio, rodless cavity electronic proportioning valve 13, pressure oil is electro-hydraulic from multifunctional working bucket
Leveling valve group oil inlet P flows through rod chamber electronic proportioning valve 14 and reaches rod chamber actuator port B1, then flows through the second balanced valve
22 flow into 3 rod chambers of leveling cyclinder, push back 3 piston of leveling cyclinder, and being pushed back 3 rodless cavity hydraulic oil of leveling cyclinder, to flow through first flat
Valve 21, rodless cavity electronic proportioning valve 13 and return check valve 17 weigh to the electro-hydraulic leveling valve group oil return inlet T of multifunctional working bucket, it is complete
Into 3 retract action hydraulic circuit of leveling cyclinder；14 spool of rodless cavity electronic proportioning valve 13 and rod chamber electronic proportioning valve it is automatic
Compensation can compensate load pressure automatically, ensure output flow stable response controller signals.Rodless cavity electronic proportioning valve and there is bar
Chamber electronic proportioning valve arranges that two spool metered flow unsymmetrical arrangements are easy to implement to be pressurized to asymmetry using thread cartridge split
The high-resolution precise control of flew of the small flow of leveling cyclinder of area.
2. oscillating oil cylinder proportionality velocity modulation stablizes rotation：Opened when off-load electronic proportioning valve 12 receives controller signals ratio,
When electromagnetic switch reversal valve 15 receives controller signals and is in right position, partial pressure oil is from the electro-hydraulic leveling valve group of multifunctional working bucket
Oil inlet P flows through electromagnetic switch reversal valve 15, the first oil return one-way throttle valve 161 flows into oscillating oil cylinder the first actuator port A2,
Then flowing through the second balanced valve 22 inflow oscillating oil cylinder 4 pushes oscillating oil cylinder left-handed.The oil return that oscillating oil cylinder 4 is pushed out flows through
Two balanced valves 22, the second actuator port of oscillating oil cylinder B2, the second oil return one-way throttle valve 162, electromagnetic switch reversal valve 15 and return
Oily check valve 17 to the electro-hydraulic leveling valve group oil return inlet T of multifunctional working bucket, oscillating oil cylinder completes left-handed action.Another part pressure
Oil stream is through off-load electronic proportioning valve 12 to the electro-hydraulic leveling valve group oil return inlet T of multifunctional working bucket.
It is opened when off-load electronic proportioning valve 12 receives controller signals ratio, electromagnetic switch reversal valve 15 receives controller letter
Number be in left position when, partial pressure oil from the electro-hydraulic leveling valve group oil inlet P of multifunctional working bucket flow through electromagnetic switch reversal valve 15,
Second oil return one-way throttle valve 162 flows into oscillating oil cylinder the second actuator port B2, then flows through the second balanced valve 22 and flows into swing
Oil cylinder 4 pushes oscillating oil cylinder dextrorotation.The oil return that oscillating oil cylinder 4 is pushed out flows through the second balanced valve 22, oscillating oil cylinder first works
Hydraulic fluid port A2, the first oil return one-way throttle valve 161, electromagnetic switch reversal valve 15 and return check valve 17 are electro-hydraulic to multifunctional working bucket
Leveling valve group oil return inlet T, oscillating oil cylinder complete dextrorotation action.Another part pressure oil flows through the at most work(of off-load electronic proportioning valve 12
It can the electro-hydraulic leveling valve group oil return inlet T of working bucket.Oscillating oil cylinder load is relatively stable, and swing speed depends on flowing through off-load electronics ratio
Example valve 12 is to the electro-hydraulic leveling valve group oil return inlet T uninterrupted of multifunctional working bucket.Because unidirectional meter out valve 16 stablizes oil return section
It is more steady that stream back pressure moves the oscillating oil cylinder often to work under small flow 4, stablizes so as to fulfill oscillating oil cylinder proportionality velocity modulation
Rotation.
3. the standby buffering off-load of working bucket and emergent stopping off-load：
When working bucket switchs to standby from motion state, off-load electronic proportioning valve 12 receives controller signals in setting time
Interior ratio is opened, and pressure oil directly flows into the electro-hydraulic leveling valve group oil return inlet T of multifunctional working bucket through off-load electronic proportioning valve 12, complete
Into buffering unloading function.It is throttled and opened by the ratio of 12 setting time of off-load electronic proportioning valve, multifunctional working bucket is electro-hydraulic
P mouthfuls of high-pressure fluids of leveling valve group oil inlet slowly throttle release, and pressure potential is converted to thermal energy, high-pressure fluid is avoided so as to reach
The hydraulic shock of high-velocity fluid formation is generated because flow-passing surface becomes larger suddenly.
When working bucket switchs to emergent stopping under dangerous working condition from motion state, off-load electronic proportioning valve 12 receives control
Device signal is quickly opened in setting very short time, and pressure oil directly flows into multifunctional working bucket electricity through off-load electronic proportioning valve 12
Liquid leveling valve group oil return inlet T completes quick relief function.
4. completely cut off high-velocity fluid to impact leveling oil cylinder working-pressure：
P mouthfuls of multifunctional working bucket electro-hydraulic leveling valve group oil inlet is in the high-pressure fluid formed when working bucket moves.Work as work
When bucket switchs to emergent stopping under dangerous working condition from motion state, high-pressure fluid generates the high velocity stream bodily form because flow-passing surface becomes larger suddenly
Into hydraulic shock flee in the loop.The unidirectional cutoff function of return check valve 17 can completely cut off high-velocity fluid and recoil to leveling oil
Leveling cyclinder 3 vibrates caused by the oil inlet of cylinder 3.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, under the premise of the utility model technical principle is not departed from, several improvement and deformation can also be made, these change
The scope of protection of the utility model is also should be regarded as into deformation.
Claims (6)
1. a kind of electro-hydraulic leveling valve group of multifunctional working bucket, including leveling cyclinder (3) and oscillating oil cylinder (4), which is characterized in that also
Including balanced valve (2) and the electro-hydraulic leveling valve group (1) of working bucket, the balanced valve (2) is flat including the first balanced valve (21) and second
Weigh valve (22), and the electro-hydraulic leveling valve group (1) of working bucket is respectively communicated with V1 ends of first balanced valve (21), described first flat
V2 ends, the V1 ends of second balanced valve (22) and the V2 ends of second balanced valve (22) of weighing apparatus valve (21), described first is flat
The C1 ends of weighing apparatus valve (21), the C2 ends of the first balanced valve (21) are respectively communicated with the leveling cyclinder (3) two-port, second balance
The C1 ends of valve (22), second balanced valve (22) C2 ends be respectively communicated with the oscillating oil cylinder (4) two-port.
A kind of 2. electro-hydraulic leveling valve group of multifunctional working bucket according to claim 1, which is characterized in that the working bucket electricity
Liquid leveling valve group (1) includes the electro-hydraulic leveling valve group oil inlet (P) of working bucket, the electro-hydraulic leveling valve group oil return opening (T) of working bucket, unidirectional
Return valve (17), oscillating oil cylinder proportionality velocity modulation stablize rotation control mechanism and leveling cyclinder proportionality velocity modulation stablizes extension and contraction control machine
Structure, the leveling cyclinder proportionality velocity modulation stablize the V1 ends, described that pushing handle telescopic control mechanism is respectively communicated with first balanced valve (21)
The V2 ends of first balanced valve (21), the oscillating oil cylinder proportionality velocity modulation stablize rotation control mechanism and are respectively communicated with second balance
The V1 ends of valve (22) and the V2 ends of second balanced valve (22), the oscillating oil cylinder proportionality velocity modulation stabilization rotation control mechanism,
The leveling cyclinder proportionality velocity modulation stablizes pushing handle telescopic control mechanism and respectively connects the electro-hydraulic leveling valve group oil inlet of the working bucket
(P), unidirectional return valve (17) oil inlet is respectively communicated with the oscillating oil cylinder proportionality velocity modulation stabilization rotation control mechanism and institute
It states leveling cyclinder proportionality velocity modulation and stablizes pushing handle telescopic control mechanism, it is electro-hydraulic that unidirectional return valve (17) oil outlet connects the working bucket
Leveling valve group oil return opening (T).
A kind of 3. electro-hydraulic leveling valve group of multifunctional working bucket according to claim 2, which is characterized in that the leveling cyclinder
Proportionality velocity modulation stablizes pushing handle telescopic control mechanism and includes rodless cavity electronic proportioning valve (13) and rod chamber electronic proportioning valve (14), the nothing
Rod cavity electronic proportioning valve (13) oil inlet connects rod chamber electronic proportioning valve (14) oil inlet, the electro-hydraulic leveling of working bucket
Valve group oil inlet (P) connects rodless cavity electronic proportioning valve (13) oil inlet, the rod chamber electronic proportioning valve (14) oil inlet
Node a between mouthful, rodless cavity electronic proportioning valve (13) actuator port connect the V1 ends of first balanced valve (21), institute
State the V2 ends that rod chamber electronic proportioning valve (14) actuator port connects first balanced valve (21), the rodless cavity electrical proportional
Valve (13) oil return opening, the rod chamber electronic proportioning valve (14) oil return opening connect unidirectional return valve (17) oil inlet.
A kind of 4. electro-hydraulic leveling valve group of multifunctional working bucket according to claim 3, it is characterised in that the oscillating oil cylinder
Proportionality velocity modulation stablizes rotation control mechanism, described unidirectional including electromagnetic switch reversal valve (15) and unidirectional meter out valve (16)
Meter out valve (16) includes the first unidirectional meter out valve (161) and the second unidirectional meter out valve (162), and the electromagnetism is opened
It closes reversal valve (15) oil inlet and connects the node a, (15) first actuator port of the electromagnetic switch reversal valve connection described the
One unidirectional meter out valve (161) oil inlet, (15) second actuator port of the electromagnetic switch reversal valve connection described second are single
To meter out valve (162) oil inlet, electromagnetic switch reversal valve (15) oil return opening connect the unidirectional return valve (17) into
Hydraulic fluid port.
5. the electro-hydraulic leveling valve group of a kind of multifunctional working bucket according to claim 3, which is characterized in that including overflow valve
(11), overflow valve (11) oil inlet connects the node a, and overflow valve (11) oil outlet connects the unidirectional return valve
(17) oil outlet.
6. the electro-hydraulic leveling valve group of a kind of multifunctional working bucket according to claim 3, which is characterized in that including off-load electronics
Proportioning valve (12), off-load electronic proportioning valve (12) oil inlet connect the node a, and the off-load electronic proportioning valve (12) goes out
Hydraulic fluid port connects unidirectional return valve (17) oil outlet.
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| CN107605843A (en) * | 2017-10-12 | 2018-01-19 | 徐州徐工随车起重机有限公司 | A kind of electro-hydraulic leveling valve group of multifunctional working bucket |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107605843A (en) * | 2017-10-12 | 2018-01-19 | 徐州徐工随车起重机有限公司 | A kind of electro-hydraulic leveling valve group of multifunctional working bucket |
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