CN108128703A - A kind of hydraulic system of crane - Google Patents
A kind of hydraulic system of crane Download PDFInfo
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- CN108128703A CN108128703A CN201711201879.6A CN201711201879A CN108128703A CN 108128703 A CN108128703 A CN 108128703A CN 201711201879 A CN201711201879 A CN 201711201879A CN 108128703 A CN108128703 A CN 108128703A
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- valve
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- differentially
- revolution
- load
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/72—Counterweights or supports for balancing lifting couples
- B66C23/78—Supports, e.g. outriggers, for mobile cranes
- B66C23/80—Supports, e.g. outriggers, for mobile cranes hydraulically actuated
Abstract
The invention discloses a kind of hydraulic systems of crane, the system get on the bus multi-way valve respectively work connection in position when flow no longer by the first pressure-differentially-set valve setup pressure value off-load, but middle position unloading valve off-load is directly over, greatly reduce bit-loss in constant displacement pump load sensitive system；When main work, which joins, to be carried out micro-control or manipulate at a slow speed, main pump redundance flow can be selected to rotary system fuel feeding, to make full use of its excess traffic；When main work connection needs progress quick acting or progress composite move and revolution is failure to actuate, supporting leg drum pump can be carried out and collaborated with main pump, improve main work receipts or other documents in duplicate movement speed and composite move performance；When main work connection carries out quick or composite move, if carrying out revolution action, revolution action can be independently carried out, main work system and rotary system are mutual indepedent, unaffected.
Description
Technical field
The invention belongs to crane technical field of hydraulic pressure, and in particular to a kind of hydraulic system of crane.
Background technology
System for hydraulic system of truck crane mainly has upper vehicle hydraulic system and lower vehicle hydraulic system, and upper vehicle hydraulic system mainly wraps
Include changing-breadth system, telescopic system, rotary system and major-minor hoisting system；Lower vehicle hydraulic system mainly includes leg system；Accordingly
Crane multi-way valve mainly get on the bus multi-way valve and step-down multi-way valve, multi-way valve of getting on the bus is usually load sensing multi-way valve, right
In medium and small tonnage crane generally use constant displacement pump load sensitive system, main pump is supplied to flexible, luffing, master file and secondary volume
Oil；Step-down multi-way valve is common reversal valve, individually sets a constant displacement pump, mainly to leg system and rotary system fuel feeding, because
There need to be the functions such as commutation, buffering, repairing, free rotary for rotary system, usually individually system is turned round in the control of setting rotary buffering valve
System, supporting leg drum pump hydraulic oil lead to rotary system when supporting leg is not acted on by step-down multi-way valve；Main pump and supporting leg drum pump
Independently of each other, it is independent of each other.
The technical solution of crane of the prior art includes：
(1) constant displacement pump load sensitive system is combined using constant displacement pump with load sensing multi-way valve, according to needed for work connection
Flow fuel feeding, excess traffic by main pressure-differentially-set valve off-load oil return box, when main valve respectively work connection be all failure to actuate when, main pump hydraulic oil
Pressure is set from main pressure-differentially-set valve off-load with main pressure-differentially-set valve spring completely.
(2) rotary system realizes revolute function by means of rotary buffering valve and the constant displacement pump shared with leg system, is returning
Turn and supporting leg is not when acting on, which directly passes through rotary buffering valve off-load.
(3) multichannel of getting on the bus valve control system and step-down multi-way valve control system are mutual indepedent, multi-way valve of getting on the bus control lifting
Machine telescopic arm stretches, luffing landing, major-minor volume lifting；Step-down multi-way valve mainly controls landing leg stretching of getting off, while leads to revolution
System hydraulic oil passes through step-down multi-way valve, and the control of rotary system is mainly controlled by rotary buffering valve.
The shortcomings that said program is mainly：
(1) during main valve respectively joins during position, all flows of main pump are from main pressure-differentially-set valve off-load oil return box, main because system needs
Pressure-differentially-set valve spring setting value is lost in 2MPa or so, main pump output flow with main pressure-differentially-set valve spring setup pressure value off-load
It is larger；
(2) when main work linkage is made, in especially carrying out, heavy load micro-control, when manipulating at a slow speed, pump discharge pressure is higher,
The flow for leading to load is less, and for most of middle high-pressure flow then by main pressure-differentially-set valve off-load oil return box, power loss is serious.
(3) rotary system and the constant displacement pump that leg system of getting off shares is individually for directly to unload when supporting leg and revolution do not act on
Lotus, it is impossible to it makes full use of, and crane wishes speed in small load, wishes coordination in composite move, due to
Underfed during composite move, it may appear that the big work of load joins situation that is slow in one's movements or even stopping, system composite move performance
Difference.
Invention content
In view of the above-mentioned problems, the present invention proposes a kind of hydraulic system of crane, join not in the main work for multi-way valve of getting on the bus
During action, the hydraulic oil directly therefrom position unloading valve off-load in main pump, compared with from the first pressure-differentially-set valve (i.e. main pressure-differentially-set valve) off-load
Loss significantly reduces；When main work, which joins, to be carried out micro-control or manipulate at a slow speed, main pump redundance flow can be selected to revolution system
System fuel feeding, to make full use of its excess traffic；When main work connection needs to carry out quick acting or progress composite move and turns round not
During action, supporting leg drum pump can be carried out and collaborated with main pump, improve main work receipts or other documents in duplicate movement speed and composite move performance.
It realizes above-mentioned technical purpose, reaches above-mentioned technique effect, the invention is realized by the following technical scheme：
A kind of hydraulic system of crane, including main pump and supporting leg drum pump；
The oil outlet of the main pump is connected respectively to overflow valve, middle position unloading valve, the first pressure-differentially-set valve, multi-way valve of getting on the bus
The oil inlet of main work connection, the overflow valve, middle position unloading valve, the first pressure-differentially-set valve oil outlet be connected respectively with fuel tank；Together
When, the oil outlet of the main pump is also opened by the diverting switch valve that is sequentially connected, the first check valve, third pressure-differentially-set valve, revolution
Valve is closed with the rotary buffering valve in rotary system to be connected；
The guide end of the main work connection of the multi-way valve of getting on the bus is connected with the guide end of middle position unloading valve, while also by the
One solenoid valve is connected with collaborating the guide end of off-load selector valve；The LS pressure signals effect of the main work connection of the multi-way valve of getting on the bus
To the first pressure-differentially-set valve, while also by feedback pressure selector valve selection index system to the second pressure-differentially-set valve；
The outlet of the supporting leg drum pump is connected by collaborating control valve and the second check valve with main pump oil outlet, is also passed through
Step-down multi-way valve, third check valve, third pressure-differentially-set valve, the revolution switch valve being sequentially connected are buffered with the revolution in rotary system
Valve is connected；The supporting leg pilot pressure is by the second shuttle valve selection index system to the guide end of interflow control valve；
The revolution load pressure of rotary buffering valve in the rotary system is arrived by feedback pressure selector valve selection index system
Second pressure-differentially-set valve and third pressure-differentially-set valve；The revolution pilot pressure signal of the rotary buffering valve is made by the selection of the first shuttle valve
The guide end of feedback pressure selector valve is used, while is also applied to interflow control valve by the second shuttle valve；It is selected by the first shuttle valve
The revolution pilot pressure for selecting effect is also applied to the guide end of revolution off-load selector valve by second solenoid valve；The multichannel of getting off
The pilot pressure signal of valve is through the second shuttle valve selection index system to the guide end of interflow control valve.
Further, the middle position unloading valve normality position is equipped with first to open, at pilot port into oil damping and first
Bypass damping, the pilot pressure of the main work connection output for multi-way valve of getting on the bus pass through first into oil damping, the first bypass damping action
To middle position unloading valve, middle position unloading valve is made steadily to close.
Further, first pressure-differentially-set valve, the second pressure-differentially-set valve, third pressure-differentially-set valve, interflow off-load selector valve, the
The spring setting value of one overflow valve is adjustable.
Further, in the main work for multi-way valve of getting on the bus connection carries out, heavy load micro-control or during slow control action, first
Pressure-differentially-set valve entrance establishes larger pressure, and excess traffic is from the first pressure-differentially-set valve off-load, slow in revolution if turning round leading role
It rushes before valve valve port do not open, rotary buffering valve pilot pressure opens revolution switch valve, and rotary buffering valve pilot pressure is simultaneously
Interflow control valve is applied to by the first shuttle valve, makes its closing, part mesohigh hydraulic oil passes through diverting switch valve, first unidirectionally
Rotary system is applied to after valve, third pressure-differentially-set valve, carries out revolution action, and turn round movement speed and rotary handle pilot pressure
Corresponding, supporting leg drum pump is in unloading condition at this time.
Further, first pressure-differentially-set valve is equipped with second into oil damping；The interflow control valve guide end is equipped with
4th damps into oil damping and third bypass.
Further, when rotary system does not act on, the hydraulic oil of supporting leg drum pump is directly over step-down multi-way valve, interflow
Off-load selector valve, revolution off-load selector valve off-load；
When turning round guide's action and need supporting leg drum pump independent to rotary system fuel feeding, then second solenoid valve obtains electric,
Revolution pilot pressure is made to be applied to interflow control valve, revolution off-load selector valve, diverting switch valve using the first shuttle valve, return supporting leg
Turning pump can be independently to rotary system fuel feeding, and the diverting switch valve guide end connects third into oil damping and the second bypass damping.
Further, when get on the bus need quick acting or carry out composite move and revolution be not required to action when, the first solenoid valve
It is electric, then the main work of multi-way valve of getting on the bus connection pilot pressure closes interflow off-load selector valve, and supporting leg drum pump stops off-load, warp
Interflow control valve and the second check valve are crossed together with main pump to the main work for multi-way valve of getting on the bus connection hydraulic circuit interflow, feedback pressure
Selector valve is applied to LS pressure signals on the second pressure-differentially-set valve, and supporting leg drum pump is enable to be collaborated, without direct off-load.
Further, when carrying out supporting leg control, step-down multi-way valve pilot pressure closes interflow control valve, supporting leg revolution
The hydraulic oil of pump leads to step-down multi-way valve and carries out supporting leg control completely.
Compared with prior art, beneficial effects of the present invention：
(1) when the main work for multi-way valve of getting on the bus connection is failure to actuate, the hydraulic oil directly therefrom position unloading valve off-load in main pump,
It is apparent compared with being reduced from the first pressure-differentially-set valve off-load loss；
(2) when the main work for multi-way valve of getting on the bus connection carry out in, heavy load and in, manipulate at a slow speed when, if rotary system moves
Make, then main pump partial discharge can lead to rotary system, be utilized excess traffic part, and power loss reduces；
(3) when rotary system is failure to actuate, when flow needed for the main work connection for multi-way valve of getting on the bus is larger, supporting leg revolution pump liquid
Pressure oil can collaborate with main pump, improve the main work connection movement velocity and composite performance of multi-way valve of getting on the bus, while make supporting leg drum pump
It is fully used.
Description of the drawings
Fig. 1 is the crane hydraulic system schematic diagram of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The application principle of the present invention is explained in detail below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of hydraulic system of crane, including main pump 1 and supporting leg drum pump 2, the main pump 1 and supporting leg
Drum pump 2 is coaxially disposed；
The oil outlet of the main pump 1 is connected respectively to overflow valve 3, middle position unloading valve 6,8 (i.e. main level pressure of the first pressure-differentially-set valve
Difference limen), the oil inlet of the main work of multi-way valve of getting on the bus connection 9, the overflow valve 3, middle position unloading valve 6, the first pressure-differentially-set valve 8 go out
Hydraulic fluid port is connected respectively with fuel tank；Meanwhile the oil outlet of the main pump 1 is also single by the diverting switch valve 10, first being sequentially connected
It is connected to valve 11, third pressure-differentially-set valve 23, revolution switch valve 24 with the rotary buffering valve 25 in rotary system, for by main pump 1
The hydraulic oil of output is applied to rotary system；The guide end of the diverting switch valve 10 is connected with third into oil damping 12 and second
Bypass damping 13；
The guide end of the main work connection 9 of the multi-way valve of getting on the bus is connected, while also pass through with the guide end of middle position unloading valve 6
First solenoid valve 27 is connected with collaborating the guide end of off-load selector valve 29, and pilot pressure is applied to interflow off-load selector valve 29
Guide end；The LS pressure signals of the main work connection 9 of the multi-way valve of getting on the bus are applied to the first pressure-differentially-set valve 8, first level pressure
Difference limen 8 is equipped with second into oil damping 7, while also by 18 selection index system of feedback pressure selector valve to the second pressure-differentially-set valve 20；
The 6 normality position of middle position unloading valve is opens；First is equipped at the pilot port of the middle position unloading valve 6 into oil damping 4 and first
Bypass damping 5, makes middle position unloading valve 6 steadily close；
The outlet of the supporting leg drum pump 2 is connected by collaborating 15 and second check valve 14 of control valve with 1 oil outlet of main pump,
Also it is with revolution by the step-down multi-way valve 21, third check valve 22, third pressure-differentially-set valve 23, the revolution switch valve 24 that are sequentially connected
Rotary buffering valve 25 in system is connected；
The revolution load pressure of rotary buffering valve 25 in the rotary system selects to make by feedback pressure selector valve 18
Use the second pressure-differentially-set valve 20 and third pressure-differentially-set valve 23；The revolution pilot pressure signal of the rotary buffering valve 25 passes through first
26 selection index system of shuttle valve is also applied to interflow control valve to the guide end of feedback pressure selector valve 18 by the second shuttle valve 31
15, and interflow 15 guide end of control valve has into oil damping 16 and bypass damping 17；Revolution by the selection of the first shuttle valve 26 is first
Pilot power is also applied to the guide end of revolution off-load selector valve 29 by second solenoid valve 28；The guide of the step-down multi-way valve 21
Pressure signal is through 31 selection index system of the second shuttle valve to the guide end of interflow control valve 15.
In the present invention is implemented, first pressure-differentially-set valve 8, the second pressure-differentially-set valve 20, third pressure-differentially-set valve 23, interflow are unloaded
Lotus selector valve 29, the spring setting value of the first overflow valve 3 is adjustable.
The specific work process of hydraulic system of the crane of the present invention is：
(1) when the main work for multi-way valve of getting on the bus connection 9 is without pilot pressure, (each work connection for multi-way valve of getting on the bus does not work
When), middle position unloading valve 6 is normally opened, and the hydraulic oil in main pump 1 is directly over middle 6 off-load of position unloading valve；
When the main work connection 9 for multi-way valve of getting on the bus has pilot pressure (the main work connection effect for multi-way valve of getting on the bus), the master
Work connection spool corresponds to certain guide dead zone, main work connection spool valve port reach open needed for pilot pressure it
Before, pilot pressure is applied to middle position unloading valve 6 by first into the bypass of oil damping 4, first damping 5, it is made steadily to close, hydraulic pressure
Oil all sets pressure from 8 off-load of the first pressure-differentially-set valve with the spring of the first pressure-differentially-set valve 8；
When the spool unlatching that the pilot pressure of the main work connection 9 for multi-way valve of getting on the bus joins work has flow to pass through and first pilot
When power gradually increases, hydraulic oil is reduced from 8 off-load of the first pressure-differentially-set valve, and the main work to multi-way valve of getting on the bus, which joins 9 flows, to be increased.
(2) it is poor in the first level pressure in the main work for multi-way valve of getting on the bus connection 9 carries out, heavy load micro-control or when acting at a slow speed
8 entrance of valve establishes larger pressure, and excess traffic from the first pressure-differentially-set valve 8 with larger pressure off-load, if revolution leading role,
Before 25 valve port of rotary buffering valve is not opened, 25 pilot pressure of rotary buffering valve opens revolution switch valve 24, revolution buffering
25 pilot pressure of valve is applied to interflow control valve 15 by the first shuttle valve 26 simultaneously, makes its closing, part mesohigh hydraulic oil warp
Rotary system is applied to after crossing shunting switch valve 10, the first check valve 11, third pressure-differentially-set valve 23, carries out revolution action, and return
It is corresponding with rotary handle pilot pressure to turn movement speed, supporting leg drum pump 22 is in unloading condition at this time；
If the main work connection 9 for multi-way valve of getting on the bus carries out quick actings or composite move, when required flow is larger, at this time such as
Fruit carries out revolution action, then it is not recommended that carrying out needing supporting leg drum pump 2 independent to revolution system to rotary system shunting or operator
System fuel feeding then can obtain second solenoid valve 28 electric, and revolution pilot pressure is applied to revolution off-load selector valve 30, makes its closing, makes
Supporting leg drum pump 2 stops off-load, makes it to rotary system fuel feeding, while turn round pilot pressure and be applied to diverting switch valve 10, makes
It is closed, and for main pump 1 no longer to rotary system fuel feeding, 2 excess traffic of supporting leg drum pump no longer passes through overflowing in step-down multi-way valve 21
Valve overflow is flowed, but from 20 off-load of the second pressure-differentially-set valve.
Feedback pressure selector valve 18 act as when have revolution and main work in conjunction with when act on when, and to be more than revolution negative for LS pressure
When carrying pressure, the pressure for ensureing to feed back to the second pressure-differentially-set valve 20 is revolution load pressure, enables its excess traffic from second
20 off-load of pressure-differentially-set valve.
(3) when rotary system does not act on, the hydraulic oil of supporting leg drum pump 2 is directly over step-down multi-way valve 21, interflow is unloaded
Lotus selector valve 29,30 off-load of revolution off-load selector valve；The 10 guide end of diverting switch valve connects third into oil damping 12 and the
Two bypass dampings 13；Quick acting is carried out when getting on the bus or to carry out flow needed for composite move larger, and when revolution is not required to action, the
One solenoid valve 27 must be electric, then the main work for multi-way valve of getting on the bus, which joins 9 pilot pressures, closes interflow off-load selector valve 29, supporting leg revolution
Pump 2 stops off-load, by collaborating 15 and second check valve 14 of control valve with main pump 1 together to the main work for multi-way valve of getting on the bus connection 9
Hydraulic system is collaborated, and feedback pressure selector valve is applied to LS pressure signals on the second pressure-differentially-set valve 20, enables supporting leg drum pump 2
Enough collaborated, without direct off-load.
(4) when carrying out supporting leg control, 21 pilot pressure of step-down multi-way valve closes interflow control valve 15, supporting leg drum pump
2 hydraulic oil leads to step-down multi-way valve 21 and carries out supporting leg control completely.
In summary：
(1) when the main work for multi-way valve of getting on the bus connection is failure to actuate, hydraulic oil in main pump directly from unloading valve off-load, compared with from
Main pressure-differentially-set valve off-load loss reduces apparent；
(2) when during the main work for multi-way valve of getting on the bus connection carries out, heavy load and micro-control or low speed manipulate when, if rotary system
It acts, then main pump partial discharge can lead to rotary system, be utilized excess traffic part, and power loss reduces；
(3) when rotary system is failure to actuate, when flow needed for the main work connection for multi-way valve of getting on the bus is larger, supporting leg revolution pump liquid
Pressure oil can collaborate with main pump, improve the main work connection movement velocity and composite performance of multi-way valve of getting on the bus, while make supporting leg drum pump
It is fully used.
The basic principles, main features and the advantages of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (8)
1. a kind of hydraulic system of crane, it is characterised in that：Including main pump and supporting leg drum pump；
The oil outlet of the main pump is connected respectively to the main work of overflow valve, middle position unloading valve, the first pressure-differentially-set valve, multi-way valve of getting on the bus
Make the oil inlet that joins, the overflow valve, middle position unloading valve, the first pressure-differentially-set valve oil outlet be connected respectively with fuel tank；
Meanwhile the oil outlet of the main pump also by the diverting switch valve that is sequentially connected, the first check valve, third pressure-differentially-set valve,
Revolution switch valve is connected with the rotary buffering valve in rotary system；
The guide end of the main work connection of the multi-way valve of getting on the bus is connected with the guide end of middle position unloading valve, while also passes through the first electricity
Magnet valve is connected with collaborating the guide end of off-load selector valve；The LS pressure signals of the main work connection of the multi-way valve of getting on the bus are applied to the
One pressure-differentially-set valve, while also by feedback pressure selector valve selection index system to the second pressure-differentially-set valve；
The outlet of the supporting leg drum pump is connected by collaborating control valve and the second check valve with main pump oil outlet, also by sequentially
Connected step-down multi-way valve, third check valve, third pressure-differentially-set valve, revolution switch valve and the rotary buffering valve phase in rotary system
Even；The supporting leg pilot pressure is by the second shuttle valve selection index system to the guide end of interflow control valve；
The revolution load pressure of rotary buffering valve in the rotary system passes through feedback pressure selector valve selection index system to second
Pressure-differentially-set valve and third pressure-differentially-set valve；The revolution pilot pressure signal of the rotary buffering valve is arrived by the first shuttle valve selection index system
The guide end of feedback pressure selector valve, while also interflow control valve is applied to by the second shuttle valve；It selects to make by the first shuttle valve
Revolution pilot pressure is also applied to the guide end of revolution off-load selector valve by second solenoid valve；The step-down multi-way valve
Pilot pressure signal is through the second shuttle valve selection index system to the guide end of interflow control valve.
2. a kind of hydraulic system of crane according to claim 1, it is characterised in that：The middle position unloading valve normality position
First is equipped with to open, at pilot port into oil damping and the first bypass damping, the elder generation of the main work connection output for multi-way valve of getting on the bus
Pilot power, into oil damping, the first bypass damping action to middle position unloading valve, makes middle position unloading valve steadily close by first.
3. a kind of hydraulic system of crane according to claim 1, it is characterised in that：First pressure-differentially-set valve,
Two pressure-differentially-set valves, third pressure-differentially-set valve, interflow off-load selector valve, the spring setting value of the first overflow valve is adjustable.
4. a kind of hydraulic system of crane according to claim 1, it is characterised in that：When the main work for multi-way valve of getting on the bus
Connection carry out in, heavy load micro-control or during slow control action, establish larger pressure in the first pressure-differentially-set valve entrance, and excess traffic from
First pressure-differentially-set valve off-load, if revolution leading role, before rotary buffering valve valve port is not opened, rotary buffering valve pilot pressure
Revolution switch valve is opened, rotary buffering valve pilot pressure is applied to interflow control valve by the first shuttle valve simultaneously, makes its closing,
Part mesohigh hydraulic oil is applied to rotary system after diverting switch valve, the first check valve, third pressure-differentially-set valve, is returned
Rotation is made, and revolution movement speed is corresponding with rotary handle pilot pressure, and supporting leg drum pump is in unloading condition at this time.
5. a kind of hydraulic system of crane according to claim 1, it is characterised in that：It is set on first pressure-differentially-set valve
Have second into oil damping；The interflow control valve guide end is equipped with the 4th into oil damping and third bypass damping.
6. a kind of hydraulic system of crane according to claim 1, it is characterised in that：
When rotary system does not act on, the hydraulic oil of supporting leg drum pump is directly over step-down multi-way valve, interflow off-load selector valve, returns
Unloading lotus selector valve off-load；
When turning round guide's action, and need supporting leg drum pump independent to rotary system fuel feeding, then second solenoid valve obtains electric, utilizes
First shuttle valve makes revolution pilot pressure be applied to interflow control valve, revolution off-load selector valve, diverting switch valve, makes supporting leg drum pump
Can be independently to rotary system fuel feeding, the diverting switch valve guide end connects third into oil damping and the second bypass damping.
7. a kind of hydraulic system of crane according to claim 1, it is characterised in that：
It needs quick acting when getting on the bus or carries out composite move and when revolution is not required to action, the first solenoid valve obtains electric, then gets on the bus more
The main work connection pilot pressure of road valve closes interflow off-load selector valve, and supporting leg drum pump stops off-load, by collaborating control valve
LS is pressed to the main work for multi-way valve of getting on the bus connection hydraulic circuit interflow, feedback pressure selector valve together with main pump with the second check valve
Force signal is applied on the second pressure-differentially-set valve, and supporting leg drum pump is enable to be collaborated, without direct off-load.
8. a kind of hydraulic system of crane according to claim 1, it is characterised in that：When carrying out supporting leg control, under
Vehicle multi-way valve pilot pressure closes interflow control valve, and the hydraulic oil of supporting leg drum pump leads to step-down multi-way valve and carries out supporting leg completely
Control.
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Effective date of registration: 20220722 Address after: No.26 tuolanshan Road, Xuzhou Economic and Technological Development Zone, Xuzhou City, Jiangsu Province Patentee after: JIANGSU XUGONG ENGINEERING MACHINERY RESEARCH INSTITUTE Co.,Ltd. Address before: 221004 26 Jinshan Road, Jinshan Bridge Economic Development Zone, Xuzhou, Jiangsu Patentee before: XCMG CONSTRUCTION MACHINERY Co.,Ltd. |
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Application publication date: 20180608 Assignee: Xuzhou Heavy Machinery Co.,Ltd. Assignor: JIANGSU XUGONG ENGINEERING MACHINERY RESEARCH INSTITUTE Co.,Ltd. Contract record no.: X2022980019352 Denomination of invention: Hydraulic system of a crane Granted publication date: 20190521 License type: Common License Record date: 20221024 |