CN104088830B - The hydraulic system and its pilot-operated type control valve of a kind of crane - Google Patents
The hydraulic system and its pilot-operated type control valve of a kind of crane Download PDFInfo
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- CN104088830B CN104088830B CN201410371672.3A CN201410371672A CN104088830B CN 104088830 B CN104088830 B CN 104088830B CN 201410371672 A CN201410371672 A CN 201410371672A CN 104088830 B CN104088830 B CN 104088830B
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Abstract
The present invention provides the hydraulic system and its pilot-operated type control valve of a kind of crane, it is possible to increase the unloading rate of guide oil, so as to quick relief, it is to avoid overload crane, it is ensured that the security that crane is used.The pilot-operated type control valve includes the main valve with control port and the pilot valve connected with the control port, the pilot valve has the first working position for connecting the control port with oil pump and the second working position for connecting the control port with fuel tank, and the control port of the main valve is also connected by switch with fuel tank.When needing to release guide oil so that main valve stopping is acted, pilot valve can be switched to the second working position, fuel tank is discharged into so as to the guide oil of control port；Meanwhile, the control port of main valve is also connected by switch with fuel tank, to form two off-load oil circuits, and then is accelerated unloading rate, is completed the quick relief of guide oil, and then improves the response speed of main valve, realizes reliable control.
Description
Technical field
The present invention relates to crane technical field, the hydraulic system and its pilot-operated type of more particularly to a kind of crane are controlled
Valve.
Background technology
Crane is widely used visual plant in engineering construction, mainly including bases such as raising, flexible, luffing, revolutions
This action, these actions drive by hydraulic system.Certainly, when driving crane job using hydraulic system, it should prevent
Overload crane, and stop driving crane in the operation in direction that overloads when detecting overload crane.
Generally, crane is when doing the action that luffing rises, contracting arm, elevator fall, and the rotating torque produced by arm support diminishes, no
The risk that crane is toppled over can be increased, therefore its operative orientation is safe direction；It is opposite, crane do luffing fall, semi-girder, volume
During the action kicked up, operative orientation is non-security direction.
In the prior art, hydraulic system is controlled using pilot-operated type control valve to hydraulic circuit, to drive crane complete
Into above-mentioned operation.For the limit overload operating mode for, if pilot control oil can not off-load rapidly, cause crane non-security
Continue operation in direction, it is likely that crane can be caused damage, or even trigger security incident.
Fig. 1 is refer to, Fig. 1 is set for pilot-operated type control valve one kind that the hydraulic system of crane in the prior art is used
The schematic diagram of mode.
Existing hydraulic system includes variable amplitude hydraulic system, telescopic arm hydraulic system and hoisting hydraulic system, each hydraulic pressure
System is equipped with a pilot-operated type control valve, and each pilot-operated type control valve includes main valve and pilot valve.As shown in figure 1, luffing
Hydraulic system includes the first main valve 1 ' and the first pilot valve 4 ' and the second pilot valve that are respectively communicated with the control port at its two ends
5’；Telescopic arm hydraulic system includes the second main valve 2 ' and the 3rd pilot valve 6 ' being respectively communicated with the control port at its two ends and the
Four pilot valves 7 '；Hoisting hydraulic system includes the 3rd main valve 3 ' and the 5th pilot valve being respectively communicated with the control port at its two ends
8 ' and the 6th pilot valve 9 '.Wherein, the first pilot valve 4 ', the second pilot valve 5 ', the 3rd pilot valve 6 ', the 4th pilot valve 7 ',
Five pilot valves 8 ' and the 6th pilot valve 9 ' are electric proportional pilot valve；First main valve 1 ', the second main valve 2 ' and the 3rd main valve 3 ' are
3 position-5 way surges proportioning valve, and the P mouths in Fig. 1 are oil inlet；And first, second grade sequencer it is equal exemplified by distinguish different guides
Valve, is not offered as certain specific order.
By taking variable amplitude hydraulic system as an example, the first pilot valve 4 ' is used to control crane progress luffing to fall, the second pilot valve 5 '
Risen for controlling crane to carry out luffing, and both of which has the joystick for adjusting its size of current.When crane does luffing
When playing action, gradually increase the aperture of the joystick of the second pilot valve 5 ', then act on the electric current increase of the second pilot valve 5 ',
The right position valve port opening of second pilot valve 5 ' gradually increases, and control oil acts on the right side of the first main valve 1 ' by the second pilot valve 5 '
Side control port so that the right position valve port opening increase of the first main valve 1 ', driving amplitude oil cylinder completes the action that luffing rises；Work as control
When handle processed returns middle position, the electric current for acting on the second pilot valve 5 ' is gradually reduced so that the right position valve port opening of the first main valve 1 '
Gradually reduce, the slow off-load in left position that control oil passes through the second pilot valve 5 '.Similarly, when crane, which does luffing, to be fallen to act, by
The aperture of the joystick of cumulative plus the first pilot valve 4 ', to control oil to act on the first main valve 1 ' by the first pilot valve 4 '
Left side so that the left side valve port opening increase of the first main valve 1 ', driving amplitude oil cylinder completes the action that luffing falls；When control hand
When handle returns middle position, the left side valve port opening of the first main valve 1 ' is gradually reduced, the right position off-load that control oil passes through the first pilot valve 4 '.
It can be seen that, off-load is carried out by pilot valve in the prior art, but be due to that pilot valve compares for electric proportional pilot valve, and electricity
There is larger slow characteristic in example pilot valve, cause the guide oil of main valve to postpone off-load；Meanwhile, the action of electric proportional pilot valve is put down
It is steady and slow, cause the speed of off-load more slow, further extend time of the crane in the overload operation of non-security direction.
When crane proceeds the operation of the limiting conditions such as overload in non-security direction, unpredictable damage can be caused to crane
Evil, or even trigger security incident.
Therefore, a kind of pilot-operated type control valve how is designed, to improve the unloading rate of guide oil, and then prevents crane from surpassing
Carry, it is ensured that the security performance of crane, is the current technical issues that need to address of those skilled in the art.
The content of the invention
It is an object of the invention to provide a kind of pilot-operated type control valve, it is possible to increase the unloading rate of guide oil, so as to quick
Off-load, is achieved effective control.
It is a further object of the present invention to provide a kind of hydraulic system of crane, using above-mentioned pilot-operated type control valve to hydraulic pressure
Oil circuit is controlled, and to realize the quick relief of guide oil, and then improves the response speed of hydraulic circuit, it is to avoid crane surpasses
Carry, it is ensured that the security that crane is used.
In order to solve the above technical problems, the present invention provides a kind of pilot-operated type control valve, including the main valve with control port
The pilot valve connected with the control port, the pilot valve has the first work for connecting the control port with oil pump
Position and the second working position for connecting the control port with fuel tank, the control port of the main valve are also connected by switch with fuel tank
It is logical.
The pilot-operated type control valve of the present invention, can be by pilot valve when needing to release guide oil so that main valve stopping is acted
The second working position is switched to, fuel tank is discharged into so as to the guide oil of control port；Meanwhile, the control port of main valve also by switch with
Fuel tank is connected, then can open switch simultaneously, is connected simultaneously by switch with fuel tank so as to the guide oil of control port.Namely
Say, pilot-operated type control valve of the invention is connected with fuel tank simultaneously by pilot valve and switch, to form two off-load oil circuits, and then
Accelerate unloading rate, complete the quick relief of guide oil, and then improve the response speed of main valve, realize reliable control.
Preferably, the control port is additionally provided with check valve by described switch on the oil circuit connected with fuel tank, to ensure
The guide oil of control port unidirectionally flows to fuel tank, it is to avoid the oil in other oil circuits produces interference to guide's oil circuit.
Preferably, the control port includes the first control port and the second control port, and the pilot valve includes and institute
The second pilot valve stated the first pilot valve of the first control port connection and connected with second control port, described first first
Pilot valve and second pilot valve are respectively provided with first working position and second working position, first control port and institute
The second control port is stated to connect by the switch.
The main valve of the present invention can set two control ports, and be connected two control ports by switching, due to two
Individual control port is respectively connected with pilot valve, and pilot valve can switch to the working position connected with fuel tank, then when one of control
When liquefaction mouthful needs to release guide oil, it can not only be connected by the pilot valve communicated therewith, switch can also be opened to incite somebody to action
Its pilot valve connected with another control port is connected, i.e. the control port is connected by two pilot valves with fuel tank simultaneously,
Two off-load oil circuits are formed, quick relief is realized.
Using said structure, it is only necessary to set switch between two control port, its structure is relatively simple；Even more important
It is that two pilot valves independently can be not only controlled to two control ports, can also be in parallel when needing off-load, with same
When carry out off-load for control port, improve off-load efficiency.
Preferably, the switch be with open and two working positions of closure magnetic valve, the response speed of magnetic valve compared with
It hurry up, can quickly open off-load oil circuit.
Preferably, the magnetic valve is zero leakage reversal valve, to improve the reliability of switching.
Preferably, the zero leakage reversal valve is bi-bit bi-pass reversal valve, when in Operating In Persistent Current Mode position, two work
Hydraulic fluid port is ended by check valve；When in unlatching working position, the connection of two actuator port.Said structure is relatively simple, switching
Reliability is higher, can realize fast opening and closing.
Preferably, the magnetic valve is two-position four way change valve, including two cut-off hydraulic fluid ports and two actuator ports, works as place
When Operating In Persistent Current Mode position, actuator port described in two is connected with ending hydraulic fluid port described in two respectively, when in unlatching working position, two institutes
State actuator port connection.
Can be using four-way reversing valve as switch valve, and two cut-off hydraulic fluid ports are set, to ensure its reliability opened and closed.
The present invention also provides a kind of hydraulic system of crane, including variable amplitude hydraulic system, telescopic arm hydraulic system and volume
Hydraulic system is raised, the variable amplitude hydraulic system, telescopic arm hydraulic system and hoisting hydraulic system are using described in any of the above-described
Pilot-operated type control valve hydraulic circuit is controlled.
Because the present invention includes the pilot-operated type control valve described in any of the above-described, therefore the pilot-operated type control described in any of the above-described
Technique effect produced by valve processed is applied to the hydraulic system of the present invention, and here is omitted.
Preferably, the main valve of the variable amplitude hydraulic system has two control ports that control luffing rises and falls respectively, only controls
The control port that luffing processed falls is connected by the switch with fuel tank；The main valve of the telescopic arm hydraulic system has to be controlled respectively
Two control ports of semi-girder and contracting arm, only control the control port of semi-girder to be connected by the switch with fuel tank；The elevator
The main valve of hydraulic system has two control ports that control elevator rises and falls respectively, only controls the control port of hoisting crane to pass through institute
Switch is stated to connect with fuel tank.
Fallen due to luffing, semi-girder and non-security direction that hoisting crane is crane job, when crane is in non-security direction
During work, easily because overload triggers security incident, therefore need to release guide oil in time when it overloads, prevent crane in non-peace
Omnirange continues operation, therefore switch can be set only in the guide's oil circuit in non-security direction, to accelerate unloading rate, prevents
Overload crane, improves the security performance of crane.
Preferably, control luffing falls control port, the control port of control semi-girder and the control port for controlling hoisting crane
Connected by a switch with fuel tank, and three is equipped with check valve.At this point it is possible to pass through the control three simultaneously of a switch
The off-load of individual control port, and because the setting of check valve enables to three control ports separate, it is to avoid luffing hydraulic pressure
System, telescopic arm hydraulic system and hoisting hydraulic system are interfered.
Brief description of the drawings
Fig. 1 is a kind of signal of set-up mode of pilot-operated type control valve that the hydraulic system of crane in the prior art is used
Figure；
Fig. 2 is a kind of schematic diagram of the hydraulic system of crane provided by the present invention in embodiment；
Fig. 3 is schematic diagram of the hydraulic system of crane provided by the present invention in another embodiment.
In Fig. 1：
1 ' first main valve, 2 ' second main valves, 3 ' the 3rd main valves, 4 ' first pilot valves, 5 ' second pilot valves, 6 ' the 3rd guides
Valve, 7 ' the 4th pilot valves, 8 ' the 5th pilot valves, 9 ' the 6th pilot valves
In Fig. 2-3：
1 main valve, 2 pilot valves, 21 first pilot valves, 22 second pilot valves, 3 switches, 4 check valves
Embodiment
The core of the present invention is to provide a kind of pilot-operated type control valve, it is possible to increase the unloading rate of guide oil, so as to quick
Off-load, is achieved effective control.
Another core of the present invention is to provide a kind of hydraulic system of crane, using above-mentioned pilot-operated type control valve to hydraulic pressure
Oil circuit is controlled, and to realize the quick relief of guide oil, and then improves the response speed of hydraulic circuit, it is to avoid crane surpasses
Carry, it is ensured that the security that crane is used.
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Fig. 2 is refer to, Fig. 2 is a kind of signal of the hydraulic system of crane provided by the present invention in embodiment
Figure.
The present invention provides a kind of hydraulic system of crane, and the hydraulic system includes variable amplitude hydraulic system, telescopic arm liquid
Pressure system and hoisting hydraulic system, and three uses pilot-operated type control valve to be controlled hydraulic circuit, to improve hydraulic oil
The response speed on road, prevents crane from continuing operation under the limiting conditions such as overload, it is ensured that the security of crane work.
Below in conjunction with accompanying drawing, by taking wherein variable amplitude hydraulic system as an example, the pilot-operated type control valve of the present invention is carried out specifically
It is bright.
In a kind of embodiment, pilot-operated type control valve of the invention includes main valve 1 and pilot valve 2, and main valve 1 has
Control port, pilot valve 2 can set guide's actuator port, and be connected with the control port of guide's actuator port and main valve 1
Lead to, and the oil inlet of pilot valve 2 is connected with oil pump, oil-out is connected with fuel tank.Pilot valve 2 has can mutually switch two
Working position, respectively the first working position and the second working position, when in the first working position, guide's actuator port connects with oil inlet
Logical, so that oil pump is connected by guide's actuator port of pilot valve 2 with the control port of main valve 1, the control port to main valve 1 is defeated
Hydraulic oil is sent, driving main valve 1 starts action；When in the second working position, guide's actuator port and the oil-out of pilot valve 2 connect
It is logical, so that the control port of main valve 1 be connected with fuel tank, it is discharged into fuel tank so as to the control oil of control port so that main valve 1 stops
Corresponding actions.
The pilot-operated type control valve of the present invention also includes switch 3, and the control port of main valve 1 is also connected by switch 3 with fuel tank,
As shown in Figure 2.When the control oil in main valve 1 needs off-load, pilot valve 2 is switched to the second working position, then the control of control port
Liquefaction can be connected by pilot valve 2 with fuel tank, to release control oil；At the same time, switch 3 is opened, and control port is by opening
Close 3 to connect with fuel tank, control oil can also be connected by switch 3 with fuel tank simultaneously, realize off-load.It can be seen that, guide of the invention
In formula control valve, the control port of main valve 1 has two off-load oil circuits, releases control oil so as to quick, improves the response of main valve 1
Speed, and then hydraulic circuit is accurately controlled, enable in particular to the hydraulic circuit in the non-security direction of fast shut-off, it is ensured that operation
Security.
Further, it is also possible to check valve 4 be set on the oil circuit that control port is connected by switch 3 with fuel tank, to prevent control
Influence of the pressure change of liquefaction mouthful to the off-load oil circuit, it is ensured that control oil is unidirectionally discharged into fuel tank.
Specifically, switch 3 can be controlled valve simple in construction, can be using manually, electrically or hydraulic-driven；Or
Person, switch 3 can be with the magnetic valve for opening and closing the two working positions, to improve keying reliability.
When switch 3 is set to magnetic valve, it is specifically as follows two-position four-way solenoid valve, including two cut-off hydraulic fluid ports and two
Actuator port；One of working position is opens working position, now two actuator ports connection, so as to by off-load oil communication,
Another working position is Operating In Persistent Current Mode position, and now two actuator ports are connected with two cut-off hydraulic fluid ports respectively, and magnetic valve is in and closed
Conjunction state, so as to off-load oil circuit be closed, as shown in Figure 2.
By taking variable amplitude hydraulic system as an example, main valve 1 is used to control the flexible of amplitude oil cylinder, and main valve 1 can include two controls
Hydraulic fluid port, i.e. the first control port and the second control port, wherein, the first control port is used to control luffing to fall, the second control oil
Mouth is used to control luffing to rise；Now, pilot valve 2 can include the first pilot valve 21 and the second pilot valve 22, the first pilot valve 21
Connected with the first control port, the second pilot valve 22 is connected with the second control port, two pilot valves are respectively provided with above-mentioned first work
Make position and the second working position, so that control bound 1 carries out luffing respectively and luffing falls.
When progress luffing falls to act, the first pilot valve 21 is switched to the first working position, so as to which oil pump and first are controlled
Hydraulic fluid port is connected, so as to control oil to the first control port conveying high-pressure so that main valve 1 is switched to left position, by oil inlet P and luffing
The actuator port connection fallen, driving crane carries out luffing and fallen；When carrying out luffing, the second pilot valve 22 is switched to the first work
Make position so that oil pump is connected with the second control port, oil controlled to the second control port conveying high-pressure, main valve 1 is switched to right position,
Oil inlet P is connected with the actuator port that luffing rises, crane carries out luffing and plays action.
It should be noted that, the different operating position of location discrimination valve in used herein accompanying drawing convenient for statement, not
It is understood that and has carried out any restriction for structure and/or function to valve.
Really as stated in the Background Art, the direction that luffing falls is the non-security direction that crane works, and therefore, it can only will control
The first control port that luffing processed falls is connected by switch 3 with fuel tank, so as to carry out carrying for it when luffing falls operation in crane
For two off-load oil circuits, as shown in Figure 2；It is of course also possible to which the second control port is connected by switch 3 with fuel tank, improve and become
Width plays the unloading rate of time control liquefaction.
Similarly, in telescopic arm hydraulic system and hoisting hydraulic system, main valve 1 can also set the first control port and
Two control ports, so that two control ports are respectively used to control semi-girder and contracting arm, or two control ports are respectively used to control
Hoisting crane and elevator processed fall；Because the operative orientation of semi-girder and hoisting crane is non-security direction, therefore can also be only in control semi-girder
Or the control port of hoisting crane sets switch 3, connected by switch 3 with fuel tank；Also or, each control port is by opening
3 are closed to connect with fuel tank.
Further, the hydraulic system of whole crane can only set a switch 3, and luffing is controlled by a switch 3
The control port of main valve 1 and the connected relation of fuel tank in hydraulic system, telescopic arm hydraulic system and hoisting hydraulic system；In detail
Ground, can be in the main valve 1 of variable amplitude hydraulic system, telescopic arm hydraulic system and hoisting hydraulic system, and each control port is equal
Check valve 4 is set, then again connected each control port with fuel tank by a switch 3.
Because check valve 4 ensure that control oil is irreversibly delivered to fuel tank, therefore the control oil of each control port will not phase
Mutually interference, it is ensured that the independence of each hydraulic system；Meanwhile, it can be realized using a switch 3 to each control port
Control, its is simple in construction, and it is more convenient to operate, and cost is relatively low.
Further, fallen due to luffing, the operative orientation of semi-girder and hoisting crane is non-security direction, therefore can be only in control
Control port, the control port of control semi-girder and the control port setting check valve 4, the i.e. luffing that control hoisting crane that luffing falls
The first control port of each main valve 1 is respectively provided with check valve in hydraulic system, telescopic arm hydraulic system and hoisting hydraulic system
4；Then by the way that these three control ports are connected by a switch 3 with fuel tank, as shown in Figure 2.Now, check valve 4 is not only
It can ensure that the control oil of control port is unidirectionally discharged into fuel tank, be also prevented from controlling the mutual of oil between each control port
Interference, it is ensured that the independence of each hydraulic system.
When using one switch 3 be controlled when, can will switch 3 with control crane complete luffing rise and fall, telescopic arm
And elevator such as rises and falls at the joystick connection of operation, will pass through the job state that joystick judges crane, so that
Crane will control oil discharge in time when being in extreme working position, especially can quickly stop crane in non-security direction
Operation, it is ensured that crane work security.
In addition, in the pilot-operated type control valve of the present invention, switch 3 can be separately provided in each control port, i.e., each control
Liquefaction mouth is correspondingly arranged a switch 3, is connected with realizing with the independent of fuel tank, then the off-load of each control port is separate,
Can be by controlling corresponding switch 3 to realize the independent off-load of some control port, the independence of system is stronger, using more
To be convenient.
It is appreciated that when setting switch 3 respectively in each control port, check valve 4 can be not provided with, now equally may be used
To ensure the independence between each off-load oil circuit, further to simplify the structure of pilot-operated type control valve.
Please further refer to Fig. 3, Fig. 3 is the hydraulic system of crane provided by the present invention in another embodiment
In schematic diagram.
In another embodiment, switch 3 can use zero leakage reversal valve, can also use electromagnetic drive,
To accelerate switching reliability, its reaction speed is improved, and then accelerate unloading rate.
Zero leakage reversal valve can be bi-bit bi-pass reversal valve, and with opening and two working positions of closure, when in opening
When opening working position, two actuator ports are interconnected, and when in Operating In Persistent Current Mode position, two actuator ports are ended by check valve,
I.e. two actuator ports are not connected.
As described above, in the pilot-operated type control valve of the present invention, pilot valve 2 can include the first pilot valve 21 and the second guide
Valve 22, the first pilot valve 21 is connected with the first control port of main valve 1, the second control port of the second pilot valve 22 and main valve 1
Connection；First pilot valve 21 and the second pilot valve 22 are respectively provided with two working positions, when in the first working position, guide's working oil
Mouth is connected with oil pump, and when in the second working position, guide's actuator port is connected with fuel tank；Can be by the first control of main valve 1
Hydraulic fluid port and the second control port are connected by switch 3, as shown in Figure 3.
In detail, because the first pilot valve 21 and the second pilot valve 22 are respectively provided with the second working position connected with fuel tank, when
When first control port needs off-load, the first pilot valve 21 is switched into the second working position, then the first control port passes through first
Pilot valve 21 is connected with fuel tank；Switch 3 is opened simultaneously, the first control port is connected with the second control port, due to the second control
Liquefaction mouthful is connected with the second pilot valve 2, and when the first pilot valve 21 is controlled to main valve 1, the second pilot valve 22 is located all the time
In the second working position, therefore during the unlatching of switch 3, the first control port is connected by the pilot valve 2 of switch 3 and second with fuel tank.Also
It is to say, the first control port now is connected by the first pilot valve 21 and the second pilot valve 22 with fuel tank respectively, forms two
Off-load oil circuit, to accelerate unloading rate.
Similarly,, can also if the second control port needs off-load when the second pilot valve 22 is controlled to main valve 1
Open switch 3 so that the second control port is connected by the first pilot valve 21 and the second pilot valve 22 with fuel tank respectively, form two
Bar off-load oil circuit, as shown in Figure 3.
Specifically, switch 3 can be above-mentioned zero leakage reversal valve, can use the structure of above-mentioned bi-bit bi-pass reversal valve,
Or use other switch valves.Obviously, when switching the structure that 3 use above-mentioned bi-bit bi-pass reversal valve, under closed mode, switch
3 two ends are ended by check valve, to block off-load oil circuit, it is to avoid guide's control of the first pilot valve 21 and the second pilot valve 22
Liquefaction road is interfered, its fast response time, can realize zero leakage, with higher switching reliability.
Under normal circumstances, pilot valve 2 can use electric proportional valve, therefore switch 3 can be set into solenoid directional control valve, its phase
Answer speed faster than electric proportional valve, opened with quick by the off-load oil circuit of the control of switch 3, so as to ensure that the rapid of control oil is unloaded
Lotus so that violation risky operation stops in time, it is ensured that the security of crane operation.
In crane normal operation, it can cause switch 3 must not electricity, the off-load oil circuit being controlled by it with closing, main valve 1
The normal operation under the control of pilot valve 2；When needing off-load so that switch 3 obtains electric, control off-load oil circuit is opened, and at this
Check valve is set on off-load oil circuit, and then variable amplitude hydraulic system, telescopic arm hydraulic system and hoisting hydraulic system are spaced from each other,
Avoid interfering between each hydraulic circuit.
The pilot-operated type control valve of the present invention, the paralleling switch 3 between main valve 1 and pilot valve 2, to be controlled by switch 3
The off-load of oil adds a unloading channel, and then accelerates unloading rate, improves the response speed of main valve 1, has been particularly suitable for use in
The hydraulic system of heavy-duty machine, is capable of the operation in the dangerous direction of Quick stop crane, it is ensured that the security that crane is used.
It should be noted that the hydraulic system of crane is complex, the elder generation being only controlled herein to its hydraulic circuit
Conduction control valve is illustrated, and other parts refer to prior art, and here is omitted.
The hydraulic system and its pilot-operated type control valve to crane provided by the present invention are described in detail above.This
Apply specific case in text to be set forth the principle and embodiment of the present invention, the explanation of above example is only intended to
Help to understand core concept of the invention.It should be pointed out that for those skilled in the art, not departing from this
On the premise of inventive principle, some improvement and modification can also be carried out to the present invention, these are improved and modification also falls into the present invention
In scope of the claims.
Claims (6)
1. a kind of pilot-operated type control valve, including main valve (1) and the pilot valve connected with the control port with control port
(2), the pilot valve (2) has the first working position for connect control port with oil pump and by the control port and oily
Second working position of case connection, it is characterised in that the control port of the main valve (1) is also connected by switching (3) with fuel tank；When
When the pilot valve (2) switches to second working position, the switch (3) is opened, so as to which the control of the main valve (1) is oily
Mouth is connected with fuel tank；The control port includes the first control port and the second control port, and the pilot valve (2) includes and institute
The second pilot valve (22) stated the first pilot valve (21) of the first control port connection and connected with second control port, institute
State the first pilot valve (21) and second pilot valve (22) is respectively provided with first working position and second working position, it is described
First control port is connected with second control port by the switch (3)；First pilot valve (21) and described
When one of which in two pilot valves (22) switches to second working position, another one is also at second working position, with
So that any one of first control port and second control port, respectively by first pilot valve (21) and
Second pilot valve (22) connects with fuel tank, forms two off-load oil circuits.
2. pilot-operated type control valve as claimed in claim 1, it is characterised in that the switch (3) is with unlatching and closure two
The magnetic valve of individual working position.
3. pilot-operated type control valve as claimed in claim 2, it is characterised in that the magnetic valve is zero leakage reversal valve.
4. pilot-operated type control valve as claimed in claim 3, it is characterised in that the zero leakage reversal valve commutates for bi-bit bi-pass
Valve, when in Operating In Persistent Current Mode position, two actuator port is ended by check valve；When in unlatching working position, two work
Make hydraulic fluid port connection.
5. pilot-operated type control valve as claimed in claim 3, it is characterised in that the magnetic valve is two-position four way change valve, bag
Two cut-off hydraulic fluid ports and two actuator ports are included, when in Operating In Persistent Current Mode position, actuator port described in two described in two respectively with cutting
Only hydraulic fluid port is connected, and when in unlatching working position, actuator port described in two is connected.
6. a kind of hydraulic system of crane, including variable amplitude hydraulic system, telescopic arm hydraulic system and hoisting hydraulic system, it is special
Levy and be, the variable amplitude hydraulic system, telescopic arm hydraulic system and hoisting hydraulic system are any using the claims 1-5
Pilot-operated type control valve described in is controlled to hydraulic circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410371672.3A CN104088830B (en) | 2014-07-30 | 2014-07-30 | The hydraulic system and its pilot-operated type control valve of a kind of crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410371672.3A CN104088830B (en) | 2014-07-30 | 2014-07-30 | The hydraulic system and its pilot-operated type control valve of a kind of crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104088830A CN104088830A (en) | 2014-10-08 |
| CN104088830B true CN104088830B (en) | 2017-09-19 |
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Family Applications (1)
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| CN104373404B (en) * | 2014-11-24 | 2016-12-07 | 徐州重型机械有限公司 | The control system of composite move and method and crane |
| BR112017008921B1 (en) * | 2014-10-30 | 2022-05-31 | Xuzhou Heavy Machinery Co., Ltd | Crane hydraulic system and system control method |
| CN104500470B (en) * | 2014-12-04 | 2017-09-29 | 徐州徐工挖掘机械有限公司 | A kind of hydraulic system for having a valve dual-purpose |
| CN105650048B (en) * | 2016-03-04 | 2018-09-18 | 柳州柳工液压件有限公司 | Pilot control valve group |
| CN106382271B (en) * | 2016-10-18 | 2017-12-26 | 浙江大学 | The double spool PLC technology hydraulic valve and its method of a kind of high-speed switch valve pilot control |
| CN112096675B (en) * | 2019-09-26 | 2022-10-04 | 上海圣克赛斯液压股份有限公司 | Hydraulic control system of coke guide |
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| CN201738368U (en) * | 2010-04-14 | 2011-02-09 | 福田雷沃国际重工股份有限公司 | Hydraulic damping control loop of excavator |
| CN102788052A (en) * | 2012-07-27 | 2012-11-21 | 柳工常州挖掘机有限公司 | Oil changing and buffering device and pilot hydraulic control system with same |
| CN103061379B (en) * | 2012-12-28 | 2015-07-08 | 三一重机有限公司 | Hydraulic pressure assembly and excavator |
| CN203175567U (en) * | 2013-01-06 | 2013-09-04 | 浙江大学 | Energy-saving type shield segment assembling positioning electrohydraulic control system adopting load-sensitive technology |
| CN203080567U (en) * | 2013-01-07 | 2013-07-24 | 徐工集团工程机械股份有限公司科技分公司 | Pilot control hydraulic locking system of loader |
| CN204003694U (en) * | 2014-07-30 | 2014-12-10 | 徐州重型机械有限公司 | A kind of hydraulic system of hoist and pilot-operated type control valve thereof |
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