CN103465955A - Hydraulic control valve bank for locking steering shaft of crane, steering system and crane - Google Patents
Hydraulic control valve bank for locking steering shaft of crane, steering system and crane Download PDFInfo
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- CN103465955A CN103465955A CN2013104381794A CN201310438179A CN103465955A CN 103465955 A CN103465955 A CN 103465955A CN 2013104381794 A CN2013104381794 A CN 2013104381794A CN 201310438179 A CN201310438179 A CN 201310438179A CN 103465955 A CN103465955 A CN 103465955A
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Abstract
The invention relates to a hydraulic control valve bank for locking a steering shaft of a crane, a steering system and the crane. The hydraulic control valve bank is provided with an oil inlet and an oil return port and comprises a first electromagnetic reversing valve, a second electromagnetic reversing valve, a pressure maintaining overflow valve and a pressure sensor; the oil inlet of the hydraulic control valve bank is connected with oil inlets of the first electromagnetic reversing valve and the pressure maintaining overflow valve; the oil return port of the hydraulic control valve bank is connected with an oil return port of the first electromagnetic reversing valve; the oil return port of the hydraulic control valve bank is also used for being connected with a middle cavity of a locking oil cylinder of the steering shaft of the crane; an oil outlet of the first electromagnetic reversing valve is connected with an oil inlet of the second electromagnetic reversing valve; an oil outlet of the second electromagnetic reversing valve is used for being communicated with a left cavity and a right cavity of the locking oil cylinder of the steering shaft of the crane; and the pressure sensor is arranged at the oil inlet or the oil outlet of the second electromagnetic reversing valve. The hydraulic control valve bank is convenient to install, is safe and reliable to use and can implement an effect of effectively controlling to lock a steering wheel and relieve locking for the steering wheel under the steering condition of a multi-shaft crane.
Description
Technical field
The present invention relates to a kind of engineering machinery field, relate in particular to the locking of a kind of hoisting crane steering shaft the fluid control valve group, be provided with steering swivel system and the hoisting crane of the fluid control valve group of this hoisting crane steering shaft locking.
Background technology
At present, multi-shaft crane, in steering procedure, generally has a plurality of axles to participate in turning to, or even four-wheel steering.For taking into account safety and alerting ability, the multi-axle steering hoisting crane is generally by trailing wheel being locked and participation turns to control.In order to solve the problem of existing hoisting crane steering swivel system difficult arrangement.Bring the performances such as safety, comfort feature and maneuverability of driving to the user simultaneously.When high vehicle speeds, particularly in the situation that dodge and urgent doubling, system is to rear axle locking initiatively, to improve the safety and stability of Vehicle Driving Cycle; When low vehicle speeds, system is carried out the active release to rear axle, to improve the alerting ability of Vehicular turn.
Shown in Fig. 1 is a kind of structural representation of multi-shaft crane steering swivel system.As shown in Figure 1, this multi-shaft crane steering swivel system comprises steering shaft 1 ', the wheel flutter that is connected with steering shaft 1 ' 2 ' and wheel pivoted arm 3 ', steering jack 4 ', controls the blocking device that turns to oil circuit 5 ' and restriction wheel flutter 2 ' to turn to of steering jack 4 '.Blocking device wherein comprises hydraulic pressure meta locked cylinder 6 ' and controls in locked cylinder 6 ' the liquid disconnected control cock 7 ' that circulates, and an end of locked cylinder 6 ' is connected with steering shaft 1 ', and an other end is connected with wheel pivoted arm 3 '.Control cock 7 ' has the first hydraulic fluid port A ', the second hydraulic fluid port B ' and the 3rd hydraulic fluid port C ', with the Hydraulic Pump (not shown), is connected.
When blocking device is in the lock state, control cock 7 ' is closed, the high pressure fuel source that the first hydraulic fluid port A ', the second hydraulic fluid port B ' and the 3rd hydraulic fluid port C ' provide by Hydraulic Pump is sealed, hydraulic oil in locked cylinder 6 ' does not flow, its piston can not move, piston rod is not done fore and aft motion, and the entire length of locked cylinder 6 ' will remain unchanged.Because locked cylinder 6 ' one end is connected with steering shaft 1 ', the other end is connected with wheel pivoted arm 3 ', length distance between two point of connection does not change yet, therefore wheel pivoted arm 3 ' can not rotate with respect to steering shaft 1 ', angle between steering shaft 1 ' and wheel flutter 2 ' remains unchanged, and now, wheel flutter 2 ' is locked, can not freely rotate to both sides, whole blocking device plays the push-and-pull rod effect.The locked state in not turning to of steering shaft 1 ' now.
When needs unlock, control cock 7 ' is opened, and the first hydraulic fluid port A ', the second hydraulic fluid port B ' and the 3rd hydraulic fluid port C ' communicate with oil return line, and whole blocking device becomes rods.Turn to oil circuit 5 ' to provide high pressure oil in steering jack 4 ', angle between wheel flutter 2 ' and steering shaft 1 ' changes, now locked cylinder 6 ' is in being disengaged the state of locking, the length of locked cylinder 6 ' can be promoted to stretch out and to shorten by wheel pivoted arm 3 ', steering shaft 1 ' is diverted power-assisted oil cylinder 4 ' and promotes, thereby realizes the turning function of steering shaft.
Shown in Fig. 2 is the another kind of structural representation of multi-shaft crane steering swivel system.As shown in Figure 2, identical with the multi-shaft crane steering swivel system shown in Fig. 1, the blocking device that the wheel flutter 2 ' that also comprise steering shaft 1 ', with steering shaft 1 ', is connected and wheel pivoted arm 3 ', steering jack 4 ' and restriction wheel flutter 2 ' turn to.Blocking device comprises locked cylinder 6 ' and fluid control valve group 8 ', and this fluid control valve group 8 ' mainly realizes locking and remove two kinds of functions of locking, there is zero leakage during locking and remove locking fast, characteristics smoothly.
Fluid control valve group 8 ' is comprised of check valve 81 ' and overflow pressure retaining valve 82 ', when vehicle in the low speed driving process, now the N mouth of fluid control valve group 8 ' communicates with oil return line, the X mouth of fluid control valve group 8 ' communicates with high pressure fuel source, check valve 81 ' is in the two-way admittance state, locked cylinder 6 ' is in released state, and steering shaft 1 ' can be realized turning to.In vehicle is being run at high speed process, the high pressure fuel source that now the N mouth of fluid control valve group provides with Hydraulic Pump communicates, the X mouth of fluid control valve group 8 ' communicates with oil return line, the piston two ends of locked cylinder 6 ' are in the high pressure packing state, its force value is that overflow pressure retaining valve 82 ' provides, locked cylinder 6 ' is in lockup state, the steering shaft 1 ' locking of realizing in stays.
Fluid control valve group 8 ' in control cock in Fig. 17 ' and Fig. 2 is in use procedure Shortcomings part: under lockup state, for making locked cylinder 6 ' keep rigid state, by Hydraulic Pump, constantly constantly pressurizeed in piston two chambeies of locked cylinder 6 ', now locked cylinder 6 ' is all the time in the high pressure overflow situation, and this dynamic locking mode will certainly be brought following three point problem:
1, hydraulic efficiency pressure system is always in the high pressure overflow situation, the system persistent fever, and temperature rise is constantly risen.
2, hydraulic efficiency pressure system efficiency certainly will descend comparatively fast.
3,, due to high pressurized overflow long-term existence, also can bring harmful effect for the various Hydraulic Elements life-span.
Summary of the invention
The objective of the invention is to propose a kind of fluid control valve group, steering swivel system and hoisting crane of hoisting crane steering shaft locking, the problem of system heating, decrease in efficiency and poor stability that it can avoid long-time high pressurized overflow to produce, effectively control the locking of wheel flutter and unlock.
For achieving the above object, the invention provides following technical scheme:
A kind of fluid control valve group of hoisting crane steering shaft locking, have oil inlet (P) and return opening (T); It comprises the first solenoid directional control valve, the second solenoid directional control valve, holding overflow valve and pressure sensor, and wherein: the oil inlet of described fluid control valve group (P) is connected with the oil inlet of described the first solenoid directional control valve and holding overflow valve; The return opening of described fluid control valve group (T) is connected with the return opening of described the first solenoid directional control valve; The return opening of described fluid control valve group (T) also is connected for the intermediate cavity with hoisting crane steering shaft locked cylinder; The oil outlet of described the first solenoid directional control valve is connected with the oil inlet of described the second solenoid directional control valve; The oil outlet of described the second solenoid directional control valve is for being connected with the He You chamber, left chamber of hoisting crane steering shaft locked cylinder; Described pressure sensor is arranged on oil inlet or the oil outlet of described the second solenoid directional control valve.
Further, described the first solenoid directional control valve and the second solenoid directional control valve all obtain under electric state, the road hydraulic oil entered from the oil inlet (P) of described fluid control valve group enters described the first solenoid directional control valve, the second solenoid directional control valve successively, and flows out from described the second solenoid directional control valve; Another road hydraulic oil entered from the oil inlet (P) of described fluid control valve group flows into described holding overflow valve; When the force value detected when described pressure sensor reaches preset pressure value, described the first solenoid directional control valve and the second solenoid directional control valve be simultaneously in power failure state, the oil inlet of described the second solenoid directional control valve and oil outlet all with extraneous oil circuit disconnection.
Further, described the first solenoid directional control valve continues to keep power failure state and described the second solenoid directional control valve in obtaining electricity condition, and the oil inlet of described the second solenoid directional control valve is connected with the return opening (T) of described fluid control valve group by described the first solenoid directional control valve.
Further, described the first solenoid directional control valve is two-position three-way valve.
Further, described the second solenoid directional control valve is the 2/2-way valve.
The present invention also provides a kind of steering swivel system, comprise the blocking device that steering shaft, the wheel flutter be connected with steering shaft and wheel pivoted arm, steering jack and restriction wheel flutter turn to, wherein: described blocking device comprises hoisting crane steering shaft locked cylinder and controls in described hoisting crane steering shaft locked cylinder the liquid disconnected control cock that circulates; One end of described hoisting crane steering shaft locked cylinder is connected with described steering shaft, and an other end is connected with described wheel pivoted arm; Described hoisting crane steering shaft locked cylinder has the first hydraulic fluid port, the second hydraulic fluid port and the 3rd hydraulic fluid port; Described the first hydraulic fluid port is connected with the left chamber of described hoisting crane steering shaft locked cylinder; Described the second hydraulic fluid port is connected with described hoisting crane steering shaft locked cylinder lumen; Described the 3rd hydraulic fluid port is connected with the right chamber of described hoisting crane steering shaft locked cylinder; The fluid control valve group that described control cock is the hoisting crane steering shaft locking in the various embodiments described above; The oil outlet of the second solenoid directional control valve in the fluid control valve group of described hoisting crane steering shaft locking is connected with described the first hydraulic fluid port and the 3rd hydraulic fluid port simultaneously; The return opening of described fluid control valve group (T) is connected with described the second hydraulic fluid port.
Further, before described steering shaft enters lock-out state, the first solenoid directional control valve in the fluid control valve group of described hoisting crane steering shaft locking and the second solenoid directional control valve simultaneously electric, the road hydraulic oil entered from described oil inlet (P) enters the He You chamber, left chamber of described hoisting crane steering shaft locked cylinder successively simultaneously via described the first solenoid directional control valve and the second solenoid directional control valve; The holding overflow valve of another road hydraulic oil entered from described oil inlet (P) through the fluid control valve group of described hoisting crane steering shaft locking flows into the intermediate cavity of hoisting crane steering shaft locked cylinder; When the force value that the pressure sensor in the fluid control valve group of described hoisting crane steering shaft locking detects reaches preset pressure value, described the first solenoid directional control valve and the second solenoid directional control valve be dead electricity simultaneously, the hydraulic oil in the He You chamber, left chamber of described hoisting crane steering shaft locked cylinder is by described the second electromagnetic valve sealing, and described steering shaft enters lock-out state.
Further, when described steering shaft needs release, described the first solenoid directional control valve must not be electric, described the second solenoid directional control valve obtains electric, and the He You chamber, left chamber of described hoisting crane steering shaft locked cylinder all is connected with the return opening (T) of described fluid control valve group by described the first solenoid directional control valve and the second solenoid directional control valve successively.
The present invention also provides a kind of hoisting crane, and it comprises the steering swivel system in the various embodiments described above.
Arbitrary technical scheme based in technique scheme, the embodiment of the present invention at least can produce following technique effect:
Because the present invention is provided with the first solenoid directional control valve, the second solenoid directional control valve, holding overflow valve and pressure sensor, the oil inlet of fluid control valve group is connected with the oil inlet of the first solenoid directional control valve and holding overflow valve, the return opening of fluid control valve group is connected with the return opening of the first solenoid directional control valve, the oil outlet of the first solenoid directional control valve is connected with the oil inlet of the second solenoid directional control valve, pressure sensor is arranged on oil inlet or the oil outlet of described the second solenoid directional control valve, when the oil pressure value of the oil inlet of the second solenoid directional control valve or oil outlet reaches default pressure size, the oil inlet of the second solenoid directional control valve and oil outlet all disconnect with extraneous oil circuit and can't oil-feed and fuel-displaced, and realize the state of the pressurize of a static state, and in prior art, turn to the control cock used in system when steering shaft is in the lock state, utilize Hydraulic Pump by the hydraulic oil of the past hoisting crane steering shaft locked cylinder conveying high-pressure of control cock always, make hoisting crane steering shaft locked cylinder in a dynamic high pressure overflow situation, if continue for a long time this dynamic high pressure overflow situation, will inevitably cause the terminal of hydraulic oil pumping, it is the heating of hoisting crane steering shaft locked cylinder, thereby the problem that decrease in efficiency and poor stability occur, therefore the system heating that the packing state of static state of the present invention can avoid long-time high pressurized overflow to produce, the problem of decrease in efficiency and poor stability, effectively control the locking of wheel flutter and unlock, use safer, reliably, and easy for installation.
The accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining.In the accompanying drawings:
A kind of structural representation that Fig. 1 is multi-shaft crane steering swivel system in prior art;
The another kind of structural representation that Fig. 2 is multi-shaft crane steering swivel system in prior art;
Fig. 3 is the structural representation that turns to an embodiment of system in the present invention.
The specific embodiment
For making purpose of the invention process, technical scheme and advantage clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label means same or similar element or the element with identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, rather than whole embodiment.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.Embodiment based in the present invention, those of ordinary skills are not making under the creative work prerequisite the every other embodiment obtained, and all belong to the scope of protection of the invention and below in conjunction with accompanying drawing, embodiments of the invention are elaborated.
In description of the invention, it will be appreciated that, term " " center ", " vertically ", " laterally ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limiting the scope of the invention.
As shown in Figure 3, the fluid control valve group of hoisting crane steering shaft locking provided by the present invention has oil inlet P and oil return inlet T, and oil inlet P is connected with the Hydraulic Pump (not shown), and oil return inlet T is connected with the fuel tank (not shown).The fluid control valve group of hoisting crane steering shaft locking comprises the first solenoid directional control valve 1, the second solenoid directional control valve 2, holding overflow valve 3 and pressure sensor (not shown), wherein: the oil inlet P of fluid control valve group is connected with the oil inlet of holding overflow valve 3 with the first solenoid directional control valve 1, and the oil inlet P hydraulic oil by the fluid control valve group can enter the first solenoid directional control valve 1 and holding overflow valve 3 simultaneously.
The oil return inlet T of fluid control valve group is connected with the return opening of the first solenoid directional control valve 1, and the oil return inlet T of fluid control valve group also is connected for the intermediate cavity with hoisting crane steering shaft locked cylinder.The oil outlet of the first solenoid directional control valve 1 is connected with the oil inlet of the second solenoid directional control valve 2, and the oil outlet of the second solenoid directional control valve 2 is for being connected with the He You chamber, left chamber of hoisting crane steering shaft locked cylinder.
Pressure sensor can be arranged on the oil inlet (the M point in Fig. 3) of the second solenoid directional control valve 2, also can be arranged on the oil outlet (the M1 point in Fig. 3) of the second solenoid directional control valve 2, for measuring the oil pressure size of its position.
When the first solenoid directional control valve 1 and the second solenoid directional control valve 2 all obtain in electric situation, the road hydraulic oil entered from the oil inlet P of fluid control valve group enters the first solenoid directional control valve 1, then enters the second solenoid directional control valve 2, and flows out from the second solenoid directional control valve 2; Another road hydraulic oil entered from the oil inlet P of fluid control valve group flows into holding overflow valve 3, by holding overflow valve 3, carries out pressurize.Before this situation is applicable to the hoisting crane steering shaft and enters lock-out state, prepare the state of locking.
When the force value detected when pressure sensor reaches preset pressure value, the first solenoid directional control valve 1 and the second solenoid directional control valve 2 be dead electricity simultaneously, now, the oil inlet of the second solenoid directional control valve 2 and oil outlet all disconnect with extraneous oil circuit, that is to say, the not oil-feed of oil inlet of the second solenoid directional control valve 2, oil outlet also can't be fuel-displaced.This situation is applicable to the state that the hoisting crane steering shaft enters locking.
State based on the first solenoid directional control valve 1 and the second 2 while of solenoid directional control valve dead electricity, the first solenoid directional control valve 1 continues to keep power failure state, the second solenoid directional control valve 2 obtains electric, now, the oil inlet of the second solenoid directional control valve 2 and oil outlet all are communicated with extraneous oil circuit, and the oil inlet of the second solenoid directional control valve 2 is connected with the oil return inlet T of fluid control valve group by the first solenoid directional control valve 1.This kind of situation is applicable to the state that needs the hoisting crane steering shaft to unlock.
Hence one can see that, the fluid control valve group that adopts hoisting crane steering shaft provided by the present invention to lock can be for carrying out locking and release to hoisting crane steering shaft locked cylinder, due to when the oil pressure value of the oil inlet at the second solenoid directional control valve 2 (the M point in Fig. 3) or oil outlet reaches default pressure size, the oil inlet of the second solenoid directional control valve 2 and oil outlet all disconnect with extraneous oil circuit and can't oil-feed and fuel-displaced, and realize the state of the pressurize of a static state.In prior art, turn to the control cock used in system when steering shaft is in the lock state, utilize Hydraulic Pump by the hydraulic oil of the past hoisting crane steering shaft locked cylinder conveying high-pressure of control cock always, make hoisting crane steering shaft locked cylinder in a dynamic high pressure overflow situation, if continue for a long time this dynamic high pressure overflow situation, will inevitably cause the terminal of hydraulic oil pumping, be the heating of hoisting crane steering shaft locked cylinder, thereby the problem of decrease in efficiency and poor stability occurs.In sum, the problem of system heating, decrease in efficiency and poor stability that the packing state of static state of the present invention can avoid long-time high pressurized overflow to produce, the locking of effectively controlling wheel flutter with unlock, use safer, reliable, and easy for installation.
In above-described embodiment, what the first solenoid directional control valve 1 adopted is two-position three-way valve, and what the second solenoid directional control valve 2 adopted is the 2/2-way valve.
The present invention also provides a kind of steering swivel system, comprise the blocking device that steering shaft 4, the wheel flutter 5 be connected with steering shaft 4 and wheel pivoted arm 6, steering jack 7 and restriction wheel flutter 5 turn to, wherein: described blocking device comprises hoisting crane steering shaft locked cylinder 8 and controls in hoisting crane steering shaft locked cylinder 8 the liquid disconnected control cock that circulates.One end and the steering shaft 4 of hoisting crane steering shaft locked cylinder 8 are hinged, and an other end and wheel pivoted arm 6 are hinged.
Hoisting crane steering shaft locked cylinder 8 has the first hydraulic fluid port 9, the second hydraulic fluid port 10 and the 3rd hydraulic fluid port 11, and, the first hydraulic fluid port 9 is connected with hoisting crane steering shaft locked cylinder 8 left chambeies, the second hydraulic fluid port 10 is connected with hoisting crane steering shaft locked cylinder 8 lumens, and the 3rd hydraulic fluid port 11 is connected with hoisting crane steering shaft locked cylinder 8 right chambeies.
The fluid control valve group that described control cock is the hoisting crane steering shaft locking in the various embodiments described above.The oil outlet of the second solenoid directional control valve 2 in the fluid control valve group of described hoisting crane steering shaft locking is connected with the first hydraulic fluid port 9 and the 3rd hydraulic fluid port 11 simultaneously, and the oil return inlet T of described fluid control valve group is connected with the second hydraulic fluid port 10.
In hoisting crane is being run at high speed process, steering shaft 4 need to be in the time of lockup state, before steering shaft 4 enters lock-out state, the first solenoid directional control valve 1 in the fluid control valve group of described hoisting crane steering shaft locking and the second solenoid directional control valve 2 simultaneously electric, the road hydraulic oil that the oil inlet P of the fluid control valve group locked from described hoisting crane steering shaft enters enters the He You chamber, left chamber of hoisting crane steering shaft locked cylinder 8 successively simultaneously via the first solenoid directional control valve 1 and the second solenoid directional control valve 2; The intermediate cavity that the holding overflow valve 3 of another road hydraulic oil that the oil inlet P of the fluid control valve group locked from described hoisting crane steering shaft enters through the fluid control valve group of described hoisting crane steering shaft locking enters hoisting crane steering shaft locked cylinder.When the force value that the pressure sensor in the fluid control valve group of described hoisting crane steering shaft locking detects reaches preset pressure value, the first solenoid directional control valve 1 and the second solenoid directional control valve 2 be dead electricity simultaneously, the hydraulic oil in the He You chamber, left chamber of described hoisting crane steering shaft locked cylinder 8 is by the second electromagnetic valve 2 sealings, now, hydraulic oil in hoisting crane steering shaft locked cylinder 8 does not flow, its piston can not move, piston rod is not done fore and aft motion, and the entire length of hoisting crane steering shaft locked cylinder 8 will remain unchanged.Because hoisting crane steering shaft locked cylinder 8 one ends are connected with steering shaft 4, the other end is connected with wheel pivoted arm 6, length distance between two point of connection does not change yet, therefore wheel pivoted arm 6 can not rotate with respect to steering shaft 4, angle between steering shaft 4 and wheel flutter 5 remains unchanged, and now, wheel flutter 5 is locked, can not freely rotate to both sides, whole hoisting crane steering shaft locked cylinder 8 plays the push-and-pull rod effect.The locked state in not turning to of steering shaft 4 now.
When hoisting crane in the low speed driving process, when steering shaft 4 needs release, the first solenoid directional control valve 1 must not be electric, the second solenoid directional control valve 2 obtains electric, the He You chamber, left chamber of hoisting crane steering shaft locked cylinder 8 all is connected with the oil return inlet T of described fluid control valve group by the first solenoid directional control valve 1 and the second solenoid directional control valve 2 successively, and whole hoisting crane steering shaft locked cylinder 8 becomes rods.Turn to the oil circuit (not shown) to provide high pressure oil in steering jack 7, angle between wheel flutter 5 and steering shaft 4 changes, now hoisting crane steering shaft locked cylinder 8 is in being disengaged the state of locking, the length of hoisting crane steering shaft locked cylinder 8 can be promoted to stretch out and to shorten by wheel pivoted arm 6, steering shaft 4 is diverted power-assisted oil cylinder 7 and promotes, thereby realizes the turning function of steering shaft 4.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (9)
1. the fluid control valve group of hoisting crane steering shaft locking,
There is oil inlet (P) and return opening (T);
It is characterized in that:
Comprise the first solenoid directional control valve, the second solenoid directional control valve, holding overflow valve and pressure sensor, wherein:
The oil inlet of described fluid control valve group (P) is connected with the oil inlet of described the first solenoid directional control valve and holding overflow valve;
The return opening of described fluid control valve group (T) is connected with the return opening of described the first solenoid directional control valve;
The return opening of described fluid control valve group (T) also is connected for the intermediate cavity with hoisting crane steering shaft locked cylinder;
The oil outlet of described the first solenoid directional control valve is connected with the oil inlet of described the second solenoid directional control valve;
The oil outlet of described the second solenoid directional control valve is for being connected with the He You chamber, left chamber of hoisting crane steering shaft locked cylinder;
Described pressure sensor is arranged on oil inlet or the oil outlet of described the second solenoid directional control valve.
2. the fluid control valve group that hoisting crane steering shaft as claimed in claim 1 locks,
It is characterized in that:
Described the first solenoid directional control valve and the second solenoid directional control valve all obtain under electric state, the road hydraulic oil entered from the oil inlet (P) of described fluid control valve group enters described the first solenoid directional control valve, the second solenoid directional control valve successively, and flows out from described the second solenoid directional control valve;
Another road hydraulic oil entered from the oil inlet (P) of described fluid control valve group flows into described holding overflow valve;
When the force value detected when described pressure sensor reaches preset pressure value, described the first solenoid directional control valve and the second solenoid directional control valve be simultaneously in power failure state, the oil inlet of described the second solenoid directional control valve and oil outlet all with extraneous oil circuit disconnection.
3. the fluid control valve group that hoisting crane steering shaft as claimed in claim 2 locks,
It is characterized in that:
Described the first solenoid directional control valve continues to keep power failure state and described the second solenoid directional control valve in obtaining electricity condition, and the oil inlet of described the second solenoid directional control valve is connected with the return opening (T) of described fluid control valve group by described the first solenoid directional control valve.
4. the fluid control valve group that hoisting crane steering shaft as claimed in claim 3 locks,
It is characterized in that:
Described the first solenoid directional control valve is two-position three-way valve.
5. the fluid control valve group that hoisting crane steering shaft as claimed in claim 3 locks,
It is characterized in that:
Described the second solenoid directional control valve is the 2/2-way valve.
6. a steering swivel system,
Comprise the blocking device that steering shaft, the wheel flutter be connected with steering shaft and wheel pivoted arm, steering jack and restriction wheel flutter turn to, wherein:
Described blocking device comprises hoisting crane steering shaft locked cylinder and controls in described hoisting crane steering shaft locked cylinder the liquid disconnected control cock that circulates;
One end of described hoisting crane steering shaft locked cylinder is connected with described steering shaft, and an other end is connected with described wheel pivoted arm;
Described hoisting crane steering shaft locked cylinder has the first hydraulic fluid port, the second hydraulic fluid port and the 3rd hydraulic fluid port;
Described the first hydraulic fluid port is connected with the left chamber of described hoisting crane steering shaft locked cylinder;
Described the second hydraulic fluid port is connected with described hoisting crane steering shaft locked cylinder lumen;
Described the 3rd hydraulic fluid port is connected with the right chamber of described hoisting crane steering shaft locked cylinder;
It is characterized in that:
The fluid control valve group that described control cock is hoisting crane steering shaft locking as described as any one in claim 1-5;
The oil outlet of the second solenoid directional control valve in the fluid control valve group of described hoisting crane steering shaft locking is connected with described the first hydraulic fluid port and the 3rd hydraulic fluid port simultaneously;
The return opening of described fluid control valve group (T) is connected with described the second hydraulic fluid port.
7. steering swivel system as claimed in claim 6,
It is characterized in that:
Before described steering shaft enters lock-out state, the first solenoid directional control valve in the fluid control valve group of described hoisting crane steering shaft locking and the second solenoid directional control valve simultaneously electric, the road hydraulic oil entered from described oil inlet (P) enters the He You chamber, left chamber of described hoisting crane steering shaft locked cylinder successively simultaneously via described the first solenoid directional control valve and the second solenoid directional control valve; The holding overflow valve of another road hydraulic oil entered from described oil inlet (P) through the fluid control valve group of described hoisting crane steering shaft locking flows into the intermediate cavity of hoisting crane steering shaft locked cylinder;
When the force value that the pressure sensor in the fluid control valve group of described hoisting crane steering shaft locking detects reaches preset pressure value, described the first solenoid directional control valve and the second solenoid directional control valve be dead electricity simultaneously, the hydraulic oil in the He You chamber, left chamber of described hoisting crane steering shaft locked cylinder is by described the second electromagnetic valve sealing, and described steering shaft enters lock-out state.
8. steering swivel system as claimed in claim 7,
It is characterized in that:
When described steering shaft needs release, described the first solenoid directional control valve must not be electric, described the second solenoid directional control valve obtains electric, and the He You chamber, left chamber of described hoisting crane steering shaft locked cylinder all is connected with the return opening (T) of described fluid control valve group by described the first solenoid directional control valve and the second solenoid directional control valve successively.
9. a hoisting crane,
It is characterized in that:
Comprise steering swivel system as described as any one in claim 6-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104381794A CN103465955A (en) | 2013-09-24 | 2013-09-24 | Hydraulic control valve bank for locking steering shaft of crane, steering system and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104381794A CN103465955A (en) | 2013-09-24 | 2013-09-24 | Hydraulic control valve bank for locking steering shaft of crane, steering system and crane |
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| CN103465955A true CN103465955A (en) | 2013-12-25 |
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| CN2013104381794A Pending CN103465955A (en) | 2013-09-24 | 2013-09-24 | Hydraulic control valve bank for locking steering shaft of crane, steering system and crane |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105539573A (en) * | 2015-12-07 | 2016-05-04 | 三一汽车起重机械有限公司 | Steering active returning system and method for all-terrain crane |
| CN108482702A (en) * | 2018-04-03 | 2018-09-04 | 美迪斯智能装备有限公司 | A kind of air-bridge travel driving system |
| CN110466600A (en) * | 2019-08-22 | 2019-11-19 | 徐州重型机械有限公司 | A kind of control valve group, control valve, steering system and crane |
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| CN114789752B (en) * | 2022-04-29 | 2024-06-04 | 徐工集团工程机械股份有限公司 | Hydraulic steering system of unmanned aerial vehicle and unmanned aerial vehicle |
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Application publication date: 20131225 |