CN103057526B - Hydraulic system for controlling synchronous support of multiple support legs and engineering vehicle - Google Patents
Hydraulic system for controlling synchronous support of multiple support legs and engineering vehicle Download PDFInfo
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- CN103057526B CN103057526B CN201310001444.2A CN201310001444A CN103057526B CN 103057526 B CN103057526 B CN 103057526B CN 201310001444 A CN201310001444 A CN 201310001444A CN 103057526 B CN103057526 B CN 103057526B
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- 230000001360 synchronised effect Effects 0.000 title abstract description 7
- 230000002457 bidirectional effect Effects 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001141 propulsive effect Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The invention discloses a hydraulic system for controlling synchronous support of a plurality of supporting legs, which comprises a plurality of supporting leg oil cylinders for respectively driving the supporting legs and a main reversing valve for controlling oil inlet and oil return of the supporting leg oil cylinders, wherein a piston rod cavity communicated with the hydraulic system is arranged in a piston rod, and is isolated from a rod cavity and a rodless cavity; and when the pressure of the pressure oil is greater than or equal to the pressure threshold value, the hydraulic system can control the pressure oil to drive the piston rod to extend out through the rodless cavity, so that the plurality of supporting leg oil cylinders enter a second extending state and can drive the supporting legs to synchronously support the load. The invention also discloses an engineering vehicle using the hydraulic system. Thereby ensuring the operation safety of the engineering vehicle.
Description
Technical field
The present invention relates to the field of hydraulic control of supporting leg, particularly, relate to and a kind ofly control the HYDRAULIC CONTROL SYSTEM that multiple supporting leg synchronously supports and the engineering truck using this hydraulic efficiency pressure system.
Background technology
Usually need support leg device is installed in the engineering trucks such as aerial platform, truck with loading crane, car hosit, to play stable and safety effect when vehicle operation.Wherein the vertical leg of support leg device needs to be driven by support oil cylinder after the control position of support leg device is chosen to stretch out downwards to support ground.Wherein, it is multiple that the support oil cylinder quantity of the vertical leg in engineering truck is generally 5,4 or 2 etc.
But in engineering truck in the prior art, the hydraulic efficiency pressure system controlling multiple support oil cylinder action does not design the synchronous support that special device ensures its multiple support oil cylinder.Therefore, when controlling all Vertical Cylinders and stretch out simultaneously, the impact of the not equal reason of the friction coefficient because of each oil cylinder, asynchronous when causing each Vertical Cylinders to stretch out, this makes respective vertical oil cylinder first reach ground, and just continues when not waiting for that other Vertical Cylinders reaches ground to stretch downwards, and by the somewhere of vehicle or a few place is high props up, thus cause inclination of vehicle, bring potential safety hazard.This phenomenon is especially serious to the engineering truck that deadweight is lighter, such as: 12 meters of aerial platforms, 3 tons of truck with loading cranes etc.
Therefore, a kind of hydraulic efficiency pressure system that can control the synchronous propping works vehicle of multiple support oil cylinder is provided to have positive effect.
Summary of the invention
An object of the present invention is to provide a kind of hydraulic efficiency pressure system controlling multiple supporting leg and synchronously support, this hydraulic efficiency pressure system synchronously can support load stretching out in process of support oil cylinder, safety and practicality high.
Another object of the present invention is to provide a kind of engineering truck, and this project vehicle uses hydraulic efficiency pressure system provided by the invention to drive multiple vertical leg to move, to ensure safety.
To achieve these goals, according to an aspect of the present invention, a kind of hydraulic efficiency pressure system controlling multiple supporting leg and synchronously support is provided, comprise the main reversing valve driving multiple support oil cylinder of the plurality of supporting leg respectively and control the plurality of support oil cylinder oil-feed and oil return, described support oil cylinder comprises piston rod, rod chamber and rodless cavity, wherein, described piston rod inner is provided with the rod end chamber be communicated with described hydraulic efficiency pressure system, this rod end chamber is isolated from described rod chamber and described rodless cavity, the pressure oil of described hydraulic efficiency pressure system can drive described piston rod to stretch out by described rod end chamber and/or described rodless cavity, wherein, when described multiple support oil cylinder stretches out, first described hydraulic efficiency pressure system can drive described piston rod to stretch out by the described rod end chamber of each described support oil cylinder by control presssure oil, enter first to make described multiple support oil cylinder stretch out state and described supporting leg zero load can be driven to stretch out, and when the pressure of pressure oil is more than or equal to pressure threshold, described hydraulic efficiency pressure system can drive described piston rod to stretch out by described rodless cavity by control presssure oil, enters second stretch out state and described supporting leg can be driven synchronously to support load to make described multiple support oil cylinder.
Preferably, described rodless cavity is communicated with the first actuator port of described main reversing valve by the first working oil path, described rod end chamber is communicated with the first actuator port of described main reversing valve by the second working oil path, described rod chamber is communicated with the second actuator port of described main reversing valve by the 3rd working oil path, and described hydraulic efficiency pressure system comprises the pilot operated valve device with the first setting pressure, when the pressure oil pressure of described first actuator port is less than described setting pressure, described pilot operated valve device makes the pressure oil of described first actuator port only enter described second working oil path, enter described first to drive described support oil cylinder and stretch out state, when the pressure oil of described first actuator port is equal to or greater than described setting pressure, described pilot operated valve device can make the pressure oil of described first actuator port enter described first working oil path, enter described second to drive described support oil cylinder and stretch out state, wherein, described first setting pressure equals described pressure threshold.
Preferably, described pilot operated valve device is be arranged on the sequence valve in described first working oil path, and described first working oil path is also provided with described sequence valve and the first check valve connect, this first check valve allows fluid to flow to described first actuator port from described rodless cavity.
Preferably, described hydraulic efficiency pressure system also comprises switch valve, this switch valve is serially connected between described first working oil path and described 3rd working oil path, and when described HYDRAULIC CONTROL SYSTEM pressure oil drives described support oil cylinder by means of only the second working oil path, described switch valve is opened.
Preferably, described switch valve is the hydraulic-controlled switch valve with the second setting pressure, the oil circuit control of this hydraulic-controlled switch valve is communicated with described second working oil path, wherein said second setting pressure is less than described first setting pressure, and be also provided with the second check valve be connected in series with described switch valve between described first working oil path and described 3rd working oil path, this second check valve allows fluid to flow to described first working oil path from described 3rd working oil path.
Preferably, described first working oil path, be provided with bidirectional hydraulic lock between the second working oil path and the 3rd working oil path.
Preferably, described bidirectional hydraulic lock comprises the first hydraulic control one-way valve and the second hydraulic control one-way valve, described first working oil path is connected with the second actuator port of described main reversing valve by oil circuit with described second working oil path, described first hydraulic control one-way valve to be arranged in described 3rd working oil path and to be controlled by described oil circuit, and described second hydraulic control one-way valve to be arranged on described oil circuit and to be controlled by described 3rd working oil path.
Preferably, described bidirectional hydraulic lock comprises the first hydraulic control one-way valve, the second hydraulic control one-way valve and the 3rd hydraulic control one-way valve, described first hydraulic control one-way valve to be arranged in described 3rd working oil path and to be controlled by described first working oil path or described second working oil path, described second hydraulic control one-way valve is arranged on described first working oil path, described 3rd hydraulic control one-way valve is arranged in described second working oil path, and described second hydraulic control one-way valve and the 3rd hydraulic control one-way valve control by described 3rd working oil path.
Preferably, the cylinder bottom of described support oil cylinder is fixed with the oil-deflecting rod extended in cylinder barrel, described piston rod can move in described cylinder barrel along described oil-deflecting rod, be formed with described rod end chamber between described oil-deflecting rod and described piston rod, and the inside of described oil-deflecting rod is provided with the Oil Guide passage being communicated with described hydraulic efficiency pressure system and rod end chamber.
Preferably, described cylinder bottom is provided with the first tubing interface, the second tubing interface and the 3rd tubing interface, described first tubing interface and described Oil Guide channel connection, described second tubing interface is communicated with described rodless cavity, and described 3rd tubing interface is communicated with described rod chamber.
Preferably, described main reversing valve is multiple directional control valve.
According to a further aspect in the invention, a kind of engineering truck is provided, this project vehicle has multiple vertical leg, it is characterized in that, the motion of multiple vertical leg described in the HYDRAULIC CONTROL SYSTEM that described engineering truck uses the multiple supporting leg of control provided by the invention synchronously to support.
Pass through technique scheme, what have two kinds of different driving power due to the support oil cylinder in hydraulic efficiency pressure system provided by the invention stretches out state, when first stretches out state, because the less propulsive effort of rod end chamber cross-sectional area being arranged on piston rod inner is less, piston rod zero load can only stretch out and load support can not be carried out, therefore whichever supporting leg is needed first to contact bearing surface, when all needing waiting system pressure to be elevated to pressure threshold, namely multiple support oil cylinder can enter second when stretching out state, can support load, therefore, it is possible to realize the synchronous support of multiple supporting leg to load.Thus ensure the job safety of the engineering truck using the multiple leg motion of this HYDRAULIC CONTROL SYSTEM.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the sectional structure schematic diagram of the support oil cylinder that the preferred embodiment for the present invention provides;
Fig. 2 is the structure principle chart of the hydraulic efficiency pressure system that the multiple support oil cylinder of control that the preferred embodiment for the present invention provides synchronously supports;
Fig. 3 is the enlarged drawing of local structure in Fig. 2, shows the parts annexation in the first embodiment;
Fig. 4 shows the parts annexation in the preferred embodiment for the present invention in the second embodiment;
Fig. 5 shows the parts annexation in the preferred embodiment for the present invention in the 3rd embodiment.
Description of reference numerals
1 support oil cylinder 2 main reversing valve
3 pilot operated valve device 5 switch valves
6 bidirectional hydraulic locks
11 piston rod 12 rod chambers
13 rodless cavity 14 rod end chambers
15 cylinder bottom 16 cylinder barrels
17 oil-deflecting rod 21 oil-feed connection
22 commutation connection 41 first check valves
42 second check valve 61 first hydraulic control one-way valves
62 second hydraulic control one-way valve 63 the 3rd hydraulic control one-way valves
A first actuator port B second actuator port
D first tubing interface E second tubing interface
F the 3rd tubing interface
A first working oil path b second working oil path
C the 3rd working oil path d Oil Guide passage
Ab oil circuit
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
First it should be noted that, the present invention relates to field of hydraulic control, first it should be noted that, in Fig. 2 to Fig. 5 of the present invention, only show hydraulic schematic diagram, for a person skilled in the art, identical hydraulic connecting principle can be realized by various different mechanical entities structure.Such as, between sequence valve 3 and the first check valve 41, can be undertaken connecting by pipeline between switch valve 5 and the second check valve 42 etc. and also can form integrated form combination valve, namely each composition valve can be formed or be assembled in shared valve body, now integrated form combination valve is except several ports for connecting external pipe of valve body outside, and the hydraulic fluid port that each composition valve shows in hydraulic schematic diagram may be only oil duct or the oil pocket of valve inner.In addition, main reversing valve is owing to can adopt the mode of multiple directional control valve, and therefore the first actuator port A can be multiple commutation different with correspondence connection.Therefore, term involved in the present invention should not be limited to its dictionary meanings, but should be the implication that art technology people can understand.
First, as the basis of hydraulic efficiency pressure system provided by the invention, first introduce and provided by the invention there is multiple support oil cylinder 1 stretching out state, it should be noted that, the structure that this support oil cylinder 1 adopts is equally applicable to other needs difference to stretch out state, especially need each state of stretching out to have the hydraulic actuating cylinder of different driving power, to its application, the present invention does not limit.
As shown in Figure 1, support oil cylinder 1 provided by the invention comprises piston rod 11, rod chamber 12, rodless cavity 13, cylinder bottom 15 and cylinder barrel 16, in order to realize, when piston rod 11 stretches out, there is different propulsive efforts, piston rod 11 inside of support oil cylinder 1 provided by the invention is provided with the rod end chamber 14 be communicated with hydraulic efficiency pressure system, this rod end chamber 14 is isolated from rod chamber 12 and rodless cavity 13, and the pressure oil of hydraulic efficiency pressure system can be stretched out by rod end chamber 14 and/or rodless cavity 13 piston rod 11.
Wherein, cross-sectional area due to the rod end chamber 14 being arranged on piston rod 11 inside is less than the area of rodless cavity 13, therefore compare and promote by rodless cavity 13 power that piston rod 11 stretches out, the power that piston rod 11 stretches out is promoted less by rod end chamber 14, by according to unequally loaded appropriate design, support oil cylinder 1 can be made to have three kinds and different stretch out state, the first is the state of stretching out promoting piston cylinder by means of only rod end chamber 14, now carries out suitable repairing to rodless cavity 13.Wherein this can be stretched out stretching out of the piston rod of state to be designed to only to be used for zero load and to stretch out, namely, be merely able to make piston rod 11 stretch out and load can not be driven, the second is then for promote stretching out of piston rod by means of only rodless cavity 13, now carry out suitable repairing to rod end chamber 14, the third is then simultaneously to promotion piston rod 11 by rodless cavity 13 and rod end chamber 14.Wherein latter two is stretched out state and all can be driven load, can optionally adopt in actual use.Such as, in the hydraulic efficiency pressure system provided in a preferred embodiment of this invention, mode that piston rod 11 stretches out can be promoted to drive load by two chambeies simultaneously.
The support oil cylinder that can realize technique scheme has multiple, the such as set-up mode etc. in piston cylinder chamber, wherein in a preferred embodiment of the invention, as shown in Figure 1, the cylinder bottom 15 of support oil cylinder 1 is fixed with the oil-deflecting rod 17 extended in cylinder barrel 16, piston rod 11 can be mobile in cylinder barrel 16 along oil-deflecting rod 17, rod end chamber 14 is formed between oil-deflecting rod 17 and piston rod 11, wherein in order to ensure the leak tightness of rod end chamber, the movable sealing structure that oil cylinder field is conventional can be set between piston rod 11 and oil-deflecting rod 17, not do at this and too much repeat.Further, the inside of oil-deflecting rod 17 is provided with the Oil Guide passage d being communicated with hydraulic efficiency pressure system and rod end chamber 14.Therefore, it is possible to rod end chamber 14 is connected with corresponding hydraulic efficiency pressure system by Oil Guide passage d.
Wherein, oil-deflecting rod 17 is the rod component of a hollow, and its one end is fixed on to be communicated with the oil circuit of outside on cylinder bottom 15, and the other end stretches in piston rod 11, to be communicated with the rod end chamber 14 formed with piston rod 11, and provides acting point for the motion of piston rod 11.In addition, the design of support oil cylinder 1 has various ways, particularly, the first tubing interface D, the second tubing interface E and the 3rd tubing interface F can be provided with on cylinder bottom 15, wherein, first tubing interface D can directly be communicated with the Oil Guide passage d in the oil-deflecting rod 17 be fixed on cylinder bottom 15, and the second tubing interface E is then communicated with rodless cavity 13 by the runner be formed on cylinder bottom 15, and the 3rd tubing interface F is then communicated with by the pipeline rod chamber 12 be arranged on outside cylinder barrel 16.Thus realize the difference realizing support oil cylinder provided by the invention by arranging different hydraulic efficiency pressure systems to stretch out state.For the set-up mode of this concrete structure, those skilled in the art can make various change and replacement, and these change and replacement all should drop in protection scope of the present invention.
Above describe the structure of support oil cylinder provided by the invention, based on the structure of this support oil cylinder, introduce the hydraulic efficiency pressure system that the multiple supporting leg of control provided by the invention synchronously supports below.As shown in Figure 2, the invention provides a kind of hydraulic efficiency pressure system controlling multiple supporting leg and synchronously support, comprise the multiple support oil cylinders 1 driving the plurality of supporting leg respectively and the main reversing valve 2 controlling the oil-feed of the plurality of support oil cylinder 1 and oil return, the support oil cylinder 1 that this support oil cylinder 1 i.e. the invention described above provides, main reversing valve 2 can be multiple change-over valve pattern known in this area in addition, by the commutation of this main reversing valve 2, actuating unit can be changed, as the state of stretching out or retracting of the support oil cylinder in the present invention.
Such as in a preferred embodiment of the invention, conveniently control the action of each oil cylinder with accurate and increase oil return speed, adopting multiple directional control valve to realize the extension and contraction control of multiple support oil cylinder 1.Particularly, multiple directional control valve comprises oil-feed connection 21 and commutation connection 22, an actuator port of the Reversing valve plate wherein in oil-feed connection 21 can be used as the second actuator port B of main reversing valve 2, another actuator port is then connected with each Reversing valve plate in joining that commutates, and using each Reversing valve plate actuator port as the first actuator port A of main reversing valve 2.Thus realize stretching out and retracting of corresponding support oil cylinder 1 by switching each Reversing valve plate.Such as in fig. 2, when specific works, when each Reversing valve plate is all switched to upper, then the pressure oil of Hydraulic Pump P drives the piston rod 11 of support oil cylinder 1 to retract by the second actuator port B corresponding with the Reversing valve plate that oil-feed joins in 21, the oil return of support oil cylinder 1 then by corresponding the first actuator port A oil return of the Reversing valve plate in joining with commutation in fuel tank T.And when the Reversing valve plate in oil-feed connection 21 is switched to bottom, when commutation connection 22 Reversing valve plate is all switched to upper, then support oil cylinder 1 can stretch out, now by the first actuator port A fuel feeding, the second actuator port B oil return, does not do at this and too much repeats.
Get back in design of the present invention, in order to realize object of the present invention, when multiple support oil cylinder 1 stretches out, first hydraulic efficiency pressure system can be stretched out by rod end chamber 14 piston rod 11 of each support oil cylinder 1 by control presssure oil, enter first to make multiple support oil cylinder 1 stretch out state and supporting leg zero load can be driven to stretch out, now multiple support oil cylinder 1 starts to stretch out towards bearing surfaces such as ground.Piston rod 11 wherein owing to now being promoted by rod end chamber 14 is only zero load and stretches out, can not by load-supporting.Even if therefore because the reasons such as friction coefficient cause the piston cylinder of each support oil cylinder 1 to arrive bearing surface with different time, the support oil cylinder 1 arrived first can not by load support, this avoid certain part occurring load first supported the safety problem brought.At this moment, the support oil cylinder 1 arriving first bearing surface starts to build the pressure, and makes the pressure of system start to rise.
Then, when the pressure of pressure oil is more than or equal to pressure threshold, hydraulic efficiency pressure system can be stretched out by rodless cavity 13 piston rod 11 by control presssure oil, enters second stretch out state and supporting leg can be driven synchronously to support load to make multiple support oil cylinder 1.Namely, when second stretches out state, hydraulic efficiency pressure system can promote piston rod 11 to support load by rodless cavity 13 by control presssure oil, because the pressure of now total system reaches pressure threshold, each support oil cylinder 1 can carry out load support simultaneously, that is, the synchronous support of support oil cylinder is achieved.Wherein, in above process, whichever supporting leg first contacts bearing surface when first stretches out state, when corresponding support oil cylinder 1 all needs waiting system pressure to be elevated to pressure threshold, synchronously can support load together with other supporting legs, ensure that the safety of load.
It should be noted that, the embodiment that can complete technique scheme has multiple, such as corresponding valve member selection and set-up mode etc.The present invention for convenience of description, in this introduction preferred implementation wherein, this preferred implementation, only for illustration of the present invention, is not limited to the present invention.
As shown in Figures 2 and 3, in a preferred embodiment of the invention, the rodless cavity 13 of support oil cylinder 1 is communicated with the first actuator port A of main reversing valve 2 by the first working oil path a, rod end chamber 14 is communicated with the first actuator port A of main reversing valve 2 by the second working oil path b, rod chamber 12 is communicated with the second actuator port B of main reversing valve 2 by the 3rd working oil path c, wherein conveniently the first actuator port a is connected with the first actuator port A of main reversing valve 2 with the second actuator port b, these two working oil path can be made to be connected with the first actuator port A by an oil circuit ab.Certainly all should drop in protection scope of the present invention for other connection modes well known in the art.
Stretch out to complete in technical solution of the present invention first the switching that state and second stretches out state, hydraulic efficiency pressure system provided by the invention comprises the pilot operated valve device 3 with the first setting pressure, and this first setting pressure equals above-mentioned pressure threshold.When the pressure oil pressure of the first actuator port A of main reversing valve 2 is less than setting pressure, pilot operated valve device 3 makes the pressure oil of the first actuator port A only enter the second working oil path b, namely promote piston rod 11 zero load by rod end chamber 14 to stretch out, enter first to drive support oil cylinder 1 and stretch out state, and when the pressure oil of the first actuator port A of main reversing valve 2 is equal to or greater than setting pressure, pilot operated valve device 3 can make the pressure oil of the first actuator port A enter the first working oil path a, namely, piston rod 11 is promoted by rodless cavity 13, enter second to drive support oil cylinder 1 and stretch out state, namely the synchronous support of each supporting leg is realized.
Wherein, the kind of the pilot operated valve device 3 in the present invention can be multiple, such as, gather the invention provides preferred implementation, pilot operated valve device 3 is for being arranged on the sequence valve on the first working oil path a, more specifically, this sequence valve is internal control sequence valve, and whether it opens the Stress control by place oil circuit.And the first working oil path a is also provided with sequence valve and the first check valve 41 connect, this first check valve 41 allows fluid to flow to the first actuator port A from rodless cavity.Therefore, when the first actuator port A of main reversing valve 2 starts oil-feed, pressure due to the first working oil path a does not reach the first setting pressure of sequence valve, and the existence of the first check valve 41, make now the first working oil path a can not conducting, therefore the pressure oil from main reversing valve 2 all can flow to the second working oil path b, thus promotes piston rod 11 zero load by rod end chamber 14 and stretch out.And when meeting and exceeding the first setting pressure after the pressure of system starts rising, now the first working oil path a conducting, now can enter the first working oil path a from the pressure oil of the first actuator port A, thus promote piston rod 11 pairs of loads by rodless cavity 13 and synchronously support.And owing to being provided with the first check valve 41, can ensure when support oil cylinder 1 is retracted, the oil return of rodless cavity 13 can flow back to main reversing valve 2 smoothly.
It should be noted that, the mode of sequence valve is adopted to be optimal way of the present invention in optimal way of the present invention, now because the second working oil path b can carry out oil-feed, therefore in fact simultaneously simultaneously piston rod 11 promoted by the fluid in rodless cavity 13 and rod end chamber 14.That is, when being promoted piston rod 11 by rodless cavity 13 and stretching out, also continue to promote piston rod 11 by rod end chamber 14, make piston rod 11 can obtain maximum thrust.Certainly; in other NM embodiments, arranged by difference, also only can carry out suitable repairing to rod end chamber 14; and pressure oil is not led in rod end chamber 14, this promotes by rodless cavity 13 mode that piston rod 11 stretches out and drops on equally in protection scope of the present invention.
Particularly, in this embodiment, the pilot operated directional control valve by pilot operated valve device 3 is replaced by connection first working oil path a and the second working oil path b from sequence valve realizes.When carry out support oil cylinder 1 first stretches out state, the pressure oil of the first actuator port A is distributed to the second working oil path b by pilot operated directional control valve; And after system pressure reaches the first setting pressure, pilot operated directional control valve commutates, and the pressure oil of the first actuator port A is distributed to the first working oil path a.Wherein when second stretches out state, need setting on the relevant work position of pilot operated directional control valve can be the path of the second working oil path b repairing, and this path is connected fuel tank, can stretch out smoothly to make piston rod 11.Except this mode of texturing, other can realize mode of texturing of the present invention and also should drop in protection scope of the present invention.
In addition, in the inventive solutions, support oil cylinder 1 carry out first stretch out state time, need rod chamber 12 can draining, and rodless cavity 13 repairing can ensure that piston rod 11 stretches out smoothly under the promotion of rod end chamber 14.In order to realize this process better, in preferred implementation provided by the invention, hydraulic efficiency pressure system also comprises switch valve 5, this switch valve 5 is serially connected between the first working oil path a and the 3rd working oil path c, when HYDRAULIC CONTROL SYSTEM pressure oil drives support oil cylinder 1 by means of only the second working oil path b, switch valve 5 is opened.Therefore, it is possible to be communicated with rod chamber 12 by the rodless cavity 13 of support oil cylinder 1, now rod chamber 12 draining can add in rodless cavity 13, thus can realize first of above-mentioned support oil cylinder and stretch out state.Wherein, because support oil cylinder 1 is when identical stroke, needed for rodless cavity 13, the oil mass of repairing is greater than the oil mass that rod chamber 12 can provide, now as shown in Figures 2 and 3, at rod chamber 12 to while rodless cavity 13 repairing, because the 3rd working oil path c can be communicated with fuel tank T by following bidirectional hydraulic lock 6, therefore fluid can be converged with the fluid that rod chamber 12 releases by the second following hydraulic control one-way valve 62 after together with supply rodless cavity 13, thus normally the stretching out of guarantee piston rod 11.
The concrete structure that wherein can realize this scheme has multiple, preferably, switch valve 5 is for having the hydraulic-controlled switch valve of the second setting pressure, the oil circuit control of this hydraulic-controlled switch valve is communicated with the second working oil path b, wherein the second setting pressure is less than the first setting pressure, therefore under there is the pressure oil condition being equal to or greater than the second setting pressure in the second working oil path b, first working oil path a can be communicated with the 3rd working oil path c, thus realize promoting that piston rod 11 stretches out by rod end chamber 14 first stretch out state.And in order to ensure when second stretches out state, pressure oil in first working oil path a can not directly from the 3rd working oil path c oil return, also need between the first working oil path a and the 3rd working oil path c, be also provided with the second check valve 42 be connected in series with switch valve 5, this second check valve 42 allows fluid to flow to the first working oil path a from the 3rd working oil path c.Therefore the pressure oil ensureing in the first working oil path a enters smoothly in rodless cavity 13 and promotes piston rod 11, stretches out state with complete support oil cylinder 1 second.
The above-mentioned technical solution of the present invention described in preferred implementation, in addition in order to ensure the stability of supporting leg work, as shown in Figures 3 to 5, preferably, bidirectional hydraulic lock 6 is provided with between the first working oil path a, the second working oil path b and the 3rd working oil path c.Well known, bidirectional hydraulic lock is made up of two or more hydraulic control one-way valve, can lock the current operating state of actuating unit, be particularly useful for leg control system.Wherein in optimal way of the present invention, bidirectional hydraulic lock can have two hydraulic control one-way valves also can have three hydraulic control one-way valves, and it can be independent valve member, also can be and other valve members, integral type combination valve as mutually integrated in sequence valve 3, switch valve 5, the present invention does not limit this.
Particularly, in figs. 2 and 3, in the first embodiment, bidirectional hydraulic lock 6 is made up of two hydraulic control one-way valves, namely, bidirectional hydraulic lock 6 comprises the first hydraulic control one-way valve 61 and the second hydraulic control one-way valve 62, first hydraulic control one-way valve 61 and to be arranged on the 3rd working oil path c and to be controlled by oil circuit ab, and the second hydraulic control one-way valve 62 to be arranged on oil circuit ab and to be controlled by the 3rd working oil path c.That is, when the first actuator port A oil-feed of main reversing valve 2, oil circuit ab has pressure oil.The second hydraulic control one-way valve 62 being now arranged on the 3rd working oil path c can be opened, thus make the rod chamber 12 of support oil cylinder 1 can oil return, on the contrary, when the second actuator port B oil-feed of main reversing valve 2,3rd working oil path c has pressure oil, the first hydraulic control one-way valve 61 be now arranged on oil circuit ab can be opened, thus makes the rodless cavity 13 of support oil cylinder 1 can oil return.
In addition, as shown in Figure 4 and Figure 5, in the second embodiment and the 3rd embodiment, bidirectional hydraulic lock 6 is made up of three hydraulic control one-way valves, now be applicable to bidirectional hydraulic lock 6 between pilot operated valve device 3 and switch valve 5, that is, the first working oil path a, the second working oil path b and the 3rd working oil path c all arrange hydraulic control one-way valve.Particularly, comprise the first hydraulic control one-way valve 61, second hydraulic control one-way valve 62 and the 3rd hydraulic control one-way valve 63, first hydraulic control one-way valve 61 to be arranged on the 3rd working oil path c and to be controlled by the first working oil path a or the second working oil path b, with when the first working oil path a or the second working oil path b oil-feed, open this first hydraulic control one-way valve 61, ensure the oil return of rod chamber 12.Second hydraulic control one-way valve 62 is arranged on the first working oil path a, 3rd hydraulic control one-way valve 63 is arranged on the second working oil path b, and the second hydraulic control one-way valve 62 and the 3rd hydraulic control one-way valve 63 control by the 3rd working oil path c, namely can ensure the oil return of rod end chamber 14 and rodless cavity 13.Now, the oil circuit control of switch valve 5 also can be communicated with the oil circuit control of the first hydraulic control one-way valve 61.
To sum up, the hydraulic efficiency pressure system based on support oil cylinder provided by the invention can control multiple supporting leg and synchronously support load.Especially, in the engineering truck that multiple vertical leg is set, can ensure in support process, the safety of engineering truck.Therefore, support oil cylinder provided by the invention and engineering truck all have higher practicality and promotional value.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. the hydraulic efficiency pressure system controlling multiple supporting leg and synchronously support, comprise the multiple support oil cylinders (1) driving the plurality of supporting leg respectively and the main reversing valve (2) controlling (1) oil-feed of the plurality of support oil cylinder and oil return, described support oil cylinder (1) comprises piston rod (11), rod chamber (12) and rodless cavity (13), it is characterized in that, described piston rod (11) inside is provided with the rod end chamber (14) be communicated with described hydraulic efficiency pressure system, this rod end chamber (14) is isolated from described rod chamber (12) and described rodless cavity (13), the pressure oil of described hydraulic efficiency pressure system can drive described piston rod (11) to stretch out by described rod end chamber (14) and/or described rodless cavity (13),
Wherein, when described multiple support oil cylinder (1) is stretched out, first described hydraulic efficiency pressure system can drive described piston rod (11) to stretch out by the described rod end chamber (14) of each described support oil cylinder (1) by control presssure oil, enters first stretch out state and described supporting leg zero load can be driven to stretch out to make described multiple support oil cylinder (1); And when the pressure of pressure oil is more than or equal to pressure threshold, described hydraulic efficiency pressure system can drive described piston rod (11) to stretch out by described rodless cavity (13) by control presssure oil, enters second stretch out state and described supporting leg can be driven synchronously to support load to make described multiple support oil cylinder (1).
2. hydraulic efficiency pressure system according to claim 1, it is characterized in that, described rodless cavity (13) is communicated with first actuator port (A) of described main reversing valve (2) by the first working oil path (a), described rod end chamber (14) is communicated with first actuator port (A) of described main reversing valve (2) by the second working oil path (b), described rod chamber (12) is communicated with second actuator port (B) of described main reversing valve (2) by the 3rd working oil path (c), and described hydraulic efficiency pressure system comprises the pilot operated valve device (3) with the first setting pressure, when the pressure oil pressure of described first actuator port (A) is less than described first setting pressure, described pilot operated valve device (3) makes the pressure oil of described first actuator port (A) only enter described second working oil path (b), enter described first to drive described support oil cylinder (1) and stretch out state, when the pressure oil of described first actuator port (A) is equal to or greater than described first setting pressure, described pilot operated valve device (3) can make the pressure oil of described first actuator port (A) enter described first working oil path (a), enter described second to drive described support oil cylinder (1) and stretch out state, wherein, described first setting pressure equals described pressure threshold.
3. hydraulic efficiency pressure system according to claim 2, it is characterized in that, described pilot operated valve device (3) is for being arranged on the sequence valve in described first working oil path (a), and described first working oil path (a) is also provided with described sequence valve and the first check valve (41) connect, this first check valve (41) allows fluid to flow to described first actuator port (A) from described rodless cavity.
4. hydraulic efficiency pressure system according to claim 2, it is characterized in that, described hydraulic efficiency pressure system also comprises switch valve (5), this switch valve (5) is serially connected between described first working oil path (a) and described 3rd working oil path (c), when described HYDRAULIC CONTROL SYSTEM pressure oil drives described support oil cylinder (1) by means of only the second working oil path (b), described switch valve (5) is opened.
5. hydraulic efficiency pressure system according to claim 4, it is characterized in that, described switch valve (5) is for having the hydraulic-controlled switch valve of the second setting pressure, the oil circuit control of this hydraulic-controlled switch valve is communicated with described second working oil path (b), wherein said second setting pressure is less than described first setting pressure, and be also provided with the second check valve (42) be connected in series with described switch valve (5) between described first working oil path (a) and described 3rd working oil path (c), this second check valve (42) allows fluid to flow to described first working oil path (a) from described 3rd working oil path (c).
6. according to the hydraulic efficiency pressure system in claim 2-5 described in any one, it is characterized in that, described first working oil path (a), between the second working oil path (b) and the 3rd working oil path (c), be provided with bidirectional hydraulic lock (6).
7. hydraulic efficiency pressure system according to claim 6, it is characterized in that, described bidirectional hydraulic lock (6) comprises the first hydraulic control one-way valve (61) and the second hydraulic control one-way valve (62), described first working oil path (a) is connected with second actuator port (A) of described main reversing valve (2) by oil circuit (ab) with described second working oil path (b), described first hydraulic control one-way valve (61) is arranged on described 3rd working oil path (c) and goes up and controlled by described oil circuit (ab), described second hydraulic control one-way valve (62) is arranged on described oil circuit (ab) and goes up and controlled by described 3rd working oil path (c).
8. hydraulic efficiency pressure system according to claim 6, it is characterized in that, described bidirectional hydraulic lock (6) comprises the first hydraulic control one-way valve (61), second hydraulic control one-way valve (62) and the 3rd hydraulic control one-way valve (63), described first hydraulic control one-way valve (61) is arranged on described 3rd working oil path (c) and goes up and controlled by described first working oil path (a) or described second working oil path (b), described second hydraulic control one-way valve (62) is arranged on described first working oil path (a), described 3rd hydraulic control one-way valve (63) is arranged in described second working oil path (b), and described second hydraulic control one-way valve (62) and the 3rd hydraulic control one-way valve (63) control by described 3rd working oil path (c).
9. according to the hydraulic efficiency pressure system in claim 1-5 described in any one, it is characterized in that, the cylinder bottom (15) of described support oil cylinder (1) is fixed with the oil-deflecting rod (17) extended in cylinder barrel (16), described piston rod (11) can be mobile in described cylinder barrel (16) along described oil-deflecting rod (17), described rod end chamber (14) is formed between described oil-deflecting rod (17) and described piston rod (11), and the inside of described oil-deflecting rod (17) is provided with Oil Guide passage (d) being communicated with described hydraulic efficiency pressure system and rod end chamber (14).
10. hydraulic efficiency pressure system according to claim 9, it is characterized in that, described cylinder bottom (15) is provided with the first tubing interface (D), the second tubing interface (E) and the 3rd tubing interface (F), described first tubing interface (D) is communicated with described Oil Guide passage (d), described second tubing interface (E) is communicated with described rodless cavity (13), and described 3rd tubing interface (F) is communicated with described rod chamber (12).
11. hydraulic efficiency pressure systems according to claim 1, is characterized in that, described main reversing valve (2) is multiple directional control valve.
12. 1 kinds of engineering trucks, this project vehicle has multiple vertical leg, it is characterized in that, the hydraulic efficiency pressure system that described engineering truck uses the multiple supporting leg of control in claim 1-11 described in any one synchronously to support, and controls the motion of described multiple vertical leg.
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| CN201310001444.2A CN103057526B (en) | 2013-01-04 | 2013-01-04 | Hydraulic system for controlling synchronous support of multiple support legs and engineering vehicle |
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| CN201310001444.2A CN103057526B (en) | 2013-01-04 | 2013-01-04 | Hydraulic system for controlling synchronous support of multiple support legs and engineering vehicle |
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| CN107651029A (en) * | 2017-09-06 | 2018-02-02 | 徐州华邦专用汽车有限公司 | A kind of flexible fan blade transport vehicle of mixed motivity type |
| CN110285107A (en) * | 2019-08-01 | 2019-09-27 | 江苏集萃道路工程技术与装备研究所有限公司 | A kind of the passive type control valve group and thrust wheel system of thrust wheel |
| CN111533013A (en) * | 2020-05-07 | 2020-08-14 | 三一汽车起重机械有限公司 | Novel hydraulic system and engineering machinery get off |
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| CN102079298A (en) * | 2010-12-28 | 2011-06-01 | 三一重工股份有限公司 | Mobile engineering machine and control system of support leg thereof |
| CN102434512A (en) * | 2011-12-14 | 2012-05-02 | 徐州重型机械有限公司 | Hydraulic cylinder synchronization control loop and crane with same |
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| JP2925949B2 (en) * | 1994-09-30 | 1999-07-28 | 古河機械金属株式会社 | Jack control device for heavy equipment transport vehicles |
| JP3877105B2 (en) * | 1998-09-22 | 2007-02-07 | 株式会社スギヤス | Hydraulic tuning device and hydraulic lift |
| WO2004061312A1 (en) * | 2002-12-27 | 2004-07-22 | Hitachi Construction Machinery Co.,Ltd. | Drive device of hydraulic cylinder for working |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102079298A (en) * | 2010-12-28 | 2011-06-01 | 三一重工股份有限公司 | Mobile engineering machine and control system of support leg thereof |
| CN202294727U (en) * | 2011-09-22 | 2012-07-04 | 上海宝冶集团有限公司 | Electric hydraulic control system for landing legs and hooks of bucket truck |
| CN102434512A (en) * | 2011-12-14 | 2012-05-02 | 徐州重型机械有限公司 | Hydraulic cylinder synchronization control loop and crane with same |
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