CN103423221B - Multi-oil-cylinder sequence telescopic hydraulic system and engineering machinery - Google Patents
Multi-oil-cylinder sequence telescopic hydraulic system and engineering machinery Download PDFInfo
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- CN103423221B CN103423221B CN201310313783.4A CN201310313783A CN103423221B CN 103423221 B CN103423221 B CN 103423221B CN 201310313783 A CN201310313783 A CN 201310313783A CN 103423221 B CN103423221 B CN 103423221B
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Abstract
The invention discloses a kind of Multi-oil-cylinder sequence telescopic hydraulic system and engineering machinery.This Multi-oil-cylinder sequence telescopic hydraulic system comprises main valve, the first oil cylinder, the second oil cylinder, the first switch valve, second switch valve and selector valve, wherein: the first actuator port of main valve and the second actuator port are connected to the first hydraulic fluid port of second switch valve and the first hydraulic fluid port of the first switch valve respectively; The filler opening of selector valve and return opening are connected to the second hydraulic fluid port of second switch valve and the second hydraulic fluid port of the first switch valve respectively, and the first actuator port of selector valve and the second actuator port are connected to the rodless cavity of the second oil cylinder and the rodless cavity of the first oil cylinder respectively; The rod chamber of the first oil cylinder is connected to the rod chamber of the second oil cylinder, and the rod chamber of the first oil cylinder is connected to the first hydraulic fluid port of the first switch valve or is connected to the second actuator port of main valve.Structure of the present invention is simple, without the need to adopting one way sequence valve or hydraulic lock etc., while guarantee reliability, reduces overall cost.
Description
Technical field
The present invention relates to Multi-cylinder sequential control technology field, particularly a kind of Multi-oil-cylinder sequence telescopic hydraulic system and engineering machinery.
Background technique
In order to increase span, improving stability, the engineering machinery such as hoist being generally provided with at least two-stage telescopic outrigger (oil cylinder), such as, can comprising horizontal support legs and vertical leg.When preparing lifting operation, needing first horizontal support legs to be stretched out, then vertical leg being stretched out and earth surface, to form the stable support face of lifting operation.After operation completes, prepare transition when moving, need again first vertical leg to be retracted, then horizontal support legs is retracted, with the requirement of satisfied transport.
In order to realize the sequential telescopic of multiple support oil cylinder, existing hydraulic system adopts main valve (main reversing valve (if the patent No. is the scheme disclosed in CN201120457409 and CN201120320733), for controlling oil inlet and oil return state), many realizations such as group one way sequence valve and/or hydraulic lock etc., wherein, one way sequence valve is used for realizing sequence control, and hydraulic lock is for realizing the locking of oil cylinder rodless cavity or rod chamber.But the structure of this scheme is comparatively complicated, the overall cost of each hydraulic element is higher.
Therefore, how improving for the complex structure of existing Multi-cylinder sequence control mode, shortcoming that cost is high, is those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, an object of the present invention is to provide a kind of Multi-oil-cylinder sequence telescopic hydraulic system, to reduce structural complexity, to reduce financial cost.
Particularly, Multi-oil-cylinder sequence telescopic hydraulic system of the present invention, comprise main valve, the first oil cylinder and the second oil cylinder, also comprise the first switch valve, second switch valve and selector valve, wherein: the first actuator port of described main valve and the second actuator port are connected to the first hydraulic fluid port of described second switch valve and the first hydraulic fluid port of described first switch valve respectively; The filler opening of described selector valve and return opening are connected to the second hydraulic fluid port of described second switch valve and the second hydraulic fluid port of described first switch valve respectively, and the first actuator port of described selector valve and the second actuator port are connected to the rodless cavity of described second oil cylinder and the rodless cavity of described first oil cylinder respectively; The rod chamber of described first oil cylinder is connected to the rod chamber of described second oil cylinder, and the rod chamber of described first oil cylinder is connected to the first hydraulic fluid port of described first switch valve or is connected to the second actuator port of described main valve.
Further, also comprise back pressure valve, described back pressure valve is arranged on the oil circuit between the second actuator port of described main valve and the first hydraulic fluid port of described first switch valve.
Further, described selector valve is hydraulic control valve.
Further, the hydraulic control of described selector valve is terminated at the rodless cavity of described first oil cylinder, under original operating state, the filler opening of described selector valve is communicated in the first actuator port, return opening is communicated in the second actuator port, under another kind of working state, the filler opening of described selector valve is communicated in the second actuator port, and return opening is communicated in the first actuator port.
Further, the three-position four-way valve of described main valve to be Median Function be Y type or H type.
Further, the 3rd oil cylinder and the 3rd switch valve is also comprised; Described second switch valve and described 3rd switch valve are two-position three-way valve; 3rd hydraulic fluid port of described second switch valve is connected to the rodless cavity of described 3rd oil cylinder, the rod chamber of described 3rd oil cylinder is connected to the first hydraulic fluid port of described 3rd switch valve, and the second hydraulic fluid port of described 3rd switch valve and the 3rd hydraulic fluid port are connected to the 3rd hydraulic fluid port of described second switch valve and the second actuator port of described main valve respectively.
Further, also comprise the Pilot operated check valve on the oil circuit that is arranged between described second switch valve and described 3rd oil cylinder, the free filler opening of described Pilot operated check valve is connected to the 3rd hydraulic fluid port of described second switch valve, the free oil outlet of described Pilot operated check valve is connected to the rodless cavity of described 3rd oil cylinder, and the hydraulic control of described Pilot operated check valve is terminated at the first hydraulic fluid port of described 3rd switch valve.
Further, also comprise the one-way valve on the oil circuit that is arranged between described 3rd switch valve and described 3rd oil cylinder and relief valve, the filler opening of described one-way valve and the oil outlet of described relief valve are connected to the first hydraulic fluid port of described 3rd switch valve, and the oil outlet of described one-way valve and the filler opening of described relief valve are connected to the rod chamber of described 3rd oil cylinder.
When adopting Multi-oil-cylinder sequence telescopic hydraulic system of the present invention, by controlling the working state of the first switch valve, second switch valve, main valve and selector valve, the order that can realize the first oil cylinder and the second oil cylinder is stretched out and the order of the second oil cylinder and the first oil cylinder is retracted, and the rod chamber of each oil cylinder or the safe lock of rodless cavity can be realized in this process, avoid each oil cylinder under the effect of external force, occur unexpected flexible phenomenon; Compared with prior art, Multi-oil-cylinder sequence telescopic hydraulic system of the present invention can adopt simple first switch valve of structure, second switch valve and selector valve, and without the need to adopting the hydraulic element that the complex structure such as one way sequence valve or hydraulic lock, cost are higher, while guarantee reliability, reduce overall cost; In addition, if the rod chamber of the first oil cylinder is connected to the first hydraulic fluid port of the first switch valve, then the order that can also realize the first oil cylinder and the second oil cylinder is stretched out fast (differential stretch out), and that has saved the first oil cylinder and the second oil cylinder stretches out the time, improves efficiency.
In the optional scheme of one further, selector valve adopts hydraulic control valve, and the working state of this hydraulic control valve is controlled by the oil pressure size of the first oil cylinder rodless cavity, the working state of selector valve can be made so in the course of the work without the need to manual tune, but automatically regulate, to complete sequential telescopic action along with the oil pressure of the first oil cylinder rodless cavity.
In further a kind of possibility, Multi-oil-cylinder sequence telescopic hydraulic system of the present invention also comprises the 3rd oil cylinder and the 3rd switch valve, second switch valve and the 3rd switch valve are two-position three-way valve, the order that can realize the first oil cylinder, the second oil cylinder and the 3rd oil cylinder is like this stretched out, and the order realizing the 3rd oil cylinder, the second oil cylinder and the first oil cylinder is retracted, in addition, the stretching out fast of the 3rd oil cylinder (differential stretch out) can also be realized, about the 3rd oil cylinder stretch out the time, improve efficiency.
In further a kind of possibility, Pilot operated check valve is provided with between second switch valve and the 3rd oil cylinder, one-way valve and relief valve is provided with between the 3rd switch valve and the 3rd oil cylinder, the functional reliability of the 3rd oil cylinder can be ensured like this, avoid the 3rd oil cylinder to meet accident because of the effect of external force flexible phenomenon; In addition, relief valve can avoid the 3rd oil cylinder to damage because of the high oil temperature of rod chamber.
Two of object of the present invention is to provide a kind of engineering machinery, and this project machinery is provided with support leg hydraulic system, and this support leg hydraulic system is the Multi-oil-cylinder sequence telescopic hydraulic system described in above-mentioned any one.
Further, this project machinery is hoist.
Because above-mentioned Multi-oil-cylinder sequence telescopic hydraulic system has above-mentioned technique effect, therefore, engineering machinery of the present invention also has corresponding technique effect.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The principle schematic of a kind of Multi-oil-cylinder sequence telescopic hydraulic system that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the principle schematic of a kind of embody rule scene of Multi-oil-cylinder sequence telescopic hydraulic system shown in Fig. 1.
Primary component symbol description:
1 first oil cylinder
2 second oil cylinders
3 the 3rd oil cylinders
4 main valves
5 back pressure valves
6 first switch valves
7 selector valves
8 second switch valves
9 the 3rd switch valves
10 one-way valves
11 relief valves
12 Pilot operated check valves
01 oil-feed oil circuit
02 oil return circuit
Embodiment
It should be pointed out that in this part to the description of concrete structure and description order be only saying specific embodiment
Bright, should not be considered as there is any restriction to protection scope of the present invention.In addition, when not conflicting,
Embodiment in this part and the feature in embodiment can combine mutually.
Please refer to Fig. 1 and Fig. 2, below in conjunction with accompanying drawing, the embodiment of the present invention is elaborated.
Shown in composition graphs 1, the Multi-oil-cylinder sequence telescopic hydraulic system of this embodiment comprises the first oil cylinder 1, second oil cylinder 2, the 3rd oil cylinder 3, main valve 4, back pressure valve 5, first switch valve 6, selector valve 7, second switch valve 8, the 3rd switch valve 9, one-way valve 10, relief valve 11 and Pilot operated check valve 12.
In the present embodiment, the first switch valve 6 is preferably 2/2-way valve, namely can be communicated with or disconnect between the first hydraulic fluid port of the first switch valve 6 and the second hydraulic fluid port; Second switch valve 8 and the 3rd switch valve 9 are all preferably two-position three-way valve, and namely the first hydraulic fluid port of second switch valve 8/ the 3rd switch valve 9 can optionally be communicated with in the 3rd hydraulic fluid port with its second hydraulic fluid port; Back pressure valve 5 is preferably one-way valve.
In the present embodiment, main valve 4 is preferably the three-position four-way valve that Median Function is Y type, namely in the first operative state (being left position shown in Fig. 1), the oil inlet P of main valve 4 is communicated in the second actuator port B, oil return inlet T is communicated in the first actuator port A, in a second operative state (being right position shown in Fig. 1), the oil inlet P of main valve 4 is communicated in the first actuator port A, oil return inlet T is communicated in the second actuator port B, under the 3rd working state (being meta shown in Fig. 1), the oil inlet P cut-off of main valve 4, first actuator port A, second actuator port B and oil return inlet T communicate.First actuator port A of main valve 4 and the second actuator port B is connected to the first hydraulic fluid port of second switch valve 8 and the filler opening of back pressure valve 5 respectively, and the oil outlet of back pressure valve 5 is connected to the first hydraulic fluid port of the first switch valve 6.
In the present embodiment, selector valve 7 is preferably hydraulic control valve, and under original operating state (being left position shown in Fig. 1), the oil inlet P of selector valve 7 is communicated in the first actuator port A, oil return inlet T is communicated in the second actuator port B, under another kind of working state (being right position shown in Fig. 1), the oil inlet P of selector valve 7 is communicated in the second actuator port B, and oil return inlet T is communicated in the first actuator port A; The oil inlet P of selector valve 7 and oil return inlet T are connected to the second hydraulic fluid port of second switch valve 8 and the second hydraulic fluid port of the first switch valve 6 respectively, first actuator port A of selector valve 7 and the second actuator port B is connected to the rodless cavity of the second oil cylinder 2 and the rodless cavity of the first oil cylinder 1 respectively, and the hydraulic control of selector valve 7 is terminated at the rodless cavity of the first oil cylinder 1.The rod chamber of the first oil cylinder 1 is connected to the rod chamber of the second oil cylinder 2, and the rod chamber of the first oil cylinder 1 is connected to the first hydraulic fluid port of the first switch valve 6.
3rd hydraulic fluid port of second switch valve 8 is connected to the free filler opening of Pilot operated check valve 12, and the free oil outlet of Pilot operated check valve 12 is connected to the rodless cavity of the 3rd oil cylinder 3, and the hydraulic control of Pilot operated check valve 12 is terminated at the first hydraulic fluid port of the 3rd switch valve 3.The filler opening of one-way valve 10 and the oil outlet of relief valve 11 are all connected to the first hydraulic fluid port of the 3rd switch valve 9, and the oil outlet of one-way valve 10 and the filler opening of relief valve 11 are connected to the rod chamber of the 3rd oil cylinder 3.Second hydraulic fluid port of the 3rd switch valve 9 and the 3rd hydraulic fluid port are connected to the 3rd hydraulic fluid port and the main valve 4 second actuator port B of second switch valve 8 respectively.
Below in conjunction with the working principle of the scene of embody rule shown in Fig. 2 illustratively Multi-oil-cylinder sequence telescopic hydraulic system of above-described embodiment, in addition, for convenience of explanation, main valve 4, first switch valve 6, second switch valve 8 and the 3rd switch valve 9 are solenoid valve, namely main valve 4 has electromagnetic coil DT1 and DT2, first switch valve 6 has electromagnetic coil DT3, second switch valve 8 has electromagnetic coil DT4,3rd switch valve has electromagnetic coil DT5, and the working position obtaining power failure state corresponding of each solenoid valve is shown in Figure 1.To be applied to hoist, hoist is provided with four groups of support oil cylinders, often organize support oil cylinder and include the first cross cylinder (corresponding to the first oil cylinder 1), the second cross cylinder (corresponding to the second oil cylinder 2) and Vertical Cylinders (corresponding to the 3rd oil cylinder 3), the hydraulic system often organizing support oil cylinder all adopts above-mentioned Multi-oil-cylinder sequence telescopic hydraulic system, the oil inlet P of each main valve 4 is connected to oil-feed oil circuit 01 (oil outlet as oil pump), and oil return inlet T is connected to oil return circuit 02 (as fuel tank).The sequential telescopic course of action of the first oil cylinder 1, second oil cylinder 2 and the 3rd oil cylinder 3 is as follows:
One, the first oil cylinder 1, second oil cylinder 2 and the 3rd oil cylinder 3 order are stretched out.
1, controlling electromagnetic coil DT1, DT3 and DT5 obtains electric, electromagnetic coil DT4 dead electricity, main valve 4 works in left position, and the first switch valve 6 and the 3rd switch valve 9 work in right position, second switch valve 8 works in left position, and selector valve 7 is operated in left position (original operating state).Pressure oil from oil-feed oil circuit 01 enters from the P mouth of main valve 4, flows out from B mouth, successively after the T mouth and B mouth of back pressure valve 5, first switch valve 6 and selector valve 7, enters in the rodless cavity of the first oil cylinder 1, the first oil cylinder 1 is stretched out to the right; Because the rod chamber of the first oil cylinder 1 is communicated with the rod chamber of the second oil cylinder 2, and second switch valve 8 (being in left position) is by the rodless cavity locking of the second oil cylinder 2, the oil return of the rod chamber of the first oil cylinder 1 enters through the T mouth of the first switch valve 6, selector valve 7 and B mouth in the rodless cavity of the first oil cylinder 1, thus realizes the stretching out fast of the first oil cylinder 1 (differential stretch out).
2, when the first oil cylinder 1 extend out to low order end, the oil pressure of its rodless cavity raises, the oil pressure of selector valve 7 hydraulic control end increases, the spool promoting selector valve 7 is pushed into the work of right position, the rodless cavity of such first oil cylinder 1 will by second switch valve 8 (being in left position) locking, and pressure oil enters the rodless cavity of the second oil cylinder 2 through the T mouth of selector valve 7 and A mouth, second oil cylinder 2 is stretched out left, the oil return of the rod chamber of the second oil cylinder 2 is through the rod chamber of the first oil cylinder 1, first switch valve 6, the T mouth of selector valve 7 and A mouth enter in the rodless cavity of the second oil cylinder 2, thus realize the stretching out fast of the second oil cylinder 2 (differential stretch out).After stretching out end, control electromagnetic coil DT1 and DT3 dead electricity, main valve 1 is in meta, first switch valve 6 is in left position (disconnection), pressure from oil-feed oil circuit 01 disconnects, selector valve 7 returns to original operating state (left position) under the effect of self spring, now, the rodless cavity of the first oil cylinder 1 is by the first switch valve 6 locking, the rodless cavity of the second oil cylinder 2 is by second switch valve 8 locking, and the rod chamber of the first oil cylinder 1 and the second oil cylinder 2 is by the first switch valve 6 and back pressure valve 5 locking.
3, controlling electromagnetic coil DT2 obtains electric, main valve 4 is operated in right position, from oil-feed oil circuit 01 pressure oil successively after the P mouth of main valve 4 and A mouth, second switch valve 8 (being in left position) and Pilot operated check valve 12, enter in the rodless cavity of the 3rd oil cylinder 3,3rd oil cylinder 3 is stretched out, and the oil return of the 3rd oil cylinder 3 rod chamber is after the pressure overcoming relief valve 11, enter in the rodless cavity of the 3rd oil cylinder 3 through selector valve 8 (being in right position), Pilot operated check valve 12, thus realize the stretching out fast of the 3rd oil cylinder 3 (differential stretch out); If control in advance electromagnetic coil DT5 dead electricity, even if the 3rd switch valve 9 is in left position, then the oil return through the 3rd switch valve 9 flows into from the B mouth of main valve 4 and T mouth in oil return circuit, thus realizes normally stretching out of the 3rd oil cylinder 3.
Two, the 3rd oil cylinder 3, second oil cylinder 2 and the first oil cylinder 1 order are retracted.
4, control electromagnetic coil DT2 dead electricity, DT1 obtains electric, electromagnetic coil DT5 dead electricity, (see above,
Electromagnetic coil DT3 and DT4 also remains on power failure state), main valve 4 is operated in left position, second switch valve 8 and the 3rd switch valve 9 are all operated in left position, pressure oil from oil-feed oil circuit 01 enters in the rod chamber of the 3rd oil cylinder 3 through the P mouth of main valve 4 and B mouth, the 3rd switch valve 9, one-way valve 10 successively, open Pilot operated check valve 12 simultaneously, the oil return of the 3rd oil cylinder 3 rodless cavity enters oil return circuit 02 after the A mouth and T mouth of Pilot operated check valve 12, second switch valve 8, main valve 4, thus realizes the retract action of the 3rd oil cylinder 3; In the process, the pressure oil being entered the rod chamber of the first oil cylinder 1 by main valve 4 through back pressure valve 5 can drive the first oil cylinder 1 or the second oil cylinder 2, but because the rodless cavity of the first oil cylinder 1 and the second oil cylinder 2 is respectively by the first switch valve 6 and second switch valve 8 locking, therefore the first oil cylinder 1 and the second oil cylinder 2 attonity.
5, after the 3rd oil cylinder 3 is retracted, controlling electromagnetic coil DT4 and DT5 obtains electric, (electromagnetic coil DT3 continues to keep power failure state), second switch valve 8 and the 3rd switch valve 9 are all operated in right position, from the pressure oil of oil-feed oil circuit 01 through the P mouth of main valve 4 and B mouth, after back pressure valve 5, enter the rod chamber kind of the first oil cylinder 1 and the second oil cylinder 2, because the rodless cavity of the first oil cylinder 1 is by the first switch valve 6 locking, therefore the first oil cylinder 1 attonity, and the rodless cavity oil return of the second oil cylinder 1 is through the A mouth of selector valve 7 and P mouth, second switch valve 8 (being in right position), enter in oil return circuit 02 after the A mouth of main valve 4 and T mouth, thus realize the retraction of the second oil cylinder 2.
6, after the second oil cylinder 2 is all retracted, the rodless cavity oil pressure of the first oil cylinder 1 will raise, the oil pressure of selector valve 7 hydraulic control end increases, and then overcome own spring force promote spool be operated in right position, thus make the rodless cavity of the second oil cylinder 2 by the first switch valve 6 locking, and the rodless cavity oil return of the first oil cylinder 1 enters in oil return circuit 02 by the A mouth of the B mouth of selector valve 7 and P mouth, second switch valve 8 (being in right position), main valve 4 and T mouth, thus realize the retraction of the first oil cylinder 1.After the first oil cylinder 1 retraction puts in place, control electromagnetic coil DT1 dead electricity, main valve 4 is in meta, and from the distress resolves of oil-feed oil circuit 01, selector valve 7 returns to original operating state (left position) under the effect of self spring; Owing to inputting without pressure, back pressure valve 5 can the rod chamber of locking first oil cylinder 1 and the second oil cylinder 2, the first oil cylinder 1 and the second oil cylinder 2 is avoided to meet accident action (such as, avoiding the first oil cylinder 1 or the second oil cylinder 2 slowly to stretch out under the effect of inertial force in vehicle travel process).
From the foregoing, compared with prior art, the Multi-oil-cylinder sequence telescopic hydraulic system of the embodiment of the present invention can realize the sequential telescopic action of three oil cylinders by employing three switch valves and selector valve 7, arrange and structure simple, without the need to using many complex structures such as group one way sequence valve or hydraulic lock etc., hydraulic element that cost is higher, thus reduce complexity and General Implementing cost; Secondly, can also realize the stretching out fast of each oil cylinder (differential stretch out), that has saved each oil cylinder stretches out the time, improves efficiency; Moreover in the process of sequential telescopic and after sequential telescopic completes, each oil cylinder all can obtain corresponding locking, avoid and occur unexpected flexible situation, thus reliability is high.In addition, selector valve 7 adopts hydraulic control valve, and its status adjustment depends on the rod chamber oil pressure of the first oil cylinder 1, and without the need to manual tune, be swift in response, efficiency is high.In addition, relief valve 11 can avoid the 3rd oil cylinder 3 to be damaged because of the high oil temperature of rod chamber.
It should be noted that, in above-described embodiment, the oil inlet and oil return oil circuit of the 3rd oil cylinder 3 arranges Pilot operated check valve 12, relief valve 11 and one-way valve 10 etc., contribute to the Reliability of Microprocessor of raising the 3rd oil cylinder 3, but in other embodiments, and do not mean that and necessarily arrange, as long as the sequential telescopic of three oil cylinders can be realized.
It should be noted that, in above-mentioned various embodiment, the first switch valve 6 adopts 2/2-way valve, second switch valve 8 and the 3rd switch valve 9 adopt two-position three-way valve, but in other embodiments, each switch valve also can adopt other forms, as long as the sequential telescopic of each oil cylinder can be realized.
It should be noted that, in above-mentioned various embodiment, the sequential telescopic of three oil cylinders can be realized simultaneously, but in other embodiments, also only can realize the sequential telescopic of two oil cylinders, such as, the 3rd oil cylinder 3 and relevant hydraulic element (as the 3rd switch valve 9, Pilot operated check valve 12, relief valve 11 and one-way valve 10) thereof can be omitted, the scheme of such formation can realize the sequential telescopic control of the first oil cylinder 1 and the second oil cylinder 2, and can ensure reliability.
It should be noted that, in above-mentioned various embodiment, selector valve 7 preferably adopts two four-way hydraulic control valve, it is condition controlled in the rodless cavity oil pressure of the first oil cylinder 1, but in other embodiments, selector valve 7 also can adopt other forms, and is not limited to hydraulic control mode, as long as alternately commutating of the first oil cylinder 1 rodless cavity and the second oil cylinder 2 rodless cavity can be realized, so also function of the present invention can be realized.
It should be noted that, in above-mentioned various embodiment, main valve 4 preferably Median Function is the three-position four-way valve of Y type, but in other embodiments, can also adopt other forms, such as Median Function is the three-position four-way valve of H type, as long as can realize function of the present invention.Other embodiments of the invention additionally provide a kind of engineering machinery, such as hoist, and this project machinery is provided with support leg hydraulic system, and this support leg hydraulic system adopts the Multi-oil-cylinder sequence telescopic hydraulic system described in above-described embodiment.Because above-mentioned Multi-oil-cylinder sequence telescopic hydraulic system has above-mentioned technique effect, therefore, this project machinery also should possess corresponding technique effect, the specific implementation process of its appropriate section is similar to the above embodiments, the specific implementation process of other parts see the associated description of prior art, hereby can not repeat.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a Multi-oil-cylinder sequence telescopic hydraulic system, comprises main valve (4), the first oil cylinder (1) and the second oil cylinder (2), it is characterized in that, also comprises the first switch valve (6), second switch valve (8) and selector valve (7), wherein:
First actuator port of described main valve (4) and the second actuator port are connected to the first hydraulic fluid port of described second switch valve (8) and the first hydraulic fluid port of described first switch valve (6) respectively;
The filler opening of described selector valve (7) and return opening are connected to the second hydraulic fluid port of described second switch valve (8) and the second hydraulic fluid port of described first switch valve (6) respectively, and the first actuator port of described selector valve (7) and the second actuator port are connected to the rodless cavity of described second oil cylinder (2) and the rodless cavity of described first oil cylinder (1) respectively;
The rod chamber of described first oil cylinder (1) is connected to the rod chamber of described second oil cylinder (2), and the rod chamber of described first oil cylinder (1) is connected to the first hydraulic fluid port of described first switch valve (6) or is connected to the second actuator port of described main valve (4).
2. Multi-oil-cylinder sequence telescopic hydraulic system as claimed in claim 1, it is characterized in that, also comprise back pressure valve (5), described back pressure valve (5) is arranged on the oil circuit between the second actuator port of described main valve (4) and the first hydraulic fluid port of described first switch valve (6).
3. Multi-oil-cylinder sequence telescopic hydraulic system as claimed in claim 1, it is characterized in that, described selector valve (7) is hydraulic control valve.
4. Multi-oil-cylinder sequence telescopic hydraulic system as claimed in claim 3, it is characterized in that, the hydraulic control of described selector valve (7) is terminated at the rodless cavity of described first oil cylinder (1), under original operating state, the filler opening of described selector valve (7) is communicated in the first actuator port, and return opening is communicated in the second actuator port, under another kind of working state, the filler opening of described selector valve (7) is communicated in the second actuator port, and return opening is communicated in the first actuator port.
5. Multi-oil-cylinder sequence telescopic hydraulic system as claimed in claim 1, is characterized in that, described main valve (4) for Median Function be the three-position four-way valve of Y type or H type.
6. the Multi-oil-cylinder sequence telescopic hydraulic system as described in any one of claim 1 to 5, is characterized in that, also comprises the 3rd oil cylinder (3) and the 3rd switch valve (9); Described second switch valve (8) and described 3rd switch valve (9) are two-position three-way valve; 3rd hydraulic fluid port of described second switch valve (8) is connected to the rodless cavity of described 3rd oil cylinder (3), the rod chamber of described 3rd oil cylinder (3) is connected to the first hydraulic fluid port of described 3rd switch valve (9), and the second hydraulic fluid port and the 3rd hydraulic fluid port of described 3rd switch valve (9) are connected to the 3rd hydraulic fluid port of described second switch valve (8) and the second actuator port of described main valve (4) respectively.
7. Multi-oil-cylinder sequence telescopic hydraulic system as claimed in claim 6, it is characterized in that, also comprise the Pilot operated check valve (12) on the oil circuit that is arranged between described second switch valve (8) and described 3rd oil cylinder (3), the free filler opening of described Pilot operated check valve (12) is connected to the 3rd hydraulic fluid port of described second switch valve (8), the free oil outlet of described Pilot operated check valve (12) is connected to the rodless cavity of described 3rd oil cylinder (3), and the hydraulic control of described Pilot operated check valve (12) is terminated at the first hydraulic fluid port of described 3rd switch valve (9).
8. Multi-oil-cylinder sequence telescopic hydraulic system as claimed in claim 7, it is characterized in that, also comprise the one-way valve (10) on the oil circuit that is arranged between described 3rd switch valve (9) and described 3rd oil cylinder (3) and relief valve (11), the filler opening of described one-way valve (10) and the oil outlet of described relief valve (11) are connected to the first hydraulic fluid port of described 3rd switch valve (9), and the oil outlet of described one-way valve (10) and the filler opening of described relief valve (11) are connected to the rod chamber of described 3rd oil cylinder (3).
9. an engineering machinery, is provided with support leg hydraulic system, it is characterized in that, described support leg hydraulic system is the Multi-oil-cylinder sequence telescopic hydraulic system described in any one of claim 1 to 8.
10. engineering machinery as claimed in claim 9, it is characterized in that, described engineering machinery is hoist.
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| CN201310313783.4A CN103423221B (en) | 2013-07-24 | 2013-07-24 | Multi-oil-cylinder sequence telescopic hydraulic system and engineering machinery |
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