CN203532390U - Hydraulic cylinder quick motion loop and engineering machine - Google Patents

Hydraulic cylinder quick motion loop and engineering machine Download PDF

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Publication number
CN203532390U
CN203532390U CN201320685561.0U CN201320685561U CN203532390U CN 203532390 U CN203532390 U CN 203532390U CN 201320685561 U CN201320685561 U CN 201320685561U CN 203532390 U CN203532390 U CN 203532390U
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CN
China
Prior art keywords
oil
valve
hydraulic cylinder
pressure
differential
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Expired - Fee Related
Application number
CN201320685561.0U
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Chinese (zh)
Inventor
肖敏
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Zoomlion Heavy Industry Science and Technology Co Ltd
Changsha Zoomlion Fire Fighting Machinery Co Ltd
Original Assignee
Zoomlion Heavy Industry Science and Technology Co Ltd
Changsha Zoomlion Fire Fighting Machinery Co Ltd
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Application filed by Zoomlion Heavy Industry Science and Technology Co Ltd, Changsha Zoomlion Fire Fighting Machinery Co Ltd filed Critical Zoomlion Heavy Industry Science and Technology Co Ltd
Priority to CN201320685561.0U priority Critical patent/CN203532390U/en
Application granted granted Critical
Publication of CN203532390U publication Critical patent/CN203532390U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model discloses a hydraulic cylinder quick motion loop. The hydraulic cylinder quick motion loop comprises an oil inlet oil way, an oil return oil way, a first working oil way (1), a second working oil way (2), a reversing valve and a hydraulic cylinder (3). The oil inlet and the oil outlet of the reversing valve are connected with the oil inlet oil way and the oil return oil way respectively, the first working oil port of the reversing valve is connected with the rodless cavity of the hydraulic cylinder through the first working oil way, the second working oil port of the reversing valve is connected with the rod cavity of the hydraulic cylinder; the second working oil way is provided with a first pressure control on-off valve. The hydraulic cylinder quick motion loop also comprises a differential motion oil way (4), and the differential motion oil way (4) is connected between the rod cavity and the rodless cavity and provided with a second pressure control on-off valve. The utility model also discloses an engineering machine comprising the hydraulic cylinder quick motion loop. By means of the scheme above, a differential motion loop can be formed between the rod cavity and the rodless cavity, so that rapid extension of a piston rod can be achieved.

Description

Oil hydraulic cylinder quick acting loop and engineering machinery
Technical field
The utility model relates to engineering machinery field, particularly, and the engineering machinery that relates to a kind of oil hydraulic cylinder quick acting loop and there is this oil hydraulic cylinder quick acting loop.
Background technique
Engineering machinery vehicle is for guaranteeing its stability in whole working procedure, conventionally with supporting leg, support car load, and supporting leg generally drives by the landing leg hydraulic cylinder of vertical layout, for guaranteeing that landing leg hydraulic cylinder has enough ouput forces, oil cylinder cylinder diameter is conventionally larger.
Fig. 1 is the hydraulic schematic diagram that the landing leg hydraulic cylinder of prior art drives loop.This landing leg hydraulic cylinder drives loop to comprise oil-feed oil circuit, oil return circuit, the first working oil path 1, the second working oil path 2, selector valve and oil hydraulic cylinder 3, the filler opening of described selector valve is connected with oil return circuit with described oil-feed oil circuit respectively with return opening, the first actuator port of described selector valve is connected with the rodless cavity of described oil hydraulic cylinder 3 by described the first working oil path 1, the second actuator port of described selector valve is connected with the rod chamber of described oil hydraulic cylinder 3 by described the second working oil path 2, in described the first working oil path 1 and the second working oil path 2, be respectively arranged with Pilot operated check valve 9, 10, wherein, the control port of Pilot operated check valve 9 is connected with the second working oil path 2, the control port of Pilot operated check valve 10 is connected with the first working oil path 1.
When pressure oil enters from the first working oil path 1, pressure oil enters oil cylinder rodless cavity through Pilot operated check valve 9, the pressure of the first working oil path 1 arrives Pilot operated check valve 10 simultaneously, it is oppositely opened, the fluid of cylinder rod chamber, through Pilot operated check valve 10 oil sump tanks, has been realized the extend action of oil cylinder with this.The retract action of oil cylinder is also same principle: pressure oil enters from the second working oil path 2, through Pilot operated check valve 10, enter cylinder rod chamber, the pressure at the second working oil path 2 places arrives Pilot operated check valve 9 simultaneously, and it is oppositely opened, and the fluid of oil cylinder rodless cavity is through Pilot operated check valve 9 oil sump tanks.When the first working oil path 1 and the second working oil path 2 are during all without pressure oil, Pilot operated check valve 9,10 all can not oppositely be opened, and oil cylinder is lockable, the position when remaining on pressure oil and being cut off.
In the prior art, because the cylinder diameter of landing leg hydraulic cylinder is larger, in the situation that oil pump (not shown) flow is limited, the oil cylinder speed that cylinder diameter is large is slow.In the situation that speed is had to requirement, prior art can only strengthen oil pump flow.And oil pump flow is mainly determined by the main operating mode of system, for strengthening oil pump flow, supporting leg speed can increase cost separately, and unreasonable.
Model utility content
The purpose of this utility model is to provide a kind of oil hydraulic cylinder quick acting loop, and stretching out fast of hydraulic cylinder piston rod can be realized in this oil hydraulic cylinder quick acting loop.
To achieve these goals, the utility model provides a kind of oil hydraulic cylinder quick acting loop, comprise oil-feed oil circuit, oil return circuit, the first working oil path, the second working oil path, selector valve and oil hydraulic cylinder, the filler opening of described selector valve is connected with oil return circuit with described oil-feed oil circuit respectively with return opening, the first actuator port of described selector valve is connected with the rodless cavity of described oil hydraulic cylinder by described the first working oil path, the second actuator port of described selector valve is connected with the rod chamber of described oil hydraulic cylinder by described the second working oil path, wherein, described the second working oil path is provided with and can is controlled and be opened the first pressure control on-off valve of closing by oil pressure, and described oil hydraulic cylinder quick acting loop also comprises differential oil line, this differential oil line is connected between described rodless cavity and rod chamber, and described differential oil line is provided with and can is controlled and be opened second pressure of closing and control on-off valve by oil pressure.
Preferably, described the second pressure is controlled on-off valve and is comprised one-way valve and differential oil line Pilot operated check valve, the forward port of this one-way valve is connected in described rod chamber, to allow hydraulic oil to flow into described rodless cavity from described rod chamber when oil pressure reaches the forward conduction cracking pressure of this one-way valve, and the setting party of described differential oil line Pilot operated check valve on described differential oil line is to contrary with described one-way valve, and the control port of described differential oil line Pilot operated check valve is connected with described the first working oil path.
Preferably, described the second pressure is controlled on-off valve and is comprised one-way valve and differential oil line equilibrium valve, the forward port of this one-way valve is connected in described rod chamber, to allow hydraulic oil to flow into described rodless cavity from described rod chamber when oil pressure reaches the forward conduction cracking pressure of this one-way valve, and the reverse port of the one-way valve in described differential oil line equilibrium valve is connected in described rod chamber, the control port of described differential oil line equilibrium valve is connected with described the first working oil path.
Preferably, it is equilibrium valve that described the first pressure is controlled on-off valve, the control port of this equilibrium valve is connected in described the first working oil path, and the reverse port of the one-way valve in this equilibrium valve is connected in described rod chamber, the forward conduction cracking pressure of the described one-way valve on wherein said differential oil line and the hydraulic control cracking pressure of described differential oil line Pilot operated check valve are all less than the hydraulic control cracking pressure of described equilibrium valve, and described the first working oil path can drive the piston rod of described oil hydraulic cylinder unloaded or carry predetermined load and stretch out when reaching the described one-way valve that makes on described differential oil line and the equal conducting of described differential oil line Pilot operated check valve to described rodless cavity oil-feed and oil pressure.
Preferably, it is locking Pilot operated check valve that described the first pressure is controlled on-off valve, this locking is connected in described the first working oil path with the control port of Pilot operated check valve, and described locking is connected in described rod chamber by the reverse port of Pilot operated check valve, the forward conduction cracking pressure of wherein said one-way valve and the hydraulic control cracking pressure of described differential oil line Pilot operated check valve are all less than the hydraulic control cracking pressure of Pilot operated check valve for described locking, and described the first working oil path can drive while making described one-way valve and the equal conducting of described differential oil line Pilot operated check valve the piston rod of described oil hydraulic cylinder unloaded or carry predetermined load and stretch out reaching to described rodless cavity oil-feed and oil pressure.
Preferably, be provided with anti-oil return Pilot operated check valve in described the first working oil path, this anti-oil return is connected with described the second working oil path with the control port of Pilot operated check valve.
Preferably, one end of described differential oil line is connected in described the first working oil path, the other end be connected to described the second working oil path in the oil circuit part between described rod chamber and described the first pressure on-off control valve.
Preferably, described selector valve is three position four-way directional control valve.
Preferably, described oil hydraulic cylinder for vertically arrange for driving the landing leg hydraulic cylinder of engineering machinery.
The utility model also provides a kind of engineering machinery, and this project machinery comprises oil hydraulic cylinder quick acting as above loop.
Pass through technique scheme, stretching out in process of hydraulic cylinder piston rod, control the first pressure and control that on-off valve is closed, the second pressure is controlled on-off valve and opened, make hydraulic oil from the first working oil path, enter the rodless cavity of oil hydraulic cylinder, and fluid in rod chamber enters in rodless cavity through differential oil line, thereby between rodless cavity and rod chamber, by differential oil line, form hydraulic oil path, supplement the hydraulic oil in rodless cavity, therefore can realize stretching out fast of piston rod.
Other feature and advantage of the present utility model partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is the hydraulic schematic diagram that the landing leg hydraulic cylinder of prior art drives loop;
Fig. 2 is according to the hydraulic schematic diagram in the oil hydraulic cylinder quick acting loop of a kind of mode of execution of the present utility model.
Description of reference numerals
1 first working oil path 2 second working oil path 3 oil hydraulic cylinders
4 differential oil line 5 one-way valve 6 differential oil line Pilot operated check valves
7 equilibrium valves 8 Pilot operated check valve 9,10 Pilot operated check valves for anti-oil return
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
The utility model provides a kind of oil hydraulic cylinder quick acting loop on the one hand, comprise oil-feed oil circuit, oil return circuit, the first working oil path 1, the second working oil path 2, selector valve (not shown) and oil hydraulic cylinder 3, the filler opening of described selector valve is connected with oil return circuit with described oil-feed oil circuit respectively with return opening, the first actuator port of described selector valve is connected with the rodless cavity of described oil hydraulic cylinder 3 by described the first working oil path 1, the second actuator port of described selector valve is connected with the rod chamber of described oil hydraulic cylinder 3 by described the second working oil path 2, wherein, described the second working oil path 2 is provided with and can is controlled and be opened the first pressure control on-off valve of closing by oil pressure, and described oil hydraulic cylinder quick acting loop also comprises differential oil line 4, this differential oil line 4 is connected between described rodless cavity and rod chamber, and described differential oil line 4 is provided with and can is controlled and be opened second pressure of closing and control on-off valve by oil pressure.
Pass through such scheme, piston rod at oil hydraulic cylinder 3 stretches out in process, control the first pressure and control that on-off valve is closed, the second pressure is controlled on-off valve and opened, make hydraulic oil from the first working oil path 1, enter the rodless cavity of oil hydraulic cylinder, and fluid in rod chamber also enters in rodless cavity through differential oil line 4, thereby between rodless cavity and rod chamber, by differential oil line 4, form hydraulic oil path, supplement the hydraulic oil in rodless cavity, therefore can realize stretching out fast of piston rod.
The second pressure is controlled on-off valve can form various suitable forms, for example, described the second pressure is controlled on-off valve can comprise one-way valve 5 and differential oil line Pilot operated check valve 6, the forward port of this one-way valve 5 is connected in described rod chamber, to allow hydraulic oil to flow into described rodless cavity from described rod chamber when oil pressure reaches the forward conduction cracking pressure of this one-way valve 5, and the setting party of described differential oil line Pilot operated check valve 6 on described differential oil line 4 is to contrary with described one-way valve 5, the control port of described differential oil line Pilot operated check valve 6 is connected with described the first working oil path 1.
In this embodiment, at piston rod, stretch out in process, hydraulic oil enters rodless cavity from the first working oil path 1, the pressure at the first working oil path 1 place arrives differential oil line Pilot operated check valve 6 simultaneously, it is oppositely opened, thereby the fluid in rod chamber is entered in rodless cavity through differential oil line Pilot operated check valve 6, one-way valve 5.Here, by being set, one-way valve 5 make hydraulic oil to flow to rodless cavity from rod chamber.
As the second pressure, control the another kind of mode of execution of on-off valve, described the second pressure is controlled on-off valve can comprise one-way valve 5 and differential oil line equilibrium valve (not shown), the forward port of this one-way valve 5 is connected in described rod chamber, to allow hydraulic oil to flow into described rodless cavity from described rod chamber when oil pressure reaches the forward conduction cracking pressure of this one-way valve 5, and the reverse port of the one-way valve in described differential oil line equilibrium valve is connected in described rod chamber, the control port of described differential oil line equilibrium valve is connected with described the first working oil path 1.
In this embodiment, at piston rod, stretch out in process, hydraulic oil enters rodless cavity from the first working oil path 1, the pressure at the first working oil path 1 place arrives differential oil line equilibrium valve simultaneously, it is opened, thereby the fluid in rod chamber is entered in rodless cavity through differential oil line equilibrium valve, one-way valve 5.
The first pressure is controlled on-off valve can form various suitable forms, for example, it can be equilibrium valve 7 that described the first pressure is controlled on-off valve, the control port of this equilibrium valve 7 is connected in described the first working oil path 1, and the reverse port of the one-way valve in this equilibrium valve 7 is connected in described rod chamber, the forward conduction cracking pressure of wherein said one-way valve 5 and the hydraulic control cracking pressure of described differential oil line Pilot operated check valve 6 are all less than the hydraulic control cracking pressure of described equilibrium valve 7, and described the first working oil path 1 can drive while making described one-way valve 5 and the 6 equal conducting of described differential oil line Pilot operated check valve the piston rod of described oil hydraulic cylinder unloaded or carry predetermined load and stretch out reaching to described rodless cavity oil-feed and oil pressure.
As the first pressure, control the another kind of mode of execution of on-off valve, it can be locking Pilot operated check valve (not shown) that described the first pressure is controlled on-off valve, this locking is connected in described the first working oil path 1 with the control port of Pilot operated check valve, and described locking is connected in described rod chamber by the reverse port of Pilot operated check valve, the forward conduction cracking pressure of wherein said one-way valve 5 and the hydraulic control cracking pressure of described differential oil line Pilot operated check valve 6 are all less than the hydraulic control cracking pressure of Pilot operated check valve for described locking, and described the first working oil path 1 can drive while making described one-way valve 5 and the 6 equal conducting of described differential oil line Pilot operated check valve the piston rod of described oil hydraulic cylinder unloaded or carry predetermined load and stretch out reaching to described rodless cavity oil-feed and oil pressure.
In sum, the first pressure is controlled on-off valve and is selectively formed equilibrium valve or Pilot operated check valve, and the second pressure control on-off valve equally selectively forms and comprises the valve group of equilibrium valve and one-way valve or form the valve group that comprises Pilot operated check valve and one-way valve.
In the utility model, the first pressure is controlled the setting value A of hydraulic control cracking pressure of on-off valve and the setting value B that the second pressure is controlled the hydraulic control cracking pressure of on-off valve must meet: unloaded or when carrying predetermined load and stretching out at piston rod, the force value at the first working oil path 1 place is more than or equal to described setting value B and is less than described setting value A, thereby making the first pressure control on-off valve closes, make the second pressure control on-off valve simultaneously and open, the fluid in rod chamber flows in rodless cavity by differential oil line 4; When load exceeds predetermined value, the force value at the first working oil path 1 place is more than or equal to described predetermined value A, thereby make the first pressure control on-off valve, opens, and the fluid in rod chamber is got back to fuel tank by the second working oil path 2.
Preferably, be provided with anti-Pilot operated check valve 8 for oil return in described the first working oil path 1, this anti-oil return is connected with described the second working oil path 2 with the control port of Pilot operated check valve 8.When piston rod is retracted, hydraulic oil enters rod chamber through the second working oil path 2, and simultaneously the pressure at the second working oil path 2 places arrives anti-Pilot operated check valve 8 for oil return, it is oppositely opened, thereby in rodless cavity, fluid is through the first working oil path 1 oil sump tank.
Preferably, one end of described differential oil line 4 is connected in described the first working oil path 1, the other end be connected to described the second working oil path 2 in the oil circuit part between described rod chamber and described the first pressure on-off control valve.More preferably, described one end of described differential oil line 4 is connected to using in the oil circuit part between Pilot operated check valve 8 at described rodless cavity and described anti-oil return of described the first working oil path 1.
Selector valve can adopt various forms of selector valves, for example, can adopt three position four-way directional control valve, makes convenient operation and control, and pipeline connects simple.
Oil hydraulic cylinder quick acting of the present utility model loop is applicable to the occasion that the piston rod of various requirement oil hydraulic cylinder stretches out fast, be particularly useful for driving the supporting leg of work mechanism to stretch out fast, that is, preferably, described oil hydraulic cylinder for vertically arrange for driving the landing leg hydraulic cylinder of engineering machinery.
The utility model provides a kind of engineering machinery on the other hand, and this project machinery comprises according to oil hydraulic cylinder quick acting of the present utility model loop.
Below in conjunction with Fig. 2, the landing leg hydraulic cylinder of take, describe according to the working principle in the oil hydraulic cylinder quick acting loop of preferred implementation of the present utility model as example.
When landing leg hydraulic cylinder stretches out, hydraulic oil enters from the first working oil path 1, through anti-oil return, with Pilot operated check valve 8, enter the rodless cavity of landing leg hydraulic cylinder, pressure in the first working oil path 1 arrives differential oil line Pilot operated check valve 6 and equilibrium valve 7, before supporting leg lands, the pressure at the first working oil path 1 place is less, can only make differential oil line Pilot operated check valve 6 open, and can not make equilibrium valve 7 open, therefore the fluid in rod chamber is through differential oil line Pilot operated check valve 6, one-way valve 5 flows in rodless cavity, thereby by differential oil line 4, form hydraulic oil path between rod chamber and rodless cavity, supplement the hydraulic oil in rodless cavity, make landing leg hydraulic cylinder to realize quick acting with small flow.
After supporting leg lands, the pressure in the first working oil path 1 rises to the size that equilibrium valve 7 is opened gradually, and equilibrium valve 7 is opened, and the hydraulic oil in rod chamber is through the second working oil path 2 oil sump tanks.
When landing leg hydraulic cylinder is retracted, hydraulic oil enters from the second working oil path 2, enters rod chamber through equilibrium valve 7, and the pressure in the second working oil path 2 arrives anti-Pilot operated check valve 8 for oil return simultaneously, it is oppositely opened, and the hydraulic oil in rodless cavity is through Pilot operated check valve 8 oil sump tanks for anti-oil return.
When the first working oil path 1 and the second working oil path 2 are during all without hydraulic oil, for anti-oil return, Pilot operated check valve 8, differential oil line Pilot operated check valve 6 can not oppositely be opened, equilibrium valve 7 can not be opened, landing leg hydraulic cylinder is just lockable like this, can not bounce back and can not stretch out, but position when remaining on hydraulic oil and being cut off.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.
In addition, between various mode of execution of the present utility model, also can carry out combination in any, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.

Claims (9)

1. an oil hydraulic cylinder quick acting loop, comprise oil-feed oil circuit, oil return circuit, the first working oil path (1), the second working oil path (2), selector valve and oil hydraulic cylinder (3), the filler opening of described selector valve is connected with oil return circuit with described oil-feed oil circuit respectively with return opening, the first actuator port of described selector valve is connected with the rodless cavity of described oil hydraulic cylinder (3) by described the first working oil path (1), the second actuator port of described selector valve is connected with the rod chamber of described oil hydraulic cylinder (3) by described the second working oil path (2), it is characterized in that
Described the second working oil path (2) is provided with and can is controlled and be opened the first pressure control on-off valve of closing by oil pressure; And described oil hydraulic cylinder quick acting loop also comprises differential oil line (4), this differential oil line (4) is connected between described rodless cavity and rod chamber, and described differential oil line (4) is provided with and can is controlled and be opened the second pressure control on-off valve of closing by oil pressure.
2. oil hydraulic cylinder quick acting according to claim 1 loop, it is characterized in that, described the second pressure is controlled on-off valve and is comprised one-way valve (5) and differential oil line Pilot operated check valve (6), the forward port of this one-way valve (5) is connected in described rod chamber, to allow hydraulic oil to flow into described rodless cavity from described rod chamber when oil pressure reaches the forward conduction cracking pressure of this one-way valve (5), and the setting party of described differential oil line Pilot operated check valve (6) on described differential oil line (4) is to contrary with described one-way valve (5), the control port of described differential oil line Pilot operated check valve (6) is connected with described the first working oil path (1).
3. oil hydraulic cylinder quick acting according to claim 2 loop, it is characterized in that, it is equilibrium valve (7) that described the first pressure is controlled on-off valve, the control port of this equilibrium valve (7) is connected in described the first working oil path (1), and the reverse port of the one-way valve in this equilibrium valve (7) is connected in described rod chamber, the forward conduction cracking pressure of the described one-way valve (5) on wherein said differential oil line (4) and the hydraulic control cracking pressure of described differential oil line Pilot operated check valve (6) are all less than the hydraulic control cracking pressure of described equilibrium valve (7), and described the first working oil path (1) all can drive during conducting the piston rod of described oil hydraulic cylinder unloaded or carry predetermined load and stretch out reaching the described one-way valve (5) that makes on described differential oil line (4) and described differential oil line Pilot operated check valve (6) to described rodless cavity oil-feed and oil pressure.
4. oil hydraulic cylinder quick acting according to claim 2 loop, it is characterized in that, it is locking Pilot operated check valve that described the first pressure is controlled on-off valve, this locking is connected in described the first working oil path (1) with the control port of Pilot operated check valve, and described locking is connected in described rod chamber by the reverse port of Pilot operated check valve, the hydraulic control cracking pressure of the forward conduction cracking pressure of wherein said one-way valve (5) and described differential oil line Pilot operated check valve (6) is all less than the hydraulic control cracking pressure of Pilot operated check valve for described locking, and described the first working oil path (1) is reach the piston rod that makes described one-way valve (5) and described differential oil line Pilot operated check valve (6) all can drive described oil hydraulic cylinder during conducting to described rodless cavity oil-feed and oil pressure unloaded or carry predetermined load and stretch out.
5. oil hydraulic cylinder quick acting according to claim 1 loop, it is characterized in that, in described the first working oil path (1), be provided with anti-Pilot operated check valve (8) for oil return, this anti-for oil return the control port of Pilot operated check valve (8) be connected with described the second working oil path (2).
6. oil hydraulic cylinder quick acting according to claim 1 loop, it is characterized in that, it is upper that one end of described differential oil line (4) is connected to described the first working oil path (1), the other end be connected to described the second working oil path (2) in the oil circuit part between described rod chamber and described the first pressure on-off control valve.
7. oil hydraulic cylinder quick acting according to claim 1 loop, is characterized in that, described selector valve is three position four-way directional control valve.
8. according to the oil hydraulic cylinder quick acting loop described in any one in claim 1 to 7, it is characterized in that, described oil hydraulic cylinder for vertically arrange, for driving the landing leg hydraulic cylinder of the supporting leg of engineering machinery.
9. an engineering machinery, is characterized in that, this project machinery comprises according to the oil hydraulic cylinder quick acting loop described in any one in claim 1 to 8.
CN201320685561.0U 2013-10-31 2013-10-31 Hydraulic cylinder quick motion loop and engineering machine Expired - Fee Related CN203532390U (en)

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Application Number Priority Date Filing Date Title
CN201320685561.0U CN203532390U (en) 2013-10-31 2013-10-31 Hydraulic cylinder quick motion loop and engineering machine

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104828702A (en) * 2014-11-26 2015-08-12 北汽福田汽车股份有限公司 Crane, reversing control system, and oil supply apparatus thereof
CN108180177A (en) * 2017-12-26 2018-06-19 邵立坤 It is a kind of for the hydraulic valve of differential circuit and hydraulic differential circuit
CN108194457A (en) * 2017-12-27 2018-06-22 中联重科股份有限公司 Hydraulic jacking system and derrick crane
CN111022401A (en) * 2019-11-18 2020-04-17 杭州电子科技大学 Bistable soft on-off valve for soft robot and use method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104828702A (en) * 2014-11-26 2015-08-12 北汽福田汽车股份有限公司 Crane, reversing control system, and oil supply apparatus thereof
CN108180177A (en) * 2017-12-26 2018-06-19 邵立坤 It is a kind of for the hydraulic valve of differential circuit and hydraulic differential circuit
CN108194457A (en) * 2017-12-27 2018-06-22 中联重科股份有限公司 Hydraulic jacking system and derrick crane
CN111022401A (en) * 2019-11-18 2020-04-17 杭州电子科技大学 Bistable soft on-off valve for soft robot and use method thereof
CN111022401B (en) * 2019-11-18 2021-08-31 杭州电子科技大学 Bistable soft on-off valve for soft robot and use method thereof

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Granted publication date: 20140409

Termination date: 20181031