CN106762883B - Hydraulic system and tower crane - Google Patents

Hydraulic system and tower crane Download PDF

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Publication number
CN106762883B
CN106762883B CN201611257893.3A CN201611257893A CN106762883B CN 106762883 B CN106762883 B CN 106762883B CN 201611257893 A CN201611257893 A CN 201611257893A CN 106762883 B CN106762883 B CN 106762883B
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CN
China
Prior art keywords
hydraulic
valve
hydraulic cylinder
pressure
load
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CN201611257893.3A
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CN106762883A (en
Inventor
陈青专
向小辉
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Zoomlion Heavy Industry Science and Technology Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors

Abstract

The invention discloses a kind of hydraulic system and tower crane, which includes:Multiple hydraulic cylinders (1);Hydraulic medium organization of supply, the hydraulic medium organization of supply are connected to the rod chamber and rodless cavity of multiple hydraulic cylinders (1) by fluid pressure line;Wherein, the rodless cavity branch road that the hydraulic medium organization of supply is connected to each hydraulic cylinder (1) is equipped with high-pressure balance valve (17), and the control terminal of each high-pressure balance valve (17) is connected to the rod chamber of the corresponding hydraulic cylinder (1), rodless cavity branch road between high-pressure balance valve (17) and hydraulic cylinder (1) is connected with balancing branch, and multiple balancing branchs communicate with each other.Pass through multiple rodless cavity branches of multiple balancing branchs connection equipped with high-pressure balance valve, it can be to balance the pressure in multiple rodless cavity branches when a high-pressure balance valve draining is too fast or excessively slow wherein, the piston rod of multiple hydraulic cylinders is synchronously stretched, stability of the hydraulic cylinder to load support is improved.

Description

Hydraulic system and tower crane
Technical field
The present invention relates to fluid power systems, and in particular, to a kind of hydraulic system and tower crane.
Background technology
In the work progress of heavy construction, large size shows important " building crane " (i.e. tower crane) day.Currently, domestic large-scale " jack-up system " of tower crane is " Multi-cylinder jack-up system " (4 cylinders or 6 cylinders) mostly, i.e., the system is by one " pumping plant " and more " jacking cylinder " forms.
Wherein, during retractable shoulder pole girder, the synchronization accuracy of oil cylinder depends entirely on the precision of " speed governing valve ", can It is not strong by property;And in debugging process, adjusting 8 " speed governing valves " is needed to be mutually matched, it is cumbersome time-consuming.
In tower crane hydraulic jacking system, the installation of hydraulic cylinder is realized mainly by balanced valve (or hydraulic lock), but In the practical operation of Multi-cylinder jack-up system, balanced valve can not solve problems with:
1, when building site has a power failure tower crane suddenly during jacking or decline, tower crane need to be dropped into former peace under power failure Position is filled, to prevent tower crane to be in " suspension " state for a long time;
2, when the balanced valve on an oil cylinder because let out in appearance speed than the Inner of other balanced valves let out speed it is obviously bigger than normal when, It needs other oil cylinders to synchronize to decline;
3, when the balanced valve on an oil cylinder damages suddenly for some reason, the work(for preventing oil cylinder from dropping suddenly is needed Can, other oil cylinder energy automatic synchronizations decline, at the same time it is wished that other in-oil cylinder hydraulic oil can flow back to fuel tank, rather than from damage Ground pollution environment is drained at balanced valve.
4, jacking cylinder the case where there are no-load runnings, i.e. piston rod, complete flexible operation under no load, Each two (or more) end coupling (shoulder pole girder) of piston rod should synchronously stretch (lifting).
5, according to tower crane design specification, in load conditions, decrease speed is not above the rate of climb, however, because of load When decline, oil cylinder " rod chamber " oil inlet declines more faster than rising when oil pump capacity is not restricted, it is therefore desirable in rod chamber Flow when " speed governing valve " limits decline is set in oil circuit.And (when lifting shoulder pole girder, shoulder pole girder is very light, is equivalent to when unloaded It is unloaded), then it requires speed fast, flow should not be limited, the presence of speed governing valve enables the system cannot achieve this function, this When speed governing valve efficiency is not only reduced to the limitation of flow, but also waste power, the energy.
Invention content
The object of the present invention is to provide the hydraulic systems that a kind of multiple hydraulic cylinders are capable of synchronization lifting.
To achieve the goals above, the present invention provides a kind of hydraulic systems, including:Multiple hydraulic cylinders;Hydraulic medium supplies Mechanism is answered, which is connected to the rod chamber and rodless cavity of multiple hydraulic cylinders by fluid pressure line;Its In, the rodless cavity branch road that the hydraulic medium organization of supply is connected to each hydraulic cylinder is equipped with high-pressure balance valve, and And the control terminal of each high-pressure balance valve is connected to the rod chamber of the corresponding hydraulic cylinder, the high-pressure balance valve and institute The rodless cavity branch road stated between hydraulic cylinder is connected with balancing branch, and multiple balancing branchs communicate with each other.
Preferably, each balancing branch is equipped with throttle valve.
Preferably, the throttle valve is orifice plug.
Preferably, the balancing branch is commonly connected to the pressure relief pipe equipped with hand-operated direction valve, so as to selectivity Hydraulic medium is discharged.
Preferably, explosion-proof valve is equipped in the rodless cavity of the hydraulic cylinder, which can be in the feelings more than predetermined pressure difference The hydraulic cylinder self locking is realized under condition, to prevent the piston rod of the hydraulic cylinder from continuing to move to.
Preferably, the fluid pressure line that the hydraulic medium organization of supply is connected to the rod chamber of multiple hydraulic cylinders includes The load pipeline and unloaded pipeline being connected in parallel to each other, the load pipeline and the unloaded pipeline are connected to institute by pilot operated directional control valve Hydraulic medium organization of supply is stated, it is more to be communicated in optionally through one of the load pipeline and the unloaded pipeline The piston rod of a hydraulic cylinder, hydraulic cylinder described at least two of which is connected as one group by connector, to described in every group The piston rod of hydraulic cylinder synchronously stretches, and each of every group of hydraulic cylinder unloaded pipeline includes being connected to each liquid The unloaded branch of the rod chamber of cylinder pressure is connected to by synchronous valve between the unloaded branch of hydraulic cylinder described in every group.
Preferably, the balancing branch is connected with pressure-control valve, which can incude in the rodless cavity Pressure, to control the switching of spool.
Preferably, the load pipeline includes the load branch of multiple rod chambers for being connected to each hydraulic cylinder, each negative It carries branch and is equipped with hydraulic control one-way valve, the pressure-control valve connects and controls the hydraulic control one-way valve.
Preferably, the speed governing valve of control hydraulic medium flow velocity is equipped in the load pipeline.
Preferably, the piston rod of the hydraulic cylinder supports along gravity direction and loads and load is driven to lift upwards.
In addition, the present invention also provides a kind of tower cranes, wherein the tower crane includes the hydraulic pressure system according to above scheme System.
Through the above technical solutions, by multiple rodless cavity branches of multiple balancing branchs connection equipped with high-pressure balance valve, It can be to balance the pressure in multiple rodless cavity branches when a high-pressure balance valve draining is too fast or excessively slow wherein so that multiple liquid The piston rod of cylinder pressure can synchronously stretch, and improve stability of the hydraulic cylinder to load support.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, an and part for constitution instruction, with following tool Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is a kind of schematic diagram of the hydraulic system of embodiment according to the present invention;
Fig. 2 is flow path state of the hydraulic system shown in Fig. 1 in the case where loading propradation;
Fig. 3 is flow path state of the hydraulic system shown in Fig. 1 under a load under drop state;
Fig. 4 is the flow path state that piston stretches out in zero load of hydraulic system shown in Fig. 1;
Fig. 5 is the flow path state that piston is withdrawn in zero load of hydraulic system shown in Fig. 1;
Fig. 6 is the connection diagram of the hydraulic cylinder and connector of the present invention.
Reference sign
1 hydraulic cylinder, 2 hand-operated direction valve
3 synchronous valve, 4 pilot operated directional control valve
5 low-pressure balance valve, 6 reversal valve
7 return filter, 8 motor
9 fuel tank, 10 oil absorption filter
11 oil pump, 12 pressure gauge
13 speed governing valve, 14 hydraulic control one-way valve
15 pressure-control valve, 16 explosion-proof valve
17 high-pressure balance valve, 18 throttle valve
19 connectors
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched The specific implementation mode stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Hereinafter, illustrated hydraulic oil as hydraulic medium, but this, which should not be construed, is limited the scope of the present invention It is fixed.
The present invention provides a kind of hydraulic systems, including:
Multiple hydraulic cylinders 1;Hydraulic medium organization of supply, the hydraulic medium organization of supply are connected to multiple by fluid pressure line The rod chamber and rodless cavity of the hydraulic cylinder 1;Wherein, the hydraulic medium organization of supply is connected to each hydraulic cylinder 1 Rodless cavity branch road is equipped with high-pressure balance valve 17, and the control terminal of each high-pressure balance valve 17 is connected to corresponding institute The rod chamber of hydraulic cylinder 1 is stated, the rodless cavity branch road between the high-pressure balance valve 17 and the hydraulic cylinder 1 is connected with balance branch Road, multiple balancing branchs communicate with each other.
As shown in Figure 1, the hydraulic medium organization of supply include fuel tank 9, oil absorption filter 10, oil pump 11, pressure gauge 12, Motor 8, return filter 7 and reversal valve 6 (having overflow effect), specific connection relation is as shown in the figure, and the hydraulic pressure is situated between Matter organization of supply is device commonly used in the art, is not specially limited herein.
Multiple hydraulic cylinders 1 are connected in parallel to each other, and the rodless cavity branch road for connecting each hydraulic cylinder 1 is equipped with high-pressure balance valve 17, And multiple rodless cavity branches are connected to by multiple balancing branchs, in rodless cavity pipeline oil return, when one of high-pressure balancing Valve 17 because system clean degree reason occur in let out speed than other high-pressure balance valves 17 obviously it is bigger than normal when, balancing branch can be put down Weigh the pressure of multiple rodless cavity branches so that the piston rod of multiple hydraulic cylinders 1 can synchronously decline, and be supported in multiple piston rods Multiple supporting points can be made synchronously to decline when same load, improve stability.
Further, each balancing branch is equipped with throttle valve 18.Balancing branch is mainly to multiple rodless cavity branches Play the role of balance pressure, rather than largely conveying hydraulic medium (hydraulic oil), therefore, setting can play throttling make Throttle valve 18.Preferably, throttle valve 18 can be orifice plug.
In addition, the balancing branch is commonly connected to the pressure relief pipe equipped with hand-operated direction valve 2, so as to selective row Go out hydraulic medium.In the case where the piston rod of hydraulic cylinder 1 is supported by load, when the oil supply system due to the originals such as powering off suddenly When because of fuel cut-off, high-pressure balance valve 17 is disconnected to lock the piston rod of hydraulic cylinder 1.At this point it is possible to open pressure relief pipe manually Hand-operated direction valve 2, so as to by the hydraulic oil in rodless cavity via rodless cavity branch, balancing branch, pressure relief pipe be discharged, The presence of throttle valve 18 can limit the speed of draining well, and pressure relief pipe can be connected to the hydraulic medium organization of supply With the hydraulic oil of recycling discharge.
Further, explosion-proof valve 16 is equipped in the rodless cavity of the hydraulic cylinder 1, which can be more than pre- level pressure The function of 1 self-locking of oil cylinder is realized in the case of difference.In the case where the piston rod of hydraulic cylinder 1 is supported by load, if wherein one The self-locking function of a high-pressure balance valve 17 fails, such as larger leakage or valve body fracture etc., the high-voltage flat damaged at this time occurs Can be considered open circuit at weighing apparatus valve 17,1 supporting role of corresponding hydraulic cylinder is failed (in the case of no explosion-proof valve 16), load for The effect of other hydraulic cylinders 1 suddenly increases and pushes piston rod to be moved to rodless cavity with enormous pressure, and explosion-proof valve 16 opens at this time It moves to lock the position of the piston rod of each hydraulic cylinder 1, wherein the predetermined pressure difference is at least one of which high-pressure balance valve 17 failure when other hydraulic cylinders 1 in rod chamber and rodless cavity pressure difference, this can measure and set as the case may be.
Specifically, the explosion-proof valve 16 has valve chamber and is connected to two ports of valve chamber, and being equipped in the valve chamber can Mobile diskware, the diskware can move more than predetermined pressure difference and block the port as outlet.Anti- In the case that the pressure difference of diskware both sides is not above the predetermined pressure difference in quick-fried valve 16, diskware can ensure two ports it Between, two ports can communicate with each other to allow hydraulic oil to pass through the explosion-proof valve 16;And when the pressure difference of diskware both sides is more than described When predetermined pressure difference, a port is mobile thereto under pressure and blocks the port for the diskware, connects to disconnect pipeline It connects, realizes locking effect.
Further, it is formed with throttle orifice on the diskware, which can be connected to two ports.The throttling Its size of hole is smaller, and after the diskware is by one of port lock, the throttle orifice can allow hydraulic oil is a small amount of to lead to It crosses, i.e., a small amount of hydraulic oil can be allowed to pass through after the locking of explosion-proof valve 16, at this point it is possible to hand-operated direction valve 2 is opened, multiple liquid Hydraulic oil in the rodless cavity of cylinder pressure 1 can slowly be discharged via the pressure relief pipe, and the piston rod of hydraulic cylinder 1 can be slow It retracts on ground so that load slowly declines.
As shown in fig. 6, the piston rod of two hydraulic cylinders 1 is connected by connector 19, connector 19 can be crossbeam, to The piston rod of hydraulic cylinder 1 can synchronously stretch, also, hydraulic cylinder 1 has zero load, at this point, the piston rod only company of support Fitting 19 can be considered as zero load substantially.
In addition, the fluid pressure line that the oil supply system is connected to the rod chamber of multiple hydraulic cylinders 1 includes being connected in parallel to each other Load pipeline and unloaded pipeline, the load pipeline and the zero load pipeline hydraulic medium is connected to by reversal valve 4 Organization of supply, to be communicated in multiple hydraulic pressure optionally through one of the load pipeline and the unloaded pipeline The piston rod of cylinder 1, hydraulic cylinder 1 described at least two of which is connected as one group by connector, to hydraulic cylinder 1 described in every group The piston rod synchronously stretches, and each of every group of hydraulic cylinder 1 unloaded pipeline includes being connected to each hydraulic cylinder 1 The unloaded branch of rod chamber is connected to by synchronous valve 3 between the unloaded branch of hydraulic cylinder 1 described in every group.
Wherein, every group of hydraulic cylinder 1 can be respectively supported at the different location of load, and connector 19 can be the cross of rigidity Beam so that the piston rod synchronization telescope of every group of hydraulic cylinder 1.The load pipeline and the unloaded pipeline are to be connected to rod chamber Oil circuit, and be respectively used under load condition and light condition hydraulic pressure conveying.Particularly, in the unloaded state, piston rod More sensitive for oil pressure, there are the differences of very little to also result in flexible asynchronous of piston rod for pressure difference in different hydraulic cylinders 1, Therefore, it is connected between the unloaded branch of same group of each hydraulic cylinder 1 and is connected to by synchronous valve 3, balanced between unloaded branch Pressure thereby may be ensured that the piston rod of same group of hydraulic cylinder 1 can be with synchronization telescope.
Further, the balancing branch is connected with pressure-control valve 15, which can incude the no bar Pressure in chamber, to control the switching of spool.The pressure-control valve 15 can incude the pressure in the rodless cavity, be changed with control The load pipeline or the unloaded pipeline are selectively communicated with to valve 4.Hydraulic cylinder 1 is under load and light condition in rodless cavity Pressure there are prodigious difference, therefore, can selectively be opened according to the pressure change in rodless cavity by pressure-control valve 15 Load pipeline can be opened for example, when the pressure in rodless cavity is relatively larger by opening load pipeline or the unloaded pipeline, and When pressure in rodless cavity is relatively smaller, unloaded pipeline can be opened.
In addition, the load pipeline includes the load branch of multiple rod chambers for being connected to each hydraulic cylinder 1, it is each to load Branch is equipped with hydraulic control one-way valve 14, and the pressure-control valve 16 connects and controls the connection and disconnection of the hydraulic control one-way valve 14. Here, pressure-control valve 16 can control the opening of load pipeline and unloaded pipeline according to the pressure change of rod chamber, and Load pipeline can control hydraulic control one-way valve 14 when opening.
Further, the speed governing valve 13 of control hydraulic medium flow velocity is equipped in the load pipeline.Speed governing valve 13 can be arranged On the main line of load pipeline.In the loaded state, when loading decline, oil inlet in rod chamber, the decrease speed of load is wanted The significantly greater tnan rate of climb, it is therefore desirable to the decrease speed of load be limited, improve safety, therefore in load pipeline Middle setting speed governing valve 13, limitation load the hydraulic pressure oil flow rate in pipeline.Correspondingly, there is no be arranged for limiting in unloaded pipeline The component of flow velocity can significantly improve the flow velocity of hydraulic oil, avoid waste power output.
Particularly, the piston rod of the hydraulic cylinder 1 supports along gravity direction and loads and load is driven to lift upwards, i.e. hydraulic pressure Cylinder 1 is for jacking and declining load.
As shown in Fig. 2, when the piston rod of hydraulic cylinder 1 jacks load, when " load jacking ", " pressure-control valve 15 " with " hydraulic control one-way valve 14 " experiences oil pressure opening, " pilot operated directional control valve 4 " commutation, and hydraulic oil flows through hydraulic cylinder after high-pressure balance valve 17 After 1 rodless cavity, followed by hydraulic control one-way valve 14, speed governing valve 13, pilot operated directional control valve 4, low-pressure balance valve 5, reversal valve 6, return Oil strainer 7, fuel tank 9.
As shown in figure 3, when the piston rod of hydraulic cylinder 1 declines load, pressure-control valve 15 is experienced with hydraulic control one-way valve 14 Oil pressure is opened, and pilot operated directional control valve 4 commutates, and hydraulic oil is through low-pressure balance valve 5, pilot operated directional control valve 4, speed governing valve 13, hydraulic control one-way valve 14, hydraulic cylinder rod chamber, hydraulic cylinder rodless cavity, high-pressure balance valve 17, reversal valve 6, return filter 10, fuel tank 9.Pass through speed governing Valve 13 adjusts the decrease speed of hydraulic cylinder, and decrease speed is not higher than the function of the rate of climb when realizing load.
As shown in figure 4, when 1 zero load jacking of hydraulic cylinder, since unloaded pressure is small, pressure-control valve 15 and hydraulic control one-way valve 14 It is not switched on, pilot operated directional control valve 4 does not commutate, and hydraulic oil has through low-pressure balance valve 5, pilot operated directional control valve 4, synchronous valve 3, hydraulic cylinder 1 Rod cavity, 1 rodless cavity of hydraulic cylinder, high-pressure balance valve 17, reversal valve 6, return filter 7, fuel tank 9.
As shown in figure 5, when 1 zero load of hydraulic cylinder declines, hydraulic medium flows shown in direction and Fig. 4 on the contrary, herein no longer It is described in detail.
In addition, the present invention also provides a kind of tower cranes, wherein the tower crane includes the hydraulic system described in above scheme. When installing or removing the tower body of tower crane, the multiple hydraulic cylinders 1 of the hydraulic system, which can be used for jacking up or decline, is used as tower body group At the stock of unit, the installation or removal section by section of tower body are realized.
The preferred embodiment of the present invention is described in detail above in association with attached drawing, still, the present invention is not limited to above-mentioned realities The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical scheme of the present invention Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally The thought of invention, it should also be regarded as the disclosure of the present invention.

Claims (10)

1. a kind of hydraulic system, which is characterized in that the hydraulic system includes:
Multiple hydraulic cylinders (1);
Hydraulic medium organization of supply, the hydraulic medium organization of supply are connected to multiple hydraulic cylinders (1) by fluid pressure line Rod chamber and rodless cavity;
Wherein, the hydraulic medium organization of supply is connected to the rodless cavity branch road of each hydraulic cylinder (1) and is equipped with high pressure Balanced valve (17), and the control terminal of each high-pressure balance valve (17) be connected to the corresponding hydraulic cylinder (1) have bar Chamber, the rodless cavity branch road between the high-pressure balance valve (17) and the hydraulic cylinder (1) is connected with balancing branch, multiple described Balancing branch communicates with each other,
Wherein, explosion-proof valve (16) is equipped in the rodless cavity of the hydraulic cylinder (1), which can be more than predetermined pressure difference In the case of realize the hydraulic cylinder (1) self-locking, to prevent the piston rod of the hydraulic cylinder (1) from continuing to move to.
2. hydraulic system according to claim 1, which is characterized in that each balancing branch is equipped with throttle valve (18)。
3. hydraulic system according to claim 2, which is characterized in that the throttle valve (18) is orifice plug.
4. hydraulic system according to claim 2, which is characterized in that the balancing branch is commonly connected to be equipped with and change manually To the pressure relief pipe of valve (2), so as to which hydraulic medium is selectively discharged.
5. hydraulic system according to claim 1, which is characterized in that the hydraulic medium organization of supply is connected to multiple institutes The fluid pressure line for stating the rod chamber of hydraulic cylinder (1) includes the load pipeline that is connected in parallel to each other and unloaded pipeline, the load pipeline with The zero load pipeline is connected to the hydraulic medium organization of supply by pilot operated directional control valve (4), with optionally through described negative It carries one of pipeline and the unloaded pipeline and is communicated in multiple hydraulic cylinders (1), hydraulic cylinder described at least two of which (1) piston rod is connected as one group by connector (19), to which the piston rod of hydraulic cylinder (1) described in every group is synchronously stretched Contracting, the unloaded pipeline of each of hydraulic cylinder (1) described in every group include the sky for the rod chamber for being connected to each hydraulic cylinder (1) Branch is carried, is connected to by synchronous valve (3) between the unloaded branch of hydraulic cylinder (1) described in every group.
6. hydraulic system according to claim 5, which is characterized in that the balancing branch is connected with pressure-control valve (15), which can incude the pressure in the rodless cavity, to control the switching of spool.
7. hydraulic system according to claim 6, which is characterized in that the load pipeline includes multiple being connected to each liquid The load branch of the rod chamber of cylinder pressure (1), each load branch are equipped with hydraulic control one-way valve (14), and the pressure-control valve (15) is even It connects and controls the hydraulic control one-way valve (14).
8. hydraulic system according to claim 5, which is characterized in that be equipped with control hydraulic fluid flow in the load pipeline The speed governing valve (13) of speed.
9. according to the hydraulic system described in any one of claim 1-8, which is characterized in that the piston of the hydraulic cylinder (1) Bar supports along gravity direction and loads and load is driven to lift upwards.
10. a kind of tower crane, which is characterized in that the tower crane includes the hydraulic system according to any one of claim 1-9.
CN201611257893.3A 2016-12-30 2016-12-30 Hydraulic system and tower crane Active CN106762883B (en)

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Application Number Priority Date Filing Date Title
CN201611257893.3A CN106762883B (en) 2016-12-30 2016-12-30 Hydraulic system and tower crane

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Application Number Priority Date Filing Date Title
CN201611257893.3A CN106762883B (en) 2016-12-30 2016-12-30 Hydraulic system and tower crane

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CN106762883B true CN106762883B (en) 2018-07-13

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Publication number Priority date Publication date Assignee Title
CN107859663A (en) * 2017-10-25 2018-03-30 成都弗格森液压机电有限公司 The restraining device of redundant force in a kind of servo hydraulic system
CN108194457B (en) * 2017-12-27 2020-01-10 中联重科股份有限公司 Hydraulic jacking system and tower crane
CN110905890B (en) * 2018-09-14 2021-12-31 湖南双达机电有限责任公司 Continuous pipe injection head tower
CN111056334B (en) * 2019-12-31 2021-10-22 龙合智能装备制造有限公司 Self-adaptive loading platform for integral loading of container

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JP2004316686A (en) * 2003-04-11 2004-11-11 Tcm Corp Hydraulic device for loading vehicle
CN102173363B (en) * 2011-03-02 2013-09-18 中联重科股份有限公司 Jacking structure of tower crane and hydraulic system and jacking method thereof
CN203558742U (en) * 2013-11-25 2014-04-23 无锡起岸重工机械有限公司 Remote hydraulic control system for ship crane
CN104528550B (en) * 2014-12-03 2016-05-11 中联重科股份有限公司 Crane counterweight Hoisting System

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