CN202829383U - Hydraulic system controlling boom to vary amplitude and crane - Google Patents
Hydraulic system controlling boom to vary amplitude and crane Download PDFInfo
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- CN202829383U CN202829383U CN 201220534621 CN201220534621U CN202829383U CN 202829383 U CN202829383 U CN 202829383U CN 201220534621 CN201220534621 CN 201220534621 CN 201220534621 U CN201220534621 U CN 201220534621U CN 202829383 U CN202829383 U CN 202829383U
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Abstract
The utility model discloses a hydraulic system controlling a boom to vary amplitude. The hydraulic system comprises a hydraulic pump, an oil tank, a hand valve and an amplitude varying oil cylinder, wherein a rodless cavity of the amplitude varying oil cylinder is selectively communicated with the hydraulic pump or the oil tank through switching of the hand valve; a rod cavity of the amplitude varying oil cylinder is communicated with the oil tank to achieve raising and descending amplitude variations of the amplitude varying oil cylinder; a balance valve used for controlling the descending amplitude variation process of the amplitude varying oil cylinder is arranged between the rodless cavity and the hand valve; and the hydraulic system comprises a proportional control valve which can proportionally control the balance valve. The utility model also discloses a crane using the hydraulic system provided by the utility model. In the technical scheme in the utility mode, as the hydraulic system provided by the utility model comprises the proportional control valve which proportionally controls the balance valve, the balance valve can be still proportionally controlled under the condition of adopting the hand valve, thus safely completing gravity descending of the boom.
Description
Technical field
The utility model relates to the control field of luffing range of cantilever support, particularly, relates to a kind of hoisting crane of controlling the hydraulic efficiency pressure system of luffing range of cantilever support and using this hydraulic efficiency pressure system.
Background technology
At present, the jib of construction machinery and equipment has driven arm and the arm luffing operation that falls by hydraulic efficiency pressure system, and wherein, for example in the crane arm luffing field of hoisting crane, the arm luffing that falls of jib generally includes dual mode:
The first: be that depended on pressure oil drives amplitude oil cylinder and the power the realized arm that falls, supply pressure oil in the rod chamber of amplitude oil cylinder when namely falling arm is referred to as the power arm that falls.The mode of arm of falling this power all can realize on the car hosit that uses hand valve, pilot operated valve device, electrically-controlled valve.
The second: the gravity of then realizing by the own wt of the arm arm that falls, the rod chamber of amplitude oil cylinder there is no pressure oil when namely falling arm, only need to replenish certain hydraulic oil to this rod chamber, with prevent rod chamber inhale empty, referred to as the gravity arm that falls.
Wherein, adopt pressure oil to carry out the power arm that falls following shortcoming arranged:
1, luffing is opened and is impacted when stopping greatlyr, opens and the impact when stopping can to cause the car load shake, can damage crane arm and amplitude oil cylinder when serious.
The phenomenon that the amplitude oil cylinder bounce-back 2, when luffing stops, can occurring, the luffing bounce-back is exactly when crane arm falls arm, operating personal the lifting toward playing an arm direction that in a flash amplitude oil cylinder after the arm action can be violent that stop to fall, the past direction bullet that rises that at this time whole crane arm also can be violent once, it is longer that crane arm is stretched, and the crane arm head swings up and down larger.Particularly the bounce-back meeting of amplitude oil cylinder causes damage to amplitude oil cylinder, crane arm, turntable, supporting leg when full semi-girder lift heavy, can cause car load to tumble when serious, hangs the serious safety problems such as object carrier falls.
The gravity that adopts gravity the to transfer arm mode that falls then can effectively address the above problem, but uses at present the hoisting crane of hand valve can't realize the mode that gravity is transferred.This is because when falling the arm luffing, can't be effectively controlled for the luffing balance cock that amplitude oil cylinder is fallen to carrying out speed governing, this can cause the action of itself and hand valve finely not mate, thereby so that the uncontrollable probability of the arm luffing that falls raises, even causes safety misadventure.
Therefore, providing a kind of adopts hand valve to carry out the fall hydraulic efficiency pressure system of arm of gravity to have positive effect.
The utility model content
The purpose of this utility model provides a kind of hydraulic efficiency pressure system of controlling luffing range of cantilever support, and this hydraulic efficiency pressure system can adopt hand valve to control the jib arm luffing operation that falls in the fall mode of arm of gravity.
Another purpose of the present utility model provides a kind of hoisting crane, the hydraulic efficiency pressure system that this hoisting crane uses the utility model to provide.
To achieve these goals, the utility model provides a kind of hydraulic efficiency pressure system of controlling luffing range of cantilever support, comprise Hydraulic Pump, fuel tank, hand valve and amplitude oil cylinder, the rodless cavity of described amplitude oil cylinder selectively is communicated with described Hydraulic Pump or described fuel tank by the switching of described hand valve, the rod chamber of described amplitude oil cylinder is communicated with described fuel tank, to realize playing the arm luffing and falling the arm luffing of described amplitude oil cylinder, be provided with the balance cock of controlling for to the arm amplitude changing process that falls of described amplitude oil cylinder between described rodless cavity and the described hand valve, wherein, described hydraulic efficiency pressure system comprises the proportional control valve that can carry out to described balance cock proportional control.
Preferably, described balance cock is guide's balance cock, and described proportional control valve is proportional pressure-reducing valve, and this proportional pressure-reducing valve can be controlled the pressure of the guide oil that supplies to described balance cock in proportion.
Preferably, described proportional control valve and described hand valve link and are controlled by described hand valve.
Preferably, described proportional control valve comprises controlling spring, and this controlling spring is connected with the valve rod of described hand valve and stretches or compress with the motion of institute's valve rod.
Preferably, described proportional control valve is controlled by stretcher.
Preferably, the oil inlet of described proportional control valve is communicated with the oil outlet of described Hydraulic Pump.
Preferably, be provided with back pressure valve between the rod chamber of described amplitude oil cylinder and the described fuel tank.
Preferably, the rod chamber of described amplitude oil cylinder is communicated with described hand valve, and is provided with the by pass valve that is communicated with described fuel tank between described hand valve and rod chamber.
Preferably, described by pass valve is pilot overflow valve, and described hydraulic efficiency pressure system comprises the transfer valve be used to the switching of controlling described by pass valve.
Preferably, described hand valve is three position four-way directional control valve, and the oil inlet of this three position four-way directional control valve is communicated with described Hydraulic Pump, and return opening is communicated with described fuel tank, and the first actuator port is communicated with described rod chamber, and the second actuator port is communicated with described rodless cavity.
According on the other hand of the present utility model, a kind of hoisting crane is provided, this hoisting crane comprises crane arm, and described hoisting crane comprises the hydraulic efficiency pressure system of the control luffing range of cantilever support that the utility model provides, and wherein, described jib is described crane arm.
Pass through technique scheme, since the hydraulic efficiency pressure system that provides of the utility model comprise to balance cock carry out proportional control proportional control valve, therefore guarantee in the situation that adopts hand valve, still can carry out proportional control to balance cock, the arm thereby the gravity of finishing safely jib falls, and so that the hoisting crane that the utility model provides is practical.
Other feature and advantage of the present utility model will partly be described in detail in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide further understanding of the present utility model, and consists of the part of specification sheets, is used from explanation the utility model with the following specific embodiment one, but does not consist of restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the hydraulic efficiency pressure system of the control luffing range of cantilever support that provides of the utility model the first embodiment;
Fig. 2 is the structural representation of the hydraulic efficiency pressure system of the control luffing range of cantilever support that provides of the utility model the second embodiment;
Fig. 3 is the graph of a relation of hand valve stroke and proportional pressure-reducing valve delivery pressure in the utility model preferred implementation;
Fig. 4 is the structural representation of the hydraulic efficiency pressure system of the control luffing range of cantilever support that provides of the utility model the 3rd embodiment.
Description of reference numerals
1 Hydraulic Pump, 2 fuel tanks
3 hand valves, 4 amplitude oil cylinder
5 balance cocks, 6 proportional control valves
7 by pass valves, 8 back pressure valves
9 transfer valves
31 valve rods, 61 controlling springs
62 stretchers
41 rodless cavities, 42 rod chambers
A the first actuator port B the second actuator port
P oil inlet T return opening
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present utility model is elaborated.Should be understood that the specific embodiment described herein only is used for description and interpretation the utility model, is not limited to the utility model.
As shown in Figures 1 to 4, control luffing range of cantilever support in order to realize adopting hand valve in the gravity arm mode that falls, the utility model provides the hydraulic efficiency pressure system of control luffing range of cantilever support, comprising Hydraulic Pump 1, fuel tank 2, hand valve 3 and amplitude oil cylinder 4, wherein the rodless cavity 41 of amplitude oil cylinder 4 selectively is communicated with Hydraulic Pump 1 or fuel tank 2 by the switching of hand valve 3, rod chamber 42 is communicated with fuel tank 2 simultaneously, to realize playing the arm luffing and falling the arm luffing of amplitude oil cylinder 4.Wherein, basic principle provides pressure oil by hand valve 3 for rodless cavity 41 for Hydraulic Pump 1 when playing the arm luffing, rod chamber 42 then gets final product to fuel tank 2 oil returns, and when falling the arm luffing, 41 switchings of passing through hand valve 3 of rodless cavity are to fuel tank 2 oil returns, rod chamber 42 is the basis difference of arm mode that falls then, and degree ground oil-feed gets final product and carry out not.Wherein, in gravity fell the arm mode, rod chamber 42 carries out repairing to be prevented from inhaling sky, and in power fell the arm mode, 42 needs of rod chamber were for pressure oil.Wherein, in preferred implementation of the present utility model, particularly in the second embodiment, the hydraulic efficiency pressure system that provides namely can be carried out the gravity arm that falls can carry out again the power arm that falls.In addition, hand valve 3 can be for being preferably three position four-way directional control valve, and namely by the operation of manual lever, this hand valve 3 can be at meta, switches between left position and the right position, to realize that 4 pairs of jibs of amplitude oil cylinder play arm and the arm luffing that falls.
Particularly, hand valve 3 can be O type Median Function three position four-way directional control valve, and the oil inlet P of this three position four-way directional control valve is communicated with Hydraulic Pump 1, and oil return inlet T is communicated with fuel tank 2, the first actuator port A is communicated with rod chamber 42, and the second actuator port B is communicated with rodless cavity 41.Wherein when this hand valve 3 commutated to right position, rodless cavity 41 fuel feeding of 1 pair of amplitude oil cylinder 4 of Hydraulic Pump, rod chamber 42 were then to fuel tank 2 oil returns, so that amplitude oil cylinder 4 plays the operation of arm luffing.And when hand valve 3 commutates to left when position, then to fuel tank 2 oil returns, the rod chamber 42 then basis arm mode difference that falls is selectively realized the power arm that falls by Hydraulic Pump 1 fuel feeding in the rodless cavity 41, perhaps additional fluid and realize the gravity arm that falls by the gravity of jib only.Those skilled in the art can be understood that; said structure and principle of work are preferred implementation of the present utility model; for other variation that can expect such as the change-over valve that uses other types as hand valve; or the three-position four-way valve that uses other Median Functions realizes function of the present utility model, all should drop in the protection domain of the present utility model.Below in conjunction with accompanying drawing hydraulic efficiency pressure system and the working process thereof that the utility model provides is described in detail.
Wherein in order to realize the purpose of this utility model, namely being implemented in hand valve 3 switches to left when position and can realize the gravity of amplitude oil cylinder 4 arm that falls, be provided with between rodless cavity 41 and the hand valve 3 for the balance cock 5 to amplitude oil cylinder 4 speed governing, and importantly, the hydraulic efficiency pressure system that provides of the utility model comprises the proportional control valve 6 that can carry out to balance cock 5 proportional control.In preferred implementation of the present utility model, for convenient control, the rod chamber 42 of amplitude oil cylinder 4 also is communicated with hand valve 3, and is provided with the by pass valve 7 that is communicated with fuel tank 2 between hand valve 3 and rod chamber 41 in addition.
Therefore, after hand valve 3 switches to left position, the pressure oil that Hydraulic Pump 1 is supplied with from the oil inlet P of hand valve 3 flows back to the trend of fuel tank 1 through generation behind the by pass valve 7 between the first actuator port A of rod chamber 41 and hand valve 3, namely, pressure oil can not supplied in the rod chamber 41 of amplitude oil cylinder 4, the fluid in the rodless cavity 41 of amplitude oil cylinder 4 then leaks in the fuel tank 2 by the second actuator port B and the oil return inlet T of hand valve 3 simultaneously.Thereby the own wt by jib is realized the arm operation that falls of the gravity of amplitude oil cylinder 4.At this moment, along with the piston of amplitude oil cylinder falls, 42 of rod chambers can by vacuum inhale the mode of pressing from the first actuator port A one side and produce oil suction the oil return line that flows back to fuel tank 2 trend, inhale empty phenomenon and can not produce.Wherein be inhaled into rod chamber in order to ensure sufficient fluid, preferably, can between the outlet of by pass valve 7 and fuel tank 2, be provided with back pressure valve 8, thereby make above-mentioned oil return line produce certain back pressure, thereby so that rod chamber 42 can suck sufficient fluid, guarantee transferring smoothly of jib further.Wherein this back pressure valve 8 can adopt check valve to realize.Various structures for the back pressure valve that produces back pressure all should drop in the protection domain of the present utility model.In addition, the mode that adopts rod chamber 42 not to be communicated with hand valve 3 and only be communicated with fuel tank 4, the gravity that also can realize amplitude oil cylinder 4 arm that falls, at this moment, the first actuator port A of hand valve 3 also can be directly by by pass valve to fuel tank 2 oil returns, and rod chamber 42 can be directly from fuel tank 2 oil suction get final product.For this type of distortion, should drop in the protection domain of the present utility model equally.
Mainly, by to being arranged on the control of the balance cock 5 between hand valve 3 and the rodless cavity 41, can carry out the arm amplitude changing process that falls of amplitude oil cylinder such as speed governing, speed limit, the control such as locked, be implemented in jib adopt gravity to fall transferring in the process of arm mode can easy motion and be effectively controlled.As shown in drawings, as a kind of embodiment, balance cock 5 adopts the mode of speed limit hydraulic lock, namely, can comprise the check valve and the external control sequence valve that are connected in parallel, wherein check valve is installed with the direction that allows fluid to flow into the rodless cavity of amplitude oil cylinder, therefore, when needs fall the arm operation, need to by control oil open this check valve can so that fluid flow out from the rodless cavity of amplitude oil cylinder.Therefore by the pressure of this control oil of control, can control the speed limit of whereabouts of 5 pairs of amplitude oil cylinder of this balance cock or locked.In addition other can all can be applied to the utility model by the controlled balance cock that the dropping process of amplitude oil cylinder is controlled of realizing, the utility model does not limit its kind.Therefore wherein, balance cock 5 cooperates most important with the action of hand valve 3.For example, can after hand valve 3 controls stop to fall arm, can in time pass through the control balance cock and locked amplitude oil cylinder, in case have an accident.
Therefore, the utility model is provided with proportional control valve 6, and carry out proportional control by 6 pairs of balance cocks of this proportional control valve 5, thereby can guarantee balance cock 5 can be in time and the switching of hand valve 3 cooperatively interact, the phenomenon of arm etc. that still falls after can not occuring to switch to meta such as hand valve 3 from left position, the process of arm is steady, controlled so that whole gravity falls.
It is multiple to need to prove that the embodiment that can realize technique scheme has, such as the structure of proportional control valve and mode etc., the utility model for convenience of description, in this introduction preferred implementation wherein, this preferred implementation only is used for explanation the utility model, is not limited to the utility model.
Wherein preferably, for convenient control, balance cock 5 is guide's balance cock in the utility model, and proportional control valve 6 is for then being preferably proportional pressure-reducing valve, and this proportional pressure-reducing valve can be controlled the pressure of the guide oil that supplies to balance cock 6 in proportion.Therefore then can realize the ratio adjusting of balance cock 5 guide oil pressure by the aperture of controlling this proportional pressure-reducing valve, wherein this proportional pressure-reducing valve is ratio constant pressure valve, i.e. fixed pressure reducing valve.Then, can carry out proportional control to balance cock 6, thereby so that the motion of amplitude oil cylinder 4 in the dropping process of jib is steady, controlled.Except using reducing valve; can also use other pressure-gradient control valves such as by pass valve, sequence valve to realize the ratio adjusting of the guide oil pressure of balance cock 5 in some permission situation, other distortion that can expect for those skilled in the art drop in the protection domain of the present utility model equally.
Therefore, the control that can find out Comparative Examples control cock 6 is most important, to realize key of the present utility model, therefore as a kind of preferred implementation, as depicted in figs. 1 and 2, proportional control valve 6 by hand valve 3 control and more preferably this proportional control valve 6 can with hand valve 3 interlocks, guarantee better that namely the action of this apportioning valve and the action of hand valve 3 are complementary.Wherein preferably, proportional control valve 6 comprises controlling spring 61, and this controlling spring 61 is connected with the valve rod 31 of hand valve 3 and stretches or compress with the motion of institute's valve rod 31." the stretching or compression " of adopting is the different control modes that adopts when proportional control valve 6 adopts different structure herein, namely by different designs, this proportional control valve 6 both can also can have been realized by the compression of controlling spring 61 by the stretching of controlling spring 61 regulation of proportional pressure-reducing valve.The utility model does not limit this type of change.Therefore, the stretching by controlling spring 61 or compression all can control ratio control cock 6 aperture of proportional pressure-reducing valve especially, thereby can proportional control balance cock 5 guide oils.Particularly; as shown in Figure 3; shown in preferred implementation of the present utility model; the proportionate relationship of the pressure of the guide oil of the valve rod travel of hand valve 3 and proportional pressure-reducing valve output; certainly adopt other designs can access different proportionate relationship lines, these changes all should drop in the protection domain of the present utility model.
In addition, guide's fluid of control balance cock 6 can be obtained by various ways, for example as shown in Figure 1 and Figure 4, be not subjected to the interference of miscellaneous part for the independence that guarantees guide's oil circuit, the oil inlet of proportional control valve 6 preferably can with independently control oil sources and be communicated with, normally, this control oil sources can provide 3 to 5Mpa guide oil to get final product.In addition, for the practicality that provides simple in structure, as shown in Figure 2, the oil inlet of proportional control valve 6 also preferably can be communicated with the oil outlet of Hydraulic Pump 1.It is the guide oil that Hydraulic Pump 1 provides control balance cock 5.In addition, for purity and the precision that guarantees guide oil can also arrange oil filter in above-mentioned guide's oil circuit, all should drop in the protection domain of the present utility model for this type of change.
In three kinds of embodiments that utility model provides, wherein Fig. 1 and the first and the 3rd embodiment shown in Figure 4 are merely able to realize the gravity arm mode that falls.This is because in the situation that by pass valve 7 exists, the pressure oil generation that is provided by Hydraulic Pump 1 has the trend that flows back to fuel tank, and the pressure of the arm that can not fall to the rod chamber generation power of amplitude oil cylinder 4.Therefore, in order on basis of the present utility model, can also to realize the fall mode of arm of power, in the second embodiment that the utility model provides, as shown in Figure 2, preferably, by pass valve 7 can be pilot overflow valve, and hydraulic efficiency pressure system comprises the transfer valve 9 for the switching of controlling water kick valve 7.Particularly, this transfer valve 9 is electromagnetic switch valve, and can so that the remote control orifice of by pass valve 7 can be disconnected to be communicated with fuel tank 2, when transfer valve 9 the control port of by pass valve 7 can be closed when electric, it is communicated with fuel tank 2 disconnections, thereby makes it can not play relief function, namely, by pass valve 7 is closed, thereby so that rod chamber 42 can obtain pressure oil from Hydraulic Pump 1, realize that then amplitude oil cylinder 4 is with the power whereabouts that the arm mode realizes jib that falls.And after transfer valve 9 dead electricity, the remote control orifice of then opening by pass valve 7 makes it be communicated with fuel tank 2, then open by pass valve 7, thereby so that the pressure oil of supplying with from Hydraulic Pump 1 produces the trend that flows back to fuel tank, namely, can not produce power to rod chamber 42, realize transferring of jib to realize amplitude oil cylinder in the fall mode of arm of gravity.
In addition, the hydraulic efficiency pressure system of the control luffing range of cantilever support that the utility model provides can be applicable to for example in the hoisting crane that the utility model provides, can use the crane arm of this this hoisting crane of HYDRAULIC CONTROL SYSTEM in the construction machinery and equipment that various needs carry out luffing range of cantilever support.The utility model does not limit its application, all should drop in the protection domain of the present utility model for this type of distortion.
To sum up, the hydraulic efficiency pressure system of the control luffing range of cantilever support that the utility model provides can either realize that the power arm that falls can realize again the gravity arm that falls so that the construction machinery and equipment that uses this hydraulic efficiency pressure system for example the hoisting crane that provides of the utility model have higher practicality and promotional value.
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 the above-mentioned embodiment; in technical conceive scope 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.
Need to prove in addition, each concrete technical characterictic described in the above-mentioned specific embodiment in reconcilable situation, can make up by any suitable mode, for fear of unnecessary repetition, the utility model is to the no longer separately explanation of various possible array modes.
In addition, also can carry out combination in any between the various embodiment of the present utility model, 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 (11)
1. hydraulic efficiency pressure system of controlling luffing range of cantilever support, comprise Hydraulic Pump (1), fuel tank (2), hand valve (3) and amplitude oil cylinder (4), the rodless cavity (41) of described amplitude oil cylinder (4) selectively is communicated with described Hydraulic Pump (1) or described fuel tank (2) by the switching of described hand valve (3), the rod chamber (42) of described amplitude oil cylinder (4) is communicated with described fuel tank (2), to realize playing the arm luffing and falling the arm luffing of described amplitude oil cylinder (4), be provided with the balance cock (5) of controlling for to the arm amplitude changing process that falls of described amplitude oil cylinder (4) between described rodless cavity (41) and the described hand valve (3), it is characterized in that described hydraulic efficiency pressure system comprises the proportional control valve (6) that can carry out to described balance cock (5) proportional control.
2. hydraulic efficiency pressure system according to claim 1, it is characterized in that, described balance cock (5) is guide's balance cock, and described proportional control valve (6) is proportional pressure-reducing valve, and this proportional pressure-reducing valve can be controlled the pressure of the guide oil that supplies to described balance cock (5) in proportion.
3. hydraulic efficiency pressure system according to claim 1 and 2 is characterized in that, described proportional control valve (6) is controlled with described hand valve (3) interlock and by described hand valve (3).
4. hydraulic efficiency pressure system according to claim 3, it is characterized in that, described proportional control valve (6) comprises controlling spring (61), and this controlling spring (61) is connected with the valve rod (31) of described hand valve (3) and stretches or compress with the motion of institute's valve rod (31).
5. hydraulic efficiency pressure system according to claim 1 and 2 is characterized in that, described proportional control valve (6) is controlled by stretcher (62).
6. hydraulic efficiency pressure system according to claim 2 is characterized in that, the oil inlet of described proportional control valve (6) is communicated with the oil outlet of described Hydraulic Pump (1).
7. hydraulic efficiency pressure system according to claim 1 and 2 is characterized in that, is provided with back pressure valve (8) between the rod chamber (42) of described amplitude oil cylinder (4) and the described fuel tank (2).
8. hydraulic efficiency pressure system according to claim 1 and 2, it is characterized in that, the rod chamber (42) of described amplitude oil cylinder (4) is communicated with described hand valve (3), and is provided with the by pass valve (7) that is communicated with described fuel tank (2) between described hand valve (3) and rod chamber (42).
9. hydraulic efficiency pressure system according to claim 8 is characterized in that, described by pass valve (7) is pilot overflow valve, and described hydraulic efficiency pressure system comprises the transfer valve (9) be used to the switching of controlling described by pass valve (7).
According to claim 1 and 2 in the described hydraulic efficiency pressure system of any one, it is characterized in that, described hand valve (3) is three position four-way directional control valve, the oil inlet of this three position four-way directional control valve (P) is communicated with described Hydraulic Pump (1), return opening (T) is communicated with described fuel tank (2), the first actuator port (A) is communicated with described rod chamber (42), and the second actuator port (B) is communicated with described rodless cavity (41).
11. a hoisting crane, this hoisting crane comprises crane arm, it is characterized in that, described hoisting crane comprises the hydraulic efficiency pressure system of the described control luffing range of cantilever support of claim 1-10, and wherein, described jib is described crane arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220534621 CN202829383U (en) | 2012-10-18 | 2012-10-18 | Hydraulic system controlling boom to vary amplitude and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220534621 CN202829383U (en) | 2012-10-18 | 2012-10-18 | Hydraulic system controlling boom to vary amplitude and crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202829383U true CN202829383U (en) | 2013-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220534621 Withdrawn - After Issue CN202829383U (en) | 2012-10-18 | 2012-10-18 | Hydraulic system controlling boom to vary amplitude and crane |
Country Status (1)
| Country | Link |
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| CN (1) | CN202829383U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102874697A (en) * | 2012-10-18 | 2013-01-16 | 中联重科股份有限公司 | Hydraulic system for controlling amplitude variation of arm support and crane |
| CN104528555A (en) * | 2014-12-19 | 2015-04-22 | 中联重科股份有限公司 | Main arm variable amplitude controlling system for crane and crane |
| CN107934807A (en) * | 2017-12-28 | 2018-04-20 | 徐工集团工程机械有限公司 | The variable amplitude hydraulic system and lorry-mounted crane of crane |
| CN113700687A (en) * | 2021-08-06 | 2021-11-26 | 中际联合（北京）科技股份有限公司 | Hydraulic amplitude changing system of crane and offshore crane |
| WO2023134041A1 (en) * | 2022-01-17 | 2023-07-20 | 湖南星邦智能装备股份有限公司 | Control method for controlling retraction of boom, system, mechanical device and storage medium |
-
2012
- 2012-10-18 CN CN 201220534621 patent/CN202829383U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102874697A (en) * | 2012-10-18 | 2013-01-16 | 中联重科股份有限公司 | Hydraulic system for controlling amplitude variation of arm support and crane |
| CN102874697B (en) * | 2012-10-18 | 2015-07-01 | 中联重科股份有限公司 | Hydraulic system for controlling amplitude variation of arm support and crane |
| CN104528555A (en) * | 2014-12-19 | 2015-04-22 | 中联重科股份有限公司 | Main arm variable amplitude controlling system for crane and crane |
| CN104528555B (en) * | 2014-12-19 | 2017-03-22 | 中联重科股份有限公司 | Main arm variable amplitude controlling system for crane and crane |
| CN107934807A (en) * | 2017-12-28 | 2018-04-20 | 徐工集团工程机械有限公司 | The variable amplitude hydraulic system and lorry-mounted crane of crane |
| CN113700687A (en) * | 2021-08-06 | 2021-11-26 | 中际联合（北京）科技股份有限公司 | Hydraulic amplitude changing system of crane and offshore crane |
| CN113700687B (en) * | 2021-08-06 | 2024-06-04 | 中际联合（北京）科技股份有限公司 | Hydraulic amplitude changing system of crane and offshore crane |
| WO2023134041A1 (en) * | 2022-01-17 | 2023-07-20 | 湖南星邦智能装备股份有限公司 | Control method for controlling retraction of boom, system, mechanical device and storage medium |
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