CN102431898B - Quantitative displacement hydraulic control system for crane and crane - Google Patents
Quantitative displacement hydraulic control system for crane and crane Download PDFInfo
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- CN102431898B CN102431898B CN 201110263949 CN201110263949A CN102431898B CN 102431898 B CN102431898 B CN 102431898B CN 201110263949 CN201110263949 CN 201110263949 CN 201110263949 A CN201110263949 A CN 201110263949A CN 102431898 B CN102431898 B CN 102431898B
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- oil
- change
- valve
- over valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
- F15B13/0442—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors with proportional solenoid allowing stable intermediate positions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
The invention discloses a quantitative displacement hydraulic control system for a crane, which relates to the technical field of the crane and comprises a metering oil cylinder, a first reversing valve and a safety valve, wherein an oil inlet of the first reversing valve is communicated with a hydraulic oil source, a first oil outlet and a second oil outlet of the first reversing valve are respectively communicated with a rod cavity and a rod-less cavity of the metering oil cylinder, an oil return opening of the first reversing valve is communicated with an oil tank, and the rod cavity of the metering oil cylinder is communicated with a cavity of an amplitude variable oil cylinder through the safety valve. When the crane is used for hoisting heavy objects, the ascending or descending displacement required by the crane can be detected in advance for determining the hydraulic oil required by the amplitude variable oil cylinder, the required hydraulic oil is accurately provided for the amplitude variable oil cylinder through the metering function of the metering oil cylinder, or the hydraulic oil required to be discharged in the amplitude variable oil cylinder is accurately discharged, and further, the quantitative displacement of the crane is accurately controlled, so the hanging operation can be easily and precisely completed. The invention also discloses the crane with the quantitative displacement hydraulic control system for the crane.
Description
Technical field
The present invention relates to the hoisting crane technical field, relate in particular to the quantitative displacement hydraulic control system of a kind of hoisting crane.The invention still further relates to a kind of hoisting crane with the quantitative displacement hydraulic control system of above-mentioned hoisting crane.
Background technology
Car hosit is a kind of use construction machinery and equipment widely, it can be walked with fast speed, manoevreability is good, comformability is strong, the self-powered does not need to be equipped with power supply, operation in the open air, convenient and flexible operation, has therefore obtained in fields such as communications and transportation, urban construction, fire-fighting, large-scale material field, capital construction, first aids using widely.
The arm of car hosit rises in the effect of amplitude oil cylinder, falls to moving, under the effect of swing type mechanism, turn round in the horizontal direction, suspension hook on the arm carries out the folding and unfolding action under the effect of major-minor elevator, adopt hydraulic control system control amplitude oil cylinder, swing type mechanism and major-minor elevator to carry out corresponding action usually.
Prior art, the hydraulic control system control accuracy of car hosit is lower, can't carry out the quantitative displacement of lift heavy accurately, car hosit is when hoisting heavy, usually need to rely on installation personnel to match and finish lifting operation through trying to hang repeatedly with the crane operation personnel, very good to the operators'skills requirement, and work efficiency is lower.
Therefore, how to control the quantitative displacement of lift heavy accurately, accurately finish lifting operation easily, become the technical barrier that those skilled in the art need to be resolved hurrily.
Summary of the invention
First purpose of the present invention provides the quantitative displacement hydraulic control system of a kind of hoisting crane, and the quantitative displacement hydraulic control system of this hoisting crane can be controlled the quantitative displacement of lift heavy accurately, more accurately finishes lifting operation.Second purpose of the present invention provides a kind of hoisting crane with the quantitative displacement hydraulic control system of above-mentioned hoisting crane.
In order to realize above-mentioned first purpose, the invention provides the quantitative displacement hydraulic control system of a kind of hoisting crane, comprise metering oil cylinder, first change-over valve, safety valve, the oil inlet of described first change-over valve is communicated with hydraulic oil source, first oil outlet of described first change-over valve, second oil outlet are communicated with rodless cavity, the rod chamber of metering oil cylinder respectively, and the return opening of described first change-over valve is communicated with fuel tank; The rod chamber of described metering oil cylinder is communicated with the rodless cavity of amplitude oil cylinder by described safety valve.
Preferably, oil circuit between second oil outlet of described first change-over valve and the rod chamber of described metering oil cylinder is provided with the 3rd change-over valve, second oil outlet of described first change-over valve is communicated with the rod chamber of described metering oil cylinder by described the 3rd change-over valve, and the rod chamber of described metering oil cylinder is communicated with described safety valve by described the 3rd change-over valve.
Preferably, described the 3rd change-over valve is two-position three way solenoid directional control valve, 3-position 4-way solenoid directional control valve or two-position four-way solenoid directional control valve.
Preferably, first oil outlet of described first change-over valve is communicated with major-minor elevator control oil channel by switch valve.
Preferably, described first change-over valve is electromagnetic proportional valve or switch valve.
Preferably, described electromagnetic proportional valve adopts O type meta function.
Preferably, also be provided with second change-over valve on the oil inlet of described first change-over valve and the oil circuit between the hydraulic oil source, the oil inlet of described second change-over valve is communicated with described hydraulic oil source, and first oil outlet of described second change-over valve, second oil outlet are communicated with oil inlet, the revolution control oil channel of described first change-over valve respectively.
Preferably, described first change-over valve is communicated with fuel tank by by pass valve with oil circuit between described second change-over valve.
Preferably, described safety valve is the thread cartridge electromagnetic switch valve.
The quantitative displacement hydraulic control system of hoisting crane provided by the invention comprises metering oil cylinder, first change-over valve, safety valve, the oil inlet of described first change-over valve is communicated with hydraulic oil source, first oil outlet of described first change-over valve, second oil outlet are communicated with rod chamber, the rodless cavity of metering oil cylinder respectively, and the return opening of described first change-over valve is communicated with fuel tank; The rod chamber of described metering oil cylinder is communicated with the cavity of amplitude oil cylinder by described safety valve.
Hoisting crane is when hoisting heavy, and the oil inlet of first change-over valve is communicated with second oil outlet, and safety valve is closed, and the hydraulic oil of hydraulic oil source enters the rod chamber of metering oil cylinder, realizes that the withdrawal of metering oil cylinder resets; The oil inlet of first change-over valve is communicated with first oil outlet, and safety valve is opened, and the hydraulic oil of hydraulic oil source enters the rodless cavity of metering oil cylinder, realizes that luffing plays action; The oil inlet of first change-over valve is communicated with second oil outlet, safety valve is opened, the hydraulic oil of amplitude oil cylinder rodless cavity enters the rod chamber of metering oil cylinder, and the hydraulic oil in the metering oil cylinder rodless cavity flows back to fuel tank through the return opening of first change-over valve, realizes that luffing falls to moving; The oil inlet of first change-over valve is communicated with first oil outlet, safety valve is closed, the hydraulic oil of hydraulic oil source enters the rodless cavity of metering oil cylinder, and the hydraulic oil in the rod chamber of metering oil cylinder flows back to fuel tank by the return opening of first change-over valve, and realization metering oil cylinder stretches out and resets.
Hoisting crane is when hoisting heavy, the displacement that can detect required of lift heavy earlier or fall is to determine the required hydraulic oil of amplitude oil cylinder, function of measuring by the metering oil cylinder provides its required hydraulic oil to amplitude oil cylinder exactly, or discharge exactly and need the hydraulic oil of discharging in the amplitude oil cylinder, and then accurately control the quantitative displacement of lift heavy, thereby can accurately finish lifting operation easily.
In order to realize above-mentioned second purpose, the present invention also provides a kind of hoisting crane, comprises amplitude oil cylinder, swing type mechanism, major-minor elevator, and this hoisting crane is by the location displacement of the quantitative displacement hydraulic control system control of above-mentioned hoisting crane lift heavy.Because the above-mentioned quantitative displacement hydraulic control system of hoisting crane has above-mentioned technique effect, the hoisting crane with the quantitative displacement hydraulic control system of this hoisting crane also should possess the corresponding techniques effect.
Description of drawings
Fig. 1 is the principle schematic of a kind of specific embodiment of the quantitative displacement control system of hoisting crane provided by the present invention;
Wherein, among Fig. 1:
Switch valve 1, first change-over valve 2, by pass valve 3, check valve 4, second change-over valve 5, safety valve 6, the 3rd change-over valve 7, metering oil cylinder 8.
The specific embodiment
In order to make those skilled in the art better understand technical scheme of the present invention, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please referring to Fig. 1, Fig. 1 is the principle schematic of a kind of specific embodiment of the quantitative displacement control system of hoisting crane provided by the present invention.
As shown in Figure 1, the quantitative displacement hydraulic control system of hoisting crane provided by the invention, comprise metering oil cylinder 8, first change-over valve 2, safety valve 6, the oil inlet of described first change-over valve 2 is communicated with hydraulic oil source, first oil outlet of described first change-over valve 2, second oil outlet are communicated with rodless cavity, the rod chamber of metering oil cylinder 8 respectively, and the return opening of described first change-over valve 2 is communicated with fuel tank; The rod chamber of described metering oil cylinder 8 is communicated with the cavity of amplitude oil cylinder by described safety valve 6, and in the concrete scheme, the rod chamber of described metering oil cylinder 8 is communicated with the rodless cavity of amplitude oil cylinder by described safety valve 6.
In the preferred version, the return opening of first change-over valve 2 can be communicated with fuel tank by check valve 4, to prevent that backflow phenomenon appears in hydraulic oil in the fuel tank.
Hoisting crane is when hoisting heavy, and the oil inlet of first change-over valve 2 is communicated with second oil outlet, and safety valve 6 is closed, and the hydraulic oil of hydraulic oil source enters the rod chamber of metering oil cylinder 8, realizes that 8 withdrawals of metering oil cylinder reset; The oil inlet of first change-over valve 2 is communicated with first oil outlet, and safety valve 6 is opened, and the hydraulic oil of hydraulic oil source enters the rodless cavity of metering oil cylinder 8, realizes that luffing plays action; The oil inlet of first change-over valve 2 is communicated with second oil outlet, safety valve 6 is opened, the hydraulic oil of amplitude oil cylinder rodless cavity enters the rod chamber of metering oil cylinder 8, and the hydraulic oil in metering oil cylinder 8 rodless cavities flows back to fuel tank through the return opening of first change-over valve 2, realizes that luffing falls to moving; The oil inlet of first change-over valve 2 is communicated with first oil outlet, safety valve 6 is closed, the hydraulic oil of hydraulic oil source enters the rodless cavity of metering oil cylinder 8, and the hydraulic oil in the rod chamber of metering oil cylinder 8 flows back to fuel tank by the return opening of first change-over valve 2, and realization metering oil cylinder 8 stretches out and resets.
Hoisting crane is when hoisting heavy, can detect the required displacement that rises or fall of lift heavy earlier to determine the required hydraulic oil of amplitude oil cylinder, function of measuring by metering oil cylinder 8 provides its required hydraulic oil to amplitude oil cylinder more exactly, or discharge more exactly and need the hydraulic oil of discharging in the amplitude oil cylinder, and then accurately control the quantitative displacement of lift heavy, thereby can accurately finish lifting operation easily.
In the preferred scheme, safety valve 6 can adopt thread cartridge electromagnetic switch valve 1, thread cartridge electromagnetic switch valve 1 can be directly installed on the cylinder body of amplitude oil cylinder, can adopt extra hydraulic tubing between safety valve 6 and the amplitude oil cylinder, can prevent that the booster phenomenon from appearring in hydraulic tubing because of pressure is excessive, improved safety performance.
In the concrete scheme, oil circuit between second oil outlet of described first change-over valve 2 and the rod chamber of described metering oil cylinder 8 is provided with the 3rd change-over valve 7, second oil outlet of described first change-over valve 2 is communicated with the rod chamber of described metering oil cylinder 8 by described the 3rd change-over valve 7, the rod chamber of described metering oil cylinder 8 is communicated with described safety valve 6 by described the 3rd change-over valve 7, can be by action of the 3rd change-over valve 7 luffings and homing action.
In the preferred scheme, the 3rd change-over valve 7 can adopt the two-bit triplet solenoid directional control valve, and whether can control the 3rd change-over valve 7 by automatically controlled signal needs commutation.
In the preferred version, first oil outlet of described first change-over valve 2 is communicated with major-minor elevator control oil channel by switch valve 1.When the major-minor elevator of hoisting crane need move, the oil inlet of first change-over valve 2 is communicated with first oil outlet, switch valve 1 is opened, safety valve 6 is closed, the hydraulic oil of hydraulic oil source can enter major-minor elevator hydraulic circuit by first change-over valve 2, switch valve 1, for it provides power, this moment, amplitude oil cylinder stopped action; When amplitude oil cylinder need be moved, off switch valve 1, major-minor elevator stopped action.In this scheme, major-minor hoisting mechanism, amplitude oil cylinder can provide power by a hydraulic oil source, make the quantitative displacement hydraulic control system of this hoisting crane both can realize the control of amplitude oil cylinder, can realize the control of major-minor hoisting mechanism again.
In the more excellent scheme, for accuracy control enters the flow of the hydraulic oil of major-minor elevator control oil channel, first change-over valve 2 can adopt electromagnetic proportional valve, is entered the flow of the hydraulic oil of major-minor elevator control oil channel by electromagnetic proportional valve control.
In the preferred scheme, described electromagnetic proportional valve can adopt O type meta function, can reduce the spillage of hydraulic oil in the system.
In the preferred version, also be provided with second change-over valve 5 on the oil inlet of described first change-over valve 2 and the oil circuit between the hydraulic oil source, in the concrete scheme, second change-over valve 5 can adopt solenoid directional control valve, the oil inlet of described second change-over valve 5 is communicated with described hydraulic oil source, first oil outlet of described second change-over valve 5, second oil outlet respectively with the oil inlet of described first change-over valve 2, revolution control oil channel.
When the oil inlet of second change-over valve 5 was communicated with first oil outlet, the hydraulic oil of hydraulic oil source provided hydraulic oil to first change-over valve 2, and amplitude oil cylinder or major-minor hoisting mechanism can carry out work; When the oil inlet of second change-over valve 5 was communicated with second oil outlet, the hydraulic oil flow of hydraulic oil source was to revolution control oil channel, swing type mechanism work.In this scheme, major-minor hoisting mechanism or amplitude oil cylinder and swing type mechanism can provide power by a hydraulic oil source, make the quantitative displacement hydraulic control system of this hoisting crane can realize the control of amplitude oil cylinder or major-minor hoisting mechanism, can realize the control of swing type mechanism again.
In the preferred scheme; described first change-over valve 2 is communicated with fuel tank by by pass valve 3 with oil circuit between described second change-over valve 5; when the pressure of hydraulic oil in the oil circuit between first change-over valve 2 and second change-over valve 5 is excessive, can flow back to fuel tank by by pass valve 3, can play the effect of protection oil circuit.
The principle of work of the quantitative displacement hydraulic control system of above-mentioned hoisting crane is as follows.
Major-minor elevator control process: by the hydraulic oil P that hydraulic oil source provides, DT1, Y1, DT2 get electric, to major-minor elevator fuel feeding, by the size of current of control Y1, control fuel supply flow rate through second change-over valve 5, first change-over valve 2, switch valve 1.
The control process of luffing: hydraulic oil is by behind second change-over valve 5, and by the flexible direction of Y1, Y2 control metering oil cylinder 8, the 3rd change-over valve 7 control luffings move and homing actions.When the luffing time-out, DT1, Y1, DT4 get; When 8 withdrawals of metering oil cylinder resetted, DT1, Y2, DT3 got; When luffing fell, DT4, Y2 got; When metering oil cylinder 8 stretches out when resetting, DT1, Y1, DT3 get.
Rotating control process: directly to revolution control oil channel fuel feeding, the action of amplitude oil cylinder does not influence the regular event of swing type mechanism to hydraulic oil source through second change-over valve 5.
In the foregoing description; major-minor elevator control oil channel, swing type mechanism control oil channel and amplitude oil cylinder adopt same hydraulic oil source; the present invention is not limited thereto; major-minor elevator control oil channel, swing type mechanism control oil channel all can adopt extra independently hydraulic circuit to control, and this scheme also should be in protection scope of the present invention.
In the foregoing description, first change-over valve adopts electromagnetic proportional valve, and the present invention is not limited thereto, and first change-over valve can also adopt switch valve etc.
In the foregoing description, the 3rd change-over valve 7 adopts the two-position three way solenoid directional control valve, and the present invention is not limited thereto, and the 3rd change-over valve 7 also can adopt 3-position 4-way solenoid directional control valve, two-position four-way solenoid directional control valve etc.
The present invention also provides a kind of hoisting crane, comprises amplitude oil cylinder, swing type mechanism, major-minor elevator, and this hoisting crane is by the location displacement of the quantitative displacement hydraulic control system control of above-mentioned hoisting crane lift heavy.The quantitative displacement hydraulic control system of above-mentioned hoisting crane can be used as a functional module; be integrated in the hydraulic efficiency pressure system of hoisting crane car load; hydraulic oil source can adopt independently hydraulic oil source in the quantitative displacement hydraulic control system of this hoisting crane; also can adopt the hydraulic oil source of the hydraulic efficiency pressure system of hoisting crane car load, all should be in protection scope of the present invention.
Because the above-mentioned quantitative displacement hydraulic control system of hoisting crane has above-mentioned technique effect, the hoisting crane with the quantitative displacement hydraulic control system of this hoisting crane also should possess the corresponding techniques effect.
Hoisting crane can be car hosit, crawler crane etc.
The above only is the description of the preferred implementation of invention; should be understood that; because the finiteness of literal expression; and objectively have unlimited concrete structure; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. quantitative displacement hydraulic control system of hoisting crane, it is characterized in that, comprise metering oil cylinder, first change-over valve, safety valve, the oil inlet of described first change-over valve is communicated with hydraulic oil source, first oil outlet of described first change-over valve, second oil outlet are communicated with rodless cavity, the rod chamber of metering oil cylinder respectively, and the return opening of described first change-over valve is communicated with fuel tank; The rod chamber of described metering oil cylinder is communicated with the rodless cavity of amplitude oil cylinder by described safety valve.
2. the quantitative displacement hydraulic control system of hoisting crane according to claim 1, it is characterized in that, oil circuit between second oil outlet of described first change-over valve and the rod chamber of described metering oil cylinder is provided with the 3rd change-over valve, second oil outlet of described first change-over valve is communicated with the rod chamber of described metering oil cylinder by described the 3rd change-over valve, and the rod chamber of described metering oil cylinder is communicated with described safety valve by described the 3rd change-over valve.
3. the quantitative displacement hydraulic control system of hoisting crane according to claim 2 is characterized in that, described the 3rd change-over valve is two-position three way solenoid directional control valve, 3-position 4-way solenoid directional control valve or two-position four-way solenoid directional control valve.
4. the quantitative displacement hydraulic control system of hoisting crane according to claim 1 is characterized in that, first oil outlet of described first change-over valve is communicated with major-minor elevator control oil channel by switch valve.
5. according to claim 1 or the quantitative displacement hydraulic control system of 4 described hoisting cranes, it is characterized in that described first change-over valve is electromagnetic proportional valve or switch valve.
6. the quantitative displacement hydraulic control system of hoisting crane according to claim 5 is characterized in that, described electromagnetic proportional valve adopts O type meta function.
7. according to claim 1 or the quantitative displacement hydraulic control system of 4 described hoisting cranes, it is characterized in that, also be provided with second change-over valve on the oil inlet of described first change-over valve and the oil circuit between the hydraulic oil source, the oil inlet of described second change-over valve is communicated with described hydraulic oil source, and first oil outlet of described second change-over valve, second oil outlet are communicated with oil inlet, the revolution control oil channel of described first change-over valve respectively.
8. the quantitative displacement hydraulic control system of hoisting crane according to claim 7 is characterized in that, described first change-over valve is communicated with fuel tank by by pass valve with oil circuit between described second change-over valve.
9. the quantitative displacement hydraulic control system of hoisting crane according to claim 1 is characterized in that described safety valve is the thread cartridge electromagnetic switch valve.
10. a hoisting crane comprises amplitude oil cylinder, swing type mechanism, major-minor elevator, it is characterized in that, this hoisting crane is by the location displacement of the quantitative displacement hydraulic control system control of each described hoisting crane of claim 1-9 lift heavy.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110263949 CN102431898B (en) | 2011-09-07 | 2011-09-07 | Quantitative displacement hydraulic control system for crane and crane |
| PCT/CN2012/074219 WO2013033994A1 (en) | 2011-09-07 | 2012-04-17 | Quantitative displacement hydraulic control system for crane and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110263949 CN102431898B (en) | 2011-09-07 | 2011-09-07 | Quantitative displacement hydraulic control system for crane and crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102431898A CN102431898A (en) | 2012-05-02 |
| CN102431898B true CN102431898B (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110263949 Expired - Fee Related CN102431898B (en) | 2011-09-07 | 2011-09-07 | Quantitative displacement hydraulic control system for crane and crane |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102431898B (en) |
| WO (1) | WO2013033994A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734241B (en) * | 2012-06-27 | 2014-12-10 | 三一重工股份有限公司 | Opened and closed hydraulic system and engineering machinery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4569272A (en) * | 1982-03-22 | 1986-02-11 | Vickers, Incorporated | Power transmission |
| JP2001247293A (en) * | 2000-03-07 | 2001-09-11 | Hitachi Constr Mach Co Ltd | Hydraulic winch circuit for crane |
| JP2002039107A (en) * | 2000-07-18 | 2002-02-06 | Hitachi Constr Mach Co Ltd | Hydraulic circuit having counterbalance valve, and crane |
| CN2743315Y (en) * | 2004-02-11 | 2005-11-30 | 徐州工程机械科技股份有限公司徐工研究院 | Quantitative hydraulic element lifting variable speed system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2058913U (en) * | 1989-11-09 | 1990-07-04 | 西安冶金建筑学院 | Hydraulic controller for crane lifting |
| CN2293547Y (en) * | 1997-04-02 | 1998-10-07 | 吴一山 | Portable hydraulic elevator for container |
| JPH11229430A (en) * | 1998-02-12 | 1999-08-24 | Yutani Heavy Ind Ltd | Heater for construction machine |
| JP4351581B2 (en) * | 2004-05-18 | 2009-10-28 | 日立建機株式会社 | Gripping force control device and demolition work machine |
| CN2725603Y (en) * | 2004-09-23 | 2005-09-14 | 贵州枫阳液压有限责任公司 | Tower crane hydraulic pump station |
| CN101229902B (en) * | 2008-02-19 | 2010-07-21 | 湖南三一起重机械有限公司 | Hydraulic oil distribution controlling device for crane hydraulic system |
| JP2011157163A (en) * | 2010-01-29 | 2011-08-18 | Caterpillar Sarl | Hydraulic control device of working machine |
| CN201942453U (en) * | 2011-01-07 | 2011-08-24 | 魏德让 | Hydraulic pressure balance crane |
| CN102030266B (en) * | 2011-01-14 | 2013-04-10 | 徐州重型机械有限公司 | Crane and hydraulic control system thereof |
-
2011
- 2011-09-07 CN CN 201110263949 patent/CN102431898B/en not_active Expired - Fee Related
-
2012
- 2012-04-17 WO PCT/CN2012/074219 patent/WO2013033994A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4569272A (en) * | 1982-03-22 | 1986-02-11 | Vickers, Incorporated | Power transmission |
| JP2001247293A (en) * | 2000-03-07 | 2001-09-11 | Hitachi Constr Mach Co Ltd | Hydraulic winch circuit for crane |
| JP2002039107A (en) * | 2000-07-18 | 2002-02-06 | Hitachi Constr Mach Co Ltd | Hydraulic circuit having counterbalance valve, and crane |
| CN2743315Y (en) * | 2004-02-11 | 2005-11-30 | 徐州工程机械科技股份有限公司徐工研究院 | Quantitative hydraulic element lifting variable speed system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102431898A (en) | 2012-05-02 |
| WO2013033994A1 (en) | 2013-03-14 |
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