CN113428803A - Motion compensation type double-ship cooperative hydraulic jacking device - Google Patents
Motion compensation type double-ship cooperative hydraulic jacking device Download PDFInfo
- Publication number
- CN113428803A CN113428803A CN202110571953.3A CN202110571953A CN113428803A CN 113428803 A CN113428803 A CN 113428803A CN 202110571953 A CN202110571953 A CN 202110571953A CN 113428803 A CN113428803 A CN 113428803A
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- jacking
- motion
- cooperative
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
- B66F7/16—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks
- B66F7/20—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks by several jacks with means for maintaining the platforms horizontal during movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B85/00—Dismantling or scrapping vessels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/28—Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a motion compensation type double-ship cooperative hydraulic jacking device which is applied to a double-ship cooperative jacking ocean platform and comprises two sets of hydraulic jacking mechanisms which are respectively arranged on two ships; every set of hydraulic pressure climbing mechanism includes: the bottom end of the hydraulic cylinder is fixed on a ship, and the upper end of the hydraulic cylinder is connected with an upper layer module of the ocean platform; the hydraulic oil tank is used for storing hydraulic oil; a main oil passage connecting the hydraulic cylinder to the hydraulic oil tank; the hydraulic pump is respectively connected to the motor and the hydraulic oil tank, and inputs the pressurized hydraulic oil into the main oil way; the hydraulic cylinder comprises a cylinder body and a plunger, the cylinder body is divided into an upper chamber and a lower chamber by the plunger, and the plunger can move in the cylinder body; wherein, the lower chambers of the two sets of hydraulic jacking mechanisms are communicated through a second oil way. According to the invention, when the relative positions of the two ships are different due to waves, the plungers in the hydraulic cylinders are still consistent, namely the jacking heights are still consistent, so that the stability of the posture of the upper layer module is ensured, and the safety is improved.
Description
Technical Field
The invention relates to the field of ship and ocean engineering, in particular to a motion compensation type double-ship cooperative hydraulic jacking device.
Background
Due to the variable and severe marine environment, the ship and the marine engineering structure often collide when the floating support is dismantled. In the process of detaching the platform from the floating support, the importance of stable butt joint and transportation of the upper layer module is self-evident due to complex procedures, multiple risk factors and high safety requirements. For a large platform, particularly a platform with a mass of more than 5000 tons, the traditional platform dismantling scheme is to use hoisting equipment for hoisting and dismantling in blocks, however, the dismantling mode is long in time and serious in pollution, and is easily limited by each party during operation in some sea areas. Therefore, in the prior art, a scheme of adopting double-ship cooperative jacking is developed, and two identical semi-submersible ships are utilized to integrally lift the layer building block on the platform. However, in the process of detaching the platform from the actual floating support, because two ships participate in the operation, the inclination of the upper layer module caused by the inconsistent floating states of the two ships is inevitable, and the danger of overturning may exist in severe cases.
Therefore, the technical personnel in the field are dedicated to developing a motion compensation type double-ship cooperative hydraulic jacking device, so that the jacking heights of hydraulic cylinders can be kept consistent when the relative positions of two ships are different due to waves, the stability of the posture of the upper layer module is ensured, and the safety is improved.
Disclosure of Invention
In order to achieve the above object, the present invention provides a motion compensation type twin-vessel cooperative hydraulic jacking apparatus, wherein the jacking apparatus is configured to be applied to a twin-vessel cooperative jacking offshore platform, the jacking apparatus includes two sets of hydraulic jacking mechanisms, and the two sets of hydraulic jacking mechanisms are configured to be respectively arranged on two vessels; wherein, every set of two sets of hydraulic jacking mechanisms includes:
the bottom end of the hydraulic cylinder is fixed on the ship, and the upper end of the hydraulic cylinder is used for being connected with an upper layer module of the ocean platform;
the hydraulic oil tank is used for storing hydraulic oil;
a main oil passage connecting the hydraulic cylinder to the hydraulic oil tank;
the hydraulic pump is respectively connected to the motor and the hydraulic oil tank and used for pressurizing hydraulic oil in the hydraulic oil tank and inputting the pressurized hydraulic oil into the main oil way;
wherein the hydraulic cylinder comprises a cylinder body and a plunger dividing the cylinder body into an upper chamber and a lower chamber, the plunger configured to be movable within the cylinder body;
and the lower cavities of the two sets of hydraulic jacking mechanisms are communicated through a second oil way.
Further, the second oil passage is arranged on the upper block.
Further, the main oil passages connect the upper chamber and the lower chamber to the hydraulic oil tanks, respectively.
Further, hydraulic pressure climbing mechanism still includes the stop valve, the stop valve sets up in the main oil circuit, be used for with the pneumatic cylinder pressure release.
Further, the hydraulic jacking mechanism further includes a throttle valve that is adjustable, the throttle valve being disposed on the main oil passage and configured to be able to control a flow of fluid in the main oil passage.
Further, the hydraulic jacking mechanism further comprises an overflow valve, the overflow valve is arranged on a branch pipeline of the main oil way, and the overflow valve is configured to be capable of jacking when the internal pressure of the main oil way exceeds a preset value.
Further, hydraulic pressure climbing mechanism still includes the filter, the filter sets up on the main oil way.
Further, two ends of the filter are respectively provided with a pressure sensor.
Further, the hydraulic jacking mechanism is configured to be connected to a docking device connected to the upper deck block.
Further, the hydraulic cylinder is made of metallic iron.
The motion compensation type double-ship cooperative hydraulic jacking device has the following technical effects: the invention is based on the principle of a communicating vessel and communicates the lower chambers of the two hydraulic cylinders. Since the pressures in the two cylinders are equal, when the two cylinders are at the same height, the height of the ram is also the same. When two pneumatic cylinders are not consistent in height, because the internal pressure of the two pneumatic cylinders is equal, hydraulic oil in the pneumatic cylinder at a high position can flow to the pneumatic cylinder at a low position, and finally the heights of the plungers in the two pneumatic cylinders can be kept level, so that the plungers in the pneumatic cylinders are still consistent when relative positions of two ships are different due to waves, namely the jacking height is still consistent, the stability of the posture of the upper layer module is ensured, and the safety is improved.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic overall structure of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of a single hydraulic jack mechanism of FIG. 1;
fig. 3 is a schematic workflow diagram of the present invention.
The hydraulic lifting device comprises a plunger 1, a stop valve 2, a throttle valve 3, a filter 4, an overflow valve 5, a motor 6, a hydraulic oil tank 7, an upper layer module 8, a ship 9, a butt joint device 10, a second oil way 11, a cylinder body 12, a hydraulic pump 13, a main oil way 14, an upper cavity 15, a lower cavity 16 and a hydraulic lifting mechanism 100.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
As shown in fig. 1, the invention provides a motion compensation type double-ship cooperative hydraulic jacking device, which is applied to the dismantling of an ocean platform in a double-ship cooperative jacking mode. The motion compensation type double-ship cooperative hydraulic jacking device comprises two sets of hydraulic jacking mechanisms 100 which are respectively arranged on two ships 9 and used for bearing an upper-layer block 8. As shown in fig. 2, each hydraulic jacking mechanism 100 is capable of achieving automatic lifting and comprises at least a hydraulic cylinder, a hydraulic oil tank 7, a hydraulic pump 13, a motor 6 and a main oil circuit 14. The bottom end of the hydraulic cylinder is fixed on a ship 9, and the upper end of the hydraulic cylinder can be connected with an upper-layer block 8 of the ocean platform through a butt joint device 10. The hydraulic cylinder comprises a cylinder body 12 and a plunger 1, wherein the cylinder body 12 can be made of metal materials with enough strength, has enough pressure resistance and has enough movement stroke inside. The cylinder block 12 is fixed to the deck of the ship 9 and serves as a support member for the entire hydraulic jack 100. The plunger 1 is fitted inside the cylinder 12 and can smoothly perform an up-and-down plunger movement in the chamber of the cylinder 12. The plunger 1 divides the chamber of the cylinder body 12 into an upper chamber 15 and a lower chamber 16, and the plunger 1 has enough tightness and can isolate the liquid in the upper chamber 15 and the lower chamber 16 in the cylinder body 12. The plunger 1 acts as a load bearing member during jacking. The hydraulic pump 13 is connected with the motor 6 and is a power element of the hydraulic jacking mechanism 100, the hydraulic pump 13 is connected with the hydraulic oil tank 7, hydraulic oil is sucked from the hydraulic oil tank 7, and pressure oil is formed and conveyed into the main oil way 14. The hydraulic oil tank 7 is fixed on the ship 9 and is connected with the main oil way 14 to provide the transmission and discharge of hydraulic oil inside the whole hydraulic jacking mechanism 100. The main oil path 14 is arranged in each independent hydraulic jacking mechanism 100, the main oil path 14 can communicate the upper chamber 15 and the lower chamber 16 of the cylinder body 12 to the hydraulic oil tank 7, pressure oil is conveyed into a pipeline through the hydraulic pump 13, high-pressure oil is conveyed to the lower chamber 16 of the cylinder body 12, pressure is formed for the plunger 1 to jack upwards, and then oil extruded from the upper chamber 15 is discharged into the hydraulic oil tank 7. The lower chambers 16 of the two hydraulic jacking mechanisms 100 are communicated through the second oil path 11. As shown in fig. 3, the present invention is based on the principle of a communicating vessel, communicating the lower chambers 16 of the two hydraulic cylinders. Since the pressures in the two cylinders are equal, when the two cylinders are at the same height, the height of the ram is also the same. When the heights of the two hydraulic cylinders are different, because the internal pressures of the two hydraulic cylinders are equal, hydraulic oil in the hydraulic cylinder at the high position flows to the hydraulic cylinder at the low position, and finally the heights of the plungers 1 in the two hydraulic cylinders are kept equal. When the relative positions of the two ships 9 are different due to waves, the height of the plunger 1 in the hydraulic cylinder is still kept consistent due to the principle of the communicating vessels, so that the jacking height is consistent, and the stability of the posture of the upper layer module 8 is ensured.
In some embodiments, the second oil path 11 may be wired through the upper layer block 8. After the two ships 9 are respectively connected to the upper module 8, the second oil path 11 is arranged along the upper module 8, thereby connecting the hydraulic cylinders of the hydraulic jacks 100 on the two ships 9. Therefore, the arrangement of the second oil path 11 can be conveniently realized, and the jacking operation cannot be influenced.
The hydraulic jacking mechanism 100 is connected with the upper layer module 8 through a docking device 10. The docking unit 10 may be welded to the lower end of the upper block 8 before the jacking operation, and the hydraulic jacking mechanism 100 may be docked with the docking unit 10 during the operation.
In some embodiments, each hydraulic jacking mechanism 100 may further include a shutoff valve 2 disposed in the main oil passage 14, the shutoff valve 2 being opened when the hydraulic cylinder is depressurized, the hydraulic oil in the lower chamber 16 being returned to the hydraulic oil tank 7, and the shutoff valve 2 being closed when the hydraulic cylinder is pressurized. In some embodiments, each hydraulic jack 100 may further include a throttle valve 3, and the throttle valve 3 may be disposed on the main oil passage 14, and may control the flow rate of the fluid inside the hydraulic jack 100 by changing a throttle section or a throttle length. In some embodiments, each hydraulic jacking mechanism 100 may further include an overflow valve 5, and the overflow valve 5 is disposed on a branch line of the main oil line 14, so as to provide safety protection in the whole hydraulic jacking mechanism 100. When the internal pressure of the pipeline exceeds a specified value, the overflow valve 5 is pushed open to discharge the liquid in the pipeline into the hydraulic oil tank 7. In some embodiments, each hydraulic jack 100 may further include a filter 4 for filtering impurities and air from the oil. Pressure sensors may be provided at the inlet and outlet of the filter 4 to monitor the pressure across the filter 4, and when the pressures at the two ends are not the same, it may be determined whether the filter 4 is clogged.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A motion compensation type double-ship cooperative hydraulic jacking device is characterized in that the jacking device is configured to be applied to a double-ship cooperative jacking ocean platform, the jacking device comprises two sets of hydraulic jacking mechanisms, and the two sets of hydraulic jacking mechanisms are configured to be arranged on two ships respectively; wherein, every set of two sets of hydraulic jacking mechanisms includes:
the bottom end of the hydraulic cylinder is fixed on the ship, and the upper end of the hydraulic cylinder is used for being connected with an upper layer module of the ocean platform;
the hydraulic oil tank is used for storing hydraulic oil;
a main oil passage connecting the hydraulic cylinder to the hydraulic oil tank;
the hydraulic pump is respectively connected to the motor and the hydraulic oil tank and used for pressurizing hydraulic oil in the hydraulic oil tank and inputting the pressurized hydraulic oil into the main oil way;
wherein the hydraulic cylinder comprises a cylinder body and a plunger dividing the cylinder body into an upper chamber and a lower chamber, the plunger configured to be movable within the cylinder body;
and the lower cavities of the two sets of hydraulic jacking mechanisms are communicated through a second oil way.
2. The motion-compensated twin-vessel cooperative hydraulic jacking device according to claim 1, wherein said second oil passage is arranged on said upper block.
3. The motion-compensated twin-vessel cooperative hydraulic jacking device according to claim 1, wherein said main oil passages connect said upper chamber and said lower chamber to said hydraulic oil tank, respectively.
4. The motion-compensated, twin-vessel cooperative hydraulic jack apparatus according to claim 1, wherein said hydraulic jack mechanism further comprises a shut-off valve provided in said main oil passage for depressurizing said hydraulic cylinder.
5. The motion compensated twin vessel coordinated hydraulic jacking device of claim 1, wherein said hydraulic jacking mechanism further includes a throttle valve, said throttle valve being adjustable, said throttle valve being disposed on said main oil line and configured to be capable of controlling a flow of fluid in said main oil line.
6. The motion-compensated twin-ship cooperative hydraulic jacking device according to claim 1, wherein the hydraulic jacking mechanism further includes an overflow valve provided on a branch line of the main oil line, the overflow valve being configured to be capable of jacking open when an internal pressure of the main oil line exceeds a preset value.
7. The motion-compensated twin-vessel cooperative hydraulic jack apparatus according to claim 1, wherein the hydraulic jack mechanism further comprises a filter provided on the main oil line.
8. The motion-compensated twin-vessel cooperative hydraulic jack apparatus according to claim 7, wherein pressure sensors are provided at both ends of the filter, respectively.
9. The motion-compensated, twin-vessel cooperative hydraulic jack apparatus of claim 1, wherein the hydraulic jack mechanism is configured to be connected to a docking device connected to the upper block.
10. The motion-compensated twin-vessel cooperative hydraulic jacking system of claim 1 wherein said hydraulic cylinder is made of metallic iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571953.3A CN113428803B (en) | 2021-05-25 | 2021-05-25 | Motion compensation type double-ship cooperative hydraulic jacking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571953.3A CN113428803B (en) | 2021-05-25 | 2021-05-25 | Motion compensation type double-ship cooperative hydraulic jacking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113428803A true CN113428803A (en) | 2021-09-24 |
| CN113428803B CN113428803B (en) | 2022-07-29 |
Family
ID=77803160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110571953.3A Active CN113428803B (en) | 2021-05-25 | 2021-05-25 | Motion compensation type double-ship cooperative hydraulic jacking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113428803B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201053117Y (en) * | 2007-04-30 | 2008-04-30 | 四川宏华石油设备有限公司 | Self-elevating drilling platform for offshore oil-drilling |
| CN101586584A (en) * | 2008-05-20 | 2009-11-25 | 上海建工股份有限公司 | A kind of high level, tall and slender structure construction creeping formwork hydraulic synchronous control system |
| CN102330712A (en) * | 2011-10-16 | 2012-01-25 | 西安建筑科技大学 | Sectional hydraulic synchronous circuit |
| AU2012355968A1 (en) * | 2011-04-21 | 2013-10-31 | Actuant Corporation | Synchronized lifting apparatus |
| CN103613000A (en) * | 2013-12-02 | 2014-03-05 | 安涛(宁波)电器有限公司 | Self-balance type control method for offshore crane |
| CN103708375A (en) * | 2013-12-17 | 2014-04-09 | 天津大学 | Large-scale structure weighing hydraulic control structure based on speed control |
| CN103883574A (en) * | 2012-12-20 | 2014-06-25 | 国家核电技术有限公司 | Hydraulic multipoint synchronous control system |
| CN108612071A (en) * | 2018-05-11 | 2018-10-02 | 山东科技大学 | A kind of semi-submersible offshore platform Overthrow preventing device |
| CN109237111A (en) * | 2018-10-31 | 2019-01-18 | 北京航天益森风洞工程技术有限公司 | A kind of pressure-regulating hydraulic system and its control method of self-balancing pressure regulator valve |
| CN110405364A (en) * | 2019-08-29 | 2019-11-05 | 佛山市宏石激光技术有限公司 | A kind of suspension type self-balancing hydraulic lift |
| CN211110870U (en) * | 2019-11-20 | 2020-07-28 | 中车沈阳机车车辆有限公司 | Car lifting jack |
| CN211975547U (en) * | 2020-04-10 | 2020-11-20 | 无锡信仁通用机械有限公司 | Control system for series connection of multiple oil cylinders |
| CN212774136U (en) * | 2020-05-19 | 2021-03-23 | 中国地质大学（武汉） | Self-balancing control device of submarine drilling rig |
-
2021
- 2021-05-25 CN CN202110571953.3A patent/CN113428803B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201053117Y (en) * | 2007-04-30 | 2008-04-30 | 四川宏华石油设备有限公司 | Self-elevating drilling platform for offshore oil-drilling |
| CN101586584A (en) * | 2008-05-20 | 2009-11-25 | 上海建工股份有限公司 | A kind of high level, tall and slender structure construction creeping formwork hydraulic synchronous control system |
| AU2012355968A1 (en) * | 2011-04-21 | 2013-10-31 | Actuant Corporation | Synchronized lifting apparatus |
| CN102330712A (en) * | 2011-10-16 | 2012-01-25 | 西安建筑科技大学 | Sectional hydraulic synchronous circuit |
| CN103883574A (en) * | 2012-12-20 | 2014-06-25 | 国家核电技术有限公司 | Hydraulic multipoint synchronous control system |
| CN103613000A (en) * | 2013-12-02 | 2014-03-05 | 安涛(宁波)电器有限公司 | Self-balance type control method for offshore crane |
| CN103708375A (en) * | 2013-12-17 | 2014-04-09 | 天津大学 | Large-scale structure weighing hydraulic control structure based on speed control |
| CN108612071A (en) * | 2018-05-11 | 2018-10-02 | 山东科技大学 | A kind of semi-submersible offshore platform Overthrow preventing device |
| CN109237111A (en) * | 2018-10-31 | 2019-01-18 | 北京航天益森风洞工程技术有限公司 | A kind of pressure-regulating hydraulic system and its control method of self-balancing pressure regulator valve |
| CN110405364A (en) * | 2019-08-29 | 2019-11-05 | 佛山市宏石激光技术有限公司 | A kind of suspension type self-balancing hydraulic lift |
| CN211110870U (en) * | 2019-11-20 | 2020-07-28 | 中车沈阳机车车辆有限公司 | Car lifting jack |
| CN211975547U (en) * | 2020-04-10 | 2020-11-20 | 无锡信仁通用机械有限公司 | Control system for series connection of multiple oil cylinders |
| CN212774136U (en) * | 2020-05-19 | 2021-03-23 | 中国地质大学（武汉） | Self-balancing control device of submarine drilling rig |
Non-Patent Citations (1)
| Title |
|---|
| 巩运迎等: "基于流体自平衡原理的液压支架底座、顶梁同步升降测量方法及控制系统设计", 《科学家》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113428803B (en) | 2022-07-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2037104C (en) | Craft lift | |
| CN102358403A (en) | Semi-submerged platform and anti-overturning system for same | |
| CN101792092A (en) | Hydraulic system thermal contraction compensation apparatus and method | |
| FI64552C (en) | ANORDNING FOER HYDRAULISKA KRANAR | |
| CA2808452C (en) | Apparatuses and methods for closing and reopening a pipe | |
| CN113428803B (en) | Motion compensation type double-ship cooperative hydraulic jacking device | |
| CN105268136B (en) | Multifunctional fire engine | |
| CN108413032A (en) | A kind of tower pressure vessel and its working method | |
| CN113428802B (en) | Pressure self-balancing hydraulic cooperative jacking device | |
| US4029034A (en) | Method and apparatus for buoyancy control of submergible chambers | |
| CN104865132A (en) | Internal-pulling type ultrahigh-pressure hydraulic pressure testing machine for large-diameter steel pipe and hydraulic system of hydraulic pressure testing machine | |
| CN211275230U (en) | Vacuum pressurization infiltration device | |
| CN115653957B (en) | Hydraulic leveling system and aerial work platform | |
| CN110789688A (en) | Floating dock for maintaining movable ship plate and method for maintaining ship bottom plate | |
| CN214617257U (en) | Hydraulic system for lifting mechanism | |
| CN105465100A (en) | Pressure testing device and pressure testing method for cabin opening oil cylinder | |
| CN109374500A (en) | A kind of double load etch test devices | |
| JPS611900A (en) | Turbid liquid transferring apparatus | |
| CN108827789A (en) | A kind of hydraulic press rapid water filling system and its control method | |
| CN204613039U (en) | Interior pull-type UHV (ultra-high voltage) Hydrostatic Tester for Big Diameter Welding Pipe and hydraulic system thereof | |
| CN204140547U (en) | Open the cabin the pressure experimental device of oil cylinder | |
| CN210793576U (en) | Floating dock for maintaining movable ship board | |
| CN108100920B (en) | Synchronous lifting jack and jack hydraulic system | |
| CN102407928B (en) | Hydraulic lift chimney for ship | |
| CN220690357U (en) | Air tightness and strength test system for buffer strut of undercarriage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |