CN109018209B - Anti-swing and wave compensation mechanism for retractable working boat under high sea condition - Google Patents
Anti-swing and wave compensation mechanism for retractable working boat under high sea condition Download PDFInfo
- Publication number
- CN109018209B CN109018209B CN201710439398.2A CN201710439398A CN109018209B CN 109018209 B CN109018209 B CN 109018209B CN 201710439398 A CN201710439398 A CN 201710439398A CN 109018209 B CN109018209 B CN 109018209B
- Authority
- CN
- China
- Prior art keywords
- swing arm
- oil cylinder
- pulley
- assembly
- boom
- 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.)
- Active
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 230000001154 acute effect Effects 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 6
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B23/00—Equipment for handling lifeboats or the like
- B63B23/02—Davits, i.e. devices having arms for lowering boats by cables or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/005—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper
- F16F13/007—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper the damper being a fluid damper
Abstract
The invention provides a compensation mechanism, which comprises a boom, a steel wire rope, a pulley assembly, a lifting swing arm assembly, a lifting hook assembly, a boom and a buffer assembly, wherein the boom is arranged on a ship, the pulley assembly is arranged on the boom, the lifting swing arm assembly is arranged on the boom, the swing arm is provided with a cavity, the steel wire rope is sleeved on the pulley of the pulley assembly in a sliding manner, one end of the steel wire rope stretches into the cavity, the lifting hook assembly is arranged on the steel wire rope stretching into one end of the cavity, the boom is hung on the lifting hook assembly and is used for suspending a work boat placed on the ship, the lifting swing arm assembly comprises the swing arms, and through the mutual position and the connection relationship between the assemblies, the boom stretches to place the work boat in the sea or revolve to the ship when the work boat swings under the action of wind and waves, and the buffer assembly is used for realizing the anti-swinging and wave compensation effects.
Description
Technical Field
The invention relates to a compensation mechanism, in particular to a compensation mechanism for preventing swinging and waves of a retractable working boat under high sea conditions.
Background
The main task of the work boat is to help the personnel on the boat to complete a plurality of important water operations. In the sea, for various reasons, the ship sometimes cannot be directly parked on the shore or the dock when encountering some problems, and at this time, a working boat is usually used as a tie between the ship and between the ship and the shore; if the ship encounters danger, the working boat can play a role of a temporary rescue boat to timely help personnel on the ship escape. Therefore, a plurality of work boats are usually provided on the boat. The main task of the work boat retraction device is to ensure that the work boat and the workers on the ship can be quickly and safely lowered onto the water surface, and the work boat and the workers are safely retracted to the ship.
Because of the specificity of high sea conditions such as surge and surge, the retraction device of the ship working boats such as life-saving ships, engineering ships, military auxiliary ships and the like has certain requirements internationally, for example, the retraction device needs to adapt to the sea conditions of several stages, the load, the time for retraction of the boats, the retraction speed, the industry standard and the like. Therefore, equipment for collecting and releasing the ship lifeboats, the working boats and the like can meet the lifting weight, time and industry standards, so that the life saving or the working boats in the lifting process can be stable and shake can be reduced to the greatest extent, and the friction and damage to the ship body and personnel can not be caused.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a sway and wave prevention compensation mechanism for a retractable working boat under high sea conditions that ensures a smooth, reduced sway during deployment and deployment of the working boat without causing rubbing and injury to the hull and personnel.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the anti-sway and wave compensation mechanism for the retractable working boat under the high sea condition comprises a suspender, a steel wire rope, a pulley assembly, a lifting swing arm assembly, a lifting hook assembly, a suspension arm and a buffer assembly; the first end of the suspender can be installed on a ship through a base of the suspender, the pulley assembly comprises a pulley and a pulley shaft pin, the pulley is installed on a second end of the suspender opposite to the first end through the pulley shaft pin, and a pulley groove is formed in the periphery of the pulley; the lifting swing arm assembly comprises a swing arm, and the swing arm is arranged on the suspender, is positioned below the pulley and is provided with a cavity in the direction of a central shaft; the first end of the steel wire rope is arranged on the suspender, the second end of the steel wire rope extends into the cavity through a pulley groove, and the swing arm is internally and slidably sleeved in the swing arm cavity; the lifting hook assembly comprises a connecting piece and a lifting hook arranged on the connecting piece, the connecting piece is arranged at the second end of the steel wire rope, and the lifting arm is hung on the lifting hook and used for hanging a working boat placed on the ship or at sea; the buffer assembly comprises an inner oil cylinder, an outer oil cylinder, a first elastic piece and a second elastic piece; one end of the inner oil cylinder is provided with a boom fixing part fixed with the boom, the other end of the inner oil cylinder is provided with an end cover, and the end cover is provided with a miniature oil hole; one end of the outer oil cylinder is movably sleeved on the inner oil cylinder, the other end of the outer oil cylinder is provided with a swing arm fixing part which is fixed with the swing arm, a piston is arranged in the outer oil cylinder and comprises a positioning rod and a baffle plate, one end of the positioning rod is connected with the swing arm fixing part of the outer oil cylinder on the swing arm, the free end part of the positioning rod penetrates through the end cover and then stretches into the inner oil cylinder, and the baffle plate is arranged at the free end of the positioning rod and is contained in the inner oil cylinder; the first elastic piece is arranged in the inner oil cylinder, one end of the first elastic piece is fixed on the inner wall of one side of the boom fixing part of the inner oil cylinder, and the other end of the first elastic piece is fixed on the baffle; the second elastic piece is sleeved on the positioning rod, one end of the second elastic piece is fixed on the end cover, and the other end of the second elastic piece is fixed on the inner wall of one end where the outer oil cylinder swing arm fixing part is located.
The invention has the following beneficial effects:
when the working boat is required to be placed in the sea or withdrawn from the sea, the hanging rod stretches, so that the working boat is placed in the sea or rotated to the ship, in the process, the three-dimensional shaking of the working boat is converted into planar shaking due to the actions of the swing arm assembly and the like, and when the swing arm swings due to the action of wind and waves, the swing arm is buffered by the buffer assembly, so that the anti-shaking and wave compensation actions are realized.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a preferred embodiment of a compensation mechanism.
Fig. 2 is a cross-sectional view of the damper assembly of fig. 1.
Description of the main reference signs
| Compensation mechanism 100 | Boom 10 | Wire rope 20 |
| Pulley assembly 30 | Lifting swing arm assembly 40 | Hook assembly 50 |
| Boom arm 60 | Damper assembly 70 | Projections 11 |
| Pulley 31 | Pulley pin 32 | Swing arm 41 |
| Swing arm shaft pin 42 | Cavity 411 | Connecting piece 51 |
| Hook 52 | Inner cylinder 71 | Outer cylinder 72 |
| First elastic member 73 | Second elastic member 74 | Boom fixing section 711 |
| End cap 712 | Miniature oil hole 7121 | Swing arm fixing portion 721 |
| Piston 722 | Positioning rod 7221 | Baffle 7222 |
| Swing arm inner slide 43 |
The invention will be further described in the following detailed description in conjunction with the above-described figures.
[ detailed description ] of the invention
Referring to fig. 1 and 2, in a preferred embodiment of the present invention, a compensating mechanism 100 comprises a boom 10, a wire rope 20, a pulley assembly 30, a swing arm assembly 40, a hook assembly 50, a boom 60, and a damper assembly 70.
The first end of the boom 10 can be mounted by its base on a vessel, and a second end opposite the first end extends upwardly with a projection 11 corresponding to the pulley assembly 30. The pulley assembly 30 includes a pulley 31 and a pulley shaft 32, and the pulley 31 is mounted on the second end of the hanger rod 10 through the pulley shaft 32 and has a pulley groove formed at the outer circumference thereof. The lifting swing arm assembly 40 includes a swing arm 41 and a swing arm shaft pin 42. The upper end of the swing arm 41 is rotatably mounted on the second end of the boom 10 through the swing arm shaft pin 42 and is positioned below the pulley assembly 30, and the swing arm 41 is provided with a cavity 411 in the central direction thereof. The first end of the steel wire rope 20 is installed on the suspender 10, the second end of the steel wire rope extends into the cavity 411 after passing through the pulley, and the swing arm inner sliding sleeve is in the swing arm cavity.
The hook assembly 50 includes a connector 51 and a hook 52, the connector 51 is mounted on the second end of the wire rope 20, and the hook 52 is mounted under the connector 51 by a conventional manner, such as screw locking, welding or integral molding. The boom 60 is suspended from the hook 52 and has an outer diameter less than the inner diameter of the cavity 411. The boom 60 is capable of hanging a work boat mounted on the vessel at its lower end. Further, the hook assembly 50 and the suspension arm 60 are sleeved with an inner swing arm sliding sleeve 43, and the inner swing arm sliding sleeve 43 is located in the cavity 411, is slidably attached to the inner wall of the cavity 411, and can slide along with the sliding of the hook assembly 50 and the swing arm 60 relative to the cavity 411.
With continued reference to fig. 2, the damper assembly 70 includes an inner cylinder 71, an outer cylinder 72, a first elastic member 73 and a second elastic member 74. One end of the inner cylinder 71 is provided with a boom fixing part 711, the other end is provided with an end cover 712, and the end cover 712 is provided with a micro oil hole 7121.
One end of the outer cylinder 72 is movably sleeved on the inner cylinder 71, and the other end is provided with a swing arm fixing part 721. A piston 722 is disposed in the outer cylinder 72, and the piston 722 includes a positioning rod 7221 and a baffle 7222. One end of the positioning rod 7221 is connected to the end of the swing arm fixing portion 721 of the outer cylinder 72, the free end portion passes through the end cover 712 and then extends into the inner cylinder 71, and the baffle 7222 is mounted on the free end and is accommodated in the inner cylinder 71. The piston 722 has a T-shaped cross-section.
The first elastic member 73 is installed in the inner cylinder 71, and has one end fixed to an inner wall of the inner cylinder 71 on the side where the boom fixing portion 711 is located and the other end fixed to the barrier 7222. The second elastic member 74 is sleeved on the positioning rod 7221, and has one end fixed to an outer wall of the end cover 712 of the inner cylinder 71 and the other end fixed to an inner wall of the end of the swing arm fixing portion 721 of the outer cylinder 72. Preferably, central axes of the inner cylinder 71, the outer cylinder 72, the piston 722, the first elastic member 73 and the second elastic member 74 coincide. Preferably, the outer diameter of the inner cylinder 71 corresponds to the inner diameter of the outer cylinder 72, so that the inner cylinder 71 and the outer cylinder 72 can be closely attached, and the outer diameter of the baffle 7222 corresponds to the inner diameter of the inner cylinder 71 and is larger than the outer diameter of the positioning rod 7221.
The boom fixing part 711 of the damper assembly 70 is fixed to the boom 10 by a shaft pin, the swing arm fixing part 721 is fixed to the swing arm 41 by a shaft pin, and the center axis of the inner cylinder 71 is at an acute angle with respect to the boom 10 and an acute angle with respect to the center axis of the swing arm 41.
The mechanism is mainly used for directly hoisting the working boat at the front end part of the boom 10 of the working boat retraction device. When the boom 10 of the retraction device extends to lift the working boat from the ship and put the working boat into the sea through the rotation of the device, or the boom 10 extends to lift the working boat from the sea and put the working boat into the working boat rack of the slipway through the rotation of the device, when the ship sails on the sea surface with high sea conditions, the ship body shakes and shakes very severely, the impact force is also very large, the phenomenon that the lifted working boat is driven to shake greatly and even collide with other equipment and personnel on the ship side or the slipway can not be avoided, and particularly, the situation that waves strike the working boat when the working boat approaches the sea surface can be avoided, the anti-sway device and the wave compensation device need to be well so as to avoid accidents. With the present invention, when the work boat is required to be put into or withdrawn from the sea, the boom 60 is moved to lift the work boat, the boom 10 is extended, and the work boat is put into or turned onto the ship, and in this process, the swing arm 41 converts the three-dimensional swing of the work boat subjected to the wind and wave action into the planar swing, and is subjected to the buffering action of the buffer assembly 70, thereby achieving the anti-swing and wave compensation actions.
The foregoing description is directed to the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the invention, and all equivalent changes or modifications made under the technical spirit of the present invention should be construed to fall within the scope of the present invention.
Claims (2)
1. A compensation mechanism for preventing rocking and wave of a retractable working boat under high sea conditions is characterized in that: the compensating mechanism comprises a suspender, a steel wire rope, a pulley assembly, a lifting swing arm assembly, a lifting hook assembly, a suspension arm and a buffer assembly; the first end of the suspender can be installed on a ship through a base of the suspender, the pulley assembly comprises a pulley and a pulley shaft pin, the pulley is installed on a second end of the suspender opposite to the first end through the pulley shaft pin, and a pulley groove is formed in the periphery of the pulley; the lifting swing arm assembly comprises a swing arm, and the swing arm is arranged on the suspender, is positioned below the pulley and is provided with a cavity in the direction of a central shaft; the first end of the steel wire rope is arranged on the suspender, and the second end of the steel wire rope extends into the cavity through the pulley groove and is sleeved in the pulley groove in a sliding manner; the lifting hook assembly comprises a connecting piece and a lifting hook arranged on the connecting piece, the connecting piece is arranged at the second end of the steel wire rope, and the lifting arm is hung on the lifting hook and used for hanging a working boat placed on the ship or at sea;
the buffer assembly comprises an inner oil cylinder, an outer oil cylinder, a first elastic piece and a second elastic piece; one end of the inner oil cylinder is provided with a boom fixing part fixed with the boom, the other end of the inner oil cylinder is provided with an end cover, and the end cover is provided with a miniature oil hole; one end of the outer oil cylinder is movably sleeved on the inner oil cylinder, the other end of the outer oil cylinder is provided with a swing arm fixing part which is fixed with the swing arm, a piston is arranged in the outer oil cylinder and comprises a positioning rod and a baffle plate, one end of the positioning rod is connected with the inner wall of one end of the swing arm fixing part of the outer oil cylinder, the free end part of the positioning rod penetrates through the end cover and then stretches into the inner oil cylinder, and the baffle plate is arranged at the free end of the positioning rod and is contained in the inner oil cylinder;
the first elastic piece is arranged in the inner oil cylinder, one end of the first elastic piece is fixed on the inner wall of one side of the boom fixing part of the inner oil cylinder, and the other end of the first elastic piece is fixed on the baffle; the second elastic piece is sleeved on the positioning rod, one end of the second elastic piece is fixed on the end cover, and the other end of the second elastic piece is fixed on the inner wall of one end where the outer oil cylinder swing arm fixing part is located;
the compensating mechanism further comprises an inner swing arm sliding sleeve, wherein the inner swing arm sliding sleeve is assembled outside the lifting hook assembly and the lifting arm, is positioned in the cavity and is in sliding fit with the inner wall of the cavity;
the central axes of the inner oil cylinder, the outer oil cylinder, the first elastic piece and the second elastic piece are overlapped; the central shaft of the inner oil cylinder forms an acute angle with the central shaft of the swing arm and forms an acute angle with the suspender;
the second end of the suspender extends upwards to form a bulge, and the pulley shaft pin is arranged on the bulge;
the lifting swing arm assembly further comprises a swing arm shaft pin, and the upper end of the swing arm is rotatably arranged on the suspender through the swing arm shaft pin;
the outer diameter of the inner oil cylinder is equal to the inner diameter of the outer oil cylinder;
the outer diameter of the baffle is equal to the inner diameter of the inner oil cylinder and is larger than the outer diameter of the positioning rod.
2. The sway and wave prevention compensation mechanism of a retractable airship under high sea conditions according to claim 1, wherein: the piston has a T-shaped cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710439398.2A CN109018209B (en) | 2017-06-12 | 2017-06-12 | Anti-swing and wave compensation mechanism for retractable working boat under high sea condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710439398.2A CN109018209B (en) | 2017-06-12 | 2017-06-12 | Anti-swing and wave compensation mechanism for retractable working boat under high sea condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109018209A CN109018209A (en) | 2018-12-18 |
| CN109018209B true CN109018209B (en) | 2024-02-02 |
Family
ID=64629193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710439398.2A Active CN109018209B (en) | 2017-06-12 | 2017-06-12 | Anti-swing and wave compensation mechanism for retractable working boat under high sea condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109018209B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110294071B (en) * | 2019-07-24 | 2020-09-01 | 上海大学 | Variable-rigidity distribution and recovery device carried on ship body |
| CN112026997B (en) * | 2020-08-06 | 2021-09-10 | 上海外高桥造船有限公司 | Lifeboat lifting device for ocean-going passenger ship |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0572900U (en) * | 1992-03-10 | 1993-10-05 | 日東工器株式会社 | Arm jump prevention device for cargo handling balancer |
| KR960013719U (en) * | 1994-10-11 | 1996-05-17 | 최종호 | Multi-function suspension damper with built-in suspension spring |
| JP2000110880A (en) * | 1998-08-06 | 2000-04-18 | Kayaba Ind Co Ltd | Operating oil recovery device and method for hydraulic shock absorber |
| JP2008075818A (en) * | 2006-09-22 | 2008-04-03 | Nhk Spring Co Ltd | Pull gas spring and pull gas spring unit for railway wires |
| CN201647085U (en) * | 2010-02-05 | 2010-11-24 | 射阳远洋船舶辅机有限公司 | Quick boat recovery and release installation |
| CN103939515A (en) * | 2014-04-22 | 2014-07-23 | 广西大学 | Independent hydraulic anti-rotation buffer damper used for crane hook |
| CN105782331A (en) * | 2015-04-24 | 2016-07-20 | 无锡比德希减震阻尼技术有限公司 | Heavy-duty damper for heavy industries and roads |
| CN105917064A (en) * | 2013-11-21 | 2016-08-31 | 斯塔比勒斯股份有限公司 | Systems and methods for piston assemblies |
| CN206826878U (en) * | 2017-06-12 | 2018-01-02 | 上海健康医学院 | The anti-compensation mechanism waved with wave of folding and unfolding dink under a kind of high sea situation |
-
2017
- 2017-06-12 CN CN201710439398.2A patent/CN109018209B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0572900U (en) * | 1992-03-10 | 1993-10-05 | 日東工器株式会社 | Arm jump prevention device for cargo handling balancer |
| KR960013719U (en) * | 1994-10-11 | 1996-05-17 | 최종호 | Multi-function suspension damper with built-in suspension spring |
| JP2000110880A (en) * | 1998-08-06 | 2000-04-18 | Kayaba Ind Co Ltd | Operating oil recovery device and method for hydraulic shock absorber |
| JP2008075818A (en) * | 2006-09-22 | 2008-04-03 | Nhk Spring Co Ltd | Pull gas spring and pull gas spring unit for railway wires |
| CN201647085U (en) * | 2010-02-05 | 2010-11-24 | 射阳远洋船舶辅机有限公司 | Quick boat recovery and release installation |
| CN105917064A (en) * | 2013-11-21 | 2016-08-31 | 斯塔比勒斯股份有限公司 | Systems and methods for piston assemblies |
| CN103939515A (en) * | 2014-04-22 | 2014-07-23 | 广西大学 | Independent hydraulic anti-rotation buffer damper used for crane hook |
| CN105782331A (en) * | 2015-04-24 | 2016-07-20 | 无锡比德希减震阻尼技术有限公司 | Heavy-duty damper for heavy industries and roads |
| CN206826878U (en) * | 2017-06-12 | 2018-01-02 | 上海健康医学院 | The anti-compensation mechanism waved with wave of folding and unfolding dink under a kind of high sea situation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109018209A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106044585A (en) | Offshore wind turbine integral hoisting device with multi-degree of freedom compensation | |
| CN103640987A (en) | Folding arm hydraulic crane | |
| CN109018209B (en) | Anti-swing and wave compensation mechanism for retractable working boat under high sea condition | |
| CN204623778U (en) | Suspension type wharf boarding ladder | |
| CN203558761U (en) | Hydraulic knuckle crane | |
| CN107487424B (en) | Method and equipment for recovering spacecraft at sea | |
| CN210313246U (en) | Self-balancing hoisting apparatus and fire fighting device | |
| CN210710364U (en) | Unhooking-proof lifting machinery lifting hook | |
| CN206826878U (en) | The anti-compensation mechanism waved with wave of folding and unfolding dink under a kind of high sea situation | |
| CN111661772A (en) | Diving equipment drags hoisting accessory | |
| CN201961951U (en) | Internal operation free large cylinder sling | |
| CN205892567U (en) | Marine fan integral hoisting device of multi freedom compensation | |
| CN108298029A (en) | A kind of UUV lays recycling protective device | |
| CN201686393U (en) | Derrick mast hoisting tool | |
| CN109678053A (en) | Crane temporary support lifting beam tool method for dismounting | |
| CN211971573U (en) | Double-arm tower crane | |
| CN210973657U (en) | Marine crane with fixing device | |
| CN103640972A (en) | Crane hook fixing device | |
| CN209024032U (en) | A kind of above-water hoisting power tool | |
| CN220432144U (en) | Swing-preventing device for hanging boat | |
| CN207142688U (en) | A kind of boom hoisting of pot superstructure | |
| CN213200027U (en) | Large-scale boat sling device under space restriction | |
| CN204897153U (en) | Slings for lifting loads | |
| CN204265310U (en) | A kind of ship hoisting crane | |
| CN217398215U (en) | A foldable hoist device for unmanned ship |
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 |