99results about "Hull parts" patented technology

The invention discloses an underwater robot with a splicing function and a method thereof, and belongs to the field of underwater robots, the underwater robot comprises a waterproof shell, a sensing module, a main control module, a power supply module and a rotary splicing module; the sensing module is used for environment sensing, the main control module is used for decision control, the power supply module provides energy support, the rotary splicing module is a core module of the robot, a rotary telescopic mechanism comprising a rotary shaft telescopic arm and a limiting rotor is creatively provided, and the rotary telescopic mechanism can be matched with limiting grooves in waterproof shells of other single robots. And splicing of the underwater robot is realized. According to the scheme of combining the underwater robot through the rotary splicing mechanism, independent operation or group operation can be selected according to the use scene, the combination shape can be switched during group operation to meet the task requirement, and the group task which cannot be completed by a traditional individual robot is achieved; therefore, the adaptability and execution capability of the underwater robot to complex tasks and environments are improved.

The invention relates to a wing-shaped structure hydrodynamic noise control device with a heated internal wall surface and a porous medium coated outside, and belongs to the field of ship vibration noise control. The device comprises a wing-shaped structure trailing edge, a heat insulation layer, a heat preservation layer, a first electric heating piece, a first temperature sensor, a second temperature sensor, a second electric heating piece, a third temperature sensor, a fourth temperature sensor, a first outer covering porous medium, a second outer covering porous medium, a third outer covering porous medium, an electric heating piece controller and a first fixing bolt. A second fixing bolt, a third fixing bolt and a fourth fixing bolt. According to the characteristic that the control effect of wall surface heating and the porous medium is mainly influenced by viscosity, a combined control device of internal wall surface heating and outer coating of the porous medium is provided, and hydrodynamic noise generated by flow separation of the trailing edge of the airfoil structure can be remarkably reduced.

The invention belongs to the technical field of ship body assembly, and particularly discloses a modular assembly type backhoe dredger and an assembly method.The modular assembly type backhoe dredger comprises a first ship body, a second ship body, a third ship body, a fourth ship body and a fifth ship body; the first ship body, the second ship body, the third ship body, the fourth ship body and the fifth ship body are connected in an assembled mode through a plurality of positioning parts to form an assembled ship body, a plurality of clamping grooves are formed in the top face of the assembled ship body, vertical pins are inserted into the clamping grooves, and side edges corresponding to the vertical pins are arranged on the inner side walls of the clamping grooves. Through cooperation of positioning pins and positioning plates, the first ship body, the second ship body, the third ship body, the fourth ship body and the fifth ship body are conveniently and preliminarily assembled and connected, second elastic pieces are matched to limit swing plates, rotating rollers are matched with sleeve plates through the swing plates, vertical pins are conveniently and vertically inserted into clamping grooves, and meanwhile the vertical pins are prevented from being pulled out of the clamping grooves; and the overall stability of the assembled ship body is ensured.

The utility model relates to the technical field of light ships, and provides a modular structure of an electric kail ship, which comprises a ship body, and an accelerator, a propeller assembly and a power supply which are arranged on the ship body, and is characterized in that a bottom plate of the ship body is provided with a connecting assembly mounting groove which is communicated up and down; the thruster assembly comprises a thruster and a connecting assembly, a signal line of the accelerator and a power line of the power source are in butt joint with a signal line and a power line of the thruster through connectors respectively, the thruster is directly or indirectly fixedly connected with the connecting assembly, and the connecting assembly is installed in the connecting assembly installation groove. According to the utility model, the defects in the prior art are overcome, the design is reasonable, the maintenance is convenient, and the technical problems that the propeller, the battery, the accelerator and the ship body of the Karting ship are fixed by adopting a soldering tin connecting wire welding mode and are sealed by sealant in the prior art, so that the follow-up disassembly and maintenance are difficult are solved.

The application discloses a kind of marine carbon fiber warp knits and its preparation method application, carbon fiber reinforced resin composite material, belong to carbon fiber composite material technical field, solve the problem of existing technology in the forming of ship large curved surface workpiece Fabric is easy to shrink, resin infiltration efficiency is low.The marine carbon fiber warp knits includes at least two carbon fiber yarn sheets, the carbon fiber yarn sheet is formed by carbon fiber yarn spread yarn flat cross section;At least two carbon fiber yarn sheets are stacked along the thickness direction, and the lay angle of adjacent carbon fiber yarn sheet constitutes asymmetric lay structure;The carbon fiber yarn sheet is stitched by warp knitting thread, and the stitching density of the warp knitting thread is 8-14 roots / inch.The marine carbon fiber warp knits can realize width variation <5mm, resin rapid and uniform infiltration, improve the forming quality and efficiency of ship large curved surface workpiece.

The invention relates to the technical field of submarine cable maintenance ships, and particularly discloses a submarine cable maintenance ship and an operation method thereof.The submarine cable maintenance ship is provided with a cable disc and a submarine cable maintenance device on a deck, the cable disc can selectively store submarine cables or stones, the deck is provided with a moon pool, and the stone throwing device comprises a lifting assembly and a stone throwing assembly; the lifting assembly is detachably installed in the moon pool, the riprap assembly comprises a plurality of riprap pipes connected end to end, the lifting assembly is used for driving the riprap pipes to ascend and descend, and when the cable tray stores the stones, the bucket machine is used for grabbing the stones in the cable tray to the riprap pipes. A cable disc is arranged to selectively store submarine cables or stones, a moon pool is arranged on a deck, a lifting assembly is installed on the moon pool, a stone throwing pipe of a stone throwing assembly is driven to ascend and descend through the lifting assembly, the stones in the cable disc are grabbed to the stone throwing pipe through a bucket machine, the stones are thrown to the seabed through the stone throwing pipe, and therefore the requirements for submarine cable overhauling and stone throwing operation are met; and the riprap precision of the deep operation water depth is improved, and stone waste is reduced.

The invention belongs to the technical field of ship and ocean engineering, and discloses a connecting structure, a fatigue design method of the connecting structure and a semi-submersible platform. The connecting structure comprises a panel and two external toggle plates, the two external toggle plates are arranged in parallel in a spaced mode in the length direction of the intersecting line, each external toggle plate is fixedly connected to a deck box and a stand column, the external toggle plates, the deck box and the stand column are perpendicular to one another, and one of the two external toggle plates is arranged at the end of the intersecting line; the panel is fixedly connected to the two external toggle plates, a closed space is defined by the panel, the deck box, the stand column and the two external toggle plates, and a reinforcing assembly is fixedly connected into the closed space. The panel, the deck box, the stand column and the two external toggle plates of the connecting structure define a closed space, the box-type multi-toggle-plate connecting structure is formed, stress concentration of key nodes of the semi-submersible platform is reduced, and the fatigue life is prolonged; the reinforcing assembly is arranged in the closed space, and the external structure is simple and attractive.

The application discloses a method for preparing Ti80 titanium alloy flat ingot based on an electron beam cold bed furnace and high return material melting and casting, uses Ti80 titanium alloy return material as raw material, uses VAR ingot cutting material as VAR compensation material, and optimizes the material distribution structure, so that the EB melting element burning loss is precisely controlled, the Ti80 titanium alloy flat ingot with qualified and controllable components is prepared by using a large proportion of Ti80 titanium alloy return material, the component unevenness problem under the high return material ratio is solved, and core technical support is provided for short process manufacturing of Ti80 plate.

A method for maintaining physical assets based on recommendations generated from operational data analysis and a composite model representing multiple models of the physical assets includes: constructing the composite model by a computing device using a port-reduced static condensed reduction primitive approximation with respect to at least a portion of a partial differential equation; the computing device analyzing error indices associated with at least one model within the composite model to determine if the error indices exceed a tolerance level, and accordingly increasing the number of basis functions in the port-reduced static condensed reduction primitive approximation; the computing device receiving first operational data associated with at least one region of the physical asset and updating the composite model; and the computing device providing recommendations for maintaining the physical asset based on the updated composite model.

The invention relates to the technical field of aquaculture, in particular to an automatic crayfish aquatic plant planting device which comprises a hull serving as a carrier and can automatically travel in a water area for crayfish cultivation. An adjusting platform capable of adjusting the position is arranged on the ship body; the storage mechanism comprises a storage assembly which is arranged on the ship body and used for storing aquatic plants to be thrown; the storage assembly is communicated with a transfer assembly for transferring aquatic plants; the putting mechanism comprises a trimming assembly and a putting assembly which are arranged on the adjusting platform, an outlet of the trimming assembly communicates with an inlet of the putting assembly, and an outlet of the transferring assembly can communicate with the trimming assembly; the trimming assembly trims the aquatic plants, the trimmed aquatic plants enter the putting assembly, the putting assembly sends the trimmed aquatic plants to the set depth underwater, and the aquatic plants are put. According to the automatic aquatic plant throwing device, automatic and accurate throwing of aquatic plants can be achieved, human input is greatly reduced, labor intensity is reduced, throwing efficiency is improved, throwing effect is improved, and overall breeding cost is reduced.

The utility model relates to the technical field of ship equipment, and aims to solve the technical problem that an angle steel platform is too heavy. And maintenance of pipelines and cables is inconvenient. In order to solve the technical problem, the utility model provides the ship floor lifting device. The device comprises a plurality of columns of supporting assemblies, a supporting piece of the supporting assembly comprises a fixed base and a middle telescopic piece. The fixed base is connected with a deck; the length of the middle telescopic piece is adjustable; the clamping keel is connected to the top of the middle telescopic piece; clamping steps are respectively formed on the upper surface and the two side surfaces of the clamping keel; the integrally-formed floor comprises a bottom supporting piece and a rubber floor connected to the top of the bottom supporting piece. Clamping grooves are formed in the two sides of the bottom of the bottom supporting piece; the two sides of the integrally-formed floor are erected on the clamping keels of the two adjacent supporting assemblies correspondingly, and the clamping grooves are matched with the clamping steps. According to the utility model, the weight is reduced, the integrated floor can be overhauled at any position, and the maintenance is more convenient.

This invention discloses a buoyancy device for a water surface cleaning robot. In the field of water surface cleaning equipment, existing designs use two half-molded parts produced by injection molding to form a floating chamber in order for the robot to float on the water. The half-molded parts are prone to deformation, and the injection mold cost is very high, with the total injection mold cost for the robot reaching millions of yuan. The robot body includes an upper shell, a floating chamber, and a support frame. One end of the support frame is connected to the floating chamber, and the other end is connected to the upper shell. The floating chamber includes at least a first floating chamber and a second floating chamber, which are composed of tubular materials. The beneficial effect is to solve the existing technology, simplify the floating chamber and robot mechanism, and reduce the injection mold cost to tens of thousands of yuan.

The utility model discloses a double-body foldable underwater explorer, which relates to the technical field of underwater operation auxiliary equipment and comprises a floating body component, a platform, an underwater operation cabin, a positionable connecting mechanism, a lifting adjusting mechanism and a control component. The underwater operation cabin is detachably connected with the floating body assembly through the positionable connecting mechanism, the underwater operation cabin can keep the underwater preset depth under the action of the positionable connecting mechanism, and the lifting adjusting mechanism is installed on the platform, connected with the underwater operation cabin in a matched mode and used for driving the underwater operation cabin to ascend and descend so as to switch the operation state and the navigation state. The control assembly is installed on the platform or the floating body assembly. The floating body assembly bearing platform is adopted and matched with the independent underwater operation cabin, underwater preset depth fixing of the operation cabin is achieved through the positionable connecting mechanism, safety and comfort are improved, and production and assembly difficulty and transportation and storage cost are greatly reduced by being detachably folded and matched with the portable wheel set.

The invention relates to an assembly for connection between a main hull and a supporting rod and a design method of the assembly, and belongs to the technical field of ocean engineering.The assembly comprises the supporting rod, the two ends of the supporting rod are provided with a top end square block and a bottom end square block respectively, and the supporting rod abuts against a stand column of the main hull through the top end square block; the supporting rods abut against the buoyancy tanks of the main ship body through the square blocks at the bottom ends. Wherein the connecting position of the end face of the top end of the top end square block and the stand column is fixed through an upper frame, the connecting position of the end face of the bottom end of the bottom end square block and the floating box is fixed through a lower frame, and the upper frame, the top end square block, the supporting rod, the bottom end square block and the lower frame are in geometric continuity in structure. Stress distribution can be effectively optimized, the fatigue life is prolonged, construction and manufacturing are facilitated, the cost is controllable, and the defect that an existing floating type draught fan supporting rod and buoyancy tank or stand column connecting structure is difficult to design is overcome.

The invention relates to the technical field of underwater operation of submersible vehicles, in particular to a portable underwater four-foot jacking mechanism and an application method thereof. The mechanism comprises a base fixedly connected to a submersible vehicle and four unfolding and folding type supporting leg structures of the same structure. Each unfolding and folding type supporting leg structure is sequentially connected with a spiral swing hydraulic cylinder, a supporting rod, a direct-acting hydraulic cylinder and a disc type supporting foot. The supporting legs are unfolded and folded through the spiral swing hydraulic cylinders, the supporting legs are close to the broadside of the submersible vehicle in the folded state so as to reduce the sailing resistance, energy is saved, and long-distance sailing of the submersible vehicle and mechanism carrying and transporting are facilitated; after unfolding, the height of the supporting feet is adjusted through the direct-acting hydraulic cylinders, the device can adapt to the uneven underwater environment, and the bottom sitting stability of the submersible vehicle is improved; and the disc type supporting feet can adapt to the sludge environment, and the whole device has the advantages of being portable, stable, high in environmental adaptability and the like.

The utility model belongs to the technical field of marine environment monitoring equipment, and provides an in-cabin sea well working table which comprises a sea well penetrating through an in-cabin deck and partially extending upwards, a fence table fixedly arranged on the in-cabin deck, and a table plate movably covering the fence table. The sea well is arranged in the cavity of the fence table, the top height of the sea well is not larger than that of the fence table, the top of the fence table is open, and the table plate is movably arranged at the top opening. According to the in-cabin sea well workbench, the safety and convenience of using of the in-cabin sea well are improved, meanwhile, the utilization rate of the space in a cabin is increased, and in-cabin experiment detection can be conducted efficiently and orderly.

The utility model provides an underwater robot capable of being used for bridge detection, which belongs to the technical field of underwater robots and comprises a top layer plate, an interlayer plate, a bottom layer plate, a left side plate, a right side plate, a multi-beam imaging sonar, a laser range finder, an electronic sealing buoyancy providing cabin, a water link DVL and a sonar altimeter. The left side plate and the right side plate are partially hollowed out in appearance and are divided into a combined frame type structure, the side face of the robot utilizes the stability of triangles, a plurality of triangular hollows are adopted, and it is guaranteed that the robot keeps stable under strong water flow impact; the electronic sealing buoyancy providing cabin is arranged, the electronic sealing buoyancy providing cabin serves as a waterproof device for protecting the circuit board and also serves as a buoyancy device to replace a traditional buoyancy device, and the operation resistance of the robot in water can be effectively reduced in combination with the semicircular spherical cover.

The utility model discloses an unmanned ship moon pool protection device and an unmanned ship, and relates to the technical field of unmanned ship surveying and mapping, and the protection device comprises a measuring equipment fixing plate, a moon pool protection assembly, a moon pool barrel and a butterfly screw; the moon pool protection assembly comprises fixing screws, supporting frameworks, rotating shaft sheaths, rotating shaft cavities, fixing frames and three-proofing cloth, the supporting frameworks and the two ends of openings of the fixing frames are rotationally connected with the rotating shaft cavities, the supporting frameworks are alternately arranged between the two fixing frames in a long-short mode, and the rotating shaft sheaths and the rotating shaft cavities are connected through the fixing screws; the three-proofing cloth is arranged on the outer sides of the supporting frameworks, and diversion trenches are formed between the supporting frameworks. The measuring equipment fixing plate is arranged at the top of the moon pool barrel, screw holes are formed in corresponding points of the fixing frame and the measuring equipment fixing plate, and the moon pool protection assembly is connected with the measuring equipment fixing plate through butterfly screws and the screw holes. The problems that a traditional moon pool protection device is not provided with a flow guide design, the advancing resistance of a ship body is large, and the occupied space is large when the device is not used are solved.

The application discloses a kind of sightseeing ship transparent display devices, it is related to the technical field of tourism sightseeing equipment, including hull, the top of the hull is fixedly connected with cabin, the side of the hull is provided with baffle.The application can make the device more convenient to use by the joint action of hull, ship plate, fixed glass, glass plate and oxygen tank, the bottom of the hull is provided with bottom viewing space, the baffle can be automatically extended outward by being stowed, the top of the fixed glass is fixedly connected with glass plate, and the three form airtight space, the glass plate is inserted in the fixed glass, the fixed glass is composed of tempered glass, the inner groove is provided in the tempered glass, the glass plate can be connected tightly, and the bottom is also provided with connecting buckle for tight connection, to prevent the tempered glass from being damaged by impact, a protection hammer is provided on the outer surface for protection, and automatic alarm will be triggered when approaching, so that the device is more convenient to use.

A combined floating pipe structure suitable for offshore floating photovoltaic platforms is characterized by comprising a core load-bearing pipe, a buoyancy layer, and ribs; the buoyancy layer is disposed outside the core load-bearing pipe and fixed by ribs that are fixedly connected to the core load-bearing pipe. This invention employs a steel-HDPE combined structure or a steel-airbag combined structure, combining high load-bearing capacity, high stability, and high durability.

The invention discloses a foldable bridge wing which is arranged on the outer side of a navigation deck of a ship. The bridge wing shaft is connected to the driving deck; supporting devices are arranged below the bridge wings; a jumping stopping device is arranged on the supporting device; the foldable bridge wing further comprises a stand column. Steel wire ropes of the winches are connected to the bridge wings; limiting devices are fixedly arranged on the stand columns. The bridge wings can be folded as required, so that enough space is provided for loading and unloading ultrahigh and overlong goods; and the safety and the convenience when passing through a narrow river channel are ensured, and the requirement for passing through the narrow river channel can be met.

The utility model discloses a roll-on-roll-off ship ballast tank ventilation pipeline penetrating structure which comprises a ballast tank inner bottom plate and a supplement plate, a plurality of longitudinal ribs are arranged on the reverse side of the ballast tank inner bottom plate in parallel at intervals in the width direction of a ship, and the supplement plate is connected with the longitudinal ribs. And the ventilation pipeline penetrates through the supplement plate or the longitudinal bone and / or the longitudinal bone and the supplement plate. The ventilation pipeline penetrating structure of the ballast tank of the roll-on-roll-off ship is simple in connection and small in weight increase, and a ventilation pipe hole of a pipe system is reserved so that the ventilation pipe hole can transversely penetrate through a longitudinal component of the structure.

The application discloses a kind of cruise ship bulwark construction method and straightening method, wheel includes multiple bulwark pieces and deck, comprising the following steps: S1, multiple bulwark pieces are sequentially spliced to form bulwark structure;S2, deck is divided into multiple units and unit is connected with bulwark structure to form segmented structure;S3, segmented structure is sequentially connected along the length direction and height direction of cruise ship to form total section structure.Multiple bulwark pieces are spliced to form integral bulwark structure, so that adjacent two bulwark pieces are welded before being welded with deck and form whole, and deck is divided into multiple units, each unit is welded with bulwark structure to form segmented structure, at this time, bulwark structure has been welded with unit in deck, and then when unit is directly connected, the welding of each unit is away from bulwark structure and will not affect the secondary deformation of bulwark piece, so as to improve the installation efficiency and service life of bulwark structure, and the flatness of the surface of bulwark structure.

According to the detachable lifting floor supporting system for the ship and the installation method, long-strip-shaped U-shaped grooves are formed, a plurality of spring nuts are connected into the U-shaped grooves in a sliding mode, and two or more than two U-shaped grooves are spliced through connecting pieces and the spring nuts to form multiple different shapes. Before a cable is laid, a bottom-layer support is welded on a deck, the bottom-layer support is formed by laying a plurality of U-shaped grooves on the deck, a lower-layer support is erected above the bottom-layer support, an upper-layer support which is integrally in a grid shape is fixed above the lower-layer support, supporting legs are fixed above the upper-layer support, and a lifting bottom plate is laid above the supporting legs. The device is ingenious in principle, easy to manufacture, firm and durable; installation, levelness adjustment and disassembly are easy, labor is saved, and the construction period is shortened; welding operation is not needed, and the cable is not damaged in the installation process. The installation problem of the raised floor in the ship industry is solved, the requirements of no damage to the cable and high installation precision of a ship owner are met, and the device is accepted by the ship owner.

The invention relates to the technical field of wave energy power generation ships, in particular to a controllable oscillating water column type wave energy power generation ship and a method thereof.The controllable oscillating water column type wave energy power generation ship comprises a rear bent pipe ship body, an air turbine, a speed reducer, an opening and closing mechanism, a starting motor and a generator, the rear bent pipe ship body is provided with a hollow channel, and an air inlet of the air turbine communicates with an air outlet of the hollow channel; the opening and closing mechanism comprises an airflow baffle and an opening and closing driving motor, the opening and closing driving motor drives the airflow baffle to shield or open an air outlet of the air turbine, an output shaft of the air turbine is in transmission connection with an input shaft of the generator through a speed reducer, and an output shaft electromagnetic clutch is arranged on the output shaft of the air turbine. The output end of the starting motor is in transmission connection with an output shaft of the air turbine through an output shaft electromagnetic clutch. The controllable oscillating water column type wave energy power generation ship and method are good in control effect, high in reliability, not prone to damage under extreme sea conditions and high in survivability.

The utility model relates to the technical field of ship engineering, in particular to an angle-adjustable ship moon pool drag reduction device. Comprising a ship body, a moon pool, a bottom plate, a first hatch, a hydraulic rod, a baffle, a sliding groove, a mounting plate, a servo motor, a screw rod, a sliding block, a sliding groove and the like. The height of the anti-drag plate can be adjusted, the anti-drag plate is arranged at the key position of water flow, and it is ensured that a ship can keep relatively low sailing resistance under various sea conditions.

A bottom groove body of the composite material bottom groove is of a groove-shaped structure, the upper portion of the groove-shaped structure is open, the width of the groove-shaped structure is gradually reduced from top to bottom, and therefore the composite material bottom groove and a pedal which are easy to stack can be stacked in the transportation process. Therefore, the space of the cargo compartment can be fully utilized, the transportation cost is greatly reduced, meanwhile, the composite material bottom groove and the pedal which are stacked into a pile and are easy to stack can be directly stacked in the cargo compartment, a special goods shelf does not need to be adopted, the transportation cost is further reduced, the loading and unloading processes are reduced, and the loading and unloading convenience is improved. The modularized buoys of the multifunctional floating body assembly are spliced into a platform structure or a latticed structure or an annular structure which is distributed in the horizontal direction through a plurality of connecting pieces, so that various overwater floating bodies such as an overwater platform, a floating valve and an aquaculture floating mat can be obtained through flexible splicing, and the multifunctional floating body assembly is good in universality, high in structural strength and good in weather resistance.

The invention discloses an inspection robot for a smart city. The inspection robot comprises a ship body, a driving console, a mounting bottom plate, a storage mechanism, an underwater monitoring mechanism, a battery replacement mechanism and a battery charging cabinet, the storage mechanism is arranged at the top of the mounting bottom plate in the front-back direction; the two underwater monitoring mechanisms are movably arranged in the storage mechanism. The battery replacing mechanism is arranged at the top end of the ship body and located on the right rear portion of the exterior of the storage mechanism. According to the inspection robot for the smart city, full-process automation of water area inspection is achieved, long-term water area monitoring tasks can be supported through automatic battery replacement and alternate operation design, monitoring data missing caused by equipment shutdown is avoided, and the defects that in existing equipment, mechanical storage of an underwater monitoring module and a water surface platform is not synchronous, and the equipment is inconvenient to use are overcome. The defects that sealing failure or poor contact is prone to occurring during battery installation are overcome, precise control over putting and recycling of the monitoring mechanism and stable connection of battery plugging are achieved, and the reliability of overall operation of the system is improved.

The utility model relates to the field of lifeboats, in particular to a lifeboat convenient to fix, which comprises a connecting plate and a sleeve, the connecting plate is arranged behind the lifeboat, the sleeve is arranged in the connecting plate, and an inserting column matched with a cavity of the sleeve is arranged on one side of the sleeve. By arranging the oil cylinder, the piston rod and the oil bag of the locking assembly, after the inserting column is inserted into the sleeve, the inserting column can be wrapped and limited, meanwhile, in the sailing process of the lifeboat, a flowing medium in the oil cylinder can be used for providing buffering for the lifeboat, the lifeboat is prevented from colliding with one another, and the service life of the lifeboat is prolonged. Meanwhile, the connecting and fixing effect between the lifeboats can be guaranteed; by arranging the clamping shell and the positioning rod, after the inserting column is inserted into the sleeve, the stability of the inserting column can be promoted by closing the clamping shell and enabling the clamping shell to be clamped with the inserting column, and meanwhile, a guarantee can be provided for the fixing effect of a plurality of lifeboats.