470results about "Vessel hatches/hatchways" patented technology

The utility model relates to the technical field of ships, in particular to a ship hatch cover convenient to open and close. The device comprises a hatch cover installed on a hatch through a rotating seat, the hatch cover is provided with a light energy power generation assembly and a battery protection shell, a battery is arranged in the battery protection shell, and the light energy power generation assembly is electrically connected into the battery; a vacuum locking structure and an air pressure unlocking structure are arranged in the cabin cover, an inductive switch is arranged on the inner side of the cabin cover, a handle is arranged on the cabin cover, and an opening button connected with the air pressure unlocking structure is arranged in the handle; according to the device, a vacuum locking structure is designed, the hatch cover is fixed in a low-pressure adsorption mode, a miniature vacuum pump is used for exhausting air, manual operation is not needed through control of an inductive switch, and use is convenient and fast; an air pressure unlocking structure is designed, so that complicated manual operation is not needed; the solar power generation assembly is designed, solar energy is used for power generation, and therefore independent operation is achieved, external power supply is not needed, and stable operation can be guaranteed under special conditions.

The cargo hold hatch cover of the bulk cargo ship comprises a ship body, a cargo hold is arranged in the ship body, telescopic hatch covers are arranged on the two sides, located above an opening of the cargo hold, of the ship body, a fixed hatch cover is arranged on the side, located on the outer side of the opening of the cargo hold, of each telescopic hatch cover, and a containing cavity is formed in each fixed hatch cover. By means of the structure, the problems that the driving mode of the cabin cover is not convenient enough, and the space utilization rate of the cabin cover is not high enough are solved.

The utility model relates to a weather-tight hatch cover of a cable cabin. The weather-tight hatch cover comprises a plurality of hatch cover units, a first lock catch group and a second lock catch group, a coaming is erected on the periphery of the cable outlet opening, lifting lugs are arranged on the two sides of the top face of each hatch cover unit respectively, the hatch cover units are combined together to be laid on the coaming, and the adjacent hatch cover units are detachably connected together through first lock catch sets. The outer edge of the hatch cover unit and the coaming are detachably connected together through a second lock catch set. The integral hatch cover in the prior art is split into a plurality of hatch cover units, when the hatch cover is assembled or disassembled, the hatch cover units can be combined or disassembled in sequence, each hatch cover unit is light in weight, convenient to assemble and disassemble and capable of being quickly assembled and disassembled by a single person, and the safety is also improved. And the size of the single hatch cover unit is small, a plurality of hatch cover units can be stacked together, the occupied space is small, and the deck space is saved.

A transfer system connectable to an offshore structure. The transfer system has a transfer device connectable to a connector box on the offshore structure. The transfer device has a tensile element. The transfer device is defined with a lower section and an upper section, where the tensile element is removed from at least parts of the upper section. The transfer system further has a hang-off device with a base mechanically connectable to the offshore structure. The hang-off device has a first element pivotably connected to the base at a first pivoting axis. The lower section is suspended from the first element into a wet zone of the offshore structure while the upper section is extending above the first element into a dry zone of the offshore structure.

The utility model discloses an A60 fireproof door for a marine ship, which comprises a left door leaf and a right door leaf which are respectively arranged on a door frame through hinges. The door frame, the left door leaf and the right door leaf are each of a structure formed by splicing a plurality of plates. The door frame, the left door leaf and the right door leaf are all filled with fireproof cotton, and fireproof rubber strips and JC rubber strips are additionally arranged. The fireproof door is applied to objects such as marine transportation energy storage containers. According to the utility model, the fireproof door can be used in severe working conditions on the sea through typical marine transportation parts; the fireproof door steel plate frame is filled with fireproof cotton to ensure that the fireproof grade is met; the door slot gap is reasonable, the fireproof door can be opened even if the fireproof door deforms while the airtightness is met, flame retardance and heat resistance are effectively achieved, and smoke is prevented from overflowing; the bottom end of the door lock is changed into a crescent lock head and a matched lock seat from a bolt type structure, so that the situation that the door is difficult to open due to deformation is further reinforced.

The utility model discloses a ship hatch cover, which comprises a hatch cover mounting seat and a hatch cover. The hatch cover is rotationally connected to the hatch cover mounting seat through a rotating shaft, and a return spring is sleeved on the rotating shaft. The hatch cover is composed of a hatch cover main body and a hatch cover main body locking mechanism mounted on the hatch cover main body. The hatch cover main body locking mechanism consists of a locking tongue, a locking tongue driving plate and a hatch door handle. The locking tongue driving plate is in a "U" - shaped structure and is inserted into the hatch cover main body from below, and the locking tongue driving plate can slide up and down. A row of driving teeth are fixedly arranged below the outer sides of the side plates on both sides of the locking tongue driving plate. A locking tongue is arranged on each side of the locking tongue driving plate, and the locking tongue is fixed on the hatch cover main body through a connecting seat. The hatch cover main body locking mechanism of the utility model combines the pulling action of the rotating hatch door with the opening and closing action of the lock, thereby reducing the steps of opening and closing the hatch door and shortening the opening and closing time.

The horizontal opening hatch cover device for the submersible comprises a hatch body, a cover body is installed on the hatch body in a sealed mode, a rotating support is installed outside the center position of the cover body through a rotating ring, a support is arranged beside the hatch body and connected with the rotating support through a rotating shaft, and the rotating support turns over around the rotating shaft. Therefore, the support is rotated to drive the cover body to be opened and closed. Two symmetrical hatch seats are installed on the hatch body, a wrench is installed on each hatch seat in a matched mode, a gear is arranged at the bottom of each wrench, arc-shaped racks are symmetrically arranged in the circumferential direction of the cover body, and the arc-shaped racks are meshed with the gears; a transmission mechanism is further installed outside the cover body and used for balancing air pressure on the two sides of the cover body, and work is stable and reliable.

The utility model relates to the technical field of ship equipment, in particular to a marine double-face opening and closing hatch cover which comprises a cover frame and a cover hinge, the cover frame and the cover hinge are both made of composite boards, each composite board comprises carbon fiber layers located on the inner surface and the outer surface, PET filler is arranged between the two carbon fiber layers, one side of the cover hinge is connected with the cover frame through a hinge, and the other side of the cover hinge is connected with the cover frame through a hinge. A double-face opening and closing handle is arranged on the cover hinge, and a locking block matched with the double-face opening and closing handle for locking is arranged on the inner wall of the cover frame. The double-sided opening and closing hatch cover for the ship is made of carbon fibers and high-strength PET materials, the weight of the whole hatch cover is obviously reduced compared with that of a steel hatch cover, the hatch cover is simple in structure and convenient to operate, welding parts are reduced, structural stability and sealing performance are guaranteed, and the hatch cover has longer service life.

The invention relates to the technical field of container ship building, in particular to a container ship hatch cover supporting cushion block adjusting method which comprises the following steps that an anti-clamping jig is manufactured; measuring a gap, and marking a part which does not meet the gap requirement; lifting the cabin cover; after the cushion block is lifted in place, the four anti-pinch jigs are stuffed between the box body of the cushion block and the cabin cover; the flow of a non-return overflow valve of the jack is turned down, pressure relief of the jack is conducted in a unified mode to enable the hatch cover to descend slowly, complete pressure relief is guaranteed, and the anti-pinch jig is stressed; the personnel increases or decreases the cushion plates of the marked cushion blocks; uniformly commanding the jack to lift the hatch cover, taking out the anti-pinch jig, and uniformly releasing the pressure of the jack to slowly descend the hatch cover; and if the clearance between the cushion block and the hatch cover still does not meet the requirement, the steps are repeated for adjusting the clearance between the cushion block and the hatch cover. The operation burden of personnel and equipment is relieved, the risk that the personnel are extruded and injured is avoided, and the safety and reliability of operation are improved.

The invention discloses a bulk cargo ship cargo hold cover and a bulk cargo ship, the bulk cargo ship cargo hold cover comprises a hatch cover and a hatch coaming, the hatch cover is arranged above an exposed deck, and the hatch coaming is embedded in the exposed deck; a first pressing strip is arranged on the exposed deck, and a first sealing part is arranged at the bottom of the hatch cover; a second pressing strip is arranged on the hatch coaming panel, and a second sealing part is arranged at the bottom of the hatch cover; a hatch cover skirt plate is fixedly arranged at the bottom of the hatch cover and arranged between the first sealing component and the second sealing component. And an inflatable pressing part is arranged on the hatch coaming vertical plate. The cargo hold cover of the bulk cargo ship has the advantage of multi-point watertight protection.

The invention relates to the technical field of ship manufacturing, in particular to a supporting device for a ship hatch cover. A hatch cover; a fixed seat; the arc-shaped arm I is fixedly mounted at one end, far away from the hatch, of the fixed seat; the arc-shaped arm II is mounted in the arc-shaped arm I in a sliding manner; the arc-shaped arm III is mounted in the arc-shaped arm II in a sliding manner; the fourth arc-shaped arm is installed in the third arc-shaped arm in a sliding mode; the adjusting assembly is arranged in the fixed seat; the auxiliary supporting assembly is arranged on the hatch cover; the connecting assembly is arranged between the other end of the fourth arc-shaped arm and the hatch cover. Compared with the prior art, by arranging the arc-shaped arm, the hatch cover can rotate to the horizontal state to be opened, the maximum opening effect is achieved, the maximum opening angle can be flexibly adjusted according to needs through the air bag and the adjusting button, and therefore the use requirements in different scenes are met, labor-saving opening of the hatch cover is achieved through the action of the L-shaped arm, and the hatch cover is convenient to use. And continuous protection is provided for emergency opening.

The invention discloses a hatch cover with a locking structure, and belongs to the technical field of ship tools, the hatch cover comprises a circular bottom plate, a cylinder is fixedly mounted on the circular bottom plate, by arranging four fan-shaped cover plates, the opening mode of a traditional hatch cover can be changed, and therefore the space needed for opening the hatch cover can be saved; through mutual cooperation of the transmission assembly and the position adjusting assembly, rapid adjustment of the position of the fan-shaped cover plate can be achieved, so that the fan-shaped cover plate rapidly covers the hatch, through arrangement of the limiting assembly, the position of the fan-shaped cover plate can be locked by limiting the rotating direction of the position adjusting lead screw, and therefore the hatch can be rapidly covered with the fan-shaped cover plate. And the overall structural strength of the hatch cover can be enhanced, so that the stability and safety of the hatch cover are guaranteed, the positions of the fan-shaped cover plates can be limited by arranging the limiting rods, and therefore relative movement between the fan-shaped cover plates is prevented.

The invention belongs to the technical field of ship manufacturing, and discloses an anti-falling device. The anti-falling device is applied to a ship deck, a hole is formed in the deck, and fasteners are arranged on the periphery of the hole. The device comprises a base and a cover plate assembly. The base is arranged on the periphery of the hole, a mounting hole is formed in the base, and the fastener can penetrate through the mounting hole to fix the base; the cover plate assembly is arranged at the top end of the base and comprises a movable cover plate and a fixed cover plate, the movable cover plate has a covering position and a folding position, when the movable cover plate is located at the covering position, the cover plate assembly can block the hole, and when the movable cover plate is located at the folding position, the cover plate assembly can form an operation hole communicated with the hole; therefore, the workpiece can enter the hole. The device not only is convenient to install, but also can effectively prevent personnel from falling off.

The invention relates to the technical field of ship composite material structures and forming, and provides a super-large-span full-composite material hatch cover plate and a preparation method thereof. The hatch cover plate comprises a lower panel, a middle layer, an upper panel and an external connecting structure; the lower panel is attached to the upper panel through the middle layer to form a hatch cover plate body, the two ends of the hatch cover plate body are connected with an external connecting structure respectively, the hatch cover plate body is rapidly and conveniently connected with the external structure through the method that the main beam and the lattice structure are combined, and the force transmission supporting effect is achieved. The preparation method of the hatch cover plate comprises the following steps: step 1, forming the lower panel; 2, preparing an intermediate layer; step 3, paving an upper panel; fourthly, the main beam is connected with an external structure; pouring according to a vacuum integral forming process to obtain the required hatch cover plate; by means of the method, the span not smaller than 5 meters can be achieved, deformation is smaller than 2 mm under the self-weight working condition, and the hatch cover plate has the advantages of being light, high in strength, high in rigidity, designable in lattice structure, low in manufacturing cost, high in forming rate, low in process risk and the like.

The invention relates to the technical field of hatch cover locking, and discloses a deep sea manned submersible hatch cover locking device, which comprises a main body, the interior of the main body is hollow, and the deep sea manned submersible hatch cover locking device further comprises an auxiliary mechanism, and the auxiliary mechanism is arranged at the top of the main body and is used for enhancing the locking strength of the main body. According to the device, the locking force between the hatch cover and the main body can be automatically enhanced along with the increase of the water depth pressure, so that the locking force of the device is stronger along with the increase of the water depth; therefore, the situation that the locking force of the bolt on the hatch cover is loosened or weakened due to continuous change and impact of the flowing direction and pressure in water when the submersible dives and sails in the water can be reduced, and the locking strength during locking can be further enhanced.

The invention relates to an intelligent monitoring type bulk cargo ship electric hatch cover in the field of ships, through infrared distance sensors arranged on the splicing end faces of a left cover and a right cover, the opening and closing gap of the hatch cover is monitored in real time, a traditional multi-person opening and closing operation mode and a manual sealing state detection mode are replaced, and the operation efficiency is improved. The operation efficiency and the accuracy of detecting the sealing performance are improved; meanwhile, through an opening and closing monitoring system comprising an alarm module, an alarm is given out in time when a local gap is too large after the cover is closed, and an operator can conduct maintenance and disposal in time conveniently; besides, through arrangement of a wedge-shaped block, a wedge-shaped strip and a hydraulic cylinder, the left cover and the right cover are extruded and limited, and the splicing pressure of a splicing gap is adjusted in cooperation with a pressure sensor, so that the sealing effect of the left cover, the right cover and a splicing sealing strip is further improved; in addition, the leakage condition of the splicing position is monitored in real time through the leakage detection mechanism, and the leakage loss is reduced.

The invention discloses a broadside loading system which comprises a cargo hold opening and closing assembly and a telescopic loading assembly, the telescopic loading assembly comprises a transverse moving frame located at the corresponding position of a hold top, and the telescopic loading assembly further comprises a power unit used for driving the transverse moving frame and a loading unit fixedly arranged on the transverse moving frame. By the adoption of the broadside loading system, the bulwark door has an upward opening working mode and a downward opening working mode when opened, the bulwark door can serve as a temporary loading platform of cargoes in the downward opening state, and an open water area space can be provided for floating cargoes at the broadside plate in the upward opening state; when the transversely-moving frame capable of transversely moving drives the loading unit to move to the position corresponding to goods, the goods can be hoisted through the steel wire rope, lifting and translation operation of the goods can be achieved through cooperation of the transversely-moving frame and the electric winch assembly, and compared with a side swing type and lifter loading and unloading system, the lifting and translation system has the advantages of being simple in structure and high in reliability and applicability.

The invention relates to the technical field of hoisting, and discloses a hatch cover hoisting structure. According to the scheme, a detachable hoisting arm is arranged on a hatch cover, the hatch cover is locked at a hoisting position through a locking piece, and the hoisting arm is mounted on the hatch cover at the hoisting position, so that the hatch cover hoisting structure can be used for hoisting materials, and the materials can enter and exit from a hatch; when the hatch cover is not used, the suspension arm is taken down from the hatch cover, the hatch cover covers the upper end of the hatch, and the deck area beside the hatch cannot be additionally occupied; compared with a traditional mode that a material crane is additionally arranged beside the hatch, the integrated design of the suspension arm and the hatch cover saves deck space, enables the deck area to be neater and smoother, does not hinder normal passing of personnel or goods on the deck beside the hatch in a non-working condition state, and improves the use efficiency of the deck.

The utility model belongs to the technical field of ship equipment, and particularly relates to a hatch cover with a good closing effect. Comprising a cabin body, a cabin cover, a pressing piece and a spring lock, the upper end of the cabin cover extends inwards to form a bearing face, the bearing face extends upwards to form a connecting face, the pressing piece is installed on the bearing face, the cabin cover is arranged on the connecting face, the pressing piece is fixed to the cabin body, the spring lock comprises a locking piece and a connecting piece, the locking piece is arranged on the cabin cover, and the connecting piece is arranged on the locking piece. And the fixing piece is arranged on the cabin body. In the practical application, the hatch cover is pressed through the pressing piece and then is locked with the hatch body in cooperation with the spring lock, it is ensured that air or water leakage can be reduced when the hatch cover is closed, and it is ensured that the spring lock can be rapidly locked in place when the locking piece is used in cooperation with the connecting piece.

The invention relates to the technical field of seaborne salvage equipment, in particular to a seaborne floating object salvage and recovery seat frame and an operation platform, the seaborne floating object salvage and recovery seat frame comprises a salvage platform, a recovery seat and the operation platform, the recovery seat and the operation platform are both installed on the salvage platform, and the recovery seat is arranged in a sliding mode in the length direction of the salvage platform. The invention aims to provide the safe and reliable seaborne floating object recovery seat frame and the operation platform, so that recovery and fixation and cabin opening rescue operation of seaborne floating objects after seaborne salvage under the high sea condition are effectively guaranteed.

The invention discloses a manhole cover for a pressurization test cabin, and relates to the related technical field of manhole covers. The manhole cover comprises a cover body used for sealing a manhole, a filling hole is formed in the surface of the cover body, a pressurizing pipe is fixedly connected to the outer side wall of the filling hole and communicates with an outlet of external air supply equipment, a pressure relief hole is further formed in the surface of the cover body, a pressure relief pipe is fixedly connected to the inner side wall of the pressure relief hole, and a pressure relief valve is fixedly installed on the pressure relief pipe. A first control valve is fixedly installed outside the pressurizing pipe, and a linkage assembly is arranged between a valve element operation part of the first control valve and a valve element operation part of the pressure release valve. The pressure release valve is arranged on the side, close to the interior of the cabin, of the cover body, so that when people are trapped in the cabin, the trapped people can automatically open the pressure release valve in the cabin, air in the cabin is exhausted outwards, the pressure rising trend in the cabin is slowed down or stopped, time is won for rescue, or the pressure in the cabin is reduced, and self-rescue is achieved.

The utility model provides a hatch cover locking mechanism which comprises a frame body, one side of the frame body is fixedly connected with a supporting base, the inner wall of the supporting base is provided with a plurality of positioning insertion openings, one side of the supporting base is provided with a first connecting base, the first connecting base is fixedly connected with a hinge, the other end of the hinge is connected with a second connecting base, and the second connecting base is provided with a plurality of positioning insertion openings. The second connecting seat is connected with the hatch cover, a plurality of movable grooves are formed in the peripheral wall of the hatch cover, a rotating shaft is fixedly installed in the hatch cover, a movable ring is fixedly connected to the rotating shaft, a plurality of movable rods are fixedly connected to the movable ring, and the movable rods are correspondingly installed in the movable grooves; a plurality of movable rods are arranged on the outer wall of the hatch cover, the movable rods are connected with a rotating ring, the rotating ring is fixedly connected to the outer wall of the hatch cover, a plurality of movable blocks are arranged on the rotating ring, and the movable blocks and the positioning inserting openings are in an assembling relation, so that the hatch cover can be conveniently and rapidly fixed, and it is ensured that the hatch cover can be kept in a stable state even in a severe environment.

The large bottom cabin door comprises a cabin section structure, lifting oil cylinders are fixed to the two sides of the bottom of the cabin section structure respectively, a vertical T-shaped guide rail is fixed to the side face, beside the lifting oil cylinders, of the cabin section structure, and a sliding butt joint hook is arranged in the vertical T-shaped guide rail; the end part of the sliding butt-joint hook is connected with the output end of the lifting oil cylinder, and the sliding butt-joint hook slides up and down in the vertical T-shaped guide rail under the driving of the lifting oil cylinder; opening and closing connecting rod mechanisms are further fixed to the two sides of the bottom of the cabin section structure, pressure-resistant door plates are assembled below the opening and closing connecting rod mechanisms, opening and closing driving mechanisms are arranged on the upper portions of the opening and closing connecting rod mechanisms, and the opening and closing driving mechanisms drive the opening and closing connecting rod mechanisms to achieve opening and closing work of the pressure-resistant door plates, so that the pressure-resistant door plates can be retracted into the submersible vehicle. The device is not influenced by a seabed flow field and internal waves, can be in linear fit with an external light shell of a submersible vehicle when sailing on the seabed, is permeable in the whole course, and ensures the high-speed sailing capability.

The utility model relates to the technical field of hatch covers, and discloses a sealed hatch cover capable of being opened and closed on two sides, which comprises an end cover and a hatch seat, the end cover is arranged at the port of the hatch seat, a plurality of handles are fixed on the end face of the end cover, a threaded pipe is fixed on the inner wall of the hatch seat, a lead screw is arranged in the threaded pipe, and the end face of the threaded pipe is provided with a screw rod. The screw rod is in threaded engagement with the threaded pipe, a penetrating rod is arranged at the end, away from the end cover, of the screw rod in a penetrating mode, a warping plate is fixed to one end of the end cover, a fixing shaft is arranged on the warping plate, a supporting part is fixed to the outer wall of the hatch seat, and the fixing shaft is connected with the end, away from the outer wall of the hatch seat, of the supporting part in a rotating fit mode; the double-face opening and closing effect of the hatch cover can be achieved, namely the hatch cover can be opened inside and outside the cabin, a user can be assisted in opening the hatch cover inside the cabin, and the situation that the hatch cover is hard to open inside the cabin due to the fact that the hatch cover is too heavy is avoided.

The present invention relates to a submarine with at least one first opening 130 between the interior of the submarine and the surrounding water area, wherein the first opening 130 is connected to a first cover 120, wherein the first opening 130 can be closed with the first cover 120, wherein the first cover 120 is rotatably mounted about a first axis of rotation 70, wherein the submarine has a first rotary drive 10, wherein the first rotary drive 10 is placed on a second axis of rotation 80 and its drive shaft is rotatably mounted thereon, wherein the first axis of rotation 70 and the second axis of rotation 80 are parallel and offset from each other, wherein the first rotary drive 10 and the first cover 120 are frictionally connected via a first linkage 20, wherein the first linkage 20 comprises a first crank 50, a first rocker arm 40 and a first coupling 60.wherein the first rotary drive 10 is frictionally connected to the first crank 50, wherein the first crank 50 is rotatably mounted about the second axis of rotation 80, wherein the first cover 120 is frictionally connected to the first rocker arm 40, wherein the first rocker arm 40 is rotatably mounted about the first axis of rotation 70, wherein the first crank 50 and the first rocker arm 40 are frictionally connected to each other via the first coupling 60, wherein the first rocker arm 40 is rotatably connected to the first coupling 60, wherein the first crank 50 is rotatably connected to the first coupling 60.

The invention relates to the technical field of feed cabin covers, and discloses a livestock transport ship feed cabin aluminum hatch cover which comprises a cabin hopper, a cabin cover and a reinforcing plate, and connecting shafts are fixedly mounted on the two sides of the periphery of the cabin cover correspondingly; a first synchronous wheel at the output end of a servo motor drives a synchronous belt, so that the synchronous belt synchronously drives multiple sets of second synchronous wheels, second bevel gears synchronously rotating at the bottoms of the second synchronous wheels synchronously drive first bevel gears correspondingly, and therefore winding rollers on the two sides of a hatch cover and a threaded rod on one side synchronously rotate; and when the two sets of winding rollers rotate, loose lifting ropes on the two sides of the hatch cover can be wound, after the reinforcing plate is separated from the hatch cover, the winding rollers are continuously wound, the hatch cover can be lifted and opened from the opening in the top of the cabin hopper, and therefore the hatch cover can be lifted and sealed. And the livestock feed in the cabin hopper can be conveniently guided.

A hull for deployment as an underwater habitable vessel is described. The hull has at least two hull wall modules connected in series to enclose an interior volume of the underwater habitable vessel. The interior volume is bounded by the hull wall modules. There is also provided a kit of parts for a hull of an underwater habitable vessel. The kit comprises at least two hull wall modules configured to be connected in series to enclose an interior volume of the underwater habitable vessel. The interior volume is bounded by the hull wall modules when connected.

The utility model discloses a linkage opening and closing type oil tank cover which comprises an oil tank cylinder, a top protruding disc is formed at the top of the oil tank cylinder, an oil tank cover body is arranged at the top of the top protruding disc, and a plurality of linkage opening and closing locking pieces are arranged on the side edges of the top protruding disc and the oil tank cover body. The linkage opening and closing type oil tank cover is characterized in that electromagnets corresponding to the linkage opening and closing locking pieces are arranged below the top protruding disc, an electric control cabinet electrically connected with the electromagnets is arranged on the side edge of the oil tank barrel, and an operation panel is electrically connected to the electric control cabinet. Linkage unlocking and locking of all locking pieces of the oil tank cover can be achieved, the opening and closing speed of the oil tank cover is greatly increased, and meanwhile the oil tank cover locking device has the advantages of being easy to operate, convenient and fast to use, adjustable in locking force and good in locking effect.

The present invention discloses a manhole cover mechanism, which relates to the technical field of container accessories, including a cover seat and a cover plate, wherein a pin lock assembly capable of being locked with the cover plate is slidably mounted on the cover seat, a power unit capable of being driven in forward and reverse directions is transmission-connected to the cover plate, a slide assembly is mounted on the cover seat, the slide assembly comprises a slide structure arranged on the cover seat, the slide structure has a first limit end and a second limit end, a sliding body is slidably adapted between the first limit end and the second limit end, the sliding body is connected to the power unit, the pin lock assembly is connected to the sliding body, and the pin lock assembly can complete the switching of the locking state as the reaction force generated by the power unit is driven in forward and reverse directions. During the whole process, the present invention does not need to control two power units separately, thereby simplifying the operation steps and improving the simplicity of operation.

A method and system for fumigating a vessel includes delivering a fumigation agent to a cargo area of ​​the vessel. In particular, the vessel may be a roll-on / roll-off vessel. In such a system, a pneumatic system is provided for maintaining a selected minimum pressure differential between a selected area of ​​the vessel above the cargo area and the cargo area such that the pressure in the selected area is greater than the cargo area. A control system may maintain the pressure differential.