136 results about "Marine engine" patented technology

The invention discloses a marine engine lightweight fault diagnosis system for a variable working condition environment. The marine engine lightweight fault diagnosis system comprises a fault simulation and data acquisition module, a progressive separation module and a double-view weighted confrontation module, constructing a fault data set containing multiple working conditions through fault simulation, and dividing the fault data set into a training set with labels and a to-be-diagnosed sample set; the progressive separation module uses the training set to train a basic model, extracts to-be-diagnosed sample features to carry out joint scoring and sorting, then uses K-Means clustering and a cross-working-condition class structure matching mechanism to adaptively estimate the number of unknown fault samples, and trains a fine classifier; and the double-view weighted confrontation module fuses the output of the auxiliary domain discriminator and the fine classifier, realizes safe and accurate migration of diagnosis knowledge to a to-be-diagnosed sample set through weighted confrontation training, and obtains a final fault diagnosis model. According to the method, the fault diagnosis precision and robustness under variable working conditions and open class environments are effectively improved.

The invention relates to the technical field of fire early warning, and discloses a marine engine room fire multi-sensor fusion automatic early warning system, which comprises a data analysis unit, a baseline adjustment unit, a data correction unit, an anomaly analysis unit, a cooperative calculation unit and a fire early warning unit, and is characterized in that the thermal state of an engine room is accurately reflected through a global working condition coefficient generated by the data analysis unit; a dynamic sensing datum line generated by the baseline adjustment unit can adapt to working condition changes in real time, the data correction unit eliminates interference and generates refining abnormal signals, the abnormity analysis unit generates a single-dimensional burst strength index through abnormal energy flux and other parameters to achieve accurate scoring, and the cooperative calculation unit and the fire early warning unit are matched with each other. According to the method, the fire early warning instruction is generated, the accuracy of multi-sensor cooperative fire discrimination is improved, meanwhile, the adaptability of the early warning scheme to dynamic working conditions is enhanced, and the accuracy of cabin fire monitoring is guaranteed.

The present application belongs to the technical field of marine engine bearing bush coating, and discloses a composite treatment method for the surface of a marine heavy-duty engine bearing bush, which comprises bearing bush substrate pretreatment, electroplating treatment, electroplating post-treatment and spraying treatment. The present application breaks through the limitation of single surface treatment technology, uses a tin-nickel alloy electroplating layer as the bottom layer to provide the bearing bush with good basic strength, toughness and impact resistance, and uses a spraying layer containing solid lubricants such as molybdenum disulfide and graphite as the surface layer to endow the bearing bush with excellent compliance, embeddability and self-lubricating performance. The combination of the two perfectly solves the technical problem that the traditional process cannot simultaneously consider strength and surface performance, and is particularly suitable for the complex working conditions of frequent start-stop and power overload of marine heavy-duty engines.

The utility model discloses an optical energy meter mounting bracket for a marine engine, and belongs to the technical field of diesel engines. The bracket mainly comprises a steel pipe, a small seat plate, a large seat plate, a trough plate seat plate and a rib plate, and adopts a connection mode of combining welding and bolt fixation. The steel pipe is welded on the exhaust collecting pipe to form a T-shaped foundation frame, the small seat plate is welded at the upper end of the steel pipe, the large seat plate is fixed on the small seat plate through bolts, and the length of the large seat plate can be adjusted to adapt to installation of different numbers of optical energy meters. The groove plate base plate is welded to the side face of the steel pipe and used for standardizing cable wiring. The rib plate is welded to the bottom of the large base plate to enhance structural strength. The solar energy meter support solves the problems that a traditional solar energy meter support is inflexible in installation and inconvenient to maintain, has the advantages of being simple in structure, convenient to install, high in adjustability and the like, can effectively improve reliability and attractiveness of installation of a solar energy meter, and is suitable for temperature monitoring systems of various marine diesel engines.

The present application relates to the technical field of bearing shell positioning, in particular to a hole system bidirectional positioning tool and method for bearing shell of marine engine. It comprises a positioning plate and a tool base, the positioning plate is fixed with the bearing shell through positioning pins, and a V-shaped groove is opened on the lower surface, and the tool base is provided with load-bearing ball plunger and positioning ball plunger. The positioning method comprises: fixing the positioning plate on the bottom of the bearing shell by the robot and hoisting it to the tool base; releasing the locking of the positioning ball plunger, so that it pops out; after positioning is completed, the load-bearing ball plunger is controlled to descend, the load is transferred to the tool base, and the positioning ball plunger is relocked. The present application is adapted to the lightweight structure of the bearing shell, and the positioning efficiency and accuracy are improved through bidirectional step positioning combined with the robot, the processing quality is guaranteed, and the operation difficulty is reduced.

A kind of marine low-pressure selective catalytic reduction denitration system regeneration method utilizes marine engine supercharger front high-temperature exhaust waste heat, to heat up to ammonium bisulfate decomposition temperature point to SCR system, to realize the regeneration of SCR system.Supercharger front high-temperature exhaust gas is introduced into SCR reactor by exhaust gas bypass valve, and the flow of high-temperature exhaust gas can be changed by adjusting the opening of exhaust gas bypass valve according to the volume of catalyst in SCR reactor and the set regeneration temperature.The invention can save the traditional engine external afterburner, significantly reduce the floor area of SCR system, simplify the operation of SCR system, and realize the full utilization of engine exhaust waste heat utilization.

The invention provides an optimization method and system for a marine engine room ventilation system, and relates to the technical field of analogue simulation, and the method comprises the steps: constructing a ventilation system simulation model of a marine engine room; according to the structure information and the working condition information of the ventilation system simulation model, determining the total heat dissipating capacity of the equipment; determining a reference ventilation quantity and a ventilation quantity area distribution table according to the total heat dissipation quantity of the equipment; setting the reference ventilation quantity and the ventilation quantity area distribution table into a ventilation system simulation model; performing fluid dynamic simulation on the ventilation system simulation model to generate a problem list; the optimal ventilation system structure parameters are optimized and determined through a swarm intelligence algorithm by taking weakening of hot spots, reduction of dead corner volume fraction reduction and weakening of a backflow path as targets. Hot spot areas in the cabin can be effectively weakened, the volume fraction of ventilation dead corners is reduced, the short-circuit backflow phenomenon is weakened, and the overall energy efficiency and design reliability of a ventilation system are remarkably improved while safe operation of equipment is guaranteed.

The invention relates to the technical field of engine manufacturing, in particular to a marine engine rack assembling and welding method and an auxiliary tool. The method comprises the following steps: sequentially standing and assembling web plates on a bottom plate of a rack and fixing by spot welding; mounting an auxiliary tool; the two ends of an adjusting rod are fixed to the two adjacent web plates correspondingly, and the top span size and perpendicularity of the web plates are sequentially adjusted through the adjusting rod; the side plates and the top plate of the rack are sequentially assembled, and the sizes among the web, the side plates and the top plate are adjusted and fixed through positioned welding; and the adjusting rod and the auxiliary tool are detached, and the auxiliary tool is taken out from the side face hole of the rack. The problems that in the prior art, potential safety hazards of climbing operation are large, the position and size of a web are difficult to adjust, and the production efficiency is low due to the fact that tools are inconvenient to remove are solved, and therefore safe, efficient and accurate rack assembling and welding are achieved.

The application discloses a nano-structure thermal protection coating for hydrogen fuel gas turbine and a preparation method thereof. The nano-structure thermal protection coating takes high-temperature alloy as a substrate, and sequentially deposits a bonding bottom layer, a yttrium stabilized zirconium oxide or zirconate intermediate layer and a silicate top layer on the surface of the substrate. The application starts from the design of the coating structure, and aims at the problems of low service temperature and poor water-oxygen corrosion resistance of the existing thermal protection coating for gas turbine. The water-oxygen corrosion resistance function of the silicate material is superimposed on the thermal protection coating for gas turbine, and the coating structure is optimized to form a new thermal protection coating structure resistant to high-temperature corrosion. The new thermal protection coating structure can not only meet more extreme service environments, but also resist water-oxygen corrosion at high temperature. The new thermal protection coating structure is suitable for hydrogen fuel power generation gas turbine, and is also suitable for hydrogen fuel or hydrogen mixed marine engines, hydrogen fuel rocket engines and other hydrogen fuel gas turbines.

The utility model relates to an external cylinder cover air inlet channel methanol injection switching system, and relates to the field of ship engineering and power systems. The methanol spraying device comprises a cylinder cover, a front-end switching block arranged at one end of the top of the cylinder cover, a methanol spraying device penetrating through the front-end switching block, a middle-end switching block arranged at the top of the methanol spraying device and connected with the front-end switching block, a rear-end switching block arranged on the middle-end switching block, a methanol distribution block arranged on the rear-end switching block and a methanol double-wall pipe arranged on the methanol distribution block. The alcohol spraying device is obliquely arranged above the air inlet channel and follows the air inlet direction, so that the spraying resistance is reduced; the methanol double-wall pipe is connected to the two transverse sides of the methanol distribution block, and methanol is supplied to the methanol sprayer through the middle-end adapter block and the rear-end adapter block. The external connection type design is adopted, large-scale transformation of an existing engine structure is not needed, the transformation cost and the implementation difficulty are reduced, and the engine is suitable for various types of ship engines.

This invention discloses an exhaust gas shut-off valve control device for a marine engine test platform. It includes a first exhaust gas shut-off valve, a second exhaust gas shut-off valve, and a control module. The first valve body of the first exhaust gas shut-off valve is disposed in a first exhaust gas branch pipe; the second valve body of the second exhaust gas shut-off valve is disposed in a second exhaust gas branch pipe. The control module is connected to a first drive motor of the first exhaust gas shut-off valve and a second drive motor of the second exhaust gas shut-off valve, respectively, and is used to control the association state of the first and second exhaust gas shut-off valves according to received association control commands, and to control the forward and reverse rotation states of the first and second drive motors according to the association state and received on / off control commands. When the first and second exhaust gas shut-off valves are in the association state, the on / off states of the first and second valve bodies are opposite. This invention can prevent exhaust gas backflow from the marine engine.

The utility model discloses a marine engine transport ship, which relates to the technical field of shipbuilding industry and comprises a ship body and a hatch cover, the ship body comprises a head section, a cargo compartment section and a tail section which are integrally connected in sequence, and the cargo compartment section is provided with an engine placing cavity with a top opening. The engine containing cavity is higher than a marine engine needing to be transported, and the hatch cover is used for being in rigid sealing connection with the top of the cargo hold section so as to open or seal a top opening of the engine containing cavity. The rear enclosure bulkhead comprises a fixed enclosure bulkhead and a movable enclosure bulkhead, the bottom of the movable enclosure bulkhead is hinged to the top of the fixed enclosure bulkhead, and the movable enclosure bulkhead can be overturned to the horizontal position in the direction away from the engine containing cavity and can be overturned to make contact with the fixed enclosure bulkhead, the left enclosure bulkhead, the right enclosure bulkhead and the hatch cover and be in sealed connection with the fixed enclosure bulkhead, the left enclosure bulkhead and the right enclosure bulkhead; weather tight closing of the warehouse can be achieved, the engine transportation requirement is met, loading and unloading are convenient, and the hoisting requirement of a shipyard is effectively met.

The application discloses a ship engine room infrared thermal image and vibration combined diagnosis method based on a multi-mode, relates to the technical field of mechanical equipment state monitoring, and synchronously collects infrared thermal image data and vibration data of a contact area between a bearing seat and a mounting base structure in an engine room operation process, forms an infrared thermal imaging frame sequence and a vibration signal data sequence through data processing; constructs a contact area thermal image sequence and a radial vibration attenuation sequence according to the infrared thermal imaging frame sequence and the vibration signal data sequence, and maps to a unified time axis for consistency determination; aggregates time sub-sections with inconsistent evolution rhythms to form a thermal-vibration response deviation trend, judges the thermal-vibration response deviation trend, and outputs thermal-vibration response deviation results of the contact area. The method is suitable for positioning and discriminating abnormal contact between a bearing seat and a mounting base of a ship engine room through time sequence correlation analysis of thermal image information and vibration information for combined identification of the structure contact state.

This invention discloses a method and application for anti-crack processing of diesel engine pistons, including the following steps: S1, Refined pretreatment of anti-crack special materials: Differentiated pretreatment processes are adopted for pistons made of aluminum alloy, steel, and aluminum-based composite materials to remove internal defects, refine the microstructure, and reduce residual stress. This invention constructs a complete anti-crack system from material pretreatment, precision forming, processing of easily cracked parts, stress relief, cooling optimization to quality inspection, completely blocking cracks caused by thermal fatigue, mechanical fatigue, stress concentration, corrosion, etc., increasing the crack prevention rate by more than 90% and improving the service life of pistons; at the same time, it is compatible with the processing of pistons made of different materials such as aluminum alloy, steel, and aluminum-based composite materials, and is suitable for various diesel engines such as passenger cars, commercial vehicles, marine engines, and construction machinery. The process parameters can be flexibly adjusted according to the design requirements and operating conditions of different pistons without replacing the entire set of processing equipment, thus reducing production costs.

The application discloses a kind of ship engine room fire alarm device, it is related to ship fire alarm technical field, including smoke detection equipment and fire alarm mechanism, the fire alarm mechanism includes negative pressure equipment, fine filter, oil mist filter, sampling main pipe, adapter, sampling branch pipe and sampling box;Through the fire alarm mechanism of being set, negative pressure equipment, sampling main pipe, adapter, sampling branch pipe and sampling box are used in cooperation, so that negative pressure equipment is in real time to the inside of ship engine room is extracted gas in all directions, so that the air sample of fire alarm mechanism can forcibly capture each dead angle of engine room, not by the influence of engine room strong ventilation turbulent flow field, effectively solve the problem that low concentration smoke is blown away, dilution at the initial stage of fire, passive probe cannot be reached, realize the rapid capture of smoke, gain sufficient time for fire disposal, avoid fire spread, improve the use effect of fire alarm device, effectively protect ship engine room and personnel.

The invention discloses a preparation process of a light-weight high-strength fine-grain steel piston, and belongs to the technical field of preparation of light-weight high-strength materials. According to the high-strength light-weight steel piston, 38MnVS6 steel is adopted as a finished product material, and the preparation method comprises the steps of sample upsetting and blank finish forging; carrying out friction welding treatment; performing multi-stage rapid heating and cooling heat treatment; and a tempering treatment process. The steel comprises the following chemical components in percentage by weight: 0.3 to 0.45 percent of C, 1.4 to 1.6 percent of Mn, 0.18 to 0.26 percent of Si, 0.01 to 0.015 percent of P, 0.04 to 0.05 percent of S, 0.12 to 0.2 percent of Cr, 0.08 to 0.1 percent of Cu, 0.018 to 0.026 percent of Al, 0.06 to 0.09 percent of V, 0.02 to 0.04 percent of La, 0.03 to 0.05 percent of Ce, 0.01 to 0.02 percent of Y and the balance of Fe. And finally, the lightweight piston with high tensile strength, yield strength, fatigue strength and the like is prepared, a workpiece of the lightweight piston can be used for a high-performance diesel engine or a ship engine, and the lightweight piston has a good industrial application prospect.

The invention relates to the technical field of ship maintenance equipment, in particular to a ship engine maintenance platform which comprises a bottom plate, a radial adjusting structure, a hoisting structure, an overturning structure and a supporting structure. Compared with the prior art, the lifting structure has the advantages that lifting, overturning and supporting structures are combined, the problem that a lifting structure has the falling risk is solved, the problem that an independent maintenance supporting platform cannot be subjected to multi-dimensional adjustment is solved, meanwhile, a first servo motor, a driving gear, a rotating shaft and a driven gear are arranged, and a power source is provided through the first servo motor; the first servo motor drives the driving gear fixed to the output shaft of the first servo motor to rotate, then the driven gear meshed with the driving gear rotates, the rotating shaft rotates, then the first rotating disc connected with the hoisting structure rotates, and therefore radial rotation of the hoisting structure is completed. And the multi-dimensional adjustment effect of the ship engine maintenance platform is further improved.

A method for preventing overspeeding and black smoke emission from a four-stroke marine engine under all operating conditions is disclosed, relating to the field of four-stroke marine engine control technology. This method addresses the problem of existing technologies failing to achieve full-condition fuel quantity limitation and exhibiting low control precision, leading to black smoke emission from the engine. The method involves collecting a 4-20mA current signal corresponding to the boost air pressure as the main engine load feedback signal; connecting this signal to the electronic speed controller via a shielded anti-interference link; setting fuel quantity limitation parameters according to eight speed ranges and at least eight load points in each range within a speed range of 200-1080 r / min and a boost air pressure range of 10-200 kPa, and periodically calibrating these parameters; dynamically adjusting the fuel supply using a PID control algorithm to predictively prevent speed deviations; and incorporating an abnormal alarm and a local + cloud encrypted storage module. The beneficial effects are: ensuring the engine speed remains stable within a safe range and avoiding black smoke emission caused by excessive fuel quantity under different operating conditions.

The utility model discloses a large -scale marine engine piston pin installation frock, including boom mechanism, piston pin support subassembly, piston pin axial swing mechanism and piston pin center hole expansion mechanism, and the vertical fine adjustment mechanism middle part is vertically welded to the one end of suspension arm, and the lifting eye screw is fixed on the suspension arm. The lower extreme of vertical fine adjustment mechanism is connected with the upper extreme of vertical rod, and the lower extreme of vertical rod is fixedly connected with one end of piston pin axial swing mechanism. The bottom center of V-shaped support seat is fixed on the middle part of piston pin axial swing mechanism. The piston pin is supported on V-shaped support seat, and piston pin center hole expansion mechanism is inserted into piston pin center hole and is tightly connected, and the lower extreme of piston pin center hole expansion mechanism is fixedly connected with the middle part of piston pin axial swing mechanism. The utility model is simple to operate, convenient to use, and except using the crane, only one person operation can complete the installation of piston pin, improves the installation efficiency of piston pin obviously, and effectively guarantees the assembly safety of piston pin.

This invention relates to the field of cooling device technology, and in particular to a shell-type cooling device for marine engines. It includes heat exchange tubes, with a shell surrounding the tubes for cooling. Several heat dissipation fins are arranged on the top of the shell, and an auxiliary heat dissipation mechanism for cleaning these fins is also provided above the shell. This invention, through the cooperation of the auxiliary heat dissipation mechanism, a debris removal mechanism, a drive frame, a transmission rod, a pressure plate, a swing frame, and a debris removal plate, cleans the gaps between the heat dissipation fins, effectively preventing dust accumulation in these gaps. This avoids the formation of a barrier layer due to dust accumulation, which hinders effective heat transfer between the heat dissipation fins and the air. Simultaneously, it prevents dust accumulation in the fin gaps from significantly narrowing the airflow channel and disrupting the stable airflow circulation established by the reciprocating drive of the fan, thus preventing a weakening of the overall heat dissipation capacity of the cooling device.

The invention discloses a dual-fuel ship engine tail gas treatment method, and relates to the technical field of ship engine tail gas treatment.According to the method, in the dual-fuel tail gas treatment process, a mixer is used for preposed pretreatment, necessary conditions for a catalytic reduction reaction are provided for an SCR reactor, and an ASC reactor can prevent ammonia from corroding follow-up equipment; therefore, collaborative purification and synchronous removal are achieved, the purification efficiency is larger than 90%, meanwhile, the escape amount is smaller than 5 ppm, and the high-standard emission requirement is met; and on the basis of dynamic regulation and control of temperature and reducing agent flow, tail gas characteristics of the dual-fuel engine under different loads are adapted, and meanwhile, the reaction speed and the catalyst efficiency are in an efficient state through temperature control, so that tail gas treatment of the dual-fuel system is met.

The invention discloses a special ultrahigh corrosion-resistant high-pressure cast aluminum alloy for marine equipment and a preparation process of the special ultrahigh corrosion-resistant high-pressure cast aluminum alloy. The aluminum alloy is designed by taking aluminum as a matrix and synergistically adding silicon, magnesium, various transition elements and rare earth elements of cerium and lanthanum in a specific proportion. The preparation process sequentially comprises the steps of smelting and refining, high-pressure die casting, heat treatment and surface treatment. Through the unique component design and the systematic combination of the whole-process technology, the high-pressure casting manufacturability of the alloy is kept, meanwhile, the marine corrosion resistance and the mechanical property are comprehensively improved, and the alloy is suitable for structural parts such as marine ship engine parts in the severe environment.

The application provides a ship main engine cylinder body surface treatment process and system and a marine engine, and relates to the field of marine engine manufacturing. The application is aimed at the problem that the segmented cylinder body of a large marine engine is not convenient to implement overturning processing, which easily causes the center of gravity to deviate and collision damage. The application first folds all the cylinder bodies into a whole for rack end processing, reduces the local accumulated error caused by the thickness change of the sealing glue, then splits the whole cylinder body into multiple groups of combined cylinder bodies for separate overturning, so as to adapt to the lifting equipment capacity of the existing workshop. When splitting, the function cylinder body with a larger weight difference is arranged at the center position of the combined cylinder body, which balances the weight distribution on both sides of the special combined section, reduces the center of gravity deviation amplitude, and provides protection for the posture stability control in the turning process. While ensuring the overall machining precision of the segmented main engine cylinder body surface, the safety and engineering feasibility of the overall construction process are improved.

The utility model relates to the technical field of marine engine support bodies, in particular to a novel multifunctional electrical support for a marine engine, which comprises a base, a support body mounted above the base, a bracket mounted on one side of the support body, and an engine body mounted inside the bracket. The other side of the support body is provided with a cable box used for protecting cables. The support body is provided with eight through holes, and the support body is fixed to the bracket, the engine body and the cable box through the eight through holes. A fixing assembly is installed in the cable box and used for fixing the position of a cable. A rotating rod is fixedly connected to the bottom of the support body and rotationally connected with the base. An adjusting assembly is installed in the base and used for adjusting the direction of the support body. The novel multifunctional electrical support for the marine engine provided by the utility model has the advantages of improving the cable stability, reducing the maintenance difficulty and simplifying the system layout.

The invention relates to an internal combustion engine having at least one cylinder, preferably a large marine engine having at least one cylinder with an inner diameter of at least 200 mm, and to a method for operating an internal combustion engine. The invention relates to an internal combustion engine (1) having at least one cylinder (2), preferably a large marine engine having at least one cylinder with an inner diameter of at least 200 mm, comprising an LNG supply system (10) having an LNG storage tank (11) for containing LNG, preferably at a temperature below-150 DEG C, and further comprising an exhaust gas cooling system (20). The exhaust gas cooling system (20) has a first cooling stage (21) for cooling the exhaust gas, preferably suitable for using water, such as seawater, as a cooling medium, a second cooling stage (22) for cooling the exhaust gas, arranged downstream of the first cooling stage (21), preferably cooled to a temperature of-100 DEG C to-110 DEG C, and a third cooling stage (22) arranged downstream of the second cooling stage (22) for cooling the exhaust gas, preferably cooled to a temperature of-100 DEG C to-110 DEG C, and a third cooling stage (23) arranged downstream of the second cooling stage (22) for further cooling the exhaust gas, preferably cooled to a temperature of-125 DEG C to-140 DEG C, such that CO2 freezes out of the exhaust gas and the frozen CO2 is separated from the residual exhaust gas. The second cooling stage (22) comprises at least one second stage heat exchanger (32) and the third cooling stage (23) comprises at least one third stage heat exchanger (33). The third cooling stage (23) comprises a first outlet (24) for frozen CO2 and a second outlet (25) for residual exhaust gas. At least one of the at least one second stage heat exchanger (32) and / or the at least one third stage heat exchanger (33) is adapted to use LNG cold energy, preferably LNG cold energy released from an LNG storage tank.

The invention aims to provide a marine engine intake and exhaust system fault diagnosis method based on continuous learning, and belongs to the field of engine fault diagnosis, and the method comprises the following steps: collecting and preprocessing multiple working condition data of a marine engine intake and exhaust system; constructing an initial fault diagnosis network, wherein the network structure comprises a feature extractor G and a classifier C; performing offline initial training to obtain basic model parameters; continuously learning and training based on an elastic weight consolidation mechanism; and fault diagnosis of the intake and exhaust system of the marine engine: performing real-time fault diagnosis on the intake and exhaust system of the diesel engine under different working conditions, and outputting a fault type identification result. According to the method, an elastic weight consolidation mechanism is introduced, so that when the diagnosis model sequentially learns newly-added working condition tasks, diagnosis knowledge of learned fault modes can be effectively reserved, the problem of performance degradation caused by incremental learning in a traditional method is remarkably relieved, and continuous accumulation and stable fusion of the diagnosis knowledge are achieved.

This invention provides a system and method to detect a maritime visual thermal event(s) for carried vehicles, cargo, marine engines, and machinery that acquires images with a thermal camera and also uses a maritime visual fire precursor events (smoke) based on images of a conventional camera and a computer vision algorithm that is executed on a processor. One precursor is a detectable thermal event where the surface temperature of a ship-based vehicle, cargo, engine, or machinery increases in temperature by a few degrees as recorded by a thermal camera. A second alternate precursor is the appearance of visible compact dense smoke that can be imaged by a conventional visible light camera. The system can be integrated with the existing installed hardware, operation and processes of current systems and methods for maritime event detection with appropriate thermal cameras and data transmission components, at key locations within the ship.

The invention discloses a ship engine methanol fuel supply pipeline detection device, and relates to the technical field of pipeline detection, the ship engine methanol fuel supply pipeline detection device comprises a cabinet, and the upper surface of the cabinet is fixedly provided with a panel. By arranging the case and the panel, a firm protective shell and a flat operation platform are provided for the whole detection device, the case is made of an anti-corrosion material so as to adapt to the marine environment, and the panel serves as an installation reference of each functional module; the spraying mechanism is used for rapidly injecting a detection solution into the methanol fuel supply pipeline, a first connecting frame is fixedly arranged on the outer surface of the spraying mechanism, and the first connecting frame is fixedly connected to the inner wall of the panel. By arranging the spraying mechanism and the first connecting frame, a high-pressure injection system of a detection solution is formed, the first connecting frame provides accurate mounting and positioning for the spraying mechanism, and the spraying mechanism is responsible for generating controllable pressure to quickly inject the detection solution into a to-be-detected pipeline, so that the effect of sealing and detecting a supply pipeline is achieved.

This invention provides a high-precision machining fixture for marine diesel engine cylinder liners, comprising an upper fixture, a lower fixture, and a connecting screw. The upper fixture is a single piece with screw holes at both ends. The lower fixture consists of two separate fixtures fixed to a base, each with a screw hole at its top that aligns with the screw holes in the upper fixture. The connecting screw can be positioned between the upper and lower fixtures. One side of each lower fixture is inclined, and a detachable support assembly is mounted on this inclined surface. The marine engine cylinder liner to be machined is placed on the support assembly of the lower fixture, and the upper and lower fixtures are connected by the connecting screw, effectively preventing displacement of the cylinder liner during machining. For cylinder liners of different specifications, only the upper fixture needs to be replaced; the specifications of the support assembly can be adjusted to accommodate different cylinder liner sizes, thus improving machining efficiency.

The invention relates to the technical field of bearing shell positioning, in particular to a hole system bidirectional positioning tool and method for a marine engine bearing shell. The tool comprises a positioning plate and a tool base, the positioning plate is fixed to a bearing shell through a positioning pin, a V-shaped groove is formed in the lower surface of the positioning plate, and a bearing ball plunger and a positioning ball plunger are arranged on the tool base. The positioning method comprises the steps that the positioning plate is fixed to the bottom of the bearing shell through the robot and hoisted to the tool base; locking of the positioning ball plunger is relieved, so that the positioning ball plunger pops up; and after positioning is completed, the bearing ball plunger is controlled to descend, the load is transferred to the tool base, and the positioning ball plunger is locked again. The device is adaptive to a bearing shell lightweight structure, and is combined with a robot to realize bidirectional step-by-step positioning, so that the positioning efficiency and precision are improved, the machining quality is guaranteed, and the operation difficulty is reduced.