97 results about "Buoyant force" patented technology

The utility model relates to the technical field of anti-floating anchor rods, and discloses a prestress anti-floating anchor rod which comprises a bottom anchoring plate, three rod bodies and a first triangular plate, the number of the rod bodies is three, and the three rod bodies are fixed to the upper end face of the first triangular plate in an annular array mode. The bottom reinforcing piece is arranged on the lower end face of the bottom anchoring plate and used for reinforcing the bottom end of the bottom anchoring plate; the rod body reinforcing piece is telescopically arranged on the rod body and is used for reinforcing from the upper section of the rod body; the three rod bodies are fixed to the first triangular plate in the annular array mode and matched with the first triangular plate and the second triangular plate, by means of the stability of a triangle, the capacity of resisting building foundation buoyancy can be improved, and the overall stability of the structure is remarkably enhanced; the pressure promotes the connecting column to rise, the top block extrudes the movable block to move outwards to be inserted into a side soil layer, the bottom stability is improved, and the anti-floating capacity is improved.

This invention discloses a passive buoyancy compensation method using gas-liquid mixing for profiling buoys, belonging to the field of buoyancy adjustment technology for marine observation buoys. This method constructs a passive buoyancy compensation system containing gas and liquid chambers, and adjusts the gas-liquid volume ratio to achieve linear and continuous adjustment of the system's equivalent compressibility coefficient, dynamically matching the compression characteristics of seawater at different depths. A mathematical model of the overall force on the buoy is established to determine system design parameters. Sensors are deployed to collect buoy depth and axial acceleration data, calculate motion parameters, predict and estimate the depth, and compare it with the target depth. When the deviation threshold is exceeded, an active fine-tuning judgment process is initiated. Active adjustment is disabled during the inertial-dominated phase, and during the non-inertial phase, the controller sends a fine-tuning command to the active buoyancy system to execute reverse buoyancy adjustment. The passive buoyancy compensation method using gas-liquid mixing provided by this invention can achieve low-power buoyancy control with passive adjustment as the primary method and active adjustment as a secondary method, effectively extending the underwater operational life of the buoy.

The utility model relates to the technical field of swim rings, in particular to an anti-water-inhaling plastic swim ring for children, which comprises a swim ring air bag, the lower surface of the swim ring air bag is fixedly connected with a seat plate, two through holes are arranged in the seat plate, the outer wall of the seat plate is fixedly connected with an auxiliary air bag, and the outer wall of the auxiliary air bag is fixedly connected with the swim ring air bag. The number of the auxiliary air bags is two, a protection structure is arranged on the upper surface of the swim ring air bag, and the protection structure comprises a first bandage and a second bandage. According to the swimming ring air bag, the two feet of a child penetrate through the through holes, the child sits on the seat plate, the protection structure is bound to the upper body of the child to be fixed, meanwhile, the two auxiliary air bags are used for suspending the swimming ring air bag to increase buoyancy, the swimming ring air bag can stably suspend on the water surface, and the situation that the child inhales water due to rollover of the swimming ring air bag is prevented; the protection structure plays a role in protecting children and prevents the children from falling from the inside of the air bag of the swim ring and inhaling water.

The utility model belongs to the technical field of hydraulic engineering equipment, and particularly relates to a water delivery pipeline mud-blocking sand-blocking water-passing anti-floating device which comprises a main body frame, a sand-blocking net, a filtering net and a supporting rod, the main body frame is arranged on the outer wall of a water delivery pipeline in a sleeved mode, and the sand-blocking net is welded to the end of the main body frame and used for blocking large-particle silt and floating objects; the reinforcing frames are distributed in a shape like a Chinese character'mi ', water flow impact force is dispersed through a cross supporting structure, the deformation resistance of the device is enhanced, and the sand blocking net is protected; the filter screen is arranged on the inner side of the sand blocking screen to intercept fine particles layer by layer, so that the pollutant intercepting capacity is improved; the supporting rods are obliquely and vertically installed to form a multidirectional stress system, and the device is effectively prevented from floating in combination with a ballasting area at the bottom of the water conveying pipeline. Through layered filtration, mechanical dispersion and modular design, the technical problems that in the prior art, the interception efficiency is low, the structure is prone to damage, maintenance is difficult, and the buoyancy resistance is insufficient are solved, and the device has the remarkable advantages of being high in interception efficiency, stable in structure, convenient to maintain, high in adaptability and the like.

The application discloses an underwater detection device and belongs to the technical field of underwater detectors. The underwater detection device comprises a sealed cabin body, side floats arranged symmetrically on both sides of the sealed cabin body, an upper float arranged on the top of the sealed cabin body and a support installed on the bottom of the sealed cabin body. A power supply and a multi-parameter detector are arranged in the sealed cabin body. A water depth detector is installed on the upper surface of the upper float. A lift propeller providing vertical propelling force is installed on the side float. An oblique propeller is installed on the support. The upper float provides top buoyancy, and the side float provides two-side buoyancy, so that the center of gravity of the sealed cabin body is deviated downward, thereby the underwater detection device can keep a positive floating attitude to the maximum extent in water, and the effect of resisting rolling and pitching is improved. Through the synergistic effect of the lift propeller and the oblique propeller, the underwater detection device has multi-degree-of-freedom attitude adjustment function, and the operation efficiency and the obstacle passing rate are improved.

The utility model relates to the technical field of anti-floating structures, and provides an anti-floating structure for basement reinforcement, which comprises an anti-floating anchor rod, a plurality of groups of fixing rings are sleeved on the anti-floating anchor rod, and every two adjacent fixing rings are arranged at intervals; a permeation plate is arranged at the top of the anti-floating anchor rod, a plurality of permeation holes are formed in the permeation plate, and a fixing anchor head is arranged at the bottom of the anti-floating anchor rod. Through the arrangement of the anti-floating anchor rod, a user can bear certain buoyancy through the anti-floating anchor rod when the water level is within a normal range, the anti-floating stability of the device is improved, after the water level exceeds the normal range, the user can drain water and relieve pressure through the permeation plate, the user can relieve hydrostatic pressure of a basement, and the water level is protected. The drainage and pressure relief capacity of the device is improved, the stability of the anti-floating anchor rod can be enhanced through the multiple sets of fixing rings, the device can better bear buoyancy, and the anti-floating performance of the device is improved.

The application discloses an anti-floating anchor rod structure for an existing building and a construction method thereof. The anti-floating anchor rod structure for the existing building is characterized by comprising a grouting anchor rod, an anchoring plate and a locking structure. The grouting anchor rod is a steel pipe, one open end of the grouting anchor rod is a grouting opening, the pipe wall of the steel pipe is provided with a grouting hole and a grout inlet hole, and the pipe wall of the steel pipe is fixedly connected with a special-shaped structure. The anchoring plate is provided with a through hole at a central position, the grouting anchor rod passes through the through hole, and the axis of the through hole is coincident with the axis of the grouting anchor rod. The application organically combines grouting reinforcement and the anti-floating anchor rod, utilizes the self weight of the geological structure itself to resist the buoyancy generated by the underground water, reversely realizes the thickening of the waterproof bottom plate by utilizing the grouting reinforcement, provides structural support for the application of the anchor rod prestress, and can be widely applied to the anti-floating and anti-seepage treatment of various underground structures, and can improve the anti-floating capacity of the existing building and reduce the underground water seepage risk.

(DE) The present invention relates to a transport drone with a main body having a wing at its upper part and a transport compartment at its lower part, through which a transport object, for example a car, can be inserted and removed forwards and backwards; and a buoyancy element with several tubes connected to the lower part of the main body and which are inflatable and deflatable by means of air pressure. In this configuration, the tubes, which expand and contract by means of air pressure, are connected along the lower perimeter of the main body. By means of the sequential expansion and contraction of the tubes, the drone can not only land on the water surface by means of the buoyancy force, but also, if it tips over on the water surface, hover above the water surface by means of the sequential expansion and contraction of the tubes, thus preventing it from falling into the water.

Underwater wing device for diving to compensate for the natural buoyancy of the diver and their equipment. The invention relates to a device that generates force in the water using the speed produced by the user. It consists of a wing section extruded over a span adapted to generate sufficient force to compensate for the user's buoyancy, thus avoiding the use of weights, which are cumbersome, potentially dangerous, and polluting. The device according to the invention is particularly intended for freediving or diving with a breathing apparatus, underwater tourism, water sports, and as a swimming aid. Figure 1.

The invention relates to a NMR spectrometer (10) comprising a permanent magnet arrangement (11) which comprises a measurement volume (12) and a bore (13) for introducing a NMR measurement sample in a sample cuvette (14) and a HF coil (15) outside a cylindrical temperature regulation tube (16) which comprises a continuous annular gap (17) through which a temperature regulation gas can be conducted through a gas inlet (18), characterized in that on the end opposite to the gas inlet a movable holding device (19) is mounted which in a first operating position does not touch the sample cuvette, in a second operating position holds the sample cuvette force-locked and / or form-locked on the outer circumference of the sample cuvette with an axially acting force or static friction F f in its measurement position and in a third operating position releases the sample cuvette for removal and in the second operating position applies F f >F Stau -F Gewicht , wherein F Stau denotes the buoyancy force generated by the dynamic pressure of the temperature regulation gas flowing onto the sample cuvette and F Gewicht denotes the gravitational force of the sample cuvette. By this it is possible to avoid the problems of the known generic arrangement by the dynamic pressure of the temperature regulation gas.

This invention relates to the field of underground structure engineering technology, specifically to an active-passive combined anti-buoyancy system and control method for underground structures. The system includes a pressure sensor array, an adjustable one-way pressure relief valve, and a cloud platform controller. The pressure sensor array is used to periodically collect water pressure data at different locations on the foundation of the underground structure and feed it back to the cloud platform controller. The adjustable one-way pressure relief valve is used to perform drainage operations. The cloud platform controller receives the water pressure data from the pressure sensor array, combines the passive anti-buoyancy bearing capacity of the structure with the buoyancy force experienced by the structure at various locations in the current state, performs a combined anti-buoyancy calculation, obtains the resistance effect ratio within the underground structure range, and controls the opening degree of the adjustable one-way pressure relief valve. This invention can regulate the water pressure level of underground engineering in real time, and by analyzing the structural bearing capacity margin in real time, it can ensure the structural anti-buoyancy safety while reducing drainage volume.

The application discloses an anti-floating device for assisting steel-concrete combined hanging box installation, relates to the field of steel-concrete combined hanging box, and solves the problem of slow sinking speed of the steel-concrete combined hanging box, long waiting time for installation of the upper layer steel-concrete combined hanging box and low installation efficiency of the whole steel-concrete combined hanging box due to the large contact area of the bottom of the steel-concrete combined hanging box with water and large floating force during installation of the steel-concrete combined hanging box. The anti-floating device comprises a prefabricated bottom plate, and a steel casing is arranged at the top of the prefabricated bottom plate. The through hole and the gland are arranged. During installation of the steel-concrete combined hanging box, water flow can move through the through hole in the prefabricated bottom plate, the water draining speed of the bottom of the steel-concrete combined hanging box is increased, the upward floating force of water on the bottom of the prefabricated bottom plate is reduced, the sinking speed of the steel-concrete combined hanging box is increased, the installation of the wall plate of the next layer steel-concrete combined hanging box is correspondingly accelerated, and the installation speed of the steel-concrete combined hanging box is improved.

Water tank (10), comprising: a tank housing (12) with a tank interior (13) for receiving water (14), wherein the tank housing (12) has: at least one inlet opening (19) for introducing water (14) into the tank interior (13), at least one outlet opening (17) for draining water (14) from the tank interior (13), and a tank cap (18) on the water tank (10) when installed upper end of the tank housing (12); a float (30) which is freely movable in the interior of the tank (13) of the tank housing (12), wherein the float (30): an elongated buoy housing (301) with a buoy cover (304) at a first end and a buoy base (303) at a second end and has a truncated cone shape, wherein the buoy base (303) is at the narrower end face of the truncated cone shape and the buoy cover (304) is at the wider end face of the truncated cone shape, wherein the buoy cover (304) of the float (30) has a top surface (306) which is convex outwards, in its buoy cover (304) is provided with at least one detection element (32), and is designed such that its weight is less than the buoyant force of the water (14) in the tank interior (13) for it, wherein a length (Lb) of the float (30) is less than a minimum inner diameter (Dt) of the tank shell (12); and at least one sensor (28) arranged in the area of ​​the tank lid (18), wherein the at least one sensor (28) is configured to detect the at least one detection element (32) in the buoy cover (304) of the float (30), and the tank lid (18) has an inner lid profile (20) facing the interior of the tank (13), which is structured to guide the buoy cover (304) of the float (30) towards the at least one sensor (28), and the at least one detection element (32) in the buoy cover (305) of the float (30) has at least one magnetic element; and which has at least one sensor (28) in the area of ​​the fuel filler cap (18) and at least one magnetic sensor.

The invention discloses a method and a system for analyzing a petroleum secondary migration mode. Comprising the following steps: carrying out an indoor physical experiment on to-be-evaluated petroleum to obtain a capillary number index for representing a competitive characteristic between capillary pressure and viscous force and a Bo number index for representing a competitive characteristic between buoyancy and capillary pressure in a secondary migration process of the to-be-evaluated petroleum; according to the ratio of the capillary number index to the Bo number index, determining the main power type of the to-be-evaluated petroleum by using a preset displacement pressure and buoyancy control migration mode identification chart; and determining the fluid secondary migration mode of the to-be-evaluated petroleum according to the main power type. According to the invention, the petroleum secondary migration law under different geological conditions can be analyzed.

The invention discloses a test device and a test method for determining an anti-buoyancy sharing ratio, and belongs to the technical field of underground structure anti-buoyancy tests. The test device comprises an underground structure model cylinder, a soil containing barrel used for containing the underground structure model cylinder, an anti-floating assembly used for providing counter force when the underground structure model cylinder floats upwards, and a load sensor arranged between the anti-floating assembly and the underground structure model cylinder. The water supply mechanism is used for injecting water into the soil containing barrel and providing required test water pressure; the drainage assembly is used for overflow drainage of the soil containing barrel; the water head adjusting assembly is used for adjusting a water head in the soil containing barrel; the pore pressure sensor is used for measuring the water pressure at different positions in the soil containing barrel; and the upper computer is used for calculating the anti-buoyancy sharing ratio according to the measured values of the load sensor and the pore pressure sensor. According to the invention, the corresponding pressure relief water heads are arranged on the underground structure bearing different water pressures to carry out a test, so that the corresponding anti-buoyancy sharing ratio is accurately measured.

The invention belongs to the technical field of rescue equipment, and particularly relates to an inner diameter adjustable flight lifesaving device.A flight life buoy active rescue mechanism comprises a shell, a first cavity and a second cavity are formed in the shell, and the second cavity is located in the first cavity; and an annular notch is formed in the upper end of the inner side wall of the second cavity, a plurality of avoiding clamping grooves are evenly formed in the lower end of the interior of the second cavity, and an adjusting bottom plate is assembled at the lower end of the interior of the second cavity. After a person falling into water wears the device, buoyancy support is provided for the person falling into water through the shell, and the bottom surface of the second capsule film moves under the buoyancy effect and promotes the first capsule film to expand, so that the first capsule film extends out from the interior of the annular notch and is attached to the trunk of the person falling into water; through cooperation of the deformed and expanded first capsule membrane and the shell, surrounding constraining force and distributed balanced buoyancy are provided for people falling into water, so that the device can be suitable for people falling into water with different figures.

The invention relates to the technical field of diving equipment, and particularly discloses a diving suit with a floating control structure, the diving suit comprises a diving suit main body and a gas cylinder, the upper part and the lower part of the diving suit main body are respectively fixed with a first floating structure and a second floating structure through connecting belts; the first floating structure comprises an outer ring air bag assembly and an inner ring air bag assembly which are arranged in a mutually stacked mode. The outer ring air bag assembly comprises a plurality of independent air bags, and the inner ring air bag assembly comprises an annular air bag. The second floating structure comprises a plurality of strip-shaped air bags. The first floating structure and the second floating structure are independently arranged on the chest and the legs, when rapid floating is needed, the first floating structure and the second floating structure can be started at the same time, the maximum buoyancy is obtained, and the control force of a diver on the buoyancy and the posture of the diver is greatly improved. An exhaust valve is arranged on the second floating structure, so that large bubbles which rise quickly and micro bubbles which are dispersed slowly can be generated at the same time, and a very unique visual mark which is easy to recognize is formed on the water surface.

A protection system (1) for the shutdown of a nuclear reactor comprises a first volume (V1) and a second volume (V2), communicating with each other at respective lower ends and containing a process fluid (F) and a pressurised gas; and a gas regulation system (13) to regulate the gas pressure in the volumes (V1, V2); the first volume (V1) comprises a neutron absorber (16) immersed in the process fluid (F) in a lower portion (15) of the first volume (V1) and having a lower density than the process fluid (F), and a constraint element (20) placed above the absorber (16) and pushed downwards by the lowering of the level of the process fluid (F) due to the pressure of the gas contained in the first volume (V1) to keep the absorber (16) in the lower portion (15) against the buoyancy thrust exerted by the process fluid (F); the constraint element (20) is vertically sliding in the first volume (V1) as the gas pressure in the first volume (V1) varies so as to vary the vertical position of the absorber (16) to bring the absorber (16) to face in use to an active portion (A) of the core (C) of the reactor (R).

According to the separation device, suspension liquid is placed in a separation box, the liquid level of the suspension liquid is higher than a first separation part and lower than a second separation part, a coal and gangue mixture is input from the top of the separation box, coal with the density lower than that of the suspension liquid floats upwards, and gangue with the density higher than that of the suspension liquid sinks. Coal is collected through the first separation part, and gangue falls into the second separation part through the penetrating opening to be collected. At the moment, the density of the suspension in the separation box is changed, the buoyancy detection assembly monitors the buoyancy state of the suspension in real time, when the buoyancy of the suspension becomes smaller due to loss of the first suspension medium, the buoyancy detection assembly sinks, and the density adjusting assembly inputs the first suspension medium into the separation box; and the buoyancy detection assembly floats upwards, and the density adjusting assembly inputs a second suspension medium into the separation box. The suspension medium is compensated in the coal and gangue separation process, so that the suspension density is stabilized in a set range, and the accuracy of the separation process is improved.

The aim of the invention is to provide a floatable wave energy converter (100) which has a high degree of efficiency and can also be simply and cost-effectively produced and installed. This is achieved by providing a floatable wave energy converter (100) for converting energy from a wave movement of a fluid into electric energy, comprising a rotor unit (10) having a rotor shaft (11) and rotor support surfaces (12) for generating a buoyancy force (71) which is induced by the wave movement and rotates the rotor unit (10), a generator (20) for generating electric energy, the generator (20) being coupled to the rotor shaft (11) of the rotor unit (10) in order to transmit a torque, and a receiving structure (30) for receiving the rotor unit (10) and the generator (20), the wave energy converter (100) having a control element (40), which comprises at least one movable guiding surface (41), for controlling the movement of the wave energy converter (100) in the sea.

The application discloses a kind of floating pontoon type suspended tunnel test devices considering variable angle of attack of ship impact, immersion depth, including segmental modular design tunnel pipe body, end posture adjusting device, pontoon, column, ship impact simulation system and measuring system.End posture adjusting device can adjust the angle of attack of tunnel pipe body and immersion depth;Pontoon is connected tunnel pipe body by column and provides floating force, and the middle section of column is provided with weak connection component, and it is automatically disconnected when impact load exceeds threshold value;The impact device of ship impact simulation system can adjust impact energy, position and angle;Measuring system is through multiple sensors to collect column and tunnel pipe body stress, tunnel pipe body acceleration and pontoon displacement data.The device can simulate dynamic response and failure process under multiple working conditions, and provide reliable test data support for design optimization of floating pontoon type suspended tunnel.

The invention discloses a self-righting sinking and floating intelligent net cage based on intelligent fishery, and belongs to the technical field of fishery breeding, the self-righting sinking and floating intelligent net cage comprises a center pile, the top of the center pile is provided with a control center, the center pile is sequentially connected with an upper supporting ring, a center ring and a lower supporting ring from top to bottom through connecting rods, and the top of the upper supporting ring is provided with an upper floating block; comprising a buoyancy ring movably sleeved on the side wall of the central ring. Swing of the net cage can be amplified and detected through the sectional area difference of a first hydraulic cavity, a piston push block and a liquid suction hole, meanwhile, the inclined acting force of the net cage is compressed and stored through a sealing piston, when the center ring periodically swings, when the center ring swings to the low point each time, pressure water flow released in a force storage cavity reversely sprays liquid for buffering through a second guide pipe, and the net cage is prevented from falling off. Inclination and swing are buffered and absorbed, the swing amplitude and strength of the box body are reduced, the stability of the breeding environment is improved, and the economic benefits of overall marine product breeding are improved.

According to the net fishing boat body structure with the composite boat body structure, the middle inner keel is arranged in the middle of the boat body, and the rib plates are connected with the main force bearing frameworks in the supporting parts on the two sides of the boat body, so that the longitudinal bending strength of the boat body can be effectively improved when the fishing boat executes anchoring and weighing operations; therefore, longitudinal structure deformation and transverse position deformation of the ship body are obviously inhibited; the net stretching suspender can rotate flexibly, so that the net stretching operation efficiency is improved; the fishing boat body structure not only has good buoyancy and stability, ensures operation safety under complex sea conditions, but also has excellent durability and strength, meets the requirement for long-term high-strength operation, and provides an economical, efficient and safe new solution for fishery production.

The invention discloses a layer type floating breakwater with adjustable draft and anti-typhoon functions, which comprises an upper buoyancy tank, a middle adjusting tank and a lower ballast tank, and is characterized in that the ballast tanks capable of being filled and discharged with seawater are arranged in an upper floating body and a lower floating body, and a water inlet valve, a water discharge valve, a sensor and an intelligent control system are arranged. By controlling the weight of seawater in the ballast tank, three core function modes are realized: in a transportation laying mode, the ballast tank is empty, the dead weight of the structure is greatly reduced, and the construction cost and the marine towing cost are remarkably reduced; in a normal wave dissipation mode, the immersion depth can be flexibly adjusted to adapt to different wave conditions, and the wave dissipation performance is optimized; in an anti-typhoon mode, seawater is injected into all the ballast tanks, so that the total weight of the breakwater is larger than the buoyancy of the breakwater, the breakwater controllably sinks and stably sits on the seabed, impact of typhoons and huge waves is fundamentally avoided, and water is drained, floated and reset after the typhoons. According to the invention, economy, high efficiency and active risk avoiding safety are integrated.

The utility model discloses a sealant sealing property testing arrangement relates to the sealing property test field, including detection box still includes the seal cover of setting in the detection box top opening position, the top of seal cover is connected through the air pump that has of hose connection, the top of seal cover is connected with the detector that detects the air pressure in detection box, still include setting on the transmission mechanism for the material of being used to press down on seal cover. The utility model discloses through setting transmission mechanism, can need to be placed in detection box to the material that has been coated with sealant, if material deadweight is greater than buoyancy, can directly cover seal cover, if deadweight is less than buoyancy, can give the rotary force of rotary lever, make two pressure rods contact with material each other when seal cover covers, and the material is pressed into liquid surface below with the contact of pressure rod and the material that floats on the water surface, through the data of observation bubble and detector, draw the change of air pressure in detection box, to this completes the sealing property test of sealant.

The invention discloses a protection carrier and object separation attitude control method suitable for a high sea condition environment, and relates to the field of marine equipment control, and the protection carrier comprises a pressure-resistant body, buoyancy fins, an attitude control device and an ejection device; the pressure-resistant body comprises a pressure-resistant pipe body, one end of the pipe body is provided with a hood, and the other end of the pipe body is provided with a tail cabin used for installing a posture control device; the four buoyancy fins are symmetrically distributed on the periphery of the pressure-resistant pipe body; the method comprises the steps that when the carrier is protected to float to the water surface, movable parts of four buoyancy fins are unfolded from a folded state to a horizontal state under the action of buoyancy, and the carrier is kept in a vertical state under the high sea condition; the attitude control device adjusts the azimuth angle of the carrier based on the detected wind direction and the three-axis attitude angle of the carrier, so that the carrier is aligned with the wind direction, the ejection device is started at the moment, and control over the carrier and carrier separation attitude is achieved. According to the method, the wave adaptability of the carrier is improved, and the problem of water surface attitude regulation and control is solved, so that the application range of the carrier in the marine environment is expanded.

The invention relates to a demonstration device for demonstrating interaction of force, and belongs to physics science popularization education instruments. A demonstration device for demonstrating interaction of force is characterized in that the demonstration device for demonstrating interaction of force comprises an exhibition stand, a rotating frame, a first reversing device, a second reversing device, a third reversing device and a power switch. An audience turns on a power switch, the servo motor is controlled to drive the rotating frame to rotate by 180 degrees, the three same hourglass bodies (the same in gravity and size) respectively generate three different phenomena of floating, sinking and hovering in three different liquids (different in density and different in buoyancy), and therefore the dynamic relation among buoyancy gravity, buoyancy and friction force is displayed. The device well solves the problem of the dynamic change process of the interaction of presentation force, and makes up for the situation that science and technology exhibition halls are lack of such demonstration devices.

The utility model provides a fish sorting device for a fish lifter, which comprises a sorting pool and a mesh screen assembly, the mesh screen assembly comprises a support frame and a screen which is positioned at the top of the support frame and is obliquely distributed, the support frame is positioned in the sorting pool and is in up-down sliding fit with the sorting pool, and the screen is provided with an opening and closing screen door. An air buoyancy assembly is arranged at the bottom of the supporting frame, and an air supply part used for inflating and deflating the air buoyancy assembly is arranged outside the sorting pool. According to the utility model, the air buoyancy component is arranged at the bottom of the mesh screen component, the mesh screen component is controlled to ascend and descend by utilizing buoyancy, and then the air supply part is arranged outside the separation tank, so that the device is long in service life and low in maintenance cost.

The invention discloses a self-powered underwater glider based on attitude adjustment of a wave power generation device, and belongs to the technical field of underwater unmanned vehicles. The core innovation of the invention lies in that a set of energy conversion module with both power generation and driving functions is integrated in the streamline cabin. When the device floats to the sea surface, the device enters a power generation state, wave excitation force drives a stator and a rotor of a motor to generate relative linear motion, and wave energy in the heaving direction is efficiently captured and converted into electric energy to be stored; when the equipment dives and glides, the equipment is converted into a driving state and serves as a motor to accurately control the axial position of a rotor, so that the gravity center of the whole machine is adjusted, and pitching attitude control and floating and diving movement are achieved in cooperation with the buoyancy adjusting unit. According to the invention, the utilization rate of the space in the cabin is obviously improved, the maintenance cost is reduced, and an efficient and reliable energy self-supply solution is provided for long-time-sequence and large-range ocean observation tasks.

The application discloses a multifunctional offshore rescue buoy and relates to the technical field of rescue buoys.The multifunctional offshore rescue buoy comprises a buoy base, a fixed stand is arranged at the center point of the buoy base, a rescue platform is slidably arranged on the fixed stand, a sliding track is formed in the buoy base, a bottom floating plate is arranged at the bottom outer side of the buoy base, a protective plate is arranged at the upper end outer side of the buoy base, a sliding plate is arranged in the outer side cavity of the protective plate through a fixed block and a spring, and an auxiliary lifting assembly and a storage supporting assembly are arranged in the buoy base.When a drowning person swims to the vicinity of the offshore rescue buoy, the drowning person can hold the intervals arranged between the protective plates with hands to stabilize the position of the drowning person, the body strength for climbing is reduced through the upward movement of the protective plates, the bottom floating plate at the bottom of the buoy base is pushed to be supported open through the downward movement of the rescue platform, and the overall impact resistance and buoyancy of the device are increased.