121 results about "Sea urchin" patented technology

The application discloses a sea urchin-shaped antibacterial piezoelectric copper-zinc oxide and a preparation method and application thereof, and belongs to the field of biological medical materials. The preparation of the copper-zinc oxide comprises the following steps: (1) weighing Cu 2+ and Zn 2+ containing compound raw materials, dissolving the raw materials in deionized water, and preparing a mixed solution after dispersion; (2) adding the mixed solution obtained in the step (1) into deionized water containing DMSO, stirring and uniformly mixing, and preparing a solution containing Cu 2+ and Zn 2+ ; (3) adding an alkali source into the solution obtained in the step (2), heating and reacting, centrifugally collecting a precipitate, and obtaining the copper-zinc oxide after washing. The copper-zinc particles are subjected to thermal hydrolysis under the action of the organic solvent DMSO under an alkaline condition, and the copper-zinc oxide with a sea urchin-shaped structure is generated; and the oxide exhibits excellent piezoelectric antibacterial performance under stirring at room temperature.

The application discloses a biomimetic urchin-shaped asymmetric structure composite phase change chitosan aerogel loaded with TiO2 / rGO heterojunction and a preparation method and application thereof, adopts argon plasma etching GO, step-by-step dropwise adding tetrabutyl titanate to prepare TiO2 / rGO heterojunction; prepares a multi-level structure phase change microcapsule by an interfacial polymerization method; mixes the heterojunction with a chitosan solution, and prepares a biomimetic urchin-shaped asymmetric chitosan aerogel framework through a customized asymmetric mold and a unidirectional freezing process; fixes the phase change microcapsule by a vacuum-assisted impregnation method, and then performs in-situ coating through polydopamine to obtain the biomimetic urchin-shaped asymmetric structure composite phase change chitosan aerogel loaded with TiO2 / rGO heterojunction, the removal rate of VOCs of the biomimetic urchin-shaped asymmetric structure composite phase change chitosan aerogel loaded with TiO2 / rGO heterojunction is greater than or equal to 80% at low temperature, the phase change microcapsule dispersion rate is less than or equal to 3% after 100 cycles, the structural stability and the cycle durability are excellent, and the biomimetic urchin-shaped asymmetric structure composite phase change chitosan aerogel loaded with TiO2 / rGO heterojunction is suitable for efficient purification of VOCs in low-temperature closed scenes such as cold chain workshops and indoor environments in winter.

The present invention provides a seaweed fertilizer material that allows for easy and inexpensive fertilization and supplemental fertilization of seaweed, as well as enabling the strengthening and reuse of cultivation ropes, a seaweed cultivation facility equipped with this material, a method for manufacturing the seaweed fertilizer material, and a method for cultivating seaweed. [Solution] The seaweed fertilizer material 1 according to the present invention is a seaweed fertilizer material 1 for fertilizing seaweed, and contains raw rubber and shell powder obtained by grinding the shells of marine organisms into powder, and is formed in the form of a sheet or string. The shell powder may be powder from sea urchin shells, and may further contain iron fulvic acid.

The invention relates to the technical field of hydrogen production through methane cracking, in particular to a sea urchin-shaped composite catalyst, a preparation method thereof and application of the sea urchin-shaped composite catalyst in hydrogen production through methane cracking. The obtained sea-urchin-shaped composite catalyst has a sea-urchin-shaped appearance, can efficiently catalyze methane cracking to produce hydrogen, simultaneously captures CO2 produced by vapour gasification carbon deposition in a catalyst regeneration process to generate CaCO3, promotes the gasification hydrogen production of the carbon deposition and strengthens the removal effect of the carbon deposition, and the generated CaCO3 can also be converted into CO in situ, so that the catalyst has a good application prospect. The obtained catalyst has good anti-sintering performance and excellent recycling performance.

The invention relates to an intelligent fishing robot and a fishing method for benthic organisms cultured in an ocean cofferdam, and solves the technical problem of how to improve the automatic fishing efficiency for sea cucumber cultured in the ocean cofferdam. The device comprises a catamaran, a left side mechanical arm support, a right side mechanical arm support, a conveying belt support, a conveying belt device, a collecting basket, a plurality of left side mechanical arms and a plurality of right side mechanical arms, the conveying belt device is located between the left side mechanical arms and the right side mechanical arms, and the collecting basket is located below the rear end of the conveying belt device. The method is suitable for benthic organisms such as sea cucumbers, abalones, scallops, mussels and sea urchins which are cultured in an ocean cofferdam mode.

The invention relates to the technical field of nanofiber materials, in particular to a PI / W18O49 / g-C3N4 bifunctional nanofiber material as well as a preparation method and application thereof. The material comprises a PI nanofiber sheet, w18O49 nanometer sea urchin and a g-C3N4 nanometer sheet are loaded on the surface of the PI nanometer fiber sheet through in-situ growth, and the W18O49 nanometer sea urchin and the g-C3N4 nanometer sheet form a heterojunction. The preparation method of the material comprises the following steps: step 1, preparing a PI nanofiber sheet; step 2, preparing the W18O49 nanometer sea urchin; (3) preparing a g-C3N4 nanosheet; and step 4, preparation of the PI / W18O49 / g-C3N4 nano fiber sheet. The problems that in an existing photocatalyst, the recombination probability of photo-induced electron-hole pairs is high, precious metal needs to be introduced into an existing SERS substrate, and the recycling difficulty of the photo-induced electron-hole pairs and the existing SERS substrate is large after the photo-induced electron-hole pairs and the existing SERS substrate are used are effectively solved, and the method is suitable for photocatalytic degradation and SERS detection of tetracycline.

This invention provides an iron-carbon based catalyst, its preparation method, and its application, relating to the field of wastewater treatment technology. The preparation method includes: S1, adding bamboo powder and humic acid to an alkaline solution and stirring to obtain a carbon precursor; S2, adding the carbon precursor to a glucose solution and carrying out a hydrothermal reaction to obtain a carbon complex; S3, adding an active iron source and an auxiliary agent to a humic acid solution to obtain a complex solution; S4, adding the carbon complex to the complex solution and performing gradient calcination under an inert atmosphere to obtain the iron-carbon based catalyst. The entire preparation process of this invention requires no external binder or pore-forming agent, reduces sintering temperature, and has low cost. The prepared sea urchin-type iron-carbon based catalyst exhibits extremely strong iron-carbon bonding, is not easily detached, and has high stability. Its structure provides a large number of active sites, and the radial nanospikes maximize the specific surface area, greatly promoting Fe... 3+ / Fe 2+ It can recycle and increase the yield of •OH, has strong catalytic activity, and can efficiently degrade recalcitrant organic pollutants.

The invention discloses a rapid fattening bait for sea urchins and a preparation method thereof, and belongs to the technical field of aquaculture feeds. The bait is prepared from the following raw materials in parts by weight: 10-25 parts of kelp powder, 10-25 parts of undaria pinnatifida powder, 5-15 parts of ulva pertusa powder, 5-15 parts of mussel powder, 8-20 parts of corn flour, 1.5-4.5 parts of gelatin powder and 30-50 parts of purified water. The sea urchin fattening feed has the beneficial effects that the formula is scientific, the nutrition is comprehensive and balanced, and the sea urchin fattening feed specially aims at the sea urchin fattening nutritional requirements and can remarkably promote rapid development of sea urchin gonads; after the bait enters water, the structure can be kept complete for a long time, the bait is almost free of dissolution loss, the utilization rate of the bait is greatly improved, and water pollution is fundamentally avoided; the bait is soft in texture and easy to gnaw by sea urchins, and the surface of the bait can slowly release food calling substances to attract the sea urchins to gather and eat; in the preparation process, low-temperature mixing and gel shaping are adopted, so that nutrient substances such as heat-sensitive vitamins and unsaturated fatty acids are effectively protected.

The invention discloses an application of a sea urchin-shaped spinel electrode material in a solid oxide fuel cell (SOFC), and the SOFC oxygen electrode material is sea urchin-shaped NiCo2O4 spinel and is prepared by a hydrothermal method. The sea-urchin-shaped spinel is self-assembled to the surface of the YSZ electrolyte through a current polarization induction method, the sea-urchin-shaped spinel electrode can maintain a good nano structure and a high specific surface area without a high-temperature sintering process, an SOFC based on the sea-urchin-shaped spinel oxygen electrode obtains excellent electrochemical performance, and at the working temperature of 700 DEG C, the electrochemical performance of the SOFC is greatly improved. The maximum output power can reach 2.06 W / cm < 2 >, the ohmic impedance is 0.053 ohm cm < 2 >, the polarization impedance is 0.077 ohm cm < 2 >, and excellent long-term stability is shown.

The invention provides a modular aquatic higher plant ecological treatment method and system for sea urchin / sea cucumber culture tail water, and belongs to the technical field of culture tail water treatment. The gradient process of tail water introduction, first-stage rough filtration, second-stage ecological purification and third-stage deep purification is adopted, and the treated tail water is shunted and reused in a culture pond or discharged after reaching the standard. No chemical agent is added, residue bait recycling and tail water circulation are achieved, purification is stable and efficient, cost is reduced, operation and maintenance are easy, the method is suitable for large-scale aquaculture, treated tail water can be directly recycled after being disinfected, seawater resources are greatly saved, a complete aquaculture water circulation closed loop is formed, the ecological property, practicability and economical efficiency are achieved, and the method is suitable for large-scale aquaculture. The method is suitable for tail water treatment and resource utilization of various sea urchin / sea cucumber culture modes.

An aquaculture device designed to hold and secure marine species such as scallops, urchins, or oysters in an underwater environment while they grow, the device configured to be deployed and retrieved in a manner similar to conventional commercial fishing gear.

This invention relates to the field of sea urchin aquaculture technology, and provides a method and system for sea urchin instance segmentation and high-throughput measurement of growth traits. The method includes: acquiring calibrated images containing sea urchins; extracting sea urchin pixel boundaries using a pre-trained SUYOLO-seg model; calculating the sea urchin pixel area using a polygon area formula, and calculating the true physical area of ​​the sea urchin based on the pre-calibrated true physical area of ​​each unit pixel; and estimating the true weight of the sea urchin using a sea urchin weight trait prediction model based on the mapping relationship between sea urchin area and weight. This achieves completely non-contact measurement of growth traits, avoiding the strong stress response caused by removal from water, ensuring normal growth and development, and completely solving the weighing error problem caused by water retention on the sea urchin surface and between its spines.

The invention belongs to the technical field of battery materials, and provides a sea urchin-shaped Mn2O3 positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing manganese acetate, polyvinylpyrrolidone and ethanol to obtain a mixed solution; mixing trimesic acid and ethanol to obtain a trimesic acid solution; mixing the mixed solution and a trimesic acid solution, heating and stirring to obtain a precursor; and calcining the precursor. The Mn2O3 positive electrode material provided by the invention has a sea urchin-shaped morphology, provides more reaction active sites, has a relatively high specific surface area, increases the contact area with an electrolyte, accelerates electrochemical reaction, and improves the electrochemical activity and structural stability of an aqueous battery; the sea urchin-shaped morphology is beneficial to relieving volume expansion caused by the positive electrode material in the charging and discharging process, and the cycling stability is improved; the preparation method is simple, raw materials are easy to obtain and low in cost, the method is simple, and the prepared sea urchin-shaped Mn2O3 positive electrode material is good in controllability and suitable for large-scale production.

This invention provides a CNT / W 18 O 49 Cu nanofiber sea urchin material and its SERS-photocatalytic bifunctional application, wherein the material is internally embedded with carboxylated CNTs, and W 18 O 49 The nanostructures intertwine to form a three-dimensional network, and the surface of the nano-sea urchin material is composed of high-density radial nanoneedles with Cu at the tips. 2+ Anchored in an atomically dispersed form. This is achieved through carboxylation of CNTs with W... 18 O 49 Nanoneedles intertwine to form a three-dimensional network, creating a radial nanoneedle structure on the surface, with atomically dispersed Cu atoms anchored at the needle tips. 2+ It combines high-sensitivity SERS detection with efficient photocatalytic degradation, enabling integrated "detection-degradation" treatment of organic pollutants.

The utility model discloses a three-dimensional layered net rack for sea urchin fry culture, which belongs to the technical field of culture and comprises a square rack body, and a plurality of net cages for sea urchin fry culture are detachably connected to the inner wall of the rack body in a three-dimensional layered manner; the balance weight plate is arranged below the frame body, the top end of the balance weight plate is fixedly connected with two auxiliary plates, the two auxiliary plates are rotationally connected with the frame body through rotating shafts, a waterproof shell is installed on the side face of one auxiliary plate, and a forward and reverse motor for providing power for one rotating shaft is installed on the inner wall of the waterproof shell; a plurality of air bags used for providing buoyancy are installed at the top end of the frame body, air supply equipment used for providing air for the air bags is installed at the top end of the frame body, a balancing weight is connected to the side, away from the air bags, of the frame body, the air bags are further communicated with a deflation pipe with an electromagnetic valve, and openings are formed in the side faces of the net cages. According to the three-dimensional layered net rack for sea urchin seedling culture, excrement can be well treated, and the culture space can be adjusted.

The application discloses a kind of instant sea urchin processing method and equipment, and the application relates to the technical field of aquatic product processing, including connecting pipe, the quantity of connecting pipe is two, two The connecting pipe is fixedly connected with feed pipe and discharge pipe respectively, the outside of connecting pipe is rotatably connected with gear, the outside of gear is fixedly connected with air cylinder, the elongated end of air cylinder is fixedly connected with fixed ring, the end close to air cylinder of fixed ring is rotatably connected with connecting plate, the end away from fixed ring of connecting plate is rotatably connected with connecting ring, the outside of connecting ring is fixedly connected with fixed rod, this instant sea urchin processing method and equipment, by multiple connecting ring and fixed rod form a dip net, motor drives worm to rotate, so that gear rotates, and then gear drives dip net to rotate, at this moment sea urchin in dip net and between sea urchin, sea urchin and dip net due to rotation and mutual friction effect, realize the function of removing sea urchin spines.

This invention discloses a sea urchin-shaped oxygen-rich vacancy O vac This paper describes a CuO@ZIF-8 core-shell structured photothermal catalyst, its preparation method, and its application, belonging to the fields of photocatalytic materials and artificial nitrogen fixation technology. The technical solution is as follows: the catalyst has a core-shell structure, with the core being urchin-shaped copper oxide (CuO) microspheres. These microspheres are assembled from radially arranged one-dimensional nanoneedles or nanospikes, and the surface of the core contains oxygen vacancies (O). vac The shell is an in-situ grown ultrathin zeolite imidazole ester framework material, ZIF-8, which possesses hydrophobic and molecular diffusion channel properties. This invention also constructs a matching biomimetic three-phase interface photothermal reaction system. Through the synergy of a hydrophilic substrate supplying water and a hydrophobic, permeable shell, it achieves a balance between gas diffusion and proton supply, reducing the submersion of active sites by liquid water and the occurrence of side reactions. This invention has significant advantages such as high photothermal conversion efficiency, mild preparation conditions, and high gas-liquid interface mass transfer efficiency.

The present application belongs to the technical field of marine ecological breeding, and particularly relates to a compound marine ranching device and method based on urchin-alga-stichopus nutrient internal circulation. The compound marine ranching device based on urchin-alga-stichopus nutrient internal circulation comprises an urchin breeding area, a stichopus breeding area, a reef-throwing bottom sowing area, an environment monitoring and control system and a main body connecting frame. The urchin breeding area and the stichopus breeding area are both provided with multiple net cages, and the urchin net cages and the stichopus net cages are staggered. The reef-throwing bottom sowing area is located at the lower part of the breeding area. The environment monitoring and control system comprises a sensor group, a remote monitoring host and a control execution unit. The compound marine ranching device and method based on urchin-alga-stichopus nutrient internal circulation can absorb nitrogen and phosphorus generated in breeding by means of algae, and improve the bottom material by stichopus disturbance, thereby relieving the problems of eutrophication and bottom layer anoxia from the source, and greatly improving the breeding yield and economic benefits per unit sea area.

The application discloses a surface coating and a preparation method and application thereof, and belongs to the field of surface coating technology. The surface coating comprises a polyaniline particle surface layer and an organic silicon resin base layer. The preparation method comprises the following steps: applying a polyaniline particle dispersion liquid to a pre-solidified organic silicon resin surface, and drying to obtain the surface coating. In the application, the mechanical anchoring effect of the functionalized organic silicon resin and the sea urchin-like polyaniline particles is utilized, so that the composite coating can still maintain the adhesion to the base material and the micro-nano structure of the coating under the action of external force, high durability is realized, and the application prospect in the fields of base material self-cleaning and anti-icing is good.

The invention provides a method and device for evaluating the health state of sea urchins based on calthrop interaction response characteristics, and relates to the technical field of data processing.The method comprises the steps that 1, a detection platform is constructed, the platform comprises a flexible recoverable detection material and a plurality of calthrop contact sensing units, the data acquisition module is used for acquiring original interaction response data of echinocalthrops of sea urchins at different times, and the original interaction response data comprises time sequence pressure distribution, time sequence deformation distribution, contact point space coordinates and a contact force change rate; 2, performing preprocessing and feature extraction on the original interaction response data, and calculating to obtain unit area pressure, calthrop insertion depth, springback speed, calthrop stability retention time, total contact area and unit time pressure change rate feature parameters; according to the method, a professional detection platform is constructed to collect and process sea urchin thorn interaction response data, and clustering analysis, algorithm optimization and a classification model are combined, so that the sea urchin health level can be accurately evaluated.

This invention relates to a method for natural sea urchin seed collection in marine areas. The method selects areas with abundant sea urchin resources as seed collection points based on statistical data collected throughout the year. Then, using the nearshore seed collection point as the center and the line connecting it to two other seed collection points on its outer perimeter as the radius, seed collection platforms are erected parallel to each other within a "fan-shaped" radius to construct a "fan-shaped" seed collection area. The development of mature sea urchin gonads and the number of planktonic larvae at the seed collection points are monitored regularly to accurately determine the seed collection time. Finally, a new type of seed collection net cage is deployed as the seed collection device according to the planned seed collection volume for seed collection. Compared with traditional net bag natural seed collection, this invention increases efficiency by 20-30%, reduces labor demand by 30%, facilitates mechanized operation, meets the requirements of large-scale natural seed collection industry development, and provides support for subsequent industrial restructuring and sustainable development, thus having significant implications for the sustainable development of the marine industry.

1. Name of the designed product: bionic fish bait (sea urchin). 2. Use of the designed product: fish bait for fly fishing. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

The utility model relates to the technical field of sea urchin cultivation, and discloses a sea urchin seedling cultivation device which comprises a cultivation mechanism, a storage mechanism is arranged in the cultivation mechanism, the cultivation mechanism comprises a water changing device, an oxygen supplementing device is arranged at the top end of the inner side face of the water changing device, and the top face of the water changing device is fixedly connected with a shell. The side face of the shell is fixedly connected with a support, and the top end of the inner side face of the support is movably connected with a light supplementing lamp. A water source is provided for the whole device through the water inlet pump, water in the device is pumped through the water suction pump, the water changing requirement of sea urchin culture is met, sundries in a water body can be gathered through the funnel when the water suction pump pumps water, dirt and water are pumped away through the water suction pump, the base and the shell can be divided into two spaces through the oxygen supplementation device, and the space is saved. The width of the oxygenating device is smaller than that of the opening of the base, so that dirt cleaned into the base through the oxygenating device is not easy to return to the interior of the shell again.

The invention provides a novel urchin-shaped ordered carbon-iron composite material as well as a preparation method and application thereof, and belongs to the technical field of carbon nanomaterials. The preparation method comprises the following steps: by taking triethanolamine, cetyltrimethylammonium bromide, sodium salicylate and tetraethyl silicate as raw materials, mixing and stirring, carrying out hydrothermal reaction, washing and centrifuging, drying and calcining in an air atmosphere to obtain an urchin-shaped silicon template; then compounding the silicon template and dopamine in a Tris solution, and carrying out stirring ultrasonic treatment, standing in a dark place and centrifugal drying to obtain mesoporous silicon filled with polydopamine; and mixing the product with ferrocene in acetone, adding a hydrogen peroxide solution, carrying out oil bath stirring until the solvent is volatilized, drying, calcining in an inert atmosphere, and finally, carrying out alkaline solution reflux and centrifugal drying treatment to obtain the novel urchin-shaped ordered carbon-iron composite material. The obtained novel urchin-shaped ordered carbon-iron composite material has excellent catalytic activity, and has a good application prospect in the fields of electro-catalysis, engineering materials, energy storage and conversion and the like.

The invention discloses feed crushing equipment for sea urchin culture, which comprises a bearing mechanism, a crushing mechanism, a filtering mechanism, an anti-blocking mechanism and a driving mechanism, and is characterized in that the bearing mechanism comprises a crushing box and a separation box which is located at the bottom of the crushing box and communicates with the crushing box; when the crushing mechanism works, the feed in the crushing box is repeatedly cut; the filtering mechanism comprises a detachable and washable particle filtering plate mounted at the bottom of the crushing box and a powder particle filtering plate positioned in the separating box; when the anti-blocking mechanism works, the particle filter plate and the powder particle filter plate are prevented from being blocked; and the driving mechanism comprises a driving motor, a first transmission assembly for automatically driving the crushing mechanism to work when the driving motor works, and a second transmission assembly for automatically driving the anti-blocking mechanism to work when the crushing mechanism works, so that the problem that when the feed is crushed, the crushed feed is mixed in feed particles, and the feed particles cannot be blocked when the sea urchins are fed is solved. The powdery feed is not beneficial to the eating of the sea urchins after being quickly dissolved in water, and the water quality is influenced.

The present invention relates to the field of aquaculture technology and discloses a sea cucumber aquaculture device having a waste discharge function, comprising the following: a net box; a waste discharge sleeve net, comprising a sleeve head and a sleeve bottom, wherein one end of the sleeve bottom is connected to the center of the netting bottom of the net box, the other end of the sleeve bottom is connected to the sleeve head, and one end of the sleeve bottom separated from the sleeve head is sealed; a support mechanism, installed inside the netting of the net box and installed at the bottom of the netting, and a through structure is installed thereon to allow the waste discharge sleeve net to pass through; a lifting mechanism, installed in the net box and connected to the inner side of the sleeve head, wherein in a first state, the waste discharge sleeve net passes through the through structure and is placed upside down inside the net box, and in a second state, the waste discharge sleeve net is placed outside the net box; and a first weight connected to the outer side of the sleeve head. In the first state, the device can conveniently discharge waste from the netting. The device is suitable not only for large-scale seedling and adult sea cucumber aquaculture but also for abalone and sea urchin aquaculture.

The application discloses a method for distinguishing female and male of intermediate sea urchin, and belongs to the field of sea treasure seed production. According to the color and brightness difference of the peristome of the intermediate sea urchin, the standard color value and threshold value of the female and male sea urchin are determined, and the female and male of the intermediate sea urchin is determined. The distinguishing method can determine the female and male of the intermediate sea urchin in vivo, and the determination method is more economical, convenient, efficient and practical, so that the distinguishing method has important application value for sea urchin breeding industry.

This invention discloses an ecological synergy-based sea urchin-kelp ecological aquaculture device and method, belonging to the field of marine ecological aquaculture. It includes: a main frame, a kelp cultivation area, a sea urchin cultivation area, a material exchange unit, and an environmental monitoring unit. The main frame is divided into an upper kelp cultivation area and a lower sea urchin cultivation area by a horizontal partition. Several rows of seedling ropes are installed at the top of the kelp cultivation area for suspending the cultivated kelp. A porous concrete fish reef is installed at the bottom of the kelp cultivation area. A pebble layer is laid at the bottom of the sea urchin cultivation area for cultivating sea urchins. The material exchange unit includes several connecting channels opened in the middle of the horizontal partition. The environmental monitoring unit includes an integrated sensor group and a data transmission module. This invention can achieve ecological synergy between sea urchins and kelp through "isolation and protection - controlled feeding - nutrient cycling".

1. Name of the product in this design: Doll (Anthropomorphic Sea Urchin Baby). 2. Intended use of this design: for toys. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The utility model discloses sea urchin marking equipment which comprises a bottom plate, the top end of the bottom plate is fixedly connected with symmetrically-arranged supporting plates, symmetrically-arranged guide grooves are formed in the two supporting plates, transmission grooves are formed in the positions, close to the middles of the guide grooves, of the two supporting plates, and extrusion shafts are arranged in the multiple guide grooves. Expansion rods are fixedly connected to one sides of the top ends of the multiple extrusion shafts, rectangular blocks are fixedly connected to the ends, away from the expansion rods, of the multiple extrusion shafts, and a placement plate is jointly and fixedly connected to the positions, close to the top ends, of the two supporting plates; the sea urchin marking device has the advantages that the expansion rod with the specified motion trail drives the marking belt to expand and contract, then the marking belt is arranged on the surface of the sea urchin at the preset position in a sleeved mode, the two hands of a marking person do not need to make direct contact with the sea urchin, the situation that the marking person is punctured by the sea urchin is avoided, marking operation is standardized, and the marking efficiency is improved. And the risk of sleeving the marking belt on the sea urchin is further reduced.