55results about How to "Process safety" patented technology

The invention relates to the technical field of industrial automation and intelligent detection, and discloses a multi-mode industrial line inspection robot and system.The robot comprises a crawler saddle, a machine body is installed at the top of the crawler saddle, and mechanical arms are arranged at the driving ends of the two sides of the machine body and used for controlling a detection assembly to make contact with the outer wall of a rail and the outer wall of a pipeline; a cleaning assembly is arranged on the front side of the detection assembly, the cleaning assembly is used for removing dirt on the outer wall of a to-be-detected part before detection, and the system comprises a main control and navigation module used for robot path monitoring, environment perception and dynamic obstacle avoidance and achieving autonomous navigation and path adjustment in a complex environment in combination with GPS and IMU data. Through ground and high-altitude division cooperation and multi-modal detection, all-directional inspection in a complex scene is realized, the applicability, the detection precision and the inspection efficiency are improved, the problem of insufficient applicability of a single scene in the prior art is solved, and an efficient scheme is provided for intelligent maintenance of industrial lines.

The invention discloses a preparation method and application of a bimetallic phosphate oxygen evolution electrode. The preparation method of the bimetallic phosphate oxygen evolution electrode comprises the following steps: cleaning a nickel substrate in an alkaline solution to remove oil, and cleaning the nickel substrate with pure water; soaking the cleaned nickel substrate in an acid solution, cleaning the nickel substrate with pure water, and placing the nickel substrate in the pure water for later use; the nickel substrate placed in the pure water serves as a cathode, two pure nickel materials are placed on the two sides of the nickel substrate to serve as two anodes, and electro-deposition is conducted on the nickel substrate in a bimetallic phosphate solution; and washing an electrode obtained after electrodeposition of the nickel substrate, and drying to obtain the bimetallic phosphate electrode. According to the preparation method, the adsorption free energy of a catalytic layer on the surface of the bimetallic phosphate oxygen evolution electrode on a reaction intermediate is optimized through the synergistic electronic effect of two metals, so that the intrinsic activity of oxygen evolution reaction is improved, meanwhile, a relatively stable catalytic layer structure is formed, and the stability of the bimetallic phosphate oxygen evolution electrode in the oxygen evolution process is improved.

The invention provides a ferronickel-based oxygen evolution electrode and a preparation method thereof based on interface confinement. The preparation method of the ferronickel-based oxygen evolution electrode comprises the following steps: preparing a precursor solution containing ferrous ions and ferric ions; the foamed nickel substrate is cleaned; the cleaned foamed nickel is tightly attached to the surface of the bottom of the reaction container, the foamed nickel is immersed in the precursor solution, under the room-temperature standing condition, divalent and trivalent iron ions are induced to be subjected to a synergistic hydrolysis and coprecipitation reaction through a physical interface confinement space formed by an attached interface, and the nickel-based composite material is obtained. Therefore, a high-activity and high-uniformity nickel-iron-based (oxygen) hydroxide catalyst layer (DIC-NiFeOOH / NF) is grown on the surface of the foamed nickel in situ. The method is simple in process, green and energy-saving, and the prepared nickel-iron-based oxygen evolution electrode shows excellent performance in oxygen evolution reaction and anion exchange membrane water electrolysis.

The invention provides a plasma-based modification method for aging resistance and flashover resistance of the surface of an insulating material, and relates to the technical field of surface modification of insulating materials, and the plasma-based modification method specifically comprises the following modification steps: step 1, grinding 40-60 parts of the insulating material and then sieving; step 2, pouring into 40-60 parts of deionized water, and mixing; and 3, pouring 22-25 parts of absolute ethyl alcohol, heating, carrying out ultrasonic dispersion for 10-15 minutes, and stirring. According to the method for modifying the aging resistance and flashover resistance of the surface of the insulating material based on the plasma, the coupling agent cooperates with the plasma to perform composite modification treatment on the surface of the insulating material, so that the grafting rate of the surface of the insulating material and the coupling agent is increased, the surface of the insulating material is etched, the roughness is improved, and the surface energy is increased; further through plasma modification treatment, the direct-current vacuum surface flashover voltage of the insulating material is remarkably improved, and the method is simple in process, safe in process and environmentally friendly and can be widely applied to the field of high-voltage insulating materials.

The invention discloses a lactobacillus delbrueckii subsp. Bulgaricus CCFM1520 for transforming curcumin to produce tetrahydrocurcumin to relieve nervous anxiety, and belongs to the technical field of microorganisms. The lactobacillus delbrueckii subsp. Bulgaricus CCFM1520 screened by the invention has the capability of converting curcumin, and can utilize curcumin and generate tetrahydrocurcumin. The invention further provides a synbiotic preparation prepared from the lactobacillus gasseri CCFM1481 and curcumin, the synbiotic preparation can be used as an anti-fatigue functional medicine, the individual behavioral memory level can be improved, the imbalance of body neurotransmitters (DA, 5-HT and NE) can be slowed down, the expression of body neuroprotection related genes (BDNF, TrkB, DRD1 and TH) can be improved, and the synbiotic preparation has a huge application prospect.

This invention belongs to the field of cosmetic technology, specifically relating to a method for preparing a lemon fruit extract containing sennaol and its application in soothing. This invention provides a method for preparing a lemon fruit extract containing sennaol, utilizing the strong penetration and dissolving power of a green solvent and the high selectivity of enzymatic reactions to achieve not only efficient extraction and conversion of sennaol but also naturally endowing the final product with excellent water solubility and chemical stability. The prepared lemon fruit extract can be directly applied to water-based formulations without complex modification or the addition of large amounts of co-solvents, maintaining potent skin-soothing activity. The entire process is gentle and safe, with no irritating organic solvents or strong acid residues, making it particularly suitable for cosmetic development targeting sensitive skin.

The utility model belongs to the technical field of regeneration of useful parts of waste storage batteries, and particularly relates to a cylindrical lithium battery discharging device which comprises a discharging platform, a sliding groove is formed in the platform in the length direction, and a sliding seat is arranged in the sliding groove in a sliding fit mode. A stepped hole for bearing a battery is vertically formed in the sliding seat in a penetrating manner; the platform comprises two side plates and a top plate, and the sliding groove penetrates through the top plate; a hollow discharge bin is arranged on the top plate in a protruding mode, the two ends of the sliding groove extend out of the discharge bin, and channel openings are formed in the side walls of the two ends of the discharge bin. An upper discharging guide rod capable of vertically stretching and retracting is arranged in the discharging bin, a lower discharging guide rod capable of vertically stretching and retracting is arranged below the top plate, the lower discharging guide rod is located under the upper discharging guide rod, and the free ends of the upper discharging guide rod and the lower discharging guide rod are opposite; and the upper and lower discharge guide rods are electrically connected with a discharge instrument respectively. The device is suitable for being applied to an automatic production line under the working condition of a vertical manipulator, residual electricity of the battery is released in the discharging bin, use is reliable, and the process is convenient and safe.

A gas processing system according to one aspect includes: a multiple-shell tank including an inner shell storing a cryogenic liquid therein, one or more outer shells accommodating the inner shell, a combustible gas being filled in an insulating space between the inner shell and the one or more outer shells or an insulating space between two adjacent outer shells among the outer shells; a combustor located outside the one or more outer shells; a discharge passage that discharges the combustible gas from the insulating space and guides the combustible gas to the combustor; and a discharge valve located at the discharge passage.

The invention belongs to the technical field of eutectic gels, and particularly discloses a severe environment-resistant eutectic gel as well as a preparation method and application thereof. The preparation method comprises the following steps: etching Ti3AlC2 with hydrofluoric acid to prepare MXene, and modifying MXene with a tetrabutylammonium hydroxide intercalation to obtain a tetrabutylammonium hydroxide intercalated MXene nanosheet; the preparation method comprises the following steps: by taking tetrabutylammonium chloride and thymol as raw materials, mixing, heating and stirring to obtain a deep eutectic solvent, sequentially adding isobornyl methacrylate, acrylic acid-2-phenoxyethyl ester, ethylene glycol dimethacrylate, diphenyl (2, 4, 6-trimethylbenzoyl) phosphine oxide and tetrabutylammonium intercalated MXene nanosheets into the deep eutectic solvent, stirring in a dark place, and carrying out vacuum drying, so as to obtain a finished product. And performing photo-crosslinking curing under ultraviolet irradiation to obtain the eutectic gel. The eutecticevaporate gel prepared by the invention not only has good mechanical properties, but also has good toughness, self-adhesion, freezing resistance, high temperature resistance, moisture resistance, drying resistance and excellent strain sensitivity, and overcomes the defect that the traditional hydrogel and hydrophilic eutecticevaporate gel are not moisture-resistant; the method has wide application prospects in the fields of flexible strain sensors, intelligent wearable devices, bionic electronic skins, medical health monitoring or intelligent soft robots and the like.

The utility model provides a device for automatically measuring the proportion of sulfuric acid, which comprises an acid tank, a cooling tank, a measuring cylinder, an electronic scale and a temporary storage tank, the acid tank is connected with the cooling tank through a first pipeline, the first pipeline is provided with a first valve, the measuring cylinder is placed on the electronic scale, and the temporary storage tank is provided with a second valve. The cooling tank is arranged at the end, away from the electronic scale, of the measuring cylinder, a liquid level controller is arranged at the end, close to a cylinder opening, of the measuring cylinder, the bottom end of the measuring cylinder is connected with the temporary storage tank through a second pipeline, and the second pipeline is provided with a second valve. The device for automatically measuring the specific gravity of the sulfuric acid is simple in structure, easy and convenient to operate, capable of automatically measuring the specific gravity of the sulfuric acid, free of manual operation, safe and reliable in the whole process and high in measuring efficiency and measuring accuracy.

The invention discloses a green in-situ preparation method of a high-strength slow-release antibacterial fibrous membrane, which comprises the following steps: dissolving modified chitosan in water to obtain a modified chitosan aqueous solution, and slowly dropwise adding a silver source solution for reaction under the dark and heating conditions to obtain a modified chitosan solution containing nano-silver particles; mixing the solution with water to obtain a dilute solution; dissolving the modified chitosan and a spinning aid in a mixed solvent of a dilute solution and ethanol to obtain a spinning solution; or dissolving modified chitosan in a dilute solution to obtain a modified chitosan solution, dissolving a spinning aid in ethanol to obtain a spinning aid solution, and uniformly mixing the modified chitosan solution and the spinning aid solution to obtain a spinning solution; preparing the high-strength slow-release antibacterial fiber membrane from the spinning solution through a solution jet spinning technology; the modified chitosan contains a reducing group. The prepared high-strength slow-release antibacterial fiber membrane has the functions of high mechanical strength, long-acting antibacterial property and slow release of silver ions.

The present invention relates to a steel plate drilling machine, and belongs to the field of machining technology. A workbench bottom plate is provided on the workbench with inclined sides, a material drop opening is provided at the bottom, a supporting crossbeam is horizontally installed on the workbench, a slide groove is provided on the supporting crossbeam, a clamping block matching the slide groove is provided on the adjustable longitudinal beam, a clamping device is evenly installed around the workbench, a drilling device is installed on the workbench, above the adjustable longitudinal beam, a debris conveyor is installed at the bottom of the workbench, below the material drop opening, and a dust blowing gun is installed on the side of the workbench; the inclined workbench bottom plate facilitates the debris to slide into the material drop opening at the bottom, and is transported and discharged to the outside of the drilling machine through the debris conveyor at the bottom, so as to avoid strip-shaped debris waste from being entangled on the drill bit of the drilling machine, thereby ensuring processing safety, and having a dust blowing gun at the same time, after the drilling work is completed, the accumulated and adhered debris can be blown into the material drop opening through the dust blowing gun, thereby ensuring the cleanliness of the workbench surface, facilitating maintenance, and being conducive to extending the service life of the equipment.

The utility model relates to the technical field of metal plate processing, and discloses an auxiliary clamp holder for metal plate processing, which comprises a fixing seat, a supporting fixing plate and a metal plate, the top end of the fixing seat is fixedly connected with a support, the front side of the support is fixedly connected with a fixing frame, and the left side and the right side of the top end of the supporting fixing plate are fixedly connected with clamping blocks. Cylinders are fixedly connected to the middles of the left side and the right side of the fixing frame, through holes are formed in the middles of the cylinders, clamping pieces are slidably connected to the interiors of the cylinders, inclined grooves are formed in the front side and the rear side of each clamping piece, and through grooves are formed in the middles of the clamping pieces. According to the utility model, different types of supporting and fixing plates can be replaced so as to meet the requirements of fixing different shapes of metal plates and processing different types of metal plates, and the clamping angle and the clamping position can be adjusted according to the shape of a workpiece, so that safe and stable processing at any position can be ensured.

The utility model relates to the technical field of slitting equipment, in particular to a slitting machine for sealing strip processing, which comprises a base, a driving roller is movably mounted above the base up and down, a concave frame is fixedly connected to the upper surface of the base, a cutting roller is detachably mounted at the inner top of the concave frame, a through hole is formed in the center axis of the cutting roller, and the through hole is communicated with the driving roller. The inner wall of the through hole is rotationally connected with a screw through a bearing, the surface of the screw is in threaded connection with a moving block, and a square sliding groove is formed in the inner wall of the through hole. Through the arrangement of the screw rod, the moving block, the inclined plane sliding block, the mounting column and the reset spring, after cutting is completed, the arc-shaped cutting knife can be stored in the arc-shaped groove, an operator can be effectively prevented from being scratched by the arc-shaped cutting knife when the cutting roller is replaced, the personal safety of the operator is guaranteed, the operation risk is reduced, and the working efficiency is improved. And the whole machining process is safer and more reliable.

The invention relates to a method for enriching and recovering rhodium from organic waste liquid containing rhodium acetylacetonate, and belongs to the technical field of precious metal secondary resource recovery. The method comprises the following steps: carrying out reduced pressure evaporation on an organic waste liquid containing rhodium acetylacetonate, separating, condensing and recovering low-boiling-point organic components to obtain a distillation residual liquid containing rhodium acetylacetonate; adding a water phase complex breaking and phase inversion system into the distillation residual liquid, stirring and reacting to break complex of rhodium acetylacetonate and promote rhodium to transfer into a water phase, and separating an organic phase from the water phase to obtain a rhodium-containing water phase; adjusting the rhodium-containing water phase by using an alkaline solution under a stirring condition, stably controlling the pH value to be 6-9, simultaneously dropwise adding a sulfuration precipitant solution, reacting to generate rhodium-containing sulfide precipitates, carrying out heat preservation and aging treatment for 0.5-4 hours, carrying out solid-liquid separation to obtain rhodium enriched products, and sequentially washing and drying the rhodium enriched products to obtain the rhodium enriched products. The method is simple in process and mild in condition, and efficient phase inversion and enrichment recovery of rhodium in the rhodium acetylacetonate-containing organic waste liquid can be realized.

The utility model relates to the technical field of tunnel construction, in particular to a device for curing tunnel lining concrete. The device comprises a door frame structure which is provided with a top frame and side frames, and the two side frames are arranged below the top frame in a spaced mode so as to form a channel facilitating passage; the working platform is arranged on the side, deviating from the channel, of the portal structure; the spraying mechanism is used for spraying water mist to tunnel lining concrete; wherein a guide mechanism is arranged at the top of the portal structure, and a spray head of the spraying mechanism is mounted on the guide mechanism; the guide mechanism extends in the passing direction of the channel and extends out of the door frame structure in a suspended mode, and the spray head can be driven to move to the outer side of the door frame structure. According to the maintenance device, the guide mechanism is arranged to enable the spray head to move relative to the portal structure, so that the operation coverage of the maintenance device is enlarged, the moving frequency of the maintenance device is reduced, and rapid and safe maintenance operation is ensured.

The present invention discloses a method for preparing a porous polymer humidity sensing material with fast response and recovery characteristics, comprising the following steps: (1) ultrasonically mixing a conductive filler with water to obtain a uniform conductive filler dispersion; then adding a water-soluble polymer, stirring and dissolving, to obtain a polymer / conductive filler mixed dispersion; (2) using the polymer / conductive filler mixed dispersion to form a film on an interdigital electrode, then transferring the film-coated interdigital electrode to a non-solvent for the water-soluble polymer and letting it stand, taking it out and removing the solvent to obtain a product porous polymer humidity sensing material. The present invention introduces a porous structure into the polymer / conductive filler film by non-solvent-induced polymer phase separation, thereby improving its fast response and recovery characteristics. The preparation method of the present invention is simple, green and environmentally friendly, and has mild reaction conditions. The prepared porous polymer humidity sensing material has fast response and recovery characteristics, is sensitive to humidity changes, has low delay, and has good stability.

The invention discloses a special-shaped slice grain pressing mold and a forming method, and aims at solving the technical problem that a special-shaped slice grain is difficult to form from the technical problems existing in the forming process of the special-shaped grain. And the mould pressing process is changed into secondary pressing from primary forming. Powder is firstly pressed for the first time until the upper end face of a punch is flush with the upper end face of a die cylinder; and then, the cushion block and the gasket are pulled out, pressurization is conducted again till the set pressure is reached, and pressure maintaining and demolding are conducted. The special-shaped slice grain pressed by the special-shaped slice grain pressing mold is complete in structure, free of cracks and even ring falling, good in physical size consistency, qualified in appearance and free of defects, the process problem of compression molding of the special-shaped slice grain can be solved, the process is safe and reliable, and the product quality is qualified.

The application discloses low-bitter rice residue peptide micelles, a rice residue protein hydrolysate and a preparation method and application thereof, and relates to the technical field of protein processing. The preparation method comprises the following steps: performing step-by-step enzymolysis on rice residue protein to perform directional cutting on the hydrophilic region and the hydrophobic region of the rice residue protein, so as to obtain an amphiphilic polypeptide mixture; adjusting the pH and the temperature, so that the amphiphilic polypeptide mixture is self-assembled to form rice residue peptide micelles, and low-bitter rice residue peptide micelles are obtained. The application aims to solve the technical problems that the existing rice residue protein enzymolysis product has significant bitterness, and traditional debittering technologies have the problems of nutrient loss or the need for external addition. A new mechanism of realizing physical debittering by constructing a supramolecular micelle structure is innovatively proposed and verified. The rice residue protein peptides after enzymolysis are self-assembled to form stable nanometer micelles through step-by-step enzymolysis and directional cutting, so that the hydrophobic groups causing bitterness are selectively embedded in the core of the micelles, and the contact of the hydrophobic groups with taste receptors is physically blocked.

The invention relates to a preparation method of a nickel-based electrode and a method for electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) by using the nickel-based electrode. The nickel-based electrode comprises a substrate material and a catalyst layer, and the catalyst layer is nickel hydroxide in different forms or chromium-doped nickel hydroxide. According to the chromium-doped nickel hydroxide electrode, the catalytic performance of electrooxidation of HMF into 2, 5-furandimethyl (FDCA) can be greatly improved. Taking the nickel-based electrode as an anodic oxidation electrode, taking metal platinum as a cathode electrode, respectively filling two sides of a double-chamber electrolytic cell separated by an ion exchange membrane, adding an alkaline electrolyte into two sides of the electrolytic cell, and adding an HMF solution into the anode side; the electrocatalytic oxidation method is carried out in the electrolytic cell under a certain voltage, the anode is subjected to an HMF electrooxidation reaction and is converted into FDCA, and the cathode is subjected to an electrolytic water hydrogen evolution reaction. The nickel-based catalyst can efficiently electro-catalyze HMF to be oxidized into FDCA, meanwhile, the electrolytic water hydrogen evolution reaction is coupled, and the nickel-based catalyst has excellent catalytic efficiency and stability.

The application relates to a preparation method of (S)-oxetan-2-methylamine and a p-toluenesulfonic acid salt thereof. By adopting a specific preparation route, the problem of poisoning of a palladium-carbon catalyst caused by residual sulfur elements is solved, and the use of explosive and highly toxic sodium azide is avoided. The process is safe and reliable, raw materials are low in price, product quality is good, chiral purity is high, and the method is suitable for industrialized scale production.

The utility model discloses an oiling device for bearing machining, which belongs to the technical field of bearing machining and is characterized by comprising a workbench and an oil tank mounted on the surface of the workbench through a support, an electric oiling device is mounted on the surface of the support, a rotary table is arranged above the workbench, and the rotary table is connected with the oil tank. A plurality of first sliding grooves are evenly formed in the surface of the rotary table. Through the cooperation of the V-shaped groove clamping block and the first spring, the bearing oil injection device is suitable for bearings with different sizes and diameters in a reasonable range, stable clamping is achieved, the positioning rod and the abutting plate are tightly attached to the inner wall of the bearing through the elasticity of the second spring, inner ring positioning is completed, the double-clamping design ensures that the bearing is kept fixed in the oil injection process, and the oil injection efficiency is improved. And the compatibility is high, the clamp does not need to be frequently replaced, the machining efficiency is remarkably improved, pause time is provided for oil injection by arranging the intermittent rotating structure grooved wheel and the Maltese cross, and an operator can conveniently check or adjust the oil injection amount.

The invention discloses a method for preparing vinyl ether by taking ethylene glycol as a raw material. According to the method, industrial raw materials including ethylene glycol and alkyl alcohol which are low in price are adopted, a solid acid catalyst and a solid base catalyst are used for catalyzing an etherification reaction and a cracking reaction respectively, and therefore the vinyl ether product with the high additional value is prepared. The method is good in economic benefit, and the technology and the device are high in universality; a green reaction process is adopted, the process is safe and environment-friendly, and the device can be large-scale; the cracking byproduct alcohol is recycled as an etherification reaction raw material, the raw material utilization rate is high, and energy utilization is reasonable.

The invention discloses a wear-resistant gradient composite coating for the surface of a carbon fiber composite material, and belongs to the technical field of surface protection materials. The coating takes epoxy resin as a matrix, and comprises a boron carbide hard phase in gradient distribution and a multi-phase lubricating system consisting of graphite, molybdenum disulfide and an imidazolium ionic liquid lubricating synergist, wherein the content of boron carbide is gradually increased layer by layer from the bottom layer to the surface layer to form a hardness gradient transition structure. The preparation method comprises the following steps: respectively preparing bottom layer slurry, middle layer slurry and surface layer slurry with different filler contents; sequentially applying each layer of slurry by adopting a layered coating process; and finally, staged curing molding is performed under the low-temperature condition of not exceeding 100 DEG C. Through cooperation of gradient structure design and multi-component lubrication, unification of high hardness, low friction coefficient and strong interface bonding force of the coating is realized under the low-temperature process condition, the wear resistance of the carbon fiber composite material in a harsh friction environment is effectively improved, and the service life of the carbon fiber composite material in the harsh friction environment is effectively prolonged.

The invention provides a manufacturing method and upstream and downstream processes of plastic-free traditional Chinese medicine packaging paper containing traditional Chinese medicine components, and belongs to the technical field of packaging paper manufacturing and processing.The method comprises the steps of fibration treatment of wood traditional Chinese medicine plants and extraction of active ingredients, modification processing of wood chemical method paper pulp and preparation of water-based paint special for the traditional Chinese medicine packaging paper. Manufacturing raw paper of the traditional Chinese medicine packaging paper; and coating the traditional Chinese medicine packaging paper. The paper structurally comprises fiber layer body paper and a functional coating layer. In the technical level, the raw paper relates to active ingredients extracted from wood traditional Chinese medicine plants through a mechanical method at low temperature, the traditional Chinese medicine active ingredients in plant fiber cavities are poured and cured, and the coating relates to a plastic-free formula and a processing method. Through innovative construction of the raw paper fibers and the coating, the paper is endowed with special properties such as antibiosis, insect prevention, moisture prevention, water resistance, high air permeability and the like on the premise of not using plastics and chemicals.

The invention discloses a combined device for absorbing and treating glyoxylic acid synthesis reaction tail gas, and belongs to the technical field of chemical production devices and tail gas recycling. The device mainly comprises an absorption buffer tank, an A-stage absorption device, a B-stage absorption device, a C-stage absorption device, a D-stage absorption device, an induced draft fan, an activated carbon purification box, a harmless airflow outlet, a dilute nitric acid transfer tank and the like, according to the technical scheme, the combined device for absorbing and treating glyoxylic acid synthesis reaction tail gas effectively solves the problem of low absorption efficiency of a previous nitrogen oxide absorption device and the problem of low nitric acid content in absorption liquid, and is relatively beneficial to environmental protection and production cost control; the invention also has the characteristics of safe process, convenient operation and high production efficiency.

The utility model relates to the technical field of optical fiber patch cord processing, in particular to optical fiber patch cord end connector sleeving equipment which comprises a machine body, the machine body comprises a base, a supporting seat is arranged on the upper surface of the base, a pressing seat is fixedly connected to the upper surface of the supporting seat, and a machine frame is fixedly connected to the upper surface of the base. According to the utility model, through the arrangement of the fixing blocks, two ends of an optical fiber patch cord and two ends of a connector can be supported, the clamping blocks can move on the inner sides of the fixing blocks by expanding the clamping blocks, and the clamping blocks can clamp and fix the two ends of the optical fiber patch cord and the two ends of the connector in cooperation with the action of the springs. The optical fiber patch cords and the connectors of different sizes can be fixed through movement of the clamping blocks, so that the connectors are not prone to deflection in the sleeving process, the sleeving quality can be guaranteed, meanwhile, manual supporting and fixing are not needed, manpower can be saved, the optical fiber patch cords and the connectors of different sizes can be fixed through movement of the clamping blocks, and then the flexibility and applicability of sleeving machining can be improved.

This invention relates to the field of N-(2,4-dinitrophenyl)-4-nitrobenzamide preparation technology, specifically to a green method for preparing nitramide compounds. The method involves adding a catalyst and dispersant to a reactor and mixing them uniformly. Then, a first and a second stream of materials are simultaneously added dropwise to the reactor for reaction. The temperature within the system is controlled during the dropwise addition. After the dropwise addition is complete, the temperature is increased to continue the reaction. After the reaction is completed, N-(2,4-dinitrophenyl)-4-nitrobenzamide is obtained through post-treatment. The first stream is a dispersion containing 4-nitro-N-phenylbenzamide, and the second stream is a nitrating agent consisting of a uniform mixture of N₂O₅ and nitric acid. This preparation method features high product conversion rate, a mild reaction process, safe and controllable production process, effectively reduces the amount of residual intermediates, and minimizes pollution.

This utility model relates to the field of PVC pipe processing and discloses a PVC pipe sawing device that facilitates safe clamping. It includes a base and a clamping motor. The clamping motor is fixedly connected to the rear of the base, and a gear is fixedly connected to the output shaft of the clamping motor. The front and rear ends of the gear are respectively meshed with gear rails, and each gear rail has a set of movable seats fixedly connected to its top. This PVC pipe sawing device, by setting up clamping plates, allows for clamping. During clamping, a cylinder is activated, pushing the clamping plates forward via a connector to adjust the clamping position. Then, the clamping motor is activated, driving the gear to rotate, causing the two sets of gear rails to move relative to each other. The two sets of fixed plates then move relative to each other, allowing the two clamps to clamp the PVC pipe from the side. This achieves the action steps of first determining the distance and then clamping, facilitating segmented, fixed-distance cutting with the saw blade. The automatic clamping process is safer and solves the safety problems associated with manual clamping.

The application belongs to the technical field of organic synthesis, and particularly discloses a preparation method of a NiO / Beta supported catalyst and application of the catalyst in synthesis of carvacol, wherein the NiO / Beta supported catalyst is prepared through the following steps: (1) preparing a nickel nitrate aqueous solution, Beta molecular sieve is immersed, and the catalyst precursor is obtained after drying and calcination; (2) the catalyst precursor and a binder are added into a pulverizer and broken and stirred at high speed, then water and glycerol are added into the mixture and stirred and kneaded, the material is formed into a columnar catalyst through an extruding machine, and the columnar NiO / Beta supported catalyst is obtained through a natural air drying, drying and calcination process. The catalyst prepared by the application has a special pore structure, excellent shape selection ability, a large specific surface area, high catalytic activity and reusability. When the catalyst is used in catalytic synthesis of carvacol, two common raw materials, namely, o-cresol and isopropyl alcohol, are adopted, the process is simple and safe, and the reaction has high conversion rate and selectivity.