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Converter control mode switching method and system based on current saturation algorithm
ActiveCN119496214Aavoid failureavoid wastingElectric power transfer ac networkSingle network parallel feeding arrangementsCurrent limitingControl engineering
The invention discloses a current saturation algorithm-based converter control mode switching method and system, and the method comprises the steps: building an outer loop voltage control equation of a fault-free network-building converter, and defining that the converter operates in a constant voltage mode; current limitation of a device under the fault is considered, a dq-axis current reference value under the fault is generated based on a current saturation algorithm, and a current converter is defined to operate in a current limiting mode; after a fault occurs in the constant voltage mode, whether the current amplitude of the converter exceeds the saturation current amplitude which can be borne by the device at the fault moment is judged, and the converter enters the current limiting mode from the constant voltage mode to operate; in the current limiting mode, when a difference value between an actual value and a reference value of active power output by the converter is smaller than a given value, exiting the current limiting mode, and entering a constant voltage mode for operation; and finally, on the basis of a switching rule of the converter between the CVC mode and the CLC mode, obtaining a switching model after the network-forming converter suffers from a fault. According to the invention, automatic switching can be realized to avoid the device overcurrent problem, and the logic is simple and effective.
Owner:XI AN JIAOTONG UNIV
A mining chute device
Owner:JIANGXI XINPENG IND EQUIP MFG CO LTD
Uniform plastering device for construction wall surface
ActiveCN224063864UIncrease operating loadeasy to cleanBuilding constructionsStructural engineeringMechanical engineering
Owner:屈静杰
A method for concentrating and separating organic matter in high-salinity wastewater and separating salt by synchronous freezing and crystallization
ActiveCN118812060BImprove the efficiency of impurity removaleffective and stableWater contaminantsMultistage water/sewage treatmentSaline waterDistillation
The present invention relates to the technical field of waste salt resource utilization and freezing crystallization, and specifically to a method for concentrated separation of organic matter in high-salt wastewater and simultaneous freezing crystallization salt separation. It can treat wastewater containing high-concentration organic matter and salt, and add the wastewater to a hot molten stabilizer for pretreatment; then cool and concentrate the high-salt wastewater solution containing the stabilizer to obtain an organic concentrate, obtain a dissolved stabilizer solution after solvent extraction and distillation, and recover the organic waste liquid; the salt water removed from the organic matter is subjected to low-temperature freezing treatment to form ice crystals and a concentrate; the concentrate is subjected to gradient freezing crystallization to produce ice crystals and high-purity saturated brine; and pure salt is prepared after centrifugal drying treatment. Beneficial effects: This method can not only achieve efficient impurity removal of organic matter in waste salt, but also simultaneously achieve crystallization and salt separation of waste salt, and has the advantages of simple processing procedures, short processing cycles, and modularization.
Owner:NANJING TECH UNIV +2
Coated positive electrode material and preparation method therefor, secondary battery, positive electrode, and electric device
PendingEP4398341A4improve cycle performance and rate performanceavoid generatingPositive electrodesNon-aqueous electrolyte accumulator electrodes
The present disclosure relates to the field of battery electrode material technology, and particularly to a coated cathode material, a preparation method thereof, a battery cathode, a secondary battery, and an electric device; the coated cathode material includes a cathode material matrix, a coprecipitation layer located on a surface of the cathode material matrix, and a passivation layer located on a surface of the coprecipitation layer, the matrix includes a doped layer contiguous with the coprecipitation layer, the doped layer has a thickness less than or equal to 50nm, and composition of the coprecipitation layer includes transition metal phosphate and transition metal oxide. The preparation method according to the present disclosure is rapid and efficient, and the prepared coated cathode material can be used for preparing the secondary battery to improve cycle stability and a rate performance of the battery.
Owner:TIANJIN B&M SCI & TECH LTD
Construction tile stack transport device
The utility model belongs to brick transportation technical field especially is a kind of construction floor tile stacking transport device, including supporting material subassembly, restraint subassembly and positioning assembly, the supporting material subassembly includes supporting plate and outer frame, the outer frame is fixed in the supporting plate outside to connect the positioning assembly;Restraint subassembly includes baffle, cross bar and threaded rod, the utility model is connected positioning assembly and several restraint subassembly from below by setting supporting material subassembly, supporting plate provides the space for the operator to stack hole brick, the two baffles of restraint subassembly are respectively close to the hole brick of transverse row placement and the hole brick of both sides position, cross bar and threaded rod are inserted into the hole inside of hole brick, and two threaded rods are screwed and fixed in the inside of two baffles, to combine whole row hole brick inside restraint subassembly, so that operator can whole row hole brick is placed on supporting plate, also can whole row hole brick be taken out, to facilitate operator to carry out the loading and unloading operation of whole row hole brick quickly.
Owner:SHANDONG JIANAN IOT TECH CO LTD
Guide rail mechanism of cold heading die
ActiveCN222626069Uachieve installationConvenient laborForging/hammering/pressing machinesStructural engineeringMachine
The utility model discloses a cold heading die guide rail mechanism, which relates to the technical field of cold heading die auxiliary installation tools, and comprises a cold heading machine main body, a die box arranged on one side in the cold heading machine main body, a U-shaped bearing frame and a hoisting component, through the arrangement of the U-shaped bearing frame and the hoisting part, when a cold heading die is assembled in a die cavity of a die box, the cold heading die penetrates into the inner side of the slide way from the assembly groove in advance, so that the cold heading die is borne by the slide way, and then the lifting lug is externally connected with a lifting appliance through the sling; the U-shaped bearing frame and the die are integrally lifted to the inner side of the cold header body easily through the lifting appliance, so that the cold heading die corresponds to a die cavity of a die box, manual and simple pushing is facilitated, the die is pushed into the die cavity, die installation is achieved, the manual installation mode in the prior art is effectively replaced, and the production efficiency is improved. And the manual labor intensity and the potential safety hazard are reduced.
Owner:ANHUI YANGTIAN MASCH IND CO LTD
Knee pad for dynamically protecting knee joint
ActiveCN222303162UEffective supporteffective and stableProtective garmentPhysical medicine and rehabilitationMetallic materials
The utility model discloses a knee pad capable of dynamically protecting knee joints, which comprises a weaving cylinder communicated end to end, auxiliary ligament position composite fabrics are symmetrically arranged on two sides of the surface of the weaving cylinder, and memory metal material supporting pieces are arranged in the two auxiliary ligament position composite fabrics along the vertical direction. The opposite sides of the bottoms of the two auxiliary ligament position composite fabrics are jointly provided with a composite fabric pressure adjusting belt, a nanometer buffering material stabilizing piece is arranged on the weaving cylinder, and a patella position composite fabric cutting piece is arranged on the weaving cylinder. According to the utility model, the seamless integrated weaving cylinder, the U-shaped supporting structure and the composite fabric adjusting pressure belt can be always attached to the knee part in a motion state, and during use, the U-shaped supporting structure can effectively support and stabilize the patella without hindering the normal flexion and extension actions of the knee; the fitting degree can be adjusted according to the supporting position of the leg shape of the user through the adjustable composite fabric adjusting pressure belt and the nanometer buffering material stabilizing piece, and the protection effect is improved.
Owner:TOPAZ (XIAN) SPORTS TECH CO LTD
Water and air separation device for removing air from white water spray
ActiveCN117295862Bhigh densityeffective and stableLiquid degasificationMachine wet endEnvironmental engineeringAir separation
The invention relates to a water and air separation device (100) comprising: an intake section (10) having an intake opening (11); a guiding section (20) comprising a housing (24), a separation chamber (40), an inlet (21), a plurality of guiding channels (12) for transporting a white water spray into the separation chamber, a liquid outlet (22), a gas outlet (23), and wherein the guiding section (20) further comprises a first separation plate (41) arranged to divide the separation chamber (40) into a first section (A) and a second section (B), thereby forming a connection passage (46) for allowing white water to enter into the second section (B) below the first separation plate (41) and thereby separate the white water from the air of the white water spray.
Owner:VALMET AB
Rice planting buoyancy tank
ActiveCN224069281Ukeep absorbing moistureprevent floatingSelf-acting watering devicesAgriculture gas emission reductionAgricultural scienceAgricultural engineering
The utility model provides a rice planting buoyancy tank, which relates to the technical field of rice planting, and comprises a buoyancy tank body, a planting groove frame arranged in the buoyancy tank body, and a fixing assembly arranged in the buoyancy tank body, the fixing assembly comprises a grid frame, a placing groove, a water absorption sponge and a sponge strip; the connecting assemblies are arranged on the two sides of the buoyancy tank body, and each connecting assembly comprises a connecting sleeve, a movable rod, a limiting plate and a fixed sleeve. According to the floating box for rice planting, the fixing assemblies can effectively stabilize the rice substrate layer in the containing groove, the substrate layer is prevented from floating, plant positions are prevented from being unstable, rice plants can absorb nutrient substances of the substrate layer better and conveniently, through arrangement of the connecting assemblies, connectivity between the box bodies of the floating box is enhanced, the situation that the floating box falls apart in severe weather is avoided, and the service life of the floating box is prolonged. And the movable rods move in the fixed sleeves, so that it is ensured that the buoyancy tank bodies are disassembled easily, and the buoyancy tank bodies can be collected more conveniently and rapidly.
Owner:ANYUAN COUNTY LIANGPING IND CO LTD
Double-nasal-plug fixing cap
The utility model provides a double-nasal-plug fixing cap. The double-nasal-plug fixing cap comprises a fixing cap body. An annular elastic belt is arranged at the bottom of the fixing cap body and fixedly connected with the fixing cap body. Two sets of connecting parts are oppositely arranged on the two sides of the annular elastic belt, the top ends of the two sets of connecting parts are fixedly connected with the bottom of the fixing cap body, and the two sets of connecting parts are connected with the fixing assembly; a pipeline fixing assembly is further arranged on one side of the fixing cap body, and the two gas conveying pipes penetrate through the pipeline fixing assembly to be connected with the gas conveying assembly. The annular elastic band is arranged at the bottom of the fixing cap body and fixedly connected with the fixing cap body, so that the fixing cap body can be better attached to the head of a user, the fixing performance of the cap is improved, and looseness is avoided; in addition, the fixing assembly adopts the fixing belt in an adjustable connection mode, so that the user can adjust according to personal needs, and the wearing comfort and stability are improved.
Owner:张莉
An ecological slope protection method based on soft soil substrate
ActiveCN115918493Bact as a transition materialImprove stabilityGrowth substratesCulture mediaSucroseSoil science
The present invention mainly relates to an ecological slope protection method based on a soft soil substrate, wherein the soft soil substrate comprises a main material and an auxiliary material, wherein the main material comprises soft soil, and the auxiliary material comprises rice husk ash, fly ash, palm oil fuel ash, polypropylene fiber, sucrase and fruit peel enzyme. The construction process of the present invention is as follows: a soft soil substrate made of a soft soil curing agent is applied to a traditional bare slope, wherein the soft soil curing agent comprises fly ash, rice husk ash and palm oil fuel ash, and polypropylene fiber and sucrase are added after being mixed with the soft soil. After that, the slope surface needs to be repaired and leveled, a small amount of soil layer gap is excavated on the slope surface, and the gap is filled with a soft soil curing substrate that has been prepared in a good proportion, and covered with a layer of geogrid to complete the construction of the slope protection substrate. The present invention can not only effectively recycle fly ash, rice husk ash and palm oil fuel ash, but also reduce environmental pollution, and improve the poor stability of the substrate and the poor soil in the ecological slope protection.
Owner:HUBEI UNIV OF TECH
Air conditioner volute tongue, air conditioner indoor unit and air conditioner
PendingCN119309314AReduce aerodynamic noiseefficient cuttingLighting and heating apparatusNoise suppressionFlow oscillationAir conditioning
The invention discloses an air conditioner volute tongue, an air conditioner indoor unit and an air conditioner in the technical field of air conditioner products. A windward face and an air guide face are arranged on a volute tongue body, a plurality of flow guide ribs are arranged in the length direction of the volute tongue body at intervals, flow guide grooves are formed between the adjacent flow guide ribs, the flow guide ribs are parallel to the cross section of the volute tongue body, and the flow guide ribs are arranged on the windward face in the length extension direction of the flow guide ribs and the depth extension direction of the flow guide ribs perpendicular to the windward face. And the flow guide ribs on the windward side are in a narrow-top and wide-bottom state. When the fan runs at a high speed, due to the fact that the flow guide ribs are in the narrow-end-up form, the flow guide ribs similar to sharp teeth are beneficial to effectively cutting and stabilizing airflow, and the problem that the stability of the cross-flow fan becomes poor due to airflow oscillation is solved; and the sharp tooth structure can improve the pressure pulsation intensity of the airflow and change a blade trailing edge falling vortex structure, so that the aerodynamic noise of the fan is reduced.
Owner:SICHUAN CHANGHONG AIR CONDITIONER CO LTD