328results about How to "Low reliability" patented technology

The invention relates to the field of gears. A residual stress intensity factor is introduced into a Walker model, the influence of residual stress on the crack propagation residual life is analyzed, then a crack closing coefficient is introduced to correct the Walker model, and the bending fatigue life of the gear is obtained. The roughness and the dynamic meshing force are added into the model, the dynamic abrasion loss of the gear is calculated according to the improved Archard model, and the contact fatigue life of the gear is obtained; and finally, combining the gear bending fatigue reliability distribution function with the contact fatigue reliability distribution function by adopting a Copula function, and analyzing a competitive failure relationship among different failure forms by utilizing the combined distribution function to obtain a competitive failure reliability model so as to analyze the service life of the gear. According to the technical scheme, the technical problem of comprehensively describing the reliability of the gear is solved, accurate prediction of the reliability of the gear is achieved, and research, development and design of the gear are facilitated.

The present invention discloses an intelligent self-powered active suspension with multi-level adjustable height in the automotive field and a working method thereof. The rod ends of the cylinder rod extending into the oil cylinder are all guide ends composed of a guide, a screw and a nut. There is no seal between the outer wall of the guide and the inner wall of the oil cylinder. The screw and the cylinder rod are provided with oil guide grooves that penetrate the rodless cavity and the rod cavity, and there is no need to consider the sealing problem. A non-closed working oil circuit is adopted, and a suspension height adjustment device comprises a first and a second height adjustment oil and gas cylinders with unequal volumes. The first height adjustment oil and gas cylinder, a third solenoid valve, a high-pressure gas storage tank, a first non-return valve, an electric air compressor unit and a low-pressure gas storage tank are connected in series in sequence, and energy can be pre-stored in advance. Four-speed height control is achieved by two parallel-connected height adjustment oil and gas cylinders with different volumes, so that the vehicle body can be at a low height when the vehicle is driving at high speed, at a normal height when the vehicle body is in urban conditions, and at a height when the vehicle body is driving on bumpy roads. The vehicle body can also be rescued from a pit when the wheel is stuck in it.

The invention discloses an intelligent online detector for a 10kV lightning arrester, and the detector comprises a data collection module which is used for obtaining a DC volt-ampere characteristic curve of the lightning arrester under different test conditions; the data preprocessing module is used for eliminating the linear or nonlinear trend of the volt-ampere characteristic curve and eliminating abnormal values; the piecewise linear fitting module is used for segmenting the volt-ampere characteristic curve and performing linear fitting on data of each segment to obtain linear parameters of each segment; the parameter optimization and separation module is used for optimizing the piecewise linear fitting result, separating the surface leakage current and the valve plate current data correction and calculation module, and performing correction calculation based on the optimized parameters to obtain key electrical parameters; and the state evaluation and early warning module is used for evaluating the operation state of the lightning arrester according to the corrected electrical parameters and providing early warning information. According to the method, instability caused by high-order derivative calculation can be avoided, and the accuracy and stability of an evaluation result are ensured.

The invention relates to the technical field of diode detection, in particular to a vehicle gauge level diode detection method, which comprises the following steps of: acquiring a plurality of pieces of image information of each view of a diode to construct a spatial model of the diode, and determining the qualification of the spatial form of diode packaging based on the overall fitting degree of the spatial model. And determining the diode packaging qualification based on the straight line contact ratio of the pins. Carrying out preliminary detection by using a universal meter based on the packaged qualified diode, and determining the minimum dynamic resistance based on the volt-ampere characteristic curve of the diode under the condition that the access is qualified so as to carry out preliminary grading on the performance of the diode; and the detection voltage is matched based on the preliminary grading result, the temperature of the diode is monitored in real time in the detection process to establish a temperature fluctuation curve, and the maximum change rate and the change range of the temperature are determined based on the temperature fluctuation curve to determine whether the fluctuation evaluation value is adjusted to re-determine the performance grading of the diode. According to the invention, the performance detection efficiency of the diode is improved.

The invention discloses a biological functional scaffold system driven by dual-mode printing, relates to the technical field of biomedicine, and is used for providing more accurate control on the aspects of porosity, cell attachment and surface modification. By integrating two advanced manufacturing technologies of 3D printing and aerosol spraying, the porosity and surface characteristics of the stent can be accurately controlled in the same printing process, and the cell attachment and proliferation environment is optimized. The cooperative working mechanism greatly improves the biocompatibility and mechanical strength of the biological scaffold, and further effectively promotes the tissue regeneration and repair efficiency. The whole manufacturing process is more efficient and accurate due to introduction of the control unit. The control unit automatically adjusts the printing speed and the spraying pressure based on real-time monitoring feedback, the uniformity and stability of the support are ensured, the error rate in the production process is reduced, and therefore the consistency and reliability of products are improved.

The invention is suitable for the technical field of intelligent production, and provides a processing quality monitoring method and system based on an injection molding production line, and the method comprises the steps: firstly, rapidly obtaining the to-be-detected image information of a target mold cavity based on a camera, then effectively generating the to-be-detected contour information according to the to-be-detected image information and a contour extraction algorithm, and carrying out the detection of the to-be-detected contour information. And according to the to-be-detected contour information and the reference contour information, accurately generating plastic residual area information, and finally, based on the plastic residual area information, timely generating optimized production parameter set information. The processing quality of the injection molding production line can be monitored in real time, when residues are detected in the mold, the injection molding process parameters are intelligently and automatically adjusted, it is guaranteed that the residues in the mold are thoroughly discharged, the reliability of the injection molding production line is effectively improved, the stability of the production process is remarkably improved, and the production efficiency is improved. And the material waste condition and the generation of unqualified plastic products are reduced, and the sustainable development transformation of an injection molding production line is facilitated.

The invention relates to the technical field of mechanical transmission, and provides a connecting rod transmission mechanism and a mirror image engine. The connecting rod transmission mechanism comprises a power sliding block, a power connecting rod and two power pistons, the power connecting rod comprises a connecting rod base body and two linear rod parts, the linear rod parts extend in the first direction, the front end of each linear rod part is connected with one power piston, and the rear end of each linear rod part is fixedly connected with the connecting rod base body; the two linear rod parts are located on the two opposite sides of the connecting rod base body in the first direction, and the power sliding block is installed on the connecting rod base body in a sliding mode in the second direction. The linear rod part does not need to contain a bearing, rotation motion does not exist, the overall cross section is uniform or roughly uniform, standard sinusoidal motion / cosine motion is met, the size reduction design of the linear rod part and the air cylinder is facilitated, the compression ratio in the air cylinder is increased, the combustion efficiency is improved, the overall structure of the engine is more compact, and the needed engine cabin space is reduced. And the power-to-weight ratio and the acceleration performance of the vehicle can be improved.

The invention discloses an all-solid-state battery frame structure with a porous structure and double-side supporting thin-layer electrolyte and a preparation method of the all-solid-state battery frame structure. The all-solid-state battery frame structure comprises two layers of porous solid-state electrolyte supporting bodies and a layer of thin-layer solid-state electrolyte, the porous solid electrolyte support bodies are respectively arranged on the upper surface and the lower surface of the thin-layer solid electrolyte as support bodies, and the porous solid electrolyte support bodies have three-dimensional porous structures. According to the all-solid-state battery and the preparation method thereof, the thin-layer solid-state electrolyte of which the two surfaces are supported and homogenous and of a porous solid-state electrolyte structure is prepared through an additive manufacturing technology, and then positive and negative electrode materials are injected into pore channels of a porous solid-state electrolyte supporting body, so that the all-solid-state battery of a 3D structure is constructed, and the thin-layer solid-state electrolyte has low internal resistance; the three-dimensional porous structure support has high reliability; the anode and cathode materials and the solid electrolyte are in three-dimensional contact, and the interface resistance is small.

The invention discloses an industrial park load analysis method based on an optimized K-means clustering algorithm, and the method comprises the steps: collecting the power load data of an industrial park, including the internal data of the total power consumption of equipment, the time-sharing power consumption, the power consumption peak value, the energy consumption of the equipment and the like, and the external data of weather data, electricity price market information, policies and regulations and the like; the method comprises the following steps of: performing unified standardization processing on data, including cleaning and normalizing the data, and filling by adopting a KNN method aiming at the problems of missing values and errors in the data, so as to avoid the problem of low baseline load analysis accuracy caused by errors in data collection; afterwards, a KPCA nonlinear dimension reduction technology is adopted to process a nonlinear relation between the power demand of the production line and external data, the complexity of a model is reduced by simplifying a data set, more nonlinear features in the external data are extracted, and the rule of the power demand of the industrial park can be better mastered; the problem that a power demand side management method is short in processing a non-linear relation is solved.

The invention relates to a double-generator unmanned aerial vehicle power distribution system architecture power distribution system and a power distribution method, and solves the problem that a main generator and a standby generator of an existing power distribution system fail when an engine fails. Comprising a primary power distribution system, a secondary power distribution system, a bus bar control unit BPCU and two electrical load management centers ELMC, the BPCU is responsible for primary power distribution control, and the ELMC is responsible for secondary power distribution control; the BPCU is provided with five power input sources, namely a left generator, a right generator, two ground power supplies and an emergency storage battery pack, and the BPCU distributes the power input sources to seven internal bus bars according to preset logic, namely a left / right generator bus bar, a left / right task bus bar, a left / right key bus bar and a storage battery bus bar; and the two electrical load management centers respectively obtain electric power from the front seven bus bars, and distribute the electric power to the terminal loads through internal SSPCs or direct connection lines. The method can prevent task equipment faults from affecting whole-aircraft power supply, and improves the reliability of fault isolation.

The embodiment of the invention discloses a planning method of a reactive power compensation device of a power distribution network and related equipment. According to the embodiment of the invention, load curves of different types of loads in a transformer area can represent characteristics of large-difference seasonal loads; the built bilevel planning model comprehensively considers energy storage, reactive power compensation device, inverter reactive power regulation capability and traditional reactive power compensation performance; according to the optimal installation position and the optimal capacity of the reactive power compensation device obtained based on the load curves of different types of loads in the transformer area and the bilevel programming model, the problem of voltage out-of-limit of the 10kV transformer area caused by large-scale distributed photovoltaic access and seasonal load distribution can be solved, and the photovoltaic light abandoning rate is reduced; coordinated operation of flexible adjustment equipment of a 10kV system is realized, and the difficulty of considering reliability and economical efficiency of a planning scheme is reduced.

The invention discloses a multi-channel seed counting monitoring system based on data fusion, which is applied to the technical field of automatic seed counting of seed metering devices, and comprises a seed flow dispersion structure, a photoelectric sensor and a signal processing module, the signal processing module is used for processing output signals acquired by the photoelectric sensor from each seed monitoring channel, the method specifically comprises the following steps: determining a seed passing event based on digital signal level change of each seed monitoring channel, and updating a counter in combination with an event triggering interval threshold value to obtain a total seed count; in each time step length, performing state prediction by using an unscented Kalman filtering algorithm, generating Sigma points, propagating the Sigma points by using a system model, calculating a mean value and a covariance of a prediction state, and updating state estimation by combining the propagated Sigma points converted by an observation model; and adjusting the count of the seed monitoring channel and the total seed count based on the updated state estimation, and updating the counter. The seed counting accuracy is improved.

The invention discloses a high-strength and high-elongation SnPbSbInAu alloy solder and a preparation method thereof. The alloy solder comprises the following components in percentage by weight: 33.0 to 36.5 percent of Pb, 2.0 to 4.0 percent of Sb, 1.5 to 3.5 percent of In, 2.0 to 3.5 percent of Au, 0.005 to 0.012 percent of P and the balance of Sn. The preparation method of the foil strip comprises the steps of vacuum pressure casting, strip cold extrusion and cold roller rolling, the wire preparation method comprises the steps of one-time extrusion forming and close-packed rewinding, and the powder paste preparation method comprises the steps of vacuum gas atomization powder preparation, airflow screening and planetary centrifugal degassing paste preparation. The solid-liquid phase temperature of the solder ranges from 180 DEG C to 185 DEG C, the solder has the advantages of being high in ductility, strength and creep resistance, excellent in low-temperature service performance and the like, and the tensile strength of a brazed joint of the solder is two times higher than that of a Sn-37Pb eutectic solder under the same welding process; and the gold etching risk is low, and a gold-plated piece can be directly welded (without tinning treatment).

The invention provides a dynamic loading friction braking energy dissipation ship lock anti-collision device and method. The device comprises a lifting mechanism, a braking mechanism, an arresting mechanism and a steering mechanism. The lifting mechanism comprises a motor, a transmission mechanism, a winding drum and a steel wire rope wound on the winding drum, and the blocking mechanism is moved to a preset height through the steel wire rope for blocking; the blocking mechanism comprises a lower end steel wire rope and an upper end steel wire rope which are arranged on the steering mechanism in parallel in the vertical direction. The steering mechanism is used for guiding the steel wire rope of the lifting mechanism in the vertical direction into the lower end steel wire rope and the upper end steel wire rope of the parallel blocking mechanism; the brake mechanism comprises a brake disc arranged on the winding drum and brake disc brakes installed on the two sides of the brake disc. The technical problems that in the prior art, an anti-collision device is complex in structure, redundant in arrangement, insufficient in blocking performance and the like can be solved.

The invention discloses a multi-quality skeleton sequence action recognition method based on course learning, and the method comprises the steps: collecting a large number of videos which comprise human body actions and are provided with action category labels, and dividing the videos into a training set and a test set; extracting coordinate information of human body joint points of each frame of image in the video, and generating a continuous skeleton sequence; performing data enhancement on the skeleton sequence; according to the method, a neural network model for action recognition is constructed, then data of a training set is input into the neural network model in batches, the neural network model is trained until a preset round number is reached, in the process of training the model, prior knowledge and posterior knowledge are dynamically adjusted to evaluate sample difficulty, and in addition, the training efficiency is improved. The concept of learning the center of gravity is introduced, and the learning center of gravity gradually transits from an early simple sample to a difficult sample in different stages. The method provided by the invention can improve the recognition efficiency and the recognition accuracy.

The invention relates to the technical field of medical informatization, and discloses a hospital equipment informatization monitoring system, and the system comprises a data processing module which is used for collecting historical data of hospital equipment, carrying out the time sequence analysis of the historical data, obtaining the data at the next moment, and carrying out the anomaly detection of the data at the next moment, and obtaining the abnormal data; the data fusion module is used for collecting parameter data of the hospital equipment and carrying out data association on the historical data and the parameter data to obtain associated data; the cooperative control module is used for constructing a multivariable cooperative control equation according to the associated data and the abnormal data, and performing resource optimization on the multivariable cooperative control equation to obtain control adjustment parameters; and the report generation module is used for generating a hospital equipment monitoring informatization report according to the abnormal data and the control adjustment parameters. The hospital equipment informatization monitoring system can solve the problem that an existing hospital equipment informatization monitoring system is still low in reliability.

The invention provides an aircraft launching opportunity determination method, device, system, equipment and medium, and the method comprises the steps: responding to an aircraft launching instruction, and obtaining criterion parameters in real time, the criterion parameters comprising meteorological data, aircraft attitude data and platform actual attitude data, the aircraft attitude data comprises an aircraft pitch angle, an aircraft roll angle and an aircraft yaw angle; obtaining platform prediction attitude data at a pre-execution moment according to the platform actual attitude data at the historical moment, and judging whether the launching platform is in a stable state or not according to the platform prediction attitude data and the platform actual attitude data at the pre-execution moment when the pre-execution moment arrives; and in a stable state, if each item in the criterion parameters meets a preset launching condition and is in an automatic launching mode, determining the target launching opportunity of the aircraft according to the criterion parameters. The method solves the problems that in the prior art, the reliability of the transmitting opportunity is low, and hysteresis exists.

The utility model discloses an expansion kettle support, which comprises an expansion kettle support main body, an expansion kettle and a frame, the upper end of the expansion kettle support main body symmetrically forms support plates through stamping, and the support plates are provided with mounting holes; a first connecting hole, a second connecting hole and a third connecting hole are formed in the side face of the expansion kettle support body, a clamping positioning plate is formed in the middle of the upper end of the expansion kettle support body through stamping, a positioning seat is arranged on the side face of the expansion kettle, and mounting fixing seats are symmetrically arranged on the two sides of the positioning seat. And the mounting fixing seat corresponds to the supporting plate in position, and the positioning seat corresponds to the clamping positioning plate in position, so that the expansion kettle is subjected to double positioning treatment through the supporting plate and the clamping positioning plate. The expansion kettle support is formed by stamping a steel plate, and is simple in structure, short in manufacturing period, low in cost, convenient to assemble and capable of saving manpower, material resources and financial resources.

The invention discloses a wire arranging device for an inductance coil, which can ensure that an inductance wire is wound with uniform tension through a wire winding assembly and a reciprocating assembly which are accurately controlled, and reduce damage caused by wire crossing and stretching at the same time, and a reciprocating screw rod and a reciprocating block system which are driven by a servo motor are arranged, so that the winding efficiency is improved. In addition, the extrusion block and the limiting ring structure in the auxiliary assembly allow automatic adjustment of the extrusion force to adapt to the change of the diameter of the inductance wire, the self-adaption function reduces wire damage caused by mismatching of tension, and the winding quality of the inductance wire is improved. The monitoring assembly improves the control precision of the production process through a real-time thickness detection and marking system, the automation level of operation is improved, the labor cost is reduced, and the production efficiency and the material utilization rate are greatly improved through accurate monitoring and real-time adjustment. And the method has important significance for meeting high-standard industrial application requirements.

The utility model discloses a phase change radiator, a power assembly and a power unit device, and belongs to the technical field of power electronics, the phase change radiator comprises a substrate, a radiating pipeline is arranged in the substrate, a part of the radiating pipeline is internally provided with a phase change material, and one side of the substrate is provided with a plurality of radiating fins; the power assembly comprises an ANPC topological structure, a driving board, a temperature relay, a composite busbar and a phase change radiator, the ANPC topological structure, the driving board and the temperature relay are all arranged on the phase change radiator, the driving board is used for the ANPC topological structure, the temperature relay is used for detecting the temperature of the phase change radiator, and the composite busbar is connected with the driving board; the centralized photovoltaic inverter power unit device comprises a unit rack, a power assembly and a unit control panel are arranged on the unit rack, the power assembly is connected with a discharge resistor, an absorption capacitor, a capacitor, a second composite busbar and an alternating current output bar, and the unit control panel is used for controlling the power assembly.

The invention relates to the technical field of electric power regulation and control, in particular to an electric power regulation and control method and system based on a power characteristic matrix. The method comprises the following steps: obtaining distributed power plant equipment data, carrying out abnormal value replacement, generating complete equipment data, screening out standard operation parameters, carrying out equipment unit simulation processing, generating a simulation power plant equipment unit, and carrying out combined power generation simulation to obtain various simulation data; historical power output data are obtained, power demand analysis is carried out, power output data and power demand peak and valley data required by prediction are generated, based on the data, intensity adaptation screening is carried out on combined power generation simulation, an operation period is adjusted, and finally a distributed equipment scheduling instruction is generated, so that efficient regulation and control of the intelligent virtual power plant are realized. According to the invention, a more efficient and more reliable intelligent power regulation and control method is realized.

The invention relates to a complex copper-nickel-tin alloy pipe and a manufacturing method and application thereof. The complex copper-nickel-tin alloy pipe comprises the following elements in percentage by mass: 5.0%-10.0% of Ni; 4.0% to 8.0% of Sn; zn: less than or equal to 1.0%; zr: less than or equal to 0.2%; fe: less than or equal to 0.1%; less than or equal to 0.1% of Pb; al + Si is less than 0.01%; 0.005% to 0.1% of Re; and the balance of copper and inevitable impurities. The alloy melt is sequentially subjected to mechanical stirring and electromagnetic stirring and solidified to form a cast ingot, the cast ingot is sequentially subjected to hot extrusion, cold deformation, solution treatment, subzero treatment and amplitude modulation decomposition treatment, and the complex copper-nickel-tin alloy pipe with high strength, high yield, high hardness, high wear resistance, good impact toughness and high-temperature oil vapor corrosion resistance can be obtained. The tensile strength of the complex copper-nickel-tin alloy pipe is larger than or equal to 800 MPa, the yield strength is larger than or equal to 650 MPa, the hardness is larger than or equal to 240 HBW, the ductility is larger than or equal to 10%, and the grain size is 6-8 grades.

The invention relates to the technical field of radio positioning, in particular to a helicopter emergency rescue positioning method and system, and the method comprises the following steps: a ground base station captures an initial positioning signal sent by a helicopter in a rescue area, binds the timestamp of the signal with signal data, and analyzes the correlation between the data and time, thereby obtaining a positioning result; signal time stamp data is generated. According to the method and the device, the signal quality is optimized and the stability and the reliability of the signal in an interference environment are enhanced by utilizing time axis inversion and signal amplitude adjustment, and the loss can be reduced, the transmission effect of the signal can be optimized and the overall receiving efficiency of the signal can be improved in a transmission process through encoding processing and signal inversion; the ground base station uses the signal propagation time difference and the path change data to carry out multiple times of comparison and calculate the position of the helicopter in real time, so that the accuracy and efficiency of rescue positioning are remarkably improved, a target is quickly and accurately positioned in emergency rescue, and the success rate and safety of rescue are improved.

The present invention relates to the field of engineering machinery, and discloses a cold start preheating system and engineering machinery. The cold start preheating system includes a fuel preheating module, an antifreeze preheating module, a hydraulic oil preheating module and a main controller. The main controller is configured to: after entering the preheating mode, control the fuel preheating module to start running; when it is determined that the fuel viscosity of the fuel tank is less than a first preset viscosity, control the antifreeze preheating module to start running; when it is determined that the temperature of the battery reaches a first preset temperature, control the hydraulic oil preheating module to start running. The cold start preheating system of the present invention has a short preheating time and a good preheating effect, which can improve the reliability of the engine's smooth cold start in extremely cold areas and shorten the user's waiting time. The cold start preheating system of the present invention can be applied to engineering machinery with a fuel architecture and a new energy architecture.

The invention discloses a message body encryption method, a server, electronic equipment and a storage medium, and relates to the technical field of security encryption, and the message body encryption method applied to the server comprises the following steps: generating a session key according to a received equipment identifier under the condition that the authentication of the electronic equipment is passed; encrypting the session key by using a preset private key to obtain an encrypted string, and sending the encrypted string to the electronic equipment, so that the electronic equipment decrypts the encrypted string by using a preset public key to obtain the session key, and encrypts the initial message body by using the session key to obtain an encrypted message body; under the condition that the encrypted message body and the first algorithm identifier sent by the electronic equipment are received, determining a decryption algorithm according to the first algorithm identifier; and decrypting the encrypted message body by using a decryption algorithm and the session key to obtain an initial message body. Through encrypted transmission, the probability of occurrence of data leakage in the data transmission process is reduced.

The invention discloses a text-to-image diffusion rapid concept erasing method. The method comprises the following steps: (1) acquiring misleading or false images by using an open source website and preprocessing the misleading or false images; (2) constructing a text-to-image diffusion model: designing a target concept erasing strategy by using a knowledge distillation framework; introducing a calibration set to design other concept retention strategies; (3) generating an image corresponding to the text description; according to the method, the specific concept can be erased efficiently, and meanwhile, the semantic consistency of other related concepts is kept, so that the safety and the reliability of an image generation process are remarkably improved.

The invention relates to a leaf vegetable constant-force clamping and conveying mechanism based on a non-circular gear system and a transmission ratio algorithm. The clamping and conveying mechanism comprises a rack and a plurality of constant-force clamping modules installed on the rack. The constant-force clamping module comprises a non-circular gear system, the non-circular gear system comprises a front-end non-circular gear rotationally connected with the mounting shell and a rear-end non-circular gear, and the front-end non-circular gear is in transmission connection with the rear-end non-circular gear through a plurality of middle non-circular gears; a floating connecting rod is fixedly connected to the first rotating shaft, a floating clamping wheel is installed on the floating connecting rod, and the wheel face of the floating clamping wheel abuts against the inner side face of the clamping conveying belt. The constant-force clamping module serves as a core component of the whole clamping and conveying mechanism, and constant-force clamping of leaf vegetables is achieved through the design of a non-circular gear train. The driving module is used for driving the clamping belt to rotate. Clamping damage in the mechanical harvesting process of the leafy vegetables can be avoided, flexible clamping and conveying of the leafy vegetables under different feeding amounts are achieved, and low-damage orderly harvesting of the leafy vegetables is completed.

The invention relates to a fan structure and a household appliance, and relates to the technical field of household appliances. The fan structure comprises a motor, a wind wheel and a connecting assembly. The motor comprises a motor body and an output shaft arranged on the motor body; the wind wheel is arranged on the output shaft in a sleeving mode, a limiting assembly is arranged on the side, away from the motor body, of the wind wheel, and the limiting assembly surrounds the output shaft. The connecting assembly is arranged on the output shaft and located on the side, away from the motor body, of the limiting assembly, and the connecting assembly is matched with the limiting assembly so that the wind wheel can be fixed to the output shaft. According to the technical scheme, the problems that when an existing wind wheel and a motor are installed, a sight blind area exists, the wind wheel and the motor are in a blind installation state, installation is difficult, and installation is not reliable can be solved.

The embodiment of the invention discloses a high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe and a preparation method thereof, relates to the technical field of non-ferrous metal material manufacturing, and aims to solve the technical problem of poor production in the prior art. According to the high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe, the content of Ni ranges from 9.0% to 11.0%, the content of Fe ranges from 1.0% to 2.0%, the content of Mn ranges from 0.5% to 1.0%, the sum of impurity elements does not exceed 0.2%, and the balance is Cu.

The invention relates to the technical field of rock mechanics and geotechnical engineering test devices, and in particular to a rolling friction reduction device used in rock mechanics and geotechnical engineering tests, comprising a movable plate, a fixed plate, an elastic connector and a rolling friction reduction body. The movable plate and the fixed plate are stacked, and the movable plate is composed of a plurality of movable blocks arranged. The movable blocks and the fixed plate, and adjacent movable blocks are connected respectively by elastic connectors. Rolling friction reduction bodies are also provided respectively between the opposite surfaces of the movable blocks and the fixed plate, and between the opposite surfaces of adjacent movable blocks. Under the action of external force, the fixed plate and each movable block constituting the movable plate produce corresponding coordinate position rolling dislocation, and the friction reduction direction is not restricted. Point contact rolling friction reduction is utilized to meet the requirements of bidirectional ultra-low friction reduction, and the elastic connector of the rolling friction reduction device has an automatic reset function, and when the external force disappears, the friction reduction device can be automatically reset and restored.