176results about How to "Avoid defects" patented technology

The embodiment of the invention discloses a battery cell liquid leakage early warning method and a related device, and the method is applied to a controller of an energy storage container, and comprises the steps: obtaining multi-source monitoring data in real time; performing multi-level early warning judgment according to the multi-source monitoring data; and generating a corresponding control instruction according to a result of the multi-level early warning judgment, the control instruction being used for giving an alarm to the operation and maintenance platform and executing a corresponding protection operation. Thus, through multi-source data fusion cross validation, the defect of a single monitoring technology is effectively overcome, the accuracy and timeliness of early warning of the battery cell leakage fault of the energy storage system are improved, active safety protection is executed in time, and the safety level of the energy storage system is improved.

This invention relates to the field of anti-corrosion coating technology, specifically to a water-based corrosion-inhibiting anti-corrosion coating and its preparation method. When zinc phosphate is used alone as a corrosion inhibitor in water-based anti-corrosion coatings, it tends to agglomerate and has poor compatibility with resins. The protective coating formed on the metal surface by these water-based anti-corrosion coatings exhibits poor and unstable corrosion resistance. To address these problems, this invention provides a water-based corrosion-inhibiting anti-corrosion coating composed of two components, A and B. Component A contains a self-made composite corrosion inhibitor, ZnP-PEG-IPTS-GO. This composite corrosion inhibitor, through the bridging of IPTS, chemically bonds GO, PEG, and zinc phosphate, achieving an organic combination of "physical shielding" and "active passivation," significantly improving the overall anti-corrosion performance of the coating.

The application discloses a lithium-free high-heat-resistant ceramic mud and a preparation method thereof, and relates to the technical field of ceramic materials. In the preparation of the lithium-free high-heat-resistant ceramic mud, alumina is reacted with 3-(2,3-epoxypropoxy) propyl trimethoxysilane to obtain pre-modified alumina; the pre-modified alumina is reacted with starch to obtain modified alumina; ethyl acetoacetate, isopropyl alcohol, zirconium oxychloride, aluminum sec-butoxide, polyvinylpyrrolidone and N-N dimethylformamide are mixed to form a spinning solution, the spinning solution is electrospun, and then immersed in yttrium oxide sol to obtain alumina-zirconia-yttria composite fibers; the modified alumina, talc, alumina-zirconia-yttria fibers, hydroxypropyl methyl cellulose, glycerol, oleic acid, polyethylene glycol and water are stirred and mixed, and vacuum pugging is carried out to obtain the lithium-free high-heat-resistant ceramic mud. The lithium-free high-heat-resistant ceramic mud prepared by the application has good thermal shock resistance and bending strength after sintering.

This invention provides a glass melt conveying device and its temperature control method, comprising an inner wall, an outer wall, and a cavity disposed between the inner and outer walls; both the inner and outer walls are made of refractory materials; the surface of the inner wall is provided with an anti-erosion layer; multiple inner wall temperature detectors are uniformly arranged in the inner wall; the outer sides of the two walls of the cavity are respectively attached to the inner and outer walls; multiple supports are uniformly arranged in the cavity; the two ends of the supports are respectively fixed to the inner sides of the two walls of the cavity. This invention can achieve a heat preservation effect on the bottom and sides of the glass melt through the anti-erosion layer, preventing related defects caused by temperature differences. At the same time, using non-precious metals such as molybdenum as the anti-erosion layer to prevent the glass melt from eroding greatly reduces construction costs; for platinum tube-type glass melt conveying devices, molybdenum electrode heating can be used instead of platinum heating in the high-temperature section, eliminating the situation where the entire channel is electrified, thereby improving production safety.

The application discloses a kind of air spring state monitoring method and device based on wireless ranging, it is related to air spring monitoring technical field.The method includes obtaining the initial parameter data of actual launch pulse feedback by wireless ranging sensor;The theoretical parameter data of air spring inside itself is compared with the initial parameter data obtained in step 1, the state where current air spring is located is judged;According to current state, the actual parameter data of current is obtained by weighting calculation to center distance and surrounding edge distance;Based on the actual parameter data obtained, compare and analyze with theoretical parameter data, monitor the internal state of current air spring.The application integrates ranging sensor in air spring inside by using wireless ranging mode, can realize the monitoring of air spring inside by monitoring pulse data and histogram data and feasibility etc. raw data, solve the problem such as invalidation of measurement data.

The present application relates to the technical field of corrugated pipe RF coaxial cable detection accessories, and particularly relates to a straight insertion connector structure for corrugated pipe RF coaxial cable detection. The inner cavity of the shell is a stepped ring body structure, and a pin is installed in the inner cavity of the shell; an insulator is installed in the middle ring segment cavity of the inner cavity of the shell, and the insulator tightly holds the pin, and the end of the pin towards the mating cable is provided with an inner contact spring body; an outer contact spring body is installed in the right ring segment cavity of the inner cavity of the shell and is positioned by a positioning member; the inner contact spring body and the outer contact spring body are coaxially arranged, the inner contact spring body and the outer contact spring body are inserted into the mating cable, and elastic contact is formed between the inner contact spring body, the outer contact spring body and the mating cable, thereby completing the installation of the cable detection connector. The complex installation of the connector in the detection process is reduced, the detection efficiency is improved under the premise of meeting the stability and accuracy of the detection data, and the detection cost is reduced.

The invention provides a double-shaft-shoulder friction stir welding device with an adjustable shaft shoulder distance and a friction stir girth welding method of the double-shaft-shoulder friction stir welding device. The device comprises an adjustable double-shaft-shoulder stirring tool (1), a rotating main shaft (3), a withdrawing shaft (4), a clamp (5), a positioning platform (6) and a workbench (7), the adjustable double-shaft-shoulder stirring tool (1) is composed of an upper shaft shoulder, a lower shaft shoulder and an adjustable stirring needle, and the rotating main shaft (3) is adopted for controlling rotation of the adjustable double-shaft-shoulder stirring tool (1); and the withdrawing shaft (4) is adopted to adjust the length of the stirring needle. According to the adjustable stirring device, the adjustable stirring needle can freely stretch out and draw back through the withdrawing shaft (4), so that the distance between the shafts can be controlled, and the adjustable stirring device can adapt to welded workpieces (2) with different plate thicknesses. In addition, the press-in amount of the upper shaft shoulder and the lower shaft shoulder can be adjusted in the welding process, and welding forming is better facilitated. The adjustable double-shaft-shoulder stirring tool (1) is not only suitable for common welding seams, but also suitable for closed circumferential welding seams.

The utility model belongs to the technical field of rechargeable battery, concretely relates to a magnetic attraction battery of exempting from welding, including shell, the shell is from one end to the other end in proper order is provided with electric core, gum seat, PCB board and magnetic attraction joint, be provided with positive and negative electrode pad on the PCB board, the positive and negative electrode pad position electric connection has exempting from welding terminal, the positive and negative pole pin foot of electric core is inserted into exempting from welding terminal and forms electric connection with PCB board, the utility model provides a magnetic attraction battery of exempting from welding can carry out quick plug -in with the electric core pin of battery, forms electric connection, avoids the defect of traditional welding process, improves production efficiency and battery reliability, is convenient for maintenance and recycling.

This application discloses a target localization method, apparatus, electronic device, and storage medium. The method includes: acquiring an original image captured by a fisheye camera and ground reference pixels on the original image; performing semantic segmentation on the original image to obtain a semantic segmentation result for each target, and obtaining a set of candidate pixels for calculating the target's grounding pixel based on the semantic segmentation result; obtaining the target's grounding pixel based on the distance relationship between each candidate pixel in the candidate pixel set and the ground reference pixel; and obtaining the target's true grounding point based on the target's grounding pixel and the calibration parameters of the fisheye camera. The technical solution of this application can accurately identify the true grounding point of a target based on the original image from the fisheye camera.

The utility model relates to a bottle and can material channel system which comprises a material channel and a separating structure which divides the material channel into a plurality of areas, each area is provided with a temperature monitoring device used for monitoring temperature, and the areas comprise an upper flame area and a bottom material conveying area. According to the utility model, the main material channel and the branch material channels are divided into a plurality of independent areas, and the thermocouple is arranged in each area for accurate temperature measurement and independent temperature control, so that the defects of glass stripes, bubbles, knots and the like caused by abnormal temperature of the material channels can be effectively avoided; the molten glass is enabled to enter a product machine to be molded in a stable and appropriate temperature environment, so that the quality and the yield of glass bottle tank products are greatly improved, and the competitiveness of the products in the market is enhanced.

A multi-source error compensation and high-precision fusion method for satellite inertial integrated navigation belongs to the technical field of integrated navigation, and mainly comprises the following steps: constructing an inertial error model containing gyroscopic drift and accelerometer zero offset, and realizing online calibration compensation of installation errors through observability analysis; a multi-rate Kalman filtering framework is designed, and synchronous fusion of inertial navigation high-frequency data and star sensor low-frequency data is completed; a historical fixed star vector equivalent compensation strategy is introduced, and the filtering weight is dynamically adjusted in combination with an astronomical attitude determination error model, so that stable attitude determination under a complex observation condition is realized. According to the method, the fusion precision, autonomy and anti-interference performance of integrated navigation can be effectively improved, stable and reliable attitude determination support is provided for aircrafts and the like with strict requirements on navigation performance, and the method has wide engineering application value.

The application discloses an electrical cabinet surface treatment process and an electrical cabinet, and relates to the technical field of electrical cabinets, and comprises the following steps: step one, rust removal, degreasing, water washing and drying pretreatment are carried out on the electrical cabinet; step two, the pretreated electrical cabinet is subjected to hot galvanizing to form a hot galvanizing primer; step three, the electrical cabinet is placed on a rotating disc, the rotating disc is driven to rotate by a first driving device, a spray gun is driven to reciprocate up and down by a second driving device, and the spray gun is started to spray epoxy paint on the electrical cabinet; step four, the electrical cabinet is subjected to solidification and natural cooling for multiple times; and step five, the surface of the electrical cabinet is inspected, and the areas with slight defects are repaired and sprayed. The application can improve the surface treatment quality of the electrical cabinet.

The invention relates to the technical field of wind-induced vibration analysis and anti-vibration design of power transmission lines, and discloses a cross-section grading anti-vibration design method for key wires of an ice-coated power transmission line and related equipment. Constructing a multi-point time history of the non-uniform wind field of the complex terrain based on the tower-line coupled three-dimensional finite element model, and setting load working condition parameters; performing transient dynamic analysis on the tower-line coupled three-dimensional finite element model, and constructing a response database; identifying a key conductor in a conductor group scale based on the response database, and evaluating interphase response discreteness; quantifying the low-order frequency band energy gathering and power selective amplification effect at the key lead scale, and determining a key phase; and identifying a dangerous section in the along-span and component scale, generating a cross-section grading anti-vibration design strategy, and carrying out cross-section grading anti-vibration design on the key conductor of the ice-coated power transmission line according to the cross-section grading anti-vibration design strategy. According to the invention, adaptability and precision of wind-induced vibration protection of the ice-coated power transmission line in the complex terrain are improved.

The invention discloses an ice rink detection trolley based on UWB positioning and a detection method thereof, and relates to the technical field of automatic detection robots. The intelligent trolley body realizes motion control through a path planning result, the vehicle-mounted NUC lower computer cooperates with the remote control upper computer to realize remote control and data reading, the UWB positioning module cooperates with the UWB base station to solve the current position, the laser radar sensor is used for obstacle detection and local path re-planning, the IMU attitude sensor acquires an attitude angle, and the vehicle-mounted NUC lower computer cooperates with the remote control upper computer to realize remote control and data reading. The temperature and humidity sensor, the illumination sensor and the infrared temperature sensor are used for respectively measuring environment temperature and humidity, illumination intensity above the ice surface and ice surface temperature, and the communication module is used for realizing real-time data transmission. Multiple sensors are integrated and carried on the basis of an intelligent trolley body, the automation degree is improved, manual intervention is reduced, the positioning precision and repeatability of a detection point location can be guaranteed, the dynamic obstacle avoidance capacity is achieved in combination with path planning, and one-time synchronous collection of multiple parameters of a single point location is achieved.

The invention discloses a preparation method of a magnesium alloy plate with a gradient twin structure, and belongs to the technical field of heterostructure material preparation. According to the method, firstly, a magnesium alloy plate serves as a base plate, magnesium alloy wires of the same mark are adopted for double-heat-source auxiliary heating stirring friction solid-phase additive manufacturing, and a deposition plate with crystal grains preferentially oriented in the thickness direction is obtained by regulating and controlling the heating temperature and deposition head process parameters; keeping the heating state of the substrate, performing heat source-assisted ultrasonic rolling on the deposited plate, and enabling crystal grains in the thickness direction of the plate to generate twinning deformation of different degrees by regulating and controlling rolling parameters; and finally, separating the substrate from the deposition plate to obtain the magnesium alloy plate with the gradient twin structure. Heterogeneous particles are not introduced, the material is pure, the technological process is short, the production efficiency is high, the cost is low, the prepared plate is small in grain, the gradient twin crystal structure penetrates through the thickness, the comprehensive performance is excellent, and the method is suitable for industrial production and can be applied to the fields of automobiles, aerospace, medical instruments and the like.

The utility model belongs to the technical field of molds, and relates to an injection mold for a storage box body with imitation sewing leather patterns. The storage box body forming mold comprises a storage box body forming lower mold and a storage box body forming upper mold, and an injection molding piece is arranged above the storage box body forming upper mold. In the using process, the pattern forming grooves and the stitch-imitating leather pattern forming protrusions are correspondingly arranged on the upper mold and the lower mold, stitch-imitating leather patterns can be accurately formed on the surface of the storage box body, and then due to the optimized design of the rotating shaft forming structure, the pattern forming efficiency is improved. The rotating shaft positioning convex block is matched with the rotating shaft positioning groove, and the rotating shaft forming middle cavity is matched with the rotating shaft forming middle bulge, so that the main body, the rotating shaft and the surface with unique textures of the storage box body can be integrally formed, the production efficiency is improved, the subsequent processing procedures are reduced, the production cost is reduced, and meanwhile, the product quality is improved. And the size precision and the forming quality of the product are guaranteed through precise matching of all the parts.

The utility model discloses a high-temperature-resistant lining oil pumping pipe, which relates to the technical field of oil exploitation and comprises an oil pumping pipe body, a lining pipe is arranged inside the oil pumping pipe body, the outer side of the oil pumping pipe body is in threaded connection with a coupling main body, and a sealing ring is fixedly connected inside the coupling main body. One end of the sealing ring abuts against one end of the oil pumping pipe body and one end of the lining pipe, the oil pumping pipe body is made of alloy steel materials, and a heat insulation layer is arranged on the outer side of the oil pumping pipe body. According to the oil pumping pipe with the high-temperature-resistant lining, the oil pumping pipe body made of alloy steel materials containing high chromium and nickel elements is combined with the heat insulation layer wrapped by the outer-layer heat-resistant fiber materials and the polytetrafluoroethylene lining pipe to form a composite material structure. Not only are many defects of a traditional pipeline in the high-temperature and high-pressure environment effectively overcome, but also the efficiency and the safety of the whole system are improved, and the strict requirements of modern oil exploitation for equipment are met.

The application discloses a multi-agent material calculation consistency calibration method, belonging to the cross field of material science, artificial intelligence and computational physics. The method adopts a master-slave structure multi-agent system, containing one master agent and at least three slave agents. The master agent is responsible for overall coordination, embedding physical mechanism constraints, consistency calibration and output results. The method steps are: constructing a calculation system, introducing physical mechanism constraints and embedding slave agent calculation models, collecting calculation data, performing bias analysis, adjusting parameters or correcting results through iterative calibration, and finally verifying and outputting the final results. The application introduces physical mechanism constraints, combines bias analysis and iterative calibration, and solves the problems of poor consistency of existing multi-agent material calculation results and easy violation of physical laws. Experiments show that the method reduces the deviation of the calculation results and the experimental measured values to below 3%, improves the calibration efficiency by more than 40%, and improves the calculation accuracy by more than 35% compared with the prior art, thereby improving the accuracy and engineering practicability of high-throughput calculation of material performance.

The invention discloses an environment-friendly high-performance titanium alloy polishing composition as well as a preparation method and application thereof, and relates to the technical field of metal material surface treatment. According to the environment-friendly high-performance titanium alloy polishing composition, the pH value of a basic system is adjusted to 9.5-10.0 through a pH adjusting agent; the base system comprises the following components in percentage by mass: 10-30% of silica sol, 3-4% of an anti-gel stabilizer (urea or methylurea), 2-3% of a heat transfer improvement and surface defect inhibitor (ethylene glycol or propylene glycol), 0.1-0.2% of a wetting leveling agent, 1-2% of an alcohol amine complexing agent and 0.5-1% of an aminopolycarboxylic acid chelating agent besides water. According to the environment-friendly high-performance titanium alloy polishing composition, on the premise that an oxidizing agent is completely abandoned, perfect balance of high stability, high polishing rate and excellent surface quality is achieved through unique formula design, and the environment-friendly high-performance titanium alloy polishing composition has the advantages of being environmentally friendly and high in safety.

The application provides a core-shell structure high-temperature-resistant acrylic pressure-sensitive adhesive and a preparation method thereof. The pressure-sensitive adhesive adopts a core-shell structure design, a polymer with a high glass transition temperature is selected as a core layer, a low glass transition temperature adhesive monomer is used to prepare a shell layer, a flexible chain segment is used to provide room temperature adhesion, and the core layer is used to avoid excessive softening at high temperature. The core layer remains stable at high temperature, the shell layer forms hydrogen bonds or chemical bonds with the substrate through polar groups, and the adhesion is maintained. The addition of modified fillers further improves the high-temperature resistance of the pressure-sensitive adhesive.

According to embodiments disclosed herein, an electronic device includes a communication circuitry in communication with a drying apparatus including a plurality of drying areas for drying an introduced electrode, and a plurality of heating apparatuses respectively provided in correspondence with the plurality of drying areas to provide heat to the electrode; a memory for storing one or more instructions; and a processor. The one or more instructions, when executed, can be configured to cause the processor to, upon a shutdown of the drying apparatus, acquire operation state information of the drying apparatus, acquire state information of at least one electrode introduced into the drying apparatus, determine an output of each of the plurality of heating apparatuses based on the operation state information of the drying apparatus and the state information of the at least one electrode, and control the plurality of heating apparatuses based on the determined output of each of the plurality of heating apparatuses.

This invention relates to the field of functional liquid crystal materials technology, and discloses a method for preparing and applying a spiropyran-based ionic conductive cholesteric phase liquid crystal elastomer with multimodal sensing characteristics. This liquid crystal elastomer is prepared by co-polymerization of a spiropyran derivative as the core unit for photo / thermal / mechanical response with polymerizable liquid crystal monomers, chiral agents, thiol crosslinking agents, ionic liquids, and initiators. Its core mechanism is that the microscopic isomerization of spiropyran molecules is amplified into a change in the mesoscopic polymer arrangement through intermolecular synergistic effects. Simultaneously, relying on the intrinsic conductivity difference between the ionic anthocyanin (MC) and non-ionic spirocyclic (SP) phases, precise control of macroscopic conductivity is achieved. This composite material achieves multiple responses with a single spiropyran component, enabling the construction of multimodal flexible sensors. It addresses the pain points of complex structures and poor compatibility in traditional sensors, and has significant research value in fields such as smart wearables, electronic skin, and healthcare.

This invention relates to the field of nanoprinting plate technology, and more particularly to a coating material for nanoprinting plates and its preparation method. The preparation method includes: feeding nanoparticles, film-forming resin, curing agent, dispersant, solvent, and dye into a high-speed disperser for pre-dispersion to form a first dispersion; obtaining the vibration value of the sleeve at the temperature sensor probe during the pre-dispersion process and determining the maximum and minimum speeds of the high-speed disperser; obtaining the drive current deviation value of the motor of the high-speed disperser and determining the reverse rotation time of the motor; grinding the dispersion to be ground, and calculating the hardness of the residual hard agglomerates based on the drive current deviation value and determining the outlet back pressure of the feed pump of the sand mill; completing the grinding process according to the outlet back pressure to obtain a grinding slurry; adding a leveling agent to the grinding slurry to obtain the finished coating material for nanoprinting plates. This invention improves the film-forming performance of the finished coating material for nanoprinting plates.

Embodiments of the present application disclose a training method and device of a pre-training model applied to a three-dimensional image and equipment, and belong to the technical field of artificial intelligence. The method comprises the following steps: repeating the following steps until a preset condition is reached: determining a first feature vector of a to-be-processed mask image based on a first to-be-trained model, determining a second feature vector of a to-be-processed three-dimensional image; obtaining a third feature vector of each other three-dimensional image; updating the parameters of the first to-be-trained model according to the first feature vector, the second feature vector and the third feature vectors; and the first to-be-trained model after the preset condition is reached can extract a feature map of the three-dimensional image. The first feature vector and the second feature vector of the same to-be-processed three-dimensional image form a positive sample pair, the first feature vector of the to-be-processed three-dimensional image and the third feature vector of the other three-dimensional image form a negative sample pair, and the parameters of the first to-be-trained model are updated. The obtained model can accurately obtain a feature map of the three-dimensional image.

The application discloses a kind of based on product quality pre-judgment injection molding process parameter gradual dynamic adjustment method.It includes the following steps: define prophet-LSTM based defect function;Prophet-LSTM based hybrid model is constructed and trained;Obtain and introduce correction factor with preprocessed injection molding key state data;Set variation degree judgment condition;Using prophet-LSTM model based parameter pre-judgment and adjustment, complete injection molding process parameter gradual process adjustment.The application can analyze the influence law of periodic working condition factors on injection molding machine production process, fuse multidimensional factors to predict possible defects of injection molded products, and adjust injection molding process parameters in advance, which helps to avoid the generation of injection molded product defects and maintain high consistency of quality.

The cleaning apparatus according to one embodiment of the present invention may comprise: an image capturing unit that captures an image of a surface of a flat substrate including a wafer or a mask; a laser unit configured to irradiate a laser beam to a target position when the target position to which a foreign object is attached is confirmed by the imaging unit; a cleaning unit that sprays a gas toward the target position and a peripheral portion thereof; and a suction unit that sucks in the suspended matter generated by the laser unit and / or the cleaning unit.

This invention provides a bidirectional feedback collaborative optimization method, medium, and device for pedestrian detection and tracking. The method includes: generating an initial set of detection boxes using a detector for the current frame image; generating virtual detection boxes using trajectory-guided detection completion; obtaining the detection box set after verification; and employing bidirectional feedback collaborative optimization of the detector and tracker, including: feeding the virtual detection boxes as positive hard examples back to the detector for optimization; feeding back high-confidence real detection boxes from the detection box set to the tracker for tracker updates; and performing a second data association using the verified detection box set and the tracker optimized by bidirectional feedback, ultimately outputting a set of pedestrian trajectories. This method can solve the problems of error accumulation, false detection propagation, and trajectory fragmentation caused by the unidirectional serial interaction between the detector and tracker in existing MOT systems.

The invention discloses a metal phosphate catalyst as well as a preparation method and application thereof in Friedel-Crafts reaction. The catalyst is composed of transition metal ions and phosphate ions, the molar ratio of phosphorus to the transition metal elements is 1: (0.5-7), the total acid amount of the catalyst is in positive correlation with the catalytic activity, and the higher the total acid amount is, the better the reaction effect is. The preparation method comprises the following steps: dissolving a transition metal soluble salt in deionized water, adding a phosphate aqueous solution, stirring to generate a precipitate, dropwise adding nitric acid to dissolve the precipitate, adding urea to obtain a mixed solution, and carrying out hydrothermal reaction, washing, suction filtration and drying to obtain a finished product. During application, the catalyst, phenol and alcohol are put into an intermittent reaction kettle, nitrogen is introduced to maintain stable pressure, heating and stirring reaction are performed, and an alkylphenol product is directly obtained. The catalyst is excellent in catalytic performance, mild in reaction condition and convenient to operate, the alcohol conversion rate and the selectivity of target alkylphenol can be effectively increased, meanwhile, the high conversion rate of acyl chloride is achieved in the acylation process, the process economy is improved, and an efficient and feasible technical scheme is provided for the Friedel-Crafts reaction.

The utility model discloses an efficient forming motorcycle clutch combined die-casting die, which belongs to the technical field of die-casting dies, and comprises an upper die holder and a lower die holder, the bottom of the upper die holder is fixedly connected with an upper die core, the top of the lower die holder is fixedly connected with a lower die core, and the upper die core and the lower die core form a cavity after die assembly. A pouring gate used for injecting molten metal into the cavity is arranged in the upper die base and comprises a main runner and a plurality of branch runners communicated with the main runner, flow adjusting blocks are arranged in the branch runners, flow dividing holes are formed in the flow adjusting blocks, and the flow adjusting blocks are installed in the branch runners through bolts. And cooling water channels communicated with the cavity are arranged in the upper die holder and the lower die holder. According to the utility model, the die structure is optimized, such as reasonable structures such as the pouring gate, the cooling water channel and the ejector pin, so that the die-casting forming efficiency and the product quality of the motorcycle clutch are improved.

The invention relates to the technical field of corrosion inhibition, in particular to a composite corrosion inhibitor for an oil field pipeline and a preparation method of the composite corrosion inhibitor, and the composite corrosion inhibitor comprises an N-thiourea acetyl-ethoxylation modified imidazoline intermediate, a 2-pyridylaldehyde-diphenylamine-4-sodium sulfonate condensate, sodium cyanoboride and methanol. The preparation method comprises the following steps: carrying out cyclization, ethoxylation and thiourea acetylation on fatty acid and polyamine to prepare an N-thiourea acetyl-ethoxylation modified imidazoline intermediate, and dissolving the N-thiourea acetyl-ethoxylation modified imidazoline intermediate, 2-pyridylaldehyde, a diphenylamine-4-sodium sulfonate condensate and sodium cyanoboride in methanol according to a specific mass ratio to form the composite corrosion inhibitor. The technical problem that an oil field pipeline is poor in corrosion protection effect in a high-temperature, high-pressure, high-salinity and CO2 / H2S coexistence environment is solved, and synergistic and efficient corrosion prevention of multiple active components is achieved.