40results about How to "Made precisely" patented technology

The invention provides an electromagnetic field composite powder feeding type plasma arc additive manufacturing formability regulation and control method and system, and relates to the technical field of plasma arc additive manufacturing. The flowing direction and speed of liquid metal in a molten pool in the deposition process are regulated and controlled through the target composite electromagnetic field, and the morphology and the internal organization structure of a deposition layer are controlled; in the process of regulating and controlling the liquid metal in the molten pool, process parameters and molten pool dynamic image data in the deposition process are collected in real time, and a pre-trained state recognition model is used for conducting self-adaptive adjustment on the process parameters of a subsequent deposition layer; and after deposition of each layer is completed, a laser scanning system is adopted for measuring the actual geometric size and surface appearance of the deposition layer, deposition manufacturing of the next layer is executed based on the optimized composite electromagnetic field control parameters, the corrected layered slicing data and the process path, and the execution is executed circularly till manufacturing of the whole workpiece is completed.

The invention discloses a method for preparing PDRN with different molecular weights and application of the method. Salmonidae testis are taken, protamine cells are subjected to enzymolysis through protease K, enzymatic hydrolysate is pretreated through ultrasonic waves, a pretreated sample is subjected to DNaseI enzymolysis, and therefore PDRN with the target molecular weight is obtained. According to the method, the problem of single molecular weight of PDRN in the prior art is solved, and products with different molecular weight ranges can be accurately prepared by combining ultrasonic treatment with DNaseI enzymolysis, namely changing the power and time of ultrasonic treatment and the enzyme amount and enzymolysis time of DNaseI; the molecular weight range can be concentrated in 500-1000 bp, 1000-2000 bp and 2000-4000 bp, the situation that the molecular weight range is wide and fragments are not concentrated is effectively avoided, the product specification is relatively concentrated, and the method is suitable for industrial application.

The invention discloses a double-screw compressor rotor profile and a double-screw compressor, and belongs to the technical field of compressors, the rotor profile comprises a male rotor tooth curve and a female rotor tooth curve, the male rotor tooth curve comprises an A1B1 section, a B1C1 section, a C1D1 section, a D1E1 section, an E1F1 section, an F1G1 section, a G1H1 section and an H1I1 section which are sequentially and smoothly connected; the tooth curve of the female rotor comprises an A2B2 section, a B2C2 section, a C2D2 section, a D2E2 section, an E2F2 section, an F2G2 section, a G2H2 section and an H2I2 section which are sequentially and smoothly connected. The tooth curve of the male rotor is obtained by converting the rack line from a rack coordinate system to a tooth profile coordinate system of the male rotor; and the female rotor tooth curve is obtained by converting the rack line from the rack coordinate system to the tooth profile coordinate system of the female rotor. By means of the sectional tooth curve, the large calculation amount caused by directly optimizing the female rotor profile and the male rotor profile can be avoided, and therefore the design efficiency of the rotor profiles is improved.

The invention belongs to the technical field of material preparation, and particularly relates to a high-thermal-conductivity copper-diamond composite material preparation method which comprises the following steps of (1) raw material preparation, (2) SLM equipment preparation and preheating, (3) model printing, (4) heat treatment, (5) finish machining and (6) classified inspection and storage. The screened diamond powder is cleaned and dried through alcohol, workers can conveniently operate and use the diamond powder, manufacturing of the composite material is more accurate, SLM equipment is cleaned through a dust collector, machining operation of the composite material is convenient, the situation that the composite material carries scraps during machining is avoided, and through heat treatment, the machining efficiency is improved. The composite material can be conveniently processed and operated, the mechanical property of the material can be improved, the structure and the organization of the material can be adjusted, the defects of the material can be repaired and improved, workers can conveniently inspect through inspection and storage, and the probability that the composite material has problems during use is smaller.

The embodiment of the invention provides an exposure system, an exposure method, a diffractive optical element and intelligent head-mounted equipment. Wherein the exposure system comprises a metasurface device and an exposure substrate, the exposure substrate is located on the light emitting side of the metasurface device, and the center of the metasurface device and the center of the exposure substrate are located on the same optical axis; the metasurface device is configured to enable incident linearly polarized light LP to form right-handed circularly polarized light RCP and left-handed circularly polarized light LCP, wherein the propagation directions of the right-handed circularly polarized light RCP and the left-handed circularly polarized light LCP deflect by an angle theta relative to the optical axis; the exposure substrate is located in an overlapping area of the right-handed circularly polarized light RCP and the left-handed circularly polarized light LCP, and the right-handed circularly polarized light RCP and the left-handed circularly polarized light LCP can form an overlapped interference light field on the exposure substrate, so that the polarization holographic grating is manufactured on the exposure substrate.

The invention relates to the technical field of medical instruments, and discloses a preparation method of a customized mitral valve forming ring. The technical problems that in the prior art, the specification and model selection of a mitral valve forming ring is limited, and the valve ring cannot be completely matched with the physiological structure of a patient are solved. The method comprises the following steps: obtaining shape parameters of a mitral valve forming ring at a lesion of a patient through multi-modal imageology imaging; a three-dimensional model of the diseased region is constructed, a lesion model is reconstructed, and a healthy mitral valve forming ring structure model is obtained; fusion printing forming is conducted through a micro-scale laser powder bed, a laser beam is scanned according to a certain strip width, and in the fusion process of each layer, the laser scanning path rotates by a certain angle relative to the scanning path of a base plate or the scanning path of the previous layer. It is guaranteed that the artificial mitral valve ring can be perfectly matched with the physiological structure of a patient, and individual differences are reduced.

The application belongs to the technical field of food preparation, and relates to a preparation method of PE emulsion prepared from citrus peel residues and high-dietary-fiber fat-reducing mayonnaise. The preparation method of the PE emulsion is as follows: (1) the dried and crushed citrus peel residues are soaked and pretreated with acidic oxidized electrolytic water, and after the soaking is completed, the activated materials are obtained by washing, drying and sieving; (2) the activated materials are mixed with water and then subjected to water bath heating treatment, and the citrus peel residue fiber concentrate is obtained by drying the residue; (3) the citrus peel residue fiber concentrate is dispersed and then subjected to colloid mill pretreatment and wet ball milling, and the citrus peel residue-based colloid suspension is obtained after the wet ball milling; and (4) the citrus peel residue-based colloid suspension is mixed with vegetable oil and then subjected to shearing homogenization to obtain a coarse emulsion, and then the coarse emulsion is subjected to ultrasonic treatment, and finally the citrus peel residue-based PE emulsion is obtained. The problems of unstable structure, easy oxidation, poor storage stability and poor taste of the fat-reducing mayonnaise prepared by using the PE emulsion are solved.

The invention provides a transparent glass luminous sign, which relates to the field of luminous sign boards. The luminous sign comprises a luminous body, a transparent glass plate and a translucent body. The electrical components and the components for displaying luminous patterns in the traditional luminous sign are respectively arranged and isolated in mutually independent spaces on both sides of the transparent glass plate. In particular, when the sign is applied to environments such as shop window glass or door and window glass of a store, the circuit part (luminous body) and the display part (translucent body) are respectively arranged and isolated in two indoor and outdoor spaces of the store, so as to achieve physical isolation and functional combination, exist independently of each other, be free from weather interference, and be more reasonable and safe in application. The ready-made shop window glass is used as the skeleton and carrier of the entire luminous sign to combine all the components into one, and the invisible visual characteristics of the shop window glass and the fact that the luminous body cannot be seen from the front are utilized to highlight the luminous effect of the translucent body. The sign has the characteristics of simple structure, convenient processing, low cost, safe application, and slim and beautiful appearance.

The invention discloses a high-pressure gas cylinder applied to a liquid nitrogen environment and a machining method of the high-pressure gas cylinder, and relates to the technical field of high-pressure containers. The high-pressure gas cylinder applied to the liquid nitrogen environment comprises a high-pressure gas cylinder body and a coating layer coating the outer surface of the high-pressure gas cylinder body, the shell wall of the high-pressure gas cylinder body sequentially comprises a metal lining cylinder and a composite material layer from inside to outside, the coating layer and the composite material layer are bonded through low-temperature epoxy glue, and the metal lining cylinder is made of a metal material. The metal lining bottle is formed by bonding alloy metal powder and a chelating agent at high temperature. 3D printing is adopted for the metal lining bottle, and spiral winding and annular winding are adopted for the composite material layer. By means of the design, the safety performance and stability of the gas cylinder in the liquid nitrogen environment can be effectively improved, meanwhile, the weight of the gas cylinder can be reduced, the service life of the gas cylinder is prolonged, and the high engineering application value is achieved.

The utility model relates to a single -arm type self -service sell coffee beverage machine's control structure belongs to coffee beverage vending machine technical field, including vending machine cabinet, vending machine cabinet front end is equipped with the meal outlet and the order screen, vending machine cabinet inside is equipped with the cup and cover falling ware located in vending machine cabinet one side, and the cup and cover falling ware are used for automatic provision cup and cover. Vending machine cabinet other side is equipped with the coffee machine, the coffee machine with the syrup machine between cup and cover falling ware, vending machine cabinet front end is equipped with the mechanical arm that takes the cup from cup and cover falling ware place and then stops syrup machine or coffee machine lastly will be equipped with coffee or beverage's cup and cover and send to the meal outlet. Have efficient convenient, space optimization, running stability is good and quality guarantee's characteristics. Realized efficient, accurate coffee and beverage production, simultaneously have good user interactive experience and running stability, be suitable for in commercial circle, office area etc. scene wide application.

The present invention discloses a PPC film and a preparation method for preparing TEM samples by dry method point transfer. By using a special PPC film, the target material is non-destructively transferred to a copper mesh to complete the preparation of the TEM sample, avoiding the problems of random distribution of the target sample, large material damage, and inability to transfer water-prone oxygen samples in wet transfer, thereby achieving efficient and reliable preparation of high-quality TEM samples. By using the physical properties of PPC, with the assistance of a micro-area transfer platform, the target sample can be precisely operated in a micro-area at a fixed point. This new method does not require the use of strong acids and alkalis for corrosion, and the material and carbon film will not be damaged during the transfer process. The process is suitable for different types of materials, including thin film materials, two-dimensional materials, nanowires, etc. The advantages of the present invention are precise point transfer, no water contact, little sample damage, little organic residue, wide application, low cost, high efficiency, and high success rate.

The invention relates to the technical field of medical instruments and traditional Chinese medicine physiotherapy equipment, and provides a splicable multifunctional automatic moxa cone forming device which comprises a base, limiting rods are fixedly connected to the four corners of the top of the base, a top plate is arranged at the top of the base, and a plurality of top rods are fixedly connected to the top of the top plate; handles are fixedly connected to the two sides of the top plate, and the top plate is in sliding connection with the limiting columns; and the mold modules are arranged in a superposing manner, circular truncated cone grooves which are uniformly distributed are formed in each module, and moxa cones with different shapes and sizes can be combined by superposing the modules. The automatic moxa cone manufacturing process is achieved, a large amount of manual intervention is not needed from moxa floss filling to extrusion forming to moxa cone ejection, the manufacturing efficiency is greatly improved, the labor cost is reduced, the requirement for a large number of clinical moxa cones can be met, and large-scale application of moxibustion therapy can be promoted.

The utility model discloses a saw cutting rotating device which comprises a motor sliding table, a driving mechanism arranged on the motor sliding table and an adjusting mechanism arranged on the motor sliding table. The driving mechanism comprises a servo motor mounting plate fixedly connected to the motor sliding table, a power assembly arranged on the servo motor mounting plate and a guide assembly arranged at the bottom of the motor sliding table, and the adjusting mechanism comprises a rotating seat fixedly connected to the upper surface of the motor sliding table; a second servo motor and a second planetary reducer are precisely rotated and positioned to drive a spindle motor supporting plate to rotate, so that a saw blade body rotates and stays at a correct position, precision machining and manufacturing are achieved, good accuracy and stability are achieved, cutting at various angles can be conveniently and precisely achieved, and production efficiency is improved. And meanwhile, the servo speed reducer and the planetary speed reducer can keep good stability during high-speed transmission, impact vibration is reduced, the cutting quality is improved, and meanwhile the service life of the device is prolonged.

The invention discloses an indole alkaloid compound as well as a preparation method and application thereof. Belongs to the technical field of microbial pesticides. The invention provides a molecular structure of an indole alkaloid compound, a preparation related microorganism and a preparation method of the indole alkaloid compound. According to the indole alkaloid compound provided by the invention, the structural characteristics such as a structural framework and a ring forming mode are different from those of known indole alkaloid compounds. The related indole alkaloid compound is produced by fermenting a strain Aspergillus japonicus TE-739D, and is easy to carry out large-scale fermentation production; the preparation method provided by the invention can be used for rapidly and accurately preparing the indole alkaloid compound. It is found for the first time that the indole alkaloid compound has bacteriostatic activity on drug-resistant botrytis cinerea, can significantly inhibit the growth of the drug-resistant botrytis cinerea, and can be used as a lead compound or a novel biopesticide component for inhibiting the drug-resistant botrytis cinerea.

An in-situ surface enhanced Raman spectroscopy system for real-time monitoring of the electrocatalytic three-phase interface belongs to the field of electrocatalytic characterization, and can realize accurate and convenient observation of the changes of the three-phase interface during the electrocatalytic reaction, and explore the deep mechanism of the reaction. It includes a Raman spectrometer, a peristaltic pump, an in-situ flow cell, an electrolyte bottle, a gas bottle, an electrochemical workstation and a data recording computer. The in-situ flow cell, the peristaltic pump and the electrolyte bottle are connected with a rubber tube to realize the circulation of electrolyte, the in-situ flow cell is connected to the gas bottle to pass the gas, and the electrode clamps of the electrochemical workstation are respectively clamped on the three electrodes of the in-situ flow cell. During the test, the in-situ flow cell is placed under the Raman spectrometer laser, and the test parameters are adjusted and the data is recorded by the computer. The present invention provides a simple and effective platform for exploring the path and mechanism of electrocatalytic reactions.

This application discloses a method for 3D printing aluminum alloy bearing cages, belonging to the field of cage production technology. The method includes the following steps: (1) preparing a matrix powder; (2) pretreating untreated SiC nanoparticles with nickel-phosphorus plating to obtain SiC nanoparticles coated with an average layer thickness of 60-100 nm nickel-phosphorus layer, mixing them evenly with the obtained matrix powder to obtain a powder, and then using laser powder bed 3D printing to perform layer-by-layer printing to obtain a preliminary blank; (3) heat-treating the preliminary blank to obtain the aluminum alloy cage. The aluminum alloy bearing cage prepared by adding SiC nanoparticles and using laser powder bed 3D printing has high hardness and good wear resistance, which not only extends the service life of the cage but also enables rapid short-term production of the cage.

The utility model provides a kind of process tool for ore chute production, including frame body, the frame body upper is equipped with cambered surface plate, frame body is equipped with annular rim for positioning chute apron around the position of cambered surface plate, the annular rim includes two end rims and two arc side edges, side edge is coaxially arranged with cambered surface plate;Multiple groups of main inspection holes for checking the degree of fit are equipped with on the cambered surface plate, main inspection hole corresponds with chute apron plug welding hole, inner lining high-strength wear plate and outer layer low carbon steel apron can be welded as a whole structure by plug welding hole, side inspection hole and hoisting groove are equipped on the side edge, multiple are interval arranged along the length direction of side edge in the side inspection hole, the hoisting groove is interval arranged at least two. A kind of process tool for ore chute production described in the utility model can be used for the production of ore chute with circular cross section, which is conducive to improving the production assembly quality of ore chute and improving production efficiency.

This disclosure relates to a method, apparatus, and luminescent product for forming a luminescent pattern. The method includes acquiring a printing task for a pattern to be printed, determining the target RGB channel values ​​of each pixel in the pattern to be printed, converting the target RGB channel values ​​of each pixel to obtain target CMYK channel values ​​of each pixel in the target color mode according to the target conversion relationship between the target color mode and the RGB color mode, and controlling a target printing machine to print a target pattern corresponding to the pattern to be printed based on the target CMYK channel values ​​of each pixel. This disclosure enables precise manufacturing of luminescent patterns, simplifies the process, and significantly reduces production costs.

The invention provides a TPU vamp production process and a TPU vamp, and relates to the technical field of vamp production. The TPU vamp production technology comprises the following steps that water-soluble cloth is prepared to serve as a bottom layer substrate, water-soluble lines serve as limiting lines, and TPU lines are used for laying surface layer decoration patterns; tPU threads are laid on the surface layer according to design requirements to form various modeling patterns, and in the laying process, the TPU threads are laid while the TPU threads are fixed to the bottom-layer water-soluble cloth through limiting threads in an electrical embroidery mode; performing hot-pressing shaping on the vamp on which the TPU threads are laid, so that the TPU threads are mutually fixed to form a stable modeling pattern decorative surface; and soaking the hot-pressed and shaped vamp in normal-temperature water to dissolve the water-soluble cloth at the bottom layer and the water-soluble threads of the limiting lines, thereby obtaining the TPU vamp with only the surface layer left. The water-soluble cloth and the water-soluble thread are used as the bottom layer and the limiting thread and can be easily dissolved and removed after the production process is finished, the subsequent treatment process of the vamp is simplified, and the production efficiency is improved.

The invention discloses a 3D printer for printing an ice structure and a printing method of the 3D printer, and relates to the field of 3D printing. The printing head assembly comprises a mounting seat, a printing spray head, a water supply assembly, a spray head cooling assembly and a spray material cooling assembly, wherein the printing spray head is mounted on the mounting seat; the nozzle cooling assembly is installed on the outer side wall of the printing nozzle. The material spraying and cooling assembly is installed on the installation base, and the discharging end of the material spraying and cooling assembly corresponds to the discharging end of the printing nozzle. When the printer is used for manufacturing structures such as ice sculptures and ice houses, materials are convenient to take, liquid water can be directly used as raw materials, and the water is conveyed into the printing spray head through the water supply assembly, rapidly cooled to be below the freezing point from the normal temperature and sprayed out under the action of the spray head cooling assembly; and the sprayed water layer and ice crystals are rapidly condensed on the ice layer below under the action of the spraying cooling assembly, so that the firmness of connection between the ice layers can be enhanced during layer-by-layer printing, interlayer flowing is prevented, the manufacturing efficiency of the ice structure is improved, and the manufacturing precision of the ice structure can be ensured.

The utility model relates to the technical field of medicament stirring, and discloses a quick medicament stirring device which comprises a base and a material storage assembly, a stirring barrel is arranged at the top of the base, the material storage assembly is arranged at the top of the stirring barrel, a crushing assembly is arranged at the bottom of the inner side of the material storage assembly, and a stirring assembly is arranged in the stirring barrel. A water injection opening is formed in the top of the stirring barrel through a formed groove. The device is composed of the material storage assembly and the crushing assembly, a material storage tank is placed through a material storage box of the material storage assembly, medicines in the material storage tank can be weighed through a metering scale, and added water is metered through a metering pump, so that the medicines are accurately prepared, and the medicine effect of the medicines is improved; medicine in the discharging tank can be prevented from going bad through drying cotton, a storage box can be sealed through a storage cover, the medicine in the discharging tank is prevented from going bad after being exposed in air for a long time, a motor A of the crushing assembly drives a connecting shaft to rotate, a crushing blade crushes the medicine, and dissolution of the medicine can be accelerated.

The utility model discloses cylindrical mirror drawing equipment, relates to a manufacturing technology of optical glass products, and in particular relates to drawing equipment for continuously producing high-precision cylindrical mirrors. Comprising a rod feeding unit (1), a heating unit (2), a diameter measuring unit (3), a traction unit (4), a cutting unit (5), a vertical tower (6), a gas control unit (7), an electrical control unit (8) and a master control operation station (9). A rod feeding unit (1), a heating unit (2), a diameter measuring unit (3), a traction unit (4) and a cutting unit (5) are sequentially arranged on the front face of a vertical tower (6) from top to bottom, a gas control unit (7) and an electrical control unit (8) are arranged on the side face of the vertical tower (6), and a master control operation station (9) is arranged beside the vertical tower (6). By optimizing process parameters of heating, stretching, cooling and the like, efficient and continuous production of the cylindrical mirror is realized, and the cylindrical mirror production device has the characteristics of high production efficiency, low cost and good size consistency.

The invention provides a special-shaped sleeve for local repairing of a plugging tee joint, a mold and a manufacturing and repairing method. The manufacturing method of the special-shaped sleeve for local repairing of the blocking tee joint comprises the steps that S1, the blocking tee joint to be repaired is scanned, and the outer contour and contour parameters of the blocking tee joint to be repaired are obtained; s2, the outer contour of the to-be-repaired and blocked tee joint is amplified, and the gap between the amplified outer contour of the to-be-repaired and blocked tee joint and the outer contour of the to-be-repaired and blocked tee joint is made to be a preset value; s3, the amplified outer contour of the to-be-repaired blocking tee joint serves as the inner wall contour of a to-be-machined mold to manufacture the to-be-machined mold, and the to-be-machined mold is divided into a left mold body and a right mold body; and S4, the two steel plates are subjected to hot press molding through a left mold and a right mold correspondingly, and a left special-shaped sleeve and a right special-shaped sleeve matched with the plugging tee joint to be repaired are manufactured.

The ultrasonic additive and subtractive integrated manufacturing equipment comprises a main frame, a main shaft, an additive structure, a subtractive structure and a control module, the main shaft is vertically installed on one side of the main frame, the subtractive structure is installed on the main shaft and can move up and down along the main shaft, and the additive structure is installed on the right side of the main shaft; a workbench capable of moving in the x-axis direction and the y-axis direction is arranged on the upper surface of the main frame. The material adding structure comprises a cutting unit, a foil feeding unit and an ultrasonic welding unit, the cutting unit is used for cutting a foil strip, and the foil feeding unit is used for continuously providing a metal or non-metal foil strip for the ultrasonic welding unit; the subtractive structure comprises a milling tool, and the control module is used for receiving the part three-dimensional model and controlling the additive structure and the subtractive structure to work. According to the method, complex metal parts can be efficiently and accurately manufactured, the advantages of ultrasonic additive manufacturing and subtractive machining are fully played, and the limitation of a traditional manufacturing process is overcome.

The application discloses a quantum state preparation method and system based on LimTDD and electronic equipment, and relates to the technical field of quantum state preparation. The method comprises the following steps: obtaining target LimTDD corresponding to classical data in a preset technical field; generating a first target quantum circuit for converting the target LimTDD into a new target LimTDD, wherein the quantum state of the new target LimTDD is; processing the first target quantum circuit to obtain the quantum state corresponding to the classical data. The application can more accurately prepare the quantum state corresponding to the classical data, effectively improve the preparation efficiency of the quantum state, and has strong scalability.

The invention discloses a contrast agent macro preparation system, a contrast agent macro preparation method and a controller. The system comprises a synthesis module and a purification module, the synthesis module comprises an activation unit, at least one reaction unit and at least one swelling unit, the activation unit is used for modifying the surface of a carrier microsphere to obtain a modified carrier microsphere, the reaction unit is used for synthesizing a first intermediate product, and the swelling unit is used for swelling the first intermediate product; the swelling unit is used for mixing and reacting the modified carrier microspheres and the first intermediate product in a swelling agent and then adding a shrinking agent to obtain a contrast agent crude product; the purification module comprises a chromatographic column and is used for separating and purifying the contrast agent crude product to obtain a contrast agent target product. By automatically controlling the synthesis module and the purification module, the whole reaction process is controllable, contrast agents containing different types of elements can be rapidly, efficiently and accurately prepared in a large scale, and the requirement for macro preparation of different contrast agents is met.

The invention relates to the technical field of cement electric pole production, in particular to an internal cavity supporting and collapse preventing structure for cement electric pole production and a manufacturing method. The internal cavity supporting and collapse preventing structure comprises a plurality of twisted steel bars, a plurality of bases correspondingly connected with the ends of the twisted steel bars in a sleeving mode and a plurality of iron bars alternately penetrating and winding in gaps of the twisted steel bars in an up-down fluctuating mode; each base is of an equal-arc block structure of a whole circular ring, an insertion hole is formed in the middle of the side face of each base, the threaded steel bars are inserted into the insertion holes, a clamping ring is arranged at one arc end of each base, a clamping ring is arranged at the other arc end of each base, and the multiple bases are rotationally connected end to end through corresponding clamping connection of the clamping rings and the clamping rings. According to the invention, the plurality of iron bars are alternately wound in the gaps of the plurality of twisted steel bars, and the iron bars at different positions are arranged to jointly cooperatively wind and wrap the twisted steel bars through fluctuating position change, so that a more compact and uniform reinforcement cage structure is formed, and the overall stability and strength of the reinforcement cage structure are enhanced; and collapse or deformation of the reinforcement cage in the cement pouring process is effectively prevented.

This invention provides a pressure detection system, control method, and vehicle for an EGR valve, relating to the field of vehicle technology. The EGR valve pressure detection system includes a pressure measuring device, a first air pipe, a second air pipe, and a cleaning device. The pressure measuring device includes an inner cavity and a detection unit disposed within the inner cavity. The inner cavity is connected to the inlet and outlet ends of the EGR valve via the first and second air pipes, respectively. The detection unit is used to detect the pressure in the first and second air pipes within the inner cavity. The cleaning device is connected to the inner cavity and is used to clean the inner cavity with gas. The beneficial effect of this invention is that it can reduce the margin in the EGR rate calibration, thereby improving engine thermal efficiency.

The invention relates to the technical field of batteries, particularly provides a positive electrode material and a preparation method thereof, and a preparation method of a CuCo double-monatomic material, and aims to solve the problem that the performance of an existing lithium-sulfur battery is degraded due to the shuttle effect of polysulfide. Therefore, a CuCo double-monatomic material included in the positive electrode material is prepared by the following steps: step 1, mixing inorganic salt and a copper metal organic framework material, and carrying out first heating reaction to obtain a Cu monatomic material; and 2, mixing the Cu monatomic material, a cobalt source and a solvent to obtain a second mixed solution, drying the second mixed solution, and then carrying out second heating treatment to obtain the CuCo dimonatomic material. By adding the CuCo double-monatomic material, active sites in the positive electrode can be increased, and the synergistic effect of the double-monatomic sites in the CuCo double-monatomic material can enhance the interaction between the active sites and polysulfide, so that the electrochemical performance of the lithium-sulfur battery is improved.