310results about How to "Improve purity" patented technology

The invention discloses a glucometer high-precision detection method based on a dynamic calibration algorithm and a glucometer, and relates to the field of blood glucose detection.The method comprises the steps that modal decomposition is conducted on a blood glucose current signal, the blood glucose current signal is decomposed into a plurality of frequency components, and an effective physiological component and an interference component are separated from the frequency components; performing time sequence feature extraction on the effective physiological component to obtain feature parameters at multiple moments, and performing correlation analysis on the feature parameters at the multiple moments, the environment temperature and the tissue impedance parameter to obtain a fusion feature vector; inputting the fusion feature vector into a parameter calibration model, and outputting a preliminary blood glucose value; a temperature correction coefficient is calculated according to the deviation between the environment temperature and the preset reference temperature, the initial blood glucose value is dynamically adjusted according to the temperature correction coefficient, and a final blood glucose detection value is obtained. By implementing the method, the detection accuracy of the glucometer can be improved.

The invention belongs to the technical field of bar production, and particularly relates to a production method of a steel bar for a heavy-load automobile half axle, and the steel bar comprises the following chemical components in percentage by mass: 0.39-0.42% of C, 0.25-0.35% of Si, 1.45-1.70% of Mn, less than or equal to 0.013% of P, less than or equal to 0.006% of S, less than or equal to 0.25% of Cr, less than or equal to 0.25% of Ni, 0.15-0.20% of Mo, 0.06-0.10% of V, less than or equal to 0.15% of Cu and the balance of Fe and inevitable impurities. The method has the advantages that high-performance, high-purity and low-cost production of the steel bar for the heavy-duty automobile half shaft is realized through green short-process production of'ecological electric furnace + LF + RH + continuous casting 'in combination with low-carbon component design and a controlled rolling and controlled cooling process. And macrostructures and non-metallic inclusions of the finished steel meet the requirements of high-end products.

The invention discloses an underwater target detection method based on differential attention. The method comprises the following steps: acquiring an underwater image to be detected; based on the underwater image data set, constructing a lightweight underwater target detection network model based on a differential attention mechanism; constructing a joint loss function, and performing end-to-end training on the lightweight underwater target detection network model to obtain a trained lightweight underwater target detection network model; performing mathematical equivalence fusion on the lightweight underwater target detection network model to generate a lightweight reasoning model; and inputting the obtained underwater image to be detected into the lightweight reasoning model to realize target detection of the underwater image. According to the method, a differential attention feature interaction mechanism is introduced, common-mode noise is stripped through differential calculation, and the detection precision and real-time performance of an underwater fuzzy scene and a tiny target are remarkably improved in combination with a feature pyramid network integrating dynamic scale perception and semantic gating.

The invention relates to the technical field of ferrous metallurgy casting, in particular to a drainage sand removing and recycling method and device. Comprising a mechanical arm, a lifting rotation controller, a controller arm, a sand suction cylinder, a sand conveying pipeline, a sand collecting tank and an injection pump. The lifting and rotating controller is fixedly mounted on the mechanical arm; the controller arm is connected with the lifting and rotating controller, and the lifting and rotating of the controller arm are controlled by the lifting and rotating controller; the sand suction cylinder is connected with the controller arm, the sand suction cylinder is of a U-shaped structure, and one end of the sand suction cylinder is a horn mouth used for sucking drainage sand; one end of the sand conveying pipeline is positioned above the tundish cover sprue gate, and the end part of the sand conveying pipeline is bent downwards to be connected with the other end of the sand suction cylinder; the other end of the sand conveying pipeline is connected with the sand collecting tank; the sand collecting tank is connected with an injection pump pipeline, and the injection pump provides suction power. The ladle filler sand, harmful gas in gaps of the ladle filler sand and a long nozzle and a small part of molten steel in contact with the ladle filler sand in a steel ladle can be discharged out of tundish molten steel and recycled.

This utility model relates to the field of crushing device technology, specifically disclosing a crushing device for recovering coated sand, including a base, a crushing cylinder fixedly installed on the top of the base, a feeding channel fixedly connected to the top of the crushing cylinder, a rotating rod rotatably arranged inside the crushing cylinder, a uniformly distributed and symmetrically arranged cutting blade fixedly installed on the rotating rod, an arc-shaped filter plate arranged on the bottom surface of the crushing cylinder, a conveying channel fixedly connected to the bottom surface of the crushing cylinder at a point on the arc-shaped filter plate, a bottom cylinder fixedly connected to the bottom of the conveying channel, a movable disc rotatably arranged inside the bottom cylinder, a rotating rod 2 arranged inside the bottom cylinder, the rotating rod 2 arranged on the movable disc, a distributed and symmetrically arranged movable column fixedly installed on the rotating rod 2, and a magnetic column arranged inside the movable column. This crushing device for recovering coated sand can directly adsorb metal impurities in the crushed coated sand, improving the purity of the recovered coated sand and having strong practicality.

The invention relates to the technical field of tobacco plant identification and counting, and discloses an unmanned aerial vehicle tobacco plant identification and counting method and system based on improved deep learning, which combines technologies of image classification, image segmentation, feature point extraction, machine learning, target detection and the like with refined intelligent identification of tobacco. According to the method, high-precision image recognition and analysis are realized by utilizing the efficient feature extraction and calculation capability of the method, point plant counting can be accurately performed, the efficiency and precision of agricultural production are greatly improved, the problem of calculation complexity of a traditional method in large-scale high-resolution image processing is solved, and powerful technical support is provided for precision agriculture. Therefore, the invention provides an unmanned aerial vehicle tobacco plant identification and counting method based on improved deep learning target detection and multi-dimensional post-processing, and high-precision and robust detection and counting of tobacco plants in large-scale tobacco field orthoimages are realized by constructing a three-stage assembly line of image preprocessing, improved target detection and multi-dimensional post-processing.

The invention relates to the technical field of casting equipment, and particularly discloses a molding sand treatment device for casting a tractor saddle support, which comprises a rack, a coarse sieve plate is arranged at the upper part of the rack, a screening mechanism and a cleaning mechanism are further arranged on the rack, the screening mechanism comprises a fine sieve plate, a crushing plate and an adsorption assembly, and the fine sieve plate is obliquely arranged below the coarse sieve plate; the crushing plate is obliquely suspended above the fine screen plate, a wedge-shaped crushing gap is formed between the crushing plate and the fine screen plate, the caking molding sand can be rubbed and crushed through reciprocating movement of the crushing plate, the adsorption assembly comprises a plurality of magnetic mounting plates arranged below the fine screen plate, and the cleaning mechanism comprises a scraper blade and a collecting box. The collecting box can push the vertically drooping mounting plate to turn over to a cleaning state, the scraping plate scrapes and sweeps the surface of the turned mounting plate, and the collecting box moves along with the scraping plate and collects scraped scrap iron; according to the invention, screening, crushing and iron removal operations in a non-stop state are realized, and the production efficiency is greatly improved.

The utility model relates to the technical field of scrap copper treatment equipment, and discloses scrap copper treatment equipment convenient to use, which comprises a crushing mechanism, the lower end of the crushing mechanism is connected with a classification mechanism, the classification mechanism comprises a water tank, and an air pump is fixedly arranged in the middle of one side of the water tank. The output end of the air pump penetrates through the bottom of one side of the water tank to extend into the water tank and is fixedly connected with a through pipe, four air pipes are fixedly connected to a pipe body of the through pipe, a plurality of rubber valves are fixedly arranged on pipe bodies of the four air pipes, and a plurality of holes are formed in the inner bottom face of the water tank. The multiple rubber valves are correspondingly and fixedly arranged in the multiple holes respectively, and a water outlet is formed in the other side of the water tank. According to the scrap copper crushing device, the crushing roller is driven by the motor to extrude and crush scrap copper, and meanwhile, impurities attached to the surface of the scrap copper are effectively removed by utilizing bubbles generated by the air pump and under the scouring action of the bubbles in water, so that the purity of copper materials is improved.

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

This invention discloses a preform for the hot top of a crystallizer specifically for semi-continuous casting of aluminum-lithium alloys and its manufacturing method. Addressing the problems of severe interfacial reactions between existing refractory materials and molten aluminum-lithium alloys, resulting in poor forming quality of semi-continuous casting ingots, this invention employs a gradient composite structure design: lithium aluminate is introduced into the working layer to thermodynamically suppress interfacial reactions by increasing the intrinsic lithium chemical sites; the insulation layer contains β-lithium nepheline and lithium aluminate to improve the insulation performance and thermal shock resistance of the hot top. Furthermore, by using a gradient distribution of lithium compound concentrations and types, combined with a multi-stage sintering process, the interlayer bonding strength is improved. Results show that this invention not only significantly reduces the interfacial reaction between the molten aluminum-lithium alloy and the hot top during semi-continuous casting, improving the forming quality of aluminum-lithium alloy ingots, but also extends the service life of the preform.

This invention relates to the field of artificial intelligence visual inspection technology, and discloses an artificial intelligence visual inspection method, system, and storage medium. The method includes: establishing a spatiotemporal field composed of sequential image frames; constructing dynamic behavioral trajectories of pixels within the spatiotemporal field, analyzing their fluctuation and propagation patterns to form evolutionary features; calculating a correlation matrix based on the evolutionary features, identifying pixel clusters, and performing multi-level feature decoupling to separate stable and transient feature layers; performing topological weaving on the stable feature layers to form a feature topology network and extracting structural invariants; using topological rules defined by the structural invariants to constrain the generative network and construct an enhanced feature expression layer; and fusing and projecting the enhanced features with the original image after removing the transient layer to generate a visual inspection image for surface state discrimination. This invention can separate the essential attributes of objects from environmental interference, and improves the accuracy and robustness of detection through feature enhancement guided by topological rules.

The invention relates to the field of metal materials and petroleum machinery, in particular to VBRE low-carbon low-alloy steel for a pressure-bearing part of an ultra-deep well blowout preventer group and a preparation method of the VBRE low-carbon low-alloy steel. The steel comprises the following chemical components in percentage by weight: 0.05 to 0.15 percent of C, 0.05 to 0.35 percent of Si, 0.40 to 0.80 percent of Mn, 2.0 to 3.0 percent of Cr, 0.80 to 1.20 percent of Mo, 0.05 to 0.25 percent of V, 0.0005 to 0.0030 percent of B, 0.0020 to 0.030 percent of RE and the balance of Fe. A series of key technologies such as purification smelting, high-purity rare earth treatment, argon protection pouring, cast ingot high-temperature demolding, high-temperature diffusion annealing, homogeneous forging forming and thermal refining are adopted, and the defects of internal component segregation, shrinkage cavity and porosity, non-metallic inclusion, uneven tissue, unstable performance and the like of the ultra-deep well blowout preventer set pressure-bearing part are greatly reduced; the VBRE low-carbon low-alloy steel for the pressure-bearing part of the blowout preventer group of the ultra-deep well, which has the characteristics of purity, homogeneity, compactness, refinement and the like and excellent obdurability matching, is obtained, and the service performance requirements of high strength, high toughness, heat resistance, corrosion resistance, fatigue resistance and the like are met.

The utility model relates to the technical field of millet winnowing, in particular to winnowing and screening integrated sorghum rice deslagging equipment which comprises a machine body, a screening mechanism, an air supply mechanism and a collecting mechanism, and the screening mechanism comprises a screen, a moving block, a rotating wheel and a motor; the multiple screens are arranged in the machine body in the radial direction. The moving blocks are arranged at the two ends of the screen and are in rigid connection with the screen, and moving grooves are formed in the moving blocks. The rotating wheels are arranged at the two ends of the screen, inserting rods are arranged on the rotating wheels, the rotating wheels at the two ends of the screen are rigidly connected through the inserting rods, and the inserting rods are inserted into the moving grooves. When the rotating wheel rotates, the screen is in a vibration state, and at the moment, the screen can screen the sorghum rice; the motor is used for driving the rotating wheels to rotate and arranged on the outer wall of the machine body and drives other rotating wheels to rotate through a transmission belt. The device reduces the equipment maintenance cost and the shutdown frequency, prolongs the service life, provides stable equipment support for large-scale sorghum rice deslagging operation, and enhances the toughness of an industrial processing chain.

This utility model relates to the field of capacitor electrolyte treatment technology and discloses a capacitor electrolyte purification and impurity removal device, including a storage tank for storing capacitor electrolyte, a flexible tube connected to the bottom of the storage tank, a tank body fixed to one side of the storage tank, and a tank cover connected to the top of the tank body by bolts; a stirring assembly for stirring the electrolyte is provided on the top of the storage tank; a filter screen is provided inside the tank body for removing impurities from the electrolyte. By setting the stirring assembly on the top of the storage tank, the rotating shaft is driven by a motor to drive the stirring blades to fully stir the electrolyte, effectively preventing the electrolyte from settling or separating, thereby improving the uniformity of the electrolyte. By setting the filter screen inside the tank body, after the electrolyte enters the tank body, it passes through the filter screen for impurity removal. Impurities are trapped on the filter screen, and the clean electrolyte is discharged through the outlet pipe, effectively removing solid impurities from the electrolyte and improving the purity of the electrolyte.

This invention discloses a method for preparing high-elongation bars for cold forging, belonging to the field of aluminum alloy preparation technology. Through optimization of composition and process, the prepared bars possess high purity, uniform and fine equiaxed grain structure, and excellent plasticity, with significantly improved elongation. This meets the stringent requirements of cold forging for high material plasticity, resulting in a bright, crack-free surface and uniform grains after cold forging, overcoming problems such as oxide scale, coarse grains, and poor dimensional accuracy caused by hot forging. Furthermore, the introduction of modified talc and sodium nitrate as refining agents further promotes uniform microstructure, achieving high elongation and excellent cold forging performance.

This utility model discloses a quantitative dispensing and packaging device for edible oil, relating to the field of edible oil packaging technology. It includes a base, with two mounting brackets fixedly connected to the upper surface of the base. An oil storage tank is fixedly connected to the upper surface of the two mounting brackets, and an oil inlet pipe is fixedly connected to the upper surface of the oil storage tank. A pump is mounted on the surface of the base, and a quantitative tank is mounted on the surface of the base. An oil drain pipe is fixedly connected to the side of the pump and the quantitative tank that are close to each other, and an oil outlet pipe is fixedly connected to the side of the oil storage tank that is close to the pump. Valves are provided on the surface of both the oil drain pipe and the oil outlet pipe. A dispensing head connected to the pump is mounted on the surface of the base. This utility model uses a rotating auger, scraper, gear ring, gear, stirring rod, and stirring blades to stir the edible oil in the oil storage tank, reducing the occurrence of stratification and sedimentation in the edible oil and improving the practicality of the edible oil dispensing and packaging device.

This invention relates to the field of gray cast iron material preparation technology, and particularly to a method for preparing multi-alloy synergistically strengthened gray cast iron, comprising: adding steel raw materials to a smelting apparatus and heating to form molten iron; adding a chromium alloy to the molten iron, heating and holding at that temperature to form a basic mixture; determining the degree of furnace lining peeling based on the vibration frequency of the smelting apparatus, and determining the overheating risk level of the basic mixture based on the degree of furnace lining peeling; determining a target heating temperature based on the overheating risk level; determining the eddy current risk level based on the actual rotation speed; adjusting the stirring intensity during the smelting process based on the eddy current risk level; detecting the mixing ratio of the basic mixture and adjusting the amount of steel raw materials or the chromium alloy added to form a target solution; and simultaneously adding manganese nitride, alloyed tin, and ferrous sulfide to the target solution in a specified ratio to form multi-alloy synergistically strengthened gray cast iron. This invention improves the strength, toughness, fluidity, and resistance to solidification defects of gray cast iron.

The invention relates to the field of glass, in particular to ultrathin flexible cover plate glass as well as a preparation method and application thereof. The glass is composed of 10-30% of UTG cullet and 70-90% of a specific batch and contains SiO2, Al2O3, Na2O and the like, and the decolorizing agent is prepared by compounding NaNO3 and K2O according to the ratio of 1: 0.2-1: 1. The preparation method comprises the following steps: adding cullet at 1000 DEG C and 1200 DEG C in two stages, carrying out heat preservation and homogenization at 1200-1300 DEG C for 30-60 minutes, and carrying out melting clarification at 1500-1600 DEG C and temperature-controlled annealing. The thickness of the obtained glass is 30-70 microns, the surface pressure stress after chemical strengthening is larger than or equal to 680 MPa, and the bending radius is smaller than or equal to 1.8 mm. According to the method, by means of collaborative design of components and the process, high performance is guaranteed, waste recycling is achieved at the same time, and the method is suitable for folding mobile phones, flexible OLEDs and other devices.

This invention belongs to the field of rail vehicle technology. It proposes a method and system for adjusting the alignment of workpieces during the intermediate stage of bogie welding. Based on the design 3D model of the bogie workpiece and the process scaling requirements, key dimensions are selected and adjusted to construct a virtual intermediate model. Feature points are collected from the key feature surfaces of the virtual intermediate model to obtain reference values ​​for each feature point. A 3D scan of the actual bogie workpiece during the intermediate welding stage is performed to acquire point cloud data. Feature points are collected and processed from the corresponding key feature surfaces of the point cloud data to obtain the actual values ​​of each feature point. By comparing the reference values ​​and actual values ​​of each feature point, the deviation of each feature point is obtained. For the key dimensions of the bogie workpiece, a scribing weight mechanism is introduced to assign weight priorities to each key dimension. Based on the deviation of each feature point and the weight priorities, the position of the baseline of the key feature surface is adjusted. This invention achieves a closed-loop process from model adaptation and data comparison to baseline adjustment.

The utility model belongs to the technical field of powder cleaning machine, especially 3D printing's aircraft rudder shaft polishing powder recovery device, including powder cleaning machine body, the bottom of powder cleaning machine body is provided with recovery mechanism, recovery mechanism includes filter screen, the aperture structure of filter screen is filtered to the powder that falls because of gravity, passes through setting dust extraction mechanism, detects the powder concentration in air, support frame and electric push rod fixed mounting, to its fixed, the telescopic of electric push rod can drive dust extraction frame to remove to adjust the relative distance between the rotator device of workpiece and placement, dust extraction frame adopts half ring structure, its inner diameter is slightly greater than the outer diameter of rotator device, ensures that the floating powder that workpiece produces when rotating and vibrating can be effectively absorbed.

The invention relates to a preparation method of high-purity and high-toughness hot work die steel, which comprises the following steps: S1, electric furnace smelting; s2, refining in a ladle refining furnace; s3, refining in a vacuum refining furnace; s4, performing die casting on an electrode blank; s5, annealing the electrode blank; 6, electroslag remelting is conducted, specifically, an electrode blank is adopted, surface polishing is conducted, a calcium fluoride, aluminum oxide, magnesium oxide and silicon dioxide quaternary slag system is adopted for smelting, the starting point melting speed value of the electroslag smelting steady-state stage is 7-10 kg / min, the end point melting speed value of the electroslag smelting steady-state stage is 5.0-8.0 kg / min, an electroslag ingot is obtained, and then power-off furnace cooling is conducted for 80-100 min; s7, forging is conducted; s8, pretreatment after forging; and S9, solid solution and spheroidizing final treatment. According to the invention, on the basis of common hot work die steel H13, the prepared product has excellent high hardness, high purity and high toughness through fine adjustment of chemical components and special smelting, forging and heat treatment processes. The anti-cracking performance of a mold made of the material is greatly improved, the service life of the mold is prolonged, and meanwhile the use cost of the mold is greatly reduced.

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 invention relates to the technical field of welding devices, and particularly discloses a fresh air pipeline welding device for old community reconstruction, which comprises a placing base, a height adjusting device is fixedly connected to the top of the placing base, and first sliding sleeves are fixedly connected to the parts, positioned on two sides of the height adjusting device, of the top of the placing base; the fresh air pipeline welding device comprises a U-shaped connecting support, a first sliding sleeve is fixedly connected to the top of the U-shaped connecting support, a first sliding rod is slidably connected to the inner wall of the first sliding sleeve, an angle adjusting device is fixedly connected to the top of the U-shaped connecting support, a welding gun is fixedly connected to one side of the angle adjusting device, and clamping and fixing devices are fixedly connected to the top and the bottom of the U-shaped connecting support. The height adjusting device is arranged, so that fresh air pipelines of any height can be welded, the clamping and fixing device is arranged, so that two sets of pipelines needing to be welded can be clamped and fixed at the same time, and the problem of welding deviation caused by sliding due to unstable clamping is avoided.

This invention discloses a low-pressure casting and heat treatment process for high-strength and high-toughness aluminum alloy used in contact wire ratchet, belonging to the field of rail transit component manufacturing technology. The process uses AlSi7Mg0.3 alloy, obtaining high-purity aluminum liquid through two refining and modification treatments. In the low-pressure casting stage, a three-stage pressure control is adopted: the first stage is the liquid-raising stage, the second stage is the mold-filling stage, the third stage is the pressure-increasing and shrinkage-compensating stage, and finally, pressure holding and cooling are performed; followed by T6 heat treatment. This invention solves the casting problems of easy air entrapment in ratchet teeth and easy shrinkage porosity in the hub. The casting has a tensile strength ≥275MPa and a breaking load ≥94.5kN, meeting the requirements for a 2×10 contact wire ratchet. 5 Secondary fatigue load requirements.

This invention discloses a highly corrosion- and weather-resistant silicate glass material and its preparation method, comprising the following components by weight: 60-80 parts of a main network component, which forms a silicon-oxygen network framework after melting; 5-15 parts of a network-modifying component, which is distributed within the silicon-oxygen network framework; 5-12 parts of a lattice-stabilizing component; 2-8 parts of a compacting reinforcing component; and 3-10 parts of a lattice-strengthening component, which are dispersed within the silicon-oxygen network framework to form a dense silicate glass matrix. This invention can improve the weathering resistance, groundwater erosion resistance, and long-term structural stability of the glass material, and enhance the internal purity and density of the glass matrix, meeting the needs of deep underground burial and long-term information preservation applications.

The utility model discloses a vehicle-mounted audio system based on a TBOX emergency call function, and the system comprises a vehicle-mounted information entertainment system module which is provided with a central logic control unit, an A2B main controller, a first A2B bus physical switch, and a second A2B bus physical switch; the audio power amplifier module is provided with an AMP MCU and a mute driving module, and the AMP MCU receives a mute instruction from the vehicle-mounted communication terminal module through a CAN bus and / or a hard wire; and the vehicle-mounted communication terminal module is provided with a cellular communication module and a microphone module and can send an emergency trigger signal to the vehicle-mounted information entertainment system module through a hard wire. In an emergency mode, the vehicle-mounted information entertainment system module can disconnect an A2B link, the vehicle-mounted communication terminal module establishes an emergency call and actively commands the audio power amplifier module to be mute through a redundant path, and it is ensured that the call at a driving position is clear. And through multiple isolation and redundancy control, the audio quality of emergency calls and the reliability of the system are effectively guaranteed when the system fails.

The utility model relates to the field of nitrogen making machines, in particular to an efficient molecular sieve adsorption type nitrogen making machine. The device comprises a reaction cylinder, and an inner cylinder is fixedly connected to the interior of the reaction cylinder. The conical filter plate in the treatment mechanism is in a big-end-down shape, impurities in gas can be effectively filtered out, the unique shape of the conical filter plate can guide the impurities to slide to the flow guide groove along the inclined face, then the impurities are collected in a centralized mode through the collecting cavity, the impurities are prevented from entering the inner cylinder to affect the performance of the molecular sieve, and the purity of gas treatment is guaranteed; the nitrogen generation efficiency and quality are improved; moreover, the driving motor drives the conical filter plate to rotate, so that the gas treatment efficiency and quality of the nitrogen making machine can be remarkably improved, the contact frequency of the surface of the conical filter plate and impurities in the gas is greatly increased in the rotating process, and the impurity intercepting effect is remarkably enhanced; and meanwhile, the impurities are promoted to move towards the edge of the filter plate and slide to the diversion trench along the inclined surface due to the centrifugal force.

The grinding device for detecting the oil content of the vegetable protein food comprises a main body, a running mechanism, an adjusting mechanism and an auxiliary assembly, the running mechanism comprises a rotating piece, a conveying piece, a fixed piece, a movable piece and a roller bearing, and the adjusting mechanism comprises a threaded sleeve, a first spring, a positioning frame and a feeding box. The auxiliary assembly comprises a second spring, a push plate, a material receiving box and a supporting rod, under the mutual cooperation effect of the mechanisms, the device can evenly feed a sample into the grinding cavity, fluctuation caused by manual adding is avoided, the sample is evenly stressed in the grinding process, the uniformity of grinding particles is improved, the subsequent grease extraction efficiency is improved, and in addition, the device is convenient to use. The device can be used for different samples or different experiment stages in the same equipment, the utilization rate of the equipment is increased, and the influence of different grinding granularities on results can be quickly tried at the stage of developing a detection method.

The utility model discloses a slender vehicle-mounted bass sound box. The sound box comprises a box body, a bass sounding unit and an echo tube, the box body comprises a top plate, side plates and a bottom plate, and a sound cavity enclosed by the top plate, the side plates and the bottom plate is formed in the box body; the top plate is provided with a first mounting hole communicated with the sound cavity, and the top plate or the side plate is provided with a second mounting hole communicated with the sound cavity; the bass sounding unit is mounted in the first mounting hole, the bass sounding unit is provided with a vibrating diaphragm, and the vibrating diaphragm limits a part of the boundary of the sound cavity; the echo tube extends into the sound cavity from the second mounting hole; the minimum distance E between the second mounting hole and the center of the diaphragm satisfies the following formula: Rd < = E < = 3.5 Rd, wherein Rd represents the radius of the diaphragm. According to the slender vehicle-mounted bass sound box, the bass strength, the diving depth and the bass purity and texture of the vehicle-mounted bass sound box are effectively improved on the premise that the volume of the sound box is kept moderate and the cost is controllable.