11results about How to "Effective size control" patented technology

The invention belongs to the technical field of tunnel supporting, and particularly relates to a yielding type constant-resistance energy absorption steel arch. The steel arch is formed by assembling a plurality of profile steel units and a plurality of constant-resistance yielding devices, and the constant-resistance yielding devices are arranged among the profile steel units; the constant-resistance yielding device comprises an outer supporting frame and an inner supporting frame, one end of the inner supporting frame extends into the outer supporting frame, the inner supporting frame moves in a guiding mode along the outer supporting frame, and constant-resistance friction structures are arranged on the mutual contact faces of the outer supporting frame and the inner supporting frame. A constant-resistance sleeve is arranged on one of the outer supporting frame and the inner supporting frame, an anchor cable is arranged on the other one of the outer supporting frame and the inner supporting frame, one end of the anchor cable penetrates into the constant-resistance sleeve, a constant-resistance sliding body is arranged on the portion, penetrating into the constant-resistance sleeve, of the anchor cable, and the constant-resistance sliding body slides in the constant-resistance sleeve in a guiding mode with constant resistance. The constant-resistance yielding device can play a dual constant-resistance yielding role, so that the steel arch can play a good supporting role on the basis of adapting to surrounding rock deformation, and the safety of a supporting system is improved.

The invention relates to the technical field of drawing recognition, and discloses an information recognition method and device of a vector drawing and a computer program product. The method comprises the following steps: acquiring a vector drawing, analyzing the vector drawing, and determining a plurality of labeled vector lines in the vector drawing; based on the attribute relationship of the plurality of labeled vector lines, clustering the plurality of labeled vector lines to generate a line cluster set; combining the plurality of vector lines in the line cluster set by utilizing the position relationship among the plurality of labeled vector lines to generate a labeled information box; and identifying characters in the annotation information box to obtain annotation information of the vector drawing. By implementing the technical scheme of the invention, the labeling information in the vector drawing can be effectively identified and extracted, and the automation and accuracy of drawing analysis are improved.

The invention discloses a supported catalyst for acidic oxygen evolution reaction as well as a preparation method and application of the supported catalyst. The supported catalyst comprises a MnO2 nanofiber carrier and noble metal and / or noble metal oxide loaded on the surface of the carrier. The preparation method of the supported catalyst comprises the following steps: (1) dispersing a manganese source, ammonium persulfate and potassium sulfate in a first solvent, and carrying out a heating reaction to obtain MnO2 nanofibers; and (2) uniformly mixing the MnO2 nanofibers with a noble metal source dispersion liquid and molten salt, drying to obtain mixed powder, and calcining the mixed powder in an inert atmosphere to obtain the supported catalyst. The supported catalyst prepared by the method shows high catalytic activity under the condition of low noble metal loading capacity, the preparation cost of the catalyst is reduced, and the catalyst shows good durability under the specific morphology of the manganese dioxide carrier and the interaction between the manganese dioxide carrier and noble metal.

The application provides an optical camera lens, comprising a lens barrel, a first lens to a sixth lens, a first spacing element located on the image side of the first lens and in contact with the image side surface of the first lens, a second spacing element located on the image side of the second lens and in contact with the image side surface of the second lens, a third spacing element located on the image side of the third lens and in contact with the image side surface of the third lens, a fourth spacing element located on the image side of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacing element located on the image side of the fifth lens and in contact with the image side surface of the fifth lens; the maximum field angle of the optical camera lens is greater than 110 degrees; the outer diameter D5s of the object side surface of the fifth spacing element, the inner diameter d5s of the object side surface of the fifth spacing element, the effective focal length f of the optical camera lens, and the maximum field angle FOV of the optical camera lens satisfy the following relationship: (D5s+d5s) / [f*tan(FOV / 2)]<2.0. The application solves the problem of poor edge imaging quality of the optical camera lens in the prior art.

The invention relates to a high-rigidity heavy-load precision speed reducer capable of achieving state monitoring. The high-rigidity heavy-load precision speed reducer comprises an outer box shell, a power input unit, a planetary cycloid transmission unit, a power output unit and a state monitoring unit. The planet cycloid transmission unit is installed in the outer box shell, a power input piece of the planet cycloid transmission unit is a sun gear, and a power output piece is a planet carrier. The power input unit comprises a servo motor and a hand-cranking device, the servo motor and the hand-cranking device are respectively connected with an input shaft, two input gears fixed on the two input shafts are meshed with a main power gear, and the main power gear is coaxially and fixedly connected with the sun gear; the power output unit comprises an output gear which is coaxially and fixedly connected with the output end of the planet carrier; a temperature and pressure sensor, an oil product sensor and an adjustable ventilation device of the state monitoring unit are all installed on an outer box shell, and an angle sensor is coaxially and fixedly installed on an output gear. According to the invention, the output angle, oil composition, temperature signals and pressure signals of the speed reducer are monitored in real time, so that the abnormal state of the speed reducer can be quickly judged.

The application discloses a kind of lentinus edodes factory directional single side cultivation method, belong to lentinus edodes cultivation technical field, the application adds hydrated silica in lentinus edodes liquid culture medium, effectively controls lentinus edodes ball size using its high friction value, make its flowability stronger, and sodium calcium phosphosilicate can effectively improve lentinus edodes mycelium amount.Red and blue double film bag is used simultaneously with the characteristics of light transmission and oxygen injection, causing the difference in maturity of the surface of the stick, so as to realize the mature face mushroom, non-mature face energy supply.Through the special mushroom cultivation layer frame setting stick independent liquid supplement component, it can not only increase the connection firmness of lentinus edodes stick and frame, but also realize liquid supplement on cultivation layer frame.The application overcomes the difference in evaporation speed of the mushroom surface caused by the stick layer block in the layer frame mode, significantly shortens the lentinus edodes cultivation period, realizes the stable synchronization of stick color change, directional mushroom, precise water replenishment, and has good economic benefits and application prospect.

The invention discloses a PtPdCuFe alloy nano enzyme material, and belongs to the technical field of nano materials and analytical chemistry. According to the technical key points, four metal atoms of platinum, palladium, copper and iron are uniformly distributed on the nanoscale to form an alloy structure, and the unique quaternary composition and atomic-scale mixing generate a synergistic effect, so that the catalyst has excellent oxidase-like and peroxidase-like activities at the same time. The invention also discloses a colorimetric sensor containing the material, and a method for detecting in a buffer system through catalytic oxidation and coupling with nitrite by using the oxidase-like activity of the material. According to the method, the peroxidase-like activity of the material is utilized, and TMB oxidation is inhibited through thiophanate-methyl in the presence of hydrogen peroxide for detection. The invention further discloses a method for synthesizing the quaternary alloy material through a one-step hydrothermal method. The method is mainly used for high-sensitivity and high-selectivity rapid colorimetric analysis of nitrite pollutants and thiophanate-methyl pesticide residues in food and environmental samples.

The utility model relates to the technical field of dies, in particular to a pipe coating extrusion die which comprises a mouth die, a core die and a scraping sleeve, and a conical hole penetrating through two opposite ends of the mouth die is formed in the mouth die along the axial direction of the mouth die; the core mold is arranged in the conical hole, a pipe channel penetrating through the two opposite ends of the core mold is formed in the core mold in the axial direction of the core mold, and the core mold and the conical hole form a conical compression runner without a straight section, so that the mold pressure is effectively reduced, and material melt backflow is avoided; in addition, a scraping sleeve is arranged at the discharging end of the mouth mold, a scraping hole penetrating through the two opposite ends of the scraping sleeve is formed in the scraping sleeve, the scraping hole is coaxial with the pipe channel, and due to the fact that the inner diameter of the scraping hole is slightly larger than the inner diameter of a port of the narrow-mouth end of the conical compression runner, the pipe enters the scraping hole after stretching out of the discharging end of the conical compression runner; and a coating layer coating the outer wall of the pipe can be scraped through the scraping holes, so that the size of the coating layer is effectively controlled, and the smoothness of the outer surface of the coating layer on the outer wall of the pipe is ensured.

The embodiment of the utility model discloses a long-focus receiving lens and a laser radar, in the long-focus receiving lens provided by the embodiment of the invention, a first lens and a second lens have positive focal power and adopt convex-concave surface types, a third lens has positive focal power and adopts a biconvex surface type, a fourth lens has negative focal power and adopts a biconcave surface type, and a fifth lens has positive focal power and adopts a biconvex surface type. The fifth lens has negative focal power and adopts a concave-convex surface type, and the sixth lens has negative focal power and adopts a double-concave surface type. According to the technical scheme, the shapes of the mirror surfaces of the lenses of the telephoto receiving lens are reasonably matched, so that the lens has a shorter optical total length, the size of the receiving lens is effectively controlled, and the telephoto receiving lens can adapt to a larger image surface size through setting the shapes of the mirror surfaces of the lenses, so that the image quality of the telephoto receiving lens is improved. High resolution and low distortion are achieved, and the imaging effect is not affected by shortening the total optical length.

This invention relates to a continuous flow stepwise crystallization method and system for preparing micro / nano HMX at the microscale. It includes the following steps: (1) dissolving HMX in a solvent to form an HMX solution, and mixing the solvent and antisolvent to prepare a crystallization transfer solution; (2) flowing the HMX solution prepared in step (1) and the antisolvent into a primary micro-mixing crystallization unit at a desired flow ratio to generate a mixed-crystal HMX suspension with a mixed crystal particle size of 400 nm–60 μm; (3) flowing the mixed-crystal HMX suspension flowing out of the primary micro-mixing crystallization unit and the crystallization transfer solution prepared in step (1) into a secondary micro-mixing crystallization unit at a desired flow ratio, and secondary crystallizing the mixed-crystal system to obtain a pure β-HMX suspension with a crystal size in the micrometer range. This invention can obtain micro / nano β-HMX with high crystallization degree and high crystal purity by changing the mixing conditions and residence time in the secondary crystallization unit; the two-step crystallization method can meet the requirements for continuous and controllable preparation of high-quality elemental β-HMX with smaller crystal size and higher crystal purity.

The invention discloses a modified lithium titanate material as well as a preparation method and application thereof, and the preparation method comprises the following steps: S100, ball-milling a titanium source and a lithium source to prepare first powder; s200, heating and carrying out a first solid-phase reaction on the first powder to prepare a first precursor comprising a lithium titanate crystal nucleus; s300, carrying out densification treatment on the first precursor to obtain a blocky second precursor, and heating to carry out a second solid-phase reaction on the second precursor to prepare a blocky third precursor containing single-crystal lithium titanate; and S400, mechanically crushing the third precursor to prepare the modified lithium titanate material. Wherein the modified lithium titanate material is single crystal lithium titanate particles, the use stability and the use safety of the lithium ion battery are enhanced, and the modified lithium titanate material has low porosity and is beneficial to improving the energy density of the lithium ion battery. The modified lithium titanate material with high thermal stability is beneficial to enhancing the use safety and use stability of the lithium ion battery under a high-temperature working condition.