241results about How to "Convenient source" patented technology

The invention relates to the technical field of quality traceability management, in particular to an organic fertilizer quality safety traceability management method based on multi-source data. The method comprises the following steps: collecting organic fertilizer source data in real time from links of organic fertilizer production, circulation, storage and use, performing standardization processing, and performing production batch synchronous set processing and traceability association connection file establishment to generate an organic fertilizer multi-source data traceability association connection file; and carrying out production batch tracing extraction processing on the organic fertilizer multi-source data traceability association connection file, carrying out organic fertilizer quality index evaluation analysis and quality index error limitation analysis, carrying out organic fertilizer quality safety abnormity traceability processing and abnormity decision support processing, and generating an organic fertilizer quality safety abnormity problem decision support report. Therefore, the corresponding organic fertilizer quality safety abnormity traceability problem management work is executed. The scientificity and accuracy of organic fertilizer quality safety management can be improved.

The invention belongs to the technical field of discrete intelligent manufacturing, and particularly relates to a discrete intelligent manufacturing method and system.The discrete intelligent manufacturing method comprises the following specific steps that product information in order products is split to form a bill of materials, the received order information is stored based on ERP software, and according to data in the bill of materials, the order information is stored according to the data in the bill of materials; computer aided design software is adopted to create a three-dimensional detailed model of the product, parts of the three-dimensional detailed model of the product are split, and the production quantity and time nodes of each part are determined; through the cooperation of the structure, the materials required by the product orders are split and listed according to the number of the product orders, so that workers can purchase the materials required by the products more conveniently, and through the mutual cooperation of the ERP system and the MES system, according to the materials listed on the material list, the materials required by the products can be purchased more conveniently. According to the method, the production steps are split while the number and the time node of the parts processed by the materials are determined, so that the parts are produced in batches in the production process.

The invention discloses a method for preparing a porous ceramic filter ball from electrolytic manganese residues, and relates to the technical field of environmental protection and ceramic materials, and the method comprises the following steps: (1) raw material treatment: crushing the electrolytic manganese residues into particles of 2-3 cm, drying by using a dryer, and after drying, carrying out ball milling and sieving on the electrolytic manganese residues by using a planetary ball mill to obtain a raw material; (2) weighing and proportioning raw materials: weighing and proportioning the raw materials in percentage by weight: 50-80% of electrolytic manganese residues, 20-50% of calcined kaolin, 0-10% of an additional cosolvent and 0-10% of a pore-forming agent; (3) mixing the raw materials; and (4) granulating and aging the mixture. According to the method for preparing the porous ceramic filter balls from the electrolytic manganese residues, a brand new path is developed for comprehensive utilization of the electrolytic manganese residues, the path enables the utilization rate of the electrolytic manganese residues to be greatly increased, the path becomes an extremely effective path for consuming the electrolytic manganese residues, the electrolytic manganese residues can be fully utilized due to the characteristic of high utilization rate, and efficient cyclic utilization of resources is achieved.

The invention belongs to the field of sodium ion solid electrolyte manufacturing, and particularly relates to a terbium-doped NASICON type sodium ion conductor material and a preparation method thereof. The stoichiometric formula of the terbium-doped NASICON-type sodium ion conductor material is Na < 3 + x > Zr < 2-x > Tb < x > Si < 2 > PO < 12 >, x is more than 0 and less than or equal to 0.3, and the total ionic conductivity of the terbium-doped NASICON-type sodium ion conductor material is 3.07 * 10 <-4 > S / cm to 1.02 * 10 <-3 > S / cm. Compared with the prior art, a proper amount of terbium ions are used for replacing skeleton ions (such as Zr < 4 + >) in an NASICON structure, so that the concentration of transferable sodium ions is increased, and the ionic conductivity is improved. By doping terbium ions, the size of a sodium ion transmission channel is effectively increased, the transmission energy barrier is reduced, and the ionic conductivity is further improved. The ionic conductivity of the Na < 3.2 > 2Zr < 1.8 > Tb < 0.2 > Si2PO12 electrolyte doped with terbium ions at the room temperature reaches 1.02 * 10 <-3 > S / cm. According to the invention, the selected raw materials are economical and practical oxides, and the raw materials are easy to purchase and low in price, so that the production cost can be reduced.

The invention discloses a preparation method of a phenolic chitosan quaternary ammonium salt antibacterial agent, which comprises the following steps: alkalizing chitosan at low temperature, then carrying out substitution reaction on the alkalized chitosan and a carboxylic acid derivative, and introducing a reactive carboxyl group on the hydroxyl of the chitosan to obtain O-carboxylated chitosan, so as to provide reactive sites for subsequent secondary modification; the preparation method comprises the following steps: preparing O-carboxylated chitosan, introducing a quaternary ammonium salt group on an amino group of the O-carboxylated chitosan through a ring-opening reaction so as to improve the antibacterial property and water solubility of the chitosan, and finally reacting with a phenolic derivative to obtain the phenolic chitosan quaternary ammonium salt antibacterial agent. According to the preparation method of the phenolic chitosan quaternary ammonium salt antibacterial agent, industrial production is easy, and the prepared phenolic chitosan quaternary ammonium salt antibacterial agent has good antibacterial performance and free radical scavenging capacity and also has good water solubility.

The invention belongs to the technical field of chemical agents, and provides a preparation method and application of an algicide for synchronously removing water bloom algae cells and algal toxins, the algicide is composed of calcium hypochlorite and natural clay, and the mass ratio of calcium hypochlorite to clay is 1: 1-5; the natural clay is at least one of bentonite, kaolin or diatomite; natural clay is used as a flocculating agent to prepare the algaecide, the algaecide is basically free of pollution to the ecological environment of a water body, calcium hypochlorite breaks the surface charge balance of algae cells by damaging the algae cells, rapid flocculation and sedimentation of the algae cells under the action of clay are facilitated, the removal rate reaches up to 80% or above, and the flocculation and sedimentation efficiency of the natural clay on the algae cells is far higher than the flocculation and sedimentation efficiency of the natural clay on the algae cells; after the algaecide is used for treatment, algaecide cells are broken, algaecide toxins in the cells are released, but calcium hypochlorite can quickly oxidize the toxins, so that the algaecide can synchronously remove algaecide toxins in water while removing water bloom algaecide cells, and the removal rate is up to 90% or above.

The invention provides an anti-tumor modification method of stem / progenitor cell-derived neutrophil, which comprises the following steps: extracting mouse bone marrow-derived Lin-progenitor cells and human umbilical cord hematopoietic stem / progenitor cells, modifying ER-Hoxb8 progenitor cells by gene editing, and inducing the ER-Hoxb8 progenitor cells into neutrophil; three modification strategies of chimeric antigen receptor CAR gene engineering modification, high expression MET gene modification and high expression of IFN-gamma while the TGFBR2 gene is stably knocked out are respectively adopted, and the anti-tumor phenotype of the neutrophil N1 is maintained. Compared with the prior art, the engineering neutrophile granulocyte has the following advantages that the engineering neutrophile granulocyte prepared by the method has the advantages of infinite sources, long-time preservation, safety, controllability, efficient and rapid preparation and the like; the engineered neutrophil can maintain the N1 antitumor phenotype and promote the antitumor function; the immunosuppression microenvironment of the solid tumor can be improved and the treatment effect can be improved by singly using or combining the immune checkpoint inhibitor.

The invention relates to an agricultural and forestry waste-red mud composite self-sensing building material and a preparation method thereof.The preparation method comprises the steps that a mixture of agricultural and forestry waste and red mud is treated in a high-temperature calcination mode, and the agricultural and forestry waste is subjected to thermal cracking under the high-temperature condition to form biochar fibers with certain conductivity; the preparation method comprises the following steps: reducing ferric oxide in red mud into ferroferric oxide with high magnetism, further endowing the red mud with electromagnetic functionalization, and finally preparing the self-sensing building material by adopting pyrolytic charcoal fibers, the electromagnetic functionalized red mud and self-granulation conductive aggregates together. The method not only overcomes the problems of high manufacturing cost, high environmental pollution risk, poor stability and the like of traditional self-sensing building materials, but also has the advantages of wide raw material sources, simple preparation process, low cost and facilitation of industrial large-scale production, and realizes resource utilization of agriculture, forestry and industrial solid wastes.

The invention relates to a preparation process of a fluorination liquid, in particular to a preparation method and device of perfluorohexane, and the preparation method comprises the following steps: mixing hexafluoropropylene and fluorine-containing gas for reaction to obtain crude perfluorohexane; the method comprises the following steps of: performing primary alkali washing and secondary alkali washing on a crude product of perfluorohexane, removing moisture, and finally performing primary condensation and secondary condensation to obtain the product of perfluorohexane by primary condensation and recover hexafluoropropylene for circular reaction by secondary condensation. The preparation device comprises a reaction tower, a buffer tank, a primary alkaline washing tower, a secondary alkaline washing tower, a drying tower, a first cold trap and a second cold trap which are communicated in sequence. The method is simple in production process, high in hexafluoropropylene conversion rate, high in product purity and low in comprehensive cost, and has good economic benefits and application prospects.

The utility model belongs to a garbage resource utilization device which mainly comprises garbage pretreatment equipment, a feeder, an anaerobic pyrolyzing furnace, a thermal cracking tubular furnace, a flue gas purification device, a gas-liquid separator, an alkali liquor pump, a gas deacidification tower, a gas buffer tank, a compressor I, a pressure swing adsorption (PSA) hydrogen separator, a compressor II, a hydrogen storage tank, a carbon residue storage tank and a condenser. An induced draft fan and a chimney; gas-phase products obtained after garbage pyrolysis are mixed with water vapor and then subjected to thermal cracking in the high-temperature cracking tube furnace at the temperature of 1000-1300 DEG C to become hydrogen and carbon residues, the hydrogen conversion rate is high, and the device is simple in structure, convenient to process and purchase and easy to operate and has good industrial practicability.

The invention provides a glutamic acid determination kit and a determination method, and belongs to the technical field of in-vitro diagnosis. The kit comprises a reagent R1 and a reagent R2, the reagent R1 is composed of a first buffer solution, 4-aminoantipyrine, glutamate oxidase, ascorbic acid enzyme, a surfactant, a stabilizer and a preservative, and the reagent R2 is composed of a second buffer solution, a chromogenic substrate, peroxidase and a preservative. The preparation process of the kit is simple, the raw materials are easy to purchase, and the determination method using the kit has the advantages of being independent of large instruments, simple to operate, short in detection time, high in accuracy, good in precision and good in stability, is suitable for base layer detection, large-scale sample batch detection and the like, and has good application prospects.

The invention discloses a synthetic method of an alfasalone intermediate and a synthetic method of alfasalone, the synthetic method of the alfasalone intermediate comprises the following steps: carrying out hydrogenation reaction on a compound IN-2 to obtain a compound I, the hydrogenation condition is that a solvent ethanol or acetic acid and palladium on carbon are added, and the addition volume of the ethanol or acetic acid is 10-80 times of the weight of the IN-2; the synthesis method of the alfasalone comprises the following steps: carrying out elimination reaction on a compound SM to obtain an intermediate IN-1; performing ketal protection reaction on the intermediate IN-1 to obtain an intermediate IN-2; carrying out hydrogenation reaction on the intermediate IN-2 to obtain a compound I; carrying out ketal removal protection reaction on the compound I to obtain an intermediate IN-3; the intermediate IN-3 is subjected to carbonyl reduction through an enzyme method to obtain alfasalone; by exploring the reaction raw materials, the reaction solvent, the solvent addition amount, the reaction time and the like in the synthesis process of the alfasalone, the obtained product is high in yield and purity, and the industrial production of the alfasalone is realized.

The invention provides a specific polypeptide of Brucella, the amino acid sequence of the specific polypeptide is as shown in SEQ ID No.1, and the specific polypeptide is derived from BMEI1871 protein of Brucella. The invention also provides a recombinant vector or an expression cassette for expressing the specific polypeptide, and a recombinant cell or a recombinant bacterium. The invention verifies the application of the specific polypeptide in preparation of drugs or reagents for preventing, detecting or diagnosing brucellosis, and also provides an ELISA (enzyme-linked immuno sorbent assay) detection kit for detecting brucellosis. According to the present invention, the specific polypeptide of the brucella BMEI1871 protein is adopted as the antigen to establish the ELISA method for detecting the brucella antibody, such that the accuracy is high, and the powerful support is provided for brucellosis purification. The antigen source is convenient, the stability is high, the repeatability is strong, and the defects of using whole bacteria or lipopolysaccharide as the antigen are overcome.

The invention discloses a preparation method of an antibacterial peculiar smell removing solution and a product of the antibacterial peculiar smell removing solution. Quaternary phosphonium salt, a surfactant and mercaptan are sequentially added into a beaker according to the weight ratio and evenly stirred; adding deionized water, and stirring to uniformly dissolve the deionized water; heating to 40-50 DEG C, keeping the temperature for 10-20 minutes, slowly adding zinc phenolsulfonate, and uniformly stirring; and cooling, adding the plant extract, and uniformly stirring. The preparation material source is convenient, the operation method is simple, the preparation condition is mild, the method is suitable for large-scale production, and the prepared liquid is safe and non-toxic, is suitable for various occasions, and has good popularization value in the aspect of indoor air purification application.

The invention provides a hydrogel material, which is prepared from the following components in parts by weight: 6 to 15 parts of polyvinyl alcohol, 12 to 20 parts of polyhydric alcohol, 40 to 75 parts of water, 2.1 to 11.5 parts of conductive metal salt, 0.001 to 0.01 part of carboxylated cellulose and 5 to 15 parts of polyacrylic acid, the conductive metal salt comprises a first conductive metal salt and a second conductive metal salt, the first conductive metal salt is selected from at least one of zinc salt and magnesium salt, and the second conductive metal salt is selected from at least one of aluminum salt and ferric salt. The ionic conductive PVA hydrogel which is high in mechanical strength, resistant to stretching and capable of achieving self-healing is rapidly prepared, has excellent strain, pressure and temperature sensing capacity and is widely applied to health monitoring.

The invention relates to a nitrogen filling inerting and exhaust liquid nitrogen subzero treatment system of an external floating roof tank, which comprises the external floating roof tank (1), an external floating roof (2), a primary seal (3), a sealed space (4), a secondary seal (5), a pressure transmitter (6), a frequency conversion fan (7), a sampling pump (8), a gas sensor, a subzero condenser (11), a liquid nitrogen tank (12), a nitrogen injection valve (15) and a nitrogen buffer tank (16), the sealed space (4) is connected with the cryogenic condenser (11) through the pressure transmitter (6) and the frequency conversion fan (7), the sampling pump (8) is connected with the sealed space (4) and the cryogenic condenser (11), the gas sensor is arranged between the sampling pump (8) and the cryogenic condenser (11), the cryogenic condenser (11) is connected with the liquid nitrogen tank (12) and the nitrogen buffer tank (16), and the nitrogen buffer tank (16) is connected with the sealed space (4). The problems of nitrogen source of active safe nitrogen charging and oil gas recycling and up-to-standard emission of exhausted gas during nitrogen charging are solved.

This invention discloses an optimized extraction and purification process for total flavonoids from Hypericum perforatum and its application in photodamage protection. Belonging to the field of natural product extraction technology, the process includes the following steps: using Hypericum perforatum powder as raw material, ultrasonic-assisted extraction is performed, followed by centrifugation, collection of the supernatant, and repeated extraction of the residue twice. The supernatants are combined to obtain a total flavonoid extract from Hypericum perforatum. The extract is then purified by adsorption using a macroporous adsorption resin, and the eluent is collected, concentrated, and dried to obtain high-purity total flavonoids from Hypericum perforatum. This invention features a stable process, high extraction efficiency, and is environmentally friendly, making it suitable for industrial production. The prepared total flavonoids from Hypericum perforatum exhibit high purity and significant antioxidant and photoprotective effects, and can be widely used in antioxidant, skin protection, and sunscreen products.

The invention provides a double-carbon-layer-coated silicon-carbon negative electrode material and a preparation method and application thereof.According to the method, a nano silicon material can be preliminarily and uniformly coated with an amorphous carbon precursor material to form an inner carbon layer by means of a spray drying method; the preparation method comprises the following steps: preparing a nanometer silicon material, uniformly coating asphalt by using a liquid phase coating method to form an outer carbon layer so that the surface of the nanometer silicon material is uniformly coated with a double-carbon-layer material, carbonizing the nanometer silicon material coated with the double-carbon-layer material in inert gas by stages, gradually removing volatile substances from the double-carbon-layer material by gradually increasing the carbonization temperature, and preparing the nanometer silicon material with the double-carbon-layer material. And finally, the silicon-carbon negative electrode material with the double-carbon-layer-coated micro-nano spherical structure is obtained, and the double-carbon-layer-coated silicon-carbon negative electrode material shows excellent performance in the aspects of initial capacity, reversible capacity and residual capacity retention rate after circulation.

The utility model discloses a multi-cylinder shared air inlet buffer support which comprises a plurality of bottom plates with the number corresponding to that of middle bodies, supporting columns are fixedly arranged on the bottom plates, the upper ends of the supporting columns are all fixedly connected with a cross beam, a pair of inclined supporting beams are arranged on the cross beam, one end of each inclined supporting beam is provided with a pipe clamp used for clamping an air inlet buffer, and the other end of each inclined supporting beam is provided with a pipe clamp used for clamping the air inlet buffer. The utility model relates to the technical field of compressors, which has the advantages of simple structure, easiness in purchasing parts, low processing cost and convenience in maintenance, enhances the axial rigidity of a piston rod and resists the influence of drawing force brought by a piston on the air inlet buffer by adding two inclined support beams between the air inlet buffer and the middle body, and can be used as a reserved scheme. According to the vibration condition, the device can be installed on site at any time, and convenience is brought to people.

The present invention discloses a method for establishing a data model of a dairy product supply chain, and the present invention relates to the technical field of dairy product supply chain management, and solves the problem that dairy products cannot be completed synchronously and the delivery data processing thereof is not comprehensive enough. The present invention is directed to the delivery of dairy products, and based on the marked order time, a corresponding type of sorting table is determined according to the time sequence, and then the subsequent delivery routes are determined in sequence based on the delivery method, and the sorting table is combined with the order delivery route, so that not only the order delivery route can be fully determined, but also the order delivery route can be adjusted during the determination process. This adjustment method can not only ensure that the goods can be delivered as soon as possible, but also will not affect the shopping experience of the corresponding customers, thereby improving the overall effect of the entire order delivery and achieving better processing efficiency.

The present invention provides a biostimulant composition for increasing the folate content of crops, including an aqueous solution of synthetic folic acid and L-potassium glutamate, wherein the molar concentration ratio of the synthetic folic acid to L-potassium glutamate is 1:3-5, and the solvent is an aqueous solution of potassium carbonate. The present invention also provides a preparation and use method of the biostimulant composition. Synthetic folic acid is used as the main body of plant biostimulants, and L-glutamic acid, one of the synthetic precursors of natural folic acid, is added to stimulate the main body of crops such as fruits and vegetables to increase the synthesis and storage of natural folic acid, thereby increasing the content of folic acid in crops and improving the quality of crops.

The present application relates to a kind of biodegradable dark color mulch and its preparation method, and dark color mulch is made of cellulose, hemicellulose and degradable coating.The manufacturing method includes the preparation of dark color mulch substrate, coating layer coating.It specifically includes slurry compounding, beating, additive addition, is formed by papermaking, dehydration, pre-drying, coating, sizing, drying, calendering, product after drying.The local film has good wet strength, light resistance, weather resistance, heat preservation and entropy increasing effect.The results of farmland degradation experiment show that the mulch can be biodegraded after 50~60 days, and the biodegradation rate is more than 90%.

The invention relates to the technical field of allantoin preparation, in particular to a synthesis method of allantoin. The synthesis method comprises the following steps: (1) mixing and stirring glyoxal and nitric acid to react; (2) adding calcium hydroxide powder while stirring at room temperature, separating out white precipitate, and standing; (3) after filtering, washing filter residues with water, adding calcium chloride into the filtered mother liquor, stirring and dissolving, dropwise adding a sodium hydroxide aqueous solution, stopping adding alkali when the pH value reaches 3.0-3.5, and standing to obtain a fine-particle calcium glyoxylate white solid; (4) dissolving the prepared calcium glyoxylate with hydrochloric acid, adding urea, stirring and reacting, and generating white precipitate along with the reaction; and filtering, washing and drying the obtained precipitate to obtain the product allantoin. The invention aims to provide a synthesis method of allantoin, and aims to reduce the production cost and improve the product yield and purity.

The invention relates to a mortise module wall and outer wall masonry construction method. The method comprises the steps of design and planning, module prefabrication, storage and transportation, field installation, water prevention and heat preservation and interior and exterior decoration, specifically, painting and tiling are conducted on an inner wall and an outer wall, a suspended ceiling is installed on the inner wall, a curtain wall is installed on the outer wall, the decoration effect is achieved, and meanwhile necessary anti-weather treatment is conducted; through the arrangement of the dust removal operation, the joint between the mortise module wall and the outer wall masonry can be cleaned, so that the joint is not prone to become a dust, dirt and mould gathering area, mould and bacteria cannot be bred in a humid environment and a good cleaning condition, and the air quality and living health are improved; the situation that dirt accumulation and mildew growth at the joint affect the overall building appearance and reduce the attractiveness is avoided, meanwhile, the problems that in a traditional method, frequent redecoration is needed, and the maintenance cost is increased are solved, the problems of water accumulation and water seepage can be avoided due to convenient cleaning of connection, and the internal structure is further enhanced.

The invention provides an energy-saving method and system for producing high-purity ammonia from industrial ammonia. The method comprises five steps of mechanical filtration, vaporization, adsorption deoiling, adsorption dehydration and rectification. The system comprises a precision filter, a rectifying tower, a rectifying tower top cooler, a vaporizer, a superheater, a reboiler, a dealkylation adsorber and a molecular sieve dehydrator. According to the method and the system, various impurities are accurately removed, the product quality control is facilitated, and meanwhile, whether a certain process is bypassed or not can be determined according to the actual impurity condition of the raw material, so that the energy consumption is reduced; liquid ammonia exchanges heat with top gas of the rectifying tower to recover energy before being vaporized, so that energy is saved; heat sources of the vaporizer, the superheater and the reboiler all adopt circulating cooling water which is easy to obtain, heat integration with other devices is facilitated, and energy consumption is reduced; the pressure of circulating cooling water is lower than that of a liquid ammonia process side, materials in the heat exchanger cannot pollute products, and the product quality is guaranteed; the superheater is arranged behind the vaporizer, so that the ammonia gas is not easy to dew in the adsorption process, and the adsorption effect is not influenced.

The invention relates to the technical field of metallurgy, in particular to a preparation method of a high-nitrogen vanadium-nitrogen alloy and the high-nitrogen vanadium-nitrogen alloy.The preparation method comprises the following steps that 1, wet-based industrial-grade ammonium vanadate, a graphite carbon powder reducing agent, a metal iron powder catalyst and a water-based binder are mixed and stirred according to the mass ratio of 100: (18-22): (0.2-0.5): (8-20), and a mixture is obtained; 2, the mixed material is subjected to compression molding, and a preformed material is obtained; and 3, the preformed material is sequentially subjected to low-temperature pre-sintering dehydration treatment, high-temperature nitridation reduction treatment and cooling annealing treatment, and the high-nitrogen vanadium-nitrogen alloy is obtained. According to the preparation method, industrial-grade wet-based ammonium vanadate is directly adopted as a raw material, pretreatment is not needed, and the production cost is further reduced.

The utility model discloses a kind of acid-base unloading pump buffer tank and flushing water device, it is related to chemical equipment technical field;And the utility model includes unloading pump flushing inlet pipe, unloading acid-base pump, unloading pump flushing outlet pipe, acid-base pump machine seal flushing water inlet pipe, pump machine seal flushing water outlet pipe, buffer tank and control system, the unloading pump flushing inlet pipe is connected with unloading acid-base pump outlet pipe, first flushing inlet electric valve is equipped on the unloading pump flushing inlet pipe, the acid-base pump machine seal flushing water inlet pipe includes machine seal flushing inlet electric valve, the flushing water system of the utility model can be after unloading acid-base operation is completed remote control to unloading acid-base pump, conveying pipeline and buffer tank are flushed, without field operation, greatly improve cleaning efficiency, can thoroughly remove the acid-base liquid remaining in unloading pump, reduce equipment corrosion and environmental pollution, prolong the service life of equipment, reduce equipment maintenance cost.

This utility model discloses an auxiliary tooling for measuring the axial deformation of tapered roller bearings, relating to the field of bearing testing technology. It includes a pressure sleeve, a bearing ring, a support base, and a dial indicator. An annular boss is provided in the middle of the outer wall of the pressure sleeve. The bearing ring is interference-fitted to the bottom of the pressure sleeve. A groove for placing the bearing to be tested is provided on the upper surface of the support base. The lower end face of the bearing ring abuts against the upper end face of the bearing to be tested. A bracket is provided on the support base, and the dial indicator is fixedly mounted on the bracket with its probe abutting against the upper end face of the annular boss on the pressure sleeve. This utility model transmits the pressure applied by a press to the bearing to be tested, causing axial deformation. The dial indicator then accurately measures the displacement of the pressure sleeve, thereby indirectly obtaining the axial deformation measurement of the bearing. This facilitates specific statistical analysis of the axial displacement. The required materials are readily available, processing is convenient, costs are saved, and work efficiency is improved.

The utility model discloses a professional frequency converter control circuit for driving a water pump. The frequency converter comprises a main control chip U1, a switching value input interface circuit, a relay output interface circuit, an RS485 communication interface circuit, a CAN communication interface circuit, a frequency converter PWM drive circuit, a PTC signal acquisition interface circuit, an analog quantity acquisition interface circuit, an analog quantity output interface circuit, a buffer circuit and a monitoring circuit. According to the utility model, a professional frequency converter control circuit is combined with a plurality of functional modules, and accurate control and optimal adjustment of a water pump driving system are realized through the 32-bit DSP main control chip. The system has the advantages of being improved in performance, reduced in cost, improved in cost performance, convenient to produce, clean, environmentally friendly and the like, so that the system has higher stability, reliability and economical efficiency, is suitable for various industrial application scenes, and brings more convenient, reliable and efficient use experience for users.

The utility model belongs to the technical field of cutter disassembly and assembly, and particularly relates to a cutter locking structure which comprises a cutter and a cutter handle, and a cam tensioning mechanism is arranged between the cutter and the cutter handle. The cam tensioning mechanism comprises a lock shaft and an eccentric wheel installed on the lock shaft, an axial tensioning piece is arranged between the cutter and the cutter handle, the axial tensioning piece is movably assembled in the cutter handle, one end of the axial tensioning piece is in threaded connection with the cutter, and a tensioning hole is formed in the axial tensioning piece; or a tensioning hole is formed in the short taper shank of the cutter; the axis of the tensioning hole coincides with the central axis of the cutter handle and is perpendicular to the axis of the lock shaft. The lock shaft can rotate relative to the cutter handle, penetrates into the cutter handle and is connected with the tensioning hole in an inserted mode so that the eccentric wheel can be located in the tensioning hole, the eccentric outer side of the eccentric wheel makes contact with the hole wall of the tensioning hole, and the eccentric wheel drives the cutter to move in the axial direction of the eccentric wheel under rotation of the lock shaft so as to tension the cutter. And a locking structure is arranged between the lock shaft and the knife handle. The tool can be prevented from loosening and rotating relative to the tool handle, machining precision is guaranteed, machining efficiency is improved, and machining cost is saved.