31results about How to "Not difficult to operate" patented technology

The invention relates to a preparation method of 1,2,4-trifluoro-benzene, belonging to the technical field of preparation methods of chemical drug intermediates. The preparation method comprises the following steps of: (1) generating salifying reaction on 3,4-difluoroaniline and fluoboric acid, and then generating diazotization reaction with sodium nitrite to obtain fluoboric acid diazonium salt;and (2) under the solvent-free condition, carrying out high-temperature cracking reaction on the fluoboric acid diazonium salt at the temperature of 80-300 DEG C to obtain 1,2,4-trifluoro-benzene. The preparation method has the advantages of cost saving of raw materials, relatively simple process flow, mild reaction condition, low operation difficulty, operability and convenient aftertreatment; and the prepared products have the purity increased to 98 percent or more now from 80 percent or less originally, are stable in quality, and are suitable for large-scale industrial production.

The invention discloses a compounding method of a carbon steel-based stainless steel inside clad tube, which belongs to the technical field of fluid transmission pipe manufacturing. The invention aims to provide a compounding method which is capable of maintaining the advantages and overcoming the disadvantages of stainless steel tubes and significantly reducing the cost. The technical proposal includes the following steps that: one end of a stainless steel tube is inserted into a carbon steel tube, wherein, the outside diameter of the stainless steel tube is slightly smaller than the inside diameter of the carbon steel tube, the stainless steel tube is longer than the carbon steel tube, and the diameter of the other end of the stainless steel tube is expanded by a hydraulic flaring machine; the carbon steel tube is gripped by a hydraulic gripper; the cold drawbench is started up to push the internal mold, whose largest working outside diameter is a slightly larger than the inside diameter of the carbon steel tube, into the stainless steel tube from the expanded end, and the internal mold is towed by the mandrel in the cold drawbench to execute spiral beeline movement of forward rotary extrusion until coming out of the other end of the stainless steel tube; here, the carbon steel-based stainless steel inside clad tube is produced. The compounding technique of the invention has the characteristics of easy operations, good compounding effect, low power consumption and high speed.

The invention discloses a method for preparing 2-chloropyrimidine, belonging to the technical field of methods for preparing chemical medicine intermediates. The method for preparing the 2-chloropyrimidine comprises the following steps of: (1) reacting dicyandiamide with ammonium chloride at high temperature, and obtaining guanidine hydrochloride; (2) reacting the guanidine hydrochloride with 1.1.3.3-tetramethoxypropane by refluxing under the condition of taking industrial hydrochloric acid as a solvent to obtain 2-amino pyrimidine; and (3) reacting the 2-amino pyrimidine with sodium nitrate at low temperature for producing the 2-chloropyrimidine by taking zinc chloride as a catalyst and taking the industrial hydrochloric acid as the solvent. The preparation method disclosed by the invention has the advantages of lower cost of raw materials, relatively simple technical process, mild reaction conditions, low operation difficulty, excellent maneuverability; convenience for post-treatment; and largely improved yield stable quality and applicability of large-scale industrial production of prepared products,.

The invention discloses a thermomechanical treatment method for aluminium alloy grain refinement. The method comprises the following steps: insulating an aluminium alloy for 30-60min for 360-460 DEG C, then cooling the aluminium alloy material to room temperature and then carrying out rolling deformation with a rolling deformation amount of 18-30%, then carrying out low-temperature annealing treatment on the pre-deformed aluminium alloy material for 24-168h at 260-290 DEG C, cooling the aluminium alloy material subjected to the low-temperature annealing to room temperature and then carrying out rolling deformation with a total rolling deformation amount of 80-96%, and finally carrying out recrystallization annealing on the rolled-formed aluminium alloy for 0.5-24h at 260-310 DEG C. The structural state of an aluminium alloy plate treated by the method disclosed by the invention is uniform and fine isometric crystals, thus 1-2[mu]m fine-grain structural state is realized; and moreover, the method disclosed by the invention has the characteristic of no limits on machining equipment, and dimensions of machined workpieces.

The invention discloses a method for preparing 2-chloropyrimidine, belonging to the technical field of methods for preparing chemical medicine intermediates. The method for preparing the 2-chloropyrimidine comprises the following steps of: (1) reacting dicyandiamide with ammonium chloride at high temperature, and obtaining guanidine hydrochloride; (2) reacting the guanidine hydrochloride with 1.1.3.3-tetramethoxypropane by refluxing under the condition of taking industrial hydrochloric acid as a solvent to obtain 2-amino pyrimidine; and (3) reacting the 2-amino pyrimidine with sodium nitrate at low temperature for producing the 2-chloropyrimidine by taking zinc chloride as a catalyst and taking the industrial hydrochloric acid as the solvent. The preparation method disclosed by the invention has the advantages of lower cost of raw materials, relatively simple technical process, mild reaction conditions, low operation difficulty, excellent maneuverability; convenience for post-treatment; and largely improved yield stable quality and applicability of large-scale industrial production of prepared products,.

The invention relates to the field of planting of flowers and nursery stocks, in particular to a method for promoting quick rooting of cuttage of rose seedlings. The method comprises the steps of (1)preparation before cuttage, (2) cuttage of rose cutting slips, (3) rooting culturing and (4) seedling hardening and transplanting. The cuttage method can effectively increase the survival rate of cuttings of rose seedlings, effectively shortens rooting time, and is large in application value.

A step-by-step recursive nanoscale measurement system based on a high-precision electric probe, including a control part, an iron core (9) placed between a first coil (10) and a second coil (8); a measuring rod (7 ), one end of which is connected to the iron core (9), and the other end is connected to the measuring rod contact (5); the upper and lower ends of the nano-scale micro-feeding device (6) are fixed on the measuring rod (7). The micro-displacement of the object (4) provides the feed amount; the control part controls the micro-feeding device (6) with nanometer-level precision according to the displacement of the object to be sided. The present invention adopts a step-by-step recursive method for micro-displacement measurement, on the one hand, the nano-level measurement is easy to realize, and on the other hand, the whole measurement system has a larger measurement range. Therefore, the nanoscale feeding device determines that the measurement system has high measurement accuracy. The measurement system adopts contact measurement, so this system is suitable for quasi-static micro-displacement measurement.

The invention provides a bone-imitative composite material scaffold and a preparation method thereof. The natural wood is de-lignified, and then compounded with hydroxyapatite to obtain an osteoinductive scaffold material, and the extracellular The matrix is ​​simulated to obtain the bone-mimetic composite scaffold. The invention obtains a highly anisotropic porous scaffold, and the three-dimensional pore structure provides channels for the transport of nutrients and intracellular growth and regeneration, overcomes the shortcomings of traditional isotropic scaffold materials and meets the strength and stability requirements of bone tissue regeneration. The method does not need to use special reagents and equipment, the operation is not difficult, the process conditions are mild, and it has the characteristics of easy production and popularization and application.

The invention relates to a method for controlling grain equi-axiation to improve plasticity of a Ti20Zr6.5Al4V alloy. The method mainly comprises the steps that a Ti20Zr6.5Al4V alloy bar is cut into a round ingot with the thickness being 16 mm, and the round ingot is cleaned up; the round ingot is put into a resistance furnace to be heated till the temperature ranges from 950 DEG C to 1,050 DEG C, heat preservation is carried out for 20 min to 40 min, and the round ingot is quickly placed in water for quenching after being taken out; then the alloy ingot is heated till the temperature ranges from 750 DEG C to 900 DEG C at the speed being 10 DEG C / min, the heat preservation time is shorter than 5 min, the alloy ingot is subjected to rolling deformation through a dual-roller mill after being taken out, the rolling speed ranges from 0.3 m / s to 0.6 m / s, and the reduction in single pass ranges from 0.5 mm to 2 mm; heating-rolling is repeated 5-20 times in the same way till deformation reaches 60% or above, and air cooling is carried out until the room temperature is obtained; and then the alloy is subjected to annealing treatment after being heated, the annealing temperature ranges from 750 DEG C to 850 DEG C, and furnace cooling is carried out until the room temperature is obtained after heat preservation is carried out for 1 h to 12 h. According to the method, operation is easy, and the production cost is low; and the plasticity of the alloy is remarkably improved while strength is guaranteed.

The invention discloses a method for filling the bottom of an embedded steel plate of a support. The method comprises the following steps: 1, pouring a concrete support foundation layer; 2, a template and a material guiding strip are installed; thirdly, backfill materials are poured from the feeding port; 4, pouring and exhausting the bottom of the embedded steel plate; and fifthly, the support and the embedded steel plate are integrally formed. According to the method, a two-time pouring mode is adopted, the purposes that the bottom of the support embedded steel plate is densely poured, and follow-up drilling and grouting operation is not needed can be achieved, the operation difficulty is low, the construction quality is controllable, safety, reliability, economy and reasonability are achieved, and the bottom of the support embedded steel plate can be efficiently and rapidly tamped.

The invention relates to a preparation method of 1,2,4-trifluoro-benzene, belonging to the technical field of preparation methods of chemical drug intermediates. The preparation method comprises the following steps of: (1) generating salifying reaction on 3,4-difluoroaniline and fluoboric acid, and then generating diazotization reaction with sodium nitrite to obtain fluoboric acid diazonium salt;and (2) under the solvent-free condition, carrying out high-temperature cracking reaction on the fluoboric acid diazonium salt at the temperature of 80-300 DEG C to obtain 1,2,4-trifluoro-benzene. The preparation method has the advantages of cost saving of raw materials, relatively simple process flow, mild reaction condition, low operation difficulty, operability and convenient aftertreatment; and the prepared products have the purity increased to 98 percent or more now from 80 percent or less originally, are stable in quality, and are suitable for large-scale industrial production.

The invention relates to the field of seedling growing of plants, in particular to a method for promoting quick rooting of cuttage of babysbreath seedlings. The method comprises the steps of (1) preparation before cuttage, (2) cuttage of the babysbreath seedlings, (3) rooting culturing and (4) seedling hardening and transplanting. The method is simple in operation, cannot be limited by seasons, can be completed in the room, can effectively increase the survival rate of cutting seedlings of babysbreath, shortens rooting time of cuttage, and is large in application value.

The invention provides a device for compensating the difference of height by which a helicopter lands on a non-horizontal ground and the method thereof, which aim at addressing the problem that the helicopter lands on the non-horizontal ground. The device comprises three ranging sensors used for testing the pitch angle and spinning angle of the non-horizontal ground, three leg-type landing gears comprising a landing platform fixedly connected with the body of the helicopter and three landing supporting legs fixed on the landing platform and a control device respectively electrically connectedwith three ranging sensors and three power output devices; power output devices independent of each other are arranged between each landing supporting leg and the landing platform. When the helicopter lands, the measurement results of the ranging sensors are used for calculating the pitch angle and spinning angle of the non-horizontal ground and then controlling the pitch angle and spinning angleof the plane on which three landing ends of three landing supporting legs to be equal to the pitch angle and spinning angle of the non-horizontal ground so that the helicopter can be controlled to land vertically.

The invention provides a bone-targeted salmon calcitonin, which is formed by opening the disulfide bond in the salmon calcitonin molecule and covalently coupling it with a bone-targeted coupling molecule. The preparation method is as follows: (1) To prepare bone-targeting coupling molecules, (2) dissolving salmon calcitonin in a water-soluble solvent with a pH value of 5 to 7, adding a reducing agent to reduce the disulfide bonds of salmon calcitonin to form free sulfhydryl groups, and then adding The bone-targeting coupling molecule is stirred and reacted at 0-40° C. for 0.5-12 hours, the crude product is separated, and purified by preparative liquid chromatography to obtain the bone-targeting salmon calcitonin. The bone-targeted salmon calcitonin provided by the invention has no cytotoxicity and immunogenicity, can improve the bone tissue enrichment ability of the calcitonin, can effectively repair the bone tissue, and has broad application prospects.

The invention discloses a three-dimensional carbon nano phase composite reinforced aluminum base material and a preparation method thereof. It is to firstly immerse the aluminum powder in the ethanol solution containing bisphenol A diglycidyl ether and nickel nitrate hexahydrate, stir magnetically and add ethylenediamine dropwise to obtain the surface-treated aluminum powder, and then pass the surface-treated aluminum powder through After reduction, it is mixed with graphene oxide and subjected to low-speed ball milling, and then reduced to obtain three-dimensional carbon nanophase-coated aluminum powder. Finally, these aluminum powders are subjected to SPS sintering and cold rolling to obtain a three-dimensional carbon nanophase composite reinforced aluminum matrix. Material. The process of the invention is simple and easy to operate, and the cost is low. The obtained composite reinforced aluminum-based material enhances the load transfer efficiency by constructing a three-dimensional carbon nanophase, thereby significantly improving the mechanical properties of the aluminum-based composite material, so that it not only has high tensile strength, but also Maintain good elongation and toughness, and have good scalability.

The invention discloses a surfacing welding method for an abraded large roll shaft. The surfacing welding method is characterized by comprising the following steps that 1, preweld material analysis is carried out, preweld cleaning is carried out on the roll shaft, and preweld preparation is carried out; 2, after preweld preparation is finished, preweld preheating is carried out; 3, after preweld preheating is finished, automatic submerged arc welding is adopted for surfacing welding; 4, after surfacing welding is finished, welding slag is broken down, and postweld heat treatment is carried out; and 5, after heat treatment is finished, finally machining is carried out according to requirements. After the surfacing welding method is adopted, surfacing welding layer defects at the surfacing welding position are few, and the forming quality of a welding channel is good; the hardness of the surfacing welding position is distributed in a ladder manner from low to high from inside to outside, and the hardness of the outermost layer even ranges from 55 HRC to 60 HRC; the impact toughness and strength of the surfacing welding position are equal to those of the roll shaft and even exceed those of a base material by 1-2 times; the capacity for resisting spalling fatigue damage is high, the surfacing welding effect is remarkable, and the welding quality requirement can be completely met; and the whole surfacing welding process is easy to master and control, and good economical efficiency is achieved.

The invention relates to the field of sintering technology, and specifically discloses a semiconductor glaze layer sintering method for improving the matching degree of semiconductor components and a central electrode, which is used for sintering a semiconductor glaze layer on a porcelain tube, and is characterized in that: firstly, the center electrode wax is made according to the shape and size of the center electrode Then fit the porcelain tube with the wax mold of the center electrode, inject the pre-configured semiconductor enamel into the gap between the outer cone surface of the center electrode and the inner cone surface of the porcelain tube, and put it into the furnace for heating after the semiconductor enamel cools naturally sintering. The semiconductor glaze layer sintered by the method for sintering the semiconductor glaze layer can improve the matching degree between the semiconductor component and the central electrode, thereby avoiding the increase of the insulation resistance between the central electrode and the semiconductor component due to the poor coordination between the central electrode and the semiconductor component, and improving the electric resistance. Mouth pyrogenicity.