9results about How to "Inhibit production" patented technology

This utility model relates to the field of steel wire production technology, and in particular to a broken wire identification device for cutting steel wire. It includes an operating table, a rotating mechanism fixedly installed on one side of the operating table, and a sleeve mechanism slidably connected to the inner side of the rotating mechanism. The rotating mechanism includes a grooved wheel with a sliding groove on its inner side. A spring is fixedly connected to the inner side of the grooved wheel, and a core is fixedly connected to the inner side of the spring. A fixing rivet is fixedly inserted through the inner side of the core. The sleeve mechanism includes a curved tube with a pull ring welded to its outer side and a sliding block welded to its outer side. A pressing assembly is fixedly connected to the inner side of the curved tube, and a clamping assembly is bonded to one end of the curved tube. The pressing assembly includes a curved rod with a connecting spring welded to its outer side. In this utility model, the sleeve mechanism enables precise dual identification of broken wires and surface defects during steel wire production, allowing the device to promptly report broken wires, intercept steel wires with quality defects, and avoid the production of substandard products.

The application provides a preparation method of 4-(hydroxymethyl phosphono)-2-carbonyl butyric acid, comprising the following steps: a) mixing methyl phosphonate diester, carboxylic acid and acryloyl cyanide to perform an addition reaction, and obtaining (3-cyano-3-carbonyl propyl) methyl phosphonate liquor after reduced pressure distillation; b) uniformly mixing the (3-cyano-3-carbonyl propyl) methyl phosphonate liquor obtained in step a) with water, cooling to 10-40 DEG C, then adding hydrochloric acid dropwise to perform acidification, continuing to stir for 0.1-1 h after the dropwise addition is completed, then performing a hydrolysis reaction, and finally performing purification treatment to obtain 4-(hydroxymethyl phosphono)-2-carbonyl butyric acid. Compared with the prior art, the preparation method provided by the application does not need to perform a cyanation reaction, avoids the use of high-cost, hard-to-obtain cyclic phosphonic anhydride and the highly toxic sodium cyanide; and the preparation method has short process steps, the raw materials are widely sourced and low in cost, the reaction conditions are mild, and the element comprehensive utilization rate is high.

The present application relates to the technical field of flow distribution disc, and particularly relates to a high-pressure flow distribution disc three-section flow groove anti-cavitation structure, which comprises a flow distribution disc, the flow distribution disc comprises two centrally-symmetrically arranged large waist-shaped grooves, small waist-shaped grooves are symmetrically arranged on the two sides of the large waist-shaped grooves, the small waist-shaped grooves are arranged through the flow distribution disc, three-section flow grooves and a second single-section flow groove are respectively arranged at the two ends of the large waist-shaped grooves, and the two three-section flow grooves are centrally symmetrically arranged; the three-section flow groove comprises three triangular grooves which are completely identical in structure, the three triangular grooves are arranged at equal intervals, and one end of a same circular-arc groove is communicated with the end portions of the three triangular grooves, and the other end of the circular-arc groove is communicated with the large waist-shaped groove. The present application can increase the flow area, reduce the jet velocity, weaken the influence of wall shear force, thereby inhibit vortex production, further inhibit cavitation phenomenon of the flow distribution disc of the axial plunger pump under high-pressure working condition, reduce flow pressure pulsation and cavitation, and improve the efficiency and service life of the axial plunger pump.

The utility model discloses a water-jet loom convenient to maintain, which relates to the technical field of water-jet looms and comprises a machine body, the inside of the machine body is hollow, a plurality of guide rollers are arranged in the machine body, fabric is in transmission connection with the surfaces of the guide rollers, a plurality of sliding grooves are formed in the machine body, and the sliding grooves are communicated with the guide rollers. A sliding transverse rod is slidably connected into the sliding groove, and a protective door is fixedly connected to the surface of the sliding transverse rod. According to the water-jet loom convenient to maintain, when the check block does not stop the supporting rod any more, the check block needs to be synchronously pulled out to rotate on the other side, and the situation that when the machine runs, due to vibration, a rotating block on one side is disengaged from the check block, and the supporting rod is not stopped any more can be prevented; and meanwhile, impurities such as dust and flyings generated in the machine body can be effectively prevented from entering a workshop, and the cleaning difficulty is reduced.

This invention provides a method for preparing 4-(hydroxymethylphosphono)-2-carbonylbutyric acid, comprising the following steps: a) mixing methylphosphonite diester, carboxylic acid, and acryloyl chloride, performing an addition reaction, and distilling under reduced pressure to obtain a (3-chloro-3-carbonylpropyl)methylphosphonate solution; b) mixing the (3-chloro-3-carbonylpropyl)methylphosphonate solution obtained in step a) with sodium cyanide, solvent, and catalyst, performing a substitution reaction, and purifying to obtain a (3-cyano-3-carbonylpropyl)methylphosphonate solution; c) mixing the (3-cyano-3-carbonylpropyl)methylphosphonate solution obtained in step b) with water, cooling to 10℃~40℃, adding hydrochloric acid dropwise for acidification, stirring for 0.1h~1h after the addition is complete, then performing a hydrolysis reaction, and finally purifying to obtain 4-(hydroxymethylphosphono)-2-carbonylbutyric acid. Compared with existing technologies, the preparation method provided by this invention has simple process steps, mild reaction conditions, and high comprehensive utilization rate of elements.

This invention belongs to the field of refractory materials technology, specifically relating to a spinel-graphite-metal composite material for core nozzles. First, a high-porosity resin-carbon bonded spinel-graphite preform is obtained by cold isostatic pressing followed by heat treatment in a protective atmosphere. Then, metallic silicon particles are used to embed the resin-carbon bonded spinel-graphite preform, which is then heat-treated in a vacuum sintering furnace. As metallic silicon permeates into the high-porosity resin-carbon bonded spinel-graphite preform, it continuously reacts with the resin-carbon and graphite, forming a dense silicon carbide layer from the surface to the interior, followed by a dense metallic silicon bonded spinel-graphite layer. With the formation of the dense silicon carbide layer on the surface, the permeation reaction ends, leaving a porous spinel-graphite layer in the core of the material. This invention avoids excessive thermal stress causing severe thermal shock that could lead to core nozzle fracture and failure, further optimizing the thermal shock resistance of the core nozzle.

This invention belongs to the field of pharmaceutical research technology, specifically relating to a marine cyclic peptide, its synthesis method, and its uses. The structural formula of the marine cyclic peptide is shown in Formula I. Compared with natural Galaxamide, the Galaxamide analog containing D-leucine provided by this invention exhibits a greater inhibitory effect on human cancer cells, and the more D-leucines introduced, the stronger the anticancer activity. Simultaneously, by replacing one of the L-leucines in Galaxamide with other amino acids, the synthesized Galaxamide derivative is more effective than natural Galaxamide and has the potential to inhibit the proliferation of human cancer cell lines HepG2, U87, and MCF-7.

The invention relates to the field of biological medicine, in particular to a chlorzoxazone preparation process which comprises synthesis of 2-nitro-4-chlorophenol, synthesis of a 2-amino-4-chlorophenol methanol solution, preparation of a chlorzoxazone crude product and refining of chlorzoxazone, the 2-nitro-4-chlorophenol can be synthesized at normal temperature and normal pressure by adopting p-chlorophenol with lower cost as a starting material, and the 2-nitro-4-chlorophenol can be used for preparing chlorzoxazone. The addition rate of hydrochloric acid is strictly controlled in the preparation of the crude product, urea byproducts generated by urea digestion can be avoided, impurity wrapping of the product can be reduced through hot filtration and slow cooling crystallization, the purity of the product is further improved, and in the refining link, activated carbon decoloration can adsorb small molecular impurities, and the purity of the product is improved. High-content impurities and trace single impurities can be removed through two times of crystallization, high-purity purification of the product is achieved, and meanwhile salt slag pollution generated by traditional acid-base refining is avoided.