51results about How to "Suitable for standardization" patented technology

The invention discloses a complete dropper prefabrication platform for a high speed railway overhead line system. The complete dropper prefabrication platform includes a rotatable fixing rod, a hydraulic clamp, a fixing block, a graduated scale, wire clippers, a sliding module and extrusion flat steel, the tip of the hydraulic clamp is welded and fixed at the top of the platform, the rotatable fixing rod is positioned on one side of the hydraulic clamp, the graduated scale is positioned on the other side of the hydraulic clamp, the sliding module is positioned on one side of the graduated scale and parallel to the graduated scale, the wire clippers are positioned on the side, far from the graduated scale, of the sliding module, and the wire clippers are fixed on the side, far from the rotatable fixing rod, of the hydraulic clamp. Through the reasonable layout of the hydraulic clamp, the wire clippers, the fixing block, the graduated scale, the sliding module and other functional modules on the platform, a complete dropper for the overhead line system is fabricated conveniently and accurately; since the whole prefabrication process is simple and easy to learn, an ordinary worker is capable of mastering the crimping essentials in 10 min and performing prefabrication independently, so that the efficiency and quality of the complete dropper prefabrication construction are enhanced. The complete dropper prefabrication platform is suitable for standardized and industrialized production.

The invention discloses a method for derivatization chromatographic analysis of residue semicarbazide in flour and a flour product. The method comprises the following steps: (1) enabling semicarbazide and a derivatization reagent to react, using HPLC / UV (High Performance Liquid Chromatography / Ultra Violet) to detect, and drawing to obtain a standard curve, wherein the standard curve takes the concentration of semicarbazideas an x-coordinate and takes the characteristic peak area of a derivatization product as a y-coordinate; (2) taking a to-be-detected sample, implementing ultrasonic extraction by using an extraction agent, centrifuging to obtain a supernate, adding the derivatization reagent and a precipitator into the supernate, centrifuging to obtain a supernate, filtering the supernate through an organic filter membrane to obtain a filtrate; (3) detecting the filtrate obtained in the step (2) through HPLC / UV, reading the characteristic peak area of the derivatization product, and contrasting with the standard curve to obtain the content of the semicarbazide in the to-be-detected sample. Compared with the prior art, the derivatization reagent strengthens the ultraviolet absorption of the derivatization product, and the detection is facilitated; in addition, a detection instrument is simple and common, the detection cost is low, the rapid detection of the semicarbazide is facilitated, and the method is applicable to large-scale sample detection and is suitable for standardization.

The invention relates to a curved-surface bow-shaped folded-plate tube shell type heat exchanger. The invention comprises a heater exchanger tube. The heater exchanger tube is connected with tube plate, and is provided inside with a the tube bundle passing through a group of tube holes of the bow-shaped folded plate and are fixed between the tube plates in the way of being parallel to axis; the folded plate is evenly fixed by the drawbar and the distance-fixed tube along the axis parallelly; the drawbar and the distance-fixed tube are fixed on the tube plate, the outer side of which is connected with tube box; the bow-shaped folded plate is the curved-surface bow-shaped folded plate, the outer convex side of which is directed at the inlet of the shell-process fluid; a group of bow-shaped folded plate gaps is arranged in a staggered way at intervals from top to bottom horizontally or from left to right vertically in order to form the circuitous flow channel of the fluid inside the tube. The heat exchanger of the invention has the advantages of improving the flow-speed distribution of the shell-process fluid of the bow-shaped folded plate, effectively increasing the circulation area, reducing 'dead zone', obviously improving the efficiency of the heat exchange and reducing the drop of the pressure in comparison to the flat-plated type bow-shaped folded plate.