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139results about How to "Removed smoothly" patented technology

Semi-aromatic transparent polyamide preparation method and semi-aromatic transparent polyamide

The present invention discloses a semi-aromatic transparent polyamide preparation method and semi-aromatic transparent polyamide. According to the present invention, an acid-alkali neutralization reaction is performed in a polar aprotic solvent, the reaction product semi-aromatic polyamide salt has poor solubility in the polar aprotic solvent, and the product polyamide salt can be precipitated from the reaction mixing liquid after the reaction, such that the semi-aromatic transparent polyamide salt is easily separated from the reaction mixing liquid, and the purity of the semi-aromatic transparent polyamide salt is high; the solid semi-aromatic transparent polyamide salt is subjected to the polymerization reaction, such that the problem that the reaction raw material ratio is difficult to control in the prior art is solved; and the polymerization reaction of the invention is divided into three stages such as the pressurization reaction stage, the normal pressure reaction stage and the pressure reducing reaction stage, wherein the condensation polymerization reaction by-product can be smoothly removed from the reaction system in the pressure reducing reaction stage, such that the reaction balance can easily move to the forward direction so as to obtain the high molecular weight semi-aromatic transparent polyamide.
Owner:CHANGSHU RES INST OF DALIAN UNIV OF TECH CO LTD

Yarn conveying and winding mechanism

The invention discloses a yarn conveying and winding mechanism and belongs to the field of textile processing machinery and equipment. The yarn conveying and winding mechanism comprises a winding bracket, a yarn feeding wheel, a yarn guide wheel, a yarn adjusting mechanism, a rotary circular plate, winding rods and a winding motor, wherein the yarn feeding wheel is vertically and rotatably connected with the winding bracket; the yarn adjusting mechanism comprises a rotary adjusting plate, adjusting wheels and a rotary hydraulic cylinder; two ends of the rotary adjusting plate are respectively, vertically and rotatably connected with the adjusting wheels; the rotary hydraulic cylinder is arranged between the rotary adjusting plate and the winding bracket; a translation screw rod is in threaded connection with a translation plate; the yarn guide wheel is vertically and rotatably connected with the upper side of the translation plate; and a translation motor drives the translation screw rod, the winding motor drives the rotary circular plate, and one side of the rotary circular plate is horizontally and uniformly provided with multiple winding rods. The yarn conveying and winding mechanism is reasonable in structural design, is capable of quickly, efficiently, uniformly and orderly conveying and winding yarns, and meets the demands of production and use.
Owner:ZHEJIANG ZHONGSHI MACHINERY CO LTD

Efficient chip cutting method

The invention relates to an efficient chip cutting method, which comprises the following steps: cleaning the surface of a substrate, and fully pasting a double-sided UV film onto a cutting area; placing a to-be-cut chip on the substrate and fixing the to-be-cut chip in the cutting area through the double-sided UV film; placing the substrate on a workbench of a cutting machine, and cutting the to-be-cut chip along a cutting auxiliary line on the to-be-cut chip until the to-be-cut chip is completely cut off; taking the substrate down from the workbench of the cutting machine, and cleaning and blow-drying the substrate; illuminating the substrate to make the double-sided UV film lose viscosity, and taking down single chips after cutting one by one. Because the double-sided UV film is arrangedon the substrate, the to-be-cut chip can be fixed on the substrate, and it is ensured that the position of the chip is relatively fixed during cutting. After cutting is completed, the double-sided UVfilm loses viscosity through illumination, and single chips are directly taken down and do not need to be cleaned through a chemical solvent. Therefore, the period of the cutting process is shortened, the cutting efficiency is improved, and the cutting precision and the cutting quality can be guaranteed.
Owner:WUHAN YILUT TECH CO LTD

Grinding device for small-diameter optical lens

The invention belongs to the technical field of machinery, particularly relates to a grinding device for a small-diameter optical lens. The grinding device aims at solving the problem that in the prior art, a lens and a rubber layer are difficult to take down after being tightly extruded due to the structure of the grinding device for the optical lens for fixing the lens. According to the technical scheme, the grinding device comprises a fixing base with the upper end fixedly connected with an L-shaped fixing seat; a lens fixing mechanism comprises a first motor, a first electric push rod, a first clamping piece, a second clamping piece, a two-way suction cup and a second electric push rod; and the grinding assembly comprises a butterfly surface grinding rod. According to the grinding device for the small-diameter optical lens, the upper and lower edges of the optical lens can be formed through the arranged butterfly surface grinding rod, later reprocessing is avoided, and procedures are saved; through the arrangement of the two-way suction cup, the closed space formed between the rubber layer and the optical lens is freely opened and sealed, so that the suction force between the rubber layer and the optical lens is changed, and the optical lens is conveniently and stably placed and smoothly taken down.
Owner:付小毛

Conveniently-dismounted high-capacity rare-earth lithium battery module used in high-low-temperature range

The invention discloses a conveniently-dismounted high-capacity rare-earth lithium battery module used in a high-low-temperature range. The conveniently-dismounted high-capacity rare-earth lithium battery module is characterized in that a rare-earth lithium battery cell of the conveniently-dismounted high-capacity rare-earth lithium battery module used in a high-low-temperature range is installed in a support of a detachable spliced structure, and the support is divided into an upper layer and a lower layer; a conducting wire connecting piece is welded to a rare-earth lithium cell part and fixed to the support part by virtue of a bolt. By adopting the conveniently-dismounted high-capacity rare-earth lithium battery module, the single rare-earth lithium battery cell is replaced under the situation that the single rare-earth lithium battery cell is damaged, and the battery can be used normally. The battery does not need to be rejected integrally, and the unnecessary waste can be avoided; the single rare-earth lithium battery cell part with a fault can be successfully dismounted, a good single rare-earth lithium battery can be replaced, finally the rest part can be used continuously, and thus simplicity and economical efficiency in replacement can be realized. The conveniently-dismounted high-capacity rare-earth lithium battery module can be used in an environment of -43 to 65 DEG C and has the advantages of wide high-low-temperature application range, high capacity, small internal resistance, long service life, high efficiency, controllability of current output, and the like.
Owner:QINGHAI GREEN GRASS OF TECH CO LTD

Preparation method of mullite whisker reinforced aluminum-based ceramic core for directional solidification

The invention discloses a preparation method of a mullite whisker reinforced aluminum-based ceramic core for directional solidification. The preparation method comprises the following steps: mixing fused corundum powder used as raw material of ceramic core matrix, aluminum hydroxide powder, yttrium oxide powder, nano silicon dioxide powder, aluminum trifluoride powder and surface-treated lignin fibers for improving the porosity of the mold core, stirring and mixing with a molten plasticizer to obtain mold core slurry, and pressing to obtain a ceramic mold core blank; putting the ceramic core blank into magnesium oxide powder, carrying out four-stage sintering to burn off lignin fibers and improve the porosity, finally, carrying out impregnation with yttrium oxide sol, and then, carrying out roasting strengthening so that aluminum hydroxide and nano silicon dioxide in the ceramic core blank generate mullite whiskers in situ under the catalysis of aluminum trifluoride; therefore, the mullite whisker reinforced aluminum-based ceramic core for directional solidification of turbine blades of aero-engines and gas turbines is obtained. The obtained ceramic core can bear the high temperature of 1,550-1,700 DEG C in the directional solidification process of hollow turbine blades of large-size aero-engines and gas turbines, is small in deformation and does not crack under the high temperature gradient.
Owner:SHANGHAI JIAO TONG UNIV +1
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