33results about How to "Effective break" patented technology

The invention discloses an anti-drop and rat-proof board, comprising a rat-blocking part, a mounting part for installing the rat-blocking part, and a monitoring part. The second mouse blocking plate, one end of the first mouse blocking board away from the second mouse blocking board is provided with a safety pin fixing piece, the safety pin fixing piece 1 is installed on the upper and lower ends of one side of the first mouse blocking mouse board, and the safety pin fixing piece A safety pin shaft is connected between the two safety pin fixing parts, a proximity switch is arranged on the door frame, a proximity switch block is arranged on the first mouse-blocking plate close to one side of the door frame and opposite to the proximity switch, and the proximity switch is electrically connected with an alarm buzzer. buzzer and warning light; the invention adjusts the nested second anti-rat boards to adapt to different widths according to the width of the door frame of different power distribution rooms, and is fixed; a fracture stress adjustable safety pin is set at the corresponding position as a safety device to prevent Causing people to trip and fall; set and install proximity switches for position detection to prevent small animals from taking the opportunity to enter.

The invention provides a grinding wheel for gallium arsenide crystal thinning, a preparation method and application. The grinding wheel is provided with a porous structure, and is prepared from the following raw material of, in percentage by weight, 10%-35% of diamond abrasive, 15%-42% of polyimide resin powder, 5%-20% of foaming agent, 5%-20% of calcium fluoride, 3%-15% of molybdenum disulfide, 8%-30% of white corundum and 5%-12% of zinc oxide. The grinding wheel is of the porous structure, a binding agent bridge established through the porous structure generates effective breakage during grinding, the self-sharpening performance of the grinding wheel is good, and the trimming frequency is reduced; a damaged layer on the surface of a gallium arsenide wafer is reduced, pressure is reducedfor a subsequent polishing process, and the periodic production efficiency is improved; and a molybdenum disulfide solid lubricant material is added into a grinding wheel system so that the friction coefficient of the grinding wheel can be reduced, the grinding heat is effectively reduced, the probability of workpiece burning is reduced, and the surface quality of the gallium arsenide wafer is improved.

The invention discloses an anti-broken needle device of a standard matching instrument, which comprises a base, a fixed plate, a slider, a liquid transfer needle, a position detection device and a flexible positioning device, and a device for the slider to go up and down is arranged between the fixed plate and the base. A sliding slide, the slide is installed in the slide, the pipetting needle is fixed at the bottom of the slide, and the flexible positioning device is used to apply a lateral contact force to the slide, so that the slide is fixed in the slide. The flexible positioning device includes a positioning ball, a positioning spring, and a positioning groove arranged on the side of the slider to match the positioning ball. A horizontal sliding hole is provided on the fixing plate, and the positioning ball can be freely slidably installed in the horizontal sliding hole for positioning. One end of the spring is in contact with the positioning ball, and the other end is fixed in the horizontal sliding hole. The elastic force of the positioning spring makes the positioning ball keep the pretightening force stuck in the positioning groove. The present invention can detect the deviation of the pipetting needle in time, can feedback the abnormal operation of the pipetting needle in time, and effectively prevents the abnormal breakage of the pipetting needle.

The invention discloses thermochemical modified starch, a preparation method and a method for preparing an adhesive by using the thermochemical modified starch and relates to modified starch and adhesives prepared by using the starch. The method is used for solving the technical problems of the existing starch adhesives that the water resistance is not ideal, the transportation cost is high, and the starch modification process is complicated. The thermochemical modified starch is prepared through uniformly spraying an acid solution into the starch, carrying out uniform mixing, then, carrying out heating treatment, carrying out baking, carrying out cooling, and then, carrying out crushing. The method for preparing the adhesive comprises the following steps: adding polyvinyl alcohol into a reactor pot with stirring, heating and cooling devices, adding water, adopting a staged-heating method to dissolve the polyvinyl alcohol with stirring, and then, cooling to room temperature; adding the thermochemical modified starch, carrying out stirring at room temperature, and then, adding polymethylene polyphenyl polyisocyanate, thereby obtaining the adhesive. According to the method, by using the technological characteristic that the starch-based adhesive is prepared by only adding the water to the thermochemical modified starch before use, the problem that the traditional solution type starch main agents are low in transportation efficiency and are prone to layering and mildewing is solved.