4results about How to "Eliminate danger" patented technology

This invention relates to a pharmaceutical supply unit and a substrate processing system thereunder, as well as a pharmaceutical supply method. It discloses a technique for ensuring the reliability and stability of the process by sensing and removing impurities generated during a chemical reaction when a pharmaceutical solution is supplied through the pharmaceutical supply unit.

The application belongs to the technical field of medical intermediates, and relates to a production method of a clotrimazole intermediate (2-chlorophenyl)diphenylmethanol. In the method, 2-methyltetrahydrofuran or cyclopentyl methyl ether is used as a reaction solvent, an ethyl o-chlorobenzoate solution is added dropwise into a phenyl magnesium bromide solution with a concentration of 2.5-3.5 M under the conditions of 60-80 DEG C and inert atmosphere, the reaction is continuously carried out after the dropwise addition is completed, a water solution of a quenching agent is added after the reaction to quench, then, liquid separation is carried out, and the organic phase after the liquid separation is concentrated to obtain a crude product; the crude product is refined by using a reaction solvent and petroleum ether, and (2-chlorophenyl)diphenylmethanol is obtained. The production method can efficiently and stably produce high-quality (2-chlorophenyl)diphenylmethanol, reduces production cost and safety hazards, and can be used for large-scale industrial production.

The utility model discloses a special tool for drilling a hoop. The special tool comprises a base, a stop block, a positioning pin and an upper cover, a rectangular assembly groove used for installation of the check block is formed in the center of the upper end face of the base, and inserting grooves used for fixing the upper cover are symmetrically formed in the two sides of the rectangular assembly groove. When the clamp part is assembled, the fixing hole in the clamp part is aligned with the limiting pin hole in the side wall of the special-shaped boss of the check block, the positioning pin is inserted into the limiting pin hole, at the moment, the face-shaped part of the clamp part is attached to the special-shaped boss and is matched with the positioning pin to achieve alignment of the clamp part, and then the upper cover is buckled on the base. The clamp part is further pressed and locked through the upper cover, and then drilling operation of the clamp part is conducted in cooperation with drilling equipment.

This invention discloses an oil-free floor spring, i.e., a floor spring that operates without machine oil, relating to the field of floor spring technology. It includes a mounting box and a panel, the panel being fixedly mounted on the mounting box. A mounting base is fixedly mounted inside the mounting box, and a shaft cover plate is fixedly mounted on the mounting base. This invention achieves the effect of adjusting the extension and retraction speed of the telescopic cylinder by controlling airflow, thus avoiding the use of machine oil as the control medium. This solves the problems of existing floor springs, which, due to their annular oil circuit and use hydraulic oil as the control medium, may leak oil and lose performance after long-term use due to aging of seals or mechanical wear. This can cause the door to close too quickly due to uncontrolled movement, potentially injuring people. Furthermore, because the interior is filled with machine oil, there is a possibility of explosion, oil spraying, and combustion in the event of a fire, posing a danger to human life. Additionally, in extreme low-temperature environments, the viscosity of the oil may change, leading to excessively slow or stopped closing speeds.