47results about How to "Prevent up and down" patented technology

The invention discloses a chromatography tank for artemisinin extraction and an efficient pressurized chromatography method thereof and belongs to the field of artemisinin extraction equipment and methods. The chromatography tank comprises a tank body, a gasoline inflow pipe, an extracting solution inflow pipe and an eluent inflow pipe. A feeding gate is arranged on the top of the tank body. A discharging door is arranged on one side of the lower portion of the tank body. A material supporting screen is arranged on the lower portion in the tank body. A compressed air inlet and an air blowoff valve are arranged on the top of the tank body. The bottom of the tank body is connected with a main discharge pipe, a main valve is arranged on the main discharge pipe, the lower end of the main discharge pipe is communicated with an agent checking transfer tank, and the transfer tank is connected with multiple classification discharge pipes. The efficient pressurized chromatography method includes the steps of A, material preparation; B, whole column liquid level reducing; C, column feeding; D, first pressurizing extracting solution liquid level reducing; E, second pressurizing eluent liquid level reducing; F, eluting without an agent; G, eluting with the agent; H, third pressurizing eluent liquid level reducing. The agent content of eluent can be precisely detected, washing liquor is recovered in a classified mode, the utilization rate of the washing liquor containing the agent is increased, and the production period is shortened.

The invention discloses a construction method for consolidation of a steel box girder and a concrete pier of a swivel rigid-frame bridge. The construction method is implemented at the following steps: 1, pre-burying prestressed steel bars when an upper rotary table or the concrete pier is constructed, when the concrete pier is constructed, an outer wrapping force transfer steel plate on the outer surface of the concrete pier, fixedly connecting shear studs II to the inner side of the outer wrapping force transfer steel plate, and preserving a pier top post-pouring section at the top of the outer wrapping force transfer steel plate; 2, after the steel box girder is in place, welding the outer wrapping force transfer steel plate and a web plate and a diaphragm plate of the steel box girder together, welding a bearing plate into the steel box girder, forming a combined concrete pouring section below the bearing plate, and fixedly connecting shear studs I to the inner sides of the web plate and the diaphragm plate of a to-be-poured pouring section; pouring micro expansion concrete; and 4 after the micro expansion concrete reaches the design strength, tensioning the prestress steel bars and anchoring the upper ends of the prestress steel bars on the bearing plate, and then completing duct grouting. According to the invention, the actual stress requirement of a small-radius curve steel box girder can be met and the safety of the bridge is improved.