Abstract: A portable minimally invasive surgical mechanical arm with multi-degree of freedom comprises a handle joint assembly which is used for movably mounting an axle part, and the assembly comprises a first axis and second axis allowing the axle part to rotate around the first axis and the second axis respectively. The first axis coincides with the axis of the axle part, and the second axis is perpendicular to a shaft. A controlling mechanism and a controlling wire joint assembly are used for transmitting the motion of the grip part to the controlling wire joint assembly. The controlling mechanism comprises an input piece, two push rods and an output piece, and the two push rods. The input piece receives the output motion of the axle part, and the output piece is part of the controlling wire joint.

Abstract: A portable minimally invasive surgical mechanical arm with multi-degree of freedom comprises a handle joint assembly which is used for movably mounting an axle part, and the assembly comprises a first axis and second axis allowing the axle part to rotate around the first axis and the second axis respectively. The first axis coincides with the axis of the axle part, and the second axis is perpendicular to a shaft. A controlling mechanism and a controlling wire joint assembly are used for transmitting the motion of the grip part to the controlling wire joint assembly. The controlling mechanism comprises an input piece, two push rods and an output piece, and the two push rods. The input piece receives the output motion of the axle part, and the output piece is part of the controlling wire joint.

Abstract: The invention discloses a pulsating chlorination machine for purification of city water. The machine includes a body, two ends of which are respectively a water inlet and outlet end between which a converging pipe, a throat pipe and a diverging pipe are connected in turn; and a liquefied chlorine input port located below a middle part of the throat pipe and connecting with the throat pipe via a cone-shaped valve seat. A normally closed cone-shaped valve rod is mounted over the cone-shaped valve seat and inserted into the throat pipe through a vertical circular hole on a top of the body, and moves up and down under the control of a pulsating electromagnetic executive mechanism to open/close the liquefied chlorine input port. Through the liquefied chlorine input port the liquefied chlorine flows into the throat pipe and out from the diverging pipe and then into a clear-water reservoir.

Abstract: A direct chlorination system and device characterized by feeding of liquefied chlorine into water without vaporization in a process that liquefied chlorine from a source liquefied chlorine cylinder is led to a liquefied chlorine settlement cylinder for removal of solid impurities, a metering pump for a pressurization and flow rate control at the metering pump and a liquefied chlorine feeder for mixing with and dissolving in pressurized water to become a high concentration chlorine solution which is then led to a water injector for feeding into a rapid water filter, a mixing basin and a clearing water reservoir for reaction and disinfection before city water is sent to a city water distribution network, and possessing the following merits: upgrading potable water quality, minimizing initial investment, lowering operating cost, and providing a simply but reliable, easy-to-control device that can facilitate water works automation.