41results about How to "Avoid local stress" patented technology

The utility model relates to a non-contact liquid-jet grinding head for gas-sealed liquid pumping for numerical control polishing, which belongs to the liquid-jet grinding head involved in the technical field of optical cold processing. The technical problem to be solved is to provide a non-contact liquid jet grinding head for gas-sealed liquid pumping for numerical control polishing. The technical solutions to be solved include hollow grinding head, polishing liquid outlet hole, collecting plate connecting frame, polishing liquid collecting plate, air inlet hole, air curtain groove, liquid pumping hole, liquid collecting tank, etc.; the polishing liquid collecting plate connects with the collecting plate connecting frame The shaft sleeve of the grinding head is fixedly connected and set on the hollow grinding head; the first air inlet hole of the polishing liquid collecting plate communicates with the first air curtain groove, and the first air curtain groove communicates with the gap between the hollow grinding head and the polishing liquid collecting plate; The second air inlet hole of the polishing liquid collecting plate communicates with the second air curtain groove, and the second air curtain groove communicates with the lower working surface of the polishing liquid collecting plate; The liquid pumping hole communicates with the space outside the polishing liquid collection plate; the polishing liquid outlet holes are distributed on the working surface of the hollow grinding head.

A non-contact liquid-spraying grinding head for the numerally controlled polishing is composed of a hollow drive shaft and a hollow grinding head with an internal cavity and several polishing liquid spraying-out holes. Its advantages are high polishing quality.

A steel pipe concrete pouring exhaust device and its construction method, including a fixed frame, an exhaust pipe and a lower cone head; the fixed frame is T-shaped, including a horizontal bar and a vertical bar; Inserted in the steel pipe, the length of the exhaust pipe is adapted to the height of the concrete to be poured; the upper end of the exhaust pipe is sleeved on the vertical bar, and is connected with the vertical bar through the first bolt; on the wall of the exhaust pipe, There are exhaust holes spaced apart vertically, and the exhaust holes are inclined holes that gradually slope downward from the inside to the outside; the lower cone head is set at the bottom of the exhaust pipe and is conical; the tip of the lower cone head faces downward ; There is a connecting short rod in the middle of the top of the lower cone head; the connecting short rod is plugged into the lower end of the exhaust pipe and connected with the exhaust pipe through the second bolt. The invention solves the technical problems of cumbersome construction, uneven concrete pouring, uneven concrete pouring and uneven local stress at the vent hole of the steel column wall existing in the traditional construction method of pouring concrete.