| 摘要 |
FIELD: jet treatment of surfaces. ^ SUBSTANCE: case of boiler unit is connected by means of single-axis hinges with central parts of two parallel three-hinged connecting-rods. Axes of hinges and axis of nozzle belong to the same plane. Ends of connecting rods are connected with ends of two levers by single-axis hinges. Other ends of levers are connected with foundation by means of two-axis hinges. Common axis of these hinges crosses center of opening in foundation. Hinges are placed onto foundation in such a way that axis of nozzle crosses center of opening. Case, connecting rods, levers and foundation all together form flat-hinged n-tier model, which is formed by parallelograms. The n-tier model is capable of turning about axis (i.e. it has two degrees of freedom), that's why nozzle has two degrees of freedom and its axis crosses center of opening at any position. ^ EFFECT: reduced wear of items of nozzle unit; easiness at control of drives of unit. ^ 3 cl, 5 dwg |
