F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
121/22
F15B 9/10 (2006.01) E21B 15/04 (2006.01)
Patent
CA 1103115
A B S T R A C T Directional valve means position machine units such as rock drill- ing machines by the aid of pressure fluid driven positioning motor means and a directional valve for controlling the pressure fluid supply thereto. A machine unit is to be angularly positioned about a first pivot axis relative to an outlying boom frame means which in its turn is angularly adjustable about a second axis relative to supporting means. The directional valve is included in an angle setting servo system incorporating n control unit which under movement of the boom frame means automatically governs the positioning motor 50 as to cause the machine unit to maintain its direction in the sur- rounding space in relation to a predetermined set angle value therefor. The directional valve comprises a first element incorporating valve housing means and as a second element incorporating cooperating valve body means which are adjustable relative to said valve housing means. These elements are syngonously (uniangularly) related one of them to the actual angle value of the machine unit and the other to the set angle value therefor. The direc- tional valve in itself forms the control unit in that its elements have a fe?d back position defined by cooperating valve surfaces thereof. In the feed back position the pressure fluid supply to the positioning motor is cut down or cut off when the actual angle value coincides with the set angle value. The syngonous relationship is provided by an angle transmission for trans- mitting the actual angle value or the set angle value to the directional valve to or from a fixed position in the surrounding space remote from the machine unit.
305814
Atlas Copco Aktiebolag
Fetherstonhaugh & Co.
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