| 摘要 |
A pressure gauge (2) is provided on the exterior of the body to indicate a depth position signal. An indicator (7) probes the force exerted by the body on the object to be moved, and emits a force signal. A control arrangement is connected to both the pressure gauge and the indicator. The depth position signal and a theoretical position signal are inputted to a primary comparison circuit (3) in order to emit a theoretical force signal. This signal together with the actual force signal, is connected to a further comparison circuit (8) in order to provide a control signal which activates the feed and evacuation of lifting gas. In the gas volume is fitted a second pressure gauge to emit a secondary pressure signal. The pressure together with the force signals, are inputted to a weighing circuit to produce a weighed signal of variable dimension or on the one hand the force signals, and on the other hand a linear combination of the two pressure signals. The weighed signal and that for theoretical force are coupled to the input of the second comparison circuit. (Provisional basic advised week 86/31) |
