| 摘要 |
<p>Minute charges of the material are carried by high pressure jets of liquid, such as water, down into the ground from a series of side-by-side nozzles (158) that simultaneously fire the jets toward the ground at regular intervals as the nozzles (158) advance along a path of travel. During the short pauses between successive blasts from the nozzles (158), material is continuously fed into a collecting chamber (240) for each nozzle (158) to form a small charge (242). As the water blast takes place, the charge (242) is automatically drawn into the venturi and carried out of the machine by the high pressure jet. An onboard computer controls firing of the nozzles in relation to speed, distance and desired application rate, as well as other variables, and an optional embodiment provides a similar degree of control and precision for liquid additive materials.</p> |
