| 摘要 |
<p>PURPOSE:To enable the hydraulic hoist to be used at higher pressures by a method wherein a pressure equalizer is fitted to a supply pipe and the pressure in the supply pipe is regulated to make the pressure in the pipe equal to the external pressure. CONSTITUTION:A high-pressure fresh-water pump 5 and a slurry pump 2 are provided at one side of the supply pipe 1. After filling a slurry into the pipe 1, clean water is fed into the pipe 1 and the slurry is fed into a coveying pipe 10 under pressure. The slurry is fed into the supply pipe 1 by opening valves 4, 13, then the valves 4, 13 are closed and the pressure in the pipe 1 is increased to the pressure in a pipe 6 by the pressure equalizer 15. Thereafter, valves 7 and 9 are opened and the slurry is fed under pressure into the conveying pipe 10 by the high-pressure fresh water. Accordingly, the regulation of pressure and the operation can be controlled easily.</p> |
