| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to eliminate the need for a large-sized pressure resistant tank, to utilize a small-capacity pressure source and to execute pressurization in a short period of time. SOLUTION: A cleaning means having an injection nozzle 67 for a washing liquid is mounted at the front end of a boom. The large-sized tank 9L in which the washing liquid is stored is mounted on a car body. A small-sized tank 9M into which the washing liquid in the large-sized tank 9L is dropped and supplied by gravity is mounted at the car body. The pressure source 9R for forcibly feeding the washing liquid in the small-sized tank 9M to the washing nozzle 67 used in common with a pressure source 9R of an air cylinder 81 of the cleaning means is connected to the small-sized tank 9M. A selector valve 95 is interposed to a piping 94 for connecting the small-sized tank 9M to the injection nozzle 67. The inflow port of this selector valve 95 is connected to the small- sized tank 9M and one of the outflow ports thereof to the injection nozzle 67, respectively. The other outflow port is opened to the atm. via a silencer 96. |
