| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve work efficiency by reducing the frequency of supply of urea aqueous solution by storing plenty of urea aqueous solution at a time. <P>SOLUTION: An auxiliary tank 23 for storing urea aqueous solution is arranged separately from an existing urea aqueous solution tank 20 for storing urea aqueous solution to be supplied to an urea aqueous solution spray nozzle 19F of an NOx emission control device 19. The auxiliary tank 23 is made to communicate with the urea aqueous solution tank 20 through communication piping 24, and is structured to arrange a selector valve 25 at an intermediate part of the communication piping 24 to achieve communication/cutoff between the auxiliary tank 23 and the urea aqueous solution tank 20. Accordingly, the communication piping 24 is made to communicate by opening the selector valve 25 when the urea aqueous solution in the urea aqueous solution tank 20 decreases, thereby the urea aqueous solution in the auxiliary tank 23 can be supplied to the urea aqueous solution tank 20 through the communication piping 24, and a hydraulic shovel 1 can be continuously operated. <P>COPYRIGHT: (C)2013,JPO&INPIT |
