| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an exhaust gas purification device of a construction machine which, in defrosting a liquid reducing agent, can defrost the same in a manner that keeps down application of heat to an already defrosted liquid reducing agent.SOLUTION: An exhaust gas purification device comprises: an exhaust gas post processing device 12 which purifies exhaust gas from an engine 11 in accordance with urea water solution supplied thereto; a urea water tank 13 which stores the urea water solution; supply piping 20 which supplies the urea water solution to the exhaust gas post processing device 12; a heat exchanger 14 which is arranged inside the urea water tank 13 and includes defrosting piping 21 exchanging heat between engine cooling water circulated therein with the engine 11 as a heat source and the urea water solution stored in the urea water tank 13 and a holding body 22; and a heat exchanger rotating device which includes a heat exchanger transfer device, for example a motor 33 and gears 32 and 31, to enable the heat exchanger 14 arranged inside the urea water tank 13 to be transferred within the same in a manner that rotates the heat exchanger 14 with a virtual rotation axis 30 as a shaft center.</p> |
