| 摘要 |
<p>A work machine equipped with an automatic hammering function that is easy to operate and capable of preventing breakage of the hammer caused by blank firing is provided. Hydraulic oil fed to a hydraulic breaker 14 at the distal end of a work machine is controlled by first and second spools 33,34. Operating an operation lever 24 so as to contract single rod type boom cylinders 12bm to press the hydraulic breaker 14 against an object to be crushed. Head-side pressure Ph and rod-side pressure Pr of the boom cylinders 12bm are respectively detected by pressure sensors 44,45. Any one of switches 25,26,27 is used to switch the mode of automatic hammering operation between an automatic hammering inhibiting mode and an automatic hammering authorizing mode. In the automatic hammering authorizing mode, a controller 51 controls the first and second spools 33,34 of the hydraulic breaker 14 so as to open the spools 33,34 only when head-side pressure Ph and rod-side pressure Pr of the boom cylinders 12bm detected by the pressure sensors 44,45 are in a given range of pressing force.</p> |
