| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vibration machine which can suppress occurrence of resonance of a vibrator while suppressing load applied to a hydraulic motor of a vibration device. <P>SOLUTION: A vibration screen 100 is provided with a sieve device body 46 or the like elastically supported by a conveyer frame 20; the vibration device 48 vibrating the sieve device body 46 or the like ; a hydraulic drive unit 70 including a hydraulic motor 73 for the vibration device 48 and supplying working oil to the hydraulic motor 73; and a stop switch 63a2 indicating stop of the vibration device 48. The vibration device is provided with a controller 76 which has a function to decrease supply amount of the working oil to the hydraulic motor 73 on the basis of a predetermined reduction pattern when stop indication to the vibration device 48 is issued by the stop switch 63a2, and a function to intercept supply of the working oil to the hydraulic motor 73 when the number of revolutions of the hydraulic motor 73 detected by a revolution number detector 73a is smaller than a threshold value set to the number of revolutions higher than proper frequency of the sieve device body 46. <P>COPYRIGHT: (C)2012,JPO&INPIT |
