| 摘要 |
<p>PCT No. PCT/DE93/01259 Sec. 371 Date Jul. 28, 1995 Sec. 102(e) Date Jul. 28, 1995 PCT Filed Dec. 29, 1993 PCT Pub. No. WO94/16819 PCT Pub. Date Aug. 4, 1994A pneumatic jigging screen device has an air chamber for generating pulsation which is connected to a compressed air source. An air outlet is provided. An air inlet valve in the form of a disk valve is connected between the compressed air source and the air chamber and includes a valve rod. An air outlet valve in the form of a disk valve is connected between the air chamber and the air outlet and includes a valve rod. A first pneumatic valve drive is coupled to the valve rod of the air inlet valve. A second pneumatic valve drive is coupled to the valve rod of the air outlet valve. A first electromagnetic control valve is connected between the first pneumatic valve drive and the compressed air source. A second electromagnetic control valve is connected between the second pneumatic valve drive and the compressed air source.</p> |
