| 摘要 |
<p>A pair of pressure pots (2,1) or pressure chambers are provided in which the blasting media is introduced for dispensing the media to conduits (11,12) leading to blasting guns. The media supply valves and air supply valves are controlled by a cam shaft assembly (54,70-74). Further, a metering hopper (3) having a media supply valve (31) is provided between the storage hopper (4) and upper pressure pot (2) or chamber. The media and air valves are operated in timed sequence as determined by the cam shaft assembly.</p> |
