| 摘要 |
PCT No. PCT/GB94/01164 Sec. 371 Date Jan. 24, 1996 Sec. 102(e) Date Jan. 24, 1996 PCT Filed May 27, 1994 PCT Pub. No. WO94/27786 PCT Pub. Date Dec. 8, 1994A blast wheel assembly has a bladed rotor and an impeller which rotate together. A cage has an axial and angular wall including an aperture through which in use particulate material passes. The cross section of the aperture is irregular to control the uniformity of blast effect on a surface being treated. The assembly can be in a mobile or static machine. Various forms of aperture are described, the preferred form of which is of non-uniform shape as it extends angularly with respect to the cage axis, the aperture being of less cross-section in a region intermediate the angular end regions of the aperture.
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