Method of and apparatus for conveying powdered or granular material
US4681484A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1985 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Jan 16, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65G53/4616
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A rotor (1) of a machine for spraying concrete, mortar or a refractory lining material comprises conveying chambers (11') arranged concentrically around its axis, and delimited by cylindrical walls (11) of a porous, air-permeable material, the inside of the walls (11) being machined smooth. Each cylindrical wall (11) is surrounded by an air chamber (10), each of which is acted upon, between a charging point (26) and a discharge point (27), by the pressure of a compressed air source (32) so as to produce air flows which pass through the porous walls (11) into the conveying chambers (11'). The material to be conveyed by the conveying chambers (11') between the charging point (26) and the discharge point (27) is at least in the regions close to the wall acted upon by these air flows so as to prevent the material from adhering to the chamber walls (11'). The discharge through the discharge opening (27) into a conveying line (30) takes place essentially by gravity and by the action of an injector nozzle (31). Since the air flows supplied through the chamber walls (11) are only small, the action of the injector nozzle (21) is not disturbed by compressed air surges, so that a uniform conv…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.