| 摘要 |
<p>In a tunnel kiln wet shaped articles 2 arranged in vertical layers and horizontal rows travel from left to right through drying zone 6 and pre-heating zone 5 to firing zone 4. They then return in the opposite direction, and are cooled by the transfer of heat to the incoming articles. Alternate conveying rollers 3 rotate in opposite directions and each roller has a varying diameter to contact only the articles which are to be driven in the corresponding direction. Each article is transferred laterally at the end of the firing zone to engage with the rollers rotating in the opposite sense. Hot and cold articles travelling in opposite directions thus alternate in the horizontal plane as well as in the vertical plane. In an alternative arrangement the firing zone is at the centre and wet articles travel from both ends of the tunnel and emerge from the opposite end after cooling. <IMAGE></p> |
