| 摘要 |
<p>The invention relates to an installation for heating preforms of thermoplastic materials of polyethylene-terephthalate-type, used for thermal conditioning of preforms in installations for manufacturing disposable containers of various shapes. According to the invention, the installation for heating thermoplastic preforms comprises a preform carrying table (B), supported on a vertical shaft (8) in a radial bearing (10), said table being entrained in a rotation movement by an electromechanical device (A) and provided with some support shafts (16) for thermoplastic preforms (20), located on a circular path (b), said shafts having mounted thereon some pulley wheels (17) at the lower end, while the electromechanical device (A) comprises an angular belt (2) which by means of the vertical shaft (8)sets the preform carrying table (B) in rotation movement and the pulley wheels (17) come into contact with a fixed belt (21) tensioned at the ends by an elastic element (22) which determines the rotation of the preforms (20) about their own axes, when they pass between some inner (28) and outer (29) guiding guards provided in front of some heating elements (25, 26, 27) located along the circular path (b) of the preform-carrying table (B).</p> |
