| 摘要 |
The high-pressure mixing apparatus, for reactive chemical components, comprises a device (18, 22, 23) for self-lubricating and scraping the outlet duct (13) of the chemical mixture, and flushing out the scraped residues. The self-lubricating and scraping device comprises a delivery chamber (22) for the lubricant material axially aligned and in fluid communication with the outlet duct (13); the lubricant delivery chamber (22) is connected to a storage tank (23) by a feeding and re-circulation circuit (24A, 24B). The lubricant is sucked into the outlet duct (13) and subsequently returned into the delivery chamber (22) by a cleaning member in the form of a pumping piston (18) sliding into the outlet duct (13), the pumping piston (18) being provided with scraping rings (35, 37) for removing the reacted mixture adhered to the inner surface of the outlet duct (13). |
