| 摘要 |
The cleaner comprises at least one scraper having scraping segments which are made of elastic metal plates and are radially elongated around an axis of the scraper. A grinder is connected behind the scraper and has an ejection pipe which is rotatably supported by a tube and has at least one radially elongated portion having a nozzle at radially outer end. The grinder also has an electric motor for rotating the ejection pipe. The cleaner also has a hose which is connected behind the tube for supplying mixed flow of abrasive material and compressed air into the ejection pipe. A drive advances the scraper, the grinder and the hose.
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