Pipe scale scraping tool - has spring mounted around power supply line to prevent motor rotating as tool rotates

摘要

A device for scraping scale etc. from the inside of pipes has a rotary scraper blade mounted on a drive motor (4), which is pushed into the pipe. A tempered steel coil spring (5) is mounted around the supply line (6) to the motor to prevent it rotating. The supply line may be an air supply for a pneumatic motor or a liquid supply for a hydraulic engine, or supply leads for an electric motor. The inside diameter of the spring is greater than the outside diameter of the supply line. The coils are wound in the opposite direction to the direction of rotation of the motor. The diameter of the steel wire is between 5 and 10 mm and the inside diameter of the spring is between 20 and 40mm.