| 摘要 |
PURPOSE:To detect simply and surely a level of a coal layer in a coal pipe, by inserting a push rod into a coal pipe from a side wall crossing at right angle to each other and deciding the level whether the rod is moved with a fixed stroke within the set time or not. CONSTITUTION:An opening 2 is provided to a side wall of a coal pipe 1 at a part upper than a level of the lowest limit of the coal layer and a push rod 7 sealed with a sealing box 4, a sealing member 5 and a press metallic fitting 6 etc. is inserted into the pipe 1 crossing at right angle to each other through a cylinder 9 for sending necessary pressurized air. And, when the rod 7 is moved with a prescribed stroke within the set time and a limit switch 11 is interlocked with said movement via a striker 10, it is decided that the coal layer in the pipe 1 is not reached to a prescribed level and a control signal for coal sent out quantity is generated. On the other hand, when the extent of movement of the rod 7 is not reached the prescribed stroke within the set time, it is detected that the coal layer in the pipe 1 is attained to the prescribed level. By this construction, it is detected simply and surely that the coal layer in the pipe 1 is in a fixed level or not. |
