| 摘要 |
The mining machine is equipped with a position sensor composed of a revolving measuring wheel (28) with electro-magnetically readable marks, which moves along the mining path. Two inductive pulse generators (35) scan the marks of the measuring wheel, and a microprocessor (31) converts the produced signals to position- and/or movement direction signals which are transmitted by a radio instrument to shield control arrangement. The arrangement includes a number of hydraulically operated shields which are automatically controlled in dependence on the position of a mining machine, whereby the position of the mining machine is automatically notified to the shield control arrangement. The mining machine is equipped with a position sensor which is composed of a revolving measuring wheel (28), e.g. a pinion, with electromagnetically readable marks, which moves along the mining path. Two inductive pulse generators (35) scan the marks of the measuring wheel, and a microprocessor (31) converts the produced signals to position- and/or movement direction signals which are transmitted by a radio instrument. One or several radio receivers are distributed along the mining path, and are connected with the shield control arrangement for converting the position- and/or movement direction signals to control signals for the shields. |
