Mineral mining installation with electronic control
US4367900A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1981 |
| Grant date | Jan 11, 1983 |
| Priority date | — |
| Expiry date | Jan 19, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C35/302
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A shearer-type mineral winning machine has three-phase a.c. motors on its main body for driving cutting drums and for propelling the machine along a mineral face. The frequency of the a.c. power supplied to the motor which serves to move the machine is varied and controlled in dependence on the operation of the cutting drums. Electronic control means for monitoring the performance of the cutting drums and for controlling the frequency of the a.c. power supplied to the machine drive motor are located in a control station in a protected position in a gallery remote from the machine and power is supplied to the machine via cables and/or bus bars.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.