| 摘要 |
Systems and methods for remotely altering operation of a horizontal directional drilling machine provide for remotely disabling movement of a drill string coupled to a cutting head or reamer and, in addition, disabling dispensing of fluid, foam and/or air communicated through the drill string. A lockout signal is transmitted from a portable or hand-manipulatable remote unit operated by an operator remotely situated with respect to the drilling machine. The lockout signal is received at the drilling machine. In response to the received lockout signal, a controller of the drilling machine prevents movement of the drill string and thus the cutting head or reamer. The controller also disables dispensing of fluid, foam and/or air through the drill string in response to the received lockout signal. The controller effects transmission of a verification signal from the drilling machine to the remote location. The verification signal indicates successful receipt of the lockout signal by the drilling machine, disablement of drill string movement and, if applicable, disablement of fluid, foam and/or air supply through the drill string. The remote unit, in response to the verification signal received from the drilling machine, communicates to a user of the remote unit one or more of a visual, audible, and/or tactile indication that the verification signal has been received, thus providing unambiguous assurance to operators working on or proximate the drill string/cutting head that all drill string/cutting head movement and fluid dispensed through the drill string has been successfully disabled. |
