Patent ID: 8651581
Filing Date: 2014-02-18
Classification: E21C,E21F

Abstract:
1. A safety device for movable excavation devices in an underground longwall mine, wherein a device control unit is assigned to each excavation device, by means of which the moving functions of each respective excavation device can be controlled via data input devices, and a central controller is assigned to multiple excavation devices for the purpose of detecting moving functions of the excavation devices, and controlling the same in a chronological process, said safety device comprising: a detection device on each of the support shields for the purpose of detecting the presence of a person in a defined detection zone, wherein the detection device has a radio transmitter and a radio signal receiver, and communicates with transponders which are worn by persons present in the longwall mine, and switching devices arranged on each of the device control units for the purpose of halting the functions of the associated excavation device and/or for the purpose of interrupting the data input to the same, wherein said functions and/or data input result in moving functions of the excavation device, if a person is present in the working zone of the excavation device when the excavation device is working, wherein multiple detection areas are collected into a danger zone, wherein the personnel data of all persons located in the danger zone are centrally stored as an updated personnel status for the danger zone, wherein the detection devices are operated continuously or in regular cycles to constantly detect the personnel data of the persons located in the detection zone thereof and report to the central controller for the danger zones, wherein the saved updated personnel status in the danger zone and all the detected personnel data for one of the associated detection zones are constantly compared for concordance, and wherein if a discrepancy arises between the saved data status and the detected personnel data, the central control unit can execute a data command which halts all functions of the excavation devices and interrupts all moving functions, said data commands being directed at the switching devices of all excavation devices.