Abstract: The invention relates to the longwall face support of an underground mine having supports (plates 1-18), which longwall face support comprises camera housings (35) each having two cameras (36), which record a monitoring area of the face having a plurality of plates in the longitudinal direction of the gallery and the most complete registration possible of the cross section of the gallery. The cameras in a monitoring area are assigned to a common power supply unit (48) for the power supply and are equipped with intrinsically safe electronics. The electronics have a radio device for high-frequency data transfer (transmission and reception) together with antenna 39 (W-LAN antenna) for the wire-free connection to the local camera network (Wireless Local Area Network). Each camera and each camera housing is assigned a camera code and an address code, which is added to the identification data.

Abstract: A hydraulic circuit for longwall support for use in underground mining for supporting a longwall by means of a plurality of support shields incorporates a pressure monitoring device in the pressure line between the load maintaining valve and the shield control valve. The pressure monitoring device can be a device for monitoring the piston position of the shield control valve which device signals a deviation of the set position predetermined by the shield control device from the measured actual position of the piston of the shield control valve in the form of a deviation signal. It may also be a pressure sensor which signals the deviation of the set pressure predetermined by the shield control device from the measured actual pressure in the form of a deviation signal. Signaling can be acoustic or optical.

Abstract: A hydraulic circuit for longwall support for use in underground mining for supporting a longwall by means of a plurality of support shields includes in the annular piston line of each cylinder/piston unit a pressure sensor. The pressure sensor, upon reaching a predetermined maximum pressure activates a pressure deviation signal, causes the entire longwall to be depressurized by means of a longwall shut-off valve. The pressure deviation signal is blocked for one of the hydraulic valves against each triggering signal.

Abstract: The invention relates to a control device for an extracting unit in the face of a mine, for actuating the hydraulic actuator in the sense of drawing, stepping, setting, and having a plurality of main valves for connecting the actuator of the extracting unit to a main pressure line and a main return line, and a similar plurality of pilot valves, each associated with a main valve for adjusting same and connected to the main pressure line via a pilot pressure line common to all pilot valves and connected to the main return line via a return line common to the main valves and the pilot valves. The pilot pressure line can be shut off and the return line can be blocked off from the main return line and connected to a measuring device for measuring escaping hydraulic fluid.

Abstract: A safety device which detects personnel data of persons located in the detection zone thereof, said safety device operating continuously or in regular cycles and reporting to the central controller. The personnel data of all persons located in the longwall mine are stored in a central storage device of the central control and constantly compared to the detected personnel data. If a discrepancy arises between the saved personnel data and the detected personnel data, the central control unit executes a command which halts all functions of the excavation devices and interrupts all moving functions, said command being directed at the switching devices of the associated excavation devices.

Abstract: A known metering system for automatically maintaining a predefinable concentration of a liquid corrosion inhibitor in the aqueous hydraulic liquid of a water-hydraulic hydraulic system is characterized in that the measuring circuit can be disconnected from the hydraulic system (controllable valves 14, 15), in that the measuring circuit can be short-circuited between the outlet line and the inlet line by means of controllable valves 16, 17 and can be connected to a source (cleaning tank 18) of a cleaning liquid for a cleaning circuit. As a result, a cleaning liquid for cleaning the concentration sensor can be circulated in the measuring circuit for a predefinable time. For the purpose of calibration, the metering system can be charged with a reference liquid with a known inhibitor concentration, in particular water, in particular water from the public supply. Further sensors (23-25) can be connected into the measuring circuit.

Abstract: A hydraulic circuit for longwall support for use in underground mining for supporting a longwall by means of a plurality of support shields comprises a pressure monitoring device in the pressure line between the load maintaining valve and the shield control valve. Said pressure monitoring device can be a device for monitoring the piston position of the shield control valve which device signals a deviation of the set position predetermined by the shield control device from the measured actual position of the piston of the shield control valve in the form of a deviation signal. It may also be a pressure sensor which signals the deviation of the set pressure predetermined by the shield control device from the measured actual pressure in the form of a deviation signal. Signaling can be acoustic or optical.

Abstract: A safety device which detects personnel data of persons located in the detection zone thereof, said safety device operating continuously or in regular cycles and reporting to the central controller. The personnel data of all persons located in the longwall mine are stored in a central storage device of the central control and constantly compared to the detected personnel data. If a discrepancy arises between the saved personnel data and the detected personnel data, the central control unit executes a command which halts all functions of the excavation devices and interrupts all moving functions, said command being directed at the switching devices of the associated excavation devices.

Abstract: An electrically controlled actuating element is arranged on a machine by a flange connection consisting of a mounting flange (4) and a machine flange (2), and is controlled by an electric control subsystem (6). Embedded in the mounting flange (4) in a predetermined geometric pattern is a plurality of electric switches (7.1-7.8, 8.1-8.8). Each switch is arranged in an electric circuit that connects to the control subsystem. In the machine flange (2), closing elements are arranged in some marking points of the geometric pattern in a geometric arrangement that is characteristic of the respective machine and associated to it. In an existing flange connection, the switches located in the respective marking points can be actuated by the closing elements. The control subsystem (6) of each consumer is provided with a memory (11), which stores the geometric arrangement of the closing elements that is characteristic of and associated to the machine.

Abstract: The light sources for illuminating the stope support at a longwall face are operated at low voltage, connected to the control network device, for low voltage supply of the system controllers. LEDs are particularly suitable as light sources. Measures for avoiding an impairment of the function of the system controllers are disclosed.

Abstract: The invention relates to a mining device that is used at the face of a mine, said device comprising a sensor that is mounted on the planer for identifying the rock and transmitting rock data for no more than two measuring points per extraction unit via radio to each extraction control device. The measuring signals of adjacent measuring points are evaluated with respect to the prevalence of rock or coal. Based on said evaluation, the tilting unit that is common to the measuring points is controlled with regard to the raising or lowering of the planer. Each tilting unit is allocated an inclinometer, whose measured value of the inclination of the channel in the transversal direction of the latter is fed to the extraction control device and compared with the tilt signal that is generated by the evaluation. Each inclinometer is equipped with a radio transmitter for the radio transmission of the inclination signals to the assigned extraction control device.

Abstract: A longwall support in a mine that comprises a plurality of longwall support units. The longwall support units are supported relative to a conveyor by stays that comprise cylinder-piston units. A control system with data acquisition, data storage, and programming is used to adapt the distribution of the staying forces over the length of the longwall, the sum of the staying forces acting upon the length of the longwall (total staying force), and the distribution of the advance forces over the length of the longwall continuously to the desired position of the conveyor. As a result, it is possible to influence the total staying force by the number of the stays with respect to an adjustable maximum, or the total staying force by controlling the longitudinal forces of the individual stays, or the total staying force as a function of at least one of the end positions of the conveyor.

Abstract: A hydraulic switching mechanism for longwall supports. The present invention provides a hydraulic system that is controlled by its own pressure and may be adaptable to those currently in use so that life-threatening and costly faults cannot occur. With the present invention, the retrofitting of existing systems may be made possible without significant expenditure in modification.

Abstract: A hydraulic control for a longwall support with a plurality of face support frameworks (1-3), which are adapted to be actuated in the sense of longwall support functions, in particular in the sense of the longwall support operations: robbing, advancing, and setting, comprises hydraulic control valves (8, 9) for each of the biasing elements, which are each arranged in close spatial relationship with the biasing elements, and subdivided into groups. Each group connects to a hydraulic pressure line (16), which extends over the longwall length of a plurality of face support frameworks, via a group connection line (18), which can be blocked by a group stop valve (20) as a function of the actuation of the control valves, specifically, when all control valves are not actuated and all biasing elements of the group are in a static state.

Abstract: A longwall support control for controlling the movements of longwall support units in the longwall of a mine that includes a central control system and a plurality of control units, of which a separate control unit (mining shield control device) is locally and operationally associated to each longwall support unit. The mining shield control devices connect to the central control system and to one another via two bus lines, through which each of the mining shield control devices can be called up for inputting a control command from the central control system or an adjacent mining shield control device. The identical second bus line (parallel bus) permits retransmitting to the adjacent mining shield control device, incoming signals that do not store a code word assigned to the respectively addressed mining shield control device.

Abstract: A longwall support control for controlling the movements of the longwall support units and the advance heading in the longwall of a mine comprises a plurality of control units, of which a separate mining shield control device is locally and operationally associated to each longwall support unit. Each mining shield control device comprises a multi-channel radio transceiver, such that the mining shield control device is in a simultaneous transmit and receive mode with a decentralized operating device for receiving control signals and for transmitting inspection data. The mining shield control devices may be interconnected and each mining shield control device may include an amplifier.

Abstract: A longwall support control for controlling the movements of longwall support units in the longwall of a mine that includes a central control system and a plurality of control units, of which a separate control unit (mining shield control device) is locally and operationally associated to each longwall support unit. Each mining shield control device comprises a switching element, which permits separating the bus line or lines in the mining shield control device. The mining control devices may also include signal amplifiers. An identical second bus line (parallel bus) permits retransmitting to the adjacent mining shield control device, incoming signals that do not store a code word assigned to the respectively addressed mining shield control device.

Abstract: The invention relates to a releasable non-return valve, in which a connection between a working chamber and a connector chamber may be closed by a non-return piston and opened by the opening movement of a release piston which may be pressurized with a release pressure. The non-return piston, discharge piston and release piston are arranged concentric to each other with the release shaft in the common valve axis. The valve has a cartridge embodiment with a non-return valve cartridge which may be inserted in the valve housing and a discharge valve cartridge independent of the non-return valve cartridge. The release shaft extends through the non-return piston with a sliding seal and engages behind the piston base by means of a stepped diameter for opening. The discharge piston is pressure compensated on both sides by pressurization with the working pressure.