Abstract: A face equipment for mechanical extraction in longwall mining, in particular in the underground hard coal mining industry, includes a face conveyor (17) arranged along the mining wall, an extraction device (18) that can be moved along the face conveyor (17), and shield support frames (10) supported on the face conveyor (17) at an angle thereto. In order to determine the height of the face opening, a flexible hose level (21) with a liquid-filled hose (22) placed between the face conveyor (17) and at least one main component of the shield support frame (10) is installed in the area of the face conveyor (17). A pressure sensor (23, 24, 28) is arranged on at least one end of the hose (22). An inclination measuring device (25, 26) is arranged on the face conveyor (17) and on the main component of the shield support frame (10).

Abstract: A face equipment for mechanical extraction in longwall mining, in particular in the underground hard coal mining industry, includes a face conveyor (21) arranged along the coal face, an extraction mechanism (22) that can be moved along the face conveyor (21), and shield support frames (10) fastened at an angle to the face conveyor (21). In order determine the shield height of the extended shield support frame (10) corresponding to the face opening height, a flexible hose level (17) with a liquid-filled hose (18) is installed between the roof canopy (13) and floor skid (11) of individual shield support frames (10), and a pressure sensor (19) is arranged on the skid-side end of the hose (18). An inclination measuring device (25) is arranged on the roof canopy (13), and the pressure sensor (19) and inclination measuring device (25) are connected to an analyzing and control unit.

Abstract: A face equipment for mechanical extraction in longwall mining, in particular in the underground hard coal mining industry, includes a face conveyor (21) arranged along the coal face, an extraction mechanism (22) that can be moved along the face conveyor (21), and shield support frames (10) fastened at an angle to the face conveyor (21). In order determine the shield height of the extended shield support frame (10) corresponding to the face opening height, a flexible hose level (17) with a liquid-filled hose (18) is installed between the roof canopy (13) and floor skid (11) of individual shield support frames (10), and a pressure sensor (19) is arranged on the skid-side end of the hose (18). An inclination measuring device (25) is arranged on the roof canopy (13), and the pressure sensor (19) and inclination measuring device (25) are connected to an analyzing and control unit.

Abstract: A face equipment for mechanical extraction in longwall mining, in particular in the underground hard coal mining industry, includes a face conveyor (17) arranged along the mining wall, an extraction device (18) that can be moved along the face conveyor (17), and shield support frames (10) supported on the face conveyor (17) at an angle thereto. In order to determine the height of the face opening, a flexible hose level (21) with a liquid-filled hose (22) placed between the face conveyor (17) and at least one main component of the shield support frame (10) is installed in the area of the face conveyor (17). A pressure sensor (23, 24, 28) is arranged on at least one end of the hose (22). An inclination measuring device (25, 26) is arranged on the face conveyor (17) and on the main component of the shield support frame (10).

Abstract: Method of automatically producing a defined face opening, in underground coal mining, during longwall mining operations having a face conveyor, a disk shearer loader and a hydraulic shield support. Via at least one inclination sensor on the top canopy of the shield support frame, the inclination of the top canopy relative to the horizontal, in the direction of mining or extraction of the disk shearer loader, is determined to provide angles of the course of an overlying stratum at the shield support frame. A stepping path length of each shield support frame is detected, and therefrom a cutting depth of the disk shearer loader during an extraction run is determined. A cutting height of the disk shearer loader is detected by means of sensors disposed thereon, and a cutting height of the disk shearer loader is adjusted in alignment with the angle of the course of the overlying stratum to produce the defined face opening.

Abstract: A method for controlling a longwall mining operation, including a face conveyor, at least one extraction machine, and a hydraulic shield support, in underground coal mining. Using inclination sensors disposed on at least three of the four main components of each shield support frame, such as floor skid, gob shield, support connection rods, and gob-side region of the top canopy, the inclination of the shield components relative to horizontal is ascertained in the direction of step. In a computer, the ascertained inclination data is compared with base data stored in the computer that defines the geometrical orientation of the components and their movement during stepping. From the comparison, a respective height of the shield support frame, at the forward end of the top canopy, is calculated as a measure for the face opening.

Abstract: A method for automatically producing a defined face opening in a longwall mining operation in underground coal mining, using a face conveyor, at least one plow, as an extraction machine, guided on the face conveyor, and respective hydraulic shield support frames having, as main components, a floor skid arrangement, a gob shield, a top canopy and support connection rods. Inclination sensors are disposed on at least three of the floor skid arrangements, the gob shield, the support connection rods and a gob-side region of the top canopy. From the sensors, an inclination relative to a horizontal is ascertained. From the inclination data, by comparison with base data defining a geometrical orientation of the components and movement thereof during a stepping process, a respective shield height of the shield support frames perpendicular to a bed thereof is calculated and is compared with a machine-dependent fixed cutting height of the plow to establish if deviations exist.

Abstract: The invention relates to a method and a device for cleaning the door of a coke oven, said door comprising a sealing edge and a membrane that is attached to the door panel of the coke oven. According to said method, cleaning tools comprising jet nozzles, which are supplied with a flow medium at high pressure, are situated and displaced back and forth in the region between the sealing edge and the door panel of the coke oven, in such a way that the interior surface of the membrane and the sealing edge are cleaned. The coke oven door is cleaned directly after the coke oven chamber is opened, by at least one jet nozzle element, which is supplied with compressed air and is displaced along the sealing edges. The jet nozzles are oriented in such a way that the air hits the surface to be cleaned at an acute angle.

Abstract: Longwall equipment for mechanical extraction, especially in underground coal mining, including a face conveyor disposed along a longwall face, a disc shearer loader that includes a machine body that rests, and is guided, upon the face conveyor and includes two shearing discs pivotably disposed thereon, with the machine body extending over the face conveyor and forming a portal that prescribes a maximum loading cross-section of the face conveyor, a lifting mechanism mounted on the machine body for guiding it on the face conveyor in a vertically adjustable manner and for variably adjusting the portal cross-section, a drive element height-adjustably disposed on the machine body and engaging an abutment fixedly disposed on the face conveyor, and shield support units that include top canopies that project toward the disc shearer loader.

Abstract: A method for controlling a longwall mining operation, including a face conveyor, at least one extraction machine, and a hydraulic shield support, in underground coal mining. Using inclination sensors disposed on at least three of the four main components of each shield support frame, such as floor skid, gob shield, support connection rods, and gob-side region of the top canopy, the inclination of the shield components relative to horizontal is ascertained in the direction of step. In a computer, the ascertained inclination data is compared with base data stored in the computer that defines the geometrical orientation of the components and their movement during stepping. From the comparison, a respective height of the shield support frame, at the forward end of the top canopy, is calculated as a measure for the face opening.

Abstract: A method for controlling the extraction capacity of longwall operations in underground coal mining, including ascertaining the respective demand of the longwall operations, for air-technology and climate-technology resources, as influencing variables for a projected delivery quantity on the basis of data applicable to equipment of the longwall operations and to mineral deposit parameters, and storing the ascertained influencing variables in a computer as target data. Actual data for a raw coal delivery quantity, for air flowing through, for the supplied cooling capacity, and for the exhaust gas during running operation is detected and conveyed to the computer. if an increased demand for resources is recognized, coverage is initiated via a changeover of excess resources available at other longwall operations or if a reduced demand for resources is recognized, excess resources are rerouted to other longwall operations experiencing corresponding demand deficiencies.

Abstract: A method for controlling longwall mining operations, having a face conveyor, at least one extraction machine, and a hydraulic shield support, in underground coal mining. At least one sensor is disposed on the shield support frames for acquiring solid-borne noise data generated by the engagement of the extraction machine in coal and/or country rock. A cut of the extraction machine into the country rock is determined in a downstream computer on the basis of recorded vibration data that corresponds to the generated solid-borne noise.

Abstract: A method for automatically producing a defined face opening in a longwall mining operation, in underground coal mining, having a face conveyor, at least one extraction machine and hydraulic shield support frames. Inclination sensors are disposed on at least three of the four main components of each shield support frame, such as floor skid, gob shield, support connection rods and gob-side area of the top canopy. From ascertained inclination data, by comparison with base data defining a geometrical orientation of the components and a movement thereof during stepping, a respective shield height of the shield support frames perpendicular to a bed thereof is calculated. From further sensors on the extraction machine, a cutting height thereof is acquired as a face opening.

Abstract: A method for maintaining, in a controlled manner, a top canopy/coal-face distance expedient for rock mechanics, in longwall mining operations in underground coal mining, using a face conveyor, at least one extraction machine, and a hydraulic shield support frame. Inclination sensors are disposed on at least three of the four main components of the shield support frame, including floor skid, gob shield, support connection rods and gob-side area of the top canopy. An inclination of the top canopy and floor skid are ascertained via the sensors. From the ascertained inclination data, in a computer, the effects on a top canopy/coal face distance are determined when changes in an angle of inclination of the top canopy occur. An automatic adjustment of decisive cycle parameters of the shield support frame are carried out, wherein the work cycle comprises retraction, advancement and setting processes.

Abstract: A roadway support (1) is introduced in parallel to the face advancement of a gallery(1) by means of a selective cut heading machine (2) by providing lagging mats (18, 19) in the form of rolled mats (20, 21) downstream of the cutting tool (3) of the selective cut heading machine (2) in two transverse planes (14, 15) that are arranged behind one another in the longitudinal heading direction in circumferential offset relationship. The lagging mats (18, 19) are then unrolled simultaneously to the face advancement in the longitudinal heading direction so as to overlap laterally and are instantly aligned upon the rock. Once the lagging mats (18, 19) have been entirely unrolled, the working steps are successively repeated in accordance with the length of the face advancement with new lagging mats (18, 19) that adjoin the lagging mats (18, 19) previously laid. The roadway support (7) is introduced at a distance to the cutting tool (3) while fixing the lagging mats (18, 19).

Abstract: A drag chain conveyor for use in underground mining, including interconnected, profiled conveyor chutes in which are guided conveyor chains of metallic material. Plastic carriers are attached to the conveyor chains, with attachment being effected via a molding around of annular chain links of the conveyor chains with plastic, wherein the plastic, which is molded for a simultaneous production of the plastic carriers monolithically with connecting regions that hold the chain links, penetrates and surrounds the chain links. At least one drive is provided for the conveyor chains.

Abstract: A method for the in-situ extraction of gas from coal seams is provided. Flow paths are produced in gas-containing coal by opening up the structure of the coal by introducing into a bore hole that is sunk into the coal at least one gas and/or liquid under pressure over a prolonged period of time at a pressure that is less than the lowest principal stress determined in a respective seam layer from which gas is to be extracted. The introduction into the bore hole is carried out with a cyclically fluctuating pressure. Gas is subsequently extracted via the bore hole.

Abstract: The invention relates to a container for fluids having a volume (2a) which can be filled with a fluid, and emptied by pressurizing the fluid by subjecting it to internal gas pressure. The invention is characterized in that the container has a valve device (7a) for filling the volume (2a) with the fluid, while the internal gas pressure is generated by compressing a gas trapped in the container (1a). It is thus not necessary to fill the receptacle with pressure gas separately.