A method for removing a hydraulic support for solid filling coal mining includes digging a support removing channel (3) in a coal body (2) in front of the hydraulic support (1), and laying a support removing track (4), then removing the hydraulic support from a coal conveying gateway (11) to a track gateway (5), temporary supporting is carried out by matching a single supporting column with a n-type steel beam before each hydraulic support is removed. A supporting roof is reinforced in time by means of erecting a crib (13) and grouting after each hydraulic support is removed, three grouting pipelines (12) are laid after the supports of the whole work surface are removed, and grouting is carried out in the whole finishing cut space. The roof of the support removing space of the work surface is stable so that the hydraulic supports on the work surface of solid filling coal mining are ensured to be safely and efficiently removed.

The present disclosure provides an apparatus for forming an underground tunnel. The apparatus comprises a cutting head for removing material from a wall portion of the tunnel and thereby forming a portion of the tunnel. Further, the apparatus comprises a support structure for supporting a previously formed portion of the tunnel. The support structure is arranged to provide a supporting force against a surface of the tunnel when stationary and when being moved along the tunnel. Further, the apparatus comprises a conveyor for conveying removed material from the cutting head to a location remote from the cutting head during formation of the portion of the tunnel.

Methods and equipment have been developed that combine the use of continuous miners, flexible conveyor trains, and longwall mining techniques to provide flexible and efficient removal of resources from subterranean formations. Some systems include: a main gate; and a tailgate connected to the maingate by an active mine face; wherein the active mine face extends at an angle between 95 and 135 relative to the maingate.

A pin retaining assembly for an advancing ram includes a retention plate and a retainer. The retention plate includes two oppositely facing surfaces and a channel with a notch between the two surfaces. The retainer includes a main body, a pin receiving slot, and at least two flanges. The main body is configured to slide into the notch of the channel and extend through a surface of the retention plate. The pin receiving slot has an open mouth through an end of the main body. A first flange extends from one end of the main body along a surface of retention plate and a second flange extends from another end of the main body along another surface of retention plate. The flanges retain the main body of the retainer in the first notch from moving in a direction defined by a longitudinal axis of the pin receiving slot.

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. Each radio device is configured such that data marked with an extrinsic camera code and data and signals marked with an extrinsic address code is emitted to be transmitted following reception.

The present disclosure relates to a hydraulic support with a quick response function for coal wall spalling, which includes a base, an upright post, a top beam, an extensible canopy, a face guard, and a vibration meter. The vibration meter is mounted on a hydraulic support, and detects a vibration signal of a coal wall in a non-contact mode. The face guard includes a primary face guard, a secondary face guard, and a tertiary face guard connected in sequence. One side, close to a coal wall, of the primary face guard is connected to a quick response device. The quick response device is in signal communication with the vibration meter. After receiving the vibration signal of the coal wall, the quick response device is abutted against the coal wall before the secondary face guard and the tertiary face guard fit the coal wall.

The embodiments of the present disclosure provide an asymmetric hydraulic support for pseudo inclined mining in steeply dipping seam, wherein the asymmetric hydraulic support includes a top mechanism, a bottom mechanism, a telescopic mechanism, and a connecting mechanism; the top mechanism and the bottom mechanism are disposed in parallel to each other, and a projection of the top mechanism and the bottom mechanism on a working surface is a parallelogram, and a sum of an acute angle of each of two parallelograms and a steeply dipping angle in pseudo inclined mining is 90; the telescopic mechanism is provided between the top mechanism and the bottom mechanism, and two ends of the telescopic mechanism are rotationally connected to the top mechanism and the bottom mechanism, respectively; one end of the two sets of connecting structures of the connecting mechanism is hinged by a first articulating shaft, and a central axis of the first articulating shaft is located in a middle of the top mechanism and the bottom mechanism, and the other end of each of the two sets of connecting structures is hinged to a first side of the top mechanism and a first side of the bottom mechanism, respectively, by a second articulating shaft; one end of the telescoping structure is hinged to a set of connecting structure which is hinged to the top mechanism, the other end of the telescoping structure is hinged to the bottom mechanism, and a center point of the hinging is coplanar with a vertical bisector of a projection of an edge of the first side of the bottom mechanism on the working surface.

A bolter miner includes a rack, a cutting device and a bolt support device. The cutting device is configured for a cutting operation and is arranged on the rack to swing up and down. The bolt support device includes a lifting assembly, a work platform, a first drilling frame assembly and a stabilization assembly. The lifting assembly is arranged between the rack and the work platform and is configured to lift the work platform. The first drilling frame assembly and the stabilization assembly are arranged on the work platform. The first drilling frame assembly has a bolt support position and an avoidance position. The work platform can extend and retract to switch the bolt support position and the avoidance position of the first drilling frame assembly. The stabilization assembly can be supported between the cutting device and a tunnel roof, so as to enhance the stability of the first drilling frame assembly during a bolt support operation.

A bolter miner includes a rack, a cutting device and a bolt support device. The cutting device is configured for a cutting operation and is arranged on the rack to swing up and down. The bolt support device includes a lifting assembly, a work platform, a first drilling frame assembly and a stabilization assembly. The lifting assembly is arranged between the rack and the work platform and is configured to lift the work platform. The first drilling frame assembly and the stabilization assembly are arranged on the work platform. The first drilling frame assembly has a bolt support position and an avoidance position. The work platform can extend and retract to switch the bolt support position and the avoidance position of the first drilling frame assembly. The stabilization assembly can be supported between the cutting device and a tunnel roof, so as to enhance the stability of the first drilling frame assembly during a bolt support operation.