Abstract: The present disclosure relates to a system and a method of controlling the movement of a tracked mobile mining machine having one or more articulated vehicle units. The control system works by taking input from manual or automated input means, the input serving as a set operating value for at least one driving parameter. The controller generates control signals, which are sent to regulating means that actuate the motor of the mobile mining machine. Using sensors on the machine, actual values of the driving parameter are measured in real-time and fed to the controller for comparison with the original set values. Any difference in the values is compensated for when the controller sends control signals to the regulating means causing readjustment of the driving parameter of the mining machine. The control system is applicable to crawler-driven powered vehicle units to ensure synchronous crawler movement for both linear and non-linear paths.

Abstract: A drill string for rotary drilling of underground mining machines includes a first elongate drill string member and a second elongate drill string member. The first member has a main section and a male end, and the second member has a main section and a female end. The male and female ends each have respective threads to provide a thread coupling between the male and female ends, the thread coupling enabling the male end to be secured inside the female end such that the male and female ends overlap axially. A thread lead of the respective threads of the male and the female ends are greater than a diameter of the male end and the female end.

Abstract: A cutting assembly for a mining machine includes a central hub having at least one arm extending radially outwards from the central hub. The arm includes at least one cutting means carrier movably arranged for radial movement along the arm and a primary actuator configured to control the radial position of the cutting means carrier. The cutting assembly further includes a locking means movable between an unlocked and a locked position, wherein the locking means in its locked position locks the cutting means carrier to the arm such that radial movement of the cutting means carrier is prevented. The locking means includes at least one locking member provided on the arm such that the locking member is movable between an extended position and a withdrawn position. The locking member in the extended position extends to engage the cutting means carrier such that movement of the cutting means carrier is prevented.

Abstract: A hydraulic system is arranged to control a plurality of drive motors suitable for driving conveying apparatus such as a conveyor belt. The hydraulic system includes a modular master and slave hydraulic units implemented as hydraulic circuits in which pressure sensors and pressure reducing valves provide speed, torque and directional control.

Abstract: A hydraulic system, mining machine and method of controlling a hydraulic actuator. The hydraulic system (HS) is provided with a control valve (23) for controlling movement direction and speed of a hydraulic actuator (HA) connected to the system. Generated force of the hydraulic actuator is controlled independently relative to the control valve by means of counterbalance valves (Cb1, Cb2) and servo valves (Sv1, Sv2) controlling their opening pressure. The counterbalance valves and the servo valves operate as a meter-out control assembly which controls flow of hydraulic fluid discharged from working pressure spaces (16a, 16b) of the hydraulic actuator. The disclosed system may be implemented to control a mining boom (3) of a mining machine (1).

Abstract: A heading machine includes first and second rotating cutting heads each having an axis of rotation extending substantially in a longitudinal direction of the machine, a first cutting roller having an axis of rotation extending substantially horizontal and transverse to the longitudinal direction of the machine, and a further cutting device supported on the cutting frame and arranged to cut off the cusps of unmined material left on side wall. The machine further includes a side stabilizer, and can cut a rectangular profile without leaving cusps left on the side wall.

Abstract: A flexible material handling apparatus is arranged to be installed on a full face heading machine. The apparatus includes a material handling member and a linkage member coupled together in a head-tail manner by a joint connection, and the linkage member at the other end may be coupled to a frame of a heading machine. The entire apparatus may be retracted to rest on the side of the machine frame and maintained there by a locking means. The material handling member may be swivelled about two separate vertical axes and brought outwardly to an oblique front position, where one or more locking means may be included to secure the material handling member fixed in place relative to the machine frame.

Abstract: An arrangement for fixing a pick to a cutting tool of a cutting machine includes a pick holder and a rotationally symmetrical pick sleeve, which is detachably fixed against an axial stop by surface pressure in a conical receiving element of the pick holder. The pick sleeve has an axial length that is greater than the axial length of the receiving element of the pick sleeve. A part of the pick sleeve that protrudes with respect to the edge of the receiving element when fixed has, on the outer diameter thereof, a conical bevel, which is inclined inwards.

Abstract: In a heading machine (1, 24) with at least one cutting unit with a rotatably mounted tool holder (10, 39) with disc tools (11, 12, 40, 41), which tool holder is connected in a pivotable manner to the machine frame, the heading machine (1, 24) has a running gear, in particular a crawler track (2), the tool holder (10, 39) is mounted rotatably on an arm (6, 26), which can be pivoted in the vertical direction and the rotational axis (9) of the tool holder (10, 39) runs transversely with respect to the longitudinal axis of the arm (6, 26).

Abstract: In a heading or extraction machine (1) including extraction tools that are movable over the working face, and track walling devices such as anchor drilling and setting devices (9), the machine (1) comprises a platform (6) that is displaceable in the longitudinal direction of the machine and carries at least two track walling devices each mounted to be separately displaceable relative to the platform (6).

Abstract: In a heading machine (1) including a track chain running gear, a cutter arm (3) pivotally fixed to a machine frame and comprising rotatably drivable cutting tools (4), a fresh-air supply for supplying fresh air to the working face, and an exhaust means for evacuating exhaust air and dust from the working face, the heading machine (1) further comprises at least one anchor drilling and setting device (5) disposed behind the cutting tools (4) and at least one working platform (11) disposed at least partially laterally outside the anchor drilling and setting device (5), wherein at least one air duct of the fresh-air supply and/or the exhaust means is led through below the at least one working platform (11) and/or laterally led around the working platform (11).

Abstract: In a track chain running gear (2) for mining machines (1), in particular heading machines, including at least one running gear case (5) and a track chain running around the running gear case (5) and formed by a multiplicity of chain links (3) articulately connected to one another, the running gear case (5), on its side facing the roadway, carries sliding plates (6) that form contact surfaces for the chain links (3) running along them, wherein the chain links (3), on their sides facing the sliding plates (6), carry wear plates (7) whose projecting surfaces cooperate with the contact surfaces of the sliding plates (6). In a chain link (3) for a track chain running gear (2), the chain link (3), on its side facing the sliding plates (6) of the running gear case (5), carries wear plates (7) whose projecting surfaces cooperate with the contact surfaces of the sliding plates (6).

Abstract: In a cutting device for a mining machine, in particular a shearer, including a tool carrier, in particular a shearer drum, that is rotatably mounted about a rotational axis and at least one cutting tool (1) that is fixed to the tool carrier, the cutting tool (1) comprises a tool base body (3) and a cutting insert (1) made of a diamond composite material or a harder material and fixed in a receiving bore (6) of the tool base body. The cutting tool is oriented on the tool carrier at an incident cutting angle (?) of 45-58°, preferably 47-54°, preferably 49°. The tip (2) of the cutting insert (1) is substantially conically designed, with the nose angle being 60-75°.

Abstract: In a cutting tool for a mining machine, in particular shearer, including a tool base body and a cutting insert (1) made of a diamond composite material and fixed in a receiving bore (6) of the tool base body, the diameters of the cutting insert (1) and the receiving bore (6) are dimensioned such that the cutting insert (1) is held in the receiving bore (6) by a shrink-press fit.

Abstract: In a heading machine (1) including a-machine frame (2) equipped with a travelling mechanism (3), a cutter boom (7) mounted so as to be pivotable in the height direction and carrying cutting tools (9), a preferably liftable and lowerable haulage device (11), and a supporting device for bracing the heading machine (1) within the road, wherein the supporting device includes a vertical support equipped with props that are braceable between the roof and the floor and to which support plates (14) are articulately joined on the roof and floor sides, as well as a longitudinal support connecting the roof-side end of the vertical support with the machine frame (2) and carrying a dust exhaust system, the dust exhaust system is held in a frame (23) that is mounted on the longitudinal support so as to be pivotable about a substantially horizontal axis (24).

Abstract: In a heading or extraction machine (1) including extraction tools that are movable over the working face, and track walling devices such as anchor drilling and setting devices (9), the machine (1) comprises a platform (6) that is displaceable in the longitudinal direction of the machine and carries at least two track walling devices each mounted to be separately displaceable relative to the platform (6).

Abstract: In a starter car for a drilling device for mining underground deposits, including a base frame (5) mounted to rotate about a vertical axis (6) and a starter pipe (7) mounted to pivot about a substantially horizontal axis (13) and provided for receiving the drilling device, the starter pipe (7) is arranged to be displaceable relative to the base frame (5) transversely to the horizontal pivot axis (13).

Abstract: In a supporting device (2) for an advance working or mining machine (1), including support props (3) and at least one roof bar (4), the roof bar(s) (4), on their sides facing away from the support props (3), include(s) a plurality of support cylinders (5) with support stops, which can be separately braced against the roof.

Abstract: In a heading machine (1, 24) with at least one cutting unit with a rotatably mounted tool holder (10, 39) with disc tools (11, 12, 40, 41), which tool holder is connected in a pivotable manner to the machine frame, the heading machine (1, 24) has a running gear, in particular a crawler track (2), the tool holder (10, 39) is mounted rotatably on an arm (6, 26), which can be pivoted in the vertical direction and the rotational axis (9) of the tool holder (10, 39) runs transversely with respect to the longitudinal axis of the arm (6, 26).

Abstract: In a heading machine (1) including a travelling mechanism (2) and a cutting boom (3) or frame, the cutting boom (3) or frame carries at least two rotating cutting heads (5) whose axes of rotation (6) extend in the heading direction or enclose acute angles with the heading direction and which, together, define a cutting profile having a profile width (a), as well as two cutting rollers (8,10) arranged substantially parallel and behind the cutting heads (5) and capable of being positioned on the floor (9) and on the roof (7), respectively. Both cutting rollers (8,10) comprise end portions (25) which are extendible to the width (a) of the profile for the formation of a substantially rectangular cutting profile.