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 control unit for controlling machine functions of a mining machine, such as an underground mining machine, tunneling machine or bolting rig, includes a flameproof housing having at least one fluid inlet and at least one fluid outlet, and a plurality of fluid control valves respectively communicating with the at least one inlet and outlet. In particular, the fluid control valves are formed inside at least one valve monoblock, the monoblock including a plurality of distinct fluid passages.

Abstract: The present disclosure relates to a rock drill bit for a percussive drilling hammer positioned at the cutting end of a hammer. The drill bit includes a head, an elongated shank connected to the head at a front end of the bit, a head-shank transition area where the head connects to the shank, an anvil at the rear end of the shank for receiving the impact of the piston, a plurality of buttons provided at the front face of the head configured to engage the material to be crushed in the intended direction of drilling, and a plurality of flushing passages extending through the head and having at least one opening at the front face of the head. An angle formed between the head and the shank at the head-shank transition area is greater than 100 degrees.

Abstract: A drill bit includes a shank and drill bit head, which are both centered on a longitudinal axis, a gauge, and a front face with a peripheral edge adjacent to the gauge. An area within the peripheral edge defines a total area of the front face. The front face includes a central island at its radially innermost section, a plurality of peripheral platforms at its radially outermost section adjacent to the peripheral edge, and a recessed section positioned radially between the central island and the peripheral platforms. The central island and the peripheral platforms are axially raised compared to the recessed section. A plurality of inner front inserts are positioned on the central island and at least one outer front insert is positioned on each of the peripheral platforms. The area of the recessed section is >62% of the area of the total area of the front face.

Abstract: A turning insert includes a top surface, an opposite bottom surface, and a reference plane therebetween. A center axis intersects the top and bottom surfaces and a side surface connects the top and bottom surfaces. A circular cutting edge is adjacent the top surface and the side surface. The top surface includes a set of first protrusions, which are elongated in a direction parallel to the adjacent cutting edge. A greatest distance from the reference plane to the first protrusions is greater than a distance from the reference plane to the cutting edge. The bottom surface has a set of radial grooves and includes a set of flat surfaces. The flat surfaces extend in a plane parallel to the reference plane, wherein in a top view each first protrusion is symmetrical in relation to a line extending between the center axis and a mid-point of the first protrusion.

Abstract: A drill string including an elongate hollow main length section and a male spigot portion provided at the second end and having an externally threaded section and a non-threaded shank positioned axially intermediate the main length section and the threaded section. The shank includes a transition section positioned adjacent the main length section or a radially projecting shoulder at the second end. The transition section has an outside diameter that increases in a direction from the male spigot portion to the main length section or the shoulder. The cross-sectional shape profile of the outer surface of the transition section in the plane of the longitudinal axis has a segment of an ellipse having semi-major axis (a) and a semi-minor axis (b), wherein the ratio of the semi-major to semi-minor axes (a:b) is within the range 2b<a<8b.

Abstract: A tool for opening and/or closing rotatable joints, includes a slewing ring, a first grip member, and a second grip member. The first grip member is an annular plate. The second grip member includes two identical gripper arrangements, which include a gripper, an actuator, and bearing members of the actuator. The slewing ring includes an annular upper plate and an annular guide plate, between which plates grippers of the second grip member are arranged. The guide plate is arranged to slide in slots of slide pieces, which are in connection with the first grip member. The bearing members of the actuators are in connection with the first grip member, which actuators are arranged to move the grippers of the second grip member. The grippers are fastened to the slewing ring in a pivoted manner and arranged to grip the shaft of the joint.

Abstract: A coated cutting tool includes a substrate coated with a multi-layered wear resistant coating having a layer of ?-Al2O3 and a layer of titanium carbonitride TixCyN1-y, with 0.85?x?1.3 and 0.4?y?0.85, deposited on the ?-Al2O3 layer. The TixCyN1-y exhibits a texture coefficient TC(hkl), measured by X-ray diffraction using CuK? radiation and ?-2? scan. The TC(hkl) is defined according to Harris formula: TC ? ( hkl ) = I ? ( hkl ) I 0 ? ( hkl ) ? [ 1 n ? ? n = 1 n ? I ? ( hkl ) I 0 ? ( hkl ) ] - 1 , wherein I(hkl) is the measured intensity (integrated area) of the (hkl) reflection; I0(hkl) is standard intensity of the standard powder diffraction data according to JCPDS card no. 42-1489; n is the number of reflections used in the calculation, and where the (hkl) reflections used are (1 1 1), (2 0 0), (2 2 0), (3 1 1), (3 3 1), (4 2 0) and (4 2 2), and wherein TC(1 1 1)?3.

Abstract: A roller cutter for a drill head for raise boring. The roller cutter having a shaft with a longitudinal center line, a hub rotatably mounted on the shaft, and a seal retainer located between the axial ends of the hub and the shaft at least arranged at one end of the roller cutter. The seal retainer supports a primary cutter seal providing sealing between the shaft and the hub in both axial and radial directions. A secondary cutter seal is located between the seal retainer and the hub, such that the secondary cutter seal provides sealing in the axial direction.

Abstract: A clamping device is arranged for releasably holding a tool holder shank and includes a housing, a wedge engagement member reciprocally mounted inside the housing, and a wedge having a first pressure receiving surface and first and second wedge surfaces. An aperture extends radially through a wall of the housing and the wedge engagement member extends radially outwards into the aperture. The first wedge surface acts upon a wedge engagement slide surface on the wedge engagement member and the second wedge surface acts upon an aperture slide surface. The wedge is arranged between a surface of the housing and a surface of a member securely arranged to a drawbar to effectuate a displacement of the drawbar when the wedge is moved inwards, to clamp the tool holder shank. A sleeve is arranged around the peripheral surface of the housing for moving the wedge inwards when the sleeve is moved.

Abstract: A drilling rig includes a carrier, a ground support attached to the carrier for supporting the carrier on the ground, a drilling boom attached at a first end to the carrier, a feed beam attached to a second end of the drilling boom, a drilling unit attached movably along the feed beam, a ground pin attached to the feed beam for supporting the feed beam onto the ground, and control means configured for performing the steps of at least: receiving ground support force information indicative of force applied by the ground support to the ground, and detecting ground contact state of the ground pin on the basis of the received ground support force information.

Abstract: A sensor assembly for a rock bolt, wherein the rock bolt includes a central rod, a split tube and a wedge anchor assembly fitted around the central rod, a rock plate, and a nut for attachment to an outer end of the central rod. The sensor assembly includes a distance sensor, a bracket for attaching the distance sensor to an outer portion of the split tube, an elongate spacing member configured to be fitted around the split tube between the nut and the rock plate to keep the nut and the rock plate spaced apart. The spacing member has an opening extending along at least a portion of the length thereof, the opening being sized large enough to allow movement of the bracket along a portion of the length of the spacing member with the distance sensor attached to the outer portion of the split tube by the bracket.

Abstract: A down-the-hole drilling assembly activated by fluid under pressure includes a casing having an axially rearward and forward end, a piston arranged movably inside the casing, a plurality of fluid passages for feeding and discharging pressurized fluid into and out of a working chamber for generating reciprocating movement of the piston, a drill bit at the forward end and provided with an anvil facing towards the piston for receiving impacts therefrom and an annular drive sub surrounding at least a portion of a shank and cooperating with the bit to form fluid passages extending length-wise along the shank. The drive sub has a concave arcuate groove extending circumferentially to form a chamber for collecting fluid from the hammer exhaust and redistributing a volume of the collected fluid from channels formed between complimentary splines of the drive sub and splines of the bit to flushing holes arranged in the bit.

Abstract: A rock drilling arrangement includes an impact device having a frame, pressure chambers in the frame, and a piston arranged in the impact device. The arrangement further includes a rear mounting arrangement for attaching the impact device to a carriage, a front mounting arrangement for attaching the impact device to a machine component, at least one fore pressure accumulator arranged on a front side of the rear mounting arrangement in an axial direction of the piston, and at least one rear pressure accumulator arranged on a back side of the rear mounting arrangement. The fore pressure accumulator and the rear pressure accumulator are connected to one of the pressure chambers and arranged to absorb pressure fluctuations in the pressure chambers.

Abstract: A gyratory crusher main shaft sleeve for friction fitting over an uppermost tapered end of a crusher main shaft includes an elongate axial wall extending from an upper end to a lower end and having external and internal facing surfaces aligned transverse so as to taper inwardly towards a central axis. The tapering is defined by a sleeve tapering angle formed between the internal facing surface and an imaginary axis parallel to the central axis. The internal surface of the sleeve has a section in the axial direction with an upper end and a lower end. The sleeve section, from the upper end to the lower end, has a section tapering angle formed between the internal surface and the imaginary axis. The section tapering angle is different from the sleeve angle defining the tapering of the sleeve from the sleeve upper end to the section upper end.

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 drill bit for percussion drilling includes a drill bit body including a front surface. The front surface includes a first circular area arranged transverse and coaxially to the axis of the drill body, a second area surface surrounding the first area surface, and a third area surface surrounding the second area surface. A number of buttons are arranged in the second and third area surfaces. The button body of each button has a forward end surface. The buttons are arranged in circular recesses extending substantially transverse from the second surface and third area surface into the drill bit body. The recesses have a radius corresponding to the button body radius and a depth corresponding to the length of the button body, such that the button bodies are fitted within the drill bit body with the forward end surface exposed in the second and third area surfaces.

Abstract: A screening assembly for a mobile bulk material processing apparatus is capable of adjustment of its position with respect to the base frame of the mobile bulk material processing apparatus in order to facilitate the transfer of material from the screen on to the processing unit, such as a crusher, by optimizing the height and the angle of operation of the screening assembly. The screening assembly is also capable of being folded into a compact arrangement, which is compliant to transport regulations, while also being convenient and safe for the operators. The screening assembly includes a base frame and at least two linking elements coupled at pivotable joints in such a way that when in operational position, the two linking elements are configured to adjust the height and the angle of inclination of the screen box to facilitate transfer of material from the screen to the crusher.

Abstract: A corrosion resistant duplex stainless steel (ferritic austenitic alloy) is suitable for use in a plant for the production of urea. Uses of the corrosion resistant duplex stainless steel include in objects made of said duplex stainless steel, in methods for the production of urea, in a plant for the production of urea comprising one or more parts made from said duplex stainless steel, and in methods of modifying an existing plant for the production of urea. In one aspect, the composition consists of in weight % (wt %): C 0.010 to 0.015; S 0.08 to 0.23; Mn 1.0 to 1.05; Cr 29.07 to 29.92; Ni 5.76 to 7.17; Mo 3.0 to 4.0; W max 2.55; N 0.3 to 0.35; Cu max 0.01; S max 0.008; P max 0.008; at least one of Ti, Nb, Hf, Ca, Ba, V, and B max 0.5 total; balance Fe and unavoidable occurring impurities.