Abstract: A polygonal shaped shield washer for mounting on a pick holder having a mating polygonal shaped barrel, the washer including a top having an interior opening and outer periphery defined by plurality of edges, each pair of adjacent edges being joined at a corner, and a skirt extending rearwardly from the outer periphery of the top, the skirt having a plurality of edges and corners aligned with the edges and corners of the top.

Abstract: A horizontal shaft impact crusher, including a crusher housing having an inlet for material to be crushed and an outlet for material that has been crushed. An impeller is mounted on a horizontal shaft in the crusher housing and is operative for rotating around a horizontal axis. Material to be crushed is accelerated by the impeller against a curtain. An adjustment device is provided for adjusting the position of the curtain relative to the impeller. The crusher housing includes at least two guide rails to which the adjustment device is slidably connected. A retaining device is arranged to hold, with a predetermined holding force, the adjustment device in a crusher operation position relative to the guide rails. The adjustment device is movable along the guide rails from the crusher operation position and away from the impeller in response to an excessive force being transferred from the curtain to the adjustment device and exceeding the predetermined holding force.

Abstract: A rotational tool includes a cutting head and a basic body. The cutting head includes a cutting portion including a chip flute and at least one of a cutting edge and an insert seat, where the chip flute is located before the at least one of the cutting edge and the insert seat in a rotational direction of the cutting head. A coupling portion is located axially rearward of the cutting portion relative to a cutting end of the cutting head, and is configured to couple to the basic body. A coolant slot extends axially and opens at an external radial surface of at least a portion of the cutting head.

Abstract: An assembly is disclosed including a holder block, a cutting pick, and an optional hollow sleeve, wherein the shank of the cutting pick is inserted into the holder block or, where present, into the hollow sleeve. When assembled, surfaces of the components meet at an interface. At least one of the first interface and the second interface includes one or more sets of wear elements including cemented carbide bodies press fit into recesses in the forwardly oriented surfaces meeting at the interfaces. The wear elements mitigate direct contact between the opposing surfaces of the components at the interfaces and prevents excessive wear from repetitive impact because the harder wear elements, e.g., cemented carbide, are contact points between the opposing surfaces of the components at the interfaces. A machine incorporating the assembly and a method of manufacturing the assembly are also disclosed, particularly a machine for mining, excavating, tunneling, road planing and/or construction.

Abstract: A gyratory crusher, including an outer crushing shell and an inner crushing shell forming between them a crushing chamber, the crushing chamber communicating with a discharge zone that forwards crushed material from the crushing chamber and out of the crusher. The inner crushing shell is supported on a crushing head. The outer crushing shell is supported on a crusher frame. At least one sealing arrangement is between the discharge zone and a working part zone in which at least one bearing for the crushing head to perform a gyratory movement relative to the crusher frame is arranged. The sealing arrangement includes a sealing surface, and a sealing member arranged to seal against the sealing surface and including an inner circumferential flexible sealing lip, an outer circumferential flexible sealing lip and at least one inlet for pressurized fluid to be supplied to an overpressure zone arranged between the inner and outer sealing lips and the sealing surface.

Abstract: Gyrator crusher has a crusher head on which a first crushing shell is mounted, a frame on which a second crushing shell is mounted, the first and second crushing shells forming a crushing aperture. Drive device rotates an eccentric causing the connected crusher head to perform gyratory movement for crushing. Dust seal seals a gap between the frame and a fastening portion situated close to the crusher head and includes a seal bellows and a seal slide ring. Seal slide ring connects sealingly to a lower portion of the seal bellows and has a lower slide surface adapted to slide along, and to sealingly abut, with a substantially vertical abutment pressure, against an upper slide surface on the frame. Upper portion of the seal bellows sealingly connects to the fastening portion so rotation of the crusher head rotates the seal slide ring about a substantially vertical axis of rotation.

Abstract: A replaceable distributor plate, adapted for protecting a lower horizontal disc of a rotor of a vertical shaft impact crusher, includes a first portion of a bayonet joint, the first portion being adapted for cooperating with a second portion of the bayonet joint, the second portion being associated with the lower horizontal disc.

Abstract: A screening media for use in vibrating screen devices that fractionize crushed stones or gravel. The screening media is made by extruding a fiber-reinforced rubber or polymeric material to form a strip in a length longer than that needed to make individual screening mats for use in the vibrating screen devices. Screening apertures are then punched in the strip, and the apertured strip is cut into individual mats. The extruded strip includes side portions configured to connect to support structures of the vibrating device. Prior to the cutting step, the apertured strip can be maintained in the form of a coil or a long-length element.

Abstract: A tool pick assembly and a tool and block assembly are disclosed. A sleeve is positioned about the shank to allow rotation of the tool pick and also friction fit with the block. The sleeve is stepped in complement to the shape of the surface of the shank of the tool pick and the shape of the surface of the bore in the tool holder and extends substantially all of the length, optionally all of the length, of the stepped bore in the block to reduce or prevent dust and fines from entering and wearing the bore surface. When assembled, the stepped sleeve and complementarily shaped shank of the tool pick each do not extend past the rear surface of the bore to mitigate or prevent shank deformation from impact during use.

Abstract: Milling insert and tool for center cutting milling of material. At least one first cutting edge is terminated in or adjacent to a center axis defined by the milling insert and includes a first cutting edge portion having a first radius that is essentially equally great for each point of the first cutting edge portion. The first cutting edge includes at least one second cutting edge portion that is plane or has at least one second radius for each point of the respective second cutting edge portion, the at least one second radius being greater than the first radius and that is situated between the first cutting edge portion and the center axis. One second cutting edge portion adjoins the first cutting edge portion, and one second cutting edge portion is terminated in or adjacent to the center axis.

Abstract: A roller for a roller hearth furnace comprising a dispersion strengthened steel is disclosed. The roller does not require any coating or reconditioning.

Abstract: An insert intended for electrical furnaces and of the type that includes an insulating shell having an outside and an inside having a rotationally symmetrical, e.g., cylindrical shape, and a heater element that is arranged inside the insulating shell and extends several turns in a continuous loop having an overall shape corresponding to the rotationally symmetrical shape of the insulating shell. The continuous loop includes spaced-apart bends, which divide the same into individual sections of limited length to which occurring thermal expansion is isolated locally. In an exemplary embodiment, the bends are U-shaped to impart to the continuous loop a meander shape. Another exemplary embodiment relates to a heater element.

Abstract: A vertical shaft impact crusher for crushing material including a rotor for accelerating a first flow of material to be crushed, a first feed device for feeding the first flow of material to the rotor, a housing that includes a circumferential impact wall section against which the accelerated first flow of material may be crushed, and a second feed device for feeding a second flow of material to be crushed into the path of the accelerated first flow of material. The second feed device includes an inner hopper and an outer hopper. The inner hopper includes at least one outlet for allowing the second flow of material to enter a space formed between the inner and outer hoppers. A slide plate inclined substantially tangential in relation to the rotor is located adjacent the at least one outlet in the space between the inner and outer hoppers.

Abstract: The present invention relates to a drilling tool incorporating first and second ends, a cuttable and/or processable shaft extending between the ends. The first end has a drill bit to penetrate rock. The drill bit and the shaft have complementary threads. The drill bit and the shaft comprise a relative rotation stop means that ensures that the drill bit remains loose during drilling in a first direction. The invention further relates to a self drilling rock bolt, a drill bit, drill shaft and shaft coupling, and an anchoring device per se.

Abstract: A face mill and a replaceable milling insert are disclosed. The front side of the milling insert is tilted at a clearance angle (?) in relation to the reference plane (RP). The cutting edge of the milling insert extends between two end points, which move in circular paths of different radii. The cutting edge forms a negative radial angle (?) with an imaginary radial line (A) that extends from the center axis (C1) of the basic body and intersects the first end point of the cutting edge. The front side and chip surface of the milling insert mutually form a nominal angle (?) that amounts to at most 83° . The cutting edge is straight and in the entire length thereof situated in the reference plane (RP), the negative radial angle (?) thereof amounting to at least 70°.

Abstract: A milling or boring tool has a main tool body rotatable about a tool axis and a cutting element which can be fastened to the main tool body and which has a cutting portion or a cutting insert seat for receiving a cutting insert. To provide a fastening system for fastening the cutting element to the main tool body, which is to be easily implemented at low cost, which allows highly accurate positioning of the cutting element on the main tool body, and which permits very rapid exchange of the cutting element, a centering pin is arranged parallel to the boring axis with an axis that does not coincide with the tool axis and is connected on one part, the main tool body or the cutting element, and a corresponding centering opening is provided on the other part, the cutting element or the main tool body.

Abstract: A shim plate for mounting in a cutting tool for rotary chip removing machining, the cutting tool including a basic body having a rotational axis, a peripheral envelope surface concentric with the rotational axis, a front end surface, and at least one insert seat including a seat surface, the basic body being rotatable in a direction of rotation and arranged to, in each insert seat against the seat surface, receive the shim plate and a mountable cutting insert adjacent to the shim plate. The shim plate includes a bottom surface adapted to adjoin to the seat surface of the basic body, a contact surface opposite to the bottom surface and adapted to adjoin to the cutting insert, and at least one side surface that extends between the bottom surface and the contact surface.

Abstract: A gyratory crusher comprises a first crushing shell mounted on a crushing head, and a second crushing shell mounted on a machine frame, a crushing gap being formed between said first and second crushing shells. A method of controlling the operation of said crusher comprises measuring a parameter being representative of the stresses to which the crusher is exposed during the crushing of material, determining an average value of said parameter, determining a deviation value of said parameter, calculating a peak value based on said average value and said deviation value, comparing said peak value to a reference value, and controlling the operation of the crusher in view of said comparison between said peak value and said reference value.

Abstract: There is described a crushing plant and a method for controlling the same. The crushing plant includes a crusher (1) and a feeding arrangement (3), and is driven by a diesel engine (13). A load value related to the diesel engine is retrieved e.g. by means of a J1939 interface. If the retrieved value exceeds a predetermined threshold value, the control loop of the feeding arrangement (3) is altered. Thereby it can be avoided that the diesel engine (13) stalls, such that continuous operation of the crushing plant may be ensured.