Abstract: This invention relates to a chain drum arrangement for a central or double central scraper chain conveyor, comprising a divided chain wheel, the shell-type chain wheel segments of which are attached, locked in rotation and detachably, via an axial splined portion to the shaft, wherein the chain wheel is secured in its installed position on the shaft by means of locking rings disposed on both sides and at least one of these two locking rings consists of a divided locking ring which can be taken off radially from the shaft in order to remove the divided chain wheel from the shaft. According to the invention, the divided locking ring is disposed as an intermediate ring between the divided chain wheel and a hollow journal which receives the respective shaft bearing and which projects axially from the respective side cheek of the machine frame into the interior space thereof, which results in a narrow mode of construction of the divided locking ring.

Abstract: A chain drum arrangement for a central or double central scraper chain conveyor which includes a divided chain wheel and shell-type chain wheel segments which are attached and locked in rotation to or detachably from the shaft. The chain wheel is secured in its installed position on the shaft by ring parts disposed on both sides of the chain wheel, and at least one of these ring parts has a divided locking ring which can be taken off radially from the shaft in order to take off the divided chain wheel from the shaft.

Abstract: A drive gear and guide arrangement for a mining machine such as a disk shearer which operates above a chain scraper conveyor. The guide arrangement includes a guide rail arranged on a trough section of the chain scraper conveyor and extends along side of the chain scraper conveyor forming a chain duct for a drive gear chain which moves the mining machine along the conveyor. The guide rail includes a profile lug which engages over the horizontal chain links of the drive gear chain and holds the chain links on a chain support in the chain duct. The guide rails also includes a rolled profile which forms a sealing strip that closes off the chain duct of the drive gear chain on the side of the conveyor. The chain duct includes opening on the storing side which are designed to discharge fine materials which enter the trough section.

Abstract: The pans of a scraper-chain conveyor are interconnected with a dog-bone type connector which fits into laterally open shaped pockets in the side walls of the pans. A projection on one of the ends of the connector engages in a recess closed off from the side access while a projection at the opposite end of the connector is locked in place with a swivelled-in locking plate. The plate fits into compartments in the side wall of the associated pan. The plate carries a resilient pin at one end which fits into recesses in one of the compartments while the opposite end of the plate has a tongue which snaps into a recess in the base of the opposite compartment.

Abstract: A transfer station between a scraper-chain face conveyor and a scraper-chain roadway conveyor in a mine working has a frame for guiding the scraper-chain assemblies of the conveyor so that material discharges from the face conveyor to the roadway conveyor. The frame has a pair of spaced-apart side walls with identical connecting blocks fitted to their exteriors. The connecting blocks have pockets for receiving couplers and depressions which form bearing half-shells for a support for a drum around which the scraper-chain assembly of the roadway conveyor passes. The connecting blocks on each side wall can connect with connecting blocks of the drum support or with connecting blocks on an endmost ramp pan of the roadway conveyor so that the pan and the drum support can be interchanged in position.

Abstract: A scraper unit for a scraper-chain assembly is composed of a scraper and a clamping strap which define beds for receiving one or more chain links. The clamping strap is fixed to the scraper with the aid of nuts and bolts and one or more pivot joints formed between the strap and the scraper ensure that when the nuts are tightened onto the bolts, the clamping strap pivots on the scraper to clamp the chain link or links into position.

Abstract: A conveyor channel section has shaped side walls composed of superimposed rolled profiled strips identical in construction and shape A floor plate extends between the side walls and projects between inclined curved wall portions of upper and lower profiled strips. Longitudinal welds join the floor plate to the ends of the wall portions The wall portions merge with flanges extending inwardly of the floor plate and with ribs extending in an opposite direction outwardly of the floor plate at the level of the flanges. Spill plate holders are welded to the exteriors of the side walls between the ribs and connectors at the ends of the side walls permit adjacent channel sections to be joined together with the aid of coupling members.

Abstract: A plough box containing a chain wheel driving a chain to propel a chain used to move a plough is mounted for displacement alongside a machine frame at one end of a scraper-chain conveyor. To adjust the tension in the chain a motor is operated to drive a self-locking worm gearing which employs a worm wheel meshing with a rack fixed to the machine frame and extending in the direction of the chain.

Abstract: A plough guide which is built onto the runs of channelling of a scraper chain conveyor, has angle plates which form a slide path for the plough and which are connected by their upwardly extending sides to the runs of channelling. Sliding spacers are provided behind a covering between an upper chain channel and a lower chain channel. Covering hoods which form the covering for the channels are each pivotably mounted to a lower guide beam. The hoods can be swung over on the pivot joints towards the face in order to open the upper chain channel. The spacers are connected to the angle plates via fitting plates which are rigidly connected thereto and which extend upwards beyond the spacers. The fitting plates are provided with centering pins which engage centering apertures in the angle plates. The fitting plates can be connected to the sliding spacers and/or the angle plates by welding.

Abstract: A channel section or pan for a scraper-chain conveyor has a floor plate welded between side walls. The floor plate has reduced thickness end regions which provide upper and lower tongues which establish joints with corresponding complementary tongues of the floor plates of adjacent pans. Each tongue has a prominent curvilinear profile in plan view with several smooth curved projections and depressions transverse of the floor plate.

Abstract: A cutter bit assembly for a mining or tunnelling machine has a cutter shank detachably fitted into a socket of a holder. To secure the shank in position a piston is displaced to cause pressure fluid to flow into a working chamber and act on a piston at one end of a rod-like securing element. The element is forced against a surface of the shank to urge the shank about a pivot and this in turn thrusts rear support surfaces of the cutter and the holder together. To release the cutter the pressure fluid is relieved and spring force displaces the securing element away from the shank. In this released condition, the cutter can be swivelled about the pivot and withdrawn from the socket.

Abstract: The pans of a scraper-chain conveyor have a plough guide at one side. The pans are connected together at said one side with the aid of coupling pieces engaged in pockets in the side walls of the pans. Each coupling piece is pivotably fitted to a plate-like securing element which serves as a handle to enable the coupling piece to be inserted into or removed from the pockets. The securing element can be swung down into further pockets formed in the plough guide to lock the coupling piece in place.

Abstract: A coal wining plough in a longwall working employs adjustable floor cutters mounted on curved carriers displaced in guideways on the body of the plough. Wedges abut on the upper ends of the carriers and are moved by hydraulic piston and cylinder units to set the position of the floor cutters and define the cutting level adopted by the plough. The units are operated with the aid of valves which respond to an electronic control device. Command signals from a remote control station are transmitted as by a radio to the plough to set up the electronic control device. Sensors on the plough provide electrical signals representing the position of the interface between the coal face and the floor and these signals are transmitted back to the control station. In a control sequence the plough runs along the seam and the sensor(s) provide signals relayed to the control station which also receives signals representing the distance moved by and/or the position of the plough.

Abstract: To firmly connect an upper trough-like component of a scraper-chain conveyor to a lower component use is made of arch-like locking pieces which fit on a side plate of the lower component which overlaps the side wall of the upper component. The upper regions of the locking pieces having inwardly projecting noses which fit into apertures in the side plate and side wall. Sockets are formed in projections on the side plate to receive the heads of screw-threaded securing elements which locate in recesses in the locking pieces and project through holes in side walls thereof. The securing elements adopt an inclined disposition and when nuts are tightened on their shanks the locking pieces tend to force and hold the upper component down on the lower component.

Abstract: A cutter-bit assembly employs an arcuate wedge to secure a cutter-bit within a pocket of a holder. The wedge fits into a tapered gap between complementary curved surfaces of the holder and the cutter-bit shank. A projecting insert carried by the shank mates with a serrated portion on the wedge. Contact is established between the wedge and the curved surfaces of the holder and the shank over outer regions separated by non-contacting clearances.

Abstract: A scraper-chain conveyor channel section comprises a return trough and a conveyor trough. The return trough is constituted by a pair of side walls interconnected by a floor plate. A respective support bar is fixed to each of the side walls of the return trough. The support bars have portions extending upwardly beyond the side walls of the return trough. The conveyor trough is arranged between the upwardly-extending portions of the support bars. The conveyor trough is constituted by a pair of side walls interconnected by a floor plate. Respective connection means are provided for connecting the conveyor trough to each of the support bars. Each of the connection means includes a plurality of bolts and a plurality of clamping members. Each of the bolts is seated in a respective pocket in the associated support bar, and is engageable with a respective clamping member to force that clamping member into engagement with a respective clamping face on the conveyor trough.

Abstract: A mineral mining installation employs a scraper-chain conveyor constructed from individual pans joined end-to-end and a plough having a drive plate running beneath the conveyor and on a skid bed formed as a sub-frame structure on the floor of the working. The drive plate is connected via guide means to the haulage run of a chain in a lower guide passage at the side of the conveyor opposite to the plough. An upper guide passage accommodates the return run of the chain. The passages are defined by a guide structure fitted to the side walls of the pans and includes detachable covers which can be removed for access purposes. At least some of the covers are linked with the sub-frame structure with the aid of tongue-and-groove connections.

Abstract: A cutter-bit assembly employs an arcuate wedge 16 to secure a cutter-bit 2 within a pocket 4 of a holder 1. An additional deformable insert or resilient backing piece 18 is also located in an arcuate gap between the cutter-bit shank and a curved surface of the holder. The insert or backing piece co-operates with teeth 19 to lock the wedge in position.

Abstract: A mineral mining machine guide is composed of individual sections joined end-to-end alongside the pans of a scraper-chain conveyor. Each guide section has a side wall component and a web plate component with spacers therebetween dividing upper and lower chain guide passages. An inclined foot plate component projects beneath the web plate component which is itself spaced above the foot plate component to form a slot through which the machine engages with the chain run in the lower passage. A pivotable cover closes the upper passage. Toggle-like coupling pieces fit into pockets in the ends of the web plate components of adjacent sections. Compartments in the web plate components above the pockets and at the level of the upper passage receive extensions of the covers which are hinged in these compartments. The coupling pieces are held in place with detachable locking plates which additionally co-operate with the covers to limit their outward pivotal movement.

Abstract: A coal plough has an elongate plough body which is provided with cutters at each end. The plough body is supported at each of its two ends, by a flat narrow skid on a plate of a plough guide. The skids constitute wear-resistant members and are connected to the plough body in a readily replaceable manner. The skids are so shaped that they guide the plough in the lower zone of the plough guide, and establish connection between the plough and the plough drive chain.