Abstract: A drive and tensioning station (10) of a chain scraper conveyor for mining operations with a machine frame base (20) having side cheeks (21) and a conveyor base (22), connected to a line of pans of the chain scraper conveyor, with a tensioning frame head (50) which can be moved in the direction of the line of pans, in whose side cheek plates (51) can be mounted the chain drum (3) for the scraper chain, and with a tensioning drive having at least one tensioning cylinder (6) to move the tensioning frame head (50) relative to the machine frame base (20). The tensioning frame head (50) has a box-like drawer (60) extending out over the side cheek plates (51) toward the pan connecting side, which is guided in a type of drawer guide (26) on the machine frame base (20) and that on the tensioning frame head (50) a top run pan (70) forming a drag plate in the top run (4) and/or a bottom run box (40) forming a drag base in the bottom run are removably fastened.

Abstract: In a drive station for a chain scraper conveyor for mining operations the height position of the drive shaft, having a chain sprocket, can be set by means of an adaptor plate 50, which can be fastened at different height levels on a flange mounting zone on the machine frame of the drive station. The adaptor plates 50 have a machine frame side inner side 52 and a drive side outer side 53, onto which a drive set can be fastened. The adaptor plate 50 is fixed in position by means of fastening screws 56, 57 which engage through elongate holes 54, 55 into the machine frame. The position of the fastening screws 56, 57 in the elongate holes 54, 55, the direction of an asymmetric setting key 30 and the rotational position of an annular disc plate 40 with an outer ring 42 arranged eccentrically to an inner ring 41 determine the assembly position in each case.

Abstract: A drive shaft (5) with at least one chain wheel (7) for the drive of chain scraper conveyors, especially for underground mining operations, with a full-width drive shaft (5) mounted on both ends in bearings (4) on the machine frame (1), which has outer gearing teeth (6) for the positive rotational engagement with single part chain wheels (7), which can be pulled off the drive shaft (5), whereby the drive shaft (5) has outer teeth (6) along its longitudinal region, in which a through central gearing (6) reaches to the reduced diameters (17) of the drive shaft (5) in the proximity of the bearing housings (3).

Abstract: A chain drum arrangement for a scraper-chain conveyor has a chain drum, which is connected at its end regions to two mutually aligned chain drum shafts mounted rotatably in a machine frame and, when uncoupled, can be removed from its fitted position transversely to its longitudinal axis from the machine frame. The chain drum shafts have terminal shaft journals projecting inwardly from side wall sections of the machine frame whereas the chain drum is provided, at its end regions, with substantially radially extending pockets with which it can be plugged onto the shaft journals and locked non-rotatably thereto The shaft journals are peripherally flattened to engage positively in the pockets and have external regions which act as locking claws fitting into undercut regions of the pockets when the drum is partly rotated around the journals. Closure members with screwed-on releasable locking plates serve to lock the drum on the journals.

Abstract: A guide arrangement for a drum-type cutting machine is composed of a guide block cooperating with a guide rail and articulated at the lower end of a vertical guide arm of the cutting machine. The guide block has a pocket defined by lateral walls which receives the guide arm. A transverse bolt extends through the pocket in the guide block and is received snugly by a bore in the guide arm. One of the end regions of the bolt forms a pivot journal head with curved surfaces which is received in a pivot journal socket in one of the lateral walls of the pocket in the guide block. The other end of the transverse bolt fits with lateral play in a horizontal guide of the other lateral wall of the guide block. The inner surfaces of the lateral walls incline relative to a horizontal plane to permit the guide arm to cant about a vertical axis.

Abstract: In the driving and guide arrangement according to the invention, the drive chain in a chain channel bounded by a guide rail and a rear wall is supported only on series of spaced, narrow support elements at least some of which may form connecting plates welded between the rear wall and the guide rail. As the narrow support elements are spaced apart from one another, fines getting into the chain channel from above readily drop between them, and emerge freely through face side and gob-side discharge openings in the chain channel. Caking of fines in the chain channel is largely prevented in the arrangements, which are fabricated as welded constructions and are therefore particularly economical to produce.

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: The guide shoe according to the invention for cutting machines with a pintype drive has an insertion pocket in which a coupling piece engages from above, which coupling piece is arranged on a guide arm of the cutting machine and to which the guide shoe is attached so as to be pivotable by means of a transverse bolt which passes through the insertion pocket. In order also to allow the guide shoe to be pivotable about a vertical axis, the coupling piece is provided with an upright vertical journal which engages from below in a corresponding bearing hole on the guide arm. In this case, in a preferred embodiment, the bearing journal is decoupled from transverse forces which are transmitted between the guide arm and the guide shoe via a transverse-force piece arranged on the coupling piece.

Abstract: In the drive system according to the invention for a cutting machine which can be moved along a chain conveyor and has a pin drive chain arranged in a chain receptacle of the chain conveyor, the pin drive chain is attached at each of its two ends to a hydraulic tensioning cylinder device, with the aid of which the chain slackness which forms in the pin drive chain can be compensated. At the same time, holding devices, such as end stops, are provided in the region of the tensioning cylinder devices, which holding devices support or fix the chain section of the pin drive chain which is respectively under tensile loading.

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 conveyor pan connection of a scraper chain conveyor which conveyor pans having side profiles having profiled strips which form guide channels for scrapers and having outwardly directed flange strips. The conveyor pan connection includes coupling plates which are welded in between the outwardly directed flange strips at the ends of the side profiles of the conveyor pans, a first coupling plate projecting from an end of a first conveyor pan over a joint between conveyor pans and a second coupling plate at the opposing end of a second conveyor pan is set back with respect to the joint.

Abstract: A drive and transfer station for an underground mining installation employs a frame with spaced apart walls over which material is transferred between scraper-chain conveyors one arranged along a long wall mineral face working and the other arranged along an access roadway. The scraper-chain assembly of the face conveyor is driven by drive assemblies on opposite sides of the frame which drive a rotatable chain drum.At least one of the drive assemblies has a coupling in a gear box with a shaft which can be displaced axially with an adjusting device to drivably connect with the drum or to be released from the drum.

Abstract: A process for the preparation of water-dilutable polyvinylbutyral dispersions by (1) reacting an aliphatic acid having from one to three isocyanate-reactive groups and from one to three acid groups, or a mixture of such acids, with one or more polyfunctional isocyanates whose average functionality is at least two, where the quantity of the isocyanate component is chosen such that the ratio of the number of isocyanate groups to the number of isocyanate-reactive groups of the acid component is between 2.2:1 and 1.7:1; (2) then reacting from 25 to 75% of the remaining isocyanate groups with at least one monofunctional compound selected from monoalcohols and monoamines; and (3) reacting this NCO-functional emulsifier resin further with polyvinylbutyral and, if desired, with an appropriate plasticizer resin using a suitable auxiliary solvent. The polyvinylbutyral dispersions prepared in this way can be used as binders and binder components for coatings with good adhesion.

Abstract: The guide shoe arrangement for disk shearers having a pin wheel gear drive and a coupling sleeve into which engages from above a coupling piece disposed on a positioning arm of the disk shearer, to which a guide shoe is pivotably connected by a gudgeon traversing the coupling sleeve. The height of the guide shoe is considerably less than its length. At the one sidewall of the guide shoe, a guide lug that is preferably formed as a hooked cleat is fixedly disposed. With the guide shoe arrangement it is possible to place the center of gravity of the guide show very low, such as about the guide plane of the guide shoe.

Abstract: A mineral winning installation employs a shearer which is moved along a scraper-chain conveyor compound of individual pans mounted end-to-end. the shearer extends over the conveyor and is guided by guides provided at both sides of the conveyor. The body of the shearer has a driven chain wheel which meshes with an open-link chain serving as a rack abutment and laid on a bed alongside the side walls of the conveyor pans adjacent the mineral face. The side walls of the pans have upper and lower flanges which have strip-like projections directly outwardly from the pans. The chain is retained by the strip-like projections of the upper flanges of the pan side walls which overlap one side of the horizontal links and detachably hold-down strips which overlap the other side of the horizontal links. the hold-down strips are mounted for swivelling to release the chain links are detachably mounted to the support bars fixed to the support members.

Abstract: Toggle securing device for toggle joints of conveyor pans for chain conveyors, guide pans of winning machinery guides and the like with a securing plate which secures the toggle in its receiving pocket, laterally overlaps it at the end, can be introduced from the side into a respective insertion pocket by its two ends and can be caught in one of the two superimposed insertion pockets by a plastic pin which passes through a receiving hole in one end region of the securing plate and penetrates a locking orifice in the associated insertion pocket. In order to provide a securing plate for toggle joints, which can be used for toggle joints of known designs, either using a fixing sleeve or using a plastic pin as a securing element, the securing plate has a drive-in hole for a fixing sleeve at its other end region and is designed in such a way that it can be caught on the locking orifice of the insertion pocket either by means of the plastic pin or by means of the fixing sleeve after being rotated through 180.

Abstract: The invention employs pressure and displacement sensors for the automatic monitoring and adjustment of the pre-tension of endless belts, in the form of chains or the like, which sensors determine the pressure in the cylinder space and the movement of the piston of the tensioning cylinder, and the measuring signals from which sensors are evaluated by an electronic evaluation and actuation unit. In this respect the evaluation and actuation unit calculates from the measuring signals the changes in pressure which occur over a predetermined partial stroke of the piston of the tensioning cylinder, wherein these changes in pressure reflect the state of tension of the chain belt. When the chain tension is incorrect, the evaluation and actuation unit can therefore control the tensioning cylinder so that the optimum chain tension is set automatically.

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: An aqueous coating composition containing at least one water-dispersible polyurethane resin containing air-drying groups and optionally further binder resins and conventional paint additives, which polyurethane resin contains structural units derived from(A) polyisocyanates,(B) polyols containing air-drying groups,(C) optionally polyols which are free of air-drying groups,(D) compounds having at least two groups which are reactive with isocyanate groups and at least one group capable of anion formation,(E) optionally monoalcohls containing air-drying groups,(F) and/or compounds which differ from (B), (C), (D) and (E) and contain at least one group which is reactive with NCO groups, which has excellent pigment compatibility and the coatings produced therefrom have good corrosion protection and good mechanical properties even in the absence of siccatives.

Abstract: According to the invention, automatic adjustment of the cutting horizon of a cutter installation or other mining installation is effected with the aid of recognition sensors which detect the footwall rock interface and which are disposed distributed over the length of the cutter or machine guide, wherein the measuring signals from the recognition sensors are acquired by an electronic evaluation and control unit and are utilized in the sense of automatically controlling the adjusting cylinders.