Abstract: A device for monitoring the service life of a machine-technical installation includes a sensor module and at least a measuring sensor for detecting stresses and expansions from a structural component of the machine-technical installation, a microcontroller, an antenna arrangement and a current source; the sensor module being in bi-directional connection with a data processing unit and having an antenna arrangement integrated therein, the antenna arrangement including a low-frequency antenna by means of which the sensor module is turned on and off and a high-frequency antenna for sending and receiving high frequency signals and wherein the sensor module can transition from an operating mode into a stand-by mode for energy efficiency and is reactivated through a signal from a detector element.

Abstract: In a method of making a chain, in particular a round steel chain of tempered steel, a chain strand is produced in a conventional manner and subject to the usual heat treatment of normalizing, hardening and annealing. Annealing is implemented at a low temperature level of below 200° C. A tempered steel is used having a microstructure which, after hardening and annealing, has a stable residual austenite content between 3% and 10%. After the final calibration process, the chain strand is subjected to a thermal aftertreatment at a temperature between 190° C. and 250° C. This relieves stress resulting from the calibration process and the associated work-hardening. In this way, the notch impact energy capacity is enhanced.

Abstract: A block connecting link for round steel chains includes two identical stirrup-like link halves each having an essentially rectangular cross-section and a rear surface without projections, planar side surfaces, convexly curved end surfaces and receiving means for round chain links located adjacent the transverse middle plane and facing the middle plane of division between the link halves. At one end of each link half is provided a projection which protrudes beyond the middle plane of division, wherein the projection includes a convex bracket protruding at a distance toward the adjacent end surface, and at the other end of the link half a projection which also protrudes beyond the middle plane of division and has a concave recess adapted to the bracket and arranged at a distance from the adjacent end surface.

Abstract: In the scraper for chain bands of double-center chain scraper conveyors, the chain shackle is shaped in such a way in the direction of the scraper longitudinal axis that, during mounting with an inserted double-center chain, the chain shackle first comes to bear on those two legs of the horizontal chain links located towards the center of the scraper, in order, when the screw connection is tightened further, additionally to clamp the outer legs of the chain links. When a defined mounting force has been reached, the inner and outer chain-link legs are clamped with the same force. The concave curvature of the shackle, in contrast to the straight shackle, prevents the shackle from lifting off from the inner chain-link legs due to the bearing effect of the outer chain-link legs. An always uniformly distributed and permanently firm and reliable chain clamping is thereby guaranteed.

Abstract: In a medium-chain conveyor with two-part scrapers, in particular in the form of a double medium-chain conveyor, with a specific link thickness standardized, for example according to DIN, the horizontal links have a shorter pitch than the standard pitch. The side links of the chain wheel have a length corresponding to the length of the shortened horizontal links, which is shorter than the standard pitch; and that, in the area underneath the chain wheel side links, the teeth of the chain wheel are asymmetrical in the direction of rotation of the chain wheel or in the direction of travel of the chain, as a result of removing material on the toothed flank in the direction of travel and adding material to the opposing toothed flank. A substantially higher service life of the chain wheels and of those parts of the entire chain belt system in such conveyors interacting therewith is achieved by this.