Dbt Gmbh

Markus Lenzing

Gerhard Merten

Jens Titschert

Sebastian M Mundry

Martin Broszat

Jeff Travis

Dan Ferguson

Johannes Weβelmann

A protection circuit for intrinsically safe electromagnetic actuators operating on the voltage from a power unit () approved for underground mining, for switching electrohydraulic valves () in underground mining, comprising at least two spaced-apart short-circuit means (orA) connected in parallel with the electromagnetic actuator coil () for short-circuiting the coil in the event of a reversal of the coil voltage. According to the invention, at least one of the short-circuit means comprises a short-circuit semi-conductor switch (orA) and a voltage-reversal detecting circuit () for activating the short-circuit semiconductor switch ().

Protection circuit for intrinsically safe electro-magnetic actuators and a protection circuit for intrinsically safe energy supply systems

A slide shoe for a mining winning machine is disclosed. The slide shoe includes a slide shoe body attached to the mining winning machine, a sliding area located on the slide shoe body and including a wear thickness, and at least one sensor. The sensor is scannable by wireless signal transmission. A dimension of the wear thickness decreases due to wear during operation, and a sensor signal of the sensor changes when the dimension of the wear thickness of the sliding area decreases below a predetermined minimum thickness.

Slide shoe for mining winning machine

Growing community of inventors

Selm, Germany

Markus Lenzing