Coal plough chain monitoring arrangement - has HF system with transmitter and detector on each side of links and positioned adjacent openings through chain guard

摘要

A coal cutting machine has a coal plough chain (4) which travels through a funnel shaped guide on the face conveyor made of sheet material, and positioned near the drive unit. Alongside a cut-out each side of the sheeting, is attached a housing (5) for a high frequency transmitter (7) one side, and a housing (50) for a detector (70). This forms part of a chain position monitoring system. The chain links pass through the path between the two respective oscillator circuits (6, 60. The detector (70) is connected to an external electronic pulse counter circuit (8).