LENGTH-VARIABLE JOINT OF SUCTION PIPE TO DUST CHANNEL Russian patent published in 2009 - IPC E21F17/02 E21D9/11 

FIELD: mining.

SUBSTANCE: invention is related to mining industry, namely to devices for tunneling of underground bottomholes. Device comprises tunneling combine, stationary transportation accessory, transmission or bridge transporter arranged between them and installed with the possibility of movement on walker mechanism or frame, accordingly, and ventilation accessory. Ventilation accessory comprises suction pipe, immovable ventilation pipeline and length-variable joint of suction pipe with dust channel of ventilation accessory. Length-variable joint comprises helical ventilation pipe suspended on bearing cord. Bearing cord is stretched between two support parts of walker mechanism or frame, accordingly, displaced in the same direction and tunneling combine, and is directed by means of diverging rollers.

EFFECT: invention provides for reliable installation of ventilation pipe, excluding hogging under action of longitudinal loads.

10 cl, 6 dwg