FIELD: transport.
SUBSTANCE: conveyor roll 5 comprises drum case 54, union 55 to feed fluid and fastener 52 to secure roll in conveyor frame. Drum case has external tune 541 arranged to rotate about first fastener. External tune peripheral surface 543 has multiple holes 545 to discharge fluid communicated with aforesaid union. Internal tube 542 is arranged in internal tube to make structural part of drum case is arranged in internal tube to make structural part of drum case. Flow chamber 544 is arranged between said internal and external tubes. Inner tube inner space id sealed relative to fluid passages.
EFFECT: higher reliability, easier cleaning.
9 cl, 4 dwg
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