An anti-drift mechanism for a downwardly oriented port rodder for cleaning a port opening of a recovery boiler. The anti-drift mechanism prevents a cutter of the rodder from accidently drifting from a retracted holding position into the port upon the loss of holding power to the actuator. Two embodiments are disclosed. The first is a frictional engagement with the port rodder while the second involves the use of a valve in conjuction with the actuator to trap fluid pressure and maintain the rodder in the holding position.
申请公布号
US5070823(A)
申请公布日期
1991.12.10
申请号
US19910645266
申请日期
1991.01.24
申请人
THE BABCOCK & WILCOX COMPANY
发明人
ACKERMAN, DEAN C.;BROWN, FRANCIS L.;HIPPLE, JAMES H.;SMITH, DON W.