초록 ▼

A conveyor apparatus for elevating loose bulk material from one level to another, as in self-unloading ships, and more particularly a dual belt conveyor-elevator having a relatively long horizontal feed section, and further including a belt take-up apparatus and system including a normal pressure mo

A conveyor apparatus for elevating loose bulk material from one level to another, as in self-unloading ships, and more particularly a dual belt conveyor-elevator having a relatively long horizontal feed section, and further including a belt take-up apparatus and system including a normal pressure mode for tensioning the outer belt of the dual belt conveyor-elevator under normal operating conditions, the belt take-up apparatus and system also including a high pressure mode which is connected in tensioning relation to the outer belt of the dual belt conveyor-elevator upon loss of motive driving power to the dual belt conveyor-elevator. The high pressure mode is capable of substantially immediately taking up slack which develops in the outer belt, particularly in the horizontal feed portion thereof, with consequent prevention of spillage of load material, when the driving power for the dual belt conveyor-elevator is interrupted.

대표청구항 ▼

A dual belt conveyor-elevator for conveying loose bulk material from one level to a higher level, comprising first and second endless belt conveyors extending between respective pairs of pulleys disposed contiguous the respective levels and providing for each conveyor a forward run and a return run,

A dual belt conveyor-elevator for conveying loose bulk material from one level to a higher level, comprising first and second endless belt conveyors extending between respective pairs of pulleys disposed contiguous the respective levels and providing for each conveyor a forward run and a return run, the forward run of the first belt conveyor including an upwardly facing substantially horizontal entry portion, the forward run of the second belt conveyor including a downwardly facing entry portion defining with a portion of said entry portion of said first belt conveyor a bight between the conveyors to receive loose bulk material therebetween and to be elevated thereby, the respective forward runs of said first and said second belt conveyors being normally maintained in fact-to-face edge sealing engagement substantially from the region where the loose bulk material is received between said belt conveyors at said bight to a discharge of said belt conveyors at said higher level, and means for applying two different tensioning modes to said first belt conveyor including a first tensioning mode in which a normal tension is applied to said first belt conveyor during normal operation of said dual belt conveyor-elevator, and a second tensioning mode in which a substantially higher tension than said normal tension is applied to said first belt conveyor effective substantially immediately upon loss of motive power to said conveyor-elevator, whereby to substantially prevent accumulation of slack in said first conveyor belt upon said loss of motive power and thereby minimizing spillage of material from between said belt conveyors upon said loss of motive power.