| 摘要 |
The present invention is a lifting system that can be used to construct cylindrical grain bins. It includes sets of identical, telescoping jacks actuated by hydraulic cylinders and an hydraulic system having separate hydraulic circuits that serve each set of jacks. The separate hydraulic circuits include identical pumps and control valves. The pumps and the control valves can be operated in unison to supply equal amounts of hydraulic fluid to the sets of jacks so that all of the jacks may be raised or lowered in unison. The lifting system can be used to uniformly lift successive rings of a grain bin structure made up of connected panels. After a first ring is lifted, a second ring can be attached to the lower edge of the first ring. The second ring is then lifted and the process is repeated until the grain bin is completed.
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