Control device for automatically stopping swiveling of cranes
US5823369A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Mar 11, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/40043
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A device which comprises first calculating means for calculating a lower-limit time Tmin of swiveling control on the basis of dynamic characteristics of a swiveling angular velocity control system, second calculating means for determining a swinging period T of the suspended load, third calculating means for selecting a smallest natural number n for which nT.gtoreq.Tmin, and braking and stopping control means for braking and stopping the rotary body with an angular acceleration .alpha. indicated by the equation .alpha.=-.OMEGA.O/nT (where .OMEGA.O is the swiveling angular velocity of the rotary body immediately prior to the initiation of automatic swiveling stopping control), and which eliminates influences of elastic vibrations so as to insure an excellent stopping accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.