Relay on small portal crane

The utility model discloses a relay on a small portal crane. The technical scheme is that the relay on the small portal crane comprises a programmable logic controller (PLC), a normally-opened contact on a limit switch is in series connection with a coil on an intermediate relay, and a normally-clos...

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Bibliographic Details
Main Authors CHEN BUBAO, RONG HONGYAN, LIU LONG, ZHANG HONGQUAN, GENG YIN
Format Patent
LanguageChinese
English
Published 11.07.2012
Subjects
BASIC ELECTRIC ELEMENTS
CRANES
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
HAULING
HOISTING
LIFTING
LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS,WINCHES, OR TACKLES
PERFORMING OPERATIONS
RELAYS
SELECTORS
TRANSPORTING
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Summary:The utility model discloses a relay on a small portal crane. The technical scheme is that the relay on the small portal crane comprises a programmable logic controller (PLC), a normally-opened contact on a limit switch is in series connection with a coil on an intermediate relay, and a normally-closed contact on the intermediate relay is connected to the PLC through a lead. The relay on the small portal crane has the advantages that the repetitive work of a user replacing the intermediate relay is omitted, maintenance cost is also saved, and accordingly the service life of the relay is prolonged.
Bibliography:Application Number: CN20112411190U