Crown block lifting safety device

The utility model discloses a safety device for lifting a crown block. The utility model has the structure that the existing single-loop position switch in a working circuit of the crown block is replaced by a double-loop position switch (1); one loop position switch (1B) is still connected with the...

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Bibliographic Details
Main Authors ZAILIN DU, HUAIHUA WANG, YAWEI GU
Format Patent
LanguageEnglish
Published 28.03.2001
Edition7
Subjects
CRANES
HAULING
HOISTING
LIFTING
LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS,WINCHES, OR TACKLES
PERFORMING OPERATIONS
TRANSPORTING
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Summary:The utility model discloses a safety device for lifting a crown block. The utility model has the structure that the existing single-loop position switch in a working circuit of the crown block is replaced by a double-loop position switch (1); one loop position switch (1B) is still connected with the working circuit, and the other loop position switch (1A) is connected to an audible and visual alarm which is independent of the working circuit and is composed of an alarm lamp (2) and an electric bell (3). When the hook head of the crown block rises at a higher position, the position switch (1A) acts firstly to audibly and visually alarm to remind the driver to stop rising; when the driver operates to continuously rise, the position switch (1B) acts, and the working circuit is switched off. The utility model can reduce the probability of an accident that the crown block pushes the hook.
Bibliography:Application Number: CN2000214550U