Title: Apparatus for automatic stabilizing details of grab bucket
Application Number: 85102187 Application Date: 1985.04.01
Publication Number: 1000154 Publication Date: 1985.12.20
Approval Pub. Date: Granted Pub. Date: 1991.01.02
International Classifi-cation: B66D5/30,G05D13/62
Applicant(s) Name: Shanghai Ship Transport Science Inst., Ministry of Address:
Inventor(s) Name: He Kai, Li Kehua
Attorney & Agent: XIN LIXU RAO HUANGSHANG
Abstract:
     The automatic grab zeroing device has solved the technical problem in enabling the output singal to increase and decrease or maintain a given level. By combining with an electromagnetic control device for adjustable-blade hydraulic torque converter, it makes up an automatic zeroing control system for the grab in the air to effect an automatic stop of the latter without mechanical braking, thereby achieving convenient operation,slight mechanical impact on the hoist and, consequently, an extended service of the hoist. The system is applicable for grab hoists, well-drilling derricks and cranes, which use an adjustable-blade hydraulic torgue converter as power conversion device.
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