Hydraulic crane

US10836613B2 · kind B2 · utility

Assignee

• CARGOTEC PATENTER AB · SE

Inventors

• Per Gustafsson · Kalmar, SE
• Sten Sirén · Pargas, FI

Key dates

• Filing date: May 17, 2017
• Grant date: Nov 17, 2020
• Expiry date: Oct 21, 2037

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66C23/78
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A hydraulic crane comprising: —a rotatable column (7); —a crane boom system comprising a first crane boom (11) connected to the column; and —an electronic control device for controlling the movement of the column and the crane boom system on the basis of control signals from a manoeuvring unit and a calculation model for boom tip control. The control device is configured to switch from a first control mode into a second control mode when the first crane boom is about to interfere with an obstacle. In the first control mode, the control device controls the crane boom movements in accordance with an ordinary control strategy. In the second control mode, the control device makes the load suspension point (P) of the crane boom system move along the trajectory defined by said control signals while controlling the crane boom movements in accordance with an auxiliary control strategy in which the first crane boom is prevented from interfering with the obstacle.