Loading change control device and control method for marine hydraulic slewing crane

Abstract

The invention relates to the field of hydraulic cranes, in particular to a load-changing control device and control method for a marine hydraulic slewing crane with accurate maximum lifting load when controlling different amplitudes of the boom, convenient maintenance and good safety. A load-changing control device for a marine hydraulic slewing crane, including a multi-way valve connected to a power source, a two-way hydraulic motor, a luffing cylinder, a winch with a brake cylinder and transmission connection with the two-way hydraulic motor, a shuttle valve, and a first balance valve , the second balance valve, the ascending limit valve and the descending limit valve; the marine hydraulic slewing crane load change control device also includes the first relief valve, the second relief valve, the third relief valve, and two angle limit valves And limit stops for variable load control with two angle limit valves. The marine hydraulic slewing crane load-changing control device controls the maximum lifting load when the boom is varied in different amplitudes accurately, is convenient for maintenance, and has good safety. The control method of the marine hydraulic slewing crane load changing control device is automatic control, which is convenient and reliable.

Description

technical field [0001] The invention relates to the field of hydraulic cranes, in particular to a load-changing control device and control method for a marine hydraulic slewing crane with accurate maximum lifting load when controlling different amplitudes of the boom, convenient maintenance and good safety. Background technique [0002] The rated lifting load of the electric slewing crane remains unchanged at the maximum and minimum spans. The maximum lifting load of the common truck crane decreases with the increase of the span at different spans; the truck crane passes through the variable load control device. To control the maximum lifting load at different amplitudes, the truck crane load change control device includes a combination of an angle sensor and a torque sensor installed on the boom and a controller electrically connected to the angle sensor and the torque sensor, that is to say, the current common truck crane Basically, it adopts "pure electric proportional co...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the inaccuracy of the maximum lifting load and the difficulty in maintenance when controlling the different amplitudes of the boom because there is no load-changing control device suitable for marine hydraulic slewing cranes, and the load-changing control devices for automobile cranes are commonly used instead. In view of the disadvantage of poor power-on safety of the hydraulic slewing crane cylinder, a marine hydraulic slewing crane load-changing control device and control method for controlling the maximum lifting load at different amplitudes of the boom is provided, which is accurate, easy to maintain, and safe.

Images