Direct pump control type electro-hydraulic heaving compensation device

Abstract

The invention discloses a direct pump control type electro-hydraulic heaving compensation device. A servo motor drives a bi-directional hydraulic pump to rotate; two output ends of the bi-directional hydraulic pump are respectively connected with a rod cavity and a rodless cavity of a single-rod hydraulic cylinder; two overflow valves which are reversely mounted are also connected between the two output ends in parallel; an energy accumulator is connected with a quick connector on the rod cavity side of the single-rod hydraulic cylinder and is also connected with a first pressure sensor; two output ends of the bi-directional hydraulic pump are respectively connected with a second pressure sensor and a third pressure sensor; a rotating speed sensor is connected to the servo motor; all sensors and a servo motor driver are respectively connected with a control computer; a movable pulley is connected to a piston rod of the single-rod hydraulic cylinder; a fixed pulley is connected to the bottom of the single-rod hydraulic cylinder; and a built-in displacement sensor is mounted inside the single-rod hydraulic cylinder. The direct pump control type electro-hydraulic heaving compensation device has the advantages that an autonomous device is formed by a direct pump control differential cylinder closed type circuit; the servo motor, a hydraulic element and the sensors are integrated; closed loop control is carried out by the control computer; and throttling loss is avoided.

Description

technical field [0001] The invention relates to a crane heave compensation control system, in particular to a direct pump-controlled electro-hydraulic heave compensation device. technical background [0002] Since the 21st century, the world's demand for energy has increased day by day, and the ocean has become the focus of the energy strategies of various countries in the new century. Countries all over the world have increased their efforts in ocean development. With the massive development of offshore oil, large-scale offshore projects are also booming, and offshore cranes are one of the key equipment in these projects. [0003] The heave and swing of the hull caused by the wave movement greatly limits the operating capacity of the offshore crane. It will cause equipment damage and personal injury or death. The biggest technical difference between offshore cranes and ground cranes is to eliminate the impact of wave motion on crane operations. [0004] The existing well...

AI Technical Summary

Problems solved by technology

[0010] The existing active linear compensation technology adopts a valve-controlled open circuit in its hydraulic system, which needs to be equipped with a hydraulic oil source and a hydraulic valve group to work. Not only is it bulky, the pipeline connection is complicated, and there are many components, but also due to throttling loss, The whole system is very inefficient

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