HYDRAULICALLY OPERATED TELESCOPIC SHIP CRANE BOOM

摘要

The utility model relates to the field of hoisting and transport engineering and can be used in cranes with a hydraulically controlled multi-stage telescopic boom, the reliable and safe operation of which, given the working conditions on the open sea, is of particular importance. The hydraulically operated telescopic boom of a ship's crane includes a root section made in the form of a box-section beam, telescopic sections mounted in each other inside the root section and each equipped with a hydraulic cylinder for sequentially extending and retracting the extending sections, and a hydraulic circuit for working fluid, including into itself a tank for a working fluid, an extension pipeline and a retraction pipeline, and the hydraulic cylinders of the sliding sections, with the exception of the section farthest from the root section, are made with a hollow rod and are equipped with a telescopic pipeline built into these hydraulic cylinders, having two pipes inserted into each other, which are made with the possibility of telescopic movement relative to each other, while one of the two pipes is made stationary in the body of the hydraulic cylinder, the second pipe is made stationary in the rod of the hydraulic cylinder, and one of them has a recess in the end area in the lateral surface, due to h to him in a hydraulic cylinder with a fully extended rod, the working fluid can enter from the piston cavity of this hydraulic cylinder into the cavity of the telescopic pipeline and then along the extension pipeline into the piston cavity of the hydraulic cylinder next to the distance from the root section. The hydraulic circuit for the working fluid includes blocks for regulating the flow of the working fluid, each of these blocks, connected hydraulically with a corresponding hydraulic cylinder equipped with a built-in telescopic pipeline, has a pressure channel in which a check valve is made to ensure the movement of the working fluid flow under pressure into the piston cavity of the hydraulic cylinder , with which this block is connected, has a free drain channel, in which a check valve is made to ensure movement of the working fluid flow through the telescopic pipeline built into this hydraulic cylinder, displaced from the piston cavities of the successively retracted hydraulic cylinders, and has an adjustable drain channel in which a safety pressure head is made a valve that passes through itself the flow of working fluid displaced from the piston cavity of the hydraulic cylinder with which this unit is connected, when the pressure at the inlet to this valve reaches the pressure specified by the setting of this valve, and the setting p safety pressure valves in all blocks for regulating the flow of working fluid is designed so that the sequence of set pressure values, starting from the one closest to the root section of the block, has the form of a decreasing numerical series.;The technical result consists in increasing the reliability and durability of the hydraulic telescopic boom of the ship crane.