Control system and control method for pitch oil cylinder of stacker-reclaimer

Abstract

The invention discloses a control system and control method for a pitch oil cylinder of a stacker-reclaimer. The control system is formed by connecting rodless cavities of a left pitch oil cylinder and a right pitch oil cylinder in an original system with an automatic flow discharge return circuit composed of a pressure relay, a pressure sensor, a proportional overflow valve and an electromagnetic on-off valve. Rod cavities of the left pitch oil cylinder and the right pitch oil cylinder are connected with an oil feeding return circuit composed of a check valve and a pipeline. The control method is that when a cantilever of the stacker-reclaimer is close to the nearby area of the lower limit of the cantilever and makes falling motion, original oil feeding to the rod cavities through a hydraulic pump is replaced with check valve oil feeding and flow discharge of the automatic flow discharge return circuit, so that return circuit oil exudation, oil leak, seal damage, even pipe explosion and other negative factors generated due to the fact that the service life of the oil cylinder is influenced by the larger pressure of the rodless cavities in an original return circuit compared with the rated working pressure of the oil cylinders are avoided, and work security and reliability of the system is guaranteed.

Description

technical field [0001] The invention relates to a pitch control system and method for an upper structural part of a stacker-reclaimer, in particular to a hydraulic control system for a stacker-reclaimer pitch cylinder, which belongs to the technical field of fluid transmission and automation control. Background technique [0002] The stacking and retrieving device for bulk materials in the stockyard of the stacker-reclaimer consists of rails, door seats, rotary platforms, upper structural parts and other parts. Among them, the upper structural parts mainly include columns, cantilevers, balance beams, counterweights and other parts. The pitching action of the stacker-reclaimer cantilever is completed by controlling the lifting action of the pitching cylinder. [0003] The load of the pitching cylinder is related to the position of the upper structure. When the cantilever is at the bottom grounding position, the center of gravity of the upper structure is tilted forward, and t...

AI Technical Summary

Problems solved by technology

[0004] In use, when the cantilever of the stacker is near the bottom end, the oil cylinder bears a large load, which generally reaches about 20 to 30 MPa, and the pressure in the rodless chamber will increase sharply to 40 to 50 MPa during operation, far exceeding that of the pitch oil cylinder. The rated working pressure not only affects the service life of the oil cylinder, but also causes the danger of oil leakage, oil leakage, seal damage or even bursting of the hydraulic circuit

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