Pressure difference protection system of pitching cylinder for container front stacker

Abstract

The invention claims a differential pressure protecting system for pitching oil cylinders of a container reach stacker. A hydraulic control system mainly comprises two sets of same hydraulic control systems for controlling a left pitching oil cylinder and a right pitching oil cylinder, wherein the hydraulic control system located at the left side comprises a feedback constant-pressure control module, an energy accumulator, a pressure reducing valve, an oil cylinder control valve group, a two-stage pressure regulating module, the left pitching oil cylinder, a balancing valve, an oil cylinder pressure sensor, a central feedback controller, an auxiliary feedback control driver and a gear pump; the other balancing valve is also arranged among a first oil cylinder control valve, a second oil cylinder control valve and the left pitching oil cylinder, and the other oil cylinder pressure sensor is also arranged between the balancing valve and the left pitching oil cylinder; and two ends of the balancing valve are provided with external control oil lines which are used for controlling an opening of the balancing valve, so that pressure control is realized. The differential pressure protecting system is used for protecting the pitching oil cylinders, lifting appliances and lifting appliance locks and can also be used for rapidly and stably outputting power.

Description

technical field [0001] The invention relates to a container front stacker, in particular to a pressure difference protection system for a pitching oil cylinder used for a container front stacker. Background technique [0002] At present, with the rapid development of my country's cargo logistics, more and more cargo such as containers, boxes, etc. need to be stacked together to save storage space, and the container reach stacker is a commonly used equipment for lifting containers. The reach stacker is specially designed for 20-foot and 40-foot international containers. It is mainly used for container stacking and horizontal transportation in docks and stacking plants. Compared with forklifts, it has the advantages of maneuverability, convenient operation, good stability, and wheel pressure. Lower bottom, high number of stacking layers, high utilization rate of the stacking plant, etc. Cross-box operation is possible. It is especially used for container loading and unloadin...

AI Technical Summary

Problems solved by technology

[0004] First of all, the gear pump is used in the hydraulic system, which is a quantitative pump, and it is matched with a common valve (switch valve). It is impossible to quickly and stably control the output hydraulic displacement according to the magnitude of the operator's operation of the joystick, and when the operator operates, the valve may be fully opened, and when it is closed, the valve will be fully closed, so that it is fully open and fully closed. Situations that result in wasted power absorbed by the pump

[0005] Secondly, the hydraulic system uses accumulators, and due to the difference in the weight of the goods carried by the left and right pitching cylinders, there may be multiple pressure output gears for lifting the goods, but the hydraulic system of the general front stacker cannot provide Corresponding to a variety of pressure adjustment levels, if one pressure adjustment level is used all the time, in the case of different weights, if there is no suitable corresponding pressure adjustment level, it will either lead to waste of power, or there will be a problem in the hydraulic system The possibility of internal impact, in severe cases will lead to damage to hydraulic components

[0006] Third, most of the current hydraulic systems use ordinary valves (on-off valves) to directly provide pressure oil for the cylinder to output pressure, which has the disadvantages of insufficient response speed and insufficient output flow. Or retracting the oil cylinder will cause a major safety accident in the reach stacker, which will seriously endanger the safety of the surrounding personnel and goods.

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