Front lifting crane and hydraulic steering system thereof

Abstract

The invention discloses a hydraulic steering system for a front lifting crane. The hydraulic steering system is provided with a front shaft, a rear shaft and a steering device which is used for controlling the steering loop of a driving steering shaft, wherein both the front shaft and the rear shaft are both steering shafts, either the front shaft or the rear shaft serves as the driving steering shaft, and the other one serves as a driven steering shaft. The steering system further comprises a hydraulic valve and a controller, wherein the hydraulic valve is used for controlling the steering loop of the driven steering shaft, and the controller is used for outputting a control signal to the hydraulic valve according to a steering mode determined by user instructions, so as to adjust the flowing direction and flow rate of the steering loop of the driven steering shaft. Compared with the prior art, the steering system for the front lifting crane, disclosed by the invention, has the advantage that the requirements on two aspects, namely the performance of the steering system and the service lives of wheels, can be met effectively. Based on the steering system, the invention further provides the front lifting crane using the steering system.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a front load crane and a hydraulic steering system thereof. Background technique [0002] With the rapid development of economic construction, the scale of lifting at airports and ports is also increasing, and the demand for lifting equipment is gradually showing a trend of specialization. In particular, the wide application of international standard containers has put forward higher requirements for container handling and stacking operations in small and medium-sized ports, railway transfer stations and road transfer stations. [0003] The use sites of reach stacker cranes are mostly storage yards and wharves. Relatively speaking, the site is small, and the requirements for its maneuverability are high; most of the working conditions are walking with boxes. When walking with boxes, the front axle bears the weight of the whole machine. (80-85)% of the weight, the s...

AI Technical Summary

Problems solved by technology

[0005] First, the larger rear wheel angles can cause severe tire wear

When the rear wheel angle reaches a certain value, the front wheel on the inside of the turn is basically in a sliding state, and there is a strong sliding friction between it and the ground; at the same time, the front wheel bears about (80-85)% of the load of the whole machine when the product is working. The enormous load further increases the wear on the front wheels

[0006] Secondly, due to the large steering angle and frequent steering actions, the rear wheel rim of the product quickly reaches its fatigue limit and is damaged, resulting in safety accidents; at the same time, the wear of the rear tires is also very serious

At present, the replacement cycle of such reach stacker crane tires is generally 3 to 6 months, and the user's use and maintenance costs are very high

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