Loader joint energy supply hydraulic system and control method thereof

Abstract

The invention provides a loader joint energy supply hydraulic system and a control method thereof. A working metering pump and a steering metering pump of the system are connected with an engine. The working metering pump is connected with a first two-position three-way reversing valve and then divided into two path through a first check valve, the first path is connected with a rotating bucket oil cylinder and a movable arm oil cylinder through a multiway valve, and the other path is connected with an energy accumulator through a check sequence valve and a throttling valve in sequence. The steering metering pump is connected with a second two-position three-way reversing valve and then divided into three path through a second check valve, the first path is connected with an oil tank through a safety valve, the second valve is connected with the energy accumulator through a throttling valve, and the third valve is connected with a closed non-response steering gear, a limiting valve and a steering oil cylinder in sequence. The control method comprises a steering judging mode and a joint action judging mode. Through the loader joint energy supply hydraulic system, joint energy supply of a steering hydraulic system and a working hydraulic system can be achieved when the working hydraulic system needs low-pressure mass flow, and the overflowing loss and throttling loss can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of construction machinery hydraulic systems, and in particular relates to a loader combined energy supply hydraulic system and a control method thereof. Background technique [0002] Loader is a kind of engineering machinery widely used in mining, road administration, construction and other fields. The current loader hydraulic system includes quantitative system, fixed variable system and total variable system. [0003] The quantitative system has the advantages of low cost and simple structure, and is widely used in small and medium loaders. However, during the working process of the quantitative system, due to the mismatch between the output flow of the pump and the required flow of the load, the overflow loss is relatively large, resulting in a decrease in energy utilization efficiency and an increase in the temperature of the hydraulic oil, and at the same time causing the total displacement required by...

AI Technical Summary

Problems solved by technology

However, during the working process of the quantitative system, due to the mismatch between the output flow of the pump and the required flow of the load, the overflow loss is relatively large, resulting in a decrease in energy utilization efficiency and an increase in the temperature of the hydraulic oil, and at the same time causing the total displacement required by the hydraulic system of the loader Larger, the engine power demand is increased. Although advanced technologies such as double-pump confluence and double-pump confluence equivalent unloading have been developed, there are still large overflow losses and throttling losses. It is necessary to further develop new technologies. Reduce overflow loss and throttling loss

Although the variable system can effectively reduce power loss, it is expensive and will lead to an increase in the overall cost of the loader

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