Energy Saver Liugong CLG856H Fixed-Value System Loader

Liugong CLG856H fixed-variable system loader

Liugong CLG856H fixed-variable system loader

As we all know, the wheel loader steering mechanism and work equipment are hydraulically driven. It can be said that hydraulic technology is one of the key technologies for construction machinery. Under the premise of guaranteeing steering and working performance, reducing the energy loss (energy saving) of the hydraulic system and reducing the oil temperature of the hydraulic system (improving the reliability of the machine) is one of the key considerations in the improvement of the loader technology.
At present, most of the loaders on the market, the hydraulic system is generally a quantitative hydraulic system with load sensing control steering, and has a dual pump confluence function. The two hydraulic systems of the loader, the work unit hydraulic system and the steering hydraulic system, are respectively driven by two fixed gear pumps. At the same speed, the output flow of both metering pumps remains constant and does not change according to the load. However, in the actual construction operation, the load of the loader work device changes frequently and the range of change is large, resulting in excess flow provided by the steering quantitative pump. In addition to confluence to the working device, high pressure overflow (when the working device is excavated) or low pressure is generated. Overflow (when the boom is slowly raised), that is to say, this part of the flow is wasted, which means that the power of the engine driving the hydraulic pump is wasted - in the final analysis, this part of the fuel is consumed in vain.

Liugong CLG856H fixed-variable system loader

Liugong CLG856H fixed-variable system loader

Therefore, based on the consideration of energy saving, in recent years, the hydraulic system of a loader working device driven by a quantitative pump has gradually been replaced by a new energy-saving hydraulic system. The new energy-saving hydraulic system includes a fixed-variable or full-variable hydraulic system.
In the Liugong CLG856H with the models, according to the needs of customers, choose fixed variable steering hydraulic system. The introduction of this system makes the Liugong loader more prominent in terms of energy saving and consumption reduction. Fixed-point steering hydraulic system, the work of the main pump is still a quantitative pump, but the steering pump variable piston pump to replace the quantitative gear pump, increase the combination of shuttle valve, control valve and related control lines, so that it becomes a certain change in the pump control A fixed variable load sensing control hydraulic system. Liugong loader load sensing hydraulic device (LUDV working system) obtained national patent.
The characteristic of the fixed-variable steering hydraulic system is that when the machine is not turning, the steering pump (variable piston pump) only needs to provide a small hydraulic flow (unlike that the constant-rate pump always needs to provide a constant flow, which requires the maintenance of the engine power. When the machine needs to turn, the steering pump is controlled by the load sensing system according to the steering demand and automatically provides the flow - thereby reducing unnecessary overflow losses. At the same time, the efficiency matching problem of the steering hydraulic system of the loader under various working conditions is solved, and the working speed of the steering cylinder is independent of the load change, which increases the working stiffness of the steering system and makes the steering quick, accurate and stable.
In short, the requirements of the dosing system for steering pumps are “fixed production”, while the fixed-variable systems require “production on demand”. From this we can see that the fixed-variable system is beneficial to reduce the engine power loss, so as to achieve the purpose of energy saving. The introduction of Liugong's fixed-variable system model marks a new step in the energy-saving technology of Liugong's loader products.
Comparison between fixed-variable systems and traditional quantitative systems:

Feature comparison:

In summary, the advantages of the Liugong CLG856H fixed-variable system loader are:
Effectively reduce the hydraulic system overflow loss, to achieve the effect of energy saving. Through many practical construction job tests, under the correct operating habits, fuel consumption can be saved by 12%-15%.
Improve steering performance, especially at low speeds. The steering operation is lighter, more flexible, and more accurate. The driver's labor intensity is reduced and comfort is improved.
To a certain extent, the oil temperature of the hydraulic system is reduced, and the reliability and service life of the related components of the hydraulic system are improved. (This article from the Liugong click to enter the Liugong online purchase page )