Energy saving will be - Liugong CLG856H constant variable system loader
June 15, 2015, Changzhou, Jiangsu. At the global launch conference of Liugong large equipment, Liugong released a new CLG856H constant variable system loader to global users. Liugong CLG856H constant variable system loader is a mid-to-high-end new product carefully developed by Liugong based on more than 50 years of loader development technology, based on the new generation H series loader main model CLG856H, in addition to having “made 5 tonsâ€. The king of the machine" - CLG856H has many excellent genes, but also has better energy saving effect, representing the advanced technology level of domestic loaders at this stage.
As is known, the steering mechanism and working device of the wheel loader are hydraulically driven. It can be said that hydraulic technology is one of the key technologies of engineering machinery. Under the premise of ensuring 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 points for 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 working unit hydraulic system and the steering hydraulic system are driven by two quantitative gear pumps. At the same speed, the output flow of the two dosing pumps remains constant and does not change as the load changes. However, in the actual construction operation, the load of the loader working device changes frequently and the range of variation is large, which leads to the surplus flow provided by the steering quantitative pump. In addition to the combined flow to the working device, it also generates high pressure overflow (when the working device is shovel) or low pressure. Overflow (when the boom is slowly raised), that is to say, this part of the flow is wasted, that is, this part of the engine that drives the hydraulic pump is wasted - in the end, this part of the fuel is consumed in vain.
Therefore, based on energy saving considerations, in recent years, the hydraulic system of the loader working device driven by the fixed pump has been gradually replaced by a new type of hydraulic system that is energy-saving. The new energy-saving hydraulic system includes a fixed-variable or full-variable hydraulic system.
In the model of the Liugong CLG856H, the fixed-variable steering hydraulic system can be selected according to the customer's needs. The introduction of this system makes Liugong loader more prominent in energy saving and consumption reduction. The constant variable is turned to the hydraulic system, and the main pump is still a fixed pump. However, the steering pump replaces the quantitative gear pump with a variable displacement piston pump, and the combined shuttle valve, control valve and related control lines are added to make it a certain variable pump control. Type constant variable load sensing control hydraulic system. Liugong loader load sensing hydraulic device (LUDV working system) obtained national patent.
The characteristic of the constant variable steering hydraulic system is that the steering pump (variable piston pump) only needs to provide a small hydraulic flow when the machine is not turning (unlike the fixed pump always needs to provide a constant flow, thus requiring the maintenance of engine power). When the machine needs to be turned, the steering pump is controlled by the load sensing system according to the steering demand, automatically providing 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 quantitative system requires “fixed production†for the steering pump, while the variable-variable system requires “production on demandâ€. It can be seen that the constant variable system is beneficial to reduce the power loss of the engine, thereby achieving the purpose of energy saving and consumption reduction. The introduction of the Liugong fixed-variable system model marks a new step in the energy-saving technology of Liugong loader products.
â– Comparison of the working principle of the constant variable system and the traditional quantitative system:
â– Feature comparison:
In summary, the advantage of the Liugong CLG856H constant-variable system loader is: Effectively reduce the overflow loss of the hydraulic system and achieve energy-saving effect. Through many actual construction test tests, fuel consumption can be saved by 12%-15% under the correct operating habits. Improve steering performance, especially at low speeds. The steering operation is lighter, more flexible, more precise, the driver's labor intensity is reduced, and the comfort is improved. To some extent, the oil temperature of the hydraulic system is lowered, and the reliability and service life of components related to the hydraulic system are improved.
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