Simple analysis of development path of domestic loader Technology       

At present, China's loader enterprises around the energy-saving began a new round of upgrades to product technology, emphasis is placed on the core parts of the system and upgrade, upgrade the hydraulic system and hydraulic parts, transmission system and transmission parts technology. It is worth mentioning that, unlike previous domestic engineering machinery product technology roadmap, China loader industry technology upgrade has been from the simple to follow, follow the foreign advanced technology, based on the gradual transformation of the world's leading technology, through technological innovation and develop the most suitable technology China loader market.

Integration of variable and invariable in hydraulic system

At present, the international advanced hydraulic system is the hydraulic system wide variable load sensing, main components, working with the steering pump are load sensing variable pump, valve load sensing steering valve and load sensing valve. The system is characterized by the comfort of operation, high efficiency, energy saving effect is remarkable, but the cost is high, except for a few special products, in Chinese and even the whole world all less developed countries basically no or only occupies a small share of the market. To this end, China's loader industry and related industry have carried out a large number of technical innovation of the system, while maintaining its advanced nature, while large-scale manufacturing cost reduction. At present, the development and improvement work has achieved considerable success, mainly as follows several different structural types.

Improved multi way valve variable load sensing hydraulic system

The system is still a fully variable load sensing hydraulic system, and its innovation focuses on the multi way valve. The main valve is a common multiple valve with low cost, a small additional logic valve has the advantages of simple structure, two cost and less than full variable load sensing hydraulic system load sensing valve 1/4. and the performance of the system is quite popular abroad, but only about 70% of the total cost.

Hydraulic system of combined variable displacement unloading

Fixed variable confluence unloading of the steering hydraulic system is part of the load sensing variable pump with load sensing steering valve, working part by quantitative pump and ordinary valve. The system added a priority valve, shuttle valve, control valve and unloading valve, the load sensing combined constant pressure variable pump and fixed displacement pump. The steering for load sensing system, constant pressure variable work into two kinds of system model of constant pressure variable system. When the maximum load is reached and the unloading valve reaches the highest rated pressure, the work amount pump is in the state of complete unloading. The system solves the throttle and overflow loss of the steering system, as well as the overflow loss of the working system, so as to achieve the purpose of energy saving and consumption reduction.

Compared with the full variable load sensing hydraulic system, the operation comfort and operation efficiency of the system are basically the same, but the cost is only about 35% of the former, and the energy saving effect reaches about 70% of the former. Compared with the full quantitative system, the system energy saving is more than 70%, the cost is about 1.5 times. It can be said that the fixed variable confluence unloading hydraulic system is a very cost-effective system, and has certain promotional value.

Improved multi way valve constant variable combined hydraulic system

This system is basically the first two comprehensive improvement of the system, the steering part is the load sensing variable pump and load sensing steering valve, working part - valve combining by ordinary valve and a small logic valve, pump composed of quantitative pump and unloading valve, double pump confluence through priority the valve, to achieve the basic work, is the load sensing variable steering system. Compared with the variable load sensing hydraulic system, the system operating comfort and work efficiency and the cost is quite basic, but only the former is about 50%; compared with the quantitative system, the system works well, the cost is about 2 times that of the former. It can be said that the system is a cheap, cost-effective, good system, has a high value of promotion.