A. The power of hydraulic system is larger than that of other power. Generally, cargo elevators are equipment with large weight, so the hydraulic system is the most suitable. In terms of structure, its output power per unit weight and output power per unit size are the most powerful among the four types of transmission modes, with a large moment inertia ratio. Under the same power transmission, the hydraulic transmission device has small volume, light weight, small inertia, compact structure and flexible layout.

B、從工作性能上看，液壓升降貨梯速度、扭矩、功率均可無級調(diào)節(jié)，動作響應(yīng)性快，能迅速換向和變速，調(diào)速范圍寬，調(diào)速范圍可達100：l到2000：1；動作快速性好，控制、調(diào)節(jié)比較簡單，操縱比較方便、省力，便于與電氣控制相配合，以及與CPU(計算機)的連接，便于實現(xiàn)自動化。液壓易與微機控制等新技術(shù)相結(jié)合，構(gòu)成“機-電-液-光”一體化已成為世界發(fā)展的潮流，便于實現(xiàn)數(shù)字化。

B. From the perspective of working performance, the speed, torque and power of the hydraulic elevator can be adjusted steplessly, and the action response is fast. It can quickly change direction and speed. The speed range is wide, and the speed range can reach 100:1 to 2000:1; The action is fast, the control and adjustment are simple, the operation is convenient and labor-saving, and it is convenient to cooperate with the electrical control, as well as the connection with the CPU (computer), so as to realize automation. The combination of hydraulic pressure and computer control and other new technologies has become the trend of world development to form the "mechanical-electrical-hydraulic optical" integration, which is easy to realize digitalization.

C、經(jīng)濟實惠，成本降低。液壓系統(tǒng)對液壓配件的要求度不高，液壓元件相對來說制造成本比較低，適應(yīng)性比較強，完成相同的任務(wù)需用的費用少。

C. Economical and low cost. The hydraulic system has low requirements for hydraulic accessories. The manufacturing cost of hydraulic components is relatively low, the adaptability is relatively strong, and the cost to complete the same task is low.

D、從使用維護上看，元件的自潤滑性好，易實現(xiàn)過載保護與保壓，可靠；元件易于實現(xiàn)系列化、標(biāo)準(zhǔn)化、通用化。

D. From the perspective of use and maintenance, the components have good self-lubrication, easy to achieve overload protection and pressure maintaining, safe and reliable; Elements are easy to realize serialization, standardization and generalization.

E、所有采用液壓技術(shù)的設(shè)備可靠性好，液壓技術(shù)的可塑性和可變性很強，可以增加柔性生產(chǎn)的柔度，和容易對生產(chǎn)程序進行改變和調(diào)整。

E. All equipment using hydraulic technology has good safety and reliability. The plasticity and variability of hydraulic technology are very strong, which can increase the flexibility of flexible production and easily change and adjust the production process.

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