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、从工作性能上看，液压升降货梯速度、扭矩、功率均可无级调节，动作响应性快，能迅速换向和变速，调速范围宽，调速范围可达100：l到2000：1；动作快速性好，控制、调节比较简单，操纵比较方便、省力，便于与电气控制相配合，以及与CPU(计算机)的连接，便于实现自动化。液压易与微机控制等新技术相结合，构成“机-电-液-光”一体化已成为世界发展的潮流，便于实现数字化。

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、经济实惠，成本降低。液压系统对液压配件的要求度不高，液压元件相对来说制造成本比较低，适应性比较强，完成相同的任务需用的费用少。

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、从使用维护上看，元件的自润滑性好，易实现过载保护与保压，可靠；元件易于实现系列化、标准化、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、所有采用液压技术的设备可靠性好，液压技术的可塑性和可变性很强，可以增加柔性生产的柔度，和容易对生产程序进行改变和调整。

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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