The hydraulic drive system is an important part of the fixed boarding bridge. It needs to meet all the technical requirements for the use function of the boarding bridge during design, such as good static and dynamic performance, high work efficiency, safety and reliability, simple structure, good economic performance, convenient use and maintenance, etc. In order to meet the requirements, it is necessary to clarify the determination principle of the boarding bridge parameters related to the hydraulic drive system, and comprehensively consider the overall design of the boarding bridge to achieve the mutual coordination of machinery, electricity and hydraulic to ensure the overall performance of the boarding bridge. According to the specific conditions of the boarding bridge, the following problems need to be solved in actual use:

1、由于登车桥采用的是两台液压马达分别驱动四根油缸，因此，需要保证液压系统具有较高的同步控制准确度；

1. Since the boarding bridge uses two hydraulic motors to drive four oil cylinders respectively, it is necessary to ensure that the hydraulic system has high synchronous control accuracy;

2、下降过程中的反向负载会引起失重现象，需要加以控制，尤其是对于大型设备来说，一旦出现失控，会带来非常严重的后果；

2. The reverse load in the descending process will cause weight loss, which needs to be controlled, especially for large equipment, once out of control, it will bring very serious consequences;

3、保证动作平稳，固定登车桥上载重量变化很大，且机械传动零件加工、安装的误差以及台面的偏载，都会引起液压马达负载的大幅度变化，液压系统需要能克服负载变化对速度产生的影响，确保机构无冲击地平稳运行；

3. To ensure smooth operation, the loading weight of the fixed boarding axle changes greatly, and the machining and installation errors of mechanical transmission parts and the eccentric load of the table will cause a large change in the load of the hydraulic motor. The hydraulic system needs to be able to overcome the impact of the load change on the speed and ensure the smooth and stable operation of the mechanism without impact;

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