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、由于登車橋采用的是兩臺(tái)液壓馬達(dá)分別驅(qū)動(dòng)四根油缸，因此，需要保證液壓系統(tǒng)具有較高的同步控制準(zhǔn)確度；

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、下降過程中的反向負(fù)載會(huì)引起失重現(xiàn)象，需要加以控制，尤其是對于大型設(shè)備來說，一旦出現(xiàn)失控，會(huì)帶來非常嚴(yán)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、保證動(dòng)作平穩(wěn)，固定登車橋上載重量變化很大，且機(jī)械傳動(dòng)零件加工、安裝的誤差以及臺(tái)面的偏載，都會(huì)引起液壓馬達(dá)負(fù)載的大幅度變化，液壓系統(tǒng)需要能克服負(fù)載變化對速度產(chǎn)生的影響，確保機(jī)構(gòu)無沖擊地平穩(wěn)運(yùn)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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