本发明公开了飞机高温环境测试用热空气置换系统及其置换方法，属于飞机测试技术领域，置换系统包括进气组件、保温箱、排气组件和PLC控制器；进气组件包括依次连接的空压机、冻干机和空气过滤器，保温箱与空气过滤器连接，排气组件包括排气管、活动阀芯、推动板和气动推杆；排气管贯穿保温箱底部，活动阀芯滑动卡接在排气管内部上端，推动板卡接在保温箱底部内侧，且与活动阀芯抵接；气动推杆设在保温箱底部内侧，气动推杆的伸缩端与推动板抵接，保温箱底部设有为气动推杆提供动力的电动缸；PLC控制器分别与各用电设备电性连接；本发明置换系统结构设计合理，能够保证飞机高温环境测试时实验室全温度范围的正常数据采集，适宜推广使用。

The invention discloses a hot air replacement system for airplane high-temperature environment testing and a replacement method thereof, and belongs to the technical field of airplane testing. The replacement system comprises an air inlet assembly, a heat preservation box, an exhaust assembly and a PLC; the air inlet assembly comprises an air compressor, a freeze dryer and an air filter which are sequentially connected, the heat preservation box is connected with the air filter, and the exhaust assembly comprises an exhaust pipe, a movable valve element, a push plate and a pneumatic push rod; the exhaust pipe penetrates through the bottom of the heat preservation box, the movable valve element is slidably clamped to the upper end in the exhaust pipe, and the pushing plate is clamped to the inner side of the bottom of the heat preservation box and abuts against the movable valve element. The pneumatic push rod is arranged on the inner side of the bottom of the heat preservation box, the telescopic end of the pneumatic push rod abuts against the push plate, and an electric cylinder providing power for the pneumatic push rod is arranged at the bottom of the heat preservation box. The PLC is electrically connected with each electric device; the replacement system is reasonable in structural design, can guarantee normal data collection in a whole temperature range of a laboratory when an airplane is tested in a high-temperature environment, and is suitable for popularization and application.