China News Service, Jiuquan, June 18 (Guo Chaokai and Fu Yingli) China successfully launched the Shenzhou 12 spacecraft with the Long March 2 F Yao 12 rocket at the Jiuquan Satellite Launch Center on the 17th. This mission is the first manned flight of the Chinese space station. .

　　During the construction and operation phase of the space station orbit, if the space station or the spacecraft is in serious danger or malfunction, the ground must quickly launch a rescue spacecraft to retrieve the astronauts.

Therefore, starting from the Yao-13 rocket, the Long March 2F carrier rocket ("Chang 2 F rocket") developed by the China Academy of Launch Vehicle Technology affiliated to China Aerospace Science and Technology Corporation Limited has been on emergency rescue duty within 10 days at the earliest. Can launch.

　　Parallel operation

　　Starting from the Yao 12 and Yao 13 rockets, the Changer F rocket adopts the "rolling backup" launch mode of "1 launch and 1 backup".

Take the Yao 12 and Yao 13 rockets as an example. Two rockets enter the field at the same time. First, the Yao 13 rocket assembly test will be carried out, and then the Yao 12 rocket assembly test and launch work will be carried out.

There is a crossover between the two rockets, and the model teams work in parallel.

　　This is a big challenge for the Chang-2F rocket, which has a low launch density. However, the developers have overcome many difficulties and through extraordinary work to ensure that the Yao 13 rocket completes the basic stage and the basic stage before the launch of the Yao 12 rocket. The fairing (half-shield) and escape tower are assembled and tested and sealed in the factory building. They enter the emergency duty state and have emergency launch capabilities.

　　The rocket on duty can be launched within 10 days as soon as possible

　　If the accident does come, after receiving an emergency rescue order, the Changer-2 F rocket's basic stage, fairing (half dome) and escape tower can immediately carry out work synchronously and efficiently.

　　The model team compiled an emergency launch process, further optimized the launch site process, reduced repetitive test items, extended the emergency work time in a single day, and greatly shortened the launch cycle.

　　According to Chang Wuquan, the chief designer of the 2nd F rocket of the China Academy of Launch Vehicle Technology, the basic stage of the rocket will be transferred from the technical area to the launch area after an emergency state recovery and necessary inspections, and the corresponding docking and state inspection preparations will continue. jobs.

At the same time, the fairing and escape tower respectively completed the buckle and assembly work, and then went to the launch area to "rendezvous" with the basic stage of the rocket.

After the necessary functional inspections and tests, the rocket enters the launch state, and the entire process is extremely efficient.

　　According to the specific requirements of the emergency rescue mission of the space station, the Chang-2F rocket has two emergency launch capabilities within 10 days and 20 days, and can quickly launch the spacecraft to safely retrieve the astronauts.

　　Stored upright for half a year

　　Of course, there is another most gratifying situation. Everything is going well on the space station, and the on-duty rocket has been quietly waiting in the technical position until it shifts to the normal launch process for the next mission.

This cycle may be as long as six months.

　　So, will long-term erection and storage have an adverse effect on the product?

According to Chang Wuquan, after a lot of analysis and testing, the model team believes that it can withstand these changes and will not be affected.

　　When the rocket is erected and stored, must all stand-alone machines and products be installed?

In consideration of safety and other factors, the model team decided after analysis that some arrow batteries and pyrotechnic devices will not be installed temporarily and stored in a special warehouse.

In this way, even if an emergency rescue mission is received, the launch can be carried out within the specified time.

　　Experts say that the Changer 2 F rocket, "General Victory", has always been invincible and galloping across the sky.

Now, although the duty system is implemented, it is hoped that accidents will never come during the construction and operation of my country's space station in the future, and the Chang-2F rockets on duty will never have to "take on duty" in an emergency.

(Finish)