【Haichuan Equipment Guessing Game】Why don’t these bicycles have wheels? The people I know must be really great!
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This post was last edited by HaiChuanLaoYu on 2026-1-5 10:16
The civil air defense foot-operated fan is an emergency ventilation device designed for use in wartime. Its main function is to provide air circulation through manual operation, ensuring that the pressure inside the air shelter is higher than that outside, thereby preventing toxic gases from entering and safeguarding the living conditions of people there.
The 【Haichuan Equipment Guessing】 series will continue to be updated in 2027 – all Haichuan fans are welcome to participate actively! https://bbs.hcbbs.com/thread-2079686-1-1.html (Source: Haichuan Chemical Industry Forum (Hua Haichuan Liu hcbbs))
I guess he must be in his seventies or eighties already:o
Is this an exhibit or a site in use? Seeing that exposed belt gave me the creeps
【Ten Years of Rapid Development in Chemical Engineering Equipment】China Petrochemical’s First Supercritical Once-Through Reheating Unit Successfully Commissioned 2952-2025 https://bbs.hcbbs.com/thread-5710462-1-1.html (Source: Haichuan Chemical Industry Forum (HCBBS))
This is a manual fan; we used to have one in the laboratory that worked with perfluorinated oils, and it was used to ensure ventilation when there was a sudden power outage – several people were needed to operate it. Human lives are at stake; it could be considered an emergency backup ventilation measure at that time. There should be quite a few such devices in the third-tier areas