72hrs free Transit for Sri Lankan National living in UAE

I have been living in Dubai, UAE for the past 21yrs on a Employment Visa.
Nationality : Sri Lankan
I am employed with Globe Air Cargo FZE as Managing Director for the past 11yrs. I have received an invitation for a meeting in Chengdu from Mr. Edward Zhou of Sichuan Airlines Cargo (Mobile : +86 13880431269) scheduled for 28-29JUN.
I will be in Chengdu for less than 72hrs and will depart for Singapore from Chengdu.
Please advise if I would be able to get the 72hrs free Transit on arrival.
Shiranka Leo.