2 transit visa

Hello! I'm planning to come to Shanghai from dubai and spend 5 days in Shanghai with a transit entry permit. After I'll fly to HK for 2 days and come back to Shanghai for 2 more days, and after going back to Dubai. So, will i be allowed to enter Shanghai with one more transit entry permit?
In short, the plan is:
Dubai - Shanghai 5 days - Hongkong 2 days - Shanghai 2 days - Dubai