Comparing what you use or technology with Zhejiang company, in the language of legal profession, is the comparison of technical characteristics. If it is the same or equivalent, it constitutes infringement.
Therefore, your own judgment is that you are similar and not necessarily infringing! If necessary, you can talk about the technology in detail, and I'll analyze it and see if I can help you avoid patents. I am both a patent agent and an intellectual property lawyer.
I hope I can help you!