Technological innovation belongs to the innovation of methods or processes, and only invention patents can be declared.
If the structure of the equipment is innovative, you can apply for a patent. If the function of the equipment is changed due to the change of the structure, you can declare it as an invention patent or a utility model patent. But you can't declare a patent for appearance, which is the difference between appearance and other products.
However, if the change of its structure does not lead to the change of its function, but only makes it look different from other products, then only the appearance patent can be declared.