If the writing document only writes the structure, then (invention), the examiner can easily find this similar mechanical structure and reject you. Therefore, it can be explained in detail in the name and specification, such as a device for producing XXX, and the mechanical steps and operation steps for producing XXX can be improved in the specification.
If the structure is similar, it depends on whether you have any other improvements. Use? Structure can't produce effects in other people's patents.
It is still very quick and simple to apply for a patent for utility model now. Please consult the agency for details.