A patented technology used in rice cookers, if used in soymilk machine, is it an infringement?

You belong to transformation invention, which refers to the invention that transfers the existing technology in one technical field to other technical fields.

If this diversion can produce unexpected technical effects, or overcome the difficulties not encountered in the original technical field, then this diversion can be authorized. At this time, it is not infringement. On the contrary, infringement.

For example, the supporting structure of the cabinet is transferred to the supporting structure of the table,

However, this misappropriated invention cannot be authorized, because it can not produce unexpected technical effects, nor can it overcome the difficulties that have never been encountered in the original technical field.

Another example is:

The invention relates to an aileron of a submarine. In the prior art, when a submarine dives into the water, it stays at any point in balance with the buoyancy generated by the water, and when it ascends, it generates buoyancy by manipulating the horizontal cabin, while the plane floats in the air entirely by the buoyancy generated by the main wing during navigation. According to the invention, the technical means in the airplane are used for reference, and the main wing of the airplane is used for the submarine, so that the submarine generates buoyancy lift or settling force under the action of the movable plate which plays the role of aileron, thereby greatly improving the lift performance of the submarine. Because many technical difficulties need to be overcome when aviation technology is applied to water, and the invention has achieved excellent results, the invention is creative.

So you need to compare the technical content of the field you want to apply for, whether your conversion can produce unexpected technical effects, or overcome the difficulties that have not been encountered in the original technical field.