The currently used PU polyurethane roller includes a hub, a bearing in the hub, and a polyurethane bead layer made of low free polymer. The hub is provided with an annular wall and an inner wall, an annular outer wall and annular surfaces of two side surfaces, and the surfaces connecting the inner wall surface and the outer wall surface are provided with a pair of annular grooves. Compared with the prior art, the polyurethane layer is coated on the outer wall of the annular wall and fills the grooves on the annular surface.

Now, the structural design of the wheel hub is optimized, so that the dynamic performance and load of the whole wheel are optimized to ensure a short service life, and the capacity can be greatly improved. When maintaining PU polyurethane wheels, the cast iron of the wheel core is degummed, and maintaining the cast iron of the wheel core is also the key to prevent the core of PU polyurethane wheels from being removed. In order to ensure a good mixture of polyurethane elastomer and iron core, it is necessary to perform maintenance treatment on the iron core, such as etching and oxide removal, organic matter used to remove oil, etc., to ensure that the surface is maintained without dirt.

At present, the new PU polyurethane roller field, which is resistant to the high temperature of polyurethane roller, includes a central shaft, and its structure is set on the central shaft. Through the effect of air channel, the heat generated by the outer annular roller is dissipated, and the width of the heat dissipation groove is gradually increased from inside to outside, which can prevent the locking device in the heat dissipation groove and groove cooperation to make the outer roller ring and rod more stable.