1. The surface layer of Shandong nodular cast iron manhole cover will not have obvious welding defects, and the forging pattern design is relatively clear.
2. When checking its diameter, it should be held by special items. After operating its support frame within the size range of the well cover, the deep layer is specified as 40mm. When inspecting the anchor bolt hole, it should be checked one by one with special inspection tools.
3. Flatness inspection of speed nodular cast iron manhole cover: the inspection items of special mold sleeve can be accepted during the inspection time.
4. Check the spraying results and composition results. The ductile iron manhole cover of the manhole is not easy to swing and sound after being placed and used, and the distance between the manhole cover and the well frame is 1mm.
In the case of inspecting the quality of well ring and manhole cover, in addition to inspecting its surface, diameter and spraying results, we must also improve the renewal, transformation and improvement of ball mill nodular cast iron manhole cover, so that it can be applied as soon as possible, which can also ensure its application in the future.
Nodular cast iron manhole covers play an important role in the city. We should pay great attention to their quality when selecting products. Only in this way can there be no mistakes in use. Therefore, manufacturers should pay attention to the correct methods when making.