Product Introduction

Ductile iron manhole covers are mainly made of ductile iron manhole covers, and the quality of this manhole cover involves the problem of spheroidization rate. The commonly used coating for the treatment of castings is anti-rust asphalt paint, of course, the surface of the ductile iron manhole cover is also treated by spraying anti-rust asphalt paint. Ductile iron manhole cover has one advantage, that is, due to the high strength and good toughness of ductile iron, the ductile iron manhole cover is about 30% lighter than the same type of gray cast iron manhole cover.

Aube ductile iron, grade QT900-02, has high strength and wear resistance, its comprehensive mechanical properties are high, often used to make locomotive wheels such as to withstand heavy loads, friction and impact parts. Ferritic ductile iron, grades QT400-17, QT400-15, QT450-10, with low strength, but high toughness characteristics, mainly used to withstand a lot of impact and vibration parts, such as some vehicle chassis parts. Carbon nodular iron, QT500-07, QT600-03, with high strength, good toughness characteristics, mainly used in the manufacture of some vehicle parts.

If the square is selected, because the diagonal of the square is obviously longer than the length of each side, such a manhole cover is rolled up, it is simple to fall into the well along the diagonal direction of the wellhead, forming a hidden danger. If the well head is rounded or significantly smaller than the cap, the square cap will not fall into the well. There is a problem of data use and saving here. Square ductile iron manhole covers are generally used in rural areas and cables, so as to prevent the entry of liquids such as rain. The following is a detailed introduction to the detailed installation method of the ductile iron manhole cover device frame (mold) after the cast iron ductile iron manhole cover is fixed, before filling the asphalt material, clean the working pit first, and then evenly sprinkle the asphalt through the court oil, in order to increase the adhesive force of the asphalt and the original structure, when filling the asphalt, it is necessary to use the tamper layer compaction to ensure that the density meets the relevant requirements. The height of the asphalt filler should be consistent with the top surface of the cast iron device frame (die).

When we drive over the manhole cover, we often make a "clanging" sound, which is because the manhole cover is settling and the height is caused by the abnormal sound. In many cities, the road is still dominated by ordinary cast iron manhole covers, affected by the principle structure of the manhole cover itself and the filling process, coupled with the rolling of heavy vehicles for a long time, often there will be subsidence, well rupture and other diseases, not only bring noise, but also affect the citizens' driving experience and traffic. The new anti-settling manhole cover structure is wider than the ordinary manhole cover, the manhole cover bearing area is increased, and has the advantages of anti-sinking, anti-theft, anti-loosening, anti-abnormal sound and so on.

Detection Systems

Copper Silica Sol Investment Casting

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