An MFPT plastic-steel composite cable conduit

Abstract

The invention provides an MFPT plastic-steel composite cable conduit. The outer surface of the plastic inner tube is wound with knotted glass fibers, The outer surface of the plastic inner tube is heated and softened when the glass fiber is wound so that the lower half of the knot is embedded in the outer surface of the plastic inner tube. The glass fiber and the knot on the glass fiber outer tubeare impregnated with resin glue when the glass fiber is wrapped, and the glass fiber and the knot on the glass fiber outer tube are also solidified and formed into a part of the glass fiber outer tube. In the invention, the inner surface of the plastic inner pipe is smooth, which is very advantageous for threading; After forming, the glass fiber and the knot on the glass fiber are also solidifiedand formed into a part of the outer tube of the glass fiber reinforced plastic (FRP), and the overall strength is high; The lower part of the joint on the glass fiber is embedded in the outer surfaceof the plastic inner pipe, so that the bonding force between the inner and outer pipes is increased, and the inner and outer pipes are not delaminated after long-term use. Therefore, the invention has the characteristics of simple structure, reasonable design and the like.

Description

technical field [0001] The invention belongs to a cable guide, in particular to a MFPT plastic-steel composite cable guide. Background technique [0002] MFPT plastic-steel composite cable conduit, where M represents modification, F represents thermosetting FRP composite material, P represents thermoplastic, and T represents cable conduit. It is a combination of thermosetting plastic and thermoplastic plastic as a whole. The advantages of the two are complementary, high strength and heat resistance. , Corrosion resistance, flame retardant, economical and practical. It can be seen from the search that in order to combine thermosetting plastics and thermoplastic plastics into a whole, the patent of "a kind of low-resistance wear-resistant sand-insulated plastic-steel composite cable conduit with bumps" with the publication number CN204651860U is improved by designing the outer surface of the inner tube. There are bumps and quartz sand between the glass filament and the inner ...

AI Technical Summary

Problems solved by technology

It can be seen from the search that in order to combine thermosetting plastics and thermoplastic plastics into a whole, the patent of "a kind of low-resistance wear-resistant sand-insulated plastic-steel composite cable conduit with bumps" with the publication number CN204651860U is improved by designing the outer surface of the inner tube. There are bumps and quartz sand between the glass filament and the inner tube. The quartz sand and hemispherical bumps can increase the friction between the inner and outer tubes, but it increases the difficulty of manufacturing the inner tube, and the quartz sand is impregnated with glue The strength of the solidified transition layer is low; the patent of "a low-resistance and wear-resistant plastic-steel composite cable with an intermediate bonding layer" with the publication number CN203967702U has an improvement point that the outer surface of the inner tube is coated with a layer along the axial direction of the inner tube. The intermediate adhesive layer tightly combines the inner and outer pipes into a whole. This method is not easy to control the amount and uniformity of the coating adhesive. Too much or too little adhesive will reduce the distance between the inner and outer pipes. The bonding force between the inner tube and the plastic material polymer chain of the inner tube is non-polar and inert. At present, there is no adhesive that can solve the problem of bonding the inner and outer tubes well. Experiments have proved that the plastic inner tube and the FRP outer tube are not compatible. After treatment, it is directly compounded with adhesive, and it is easy to cause delamination between the two, which cannot meet the needs of construction.

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