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Technical application of cold shrinkable cable accessories

2022-12-07
It is well known that rubber has the property of "elastic memory" or elastic retraction force, which is used to form the cold shrinkage technology. Cold shrinkage technology is also pre-expansion technology, that is, the rubber parts formed in the elastic range of expansion molding, built-in support strip, when used, set into the rubber parts to pull out the support. The rubber parts shrink rapidly on the covered objects at room temperature to form a whole. The cold shrinkable cable accessories are prepared by the elastic memory principle of rubber.

Shape of expansion

The expansion equipment of cold shrinkable cable accessories is non-standard equipment, and whether the design of expansion equipment is scientific and whether the expansion process control is good or not directly affects the quality of the product and plays a positive role in the long-term safe operation of the cable. The manufacturing methods of cold shrinkable cable accessories can be generally summarized as pneumatic expansion method and mechanical expansion method.

1. Pneumatic expansion method: A certain pressure is provided to expand products through compressed air and vacuum, that is, a certain air pressure is filled into the pipe, negative pressure is applied outside the pipe to expand, and support strips are put in. This method has a large radial expansion rate and smooth inner and outer walls of the pipe without defects, which is a more practical expansion method.

2. Mechanical expansion method: the use of mechanical movement to expand or stretch products, with steel wire support skeleton cone rod inserted expansion, into the support bar, longitudinal stretch is almost zero, but the steel wire is easy to damage the inner wall of the pipe, resulting in defects.
cold shrinkable termination kit

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