Common problems and improvement methods of steel core aluminum stranded wire quality

The steel-cored aluminum stranded wire is made of stranded aluminum wire and steel wire. It is widely used in overhead transmission lines, and its quality directly affects the safety of power transmission. This paper will discuss the main reasons and improvement methods affecting the quality of steel core aluminum stranded wire.

First, the twisted wire process.

1. Single line break:

main reason:

1) The single-wire online disk is loosely wound, or the single-wire online position is too tight;

2) The threading pipe is grooved to break the wire due to friction; the single wire is knotted, or the pay wire is braked tightly.

the measures taken:

1) Check whether there is any unevenness or pressure line on the single wire. Pay attention to the tidy wire in the wire drawing process;

2) Replace the worn pipe with serious wear in time;

3) Check whether the top rotation of the reel is flexible, and ensure that the bearing is well lubricated;

4) Check if the tension setting of the pay-off reel is uniform, and adjust the tension according to the actual situation.

2. Single line arching, loose, serpentine bend

main reason:

1) The choice of pitch diameter ratio is unreasonable;

2) The position and distribution of each single line on the stranding plate of the stranded cage are uneven;

3) The die orifice is too large;

4) Individual single wire tension is too large.

the measures taken:

1) First select the appropriate pitch diameter ratio, twisting rate, stranding pitch length and twisting direction before production. They have a direct impact on product quality, stability, strength, electrical resistance and material consumption;

2) Reasonably adjust the position distribution of the single line on the distribution board according to the work experience;

3) Selecting a suitable pressure cell, generally requires that the die diameter be smaller than the wire outer diameter by 0.3-0.5mm;

4) It is necessary to adjust the tension of the pay-off reel reasonably to ensure that the tension of each single thread is moderate and consistent;

5) Adjust the back-twisting device so that the angles are the same to eliminate the internal stress generated during the machining process;

6) Try to reduce the number of stops during the stranding process and try to produce at a constant speed.

Second, production management

In the production process, it is necessary to strictly control the quality of incoming raw materials; pay attention to avoid mechanical damage caused by bumps during transportation; pay attention to the storage location of aluminum wires, and avoid damage caused by corrosive medium humid air.