Larger cross-section of three-core or four-core low-voltage power cables, conductive cores are generally fan-shaped structure, which can greatly reduce the diameter of the cable, save cable sheathing materials, so that the cost reduction of 15% to 20%, and therefore has a better economic efficiency.

My company in the past in the fan-shaped insulated core cable, sometimes the core will turn over, which not only fails to reduce the core diameter, reduce the cost of the design purpose, but also serious damage to the cable, affecting the appearance of the cable l in order to prevent the core to turn over, the need for frequent pre-twisting of the core, not only a serious impact on productivity, but also to the pre-twisting equipment caused by damage. In order to solve this problem, the principle of repeated demonstration and practical tests, we found that the following set of simple fan-shaped rolling wheel device, can completely eliminate the fan-shaped core into the cable turn over.

1. Program measures

In each fan-shaped wire core into the stranding of the front section, each installed a pair of fan-shaped rolling wheel, as shown in the figure, in order to make the cable stranding platform before the fan-shaped wire core and stranding cage axis core of the relative angle to remain fixed, this fan-shaped rolling wheel, can be applied to all fan-shaped or semi-circular wire core, and it will not damage the core insulation. The specific size of the figure, is determined by the choice of bearing outer diameter.

2. Principle description

To ensure that the fan-shaped core cable stranding roundness, in each of the cable pitch, the core must have a certain degree of bending in addition to the core should also be twisted one week. Once the core is not properly twisted, it will turn over. In the fan-shaped wire core stranded before the platform, the use of fan-shaped rolling wheel to control the core and cage axis of the relative angle, can make the fan-shaped wire core in the process of cable generation uniform torsion, and to ensure that in each cable pitch within the core of a week's torsional deformation, so that the fan-shaped wire core into the cable movement in line with the law.

I also found that the fan-shaped core cable and armored cable tape winding principle is the same. We can take the fan-shaped core of the arc as a curved steel belt, and other parts of the circle can be used as a curved steel belt to be wrapped around the core of the cable. Such a comparison, can make everyone from the steel belt guide pulleys

4. Water cooling of casting machine

Cooling water is used to cool the crystallizing wheel and the steel belt. The nozzles for the cooling water are specially designed and manufactured. The cooling water of the steel belt sprayed by the nozzle should be in the shape of a bowl, so that the cooling of the steel belt is more uniform. The cooling water of the crystallization wheel should be fan-shaped when it is sprayed from the nozzle. These cooling water mainly cooling crystallization wheel cross-section of the surrounding, thus determining the casting of the billet when casting the direction of heat dissipation and the formation of billet internal columnar crystal direction.

Cooling water a total of eight areas, namely, steel belt 1 area, steel belt 2 area I crystallization wheel l medical, crystallization wheel 2 medical, crystallization wheel of the two sides of the cooling area; Pressure wheel cooling medical, mold releasing device cooling area. Important cooling area for the band l area, crystallization wheel l medical and pressure wheel at the cold to go area, these three cooling area determines the internal quality of the billet good or bad the rest of the cooling area is to control the billet into the rolling temperature, the crystallization wheel temperature and the temperature of the band. In general, the band l area and crystallization wheel I area of the cooling water pressure control in 0.1 MPa, other areas of the control in 0.2 MPa or so, can be adjusted according to the actual production situation. The role of the inspiration to recognize the possibility of assembling fan-shaped rolling wheel and important role.

3. Operation

(1) fan-shaped rolling wheel angle adjustment 3 pairs of rolling wheel composed of 8 fan, I if all to the cage axis translation, the combination should be close to a circle. Cable stranding platform, to the fan-shaped core in the fan-shaped rolling wheel in the right position, not overly large extrusion shall prevail. Fan-shaped rolling wheel device should be adjustable angle.

(2) Pre-torque adjustment to make the fan-shaped rolling wheel before and after the fan-shaped core in a natural position, not overly large torque shall prevail.

(3) Normal operation operation in the normal production of cable forming process using fan-shaped rolling wheel, may not be subject to in the payoff reel in the

Fan-shaped core angle in the payoff reel in the shadow of the metaphor, not subject to the length of the lieutenant-shaped core limitations, it does not use the pre-twisting device and does not change the coral-shaped rolling wheel angle can be eliminated turn over. The simplest way to adjust the whole process is: the first orange open dysentery roller, the use of pre-twisting device production; open smooth (only need to produce 2 ~ 3 pitch length) and then according to (1) and (2) the method described in (1) and (2) were adjusted, and fixed fan-shaped roller angle and adjust the pre-twisting, and then you can start the normal high-speed into the production of the cable.

4. Conclusion

(1) This paper describes the method of eliminating the fan-shaped core into the cable turn over is feasible. This has been fully proved for my company's actual production.

(2) The method to meet the fan-shaped core into the cable process design requirements to provide a reliable guarantee, can reduce the operator's labor intensity, and can improve labor productivity.

(3) The method is simple, easy to realize, easy to operate and effective.

(4) This method is also applicable to semi-circular core cable. For the stranding of shaped wires can also be modeled on this method. In special circumstances