Production method of BTTZ fireproof cable

Abstract

The invention discloses a production method of a BTTZ fireproof cable. The method comprises the following steps of shaping a flat copper strip through shaping dies and gradually bending the copper strip into a copper tube; before two sides of the copper tube are close to each other to be closed, firstly fixing a conductive wire core in the middle of the copper tube before filling magnesium oxide,and then automatically filling the magnesium oxide through equipment; closing the copper tube and then welding the copper tube; directly conveying the welded copper tube to a front guide wheel throughguide wheels, wherein the copper tube needs to pass through 10 groups of guide wheels in all, the 10 groups of guide wheels are arranged at 360 degrees and the diameters of each group of guide wheelsare 0.2mm greater than those of the previous group of guide wheels; preliminarily compacting the magnesium oxide to prepare a semi-finished product; and extruding and drawing the semi-finished product through annular equipment to obtain the BTTZ fireproof cable. According to the production method, primary shaping of the cable of which the minimum length is 3,000m according to the size of a take-up reel is achieved, the production cost is reduced, the construction difficulty of a worker is reduced, the characteristics of the fireproof cable are kept and the production efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of cables, in particular to a production method of BTTZ fireproof cables. Background technique [0002] BTTZ fire-resistant cable is a new type of cable composed of a welded copper tube sheath and a middle filled with magnesium oxide crystal powder as an insulating material. The conductor is a new type of single-strand copper rod. It is used in high-rise buildings, airports, docks, underground railways and other places. To ensure the uninterrupted operation of fire-fighting power and important equipment such as fire-fighting water pumps, fire-fighting elevators, local lighting, emergency evacuation instructions, security surveillance, smoke prevention and smoke exhaust systems, and self-provided power supplies in the event of a fire. [0003] As there are more and more high-rise buildings and even super high-rise buildings, the length of cables has also increased accordingly. The fewer the cable connectors, the bet...

AI Technical Summary

Problems solved by technology

[0011] 1. The existing cables have the disadvantage of short length, generally only 70-80 meters;

[0012] 2. During the construction, because the cable length is short and there are many joints, it is easy to be damp;

[0013] 3. In production, magnesium oxide needs to be manually canned into copper pipes, and the production efficiency is low;

[0014] 4. While the output is low, the production process is relatively difficult to control and the cost is high;

[0015] 5. The cable is limited by the production site, and it needs to be drawn in parallel multiple times. The production of 80-meter cables requires a total of more than 300 meters for normal production;

[0016] 6. Because there are many joints in the actual use process, once the joints are not handled properly, the magnesium oxide inside the cable will become a conductive layer after being dampened, resulting in a short circuit of the cable and a potential safety hazard.

[0017] 7. Magnesium oxide needs to be added with gel before production, and then pressed into a block and then dried, and then manually put into the copper tube. If the drying degree is not up to standard, the insulation resistance will not meet the standard and the cable will be unqualified.

Images