The copper strip longitudinally welded continuous produ […]
The copper strip longitudinally welded continuous production line consists of two parts, vertical and horizontal. The vertical part consists of two diagonally barrels and hoppers with magnesium oxide powder on the third floor, a tube forming roll machine, a second floor washing machine, a welding head, and a circulation. Water condensing compressor, pressure roller, No. 1 rolling mill. The horizontal part includes the No. 1 annealing induction annealing box on the first floor, two quenching cooling water tanks, three rolling mills, an annealing induction annealing box No. 2, an outer diameter detector, an eddy current tester and a wire take-up device.
First, the 0.95mm (thickness) * 60.55mm (width) copper strip on the copper tape take-up device (this is only one specification) is put into the copper tape storage device, washed and pickled by the copper tape washer. Drying at a temperature not lower than 35 °C, and then continuously forming a cylindrical shape through the forming wheel of the forming rolling mill. The welding water cooling roller and the copper strip are aligned with each other, and the gap of the slit is about 0.1 mm, and the electrode rod is used. Argon arc welding is performed (no need to fill solder or argon as shielding gas). The welding head is at an angle of 110 degrees to the center of the sheath to preheat the copper strip side. The welding speed of the copper strip is 1.0-3.0 m/min, the welding current is about 205-270A, and the welding voltage is about 12-13V. It is necessary to pay close attention to the surface quality of the copper sheath after welding, and the surface of the copper strip is fish-like, and there are no undesirable phenomena such as leakage welding, holes, and dripping.
Secondly, according to the process requirements, select the appropriate stainless steel core tube and put it from the lower mouth of the magnesium oxide powder hopper to the rolling mill to the No. 1 rolling mill. At this point, the silicone oil conduit is threaded into the core tube. The function of the core tube is to ensure that the insulation thickness between the core and the copper sheath and the core and the core is uniform, and it is fixed to the lower bracket of the magnesium oxide powder hopper, and the "horn" type rubber sleeve and the hopper are used. The powder tube is connected to the powder tube and the upper and lower ports are tightly sealed with a stainless steel tube card. In order to ensure that the conductive core is not eccentric in the copper sheath, the lead is threaded through the sizing die into the core tube, and the lead is soldered to the conductor core. The sizing die should be placed in the mold sleeve at this time. It is fixed on the magnesia powder funnel bracket, and it is required that the sizing die hole is straight with the core core tube nozzle (the diameter of the sizing die diameter is smaller than the diameter of the copper wire core blank by 0.1-0.6mm, mainly the sizing diameter , straightening, removing impurities on the surface of the conductor, etc.).
The lead is then threaded under the seventh pass of the No. 1 rolling mill, at which point the magnesium oxide powder is poured from the funnel into the copper sheath. In order to ensure the smooth filling of the magnesium oxide powder and the compaction of the magnesium oxide powder in the copper sheath, a pair of small hammers are used to strike the copper tube with a certain frequency between the welding torch and the copper tube sizing wheel (frequency is 20-80 times / Minutes or so). The amount of magnesium oxide powder supplied in the funnel can be controlled by the signal of the powder level sensor in the funnel and the inclined cylinder. The funnel and the inclined tube have sensors. Once the magnesium oxide powder is separated from the sensor, an alarm will sound.
The semi-finished product is subjected to continuous rolling and intermediate induction annealing (twice) to obtain the desired finished cable diameter. Each pair of rolling stands is equipped with a plurality of pairs of rolls to insulate and compact the magnesium oxide powder, and at the same time, the diameter of the cable is reduced. After rolling, the cables are passed through intermediate induction annealing (capacity 50-110 kW) and added. The alcohol is circulated in a cooling water tank for quenching.
The entire production line speed is set by the main control station according to the process parameters, and the annealing furnace power can be manually controlled. In the normal production process, it is necessary to continuously carry out intermediate inspections, and check whether the motor speed is overloaded or not.