▎ 摘　　要

NOVELTY - Economical aluminum substrate photovoltaic welding strip comprises aluminum core (2), outer copper tape (23) and tin layer (24). The outer wall of the aluminum core is sheathed with a copper-clad tape through a coating device, and the outer wall of the copper-clad tape is sprayed with a tin layer through a spray drying device. The preparation of the economical aluminum substrate photovoltaic welding strip comprises (i) adding the aluminum material into the smelting furnace, adding graphene at 700-800 degrees C for mixing, and cooling to room temperature to obtain an aluminum core, preparing graphene; and (ii) passing the aluminum core through the hollow tube, the fixing ring, the spray tube and the heating tube, the rotary handle of the rotation limit device, driving the screw to rotate along the fixed ring, adjusting the limit blocks of each group to move toward the aluminum core, clamping the aluminum core and moving the aluminum core forward along a straight line. USE - Used as economical aluminum substrate photovoltaic welding strip. ADVANTAGE - The strip: performs automatic processing on the photovoltaic welding strip which greatly improves the production efficacy and saves the production and manufacturing cost. DETAILED DESCRIPTION - Economical aluminum substrate photovoltaic welding strip comprises aluminum core (2), outer copper tape (23) and tin layer (24). The outer wall of the aluminum core is sheathed with a copper-clad tape through a coating device, and the outer wall of the copper-clad tape is sprayed with a tin layer through a spray drying device. The preparation of the economical aluminum substrate photovoltaic welding strip comprises (i) adding the aluminum material into the smelting furnace, adding graphene at 700-800 degrees C for mixing, and cooling to room temperature to obtain an aluminum core, adding graphite powder, potassium persulfate and phosphorus pentoxide into concentrated sulfuric acid, and stirring for 4 hours at 80 degrees C to obtain a mixture of A, where controlling the mass ratio of graphite powder, potassium persulfate, phosphorus pentoxide and concentrated sulfuric acid to 3-5:4-5:4-5:11-13, cooling mixture A to room temperature, mixing with deionized water and stir for 10 hours at 0 degrees C to obtain mixture B, filtering the B mixture, washing with deionized water, and drying to obtain C solid, where controlling the mass ratio of A mixture and deionized water to 20-30:1000, dispersing solid C in concentrated sulfuric acid, adding potassium permanganate in five batches, and stirring at 35 degrees C for 2 hours to obtain D slurry, where control the mass ratio of C solid, concentrated sulfuric acid and potassium permanganate to 10-12:340-360:40-50, cooling the D slurry to room temperature, adding deionized water, stirring for 2 hours at 0 degrees C, and adding 30% hydrogen peroxide solution with air bubbles, where controlling the mass ratio of D slurry, deionized water and 30% hydrogen peroxide solution to 390-420:300-320:10-12, generating the bubble, adding it into the centrifuge tube, washing it 5 times with hydrochloric acid with a volume of 10%, centrifuging at 5000 revolutions/minute, centrifuging for 15 minutes, using deionized water to centrifuge for 10 times, centrifuging at 10,000 revolutions/minute and centrifuging for 30 minutes and freeze-drying the washed product to obtain graphene; (ii) passing the aluminum core through the hollow tube, the fixing ring, the spray tube and the heating tube, the rotary handle of the rotation limit device, driving the screw to rotate along the fixed ring, adjusting the limit blocks of each group to move toward the aluminum core, clamping the aluminum core and moving the aluminum core forward along a straight line; (iii) starting the drive motor to drive the active pulley to rotate, driving the driven pulley using the driving pulley to rotate through the belt, so that the hollow tube rotates and the winding wheel also rotates along with it, so that the outer copper tape is evenly sleeved on the aluminum core; and (iv) passing the coated aluminum core into the spray drying device, feeding the tin liquid into the inner cavity of the spraying tube along the feed tube, spraying from the spray hole and spraying on the side wall of the outer copper strip, passing the aluminum core with tin liquid into the heating tube and the electric heating coil heats the aluminum core, so that the tin liquid solidifies on the outer copper strip to form a layer of tin Layer to obtain the semi-finished photovoltaic welding strip, and drawing the semi-finished photovoltaic welding strip to form the base layer DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the economical aluminum substrate photovoltaic welding strip. Aluminum core (2) Outer copper tape (23) Tin layer (24)