Production method and production line of parallel flow aluminum flat pipe

Abstract

The invention discloses a production method and a production line of a parallel flow aluminum flat pipe, and belongs to the technical field of aluminum flat pipes. The method comprises an unwinding process, a straightening process, a pre-forming process, a welding process, a chip scraping process, a shaping process and a cutting process. A welding seam straightening process is set between the preforming process and the welding process, a cooling and cleaning process is set between the welding process and the chip scraping process, and a fine adjustment process is set between the shaping process and the cutting process; in the welding seam straightening process, the upper ends of the two arms of the U-shaped structure are straightened firstly, and then the two sides of the upper end of the U-shaped structure are straightened; in the cooling and cleaning process, the aluminum flat pipe sequentially passes through the cooling liquid between the two mounting seats and the cooling liquid in the cooling liquid tank; cooling liquid in the cooling liquid groove flows out to the position between the two mounting bases, and two second sponge bodies are arranged at the rear end of the cooling liquid groove to seal the cooling liquid groove and scrub the two sides of the aluminum flat pipe. In the fine adjustment process, the aluminum flat tube is finely adjusted in the left-right direction and then is finely adjusted in the vertical direction.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum flat tube processing, and particularly relates to a production method and a production line of a parallel flow aluminum flat tube. Background Art

[0002] At present, the condenser and evaporator of automobile air conditioners no longer use the tube-sheet structure made of copper tube and aluminum foil. Almost all cars use aluminum parallel flow condensers and cascade evaporators, which have the advantages of light weight and good heat exchange performance. Parallel flow heat exchangers use porous microchannel flat tubes with a thickness of less than 1.5mm, a wall thickness of less than 0.4mm, and a channel size of about 0.5mm.

[0003] For example, the patent application number CN201510126250.4 discloses a method for manufacturing rust-proof aluminum alloy flat tubes for automobile water tanks and air-conditioning condensers, which is achieved by the following steps: Step 1, prepare raw materials: use rust-proof aluminum alloy LF21 or 3003 aluminum rod with an outer diameter of Φ150mm and a length of 600mm to 900mm.

[0004] Step 2: Turn the aluminum rod skin: Use a lathe to peel the surface of the aluminum rod to remove impurities in the skin.

[0005] Step 3, extrusion: using a horizontal extruder of more than 1350 tons, the aluminum rods are heated to 480-500°C, and are continuously extruded through a die one by one into round billet tubes with an outer diameter of Φ20mm-Φ40mm and a wall thickness of 1.2mm-2.5mm.

[0006] Step 4, cold drawing and diameter reduction: On an inverted disc drawing machine, aluminum alloy outer film oil and inner film oil are injected through outer diameter molds of different specifications and built-in free cores, and circular continuous rotary cold drawing and diameter reduction are performed in 5 to 8 passes at a speed of 200-800 meters per minute to finally obtain a round tube with an outer diameter of Φ5mm~Φ30mm and a wall thickness of 0.25mm~0.5mm.

[0007] Step 5, uncoiling: uncoil the round tube with an outer diameter of Φ5mm to Φ30mm and a wall thickness of 0.25mm to 0.5mm through an automatic uncoiling machine.

[0008] Step 6, initial cleaning: Clean in the cleaning unit and use volatile oil to clean the drawing oil, dust and impurities on the surface of the round tube.

[0009] Step 7, round tube straightening: The cleaned round tube is straightened by two sets of horizontal and vertical straightening wheels on the straightening machine. The size of the straightening wheel can be quickly replaced according to round tubes of different specifications.

[0010] Step 8, flaw detection: Perform non-destructive flaw detection on an eddy current flaw detector.

[0011] Step 9, forming flat tubes: the forming unit presses the flat tubes into various types with a width of 8mm to 40mm, a thickness of 1mm to 4mm, and a wall thickness of 0.25mm to 0.5mm. Products of different specifications can be realized by quickly replacing the rollers of the forming unit.

[0012] Step 10, flat tube straightening: After forming, the flat tube is further straightened on two sets of horizontal and vertical straightening wheels.

[0013] Step 11, secondary cleaning: Clean again through the cleaning unit, and use volatile oil to further clean the remaining grease and impurities on the surface.

[0014] Step 12, shearing: finally, a high-speed flying shear device is used for flying shearing.

[0015] Step 13, packaging: the qualified finished tubes are packaged and shipped out of the factory.

[0016] The process is to first prepare a round tube and then flatten the round tube to obtain a flat tube. This process will cause uneven deformation during the flattening process, resulting in low pressure resistance and irregular shape of the flattened tube. Therefore, in the prior art, aluminum strips are usually bent and extruded and welded to aluminum flat tubes.

[0017] For example, the patent application number CN201110073278.8 discloses a roll-bending manufacturing method for a porous microchannel flat tube, which includes the following steps: first, after unwinding, straightening, and online cleaning, the metal strip is sent to a roller press to press out microgrooves. The roller press is provided with a series of roller pairs, and the metal sheet advances along the roller pairs, and a series of microgrooves are rolled on the metal sheet by the roller pairs; then, the metal sheet enters the sequentially configured multi-pass forming rollers, and the rollers gradually bend the conveyed strip from a straight state into two symmetrical sides in turn; finally, the two symmetrical sides are connected to form the porous microchannel flat tube. The connection method of the two symmetrical sides is to firstly heat them quickly through a high-frequency heating device to reach the welding temperature, and then perform pressure welding. After the two symmetrical sides are connected, the flat tube is further corrected, finished, and inspected.

[0018] The corresponding production line can be found in the following patents: For example, the patent with application number CN201110073278.8 discloses a roll-bending manufacturing equipment for porous microchannel flat tubes, including: a decoiler for releasing the rolled metal sheet; a feeding device for smoothly feeding the metal sheet into the forming section; a feeding device for keeping the fed metal sheet straight to avoid lateral slippage during feeding; an embossing machine for pressing the required micro-groove shape on the fed metal sheet to complete the embossing process; a center bending device for determining the symmetry center of the sheet bending; a roll-bending forming device for gradually bending the straight metal sheet into two symmetrical sides; a connecting device for completing the connection of the two symmetrical sides to form the porous microchannel flat tube.

[0019] For example, the patent with application number CN201710135680.1 discloses a high-frequency welding pipe making machine, which is characterized in that it includes an unwinding unit, a docking unit, a storage unit, a traction unit, a regional dotting unit, a forming unit, a welding unit, a scraping unit, a shaping unit, a cutting unit and a sorting unit arranged in sequence; the unwinding unit includes a protective frame, an aluminum strip roll fixing mechanism, a driving mechanism and a speed control mechanism, the driving mechanism is connected to the aluminum strip roll fixing mechanism, the aluminum strip roll fixing mechanism is arranged in the protective frame, the aluminum strip roll fixing mechanism and the driving mechanism are provided with at least one set, and when there are multiple sets, the axes of the two aluminum strip roll fixing mechanisms are parallel; the speed control mechanism includes a guide plate, a guide wheel I, a guide wheel II and a guide wheel III, the guide plate is arranged on the upper part of the protective frame at the discharge end, the guide wheel I and the guide wheel II are arranged at the discharge end of the guide plate, and the guide wheel III slides up and down below the guide wheel I and the guide wheel II. For example, the patent with application number CN202321947516.8 discloses an aluminum heat pipe production line, which includes: an aluminum strip coil, including a strip aluminum plate and a reel; a machine platform for installing the components required for the aluminum heat pipe production line, wherein the side and the top have wires connecting the components; an unwinding assembly, installed on one side of the top of the machine platform, for fixing the aluminum strip coil and rotating the aluminum strip coil on the top of the unwinding assembly; a rough forming assembly, installed in the middle of the top of the machine platform, for circling the strip aluminum plate of the aluminum strip coil and moving one end of the strip aluminum plate of the aluminum strip coil to a predetermined position; a conveying assembly, installed on the top of the machine platform and on one side of the unwinding assembly, for conveying one end of the strip aluminum plate of the aluminum strip coil to a predetermined position at one end of the rough forming assembly, and the conveying assembly has a traction assembly, The strip aluminum plate of the aluminum strip coil is transferred to the inner side of the rough forming component for processing through the traction component; the welding component is installed at the top of the machine and located at the other end of the rough forming component, and is used to weld the strip aluminum plate of the aluminum strip coil transferred by the rough forming component into a blank aluminum heat sink; the surface treatment component is installed at the top of the machine and located on one side of the welding component, and is used to clean the weld and surface dust of the blank aluminum heat sink; the fine forming component is installed at the top of the machine and located on one side of the surface treatment component, and is used to finely shape the treated aluminum heat sink; the speed detection component is installed at the top of the machine and located on one side of the fine forming component, and is used to detect the moving speed of the aluminum heat sink; the cutting component is installed at the top of the machine and located on one side of the speed detection component, and is used to cut the shaped aluminum heat sink according to the preset length.

[0020] There are two main aspects of quality control for parallel flow aluminum flat tubes: One is the pressure resistance of the parallel flow aluminum flat tube (tested by passing the test liquid into the parallel flow aluminum flat tube); The second is dimensional accuracy. High dimensional accuracy can ensure easy installation and reduce the possibility of leakage.

[0021] This patent provides a production method and production line of parallel flow aluminum flat tubes, which ensures that the parallel flow aluminum flat tubes have high pressure resistance and high dimensional accuracy under high-speed production. Summary of the invention

[0022] The embodiment of the present invention provides a production method and production line of parallel flow aluminum flat tubes, which ensures that the parallel flow aluminum flat tubes have high pressure resistance and high dimensional accuracy under high-speed production (speed greater than 130m / min). The technical solution is as follows: On the one hand, the embodiment of the present invention provides a production method of a parallel flow aluminum flat tube, using the production line of the parallel flow aluminum flat tube of the present patent, the method includes: an unwinding process, a straightening process, a preforming process, a welding process, a scraping process, a shaping process and a cutting process; a weld straightening process is provided between the preforming process and the welding process, a cooling and cleaning process is provided between the welding process and the scraping process, and a fine-tuning process is provided between the shaping process and the cutting process; the preforming process gradually bends the aluminum strip to form a U-shaped structure that matches the shape of the aluminum flat tube 1; the weld straightening process first straightens the upper ends of the two arms of the U-shaped structure, and then straightens the two sides of the upper end of the U-shaped structure; The welding process includes a high-frequency heating process and an extrusion welding process; the cooling and cleaning process is to pass the aluminum flat tube 1 through the coolant between the two mounting seats 33 of the welding device 3 and the coolant in the coolant tank 42 at the front end of the scraping device 4 in sequence; the coolant in the coolant tank 42 flows out from the front end to between the two mounting seats 33, and two second sponges 44 are provided at the rear end to seal it and scrub both sides of the aluminum flat tube 1; the coolant between the two mounting seats 33 flows out from the rear ends of the two mounting seats 33 and the gap between the extrusion wheel 36 and the bearing seat 34; the fine-tuning process first fine-tunes the aluminum flat tube 1 in the left and right directions, and then fine-tunes the aluminum flat tube 1 in the vertical direction.

[0023] Preferably, during the high-frequency heating process, the U-shaped structure is guided by the guide bar 31 and the opening at the top of the U-shaped structure is closed; during the extrusion welding process, the rear part of the extrusion wheel 36 is cooled and cleaned by spraying coolant forward through the cooling metal plate 37 on the inner side of the mounting seat 33; and the cooling of the extrusion wheel shaft 35 and the extrusion wheel 36 is achieved by passing coolant into the extrusion wheel shaft 35.

[0024] Among them, the scraping process includes a scraping process and a high-pressure blowing process. During the scraping process, coolant is sprayed on the scraping area of ​​the scraper 45; the high-pressure blowing process includes successively blowing the aluminum flat tube 1 vertically downward through an outer high-pressure nozzle, blowing the aluminum flat tube 1 vertically downward through an inner high-pressure nozzle, and blowing both sides of the aluminum flat tube 1 through a side high-pressure nozzle, wherein the outer high-pressure nozzle is located outside the sealed chamber 48, and the inner high-pressure nozzle is located inside the sealed chamber 48.

[0025] On the other hand, an embodiment of the present invention further provides a production line for parallel flow aluminum flat tubes, comprising an unwinding device, an aluminum strip straightening device, a preforming device, a weld straightening device 2, a welding device 3, a scraping device 4, a shaping device, a fine-tuning device and a cutting device, which are arranged in sequence from front to back; the unwinding device is used to output the aluminum strip backward; the aluminum strip straightening device is used to straighten the aluminum strip; the preforming device is used to gradually bend the aluminum strip to form a U-shaped structure that matches the shape of the aluminum flat tube 1; the weld straightening device 2 is used to first straighten the upper ends of the two arms of the U-shaped structure, and then straighten the two sides of the upper end of the U-shaped structure; the welding device 3 is used to first perform high-frequency heating on the aluminum flat tube 1, and then perform extrusion welding through two extrusion wheels 36; coolant is passed into the extrusion wheel shaft 35 of the extrusion wheel 36, and the cooling metal plate 37 directly behind the extrusion wheel 36 sprays coolant to the rear of the extrusion wheel 36, and the scraping device 4, the outflowing coolant cools the extrusion wheel 36 and the bearing seat 34; a first sponge 38 is provided between the extrusion wheel 36 and the mounting seat 33 to seal the extrusion wheel 36 and the mounting seat 33 and scrub the extrusion wheel 36; the scraping device 4 is used to scrape the top of the aluminum flat tube 1 flat by a scraper 45; a cooling liquid tank 42 is provided at the feed inlet at the front end of the scraping device 4; the cooling liquid tank 42 contains cooling liquid, and the cooling liquid therein flows from the front end into between the two mounting seats 33, and two second sponges 44 are provided at the rear end thereof to seal and scrub both sides of the aluminum flat tube 1; the cooling liquid between the two mounting seats 33 flows out from the rear end thereof and the gap between the extrusion wheel 36 and the bearing seat 34; the shaping device is used to shape the aluminum flat tube 1; the fine-tuning device is used to fine-tune the left-right and vertical positions of the aluminum flat tube 1; the cutting device is used to cut to obtain products of predetermined length.

[0026] Among them, the weld straightening device 2 in the embodiment of the present invention includes a front flat roller pair 21, a vertical roller pair 22 and a rear flat roller pair 23 arranged in sequence from front to back; the front flat roller pair 21 and the rear flat roller pair 23 are driven synchronously, and both include two straighter flat rollers arranged side by side up and down and respectively located on the upper and lower sides of the aluminum flat tube 1; the straighter flat rollers are arranged in the left and right directions; the vertical roller pair 22 includes two relatively upright rollers arranged side by side left and right and respectively located on the left and right sides of the aluminum flat tube 1, the relatively upright rollers are arranged vertically and the central part thereof is coaxially provided with an arc groove matching the aluminum flat tube 1; a first lower groove is provided on the straighter flat roller at the lower part of the front flat roller pair 21, and two first upper grooves are provided side by side left and right on the straighter flat roller at the upper part; a second lower groove is provided on the straighter flat roller at the lower part of the rear flat roller pair 23, and a second Upper groove; the first lower groove, the first upper groove, the second lower groove and the second upper groove are coaxially arranged with the corresponding straighter flat rollers; the first lower groove and the second lower groove are both U-shaped grooves matched with the lower part of the aluminum flat tube 1, and their width is equal to the width of the aluminum flat tube 1; the two first upper grooves are respectively matched with the upper ends of the two arms of the aluminum flat tube 1, which are annular slits, and their width is the same as the thickness of the aluminum strip; the upper ends of the two arms of the aluminum flat tube 1 are respectively slidably arranged in the two first upper grooves, and their lower parts are slidably arranged in the first lower groove; the second upper groove is matched with the upper part of the aluminum flat tube 1, and its left and right sides are respectively located on the outer sides of the corresponding sides of the upper ends of the two arms of the aluminum flat tube 1, which are annular slits, and their width is the same as the thickness of the aluminum flat tube 1; the upper part of the aluminum flat tube 1 is slidably arranged in the second upper groove, and the lower part is slidably arranged in the second lower groove.

[0027] Among them, the scraper device 4 in the embodiment of the present invention includes a shell 41 arranged in the front-to-back direction, a cooling liquid groove 42 on the front side of the shell 41, a feeding channel 43 on the front side of the shell 41, two second sponges 44 on the left and right sides of the rear end of the feeding channel 43, a scraper 45 in the shell 41 and located at the top of the aluminum flat tube 1, a supporting chute 46 in the shell 41 and located directly below the scraper 45, a cooling liquid nozzle 47 in the shell 41 and located next to the scraper 45, a discharge channel 49 on the inner rear side of the shell 41, a sealing chamber 48 at the front end of the discharge channel 49, an external high-pressure nozzle between the scraper 45 and the sealing chamber 48, an internal high-pressure nozzle in the sealing chamber 48, and two groups of side high-pressure nozzles on the left and right sides of the discharge channel 49, the supporting chute 46 is arranged in the front-to-back direction and is located at the lower part of the aluminum flat tube 1, the cooling liquid nozzle 47 faces the scraping part of the top of the aluminum flat tube 1 and is connected to the cooling liquid circulation structure through a pipeline; the two groups of side high-pressure nozzles are respectively They are respectively located on the left and right sides of the aluminum flat tube 1, and the outer high-pressure nozzle and the inner high-pressure nozzle are both located directly above the aluminum flat tube 1. The side high-pressure nozzle, the outer high-pressure nozzle and the inner high-pressure nozzle are all connected to the compressed air supply structure through pipelines and are all arranged toward the aluminum flat tube 1; an opening is provided on the upper side of the front end of the coolant tank 42 for the aluminum flat tube 1 to pass through, and its front end is located adjacent to the rear of the welding device 3, and it is connected to the coolant circulation structure through a pipeline, and its rear end is connected to the front end of the feed channel 43; the aluminum flat tube 1 is immersed in the coolant in the coolant tank 42; two second sponges 44 are arranged side by side and tightly together, and are respectively located on the left and right sides of the aluminum flat tube 1, which seal the rear end of the feed channel 43; the front side of the sealing chamber 48 is provided with a strip hole for the aluminum flat tube 1 to pass through, and the lower side is provided with a chip removal port; the coolant circulation structure is used to collect the coolant output by the scraping device 4 and the welding device 3 and cool and filter it.

[0028] Among them, the welding device 3 in the embodiment of the present invention includes a guide bar 31, a high-frequency coil 32 and an extrusion wheel assembly arranged in sequence from front to back; the high-frequency coil 32 is arranged in the front-to-back direction, and is located in the adjacent front of the extrusion wheel assembly, and is sleeved outside the aluminum flat tube 1; the guide bar 31 is arranged in the front-to-back direction, and its rear end extends into the high-frequency coil 32, and is located between the upper ends of the two arms of the aluminum flat tube 1; the extrusion wheel assembly includes two welding units arranged side by side on the left and right, and the welding unit includes a mounting seat 33, a bearing seat 34 at the inner end of the front side of the mounting seat 33, an extrusion wheel shaft 35 arranged vertically on the upper side of the bearing seat 34, an extrusion wheel 36 coaxially arranged on the extrusion wheel shaft 35, a cooling metal plate 37 arranged on the inner side of the mounting seat 33 and along the front-to-back direction, and a first sponge 38 between the front end of the mounting seat 33 and the extrusion wheel 36, the two mounting seats 33 are arranged side by side on the left and right, and the two extrusion wheels 3 6 are respectively located on the left and right sides of the aluminum flat tube 1, and a coolant channel is coaxially arranged in the extrusion wheel shaft 35, and the upper end of the coolant channel is connected to the coolant circulation structure through a pipeline; two cooling metal plates 37 are respectively located on the left and right sides of the aluminum flat tube 1, and are respectively located directly behind the two extrusion wheels 36; a cooling cavity is arranged in the cooling metal plate 37, and a plurality of spray holes are arranged side by side up and down on the front side, and the rear end of the top is connected to the coolant circulation structure through a pipeline; the spray holes are arranged toward the rear of the corresponding extrusion wheel 36; the coolant flowing out of the front end of the coolant tank 42 flows between the two mounting seats 33, and the coolant flows out from the gap between the rear ends of the two mounting seats 33 and between the extrusion wheel 36 and the bearing seat 34, and the aluminum flat tube 1 is fully or partially immersed in the coolant between the two mounting seats 33; the first sponge 38 is used to seal the extrusion wheel 36 and the mounting seat 33.

[0029] Among them, the fine-tuning device in the embodiment of the present invention includes a left-right fine-tuning structure, an eddy current flaw detection structure, a length measuring structure and a vertical fine-tuning structure which are arranged in sequence from front to back; the left-right fine-tuning structure includes two horizontal fine-tuning units which are arranged side by side and located on the left and right sides of the aluminum flat tube 1 respectively, and the horizontal fine-tuning unit includes a first adjustment seat arranged along the front-to-back direction and two fine-tuning vertical rollers arranged side by side on its inner side; the fine-tuning vertical roller is arranged vertically, and it rests on the corresponding side of the aluminum flat tube 1, and its roller surface is smooth, and it can be arranged on the first adjustment seat for left-right fine-tuning; a total of four fine-tuning vertical rollers on the left and right sides are arranged staggered front and back; the vertical fine-tuning structure includes a first adjustment seat arranged along the front-to-back direction, and a first adjustment seat arranged along the front-to-back direction. A rearwardly arranged second adjustment seat and a plurality of pairs of vertical fine-tuning wheel pairs arranged front and back on it; the vertical fine-tuning wheel pairs include two fine-tuning disks arranged side by side up and down and driven synchronously; the two fine-tuning disks are respectively located on the upper and lower sides of the aluminum flat tube 1, which are pressed against each other, and coaxially provided with grooves on the circumference thereof that match half of the aluminum flat tube 1; the upper and lower parts of the aluminum flat tube 1 are respectively located in the grooves of the two fine-tuning disks; the fine-tuning disks are arranged in the left and right directions, and are arranged on the slider; a plurality of strip openings are arranged front and back on the second adjustment seat, and the strip openings are arranged vertically; the two sliders of the same vertical fine-tuning wheel pair are slidably arranged in the same strip opening and can be vertically fine-tuned.

[0030] Among them, the shaping device in the embodiment of the present invention includes M vertical roller shaping wheel pairs and N flat roller shaping wheel pairs, M and N are integers greater than or equal to 2, MN≥2; the vertical roller shaping wheel pairs and the flat roller shaping wheel pairs are arranged alternately, and the vertical roller shaping wheel pairs include two shaping vertical rollers arranged side by side on the left and right and respectively located on the left and right sides of the aluminum flat tube 1; the shaping vertical rollers are arranged vertically, and the cleaning sponges are tightly attached to the outer sides thereof; the flat roller shaping wheel pairs include two shaping flat rollers arranged side by side up and down and respectively located on the upper and lower sides of the aluminum flat tube 1; the shaping flat rollers are arranged in the left and right directions; arc grooves are coaxially provided on the roller surfaces of the shaping vertical rollers of the front vertical roller shaping wheel pair, no grooves are provided on the roller surfaces of the shaping vertical rollers of the middle vertical roller shaping wheel pair, and rectangular grooves are coaxially provided on the roller surfaces of the shaping vertical rollers of the rear vertical roller shaping wheel pair; the cutting device is a flying shear cutting device.

[0031] Furthermore, the high-frequency coil 32 in the embodiment of the present invention is arranged on the adjustment arm and can be adjusted vertically and left-right; the guide bar 31 can be adjusted front-to-back and vertically; the mounting seat 33 can be adjusted left-to-right; the scraper 45 can be adjusted left-to-right and vertically; the supporting slide groove 46 can be adjusted vertically; the shaping vertical roller can be adjusted left-to-right; and the shaping flat roller can be adjusted vertically. The technical solution provided by the embodiment of the present invention has the following beneficial effects: (1) The weld straightening device realizes the shaping and straightening of the upper ends of the two arms of the aluminum flat tube to ensure the subsequent welding effect.

[0032] (2) The guide assembly has three functions: one is to guide, the second is to prevent deformation during heating (especially inward), and the third is to seal the upper end of the aluminum flat tube to prevent impurities and coolant from entering.

[0033] (3) The coolant flowing out between the extrusion wheel and the bearing seat realizes the cooling of the bearing seat and the extrusion wheel.

[0034] (4) The cooling metal plate realizes the cooling of the coolant and the aluminum flat tube between the two mounting seats, and the sprayed coolant realizes the cooling and cleaning of the extrusion wheel. The first sponge has two functions, one is to realize sealing, and the other is to realize the scrubbing of the extrusion wheel.

[0035] (5) The coolant in the coolant tank and the two mounting seats realizes the cooling and cleaning of the aluminum flat tube and the extrusion wheel to facilitate scraping and can reduce the temperature of the aluminum flat tube to below 50°C.

[0036] (6) The second sponge has multiple functions: one is to seal the rear end of the feed channel, the second is to scrub the aluminum flat tube, and the third is to absorb the coolant on the aluminum flat tube.

[0037] (7) The side high-pressure nozzle, the external high-pressure nozzle and the internal high-pressure nozzle realize the drying and cleaning of the aluminum flat tube. The sealed chamber is isolated to ensure the cleaning effect; and the temperature of the aluminum flat tube is further reduced to below 35°C to facilitate subsequent molding processing.

[0038] (8) According to customer feedback, for aluminum flat tubes, high accuracy and length precision are required on both sides; the special design of the vertical roller shaping wheel set (more vertical rollers, different structures of vertical rollers in different positions, and the setting of cleaning sponges, etc.) is used to ensure the accuracy on both sides. The length precision is ensured by setting the fine-tuning device, and the fine-tuning of the vertical position also avoids the aluminum flat tube from shaking up and down when cutting, further ensuring the precision.

[0039] (9) The processing speed of the aluminum flat tube of the present invention is greater than 130m / min (usually greater than 150m / min). Compared with the prior art, the compressive strength of the aluminum flat tube is increased by at least 15%; specifically, the welding dimension error of the aluminum flat tube is less than 0.02mm, the scraping dimension error is less than 0.02mm, the thickness error is less than 0.01mm, and the cutting error is less than 0.1mm. Fig. 9 As shown, the top of the aluminum flat tube is flat and smooth, with no visible welding marks at all. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a principle block diagram of a production line of parallel flow aluminum flat tubes in an embodiment of the present invention; Figure 2 It is a structural schematic diagram of the combination of a weld straightening device and a welding device; Figure 3 It is a schematic diagram of the structure of the upper flat roller of the front flat roller pair; Figure 4 It is a structural diagram of the vertical roller; Figure 5 It is a schematic diagram of the structure of the upper flat roller of the rear flat roller pair; Figure 6 is a schematic diagram of the structure of the scraper device; Figure 7 It is a structural schematic diagram of the left-right fine-tuning structure; Figure 8 It is a structural schematic diagram of the vertical fine-tuning structure; Fig. 9 This is a schematic diagram of the appearance of the welding end of the aluminum flat tube prepared by this patent.

[0041] In the figure: 1 aluminum flat tube, 2 welding seam straightening device, 3 welding device, 4 scraping device; 21 front flat roller pair, 22 vertical roller pair, 23 rear flat roller pair; 31 guide assembly, 32 high frequency coil, 33 mounting seat, 34 bearing seat, 35 extrusion wheel shaft, 36 extrusion wheel, 37 cooling metal plate, 38 first sponge body; 41 shell, 42 cooling liquid tank, 43 feeding channel, 44 second sponge body, 45 scraper, 46 supporting slide groove, 47 cooling liquid nozzle, 48 sealing chamber, 49 discharging channel. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] Example 1 See also Figure 1-8 Embodiment 1 provides a parallel flow aluminum flat tube production line, including an unwinding device, an aluminum strip straightening device, a preforming device, a weld straightening device 2, a welding device 3, a scraping device 4, a shaping device, a fine-tuning device and a cutting device, which are arranged in sequence from front to back.

[0044] Among them, the unwinding device is used to output the aluminum strip backwards, which is consistent with the conventional technology.

[0045] Among them, the aluminum strip straightening device is used to straighten the aluminum strip, which is consistent with conventional technology.

[0046] The preforming device is used to gradually bend the aluminum strip into a U-shaped structure that matches the shape of the aluminum flat tube 1, which is consistent with conventional technology.

[0047] The weld straightening device 2 is used to first straighten the upper ends of the two arms of the U-shaped structure, and then straighten the two sides of the upper end of the U-shaped structure.

[0048] The welding device 3 is used to first perform high-frequency heating on the aluminum flat tube 1, and then perform extrusion welding through two extrusion wheels 36. Cooling liquid is introduced into the extrusion wheel shaft 35 of the extrusion wheel 36 to cool the extrusion wheel shaft 35 and the extrusion wheel 36. The cooling metal plate 37 directly behind the extrusion wheel 36 sprays cooling liquid to the rear of the extrusion wheel 36 to cool and clean the extrusion wheel 36. The cooling liquid flowing out of the scraper device 4 cools the extrusion wheel 36 and the bearing seat 34. A first sponge 38 is provided between the extrusion wheel 36 and the mounting seat 33 to seal the extrusion wheel 36 and the mounting seat 33 and to scrub the extrusion wheel 36 and absorb the cooling liquid.

[0049] The scraper device 4 is used to scrape the top of the aluminum flat tube 1 flat by a scraper 45. A coolant tank 42 is provided at the feed port at the front end of the scraper device 4. The coolant tank 42 contains coolant, which flows from the front end into between the two mounting seats 33. Two second sponges 44 are provided at the rear end for sealing and scrubbing the two sides of the aluminum flat tube 1, which are used to cool and clean the aluminum flat tube 1. The coolant between the two mounting seats 33 flows out from the rear end thereof and the gap between the extrusion wheel 36 and the bearing seat 34.

[0050] The shaping device is used to shape the aluminum flat tube 1 .

[0051] The fine-tuning device is used to fine-tune the left-right and vertical positions of the aluminum flat tube 1 to ensure the cutting accuracy.

[0052] The cutting device is used to cut the product to a predetermined length, which is consistent with the prior art. Specifically, the cutting device can be a flying shear cutting device.

[0053] Example 2 Example 2 provides a production line for parallel flow aluminum flat tubes, the structure of which is basically the same as that of Example 1, except that: See also Figure 2-5 The weld straightening device 2 in the embodiment of the present invention includes a front flat roller pair 21, a vertical roller pair 22, and a rear flat roller pair 23, which are arranged in sequence from front to back. The front flat roller pair 21 and the rear flat roller pair 23 are synchronously driven (specifically, they can be driven by two synchronously driven universal shafts), and they both include two straightening flat rollers arranged side by side and located on the upper and lower sides of the aluminum flat tube 1 respectively. The straightening flat rollers are arranged in the left and right directions. The vertical roller pair 22 includes two vertical rollers arranged side by side and located on the left and right sides of the aluminum flat tube 1 respectively. The vertical rollers are arranged vertically and the central part thereof is coaxially provided with an arc groove that matches the aluminum flat tube 1.

[0054] Among them, a first lower groove is provided on the straighter flat roller at the bottom of the front flat roller pair 21, and two first upper grooves are provided side by side on the straighter flat roller at the top (the first lower groove is symmetrically arranged). A second lower groove is provided on the straighter flat roller at the bottom of the rear flat roller pair 23, and a second upper groove is provided on the straighter flat roller at the top (located directly above the second lower groove). The first lower groove, the first upper groove, the second lower groove and the second upper groove are coaxially arranged with the corresponding straighter flat roller. The first lower groove and the second lower groove are both U-shaped grooves that match the lower part of the aluminum flat tube 1, and their width is equal to the width of the aluminum flat tube 1 (there is a small gap between them for easy sliding). The two first upper grooves are respectively matched with the upper ends of the two arms of the aluminum flat tube 1, which are annular slits, and their width is the same as the thickness of the aluminum strip (there is a small gap between them for easy sliding). The upper ends of the two arms of the aluminum flat tube 1 are respectively slidably arranged in the two first upper grooves, and the lower part is slidably arranged in the first lower groove. The second upper groove is matched with the upper part of the aluminum flat tube 1, and its left and right sides are respectively located on the outer sides of the corresponding sides of the upper ends of the two arms of the aluminum flat tube 1. It is an annular slit, and its width is the same as the thickness of the aluminum flat tube 1 (with a small gap between them for easy sliding). The upper part of the aluminum flat tube 1 is slidably arranged in the second upper groove, and the lower part is slidably arranged in the second lower groove.

[0055] Among them, see Figure 2 The welding device 3 in the embodiment of the present invention includes a guide bar 31, a high-frequency coil 32, and an extrusion wheel assembly, etc., which are arranged in sequence from front to back. The high-frequency coil 32 is arranged in the front-to-back direction, and is located in the adjacent front of the extrusion wheel assembly. It is sleeved outside the aluminum flat tube 1 and is arranged on a corresponding bracket. The guide bar 31 is arranged in the front-to-back direction, and most of it is located in front of the high-frequency coil 32, and its rear end extends into the high-frequency coil 32. It is located between the upper ends of the two arms of the aluminum flat tube 1, and its vertical height is 2-5mm. It is arranged on a corresponding bracket.

[0056] Among them, the extrusion wheel assembly includes two welding units arranged side by side on the left and right sides, and the two welding units are respectively located on the left and right sides of the aluminum flat tube 1. The connection unit includes a mounting seat 33, a bearing seat 34, an extrusion wheel shaft 35, an extrusion wheel 36, a cooling metal plate 37 and a first sponge 38. Among them, the two mounting seats 33 are arranged side by side on the left and right sides, which are specifically rectangular blocks arranged in the front and rear directions, and are respectively located on the left and right sides of the aluminum flat tube 1. The two bearing seats 34 are arranged side by side on the left and right sides. The bearing seat 34 is arranged at the lower part of the inner end of the front side of the corresponding mounting seat 33. It is a rectangular box structure arranged in the front and rear directions. Its inner side is flush with the inner side of the mounting seat 33 on the corresponding side, and it is connected to the lubricating oil supply structure through a pipeline. The extrusion wheel shaft 35 is vertically arranged on the upper side of the bearing seat 34, and it is rotatably arranged on the bearing seat 34. A coolant channel (through the extrusion wheel shaft 35) is coaxially arranged inside it, and its upper end is connected to the coolant circulation structure through a bamboo tube, and its lower end passes through the bearing seat 34 downward and is open. Two extrusion wheels 36 are arranged side by side and are respectively located on the left and right sides of the aluminum flat tube 1. The extrusion wheel 36 is coaxially arranged at the lower part of the extrusion wheel shaft 35, which is located adjacent to the upper part of the bearing seat 34, and an arc groove is provided on its circumference to cooperate with the aluminum flat tube 1. Two cooling metal plates 37 are respectively located on the left and right sides of the aluminum flat tube 1, which are respectively arranged on the inner sides of the two mounting seats 33. They are both arranged in the front-to-back direction, and there is a gap between them and the corresponding sides of the aluminum flat tube 1. They are respectively located directly behind the two extrusion wheels 36. A cooling cavity is provided in the cooling metal plate 37, and a plurality of spray holes are arranged side by side up and down on the front side thereof. The rear end of the top thereof is connected to the coolant circulation structure through a pipeline (specifically a bamboo tube), which is arranged at the inner front part of the corresponding mounting seat 33, and is a rectangular copper plate. The spray hole is arranged toward the rear side of the corresponding extrusion wheel 36 and is connected to the cooling cavity. The two first sponges 38 are respectively located on the left and right sides of the aluminum flat tube 1, and are located on the outside of the cooling metal plate 37 on the corresponding side, and are located between the outside of the rear part of the extrusion wheel 36 on the corresponding side and the mounting seat 33 to seal the extrusion wheel 36 and the mounting seat 33. The first sponge 38 is a vertically arranged sponge strip, which is located in front of the corresponding cooling metal plate 37, fixed to the inner front end of the corresponding mounting seat 33, and its lower end is fixed to the bearing seat 34, and is used to seal the extrusion wheel 36 and the mounting seat 33 and wipe the extrusion wheel 36. The coolant flowing out of the front end (specifically the opening) of the coolant tank 42 of the scraper device 4 flows between the two mounting seats 33, and the coolant flows out from the gap between the rear ends of the two mounting seats 33 and between the extrusion wheel 36 and the bearing seat 34 (used to achieve cooling of the lower part of the extrusion wheel 36 and the bearing seat 34), and the aluminum flat tube 1 is fully or partially immersed in the coolant between the two mounting seats 33. Specifically, the mounting seat 33, the extrusion wheel 36 and the first sponge body 38 form a U-shaped structure that is open backwards.

[0057] Among them, see Figure 6The scraper device 4 in the embodiment of the present invention includes a shell 41, a coolant tank 42, a feed channel 43, two second sponges 44, a scraper 45, a support structure 46, a coolant nozzle 47, a sealing chamber 48, a discharge channel 49, an external high-pressure nozzle, multiple internal high-pressure nozzles and two groups of side high-pressure nozzles. The shell 41 is arranged along the front-to-back direction, and is specifically a rectangular box structure. Both the front and rear sides of the shell are provided with through holes for the aluminum flat tube 1 to pass through, and the through holes are located above the coolant circulation structure. The feed channel 43 is arranged on the inner front side of the shell 41. It is arranged at the through hole on the front side of the shell 41, and can allow the aluminum flat tube 1 to pass through. It is specifically a rectangular tube arranged along the front-to-back direction. The cooling liquid tank 42 is arranged on the outer front side of the shell 41, and is arranged in the front-to-back direction. An opening (specifically a vertically arranged U-shaped opening, from which the cooling liquid flows out) is arranged on the upper side of the front end for the aluminum flat tube 1 to pass through. The cooling liquid is contained therein, and the front end thereof is connected to the adjacent rear of the mounting seat 33 through a pipeline with a cooling liquid circulation structure (which outputs cooling liquid to the cooling liquid tank 42), and the rear end thereof is connected to the front end of the feed channel 43. Specifically, the cooling liquid tank 42 is a rectangular tank arranged in the front-to-back direction, and its left and right sides and the bottom are flush with the corresponding sides of the feed channel 43, and its left or right side is connected to the cooling liquid circulation structure through a pipeline. The aluminum flat tube 1 is immersed in the cooling liquid in the cooling liquid tank 42. The two second sponges 44 are respectively arranged on the left and right sides of the rear end of the feed channel 43, and are arranged side by side and close together. They are respectively located on the left and right sides of the aluminum flat tube 1, and seal the rear end of the feed channel 43. They are specifically vertically arranged sponge strips, and their outer sides are fixed on the corresponding sides of the feed channel 43, and their upper and lower ends are respectively fixed on the upper and lower sides of the feed channel 43. The scraper 45 is located in the front part of the shell 41, and is located at the top of the aluminum flat tube 1. It is arranged obliquely forward from top to bottom. The support slide 46 is located in the front part of the shell 41, and is located directly below the scraper 45. It is arranged in the front-to-back direction and is located at the lower part of the aluminum flat tube 1. It is specifically a plastic rectangular groove (the aluminum flat tube 1 is slidably arranged in the rectangular groove). The coolant nozzle 47 is located in the front part of the shell 41, and is located next to the scraper 45. It faces the scraped part on the top of the aluminum flat tube 1, and is connected to the coolant circulation structure through a pipeline. The discharge channel 49 is arranged at the rear side of the shell 41. It is arranged at the through hole at the rear side of the shell 41. It can allow the aluminum flat tube 1 to pass through. It is specifically a rectangular tube arranged in the front-to-back direction. Its lower side is arranged obliquely downward from the back to the front to allow the blown-off debris and coolant to flow into the shell 41. The sealed chamber 48 is located at the rear of the shell 41. It is arranged at the front end of the discharge channel 49. Its front side is provided with a strip hole (specifically a vertically arranged oblong hole, slightly larger than the aluminum flat tube 1) for the aluminum flat tube 1 to pass through, and its lower side is provided with a chip discharge port, which is specifically a rectangular chamber arranged in the front-to-back direction. The chip discharge port is a rectangular port arranged in the front-to-back direction and a rectangular discharge pipe is arranged on it in the vertical direction to reduce the possibility of debris splashing into the sealed chamber 48.

[0058] Among them, the coolant circulation structure is used to collect, cool and filter the coolant output by the scraping device 4 and the welding device 3. It can be arranged below the shell 41, and it delivers the coolant to the extrusion wheel shaft 35, the cooling metal plate 37, the coolant tank 42 and the coolant nozzle 47 through a pump.

[0059] At the welding device 3 and the scraping device 4, the aluminum flat tube 1 passes through the guide bar 31, the high-frequency coil 32, the extrusion wheel 36, the cooling metal plate 37, the rear part of the mounting seat 33, the cooling liquid tank 42, the feed channel 43, the support slide 46, directly below the external high-pressure nozzle, the sealing chamber 48 and the discharge channel 49 from front to back.

[0060] Among them, the shaping device in the embodiment of the present invention includes M vertical roller shaping wheel pairs and N flat roller shaping wheel pairs, M and N are integers greater than or equal to 2, MN≥2. Specifically, M is 6, and N is 3. The vertical roller shaping wheel pairs and the flat roller shaping wheel pairs are arranged alternately, and one or more vertical roller shaping wheel pairs are arranged between two adjacent flat roller shaping wheel pairs. The M vertical roller shaping wheel pairs and the N flat roller shaping wheel pairs are arranged in sequence from front to back. The vertical roller shaping wheel pair includes two shaping vertical rollers that are arranged side by side on the left and right and are respectively located on the left and right sides of the aluminum flat tube 1. The shaping vertical roller is arranged vertically, and a cleaning sponge is tightly attached to its outer side (vertically arranged, arranged on the corresponding bracket, which is used to wipe the shaping vertical roller). The setting of the cleaning sponge can ensure the cleanliness of the shaping vertical roller, and thus ensure the accuracy of shaping. The flat roller shaping wheel pair includes two shaping flat rollers that are arranged side by side up and down and are respectively located on the upper and lower sides of the aluminum flat tube 1. The two shaping flat rollers are synchronously driven (specifically through two synchronously driven universal shafts) and are arranged in the left and right directions. The shaping vertical rollers of the front (such as the two front rollers) shaping wheel set have arc grooves coaxially arranged on their roller surfaces, the shaping vertical rollers of the middle (such as the three front rollers) shaping wheel set have no grooves on their roller surfaces, and the shaping vertical rollers of the rear (such as the rear roller) shaping wheel set have rectangular grooves coaxially arranged on their roller surfaces.

[0061] Among them, see Figure 7-8The fine-tuning device in the embodiment of the present invention includes a left-right fine-tuning structure, an eddy current flaw detection structure, a length-counting structure, and a vertical fine-tuning structure, etc., which are arranged in sequence from front to back. The eddy current flaw detection structure and the length-counting structure are consistent with the prior art. Among them, the left-right fine-tuning structure includes two horizontal fine-tuning units arranged side by side and located on the left and right sides of the aluminum flat tube 1, respectively. The horizontal fine-tuning unit includes a first adjustment seat arranged along the front-to-back direction and two fine-tuning vertical rollers arranged side by side on its inner side. The first adjustment seat is specifically a rectangular plate arranged along the front-to-back direction. The fine-tuning vertical roller is arranged vertically, and it rests on the corresponding side (left or right) of the aluminum flat tube 1. The roller surface is smooth, and it can be fine-tuned left and right (the minimum distance of fine-tuning is 0.01mm) on the first adjustment seat. A total of four fine-tuning vertical rollers on the left and right sides are arranged in an interlaced manner front and back. The vertical fine-tuning structure includes a second adjustment seat arranged along the front-to-back direction and a plurality of pairs of vertical fine-tuning wheels arranged side by side front and back on it. The second adjustment seat is specifically a rectangular plate arranged vertically. The vertical fine-tuning wheel set includes two fine-tuning disks that are arranged side by side and driven synchronously. The two fine-tuning disks are respectively located on the upper and lower sides of the aluminum flat tube 1, and they are pressed against each other. A groove that matches half of the aluminum flat tube 1 is coaxially arranged on the circumference thereof (the width is equal to the thickness of the aluminum flat tube 1, and the depth is half of the width of the aluminum flat tube 1). The upper and lower parts of the aluminum flat tube 1 are respectively located in the grooves of the two fine-tuning disks. The fine-tuning disks are arranged in the left and right directions, and they are arranged on a slider (specifically a rectangular block). A plurality of strip openings are arranged side by side front and back on the second adjustment seat, and the strip openings are arranged vertically; the two sliders of the same vertical fine-tuning wheel set are slidably arranged in the same strip opening and can be fine-tuned vertically (the minimum distance of fine-tuning is 0.01mm).

[0062] Example 3 Embodiment 3 provides a production line for parallel flow aluminum flat tubes, and its structure is basically the same as that of Embodiment 2, except that: in order to produce products of various specifications, various structures are adjustable and replaceable. The high-frequency coil 32 in the embodiment of the present invention is arranged on the adjustment arm and can be adjusted vertically and left-right. The guide bar 31 can be adjusted forward and backward and vertically. The mounting seat 33 can be adjusted left-right. The scraper 45 can be adjusted left-right and vertically. The support chute 46 can be adjusted vertically. The shaping vertical roller can be adjusted left-right. The shaping flat roller can be adjusted vertically.

[0063] Example 4 See also Figure 1-8 Embodiment 4 provides a method for producing a parallel flow aluminum flat tube, using the production line of the parallel flow aluminum flat tube disclosed in Embodiment 1 or 2, the method sequentially comprises: an unwinding process, a straightening process, a preforming process, a weld straightening process, a welding process, a cooling and cleaning process, a scraping process, a shaping process, a fine-tuning process and a cutting process. The unwinding process, the straightening process, the preforming process, the welding process, the scraping process, the shaping process and the cutting process are similar to those in the prior art.

[0064] In the preforming process, the aluminum strip is gradually bent into a U-shaped structure that matches the shape of the aluminum flat tube 1 .

[0065] Among them, the weld straightening process first straightens the upper ends of the two arms of the U-shaped structure, and then straightens the two sides of the upper end of the U-shaped structure to ensure the accuracy of the welding process.

[0066] The welding process includes a high-frequency heating process and an extrusion welding process. In the high-frequency heating process, the U-shaped structure is guided by the guide bar 31 and the opening at the top of the U-shaped structure is closed. In the extrusion welding process, the cooling metal plate 37 inside the mounting seat 33 sprays coolant forward to cool and clean the rear of the extrusion wheel 36. The extrusion wheel shaft 35 and the extrusion wheel 36 are cooled by passing the coolant into the extrusion wheel shaft 35.

[0067] The cooling and cleaning process is to sequentially pass the aluminum flat tube 1 through the coolant between the two mounting seats 33 of the welding device 3 and the coolant in the coolant tank 42 at the front end of the scraping device 4. The coolant in the coolant tank 42 flows out from the front end to between the two mounting seats 33, and two second sponges 44 are provided at the rear end to seal it and scrub and dry both sides of the aluminum flat tube 1. The coolant between the two mounting seats 33 flows out from the rear ends of the two mounting seats 33 and the gap between the extrusion wheel 36 and the bearing seat 34. The cooling and cleaning process is used to ensure the accuracy of the scraping process. The cooling and cleaning process is implemented on the welding device 3 and the scraping device 4.

[0068] Among them, the scraping process includes a scraping process and a high-pressure blowing process. In the scraping process, coolant is sprayed on the scraping area of ​​the scraper 45; the high-pressure blowing process includes successively blowing the aluminum flat tube 1 vertically downward through an outer high-pressure nozzle, blowing the aluminum flat tube 1 vertically downward through an inner high-pressure nozzle, and blowing both sides of the aluminum flat tube 1 through a side high-pressure nozzle. The outer high-pressure nozzle is located outside the sealing chamber 48, and the inner high-pressure nozzle is located inside the sealing chamber 48 to reduce interference.

[0069] The fine-tuning process first fine-tunes the aluminum flat tube 1 in the left-right direction, and then fine-tunes the aluminum flat tube 1 in the vertical direction to ensure the accuracy of the cutting process.

[0070] The results of the aluminum flat tube (made of 3003 aluminum alloy and 1069.6 mm in length) prepared by this patented method are as follows: Table 1

[0071] For the same specifications of commercial products, the pressure resistance of product 1 is about 5Mpa, and the pressure resistance of product 2 is 11-12Mpa. The pressure resistance improvement effect is obvious.

[0072] Among them, "first" and "second" in this patent only serve to distinguish and have no other special meanings.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for producing a parallel flow aluminum flat tube, the method comprising: Unwinding process, straightening process, preforming process, welding process, scraping process, shaping process and cutting process; characterized in that, A weld straightening process is set between the preforming process and the welding process, a cooling and cleaning process is set between the welding process and the scraping process, and a fine-tuning process is set between the shaping process and the cutting process; The preforming step gradually bends the aluminum strip to form a U-shaped structure that matches the shape of the aluminum flat tube (1); the weld straightening step first straightens the upper ends of the two arms of the U-shaped structure, and then straightens the two sides of the upper end of the U-shaped structure; The welding process includes a high-frequency heating process and an extrusion welding process; the cooling and cleaning process is to sequentially pass the aluminum flat tube (1) through the coolant between the two mounting seats (33) of the welding device (3) and the coolant in the coolant tank (42) at the front end of the scraping device (4); the coolant in the coolant tank (42) flows out from the front end to between the two mounting seats (33), and two second sponges (44) are provided at the rear end to seal it and scrub the two sides of the aluminum flat tube (1); the coolant between the two mounting seats (33) flows out from the rear ends of the two mounting seats (33) and the gap between the extrusion wheel (36) and the bearing seat (34); The fine-tuning process first fine-tunes the aluminum flat tube (1) in the left-right direction, and then fine-tunes the aluminum flat tube (1) in the vertical direction.

2. The method according to claim 1, characterized in that During the high-frequency heating process, the U-shaped structure is guided by the guide strip (31) and the opening at the top of the U-shaped structure is closed; during the extrusion welding process, the rear part of the extrusion wheel (36) is cooled and cleaned by spraying coolant forward through the cooling metal plate (37) inside the mounting seat (33); and the extrusion wheel shaft (35) and the extrusion wheel (36) are cooled by passing coolant into the extrusion wheel shaft (35).

3. The method according to claim 1, characterized in that The scraping process includes a scraping process and a high-pressure blowing process. In the scraping process, cooling liquid is sprayed on the scraping position of the scraper (45). The high-pressure blowing process includes sequentially blowing the aluminum flat tube (1) vertically downward through an outer high-pressure nozzle, blowing the aluminum flat tube (1) vertically downward through an inner high-pressure nozzle, and blowing both sides of the aluminum flat tube (1) through a side high-pressure nozzle. The outer high-pressure nozzle is located outside the sealing chamber (48), and the inner high-pressure nozzle is located inside the sealing chamber (48).

4. Parallel flow aluminum flat tube production line, characterized by: It comprises an unwinding device, an aluminum strip straightening device, a preforming device, a weld straightening device (2), a welding device (3), a scraping device (4), a shaping device, a fine-tuning device and a cutting device, which are arranged in sequence from front to back; The unwinding device is used to output the aluminum strip backwards; The aluminum strip straightening device is used to straighten the aluminum strip; The preforming device is used to gradually bend the aluminum strip into a U-shaped structure that matches the shape of the aluminum flat tube (1); The weld straightening device (2) is used to first straighten the upper ends of the two arms of the U-shaped structure, and then straighten the two sides of the upper end of the U-shaped structure; The welding device (3) is used to first perform high-frequency heating on the aluminum flat tube (1), and then perform extrusion welding through two extrusion wheels (36); coolant is introduced into the extrusion wheel shaft (35) of the extrusion wheel (36), and the cooling metal plate (37) directly behind the extrusion wheel (36) sprays coolant on the rear of the extrusion wheel (36), and the coolant flowing out of the scraper device (4) cools the extrusion wheel (36) and the bearing seat (34); a first sponge (38) is provided between the extrusion wheel (36) and the mounting seat (33) to seal the extrusion wheel (36) and the mounting seat (33) and to scrub the extrusion wheel (36); The scraping device (4) is used to scrape the top of the aluminum flat tube (1) flat by means of a scraper (45); a cooling liquid tank (42) is provided at the feed port at the front end of the scraping device (4); the cooling liquid tank (42) contains cooling liquid, and the cooling liquid therein flows from the front end into between the two mounting seats (33), and two second sponges (44) are provided at the rear end thereof for sealing and for scrubbing both sides of the aluminum flat tube (1); the cooling liquid between the two mounting seats (33) flows out from the rear end thereof and the gap between the extrusion wheel (36) and the bearing seat (34); The shaping device is used to shape the aluminum flat tube (1); The fine-tuning device is used to fine-tune the left-right and vertical positions of the aluminum flat tube (1); The cutting device is used for cutting products into predetermined lengths.

5. The parallel flow aluminum flat tube production line according to claim 4 is characterized in that: The weld straightening device (2) comprises a front flat roller pair (21), a vertical roller pair (22) and a rear flat roller pair (23) which are arranged in sequence from front to rear; the front flat roller pair (21) and the rear flat roller pair (23) are synchronously driven and each comprises two straight flat rollers which are arranged side by side and located at the upper and lower sides of the aluminum flat tube (1) respectively; the straight flat rollers are arranged in the left and right directions; The vertical roller pair (22) comprises two relatively upright rollers arranged side by side and respectively located on the left and right sides of the aluminum flat tube (1); the relatively upright rollers are arranged vertically and have arc grooves coaxially arranged in the middle thereof to match the aluminum flat tube (1); A first lower groove is provided on the straighter flat roller at the lower part of the front flat roller pair (21), and two first upper grooves are provided side by side on the straighter flat roller at the upper part; a second lower groove is provided on the straighter flat roller at the lower part of the rear flat roller pair (23), and a second upper groove is provided on the straighter flat roller at the upper part; the first lower groove, the first upper groove, the second lower groove and the second upper groove are coaxially arranged with the corresponding straighter flat roller; the first lower groove and the second lower groove are both U-shaped grooves matched with the lower part of the aluminum flat tube (1), and their width is equal to the width of the aluminum flat tube (1); the two first upper grooves are respectively matched with the upper ends of the two arms of the aluminum flat tube (1), and are annular slits, and their width is the same as the thickness of the aluminum strip; the upper ends of the two arms of the aluminum flat tube (1) are respectively slidably arranged in the two first upper grooves, and their lower parts are slidably arranged in the first lower groove; The second upper groove cooperates with the upper part of the aluminum flat tube (1), and its left and right sides are respectively located on the outer sides of the corresponding sides of the upper ends of the two arms of the aluminum flat tube (1). It is an annular slit, and its width is the same as the thickness of the aluminum flat tube (1); the upper part of the aluminum flat tube (1) is slidably arranged in the second upper groove, and the lower part is slidably arranged in the second lower groove.

6. The parallel flow aluminum flat tube production line according to claim 5 is characterized in that: The scraper device (4) comprises a shell (41) arranged in a front-to-back direction, a cooling liquid tank (42) on the front side of the shell (41), a feed channel (43) on the front side of the shell (41), two second sponges (44) on the left and right sides of the rear end of the feed channel (43), a scraper (45) in the shell (41) and located at the top of the aluminum flat tube (1), a supporting chute (46) in the shell (41) and located directly below the scraper (45), and a cooling liquid nozzle (47) in the shell (41) and located next to the scraper (45). ), a discharge channel (49) on the rear side of the shell (41), a sealing chamber (48) at the front end of the discharge channel (49), an external high-pressure nozzle between the scraper (45) and the sealing chamber (48), an internal high-pressure nozzle in the sealing chamber (48) and two groups of side high-pressure nozzles on the left and right sides of the discharge channel (49), the support chute (46) is arranged in the front-to-back direction and is located at the lower part of the aluminum flat tube (1), and the coolant nozzle (47) is directed toward the scraped portion at the top of the aluminum flat tube (1) and is connected to the coolant circulation structure through a pipeline; The two groups of side high-pressure nozzles are respectively located on the left and right sides of the aluminum flat tube (1), and the outer high-pressure nozzle and the inner high-pressure nozzle are both located directly above the aluminum flat tube (1). The side high-pressure nozzle, the outer high-pressure nozzle and the inner high-pressure nozzle are all connected to the compressed air supply structure through pipelines and are all arranged toward the aluminum flat tube (1); an opening is provided on the upper side of the front end of the coolant tank (42) for the aluminum flat tube (1) to pass through, and its front end is located adjacent to the rear of the welding device (3), and is connected to the coolant circulation structure through pipelines, and its rear end is connected to the feed channel (43); the front end of the aluminum flat tube (1) is connected; the aluminum flat tube (1) is immersed in the coolant in the coolant tank (42); two second sponges (44) are arranged side by side and tightly together, and are respectively located on the left and right sides of the aluminum flat tube (1), and seal the rear end of the feed channel (43); the front side of the sealing chamber (48) is provided with a strip hole for the aluminum flat tube (1) to pass through, and the lower side is provided with a chip discharge port; the coolant circulation structure is used to collect the coolant output by the scraping device (4) and the welding device (3) and cool and filter it.

7. The parallel flow aluminum flat tube production line according to claim 6 is characterized in that: The welding device (3) comprises a guide bar (31), a high-frequency coil (32) and an extrusion wheel assembly which are arranged in sequence from front to back; The high-frequency coil (32) is arranged in the front-to-back direction, is located adjacent to the front of the extrusion wheel assembly, and is sleeved outside the aluminum flat tube (1); the guide bar (31) is arranged in the front-to-back direction, and its rear end extends into the high-frequency coil (32), and is located between the upper ends of the two arms of the aluminum flat tube (1); The extrusion wheel assembly comprises two welding units arranged side by side on the left and right, the welding units comprising a mounting seat (33), a bearing seat (34) at the inner end of the front side of the mounting seat (33), an extrusion wheel shaft (35) arranged vertically on the upper side of the bearing seat (34), an extrusion wheel (36) arranged coaxially on the extrusion wheel shaft (35), a cooling metal plate (37) arranged on the inner side of the mounting seat (33) and in the front-to-back direction, and a first sponge (38) between the front end of the mounting seat (33) and the extrusion wheel (36), the two mounting seats (33) are arranged side by side on the left and right, the two extrusion wheels (36) are respectively located on the left and right sides of the aluminum flat tube (1), a coolant channel is coaxially arranged in the extrusion wheel shaft (35), and the upper end of the coolant channel is connected to the coolant circulation structure through a pipeline; the two cooling plates The metal plates (37) are respectively located on the left and right sides of the aluminum flat tube (1), and are respectively located directly behind the two extrusion wheels (36); a cooling cavity is provided in the cooling metal plate (37), and a plurality of spray holes are arranged side by side on the upper and lower sides of the front side, and the top rear end is connected to the coolant circulation structure through a pipeline; the spray holes are arranged toward the rear of the corresponding extrusion wheel (36); the coolant flowing out of the front end of the coolant tank (42) flows between the two mounting seats (33), and the coolant flows out from the gap between the rear ends of the two mounting seats (33) and between the extrusion wheel (36) and the bearing seat (34), and the aluminum flat tube (1) is fully or partially immersed in the coolant between the two mounting seats (33); the first sponge (38) is used to seal between the extrusion wheel (36) and the mounting seat (33).

8. The parallel flow aluminum flat tube production line according to claim 7 is characterized in that: The fine-tuning device comprises a left-right fine-tuning structure, an eddy current flaw detection structure, a length measuring structure and a vertical fine-tuning structure which are arranged in sequence from front to back; The left-right fine-tuning structure comprises two horizontal fine-tuning units arranged side by side and located on the left and right sides of the aluminum flat tube (1), respectively; the horizontal fine-tuning unit comprises a first adjustment seat arranged in the front-to-back direction and two fine-tuning vertical rollers arranged side by side on its inner side; the fine-tuning vertical rollers are arranged vertically, abutting against the corresponding side of the aluminum flat tube (1), having a smooth roller surface, and being arranged on the first adjustment seat for left-right fine-tuning; a total of four fine-tuning vertical rollers on the left and right sides are arranged staggered front-to-back; The vertical fine-tuning structure comprises a second adjustment seat arranged in the front-to-back direction and a plurality of pairs of vertical fine-tuning wheel pairs arranged in parallel in the front-to-back direction on the second adjustment seat; the vertical fine-tuning wheel pairs comprise two fine-tuning disks arranged in parallel in the upper and lower directions and driven synchronously; the two fine-tuning disks are respectively located on the upper and lower sides of the aluminum flat tube (1), and they are pressed against each other, and grooves coaxially matched with half of the aluminum flat tube (1) are arranged on the circumference of the two fine-tuning disks; the upper and lower parts of the aluminum flat tube (1) are respectively located in the grooves of the two fine-tuning disks; the fine-tuning disks are arranged in the left-right direction and are arranged on a slider; a plurality of strip openings are arranged in parallel in the front-to-back direction on the second adjustment seat, and the strip openings are arranged vertically; the two sliders of the same vertical fine-tuning wheel pair are slidably arranged in the same strip opening and can be vertically fine-tuned.

9. The parallel flow aluminum flat tube production line according to claim 8, characterized in that: The shaping device comprises M vertical roller shaping wheel pairs and N flat roller shaping wheel pairs, M and N are integers greater than or equal to 2, MN≥2; the vertical roller shaping wheel pairs and the flat roller shaping wheel pairs are arranged alternately, the vertical roller shaping wheel pairs comprise two shaping vertical rollers arranged side by side and respectively located on the left and right sides of the aluminum flat tube (1); the shaping vertical rollers are arranged vertically, and cleaning sponges are closely attached to the outer sides thereof; the flat roller shaping wheel pairs comprise two shaping flat rollers arranged side by side and respectively located on the upper and lower sides of the aluminum flat tube (1); the shaping flat rollers are arranged in the left and right directions; arc grooves are coaxially arranged on the roller surfaces of the shaping vertical rollers of the front vertical roller shaping wheel pair, no grooves are arranged on the roller surfaces of the shaping vertical rollers of the middle vertical roller shaping wheel pair, and rectangular grooves are coaxially arranged on the roller surfaces of the shaping vertical rollers of the rear vertical roller shaping wheel pair; The cutting device is a flying shear cutting device.

10. The parallel flow aluminum flat tube production line according to claim 9, characterized in that: The high-frequency coil (32) is arranged on the adjustment arm and can be adjusted vertically and left-right; the guide bar (31) can be adjusted front-back and vertically; the mounting seat (33) can be adjusted left-right; the scraper (45) can be adjusted left-right and vertically; the supporting slide groove (46) can be adjusted vertically; the shaping vertical roller can be adjusted left-right; and the shaping flat roller can be adjusted vertically.

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