Method for producing parallel flow aluminum flat tubes and production line therefor

Abstract

The application discloses a production method and production line of parallel flow aluminum flat tube and belongs to the technical field of aluminum flat tube. The method comprises the following steps: a unwinding process, a straightening process, a preforming process, a welding process, a scrap removing process, a shaping process and a cutting process; a weld joint straightening process is arranged between the preforming process and the welding process, a cooling and cleaning process is arranged between the welding process and the scrap removing process, and a fine adjustment process is arranged between the shaping process and the cutting process; the weld joint straightening process is used for straightening the upper ends of the two arms of the U-shaped structure firstly and then straightening the two sides of the upper end of the U-shaped structure; the cooling and cleaning process is used for sequentially passing the aluminum flat tube through the cooling liquid between two mounting seats and the cooling liquid in a cooling liquid tank; the cooling liquid in the cooling liquid tank flows out to the space between the two mounting seats, the rear end of the cooling liquid tank is provided with two second sponge bodies for sealing the space and scrubbing the two sides of the aluminum flat tube; and the fine adjustment process is used for fine adjusting the aluminum flat tube in the left-right direction firstly and then fine adjusting the aluminum flat tube in the vertical direction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aluminum flat tube processing, and particularly relates to a production method of parallel flow aluminum flat tube and a production line thereof. BACKGROUND

[0002] At present, the condensers and evaporators of automobile air conditioners no longer adopt the tube sheet type structure manufactured by copper tube and aluminum foil. Almost all automobiles adopt aluminum material parallel flow type condensers and laminated evaporators, which have the advantages of light weight and good heat exchange performance. The parallel flow type heat exchanger adopts a porous micro-channel flat tube, the thickness size of which is below 1.5 mm, the wall thickness size is below 0.4 mm, and the channel size is about 0.5 mm.

[0003] For example, the patent with the application number CN201510126250.4 discloses a manufacturing method of anti-rust aluminum alloy flat tube for automobile water tank and air conditioner condenser, which is realized through the following steps:

[0004] Step 1, preparing raw materials: adopting anti-rust aluminum alloy LF21 or 3003 aluminum rod with an outer diameter of Φ150 mm, the length of the aluminum rod is between 600 mm and 900 mm.

[0005] Step 2, peeling the surface of the aluminum rod: using a lathe to peel the outer surface of the aluminum rod to remove the skin impurities.

[0006] Step 3, extrusion: using a horizontal extruder with a tonnage of more than 1350 tons, heating the aluminum rod to 480-500℃, and continuously extruding the aluminum rod into a round billet tube with an outer diameter of Φ20 mm-Φ40 mm and a wall thickness of 1.2 mm-2.5 mm through a die.

[0007] Step 4, cold-drawing reduction: on an inverted disc drawing machine, through different specifications of outer diameter dies and built-in free core injection of aluminum alloy outer film oil and inner film oil at a speed of 200-800 meters per minute, 5-8 passes of circumferential continuous rotary cold-drawing are carried out to reduce the diameter, and finally a round tube with an outer diameter of Φ5 mm-Φ30 mm and a wall thickness of 0.25 mm-0.5 mm is obtained.

[0008] Step 5, uncoiling: the round tube with an outer diameter of Φ5 mm-Φ30 mm and a wall thickness of 0.25 mm-0.5 mm is uncoiled through an automatic uncoiling machine.

[0009] Step 6, primary cleaning: cleaning is carried out in a cleaning unit, and the round tube surface is cleaned of drawing oil, dust and impurities by volatile oil.

[0010] Step 7, round tube straightening: the cleaned round tube is straightened through horizontal and vertical straightening wheels on a straightening machine, and the size of the straightening wheels can be quickly replaced according to different specifications of the round tube.

[0011] Step 8, flaw detection: non-destructive flaw detection on an eddy current flaw detector.

[0012] Step 9, forming flat tube: forming flat tubes with various models of width 8mm-40mm, thickness 1mm-4mm, and wall thickness 0.25mm-0.5mm by a forming unit, and different specifications of products can be quickly changed to achieve the roller of the forming unit.

[0013] Step 10, flat tube straightening: further straightening the flat tube on the horizontal and vertical straightening wheels after forming.

[0014] Step 11, secondary cleaning: cleaning again by a cleaning unit, and further cleaning the surface residual oil and impurities with volatile oil.

[0015] Step 12, shearing: finally, shearing by a high-speed flying shear device.

[0016] Step 13, packaging: packaging the qualified finished product tube for delivery.

[0017] The process adopts the preparation of a round tube first, and then the round tube is flattened to obtain a flat tube. The process will cause uneven deformation in the flattening process, resulting in low pressure resistance and irregular shape of the flattened tube. Therefore, the aluminum strip is usually used in the prior art by bending and forming and extrusion welding to the aluminum flat tube.

[0018] As the patent with application number CN201110073278.8 discloses a roll bending forming manufacturing method of a porous micro-channel flat tube, comprising the following steps: first, the metal strip roll is unwound, straightened, and cleaned online, and then sent to a roller press to press out micro-channels, the roller press is provided with a series of roller pairs, the metal plate material advances along the roller pairs, and a series of micro-channels are formed on the metal plate material by the roller pairs; then, the metal plate material enters a plurality of pass forming rollers arranged in sequence, the rollers gradually bend the incoming strip material from a flat state into a symmetrical two sides; finally, the symmetrical two sides are connected to form the porous micro-channel flat tube. The connection method of the symmetrical two sides is to first heat rapidly by a high-frequency heating device to reach the welding temperature, and then perform pressure welding. After the connection of the symmetrical two sides, the flat tube is further corrected, finished, and inspected.

[0019] The corresponding production line can be seen in the following patents:

[0020] As the patent application number CN201110073278.8 discloses a kind of porous microchannel flat tube roll bending forming manufacturing equipment, comprising: uncoiler, for releasing the metal sheet material of package;Feeding device, for the metal sheet material is sent into forming section smoothly;Feeding device, the metal sheet material of sent in keeps flat, avoid when feeding, occur lateral slip;Embossing machine, for the microgroove shape of required on the metal sheet material of sent in, complete embossing process;Center bending device, for determining the symmetry center of sheet material bending;Roll bending forming device, the metal sheet material of flat is gradually bent into two symmetrical sides;Connecting device, the connection of the two symmetrical sides is completed, and the porous microchannel flat tube is formed.

[0021] As the patent application number CN201710135680.1 discloses a kind of high-frequency welding pipe making machine, it is characterized by: including the uncoiling unit, the transfer unit, the storage unit, the traction unit, the area dotting unit, the forming unit, the welding unit, the scrap removal unit, the shaping unit, the cutting unit and the sorting unit in turn;The uncoiling unit includes protective frame, aluminium strip roll fixing mechanism, drive mechanism and speed control mechanism, the drive mechanism is connected aluminium strip roll fixing mechanism, aluminium strip roll fixing mechanism is located in protective frame, aluminium strip roll fixing mechanism and drive mechanism are equipped with at least one set, when multiple sets, the axis of two aluminium strip roll fixing mechanisms is parallel;The speed control mechanism includes guide plate, guide wheel I, guide wheel II and guide wheel III, guide plate is located on the upper portion of protective frame of discharge end, guide wheel I and guide wheel II are located on the discharge end of guide plate, guide wheel III slides in the lower of guide wheel I and guide wheel II.

[0022] A patent with application number CN202321947516.8 discloses an aluminum heat dissipation pipe production line, which comprises: an aluminum strip roll including a strip-shaped aluminum plate and a reel; a machine table for installing components required by the aluminum heat dissipation pipe production line, wherein the side surface and the top end have a wire line connected with each component; a unwinding assembly installed on one side of the top end of the machine table, used for fixing the aluminum strip roll and rotating the aluminum strip roll at the top end of the unwinding assembly; a rough forming assembly installed at the middle of the top end of the machine table, used for coiling the strip-shaped aluminum plate of the aluminum strip roll and moving one end of the strip-shaped aluminum plate to a predetermined position; a conveying assembly installed on the top end of the machine table and located on one side of the unwinding assembly, used for conveying one end of the strip-shaped aluminum plate of the aluminum strip roll to the predetermined position at one end of the rough forming assembly, the conveying assembly has a traction assembly to transmit the strip-shaped aluminum plate of the aluminum strip roll to the inside of the rough forming assembly for processing; a welding assembly installed on the top end of the machine table and located at the other end of the rough forming assembly, used for welding the strip-shaped aluminum plate of the aluminum strip roll transmitted by the rough forming assembly into a rough aluminum heat dissipation pipe; a surface treatment assembly installed on the top end of the machine table and located on one side of the welding assembly, used for cleaning the weld and surface dust of the rough aluminum heat dissipation pipe; a finishing forming assembly installed on the top end of the machine table and located on one side of the surface treatment assembly, used for fine shaping the treated aluminum heat dissipation pipe; a speed detection assembly installed on the top end of the machine table and located on one side of the finishing forming assembly, used for detecting the moving speed of the aluminum heat dissipation pipe; and a cutting assembly installed on the top end of the machine table and located on one side of the speed detection assembly, used for shearing the shaped aluminum heat dissipation pipe according to the preset length.

[0023] The quality control of the parallel flow aluminum flat tube mainly has two aspects:

[0024] One is the pressure resistance of the parallel flow aluminum flat tube (detection is performed by passing a detection liquid into the parallel flow aluminum flat tube);

[0025] The other is the dimensional accuracy, and high dimensional accuracy can ensure easy installation and reduce the possibility of leakage.

[0026] The patent provides a production method and production line of a parallel flow aluminum flat tube, which ensures that the parallel flow aluminum flat tube has high pressure resistance and high dimensional accuracy under high-speed production. SUMMARY

[0027] The embodiment of the application provides a production method and production line of a parallel flow aluminum flat tube, which ensures that the parallel flow aluminum flat tube has high pressure resistance and high dimensional accuracy under high-speed production (speed greater than 130 m / min). The technical solution is as follows:

[0028] In one aspect, the embodiment of the present application provides a production method of parallel flow aluminum flat tube, which adopts the production line of the parallel flow aluminum flat tube of the present application, and comprises the following steps: a unwinding process, a straightening process, a preforming process, a welding process, a scrap removing process, a shaping process and a cutting process; a weld seam straightening process is arranged between the preforming process and the welding process, a cooling and cleaning process is arranged between the welding process and the scrap removing process, and a fine adjustment process is arranged between the shaping process and the cutting process; the preforming process gradually bends the aluminum strip into a U-shaped structure matched with the shape of the aluminum flat tube 1; the weld seam 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 comprises a high-frequency heating process and an extrusion welding process; the cooling and cleaning process is that the aluminum flat tube 1 sequentially passes through the cooling liquid between the two mounting seats 33 of the welding device 3 and the cooling liquid in the cooling liquid tank 42 at the front end of the scrap removing device 4; the cooling liquid in the cooling liquid tank 42 flows out from the front end to the space between the two mounting seats 33, and the rear end of the cooling liquid tank 42 is provided with two second sponge bodies 44 for sealing and scrubbing the two sides of the aluminum flat tube 1; the cooling liquid between the two mounting seats 33 flows out from the rear end of the two mounting seats 33 and the gap between the extrusion wheel 36 and the bearing seat 34; the fine adjustment process first adjusts the aluminum flat tube 1 in the left-right direction, and then adjusts the aluminum flat tube 1 in the vertical direction.

[0029] Preferably, in 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; in the extrusion welding process, the rear part of the extrusion wheel 36 is cooled and cleaned by the cooling liquid sprayed forward by the cooling metal plate 37 on the inner side of the mounting seat 33; the cooling of the extrusion wheel shaft 35 and the extrusion wheel 36 is realized by feeding the cooling liquid into the extrusion wheel shaft 35.

[0030] The scrap removing process comprises a scraping process and a high-pressure blowing process, in the scraping process, the cooling liquid is sprayed at the scraping position of the scraper 45; the high-pressure blowing process comprises sequentially blowing the aluminum flat tube 1 vertically downward by the outer high-pressure nozzle, blowing the aluminum flat tube 1 vertically downward by the inner high-pressure nozzle and blowing the two sides of the aluminum flat tube 1 by the 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.

[0031] In another aspect, the embodiment of the present application also provides a production line of parallel flow aluminum flat tube, comprising, from front to back, a winding device, an aluminum tape straightening device, a pre-forming device, a weld seam straightening device 2, a welding device 3, a scrap removing device 4, a shaping device, a fine adjustment device and a cutting device; the winding device is used to output the aluminum tape rearward; the aluminum tape straightening device is used to straighten the aluminum tape; the pre-forming device is used to gradually bend the aluminum tape into a U-shaped structure matching the shape of the aluminum flat tube 1; the weld seam straightening device 2 is used to straighten the upper ends of the two arms of the U-shaped structure first, and then straighten the two sides of the upper end of the U-shaped structure; the welding device 3 is used to first heat the aluminum flat tube 1 by high frequency, 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, the cooling metal plate 37 behind the extrusion wheel 36 sprays cooling liquid to the rear part of the extrusion wheel 36, and the cooling liquid flowing out of the scrap removing device 4 cools the extrusion wheel 36 and the bearing seat 34; a first sponge body 38 is arranged 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 scrap removing device 4 is used to scrape the top of the aluminum flat tube 1 flat through the scraper 45; a cooling liquid tank 42 is arranged at the feed inlet of the front end of the scrap removing device 4; the cooling liquid tank 42 contains cooling liquid, the cooling liquid in the cooling liquid tank 42 flows from the front end into the space between the two mounting seats 33, and the rear end of the cooling liquid tank 42 is provided with two second sponge bodies 44 for sealing and scrubbing the two sides of the aluminum flat tube 1; the cooling liquid between the two mounting seats 33 flows out from the gap between the rear end and the extrusion wheel 36 and the bearing seat 34; the shaping device is used to shape the aluminum flat tube 1; the fine adjustment device is used to fine adjust the position of the aluminum flat tube 1 in the left-right direction and the vertical direction; and the cutting device is used to cut to obtain products of a predetermined length.

[0032] The weld straightening device 2 comprises 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 synchronously driven, and each comprises two straight flat rollers arranged in parallel and located on the upper and lower sides of the aluminum flat tube 1; the straight flat rollers are arranged in left and right directions; the vertical roller pair 22 comprises two straight vertical rollers arranged in parallel and located on the left and right sides of the aluminum flat tube 1, and the straight vertical rollers are vertically arranged and coaxially provided with a circular arc groove at the middle portion for cooperating with the aluminum flat tube 1; a first lower groove is arranged on the lower straight flat roller of the front flat roller pair 21, and two first upper grooves are arranged on the upper straight flat roller in left and right directions; a second lower groove is arranged on the lower straight flat roller of the rear flat roller pair 23, and a second upper groove is arranged on the upper straight flat roller; the first lower groove, the first upper groove, the second lower groove and the second upper groove are coaxially arranged with the corresponding straight flat rollers; the first lower groove and the second lower groove are U-shaped grooves matched with the lower portion of the aluminum flat tube 1, and the width of the U-shaped grooves is equal to the width of the aluminum flat tube 1; the two first upper grooves are annular slits matched with the upper ends of the two arms of the aluminum flat tube 1, and the width of the annular slits is equal to the thickness of the aluminum flat tube 1; the upper ends of the two arms of the aluminum flat tube 1 are slidably arranged in the two first upper grooves, and the lower portion of the aluminum flat tube 1 is slidably arranged in the first lower groove; the second upper groove is matched with the upper portion of the aluminum flat tube 1, and the left and right sides of the second upper groove are located outside the corresponding sides of the upper ends of the two arms of the aluminum flat tube 1, and the second upper groove is an annular slit with a width equal to the thickness of the aluminum flat tube 1; the upper portion of the aluminum flat tube 1 is slidably arranged in the second upper groove, and the lower portion of the aluminum flat tube 1 is slidably arranged in the second lower groove.

[0033] The scrap removing device 4 comprises a housing 41 arranged in the front-rear direction, a cooling liquid tank 42 on the front side of the housing 41, a feeding channel 43 on the front side in the housing 41, two second sponge bodies 44 on the left and right sides of the rear end of the feeding channel 43, a scraper 45 in the housing 41 and located at the top of the aluminum flat tube 1, a supporting chute 46 in the housing 41 and located directly below the scraper 45, a cooling liquid spray head 47 in the housing 41 and located beside the scraper 45, a discharging channel 49 on the rear side of the housing 41, a sealing chamber 48 at the front end of the discharging channel 49, an outer high-pressure spray head between the scraper 45 and the sealing chamber 48, an inner high-pressure spray head in the sealing chamber 48, and two groups of side high-pressure spray heads on the left and right sides of the discharging channel 49. The supporting chute 46 is arranged in the front-rear direction and located at the lower part of the aluminum flat tube 1. The cooling liquid spray head 47 is directed to the scraped flat part at the top of the aluminum flat tube 1 and connected to a cooling liquid circulation structure through a pipeline. The two groups of side high-pressure spray heads are respectively located on the left and right sides of the aluminum flat tube 1. The outer high-pressure spray head and the inner high-pressure spray head are both located directly above the aluminum flat tube 1. The side high-pressure spray head, the outer high-pressure spray head, and the inner high-pressure spray head are all connected to a compressed air supply structure through a pipeline and are all directed to the aluminum flat tube 1. The front end of the cooling liquid tank 42 is provided with an opening through which the aluminum flat tube 1 passes. The front end is located adjacent to the rear of the welding device 3. The cooling liquid tank 42 is connected to the cooling liquid circulation structure through a pipeline and is communicated with the front end of the feeding channel 43. The aluminum flat tube 1 is immersed in the cooling liquid in the cooling liquid tank 42. The two second sponge bodies 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. The two second sponge bodies 44 seal the rear end of the feeding channel 43. The sealing chamber 48 is provided with a strip-shaped hole through which the aluminum flat tube 1 passes and is provided with a chip discharging port on the lower side. The cooling liquid circulation structure is used to collect the cooling liquid output by the scrap removing device 4 and the welding device 3 and to cool and filter the cooling liquid.

[0034] The welding device 3 comprises a guide strip 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 front-rear direction and is located adjacent to the front of the extrusion wheel assembly and is sleeved on the outer surface of the aluminum flat tube 1. The guide strip 31 is arranged in front-rear 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, each welding unit comprises a mounting seat 33, a bearing seat 34 arranged 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 in front-rear direction on the inner side of the mounting seat 33 and a first sponge body 38 arranged between the front end of the mounting seat 33 and the extrusion wheel 36. The two mounting seats 33 are arranged side by side, and the two extrusion wheels 36 are located on the left and right sides of the aluminum flat tube 1 respectively. The extrusion wheel shaft 35 is coaxially provided with a cooling liquid channel, and the upper end of the cooling liquid channel is connected with a cooling liquid circulation structure through a pipeline. The two cooling metal plates 37 are located on the left and right sides of the aluminum flat tube 1 respectively and are located behind the two extrusion wheels 36 respectively. The cooling metal plate 37 is provided with a cooling cavity, a plurality of spray holes are arranged on the front side of the cooling metal plate 37 in up-down direction, and the top rear end of the cooling metal plate 37 is connected with the cooling liquid circulation structure through a pipeline. The spray holes are arranged towards the rear of the corresponding extrusion wheel 36. The cooling liquid flowing out of the front end of the cooling liquid groove 42 flows between the two mounting seats 33, and the cooling liquid flows out of the gap between the rear ends of the two mounting seats 33 and between the extrusion wheel 36 and the bearing seat 34. The aluminum flat tube 1 is fully or partially immersed in the cooling liquid between the two mounting seats 33. The first sponge body 38 is used for sealing between the extrusion wheel 36 and the mounting seat 33.

[0035] The fine adjustment device in the embodiment of the present application comprises left-right fine adjustment structure, eddy current flaw detection structure, length counting structure and vertical fine adjustment structure arranged in sequence from front to back; the left-right fine adjustment structure comprises two horizontal fine adjustment units arranged side by side and respectively located on the left and right sides of the aluminum flat tube 1, the horizontal fine adjustment unit comprises a first adjustment seat arranged in front-back direction and two fine adjustment vertical rollers arranged side by side in front-back direction in the first adjustment seat; the fine adjustment vertical roller is arranged vertically, abuts against the corresponding side of the aluminum flat tube 1, has smooth roller surface and is arranged on the first adjustment seat in left-right fine adjustment manner; the four fine adjustment vertical rollers on the left and right sides are arranged in front-back staggered manner; the vertical fine adjustment structure comprises a second adjustment seat arranged in front-back direction and a plurality of pairs of vertical fine adjustment wheel pairs arranged side by side in front-back direction on the second adjustment seat; the vertical fine adjustment wheel pair comprises two fine adjustment discs arranged side by side in up-down direction and driven synchronously; the two fine adjustment discs are respectively located on the upper and lower sides of the aluminum flat tube 1, abut against each other and have coaxial grooves on the circumferential surface and cooperate with 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 adjustment discs; the fine adjustment disc is arranged in left-right direction and arranged on the sliding block; a plurality of strip-shaped openings are arranged side by side in front-back direction on the second adjustment seat, the strip-shaped openings are arranged vertically; the two sliding blocks of the same vertical fine adjustment wheel pair are arranged in the same strip-shaped opening and can be vertically fine adjusted.

[0036] The shaping device in the embodiment of the present application comprises M vertical roller shaping wheel pairs and N horizontal roller shaping wheel pairs, M and N are integers greater than or equal to 2 and M-N≥2; the vertical roller shaping wheel pairs and the horizontal roller shaping wheel pairs are arranged alternately, the vertical roller shaping wheel pair comprises 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 roller is arranged vertically and has a cleaning sponge closely attached to the outer side; the horizontal roller shaping wheel pair comprises two shaping horizontal rollers arranged side by side in up-down direction and respectively located on the upper and lower sides of the aluminum flat tube 1; the shaping horizontal roller is arranged in left-right direction; the roller surface of the shaping vertical roller of the front vertical roller shaping wheel pair is coaxially provided with a circular arc groove, the roller surface of the shaping vertical roller of the middle vertical roller shaping wheel pair is not provided with a groove, and the roller surface of the shaping vertical roller of the rear vertical roller shaping wheel pair is coaxially provided with a rectangular groove; the cutting device is a flying shear cutting device.

[0037] Further, the high-frequency coil 32 in the embodiment of the present application is arranged on the adjustment arm and can be adjusted vertically and left-right; the guide strip 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 support sliding groove 46 can be adjusted vertically; the shaping vertical roller can be adjusted left-right; and the shaping horizontal roller can be adjusted vertically.

[0038] The technical scheme provided by the embodiment of the present application has the following beneficial effects:

[0039] (1) The weld straightening device realizes the shaping and straightening of the upper ends of the two arms of the aluminum flat tube, so as to ensure the subsequent welding effect.

[0040] (2) The guiding assembly has three functions: one is guiding, the other is avoiding deformation (especially inward) when heated, and the third is closing the upper end of the aluminum flat tube to avoid impurities and cooling liquid from entering.

[0041] (3) The cooling liquid flowing out between the extrusion wheel and the bearing seat cools the bearing seat and the extrusion wheel.

[0042] (4) The cooling metal plate cools the cooling liquid between the two mounting seats and the aluminum flat tube, and the sprayed cooling liquid cools and cleans the extrusion wheel. The first sponge has two functions: one is to achieve sealing, and the other is to achieve scrubbing of the extrusion wheel.

[0043] (5) The cooling liquid in the cooling liquid tank and the two mounting seats cools and cleans the aluminum flat tube and the extrusion wheel, facilitating chip removal, and can cool the aluminum flat tube to below 50°C.

[0044] (6) The second sponge has multiple functions: one is to close the rear end of the feeding channel, the second is to scrub the aluminum flat tube, and the third is to absorb the cooling liquid on the aluminum flat tube.

[0045] (7) The side high-pressure nozzle, the outer high-pressure nozzle, and the inner high-pressure nozzle dry and clean the aluminum flat tube, isolate the sealed chamber, and ensure cleaning effect; and further reduce the temperature of the aluminum flat tube, which can be reduced to below 35°C, to facilitate subsequent forming processing.

[0046] (8) According to customer feedback, the precision and length precision of the aluminum flat tube on both sides are high; then through the special design of the vertical roller shaping wheel pair (more vertical rollers, different structures of vertical rollers at different positions, and the setting of cleaning sponges, etc.), to ensure the precision of both sides. The length precision is ensured by the setting of the fine adjustment device, and the vertical position fine adjustment also avoids the aluminum flat tube from shaking up and down when cutting, further ensuring the precision.

[0047] (9) The processing speed of the aluminum flat tube of the present patent is greater than 130 m / min (usually greater than 150 m / min), and the aluminum flat tube's compression resistance is improved by at least 15% compared to the prior art; specifically, the welding size error of the aluminum flat tube is less than 0.02 mm, the size error of the chip removal is less than 0.02 mm, the thickness error is less than 0.01 mm, and the cutting error is less than 0.1 mm. As shown in the figure, the top of the aluminum flat tube is smooth and completely free of welding marks. Figure 9 BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is a principle diagram of the production line of the parallel flow aluminum flat tube in the embodiment of the present application;

[0049] Figure 2 ​It is a structure schematic diagram of the combination of the weld straightening device and the welding device.

[0050] Figure 3 It is a structure schematic diagram of the upper flat roller of the front flat roller pair.

[0051] Figure 4 It is a structure schematic diagram of the vertical roller.

[0052] Figure 5 It is a structure schematic diagram of the upper flat roller of the rear flat roller pair.

[0053] Figure 6 It is a structure schematic diagram of the scrap removing device.

[0054] Figure 7 It is a structure schematic diagram of the left-right fine adjustment structure.

[0055] Figure 8 It is a structure schematic diagram of the vertical fine adjustment structure.

[0056] Figure 9 It is an appearance schematic diagram of the welded end of the aluminum flat tube prepared by the present application.

[0057] In the figure: 1 aluminum flat tube, 2 weld straightening device, 3 welding device, 4 scrap removing device.

[0058] 21 front flat roller pair, 22 vertical roller pair, 23 rear flat roller pair.

[0059] 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.

[0060] 41 shell, 42 cooling liquid groove, 43 feeding channel, 44 second sponge body, 45 scraper, 46 supporting sliding groove, 47 cooling liquid nozzle, 48 sealing chamber, 49 discharging channel. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings.

[0062] Example 1

[0063] Referring to Figures 1-8 , Example 1 provides a production line of parallel flow aluminum flat tube, which comprises, from front to back, a pay-off device, an aluminum strip straightening device, a pre-forming device, a weld straightening device 2, a welding device 3, a scrap removing device 4, a shaping device, a fine adjustment device and a cutting device.

[0064] Among them, the pay-off device is used for outputting the aluminum strip to the rear, which is consistent with the conventional technology.

[0065] The aluminum strip straightening device is used to straighten the aluminum strip, which is consistent with the conventional technology.

[0066] The pre-forming device is used to gradually bend the aluminum strip into a U-shaped structure matching the shape of the aluminum flat tube 1, which is consistent with the conventional technology.

[0067] The weld seam straightening device 2 is used to straighten the upper ends of the two arms of the U-shaped structure first, and then straighten the two sides of the upper end of the U-shaped structure.

[0068] The welding device 3 is used to first heat the aluminum flat tube 1 by high frequency, and then perform extrusion welding by two extrusion wheels 36. Cooling liquid is supplied to 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 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 scrap removal device 4 cools the extrusion wheel 36 and the bearing seat 34. The first sponge body 38 between the extrusion wheel 36 and the mounting seat 33 seals the space between the extrusion wheel 36 and the mounting seat 33, and performs scrubbing and drying of the cooling liquid.

[0069] The scrap removal device 4 is used to scrape the top of the aluminum flat tube 1 by the scraper 45. The cooling liquid tank 42 is provided at the feed inlet of the front end of the scrap removal device 4. The cooling liquid tank 42 contains cooling liquid, which flows from the front end into the space between the two mounting seats 33. The rear end of the cooling liquid tank 42 is sealed by the two second sponge bodies 44, which scrub the two sides of the aluminum flat tube 1, and are used to cool and clean the aluminum flat tube 1. The cooling liquid between the two mounting seats 33 flows out from the gap between the rear end and the extrusion wheel 36 and the bearing seat 34.

[0070] The shaping device is used to shape the aluminum flat tube 1.

[0071] The fine adjustment device is used to fine adjust the position of the aluminum flat tube 1 in the left-right direction and the vertical direction to ensure the cutting accuracy.

[0072] The cutting device is used to cut the aluminum flat tube 1 into products of a predetermined length, which is consistent with the conventional technology. Specifically, the cutting device can be a flying shear cutting device.

[0073] Example 2

[0074] Example 2 provides a production line for a parallel flow aluminum flat tube, which has a structure basically the same as that of Example 1, except that:

[0075] Referring to Figures 2-5The weld straightening device 2 in the embodiment of the present application comprises 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 synchronously driven (specifically through two synchronously driven universal shafts), and each comprises two straight flat rollers arranged side by side above and below the aluminum flat tube 1. The straight flat rollers are arranged in the left-right direction. The vertical roller pair 22 comprises two straight vertical rollers arranged side by side on the left and right sides of the aluminum flat tube 1, and the straight vertical rollers are vertically arranged and coaxially provided with a circular arc groove matched with the aluminum flat tube 1 in the middle.

[0076] The straight flat roller at the lower part of the front flat roller pair 21 is provided with a first lower groove, and the straight flat roller at the upper part thereof is provided with two first upper grooves arranged side by side. The straight flat roller at the lower part of the rear flat roller pair 23 is provided with a second lower groove, and the straight flat roller at the upper part thereof is provided with a second upper groove located directly above the second lower groove. The first lower groove, the first upper grooves, the second lower groove and the second upper groove are coaxially arranged with the corresponding straight flat rollers. The first lower groove and the second lower groove are U-shaped grooves matched with the lower part of the aluminum flat tube 1, and the width thereof is equal to the width of the aluminum flat tube 1 (with a small gap therebetween to facilitate sliding). The two first upper grooves are ring-shaped slits matched with the upper ends of the two arms of the aluminum flat tube 1, and the width thereof is equal to the thickness of the aluminum flat tube 1 (with a small gap therebetween to facilitate sliding). The upper ends of the two arms of the aluminum flat tube 1 are slidably arranged in the two first upper grooves, and the lower part thereof is slidably arranged in the first lower groove. The second upper groove is a ring-shaped slit matched with the upper part of the aluminum flat tube 1, and the left and right sides thereof are located outside the corresponding sides of the upper ends of the two arms of the aluminum flat tube 1, and the width thereof is equal to the thickness of the aluminum flat tube 1 (with a small gap therebetween to facilitate sliding). The upper part of the aluminum flat tube 1 is slidably arranged in the second upper groove, and the lower part thereof is slidably arranged in the second lower groove.

[0077] The straight flat roller at the lower part of the front flat roller pair 21 is provided with a first lower groove, and the straight flat roller at the upper part thereof is provided with two first upper grooves arranged side by side. The straight flat roller at the lower part of the rear flat roller pair 23 is provided with a second lower groove, and the straight flat roller at the upper part thereof is provided with a second upper groove located directly above the second lower groove. The first lower groove, the first upper grooves, the second lower groove and the second upper groove are coaxially arranged with the corresponding straight flat rollers. The first lower groove and the second lower groove are U-shaped grooves matched with the lower part of the aluminum flat tube 1, and the width thereof is equal to the width of the aluminum flat tube 1 (with a small gap therebetween to facilitate sliding). The two first upper grooves are ring-shaped slits matched with the upper ends of the two arms of the aluminum flat tube 1, and the width thereof is equal to the thickness of the aluminum flat tube 1 (with a small gap therebetween to facilitate sliding). The upper ends of the two arms of the aluminum flat tube 1 are slidably arranged in the two first upper grooves, and the lower part thereof is slidably arranged in the first lower groove. The second upper groove is a ring-shaped slit matched with the upper part of the aluminum flat tube 1, and the left and right sides thereof are located outside the corresponding sides of the upper ends of the two arms of the aluminum flat tube 1, and the width thereof is equal to the thickness of the aluminum flat tube 1 (with a small gap therebetween to facilitate sliding). The upper part of the aluminum flat tube 1 is slidably arranged in the second upper groove, and the lower part thereof is slidably arranged in the second lower groove. Figure 2 The welding device 3 in the embodiment of the present application comprises a guide strip 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-rear direction, located adjacent to the front of the extrusion wheel assembly, sleeved on the outside of the aluminum flat tube 1 and arranged on the corresponding support. The guide strip 31 is arranged in the front-rear direction, most of which is located in front of the high-frequency coil 32, the rear end of which extends into the high-frequency coil 32, and the guide strip 31 is located between the upper ends of the two arms of the aluminum flat tube 1, the vertical height thereof is 2-5 mm, and the guide strip 31 is arranged on the corresponding support.

[0078] The extrusion wheel assembly comprises two welding units arranged side by side, and the two welding units are respectively located on the left and right sides of the aluminum flat tube 1. The welding unit comprises 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. The two mounting seats 33 are arranged side by side, which are rectangular blocks arranged in the front and back direction, 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. The bearing seat 34 is arranged at the lower part of the front side of the corresponding mounting seat 33, which is a rectangular box structure arranged in the front and back direction, and the inner side is flush with the inner side of the corresponding mounting seat 33. It is connected with the lubricating oil supply structure through the pipeline. The extrusion wheel shaft 35 is vertically arranged on the upper side of the bearing seat 34, and is rotatably arranged on the bearing seat 34. The inner coaxial cooling liquid channel (penetrating the extrusion wheel shaft 35) is arranged on the upper end of the extrusion wheel shaft 35, which is connected with the cooling liquid circulation structure through the bamboo joint pipe. The lower end of the extrusion wheel shaft 35 penetrates out of the bearing seat 34 and is open downward. The 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 on the lower part of the extrusion wheel shaft 35, which is located adjacent to the upper side of the bearing seat 34. The circumferential surface of the extrusion wheel 36 is provided with an arc-shaped groove matched with the aluminum flat tube 1. The two cooling metal plates 37 are respectively located on the left and right sides of the aluminum flat tube 1, and are respectively arranged on the inner side of the two mounting seats 33. They are arranged in the front and back direction, and have a gap between the corresponding side of the aluminum flat tube 1. The cooling metal plate 37 is located behind the two extrusion wheels 36. The cooling cavity is arranged in the cooling metal plate 37, and a plurality of spray holes are arranged on the front side of the cooling cavity. The top rear end of the cooling metal plate 37 is connected with the cooling liquid circulation structure through the pipeline (specifically, the bamboo joint pipe), which is arranged on the inner side of the front part of the corresponding mounting seat 33. The cooling metal plate 37 is a rectangular copper plate. The spray hole is arranged on the rear side of the corresponding extrusion wheel 36 and is communicated with the cooling cavity. The two first sponges 38 are respectively located on the left and right sides of the aluminum flat tube 1, which are located on the outer side of the corresponding cooling metal plate 37 and are located on the rear side of the corresponding extrusion wheel 36 and between 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, and is fixed on the inner side of the front end of the corresponding mounting seat 33. The lower end of the first sponge 38 is fixed on the bearing seat 34, which is used to seal the extrusion wheel 36 and the mounting seat 33 and wipe the extrusion wheel 36. The cooling liquid flowing out of the front end (specifically, the opening) of the cooling liquid groove 42 of the scrap removing device 4 flows between the two mounting seats 33. The cooling liquid flows out of the gap between the rear end of the two mounting seats 33 and between the extrusion wheel 36 and the bearing seat 34 (for cooling 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 cooling liquid between the two mounting seats 33. Specifically, the mounting seat 33, the extrusion wheel 36 and the first sponge 38 form a rear-opened H-shaped structure.

[0079] Wherein, see Figure 6The scrap removing device 4 in the embodiment of the present application comprises a shell 41, a cooling liquid tank 42, a feeding channel 43, two second sponge bodies 44, a scraper 45, a support structure 46, a cooling liquid nozzle 47, a sealing chamber 48, a discharging channel 49, one outer high-pressure nozzle, multiple inner high-pressure nozzles and two groups of side high-pressure nozzles, etc. The shell 41 is arranged along the front-rear direction, which is specifically a rectangular box structure, and both of its front and rear sides are provided with through holes for the aluminum flat tube 1 to pass through, and it is located above the cooling liquid circulating structure. The feeding channel 43 is arranged on the front side of the shell 41, which is arranged at the through hole on the front side of the shell 41, can be passed through by the aluminum flat tube 1, and is specifically a rectangular tube arranged along the front-rear direction. The cooling liquid tank 42 is arranged on the front side of the shell 41, which is arranged along the front-rear direction, and its front end upper side is provided with an opening (specifically a vertically arranged U-shaped opening, from which the cooling liquid flows out) for the aluminum flat tube 1 to pass through, and it contains cooling liquid, and its front end to the adjacent rear of the mounting seat 33 is connected with the cooling liquid circulating structure (outputs cooling liquid to the cooling liquid tank 42) through a pipeline, and its rear end is communicated with the front end of the feeding channel 43. Specifically, the cooling liquid tank 42 is a rectangular tank arranged along the front-rear direction, and its left and right sides and bottom are flush with the corresponding sides of the feeding channel 43, and its left or right side is connected with the cooling liquid circulating structure through a pipeline. The aluminum flat tube 1 is immersed in the cooling liquid in the cooling liquid tank 42. The two second sponge bodies 44 are respectively arranged on the left and right sides of the rear end of the feeding channel 43, which 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 feeding channel 43, which are specifically sponge strips arranged vertically, and their outer sides are fixed on the corresponding sides of the feeding channel 43, and their upper and lower ends are respectively fixed on the upper and lower sides of the feeding channel 43. The scraper 45 is located in the front part of the shell 41, which is located on the top of the aluminum flat tube 1, and is arranged obliquely from top to bottom and forward. The support sliding groove 46 is located in the front part of the shell 41, which is located directly below the scraper 45, is arranged along the front-rear direction, is located on the lower part of the aluminum flat tube 1, and is specifically a plastic rectangular groove (the aluminum flat tube 1 is slidingly arranged in the rectangular groove). The cooling liquid nozzle 47 is located in the front part of the shell 41, which is located beside the scraper 45, faces the scraped flat part on the top of the aluminum flat tube 1, and is connected with the cooling liquid circulating structure through a pipeline. The discharging channel 49 is arranged on the rear side of the shell 41, which is arranged at the through hole on the rear side of the shell 41, can be passed through by the aluminum flat tube 1, is specifically a rectangular tube arranged along the front-rear direction, and its lower side is arranged obliquely downward from rear to front to allow the blown down scraps and cooling liquid to flow into the shell 41. The sealing chamber 48 is located in the rear part of the shell 41, which is arranged at the front end of the discharging channel 49, and is provided with a strip-shaped hole (specifically a vertically arranged long circular hole, which is slightly larger than the aluminum flat tube 1) on its front side for the aluminum flat tube 1 to pass through, and is provided with a scrap discharge opening on its lower side, which is specifically a rectangular chamber arranged along the front-rear direction. The scrap discharge opening is a rectangular opening arranged along the front-rear direction, and a rectangular discharge pipe is arranged on it along the vertical direction to reduce the possibility of scraps splashing into the sealing chamber 48.

[0080] The cooling liquid circulation structure is used for collecting the cooling liquid output by the scrap removing device 4 and the welding device 3 and cooling and filtering, which can be arranged below the shell 41, and the cooling liquid is sent to the extrusion wheel shaft 35, the cooling metal plate 37, the cooling liquid tank 42 and the cooling liquid nozzle 47 by a pump.

[0081] At the welding device 3 and the scrap removing device 4, the aluminum flat tube 1 passes through the guide strip 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 feeding channel 43, the support chute 46, the outer high-pressure nozzle directly below, the sealing chamber 48 and the discharging channel 49 in sequence from front to back.

[0082] The shaping device in the embodiment of the present application comprises M shaping vertical roller pairs and N shaping horizontal roller pairs, M and N are integers greater than or equal to 2, and M-N≥2. Specifically, M is 6, and N is 3. The shaping vertical roller pairs and the shaping horizontal roller pairs are arranged alternately, and one or more shaping vertical roller pairs are arranged between two adjacent shaping horizontal roller pairs. The M shaping vertical roller pairs and the N shaping horizontal roller pairs are arranged in sequence from front to back. Each shaping vertical roller pair comprises two shaping vertical rollers arranged side by side and located on the left and right sides of the aluminum flat tube 1 respectively. The shaping vertical rollers are arranged vertically, and a cleaning sponge (vertically arranged on a corresponding support and used for wiping the shaping vertical rollers) is arranged on the outer side of each shaping vertical roller. The cleaning sponge can ensure the cleanliness of the shaping vertical rollers, thereby ensuring the accuracy of shaping. Each shaping horizontal roller pair comprises two shaping horizontal rollers arranged side by side and located on the upper and lower sides of the aluminum flat tube 1 respectively. The two shaping horizontal rollers are synchronously driven (specifically by two synchronously driven universal shafts) and arranged in the left-right direction. The roller surface of the shaping vertical roller of the front (for example, two shaping vertical rollers in the front) shaping vertical roller pair is provided with a circular groove coaxially, the roller surface of the shaping vertical roller of the middle (for example, three shaping vertical rollers in the front) shaping vertical roller pair is not provided with a groove, and the roller surface of the shaping vertical roller of the rear (for example, one shaping vertical roller in the rear) shaping vertical roller pair is provided with a rectangular groove coaxially.

[0083] In the embodiment of the present application, the aluminum flat tube 1 is shaped by the shaping device, and then the shaped aluminum flat tube 1 is conveyed to the welding device 3 and the scrap removing device 4. Figures 7-8The fine adjustment device in the embodiment of the present application comprises, from front to back, left-right fine adjustment structure, eddy current flaw detection structure, length counting structure, and vertical fine adjustment structure. The eddy current flaw detection structure and the length counting structure are consistent with the prior art. The left-right fine adjustment structure comprises two horizontal fine adjustment units arranged side by side and respectively located on the left and right sides of the aluminum flat tube 1. The horizontal fine adjustment unit comprises a first adjustment seat arranged in the front-rear direction and two fine adjustment vertical rollers arranged side by side in the front-rear direction inside the first adjustment seat. The first adjustment seat is specifically a rectangular plate arranged in the front-rear direction. The fine adjustment vertical roller is vertically arranged and abuts against the corresponding side (left or right side) of the aluminum flat tube 1. The roller surface is smooth, and the fine adjustment vertical roller can be adjusted in the left-right direction (the minimum distance of fine adjustment is 0.01 mm) on the first adjustment seat. The four fine adjustment vertical rollers on the left and right sides are arranged alternately in the front-rear direction. The vertical fine adjustment structure comprises a second adjustment seat arranged in the front-rear direction and a plurality of pairs of vertical fine adjustment wheel pairs arranged side by side in the front-rear direction on the second adjustment seat. The second adjustment seat is specifically a rectangular plate arranged in the vertical direction. The vertical fine adjustment wheel pair comprises two fine adjustment discs arranged side by side in the up-down direction and driven synchronously. The two fine adjustment discs are respectively located on the upper and lower sides of the aluminum flat tube 1 and abut against each other. The coaxial grooves (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) are arranged on the circumferential surface of the fine adjustment disc. The upper and lower parts of the aluminum flat tube 1 are respectively located in the grooves of the two fine adjustment discs. The fine adjustment disc is arranged in the left-right direction on the sliding block (specifically a rectangular block). A plurality of strip-shaped openings are arranged side by side in the front-rear direction on the second adjustment seat. The strip-shaped openings are vertically arranged. The two sliding blocks of the same vertical fine adjustment wheel pair are arranged in the same strip-shaped opening and can be adjusted in the vertical direction (the minimum distance of fine adjustment is 0.01 mm).

[0084] Embodiment 3

[0085] Embodiment 3 provides a production line for parallel flow aluminum flat tubes. The structure is basically the same as that of embodiment 2, except that a plurality of structures can be adjusted and replaced in order to produce a plurality of specifications of products. The high-frequency coil 32 in the embodiment of the present application is arranged on the adjustment arm and can be adjusted in the vertical and left-right directions. The guide bar 31 can be adjusted in the front-rear and vertical directions. The mounting seat 33 can be adjusted in the left-right direction. The scraper 45 can be adjusted in the left-right and vertical directions. The support sliding groove 46 can be adjusted in the vertical direction. The shaping vertical roller can be adjusted in the left-right direction. The shaping horizontal roller can be adjusted in the vertical direction.

[0086] Embodiment 4

[0087] Referring to Figures 1-8 Embodiment 4 provides a production method for parallel flow aluminum flat tubes. The production line disclosed in embodiment 1 or 2 is adopted. The method comprises, in sequence, a pay-off process, a straightening process, a pre-forming process, a weld straightening process, a welding process, a cooling and cleaning process, a chip removal process, a shaping process, a fine adjustment process, and a cutting process. The pay-off process, the straightening process, the pre-forming process, the welding process, the chip removal process, the shaping process, and the cutting process are similar to the prior art.

[0088] The pre-forming process gradually bends the aluminum strip into a U-shaped structure that matches the shape of the aluminum flat tube 1.

[0089] The 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.

[0090] 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 rear part of the extrusion wheel 36 is cooled and cleaned by the cooling liquid sprayed by the cooling metal plate 37 inside the mounting seat 33. The cooling liquid is introduced into the extrusion wheel shaft 35 to cool the extrusion wheel shaft 35 and the extrusion wheel 36.

[0091] The cooling and cleaning process is to pass the aluminum flat tube 1 through the cooling liquid between the two mounting seats 33 of the welding device 3 and the cooling liquid in the cooling liquid tank 42 at the front end of the scrap removal device 4. The cooling liquid in the cooling liquid tank 42 flows out from the front end to the gap between the two mounting seats 33, and the rear end is provided with two second sponges 44 to seal it and scrub and dry the two sides of the aluminum flat tube 1. The cooling liquid between the two mounting seats 33 flows out from the gap between the rear end of the two mounting seats 33 and the bearing seat 34 and the extrusion wheel 36. The cooling and cleaning process is used to ensure the accuracy of the scrap removal process. The cooling and cleaning process is realized on the welding device 3 and the scrap removal device 4.

[0092] The scrap removal process includes a scraping process and a high-pressure blowing process. In the scraping process, cooling liquid is sprayed at the scraping position of the scraper 45. The high-pressure blowing process includes sequentially blowing the aluminum flat tube 1 vertically downward by the outer high-pressure nozzle, blowing the aluminum flat tube 1 vertically downward by the inner high-pressure nozzle, and blowing the two sides of the aluminum flat tube 1 by the 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.

[0093] The fine adjustment process first adjusts the aluminum flat tube 1 in the left-right direction, and then adjusts the aluminum flat tube 1 in the vertical direction, to ensure the accuracy of the cutting process.

[0094] The results of the aluminum flat tube (material 3003 aluminum alloy, length 1069.6 mm) prepared by the method of the present application are as follows:

[0095] Table 1

[0096]

[0097] The pressure resistance of the commercially available product 1 is about 5Mpa, and the pressure resistance of the commercially available product 2 is 11-12Mpa. The pressure resistance is obviously improved.

[0098] Wherein, the "first" and "second" of the present patent only play a distinguishing role, and have no other special meaning.

[0099] The above merely provides the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A production line for parallel-flow aluminum flat tubes, characterized in that, It includes, from front to back, 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; The unwinding device is used to output 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) includes a guide bar (31), a high-frequency coil (32), and an extrusion wheel assembly arranged sequentially from front to back; The high-frequency coil (32) is arranged in the front-back direction and is located adjacent to the front of the extrusion roller assembly. It is sleeved on the aluminum flat tube (1). The guide strip (31) is arranged in the front-back direction 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). The extrusion wheel assembly includes two welding units arranged side by side. Each welding unit includes a mounting base (33), a bearing seat (34) at the inner front end of the mounting base (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 in the front-rear direction on the inner side of the mounting base (33), and a first sponge (38) between the front end of the mounting base (33) and the extrusion wheel (36). The two mounting bases (33) are arranged side by side, and the two extrusion wheels (36) are located on the left and right sides of the aluminum flat tube (1), respectively. A coolant channel is coaxially provided inside the extrusion wheel shaft (35), and the upper end of the coolant channel is connected to the coolant circulation structure through a pipe. The two cooling metal plates (37) are located on the left and right sides of the aluminum flat tube (1), respectively, and are located directly behind the two extrusion wheels (36). The cooling metal plate (37) is provided with a cooling chamber, and multiple spray holes are arranged side by side on its front side. Its top and rear end are connected to the coolant circulation structure through a pipeline. The spray holes are set towards the rear of the corresponding extrusion wheel (36). The feed inlet of the scraper (4) is provided with a coolant tank (42). The coolant tank (42) is filled with coolant, and two second sponges (44) are provided at its rear end for sealing and wiping the sides of the aluminum flat tube (1). The coolant flowing out from the front end of the coolant tank (42) is between the two mounting seats (33). 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). 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). The welding device (3) is used to first heat the aluminum flat tube (1) at high frequency, and then perform extrusion welding through two extrusion rollers (36); coolant is introduced into the extrusion roller shaft (35) of the extrusion roller (36), and the cooling metal plate (37) directly behind the extrusion roller (36) sprays coolant onto the rear of the extrusion roller (36), and the coolant flowing out of the scraper (4) cools the extrusion roller (36) and the bearing seat (34); a first sponge (38) is provided between the extrusion roller (36) and the mounting seat (33) to seal the extrusion roller (36) and the mounting seat (33) and to wipe the extrusion roller (36); The scraping device (4) is used to flatten the top of the aluminum flat tube (1) by scraping with a scraper (45); 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 products to a predetermined length.

2. The production line for parallel flow aluminum flat tubes according to claim 1, characterized in that, The weld straightening device (2) includes a front flat roller pair (21), a vertical roller pair (22), and a rear flat roller pair (23) arranged sequentially from front to back; the front flat roller pair (21) and the rear flat roller pair (23) are driven synchronously, each including two straightening flat rollers arranged side by side and located on the upper and lower sides of the aluminum flat tube (1); the straightening flat rollers are arranged in the left and right direction; The vertical roller pair (22) includes two relatively straight vertical rollers arranged side by side on the left and right sides of the aluminum flat tube (1), respectively. The relatively straight vertical rollers are arranged vertically and have an arc groove coaxially arranged in the middle to cooperate with the aluminum flat tube (1). The front flat roller pair (21) has a first lower groove on the lower straight flat roller and two first upper grooves arranged side by side on the upper straight flat roller. The rear flat roller pair (23) has a second lower groove on the lower straight flat roller and a second upper groove on the upper straight flat roller. The first lower groove, the first upper groove, the second lower groove, and the second upper groove are coaxially arranged with the corresponding straight flat roller. The first lower groove and the second lower groove are both U-shaped grooves that fit 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 fit with the upper ends of the two arms of the aluminum flat tube (1) respectively. They are annular strips with a width equal to the thickness of the aluminum strip. The upper ends of the two arms of the aluminum flat tube (1) are slidably disposed in the two first upper grooves and their lower parts are slidably disposed in the first lower groove. The second upper groove is fitted with the upper part of the aluminum flat tube (1), and its left and right sides are respectively located on the outer side of the corresponding side of the upper end of the two arms of the aluminum flat tube (1). It is an annular strip with the same width as the thickness of the aluminum flat tube (1). The upper part of the aluminum flat tube (1) is slidably disposed in the second upper groove, and its lower part is slidably disposed in the second lower groove.

3. The production line for parallel flow aluminum flat tubes according to claim 2, characterized in that, The scraping device (4) includes a housing (41) arranged in the front-rear direction, a coolant tank (42) on the front side of the housing (41), a feed channel (43) on the front side of the housing (41), two second sponges (44) on the left and right sides of the rear end of the feed channel (43), a scraper (45) inside the housing (41) and located at the top of the aluminum flat tube (1), a support groove (46) inside the housing (41) and located directly below the scraper (45), and a coolant nozzle (47) inside the housing (41) and located next to the scraper (45). The discharge channel (49) on the rear side of the housing (41), the sealing chamber (48) at the front end of the discharge channel (49), the external high-pressure nozzle between the scraper (45) and the sealing chamber (48), the internal high-pressure nozzle in the sealing chamber (48) and the two sets of side high-pressure nozzles on the left and right sides of the discharge channel (49), the support slide (46) is arranged in the front and back direction and is located at the lower part of the aluminum flat tube (1), the coolant nozzle (47) faces the scraping part at the top of the aluminum flat tube (1) and is connected to the coolant circulation structure through the pipeline; Two sets of side high-pressure nozzles are located on the left and right sides of the aluminum flat tube (1), respectively. The external high-pressure nozzle and the internal high-pressure nozzle are both located directly above the aluminum flat tube (1). The side high-pressure nozzle, the external high-pressure nozzle, and the internal high-pressure nozzle are all connected to the compressed air supply structure through pipelines and are all oriented towards the aluminum flat tube (1). The upper front end of the coolant tank (42) is provided with an opening for the aluminum flat tube (1) to pass through. Its front end is located adjacent to the rear of the welding device (3). It is connected to the coolant circulation structure through pipelines, and its rear end is connected to the feed channel. (43) is connected to the front end; 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 closely attached to each other, located on the left and right sides of the aluminum flat tube (1) respectively, 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 discharge port; the coolant circulation structure is used to collect the coolant output by the chip scraper (4) and the welding device (3) and cool and filter it.

4. The production line for parallel flow aluminum flat tubes according to claim 3, characterized in that, The fine-tuning device includes a left-right fine-tuning structure, an eddy current flaw detection structure, a length counting structure, and a vertical fine-tuning structure arranged sequentially from front to back. The left-right fine-tuning structure includes two horizontal fine-tuning units arranged side by side on the left and right sides of the aluminum flat tube (1), and the horizontal fine-tuning unit includes a first adjusting seat arranged in the front-back direction and two fine-tuning vertical rollers arranged side by side on its inner side; the fine-tuning vertical rollers are arranged vertically, and their tops rest against the corresponding side of the aluminum flat tube (1), and their roller surfaces are smooth. They are arranged on the first adjusting seat in a left-right fine-tuning manner; a total of four fine-tuning vertical rollers on the left and right sides are arranged alternately in front and behind. The vertical fine-tuning structure includes a second adjustment seat arranged in the front-to-back direction and multiple pairs of vertical fine-tuning wheels arranged side-by-side on it; each pair of vertical fine-tuning wheels includes two fine-tuning discs arranged side-by-side and driven synchronously; the two fine-tuning discs are located on the upper and lower sides of the aluminum flat tube (1) respectively, their tops abutting each other, and their circumferential surfaces are coaxially provided with grooves that fit 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 discs; the fine-tuning discs are arranged in the left-to-right direction and are located on the sliders; the second adjustment seat has multiple strip-shaped openings arranged side-by-side in the front-to-back direction, and the strip-shaped openings are arranged vertically; the two sliders of the same vertical fine-tuning wheel pair are slidably arranged in the same strip-shaped opening and can be vertically fine-tuned.

5. The production line for parallel flow aluminum flat tubes according to claim 4, characterized in that, The shaping device includes M vertical roller shaping pairs and N horizontal roller shaping pairs, where M and N are integers greater than or equal to 2, and MN≥2; the vertical roller shaping pairs and horizontal roller shaping pairs are arranged alternately, and each vertical roller shaping pair includes two shaping vertical rollers arranged side by side on the left and right sides of the aluminum flat tube (1); the shaping vertical rollers are arranged vertically, and a cleaning sponge is attached to their outer side; the horizontal roller shaping pairs include two shaping horizontal rollers arranged side by side on the top and bottom sides of the aluminum flat tube (1); the shaping horizontal rollers are arranged in the left and right direction; the shaping vertical rollers of the front vertical roller shaping pair have coaxial arc grooves on their roller surfaces, the shaping vertical rollers of the middle vertical roller shaping pair do not have grooves on their roller surfaces, and the shaping vertical rollers of the rear vertical roller shaping pair have coaxial rectangular grooves on their roller surfaces; The cutting device is a flying shear cutting device.

6. The production line for parallel flow aluminum flat tubes according to claim 5, characterized in that, The high-frequency coil (32) is mounted on the adjusting arm and can be adjusted vertically and horizontally; the guide bar (31) can be adjusted forward and backward and vertically; the mounting base (33) can be adjusted horizontally; the scraper (45) can be adjusted horizontally and vertically; the support groove (46) can be adjusted vertically; the shaping vertical roller can be adjusted horizontally; and the shaping flat roller can be adjusted vertically.

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