Extrusion welding device for aluminum flat tubes

Abstract

The invention discloses an extrusion welding device for aluminum flat tubes, belonging to the technical field of aluminum flat tubes. It includes a weld straightening component, a guiding component, a high-frequency coil and an extrusion wheel component. The extrusion wheel component includes two mounting seats, a bearing seat, an extrusion wheel shaft, an extrusion wheel, a cooling metal plate and a first soft body; a coolant tank is provided at the feed inlet of the chip scraping device, and two cooling metal plates are respectively arranged on the two mounting seats, and are respectively located directly behind the two extrusion wheels; spray holes are provided on the front side of the cooling metal plate, which are connected to the coolant circulation structure; the coolant tank is connected to the coolant circulation structure, and the coolant overflowing from the front end thereof reaches between the two mounting seats; two first soft bodies are respectively located on the left and right sides of the aluminum flat tube, and are located between the rear outer side of the corresponding extrusion wheel and the mounting seat; the mounting seats, the extrusion wheels and the first soft bodies enclose a U-shaped structure; the coolant between the two mounting seats flows out from the open end of the U-shaped structure and the gap between the extrusion wheel and the bearing seat.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum flat tube processing, and in particular relates to an extrusion welding device for aluminum flat tubes. Background Art

[0002] Aluminum alloy flat tubes are important heat dissipation components in automotive radiators and air conditioner condensers. They offer a large internal cross-sectional area, excellent heat transfer, and possess advantages such as superior thermal conductivity, corrosion resistance, high recyclability, high surface quality, light weight, and high compressive strength. Due to the required wall thickness of the flat tubes being between 0.25mm and 0.5mm, conventional methods typically involve bending aluminum strips into a U-shape, followed by high-frequency heating and extrusion welding.

[0003] For example, the patent application number CN201710135680.1 discloses a high-frequency welding pipe making machine, which includes an uncoiling unit, a splicing unit, a storage unit, a traction unit, an area 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 uncoiling 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 provided on the upper part of the protective frame at the discharging end, the guide wheel I and the guide wheel II are provided at the discharging end of the guide plate, and the guide wheel III slides up and down under the guide wheel I and the guide wheel II.

[0004] For example, the patent 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 for installing the components required for the aluminum heat pipe production line, wherein the side and top are provided with wires connecting the components; an unwinding assembly, installed on one side of the top of the machine, 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, 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 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 dissipation tube; 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 welds and surface dust of the blank aluminum heat dissipation tube; 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 dissipation tube; 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 dissipation tube; 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 dissipation tube according to the preset length.

[0005] From the above patents, we can see that the production of aluminum flat tubes will use extrusion welding devices and scraping devices. Among them, the extrusion welding device includes a workbench and a weld straightening component, a guide component, a high-frequency coil and an extrusion wheel component arranged on it from front to back. The extrusion wheel component includes two welding units arranged side by side on the left and right. The welding unit includes a mounting seat, a bearing seat on the mounting seat, an extrusion wheel shaft on the bearing seat and an extrusion wheel on the extrusion wheel shaft. The two mounting seats are arranged side by side on the left and right and are arranged on the workbench. The two extrusion wheels are respectively located on the left and right sides of the aluminum flat tube. A coolant channel is provided on the extrusion wheel shaft, and the coolant channel is connected to the coolant circulation structure through a pipeline.

[0006] For example, patent application number CN201720224484.7 discloses a pipe extrusion welding device comprising a base, a guide wheel assembly, and a welding wheel assembly, the guide wheel assembly and the welding wheel assembly being sequentially mounted on the base. There are two or more guide wheel assemblies, each comprising a bearing seat I, a guide wheel, and a guide wheel shaft. Bearing seat I is mounted on the base, and the guide wheel is rotatably connected to the top of bearing seat I via the guide wheel shaft. The welding wheel assembly comprises a bearing seat II, a welding wheel, and a welding wheel shaft, the welding wheel being rotatably connected to the bottom of bearing seat II via the welding wheel shaft, and bearing seat II is supported on the base via column I. A cooling water channel is provided within the welding wheel shaft, running longitudinally through both ends of the shaft, with rotary joints provided at both ends for connecting to cooling water pipes. The device also includes a material guide assembly, which is arranged on the column II between the guide wheel assembly and the welding wheel assembly. The material guide assembly includes a material guide bar, a guide bar mounting seat and a height adjustment block. The material guide bar is arranged on the guide bar mounting seat, the guide bar mounting seat is arranged on the height adjustment block, and the height adjustment block is arranged on the column II.

[0007] For example, patent application number CN201520834005.4 discloses a high-frequency welding extrusion device for heat-dissipating aluminum tubes. The device comprises two extrusion wheels and two rotating shafts. The extrusion wheels are tightly fitted to the lower portion of the rotating shafts. The upper portion of each rotating shaft is provided with a bearing seat. The bearing seat is provided with a lubricant channel and an interface for lubricating the bearings. The bearing seat is provided with a bearing sleeved on the rotating shaft. The rotating shaft is provided with a cooling water channel that longitudinally runs through both ends of the rotating shaft. The upper and lower ends of the rotating shaft are provided with a locking nut and a cooling water pipe.

[0008] The prior art heats an aluminum flat tube using a high-frequency coil, melting the upper ends of the two arms of the U-shaped tube. An extrusion wheel then presses the upper ends of the two arms together to weld and simultaneously form the tube. The heated aluminum flat tube reaches a high temperature, which transfers heat to the extrusion wheel, causing deformation and affecting welding and forming accuracy. This also shortens the wheel's service life. The prior art cools the extrusion wheel shaft and wheels by injecting coolant into the wheel shaft. The applicant has found that this cooling effect is ineffective. Furthermore, the high temperature of the aluminum flat tube itself affects the accuracy of the subsequent scraping process and the service life of the scraper. Summary of the Invention

[0009] In order to solve the above problems, the embodiment of the present invention provides an extrusion welding device for aluminum flat tubes, which has a good cooling effect on the extrusion wheel and the aluminum flat tube, and also realizes the cleaning of the aluminum flat tube and the extrusion wheel. The technical solution is as follows:

[0010] An extrusion welding device for aluminum flat tubes provided by an embodiment of the present invention includes a workbench 1 and a weld straightening component 2, a guiding component 3, a high-frequency coil 4, and an extrusion wheel component 5 sequentially arranged from front to back thereon. The extrusion wheel component 5 includes two welding units arranged side by side left and right. Each welding unit includes a mounting seat 51, a bearing seat 52 on the mounting seat 51, an extrusion wheel shaft 53 on the bearing seat 52, and an extrusion wheel 54 on the extrusion wheel shaft 53. The two mounting seats 51 are arranged side by side left and right and are disposed on the workbench 1. The two extrusion wheels 54 are respectively located on the left and right sides of the aluminum flat tube 6. A coolant channel is provided on the extrusion wheel shaft 53, and the coolant channel is connected to a coolant circulation structure through a pipeline; a coolant tank 8 is provided at the feed inlet of a chip scraping device 7 behind the extrusion welding device. The welding unit further includes a cooling metal plate 9 and a first soft body 10; the two cooling metal plates 9 are respectively located on the left and right sides of the aluminum flat tube 6, are respectively disposed on the two mounting seats 51, are both arranged along the front-back direction, and are respectively located directly behind the two extrusion wheels 54; a cooling cavity is provided in the cooling metal plate 9, a plurality of spray holes are arranged side by side up and down on the front side thereof, and it is connected to the coolant circulation structure through a pipeline; the spray holes are arranged towards the rear side of the corresponding extrusion wheel 54 and are communicated with the cooling cavity; the coolant tank 8 is connected to the coolant circulation structure through a pipeline, an opening for the aluminum flat tube 6 to pass through is provided in the upper part of the front side thereof, the front end thereof is located adjacent to the rear of the mounting seat 51, and the coolant overflowing from the front end reaches between the two mounting seats 51; the two first soft bodies 10 are respectively located on the left and right sides of the aluminum flat tube 6, and are located between the rear outer side of the corresponding extrusion wheel 54 and the mounting seat 51 to seal between the extrusion wheel 54 and the mounting seat 51; the mounting seat 51, the extrusion wheel 54, and the first soft body 10 enclose a backward-opening U-shaped structure; the coolant between the two mounting seats 51 flows out from the opening of the U-shaped structure and the gap between the extrusion wheel 54 and the bearing seat 52.

[0011] Among them, the coolant circulation structure in the embodiment of the present invention is located directly below the workbench 1; a through hole is provided on the workbench 1 and below the extrusion wheel 54 and is communicated with the coolant circulation structure, and a groove 11 is provided on it and directly below the front end of the coolant tank 9; the groove 11 is arranged along the left-right direction, is located adjacent to the rear of the mounting seat 51, and is communicated with the coolant circulation structure.

[0012] Among them, the coolant tank 8 in the embodiment of the present invention is a rectangular tank arranged along the front-back direction, and its left or right side is connected to the coolant circulation structure through a pipeline with a pump, and two second soft bodies are provided at the rear end thereof, and it contains coolant; the two second soft bodies are respectively located on the left and right sides of the aluminum flat tube 6, are arranged side by side left and right and are closely adhered together, and seal the rear end of the coolant tank 8; the aluminum flat tube 6 is immersed in the coolant between the two mounting seats 51 and in the coolant tank 8; the opening is a vertically arranged U-shaped opening.

[0013] Among them, the mounting seat 51 in the embodiment of the present invention is a rectangular block arranged along the front-to-back direction, which can be adjusted left and right on the workbench 1; the cooling metal plate 9 is arranged at the inner front part of the corresponding mounting seat 51; the bearing seat 52 is arranged at the lower part of the inner end of the front side of the corresponding mounting seat 51, which is a rectangular box structure arranged along the front-to-back direction, and its inner side is flush with the inner side of the mounting seat 51 on the corresponding side, and it is connected to the lubricating oil supply structure through a pipeline.

[0014] Among them, the cooling metal plate 9 in the embodiment of the present invention is a rectangular copper plate, and the rear part of its upper side is connected to the coolant circulation structure through a universal bamboo tube; the extrusion wheel 54 is coaxially arranged at the lower part of the extrusion wheel shaft 53 and is located adjacent to and above the bearing seat 52; the extrusion wheel shaft 53 is vertically arranged on the upper side of the bearing seat 52, and it is rotatably arranged on the bearing seat 52, its upper end is connected to the coolant circulation structure through the bamboo tube, and its lower end passes through the bearing seat 52 downward and is open; the coolant channel is coaxially arranged with the extrusion wheel shaft 53.

[0015] Among them, the high-frequency coil 4 in the embodiment of the present invention is arranged in the front-to-back direction, is located adjacent to the front of the extrusion wheel 54, and is sleeved on the outside of the aluminum flat tube 6; the guide assembly 3 includes an adjustment seat and a guide bar arranged on its upper edge in the front-to-back direction; the adjustment seat can be adjusted left and right on the workbench 1, and is located on the left or right side of the aluminum flat tube 6; the guide bar is arranged in the front-to-back direction, is located in front of the high-frequency coil 4, and its rear end extends into the high-frequency coil 4. It can be adjusted front-to-back and vertically on the adjustment seat, and is located between the upper ends of the two arms of the aluminum flat tube 6.

[0016] Specifically, the first soft body 10 and the second soft body in the embodiment of the present invention are both vertically arranged sponge strips; the first soft body 10 is located in front of the corresponding cooling metal plate 9, which is fixed to the inner front end of the corresponding mounting seat 51, and its lower end is fixed on the bearing seat 52.

[0017] Among them, the weld straightening component 2 in the embodiment of the present invention includes a front flat roller unit 21, a vertical roller unit 22 and a rear flat roller unit 23 arranged in sequence from front to back; the front flat roller unit 21 and the rear flat roller unit 23 are driven synchronously, and each includes two flat rollers arranged side by side in an upper and lower manner and located on the upper and lower sides of the aluminum flat tube 6 respectively; the vertical roller unit 22 includes two vertical rollers arranged side by side in a left and right manner and located on the left and right sides of the aluminum flat tube 6 respectively, the vertical rollers are arranged vertically and the middle part thereof is coaxially provided with an annular groove that cooperates with the aluminum flat tube 6; the lower flat roller and the upper flat roller of the front flat roller unit 21 are respectively provided with a first lower groove and two first upper grooves, and the lower flat roller and The upper flat rollers are respectively provided with a second lower groove 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 flat rollers. The first lower groove and the second lower groove both cooperate with the lower part of the aluminum flat tube 6 and allow the lower part of the aluminum flat tube 6 to slide through. The two first upper grooves are arranged side by side on the left and right and respectively cooperate with the upper ends of the two arms of the aluminum flat tube 6. The upper ends of the two arms of the aluminum flat tube 6 are respectively slid in the two first upper grooves; the second upper groove cooperates with the upper part of the aluminum flat tube 6, and its left and right sides are respectively located on the outside of the corresponding sides of the upper ends of the two arms of the aluminum flat tube 6; the upper part of the aluminum flat tube 6 is slid in the second upper groove.

[0018] Specifically, the annular groove in the embodiment of the present invention is an arc-shaped groove, the first lower groove and the second lower groove are U-shaped grooves, the first upper groove and the second upper groove are annular slits, the width of the second upper groove is the same as the thickness of the aluminum flat tube 6, and the width of the first upper groove is the same as the thickness of the aluminum strip constituting the aluminum flat tube 6.

[0019] Preferably, a negative pressure pipe is provided above between the two cooling metal plates 9 in the embodiment of the present invention, and the suction port of the negative pressure pipe is arranged forward and toward the extrusion wheel 54 .

[0020] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0021] (1) The coolant in the coolant tank and the U-shaped structure realizes the cooling and cleaning of the aluminum flat tube and the extrusion wheel, and the temperature of the scraping process is less than 50°C.

[0022] (2) The cooling metal plate realizes the cooling of the coolant in the U-shaped structure, and the sprayed coolant realizes the cooling and cleaning of the extrusion wheel.

[0023] (3) The coolant flowing out from the front gap of the U-shaped structure realizes the cooling of the bearing seat and the extrusion wheel.

[0024] (4) The guide assembly has three functions: one is to guide, the second is to prevent deformation during heating (especially inward deformation), and the third is to seal the upper end of the aluminum flat tube to prevent impurities and coolant from entering.

[0025] (5) The straight weld assembly realizes the shaping and straightening of the upper ends of the two arms of the aluminum flat tube to ensure the welding effect.

[0026] (6) The negative pressure pipe absorbs the heat and dust from the extrusion wheel in time to ensure the welding effect.

[0027] (7) The processing speed of the aluminum flat tube of this patent is greater than 130m / min. Compared with the existing technology, the compressive strength of the aluminum flat tube is increased by at least 15%, and the welding size error of the aluminum flat tube is less than 0.02mm. Figure 5 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

[0028] Figure 1 Schematic diagram of the structure of the extrusion welding device for aluminum flat tubes in an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the flat roller on the upper part of the front flat roller unit;

[0030] Figure 3 It is a structural diagram of the vertical roller;

[0031] Figure 4 It is a schematic diagram of the structure of the flat roller on the upper part of the rear flat roller unit;

[0032] Figure 5 This is a schematic diagram of the appearance of the welded end of the aluminum flat tube prepared in this patent.

[0033] In the figure: 1 workbench, 2 weld straightening assembly, 3 guide assembly, 4 high-frequency coil, 5 extrusion wheel assembly, 6 aluminum flat tube, 7 scraper device, 8 coolant tank, 9 cooling metal plate, 10 first soft body, 11 groove;

[0034] 21 front flat roller unit, 22 vertical roller unit, 23 rear flat roller unit;

[0035] 51 mounting seat, 52 bearing seat, 53 extrusion wheel shaft, 54 extrusion wheel. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] See also Figure 1, Example 1 provides an extrusion welding device for aluminum flat tubes, which includes a workbench 1 and a weld straightening component 2, a guide component 3, a high-frequency coil 4, and an extrusion wheel component 5 arranged thereon in sequence from front to back. A cooling liquid tank 8 is provided on the feed port of the scraping device 7 at the rear of the extrusion welding device. The cooling liquid tank 8 is connected to the cooling liquid circulation structure (which outputs cooling liquid to the cooling liquid tank 8) through a pipeline. The upper front part of the cooling liquid tank 8 is provided with an opening (specifically, a vertically arranged U-shaped opening) for the aluminum flat tube 6 to pass through. The front end of the cooling liquid tank 8 is located adjacent to the rear of the mounting seat 51, and the cooling liquid overflowing from the front end is discharged between the two mounting seats 51. Specifically, the cooling liquid tank 8 is a rectangular tank arranged in the front-to-back direction. The left or right side of the cooling liquid tank 8 is connected to the cooling liquid circulation structure through a pipeline with a pump. The rear end of the cooling liquid tank 8 is provided with two second soft bodies (specifically, vertically arranged sponge strips), which are filled with cooling liquid. Two second soft bodies are positioned on either side of the aluminum flat tube 6, side by side and tightly attached (the center deforms to form a groove for the tube 6 to pass through), sealing the rear end of the coolant tank 8. The weld straightening assembly 2 guides the aluminum flat tube 6 and straightens the upper ends of its two arms to ensure a good weld.

[0039] The guide assembly 3 includes an adjustment seat and a guide bar disposed along its upper edge in the front-to-back direction. The adjustment seat is disposed on the workbench 1 so as to be adjustable left and right, and is located on the left or right side of the aluminum flat tube 6. The guide bar is disposed in the front-to-back direction, located in front of the high-frequency coil 4, with its rear end extending into the high-frequency coil 4. It can be adjusted both front-to-back and vertically on the adjustment seat. It is located between the upper ends of the two arms of the aluminum flat tube 6 and is specifically a copper bar. The guide assembly 3 has three functions: first, guidance; second, preventing deformation during heating; and third, sealing the upper end of the aluminum flat tube 6 to prevent the ingress of impurities and coolant.

[0040] The high-frequency coil 4 is arranged in the front-to-back direction, is located adjacent to and in front of the extrusion wheel 54 , is sleeved outside the aluminum flat tube 6 , and can be adjusted vertically and left-right.

[0041] The extrusion wheel assembly 5 includes two welding units arranged side by side, one on each side of the aluminum flat tube 6. The welding units include a mounting seat 51, a bearing seat 52, an extrusion wheel shaft 53, an extrusion wheel 54, a cooling metal plate 9, and a first soft body 10.

[0042] Among them, two mounting seats 51 are arranged side by side on the left and right sides, and are arranged on the workbench 1. The mounting seats 51 are rectangular blocks arranged along the front-back direction, and can be adjusted left and right on the workbench 1.

[0043] The two bearing seats 52 are arranged side by side. The bearing seats 52 are located at the lower part of the inner end of the front side of the corresponding mounting seat 51. They are rectangular box structures arranged in the front-to-back direction. The inner side of the bearing seats 52 is flush with the inner side of the corresponding mounting seat 51. The bearing seats 52 are connected to the lubricating oil supply structure through pipelines.

[0044] Among them, the extrusion wheel shaft 53 is vertically arranged above the bearing seat 52, rotatably arranged on the bearing seat 52, and a coolant channel (penetrating through the extrusion wheel shaft 53) is coaxially arranged inside it. Its upper end (specifically, the upper end of the coolant channel) is connected to a coolant circulation structure (for outputting coolant to the extrusion wheel shaft 53) through a bamboo joint pipe, and its lower end penetrates downward through the bearing seat 52 and is open.

[0045] Among them, two extrusion wheels 54 are arranged side by side left and right and are respectively located on the left and right sides of the aluminum flat tube 6. The extrusion wheels 54 are coaxially arranged at the lower part of the extrusion wheel shaft 53, located adjacent above the bearing seat 52, and grooves for cooperating with the aluminum flat tube 6 are arranged on their circumferential surfaces. Their material is wear-resistant alloy.

[0046] Among them, two cooling metal plates 9 are respectively located on the left and right sides of the aluminum flat tube 6, with a gap between their corresponding sides and the aluminum flat tube 6. They are respectively arranged on two mounting seats 51, both are arranged along the front-back direction, and are respectively located directly behind the two extrusion wheels 54. A cooling cavity is arranged inside the cooling metal plate 9, and a plurality of spray holes are arranged side by side up and down on its front side. It is arranged at the front part inside the corresponding mounting seat 51, is a rectangular copper plate, and its upper rear part (communicating with the cooling cavity) is connected to a coolant circulation structure (outputting coolant to the cooling metal plate 9) through a universal bamboo joint pipe. The spray holes are arranged towards the rear side of the corresponding extrusion wheel 54 and are communicated with the cooling cavity.

[0047] Among them, two first soft bodies 10 are respectively located on the left and right sides of the aluminum flat tube 6, located between the rear outer side of the corresponding extrusion wheel 54 and the mounting seat 51 to seal between the extrusion wheel 54 and the mounting seat 51. Specifically, the first soft body 10 is a vertically arranged sponge strip, located in front of the corresponding cooling metal plate 9, fixed at the front end inside the corresponding mounting seat 51, and its lower end is fixed on the bearing seat 52.

[0048] Among them, the mounting seat 51, the extrusion wheel 54 and the first soft body 10 enclose a U-shaped structure with an open rear. The coolant between the two mounting seats 51 flows out from the open end of the U-shaped structure and the gap between the extrusion wheel 54 and the bearing seat 52. The aluminum flat tube 6 is immersed in the coolant between the two mounting seats 51 and the coolant in the coolant tank 8.

[0049] Among them, the coolant circulation structure (specifically including a water tank, a pump and a filtering component, etc.) in the embodiment of the present invention is located directly below the workbench 1. A through hole is arranged on the workbench 1 and below the extrusion wheel 54 to communicate with the coolant circulation structure, and a groove 11 is arranged on it and directly below the front end of the coolant tank 9. The groove 11 is arranged along the left-right direction, located adjacent to the rear of the mounting seat 51, and is communicated with the coolant circulation structure. The coolant in the coolant tank 8 and the coolant flowing out from the U-shaped structure both flow to the groove 11.

[0050] Example 2

[0051] See also Figure 1-3 Example 2 provides an extrusion welding device for aluminum flat tubes, and its structure is basically the same as that of Example 1, except that: the weld straightening component 2 in the embodiment of the present invention includes a front flat roller unit 21, a vertical roller unit 22 and a rear flat roller unit 23, which are arranged in sequence from front to back.

[0052] The front flat roller unit 21 and the rear flat roller unit 23 are driven synchronously (via two synchronously driven universal joints). Each unit comprises two flat rollers arranged side by side in a vertical direction and positioned on the upper and lower sides of the aluminum flat tube 6. The vertical roller unit 22 comprises two vertical rollers arranged side by side in a horizontal direction and positioned on the left and right sides of the aluminum flat tube 6. The vertical rollers are arranged vertically and have an annular groove coaxially disposed in their centers to mate with the aluminum flat tube 6. Specifically, the annular groove is an arc-shaped groove.

[0053] The lower and upper rollers of the front flat roller unit 21 are each equipped with a first lower groove and two first upper grooves. The lower and upper rollers of the rear flat roller unit 23 are each equipped with a second lower groove and a second upper groove. The first lower groove, first upper groove, second lower groove, and second upper groove are coaxially arranged with the corresponding flat rollers. The first and second lower grooves each engage with the lower portion of the aluminum flat tube 6 and allow the lower portion of the aluminum flat tube 6 to slide over them. The two first upper grooves are arranged side by side and engage with the upper ends of the two arms of the aluminum flat tube 6, respectively. The upper ends of the two arms of the aluminum flat tube 6 slide in the two first upper grooves. The second upper groove engages with the upper portion of the aluminum flat tube 6, with its left and right sides located outside the corresponding upper ends of the two arms of the aluminum flat tube 6. The upper portion of the aluminum flat tube 6 slides in the second upper groove. The first and second lower grooves are U-shaped grooves with a width equal to the thickness of the aluminum flat tube 6 (with a slight gap to facilitate sliding). The first upper groove and the second upper groove are annular slits. The width of the second upper groove is the same as the thickness of the aluminum flat tube 6 (with a small gap to facilitate sliding), and the width of the first upper groove is the same as the thickness of the aluminum strip constituting the aluminum flat tube 6 (with a small gap to facilitate sliding).

[0054] The results of the aluminum flat tube (made of 3003 aluminum alloy and 1069.6 mm in length) prepared using the device of this patent are as follows:

[0055] Table 1

[0056]

[0057] For commercial products of the same specifications, the pressure resistance of product 1 is about 5Mpa, while the pressure resistance of product 2 is 11-12Mpa. The pressure resistance improvement effect is obvious.

[0058] Example 3

[0059] Example 3 provides an extrusion welding device for aluminum flat tubes. Its structure is basically the same as that of Example 1, except that a negative pressure pipe is provided above the two cooling metal plates 9 in this embodiment of the present invention. The suction port of the negative pressure pipe is positioned forward and faces the extrusion wheel 54. Specifically, the negative pressure pipe is an L-shaped pipe arranged in a left-right direction. Its inner end is bent forward to form a suction port, and its outer end is connected to the fan.

[0060] Example 4

[0061] Example 4 provides an extrusion welding device for an aluminum flat tube, the structure of which is basically the same as that of Example 1, except that the guide assembly 3 and the high-frequency coil 4 in the embodiment of the present invention are arranged on a bracket on the left side of the aluminum flat tube 6 (arranged on the workbench 1).

[0062] Among them, "first" and "second" in this patent only serve to distinguish and have no other special meaning.

[0063] 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Extrusion welding device for aluminum flat tubes, comprising a workbench (1), and a weld straightening component (2), a guiding component (3), a high-frequency coil (4) and an extrusion wheel component (5) sequentially arranged thereon from front to back. The extrusion wheel component (5) includes two welding units arranged side by side left and right. The welding unit includes a mounting seat (51), a bearing seat (52) on the mounting seat (51), an extrusion wheel shaft (53) on the bearing seat (52) and an extrusion wheel (54) on the extrusion wheel shaft (53). The two mounting seats (51) are arranged side by side left and right and are arranged on the workbench (1). The two extrusion wheels (54) are respectively located on the left and right sides of the aluminum flat tube (6). A coolant channel is provided on the extrusion wheel shaft (53), and the coolant channel is connected to a coolant circulation structure through a pipeline; It is characterized in that, A coolant tank (8) is provided at the feed inlet of the chip scraping device (7) behind the extrusion welding device. The welding unit further includes a cooling metal plate (9) and a first soft body (10); The two cooling metal plates (9) are respectively located on the left and right sides of the aluminum flat tube (6), are respectively arranged on the two mounting seats (51), are both arranged along the front-rear direction, and are respectively located directly behind the two extrusion wheels (54); A cooling cavity is provided in the cooling metal plate (9), and a plurality of spray holes are arranged side by side up and down on its front side. It is connected to the coolant circulation structure through a pipeline; The spray holes are arranged towards the rear side of the corresponding extrusion wheel (54) and are connected to the cooling cavity; The coolant tank (8) is connected to the coolant circulation structure through a pipeline. An opening for the aluminum flat tube (6) to pass through is provided in the upper part of its front side. Its front end is located adjacent to the rear of the mounting seat (51), and the coolant overflowing from its front end reaches between the two mounting seats (51); The two first soft bodies (10) are respectively located on the left and right sides of the aluminum flat tube (6), and are located between the rear outer side of the corresponding extrusion wheel (54) and the mounting seat (51) to seal between the extrusion wheel (54) and the mounting seat (51); The mounting seat (51), the extrusion wheel (54) and the first soft body (10) enclose a backward-opening U-shaped structure; The coolant between the two mounting seats (51) flows out from the opening of the U-shaped structure and the gap between the extrusion wheel (54) and the bearing seat (52).

2. The extrusion welding device for aluminum flat tubes according to claim 1, characterized in that: The coolant circulation structure is located directly below the workbench (1); A through hole is provided on the workbench (1) and below the extrusion wheel (54) and is connected to the coolant circulation structure. A groove (11) is provided on it and directly below the front end of the coolant tank (8); The groove (11) is arranged along the left-right direction, is located adjacent to the rear of the mounting seat (51), and is connected to the coolant circulation structure.

3. The extrusion welding device for aluminum flat tubes according to claim 1, characterized in that: The cooling liquid tank (8) is a rectangular tank arranged in the front-back direction, and its left or right side is connected to the cooling liquid circulation structure through a pipeline with a pump, and its rear end is provided with two second soft bodies, which contain cooling liquid; the two second soft bodies are respectively located on the left and right sides of the aluminum flat tube (6), and are arranged side by side and tightly together, and they close the rear end of the cooling liquid tank (8); the aluminum flat tube (6) is immersed in the cooling liquid between the two mounting seats (51) and in the cooling liquid of the cooling liquid tank (8); the opening is a vertically arranged U-shaped opening.

4. The extrusion welding device for aluminum flat tubes according to claim 1, characterized in that: The mounting seat (51) is a rectangular block arranged in the front-to-back direction, and can be adjusted left and right on the workbench (1); the cooling metal plate (9) is arranged at the inner front part of the corresponding mounting seat (51); the bearing seat (52) is arranged at the lower part of the inner end of the front side of the corresponding mounting seat (51), and is a rectangular box structure arranged in the front-to-back direction, the inner side of which is flush with the inner side of the mounting seat (51) on the corresponding side, and is connected to the lubricating oil supply structure through a pipeline.

5. The extrusion welding device for aluminum flat tubes according to claim 4, characterized in that: The cooling metal plate (9) is a rectangular copper plate, and the rear part of its upper side is connected to the coolant circulation structure through a universal bamboo tube; the extrusion wheel (54) is coaxially arranged at the lower part of the extrusion wheel shaft (53) and is located adjacent to and above the bearing seat (52); the extrusion wheel shaft (53) is vertically arranged on the upper side of the bearing seat (52), and is rotatably arranged on the bearing seat (52), and its upper end is connected to the coolant circulation structure through the bamboo tube, and its lower end passes through the bearing seat (52) downward and is open; the coolant channel is coaxially arranged with the extrusion wheel shaft (53).

6. The extrusion welding device for aluminum flat tubes according to claim 1, characterized in that: The high-frequency coil (4) is arranged in the front-to-back direction, is located adjacent to the front of the extrusion wheel (54), and is sleeved outside the aluminum flat tube (6); the guide assembly (3) includes an adjustment seat and a guide bar arranged in the front-to-back direction on the upper side thereof; the adjustment seat is arranged on the workbench (1) so as to be adjustable left and right, and is located on the left or right side of the aluminum flat tube (6); the guide bar is arranged in the front-to-back direction, is located in front of the high-frequency coil (4), and its rear end extends into the high-frequency coil (4). It can be adjusted in the front-to-back direction and vertically on the adjustment seat, and is located between the upper ends of the two arms of the aluminum flat tube (6).

7. The extrusion welding device for aluminum flat tubes according to claim 3, characterized in that: The first soft body (10) and the second soft body are both vertically arranged sponge strips; the first soft body (10) is located in front of the corresponding cooling metal plate (9), is fixed to the inner front end of the corresponding mounting seat (51), and its lower end is fixed to the bearing seat (52).

8. The extrusion welding device for aluminum flat tubes according to claim 1, characterized in that: The weld straightening assembly (2) comprises a front flat roller unit (21), a vertical roller unit (22) and a rear flat roller unit (23) which are arranged in sequence from front to rear; the front flat roller unit (21) and the rear flat roller unit (23) are driven synchronously, and each comprises two flat rollers which are arranged side by side in an upper and lower manner and are respectively located on the upper and lower sides of the aluminum flat tube (6); the vertical roller unit (22) comprises two vertical rollers which are arranged side by side in a left and right manner and are respectively located on the left and right sides of the aluminum flat tube (6), the vertical rollers being arranged vertically and having a coaxial annular groove which matches the aluminum flat tube (6) in the middle thereof; the lower flat roller and the upper flat roller of the front flat roller unit (21) are respectively provided with a first lower groove and two first upper grooves, and the lower flat roller of the rear flat roller unit (23) is provided with a first lower groove and two first upper grooves. The flat rollers at the upper part are respectively provided with a second lower groove 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 flat rollers. The first lower groove and the second lower groove are both matched with the lower part of the aluminum flat tube (6) and are used for the lower part of the aluminum flat tube (6) to slide through. The two first upper grooves are arranged side by side on the left and right and respectively matched with the upper ends of the two arms of the aluminum flat tube (6). The upper ends of the two arms of the aluminum flat tube (6) are respectively slidably arranged in the two first upper grooves; the second upper groove is matched with the upper part of the aluminum flat tube (6), 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 (6); the upper part of the aluminum flat tube (6) is slidably arranged in the second upper groove.

9. The extrusion welding device for aluminum flat tubes according to claim 8, characterized in that: The annular groove is an arc-shaped groove, the first lower groove and the second lower groove are U-shaped grooves, the first upper groove and the second upper groove are annular slits, the width of the second upper groove is the same as the thickness of the aluminum flat tube (6), and the width of the first upper groove is the same as the thickness of the aluminum strip constituting the aluminum flat tube (6).

10. The extrusion welding device for aluminum flat tubes according to claim 1, characterized in that: A negative pressure pipe is provided above between the two cooling metal plates (9), and a suction port of the negative pressure pipe is arranged forward and faces the extrusion wheel (54).

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