A device for scratch brazing of aluminium alloy tubes

Abstract

This application discloses a scraping brazing device for aluminum alloy tubes, comprising: a support mechanism, a drive mechanism, an inner and outer wall scraping mechanism, and a tube fixing mechanism; the support mechanism includes: a mounting base, a molten pool, and a heating ring; the molten pool is disposed on the mounting base; the heating ring is used to heat the molten pool; the drive mechanism includes: a motor, a gear shaft, a driven gear, and a cylinder; the motor output end is connected to the gear shaft; the cylinder is rotatably disposed on the outer circumference of the gear shaft; an internal gear is disposed inside the cylinder; a driving gear is disposed on the gear shaft; the driven gear meshes with the driving gear and the internal gear; the inner and outer wall scraping mechanism includes: an inner scraper and an outer scraper; a clamping area for holding the base material is formed between the inner scraper and the outer scraper; the tube fixing mechanism is disposed on the mounting base. In this solution, after the base material is fixed, it is clamped by the inner and outer scraper and immersed in the brazing filler metal, thus enabling scraping brazing of the base material. The overall device is easy to operate, requires no expensive manufacturing costs, and has high operating efficiency.

Description

Technical Field

[0001] This application relates to the field of aluminum alloy brazing, and more particularly to a scraping brazing device for aluminum alloy pipes. Background Technology

[0002] Brazing is a welding method in which a filler metal with a flux that is below the melting point of the workpiece and the workpiece are heated to the melting temperature of the filler metal, and the liquid filler metal is used to fill the gaps in the solid workpiece to connect the metals.

[0003] Currently, commonly used brazing methods for aluminum alloys include flame brazing, furnace brazing, and scraping brazing.

[0004] Flame brazing is convenient and quick, but the brazing temperature is not easy to control. Furthermore, the melting temperature of the filler metal used in flame brazing, such as Al-Si filler metal, is around 550℃, which is similar to the melting point of aluminum or aluminum alloys. This can cause the base material grains to become coarse, resulting in phenomena such as dissolution defects.

[0005] Furnace brazing requires complex equipment and is costly, but it is suitable for brazing connections of complex parts.

[0006] Scraping brazing can be performed using Sn-based filler metals; currently, scraping brazing is generally done manually, which is not only inefficient but also easily leads to a waste of a large amount of filler metal and flux. Summary of the Invention

[0007] In view of this, the purpose of this application is to provide a scraping brazing device for aluminum alloy pipes, which solves the problem that existing aluminum alloy brazing methods cannot simultaneously achieve ease of use, low cost and high efficiency.

[0008] To achieve the above technical objectives, this application provides a scraping and brazing device for aluminum alloy tubes, comprising: a support mechanism, a drive mechanism, an inner and outer wall scraping mechanism, and a tube fixing mechanism;

[0009] The support mechanism includes: a mounting base, a molten pool, and a heating ring;

[0010] The molten pool is disposed on the mounting base and is used to hold the brazing filler metal;

[0011] The heating ring is disposed on the molten pool tank and is used to heat the molten pool tank;

[0012] The drive mechanism includes: a motor, a gear shaft, a driven gear, and a cylinder;

[0013] The motor is mounted on the mounting base, and its output end is connected to the gear shaft;

[0014] The cylinder is rotatably disposed on the outer periphery of the gear shaft and is parallel to the axial direction of the gear shaft;

[0015] An internal gear is installed inside the cylinder;

[0016] A drive gear is provided on the gear shaft;

[0017] The driven gear is respectively meshed with the driving gear and the internal gear at both ends;

[0018] The inner and outer wall scraping mechanism includes: an inner scraper and an outer scraper;

[0019] One end of the inner scraper is elastically connected to the gear shaft, and the other end extends into the molten pool.

[0020] One end of the outer scraper is elastically connected to the inner circumference of the cylinder, and the other end extends into the molten pool.

[0021] A clamping area for holding the base material is formed between the inner scraper and the outer scraper;

[0022] The pipe fixing mechanism is disposed on the mounting base and is used to fix the base material.

[0023] Furthermore, both the inner scraper and the outer scraper include: a curved rod, a straight rod, a spring, and a scraper head;

[0024] One end of the straight rod is connected to the gear shaft or the inner circumference of the cylinder;

[0025] The curved rod is L-shaped, with one end slidably connected to the straight rod and the other end extending into the molten pool.

[0026] The spring is connected to the curved rod and the straight rod at its two ends, respectively.

[0027] The scraper head is located at the other end of the crank.

[0028] Furthermore, the inner scraper and the outer scraper also include: a connecting rod and a tightening member;

[0029] One end of the connecting rod is connected to the gear shaft or the inner circumference of the cylinder, and the other end is slidably connected to the straight rod;

[0030] The straight rod has a threaded bevel on its right side;

[0031] The tightening element is disposed on the threaded inclined surface and is used to adjust the extension and retraction length of the straight rod relative to the connecting rod.

[0032] Furthermore, a locking head is provided on one end of the crank;

[0033] The straight rod is provided with a slot that cooperates with the locking head to prevent the curved rod and the straight rod from separating.

[0034] Furthermore, the scraper head is rotatably and adjustablely mounted on the crank.

[0035] The scraper head has a cutting edge and a horizontal wheel surface on its radial sides along its rotation direction.

[0036] Furthermore, the ends of the inner scraper and the outer scraper are aligned.

[0037] Furthermore, the molten pool includes multiple grooves, which are evenly distributed around the circumference of the gear shaft.

[0038] Furthermore, the cylinder is rotatably fitted onto the outer periphery of the molten pool.

[0039] Furthermore, the support mechanism also includes: a first support rod, a second support rod, and a third support rod;

[0040] The first support rod, the second support rod, and the third support rod are all fixed to the mounting base;

[0041] The driven gear is rotatably mounted on the first support rod;

[0042] The molten pool is disposed on the second support rod;

[0043] The pipe fixing mechanism is mounted on the third support rod.

[0044] Furthermore, the solder is SnZn9 solder or SnBiIn3Zn high-entropy alloy solder.

[0045] As can be seen from the above technical solutions, this application provides a scraping brazing device for aluminum alloy pipes, including: a support mechanism, a drive mechanism, an inner and outer wall scraping mechanism, and a pipe fixing mechanism; the support mechanism includes: a mounting base, a molten pool, and a heating ring; the molten pool is disposed on the mounting base for placing brazing filler metal; the heating ring is disposed on the molten pool for heating the molten pool; the drive mechanism includes: a motor, a gear shaft, a driven gear, and a cylinder; the motor is disposed on the mounting base, and its output end is connected to the gear shaft; the cylinder is rotatably disposed outside the gear shaft. The cylinder is circumferentially parallel to the gear shaft; an internal gear is provided inside the cylinder; a driving gear is provided on the gear shaft; the driven gear is meshed with the driving gear and the internal gear at both ends respectively; the inner and outer wall scraping mechanism includes: an inner scraper and an outer scraper; one end of the inner scraper is elastically connected to the gear shaft, and the other end extends into the molten pool groove; one end of the outer scraper is elastically connected to the inner circumference of the cylinder, and the other end extends into the molten pool groove; a clamping area for clamping the base material is formed between the inner scraper and the outer scraper; the pipe fixing mechanism is provided on the mounting base for fixing the base material.

[0046] In this solution, after the base material is fixed by the pipe fixing mechanism, the base material is clamped by the inner scraper and the outer scraper and immersed in the brazing filler metal, so that the base material can be scraped and brazed. The whole device is easy to operate, does not require expensive construction costs and has high operating efficiency, effectively solving the problem that existing aluminum alloy brazing methods cannot achieve both ease of use, low cost and high efficiency. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A schematic diagram of the overall structure of a scraping brazing device for aluminum alloy pipes provided in this application embodiment;

[0049] Figure 2 A schematic diagram of the structure of a scraping brazing device for aluminum alloy pipes during operation, provided in an embodiment of this application;

[0050] Figure 3 The morphology of the brazed joint prepared in the first embodiment of the scraping brazing device for aluminum alloy tubing provided in this application;

[0051] Figure 4 The morphology of the brazed joint prepared in a second embodiment of a scraping brazing device for aluminum alloy tubing provided in this application;

[0052] Figure 5 The morphology of the brazed joint prepared in the third embodiment of the scraping brazing device for aluminum alloy tubes provided in this application;

[0053] Figure 6 The morphology of the brazed joint prepared in the fourth embodiment of the scraping brazing device for aluminum alloy pipes provided in this application. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments in this application specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0055] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0057] Please see Figure 1 This application provides a scraping brazing device for aluminum alloy tubes, comprising: a support mechanism 10, a drive mechanism 20, an inner and outer wall scraping mechanism 30, and a tube fixing mechanism 40; the support mechanism 10 includes: a mounting base 11, a molten pool 12, and a heating ring 13; the molten pool 12 is disposed on the mounting base 11 for placing brazing filler metal; the heating ring 13 is disposed on the molten pool 12 for heating the molten pool 12; the drive mechanism 20 includes: a motor 21, a gear shaft 22, a driven gear 23, and a cylinder 24; the motor 21 is disposed on the mounting base 11, and its output end is connected to the gear shaft 22; the cylinder 24 is rotatably disposed on the gear shaft 22. 2. The outer periphery is parallel to the axial direction of the gear shaft 22; an internal gear 241 is provided inside the cylinder 24; a driving gear 221 is provided on the gear shaft 22; the driven gear 23 is meshed with the driving gear 221 and the internal gear 241 at both ends respectively; the inner and outer wall scraping mechanism 30 includes: an inner scraper 31 and an outer scraper 32; one end of the inner scraper 31 is elastically connected to the gear shaft 22, and the other end extends into the molten pool 12; one end of the outer scraper 32 is elastically connected to the inner periphery of the cylinder 24, and the other end extends into the molten pool 12; a clamping area for clamping the base material is formed between the inner scraper 31 and the outer scraper 32; the pipe fixing mechanism 40 is provided on the mounting base 11 for fixing the base material.

[0058] Specifically, when the motor 21 starts, it can drive the gear shaft 22 and the drive gear 221 to rotate. Then, the drive gear 221 drives the driven gear 23 to rotate, and the driven gear 23 drives the inner gear 241 to rotate. The rotating inner gear 241 drives the cylinder 24 and the outer scraper 32 connected to the cylinder to rotate. The rotating gear shaft 22 drives the inner scraper 31 to rotate, thereby realizing the scraping of the base material 60 by the inner scraper 31 and the outer scraper 32.

[0059] In the application, please refer to Figure 2 The base material 60 can be tubular; the gear shaft 22 and the cylinder 24 are concentrically positioned; correspondingly, during brazing, the tube fixing mechanism 40 fixes the base material 60 at a position concentric with the gear shaft 22, and then clamps the base material 60 by the inner scraper 31 and the outer scraper 32. As the motor 21 starts and drives the inner scraper 31 and the outer scraper 32 to rotate around the axis of the gear shaft 22, the inner scraper 31 and the outer scraper 32 can scrape the clamped base material 60. During brazing, the base material 60 is clamped and fixed in the molten pool 12. Then, the heating ring 13 is activated to heat the brazing filler metal to a suitable temperature and maintain that temperature, ensuring the molten brazing filler metal surface covers the base material 60, the inner scraper 31, and the outer scraper 32. Then, the motor 21 is started to perform scraping brazing.

[0060] It should be noted that the description assumes the gear shaft 22 is vertically positioned; the motor 21 can be positioned below the gear shaft 22; the driving gear 221 can be positioned at the end of the gear shaft 22 near the motor 21. The driven gear 23 is horizontally positioned; the molten pool 12 is positioned above the driven gear 23.

[0061] In a further improved embodiment, both the inner scraper 31 and the outer scraper 32 include: a curved rod 33, a straight rod 34, a spring 35, and a scraper head 36; one end of the straight rod 34 is connected to the inner circumference of the gear shaft 22 or the cylinder 24; the curved rod 33 is L-shaped, and one end is slidably connected to the straight rod 34, while the other end extends into the molten pool 12; the two ends of the spring 35 are respectively connected to the curved rod 33 and the straight rod 34; the scraper head 36 is disposed at the other end of the curved rod 33.

[0062] Specifically, the inner scraper 31 and the outer scraper 32 can be configured to have the same structure and dimensions, and be symmetrically arranged. The spring 35 allows the curved rod 33 to provide clamping force to the mother material 60 when clamping it.

[0063] Furthermore, the inner scraper 31 and the outer scraper 32 also include: a connecting rod 37 and a tightening member 38; one end of the connecting rod 37 is connected to the inner circumference of the gear shaft 22 or the cylinder 24, and the other end is slidably connected to the straight rod 34; the right side of the straight rod 34 is provided with a threaded inclined surface; the tightening member 38 is provided on the threaded inclined surface and is used to adjust the extension length of the straight rod 34 relative to the connecting rod 37.

[0064] In other words, in this embodiment, the extension and retraction lengths of the connecting rod 37 and the straight rod 34 can be adjusted by tightening and loosening the tightening member 38 to adapt to the base material 60 of different thicknesses.

[0065] The connecting rod 37 can be sleeved inside the straight rod 34; the straight rod 34 can be sleeved inside the curved rod 33. The end of the curved rod 33 near the spring 35 may have a protrusion to lock and fix the spring 35.

[0066] In one embodiment, a locking head is provided on one end of the crank rod 33; a locking groove is provided on the straight rod 34 to cooperate with the locking head in order to prevent the crank rod 33 and the straight rod 34 from separating.

[0067] In another embodiment, the scraper head 36 is rotatably adjustable on the crank 33; the radial sides of the scraper head 36 along its own rotation direction are the cutting edge and the horizontal wheel surface, respectively.

[0068] Specifically, the bottom of the crank 33 is provided with a groove; the scraper head 36 is installed in the groove. By rotating the scraper head 36, it can rotate to contact the side of the base material 60 to control whether to scrape the outer wall of the base material 60. When the cutting surface of the scraper head 36 is close to the base material 60, when the motor 21 is started, the inner scraper rod 31 and / or the outer scraper rod 32 will scrape the base material 60; when the horizontal wheel surface of the scraper head 36 is close to the base material 60, when the motor 21 is started, the horizontal wheel on the horizontal wheel surface will slide relative to the base material 60 without scraping the base material 60.

[0069] In a more specific embodiment, the inner scraper 31 is aligned with the ends of the outer scraper 32.

[0070] Specifically, during brazing, the base material 60, the inner scraper 31, and the outer scraper 32 are aligned at their ends to ensure the brazing effect.

[0071] In application, multiple molten pools 12 may be included and evenly distributed around the circumference of the gear shaft 22; correspondingly, multiple inner and outer wall scraping mechanisms 30 may be included to ensure that each molten pool 12 has an inner scraper 31 and an outer scraper 32 extending into it. When the motor 21 is started, multiple inner and outer wall scraping mechanisms 30 can scrape the base material 60 simultaneously, which can further improve the welding efficiency.

[0072] Furthermore, the cylinder 24 is rotatably fitted around the outer periphery of the molten pool 12.

[0073] Specifically, the cylinder 24 can be connected to the molten pool 12 via the bearing 50, which makes the overall structure more compact and stable.

[0074] In one embodiment, the support mechanism 10 further includes: a first support rod 14, a second support rod 15, and a third support rod 16; the first support rod 14, the second support rod 15, and the third support rod 16 are all fixed on the mounting base 11; the driven gear 23 is rotatably disposed on the first support rod 14; the molten pool 12 is disposed on the second support rod 15; and the pipe fixing mechanism 40 is disposed on the third support rod 16.

[0075] The driven gear 23 can be connected to the first support rod 14 via the bearing 50. In an embodiment that includes multiple molten pool grooves 12, one molten pool groove 12 can be directly connected to the first support rod 14, specifically ensuring that each molten pool groove 12 is supported.

[0076] The third strut 16 may include four struts and is disposed on the outer periphery of the mounting base 11.

[0077] A baffle extending horizontally to the gear shaft 22 is provided at the upper end of the wall of the molten pool 12, but it does not contact the gear shaft 22. Two heating rings 13 are installed on the lower end face of the molten pool 12 for heating the molten pool 12. The pipe fixing device 25 is installed on the third support rod 16, and its structure can be similar to a three-jaw chuck, which fixes the base material 26 by adjusting the position of the jaws.

[0078] In applications, the solder can be either SnZn9 solder or SnBiIn3Zn high-entropy alloy solder.

[0079] In one implementation method, during use, the extension lengths of the inner scraper 31 and outer scraper 32 can be reduced by adjusting the tightening member 38, and the end face of the scraper head 36 can be adjusted to determine whether the inner or outer wall of the base material 60 is scraped. Then, a 6061 aluminum alloy tube is passed through the middle of the tube fixing mechanism 40 as the base material 60. The height is adjusted so that the lower end face of the base material 60 is parallel to the bottom surface of the scraper head 36 of the inner scraper 31 and outer scraper 32. The position of the locking teeth of the tube fixing mechanism 25 is adjusted to fix the base material 60. The tightening member 38 is adjusted again to appropriately extend the extension lengths of the inner scraper 31 and outer scraper 32, so that the scraper head 36 is pressed tightly against the tube wall with a certain pressure. SnZn9 brazing filler metal and an appropriate amount of rosin are placed in the molten pool 12. The heating ring 13 is energized and put into operation, heating the brazing filler metal to 220°C and maintaining the temperature, so that the molten brazing filler metal surface covers the scraper head 36. Turn on motor 21 and scrape. After a certain period of time, an aluminum alloy tube with a layer of brazing filler metal welded to its inner or outer wall can be obtained. Remove the tube and heat the brazing filler metal layers of two 6061 aluminum alloy tubes with matching dimensions and brazing filler metal welded to their inner and outer walls respectively to obtain a brazed aluminum alloy tube. Observe the joint morphology using a scanning electron microscope as follows: Figure 3 As shown, the interface between the base material and the brazing filler metal in the brazed joint exhibits a uniform wavy shape with no obvious gaps. The shear strength of the brazed joint was tested using an MFM1200 shear force tester, and the results showed that the shear strength of the brazed joint can reach over 50 MPa.

[0080] In the second implementation method, during use, the extension lengths of the inner scraper 31 and outer scraper 32 can be reduced by adjusting the tightening member 38, and the end face of the scraper head 36 can be adjusted to determine whether to scrape the inner or outer wall of the base material 60. Then, a 6063 aluminum alloy tube is passed through the middle of the tube fixing mechanism 40 as the base material 60. The height is adjusted so that the lower end face of the base material 60 is parallel to the bottom surface of the scraper head 36 of the inner scraper 31 and outer scraper 32. The position of the locking teeth of the tube fixing mechanism 25 is adjusted to fix the base material 60. The tightening member 38 is adjusted again to appropriately extend the extension lengths of the inner scraper 31 and outer scraper 32, so that the scraper head 36 is close to the tube wall and has a certain pressure. SnZn9 brazing filler metal and an appropriate amount of rosin are placed in the molten pool 12. The heating ring 13 is energized and put into operation, heating the brazing filler metal to 220°C and maintaining the temperature, so that the molten brazing filler metal surface covers the scraper head 36. Turn on motor 21 and scrape. After a certain period of time, an aluminum alloy tube with a layer of brazing filler metal welded to its inner or outer wall can be obtained. Remove the tube and heat the brazing filler metal layers of two 6063 aluminum alloy tubes with matching dimensions and brazing filler metal welded to their inner and outer walls respectively, to obtain a brazed aluminum alloy tube. The interface between the base material and the brazing filler metal of the welding joint is as follows. Figure 4 As shown, it has a uniform wavy shape with no obvious gaps, and the shear strength is above 50 MPa.

[0081] In the third implementation, during use, the extension lengths of the inner scraper 31 and outer scraper 32 can be reduced by adjusting the tightening member 38, and the end face of the scraper head 36 can be adjusted to determine whether to scrape the inner or outer wall of the base material 60. Then, a 6061 aluminum alloy tube is passed through the middle of the tube fixing mechanism 40 as the base material 60. The height is adjusted so that the lower end face of the base material 60 is parallel to the bottom surface of the scraper head 36 of the inner scraper 31 and outer scraper 32. The position of the locking teeth of the tube fixing mechanism 25 is adjusted to fix the base material 60. The tightening member 38 is adjusted again to appropriately extend the extension lengths of the inner scraper 31 and outer scraper 32, so that the scraper head 36 is close to the tube wall and has a certain pressure. SnBiIn3Zn brazing filler metal and an appropriate amount of rosin are placed in the molten pool 12. The heating ring 13 is energized and put into operation, heating the brazing filler metal to 100°C and maintaining the temperature, so that the molten brazing filler metal surface covers the scraper head 36. Turn on motor 21 and scrape. After a certain period of time, an aluminum alloy tube with a layer of brazing filler metal welded to its inner or outer wall can be obtained. Remove the tube and heat the brazing filler metal layers of two 6061 aluminum alloy tubes with matching dimensions and brazing filler metal welded to their inner and outer walls respectively to obtain a brazed aluminum alloy tube. Observe the joint morphology using a scanning electron microscope as follows: Figure 5 As shown, the interface between the base material and the brazing filler metal in the brazed joint exhibits a uniform wavy shape with no obvious gaps. The shear strength of the brazed joint was tested using an MFM1200 shear force tester, and the results showed that the shear strength of the brazed joint can reach over 30 MPa.

[0082] In the fourth implementation, during use, the extension lengths of the inner scraper 31 and outer scraper 32 can be reduced by adjusting the tightening member 38, and the end face of the scraper head 36 can be adjusted to determine whether to scrape the inner or outer wall of the base material 60. Then, a 6061 aluminum alloy tube is passed through the middle of the tube fixing mechanism 40 as the base material 60. The height is adjusted so that the lower end face of the base material 60 is parallel to the bottom surface of the scraper head 36 of the inner scraper 31 and outer scraper 32. The position of the locking teeth of the tube fixing mechanism 25 is adjusted to fix the base material 60. The tightening member 38 is adjusted again to appropriately extend the extension lengths of the inner scraper 31 and outer scraper 32, so that the scraper head 36 is close to the tube wall and has a certain pressure. SnZn9 brazing filler metal and an appropriate amount of rosin are placed in the molten pool 12. The heating ring 13 is energized and put into operation, heating the brazing filler metal to 220°C and maintaining the temperature, so that the molten brazing filler metal surface covers the scraper head 36. Turn on motor 21 and scrape. After a certain period of time, an aluminum alloy tube with a layer of brazing filler metal welded to its inner or outer wall can be obtained. Remove the tube, apply a layer of KE-150 flux to the surface of the brazing filler metal layer on the end of the aluminum alloy tube with the brazing filler metal welded to its inner or outer wall, and heat it to bond with a T2 copper alloy tube of matching size. Observe the morphology of the brazed joint using a scanning electron microscope. Figure 6 As shown, the aluminum alloy base material and SnZn9 brazing filler metal bond well, as do the copper alloy base material and SnZn9 brazing filler metal, forming a metallurgical bonding layer at the interface. The shear strength of the copper / aluminum dissimilar metal brazed joint was tested using an MFM1200 shear force tester, and the shear strength of the brazed joint reached 25 MPa.

[0083] Based on the four examples above, it can be seen that this device can achieve high-performance brazed joints by scraping and brazing two different aluminum alloy tubes, 6061 and 6063, using SnZn9 brazing filler metal at a low temperature (220℃); it can also achieve scraping and brazing of aluminum alloy tubes using SnBiIn3Zn high-entropy alloy brazing filler metal at an even lower temperature (100℃); and it can also achieve brazing of copper and aluminum tubes.

[0084] The above are merely preferred embodiments of this application and are not intended to limit the present invention. Although this application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A scraping brazing device for aluminum alloy pipes, characterized in that, include: Support mechanism (10), drive mechanism (20), inner and outer wall scraping mechanism (30) and pipe fixing mechanism (40); The support mechanism (10) includes: a mounting base (11), a molten pool (12), and a heating ring (13); The molten pool (12) is disposed on the mounting base (11) for placing the brazing filler metal; The heating ring (13) is disposed on the molten pool (12) and is used to heat the molten pool (12). The drive mechanism (20) includes: a motor (21), a gear shaft (22), a driven gear (23), and a cylinder (24); The motor (21) is mounted on the mounting base (11) and its output end is connected to the gear shaft (22). The cylinder (24) is rotatably disposed on the outer periphery of the gear shaft (22) and is parallel to the axial direction of the gear shaft (22); An internal gear (241) is provided inside the cylinder (24); A drive gear (221) is provided on the gear shaft (22); The driven gear (23) is meshed with the driving gear (221) and the internal gear (241) at both ends respectively. The inner and outer wall scraping mechanism (30) includes: an inner scraper (31) and an outer scraper (32); One end of the inner scraper (31) is elastically connected to the gear shaft (22), and the other end extends into the molten pool (12); One end of the outer scraper (32) is elastically connected to the inner circumference of the cylinder (24), and the other end extends into the molten pool (12); The inner scraper (31) and the outer scraper (32) form a clamping area for clamping the base material; The pipe fixing mechanism (40) is disposed on the mounting base (11) and is used to fix the base material; The cylinder (24) is rotatably fitted around the outer periphery of the molten pool (12); The support mechanism (10) further includes: a first support rod (14), a second support rod (15) and a third support rod (16). The first support rod (14), the second support rod (15) and the third support rod (16) are all fixed on the mounting base (11); The driven gear (23) is rotatably mounted on the first support rod (14); The molten pool (12) is disposed on the second support rod (15); The pipe fixing mechanism (40) is mounted on the third support rod (16).

2. The scraping brazing device for aluminum alloy pipes according to claim 1, characterized in that, Both the inner scraper (31) and the outer scraper (32) include: a curved rod (33), a straight rod (34), a spring (35), and a scraper head (36); One end of the straight rod (34) is connected to the gear shaft (22) or the inner circumference of the cylinder (24); The curved rod (33) is L-shaped, and one end is slidably connected to the straight rod (34), while the other end extends into the molten pool (12); The two ends of the spring (35) are respectively connected to the crank (33) and the straight rod (34); The scraper (36) is located at the other end of the crank (33).

3. The scraping brazing device for aluminum alloy pipes according to claim 2, characterized in that, The inner scraper (31) and the outer scraper (32) also include: a connecting rod (37) and a tightening member (38); One end of the connecting rod (37) is connected to the inner circumference of the gear shaft (22) or the cylinder (24), and the other end is slidably connected to the straight rod (34). The straight rod (34) has a threaded bevel on its right side; The tightening member (38) is disposed on the threaded inclined surface and is used to adjust the extension length of the straight rod (34) relative to the connecting rod (37).

4. The scraping brazing device for aluminum alloy pipes according to claim 2, characterized in that, A locking head is provided on one end of the crank (33); The straight rod (34) is provided with a slot that cooperates with the locking head to prevent the curved rod (33) and the straight rod (34) from separating.

5. The scraping brazing apparatus for aluminum alloy tubing according to any one of claims 2 to 4, characterized in that, The scraper head (36) is rotatably and adjustablely mounted on the crank (33); The scraper (36) has a cutting edge and a horizontal wheel surface on its radial sides along its own rotation direction.

6. The scraping brazing apparatus for aluminum alloy tubing according to any one of claims 1 to 4, characterized in that, The inner scraper (31) is aligned with the end of the outer scraper (32).

7. The scraping brazing device for aluminum alloy pipes according to claim 1, characterized in that, The solder is either SnZn9 solder or SnBiIn3Zn high-entropy alloy solder.

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