Automatic welding line and welding method for aluminum brazing of heat exchanger

Abstract

The invention belongs to the technical field of heat exchanger aluminum brazing, and particularly relates to an automatic heat exchanger aluminum brazing welding line and a welding method.The automatic heat exchanger aluminum brazing welding line comprises a welding cavity, a conveying mechanism, a sliding rail, a sliding block, a welding mechanism and a driving part, the conveying mechanism is arranged on the right side of the welding cavity, and the sliding rail is fixedly installed in the welding cavity; the sliding block is connected to the upper portion of the sliding rail in a sliding mode, and the welding mechanism is fixedly installed on the upper portion of the sliding block. The driving part comprises a cavity, a connecting rod, a sleeve, a buffer spring I, a motor and a gear; the cavity is fixedly installed on the right side of the sliding rail, a through hole is formed in the left side of the cavity, the connecting rod is arranged in the through hole, the left end of the connecting rod is fixed to the sliding block, the first buffer spring is arranged in the sleeve, and the connecting rod is slidably connected into the sleeve. The device solves the problems that the welding quality is damaged due to the fact that a welding mechanism moves and shakes during aluminum brazing of a current heat exchanger, and the surface quality is affected due to the high oxidation speed.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum brazing of heat exchangers, and in particular relates to an automatic welding line and a welding method for aluminum brazing of heat exchangers. Background Art

[0002] The production of heat exchangers is usually carried out by aluminum brazing. Aluminum brazing is a welding method that uses a metal material with a lower melting point than the base material as a brazing filler metal. The brazing filler metal is melted by heating and fills the gap between the workpiece interfaces, and then diffuses with the base material to form a connection.

[0003] What needs to be noted in aluminum brazing is that oxidation reactions are prone to occur during the welding process, resulting in the generation of oxides on the heat exchanger, and the use of flux is also one of the key steps. The flux can remove oxides on the surface of the brazing material and the base material and improve the wetting effect. Selecting a suitable flux and using it correctly can ensure the smooth progress of the brazing process. In the prior art, the flux is applied or sprayed before welding, which will result in poor drying and anti-oxidation effects of the flux during welding. In addition, during welding, the welding mechanism needs to be moved frequently to align with the heat exchanger, which will cause the welding mechanism to jam when moving, thereby causing shaking that affects the alignment of the welding position, thereby reducing the welding quality. Summary of the invention

[0004] The object of the present invention is to provide an automatic welding line and a welding method for aluminum brazing of a heat exchanger to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an automatic welding line and welding method for aluminum brazing of a heat exchanger, comprising a welding chamber, a transmission mechanism, a slide rail, a slider, a welding mechanism and a driving unit, wherein the transmission mechanism is arranged on the right side of the welding chamber, the slide rail is fixedly installed inside the welding chamber, the slider is slidably connected to the top of the slide rail, and the welding mechanism is fixedly installed above the slider; the driving unit comprises a chamber, a connecting rod, a sleeve, a buffer spring 1, a motor and a gear; the chamber is fixedly installed on the right side of the slide rail, and a through hole is opened on the left side, the connecting rod is arranged in the through hole, and the left end is fixed to the slider, the buffer spring 1 is arranged inside the sleeve, and the connecting rod is slidably connected in the sleeve, the buffer spring 1 is located between the right end of the connecting rod and the right side of the inner wall of the sleeve, the motor is fixedly installed on the inner wall of the chamber, and the gear is fixedly connected to the output end of the motor, and a plurality of tooth blocks are arranged below the sleeve, and mesh with the gear through the tooth blocks.

[0006] The present invention further illustrates that a push-pull rod is fixed at the lower right end of the sleeve, a hydraulic chamber is fixed at the left side of the inner wall of the chamber, two hydraulic plates are slidably connected to the inner wall of the hydraulic chamber, a fixed plate is arranged between the two hydraulic plates, and the fixed plate is fixed to the inner wall of the hydraulic chamber, a sliding hole is arranged in the middle of the fixed plate, and a fixed rod is slidably connected in the sliding hole, and both ends of the fixed rod are respectively connected to the two hydraulic plates; the left side of the left hydraulic plate is filled with brazing agent, and the left side of the hydraulic chamber is connected to the external brazing agent pipeline, and a one-way valve 1 is arranged in the pipeline, the left side of the hydraulic chamber is connected to a liquid spray pipe, and a one-way valve 2 is arranged in the liquid spray pipe, a plurality of nozzles are connected to the top of the liquid spray pipe, and the left end of the push-pull rod is fixedly connected to the hydraulic plate on the right.

[0007] The present invention further illustrates that a buffer cavity is fixed on the left side of the inner wall of the chamber, a buffer plate is slidably connected to the inner wall of the buffer cavity, a buffer rod is fixedly connected to the right side of the buffer plate, and the buffer rod is connected to the bottom bearing of the connecting rod; a buffer spring 2 is fixed between the left side of the buffer plate and the left side of the inner wall of the buffer cavity, two holes are provided on the surface of the buffer plate, a pipeline is connected between the left side of the buffer cavity and the right side of the fixed plate, and the left side of the hydraulic plate on the right side is filled with hydraulic oil.

[0008] The present invention further illustrates that a telescopic joint is fixed to the right side of the inner wall of the chamber, a tooth plate is fixed to the upper end of the telescopic joint, a disc is fixed to the outside of the connecting rod, and a circular hole is provided on the outside of the disc, a round rod is slidably connected in the circular hole, a tooth plate is fixed to the right end of the round rod, and the tooth plate is connected to the inner wall bearing of the chamber and meshes with the tooth plate.

[0009] The present invention further illustrates that the lower pipe of the expansion joint is connected to an air cavity, and a pressure valve is arranged in the pipe, the air cavity is connected to the right pipe of the hydraulic cavity, and a one-way valve three is arranged in the pipe, the right side of the hydraulic cavity is connected to the external pipe, and a one-way valve four is arranged in the pipe; the expansion joint is connected to the external control valve pipe, and a fan blade is fixed to the outside of the connecting rod, and the fan blade is located on the right side of the slider.

[0010] The present invention further describes that a temperature sensor is arranged inside the welding cavity, and a temperature sensing module is arranged inside the temperature sensor, a torque adjustment module is arranged inside the motor, the temperature sensing module is electrically connected to the torque adjustment module, the temperature sensing module is used to sense the temperature in the welding cavity during the brazing process, and the torque adjustment module is used to automatically adjust the torque of the motor according to the brazing environment temperature.

[0011] The present invention further illustrates that the torque adjustment method of the motor is: Q is the real-time torque of the motor, Q max is the maximum torque of the motor, C is the brazing ambient temperature, C maxIt is the maximum ambient temperature for brazing. The higher the ambient temperature for brazing, the greater the torque of the motor.

[0012] The present invention further illustrates that the welding method includes: step S1, placing the heat exchanger on the conveying mechanism and conveying it into the welding chamber through the conveying mechanism; step S2, the driving unit controls the movement of the slider so that the welding mechanism moves to the heat exchanger position; step S3, the welding mechanism operates to perform aluminum brazing on the heat exchanger, and after the aluminum brazing is completed, the welding mechanism is reset, and the conveying mechanism conveys the welded heat exchanger out; step S4, repeating steps S1 to S3 to perform continuous aluminum brazing.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: when the welding mechanism is moved, the motor rotates quickly, so that the welding mechanism moves faster. At this time, the sliders generate friction with each other, which may cause jamming. When the jamming occurs, the buffer spring is stressed and generates a reaction force to buffer the welding mechanism, thereby preventing the welding mechanism from continuously shaking and causing the welding wire to fall off or damaging the welding mechanism, playing a protective role and improving the stability of the movement of the welding mechanism.

[0014] In the process of aluminum brazing, oxides appear on the surface of the brazing material and the parent material. At this time, the rapid rotation of the motor can make the welding mechanism quickly and smoothly in place, and the sleeve moves quickly, so that the nozzle sprays the brazing flux into the welding cavity. The brazing flux falls on the heat exchanger and the brazing material, which can slow down oxidation or even avoid oxidation. The brazing flux can remove oxides on the surface of the brazing material and the parent material, improve wetting, and ensure the smooth progress of the aluminum brazing process. The rapid rotation of the motor can increase the brazing spray force, so that the inside of the welding cavity is fully wetted, further improving the welding quality. The left and right sides of the welding mechanism can be damped during the movement, thereby further preventing shaking when the welding mechanism is moved.

[0015] After the hydraulic oil enters the buffer chamber, the buffer plate squeezes the hydraulic oil when it moves to the left. After being squeezed, the hydraulic oil enters the right side of the buffer plate through the hole, and the buffer strength is increased by hydraulic means, thereby greatly enhancing the shock absorption effect and ensuring the subsequent welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the relative positions of the welding mechanism, the slider, the slide rail and the chamber of the present invention;

[0019] Figure 3 It is a schematic plan view of the internal structure of the chamber of the present invention;

[0020] Figure 4 It is a schematic diagram of the internal structure of the chamber of the present invention;

[0021] Figure 5 It is a schematic diagram of the pipeline connection mode between the hydraulic chamber, the expansion joint and the buffer chamber of the present invention;

[0022] Figure 6 It is a schematic diagram of the internal structure of the sleeve of the present invention;

[0023] Figure 7 It is a plan view of the pipeline connection method of the hydraulic chamber, the expansion joint and the buffer chamber of the present invention;

[0024] In the figure: 1. welding chamber; 2. transmission mechanism; 3. slide rail; 4. slider; 5. welding mechanism; 6. chamber; 61. connecting rod; 611. disc; 612. round rod; 613. toothed disc; 62. sleeve; 621. push-pull rod; 63. buffer spring 1; 64. motor; 641. gear; 65. hydraulic chamber; 651. hydraulic plate; 652. fixed plate; 653. fixed rod; 66. spray pipe; 67. nozzle; 68. buffer chamber; 681. buffer plate; 682. buffer rod; 683. buffer spring 2; 684. hole; 69. telescopic joint; 691. toothed plate; 692. air chamber; 7. fan blade. DETAILED DESCRIPTION

[0025] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-7 The present invention provides a technical solution: an automatic welding line and a welding method for aluminum brazing of a heat exchanger, comprising a welding chamber 1, a transmission mechanism 2, a slide rail 3, a slider 4, a welding mechanism 5 and a driving unit, wherein the transmission mechanism 2 is arranged on the right side of the welding chamber 1, the slide rail 3 is fixedly installed inside the welding chamber 1, the slider 4 is slidably connected to the upper part of the slide rail 3, and the welding mechanism 5 is fixedly installed above the slider 4;

[0027] The driving part includes a chamber 6, a connecting rod 61, a sleeve 62, a buffer spring 63, a motor 64 and a gear 641;

[0028] The chamber 6 is fixedly installed on the right side of the slide rail 3, and a through hole is opened on the left side. The connecting rod 61 is arranged in the through hole, and the left end is fixed to the slider 4. The buffer spring 1 63 is arranged inside the sleeve 62, and the connecting rod 61 is slidably connected in the sleeve 62. The buffer spring 1 63 is located between the right end of the connecting rod 61 and the right side of the inner wall of the sleeve 62. The motor 64 is fixedly installed on the inner wall of the chamber 6, and the gear 641 is fixedly connected to the output end of the motor 64. A plurality of tooth blocks are arranged below the sleeve 62, and the tooth blocks are meshed with the gear 641.

[0029] The operator places the heat exchanger on the conveying mechanism 2 and conveys the heat exchanger to the welding chamber 1 through the conveying mechanism 2. Then the motor 64 runs, driving the gear 641 to rotate. The gear 641 drives the sleeve 62 to move to the left by meshing with the tooth block. The sleeve 62 drives the slider 4 to slide to the left along the slide rail 3 through the connecting rod 61, thereby driving the welding mechanism 5 to move to the heat exchanger position. Welding is performed through the welding mechanism 5. When moving the welding mechanism 5, the motor 64 rotates rapidly, so that the welding mechanism 5 moves faster. At this time, due to the friction between the slider 4 and the slide rail 3, jamming will occur, so that the buffer spring 63 is stressed during the jam, generating a reaction force to buffer the welding mechanism 5, thereby preventing the welding mechanism 5 from shaking continuously and causing the welding wire to fall off or damaging the welding mechanism 5, thereby playing a protective role and improving the stability of the movement of the welding mechanism 5.

[0030] A push-pull rod 621 is fixed below the right end of the sleeve 62, a hydraulic chamber 65 is fixed to the left side of the inner wall of the chamber 6, two hydraulic plates 651 are slidably connected to the inner wall of the hydraulic chamber 65, a fixed plate 652 is arranged between the two hydraulic plates 651, and the fixed plate 652 is fixed to the inner wall of the hydraulic chamber 65, a sliding hole is arranged in the middle of the fixed plate 652, and a fixed rod 653 is slidably connected in the sliding hole, and both ends of the fixed rod 653 are respectively connected to the two hydraulic plates 651;

[0031] The left side of the left hydraulic plate 651 is filled with brazing agent, and the left side of the hydraulic chamber 65 is connected to an external brazing agent pipeline, and a one-way valve 1 is arranged in the pipeline, the left side of the hydraulic chamber 65 is connected to a liquid spraying pipe 66, and a one-way valve 2 is arranged in the liquid spraying pipe 66, and a plurality of spray heads 67 are connected to the top of the liquid spraying pipe 66, and the left end of the push-pull rod 621 is fixedly connected to the right hydraulic plate 651;

[0032] During the aluminum brazing process, oxides appear on the surfaces of the brazing material and the base material. At this time, the rapid rotation of the motor 64 can, on the one hand, enable the welding mechanism 5 to be quickly and smoothly in place, and on the other hand, the sleeve 62 moves quickly, and the push-pull rod 621 drives the hydraulic plate 651 on the right to slide quickly along the inner wall of the hydraulic chamber 65. The hydraulic plate 651 on the right drives the hydraulic plate 651 on the left to slide quickly to the left along the inner wall of the hydraulic chamber 65 through the fixed rod 653. The brazing agent on the left side is squeezed into the nozzle 67 through the spray pipe 66, and then sprayed from the nozzle 67 into the welding chamber 1. The brazing agent falls on the heat exchanger and the brazing material, which can slow down oxidation or even avoid oxidation. The brazing agent can remove oxides on the surfaces of the brazing material and the base material, improve wetting, and ensure the smooth progress of the aluminum brazing process. In addition, the rapid rotation of the motor 64 can increase the spraying force of the brazing, so that the inside of the welding chamber 1 is fully wetted, further improving the welding quality.

[0033] A buffer cavity 68 is fixed on the left side of the inner wall of the chamber 6, a buffer plate 681 is slidably connected to the inner wall of the buffer cavity 68, a buffer rod 682 is fixedly connected to the right side of the buffer plate 681, and the buffer rod 682 is connected to the bottom bearing of the connecting rod 61;

[0034] A buffer spring 683 is fixed between the left side of the buffer plate 681 and the left side of the inner wall of the buffer chamber 68. Two holes 684 are arranged on the surface of the buffer plate 681. The left side of the buffer chamber 68 and the right side of the fixed plate 652 are connected by a pipeline. The left side of the right hydraulic plate 651 is filled with hydraulic oil.

[0035] When the motor 64 rotates, the hydraulic plate 651 on the right side of the hydraulic chamber 65 quickly slides to the left along the inner wall of the hydraulic chamber 65, and the hydraulic oil on the left side thereof is squeezed and enters the buffer chamber 68 through the pipeline. When the connecting rod 61 drives the welding mechanism 5 to move, the connecting rod 61 drives the buffer plate 681 to slide to the left along the inner wall of the buffer chamber 68 through the buffer rod 682, and the buffer spring 683 is deformed by force to generate a reaction force, so that the left and right sides of the welding mechanism 5 can be damped during the movement, thereby further preventing the welding mechanism 5 from shaking when it is moved;

[0036] After the hydraulic oil enters the buffer chamber 68, the buffer plate 681 squeezes the hydraulic oil when it moves to the left. After being squeezed, the hydraulic oil enters the right side of the buffer plate 681 through the hole 684, and the buffer strength is increased by hydraulic means, thereby greatly enhancing the shock absorption effect and ensuring the subsequent welding quality.

[0037] A telescopic joint 69 is fixed to the right side of the inner wall of the chamber 6, a tooth plate 691 is fixed to the upper end of the telescopic joint 69, a disc 611 is fixed to the outer side of the connecting rod 61, and a circular hole is provided on the outer side of the disc 611, a round rod 612 is slidably connected in the circular hole, a tooth plate 613 is fixed to the right end of the round rod 612, the tooth plate 613 is connected to the inner wall bearing of the chamber 6, and meshes with the tooth plate 691.

[0038] The pipeline below the expansion joint 69 is connected to an air cavity 692, and a pressure valve is arranged in the pipeline. The air cavity 692 is connected to the pipeline on the right side of the hydraulic cavity 65, and a check valve 3 is arranged in the pipeline. The right side of the hydraulic cavity 65 is connected to the external pipeline, and a check valve 4 is arranged in the pipeline.

[0039] The expansion joint 69 is connected to the external control valve pipeline, and the fan blade 7 is fixed to the outside of the connecting rod 61, and the fan blade 7 is located on the right side of the slider 4;

[0040] During the welding process, multiple heat exchangers are welded, so that the hydraulic plate 651 on the right side continuously slides left and right along the inner wall of the hydraulic chamber 65, and the right side of the hydraulic chamber 65 continuously extracts gas from the outside and injects it into the air chamber 692. After multiple heat exchangers are welded, the air pressure in the air chamber 692 reaches the pressure bearing limit of the pressure valve, the pressure valve opens, and the gas quickly enters the expansion joint 69 through the pipeline, causing it to quickly extend, thereby driving the tooth plate 691 to move upward quickly, and the tooth plate 691 drives the toothed disc 613 to rotate quickly through meshing, and the toothed disc 613 drives the disc 611 to rotate quickly through the round rod 612, thereby driving the connecting rod 61 to rotate quickly, and the connecting rod 61 drives the fan blade 7 to rotate quickly, and the welding mechanism 5 is blown. After that, the external control valve is opened, so that the internal pressure of the expansion joint 69 returns to normal, thereby resetting, and impurities on the heat exchanger can be cleaned to avoid impurities generated at the welding part of the heat exchanger during welding to affect the welding quality. In addition, intermittent blowing can not only clean impurities on the heat exchanger, but also avoid the sprayed brazing agent from being blown away to affect the anti-oxidation effect of the brazing agent.

[0041] A temperature sensor is arranged inside the welding chamber 1, and a temperature sensing module is arranged inside the temperature sensor. A torque adjustment module is arranged inside the motor 64. The temperature sensing module is electrically connected to the torque adjustment module. The temperature sensing module is used to sense the temperature inside the welding chamber 1 during the brazing process. The torque adjustment module is used to automatically adjust the torque of the motor 64 according to the brazing environment temperature.

[0042] The torque adjustment method of the motor 64 is:

[0043] Q is the real-time torque of the motor 64, Q max is the maximum torque of the motor 64, C is the brazing ambient temperature, C max is the maximum ambient temperature of brazing. When the ambient temperature of brazing is higher, the torque of the motor 64 is greater.

[0044] When the ambient temperature of brazing is high, the torque of the motor 64 is increased to enhance the anti-oxidation effect. Otherwise, the torque of the motor 64 is reduced, which not only ensures the spraying of the brazing agent and the blowing, but also reduces energy consumption, thereby reducing costs.

[0045] Welding methods include;

[0046] Step S1, placing the heat exchanger on the conveying mechanism 2, and conveying it into the welding chamber 1 through the conveying mechanism 2;

[0047] Step S2, the driving unit controls the slider 4 to move so that the welding mechanism 5 moves to the heat exchanger position;

[0048] Step S3, the welding mechanism 5 is operated to perform aluminum brazing on the heat exchanger. After the aluminum brazing is completed, the welding mechanism 5 is reset, and the conveying mechanism 2 conveys the welded heat exchanger out;

[0049] Step S4, repeating steps S1 to S3 to perform continuous aluminum brazing.

[0050] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0051] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat exchanger aluminum brazing automatic welding line, comprising a welding chamber (1), a conveying mechanism (2), a slide rail (3), a slider (4), a welding mechanism (5) and a driving unit, characterized in that: The conveying mechanism (2) is arranged on the right side of the welding chamber (1), the slide rail (3) is fixedly installed inside the welding chamber (1), the slider (4) is slidably connected to the top of the slide rail (3), and the welding mechanism (5) is fixedly installed above the slider (4); The driving part comprises a chamber (6), a connecting rod (61), a sleeve (62), a buffer spring (63), a motor (64) and a gear (641); The chamber (6) is fixedly installed on the right side of the slide rail (3), and a through hole is opened on the left side. The connecting rod (61) is arranged in the through hole, and the left end is fixed to the slider (4). The buffer spring (63) is arranged inside the sleeve (62), and the connecting rod (61) is slidably connected in the sleeve (62). The buffer spring (63) is located between the right end of the connecting rod (61) and the right side of the inner wall of the sleeve (62). The motor (64) is fixedly installed on the inner wall of the chamber (6), and the gear (641) is fixedly connected to the output end of the motor (64). A plurality of tooth blocks are arranged below the sleeve (62), and the tooth blocks are meshed with the gear (641).

2. The heat exchanger aluminum brazing automatic welding line according to claim 1 is characterized by: A push-pull rod (621) is fixed below the right end of the sleeve (62), a hydraulic chamber (65) is fixed on the left side of the inner wall of the chamber (6), two hydraulic plates (651) are slidably connected to the inner wall of the hydraulic chamber (65), a fixed plate (652) is arranged between the two hydraulic plates (651), and the fixed plate (652) is fixed to the inner wall of the hydraulic chamber (65), a sliding hole is arranged in the middle of the fixed plate (652), and a fixed rod (653) is slidably connected in the sliding hole, and both ends of the fixed rod (653) are respectively connected to the two hydraulic plates (651); The left side of the left hydraulic plate (651) is filled with brazing agent, and the left side of the hydraulic chamber (65) is connected to an external brazing agent pipeline, and a one-way valve is arranged in the pipeline. The left side of the hydraulic chamber (65) is connected to a liquid spraying pipe (66), and a one-way valve is arranged in the liquid spraying pipe (66). A plurality of spray heads (67) are connected to the top of the liquid spraying pipe (66). The left end of the push-pull rod (621) is fixedly connected to the hydraulic plate (651) on the right side.

3. The heat exchanger aluminum brazing automatic welding line according to claim 2 is characterized by: A buffer cavity (68) is fixed on the left side of the inner wall of the chamber (6), a buffer plate (681) is slidably connected to the inner wall of the buffer cavity (68), a buffer rod (682) is fixedly connected to the right side of the buffer plate (681), and the buffer rod (682) is connected to the bottom bearing of the connecting rod (61); A buffer spring 2 (683) is fixed between the left side of the buffer plate (681) and the left side of the inner wall of the buffer chamber (68), two holes (684) are provided on the surface of the buffer plate (681), the left side of the buffer chamber (68) and the right side of the fixed plate (652) are connected by a pipeline, and the left side of the right hydraulic plate (651) is filled with hydraulic oil.

4. The heat exchanger aluminum brazing automatic welding line according to claim 3 is characterized by: A telescopic joint (69) is fixed to the right side of the inner wall of the chamber (6), a toothed plate (691) is fixed to the upper end of the telescopic joint (69), a disc (611) is fixed to the outer side of the connecting rod (61), and a circular hole is provided on the outer side of the disc (611), a round rod (612) is slidably connected in the circular hole, a toothed plate (613) is fixed to the right end of the round rod (612), and the toothed plate (613) is connected to the inner wall bearing of the chamber (6) and meshes with the toothed plate (691).

5. The heat exchanger aluminum brazing automatic welding line according to claim 4 is characterized in that: The pipeline below the telescopic joint (69) is connected to an air cavity (692), and a pressure valve is arranged in the pipeline; the air cavity (692) is connected to the pipeline on the right side of the hydraulic cavity (65), and a check valve three is arranged in the pipeline; the right side of the hydraulic cavity (65) is connected to an external pipeline, and a check valve four is arranged in the pipeline; The telescopic joint (69) is connected to an external control valve pipeline, and a fan blade (7) is fixed to the outside of the connecting rod (61), and the fan blade (7) is located on the right side of the slider (4).

6. The heat exchanger aluminum brazing automatic welding line according to claim 5 is characterized by: A temperature sensor is arranged inside the welding chamber (1), and a temperature sensing module is arranged inside the temperature sensor. A torque regulating module is arranged inside the motor (64). The temperature sensing module is electrically connected to the torque regulating module. The temperature sensing module is used to sense the temperature inside the welding chamber (1) during the brazing process. The torque regulating module is used to automatically adjust the torque of the motor (64) according to the brazing environment temperature.

7. The heat exchanger aluminum brazing automatic welding line according to claim 6 is characterized by: The torque adjustment method of the motor (64) is: Q is the real-time torque of the motor (64), Q max is the maximum torque of the motor (64), C is the brazing ambient temperature, C max is the maximum ambient temperature of brazing. When the ambient temperature of brazing is higher, the torque of the motor (64) is greater.

8. A welding method for an automatic aluminum brazing welding line for heat exchangers, according to claim 1, characterized in that: The welding method comprises: Step S1, placing the heat exchanger on the conveying mechanism (2), and conveying it into the welding chamber (1) through the conveying mechanism (2); Step S2, the driving unit controls the slider (4) to move so that the welding mechanism (5) moves to the heat exchanger position; Step S3, the welding mechanism (5) is operated to perform aluminum brazing on the heat exchanger. After the aluminum brazing is completed, the welding mechanism (5) is reset, and the conveying mechanism (2) conveys the welded heat exchanger out; Step S4, repeating steps S1 to S3 to perform continuous aluminum brazing.

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