Air conditioner pipeline welding method

Abstract

The invention relates to the field of welding, in particular to an air conditioner pipeline welding method which comprises the following steps that S1, a main pipe and branch pipes of an air conditioner pipe are machined according to design requirements, positioning grooves are formed in branch pipe insertion holes of the main pipe, and welding rings are pre-installed in the positioning grooves; s2, an air conditioner pipeline welding device is installed, and a flame dividing ring with the appropriate size is calculated and selected according to the size of a welding ring of an air conditioner pipe to be welded; the welding efficiency of the air conditioner pipeline is greatly improved, the compactness degree of a welding seam is uniform, and the welding effect is optimized.

Description

Technical Field

[0001] The invention relates to the field of welding, in particular to an air-conditioning pipeline welding method. Background Art

[0002] The copper pipe of the air conditioner is the channel for transferring refrigerant inside the air conditioner, transferring the refrigerant from the outdoor unit to the indoor unit to complete the cooling and heating process of the air conditioner. Figure 3 As shown, 11 is the main pipe of the air conditioner pipe, 12 is the branch pipe of the air conditioner pipe, and 13 is the welding ring for welding between the main pipe and the branch pipe. The main pipe is the transmission channel connecting the indoor unit and the outdoor unit. Its main function is to transport the refrigerant to the outdoor unit to complete the cold and heat exchange with the outside world. Its diameter is relatively large; the branch pipe is used to connect to other components of the air conditioner. It is more in number and smaller in diameter, and is used to achieve the distribution and circulation of the refrigerant inside the air conditioner.

[0003] In the production of traditional air-conditioning pipelines, the main pipe and branch pipe are produced separately. When the main pipe is produced, the pipe body is pre-opened for the branch pipe to be inserted and welded. Before welding, a welding ring is set at the interface between the main pipe and the branch pipe. The welding worker holds the welding gun and aims at the welding ring to complete the welding of the main pipe and each branch pipe in turn. Although this manual handheld point heat source welding method can complete the welding of air-conditioning pipelines, and there are no obvious cracks in the welds seen by the naked eye, the density of the welds varies from a microscopic perspective, and the welding interface cannot achieve the best effect, which indirectly affects the service life of the air-conditioning pipeline. In addition, the efficiency of manual welding is low, so it is urgent to solve this problem. Summary of the invention

[0004] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides an air conditioning pipeline welding method, which greatly improves the welding efficiency of the air conditioning pipeline, and the density of the weld is uniform, and the welding effect is optimized.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An air conditioning pipeline welding method comprises the following steps:

[0007] S1. Process the main pipe and branch pipe of the air conditioning pipe according to the design requirements, open positioning grooves at the insertion holes of the branch pipes of the main pipe, and pre-fill welding rings in each positioning groove;

[0008] S2. Install the air-conditioning pipeline welding device, calculate and select the split flame ring of appropriate size according to the size of the welding ring of the air-conditioning pipe to be welded, and fix the two split rings of the split flame ring on the driving arm; the air-conditioning pipeline welding device includes a welding guide rail, a slide seat is slidably arranged on the welding guide rail, at least one set of conveying tracks is arranged parallel to the welding guide rail, after the air-conditioning pipe is clamped and positioned by the clamping seat, the conveying claws on the conveying track convey the clamping seat to the slide seat for positioning along the conveying track; welding rings are arranged at the interfaces of the main pipe and the branch pipe of the air-conditioning pipe, and the welding rings include a copper welding ring and a coaxially arranged copper welding ring The inner ring is a pre-connected welding ring, and the melting point of the pre-connected welding ring is lower than that of the copper welding ring; the welding gun is arranged on the side of the welding guide rail and is at the same height as the welding ring; semi-annular split rings are arranged on both sides of the welding gun, and the two split rings are in the following working states after being driven by the driving arm: the two split rings are separated, and the welding flame of the welding gun directly heats the welding ring; the two split rings are closed to form a split flame ring coaxially arranged with the welding ring to be welded; an annular split flame channel is opened in the split flame ring, and the welding gun is clamped and positioned after the two split rings are closed, and the outlet of the welding gun is connected to the split flame channel, and the inner ring of the split flame ring is evenly opened with flame split ports along the circumference.

[0009] S3, place the main pipe on the lower clamp seat, arrange its branch pipe insertion holes upward, clamp and position the lower clamp seat by the conveying claws on the second conveying track, and convey the lower clamp seat to the slide seat of the welding track; load each branch pipe on the upper clamp seat, clamp and position the upper clamp seat by the conveying claws of the first conveying track, convey the upper clamp seat to the top of the lower clamp seat, move the upper clamp seat downward, and insert each branch pipe on the upper clamp seat into the branch pipe insertion hole of the main pipe;

[0010] S4, the slide and each conveying clamp move synchronously along the welding track in a straight line, so that each welding ring on the main pipe passes through the welding flame of the welding gun in turn, melts the pre-connected welding ring, and pre-connects the copper welding ring with the main pipe and the branch pipe;

[0011] S5, evacuate the upper clamp seat, and the conveying clamp claw drives the lower clamp seat to retreat along the welding track. During the retreat process, when the welding ring passes through the welding gun, the two split rings are closed and arranged coaxially with the welding ring, so that the welding flame of the welding gun passes through the split flame ring to form a ring-shaped heating on the copper welding ring. After the welding of the copper welding ring is completed, the two split rings of the split flame ring retreat and wait for the welding of the next welding ring;

[0012] S6. After the welding of the air-conditioning pipe is completed, the air-conditioning pipe is removed manually or by a mechanical claw, and the lower clamp seat is reset to complete the welding.

[0013] As a further solution of the present invention: in step S2, the distance r between the flame outlet and the outer ring of the brazing ring is:

[0014]

[0015] c represents the heat capacity of the copper welding ring;

[0016] T represents the melting point of the copper solder ring;

[0017] F represents the cross-sectional area of ​​the copper welding ring;

[0018] ρ represents the density of the copper welding ring;

[0019] n represents the total number of flame outlets;

[0020] d represents the radius of the copper welding ring;

[0021] m represents the thermal conductivity of the copper welding ring;

[0022] q represents the heat flux density at the welding gun outlet;

[0023] s represents the heat loss rate of the welding flame in the flame splitting ring.

[0024] As a further solution of the present invention: in step S1, when processing the main pipe, the branch pipe insertion port of the main pipe is polished, and after the welding ring is pre-filled in the positioning groove, the main pipe is placed in a closed heating chamber, and nitrogen gas at 60° to 75° is introduced into the heating chamber to preheat the main pipe for 20 to 30 minutes.

[0025] As a further solution of the present invention: in step S6, after welding is completed, the air-conditioning pipe is immersed in hot oil at 90° to 105°, and after keeping warm for 40 to 60 minutes, the air-conditioning pipe is dried with hot air at 60° to 75°, and then the interface of the air-conditioning pipe is polished.

[0026] As a further solution of the present invention: the clamping seat is arranged in a split type, including an upper clamping seat for fixing the branch pipe of the air-conditioning pipe and a lower clamping seat for fixing the main pipe of the air-conditioning pipe. The lower clamping seat is provided with a bayonet for supporting the main pipe. The bayonet is in a semi-annular shape with an opening upward, and the size of the bayonet corresponds to the size of the main pipe.

[0027] As a further solution of the present invention: a limiting groove is provided on the upper clamp seat, the limiting groove is a U-shaped opening groove, the groove width of the limiting groove corresponds to the diameter of the branch pipe, after the branch pipe is inserted into the limiting groove from top to bottom, it is abutted and positioned with the upper clamp seat through the limiting ring of the branch pipe body.

[0028] As a further solution of the present invention: a positioning pin is arranged at the bottom of the lower clamp seat, a positioning hole is opened on the slide seat of the welding guide rail, and the lower clamp seat is positioned by plugging the positioning pin into the positioning hole of the slide seat.

[0029] As a further solution of the present invention: the upper clamping seat and the lower clamping seat are respectively provided with an upper chuck and a lower chuck, the conveying track includes a first conveying track and a second conveying track, and the conveying claws on the first conveying track and the second conveying track respectively clamp the upper chuck and the lower chuck to convey the corresponding clamping seat.

[0030] As a further solution of the present invention: the first conveying track and the second conveying track are arranged along the direction parallel to the welding guide rail, and the movement trajectory of each conveying clamp avoids the movement trajectory of the split ring; the driving source of the clamp of the conveying clamp includes a horizontal telescopic power source and a vertical lifting power source, and the telescopic direction of the horizontal telescopic power source is perpendicular to the sliding direction of the slide seat.

[0031] As a further solution of the present invention: the inner ring of the copper welding ring is provided with an annular clamping groove for clamping and positioning the pre-welding ring, and the pre-welding ring is a tin-zinc welding ring.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention has established an automated welding method for air-conditioning pipelines, and has designed a sealed heat insulation design for the main pipes with hot nitrogen before welding, and has carried out heat insulation with hot oil and then dried after welding, so as to optimize the overall performance of the air-conditioning pipes.

[0034] 2. The welding ring of the present invention is of two-stage design. During the welding process, two groups of conveying clamps drive the upper clamp seat and the lower clamp seat to move synchronously along the slide seat. During the movement, the welding rings at each interface pass through the welding flame of the welding gun. The welding flame briefly heats the pre-connected welding ring when passing through, thereby realizing the pre-connection of the branch pipe and the main pipe. After the pre-connection, the clamp seat retreats, and when the welding ring passes through the welding gun, the two split rings close and are coaxially arranged with the welding ring, so that the welding flame of the welding gun forms annular heating on the copper welding ring after passing through the split flame ring, and then melts the copper welding ring to complete the two-stage welding operation. The point heat source welding of the pre-connected welding ring and the annular heat source welding of the copper welding ring are completed with one heat source of the welding gun. The two-stage welding process makes the weld density uniform, the welding effect is optimized, and the entire welding process is automatic with high welding efficiency.

[0035] 3. The split arrangement of the clamping seat of the present invention facilitates the segmented positioning of the main pipe and branch pipe of the air-conditioning pipe. After the pre-connection is completed, the upper clamping seat can be evacuated to wait for the loading of the next batch of branch pipes; the design of the upper limit groove of the upper clamping seat can form a limit support for the limit ring protruding outward of the branch pipe body, and the U-shaped groove design also facilitates subsequent disengagement.

[0036] 4. The present invention designs the distance between the flame splitter and the outer ring of the welding ring to achieve the optimal distance. According to the different sizes of welding rings, flame splitter rings of different sizes are selected, and the welding effect is optimized by adjusting the distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the present invention.

[0038] Figure 2 It is a schematic diagram of the structure of the flame splitting ring in the present invention.

[0039] Figure 3It is a structural schematic diagram of the air conditioning pipe in the present invention.

[0040] Figure 4 It is a schematic diagram of the state when the air conditioning pipe and the clamping seat are separated in the present invention.

[0041] Figure 5 It is a schematic diagram of the air conditioning pipe in the present invention when it is clamped by the clamping seat.

[0042] Figure 6 It is a top view of the upper clamping seat in the present invention.

[0043] Figure 7 It is an enlarged view of the welding surface of the welding ring in the present invention.

[0044] Figure 8 This is an electron microscope scanning morphology image of the welding surface of the welding ring of the present invention.

[0045] In the figure:

[0046] 1. Air conditioning pipe; 11. Main pipe; 111. Positioning groove; 12. Branch pipe;

[0047] 13. Welding ring; 131. Pre-welding ring; 132. Copper welding ring;

[0048] 2. Welding guide rail; 21. Slide seat;

[0049] 3. First conveying track; 4. Second conveying track; 5. Conveying clamp; 6. Welding platform;

[0050] 7. flame splitting ring; 71. splitting ring; 72. flame splitting channel; 73. flame splitting mouth;

[0051] 74. snap ring; 75. drive arm;

[0052] 8. Welding gun; 9. Clamping seat; 91. Lower clamping seat;

[0053] 911, bayonet; 912, positioning pin; 913, lower chuck;

[0054] 92, upper clamping seat; 921, limiting groove; 922, upper clamping head. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0056] See also Figures 1 to 8In an embodiment of the present invention, a method for welding an air conditioning pipeline includes the following steps:

[0057] S1. Process the main pipe 11 and the branch pipe 12 of the air conditioning pipe 1 according to the design requirements, open a positioning groove 111 at the branch pipe insertion hole of the main pipe 11, and pre-fill a welding ring 13 in each positioning groove 111;

[0058] When processing the main pipe 11, the branch pipe insertion port of the main pipe 11 is polished, and after the welding ring 13 is pre-filled in the positioning groove 111, the main pipe 11 is placed in a closed heating chamber, and nitrogen gas at 60° to 75° is introduced into the heating chamber to preheat the main pipe 11 for 20 to 30 minutes.

[0059] S2, installing an air conditioning pipeline welding device, calculating and selecting a flame splitting ring 7 of a suitable size according to the size of the welding ring 13 of the air conditioning pipe 1 to be welded, and fixing the two split rings 71 of the flame splitting ring 7 on the driving arm 75;

[0060] The air conditioning pipeline welding device includes a welding rail 2 arranged on a welding platform 6, and two sets of slides 21 are arranged on the welding rail 2. The two sets of slides 21 can be fixed or separated by a connecting rod. The slide 21 can be provided with an independent power source to drive it to move along the welding rail 2, or slide synchronously with the clamping seat 9.

[0061] The first conveying track 3 and the second conveying track 4 are respectively arranged on both sides of the welding guide rail 2 and are arranged parallel to the welding guide rail 2. The first conveying track 3 and the second conveying track 4 are provided with conveying jaws 5 fixed on the track slide. The conveying jaws 5 have a built-in dual power source, and the jaws of the jaws have two degrees of freedom of horizontal extension and vertical lifting. The conveying jaws 5 are purchased parts, and the structure is the existing technology, so they are not described in detail.

[0062] The conveying jaws 5 on the first conveying track 3 and the second conveying track 4 are used to convey the upper clamp seat 92 and the lower clamp seat 91, respectively. The lower clamp seat 91 is provided with a bayonet 911 for supporting the main pipe 11. The bayonet 911 is in a semi-ring shape with an opening upward, and the size of the bayonet 911 corresponds to the size of the main pipe 11. The upper clamp seat 92 is provided with a limiting groove 921, which is a U-shaped opening groove. The groove width of the limiting groove 921 corresponds to the diameter of the branch pipe 12. After the branch pipe 12 is inserted into the limiting groove 921 from top to bottom, it is abutted against the upper clamp seat 92 through the limiting ring of the branch pipe 12 body. The upper clamp seat 92 and the lower clamp seat 91 are respectively provided with an upper chuck 922 and a lower chuck 913, and the upper chuck 922 and the lower chuck 913 are respectively clamped and positioned by the two conveying jaws 5.

[0063] Positioning holes are provided on the two groups of slide seats 21 , and two groups of positioning pins 912 corresponding to the sizes of the positioning holes are provided at the bottom of the lower clamp seat 91 . The lower clamp seat 91 is inserted and positioned with the positioning holes of the slide seat 21 through the positioning pins 912 .

[0064] Before welding the main pipe 11 of the air conditioning pipe 1, a positioning groove 111 is pre-opened on the outer ring of the branch pipe insertion hole of the pipe body. The welding ring 13 is pre-placed in the positioning groove 111 before being transported through the conveying track. The size of the welding ring 13 matches the size of the positioning groove 111. The welding ring 13 is a combined ring body, including a copper welding ring 132 and a pre-welding ring 131. The melting point of the pre-welding ring 131 needs to be much lower than that of the copper welding ring 132, and it is preferably a tin-zinc welding ring. An annular clamping groove is opened on the inner ring of the copper welding ring 132 for clamping and positioning of the pre-welding ring 131. After the pre-welding ring 131 is clamped into the inner ring of the copper welding ring 132, it is flush with the surface of the copper welding ring 132, and the inner ring size corresponds. The pre-welding ring 131 is arranged adjacent to the positioning groove 111 of the main pipe 11.

[0065] The upper clamp seat 92 is combined with the lower clamp seat 91 to form the clamp seat 9. After each branch pipe 12 is transported to the upper part of the main pipe 11 of the lower clamp seat 91 through the upper clamp seat 92, the transport clamp 5 corresponding to the branch pipe 12 drives the upper clamp seat 92 downward, so that the branch pipe 12 is inserted into the pipe hole of the main pipe 11. At this time, the two groups of transport clamps 5 drive the upper clamp seat 92 and the lower clamp seat 91 to move synchronously along the slide seat 21. During the movement, the welding ring 13 at each interface passes through the welding flame of the welding gun 8. The welding flame briefly heats the pre-connected welding ring 131 when passing through, so as to realize the pre-connection of the branch pipe 12 and the main pipe 11. After completing the pre-connection of all branch pipes 12, the transport clamp 5 first drives the upper clamp seat 92 to move horizontally, so that the branch pipe 12 exits the bayonet 911, and then moves up and down, and returns to the initial position with the first transport track 3 to carry out the next round of loading of the branch pipe 12.

[0066] At the same time, the slide 21 drives the pre-connected main pipe 11 and branch pipe 12 to move along the welding guide rail 2. When one group of branch pipes 12 moves to the muzzle of the welding gun 8, the split rings 71 on both sides of the welding gun 8 move straight and then close together to form a flame splitting ring 7. The flame splitting ring 7 is coaxially arranged with the welding ring 13 to be welded. The inner rings of the two split rings 71 are provided with a semi-annular channel, which forms an annular flame splitting channel 72 after closing. After the two split rings 71 are closed, the welding gun 8 is clamped and positioned, and the clamping surface is sealed. The butt joint surfaces of the two split rings 71 are preferably provided with vermiculite gaskets or graphite sealing rings to achieve sealing; the butt joint ends of the two split rings 71 are provided with clamping rings 74 to clamp the welding gun 8 to prevent the welding gun 8 from moving. After the clamping is completed, the outlet of the welding gun 8 is connected with the flame splitting channel 72. The inner ring of the flame splitting ring 7 is evenly provided with flame splitting ports 73 along the circumferential direction, and the flame outlet direction of the flame splitting ports 73 is arranged along the radial direction of the welding ring. A driving arm 75 is fixed on the split ring 71, and the driving arm 75 is driven by a linear cylinder to drive the split ring 71 to move in a straight line. The angle between the moving trajectory of the split ring 71 and the welding gun 8 is an acute angle. The welding operation of the welding ring 13 is realized through the porous annular flame of the split flame ring 7. After completing the welding of a group of welding rings 13, the split flame ring 7 retreats, and the slide 21 moves along the welding guide rail 2 again until the next group of branch pipes 12 arrives at the outlet of the welding gun 8, and the above operation is repeated to complete the welding operation of each copper welding ring 132. After the welding is completed, the conveying clamp 5 drives the lower clamp 91 to detach from the slide 21, and carries the welded air-conditioning pipe 1 away from the welding platform 6, resets to the initial position, and waits for the next loading process.

[0067] The distance r between the outlet of the flame splitter 73 and the outer ring of the brazing ring 132 is:

[0068]

[0069] c represents the heat capacity of the copper welding ring 132;

[0070] T represents the melting point of the copper brazing ring 132;

[0071] F represents the cross-sectional area of ​​the brazing ring 132;

[0072] ρ represents the density of the copper brazing ring 132;

[0073] n represents the total number of the flame outlets 73;

[0074] d represents the radius of the copper welding ring 132;

[0075] m represents the thermal conductivity of the copper solder ring 132;

[0076] q represents the heat flux density at the outlet of the welding gun 8;

[0077] s represents the heat loss rate of the welding flame in the flame ring 7

[0078] S3, place the main pipe 11 on the lower clamp seat 91, with its branch pipe insertion holes facing upward, clamp and position the lower clamp seat 91 by the conveying clamp 5 on the second conveying track 4, and convey the lower clamp seat 91 to the slide seat 21 of the welding track 2; load each branch pipe 12 onto the upper clamp seat 92, clamp and position the upper clamp seat 92 by the conveying clamp 5 of the first conveying track 3, convey the upper clamp seat 92 to the top of the lower clamp seat 91, move the upper clamp seat 92 downward, and insert each branch pipe 12 on the upper clamp seat 92 into the branch pipe insertion hole of the main pipe 11;

[0079] S4, the slide 21 and each conveying clamp 5 move synchronously along the welding track 2 in a straight line, so that each welding ring 13 on the main pipe 11 passes through the welding flame of the welding gun 8 in sequence, melts the pre-connected welding ring 131, and pre-connects the copper welding ring 132 with the main pipe 11 and the branch pipe 12;

[0080] S5, evacuate the upper clamp seat 92, and the conveying clamp 5 drives the lower clamp seat 91 to retreat along the welding track 2. During the retreat process, when the welding ring 13 passes through the welding gun 8, the two split rings 71 are closed and arranged coaxially with the welding ring 13, so that the welding flame of the welding gun 8 passes through the split flame ring 7 to form an annular heating on the copper welding ring 132. After the welding of the copper welding ring 132 is completed, the two split rings of the split flame ring 7 retreat and wait for the welding of the next welding ring 13;

[0081] S6. After the welding of the air conditioning pipe 1 is completed, the air conditioning pipe 1 is removed manually or by mechanical claws, and the lower clamping seat 91 is reset to complete the welding.

[0082] After welding is completed, the air conditioning pipe 1 is immersed in hot oil at 90° to 105°. After keeping warm for 40 to 60 minutes, the air conditioning pipe 1 is dried with hot air at 60° to 75°, and then the interface of the air conditioning pipe 1 is polished.

[0083] like Figure 8 As shown, by observing the welding area through an electron microscope, the grain distribution in the weld area of ​​the welding ring 13 is uniform and relatively small, and there are fewer large columnar crystals after welding. The strength and toughness of the weld area are much higher than those of traditional single-point heat source welding with a welding gun.

[0084] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0085] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

Claims

1. A method for welding air conditioning pipelines, characterized in that: The steps include: S1. Processing the main pipe (11) and the branch pipe (12) of the air conditioning pipe (1) according to design requirements, opening a positioning groove (111) at the branch pipe insertion hole of the main pipe (11), and pre-filling a welding ring (13) in each positioning groove (111); S2, installing an air conditioning pipeline welding device, calculating and selecting a flame splitting ring (7) of a suitable size according to the size of the welding ring (13) of the air conditioning pipe (1) to be welded, and fixing the two split rings (71) of the flame splitting ring (7) on the driving arm (75); the air conditioning pipeline welding device comprises a welding guide rail (2), a sliding seat (21) is slidably arranged on the welding guide rail (2), at least one group of conveying tracks is arranged parallel to the welding guide rail (2), after the air conditioning pipe (1) is clamped and positioned by the clamping seat (9), the conveying clamping claw (5) on the conveying track conveys the clamping seat (9) along the conveying track to the sliding seat (21) for positioning; a welding ring (13) is arranged at the interface of the main pipe (11) and the branch pipe (12) of the air conditioning pipe (1), and the welding ring (13) comprises a copper welding ring (132) and a pre-welded ring (132) coaxially arranged on the inner ring of the copper welding ring (132) The welding ring (131) has a melting point lower than that of the copper welding ring (132); the welding gun (8) is arranged on the side of the welding guide rail (2) and is located at the same height as the welding ring (13); semi-circular split rings (71) are arranged on both sides of the welding gun (8), and the two split rings (71) are in the following working state after being driven by the driving arm (75): the two split rings (71) are separated, and the welding flame of the welding gun (8) directly heats the welding ring (13); the two split rings (71) are closed to form a split flame ring (7) coaxially arranged with the welding ring (13) to be welded; an annular split flame channel (72) is provided in the split flame ring (7), and the welding gun (8) is clamped and positioned after the two split rings (71) are closed, and the outlet of the welding gun (8) is connected to the split flame channel (72), and the inner ring of the split flame ring (7) is evenly provided with split flame ports (73) along the circumferential direction. S3, place the main pipe (11) on the lower clamp seat (91) so that its branch pipe insertion holes are arranged upward, clamp and position the lower clamp seat (91) through the conveying clamp (5) on the second conveying track (4), and convey the lower clamp seat (91) to the slide seat (21) of the welding track (2); load each branch pipe (12) onto the upper clamp seat (92), clamp and position the upper clamp seat (92) through the conveying clamp (5) of the first conveying track (3), convey the upper clamp seat (92) to the top of the lower clamp seat (91), move the upper clamp seat (92) downward, and insert each branch pipe (12) on the upper clamp seat (92) into the branch pipe insertion hole of the main pipe (11); S4, the slide (21) and each conveying clamp (5) move synchronously in a straight line along the welding track (2), so that each welding ring (13) on the main pipe (11) passes through the welding flame of the welding gun (8) in sequence, melts the pre-connected welding ring (131), and pre-connects the copper welding ring (132) with the main pipe (11) and the branch pipe (12); S5, evacuating the upper clamping seat (92), and the conveying clamping claw (5) drives the lower clamping seat (91) to retreat along the welding track (2). During the retreat process, when the welding ring (13) passes through the welding gun (8), the two split rings (71) are closed and arranged coaxially with the welding ring (13), so that the welding flame of the welding gun (8) passes through the split flame ring (7) to form an annular heating on the copper welding ring (132). After the welding of the copper welding ring (132) is completed, the two split rings of the split flame ring (7) retreat to wait for the welding of the next welding ring (13); S6. After the welding of the air conditioning pipe (1) is completed, the air conditioning pipe (1) is removed manually or by mechanical claws, and the lower clamping seat (91) is reset to complete the welding.

2. The air conditioning pipeline welding method according to claim 1, characterized in that: In step S2, the distance r between the outlet of the flame splitter (73) and the outer ring of the brazing ring (132) is: c represents the heat capacity of the copper brazing ring (132); T represents the melting point of the copper brazing ring (132); F represents the cross-sectional area of ​​the copper soldering ring (132); ρ represents the density of the copper brazing ring (132); n represents the total number of flame outlets (73); d represents the radius of the copper welding ring (132); m represents the thermal conductivity of the copper solder ring (132); q represents the heat flux density at the outlet of the welding gun (8); s represents the heat loss rate of the welding flame in the flame splitting ring (7).

3. The air conditioning pipeline welding method according to claim 1, characterized in that: In step S1, when processing the main pipe (11), the branch pipe insertion port of the main pipe (11) is polished, and after the welding ring (13) is pre-filled in the positioning groove (111), the main pipe (11) is placed in a closed heating chamber, and nitrogen gas at 60° to 75° is introduced into the heating chamber to preheat the main pipe (11) for 20 to 30 minutes.

4. The air conditioning pipeline welding method according to claim 1, characterized in that: In step S6, after welding is completed, the air conditioning pipe (1) is immersed in hot oil at 90° to 105°, and after keeping warm for 40 to 60 minutes, the air conditioning pipe (1) is dried with hot air at 60° to 75°, and then the interface of the air conditioning pipe (1) is polished.

5. An air conditioning pipeline welding method according to any one of claims 1 to 4, characterized in that: The clamping seat (9) is arranged in a split type, comprising an upper clamping seat (92) for fixing the branch pipe (12) of the air-conditioning pipe (1) and a lower clamping seat (91) for fixing the main pipe (11) of the air-conditioning pipe (1); a bayonet (911) for supporting the main pipe (11) is arranged on the lower clamping seat (91); the bayonet (911) is in a semi-annular shape with an opening facing upward, and the size of the bayonet (911) corresponds to the size of the main pipe (11).

6. The air conditioning pipeline welding method according to claim 5, characterized in that: The upper clamp seat (92) is provided with a limiting groove (921), which is a U-shaped opening groove. The groove width of the limiting groove (921) corresponds to the diameter of the branch pipe (12). After the branch pipe (12) is inserted into the limiting groove (921) from top to bottom, the limiting ring of the branch pipe (12) is abutted against the upper clamp seat (92) for positioning.

7. The air conditioning pipeline welding method according to claim 5, characterized in that: A positioning pin (912) is provided at the bottom of the lower clamp seat (91), a positioning hole is provided on the slide seat (21) of the welding guide rail (2), and the lower clamp seat (91) is positioned by plugging the positioning pin (912) into the positioning hole of the slide seat (21).

8. The air conditioning pipeline welding method according to claim 5, characterized in that: The upper clamping seat (92) and the lower clamping seat (91) are respectively provided with an upper clamping head (922) and a lower clamping head (913); the conveying track comprises a first conveying track (3) and a second conveying track (4); the conveying claws (5) on the first conveying track (3) and the second conveying track (4) respectively clamp the upper clamping head (922) and the lower clamping head (913) to convey the corresponding clamping seat.

9. An air conditioning pipeline welding method according to any one of claims 1 to 4, characterized in that: The first conveying track (3) and the second conveying track (4) are both arranged in a direction parallel to the welding guide rail (2), and the movement trajectory of each conveying clamp (5) avoids the movement trajectory of the split ring (71); the driving source of the clamping jaws of the conveying clamp (5) includes a horizontal telescopic power source and a vertical lifting power source, and the telescopic direction of the horizontal telescopic power source is perpendicular to the sliding direction of the slide seat (21).

10. An air conditioning pipeline welding method according to any one of claims 1 to 4, characterized in that: The inner ring of the copper welding ring (132) is provided with an annular clamping groove for clamping and positioning the pre-welding ring (131), and the pre-welding ring (131) is a tin-zinc welding ring.

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