A chain-type linear automatic brazing machine for air conditioner muffler

Abstract

The invention discloses a chain-type linear automatic brazing machine for air-conditioning silencers. One end of a frame away from a first brazing device and a second brazing device is a loading and unloading area A. A worker positions and fixes the air-conditioning silencer on a tooling fixture distributed and fixed on a circulating drag chain in the loading and unloading area A. The air-conditioning silencer is transported by the circulating drag chain to the first brazing device and the second brazing device, i.e., the welding area B, and the expansion pipe and the air inlet pipe, and the expansion pipe and the air outlet pipe are welded to the air-conditioning silencer on the tooling fixture on a pair of parallel linear conveying sections of the circulating drag chain respectively and synchronously. After the welding is completed, the air-conditioning silencer is linearly transported by the circulating drag chain through a cooling area C, i.e., the linear guide area of ​​the frame, and is cooled. Then, the worker takes out the welded air-conditioning silencer in the loading and unloading area A and installs a new air-conditioning silencer to be welded, thereby realizing continuous and automatic completion of the welding process of the air-conditioning silencer, high welding efficiency, consistent welding quality standards, single-person operation, and reducing production labor costs.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioner muffler production, and in particular relates to air conditioner muffler welding equipment. Background Art

[0002] As attached Figure 1 The air conditioner silencer shown is composed of an expansion tube 100, an air inlet pipe 101 and an air outlet pipe 103. The expansion tube 100 is a stainless steel tube. The upper and lower ends of the expansion tube 100 are contracted to form a necked end. The air inlet pipe 101 is a copper tube and is welded and connected to the upper necked end of the expansion tube 100. The air inlet pipe 101 is bent and extended upward and forms an air inlet pipe end 102 extending vertically upward by a circular arc transition at its end. The air outlet pipe 103 is a copper tube and is welded and connected to the lower necked end of the expansion tube 100. The air outlet pipe 103 extends vertically downward, then bends and extends vertically upward, then bends and extends and forms an air outlet pipe end 104 extending vertically downward at its end.

[0003] At present, the welding production of the above-mentioned air conditioner silencer is completed by 2-3 workers on a turntable equipped with a fixture. One worker is responsible for loading and unloading, and the other workers are responsible for holding the welding gun for welding. In the actual welding production process, the welders work for a long time and will be fatigued. The welding time may be too short, resulting in poor solder penetration inside the weld, too much or too little solder, false welding or uneven temperature. There may even be a situation where the welder forgets to charge nitrogen during the welding operation. The existing welding production method of air conditioner silencers has high skill requirements for operators, is prone to welding defects, and each product must be cooled after welding, which has low production efficiency. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide an air conditioner muffler chain linear automatic brazing machine which can continuously and automatically complete the welding process of the air conditioner muffler, has high welding efficiency, consistent welding quality standards, can be operated by a single person, and helps to reduce production labor costs.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A chain-type linear automatic brazing machine for an air-conditioning muffler comprises a frame, a circulating drag chain is installed on the frame, the circulating drag chain has a pair of parallel linear conveying sections, linear guide rails are installed on the frame corresponding to the linear conveying sections, tooling fixtures are evenly installed on the circulating drag chain, sliders are installed on the tooling fixtures, and the tooling fixtures on the linear conveying sections of the circulating drag chain are connected with the linear guide rails through sliding cooperation of the sliders to realize linear conveying movement; the tooling fixtures comprise a tooling bracket, an expansion tube positioning seat, a shrinking end positioning seat, an air inlet pipe positioning seat, an air outlet pipe positioning seat, an air outlet pipe end positioning seat and an air inlet pipe end positioning seat, and the tooling bracket is fixedly installed The expansion tube positioning seat is arranged at the front end of the tooling bracket, and the expansion tube positioning seat has an expansion tube positioning groove. The expansion tube is positioned and installed in the expansion tube positioning groove. The preferred method is that a positioning bolt is threadedly connected to a groove wall on one side of the expansion tube positioning groove of the expansion tube positioning seat, and the expansion tube is installed in the expansion tube positioning groove and is tightly pressed against the expansion tube by the positioning bolt for positioning and fixing; the shrinking end positioning seat is arranged at the tooling bracket and corresponds to the shrinking end of the expansion tube connected to the air outlet pipe, and the shrinking end positioning seat has a shrinking end positioning groove. The position is installed in the positioning groove of the shrinking end, the air inlet pipe positioning seat is arranged on the tooling bracket and corresponds to the pipe body of the air inlet pipe, the air inlet pipe positioning seat has an air inlet pipe positioning groove, the pipe body of the air inlet pipe is positioned and installed in the air inlet pipe positioning groove, the air outlet pipe positioning seat is arranged on the tooling bracket and corresponds to the pipe body of the air outlet pipe, the air outlet pipe positioning seat has an air outlet pipe positioning groove, the pipe body of the air outlet pipe is positioned and installed in the air outlet pipe positioning groove, the air outlet pipe end positioning seat is arranged on the tooling bracket and corresponds to the air outlet pipe end of the air outlet pipe, the air outlet pipe end positioning seat has an air outlet pipe end positioning groove, the air outlet pipe end of the air outlet pipe is positioned and installed in the air outlet pipe end positioning groove, the air inlet pipe end positioning The seat is arranged on the tooling bracket and corresponds to the intake pipe end of the intake pipe. The intake pipe end positioning seat has an intake pipe end positioning groove, and the intake pipe end of the intake pipe is positioned and installed in the intake pipe end positioning groove; a pair of parallel straight conveying sections corresponding to the circulating drag chain at one end of the frame are respectively installed with a first brazing device for welding and connecting the expansion pipe and the intake pipe, and a second brazing device for welding and connecting the expansion pipe and the outlet pipe, and a nitrogen filling device is respectively installed on the frame corresponding to the first brazing device and the second brazing device, and the nitrogen filling device cooperates with the outlet pipe end positioning seat of the tooling fixture to fill nitrogen into the air conditioner muffler.

[0007] Preferably, the first brazing device includes a first welding torch mechanism and a welding wire feeding mechanism, and the second brazing device includes a second welding torch mechanism and a welding wire feeding mechanism. The first welding torch mechanism and the second welding torch mechanism have the same structure, including a welding torch, a welding torch fixed slider, a welding torch sliding guide rail, a mounting seat, a transmission screw and a servo motor. The welding torch is installed and fixed on the welding torch fixed slider, the welding torch fixed slider is slidably connected to the welding torch sliding guide rail and is threadedly connected to the transmission screw, the welding torch sliding guide rail and the servo motor are installed and fixed on the mounting seat, and the transmission screw is connected to the motor shaft of the servo motor; the welding wire feeding mechanism includes a first welding wire feeding cylinder, a second welding wire feeding cylinder, a welding wire feeding gun seat and a welding wire feeding gun, the piston rod of the first welding wire feeding cylinder is connected to the cylinder body of the second welding wire feeding cylinder, the piston rod of the second welding wire feeding cylinder is connected to the welding wire feeding gun seat, the welding wire feeding gun is installed on the welding wire feeding gun seat, and the piston rods of the first welding wire feeding cylinder and the second welding wire feeding cylinder have vertical movement directions.

[0008] As a further improvement of the present invention, the mounting seat and the cylinder body of the first welding wire feeding cylinder are mounted on a universal adjustment frame, and the universal adjustment frame is fixedly mounted on the frame, and the welding torch and the welding wire feeding angle and position can be adjusted as needed.

[0009] Preferably, the nitrogen charging device includes a cylinder fixing plate, a nitrogen charging cylinder, a nitrogen charging tube fixing plate, a nitrogen charging tube and a suction cup. The cylinder fixing plate is fixed to the frame, the cylinder body of the nitrogen charging cylinder is mounted and fixed to the cylinder fixing plate, the piston rod of the nitrogen charging cylinder is connected to the nitrogen charging tube fixing plate, the nitrogen charging tube is installed on the nitrogen charging tube fixing plate, the tail end of the nitrogen charging tube is connected to the nitrogen source, the suction cup is arranged at the front end of the nitrogen charging tube, and a nitrogen charging passage connecting the nitrogen charging tube and the outlet pipe end of the outlet pipe is arranged on the outlet pipe end positioning seat.

[0010] As another improvement of the present invention, the nitrogen filling airway includes a first airway hole and a second airway hole. The first airway hole is arranged at a positioning seat at the air outlet pipe end and connected to the air outlet pipe end, and the second airway hole is communicated with the first airway hole. The nitrogen filling cylinder is actuated to cause the suction cup to be adsorbed on the positioning seat at the air outlet pipe end and to connect and communicate with the nitrogen filling pipe.

[0011] As a further improvement of the present invention, the slider has a slide groove, roller grooves are arranged on the groove walls on both sides of the slide groove, rollers are installed in the roller grooves, the slider cooperates with the linear guide rail through the slide groove, and is slidably connected to the linear guide rail through the rollers.

[0012] The present invention has the following beneficial effects:

[0013] The chain-type linear automatic brazing machine for air-conditioning mufflers of the present invention positions and fixes the air-conditioning mufflers on a fixed fixture distributed on a circulating drag chain. The air-conditioning mufflers are conveyed by the circulating drag chain and the first brazing device and the second brazing device respectively and synchronously perform welding operations on the expansion pipe and the air inlet pipe, and the expansion pipe and the air outlet pipe of the air-conditioning mufflers on the fixtures on a pair of parallel linear conveying sections of the circulating drag chain. The machine has the characteristics of being able to continuously and automatically complete the welding processing of the air-conditioning mufflers, having high welding efficiency, consistent welding quality standards, being operated by a single person, and being helpful in reducing production labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural schematic diagram of an air conditioning muffler;

[0015] Figure 2 This is an overall structural diagram of an air conditioner muffler chain linear automatic brazing machine of the present invention;

[0016] Figure 3 This is an overall structural diagram of an air conditioner muffler chain-type linear automatic brazing machine of the present invention from another viewing angle;

[0017] Figure 4 This is a structural diagram of a tooling fixture of a chain-type linear automatic brazing machine for an air conditioner muffler of the present invention;

[0018] Figure 5 This is a structural diagram of a tooling fixture of an air conditioner muffler chain-type linear automatic brazing machine of the present invention from another perspective;

[0019] Figure 6 It is a rear view of a tooling fixture of a chain-type linear automatic brazing machine for an air conditioner muffler of the present invention;

[0020] Figure 7 It is a partial enlarged view of the tooling fixture of the chain-type linear automatic brazing machine for air conditioner muffler of the present invention;

[0021] Figure 8 This is a structural diagram of a nitrogen filling device of a chain-type linear automatic brazing machine for an air conditioner muffler of the present invention;

[0022] Fig. 9 This is a structural diagram of a first welding torch mechanism and a second welding torch mechanism of a chain-type linear automatic brazing machine for an air conditioner muffler of the present invention;

[0023] Fig.10 The present invention is a structural diagram of a welding wire feeding mechanism of a chain-type linear automatic brazing machine for an air conditioner muffler.

[0024] In the figure: 1, frame; 2, circulating drag chain; 3, fixture; 4, nitrogen filling device; 5, first welding torch mechanism; 6, welding wire feeding mechanism; 7, second welding torch mechanism; 11, linear guide rail; 12, universal adjustment frame; 100, expansion tube; 101, air inlet pipe; 102, air inlet pipe end; 103, air outlet pipe; 104, air outlet pipe end; 20, linear conveying section; 30, slider; 31, fixture bracket; 32, expansion tube positioning seat; 33, shrink end positioning seat; 34, air inlet pipe positioning seat; 35, air outlet pipe positioning seat; 36, air outlet pipe end positioning seat; 37, air inlet pipe end positioning seat; 301, slide groove; 302, roller groove; 303, roller; 32 1. Expansion tube positioning groove; 322. Positioning bolt; 331. Narrow end positioning groove; 341. Inlet pipe positioning groove; 351. Outlet pipe positioning groove; 361. Outlet pipe end positioning groove; 362. First airway hole; 363. Second airway hole; 371. Inlet pipe end positioning groove; 41. Cylinder fixing plate; 42. Nitrogen charging cylinder; 43. Nitrogen charging tube fixing plate; 44. Nitrogen charging tube; 45. Suction cup; 51. Welding torch; 52. Welding torch fixing slider; 53. Welding torch sliding guide; 54. Mounting seat; 55. Drive screw; 56. Servo motor; 61. First wire feeding cylinder; 62. Second wire feeding cylinder; 63. Wire feeding gun seat; 64. Wire feeding gun. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, so as to more clearly understand the technical ideas claimed for protection of the present invention.

[0026] like Figure 2-10The present invention is a chain-type linear automatic brazing machine for an air conditioner muffler, comprising a frame 1, a circulating drag chain 2 is installed on the frame 1, the circulating drag chain 2 has a pair of parallel linear conveying sections 20, a linear guide rail 11 is installed on the frame 1 corresponding to the linear conveying section 20, a tool fixture 3 is evenly installed on the circulating drag chain 2, a slider 30 is installed on the tool fixture 3, the tool fixture 3 on the linear conveying section 20 of the circulating drag chain 2 is connected with the linear guide rail 11 through the slider 30 to achieve linear conveying movement, the structure of the slider 30 preferably has a slide groove 301, roller grooves 302 are arranged on the groove walls on both sides of the slide groove 301, rollers 303 are installed in the roller groove 302, and the slider 30 cooperates with the linear guide rail 11 through the slide groove 301 , and is slidably connected to the linear guide rail 11 through the roller 303; wherein, the tooling fixture 3 includes a tooling bracket 31, an expansion tube positioning seat 32, a shrinking end positioning seat 33, an air inlet pipe positioning seat 34, an air outlet pipe positioning seat 35, an air outlet pipe end positioning seat 36 and an air inlet pipe end positioning seat 37, the tooling bracket 31 is installed and fixed to the circulating drag chain 2, the slider 30 is fastened and installed on the back of the tooling bracket 31, the expansion tube positioning seat 32 is arranged at the front end of the tooling bracket 31, the expansion tube positioning seat 32 has an expansion tube positioning groove 321, and the expansion tube 100 is positioned and installed in the expansion tube positioning groove 321. The preferred method is that a positioning bolt is threadedly connected to the groove wall on one side of the expansion tube positioning groove 321 of the expansion tube positioning seat 32 322, the expansion tube 100 is installed in the expansion tube positioning groove 321 and is positioned and fixed by the positioning bolt 322 against the expansion tube 100; the shrinking end positioning seat 33 is arranged on the tooling bracket 31 and corresponds to the shrinking end of the expansion tube 100 connected to the outlet pipe 103, the shrinking end positioning seat 33 has a shrinking end positioning groove 331, the shrinking end of the expansion tube 100 connected to the outlet pipe 103 is positioned and installed in the shrinking end positioning groove 331, the intake pipe positioning seat 34 is arranged on the tooling bracket 31 and corresponds to the tube body of the intake pipe 101, the intake pipe positioning seat 34 has an intake pipe positioning groove 341, the tube body of the intake pipe 101 is positioned and installed in the intake pipe positioning groove 341, the outlet pipe positioning seat 35 is arranged on the tooling bracket 31 and corresponds to the tube body of the intake pipe 101. The outlet pipe 103 corresponds to the pipe body, the outlet pipe positioning seat 35 has an outlet pipe positioning groove 351, the pipe body of the outlet pipe 103 is positioned and installed in the outlet pipe positioning groove 351, the outlet pipe end positioning seat 36 is arranged on the tooling bracket 31 and corresponds to the outlet pipe end 104 of the outlet pipe 103, the outlet pipe end positioning seat 36 has an outlet pipe end positioning groove 361, the outlet pipe end 104 of the outlet pipe 103 is positioned and installed in the outlet pipe end positioning groove 361, the inlet pipe end positioning seat 37 is arranged on the tooling bracket 31 and corresponds to the inlet pipe end 102 of the inlet pipe 101, the inlet pipe end positioning seat 37 has an inlet pipe end positioning groove 371, the inlet pipe end 102 of the inlet pipe 101 is positioned and installed in the inlet pipe end positioning groove 371;A pair of parallel straight conveying sections 20 of the circulating drag chain 2 corresponding to one end of the frame 1 are respectively installed with a first brazing device for welding and connecting the expansion tube 100 and the air inlet pipe 101 and a second brazing device for welding and connecting the expansion tube 100 and the air outlet pipe 103. A nitrogen filling device 4 is respectively installed on the frame 1 corresponding to the first brazing device and the second brazing device. The nitrogen filling device 4 cooperates with the air outlet pipe end positioning seat 36 of the fixture 3 to fill nitrogen into the air conditioner muffler. ;

[0027] Among them, the first brazing device includes a first welding torch mechanism 5 and a welding wire feeding mechanism 6, and the second brazing device includes a second welding torch mechanism 7 and a welding wire feeding mechanism 6. The first welding torch mechanism 5 and the second welding torch mechanism 7 have the same structure, including a welding torch 51, a welding torch fixed slider 52, a welding torch sliding guide rail 53, a mounting seat 54, a transmission screw 55 and a servo motor 56. The welding torch 51 is installed and fixed on the welding torch fixed slider 52, the welding torch fixed slider 52 is slidably connected to the welding torch sliding guide rail 53 and is threadedly connected to the transmission screw 55, the welding torch sliding guide rail 53 and the servo motor 56 are installed and fixed on the mounting seat 54, and the transmission screw 55 is connected to the motor shaft of the servo motor 56; the welding wire feeding mechanism 6 includes a first welding wire feeding cylinder 61, a second welding wire feeding cylinder 62, a welding wire feeding gun seat 63 and a welding wire feeding gun 64, the piston rod of the first welding wire feeding cylinder 61 is connected to the cylinder body of the second welding wire feeding cylinder 62, the piston rod of the second welding wire feeding cylinder 62 is connected to the welding wire feeding gun seat 63, the welding wire feeding gun 64 is installed on the welding wire feeding gun seat 63, the piston rods of the first welding wire feeding cylinder 61 and the second welding wire feeding cylinder 62 move in a vertical direction, the welding wire is fed into the welding wire gun 64 and welded through the welding torch 51, and the flame temperature of the welding torch 51 during welding is divided into two stages: heating and insulation. The heating stage is to quickly heat the workpiece to the welding temperature, and the insulation stage is to convert the flame into an insulation flame after the workpiece reaches the welding temperature. At the same time, the welding wire feeding gun 64 starts to feed solder to prevent the flame temperature from being too high, causing the solder to vaporize, causing sand holes in the weld, and affecting the quality of the weld, so as to improve the welding efficiency and ensure the welding quality. The mounting seat 54 and the cylinder body of the first welding wire feeding cylinder 61 are mounted on the universal adjustment frame 12, and the universal adjustment frame 12 is fixedly mounted on the frame 1, and the welding torch 51 and the welding wire feeding angle and position can be adjusted as needed.

[0028] The nitrogen charging device 4 specifically includes a cylinder fixing plate 41, a nitrogen charging cylinder 42, a nitrogen charging pipe fixing plate 43, a nitrogen charging pipe 44 and a suction cup 45. The cylinder fixing plate 41 is fixed to the frame 1, the cylinder body of the nitrogen charging cylinder 42 is fixed to the cylinder fixing plate 41, the piston rod of the nitrogen charging cylinder 42 is connected to the nitrogen charging pipe fixing plate 43, the nitrogen charging pipe 44 is installed on the nitrogen charging pipe fixing plate 43, the tail end of the nitrogen charging pipe 44 is connected to the nitrogen source, the suction cup 45 is arranged at the front end of the nitrogen charging pipe 44, and the outlet pipe end positioning seat 3 6 is provided with a nitrogen filling passage connecting the nitrogen filling pipe 44 and the outlet pipe end 104 of the outlet pipe 103, and the nitrogen filling passage preferably includes a first air passage hole 362 and a second air passage hole 363. The first air passage hole 362 is provided at the outlet pipe end positioning seat 36 and connected with the outlet pipe end 104, and the second air passage hole 363 is communicated with the first air passage hole 362. The nitrogen filling cylinder 42 is actuated to make the suction cup 45 adsorbed on the outlet pipe end positioning seat 36 and make the second air passage hole 363 connected and communicated with the nitrogen filling pipe 44.

[0029] The working mode of the chain-type linear automatic brazing machine for air-conditioning muffler of the present invention is as follows: one end of the frame 1 away from the first brazing device and the second brazing device is a loading and unloading area A, and a worker positions and fixes the air-conditioning muffler on a fixed fixture 3 distributed on the circulating drag chain 2 in the loading and unloading area A, and then the first brazing device and the second brazing device, i.e., the welding area B, synchronously perform welding operations on the expansion pipe 100 and the air inlet pipe 101, and the expansion pipe 100 and the air outlet pipe 103 of the air-conditioning muffler on the fixture 3 on a pair of parallel linear conveying sections 20 of the circulating drag chain 2 respectively through the moving conveyance of the circulating drag chain 2. At this time, the first brazing device welds the expansion pipe 100 and the air inlet pipe 101 of the air-conditioning muffler on one fixture 3, and the second brazing device welds the expansion pipe 101 of the air-conditioning muffler on another fixture 3. 0 and the outlet pipe 103; after the expansion tube 100 and the air inlet pipe 101 are welded to the expansion tube 100 and the air inlet pipe 101 by the first brazing device, the air-conditioning silencer on the same fixture 3 will be transported and moved by the circulating drag chain 2 and turned over so that the welding position of the expansion tube 100 and the air outlet pipe 103 of the air-conditioning silencer on the fixture 3 corresponds to the second brazing device, and then the expansion tube 100 and the air outlet pipe 103 are welded by the second brazing device. After the welding, the air-conditioning silencer is transported in a straight line through the cooling zone C, that is, the linear guide rail 11 area on the frame 1, and then cooled by the worker in the loading and unloading area A, and the new air-conditioning silencer to be welded is installed, thereby realizing continuous and automatic completion of the air-conditioning silencer welding process, high welding efficiency, consistent welding quality standards, single-person operation, and helping to reduce production labor costs.

[0030] For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and concepts described above, and all of these changes and modifications should fall within the protection scope of the claims of the present invention.

Claims

1. A chain-type linear automatic brazing machine for air conditioner mufflers, comprising a frame (1), characterized in that: A circulating drag chain (2) is installed on the frame (1), the circulating drag chain (2) has a pair of parallel straight conveying sections (20), a linear guide rail (11) is installed on the frame (1) corresponding to the straight conveying sections (20), a tooling fixture (3) is evenly installed on the circulating drag chain (2), a slider (30) is installed on the tooling fixture (3), and the tooling fixture (3) on the straight conveying section (20) of the circulating drag chain (2) is connected by sliding cooperation with the linear guide rail (11) through the slider (30) to realize straight conveying movement; The tooling fixture (3) comprises a tooling bracket (31), an expansion tube positioning seat (32), a necking end positioning seat (33), an air inlet pipe positioning seat (34), an air outlet pipe positioning seat (35), an air outlet pipe end positioning seat (36) and an air inlet pipe end positioning seat (37); the tooling bracket (31) is fixedly mounted on the circulating drag chain (2); the slider (30) is fastened to the back of the tooling bracket (31); the expansion tube positioning seat (32) is arranged at the front end of the tooling bracket (31); the expansion tube positioning seat (32) has an expansion tube positioning groove (34). 21), the expansion tube (100) is positioned and installed in the expansion tube positioning groove (321), the shrinking end positioning seat (33) is arranged on the tooling bracket (31) and corresponds to the shrinking end of the expansion tube (100) connected to the air outlet pipe (103), the shrinking end positioning seat (33) has a shrinking end positioning groove (331), the shrinking end of the expansion tube (100) connected to the air outlet pipe (103) is positioned and installed in the shrinking end positioning groove (331), the air inlet pipe positioning seat (34) is arranged on the tooling bracket (31) and corresponds to the pipe body of the air inlet pipe (101), The air inlet pipe positioning seat (34) has an air inlet pipe positioning groove (341), and the body of the air inlet pipe (101) is positioned and installed in the air inlet pipe positioning groove (341). The air outlet pipe positioning seat (35) is arranged on the tooling bracket (31) and corresponds to the body of the air outlet pipe (103). The air outlet pipe positioning seat (35) has an air outlet pipe positioning groove (351), and the body of the air outlet pipe (103) is positioned and installed in the air outlet pipe positioning groove (351). The air outlet pipe end positioning seat (36) is arranged on the tooling bracket (31) and corresponds to the outlet of the air outlet pipe (103). The air outlet pipe end positioning seat (36) corresponds to the air pipe end (104), the air outlet pipe end positioning seat (36) has an air outlet pipe end positioning groove (361), the air outlet pipe end (104) of the air outlet pipe (103) is positioned and installed in the air outlet pipe end positioning groove (361), the air inlet pipe end positioning seat (37) is arranged on the tooling bracket (31) and corresponds to the air inlet pipe end (102) of the air inlet pipe (101), the air inlet pipe end positioning seat (37) has an air inlet pipe end positioning groove (371), the air inlet pipe end (102) of the air inlet pipe (101) is positioned and installed in the air inlet pipe end positioning groove (371); A pair of parallel straight conveying sections (20) of the circulating drag chain (2) located at one end of the frame (1) are respectively installed with a first brazing device for welding and connecting the expansion tube (100) and the air inlet pipe (101) and a second brazing device for welding and connecting the expansion tube (100) and the air outlet pipe (103). A nitrogen filling device (4) is respectively installed on the frame (1) corresponding to the first brazing device and the second brazing device. The nitrogen filling device (4) cooperates with a positioning seat (36) at the air outlet pipe end of the fixture (3) to fill nitrogen into the air conditioner muffler.

2. The air conditioner muffler chain linear automatic brazing machine according to claim 1, characterized in that: The first brazing device comprises a first welding torch mechanism (5) and a welding wire feeding mechanism (6), wherein the first welding torch mechanism (5) comprises a welding torch (51), a welding torch fixing slider (52), a welding torch sliding guide rail (53), a mounting seat (54), a transmission screw (55) and a servo motor (56), wherein the welding torch (51) is fixedly mounted on the welding torch fixing slider (52), the welding torch fixing slider (52) is slidably connected to the welding torch sliding guide rail (53) and is threadedly connected to the transmission screw (55), the welding torch sliding guide rail (53) and the servo motor (56) are fixedly mounted on the mounting seat (54), and the transmission screw (55) is threadedly connected to the welding torch sliding guide rail (53). The moving screw rod (55) is connected to the motor shaft of the servo motor (56); the welding wire feeding mechanism (6) comprises a first welding wire feeding cylinder (61), a second welding wire feeding cylinder (62), a welding wire feeding gun seat (63) and a welding wire feeding gun (64); the piston rod of the first welding wire feeding cylinder (61) is connected to the cylinder body of the second welding wire feeding cylinder (62); the piston rod of the second welding wire feeding cylinder (62) is connected to the welding wire feeding gun seat (63); the welding wire feeding gun (64) is installed on the welding wire feeding gun seat (63); and the piston rods of the first welding wire feeding cylinder (61) and the second welding wire feeding cylinder (62) have vertical movement directions.

3. The air conditioner muffler chain linear automatic brazing machine according to claim 1, characterized in that: The second brazing device comprises a second welding torch mechanism (7) and a welding wire feeding mechanism (6), wherein the second welding torch mechanism (7) comprises a welding torch (51), a welding torch fixing slider (52), a welding torch sliding guide rail (53), a mounting seat (54), a transmission screw (55) and a servo motor (56), wherein the welding torch (51) is fixedly mounted on the welding torch fixing slider (52), the welding torch fixing slider (52) is slidably connected to the welding torch sliding guide rail (53) and is threadedly connected to the transmission screw (55), the welding torch sliding guide rail (53) and the servo motor (56) are fixedly mounted on the mounting seat (54), and the transmission screw (55) is threadedly connected to the welding torch sliding guide rail (53). The moving screw rod (55) is connected to the motor shaft of the servo motor (56); the welding wire feeding mechanism (6) comprises a first welding wire feeding cylinder (61), a second welding wire feeding cylinder (62), a welding wire feeding gun seat (63) and a welding wire feeding gun (64); the piston rod of the first welding wire feeding cylinder (61) is connected to the cylinder body of the second welding wire feeding cylinder (62); the piston rod of the second welding wire feeding cylinder (62) is connected to the welding wire feeding gun seat (63); the welding wire feeding gun (64) is installed on the welding wire feeding gun seat (63); and the piston rods of the first welding wire feeding cylinder (61) and the second welding wire feeding cylinder (62) have vertical movement directions.

4. The air conditioner muffler chain linear automatic brazing machine according to claim 2 or 3, characterized in that: The mounting seat (54) and the cylinder body of the first welding wire feeding cylinder (61) are mounted on a universal adjustment frame (12), and the universal adjustment frame (12) is mounted and fixed on the frame (1).

5. The air conditioner muffler chain linear automatic brazing machine as claimed in claim 1, characterized in that: The nitrogen charging device (4) comprises a cylinder fixing plate (41), a nitrogen charging cylinder (42), a nitrogen charging pipe fixing plate (43), a nitrogen charging pipe (44) and a suction cup (45); the cylinder fixing plate (41) is fixed to the frame (1); the cylinder body of the nitrogen charging cylinder (42) is fixedly mounted on the cylinder fixing plate (41); the piston rod of the nitrogen charging cylinder (42) is connected to the nitrogen charging pipe fixing plate (43); the nitrogen charging pipe (44) is mounted on the nitrogen charging pipe fixing plate (43); the tail end of the nitrogen charging pipe (44) is connected to a nitrogen source; the suction cup (45) is arranged at the front end of the nitrogen charging pipe (44); and a nitrogen charging passage connecting the nitrogen charging pipe (44) and the outlet pipe end (104) of the outlet pipe (103) is arranged on the outlet pipe end positioning seat (36).

6. The chain-type linear automatic brazing machine for air conditioner muffler according to claim 5, characterized in that: The nitrogen filling passage comprises a first air passage hole (362) and a second air passage hole (363); the first air passage hole (362) is arranged on the air outlet pipe end positioning seat (36) and connected with the air outlet pipe end (104); the second air passage hole (363) is communicated with the first air passage hole (362); the nitrogen filling cylinder (42) is operated to make the suction cup (45) adsorbed on the air outlet pipe end positioning seat (36) and make the second air passage hole (363) connect and communicate with the nitrogen filling pipe (44).

7. The air conditioner muffler chain linear automatic brazing machine according to claim 1, characterized in that: A positioning bolt (322) is threadedly connected to a groove wall on one side of the expansion tube positioning groove (321) of the expansion tube positioning seat (32); the expansion tube (100) is installed in the expansion tube positioning groove (321) and the positioning bolt (322) is pressed against the expansion tube (100) for positioning and fixing.

8. The air conditioner muffler chain linear automatic brazing machine according to claim 1, characterized in that: The slider (30) has a slide groove (301), and roller grooves (302) are arranged on the groove walls on both sides of the slide groove (301). Rollers (303) are installed in the roller grooves (302). The slider (30) cooperates with the linear guide rail (11) through the slide groove (301) and is slidably connected to the linear guide rail (11) through the roller (303).

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