Automatic welding system for U-shaped pipe and straight pipe of evaporator

Abstract

The invention relates to an automatic welding system for a U-shaped pipe and a straight pipe of an evaporator, which comprises an evaporator box body and is characterized by comprising a welding conveying line, a feeding station, a first overturning station, a first welding station, a second overturning station, a second welding station, a third overturning station and a discharging station are sequentially arranged on the welding conveying line. The evaporator pipeline U-shaped pipe and the straight pipe on the evaporator box body are connected in a brazed mode in an assembly line mode, and compared with a traditional manual welding mode, the welding efficiency is improved, and the labor intensity is reduced; the U-shaped pipe on the evaporator box body is welded in a manner that the straight pipe is arranged at the upper part and the U-shaped pipe is arranged at the lower part; aiming at the adoption of a production line type assembly mode, the U-shaped pipe is subjected to flaring improvement on the structure, so that the brazing quality can be improved, the waste of brazing materials is reduced, and the straight pipe and the U-shaped pipe are conveniently and quickly butted.

Description

Technical Field

[0001] This invention relates to the field of evaporator processing technology, and in particular to an automatic welding system for evaporator U-shaped tubes and straight tubes. Background Technology

[0002] The evaporator is equipped with several S-shaped evaporator pipes. The manufacturing process generally involves first embedding straight copper pipes in an array into the evaporator box, with both ends of the copper straight pipes extending out of the evaporator box. Then, U-shaped pipes are used to connect two adjacent copper straight pipes at both ends of the evaporator box to achieve a continuous and interconnected state of the evaporator pipes on the evaporator. However, the conventional connection between the evaporator U-tube and the straight tube is usually done manually by welding, using a simple nesting method and brazing. This method is prone to poor welding quality. The welding between the evaporator U-tube and the straight tube is usually done manually one by one. This welding assembly method has low production efficiency, high labor intensity and high production cost. Therefore, an automatic welding system is needed to realize the rapid assembly and connection of the evaporator U-tube and the straight tube. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic welding system for evaporator U-tubes and straight tubes, which can solve the problems of low efficiency and high cost caused by the traditional manual welding of evaporator U-tubes and straight tubes.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: an automatic welding system for evaporator U-shaped tubes and straight tubes, including an evaporator housing, wherein the side of the evaporator housing is provided with a plurality of mounting holes arranged in a rectangular array to accommodate evaporator tubes passing through, and a straight tube section of the evaporator tube is provided in the mounting holes, with both ends of the straight tube section extending out of the evaporator housing; its innovation lies in: including a welding conveyor line; the welding conveyor line is sequentially provided with a loading station, a first flipping station, a first welding station, a second flipping station, a second welding station, a third flipping station, and a unloading station; The welding conveyor line includes a conveyor frame for supporting and conveying the evaporator housing; The loading station is equipped with a loading forklift, which places the evaporator housing on the conveyor frame, and the straight pipe section on the evaporator housing extends in the same direction as the welding conveyor line. The first flipping station is equipped with a first flipping module, which flips the evaporator box body 90° in the vertical direction so that one end of the straight pipe section on the evaporator box body is in a vertical state for welding the U-shaped pipe on one side of the evaporator box body. A first welding module is provided at the first welding station; the U-shaped tube is welded to the end of a straight pipe section on one side of the evaporator housing through the first welding module; The second flipping station is equipped with a second flipping module. The evaporator box is flipped 180° in the vertical direction by the second flipping module, so that the other end of the straight pipe section on the evaporator box is in a vertical state for welding the U-shaped pipe on the other side of the evaporator box. The second welding station is equipped with a second welding module, and the second welding module has the same structure as the first welding module. The U-shaped tube is welded to the end of the straight pipe section on the other side of the evaporator box through the second welding module. The third flipping station is equipped with a third flipping module, which flips the evaporator housing 90° vertically so that the straight pipe section on the evaporator housing extends in the same direction as the welding conveyor line. The third flipping module has the same structure as the first flipping module. A forklift is provided at the unloading station to remove the evaporator housing with the U-shaped tube welded from the conveyor frame.

[0005] Furthermore, several supporting conveying rollers are provided on both sides of the upper surface of the conveying frame along the extension direction to form a supporting conveying roller track for supporting and conveying the evaporator housing; a limiting baffle is provided on the side of the conveying frame, and a guide roller is provided on the limiting baffle to contact the side of the evaporator housing for limiting and guiding the side of the evaporator housing.

[0006] Furthermore, the first flipping module includes a first flipping base and a first side guard; the outer contours of the first flipping base and the first side guard are both arc-shaped, and arc-shaped teeth are provided on the outer contours for cooperating with a flipping frame with toothed grooves. The flipping frame is provided with a drive motor and a transmission gear. The first flipping base is driven to rotate 90° by the drive motor through the transmission gear on the flipping frame meshing with the arc-shaped teeth and toothed grooves respectively; the upper surface of the first flipping base is horizontal; the first side guard is vertically arranged at one end of the upper surface of the first flipping base and cooperates with the first flipping base to form an L-shaped evaporator box flipping cavity; bullseye ball bearings are provided on the surface of the first flipping base.

[0007] Furthermore, the first welding module includes an evaporator housing positioning frame and a brazing module; both the evaporator housing positioning frame and the brazing module are installed below the welding conveyor line; the evaporator housing positioning frame includes a transverse positioning screw and nut pair and a longitudinal positioning screw and nut pair; both the transverse positioning screw and nut pair and the longitudinal positioning screw and nut pair are driven by independent motors; the transverse positioning screw and nut pair is set on the longitudinal positioning screw and nut pair, and a positioning block is set at the output end of the transverse positioning screw and nut pair. Through the cooperation of the longitudinal positioning screw and nut pair and the transverse positioning screw and nut pair, the positioning block is moved to realize the positioning of the evaporator housing on the welding conveyor line; The brazing module includes an X-axis welding screw and nut pair, a Y-axis welding screw and nut pair, a Z-axis welding screw and nut pair, and a U-shaped tube support structure. The X-axis welding screw and nut pair, the Y-axis welding screw and nut pair, and the Z-axis welding screw and nut pair are assembled to form a three-dimensional moving structure in space. The U-shaped tube support structure is installed on the Z-axis welding screw and nut pair, enabling the U-shaped tube support structure to move and assemble in space below the welding conveyor line.

[0008] Furthermore, the U-shaped tube support structure includes a support base, a brazing induction coil, a spring cylinder, a support spring, and a bracket. The support base has an L-shaped structure and is fixedly installed on the output end of the Z-direction welding screw and nut pair. The support base moves in the space below the welding conveyor line through a three-dimensional moving structure formed by the X-direction, Y-direction, and Z-direction welding screw and nut pairs. The brazing induction coil is installed on the upper surface of the support base, and a brazing area is formed between the brazing induction coil and the upper surface of the support base. The spring cylinder is disposed on the upper surface of the support base, and the support spring is disposed inside the spring cylinder. The bracket is installed on the top of the support spring, and the bracket is supported by the elastic potential energy of the support spring, achieving flexible contact between the bracket and the bottom end of the U-shaped tube.

[0009] Furthermore, the second flipping module includes a second flipping base, a second side baffle, and a third side baffle; the outer contours of the second flipping base, the second side baffle, and the third side baffle are all arc-shaped, and arc-shaped teeth are provided on the arc-shaped outer contours for cooperating with a flipping frame with toothed grooves. The flipping frame is provided with a drive motor and a transmission gear. The transmission gear on the flipping frame meshes with the arc-shaped teeth and toothed grooves respectively, and the second flipping base is driven to rotate 180° under the drive of the drive motor; the upper surface of the second flipping base is horizontal; the second side baffle and the third side baffle are movably connected and disposed at both ends of the upper surface of the second flipping base, and cooperate with the second flipping base to form a U-shaped evaporator box flipping cavity; the surface of the second flipping base is provided with bullseye ball bearings.

[0010] Furthermore, the U-shaped tube has a flared end for embedding the end of the straight tube; the flared end of the U-shaped tube includes a first inclined section and a second inclined section; below the first inclined section is a straight section, and the outer wall of the straight tube and the inner wall of the straight section of the U-shaped tube are connected by an interference fit; the inclination angle of the first inclined section is 0.5°–2°, which facilitates the penetration of the brazing ring after melting, increases the contact surface between the straight tube and the U-shaped tube during welding, and ensures the welding effect; the inclination angle of the second inclined section is 20°–40°, which forms a trumpet-shaped structure to support the brazing ring; it also prevents the liquid from overflowing from the outside after the brazing ring melts, resulting in insufficient brazing depth between the outer wall of the straight tube and the inner wall of the U-shaped tube, and reduces the waste of brazing material.

[0011] The advantages of this invention are: 1) In this invention, the U-shaped tubes and straight tubes of the evaporator pipes on the evaporator housing are brazed together using an assembly line method, which improves welding efficiency and reduces labor intensity compared to the traditional manual welding method. The welding of the U-shaped tubes on the evaporator housing adopts a welding method with the straight tube on top and the U-shaped tube on the bottom. For the assembly method of the production line, the U-shaped tube is improved by flaring its structure, which can improve the quality of brazing, reduce the waste of brazing materials, and facilitate the quick connection between the straight tube and the U-shaped tube. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a schematic diagram of the structure of an automatic welding system for evaporator U-shaped tubes and straight tubes according to the present invention.

[0014] Figure 2 This is a partially enlarged schematic diagram of an automatic welding system for evaporator U-shaped tubes and straight tubes according to the present invention.

[0015] Figure 3 This is a partial side view of an automatic welding system for evaporator U-shaped tubes and straight tubes according to the present invention.

[0016] Figure 4 This is a structural diagram of the first flipping module of an automatic welding system for evaporator U-shaped tubes and straight tubes according to the present invention.

[0017] Figure 5 This is a structural diagram of the second flipping module of an automatic welding system for evaporator U-shaped tubes and straight tubes according to the present invention.

[0018] Figure 6 This is a schematic diagram of the U-tube support structure of an automatic welding system for evaporator U-tubes and straight tubes according to the present invention.

[0019] Figure 7 This is a schematic diagram of the U-shaped tube opening structure of an automatic welding system for evaporator U-shaped tubes and straight tubes according to the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] like Figures 1 to 7 The system shown is an automatic welding system for evaporator U-shaped tubes and straight tubes. It includes an evaporator housing 1, and the side of the evaporator housing 1 is provided with a plurality of mounting holes arranged in a rectangular array to accommodate evaporator tubes. Straight tube sections of evaporator tubes are provided in the mounting holes, and the two ends of the straight tube sections extend out of the evaporator housing 1. It includes a welding conveyor line 2. The welding conveyor line is provided with a loading station 21, a first flipping station 22, a first welding station 23, a second flipping station 24, a second welding station 25, a third flipping station 26, and a unloading station 27 in sequence.

[0023] The welding conveyor line 2 includes a conveyor frame for supporting the conveyor evaporator housing 1.

[0024] A loading forklift is provided at the loading station 21. The evaporator housing 1 is placed on the conveyor frame by the loading forklift, and the straight pipe section on the evaporator housing 1 extends in the same direction as the welding conveyor line.

[0025] A first flipping module 3 is provided at the first flipping station 22. The evaporator box 1 is flipped 90° in the vertical direction by the first flipping module 3, so that one end of the straight pipe section on the evaporator box 1 is in a vertical state for welding the U-shaped pipe on one side of the evaporator box 1.

[0026] A first welding module 4 is provided at the first welding station 23; the U-shaped tube is welded to the end of the straight pipe section on one side of the evaporator housing 1 through the first welding module 4.

[0027] The second flipping station 24 is equipped with a second flipping module 5. The evaporator box 1 is flipped 180° in the vertical direction by the second flipping module 5, so that the other end of the straight pipe section on the evaporator box 1 is in a vertical state for welding the U-shaped pipe on the other side of the evaporator box 1.

[0028] A second welding module is provided at the second welding station 25. The second welding module has the same structure as the first welding module 4. The U-shaped tube is welded to the end of the straight pipe section on the other side of the evaporator box 1 through the second welding module. The third flipping station 26 is equipped with a third flipping module, which flips the evaporator box 90° vertically so that the straight pipe section on the evaporator box 1 extends in the same direction as the welding conveyor line. The third flipping module has the same structure as the first flipping module 3.

[0029] A forklift is installed at the unloading station 27 to remove the evaporator housing with the U-shaped tube welded from the conveyor frame.

[0030] Several supporting conveying rollers are arranged on both sides of the upper surface of the conveyor frame along the extension direction to form a supporting conveying roller track for supporting and conveying the evaporator housing 1; a limiting baffle is provided on the side of the conveyor frame, and a guide roller is provided on the limiting baffle to contact the side of the evaporator housing 1 for limiting and guiding the side of the evaporator housing 1.

[0031] The first flipping module 3 includes a first flipping base 31 and a first side baffle 32. The outer contours of the first flipping base 31 and the first side baffle 32 are both arc-shaped, and arc-shaped teeth are provided on the outer contours for cooperating with a flipping frame with toothed grooves. The flipping frame is provided with a drive motor and a transmission gear. The first flipping base 31 is driven to rotate 90° by the drive motor through the transmission gear on the flipping frame meshing with the arc-shaped teeth and toothed grooves respectively. The upper surface of the first flipping base 31 is horizontal. The first side baffle 32 is vertically arranged at one end of the upper surface of the first flipping base 31 and cooperates with the first flipping base 31 to form an L-shaped flipping cavity of the evaporator box 1. Bullseye ball bearings are provided on the surface of the first flipping base 31.

[0032] The first welding module 4 includes an evaporator housing positioning frame 41 and a brazing module 42. Both the evaporator housing positioning frame 41 and the brazing module 42 are installed below the welding conveyor line. The evaporator housing positioning frame 41 includes a transverse positioning screw and nut pair 411 and a longitudinal positioning screw and nut pair 412. Both the transverse positioning screw and nut pair 411 and the longitudinal positioning screw and nut pair 412 are driven by independent motors. The transverse positioning screw and nut pair 411 is set on the longitudinal positioning screw and nut pair 412, and a positioning block 413 is set at the output end of the transverse positioning screw and nut pair 411. Through the cooperation of the longitudinal positioning screw and nut pair 412 and the transverse positioning screw and nut pair 411, the positioning block 413 is moved to realize the positioning of the evaporator housing 1 on the welding conveyor line. The brazing module 42 includes an X-direction welding screw and nut pair 421, a Y-direction welding screw and nut pair 422, a Z-direction welding screw and nut pair 423, and a U-shaped tube support structure 43. The X-direction welding screw and nut pair 421, the Y-direction welding screw and nut pair 422, and the Z-direction welding screw and nut pair 423 are assembled to form a three-dimensional moving structure in space. The U-shaped tube support structure 34 is installed on the Z-direction welding screw and nut pair 423, realizing the spatial moving assembly of the U-shaped tube support structure 43 below the welding conveyor line.

[0033] The U-shaped tube support structure 43 includes a support base 431, a brazing induction coil 432, a spring cylinder 433, a support spring, and a bracket 434. The support base 431 has an L-shaped structure and is fixedly installed on the output end of the Z-direction welding screw nut pair 423. The support base 431 moves in the space below the welding conveyor line through the three-dimensional moving structure formed by the X-direction welding screw nut pair 421, Y-direction welding screw nut pair 422, and Z-direction welding screw nut pair 423. The brazing induction coil 432 is installed on the upper surface of the support base 431, and a brazing area is formed between the brazing induction coil 432 and the upper surface of the support base 431. The spring cylinder 433 is set on the upper surface of the support base 431, and the support spring is set inside the spring cylinder 433. The bracket 434 is installed on the top of the support spring, and the elastic potential energy of the support spring supports the bracket 434, realizing flexible contact between the bracket 434 and the bottom end of the U-shaped tube.

[0034] The second flipping module 5 includes a second flipping base 51, a second side baffle 52, and a third side baffle 53. The outer contours of the second flipping base 51, the second side baffle 52, and the third side baffle 53 are all arc-shaped, and arc-shaped teeth are provided on the arc-shaped outer contours for cooperating with a flipping frame with toothed grooves. The flipping frame is equipped with a drive motor and a transmission gear. The transmission gear on the flipping frame meshes with the arc-shaped teeth and toothed grooves respectively, and the second flipping base 51 is driven to rotate 180° under the drive of the drive motor. The upper surface of the second flipping base 51 is horizontal. The second side baffle 52 and the third side baffle 53 are movably connected to the two ends of the upper surface of the second flipping base 51, and cooperate with the second flipping base 51 to form a U-shaped evaporator box 1 flipping cavity. Bullseye ball bearings are provided on the surface of the second flipping base 51.

[0035] The U-shaped tube has an flared end for inserting the end of the straight tube. The flared end includes a first inclined section and a second inclined section. Below the first inclined section is a straight section, and the outer wall of the straight tube is connected to the inner wall of the straight section of the U-shaped tube using an interference fit. The inclination angle of the first inclined section is 0.5°–2°. This inclination angle facilitates the penetration of the molten brazing ring, increasing the contact area between the straight tube and the U-shaped tube during welding and ensuring a good welding effect. The inclination angle of the second inclined section is 20°–40°. This inclination angle forms a trumpet-shaped structure to support the brazing ring. It also prevents the molten brazing ring from overflowing from the outside, which could lead to insufficient brazing depth between the outer wall of the straight tube and the inner wall of the U-shaped tube, reducing waste of brazing material.

[0036] The working principle of this invention is as follows: In this invention, the U-shaped tubes and straight tubes of the evaporator pipes on the evaporator housing are brazed together using an assembly line method, which improves welding efficiency and reduces labor intensity compared to the traditional manual welding method; the welding of the U-shaped tubes on the evaporator housing adopts a welding method with the straight tube on top and the U-shaped tube on the bottom; for the assembly method of the production line, the U-shaped tube is structurally improved by flaring, which can improve the quality of brazing, reduce the waste of brazing materials, and facilitate the rapid connection between the straight tube and the U-shaped tube.

[0037] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. An automatic welding system for evaporator U-shaped tubes and straight tubes, comprising an evaporator housing, wherein the side of the evaporator housing is provided with a plurality of mounting holes arranged in a rectangular array to accommodate evaporator tubes passing through, and straight tube sections of evaporator tubes are provided in the mounting holes, with both ends of the straight tube sections extending out of the evaporator housing; characterized in that: It includes a welding conveyor line; the welding conveyor line is sequentially provided with a loading station, a first flipping station, a first welding station, a second flipping station, a second welding station, a third flipping station, and an unloading station; The welding conveyor line includes a conveyor frame for supporting and conveying the evaporator housing; The loading station is equipped with a loading forklift, which places the evaporator housing on the conveyor frame, and the straight pipe section on the evaporator housing extends in the same direction as the welding conveyor line. The first flipping station is equipped with a first flipping module, which flips the evaporator box body 90° in the vertical direction so that one end of the straight pipe section on the evaporator box body is in a vertical state for welding the U-shaped pipe on one side of the evaporator box body. A first welding module is provided at the first welding station; the U-shaped tube is welded to the end of a straight pipe section on one side of the evaporator housing through the first welding module; The second flipping station is equipped with a second flipping module. The evaporator box is flipped 180° in the vertical direction by the second flipping module, so that the other end of the straight pipe section on the evaporator box is in a vertical state for welding the U-shaped pipe on the other side of the evaporator box. The second welding station is equipped with a second welding module, and the second welding module has the same structure as the first welding module. The U-shaped tube is welded to the end of the straight pipe section on the other side of the evaporator box through the second welding module. The third flipping station is equipped with a third flipping module, which flips the evaporator housing 90° vertically so that the straight pipe section on the evaporator housing extends in the same direction as the welding conveyor line. The third flipping module has the same structure as the first flipping module. A forklift is provided at the unloading station to remove the evaporator housing with the U-shaped tube welded from the conveyor frame.

2. The automatic welding system for evaporator U-shaped tubes and straight tubes according to claim 1, characterized in that: Several supporting conveying rollers are arranged on both sides of the upper surface of the conveying frame along the extension direction to form a supporting conveying roller track for supporting and conveying the evaporator box; a limiting baffle is provided on the side of the conveying frame, and a guide roller is provided on the limiting baffle to contact the side of the evaporator box for limiting and guiding the side of the evaporator box.

3. The automatic welding system for evaporator U-shaped tubes and straight tubes according to claim 1, characterized in that: The first flipping module includes a first flipping base and a first side guard; the outer contours of the first flipping base and the first side guard are both arc-shaped, and arc-shaped teeth are provided on the outer contours for cooperating with a flipping frame with toothed grooves. The flipping frame is provided with a drive motor and a transmission gear. The first flipping base is driven to rotate 90° by the drive motor through the transmission gear on the flipping frame meshing with the arc-shaped teeth and toothed grooves respectively. The upper surface of the first flipping base is horizontal. The first side guard is vertically arranged at one end of the upper surface of the first flipping base and cooperates with the first flipping base to form an L-shaped evaporator box flipping cavity. Bullseye ball bearings are provided on the surface of the first flipping base.

4. The automatic welding system for evaporator U-shaped tubes and straight tubes according to claim 1, characterized in that: The first welding module includes an evaporator housing positioning frame and a brazing module; both the evaporator housing positioning frame and the brazing module are installed below the welding conveyor line; the evaporator housing positioning frame includes a transverse positioning screw and nut pair and a longitudinal positioning screw and nut pair; both the transverse positioning screw and nut pair and the longitudinal positioning screw and nut pair are driven by independent motors; the transverse positioning screw and nut pair is set on the longitudinal positioning screw and nut pair, and a positioning block is set at the output end of the transverse positioning screw and nut pair. Through the cooperation of the longitudinal positioning screw and nut pair and the transverse positioning screw and nut pair, the positioning block is moved to realize the positioning of the evaporator housing on the welding conveyor line; The brazing module includes an X-axis welding screw and nut pair, a Y-axis welding screw and nut pair, a Z-axis welding screw and nut pair, and a U-shaped tube support structure. The X-axis welding screw and nut pair, the Y-axis welding screw and nut pair, and the Z-axis welding screw and nut pair are assembled to form a three-dimensional moving structure in space. The U-shaped tube support structure is installed on the Z-axis welding screw and nut pair, enabling the U-shaped tube support structure to move and assemble in space below the welding conveyor line.

5. The automatic welding system for evaporator U-shaped tubes and straight tubes according to claim 4, characterized in that: The U-shaped tube support structure includes a support base, a brazing induction coil, a spring cylinder, a support spring, and a bracket. The support base has an L-shaped structure and is fixedly installed on the output end of the Z-direction welding screw and nut pair. The support base moves in the space below the welding conveyor line through a three-dimensional moving structure formed by the X-direction, Y-direction, and Z-direction welding screw and nut pairs. The brazing induction coil is installed on the upper surface of the support base, and a brazing area is formed between the brazing induction coil and the upper surface of the support base. The spring cylinder is disposed on the upper surface of the support base, and the support spring is disposed inside the spring cylinder. The bracket is installed on the top of the support spring, and the bracket is supported by the elastic potential energy of the support spring, achieving flexible contact between the bracket and the bottom end of the U-shaped tube.

6. The automatic welding system for evaporator U-shaped tubes and straight tubes according to claim 1, characterized in that: The second flipping module includes a second flipping base, a second side baffle, and a third side baffle. The outer contours of the second flipping base, the second side baffle, and the third side baffle are all arc-shaped, and arc-shaped teeth are provided on the arc-shaped outer contours for engaging with a flipping frame with toothed grooves. A drive motor and a transmission gear are provided inside the flipping frame. The transmission gear on the flipping frame meshes with the arc-shaped teeth and toothed grooves respectively, and the second flipping base is driven to rotate 180° under the drive of the drive motor. The upper surface of the second flipping base is horizontal. The second side baffle and the third side baffle are movably connected and located at both ends of the upper surface of the second flipping base, and cooperate with the second flipping base to form a U-shaped evaporator box flipping cavity. Bullseye ball bearings are provided on the surface of the second flipping base.

7. The automatic welding system for evaporator U-shaped tubes and straight tubes according to claim 1, characterized in that: The U-shaped tube has an flared end for embedding the end of the straight tube. The flared end of the U-shaped tube includes a first inclined section and a second inclined section. Below the first inclined section is a straight section, and the outer wall of the straight tube and the inner wall of the straight section of the U-shaped tube are connected by an interference fit. The inclination angle of the first inclined section is 0.5°–2°. This inclination angle facilitates the penetration of the molten brazing ring, increases the contact area between the straight tube and the U-shaped tube during welding, and ensures a good welding effect. The inclination angle of the second inclined section is 20°–40°. This inclination angle forms a trumpet-shaped structure to support the brazing ring. It also prevents the molten brazing ring from overflowing from the outside, which would result in insufficient brazing depth between the outer wall of the straight tube and the inner wall of the U-shaped tube, reducing the waste of brazing material.

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