Heat exchanger sheet welding equipment and welding method thereof

Abstract

The invention discloses heat exchanger sheet welding equipment and a welding method.The heat exchanger sheet welding equipment comprises a shell with the cross section in a concave shape, a movable buffer plate and a fixed buffer plate, the movable buffer plate and the fixed buffer plate are installed on the inner side of the shell, and the back face of the fixed buffer plate is fixedly connected with the side wall of the shell through a fixed connecting rod; the back face of the movable buffer plate is fixedly connected with the other side wall of the shell through a telescopic connecting rod, and a V-shaped gap is formed between the movable buffer plate and the fixed buffer plate. The back face of the movable buffer plate and the back face of the fixed buffer plate are each provided with a set of transverse damping rollers, all the transverse damping rollers of each set of transverse damping rollers are longitudinally distributed at equal intervals, and all the transverse damping rollers of the two sets of transverse damping rollers are opposite one to one. The heat exchanger sheet is fixed between the movable buffer plate and the fixed buffer plate through the V-shaped gap, manual holding is not needed, the probability that workers are scratched is reduced, and the safety level is higher.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and particularly relates to a welding device and a welding method for heat exchanger thin plates. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. It can transfer heat from a fluid with a higher temperature to a fluid with a lower temperature, so that the temperature of the fluid reaches the specified index of the process, to meet the needs of process conditions. The inside of the heat exchanger is filled with thin plates, and the presence of the thin plates greatly increases the heat transfer area between the hot and cold fluids inside the heat exchanger. According to the principle of heat transfer, the larger the heat transfer area, the more heat is transferred, which can enable the hot and cold fluids to conduct more sufficient heat exchange in a limited space and improve the heat transfer efficiency of the heat exchanger. For example, in a plate heat exchanger, a large number of thin plates are closely arranged, so that the hot and cold fluids flow on both sides of the thin plates, greatly increasing the heat transfer area, thereby achieving efficient heat transfer.

[0003] The size of the heat exchanger thin plate is determined by the specification of the heat exchanger. The larger the specification of the heat exchanger, the larger the corresponding length and width of the thin plate. However, the processing of heat exchanger thin plates has always been a difficult problem in the industry. The thickness of the heat exchanger thin plate is between 0.05 mm and 0.5 mm. After overlapping two thin plates of this thickness and then welding the overlapping edges, the following problems exist: 1. In order to facilitate welding and visually inspect the quality of the weld seam, the two thin plates are placed longitudinally and the upper edges of the two thin plates are the edges to be welded. The thin plates are in this fixed position as the best welding position. On the one hand, the welder does not need to bend down or lower the head, the labor intensity is reduced, and the anti-fatigue effect is significantly better than the welding posture on the ground. On the other hand, the weld seam faces upwards, which is convenient for inspection. However, at present, there is no special longitudinal clamping tool for heat exchanger thin plates. After the large-sized heat exchanger thin plates are placed longitudinally, they are prone to bending and deformation due to gravity, affecting subsequent processing.

[0004] 2. The existing fixing method is to manually hold the edge of the heat exchanger thin plate and lean it against other objects to maintain the longitudinal state. However, the edge of the heat exchanger thin plate is sharp, and there is a high possibility that the employee's hand will be scratched during the holding process, and the safety factor is relatively low.

[0005] 3. In some welding processes, there are a large number of flying "sparks". Here, the "sparks" are high-temperature metal particles. The "sparks" fly onto the surface of the heat exchanger thin plate, damaging the surface of the thin plate, forming black spots and tiny pits, affecting the surface quality of the heat exchanger thin plate.

[0006] 4. Welding generates a large amount of heat, and the heat is highly concentrated near the welding point, while the temperature of the part far from the weld seam is relatively low. The uneven temperature field will cause different degrees of thermal expansion of each part of the heat exchanger thin plate, and the deformation near the weld seam is serious.

[0007] 5. During the welding process, the deformation of the heat exchanger thin sheets causes the edges to be welded of the two thin sheets unable to fit together, increasing the gap between the two sides and affecting the welding quality. Summary of the Invention

[0008] In view of the deficiencies of the prior art, the present invention provides a heat exchanger thin sheet welding device, including a housing with a concave cross-section; an active buffer plate and a fixed buffer plate installed inside the housing. The back of the fixed buffer plate is fixedly connected to the side wall of the housing through a fixed connecting rod, and the back of the active buffer plate is fixedly connected to the other side wall of the housing through a telescopic connecting rod. A V-shaped gap is formed between the active buffer plate and the fixed buffer plate. By horizontally moving the position of the active buffer plate, the width of the V-shaped gap can be adjusted; a set of horizontal damping rollers are respectively provided on the back of the active buffer plate and the back of the fixed buffer plate. All the horizontal damping rollers in each group of horizontal damping rollers are longitudinally equally spaced, and all the horizontal damping rollers of the two groups of horizontal damping rollers are opposite to each other one by one; the central axes at both ends of each horizontal damping roller are rotatably connected to the corresponding active buffer plate or the corresponding fixed buffer plate through side plates, and a part of each horizontal damping roller protrudes from the front of the corresponding active buffer plate or the front of the fixed buffer plate.

[0009] The preferred solution of the heat exchanger thin sheet welding device in the present invention is: a magnetic damping device is provided at one end of each horizontal damping roller, each magnetic damping device is fixed to the outside of the corresponding side plate, and the rotating shaft of the magnetic damping device is coaxially fixed to the central axis of the corresponding horizontal damping roller; the side plates at both ends of the fixed buffer plate are fixedly connected to the housing, and the side plates at both ends of the active buffer plate are respectively movably connected to the housing through telescopic cylinders. The magnetic damping device adjusts the rotational resistance of the corresponding horizontal damping roller, and correspondingly adjusts the adapted rotational resistance according to the size and weight of the heat exchanger thin sheet, so that the speed can be reduced to 0 before the heat exchanger thin sheet lands on the bottom.

[0010] The preferred solution of the heat exchanger thin plate welding equipment in the present invention is as follows: An activity clamping strip extending along the upper edge of the activity buffer plate is fixedly connected to the upper end of the activity buffer plate, and a fixed clamping strip extending along the upper edge of the fixed buffer plate is fixedly connected to the upper end of the fixed buffer plate; The cross-sectional shapes of the activity clamping strip and the fixed clamping strip are both rectangular, the front surface of the activity clamping strip is flush with the front surface of the activity buffer plate, and the front surface of the fixed clamping strip is flush with the front surface of the fixed buffer plate, and the distances between the back surface of the activity clamping strip and the activity buffer plate and between the back surface of the fixed clamping strip and the fixed buffer plate both gradually increase or gradually decrease. Further, outer sliding grooves extending along the length direction are respectively provided on the back surfaces of the activity clamping strip and the fixed clamping strip; A clamping mechanism for clamping the activity clamping strip and the fixed clamping strip is included; The clamping mechanism includes a left bracket and a right bracket. The left bracket is provided with an elastic telescopic shaft facing right, the right bracket is provided with an elastic telescopic shaft facing left, the ends of the two elastic telescopic shafts respectively roll in the two outer sliding grooves through rollers, and a first telescopic motor is connected between the left bracket and the right bracket. By shortening the first telescopic motor, the clamping mechanism clamps the activity clamping strip and the fixed clamping strip. The heat exchanger thin plates are fixed on a rigid fixture for welding, restricting the free deformation of the heat exchanger thin plates. As the welding point moves forward, the degree of deformation of the edge to be welded caused by thermal stress becomes larger and larger. By using the clamping mechanism to move synchronously with the welding gun, the clamping force of the clamping mechanism on the edge to be welded becomes larger and larger, so that the edges to be welded of the two heat exchanger thin plates are tightly clamped and fitted together, and the gap width of the edge to be welded will not increase accordingly, effectively solving the problem of the increase in the weld width during the welding process.

[0011] The preferred solution of the heat exchanger thin plate welding equipment in the present invention is as follows: The materials of the fixed clamping strip and the movable clamping strip are both copper. An inner sliding groove extending along the length direction is provided inside both the fixed clamping strip and the movable clamping strip. Both inner sliding grooves are provided with downward openings. Inside each inner sliding groove, there is an endothermic slider and a preheating slider. The endothermic slider is connected to the left bracket or the right bracket. The endothermic slider and the preheating slider are connected by a second telescopic motor, so that the endothermic slider and the preheating slider move synchronously with the clamping mechanism. In addition, a welding torch holder is provided on the left bracket or the right bracket. The welding torch moves synchronously with the clamping mechanism, ensuring that the welding track coincides with the edge to be welded, and improving the welding quality. Further, the endothermic slider and the preheating slider are respectively provided with a liquid inlet nozzle and a liquid outlet nozzle communicating with the inner cavity. The liquid outlet nozzle of the endothermic slider is communicated with the liquid inlet nozzle of the preheating slider, and the liquid inlet nozzle of the endothermic slider and the liquid outlet nozzle of the preheating slider are communicated with an external cooling system. During the welding process, the endothermic slider and the preheating slider move synchronously with the welding torch. The two endothermic sliders are located on both sides of the welding point, used to absorb a large amount of heat generated at the welding point, dissipate heat in time, and avoid deformation of the heat exchanger thin plate caused by thermal stress concentration. The two preheating sliders transfer the heat during the welding process to the point to be welded, preheat the point to be welded, reduce the temperature difference between the point to be welded and the welding point, and are beneficial to reducing the possibility of deformation of the heat exchanger thin plate.

[0012] The beneficial effects of the heat exchanger thin plate welding equipment in the present invention are as follows: 1. After the two heat exchanger thin plates overlap and are preliminarily fixed, they do not shift. The V-shaped gap is wider at the top and narrower at the bottom, and the width gradually decreases. After the two heat exchanger thin plates are overlapped and fixed, they only need to be placed into the V-shaped gap. During the falling process of the heat exchanger thin plate, it contacts and rubs against the transverse damping roller, and the friction resistance is used to slow down the descent until the speed is zero, avoiding deformation of the heat exchanger thin plate due to impact. The entire heat exchanger thin plate is fixed between the movable buffer plate and the fixed buffer plate, without the need for manual holding, reducing the probability of workers being scratched and having a higher safety level.

[0013] 2. The heat exchanger thin plate is clamped between the movable buffer plate and the fixed buffer plate. Both sides of the heat exchanger thin plate are pressed tightly by multiple transverse damping rollers, that is, each side of the heat exchanger thin plate has multiple support points, and all the support points are evenly distributed, solving the problem of bending deformation of the heat exchanger thin plate due to gravity when placed longitudinally.

[0014] 3. One-tenth of each transverse damping roller is exposed on the front surface of the movable buffer plate or the fixed buffer plate, avoiding direct collision between the heat exchanger thin plate and the transverse damping roller due to excessive exposure of the transverse damping roller. The inclined front surface of the movable buffer plate or the fixed buffer plate plays a dual role of guiding the falling and decelerating of the heat exchanger thin plate, improving the slow-down effect of the heat exchanger thin plate.

[0015] 4. The heat exchanger thin sheet is located between the movable buffer plate and the fixed buffer plate. If there are a large number of splashing sparks during the welding process, the movable buffer plate and the fixed buffer plate play a role in blocking the sparks and protecting the heat exchanger thin sheet.

[0016] The preferred solution of the heat exchanger thin sheet welding equipment in the present invention is: the The present invention also provides a welding method for the heat exchanger thin sheet welding equipment. Based on the above heat exchanger thin sheet welding equipment, the steps are as follows: First, drive the movable buffer plate to move horizontally through the telescopic cylinder, so that the width at the bottom of the V-shaped gap is smaller than the thickness of the thin plate, ensuring that the speed of the heat exchanger thin sheet drops to zero at the lowest point and no bottom contact deformation problem occurs. Then adjust the resistance of all the magnetic damping devices on the same side. From top to bottom, the resistance of all the magnetic damping devices increases in turn, forming a gentle slope deceleration effect to slow down the impact caused by the deceleration speed on the heat exchanger thin sheet. Then move the clamping mechanism to the end with the smallest thickness of the movable clamping strip, and put the two overlapping and fixed thin sheets into the V-shaped gap from top to bottom. The thin sheets decelerate due to contact friction with the transverse damping roller during the falling process until the thin sheets stop and the upper edge of the thin sheets is higher than the movable clamping strip. The upper edge of the thin sheets is the edge to be welded. The longitudinal height of the heat exchanger thin sheet needs to be greater than the depth of the V-shaped gap. After the heat exchanger thin sheet falls to the bottom, the upper edge of the heat exchanger thin sheet just exposes the movable clamping strip and the fixed clamping strip, thus forming the edge to be welded. Subsequently, fix the welding gun on the welding gun clamping frame, and align the welding gun with the edge to be welded. Make the clamping mechanism clamp the movable clamping strip and the fixed clamping strip through the telescopic of the first telescopic motor, and make the preheating slider and the heat absorption slider maintain a set distance through the telescopic of the second telescopic motor. Finally, turn on the external cooling system. The coolant of the external cooling system flows through the heat absorption slider and the preheating slider in turn, turn on the welding gun, and uniformly push the clamping mechanism to move along the edge to be welded, and the preheating slider and the heat absorption slider move synchronously. During the welding process, the heat generated at the welding point is transferred to the heat absorption slider through the fixed clamping strip and the movable clamping strip. The coolant in the heat absorption slider is heated and then flows into the preheating slider. The preheating slider transfers the heat to the next welding point to be welded until the entire edge to be welded is welded.

[0017] The welding method in the present invention has the following advantages: The heat absorption slider and the heat absorption slider move correspondingly as the welding point advances forward. The heat at the welding point where the welding gun is located is concentratedly absorbed, and the absorbed heat is transferred to the welding point to be welded. That is, the excessive heat at the welding point is transferred to the welding point to be welded, greatly accelerating the heat dissipation speed of the welding point, and at the same time preheating the welding point to be welded, reducing the temperature difference between the welding point and the welding point to be welded, thereby reducing the probability of deformation of the heat exchanger thin sheet caused by thermal stress, being beneficial to improving the weld quality and solving the welding problem of the heat exchanger thin sheet. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0019] Figure 1 Structural schematic diagram of the heat exchanger sheet welding equipment in the present invention; Figure 2 is Figure 1 left view of; Figure 3 is Figure 2 isometric view of; Figure 4 is Figure 3 schematic diagram after hiding part of the side plates in; Figure 5 is Figure 4 schematic diagram after hiding the housing in; Figure 6 is Figure 5 partial enlarged view of; Figure 7 Isometric view of the movable clamping strip in the present invention; Figure 8 is Figure 7 cross-sectional view of the position of the heat absorption slider in.

[0020] Reference numerals: housing 1, movable buffer plate 2, fixed buffer plate 3, fixed connecting rod 4, telescopic connecting rod 5, V-shaped gap 6, transverse damping roller 7, side plate 8, notch 9, magnetic damping device 10, telescopic cylinder 11, movable clamping strip 12, fixed clamping strip 13, outer chute 14, left bracket 15, right bracket 16, elastic telescopic shaft 17, roller 18, inner chute 19, opening 20, heat absorption slider 21, preheating slider 22, second telescopic motor 23, welding torch holder 24, liquid inlet nozzle 25, liquid outlet nozzle 26, telescopic rod 27, first telescopic motor 28. Detailed implementation manners

[0021] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention through long-term research and a large number of practices. The following will further explain the technical solution, its implementation process and principle in combination with the accompanying drawings in the embodiments of the present application and specific implementation cases.

[0022] Embodiment 1: As Figures 1 to 3 , Figure 5As shown, the first embodiment provides a heat exchanger sheet welding device, including a shell 1 with a concave cross section, and two pairs of two sides of the shell 1 are connected. It also includes a movable buffer plate 2 and a fixed buffer plate 3 installed on the inner side of the shell 1, the back of the fixed buffer plate 3 is fixedly connected to the side wall of the shell 1 through a fixed connecting rod 4, and the back of the movable buffer plate 2 is fixedly connected to the other side wall of the shell 1 through a telescopic connecting rod 5, and a V-shaped gap 6 is formed between the movable buffer plate 2 and the fixed buffer plate 3, and the width of the V-shaped gap 6 is adjusted by moving the position of the movable buffer plate 2 laterally. Specifically, all telescopic connecting rods 5 are retractable, so that the movable buffer plate 2 can be moved horizontally relative to the fixed buffer plate 3. Before and after the movement, the angle between the fixed buffer plate 3 and the movable buffer plate 2 does not change, only the distance between the two changes. The narrowest part of the V-shaped gap 6 is the bottom, and the minimum gap at the bottom can be adjusted to zero, that is, no gap is left. The top width is the largest, and the V-shaped gap 6 is determined according to the thickness of the heat exchanger sheet, which is not limited in this embodiment. For example, the thickness of the heat exchanger sheet is 0.3 mm, the width of the upper portion of the V-shaped gap 6 is 1 mm, and the width of the bottom portion of the V-shaped gap 6 is 0.2 mm.

[0023] like Figure 5 As shown, in order to achieve the slow fall of the heat exchanger sheet and reduce the impact force on the heat exchanger sheet, in this embodiment, a group of transverse damping rollers 7 are respectively provided on the back of the movable buffer plate 2 and the back of the fixed buffer plate 3, and all the transverse damping rollers 7 of each group of transverse damping rollers 7 are longitudinally evenly spaced, and all the transverse damping rollers 7 of the two groups of transverse damping rollers 7 are opposite to each other. The central axis of each end of each transverse damping roller 7 is rotatably connected with the corresponding movable buffer plate 2 or the corresponding fixed buffer plate 3 through the side plate 8, and a part of each transverse damping roller 7 is exposed on the front of the corresponding movable buffer plate 2 or the front of the fixed buffer plate 3. Specifically, one tenth of each transverse damping roller 7 is exposed on the front of the movable buffer plate 2 or the front of the fixed buffer plate 3, so as to avoid the excessive exposure of the transverse damping roller 7, which may cause the heat exchanger sheet to directly collide with the transverse damping roller 7, and the inclined front of the movable buffer plate 2 or the front of the fixed buffer plate 3 plays a dual role of guiding the heat exchanger sheet to fall and decelerating, thereby improving the slow falling effect of the heat exchanger sheet. A plurality of notches 9 are provided in the middle of each transverse damping roller 7. The purpose of providing the notches 9 is that since the transverse damping roller 7 needs to be exposed on the front of the movable buffer plate 2 and the fixed buffer plate 3, providing the notches 9 can prevent the transverse damping roller 7 from laterally cutting the movable buffer plate 2 and the fixed buffer plate 3. In order to adapt to heat exchanger sheets of different thicknesses, the resistance of the transverse damping roller 7 can be adjusted. The adjustment method of the transverse damping roller 7 is realized by the following structure: like Figure 3 and Figure 4As shown in the figure, a magnetic damper 10 is provided at one end of each transverse damping roller 7. Each magnetic damper 10 is fixed to the outside of the corresponding side plate 8, and the rotating shaft of the magnetic damper 10 is fixedly connected coaxially with the central axis of the corresponding transverse damping roller 7. The side plates 8 at both ends of the fixed buffer plate 3 are fixedly connected to the housing 1, and the side plates 8 at both ends of the movable buffer plate 2 are respectively movably connected to the housing 1 through a telescopic cylinder 11. Specifically, the telescopic cylinder 11 is located in the middle of the side plate 8. Here, the telescopic cylinder 11 refers to a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder. The magnetic damper 10 adjusts the rotational resistance of the corresponding transverse damping roller 7, and adjusts the adapted rotational resistance accordingly according to the size and weight of the heat exchanger thin sheet, so that the speed can be reduced to 0 before the heat exchanger thin sheet lands on the bottom.

[0024] In order to solve the problem of the change in the width of the welding seam, in this embodiment, a movable clamping strip 12 extending along the upper edge of the movable buffer plate 2 is fixedly connected to the upper end of the movable buffer plate 2, and a fixed clamping strip 13 extending along the upper edge of the fixed buffer plate 3 is fixedly connected to the upper end of the fixed buffer plate 3. The cross-sectional shapes of the movable clamping strip 12 and the fixed clamping strip 13 are both rectangular, and the front surface of the movable clamping strip 12 is flush with the front surface of the movable buffer plate 2, and the front surface of the fixed clamping strip 13 is flush with the front surface of the fixed buffer plate 3. Moreover, the distance between the back surface of the movable clamping strip 12 and the movable buffer plate 2 and the distance between the back surface of the fixed clamping strip 13 and the fixed buffer plate 3 both gradually increase or gradually decrease. Further, outer sliding grooves 14 extending along the length direction are respectively provided on the back surfaces of the movable clamping strip 12 and the fixed clamping strip 13.

[0025] This embodiment further includes a clamping mechanism for clamping the movable clamping strip 12 and the fixed clamping strip 13. The clamping mechanism includes a left bracket 15 and a right bracket 16. The left bracket 15 is provided with an elastic telescopic shaft 17 facing right, and the right bracket 16 is provided with an elastic telescopic shaft 17 facing left. The ends of the two elastic telescopic shafts 17 are respectively rolled in the two outer chutes 14 through rollers 18, and a first telescopic motor 28 is connected between the left bracket 15 and the right bracket 16. By shortening the first telescopic motor 28, the clamping mechanism clamps the movable clamping strip 12 and the fixed clamping strip 13. The heat exchanger thin sheet is fixed on a rigid fixture for welding, which restricts the free deformation of the heat exchanger thin sheet. To improve the moving stability of the clamping mechanism, the left bracket 15 and the right bracket 16 are each provided with two elastic telescopic shafts 17, and two rollers 18 are provided at the end of each elastic telescopic shaft 17. That is, the left bracket 15 is rollingly connected to the outer chute 14 through four rollers 18, and the right bracket 16 is also rollingly connected to the outer chute 14 through four rollers 18. As the welding point moves forward, the deformation degree of the edge to be welded due to thermal stress becomes larger and larger. The clamping mechanism moves synchronously with the welding gun, and the clamping force of the clamping mechanism on the edge to be welded becomes larger and larger, so that the edges to be welded of the two heat exchanger thin sheets are tightly clamped and fitted together, and the gap width of the edge to be welded will not increase accordingly, effectively solving the problem of the increase in the weld width during the welding process.

[0026] In order to solve the problem of deformation of the heat exchanger thin sheet caused by thermal stress during the welding process, in this embodiment, the materials of the fixed clamping strip 13 and the movable clamping strip 12 are both copper, and internal chutes 19 extending along the length direction are provided inside the fixed clamping strip 13 and the movable clamping strip 12. Both of the two internal chutes 19 are provided with downward openings 20, and an endothermic slider 21 and a preheating slider 22 are provided inside each internal chute 19. The endothermic slider 21 is connected to the left bracket 15, and the endothermic slider 21 and the preheating slider 22 are connected by a second telescopic motor 23, so that the endothermic slider 21 and the preheating slider 22 move synchronously with the clamping mechanism. In addition, a welding torch holder 24 is provided on the left bracket 15 or the right bracket 16. Since the structures of different types of welding torches are different, the function of the welding torch holder 24 is to hold the welding torch. The specific structure of the welding torch holder 24 varies according to the type of welding torch, so the specific structure of the welding torch holder 24 is not limited in this embodiment and can be selected according to the actual situation. The welding torch holder 24 is not shown in the figure. The welding torch moves synchronously with the clamping mechanism to ensure that the welding track coincides with the edge to be welded, improving the welding quality. Further, the endothermic slider 21 and the preheating slider 22 are respectively provided with a liquid inlet nozzle 25 and a liquid outlet nozzle 26 communicating with the inner cavity. The liquid inlet nozzle 25 and the liquid outlet nozzle 26 both extend out from the opening 20 of the internal chute 19, and at the same time, the liquid inlet nozzle 25 and the liquid outlet nozzle 26 also play a connecting role. Specifically, the liquid inlet nozzle 25 and the liquid outlet nozzle 26 of the endothermic slider 21 are respectively connected to the left bracket 15 through a telescopic rod 27. Similarly, the liquid inlet nozzle 25 and the liquid outlet nozzle 26 of the endothermic slider 21 are respectively connected to the right bracket 16 through a telescopic rod 27. The function of the telescopic rod 27 is to automatically adjust the distance between the endothermic slider 21 and the left bracket 15 and the distance between the endothermic slider 21 and the right bracket 16 during the clamping process of the left bracket 15 and the right bracket 16. The liquid outlet nozzle 26 of the endothermic slider 21 is communicated with the liquid inlet nozzle 25 of the preheating slider 22, and the liquid inlet nozzle 25 of the endothermic slider 21 and the liquid outlet nozzle 26 of the preheating slider 22 are communicated with an external cooling system. In order to improve the heat conduction efficiency, the thickness of the side wall on the front surface of the movable clamping strip 12 and the thickness of the side wall on the front surface of the fixed clamping strip 13 do not exceed 0.5 mm, and the thickness of the other side walls of the movable clamping strip 12 and the fixed clamping strip 13 is not less than 1 mm. During the welding process, the endothermic slider 21 and the preheating slider 22 move synchronously with the welding torch. The two endothermic sliders 21 are located on both sides of the welding point, used to absorb a large amount of heat generated at the welding point, dissipate heat in time, and avoid deformation of the heat exchanger thin sheet caused by thermal stress concentration. The two preheating sliders 22 transfer the heat during the welding process to the point to be welded, preheat the point to be welded, reduce the temperature difference between the point to be welded and the welding point, and are beneficial to reducing the possibility of deformation of the heat exchanger thin sheet.

[0027] Embodiment Two: Embodiment 2 provides a welding method for a heat exchanger thin sheet welding device. Based on the heat exchanger thin sheet welding device of Embodiment 1, the specific method is to drive the movable buffer plate 2 to move horizontally through the telescopic cylinder 11, so that the width at the bottom of the V-shaped gap 6 is smaller than the thickness of the thin sheet, ensuring that the speed of the heat exchanger thin sheet drops to zero when it reaches the lowest point, and no problem of bottom contact deformation occurs. Then adjust the resistance of all the magnetic damping devices 10 on the same side. From top to bottom, the resistance of all the magnetic damping devices 10 increases sequentially, forming a gentle slope deceleration effect to slow down the impact caused by the deceleration speed on the heat exchanger thin sheet. Then move the clamping mechanism to the end with the smallest thickness of the movable clamping strip 12, and place the two overlapped and fixed thin sheets into the V-shaped gap 6 from top to bottom. The thin sheets decelerate due to contact friction with the transverse damping roller 7 during the falling process until the thin sheets stop and the upper edge of the thin sheets is higher than the movable clamping strip 12. The upper edge of the thin sheets is the edge to be welded. The longitudinal height of the heat exchanger thin sheet needs to be greater than the depth of the V-shaped gap 6. After the heat exchanger thin sheet falls to the bottom, the upper edge of the heat exchanger thin sheet just exposes the movable clamping strip 12 and the fixed clamping strip 13, thus forming the edge to be welded. Subsequently, fix the welding gun on the welding gun holder 24, and align the welding gun with the edge to be welded. Make the clamping mechanism clamp the movable clamping strip 12 and the fixed clamping strip 13 by the telescopic movement of the first telescopic motor 28, and keep the preheating slider 22 and the heat absorption slider 21 at a set distance by the telescopic movement of the second telescopic motor 23. Finally, turn on the external cooling system. The coolant of the external cooling system flows through the heat absorption slider 21 and the preheating slider 22 in sequence, turn on the welding gun, and uniformly push the clamping mechanism to move along the edge to be welded, and the preheating slider 22 and the heat absorption slider 21 move synchronously. During the welding process, the heat generated at the welding point is transferred to the heat absorption slider 21 through the fixed clamping strip 13 and the movable clamping strip 12. The coolant in the heat absorption slider 21 is heated and then flows into the preheating slider 22. The preheating slider 22 transfers the heat to the next welding point to be welded until the entire edge to be welded is welded.

[0028] It should be understood that the above embodiments are only used to illustrate the technical concept and features of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or replacements can be made. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A heat exchanger sheet welding device, characterized in that: It includes a shell having a concave cross section; It comprises a movable buffer plate and a fixed buffer plate installed inside the shell, the back side of the fixed buffer plate is fixedly connected to the side wall of the shell through a fixed connecting rod, the back side of the movable buffer plate is fixedly connected to the other side wall of the shell through a telescopic connecting rod, and a V-shaped gap is formed between the movable buffer plate and the fixed buffer plate, and the width of the V-shaped gap can be adjusted by moving the position of the movable buffer plate laterally; A group of transverse damping rollers are respectively provided on the back side of the movable buffer plate and the back side of the fixed buffer plate, all the transverse damping rollers of each group of transverse damping rollers are distributed at equal intervals in the longitudinal direction, and all the transverse damping rollers of the two groups of transverse damping rollers are opposite to each other; the central axes at both ends of each transverse damping roller are rotatably connected to the corresponding movable buffer plate or the corresponding fixed buffer plate through the side plates, and a part of each transverse damping roller is exposed on the front side of the corresponding movable buffer plate or the front side of the fixed buffer plate.

2. A heat exchanger sheet welding device according to claim 1, characterized in that: A magnetic damper is provided at one end of each transverse damping roller, each magnetic damper is fixed to the outer side of the corresponding side plate, and the rotating shaft of the magnetic damper is coaxially fixed with the central axis of the corresponding transverse damping roller; the side plates at both ends of the fixed buffer plate are fixedly connected to the shell, and the side plates at both ends of the movable buffer plate are movably connected to the shell through telescopic cylinders.

3. A heat exchanger sheet welding device according to claim 2, characterized in that: The upper end of the movable buffer plate is fixedly connected to a movable clamping strip extending along the upper side of the movable buffer plate, and the upper end of the fixed buffer plate is fixedly connected to a fixed clamping strip extending along the upper side of the fixed buffer plate; the cross-sectional shape of the movable clamping strip and the cross-sectional shape of the fixed clamping strip are both rectangular, the front side of the movable clamping strip is flush with the front side of the movable buffer plate, and the front side of the fixed clamping strip is flush with the front side of the fixed buffer plate, and the distance between the back side of the movable clamping strip and the movable buffer plate and the distance between the back side of the fixed clamping strip and the fixed buffer plate gradually increase or decrease.

4. A heat exchanger sheet welding device according to claim 3, characterized in that: The back side of the movable clamping strip and the back side of the fixed clamping strip are respectively provided with outer sliding grooves extending along the length direction; It includes a clamping mechanism for clamping a movable clamping strip and a fixed clamping strip; the clamping mechanism includes a left bracket and a right bracket, the left bracket is provided with an elastic telescopic shaft facing right, and the right bracket is provided with an elastic telescopic shaft facing left, the ends of the two elastic telescopic shafts roll in two outer sliding grooves through rollers respectively, and a first telescopic motor is provided between the left bracket and the right bracket to connect, and the first telescopic motor is shortened to enable the clamping mechanism to clamp the movable clamping strip and the fixed clamping strip.

5. A heat exchanger sheet welding device according to claim 4, characterized in that: The material of the fixed clamping strip and the movable clamping strip are both made of copper, and the interior of the fixed clamping strip and the interior of the movable clamping strip are both provided with inner slide grooves extending along the length direction; the two inner slide grooves are both provided with downward openings, and each inner slide groove is provided with a heat absorption slider and a preheating slider inside, the heat absorption slider is connected to the left bracket or the right bracket, and the heat absorption slider and the preheating slider are connected through a second telescopic motor, so that the heat absorption slider and the preheating slider move synchronously with the clamping mechanism.

6. A heat exchanger sheet welding device according to claim 5, characterized in that: The heat absorbing slider and the preheating slider are respectively provided with a liquid inlet and a liquid outlet connected to the inner cavity, the liquid outlet of the heat absorbing slider is connected to the liquid inlet of the preheating slider, and the liquid inlet of the heat absorbing slider and the liquid outlet of the preheating slider are connected to the external cooling system.

7. A heat exchanger sheet welding device according to claim 6, characterized in that: The left bracket or the right bracket is provided with a welding gun clamping frame.

8. A welding method for heat exchanger sheet welding equipment, characterized in that: Based on the heat exchanger sheet welding equipment according to claim 7, the steps are as follows: S1. Use the telescopic cylinder to drive the movable buffer plate to move horizontally so that the width of the bottom of the V-shaped gap is smaller than the thickness of the thin plate; S2. Adjust the resistance of all magnetic dampers on the same side. From top to bottom, the resistance of all magnetic dampers increases in sequence. S3, move the clamping mechanism to the end of the movable clamping strip with the smallest thickness, put the two overlapped and fixed sheets into the V-shaped gap from top to bottom, and the sheets will be decelerated by contact and friction with the transverse damping roller during the falling process until the sheets stop and the upper edge of the sheets is higher than the movable clamping strip, and the upper edge of the sheets is the edge to be welded; S4, fix the welding gun on the welding gun clamping frame, and align the welding gun with the edge to be welded, extend and retract the first telescopic motor to make the clamping mechanism clamp the movable clamping strip and the fixed clamping strip, and extend and retract the second telescopic motor to make the preheating slider and the heat absorption slider maintain a set distance; S5. Turn on the external cooling system, and the coolant of the external cooling system flows through the heat absorbing slider and the preheating slider in sequence. Turn on the welding gun, and push the clamping mechanism to move along the edge to be welded at a constant speed. The preheating slider and the heat absorbing slider move synchronously. S6. During the welding process, the heat generated at the welding point is transferred to the heat absorbing slider through the fixed clamping strip and the movable clamping strip. The coolant in the heat absorbing slider is heated and flows into the preheating slider. The preheating slider transfers the heat to the next welding point to be welded until the welding of the entire edge to be welded is completed.

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