Blue light welding system for finned tube heat exchanger

Abstract

The blue light welding system for the finned tube heat exchanger comprises a lathe bed, a welding protection unit capable of being opened and closed is arranged in the middle of the lathe bed, a welding area is arranged in the welding protection unit, and feeding and discharging areas are arranged on the two sides of the welding protection unit. The feeding and discharging area is provided with a heat exchanger clamping and moving unit for entering and exiting the welding protection unit. Two groups of welding head adjusting units are arranged in the welding protection unit, welding heads driven by the welding head adjusting units to move for welding are mounted on the welding head adjusting units, each welding head is connected with a corresponding cooling-water machine and a corresponding laser, and the welding head adjusting units, the cooling-water machines and the lasers are connected with a control system for controlling the welding head adjusting units, the cooling-water machines and the lasers to operate. The automatic welding device is high in automation degree, the welding yield is increased, and the welding efficiency is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat exchanger processing, and particularly relates to a blue light welding system for a tube-fin heat exchanger. BACKGROUND

[0002] The tube-fin heat exchanger is a kind of high-efficiency heat exchange equipment, mainly comprising heat exchange tubes and fins. It can be a plurality of heat exchange tubes arranged in parallel, or a plurality of heat exchange tubes arranged in multiple rows, each row having a plurality of heat exchange tubes arranged in parallel. The heat exchange tubes are connected by bent pipes to form a continuous medium space, and the medium space has a liquid inlet and a liquid outlet. The complex pipeline space of the heat exchanger and the small array spacing make the welding of the bent pipes and the heat exchange tubes a difficult point in the manufacturing process of the tube-fin heat exchanger. Specifically, the 4mm small-diameter heat exchanger has the technical difficulties of small tube diameter, thin wall thickness, small array spacing, and poor temperature control of conventional flame welding, which can cause individual welding points to be welded through or to be false-welded, seriously affecting the yield. SUMMARY

[0003] To overcome the shortcomings of the prior art, the application provides a blue light welding system for a tube-fin heat exchanger, which has high automation, improves the welding yield, and has high welding efficiency.

[0004] The technical scheme adopted by the application is as follows: The blue light welding system for the tube-fin heat exchanger comprises a bed body, a weld protection unit that can be opened and closed is arranged in the middle of the bed body, a welding area is arranged in the weld protection unit, an upper and lower material loading and unloading area is arranged on both sides of the weld protection unit, and a heat exchanger clamping and moving unit that enters and exits the weld protection unit is arranged in the upper and lower material loading and unloading area; two groups of welding head adjusting units are arranged in the weld protection unit, a welding head driven by the welding head adjusting units to move for welding is installed on the welding head adjusting units, each welding head is connected with a corresponding water chiller and a laser, and the welding head adjusting units, the water chiller, and the laser are connected with a control system that controls the operation thereof.

[0005] Further, the weld protection unit comprises a fixed unit and a movable unit, the movable unit is movably connected to the fixed unit and the bed body so as to realize the opening and closing of the weld protection unit, laser protection doors are arranged on both sides of the fixed unit and can move back to open or close the access channel of the heat exchanger clamping and moving unit, and the weld protection unit is provided with a smoke processor interface and a blue light observation window.

[0006] Further, a double-door structure for equipment maintenance is arranged at the back of the fixed unit.

[0007] Further, the heat exchanger clamping moving unit comprises two vertically arranged mounting bases, a heat exchanger placing seat capable of being lifted along the Z direction is arranged between the mounting bases, a lifting mechanism for lifting the heat exchanger placing seat is arranged at the lower end of the heat exchanger placing seat, and a plurality of U-tube receivers are arranged on the heat exchanger placing seat.

[0008] Further, the welding head adjusting unit comprises a module mounting base, a Y sliding table is arranged on the module mounting base, the Y sliding table is arranged in parallel with the moving direction of the heat exchanger clamping moving unit, a Z sliding table is arranged on the Y sliding table, an X sliding table is arranged on the Z sliding table, and the welding head is arranged on the X sliding table.

[0009] Further, the welding head is arranged obliquely downward.

[0010] Further, the clamping unit driving unit is arranged across the welding protection unit on the bed body, the heat exchanger clamping moving units are arranged at two ends of the clamping unit driving unit and are driven to move by the clamping unit driving unit, and the clamping unit driving unit is connected with a control system for controlling the operation.

[0011] Further, two groups of the welding head adjusting units are arranged at two sides of the clamping unit driving unit.

[0012] Further, placing units are arranged at two sides of the welding protection unit, the water chiller and the laser are arranged in the corresponding placing units, and the placing units are provided with water chiller air vents.

[0013] Further, the control system comprises a controller, and an operation panel and an image monitoring area are connected to the controller.

[0014] Advantages of the present application: 1. Two groups of lasers can simultaneously perform welding, thereby improving the welding efficiency, the welding head is arranged obliquely, thereby reducing the danger of horizontal laser irradiation, and the welding head can move in the X, Y and Z directions, thereby being suitable for heat exchangers of different lengths.

[0015] 2. The heat exchanger clamping moving unit can alternately operate at two sides through the clamping unit driving unit, thereby improving the working efficiency, the clamping unit driving unit has the characteristics of adjustable stroke and speed and small impact at the end of stroke, and the problem of easy damage of the sealing ring of the long-stroke cylinder is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a left view schematic diagram of the structure of the present application.

[0017] Figure 2 is a right view schematic diagram of the structure of the present application.

[0018] Figure 3 is a top view schematic diagram of the structure of the present application.

[0019] Figure 4 is a back view schematic diagram of the structure of the present application.

[0020] Figure 5 is a front view schematic diagram of the heat exchanger clamping and moving unit of the present application.

[0021] Figure 6 is a back view schematic diagram of the heat exchanger clamping and moving unit of the present application.

[0022] Figure 7 is a schematic diagram of the cooperation between the U tube receiver and the heat exchanger in the heat exchanger clamping and moving unit of the present application.

[0023] Figure 8 is a schematic diagram of the welding head adjusting unit of the present application.

[0024] Figure 9 is a top view schematic diagram of the welding head when welding of the present application.

[0025] Figure 10 is a side view schematic diagram of the welding head when welding of the present application.

[0026] Figure 11 is a schematic diagram of the working process of the present application. DETAILED DESCRIPTION

[0027] The present application will be further described with reference to the specific embodiments, but the present application is not limited to these specific embodiments. Those skilled in the art should recognize that the present application covers all alternatives, modifications and equivalents included within the scope of the claims.

[0028] In the description of the application, it is to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0029] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] Referring to Figures 1-4The embodiment provides a blue light welding system for a tube-fin heat exchanger, which comprises a bed body 1, a weld protection unit 2 arranged in the middle of the bed body 1, a welding area 3 arranged in the weld protection unit, upper and lower material feeding areas arranged on the two sides of the weld protection unit, and heat exchanger clamping moving units 4 arranged in the upper and lower material feeding areas and used for feeding into and out of the weld protection unit 2; two groups of welding head adjusting units 5 are arranged in the weld protection unit 2, welding heads 6 driven by the welding head adjusting units 5 to move for welding are arranged on the welding head adjusting units 5, each welding head 6 is connected with a corresponding water chiller and a laser, and the welding head adjusting units 5, the water chiller and the laser are connected with a control system used for controlling the operation thereof. A clamping unit driving unit 8 is arranged on the bed body 1 and crosses the weld protection unit 2, the heat exchanger clamping moving units 4 are respectively arranged at the two ends of the clamping unit driving unit 8 and are driven to move by the clamping unit driving unit 8, and the clamping unit driving unit 8 is connected with the control system used for controlling the operation thereof.

[0032] The bed body 1 is a mounting base of the whole welding workbench, the bottom of the bed body 1 is provided with machine tool adjusting feet, the height of the machine tool adjusting feet can be adjusted within a certain range, and the machine tool adjusting feet are suitable for installation sites with height difference.

[0033] The weld protection unit 2 comprises a fixed unit 21 and a movable unit 22, the movable unit 22 is movably connected to the fixed unit 21 and the bed body 1, so that the weld protection unit 2 is opened and closed, laser protection doors 23 are arranged on the two sides of the fixed unit 21 and used for moving the heat exchanger clamping moving units 4 in and out of the passageway, the weld protection unit 2 is provided with a smoke processor interface 24 and a blue light observation window. The back of the fixed unit 21 is provided with a double-door structure 25 used for equipment maintenance. Specifically, the main components of the fixed unit 21 and the movable unit 22 are aluminum profiles and sheet metal parts, the movable unit 22 can realize opening and closing movement in the X direction, so that the operator can observe and operate the internal equipment during equipment installation, debugging and maintenance; a slide rail is arranged between the movable unit 22 and the fixed unit 21 and the bed body 1, so that the stability during opening and closing is ensured. The fixed unit 21 is fixedly connected with the bed body 1 by bolts and the like, and does not move during maintenance; the smoke processor interface 24 is arranged on the top of the fixed unit 21, and can be connected with an exhaust duct or a smoke purifier of a factory building according to the actual situation of the factory building; the laser protection doors 23 are arranged on the left and right sides of the fixed unit 21, the laser protection doors 23 are opened when the heat exchanger clamping moving units 4 move along the Y axis, the heat exchanger clamping moving units 4 stop moving after entering the welding area 3, the laser protection doors 23 move along the X axis under the driving of a cylinder or a motor, and the laser protection doors 23, the fixed unit 21 and the movable unit 22 jointly form an enclosed welding area, so that the laser does not harm the operator during welding.

[0034] See Figures 5-7 The heat exchanger clamping and moving unit 4 described in this embodiment includes two vertically arranged mounting seats 41. A heat exchanger placement seat 42, which can be raised and lowered along the Z-axis, is arranged between the mounting seats 41. A lifting mechanism 43 for driving the raising and lowering of the heat exchanger placement seat 42 is installed at the lower end of the heat exchanger placement seat 42. The heat exchanger placement seat 42 is provided with a plurality of U-tube receivers 44. A plurality of crossbeams 45 supporting the back of the heat exchanger 7 are arranged between the mounting seats 41. A limiting plate 46 and a quick-clamp mounting seat 47 are provided on the crossbeams 45. A plurality of X-axis quick clamps 48 that cooperate with the limiting plate 46 to fix the heat exchanger 7 are installed on the quick-clamp mounting seat 47. A Y-axis quick clamp 49 that can position the heat exchanger 7 in the Y-axis is installed on one side of the mounting seat 41. Specifically, a guide rail is provided on the mounting seat 41. The mounting seat 41 provides mounting support for the heat exchanger placement seat 42 and guides the movement in the Z-axis direction through the guide rail. The lifting mechanism 43 adopts a worm gear structure. By rotating the bottom worm gear, the heat exchanger placement seat 42 can move along the guide rail in the Z-axis direction to accommodate heat exchangers 7 of different heights. The heat exchanger placement seat 42 is equipped with several U-tube receivers 44 (the specific number and specifications are selected according to the heat exchanger model) to position the heat exchanger 7 in the Y and Z directions. When placing the heat exchanger 7, the right side of the heat exchanger 7 is aligned with the right-side quick-clamp mounting seat 47, and the back of the heat exchanger 7 is aligned with the limiting plate 46 to ensure consistency in the X and Y directions each time it is placed. Then, it is lowered vertically and positioned by the U-tube receivers 44. The X-axis quick clamps 48 and Y-axis quick clamps 49 are manually moved to clamp the heat exchanger 7. A through-beam sensor 50 is installed on the top of the opposite mounting seat 41 to detect the clamping status of the heat exchanger 7.

[0035] In this embodiment, there are two sets of heat exchanger clamping and moving units 4, both connected in series along the Y-axis via clamping unit drive units 8, allowing them to move synchronously along the Y-axis under driving action. This embodiment... Figures 1-3 The image shows that the heat exchanger clamping and moving unit 4 on the right is located in the welding area 3, and the heat exchanger clamping and moving unit 4 on the left is located in the loading and unloading area on the left. The clamping unit driving unit 8 moves along the positive Y direction to transport the heat exchanger clamping and moving unit 4 on the left to the welding area 3, and the heat exchanger clamping and moving unit 4 on the right to the loading and unloading area on the right. Throughout the entire operation, there is always one set of heat exchanger clamping and moving units 4 located in the welding area 3.

[0036] The clamping unit drive unit 8 described in this embodiment mainly consists of a servo motor, a gear and rack transmission mechanism, and a linear guide rail. It completes the driving and transporting work of the heat exchanger clamping and moving unit 4 in the Y-axis direction. Compared with the previous long-stroke cylinder and linear guide rail, this solution has the characteristics of adjustable stroke and speed, and small impact at the end of the stroke. At the same time, it avoids the problem of easy damage to the sealing ring of the long-stroke cylinder.

[0037] Referring to Figure 8 , the welding head adjusting unit 5 described in the embodiment comprises a module mounting seat 51, a Y sliding table 52 is mounted on the module mounting seat 51, the Y sliding table 52 is arranged in parallel with the moving direction of the heat exchanger clamping moving unit 4, a Z sliding table 53 is mounted on the Y sliding table 52, an X sliding table 54 is mounted on the Z sliding table 53, the welding head 6 is mounted on the X sliding table 54, the welding head 6 is connected with the laser through an optical fiber, and an optical fiber support frame 55 for mounting the optical fiber is arranged on the module mounting seat 51. Since the length of the heat exchanger 7 ranges from 200 to 1000 mm, the width ranges from 120 to 800 mm, and the height (thickness) ranges from 11 to 45 mm. In combination with the arrangement of the welding head 6, the heating scheme and the size parameter range of the heat exchanger, the Z-direction adjustment range of the welding head 6 should meet 200-1000 mm, the Y-axis direction adjustment range is 0-800 mm, and the X-direction adjustment range can meet the requirements of the space position and the copper pipe row spacing at the same time; during the welding process, the heat exchanger clamping moving unit 4 also needs to meet the requirements of the large size range of the heat exchanger, and can be adjusted in the Z-direction and the X-direction. Specifically, the bottom of the module mounting seat 51 is fixed with the bed body 1, and the upper part provides a mounting position for the sliding table module combination; the X, Y and Z sliding table combination carries the welding head 6, and can realize the movement adjustment of the welding head in three directions; the optical fiber support frame 55 supports the optical fiber, so as to prevent the optical fiber from being damaged due to too small bending angle during the movement. The welding head adjusting unit 5 adopts a linear sliding table module combination, and the running speed can reach 500 mm / s. Two groups of the welding head adjusting unit 5 are arranged on the two sides of the clamping unit driving unit 8.

[0038] Referring to Figure 9 , Figure 10 , taking the welding position of the 4-row copper pipe heat exchanger as an example, the middle part of the heat exchanger 7 is taken as a dividing line, the right two rows of copper pipes are divided into the working range of the first welding head 61, and the left two rows of copper pipes are divided into the working range of the first welding head 62. The welding heads 6 of the two lasers can reciprocate along the X and Y directions. According to the working area division, the copper pipes to be welded are marked respectively. The welding heads 6 of the two lasers move upward along the Y direction, and pass through the welding points 1, 2, 3, 4, 5... in turn, so as to ensure that all the copper pipes can contact the laser for welding. During the welding process, there is a problem that the distance between the two rows of copper pipes in the same working area and the focal point of the welding head 6 is different, which can be adjusted through the movement of the X direction of the welding head 6.

[0039] In addition, in order to reduce the risk of horizontal laser irradiation, the two welding heads 6 are at a certain angle with the horizontal direction, so as to ensure oblique downward irradiation, and the welding heads 6 of the two lasers reciprocate along the Z direction, so as to adapt to heat exchangers of different lengths.

[0040] According to the welding mode, the 3-row copper tube heat exchanger is also welded by 2 laser devices; the 2-row and 1-row copper tube heat exchanger can be welded by 1 laser device, in order to improve the working efficiency, 2 laser devices can also be used to simultaneously weld from the two ends of the heat exchanger, and the welding efficiency of the 1-row and 2-row heat exchanger can be improved by 1 times.

[0041] The welding protection unit 2 is provided with a placing unit 9 on both sides, the water chiller and the laser device are arranged in the corresponding placing unit 9, and the placing unit 9 is provided with a water chiller ventilation hole 91, so that ventilation and heat dissipation are facilitated. The control system comprises a controller, and the controller is connected with an operation panel 10 and an image monitoring area 11. Specifically, the placing unit 9 is in a cabinet structure, a frame structure is built by using section bars, the outside is closed by sheet metal parts, the water chiller and the laser device and the like are arranged in the inside, the water chiller ventilation hole 91 is arranged at the top, so that ventilation and heat dissipation are facilitated; the image monitoring area 11 is a liquid crystal display, which is installed on the cabinet surface of the placing unit 9, is used for displaying the image collected by the laser welding CCD, and is used for detecting the welding state in real time, and can also display the state of the whole inside of the welding protection unit; the operation panel 10 is in a cantilever mode, is hung on the fixing unit 21, can be rotated in a certain range with the top installation position as the center, and is convenient for manual operation.

[0042] Referring to Figure 11 When the present application works, the control system is initialized by the operation panel 10, the parameters of the heat exchanger 7 are input, and the position of the sliding table is adjusted. The heat exchanger and the U tube are clamped in the left upper and lower material areas, and whether the clamping is in place is judged. After installation, the clamping unit driving unit 8 drives the left heat exchanger clamping moving unit 4 to enter the welding area 3, and the right heat exchanger clamping moving unit 4 enters the right upper and lower material area to clamp the heat exchanger 7 and the U tube 8; the control system judges whether the left heat exchanger clamping moving unit 4 is in place, after being in place, the welding head adjusting unit 5 moves the welding head 6 to the starting welding point, the laser device lights the copper tube for welding, each welding point is welded according to the welding procedure, after welding is completed, whether the heat exchanger is single-row is judged, if not, the welding head adjusting unit 5 moves the welding head 6 to the next row for continuous welding; if yes, the laser device is turned off, the welding head adjusting unit 5 moves the welding head 6 to the original point, the clamping unit driving unit 8 drives the left heat exchanger clamping moving unit 4 to return to the left upper and lower material area to clamp the heat exchanger 7 and the U tube 8, and the right heat exchanger clamping moving unit 4 enters the welding area for welding. The left and right heat exchanger clamping moving units 4 enter the welding area 3 in turn for welding, until the production is completed.

[0043] The two groups of lasers of the application can simultaneously weld, improve the welding efficiency, and the welding head is arranged obliquely to reduce the risk of horizontal laser irradiation, and the welding head can realize X, Y and Z direction movement to adapt to heat exchangers of different lengths. The heat exchanger clamping and moving unit can alternately operate on both sides through the clamping unit driving unit, improve the work efficiency, and the clamping unit driving unit has the characteristics of adjustable stroke and speed, small impact at the end of stroke, and avoids the problem that the sealing ring of the long-stroke cylinder is easy to be damaged.

Claims

1. A blue light welding system for use in a tube and fin heat exchanger, comprising a bed, characterised in that: The middle of the bed body is provided with an openable welding protection unit, a welding area is arranged in the welding protection unit, and an upper and lower material area is arranged on both sides of the welding protection unit, and a heat exchanger clamping and moving unit for entering and leaving the welding protection unit is arranged in the upper and lower material area.

2. The blue light welding system for a tube and fin heat exchanger of claim 1, wherein: The welding protection unit includes a fixed unit and a movable unit, the movable unit is movably connected to the fixed unit and the bed body to realize the opening and closing of the welding protection unit, laser protection doors are arranged on both sides of the fixed unit to move the heat exchanger clamping and moving unit in and out of the passage, and the welding protection unit is provided with a smoke processor interface and a blue light protection observation window.

3. The blue light welding system for a tube and fin heat exchanger of claim 2, wherein: The back of the fixed unit is provided with a double-door structure for equipment maintenance.

4. The blue light welding system for a tube and fin heat exchanger of claim 1, wherein: The heat exchanger clamping and moving unit includes two vertically arranged mounting seats, a heat exchanger placing seat capable of lifting along the Z direction is arranged between the mounting seats, a lifting mechanism for driving the heat exchanger placing seat to lift is arranged at the lower end of the heat exchanger placing seat, and a plurality of U-tube receivers are arranged on the heat exchanger placing seat.

5. The blue light welding system for a tube and fin heat exchanger of claim 1, wherein: The welding head adjusting unit includes a module mounting seat, a Y sliding table is mounted on the module mounting seat, the Y sliding table is arranged in parallel with the moving direction of the heat exchanger clamping and moving unit, a Z sliding table is mounted on the Y sliding table, an X sliding table is mounted on the Z sliding table, and the welding head is mounted on the X sliding table.

6. The blue light welding system for a tube and fin heat exchanger of claim 1, wherein: The welding head is arranged obliquely downward.

7. The blue light welding system for a tube and fin heat exchanger of claim 1, wherein: The bed body is provided with a clamping unit driving unit transversely crossing the welding protection unit, the heat exchanger clamping and moving units are arranged at both ends of the clamping unit driving unit and are driven to move by the clamping unit driving unit, and the clamping unit driving unit is connected with a control system for controlling its operation.

8. The blue light welding system for a tube and fin heat exchanger of claim 7, wherein: Two groups of welding head adjusting units are arranged on both sides of the clamping unit driving unit.

9. The blue light welding system for a tube and fin heat exchanger of claim 1, wherein: Both sides of the welding protection unit are provided with placing units, the water chiller and the laser are arranged in the corresponding placing units, and the placing units are provided with water chiller ventilation holes.

10. The blue light welding system for a tube and fin heat exchanger of claim 1, wherein: The control system includes a controller, and the controller is connected with an operation panel and an image monitoring area.

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