A laser welding device for plate heat exchanger fins

Abstract

The utility model discloses a kind of plate heat exchange fin laser welding equipment, it includes feeding mechanism, welding support platform and discharging mechanism sequentially arranged along X direction, the positioning and compacting mechanism being positioned and compacted to the workpiece on the welding support platform and being arranged above the welding support platform, the laser welding mechanism for the workpiece on the welding support platform is welded, the cooling device being connected with the welding support platform and the compacting transfer mechanism gradually conveying workpiece from the feeding mechanism to the welding support platform on.The utility model can accurately position, compact workpiece to be welded, and guarantee welding surface quality.

Description

Technical Field

[0001] This utility model relates to the field of sealing welding technology, and in particular to a laser welding device. Background Technology

[0002] Plate heat exchangers rely on advanced welding technologies. Traditional methods such as electric arc welding and resistance welding are inefficient, produce inconsistent quality, and are difficult to automate, making them unsuitable for mass production. In contrast, laser welding offers high quality, high speed, and the ability to weld refractory high-strength steels. Furthermore, it requires no surface treatment, is easily automated, and allows for precise control. Therefore, laser welding is becoming the mainstream welding technology for plate heat exchangers.

[0003] Chinese patent CN223084003U discloses a welding device. After loading, the device first transfers the workpiece to be welded to a first predetermined welding station, clamps it, and performs welding. After welding is completed at the first predetermined welding station, the clamping is released, and the workpiece is transferred to a second predetermined welding station, and so on. After all welding is completed, the workpiece is then transferred back to the initial loading station. This device has a complex predetermined welding station system with poor positioning. The clamping mechanism uses a single pressure plate to control the clamping state, resulting in poor clamping effect. Furthermore, the transfer path is complex, and the final step requires transferring the welded product back to the initial loading station, leading to delays in timely loading and low efficiency.

[0004] Therefore, it is necessary to design a new utility model to solve the above-mentioned technical problems. Utility Model Content

[0005] The main purpose of this invention is to provide a plate heat exchanger laser welding equipment that can accurately position and press the workpiece to be welded, thus ensuring the quality of the welded surface.

[0006] This utility model achieves the above-mentioned objectives through the following technical solution: a plate heat exchanger laser welding equipment includes a feeding mechanism, a welding support platform and a unloading mechanism arranged sequentially along the X direction, a positioning and clamping mechanism arranged above the welding support platform and positioning and clamping the workpiece on the welding support platform, a laser welding mechanism for welding the workpiece on the welding support platform, a cooling device connected to the welding support platform, and a clamping and transferring mechanism for gradually conveying the workpiece from the feeding mechanism to the welding support platform.

[0007] Furthermore, the feeding mechanism and the unloading mechanism are respectively arranged on the left and right sides of the welding support platform. Both include a plurality of conveying rollers arranged along the X direction, a first limiting module and a second limiting module arranged on both sides of the conveying rollers in the Y direction, and a first spacing adjustment module for adjusting the spacing between the first limiting module and the second limiting module; the first limiting module and the second limiting module each include a plurality of rollers arranged along the X direction.

[0008] Furthermore, the pressing and transferring mechanism includes a first driving component, a transfer frame that is driven by the first driving component to move horizontally in the X direction, a second support plate fixedly disposed on the transfer frame and supporting one side of the workpiece in the X direction, a third support plate fixedly disposed on the transfer frame and supporting the other side of the workpiece in the X direction, a first pressing module located above the second support plate, and a second pressing module located above the third support plate.

[0009] Furthermore, both the first pressing module and the second pressing module include a first cylinder fixed on the transfer frame and a first pressure plate driven by the first cylinder to move up and down.

[0010] Furthermore, the welding support platform is located below the positioning and clamping mechanism; the surface of the welding support platform is provided with several air blowing holes for blowing out protective gas.

[0011] Furthermore, the welding support platform is provided with a cooling channel that connects to the cooling device.

[0012] Furthermore, the positioning and pressing mechanism includes a first positioning and pressing module, a second positioning and pressing module that slides along the X direction, a second spacing adjustment module that adjusts the distance between the first positioning and pressing module and the second positioning and pressing module, and a side positioning module.

[0013] Furthermore, both the second positioning and pressing module and the first positioning and pressing module include a second cylinder, a second pressure plate disposed below the second cylinder and driven by the second cylinder to move up and down, and a plurality of elastic floating plates elastically floating below the second pressure plate.

[0014] Furthermore, the second positioning and clamping module also includes a third cylinder fixedly disposed below the second pressure plate and an end limiting plate driven by the third cylinder to move up and down; the elastic floating plate is provided with a slot to avoid the up and down movement of the end limiting plate.

[0015] Furthermore, the second spacing adjustment module includes a crossbeam that slides along the X direction, a second drive assembly disposed on the crossbeam, a pair of drive rods that are rotatably disposed on the crossbeam and rotated by the second drive assembly, two gears disposed at the ends of the pair of drive rods, and a rack that meshes with the gears for transmission; the second positioning and clamping assembly is fixedly disposed on the crossbeam.

[0016] Compared with the prior art, the beneficial effects of this utility model of a laser welding device for plate heat exchangers are as follows: (1) The clamping and transfer mechanism first realizes the initial positioning and transfer of the plate; after arriving at the work station, the positioning and clamping mechanism performs secondary precise positioning (using the side positioning module and the third cylinder module to position the end edge and end face) and flexible clamping (achieved through the elastic mechanism). This dual positioning and clamping mechanism effectively eliminates the cumulative error in the transfer process and ensures that the plate is in an absolutely precise and stable position during welding. (2) The air blowing holes set on the welding support platform can directly blow protective gas (such as inert gas) into the welding area below, effectively isolating the air, inhibiting welding oxidation, spatter and porosity, and improving the quality of the weld. At the same time, the integrated design of the water cooling pipe can quickly remove the welding heat, significantly reduce the heat-affected zone, inhibit welding deformation, and provide double protection for the strength and appearance quality of the welded joint. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of this embodiment; Figure 2 This is a three-dimensional structural diagram of this embodiment (including the protective cover); Figure 3 This is a front view schematic diagram of the feeding mechanism and the unloading mechanism in this embodiment; Figure 4 This is a three-dimensional structural diagram of the clamping and transfer mechanism in this embodiment; Figure 5 This is a front view schematic diagram of the clamping and transfer mechanism in this embodiment; Figure 6 This is a three-dimensional structural diagram of the welding support platform in this embodiment; Figure 7 This is a three-dimensional structural diagram of the positioning and clamping mechanism in this embodiment; Figure 8 This is a three-dimensional structural diagram of the second positioning and clamping module in this embodiment; Figure 9 This is a three-dimensional structural diagram of the second spacing adjustment mechanism in this embodiment; Figure 10 This is a three-dimensional structural diagram of the laser welding mechanism in this embodiment; The diagram is marked as follows: 100-Plate heat exchanger laser welding equipment; 1-Base; 2-Feeding mechanism, 21-Conveying roller, 22-First limit module, 23-Second limit module, 24-First spacing adjustment module, 241-Adjusting screw, 242-Nut sleeve, 243-Adjusting handwheel; 3-Pressure transfer mechanism, 31-First drive assembly, 32-Transfer frame, 33-Second support plate, 34-Third support plate, 35-First pressure module, 36-Second pressure module, 351-First cylinder, 352-First pressure plate; 4-Positioning and clamping mechanism, 41-First positioning and clamping module, 42-Second positioning and clamping module, 43-Second spacing adjustment module, 44-Side positioning module, 411-Positioning and clamping assembly, 4111-Second cylinder, 4112-Second pressure plate, 4113-Elastic floating plate, 41131-Slot, 421-Third cylinder, 422-End limiting plate, 431-Crossbeam, 432-Second drive assembly, 433-Drive rod, 434-Gear, 435-Rack; 5-Laser welding mechanism, 51-Transfer module, 52-Fourth support plate, 53-Laser welding head, 54-Dust extraction pipe; 6-Welding support platform; 61-Air blowing hole; 62-Water cooling pipe; 7- Feeding mechanism; 8-Cooling device; 9-Protective cover; 10-Operation panel. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0019] Example: Please refer to Figures 1-9 This embodiment provides a plate heat exchanger laser welding equipment 100, which includes a base 1, a feeding mechanism 2, a welding support platform 6 and a unloading mechanism 7 arranged sequentially on the base 1 along the X direction, a positioning and clamping mechanism 4 arranged above the welding support platform 6 and positioning and clamping the workpiece on the welding support platform 6, a laser welding mechanism 5 for welding the workpiece on the welding support platform 6, a cooling device 8 connected to the welding support platform 6, a clamping and transfer mechanism 3 for gradually conveying the workpiece from the feeding mechanism 2 to the welding support platform 6, a protective cover 9 covering the main body of the equipment, and an operation panel 10.

[0020] In this embodiment, the workpiece to be welded is a plate heat exchanger. In other embodiments, the workpiece can also be other plates or sheets. In this embodiment, since the area to be welded on the heat exchanger is large, if the heat exchanger is fixed, the laser welding mechanism 5 needs to move a large area to complete the welding of all areas. Moreover, the heat exchanger can only be output as a whole after the laser welding mechanism 5 has finished welding, which increases the unloading time and reduces efficiency. Therefore, to solve this technical problem, this embodiment divides the area to be welded on the heat exchanger into multiple sub-areas, and then uses the pressing and transferring mechanism 3 to drive the heat exchanger to move, so that the multiple sub-areas on the heat exchanger reach the welding station in sequence, and the laser welding mechanism 5 completes the welding of all areas in batches. On the one hand, the laser welding mechanism 5 has a shorter transfer path each time, which improves the welding efficiency. On the other hand, after welding is completed, most areas of the heat exchanger also reach the unloading area, which improves the unloading efficiency and further improves the welding efficiency. In addition, in this embodiment, the heat exchange plate is divided into multiple sub-regions and welded in batches. During welding, the positioning and clamping mechanism 4 is used to clamp the periphery of the sub-region. Compared with clamping the periphery of the entire welding area of ​​the heat exchange plate, the positioning accuracy is higher, thus improving the welding quality.

[0021] To protect the internal components and ensure operational safety, a protective cover 9 is installed on the outside of the main body of the equipment. The protective cover 9 covers the main body of the equipment and has an observation window (not separately marked in the figure) corresponding to the internal operating area. This observation window is made of optically transparent material, allowing operators to observe the internal operating status of the equipment. In addition, an electrical control cabinet (not marked in the figure) is also installed on the protective cover 9 to house relevant electrical control components. One side of the protective cover 9 has an openable door (not separately marked in the figure), which can be opened to provide access to the interior of the equipment, facilitating maintenance or repair operations by operators.

[0022] The loading mechanism 2 and unloading mechanism 7 have identical structures and are located on the left and right sides of the welding support platform 6. Both include several conveying rollers 21 arranged along the X direction, a first limiting module 22 and a second limiting module 23 located on both sides of the conveying rollers 21 in the Y direction, and a first spacing adjustment module 24 for adjusting the distance between the first limiting module 22 and the second limiting module 23. The distance between the first limiting module 22 and the second limiting module 23 is adjusted by the first spacing adjustment module 24 to accommodate the limiting of heat exchanger plates of various sizes and widths. Both the first limiting module 22 and the second limiting module 23 include several rollers arranged along the X direction, which guide and limit the position of the heat exchanger plates on both sides in the Y direction.

[0023] In this embodiment, the first limiting module 22 is fixedly set, and the second limiting module 23 is movably set and driven by the first spacing adjustment module 24 to achieve position adjustment along the Y direction.

[0024] The first spacing adjustment module 24 includes an adjustment screw 241 rotatably mounted on the base 1, a nut sleeve 242 sleeved on the adjustment screw 241, a first support plate (not shown in the figure) fixedly connected to the nut sleeve 242, and an adjustment handwheel 243 fixed to one end of the adjustment screw 241.

[0025] The pressing and transferring mechanism 3 is used to press the plate and accurately transfer each sub-area to be welded on the heat exchanger to the welding station; the welding support platform 6 is set at the welding station to provide strong support for each sub-area to be welded on the heat exchanger. The pressing and transferring mechanism 3 includes a first driving assembly 31 fixed on the base 1, a transfer frame 32 driven by the first driving assembly 31 and moved horizontally along the X direction on the base 1, a second support plate 33 fixed on the transfer frame 32 and supporting one side of the heat exchanger in the X direction, a third support plate 34 fixed on the transfer frame 32 and supporting the other side of the heat exchanger in the X direction, a first pressing module 35 located above the second support plate 33, and a second pressing module 36 located above the third support plate 34.

[0026] The first pressing module 35 and the second pressing module 36 have the same structure and both include a first cylinder 351 fixed on the transfer frame 32 and a first pressure plate 352 driven by the first cylinder 351 to move up and down.

[0027] During operation, the heat exchange plates are supported by the second support plate 33 and the third support plate 34. The first cylinder 351 drives the first pressure plate 352 to move downward to complete the pressing operation. At the same time, under the driving action of the first drive assembly 31, the transfer frame 32 moves horizontally in the X direction, driving the second support plate 33, the third support plate 34 and the heat exchange plates to move synchronously to complete the transfer.

[0028] In this embodiment, the central area of ​​the pressing and transferring mechanism 3 is hollowed out, that is, the area between the second support plate 33 and the third support plate 34 is the hollowed-out area, and the welding support platform 6 is located within this hollowed-out area. By setting the hollowed-out area, after the heat exchange plate is placed on the second support plate 33 and the third support plate 34, the upper and lower surfaces of the area to be welded are unobstructed. Therefore, driven by the pressing and transferring mechanism 3, each sub-area to be welded on the heat exchange plate can gradually move and sit on the welding support platform 6 for batch welding. Furthermore, the pressing and transferring process and the welding process do not interfere with each other, further improving the overall welding efficiency.

[0029] The welding support platform 6 is fixedly connected to the base 1 and located below the positioning and clamping mechanism 4. To ensure welding quality, the surface of the welding support platform 6 is provided with several air blowing holes 61, which blow protective gas into the plate during the welding process. To suppress welding deformation, the welding support platform 6 is provided with cooling channels 62, which cool the plate during welding to ensure welding quality. The cooling channels 62 are connected to an external cooling device 8. After the heat exchanger moves to the welding station, the area to be welded rests on the welding support platform 6. The welding support platform 6 provides bottom support for the area to be welded of the heat exchanger and performs the functions of cooling and blowing protective gas.

[0030] The positioning and clamping mechanism 4 includes a first positioning and clamping module 41 and a second positioning and clamping module 42 mounted on the base 1 and clamping the heat exchanger plate on both sides of the sub-area to be welded in the X direction, a second spacing adjustment module 43 for adjusting the distance between the first positioning and clamping module 41 and the second positioning and clamping module 42, and a side positioning module 44 for limiting the heat exchanger plate on one side in the Y direction.

[0031] In this embodiment, the first positioning and pressing module 41 is fixedly set, and the second positioning and pressing module 42 is movably set and driven by the second spacing adjustment module 43 to adjust its position along the X direction to adapt to heat exchange fins of different specifications.

[0032] The second positioning and clamping module 42 and the first positioning and clamping module 41 have similar structures, both including a plurality of positioning and clamping components 411 arranged along the Y direction. The positioning and clamping component 411 includes a second cylinder 4111, a second pressure plate 4112 disposed below the second cylinder 4111 and driven to move up and down by the second cylinder 4111, and a plurality of elastic floating plates 4113 elastically floating below the second pressure plate 4112.

[0033] The first positioning and clamping module 41 is located near the feeding mechanism 2, and the second positioning and clamping module 42 is located near the unloading mechanism 7. The second positioning and clamping module 42 also includes a third cylinder 421 fixedly disposed below the second pressure plate 4112 and an end limiting plate 422 driven by the third cylinder 421 to move up and down. The elastic floating plate 4113 is provided with a slot 41131 to avoid the up and down movement of the end limiting plate 422. Its size is adapted to the cross-sectional size of the end limiting plate 422, so that the end limiting plate 422 passes through the slot 41131 and extends into the underside of the elastic floating plate 4113, so as to limit the end of the heat exchanger plate.

[0034] In this embodiment, since the heat exchange plate has a large area, on the one hand, in order to make the heat exchange plate be pressed evenly and fully on both sides in the X direction, multiple second cylinders 4111 and multiple elastic floating plates 4113 are provided; on the other hand, in order to prevent the pressing part from deforming during the welding process of the heat exchange plate and to ensure the welding quality, elastic floating plates 4113 are used to flexibly press the heat exchange plate.

[0035] The second spacing adjustment module 43 includes a crossbeam 431 slidably mounted on the base 1 along the X direction, a second drive assembly 432 fixedly mounted on the crossbeam 431, a pair of drive rods 433 rotatably mounted on the crossbeam 431 and driven to rotate by the second drive assembly 432, two gears 434 disposed at the ends of the pair of drive rods 433, and a rack 435 fixedly mounted on the base 1 and meshing with the gears 434. The second positioning and clamping module 42 is fixedly mounted on the crossbeam 431.

[0036] Under the driving action of the second drive assembly 432, the drive rod 433 drives the gear 434 to rotate. Under the meshing transmission of the gear 434 and the rack 435, the crossbeam 431 is driven to move horizontally in the X direction, and the second positioning and pressing module 42 moves accordingly, realizing the adjustment of the distance between the first positioning and pressing module 41 and the second positioning and pressing module 42.

[0037] The working process of the positioning and clamping mechanism 4 is as follows: (1) Positioning stage: The third cylinder 421 drives the end limiting plate 422 through the slot 41131 and extends into the underside of the elastic floating plate 4113 to position the end face of the plate. It should be noted that this end face positioning is only performed during the loading operation. In addition, the side positioning module 44 positions the side of the heat exchange plate, and this side positioning is maintained throughout the welding process.

[0038] (2) Pressing stage: After the positioning operation is completed, the pressing function is started. The second cylinder 4111 drives the second pressure plate 4112 and the elastic floating plate 4113 connected thereto to move downward synchronously in the vertical direction, so that the heat exchange plate is pressed between the elastic floating plate 4113 and the welding support platform 6.

[0039] The laser welding mechanism 5 is fixedly connected to the base 1, and it is a structure that drives the laser welding head through three axes (X / Y / Z). The laser welding mechanism 5 includes an XYZ transfer module 51, a fourth support plate 52 located at the movable end of the XYZ transfer module 51, a laser welding head 53 fixed on the fourth support plate 52, and a dust extraction pipe 54.

[0040] The working process of the plate heat exchanger laser welding equipment 100 in this embodiment is as follows: Loading and initial positioning: The operator pushes the heat exchanger into the loading mechanism 2. The first limiting module 22 and the second limiting module 23 position the heat exchanger on both sides in the Y direction. At the same time, the third cylinder 421 drives the end limiting plate 422 through the slot 41131 and extends into the underside of the elastic floating plate 4113, thereby positioning the front end face of the plate in the X direction. At this time, the heat exchanger is located on the welding support platform 6, and the side positioning module 44 performs secondary positioning on the side of the heat exchanger in the Y direction.

[0041] Switching between welding and clamping states in the first area: After positioning, the second cylinder 4111 drives the second pressure plate 4112 and the elastic floating plate 4113 connected to it to move downwards in the vertical direction, so that the heat exchange plate is flexibly clamped between the elastic floating plate 4113 and the welding support platform 6. At this time, the laser welding mechanism 5 welds the first sub-area to be welded on the heat exchange plate. After the welding of this area is completed, the second cylinder 4111 drives the elastic floating plate 4113 to lift up to release the clamping state of the positioning and clamping mechanism 4. At the same time, the first clamping module 35 and the second clamping module 36 of the clamping and transfer mechanism 3 drive downward to clamp the heat exchange plate.

[0042] Transfer and subsequent area welding: The first drive assembly 31 drives the transfer frame 32, along with the pressed heat exchanger, to move along the X direction, transferring the second sub-area to be welded on the heat exchanger to the welding station above the welding support platform 6. After reaching the target position, the first clamping module 35 and the second clamping module 36 drive the first pressure plate 352 to reset upwards, and the second cylinder 4111 drives the second pressure plate 4112 to press down and clamp the heat exchanger. The laser welding mechanism 5 welds the second sub-area to be welded on the heat exchanger. The above clamping, transfer and welding steps are repeated until all welding is completed. Finally, the unloading mechanism 7 receives the heat exchanger and unloads it.

[0043] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A plate heat exchanger sheet laser welding apparatus, characterized by: It includes a feeding mechanism, a welding support platform and a unloading mechanism arranged sequentially along the X direction, a positioning and clamping mechanism disposed above the welding support platform and used to position and clamp the workpiece on the welding support platform, a laser welding mechanism for welding the workpiece on the welding support platform, a cooling device connected to the welding support platform, and a clamping and transfer mechanism for gradually transporting the workpiece from the feeding mechanism to the welding support platform.

2. The plate heat exchanger laser welding apparatus of claim 1, wherein: The feeding mechanism and the unloading mechanism are respectively disposed on the left and right sides of the welding support platform. Both include a plurality of conveying rollers arranged along the X direction, a first limiting module and a second limiting module disposed on both sides of the conveying rollers in the Y direction, and a first spacing adjustment module for adjusting the spacing between the first limiting module and the second limiting module. The first limiting module and the second limiting module each include a plurality of rollers arranged along the X direction.

3. The plate heat exchanger laser welding apparatus of claim 1, wherein: The pressing and transferring mechanism includes a first driving component, a transfer frame that moves horizontally in the X direction driven by the first driving component, a second support plate fixedly mounted on the transfer frame and supporting one side of the workpiece in the X direction, a third support plate fixedly mounted on the transfer frame and supporting the other side of the workpiece in the X direction, a first pressing module located above the second support plate, and a second pressing module located above the third support plate.

4. The plate heat exchanger laser welding apparatus of claim 3, wherein: Both the first pressing module and the second pressing module include a first cylinder fixed on the transfer frame and a first pressure plate that is driven by the first cylinder to move up and down.

5. The plate heat exchanger laser welding apparatus of claim 1, wherein: The welding support platform is located below the positioning and clamping mechanism; the surface of the welding support platform is provided with several air blowing holes for blowing out protective gas.

6. The plate heat exchanger laser welding apparatus of claim 1, wherein: The welding support platform is equipped with a cooling channel that connects to the cooling device.

7. The plate heat exchanger laser welding apparatus of claim 1, wherein: The positioning and pressing mechanism includes a first positioning and pressing module, a second positioning and pressing module that slides along the X direction, a second spacing adjustment module that adjusts the distance between the first positioning and pressing module and the second positioning and pressing module, and a side positioning module.

8. The plate heat exchanger laser welding apparatus of claim 7, wherein: Both the second positioning and pressing module and the first positioning and pressing module include a second cylinder, a second pressure plate disposed below the second cylinder and driven by the second cylinder to move up and down, and a plurality of elastic floating plates elastically floating below the second pressure plate.

9. The plate heat exchanger laser welding apparatus of claim 8, wherein: The second positioning and pressing module also includes a third cylinder fixedly disposed below the second pressure plate and an end limiting plate driven by the third cylinder to move up and down; the elastic floating plate is provided with a slot to avoid the up and down movement of the end limiting plate.

10. The plate heat exchanger laser welding apparatus of claim 7, wherein: The second spacing adjustment module includes a crossbeam that slides along the X direction, a second drive assembly disposed on the crossbeam, a pair of drive rods that are rotatably disposed on the crossbeam and rotated by the second drive assembly, two gears disposed at the ends of the pair of drive rods, and a rack that meshes with the gears; the second positioning and clamping module is fixedly disposed on the crossbeam.

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