Laser welding device for heat exchange plate

Abstract

The present invention relates to the technical field of welding devices, specifically a laser welding device for heat exchange plates. It comprises: a workbench, a mechanical arm is provided on one side of the workbench, a laser generator is provided on the mechanical arm, a sliding frame and a positioning frame are slidably connected in the workbench; the support shell is installed at the intersection of the sliding frame and the adjacent positioning frame; the sliding shell is slidably connected to the support shell, the sliding block is slidably connected to one end of the sliding shell, the sliding plate is slidably connected to the sliding block, and a first spring is fixed between the sliding plate and the adjacent sliding shell. The present invention compresses the first spring connected to the sliding plate, so that the sliding plate pushes the two heat exchange plate through-holes to align, and the support shell is centered in the heat exchange plate through-holes, thereby simultaneously completing the positioning of the four through-holes of the heat exchange plate and the fixing of the position of the heat exchange plate, thereby ensuring the accuracy and consistency of the alignment of the through-holes on the two heat exchange plates.

Description

Technical Field

[0001] The present invention relates to the technical field of welding devices, and in particular to a laser welding device for a heat exchange plate. Background Art

[0002] The heat exchange plate is a key component used in heat exchange equipment. Its main function is to fit together with another heat exchange plate through multiple protrusions to form a specific gas circulation chamber, thereby achieving efficient heat exchange function. In existing technologies, two heat exchange plates are fit together and laser welded to eventually form a heat exchange device with a specific gas circulation chamber. When processing heat exchange plates with through holes, existing laser welding devices usually need to first locate the position of the through holes of the heat exchange plates. When the through hole edges of the two heat exchange plates are aligned, a specific fixing ring is used to press the edge of the through hole and fixed with bolts.

[0003] However, the fixing method of pressing the edge of the through hole by a specific fixing ring has the following problems: after the fixation of one through hole is completed, the edges of the remaining through holes of the heat exchange plate will be misaligned. At this time, the fixing ring and bolts need to be repeatedly disassembled for readjustment. The operation steps are cumbersome and seriously affect the efficiency of heat exchange plate welding. In addition, when the edge of the through hole of the heat exchange plate is pressed by the bolt fixing ring, the heat exchange plate is prone to slight misalignment, which makes it difficult to align the remaining through holes, further increasing the difficulty and complexity of the alignment operation. Summary of the Invention

[0004] In order to solve the problem that multiple through holes on a heat exchange plate with through holes are difficult to align simultaneously, the present invention provides a laser welding device for the heat exchange plate.

[0005] 7. The swiftly and minutely adjusting device for a wood-planer working table as claimed in claim 1, wherein said linking rod and said adjusting base are pivotally connected to each other with a bolt, and said bolt has a round shank to contact with said linking rod. said linking rod is pivotally connected to said linking rod. said linking rod is pivotally connected to said linking rod.

[0006] As a preferred embodiment of the present invention, the fixing mechanism includes: a first electric push rod, fixedly connected to the support shell, a partition is provided in the support shell, for dividing the support shell into two upper and lower chambers, a conical block is fixedly connected to the telescopic end of the first electric push rod, the conical block slides in the support shell, the conical block is used to push the four sliding shells to move simultaneously, a first tension spring is fixedly connected between the sliding shell and the support shell, a limit pin is slidably connected to the sliding shell, a second spring is fixedly connected between the limit pin and the sliding shell, the limit pin Used to limit the sliding block, the sliding shell is connected to the chamber at the lower part of the support shell through a connecting pipe; the extrusion block is slidably connected to the chamber at the lower part of the support shell, the extrusion block is used to squeeze the workbench, and a second tension spring is fixed between the extrusion block and the partition inside the support shell, and the sliding shell and the chamber at the lower part of the support shell are filled with hydraulic oil; a pressing assembly is provided on the support shell, and is used to squeeze the edge of the through-hole of the heat exchange plate; the trigger assembly is provided on the support shell, and is used to control the order of alignment and fixation of the through-holes of the two heat exchange plates.

[0007] As a preferred embodiment of the present invention, a plurality of protrusions are provided on the lower side of the extrusion block, and the bottom surface inside the workbench is a rough surface, which is used to increase the friction between the extrusion block and the workbench.

[0008] As a preferred embodiment of the present invention, the pressing assembly includes: a sliding ring, which is slidably connected to the support shell, a fixed ring is provided on the sliding ring, and the sliding ring is limited and slidably connected to four limit blocks, the limit blocks are used to limit the fixed ring, the limit blocks are fixed with a pull rope, a third spring is provided between the limit block and the support shell, the pull rope is inserted into the support shell and fixed with the conical block, and a fourth spring is fixed between the sliding ring and the support shell.

[0009] As a preferred embodiment of the present invention, a slope is provided on one side of the limit block close to the support shell, and the slope spacing of the four limit blocks gradually increases from top to bottom. The slope of the limit block is used to assist the limit block to enter the support shell.

[0010] As a preferred embodiment of the present invention, the trigger assembly includes: four fixed cylinders, all of which are fixedly connected to the supporting shell, the fixed cylinders are connected to a liquid guide tube, the liquid guide tube is connected to the adjacent sliding shell, a sliding bent rod is slidably connected in the fixed cylinder, a third tension spring is fixed between the sliding bent rod and the supporting shell, an inclined surface is provided on the upper side of the sliding bent rod, the sliding bent rod is slidably connected to the supporting shell, the sliding bent rod is used to limit the sliding ring, and the sliding ring is used to squeeze the inclined surface of the sliding bent rod.

[0011] As a preferred embodiment of the present invention, the pre-positioning mechanism includes: two rotating bent plates, both of which are rotatably connected to the workbench, two second electric push rods are hinged in the workbench, the telescopic ends of the second electric push rods are hinged to the adjacent rotating bent plates, and a positioning shell is provided on the rotating bent plates.

[0012] As a preferred embodiment of the present invention, it also includes: two air injection mechanisms, respectively arranged on the corresponding rotating bent plates, for weakening the resistance when the two heat exchange plates move relative to each other, the air injection mechanism including: an air guide pipe, fixedly connected to the rotating bent plate, an air guide cavity being provided in the positioning shell, the air guide pipe being connected to the air guide cavity, and the air guide cavity being used to inject air between the two heat exchange plates.

[0013] As a preferred embodiment of the present invention, the air guide cavity in the positioning shell is provided with three air outlets, and the cross-sectional area of ​​the air guide cavity in the positioning shell becomes larger as it is closer to the air outlets, so as to weaken the flow rate of the gas entering between the two heat exchange plates.

[0014] As a preferred embodiment of the present invention, the gas injection mechanism further includes: a sliding frame, which is slidably connected to the rotating bent plate, and a fifth spring is fixed between the rotating bent plate and the sliding frame, and the sliding frame is used to stabilize the floating state of the upper heat exchange plate.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention compresses the first spring connected to the sliding plate, so that the sliding plate pushes the through holes of the two heat exchange plates to align, and the support shell is centered in the through holes of the heat exchange plates, thereby simultaneously completing the positioning of the four through holes of the heat exchange plates and the fixing of the position of the heat exchange plates, thereby ensuring the accuracy and consistency of the alignment of the through holes on the two heat exchange plates.

[0016] 2. The present invention fixes the position of the support shell by squeezing the inner bottom surface of the workbench through the squeezing block in the fixing mechanism, thereby ensuring the position stability of the heat exchange plate during the welding process and improving the accuracy of the fixing ring pressing the edge of the through hole of the heat exchange plate.

[0017] 3. The present invention embeds the positioning shell in the pre-positioning mechanism into the notch position of the heat exchange plate, so that the through holes of the two heat exchange plates are roughly aligned, thereby shortening the time for subsequent alignment of the through holes of the two heat exchange plates.

[0018] 4. The present invention uses the air guide pipe in the air injection mechanism to inject air between the two heat exchange plates through the air guide cavity of the positioning shell, thereby reducing the resistance when the two heat exchange plates move relative to each other, ensuring the safety of the edges of the through holes of the heat exchange plates, and accelerating the speed of aligning the edges of the through holes of the heat exchange plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2It is a schematic diagram of the three-dimensional structure of the internal structure of the workbench of the present invention;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the parts of the fixing ring and the limit block of the present invention;

[0022] Figure 4 Schematic diagram of the three-dimensional structure of the first electric push rod and the conical block parts of the present invention;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the parts of the sliding block and the sliding plate of the present invention;

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the parts of the limit pin and the connecting pipe of the present invention;

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of the parts of the positioning shell and the sliding frame of the present invention;

[0026] Figure 8 It is a cross-sectional view of the parts at the rotating bent plate and the positioning shell of the present invention.

[0027] In the accompanying drawings: 1-workbench, 2-robotic arm, 3-sliding frame, 4-positioning frame, 5-support shell, 6-sliding shell, 7-sliding block, 8-sliding plate, 21-first electric push rod, 22-tapered block, 23-limiting pin, 24-connecting pipe, 25-extrusion block, 31-sliding ring, 32-fixing ring, 33-limiting block, 34-pull rope, 41-fixing cylinder, 42-sliding bent rod, 43-liquid guide tube, 51-rotating bent plate, 52-second electric push rod, 53-positioning shell, 62-air guide cavity, 63-air guide tube, 71-sliding frame. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 -Attached Figure 8 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0029] Example 1: During the operation of an existing laser welding device, after one through-hole of a heat exchange plate is aligned, a special fixing ring is required to be used in combination with bolts to tighten the aligned through-hole of the heat exchange plate. However, the remaining through-holes of the heat exchange plate may still be in a misaligned state, and the fixing ring and bolts need to be repeatedly removed to adjust the heat exchange plate. The operation steps are cumbersome, which seriously affects the efficiency of heat exchange plate welding.

[0030] A laser welding device for heat exchange plates, please refer to the attached Figure 1-Attached Figure 6 As shown, it includes: a workbench 1, a mechanical arm 2 is provided on one side of the workbench 1, a laser generator is provided on the mechanical arm 2, two sliding frames 3 and two positioning frames 4 are slidably connected in the workbench 1; four positioning units are respectively located at the intersection of the two sliding frames 3 and the two positioning frames 4; the positioning unit includes: a support shell 5, four sliding shells 6, four sliding blocks 7, four sliding plates 8 and a fixing mechanism; the support shell 5 is installed at the intersection of the sliding frame 3 and the adjacent positioning frame 4; each sliding shell 6 is slidably connected to the support shell 5. On the support shell 5, the sliding block 7 is slidably connected to one end of the sliding shell 6, the sliding plate 8 is slidably connected to the sliding block 7, and a first spring is fixed between the sliding plate 8 and the adjacent sliding shell 6; a fixing mechanism is provided in the support shell 5, and is used to align the through holes of the two heat exchange plates and then fix them; a pre-positioning mechanism is provided on the workbench 1, and is used to roughly fix the positions of the two heat exchange plates. The fixing mechanism includes: a first electric push rod 21, which is fixed in the support shell 5, and a partition is provided in the support shell 5, which is used to divide the support shell 5 into two upper and lower chambers The telescopic end of the first electric push rod 21 is fixed with a conical block 22, which slides in the support shell 5. The conical block 22 is used to push the four sliding shells 6 to move simultaneously. A first tension spring is fixed between the sliding shell 6 and the support shell 5. A limit pin 23 is slidably connected to the sliding shell 6. A second spring is fixed between the limit pin 23 and the sliding shell 6. The limit pin 23 is used to limit the sliding block 7. The sliding shell 6 is connected to the chamber at the lower part of the support shell 5 through the connecting pipe 24; the extrusion block 25 is slidably connected to the chamber at the lower part of the support shell 5. The extrusion block 25 is used to extrude the workbench 1. A second tension spring is fixedly connected between the extrusion block 25 and the partition inside the support shell 5. The sliding shell 6 and the chamber at the lower part of the support shell 5 are filled with hydraulic oil; the pressing assembly is arranged on the support shell 5, and is used to squeeze the edge of the through-hole of the heat exchange plate; the trigger assembly is arranged on the support shell 5, and is used to control the order of alignment and fixation of the through-holes of the two heat exchange plates. The lower side of the extrusion block 25 is provided with multiple protrusions, and the bottom surface inside the workbench 1 is a rough surface, which is used to increase the friction between the extrusion block 25 and the workbench 1.

[0031] In the above scheme, it is intended to solve the problem that multiple through holes on a heat exchange plate with through holes may not be able to complete the alignment and fixing operations at the same time; a control panel is provided on the robotic arm 2, and the robotic arm 2, the first electric push rod 21 and the pre-positioning mechanism are all electrically connected to the control panel. The heat exchange plate targeted by this device has four through holes distributed in a rectangular manner, and at the same time, notches for positioning are provided on the left and right sides of the heat exchange plate. The two sliding frames 3 and the two positioning frames 4 are in a well shape in the workbench 1, and the two sliding frames 3 are located on the upper side of the two positioning frames 4. The opposite sides of the four sliding plates 8 are arc-shaped surfaces, and the arc-shaped surfaces of the sliding plates 8 are used to fit the edges of the through holes of the heat exchange plates so that the through holes of the two heat exchange plates are aligned. The horizontal surface where the four sliding shells 6 are located It is higher than the upper side surface of the workbench 1, and is used to make the sliding plate 8 contact with the edges of the through holes of the two heat exchange plates. By moving the conical block 22 upward, the four sliding shells 6 are synchronously moved away from each other. Combined with the squeezing of the edges of the through holes of the heat exchange plates by the sliding plate 8, on the basis of the alignment of the through holes of the two heat exchange plates, the support shell 5 pushes the sliding frame 3 and the positioning frame 4 to move, and the axis of the support shell 5 passes through the center of the through holes of the heat exchange plates, and the positioning of the four through holes of the heat exchange plates and the fixing of the positions of the heat exchange plates are synchronously completed, so as to achieve the purpose of consistent fixing force of the pressing assembly on the edges of the through holes of the heat exchange plates at different positions, thereby improving the welding accuracy at the through holes of the heat exchange plates. The first electric push rod 21 is located above the partition inside the support shell 5, and the diameter of the conical block 22 gradually increases from top to bottom.

[0032] Working process: When using this device to perform laser welding on the heat exchange plate, the operator places the two fitted heat exchange plates on the upper side of the workbench 1, and then the control panel controls the pre-positioning mechanism to pre-fix the two heat exchange plates. The through holes of the two heat exchange plates are roughly aligned, and then the control panel starts the four first electric push rods 21. Taking the first electric push rod 21 on the left rear side as an example, the telescopic end of the first electric push rod 21 extends and drives the conical block 22 to move upward. The conical block 22 pushes the four sliding shells 6 away from each other, and the sliding shell 6 stretches the first tension spring connected to it. As the telescopic end of the first electric push rod 21 extends, the sliding plate 8 contacts and squeezes the edge of the through hole of the heat exchange plate, and the sliding plate 8 moves into the sliding block 7 and presses The first spring connected to it is retracted, and the sliding block 7 is limited by the limit pin 23. The sliding block 7 does not move relative to the sliding shell 6. The sliding plate 8 aligns the edges of the through holes of the two heat exchange plates through the elastic force of the first spring connected to it. At the same time, if the supporting shell 5 is not at the center of the circle of the through hole corresponding to the heat exchange plate, the supporting shell 5 moves to the center of the circle of the through hole corresponding to the heat exchange plate under the elastic force of the first spring connected to the sliding plate 8, and the sliding frame 3 and the positioning frame 4 move synchronously. The two heat exchange plates are roughly fixed by the pre-positioning mechanism, combined with the precise alignment of the through holes of the two heat exchange plates by the sliding plate 8 through the first spring. This two-level positioning method not only improves the speed of aligning the two heat exchange plates, but also ensures the accuracy of welding the two heat exchange plates.

[0033] In the process of the four sliding shells 6 moving away from each other, after the support shell 5 moves to the center of the through hole corresponding to the heat exchange plate, the four sliding plates 8 squeeze the edges of the through hole of the heat exchange plate with equal force, and the positions of the four support shells 5 are adjusted at the same time. When the sliding plate 8 moves to the limit in the sliding block 7, due to the continuous movement of the sliding shell 6, the heat exchange plate pushes the sliding block 7 hard through the sliding plate 8. The sliding shell 6 uniformly and rigidly supports the edge of the through hole of the heat exchange plate through the sliding plate 8 and the sliding block 7. The four through holes of the heat exchange plate complete the alignment operation at the same time, so that the alignment state of the heat exchange plate remains unchanged during subsequent fixation. The sliding block 7 pushes the limit pin 23 to move downward, and the limit pin 23 loses the limit on the sliding block 7. The positioning pin 23 compresses the second spring connected to it, and the hydraulic oil in the sliding shell 6 enters the chamber on the lower side of the support shell 5 through the connecting pipe 24. The extrusion block 25 moves downward and squeezes the bottom surface of the workbench 1 to fix the position of the support shell 5, so that the two heat exchange plates remain in position during the welding process after being pressed, thereby improving the welding accuracy of the heat exchange plates. The extrusion block 25 stretches the second tension spring connected to it, and at the same time, the hydraulic oil in the support shell 5 causes the trigger assembly to control the pressing assembly to move downward, and the pressing assembly presses the edges of the through holes aligned with the heat exchange plates. At this time, the control panel closes the first electric push rod 21, and at the same time, the control panel controls the movement of the robotic arm 2, so that the laser generator on the robotic arm 2 completes the laser welding operation on the heat exchange plates.

[0034] When the welding of the heat exchange plate is completed, the control panel controls the telescopic end of the first electric push rod 21 to retract to reset, the conical block 22 resets, the sliding shell 6 returns to its position under the tension of the connected first tension spring, the sliding plate 8 moves and resets under the elastic force of the first spring, the extrusion block 25 separates from the workbench 1 under the action of the second tension spring, and the hydraulic oil flows back to the sliding shell 6 through the connecting pipe 24. The sliding block 7 moves and resets, the limit pin 23 re-limits the sliding block 7, and the conical block 22 moves to make the pressing assembly and the trigger assembly move and reset. Finally, the control panel controls the pre-positioning mechanism to release the fixation of the heat exchange plate. Finally, all components return to their initial state, and the operator can replace the next set of heat exchange plates.

[0035] Please refer to the attached Figure 1 -Attached Figure 5As shown, the pressing assembly includes: a sliding ring 31, which is slidably connected to the support shell 5, a fixed ring 32 is provided on the sliding ring 31, and the sliding ring 31 is limited and slidably connected to four limit blocks 33, the limit blocks 33 are used to limit the fixed ring 32, the limit blocks 33 are fixed with a pull rope 34, a third spring is provided between the limit block 33 and the support shell 5, the pull rope 34 is inserted into the support shell 5 and fixed with the tapered block 22, a fourth spring is fixed between the sliding ring 31 and the support shell 5, and the limit block 33 is provided with an inclined surface on the side close to the support shell 5, and the inclined surface spacing of the four limit blocks 33 is gradually increased from top to bottom. Gradually increasing, the inclined surface of the limit block 33 is used to assist the limit block 33 to enter the support shell 5, and the trigger component includes: four fixed cylinders 41, all of which are fixedly connected to the support shell 5, and the fixed cylinder 41 is connected with a liquid guide tube 43, and the liquid guide tube 43 is connected with the adjacent sliding shell 6. A sliding bent rod 42 is slidably connected in the fixed cylinder 41, and a third tension spring is fixed between the sliding bent rod 42 and the support shell 5. An inclined surface is provided on the upper side of the sliding bent rod 42, and the sliding bent rod 42 is slidably connected to the support shell 5. The sliding bent rod 42 is used to limit the sliding ring 31, and the sliding ring 31 is used to squeeze the inclined surface of the sliding bent rod 42.

[0036] In the above scheme, the purpose is to align and position the four through holes of the heat exchange plate, and then press the edges of the through holes of the heat exchange plate to ensure the accuracy of subsequent laser welding; initially, the fixing ring 32 can be freely removed or placed on the sliding ring 31, and the limit block 33 does not hinder the up and down movement of the fixing ring 32. This modular design allows the operator to replace the fixing ring 32 according to the different sizes of the through holes of the heat exchange plate, so that the device can adapt to the welding operations of heat exchange plates of different specifications, and at the same time improves the convenience of adjusting the device before welding heat exchange plates of different specifications. The fourth spring connected to the sliding ring 31 is initially in a compressed state, the third spring in the support shell 5 is initially in a compressed state, the pull rope 34 is initially in a taut state, the connection relationship between the third spring and the support shell 5 is fixed, and the limit block 33 and the corresponding third spring only contact each other.

[0037] Workflow: After the operator places the two fitting heat exchange plates on the upper side of the workbench 1, the operator places the corresponding fixed ring 32 on the sliding ring 31, and then the control panel starts the device to repeat the above operation. During the upward movement of the conical block 22, the pull rope 34 relaxes, and the four limit blocks 33 move away from each other under the elastic force of the third spring connected to them. The limit block 33 clamps the fixed ring 32 on the sliding ring 31. When the limit pin 23 releases the limit of the sliding block 7, part of the hydraulic oil in the sliding shell 6 enters the fixed cylinder 41 through the liquid guide tube 43, and the sliding bent rod 42 moves toward the axial direction of the support shell 5. The sliding bent rod 42 stretches the third tension spring connected to it. At the same time, the sliding bent rod 42 releases the limit of the sliding ring 31, and the sliding ring 31 moves downward under the elastic force of the fourth spring connected to it. The sliding ring 31 cooperates with the limit block 33 to drive the fixed ring 32 to complete the compression and fixation of the edge of the through hole of the heat exchange plate, preventing the heat exchange plate from being affected by vibration during the subsequent welding process, thereby improving the accuracy of subsequent laser welding. When the welding of the heat exchange plate is completed, the control panel moves and resets the conical block 22 through the first electric push rod 21, and the conical block 22 moves the sliding ring 31 and the fixed ring 32 upward and resets through the pull rope 34 and the limit block 33. The fourth spring at the sliding ring 31 returns to its initial compression state. Finally, the pull rope 34 pulls the limit block 33 into the support shell 5, and the limit block 33 compresses the corresponding third spring. The limit of the fixed ring 32 is released. At the same time, the sliding bent rod 42 moves and resets under the tension of the third tension spring, and the sliding bent rod 42 resumes the limit on the sliding ring 31. At this point, all parts in this device return to their initial positions.

[0038] Please refer to the attached Figure 2 , Attachment Figure 6 and attached Figure 7 As shown, the pre-positioning mechanism includes: two rotating bent plates 51, both of which are rotatably connected to the workbench 1, two second electric push rods 52 are hinged inside the workbench 1, the telescopic ends of the second electric push rods 52 are hinged to the adjacent rotating bent plates 51, and a positioning shell 53 is provided on the rotating bent plates 51.

[0039] In the above scheme, the purpose is to roughly position the through holes of the two heat exchange plates before the sliding plate 8 positions the through holes of the heat exchange plates, thereby shortening the moving distance when the edges of the through holes of the two heat exchange plates are positioned; the rotating bent plate 51 is located at the center of the left and right sides of the heat exchange plate, the shape of the positioning shell 53 is similar to the shape of the notches on both sides of the heat exchange plate, and the second electric push rod 52 is electrically connected to the control panel.

[0040] Working process: After the operator places two fitted heat exchange plates on the upper surface of the workbench 1, the control panel activates the two second electric push rods 52. The telescopic ends of the second electric push rods 52 extend and drive the rotating bent plate 51 to rotate. Taking the rotating bent plate 51 on the left as an example, the rotating bent plate 51 drives the positioning shell 53 to rotate clockwise (from front to back). The positioning shell 53 is embedded in the notches on both sides of the heat exchange plates, so that the edges of the two heat exchange plates are roughly aligned, reducing the difficulty of subsequent precise alignment of the edges of the through holes on the heat exchange plates. When the heat exchange plates are welded, the control panel uses the second electric push rod 52 to swing the rotating bent plate 51 back to its original position. The positioning shell 53 loses contact with the heat exchange plates, allowing the operator to quickly remove the welded heat exchange plates.

[0041] Example 2: Based on Example 1, please refer to the attached Figure 6 -Attached Figure 8 As shown, it also includes: two air injection mechanisms, which are respectively arranged on the corresponding rotating bent plates 51, and are used to weaken the resistance when the two heat exchange plates move relative to each other. The air injection mechanism includes: an air guide pipe 63, which is fixed to the rotating bent plate 51, and an air guide cavity 62 is provided in the positioning shell 53. The air guide pipe 63 is connected to the air guide cavity 62, and the air guide cavity 62 is used to inject air between the two heat exchange plates. The air guide cavity 62 in the positioning shell 53 is provided with three air outlet holes. The closer the cross-sectional area of ​​the air guide cavity 62 in the positioning shell 53 is to its air outlet holes, the larger it is, which is used to weaken the flow rate of the gas entering between the two heat exchange plates. The air injection mechanism also includes: a sliding frame 71, which is slidably connected to the rotating bent plate 51. A fifth spring is fixed between the rotating bent plate 51 and the sliding frame 71. The sliding frame 71 is used to stabilize the floating state of the upper heat exchange plate.

[0042] In the above solution, the aim is to solve the problem of relative movement and alignment of the two heat exchange plates by squeezing the edges of the through-holes of the two heat exchange plates. However, due to the uneven surfaces of the two heat exchange plates, there is friction between the two heat exchange plates, which easily causes the edges of the through-holes of the heat exchange plates to be squeezed and bent. The air guide pipe 63 is externally connected to an air pump (an existing device, not shown in the figure), and the air pump is electrically connected to the control panel.

[0043] Working process: When the rotating bent plate 51 rotates to pre-position the heat exchange plate, the sliding frame 71 first contacts the heat exchange plate and moves upward, and the sliding frame 71 compresses the fifth spring connected to it. When the control panel starts the four first electric push rods 21, the rotating bent plate 51 is driven to drive the positioning shell 53 to embed into the gaps on both sides of the heat exchange plate to complete the preliminary alignment. Then, the control panel starts the air pump, and the air pump injects gas into the air guide cavity 62 in the positioning shell 53 through the air guide pipe 63. The gas entering the air guide cavity 62 is divided into three parts and slowly injected between the two heat exchange plates from the three air outlets thereon. The gas flows in the gas circulation chamber formed between the two heat exchange plates, so that the two heat exchange plates form a certain distance, weakening the two heat exchange plates. The resistance generated during relative movement, the sliding frame 71 stabilizes the upper heat exchange plate through the elastic force of the fifth spring connected to it. At the same time, the operator needs to adjust the gas flow rate of the air pump in advance according to the specifications of the heat exchange plate to prevent the gas flow rate from being too fast, which causes the two heat exchange plates to adsorb each other due to the Bernoulli principle. After the fixing ring 32 presses the heat exchange plate, the control panel turns off the air pump and stops gas injection to ensure the stability of the position of the heat exchange plate during subsequent welding. When the welding of the heat exchange plate is completed, the control panel controls the relevant parts to perform the above-mentioned reset operation, and the rotating bent plate 51 swings and resets. The sliding frame 71 moves and resets under the elastic force of the fifth spring connected to it. At this point, all parts in this device are restored to their initial positions.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can better understand and utilize the present invention. As long as they do not deviate from the structure of the invention or exceed the scope of protection of the present invention, they should fall within the scope of protection of the present invention.

Claims

1. A laser welding device for a heat exchange plate, comprising: A workbench (1), wherein a mechanical arm (2) is provided on one side of the workbench (1), a laser generator is provided on the mechanical arm (2), and two sliding frames (3) and two positioning frames (4) are slidably connected within the workbench (1); Four positioning units, respectively located at the intersections of the two sliding frames (3) and the two positioning frames (4); The positioning unit comprises: a supporting shell (5), four sliding shells (6), four sliding blocks (7), four sliding plates (8) and a fixing mechanism; The support shell (5) is installed at the intersection of the sliding frame (3) and the adjacent positioning frame (4); Each of the sliding shells (6) is slidably connected to the supporting shell (5), the sliding block (7) is slidably connected to one end of the sliding shell (6), the sliding plate (8) is slidably connected to the sliding block (7), and a first spring is fixed between the sliding plate (8) and the adjacent sliding shell (6); The fixing mechanism is arranged in the supporting shell (5) and is used to align the through holes of the two heat exchange plates and then fix them; A pre-positioning mechanism, provided on the workbench (1), for roughly fixing the positions of the two heat exchange plates; The fixing mechanism comprises: A first electric push rod (21) is fixedly connected to the support shell (5), and a partition is provided in the support shell (5) for dividing the support shell (5) into two upper and lower chambers. A conical block (22) is fixedly connected to the telescopic end of the first electric push rod (21), and the conical block (22) slides in the support shell (5). The conical block (22) is used to push the four sliding shells (6) to move simultaneously. A first tension spring is fixedly connected between the sliding shell (6) and the support shell (5). A limit pin (23) is slidably connected on the sliding shell (6). A second spring is fixedly connected between the limit pin (23) and the sliding shell (6). The limit pin (23) is used to limit the sliding block (7). The sliding shell (6) is connected to the chamber at the lower part of the support shell (5) through a connecting pipe (24); An extrusion block (25) is slidably connected to the chamber at the lower portion of the support shell (5), the extrusion block (25) is used to extrude the workbench (1), a second tension spring is fixedly connected between the extrusion block (25) and the inner partition of the support shell (5), and the chambers at the lower portion of the sliding shell (6) and the support shell (5) are both filled with hydraulic oil; A pressing assembly, arranged on the support shell (5), for pressing the edges of the through holes of the heat exchange plate; A trigger assembly is provided on the support shell (5) and is used to control the sequence of alignment and fixation of the through holes of the two heat exchange plates.

2. The laser welding device for heat exchange plates according to claim 1, characterized in that: The lower side of the extrusion block (25) is provided with a plurality of protrusions, and the bottom surface inside the workbench (1) is a rough surface, which is used to increase the friction between the extrusion block (25) and the workbench (1).

3. The laser welding device for heat exchange plates according to claim 2, characterized in that: The press-fit assembly comprises: A sliding ring (31) is slidably connected to the support shell (5), a fixed ring (32) is provided on the sliding ring (31), and the sliding ring (31) is slidably connected to four limit blocks (33), the limit blocks (33) are used to limit the fixed ring (32), the limit blocks (33) are fixedly connected to a pull rope (34), a third spring is provided between the limit block (33) and the support shell (5), the pull rope (34) is inserted into the support shell (5) and fixedly connected to the conical block (22), and a fourth spring is fixedly connected between the sliding ring (31) and the support shell (5).

4. The laser welding device for heat exchange plates according to claim 3, characterized in that: A slope is provided on one side of the limiting block (33) close to the supporting shell (5), and the spacing between the slopes of the four limiting blocks (33) gradually increases from top to bottom. The slopes of the limiting blocks (33) are used to assist the limiting blocks (33) in entering the supporting shell (5).

5. The laser welding device for heat exchange plates according to claim 4, characterized in that: The trigger component includes: Four fixed cylinders (41) are all fixedly connected to the support shell (5). The fixed cylinder (41) is connected to a liquid guide tube (43), and the liquid guide tube (43) is connected to the adjacent sliding shell (6). A sliding curved rod (42) is slidably connected in the fixed cylinder (41). A third tension spring is fixedly connected between the sliding curved rod (42) and the support shell (5). An inclined surface is provided on the upper side of the sliding curved rod (42). The sliding curved rod (42) is slidably connected to the support shell (5). The sliding curved rod (42) is used to limit the sliding ring (31), and the sliding ring (31) is used to squeeze the inclined surface of the sliding curved rod (42).

6. The laser welding device for heat exchange plates according to claim 5, characterized in that: The pre-positioning mechanism comprises: Two rotating bent plates (51) are both rotatably connected to the workbench (1). Two second electric push rods (52) are hinged in the workbench (1). The telescopic ends of the second electric push rods (52) are hinged to the adjacent rotating bent plates (51). A positioning shell (53) is provided on the rotating bent plates (51).

7. The laser welding device for heat exchange plates according to claim 6, characterized in that include: Two gas injection mechanisms are respectively arranged on the corresponding rotating bent plates (51) and are used to reduce the resistance when the two heat exchange plates move relative to each other. The gas injection mechanisms include: An air guide pipe (63) is fixedly connected to the rotating bent plate (51). An air guide cavity (62) is provided in the positioning shell (53). The air guide pipe (63) is communicated with the air guide cavity (62). The air guide cavity (62) is used to inject air between the two heat exchange plates.

8. The laser welding device for heat exchange plates according to claim 7, characterized in that: The air guide cavity (62) in the positioning shell (53) is provided with three air outlet holes. The closer the cross-sectional area of ​​the air guide cavity (62) in the positioning shell (53) is to the air outlet holes, the larger it is, so as to reduce the flow rate of the gas entering between the two heat exchange plates.

9. The laser welding device for heat exchange plates according to claim 8, characterized in that: The gas injection mechanism further comprises: The sliding frame (71) is slidably connected to the rotating bent plate (51), and a fifth spring is fixed between the rotating bent plate (51) and the sliding frame (71). The sliding frame (71) is used to stabilize the floating state of the upper heat exchange plate.

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