Necking method for micro-channel aluminum flat tube

Abstract

The invention discloses a closing-up method for a micro-channel aluminum flat pipe, which comprises the following steps: closing up and cutting the aluminum flat pipe by using a closing-up device, and then conveying the closed-up and cut aluminum flat pipe; and after the closed and cut aluminum flat tube is conveyed to a set distance, the aluminum flat tube is clamped from the two sides of the cutting line by the snapping device, and the aluminum flat tube is snapped from the cutting line by the snapping device. Closing and cutting of the aluminum flat pipe are completed at the same position, the aluminum flat pipe does not need to be moved and conveyed in the closing and cutting process, the closing device does not completely cut off the aluminum flat pipe, after the aluminum flat pipe is conveyed to the set length, the aluminum flat pipe is snapped from a cutting line of the cutting position through the snapping device, and when the aluminum flat pipe is snapped, the aluminum flat pipe is cut off. The two sides of the cutting line are clamped by the snapping device, the snapping process cannot affect closing and cutting of the closing device, and the closing efficiency and precision of the aluminum flat pipe are greatly improved.

Description

Technical Field

[0001] This invention relates to a method for closing a microchannel aluminum flat tube, belonging to the field of metal processing. Background Technology

[0002] Microchannel flat tubes are mainly used in the evaporator and condenser cores of automotive heat exchange systems. The core is generally assembled from flat tubes and manifolds. In order to ensure the smooth assembly of flat tubes and manifolds, and to avoid leakage at the joint between flat tubes and manifolds after the core is brazed, the precision requirements for the flat tube end size are very high.

[0003] There are two existing methods for flat tube end-closing: one is to first cut the flat tube and then end-closing it. This method requires closing both ends of the cut flat tube sequentially, resulting in low end-closing efficiency. Furthermore, the flat tube deforms due to compression during end-closing, and closing both ends separately leads to greater cumulative deformation, making it difficult to effectively improve end-closing accuracy. The other method involves first end-closing the flat tube, then conveying it forward a specified distance L (the length of the flat tube after end-closing and cutting, i.e., the distance between the end-closing die and the cutter), and then the cutter cuts the flat tube. Figure 1 As shown, this method significantly improves the closing efficiency of the flat tube. However, since the flat tube is formed by die extrusion, its width and thickness vary. When the width and thickness of the flat tube change, it will deviate from the center of the closing die in both the width and thickness directions, as shown in the example. Figure 2 As shown, this leads to eccentricity at the taper, and the forward transmission distance after the flat tube tapers is not exactly equal to L, causing the tool to be unable to cut accurately at the center of the taper. This results in inconsistent taper dimensions of the cut flat tube, making it difficult to control the precision of tapering and cutting. The overall precision of flat tube tapering still has considerable room for improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a method for closing microchannel aluminum flat tubes, which improves the efficiency of closing aluminum flat tubes while ensuring the accuracy of the aluminum flat tubes.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a method for closing a microchannel aluminum flat tube, wherein the aluminum flat tube is closed and cut by a closing device, and then the closed and cut aluminum flat tube is transported; after the closed and cut aluminum flat tube is transported to a set distance, the aluminum flat tube is clamped from both sides of the cutting line by a breaking device, and the aluminum flat tube is broken from the cutting line by the breaking device. This invention uses a closing device to close and cut aluminum flat tubes. Therefore, the closing and cutting of the aluminum flat tubes are completed by the same component. The aluminum flat tube does not need to be moved or transported during the closing and cutting processes. The flat tube is positioned during closing, and the cutting and closing are completed at the same location. Thus, the flat tube is cut at the closing center. Furthermore, the closing device does not completely sever the aluminum flat tube; instead, after the aluminum flat tube has been transported to a set length, a breaking device pulls it off at the cutting line. During the breaking process, both sides of the cutting line are clamped by the breaking device. This breaking process does not affect the closing and cutting at the closing device. In this invention, while the breaking device breaks the aluminum flat tube, the closing device simultaneously closes and cuts another part of the aluminum flat tube, significantly improving the closing efficiency and accuracy of the aluminum flat tube.

[0006] As a further improvement of the present invention, before the aluminum flat tube enters the closing device, an automatic finishing device first finishes the aluminum flat tube in both width and thickness directions. The present invention first finishes the aluminum flat tube in both width and thickness, further improving the accuracy of the aluminum flat tube closing process.

[0007] As a further improvement of the present invention, the automatic finishing device includes a width finishing unit and a thickness finishing unit. The width finishing unit has a first fixed metal wheel and a first movable metal wheel located on both sides of the aluminum flat tube in the width direction. The first movable metal wheel moves toward or away from the first fixed metal wheel to adjust the aluminum flat tube passing between the first fixed metal wheel and the first movable metal wheel in the width direction. The thickness finishing unit has a second fixed metal wheel and a second movable metal wheel located on both sides of the aluminum flat tube in the thickness direction. The second movable metal wheel moves toward or away from the second fixed metal wheel to adjust the aluminum flat tube passing between the second fixed metal wheel and the second movable metal wheel in the thickness direction. This invention adjusts the distance between the first movable metal wheel and the first fixed metal wheel by moving the first movable metal wheel relative to the first fixed metal wheel. This increases or decreases the extrusion of the aluminum flat tube between the first fixed metal wheel and the first movable metal wheel, thereby ensuring the dimensional accuracy of the aluminum flat tube in width. Similarly, by moving the second movable metal wheel relative to the second fixed metal wheel, the distance between the second movable metal wheel and the second fixed metal wheel is adjusted, increasing or decreasing the extrusion of the aluminum flat tube passing between the second movable metal wheel and the second fixed metal wheel in thickness direction. This ensures the dimensional accuracy of the aluminum flat tube in thickness, solving the problem of eccentricity at the end of the tube caused by the deviation of the flat tube from the center of the end-closing mold due to changes in the width and thickness of the flat tube.

[0008] As a further improvement of the present invention, an automatic detection device is also included, comprising a width detection unit and a thickness detection unit. The width detection unit is used to detect the width of the aluminum flat tube, and a first movable metal wheel is adjusted towards or away from the first fixed metal wheel according to the width of the aluminum flat tube detected by the width detection unit. The thickness detection unit is used to detect the thickness of the aluminum flat tube, and a second movable metal wheel is adjusted towards or away from the second fixed metal wheel according to the thickness of the aluminum flat tube detected by the thickness detection unit. The present invention measures the width and thickness of the aluminum flat tube in the direction of the width and thickness through the width detection unit and the thickness detection unit, providing a basis for the automatic finishing device to finish the aluminum flat tube. While further improving the efficiency of the present invention, it also improves the degree of automation. Because the present invention adds an automatic detection unit and an automatic finishing unit, it detects the width and thickness of the flat tube in real time. When the width and thickness are detected to deviate from the set range, the positions of the metal wheel and the metal roller are automatically adjusted to finish the width and thickness of the flat tube to the set range, ensuring that the flat tube is always centered in the closing mold in the width and thickness directions.

[0009] As a further improvement of the present invention, the breaking device includes a rear clamping plate and a front clamping plate. The rear clamping plate has an upper fixed clamping plate and a lower fixed clamping plate. The upper fixed clamping plate can move up and down relative to the lower fixed clamping plate. The up and down movement of the upper fixed clamping plate can release or clamp the aluminum flat tube from the rear side of the cutting line. The front clamping plate has an upper movable clamping plate and a lower movable clamping plate. The upper movable clamping plate can move up and down relative to the lower movable clamping plate. The up and down movement of the upper movable clamping plate can release or clamp the aluminum flat tube from the front side of the cutting line. The upper movable clamping plate and the lower movable clamping plate can move in the front and back directions. When the rear clamping plate and the front clamping plate clamp the aluminum flat tube from the rear side and the front side of the cutting line, respectively, the front clamping plate moves forward to break the aluminum flat tube from the cutting line. In this invention, the rear clamping plate clamps the aluminum flat tube from behind the cutting line when it breaks, preventing the pulling of the aluminum flat tube from affecting the closing device's closing and cutting of the next closing part of the aluminum flat tube. The front clamping plate clamps the aluminum flat tube from the front of the cutting line and can move back and forth. By moving the front clamping plate forward, the aluminum flat tube is pulled and broken from the cutting line.

[0010] As a further improvement of the present invention, the closing device includes a closing assembly and a cutting assembly. The closing assembly has two closing units located on the left and right sides of the aluminum flat tube respectively in use. The two closing units are close to each other to close the aluminum flat tube, and the two closing units are far apart to release the aluminum flat tube. The cutting assembly has two cutting units located on the upper and lower sides of the aluminum flat tube respectively in use. The two cutting units are close to each other to cut a cutting line on the aluminum flat tube, and the two cutting units are far apart to release the aluminum flat tube. In the present invention, the two closing units of the closing assembly are close to each other to reduce the distance between them, thereby squeezing the aluminum flat tube to close it. After closing, the two closing units are far apart to release the aluminum flat tube. The two cutting units of the cutting assembly are close to each other to cut the aluminum flat tube and create a cutting line at the cut, which facilitates the subsequent breaking of the aluminum flat tube. The two cutting units are far apart to avoid obstructing the conveying of the aluminum flat tube at the closing device and to facilitate the next cutting of the aluminum flat tube.

[0011] As a further improvement of the present invention, the closing device further includes an intermediate gear, two closing gears, two cutting gears, and a driving device. The intermediate gear has an aluminum flat tube channel along its centerline for the aluminum flat tube to pass through. The two closing gears are located on the left and right sides of the intermediate gear and mesh with it. Two closing units are respectively mounted on the two closing gears, and the rotation of the two closing gears drives the two closing units to move closer or further apart. The two cutting gears are located on the upper and lower sides of the intermediate gear and mesh with it. Two cutting units are respectively mounted on the two cutting gears, and the rotation of the two cutting gears drives the two cutting units to move closer or further apart. The driving device is connected to any one of the two closing gears and the two cutting gears, and is used to drive the intermediate gear, closing gear, and cutting gear to rotate. The present invention, through the meshing of the intermediate gear with the cutting gear and the closing gear, enables the two cutting gears and the two closing gears to rotate in the same direction and at the same speed, allowing the two closing units to move closer or further apart, and the two cutting units to also move closer or further apart.

[0012] As a further improvement of the present invention, when the two closing units are close to each other, the two cutting units are far apart, and when the two closing units are far apart, the two cutting units are close to each other. In the present invention, the closing units and the cutting units do not simultaneously perform closing and cutting processing on the aluminum flat tube, thus avoiding interference between the closing units and the cutting units.

[0013] As a further improvement of the present invention, the closing unit includes a closing base, a closing connecting rod, and a closing mold. The closing base is mounted on the closing gear, and one end of the closing connecting rod is connected to the closing base. One end of the closing mold faces the aluminum flat tube and has an arc-shaped groove that mates with the aluminum flat tube. The other end of the closing mold is connected to the other end of the closing connecting rod, and the closing mold slides in conjunction with a horizontally positioned closing slide rail. Because the closing mold in this invention slides in conjunction with the closing slide rail, it can only slide horizontally. The closing gear, through the closing base and the closing connecting rod, pushes or pulls the closing mold to move horizontally, thereby closing or loosening the aluminum flat tube. The arc-shaped groove on the closing mold mates with the aluminum flat tube, further improving the closing accuracy of the aluminum flat tube.

[0014] As a further improvement of the present invention, the cutting unit includes a cutting base, a cutting connecting rod, and a flattening device. The cutting base is mounted on the cutting gear; one end of the cutting connecting rod is connected to the cutting base; the surface of the flattening device facing the aluminum flat tube is horizontal, and a cutting tool is mounted on the flattening device; the other side of the flattening device is connected to the cutting connecting rod, and the flattening device slides in cooperation with a vertically arranged cutting slide rail. Because the flattening device in the present invention slides in cooperation with the cutting slide rail, it can only move vertically. The cutting gear, through the cutting base and the cutting connecting rod, pushes or pulls the flattening device to move vertically, thereby flattening, cutting, or loosening the aluminum flat tube.

[0015] In summary, the beneficial effects of this invention are: the end-capping dimensions of the aluminum flat tube are controllable and the end-capping efficiency is high. Through trial use, this invention improves the end-capping accuracy of the aluminum flat tube from the median value of ±0.3mm to ±0.1mm. The assembly problems of the flat tube and manifold caused by the end-capping dimensions and the leakage problems at the joint of the flat tube and manifold are greatly reduced. The production efficiency and yield of evaporator and condenser cores using the aluminum flat tubes with end-capping of this invention are significantly improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the existing technology of microchannel aluminum flat tubes being processed by first closing the end and then cutting it.

[0017] Figure 2 This is a schematic diagram of the eccentricity of the opening in the width and thickness directions of a microchannel aluminum flat tube in the prior art.

[0018] Figure 3 This is a schematic diagram of the present invention.

[0019] Figure 4 This is a schematic diagram of the automatic finishing device and the automatic detection device in this invention.

[0020] Figure 5 This is a schematic diagram of the microchannel aluminum flat tube in this invention from the point of closing to the point of breaking.

[0021] Figure 6 This is a schematic diagram of the closing device in this invention.

[0022] The components include: 1. End-closing device; 2. Aluminum flat tube; 3. Breaking device; 4. Cutting line; 5. Automatic finishing device; 6. Width finishing unit; 7. First fixed metal wheel; 8. First movable metal wheel; 9. Thickness finishing unit; 10. Second fixed metal wheel; 11. Second movable metal wheel; 12. Automatic detection device; 13. Width detection unit; 14. Thickness detection unit; 15. Rear clamping plate; 16. Upper fixed clamping plate; 17. Lower fixed clamping plate; 18. Front clamping plate; 19. Upper movable clamping plate; 20. Lower movable clamping plate; 2 1. Closing assembly; 22. Closing unit; 23. Cutting assembly; 24. Cutting unit; 25. Intermediate gear; 26. Closing gear; 27. Cutting gear; 28. Closing base; 29. ​​Closing connecting rod; 30. Closing mold; 31. Arc groove; 32. Closing slide rail; 33. Cutting base; 34. Cutting connecting rod; 35. Flattening device; 36. Cutting tool; 37. Cutting slide rail; 38. First lead screw; 39. First servo motor; 40. Second lead screw; 41. Second servo motor; 42. Drive motor. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. In the process of closing the aluminum flat tube 2, the direction in which the aluminum flat tube 2 is conveyed is the front-to-back direction (X-axis direction), the vertical direction is the thickness direction of the aluminum flat tube 2 (Z-axis direction), and the direction perpendicular to the front-to-back direction and the thickness direction is the width direction of the aluminum flat tube (Y-axis direction). Example 1

[0024] like Figure 3 and Figure 5 As shown, in the microchannel aluminum flat tube closing method of the present invention, the aluminum flat tube 2 passes through the closing device 1, and when the part of the aluminum flat tube 2 that needs to be closed is located inside the closing device 1, the conveying of the aluminum flat tube 2 is stopped. First, the closing device 1 closes the aluminum flat tube 2, and then the closing device 1 cuts the aluminum flat tube 2, creating a cutting line 4 at the cut part of the aluminum flat tube 2. The aluminum flat tube 2 does not break into two pieces after being cut, so it does not affect the overall conveying of the aluminum flat tube 2. Then, the closed and cut aluminum flat tube 2 is conveyed again. After the aluminum flat tube 2 has been conveyed to the set distance and reaches the breaking device 3, the conveying of the aluminum flat tube 2 is stopped. At this time, the part of the aluminum flat tube 2 located in the closing device 1 is another closing part. The closing device 2 closes and cuts the other closing part. At the same time, the breaking device 3 clamps the aluminum flat tube 2 from both sides of the cutting line 4 and pulls the aluminum flat tube 2 from the side away from the closing device 1, breaking the aluminum flat tube 2 from the cutting line 4. The closing process of the aluminum flat tube 2 is continued in this way. Example 2

[0025] This embodiment is a further improvement based on embodiment 1. Compared with embodiment 1, in this embodiment, before the aluminum flat tube 2 enters the closing device 1, the aluminum flat tube 2 is first finished by the automatic finishing device 5 in the width and thickness directions.

[0026] like Figure 3 and Figure 4 As shown, the automatic finishing device 5 used in this embodiment includes a width finishing unit 6 and a thickness finishing unit 9. The width finishing unit 6 has a first fixed metal wheel 7 and a first movable metal wheel 8 located on both sides of the aluminum flat tube 2 in the width direction. The first fixed metal wheel 7 and the first movable metal wheel 8 are both supported by wheel axles mounted on the frame (not shown in the figure) at their bottom ends, so that the first fixed metal wheel 7 and the first movable metal wheel 8 can rotate relative to the frame. The first movable metal wheel 8 can move on the frame. In this embodiment, a first linear guide (not shown in the figure) is provided on the frame along the width direction of the aluminum flat tube 2. The bottom end of the axle wheel on which the first movable metal wheel 8 is mounted adopts a first slider (not shown in the figure). The first lead screw 38 is mounted on the frame and is parallel to the first linear guide. The first lead screw 38 is threadedly engaged with the shaft wheel on which the first movable metal wheel 8 is mounted and is connected to the output shaft of the first servo motor 39 mounted on the frame. The first servo motor 39 drives the first lead screw 38 to rotate, and the first lead screw 38 drives the first movable metal wheel 8 to move toward or away from the fixed metal wheel 7, thereby adjusting the distance between the first movable metal wheel 8 and the first fixed metal wheel 7. The movement of the first movable metal wheel 8 toward or away from the first fixed metal wheel 7 is used to adjust the aluminum flat tube 2 passing between the first fixed metal wheel 7 and the first movable metal wheel 8 in the width direction.

[0027] like Figure 3 and Figure 4As shown, the thickness finishing unit 9 in this embodiment has a second fixed metal wheel 10 and a second movable metal wheel 11 located on both sides of the aluminum flat tube 2 in the thickness direction of the aluminum flat tube 2, respectively. That is, in this embodiment, the second movable metal wheel 11 and the second fixed metal wheel 10 are located above and below the aluminum flat tube 2, respectively. In this embodiment, both ends of the second fixed metal wheel 10 are rotatably connected to the frame (not shown in the figure) by bearings, and are used to support the lower surface of the aluminum flat tube 2 in the use state. Each end of the second movable metal wheel 11 is rotatably provided with a second slider (not shown in the figure). A second linear guide (not shown in the figure) is installed on each of the left and right sides of the frame. The second slider slides in cooperation with the second linear guide. A second lead screw 40 is rotatably installed on each of the left and right sides. The second lead screw 40 passes through the second slider and is threadedly engaged with the second slider. The end of the second lead screw 40 is connected to the output shaft of the second servo motor 41 mounted on the frame. In this embodiment, the two second servo motors 41 located on both sides of the frame rotate synchronously in the same direction. They are used to synchronously drive the second movable metal wheel 11 to move up and down from both ends. The up and down movement of the second movable metal wheel 11 is used to adjust the distance between it and the second fixed metal wheel 10. The movement of the second movable metal wheel 11 toward or away from the second fixed metal wheel 10 is used to adjust the thickness of the aluminum flat tube 2 passing between the second fixed metal wheel 10 and the second movable metal wheel 11.

[0028] like Figure 3 and Figure 4 As shown, this embodiment includes an automatic detection device 12, which comprises a width detection unit 13 and a thickness detection unit 14. The width detection unit 13 is mounted on a frame and is used to detect the width of the aluminum flat tube 2. In this embodiment, the width detection unit 13 is a laser width measuring instrument, which is existing technology and will not be described in detail in this embodiment. In this embodiment, both the width detection unit 13 and the first servo motor 39 are connected to a controller, which is a PLC. The first movable metal wheel 8 adjusts towards or away from the first fixed metal wheel 7 according to the width of the aluminum flat tube 2 detected by the width detection unit 13. If the width of the aluminum flat tube 2 exceeds the preset width range of the aluminum flat tube (e.g., 1...), the thickness detection unit 14 will adjust the width of the aluminum flat tube 2. When the width of the aluminum flat tube 2 is less than 2±0.005mm, the first servo motor 39 drives the first movable metal wheel 8 to move towards the first fixed metal wheel 7, reducing the distance between the first movable metal wheel and the first fixed metal wheel 7, thereby reducing the width of the aluminum flat tube 2. If the detected width of the aluminum flat tube 2 is less than the preset width range of the aluminum flat tube (such as 12±0.005mm), it indicates that the distance between the first movable metal wheel 8 and the first fixed metal wheel 7 is too small. The first servo motor 39 needs to drive the first movable metal wheel 8 to move away from the first fixed metal wheel 7 to increase the distance between the first movable metal wheel 8 and the first fixed metal wheel 7 and reduce the compression on the width of the aluminum flat tube 2.

[0029] In this embodiment, the thickness detection unit 14 is mounted on the frame to detect the thickness of the aluminum flat tube 2. The thickness detection unit 14 is a laser thickness gauge, and both the laser thickness gauge and the second servo motor 41 are connected to the controller. The second movable metal wheel 11 adjusts towards or away from the second fixed metal wheel 10 according to the thickness of the aluminum flat tube 2 detected by the thickness detection unit 14. When the thickness detection unit 14 detects that the thickness of the aluminum flat tube 2 is greater than a preset thickness range (e.g., 1.4 ± 0.005 mm), the second servo motor 41 drives the second movable metal wheel 11 to move towards the second fixed metal wheel 10. The distance between the second movable metal wheel 11 and the second fixed metal wheel 10 is reduced to compress the aluminum flat tube 2 and reduce its thickness. When the thickness detection unit 14 detects that the thickness of the aluminum flat tube 2 is less than the preset thickness range of the aluminum flat tube (e.g., 1.4 ± 0.005 mm), it indicates that the distance between the second movable metal wheel 11 and the second fixed metal wheel 10 is too small. The distance between the second movable metal wheel 11 and the second fixed metal wheel 10 needs to be increased to reduce the compression on the thickness of the aluminum flat tube 2. The second servo motor 41 drives the second movable metal wheel 11 to move away from the second fixed metal wheel 10. Example 3

[0030] like Figure 3 and Figure 5 As shown, this embodiment is a further improvement on embodiment 2. Compared with embodiment 2, the tear-off device 3 in this embodiment includes a rear clamping plate 15 and a front clamping plate 18. The rear clamping plate 15 has an upper fixed clamping plate 16 and a lower fixed clamping plate 17. The lower fixed clamping plate 17 is fixed on the frame, and the upper fixed clamping plate 16 can move up and down relative to the lower fixed clamping plate 17. The left and right ends of the upper fixed clamping plate 16 can be slidably connected to the frame by sliding and sliding cooperation with the guide rail. The upper fixed clamping plate 16 can be driven to move up and down by a cylinder or a hydraulic cylinder. In this embodiment, the up and down movement of the upper fixed clamping plate 16 can release or clamp the aluminum flat tube 2 from the rear side of the cutting line 4.

[0031] like Figure 3 and Figure 5As shown, in this embodiment, the front clamping plate 18 has an upper movable clamping plate 19 and a lower movable clamping plate 20. A movable seat is slidably mounted on the frame using a guide rail and a slider. The movable seat is driven by a hydraulic cylinder or a pneumatic cylinder mounted on the frame to move horizontally in the front-back direction. The left and right ends of the lower movable clamping plate 20 are fixed on the movable seat. The upper movable clamping plate 19 can move up and down relative to the lower movable clamping plate 20. In this embodiment, the left and right ends of the upper movable clamping plate 19 are slidably mounted on the movable seat using a guide rail and a slider. It is driven by a hydraulic cylinder or a pneumatic cylinder mounted on the movable seat to move vertically on the movable seat. The up-and-down movement of the upper movable clamping plate 19 can release or clamp the aluminum flat tube 2 from the front side of the cutting line 4. The upper movable clamping plate 19 and the lower movable clamping plate 20 can move in the front-back direction to break the aluminum flat tube 2.

[0032] In this embodiment, with the rear clamping plate 15 and the front clamping plate 18 clamping the aluminum flat tube 2 from the rear and front sides of the cutting line 4 respectively, the front clamping plate 18 moves forward to pull the aluminum flat tube 2 off the cutting line 4. Example 4

[0033] This embodiment is a further improvement on embodiment 3. Compared to embodiment 3, the closing device 1 in this embodiment is as follows: Figure 6 As shown, it includes a closing assembly 21, a cutting assembly 23, an intermediate gear 25, two closing gears 26, two cutting gears 27, and a drive device.

[0034] like Figure 6 As shown, the sealing assembly 21 in this embodiment has two sealing units 22 located on the left and right sides of the aluminum flat tube 2 respectively in use. The two sealing units 22 are close to each other and squeeze the aluminum flat tube 2 from the left and right sides of the aluminum flat tube 2 to seal the aluminum flat tube 2. The two sealing units 22 are far apart from each other to loosen the sealed aluminum flat tube 2. The cutting assembly 23 has two cutting units 24 located on the upper and lower sides of the aluminum flat tube 2 respectively in use. The two cutting units 24 are close to each other to flatten the upper and lower surfaces of the aluminum flat tube 2 and cut cutting lines 4 on the aluminum flat tube 2. The two cutting units 24 are far apart from each other to loosen the aluminum flat tube 2.

[0035] like Figure 6As shown, in this embodiment, the intermediate gear 25 has a channel for the aluminum flat tube 2 to pass through along the center line. A tubular mounting shaft is fixed to the intermediate gear 25, allowing the aluminum flat tube 2 to pass through. The mounting shaft is rotatably mounted on the frame using at least one bearing. Two converging gears 26 are located on the left and right sides of the intermediate gear 25 and are rotatably mounted to the frame. Both converging gears 26 mesh with the intermediate gear 25. Two converging units 22 are respectively mounted on the two converging gears 26. The rotation of the two converging gears 26 drives two converging units. The cutting units 22 move closer to or further away from each other to clamp the aluminum flat tube 2 to close the end of the aluminum flat tube 2 or to loosen the aluminum flat tube 2. In this embodiment, the two cutting gears 27 are located on the upper and lower sides of the middle gear 25 and are rotatably mounted with the frame. The two cutting gears 27 mesh with the middle gear 25. The two cutting units 24 are respectively mounted on the two cutting gears 27. The rotation of the two cutting gears 27 is used to drive the two cutting units 24 to move closer to or further away from each other to flatten the aluminum flat tube 2 and cut the cutting line 4 on the aluminum flat tube 2 or to loosen the aluminum flat tube 2.

[0036] like Figure 6 As shown, in this embodiment, the driving device is connected to any one of the two closing gears 26 and the two cutting gears 27, and is used to drive the intermediate gear 25, the closing gear 26 and the cutting gear 27 to rotate. In this embodiment, the driving device is a drive motor 42. The output shaft of the drive motor 42 is connected to the rotation shaft of the lower cutting gear 27. The drive motor 42 drives the lower cutting gear 27 to rotate, which drives the intermediate gear 25 to rotate. The other cutting gear 27 and the two closing gears 27 rotate simultaneously. In this embodiment, the rotation direction and rotation speed of the two closing gears 27 and the two cutting gears 27 are the same, while the rotation direction of the intermediate gear 25 is opposite to that of the closing gear 27.

[0037] like Figure 6As shown, the closing unit 22 in this embodiment includes a closing base 28, a closing connecting rod 29, and a closing mold 30. A closing groove (not shown in the figure) is formed vertically on the closing base 28. A closing shaft (not shown in the figure) is eccentrically arranged on the closing gear 26. The closing shaft is fixedly connected to the closing gear 26, and the center line of the closing shaft is parallel to the center line of the closing gear 26. The closing shaft extends into the closing groove and rotates with the closing gear 26. While rotating, the closing shaft pushes the closing base 28 to move horizontally within the closing groove. The closing connecting rod 29 is arranged horizontally... The closing mold 30 is positioned with one end fixedly connected to the closing base 28. One end of the closing mold 30 faces the aluminum flat tube 2 and is provided with an arc groove 31 that matches the aluminum flat tube 2. The other end of the closing mold 30 is fixedly connected to the other end of the closing connecting rod 29. The closing base 28 pushes the closing mold 30 to move horizontally through the closing connecting rod 29. The closing mold 30 slides in cooperation with the closing slide rail 32 that is horizontally set on the frame, so that the closing base 28, the closing connecting rod 20 and the closing mold 30 can only move in the horizontal direction and cannot move or rotate in the vertical direction.

[0038] like Figure 6 As shown, the cutting unit 24 in this embodiment includes a cutting base 33, a cutting connecting rod 34, and a flattening device 35. The cutting base 33 has a horizontally oriented cutting groove (not shown in the figure). A cutting shaft (not shown in the figure) is eccentrically mounted on the cutting gear 27, extending into the cutting groove. The cutting shaft rotates with the cutting gear 27, and while rotating, it pushes the cutting base 33 vertically within the cutting groove. The cutting connecting rod 34 is vertically oriented, and one end is fixedly connected to the cutting base 33. The flattening device 35 is long... The cube-shaped structure has a horizontal surface on the side facing the aluminum flat tube 2. A cutting blade 36 is installed on the side of the flattening device 35 facing the aluminum flat tube 2. The cutting blade 36 is a blade with its length direction consistent with the left and right direction. The other side of the flattening device 35 is fixedly connected to the cutting connecting rod 34. The flattening device 35 is slidably engaged with the cutting slide rail 37 vertically set on the frame, so that the cutting base 33, the cutting connecting rod 34 and the flattening device 35 can only move in the vertical direction, and cannot move or rotate in the horizontal direction.

[0039] In this embodiment, when the two closing units 22 are close to each other, the two cutting units 24 are far apart from each other, and when the two closing units 22 are far apart from each other, the two cutting units 24 are close to each other. Thus, when the aluminum flat tube 2 is closing, the two cutting units 24 do not contact the aluminum flat tube 2, and when the two cutting units 24 flatten and cut the aluminum flat tube 2, the two closing units 22 do not contact the aluminum flat tube 2. That is, in this embodiment, when the closing shaft on the closing gear 26 is closest to the intermediate gear 25, the cutting shaft on the cutting gear 27 is farthest from the intermediate gear 25.

[0040] In this embodiment, the closing device 1 operates as follows: two closing gears 26 rotate synchronously, driving two closing units 22 to move towards each other. After the closing mold 30 of the closing unit 22 contacts the aluminum flat tube 2, the two closing units 22 continue to move towards each other until the distance between the closing shaft and the intermediate gear 25 is closest. During this process, the closing mold 30 squeezes the aluminum flat tube 2 to produce a closing effect. At the same time, two cutting gears 27 drive two cutting units 24 away from the aluminum flat tube 2. When the distance between the closing shaft on the closing gear 26 and the intermediate gear 25 is closest, the distance between the cutting shaft on the cutting gear 27 and the intermediate gear 25 reaches its maximum. After the end is closed, the two closing gears 26 continue to rotate, driving the two closing units 22 to move away from each other and releasing the aluminum flat tube 2. During this process, the two cutting gears 27 continue to rotate, driving the two cutting units 24 to move towards each other. The two cutting units 24 cut the aluminum flat tube 2, cutting a cutting line on the aluminum flat tube 2. The total depth of the cutting lines on the upper and lower parts of the aluminum flat tube 2 is slightly less than the thickness of the aluminum flat tube 2, so that the aluminum flat tube 2 is not completely cut off. The depth of the cutting line can be adjusted by the cutting tool 36 as needed. When the cutting tool 36 cuts the aluminum flat tube 2, the flattening device 35 flattens the aluminum flat tube 2. Example 5

[0041] This embodiment is a further improvement on embodiment 4. Compared to embodiment 4, this embodiment has a closing circular hole (not shown in the figure) on the closing base 28 connected to the closing shaft, allowing the closing base 28 and the closing gear 26 to rotate relative to each other. One end of the closing connecting rod 29 is rotatably connected to the closing base 28, and the other end of the closing connecting rod 29 is rotatably connected to the closing mold 30. Since the closing mold 30 can only move horizontally, when the closing gear 26 drives the closing base 28 to rotate, the closing connecting rod 29 swings, thereby pushing or pulling the closing base 28 to move horizontally. In this embodiment, the cutting base 33 also has a circular hole cut on it and connected to the cutting shaft, allowing the cutting base 33 to rotate relative to the cutting gear 27. One end of the cutting connecting rod 34 is rotatably connected to the cutting base 33, and the other end of the cutting connecting rod 34 is rotatably connected to the flattening device 35. Since the flattening device 35 can only move vertically, when the cutting gear 27 drives the cutting base 33 to rotate, the cutting connecting rod 34 swings, pulling or pushing the flattening device 35 to move vertically. The structure of the remaining parts in this embodiment is the same as that in Embodiment 4, and will not be described again in this embodiment.

[0042] Unless otherwise specified in the above description, all parts are prior art, or can be implemented using existing technology. Furthermore, the specific embodiments described in this invention are merely preferred embodiments and are not intended to limit the scope of this invention. That is, all equivalent changes and modifications made within the scope of this invention should be considered within the technical scope of this invention.

Claims

1. A method for closing a microchannel aluminum flat tube, characterized in that, The aluminum flat tube (2) is closed and cut by the closing device (1), and then the closed and cut aluminum flat tube (2) is transported. After the aluminum flat tube (2) is closed and cut, it is transported to a set distance. The aluminum flat tube (2) is clamped from both sides of the cutting line (4) by the breaking device (3), and the aluminum flat tube (2) is broken from the cutting line (4) by the breaking device (3).

2. The method for closing the microchannel aluminum flat tube according to claim 1, characterized in that, Before the aluminum flat tube (2) enters the closing device (1), the aluminum flat tube (2) is first finished by the automatic finishing device (5) in the width and thickness directions.

3. The method for closing the microchannel aluminum flat tube according to claim 2, characterized in that, The automatic finishing device (5) includes The width adjustment unit (6) has a first fixed metal wheel (7) and a first movable metal wheel (8) located on both sides of the aluminum flat tube (2) in the width direction of the aluminum flat tube (2), respectively. The first movable metal wheel (8) moves toward or away from the first fixed metal wheel (7) to adjust the aluminum flat tube (2) passing between the first fixed metal wheel (7) and the first movable metal wheel (8) in the width direction. And a thickness finishing unit (9) having a second fixed metal wheel (10) and a second movable metal wheel (11) located on both sides of the aluminum flat tube (2) in the thickness direction, the second movable metal wheel (11) moving toward or away from the second fixed metal wheel (10) for adjusting the aluminum flat tube (2) passing between the second fixed metal wheel (10) and the second movable metal wheel (11) in the thickness direction.

4. The method for closing the microchannel aluminum flat tube according to claim 3, characterized in that, It also includes an automatic detection device (12), which includes Width detection unit (13) is used to detect the width of aluminum flat tube (2). The first movable metal wheel (8) is adjusted to face or move away from the first fixed metal wheel (7) according to the width of aluminum flat tube (2) detected by width detection unit (13). In addition, a thickness detection unit (14) is used to detect the thickness of the aluminum flat tube (2), and the second movable metal wheel (11) is adjusted to face or move away from the second fixed metal wheel (10) according to the thickness of the aluminum flat tube (2) detected by the thickness detection unit (14).

5. The method for closing the microchannel aluminum flat tube according to claim 1, characterized in that, The breaking device (3) includes The rear clamp (15) has an upper fixed clamp (16) and a lower fixed clamp (17). The upper fixed clamp (16) can move up and down relative to the lower fixed clamp (17). The upper fixed clamp (16) can be released or clamped from the back of the cutting line (4) when it moves up and down. And, the front clamping plate (18) has an upper movable clamping plate (19) and a lower movable clamping plate (20). The upper movable clamping plate (19) can move up and down relative to the lower movable clamping plate (20). The upper movable clamping plate (19) can move up and down to release or clamp the aluminum flat tube (2) from the front side of the cutting line (4). The upper movable clamping plate (19) and the lower movable clamping plate (20) can move in the front and back directions. When the rear clamping plate (15) and the front clamping plate (18) clamp the aluminum flat tube (2) from the rear side and the front side of the cutting line (4) respectively, the front clamping plate (18) moves forward to pull the aluminum flat tube (2) off from the cutting line (4).

6. The method for closing the microchannel aluminum flat tube according to claim 1, characterized in that, Closing device (1) includes The closing assembly (21) has two closing units (22) located on the left and right sides of the aluminum flat tube (2) respectively in use. The two closing units (22) are close to each other to close the aluminum flat tube (2), and the two closing units (22) are far apart to loosen the aluminum flat tube (2). And, the cutting assembly (23) has two cutting units (24) located on the upper and lower sides of the aluminum flat tube (2) respectively in use. The two cutting units (24) are close to each other to cut a cutting line (4) on the aluminum flat tube, and the two cutting units (24) are far apart to loosen the aluminum flat tube (2).

7. The method for closing the microchannel aluminum flat tube according to claim 6, characterized in that, The closing device (1) also includes The intermediate gear (25) has an aluminum flat tube (2) channel opened along the center line for the aluminum flat tube (2) to pass through; Two closing gears (26) are located on the left and right sides of the middle gear (25) and mesh with the middle gear (25). Two closing units (22) are respectively mounted on the two closing gears (26). The rotation of the two closing gears (26) is used to drive the two closing units (22) to move closer to each other or further away from each other. Two cutting gears (27) are located on the upper and lower sides of the intermediate gear (25) and mesh with the intermediate gear (25). Two cutting units (24) are respectively mounted on the two cutting gears (27). The rotation of the two cutting gears (27) is used to drive the two cutting units (24) to move closer to each other or further away from each other. And a drive unit, which is connected to either of the two closing gears (26) and the two cutting gears (27) for driving the intermediate gear (25), the closing gear (26) and the cutting gear (27) to rotate.

8. The method for closing the microchannel aluminum flat tube according to claim 7, characterized in that, When the two closing units (22) are close to each other, the two cutting units (24) are far apart from each other; when the two closing units (22) are far apart from each other, the two cutting units (24) are close to each other.

9. The method for closing the microchannel aluminum flat tube according to claim 6, characterized in that, The closing unit (22) includes A closing base (28) is mounted on a closing gear (26); The constriction connecting rod (29) has one end connected to the constriction base (28); In addition, the closing mold (30) is set with one end facing the aluminum flat tube (2) and is provided with an arc groove (31) that cooperates with the aluminum flat tube (2). The other end of the closing mold (30) is connected to the other end of the closing connecting rod (29). The closing mold (30) is slidably engaged with the horizontally set closing slide rail (32).

10. The method for closing the microchannel aluminum flat tube according to claim 6, characterized in that, The cutting unit (24) includes A cutting base (33) is mounted on the cutting gear (27); A cutting connecting rod (34) is connected at one end to a cutting base (33); In addition, the flattening device (35) has a horizontal surface facing the aluminum flat tube (2), and a cutting tool (36) is installed on the flattening device (35). The other side of the flattening device (35) is connected to the cutting connecting rod (34), and the flattening device (35) slides in cooperation with the vertically arranged cutting slide rail (37).

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