Necking device of aluminum flat pipe for air conditioner
By designing a multifunctional aluminum flat tube necking device, the problem of device diversity caused by different insertion depth requirements was solved, resulting in a reduction in the number of devices and cost, while ensuring the quality of the aluminum flat tube.
Patent Information
- Application Number
- CN202520316267.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-25
AI Technical Summary
In the existing technology, different air conditioning equipment requires aluminum flat tubes with different insertion depths, which leads to the need to equip multiple sets of necking devices, increasing the cost of equipment purchase and maintenance, and resulting in low device utilization.
An aluminum flat tube shrinking device was designed, which includes an operating table, a processing area, a working area, and a mold assembly. Through the cooperation of a pressing cylinder and a shrinking cylinder, the aluminum flat tube can be squeezed and rotated to shrink in multiple directions. The mold assembly can form shrinkage of different lengths as needed, and scratches and indentations are avoided by guide grooves and rubber pads.
The number of necking devices was reduced, the utilization rate of the devices was improved, the purchase and maintenance costs were reduced, and the quality of the aluminum flat tubes was not damaged.
Smart Images
Figure CN223862685U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a necking device for aluminum flat tubes used in air conditioning. Background Technology
[0002] Due to their strong heat dissipation performance, porous aluminum flat tubes are widely used in the coolant circulation pipes of various air conditioners. In use, multiple aluminum flat tubes need to be inserted into the manifold and welded into a box-like structure. To facilitate limiting the insertion depth and ensure it is guaranteed, the insertion end of the aluminum flat tube needs to be narrowed. In existing technology, a narrowing mold with a set narrowing length is generally used to extrude and narrow the insertion end of the aluminum flat tube. However, since different air conditioning equipment requires different insertion depths, a narrowing device is needed for each insertion depth, resulting in a large number of narrowing devices and reduced utilization. This not only increases the purchase cost of the equipment but also raises the management and maintenance costs. Therefore, it is necessary to reduce the number of narrowing devices. Utility Model Content
[0003] To reduce the number of necking devices, this utility model proposes a necking device for aluminum flat tubes used in air conditioners. It includes an operating table with a processing area formed on the table. Two working areas are formed on either side of the processing area along a first axial direction. A mold assembly is provided in each working area. Each mold assembly includes a necking cylinder and a necking mold. The cylinder barrel of the necking cylinder is fixedly installed in the working area, and the piston rod of the necking cylinder extends along a second axial direction. The necking mold is installed at the end of the piston rod of the necking cylinder. The necking mold includes a wheel-shaped body with a vertically extending shaft hole. A radially recessed groove is formed on the outer circumferential surface of the body, and this groove has a forming surface. This groove is used to neck the aluminum flat tube. The necking mold is rotatably mounted on the piston rod of the necking cylinder via a rotating shaft. The processing area is used to place the aluminum flat tube. When the aluminum flat tube is placed in the processing area, its length extends along the second axial direction.
[0004] A clamping cylinder is installed above the processing area to clamp the aluminum flat tube placed in the processing area; the first axis direction and the second axis direction both extend horizontally and are perpendicular to each other.
[0005] When this application is in operation, the aluminum flat tube is first placed on the processing area, extending along the second axis in its length direction. The clamping cylinder is activated, causing its second piston rod to extend downwards, pressing the aluminum flat tube firmly onto the processing area to prevent movement. The necking cylinder is then activated, causing its first piston rod to extend and move the necking mold. When the necking mold presses against both sides of the aluminum flat tube in its width direction, the mold begins to rotate, extruding and necking the aluminum flat tube until the necking length reaches the set length. Then, the first piston rod of the necking cylinder retracts and disengages from the aluminum flat tube. Finally, the second piston rod of the clamping cylinder retracts, releasing the aluminum flat tube, completing the necking of one aluminum flat tube. This application allows for the formation of necks of different lengths on different aluminum flat tubes as needed, effectively reducing the number of necking devices required, increasing their utilization rate, and thereby lowering the purchase cost of the necking devices, as well as reducing equipment management and maintenance costs.
[0006] Meanwhile, because the shrinking mold rotates while shrinking the aluminum flat tube, scratches will not be caused in the shrinking area due to friction, thus avoiding affecting the quality of the aluminum flat tube.
[0007] Furthermore, to prevent the shrinking mold from shifting away from the aluminum flat tube along the first axis direction due to the reaction force of the aluminum flat tube during the shrinking process, a guide groove extending along the second axis direction is provided in the working area, and the lower end of the rotating shaft is formed as a guide rod, which is slidably inserted into the guide groove.
[0008] Furthermore, to avoid indentations when pressing the aluminum flat tube, the piston rod of the pressing cylinder extends downward in the vertical direction, and a pressing plate is installed at the end of the piston rod of the pressing cylinder. The pressing plate has a lower side surface that is parallel to the upper surface of the processing area.
[0009] Furthermore, to completely avoid indenting the aluminum flat tube, a rubber pad is bonded to the lower surface of the clamping plate. The rubber pad can apply relatively uniform pressure to the aluminum flat tube and eliminate uneven pressure caused by leveling errors on the lower side of the clamping plate.
[0010] Furthermore, in order to generate a stable pushing force on the necking mold and avoid tilting, a U-shaped frame is fixedly installed at the end of the piston rod of the necking cylinder. The U-shaped frame has a U-shaped groove with an opening facing away from the necking cylinder, and the necking mold is installed in the U-shaped groove. Attached Figure Description
[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.
[0012] Figure 2 yes Figure 1 The top view shown in the attached figure.
[0013] Figure 3 yes Figure 1 The illustrated embodiment is shown in a state diagram during operation. Detailed Implementation
[0014] See Figure 1 , Figure 2 and Figure 3 In the attached figure, the direction of the first axis X indicates the direction of the first axis, and the direction of the second axis Y indicates the direction of the second axis. Both the first axis direction and the second axis direction extend horizontally and are perpendicular to each other.
[0015] A device for reducing the diameter of aluminum flat tubes for air conditioning includes an operating table 10, on which a processing area 12 is formed. The processing area 12 is a rectangular boss protruding upward from the center of the operating table 10. A working area 11 is formed on both sides of the processing area 12 along a first axial direction.
[0016] The processing area 12 is used to place the aluminum flat tube 50. When the aluminum flat tube 50 is placed in the processing area, its length extends along the second axis. A mold assembly 20 is provided in each working area 11.
[0017] Each mold assembly 20 includes a necking cylinder 24 and a necking mold 21. The first cylinder barrel 241 of the necking cylinder 24 is fixedly installed on the working area, and the first piston rod 242 of the necking cylinder 24 extends along the second axis.
[0018] A U-shaped frame 23 is fixedly installed at the end of the first piston rod 242 of the necking cylinder. The U-shaped frame has a U-shaped groove with an opening facing away from the necking cylinder, and the necking mold is installed in the U-shaped groove. That is, the necking mold is installed at the end of the piston rod of the necking cylinder.
[0019] The necking mold 21 includes a wheel-shaped body 211 with a shaft hole 214 extending in the vertical direction. A radially recessed groove 212 is formed on the outer peripheral surface of the body 211. The groove 212 has a forming surface 213. The groove 212 is used to neck the aluminum flat tube. The necking mold 21 is rotatably mounted on a U-shaped frame via a rotating shaft 25. A fixing nut 26 is screwed onto the rotating shaft.
[0020] Each working area is provided with a guide groove 14 extending along the second axis. The lower end of the rotating shaft 25 is formed as a guide rod 27, which is slidably inserted into the guide groove. Driven by the necking cylinder, the necking mold can reciprocate along the second axis.
[0021] A clamping cylinder 30 is installed above the processing area. This clamping cylinder is used to clamp the aluminum flat tube placed on the processing area. The second cylinder barrel 31 of the clamping cylinder 30 is fixedly installed on the frame 40. The second piston rod 32 of the clamping cylinder 30 extends downward in the vertical direction. A clamping plate 33 is installed at the end of the second piston rod of the clamping cylinder. The clamping plate has a lower side parallel to the upper surface of the processing area. A rubber pad 34 is bonded to the lower surface of the clamping plate.
[0022] When this embodiment is in operation, the aluminum flat tube 50 is first placed on the processing area 12, and the length direction of the aluminum flat tube 50 extends along the second axis. The clamping cylinder is activated, causing the second piston rod of the clamping cylinder to extend downwards. The clamping plate presses the aluminum flat tube 50 firmly onto the processing area to prevent movement. The two necking cylinders are then activated, causing the first piston rod of the necking cylinder to extend and drive the necking mold to move. When the necking mold presses against both sides of the aluminum flat tube in the width direction, the necking mold begins to rotate and squeezes the aluminum flat tube to form a neck until the necking length reaches the set length. Then, the first piston rod of the necking cylinder is retracted and detached from the aluminum flat tube. Finally, the second piston rod of the clamping cylinder is retracted, causing the clamping plate to leave the aluminum flat tube, completing the necking of one aluminum flat tube.
Claims
1. A necking device for an aluminum flat tube used in air conditioning, characterized in that, The device includes an operating table with a processing area formed on the operating table. Two work areas are formed on either side of the processing area along a first axial direction. A mold assembly is provided in each work area. Each mold assembly includes a necking cylinder and a necking mold. The cylinder barrel of the necking cylinder is fixedly installed in the work area, and the piston rod of the necking cylinder extends along a second axial direction. The necking mold is installed at the end of the piston rod of the necking cylinder. The necking mold includes a wheel-shaped body with a vertically extending shaft hole. A radially recessed groove is formed on the outer circumferential surface of the body, and the groove has a forming surface. The groove is used to neck aluminum flat tubes. The necking mold is rotatably mounted on the piston rod of the necking cylinder via a rotating shaft. The processing area is used to place aluminum flat tubes. When the aluminum flat tube is placed in the processing area, its length extends along the second axial direction. A clamping cylinder is installed above the processing area to clamp the aluminum flat tube placed in the processing area; the first axis direction and the second axis direction both extend horizontally and are perpendicular to each other.
2. The necking device according to claim 1, characterized in that, A guide groove extending along the second axis is provided in the working area, and the lower end of the rotating shaft is formed as a guide rod, which is slidably inserted into the guide groove.
3. The necking device according to claim 1, characterized in that, The piston rod of the clamping cylinder extends downward in a vertical direction, and a clamping plate is installed at the end of the piston rod of the clamping cylinder. The clamping plate has a lower side surface that is parallel to the upper surface of the processing area.
4. The necking device according to claim 3, characterized in that, A rubber pad is bonded to the lower surface of the clamping plate.
5. The necking device according to claim 1, characterized in that, A U-shaped frame is fixedly installed at the end of the piston rod of the necking cylinder. The U-shaped frame has a U-shaped groove with an opening facing away from the necking cylinder, and the necking mold is installed in the U-shaped groove.