Numerical control pipe expanding and brushing machine for air conditioner liquid reservoir

Abstract

The application discloses a numerical control pipe expanding and brushing polishing machine for an air conditioner liquid accumulator, and relates to the technical field of refrigeration equipment. The numerical control pipe expanding and brushing polishing machine comprises a rack, a material distribution and transfer assembly, a pipe expanding station and a brushing polishing station. The pipe expanding station comprises a pipe expanding device. The pipe expanding device comprises a pipe expanding positioning assembly, a pipe pressing assembly and a pipe expanding buffer assembly. The pipe expanding positioning assembly is provided with a guide part extending into the workpiece to position the workpiece and a pipe expanding die used for expanding the pipe opening. The pipe pressing assembly can press the workpiece downward to move the workpiece relative to the pipe expanding die to realize downward pipe expanding. The pipe expanding buffer assembly is connected to the top of the pipe expanding positioning assembly and is used for buffering downward movement of the workpiece when the workpiece is subjected to external force and driving the workpiece to reset when the external force disappears. The brushing polishing station comprises a brushing polishing device. The brushing polishing device comprises a brushing polishing assembly and an adjusting assembly. The brushing polishing assembly is provided with a polishing wheel. The adjusting assembly is arranged on one side of the brushing polishing assembly and can make the workpiece sleeved on the outside of the polishing wheel and drive the workpiece to move up and down relative to the polishing wheel.

Description

Technical Field

[0001] This application belongs to the field of refrigeration equipment technology, specifically relating to a CNC tube expansion and polishing machine for air conditioning liquid receivers. Background Technology

[0002] In practical applications, air conditioning liquid receivers require flaring on one side to facilitate the pressing of partitions or filters. However, in existing technologies, the workpiece is typically fixed in a lower fixture, while an upper flaring die moves downwards under the drive of a press, squeezing the workpiece opening and causing plastic deformation to form the receiver. This structure is prone to the following problems: Firstly, traditional methods require additional clamping components to hold the workpiece in place; otherwise, the workpiece will be mispositioned and stamping will not be completed. During the clamping process, excessive clamping force will cause the workpiece to bend or deform, while insufficient clamping force will lead to unstable workpiece positioning. This can cause the workpiece to skew when the upper pressure tube assembly presses down, or even result in scrapping. Moreover, the walls of the reservoir are relatively thin, and the workpiece itself is not very rigid. If the clamping force is insufficient, the workpiece may be crushed, bent, or slip in the clamp, making it prone to deformation or displacement. The enormous downward pressure of the mold is entirely borne by the workpiece and the clamping unit, which can easily damage the mold or even cause the workpiece to become defective, potentially leading to scrapping.

[0003] Secondly, the guide clearance of the press slide, mold installation errors, and fixture positioning errors all directly affect the alignment between the mold and the workpiece. Since the mold is in motion, its trajectory is difficult to guarantee ideal coaxiality with the workpiece, easily leading to asymmetrical flaring and uneven wall thickness (one side thinner than the other), severely impacting product quality and sealing performance. This results in cumulative errors throughout the system, leading to poor alignment and coaxiality.

[0004] Furthermore, metal shavings or lubricant generated during the extrusion process can be trapped in the workpiece and mold cavity by the downward-moving die, making them difficult to remove. The shavings may be pressed into the workpiece surface, causing surface scratches, pits, and other defects, affecting the smoothness and corrosion resistance.

[0005] Furthermore, traditional molds, in order to accommodate workpieces of different sizes, require a conical structure with a diameter that matches the flaring shape of the workpiece. This demands extremely high taper accuracy from the cone, as the cone's tip needs to be pressed downwards into the workpiece to expand the tube at the workpiece's end. This necessitates very precise height and diameter dimensions for the cone, since the stamping section, which performs the stamping action, is actually the portion of the cone's diameter larger than the workpiece's opening. When the cone's tip enters the workpiece, its circumference hasn't yet immediately contacted the workpiece's end. Given that the workpiece is a thin liquid reservoir for air conditioners, this sudden contact with the cone's side creates downward pressure, easily leading to uneven outward expansion of the thin-walled tube opening. This can result in localized buckling, causing the opening to collapse, wrinkle, or twist, rather than forming a smooth flare. Moreover, while the cone's tip provides some guidance and alignment, it cannot fully compensate for the combined errors of the equipment, fixtures, and mold itself. Even a slight deviation between the mold centerline and the workpiece centerline can amplify the problem, leading to asymmetrical flaring, with one side flaring larger than the other, resulting in uneven wall thickness and severely impacting the product's sealing performance and connection strength. Summary of the Invention

[0006] This application provides a CNC tube flaring and polishing machine for air conditioning liquid receivers to solve the above-mentioned technical problems, such as the need for additional clamping parts to hold the workpiece, excessive clamping force leading to workpiece deformation, and insufficient clamping force leading to inaccurate workpiece positioning, which can easily cause bending deformation under subsequent stamping; the mold is moving, and its movement trajectory is difficult to guarantee ideal coaxiality with the workpiece, which can easily lead to asymmetrical flaring and uneven wall thickness; the circumferential surface of the cone has not yet contacted the end of the workpiece, and the workpiece is relatively thin. When it suddenly contacts the side of the cone, the downward pressure can easily cause the thin-walled tube opening to expand outward unevenly, resulting in local buckling, and the tube opening being crushed, wrinkled, or twisted, rather than forming a smooth flaring.

[0007] The technical solution adopted in this application is as follows: A CNC tube-expanding and polishing machine for air conditioning liquid receivers, comprising: The frame has a material transfer assembly for conveying workpieces connected to its first side, and a pipe expansion station and a polishing station connected to its second side along the workpiece processing direction. A tube expansion station includes a tube expansion device, which comprises a tube expansion positioning component, a tube pressing component, and a tube expansion buffer component. The tube expansion positioning component has a guide portion extending into the workpiece to position the first end of the workpiece and a tube expansion mold for expanding the tube opening. The tube pressing component is disposed above the tube expansion positioning component and can press the workpiece downward to move the workpiece relative to the tube expansion mold to achieve downward tube expansion. The tube expansion buffer component is connected to the top of the tube expansion positioning component and is used to buffer the downward movement of the workpiece when it is subjected to external force, and to drive the workpiece to reset when the external force disappears. A polishing station includes a polishing device, which includes a polishing assembly and an adjustment assembly. The polishing assembly has a polishing wheel for polishing the inner shaft of the workpiece. The adjustment assembly is located on one side of the polishing assembly and can fit the workpiece in the material transfer assembly onto the outside of the polishing wheel and drive the workpiece to move up and down relative to the polishing wheel.

[0008] Preferably, the tube expansion and positioning assembly includes a base, a tube expansion mold, and a guide; the tube expansion mold is connected to the top center of the base, and one end of the tube expansion mold extends upward above the unloading assembly; the guide is connected to the top of the tube expansion mold and is used to fit inside the workpiece.

[0009] Preferably, the expansion and buffer assembly includes a discharge assembly, a nitrogen spring, and guide posts; multiple guide posts and multiple nitrogen springs are connected between the periphery of the discharge assembly and the base; each guide post includes a guide post body, a guide post inner sleeve, a guide post outer sleeve, and a spring; the spring is connected to the outside of the guide post body, one end of the spring abuts against the bottom of the guide post inner sleeve, and the other end is connected to the guide post body; the guide post inner sleeve is slidably connected to the guide post body, the guide post outer sleeve is connected to the outside of the guide post inner sleeve, and the guide post outer sleeve is connected inside the discharge assembly.

[0010] Preferably, the unloading assembly includes an unloading platform and an unloader connected to the inner side of the unloading platform; the center of the unloader is connected to an expansion mold, and the expansion mold extends beyond the top of the unloader by a preset height; the bottom of the unloader is connected to the base above by a nitrogen spring; multiple through holes are opened on the periphery of the unloading platform, and the guide post sleeve is connected to the corresponding through hole.

[0011] Preferably, the tube expanding mold has a positioning part connected to the base and a tube expanding part for processing the workpiece tube expanding; the positioning part is connected to the lower part of the tube expanding part to form a U-shaped structure with an opening groove facing the tube pressing assembly side; the positioning part is connected to the base by bolts; the circumference of the tube expanding part has an inwardly inclined guide slope, so that the first end of the workpiece is fitted into the guide part and can partially extend to the outside of the guide slope, and the bottom part of the first end of the workpiece abuts against the top of the unloader.

[0012] Preferably, the pressing assembly includes a positioning seat, a driving device, a pressure plate, and a pressure rod assembly; the positioning seat is connected to the frame, the driving device is connected above the positioning seat, and the driving end of the driving device extends into the interior of the positioning seat; the pressure plate is connected to the bottom of the driving end; the pressure rod assembly includes a pressure rod and a pressure sleeve connected below the pressure rod, the pressure sleeve being able to press down on the second end face of the workpiece under the driving action of the driving device, so that the workpiece moves along the guide slope of the expanding part of the expanding mold, so that the first end of the workpiece forms a flared opening.

[0013] Preferably, the brushing assembly includes a driving mechanism and a polishing assembly; the polishing assembly includes a connecting disk, a rotating shaft, and a connecting shaft; the driving mechanism is connected to the frame, the top of the output shaft of the driving mechanism is connected to the connecting disk, the top of the connecting disk is connected to the rotating shaft, and the top of the rotating shaft is connected to the connecting shaft.

[0014] Preferably, a polishing brush is connected to the circumference of the rotating shaft to clean foreign objects generated during polishing on the workpiece; a polishing wheel is connected to the connecting shaft, and the connecting disc, rotating shaft and connecting shaft are driven to rotate by a driving mechanism so that the polishing wheel rotates relative to the inner circumference of the workpiece to polish the inner wall of the workpiece.

[0015] Preferably, the adjustment assembly includes a support, a drive member, a sliding assembly, and a gripper assembly; the top of the support is connected to the drive member, and the output shaft of the drive member extends into the support and is connected to the top of the sliding assembly; the sliding assembly has a fixed end that extends into the support and is connected to the drive member, and a sliding end that extends out of the support and is slidably connected to the support; the gripper assembly is connected to the sliding end, and the gripper assembly has grippers for holding the workpiece, and the gripper assembly can hold the workpiece and move it up and down relative to the polishing wheel under the action of the sliding assembly.

[0016] Preferably, the sliding assembly includes a connecting plate and a connecting bracket connected together; the connecting bracket forms a fixed end and is connected to the lower part of the output shaft of the drive component; the connecting plate forms the sliding end, the connecting plate has a sliding block on the side facing the support, and the side of the support has a slide rail, so that the connecting plate is vertically slidably connected to the support through the sliding block and the slide rail; the gripper assembly is connected to the side of the connecting plate opposite to the support.

[0017] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows: 1. This application discloses a CNC tube-expanding and polishing machine for an air conditioning liquid receiver. The tube-expanding positioning assembly has a guide portion extending into the workpiece to position the first end of the workpiece and a tube-expanding mold for expanding the tube opening. A tube-pressing assembly is positioned above the tube-expanding positioning assembly, capable of pressing the workpiece downwards to move it relative to the tube-expanding mold, thus achieving tube expansion by pressing down. This ensures that the workpiece moves while the tube-expanding mold remains stationary. The tube-expanding mold is fixed in the lower tube-expanding station and remains stationary. The workpiece is pushed downwards by a drive device, "actively" fitting into the stationary mold and completing the flaring process. The mold is stationary and can be installed and adjusted very precisely; its centerline remains unchanged once fixed. The tube-pressing assembly, which pushes the workpiece, typically has excellent guiding properties. Combined with the guide portion of the tube-expanding positioning assembly, it fits inside the workpiece, ensuring the workpiece moves vertically downwards. Therefore, it has extremely high centering and coaxiality, ensuring a perfectly symmetrical flared shape, uniform wall thickness, and significantly improved and stable product quality. Secondly, the workpiece processed by the tube expansion station of this application has good stability and is not easily damaged. Because the workpiece is "actively" addressing the mold, the force distribution is more optimized. The fixture only needs to prevent the workpiece from rotating, without having to resist the huge downward pressure. On the contrary, the downward pressing force of the tube pressing assembly will promote the workpiece to expand, and the tube expansion buffer assembly can better buffer this pressure, so that the workpiece expands evenly and smoothly during the downward movement. Therefore, there is no need to clamp the workpiece additionally; it is only necessary to put the workpiece on the outside of the guide.

[0018] 2. The guide component of this application can extend into the interior of the workpiece to provide vertical guidance for its movement. The first end of the workpiece can be repositioned by the unloader, preventing it from tilting. Therefore, compared to traditional methods that require additional clamping force, this application provides more stable clamping, and the workpiece is less prone to bending or displacement. With traditional clamping components, excessive clamping force can cause the workpiece to bend or deform, while insufficient clamping force can lead to unstable workpiece positioning, making it easy for the upper pressure tube assembly to press down, potentially causing the workpiece to tilt or even become unusable. This application avoids the use of additional clamping force, preventing secondary damage to the workpiece's periphery and preventing damage or scratches during the stamping process. Therefore, this application is particularly suitable for processing long tubes and thin-walled parts with large length-to-diameter ratios, resulting in a higher yield. Secondly, because the workpiece is inverted and facing downwards, it facilitates chip removal and lubrication. The workpiece's gravity assists in its vertical downward movement, and metal chips and excess lubricant naturally fall downwards due to gravity, preventing them from being trapped within the forming area. Therefore, it greatly improves the surface quality of the workpiece after forming and reduces the cleaning process.

[0019] 3. The stationary mold in this application does not obstruct the view, allowing the operator to clearly see the entire process from workpiece contact with the mold to final forming. This provides excellent process visibility, facilitating real-time quality monitoring, fault diagnosis, and process debugging. Furthermore, by reducing the downward pressing action of the mold, this application minimizes the movement of the tube expanding mold, primarily relying on the workpiece for movement. This significantly shortens the workpiece's and the expanding mold's movement distance, requiring only the workpiece to move on the guide ramp. Consequently, the precision dependence and number of pressing operations of the tube compression assembly are reduced. Compared to the massive downward pressing action of the upper moving mold, this results in better system rigidity, higher long-term operational stability, and potentially extended mold life due to improved alignment, thus enhancing safety. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a CNC tube expanding and polishing machine for an air conditioning liquid receiver according to one embodiment of this application; Figure 2 This is a schematic diagram of the material transfer component of a CNC tube expansion and polishing machine for an air conditioning liquid receiver, according to one embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the expansion station of a CNC tube expansion and polishing machine for an air conditioning liquid receiver, according to one embodiment of this application.

[0022] Figure 4 yes Figure 3 Schematic diagram of the cross section of AA; Figure 5 yes Figure 4 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the pressing assembly structure of a CNC tube expanding and polishing machine for an air conditioning liquid receiver according to one embodiment of this application; Figure 7 This is a schematic diagram of the brushing assembly of a CNC tube expander brushing machine for an air conditioning liquid receiver according to one embodiment of this application; Figure 8 This is a schematic diagram of the adjustment assembly of a CNC tube expander and polishing machine for an air conditioning liquid receiver according to one embodiment of this application; In the picture, 1. Rack; 2. Pipe expansion positioning assembly; 21. Base; 22. Pipe expansion mold; 23. Guide component; 3. Pressure tube assembly; 31. Positioning seat; 32. Drive device; 33. Pressure plate; 34. Pressure rod assembly; 341. Pressure rod; 342. Pressure head; 4. Pipe expansion buffer assembly; 41. Unloading assembly; 411. Unloading platform; 412. Unloader; 42. Nitrogen spring; 43. Guide post; 431. Guide post body; 432. Guide post inner sleeve; 433. Guide post outer sleeve; 434. Spring; 5. Polishing device; 51. Polishing assembly; 511. Drive mechanism; 512. Polishing assembly; 5121. Connecting plate; 5122. Rotating shaft; 5123. Connecting shaft; 6. Adjustment component; 61. Support; 62. Drive component; 63. Sliding component; 631. Connecting plate; 632. Connecting bracket; 64. Gripper assembly; 7. Material transfer assembly; 71. Base; 72. First drive structure; 73. Second drive structure; 74. Transfer assembly; 741. Horizontal support; 742. First gripper assembly; 743. Second gripper assembly; 744. Third gripper assembly; 8. Guide slope; 9. Boss; 10. Positioning part; 11. Pipe expansion part; 12. First end; 13. Second end; 14. Loading position; 15. Pipe expansion station; 16. Polishing station; 17. Workpiece; 18. Rotary cylinder. Detailed Implementation

[0023] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0025] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0028] This application relates to a CNC tube-expanding and polishing machine for air conditioning liquid receivers, such as... Figure 1-8 As shown, it includes: The frame 1 has a material transfer assembly 7 for conveying workpiece 17 connected to its first side, and a pipe expansion station 15 and a polishing station 16 connected to its second side along the processing direction of workpiece 17. The tube expansion station 15 includes a tube expansion device, which includes a tube expansion positioning component 2, a tube pressing component 3, and a tube expansion buffer component 4. The tube expansion positioning component 2 has a guide portion extending into the interior of the workpiece 17 to position the first end 12 of the workpiece 17 and a tube expansion mold 22 for expanding the tube opening. The tube pressing component 3 is disposed above the tube expansion positioning component 2 and can press the workpiece 17 downward to move the workpiece 17 relative to the tube expansion mold 22 to achieve tube expansion by pressing down. The tube expansion buffer component 4 is connected to the top of the tube expansion positioning component 2 and is used to buffer the downward movement of the workpiece 17 when it is subjected to external force, and to drive the workpiece 17 to reset when the external force disappears. The polishing station 16 includes a polishing device 5, which includes a polishing assembly 51 and an adjustment assembly 6. The polishing assembly 51 has a polishing wheel for polishing the inner shaft of the workpiece 17. The adjustment assembly 6 is located on one side of the polishing assembly 51 and can fit the workpiece 17 in the material transfer assembly 7 onto the outside of the polishing wheel and drive the workpiece 17 to move up and down relative to the polishing wheel.

[0029] The expansion positioning component 2 of the expansion station 15 of this application can achieve preliminary positioning of the workpiece 17, so that the workpiece 17 can be accurately positioned before expansion. Since the expansion positioning component 2 has a guide part extending into the interior of the workpiece 17, it can achieve vertical guidance and positioning of the workpiece 17, so that the workpiece 17 is always in a straight state during movement and non-movement, avoiding the workpiece 17 from deviating in the axial or radial direction, thereby further ensuring the expansion accuracy and product quality. The pressing component 3 of this application can press down on the workpiece 17 in the expansion positioning component 2, so that the workpiece 17 moves downward. When the workpiece 17 contacts the expansion mold 22 and the pressing component 3 continues to press down on the workpiece 17, the workpiece 17 moves along the expansion mold 22, so that the first end 12 of the workpiece 17 is squeezed and plastically deformed to form an outwardly expanding flared state. In existing technologies, workpiece 17 is fixed in the lower fixture and remains stationary, while the upper flaring die moves downward under the drive of the press, squeezing the end of workpiece 17 and causing it to undergo plastic deformation to form the desired shape. Therefore, this structure is prone to several problems. First, poor alignment and coaxiality. The cumulative errors of the entire system, such as the press slide guide clearance, die installation errors, and fixture positioning errors, directly affect the alignment between the die and workpiece 17. Since the die is moving, its trajectory is difficult to guarantee ideal coaxiality with workpiece 17. This easily leads to asymmetrical flaring and uneven wall thickness, i.e., one side is thinner than the other, severely affecting product quality and sealing performance. Second, workpiece 17 is prone to deformation or displacement: the enormous downward pressure of the die is entirely borne by workpiece 17 and the fixture. Workpiece 17 itself is not very rigid; the wall of the reservoir is relatively thin, and if the clamping force is insufficient, workpiece 17 may be crushed, bent, or slide within the fixture. This can cause workpiece 17 to be scrapped or even damage the die. Secondly, problems arise with chip removal and lubrication. Metal chips or lubricant generated during the extrusion process can become trapped in the workpiece 17 and the mold cavity by the downward-moving die, making them difficult to remove. These chips may be pressed into the surface of the workpiece 17, causing surface scratches, pits, and other defects, affecting smoothness and corrosion resistance. Furthermore, observation and monitoring are difficult; the moving die may obstruct the operator's view, making it difficult to observe the initial stage and the entire process of flaring in real time. This hinders online quality monitoring and timely adjustments after problems are identified. Finally, there is a high dependence on equipment; traditional tube expansion methods rely entirely on the precision and rigidity of the press slide. Equipment wear directly impacts product quality.

[0030] Furthermore, traditional molds require different size designs, necessitating the use of a conical structure (diameter size) in the expansion mold 22 that matches the flaring shape of the workpiece 17. This demands extremely high taper accuracy, as the cone's tip needs to be pressed downwards into the workpiece 17 to expand the tube at its end. This requires precise measurements of both the height and radial diameter of the cone's outer surface. The actual stamping section is the portion of the cone with a diameter larger than the end of the workpiece 17. Since the cone's circumference doesn't immediately contact the end of the workpiece 17 when the tip enters, and given that the workpiece 17 is a thin liquid reservoir, this sudden contact with the cone's side can easily create downward pressure, causing the thin-walled tube opening to buckle rather than expand uniformly. The opening becomes crushed, wrinkled, or twisted, instead of forming a smooth flare. Furthermore, while the conical tip entering the pipe provides some guidance and alignment, it cannot fully compensate for the combined errors of the equipment, fixtures, and mold itself. Even a slight deviation between the mold's centerline and the workpiece's centerline will amplify the problem, leading to asymmetrical flaring—one side flaring larger than the other, resulting in uneven wall thickness and severely impacting the product's sealing and connection strength.

[0031] In this application, the workpiece 17 moves while the tube-expanding mold 22 remains stationary, fixed on the lower tube-expanding station 15. The workpiece 17 is pushed downwards by the drive device 32, "actively" fitting onto the stationary mold and completing the flaring process. The mold is stationary and can be installed and adjusted with great precision; its centerline remains unchanged once fixed. The pressing assembly 3, which pushes the workpiece 17, typically has excellent guiding properties, ensuring the workpiece 17 moves vertically downwards. Therefore, it has extremely high alignment and coaxiality, ensuring perfectly symmetrical flared shape, uniform wall thickness, and significantly improved and stable product quality. Furthermore, the workpiece 17 processed by the tube-expanding station 15 in this application exhibits good stability and is less prone to damage because the workpiece 17 "actively" addresses the mold, resulting in a superior force distribution. The clamp only needs to prevent the workpiece 17 from rotating, without resisting the huge downward pressure. On the contrary, the downward pressing force of the tube pressing assembly 3 will promote the expansion of the workpiece 17, and the tube expansion buffer assembly 4 can better buffer this pressure, so that the workpiece 17 expands evenly and smoothly during the downward movement. Therefore, there is no need to clamp the workpiece 17. It is only necessary to put the workpiece 17 on the outside of the guide member 23. The guide member 23 can also extend into the interior of the workpiece 17 to play a vertical guiding role for the movement of the workpiece 17. The first end 12 of the workpiece 17 can be repositioned under the action of the unloader 412 to prevent the workpiece 17 from deflecting. Therefore, compared with the traditional clamping force that needs to be applied, the clamping of this application is more stable, and the workpiece 17 is not easy to bend or shift. In traditional clamping processes, excessive clamping force can cause workpiece 17 to bend or deform, while insufficient clamping force can lead to unstable positioning of workpiece 17, making it prone to skewing when pressed down by the upper pressure tube assembly 3, and even resulting in scrap. This application avoids the use of additional clamping force, preventing secondary damage to the periphery of workpiece 17 and preventing damage or scratches to workpiece 17 during the entire stamping process. Therefore, this application is particularly suitable for processing long tubes and thin-walled parts with large length-to-diameter ratios compared to traditional processing structures, resulting in a higher yield. Secondly, because workpiece 17 is inverted and facing downwards, it facilitates chip removal and lubrication. The gravity of workpiece 17 assists in its vertical downward movement, and metal chips and excess lubricant naturally fall downwards due to gravity, preventing them from being trapped in the forming area. Therefore, it greatly improves the surface quality of workpiece 17 after forming and reduces cleaning processes. In addition, the stationary mold of this application does not obstruct the view, and the operator can clearly see the entire process of the workpiece 17 from contact with the mold to final forming, which makes the process visible and facilitates real-time quality monitoring, fault diagnosis and process debugging.Furthermore, by reducing the downward pressing of the mold, this application reduces the movement of the expansion mold 22, which is mainly driven by the workpiece 17. The movement distance of the workpiece 17 is greatly shortened, and the movement distance of the expansion mold 22 is also greatly shortened, requiring only the workpiece 17 to move on the guide slope 8. Therefore, the precision dependence and number of pressing cycles of the compression tube assembly 3 in this application are reduced. Compared with the downward pressing of the huge moving mold above, the system has better rigidity, higher long-term operational stability, and the mold life may also be extended due to better alignment, thus improving safety.

[0032] like Figure 1 The diagram shown is an overall structural schematic of a CNC tube expansion and polishing machine for an air conditioning liquid receiver according to this application. The machine frame 1 is connected to a material distribution and transfer assembly 7 on one side. The material distribution and transfer assembly 7 can clamp the workpiece 17 located at the loading position 14 and send it sequentially to the tube expansion position 15 and the polishing position 16 before conveying it to the next device for pressing the partition and filter.

[0033] like Figure 2The diagram shows the structure of the material distribution and transfer assembly 7. The material distribution and transfer assembly 7 includes a base 71, a first drive structure 72, a second drive structure 73, and a transfer assembly 74. A sliding block is connected to the bottom of the base 71, and two parallel tracks are provided on the top of the frame 1. The sliding block at the bottom of the base 71 can be slidably connected to the tracks. The first drive structure 72 is connected to the top of the base 71. The first motor shaft of the first drive structure 72 extends downward beyond the bottom of the base 71. A gear is connected to the first motor shaft, and a rack meshing with the gear is connected to the inner side of the tracks. Through gear and rack meshing, when the first drive structure 72 is driven, the gear rotates and moves along the rack, thereby moving the base 71 along the tracks. The second drive structure 73 is connected to the top of the base 71. The second motor shaft of the second drive structure 73 extends downward and can be connected to the transfer assembly 74, thereby driving the transfer assembly 74 to move along the height direction of the base 71. The transfer assembly 74 includes a transverse support 741 and multiple gripper assemblies 64 connected to one side of the transverse support 741. Each gripper assembly 64 includes a gripper base, a gripper cylinder, and a gripper connecting assembly. The gripper base is connected to the side of the transverse support 741 facing each workstation. The gripper base houses a first gripper, a second gripper, a gripper cylinder, and the gripper connecting assembly. The gripper connecting assembly includes a connecting rack, a first connecting gear, and a second connecting gear. The drive shaft of the gripper cylinder is connected to one end of the connecting rack along its length. The connecting rack can reciprocate horizontally under the drive of the drive shaft of the gripper cylinder. The first connecting gear is connected to the first shaft of the first gripper, and the second connecting gear is connected to the second shaft of the second gripper. Thus, when the gripper cylinder drives the connecting rack to move, it can drive the first and second connecting gears to rotate, further driving the first and second shafts to rotate, thereby adjusting the distance between the first and second grippers to accommodate workpieces 17 of different sizes.

[0034] Specifically, Figure 2 The multiple gripper assemblies 64 from right to left are labeled as first gripper assembly 742, second gripper assembly 743, and third gripper assembly 744; wherein the first gripper assembly 742 is used for gripping from... Figure 1 The loading station 14 on the rightmost frame 1 clamps the workpiece 17 and then moves it horizontally or vertically to place the workpiece 17 into the tube expansion station 15 of the frame 1. After the workpiece 17 completes the tube expansion process, it is moved to the tube expansion station 15 by the second gripper assembly 743 to clamp the workpiece 17 and then moved to the polishing station 16 to complete the polishing process of the inner wall of the workpiece 17. After the polishing process is completed, it is moved to the polishing station 16 by the third gripper assembly 744 to clamp the workpiece 17 and then moved to the next device.

[0035] In addition, it should be noted that the third gripper assembly 744 is also connected to a rotary cylinder 18. The function of the rotary cylinder 18 is that, after the workpiece 17 has been polished, during the process of moving the workpiece 17 from the polishing station 16 to the next partition pressing station through the third gripper assembly 744, the first end 12 of the workpiece 17 needs to be set upward by the rotary cylinder 18. That is, the original setting of the first end 12 of the workpiece 17 facing downward is rotated 180° by the action of the rotary cylinder 18, so that the first end 12 is set upward, which is conducive to the installation of partitions or filters and other structures from the flared position of the first section inward.

[0036] In a preferred embodiment, the tube expansion positioning assembly 2 includes a base 21, a tube expansion mold 22, and a guide 23; the tube expansion mold 22 is connected to the top center of the base 21, and one end of the tube expansion mold 22 extends upward above the unloading assembly 41; the guide 23 is connected to the top of the tube expansion mold 22 and is used to fit inside the workpiece 17.

[0037] like Figure 3 The diagram shows the structure of the tube expansion station 15. The tube expansion station 15 includes a tube expansion positioning component 2, a tube expansion buffer component 4, and a tube pressing component 3. The tube expansion positioning component 2 is used to position and guide the workpiece 17, so that the workpiece 17 is fitted into the tube expansion positioning component 2, and can move straight down in a straight line along the guiding action of the tube expansion positioning component 2 when the workpiece 17 is pressed down by the tube pressing component 3, preventing the workpiece 17 from deflecting during the pressing process of the tube pressing component 3, which would lead to tube expansion failure. Specifically, the tube expansion positioning assembly 2 includes a base 21, which has a column-like structure. The base 21 has outwardly protruding bosses 9 on its periphery. The tube expansion mold 22 is bolted to the top center of the base 21. A guide member 23 is bolted to the top of the tube expansion mold 22. The guide member 23 can form a clearance fit with the workpiece 17, so that the workpiece 17 is sleeved on the top of the guide member 23, allowing the workpiece 17 to move downward along the guide member 23. Since the guide member 23 extends into the interior of the workpiece 17, it can guide the downward or upward movement of the workpiece 17, so that the workpiece 17 can move smoothly and straight downward or upward under the cooperation of the guide member 23 and the tube expansion buffer assembly 4, preventing skewness and further improving the product quality and precision of the tube expansion.

[0038] In use, the first gripper assembly 742 grips the workpiece 17 from the loading position 14 to the outside of the guide member 23 of the tube expansion positioning assembly 2 at the tube expansion station 15, so that the workpiece 17 is sleeved on the outside of the guide member 23. At this time, the first end 12 of the workpiece 17 is set downward, and the first end 12 can abut against the guide slope 8 of the tube expansion section 11 described below, near the middle position along the height direction of the guide slope 8. It should be noted that at this time, the first end 12 of the workpiece 17 is stuck in the middle area of ​​the guide slope 8 and does not completely cover the guide slope 8. The purpose is that when the tube pressing assembly 3 presses down on the second end 13 of the workpiece 17, the first end 12 of the workpiece 17 can continue to move downward along the guide slope 8 of the tube expansion section 11, so that under the action of the guide slope 8, the port of the second end 13 of the workpiece 17 is opened to form an outwardly expanding flared state.

[0039] Preferably, the expansion and buffer assembly 4 includes a discharge assembly 41, a nitrogen spring 42, and a guide post 43; a plurality of guide posts 43 and a plurality of nitrogen springs 42 are connected between the periphery of the discharge assembly 41 and the base 21; the guide post 43 includes a guide post body 431, a guide post inner sleeve 432, a guide post outer sleeve 433, and a spring 434; the spring 434 is connected to the outside of the guide post body 431, one end of the spring 434 abuts against the bottom of the guide post inner sleeve 432, and the other end is connected to the guide post body 431; the guide post inner sleeve 432 is slidably connected to the guide post body 431, the guide post outer sleeve 433 is connected to the outside of the guide post inner sleeve 432, and the guide post outer sleeve 433 is connected inside the discharge assembly 41.

[0040] like Figure 3 As shown, the expansion buffer assembly 4 is used to generate a relatively upward elastic abutment force during the downward movement of the workpiece 17, so that the force applied by the pressing assembly 3 and the upward buffering force of the buffer assembly work together to achieve a uniform and stable downward movement of the workpiece 17, thereby ensuring that the periphery of the first end 12 of the workpiece 17 can form a uniform expansion edge.

[0041] Specifically, the expansion tube buffer assembly 4 includes a discharge assembly 41, a nitrogen spring 42, and a guide post 43; wherein the discharge assembly 41 includes a discharge platform 411 and a discharger 412 connected to the inner side of the discharge platform 411; as Figure 4As shown in the cross-sectional schematic diagram of the expansion buffer assembly 4, the unloading platform 411 has an L-shaped first stepped surface, and the unloader 412 has a second stepped surface that mates with the L-shaped stepped surface. The second stepped surface abuts against the first stepped surface, and bolts pass through the first and second stepped surfaces to connect the unloader 412 and the unloading platform 411 to form an integrated structure. The center of the unloader 412 is connected to the expansion mold 22, and the bottom of the expansion mold 22 extends toward the base 21 and can be bolted to the base 21. The top of the expansion mold 22 can extend upward beyond the top of the unloader 412 by a predetermined height, so that the guide slope 8 of the expansion part 11 on the expansion mold 22 can partially extend into the first end 12 of the workpiece 17. Multiple nitrogen springs 42 have one end connected to the boss 9 of the base 21, and the other end connected to the bottom of the unloading platform 411. The nitrogen springs 42 act as a buffer, allowing the unloading platform 411 to move smoothly up and down and helping it return to its original position. Multiple through holes penetrating the height of the unloading platform 411 are also provided along the circumference of the unloading platform 411 for connection to guide posts 43. Specifically, the guide post 43 includes a guide post body 431, a guide post inner sleeve 432, a guide post outer sleeve 433, and a spring 434. The bottom of the guide post body 431 is connected to the boss 9 of the base 21 by fastening bolts, and the top of the guide post body 431 extends upward to connect to the through hole of the unloading platform 411. A guide post is also sleeved and connected to the outer side of the end of the guide post body 431 extending into the through hole. The inner sleeve 432 is connected to the outer side of the guide post inner sleeve 432, and the guide post outer sleeve 433 can be inserted into the through hole, and the guide post outer sleeve 433 is connected to the through hole. The guide post inner sleeve 432 and the guide post body 431 can slide relative to each other. The spring 434 is sleeved on the outer side of the guide post body 431. One end of the spring 434 abuts against the bottom of the guide post inner sleeve 432, and the other end abuts against the top surface of the positioning platform that protrudes to the periphery at the bottom of the guide post body 431.

[0042] In use, when the first end 12 of workpiece 17 is upside down on the outside of guide member 23, the first end 12 of workpiece 17 can abut downwards against the guide slope 8 of tube expansion mold 22 and engage with the guide slope 8; when the pressing tube assembly 3 is activated to press the second end 13 of workpiece 17 downwards, workpiece 17 can move downwards, thereby allowing the first end 12 of workpiece 17 to move downwards along the guide slope 8 of tube expansion section 11 as described below. Since the initial state of the first end 12 of workpiece 17 is against the guide slope 8 of tube expansion section 11, there is a moving gap between the first end 12 of workpiece 17 and the top surface of unloader 412. When the first end 12 of workpiece 17 moves downwards and contacts the top surface of unloader 412, the pressing tube assembly 3 continues to press the workpiece 17 downwards. The second end 13 of 7 causes the first end 12 of workpiece 17 to drive the unloader 412 and the entire unloading platform to move downward. At this time, since the guide column outer sleeve 433 is connected to the unloading platform and the guide column inner sleeve 432 is connected to the guide column outer sleeve 433, and the guide column inner sleeve 432 can slide relative to the guide column body 431, thereby driving the unloading platform, the guide column outer sleeve 433 and the guide column inner sleeve 432 to move downward to compress the spring 434. Under the elastic force of the spring 434 and the action of the nitrogen spring 42, the entire unloading platform, the guide column outer sleeve 433 and the guide column inner sleeve 432 can be kept moving smoothly as a whole, so that the second end 13 of workpiece 17 can move downward along the guide slope 8, and realize that the second end 13 of workpiece 17 forms an outwardly expanding flared state. After the expansion process is completed, the pressing assembly 3 disengages from the second end 13 of the pressing workpiece 17. The nitrogen spring 42 plays a major role, releasing the elastic force to reset the inner sleeve 432 of the guide post, thereby driving the outer sleeve 433 of the guide post and the unloading table 411 to reset.

[0043] Preferably, the tube expansion mold 22 has a positioning part 10 connected to the base 21 and a tube expansion part 11 for expanding the workpiece 17; the positioning part 10 is connected to the lower part of the tube expansion part 11 to form a U-shaped structure with an opening groove facing the tube pressing assembly 3; the positioning part 10 is connected to the base 21 by bolts; the circumference of the tube expansion part 11 has an inwardly inclined guide slope 8, so that the first end 12 of the workpiece 17 is fitted into the guide part and can partially extend to the outside of the guide slope 8, and the bottom part of the first end 12 of the workpiece 17 abuts against the top of the unloader 412.

[0044] The pipe expanding mold 22 has a cylindrical structure, and the center of the pipe expanding mold 22 has a cylindrical cavity; thus, the cross-section of the pipe expanding mold 22 has a U-shaped structure. For example... Figure 4As shown, the tube expansion mold 22 includes a positioning part 10 at the bottom and a tube expansion part 11 connected to the top of the bottom. The positioning part 10 at the bottom is fixedly connected to the center of the top surface of the base 21 by a through bolt; the positioning part 10 can be detached from the base 21 by means of a detachable method, so that it can be easily replaced and repaired when the tube expansion mold 22 is worn; and tube expansion molds 22 of different sizes can also be installed. The circumference of the expanding tube section 11 has an inclined guide slope 8. The radial dimension of the guide slope 8 increases from top to bottom, so that the guide slope 8 forms a conical structure with the bottom inclined outward and the top inclined inward. When the first end 12 of the workpiece 17 is sleeved on the outside of the guide member 23, the first end 12 of the workpiece 17 can be locked on the outside of the guide slope 8, and the bottom of the first end 12 of the workpiece 17 has a moving gap from the top surface of the unloader 412. When the pressing tube assembly 3 presses the workpiece 17 down, the second end 13 of the workpiece 17 moves along the guide slope 8, so that the second end 13 of the workpiece 17 can form an outwardly expanding flared state under the expansion action of the guide slope 8.

[0045] Preferably, the pressing assembly 3 includes a positioning seat 31, a driving device 32, a pressure plate 33, and a pressing rod assembly 34; the positioning seat 31 is connected to the frame 1, the driving device 32 is connected above the positioning seat 31, and the driving end of the driving device 32 extends into the interior of the positioning seat 31; the pressure plate 33 is connected to the bottom of the driving end; the pressing rod assembly 34 includes a pressing rod 341 and a pressing sleeve connected below the pressing rod 341, the pressing sleeve can press down on the end face of the second end 13 of the workpiece 17 under the driving action of the driving device 32, so that the workpiece 17 moves along the guide slope 8 of the expanding part 11 of the expanding mold 22, so that the first end 12 of the workpiece 17 forms a flared opening.

[0046] like Figure 6As shown, the positioning seat 31 of the pipe pressing assembly 3 is connected to the frame 1 and corresponds to the upper part of the pipe expanding station 15, thereby facilitating the downward pressing of the pressing rod assembly 34 of the pipe pressing assembly 3 towards the second end 13 of the workpiece 17, causing the workpiece 17 to move downward. Specifically, the positioning seat 31 is provided with a pressing plate 33 and a pressing rod assembly 34. The driving device 32 is connected to the top of the positioning seat 31, and the driving end of the driving device 32 can extend into the positioning seat 31 and connect with the pressing plate 33. Preferably, the driving device 32 adopts a 130 motor and a motor cylinder. Preferably, a positioning block can be connected to the periphery of the pressing plate 33. A sliding rail is connected at the position corresponding to the positioning block. The positioning block is slidably connected to the sliding rail, so that the pressure plate 33 can move along the sliding rail. The pressure rod assembly 34 includes a pressure rod 341 and a pressure sleeve at the bottom of the pressure rod 341. The periphery of the pressure sleeve can be wrapped with rubber material to prevent damage to the end of the workpiece 17. The pressure rod 341 and the pressure rod assembly 34 are driven to move vertically by the driving end of the driving device 32. When the pressure sleeve moves downward, it can press down on the workpiece 17. When it is not necessary to press down on the workpiece 17, the pressure sleeve moves upward and disengages from the second end 13 of the workpiece 17 by the retraction movement of the driving device 32.

[0047] Preferably, the polishing assembly 51 includes a drive mechanism 511 and a polishing assembly 512; the polishing assembly 512 includes a connecting disk 5121, a rotating shaft 5122 and a connecting shaft 5123; the drive mechanism 511 is connected to the frame 1, the top of the output shaft of the drive mechanism 511 is connected to the connecting disk 5121, the top of the connecting disk 5121 is connected to the rotating shaft 5122, and the top of the rotating shaft 5122 is connected to the connecting shaft 5123.

[0048] like Figure 7 As shown, the drive mechanism 511 of the polishing assembly 51 preferably uses a three-phase asynchronous motor. The output shaft of the drive mechanism 511 is connected to a connecting disk 5121. The diameter of the connecting disk 5121 is larger than that of the rotating shaft 5122 and the connecting shaft 5123 above it. The purpose is to allow foreign objects after the workpiece 17 is polished by the polishing wheel to fall onto the connecting disk 5121 below. Preferably, the periphery of the connecting disk 5121 is also connected to a retaining edge that protrudes from the connecting disk 5121 along the height direction, which can block foreign objects and prevent them from falling. The top surface of the connecting disk 5121 is connected to the rotating shaft 5122. The periphery of the rotating shaft 5122 is connected to a polishing brush for cleaning foreign objects generated during polishing on the workpiece 17. The connecting shaft 5123 is connected to a polishing wheel. The drive mechanism 511 drives the connecting disk 5121, the rotating shaft 5122, and the connecting shaft 5123 to rotate, so that the polishing wheel rotates relative to the inner periphery of the workpiece 17 to polish the inner wall of the workpiece 17.

[0049] In use, the second gripper assembly 743 can move toward the tube expansion station 15, so that the grippers of the second gripper assembly 743 can grip the workpiece 17 on the tube expansion station 15 and transfer the workpiece 17 to the outside of the polishing wheel of the brushing station 16, so that the polishing wheel is sleeved on the inside of the workpiece 17. Under the action of the drive mechanism 511, the polishing wheel can rotate to polish the inner wall of the workpiece 17, so that the inner axis of the workpiece 17 is smooth and burr-free. Under the clamping action of the adjustment assembly 6 described below, the workpiece 17 can be driven to move up and down along the axial direction of the polishing wheel, thereby facilitating the polishing wheel to polish the inner wall of the workpiece 17 smoothly, so that the inner wall of the workpiece 17 in the axial direction is polished evenly. And because the workpiece 17 can move downward under the action of the adjustment assembly 6, the brush on the connecting shaft 5123 below the polishing wheel can further wipe the inner wall of the workpiece 17, completely removing foreign objects from the inside of the workpiece 17. The foreign objects fall down from the inside of the workpiece 17 onto the connecting plate 5121.

[0050] Preferably, the adjustment assembly 6 includes a support 61, a drive member 62, a sliding assembly 63, and a gripper assembly 64; the top of the support 61 is connected to the drive member 62, and the output shaft of the drive member 62 extends into the support 61 and is connected to the top of the sliding assembly 63; the sliding assembly 63 has a fixed end that extends into the support 61 and is connected to the drive member 62, and a sliding end that extends out of the support 61 and is slidably connected to the support 61; the gripper assembly is connected to the sliding end, and the gripper assembly has grippers for gripping the workpiece 17, and the gripper assembly can grip the workpiece 17 and move it up and down relative to the polishing wheel under the action of the sliding assembly 63.

[0051] like Figure 8 The diagram shows the structure of the adjustment component 6. The support 61 of the adjustment component 6 and the polishing component 51 are positioned opposite each other along the width of the frame 1, facilitating the linear movement of the adjustment component 6 towards the polishing component 51. The workpiece 17 is placed in the polishing wheel of the polishing component 51, and under the driving action of the adjustment component 6, the workpiece 17 moves up and down relative to the polishing wheel, achieving polishing of the inner wall of the workpiece 17. The driving component 62 is connected to the top of the support 61, and the output shaft below the driving component 62 can extend into the interior of the support 61 and connect to the sliding component 63 below, as shown... Figure 8 As shown, the front side of the support 61 has a vertically distributed slide rail, and the sliding component 63 can move along the slide rail. Since the sliding component 63 is connected to a clamping component, the clamping claw of the clamping component can clamp the workpiece 17, thereby driving the workpiece 17 to move up and down relative to the polishing wheel.

[0052] Preferably, such as Figure 8As shown, the sliding assembly 63 includes a connecting plate 631 and a connecting bracket 632 connected together; the connecting bracket 632 forms a fixed end and is connected to the lower part of the output shaft of the drive member 62; the connecting plate 631 forms a sliding end, and the side of the connecting plate 631 facing the support 61 has a sliding block, and the side of the support 61 has a slide rail, so that the connecting plate 631 is vertically slidably connected to the support 61 through the sliding block and the slide rail; the clamping assembly is connected to the side of the connecting plate 631 opposite to the support 61.

[0053] When the output axis of the drive component 62 extends downward, it can drive the connecting bracket 632 to move downward, thereby driving the connecting plate 631 to move downward. One side of the connecting plate 631 is slidably connected to the slide rail through a sliding block, thereby supporting the connecting plate 631 and enabling the connecting plate 631 to move vertically downward evenly and smoothly along a predetermined route. The clamping cylinder of the clamping component drives the two clamping claws to rotate, adjusting the distance between the two clamping claws to clamp the workpiece 17 held by the claws of the second clamping claw component 743 on the material transfer component 7. The workpiece 17 is sleeved on the outside of the polishing wheel and moves up and down along the axis of the polishing wheel for thorough polishing.

[0054] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0055] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0056] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A CNC tube-expanding and polishing machine for air conditioning liquid receivers, characterized in that, include: The frame has a material transfer assembly for conveying workpieces connected to its first side, and a pipe expansion station and a polishing station connected to its second side along the workpiece processing direction. A tube expansion station includes a tube expansion device, which comprises a tube expansion positioning assembly, a tube pressing assembly, and a tube expansion buffer assembly. The tube expansion positioning assembly has a guide extending into the workpiece to position the first end of the workpiece and a tube expansion mold for expanding the tube opening. The tube expansion mold has a positioning part connected to a base and a tube expansion part for expanding the workpiece. The circumference of the tube expansion part has an inwardly inclined guide slope, allowing the first end of the workpiece to fit onto the guide part and partially extend to the outside of the guide slope. The tube pressing assembly is positioned above the tube expansion positioning assembly and can press the workpiece downwards, causing it to move relative to the tube expansion mold to achieve downward tube expansion. The tube expansion buffer assembly is connected to the top of the tube expansion positioning assembly and is used to buffer the workpiece when subjected to pressure. The expansion and buffer assembly is designed to buffer downward movement under external force and drive the workpiece to reset when the external force disappears. The expansion and buffer assembly includes an unloading assembly, a nitrogen spring, and a guide post. The guide post includes a guide post body, a spring, and a guide post inner sleeve. The nitrogen spring is connected to the bottom of the unloading assembly, the guide post body is connected to the expansion and positioning assembly, the guide post inner sleeve is slidably connected to the guide post body, and the guide post inner sleeve is connected to the unloading assembly. The spring is connected to the outside of the guide post body and one end is connected to the bottom of the guide post inner sleeve. When the first end of the workpiece moves downward and contacts the unloading assembly, the pressure tube assembly continues to press the second end of the workpiece downward, causing the first end of the workpiece to drive the unloading assembly to move downward. After the expansion of the second end of the workpiece is completed, the pressure tube assembly disengages from the second end of the workpiece, and the unloading assembly resets under the action of the nitrogen spring. A polishing station includes a polishing device, which includes a polishing assembly and an adjustment assembly. The polishing assembly has a polishing wheel for polishing the inner shaft of the workpiece. The adjustment assembly is located on one side of the polishing assembly and can fit the workpiece in the material transfer assembly onto the outside of the polishing wheel and drive the workpiece to move up and down relative to the polishing wheel.

2. The CNC tube expanding and polishing machine for an air conditioning liquid receiver as described in claim 1, characterized in that, The tube expansion positioning assembly includes a base, a tube expansion mold, and a guide component; The base has a tube expansion mold connected to its top center, with one end of the tube expansion mold extending upward above the unloading assembly; a guide is connected to the top of the tube expansion mold and is used to fit inside the workpiece.

3. The CNC tube expanding and polishing machine for an air conditioning liquid receiver as described in claim 2, characterized in that, The unloading assembly is connected to the base by multiple guide posts and multiple nitrogen springs. The guide post includes a guide post body, a guide post inner sleeve, a guide post outer sleeve, and a spring; the bottom of the guide post body is connected to the base; the guide post inner sleeve is slidably connected to the guide post body, the guide post outer sleeve is connected to the outside of the guide post inner sleeve, and the guide post outer sleeve is connected to the unloading assembly; the spring is connected to the outside of the guide post body, one end of the spring abuts against the bottom of the guide post inner sleeve, and the other end is connected to the guide post body.

4. The CNC tube expanding and polishing machine for an air conditioning liquid receiver as described in claim 3, characterized in that, The unloading assembly includes an unloading platform and an unloader connected to the inside of the unloading platform; the center of the unloader is connected to an expansion mold, and the expansion mold extends beyond the top of the unloader by a preset height; the bottom of the unloader is connected to the base above by a nitrogen spring; multiple through holes are opened on the periphery of the unloading platform, and the guide post sleeve is connected to the corresponding through hole.

5. A CNC tube expanding and polishing machine for an air conditioning liquid receiver as described in claim 4, characterized in that, The positioning part is connected to the lower part of the expanding part to form a U-shaped structure with the opening groove facing the side of the pressing tube assembly; the positioning part is connected to the base by bolts; the bottom part of the first end of the workpiece is connected to the top of the unloader.

6. The CNC tube expanding and polishing machine for an air conditioning liquid receiver as described in claim 5, characterized in that, The pressure tube assembly includes a positioning seat, a driving device, a pressure plate, and a pressure rod assembly; The positioning seat is connected to the frame, the driving device is connected above the positioning seat, and the driving end of the driving device extends into the interior of the positioning seat; the pressure plate is connected to the bottom of the driving end; the pressure rod assembly includes a pressure rod and a pressure sleeve connected below the pressure rod, the pressure sleeve can press down on the second end face of the workpiece under the driving action of the driving device, so that the workpiece moves along the guide slope of the expansion part of the expansion mold, so that the first end of the workpiece forms an expansion.

7. A CNC tube expanding and polishing machine for an air conditioning liquid receiver as described in claim 1, characterized in that, The brushing assembly includes a drive mechanism and a polishing assembly; The polishing assembly includes a connecting disk, a rotating shaft, and a connecting shaft; the drive mechanism is connected to the frame, the top of the output shaft of the drive mechanism is connected to the connecting disk, the top of the connecting disk is connected to the rotating shaft, and the top of the rotating shaft is connected to the connecting shaft.

8. A CNC tube expanding and polishing machine for an air conditioning liquid receiver as described in claim 7, characterized in that, The rotating shaft is connected to a polishing brush on its periphery for cleaning foreign objects generated during polishing on the workpiece; a polishing wheel is connected to the connecting shaft, and the connecting disc, rotating shaft and connecting shaft are driven to rotate by a drive mechanism so that the polishing wheel rotates relative to the inner circumference of the workpiece to polish the inner wall of the workpiece.

9. A CNC tube expanding and polishing machine for an air conditioning liquid receiver as described in claim 8, characterized in that, The adjustment assembly includes a support, a drive component, a sliding component, and a gripper assembly; The top of the support is connected to a driving component, and the output shaft of the driving component extends into the support and connects to the top of the sliding assembly. The sliding assembly has a fixed end that extends into the support and connects to the driving component, and a sliding end that extends out of the support and can be slidably connected to the support. The gripper assembly is connected to the sliding end and has grippers for holding the workpiece. The gripper assembly can hold the workpiece and move it up and down relative to the polishing wheel under the action of the sliding assembly.

10. A CNC tube expanding and polishing machine for an air conditioning liquid receiver as described in claim 9, characterized in that, The sliding assembly includes a connecting plate and a connecting bracket connected together; The connecting bracket forms a fixed end and is connected to the lower part of the output shaft of the drive component; the connecting plate forms the sliding end, and the side of the connecting plate facing the support has a sliding block, and the side of the support has a slide rail, so that the connecting plate is vertically slidably connected to the support through the sliding block and the slide rail; the gripper assembly is connected to the side of the connecting plate opposite to the support.

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