Tube Expanding Machine

Abstract

To provide a tube expander. [Solution] A tube expanding machine is disclosed that includes a base, an expander and a conveying device provided on the base, the expander includes a tube expanding mechanism and a tube abutment mechanism, the tube expanding mechanism includes a tube expanding mandrel and a tube expanding mandrel drive mechanism for moving the tube expanding mandrel, and the tube abutment mechanism includes a tube abutment extension / retraction positioning mechanism and a tube abutment drive mechanism for moving the tube abutment extension / retraction positioning mechanism. This tube expanding machine expands a heat exchange tube of a heat exchanger via the tube expanding mandrel of the tube expanding mechanism, and while expanding, the other end abuts against an end of the heat exchange tube using the tube abutment extension / retraction positioning mechanism, and when the end of the heat exchange tube is drawn into a heat dissipation fin module, it can be maintained in contact with the end face of the heat exchange tube until the heat exchange tube is drawn into the heat dissipation fin module after the final tube expansion is completed. The conveying device of this tube expansion machine can expand the heat exchange tubes in each layer of the heat exchanger by raising and lowering the lifting support table, and the cooperation between the lifting plate and the conveying stand enables the cyclical operation of supplying, expanding and discharging the heat exchanger, improving production efficiency.

Description

[Technical field]

[0001] The present invention relates to an expansion device for heat exchanger tubes, and more particularly to a tube expander. [Background technology]

[0002] In order to achieve a good heat exchange effect, the heat exchange tubes in the heat exchanger of the central air conditioning need to expand and be in close contact with the heat dissipation fin module, and the above structure is generally achieved by a tube expansion machine.

[0003] In a typical central air conditioner, both ends of the heat exchanger tube protrude from both sides of the fin module. However, in some current water-type central air conditioner heat exchangers, both ends of the heat exchanger tube are flush with both sides of the heat dissipation fin module. If a conventional expander is used, the protruding heat exchanger tubes at both ends must be cut off after expansion is complete, which not only requires labor but also wastes materials. Therefore, conventional expanders are not suitable for expanding this model of heat exchanger. In addition, it is necessary to adapt to the expansion of heat exchangers of various specifications, and to connect and match with subsequent equipment, and the conveying device of the expander must also be redesigned. Therefore, the applicant has designed a tube expander that solves all of the above problems. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENT The present invention provides a tube expander to overcome the shortcomings of the prior art. [Means for solving the problem]

[0005] The technical means adopted by the present invention to solve the technical problem is a tube expansion machine comprising a base, an expander and a conveying device provided on the base, the expander comprising a tube expansion mechanism and a tube abutment mechanism, the tube expansion mechanism comprising a tube expansion mandrel, a tube expansion mandrel drive mechanism for moving the tube expansion mandrel, and a front guide device for guiding the tube expansion mandrel, the tube abutment mechanism comprising a tube abutment telescopic positioning mechanism and a tube abutment drive mechanism for moving the tube abutment telescopic positioning mechanism, the tube abutment telescopic positioning mechanism comprising a rear abutment rod and a rear abutment the rear butt rod is slidably fitted into a socket hole of the rear butt socket, and a restricting structure is provided between the rear butt socket and the rear butt rod to prevent the rear butt socket from falling off the rear butt rod, the elastic restoring member is provided on the rear butt rod and can push in the rear butt socket; the transport device includes a lifting support, the lifting support is connected to a base via a lifting drive structure, a plurality of lifting supports are provided on the lifting support, and a lifting drive unit and a lifting drive unit are provided on the lifting support. a lifting plate driven by a lifting drive unit and a conveying platform and a conveying drive structure for moving and driving the conveying platform are provided on the lifting platform, the heat exchanger can be conveyed to the expanding position and the next processing position by the conveying platform, the lifting plate can lift the heat exchanger at the expanding position, and the heat exchanger at the expanding position can be expanded by the expander, the expanding mandrel drive mechanism includes a mandrel drive frame, a first guide rail assembly and a first ball screw assembly provided on a base, the mandrel drive frame is connected to the first guide rail assembly and the first ball screw assembly, a mandrel drive motor is provided on the mandrel drive frame, and the mandrel drive motor is connected to the ball screw assembly via a mandrel transmission mechanism and drives a nut in the ball screw assembly to rotate, thereby moving the entire mandrel drive frame, the expanding mandrel is fixed to a receiving hole of the mandrel drive frame, the front guide device includes a guide tube and a front guide frame, and the guide tube is fixed to the front guide frame,The expansion mandrel is inserted through a guide tube.

[0006] The rear abutment rod includes a first rod and a second rod, the first rod is slidably fitted into a socket hole of the rear abutment socket, and a relief hole is provided in an end face of the first rod.

[0007] The rod head limiting structure comprises a step surface provided on the first rod and a convex ring provided within the socket hole, the convex ring being capable of abutting the step surface, the first rod comprising a rod head and a rod body, and the step surface being configured as an end surface where the rod head and the rod body intersect.

[0008] The lifting drive structure includes a lifting drive motor, a transmission structure, and four lifts arranged in a rectangle, the lifting support is fixed to the lifts, and the lifting drive motor is connected to the four lifts via the transmission structure, thereby driving the four lifts to lift and lower simultaneously.

[0009] The conveying drive structure includes a conveying motor provided on the lifting platform and a reducer, a drive gear is provided on the output shaft of the reducer, the conveying platform is connected to the lifting platform via a second guide rail assembly, and a rack that meshes with the drive gear is provided on the conveying platform.

[0010] The transport platform has transport plates arranged opposite each other, both ends of the transport plates are fixed together via connecting rods, the second guide rail assemblies are provided on both sides of the lifting support, and the lifting support is located between the two transport plates.

[0011] A plurality of sliding guide mechanisms are provided between the expansion mandrel drive mechanism and the front guide device, and the sliding guide mechanisms include guide slide shafts arranged opposite each other on a base, and guide sliders that slide onto the guide slide shafts, the guide sliders are connected to each other by guy ropes, the guide slider closest to the front guide device is connected to the front guide device by a guy rope, the guide slider closest to the mandrel drive frame is connected to the mandrel drive frame by a guy rope, guide sliding holes are provided on the guide sliders, and the expansion mandrel is slidably fitted into the guide sliding holes.

[0012] The mandrel drive frame is provided with a guide plate and a locking plate, the receiving hole is located on the guide plate, the guide plate has an accommodating hole connected to the receiving hole, the locking plate has an locking hole and an escape hole partially intersecting the locking hole, and a limit ring is provided on the expansion mandrel, and when the limit ring is positioned in the accommodating hole, the locking plate is lowered by the lock drive unit, so that the position of the locking hole becomes coaxial with the expansion mandrel and can abut against the limit ring. Effect of the Invention

[0013] The advantageous effect of the present invention is that the tube expander expands the heat exchange tube of the heat exchanger through the tube expansion mandrel of the tube expansion mechanism, and while expanding, the other end of the tube abuts against the end of the heat exchange tube using the tube abutment telescopic positioning mechanism, and when the end of the heat exchange tube is drawn into the heat dissipation fin module, the tube abutment telescopic positioning mechanism can always be kept abutting the end face of the heat exchange tube until the heat exchange tube is drawn into the heat dissipation fin module after the final tube expansion is completed. The heat exchanger manufactured by the above-mentioned structure does not need to cut the heat exchange tube, and not only reduces the process but also saves materials, so that the manufacturing cost is reduced. The lifting support of the tube expander transport device is connected to the base through the lifting drive structure, and the heat exchange tubes of each layer of the heat exchanger can be expanded by lifting and lowering the lifting support, and the cooperation of the lifting plate and the transport platform realizes the cycle of supplying, expanding, and discharging the heat exchanger, improving the production efficiency.

[0014] The present invention will be further described below with reference to the drawings and embodiments. [Brief description of the drawings]

[0015] [Figure 1] 1 is an overall configuration diagram of the present invention; [Diagram 2] FIG. 4 is a configuration diagram of a pipe abutment drive mechanism. [Diagram 3] FIG. 1 is a schematic diagram of a pipe abutting extension / retraction positioning mechanism according to the present invention, which has just begun pipe expansion. [Figure 4] FIG. 1 is a cross-sectional view of the present invention. [Diagram 5] FIG. 4 is a diagram showing the configuration of the pipe abutting extension / retraction positioning mechanism after pipe expansion is completed according to the present invention. [Figure 6] FIG. 4 is a configuration diagram of a tube expansion mechanism and a sliding guide mechanism. [Figure 7] 4 is a cross-sectional view showing a fixing structure between the tube expansion mandrel and the mandrel drive frame. FIG. [Figure 8] FIG. 2 is a configuration diagram of a front guide device. [Figure 9] FIG. [Figure 10] FIG. 4 is a configuration diagram of an elevator and a transmission shaft arrangement. [Figure 11] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The advantages and features of the present disclosure, as well as the implementation method thereof, will be made clear by the following embodiments, which are illustrated with reference to the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. The present invention is limited only by the scope of the claims.

[0017] The shapes, dimensions, ratios, angles, and numbers disclosed in the drawings used to describe the embodiments of the present invention are merely examples, and the present disclosure is not limited to the contents shown in the drawings. The same reference numerals represent the same elements throughout the present specification. In the following description of the present invention, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present invention. When "comprises", "has", and "includes" are used in the present specification, other components may be added unless "only" is used. Singular terms may include plural forms as well, unless the context clearly indicates otherwise.

[0018] When construing the components, it is understood that the components include a margin of error, although not expressly stated.

[0019] When describing a positional relationship, for example, when describing a positional relationship as "on," "above," "below," or "adjacent to," one or more parts may be located between other parts, as long as "closely attached" or "directly" is not used.

[0020] When describing temporal relationships, for example describing the temporal order using "after", "then", "next" and "before", discontinuous situations may be included unless "just" or "directly" are used.

[0021] It will be understood that although terms such as "first", "second" and the like may be used herein to describe various components, these components should not be limited by these terms. These terms are used only to distinguish one component from another. For example, a first component can be referred to as a second component, and similarly, a second component can be referred to as a first component, without departing from the scope of the present disclosure.

[0022] As will be appreciated by those skilled in the art, features of different embodiments of the present disclosure may be partially or fully combined or combined with each other, may cooperate with each other in various ways, and may be driven technically. The embodiments of the present disclosure may be implemented independently of each other, or may be implemented together in a mutually dependent manner.

[0023] Referring to FIG. 1, the present invention discloses a tube expansion machine comprising a base 1, an expander and a conveying device 111 mounted on the base 1, the expander comprising an expanding mechanism 112 and a tube abutting mechanism 113, the expanding mechanism 112 comprising an expanding mandrel 13, an expanding mandrel driving mechanism for moving the expanding mandrel 13, and a front guide device for guiding the expanding mandrel 13, after the heat exchanger 114 is conveyed to the expanding position by the conveying device 111, the tube abutting mechanism 113 abuts against the end of the heat exchange tube, and at the same time, the expanding mandrel 13 is inserted into the end of the heat exchange tube through the guidance of the front guide device to expand the tube, and the end after expansion is tightly connected to the heat dissipation fin module, so that the shrinkage movement of the heat exchange tube is finally concentrated at the end, and of course, after the expansion is completed, the end is just pulled into the heat dissipation fin module, and the remaining shrinkage amount of the end is calculated so that it is flush with the heat dissipation fin module.

[0024] As shown in Figures 2 to 5, the pipe butt mechanism 113 comprises a pipe butt telescopic positioning mechanism and a pipe butt drive mechanism which moves the pipe butt telescopic positioning mechanism, and the pipe butt telescopic positioning mechanism comprises a rear butt rod 12, a rear butt socket 2 and an elastic return member 3, the rear butt rod 12 is slidably fitted into the socket hole of the rear butt socket 2, a limiting structure is provided between the rear butt socket 2 and the rear butt rod 12 to prevent the rear butt socket 2 from falling off from the rear butt rod 12, and the elastic return member 3 is provided on the rear butt rod 12 and can push in the rear butt socket 2. With the above-mentioned structure, in the final stage of tube expansion, the rear butt socket 2 can move back along the rear butt rod 12 after contacting the side of the heat dissipation fin module 4, so that the end face of the rear butt rod 12 can always be kept in contact with the end face of the heat exchanger tube 5 until the heat exchanger tube 5 is pulled into the heat dissipation fin module 4 after the final tube expansion is completed.

[0025] In this application, for convenience of manufacturing and assembly, the rear butt rod 12 comprises a first rod 6 and a second rod 7, and the first rod 6 is slidably fitted into the socket hole of the rear butt socket 2, so that when the rear butt socket 2 fits the end of the heat exchange tube 5, the end face of the first rod 6 abuts against the end face of the heat exchange tube 5. As a further structure, an escape hole 8 is provided in the end face of the first rod 6, and the escape hole 8 is a tapered hole, and since an accommodation space is required for the end of the tube expansion mandrel 13 through which the other end passes after tube expansion is completed, the escape hole 8 needs to be a tapered hole that matches the taper of the end of the tube expansion mandrel 13.

[0026] As shown in the figure, the rod head limiting structure comprises a stepped surface provided on the first rod 6 and a convex ring 9 provided in the socket hole, the convex ring 9 being able to abut against the stepped surface, the first rod 6 comprising a rod head and a rod body, the stepped surface being formed by the end surface where the rod head and the rod body intersect, and naturally, the diameter of the rod head is larger than the diameter of the rod body, so that when the elastic return member 3 pushes in the rear abutment socket 2, the rear abutment socket 2 will not fall off the first rod 6 due to the restriction of the stepped surface.

[0027] As shown in the figure, the elastic return member 3 is a compression spring, a connecting screw hole is provided on the second rod 7, and a connecting screw portion that fits the connecting screw hole is provided on the first rod 6. Since the diameter of the second rod 7 is larger than the diameter of the first rod 6, the end edge of the second rod 7 is higher than the outer surface of the first rod 6, so that one end of the compression spring can abut against the end face of the second rod 7, and the other end of the compression spring abuts against the rear butt socket 2. Since the compression spring is a conventional part that is easily available and inexpensive, after the rear butt socket 2 contracts, it can return to its original position by being pushed by the compression spring.

[0028] As shown in the figure, a through hole 10 is provided in both the first rod 6 and the second rod 7, the second rod 7 is connected to an oil hose adapter 11, the through hole 10 is connected to the inner hole of the oil hose adapter 11, and the oil hose adapter 11 is connected to an external oil pump, so that during expansion, lubricating oil is pressure-fed into the heat exchange tube 5 through the through hole 10 to lubricate the expansion mandrel 13.

[0029] The pipe abutment drive mechanism of the present application includes a pipe abutment moving mount 14, and the pipe abutment telescopic positioning mechanism, motor 15, and belt transmission mechanism are attached to the pipe abutment moving mount 14, and the motor 15 rotates the ball screw nut via the belt transmission mechanism to move the pipe abutment moving mount 14 along the linear guide rail. The above-mentioned structure is a transmission structure commonly used in the mechanical field, so a detailed description of the specific connection relationship is omitted. With the above-mentioned mechanism, when the end of the heat exchange tube contracts, the rear abutment rod 12 is moved by the pipe abutment drive mechanism, so that the end face of the rear abutment rod 12 always abuts against the end face of the heat exchange tube 5.

[0030] As shown in Figures 6 and 7, the expansion mandrel drive mechanism comprises a mandrel drive frame 16, a first guide rail assembly 17 provided on the base 1, and a first ball screw assembly, the mandrel drive frame 16 is connected to the first guide rail assembly 17 and the first ball screw assembly, a mandrel drive motor 18 is provided on the mandrel drive frame 16, and the mandrel drive motor 18 is connected to the ball screw assembly via a mandrel transmission mechanism and drives and rotates a nut in the ball screw assembly, thereby moving the entire mandrel drive frame 16, and the expansion mandrel 13 is fixed to a receiving hole 19 of the mandrel drive frame 16. With the above-described structure, the expansion mandrel 13 can expand the tube by moving along the first guide rail assembly 17 by driving the mandrel drive motor 18, and the mandrel transmission mechanism is a belt transmission structure. Since the belt transmission structure, the first guide rail assembly 17 and the first ball screw assembly are all transmission structures commonly used in the mechanical field, a detailed explanation of the specific connection relationship will be omitted.

[0031] As shown in the figure, the specific fixing structure of the tube expansion mandrel 13 is as follows: the mandrel drive frame 16 is provided with a guide plate 20 and a locking plate 21, the receiving hole 19 is on the guide plate 20, the guide plate 20 is provided with an accommodation hole 23 connected to the receiving hole 19, the locking plate 21 is provided with an engagement hole 24 and an escape hole 25 partially intersecting with the engagement hole 24, and a limit ring 26 is provided that intersects with the engagement hole 24 and the escape hole 25 to have a gourd shape as a whole and protrudes above the tube expansion mandrel 13, and the limit ring 26 is welded to the tube expansion mandrel 13. When the limit ring 26 is located in the accommodation hole 23, the locking plate 21 is lowered by the lock drive unit 27, so that the position of the engagement hole 24 becomes coaxial with the tube expansion mandrel 13 and can abut against the limit ring 26. The lock drive unit 27 is an air cylinder. The above-mentioned structure facilitates replacement and maintenance of the expansion mandrel 13. When the locking plate 21 is raised, the retraction hole 25 becomes coaxial with the receiving hole 19 and the accommodation hole 23, and the diameters of the accommodation hole 23 and the retraction hole 25 are both larger than the receiving hole 19 and the locking hole 24, allowing the limit ring 26 to pass through. Therefore, after the expansion mandrel 13 is inserted into the receiving hole 19, the limit ring 26 can be inserted into the accommodation hole 23 through the retraction hole 25, and then the locking plate 21 is lowered to return to its original position, at which time the expansion mandrel 13 can be engaged from the retraction hole 25 into the locking hole 24. At this time, the locking hole 24 becomes coaxial with the receiving hole 19 and the accommodating hole 23, and since the diameter of the limit ring 26 is larger than the diameters of the locking hole 24 and the receiving hole 19, the limit ring 26 is locked between the locking hole 24 and the receiving hole 19, fixing the expansion mandrel 13 and the mandrel drive frame 16. Of course, in order to ensure smooth lifting and lowering of the locking plate 21, a groove is drilled in the guide plate 20, and the locking plate 21 is located within this groove, and this groove is closed by the panel 22.

[0032] 8, the front guide device includes a guide tube 28 and a front guide frame 29, the guide tube 28 is fixed to the front guide frame 29, and the tube expansion mandrel 13 is inserted through the guide tube 28. The method of fixing the guide tube 28 to the front guide frame 29 is the same as the method of fixing the tube expansion mandrel 13 to the mandrel drive frame 16, and therefore a detailed description thereof will be omitted. More preferably, a front guide frame drive device 30 that drives and moves the front guide frame 29 is attached on the front guide frame 29, and the structure and principle of the front guide frame drive device 30 are the same as those of the tube abutting drive mechanism, and therefore a detailed description thereof will be omitted.

[0033] As shown in the figure, since the expanding mandrel 13 is very long, in order to prevent bending of the expanding mandrel 13, it is necessary to provide multiple sliding guide mechanisms between the mandrel drive frame 16 and the front guide frame 29. The sliding guide mechanisms include guide slide shafts 31 arranged opposite each other on the base 1, and guide sliders 32 slidingly fitted to the guide slide shafts 31, the guide sliders 32 are connected to each other by guy ropes, the guide slider 32 closest to the front guide device is connected to the front guide device by a guy rope, the guide slider 32 closest to the mandrel drive frame 16 is connected to the mandrel drive frame 16 by a guy rope, guide sliding holes are provided on the guide sliders 32, and the expanding mandrel 13 is slidably fitted into the guide sliding holes. With the above-mentioned structure, the sliding guide mechanism is evenly arranged between the expansion mandrel drive mechanism and the front guide device, and when the mandrel drive frame 16 moves the expansion mandrel 13 to expand the tube, it gradually pushes the nearby guide slider 32 and moves together with the mandrel drive frame 16 until the expansion is completed, and resetting the guide slider 32 is also very simple, and when the mandrel drive frame 16 is reset, all the guide sliders 32 are pulled sequentially by the guy ropes to be reset, and the above-mentioned structure is simple and low cost.

[0034] As shown in Figs. 9 to 11, the conveying device 111 includes a lifting support 33, which is connected to the base 1 via a lifting support drive structure, the lifting support 33 is fixed to the lifters 34, and the lifting drive motor 35 is connected to the four lifters 34 via a transmission structure. Specific configuration of the lifting drive structure: The lifting drive structure includes a lifting drive motor 35, a transmission structure, and four lifters 34 arranged in a rectangle, the lifting drive motor 35 with a reducer is attached to the middle position of the base 1, the transmission structure includes three direction change boxes 36 arranged in a row on the base 1, and a plurality of transmission shafts 6, the positions of the direction change boxes 36 on both sides and the lifters 34 are collinear, and the direction change boxes 36 and the direction change boxes 36 and the corresponding lifters 34 are connected via transmission shafts 37. With the above-described structure, the lifting support 33 can be raised and lowered by driving the four elevators 34 up and down with one motor 15, and the lifting support 33 can be driven with higher precision than with an air cylinder or hydraulic cylinder.

[0035] In the present application, three lifting supports 38 are arranged in parallel on the lifting support 33, the lifting supports 38 are fixed on the lifting support 33 via support legs at both ends, and a lifting drive unit 39 and a lifting plate 40 driven by the lifting drive unit 39 are provided on the lifting supports 38. In the present application, the lifting drive unit 39 is an air cylinder fixed to the bottom surface of the lifting support 38 with a screw, and the shaft of the air cylinder is inserted through the lifting support 38 and fixed to the lifting plate 40, thereby raising and lowering the lifting plate 40 above the lifting support 38.

[0036] As shown in the figure, a conveying platform and a conveying drive structure for moving and driving the conveying platform are provided on the lifting platform 38, so that the heat exchanger 114 can be conveyed to the tube expansion position and the next processing position by the conveying platform, and the lifting plate 40 can lift the heat exchanger 114 at the tube expansion position. Specific configuration of the conveying drive structure: The conveying drive structure includes a conveying motor 41 provided on the lifting platform 38 and a reducer connected to the conveying motor 41, a driving gear 42 is provided on the output shaft of the reducer, the conveying platform is connected to the lifting platform 38 via a guide rail assembly, and a rack 43 meshing with the driving gear 42 is provided on the conveying platform. The above structure is simple and low cost. Specific configuration of the conveying platform: The conveying platform includes square conveying plates 44 arranged opposite each other, both ends of the conveying plate 44 are fixed together via a connecting rod 45, the guide rail assemblies are provided on both sides of the lifting platform 38, and the lifting platform 38 is located between the two conveying plates 44. Therefore, the transport stand can be moved along the lifting support 38 by the drive of the transport motor 41 to transport the heat exchanger 114.

[0037] Summary of the principle of this structure: In the initial state, the lifting support 33 is at the lowest position, the lifting plate 40 is not raised, and the top surface of the lifting plate 40 is lower than the side top edge of the transport plate 44. At this time, the left end of the transport stand is in the loading position, and the heat exchanger 114 is transported to the left end of the transport stand by the robot arm or transfer table, and at this time, the right end of the transport stand is in the expanding position, and then the left end of the transport stand moves to the expanding position, and at this time, the lifting plate 40 rises and pushes up the heat exchanger 114 before it begins to expand, and during the expanding process, the transport stand is reset, and since the left end of the transport stand is in the loading position, the heat exchanger 114 waiting to be expanded can be placed on it, At this time, the right end of the transport stand is also in the expansion position, and waits for the expansion to be completed. After the expansion is completed, the lifting plate 40 descends and drops the heat exchanger 114 that has been expanded to the right end of the transport stand. At this time, the transport stand moves again, moving the left end of the transport stand to the expansion position, and the right end of the transport stand sends the heat exchanger 114 that has been expanded to the next manufacturing equipment. At the same time, the lifting plate 40 lifts up the heat exchanger 114 waiting to be expanded and begins to expand it, thereby continuing the circulation.

[0038] The above is a detailed description of the pipe expander provided by the embodiment of the present invention, and the present specification uses specific examples to describe the principle and implementation of the present invention. The above description of the embodiment is only used to help understand the method and core concept of the present invention. At the same time, those skilled in the art will understand that the specific implementation and application scope will change based on the technical concept of the present invention, and the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A tube expanding machine comprising a base, an expander and a conveying device provided on the base, the expander comprising a tube expanding mechanism and a tube abutment mechanism, the tube expanding mechanism comprising a tube expanding mandrel, a tube expanding mandrel drive mechanism for moving the tube expanding mandrel, and a front guide device for guiding the tube expanding mandrel, the tube abutment mechanism comprising a tube abutment extension / retraction positioning mechanism and a tube abutment drive mechanism for moving the tube abutment extension / retraction positioning mechanism, the tube abutment extension / retraction positioning mechanism comprising a rear abutment rod, a rear abutment socket, and an elastic return member, the rear abutment rod being a front The rear butt socket is slidably fitted into the socket hole of the rear butt socket, and a restricting structure is provided between the rear butt socket and the rear butt rod to prevent the rear butt socket from falling off the rear butt rod, the elastic return member is provided on the rear butt rod and can push the rear butt socket, the transport device is provided with a lifting support, the lifting support is connected to the base via a lifting drive structure, a plurality of lifting supports are provided on the lifting support, a lifting drive unit is provided on the lifting support and driven by the lifting drive unit. a lifting plate is provided, a transport platform and a transport drive structure for moving and driving the transport platform are provided on the lifting support, the heat exchanger can be transported to a tube expansion position and a next processing position by the transport platform, the lifting plate can lift the heat exchanger at the tube expansion position, and the heat exchanger at the tube expansion position can be expanded by the expander, the tube expansion mandrel drive mechanism includes a mandrel drive frame, a first guide rail assembly and a first ball screw assembly provided on the base, the mandrel drive frame is connected to the first guide rail assembly and the first ball screw assembly, a mandrel drive motor is provided on the mandrel drive frame, the mandrel drive motor is connected to the ball screw assembly via a mandrel transmission mechanism and drives a nut in the ball screw assembly to rotate, thereby moving the entire mandrel drive frame, the tube expansion mandrel is fixed to a receiving hole of the mandrel drive frame, the front guide device includes a guide tube and a front guide frame, the guide tube is fixed to the front guide frame,The expansion mandrel passes through the guide tube. A tube expansion machine characterized by:

2. The rear abutting rod includes a first rod and a second rod, the first rod is slidably fitted into the socket hole of the rear abutting socket, and a relief hole is provided on an end face of the first rod. The tube expander according to claim 1.

3. The rod head limiting structure includes a step surface provided on the first rod and a protruding ring provided in the socket hole, the protruding ring being capable of contacting the step surface, the first rod including a rod head and a rod body, and the step surface being configured as an end surface where the rod head and the rod body intersect. The tube expander according to claim 2.

4. The lifting drive structure includes a lifting drive motor, a transmission structure, and four lifts arranged in a rectangle, the lifting support is fixed to the lifts, and the lifting drive motor is connected to the four lifts via the transmission structure, thereby driving the four lifts to lift and lower simultaneously. The tube expander according to claim 1.

5. The transport drive structure includes a transport motor provided on the lifting platform and a reducer, a drive gear is provided on the output shaft of the reducer, the transport platform is connected to the lifting platform via a second guide rail assembly, and a rack that meshes with the drive gear is provided on the transport platform.

5. A tube expander according to claim 4.

6. The transport platform includes transport plates arranged opposite to each other, both ends of the transport plates are fixed together via connecting rods, the second guide rail assemblies are provided on both sides of the lifting platform, and the lifting platform is located between the two transport plates.

6. A tube expander according to claim 5.

7. A plurality of sliding guide mechanisms are provided between the expanding mandrel drive mechanism and the front guide device, and the sliding guide mechanisms include guide slide shafts arranged opposite each other on the base, and guide sliders slidingly fitted to the guide slide shafts, the guide sliders are connected to each other by guy ropes, the guide slider closest to the front guide device is connected to the front guide device by the guy rope, the guide slider closest to the mandrel drive frame is connected to the mandrel drive frame by the guy rope, a guide slide hole is provided on the guide slider, and the expanding mandrel is slidingly fitted to the guide slide hole. The tube expander according to claim 1.

8. The mandrel drive frame is provided with a guide plate and a locking plate, the receiving hole is on the guide plate, an accommodation hole communicating with the receiving hole is provided on the guide plate, an engagement hole and an escape hole partially intersecting the engagement hole are provided on the engagement plate, and a limit ring protruding on the tube expansion mandrel is provided, and when the limit ring is positioned in the accommodation hole, the engagement plate is lowered by a lock drive unit to make the position of the engagement hole coaxial with the tube expansion mandrel and to abut against the limit ring. The tube expander according to claim 1.

Images