Heat Exchanger Tube Expander

Abstract

The present invention discloses a tube expanding machine for a heat exchanger. The tube expanding machine for the heat exchanger includes: a workbench, on which an installation seat for placing the heat exchanger to be tube-expanded is movably arranged; a clamping seat, detachably connected to the workbench, and the clamping seat is provided with a groove adapted to the shape of the bent pipe end of the heat exchanger; a pushing mechanism, arranged on the workbench, for pushing the installation seat to move towards one side of the clamping seat so that the bent pipe end of the heat exchanger is fitted into the groove; a tube expanding member, detachably connected to the workbench, one end of the tube expanding member faces the straight pipe end of the heat exchanger, and the tube expanding member is connected with a first linear driving mechanism for driving it to reciprocate linearly. Driven by the first linear driving mechanism, the tube expanding member can be inserted into the straight pipe end of the heat exchanger for tube expanding treatment. For the tube expanding machine for the heat exchanger with the above structure, by replacing the clamping seat and the tube expanding member, the effect that one device can process heat exchangers of multiple styles is achieved, and the applicability of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tube expanding machines, and particularly to a tube expanding machine for heat exchangers. Background Art

[0002] Currently, in the assembly of heat exchangers, in order to ensure a firm fit between the heat exchange tubes and the heat dissipation fins and prevent looseness of the heat exchange tubes due to gaps between the two, it is often necessary to perform tube expanding on the heat exchange tubes. Specifically, the tube expanding process is to insert a tube expanding member into the heat exchange tube so that the tube expanding member can expand the diameter of the heat exchange tube, thereby eliminating or reducing the gap between the heat exchange tube and the heat dissipation fins.

[0003] However, for existing tube expanding machines, the same device can only perform tube expanding on the same type of heat exchanger. If the type of heat exchanger is changed, new equipment needs to be purchased again, resulting in high costs and low applicability. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a tube expanding machine for heat exchangers, which can adapt to different types of heat exchangers by replacing the clamping seat and the tube expanding member, so as to achieve the effect that one device can process multiple types of heat exchangers, thereby improving the applicability of the device.

[0005] A tube expanding machine for heat exchangers according to an embodiment of the present invention includes: a workbench, on which an installation seat for placing a heat exchanger to be tube expanded is movably arranged; a clamping seat, detachably connected to the workbench, and the clamping seat is provided with a groove adapted to the shape of the bent tube end of the heat exchanger; a pushing mechanism, arranged on the workbench, for pushing the installation seat to move towards one side of the clamping seat so that the bent tube end of the heat exchanger is fitted into the groove; a tube expanding member, detachably connected to the workbench, one end of the tube expanding member faces the straight tube end of the heat exchanger, and the tube expanding member is connected with a first linear driving mechanism for driving it to reciprocate linearly. Under the drive of the first linear driving mechanism, the tube expanding member can be inserted into the straight tube end of the heat exchanger for tube expanding treatment.

[0006] The tube expanding machine for a heat exchanger according to an embodiment of the present invention has at least the following beneficial effects: When in use, the heat exchanger is fixedly placed on the mounting base, and then the pushing mechanism pushes the mounting base to move towards the clamping seat side, so that the bent pipe end of the heat exchanger is fitted into the corresponding groove on the clamping seat, locking the mounting base. Finally, the first linear driving mechanism drives the tube expanding part to insert into the straight pipe end of the heat exchanger, thereby performing tube expanding treatment on the heat exchanger. Among them, the clamping seat and the tube expanding part are detachable relative to the workbench, enabling people to quickly replace the clamping seat and the tube expanding part, so as to adapt to the tube expanding treatment of different styles of heat exchangers, and further achieving the effect that one device can process multiple styles of heat exchangers, improving the applicability of the device.

[0007] In some embodiments of the present invention, the workbench is provided with a first guide rail whose extending direction faces the clamping seat. The first guide rail is movably provided with a first moving seat. The tube expanding part is detachably connected to the first moving seat, and the first linear driving mechanism drives the first moving seat to move along the length direction of the first guide rail.

[0008] In some embodiments of the present invention, one of the tube expanding part and the first moving seat is provided with a first slot with an upward-facing notch, and the other is provided with a first clamping part that tightly fits with the first slot, so that the tube expanding part can be detachably mounted relative to the first moving seat.

[0009] In some embodiments of the present invention, the first moving seat includes two oppositely arranged mounting plates. The first slot extends vertically on the mounting plate. The tube expanding part includes a clamping plate and a tube expanding rod connected to the clamping plate. The tube expanding rod extends in a direction parallel to the first guide rail. The clamping plate is clamped between the two mounting plates, and the first clamping parts are respectively arranged on both sides of the clamping plate corresponding to the first slot.

[0010] In some embodiments of the present invention, the first linear driving mechanism includes a lead screw parallel to the first guide rail. The first moving seat is movably arranged on the lead screw. The lead screw is connected to a rotating motor that drives it to rotate. Driven by the rotating motor, the lead screw drives the first moving seat to reciprocate towards the clamping seat side.

[0011] In some embodiments of the present invention, the workbench is provided with a fixed seat opposite to the first moving seat. One of the clamping seat and the fixed seat is provided with a second slot extending vertically, and the other is provided with a second clamping part that tightly fits with the second slot, so that the clamping seat can be detachably mounted relative to the fixed seat in the vertical direction.

[0012] In some embodiments of the present invention, the pressing mechanism includes a second moving seat movably disposed on the first guide rail. The second moving seat is connected to a first linear driver that drives it to perform linear reciprocating motion. The second moving seat is detachably connected to a crimping sleeve that can fit over the straight pipe end of the heat exchanger. The axes of the crimping sleeve, the expanding member, and the straight pipe end of the heat exchanger are collinear.

[0013] In some embodiments of the present invention, the workbench is movably provided with a third moving seat located between the clamping seat and the pressing mechanism. The third moving seat is connected to a second linear driving mechanism that drives it to perform linear reciprocating motion. The mounting seat is disposed on the third moving seat. Driven by the second linear driving mechanism, the mounting seat can move to a position aligned with the clamping seat.

[0014] In some embodiments of the present invention, the third moving seat is provided with a second guide rail parallel to the first guide rail. The mounting seat is movably disposed on the second guide rail. Driven by the pressing mechanism, the mounting seat moves along the length direction of the second guide rail.

[0015] In some embodiments of the present invention, the workbench is provided with a mounting frame. The mounting frame is movably provided with a pressing seat located above the mounting seat. The pressing seat is connected to a second linear driver that drives it to perform reciprocating motion in the vertical direction.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a schematic structural diagram of an embodiment of a heat exchanger tube expanding machine of the present invention;

[0019] Figure 2 is Figure 1 a schematic structural diagram of an embodiment of the heat exchanger processed in the embodiment;

[0020] Figure 3 is Figure 1 a schematic structural diagram of the embodiment with the protective cover removed;

[0021] Figure 4 is Figure 1 a partial exploded view of the expanding member and the first moving seat in the embodiment;

[0022] Figure 5 isFigure 1 Schematic structural diagram of the clamping seat and the fixed seat in the embodiment.

[0023] In the figure: workbench 100, elbow end 101, straight pipe end 102, protective cover 103, mounting seat 110, third moving seat 120, second guide rail 121, mounting bracket 130, pressing seat 140, second linear driver 150, clamping seat 200, fixed seat 210, second slot 201, lifting part 202, pressing mechanism 300, second moving seat 310, first linear driver 320, edge pressing sleeve 330, expanding part 400, first slot 401, first clamping part 402, clamping plate 403, expanding rod 404, hook part 405, first guide rail 410, first moving seat 420, mounting plate 421, lead screw 500. Detailed implementation manners

[0024] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that with regard to the orientation description, for example, terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0026] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounting", "connecting", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] See Figures 1 to 5 Figures 1 to 5 , a tube expanding machine for a heat exchanger, comprising: a workbench 100, on which an installation seat 110 for placing a heat exchanger to be tube-expanded is movably arranged; a clamping seat 200, detachably connected to the workbench 100, and the clamping seat 200 is provided with a groove adapted to the shape of the bent pipe end 101 of the heat exchanger; a pushing mechanism 300, arranged on the workbench 100, for pushing the installation seat 110 to move towards one side of the clamping seat 200, so that the bent pipe end 101 of the heat exchanger is fitted into the groove; a tube expanding member 400, detachably connected to the workbench 100, one end of the tube expanding member 400 faces the straight pipe end 102 of the heat exchanger, and the tube expanding member 400 is connected with a first linear driving mechanism for driving it to reciprocate linearly. Driven by the first linear driving mechanism, the tube expanding member 400 can be inserted into the straight pipe end 102 of the heat exchanger for tube expanding treatment.

[0029] For the tube expanding machine of the above structure, during use, first, the heat exchanger is fixedly placed on the installation seat 110, and then the pushing mechanism 300 pushes the installation seat 110 to move towards one side of the clamping seat 200, so that the bent pipe end 101 of the heat exchanger is fitted into the corresponding groove on the clamping seat 200, thereby applying force to the installation seat 110 for locking on both sides. Finally, the first linear driving mechanism drives the tube expanding member 400 to be inserted into the straight pipe end 102 of the heat exchanger, thereby performing tube expanding treatment on the heat exchanger. Among them, the clamping seat 200 and the tube expanding member 400 are detachable relative to the workbench 100, enabling people to quickly replace the clamping seat 200 and the tube expanding member 400, so as to adapt to the tube expanding treatment of different styles of heat exchangers, and further achieving the effect that one device can process multiple styles of heat exchangers, improving the applicability of the device.

[0030] See Figure 3 and Figure 4 Figure 4 , in some embodiments of the present invention, the workbench 100 is provided with a first guide rail 410 whose extending direction faces the clamping seat 200. A first moving seat 420 is movably arranged on the first guide rail 410, and the tube expanding member 400 is detachably connected to the first moving seat 420. The first linear driving mechanism drives the first moving seat 420 to move along the length direction of the first guide rail 410. Specifically, the cooperation between the first guide rail 410 and the first moving seat 420 is beneficial to guiding and limiting the movement of the tube expanding member 400, so as to ensure that the tube expanding member 400 can accurately align with the straight pipe end 102 of the heat exchanger, and avoid the movement of the tube expanding member 400 from shifting and affecting the tube expanding treatment of the heat exchanger. It can be understood that, in order to improve the smoothness of the movement of the first moving seat 420, two first guide rails 410 are provided, and the two first guide rails 410 are symmetrically distributed on both sides of the first moving seat.

[0031] See Figure 3 and Figure 4, in some embodiments of the present invention, one of the expansion member 400 and the first moving seat 420 is provided with a first slot 401 with an upward-facing notch, and the other is provided with a first clamping portion 402 that tightly fits with the first slot 401, so that the expansion member 400 can be detachably installed relative to the first moving seat 420. Specifically, the expansion member 400 can be detachably installed relative to the first moving seat 420, such that people only need to pull the first clamping portion 402 upward from the first slot 401 to quickly disassemble and replace the expansion member 400, and the operation is simple. Among them, the first slot 401 is set as a square strip, and the shape of the first clamping portion 402 is adapted to that of the first slot 401, so that the two can form a tight fit with surface-to-surface contact, thereby avoiding the problem of looseness of the expansion member 400 during use. Of course, it can be understood that a magnetic attraction structure can also be provided between the expansion member 400 and the first moving seat 420 for locking, and unlocking can be completed by overcoming the magnetic attraction force between the two, and the disassembly is also relatively fast and convenient.

[0032] See Figure 3 and Figure 4 , in some embodiments of the present invention, the first moving seat 420 includes two oppositely arranged mounting plates 421, the first slot 401 is arranged along the vertical direction on the mounting plate 421, the expansion member 400 includes a clamping plate 403 and an expansion rod 404 connected to the clamping plate 403, the expansion rod 404 extends along a direction parallel to the first guide rail 410, the clamping plate 403 is clamped between the two mounting plates 421, and the first clamping portions 402 are respectively arranged on both sides of the clamping plate 403 corresponding to the first slot 401. Specifically, the clamping plate 403 is correspondingly inserted into the first slot 401 on the mounting plate 421 through the first clamping portion 402, which is beneficial to clamping the clamping plate 403 on both sides, thereby facilitating the avoidance of the deviation of the expansion rod 404 during the tube expansion process, and further ensuring the accurate alignment of the movement of the expansion rod 404. It can be understood that in order to facilitate people to pull out the expansion member 400, a hook portion 405 for facilitating people to apply force to lift the expansion member 400 can also be provided on the upper part of the clamping plate 403.

[0033] See Figure 3 and Figure 4, in some embodiments of the present invention, the first linear drive mechanism includes a lead screw 500 parallel to the first guide rail 410. The first moving seat 420 is movably disposed on the lead screw 500. The lead screw 500 is connected to a rotary motor that drives it to rotate. Under the drive of the rotary motor, the lead screw 500 drives the first moving seat 420 to reciprocate toward the side of the clamping seat 200. Specifically, the first moving seat 420 is slidably connected to the lead screw 500 through a ball nut. The lead screw 500 is connected to the output shaft of the rotary motor. Thus, under the drive of the rotary motor, the lead screw 500 rotates to drive the ball nut to move along its length direction, and further drives the first moving seat 420 to move. Among them, the use of the lead screw 500 transmission method can not only regulate the moving speed of the first moving seat 420, but also adjust the displacement of the first moving seat 420, which is beneficial for the expansion tube member 400 to expand the metal tube with a stable feed amount, improving the smoothness and moving accuracy of the tube expansion process. Of course, in some embodiments, the first linear drive mechanism can also be a motor-driven gear-rack method, which will not be elaborated here.

[0034] See Figure 5 , in some embodiments of the present invention, the workbench 100 is provided with a fixed seat 210 opposite to the first moving seat 420. One of the clamping seat 200 and the fixed seat 210 is provided with a second slot 201 extending in the vertical direction, and the other is provided with a second clamping portion that tightly fits with the second slot 201, so that the clamping seat 200 can be detachably installed relative to the fixed seat 210 in the vertical direction. Specifically, the formation of a tightly fitting plug-in installation between the clamping seat 200 and the fixed seat 210 is beneficial for simplifying the installation process of the clamping seat 200 and improving the installation efficiency of the clamping seat 200. Of course, the clamping seat 200 is provided with a lifting portion 202 through which a human hand can pass. The lifting portion 202 can provide a force application position for lifting the clamping seat 200, thus facilitating people's daily use. It can be understood that a magnetic attraction structure can also be provided between the clamping seat 200 and the fixed seat 210 for locking. Unlocking only needs to overcome the magnetic attraction force between the two to complete the separation, and the disassembly is also relatively fast and convenient.

[0035] See Figure 3, in some embodiments of the present invention, the pressing mechanism 300 includes a second moving seat 310 movably disposed on the first guide rail 410. The second moving seat 310 is connected to a first linear driver 320 that drives it to reciprocate linearly. The second moving seat 310 is detachably connected to a crimping sleeve 330 that can fit over the straight pipe end 102 of the heat exchanger. The axes of the crimping sleeve 330, the expansion member 400, and the straight pipe end 102 of the heat exchanger are collinear. Specifically, driving the crimping sleeve 330 to fit over the straight pipe end 102 of the heat exchanger by the first linear driver 320 is beneficial to reducing deformation phenomena such as inclination of the straight pipe end 102 of the heat exchanger during the tube expanding process, thereby improving the quality of the tube expanding of the product. Among them, in order to facilitate the replacement of the crimping sleeve 330, the second moving seat 310 is provided with a third slot, and multiple crimping sleeves 330 are connected to the same plug-in board. The plug-in board is provided with a third clamping portion that tightly fits with the third slot. The plug-in board and the second moving seat 310 form a plug-in installation, which can also achieve the effect of quickly replacing the crimping sleeve 330 to facilitate the subsequent cooperation of the crimping sleeve 330 with heat exchangers of different styles. It can be understood that the first linear driver 320 can be selected as a cylinder or a hydraulic cylinder for driving according to the actual situation.

[0036] See Figure 3 , in some embodiments of the present invention, the workbench 100 movably has a third moving seat 120 located between the clamping seat 200 and the pressing mechanism 300. The third moving seat 120 is connected to a second linear driving mechanism that drives it to move linearly back and forth. The mounting seat 110 is disposed on the third moving seat 120. Driven by the second linear driving mechanism, the mounting seat 110 can move to a position aligned with the clamping seat 200. Specifically, the workbench 100 is provided with a protective cover 103 that encloses a square space for tube expanding processing, and an area where the third moving seat 120 extends out of the square space is reserved. Then people can move the mounting seat 110 out of the protective cover 103 through the second linear driving mechanism, which is beneficial for people to install the heat exchanger at a position where the mounting seat 110 is far from the tube expanding process, improving the safety of the operator. It can be understood that the second linear driving mechanism can be selected as a motor-driven lead screw mechanism or a motor-driven gear and rack mechanism according to actual requirements.

[0037] See Figure 3, in some embodiments of the present invention, the third moving seat 120 is provided with a second guide rail 121 parallel to the first guide rail 410. The mounting seat 110 is movably arranged on the second guide rail 121. Driven by the pressing mechanism 300, the mounting seat 110 moves along the length direction of the second guide rail 121. Specifically, when the mounting seat 110 moves to the position aligned with the clamping seat 200, the pressing mechanism 300 drives the mounting seat 110 to move along the length direction of the second guide rail 121 close to the clamping seat 200, so as to play a guiding and limiting role in the movement of the mounting seat 110, and further avoid the deviation of the movement of the mounting seat 110, which may affect the subsequent processing.

[0038] See Figure 3 , in some embodiments of the present invention, the workbench 100 is provided with a mounting frame 130. The mounting frame 130 is movably provided with a pressing seat 140 located above the mounting seat 110. The pressing seat 140 is connected with a second linear driver 150 that drives it to reciprocate in the vertical direction. Specifically, by moving the pressing seat 140 to abut against the heat exchanger to be processed, a pressing force in the vertical direction is applied to the heat exchanger, so as to prevent the heat exchanger from being misaligned during the tube expanding process. It can be understood that the second linear driver 150 can be selected as a cylinder or a hydraulic cylinder for driving according to the actual situation.

[0039] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0040] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A tube expanding machine for a heat exchanger, characterized in that, Comprising: A workbench (100) is movably provided with a mounting seat (110) for placing a heat exchanger to be expanded tube; A clamping seat (200) is detachably connected to the workbench (100), and the clamping seat (200) is provided with a groove adapted to the shape of the bent pipe end (101) of the heat exchanger; A pushing mechanism (300) is arranged on the workbench (100) for pushing the mounting seat (110) to move towards one side of the clamping seat (200) so that the bent pipe end (101) of the heat exchanger is fitted into the groove; An expanding pipe member (400) is detachably connected to the workbench (100), one end of the expanding pipe member (400) faces the straight pipe end (102) of the heat exchanger, and the expanding pipe member (400) is connected with a first linear driving mechanism for driving it to reciprocate linearly. Driven by the first linear driving mechanism, the expanding pipe member (400) can be inserted into the straight pipe end (102) of the heat exchanger for expanding tube treatment; The workbench (100) is provided with a first guide rail (410) extending in the direction towards the clamping seat (200), and a first moving seat (420) is movably arranged on the first guide rail (410). The expanding pipe member (400) is detachably connected to the first moving seat (420), and the first linear driving mechanism drives the first moving seat (420) to move along the length direction of the first guide rail (410); One of the expanding pipe member (400) and the first moving seat (420) is provided with a first slot (401) with the notch facing upwards, and the other is provided with a first clamping portion (402) tightly fitted with the first slot (401) so that the expanding pipe member (400) can form a plug-in installation relative to the first moving seat (420); The expanding pipe member (400) and the first moving seat (420) are also provided with a magnetic attraction structure for locking.

2. The heat exchanger expanding tube machine according to claim 1, wherein: The first moving seat (420) includes two oppositely arranged mounting plates (421), the first slot (401) extends in the vertical direction on the mounting plate (421), the expanding pipe member (400) includes a clamping plate (403) and an expanding rod (404) connected to the clamping plate (403), the expanding rod (404) extends in a direction parallel to the first guide rail (410), the clamping plate (403) is clamped between the two mounting plates (421), and the first clamping portions (402) are respectively arranged on both sides of the clamping plate (403) corresponding to the first slot (401).

3. The heat exchanger expanding tube machine according to claim 1, wherein: The first linear drive mechanism includes a lead screw (500) parallel to the first guide rail (410). The first moving seat (420) is movably arranged on the lead screw (500). The lead screw (500) is connected with a rotary motor for driving its rotation. Driven by the rotary motor, the lead screw (500) drives the first moving seat (420) to reciprocate towards the side of the clamping seat (200).

4. The tube expanding machine for heat exchanger according to claim 1, wherein: The workbench (100) is provided with a fixed seat (210) opposite to the first moving seat (420). One of the clamping seat (200) and the fixed seat (210) is provided with a second slot (201) extending in the vertical direction, and the other is provided with a second clamping portion tightly fitted with the second slot (201), so that the clamping seat (200) can be detachably installed relative to the fixed seat (210) in a plug-in manner along the vertical direction.

5. The tube expanding machine for heat exchanger according to claim 1, wherein: The pressing mechanism (300) includes a second moving seat (310) movably arranged on the first guide rail (410). The second moving seat (310) is connected with a first linear driver (320) for driving its reciprocating linear motion. The second moving seat (310) is detachably connected with a flanging sleeve (330) capable of sleeving on the straight tube end (102) of the heat exchanger. The axes of the flanging sleeve (330), the tube expanding part (400), and the straight tube end (102) of the heat exchanger are collinear.

6. The tube expanding machine for heat exchanger according to claim 1, wherein: The workbench (100) is movably provided with a third moving seat (120) between the clamping seat (200) and the pressing mechanism (300). The third moving seat (120) is connected with a second linear drive mechanism for driving its linear reciprocating motion. The mounting seat (110) is arranged on the third moving seat (120). Driven by the second linear drive mechanism, the mounting seat (110) can move to a position aligned with the clamping seat (200).

7. The tube expanding machine for heat exchanger according to claim 6, wherein: The third moving seat (120) is provided with a second guide rail (121) parallel to the first guide rail (410). The mounting seat (110) is movably arranged on the second guide rail (121). Driven by the pressing mechanism (300), the mounting seat (110) moves along the length direction of the second guide rail (121).

8. The tube expanding machine for heat exchanger according to claim 6, wherein: The workbench (100) is provided with a mounting frame (130). The mounting frame (130) is movably provided with a pressing seat (140) above the mounting seat (110). The pressing seat (140) is connected with a second linear driver (150) for driving its reciprocating motion in the vertical direction.

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