Pipe expander for heat exchanger

Abstract

The utility model discloses a heat exchanger pipe expander which comprises a machine base, a guide mechanism, a rod storage mechanism, a flexible rod and an expansion rod driving mechanism. The guide mechanism is arranged on the machine base, and a guide hole is formed in the guide mechanism; the rod storage mechanism is arranged on the machine base, the rod storage mechanism is provided with a spiral channel, and a passing opening is formed in one end of the spiral channel; a flexible rod is arranged in the guide hole in a penetrating mode, the flexible rod can move in the length direction and retract into or stretch out of the spiral channel through the passing opening, and a pipe expanding head is arranged at the end, away from the rod storage mechanism, of the flexible rod. The expansion rod driving mechanism is arranged on the machine base and used for driving the flexible rod to move in the length direction. And the spiral channel is used for spirally winding the flexible rod, so that the occupied area of equipment can be reduced, and the field utilization efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of tube expanders, in particular to a tube expander for a heat exchanger. Background Art

[0002] Some existing heat exchangers can be expanded using a tube expander. This type of expander inserts a straight, rigid expansion rod into the heat exchanger's refrigerant tube. An expansion head is attached to the rod's head. When the head reaches the designated position, the rod is pulled back to its original position. During this time, the heat exchanger can be expanded using the expansion head, expanding the refrigerant tube. However, this type of expander occupies a large area, taking up considerable factory space, which is particularly noticeable when expanding large heat exchangers. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a heat exchanger tube expander that can reduce floor space.

[0004] According to an embodiment of the present invention, a heat exchanger tube expander comprises a base, a guide mechanism, a rod storage mechanism, a flexible rod, and an expansion rod drive mechanism. The guide mechanism is disposed on the base and is provided with a guide hole; the rod storage mechanism is disposed on the base and is provided with a spiral channel, one end of which is provided with a through-hole; the flexible rod is disposed through the guide hole and can move longitudinally and retract into or extend from the spiral channel through the through-hole; the end of the flexible rod remote from the rod storage mechanism is provided with an expansion head; and the expansion rod drive mechanism is disposed on the base and is used to drive the flexible rod to move longitudinally.

[0005] The heat exchanger tube expander according to the embodiment of the present invention has at least the following beneficial effects: when the heat exchanger tube is expanded, the guide hole of the guide mechanism is opposite to the tube mouth of the refrigerant tube of the heat exchanger, and first the expansion rod driving mechanism drives the flexible rod to continuously move out from the spiral channel of the storage rod mechanism, and makes the flexible rod move into the refrigerant tube through the guide hole, and when the tube expansion head reaches the specified position in the refrigerant tube, the expansion rod driving mechanism drives the flexible rod to retreat, during which the tube expansion head expands the refrigerant tube, and the flexible rod retracts along the spiral channel and is stored in a spirally wound manner. By using the spiral channel to spirally wind the flexible rod, the equipment's footprint can be reduced and site utilization efficiency can be improved.

[0006] According to some embodiments of the present invention, the rod storage mechanism includes a rod storage frame and a plurality of guide rollers arranged along a spiral line direction, the guide rollers are arranged on the rod storage frame, the central axis of the guide rollers is arranged along the front-to-back direction, and all the guide rollers form the spiral channel.

[0007] According to some embodiments of the present invention, the flexible rods are provided in plurality and are arranged at intervals along the front-to-back direction, and the rod storage rack is provided with at least two partition plates arranged at intervals along the front-to-back direction, and the partition plates divide the spiral channel into a plurality of spiral sub-channels, and the spiral sub-channels correspond to the flexible rods one by one.

[0008] According to some embodiments of the present invention, the guide roller is pivotally connected to the storage rod rack.

[0009] According to some embodiments of the present invention, all the guide rollers are evenly arranged along the direction of the spiral line.

[0010] According to some embodiments of the present invention, the guide hole is opposite to the through port along the hole axis direction.

[0011] According to some embodiments of the present invention, the expansion rod driving mechanism includes a driving wheel group and a rotation driver, the driving wheel group includes two driving wheels whose rotation axes are parallel to each other, the two driving wheels are arranged on opposite sides of the flexible rod, the two driving wheels clamp the outer periphery of the flexible rod, and the rotation driver is used to drive the two driving wheels to rotate in opposite directions, and the peripheral linear velocities of the two driving wheels are the same.

[0012] According to some embodiments of the present invention, the expansion rod driving mechanism also includes a driving base, a driving lifting frame and an elastic member, the driving base is arranged on the machine base, the driving lifting frame is slidably connected to the driving base along the up and down directions, the two driving wheels of the driving wheel group are respectively arranged on the driving base and the driving lifting frame, and the elastic member is arranged between the driving base and the driving lifting frame and is used to apply elastic force to make the two driving wheels of the driving wheel group clamp the flexible rod.

[0013] According to some embodiments of the present invention, the outer peripheral surface of the driving wheel is provided with a friction groove and a gear portion around its rotation axis, the gear portions of the two driving wheels are engaged with each other, the flexible rod abuts against the groove wall of the friction groove, and the rotation driver is used to drive one of the driving wheels of the driving wheel group to rotate.

[0014] According to some embodiments of the present invention, there are at least two driving wheel sets arranged along the length direction of the flexible rod.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 This is a three-dimensional schematic diagram of a heat exchanger tube expander according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic top view of a portion of the structure of a heat exchanger tube expander according to an embodiment of the present invention;

[0019] Figure 3 This is a rear view schematic diagram of a partial structure of a heat exchanger tube expander according to an embodiment of the present invention;

[0020] Figure 4 This is a cross-sectional schematic diagram of the expansion rod driving mechanism of an embodiment of the present utility model;

[0021] Figure 5 A three-dimensional schematic diagram of a base according to an embodiment of the present utility model;

[0022] Figure 6 This is a schematic diagram of a partial structure of a flexible rod according to an embodiment of the present utility model;

[0023] Figure 7 This is a schematic diagram of a partial structure of another flexible rod according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Machine base 100, base frame 110, lifting platform 120, traverse platform 130, installation platform 140;

[0026] Guide mechanism 200, guide hole 201, guide tube 210, straightening roller row 220, straightening roller 221;

[0027] Rod storage mechanism 300, spiral channel 301, passage 302, spiral sub-channel 303, rod storage rack 310, guide roller 320, partition plate 330;

[0028] Flexible rod 400, expansion head 410, expansion sleeve 411, inner core shaft 412, column spring 413;

[0029] Expansion rod driving mechanism 500, driving wheel assembly 510, driving wheel 511, friction groove 512, gear portion 513, rotation driver 520, driving base 530, driving lifting frame 540, elastic member 550;

[0030] The tube clamping mechanism 600 , the tube clamping sleeve 610 , and the tube clamping driver 620 . DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are 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 therefore cannot be understood as a limitation on the present invention.

[0033] In the description of this utility model, "a plurality" means more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Reference Figures 1 to 7 The heat exchanger tube expander according to an embodiment of the present invention includes a base 100, a guide mechanism 200, a rod storage mechanism 300, a flexible rod 400, and an expansion rod drive mechanism 500. The guide mechanism 200 is disposed on the base 100 and is provided with a guide hole 201. The rod storage mechanism 300 is disposed on the base 100 and is provided with a spiral channel 301, with a through-hole 302 at one end of the spiral channel 301. The flexible rod 400 is inserted into the guide hole 201 and can move longitudinally and retract into or extend out of the spiral channel 301 through the through-hole 302. The end of the flexible rod 400 away from the rod storage mechanism 300 is provided with an expansion head 410. The expansion rod drive mechanism 500 is disposed on the base 100 and is used to drive the flexible rod 400 to move longitudinally.

[0036] When the heat exchanger expands the tube, the guide hole 201 of the guide mechanism 200 is opposite to the tube mouth of the refrigerant tube of the heat exchanger. First, the expansion rod driving mechanism 500 drives the flexible rod 400 to continuously move out from the spiral channel 301 of the storage rod mechanism 300, and makes the flexible rod 400 move into the refrigerant tube through the guide hole 201. When the expansion head 410 reaches the specified position in the refrigerant tube, the expansion rod driving mechanism 500 drives the flexible rod 400 to retract. During this period, the expansion head 410 expands the refrigerant tube, and the flexible rod 400 retracts along the spiral channel 301 and is stored in a spirally wound manner. By using the spiral channel 301 to spirally wind the flexible rod 400, the equipment's footprint can be reduced and site utilization efficiency can be improved.

[0037] Reference Figure 6 and Figure 7 Specifically, the expansion head 410 can be of a fixed size, and the heat exchanger can be expanded during the insertion process, which is suitable for a push-expansion type expansion machine; it can be understood that the expansion head 410 can be expandable, and the heat exchanger can be expanded during the retraction process, that is, it is suitable for a pull-expansion type expansion machine.

[0038] In this embodiment, the rod storage mechanism 300 includes a rod storage frame 310 and a plurality of guide rollers 320 arranged in a spiral direction. The guide rollers 320 are disposed on the rod storage frame 310, with the central axes of the guide rollers 320 arranged in the front-to-back direction. All of the guide rollers 320 form a spiral channel 301. The formation of the spiral channel 301 by the plurality of guide rollers 320 arranged in a spiral direction can reduce the overall contact area between the flexible rod 400 and the guide rollers 320, thereby reducing the friction between the flexible rod 400 and the rod storage mechanism 300, allowing the flexible rod 400 to move relatively smoothly along the spiral channel 301.

[0039] It is conceivable that in other embodiments, the spiral channel 301 may be formed by a plate extending along the spiral line, which can also guide the flexible rod 400 to spirally retract when it retracts, so as to save space occupied by the equipment.

[0040] In this embodiment, a plurality of flexible rods 400 are provided and arranged at intervals along the front-to-back direction. The rod storage rack 310 is provided with at least two partition plates 330 arranged at intervals along the front-to-back direction. The partition plates 330 divide the spiral channel 301 into a plurality of spiral sub-channels 303, and the spiral sub-channels 303 correspond one to one with the flexible rods 400. By dividing the spiral channel 301 into a plurality of spiral sub-channels 303 by the plurality of partition plates 330 arranged sequentially at intervals along the front-to-back direction, each flexible rod 400 can be independently spirally wound in a spiral sub-channel 303, thereby preventing interference between different flexible rods 400 and facilitating smoother extension and retraction of the flexible rods 400 relative to the spiral channels 301.

[0041] It should be understood that when three flexible rods 400 are provided, three spiral sub-channels 303 are provided, and the spiral channel 301 can be separated and formed by two partition plates 330; when four flexible rods 400 are provided, four spiral sub-channels 303 are provided, and the spiral channel 301 can be separated and formed by three partition plates 330; further, when N flexible rods 400 are provided, N spiral sub-channels 303 are provided, and the spiral channel 301 can be separated and formed by N-1 partition plates 330.

[0042] Specifically, the flexible rod 400 can be a rod with a certain elasticity, such as a rod made of an alloy such as spring steel; or a non-metallic rod, such as a plastic rod with a certain elasticity; or a rod with a certain plasticity, as long as it can be deformed, straightened, and deformed and coiled, and has a certain toughness.

[0043] In an embodiment, the guide roller 320 is pivotally connected to the storage rod frame 310, so that when the guide roller 320 contacts the flexible rod 400, there is rolling friction between the guide roller 320 and the flexible rod 400, which further reduces the friction force exerted on the flexible rod 400 when it moves, thereby facilitating the smooth movement of the flexible rod 400 and reducing the degree of wear of the flexible rod 400 after long-term use.

[0044] It is conceivable that in other implementations, the guide roller 320 may also be fixedly connected to the storage rod rack 310, and those skilled in the art may configure it specifically according to actual needs.

[0045] In the embodiment, all the guide rollers 320 are evenly arranged along the spiral line direction, so that the flexible rod 400 moves more smoothly along the spiral channel 301 and has a better use effect.

[0046] In the embodiment, the guide hole 201 is opposite to the through hole 302 along its hole axis, so that the flexible rod 400 retracted from the through hole 302 can pass through the guide hole 201 more smoothly after being straightened, which is relatively convenient to use.

[0047] In an embodiment, the expansion rod driving mechanism 500 includes a driving wheel group 510 and a rotation driver 520. The driving wheel group 510 includes two driving wheels 511 whose rotation axes are parallel to each other. The two driving wheels 511 are arranged on opposite sides of the flexible rod 400. The two driving wheels 511 clamp the outer periphery of the flexible rod 400. The rotation driver 520 is used to drive the two driving wheels 511 to rotate in opposite directions, and the peripheral linear velocities of the two driving wheels 511 are the same.

[0048] The two driving wheels 511 are driven to rotate by the rotating driver 520, and the outer periphery of the two driving wheels 511 clamps the outer periphery of the flexible rod 400 at the same peripheral linear speed, so that the flexible rod 400 can move along its length direction to extend and retract in the spiral channel 301, and insert or remove the refrigerant pipe of the heat exchanger. The structure is simple and the movement effect of the flexible rod 400 is relatively smooth.

[0049] In an embodiment, the expansion rod driving mechanism 500 also includes a driving base 530, a driving lifting frame 540 and an elastic member 550. The driving base 530 is arranged on the machine base 100, and the driving lifting frame 540 is connected to the driving base 530 in a sliding manner in the up and down directions. The two driving wheels 511 of the driving wheel group 510 are respectively arranged on the driving base 530 and the driving lifting frame 540. The elastic member 550 is arranged between the driving base 530 and the driving lifting frame 540 and is used to apply elastic force to make the two driving wheels 511 of the driving wheel group 510 clamp the flexible rod 400.

[0050] Specifically, the drive base 530 is provided with a slide groove along the vertical direction, and the drive lift 540 is provided with a slider that is slidably connected to the slide groove, allowing the drive lift 540 to slide in the vertical direction. The elastic member 550 is a gas spring that drives the two drive wheels 511 toward each other to clamp the flexible rod 400. It is conceivable that in other embodiments, the drive base 530 and the drive lift 540 can also achieve vertical sliding through a guide column and guide sleeve structure. The elastic member 550 can also be a spring, spring, or elastic block. Those skilled in the art can configure it according to actual needs.

[0051] In the embodiment, a friction groove 512 and a gear portion 513 are provided on the outer circumference of the drive wheel 511 around its rotation axis. The gear portions 513 of the two drive wheels 511 mesh with each other, and the flexible rod 400 abuts against the groove wall of the friction groove 512. The rotation driver 520 is used to drive one of the drive wheels 511 of the drive wheel assembly 510 to rotate. When the rotation driver 520 drives one of the drive wheels 511 of a drive wheel assembly 510 to rotate, the two drive wheels 511 mesh with each other via the gear portion 513, allowing the two drive wheels 511 in the same drive wheel assembly 510 to rotate in opposite directions at the same peripheral linear velocity. This eliminates the need to synchronously drive the two drive wheels 511 in the same drive wheel assembly 510 in opposite directions, simplifying the device structure and avoiding abnormal situations caused by different linear velocities of the two drive wheels 511.

[0052] In an embodiment, at least two driving wheel assemblies 510 are provided and arranged along the length direction of the flexible rod 400, so that the expansion rod driving mechanism 500 provides sufficient friction driving force to the flexible rod 400, with a simple structure and easy implementation.

[0053] Specifically, all the driving wheel sets 510 clamping the same flexible rod 400 are arranged along the axis of the guide hole 201, so that the driving wheel sets 510 can not only drive the flexible rod 400 to move, but also play a certain straightening role on the flexible rod 400.

[0054] Specifically, each flexible rod 400 corresponds to four drive wheel sets 510. It is conceivable that in other embodiments, each flexible rod 400 may correspond to two, three or more drive wheel sets 510, and those skilled in the art may configure the drive wheel sets 510 according to actual needs.

[0055] In the embodiment, the rotation driver 520 is a reduction motor that drives all the drive wheels 511 to rotate by means of gear rotation. It is conceivable that in other embodiments, the rotation driver 520 can also be a structure that outputs rotational power, such as an internal combustion engine, and those skilled in the art can configure it according to actual needs.

[0056] It is conceivable that the expansion rod driving mechanism 500 can also be other structures. For example, the expansion rod driving mechanism 500 adopts a linear drive and a clamp. When the clamp clamps the flexible rod 400, the clamp can be driven to move by the linear drive, so that the flexible rod 400 moves along the length direction. Then the clamp releases the flexible rod 400 and resets it through the linear drive. Repeating the above actions makes the flexible rod 400 continue to move.

[0057] Specifically, the guide mechanism 200 includes a guide tube 210, and the guide tube 210 forms a guide hole 201. The guide hole 201 is provided along the left-right direction.

[0058] Specifically, the device further includes a tube clamping mechanism 600, which includes a tube clamping sleeve 610 and a tube clamping driver 620. The right end of the guide tube 210 has multiple elastic arms arranged around the axis of the hole. The tube clamping sleeve 610 is sleeved around the outer circumference of the guide tube 210. The tube clamping driver 620 can drive the tube clamping sleeve 610 to move rightward and push all the elastic arms together, and can also drive the tube clamping sleeve 610 to move leftward to allow the elastic arms to expand. When the tube clamping sleeve 610 moves rightward, the elastic arms can clamp and fix the tube opening of the refrigerant tube, facilitating the insertion or withdrawal of the flexible rod 400 from the refrigerant tube. When the tube clamping sleeve 610 moves leftward, it can release the refrigerant tube.

[0059] Specifically, the tube clamping driver 620 is a pneumatic cylinder. It is conceivable that in other embodiments, the tube clamping driver 620 can also be a structure such as an electric cylinder or an oil cylinder.

[0060] In this embodiment, the guide mechanism 200 further includes two straightening roller rows 220, each of which includes a plurality of straightening rollers 221 arranged in a left-right direction. The two straightening roller rows 220 are parallel to each other, and a straightening channel is formed between the two straightening roller rows 220. The straightening channel facilitates straightening of the flexible rod 400 after extending from the spiral channel 301, facilitating insertion of the flexible rod 400 into the refrigerant pipe of the heat exchanger.

[0061] Specifically, the straightening roller 221 is pivotally connected to the rod storage frame 310 , and the straightening roller row 220 is located between the expansion rod driving mechanism 500 and the through opening 302 of the spiral channel 301 .

[0062] It is conceivable that the guide mechanism 200 may also be a block having the same number of guide holes 201 as the number of flexible rods 400 .

[0063] Specifically, the machine base 100 includes a base frame 110, a lifting platform 120, a traversing platform 130, and a mounting platform 140. The guide mechanism 200, rod storage mechanism 300, flexible rod 400, and expansion rod drive mechanism 500 are all mounted on the mounting platform 140. The mounting platform 140 is connected to the traversing platform 130 in a left-right sliding direction via a slide rail and slider structure, and can be driven to slide left and right by a linear actuator. The traversing platform 130 is connected to the lifting platform 120 in a front-to-back sliding direction via a slide rail and slider structure. The lifting platform 120 is raised and lowered by studs and screw sleeves arranged in the vertical direction. The screw sleeves are driven by a reduction motor to rotate, thereby driving the lifting platform 120 up and down.

[0064] Specifically, the heat exchanger tube expander of this embodiment may also be equipped with an expansion mechanism to expand the heat exchanger after expansion.

[0065] Specifically, the expandable expansion head 410 is suitable for use in a tensile expansion type tube expander and includes an expansion sleeve 411, an inner core shaft 412, and a column spring 413. One end of the inner core shaft 412 is connected to the flexible rod 400, and the other end of the inner core shaft 412 has a tapered section. The expansion sleeve 411 is sleeved on the inner core shaft 412. The end of the expansion sleeve 411 near the tapered section has multiple elastic cantilevers, which are arranged around the inner core shaft 412. One end of the column spring 413 is connected to the flexible rod 400, and the other end is connected to the expansion sleeve 411. During insertion, the column spring 413 is in a compressed state, or a small amount of friction between the expansion sleeve 411 and the inner hole of the refrigerant tube prevents all the elastic cantilevers from being pushed open by the tapered section. At this time, the outer diameter of the expansion sleeve 411 is no larger than the inner diameter of the refrigerant tube, and the expansion sleeve 411 can be inserted into the refrigerant tube. When the flexible rod 400 is inserted into place, the flexible rod 400 is pulled back. At this time, the column spring 413 relaxes and drives all the elastic cantilevers of the expansion sleeve 411 to contact the tapered section, or when pulling back, a small amount of friction between the expansion sleeve 411 and the refrigerant tube causes the elastic cantilever to contact the tapered section, and then is pushed by the tapered section, causing the elastic cantilevers to open to each other, thereby increasing the outer diameter of the expansion sleeve 411 and realizing tube expansion when pulling back.

[0066] It is conceivable that in other embodiments, the expansion head 410 may also adopt the expansion head 410 of the existing tensile expansion rod expansion machine on the market, and the expansion head 410 may also expand during the pulling back process to increase the outer diameter.

[0067] Specifically, the heat exchanger tube expander of the present invention is particularly suitable for the tube expansion process of large heat exchangers. It is understandable that small-sized heat exchangers can also use the heat exchanger tube expander of this embodiment.

[0068] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0069] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat exchanger tube expander, characterized in that: include: Machine base (100); A guide mechanism (200) is provided on the machine base (100), and the guide mechanism (200) is provided with a guide hole (201); A rod storage mechanism (300) is provided on the machine base (100), the rod storage mechanism (300) is provided with a spiral channel (301), and one end of the spiral channel (301) is provided with a through port (302); A flexible rod (400) is inserted into the guide hole (201), and the flexible rod (400) can move along the length direction and retract into or extend out of the spiral channel (301) through the through opening (302). An expansion head (410) is provided at one end of the flexible rod (400) away from the rod storage mechanism (300); An expansion rod driving mechanism (500) is provided on the machine base (100) and is used to drive the flexible rod (400) to move along the length direction.

2. The heat exchanger tube expander according to claim 1, characterized in that: The rod storage mechanism (300) comprises a rod storage frame (310) and a plurality of guide rollers (320) arranged along a spiral line direction. The guide rollers (320) are arranged on the rod storage frame (310). The central axes of the guide rollers (320) are arranged along a front-to-back direction. All the guide rollers (320) form the spiral channel (301).

3. The heat exchanger tube expander according to claim 2, characterized in that: The flexible rods (400) are provided in plurality and are arranged at intervals along the front-to-back direction. The rod storage rack (310) is provided with at least two partition plates (330) arranged at intervals along the front-to-back direction. The partition plates (330) divide the spiral channel (301) into a plurality of spiral sub-channels (303). The spiral sub-channels (303) correspond one to one with the flexible rods (400).

4. The heat exchanger tube expander according to claim 2, characterized in that: The guide roller (320) is pivotally connected to the rod storage rack (310).

5. The heat exchanger tube expander according to claim 2, characterized in that: All the guide rollers (320) are evenly arranged along the spiral direction.

6. The heat exchanger tube expander according to claim 1, characterized in that: The guide hole (201) is opposite to the through port (302) along the hole axis direction.

7. The heat exchanger tube expander according to claim 1, characterized in that: The expansion rod driving mechanism (500) includes a driving wheel group (510) and a rotation driver (520). The driving wheel group (510) includes two driving wheels (511) whose rotation axes are parallel to each other. The two driving wheels (511) are respectively arranged on opposite sides of the flexible rod (400). The two driving wheels (511) clamp the outer periphery of the flexible rod (400). The rotation driver (520) is used to drive the two driving wheels (511) to rotate in opposite directions. The outer periphery linear velocities of the two driving wheels (511) are the same.

8. The heat exchanger tube expander according to claim 7, characterized in that: The expansion rod driving mechanism (500) further comprises a driving base (530), a driving lifting frame (540) and an elastic member (550); the driving base (530) is arranged on the machine base (100); the driving lifting frame (540) is slidably connected to the driving base (530) in an up-down direction; the two driving wheels (511) of the driving wheel group (510) are respectively arranged on the driving base (530) and the driving lifting frame (540); the elastic member (550) is arranged between the driving base (530) and the driving lifting frame (540) and is used to apply elastic force to enable the two driving wheels (511) of the driving wheel group (510) to clamp the flexible rod (400).

9. The heat exchanger tube expander according to claim 7, characterized in that: The outer circumference of the driving wheel (511) is provided with a friction groove (512) and a gear portion (513) around its rotation axis. The gear portions (513) of the two driving wheels (511) are meshed with each other. The flexible rod (400) abuts against the groove wall of the friction groove (512). The rotation driver (520) is used to drive one of the driving wheels (511) of the driving wheel group (510) to rotate.

10. The heat exchanger tube expander according to claim 7, characterized in that: At least two driving wheel assemblies (510) are provided and arranged along the length direction of the flexible rod (400).

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