Pipe expanding type radiator end face reaming device

Abstract

This application discloses a device for expanding the end hole of an expansion tube radiator, relating to the field of metal tube plastic forming technology. It includes a machine base, a fixing device, two sets of expansion tube structures, and a coupling mechanism. The machine base has a working area, and the fixing device is used to fix the expansion tube radiator in the working area. Both sets of expansion tube structures have radially expandable expansion sections, which are movably mounted on the machine base and located on opposite sides of the working area. The two sets of expansion tube sections can move away from and towards each other in a straight line. The coupling mechanism is drivenly connected to the expansion tube sections so that during the insertion of the expansion tube sections into the radiator tube opening, they can be driven to a preset expansion size, and during the withdrawal of the expansion tube sections from the radiator tube opening, their size can be driven to shrink. The expansion tube structure in this application can maintain the required working size during hole expansion to ensure forming quality, and actively shrinks the radial dimension after completion to achieve a low-resistance exit, thereby protecting the tube end structure.

Description

Technical Field

[0001] This invention relates to the field of metal tube plastic forming technology, and in particular to a device for expanding the end hole of an expansion tube radiator. Background Technology

[0002] Expanded tube heat sinks are typically composed of multiple heat pipes and fins joined together through an expansion process. To ensure the overall structural reliability and sealing of the heat sink, the ends of the heat pipes need to be enlarged during the manufacturing process. This process plastically deforms the pipe ends and enlarges the hole diameter, allowing for an interference fit with the heat pipe mounting holes on the motherboard during subsequent assembly.

[0003] In existing technologies, after reaming, the expanded tube section is typically removed from the tube hole using a rigid pulling method. This processing device generally includes a fixed fixture and a linear drive mechanism, which is rigidly connected to the expanded tube section via a pull rod or clamp. During operation, the drive mechanism applies a single pulling force along the axis of the heat dissipation tube, thereby forcibly pulling the expanded tube section from the reamed end of the tube.

[0004] However, due to deviations in processing precision, the inhomogeneity of the tubing itself, or microscopic differences arising during the bulging process, the tightness of the fit between the inner walls of the two ends of the heatsink and the expanded section is often inconsistent, resulting in different pull-out forces required on both sides. Existing rigid connections and single-force application methods cannot adaptively adjust the pull-out force, causing uneven stress on both ends of the heatsink during processing. This stress unevenness can easily lead to localized plastic deformation and microcracks in the heatsink, or cause distortion of the formed bulge shape, ultimately damaging the structural integrity and lifespan of the heatsink, and reducing the connection quality and sealing reliability between the heatsink and the motherboard. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a tube-expanding radiator end hole enlargement processing device. By designing an adjustable tube expansion structure, the device can maintain the required working size during hole enlargement to ensure forming quality, and actively reduce the radial dimension after completion to achieve a low-resistance exit state, thereby effectively protecting the tube end structure and improving processing reliability.

[0006] According to an embodiment of the present invention, an end-hole enlarging device for an expansion tube type radiator includes a machine base, a fixing device, two sets of expansion tube structures, and a coupling mechanism. The machine base has a working area, and the fixing device is used to fix the expansion tube type radiator in the working area. Both sets of expansion tube structures are provided with radially expandable expansion tube portions. Both sets of expansion tube portions are movably disposed on the machine base and are located on opposite sides of the working area. The two sets of expansion tube portions can move away from and closer to each other in a straight line. The coupling mechanism is drivenly connected to the expansion tube portions so that during the process of the expansion tube portion being inserted into the opening of the radiator tube, the expansion tube portion can be driven to a preset expansion size, and during the process of the expansion tube portion being withdrawn from the opening of the radiator tube, the size of the expansion tube portion can be driven to shrink.

[0007] Furthermore, the expansion tube structure includes an extension tube, multiple segmented block push rods, and a push rod. The extension tube is movably mounted on the machine base, and a sliding cavity is provided inside the extension tube. The multiple segmented blocks are slidably connected to one end of the extension tube and surround it to form the expansion tube portion. The segmented blocks are also elastically connected to the extension tube. Under the action of elastic force, each segmented block can contract radially. The push rod is slidably disposed in the sliding cavity and can simultaneously engage with each segmented block at an oblique wedge to push each segmented block to expand radially to the preset expansion size. The coupling mechanism is drivenly connected to the push rod to drive the push rod to move to one side of the extension tube and establish an oblique wedge engagement with each segmented block, and to drive the push rod to move to the other side of the extension tube and release the oblique wedge engagement between the push rod and each segmented block.

[0008] Furthermore, the tube expansion structure also includes a movable seat, a bidirectional lead screw, and a rotary driver. The bidirectional lead screw is rotatably mounted on the machine base. The movable seat is threadedly connected to the bidirectional lead screw, and the rotary driver is drively connected to the bidirectional lead screw to drive the bidirectional lead screw to rotate.

[0009] Furthermore, after the segmented blocks are assembled, a conical cavity with one end open is formed inside, and the other end of the conical cavity is connected to a cylindrical cavity. The end of the push rod is provided with a conical head that matches the conical cavity.

[0010] Furthermore, the end of the push rod away from the dividing block is provided with an opening groove, and the push rod is elastically connected to the sliding cavity to prevent the push rod from moving away from the working area; the coupling mechanism includes a limiting seat and a reverse push block. The limiting seat is located in the opening groove and is fixed to the extension tube by a fixing member. The limiting seat is provided with a slot. The push rod is provided with a locking block that cooperates with the slot. The reverse push block is slidably disposed on the moving seat to slide along the moving direction of the push rod. The reverse push block is unidirectionally connected to the bidirectional lead screw. When the bidirectional lead screw drives the moving seat away from the working area, the bidirectional lead screw drives the reverse push block to move away from the working area, and the moving seat is elastically connected to the reverse push block to prevent the reverse push block from moving away from the working area.

[0011] Furthermore, the coupling mechanism also includes a first spring and a telescopic tube. The two ends of the telescopic tube are respectively connected to the reverse push block and the push rod. The first spring is sleeved on the telescopic tube, and the two ends of the first spring are respectively connected to the first stage tube and the last stage tube of the telescopic tube.

[0012] Furthermore, the coupling mechanism also includes a second spring, the two ends of which are respectively connected to the reverse push block and the movable seat.

[0013] Furthermore, the extension tube is provided with a groove along its axial direction that communicates with the sliding cavity, and the coupling mechanism also includes a push rod, one end of which is connected to the fixing device, and the other end of which passes through the groove, the opening groove and the limiting seat in sequence and is connected to the pressing block.

[0014] Furthermore, the movable seat is provided with a transmission chamber, which is connected to the sliding cavity through a limiting groove. The reverse push block is slidably limited within the limiting groove, and the two ends of the first spring are respectively connected to the outer peripheral wall of the push rod and the end of the reverse push block that extends into the sliding cavity. The two ends of the second spring are respectively connected to the inner side wall of the transmission chamber and the end of the reverse push block that extends into the transmission chamber.

[0015] Furthermore, the transmission chamber is provided with an overrunning clutch, the outer ring of the overrunning clutch is provided with a rotating plate, the rotating plate is provided with an arc-shaped groove, and one end of the reverse push block extending into the transmission chamber passes through the arc-shaped groove; wherein, when the rotating plate rotates around the central axis of the overrunning clutch, it drives the reverse push block to slide within the limiting groove through the arc-shaped groove.

[0016] Furthermore, a worm gear is rotatably mounted on the machine base, the worm gear is parallel to the bidirectional lead screw, and the worm gear is connected to the rotary drive. A turbine gear that meshes with the worm gear is rotatably mounted on the moving seat, and the turbine gear is connected to the inner ring of the overrunning clutch through a transmission component.

[0017] The tube expansion radiator end hole enlargement processing device according to an embodiment of the present invention has at least the following beneficial effects: by providing radially expandable tube expansion parts on both sides of the heat sink tube and a coupling mechanism therewith, the preset expansion size can be stably maintained when the tube is inserted for enlargement, thereby ensuring the dimensional accuracy and shape consistency of the enlargement processing. In the process of withdrawing the tube after the enlargement operation is completed, its radial size can be actively reduced to reduce the withdrawal resistance. Compared with the traditional rigid pulling withdrawal method, it can effectively avoid stress concentration caused by forced pulling and the tube deformation or cracking problems caused thereby. To a certain extent, it can improve the protection effect of the heat sink tube structure during the processing.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the end hole enlarging device for an expansion tube type radiator according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the assembly structure of the push rod and the extension tube in one embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the push rod and the reverse push block in one embodiment of the present invention; Figure 4 This is a schematic diagram of the push rod away from the conical head in one embodiment of the present invention; Figure 5 This is a schematic diagram of the assembly structure between the bidirectional lead screw, worm gear, turbine, gear train transmission mechanism and rotary actuator in one embodiment of the present invention; Figure label: Machine base 100, working area 110, worm gear 120, fixing device 200, extension tube 210, sliding cavity 211, dividing block 220, conical cavity 221, cylindrical cavity 222, push rod 230, conical head 231, opening slot 232, locking block 233, elastic element 240, moving seat 250, limiting through slot 251, turbine 252, double-acting screw 260, rotary driver 270, limiting locking seat 410, locking slot 411, reverse push block 420, first spring 430, telescopic tube 440, second spring 450, overrunning clutch 500, rotating plate 510, arc groove 511, gear transmission mechanism 600; The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] Reference Figures 1 to 5 The present invention provides an end-hole expansion processing device for a tube-type radiator, comprising a machine base 100, a fixing device 200, two sets of tube expansion structures, and a coupling mechanism.

[0025] Specifically, the machine base 100 constitutes the main support structure of the hole-expanding processing device, and a working area 110 is provided on it. When installing the tube-expanding radiator, the tube-expanding radiator is fixed in the working area 110 by the fixing device 200. It should be noted that there are many ways to arrange the tube-expanding radiator, such as horizontal or vertical placement, and the specific structure of the fixing device 200 needs to be selected according to the arrangement of the tube-expanding radiator.

[0026] For example, Appendix Figure 1When the expansion tube radiator is arranged horizontally, two opposing support seats can be set on the surface of the machine tool 100. The two support seats fix the front and rear ends of the expansion tube radiator respectively, while the area to be processed is the left and right ends of the expansion tube radiator. The fixing device 200 can be a telescopic cylinder with a guide rod. During operation, the telescopic cylinder pushes the extrusion plate downward to press the upper surface of the expansion tube radiator, so that the expansion tube radiator maintains its position during the hole expansion process. After the hole expansion is completed, the telescopic cylinder pushes the extrusion plate to separate from the expansion tube radiator.

[0027] It is understood that other devices may be used for fixing device 200, and fixing device 200 falls within the scope of prior art and is not the main innovation of this application, so it will not be elaborated here.

[0028] Both sets of expansion tube structures are equipped with radially expandable expansion tube sections. Both sets of expansion tube sections are movably mounted on the machine base 100 and are located on opposite sides of the working area 110. During operation, the two sets of expansion tube sections can move away from each other and move closer together in a straight line. When they move closer together, the two sets of expansion tube sections expand the holes from both ends of the expansion tube radiator. When they move away from each other, the two sets of expansion tube sections gradually withdraw from the expansion tube radiator.

[0029] The coupling mechanism is connected to the expansion tube section via a drive mechanism. When the expansion tube section moves towards the heat sink nozzle and is inserted, the coupling mechanism acts on the expansion tube section, causing it to expand radially to a preset size, which is the desired target size for the expanded opening. This allows for stable and uniform plastic expansion of the nozzle opening. Conversely, when the expansion tube section needs to withdraw from the nozzle opening, the coupling mechanism acts on it again, causing it to contract radially, making its outer diameter smaller than the inner diameter of the expanded opening. This reduces friction and interference between the expansion tube section and the tube wall, achieving near-resistance-free withdrawal.

[0030] In some alternative embodiments, such as Figure 2 As shown, the expansion tube structure includes an extension tube 210, multiple segmented blocks 220, and a push rod 230.

[0031] Specifically, the extension tube 210 is movably mounted on the machine base 100, allowing it to move horizontally along the axial direction of the heat dissipation tube. Multiple segmented blocks 220 are slidably connected to one end of the extension tube 210 near the working area 110. These segmented blocks 220 are circumferentially evenly arranged and together form a radially retractable expansion section. Optionally, the segmented blocks 220 and the extension tube 210 can be slidably connected via a sliding block and rail mechanism.

[0032] Meanwhile, in order to prevent the dividing block 220 from sliding off the extension tube 210, a limiting mechanism can be set on the mating structure of the slider and slide rail. For example, a protrusion can be set on the slide rail and an abutment groove can be set on the slider. When the dividing block 220 moves radially outward to the position corresponding to the target size of the enlarged hole, or when the dividing block 220 moves radially inward to the corresponding position, the protrusion abuts against the abutment groove. At this time, the dividing block 220 will not continue to move outward due to inertia.

[0033] The segmented blocks 220 are also elastically connected to the extension tube 210 via elastic elements 240. Under the preload of the elastic elements 240, each segmented block 220 tends to contract inward, so that the expansion tube section maintains a small outer diameter in its natural state. Optionally, the elastic elements 240 can be springs, elastic sheets, or other similar components.

[0034] To drive each segment 220 to expand radially, a sliding cavity 211 is provided inside the extension tube 210, and a push rod 230 is slidably disposed within the sliding cavity 211. The coupling mechanism is connected to the push rod 230 in a transmission manner. When the coupling mechanism drives the push rod 230 to move towards the side of the extension tube 210 closer to the working area 110, the push rod 230 can simultaneously engage with each segment 220 at an oblique wedge, thereby enabling the push rod 230 to push each segment 220 to expand radially to the position corresponding to the preset expansion size. When the coupling mechanism drives the push rod 230 to move in the opposite direction, the push rod 230 can simultaneously disengage from the oblique wedge engagement with each segment 220, and under the preload of the elastic element 240, each segment 220 contracts inward.

[0035] In some alternative embodiments, such as Figure 1 , Figure 3 , Figure 5 As shown, the tube expansion structure also includes a movable seat 250, a bidirectional lead screw 260, and a rotary driver 270. The two movable seats 250 are respectively fixedly connected to the extension tubes 210 in the two sets of tube expansion structures in the aforementioned embodiments. At the same time, in order to move the extension tubes 210, the two movable seats 250 can move on the machine base 100.

[0036] Specifically, the bidirectional lead screw 260 is rotatably mounted on the machine base 100. Two precision threaded sections with opposite directions are machined on the body of the bidirectional lead screw 260. Two moving seats 250 are respectively threadedly connected to the two threaded sections of the bidirectional lead screw 260. The rotary drive 270 is connected to the bidirectional lead screw 260 for transmission.

[0037] During operation, the rotary driver 270 is activated, and the driving force generated by the rotary driver 270 can drive the bidirectional lead screw 260 to rotate around its axis. Since the two threaded sections rotate in opposite directions, the two threaded moving seats 250 will move synchronously towards or away from each other along the axial direction of the bidirectional lead screw 260, thereby driving the two expansion tube sections to achieve linear feed and retraction that move away from or towards each other.

[0038] Understandably, in order to prevent the double-acting screw 260 from jamming during operation, it should be maintained regularly, such as by applying grease.

[0039] In this embodiment, the rotary driver 270 can be a servo motor, stepper motor or other device, and the motor can be connected to one end of the bidirectional lead screw 260 through a coupling, reducer or other transmission components.

[0040] In some alternative embodiments, such as Figure 2 As shown, after the segmented blocks 220 are assembled, a conical cavity 221 with an opening at the left end is formed inside. Correspondingly, a conical head 231 matching the conical cavity 221 is provided at the right end of the push rod 230. (See attached diagram) Figure 1 In the indicated reference direction, as the conical head 231 moves to the right, when the inclined surface of the conical head 231 begins to contact the inclined surface of the conical cavity 221, the conical head 231 pushes each segmented block 220 to move radially outward; when the inclined surface of the conical head 231 no longer contacts the inclined surface of the conical cavity 221, the segmented block 220 no longer moves radially outward and remains at the preset expansion size. Conversely, during the reverse movement of the push rod 230, each segmented block 220 moves radially inward under the action of elastic force until it reaches the position corresponding to the set initial outer diameter.

[0041] In some alternative embodiments, such as Figure 2 As shown, to prevent excessive stress when the segmented blocks 220 contact the push rod 230, a cylindrical cavity 222 interconnected with each other can be provided at the right end of the conical cavity 221. During the movement of the conical head 231 to the right, when the inclined surface of the conical head 231 no longer contacts the inclined surface of the conical cavity 221, the push rod 230 can fully contact the inner wall of the conical cavity 221. This disperses the reverse thrust generated by the heat dissipation pipe during the hole enlargement operation with a larger contact area, thus protecting the structural integrity of the push rod 230 and the segmented blocks 220 to a certain extent. Simultaneously, since the push rod 230 is in perpendicular contact with the conical cavity 221 at this time, no oblique component force is generated, preventing the push rod 230 from moving axially. This ensures that the push rod 230 remains relatively fixed during hole enlargement, thereby ensuring that the expansion section maintains the preset expansion size and guaranteeing the hole enlargement accuracy.

[0042] In some alternative embodiments, such as Figure 4As shown, the end of the push rod 230 away from the dividing block 220 is provided with an opening slot 232, so that an external device or mechanism can extend into the opening slot 232 from the outside of the push rod 230 along its axial direction. At the same time, the push rod 230 is also elastically connected to the sliding cavity 211. When the elastic connection generates an elastic force, the elastic force can prevent the push rod 230 from moving away from the working area 110.

[0043] In some alternative embodiments, such as Figure 3 , Figure 4 As shown, the coupling mechanism includes a limiting seat 410 and a reverse push block 420.

[0044] Specifically, the limiting holder 410 is located within the opening slot 232 and is fixed to the extension tube 210 by a fastener. For example, as shown... Figure 1 As shown, the fixing component is a column. One end of the column extends into the opening groove 232 and is connected to the limiting seat 410. The other end of the column extends out of the opening groove 232 and is connected to the inner wall of the sliding cavity 211.

[0045] The limiting seat 410 is provided with a slot 411, and the push rod 230 is provided with a locking block 233 that cooperates with the slot 411. In order to facilitate the locking block 233 to be engaged in the slot 411, it is preferable to set one end of the slot 411 open. Under the action of the elastic force generated by the elastic connection between the push rod 230 and the sliding cavity 211, the locking block 233 can be tightly abutted against the bottom of the slot 411.

[0046] The reverse push block 420 is slidably mounted on the movable seat 250. When force is applied to the reverse push block 420, it can slide along the moving direction of the push rod 230. The reverse push block 420 is unidirectionally connected to the bidirectional lead screw 260. When the bidirectional lead screw 260 drives the movable seat 250 away from the working area 110, the bidirectional lead screw 260 drives the reverse push block 420 to move away from the working area 110. When the bidirectional lead screw 260 drives the movable seat 250 closer to the working area 110, the bidirectional lead screw 260 rotates in the opposite direction, but the driving force generated by the reverse rotation is not transmitted to the reverse push block 420.

[0047] Simultaneously, the movable seat 250 is elastically connected to the reverse push block 420. When this elastic connection generates an elastic force, the elastic force can prevent the reverse push block 420 from moving away from the working area 110. Due to the elastic connection between the push rod 230 and the slide cavity 211, in the attached... Figure 1 In the reference direction shown, in order for the elastic force generated by the elastic connection between the push rod 230 and the slide cavity 211 to push the push rod 230 to move stably to the right, it is necessary for the left end of the push rod 230 to remain relatively fixed when subjected to the reverse force of the elastic force. The aforementioned reverse force can be counteracted by the elastic connection between the moving seat 250 and the reverse push block 420.

[0048] In some alternative embodiments, such as Figure 3 As shown, the coupling mechanism also includes a first spring 430 and a telescopic tube 440. The telescopic tube 440 has at least two nested tubes. The two ends of the telescopic tube 440 are respectively fixedly connected to the outer peripheral walls of the reverse push block 420 and the push rod 230. The first spring 430 is sleeved on the telescopic tube 440, and the two ends of the first spring 430 are respectively connected to the first stage tube and the last stage tube of the telescopic tube 440.

[0049] In this embodiment, when the position of the reverse push block 420 remains relatively stable, under the preload of the first spring 430, the push rod 230 maintains a wedge-fit relationship with each segment block 220, so that the expansion tube is kept at a preset expansion size.

[0050] In some alternative embodiments, such as Figure 3 As shown, the coupling mechanism also includes a second spring 450, with the two ends of the second spring 450 fixedly connected to the reverse push block 420 and the movable seat 250, respectively.

[0051] In this embodiment, the preload of the second spring 450 overcomes the reverse force of the first spring 430, keeping the position of the reverse push block 420 relatively stable. If the push rod 230 moves, the telescopic tube 440 can extend or retract. The rigid guide generated by the telescopic tube 440 ensures that the first spring 430 always extends or retracts axially, avoiding changes in the direction of the elastic force, energy loss, fatigue, and interference wear with surrounding components caused by lateral displacement. This improves the linearity, accuracy, and long-term reliability of the entire force transmission chain, making the action control of the coupling mechanism more precise, stable, and durable. Simultaneously, when the bidirectional lead screw 260 drives the reverse push block 420 to move, the second spring 450 generates a force that prevents the reverse push block 420 from moving.

[0052] In some alternative embodiments, such as Figure 3As shown, the movable seat 250 is provided with a transmission chamber, which is connected to the sliding cavity 211 through a limiting groove 251. The reverse push block 420 is slidably limited within the limiting groove 251, and one end of the reverse push block 420 extends into the sliding cavity 211. The two ends of the telescopic tube 440 are respectively fixedly connected to the outer peripheral wall of the push rod 230 and the end of the reverse push block 420 that extends into the sliding cavity 211. During the process of the bidirectional lead screw 260 driving the movable seat 250 to approach the working area 110, the first spring 430 is in a compressed state. The elastic force generated by the first spring 430 pushes the locking block 233 on the push rod 230 to lock into the bottom of the locking groove 411. Since the locking block 233 is always locked in the locking groove 411, the push rod 230 can be kept in a stable position, which is conducive to maintaining a stable wedge fit between the push rod 230 and each segment block 220. When the reverse push block 420 pushes the push rod 230 to move in the opposite direction and moves the locking block 233 away from the bottom of the locking groove 411, the locking block 233 is always locked in the locking groove 411. At this time, the push rod 230 does not rotate, and the locking groove 411 plays a linear guiding role, which helps the push rod 230 to move smoothly in a straight line.

[0053] Understandably, in order to ensure that the first spring 430 does not drive the reverse push block 420 to move, the resistance provided by the second spring 450 is greater than the thrust of the first spring 430. For example, the second spring 450 is a large energy storage spring, which can store a large elastic potential energy in a small space.

[0054] In some alternative embodiments, such as Figure 3 As shown, the other end of the reverse push block 420 extends into the transmission chamber, and the end of the reverse push block 420 extending into the transmission chamber is provided with an overrunning clutch 500. The outer ring of the overrunning clutch 500 is provided with a rotating plate 510, and the rotating plate 510 is provided with an arc-shaped groove 511.

[0055] In this embodiment, when the rotating plate 510 rotates about the central axis of the overrunning clutch 500, the sidewall of the arc-shaped groove 511 interacts with the end of the reverse push block 420, thereby converting the rotational motion of the rotating plate 510 into linear sliding of the reverse push block 420 within the limiting groove 251. Furthermore, under the counterforce of the second spring 450, the outer ring of the overrunning clutch 500 can slip relative to its inner ring, thus causing the reverse push block 420 to return to its original position.

[0056] In some alternative embodiments, such as Figure 5 As shown, a worm gear 120 is rotatably mounted on the machine base 100. The worm gear 120 is parallel to the double-acting lead screw 260, and the worm gear 120 is connected to the rotary drive 270. It can be understood that, in order to use the same rotary drive 270 to simultaneously drive the worm gear 120 and the double-acting lead screw 260, the same end of the worm gear 120 and the double-acting lead screw 260 can be connected by a gear train transmission mechanism 600, such as a sprocket transmission mechanism or a pulley transmission mechanism.

[0057] A worm gear 252, which meshes with the worm 120, is rotatably mounted on the movable seat 250. The worm gear 252 is connected to the inner ring of the overrunning clutch 500 via a transmission component. The transmission component can be a drive shaft or a combination of a drive shaft and gears.

[0058] In this embodiment, when the rotary actuator 270 drives the movable seat 250 away from the working area 110 via the bidirectional lead screw 260, part of the power generated by the rotary actuator 270 is directly used to drive the bidirectional lead screw 260 and control the linear motion of the movable seat 250. At the same time, part of the power is transmitted through the worm gear pair to drive the inner ring of the overrunning clutch 500 to rotate, and then the inner ring of the overrunning clutch 500 drives the outer ring of the overrunning clutch 500 to rotate, thereby causing the rotating plate 510 to rotate around the central axis of the overrunning clutch 500. Finally, the sidewall of the arc groove 511 will interact with the end of the reverse push block 420, thereby converting the rotational motion of the rotating plate 510 into the linear sliding of the reverse push block 420 within the limiting groove 251.

[0059] It should be noted that the transmission ratio between the two-way lead screw 260 and the overrunning clutch 500 can be reasonably set so that the two-way lead screw 260 can quickly drive the overrunning clutch 500 to rotate, thereby moving the locking block 233 away from the bottom of the locking slot 411 in a short time, achieving the purpose of quickly reducing the size of the expansion tube section.

[0060] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A device for expanding the end hole of an expansion tube type radiator, characterized in that, include: The machine is equipped with a work area; A fixing device for securing the expansion tube radiator in the work area; Both sets of tube expansion structures are provided with radially expandable tube expansion sections. The two tube expansion sections are movably mounted on the machine platform and are located on opposite sides of the working area. The two sets of tube expansion sections can move away from each other and move closer together in a straight line. A coupling mechanism is drivenly connected to the expansion tube section so that, during the process of the expansion tube section being inserted into the opening of the heat dissipation tube, the expansion tube section can be driven to a preset expansion size, and during the process of the expansion tube section being withdrawn from the opening of the heat dissipation tube, the size of the expansion tube section can be driven to shrink.

2. The end-hole enlarging device for an expansion tube type radiator according to claim 1, characterized in that, The tube expansion structure includes: An extension tube is movably mounted on the machine base and has a sliding cavity inside; Multiple segmented blocks are slidably connected to one end of the extension tube and surround to form the expansion tube portion. The segmented blocks are also elastically connected to the extension tube, and each segmented block can contract radially under the action of elastic force. The push rod is slidably disposed in the sliding cavity and can simultaneously engage with each of the segment blocks at an oblique angle to push each of the segment blocks to expand radially to the preset expansion size; The coupling mechanism is connected to the push rod to drive the push rod to move to one side of the extension tube and to form a wedge-shaped fit with each of the segment blocks, and to drive the push rod to move to the other side of the extension tube and to release the wedge-shaped fit between the push rod and each of the segment blocks.

3. The end-hole enlarging device for an expansion tube type radiator according to claim 2, characterized in that, The tube expansion structure also includes: Portable seat; A bidirectional lead screw is rotatably mounted on the machine base, and the movable seat is threadedly connected to the bidirectional lead screw; A rotary driver is connected to the bidirectional lead screw drive to drive the bidirectional lead screw to rotate.

4. The end-hole enlarging device for an expansion tube type radiator according to claim 3, characterized in that, After the segmented blocks are assembled, a conical cavity with one end open is formed inside, and the other end of the conical cavity is connected to a cylindrical cavity. The end of the push rod is provided with a conical head that matches the conical cavity.

5. The end-hole enlarging device for an expansion tube type radiator according to claim 4, characterized in that, The push rod is provided with an opening groove at one end away from the dividing block, and the push rod is elastically connected to the sliding cavity to prevent the push rod from moving away from the working area; The coupling mechanism includes: A limiting bracket is located in the opening groove and is fixed to the extension tube by a fastener. The limiting bracket is provided with a slot, and the push rod is provided with a block that cooperates with the slot. A reverse push block is slidably disposed on the movable seat to slide along the moving direction of the push rod. The reverse push block is unidirectionally connected to the bidirectional lead screw. When the bidirectional lead screw drives the movable seat away from the working area, the bidirectional lead screw drives the reverse push block to move away from the working area. The movable seat is elastically connected to the reverse push block to prevent the reverse push block from moving away from the working area.

6. The end-hole enlarging device for an expansion tube type radiator according to claim 5, characterized in that, The coupling mechanism further includes a first spring and a telescopic tube. The two ends of the telescopic tube are respectively connected to the reverse push block and the push rod. The first spring is sleeved on the telescopic tube, and the two ends of the first spring are respectively connected to the first stage tube and the last stage tube of the telescopic tube.

7. The device for expanding the end hole of an expansion tube radiator according to claim 6, characterized in that, The coupling mechanism further includes a second spring, the two ends of which are respectively connected to the reverse push block and the movable seat.

8. The device for expanding the end hole of an expansion tube radiator according to claim 7, characterized in that, The movable seat is provided with a transmission chamber, which is connected to the sliding cavity through a limiting groove. The reverse push block is slidably limited within the limiting groove. The two ends of the first spring are respectively connected to the outer peripheral wall of the push rod and the end of the reverse push block that extends into the sliding cavity. The two ends of the second spring are respectively connected to the inner side wall of the transmission chamber and the end of the reverse push block that extends into the transmission chamber.

9. The end-hole enlarging device for an expansion tube type radiator according to claim 8, characterized in that, The transmission chamber is provided with an overrunning clutch, the outer ring of the overrunning clutch is provided with a rotating plate, the rotating plate is provided with an arc-shaped groove, and one end of the reverse push block extending into the transmission chamber passes through the arc-shaped groove; wherein, when the rotating plate rotates around the central axis of the overrunning clutch, it drives the reverse push block to slide within the limiting groove through the arc-shaped groove.

10. The end-hole enlarging device for an expansion tube type radiator according to claim 9, characterized in that, A worm gear is rotatably mounted on the machine base. The worm gear is parallel to the bidirectional lead screw and is connected to the rotary drive. A turbine gear that meshes with the worm gear is rotatably mounted on the moving base. The turbine gear is connected to the inner ring of the overrunning clutch through a transmission component.

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