Guide pipe end roundness correction device and roundness correction method

Abstract

The invention relates to a pipe end roundness correction device and method for a guide pipe. The pipe end roundness correction device comprises an operation table, a bulging mechanism and a reducing mechanism. The bulging mechanism comprises a bulging mounting block, a conical head pull rod and a plurality of bulging inner supporting dies, the bulging mounting block is mounted on the operation table, the straight rod end of the conical head pull rod is in limiting sliding fit with the bulging mounting block, and a bulging mounting circular groove is formed in the bulging mounting block; the bulging mechanism comprises a bulging mounting circular groove, a plurality of bulging inner supporting dies form an annular structure and are slidably mounted in the bulging mounting circular groove in a limited manner, the inner wall of the annular structure is a conical surface and is in sliding fit with the conical head end of the conical head pull rod, and the diameter reducing mechanism comprises an upper diameter reducing die and a lower diameter reducing die; the lower hole shrinkage die is located under the upper hole shrinkage die and is in limiting sliding fit with the operation table in the vertical direction, and the corresponding ends of the upper hole shrinkage die and the lower hole shrinkage die are each provided with a shaping semicircular through groove. The pipe end roundness correcting device can correct the roundness of the pipe end of the guide pipe with the out-of-tolerance roundness, and normal use of the guide pipe is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of pipe processing technology, and in particular to a pipe end rounding device and a method for rounding pipe ends using the device. Background Technology

[0002] Conduits are essential components in many fields. For example, in the aerospace industry, many components in rocket engines, rocket bodies, and aircraft are connected via conduits. Before being put into use, conduits typically need to be bent into various shapes using a pipe-bending process to adapt to different assembly spaces and working environments.

[0003] With the rapid development of aerospace and other fields, the demand for conduits with shorter straight sections at the ends (i.e., shorter straight sections at the inlet and outlet) is gradually increasing. However, while shorter straight sections at the ends meet more assembly requirements, they can lead to roundness deviations at the ends during bending (e.g., flattening and collapse at the ends). This can result in at least the following problems in subsequent production processes: 1. If the roundness of the conduit end is out of tolerance, the radial misalignment at the connection between the conduit end and the component it connects to (such as the connecting flange) will be too large. It will be difficult to control the internal leakage of the weld, the height of the internal weld will be too high, and the inner diameter of the weld will be smaller than the design requirements.

[0004] 2. If the roundness of the catheter tip is out of tolerance, it will reduce the flow area at the catheter tip and affect the normal use of the catheter.

[0005] 3. If the roundness of the catheter tip is out of tolerance, the components that need to be installed at the catheter tip (such as throttling rings) will not be able to be properly assembled with the catheter tip.

[0006] Therefore, there is an urgent need for a device that can round the end of the catheter. Summary of the Invention

[0007] The purpose of this invention is to provide a device and method for rounding the end of a catheter to solve the problems existing in the prior art.

[0008] To achieve the above objectives, the present invention provides the following solution: In a first aspect, the present invention provides a catheter end rounding device, including an operating table, an expansion mechanism and a diameter reduction mechanism, wherein the expansion mechanism and the diameter reduction mechanism are both mounted on the operating table and are respectively used to expand and reduce the diameter of the catheter end to round the catheter end; The bulging mechanism includes at least a bulging mounting block, a conical tie rod, and several bulging inner support molds. The bulging mounting block is mounted on the operating table. The straight end of the conical tie rod is slidably fitted onto the bulging mounting block. The bulging mounting block has a bulging mounting groove. Several bulging inner support molds are slidably mounted within the bulging mounting groove and arranged sequentially along the circumference of the bulging mounting groove to form a circular ring structure. The inner wall of the circular ring structure is a conical surface adapted to the conical end of the conical tie rod and slidably fitted onto the conical end of the conical tie rod. The end of the guide tube can be sleeved on the outer wall of the circular ring structure. The several bulging inner support molds can expand outward through the movement of the conical tie rod and bulge the end of the guide tube sleeved on the outer wall of the circular ring structure. The diameter reduction mechanism includes at least an upper diameter reduction die and a lower diameter reduction die. The upper diameter reduction die is fixedly installed on the operating table, and the lower diameter reduction die is located directly below the upper diameter reduction die and is limited and slidably fitted on the operating table in the vertical direction. Each end of the upper diameter reduction die and the lower diameter reduction die has a shaping semi-circular through groove. The end of the conduit can be placed between the two shaping semi-circular through grooves, and the end of the conduit placed between the two shaping semi-circular through grooves can be reduced in diameter by the movement of the lower diameter reduction die toward the upper diameter reduction die.

[0009] According to one embodiment of the present invention, the bulging mechanism further includes a plurality of inner support mold limiting blocks, and the plurality of inner support mold limiting blocks are respectively fixedly connected to one end of the plurality of bulging inner support molds away from the cone head tie rod; The inner wall of the bulging mounting groove is provided with a plurality of bulging limiting sliding grooves, and a plurality of inner support mold limiting blocks are respectively limited and slidably installed in a plurality of bulging limiting sliding grooves. The bulging inner support mold is limited and slidably installed in the bulging mounting groove through the inner support mold limiting blocks and the bulging limiting sliding grooves.

[0010] According to one embodiment of the present invention, the bulging mechanism further includes a bulging nut, and an external thread is provided on the straight end of the conical tie rod. The bulging nut is threadedly engaged with the straight end of the conical tie rod through the external thread. The end of the bulging nut near the bulging mounting block is used to abut against the bulging mounting block.

[0011] According to one embodiment of the present invention, the bulging mechanism further includes a pull rod limiting block, the pull rod limiting block is mounted on the operating table and spaced apart from the bulging mounting block, and the straight end of the conical pull rod is limited and slidably engaged with the pull rod limiting block; A rod stop plate is installed on the straight end of the conical rod. When the conical rod moves, the rod stop plate can limit the conical rod by contacting and engaging with the rod limiting block.

[0012] According to one embodiment of the present invention, the diameter reduction mechanism further includes at least two diameter reduction guide rods that are parallel to each other and both arranged in a vertical direction, the bottom of the diameter reduction guide rods being fixedly mounted on the operating table; the diameter reduction upper die is fixedly mounted on the top of the diameter reduction guide rods, and the diameter reduction upper die is fixedly mounted on the operating table through the diameter reduction guide rods; The reduced-diameter lower die is slidably fitted on the reduced-diameter guide rod, and the reduced-diameter lower die is slidably fitted on the operating table in the vertical direction via the reduced-diameter guide rod.

[0013] According to one embodiment of the present invention, the diameter reduction mechanism further includes an upper die holder and a lower die holder; The upper mold base is fixedly connected to the reduced diameter upper mold, the upper mold base is fixedly installed on the top of the reduced diameter guide rod, and the reduced diameter upper mold is fixedly installed on the top of the reduced diameter guide rod through the upper mold base; The lower mold base is fixedly connected to the reduced diameter lower mold. The lower mold base has at least two lower mold limiting sliding through holes. The two lower mold limiting sliding through holes are respectively sleeved on the two reduced diameter guide rods and respectively limit sliding cooperation with the two reduced diameter guide rods. The reduced diameter lower mold is limited sliding cooperation on the reduced diameter guide rods through the lower mold base and the lower mold limiting sliding through holes.

[0014] According to one embodiment of the present invention, the diameter reduction mechanism further includes a tapered stopper rod, a mounting bracket, a spring limiting rod, and a spring; The mounting bracket is mounted on the upper mold base, the spring limiting rod is mounted on the mounting bracket, one end of the spring is fixedly connected to the mounting bracket and sleeved on the spring limiting rod, and the other end of the spring is connected to the straight rod end of the conical stopper rod; When the upper die and the lower die come into contact, the two shaping semi-circular slots form a shaping circular through hole. The cone end of the cone-shaped plug is located in the shaping circular through hole to support the end of the guide tube placed between the two shaping semi-circular slots. The shaping circular through hole, the cone-shaped plug, the spring, and the spring limiting rod are all coaxially arranged.

[0015] According to one embodiment of the present invention, a hydraulic cylinder is installed on the operating table, and the output end of the hydraulic cylinder abuts against the bottom end of the lower mold base.

[0016] According to one embodiment of the present invention, the bottom end of the operating table is equipped with a support leg.

[0017] Secondly, the present invention also provides a method for rounding the catheter tip, the method comprising the step of using the catheter tip rounding device described in any of the above descriptions, the method comprising at least: S1: Fit the end of the conduit onto the outer wall of the annular structure; S2: Move the cone-shaped tie rod along its axial direction to bulge the end of the conduit tube by the outward expansion of several bulging inner support molds; S3: Place the end of the conduit between the two shaping semi-circular grooves; S4: Displace the lower reducing die upwards until it contacts the upper reducing die, so as to reduce the diameter of the conduit end by gradually approaching the two shaping semi-circular through slots. S5: Check the roundness of the tube end. If the roundness is not up to standard, repeat S1 to S4.

[0018] Beneficial effects This invention has at least the following technical effects: This invention, through the inclusion of an expansion and reduction mechanism, can correct the roundness of the conduit end that has excessive roundness tolerance. This prevents excessive radial misalignment at the connection point between the conduit end and its mating components (such as flanges), thus controlling weld leakage, ensuring the weld height is not excessive, and maintaining the weld diameter within the design specifications. Simultaneously, the expansion and reduction mechanisms also prevent a reduction in the flow area at the conduit end, ensuring normal conduit use and allowing for proper assembly of components (such as throttling coils) to the conduit end. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 A schematic diagram of the overall structure from another angle; Figure 3 for Figure 1 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the overall structure of the bulging mechanism in this invention; Figure 5 for Figure 4 A schematic diagram of the overall structure from another angle; Figure 6 for Figure 4A schematic diagram of the cross-sectional structure; Figure 7 This is a schematic diagram of the overall structure of the bulging mounting block in this invention; Figure 8 This is a schematic diagram of the overall structure of the inner support mold limiting block and the bulging inner support mold in this invention; Figure 9 This is a schematic diagram of the overall structure of the diameter reduction mechanism in this invention; Figure 10 This is a schematic diagram of the overall structure of the upper mold base, the reduced diameter upper mold, the conical stopper rod, the mounting bracket, the spring limit rod, and the spring.

[0021] Explanation of reference numerals in the attached figures: 1. Support leg; 2. Operating table; 3. Bulging mechanism; 301. Bulging base; 302. Bulging mounting block; 303. Bulging inner support mold; 304. Inner support mold limiting block; 305. Conical tie rod; 306. Bulging nut; 307. Tie rod limiting block; 308. Tie rod stop; 4. Diameter reduction mechanism; 401. Diameter reduction guide rod; 402. Lower mold base; 403. Diameter reduction lower mold; 404. Upper mold base; 405. Diameter reduction upper mold; 406. Auxiliary guide block; 407. Conical stopper rod; 408. Mounting bracket; 409. Spring limiting rod; 410. Spring; 5. Hydraulic cylinder. Detailed Implementation

[0022] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and to exemplify the principles of the present invention, and are not configured to limit the present invention. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of the present invention.

[0023] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0024] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0025] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., without specifically indicating order or sequence, and should not be considered restrictive. Similar terms are used throughout the description to represent similar elements.

[0026] It will be apparent to those skilled in the art that the present invention can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

[0027] It should be understood that the "rounding" described in this invention can also be called "rounding correction" or "roundness correction", which all refer to the process of restoring the tube end (i.e. the inlet and outlet positions of the tube) to a standard circle, in order to avoid the tube end of the tube having a roundness deviation. This will not be elaborated on here.

[0028] In the following embodiments, there may be descriptions such as "this device". Those skilled in the art should understand that "this device" refers to a catheter end rounding device provided by the present invention.

[0029] Firstly, such as Figures 1-10 As shown, the present invention provides a device for rounding the end of a conduit.

[0030] In this embodiment, as Figure 1 and Figure 2 As shown, this device includes at least an operating table 2, an expansion mechanism 3, and a diameter reduction mechanism 4. The expansion mechanism 3 and the diameter reduction mechanism 4 are both mounted on the operating table 2 and spaced apart. The expansion mechanism 3 can be used to expand the end of the conduit, and the diameter reduction mechanism 4 can be used to reduce the diameter of the end of the conduit, thereby enabling the conduit end to be rounded.

[0031] In this embodiment, the expansion mechanism 3 and the diameter reduction mechanism 4 can restore the end of the conduit to a standard circular shape (i.e., rounding), thereby preventing the conduit end from having excessive roundness (e.g., flattening and collapse deformation). This prevents excessive radial misalignment at the connection between the conduit end and its mating components (e.g., flanges), ensuring that weld leakage is not difficult to control, the weld height is not excessive, and the inner diameter at the weld is not less than the design requirements. Simultaneously, this device avoids a reduction in the flow area at the conduit end, ensuring normal use of the conduit and allowing for proper assembly of components (e.g., throttling rings) to the conduit end.

[0032] Specifically, in this embodiment, such as Figure 4 , Figure 5 and Figure 6 As shown, the bulging mechanism 3 includes at least a bulging mounting block 302, a conical tie rod 305, and several bulging inner support molds 303. The bulging mounting block 302 is fixedly mounted on the operating table 2, and the straight end of the conical tie rod 305 is slidably fitted onto the bulging mounting block 302. Figure 7 As shown, the bulging mounting block 302 has a bulging mounting groove. Several bulging inner support molds 303 are slidably mounted within the bulging mounting groove and arranged sequentially along the circumference of the groove to form a ring structure. That is, several bulging inner support molds 303 are slidably mounted inside the bulging mounting groove. The inner wall of the ring structure (i.e., the inner wall of the ring structure composed of several bulging inner support molds 303) is a tapered surface adapted to the tapered end of the tapered tie rod 305, and this tapered surface can slide in contact with the tapered end of the tapered tie rod 305. The end of the conduit can be fitted onto the outer wall of the ring structure (i.e., the outer wall of the ring structure composed of several bulging inner support molds 303), thereby enabling the bulging of the conduit end.

[0033] It should be understood that, in this embodiment, as Figure 6 As shown, the straight end of the conical tie rod 305 refers to... Figure 6 The straight section on the right side of the conical head tie rod 305, the conical end of the conical head tie rod 305 refers to... Figure 6 The tapered head portion on the left side of the 305 middle tapered head tie rod.

[0034] In this embodiment, several bulging inner support molds 303 can expand outwards through the movement of the conical tie rod 305, and bulge the end of the conduit tube on the outer wall of the annular structure formed by the multiple bulging inner support molds 303. Specifically, with Figure 6Taking the direction of the cone head as an example, the cone head end of the cone head tie rod 305 can be a cone structure that gradually decreases in size from left to right, and the inner wall of the annular structure composed of multiple expanding inner support molds 303 can also be a cone structure that gradually decreases in size from left to right (that is, the inner wall of the annular structure composed of multiple expanding inner support molds 303 is a cone surface that matches the cone head end of the cone head tie rod 305). Therefore, when the cone head tie rod 305 moves to the left (at this time, the cone head end of the cone head tie rod 305 also moves to the left), several expanding inner support molds 303 will gradually converge towards the center of the annulus, and when the cone head tie rod 305 moves to the right (at this time, the cone head end of the cone head tie rod 305 also moves to the right), several expanding inner support molds 303 will gradually expand outward ( Figure 6 The state shown is when several bulging inner support molds 303 are expanded to their maximum extent, thereby compressing and bulging the inner wall of the conduit end.

[0035] In this embodiment, as Figure 4 As shown, the number of bulging inner support molds 303 can preferably be four, but this is not particularly limited here.

[0036] In this embodiment, as Figure 4 , Figure 5 and Figure 6 As shown, the bulging mechanism 3 further includes a bulging base 301, the bottom end of which is fixedly mounted on the operating table 2, and the bulging mounting block 302 is fixedly mounted on the bulging base 301, that is, the bulging mounting block 302 can be fixedly mounted on the operating table 2 through the bulging base 301.

[0037] Specifically, in this embodiment, such as Figure 9 As shown, the diameter reduction mechanism 4 includes at least a diameter reduction upper die 405 and a diameter reduction lower die 403. The diameter reduction upper die 405 is fixedly mounted on the operating table 2, and the diameter reduction lower die 403 is located directly below the diameter reduction upper die 405 and can be vertically limited and slidably fitted onto the operating table 2; that is, the diameter reduction lower die 403 can be vertically limited and slidably fitted onto the area directly below the diameter reduction upper die 405. The corresponding ends of the diameter reduction upper die 405 and the diameter reduction lower die 403 (i.e.,...) Figure 9 Both the bottom end of the upper die 405 and the top end of the lower die 403 are provided with shaping semi-circular grooves. The end of the conduit can be placed between the two shaping semi-circular grooves, and the end of the conduit placed between the two shaping semi-circular grooves can be reduced in diameter by moving the lower die 403 toward the upper die 405.

[0038] More specifically, in this embodiment, as Figure 6 and Figure 8As shown, the bulging mechanism 3 further includes a plurality of inner support mold limiting blocks 304. The number of the plurality of inner support mold limiting blocks 304 is the same as the number of the plurality of bulging inner support molds 303, and the plurality of inner support mold limiting blocks 304 are respectively fixedly connected to one end of the plurality of bulging inner support molds 303 away from the cone head tie rod 305.

[0039] In this embodiment, since the number of bulging inner support molds 303 is preferably four, the number of inner support mold limiting blocks 304 is also four.

[0040] In this embodiment, as Figure 6 and Figure 7 As shown, several expansion-shaped limiting sliding grooves are formed on the inner wall of the expansion-shaped mounting groove. These grooves are respectively adapted to and correspond one-to-one with several inner support mold limiting blocks 304. The inner support mold limiting blocks 304 can be slidably mounted inside the expansion-shaped limiting sliding grooves, meaning the expansion-shaped inner support mold 303 can be slidably mounted inside the expansion-shaped mounting groove via the inner support mold limiting blocks 304 and the expansion-shaped limiting sliding grooves.

[0041] In this embodiment, since there are four inner support mold limiting blocks 304, there are also four bulging limiting sliding grooves.

[0042] Furthermore, in order to facilitate the movement of the conical tie rod 305 along its axial direction, and to ensure that the inner expansion mold 303 maintains a compressive expansion state on the inner wall of the conduit end during the expansion process, in this embodiment, as follows: Figure 5 and Figure 6 As shown, the expansion mechanism 3 further includes an expansion nut 306. An external thread is provided on the straight end of the conical tie rod 305, and the expansion nut 306 can engage with the threaded end of the straight tie rod 305 via the external thread; that is, the expansion nut 306 is threadedly engaged on the straight end of the conical tie rod 305. The end of the expansion nut 306 near the expansion mounting block 302 can be used to abut against the expansion mounting block 302.

[0043] In this embodiment, as Figure 5 As shown, the expansion nut 306 can be a hexagonal nut, which allows the expansion nut 306 to be easily rotated using an external wrench (a prior art known in the art).

[0044] Furthermore, in order to improve the stability of the cone-shaped tie rod 305 during movement, such as... Figure 5 and Figure 6As shown, the bulging mechanism 3 further includes a pull rod limiting block 307. The pull rod limiting block 307 is fixedly installed on the operating table 2 and located on one side of the bulging mounting block 302, that is, the pull rod limiting block 307 and the bulging mounting block 302 are spaced apart, and the straight end of the conical pull rod 305 can be limited and slidably engaged with the pull rod limiting block 307.

[0045] In this embodiment, the bottom end of the pull rod limiting block 307 is fixedly installed on the bulging base 301, that is, the pull rod limiting block 307 can be fixedly installed on the operating table 2 through the bulging base 301.

[0046] Furthermore, such as Figure 5 and Figure 6 As shown, a pull rod baffle 308 is fixedly installed on the straight end of the conical pull rod 305. The pull rod baffle 308 is spaced a certain distance from the pull rod limiting block 307 and can contact and engage with the pull rod limiting block 307. Wherein, as... Figure 6 As shown, the pull rod limiting block 307 will be located between the pull rod baffle 308 and the expansion mounting block 302, and the pull rod limiting block 307 will also be located between the pull rod baffle 308 and the expansion nut 306.

[0047] In this embodiment, by providing the pull rod stop 308, when the conical pull rod 305 moves, the pull rod stop 308 can limit the conical pull rod 305 by contacting and engaging with the pull rod limiting block 307. Specifically, with Figure 6 Taking the direction in the middle as an example, when the cone-shaped tie rod 305 is facing... Figure 6 When the rod moves a certain distance from right to left, the rod stop 308 will contact the rod limit block 307, thereby preventing the cone rod 305 from continuing to move to the left and preventing the cone rod 305 from disengaging from the limit sliding engagement with the rod limit block 307.

[0048] Specifically, such as Figure 9 As shown, the diameter reduction mechanism 4 further includes at least two parallel diameter reduction guide rods 401, both arranged vertically, and the two diameter reduction guide rods 401 are symmetrically arranged. The bottom of the diameter reduction guide rod 401 is fixedly mounted on the operating table 2, and the upper diameter reduction die 405 is fixedly mounted on the top of the diameter reduction guide rod 401, meaning the upper diameter reduction die 405 can be fixedly mounted on the operating table 2 via the diameter reduction guide rod 401. The lower diameter reduction die 403 is slidably fitted onto the diameter reduction guide rod 401, meaning the lower diameter reduction die 403 can be slidably fitted onto the operating table 2 vertically via the diameter reduction guide rod 401, and also directly below the upper diameter reduction die 405 via the diameter reduction guide rod 401.

[0049] In this embodiment, the reduced diameter guide rod 401 can be a cylindrical structure, and the number of reduced diameter guide rods 401 can preferably be two, which is not particularly limited here.

[0050] More specifically, such as Figure 9 As shown, the diameter reduction mechanism 4 further includes an upper mold base 404 and a lower mold base 402. The upper mold base 404 is fixedly connected to the diameter reduction upper mold 405 and is fixedly mounted on the top of the diameter reduction guide rod 401, meaning the diameter reduction upper mold 405 can be fixedly mounted on the top of the diameter reduction guide rod 401 via the upper mold base 404. The lower mold base 402 is fixedly connected to the diameter reduction lower mold 403. The lower mold base 402 has at least two lower mold limiting sliding through holes, which are respectively fitted onto the two diameter reduction guide rods 401 and respectively limited and slidably engaged with the outer walls of the two diameter reduction guide rods 401, meaning the diameter reduction lower mold 403 can be limited and slidably engaged on the diameter reduction guide rod 401 via the lower mold base 402 and the lower mold limiting sliding through holes.

[0051] In this embodiment, both the upper mold base 404 and the lower mold base 402 can be cuboid structures, and no particular limitation is made here.

[0052] Furthermore, such as Figure 9 As shown, the diameter reduction mechanism 4 further includes an auxiliary guide block 406. One end of the auxiliary guide block 406 is fixedly connected to the outer wall of the diameter reduction upper die 405, and the other end of the auxiliary guide block 406 is slidably engaged with the outer wall of the diameter reduction lower die 403. Alternatively, one end of the auxiliary guide block 406 is fixedly connected to the outer wall of the diameter reduction lower die 403, and the other end of the auxiliary guide block 406 is slidably engaged with the outer wall of the diameter reduction upper die 405.

[0053] In this embodiment, due to tolerances and other reasons, there may be a gap (i.e., clearance fit) between the inner wall of the lower die limiting sliding through hole on the lower die holder 402 and the outer wall of the diameter reduction guide rod 401. In this case, the lower die holder 402 will wobble slightly when sliding on the diameter reduction guide rod 401. However, by setting the auxiliary guide block 406, the diameter reduction upper die 405 and the diameter reduction lower die 403 can be further limited, thereby effectively preventing the slight wobble of the lower die holder 402 when sliding on the diameter reduction guide rod 401, and ensuring the normal operation of the extrusion and diameter reduction work on the end of the guide tube.

[0054] More specifically, in this embodiment, as Figure 3 and Figure 10As shown, the diameter reduction mechanism 4 further includes a conical stopper 407, a mounting bracket 408, a spring limiting rod 409, and a spring 410. One end of the mounting bracket 408 is fixedly mounted on the upper mold base 404, the spring limiting rod 409 is fixedly mounted on the mounting bracket 408, one end of the spring 410 is fixedly connected to the mounting bracket 408 and slidably sleeved on the spring limiting rod 409, and the other end of the spring 410 is connected to the straight rod end of the conical stopper 407.

[0055] In this embodiment, a spring placement groove can be provided at the straight end of the conical stopper rod 407. The other end of the spring 410 can be placed inside the spring placement groove and press-fitted against the inner wall of the groove, thereby connecting the other end of the spring 410 to the straight end of the conical stopper rod 407. Since the spring 410 is sleeved on the spring limiting rod 409, the diameter of the spring placement groove must be larger than the diameter of the spring limiting rod 409, meaning the spring limiting rod 409 can extend into the spring placement groove.

[0056] In this embodiment, when the lower die 403 moves toward the upper die 405, the lower die 403 and the upper die 405 will come into contact with each other (i.e., Figure 9 In the state described above, the two semi-circular grooves form a shaped circular hole. The conical end of the cone-shaped stopper 407 can be located inside the shaped circular hole, thereby supporting the end of the conduit placed between the two semi-circular grooves (i.e., inside the shaped circular hole). The shaped circular hole, cone-shaped stopper 407, spring 410, spring placement groove, and spring limiting rod 409 are all coaxially arranged.

[0057] In this embodiment, as Figure 1 and Figure 2 As shown, a hydraulic cylinder 5 is fixedly installed on the operating table 2. The output end of the hydraulic cylinder 5 is located below the lower mold base 402 and abuts against the bottom end of the lower mold base 402.

[0058] In some embodiments of the present invention, the hydraulic cylinder 5 may also be an electric cylinder or other components known in the art that can provide pressure, without particular limitation.

[0059] In this embodiment, with Figure 9 Taking the direction in the middle as an example, the output end of the hydraulic cylinder 5 can push the lower mold base 402 and the reduced diameter lower mold 403 to move upward. The reduced diameter lower mold 403 will gradually approach the reduced diameter upper mold 405 until it comes into contact with the reduced diameter upper mold 405. At this time, the inner wall of the forming round through hole formed by the two forming semi-circular through slots will squeeze the outer wall of the tube end of the guide tube, thereby squeezing and reducing the diameter of the outer wall of the tube end of the guide tube.

[0060] In this embodiment, as Figure 1 and Figure 2 As shown, the bulging mechanism 3, the diameter reduction mechanism 4, and the hydraulic cylinder 5 can all be fixedly installed on the top of the operating table 2.

[0061] Furthermore, in this embodiment, in order to improve the stability of the device, a support leg 1 is installed at the bottom of the operating platform 2, and a reinforcing plate or several reinforcing rods (not shown in the figure) are fixedly installed at the bottom of the operating platform 2.

[0062] In this embodiment, the support leg 1 can be a rectangular frame structure, or the support leg 1 can be a roughly rectangular frame structure, and the twelve support beams in the support leg 1 can all be square beams, without any particular limitation.

[0063] In this embodiment, the above-mentioned fixed connection methods can all be welding connections or bolted connections known in the art, and will not be described in detail here.

[0064] Secondly, the present invention also provides a method for rounding the catheter tip, the method comprising the step of using the catheter tip rounding device described in any one of the above descriptions, and the method including but not limited to the following steps: Step S1: Place the end of the conduit that needs to be rounded onto the outer wall of the annular structure composed of several bulging inner support molds 303.

[0065] Step S2: After completing step S1, displace the conical tie rod 305 along its axial direction (that is, move the conical tie rod 305 along its axial direction). Figure 6 The displacement is made from left to right, so that the inner wall of the tube end is squeezed by the outward expansion of several bulging inner support molds 303, and the tube end of the tube that needs to be rounded is squeezed and bulged for about 30 seconds.

[0066] Before proceeding to step S1, the cone-shaped tie rod 305 needs to be aligned with... Figure 6 The displacement proceeds from right to left. At this time, several bulging inner support molds 303 will gradually converge towards the center of the ring to ensure that the tube end with out-of-roundness (i.e., the non-circular tube end) can be fitted onto the outer wall of the annular structure composed of several bulging inner support molds 303.

[0067] In step S2, the conical tie rod 305 can be displaced axially by rotating the expansion nut 306 (during the tightening of the expansion nut 306, since the conical end of the conical tie rod 305 contacts the expansion inner support mold 303, the friction between the two prevents the conical tie rod 305 from rotating synchronously with the expansion nut 306). Alternatively, the conical tie rod 305 can be displaced axially by manual pulling, and when the conical tie rod 305 reaches the desired position, the expansion nut 306 can be rotated to abut against the expansion mounting block 302; this is not specifically limited here.

[0068] Step S3: After completing step S2, place the end of the conduit that has completed step S2 between the two shaping semi-circular grooves.

[0069] Step S4: Displace the reduced diameter lower die 403 upward (that is, move the reduced diameter lower die 403 along...) Figure 9 The displacement proceeds from bottom to top until it contacts the reducing die 405 (at which point the two shaping semi-circular slots will form shaping circular through holes). By gradually bringing the two shaping semi-circular slots closer together, the inner walls of the two shaping semi-circular slots squeeze the outer wall of the tube end, thereby reducing the diameter of the tube end that needs to be rounded for about 30 seconds.

[0070] In step S4, the cone-shaped plug 407 needs to be inserted into the end of the catheter to provide support for the end of the catheter.

[0071] In step S4, the output end of the hydraulic cylinder 5 can be used to move the lower die 403 upward and extrude the tube end of the guide tube to reduce its diameter. Beforehand, it can be checked whether the decompression knob on the hydraulic cylinder 5 is in the tightened state. Simultaneously, the output end of the hydraulic cylinder 5 can be activated by swinging the manual hydraulic pump lever on the hydraulic cylinder 5 up and down.

[0072] Step S5: After completing step S4, check the roundness of the catheter tip; if the roundness is acceptable, the catheter tip roundness is complete; if the roundness is unacceptable, repeat steps S1 to S4.

[0073] It should be understood that if only the end of the catheter is expanded, the diameter of the catheter end will be too large. If only the diameter of the catheter end is reduced, the catheter end will not be rounded (i.e., the catheter end may be squeezed into an irregular shape other than a standard circle). Therefore, the "expansion first, then reduction" method used in this embodiment not only avoids the catheter end having an excessively large diameter, but also ensures the roundness of the catheter end.

[0074] It should be understood that the longer the expansion and contraction times, the better the roundness of the catheter tip; however, excessive time will seriously affect the roundness efficiency. Extensive testing has shown that an expansion and contraction time of approximately 30 seconds not only ensures a good roundness of the catheter tip but also does not affect the roundness efficiency.

[0075] It should be understood that the above-described embodiments or examples of the present invention can be combined with each other and have corresponding technical effects.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for rounding the end of a conduit, characterized in that, It includes an operating table (2), an expansion mechanism (3) and a diameter reduction mechanism (4). The expansion mechanism (3) and the diameter reduction mechanism (4) are both installed on the operating table (2) and are used to expand and reduce the diameter of the tube end, respectively, so as to round the tube end. The bulging mechanism (3) includes at least a bulging mounting block (302), a conical tie rod (305), and several bulging inner support molds (303); the bulging mounting block (302) is mounted on the operating table (2), the straight end of the conical tie rod (305) is limited and slidably fitted on the bulging mounting block (302), the bulging mounting block (302) is provided with a bulging mounting circular groove, and several bulging inner support molds (303) are all limited and slidably mounted. The components are arranged sequentially in the bulging mounting groove and along the circumference of the bulging mounting groove to form a circular structure; the inner wall of the circular structure is a tapered surface that matches the tapered end of the tapered tie rod (305) and slides in cooperation with the tapered end of the tapered tie rod (305); a plurality of the bulging inner support molds (303) can expand outward by the movement of the tapered tie rod (305) and bulge the end of the guide tube sleeved on the outer wall of the circular structure; The diameter reduction mechanism (4) includes at least a diameter reduction upper mold (405) and a diameter reduction lower mold (403). The diameter reduction upper mold (405) is fixedly installed on the operating table (2). The diameter reduction lower mold (403) is located directly below the diameter reduction upper mold (405) and is limited and slidably fitted on the operating table (2) in the vertical direction. A shaping semi-circular through groove is opened at one end of the diameter reduction upper mold (405) and the diameter reduction lower mold (403). The end of the guide tube placed between the two shaping semi-circular through grooves can be reduced in diameter by moving the diameter reduction lower mold (403) toward the diameter reduction upper mold (405).

2. The catheter end rounding device according to claim 1, characterized in that, The bulging mechanism (3) further includes a plurality of inner support mold limiting blocks (304), and the plurality of inner support mold limiting blocks (304) are respectively fixedly connected to one end of the plurality of bulging inner support molds (303) away from the cone head tie rod (305); The inner wall of the bulging mounting groove is provided with a plurality of bulging limiting sliding grooves, and a plurality of inner support mold limiting blocks (304) are respectively limited and slidably installed in the plurality of bulging limiting sliding grooves. The bulging inner support mold (303) is limited and slidably installed in the bulging mounting groove through the inner support mold limiting blocks (304) and the bulging limiting sliding grooves.

3. The catheter end rounding device according to claim 1, characterized in that, The expansion mechanism (3) further includes an expansion nut (306), and the straight end of the conical pull rod (305) is provided with an external thread. The expansion nut (306) is threadedly engaged with the straight end of the conical pull rod (305) through the external thread. The end of the expansion nut (306) near the expansion mounting block (302) is used to abut against the expansion mounting block (302).

4. The catheter end rounding device according to claim 1, characterized in that, The bulging mechanism (3) further includes a pull rod limiting block (307), which is installed on the operating table (2) and spaced apart from the bulging mounting block (302), and the straight end of the conical pull rod (305) is limited and slidably fitted on the pull rod limiting block (307); A rod stop plate (308) is installed on the straight end of the conical rod (305). When the conical rod (305) moves, the rod stop plate (308) can limit the conical rod (305) by contacting and cooperating with the rod limiting block (307).

5. The catheter end rounding device according to claim 1, characterized in that, The diameter reduction mechanism (4) further includes at least two diameter reduction guide rods (401) that are parallel to each other and both arranged in a vertical direction. The bottom of the diameter reduction guide rods (401) is fixedly installed on the operating table (2). The diameter reduction upper mold (405) is fixedly installed on the top of the diameter reduction guide rods (401). The diameter reduction upper mold (405) is fixedly installed on the operating table (2) through the diameter reduction guide rods (401). The reduced diameter lower die (403) is limited and slidably fitted on the reduced diameter guide rod (401), and the reduced diameter lower die (403) is limited and slidably fitted on the operating table (2) in the vertical direction through the reduced diameter guide rod (401).

6. The catheter end rounding device according to claim 5, characterized in that, The diameter reduction mechanism (4) further includes an upper mold base (404) and a lower mold base (402). The upper mold base (404) is fixedly connected to the reduced diameter upper mold (405). The upper mold base (404) is fixedly installed on the top of the reduced diameter guide rod (401). The reduced diameter upper mold (405) is fixedly installed on the top of the reduced diameter guide rod (401) through the upper mold base (404). The lower mold base (402) is fixedly connected to the reduced diameter lower mold (403). The lower mold base (402) has at least two lower mold limiting sliding through holes. The two lower mold limiting sliding through holes are respectively sleeved on the two reduced diameter guide rods (401) and respectively limit sliding cooperation with the two reduced diameter guide rods (401). The reduced diameter lower mold (403) is limited sliding cooperation on the reduced diameter guide rod (401) through the lower mold base (402) and the lower mold limiting sliding through holes.

7. The catheter end rounding device according to claim 6, characterized in that, The diameter reduction mechanism (4) further includes a cone-shaped stopper (407), a mounting bracket (408), a spring-limiting rod (409), and a spring (410). The mounting bracket (408) is mounted on the upper mold base (404), the spring limiting rod (409) is mounted on the mounting bracket (408), one end of the spring (410) is fixedly connected to the mounting bracket (408) and sleeved on the spring limiting rod (409), and the other end of the spring (410) is connected to the straight rod end of the conical stopper (407); When the upper die (405) and the lower die (403) come into contact, the two shaping semi-circular through slots will form a shaping circular through hole. The cone end of the cone-shaped plug (407) is located in the shaping circular through hole to support the end of the guide tube placed between the two shaping semi-circular through slots. The shaping circular through hole, the cone-shaped plug (407), the spring (410) and the spring limiting rod (409) are all coaxially arranged.

8. The catheter end rounding device according to claim 6, characterized in that, A hydraulic cylinder (5) is installed on the operating table (2), and the output end of the hydraulic cylinder (5) abuts against the bottom end of the lower mold base (402).

9. The catheter end rounding device according to claim 1, characterized in that, The bottom of the operating table (2) is equipped with a support leg (1).

10. A method for rounding the end of a conduit, characterized in that, The method includes the step of using the catheter tip rounding device according to any one of claims 1-9, the method comprising: S1: Fit the end of the conduit onto the outer wall of the annular structure; S2: Move the cone-shaped tie rod (305) along its axial direction to bulge the end of the conduit tube by the outward expansion of the plurality of the bulging inner support molds (303); S3: Place the end of the conduit between the two shaping semi-circular grooves; S4: Displace the lower reducing die (403) upward until it contacts the upper reducing die (405) to reduce the diameter of the conduit end by gradually approaching the two shaping semicircular through slots. S5: Check the roundness of the tube end. If the roundness is not up to standard, repeat S1 to S4.

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