Hole plugging device, application of hole plugging device in clean sealing scene and manufacturing method of hole plugging device

Abstract

The invention belongs to the technical field of pipe system plugging accessories and pipe plugs, and particularly relates to a hole channel plugging device, application of the hole channel plugging device in a clean sealing scene and a manufacturing method. The hole channel plugging device is formed by preassembling a sealing sleeve and an inner core, the sealing sleeve is provided with a conical inner surface, the inner core is provided with a matched conical outer surface, and the inner core is pulled through a pulling tool to extrude the conical surface so that the sealing sleeve can expand in the radial direction to plug a hole channel. The manufacturing method comprises the steps that the inner core and the barrel blank with the outer conical surface are machined, after the inner core is coaxially installed in the barrel blank, an extrusion die is adopted to conduct radial shrinkage shaping on an assembly, the die is provided with a shaping conical opening and a columnar channel, the barrel wall is shrunk by pushing the barrel blank to penetrate through the shaping conical opening, and the conical interface matching structure is formed. According to the method, the production process is simplified through integrated extrusion forming, and the matching precision of the internal conical surface of the plugging device is guaranteed. The prepared pore channel plugging device has excellent sealing performance and operation convenience, has no pollution or damage to the pore channel, and is especially suitable for high-pressure clean sealing scenes.

Description

[0001] This application is a divisional application. The application number of the original application is 202510315460.1, and the original application date is March 18, 2025. The entire content of the original application is incorporated into this application by reference. Technical Field

[0002] The present invention belongs to the technical field of pipe system plugging accessories and pipe plugs, and specifically relates to a channel plugger, its application in clean sealing scenarios, and a manufacturing method. Background Art

[0003] As a key sealing component of industrial equipment, channel plugs are used to seal process holes, oil / gas lines, and high-pressure media in mechanical manufacturing, the automotive industry, and energy equipment. The reliability of their sealing is directly related to the safe operation of the equipment, especially in high-pressure hydraulic systems and flammable and explosive media scenarios, where leakage may cause system failure or major safety accidents. In addition, modern industry has higher requirements for operational convenience, such as adaptability to standard straight holes, ready-to-use features without on-site assembly, and compatibility with general tools. In high-cleanliness areas such as medical equipment, food processing production lines, biopharmaceutical systems, and semiconductor manufacturing equipment, installation methods such as threading, tapping, and expansion can easily generate metal debris, posing a risk of contamination. Therefore, it is of great value to develop new sealing solutions that combine high sealing performance, operational convenience, and clean installation characteristics.

[0004] In the existing technology, the manufacture of conventional channel occluders generally adopts a split processing mode, that is, each component is formed separately through cutting, stamping and other processes, and then assembled through mechanical assembly. However, in the development process of new channel occluders, a design scheme different from the traditional structure may be formed. When a new channel occluder has a non-traditional structural design, the existing mature split processing mode will be difficult to meet the needs of industrialized manufacturing of new channel occluders. Therefore, how to break through the processing and manufacturing methods of existing channel occluders and develop a manufacturing method that can efficiently and high-quality manufacture channel occluders with new structural characteristics is also a technical problem faced in the development process of new channel occluders. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a duct plugger, its application in clean sealing scenarios, and a manufacturing method.

[0006] The channel occluder of the present invention includes a sealing sleeve for insertion into the channel; the sealing sleeve has a closed blocking end face and an extruded side wall extending from the edge of the blocking end face, and the proximal end of the sealing sleeve has an opening; the inner surface of the extruded side wall is at least partially a conical inner surface; in the direction toward the proximal end, the radial dimension of the conical inner surface decreases, and the thickness of the extruded side wall where the conical inner surface is located increases; an inner core is pre-retained in the cavity formed by the blocking end face and the extruded side wall; the inner core has a circumferential outer surface, at least partially a conical outer surface, and the radial dimension of the conical outer surface decreases in the direction approaching the proximal end; the inner core can move proximally relative to the sealing sleeve under the action of a pulling tool, causing the conical outer surface to squeeze the conical inner surface, causing the sealing sleeve to radially expand and squeeze the inner wall of the channel. Based on the above structure, the channel occluder has the following beneficial effects: it can take into account high-reliability sealing, convenient operation, and ensure that the interior of the channel is clean and pollution-free.

[0007] As a further optimization of the duct occluder, a rod-shaped portion is integrally connected to the proximal end of the inner core. A circumferential breakaway groove is formed at the junction of the inner core and the rod-shaped portion. This pre-designed rod-shaped portion and breakaway groove allow the duct occluder to be used with conventional breakaway duct occluder operating instruments, eliminating the need for separate design and matching operating instruments.

[0008] As a further optimization of the duct plugger, the inner core has a buckle for detachable connection to the end of the pulling tool. The buckle allows the duct plugger to be quickly connected and removed from the pulling tool, which is also a convenient and efficient operation method.

[0009] As a further optimization of the duct plugger, the inner core has an axially arranged threaded hole for threaded connection with the pull rod of the tensioning tool. This threaded connection allows the duct plugger to be driven by a common tensioning tool such as a rivet nut gun to perform duct plugging operations.

[0010] The present invention provides a method for manufacturing a duct occluder, comprising the following steps: Step C1: processing and manufacturing the inner core; Step C2: Processing and manufacturing a cylinder blank; the cylinder blank comprises a cylinder bottom at a distal end and a cylinder wall extending from an edge of the cylinder bottom toward a proximal end; the outer surface of the cylinder wall is at least partially processed into an outer conical surface; in a direction toward the proximal end, the radial dimension of the outer conical surface increases, and the thickness of the cylinder wall where the outer conical surface is located increases; Step C3: coaxially placing the inner core into the inner cavity of the tube blank so that the distal end of the inner core contacts the inner wall of the tube bottom; Step C4: placing the cylindrical blank equipped with the inner core on an extrusion die, wherein the extrusion die has a shaping channel and a bell-shaped shaping cone at the end of the shaping channel; Step C5: Use a push rod to apply axial thrust from the proximal end of the inner core to force the tube blank to enter the shaping cone and pass through the shaping channel. The shaping cone forces the tube wall to produce radial contraction deformation to form a pre-assembled body of the sealing sleeve and the inner core.

[0011] This manufacturing method uses an extrusion die to radially shrink and shape the cylindrical blank with a pre-set inner core, achieving integrated precision molding of the sealing sleeve and the inner core, simplifying the processing flow while ensuring the structural stability of the tapered mating surface, thereby guaranteeing production efficiency and product consistency.

[0012] As a further optimization, the push rod's end features a flat, annular force-applying surface, designed to contact the proximal end of the inner core. A protruding column protrudes from the force-applying surface in the center of the push rod and extends into the central hole of the inner core. This structure evenly transmits axial thrust and precisely positions the inner core, improving centering and force stability, thereby ensuring product quality.

[0013] As a further optimization solution, the radial dimension of the push rod is consistent with the radial dimension of the proximal end of the sealing sleeve, thereby determining the shrinkage dimension of the barrel blank and making the extrusion molding more precise.

[0014] As a further optimization solution, the angle ∠B between the center line of the shaping channel and the generatrix of the shaping cone is preferably in the range of 5° to 25°.

[0015] As a further optimization solution, a circular arc transition connection is made at the junction of the inner wall of the shaping channel and the surface of the shaping cone mouth, which reduces the friction resistance when the tube blank passes through, improves the stability of the tube blank when passing through, and improves the surface finish of the product.

[0016] The present invention also provides a method for manufacturing a duct plugger, which can efficiently and high-quality manufacture the above-mentioned duct plugger with a pull-off operation, and mainly comprises the following steps: Step D1: Processing and manufacturing an integrated connector with a rod-shaped portion and an inner core, and forming a breaking groove at the connection between the inner core and the rod-shaped portion; Step D2: Processing and manufacturing a cylinder blank; the cylinder blank comprises a cylinder bottom at a distal end and a cylinder wall extending from an edge of the cylinder bottom toward a proximal end; the outer surface of the cylinder wall is at least partially processed into an outer conical surface; in a direction toward the proximal end, the radial dimension of the outer conical surface increases, and the thickness of the cylinder wall where the outer conical surface is located increases; Step D3: coaxially inserting the inner core into the inner cavity of the tube blank, so that the distal end of the inner core contacts the inner wall of the tube bottom and the proximal end of the rod-shaped portion extends outside the opening of the tube blank; Step D4: placing the cylindrical blank equipped with the inner core on an extrusion die, wherein the extrusion die has a shaping channel and a bell-shaped shaping cone at the end of the shaping channel; Step D5: Apply axial thrust to the rod-shaped portion to force the cylinder blank into the shaping cone and pass through the shaping channel. The shaping cone forces the cylinder wall to produce radial contraction deformation, and pre-assemble the sealing sleeve and the inner core together. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the channel plugger in Example 1.

[0018] Figure 2 This is a schematic structural diagram of the sealing sleeve in Example 1.

[0019] Figure 3 This is a schematic structural diagram of the inner core in Example 1.

[0020] Figure 4 Schematic diagram of the structure of the blocked channel in Example 1.

[0021] Figure 5 Schematic diagram of the structure of the channel plugger in Example 2.

[0022] Figure 6 and Figure 7 Schematic diagram of the explosion of the channel plugger in Example 2.

[0023] Figure 8 This is a schematic diagram of the explosion of the channel plugger in Example 3.

[0024] Figure 9 Schematic diagram of the structure of the channel plugger in Example 3.

[0025] Figure 10 Schematic diagram of the structure of the duct plugger after expansion in Example 3.

[0026] Figure 11 This is a schematic structural diagram of the tube blank in Example 4.

[0027] Figure 12 This is a schematic diagram of the inner core and tube blank assembly placed in front of the extrusion die in Example 4.

[0028] Figure 13 Schematic diagram of the inner core and tube blank assembly placed in the extrusion die in Example 4.

[0029] Figure 14 Schematic diagram of the inner core and tube blank assembly passing through the extrusion die in Example 4.

[0030] Figure 15 This is a schematic diagram of placing the inner core with a rod-shaped portion and the tube blank assembly into an extrusion die in Example 5.

[0031] Figure 16 Schematic diagram of the inner core with the rod-shaped portion and the tube blank assembly passing through the extrusion die in Example 5.

[0032] Figure 17 This is a schematic structural diagram of the channel plugger in Example 6.

[0033] Figure 18 This is a schematic structural diagram of the sealing sleeve in Example 6.

[0034] Figure 19 This is a schematic structural diagram of the inner core in Example 6.

[0035] Figure 20 Schematic diagram of the structure of the duct plugger after expansion in Example 6.

[0036] Figure 21 Schematic diagram of the cooperation between the push rod and the channel plugger in Example 6.

[0037] Figure 22 It is a schematic diagram of the overall structure of the rivet nut gun 9.

[0038] Figure 23 This is a state diagram of step B1 in Example 6.

[0039] Figure 24 This is a state diagram of step B2 in Example 6.

[0040] Figure 25 This is a state diagram of step B3 in Example 6.

[0041] Figure 26 This is a state diagram of step B4 in Example 6.

[0042] Figure 27 This is a state diagram of step B5 in Example 6.

[0043] In the figure, 1. sealing sleeve; 2. inner core; 3. rod-shaped part; 4. tube blank; 5. extrusion die; 6. push rod; 8. tension rod; 9. rivet nut gun; 11. barrier end face; 12. extrusion side wall; 13. conical inner surface; 15. expansion surface; 21. conical outer surface; 22. threaded hole; 24. locking part; 31. breaking groove; 41. tube bottom; 42. tube wall; 51. shaping channel; 52. shaping cone mouth; 61. force application surface; 62. convex column; 63. boss; 81. raised part; 91. gun head; 92. threaded pull rod; 421. outer conical surface; 911. contact end face; 912. guide slope. DETAILED DESCRIPTION

[0044] The present invention is further illustrated below by means of specific examples. These examples are exemplary and are intended to illustrate the problem and explain the present invention, but are not intended to be limiting.

[0045] To facilitate description and understanding of the structure of the channel occluder, the proximal and distal ends are defined with reference to the user. The end exposed to the outside after blocking the channel, that is, the end facing the user, is the proximal end, and the end facing the internal medium in the channel is the distal end.

[0046] Example 1 like Figures 1 to 4 The illustrated device comprises a sealing sleeve 1, which can be inserted into a channel, and an inner core 2, which is pre-retained within the sleeve. Before the device is used to seal a channel, the inner core 2 is already assembled within the sleeve 1. To seal the channel, the inner core 2 is moved axially relative to the sleeve 1, causing the sleeve 1 to expand radially, compressing against the inner wall of the channel to be sealed, creating an interference fit and sealing effect.

[0047] The inner core 2 is preferably configured to have a higher hardness than the sealing sleeve 1, thereby having higher compressive strength and structural stability. When squeezed with the sealing sleeve 1, plastic deformation can be mainly generated in the sealing sleeve 1. Correspondingly, the sealing sleeve 1 is more easily deformed and, when subjected to the radial compression of the inner core 2, adaptively fits with the inner wall of the channel, thereby forming a continuous contact sealing interface in the circumferential direction.

[0048] like Figure 2 As shown, the sealing sleeve 1 is integrally formed, with a flat closed barrier end face 11 at its distal end and an opening at its proximal end. The extruded side wall 12 extends from the periphery of the barrier end face 11 to the proximal end to form a thin-walled tubular structure. The inner surface of the extruded side wall 12 is at least partially a conical inner surface 13, for example Figure 2 As shown in the figure, a conical inner surface 13 is formed near the distal end, and a cylindrical surface of constant diameter is formed near the proximal end. The thickness of the extruded sidewall 12 where the conical inner surface 13 is located increases from the distal end to the proximal end. The cavity formed by the barrier end surface 11 and the extruded sidewall 12 is used to pre-hold the inner core 2.

[0049] like Figure 3 As shown, the inner core 2 is approximately cylindrical in shape as a whole, and has an outer surface on the peripheral side, at least part of which is a conical outer surface 21, for example Figure 3 As shown in FIG, the outer surface thereof is basically a tapered outer surface 21, and the radial dimension of the tapered outer surface 21 decreases in the direction pointing to the proximal end.

[0050] like Figure 3 As shown, the inner core 2 has an axially arranged threaded hole 22 , which can be threadedly connected to a pulling tool so that the pulling tool applies axial pulling force to the inner core 2 .

[0051] The pore blocker forms a Figure 1In the pre-assembled state shown in FIG, a pulling tool is used to apply axial tension to the inner core 2. Under the action of the tension, the inner core 2 moves toward the proximal end relative to the sealing sleeve 1, causing the tapered outer surface 21 and the tapered inner surface 13 to produce a wedge-shaped extrusion, converting the axial tension into a radial expansion force, causing the sealing sleeve 1 to expand radially, squeezing the inner wall of the channel and blocking the channel, forming a Figure 4 The blocked state is shown.

[0052] Based on the above structure, the duct plugger can take into account high sealing reliability, convenient operation and clean sealing characteristics, as follows.

[0053] The channel plugger can achieve high-reliability sealing. As mentioned above, the channel plugger adopts a dual-component integrated design and only includes two main structures. In terms of the matching relationship, the tapered inner surface 13 of the sealing sleeve 1 forms a wedge-shaped fit with the tapered outer surface 21 of the inner core 2, and the radial expansion of the sealing sleeve 1 forms a continuous annular contact with the inner wall of the channel. This minimalist structural design reduces the number of matching interfaces, reduces the assembly verification links and potential failure points. In addition, the channel plugger only forms a single annular contact interface on the periphery, and uses the wedge-shaped extrusion effect between the conical surfaces to convert the axial tension into a radial expansion force that is amplified by dozens of times, so that the sealing sleeve 1 produces plastic deformation of the inner wall of the adaptive channel, forming a high-strength and high-density extrusion seal, reducing the risk of leakage, and is therefore suitable for long-term sealing under high-pressure conditions.

[0054] This duct plugger offers exceptional ease of use. It requires no on-site assembly and can be operated using only conventional tensioning tools, such as a rivet nut gun (9). It eliminates the need for step structures to prevent axial slippage or anti-rotation limiters within the duct, and can reliably seal an ordinary straight hole. Because the plugging operation is independent of any limiters within the duct or on the end face, it is easy to achieve different plugging states (flush, protruding, or retracted) relative to the duct end face, depending on actual needs.

[0055] The channel plugger has excellent clean sealing properties. The sealing sleeve 1 and the inner wall of the channel are sealed by radial extrusion. There is no relative friction between the two and no debris is generated. There is friction between the inner core 2 and the sealing sleeve 1 during axial movement. Even if a small amount of debris is generated, it is completely isolated outside the channel by the sealing sleeve 1, ensuring that the inside of the channel is free of debris and clean. After the plugging is completed, a regular plane can be formed towards the inside of the channel. There are no gaps or concave-convex structures on the surface, and it is not easy to harbor dirt. Therefore, the channel plugger can be used in scenarios such as hydraulic systems, medical equipment, food processing and sterile systems that have strict requirements on internal cleanliness.

[0056] Example 2 like Figure 5Compared to the solution in Example 1, the other channel occluder shown here does not have an axial threaded hole 22. Instead, it has a buckle provided on the inner core 2, which is operated using a tension tool having a snap portion that can be detachably connected to the buckle. This channel occluder also achieves high-reliability sealing, convenient operation, and ensures that the channel interior is clean and free of contamination.

[0057] like Figure 6 and Figure 7 As shown, a circumferential through-hole is formed in the center of the inner core 2, and a pair of clips protruding toward the central axis are provided on the inner wall of this through-hole, located at the proximal end. The tensioning tool comprises a cylindrical tension rod 8, which can rotate circumferentially and move axially. A protrusion 81 is formed on the side wall of the end of the tension rod 8. During operation, the end of the tension rod 8 is inserted into the through-hole in the center of the inner core 2 and rotated to an appropriate angle, such as 90°, so that the clip on the inner core 2 contacts the protrusion 81 on the tension rod 8. Pulling the tension rod 8 now causes the inner core 2 to move proximally relative to the sealing sleeve 1, causing the sealing sleeve 1 to expand radially.

[0058] Example 3 like Figures 8 and 9 Another channel occluder shown, compared with the solution of Example 1, has an inner core 2 without an axial threaded hole 22, but a rod-shaped portion 3 is integrally connected to the proximal end of the inner core 2, and the surface of the rod-shaped portion 3 is provided with anti-slip lines, and a circumferentially extending break groove 31 is formed at the connection between the inner core 2 and the rod-shaped portion 3. This channel occluder can be adapted to the operating instruments of the commonly used break-off channel occluder. During operation, the tension tool clamps the rod-shaped portion 3 to apply axial tension, so that the inner core 2 moves proximally relative to the sealing sleeve 1 until it breaks at the break groove 31. The inner core 2 moves proximally relative to the sealing sleeve 1, causing the sealing sleeve 1 to expand radially and squeeze against the inner wall of the channel to achieve sealing. At this time, the state of the channel occluder is as follows. Figure 10 Similarly, the duct plugging device can also take into account high-reliability sealing, convenient operation, and ensure that the interior of the duct is clean and pollution-free.

[0059] Example 4 This embodiment introduces a method for manufacturing a pore occluder, which can be used to manufacture the pore occluders of Embodiments 1 and 2, comprising the following steps: Step C1: manufacturing the inner core 2 by machining or material deformation according to the shape of the inner core 2; Step C2: Manufacturing the tube blank 4 by machining or material deformation; Figure 11 As shown, the cylindrical body has a distal bottom 41 and a cylindrical wall 42 extending from the edge of the cylindrical bottom 41 toward the proximal end; the outer surface of the cylindrical wall 42 is at least partially processed into an outer conical surface 421; in the direction pointing toward the proximal end, the radial dimension of the outer conical surface 421 increases, and the thickness of the cylindrical wall 42 where the outer conical surface 421 is located increases; Step C3: Figure 12 As shown, the inner core 2 is coaxially placed into the inner cavity of the cylinder blank 4 so that the distal end surface of the inner core 2 contacts the inner wall of the cylinder bottom 41; Step C4: Figure 13 As shown, the cylindrical blank 4 equipped with the inner core 2 is placed on the extrusion die 5. The extrusion die 5 has a cylindrical shaping channel 51 and a trumpet-shaped shaping cone 52 at the end of the shaping channel 51. Step C5: Figure 14 As shown, an axial thrust is applied from the proximal end of the inner core 2 using a push rod 6, forcing the tube blank 4 to enter the shaping cone 52 and pass through the shaping channel 51. The shaping cone 52 forces the tube wall 42 to produce radial contraction deformation, the outer cone 421 is compressed to form a cylindrical surface, and the inner surface of the tube blank 4 is compressed into at least a partial cone, ultimately obtaining a pre-assembled body of the sealing sleeve 1 and the inner core 2.

[0060] Preferably, the end edge of the push rod 6 has a flat annular force-applying surface 61, which is used to contact the proximal surface of the inner core 2, and can provide a stable and uniform thrust to the inner core 2; the center of the end of the push rod 6 has a boss 62 protruding from the force-applying surface 61, and the boss 62 can extend into the hole in the center of the inner core 2, so that the center of the push rod 6 and the center of the inner core 2 are basically in the same straight line, ensuring the stability of the thrust.

[0061] Preferably, the radial dimension of the push rod 6 is consistent with the radial dimension of the proximal end of the sealing sleeve 1. After being squeezed by the mold, the cylinder wall 42 shrinks inward and conflicts with the outer surface of the push rod 6, so that the radial dimension of the proximal end of the sealing sleeve 1 finally formed is consistent with the expected value.

[0062] Preferably, the included angle ∠B between the center line of the shaping channel 51 and the generatrix of the shaping cone 52 is in the range of 5° to 25°; more preferably, it is in the range of 6° to 22°, and even more preferably, it is in the range of 6.5° to 20°.

[0063] Preferably, the inner wall of the shaping channel 51 and the surface of the shaping cone 52 are connected by an arc transition, so that the tube blank 4 passes through more smoothly and the precision of the outer surface is improved.

[0064] Example 5 This embodiment introduces a method for manufacturing a pore occluder, which can be used to manufacture the pore occluder of Example 3, comprising the following steps: Step D1: manufacturing an integral connector with the rod-shaped portion 3 and the inner core 2 by machining or material deformation, and forming a breaking groove 31 at the connection between the inner core 2 and the rod-shaped portion 3; Step D2: Manufacturing the cylinder blank 4 by machining or material deformation; Figure 11As shown, the cylinder blank 4 has a cylinder bottom 41 at the distal end and a cylinder wall 42 extending from the edge of the cylinder bottom 41 toward the proximal end. The outer surface of the cylinder wall 42 is at least partially processed into an outer conical surface 421. In the direction toward the proximal end, the radial dimension of the outer conical surface 421 increases, and the thickness of the cylinder wall 42 where the outer conical surface 421 is located increases. Step D3: coaxially insert the inner core 2 into the inner cavity of the tube blank 4, so that the distal end of the inner core 2 contacts the inner wall of the tube bottom 41 and the proximal end of the rod-shaped portion 3 extends outside the opening of the tube blank 4; Step D4: Place the barrel 4 equipped with the inner core 2 on the extrusion die 5 to form Figure 15 In the state shown, the extrusion die 5 has a shaping channel 51, and a bell-shaped shaping cone 52 is provided at the end of the shaping channel 51; Step D5: Apply axial thrust to the rod-shaped portion 3 to force the tube blank 4 to enter the shaping cone 52 and pass through the shaping channel 51 to form Figure 16 In the state shown, the shaped conical opening 52 forces the cylinder wall 42 to produce radial contraction deformation, thereby pre-assembling the sealing sleeve 1 and the inner core 2 together.

[0065] Example 6 Further optimization is performed on the basis of the duct plugger of Example 1, such as Figures 17 to 20 As shown, the proximal edge of the inner core 2 has a proximally protruding locking portion 24. The proximal surface of the sealing sleeve 1 transitions to the inner surface of the extruded sidewall 12, forming a proximally open, bell-shaped expansion surface 15. When plugging the passage, the inner core 2 is pulled proximally with a tool, causing the proximal locking portion 24 to turn outward and squeeze against the bell-shaped expansion surface 15, forming an interlocking connection. This prevents the inner core 2 from slipping distally after plugging, significantly improving the stability of the connection between the inner core 2 and the sealing sleeve 1 and better adapting to harsh operating environments such as vibration and impact.

[0066] The manufacturing method of the duct occluder can be adopted from step C1 to step C5 in embodiment 4. In order to better match the shape of the proximal end of the inner core 2 so as to apply a uniform and stable thrust to the inner core 2, the end of the push rod 6 can be processed as follows Figure 21 In the structure shown, the edge of the end of the push rod 6 has a flat annular force-applying surface 61, which is used to abut against the locking portion 24 at the proximal end of the inner core 2; a boss 63 is formed on the force-applying surface 61, which abuts against the proximal surface within the range of the locking portion 24 on the inner core 2; a boss 62 is provided at the center of the end of the push rod 6, which protrudes from the boss 63, and the boss 62 can be extended into the hole in the center of the inner core 2, so that the center of the push rod 6 and the center of the inner core 2 are basically in the same straight line.

[0067] The duct plugger can also be operated by using a rivet nut gun 9, such as Figure 22As shown, a rivet nut gun 9 is a commonly used pulling tool in industry and can be operated by hand. The rivet nut gun 9 comprises a gun head 91 and a threaded pull rod 92. The threaded pull rod 92 can rotate circumferentially and extend axially relative to the gun head 91. The circumferential rotation of the threaded pull rod 92 allows for easy insertion into the threaded hole 22 of the inner core 2 for quick connection and quick removal from the threaded hole 22. The axial extension of the threaded pull rod 92 allows for easy application of axial force to the inner core 2, thereby pulling the inner core 2 within the sealing sleeve 1.

[0068] like Figure 14 As shown, the end of the gun head 91 of the rivet nut gun 9 has a contact end surface 911, which can be used to contact and support the proximal end of the sealing sleeve 1. Furthermore, to facilitate the interlocking between the locking portion 24 and the expansion surface 15, an annular guide slope 912 protruding toward the distal end can be formed on the contact end surface 911. The guide slope 912 can guide the radial expansion of the locking portion 24, so that it is squeezed into the gap between the guide slope 912 and the expansion surface 15, thereby achieving the eversion and locking of the locking portion 24.

[0069] For example, the method of using the rivet nut gun 9 to operate the duct plugger to plug the duct mainly includes the following steps: Step B1: Place the proximal end of the duct plugger against the gun head 91 of the rivet nut gun 9, so that the threaded rod 92 exposed from the gun head 91 contacts the proximal end of the threaded hole 22, forming a Figure 23 The status shown; Step B2: Start the rivet nut gun 9 to rotate the threaded rod 92 and screw it into the threaded hole 22 until the proximal end surface of the sealing sleeve 1 contacts the contact end surface 911 of the gun head 91, forming a Figure 24 The status shown; Step B3: Move the rivet nut gun 9 to place the hole plugger loaded at the gun head 91 into the hole to be plugged, with the distal end of the hole plugger facing the inside of the hole, forming a Figure 25 The status shown; Step B4: Start the rivet nut gun 9 to retract the threaded rod 92 relative to the gun head 91, pull the inner core 2 to move proximally relative to the sealing sleeve 1, and make the sealing sleeve 1 expand radially to fit with the inner wall of the channel, so that the locking portion 24 is at least partially squeezed into the gap formed between the guide slope 912 and the expansion surface 15, forming Figure 26 The status shown; Step B5: Start the rivet nut gun 9 to rotate the threaded rod 92 out of the threaded hole 22 to form Figure 27 The state shown completes the blocking of the channel.

[0070] Preferably, in step B3, the abutting end face 911 of the rivet nut gun 9 abuts against the end face of the duct opening. In this way, after the duct is blocked, the end face of the duct is flush with the end face of the duct plugger, which is more regular and beautiful. In addition, as needed, the abutting end face 911 of the rivet nut gun 9 can be moved a certain distance away from the end face of the duct opening, so that the duct plugger protrudes relative to the end face of the duct after blocking. Alternatively, a gun head 91 with a smaller radial dimension can be used as needed so that the gun head 91 can extend into the duct, so that the duct plugger retracts relative to the end face of the duct after blocking.

[0071] The above embodiments are exemplary and intended to illustrate the technical concepts and features of the present invention so that those skilled in the art can understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for manufacturing a duct plugger, characterized in that: The channel plugger comprises a sealing sleeve (1); the sealing sleeve (1) has a closed blocking end face (11) and an extruded side wall (12) extending from the edge of the blocking end face (11), and the proximal end of the sealing sleeve (1) has an opening; the inner surface of the extruded side wall (12) is at least partially a conical inner surface (13); in the direction toward the proximal end, the radial dimension of the conical inner surface (13) decreases, and the thickness of the extruded side wall (12) where the conical inner surface (13) is located increases; an inner core (2) is pre-retained in the cavity formed by the blocking end face (11) and the extruded side wall (12); the inner core (2) has a peripheral outer surface, at least partially a conical outer surface (21), and the radial dimension of the conical outer surface (21) decreases in the direction close to the proximal end; the inner core (2) has an axially arranged threaded hole (22); The manufacturing method comprises the following steps: Step C1: processing and manufacturing the inner core (2); Step C2: machining and manufacturing a cylinder blank (4); the cylinder blank (4) has a cylinder bottom (41) at the distal end and a cylinder wall (42) extending from the edge of the cylinder bottom (41) toward the proximal end; the outer surface of the cylinder wall (42) is at least partially machined into an outer conical surface (421); in a direction pointing toward the proximal end, the radial dimension of the outer conical surface (421) increases, and the thickness of the cylinder wall (42) where the outer conical surface (421) is located increases; Step C3: coaxially placing the inner core (2) into the inner cavity of the cylinder blank (4), so that the distal end surface of the inner core (2) contacts the inner wall of the cylinder bottom (41); Step C4: placing the cylindrical blank (4) equipped with the inner core (2) on an extrusion die (5), wherein the extrusion die (5) has a shaping channel (51) and a bell-shaped shaping cone (52) at the end of the shaping channel (51); Step C5: Using a push rod (6) to apply an axial thrust from the proximal end of the inner core (2), the cylinder blank (4) is forced to enter the shaping cone (52) and pass through the shaping channel (51). The shaping cone (52) forces the cylinder wall (42) to produce radial contraction deformation, thereby forming a pre-assembled body of the sealing sleeve (1) and the inner core (2).

2. The method for manufacturing a duct plugger according to claim 1, wherein: The end edge of the push rod (6) has a flat annular force-applying surface (61), and the force-applying surface (61) is used to contact the proximal end surface of the inner core (2); the center of the end of the push rod (6) has a convex column (62) protruding from the force-applying surface (61), and the convex column (62) can extend into the hole in the center of the inner core (2).

3. The method for manufacturing a duct plugger according to claim 1, wherein: The radial dimension of the push rod (6) is consistent with the radial dimension of the proximal end of the sealing sleeve (1).

4. The method for manufacturing a duct plugger according to claim 1, wherein: The included angle ∠B between the center line of the shaping channel (51) and the generatrix of the shaping cone opening (52) is within the range of 5° to 25°; the inner wall of the shaping channel (51) and the surface of the shaping cone opening (52) are connected in a circular arc transition at the junction.

5. A method for manufacturing a duct plugger, characterized in that: The channel plugging device comprises a sealing sleeve (1); the sealing sleeve (1) has a closed blocking end surface (11) and an extruded side wall (12) extending from the edge of the blocking end surface (11); the proximal end of the sealing sleeve (1) has an opening; the inner surface of the extruded side wall (12) is at least partially a conical inner surface (13); in the direction toward the proximal end, the radial dimension of the conical inner surface (13) decreases, and the thickness of the extruded side wall (12) where the conical inner surface (13) is located is The inner core (2) is pre-retained in the cavity formed by the barrier end surface (11) and the extruded side wall (12); the inner core (2) has a peripheral outer surface, at least part of which is a conical outer surface (21), and the radial dimension of the conical outer surface (21) decreases in the direction approaching the proximal end; the proximal end of the inner core (2) is integrally connected to a rod-shaped portion (3), and a circumferentially extending breaking groove (31) is formed at the connection between the inner core (2) and the rod-shaped portion (3); The manufacturing method comprises the following steps: Step D1: processing and manufacturing an integral connecting piece with a rod-shaped portion (3) and an inner core (2), and processing and forming a breaking groove (31) at the connection between the inner core (2) and the rod-shaped portion (3); Step D2: machining and manufacturing a cylinder blank (4); the cylinder blank (4) has a cylinder bottom (41) at the distal end and a cylinder wall (42) extending from the edge of the cylinder bottom (41) toward the proximal end; the outer surface of the cylinder wall (42) is at least partially machined into an outer conical surface (421); in a direction pointing toward the proximal end, the radial dimension of the outer conical surface (421) increases, and the thickness of the cylinder wall (42) where the outer conical surface (421) is located increases; Step D3: coaxially placing the inner core (2) into the inner cavity of the tube blank (4), so that the distal end surface of the inner core (2) contacts the inner wall of the tube bottom (41), and the proximal end of the rod-shaped portion (3) extends outside the opening of the tube blank (4); Step D4: placing the cylindrical blank (4) equipped with the inner core (2) on an extrusion die (5), wherein the extrusion die (5) has a shaping channel (51) and a bell-shaped shaping cone (52) at the end of the shaping channel (51); Step D5: applying an axial thrust to the rod-shaped portion (3) to force the cylinder blank (4) to enter the shaping cone (52) and pass through the shaping channel (51); the shaping cone (52) forces the cylinder wall (42) to produce radial contraction deformation, and pre-assembles the sealing sleeve (1) and the inner core (2) together.

6. A duct plugging device, characterized in that: The invention comprises a sealing sleeve (1) for being inserted into a hole; the sealing sleeve (1) has a closed barrier end surface (11) and an extruded side wall (12) extending from the edge of the barrier end surface (11); the proximal end of the sealing sleeve (1) has an opening; the inner surface of the extruded side wall (12) is at least partially a conical inner surface (13); in the direction toward the proximal end, the radial dimension of the conical inner surface (13) decreases, and the thickness of the extruded side wall (12) where the conical inner surface (13) is located increases; the barrier end surface (1 1) An inner core (2) is pre-retained in a cavity formed by being surrounded by the extrusion side wall (12); the inner core (2) has a peripheral outer surface, at least part of which is a conical outer surface (21), and the radial dimension of the conical outer surface (21) decreases in a direction approaching the proximal end; the inner core (2) can move toward the proximal end relative to the sealing sleeve (1) under the action of a pulling tool, causing the conical outer surface (21) to squeeze the conical inner surface (13), causing the sealing sleeve (1) to radially expand and squeeze the inner wall of the channel.

7. The pore plugging device according to claim 1, characterized in that: The inner core (2) has a buckle for detachably connecting with the end of the pulling tool.

8. The pore plugging device according to claim 1, characterized in that: The inner core (2) has an axially arranged threaded hole (22) for threaded connection with a pull rod of a pulling tool.

9. A duct plugging device, characterized in that: Prepared according to the manufacturing method according to any one of claims 1 to 5.

10. An application of a duct plugger in a clean sealing scenario, characterized by: The pore blocker is the pore blocker according to any one of claims 6 to 9, and the pore blocker is used to block pores in medical equipment, food processing production lines, biopharmaceutical systems or semiconductor manufacturing equipment.

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