Hole plugging device and manufacturing method thereof

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 and a manufacturing method thereof. 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 excellent operation convenience, has no pollution and damage to pore channels, and is especially suitable for high-pressure clean sealing scenes.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe system plugging accessories and pipe plugs, and particularly relates to a channel plugger and a manufacturing method thereof. Background Art

[0002] As a key sealing component of industrial equipment, the hole plugger is responsible for the sealing of process holes, oil / gas lines and high-pressure media in mechanical manufacturing, automobile industry and energy equipment. Its sealing reliability 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 ease of operation, such as the requirement to adapt to standard straight holes, ready-to-use characteristics without on-site assembly, and compatibility with general tools. In high-clean fields such as medical equipment, food processing production lines, biopharmaceutical systems and semiconductor manufacturing equipment, installation methods such as threading, tapping, and expansion are prone to metal debris, which poses a risk of contamination. Therefore, it is of great value to develop new plugging solutions that have high sealing performance, ease of operation and clean installation characteristics.

[0003] In the prior art, 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 process of developing new channel occluders, design schemes different from traditional structures 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

[0004] In view of the deficiencies in the prior art, the present invention provides a duct plugger and a manufacturing method thereof.

[0005] The first aspect of the present invention provides a channel plugger, including a sealing sleeve for inserting into a 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 peripheral outer surface, at least partially of which is a conical outer surface, and the radial dimension of the conical outer surface decreases in the direction close to the proximal end; the inner core can move toward the proximal end 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 plugger has the following beneficial effects: it can take into account high-reliability sealing, convenient operation, and ensure that the inside of the channel is clean and pollution-free.

[0006] As a further optimization solution for the channel occluder, the proximal end of the inner core is integrally connected with a rod-shaped portion, and a breakaway groove extending along the circumference is formed at the connection between the inner core and the rod-shaped portion. By presetting the rod-shaped portion and the breakaway groove, the channel occluder can also be used in conjunction with the operating instruments of the traditional breakaway channel occluder, without the need for separate design and matching operating instruments.

[0007] As a further optimization solution of the channel plugger, the inner core has a buckle for detachably connecting with the end of the pulling tool. The channel plugger can be quickly connected and disassembled with the pulling tool through the buckle, which is also a convenient and efficient operation method.

[0008] As a further optimization solution of the channel plugger, the inner core has an axially arranged threaded hole for threaded connection with the pull rod of the pulling tool. This threaded matching method enables the channel plugger to be driven by a common pulling tool rivet nut gun to perform channel plugging operations.

[0009] The second aspect of the present invention is to provide a method for manufacturing a pore occluder, comprising the following steps: Step C1: processing and manufacturing the inner core; Step C2: machining and manufacturing a cylinder blank; the cylinder blank has a cylinder bottom at the distal end and a cylinder wall extending from the edge of the cylinder bottom to the proximal end; the outer surface of the cylinder wall is at least partially machined into an outer cone; in the direction pointing to the proximal end, the radial dimension of the outer cone increases, and the thickness of the cylinder wall where the outer cone is located increases; Step C3: coaxially placing the inner core into the inner cavity of the tube blank so that the distal end surface of the inner core contacts the inner wall of the bottom of the tube; Step C4: placing the tube blank equipped with the inner core on an extrusion die, wherein the extrusion die has a shaping channel and a bell-shaped shaping cone is provided 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.

[0010] The manufacturing method radially shrinks and shapes the cylinder blank with a pre-set inner core through an extrusion die, thereby 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 ensuring production efficiency and product consistency.

[0011] As a further optimization solution, the edge of the push rod end has a flat annular force-applying surface, which is used to contact the proximal surface of the inner core; the center of the push rod end has a convex column protruding from the force-applying surface, which can extend into the hole in the center of the inner core. This structure allows the axial thrust to be evenly transmitted and the inner core to be accurately positioned, improving the centering and force-applying stability, and ensuring product quality.

[0012] 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 defining the shrinkage dimension of the barrel blank and making the extrusion molding more precise.

[0013] As a further optimization solution, the angle ∠B between the center line of the shaping channel and the generatrix of the shaping cone mouth is preferably in the range of 5°~25°.

[0014] As a further optimization solution, an arc transition connection is formed at the junction of the inner wall of the shaping channel and the surface of the shaping cone mouth, which reduces the friction resistance of the tube blank when it passes through, improves the stability of the tube blank when it passes through, and improves the surface finish of the product.

[0015] The second aspect of the present invention also provides a method for manufacturing a duct plugger, which can efficiently and high-quality manufacture the above-mentioned duct plugger of pull-off operation, mainly comprising the following steps: Step D1: processing and manufacturing an integrated connecting piece 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: machining and manufacturing a cylinder blank; the cylinder blank has a cylinder bottom at the distal end and a cylinder wall extending from the edge of the cylinder bottom to the proximal end; the outer surface of the cylinder wall is at least partially machined into an outer cone; in the direction pointing to the proximal end, the radial dimension of the outer cone increases, and the thickness of the cylinder wall where the outer cone is located increases; Step D3: coaxially placing the inner core into the inner cavity of the tube blank, so that the distal end surface of the inner core abuts against 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 barrel blank equipped with the inner core on an extrusion die, wherein the extrusion die has a shaping channel and a bell-shaped shaping cone is provided at the end of the shaping channel; Step D5: Apply axial thrust to the rod-shaped portion to force the cylinder blank to enter the shaping cone and pass through the shaping channel. The shaping cone forces the cylinder wall to produce radial contraction deformation to pre-assemble the sealing sleeve and the inner core together. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the channel plugger in Example 1.

[0017] Figure 2 This is a schematic diagram of the structure of the sealing sleeve in Example 1.

[0018] Figure 3 This is a schematic diagram of the structure of the inner core in Example 1.

[0019] Figure 4 This is a schematic diagram of the structure of the blocked channel in Example 1.

[0020] Figure 5 This is a schematic diagram of the structure of the channel plugger in Example 2.

[0021] Figure 6 and Figure 7 This is a schematic diagram of the explosion of the channel plugger in Example 2.

[0022] Figure 8 This is a schematic diagram of the explosion of the channel plugger in Example 3.

[0023] Fig. 9 This is a schematic diagram of the structure of the channel plugger in Example 3.

[0024] Fig.10 This is a schematic diagram of the structure of the channel plugger after expansion in Example 3.

[0025] Fig.11 It is a schematic diagram of the structure of the tube blank in Example 4.

[0026] Fig.12 This is a schematic diagram of the inner core and tube blank assembly in Example 4 being placed in front of the extrusion die.

[0027] Fig.13 This is a schematic diagram of placing the inner core and tube blank assembly in the extrusion die in Example 4.

[0028] Fig.14 Schematic diagram of the inner core and tube blank assembly passing through the extrusion die in Example 4.

[0029] Fig.15 This is a schematic diagram of placing the inner core with a rod-shaped portion and the tube blank assembly in Example 5 into an extrusion die.

[0030] Fig.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.

[0031] Fig.17 This is a schematic diagram of the structure of the channel plugger in Example 6.

[0032] Fig.18 This is a schematic diagram of the structure of the sealing sleeve in Example 6.

[0033] Fig.19 This is a schematic diagram of the structure of the inner core in Example 6.

[0034] Fig. 20 This is a schematic diagram of the structure of the channel plugger after expansion in Example 6.

[0035] Fig.21 Schematic diagram of the cooperation between the push rod and the channel plugger in Example 6.

[0036] Fig. 22 It is a schematic diagram of the overall structure of the rivet nut gun 9.

[0037] Fig.23 This is a state diagram of step B1 in Example 6.

[0038] Fig.24 This is a state diagram of step B2 in Example 6.

[0039] Fig.25 This is a state diagram of step B3 in Example 6.

[0040] Fig.26 This is a state diagram of step B4 in Example 6.

[0041] Fig. 27 This is a state diagram of step B5 in Example 6.

[0042] 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 cone surface; 911, contact end face; 912, guide slope surface. DETAILED DESCRIPTION

[0043] The present invention is further illustrated by specific examples below. These examples are exemplary and are intended to illustrate the problem and explain the present invention, but are not intended to be limiting.

[0044] To facilitate description and understanding of the structure of the channel occluder, the proximal end and the distal end 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.

[0045] Example 1 like Figures 1 to 4 The hole plugger shown comprises a sealing sleeve 1 that can be inserted into the hole and an inner core 2 pre-retained in the sealing sleeve 1. Before the hole plugger is used to plug the hole, the inner core 2 has been assembled in the sealing sleeve 1 to form an assembly. When plugging the hole, the inner core 2 is moved axially relative to the sealing sleeve 1, so that the sealing sleeve 1 expands radially and squeezes against the inner wall of the hole to be plugged, forming an interference fit sealing effect.

[0046] The inner core 2 is preferably configured to have a higher hardness than the sealing sleeve 1, so as to have higher compressive strength and structural stability, and when it is squeezed with the sealing sleeve 1, the plastic deformation can be mainly generated in the sealing sleeve 1. Correspondingly, the sealing sleeve 1 is easier to deform, and when subjected to the radial squeezing effect of the inner core 2, it can adaptably fit with the inner wall of the channel, thereby forming a continuous contact sealing interface in the circumferential direction.

[0047] like Figure 2 As shown, the sealing sleeve 1 is integrally formed, and its distal end has a flat closed barrier end face 11, and its proximal end is provided with an opening, and 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 equal diameter is formed near the proximal end. The thickness of the extruded side wall 12 where the conical inner surface 13 is located increases from the distal end to the proximal end; the cavity surrounded by the barrier end surface 11 and the extruded side wall 12 is used to pre-hold the inner core 2.

[0048] like Figure 3 As shown, the inner core 2 is generally cylindrical and has an outer surface on the circumference, at least part of which is a conical outer surface 21, for example Figure 3 As shown in FIG. 1 , the outer surface thereof is basically a conical outer surface 21, and the radial dimension of the conical outer surface 21 decreases in the direction pointing to the proximal end.

[0049] like Figure 3 As shown, the inner core 2 has an axially arranged threaded hole 22 , and the threaded hole 22 can be threadedly connected with a pulling tool so that the pulling tool applies axial pulling force to the inner core 2 .

[0050] The pore plugger forms a Figure 1In the pre-assembled state shown in the figure, a pulling tool is used to apply axial pulling force to the inner core 2. Under the action of the pulling force, 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 pulling force into a radial expansion force, causing the sealing sleeve 1 to expand radially, squeeze the inner wall of the channel, and block the channel, forming a Figure 4 The blocked state is shown.

[0051] Based on the above structure, the channel plugger can take into account high sealing reliability, convenient operation and clean plugging characteristics, as follows.

[0052] 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 match with the tapered outer surface 21 of the inner core 2, and the sealing sleeve 1 radially expands outside to form a continuous annular contact with the inner wall of the channel. This minimalist structural design reduces the number of matching interfaces, reduces assembly verification links and potential failure points. In addition, the channel plugger only forms a single annular contact interface on the periphery, and utilizes 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.

[0053] The hole plugger has excellent operation convenience. When in use, it does not need to be assembled on site, and the operation can be completed using only conventional pulling tools, such as a rivet nut gun 9. There is no need to process a step structure to prevent axial slippage or set an anti-rotation limit structure in the hole, and an ordinary straight hole can complete reliable sealing. Since the plugging operation does not rely on any limit structure inside the hole or on the end face, it is easy to achieve different plugging states of the hole plugger such as flush, protruding, and retracted relative to the end face of the hole according to actual needs.

[0054] 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 movement between the two, and no debris is generated. There is friction between the inner core 2 and the sealing sleeve 1 when moving axially. 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 toward the inside of the channel, with no gaps or concave-convex structures in the surface, and it is not easy to hide 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.

[0055] Example 2 like Figure 5Compared with the solution of Example 1, the inner core 2 of another channel plugger shown is not provided with an axial threaded hole 22, but a buckle is provided on the inner core 2, and a pulling tool with a clamping part that can be detachably connected to the buckle is used for operation. The channel plugger can also take into account high-reliability sealing, convenient operation, and ensure that the inside of the channel is clean and pollution-free.

[0056] like Figure 6 and Figure 7 As shown, a circumferential through hole is opened in the center of the inner core 2, and a pair of buckles protruding toward the central axis are provided on the inner wall of the through hole and at the proximal end; the tension tool has a columnar tension rod 8, which can rotate circumferentially and move axially, and 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 at a suitable angle, such as 90°, so that the buckle on the inner core 2 and the protrusion 81 on the tension rod 8 are in conflict. At this time, pulling the tension rod 8 can make the inner core 2 move toward the proximal end relative to the sealing sleeve 1, causing the sealing sleeve 1 to expand radially.

[0057] Example 3 like Figures 8 to 9 Compared with the solution of Example 1, the other channel occluder shown in the figure does not have an axial threaded hole 22 provided on the inner core 2. Instead, a rod-shaped portion 3 is integrally connected to the proximal end of the inner core 2. The surface of the rod-shaped portion 3 is provided with anti-slip patterns, 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-type channel occluder. During operation, the pulling tool clamps the rod-shaped portion 3 to apply axial pulling force, 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, so that the sealing sleeve 1 expands radially and squeezes against the inner wall of the channel to achieve blocking. At this time, the state of the channel occluder is as follows. Fig.10 Similarly, the pore plugging device can also take into account high-reliability sealing, convenient operation, and ensure that the inside of the pore is clean and pollution-free.

[0058] Example 4 This embodiment introduces a method for manufacturing a pore blocker, which can be used to manufacture the pore blockers of Embodiment 1 and Embodiment 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; Fig.11 As shown, it has a distal bottom 41 and a wall 42 extending from the edge of the bottom 41 toward the proximal end; the outer surface of the wall 42 is at least partially processed into an outer conical surface 421; in the direction pointing to the proximal end, the radial dimension of the outer conical surface 421 increases, and the thickness of the wall 42 where the outer conical surface 421 is located increases; Step C3: Fig.12 As shown, the inner core 2 is coaxially placed into the inner cavity of the tube blank 4, so that the distal end surface of the inner core 2 abuts against the inner wall of the tube bottom 41; Step C4: Fig.13 As shown, the tube blank 4 equipped with the inner core 2 is placed on the extrusion die 5, and the extrusion die 5 has a columnar shaping channel 51, and a trumpet-shaped shaping cone 52 is provided at the end of the shaping channel 51; Step C5: Fig.14 As shown, a push rod 6 is used to apply an axial thrust from the proximal end of the inner core 2, 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, finally obtaining a pre-assembled body of the sealing sleeve 1 and the inner core 2.

[0059] 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 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, 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.

[0060] 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.

[0061] Preferably, the 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°.

[0062] 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.

[0063] Example 5 This embodiment introduces a method for manufacturing a pore occluder, which can be used to manufacture the pore occluder of Embodiment 3, comprising the following steps: Step D1: manufacturing an integral connecting piece 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 tube blank 4 by machining or material deformation; Fig.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 to 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 pointing to 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 surface of the inner core 2 abuts against the inner wall of the tube bottom 41, and the proximal end of the rod-shaped portion 3 extends to the outside of the opening of the tube blank 4; Step D4: placing the tube blank 4 equipped with the inner core 2 on the extrusion die 5 to form Fig.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, forcing the tube blank 4 to enter the shaping cone 52 and pass through the shaping channel 51 to form Fig.16 In the state shown, the shaped conical mouth 52 forces the cylinder wall 42 to produce radial contraction deformation, and the sealing sleeve 1 and the inner core 2 are preassembled together.

[0064] Example 6 Further optimization is performed on the basis of the pore blocker of Example 1, such as Figures 17 to 20 As shown, the edge of the proximal surface of the inner core 2 has a locking portion 24 protruding toward the proximal end; the proximal surface of the sealing sleeve 1 is transitionally connected to the inner surface of the extruded side wall 12, forming a trumpet-shaped expansion surface 15 open toward the proximal end. When plugging the channel, the inner core 2 is pulled toward the proximal end by a tool, and the locking portion 24 at the proximal end of the inner core 2 is turned outward and squeezed with the trumpet-shaped expansion surface 15 to form an interlocking, preventing the inner core 2 from sliding toward the distal end after plugging, significantly improving the connection stability between the inner core 2 and the sealing sleeve 1, and better adapting to harsh use environments such as vibration and impact.

[0065] The manufacturing method of the duct plugging device can be adopted by the method of 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 Fig.21 In the structure shown, the edge of the end of the push rod 6 has a flat annular force-applying surface 61, and the force-applying surface 61 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 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.

[0066] The duct plugging device can also be operated by using a rivet nut gun 9, such as Fig. 22As shown, the rivet nut gun 9 is a common pulling tool in industry and can be hand-held. The rivet nut gun 9 has a gun head 91 and a threaded pull rod 92, and the threaded pull rod 92 can rotate circumferentially and retract axially relative to the gun head 91. The threaded pull rod 92 can be conveniently screwed into the threaded hole 22 of the inner core 2 to achieve quick connection, and can be quickly screwed out of the threaded hole 22; the threaded pull rod 92 can be conveniently extended axially to apply axial force to the inner core 2 to pull the inner core 2 in the sealing sleeve 1 to move.

[0067] like Fig.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. Further, in order 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 also be formed on the contact end surface 911. The guide slope 912 can guide the locking portion 24 to expand radially, so that it is squeezed and filled into the gap between the guide slope 912 and the expansion surface 15, so as to realize the eversion and locking of the locking portion 24.

[0068] Exemplarily, 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 channel plugger directly against the gun head 91 of the rivet nut gun 9, so that the threaded rod 92 exposed from the gun head 91 abuts against the proximal end of the threaded hole 22 to form a Fig.23 The status shown; Step B2: Start the rivet nut gun 9 to rotate the threaded pull 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 Fig.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 Fig.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 toward the proximal end relative to the sealing sleeve 1, so that the sealing sleeve 1 expands radially and fits with the inner wall of the channel, so that the locking portion 24 is at least partially squeezed and filled into the gap formed between the guide slope 912 and the expansion surface 15, forming Fig.26 The status shown; Step B5: Start the rivet nut gun 9 to rotate the threaded pull rod 92 out of the threaded hole 22 to form Fig. 27 The state shown completes the blocking of the channel.

[0069] Preferably, in step B3, the abutting end face 911 of the rivet nut gun 9 abuts against the end face where the hole opening is located, so that the end face where the hole is located after blocking is flush with the end face of the hole plugger, which is more regular and beautiful. In addition, the abutting end face 911 of the rivet nut gun 9 can also be made to be a certain distance away from the end face where the hole opening is located, so that the hole plugger after blocking is protruding relative to the end face where the hole is located; the gun head 91 with a smaller radial size can also be used as needed, so that the gun head 91 can be extended into the hole, so that the hole plugger after blocking is retracted relative to the end face where the hole is located.

[0070] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with the technology in this field can understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A pore 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) and the cavity formed by the extrusion side wall (12), in which an inner core (2) is pre-retained; 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 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), so that the sealing sleeve (1) radially expands and squeezes the inner wall of the hole.

2. The pore plugging device according to claim 1, characterized in that: The proximal end of the inner core (2) is integrally connected with a rod-shaped portion (3), and a breaking groove (31) extending in a circumferential direction is formed at the connection between the inner core (2) and the rod-shaped portion (3).

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

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

5. The method for manufacturing the pore plugging device according to claim 4, characterized in that: The following steps are involved: Step C1: processing and manufacturing the inner core (2); Step C2: machining and manufacturing a cylinder blank (4); the cylinder blank (4) comprises a cylinder bottom (41) at a 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 tube blank (4), so that the distal end surface of the inner core (2) abuts against the inner wall of the tube bottom (41); Step C4: placing the tube 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) is provided 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), wherein 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).

6. The method for manufacturing the pore plugging device according to claim 5, characterized in that: 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 abut against the proximal end surface of the inner core (2); the end of the push rod (6) has a convex column (62) protruding from the force-applying surface (61) at the center, and the convex column (62) can extend into the hole at the center of the inner core (2).

7. The method for manufacturing the pore plugging device according to claim 5, characterized in that: The radial dimension of the push rod (6) is consistent with the radial dimension of the proximal end of the sealing sleeve (1).

8. The method for manufacturing the pore plugging device according to claim 5, characterized in that: The included angle ∠B between the center line of the shaping channel (51) and the generatrix of the shaping cone opening (52) is in the range of 5° to 25°.

9. The method for manufacturing the pore plugging device according to claim 8, characterized in that: 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.

10. The method for manufacturing the pore plugging device according to claim 2, characterized in that: The following steps are involved: Step D1: manufacturing an integral connecting piece with a rod-shaped portion (3) and an inner core (2), 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) comprises a cylinder bottom (41) at a 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) abuts against 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 barrel 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) is provided 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, thereby pre-assembling the sealing sleeve (1) and the inner core (2) together.

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