Sealing plug structure and bridge

Abstract

The invention provides a sealing plug structure and a bridge. The sealing plug structure comprises a rubber base body and a supporting framework, and a wire hole is formed in the rubber base body in a penetrating mode. The supporting framework is arranged in the rubber base body in the axial direction of the wire hole, and the supporting framework surrounds the wire hole so as to provide supporting force of the wire hole in the radial direction. According to the sealing plug structure, the supporting framework is axially arranged in the rubber base body, the problem that in the prior art, sealing fails due to the fact that a single rubber base body is pressed and prone to deformation is solved, and the overall rigidity of the sealing plug structure and the capacity of resisting deformation caused by external loads are improved; meanwhile, the arranged supporting framework surrounds the inner wire hole, large radial force supporting is provided for the interior of the sealing plug, the anti-disengagement function is achieved under the condition that no extra assembly limiting parts are additionally arranged, and the sealing stability of the interior of the wire hole is improved. The bridge comprises the sealing plug structure and has all the beneficial effects.

Description

Technical Field

[0001] The present invention relates to the field of sealing technology, and in particular to a sealing plug structure and an electric bridge. Background Art

[0002] At present, the most commonly used design for wiring harness through cylinder connection is the through cylinder design, such as Figure 1 As shown, the wiring harness can be connected from the inside and outside of the electric bridge housing, that is, from the oil cavity to the air cavity, but the structure is extremely complex, expensive, and the assembly cycle is greatly increased, resulting in a sharp increase in costs. Some research technologies have proposed a cylinder sealing solution with integrated wiring harness injection, such as Figure 2 As shown in the figure, due to the thermal expansion and contraction of the wiring harness outer skin and the sealant under high and low temperature working conditions, a gap is likely to appear between the wiring harness outer skin and the injection glue, resulting in leakage. Some research technologies have proposed a cylinder sealing solution for the wiring harness sealing plug, such as Figure 3 As shown, this solution solves the leakage caused by thermal expansion and contraction under high and low temperature working conditions by using the interference fit between the wiring harness and the rubber. However, since the seal between the sealing plug and the shell is completely limited by the compression deformation force of the rubber, if the pressure difference is large, the pressure exceeds the compression deformation force of the rubber, and the sealing plug is at risk of being rushed out.

[0003] Therefore, the sealing plug structure in the related art cannot meet the problem of elastic sealing reliability of its structural body. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a sealing plug structure and an electrical bridge to solve the related problems in the prior art.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a sealing plug structure, comprising:

[0006] A rubber base body, wherein a wire hole is provided through the rubber base body;

[0007] A support frame is arranged inside the rubber matrix along the axial direction of the wire hole, and the support frame surrounds the wire hole to provide support force for the wire hole in the radial direction.

[0008] Optionally, the support frame is a rotating body structure, and the interior of the support frame is hollow.

[0009] Optionally, the rubber matrix is ​​a body of revolution structure, and the rubber matrix includes a sealing portion and a clamping portion along the axial direction, the sealing portion and the clamping portion have different diameters, and the support skeleton is arranged inside the sealing portion;

[0010] The outer peripheral surface of the sealing portion is a sealing surface, and the outer peripheral surface of the clamping portion is a clamping positioning surface.

[0011] Optionally, the rotation diameter of the clamping portion is smaller than the rotation diameter of the sealing portion.

[0012] Optionally, a ring-shaped reinforcing plate is provided on one side of the support frame close to the clamping portion, and the reinforcing plate itself encloses a connecting hole, and the clamping portion passes through the connecting hole and is connected to the sealing portion.

[0013] Optionally, the rubber matrix completely wraps the supporting skeleton.

[0014] Optionally, a sealing lip is provided in the wire hole, and the sealing lip is annularly protruding on the hole wall of the wire hole. The aperture of the lip of the sealing lip is smaller than the aperture of the wire hole, and the wiring harness passes through the lip of the sealing lip and has an interference fit with the sealing lip to achieve sealing.

[0015] Optionally, the cross-sectional shape of the sealing lip is trapezoidal, semicircular, teardrop-shaped or semi-elliptical.

[0016] Optionally, at least two sealing lips are provided in the wire hole, and the sealing lips are arranged inside the wire hole at intervals.

[0017] The present application further discloses an electric bridge, which includes any of the above-mentioned sealing plug structures.

[0018] As described above, the sealing plug structure and the electrical bridge of the present invention have at least the following beneficial effects, including but not limited to:

[0019] 1. The sealing plug structure of the present invention is axially arranged within the rubber matrix through a support frame, which solves the sealing failure problem of the conventional technology that the sealing plug may fall out due to the small deformation force of the single rubber matrix, thereby improving the robustness of the sealing plug against pressure differentials. At the same time, the support frame is arranged to surround the internal wire hole, providing a large radial force support for the interior of the sealing plug, achieving the anti-fallout function without relying on additional assembly limit parts, and improving the sealing stability of the sealing plug. Therefore, by providing a composite structure of the support frame and the rubber matrix, the present invention solves the problem that a sealing plug structure with a single rubber matrix cannot achieve both elastic sealing and anti-fallout properties. It realizes the synergy between the elastic sealing and rigid support functions of the sealing plug structure, ensuring the reliability of the seal.

[0020] 2. The rubber base of the present invention can be provided with a sealing portion and a clamping portion in the axial direction. The sealing portion, in conjunction with the support frame, significantly increases the interference fit between the sealing plug structure and the external housing, reducing the risk of seal disengagement. The clamping surface of the clamping portion can also serve as the clamping surface of the tooling. The present invention eliminates the potential sealing failure problem caused by the sealing surface of the sealing plug mechanism also serving as the clamping surface in conventional technologies by zoning the functional surface areas of the sealing plug structure.

[0021] 3. In the present invention, a raised sealing lip is provided in the wire hole inside the rubber matrix, and the aperture of the wire hole becomes smaller at the position passing through the sealing lip. During the assembly process, the wire harness passes through the lip opening of the sealing lip and has an interference fit with the sealing lip to achieve a corresponding internal sealing effect. At the same time, a plurality of sealing lips arranged at intervals can be provided, which can not only further enhance the sealing effect, but also form multiple fulcrums at the contact point of each sealing lip. The structure similar to a multi-point support can reduce the local bending stress of the wire harness, thereby helping to maintain the straightness of the wire harness, thereby providing a straightening effect when the wire harness is bent to ensure the stability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic structural diagram of a multi-component assembled cylinder-piercing member in the related art;

[0023] Figure 2 Shown is a schematic diagram of the structure of the cylinder seal with integrated glue injection of the wiring harness in the related art;

[0024] Figure 3 Shown is a schematic structural diagram of a cylinder seal of a wiring harness sealing plug in the related art;

[0025] Figure 4 Shown is one of the structural schematic diagrams of the sealing plug structure provided in an embodiment of the present application;

[0026] Figure 5 Showing the second structural schematic diagram of the sealing plug structure provided by an embodiment of the present application;

[0027] Figure 6 Shown is a schematic structural diagram of a support frame provided in an embodiment of the present application;

[0028] Figure 7 Shown is a schematic diagram of the coordination between the wiring harness and the wire hole provided in an embodiment of the present application;

[0029] Figure 8 Shown is a schematic structural diagram of the sealing lip provided in an embodiment of the present application.

[0030] Icon: 01. Wiring harness, 1. Rubber base, 2. Wire hole, 3. Support frame, 4. Sealing part, 5. Clamping part, 6. Reinforcement plate, 7. Connection hole, 8. Sealing lip. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0032] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0033] Please refer to Figure 4-Figure 7 The present application discloses a sealing plug structure, including a rubber base 1 and a support skeleton 3, wherein a wire hole 2 is provided through the rubber base 1; the support skeleton 3 is arranged inside the rubber base 1 along the axial direction of the wire hole 2, and the support skeleton 3 surrounds the wire hole 2 to provide support force for the wire hole 2 in the radial direction.

[0034] It should be noted that the wire hole 2 provided within the sealing plug structure is used for assembling the wiring harness 01, through which the wiring harness 01 passes. The high elasticity of the rubber matrix 1 allows it to adapt well to irregular contact surfaces, which is important for maintaining the tightness of the sealing interface. During an interference fit, the elastic deformation of the rubber fills small gaps and prevents leakage.

[0035] It is worth noting that the sealing plug structure is axially arranged inside the rubber matrix 1 through the support skeleton 3, which improves the overall rigidity of the sealing plug structure and its ability to resist deformation caused by external loads; at the same time, the support skeleton 3 is arranged to surround the internal wire hole 2, providing a large radial force support for the inside of the sealing plug, and realizes the anti-escape function without relying on additional assembly limiting parts, thereby increasing the sealing stability inside the wire hole 2; therefore, the present invention solves the problem that the sealing plug structure is difficult to take into account both elastic sealing and strength by setting a composite structure of the support skeleton 3 and the rubber matrix 1, realizes the functional coordination of the elastic sealing and rigid support of the sealing plug structure, and ensures the reliability of the seal.

[0036] Please refer to Figure 6 The support frame 3 is a rotating body structure, and the interior of the support frame 3 is hollow.

[0037] It is worth noting that the support frame 3 is set as a rotating body structure, which can make the radial support provided by the support frame 3 more uniform at each position in the circumferential direction, and the support effect is better. The internal hollow setting of the support frame 3 can serve as the channel position of the wire hole 2 of the wire harness 01, while reducing the weight and volume of the support frame 3, ensuring the lightweight structure and cost optimization.

[0038] Please refer to Figure 4 and Figure 5 The rubber matrix 1 is a rotating body structure, and the rubber matrix 1 includes a sealing portion 4 and a clamping portion 5 along the axial direction. The diameters of the sealing portion 4 and the clamping portion 5 are different, and the support skeleton 3 is arranged inside the sealing portion 4; the outer peripheral surface of the sealing portion 4 is the sealing surface, and the outer peripheral surface of the clamping portion 5 is the clamping positioning surface.

[0039] It is worth noting that the rubber matrix 1 can be provided with a sealing portion 4 and a clamping portion 5 in the axial direction. The sealing portion 4 significantly increases the interference fit force between the sealing plug structure and the external shell with the cooperation of the supporting skeleton 3, effectively solving the risk of seal disengagement. The clamping positioning surface of the clamping portion 5 provided can be used as the clamping positioning surface of the tooling. By partitioning the sealing portion 4 and the clamping portion 5 of the sealing plug structure, the potential sealing failure problem caused by the sealing surface of the sealing plug mechanism in the traditional technology being used as the clamping positioning surface at the same time is solved. The design of the differentiated diameters of the sealing portion and the clamping portion forms a stepped structure. The clamping tooling only acts on the clamping portion 5 to avoid mechanical damage to the sealing surface. By partitioning the sealing portion 4 and the clamping portion 5, the rigid support of the supporting skeleton 3 and the adaptation of the stepped diameter, the sealing reliability, pressure difference resistance and assembly efficiency are improved, which is significantly better than the integrated sealing plug structure.

[0040] Optionally, the rotation diameter of the clamping portion 5 is smaller than the rotation diameter of the sealing portion 4. Specifically, the outer diameter of the clamping portion 5 is smaller than the outer diameter of the sealing portion 4, forming a stepped structure. The tooling only acts on the clamping portion 5. At the same time, the small-sized structural design of the clamping portion 5 can meet the requirements of lightweighting and cost reduction, avoiding the problem of redundant material use and increased cost when the clamping portion 5 and the sealing portion 4 are designed to be the same size.

[0041] Please refer to Figure 4-Figure 6 The support frame 3 is provided with a ring-shaped reinforcing plate 6 on one side close to the clamping portion 5. The reinforcing plate 6 itself encloses a connecting hole 7. The clamping portion 5 passes through the connecting hole 7 and is connected to the sealing portion 4.

[0042] It's worth noting that the sealing portion 4 and the clamping portion 5 in the sealing plug structure each bear forces of different nature and magnitude, making their relative connection susceptible to damage over time. The reinforcing plate 6, located between the sealing portion 4 and the clamping portion 5 on the side of the support frame 3 near the clamping portion 5, significantly enhances the structural connection rigidity and long-term stability. Optionally, the reinforcing plate 6 and the support frame 3 can be integrally formed, with their combined cross-section forming an L-shape.

[0043] In some embodiments, the support skeleton 3 and the rubber matrix 1 are made through a two-stage vulcanization process, and the rubber matrix 1 completely wraps the support skeleton 3. It is understandable that in the present application, the metal skeleton and the rubber matrix 1 are first preliminarily bonded through the first vulcanization process to ensure the interface bonding strength, and then the rubber layer is further wrapped and cured through the secondary vulcanization, thereby achieving the beneficial effects of improving the structural integrity of the sealing plug body, enhancing the sealing reliability, and optimizing the process stability, solving the problem of weak bonding between the rubber and the support skeleton 3 and easy failure of the sealing interface, while taking into account the characteristics of lightweight and high strength, significantly improving the service life, stability and assembly efficiency of the sealing plug under high pressure and wide temperature range working conditions.

[0044] In some embodiments, the support frame 3 is made of metal. It is understood that metal has the following properties: first, it has mechanical advantages. Its high strength and rigidity provide excellent radial stiffness, ensuring radial support for the wire hole 2; second, it has a certain degree of creep resistance, preventing seal failure caused by long-term pressure; and third, it has a certain degree of environmental tolerance, good corrosion resistance and wide temperature range stability, ensuring the stability of the sealing plug structure.

[0045] Optionally, the support frame 3 is made of SPCC material. SPCC material is a cold-rolled carbon steel plate. It has excellent yield strength and elongation, combining high strength and plasticity, achieving lightweight support frame 3 while maintaining structural rigidity. The support frame 3 can also be made of other metal materials that meet the corresponding technical requirements, and detailed description is not provided here.

[0046] In some embodiments, the rubber substrate 1 is made of ACM, AEM, or FKM. These materials correspond to acrylate rubber, ethylene acrylate rubber, and fluororubber, respectively. All of these materials exhibit high-temperature resistance, corrosion resistance, and aging resistance, meeting the performance requirements of sealing materials. The rubber substrate 1 may also be made of other types of rubber, as long as they meet the corresponding application requirements. This is not intended to be a complete limitation.

[0047] Please refer to Figure 7 and Figure 8A sealing lip 8 is provided in the wire hole 2, and the sealing lip 8 is circumferentially protruded on the hole wall of the wire hole 2. The aperture of the lip of the sealing lip 8 is smaller than the aperture of the wire hole 2. The wiring harness 01 passes through the lip of the sealing lip 8 and is interference fit with the sealing lip 8 to achieve sealing.

[0048] It is worth noting that a raised sealing lip 8 is provided in the wire hole 2 inside the rubber matrix 1. The aperture of the wire hole 2 becomes smaller at the position passing through the sealing lip 8. During the assembly process, the wiring harness 01 passes through the lip of the sealing lip 8 and has an interference fit with the sealing lip 8 to achieve the corresponding internal sealing effect.

[0049] Optionally, the cross-sectional shape of the sealing lip 8 is trapezoidal, semicircular, teardrop-shaped or semi-elliptical.

[0050] Specifically, the sealing lip 8, with its trapezoidal, semicircular, teardrop-shaped, or semi-elliptical cross-section, optimizes the contact pressure gradient. Compared to traditional single-point, simple, protruding designs, the sealing lip 8 exhibits a distribution with varying lengths and curvatures. Its linear pressure distribution is guided by geometric curvature, gradually shifting the contact pressure from the lip tip (high-pressure zone) to the lip root (low-pressure zone), thus avoiding localized wear caused by stress concentration. Furthermore, under conditions of vibration or thermal expansion, the geometric symmetry of the sealing lip 8 allows for uniform deformation of the lip, maintaining sealing pressure fluctuations within a stable range and exhibiting good dynamic adaptability. Furthermore, the lip geometry provides space for elastic deformation, compensating for wire harness 01 diameter tolerances and reducing leakage rates. This achieves adaptive interference fit and provides excellent tolerance compensation capabilities.

[0051] In some embodiments, at least two sealing lips 8 are provided in the wire hole 2 , and the sealing lips 8 are arranged inside the wire hole 2 at intervals.

[0052] It is worth noting that the multiple sealing lips 8 arranged at intervals can not only further enhance the sealing effect, but also the contact point of each sealing lip 8 can form multiple fulcrums. The structure similar to the multi-point support can reduce the local bending stress of the wire harness 01, thereby helping to maintain the straightness of the wire harness 01, and thus providing a straightening effect when the wire harness 01 is bent to ensure the stability of the seal.

[0053] In some embodiments, when the sealing plug is installed in the corresponding sealing occasion, air or lubricating oil is provided at both ends of the sealing plug structure as a sealing medium, and the sealing plug structure can isolate the corresponding sealing medium. Among them, the lubricating oil can be selected from FUCHS 4101 oil and Castrol 805C-EV lubricating oil. Different materials can be selected according to different oil resistance requirements, and no excessive restrictions are made here.

[0054] In summary, the sealing plug structure in the present application is axially arranged inside the rubber matrix 1 through the support skeleton 3, which solves the problem of sealing failure caused by the single rubber matrix 1 being easily deformed under pressure in traditional technology, and improves the overall rigidity of the sealing plug structure and the ability to resist deformation caused by external loads; at the same time, the support skeleton 3 is arranged to surround the internal wire hole 2, providing a large radial force support for the inside of the sealing plug, and realizes the anti-escape function without relying on additional assembly limiting parts, thereby increasing the sealing stability inside the wire hole 2; therefore, the present invention solves the problem that the sealing plug structure is difficult to balance elastic sealing and strength by setting a composite structure of the support skeleton 3 and the rubber matrix 1, realizes the functional coordination of the elastic sealing and rigid support of the sealing plug structure, and ensures the reliability of the seal; in the present application, the rubber matrix 1 can be provided with a sealing part 4 and a clamping part 5 in the axial direction, and the sealing part 4 significantly increases the sealing plug structure and the external The interference fit force of the shell solves the risk of seal disengagement, and the clamping and positioning surface of the clamping part 5 provided therein can be used as the clamping and positioning surface of the tooling. The present invention solves the potential sealing failure problem caused by the sealing surface of the sealing plug mechanism in the traditional technology being used as the clamping and positioning surface at the same time through the partitioning setting of the functional surface area of ​​the sealing plug structure; in this application, a raised sealing lip 8 is provided in the wire hole 2 inside the rubber matrix 1, and the aperture of the wire hole 2 becomes smaller at the position passing through the sealing lip 8. During the assembly process, the wiring harness 01 passes through the lip of the sealing lip 8 and the interference fit with the sealing lip 8 can achieve the corresponding internal sealing effect. At the same time, a plurality of sealing lips 8 arranged at intervals can be provided, which can not only further enhance the sealing effect, but also each contact point of the sealing lip 8 can form multiple fulcrums, similar to a structure with multi-point support, which can reduce the local bending stress of the wiring harness 01, thereby helping to maintain the straightness of the wiring harness 01, thereby providing a straightening effect when the wiring harness 01 is bent to ensure the stability of the seal.

[0055] The present application further discloses an electric bridge, which includes the above-mentioned sealing plug structure and has all its beneficial effects. It should be noted that the sealing plug structure can also be used as a sealing structure for other functional modules.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

[0057] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present application. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details or by other devices, systems, assemblies, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present application.

[0058] Reference throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described herein and shown are possible in light of the teachings herein and are considered part of the spirit and scope of the invention.

[0059] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0060] In addition, unless otherwise expressly indicated, any marking arrows in the drawings should be regarded as illustrative only and not limiting. Furthermore, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or." Where a term is unclear in providing separation or combination capabilities, the combination of components or steps will also be considered as indicated.

[0061] As used in the description herein and throughout the claims that follow, “a,” “an,” and “the” include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless otherwise indicated.

[0062] The above description of the illustrated embodiments of the present invention (including the content in the description abstract) is not intended to be exhaustive or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, as those skilled in the art will recognize and understand, various equivalent modifications are possible within the spirit and scope of the present invention. As noted, these modifications can be made to the present invention in accordance with the above description of the embodiments of the present application, and these modifications will be within the spirit and scope of the present invention.

[0063] This paper generally describes systems and methods as details that are helpful for understanding the present invention. In addition, various specific details have been given to provide an overall understanding of the embodiments of the present application. However, those skilled in the relevant art will recognize that the embodiments of the present invention can be put into practice without one or more specific details, or can be put into practice using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, known structures, materials and / or operations are not particularly shown or described in detail to avoid confusion in various aspects of the embodiments of the present application.

Claims

1. A sealing plug structure, characterized in that: include: A rubber base body, wherein a wire hole is provided through the rubber base body; A support frame is arranged inside the rubber matrix along the axial direction of the wire hole, and the support frame surrounds the wire hole to provide support force for the wire hole in the radial direction.

2. A sealing plug structure according to claim 1, characterized in that: The support frame is a rotating body structure, and the interior of the support frame is hollow.

3. The sealing plug structure according to claim 1, characterized in that: The rubber matrix is ​​a body of revolution structure, and includes a sealing portion and a clamping portion along the axial direction. The sealing portion and the clamping portion have different diameters, and the support frame is arranged inside the sealing portion. The outer peripheral surface of the sealing portion is a sealing surface, and the outer peripheral surface of the clamping portion is a clamping positioning surface.

4. A sealing plug structure according to claim 3, characterized in that: The rotation diameter of the clamping portion is smaller than the rotation diameter of the sealing portion.

5. The sealing plug structure according to claim 3, characterized in that: A ring-shaped reinforcing plate is provided on one side of the support frame close to the clamping portion. The reinforcing plate itself is surrounded to form a connecting hole. The clamping portion passes through the connecting hole and is connected to the sealing portion.

6. The sealing plug structure according to claim 1, characterized in that: The rubber matrix completely wraps the supporting skeleton.

7. A sealing plug structure according to any one of claims 1 to 6, characterized in that: A sealing lip is provided in the wire hole, and the sealing lip is annularly protruding on the hole wall of the wire hole. The aperture of the lip of the sealing lip is smaller than the aperture of the wire hole. The wiring harness passes through the lip of the sealing lip and is interference fit with the sealing lip to achieve sealing.

8. The sealing plug structure according to claim 7, characterized in that: The cross-sectional shape of the sealing lip is trapezoidal, semicircular, teardrop-shaped or semi-elliptical.

9. The sealing plug structure according to claim 7, characterized in that: At least two sealing lips are provided in the wire hole, and the sealing lips are arranged inside the wire hole at intervals.

10. A bridge, characterized in that: The sealing plug structure comprises any one of claims 1-9.

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