A lead seal structure

Abstract

This utility model relates to the field of product assembly technology, specifically to a structural design for optimizing the assembly efficiency of a lead seal structure. This utility model is achieved through the following technical solution: A lead seal structure includes a lead seal body and a lead seal screw. The lead seal screw is screwed into the lead seal body and includes a stud and a nut. A first through-hole is transversely formed on the nut. The lead seal body has a second through-hole that mates with the first through-hole. The nut includes a pressure contact surface of the lead seal body, and a positioning groove is formed on the pressure contact surface. The lead seal body includes a nut abutment surface, and the nut abutment surface contains an elastic protrusion that mates with the positioning groove. When the elastic protrusion engages with the positioning groove, the second through-hole and the first through-hole are aligned. The purpose of this utility model is to achieve rapid and accurate positioning and engagement between the through-hole of the lead seal screw and the through-hole of the lead-sealed body, thereby improving assembly efficiency and product assembly consistency.

Description

Technical Field

[0001] This utility model relates to the field of product assembly technology, specifically to a structural design for optimizing the assembly efficiency of a lead seal structure. Background Technology

[0002] In the production of numerous industrial products and civilian equipment, lead-sealing screws serve as crucial connecting and protective components, widely used in the fixing and sealing of various structural parts. The screw head features a through-hole for threading a sealing wire. During the assembly of products requiring lead sealing, such as meters and electrical junction boxes, the through-hole of the lead-sealing screw is aligned with the corresponding hole on the component to be sealed, and then a stainless steel lead-sealing wire is threaded through, thereby providing additional safety protection and enhancing the safety of equipment use.

[0003] For example, Chinese patent document CN221547512U discloses a lead-sealing screw for an electricity meter, which includes a stud and a nut disposed on the upper end of the stud. The nut has a through hole that extends horizontally through the nut. An annular compression washer is fitted onto the upper part of the stud. During installation, the compression washer provides a certain buffer to ensure a tight connection of the lead-sealing screw. At the same time, when the lead-sealing screw is fully screwed in and the through hole on the nut is misaligned with the connection hole of the electricity meter, the screw can be loosened to realign it.

[0004] In existing lead seal structures, the assembly process typically requires repeated manual observation and adjustment to align the lead seal screw holes with the corresponding holes on the sealed components. This method is time-consuming, significantly extending the equipment assembly cycle and reducing overall production efficiency. Furthermore, the accuracy of manual alignment is difficult to guarantee. Due to differences in the skill level and operating habits of different operators, hole position deviations are prone to occur, affecting the firmness and reliability of the lead seal connection. This, in turn, leads to inconsistent product assembly quality and impacts the overall performance of the product. Utility Model Content

[0005] In view of the above-mentioned problems in the prior art, this utility model proposes a lead seal structure, which, compared with the existing device, can realize the rapid and accurate positioning and matching of the wire hole of the lead seal screw and the wire hole of the sealed body, effectively improving assembly efficiency and the consistency and reliability of product assembly.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A lead seal structure includes a lead seal body and a lead seal screw. The lead seal screw is screwed into the lead seal body and includes a stud and a nut. A first through hole is transversely formed on the nut. The lead seal body has a second through hole that mates with the first through hole. The nut includes a pressure contact surface of the lead seal body, and a positioning groove is formed on the pressure contact surface of the lead seal body. The lead seal body includes a nut abutment surface, and the nut abutment surface includes an elastic protrusion that mates with the positioning groove. The elastic protrusion and the positioning groove are configured such that when the elastic protrusion engages with the positioning groove, the second through hole and the first through hole are aligned.

[0008] The lead-sealing screw is screwed into the lead-sealing body via a threaded connection. The nut has a first through-hole, and the lead-sealing body also has a corresponding second through-hole. To ensure precise alignment of the two through-holes during assembly, a positioning groove is provided on the lead-sealing body's contact surface of the nut, while the nut's contact surface of the lead-sealing body includes an elastic protrusion that mates with the positioning groove. To ensure alignment accuracy, the angle formed by the horizontal center axis of the positioning groove and the horizontal center axis of the first through-hole on the horizontal projection plane should be consistent with the angle formed by the horizontal center axis of the elastic protrusion and the horizontal center axis of the second through-hole on the horizontal projection plane. For example, if the positioning groove is positioned directly below the first through-hole (i.e., the angle between their center axes on the horizontal projection plane is 0°), then the elastic protrusion should also be positioned directly below the second through-hole (again, the angle between their center axes on the horizontal projection plane is 0°).

[0009] During assembly, a certain torque is applied to screw the lead-sealed screw into the lead-sealed body. As the screw is screwed in, the pressure surface of the lead-sealed body gradually approaches the nut-abutment surface. When the screw is screwed in to a specific depth, the locating groove contacts and engages with the elastic protrusion. Specifically, when the screw is screwed in close to the final assembly position, the pressure surface of the nut contacts the elastic protrusion first. At this point, continuing to tighten the screw will generate some frictional resistance. Because the elastic protrusion has a certain elastic deformation capacity, this resistance will not immediately prevent the screw from being screwed in further, but will deform moderately under pressure, allowing the screw to continue to be screwed in. When the screw is further screwed in until the locating groove reaches the position of the elastic protrusion, the elastic protrusion partially recovers its deformation under its own elastic force and embeds itself into the locating groove, achieving engagement and fixation. At this point, because the resistance between the two is greater than the applied tightening torque, the screw cannot be screwed in further, indicating that the assembly is complete. Furthermore, since the relative angle between the positioning groove and the elastic protrusion is consistent with the relative angle between the first threading hole and the second threading hole, the first threading hole and the second threading hole are precisely aligned at the same time as they engage.

[0010] This invention creates a positioning groove on the pressure surface of the lead seal body of the lead seal screw and sets a matching elastic protrusion on the nut abutment surface of the lead seal body. By utilizing the interlocking relationship between the positioning groove and the elastic protrusion, as well as the preset corresponding angle relationship between them relative to the first and second through holes, accurate alignment of the through holes can be achieved without repeated manual adjustment of the angle or position of the lead seal screw during the screw-in process. This not only improves assembly efficiency but also effectively avoids problems such as inconsistent product assembly quality caused by misalignment, significantly improving the assembly accuracy and reliability of the product.

[0011] Preferably, the nut includes a lead-sealed nut connected to the stud and a drive nut installed on the top of the lead-sealed nut, the connection between the lead-sealed nut and the drive nut being provided with an easy-release structure, and the top of the drive nut containing a drive groove.

[0012] The top surface of the drive nut has a drive groove for use with screwdrivers and other tightening tools. By inserting the screwdriver head into the drive groove, the lead seal screw can be installed and tightened. In traditional lead seal structures, the lead seal wire passes through the first and second through holes, exits through the lead seal block, and is knotted for fixation. The lead seal block is then flattened using lead seal pliers to complete the seal. However, because the lead seal block is exposed and made of relatively soft material, it is easily deformed. Unauthorized personnel can easily pry open the lead seal block with sharp tools, untie the knotted lead seal wire, and then reverse-tighten the lead seal screw, thus removing the lead seal without leaving any obvious traces, rendering its anti-theft and anti-tampering functions ineffective. To address this, an easy-detachment structure is incorporated at the connection between the lead-sealed nut and the drive nut. Once the lead-sealed screw is fully tightened, i.e., the positioning groove and the elastic protrusion engage, a certain force can be applied to break or snap off the drive nut, causing the drive groove to detach from the main structure. This ensures that the lead-sealed screw can only be tightened once, preventing subsequent disassembly or adjustment using conventional tools. This effectively prevents unauthorized personnel from altering the equipment or device, significantly improving the security and resistance to damage of the lead-sealing system, and providing excellent anti-theft and anti-tampering effects. Specifically, this easy-detachment structure can be implemented as a localized welded point at the connection between the lead-sealed nut and the drive nut, or a circumferential welded seam can be provided on the outer ring of the connection. This allows the drive nut to reliably break off from the lead-sealed nut when a certain torque is reached, without affecting the structural integrity of the lead-sealed screw itself.

[0013] Preferably, the cross-sectional width of the drive nut gradually decreases from top to bottom.

[0014] The wider top of the drive nut effectively increases the contact area between the tightening tool and the drive groove, facilitating tool alignment and insertion, and improving operational convenience and installation efficiency. Simultaneously, an easy-release structure is provided between the drive nut and the lead-sealed nut. Because its cross-sectional width gradually decreases from top to bottom, stress is more easily concentrated in the bottom area under external force, thus improving the consistency and controllability of fracture at the easy-release structure. This ensures reliable and accurate positioning during the tightening process of the drive nut, avoiding incomplete or unexpected fracture.

[0015] Preferably, the maximum width of the cross-section of the drive nut is smaller than the cross-sectional width of the lead-sealed nut.

[0016] The maximum width of the cross-section of the drive nut is smaller than that of the lead seal nut, which makes it easier to remove the drive nut from the lead seal after it is broken off. This effectively avoids the problem of the drive nut getting stuck inside the lead seal and being difficult to separate, thereby improving the convenience of operation and assembly efficiency.

[0017] Preferably, the pressure contact surface of the lead seal body is configured as an outwardly convex arc-shaped pressure contact surface.

[0018] When the lead-sealed screw is screwed to near its final assembly position, the pressure surface of the lead seal body first contacts the elastic protrusion. Because this pressure surface has a convex arc-shaped structure, it forms a point or line contact with the elastic protrusion. Compared to the traditional planar pressure contact method, the arc-shaped structure only interacts with the elastic protrusion through a localized area during the initial contact phase, effectively reducing frictional resistance during screwing and making the screw easier to screw in smoothly. Furthermore, traditional planar pressure contacts form a large contact area at the moment of contact, which can easily lead to stress concentration, especially at the edges of the elastic protrusion, causing excessive localized stress and resulting in deformation or damage. In contrast, the arc-shaped pressure contact structure achieves a more uniform stress distribution, reducing the risk of damage to the elastic protrusion and improving assembly reliability and structural durability.

[0019] Preferably, the two sidewalls of the positioning groove are inclined outward from top to bottom.

[0020] The positioning groove has sidewalls that slope outwards from top to bottom. Compared to sidewalls that are vertical, this sloped structure provides better guidance during assembly, allowing the elastic protrusion to slide more smoothly into the groove and achieve stable engagement. At the same time, the sloped sidewalls increase the contact area with the elastic protrusion, effectively improving the connection strength between them, enabling them to withstand greater shear forces, and significantly enhancing the robustness of the engagement structure.

[0021] Preferably, the elastic protrusion includes a top wall and two side walls extending downward from the top wall, and an inclined transition portion is provided between the top wall and the side walls.

[0022] Compared to sharp-cornered structures, inclined transition sections (such as rounded or chamfered designs) effectively avoid stress concentration, significantly improving structural strength and fatigue life during assembly and use, and reducing the risk of cracking or breakage due to excessive local stress. Simultaneously, during assembly, this inclined transition section provides good guidance, reducing scraping and jamming between the elastic protrusion and the lead seal body's contact surface, resulting in smoother engagement between the lead seal screw 2 and the lead seal 1, thus improving assembly efficiency and connection reliability.

[0023] Preferably, the pressure contact surface of the lead seal body has two positioning grooves along the same horizontal central axis, and two corresponding elastic protrusions are provided. The elastic protrusions and the positioning grooves are configured such that any one of the elastic protrusions can engage with any one of the positioning grooves.

[0024] When the lead seal screw is tightened to near its final assembly position, the pressure surface of the lead seal body first contacts the elastic protrusion, generating relative sliding friction during continued tightening. Because two symmetrical positioning grooves are arranged along the same horizontal central axis on the pressure surface of the lead seal body, and two corresponding elastic protrusions are configured, and both the first and second through holes are transversely penetrating structures, accurate alignment of the through hole can be achieved by any elastic protrusion engaging with any positioning groove during tightening. Compared to a method using only one positioning groove and one elastic protrusion, this structure significantly shortens the frictional sliding stroke between the pressure surface of the lead seal body and the elastic protrusion, effectively reducing assembly resistance and improving assembly efficiency. Simultaneously, the synergistic effect of the two engagement structures further enhances the stability of the connection between the lead seal screw and the lead seal body, improves the anti-loosening performance and connection reliability after tightening, thereby better ensuring the irreversibility of the lead seal state and its anti-theft and anti-tampering capabilities.

[0025] In summary, this utility model has the following beneficial effects:

[0026] 1. By using the engagement relationship between the positioning groove and the elastic protrusion, and by setting the relative positions of the two with the first and second through holes, the assembly efficiency and accuracy of the lead seal screw are greatly improved.

[0027] 2. The nuts include a lead-sealing nut and a drive nut. The drive groove is opened on the top surface of the drive nut. The connection between the lead-sealing nut and the drive nut is provided with an easy-release structure, which can ensure that the lead-sealing screw can only be tightened once, significantly improving the security and anti-damage capability of the lead-sealing system, and providing good anti-theft and anti-tampering effects.

[0028] 3. The pressure contact surface of the lead seal body is set as an outwardly convex arc-shaped pressure contact surface, which effectively reduces the frictional resistance during the assembly process of the lead seal screw and the risk of damage to the elastic protrusion.

[0029] 4. Setting two positioning grooves and their corresponding elastic protrusions can not only effectively reduce assembly resistance and improve assembly efficiency, but also enhance the stability of the connection between the lead seal screw and the lead seal body. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall lead seal structure of Example 1;

[0031] Figure 2 yes Figure 1 Partial top view of the lead seal;

[0032] Figure 3 This is a schematic diagram of the contact surface of the lead seal nut in Example 1;

[0033] Figure 4 This is a schematic diagram of the lead-sealed screw in Example 1;

[0034] Figure 5 yes Figure 4 Schematic diagram of the bottom structure of the lead seal screw;

[0035] Figure 6 yes Figure 4 Schematic diagram of the central bearing drive nut structure.

[0036] in:

[0037] 1-Lead seal body; 11-Second threading hole; 12-Nut contact surface; 121-Elastic protrusion; 1211-Top wall; 1212-Side wall; 1213-Inclined transition part; 2-Lead seal screw; 21-Stud; 22-Nut; 221-First threading hole; 222-Lead seal body pressure surface; 2221-Positioning groove; 223-Lead seal nut; 224-Drive nut; 2241-Drive groove; 225-Easy-to-remove structure. Detailed Implementation

[0038] To make the technical means, inventive features, objectives, and effects of this utility model readily understandable, the present utility model is further described below in conjunction with specific illustrations. However, this utility model is not limited to the following embodiments.

[0039] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Example

[0040] like Figure 1The illustrated lead seal structure includes a lead seal body 1 and a lead seal screw 2, the lead seal screw 2 being threaded into the interior of the lead seal body 1. The lead seal body 1 has a second through hole 11 extending laterally, such as... Figure 4 The lead-sealing screw 2 shown consists of a stud 21 and a nut 22 located above the stud 21. A first through hole 221 matching the second through hole 11 is opened transversely on the nut 22.

[0041] To achieve precise and rapid alignment of the two wire holes during assembly, a positioning groove 2221 is provided on the lead seal body pressure contact surface 222 of the nut 22. Correspondingly, such as Figure 2 and Figure 3 As shown, an elastic protrusion 121 is disposed at a corresponding position on the nut abutment surface 12 of the lead seal body 1. The positioning groove 2221 and the elastic protrusion 121 are configured such that when the elastic protrusion 121 is engaged in the positioning groove 2221, the second threading hole 11 is aligned with the first threading hole 221. Specifically, the angle formed by the horizontal central axis of the positioning groove 2221 and the horizontal central axis of the first threading hole 221 on the horizontal projection plane is consistent. For example, if the positioning groove 2221 is located directly below the first threading hole 221, that is, the angle between their central axes on the horizontal projection plane is 0°, then the elastic protrusion 121 should also be located directly below the second threading hole 11, and similarly, the angle between their central axes on the horizontal projection plane is 0°.

[0042] During assembly, a certain torque is applied to screw the lead-sealing screw 2 into the lead-sealing body 1. As the lead-sealing screw 2 is continuously screwed in, the pressure contact surface 222 of the lead-sealing body gradually approaches the nut contact surface 12 of the lead-sealing body 1. When the lead-sealing screw 2 is screwed in to a specific depth, the positioning groove 2221 contacts and engages with the elastic protrusion 121. During this process, when the lead-sealing screw 2 is screwed in close to the final assembly position, the pressure contact surface 222 of the nut 22 first contacts the elastic protrusion 121. At this time, continuing to screw the lead-sealing screw 2 will generate a certain frictional resistance. Since the elastic protrusion 121 has a certain elastic deformation capability, this resistance will not immediately prevent the lead-sealing screw 2 from continuing to screw in, but will undergo moderate deformation under pressure, allowing the lead-sealing screw 2 to continue to screw downwards. When the lead-sealing screw 2 is further screwed in until the positioning groove 2221 reaches the position of the elastic protrusion 121, the elastic protrusion 121 partially recovers its deformation under its own elastic force and is embedded in the positioning groove 2221, realizing the locking and fixing of the two. At this point, because the resistance between the two exceeds the applied tightening torque, the lead-sealed screw 2 can no longer rotate, marking the completion of the assembly. Simultaneously, since the relative angle between the positioning groove 2221 and the elastic protrusion 121 is consistent with the relative angle between the first threading hole 221 and the second threading hole 11, precise alignment of the two threading holes is achieved simultaneously with the fitting.

[0043] Preferably, such as Figure 3 As shown, in this embodiment, the elastic protrusion 121 includes a top wall 1211 and two side walls 1212 extending downward from the top wall 1211. An inclined transition portion 1213 is also provided between the top wall 1211 and the two side walls 1212. Compared with the sharp-cornered structure where the top wall 1211 and the side walls 1212 are directly connected, the inclined transition portion 1213 (e.g., a rounded or chamfered design) can effectively avoid stress concentration, significantly improve its structural strength and fatigue life during assembly and use, and reduce the risk of cracking or breakage due to excessive local stress. At the same time, during assembly, the inclined transition portion 1213 can play a good guiding role, reducing the scraping and jamming between the elastic protrusion 121 and the lead seal body pressure contact surface 222, making the fit between the lead seal screw 2 and the lead seal 1 smoother, improving assembly efficiency and connection reliability.

[0044] Furthermore, such as Figures 4 to 6 As shown, the nut 22 consists of a lead-sealing nut 223 and a drive nut 224 mounted on its top. The drive nut 224 has a drive groove 2241 at its top for use with screwdrivers or other tightening tools. By inserting a screwdriver into the drive groove 2241, the lead-sealing screw 2 can be installed and tightened. In a traditional lead-sealing structure, the lead-sealing wire passes through the first thread hole 221 and the second thread hole 11 in sequence, exits the lead-sealing body, and is knotted for fixation. The lead-sealing block is then flattened using lead-sealing pliers to complete the sealing. However, because the lead-sealing block is exposed and made of relatively soft material, it is easily deformed. Unauthorized personnel can use sharp tools to pry open the lead-sealing block, untie the lead-sealing wire knot, and then reverse-tighten the lead-sealing screw, thereby removing the lead-sealing without leaving obvious traces, rendering its anti-theft and anti-tampering functions ineffective.

[0045] To address the aforementioned issues, an easy-release structure 225 is provided at the connection between the lead-sealing nut 223 and the drive nut 224. When the lead-sealing screw 2 is tightened to its proper position, i.e., the positioning groove 2221 and the elastic protrusion 121 are fully engaged, the drive nut 224 can be broken off or snapped off by applying a certain external force, causing the drive groove 2241 to detach from the main structure. This ensures that the lead-sealing screw 2 can only be tightened once, and cannot be disassembled or adjusted using conventional tools afterward, effectively preventing unauthorized personnel from altering the equipment or device, significantly improving the security and anti-vandalism capabilities of the lead-sealing system, and providing excellent anti-theft and anti-tampering effects. Specifically, the easy-release structure 225 can be provided at the connection between the lead-sealing nut 223 and the drive nut 224 in the form of a local weld point, or a circumferential weld seam can be provided on the outer ring of the connection, so that when a certain torque is reached, the drive nut can reliably break off from the lead-sealing nut without affecting the structural integrity of the lead-sealing screw 2 itself.

[0046] In this embodiment, the design of the drive nut 224 adopts a cross-sectional width that gradually decreases from top to bottom, with a larger width at the top. This design effectively increases the contact area between the tightening tool and the drive groove 2241, facilitating tool alignment and insertion, thereby improving operational convenience and installation efficiency. Furthermore, an easy-release structure 225 is provided between the drive nut 224 and the lead-sealed nut 223. Because the cross-sectional width of the drive nut 224 gradually decreases from top to bottom, stress is concentrated in the bottom area when subjected to external force. This improves the consistency and controllability of fracture at the easy-release structure 225, ensuring reliable operation and accurate positioning of the drive nut 224 during the tightening process, avoiding incomplete or unexpected fracture.

[0047] Preferably, the maximum width of the cross-section of the drive nut 224 is designed to be smaller than the width of the lead seal nut 223. This design makes it easier to remove the drive nut 224 from the lead seal body 1 after it is broken off, effectively avoiding the problem of the drive nut 224 getting stuck inside the lead seal body and being difficult to separate, further improving the convenience of operation and assembly efficiency.

[0048] Furthermore, the lead seal body pressure contact surface 222 adopts an outwardly convex arc-shaped structure design. When the lead seal screw 2 is screwed to near the final assembly position, the lead seal body pressure contact surface 222 first contacts the elastic protrusion 121. Since the pressure contact surface is outwardly convex arc-shaped, it forms a point contact or line contact with the elastic protrusion 121. Compared with the traditional planar pressure contact method, this arc-shaped structure only acts on the elastic protrusion 121 through a local area in the initial contact stage, which significantly reduces the frictional resistance during the screwing process, allowing the lead seal screw to be screwed in more smoothly. In addition, the traditional planar pressure contact forms a large contact interface at the moment of contact, which is prone to stress concentration, especially in the edge area of ​​the elastic protrusion 121, which is more obvious and can easily lead to excessive local stress, thereby causing deformation or damage. The arc-shaped pressure contact structure can achieve a more uniform stress distribution, effectively reducing the risk of damage to the elastic protrusion 121, thereby improving assembly reliability and structural durability.

[0049] On the other hand, the two sidewalls of the positioning groove 2221 are inclined outward from top to bottom and are adapted to the shape of the elastic protrusion 121. These inclined sidewalls have better guiding performance than vertical sidewalls, helping to guide the elastic protrusion 121 smoothly into the groove and achieve stable engagement during assembly. At the same time, the inclined sidewalls also increase the contact area with the elastic protrusion 121, further enhancing the strength of the connection and enabling it to withstand greater shear loads, significantly strengthening the connection strength and stability of the engagement structure.

[0050] Furthermore, such as Figure 3 and Figure 5As shown, two positioning grooves 2221 are symmetrically formed on the pressure contact surface 222 of the lead seal body along the same horizontal central axis. Correspondingly, two elastic protrusions 121 are provided on the nut abutment surface 12 of the lead seal body 1. When the lead seal screw 2 is screwed to near the final assembly position, the pressure contact surface 222 of the lead seal body first contacts the elastic protrusions 121, and relative sliding friction is generated during the continued screwing process.

[0051] Since the two positioning grooves 2221 are symmetrically arranged along the horizontal central axis and correspondingly equipped with two elastic protrusions 121, and both the first wire hole 221 and the second wire hole 11 are transversely penetrating structures, during assembly, as long as any elastic protrusion 121 engages with any positioning groove 2221, accurate alignment of the two wire holes can be achieved. Compared with a structure that only has a single positioning groove and a single elastic protrusion, this design significantly shortens the frictional sliding stroke between the lead seal body pressure contact surface 222 and the elastic protrusion 121, effectively reducing frictional resistance during assembly and improving assembly efficiency.

[0052] Furthermore, the combination of the double positioning groove and the double elastic protrusion not only achieves the alignment function but also enhances the connection stability between the lead seal screw 2 and the lead seal body 1. The two sets of interlocking structures work together to not only improve the anti-loosening performance after tightening but also further enhance the overall connection reliability, thereby better ensuring the irreversibility of the lead seal state and enhancing anti-theft and anti-tampering capabilities.

Claims

1. A lead seal structure comprising a lead seal body (1) and a lead seal screw (2), wherein the lead seal screw (2) is screwed into the lead seal body (1) and comprises a stud (21) and a nut (22), wherein a first through hole (221) is transversely provided on the nut (22), and the lead seal body (1) is provided with a second through hole (11) that mates with the first through hole (221), characterized in that: The nut (22) includes a lead seal body pressure contact surface (222), and a positioning groove (2221) is provided on the lead seal body pressure contact surface (222). The lead seal body (1) includes a nut abutment surface (12), and the nut abutment surface (12) includes an elastic protrusion (121) that cooperates with the positioning groove (2221). The elastic protrusion (121) and the positioning groove (2221) are configured such that when the elastic protrusion (121) is engaged in the positioning groove (2221), the second wire hole (11) and the first wire hole (221) are aligned.

2. The lead seal structure of claim 1 wherein: The nut (22) includes a lead-sealed nut (223) connected to the stud (21) and a drive nut (224) installed on the top of the lead-sealed nut (223). The connection between the lead-sealed nut (223) and the drive nut (224) is provided with an easy-release structure (225). The top of the drive nut (224) contains a drive groove (2241).

3. The lead seal structure of claim 2 wherein: The cross-sectional width of the bearing nut (224) gradually decreases from top to bottom.

4. The lead seal structure of claim 2 wherein: The maximum width of the cross-section of the bearing nut (224) is smaller than the width of the cross-section of the lead seal nut (223).

5. The lead seal structure of claim 1 wherein: The pressure contact surface (222) of the lead seal body is configured as an outwardly convex arc-shaped pressure contact surface.

6. The lead seal structure of claim 1 wherein: The two side walls of the positioning groove (2221) are gradually inclined outward from top to bottom.

7. The lead seal structure of claim 1 wherein: The elastic protrusion (121) includes a top wall (1211) and two side walls (1212) extending downward from the top wall (1211), and an inclined transition portion (1213) is provided between the top wall (1211) and the side walls (1212).

8. The lead seal structure of claim 1 wherein: The pressure contact surface (222) of the lead seal body has two positioning grooves (2221) along the same horizontal central axis. The elastic protrusion (121) is set to two respectively. The elastic protrusion (121) and the positioning groove (2221) are configured such that any elastic protrusion (121) can engage with any positioning groove (2221).

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