A board card type lead sealing mechanism

Abstract

A board card type lead sealing mechanism comprises a first shell (provided with a first matching part), a second shell (provided with a second matching part) and a limiting part. After the first shell and the second shell are installed, the first matching part and the second matching part jointly enclose an installation space. After the limiting part is inserted into the installation space, the limiting part (or jointly with the first matching part) forms a limiting matching along a first direction (a shell separation direction), thereby preventing the shell from being pulled open; meanwhile, the limiting part forms a limiting matching along a second direction (a limiting part ejection direction) with the first matching part and / or the second matching part, thereby preventing the limiting part from being pulled out in the reverse direction. The two-way limiting parts restrict each other, so that after installation, the device cannot be disassembled without damage unless the components are damaged, and the anti-tampering ability is strong.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, specifically to a board-type lead seal mechanism. Background Technology

[0002] Electricity meters are core instruments in power systems used to measure electricity consumption, and their accuracy directly affects fair transactions between power supply companies and users. To prevent unauthorized personnel from opening the meter casing, adjusting its internal structure, or tampering with metering data, a lead seal (also known as a metering seal) is typically installed on the electricity meter. As a physical or electronic security measure, the lead seal effectively records whether unauthorized opening has occurred and is a crucial means of ensuring the reliability of electricity meter readings.

[0003] Traditional lead seals typically use metal lead thread or plastic snap-fits, achieving a one-time locking effect through threading and crimping. However, these traditional lead seals have the following drawbacks: First, the installation process is cumbersome, requiring specialized tools and resulting in low efficiency; second, the exposed seal structure is easily counterfeited or restored after damage, offering limited tamper resistance; third, some seals separate from the casing, making them prone to loss during transportation or use; and fourth, for board-type structures (such as the plug-in assembly of a circuit board housing and a bottom shell), existing lead seals cannot provide reliable bidirectional locking, leaving gaps between the casings that can still be pried open. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a board-type lead seal mechanism.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A board-type lead seal mechanism, comprising: The first housing has a first mating part; The second housing is provided with a second mating part. The second housing and the first housing are installed together and when they are in the installation state, the first mating part and the second mating part together form an installation space. The limiting member is inserted into the installation space. The limiting member forms a limiting fit with the first mating part along the first direction or forms a limiting fit with both of them along the first direction, where the first direction is the direction in which the first housing and the second housing are separated from each other. Furthermore, the limiting member forms a limiting fit with the first mating part and / or the second mating part along a second direction, which is the direction in which the limiting member disengages from the installation space.

[0006] The second housing has a corresponding through hole through which the first housing can pass.

[0007] The first mating part is a first L-shaped block integrally formed on the upper surface of the first housing, and the second mating part is a second L-shaped block integrally formed on the upper surface of the second housing. When the two are in the installation state, the upper ends of the first L-shaped block and the second L-shaped block are connected to each other to form the installation space.

[0008] The first housing is provided with a fastening element. When the first housing and the second housing are in the installation state, the fastening element and the second housing form a limiting engagement along the first direction.

[0009] The limiting component includes: Limiting the main body; Symmetrically arranged buckles are integrally formed at the rear end of the limiting body and engage with the first buckle provided on the side wall of the first or second housing to form a limiting fit along the second direction.

[0010] The bottom of the limiting body extends backward to form a limiting part, and a limiting space for the limiting fastener is formed between the limiting part and the second fastener on the second housing.

[0011] The end of the limiting member is provided with a sealing plate, which is adapted to the shape of the inlet of the installation space.

[0012] The length of the limiting component is consistent with the depth of the installation space. The first housing and the second housing together form a receiving groove for accommodating the screw.

[0013] The limiting component includes: Limiting the main body; Symmetrically arranged buckles are integrally formed at the rear end of the limiting body and form a limiting fit with the first buckle provided on the side wall of the first housing or the second housing in the second direction; The sealing plate is integrally formed above the buckle plate and covers the entrance of the entire installation space.

[0014] The beneficial effects of this invention are as follows: The first and second mating parts form an installation space. After the limiting member is inserted, it forms a limiting fit with the first mating part (or both together) along a first direction (the direction of separation of the housing), effectively preventing the first and second housings from being pulled apart. Furthermore, the limiting member forms a limiting fit with the first and / or second mating parts along a second direction (the direction of the limiting member's removal), preventing the limiting member from being pulled out in the opposite direction. This bidirectional limiting mechanism mutually restricts each other; once installation is complete, it cannot be disassembled without damage unless the limiting member or the housing is destroyed, significantly improving the anti-tampering capability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention (Example 1).

[0016] Figure 2 This is a schematic diagram of the limiting member of the present invention (Example 1).

[0017] Figure 3 This is a cross-sectional schematic diagram of the present invention (Example 1).

[0018] Figure 4 This is an enlarged schematic diagram of the installation space of the present invention (Example 1).

[0019] Figure 5 This is a cross-sectional view of the installation space of the present invention (Example 1). Figure 1 .

[0020] Figure 6 This is a cross-sectional view of the installation space of the present invention (Example 1). Figure 2 .

[0021] Figure 7 This is an enlarged schematic diagram of the through hole in the present invention (Example 1).

[0022] Figure 8 This is a schematic diagram of the structure of the present invention (Example 2).

[0023] Figure 9 This is a schematic diagram of the limiting member of the present invention (Example 2).

[0024] Figure 10 This is a cross-sectional schematic diagram of the present invention (Example 2).

[0025] Figure 11 This is an enlarged schematic diagram of the installation space of the present invention (Embodiment 2).

[0026] Figure 12 This is a cross-sectional view of the installation space of the present invention (Embodiment 2). Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain a specific posture (as shown in the figure).

[0029] This invention provides a plate-type lead seal mechanism, which is particularly suitable for metering equipment such as electricity meters, to prevent unauthorized opening of the equipment casing. The lead seal mechanism mainly includes: a first housing 100, a second housing 200, and an independent limiting member 300.

[0030] The lead seal mechanism proposed in this application is not a lead seal in the traditional sense, but rather a lead seal is formed by the direct cooperation of the first housing and the second housing, with a limiting member cooperating with both.

[0031] Taking an electricity meter as an example, the first housing 100 can specifically be implemented as the top cover of the electricity meter, while the second housing 200 is implemented as a cover that covers the entire electricity meter. Of course, those skilled in the art will understand that this role allocation is not limiting; in other devices, the first housing 100 and the second housing 200 can be any two components that need to be locked together to prevent separation.

[0032] A first mating part 110 is provided on the first housing 100. Preferably, the first mating part 110 is a protrusion, rib or hook structure integrally extended from the inner surface or edge of the first housing 100, and has a predetermined geometry (e.g., a rectangular block or L-shaped block with a stop surface). The second housing 200 is provided with a second mating part 210. The second housing 200 and the first housing 100 are mated together during assembly. Specifically, when the first housing 100 and the second housing 200 are engaged or mated in a predetermined position and are in the final installed state, the first mating part 110 and the second mating part 210 are spatially opposite, adjacent, or staggered to each other, thereby jointly forming an installation space 400 with a specific contour. This installation space 400 is preferably an open slot, hole, or channel, with its entrance facing outwards for easy external operation.

[0033] Furthermore, the second housing 200 is also provided with a corresponding through hole 230. The position and size of the through hole 230 are designed to allow the first mating part of the first housing 100 to pass through. This structure helps to achieve nested fixation between the first housing 100 and the second housing 200, creating conditions for forming a compact lead seal structure.

[0034] The limiting member 300 is a component independent of the first housing 100 and the second housing 200, and its shape matches the outline of the mounting space 400, preferably in the form of a plate or column (hence the term "plate-type"). After the initial assembly of the first housing 100 and the second housing 200 is completed, the limiting member 300 is inserted into the mounting space 400.

[0035] Meanwhile, the limiting member 300 has the following relationship with the first mating part 110 and the second mating part 210: First direction (anti-detachment direction) limit: The first direction is defined as the direction in which the first housing 100 and the second housing 200 separate from each other, that is, the relative direction of movement when attempting to open or disassemble them, specifically as follows: Figure 1 As shown in the coordinate system. After the limiting member 300 is inserted into the installation space 400, the limiting member 300 and the first mating part 110 form a limiting fit along the first direction; or, the limiting member 300, the first mating part 110 and the second mating part 210 together form a limiting fit along the first direction.

[0036] In one specific embodiment, the first mating part 110 has a stop surface 111, and the limiting member 300 has a corresponding stopped surface. When the first housing 100 is subjected to an external force in a first direction (e.g., upward), the stop surface 111 abuts against the stopped surface, thereby transmitting the tension to the second housing 200 through the limiting member 300 (because the limiting member 300 also engages with the second mating part 210 in multiple directions, see below for details), ultimately preventing the separation of the first housing 100 and the second housing 200.

[0037] Second direction (anti-escape direction) limit: The second direction is defined as the direction in which the limiting member 300 disengages from the mounting space 400, i.e., the direction opposite to the insertion direction. After the limiting member 300 is fully inserted into the mounting space 400, the limiting member 300 forms a limiting engagement with the first mating part 110 and / or the second mating part 210 along the second direction.

[0038] For example, an elastic barb or protrusion 312 can be provided on the side wall of the limiting member 300, and a groove 212 can be provided on the corresponding inner wall of the first mating part 110 or the second mating part 210. When the limiting member 300 is inserted into place, the elastic barb 312 will engage in the groove 212, generating a mechanical interference that resists pull-out force. Alternatively, it can be achieved through interference fit, one-way locking teeth, or other methods. This second-direction limiting ensures that the limiting member 300 will not accidentally fall off due to vibration or slight contact during normal use, and can only be removed when it is damaged, thus achieving the sealing function of a traditional lead seal.

[0039] The first housing 100 and the second housing 200 are made of engineering plastics or metals with sufficient strength. The limiting member 300 may be made of a plastic material with low toughness and easy fracture, so that the limiting member will inevitably be damaged in case of illegal disassembly. In other embodiments, the shapes of the first mating part 110 and the second mating part 210 can be interchanged or have various geometric deformations (such as wedge, trapezoid, circle, etc.), as long as a mechanical interlock can be formed after the limiting member 300 is inserted. The position of the through hole 230 is not limited to the top of the second housing 200, but can also be on the side wall, with the through portion of the first housing 100 adjusted accordingly.

[0040] Example 1 refer to Figures 1 to 7 This embodiment provides a plate-type lead seal mechanism, which is particularly suitable for electricity meters. In this embodiment, the first housing 100 is the top cover of the electricity meter, the second housing 200 is the cover of the electricity meter, and the limiting member 300 is an independent plate-shaped locking member.

[0041] like Figure 1 As shown, a first mating portion 110 is integrally formed on the upper surface of the first housing 100 (i.e., the surface facing the interior of the second housing 200). Specifically, the first mating portion 110 is a first L-shaped block. The first L-shaped block includes a vertical section and a horizontal section.

[0042] The upper surface of the second housing 200 (i.e., the inner surface of the top wall opposite to its opening direction) is integrally formed with a second mating part 210. Specifically, the second mating part 210 is a second L-shaped block. The second L-shaped block also includes a vertical section and a horizontal section.

[0043] When the first housing 100 and the second housing 200 are in the installation state, the two vertical sections are arranged opposite each other in the horizontal direction, with a certain distance between them. That is, the first vertical section is located on the left (or front) side, and the second vertical section is located on the right (or rear) side, with the two arranged face to face and forming a gap in the middle.

[0044] Meanwhile, the first horizontal segment and the second horizontal segment are respectively positioned between the two vertical segments (i.e., within the internal space defined by the first and second vertical segments). Specifically, the first horizontal segment extends horizontally to the right from the top of the first vertical segment, and the second horizontal segment extends horizontally to the left from the top of the second vertical segment. When they meet, preferably the two horizontal segments are staggered accordingly, so that the line connecting them is not a coaxial straight line.

[0045] like Figure 4As shown, when the first housing 100 and the second housing 200 are in a normal installation state (i.e., the top cover and the cover are fastened in place), the first L-shaped block and the second L-shaped block are opposite each other, and their horizontal ends are either joined together or staggered vertically, thus forming an installation space 400 with a cross-section that is approximately rectangular or square. This installation space 400 is a channel extending horizontally (front-back direction), with its front opening (i.e., the inlet) facing the operator, and its rear end closed or formed by the joining of the two horizontal sections. Alternatively, a gap may be left for the front end of the limiting member to be inserted.

[0046] like Figure 3 As shown, a snap-fit ​​element 120 is also integrally formed on the first housing 100. This snap-fit ​​element 120 is preferably an elastic cantilever hook, extending upward from the top of the first housing 100 and having a hook portion facing the direction of the second mating part. When the first housing 100 and the second housing 200 are in the installed state, the snap-fit ​​element 120 engages with a corresponding hook groove or boss on the second housing 200, forming a preliminary limiting engagement along a first direction (i.e., the vertically upward direction in which the first housing 100 and the second housing 200 are separated from each other). In other words, before the limiting member 300 is inserted, the snap-fit ​​element 120 already provides a basic retaining force to prevent the top cover from accidentally detaching.

[0047] The second housing 200 is also provided with a through hole 230 (see the general description above). The first mating part of the first housing 100 passes through the through hole 230 to achieve precise positioning and nesting between the two. In this embodiment, both the first mating part and the snap fastener pass through the through hole. In order to achieve a limiting engagement with the snap fastener, the surface where the hook of the snap fastener is located contacts the edge of the through hole of the second housing, thereby using the edge of the through hole to engage with the hook to achieve limiting. Furthermore, an arc-shaped groove structure is provided on this edge as a second latch 240, such as... Figure 7 As shown, the corresponding fastener is a semi-cylinder with its arc surface facing the direction of the second fastening position, and the radius of the fastener is the same as the radius of the second fastening position.

[0048] like Figure 2 As shown, the limiting member 300 is generally elongated, and its length direction is consistent with the extension direction of the installation space 400. The limiting member 300 includes the following integrally formed or fixedly connected limiting body 310, symmetrically arranged buckle plates 320, limiting part 340 and sealing plate 330.

[0049] The cross-sectional shape of the limiting body 310 matches the cross-sectional shape of the installation space 400 (e.g., rectangular), allowing the limiting body 310 to be tightly inserted into the installation space 400. The front end of the limiting body 310 (i.e., the front end in the insertion direction) can be designed as a beveled guide surface to facilitate insertion.

[0050] Two snap plates 320 are integrally formed at the rear end of the limiting body 310 (i.e., the end opposite to the insertion direction, closer to the operator), and extend symmetrically to the left and right sides respectively. Each snap plate 320 has a forward-facing hook or protrusion at its end. Correspondingly, first fastening positions 220 are provided on the left and right side walls of the second housing 200, or on the corresponding side walls of the first housing 100, such as... Figure 5 As shown. Preferably, the first latch 220 is a groove or hole formed on the inner surface of the side wall of the second housing 200. When the limiting member 300 is fully inserted into the installation space 400, the latch plate 320 expands outward using its own elasticity and then rebounds, causing its hook to engage with the first latch 220, thereby restricting the movement of the limiting member 300 in the second direction (i.e., the direction of rearward disengagement from the installation space 400). The two symmetrically arranged latch plates 320 provide a balanced anti-disengagement force.

[0051] The bottom of the limiting body 310 (the lower surface in the inserted state) extends rearward (i.e., towards the operator) to form a protruding limiting part 340, such as... Figure 6 As shown. The limiting part 340 can be a horizontally extending thin plate or a protrusion. Simultaneously, a second latch 240 is provided at a corresponding position on the second housing 200 (e.g., on the bottom or side wall near the mounting space 400). The second latch 240 can be a forward-facing groove or a stepped surface. When the limiting member 300 is inserted into place, the limiting part 340 and the second latch 240 together form an additional limiting space. The size and position of this limiting space are set to precisely accommodate and restrict the latching member 120. Specifically, the latching member 120 originally hooks onto the second housing 200 in the vertical direction (first direction), but because the latching member 120 itself may be elastic, there is a potential possibility of it being pushed away in the opposite direction. The limiting space formed by the limiting part 340 and the second latch 240 firmly restrains the hook of the latching member 120 within it, preventing it from deforming and disengaging. In this way, the limiting member 300 indirectly enhances the locking effect of the buckle member 120 in the first direction. Even though the main anti-disengagement in the first direction is achieved by the cooperation of the first L-shaped block and the second L-shaped block with the limiting body 310, the cooperation between the buckle member 120 and the limiting part 340 further provides redundant locking.

[0052] The end of the limiting member 300 (i.e., the rear end, which is the end that the operator inserts last and can see) is provided with a sealing plate 330. The outline of the sealing plate 330 matches the inlet of the installation space 400. When the limiting member 300 is fully inserted, the sealing plate 330 fits precisely against the outer surface of the second housing 200 or the first housing 100 around the inlet of the installation space 400, completely sealing the inlet. The outer surface of the sealing plate 330 can be set to a flat surface.

[0053] The overall length of the limiting member 300 (the distance from the front end of the limiting body 310 to the inner surface of the sealing plate 330) is set to be basically consistent with the depth of the installation space 400 (i.e., the distance from the inlet to the closed end where the first L-shaped block and the second L-shaped block meet). In this way, when the limiting member 300 is fully inserted, the sealing plate 330 just contacts the edge of the inlet without any obvious gaps or protrusions, ensuring a neat appearance and reliable sealing.

[0054] During assembly, the operator first positions the first housing 100 (top cover) and the second housing 200 (cover) using conventional clips or screws. At this point, the first L-shaped block and the second L-shaped block align to form an installation space 400, and the clip 120 and the second housing 200 form a preliminary first-direction limit. Then, the operator takes the limiting piece 300, aligns its front end with the entrance of the installation space 400, and pushes it forward horizontally. As the limiting body 310 gradually enters the installation space 400, its sidewalls form sliding contact with the inner walls of the first and second L-shaped blocks. When the front end of the limiting body 310 contacts the joint of the horizontal sections of the two L-shaped blocks, it is pushed into place. At this moment, the hooks of the symmetrical buckle plate 320 snap into the first buckle position 220, making a "click" sound, thus achieving locking in the second direction (anti-disengagement). Simultaneously, the limiting space formed by the limiting part 340 and the second buckle position 240 abuts the front and rear sides of the buckle member 120, preventing it from moving towards the first mating part; the sealing plate 330 precisely seals the inlet. Since the length of the limiting member 300 is consistent with the depth of the installation space 400, the main body of the limiting member supports the first L-shaped block and the second L-shaped block. At this time, the first housing 100 and the second housing 200 cannot be separated without damaging the limiting member 300.

[0055] To legally open the seal, the limiting element 300 must be damaged, leaving obvious signs of damage to serve as a warning.

[0056] Example 2 refer to Figures 8 to 12 As shown, this embodiment provides another board-type lead seal mechanism, which is based on the same principle as Embodiment 1, but differs in structural details. It is particularly suitable for scenarios that require additional fixing (such as fastening with screws) while still requiring the lead seal to be tamper-proof. In this embodiment, the first housing 100 can also be the top cover of the energy meter, and the second housing 200 is the cover of the energy meter. However, in addition to the lead seal achieved by the limiting member 300, the two are also auxiliaryly fixed by at least one screw 500.

[0057] The difference from Embodiment 1 is that when the first housing 100 and the second housing 200 are in the installed state, they together form a receiving groove 600. This receiving groove 600 is used to receive a screw 500, which is a pan head screw. Specifically: The receiving groove 600 can be a semi-enclosed cavity formed by a partial recess in the lower surface of the first housing 100, while a corresponding cavity is also provided at a corresponding position on the upper surface of the second housing 200. When the two are closed, they together form a complete groove with an opening, such as... Figure 11 As shown.

[0058] Alternatively, the receiving groove 600 is entirely disposed on the second housing 200, while the first housing 100 is provided with a through hole or clearance opening at a corresponding position, so that the screw 500 passes through the first housing 100 and is screwed into the threaded hole at the bottom of the receiving groove 600.

[0059] The opening of the receiving groove 600 is preferably oriented toward the operator (i.e., on the same side or perpendicular to the entrance of the installation space 400) to facilitate the insertion of a screwdriver.

[0060] The screw 500 is installed in the receiving groove 600, such as Figure 10 As shown, its function is to provide additional mechanical connection force between the first housing 100 and the second housing 200, such as enhancing vibration resistance or providing redundant fixation to meet certain safety regulations. However, in this embodiment, the position of the screw 500 is designed such that when the limiting member 300 is in the inserted locking state, the limiting member 300 will block or cover the head of the screw 500, thus preventing the screw 500 from being touched or removed. In other words, the limiting member 300, on the one hand, seals the first housing 100 and the second housing 200, and on the other hand, protects the screw 500 from being unauthorized.

[0061] The limiting component 300 is plate-shaped as a whole, such as Figure 9 As shown, the length of the limiting member 300 is consistent with the depth of the installation space 400, ensuring that it completely fills the installation space 400 after insertion. It includes the following components: The limiting body 310 is similar to that in Embodiment 1. Its cross-sectional shape matches the cross-section of the installation space 400. It is used to insert into the installation space 400 and form a limiting fit with the first mating part 110 and the second mating part 210 along the first direction (anti-separation direction).

[0062] Two snap plates 320 are integrally formed at the rear end of the limiting body 310 (i.e., the rear end in the insertion direction, the end closer to the operator), and extend symmetrically to the left and right sides respectively. Each snap plate 320 has a hook or protrusion at its end for engaging with the first snap position 220 located on the side wall of the first housing 100 or the second housing 200, such as... Figure 12As shown. This snap-fit ​​restricts the movement of the limiting member 300 along the second direction (i.e., the direction of rearward disengagement from the installation space 400). It should be noted that, in this embodiment, the buckle plate 320 can be located on the left and right sides of the limiting body 310 and correspond to the first buckle position 220. Preferably, the buckle plate 320 is elastic, retracting inward when inserted and springing outward into the buckle position after being in place.

[0063] Meanwhile, one of the mating parts has a stop surface 111 at its upper end, which is used to cooperate with the limiting body to achieve limiting in the first direction.

[0064] The sealing plate 330 differs from the sealing plate 330 in Embodiment 1, which is located at the end of the limiting member 300. In this embodiment, the sealing plate 330 is integrally formed above the buckle plate 320. Specifically, the sealing plate 330 can be a horizontally extending thin plate with its end extending downwards, forming an L-shape with its lower surface connected to the upper surface of the limiting body (or connected via a transition section). When the limiting member 300 is fully inserted into the installation space 400, the sealing plate 330 is positioned outside the entrance of the installation space 400. Because it is located above the buckle plate 320, it naturally covers the entire entrance of the installation space 400, and also covers the opening of the receiving groove 600 (if the opening of the receiving groove 600 is adjacent to or connected to the entrance of the installation space 400). More preferably, the shape and size of the sealing plate 330 are designed such that when the limiting member 300 is locked, the sealing plate 330 not only covers the entrance of the installation space 400, but also completely covers the head of the screw 500, making the screw 500 invisible and preventing tools from being inserted. To achieve this effect, the opening of the receiving groove 600 is preferably located directly above the entrance of the installation space 400, and the sealing plate 330 extends accordingly in that direction. At the same time, the limiting member is inserted in the horizontal direction, so the end of the sealing plate extends downward to block the opening in the insertion direction, thereby completely sealing the entire installation space.

[0065] In this embodiment, the limiting member 300 simultaneously performs three functions: ① locking the first housing 100 and the second housing 200 so that they cannot be separated; ② preventing itself from being pulled out; ③ protecting the screw 500 from being disassembled. Similarly, when disassembly is required, the limiting member needs to be broken.

[0066] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A plate-type lead seal mechanism, characterized in that: The first housing (100) is provided with a first mating part (110); The second housing (200) is provided with a second mating part (210). The second housing (200) and the first housing (100) are installed together, and when the two are in the installation state, the first mating part (110) and the second mating part (210) together form an installation space (400). A limiting member (300) is inserted into the installation space (400). The limiting member (300) forms a limiting fit with the first mating part (110) along a first direction or forms a limiting fit with both of them along a first direction, the first direction being the direction in which the first housing (100) and the second housing (200) are separated from each other; The limiting member (300) forms a limiting engagement with the first mating part (110) and / or the second mating part (210) along a second direction, which is the direction in which the limiting member (300) disengages from the mounting space (400).

2. The plate-type lead seal mechanism according to claim 1, characterized in that: The second housing (200) is provided with a through hole (230) through which the first housing (100) can pass.

3. The plate-type lead seal mechanism according to claim 1, characterized in that: The first mating part (110) is a first L-shaped block integrally formed on the upper surface of the first housing (100), and the second mating part (210) is a second L-shaped block integrally formed on the upper surface of the second housing (200). When the two are in the installation state, the upper ends of the first L-shaped block and the second L-shaped block are connected to each other to form the installation space (400).

4. The plate-type lead seal mechanism according to claim 3, characterized in that: The first housing (100) is provided with a buckle (120). When the first housing (100) and the second housing (200) are in the installation state, the buckle (120) and the second housing (200) form a limiting engagement along the first direction.

5. A plate-type lead seal mechanism according to claim 4, characterized in that: The limiting member (300) includes: Limiting body (310); The symmetrically arranged buckle plates (320) are integrally formed at the rear end of the limiting body (310) and engage with the first buckle (220) provided on the side wall of the first housing (100) or the second housing (200) to form a limiting fit along the second direction.

6. A plate-type lead seal mechanism according to claim 5, characterized in that: The bottom of the limiting body (310) extends backward to form a limiting part (340), and a limiting space for the limiting fastener (120) is formed between the limiting part (340) and the second fastener (240) on the second housing (200).

7. A plate-type lead seal mechanism according to claim 5 or 6, characterized in that: The end of the limiting member (300) is provided with a sealing plate (330), which is adapted to the inlet shape of the installation space (400).

8. A plate-type lead seal mechanism according to claim 7, characterized in that: The length of the limiting member (300) is consistent with the depth of the installation space (400).

9. A plate-type lead seal mechanism according to claim 1, characterized in that: The first housing (100) and the second housing (200) together form a receiving groove (600) for accommodating the screw (500).

10. A plate-type lead seal mechanism according to claim 9, characterized in that: The limiting member (300) includes: Limiting body (310); The symmetrically arranged buckle plates (320) are integrally formed on the rear end of the limiting body (310) and form a limiting fit with the first buckle (220) provided on the side wall of the first housing (100) or the second housing (200) in the second direction; The sealing plate (330) is integrally formed above the buckle plate (320) and covers the entrance of the entire installation space (400).

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