Modularized plugging device for convenient construction of cable trench

Abstract

The invention discloses a modular plugging device for cable trench convenient construction, which comprises plugging elements, the plugging elements are stacked to form a plugging unit, cable adapters are arranged on the stacking surfaces of the plugging elements, and after the adjacent plugging elements are stacked, the cable adapters enclose to form a cable body channel; the positioning and guiding elements penetrate through the plugging unit to achieve overall positioning and guiding, the adjacent plugging elements are fixedly connected through locking pieces to form a plugging wall body, detachable and reconfigurable modular design is adopted, and the plugging wall body is assembled in the mode that guiding rods penetrate through for positioning and screws are locked. And a pure mechanical automatic fire extinguishing mechanism of fuse wire temperature-sensitive triggering and torsional spring mechanical triggering is designed, and an external power supply and manual intervention are not needed. The device achieves the quick suppression and extinguishment of a fire, fills a gap that a conventional plugging technology lacks an active fire extinguishing function, and greatly improves the operation safety of a cable trench.

Description

Technical Field

[0001] This invention relates to the field of fire safety, and in particular to a modular sealing device for convenient construction of cable trenches. Background Technology

[0002] With the rapid development of power systems, the number of newly built substations and renovation and expansion projects is increasing. As the core carrier of power transmission, cables are widely laid using cable trench technology. During long-term operation, cable trenches need to meet multiple requirements such as cable laying, maintenance, and capacity expansion. The sealing of cable trenches is a key link in ensuring the safe and stable operation of the power system.

[0003] Currently, existing cable trench sealing technologies mainly employ methods such as concrete brick masonry sealing and fireproof bag stacking sealing. While concrete brick masonry sealing, which forms a closed structure through on-site casting or masonry, possesses a certain degree of structural stability, it also has significant drawbacks. When substations undergo renovation or expansion requiring the addition of new cables or the removal of old cables, the existing concrete sealing structure must be demolished. This demolition process is not only difficult and inefficient but also highly susceptible to accidentally damaging cables in adjacent operating bays, posing a safety risk. Furthermore, when resealing after demolition, it is difficult to ensure that the sealing density is consistent with the original structure, resulting in a decline in sealing quality, ineffective prevention of small animal intrusion, and a significant reduction in fire resistance.

[0004] While fireproof bags offer greater ease of removal compared to concrete sealing, the overall structure formed by stacking fireproof bags is poor, with numerous gaps that make it difficult to achieve an effective seal. This results in inadequate protection against small animals and fire. After repeated removal and re-stacking, the fireproof bags are prone to breakage and scattering, further diminishing their sealing performance. Moreover, their low reusability increases construction costs and waste disposal pressure.

[0005] Existing sealing technologies only focus on basic sealing and protection functions, lacking proactive prevention and control designs for cable trench fires. Cable trenches contain densely packed cables, and once a fire is triggered by overload, short circuit, or other reasons, the fire can spread rapidly. Traditional sealing structures cannot suppress the spread of fire, and fire fighting is extremely difficult due to the confined space of the cable trench, which can easily cause large-scale power outages and pose a serious threat to the safe operation of the power grid. Summary of the Invention

[0006] Therefore, the technical problem to be solved by this invention is that cable trench sealing technology has technical defects such as difficulty in disassembly and assembly, high construction risk, easy degradation of sealing quality, and lack of active fire extinguishing function.

[0007] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a modular sealing device for convenient construction of cable trenches, which includes sealing elements, the sealing elements are stacked to form a sealing unit, the stacking surface of the sealing elements is provided with cable adapters, and the cable adapters surround and form a cable body channel after adjacent sealing elements are stacked. A positioning and guiding element, which penetrates the sealing unit to achieve overall positioning and guidance, and adjacent sealing elements are fixedly connected by locking members to form a sealing wall; and A fire extinguishing element, comprising a fire extinguishing component and a triggering mechanism, wherein the fire extinguishing component is disposed within the sealing element, and the triggering mechanism is linked to the fire extinguishing component to trigger the activation of the fire extinguishing component when a thermal anomaly occurs in the cable trench.

[0008] In a preferred embodiment of the modular sealing device for convenient construction of cable trenches according to the present invention: the sealing unit includes a sealing isolation module and a sealing branch module, the sealing isolation module and the sealing branch module are stacked to form a sealing unit, and the sealing branch module is located at the bottom end of the sealing isolation module.

[0009] In a preferred embodiment of the modular sealing device for convenient construction of cable trenches according to the present invention: the cable adapter includes cable clamping grooves provided on the upper and lower surfaces of the sealing isolation module and the sealing branch module, and the cable clamping grooves are arranged to form a cable through hole after adjacent sealing isolation modules and sealing branch modules are stacked.

[0010] In a preferred embodiment of the modular sealing device for convenient construction of cable trenches described in this invention: the outer walls of the sealing isolation module and the sealing branch module are provided with multiple weight-reducing hollows, and the interior of the sealing isolation module is provided with an internal cavity, which is a through-type structure for the diffusion of aerosol extinguishing medium to form a closed extinguishing space.

[0011] In a preferred embodiment of the modular sealing device for convenient construction of cable trenches according to the present invention: both the sealing isolation module and the sealing branch module are integrally cast from epoxy resin material, the cable pressing groove is an arc-shaped structure, and multiple sets of the cable pressing grooves are evenly distributed along the length direction of the sealing branch module.

[0012] In a preferred embodiment of the modular sealing device for convenient construction of cable trenches according to the present invention: the positioning and guiding element includes a guide rod disposed at the top of the sealing and isolation module. The guide rod has a cylindrical structure. The top of the sealing and isolation module and the sealing branch module are provided with insertion holes adapted to the guide rod. The guide rod is inserted into the insertion holes to ensure vertical alignment when the modules are stacked.

[0013] In a preferred embodiment of the modular sealing device for convenient construction of cable trenches according to the present invention: the locking member includes screw pre-drilled holes provided on the front and rear side walls of the sealing isolation module and the sealing branch module, and the screw pre-drilled holes cooperate with the screw body to achieve lateral locking and fixing of adjacent modules.

[0014] In a preferred embodiment of the modular sealing device for convenient construction of cable trenches according to the present invention: the triggering mechanism includes a fusion wire disposed on the side wall of the sealing isolation module and the sealing branch module, the side wall of the sealing isolation module is provided with a torsion spring mounting groove, and the torsion spring body is disposed inside the torsion spring mounting groove.

[0015] In a preferred embodiment of the modular sealing device for convenient construction of cable trenches according to the present invention: a trigger baffle is provided inside the torsion spring mounting groove, and when the two ends of the trigger baffle are connected to the torsion spring mounting groove, they are also connected to the torsion spring body. The fusible wire is fixed to the outside of the sealing and branching module by fixing screws, and the fusible wire forms a locking fit with the trigger baffle, so that the trigger baffle remains in the ready position under normal conditions.

[0016] In a preferred embodiment of the modular sealing device for convenient construction of cable trenches according to the present invention: the fire extinguishing component includes an aerosol fire extinguisher disposed in the sealing and isolation module, and the aerosol fire extinguisher is provided with a mechanical trigger button and a safety pull ring; The trigger baffle corresponds to the mechanical trigger button. When the fuse is heated and breaks, the torsion spring body drives the trigger baffle to rebound and trigger the mechanical trigger button. The safety pull ring is used to prevent the aerosol fire extinguisher from being accidentally triggered during installation.

[0017] The beneficial effects of this invention are as follows: it adopts a detachable modular design and a guide rod positioning and screw locking assembly method, which makes disassembly and assembly simple and efficient. Partial disassembly and assembly can meet the needs of adding or removing cables, avoiding the problems of traditional sealing and removal being difficult and easily damaging cables, and reducing construction risks and workload.

[0018] The sealing unit is integrally cast from epoxy resin, featuring a cable clamping groove structure for strong sealing performance. It effectively prevents small animals and moisture damage, and is flame-retardant and anti-aging, ensuring long-term stable sealing quality. It incorporates a built-in aerosol fire extinguisher and a purely mechanical automatic fire suppression mechanism, requiring no external power supply. It can be triggered instantly in case of fire, quickly creating a closed fire suppression space, filling the gap in traditional sealing methods that lack active fire suppression capabilities and improving operational safety. The modules can be flexibly combined, with pre-drilled through holes of various sizes to accommodate different cable requirements. The weight-reducing, hollow design facilitates construction in confined spaces, reduces sealing costs, and offers high versatility. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A schematic diagram of the overall structure of a modular sealing device for convenient cable trench construction is shown. Figure 2 A schematic diagram of the trigger mechanism for the fire extinguishing element of a modular sealing device for convenient cable trench construction is shown. Figure 3 A schematic diagram of the internal structure of the sealing and isolation module of the modular sealing device for convenient cable trench construction is shown; Figure 4 A cross-sectional schematic diagram of a modular sealing device for convenient cable trench construction is shown; Figure 5 for Figure 3 Enlarged structural diagram at point B; Figure 6 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 7 A schematic diagram of the trigger mechanism rebound structure of a modular sealing device for convenient cable trench construction is shown. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0022] Reference Figures 1-3 This embodiment provides a modular sealing device for convenient cable trench construction. This device is designed specifically for the sealing and protection needs of substation cable trenches and the convenience of construction. It integrates multiple functions such as sealing, rodent prevention and flame retardancy, and automatic fire extinguishing. It can adapt to the frequent construction scenarios of adding and removing cables during the renovation and expansion of cable trenches. It effectively solves the problems of difficult disassembly and assembly and poor protection effect of traditional sealing methods. Its core structure includes sealing element 1, positioning and guiding element 2 and fire extinguishing element 3. The components work together to achieve reliable sealing and safety protection functions.

[0023] The sealing element 1 is stacked to form a sealing unit 11. The stacked surface of the sealing element 1 is provided with a cable adapter 12. After adjacent sealing elements 1 are stacked, the cable adapter 12 surrounds and forms a cable body 13 channel. The sealing element 1 is the core sealing carrier of the device. It adopts a modular design and can be flexibly combined according to the actual size of the cable trench. Multiple sealing elements 1 are stacked longitudinally to form a complete sealing unit 11, which can fully cover the cross-section of the cable channel and achieve a closed isolation effect. The upper and lower stacked surfaces of the sealing element 1 are integrally formed with cable adapters 12. The cable adapter 12 is a preset structure adapted to the shape of the cable. When two adjacent sealing elements 1 are precisely stacked, the corresponding cable adapters 12 surround each other to form a cable channel that matches the cable body 13. This ensures that the cable can pass smoothly through the sealing structure and can also limit and fix the cable through the structural fit, thereby improving the sealing tightness.

[0024] Positioning and guiding element 2 penetrates the sealing unit 11 to achieve overall positioning and guidance. Adjacent sealing elements 1 are fixedly connected by locking element 21 to form a sealing wall. Positioning and guiding element 2 is the core of the assembly positioning of sealing unit 11. It penetrates the upper and lower ends of the entire sealing unit 11, providing a precise positioning benchmark and guidance for the stacking process of each sealing element 1, avoiding misalignment and tilting problems during module stacking. At the same time, adjacent sealing elements 1 are horizontally fixedly connected by locking element 21, so that multiple dispersed sealing elements 1 form a structurally stable and tightly sealed overall sealing wall, effectively preventing small animals from entering and flames from spreading, and ensuring the safe operation of the cable trench.

[0025] The fire extinguishing element 3 includes a fire extinguishing component 31 and a triggering mechanism 32. The fire extinguishing component 31 is installed inside the sealing element 1. The triggering mechanism 32 is linked with the fire extinguishing component 31 to activate the fire extinguishing component 31 when a thermal anomaly occurs in the cable trench. The fire extinguishing element 3 is the core component of the fire prevention and control system. It includes the fire extinguishing component 31 and the triggering mechanism 32, which form a linkage mechanism. The fire extinguishing component 31 is pre-embedded in a preset installation position inside the sealing element 1 to ensure that the extinguishing medium can accurately act on the cable channel area when released. The triggering mechanism 32 maintains a preset linkage relationship with the fire extinguishing component 31 and has the ability to sense thermal anomalies. When a thermal anomaly such as cable overheating or short circuit combustion occurs in the cable trench, it can automatically trigger the fire extinguishing component 31 to activate quickly and suppress the spread of fire in a timely manner.

[0026] Reference Figures 2-4As an optional embodiment, the sealing unit 11 includes a sealing isolation module 111 and a sealing branch module 112. The sealing isolation module 111 and the sealing branch module 112 are stacked to form the sealing unit 11, and the sealing branch module 112 is located at the bottom end of the sealing isolation module 111. Both the sealing isolation module 111 and the sealing branch module 112 are standardized modular structures, and the number and combination of stacking can be flexibly selected according to actual construction needs. The sealing isolation module 111 and the sealing branch module 112 are stacked longitudinally to form a complete sealing unit 11, wherein the sealing branch module 112 is located at the bottom end of the sealing isolation module 111 and is fitted to the bottom of the cable trench to form a bottom support and cable branching guide foundation.

[0027] The cable adapter 12 includes cable clamping grooves 121 on both the upper and lower surfaces of the sealing isolation module 111 and the sealing branch module 112. When adjacent sealing isolation modules 111 and sealing branch modules 112 are stacked, the cable clamping grooves 121 enclose a cable through hole. When the sealing isolation module 111 and sealing branch module 112 are precisely stacked, the corresponding upper and lower cable clamping grooves 121 together enclose a circular cable through hole. This through hole not only meets the cable passage requirements but also achieves a seal through the clamping action of the grooves on the cable, preventing air leakage and small animals from entering.

[0028] The outer walls of the sealing and isolation module 111 and the sealing and branching module 112 are provided with multiple weight-reducing cutouts 113. These cutouts 113 significantly reduce the weight of the module without compromising its overall structural strength, making it easier for construction personnel to handle, hoist, and install the module in confined cable trenches. The sealing and isolation module 111 has an internal cavity 114, which is a through-type structure used for the diffusion of aerosol extinguishing media to form a closed extinguishing space. When the extinguishing device 31 is activated, the extinguishing media can quickly diffuse within the internal cavity 114 and form a closed extinguishing space, thereby improving extinguishing efficiency.

[0029] Both the sealing and isolation module 111 and the sealing and branching module 112 are integrally cast from epoxy resin material. This material has excellent flame retardant properties, mechanical strength and anti-aging ability, and also has moisture-proof and rodent-proof properties. It can adapt to the humid and dusty operating environment of cable trenches for a long time. The cable clamping groove 121 has an arc-shaped structure. Multiple sets of cable clamping grooves 121 are evenly distributed along the length of the sealing and branching module 112. The combination of grooves at different positions can form cable through holes of different specifications, which can meet the simultaneous laying needs of various types of cables.

[0030] Reference Figures 3-4 and Figure 6In one embodiment provided in this application, the positioning guide element 2 includes a guide rod 22 disposed at the top of the sealing and isolation module 111. The guide rod 22 has a cylindrical structure. The top of the sealing and isolation module 111 and the sealing and branching module 112 are provided with insertion holes adapted to the guide rod 22. The guide rod 22 is inserted into the insertion holes to ensure vertical alignment when the modules are stacked. The guide rod 22 is made of high-strength metal material and has a cylindrical structure. Its length is adapted to the total height of the sealing unit 11 to ensure that it can penetrate the entire sealing unit. The top of the sealing and isolation module 111 and the sealing and branching module 112 are pre-machined with insertion holes that are precisely adapted to the outer diameter of the guide rod 22. During installation, the guide rod 22 is inserted into the insertion holes of each module from top to bottom. Through the constraint of the rod body and the insertion holes, it is ensured that all modules remain vertically aligned during the stacking process, thereby improving the overall flatness and sealing performance of the sealing wall. The locking component 21 includes screw pre-drilled holes 211 provided on the front and rear side walls of the sealing isolation module 111 and the sealing branch module 112. The screw pre-drilled holes 211 are internal threaded holes that are compatible with the matching screw bodies. The screw pre-drilled holes 211 and the screw bodies cooperate to achieve lateral locking and fixing of adjacent modules. The adjacent modules are firmly connected into one body by the threaded locking force to form a structurally stable sealing wall, which effectively resists external impact and internal air pressure, and ensures the long-term reliable operation of the sealing structure.

[0031] Reference Figures 5-7 In some embodiments, the triggering mechanism 32 includes a fusion wire 321 disposed on the side wall of the blocking isolation module 111 and the blocking branch module 112. The side wall of the blocking isolation module 111 is provided with a torsion spring mounting groove 322. The torsion spring body 323 is disposed inside the torsion spring mounting groove 322. The torsion spring body 323 has reliable elastic reset capability and provides a power source for triggering action.

[0032] The torsion spring mounting groove 322 is provided with a trigger baffle 324. When the two ends of the trigger baffle 324 are connected to the torsion spring mounting groove 322, they are also connected to the torsion spring body 323. The torsion spring body 323 always applies an elastic force to the trigger baffle 324. The fusible wire 321 is made of a heat-sensitive material and is fixed to the outer wall of the blocking and branching module 112 by fixing screws 212. One end of the fusible wire 321 forms a locking fit with the free end of the trigger baffle 324. Under normal temperature conditions, the fusible wire 321 remains taut, limiting and fixing the trigger baffle 324 in the preparatory position. At this time, the torsion spring body 323 is in a compressed and stored state. The fuse 321 is fixed to the outside of the blocking branch module 112 by the fixing screw 212, and the fuse 321 and the trigger baffle 324 form a locking engagement, so that the trigger baffle 324 is kept in the ready position under normal conditions.

[0033] The fire extinguishing device 31 includes an aerosol fire extinguisher 311 installed in the sealing and isolation module 111. The fire extinguisher adopts a passive design and can be activated without external power. The aerosol fire extinguisher 311 is equipped with a mechanical trigger button 312 and a safety pull ring 313. The trigger baffle 324 corresponds to the mechanical trigger button 312. When the fuse 321 melts due to heat, the torsion spring body 323 drives the trigger baffle 324 to rebound and trigger the mechanical trigger button 312. The safety pull ring 313 is used to prevent the aerosol fire extinguisher 311 from being accidentally triggered during installation. The free end of the trigger baffle 324 corresponds precisely to the position of the mechanical trigger button 312. When a thermal anomaly occurs in the cable trench, causing the fuse 321 to melt due to heat, the trigger baffle 324 loses its locking constraint. The torsion spring body 323 releases its elastic potential energy to drive the trigger baffle 324 to rebound quickly, and its free end accurately triggers the mechanical trigger button 312, realizing the automatic activation of the fire extinguisher. The safety pull ring 313 remains in the in-situ during the installation of the device to prevent accidental activation of the trigger button 312 during installation. After the overall installation and debugging of the device is completed, the safety pull ring 313 is removed to put the fire extinguishing system into standby mode.

[0034] The sealing unit 11 is formed by stacking the sealing elements 1. The guide rod 22 of the positioning and guiding element 2 passes through the insertion holes of each module, providing precise positioning and guidance for the stacking process and ensuring that the modules are vertically aligned without misalignment. Adjacent modules are laterally locked by the screw body of the locking element 21 passing through the screw pre-drilled hole 211, so that the dispersed sealing modules form a stable overall sealing wall, achieving reliable sealing of the cable passage. At the same time, the cable clamping grooves 121 on the upper and lower surfaces of the sealing module form a cable body 13 channel that can accommodate cables of different specifications after the modules are stacked. This not only meets the cable passage requirements, but also limits and clamps the cable through the arc-shaped grooves, ensuring the sealing tightness and effectively preventing small animals from entering.

[0035] Both the sealing and isolation module 111 and the sealing and branching module 112 are integrally cast from epoxy resin, possessing flame-retardant, rodent-proof, moisture-proof, and anti-aging properties. Multiple weight-reducing perforations 113 on the outer wall of the module significantly reduce its weight without compromising structural strength, facilitating handling and installation in confined cable trench spaces. The through-type internal cavity 114 inside the sealing and isolation module 111 is specifically designed for fire extinguishing, providing a diffusion channel and retention space for the extinguishing medium, ensuring the formation of a locally sealed fire extinguishing zone in the event of a fire.

[0036] The aerosol fire extinguisher 311 of the fire extinguishing element 3 is pre-embedded in the sealing and isolation module 111. During installation, the safety pull ring 313 provides protection against accidental activation. After the entire device is installed, the safety pull ring 313 is removed, and the fire extinguishing system enters the standby state. During normal operation, the fuse 321 of the triggering mechanism 32 remains intact, locking the trigger baffle 324 in the ready position, and the torsion spring body 323 is in a charged state. When the cable in the cable trench overheats or burns, the high temperature causes the heat-sensitive material fuse 321 to melt, the trigger baffle 324 loses its locking constraint, and the torsion spring body 323 releases its elastic force to drive the trigger baffle 324 to rebound quickly, accurately striking the mechanical trigger button 312 of the aerosol fire extinguisher 311 and activating the fire extinguishing device. The aerosol extinguishing medium is rapidly released and fills the internal cavity 114 and the surrounding area, forming a high-concentration extinguishing environment. It envelops and suffocates the burning cable, quickly extinguishes the local fire, and prevents the fire from spreading. The entire extinguishing process does not require external power or human intervention, and relies entirely on the mechanical structure response, making it suitable for the complex operating environment of cable trenches.

[0037] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A modular sealing device for convenient construction of cable trenches, characterized in that: include, A blocking element (1) is stacked to form a blocking unit (11). The stacked surface of the blocking element (1) is provided with a cable adapter (12). After adjacent blocking elements (1) are stacked, the cable adapter (12) surrounds to form a cable body (13) channel. A positioning guide element (2) penetrates the sealing unit (11) to achieve overall positioning and guidance. Adjacent sealing elements (1) are fixedly connected by locking members (21) to form a sealing wall. Fire extinguishing element (3), the fire extinguishing element (3) includes a fire extinguishing component (31) and a triggering mechanism (32). The fire extinguishing component (31) is disposed in the sealing element (1). The triggering mechanism (32) is linked with the fire extinguishing component (31) and is used to trigger the fire extinguishing component (31) to start when a thermal abnormality occurs in the cable trench.

2. The modular sealing device for convenient construction of cable trenches according to claim 1, characterized in that: The blocking unit (11) includes a blocking isolation module (111) and a blocking branch module (112). The blocking isolation module (111) and the blocking branch module (112) are stacked to form the blocking unit (11), and the blocking branch module (112) is located at the bottom of the blocking isolation module (111).

3. The modular sealing device for convenient construction of cable trenches according to claim 2, characterized in that: The cable adapter (12) includes cable clamping grooves (121) provided on the upper and lower surfaces of the blocking isolation module (111) and the blocking branch module (112). After the adjacent blocking isolation module (111) and blocking branch module (112) are stacked, the cable clamping grooves (121) surround and form a cable through hole.

4. The modular sealing device for convenient construction of cable trenches according to claim 3, characterized in that: The outer walls of the sealing and isolation module (111) and the sealing and branching module (112) are provided with multiple weight-reducing hollows (113). The sealing and isolation module (111) has an internal cavity (114) inside. The internal cavity (114) is a through structure, which is used for the diffusion of aerosol extinguishing medium to form a closed extinguishing space.

5. The modular sealing device for convenient construction of cable trenches according to claim 4, characterized in that: Both the blocking and isolation module (111) and the blocking and branching module (112) are integrally cast from epoxy resin material. The cable pressing groove (121) has an arc-shaped structure, and multiple sets of the cable pressing grooves (121) are evenly distributed along the length of the blocking and branching module (112).

6. The modular sealing device for convenient construction of cable trenches according to claim 5, characterized in that: The positioning guide element (2) includes a guide rod (22) disposed at the top of the sealing isolation module (111). The guide rod (22) is a cylindrical structure. The top of the sealing isolation module (111) and the sealing branch module (112) are provided with insertion holes adapted to the guide rod (22). The guide rod (22) is inserted into the insertion hole to ensure vertical alignment when the modules are stacked.

7. The modular sealing device for convenient construction of cable trenches according to claim 6, characterized in that: The locking component (21) includes screw pre-drilled holes (211) provided on the front and rear side walls of the sealing isolation module (111) and the sealing branch module (112). The screw pre-drilled holes (211) cooperate with the screw body to achieve lateral locking and fixing of adjacent modules.

8. The modular sealing device for convenient construction of cable trenches according to claim 7, characterized in that: The triggering mechanism (32) includes a fusion wire (321) disposed on the side wall of the blocking isolation module (111) and the blocking branch module (112). The side wall of the blocking isolation module (111) is provided with a torsion spring mounting groove (322), and the inside of the torsion spring mounting groove (322) is provided with a torsion spring body (323).

9. The modular sealing device for convenient construction of cable trenches according to claim 8, characterized in that: The inside of the torsion spring mounting groove (322) is provided with a trigger baffle (324). When the two ends of the trigger baffle (324) are connected to the torsion spring mounting groove (322), they are also connected to the torsion spring body (323). The fusible wire (321) is fixed to the outside of the blocking branch module (112) by a fixing screw (212), and the fusible wire (321) and the trigger baffle (324) form a locking engagement, so that the trigger baffle (324) remains in the ready position under normal conditions.

10. The modular sealing device for convenient construction of cable trenches according to claim 9, characterized in that: The fire extinguishing device (31) includes an aerosol fire extinguisher (311) installed in the sealing and isolation module (111), and the aerosol fire extinguisher (311) is equipped with a mechanical trigger button (312) and a safety pull ring (313). The trigger baffle (324) corresponds to the mechanical trigger button (312). When the fuse (321) is heated and melted, the torsion spring body (323) drives the trigger baffle (324) to rebound and trigger the mechanical trigger button (312). The safety pull ring (313) is used to prevent the aerosol fire extinguisher (311) from being accidentally triggered during installation.

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