Fireproof embedded cable bridge connecting piece, cable bridge device and use method thereof

Abstract

The application discloses a fireproof embedded cable bridge connecting piece, a cable bridge device and a use method thereof, and belongs to the technical field of cable bridges. The fireproof embedded cable bridge connecting piece comprises a connecting shell embedded in a concrete floor slab, and further comprises: a positioning wing plate, which is arranged at least in two and symmetrically on the outer side of the connecting shell, and the surface of the positioning wing plate is provided with anti-rotation tooth patterns and an annular boss; a split connecting head, which is arranged in two and respectively at the upper and lower ends of the connecting shell; and a composite cushion layer, which is wrapped on the outer sidewall of the connecting shell. By adopting the "galvanized steel plate-ceramic silica gel" composite structure, integrating a three-stage sealing system and a honeycomb space truss reinforcing rib, the fireproof limit of more than 2 hours at 950 DEG C high temperature and the compression strength of 300kN are realized, and the industry problems of poor fire resistance, easy deformation and existence of "chimney effect" of the traditional bridge are solved.

Description

Technical Field

[0001] This invention relates to the field of cable tray technology, and in particular to a fireproof concealed cable tray connector, a cable tray device, and its usage method. Background Technology

[0002] In modern buildings such as high-rise buildings, subways, and data centers, cable tray systems serve as the "main arteries" of power transmission, and their safety and reliability are of paramount importance. To achieve both aesthetic appeal and efficient space utilization, the application of concealed cable trays (i.e., cable trays and connectors pre-embedded in concrete floor slabs or walls) is becoming increasingly widespread.

[0003] Chinese patent publication number CN218415665U discloses a flame-retardant and fireproof cable tray, comprising a tray body and a tray cover. The tray body has fixing blocks on both sides, and the tray cover has grooves on both sides of its bottom end for use with the fixing blocks. Both the tray body and the tray cover have a fire-retardant coating on their exterior. The tray cover has a sealing plate at its bottom, and cavities on both sides of the sealing plate. Limiting posts are inserted into the cavities, and springs are provided on the inner wall of the cavities and one end of the limiting posts. Limiting holes for use with the limiting posts are provided on both sides of the tray body, and openings are provided at the bottom of the cavities. A lever plate passes through the opening on one side of the bottom end of each limiting post. This patented technology achieves flame-retardant and fireproof performance through the fire-retardant coating on the tray body and the tray cover. However, traditional concealed cable tray connectors have revealed several technical bottlenecks that urgently need to be addressed in long-term practice, especially serious deficiencies in the combination of fire safety, structural stability, and installation reliability. Firstly, traditional connectors pose significant safety hazards in terms of fire resistance. Currently, Q235 carbon steel is commonly used for the connector body, which has an extremely low fire resistance limit. When the ambient temperature reaches 300℃, the steel undergoes significant creep and softening, leading to structural instability and deformation. In real fire scenarios (temperatures can reach 800℃-1000℃), the connectors will collapse rapidly, causing cables to break. This not only interrupts the power supply to fire-fighting equipment but also creates a "chimney effect," accelerating the spread of flames and toxic fumes along the internal channels of the cable tray to other floors, posing a major fire hazard. Although measures such as external fireproofing can be used, these methods are cumbersome to implement, prone to loose wrapping, and easily detach, making reliability difficult to guarantee. Secondly, in terms of sealing and fireproofing, traditional processes are outdated and ineffective. The commonly used fireproof bags or fireproof putty filling methods have the following problems: (1) The filling quality is highly dependent on the worker's skill, and it is easy to have incomplete sealing and gaps; (2) The material may dry and shrink after long-term use, forming hidden fire transmission channels; (3) Poor seismic performance, slight vibration or settlement of the floor slab can cause cracks between the sealing layer and the connecting parts, resulting in loss of sealing. This "secondary sealing" process has become a weak link in fire compartmentation; Furthermore, in terms of structural stability and installation accuracy, traditional embedded parts are difficult to control. The vibration operation during the concrete pouring process can easily cause the embedded parts to shift, deflect or sink, making it difficult to guarantee installation accuracy (the tolerance often exceeds ±5mm). This brings great difficulties to the subsequent cable tray installation, often requiring the cable tray to be forcibly pulled or the holes to be enlarged, which not only damages the structural strength but also affects the overall aesthetics. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art, and to propose a fireproof buried cable tray connector, cable tray device and its usage method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fireproof concealed cable tray connector includes a connecting shell embedded in a concrete floor slab, and further includes: Positioning wing plates, at least two of which are symmetrically arranged on the outside of the connecting housing, and the surface of the positioning wing plates is provided with anti-rotation teeth and annular bosses; The connector is a split type, and there are two split connectors, which are respectively located at the upper and lower ends of the connecting housing; And a composite cushion layer, which covers the outer wall of the connecting shell and is used to form a seismic buffer interface with the concrete floor slab.

[0006] Preferably, the connecting shell is hot-pressed composite of galvanized steel plate and ceramicized silicone layer, wherein the ceramicized silicone layer expands at a temperature of 300°C or above to form a honeycomb fire-resistant barrier. The connecting shell includes an outer shell, an inner shell, and honeycomb-shaped space truss reinforcing ribs disposed between the outer shell and the inner shell. The composite pad is fixed to the outer shell by dovetail groove embedded connection. The composite pad includes a rubber layer, an aluminum silicate fiber layer, and a polyurethane damping layer disposed sequentially.

[0007] Preferably, it also includes a three-stage sealing system, the three-stage sealing system comprising: The first-level sealing element is a ceramicized silicone rubber fireproof strip installed on the outer side of the composite pad layer at the interface with the concrete floor slab, used for sealing when it expands due to heat. The second-level sealant is a fireproof sealant injected into the openings of the connecting housing and the surrounding concrete floor slab. The third-level seal is an adjustable mechanical compression sealing device integrated into the split connector.

[0008] Preferably, the split connector includes a first spherical shell fixedly connected to the opening of the connecting housing, a first ball tube rotatably connected inside the first spherical shell, a second spherical shell movably connected to the end of the first ball tube away from the first spherical shell, and a second ball tube rotatably connected inside the second spherical shell. The first ball tube and the second spherical shell are slidably configured with keyways, and an expanded graphite sealing ring is fixedly provided at the end of the second ball tube.

[0009] Preferably, the third-stage seal includes a second connecting plate fixed on the second spherical shell, a first screw rotatably connected to the second connecting plate, a first sleeve threadedly connected to the first screw, and a U-shaped insert plate fixedly connected to the first sleeve. The second spherical tube has a first insertion hole that mates with the U-shaped insert plate.

[0010] Preferably, both the first and second spherical shells are provided with limiting components. The limiting components include a spiral tube, a second screw threaded into the spiral tube, a connecting plate disposed at the end of the second screw, and a plurality of elastic telescopic rods fixed on the connecting plate. The outer walls of both the first and second spherical tubes are provided with limiting holes that cooperate with the elastic telescopic rods.

[0011] Preferably, a central connecting plate is fixed on the second spherical shell, and a rotating tube is rotatably connected to the central connecting plate. A first connecting rod and a second connecting rod are slidably connected to both ends of the rotating tube, respectively. A first connecting plate is fixed on the outer side of the first spherical shell, and a rotating rod is rotatably connected to the first connecting plate. Both the rotating rod and the rotating tube are provided with main bevel gears. The end of the threaded tube of the limiting assembly on the first and second spherical shells is provided with a secondary bevel gear that meshes with the main bevel gear.

[0012] Preferably, a connecting part for transmitting the torque of the rotating tube is provided between the rotating rod and the first connecting rod, and between the first screw and the second connecting rod. The connecting part includes two U-shaped plates and a cross shaft rotatably connected to the U-shaped plates.

[0013] A cable tray device includes the aforementioned fireproof buried cable tray connector, including a cable tray body that is connected to the end of a second tube, the end of the cable tray body being provided with a second socket that mates with a first socket, and the cable tray body being provided with a nano-ceramic coating, a cathodic protection electrode, and a copper-plated shielding layer. It also includes an intelligent monitoring module, which is installed on the connector or cable tray, for real-time monitoring of temperature and / or displacement parameters.

[0014] The present invention also discloses a method of using a cable tray device, comprising the following steps: S1: Pre-embedded positioning steps: The connecting shell is precisely positioned and fixed to the designed position of the floor slab template using a three-dimensional adjustable positioning frame, so that the positioning wing plate is tightly attached to the template; S2: Concrete pouring and sealing steps: Concrete is poured, and after the concrete has initially set, the three-level sealing system is constructed at the interface between the connecting shell and the concrete floor slab, including the injection of fireproof sealant. S3: Cable tray installation and adjustment steps: After the concrete reaches the design strength, connect the cable tray body on the upper side of the concrete floor slab and the cable tray body on the lower side of the concrete floor slab to the corresponding split connectors. S4: Monitoring Operation Steps: The intelligent monitoring module is activated to monitor the device's operating status in real time.

[0015] Compared with the prior art, the present invention provides a fireproof concealed cable tray connector, a cable tray device, and a method of using the same, which has the following beneficial effects: 1. In this invention, by adopting a composite fireproof structure of "galvanized steel plate + ceramicized silicone", the structure can maintain its integrity for ≥120 minutes under a high-temperature flame of 950℃. The fire resistance limit is more than 300% higher than that of traditional Q235 carbon steel components, far exceeding the requirements of national fire protection standards, providing valuable time for personnel evacuation and fire fighting. The innovative three-level sealing system (fireproof strip + fireproof sealant + mechanical clamping device) can effectively control the smoke infiltration rate to within 3m³ / (m·h), completely eliminating the "chimney effect". It ensures the connection accuracy and avoids loosening caused by long-term vibration, improving the overall reliability of the system and significantly slowing down the longitudinal spread of fire and toxic smoke along the cable tray. The expanded graphite sealing ring and adjustable mechanical clamping device ensure the continuous effectiveness of the sealing interface throughout the entire fire cycle (from ignition to high temperature and then to cooling), realizing a qualitative change from "passive sealing" to "active adaptation and continuous sealing", solving the core problem of insufficient fireproof sealing of traditional connectors.

[0016] 2. In this invention, the internal honeycomb-shaped spatial truss reinforcement design increases the overall stiffness of the connectors by 170% compared to traditional structures, with a compressive strength of 300kN. This effectively resists the lateral pressure (0.6MPa) generated by concrete pouring and vibration, as well as the long-term load caused by building settlement. The integrated composite cushion layer effectively absorbs energy under sudden loads such as earthquakes (e.g., simulating a rare earthquake with PGA=0.4g), protecting the main structure and cable safety, and minimizing disaster losses.

[0017] 3. In this invention, a composite anti-corrosion system is formed by combining a nano-ceramic coating (salt spray resistance ≥2000 hours) with hot-dip galvanizing and cathodic protection technology, which improves the product's weather resistance by 3 times and has a designed service life of up to 25 years. It is suitable for corrosive environments such as high humidity, coastal areas, and chemical industries. In addition, the copper-plated shielding layer on the inner wall of the cable tray can provide electromagnetic shielding effectiveness of ≥60dB, effectively ensuring the stability and safety of internal cable signal transmission and preventing external electromagnetic interference.

[0018] 4. In this invention, by using a split connector and combining it with BIM pre-assembly technology, the on-site construction error can be controlled within 3‰, the installation efficiency can be increased by 40%, and the construction time for a single node can be significantly reduced from 3 hours to 0.5 hours. The innovative pre-embedded positioning system (with toothed wing plate with ±0.5mm accuracy) and integrated design eliminate the need for secondary processing, simplify the installation process, and achieve one-time pre-embedding during the main construction, completely avoiding common quality problems such as incomplete sealing and leakage that are prone to occur in traditional secondary sealing processes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the connector of the present invention when connected to a cable tray; Figure 2 This is a schematic diagram of the connector of the present invention; Figure 3 This is a partial structural diagram of the connecting housing of the present invention; Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure; Figure 5 for Figure 4 Enlarged structural diagram of section A in the middle; Figure 6 for Figure 4 Enlarged structural diagram of section B; Figure 7 This is a schematic diagram of the overall structure of the split connector of the present invention; Figure 8 This is a schematic diagram of the separate structure of the split connector of the present invention; Figure 9 This is a schematic diagram of the external structure of the rotating tube of the present invention; Figure 10 This is a schematic diagram of the structure of the connecting part of the present invention; Figure 11 This is a schematic diagram of the structure of the connecting shell of the present invention embedded in a concrete floor slab.

[0020] In the diagram: 1. Concrete floor slab; 2. Connecting shell; 201. Outer shell; 202. Inner shell; 203. Honeycomb space truss reinforcing rib; 3. Positioning wing plate; 301. Anti-rotation toothed groove; 302. Annular boss; 4. Split connector; 401. First spherical shell; 402. First spherical tube; 403. Second spherical shell; 404. Second spherical tube; 405. Expanded graphite sealing ring; 5. Composite pad; 6. Three-stage sealing system; 601. First-stage seal; 602. Second-stage seal; 603. Third-stage seal; 7. ... 701. Connecting plate; 8. Rotating rod; 9. Second connecting plate; 10. First screw; 11. First sleeve; 12. U-shaped insert plate; 13. Middle connecting plate; 14. Rotating tube; 15. First connecting rod; 16. Second connecting rod; 17. First insertion hole; 18. Screw tube; 19. Second screw; 10. Connecting plate; 11. Elastic telescopic insert rod; 12. Limiting hole; 13. Main bevel gear; 14. Secondary bevel gear; 15. Connecting part; 16. U-shaped plate; 17. Cross shaft; 18. Cable tray body; 19. Second insertion hole. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 11 As shown, this embodiment proposes a fireproof concealed cable tray connector, including a connecting shell 2 pre-embedded in a concrete floor slab 1, and further including: positioning wing plates 3, split connectors 4, and composite pads 5; at least two positioning wing plates 3 are provided and symmetrically arranged on the outside of the connecting shell 2, and the surface of the positioning wing plates 3 is provided with anti-rotation teeth 301 and annular bosses 302, which effectively prevent the positioning wing plates 3 from separating from the poured concrete floor slab 1 and avoid easy displacement due to vibration after pouring; two split connectors 4 are provided and respectively arranged at the upper and lower ends of the connecting shell 2; the composite pads 5 cover the outer wall of the connecting shell 2 and are used to form an anti-seismic buffer interface between the connecting shell 2 and the concrete floor slab 1; It should be noted that the connecting shell 2 is made of 1.5mm galvanized steel plate and ceramicized silicone layer by hot pressing. The ceramicized silicone layer expands at 300℃ and above to form a honeycomb fire barrier. The connecting shell 2 includes an outer shell 201, an inner shell 202, and honeycomb spatial truss reinforcing ribs 203 set between the outer shell 201 and the inner shell 202. The honeycomb spatial truss reinforcing ribs 203 adopt a regular hexagonal honeycomb reinforcing rib array (single cell size 50×50mm). The longitudinal main ribs adopt 10# channel steel (wall thickness 2.5mm) and transverse secondary ribs (φ8 round steel) to form an orthogonal grid. The diagonal support ribs are arranged at 45° intersection (cross-sectional area ≥20mm²) to form a spatial truss system. The composite pad 5 is fixed to the outer shell 201 by dovetail groove embedded connection. The composite pad 5 includes a 2mm rubber layer, a +5mm aluminum silicate fiber layer, and a +1.5mm polyurethane damping layer arranged in sequence. The internal honeycomb-shaped space truss reinforcement 203 design increases the overall stiffness of the connector by 170% compared to the traditional structure, and the compressive strength reaches 300kN, which can effectively resist the lateral pressure (0.6MPa) generated by concrete pouring and vibration and the long-term load caused by building settlement. The integrated composite cushion layer 5 can effectively absorb energy under sudden loads such as earthquakes (e.g., a rare earthquake simulating PGA=0.4g), protecting the main structure and cable safety, and minimizing disaster losses. Furthermore, it also includes a three-stage sealing system 6, which includes: The first-level sealing element 601 is a ceramicized silicone rubber fireproof strip set on the outside of the composite pad 5 at the interface with the concrete floor slab 1, used for sealing when it expands due to heat. The second-level sealant 602 is a fireproof sealant injected into the opening of the connecting shell 2 and the surrounding concrete floor slab 1. The third-stage seal 603 is an adjustable mechanical compression sealing device integrated into the split connector 4; By adopting a composite fireproof structure of "galvanized steel plate + ceramicized silicone", the structure can maintain its integrity for ≥120 minutes under a high-temperature flame of 950℃. The fire resistance limit is more than 300% higher than that of traditional Q235 carbon steel components, far exceeding the requirements of national fire protection standards, providing valuable time for personnel evacuation and fire fighting. The innovative three-level sealing system (fireproof strip + fireproof sealant + mechanical pressing device) can effectively control the smoke infiltration rate to within 3m³ / (m·h), completely eliminating the "chimney effect" and significantly slowing down the longitudinal spread of fire and toxic smoke along the cable tray. The innovative pre-embedded positioning system (with toothed wing plate with ±0.5mm accuracy) and integrated design enable one-time pre-embedding during the main construction, completely avoiding common quality problems such as incomplete sealing and leakage that are prone to occur in traditional secondary sealing processes.

[0024] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 9 As shown, in a preferred embodiment, based on the above method, the split connector 4 further includes a first spherical shell 401 fixedly connected to the opening of the connecting housing 2, a first ball tube 402 rotatably connected inside the first spherical shell 401, a second spherical shell 403 movably connected to the end of the first ball tube 402 away from the first spherical shell 401, and a second ball tube 404 rotatably connected inside the second spherical shell 403. The first ball tube 402 and the second spherical shell 403 are keyway slidingly arranged, and the two can freely extend and retract to adapt to the distance between the connecting housing 2 and the cable tray. An expanded graphite sealing ring 405 is fixedly provided at the end of the second ball tube 404. Specifically, the first ball tube 402 can rotate freely relative to the first spherical shell 401, and the second ball tube 404 can rotate relative to the second spherical shell 403. When the position of the connecting shell 2 changes after the concrete floor slab 1 is poured or the cable tray installation position is deviated, the first ball tube 402 and the second ball tube 404 are controlled to swing, thereby aligning the opening at the end of the second ball tube 404 with the cable tray. Installation errors are allowed. When the second ball tube 404 is connected to the cable tray, the expanded graphite sealing ring 405 is squeezed. The expanded graphite sealing ring 405 deforms and fills the gap, ensuring the continuous effectiveness of the sealing interface throughout the entire fire cycle (from ignition to high temperature and then to cooling), realizing a qualitative change from "passive sealing" to "active adaptation and continuous sealing". By using the split connector 4 and combining it with BIM pre-assembly technology, the on-site construction error can be controlled within 3‰, the installation efficiency can be increased by 40%, and the construction time of a single node can be significantly reduced from 3 hours to 0.5 hours. It should be noted that the third-stage sealing element 603 includes a second connecting plate 8 fixed on the second ball shell 403, a first screw 801 rotatably connected to the second connecting plate 8, a first sleeve 802 threadedly connected to the first screw 801, and a U-shaped insert plate 803 fixedly connected to the first sleeve 802. The second ball tube 404 is provided with a first insertion hole 10 that cooperates with the U-shaped insert plate 803. Specifically, when it is necessary to connect the split connector 4 and the cable tray, the adjustable mechanical clamping and sealing device is activated. By rotating the first screw 801, the first sleeve 802 is displaced axially along the first screw 801. The first sleeve 802 drives the U-shaped insert plate 803 to insert into the contact surface between the second tube 404 and the cable tray, thereby locking the split connector 4 and the cable tray and preventing the cable tray from falling off.

[0025] like Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, in a preferred embodiment, based on the above method, a limiting component is further provided on both the first spherical shell 401 and the second spherical shell 403. The limiting component includes a screw tube 11, a second screw 111 threadedly connected to the screw tube 11, a connecting plate 112 provided at the end of the second screw 111, and a plurality of elastic telescopic inserts 113 fixed on the connecting plate 112. The screw tube 11 is rotatably provided on the outer wall of the spherical shell. The outer walls of the first spherical tube 402 and the second spherical tube 404 are provided with limiting holes 114 that cooperate with the elastic telescopic inserts 113. Specifically, when there is a deviation in the installation position between the connecting housing 2 and the cable tray, the positions of the first ball tube 402 and the second ball tube 404 are adjusted so that the open end of the second ball tube 404 is aligned with the cable tray. At this time, the position of the first ball tube 402 and the second ball tube 404 after rotation can be fixed by controlling the action of the limiting components on the first ball shell 401 and the second ball shell 403. By rotating the screw tube 11, the second screw 111, which is threaded to the inner wall of the screw tube 11, is axially displaced relative to the screw tube 11. The second screw 111 drives the elastic telescopic insert 113 to move closer to the outer wall of the ball tube through the connecting plate 112. At least two elastic telescopic inserts 113 on each connecting plate 112 are inserted into the limiting hole 114. The elastic telescopic inserts 113 that are not inserted into the limiting hole 114 will automatically retract, thereby fixing and limiting the ball tube inside the ball shell, preventing the first ball tube 402 and the second ball tube 404 from moving and affecting the stability of the cable tray installation.

[0026] like Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, in a preferred embodiment, based on the above method, a middle connecting plate 9 is fixedly provided on the second spherical shell 403, and a rotating tube 901 is rotatably connected to the middle connecting plate 9. The two ends of the rotating tube 901 are respectively slidably connected to the first connecting rod 902 and the second connecting rod 903. A first connecting plate 7 is fixedly provided on the outer side of the first spherical shell 401, and a rotating rod 701 is rotatably connected to the first connecting plate 7. Both the rotating rod 701 and the rotating tube 901 are provided with a main bevel gear 12. The end of the screw tube 11 of the limiting assembly on the first spherical shell 401 and the second spherical shell 403 is provided with a secondary bevel gear 121 that meshes with the main bevel gear 12. Furthermore, a connecting part 13 for transmitting the torque of the rotating tube 901 is provided between the rotating rod 701 and the first connecting rod 902, and between the first screw 801 and the second connecting rod 903. The connecting part 13 includes two U-shaped plates 131 and a cross shaft 132 rotatably connected to the U-shaped plates 131. Specifically, when the first tube 402 and the second tube 404 move within their respective shells, The first screw 801 moves with the second ball tube 404 and automatically deflects with the second connecting rod 903 through the connecting part 13. The second connecting rod 903 automatically extends and retracts relative to the rotating tube 903. The rotating tube 901 moves with the second spherical shell 403 connected to the first ball tube 402, and automatically deflects between the first connecting rods 902 via the connecting part 13. The first connecting rods 902 automatically extend and retract relative to the rotating tube 901. When the adjustable mechanical clamping sealing device is in operation, the rotating tube 901 is rotated. A handle can be provided on the outside of the rotating tube 901 to facilitate the operator's rotation. When the rotating tube 901 rotates, it drives the first connecting rod 902 and the second connecting rod 901, which are slidably connected to its keyway, to rotate. When the first connecting rod 902 rotates, it drives the rotating rod 701 to rotate through the connecting part 13. The main bevel gear 12 on the rotating rod 701 meshes with the secondary bevel gear 121 at the end of the solenoid 11 on the first spherical shell 401, so that the limiting component inside the first spherical shell 401 works and fixes the position of the first spherical tube 402 at this time. When the second connecting rod 903 rotates, it drives the first screw 801 to rotate through the connecting part 13. The main bevel gear 12 on the first screw 801 meshes with the secondary bevel gear 121 at the end of the screw tube 11 on the second spherical shell 403, so that the limiting component inside the second spherical shell 403 works and fixes the position of the second spherical tube 404 at this time. By preventing the first tube 402 and the second tube 404 from moving freely, the stability of the cable tray installation is ensured. By operating the rotating tube 901 in a single step, the synchronous drive limit component (locking the tube angle) and the U-shaped insert plate 803 are locked, achieving integrated coordination of "adjustment-locking-sealing". This not only reduces multiple operation steps, but also fundamentally avoids systemic risks such as loose connections or poor sealing caused by human error. Furthermore, the bevel gear transmission pair (main bevel gear 12 / secondary bevel gear 121) is a short-term transmission mechanism and a non-continuously moving part, resulting in minimal wear. The outer side of the connecting shell 2 is covered with a composite cushion layer 5, which is specially designed to form a seismic buffer interface with the concrete floor slab 1. This structure can effectively absorb and dissipate the vibration energy from the concrete floor slab 1, and minimize the vibration impact transmitted to the internal connecting shell 2 and linkage structure, thus avoiding instability of the linkage structure under vibration.

[0027] A cable tray device includes the aforementioned fireproof buried cable tray connector, comprising a cable tray body 14 that connects to the end of a second tube 404. The end of the cable tray body 14 is provided with a second insertion hole 141 that mates with a first insertion hole 10. A U-shaped insert plate 803 is inserted into the first insertion hole 10 and the second insertion hole 141 when the first sleeve 802 moves, thereby locking the connector and the cable tray body 14. The cable tray body 14 is provided with a nano-ceramic coating, a cathodic protection electrode, and a copper-plated shielding layer. By combining the nano-ceramic coating (80μm thick, salt spray resistance ≥2000 hours) with hot-dip galvanizing and cathodic protection technology, a composite anti-corrosion system is formed, improving the product's weather resistance by 3 times and extending its designed service life to 25 years. It is suitable for corrosive environments such as high humidity, coastal areas, and chemical industries. Furthermore, the copper-plated shielding layer on the inner wall of the cable tray provides ≥60dB of electromagnetic shielding effectiveness, effectively ensuring the stability and safety of internal cable signal transmission and preventing external electromagnetic interference. It also includes an intelligent monitoring module, which is installed on the connector or cable tray to monitor temperature and / or displacement parameters in real time. The intelligent detection module can be equipped with a fiber optic grating sensor (strain measurement accuracy ±1με), four sets of LVDT displacement gauges (range ±30mm, resolution 0.01mm), and upload the data to the back-end terminal via existing wireless transmission technology.

[0028] The present invention also discloses a method of using the aforementioned cable tray device, comprising the following steps: S1: Pre-embedded positioning steps: The connecting shell 2 is precisely positioned and fixed to the designed position of the floor slab template using a three-dimensional adjustable positioning frame, so that the positioning wing plate 3 is in close contact with the template; S2: Concrete pouring and sealing steps: Concrete is poured, and after the concrete has initially set, the three-level sealing system 6 is constructed at the interface between the connecting shell 2 and the concrete floor slab 1, including the injection of fireproof sealant. S3: Cable tray installation and adjustment steps: After the concrete reaches the design strength, the cable tray body 14 on the upper side of the concrete floor slab 1 and the cable tray body 14 on the lower side of the concrete floor slab 1 are respectively connected to the corresponding split connector 4. S4: Monitoring Operation Steps: The intelligent monitoring module is activated to monitor the device's operating status in real time.

[0029] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fireproof concealed cable tray connector, comprising a connecting housing (2) pre-embedded in a concrete floor slab (1), characterized in that, Also includes: Positioning wing plate (3), at least two of which are symmetrically arranged on the outside of the connecting housing (2), and the surface of the positioning wing plate (3) is provided with anti-rotation teeth (301) and annular boss (302). Split connector (4), there are two split connectors (4) and they are respectively located at the upper and lower ends of the connecting housing (2); And a composite cushion layer (5), which covers the outer wall of the connecting shell (2) and forms a seismic buffer interface with the concrete floor slab (1).

2. The fireproof concealed cable tray connector according to claim 1, characterized in that, The connecting shell (2) is made of galvanized steel plate and ceramicized silicone layer by hot pressing. The ceramicized silicone layer expands at a temperature of 300°C and above to form a honeycomb fire-resistant barrier. The connecting shell (2) includes an outer shell (201), an inner shell (202) and a honeycomb space truss reinforcing rib (203) disposed between the outer shell (201) and the inner shell (202). The composite pad (5) is fixed to the outer shell (201) by dovetail groove embedded connection. The composite pad (5) includes a rubber layer, an aluminum silicate fiber layer and a polyurethane damping layer disposed in sequence.

3. The fireproof concealed cable tray connector according to claim 2, characterized in that, It also includes a three-stage sealing system (6), which comprises: The first-level sealing element (601) is a ceramicized silicone rubber fireproof strip set on the interface between the composite pad (5) and the concrete floor slab (1) for sealing when heated; The second-level sealant (602) is a fireproof sealant injected into the openings of the connecting shell (2) and the surrounding concrete floor slab (1); The third-level seal (603) is an adjustable mechanical compression sealing device integrated into the split connector (4).

4. The fireproof concealed cable tray connector according to claim 3, characterized in that, The split connector (4) includes a first spherical shell (401) fixedly connected to the opening of the connecting housing (2), a first ball tube (402) rotatably connected inside the first spherical shell (401), a second spherical shell (403) movably connected to the end of the first ball tube (402) away from the first spherical shell (401), and a second ball tube (404) rotatably connected inside the second spherical shell (403). The first ball tube (402) and the second spherical shell (403) are slidably arranged with keyways, and an expanded graphite sealing ring (405) is fixedly provided at the end of the second ball tube (404).

5. The fireproof concealed cable tray connector according to claim 4, characterized in that, The third-stage seal (603) includes a second connecting plate (8) fixed on the second spherical shell (403), a first screw (801) rotatably connected to the second connecting plate (8), a first sleeve (802) threadedly connected to the first screw (801), and a U-shaped insert plate (803) fixedly connected to the first sleeve (802). The second spherical tube (404) is provided with a first insertion hole (10) that cooperates with the U-shaped insert plate (803).

6. The fireproof buried cable tray connector according to claim 5, characterized in that, Both the first spherical shell (401) and the second spherical shell (403) are provided with limiting components. The limiting components include a screw tube (11), a second screw (111) threaded into the screw tube (11), a connecting plate (112) provided at the end of the second screw (111), and a plurality of elastic telescopic inserts (113) fixed on the connecting plate (112). The outer walls of the first spherical tube (402) and the second spherical tube (404) are provided with limiting holes (114) that cooperate with the elastic telescopic inserts (113).

7. The fireproof concealed cable tray connector according to claim 6, characterized in that, A middle connecting plate (9) is fixed on the second spherical shell (403). A rotating tube (901) is rotatably connected to the middle connecting plate (9). A first connecting rod (902) and a second connecting rod (903) are slidably connected to both ends of the rotating tube (901). A first connecting plate (7) is fixed on the outer side of the first spherical shell (401). A rotating rod (701) is rotatably connected to the first connecting plate (7). A main bevel gear (12) is provided on both the rotating rod (701) and the rotating tube (901). A secondary bevel gear (121) that meshes with the main bevel gear (12) is provided at the end of the screw tube (11) of the limiting assembly on the first spherical shell (401) and the second spherical shell (403).

8. The fireproof buried cable tray connector according to claim 7, characterized in that, A connecting part (13) for transmitting the torque of the rotating tube (901) is provided between the rotating rod (701) and the first connecting rod (902) and between the first screw (801) and the second connecting rod (903). The connecting part (13) includes two U-shaped plates (131) and a cross shaft (132) rotatably connected to the U-shaped plates (131).

9. A cable tray device, comprising the fireproof concealed cable tray connector as described in claim 8, characterized in that, The cable tray body (14) is connected to the end of the second tube (404). The end of the cable tray body (14) is provided with a second socket (141) that mates with the first socket (10). The cable tray body (14) is provided with a nano-ceramic coating, a cathode protection electrode and a copper-plated shielding layer. It also includes an intelligent monitoring module, which is installed on the connector or cable tray, for real-time monitoring of temperature and / or displacement parameters.

10. A method of using the cable tray device as described in claim 9, characterized in that, Includes the following steps: S1: Pre-embedded positioning steps: The connecting shell (2) is precisely positioned and fixed to the design position of the floor slab template using a three-dimensional adjustable positioning frame, so that the positioning wing plate (3) is in close contact with the template; S2: Concrete pouring and sealing steps: Concrete is poured, and after the concrete has initially set, the three-level sealing system (6) is constructed at the interface between the connecting shell (2) and the concrete floor slab (1), including the injection of fireproof sealant. S3: Cable tray installation and adjustment steps: After the concrete reaches the design strength, the cable tray body (14) on the upper side of the concrete floor slab (1) and the cable tray body (14) on the lower side of the concrete floor slab (1) are respectively connected to the corresponding split connector (4). S4: Monitoring Operation Steps: The intelligent monitoring module is activated to monitor the device's operating status in real time.

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