Cable tray expansion joint

Abstract

The utility model belongs to cable technical field discloses a cable bridge stretches out and draws back joint, including first bridge section and second bridge section, be equipped with the expansion joint between first bridge section and second bridge section, the expansion joint includes the ball -hinge connecting assembly and elastic sealing corrugated subassembly connected with first bridge section and second bridge section, and the limiting anti -drop assembly of second bridge section end portion, the ball -hinge connecting assembly includes the connecting ball bowl of setting in first bridge section end portion outside, the utility model discloses through with ball -hinge connecting assembly, elastic sealing corrugated subassembly and limiting anti -drop assembly integration in expansion joint, realized the integration compensation of cable bridge axial, lateral, vertical and small angle twist multidimensional displacement, not only solved the problem that traditional expansion joint cannot cope with lateral shearing force, still provided excellent sealing, vibration isolation and protection performance, improved the security and service life of cable bridge under complex working condition.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a cable tray expansion joint. Background Technology

[0002] Cable trays are devices used to protect cables and are commonly used in large offices, industrial workshops, bridges, and public places. In use, multiple cable trays are connected in series to form a channel for cable routing. Multiple parallel cable trays can also be installed to classify and route cables according to different types, such as high-voltage and low-voltage cables. Cable tray installation standards explicitly require the installation of expansion joints. The purpose is that cable trays expand or contract with changes in ambient temperature (especially noticeable for metal cable trays). To prevent damage to the integrity of the trays due to excessive expansion or contraction forces, a clearance is provided at the joint of adjacent cable trays, and an expansion joint is installed at this clearance to bridge the two cable trays together.

[0003] During the installation and use of cable trays, changes in ambient temperature cause thermal expansion and contraction. Existing technologies, such as the expansion joints disclosed in patent application number CN202420686015.7, mostly employ a sliding pair structure with a movable lap plate and guide groove. While this type of structure can compensate for linear expansion and contraction along the length of the cable tray, it still has the following drawbacks: It has a single function and cannot compensate for lateral, vertical, and angular displacements caused by building settlement, installation errors, or equipment vibration. When such multidimensional displacements occur, traditional expansion joints not only fail to effectively absorb energy but also become stress concentration points, leading to cable tray deformation, damage to connectors, and even squeezing and pulling internal cables, threatening power supply safety. Furthermore, their open or semi-open lap structure has poor sealing, making it difficult to effectively prevent dust and moisture intrusion. Utility Model Content

[0004] To overcome the technical defects of the existing technology, this utility model provides a cable tray expansion joint.

[0005] The technical solution adopted by this utility model is: a cable tray expansion joint, including a first cable tray section and a second cable tray section, an expansion joint is provided between the first cable tray section and the second cable tray section, the expansion joint includes a ball joint connection assembly and an elastic sealing corrugated assembly connected to the first cable tray section and the second cable tray section, and a limiting and anti-detachment assembly provided at the end of the second cable tray section.

[0006] Preferably, the ball joint connection assembly includes a connecting ball cup disposed on the outer side of the end of the first cable tray section and a connecting ball head disposed on the outer side of the end of the second cable tray section and matching the connecting ball cup, wherein the connecting ball head and the connecting ball cup cooperate to form a ball joint pair.

[0007] Preferably, the elastic sealing corrugated assembly includes a corrugated connecting pipe that is connected to one end of the first cable tray section and one end of the second cable tray section and is in the shape of a cylinder.

[0008] Preferably, both ends of the corrugated connecting pipe are fixedly connected to the outer walls of the first cable tray section and the second cable tray section respectively by fixing rings and fasteners.

[0009] Preferably, the fixing ring is an open ring, and the fastener includes two fixing plates located at the opening of the fixing ring, and the two fixing plates are fixedly connected by bolts and nuts.

[0010] Preferably, the limiting and anti-detachment component includes a limiting retaining ring fixedly installed at the end of the second bridge section.

[0011] Preferably, the limiting retaining ring is fixed to the end of the second cable tray section by screws.

[0012] Preferably, the material of the corrugated connecting pipe is a polymer elastomer.

[0013] The beneficial effects of this utility model are:

[0014] 1. By integrating the ball joint connection assembly, the elastic sealing corrugated assembly, and the limiting and anti-detachment assembly into the expansion joint, integrated compensation for the axial, lateral, vertical, and small-angle torsional multi-dimensional displacement of the cable tray is achieved. This not only solves the problem that traditional expansion joints cannot cope with lateral shear forces, but also provides excellent sealing, vibration isolation, and protection performance, improving the safety and service life of the cable tray under complex working conditions.

[0015] 2. By using the connection ball joint and the connection ball cup together, a universal joint structure is formed, which realizes unrestrained multi-directional rotation, fundamentally absorbing the misalignment and deflection between the cable trays, and solving the problems of easy jamming and rapid wear of traditional sliding pairs;

[0016] 3. By using fixing rings and fasteners to firmly seal and fix both ends, the sealing reliability is ensured throughout the entire compensation movement process, achieving a reliable seal in the entire circumference without dead angles, effectively isolating external dust and moisture. The flexible nature of the corrugated connecting pipe also brings excellent vibration isolation and noise reduction effects, protecting the internal cables. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1This is a schematic diagram of a cable tray expansion joint structure according to the present invention;

[0019] Figure 2 This is a cross-sectional view of a cable tray expansion joint structure according to the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1. First cable tray section; 2. Second cable tray section; 3. Expansion joint; 4. Ball joint assembly; 5. Elastic sealing corrugated assembly; 6. Limiting and anti-detachment assembly; 7. Connecting ball cup; 8. Connecting ball head; 9. Corrugated connecting pipe; 10. Fixing ring; 11. Fastener; 12. Fixing plate; 13. Bolt and nut; 14. Limiting retaining ring; 15. Screw. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0022] like Figure 1 and Figure 2 As shown, this embodiment provides a cable tray expansion joint, including a first cable tray section 1 and a second cable tray section 2. An expansion joint 3 is provided between the first cable tray section 1 and the second cable tray section 2. The expansion joint 3 includes a ball joint connection assembly 4 and an elastic sealing corrugated assembly 5 connected to the first cable tray section 1 and the second cable tray section 2, and a limiting and anti-detachment assembly 6 provided at the end of the second cable tray section 2. The ball joint connection assembly 4 allows the first cable tray section 1 and the second cable tray section 2 to deflect relative to each other to compensate for lateral and vertical displacement. The elastic sealing corrugated assembly 5 can both bend with the deflection of the ball joint connection assembly 4 and be independently... Axial compression and tension are applied to compensate for thermal expansion and contraction, while simultaneously forming a fully enclosed protection. The anti-detachment limit component 6 prevents the ball joint connection component 4 from disengaging under extreme conditions, ensuring the integrity of the cable tray expansion joint. By integrating the ball joint connection component 4, the elastic sealing corrugated component 5, and the anti-detachment limit component 6 into the expansion joint 3, integrated compensation for multi-dimensional displacements of the cable tray in the axial, lateral, vertical, and small-angle torsional directions is achieved. This not only solves the problem that traditional expansion joints cannot cope with lateral shear forces, but also provides excellent sealing, vibration isolation, and protection performance, improving the safety and service life of the cable tray under complex working conditions.

[0023] The ball joint connection assembly 4 includes a connecting ball cup 7 located on the outer side of the end of the first cable tray section 1 and a connecting ball head 8 located on the outer side of the end of the second cable tray section 2 and matched with the connecting ball cup 7. The connecting ball head 8 can rotate freely within the connecting ball cup 7, converting harmful lateral shear force into rolling friction between the spherical surfaces, making the deflection movement of the cable tray smooth and easy. Through the cooperation of the connecting ball head 8 and the connecting ball cup 7, a universal joint structure is formed, realizing unrestrained multi-directional rotation, fundamentally absorbing the misalignment and deflection between cable trays, and solving the problems of easy jamming and rapid wear of traditional sliding pairs.

[0024] The elastic sealing corrugated assembly 5 includes a cylindrical corrugated connecting pipe 9 connected to one end of the first cable tray section 1 and one end of the second cable tray section 2. Both ends of the corrugated connecting pipe 9 are fixedly connected to the outer walls of the first cable tray section 1 and the second cable tray section 2 respectively by fixing rings 10 and fasteners 11. The corrugated structure of the corrugated connecting pipe 9 gives it good elasticity in the axial direction, allowing it to expand and contract freely. When the ball joint connecting assembly 4 deflects, the flexible wall of the corrugated connecting pipe 9 can bend accordingly without breaking. The fixing rings 10 and fasteners 11 firmly seal and fix its two ends, ensuring the sealing reliability throughout the entire compensation movement process. This achieves a reliable seal in the entire circumference without dead angles, effectively isolating external dust and moisture. The flexible nature of the corrugated connecting pipe 9 also brings excellent vibration isolation and noise reduction effects, protecting the internal cables.

[0025] The fixing ring 10 is an open ring, and the fastener 11 includes two fixing plates 12 located at the opening of the fixing ring 10. The two fixing plates 12 are fixedly connected by bolts and nuts 13. By tightening the bolts and nuts 13, the two fixing plates 12 are brought closer together, thereby tightening the open ring 10 and making its inner wall evenly press against the end of the corrugated connecting pipe 9 to achieve sealing and fixing. It can generate a uniform circumferential pressing force, avoid local stress concentration that could damage the corrugated pipe, and achieve a better sealing effect.

[0026] The limiting and anti-detachment component 6 includes a limiting retaining ring 14 fixedly installed at the end of the second cable tray section 2. The limiting retaining ring 14 is fixed to the end of the second cable tray section 2 by screws 15. When the cable tray is subjected to excessive axial tension or deflection to the design limit, the limiting retaining ring 14 will mechanically interfere with the end of the first cable tray section 1 or the connecting ball cup 7 to form a hard stop, preventing separation and preventing the connecting ball head 8 from coming out of the connecting ball cup 7, thereby improving the safety and reliability of the product.

[0027] The material of the corrugated connecting pipe 9 is polyurethane elastomer.

[0028] During operation, when changes in ambient temperature cause axial expansion and contraction of the first cable tray section 1 and the second cable tray section 2, the displacement is absorbed by the compression or tension of the elastic sealing corrugated assembly 5, i.e., the corrugated connecting pipe 9. When the first cable tray section 1 and the second cable tray section 2 experience lateral, vertical, or angular displacement due to building settlement, installation errors, or other reasons, the ball joint connecting assembly 4 begins to work, and the connecting ball head 8 rotates adaptively within the connecting ball cup 7, thereby eliminating lateral shear stress. Throughout the entire movement, the corrugated connecting pipe 9 always moves with the cable and remains sealed, protecting the internal cables. If the displacement reaches the design limit, the limit retaining ring 14 of the limit anti-detachment assembly 6 will function, forming a mechanical stop to ensure that the entire expansion joint will not fail or disintegrate due to overload.

[0029] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0030] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A cable tray expansion joint, comprising a first cable tray section (1) and a second cable tray section (2), wherein an expansion joint (3) is provided between the first cable tray section (1) and the second cable tray section (2), characterized in that: The telescopic connecting section (3) includes a ball joint connecting assembly (4) and an elastic sealing corrugated assembly (5) connected to the first bridge section (1) and the second bridge section (2), as well as a limiting anti-detachment assembly (6) provided at the end of the second bridge section (2).

2. The cable tray expansion joint according to claim 1, characterized in that: The ball joint assembly (4) includes a connecting ball cup (7) disposed on the outer side of the end of the first bridge section (1) and a connecting ball head (8) disposed on the outer side of the end of the second bridge section (2) and matched with the connecting ball cup (7).

3. The cable tray expansion joint according to claim 1, characterized in that: The elastic sealing corrugated assembly (5) includes a corrugated connecting pipe (9) that is connected to one end of the first cable tray section (1) and one end of the second cable tray section (2) and is in the shape of a cylinder.

4. A cable tray expansion joint according to claim 3, characterized in that: Both ends of the corrugated connecting pipe (9) are fixedly connected to the outer wall of the first cable tray section (1) and the outer wall of the second cable tray section (2) respectively by fixing rings (10) and fasteners (11).

5. A cable tray expansion joint according to claim 4, characterized in that: The fixing ring (10) is an open ring, and the fastener (11) includes two fixing plates (12) located at the opening of the fixing ring (10). The two fixing plates (12) are fixedly connected by bolts and nuts (13).

6. The cable tray expansion joint according to claim 1, characterized in that: The limiting and anti-detachment component (6) includes a limiting retaining ring (14) fixedly installed at the end of the second bridge section (2).

7. A cable tray expansion joint according to claim 6, characterized in that: The limiting retaining ring (14) is fixed to the end of the second bridge section (2) by screws (15).

8. A cable tray expansion joint according to claim 3, characterized in that: The material of the corrugated connecting pipe (9) is a polymer elastomer.

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