A device for testing the fire resistance of a cable

Abstract

The utility model provides a kind of cable fire performance testing device, including base, gas stove is arranged on base, the both ends of base are provided with tension unit, and tension unit includes the mount of slidable installation on base, and multiple sets of clamping mechanisms are arranged in the side of mount, and the other side is provided with connecting rod, base is further provided with movable rack, and tension sensor is arranged between movable rack and connecting rod, driving assembly connected with movable rack is arranged on base, and movable rack is driven to slide in the direction of far from gas stove by driving assembly.The device can simulate the stress of cable under use condition, and then burn cable by gas stove, so as to simulate the situation that cable is heated by flame under use condition, avoid the change of physical properties of cable under high temperature to affect test data, and its test data is more real and reliable.

Description

Technical Field

[0001] This utility model relates to the field of cable testing technology, specifically to a cable fire resistance performance testing device. Background Technology

[0002] As a key load-bearing component in modern engineering structures, cables are widely used in large-scale infrastructure projects such as cable-stayed bridges, suspension bridges, arch bridges, large stadiums, and tall towers. Their reliability directly affects the safety and stability of the entire structure, giving them an irreplaceable and crucial role in engineering construction.

[0003] However, in real-world applications, cables face numerous potential risks, with fire being one of the most destructive. Cables are typically made of high-strength steel and other materials, whose mechanical properties change significantly under high temperatures, such as reduced strength and decreased elastic modulus. If a cable loses its load-bearing capacity due to high temperatures during a fire, it can trigger a severe structural collapse, causing not only enormous property damage but also potentially endangering lives.

[0004] To ensure the safety of cables in fire conditions, it is crucial to conduct scientific and accurate testing and evaluation of their fire resistance performance. Through testing, key information such as the fire resistance limit and mechanical property changes of cables under different fire scenarios can be obtained, providing important basis for the fire-resistant design of cables, material selection, and the development of fire emergency plans.

[0005] For example, Chinese utility model patent with publication number CN207528672U provides a cable fire resistance performance testing device. When using the device, the cable specimen is installed on a gas furnace, the gap between the gas furnace and the cable specimen is sealed with fireproof cotton, and then the gas furnace is ignited and heated to conduct a fire resistance performance test on the cable.

[0006] However, most existing cable fire resistance testing devices only test the fire resistance of cables by heating them at high temperatures. When cables are under tension and are burned, their physical properties, such as strength reduction and elastic modulus, will change. Existing devices cannot simulate the situation where cables are burned by flames in the actual use scenario, and the reliability and authenticity of their test data are reduced. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model proposes a cable fire resistance performance testing device. This addresses the problem that most existing cable fire resistance performance testing devices mentioned in the background only test the fire resistance of cables by heating them at high temperatures. However, when cables are under tension and subjected to burning, their physical properties, such as reduced strength and elastic modulus, change. Existing devices cannot simulate the situation where cables are burned by flames in actual use scenarios, resulting in a decrease in the reliability and authenticity of their test data.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a cable fire resistance performance testing device, comprising a base, a gas furnace mounted on the base, and tension units at both ends of the base, the tension unit comprising: The mounting bracket is slidably mounted on the base, with multiple clamping mechanisms on one side and a connecting rod on the other side; A movable frame is mounted on the base, and a tension sensor is installed between it and the connecting rod; and A drive assembly, disposed on the base and connected to the movable frame, drives the movable frame to slide away from the gas furnace.

[0009] In a preferred embodiment, the clamping mechanism includes: The clamping base is detachably connected to the mounting bracket; Two sets of clamping blocks are arranged opposite each other and are slidably disposed within the clamping seat. The ends of the clamping blocks are provided with anti-slip arc surfaces. Two sets of fastening bolts are provided, with their ends rotatably mounted on the clamping seat, and the two sets of fastening bolts are respectively screwed to the two sets of clamping blocks.

[0010] In a preferred embodiment, a plurality of lead screws are provided on one side of the mounting bracket, and a plurality of clamping seats are sleeved on the lead screws. A limit nut is screwed onto the lead screw, and the limit nut abuts against one of the clamping seats.

[0011] In a preferred embodiment, a positioning frame is provided on the base, and the connecting rod is slidably threaded through the positioning frame along its axis.

[0012] In a preferred embodiment, the drive assembly includes a threaded rod rotatably mounted on the base and screwed to the movable frame, and a rocker wheel is provided at the end of the threaded rod.

[0013] In a preferred embodiment, the base is further provided with a protective cover, the gas furnace is disposed inside the protective cover, the protective cover is provided with a heat insulation layer, and the protective cover is also provided with a groove for the cable to pass through.

[0014] Compared with the prior art, the present invention has the following beneficial effects: When in use, the cable can be installed on the base, and the two ends of the cable are clamped and fixed by the clamping mechanism in the two sets of tension units on the base. Then, the movable frame is controlled by the drive component to slide away from the gas furnace, which can stretch the two ends of the cable. The tension sensor can accurately determine the magnitude of the force on the cable, thereby simulating the force on the cable under use. Then, the cable can be burned by the gas furnace to simulate the situation of the cable being heated by the flame under use, thus avoiding the change of the physical properties of the cable under high temperature and affecting the test data. The test data is more realistic and reliable. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 A three-dimensional structural schematic diagram of a cable fire resistance performance testing device provided by this utility model; Figure 2 This is a cross-sectional view of a cable fire resistance performance testing device according to the present invention; Figure 3 This is a schematic diagram of the installation structure of the clamping seat in a cable fire resistance performance testing device of this utility model; Figure 4 This is a cross-sectional view of the clamping seat in a cable fire resistance performance testing device of this utility model; Figure label: 1. Base; 2. Protective cover; 3. Insulation layer; 4. Groove; 5. Gas furnace; 6. Mounting bracket; 7. Connecting rod; 8. Positioning bracket; 9. Tension sensor; 10. Movable bracket; 11. Threaded rod; 12. Rocker wheel; 13. Lead screw; 14. Limit nut; 15. Clamping seat; 16. Clamping block; 17. Anti-slip arc surface; 18. Fastening bolt. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above application content.

[0018] Example: like Figure 1 , 2As shown in Figure 4, this utility model provides a cable fire resistance performance testing device, including a base 1, a gas furnace 5 on the base 1, and tension units at both ends of the base 1. The tension unit includes a mounting frame 6 that is slidably mounted on the base 1. Multiple clamping mechanisms are provided on one side of the mounting frame 6. The clamping mechanism includes a clamping seat 15 that is detachably connected to the mounting frame 6. Two sets of slidably mounted clamping blocks 16 are arranged opposite each other in the clamping seat 15. The ends of the clamping blocks 16 are provided with anti-slip arc surfaces 17. Two sets of fastening bolts 18 are rotatably mounted on the clamping seat 15. The two sets of fastening bolts 18 are screwed to the two sets of clamping blocks 16 respectively.

[0019] When using the device, the cable is first installed. During installation, the cable is passed through the mounting frame 6 and multiple sets of clamping seats 15. Then, the fastening bolt 18 is rotated to drive the clamping block 16 to slide until the anti-slip arc surface 17 at the end of the clamping block 16 abuts against the cable. The cable is clamped by multiple sets of clamping blocks 16 to improve the clamping firmness and make the cable located above the gas furnace 5.

[0020] like Figure 1 , 3 As shown, in this embodiment, multiple sets of lead screws 13 are provided on one side of the mounting frame 6, and multiple sets of clamping seats 15 are all sleeved on the lead screws 13. Limiting nuts 14 are screwed onto the lead screws 13, and the limiting nuts 14 abut against one of the clamping seats 15. An appropriate number of clamping seats 15 can be selected for installation according to the roughness of the cable surface. During installation, the clamping seats 15 are sleeved on the multiple sets of lead screws 13, and the positions of the multiple sets of clamping seats 15 are fixed by the limiting nuts 14, so as to facilitate the adjustment of the clamping force and prevent the cable from falling off the clamping mechanism during subsequent tests.

[0021] like Figure 1 , 3 As shown, in this embodiment, a connecting rod 7 is provided on the other side of the mounting bracket 6, and a positioning bracket 8 is provided on the base 1. The connecting rod 7 is slidably mounted on the positioning bracket 8 along its axis. A movable bracket 10 is provided on the base 1, and a tension sensor 9 is provided between the movable bracket 10 and the connecting rod 7. A drive assembly connected to the movable bracket 10 is also provided on the base 1. The drive assembly drives the movable bracket 10 to slide away from the gas furnace 5. The drive assembly includes a threaded rod 11, which is rotatably mounted on the base 1 and screwed to the movable bracket 10. A rocker wheel 12 is provided at the end of the threaded rod 11.

[0022] After the cable is installed, the rocker wheel 12 can be rotated to drive the threaded rod 11 to rotate, which in turn drives the movable frame 10 to slide, applying a tension force in one direction to multiple clamping mechanisms. The arrangement of two clamping units can stretch both ends of the cable. The positioning frame 8 prevents the mounting frame 6 from rotating during the rotation of the threaded rod 11. The tension sensor 9 can be used to determine the magnitude of the force on the cable, thereby improving the accuracy of the test data.

[0023] like Figure 1 , 2 As shown, in this embodiment, a protective cover 2 is also provided on the base 1, and the gas furnace 5 is placed inside the protective cover 2. A heat insulation layer 3 is provided inside the protective cover 2, and a groove 4 for the cable to pass through is also provided on the protective cover 2. When installing the cable, the cable passes through the groove 4. The arrangement of the protective cover 2 and the heat insulation layer 3 can shield the heating area and improve the safety during the test.

[0024] The specific usage and beneficial effects of this utility model are as follows: When in use, the cable can be installed on the base 1, and the two ends of the cable can be clamped and fixed by the clamping mechanism in the two sets of tension units on the base 1. Then, the movable frame 10 is controlled by the drive component to slide away from the gas furnace 5, so that the two ends of the cable can be stretched. The tension sensor 9 can accurately determine the magnitude of the force on the cable, thereby simulating the force on the cable in use. Then, the cable can be burned by the gas furnace 5 to simulate the situation where the cable is heated by the flame in use, thus avoiding the change of the physical properties of the cable at high temperature and affecting the test data. The test data is more realistic and reliable.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above. Modifications or improvements can be made to this utility model, which is obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model fall within the scope of protection claimed by this utility model.

Claims

1. A test device for the fire resistance performance of cables, characterized in that, The base (1) includes a base on which a gas furnace (5) is mounted. Both ends of the base (1) are equipped with tension units, each tension unit comprising: Mounting bracket (6) is slidably mounted on the base (1), with multiple clamping mechanisms on one side and a connecting rod (7) on the other side. A movable frame (10) is mounted on the base (1), and a tension sensor (9) is provided between it and the connecting rod (7); and A drive assembly is disposed on the base (1) and connected to the movable frame (10) to drive the movable frame (10) to slide away from the gas furnace (5).

2. The cable fire resistance performance testing device according to claim 1, characterized in that, The clamping mechanism includes: The clamping base (15) is detachably connected to the mounting bracket (6); Two sets of clamping blocks (16) are arranged opposite each other and are slidably disposed within the clamping seat (15). The ends of the clamping blocks (16) are provided with anti-slip arc surfaces (17). Two sets of fastening bolts (18) are provided, with their ends rotatably mounted on the clamping seat (15), and the two sets of fastening bolts (18) are respectively screwed to the two sets of clamping blocks (16).

3. The cable fire resistance performance testing device according to claim 2, characterized in that: The mounting bracket (6) has multiple sets of lead screws (13) on one side, and multiple sets of clamping seats (15) are all sleeved on the lead screws (13). A limit nut (14) is screwed onto the lead screw (13), and the limit nut (14) abuts against one of the clamping seats (15).

4. The cable fire resistance performance testing device according to claim 1, characterized in that: A positioning frame (8) is provided on the base (1), and the connecting rod (7) is slidably passed through the positioning frame (8) along its axis.

5. The cable fire resistance performance testing device according to claim 1, characterized in that: The drive assembly includes a threaded rod (11), which is rotatably mounted on the base (1) and screwed to the movable frame (10). A rocker wheel (12) is provided at the end of the threaded rod (11).

6. The cable fire resistance performance testing device according to claim 1, characterized in that: The base (1) is also provided with a protective cover (2), the gas furnace (5) is located inside the protective cover (2), the protective cover (2) is provided with a heat insulation layer (3), and the protective cover (2) is also provided with a groove (4) for the cable to pass through.

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