A fire resistance testing device for fire-resistant cables

Abstract

This utility model relates to the field of cable testing technology, specifically a fire resistance testing device for fire-resistant cables. It includes a test platform with several lifting components fixedly mounted on it for adjusting the flame spray height. Each lifting component has a rotatable flame spray component mounted on it. A spring is installed between adjacent flame spray components. A gas supply pipe is connected to the rear end of each flame spray component. A fixing component is provided at the top of each lifting component. By setting up the lifting components, flame spray components, and fixing components, the lifting components drive the flame spray components and fixing components to move up and down synchronously, ensuring that each nozzle corresponds to a bent cable, guaranteeing uniform heating throughout the cable. This allows the test results to better reflect the cable's true fire resistance performance. Furthermore, when the cable shape needs to be changed, the cable shape can be altered by adjusting the height of each fixing component, eliminating the need to contact the cable or wait for it to cool down, thus improving testing safety and speed.

Description

Technical Field

[0001] This utility model relates to the field of cable testing technology, and in particular to a fire resistance testing device for fire-resistant cables. Background Technology

[0002] The fire resistance test of fire-resistant cables is an important standard to ensure that wires and cables can maintain stable operation and personnel safety in the event of a fire. The fire resistance test process usually involves exposing the wires and cables to specific temperature and flame conditions and observing their combustion performance, flame spread rate, smoke production and toxicity to determine their fire resistance rating.

[0003] The cable fire impact test device disclosed in Chinese patent CN212622433U uses a positioning mechanism to bend and position the cable onto a vertical positioning frame, enabling the cable to be bent and thus achieving a fire impact test on the bent cable, making the test results closer to the actual situation. However, according to the cable fire impact test device provided by related technologies and existing technologies, it uses a strip torch to heat the cable, and the flames are all at the same height. When the cable is bent, this heating method cannot make the cable heated evenly, affecting the test results. In addition, when the cable shape needs to be changed for retesting after one test, it is necessary to wait for the cable to cool down before the test can be carried out. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, solve the problems mentioned in the background art, and provide a fire resistance testing device for fire-resistant cables.

[0005] The purpose of this utility model is achieved through the following technical solution: a fire resistance testing device for fireproof cables, including a test platform, on which a plurality of lifting components for adjusting the height of the flame jet are fixedly installed, and flame jet components are rotatably mounted on each of the lifting components. A spring is installed between two adjacent flame jet components, and a gas supply pipe is connected to the rear end of each of the flame jet components. A fixing component is provided on the top of each of the lifting components, and a slag receiving tray is provided on the test platform below the fixing components.

[0006] Preferably, the lifting assembly includes a fixed sleeve fixed to the test platform, an extension rod slidably installed inside the fixed sleeve, a support frame fixedly provided on the top of the extension rod, and a locking bolt provided on the top of the fixed sleeve.

[0007] Preferably, the flame-throwing assembly includes a rotating sleeve rotatably mounted on the bottom of the support frame, a pulling plate fixedly provided at the front end of the rotating sleeve, an air inlet pipe connected to the air supply pipe fixedly provided inside the rotating sleeve, and a nozzle fixedly provided at the front end of the air inlet pipe.

[0008] Preferably, the fixing component includes a support rod fixed to the top of the support frame, a hanging clamp is fixedly provided at the rear end of the support rod, a pressure plate is slidably installed on the hanging clamp, and a clamping nut is installed on the hanging clamp at both ends of the pressure plate.

[0009] Preferably, the nozzle is flat, and two adjacent nozzles are in contact with each other with their contact surfaces being tangent arcs.

[0010] Preferably, the spring is fixedly connected to the pull plate, and the pull plate is parallel to the nozzle.

[0011] Preferably, the shape of the clamp is an inverted n-shape, and the relative position between the clamp and the nozzle is consistent with the relative position requirements specified for the cable and the nozzle during testing.

[0012] Beneficial effects:

[0013] This fire-resistant cable fire resistance testing device, by setting up a lifting component, a flame-spraying component, and a fixing component, allows the lifting component to drive the flame-spraying component and the fixing component to move up and down synchronously, so that each nozzle corresponds to the curved cable, ensuring that the cable is heated evenly throughout, ensuring a stable testing environment, and making the test results more reflective of the cable's true fire resistance performance. At the same time, when it is necessary to change the cable shape, the height of each fixing component can be adjusted by the lifting component to change the cable shape, without having to touch the cable or wait for it to cool down, thus improving the safety and speed of the test. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This utility model Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;

[0017] Figure 3 This utility model Figure 1 A magnified schematic diagram of the local structure at point B;

[0018] Figure 4 This is a schematic diagram of the lifting assembly of this utility model;

[0019] Figure 5This is a schematic diagram of the structure of the flamethrower assembly of this utility model;

[0020] Figure 6 This is a schematic diagram showing the positions of two adjacent flame-throwing components of this utility model;

[0021] Figure 7 This is a schematic diagram of the structure of the fixing component of this utility model.

[0022] In the diagram: 1. Test stand; 2. Lifting assembly; 201. Fixing sleeve; 202. Extension rod; 203. Locking bolt; 204. Support frame; 3. Flame-spraying assembly; 301. Rotating sleeve; 302. Pulling plate; 303. Air inlet pipe; 304. Nozzle; 4. Fixing assembly; 401. Support rod; 402. Hanging clamp; 403. Pressure plate; 404. Compression nut; 5. Spring; 6. Gas delivery pipe; 7. Slag receiving tray; 8. Cable. Detailed Implementation

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Additional aspects and advantages of this invention will be further set forth in the description which follows in conjunction with the accompanying drawings, in part of which will be obvious from the description or may be learned by practice of the invention.

[0025] like Figures 1 to 7As shown, a fire resistance testing device for fire-resistant cables includes a test platform 1. Five lifting components 2 for adjusting the flame height are fixedly mounted on the test platform 1. Each of the five lifting components 2 has a flame-spraying component 3 rotatably mounted on it. A spring 5 is installed between adjacent flame-spraying components 3. A gas supply pipe 6 is connected to the rear end of each of the five flame-spraying components 3. A fixing component 4 is located on the top of each of the five lifting components 2. A slag-receiving tray 7 is located below the five fixing components 4 on the test platform 1. In use, the cable 8 is first passed through the five fixing components 4 sequentially. Then, the middle fixing component 4 locks the cable 8, while the four fixing components 4 on both sides are slightly loosened, allowing the cable 8 to slide within the four fixing components 4 on both sides. The height of the five flame-spraying components 3 and the fixing components 4 are then adjusted by the lifting components 2, causing the five fixing components 4 to change the shape of the cable 8 to meet the testing requirements. At this time, due to the fixing components 4 and... The relative positions of the flame-spraying components 3 remain unchanged. Therefore, the relative positions of the five flame-spraying components 3 and the cable 8 are all fixed and identical, eliminating the need for subsequent positioning adjustments to the cable 8. During the height adjustment of the five flame-spraying components 3, the springs 5 ​​installed between two adjacent flame-spraying components 3 will pull the two adjacent flame-spraying components 3 to rotate towards each other, making the curve formed by the five flame-spraying components 3 more closely fit the curved cable 8, thereby ensuring the uniformity of heating throughout the cable 8. Finally, combustible gas is introduced into the flame-spraying components 3 through the gas supply pipe 6 and ignited to heat the cable 8 for a fire resistance test. The slag collection tray 7 below the cable 8 can collect the residue generated during the test. When the test is completed and the shape of the cable 8 needs to be changed for further testing, it is only necessary to readjust the height of the five fixed components 4 to change the bending shape of the cable 8, without waiting for the cable 8 to cool down, which facilitates subsequent testing.

[0026] like Figures 1 to 4 As shown, the lifting assembly 2 includes a fixed sleeve 201 fixed on the test bench 1. An extension rod 202 is slidably installed inside the fixed sleeve 201. A support frame 204 is fixedly provided on the top of the extension rod 202. A locking bolt 203 is provided on the top of the fixed sleeve 201. The extension rod 202 slides up and down along the inside of the fixed sleeve 201, thereby driving the support frame 204 to move up and down. The height of the support frame 204 is adjusted. After the adjustment is completed, the locking bolt 203 is rotated to fix the position of the extension rod 202, thereby fixing the height of the support frame 204.

[0027] like Figures 2 to 6As shown, the flame-spraying assembly 3 includes a rotating sleeve 301 rotatably mounted on the bottom of the support frame 204. A tension plate 302 is fixedly provided at the front end of the rotating sleeve 301. An air inlet pipe 303 connected to the air supply pipe 6 is fixedly provided inside the rotating sleeve 301. A nozzle 304 is fixedly provided at the front end of the air inlet pipe 303. The nozzle 304 is flat, and two adjacent nozzles 304 are in contact with each other, with their contact surfaces being tangent arc-shaped. A spring 5 is fixedly connected to the tension plate 302, and the tension plate 302 is parallel to the nozzle 304. The five nozzles 304 divide the flame-spraying area into five segments, and the nozzles 304 are driven by the support frame 204. The height of each nozzle 304 can be adjusted individually by moving it up and down to accommodate the bending of the cable 8, ensuring that all parts of the cable 8 are within the heating area of ​​the nozzle 304 in front of it. When adjusting the height of the nozzle 304, the two adjacent pull plates 302 will stretch the spring 5 between them, and the spring 5 will pull them to swing towards each other, so that they are as close to the same plane as possible. During this process, the pull plates 302 will drive the nozzle 304 to rotate through the rotating sleeve 301 and the air inlet pipe 303, causing the nozzle 304 to tilt and align with the cable 8 behind it, thereby ensuring the uniformity of heating of all parts of the cable 8.

[0028] like Figure 7 As shown, the fixing component 4 includes a support rod 401 fixed to the top of the support frame 204. A hanging clamp 402 is fixedly provided at the rear end of the support rod 401. A pressure plate 403 is slidably installed on the hanging clamp 402. A clamping nut 404 is installed at both ends of the pressure plate 403 on the hanging clamp 402. The hanging clamp 402 is in the shape of an inverted n. The relative position between the hanging clamp 402 and the nozzle 304 is consistent with the relative position requirement specified for the cable 8 and the nozzle 304 during the test. The cable 8 is passed through the bottom of the hanging clamp 402. Then, the clamping nut 404 is rotated to push the pressure plate 403 downward, clamping the cable 8. Thus, the cable 8 is fixed under the support of the support rod 401. Since the relative position between the hanging clamp 402 and the nozzle 304 is consistent with the relative position requirement specified for the cable 8 and the nozzle 304 during the test, there is no need to reposition the cable 8, which facilitates the fixing of the cable 8.

[0029] The work process is as follows:

[0030] S1: As Figures 1 to 3 As shown, the cable 8 passes through the bottom of the five clamps 402 one by one from under the pressure plate 403. Then, the clamping nuts 404 on the five clamps 402 are rotated respectively, so that the pressure plate 403 on the middle clamp 402 presses the cable 8 down and fixes the middle position of the cable 8. The pressure plates 403 on the four clamps on both sides only contact the cable 8 to limit it, so that the cable 8 can slide within the four clamps on both sides so that the cable can change shape later.

[0031] S2: As Figures 1 to 3 As shown, after the cable 8 is fixed, the extension rod 202 moves up and down along the inside of the fixing sleeve 201, thereby driving the support frame 204 to move up and down. The support frame 204 then drives the hanging clamp 402 to move up and down through the support rod 401, causing the hanging clamp 402 to bend at various points on the cable 8. After adjusting the positions of the five hanging clamps 402 in sequence, the shape of the cable 8 is made to meet the test requirements. Then, the locking bolt 203 is tightened to fix the position of the extension rod 202, thereby fixing the height of the support frame 204 and fixing the shape of the cable 8.

[0032] S3: As Figures 1 to 4 As shown, when the support frame 204 moves up and down, it will also drive the nozzle 304 to move synchronously through the rotating sleeve 301 and the air inlet pipe 303, so that the relative position between the nozzle 304 and the hanging clamp 402 remains unchanged, thereby ensuring that the relative position between the cable 8 and the nozzle 304 meets the test requirements, and there is no need to adjust the positioning of the cable 8.

[0033] S4: As Figures 1 to 4 As shown, when adjusting the height of each nozzle 304, the two adjacent pull plates 302 will stretch the spring 5 between them. The spring 5 will then pull the two to swing towards each other, so that the two are as close to the same plane as possible. During this process, the pull plates 302 will drive the nozzles 304 to rotate through the rotating sleeve 301 and the air inlet pipe 303, causing the nozzles 304 to tilt and correspond to the cable 8 behind them, thereby ensuring the uniformity of heating of the cable 8.

[0034] S5: As Figure 1 and Figure 2 As shown, combustible gas is supplied to the nozzle 304 through the gas supply pipe 6 and the air inlet pipe 303 and ignited, so that the flames sprayed out by the nozzle 304 heat the cable 8 and conduct a fire resistance test. The slag receiving tray 7 below the cable 8 can collect the residue generated during the test.

[0035] S6: As Figures 1 to 3 As shown, when the test is completed and the shape of the cable 8 needs to be changed for further testing, the height of the five clamps 402 can be readjusted to cause the cable 8 to change its bending shape without waiting for the cable 8 to cool down, which facilitates subsequent testing.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A fire resistance testing device for fire-resistant cables, characterized in that: The test platform (1) includes several lifting components (2) for adjusting the height of the flame jet. Each of the lifting components (2) is rotatably mounted with a flame jet component (3). A spring (5) is installed between two adjacent flame jet components (3). A gas supply pipe (6) is connected to the rear end of each of the flame jet components (3). A fixing component (4) is provided on the top of each of the lifting components (2). A slag receiving plate (7) is provided on the test platform (1) below the fixing components (4).

2. The fire resistance testing device for fire-resistant cables according to claim 1, characterized in that: The lifting assembly (2) includes a fixed sleeve (201) fixed on the test bench (1), an extension rod (202) is slidably installed inside the fixed sleeve (201), a support frame (204) is fixedly provided on the top of the extension rod (202), and a locking bolt (203) is provided on the top of the fixed sleeve (201).

3. The fire resistance testing device for fire-resistant cables according to claim 2, characterized in that: The flame-spraying assembly (3) includes a rotating sleeve (301) rotatably mounted on the bottom of the support frame (204). A pulling plate (302) is fixedly provided at the front end of the rotating sleeve (301). An air inlet pipe (303) communicating with the air supply pipe (6) is fixedly provided inside the rotating sleeve (301). A nozzle (304) is fixedly provided at the front end of the air inlet pipe (303).

4. The fire resistance testing device for fire-resistant cables according to claim 3, characterized in that: The fixing component (4) includes a support rod (401) fixed to the top of the support frame (204). A swivel clamp (402) is fixedly provided at the rear end of the support rod (401). A pressure plate (403) is slidably installed on the swivel clamp (402). A clamping nut (404) is installed on both ends of the pressure plate (403) on the swivel clamp (402).

5. The fire resistance testing device for fire-resistant cables according to claim 3, characterized in that: The nozzle (304) is flat, and two adjacent nozzles (304) are in contact with each other and the contact surfaces of the two are tangent arcs.

6. The fire resistance testing device for fire-resistant cables according to claim 3, characterized in that: The spring (5) is fixedly connected to the pull plate (302), and the pull plate (302) is parallel to the nozzle (304).

7. The fire resistance testing device for fire-resistant cables according to claim 4, characterized in that: The shape of the clamp (402) is an inverted n-shape, and the relative position between the clamp (402) and the nozzle (304) is consistent with the relative position requirements specified for the cable (8) and the nozzle (304) during the test.

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