Fire resistance testing device for fireproof cable

Abstract

The utility model discloses a fire resistance testing device for a fireproof cable, and relates to the technical field of wire and cable fire resistance detection. The clamping assembly is used for fixing a cable in the experiment box; the heating assembly is used for heating the cable, the heating assembly comprises at least one flame jet head, and the flame jet head forms a local heating surface on the outer surface of the cable in the pointing direction of the flame jet head; and the first driving part is used for driving the flame jet head to rotate along the cross section of the cable, so that the heating surface completely covers the outer surface of the cable. According to the utility model, the cable is fixed by arranging the clamping assembly, and when the flame jet head heats the outer surface of the cable, the first driving part drives the flame jet head to rotate along the cross section of the cable, so that the heating surface can completely cover the outer surface of the cable, and it is ensured that all parts of the cable are relatively uniformly heated; and the detection quality of the cable is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire resistance detection of wire and cable, in particular to a fire resistance test device for fireproof cable. Background Technique

[0002] During the production and research and development of fireproof cables, fire resistance tests are required. The test standard is to heat the cable to a specified temperature, continuously heat for a period of time, and observe the changes and final state of the cable during the heating process. A fire resistance test device is needed when conducting a fire resistance test on the cable.

[0003] After retrieval, it is found that the Chinese utility model patent with the authorization announcement number CN216646383U discloses a wire and cable fire resistance test device, which includes a combustion chamber and a fireproof cable to be tested suspended in the combustion chamber. There are torches arranged oppositely at the bottom of the fireproof cable to be tested. The torches are symmetrically distributed on the inner side wall of the combustion chamber. The torches are arranged obliquely below the fireproof cable to be tested, and the flame spraying direction faces the fireproof cable to be tested. During operation, since the torches are arranged on the side wall of the combustion chamber rather than directly below the fireproof cable to be tested, it can effectively prevent the dripping rubber from dripping into the torches and causing blockage and accidents. However, the applicant found deficiencies: when heating the cable with torches, the temperature at the position where the cable is too far from the torch is relatively low, and the temperature at the position where the cable is too close to the torch is relatively high, resulting in unqualified heating temperature and uneven heating of the cable, affecting the detection of the cable. Content of the Utility Model

[0004] The purpose of the utility model is to provide a fire resistance test device for fireproof cable to solve the technical problem of uneven heating of the cable during the heating process of the cable fire resistance test device in the current market proposed in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A fire resistance test device for fireproof cable, including:

[0006] An experimental box;

[0007] A clamping assembly for fixing the cable in the experimental box;

[0008] The experimental box is further provided with:

[0009] A heating assembly for heating the cable, the heating assembly includes at least one flame spraying head, and the flame spraying head forms a partial heating surface on the outer surface of the cable in its pointing direction;

[0010] A first driving component for driving the flame spraying head to rotate along the cross-section of the cable, so that the heating surface completely covers the outer surface of the cable.

[0011] As a preferred technical solution of the present utility model, the clamping assembly includes at least two clamping members oppositely arranged on the inner wall of the experimental box to clamp both ends of the cable.

[0012] As a preferred technical solution of the present utility model, the clamping member includes:

[0013] A clamp body provided with a fixed clamping plate, one end of the clamp body is fixedly arranged on the inner wall of the experimental box;

[0014] A movable clamping plate provided with a movable block, both the movable clamping plate and the fixed clamping plate are provided with clamping grooves for positioning the cable on the side where they are in contact, and the movable block is slidably matched with the movable groove opened in the clamp body;

[0015] A threaded rod rotatably arranged in the movable groove, the threaded rod is matched with the threaded groove opened on the surface of the movable block.

[0016] As a preferred technical solution of the present utility model, the experimental box is hinged with a box door, and an air inlet pipe and an exhaust pipe are arranged on one side of the experimental box.

[0017] As a preferred technical solution of the present utility model, the first driving member includes:

[0018] A frame provided with a rotating groove;

[0019] A rotating ring with balls on its surface, the balls are slidably matched with the rotating groove, and the flame spray head is arranged inside the rotating ring;

[0020] A second bevel gear arranged on one side of the rotating ring;

[0021] A first motor arranged on the outer side of the frame;

[0022] A first bevel gear connected to the output shaft of the first motor, the first bevel gear is meshed with the second bevel gear.

[0023] As a preferred technical solution of the present utility model, the flame spray head is inclinedly arranged inside the rotating ring, and there is an included angle between the flame spray head and the cable.

[0024] As a preferred technical solution of the present utility model, the heating assembly further includes: a gas tank arranged inside the rotating ring, and the gas tank is connected to the flame spray head.

[0025] As a preferred technical solution of the present utility model, the fire resistance testing device further includes: a second driving member for driving the rotating ring to move along the central axis of the cable.

[0026] As a preferred technical solution of the present utility model, the second driving member includes:

[0027] A plate body provided with a sliding groove;

[0028] A slider slidably disposed in the sliding groove;

[0029] An extension rod with one end connected to the slider, and the other end of the extension rod is connected to a frame;

[0030] A lead screw rotatably disposed in the sliding groove, and the lead screw is engaged with a lead screw groove formed in the slider;

[0031] A second motor disposed at one end of the plate body, and an output shaft of the second motor is connected to the lead screw.

[0032] As a preferred technical solution of the present utility model, the first motor is disposed on the surface of the extension rod, and a heat insulation cover for protecting the first motor is disposed outside the extension rod.

[0033] Compared with the prior art, the beneficial effects of the present utility model are:

[0034] The present utility model fixes the cable by setting a clamping assembly. When the flame spray head heats the outer surface of the cable, the first driving member drives the flame spray head to rotate along the cross-section of the cable, so that the heating surface can completely cover the outer surface of the cable, ensuring that each part of the cable is heated relatively evenly and improving the detection quality of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is an external three-dimensional structure schematic diagram of the present utility model;

[0036] Figure 2 It is a partially-sectioned three-dimensional structure schematic diagram of the experimental box of the present utility model;

[0037] Figure 3 It is a partially-sectioned three-dimensional structure schematic diagram of the frame of the present utility model;

[0038] Figure 4 It is a partially-sectioned three-dimensional structure schematic diagram of the fixture body of the present utility model.

[0039] In the figure: 1. Experimental box; 2. Intake pipe; 3. Exhaust pipe; 4. Box door; 5. Fixture body; 6. Fixed clamping plate; 7. Movable groove; 8. Movable clamping plate; 9. Clamping groove; 10. Movable block; 11. Threaded rod; 12. Threaded groove; 13. Cable; 14. Plate body; 15. Sliding groove; 16. Second motor; 17. Lead screw; 18. Slider; 19. Lead screw groove; 20. Extension rod; 21. Frame; 22. Rotating ring; 23. Ball; 24. Rotating groove; 25. Flame spray head; 26. Gas cylinder; 27. First motor; 28. First bevel gear; 29. Second bevel gear; 30. Heat insulation cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0041] Please refer to Figures 1-4 , the present utility model provides a technical solution: a fire-resistant test device for a fire-resistant cable, including: an experimental box 1; a clamping assembly for fixing the cable 13 in the experimental box 1; the experimental box 1 is further provided with: a heating assembly for heating the cable 13, the heating assembly includes at least one flame spray head 25, and the flame spray head 25 forms a local heating surface on the outer surface of the cable 13 in its pointing direction; a first driving component for driving the flame spray head 25 to rotate along the cross-section of the cable 13, so that the heating surface completely covers the outer surface of the cable 13.

[0042] Adopting the above technical solution can uniformly heat the cable 13. When in use, first use the clamping assembly to fix the cable 13, then start the flame spray head 25 to heat the outer surface of the cable 13, and then start the first driving component to drive the flame spray head 25 to rotate along the cross-section of the cable 13, so that the heating surface completely covers the outer surface of the cable 13, ensuring that all parts of the cable 13 are heated relatively evenly and improving the detection quality of the cable 13.

[0043] As Figure 2 shown, in this embodiment, the clamping assembly includes at least two clamping components oppositely arranged on the inner wall of the experimental box 1 to clamp both ends of the cable 13; specifically, the clamping component includes: a clamp body 5 provided with a fixed clamping plate 6, one end of the clamp body 5 is fixedly arranged on the inner wall of the experimental box 1; a movable clamping plate 8 provided with a movable block 10, both the movable clamping plate 8 and the fixed clamping plate 6 are provided with clamping grooves 9 for positioning the cable 13 on the side where they are in contact, and the movable block 10 is slidably matched with a movable groove 7 opened in the clamp body 5; a threaded rod 11 rotatably arranged in the movable groove 7, and the threaded rod 11 is matched with a threaded groove 12 opened on the surface of the movable block 10.

[0044] Adopting the above technical solution can clamp and fix the cable 13. When in use, first insert both ends of the cable 13 into the clamping grooves 9 between the movable clamping plate 8 and the fixed clamping plate 6, and then rotate the handle located at the outer end of the threaded rod 11, thereby driving the threaded rod 11 to rotate. The threaded rod 11 drives the movable block 10 to move in the movable groove 7, thereby driving the movable clamping plate 8 connected to the movable block 10 to approach the fixed clamping plate 6. The movable clamping plate 8 and the fixed clamping plate 6 approach each other to clamp and fix the cable 13, preventing the cable 13 from moving during the detection process.

[0045] As Figure 1 and Figure 2As shown in the figure, in this embodiment, the experimental box 1 is hinged with a box door 4, and an air inlet pipe 2 and an exhaust pipe 3 are arranged on one side of the experimental box 1;

[0046] Adopting the above technical solution can ensure the safety of the experiment. Since the heating temperature of the flame spray head 25 is relatively high, in order to prevent the flame from burning the experimenter, the box door 4 should be closed during the experiment, and observation can be carried out through the observation window on the surface of the box door 4. The air inlet pipe 2 is used to send oxygen into the interior of the experimental box 1 to prevent the flame spray head 25 from failing to work properly due to the exhaustion of oxygen in the experimental box 1. The exhaust pipe 3 is used to discharge the waste gas from the experimental box 1. In order to prevent the waste gas from polluting the environment, the exhaust pipe 3 can be connected to an air purification device.

[0047] As Figure 2 and Figure 3 As shown in the figure, in this embodiment, the first driving component includes: a frame 21 provided with a rotating groove 24; a rotating ring 22 with balls 23 arranged on its surface, the balls 23 are slidably matched with the rotating groove 24, and the flame spray head 25 is arranged inside the rotating ring 22; a second bevel gear 29 arranged on one side of the rotating ring 22; a first motor 27 arranged on the outside of the frame 21; a first bevel gear 28 connected to the output shaft of the first motor 27, and the first bevel gear 28 is meshed with the second bevel gear 29;

[0048] Adopting the above technical solution can uniformly heat the cable 13. During use, start the first motor 27 to drive the first bevel gear 28 to rotate. The first bevel gear 28 drives the second bevel gear 29 to rotate. The second bevel gear 29 drives the rotating ring 22 connected thereto to rotate synchronously. The rotating ring 22 drives the flame spray head 25 to rotate around the cable 13, thereby uniformly heating the cable 13.

[0049] As Figure 3 As shown in the figure, in this embodiment, the flame spray head 25 is inclinedly arranged inside the rotating ring 22, and there is an included angle between the flame spray head 25 and the cable 13; the heating component further includes: a gas tank 26 arranged inside the rotating ring 22, and the gas tank 26 is connected to the flame spray head 25;

[0050] Adopting the above technical solution can avoid the rubber on the surface of the cable 13 from melting and dripping into the spray port of the flame spray head 25 to cause blockage, and prevent the flame spray head 25 from extinguishing.

[0051] As Figure 2As shown in the figure, in this embodiment, the fire resistance test device further includes: a second driving component for driving the rotating ring 22 to move along the central axis of the cable 13; specifically, the second driving component includes: a plate body 14 provided with a chute 15; a slider 18 slidably disposed in the chute 15; an extension rod 20 having one end connected to the slider 18, and the other end of the extension rod 20 is connected to the frame 21; a lead screw 17 rotatably disposed in the chute 15, and the lead screw 17 is engaged with a lead screw groove 19 formed in the slider 18; a second motor 16 disposed at one end of the plate body 14, and an output shaft of the second motor 16 is connected to the lead screw 17;

[0052] With the above technical solution, heating experiments can be carried out on other positions of the cable 13. During operation, by starting the second motor 16 to drive the lead screw 17 to rotate, the lead screw 17 drives the slider 18 to slide along the chute 15, thereby driving the extension rod 20 and the frame 21 to slide synchronously. Since the chute 15 is parallel to the central axis of the cable 13, the flame spray head 25 inside the frame 21 can slide along the central axis of the cable 13 to heat other positions of the cable 13.

[0053] As Figure 3 shown in the figure, in this embodiment, the first motor 27 is disposed on the surface of the extension rod 20, and a heat insulation cover 30 for protecting the first motor 27 is disposed outside the extension rod 20;

[0054] With the above technical solution, the first motor 27 is protected. Since the flame temperature of the flame spray head 25 is relatively high, in order to avoid damaging the first motor 27, a heat insulation cover 30 is provided to isolate the first motor 27, thereby improving the service life of the first motor 27.

[0055] Working principle: When in use, first open the box door 4, insert both ends of the cable 13 into the clamping groove 9 between the movable clamping plate 8 and the fixed clamping plate 6 respectively, and then rotate the handle located at the outer end of the threaded rod 11, thereby driving the threaded rod 11 to rotate. The threaded rod 11 drives the movable block 10 to move in the movable groove 7, thereby driving the movable clamping plate 8 connected to the movable block 10 to approach the fixed clamping plate 6. The movable clamping plate 8 and the fixed clamping plate 6 approach each other to clamp and fix the cable 13, preventing the cable 13 from moving during the detection process. Then start the flame spray head 25 to heat the outer surface of the cable 13, and then start the first motor 27 to drive the first bevel gear 28 to rotate. The first bevel gear 28 drives the second bevel gear 29 to rotate. The second bevel gear 29 drives the rotating ring 22 connected thereto to rotate synchronously. The rotating ring 22 drives the flame spray head 25 to rotate around the cable 13, thereby uniformly heating the cable 13, so that the heating surface completely covers the outer surface of the cable 13, ensuring that all parts of the cable 13 are heated relatively evenly and improving the detection quality of the cable 13. The flame spray head 25 is inclined, which can prevent the rubber on the surface of the cable 13 from melting and dripping into the spray port of the flame spray head 25 to cause blockage and prevent the flame spray head 25 from going out. When it is necessary to conduct a heating experiment on other positions of the cable 13, start the second motor 16 to drive the screw rod 17 to rotate. The screw rod 17 drives the slider 18 to slide along the sliding groove 15, thereby driving the extension rod 20 and the frame 21 to slide synchronously. Since the sliding groove 15 is parallel to the central axis of the cable 13, the flame spray head 25 inside the frame 21 can slide along the central axis of the cable 13 to heat other positions of the cable 13.

[0056] Thus, a series of operations are completed. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0057] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A fire resistance test device for a fire resistant cable, comprising: Experiment box (1); A clamping assembly for fixing the cable (13) in the experimental box (1); Characterized in that the experimental box (1) is also provided with: A heating assembly for heating the cable (13), the heating assembly comprising at least one flame spray head (25), the flame spray head (25) forming a local heating surface on the outer surface of the cable (13) in the direction in which it is pointed; A first driving component is used to drive the flame spray head (25) to rotate along the cross section of the cable (13), so that the heating surface completely covers the outer surface of the cable (13).

2. The fire resistance testing device for fire-resistant cables according to claim 1, characterized in that: The clamping assembly comprises at least two clamping components arranged relatively on the inner wall of the test box (1) to clamp the two ends of the cable (13).

3. The fire resistance testing device for fire-resistant cables according to claim 2, characterized in that: The clamping member comprises: A clamp body (5) is provided with a fixed clamp plate (6), and one end of the clamp body (5) is fixedly arranged on the inner wall of the experimental box (1); A movable clamping plate (8) is provided with a movable block (10), and a clamping groove (9) for positioning the cable (13) is provided on the side where the movable clamping plate (8) and the fixed clamping plate (6) are in contact with each other, and the movable block (10) is slidably matched with the movable groove (7) provided in the clamp body (5); The threaded rod (11) disposed in the movable groove (7) is rotated, and the threaded rod (11) is matched with a threaded groove (12) provided on the surface of the movable block (10).

4. The fire resistance testing device for fire resistant cables according to claim 1, characterized in that: The experimental box (1) is hingedly connected to a box door (4), and an air intake pipe (2) and an exhaust pipe (3) are arranged on one side of the experimental box (1).

5. The fire resistance testing device for fire-resistant cables according to claim 1, characterized in that: The first driving component comprises: A frame (21) provided with a rotation groove (24); A rotating ring (22) is provided with a ball (23) on its surface, the ball (23) is slidably matched with a rotating groove (24), and the flame injection head (25) is arranged on the inner side of the rotating ring (22); a second bevel gear (29) disposed on one side of the rotating ring (22); a first motor (27) disposed outside the frame (21); A first bevel gear (28) is connected to the output shaft of the first motor (27), and the first bevel gear (28) is meshed with a second bevel gear (29).

6. The fire resistance test device for fire-resistant cables according to claim 5, characterized in that: The flame spray head (25) is arranged obliquely on the inner side of the rotating ring (22), and an angle exists between the flame spray head (25) and the cable (13).

7. The fire resistance testing device for fire-resistant cables according to claim 5 or 6, characterized in that: The heating component further comprises: a gas tank (26) arranged on the inner side of the rotating ring (22), and the gas tank (26) is connected to the flame spray head (25).

8. The fire resistance testing device for fire resistant cables according to claim 6, characterized in that: The fire resistance testing device further comprises: a second driving component for driving the rotating ring (22) to move along the central axis of the cable (13).

9. The fire resistance testing device for fire resistant cables according to claim 8, characterized in that: The second driving component comprises: A plate body (14) provided with a slide groove (15); A sliding block (18) slidably arranged in the sliding groove (15); An extension rod (20) having one end connected to the slider (18), and the other end of the extension rod (20) connected to the frame (21); Rotating a screw rod (17) disposed in the slide groove (15), wherein the screw rod (17) cooperates with a screw rod groove (19) disposed in the slide block (18); A second motor (16) is arranged at one end of the plate body (14), and an output shaft of the second motor (16) is connected to a screw rod (17).

10. The fire resistance testing device for fire resistant cables according to claim 9, characterized in that: The first motor (27) is arranged on the surface of the extension rod (20), and a heat insulation cover (30) for protecting the first motor (27) is arranged outside the extension rod (20).

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