Clamping mechanism for cable fire resistance test under fire hazard condition

Abstract

The utility model relates to the technical field of cable combustion performance testing, in particular to a clamping mechanism for a cable fire resistance test under a fire hazard condition, which comprises a base frame and a clamping arm which are arranged in a test box, the base frame is provided with two oppositely arranged mounting plates, the mounting plates are provided with conical barrel seats capable of penetrating through cable test pieces, and the conical barrel seats are provided with clamping arms. A sliding barrel is arranged on the conical barrel seat in a sliding mode, a plurality of adjusting grooves are annularly formed in the conical barrel seat, the movable blocks are arranged in the adjusting grooves respectively, and one end of each clamping arm is hinged to the corresponding movable block; the chuck is arranged at the other end of the clamping arm; the clamping part is used for driving the plurality of chucks to clamp a cable test piece, the plurality of chucks are driven by the clamping part to clamp the cable test piece, so that the surface of the cable test piece is clamped by the plurality of chucks with proper force, and after the chucks break away from clamping the surface of the cable test piece, the chucks are opened, so that quick and convenient cleaning treatment can be realized; and the clamping effect of the test cable in the next fire resistance test is prevented from being influenced.

Description

Technical Field

[0001] This utility model relates to the field of cable combustion performance testing technology, and in particular to a clamping mechanism for cable fire resistance testing under fire conditions. Background Technology

[0002] Cables are usually fixed in brackets, cable trays or walls during use. To simulate this fixed state, the cable specimen to be tested is often positioned in the test chamber during the test of the cable's combustion performance. This is to avoid the test conditions from not matching the actual situation due to the cable being freely suspended or moving, and to ensure the smooth progress of the test.

[0003] For example, Chinese patent application number CN 202223589310.0 discloses a fire-resistant cable combustion test device, including a combustion chamber, a vacuum pump, a base, and a chamber door. The combustion chamber has clamping seats symmetrically arranged on its left and right inner walls, and clamping arms are arranged on its upper and lower inner walls. A spring is installed inside the clamping arm, with one end connected to the clamping seat and the other end connected to a movable plate. This allows for vacuuming and fire extinguishing, reducing contamination inside the chamber. However, in actual testing, it was found that as the cable specimen continues to burn at high temperatures, molten material adheres to the clamping parts. The solidified impurities after cooling are difficult to clean in the tightly closed clamping area, affecting the clamping effect of the cable in subsequent fire-resistant tests. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a clamping mechanism for cable fire resistance testing under fire conditions, so as to solve the technical problem that in the prior art, molten material will adhere to the clamping part, and the impurities that solidify after cooling are not easy to clean in the tightly closed clamping part, which affects the clamping effect of the cable in the next fire resistance test.

[0005] To achieve the above objectives, this utility model provides a clamping mechanism for cable fire resistance testing under fire conditions, including a base frame and clamping arms disposed inside a test chamber. The base frame has two opposing mounting plates, and each mounting plate has a conical barrel seat through which a cable test piece can pass. A sliding cylinder is slidably disposed on the conical barrel seat, and several adjusting grooves are circumferentially formed on the conical barrel seat. The clamping mechanism further includes:

[0006] Movable blocks are respectively disposed in several of the adjustment slots, and one end of the clamping arm is hinged to the movable block;

[0007] A chuck is located at the other end of the clamping arm;

[0008] Clamping parts used to drive several of the clamps to clamp the cable test pieces.

[0009] Furthermore, the base frame is evenly distributed with a number of mounting holes, and the mounting plate is detachably disposed in the mounting holes.

[0010] Furthermore, the movable block is slidably positioned within the adjusting groove and is fixed by bolts.

[0011] Furthermore, the end of the cone-shaped seat is provided with an end cap to close the port of the adjustment groove.

[0012] Furthermore, the clamping part includes:

[0013] Guide rod provided on the cone-shaped barrel seat;

[0014] A push plate is slidably mounted on the guide rod, and the push plate is fixed to one end of the sliding cylinder. A spring is sleeved on the guide rod, one end of the spring abuts against the cone seat, and the other end of the spring abuts against the push plate.

[0015] Rotate the guide cylinder located at the other end of the sliding cylinder, and the clamping arm is slidably disposed inside the guide cylinder.

[0016] Furthermore, the clamp is detachably mounted on the clamping arm by screws, and the clamping end face of the clamp is provided with a groove that mates with the end face of the cable test piece.

[0017] Furthermore, when the push plate is not pushed towards the cone-shaped seat, several clamps are pressed against the end face of the cable test piece.

[0018] Furthermore, when the pusher plate is pushed towards the cone-shaped seat, several of the clamps disengage from the end face of the cable test piece.

[0019] The beneficial effects of this utility model are as follows: In use, the clamping part drives several clamps to clamp the cable test piece, so as to achieve the effect of clamping the surface of the cable test piece with appropriate force by several clamps. After the clamps are released from clamping the surface of the cable test piece, the clamps open, which can achieve quick and convenient cleaning and avoid affecting the clamping effect of the cable in the next fire resistance test. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the state of the cable test specimen being vertically clamped according to the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the conical barrel seat in this utility model;

[0023] Figure 3 This is a schematic diagram of the assembly of the clamping part and some structures in this utility model;

[0024] Figure 4 This is a schematic diagram of the assembly of the conical barrel seat and the sliding cylinder in this utility model;

[0025] Figure 5 This is a schematic diagram of the assembly of the clamping arm and the chuck in this utility model;

[0026] Figure 6 This is a schematic diagram of the cable test specimen being horizontally clamped according to the present invention.

[0027] The diagram is marked as follows:

[0028] 1. Base frame; 2. Clamping arm; 3. Mounting plate; 4. Cable test piece; 5. Conical barrel seat; 6. Sliding cylinder; 7. Adjustment groove; 8. Moving block; 9. Clamp; 10. End cap; 11. Guide rod; 12. Push plate; 13. Spring; 14. Guide cylinder; 15. Groove. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] The first aspect of this utility model provides a clamping mechanism for cable fire resistance testing under fire conditions, such as... Figure 1-6As shown, the device includes a base frame 1 and a clamping arm 2 located inside the test chamber. The base frame 1 has two opposing mounting plates 3. Each mounting plate 3 has a conical barrel seat 5 through which a cable test piece 4 can pass. A sliding cylinder 6 is slidably mounted on the conical barrel seat 5. Several adjusting grooves 7 are circumferentially formed on the conical barrel seat 5. The clamping mechanism also includes:

[0032] The movable blocks 8 are respectively set in several adjustment slots 7, and one end of the clamping arm 2 is hinged to the movable blocks 8;

[0033] A chuck 9 is located at the other end of the clamping arm 2;

[0034] The clamping part is used to drive several clamps 9 to clamp the cable test piece 4.

[0035] In this embodiment, during use, the two ends of the cable test piece 4 are passed through the upper and lower cone-shaped bases 5 respectively. According to the wire diameter of the cable test piece 4, the installation position of the moving block 8 on the adjusting groove 7 is adjusted to control the clamping angle of the clamping arm 2. Then, the clamping part drives several clamps 9 to clamp the cable test piece 4, so as to achieve the effect of clamping the surface of the cable test piece 4 with appropriate force by several clamps 9. After the clamps 9 are released from clamping the surface of the cable test piece 4, the clamps 9 open, which can achieve quick and convenient cleaning.

[0036] In this embodiment, as Figure 1 As shown, the base frame 1 has several mounting holes evenly distributed on it. The mounting plate 3 can be detachably installed in the mounting holes. During use, by adjusting the installation position of the mounting plate 3 in different mounting holes, the distance between the two mounting plates 3 can be controlled, thereby adapting to cable test pieces 4 of different lengths.

[0037] In this embodiment, as Figure 2 , Figure 3 As shown, the movable block 8 is limited and slidably disposed in the adjustment groove 7 and is positioned by bolts. The closer the movable block 8 is to the small diameter end of the cone barrel seat 5, the smaller the tilt angle of the clamping arm 2 on the sliding cylinder 6, and the smaller the clamping force on the side end of the cable test piece 4. Thus, it can effectively clamp cable test pieces 4 with different wire diameters.

[0038] In this embodiment, as Figure 3 As shown, the end of the cone-shaped barrel seat 5 is provided with an end cap 10 to close the port of the adjustment groove 7, which facilitates thorough cleaning of the adjustment groove 7 and replacement of the moving block 8.

[0039] In this embodiment, as Figure 3 As shown, the clamping part includes:

[0040] Guide rod 11 is provided on cone barrel seat 5;

[0041] A push plate 12 is slidably mounted on the guide rod 11. The push plate 12 is fixed to one end of the sliding cylinder 6. A spring 13 is sleeved on the guide rod 11. One end of the spring 13 abuts against the cone barrel seat 5, and the other end of the spring 13 abuts against the push plate 12.

[0042] Rotate the guide cylinder 14 located at the other end of the sliding cylinder 6. The clamping arm 2 is slidably located inside the guide cylinder 14 and pushes the push plate 12 towards the cone seat 5. This can drive the sliding cylinder 6 to move synchronously. Then, the guide cylinder 14 drives the clamping arm 2 to rotate at a certain angle to insert the cable test piece 4 to be tested. After the push plate 12 is released, the push plate 12 is reset under the elastic force of the spring 13, thereby automatically clamping the cable test piece 4. The same operation is performed on the other side of the cable test piece 4 to ensure that the cable test piece 4 can be firmly clamped.

[0043] In this embodiment, as Figure 3 , Figure 5 As shown, the clamp 9 is detachably mounted on the clamping arm 2 by screws. The clamping end face of the clamp 9 is provided with a groove 15. The groove 15 cooperates with the end face of the cable test piece 4. Multiple grooves 15 act on the end face of the cable test piece 4 at the same time, ensuring a straight clamping effect while avoiding excessive clamping and damage to the sheath of the cable test piece 4.

[0044] In this embodiment, as Figure 1 , Figure 3 As shown, when the push plate 12 is not pushed towards the cone seat 5, several clamps 9 are pressed against the end face of the cable test piece 4.

[0045] In this embodiment, when the push plate 12 is pushed towards the cone seat 5, several clamps 9 are disengaged from the end face of the cable test piece 4, and each clamp 9 is easy to clean when it is open.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention includes the claims being limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0047] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A clamping mechanism for a cable fire resistance test under fire conditions, comprising a base frame (1) and clamping arms (2) disposed inside a test chamber, wherein the base frame (1) is provided with two oppositely arranged mounting plates (3), characterized in that, The mounting plate (3) is provided with a cone-shaped seat (5) through which the cable test piece (4) can pass. A sliding cylinder (6) is slidably provided on the cone-shaped seat (5). Several adjusting grooves (7) are circumferentially opened on the cone-shaped seat (5). The clamping mechanism further includes: Movable blocks (8) are respectively provided in several adjustment slots (7), and one end of the clamping arm (2) is hinged to the movable block (8); A clamp (9) is provided at the other end of the clamping arm (2); Clamping part used to drive several of the clamps (9) to clamp the cable test piece (4).

2. The clamping mechanism for cable fire resistance testing under fire conditions according to claim 1, characterized in that, The base frame (1) has several mounting holes evenly distributed on it, and the mounting plate (3) is detachably disposed in the mounting holes.

3. The clamping mechanism for cable fire resistance testing under fire conditions according to claim 1, characterized in that, The movable block (8) is slidably positioned within the adjusting groove (7) and is fixed by bolts.

4. The clamping mechanism for cable fire resistance testing under fire conditions according to claim 1, characterized in that, The cone-shaped seat (5) is provided with an end cap (10) at its end to close the port of the adjustment groove (7).

5. The clamping mechanism for cable fire resistance testing under fire conditions according to claim 1, characterized in that, The clamping part includes: A guide rod (11) is provided on the cone-shaped barrel seat (5); A push plate (12) is slidably mounted on the guide rod (11). The push plate (12) is fixed to one end of the sliding cylinder (6). A spring (13) is sleeved on the guide rod (11). One end of the spring (13) abuts against the cone seat (5), and the other end of the spring (13) abuts against the push plate (12). Rotate the guide cylinder (14) located at the other end of the sliding cylinder (6), and the clamping arm (2) is slidably located inside the guide cylinder (14).

6. The clamping mechanism for cable fire resistance testing under fire conditions according to claim 1, characterized in that, The clamp (9) is detachably mounted on the clamping arm (2) by screws. The clamping end face of the clamp (9) is provided with a groove (15), which is matched with the end face of the cable test piece (4).

7. The clamping mechanism for cable fire resistance testing under fire conditions according to claim 5, characterized in that, When the push plate (12) is not pushed towards the cone seat (5), several clamps (9) are pressed against the end face of the cable test piece (4).

8. The clamping mechanism for cable fire resistance testing under fire conditions according to claim 5, characterized in that, When the push plate (12) is pushed towards the cone seat (5), several clamps (9) are disengaged from the end face of the cable test piece (4).

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