Cable tensile testing device under bending conditions

Abstract

This utility model relates to a cable tensile testing device under bending conditions, comprising a base, a tension mechanism and a first cable end fixing mechanism disposed on the base, a vertical winding post disposed on the base, and an arc-shaped winding surface disposed on the side wall of the winding post; both ends of the cable can be connected to the tension mechanism and the first cable end fixing mechanism respectively, and the middle part of the cable is in contact with the winding surface. In use, this utility model allows the middle part of the cable under test to bend by passing it around the arc-shaped winding surface, thereby detecting the tensile strength of the cable under bending conditions. The testing conditions match actual working conditions, thus obtaining a more accurate tensile strength of the cable.

Description

Technical Field

[0001] This utility model belongs to the field of cable testing technology, and in particular to a cable tensile testing device under bending conditions. Background Technology

[0002] Tensile strength is an important indicator of cable performance and is typically tested using tensile testing devices, such as the cable tensile strength tester disclosed in CN202222544546.6 and the cable tensile strength testing device disclosed in CN202120100899.X. However, existing tensile tests are performed with the cable in a straight state. In practical applications, cables are often laid in a bent state, and traditional tensile tests cannot detect the tensile strength of cables under bending conditions. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a cable tensile testing device under bending conditions, which can detect the tensile strength of the cable after bending.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: a cable tensile testing device under bending state, including a base, a tension mechanism and a first cable end fixing mechanism are provided on the base, a vertical winding column is provided on the base, and an arc-shaped winding surface is provided on the side wall of the winding column; the two ends of the cable can be connected to the tension mechanism and the first cable end fixing mechanism respectively, and the middle part of the cable is in contact with the winding surface.

[0005] Furthermore, the cable end fixing mechanism is fixed on the base, and the base is provided with an arc-shaped slide rail, the center of which coincides with the center of the winding surface; a movable seat is provided on the slide rail and slides with the slide rail, and the tension mechanism is provided on the movable seat.

[0006] Furthermore, the slide rail is provided with a plurality of first locking screws.

[0007] Furthermore, the first cable end fixing mechanism includes a positioning block, the side wall of which is provided with a first through hole and a second through hole that are parallel to each other, the side of the positioning block away from the winding post is provided with an arc-shaped support surface, and the positioning block is provided with a plurality of second locking screws that are threadedly engaged with the positioning block, the second locking screws extending to the first through hole or the second through hole.

[0008] Furthermore, the tensioning mechanism is connected to a second cable end fixing mechanism.

[0009] Furthermore, the tension mechanism includes a hydraulic cylinder, which is connected to the second cable end fixing mechanism via a tension sensor.

[0010] The beneficial effects of this utility model are: when using this utility model, the middle part of the cable to be tested can be wrapped around the arc-shaped winding surface, so that the cable is bent, thereby detecting the tensile strength of the cable in the bending state. The detection conditions are consistent with the actual working conditions, thus obtaining the tensile strength of the cable more accurately. Attached Figure Description

[0011] Figure 1 This is a top view of Embodiment 1;

[0012] Figure 2 yes Figure 1 Schematic diagram of the cross section of AA;

[0013] Figure 3 yes Figure 2 Cross-sectional view of BB;

[0014] Figure 4 This is a top view of Embodiment 2;

[0015] Figure 5 yes Figure 4 Cross-sectional view of CC;

[0016] Reference numerals: 1—base; 2—winding post; 3—winding surface; 4—tension mechanism; 5—slide rail; 6—moving seat; 7—positioning block; 71—first through hole; 72—second through hole; 73—arc-shaped support surface; 74—second locking screw; 9—tension sensor; 10—first locking screw. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Example 1

[0019] The cable tensile testing device under bending conditions in this embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the device includes a base 1, which is made of a metal plate of a certain thickness, such as a 20mm thick stainless steel plate or cast iron plate. The base 1 is equipped with a tension mechanism 4 and a first cable end fixing mechanism. The tension mechanism 4 provides the tension required for the test, and the first cable end fixing mechanism fixes the end of the cable under test.

[0020] A vertical winding post 2 is mounted on the base 1. The side wall of the winding post 2 has an arc-shaped winding surface 3. When the cable runs along the circumference of the winding surface 3, the cable is in a bent state. The winding post 2 can be a circular cylinder, and the winding surface 3 is the entire circumference of the circular cylinder. Alternatively, the winding post 2 can be a cylinder with a semi-circular cross-section. The winding post 2 can be a solid cylinder, or a hollow cylinder can be used to reduce weight, as long as it has sufficient strength. The winding post 2 is made of metal, and its lower end can be welded to the base 1. As a preferred embodiment, a mounting plate is provided at the lower end of the winding post 2. The mounting plate is mounted to the base 1 by multiple bolts to facilitate the replacement of winding posts 2 of different sizes, thereby enabling tensile testing at multiple bending radii.

[0021] Both ends of the cable can be connected to the tension mechanism 4 and the first cable end fixing mechanism, respectively, and the middle of the cable is in contact with the winding surface 3. During testing, one end of the cable is fixed to the first cable end fixing mechanism, and the other end of the cable is wrapped around the winding surface 3 and fixed to the tension mechanism 4. The cable is kept horizontal, and the tension mechanism 4 applies tension to the cable. The tension is slowly increased until the tension value reaches the set value and is maintained for a period of time. This allows us to test whether the tensile strength of the cable meets the requirements. If the cable does not break under the set tension, it indicates that the tensile strength of the cable meets the requirements.

[0022] In this embodiment, in order to facilitate the connection of the cable to the tension mechanism 4, the tension mechanism 4 is connected to a second cable end fixing mechanism.

[0023] The second cable end fixing mechanism has the same structure as the first cable end fixing mechanism, both including a positioning block 7. The sidewall of the positioning block 7 has a first through hole 71 and a second through hole 72 that are parallel to each other. The side of the positioning block 7 away from the winding post 2 has an arc-shaped support surface 73. The positioning block 7 has multiple second locking screws 74 that are threaded into it, extending to either the first through hole 71 or the second through hole 72. Multiple second locking screws 74 are provided at both the first through hole 71 and the second through hole 72. When positioning the cable end, the cable end is passed through the first through hole 71, then around the arc-shaped support surface 73, then through the second through hole 72, and finally the multiple second locking screws 74 are rotated to press and fix the cable into the first through hole 71 and the second through hole 72. During the tensile test, the cable is subjected to a large tensile force. The above installation method can improve the stability of the cable end and prevent the cable end from falling off the second cable end fixing mechanism and the first cable end fixing mechanism.

[0024] In this embodiment, in order to accurately detect the tension borne by the cable, the tension mechanism 4 includes a hydraulic cylinder, which is connected to the second cable end fixing mechanism through the tension sensor 9.

[0025] In this embodiment, the tension mechanism 4 is fixed on the base 1, and the first cable end fixing mechanism is also fixed on the base 1.

[0026] Example 2

[0027] like Figure 4 and Figure 5 As shown, the cable tensile testing device under bending state in this embodiment includes a base 1, a tension mechanism 4 and a first cable end fixing mechanism are provided on the base 1, a vertical winding post 2 is provided on the base 1, and an arc-shaped winding surface 3 is provided on the side wall of the winding post 2. The two ends of the cable can be connected to the tension mechanism 4 and the first cable end fixing mechanism respectively, and the middle part of the cable is in contact with the winding surface 3.

[0028] In this embodiment, the structure of components such as the tension mechanism 4 and the first cable end fixing mechanism is the same as in Embodiment 1. The difference is that in this embodiment, the first cable end fixing mechanism is fixed to the base 1, for example, by welding or bolting. An arc-shaped slide rail 5 is provided on the base 1, with the center of the slide rail 5 coinciding with the center of the winding surface 3. A movable seat 6, which slides along the slide rail 5, is provided on the slide rail 5, and the tension mechanism 4 is mounted on the movable seat 6. The movable seat 6 can slide along the slide rail 5. When the movable seat 6 slides, it drives the tension mechanism 4 to move synchronously, thereby adjusting the angle of the tension mechanism 4 and changing the cable angle on both sides of the winding post 2 during testing. This allows for testing the tensile strength of the cable under different degrees of bending. For example, by adjusting the position of the movable seat 6, the cable angle g on both sides of the winding post 2 can be 90°, 120°, 60°, etc.

[0029] The movable seat 6 can be moved manually. When the movable seat 6 stops moving, in order to keep the movable seat 6 stable and prevent it from moving automatically, multiple first locking screws 10 are provided on the slide rail 5. The multiple first locking screws 10 are evenly distributed along the length of the slide rail 5. The small end of the first locking screw 10 can pass through the slide rail 5 and contact the movable seat 6. When the movable seat 6 moves into place, tighten the first locking screw 10, and the first locking screw 10 can press the movable seat 6 tightly.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any 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 cable tensile testing device in a bent state, comprising a base (1), a tension mechanism (4) and a first cable end fixing mechanism arranged on the base (1), characterized in that: The base (1) is provided with a vertical winding post (2), and the side wall of the winding post (2) is provided with an arc-shaped winding surface (3); the two ends of the cable can be connected to the tension mechanism (4) and the first cable end fixing mechanism respectively, and the middle part of the cable is in contact with the winding surface (3).

2. The flexed-in-place cable tension testing device of claim 1, wherein: The first cable end fixing mechanism is fixed on the base (1), and the base (1) is provided with an arc-shaped slide rail (5), the center of the slide rail (5) coincides with the center of the winding surface (3); the slide rail (5) is provided with a movable seat (6) that slides and cooperates with the slide rail (5), and the tension mechanism (4) is provided on the movable seat (6).

3. The flexed-in-situ cable tension testing device of claim 2, wherein: The slide rail (5) is provided with a plurality of first locking screws (10).

4. The flexed cable tension testing apparatus of claim 1 or 2, wherein: The first cable end fixing mechanism includes a positioning block (7). The side wall of the positioning block (7) is provided with a first through hole (71) and a second through hole (72) that are parallel to each other. The side of the positioning block (7) away from the winding post (2) is provided with an arc-shaped support surface (73). The positioning block (7) is provided with a plurality of second locking screws (74) that are threadedly engaged with the positioning block (7). The second locking screws (74) extend to the first through hole (71) or the second through hole (72).

5. The flexed cable tension testing apparatus of claim 1 or 2, wherein: The tension mechanism (4) is connected to a second cable end fixing mechanism.

6. The flexed-in-place cable tension testing device of claim 5, wherein: The tension mechanism (4) includes a hydraulic cylinder, which is connected to the second cable end fixing mechanism via a tension sensor (9).

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