Test bar for anti-cracking winding test and cable anti-cracking winding test device thereof

Abstract

The utility model belongs to cable testing device technical field relates to a kind of anti-cracking winding test test bar, comprising: stick body;Transmission part, installation in the one end of the stick body;Convex blade edge, be equipped on the stick body;Fixed mechanism, assembly on the stick body of the convex blade edge both sides.A kind of cable anti-cracking winding test device, comprising: rack;Vertical frame, symmetrically installed in the both sides of the rack;Power mechanism, installation in one of the vertical frame outside;The test bar of preceding article;Load mechanism, connect on winding and fixed cable, exert load tension to cable.The utility model increases single-face convex blade edge on test bar, with more winding turns, increase the stress point stress intensity when cable winding adheres, transverse winding stress accumulation is more fully, real reflection cable material is under complex and harsh conditions Stress cracking resistance.

Description

Technical Field

[0001] This utility model belongs to the technical field of cable testing devices, and particularly relates to a test bar for anti-cracking winding test and its cable anti-cracking winding test device. Background Technology

[0002] Currently, the most common testing equipment for crack resistance of low-smoke halogen-free cable materials is based on the GB / T32129-2015 standard "Halogen-free Low-smoke Flame-retardant Cable Materials for Wires and Cables". A fixed-size sample is fixedly wound onto a cylindrical stainless steel rod using a crack resistance winding machine. The sample is wound evenly and tightly for 3-5 turns and then placed in an oven with adjustable temperature to test the crack resistance of the material at different test temperatures. This mainly simulates the crack resistance stress response of the material under high-temperature working conditions and winding stress conditions, and quantifies the crack resistance of the cable material.

[0003] Since the test device uses a smooth cylindrical rod as the winding attachment, although it can realize a certain winding stress scenario, considering that the actual cable structure is not a complete and regular cylindrical shape, the conductor and the sheath often need to be wrapped with steel strip and mica strip, which makes the actual stress point of the sheath material attachment surface more complicated. The existing smooth and regular device cannot effectively evaluate the crack resistance performance of the material under actual working conditions.

[0004] The main defects and shortcomings of existing technologies include:

[0005] 1. The existing test equipment has a smooth and regular cylindrical winding attachment device, which does not conform to the actual cable structure shape, and the stress scenario under the test conditions is relatively simple and singular.

[0006] 2. If the number of cable turns is too small, the transverse stress response of the cable winding will not be fully accumulated.

[0007] 3. The existing cable load assembly is complex and has poor stability. This is because the number of cable winding turns is too small, resulting in insufficient transverse stress in the cable winding. During the winding process, the load weights are easy to fall off, causing the test to be interrupted. Repeated occurrences of this result in low test efficiency.

[0008] To further improve the efficiency and effectiveness of the test, this application proposes a winding device for cable winding with greater lateral stress. It can perform high-strength testing and evaluation of the material's crack resistance performance based on common cracking phenomena caused by irregular inner surface shape or embedded wrapping material during actual cable use. Utility Model Content

[0009] In order to solve the problems in the related technologies, this application provides a test bar for anti-cracking winding test and a cable anti-cracking winding test device to solve the defects mentioned in the background technology.

[0010] To solve the above technical problems, the following technical solution is adopted:

[0011] This application provides a test bar for crack resistance winding test, comprising: a bar body; a transmission component installed at one end of the bar body; a protruding cutting edge disposed on the bar body; a fixing mechanism assembled on both sides of the protruding cutting edge; a cable wound around the bar body, and the protruding cutting edge increases the friction between the cable and the bar body, while the fixing mechanism presses tightly onto the bar body to ensure a firm connection between the cable and the bar body.

[0012] In a further embodiment, the protruding cutting edge is integrally manufactured with the rod body; the protruding cutting edge is a single-sided protruding cutting edge, and its thickness is 0.5mm, 0.8mm, or 1mm; the height of the protruding cutting edge is between 1 and 2mm.

[0013] In a further embodiment, the fixing mechanism includes: two sets of fixing holes on the rod body on both sides of the protruding cutting edge, each fixing hole having a thread on its inner wall; and a fixing plate, which is fixedly installed on the fixing holes by bolts.

[0014] In a further embodiment, the cross-section of the fixing plate is arc-shaped; the side of the fixing plate facing the rod is provided with multiple dot-shaped protrusions or multiple rows of serrated protrusions.

[0015] In a further embodiment, the transmission component is a transmission wheel mounted on one end of the rod.

[0016] This application also provides a cable crack resistance winding test device, comprising: a frame; vertical frames symmetrically installed on both sides of the frame; a power mechanism installed on the outside of one of the vertical frames; the aforementioned test bar, the two ends of which are respectively installed on the two vertical frames via bearing seats; the power mechanism being driven by the transmission component; and a load mechanism connected to the wound and fixed cable to apply a load tension to the cable.

[0017] In a further embodiment, the power mechanism is a rotary motor mounted on the outside of the vertical frame, and the rotary motor is connected to the transmission component via a transmission belt.

[0018] In a further embodiment, the load mechanism includes a load connecting rod and a load weight mounted on the lower part of the load connecting rod; the load connecting rod is connected to a cable.

[0019] Compared with existing technologies, the beneficial effects of this patented technology, which adopts the above technical solution, are as follows:

[0020] The test bar of this invention features a single-sided raised cutting edge, allowing for more winding turns and increasing the stress intensity at stress points when the cable is wound and attached. This results in more thorough accumulation of transverse winding stress, truly reflecting the cable material's resistance to stress cracking under complex and harsh conditions. At the same time, the dotted or serrated protrusions on the fixing plate increase the friction between the plate and the cable sample, ensuring the cable does not detach and the load connection is more secure, thus improving the accuracy and efficiency of the test. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0022] Figure 1 This is a schematic diagram of the structure of the test rod of this utility model.

[0023] Figure 2 This is a structural schematic diagram of the test rod and fixing mechanism of this utility model.

[0024] Figure 3 This is a structural schematic diagram of one embodiment of the fixed pressure plate of this utility model.

[0025] Figure 4 This is a schematic diagram of another embodiment of the fixed pressure plate of this utility model.

[0026] Figure 5 This is a schematic diagram of the cable crack resistance winding test device of this utility model.

[0027] In the diagram: 1. Drive wheel; 2. Rod body; 3. Fixing hole; 4. Raised cutting edge; 5. Bolt; 6. Fixing pressure plate; 7. Dot-shaped protrusion; 8. Serrated protrusion; 9. Frame; 10. Vertical frame; 11. Bearing seat; 12. Load weight; 13. Load connecting rod. Detailed Implementation

[0028] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0029] Example 1

[0030] like Figure 1-2As shown, the test bar for the crack resistance winding test includes a bar body 2, with a transmission wheel 1 installed at one end of the bar body 2 as a transmission component. One side of the bar body 2 has a raised cutting edge 4. The raised cutting edge 4 is integrally manufactured with the bar body 2. The raised cutting edge 4 is a single-sided raised cutting edge 4, and its thickness is available in 0.5mm, 0.8mm, and 1mm specifications. The height of the raised cutting edge 4 is between 1-2mm, with 1.5mm being the optimal choice.

[0031] The cable is wound on the rod 2. The cable strip and the single-sided raised cutting edge 4 increase the stress strength at the stress point when the cable is wound and attached, which truly reflects the material's ability to resist stress cracking under complex and harsh conditions.

[0032] The fixing mechanism is mounted on the rod 2 on both sides of the protruding cutting edge 4.

[0033] The cable is wound around the rod 2, and the friction between the cable and the rod 2 is increased by the protruding cutting edge 4. At the same time, the fixing mechanism presses the cable tightly around the rod 2 to ensure a firm connection between the cable and the rod 2.

[0034] The fixing mechanism includes two sets of fixing holes 3, which are formed on the rod body 2 on both sides of the protruding cutting edge 4. Each fixing hole 3 has threads on its inner wall. The fixing pressure plate 6 is fixedly installed on the fixing hole 3 by bolts 5.

[0035] like Figure 3 As shown, the cross-section of the fixing plate 6 is arc-shaped, and multiple dot-shaped protrusions 7 are provided on the side of the fixing plate 6 facing the rod 2. Figure 4 As shown, the cross-section of the fixing plate 6 is arc-shaped, and the side of the fixing plate 6 facing the rod 2 has multiple rows of serrated protrusions 8. The fixing plate 6 with dot-shaped protrusions 7 or serrated protrusions 8 increases the friction on the contact surface with the cable sample, ensuring that the cable does not fall off, the load connection is more secure, and the accuracy and efficiency of the test are improved.

[0036] Example 2

[0037] like Figure 5 As shown, a cable crack resistance winding test device includes a frame 9, on which two vertical frames 10 are symmetrically mounted. A power mechanism is installed on the outside of one of the vertical frames 10. The power mechanism is a rotary motor mounted on the outside of the vertical frame 10, and the rotary motor drives the transmission wheel 1 on the connecting rod 2 via a transmission belt.

[0038] In Example 1, the test bar is mounted on two vertical frames 10 at both ends via bearing seats 11.

[0039] A load mechanism, connected to the wound and secured cable, applies a load tension to the cable. The load mechanism includes a load connecting rod 13 and a load weight 12 mounted on the lower part of the load connecting rod 13; the load connecting rod 13 is connected to the cable.

[0040] One end of the cable sample is first wound around the protruding cutting edge of the test rod. The deformation of the protruding cutting edge simulates the effect of embedding a cable. Then, a fixing plate is pressed tightly onto the cable sample with bolts to ensure sufficient lateral stress. The rotating motor operates, driving the test roll to wind 3-5 turns. After that, the load weight is connected to the cable sample. Then, the entire experimental setup is sent into a drying device to simulate a high-temperature environment for crack resistance testing.

[0041] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art that are not covered by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

[0042] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. Test bars for crack resistance winding test, including: rod(2); A transmission component is installed at one end of the rod (2); The feature is that the test bar further includes: A protruding cutting edge (4) is provided on the rod body (2); A fixing mechanism is assembled on the rod (2) on both sides of the protruding cutting edge (4); The cable is wound around the rod (2), and the friction between the cable and the rod (2) is increased by the protruding cutting edge (4). At the same time, the fixing mechanism presses the cable wound around the rod (2) to ensure a firm connection between the cable and the rod (2).

2. The test bar for crack resistance winding test according to claim 1, characterized in that, The raised cutting edge (4) and the rod body (2) are manufactured as a single piece; the raised cutting edge (4) is a single-sided raised cutting edge (4), and its thickness is 0.5mm, 0.8mm and 1mm; the height of the raised cutting edge (4) is between 1-2mm.

3. The test bar for crack resistance winding test according to claim 1, characterized in that, The fixing mechanism includes: Two sets of fixing holes (3) are provided on the rod body (2) on both sides of the protruding cutting edge (4), and each fixing hole (3) has a thread on its inner wall; The fixing plate (6) is fixedly installed on the fixing hole (3) by bolts (5).

4. The test bar for crack resistance winding test according to claim 3, characterized in that, The cross-section of the fixing plate (6) is arc-shaped; the fixing plate (6) facing the rod (2) has a plurality of dot-shaped protrusions (7).

5. The test bar for crack resistance winding test according to claim 3, characterized in that, The aforementioned or multiple rows of serrated protrusions (8).

6. The test bar for crack resistance winding test according to claim 1, characterized in that, The transmission component is a transmission wheel (1) installed at one end of the rod (2).

7. Cable crack resistance winding test device, comprising: Rack (9); Vertical frames (10) are symmetrically installed on both sides of the frame (9); The device is characterized by further comprising: The power mechanism is installed on the outside of one of the vertical frames (10); The test bar according to any one of claims 1-6, wherein both ends of the test bar are respectively mounted on the two vertical frames (10) via bearing seats (11); the power mechanism is connected to the transmission component; The load mechanism is connected to the wound and secured cable to apply a load tension to the cable.

8. The cable crack resistance winding test device according to claim 7, characterized in that, The power mechanism is a rotary motor installed on the outside of the vertical frame (10), and the rotary motor is connected to the transmission component via a transmission belt.

9. The cable crack resistance winding test device according to claim 8, characterized in that, The load mechanism includes a load connecting rod (13) and a load weight (12) installed at the lower part of the load connecting rod (13); the load connecting rod (13) is connected to a cable.

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