A test device and method for simulating railway signal cable sheath cracking

Abstract

The present invention relates to a test device and method for simulating cracking of railway signal cable sheaths. By providing a cam structure, a support cylinder, and a torque dial, the present invention quantitatively applies tension to the sheath, simulating the process in which thermal expansion of the steel belt and insulation layer within the sheath generates tension within the sheath, potentially leading to longitudinal cracking. Openings are provided at both ends of the cable sheath to simulate the situation in which the cable surface is easily scratched and subsequently cracks. An aging chamber is provided in which the sheath is rotated and heated, simulating the sheath's aging process. With a simple device and a limited number of steps, the present invention fully simulates the environmental conditions during on-site installation and actual use of railway signal cables, effectively testing the sheath's crack resistance.

Description

Technical Field

[0001] The invention relates to a test device and method for simulating cracking of a railway signal cable sheath, and belongs to the field of cable manufacturing. Background Art

[0002] Railway signal cables are crucial infrastructure for ensuring smooth signal transmission and safe train operation. They primarily provide instructions for train passage and shunting operations. The proper transmission of railway signals depends largely on the integrity and stability of the signal cables. Due to complex operating environments, the sheath of pulley signal cables can age and crack due to factors such as climate, bending tension, and dragging wear. Therefore, pre-installation inspections of cable quality are essential.

[0003] According to GB / T 2951.31, General Test Methods for Insulation and Sheathing Materials of Electrical and Optical Cables, the current crack resistance test method for railway signal cable sheathing materials is as follows: Three test strips, 127 mm long, 6.0 mm wide, and 3.0 mm thick, are placed on a 6.0 mm diameter metal rod. One end of the test strip is fixed with a clamp, and the other end is clamped with a strong clamp and a weight attached. The metal rod is rotated to tightly wrap the test strip around the rod for six turns. The other end is secured with a clamp under load, and the weight is removed. The wound test strips and test rod are placed in an oven preheated to the specified temperature for one hour. The test strips and test rod are then removed from the oven and cooled to room temperature. Visual inspection of the test strips indicates that there are no cracks.

[0004] The crack resistance test method for finished railway signal cable sheaths is as follows: the sheath is cut open with a blade and cut into three strips, each 127 mm long, 6.0 mm wide, and 3.0 mm thick. The strips are then fitted with a 6.0 mm diameter metal rod. One end of the strip is fixed with a clamp, and the other end is clamped with a strong clamp and a weight attached. The metal rod is rotated to tightly wrap the strip around the rod, completing six turns. The other end is then secured with a clamp under load, and the weight is removed. The wound strips and test rods are placed in an oven preheated to the specified temperature for one hour. The strips and test rods are then removed from the oven and cooled to room temperature. Visual inspection of the specimens indicates that no cracks are present.

[0005] Existing technologies only test the problem of transverse cracking of materials and products. However, in the actual laying process, the problem of longitudinal cracking of the sheath still exists. In addition, the test conditions of the existing test methods cannot well simulate the environmental conditions during the actual use of railway signal cables. Therefore, the current cable sheath anti-cracking test method cannot meet the actual verification requirements.

[0006] Therefore, it is necessary to invent a test method and device for simulating the cracking of the railway signal cable sheath to solve the above problems. Summary of the Invention

[0007] The object of the present invention is to provide a test device and method for simulating railway signal cable sheath cracking, which can effectively detect the anti-cracking performance of the sheath.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A test device for simulating cracking of a railway signal cable sheath, comprising:

[0010] The cam structure includes a coaxially arranged square shaft, a round shaft, and a waist-shaped bidirectional cam, wherein the round shaft has a first end and a second end opposite to the first end, the square shaft is axially connected to the first end of the round shaft, and the waist-shaped bidirectional cam is axially connected to the second end. The waist-shaped bidirectional cam is integrally formed by a central rectangular cam block and two circular arc cams of equal size and shape respectively arranged at both ends of the rectangular cam block, and the two circular arc cams are symmetrically arranged;

[0011] A supporting cylinder is disposed around the outer periphery of the waist-shaped bidirectional cam, comprising a first half-cylinder shell and a second half-cylinder shell separated from the first half-cylinder shell. The supporting cylinder comprises a test end and a feeding end opposite to the test end, wherein the test end wraps the waist-shaped bidirectional cam.

[0012] an elastic connecting component disposed in the supporting cylinder, comprising a first elastic connecting member disposed between the oval-shaped bidirectional cam and the first semi-cylindrical shell, and a second elastic connecting member disposed between the oval-shaped bidirectional cam and the second semi-cylindrical shell and opposite to the first elastic connecting member, the first elastic connecting member and the second elastic connecting member extending along the radial direction of the oval-shaped bidirectional cam and respectively abutting against the oval-shaped bidirectional cam, the first elastic connecting member connected to the first semi-cylindrical shell, and the second elastic connecting member connected to the second semi-cylindrical shell;

[0013] a torque dial, disposed on the supporting cylinder;

[0014] A locking structure comprising a locking hole provided at the test end and a locking member passing through the locking hole, wherein the locking member moves relative to the locking hole along the axis of the locking member to abut against or away from the oval-shaped bidirectional cam;

[0015] An aging box is arranged outside the supporting cylinder and wraps the supporting cylinder. Corresponding through holes are respectively provided on the opposite side walls of the aging box. Bearings that cooperate with the test end and the feeding end are respectively provided in the two through holes. The supporting cylinder is passed through the two through holes and is rotatably connected to the aging box through the bearings.

[0016] In which, when the locking piece moves away from the waist-shaped bidirectional cam, the cam structure rotates relative to the supporting cylinder, and the first half-cylinder shell and the second half-cylinder shell move away from or approach each other under the action of the cam structure and the elastic connection component. When the locking piece is pressed against the waist-shaped bidirectional cam, the cam structure and the supporting cylinder are connected into a whole, and the supporting cylinder rotates synchronously with the cam structure.

[0017] It is characterized in that the locking part is a locking bolt, and the inner wall of the locking hole is provided with an internal thread that cooperates with the locking bolt, so that the locking bolt can move relative to the locking hole along the axial direction of the locking bolt, and then abut against the waist-shaped bidirectional cam or move away from the waist-shaped bidirectional cam.

[0018] It is characterized in that the connection point between the first elastic connecting member and the first half-cylinder shell is located on the side center line of the first half-cylinder shell, and the connection point between the second elastic connecting member and the second half-cylinder shell is located on the side center line of the second half-cylinder shell.

[0019] It is characterized in that the first elastic connecting member and the second elastic connecting member are springs.

[0020] It is characterized in that an industrial camera is installed on the top of the aging box, and the industrial camera can be connected to a handheld terminal device such as a mobile phone.

[0021] It is characterized in that the test device also includes a motor detachably connected to the square shaft.

[0022] A test method for simulating cracking of a railway signal cable sheath comprises the following steps:

[0023] S1. Install the test device at the discharge port of the extrusion die, rotate the square shaft according to the outer diameter requirement, rotate the oval bidirectional cam relative to the support cylinder, adjust the diameter of the support cylinder, start the extruder, and form a complete sheath structure on the support cylinder;

[0024] S2. Rotate the square shaft to rotate the oval-shaped bidirectional cam, changing the diameter of the support cylinder to simulate the thermal expansion of the steel belt and the thermal insulation layer within the sheath, thereby generating tension within the sheath. With the aid of the torque dial, quantify the tension applied to the interior of the sheath, and move the locking member so that it abuts against the oval-shaped bidirectional cam.

[0025] S3. Use a utility knife to open both ends of the sheath, with the opening depth reaching the steel belt armor layer, to simulate the situation where the surface of the cable is easily scratched when being dragged in a complex high-temperature environment during on-site laying. Place the supporting cylinder wrapped with the sheath in the aging box, set the temperature of the aging box to 80°C, rotate the supporting cylinder by a square shaft, and age it for 1 hour to observe whether the sheath is cracked.

[0026] Furthermore, the tension applied to sheaths of different outer diameters and thicknesses is different. The tension applied to sheaths of different outer diameters and thicknesses is as follows: sheath outer diameter 0-10mm, sheath thickness 1.0mm, tension 3kg; sheath outer diameter 10-30mm, sheath thickness 1.8mm, tension 5kg; sheath outer diameter above 30mm, sheath thickness 2.8mm, tension 8kg.

[0027] Furthermore, the opening lengths corresponding to sheaths of different outer diameters and different lengths are different. The opening lengths corresponding to sheaths of different outer diameters and different lengths are: sheath outer diameter 0-10mm, test length 100mm, opening length 5mm; sheath outer diameter 10-20mm, test length 200mm, opening length 8mm; sheath outer diameter 20-40mm, test length 300mm, opening length 10mm; sheath outer diameter above 40mm, test length 400mm, opening length 15mm.

[0028] The beneficial effects of the present invention are:

[0029] The present invention provides a cam structure, a supporting cylinder, and a torque dial to quantitatively apply tension to the sheath, simulating a process in which the steel belt, the heat insulation layer, and other structures in the sheath expand due to heat, causing tension in the sheath and possibly leading to longitudinal cracking; openings are made at both ends of the cable sheath to simulate a situation in which the cable surface is easily scratched and cracked; an aging box is provided in which the sheath is rotated and heated to simulate the aging process of the sheath; the present invention fully simulates the on-site laying process of the railway signal cable and the environmental conditions during actual use with a simple device and fewer steps, and can effectively detect the anti-cracking performance of the sheath.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a schematic diagram of the overall structure of a test device according to a preferred embodiment of the present invention;

[0033] Figure 2 A schematic structural diagram of a test device from another angle according to a preferred embodiment of the present invention;

[0034] Figure 3 This is a structural diagram of an aging box shown in a preferred embodiment of the present invention.

[0035] in:

[0036] 1. Cam structure; 11. Square shaft; 12. Round shaft; 13. Osteoarthritic bidirectional cam; 2. Support cylinder; 21. First half-cylinder shell; 22. Second half-cylinder shell; 3. Elastic connection assembly; 31. First elastic connection member; 32. Second elastic connection member; 4. Torque dial; 5. Locking structure; 51. Locking member; 6. Aging box; 61. Through hole; 62. Bearing; 7. Sleeve. DETAILED DESCRIPTION

[0037] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] See also Figures 1 to 3 A test device for simulating railway signal cable sheath cracking, shown in a preferred embodiment of the present invention, is suitable for fully simulating the environmental conditions encountered during on-site installation and actual use of railway signal cables, effectively testing the sheath's crack resistance. The device comprises a cam structure 1, a support cylinder 2, an elastic connection assembly 3, a torque dial 4, a locking structure 5, and an aging chamber 6.

[0039] The cam structure 1 comprises a coaxially arranged square shaft 11, a circular shaft 12, and a circular bidirectional cam 13. The circular shaft 12 has a first end and a second end opposite the first end. The square shaft 11 is axially connected to the first end of the circular shaft 12, and the circular bidirectional cam 13 is axially connected to the second end. The circular bidirectional cam 13 is integrally formed from a central rectangular cam block and two equally sized and shaped circular arc-shaped cams positioned at either end of the rectangular cam block. The two circular arc-shaped cams are symmetrically arranged.

[0040] The support cylinder 2, which surrounds the oval-shaped bidirectional cam 13, comprises a first half-shell 21 and a second half-shell 22 spaced apart from the first half-shell 21. The support cylinder 2 includes a test end and a feeding end opposite the test end, which wraps around the oval-shaped bidirectional cam 13. The feeding end is detachably connected to the extrusion die outlet (not shown), forming a complete sheath 7 structure on the support cylinder 2.

[0041] The elastic connecting assembly 3 is disposed within the support cylinder 2 and includes a first elastic connecting member 31 disposed between the oval-shaped bidirectional cam 13 and the first semi-cylinder shell 21, and a second elastic connecting member 32 disposed between the oval-shaped bidirectional cam 13 and the second semi-cylinder shell 22 and opposite to the first elastic connecting member 31. The first elastic connecting member 31 and the second elastic connecting member 32 extend along the radial direction of the oval-shaped bidirectional cam 13 and respectively abut against the oval-shaped bidirectional cam 13. The first elastic connecting member 31 connects to the first semi-cylinder shell 21, and the second elastic connecting member 32 connects to the second semi-cylinder shell 22. Before the sleeve 7 is formed, the cam structure 1 can rotate relative to the support cylinder 2. Under the action of the cam structure 1 and the elastic connecting assembly 3, the first semi-cylinder shell 21 and the second semi-cylinder shell 22 move away from or closer to each other, thereby changing the diameter of the support cylinder 2 and forming sleeves 7 of different diameters. After the jacket 7 is formed, the cam structure 1 rotates relative to the support cylinder 2. The first and second half shells 21 and 22 move away from each other under the action of the cam structure 1 and the elastic connector 3. This applies tension to the jacket 7, simulating the process in which the steel belt and thermal insulation layer within the jacket 7 expand due to thermal expansion, generating tension within the jacket 7 and potentially causing longitudinal cracking. The connection point between the first elastic connector 31 and the first half shell 21 is located on the lateral midline of the first half shell 21, and the connection point between the second elastic connector 32 and the second half shell 22 is located on the lateral midline of the second half shell 22. This increases the range of variation in the diameter of the support cylinder 2, facilitating testing of jackets 7 with varying diameters.

[0042] In this embodiment, the first elastic connector 31 and the second elastic connector 32 are springs, which facilitate the adjustment of the tension applied to the sheath 7 and accurately adjust the tension of the sheath 7. In other embodiments, the first elastic connector 31 and the second elastic connector 32 may also be elastic sheets, etc., which are not specifically limited.

[0043] The torque dial 4 is arranged on the supporting cylinder 2 . The torque dial 4 cooperates with the cam structure 1 , the elastic connection assembly 3 and the supporting cylinder 2 to quantitatively control the tension of the sheath 7 .

[0044] The locking structure 5 includes a locking hole (not shown) provided at the test end and a locking member 51 inserted into the locking hole. The locking member 51 moves relative to the locking hole along the axis of the locking member 51 to abut against or away from the oval-shaped bidirectional cam 13. As described above, when the locking member 51 is away from the oval-shaped bidirectional cam 13, the cam structure 1 can rotate relative to the support cylinder 2, changing the diameter of the support cylinder 2 or providing tension to the sheath 7. When the locking member 51 abuts against the oval-shaped bidirectional cam 13, the cam structure 1 and the support cylinder 2 are connected as a whole, and the support cylinder 2 can rotate synchronously with the cam structure 1. In this embodiment, the locking member 51 is a locking bolt, and the inner wall of the locking hole has an internal thread that cooperates with the locking bolt, so that the locking bolt can move relative to the locking hole along the axis of the locking bolt, thereby abutting against or away from the oval-shaped bidirectional cam 13. In other embodiments, the locking structure 5 can also be an elastic sheet, etc., which is not limited here.

[0045] Aging chamber 6 is positioned outside and surrounds support cylinder 2. Opposite side walls of aging chamber 6 are provided with corresponding through-holes 61, each housing a bearing 62 for the test end and the loading end. Support cylinder 2 passes through these through-holes 61 and is rotatably connected to aging chamber 6 via bearings 62. Support cylinder 2, encased in sheath 7, rotates within high-temperature aging chamber 6, simulating the aging of sheath 7 over time.

[0046] An industrial camera is installed on the top of the aging box 6, which can be connected to a handheld terminal device such as a mobile phone. During the test, the mobile phone can be used to observe whether the sheath 7 is cracking in real time, avoiding the need to open the aging box 6 for observation, which would cause the temperature of the aging box 6 to drop.

[0047] The test device further comprises a motor (not shown) detachably connected to the square shaft 11 , which can drive the cam structure 1 and the supporting cylinder 2 to rotate at a constant speed, so that the jacket 7 is heated evenly throughout.

[0048] The test method for simulating cracking of the railway signal cable sheath 7 shown in the present invention comprises the following steps:

[0049] S1. Install a test device at the discharge port of the extrusion die, rotate the square shaft 11 according to the outer diameter requirements, so that the waist-shaped bidirectional cam 13 rotates relative to the support cylinder 2. The first half-cylinder shell 21 and the second half-cylinder shell 22 move away from or close to each other under the action of the cam structure 1 and the elastic connection component 3, and adjust the diameter of the support cylinder 2; start the extruder to form a complete sheath 7 structure on the support cylinder 2.

[0050] S2. Rotate the square shaft 11, causing the oval-shaped bidirectional cam 13 to rotate. The first and second half-cylinder shells 21 and 22 move away from each other under the action of the cam structure 1 and the elastic connection assembly 3, applying tension to the sheath 7. This simulates the thermal expansion of the steel belt and insulation layer within the sheath 7, generating tension within the sheath 7. The torque scale 4 quantifies the amount of tension applied within the sheath 7. The corresponding tensions for sheaths of varying outer diameters and thicknesses are: 0-10mm outer diameter, 1.0mm thickness, 3kg tension; 10-30mm outer diameter, 1.8mm thickness, 5kg tension; 30mm outer diameter, 2.8mm thickness, 8kg tension. In this embodiment, the sheath 7 has an outer diameter of 25mm, a thickness of 1.8mm, and a tension of 5kg. Tighten the locking bolt until it abuts against the oval-shaped bidirectional cam 13, connecting the cam structure 1 to the support cylinder 2 as a single unit.

[0051] S3. Use a utility knife to cut holes at both ends of the sheath 7, the opening depth reaching the steel armor layer, simulating the surface scratches that easily occur when the cable is dragged in a complex high-temperature environment during on-site installation. Sheaths of different outer diameters and lengths correspond to different opening lengths. The corresponding opening lengths for sheaths of different outer diameters and lengths are as follows: for a sheath outer diameter of 0-10mm, the test length is 100mm, and the opening length is 5mm; for a sheath outer diameter of 10-20mm, the test length is 200mm, and the opening length is 8mm; for a sheath outer diameter of 20-40mm, the test length is 300mm, and the opening length is 10mm; for a sheath outer diameter of 40mm or more, the test length is 400mm, and the opening length is 15mm. In this embodiment, the outer diameter of the sheath 7 is 25mm, the test length is 300mm, and the opening length is 10mm. The support cylinder 2, encased in the sheath 7, was placed in an aging chamber 6 set to 80°C. A motor-driven square shaft 11 rotated the support cylinder 2 for one hour, simulating the actual aging process of the sheath 7 during use. The sheath 7 was monitored in real time using a mobile phone to detect cracking. The sheath 7 in this embodiment showed no cracking during the aging process, demonstrating excellent crack resistance and meeting the requirements of actual use.

[0052] In summary, the present invention applies tension to the sheath quantitatively by setting a cam structure, a supporting cylinder, and a torque dial, simulating the process in which the steel belt and the insulation layer in the sheath expand due to heat, causing tension in the sheath and possibly leading to longitudinal cracking; openings are made at both ends of the cable sheath to simulate the situation in which the cable surface is easily scratched and then cracked; by setting up an aging box, the sheath is rotated and heated in the aging box to simulate the aging process of the sheath; with a simple device and fewer steps, the on-site laying process of the railway signal cable and the environmental conditions during actual use are fully simulated, and the anti-cracking performance of the sheath can be effectively detected.

[0053] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A test device for simulating cracking of railway signal cable sheath, characterized in that: include: The cam structure includes a coaxially arranged square shaft, a round shaft, and a waist-shaped bidirectional cam, wherein the round shaft has a first end and a second end opposite to the first end, the square shaft is axially connected to the first end of the round shaft, and the waist-shaped bidirectional cam is axially connected to the second end. The waist-shaped bidirectional cam is integrally formed by a central rectangular cam block and two circular arc cams of equal size and shape respectively arranged at both ends of the rectangular cam block, and the two circular arc cams are symmetrically arranged; A supporting cylinder is disposed around the outer periphery of the waist-shaped bidirectional cam, comprising a first half-cylinder shell and a second half-cylinder shell separated from the first half-cylinder shell. The supporting cylinder comprises a test end and a feeding end opposite to the test end, wherein the test end wraps the waist-shaped bidirectional cam. an elastic connecting component disposed in the supporting cylinder, comprising a first elastic connecting member disposed between the oval-shaped bidirectional cam and the first semi-cylindrical shell, and a second elastic connecting member disposed between the oval-shaped bidirectional cam and the second semi-cylindrical shell and opposite to the first elastic connecting member, the first elastic connecting member and the second elastic connecting member extending along the radial direction of the oval-shaped bidirectional cam and respectively abutting against the oval-shaped bidirectional cam, the first elastic connecting member connected to the first semi-cylindrical shell, and the second elastic connecting member connected to the second semi-cylindrical shell; a torque dial, disposed on the supporting cylinder; A locking structure comprising a locking hole provided at the test end and a locking member passing through the locking hole, wherein the locking member moves relative to the locking hole along the axis of the locking member to abut against or away from the oval-shaped bidirectional cam; An aging box is arranged outside the supporting cylinder and wraps the supporting cylinder. Corresponding through holes are respectively provided on the opposite side walls of the aging box. Bearings matching the test end and the feeding end are respectively provided in the two through holes. The supporting cylinder is inserted into the two through holes and is rotatably connected to the aging box through the bearings. In which, when the locking piece moves away from the waist-shaped bidirectional cam, the cam structure rotates relative to the supporting cylinder, and the first half-cylinder shell and the second half-cylinder shell move away from or approach each other under the action of the cam structure and the elastic connection component. When the locking piece is pressed against the waist-shaped bidirectional cam, the cam structure and the supporting cylinder are connected into a whole, and the supporting cylinder rotates synchronously with the cam structure.

2. The test device for simulating railway signal cable sheath cracking according to claim 1, characterized in that: The locking piece is a locking bolt, and the inner wall of the locking hole is provided with an internal thread that cooperates with the locking bolt, so that the locking bolt can move relative to the locking hole along the axial direction of the locking bolt, thereby abutting against the waist-shaped bidirectional cam or away from the waist-shaped bidirectional cam.

3. The test device for simulating railway signal cable sheath cracking according to claim 1, characterized in that: The connection point between the first elastic connecting member and the first half-cylinder shell is located on the side center line of the first half-cylinder shell, and the connection point between the second elastic connecting member and the second half-cylinder shell is located on the side center line of the second half-cylinder shell.

4. The test device for simulating railway signal cable sheath cracking according to claim 1, characterized in that: The first elastic connecting member and the second elastic connecting member are springs.

5. The test device for simulating cracking of railway signal cable sheath according to claim 1, characterized in that: An industrial camera is installed on the top of the aging box, and the industrial camera can be connected to a handheld terminal device such as a mobile phone.

6. The test device for simulating cracking of railway signal cable sheath according to claim 1, characterized in that: The test device also includes a motor detachably connected to the square shaft.

7. A test method for simulating cracking of a railway signal cable sheath, using the test device for simulating cracking of a railway signal cable sheath as claimed in any one of claims 1 to 6, characterized in that: The steps include: S1. Install the test device at the discharge port of the extrusion die, rotate the square shaft according to the outer diameter requirement, rotate the oval bidirectional cam relative to the support cylinder, adjust the diameter of the support cylinder, start the extruder, and form a complete sheath structure on the support cylinder; S2. Rotate the square shaft to rotate the oval-shaped bidirectional cam, changing the diameter of the support cylinder to simulate the thermal expansion of the steel belt and the thermal insulation layer within the sheath, thereby generating tension within the sheath. With the aid of the torque dial, quantify the tension applied to the interior of the sheath, and move the locking member so that it abuts against the oval-shaped bidirectional cam. S3. Use a utility knife to open both ends of the sheath, with the opening depth reaching the steel belt armor layer, to simulate the situation where the surface of the cable is easily scratched when being dragged in a complex high-temperature environment during on-site laying. Place the supporting cylinder wrapped with the sheath in the aging box, set the temperature of the aging box to 80°C, rotate the supporting cylinder by a square shaft, and age it for 1 hour to observe whether the sheath is cracked.

8. The test method for simulating railway signal cable sheath cracking according to claim 7, characterized in that: Sheaths with different outer diameters and thicknesses have different corresponding applied tensions.

9. The test method for simulating railway signal cable sheath cracking according to claim 7, characterized in that: Sheaths of different outer diameters and lengths have corresponding opening lengths of different lengths.

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