Power Cable Buffer Layer Defect Detection Equipment and Detection Method

Abstract

The present invention discloses a power cable buffer layer defect detection device and a detection method, which relate to the field of cables. The present invention provides a power cable buffer layer defect detection device, including a base, on both sides of the front surface of the base are fixedly connected with clamping mechanisms, and on one side of the front surface of the base perpendicular to the clamping mechanisms is fixedly connected with a support plate. The present invention can, through the signals of the travel switches, determine the positions and states of the cable under different bends, so as to provide information about the cable performance and defects. When the mechanical movement reaches the specified position, the travel switch will send a signal, and the movement can be stopped according to this signal to ensure that the bending rod stops at the required position to guarantee the accuracy and reliability of the test results. By observing the wrinkle conditions on the back surface of the cable, the stress conditions of the cable under different bending degrees can be analyzed, and thus various factors causing buffer layer defects can be obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of cables, and in particular relates to an equipment and a method for detecting defects in the buffer layer of power cables. Background Art

[0002] In the cable structure, the cable buffer layer is an important layer located between the conductor and the insulating layer. It is mainly used to protect the cable insulating layer from external physical damage and chemical corrosion. The test of the influencing factors of the cable buffer layer defects refers to testing the buffer layer of the conductive cable to determine the factors that may affect the quality and performance of the buffer layer. Through these tests, the quality and performance of the buffer layer material can be traced, potential defect problems can be discovered in time, and corresponding measures can be taken to ensure the quality and reliability of the cable.

[0003] The existing equipment for detecting defects in the buffer layer of power cables can only test one influencing factor of the cable buffer layer. While being inefficient, it cannot detect the relationship between two or more influencing factors, resulting in low practicality. For example, the relationship between the possible defects caused by the bending degree of the cable buffer layer and the defects caused by temperature to the buffer layer;

[0004] At the same time, when the existing device detects the anti-bending ability of the cable buffer layer, there are relatively easy to be different changes and problems on the back surface compared with the front surface. These problems are easily overlooked. If only observing the bending property of the front surface of the cable, it is difficult to comprehensively understand the real situation of the cable. Defects in the buffer layer may appear on the back surface of the cable, and these problems are easily overlooked only by observing the bending situation of the front surface, resulting in potential problems not being discovered and solved in time.

[0005] Therefore, the present invention provides an equipment and a method for detecting defects in the buffer layer of power cables to solve the above problems. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides an equipment and a method for detecting defects in the buffer layer of power cables, and solves the above problems.

[0007] To achieve the above object, the present invention is implemented by the following technical solutions: a power cable buffer layer defect detection device, including a base, both sides of the front surface of the base are fixedly connected with clamping mechanisms, one side of the front surface of the base perpendicular to the clamping mechanisms is fixedly connected with a support plate, a dual-axis motor is arranged inside the support plate, output ends of the dual-axis motor are fixedly connected with rotating rods, one ends of the two rotating rods far away from the dual-axis motor are fixedly connected with limiting rings, limiting grooves matching the sizes of the limiting rings are formed in the inner wall of the support plate, rotating gears are fixedly sleeved on the outer walls of the two rotating rods, grooves matching the rotating gears are formed in the inner wall of the support plate, racks matching the rotating gears are fixedly arranged inside the grooves, the rotating gears are meshed with the racks, a bent rod is fixedly connected to the outer wall of the dual-axis motor far away from the support plate, a limiting mechanism is fixedly connected to the outer wall of the bent rod, and the limiting mechanism is connected to the inner wall of the support plate.

[0008] Preferably, the limiting mechanism includes a sliding groove, the sliding groove is fixedly formed in the inner wall of the support plate, a slider is slidably connected inside the sliding groove, a limiting plate is fixedly connected to the outer wall of the bent rod, a buffer spring is fixedly connected to the inner wall of the limiting plate, a movable plate is fixedly connected to one end of the buffer spring far away from the limiting plate, a baffle is slidably connected to one end of the bent rod far away from the movable plate, both the limiting plate and the movable plate are sleeved on the outer wall of the bent rod, the baffle is slidably connected to the front surface of the base, a sliding groove is formed in the front surface of the base, a sliding block is slidably connected inside the sliding groove, the sliding block is fixedly connected to the baffle, a moving groove is formed in the surface of the baffle, the bent rod moves inside the moving groove, a fixing rod is fixedly connected to the outer wall of the slider, a limiting rod is hinged to one end of the fixing rod far away from the slider, one end of the limiting rod far away from the fixing rod is fixedly connected to the inner wall of the baffle, fixing blocks are fixedly sleeved on the outer walls of the two rotating rods, an L-shaped push rod is fixedly connected to the front surface of the fixing block, and one end of the L-shaped push rod far away from the fixing block is fixedly connected to the outer wall of the slider.

[0009] Preferably, the clamping mechanism includes vertical fixing plates, the vertical fixing plates are fixedly connected to both sides of the front surface of the base, through cavities are formed in the two vertical fixing plates, two arc-shaped plates are slidably connected to the two through cavities, temperature control curved plates are fixedly connected to the inner ends of the two arc-shaped plates, and anti-slip lines are fixedly connected to the opposite sides of the temperature control curved plates.

[0010] Preferably, a plurality of installation grooves are formed in the inner wall of the support plate, travel switches are fixedly arranged inside the plurality of installation grooves, and the travel switches are electrically connected to the dual-axis motor.

[0011] Preferably, a rubber plate is fixedly connected to the outer wall of the front surface of the bent rod. A number of convex touch balls are movably connected to the front surface of the rubber plate. A number of holes matching the convex touch balls are formed in the surface of the rubber plate. The number of convex touch balls is movably connected inside the rubber plate.

[0012] Preferably, a fixing plate is fixedly connected to the front surface of the support plate. At one end where the fixing plate contacts the baffle, a sliding groove and a sliding block identical to those formed on the surface of the base are fixedly provided.

[0013] Preferably, one end of the bent rod is fixedly connected to a temperature control component. An anti-slip pattern is provided on the back surface of the base. The outer end of the bent rod is fixedly connected to a lighting component.

[0014] A method for detecting defects in the buffer layer of a power cable includes the following steps:

[0015] S1: Pass the cable through between the transverse cavities and place it on the front surface of the bent rod. Then limit the cable through the clamping mechanism.

[0016] S2: First, drive the bent rod to continuously move upward through the double-shaft motor. Stop the double-shaft motor through the travel switch, and the specific bending angle that causes buffer layer defects at different bending degrees at the same temperature can be obtained.

[0017] S3: While pulling the cable upward, assist in blocking the cable through the limiting plate and the baffle to prevent the cable from possibly falling off when being pulled upward.

[0018] S4: Then turn on the temperature control component alone to heat the cable buffer layer, and observe the changes occurring on the surface of the cable buffer layer, so as to detect the influence of different temperatures on the buffer layer defects at the same bending degree of the cable buffer layer.

[0019] S5: Then detect the influence relationship between the bending degree and temperature of the cable on the buffer layer defects of the cable. While pulling the cable upward, heat the bent rod, and record and observe the wrinkles generated on the back surface of the cable due to bending and temperature changes through a number of convex touch balls on the rubber plate. Beneficial effects

[0020] The present invention provides a device and a method for detecting defects in the buffer layer of a power cable. Compared with the prior art, the following beneficial effects are achieved:

[0021] The stop of the bending rod at a specific position can be detected by a travel switch, and different degrees of bending can be recorded and observed. Through the signal of the travel switch, the position and state of the cable under different bends can be determined, so as to provide information about the cable performance and defects. The time relay can automatically control the start of the dual-axis motor after the dual-axis motor stops according to the preset time parameters, ensuring that the bending rod stops at the required position to ensure the accuracy and reliability of the test results. By observing the wrinkle condition on the back surface of the cable, the stress condition of the cable under different bending degrees can be analyzed, so as to obtain the bending angle that will cause defects in the buffer layer, and the bending degree that may cause defects in the buffer layer due to bending can be obtained.

[0022] The lighting component is continuously irradiated between the bending rod and the back surface of the bent cable. Observation records are made according to the light and shadow projected onto the surface of the support plate, and then the wrinkle condition on the back surface of the cable can be observed. Record this height as the limit bending height. In cooperation with the travel switch, data on the cable bending condition at different heights before the limit bending height can be recorded to further understand the influence of the bending degree on the cable buffer layer. The stress condition of the cable under different bending degrees can be analyzed, and it can be analyzed from the front and back surfaces of the cable buffer layer, making the analyzed and recorded data more comprehensive and detailed.

[0023] By setting the different performances of the cable buffer layer under different bending degrees of the cable, the limit bending degree that causes defects in the cable buffer layer due to the measured bending degree can be obtained. And by heating with the temperature control component, the limit heat resistance temperature that causes defects in the cable buffer layer can be obtained. And by the method of controlling variables, the specific temperature that causes buffer layer defects at the same bending degree under different temperatures can be obtained, and the specific bending angle that causes buffer layer defects at the same temperature under different bending degrees can also be obtained, improving the detectable range of the device. It can specifically control the corresponding temperature and bending degree according to the requirements to obtain the relationship between the two, and can better detect the specific data of the influencing factors that cause defects in the cable buffer layer. Brief Description of the Drawings

[0024] Figure 1 is a three-dimensional structural schematic diagram of the power cable buffer layer defect detection device provided by the present invention;

[0025] Figure 2 is a three-dimensional structural schematic diagram of another angle of the power cable buffer layer defect detection device provided by the present invention;

[0026] Figure 3 is a three-dimensional structural schematic diagram of part A of the power cable buffer layer defect detection device provided by the present invention;

[0027] Figure 4It is a schematic three-dimensional structure diagram of another angle of the power cable buffer layer defect detection device provided by the present invention;

[0028] Figure 5 It is a schematic three-dimensional structure diagram of part B of the power cable buffer layer defect detection device provided by the present invention;

[0029] Figure 6 It is a schematic three-dimensional structure diagram of another angle of the power cable buffer layer defect detection device provided by the present invention;

[0030] Figure 7 It is a schematic three-dimensional structure diagram of part C of the power cable buffer layer defect detection device provided by the present invention;

[0031] Figure 8 It is a schematic partial three-dimensional structure diagram of the power cable buffer layer defect detection device provided by the present invention.

[0032] In the figure: 1 base, 2 clamping mechanism, 21 vertical fixed plate, 22 transverse cavity, 23 arc plate, 24 temperature control curved plate, 3 support plate, 4 double-shaft motor, 5 rotating rod, 6 limit ring, 7 limit groove, 8 rotating gear, 9 groove, 10 rack, 11 bending rod, 110 chute, 111 slider, 112 limit plate, 113 buffer spring, 114 movable plate, 115 baffle, 116 sliding groove, 117 sliding block, 118 moving groove, 119 fixed rod, 1110 limit rod, 1111 fixed block, 1112 L-shaped push rod, 12 limit mechanism, 13 installation groove, 14 travel switch, 15 rubber plate, 16 convex touch ball, 17 fixed plate, 18 temperature control component, 19 lighting component. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0034] Please refer to Figure 1-3, A power cable buffer layer defect detection device, including a base 1. On both sides of the front surface of the base 1, clamping mechanisms 2 are fixedly connected. On one side of the front surface of the base 1 perpendicular to the clamping mechanisms 2, a support plate 3 is fixedly connected. Inside the inner wall of the support plate 3, a dual-axis motor 4 is provided. Output ends of the dual-axis motor 4 are fixedly connected with rotating rods 5. At one ends of the two rotating rods 5 far from the dual-axis motor 4, limiting rings 6 are fixedly connected. Inside the inner wall of the support plate 3, limiting grooves 7 matching the sizes of the limiting rings 6 are formed. Outer walls of the two rotating rods 5 are fixedly sleeved with rotating gears 8. Inside the inner wall of the support plate 3, grooves 9 matching the rotating gears 8 are formed. Inside the grooves 9, racks 10 matching the rotating gears 8 are fixedly arranged. The rotating gears 8 are meshed with the racks 10. On the outer wall of the dual-axis motor 4 far from the support plate 3, a bent rod 11 is fixedly connected. On the outer wall of the bent rod 11, a limiting mechanism 12 is fixedly connected. The limiting mechanism 12 is connected with the inner wall of the support plate 3. The dual-axis motor 4 can provide power to drive the rotation of the rotating gears 8, thereby driving the operation of the entire device. The dual-axis motor 4 has characteristics such as fast startup and stable rotation speed, and can provide stable power output. The engagement connection between the dual-axis motor 4 driving the rotating gears 8 and the racks 10 can realize the movement of the bent rod 11. Through the movement of the rotating gears 8 on the racks 10, the bent rod 11 can move horizontally upward to bend the cable. This mechanical linkage design enables the device to have high rotation accuracy and stability. The bent rod 11 plays a role in connecting the cable and the device, and bends the cable through horizontal upward movement. Embodiment 2

[0035] Please refer to Figure 2-8, this embodiment provides a technical solution based on Embodiment 1: The limiting mechanism 12 includes a sliding groove 110 fixedly opened on the inner wall of the support plate 3. A slider 111 is slidably connected inside the sliding groove 110. A limiting plate 112 is fixedly connected to the outer wall of the bent rod 11. A buffer spring 113 is fixedly connected to the inner wall of the limiting plate 112. One end of the buffer spring 113 away from the limiting plate 112 is fixedly connected to a movable plate 114. One end of the bent rod 11 away from the movable plate 114 is slidably connected to a baffle 115. Both the limiting plate 112 and the movable plate 114 are sleeved on the outer wall of the bent rod 11. The baffle 115 is slidably connected to the front surface of the base 1. A sliding groove 116 is opened on the front surface of the base 1. A sliding block 117 is slidably connected inside the sliding groove 116. The sliding block 117 is fixedly connected to the baffle 115. A moving groove 118 is opened on the surface of the baffle 115. The bent rod 11 moves inside the moving groove 118. A fixing rod 119 is fixedly connected to the outer wall of the slider 111. One end of the fixing rod 119 away from the slider 111 is hinged to a limiting rod 1110. One end of the limiting rod 1110 away from the fixing rod 119 is fixedly connected to the inner wall of the baffle 115. Fixing blocks 1111 are fixedly sleeved on the outer walls of both rotating rods 5. An L-shaped push rod 1112 is fixedly connected to the front surface of the fixing block 1111. One end of the L-shaped push rod 1112 away from the fixing block 1111 is fixedly connected to the outer wall of the slider 111. Through the combination of components such as the sliding groove 110, the limiting plate 112, the buffer spring 113, the movable plate 114, the baffle 115, and the limiting rod 1110, the limiting mechanism 12 can limit the movement range of the bent rod 11, ensure the stable movement of the bent rod 11 during the cable bending process, and prevent inaccurate test results caused by unstable movement. The design of components such as the limiting plate 112, the buffer spring 113, the movable plate 114, and the baffle 115 can protect the fixation of the cable on the bent rod 11.

[0036] The clamping mechanism 2 includes a vertical fixed plate 21 fixedly connected to both sides of the front surface of the base 1. Transverse cavities 22 are opened on both vertical fixed plates 21. Two arc-shaped plates 23 are slidably connected to both transverse cavities 22. Temperature control curved plates 24 are fixedly connected to the inner ends of the two arc-shaped plates 23. Anti-slip lines are fixedly connected to the opposite sides of the temperature control curved plates 24. Through the design of components such as the arc-shaped plates 23, the baffle 115, and the fixing blocks 1111 in the clamping mechanism 2, the cable can be effectively fixed to prevent the cable from shifting or falling off during the bending process. At the same time, the protrusions on the temperature control curved plates 24 can heat the cable sheath, improve the reliability and wear resistance of the cable, and also make the temperature distribution more uniform when the temperature of the cable changes. The anti-slip lines on the arc-shaped plates 23 can increase the friction between the arc-shaped plates 23 and the cable, ensuring that the cable is firmly fixed in the clamping mechanism 2.

[0037] The inner wall of the support plate 3 is provided with a plurality of installation grooves 13, and a travel switch 14 is fixedly arranged inside the plurality of installation grooves 13. The travel switch 14 is electrically connected to the double-shaft motor 4. Through the travel switch 14, it can be detected that the bending rod 11 stops at a specific position, and different degrees of bending can be recorded and observed. Through the signal of the travel switch 14, the position and state of the cable under different bends can be determined, so as to provide information about the performance and defects of the cable. When the mechanical movement reaches the specified position, the travel switch 14 will send a signal. When the double-shaft motor 4 rises to each set height, it will gradually contact each travel switch 14. The travel switch 14 is a device that can detect the position of mechanical movement. The travel switch 14 is installed at a specific position of the mechanical system. When the mechanical movement reaches the specified position, the travel switch 14 will trigger a switch signal. Through this signal, the double-shaft motor 4 can be controlled to stop moving. Then the staff will observe and record other defects such as cracks in the cable at this time. Then, through the time relay electrically connected to the double-shaft motor 4, the time relay can automatically control the start of the double-shaft motor 4 according to the preset time parameters after the double-shaft motor 4 stops, so as to ensure the accuracy and reliability of the test results. By observing the wrinkle situation on the back surface of the cable, the stress situation of the cable under different bending degrees can be analyzed, so as to obtain various factors causing buffer layer defects.

[0038] The outer wall of the front surface of the bending rod 11 is fixedly connected with a rubber plate 15. A plurality of convex touch balls 16 are movably connected to the front surface of the rubber plate 15. A plurality of holes matching the convex touch balls 16 are formed on the surface of the rubber plate 15. The plurality of convex touch balls 16 are movably connected inside the rubber plate 15.

[0039] The front surface of the support plate 3 is fixedly connected with a fixing plate 17. A sliding groove 116 and a sliding block 117 identical to those formed on the surface of the base 1 are fixedly arranged at one end of the fixing plate 17 in contact with the baffle 115.

[0040] One end of the bending rod 11 is fixedly connected with a temperature control component 18. The back surface of the base 1 is provided with anti-slip lines. The outer end of the bending rod 11 is fixedly connected with a lighting component 19.

[0041] A method for detecting defects in the buffer layer of a power cable includes the following steps:

[0042] S1: Pass the cable through between the through cavities 22 and place it on the front surface of the bending rod 11, and then limit the cable through the clamping mechanism 2.

[0043] S2: First, drive the bending rod 11 to move upward continuously through the double-shaft motor 4, and stop the double-shaft motor 4 through the travel switch 14, so as to obtain the specific bending angle of different bending degrees causing buffer layer defects at the same temperature.

[0044] S3: While pulling the cable upward, use the limit plate 112 and the baffle 115 to assist in blocking the cable to prevent the cable from falling off during the upward pull.

[0045] S4: Then, turn on the temperature control component 18 alone to heat the cable buffer layer, and observe the changes on the surface of the cable buffer layer, so as to detect the influence of different temperatures on the buffer layer defects under the same bending degree of the cable buffer layer.

[0046] S5: Then, detect the influence relationship between the bending degree and temperature of the cable on the cable buffer layer defects. While pulling the cable upward, heat the bending rod 11, and then record and observe the wrinkles generated on the back surface of the cable due to bending and temperature changes through a number of convex touch balls 16 on the rubber plate 15.

[0047] At the same time, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0048] During operation, first, the staff passes the cable to be tested through the two transverse cavities 22 respectively, and completes the limiting treatment of the cable in the two transverse cavities 22. The two arc-shaped plates 23 in two groups can be used to limit two points of the cable. Anti-slip patterns are provided on the two arc-shaped plates 23 in two groups, which can increase the friction force between the two arc-shaped plates 23 in two groups and the cable. Then, start the double-shaft motor 4, which drives the rotating rod 5 at both output ends to rotate. The rotating gear 8 is meshed with the rack 10. When the rotating rod 5 rotates, it can drive the rotating gear 8 to move on the rack 10, so that the bending rod 11 can move horizontally upward. Since the L-shaped push rod 1112 and the slider 111 slide horizontally upward in the chute 110, the bending rod 11 is driven to slide horizontally upward in the moving groove 118. The limit rod 1110 and the fixed rod 119 can synchronously adjust the distance between the baffle 115 and the support plate 3 according to the sliding height of the slider 111 in the chute 110. When the rack 10 and the rotating gear 8 are meshed and rotated, it may not be stable enough. At this time, the limit groove 7 and the limit ring 6 can be used. When the double-shaft motor 4 drives the rotating gear 8 to rotate and drive the bending rod 11 to move upward, the rotating rod 5 can be limited to prevent the test result from being unstable due to the instability of the rotating rod 5 when the cable is bent. Through the synchronous linkage of the rotating gear 8 and the rack 10, the rotation accuracy and stability are improved through the meshing of the teeth, and the vibration and noise generated by the operation of the equipment are effectively reduced.

[0049] When pulling upward at the middle position of the cable, the pulled height of the middle position of the cable buffer layer becomes higher and higher, and the cable may shift or fall off. By means of the limiting plate 112, buffer spring 113, movable plate 114 and baffle plate 115 fixedly connected to the surface of the bending rod 11, the cable is placed between the baffle plate 115 and the movable plate 114. When the bending degree of the cable being pulled up is greater, the cable may fall outward or slide inward on the bending rod 11. If the cable slides inward, the cable contacts the movable plate 114, and the movable plate 114 slides on the bending rod 11. The movable plate 114 contacts the buffer spring 113, and the buffer spring 113 receives the force from the movable plate 114 and can approach the limiting plate 112 fixedly connected to the bending rod 11. Thus, the buffer spring 113 connected to the movable plate 114 can provide a certain protective effect on the cable. At the same time, if the cable shifts outward, the provided baffle plate 115 can play a certain role in assisting to block, and the cable will not fall off, which can play an auxiliary anti-falling effect on the position of the cable. When the double-shaft motor 4 moves upward through the rotation of the rack 10 and the rotating gear 8, the fixed block 1111 can move upward through the rotating rod 5. The L-shaped push rod 1112 on the front surface of the fixed block 1111 pushes the slider 111 to slide upward inside the chute 110. The upward sliding of the slider 111 can make the fixed rod 119 drive the limiting rod 1110 to rotate. The rotation of the limiting rod 1110 can make the baffle plate 115 slide inside the sliding groove 116 during the continuous upward movement of the bending rod 11. Since one side of the bending rod 11 away from the output end of the double-shaft motor 4 is slidably connected to the outer wall of the baffle plate 115, when starting the double-shaft motor 4, it can prevent the bending rod 11 from being unevenly stressed, and at the same time can drive the bending rod 11 to move horizontally upward and can adapt to cables of various size specifications. The higher the slider 111 is, the closer the limiting rod 1110 and the fixed rod 119 can make the baffle plate 115 approach the cable for limiting. At the same time, the buffer spring 113 can relax the cable when the baffle plate 115 approaches. When the bending degree of the cable being pulled up increases, the movable plate 114 can slide and contact the buffer spring 113. Thus, when the cable is limited, the buffer spring 113 can play a role to prevent the limiting force from being too large and affecting the cable;

[0050] After that, the temperature control component 18 will be turned on separately to heat the cable buffer layer until obvious deformation occurs on the surface of the cable buffer layer. At this time, we record the temperature at this time as the ultimate heat-resistant temperature of the cable buffer layer;

[0051] After that, the relationship between the bending degree of the cable and the temperature is detected: When detecting the anti-bending ability of the cable buffer layer at normal room temperature, a travel switch 14 is arranged in each of the plurality of mounting grooves 13 during the upward movement of the bending rod 11. When the dual-axis motor 4 rises to each set height, it gradually contacts each travel switch 14. The travel switch 14 is a device that can detect the position of mechanical movement. The travel switch 14 is installed at a specific position of the mechanical system. When the mechanical movement reaches the specified position, the travel switch 14 will trigger a switch signal. Through this signal, the dual-axis motor 4 can be controlled to stop operating. Then, the staff observes and records the cracks and other defects that appear in the cable at this time. Then, through the time relay electrically connected to the dual-axis motor 4, the time relay can automatically control the start of the dual-axis motor 4 according to the preset time parameter after the dual-axis motor 4 stops. When the dual-axis motor 4 drives the rotating rod 5 to move upward for a certain time, when obvious cracks just begin to appear on the front surface of the cable, at the same time, the lighting component 19 arranged at the end of the bending rod 11 can continuously irradiate between the bending rod 11 and the back surface of the cable bend. Observe and record according to the light and shadow projected on the surface of the support plate 3, and then observe the wrinkle situation on the back surface of the cable, and record this height as the limit bending height. In cooperation with the travel switch 14, record the data of the cable bending situation at different heights before the limit bending height, so as to further understand the influence of the bending degree on the cable buffer layer, analyze the stress situation of the cable under different bending degrees, and analyze from the front and back surfaces of the cable buffer layer, so that the analyzed and recorded data is more comprehensive and detailed;

[0052] When it is necessary to detect the influence of temperature on the cable buffer layer, the staff starts the temperature control component 18 fixedly connected to the front surface of the bending rod 11. Starting the temperature control component 18 controls the temperature of the bending rod 11. Through observation and record, it is found that when the temperature is lower than the normal room temperature, when reaching the limit bending height, cracks appear faster and more easily. When the temperature is higher than the normal room temperature, when the cable is at the limit bending height, the hardness of the cable becomes lower, the cracks on the front surface are less, and the back surface of the cable is more likely to have wrinkles. The stress situation of the cable under different temperature degrees can be analyzed, and it can be analyzed from the front and back surfaces of the cable buffer layer, so that the analyzed and recorded data is more comprehensive and detailed; At the same time, several convex touch balls 16 can be used to assist in recording and observing the wrinkles on the back surface of the cable caused by bending and temperature changes. At the same time, a plurality of protrusions are arranged on the inner end surfaces of the plurality of temperature control curved plates 24 in the clamping mechanism 2. The plurality of temperature control curved plates 24 have a heating function. When the cable is fixed by two sets of two arc-shaped plates 23, it drives the plurality of temperature control curved plates 24 to move inward, so that the plurality of temperature control curved plates 24 all contact the cable, and the heating function of the plurality of temperature control curved plates 24 is started, which can assist in heating both ends of the cable and make the temperature distribution more uniform;

[0053] The power cable buffer layer defect detection device and detection method obtain the ultimate bending degree that causes defects in the cable buffer layer by setting the different performances of the cable buffer layer under different bending degrees of the cable, and obtain the ultimate heat resistance temperature that causes defects in the cable buffer layer through the heating of the temperature control component 18. Moreover, by means of the method of controlling variables, the specific temperature that causes buffer layer defects at different temperatures under the same bending degree can be obtained, and the specific bending angle that causes buffer layer defects at different bending degrees under the same temperature can also be obtained, so that the detectable range of the device is improved. It can specifically control the corresponding temperature and bending degree according to the requirements to obtain the relationship between the two, and can better detect the specific data of the influencing factors that cause defects in the cable buffer layer.

[0054] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0055] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Power cable buffer layer defect detection equipment, characterized in that: It includes a base (1). On both sides of the front surface of the base (1), a clamping mechanism (2) is fixedly connected. On one side of the front surface of the base (1) perpendicular to the clamping mechanism (2), a support plate (3) is fixedly connected. Inside the inner wall of the support plate (3), a double-shaft motor (4) is arranged. Output ends of the double-shaft motor (4) are fixedly connected with rotating rods (5). At one ends of the two rotating rods (5) far away from the double-shaft motor (4), limit rings (6) are fixedly connected. On the inner wall of the support plate (3), a limit groove (7) matching the size of the limit ring (6) is opened. Outer walls of the two rotating rods (5) are fixedly sleeved with rotating gears (8). On the inner wall of the support plate (3), a groove (9) matching the rotating gear (8) is opened. Inside the groove (9), a rack (10) matching the rotating gear (8) is fixedly arranged. The rotating gear (8) is meshed with the rack (10). On an outer wall of the double-shaft motor (4) far away from the support plate (3), a bent rod (11) is fixedly connected. On the outer wall of the bent rod (11), a limit mechanism (12) is fixedly connected. The limit mechanism (12) is connected with the inner wall of the support plate (3); The limit mechanism (12) includes a sliding groove (110). The sliding groove (110) is fixedly opened on the inner wall of the support plate (3). Inside the sliding groove (110), a sliding block (111) is slidably connected. On the outer wall of the bent rod (11), a limit plate (112) is fixedly connected. Inside the inner wall of the limit plate (112), a buffer spring (113) is fixedly connected. At one end of the buffer spring (113) far away from the limit plate (112), a movable plate (114) is fixedly connected. At one end of the bent rod (11) far away from the movable plate (114), a baffle (115) is slidably connected. Both the limit plate (112) and the movable plate (114) are sleeved on the outer wall of the bent rod (11). The baffle (115) is slidably connected to the front surface of the base (1). On the front surface of the base (1), a sliding groove (116) is opened. Inside the sliding groove (116), a sliding block is slidably connected. The sliding block is fixedly connected with the baffle (115). On the surface of the baffle (115), a moving groove (118) is opened. The bent rod (11) moves inside the moving groove (118). On the outer wall of the sliding block (111), a fixed rod (119) is fixedly connected. At one end of the fixed rod (119) far away from the sliding block (111), a limit rod (1110) is hinged. At one end of the limit rod (1110) far away from the fixed rod (119), it is fixedly connected to the inner wall of the baffle (115). Outer walls of the two rotating rods (5) are fixedly sleeved with fixed blocks (1111). On the front surface of the fixed block (1111), an L-shaped push rod (1112) is fixedly connected. At one end of the L-shaped push rod (1112) far away from the fixed block (1111), it is fixedly connected with the outer wall of the sliding block (111); One end of the bent rod (11) is fixedly connected with a temperature control component (18), the back surface of the base (1) is provided with anti-slip lines, and the outer end of the bent rod (11) is fixedly connected with a lighting component (19).

2. The power cable buffer layer defect detection device according to claim 1, characterized in that: The clamping mechanism (2) includes a vertical fixed plate (21), the vertical fixed plate (21) is fixedly connected to both sides of the front surface of the base (1), through cavities (22) are formed in both of the vertical fixed plates (21), two arc-shaped plates (23) are slidably connected to both of the through cavities (22), temperature control curved plates (24) are fixedly connected to the inner ends of the two arc-shaped plates (23), and anti-slip lines are fixedly connected to the opposite sides of the temperature control curved plates (24).

3. The power cable buffer layer defect detection device according to claim 2, characterized in that: A plurality of mounting grooves (13) are formed in the inner wall of the support plate (3), and travel switches (14) are fixedly arranged inside the plurality of mounting grooves (13), and the travel switches (14) are electrically connected to the bi-axial motor (4).

4. The power cable buffer layer defect detection device according to claim 3, characterized in that: A rubber plate (15) is fixedly connected to the outer wall of the front surface of the bent rod (11), a plurality of protruding touch balls (16) are movably connected to the front surface of the rubber plate (15), a plurality of holes matching the protruding touch balls (16) are formed in the surface of the rubber plate (15), and the plurality of protruding touch balls (16) are movably connected inside the rubber plate (15).

5. The power cable buffer layer defect detection device according to claim 4, wherein: A fixed plate (17) is fixedly connected to the front surface of the support plate (3), and a sliding groove (116) and a sliding block which are the same as those formed on the surface of the base (1) are fixedly arranged at one end of the fixed plate (17) which contacts the baffle (115).

6. Method for detecting defects in the buffer layer of a power cable, using the power cable buffer layer defect detection device as described in claim 5, characterized in that: Comprising the following steps: S1: Pass the cable through between the through cavities (22), and place it on the front surface of the bent rod (11), and then limit the cable through the clamping mechanism (2). S2: First, drive the bent rod (11) to continuously move upward through the bi-axial motor (4), and stop the bi-axial motor (4) through the travel switch (14), so as to obtain the specific bending angles of different bending degrees at the same temperature that cause defects in the buffer layer. S3: While pulling the cable upward, assist in blocking the cable through the limiting plate (112) and the baffle (115) to prevent the cable from falling off during the upward pulling. S4: Then, turn on the temperature control component (18) alone to heat the cable buffer layer, and observe the changes occurring on the surface of the cable buffer layer, so as to detect the influence of different temperatures at the same bending degree on the cable buffer layer defects. S5: Then, detect the influence relationship between the bending degree and temperature of the cable on the cable buffer layer defects. While pulling the cable upward, heat the bent rod (11), and record and observe the wrinkles generated on the back surface of the cable due to bending and temperature changes through the plurality of protruding touch balls (16) on the rubber plate (15).

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