Cable sag characteristic experiment device and method

Abstract

The invention provides a cable sag characteristic experiment device and method, and belongs to the technical field of sag characteristic test.The device comprises a fixed part, a movable part, a heating assembly and a winding assembly; the fixing piece is used for being connected with one end of a cable; the moving part is arranged on the outer side of the fixed part in a sliding manner and is provided with a locking component used for being connected with or separated from a cable so as to form a to-be-tested cable section between the fixed part and the moving part; the adjacent sides of the movable part and the fixed part are of open structures; when the moving part moves to abut against the fixed part, the two groups of open structures are closed to form a sealing cavity for a cable section to be detected to enter; the heating assembly is used for heating the sealing cavity; the winding assembly is used for being connected with the other end of the cable. According to the cable sag characteristic experiment device and method provided by the invention, the length, stress and temperature parameters of the to-be-tested cable section can be flexibly adjusted, the cable sag characteristic experiment device and method are suitable for sag characteristic research of cables of different specifications, and the efficiency and data reliability of cable sag characteristic experiments are improved.

Description

Technical Field

[0001] This invention belongs to the field of sag characteristic testing technology, and more specifically, relates to a cable sag characteristic experimental device and method. Background Technology

[0002] Sag refers to the maximum vertical distance formed by the natural drooping of an overhead cable between its two ends. This parameter is a key indicator for the design and operation of overhead lines. Reasonable sag control can prevent excessive tension due to insufficient sag, and can also prevent the risk of cable swaying under adverse weather conditions due to excessive sag.

[0003] During the cable production stage, it is necessary to conduct experimental tests on its sag characteristics. The conventional experimental method is to measure the sag change of the cable by controlling parameters such as cable temperature, tension, and span.

[0004] The inventors discovered that in existing technologies, the control of different parameters is performed independently. That is, when it is necessary to control cable temperature, tension, and span, relevant systems are used to adjust temperature, tension, and span separately. However, when adjusting a single parameter, it is inevitable that other parameters will be affected. For example, when adjusting tension and span, the temperature parameter will gradually decrease due to environmental influences; when adjusting temperature, since the cable is already at an unnatural temperature, conventional tension adjustment methods will produce certain errors; and when adjusting span, the tension on the cable will also show a certain trend of change.

[0005] In summary, there is an urgent need in the existing technology for a cable sag characteristic experimental device that can simultaneously control multiple sets of parameters and ensure that the parameters do not affect each other, as well as an experimental method based on such a device. Summary of the Invention

[0006] The purpose of this application is to provide a test device and method for cable sag characteristics, so as to solve the problem that the existing technology lacks a test device and method for cable sag characteristics that can simultaneously control multiple sets of parameters and that the parameters do not affect each other.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows: A test apparatus for cable sag characteristics is provided, comprising: A fastener used to connect to one end of a cable; A movable component, slidably disposed outside the fixed component, has a locking member for connecting or disconnecting from a cable to form a cable segment to be tested between the fixed component and the movable component; both adjacent sides of the movable component and the fixed component adopt an open structure; when the movable component moves to abut against the fixed component, the two sets of open structures close to form a sealed cavity for the cable segment to be tested to enter; A heating assembly is used to heat the sealed cavity to bring the cable segment under test to a preset temperature; and A winding assembly is used to connect to the other end of the cable to wind or unwind the cable, thereby bringing the cable segment under test to a preset length. When the cable segment under test reaches the preset length, the cable segment under test can reach the preset stress synchronously by adjusting the distance between the moving part and the fixing part to a preset gap.

[0008] In one possible implementation, the cable sag characteristic experimental apparatus further includes: The aligning seat is slidably disposed between the fixed member and the movable member; when the distance between the movable member and the fixed member reaches the preset gap, the aligning seat can slide to the midpoint position between the movable member and the fixed member; and A sag monitoring component is mounted on the alignment seat; When the positioning seat is at the midpoint between the moving part and the fixed part, the sag monitoring component is used to monitor the sag of the cable segment under test.

[0009] In one possible implementation, the cable sag characteristic experimental apparatus further includes: A synchronous drive mechanism is connected to the moving member and the positioning seat for driving the moving member and the positioning seat to move at different speeds; when the moving member and the positioning seat move, the positioning seat is located at the midpoint between the moving member and the fixed member.

[0010] In one possible implementation, the synchronous drive mechanism includes: Two first sprockets are arranged side by side along the arrangement direction of the moving member and the fixed member; each first sprocket has a degree of freedom to rotate along its own axis, and the axis and rotation axis of each first sprocket are perpendicular to the arrangement direction of the moving member and the fixed member; one of the first sprockets is driven to a first rotating motor; Two second sprockets are coaxially connected to two first sprockets, and the number of teeth on each second sprocket is half the number of teeth on each first sprocket; and Two chains, one of which is fitted onto the two first sprockets and connected to the moving part; the other chain is fitted onto the two second sprockets and connected to the positioning seat; When the first rotating motor drives the first sprocket to rotate, the second sprocket rotates synchronously. The two chains respectively drive the alignment seat and the moving member to move, and the moving distance of the alignment seat is half the moving distance of the moving member, so that the alignment seat is in the middle position between the moving member and the fixed member.

[0011] In one possible implementation, the sag monitoring component includes: A lifting seat is slidably connected to the alignment seat in the vertical direction and is driven by a lifting drive mechanism; a marking strip is provided on the lifting seat, and the marking strip is arranged horizontally side by side at the drooping part of the cable segment to be tested as the lifting seat moves; and A marking component is disposed on the lifting base and is used to move with the lifting base to be located on both sides of the cable segment to be tested, respectively, from the marking strip. The marking member is used to spray marking medium toward the marking strip so that the surface of the marking strip forms a marking pattern that reflects the partial outline of the cable segment to be tested.

[0012] In one possible implementation, the marking strip is made of a flexible material, and the lifting seat is further provided with a switching component that connects to the marking strip; the switching component includes: Two rotating rollers are respectively connected to both ends of the marking strip, and the two ends of the marking strip are respectively wound around the two rotating rollers; each rotating roller is rotatably connected to the lifting seat, and the rotation axis of each rotating roller is parallel to the vertical direction; and A second rotating motor is mounted on the lifting seat, and its output shaft is connected to one of the rotating rollers via a transmission. When the second rotating motor drives the rotating roller to rotate, the rotating roller can provide tension to the marking strip so that the marking strip is wrapped around the rotating roller; at the same time, another rotating roller rotates synchronously under the action of the marking strip to release the marking strip.

[0013] In one possible implementation, the marking component includes: A nozzle is mounted on the lifting base, and the nozzle is arranged side by side with the marking strip; the discharge port of the nozzle is oriented towards the marking strip; and A feeding component is mounted on the lifting base and communicates with the nozzle. The feeding component is used to store and pump the marking medium; when the feeding component is activated, the nozzle can spray the marking medium toward the marking strip.

[0014] In one possible implementation, the locking component includes: A tray, horizontally mounted on the movable member, is used to support the cable and allows the cable to slide relative to the tray as it moves; and A pressure plate is slidably connected to the moving member in the vertical direction and is located above the support plate; the pressure plate is driven by a linear drive member, which is used to drive the pressure plate to move toward or away from the support plate; When the linear drive member moves the pressure plate toward the support plate, the pressure plate and the support plate are adapted to clamp the upper and lower sides of the cable to fix the cable to the moving member.

[0015] In one possible implementation, the winding component includes: A take-up roller, rotatably mounted outside the moving part and connected to the end of the cable, is used to wind up or unwind the cable; and The third rotating motor has its power output shaft connected to the winding roller so that the winding roller rotates around its own axis. A tension sensor is provided between the take-up roller and the moving part, and the tension sensor is used to connect to the cable; when the locking member is separated from the cable, the tension sensor can measure the tension of the cable between the take-up roller and the fixing member.

[0016] In this embodiment, firstly, one end of the cable is fixed to the fixing member, and the other end is connected to the winding assembly. The moving member is adjusted to abut against the fixing member, at which point the two sets of open structures close to form a sealed cavity. The cable is fixed by the locking member to form the cable segment to be tested. Subsequently, the winding assembly winds or releases the cable to a preset length, and the distance between the moving member and the fixing member is adjusted to a preset gap so that the cable segment to be tested reaches the preset stress synchronously. Finally, the heating assembly is activated to heat the sealed cavity so that the cable segment to be tested reaches the preset temperature, thus completing the sag characteristic test.

[0017] Compared with the prior art, the cable sag characteristic testing device provided in this application embodiment achieves rapid clamping and sealed environment construction of the cable segment to be tested through the open structure design of the fixed and moving parts. Combined with the heating component, the temperature conditions can be precisely controlled. The winding component and the spacing adjustment mechanism work together to simultaneously adjust the preset length and stress of the cable, improve the parameter control accuracy and operation convenience, and ensure that the sag characteristic test is carried out efficiently under controllable temperature field and stress conditions, providing a reliable experimental basis for cable performance evaluation.

[0018] The technical solution adopted in this application also provides a method for testing the sag characteristics of cables, and a test device for testing the sag characteristics of cables based on any one of the foregoing contents, including the following steps: A. Connect one end of the cable to the fixing member and wind the other end onto the winding assembly; connect the cable between the fixing member and the winding assembly to the moving member through the locking member to form a cable segment to be tested between the fixing member and the moving member; B. Control the locking component to separate from the cable; activate the winding assembly to wind or release the cable, while manually intervening to make the cable segment under test reach the preset length; C. Control the locking component to connect the moving part to the cable; adjust the moving part to move it to abut against the fixing component to form the sealing cavity; simultaneously, manually intervene to allow the cable segment to be tested to enter the sealing cavity; D. Turn on the heating component to heat the sealed cavity, so that the cable segment under test reaches the preset temperature; E. Adjust the moving part to move away from the fixed part, so that the distance between the moving part and the fixed part reaches the preset distance, and so that the cable segment to be tested reaches the preset stress synchronously; D. Record the sag curve and morphological data of the cable segment under test in real time at the current temperature; E. Repeat steps B to D to obtain multiple sets of cable sag characteristic data under different parameter conditions.

[0019] The beneficial effects of the cable sag characteristic test method provided in this embodiment are the same as those of the aforementioned cable sag characteristic test device, and will not be repeated here. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A three-dimensional structural diagram of the cable sag characteristic experimental device provided in an embodiment of the present invention. Figure 1 ; Figure 2 A three-dimensional structural diagram of the cable sag characteristic experimental device provided in an embodiment of the present invention. Figure 2 ; Figure 3 for Figure 2 A partial cross-sectional view of the experimental setup for cable sag characteristics is shown. Figure 4 for Figure 1 Enlarged structural diagram of region A in the middle; Figure 5 for Figure 1 A magnified structural diagram of region B in the middle; Figure 6 This is a three-dimensional structural schematic diagram of the synchronous drive mechanism used in the embodiments of the present invention; Figure 7 This is a three-dimensional structural diagram of the moving part and locking component used in the embodiments of the present invention; The following are the labeling elements in the figure: 1. Fixing component; 2. Moving component; 21. Open structure; 22. Sealed cavity; 3. Locking component; 31. Support plate; 32. Pressure plate; 33. Linear drive component; 4. Heating component; 5. Rewinding component; 51. Rewinding roller; 52. Third rotary motor; 53. Tension sensor; 6. Alignment seat; 7. Sag monitoring component; 71. Lifting seat; 711. Marking tape; 72. Marking component; 721. Nozzle; 722. Feeding component; 8. Synchronous drive mechanism; 81. First sprocket; 82. Second sprocket; 83. Chain; 84. First rotary motor; 9. Switching component; 91. Rotary roller; 92. Second rotary motor; a1. Cable; a2. Cable segment to be tested. Detailed Implementation

[0022] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] Please refer to the following: Figures 1 to 7 The cable sag characteristic test apparatus and method provided in this application are described below. The cable sag characteristic test apparatus includes a fixing component 1, a moving component 2, a heating component 4, and a winding component 5.

[0027] The fastener 1 is used to connect to one end of the cable a1.

[0028] The movable component 2 is slidably disposed outside the fixed component 1 and has a locking member 3 for connecting or disconnecting from the cable a1, thereby forming a segment of the cable a1 to be tested located between the fixed component 1 and the movable component 2. Both adjacent sides of the movable component 2 and the fixed component 1 employ open structures 21. When the movable component 2 moves to abut against the fixed component 1, the two sets of open structures 21 close, forming a sealed cavity 22 for the segment of the cable a1 to be tested to enter. A temperature sensor can be installed inside the sealed cavity 22, and the temperature sensor can be preset to a temperature according to experimental requirements.

[0029] Heating component 4 is used to heat the sealed cavity 22. Heating component 4 can be equipped with hot air heating, infrared heating or electromagnetic induction heating, etc., so that the cable segment a1 under test reaches the preset temperature.

[0030] The winding assembly 5 is used to connect to the other end of the cable a1 to wind or release the cable a1 so that the section of the cable a1 to be tested reaches the preset length; when the section of the cable a1 to be tested reaches the preset length, by adjusting the distance between the moving part 2 and the fixing part 1 to the preset gap, the section of the cable a1 to be tested can reach the preset stress synchronously.

[0031] The cable a1 is clamped by the fixing component 1 and the moving component 2 to form the test section. The temperature inside the sealed cavity 22 is controlled by the heating component 4. The length and stress of the cable a1 are adjusted by the winding component 5 to realize the sag characteristic test under different temperature and stress conditions.

[0032] Precise temperature control is achieved through the sealed cavity 22, and stress and length are controlled simultaneously by combining winding and spacing adjustment, ensuring a stable experimental environment and reliable test data.

[0033] In this embodiment, firstly, one end of cable a1 is fixed to the fixing member 1, and the other end is connected to the winding assembly 5. The moving member 2 is adjusted to abut against the fixing member 1. At this time, the two sets of open structures 21 close to form a sealed cavity 22. The cable a1 is fixed by the locking member 3 to form the cable a1 segment to be tested. Subsequently, the winding assembly 5 winds or releases the cable a1 to a preset length, and the distance between the moving member 2 and the fixing member 1 is adjusted to a preset gap so that the cable a1 segment to be tested reaches the preset stress synchronously. Finally, the heating assembly 4 is activated to heat the sealed cavity 22 so that the cable a1 segment to be tested reaches the preset temperature, and the sag characteristic test is completed.

[0034] Compared with the prior art, the cable sag characteristic experimental device provided in this application embodiment achieves rapid clamping and sealed environment construction of the cable segment a1 under test through the open structure 21 of the fixing component 1 and the moving component 2. Combined with the heating component 4, the temperature conditions can be precisely controlled. The winding component 5 and the spacing adjustment mechanism work together to simultaneously adjust the preset length and stress of the cable a1, improve the parameter control accuracy and operation convenience, and ensure that the sag characteristic test is carried out efficiently under controllable temperature field and stress conditions, providing a reliable experimental basis for the performance evaluation of cable a1.

[0035] In some embodiments, the above-mentioned cable sag characteristic test apparatus can be adopted as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The cable sag characteristic test device also includes a positioning base 6 and a sag monitoring component 7.

[0036] The alignment seat 6 is slidably disposed between the fixed part 1 and the movable part 2; when the distance between the movable part 2 and the fixed part 1 reaches the preset distance, the alignment seat 6 can slide to the midpoint position between the movable part 2 and the fixed part 1.

[0037] The sag monitoring component 7 is mounted on the alignment seat 6.

[0038] When the positioning seat 6 is at the midpoint between the moving part 2 and the fixed part 1, the sag monitoring component 7 is used to monitor the sag of the cable segment a1 under test.

[0039] After the distance between the moving part 2 and the fixed part 1 reaches the preset distance, the positioning seat 6 slides to the midpoint between the two; the sag monitoring component 7 is activated to monitor and record the sag of the cable segment a1 under test.

[0040] A sliding alignment seat 6 is added between the fixed part 1 and the movable part 2. The sag of the cable a1 is measured in real time at the midpoint of the span by the sag monitoring component 7, which improves the measurement accuracy.

[0041] A laser rangefinder and a high-definition camera can be integrated on the alignment base 6 to simultaneously acquire the sag and the surface morphology of cable a1; or a horizontal fine-tuning mechanism can be added to the alignment base 6 to adapt to the midpoint offset problem caused by uneven ground.

[0042] By adopting the above technical solutions, the asymmetric sag error is eliminated through the midpoint alignment design, ensuring that the sag measurement point is located at the geometric center of the span, thus improving data accuracy; the sliding structure of the positioning seat 6 is adapted to different span scenarios.

[0043] In some embodiments, the above-mentioned cable sag characteristic test apparatus can be adopted as follows: Figure 1 , Figure 2 and Figure 6 The structure shown is described in the following document. Figure 1 , Figure 2and Figure 6 The cable sag characteristic test device also includes a synchronous drive mechanism 8.

[0044] The synchronous drive mechanism 8 is connected to the moving part 2 and the positioning seat 6 for driving the moving part 2 and the positioning seat 6 to move at different speeds; when the moving part 2 and the positioning seat 6 move, the positioning seat 6 is at the midpoint between the moving part 2 and the fixed part 1.

[0045] When the synchronous drive mechanism 8 is activated, it can drive the moving part 2 and the positioning seat 6 to move at a preset speed ratio. When the moving part 2 moves away from the fixed part 1, the positioning seat 6 moves synchronously at half the speed of the moving part 2, and is always at the midpoint of the distance between the moving part 2 and the fixed part 1.

[0046] The synchronous drive mechanism 8 drives the moving part 2 and the alignment seat 6 in linkage through different transmission ratios, so that the alignment seat 6 is always kept at the midpoint between the fixed part 1 and the moving part 2, without the need for manual adjustment.

[0047] By adopting the above technical solution, real-time synchronization between the moving part 2 and the alignment seat 6 can be achieved, avoiding the lag and error of manual alignment; simplifying the operation process and improving experimental efficiency.

[0048] In some embodiments, the aforementioned synchronous drive mechanism 8 may employ, for example... Figure 1 , Figure 2 and Figure 6 The structure shown is described in the following document. Figure 1 , Figure 2 and Figure 6 The synchronous drive mechanism 8 includes two first sprockets 81, two second sprockets 82, and two chains 83.

[0049] Two first sprockets 81 are arranged side by side along the arrangement direction of the moving part 2 and the fixed part 1; each first sprocket 81 has a degree of freedom to rotate along its own axis, and the axis of rotation and the axis of rotation of each first sprocket 81 are perpendicular to the arrangement direction of the moving part 2 and the fixed part 1; one of the first sprockets 81 is connected to a first rotating motor 84.

[0050] Two second sprockets 82 are coaxially connected to two first sprockets 81, and the number of teeth on the second sprockets 82 is half the number of teeth on the first sprockets 81.

[0051] One of the two chains 83 is fitted onto the two first sprockets 81 and connected to the moving part 2; the other chain 83 is fitted onto the two second sprockets 82 and connected to the positioning seat 6.

[0052] When the first rotating motor 84 drives the first sprocket 81 to rotate, the second sprocket 82 rotates synchronously. The two chains 83 drive the positioning seat 6 and the moving part 2 to move respectively, and the moving distance of the positioning seat 6 is half the moving distance of the moving part 2, so that the positioning seat 6 is in the middle position between the moving part 2 and the fixed part 1.

[0053] The first rotating motor 84 drives the first sprocket 81 to rotate, which in turn drives the moving part 2 to move via the chain 83; the second sprocket 82 (with half the number of teeth of the first sprocket 81) connected coaxially rotates synchronously, which drives the positioning seat 6 to move at half the speed via another chain 83.

[0054] The speed difference between the moving part 2 and the positioning seat 6 is achieved by using two sets of sprockets and chains 83 with a tooth ratio of 2:1 (the speed of the moving part 2 is twice that of the positioning seat 6), ensuring that the positioning seat 6 is always located at the midpoint.

[0055] The chain 83 can be replaced by a gear and rack drive to reduce maintenance requirements; a tension wheel can be added to adjust the tension of the chain 83, making it suitable for long-term, high-frequency use scenarios.

[0056] By adopting the above technical solutions, the mechanical transmission structure is stable and reliable, the transmission ratio is accurate, and the delay problem of electronic synchronization is avoided; the sprocket and chain 83 design has a strong load-bearing capacity and is suitable for long-span cable a1 experiments.

[0057] In some embodiments, the sag monitoring component 7 described above can be adopted as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The sag monitoring component 7 includes a lifting seat 71 and a marking component 72.

[0058] The lifting seat 71 is slidably connected to the positioning seat 6 in the vertical direction and is connected to the lifting drive mechanism; the lifting seat 71 is provided with a marking strip 711, which is used to move with the lifting seat 71 to the drooping part of the cable a1 segment to be tested and is arranged in parallel in the horizontal direction.

[0059] The marking component 72 is mounted on the lifting seat 71 and is used to move with the lifting seat 71 to both sides of the cable segment a1 to be tested, which are respectively located on the marking strip 711.

[0060] The marking member 72 is used to spray marking medium toward the marking tape 711 so that the surface of the marking tape 711 forms a marking pattern that reflects the partial outline of the cable segment a1 under test.

[0061] After the positioning seat 6 reaches the midpoint, the lifting seat 71 is adjusted to be parallel to the cable a1 in the horizontal direction; the marking component 72 is activated, spraying marking medium onto the marking strip 711 to form a contour map corresponding to the sag of the cable a1.

[0062] The lifting seat 71 drives the marking strip 711 and the marking component 72 to move up and down. The marking component 72 sprays the medium onto the marking strip 711 to record the sag profile of the cable a1, thereby realizing the visual monitoring of the sag shape.

[0063] By adopting the above technical solution, the marking component 72 can directly record the shape of the sag curve, and the sag curve can be measured and analyzed later. Compared with traditional point measurement, it is more intuitive and faster, avoiding the temperature drop of cable a1 due to excessive measurement time, thus making the measurement structure more accurate. The flexible marking tape 711 can continuously record multiple sets of data without frequent replacement.

[0064] In some embodiments, the switching component 9 described above may employ, for example... Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The marking strip 711 is made of flexible material, and the lifting seat 71 is also equipped with a switching component 9 connected to the marking strip 711; the switching component 9 includes two rotating rollers 91 and a second rotating motor 92.

[0065] Two rotating rollers 91 are connected to both ends of the marking strip 711, and both ends of the marking strip 711 are wound around the two rotating rollers 91 respectively; each rotating roller 91 is rotatably connected to the lifting seat 71, and the rotation axis of each rotating roller 91 is parallel to the up and down direction.

[0066] The second rotating motor 92 is mounted on the lifting seat 71, and its output shaft is connected to one of the rotating rollers 91.

[0067] When the second rotating motor 92 drives the rotating roller 91 to rotate, the rotating roller 91 can provide tension to the marking strip 711 so that the marking strip 711 is wrapped around the rotating roller 91; at the same time, another rotating roller 91 rotates synchronously under the action of the marking strip 711 to release the marking strip 711.

[0068] After a single measurement is completed, the second rotating motor 92 drives the rotating roller 91 to rotate, winding the used marking tape 711 around, while releasing new blank areas; the marking tape 711 remains taut under tension to ensure clear marking.

[0069] The marking belt 711 is driven to move cyclically by the rotating roller 91 and the second rotating motor 92, and the marking area is automatically changed to realize continuous experimentation.

[0070] An image sensor can be integrated into the switching component 9 to detect the usage status of the marker strip 711 and automatically trigger the switching; a dual marker strip 711 structure is adopted to achieve dual-channel parallel recording.

[0071] By adopting the above technical solution, the switching of the marker tape 711 can be realized automatically, reducing manual intervention and improving the continuity of experiments; the flexible marker tape 711 is designed to adapt to the recording needs of different sag heights.

[0072] In some embodiments, the marking member 72 may be employed as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The marking component 72 includes a nozzle 721 and a feeding component 722.

[0073] The nozzle 721 is mounted on the lifting base 71 and is arranged side by side with the marking strip 711; the discharge port of the nozzle 721 faces the marking strip 711. The nozzle 721 has multiple nozzles arranged side by side, and the spray direction of the multiple nozzles is all arranged in the horizontal direction.

[0074] The feeding component 722 is mounted on the lifting base 71 and is connected to the spray head 721. The feeding component 722 can be a spraying machine or a high-pressure pump.

[0075] The feeding component 722 is used to store and pump the marking medium; when the feeding component 722 is activated, the nozzle 721 can spray the marking medium toward the marking strip 711.

[0076] The feeding component 722 pumps the marking medium to the nozzle 721; the nozzle 721 moves along the sag direction of the cable a1 under the drive of the lifting seat 71, or sprays at a fixed position to form a continuous marking line.

[0077] The nozzle 721 works in conjunction with the feeding component 722 to precisely spray the marking medium (such as pigment or ink) onto the marking strip 711, forming a clear sag outline mark.

[0078] By adopting the above technical solution, the spraying of the marking medium is highly controllable, and can be adapted to different cable a1 diameters by adjusting the pressure and nozzle 721 orifice diameter; the sealing design of the feeding component 722 avoids medium leakage and is easy to maintain.

[0079] In some embodiments, the locking member 3 described above may be as follows: Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 7 The structure shown is described in the following document. Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 7 The locking component 3 includes a support plate 31 and a pressure plate 32.

[0080] The tray 31 is horizontally mounted on the movable part 2 to support the cable a1, and can also slide relative to the tray 31 when the cable a1 moves.

[0081] The pressure plate 32 is slidably connected to the moving part 2 in the vertical direction and is located on the upper side of the support plate 31; the pressure plate 32 is connected to a linear drive member 33, which is used to drive the pressure plate 32 to move toward or away from the support plate 31.

[0082] When the linear drive member 33 drives the pressure plate 32 to move toward the support plate 31, the pressure plate 32 and the support plate 31 are adapted to clamp the upper and lower sides of the cable a1 so as to fix the cable a1 to the moving member 2.

[0083] Cable a1 is placed on tray 31. Linear drive component 33 can drive pressure plate 32 downward to clamp cable a1 with tray 31 to fix it. During the experimental adjustment stage, pressure plate 32 moves upward to release cable a1, allowing cable a1 to move freely.

[0084] The cable a1 is supported by the support plate 31, and the pressure plate 32 moves up and down to clamp / release. The locking component 3 can quickly fix or separate the cable a1 to adapt to the switching of the cable a1 state at different stages of the experiment.

[0085] A rubber pad can be added to the contact surface between the tray 31 and the pressure plate 32 to increase friction and prevent the cable a1 from slipping; or a pressure sensor can be integrated on the pressure plate 32 to provide feedback on the clamping force and achieve intelligent control.

[0086] By adopting the above technical solution, the clamping force of the pressure plate 32 is adjustable, avoiding damage to the surface of the cable a1; the sliding design of the support plate 31 and the cable a1 reduces the frictional resistance when adjusting the cable a1.

[0087] In some embodiments, the winding component 5 described above may employ, for example... Figure 1 and Figure 2 The structure shown is described in the following document. Figure 1 and Figure 2 The winding assembly 5 includes a winding roller 51 and a third rotating motor 52.

[0088] The take-up roller 51 is rotatably mounted on the outside of the moving part 2 and is connected to the end of the cable a1 for winding or unwinding the cable a1.

[0089] The power output shaft of the third rotary motor 52 is connected to the winding roller 51 so that the winding roller 51 rotates around its own axis.

[0090] A tension sensor 53 is provided between the take-up roller 51 and the moving part 2. The tension sensor 53 is used to connect to the cable a1. When the locking member 3 is separated from the cable a1, the tension sensor 53 can measure the tension of the cable a1 between the take-up roller 51 and the fixing member 1.

[0091] When the locking component 3 is separated, the third rotating motor 52 drives the winding roller 51 to rotate, winding / releasing the cable a1; the tension sensor 53 provides feedback on the tension value, and stops adjusting after reaching the preset stress.

[0092] The take-up roller 51 is driven by the third rotary motor 52 to take up / release the cable a1 to adjust its length; the tension sensor 53 monitors the tension of the cable a1 in real time to ensure stress control accuracy.

[0093] A magnetic powder brake can be used to replace the third rotary motor 52 to achieve constant tension winding; or a cable a1 guide wheel group can be added between the winding roller 51 and the moving part 2 to avoid cable a1 from deflection or twisting during the winding process.

[0094] By adopting the above technical solution, it is possible to conduct closed-loop control of the experimental tension, achieve precise stress adjustment, and avoid damage to cable a1 caused by over-tension; the take-up roller 51 and tension sensor 53 are integrated into one design, simplifying the system structure.

[0095] The technical solution adopted in this application also provides a method for testing the sag characteristics of cables, and a test device for testing the sag characteristics of cables based on any of the foregoing contents, including the following steps: A. Connect one end of cable a1 to the fixing member 1 and the other end to the winding assembly 5; connect cable a1 between the fixing member 1 and the winding assembly 5 to the moving member 2 through the locking member 3 to form the cable a1 segment to be tested between the fixing member 1 and the moving member 2.

[0096] B. Control the locking component 3 to separate from the cable a1; open the winding component 5 to wind or release the cable a1, and at the same time, manually intervene to make the cable a1 segment under test reach the preset length.

[0097] C. Control the locking component 3 to connect the moving part 2 to the cable a1; adjust the moving part 2 to move it to abut against the fixing part 1 to form a sealed cavity 22; at the same time, manually intervene to make the cable a1 segment to be tested enter the sealed cavity 22.

[0098] D. Turn on the heating component 4 to heat the sealed cavity 22, so that the cable segment a1 under test reaches the preset temperature.

[0099] E. Adjust the moving part 2 to move away from the fixed part 1 so that the distance between the moving part 2 and the fixed part 1 reaches the preset distance and the cable segment a1 under test reaches the preset stress synchronously.

[0100] D. Record the sag curve and shape data of segment a1 of the cable under test in real time at the current temperature.

[0101] E. Repeat steps B to D to obtain multiple sets of cable a1 sag characteristic data under different parameter conditions.

[0102] By repeatedly adjusting parameters such as temperature, stress, and span, multiple sets of sag characteristic data were obtained to construct a model of the relationship between cable a1 sag and environmental parameters. The work steps were: installing cable a1 to form the test section, adjusting the length and temperature, setting the span and stress, recording sag data, repeating the experiment by changing parameters (such as temperature and stress), and summarizing and analyzing multiple sets of data.

[0103] The above experimental procedures ensure data comparability, and the multi-parameter combination test covers complex working conditions, providing a comprehensive basis for the design and maintenance of cable A1.

[0104] The beneficial effects of the cable sag characteristic test method provided in this embodiment are the same as those of the aforementioned cable sag characteristic test device, and will not be repeated here.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test apparatus for cable sag characteristics, characterized in that, include: A fastener used to connect to one end of a cable; A movable component, slidably disposed outside the fixed component, has a locking member for connecting or disconnecting from a cable to form a cable segment to be tested between the fixed component and the movable component; both adjacent sides of the movable component and the fixed component adopt an open structure; when the movable component moves to abut against the fixed component, the two sets of open structures close to form a sealed cavity for the cable segment to be tested to enter; A heating component is used to heat the sealed cavity so that the cable segment under test reaches a preset temperature. as well as A winding assembly is used to connect to the other end of a cable to wind or unwind the cable so that the cable segment under test reaches a preset length. When the cable segment under test reaches the preset length, the distance between the moving part and the fixed part can be adjusted to the preset gap to make the cable segment under test reach the preset stress synchronously.

2. The cable sag characteristic experimental apparatus as described in claim 1, characterized in that, The cable sag characteristic experimental device also includes: The aligning seat is slidably disposed between the fixed member and the movable member; when the distance between the movable member and the fixed member reaches the preset gap, the aligning seat can slide to the midpoint position between the movable member and the fixed member; and A sag monitoring component is mounted on the alignment seat; When the positioning seat is at the midpoint between the moving part and the fixed part, the sag monitoring component is used to monitor the sag of the cable segment under test.

3. The cable sag characteristic experimental apparatus as described in claim 2, characterized in that, The cable sag characteristic experimental device also includes: A synchronous drive mechanism is connected to the moving member and the positioning seat for driving the moving member and the positioning seat to move at different speeds; when the moving member and the positioning seat move, the positioning seat is located at the midpoint between the moving member and the fixed member.

4. The cable sag characteristic test apparatus as described in claim 3, characterized in that, The synchronous drive mechanism includes: Two first sprockets are arranged side by side along the arrangement direction of the moving member and the fixed member; each first sprocket has a degree of freedom to rotate along its own axis, and the axis and rotation axis of each first sprocket are perpendicular to the arrangement direction of the moving member and the fixed member; one of the first sprockets is driven to a first rotating motor; Two second sprockets are coaxially connected to two first sprockets, and the number of teeth on each second sprocket is half the number of teeth on each first sprocket; and Two chains, one of which is fitted onto the two first sprockets and connected to the moving part; the other chain is fitted onto the two second sprockets and connected to the positioning seat; When the first rotating motor drives the first sprocket to rotate, the second sprocket rotates synchronously. The two chains respectively drive the alignment seat and the moving member to move, and the moving distance of the alignment seat is half the moving distance of the moving member, so that the alignment seat is in the middle position between the moving member and the fixed member.

5. The cable sag characteristic experimental apparatus as described in claim 2, characterized in that, The sag monitoring component includes: A lifting seat is slidably connected to the alignment seat in the vertical direction and is driven by a lifting drive mechanism; a marking strip is provided on the lifting seat, and the marking strip is arranged horizontally side by side at the drooping part of the cable segment to be tested as the lifting seat moves; and A marking component is disposed on the lifting base and is used to move with the lifting base to be located on both sides of the cable segment to be tested, respectively, from the marking strip. The marking member is used to spray marking medium toward the marking strip so that the surface of the marking strip forms a marking pattern that reflects the partial outline of the cable segment to be tested.

6. The cable sag characteristic test apparatus as described in claim 5, characterized in that, The marking strip is made of a flexible material, and the lifting base is also provided with a switching component that connects to the marking strip; the switching component includes: Two rotating rollers are respectively connected to both ends of the marking strip, and the two ends of the marking strip are respectively wound around the two rotating rollers; each rotating roller is rotatably connected to the lifting seat, and the rotation axis of each rotating roller is parallel to the vertical direction; and A second rotating motor is mounted on the lifting seat, and its output shaft is connected to one of the rotating rollers via a transmission. When the second rotating motor drives the rotating roller to rotate, the rotating roller can provide tension to the marking strip so that the marking strip is wrapped around the rotating roller; at the same time, another rotating roller rotates synchronously under the action of the marking strip to release the marking strip.

7. The cable sag characteristic test apparatus as described in claim 5, characterized in that, The marking component includes: A nozzle is mounted on the lifting base, and the nozzle is arranged side by side with the marking strip; the discharge port of the nozzle is oriented towards the marking strip; and A feeding component is mounted on the lifting base and communicates with the nozzle. The feeding component is used to store and pump the marking medium; when the feeding component is activated, the nozzle can spray the marking medium toward the marking strip.

8. The cable sag characteristic test apparatus as described in claim 1, characterized in that, The locking component includes: A tray, horizontally mounted on the movable member, is used to support the cable and allows the cable to slide relative to the tray as it moves; and A pressure plate is slidably connected to the moving member in the vertical direction and is located above the support plate; the pressure plate is driven by a linear drive member, which is used to drive the pressure plate to move toward or away from the support plate; When the linear drive member moves the pressure plate toward the support plate, the pressure plate and the support plate are adapted to clamp the upper and lower sides of the cable to fix the cable to the moving member.

9. The cable sag characteristic test apparatus as described in claim 1, characterized in that, The winding assembly includes: A take-up roller, rotatably mounted outside the moving part and connected to the end of the cable, is used to wind up or unwind the cable; and The third rotating motor has its power output shaft connected to the winding roller so that the winding roller rotates around its own axis. A tension sensor is provided between the take-up roller and the moving part, and the tension sensor is used to connect to the cable; when the locking member is separated from the cable, the tension sensor can measure the tension of the cable between the take-up roller and the fixing member.

10. A method for testing the sag characteristics of cables, based on the cable sag characteristic testing apparatus according to any one of claims 1-9, characterized in that, Includes the following steps: A. Connect one end of the cable to the fixing member, and wind the other end onto the winding assembly; The cable located between the fixing member and the winding assembly is connected to the moving member via the locking member to form a cable segment to be tested located between the fixing member and the moving member; B. Control the locking component to separate from the cable; Activate the winding assembly to wind up or release the cable, while simultaneously intervening manually to ensure that the cable segment under test reaches a preset length; C. Control the locking component to connect the moving part to the cable; Adjust the movable component to move it to abut against the fixed component, forming the sealed cavity; simultaneously, manually intervene to allow the cable segment to be tested to enter the sealed cavity; D. Turn on the heating component to heat the sealed cavity, so that the cable segment under test reaches the preset temperature; E. Adjust the moving part to move away from the fixed part, so that the distance between the moving part and the fixed part reaches the preset distance, and so that the cable segment to be tested reaches the preset stress synchronously; D. Record the sag curve and morphological data of the cable segment under test in real time at the current temperature; E. Repeat steps B to D to obtain multiple sets of cable sag characteristic data under different parameter conditions.

Images