A life testing device for elevator cables

Abstract

This utility model discloses a life testing device for elevator cables, relating to the field of cable testing technology. It includes a frame and a cable. The frame is equipped with testing components capable of detecting the cable's lifespan. Automatic cable unwinding and rewinding are achieved through a drive mechanism. Combined with rollers, unwinding rollers, and rewinding rollers, the cable undergoes repeated bending and straightening fatigue cycles during testing. A rotary encoder combined with a PLC accurately records the number of cable bends, providing reliable data support for cable lifespan assessment. By adjusting the counterweight, the weight of the lifting frame can be flexibly changed to simulate the elevator cable's operating state under various load conditions, including no-load, half-load, full-load, and even overload.

Description

Technical Field

[0001] This utility model relates to the field of cable testing technology, and in particular to a life testing device for elevator cables. Background Technology

[0002] With the release and implementation of standards such as the "Standard for Electrical Design of Civil Buildings" GB 51348-2019, it is clearly stipulated that Class I buildings such as high-rise buildings, underground shopping malls, subway stations, medical, cultural, and entertainment venues must use low-smoke halogen-free cables with a B1-level combustion performance that meets GB31247.

[0003] However, existing elevator cables need to be tested to determine their lifespan. But traditional testing equipment can only be used under fixed conditions and cannot simulate the various complex conditions that elevator cables face in actual applications, such as different loads and different bending radii. This results in a large gap between the test results and the actual usage conditions, making it difficult to accurately assess the true lifespan of the cable. Utility Model Content

[0004] The purpose of this invention is to provide a life testing device for elevator cables in order to solve the problem that traditional testing equipment can usually only perform tests under fixed working conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An elevator cable life testing device includes a frame and a cable, wherein the frame is equipped with a testing component capable of testing the lifespan of the cable. The detection assembly includes guide rails symmetrically mounted on the frame, a lifting frame slidably connected between the two guide rails, rollers symmetrically mounted on the top of the lifting frame, an unwinding roller and a winding roller rotatably connected to the top of the frame, a drive component capable of driving the unwinding roller and the winding roller to rotate and wind up and down the cable at the top of the frame, a moving component capable of adjusting the curvature of the cable during lifting and lowering on the guide rails, and a counterweight component capable of adjusting the weight of the lifting frame during lifting and lowering on the frame.

[0006] As a further description of the above technical solution: The drive component includes a first motor fixedly mounted on the top of the frame, and gears are fixedly connected to one end of both the unwinding roller and the winding roller, with a synchronous belt meshing between the two gears.

[0007] As a further description of the above technical solution: One end of the unwinding roller is fixedly mounted on the output end of the first motor, the roller is rotatably mounted on the lifting frame, the cable passes through the two rollers in sequence, and the two ends of the cable are respectively wound around the unwinding roller and the take-up roller.

[0008] As a further description of the above technical solution: The moving component includes a mounting bracket fixedly installed between two guide rails. A second motor is fixedly installed on one side of the mounting bracket. A positive and negative threaded rod is fixedly connected to the output end of the second motor. A slider is threaded to both sides of the positive and negative threaded rod. A first roller is rotatably connected to one side of the slider. A second roller is symmetrically installed at the bottom end of the mounting bracket.

[0009] As a further description of the above technical solution: The positive and negative threaded screws are rotatably mounted on the mounting frame, and the first roller and the second roller are staggered, with the second roller rotatably mounted on the mounting frame.

[0010] As a further description of the above technical solution: The counterweight assembly includes a counterweight block placed on one side of the frame, a fixed frame is fixedly installed on the frame, a frame and a pressure sensor are fixedly installed on the lifting frame, and a rectangular plate is placed at the bottom of the lifting frame.

[0011] As a further description of the above technical solution: The fixed frame is located below the lifting frame, and a protrusion is fixedly installed on the top of the fixed frame, and the size of the protrusion is adapted to the size of the through hole opened on the rectangular plate.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: The automatic cable winding and unwinding is achieved through drive components. Combined with rollers, unwinding rollers, and rewinding rollers, the cable undergoes repeated bending and straightening fatigue cycles during testing. A rotary encoder integrated with a PLC accurately records the number of cable bends, providing reliable data support for cable life assessment. Adjusting the counterweight allows for flexible changes in the weight of the lifting frame, simulating the operation of elevator cables under various load conditions, including no-load, half-load, full-load, and even overload. Simultaneously, changing the distance between the first and second rollers using moving components increases or decreases the cable's bending degree, simulating different bending radii. By changing the load and bending degree in real time, the cable's performance changes can be dynamically observed, such as the dynamic response of performance indicators like tensile strength, flexibility, and insulation resistance under different loads and bending radii. Attached Figure Description

[0013] Figure 1 An overall schematic diagram according to an embodiment of the present utility model is shown; Figure 2 The present invention provides an embodiment of the present invention. Figure 1 Another perspective view; Figure 3 A schematic diagram of a detection component provided according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of a drive component according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of a movable component according to an embodiment of the present invention is shown; Figure 6 A diagram showing the positional relationship between the slider and the first roller according to an embodiment of the present invention is provided. Figure 7 A schematic diagram of a counterweight assembly provided according to an embodiment of the present invention is shown; Figure 8 A diagram showing the positional relationship between the lifting frame and the rectangular plate according to an embodiment of the present invention is provided.

[0014] Legend: 10. Rack; 11. Cable; 20. Detection component; 21. Guide rail; 22. Lifting frame; 23. Roller; 24. Unwinding roller; 25. Rewinding roller; 26. Drive component; 261. First motor; 262. Gear; 263. Synchronous belt; 30. Moving component; 31. Mounting bracket; 32. Second motor; 33. Positive and negative threaded screws; 34. Slider; 35. First roller; 36. Second roller; 40. Counterweight assembly; 41. Counterweight block; 42. Fixing bracket; 43. Frame; 44. Pressure sensor; 45. Rectangular plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figures 1-8 As shown, the present invention provides an elevator cable life testing device, which includes a frame 10 and a cable 11. The frame 10 is equipped with a testing component 20 that can test the life of the cable 11. The detection component 20 includes guide rails 21 symmetrically mounted on the frame 10. A lifting frame 22 is slidably connected between the two guide rails 21. The lifting frame 22 is kept stable by the guide rails 21 on both sides during lifting. Rollers 23 are symmetrically mounted on the top of the lifting frame 22. An unwinding roller 24 and a winding roller 25 are rotatably connected to the top of the frame 10. A drive component 26 is installed on the top of the frame 10, which can drive the unwinding roller 24 and the winding roller 25 to rotate and wind up and unwind the cable 11. A moving component 30 is installed on the guide rails 21, which can adjust the curvature of the cable 11 during lifting. A counterweight component 40 is installed on the frame 10, which can adjust the weight of the lifting frame 22 during lifting.

[0017] like Figures 3-4 As shown, the drive unit 26 includes a first motor 261 fixedly mounted on the top of the frame 10. One end of the unwinding roller 24 and the take-up roller 25 are fixedly connected to a gear 262. A synchronous belt 263 meshes between the two gears 262. When the unwinding roller 24 starts to rotate counterclockwise, the take-up roller 25 also starts to rotate counterclockwise through the meshing transmission of the gears 262 and the synchronous belt 263. At this time, the unwinding roller 24 winds up the cable 11, and the take-up roller 25 unwinds the cable 11. When the unwinding roller 24 and the take-up roller 25 rotate clockwise, the unwinding roller 24 unwinds the cable 11, and the take-up roller 25 takes the cable 11 back up.

[0018] In more detail, one end of the unwinding roller 24 is fixedly installed on the output end of the first motor 261. The first motor 261 can drive the unwinding roller 24 to rotate. The roller 23 is rotatably installed on the lifting frame 22. The cable 11 passes through the two rollers 23 in sequence, and the two ends of the cable 11 are respectively wound around the unwinding roller 24 and the take-up roller 25. When testing the service life of cable 11, the device simulates the lifting and lowering of an elevator. First, cable 11 is passed between two rollers 23. Then, the two ends of cable 11 are respectively wound and connected to unwinding roller 24 and winding roller 25. At this time, the first motor 261 is started to drive unwinding roller 24 to start rotating counterclockwise. Through the meshing transmission of gear 262 and synchronous belt 263, winding roller 25 also starts to rotate counterclockwise. At this time, unwinding roller 24 winds up cable 11, and winding roller 25 unwinds cable 11, thereby enabling the lifting frame 22 to be pulled up. Next, the first motor 261 drives the unwinding roller 24 to rotate clockwise. Through the meshing transmission of the synchronous belt 263, the winding roller 25 also rotates clockwise, so that the unwinding roller 24 unwinds the cable 11 and the winding roller 25 winds up the cable 11, thereby allowing the lifting frame 22 to descend, and so on. When the cable 11 is being wound up and unwound, it will be wrapped around the surface of the unwinding roller 24 and the winding roller 25, causing the cable 11 to repeatedly undergo bending and straightening processes. Each bending and straightening can be regarded as a fatigue cycle. At the same time, the number of bends that the cable 11 can withstand before showing signs of failure such as damage, breakage or deterioration of electrical performance is recorded. Generally speaking, the more bends, the longer the life of the cable 11. For example, if an elevator cable 11 has undergone 100,000 bending cycles on the testing device and its surface shows obvious wear and exposed core, then it can be preliminarily determined that the bending life of the cable 11 is about 100,000 cycles. Meanwhile, both the unwinding roller 24 and the take-up roller 25 are equipped with existing rotary encoders combined with PLC recording. The encoders generate pulse signals as the unwinding roller 24 and the take-up roller 25 rotate. Each pulse signal corresponds to a certain rotation angle. By counting the number of pulses, the number of rotations of the unwinding roller 24 and the take-up roller 25 can be accurately calculated, thereby obtaining the number of bends of the cable 11. The rotary encoder is then connected to the programmable logic controller (PLC), which can acquire and count the encoder's pulse signals in real time.

[0019] like Figures 5-6 As shown, the moving component 30 includes a mounting bracket 31 fixedly installed between two guide rails 21. A second motor 32 is fixedly installed on one side of the mounting bracket 31. A positive and negative threaded rod 33 is fixedly connected to the output end of the second motor 32. The second motor 32 can drive the positive and negative threaded rod 33 to rotate in the forward or reverse direction. Slider 34 is threadedly connected to both sides of the positive and negative threaded rod 33. By rotating the positive and negative threaded rod 33 in the forward and reverse directions, the two sliders 34 can move towards opposite or opposite directions. A first roller 35 is rotatably connected to one side of the slider 34. The slider 34 drives the first roller 35 to move. A second roller 36 is symmetrically installed at the bottom end of the mounting bracket 31.

[0020] In more detail, the positive and negative threaded rods 33 are rotatably mounted on the mounting bracket 31, the first roller 35 and the second roller 36 are staggered, and the second roller 36 is rotatably mounted on the mounting bracket 31; like Figure 5 As shown, cable 11 is located between the first roller 35 and the second roller 36. When it is necessary to increase the bending degree of cable 11 during testing, the second motor 32 is started. The second motor 32 can drive the forward and reverse threaded rods 33 to rotate, so that the slider 34 drives the first roller 35 to move, thereby causing the two first rollers 35 to move in opposite directions. While the first rollers 35 are moving, the cable 11 is also pushed, causing the cable 11 to bend at the first roller 35 and the second roller 36. By adjusting the distance between the two first rollers 35, the bending degree of cable 11 can be increased or decreased. During the actual operation of the elevator, the bending radius of the cable 11 is not fixed, but changes dynamically with factors such as the position and operating status of the car. By adjusting the distance between the two first rollers 35, this dynamic working condition can be simulated, which can more realistically reflect the stress and wear of the cable 11 in actual use, thereby comprehensively evaluating the performance and life of the cable 11. Different elevators have different shaft dimensions, car suspension methods, and cable 11 layouts. By adjusting the distance between the two first rollers 35 to change the curvature, the actual bending conditions of cables 11 in various elevator models can be simulated, making the test results more targeted and representative.

[0021] like Figures 7-8 As shown, the counterweight assembly 40 includes a counterweight block 41 placed on one side of the frame 10. A fixed frame 42 is fixedly installed on the frame 10. A frame 43 and a pressure sensor 44 are fixedly installed on the lifting frame 22. The frame 43 can protect the counterweight block 41 and prevent it from slipping when the lifting frame 22 rises. The pressure sensor 44 is existing technology and its model is 4G / NB-IoT wireless. A rectangular plate 45 is placed at the bottom of the lifting frame 22.

[0022] In more detail, the fixing frame 42 is located below the lifting frame 22, and a protrusion is fixedly installed on the top of the fixing frame 42, and the size of the protrusion is adapted to the size of the through hole opened on the rectangular plate 45. In use, by placing the counterweight 41 on the lifting frame 22 and placing it inside the frame 43, the weight of the lifting frame 22 during lifting can be increased. The pressure sensor 44 on one side can display the detected pressure. By increasing or decreasing the counterweight 41, the lifting frame 22 can simulate the operation of an elevator car carrying passengers. Increasing the weight of the lifting frame 22 can simulate the stress on the cable 11 when the elevator is fully loaded; reducing the weight can simulate the working conditions under no-load or light-load conditions, making the test results closer to various load conditions in actual use. The fatigue life of cable 11 varies under different tensile forces. Increasing the weight of the lifting frame 22 can increase the tensile force on cable 11, thereby accelerating the testing process and quickly evaluating the life of cable 11 under greater tensile forces; conversely, reducing the weight can test the life performance of cable 11 under smaller tensile forces and understand the performance variation law of cable 11 in different tensile force ranges. If it is necessary to remove the counterweight 41, simply continue to lower the lifting frame 22 so that the through hole on the rectangular plate 45 engages with the protrusion at the top of the fixing frame 42. As the lifting frame 22 lowers, the fixing frame 42 can lift the rectangular plate 45, thus making it easy to remove the counterweight 41 from the frame 43.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A life testing device for elevator cables, comprising a frame (10) and a cable (11), characterized in that, Also includes: The frame (10) is equipped with a detection component (20) capable of detecting the service life of the cable (11). The detection component (20) includes guide rails (21) symmetrically mounted on the frame (10), a lifting frame (22) slidably connected between the two guide rails (21), rollers (23) symmetrically mounted on the top of the lifting frame (22), an unwinding roller (24) and a winding roller (25) rotatably connected to the top of the frame (10), a drive component (26) capable of driving the unwinding roller (24) and the winding roller (25) to rotate and wind up and unwind the cable (11) at the top of the frame (10), a moving component (30) capable of adjusting the curvature of the cable (11) during lifting and lowering is mounted on the guide rails (21), and a counterweight component (40) capable of adjusting the weight of the lifting frame (22) during lifting and lowering is mounted on the frame (10).

2. The elevator cable life testing device according to claim 1, characterized in that, The drive component (26) includes a first motor (261) fixedly installed at the top of the frame (10), and a gear (262) is fixedly connected to one end of the unwinding roller (24) and the winding roller (25), and a synchronous belt (263) meshes between the two gears (262).

3. The elevator cable life testing device according to claim 2, characterized in that, One end of the unwinding roller (24) is fixedly installed on the output end of the first motor (261), the roller (23) is rotatably installed on the lifting frame (22), the cable (11) passes through the two rollers (23) in sequence, and the two ends of the cable (11) are respectively wound on the unwinding roller (24) and the winding roller (25).

4. The elevator cable life testing device according to claim 1, characterized in that, The moving component (30) includes a mounting bracket (31) fixedly installed between two guide rails (21). A second motor (32) is fixedly installed on one side of the mounting bracket (31). A positive and negative threaded rod (33) is fixedly connected to the output end of the second motor (32). A slider (34) is threadedly connected to both sides of the positive and negative threaded rod (33). A first roller (35) is rotatably connected to one side of the slider (34). A second roller (36) is symmetrically installed at the bottom end of the mounting bracket (31).

5. The elevator cable life testing device according to claim 4, characterized in that, The positive and negative threaded rods (33) are rotatably mounted on the mounting frame (31), the first roller (35) and the second roller (36) are staggered, and the second roller (36) is rotatably mounted on the mounting frame (31).

6. The elevator cable life testing device according to claim 1, characterized in that, The counterweight assembly (40) includes a counterweight block (41) placed on one side of the frame (10), a fixed frame (42) is fixedly installed on the frame (10), a frame (43) and a pressure sensor (44) are fixedly installed on the lifting frame (22), and a rectangular plate (45) is placed at the bottom of the lifting frame (22).

7. The elevator cable life testing device according to claim 6, characterized in that, The fixed frame (42) is located below the lifting frame (22). A protrusion is fixedly installed on the top of the fixed frame (42), and the size of the protrusion is adapted to the size of the through hole opened on the rectangular plate (45).

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