Macromolecule cable strength detection device

Abstract

The invention relates to the technical field of macromolecule cable detection, and discloses a macromolecule cable strength detection device which comprises a detection table and further comprises a support fixedly connected to the bottom of the detection table and used for supporting the detection table; the winding mechanism is arranged on one side of the upper portion of the detection table and used for winding the cable; the intermittent tensioning mechanism is arranged on the other side of the detection table and used for fixing the cable to cooperate with the winding mechanism to perform tensioning detection on the cable; and the fixed plate is fixedly connected to the inner wall of the detection table and is used for dividing the detection table into two cavities. According to the invention, through eccentric rotation of the elliptical tensioning turntable, axial pulse tension which changes periodically is applied to the cable, intermittent high load caused by sea waves and sudden change of load is simulated, and meanwhile, through up-down reciprocating motion of the shifting sleeve which is synchronously linked, periodic transverse shifting force and bending stress are applied to the cable, so that the cable is tensioned. And the working condition of friction collision with a ship body and a fairlead is simulated.

Description

A polymer cable strength testing device Technical Field

[0001] This invention relates to the field of polymer cable testing technology, specifically to a polymer cable strength testing device. Background Technology

[0002] Polymer cables, such as ultra-high molecular weight polyethylene (UHMWPE) ropes, polyester ropes, and nylon ropes, are widely used in marine engineering, ship mooring, deep-sea aquaculture, aerospace, and emergency rescue due to their excellent properties such as light weight, high strength, corrosion resistance, and good flexibility. Their mechanical properties, especially fatigue strength, impact resistance, and structural integrity under long-term dynamic loads, are directly related to the safety and reliability of the entire operating system. Therefore, it is crucial to conduct strength testing of polymer cables under simulated real working conditions in product development, quality control, and service life assessment.

[0003] Currently, the mechanical performance testing of cables mainly relies on the following types of equipment and methods, but they all have certain limitations: Static tensile testing machines. These machines can perform precise static performance tests such as tensile strength and elongation at break. However, their loading method is slow, continuous constant speed or constant load tension, which cannot simulate the dynamic, intermittent, and impact loads that cables bear in actual use. For example, mooring cables bear periodically changing tension in wind and waves, which is completely different from the stress state of static tension. This leads to the problem that the test results cannot accurately predict the dynamic life and fatigue resistance of the cable. Therefore, a polymer cable strength testing device is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a polymer cable strength testing device to address the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a polymer cable strength testing device, including a testing platform, and further including: a bracket, fixedly connected to the bottom of the testing platform for supporting the testing platform; a winding mechanism, disposed on one side above the testing platform for winding the cable; an intermittent tensioning mechanism, disposed on the other side of the testing platform for fixing the cable and cooperating with the winding mechanism to test the cable tension; a fixing plate, fixedly connected to the inner wall of the testing platform for dividing the testing platform into two cavities; wherein, the intermittent tensioning mechanism includes: a reciprocating screw, rotatably connected to the bottom of the fixing plate through a bearing, with the top of the reciprocating screw moving upward and extending upward through the fixing plate, and the bottom of the reciprocating screw moving downward and extending downward through the bottom of the testing platform; a tensioning turntable, fixedly connected to the top of the reciprocating screw, with the cable sleeved on the outer wall of the tensioning turntable for fixing the pull rope; a motor, installed at the bottom of the testing platform, with the motor output end connected to the bottom extension end of the reciprocating screw for driving the reciprocating screw connection for driving the reciprocating screw to rotate.

[0006] Preferably, the cross-section of the tensioning turntable is elliptical, and the reciprocating screw is used to intermittently tension the cable for detection when rotating.

[0007] Preferably, the intermittent tensioning mechanism further includes: two movable columns, movably connected to the fixed plate and disposed on the front and rear sides of the cable; a lever sleeve, fixedly connected to the top of the two movable columns, and a connecting plate fixedly connected to the bottom of the two movable columns, the lever sleeve being used to move the cable up and down; two springs, respectively sleeved on the outer wall of the two movable columns and located between the fixed plate and the lever sleeve; a ball bearing slider, installed on the outer wall of the reciprocating screw and moving up and down, and a synchronizing rod fixedly connected between the ball bearing slider and the connecting plate, for synchronously driving the connecting plate to move up and down. Preferably, the winding mechanism includes: two mounting brackets, respectively fixedly connected to the front and back of the testing platform; two bearing seats, respectively installed on the two mounting brackets; a rotating shaft, installed on the two bearing seats and rotating, and a winding drum installed on the outer wall of the rotating shaft, for fixing the cable and winding the cable.

[0008] Preferably, the fixing plate is provided with multiple protective mechanisms, and the cable passes through multiple protective mechanisms for protection. The protective mechanism includes multiple protective sleeves, which are respectively equidistantly sleeved on the outer wall of the cable for protection.

[0009] Preferably, the protective mechanism further includes: multiple sliding holes equally spaced on the fixed plate; multiple sliders slidably connected to the inner walls of the sliding holes; and multiple fixed posts fixedly connected to the tops of the sliders, with a sliding sleeve slidably connected to the outer wall of each fixed post, and the top of the sliding sleeve connected to the protective sleeve.

[0010] Preferably, each of the sliding sleeves is provided with a second spring on its outer wall, and the two ends of the second spring are respectively connected to the protective sleeve and the slider.

[0011] Preferably, the actuating sleeve is rectangular and is fitted onto the outer wall of the cable, and the outer wall of the actuating sleeve is arc-shaped.

[0012] The present invention adopts the above technical solution and can bring the following beneficial effects: 1. The polymer cable strength testing device applies periodically changing axial pulse tension to the cable through the eccentric rotation of the elliptical tensioning turntable, simulating the intermittent high load caused by sudden changes in sea waves and load. At the same time, through the reciprocating motion of the synchronously linked actuating sleeve, periodic lateral actuating force and bending stress are applied to the cable, simulating the working conditions of friction and collision with the hull and cable guide hole.

[0013] 2. The polymer cable strength testing device forms multiple safety defenses through protective mechanisms set at intervals along the cable test section. Each protective sleeve forms a floating buffer structure through a sliding sleeve and a spring.

[0014] 3. When the cable bounces violently due to sudden tension changes or breakage, the protective sleeve can slide accordingly and use the spring to absorb and dissipate the impact energy, effectively limiting the lateral displacement of the cable and preventing it from being violently thrown out after breakage, causing damage to the equipment or posing a safety threat to the operator. This achieves passive safety protection throughout the testing process. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the structure of the present invention; Figure 2 is an enlarged schematic diagram of the structure at point A in Figure 1 of the present invention; Figure 3 is a cross-sectional schematic diagram of the present invention; Figure 4 is an enlarged schematic diagram of the structure at point B in Figure 3 of the present invention; Figure 5 is a front cross-sectional schematic diagram of the present invention; Figure 6 is a schematic diagram of the intermittent tensioning mechanism of the present invention.

[0016] In the diagram: 1. Testing table; 2. Support frame; 3. Winding mechanism; 31. Mounting frame; 32. Bearing seat; 33. Rotating shaft; 34. Winding drum; 4. Cable; 5. Intermittent tensioning mechanism; 51. Reciprocating screw; 52. Motor; 53. Tensioning turntable; 54. Ball bearing slider; 55. Synchronizing rod; 56. Connecting plate; 57. Actuating sleeve; 58. Movable column; 59. Spring 1; 6. Fixed plate; 7. Protective mechanism; 71. Sliding hole; 72. Sliding block; 73. Fixed column; 74. Sliding sleeve; 75. Protective sleeve; 76. Spring 2. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please refer to Figures 1-6. One embodiment of the present invention is as follows: a polymer cable strength testing device, including a testing platform 1, and further including: a bracket 2, fixedly connected to the bottom of the testing platform 1 for supporting the testing platform 1; a winding mechanism 3, disposed on one side above the testing platform 1 for winding a cable 4; an intermittent tensioning mechanism 5, disposed on the other side of the testing platform 1 for fixing the cable 4 and cooperating with the winding mechanism 3 to test the cable tension; and a fixing plate 6, fixedly connected to the inner wall of the testing platform 1 for dividing the testing platform 1 into two cavities; wherein, the intermittent tensioning mechanism 5 includes: a reciprocating... The lead screw 51 is rotatably connected to the bottom of the fixed plate 6 via a bearing. The top of the reciprocating lead screw 51 moves upward through the fixed plate 6 and extends upward, while the bottom of the reciprocating lead screw 51 moves downward through the bottom of the testing table 1 and extends downward. The tensioning turntable 53 is fixedly connected to the top of the reciprocating lead screw 51, and the cable 4 is sleeved on the outer wall of the tensioning turntable 53 for fixing the cable 4. The motor 52 is installed at the bottom of the testing table 1, and the output end of the motor 52 is connected to the bottom extension end of the reciprocating lead screw 51 for driving the reciprocating lead screw 51 to rotate.

[0019] The cross-section of the tensioning turntable 53 is elliptical, and the reciprocating screw 51 is used to intermittently tension the cable 4 for detection when it rotates.

[0020] The intermittent tensioning mechanism 5 further includes: two movable columns 58, movably connected to the fixed plate 6 and disposed on the front and rear sides of the cable 4; a lever sleeve 57, fixedly connected to the top of the two movable columns 58, and a connecting plate 56 fixedly connected to the bottom of the two movable columns 58, the lever sleeve 57 being used to move the cable 4 up and down; two springs 59, respectively sleeved on the outer wall of the two movable columns 58, and located between the fixed plate 6 and the lever sleeve 57; a ball block slider 54, installed on the outer wall of the reciprocating screw 51 and moving up and down, and a synchronizing rod 55 fixedly connected between the ball block slider 54 and the connecting plate 56, for synchronously driving the connecting plate 56 to move up and down. The winding mechanism 3 includes: two mounting brackets 31, respectively fixedly connected to the front and back of the detection table 1; two bearing seats 32, respectively installed on the two mounting brackets 31; a rotating shaft 33, installed on the two bearing seats 32 and rotating, and a winding drum 34 is installed on the outer wall of the rotating shaft 33, for fixing the cable 4 and winding the cable 4.

[0021] The fixed plate 6 is provided with multiple protective mechanisms 7, and the cable 4 passes through multiple protective mechanisms 7 for protection. The protective mechanism 7 includes multiple protective sleeves 75, which are equidistantly sleeved on the outer wall of the cable 4 for protection.

[0022] The protective mechanism 7 also includes: multiple sliding holes 71, which are equally spaced on the fixed plate 6; multiple sliders 72, which are slidably connected to the inner wall of the sliding holes 71; and multiple fixed posts 73, which are fixedly connected to the top of the sliders 72, and each fixed post 73 has a sliding sleeve 74 slidably connected to its outer wall, and the top of the sliding sleeve 74 is connected to the protective sleeve 75.

[0023] Each sliding sleeve 74 is fitted with a second spring 76 on its outer wall, and the two ends of the second spring 76 are connected to the protective sleeve 75 and the slider 72 respectively.

[0024] The actuating sleeve 57 is rectangular and is fitted onto the outer wall of the cable 4. The outer wall of the actuating sleeve 57 is arc-shaped.

[0025] Working principle: One end of the polymer cable 4 to be tested is fixed on the winding drum 34 of the winding mechanism 3. Then, the other end of the cable 4 is passed through the protective sleeves 75 of multiple protective mechanisms 7 in sequence, then around the actuating sleeve 57 on the intermittent tensioning mechanism 5, and then fixed on the tensioning turntable 53. The protective sleeve 75 is distributed along the test section of the cable, providing segmented protection. Then, the motor 52 is started, which drives the reciprocating screw 51 to rotate. Since the cross-section of the tensioning disc 53 is elliptical and fixedly installed at the top of the reciprocating screw 51, when the reciprocating screw 51 rotates, the tensioning disc 53 drives the cable 4 to rotate eccentrically around its axis. As the tensioning disc 53 rotates, its major axis radius and minor axis radius periodically alternately act on the cable 4. When the major axis radius contacts the cable, the cable is lifted, the path becomes longer, and the tension of the cable 4 is instantly increased on the basis tension provided by the winding mechanism 3. When the minor axis radius contacts the cable 4, the cable 4 is relaxed, and the tension decreases. This generates a periodic axial tensile load, simulating the intermittent high tension that the cable bears under working conditions such as wave fluctuations and sudden load changes.

[0026] Furthermore, the rotation of the reciprocating screw 51 simultaneously drives the ball block 54 on its outer wall to reciprocate linearly up and down along the reciprocating screw 51. The ball block 54 drives the connecting plate 56 to move up and down synchronously through the synchronizing rod 55. The connecting plate 56 drives the two movable columns 58 to slide up and down under the guidance of the fixed plate 6, thereby driving the top actuating sleeve 57 to reciprocate up and down synchronously. The actuating sleeve 57 is rectangular and its inner wall is fitted onto the cable 4. When it moves up and down, it applies a periodic lateral actuating force or bending stress perpendicular to its axis to the cable 4. This simulates the radial compression and bending fatigue generated by the cable rubbing, colliding, and slapping with the cable guide, hull, or other cables in actual use. When the actuating sleeve 57 moves up and down, it compresses or stretches the spring 59. The spring 59 plays a role in buffering and assisting in reset, making the actuating action smoother.

[0027] The rotating shaft 33 and the winding drum 34 of the winding mechanism 3 are driven by external power to slowly wind up the cable to meet testing needs or to retrieve the cable after testing.

[0028] Furthermore, the protective mechanism 7 provides safety throughout the testing process. Each protective sleeve 75 is floatingly connected to the fixed column 73 via a sliding sleeve 74 and a second spring 76. When the cable 4 experiences violent jumping due to tension or breakage, the protective sleeve 75 can slide and compress the second spring 76 to absorb the impact energy, effectively limiting the lateral displacement of the cable and preventing it from being thrown out after breakage or causing secondary damage to the equipment. The motor 52 runs continuously, causing the rotation of the elliptical tensioning turntable 53 and the up-and-down reciprocating motion of the actuating sleeve 57 to generate radial disturbance, which occurs synchronously and periodically. The cable 4 continues to work under this combined and intermittent stress until the predetermined test cycle is reached, or the cable breaks due to fatigue accumulation. After the test, the motor 52 stops working, and the winding mechanism 3 can be operated as needed to retrieve the unbroken cable or clean up the broken cable.

[0029] This invention provides a polymer cable strength testing device. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. A polymer cable strength testing device, comprising a testing platform (1), characterized in that, Also includes: A bracket (2) is fixedly connected to the bottom of the testing platform (1) to support the testing platform (1); a winding mechanism (3) is located on one side above the testing platform (1) to wind up the cable (4); an intermittent tensioning mechanism (5) is located on the other side of the testing platform (1) to fix the cable (4) and cooperate with the winding mechanism (3) to test the cable tension; a fixing plate (6) is fixedly connected to the inner wall of the testing platform (1) to divide the testing platform (1) into two cavities; wherein, the intermittent tensioning mechanism (5) includes: a reciprocating screw (51) rotatably connected to the bottom of the fixing plate (6) through a bearing. The top of the reciprocating screw (51) moves upward through the fixed plate (6) and extends upward, while the bottom of the reciprocating screw (51) moves downward through the bottom of the testing table (1) and extends downward. The tensioning turntable (53) is fixedly connected to the top of the reciprocating screw (51), and the cable (4) is sleeved on the outer wall of the tensioning turntable (53) for fixing the pull rope (4). The motor (52) is installed at the bottom of the testing table (1), and the output end of the motor (52) is connected to the bottom extension end of the reciprocating screw (51) for driving the reciprocating screw (51) to rotate.

2. The polymer cable strength testing device according to claim 1, characterized in that: The cross-section of the tensioning turntable (53) is elliptical, and the reciprocating screw (51) is used to intermittently tension the cable (4) for detection when it rotates.

3. The polymer cable strength testing device according to claim 2, characterized in that: The intermittent tensioning mechanism (5) further includes: two movable columns (58), which are movably connected to the fixed plate (6) and set on the front and rear sides of the cable (4); a lever sleeve (57), which is fixedly connected to the top of the two movable columns (58), and a connecting plate (56) is fixedly connected to the bottom of the two movable columns (58), and the lever sleeve (57) is used to move the cable (4) up and down; two springs (59), which are respectively sleeved on the outer wall of the two movable columns (58) and located between the fixed plate (6) and the lever sleeve (57); a ball slider (54), which is installed on the outer wall of the reciprocating screw (51) and moves up and down, and a synchronizing rod (55) is fixedly connected between the ball slider (54) and the connecting plate (56) for synchronously driving the connecting plate (56) to move up and down.

4. The polymer cable strength testing device according to claim 3, characterized in that: The winding mechanism (3) includes: two mounting brackets (31), which are fixedly connected to the front and back of the testing table (1) respectively; two bearing seats (32), which are installed on the two mounting brackets (31) respectively; a rotating shaft (33), which is installed on the two bearing seats (32) and rotates, and a winding drum (34) is installed on the outer wall of the rotating shaft (33) for fixing the cable (4) and winding the cable (4).

5. The polymer cable strength testing device according to claim 4, characterized in that: The fixing plate (6) is provided with multiple protective mechanisms (7), and the cable (4) passes through multiple protective mechanisms (7) for protection. The protective mechanism (7) includes multiple protective sleeves (75), which are respectively equidistantly sleeved on the outer wall of the cable (4) for protecting the cable (4).

6. The polymer cable strength testing device according to claim 5, characterized in that: The protective mechanism (7) further includes: multiple sliding holes (71) equally spaced on the fixed plate (6); multiple sliders (72) slidably connected to the inner wall of the sliding holes (71); multiple fixed posts (73) fixedly connected to the top of the sliders (72), and each fixed post (73) has a sliding sleeve (74) slidably connected to the outer wall of the outer wall, and the top of the sliding sleeve (74) is connected to the protective sleeve (75).

7. The polymer cable strength testing device according to claim 6, characterized in that: Each of the sliding sleeves (74) is fitted with a second spring (76) on its outer wall, and the two ends of the second spring (76) are respectively connected to the protective sleeve (75) and the slider (72).

8. The polymer cable strength testing device according to claim 7, characterized in that: The actuating sleeve (57) is rectangular and is fitted onto the outer wall of the cable (4). The outer wall of the actuating sleeve (57) is arc-shaped.

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