A marine steel wire rope detection device

Abstract

The application belongs to the technical field of steel wire rope detection, and specifically discloses a marine steel wire rope detection device, which comprises a needle bearing and a rotating drum rotatably arranged in the needle bearing, further comprises a variable-pitch adjusting mechanism symmetrically arranged in the rotating drum, a radial synchronous adapting mechanism symmetrically arranged outside the rotating drum, and an external gear ring threadedly arranged at the front end of the rotating drum, each variable-pitch adjusting mechanism comprises a plurality of universal bull's eye wheels arranged along the axial direction of the rotating drum, and a distance measuring sensor for detecting the relative position change between the adjacent universal bull's eye wheels is arranged between the adjacent universal bull's eye wheels. The radial synchronous adapting mechanism is used for pressing the bull's eye wheels into the grooves between the strands of the steel wire rope, and through the axial relative movement between the device and the steel wire rope, each bull's eye wheel is limited by the support of the needle bearing and rotates adaptively along the spiral track of the groove between the strands, and any uneven change of the gap between the strands will be directly converted into the measurable relative displacement of the bull's eye wheel in the axial position, so that the automatic detection of the lay length parameter is realized.

Description

Technical Field

[0001] This invention belongs to the field of steel wire rope testing technology, specifically referring to a marine steel wire rope testing device. Background Technology

[0002] Offshore wire ropes, as key load-bearing and transmission components in the field of marine engineering, are widely used in core equipment such as offshore drilling platforms, crane vessels, mooring systems, towing equipment, and deep-sea exploration cables. These devices typically operate in harsh environments with high salt spray, high humidity, strong corrosion, and alternating loads year-round, placing extremely stringent requirements on the structural integrity, safety, and reliability of the wire ropes. Therefore, factory testing of offshore wire ropes is a necessary prerequisite for ensuring safe operations in marine engineering. The testing of wire ropes typically includes both external and internal components. Among these, the lay pitch, as one of the most basic and important geometric parameters of the wire rope, directly reflects potential defects that may occur during production.

[0003] In existing technologies, there are two main methods for detecting the lay distance of steel wire ropes: the first is the traditional contact imprinting method, which involves rubbing and imprinting the surface of the steel wire rope with tools such as paper and lead powder to obtain the imprint of the strands, and then manually measuring the imprint; the second is the direct measurement method using manual visual inspection combined with tools such as calipers. However, both of these methods are inefficient, labor-intensive, difficult to automate and monitor online, and heavily rely on the experience and subjective judgment of the operators, making it difficult to guarantee measurement accuracy.

[0004] To overcome the shortcomings of manual inspection, researchers have attempted to introduce machine vision technology for non-contact automated inspection. However, they still face technical bottlenecks, the fundamental reason being the complex three-dimensional helical twisted structure of the wire rope itself. Because the gaps between the strands of the wire rope (i.e., inter-strand gaps) vary in width due to uneven stress during winding, optical imaging-based visual inspection systems suffer from severe optical shadows and localized highlights due to irregular reflections from oil and water films on the wire rope surface. This blurs the edge features of the strands, making it difficult to accurately determine these irregular inter-strand gaps. Furthermore, due to its helical structure, some strands can create localized occlusions, resulting in blind spots. These factors—optical shadows, visual occlusions, and image misalignment caused by shooting angles—combined make it difficult for existing image processing algorithms to accurately and stably extract strand boundaries, thus hindering the precise detection of inter-strand gaps and other twist parameters of the wire rope. Summary of the Invention

[0005] To address the above issues, this invention provides a marine steel wire rope testing device. It features multiple symmetrically distributed bullseye wheels, employing a pitch adjustment mechanism to adapt to different lay pitches. A radial synchronization mechanism presses the bullseye wheels into the interstrand grooves of the steel wire rope. Through axial relative movement between the device and the steel wire rope, each bullseye wheel, supported and limited by needle roller bearings, can adaptively rotate following the helical trajectory of the interstrand grooves. Any uneven changes in the interstrand gaps are directly converted into measurable relative displacement of the bullseye wheels in the axial position. This solves the problems of shadows and obstructions in optical detection, achieving high-precision, high-reliability automated detection of lay pitch-related parameters.

[0006] The technical solution adopted by the present invention is as follows: The present invention proposes a marine steel wire rope testing device, including a needle roller bearing and a rotating drum rotatably disposed in the needle roller bearing, and further including a pitch adjustment mechanism centrally symmetrically disposed in the rotating drum, a radial synchronization adaptation mechanism centrally symmetrically disposed outside the rotating drum, and an external gear ring threadedly sleeved on the front end of the rotating drum.

[0007] Furthermore, the radial synchronization adapter mechanism includes a rail fixed on the rotating drum, a rack radially slidable within the rail, a drive shaft arranged parallel to the axis of the rotating drum, and two gears at both ends of the drive shaft, wherein one gear meshes with the rack and the other gear meshes with the outer ring teeth of the outer gear ring.

[0008] Furthermore, the inner end of the rack passes through the rotating cylinder and is connected to the pitch adjustment mechanism.

[0009] Furthermore, each set of pitch adjustment mechanisms includes multiple omnidirectional bullseye wheels arranged along the axial direction of the drum, and a distance measuring sensor is provided between adjacent omnidirectional bullseye wheels to detect changes in their relative positions.

[0010] Furthermore, the pitch adjustment mechanism is configured in two groups, with the number of universal bullseye wheels on each group being half the number of strands of the steel wire rope to be tested.

[0011] Furthermore, the pitch adjustment mechanism also includes a roller frame connected to the inner end of the rack, a pitch cam rotatably disposed within the roller frame, a first guide rod fixed within the roller frame, and multiple sliders slidably disposed on the first guide rod. The outer peripheral surface of the pitch cam is provided with pitch grooves equal in number to the same side universal bullseye wheels, and each slider is provided with a roller that slides in cooperation with the pitch groove.

[0012] Furthermore, each slider has a bracket on the side away from the roller, and a second guide rod is fixed on the bracket. The axis of the second guide rod is parallel to the axis of the rotating drum. The universal bullseye wheel is slidably engaged on the second guide rod, and the universal bullseye wheel points to the central axis of the rotating drum. A return spring is sleeved on the second guide rod on both sides of the universal bullseye wheel, so that the universal bullseye wheel can automatically maintain the middle position of the second guide rod.

[0013] Furthermore, when the variable pitch cam rotates around its own axis, all the sliders that cooperate with the variable pitch groove translate synchronously on the first guide rod, and the distance between all adjacent sliders remains equal at any rotation position.

[0014] Furthermore, one end of the pitch adjustment mechanism is provided with a self-locking drive mechanism, which includes a worm gear fixed coaxially with the pitch cam and a worm meshing with the worm gear, thereby driving the pitch cam and self-locking it.

[0015] Furthermore, a pressure sensor is provided between the inner end of the rack and the roller frame to monitor the clamping pressure in real time.

[0016] Furthermore, a guide ring for guiding the wire rope is coaxially provided behind the needle roller bearing, and a constraint groove for fitting into the needle roller bearing is provided on the outer surface of the rear end of the drum.

[0017] Furthermore, both the rotating drum and the outer gear ring are provided with levers for applying relative rotation.

[0018] The beneficial effects achieved by the present invention using the above structure are as follows:

[0019] (1) This invention solves the technical bottlenecks of existing machine vision inspection methods, such as image shadows, local highlights and visual occlusion caused by factors such as the complex three-dimensional spiral structure of steel wire rope and surface oil stains. This device adopts an innovative mechanical contact measurement principle. Through a radial synchronous adaptation mechanism, multiple universal bullseye wheels are reliably pressed into the grooves between the strands of the steel wire rope. When the device and the steel wire rope move axially relative to each other, any uneven change in the gap between the strands will be directly and stably converted into the axial relative displacement of the universal bullseye wheels on the second guide rod, and then quantified with high precision by the distance sensor. This method cleverly converts the optical feature problem that is difficult to identify accurately into the mechanical displacement problem that is easy to measure, so as to achieve high precision and high reliability detection of the lay length related parameters.

[0020] (2) This invention overcomes the shortcomings of traditional manual inspection, such as low efficiency, high labor intensity and strong subjectivity of measurement results. By setting up a pitch adjustment mechanism, the operator can drive the self-locking drive mechanism to adjust the pitch cam, thereby changing the initial distance of each universal bullseye wheel at equal intervals, so as to quickly adapt to wire ropes with different lay pitch standards. Once the setting is completed, the inspection process can be carried out continuously and automatically. The universal bullseye wheel can adapt to the spiral trajectory of the inter-strand groove under the support of the needle roller bearing, without the need for manual intervention. This greatly improves the inspection efficiency and reduces the labor intensity. Attached Figure Description

[0021] Figure 1This is a first three-dimensional structural schematic diagram of a marine steel wire rope testing device proposed in this invention.

[0022] Figure 2 This is a second three-dimensional structural schematic diagram of a marine steel wire rope testing device proposed in this invention.

[0023] Figure 3 This is an exploded structural diagram showing the positional relationship between the rotating drum and the needle roller bearing of a marine steel wire rope testing device proposed in this invention.

[0024] Figure 4 for Figure 2 Enlarged view of section A in the middle.

[0025] Figure 5 This is an exploded structural diagram showing the positional relationship between the outer gear ring and the rotating drum of a marine steel wire rope testing device proposed in this invention.

[0026] Figure 6 This is a schematic diagram of the pitch adjustment mechanism of a marine steel wire rope detection device proposed in this invention.

[0027] Figure 7 This is a side view of the pitch adjustment mechanism of a marine steel wire rope testing device proposed in this invention.

[0028] Figure 8 This is a schematic diagram showing the positional relationship between the universal bullseye wheel and the support of a marine steel wire rope testing device proposed in this invention.

[0029] Figure 9 This is a schematic diagram of the variable-pitch cam in a marine steel wire rope detection device proposed in this invention.

[0030] Figure 10 This is a schematic diagram showing the positional relationship between the universal bullseye wheel and the wire rope in a marine steel wire rope testing device proposed in this invention.

[0031] Among them, 1. needle roller bearing, 11. guide ring, 2. rotating drum, 21. constraint groove, 3. radial synchronization adapter mechanism, 31. rail, 32. rack, 33. gear, 34. drive shaft, 4. external gear ring, 5. pressure sensor, 6. pitch adjustment mechanism, 61. roller frame, 62. pitch cam, 621. pitch groove, 63. first guide rod, 64. slider, 65. roller, 66. bracket, 67. second guide rod, 68. return spring, 69. universal bullseye wheel, 7. self-locking drive mechanism, 71. worm gear, 72. worm, 8. distance sensor, 9. lever.

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "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 this 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 this invention.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown, this invention proposes a marine steel wire rope testing device, including a needle roller bearing 1 serving as a base, and a rotating drum 2 rotatably disposed inside the needle roller bearing 1. To ensure that the rotating drum 2 can achieve free rotation with low friction within the needle roller bearing 1, while effectively limiting its axial position, a constraint groove 21 that fits into the needle roller bearing 1 is provided on the outer surface of the rear end of the rotating drum 2. Behind the needle roller bearing 1, a detachable guide ring 11 is coaxially provided, the inner diameter of which matches the nominal diameter of the steel wire rope to be tested, for precise coaxial guidance of the steel wire rope during the testing process.

[0036] The device also includes a radial synchronization adapter 3 centrally symmetrically disposed outside the rotating drum 2, and a pitch adjustment mechanism 6 centrally symmetrically disposed inside the rotating drum 2.

[0037] Specifically, the radial synchronization adapter 3 is used to radially press the detection component onto the surface of the wire rope. This mechanism includes a guide rail 31 fixed to the outer wall of the rotating drum 2, a rack 32 radially slidably disposed within the guide rail 31, and a drive shaft 34 parallel to the axis of the rotating drum 2. Gears 33 are fixed to both ends of the drive shaft 34, with one gear 33 meshing with the rack 32 and the other gear 33 meshing with the outer ring teeth of the outer gear ring 4 threaded onto the front end of the rotating drum 2. In this embodiment, two sets of radial synchronization adapters 3 are centrally symmetrically arranged. When the operator passes through the guide rail 31 on the rotating drum... The lever 9 on the outer side of the outer gear ring 4 causes the outer gear ring 4 to rotate relative to the rotating drum 2. The outer gear teeth of the outer gear ring 4 drive the gear 33 meshing with it to rotate. This rotation is synchronously transmitted to the gear 33 at the other end through the transmission shaft 34, thereby driving the rack 32 meshing with it to move radially. Since the two sets of radial synchronous adaptation mechanisms 3 are centrally symmetrically arranged, this design can ensure that the two racks 32 move synchronously and equidistantly toward or away from the central axis, realizing the synchronous clamping or loosening of the wire rope. The threaded connection between the rotating drum 2 and the outer gear ring 4 also has a self-locking function to ensure the position is fixed.

[0038] The inner end of the rack 32 passes through the cylinder wall of the rotating cylinder 2 and is connected to the pitch adjustment mechanism 6. In order to accurately control the clamping force and avoid excessive squeezing, a pressure sensor 5 is provided between the inner end of the rack 32 and the roller frame 61 of the pitch adjustment mechanism 6 for real-time monitoring and feedback of the clamping pressure.

[0039] The pitch adjustment mechanism 6 is the key to realizing the measurement of the pitch parameter. In this embodiment, two sets are also provided, corresponding one-to-one with the two sets of radial synchronous adaptation mechanisms 3. Each set of pitch adjustment mechanism 6 includes a roller frame 61 connected to the inner end of the rack 32. A pitch cam 62 is rotatably provided in the roller frame 61 and a first guide rod 63 is fixed thereon. Multiple sliders 64 are slidably sleeved on the first guide rod 63. A pitch groove 621 with a special curved profile is opened on the outer peripheral surface of the pitch cam 62. Each slider 64 is provided with a roller 65, which slides in cooperation with the pitch groove 621. The profile of the pitch groove 621 is precisely designed. Its key feature is that when the pitch cam 62 rotates around its own axis, all sliders 64 that cooperate with the pitch groove 621 will translate synchronously on the first guide rod 63. Moreover, at any rotation position, the distance between all adjacent sliders 64 remains equal, which ensures the equal and synchronous adjustment of the detection distance.

[0040] In order to achieve precise adjustment of the variable pitch cam 62 and reliably lock it after adjustment, a self-locking drive mechanism 7 is provided at one end of each variable pitch adjustment mechanism 6. The mechanism includes a worm wheel 71 fixed coaxially with the variable pitch cam 62 and a worm 72 meshing with the worm wheel 71. The operator can drive the worm 72 to precisely rotate the worm wheel 71, thereby driving the variable pitch cam 62 to rotate, so as to achieve fine adjustment of the distance between the sliders 64. After the adjustment is completed, the self-locking characteristics of the worm wheel 71 and the worm 72 can prevent the position from changing.

[0041] Each slider 64 has a bracket 66 on the side opposite to the roller 65. A second guide rod 67 is fixed on the bracket 66. The axis of the second guide rod 67 is parallel to the axis of the rotating drum 2 (i.e., the direction of the wire rope axis). The universal bullseye wheel 69 is slidably engaged on the second guide rod 67, and its rolling part points to the central axis of the rotating drum 2, that is, directly opposite the wire rope. A return spring 68 is sleeved on the second guide rod 67 on both sides of the universal bullseye wheel 69. The spring enables the universal bullseye wheel 69 to automatically maintain the middle position of the second guide rod 67 when it is not subjected to axial external force.

[0042] The number of universal bullseye pulleys 69 is related to the number of strands in the wire rope to be tested. For example, in this embodiment, for a wire rope made of 6 strands, the device is equipped with a total of 6 universal bullseye pulleys 69, that is, 3 are set on each set of pitch adjustment mechanism 6. This ensures that each universal bullseye pulley 69 can correspond to a strand groove, so as to realize the full length detection of all strands. Between two adjacent universal bullseye pulleys 69, a distance sensor 8 is provided for detecting the change of their relative position.

[0043] The omnidirectional bullseye wheel 69 is a special rolling component that enables unobstructed, multi-directional rolling. Its core consists of a large-diameter main ball bearing, multiple smaller balls supporting the main ball bearing, and a housing that contains all the balls. Most of the main ball bearing is exposed outside the housing. This design allows the main ball bearing to achieve 360-degree omnidirectional free rotation with minimal resistance. In this invention, when the main ball bearing of the omnidirectional bullseye wheel 69 is pressed into the spiral groove between the strands of the wire rope and moves with it, it can not only adapt to rolling along the axis of the wire rope, but also perfectly adapt to the lateral movement caused by the spiral trajectory of the groove, ensuring that it can smoothly and accurately track the spiral path of the groove without jamming.

[0044] The specific work process is as follows:

[0045] Preparation: First, select and install a matching guide ring 11 according to the diameter of the wire rope to be tested. Then, pass the wire rope through the entire device. According to the standard lay length parameters of this type of wire rope, the theoretical distance between the adjacent inter-strand grooves on both sides of a strand in the direction of the wire rope axis can be calculated in advance. The operator drives each self-locking drive mechanism 7 to rotate the worm 72, which drives the variable pitch cam 62 to rotate, thereby synchronously adjusting the position of all sliders 64 on the first guide rod 63, thereby changing the distance between each universal bullseye wheel 69. Through the real-time reading of the distance sensor 8, the distance is precisely adjusted to be equal to the theoretical calculation value. Then, the position is fixed by using the self-locking characteristics of the worm wheel 71 and worm 72.

[0046] Clamping and Self-Alignment: The operator uses one hand to fix the rotating drum 2 via the lever 9, and the other hand to rotate the outer gear ring 4. As mentioned earlier, this action drives the pitch adjustment mechanisms 6 on both sides to move radially towards the center of the wire rope through the radial synchronization adapter 3. Finally, all the universal bullseye pulleys 69 (6 in this embodiment) are pressed into the interstrand grooves on the surface of the wire rope. During this process, the device has excellent self-alignment capability. Since the strands of the wire rope are spirally distributed, the spiral line of the interstrand groove on one side of the wire rope and the spiral line on the other side have opposite directions of rotation relative to the universal bullseye pulleys 69. When the universal bullseye pulleys 69 on both sides are pressed down at the same time, they will be subjected to opposite forces from both sides. The opposing squeezing force of the spiral groove wall causes the universal bullseye wheel 69 to automatically slide into and stably lock into the deepest part of the groove, forming a self-constraining effect and preventing overall lateral slippage. Even if the initial position is slightly deviated axially, the universal bullseye wheel 69 will automatically slide into the groove under the guidance of the strand slope, and through the elastic action of the return spring 68, drive the entire rotating drum 2 and internal mechanism to make a slight axial floating, so that all universal bullseye wheels 69 are accurately locked into their respective inter-strand grooves. At this time, the reading of the pressure sensor 5 can help the operator apply a suitable preload force that can ensure reliable contact without jamming and preventing free movement.

[0047] Movement detection: After clamping, the device and the wire rope are moved axially relative to each other. This can be achieved by fixing the needle roller bearing 1 to the moving platform and moving it along the stationary wire rope, or by fixing the needle roller bearing 1 and letting the wire rope pass through the device. During the relative movement, since the universal bullseye wheels 69 are constrained in the spiral trajectory of the inter-strand groove, they will follow the trajectory and thus drive the entire rotating drum 2 to rotate automatically and synchronously within the needle roller bearing 1.

[0048] Defect Identification: During the mobile inspection process, if the wire rope twist is uniform and conforms to the standard, the relative positions of all the inter-strand grooves remain unchanged, and the axial distance between each universal bullseye wheel 69 also remains unchanged. The reading of the distance sensor 8 will remain at the initial calibration value. However, when a manufacturing defect is encountered, such as when the gap between two strands is too large, these two strands will act like wedges, squeezing the two universal bullseye wheels 69 in their outer grooves to both sides in the axial direction. This squeezing will overcome the elastic force of the return spring 68, causing the universal bullseye wheels 69 to undergo relative displacement on the second guide rod 67. This displacement will be captured instantly by the distance sensor 8, which will manifest as a significant change in the reading. By analyzing the signal output by the distance sensor 8, the abnormal twist at this position can be accurately detected. The system can issue an alarm, mark, or record the coordinates of the defect point, thereby achieving high-precision and automated detection of the twist parameters of the marine wire rope.

[0049] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

[0051] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A marine steel wire rope testing device, comprising a needle roller bearing (1) and a rotating drum (2) rotatably disposed within the needle roller bearing (1), characterized in that: It also includes two sets of pitch adjustment mechanisms (6) centrally symmetrically arranged inside the rotating drum (2), two sets of radial synchronous adaptation mechanisms (3) centrally symmetrically arranged outside the rotating drum (2), and an external gear ring (4) threaded onto the front end of the rotating drum (2); The radial synchronization adapter (3) includes a rail (31) fixed on the rotating drum (2), a rack (32) radially slidably disposed in the rail (31), a transmission shaft (34) arranged parallel to the axis of the rotating drum (2), and two gears (33) disposed at both ends of the transmission shaft (34), wherein one gear (33) meshes with the rack (32), and the other gear (33) meshes with the outer ring teeth of the outer gear ring (4); The inner end of the rack (32) passes through the rotating cylinder (2) and is connected to the pitch adjustment mechanism (6); Each set of pitch adjustment mechanism (6) includes multiple universal bullseye wheels (69) arranged along the axis of the rotating drum (2), and a distance sensor (8) is provided between adjacent universal bullseye wheels (69) for detecting changes in their relative positions. The pitch adjustment mechanism (6) further includes a roller frame (61) connected to the inner end of the rack (32), a pitch cam (62) rotatably disposed in the roller frame (61), a first guide rod (63) fixed in the roller frame (61), and a plurality of sliders (64) slidably disposed on the first guide rod (63). The outer peripheral surface of the pitch cam (62) is provided with pitch grooves (621) equal in number to the universal bullseye wheels (69) on the same side. Each slider (64) is provided with a roller (65) that slides in cooperation with the pitch groove (621). Each slider (64) has a bracket (66) on the side away from the roller (65). A second guide rod (67) is fixed on the bracket (66). The axis of the second guide rod (67) is parallel to the axis of the rotating drum (2). The universal bullseye wheel (69) is slidably sleeved on the second guide rod (67). The universal bullseye wheel (69) points to the central axis of the rotating drum (2). A return spring (68) is sleeved on the second guide rod (67) on both sides of the universal bullseye wheel (69).

2. The marine steel wire rope testing device according to claim 1, characterized in that: When the variable pitch cam (62) rotates around its own axis, all the sliders (64) that cooperate with the variable pitch groove (621) move synchronously on the first guide rod (63), and the distance between all adjacent sliders (64) remains equal at any rotation position.

3. The marine steel wire rope testing device according to claim 2, characterized in that: The pitch adjustment mechanism (6) is provided with a self-locking drive mechanism (7) at one end. The self-locking drive mechanism (7) includes a worm wheel (71) that is coaxially fixed with the pitch cam (62) and a worm (72) that meshes with the worm wheel (71).

4. The marine steel wire rope testing device according to claim 3, characterized in that: A pressure sensor (5) is provided between the inner end of the rack (32) and the roller (61).

5. The marine steel wire rope testing device according to claim 4, characterized in that: The needle roller bearing (1) is coaxially provided with a guide ring (11) for guiding the wire rope at the rear, and the outer surface of the rear end of the drum (2) is provided with a constraint groove (21) that fits into the needle roller bearing (1).

6. The marine steel wire rope testing device according to claim 5, characterized in that: Both the rotating cylinder (2) and the outer gear ring (4) are provided with levers (9) for applying relative rotation.

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