Fair lead clamp inserting piece and using method

Abstract

The invention discloses a fairlead clamp insertion piece and a using method, and relates to the technical field of ship fairlead holes, the fairlead clamp insertion piece comprises a lower sleeve shell and an upper sleeve shell, the upper sleeve shell is placed on the top of the lower sleeve shell, and the lower sleeve shell and the upper sleeve shell are in butt joint through a mortise and tenon joint structure or are connected through an insertion structure; the mortise and tenon joint structure comprises connecting holes, limiting holes, limiting rods, threaded holes and screws, the connecting holes are distributed in the inner surface of the upper sleeve shell, the limiting holes are evenly formed in the outer surface of the lower sleeve shell, the limiting holes and the connecting holes are distributed in a cross shape, the limiting rods are inserted into the limiting holes, and the threaded holes are formed in the threaded holes. And threaded holes are formed in the outer surfaces of the limiting rods in a penetrating mode, and threaded rods are in threaded connection with the interiors of the threaded holes. The probability that the upper sleeve shell is separated from the lower sleeve shell in the using process is reduced in a mortise and tenon joint structure butt joint mode, the inserting piece can be firmly fixed in the ship cable guide clamp in a split type fastening connection mode, and reliability is higher.

Description

Technical Field

[0001] The invention relates to the technical field of ship chocks, in particular to a chock insert and a use method thereof. Background Art

[0002] A cable guide is a cable guide device that guides the cable out of the ship and is widely used in the mooring of ships and marine engineering. The traditional cable guide has a large structure and contains reinforcing ribs, and the friction between the cable and the cable is large. The existing method is to add an insert inside the cable guide to avoid direct contact between the cable and the cable guide hole to reduce the wear of the cable. However, in actual use, the strength of the cable guide insert cannot be guaranteed and the convenience of maintenance is poor, which has certain defects.

[0003] The defects of the existing chock insert are: 1. In patent document CN105730627B, the direct contact between the cable and the fairlead is avoided mainly by adding a friction reducing device, thereby reducing the friction between the fairlead and the cable, but it does not take into account that the strength of the existing cable guide insert is not guaranteed and the convenience of maintenance is poor; 2. In the patent document CN106240747B, the traditional reinforcing ribs are eliminated, the processing technology is reduced, and the materials are saved, and sufficient strength and stability can be obtained with the least amount of materials. However, it does not take into account that the friction between the existing cable guide insert and the cable is still static friction, and the cable wear is relatively serious; 3. In the application document CN116857271A, the safety of installation and use of the protective cover is mainly improved by offsetting the shrinkage effect of the protective cover caused by climate reasons, but the problem that the existing cable guide insert cannot be monitored for falling off is not taken into consideration; 4. In patent document CN219659364U, the contact end faces of the fairlead sheath and the cable are set as smooth surfaces to reduce the wear of the cable on the fairlead sheath surface. However, it is not considered that the existing fairlead insert cannot monitor the wear degree of the cable. Summary of the invention

[0004] The object of the present invention is to provide a chock insert and a method of use to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a cable guide insert, comprising a lower casing and an upper casing, the upper casing being placed on top of the lower casing, the lower casing and the upper casing being connected by a mortise and tenon structure or a plug-in structure; The mortise and tenon structure includes a connecting hole, a limiting hole, a limiting rod, a threaded hole and a screw. The inner surface of the upper shell is provided with a connecting hole, and the connecting hole extends to the interior of the lower shell. The outer surface of the lower shell is provided with evenly arranged limiting holes, and the limiting holes and the connecting holes are distributed in a cross shape. The limiting hole is inserted into the interior of the limiting hole, and the outer surface of the limiting rod is penetrated by a threaded hole. The interior of the threaded hole is threadedly connected to a screw, and the screw is located in the connecting hole.

[0006] Preferably, chamfering or guiding components are added to the inner surfaces of the lower and upper shells, and the addition of chamfering and the arrangement of guiding components are used to reduce friction between the cable and the lower and upper shells, and the angle of the chamfering is 45°.

[0007] Preferably, the plug-in structure includes a socket arranged on the top of the lower shell, a pressure sensor is embedded in the bottom wall of the socket, a plug rod is installed at the bottom of the upper shell, and the plug rod is engaged with the socket, and the bottom of the plug rod is in contact with the top of the pressure sensor.

[0008] Preferably, the guide assembly includes a roller and a wear-resistant layer, the inner surfaces of the lower shell and the upper shell are provided with a storage groove, the interior of the storage groove is equipped with a roller through a shaft, and the outer surface of the roller is coated with a wear-resistant layer.

[0009] Preferably, the outer surfaces of the lower shell and the upper shell are both provided with lifting holes.

[0010] Preferably, the guide assembly may include a limit plate, a pressure roller and a laser rangefinder, and the inner surfaces of the lower shell and the upper shell are both provided with two storage grooves, and the interior of the two storage grooves is provided with symmetrically arranged limit plates, and the surfaces of the two groups of limit plates close to each other are provided with pressure rollers arranged up and down through shafts, and the surfaces of the two groups of limit plates close to each other are both embedded with three groups of equidistantly arranged laser rangefinders.

[0011] Preferably, the inner surfaces of the lower shell and the upper shell are coated with a second wear-resistant layer.

[0012] Preferably, the cable clamp insert also includes a cushion layer inserted in the cable clamp, and the inner surface of the cushion layer is in contact with the outer surfaces of the lower casing and the upper casing, and the cushion layer is used to accommodate the size error of the cable clamp.

[0013] Preferably, the method of using the chock insert is as follows: S1. Before using the cable guide insert, add chamfering technology or arrange guide components on the inner surface of the lower and upper casings to reduce the friction between the cable and the cable guide insert during the retraction and release process; S2. Insert the lower shell and the upper shell into the cable guide, and select a mortise and tenon structure or a plug-in structure to connect the lower shell and the upper shell together.

[0014] Preferably, in S2, the following steps are also included: S21, when the plug-in structure is selected for connection, a guide structure is installed on the inner surface of the lower shell and the upper shell, and when the material groove 1 is selected for arrangement, the static friction between the cable and the inner surface of the lower shell and the upper shell during the retraction and release process is converted into sliding friction by using the arrangement of rollers; When the second material slot is selected, two sets of rollers are arranged through the limit plate, so that the limit plate and the roller can limit the inserted cable, and the laser rangefinder is used to detect the wear of the cable; S22. When the cable is passed between the two sets of rollers, the distances between the three sets of laser rangefinders on one set of limit plates and the outer surface of the cable are recorded as A, B and C respectively, and then the distances between the three sets of laser rangefinders on the other set of limit plates and the outer surface of the cable are recorded as A′, B′ and C′ respectively; After the cable is retracted and released in the roller for a period of time, the distances between the three laser distance meters on one set of limit plates and the outer surface of the cable are recorded as D, E and F respectively, and then the distances between the three laser distance meters on the other set of limit plates and the outer surface of the cable are recorded as D′, E′ and F′ respectively; When A+A′=D+D′, B+B′=E+E′ or C+C′=F+F′, the cable is not worn. When A+A′<D+D′, B+B′<E+E′ or C+C′<F+F′, the cable is worn.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses the mortise and tenon structure to further enhance the strength of the upper shell and the lower shell after they are combined, and the upper shell has a 45 degree bevel at the joint, which makes the joint more convenient and quick.

[0016] 2. The present invention reduces the risk of possible cable wear to a minimum by adding chamfering technology or guide components, thereby extending the service life of the cable.

[0017] 3. The present invention improves the convenience of later maintenance through a split fastening connection method, and through the layout of the pressure sensor, the connection between the upper shell and the lower shell can be monitored during use, so as to determine whether the connection between the upper shell and the lower shell is loose, and the reliability is higher.

[0018] 4. The present invention changes the static friction between the cable and the inner surface of the cable guide insert into sliding friction by arranging the guide assembly, and can also monitor the wear of the cable during use, and send out an alarm when excessive wear of the cable is detected to alert the ship's crew. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a plan view of the present invention; Figure 3 It is a schematic diagram of the assembly structure of the limit rod and the screw rod of the present invention; Figure 4 It is a schematic diagram of the assembly of the upper housing and the roller of the present invention; Figure 5 It is a schematic diagram of the planar assembly structure of the plug-in structure of the present invention; Figure 6 It is a schematic diagram of the planar assembly structure of the roller of the present invention; Figure 7 It is a schematic diagram of the planar assembly structure of the limiting plate and the pressure roller of the present invention; Figure 8 It is a schematic diagram of the planar assembly structure of the cushion layer of the present invention; Fig. 9 It is a schematic diagram of the planar assembly structure of the limit plate and the laser rangefinder of the present invention; Fig.10 It is a detection schematic diagram of the laser rangefinder of the present invention.

[0020] In the figure: 1. lower shell; 2. upper shell; 3. connecting hole; 4. limit hole; 5. limit rod; 6. threaded hole; 7. screw; 8. plug rod; 9. pressure sensor; 10. lifting hole; 11. roller; 12. wear-resistant layer 1; 13. limit plate; 14. pressure roller; 15. laser rangefinder; 16. cushion layer; 17. wear-resistant layer 2. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1,

[0024] See also Figure 1 , Figure 2 and Figure 3 An embodiment of the present invention is: a cable guide insert, an upper shell 2 is placed on the top of the lower shell 1, and the lower shell 1 and the upper shell 2 are connected by a mortise and tenon structure or a plug-in structure, the mortise and tenon structure includes a connecting hole 3, a limiting hole 4, a limiting rod 5, a threaded hole 6 and a screw 7, the inner surface of the upper shell 2 is provided with a connecting hole 3, and the connecting hole 3 extends to the inside of the lower shell 1, the outer surface of the lower shell 1 is provided with uniformly arranged limiting holes 4, and the limiting holes 4 and the connecting holes 3 are distributed in a cross shape, the limiting holes 4 are inserted into the inside of the limiting holes 4, and the outer surface of the limiting rod 5 is penetrated by a threaded hole 6, the inner surface of the threaded hole 6 is threadedly connected with a screw 7, and the screw 7 is located in the connecting hole 3, and the outer surfaces of the lower shell 1 and the upper shell 2 are both provided with lifting holes 10.

[0025] Furthermore, when in use, first insert the limit rod 5 into the limit hole 4, then insert the lower shell 1 and the upper shell 2 into the ship's cable guide or cable guide hole, so that the lower shell 1 can fit with the upper shell 2, and then screw the screw 7 into the connecting hole 3, so that the bottom end of the screw 7 can be threadedly connected with the threaded hole 6, and then the lower shell 1 and the upper shell 2 can be firmly fixed inside the cable guide, and through the arrangement of the lifting hole 10, the installation is more simple and reliable. Embodiment 2,

[0026] See also Figure 5 An embodiment of the present invention is: a cable guide clamp insert, the plug-in structure includes a socket arranged on the top of the lower shell 1, a pressure sensor 9 is embedded in the bottom wall of the socket, a plug rod 8 is installed at the bottom of the upper shell 2, and the plug rod 8 is engaged with the socket, and the bottom of the plug rod 8 is in contact with the top of the pressure sensor 9.

[0027] Furthermore, when selecting the plug-in structure to connect the lower shell 1 and the upper shell 2, first insert the lower shell 1 and the upper shell 2 into the cable guide, and connect the lower shell 1 and the upper shell 2 together by engaging the plug rod 8 with the socket, so that the plug rod 8 can squeeze the pressure sensor 9. At this time, after the lower shell 1 and the upper shell 2 are engaged, the pressure sensor 9 can always detect the pressure index, so that in the subsequent use process, the pressure sensor 9 can be used to detect whether the connection between the lower shell 1 and the upper shell 2 is loose, and when the loose connection is detected, an alarm message is sent to the monitoring center to alert the crew. Embodiment 3,

[0028] See also Figure 4 and Figure 6 An embodiment of the present invention is: a cable guide insert, the inner surfaces of the lower shell 1 and the upper shell 2 are added with chamfering technology or guide components, and the addition of the chamfering technology and the arrangement of the guide components are used to reduce the friction between the cable and the lower shell 1 and the upper shell 2, the chamfering angle is 45°, the guide component includes a roller 11 and a wear-resistant layer 12, the inner surfaces of the lower shell 1 and the upper shell 2 are provided with a storage groove 1, the interior of the storage groove 1 is installed with a roller 11 through a shaft, and the outer surface of the roller 11 is coated with a wear-resistant layer 12.

[0029] Furthermore, when the mortise and tenon structure is selected to connect the lower casing 1 and the upper casing 2, chamfering is added to all positions on the inner surfaces of the lower casing 1 and the upper casing 2 that may contact the cable, thereby minimizing the risk of possible abrasion of the cable. When the plug-in structure is selected to connect the lower shell 1 and the upper shell 2, the inner surface of the lower shell 1 and the upper shell 2 is selected to be provided with a storage groove 1 or a storage groove 2. When the storage groove 1 is provided, a roller 11 is installed on the inner wall of the storage groove 1 through a shaft, and a wear-resistant coating is sprayed on the outer surface of the roller 11, thereby forming a wear-resistant layer 12 on the outer surface of the roller 11. Then, in the subsequent use process, the static friction between the cable and the insert can be changed into sliding friction, thereby reducing the wear of the cable. Embodiment 4,

[0030] See also Figure 7 and Fig. 9 An embodiment of the present invention is as follows: a cable guide insert, a guide assembly or includes a limit plate 13, a pressure roller 14 and a laser rangefinder 15, the inner surfaces of the lower shell 1 and the upper shell 2 are both provided with a second storage groove, the interior of the second storage groove is provided with symmetrically arranged limit plates 13, the surfaces of the two groups of limit plates 13 close to each other are provided with pressure rollers 14 arranged up and down through shafts, and the surfaces of the two groups of limit plates 13 close to each other are both embedded with three groups of equidistantly arranged laser rangefinders 15.

[0031] Furthermore, when the plug-in structure is selected to arrange the material slot two, the cable is limited by the setting of the limit plate 13 and the pressure roller 14, thereby reducing the probability of cable jumping in the horizontal and vertical directions, and during use, the laser rangefinder 15 arranged on the two sets of limit plates 13 is used to detect the wear of the cable, and when the cable is worn to a large extent, a warning signal is sent to the monitoring integrated center, thereby reducing the probability of the cable breaking completely. Embodiment 5,

[0032] See also Figure 8 The present invention provides an embodiment: a cable tongs insert, the inner surfaces of the lower shell 1 and the upper shell 2 are coated with a wear-resistant layer 17, the cable tongs insert also includes a cushioning layer 16 inserted in the cable tongs, and the inner surface of the cushioning layer 16 is in contact with the outer surfaces of the lower shell 1 and the upper shell 2, and the cushioning layer 16 is used to accommodate the size error of the cable tongs.

[0033] Furthermore, a cushioning layer 16 that is compatible with the size error of the cable guide is added between the cable guide and the inserted lower shell 1 and upper shell 2, so that the lower shell 1 and the upper shell 2 can be installed in the cable guide without the need to polish the cable guide, and can be suitable for cable guides of different sizes, thereby reducing the installation time. All components are made of aviation materials, and their corrosion resistance and tightness are the highest level in the current market. Ultra-high molecular weight materials are used to accurately control the thickness of the insert, so that the insert can provide a maximum aperture for the cable to pass through, and the wear of the cable on the lower shell 1 or the upper shell 2 during use is reduced by setting the wear-resistant layer 17, thereby increasing the service life of the cable guide insert. Embodiment 6,

[0034] See also Fig.10 An embodiment of the present invention provides a method for using a cable guide insert. The method for using the cable guide insert is as follows: S1. Before using the cable guide insert, add chamfering technology or arrange guide components on the inner surfaces of the lower casing 1 and the upper casing 2 to reduce the friction between the cable and the cable guide insert during the retraction and release process; S2, inserting the lower casing 1 and the upper casing 2 into the cable guide, and connecting the lower casing 1 and the upper casing 2 together by using a mortise and tenon structure or a plug-in structure.

[0035] In S2, the following steps are also included: S21, when the plug-in structure is selected for connection, the guide structure is installed on the inner surface of the lower shell 1 and the upper shell 2, and when the material groove 1 is selected for layout, the roller 11 is used to convert the static friction between the cable and the inner surface of the lower shell 1 and the upper shell 2 during the retraction and release process into sliding friction; When the second material slot is selected, two sets of rollers 14 are arranged through the limit plate 13, so that the limit plate 13 and the roller 14 can limit the inserted cable, and the laser rangefinder 15 is used to detect the wear of the cable; S22. When the cable is passed between the two sets of rollers 14, the distances between the three sets of laser rangefinders 15 on one set of limit plates 13 and the outer surface of the cable are recorded as A, B and C respectively, and then the distances between the three sets of laser rangefinders 15 on the other set of limit plates 13 and the outer surface of the cable are recorded as A′, B′ and C′ respectively; After the cable is retracted and released in the pressure roller 14 for a period of time, the distances between the three groups of laser rangefinders 15 on one group of limit plates 13 and the outer surface of the cable are recorded as D, E and F respectively, and then the distances between the three groups of laser rangefinders 15 on the other group of limit plates 13 and the outer surface of the cable are recorded as D′, E′ and F′ respectively; When A+A′=D+D′, B+B′=E+E′ or C+C′=F+F′, the cable is not worn. When A+A′<D+D′, B+B′<E+E′ or C+C′<F+F′, the cable is worn.

[0036] Furthermore, when using the laser rangefinder 15 to monitor the wear of the cable, first record the diameter of the cable just inserted into the two sets of rollers 14 as G, and A+G+A′, B+G+B′ and C+G+C′ are equal to the distance between the laser rangefinder 15 on one set of limit plates 13 and the corresponding laser rangefinder 15 on the other set of limit plates 13. After using the cable guide insert for a period of time, if any D+D′>A+A′, E+E′>B+B′ or F+F′>C+C′ detected, the diameter of the cable at the detection point is G′, and G′<G, and the detection results are fed back to the monitoring center, and a three-dimensional image of the cable is generated through continuous monitoring, so that the supervisor can intuitively see the wear of the cable.

[0037] Working principle: Before use, chamfering or guiding components are added to the position where the insert may contact the cable to convert static friction into sliding friction, thereby reducing the wear of the cable, and the lower shell 1 and the upper shell 2 are joined by a mortise and tenon structure or a plug-in structure. During the connection process, a cushioning layer 16 that is compatible with the size error of the cable guide is added to the surface where the cable guide and the insert fit, thereby reducing the installation time and improving the adaptability of the installation.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A chock insert, comprising a lower casing (1) and an upper casing (2), characterized in that: An upper casing (2) is placed on the top of the lower casing (1), and the lower casing (1) and the upper casing (2) are connected by a mortise and tenon structure or a plug-in structure; The mortise and tenon structure comprises a connecting hole (3), a limiting hole (4), a limiting rod (5), a threaded hole (6) and a screw (7); the inner surface of the upper shell (2) is provided with a connecting hole (3), and the connecting hole (3) extends to the interior of the lower shell (1); the outer surface of the lower shell (1) is provided with evenly arranged limiting holes (4), and the limiting holes (4) and the connecting holes (3) are distributed in a cross shape; the limiting rod (5) is inserted into the interior of the limiting hole (4), the outer surface of the limiting rod (5) is penetrated by a threaded hole (6), the interior of the threaded hole (6) is threadedly connected with a screw (7), and the screw (7) is located in the connecting hole (3).

2. A chock insert according to claim 1, characterized in that: A chamfering process or a guide component is added to the inner surfaces of the lower casing (1) and the upper casing (2), and the addition of the chamfering process and the arrangement of the guide component are used to reduce the friction between the cable and the lower casing (1) and the upper casing (2), and the angle of the chamfering process is 45°.

3. A chock insert according to claim 1, characterized in that: The plug-in structure comprises a plug hole arranged at the top of the lower shell (1), a pressure sensor (9) being embedded in the bottom wall of the plug hole, and an insertion rod (8) being installed at the bottom of the upper shell (2), the insertion rod (8) being engaged with the plug hole, and the bottom of the insertion rod (8) being in contact with the top of the pressure sensor (9).

4. A chock insert according to claim 2, characterized in that: The guide assembly comprises a roller (11) and a wear-resistant layer (12); the inner surfaces of the lower shell (1) and the upper shell (2) are provided with a storage groove (1); the interior of the storage groove (1) is provided with a roller (11) via a shaft; and the outer surface of the roller (11) is coated with a wear-resistant layer (12).

5. A chock insert according to claim 1, characterized in that: The outer surfaces of the lower shell (1) and the upper shell (2) are both provided with lifting holes (10).

6. A chock insert according to claim 2, characterized in that: The guide assembly comprises a limit plate (13), a pressure roller (14) and a laser rangefinder (15); the inner surfaces of the lower casing (1) and the upper casing (2) are both provided with two storage grooves; the interior of the two storage grooves is provided with symmetrically arranged limit plates (13); the surfaces of the two groups of limit plates (13) close to each other are provided with pressure rollers (14) arranged up and down via shafts; the surfaces of the two groups of limit plates (13) close to each other are both embedded with three groups of equidistantly arranged laser rangefinders (15).

7. A chock insert according to claim 1, characterized in that: The inner surfaces of the lower casing (1) and the upper casing (2) are coated with a second wear-resistant layer (17).

8. A chock insert according to claim 1, characterized in that: The chock insert also includes a cushion layer (16) inserted into the chock, and the inner surface of the cushion layer (16) fits the outer surfaces of the lower casing (1) and the upper casing (2), and the cushion layer (16) is used to accommodate the size error of the chock.

9. A method for using a chock insert, applicable to a chock insert according to any one of claims 1 to 6, characterized in that: The use of the chock insert is as follows: S1. Before using the chock insert, a chamfering process is added to the inner surfaces of the lower casing (1) and the upper casing (2) or a guide component is arranged to reduce the friction between the cable and the chock insert during the retraction and release process; S2. Insert the lower casing (1) and the upper casing (2) into the cable guide, and select a mortise and tenon structure or a plug-in structure to connect the lower casing (1) and the upper casing (2) together.

10. A method for using a chock insert according to claim 9, characterized in that: In S2, the following steps are also included: S21, when the plug-in structure is selected for connection, a guide structure is installed on the inner surface of the lower casing (1) and the upper casing (2), and when the material groove 1 is selected for arrangement, the roller (11) is arranged to convert the static friction between the cable and the inner surface of the lower casing (1) and the upper casing (2) during the retraction and release process into sliding friction; When the second material slot is selected for arrangement, two groups of pressure rollers (14) are arranged through the limit plate (13), so that the limit plate (13) and the pressure rollers (14) can limit the inserted cable, and the laser rangefinder (15) is used to detect the wear of the cable; S22. When the cable is passed between the two sets of rollers (14), the distances between the three sets of laser distance meters (15) on one set of limit plates (13) and the outer surface of the cable are recorded as A, B and C respectively, and then the distances between the three sets of laser distance meters (15) on the other set of limit plates (13) and the outer surface of the cable are recorded as A′, B′ and C′ respectively; After the cable is retracted and released in the pressure roller (14) for a period of time, the distances between the three sets of laser distance meters (15) on one set of limit plates (13) and the outer surface of the cable are recorded as D, E and F respectively, and then the distances between the three sets of laser distance meters (15) on the other set of limit plates (13) and the outer surface of the cable are recorded as D′, E′ and F′ respectively; When A+A′=D+D′, B+B′=E+E′ or C+C′=F+F′, the cable is not worn. When A+A′<D+D′, B+B′<E+E′ or C+C′<F+F′, the cable is worn.

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