Guiding and conveying mechanism and cable insulation invisible damage detection device

Abstract

The utility model relates to the technical field of cable detection, in particular to a guiding and conveying mechanism which comprises a guiding pulley block. The guide pulley block comprises two first guide wheels which are provided with brackets and are symmetrically distributed, and a second guide wheel which is positioned in the middle of the two first guide wheels; a first supporting piece is fixed to the top of the first guide wheel, a second supporting piece is fixed to the bottom of the second guide wheel, and the first supporting piece and the second supporting piece can be clamped with each other. And the first guide wheel and the second guide wheel are sequentially arranged to form a cable passing path. The utility model has the beneficial effects that the guide pulley blocks which are staggered up and down form a composite stress field, and the traditional scheme of synchronously applying three mechanical stresses of bending, stretching and extruding is mostly single-direction stress, so that hidden damage is physically expanded when passing through the pulley.

Description

Technical Field

[0001] This utility model relates to the field of cable testing, and in particular to a guiding mechanism and a device for detecting hidden damage to cable insulation. Background Technology

[0002] Cables are made of one or more insulated conductors and an outer insulating protective layer. They transmit electricity or information from one place to another. Although the outer insulating protective layer of a cable has good protective performance, if it is damaged, exposing the inner core of the cable, it will cause the risk of leakage.

[0003] A cable insulation testing and guiding mechanism disclosed in Chinese patent document publication number CN213986706U includes a resistance tester, a collection box, a vibration table, an insulation box, and a cable reel for winding one end of the cable. The bottom fixed part of the vibration table is installed in the center of the inner bottom surface of the collection box, and the upper surface of the top vibrating part of the vibration table is fixedly connected to the outer bottom surface of the insulation box. Each of the corresponding two side walls of the insulation box has a through hole, in which an insulating rubber sleeve adapted for the cable to move through is sealed and fixed. The insulation box is filled with iron sand, and a conductive plate is fixed to the inner bottom surface of the insulation box. One end of the conductive plate is connected to a conductive rod that protrudes from the side wall of the insulation box. The two measuring connectors of the resistance tester are respectively connected to the conductive rod and the inner core of the other end of the cable. Although the above-mentioned cable insulation testing and guiding mechanism achieves sufficient contact with the cable surface through the vibration of the iron sand, the iron sand is a solid particle conductor, which has certain limitations in contact with damaged cable insulation and lacks sensitivity. Furthermore... When the device is in use, the cable moves in and out of the insulation box on both sides. The iron sand will vibrate and leak during operation, requiring the collection of the iron sand that is carried out and the addition of iron sand to the inside of the insulation box. This makes the device inconvenient to use and impractical.

[0004] A cable insulation testing guide mechanism, disclosed in Chinese Patent Publication No. 2024206086965, includes a multimeter body. The two probes of the multimeter body are electrically connected to alligator clips that hold the copper core of the cable, and a water-absorbing flexible structure that fits around the outside of the cable insulation layer. The water-absorbing flexible structure is fixed to the inner wall of an insulating collar. This invention, by electrically connecting the alligator clips and the water-absorbing flexible structure to the two probes of the multimeter body, enables both probes to contact the copper core inside the cable when the cable insulation is damaged, thereby detecting the resistance value and determining the insulation. However, it still suffers from low sensitivity and low detection rate for invisible cable defects such as minute cracks.

[0005] In summary, traditional detection and guiding mechanisms have the problem that traditional guide pulley systems are difficult to expose internal cable damage due to the force applied in only one direction. Utility Model Content

[0006] Therefore, the technical problem to be solved by this utility model is that traditional guide pulley systems are unable to expose internal damage to cables due to force applied in a single direction.

[0007] The above-mentioned technical problems are solved by the following technical solution: This utility model proposes a guiding mechanism, a guide pulley group; the guide pulley group includes two first guide wheels symmetrically distributed with supports and a second guide wheel located in the middle of the two first guide wheels; the first guide wheels and the second guide wheels are arranged in sequence to form the path through which the cable passes.

[0008] In a preferred embodiment of the guiding mechanism of this utility model: both the first guide wheel and the second guide wheel are inserted into the second support member, and the second guide wheel is rotatably mounted on the second support member.

[0009] In a preferred embodiment of the guiding mechanism of this utility model: the first guide wheel and the second guide wheel are not on the same horizontal plane.

[0010] In a preferred embodiment of the guiding mechanism of this utility model, it further includes two roller components, one side of which is provided with an arc-shaped disk, and the roller components are rotatably mounted on the first support component; the surface of the arc-shaped disk is embedded with a plurality of friction block arrays.

[0011] In a preferred embodiment of the guiding mechanism of this utility model: the installation directions of the two roller components are staggered; the surface of the arc-shaped disk is provided with at least one smooth area.

[0012] The beneficial effects of this utility model are as follows: the guide pulleys arranged in an alternating manner form a composite stress field, simultaneously applying bending, tension and compression triple mechanical stress. Traditional solutions are mostly subjected to force in a single direction, causing hidden damage to be physically expanded when passing through the pulleys.

[0013] The alternating layout of smooth and friction zones creates a dynamic balance, which automatically eliminates torsional stress while ensuring traction and preventing cable damage.

[0014] In actual use, there are still problems such as low and uneven hot air drying efficiency.

[0015] To solve the above-mentioned technical problems, this utility model also provides the following technical solution: a detection device for hidden damage to cable insulation, comprising a guiding mechanism, and including a second support member as a liquid storage tank, the inside of which is filled with a conductive solution; a measuring metal conductor is provided inside the second support member, and a multimeter is provided on the outside of the second support member, the multimeter having a first electrode and a second electrode, the first electrode of the multimeter being connected to a cable and the second electrode being connected to the measuring metal conductor; it also includes a drying box, which is located outside the second support member; the inside of the drying box is divided into multiple intersecting air ducts by a partition; and a heating unit, located outside the drying box, for drying the damp cable passing through the drying box.

[0016] In a preferred embodiment of the cable insulation hidden damage detection device of this utility model: the drying box includes a cover plate and a box body, which are connected by a hinge.

[0017] In a preferred embodiment of the cable insulation hidden damage detection device of this utility model: an air inlet and an air outlet are respectively provided at both ends of the drying box.

[0018] In a preferred embodiment of the detection device for hidden damage to cable insulation of this utility model: the first support member is disposed above the second support member, and the first support member is a cover plate.

[0019] The beneficial effects of this invention are as follows: by completely immersing the cable in a conductive solution, the conductivity of the solution is used to amplify the resistance change caused by minor damage to the cable, thus improving the sensitivity compared to traditional air medium detection.

[0020] The air duct formed by the partition extends the hot air path length, forcing the hot air to change its flow direction multiple times, significantly increasing the contact area between the hot air and the cable surface. Compared with traditional straight air ducts, it avoids hot air short-circuiting and ensures that moisture is fully carried away from the cable surface and interior. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this utility model and are not intended to limit the scope of this utility model. Wherein:

[0022] Figure 1 A three-dimensional schematic diagram of a guiding mechanism is shown;

[0023] Figure 2 A horizontal cross-sectional view of a guiding mechanism is shown;

[0024] Figure 3 A schematic diagram of cable bending in a guiding mechanism is shown;

[0025] Figure 4A three-dimensional schematic diagram of a roller component of a guiding mechanism is shown;

[0026] Figure 5 A horizontal schematic diagram of a roller component of a guiding mechanism is shown;

[0027] Figure 6 A three-dimensional schematic diagram of a device for detecting hidden damage to cable insulation is shown.

[0028] Figure 7 An exploded three-dimensional schematic diagram of a device for detecting hidden damage to cable insulation is shown. Detailed Implementation

[0029] To enable those skilled in the art to better understand this utility model, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0030] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of this invention; however, these terms may vary according to the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this invention.

[0031] Reference Figure 1-3 This embodiment provides a guiding mechanism, including a guide pulley assembly 22 for guiding a cable 23 along a predetermined path. A first support 11 is provided above a second support 1, and the first support 11 is detachably installed at the top opening of the second support 1. The guide pulley assembly 22 includes two first guide wheels 221 symmetrically distributed on the lower surface of the first support 11 with brackets, and a second guide wheel 222 located in the middle of the two first guide wheels 221. Both the first guide wheels 221 and the second guide wheel 222 are submerged in a conductive solution. The middle portions of both the first guide wheels 221 and the second guide wheel 222 are concave to stabilize the rolling of the cable 23. The second guide wheel 222 is rotatably mounted on the second support 1. The first guide wheels 221 and the second guide wheels 222 are not on the same horizontal plane, and the first guide wheels 221 and the second guide wheels 222 are arranged sequentially to form an S-shaped path. Fixed pulleys 12 are installed at both ends of the second support member 1. The surface of the fixed pulleys 12 is provided with V-shaped guide grooves to accommodate cables 23 of different diameters, effectively guide the cables 23 to slide smoothly within them, reduce wear caused by contact between the insulation layer of the cable 23 and the second support member 1, and avoid damage to the insulation layer.

[0032] In this embodiment, a first support 11 is provided above the second support 1 for easy maintenance and inspection. The first support 11 is fixed to the top opening of the second support 1 in a detachable manner, which facilitates internal cleaning or replacement of conductive solution by the user.

[0033] The guide pulley assembly 22 includes two different sets of guide wheels: a first guide wheel 221 and a second guide wheel 222. These two sets of guide wheels work together to ensure that the cable 23 can pass smoothly through the conductive solution within the second support member 1.

[0034] The first guide wheel 221 consists of two guide wheels with brackets symmetrically distributed on the lower surface of the first support member 11. This ensures that when the cable 23 enters the second support member 1, it can first pass through these two guide wheels, thus guaranteeing the stability of the entry angle of the cable 23.

[0035] The second guide wheel 222 is located between the two first guide wheels 221 and is not on the same horizontal plane as the first guide wheels 221. This arrangement forms an S-shaped path, which ensures that the cable 23 undergoes bending and stretching in multiple directions as it passes through the entire device, thereby improving conductivity.

[0036] Fixed pulleys 12 are also provided at both ends of the second support member 1. Each fixed pulley 12 has a V-shaped guide groove on its surface, which can automatically adapt to cables 23 of different diameters, ensuring that cables 23 of various specifications can be well supported and guided.

[0037] Because of the presence of the fixed pulley 12, the cable 23 will not directly contact the second support member 1 during the process of entering and exiting the second support member 1, but will slide along the V-shaped guide groove, which greatly reduces the risk of insulation layer damage caused by friction.

[0038] By properly arranging the positions of the guide pulley block 22 and the fixed pulley 12, the cable 23 can maintain its optimal posture throughout the entire process.

[0039] In this embodiment, the guide pulley assembly 22 is arranged in a staggered manner. This layout ensures that the cable 23 undergoes bending and stretching in multiple directions as it passes through the entire device.

[0040] Whether the damage is located at the top or bottom of the cable 23, it will be identified when passing through the guide pulley assembly 22. This is because when the cable 23 passes through the staggered fixed pulleys 12, the damaged area will be squeezed and expanded by the pulleys, making the damage more obvious.

[0041] refer to Figure 3-5As an optional embodiment, two roller components 4 are provided, with an arc-shaped disk 41 on one side of each roller component 4. Multiple friction block arrays 42 are embedded on the surface of the arc-shaped disk 41. The cable 23 contacts the multiple friction block arrays 42, forming a spiral trajectory and generating torsional deformation. The cable 23 first contacts the arc-shaped disk 41 on the roller component 4, and the friction between the cable 23 and the arc-shaped disk 41 is increased by the friction block array 42. The surface of the arc-shaped disk 41 has at least one smooth area 43. The smooth area 43 is for direct contact with the cable 23. When the cable 23 contacts the smooth area 43 under its own elastic force, it can automatically perform a torsional recovery action, thereby avoiding applying excessive torsional force to the cable 23. When the cable 23 rolls on the roller component 4, due to the friction, the cable 23 generates lateral displacement and slides along the inclined plane, thus forming a spiral trajectory in the vertical direction. When the cable 23 twists, the damaged area is subjected to compression and expansion, which helps to more accurately identify the location and extent of damage to the cable 23. The two roller components 4 are installed in opposite directions, so that the cable 23 can undergo two torsion processes in different directions; no matter whether the cable 23 is damaged on the left or right side, there is always an arc-shaped disc 41 in one direction that can expand the cable 23 to ensure more accurate measurement results.

[0042] In this embodiment, the roller component 4 can replace the first roller, allowing the cable 23 to roll on its surface, thereby generating the necessary motion trajectory.

[0043] An arc-shaped disc 41 is mounted on one side of the roller component 4. The arc-shaped disc 41 is the main contact point between the cable 23 and the roller component 4. It is arc-shaped to ensure that the cable 23 can roll smoothly on it, and also to facilitate the formation of the required spiral trajectory.

[0044] The friction block array 42 is embedded in the surface of the arc-shaped disk 41. The friction block array 42 increases the friction between the cable 23 and the arc-shaped disk 41, enabling the cable 23 to move along a predetermined path under a smaller external force. This helps the cable 23 form the desired helical trajectory.

[0045] A smooth area 43 is provided in one or more areas on the surface of the arc-shaped disk 41 for direct contact with the cable 23. When the cable 23 contacts the smooth area 43, the cable 23 can automatically perform a torsion recovery action, effectively avoiding damage caused by excessive torsion.

[0046] In terms of working principle, cable 23 first contacts the arc-shaped disk 41 on roller 4. The friction between the two is increased by the friction block array 42, causing cable 23 to roll along a predetermined path. During this process, cable 23 slides along the inclined plane, thus forming a spiral trajectory in the vertical direction. This process uses friction to guide the movement of cable 23, causing it to produce appropriate torsional deformation, but without causing excessive twisting of cable 23.

[0047] When cable 23 twists, the damaged area is subjected to compression and expansion, helping to accurately determine the location and extent of the damage. Furthermore, the two rollers 4 are installed in opposite directions, meaning cable 23 will undergo two twisting processes in different directions. This is to ensure effective detection and treatment regardless of whether the damage to cable 23 is on the left or right side. A measuring metal conductor 3, a copper plate structure penetrating the first support 11, has a measuring metal conductor 3 located above the first support 11 and a conductive section extending into the second support 1 at both ends. A multimeter is connected to cable 23 via its first electrode and to the measuring metal conductor 3 via its second electrode. The multimeter has a built-in fault diagnosis module that monitors resistance changes in real time, triggering an alarm when the resistance drops to a set threshold.

[0048] refer to Figure 6-7 This embodiment provides a detection device for hidden damage to cable insulation, including a second support member 1 which is a liquid storage tank containing a conductive solution; a measuring metal conductor 3 is provided inside the second support member 1, and a multimeter is provided on the outside of the second support member 1, with a first electrode and a second electrode on the multimeter. The first electrode of the multimeter is connected to a cable 23, and the second electrode is connected to the measuring metal conductor 3; it also includes a drying box 5 located outside the second support member 1; the interior of the drying box 5 is divided into multiple intersecting air ducts 6 by a partition; and a heating unit located outside the drying box 5 to dry the damp cable 23 passing through the drying box 5.

[0049] In this embodiment, the interior of the drying box 5 is divided into at least five areas by partitions, forming air ducts 6. This not only increases the contact area between hot air and the surface of the cable 23, improving drying efficiency, but also helps to evenly distribute heat, ensuring that the cable 23 receives a consistent drying effect. Furthermore, the drying box 5 includes a cover plate 51 and a box body 52, which are connected by hinges and sealed with a snap-fit, ensuring that hot air does not leak during operation and improving energy utilization.

[0050] The working principle involves the heating unit being configured to deliver hot air from the air inlet into the air duct 6. This process involves drawing in outside air with a fan, heating it with the heating element, and then delivering it into the drying box 5 at an appropriate speed and temperature. Adjusting the airflow and temperature according to actual needs allows for adaptation to the drying requirements of cables 23 under different humidity conditions.

[0051] The air duct 6 inside the drying box 5 increases the length of the hot air path, allowing the hot air to fully contact the surface of the cable 23 during its flow, thereby effectively removing moisture from the surface and inside of the cable 23. At the same time, it also avoids the problem of localized overheating caused by hot air directly impacting a specific part of the cable 23.

[0052] The coaxial cable pass-through holes 53 on the side panels and partitions allow the cable 23 to pass through, ensuring that the cable 23 can enter the drying box 5 for drying without being removed. This not only simplifies operation but also reduces the time and cost of cable 23 installation and maintenance.

[0053] The outlet direction of the hot air device is at an angle of 15-45° to the axis of the air duct 6, so that the hot air can form a more complex vortex structure after entering the air duct 6, which enhances the heat exchange efficiency, while reducing airflow resistance and reducing energy consumption.

[0054] Finally, the dried cable 23 can be directly wound onto the reel for easy storage or use by staff.

[0055] The measuring metal conductor 3 adopts a copper plate structure, which has good conductivity. One end of it serves as the measuring metal conductor 3, located above the first support member 11, while the other end extends into the second support member 1 to form a conductive section. When the cable 23 is immersed in a conductive solution, current can be transmitted to the cable 23 through the measuring metal conductor 3, thereby realizing the measurement of the resistance value. This ensures the stability and reliability of signal transmission and also helps to improve detection sensitivity.

[0056] The multimeter is connected to cable 23 via its first electrode and to the measuring metal conductor 3 via its second electrode. A built-in fault diagnosis module monitors changes in resistance in real time. Once the resistance value drops to a set threshold, an alarm is triggered. This method not only promptly identifies potential problems but also helps to quickly pinpoint the exact location of the fault, significantly improving repair efficiency.

[0057] The working principle is as follows: When testing a section of cable 23, it is first placed into the second support 1 containing a conductive solution, and the guide pulley group 22 is used to ensure that the cable 23 is in the correct position. Then, the multimeter is powered on, allowing current to flow into the cable 23 through the measuring metal conductor 3. At this time, the multimeter starts working and continuously monitors the resistance value in the circuit.

[0058] If cable 23 is intact, its resistance remains relatively stable. However, if cable 23 is damaged or corroded, the resistance in the corresponding area will change. Specifically, when the insulation of cable 23 is intact, the multimeter will display a very high resistance value (greater than 10 MΩ) due to its high impedance characteristics. Conversely, if the insulation of cable 23 is damaged, current can flow to the external environment through the damaged area, causing the measured resistance value to decrease significantly (possibly to 1 MΩ or lower). By continuously moving cable 23 and monitoring the resistance change, the location of the insulation damage can be accurately determined.

[0059] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of this utility model.

Claims

1. A guiding mechanism, characterized in that: Including the guide pulley block (22); The guide pulley assembly (22) includes two first guide wheels (221) symmetrically distributed with brackets and a second guide wheel (222) located in the middle of the two first guide wheels (221). The first guide wheel (221) is fixed with a first support member (11) at the top, and the second guide wheel (222) is fixed with a second support member (1) at the bottom, and the first support member (11) and the second support member (1) are detachably installed together; The first guide wheel (221) and the second guide wheel (222) are arranged in sequence to form the path through which the cable (23) passes.

2. The guiding mechanism according to claim 1, characterized in that: The first guide wheel (221) and the second guide wheel (222) are both inserted into the second support member (1), and the second guide wheel (222) is rotatably mounted on the second support member (1).

3. The guiding mechanism according to claim 2, characterized in that: The first guide wheel (221) and the second guide wheel (222) are not on the same horizontal plane.

4. The guiding mechanism according to any one of claims 1 to 3, characterized in that: It also includes two roller components (4), one side of which is provided with an arc-shaped disk (41), and the roller components (4) are rotatably mounted on the first support component (11); The surface of the arc-shaped disk (41) is embedded with an array of friction blocks (42).

5. The guiding mechanism according to claim 4, characterized in that: The installation directions of the two roller components (4) are staggered. The surface of the arc-shaped disk (41) is provided with at least one smooth area (43).

6. A detection device for hidden damage to cable insulation, comprising a guiding mechanism as described in any one of claims 1 to 5, characterized in that: The second support member (1) is a liquid storage tank, which contains a conductive solution; The second support member (1) has a measuring metal conductor (3) inside and a multimeter is provided on the outside of the second support member (1). The multimeter has a first electrode and a second electrode. The first electrode of the multimeter is connected to a cable (23) and the second electrode is connected to the measuring metal conductor (3). It also includes a drying box (5), which is located outside the second support member (1); The interior of the drying box (5) is divided into multiple intersecting air ducts (6) by partitions; A heating unit is located outside the drying box (5) to dry the damp cable (23) that passes through the drying box (5).

7. The detection device for hidden damage to cable insulation according to claim 6, characterized in that: The drying box (5) includes a cover plate (51) and a box body (52), which are connected by hinges.

8. The detection device for hidden damage to cable insulation according to claim 7, characterized in that: The side plate and partition of the drying box (5) are provided with coaxial wire holes (53) for cables (23) to pass through.

9. The detection device for hidden damage to cable insulation according to claim 8, characterized in that: The drying box (5) is provided with an air inlet and an air outlet at both ends.

10. The detection device for hidden damage to cable insulation according to claim 9, characterized in that, The first support member (11) is located above the second support member (1), and the first support member (11) is a cover plate.

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