Guiding and conveying mechanism and cable insulation invisible damage detection device

Abstract

The invention 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 device 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] The present invention relates to the field of cable detection, in particular to a feeding mechanism and a detection device for invisible damage to cable insulation. Background Art

[0002] A cable is made of one or more mutually insulated conductors and an outer insulating protective layer, and is used to transmit electricity or information from one place to another. Although the outer insulating protective layer of the cable has good protection performance, once it is damaged and the inner core of the cable is exposed, there will be a risk of electric leakage.

[0003] A cable insulation detection and feeding mechanism with the publication number of CN213986706U in Chinese patent documents. This cable insulation detection and feeding mechanism discloses a resistance tester, a collection box, a vibration table, an insulation box and a cable reel for winding and winding one end of the cable; the bottom fixing part of the vibration table is installed at the center of the inner bottom surface of the collection box, and the upper surface of the top vibration part of the vibration table is fixedly connected to the outer bottom surface of the insulation box; through holes are provided in the centers of the corresponding two side walls of the insulation box, and insulation rubber sleeves whose inner walls are adapted to the cable to pass through are hermetically fixed in the through holes. Iron sand is filled in the insulation box, and a conductive plate is fixed on the inner bottom surface of the insulation box; one end of the conductive plate is connected with a conductive rod passing through the side wall of the insulation box, and the two measuring joints of the resistance tester are respectively correspondingly connected with the conductive rod and the inner core of the other end of the cable. Although the above cable insulation detection and feeding mechanism fully contacts the cable surface through the vibration of the iron sand, however, the iron sand is a solid particle conductor, and there are certain limitations and lack of sensitivity in contacting the damaged cable insulation. At the same time, when the device is in use, the cable moves in and out on both sides of the insulation box, and the iron sand will vibrate and leak during operation. It is necessary to collect the carried-out iron sand and add iron sand to the inside of the insulation box, resulting in inconvenient use of the device and poor practicability.

[0004] A cable insulation detection and feeding mechanism with the publication number of 2024206086965 in Chinese patent documents. This invention includes a multimeter body, and alligator clips clamped on the copper core of the cable and a water-absorbing flexible structure sleeved outside the cable insulation layer are respectively electrically connected to the two pen ends of the multimeter body. The water-absorbing flexible structure is fixed on the inner side wall of a sleeve ring made of an insulating material. This invention realizes that when the cable insulation layer is damaged, the two pen ends can be in contact with the copper core inside the cable by the action of the water-absorbing flexible structure, and then the resistance value is detected to determine the insulation performance. However, there are still problems of low sensitivity and low detection rate for detecting invisible cable defects such as fine cracks.

[0005] In summary, the traditional detection and feeding mechanism has the problem that the traditional guiding pulley group is difficult to expose the internal damage of the cable due to single-direction force. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is: the problem that it is difficult to expose the internal damage of the cable due to the single-direction force of the traditional guiding pulley group.

[0007] The above technical problem is solved by the following technical solution: The present invention provides a guiding mechanism and a guiding pulley group; the guiding pulley group includes two first guiding wheels symmetrically distributed with brackets and a second guiding wheel located in the middle of the two first guiding wheels; the first guiding wheel and the second guiding wheel are arranged in sequence to form a path for the cable to pass through.

[0008] In a preferred embodiment of a guiding mechanism of the present invention: both the first guiding wheel and the second guiding wheel penetrate into the second support member, and the second guiding wheel is rotatably arranged on the second support member.

[0009] In a preferred embodiment of a guiding mechanism of the present invention: the first guiding wheel and the second guiding wheel are not on the same horizontal plane.

[0010] In a preferred embodiment of a guiding mechanism of the present invention: it further includes two roller members, an arc-shaped disc is arranged on one side of the roller member, and the roller member is rotatably installed on the first support member; a plurality of friction block arrays are embedded on the surface of the arc-shaped disc.

[0011] In a preferred embodiment of a guiding mechanism of the present invention: the installation directions of the two roller members are staggered from each other; at least one smooth area is provided on the surface of the arc-shaped disc.

[0012] The beneficial effect of the present invention is that: the guiding pulley groups arranged in a staggered manner up and down form a composite stress field, synchronously applying three mechanical stresses of bending + tension + extrusion. The traditional scheme is mostly single-direction force, so that the hidden damage is physically expanded when passing through the pulley.

[0013] The alternating layout of the smooth area and the friction area forms a dynamic balance, automatically eliminating the torsional stress while ensuring the traction force and avoiding damage to the cable.

[0014] In view of the actual use process, there are also problems of low and uneven hot air drying efficiency.

[0015] In order to solve the above technical problems, the present invention also provides the following technical solutions: a detection device for invisible damage of cable insulation, comprising a guiding mechanism, and comprising a second support member as a liquid storage tank, in which a conductive solution is arranged; a measuring metal conductor is arranged inside the second support member, and a multimeter is arranged outside the second support member, and the multimeter is provided with a first electrode and a second electrode, the first electrode of the multimeter is connected to the cable, and the second electrode is connected to the measuring metal conductor; it also includes a drying box, which is arranged outside the second support member; the interior of the drying box is divided into a plurality of mutually staggered air ducts by partitions; a heating unit is arranged outside the drying box to dry the wet cable passing through the drying box.

[0016] In a preferred embodiment of a device for detecting invisible damage to cable insulation of the present invention: the drying box comprises a cover plate and a box body, and the cover plate and the box body are connected via a hinge.

[0017] In a preferred embodiment of a device for detecting invisible damage to cable insulation of the present invention: an air inlet and an air outlet are respectively provided at both ends of the drying box.

[0018] In a preferred embodiment of a device for detecting invisible damage to cable insulation of the present invention: the first support member is arranged above the second support member, and the first support member is a cover plate.

[0019] The beneficial effects of the present invention are: the cable is completely immersed in a conductive solution, and the conductivity of the solution is used to amplify the resistance change caused by slight damage to the cable, thereby improving the sensitivity compared with traditional air medium detection.

[0020] The air duct formed by partitioning extends the length of the hot air path, forcing the hot air to change 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 removed from the cable surface and inside. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention. Among them:

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

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

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

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

[0026] Figure 5 Shows a horizontal schematic diagram of a roller member of a feeding mechanism;

[0027] Figure 6 Shows a three-dimensional schematic diagram of a detection device for invisible damage to cable insulation;

[0028] Figure 7 Shows an exploded three-dimensional schematic diagram of a detection device for invisible damage to cable insulation. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the detailed implementation manners and the accompanying drawings.

[0030] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention, but these terms may change according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0031] Referring to Figures 1 - 3 , this embodiment provides a feeding mechanism, including a guiding pulley group 22 for guiding a cable 23 to move along a predetermined path; a first support member 11 is provided above a second support member 1, and the first support member 11 is detachably installed at the top opening of the second support member 1; the guiding pulley group 22 includes two first guiding wheels 221 symmetrically distributed with brackets on the lower surface of the first support member 11 and a second guiding wheel 222 located in the middle of the two first guiding wheels 221. Both the first guiding wheel 221 and the second guiding wheel 222 are submerged in the conductive solution. Among them, both the middle parts of the first guiding wheel 221 and the second guiding wheel 222 are recessed inward to play a stabilizing role in the rolling of the cable 23, and the second guiding wheel 222 is rotatably arranged on the second support member 1. The first guiding wheel 221 and the second guiding wheel 222 are not on the same horizontal plane, and the first guiding wheel 221 and the second guiding wheel 222 are arranged in sequence to form an S-shaped path. Fixed pulleys 12 are installed at both ends of the second support member 1, and V-shaped guide grooves are provided on the surfaces of the fixed pulleys 12 to adapt to cables 23 of different diameters, effectively guiding the cable 23 to slide smoothly therein, reducing the wear caused by the contact between the insulating layer of the cable 23 and the second support member 1, and avoiding damage to the insulating layer.

[0032] In this embodiment, for the convenience of maintenance and inspection, a first support member 11 is provided above the second support member 1. The first support member 11 is fixed to the top opening of the second support member 1 by a detachable mounting method, facilitating operations such as internal cleaning or replacement of the conductive solution by the user.

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

[0034] The first guiding wheel 221 consists of two guiding wheels with brackets symmetrically distributed on the lower surface of the first support member 11. When the cable 23 enters the second support member 1, it can first pass through these two guiding wheels, thus ensuring the stability of the entering angle of the cable 23.

[0035] The second guiding wheel 222 is located between the two first guiding wheels 221 and is not on the same horizontal plane as the first guiding wheel 221. Such a layout forms an S-shaped path, which ensures that the cable 23 will experience bending and stretching actions in multiple directions when passing through the entire device, improving the conductive efficiency.

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

[0037] Due to the existence of the fixed pulleys 12, the cable 23 will not directly contact the second support member 1 during the process of entering and leaving the second support member 1, but slides along the V-shaped guide groove, greatly reducing the risk of damage to the insulation layer caused by friction.

[0038] By reasonably arranging the positions of the guiding pulley set 22 and the fixed pulleys 12, the cable 23 can always maintain the best posture throughout the process.

[0039] In this embodiment, the guiding pulley set 22 is arranged in a specific way with upper and lower staggering. This layout ensures that the cable 23 will experience bending and stretching actions in multiple directions when passing through the entire device.

[0040] Whether it is at the top or bottom of the cable 23, it will be identified when passing through the guiding pulley set 22. This is because when the cable 23 passes through the fixed pulleys 12 arranged with upper and lower staggering, the damaged part will be squeezed and expanded by the pulleys. Thus making the damage more obvious.

[0041] Reference Figures 3 - 5, As an alternative embodiment, there are two roller members 4, and on one side of the roller member 4, there is an arc-shaped disk 41; a plurality of friction block arrays 42 are embedded on the surface of the arc-shaped disk 41; the cable 23 contacts the plurality of friction block arrays 42 to form a spiral trajectory and generate torsional deformation. The cable 23 first contacts the arc-shaped disk 41 on the roller member 4, and the friction block array 42 increases the friction force between the cable 23 and the arc-shaped disk 41; there is at least one smooth area 43 on the surface of the arc-shaped disk 41; the smooth area 43 is for direct contact with the cable 23; when the cable 23 contacts the smooth area 43 under the action of its own elastic force, the cable 23 can automatically perform a torsional restoration action, thus avoiding applying excessive torsional force to the cable 23. When the cable 23 rolls on the roller member 4, due to the action of the friction force, the cable 23 generates a lateral displacement and slides along the inclined plane, thus forming a spiral trajectory in the vertical direction. When the cable 23 is twisted, the damaged part will be subjected to extrusion and expansion effects, which helps to more accurately identify the damage position and degree of the cable 23. The installation directions of the two roller members 4 are staggered from each other, so that the cable 23 can experience two torsional processes in different directions; regardless of whether the damaged part of the cable 23 is on the left or right side, there is always an arc-shaped disk 41 in one direction that can expand the cable 23 to ensure more accurate measurement results.

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

[0043] The arc-shaped disk 41 is installed on one side of the roller member 4, and the arc-shaped disk 41 is the main part of the contact between the cable 23 and the roller member 4. It is arc-shaped to ensure that the cable 23 can roll smoothly on it, and at the same time, it is also convenient to form the required spiral trajectory.

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

[0045] The 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 torsional restoration action, effectively avoiding damage caused by excessive torsion.

[0046] Working principle: The cable 23 first contacts the arc-shaped disk 41 on the roller member 4, and the friction block array 42 increases the friction force between the two, causing the cable 23 to roll along a predetermined path. In this process, the cable 23 will slide along the inclined plane, thus forming a spiral trajectory in the vertical direction. This process is to use the friction force to guide the movement of the cable 23, making it generate appropriate torsional deformation without causing excessive twisting of the cable 23.

[0047] When the cable 23 is twisted, the damaged part will be subjected to extrusion and expansion, thus helping to accurately determine the location and degree of the damage. In addition, the installation directions of the two roller members 4 are staggered from each other, which means that the cable 23 will undergo two twisting processes in different directions. The purpose of this is to ensure that effective detection and treatment can be carried out regardless of whether the damaged part of the cable 23 is on the left or right side. The measuring metal conductor 3 is a copper plate structure that penetrates through the first support member 11, and at both ends, a measuring metal conductor 3 located above the first support member 11 and a conductive section extending into the second support member 1 are respectively formed; a multimeter, which is connected to the cable 23 through the first electrode and to the measuring metal conductor 3 through the second electrode; the multimeter is built-in with a fault judgment module to monitor the change of the resistance value in real time, and triggers an alarm when the resistance value drops to the set threshold.

[0048] Reference Figures 6 - 7 , in this embodiment, a detection device for invisible damage to the cable insulation is provided, including that the second support member 1 is a liquid storage tank, and a conductive solution is arranged inside it; a measuring metal conductor 3 is arranged inside the second support member 1, and a multimeter is arranged outside the second support member 1. The multimeter is provided with a first electrode and a second electrode. The first electrode of the multimeter is connected to the cable 23, and the second electrode is connected to the measuring metal conductor 3; a drying box 5 is further included, which is arranged outside the second support member 1; the inside of the drying box 5 is divided into a plurality of staggered air ducts 6 by a partition; a heating unit is arranged outside the drying box 5 to dry the wet cable 23 passing through the drying box 5.

[0049] In this embodiment, the inside of the drying box 5 is divided into at least five regions by a partition to form the air ducts 6. This can not only increase the contact area between the hot air and the surface of the cable 23, improve the drying efficiency, but also help to evenly distribute the heat to ensure a consistent drying effect on the cable 23. In addition, the drying box 5 includes two parts, a cover plate 51 and a box body 52, which are connected by a hinge and are hermetically connected by a buckle, ensuring that the hot air will not leak during the operation process and improving the energy utilization rate.

[0050] Working principle, the heating unit is configured to send hot air into the air ducts 6 from the air inlet. This process is to suck the outside air into the fan and heat it through the heating element, and then send it into the drying box 5 at an appropriate speed and temperature. Adjust the wind speed and temperature according to actual needs to meet the drying requirements of the cable 23 under different humidity conditions.

[0051] The air ducts 6 inside the drying box 5 increase the length of the hot air path, enabling the hot air to fully contact the surface of the cable 23 during the flow process, thereby effectively removing the moisture on the surface and inside of the cable 23. At the same time, it also avoids the problem of local overheating caused by the hot air directly impacting a certain part of the cable 23.

[0052] The coaxial wire passing holes 53 on the side plate and the partition are used for 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 facilitates the operation but also reduces the time cost of cable 23 installation and maintenance.

[0053] The air outlet direction of the hot air device forms an angle of 15 - 45° with the axis of the air duct 6, enabling the hot air to form a more complex eddy current structure after entering the air duct 6, enhancing the heat exchange efficiency, reducing the air flow resistance, and lowering the energy consumption.

[0054] Finally, the dried cable 23 can be directly wound on the wire reel, facilitating the storage or use by the staff.

[0055] The measuring metal conductor 3 adopts a copper plate structure and has good electrical conductivity. One end serves as the measuring metal conductor 3 above the first support 11, and the other end extends into the second support 1 to form a conductive section. When the cable 23 is immersed in the conductive solution, the 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 the detection sensitivity.

[0056] The multimeter is connected to the cable 23 through the first electrode and to the measuring metal conductor 3 through the second electrode. The built - in fault judgment module is responsible for real - time monitoring of the change in the resistance value. Once the detected resistance value drops to the set threshold, the alarm mechanism is triggered. This method can not only detect potential problems in a timely manner but also help to quickly locate the specific location of the fault, greatly improving the maintenance efficiency.

[0057] Working principle: When it is necessary to detect a certain section of the cable 23, first place it in the second support 1 filled with the conductive solution, and use the guiding pulley group 22 to ensure that the cable 23 is in the correct position. Then, turn on the power of the multimeter so that the current flows into the cable 23 through the measuring metal conductor 3. At this time, the multimeter starts to work and continuously monitors the resistance value in the circuit.

[0058] If the cable 23 is normal and undamaged, the resistance value remains at a relatively stable level. However, if there are problems such as damage or corrosion in the cable 23, the resistance of the corresponding area will change. Specifically, when the insulation layer of the cable 23 is intact, due to its high impedance characteristics, the resistance value shown by the multimeter will be very high (greater than 10 MΩ). On the contrary, if the insulation layer of the cable 23 is damaged, the current can flow through the damaged part to the external environment, resulting in a significant decrease in the measured resistance value (possibly dropping to 1 MΩ or lower). By continuously moving the cable 23 and monitoring the resistance change, the position where the insulation layer is damaged can be accurately located.

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

Claims

1. A guiding mechanism, characterized in that: It includes a guide pulley block (22); The guide pulley assembly (22) comprises two first guide wheels (221) with brackets symmetrically distributed and a second guide wheel (222) located in the middle of the two first guide wheels (221); A first support member (11) is fixed on the top of the first guide wheel (221), a second support member (1) is fixed on the bottom of the second guide wheel (222), and the first support member (11) and the second support member (1) can be engaged with each other; The first guide wheel (221) and the second guide wheel (222) are arranged in sequence to form a path for the cable (23) to pass through.

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 deep into the second support member (1), and the second guide wheel (222) is rotatably arranged 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 comprises two roller members (4), one side of each roller member (4) is provided with an arc-shaped disk (41), and each roller member (4) is rotatably mounted on the first support member (11); A plurality of friction block arrays (42) are embedded on the surface of the arc-shaped disk (41).

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

6. A device for detecting invisible damage to cable insulation, comprising a guiding mechanism as claimed in any one of claims 1 to 5, characterized in that: The second support member (1) is a liquid storage tank, in which a conductive solution is arranged; A measuring metal conductor (3) is provided inside the second support member (1), and a multimeter is provided outside the second support member (1), wherein the multimeter is provided with a first electrode and a second electrode, wherein 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 arranged outside the second support member (1); The interior of the drying box (5) is divided into a plurality of mutually interlaced air ducts (6) by partitions; The heating unit is arranged outside the drying box (5) to dry the wet cable (23) passing through the drying box (5).

7. The device for detecting invisible damage to cable insulation according to claim 6, characterized in that: The drying box (5) comprises a cover plate (51) and a box body (52), and the cover plate (51) and the box body (52) are connected via a hinge.

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

9. The device for detecting invisible damage to cable insulation according to claim 8, characterized in that: The two ends of the drying box (5) are respectively provided with an air inlet and an air outlet.

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

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