Cable detection equipment

Abstract

The present application relates to a cable detection device, which belongs to the technical field of detecting cable insulation layer faults. The device includes a driving wheel, a driven wheel, and a detection tube. The cable to be tested is wound around the driving wheel and the driven wheel; the cable to be tested passes through the detection tube; a plurality of detection electrodes are arranged in the detection tube; an electromagnet 3 is connected to the detection electrode, and after the detection electrode contacts the cable to be tested, the electromagnet 3 generates a magnetic field; a plurality of sliding rods are slidably connected to the detection tube; a contact switch is arranged between two adjacent sliding rods; a sliding shaft is slidably connected to the detection electrode, and the sliding shaft is used to mark the cable to be tested; an electromagnet 4 is fixed on the detection electrode and connected to the contact switch. The present application has the effect of improving the efficiency of detecting the resistance value of the insulation layer.

Description

Technical Field

[0001] The present application relates to the technical field of detecting cable insulation layer faults, and in particular to a cable detection device. Background Art

[0002] The integrity of the cable insulation layer is related to the power supply safety and cable life. In the existing technology, manual visual inspection is usually used to inspect the outer skin of the cable, but it has problems of low efficiency and deviation in accuracy. The resistance value detection method is based on the change in the physical properties of the metal conductor exposed due to the damage of the cable insulation layer: when the insulation layer is intact, the conductor-insulation layer is in a high resistance state; when the insulation layer is damaged, a conductive channel is formed at the damaged point due to the lack of the medium, which reduces the local resistance value. By constructing a measurement circuit on the cable insulation layer, the equivalent resistance of the conductor layer and the insulation layer is collected in real time, and the threshold is compared with the preset reference resistance. When

[0003] The fixed-baseline insulation resistance detection system has the following drawbacks: the cable's resistance is significantly affected by the temperature coefficient, resulting in a baseline offset and requiring a compensation factor to be added to the threshold based on different temperature environments. Humidity also causes fluctuations in insulation resistance, overlapping with the frequency band of the actual damage signal. Therefore, using a fixed-threshold detection method requires adjusting the threshold factor based on the specific environment, which can also lead to false alarms, seriously affecting the efficiency of cable insulation fault detection. Summary of the Invention

[0004] In order to improve the problem of low efficiency of the fixed threshold resistance value measurement method, the present application provides a cable detection device.

[0005] The cable detection device provided in this application adopts the following technical solution:

[0006] A cable detection device comprises a driving wheel, a driven wheel and a detection tube, wherein a cable to be tested is wound around the driving wheel and the driven wheel; and the cable to be tested passes through the detection tube.

[0007] Detection electrodes, a plurality of the detection electrodes are arranged in the detection tube;

[0008] an electromagnet three, wherein the electromagnet three is connected to the detection electrode, and the detection electrode contacts the cable to be tested, so that the electromagnet three generates a magnetic field;

[0009] Slide rods and contact switches, wherein a plurality of the slide rods are slidably connected to the detection tube; the contact switch is arranged between two adjacent slide rods;

[0010] a sliding shaft, the sliding shaft being slidably connected to the detection electrode, and the sliding shaft being used to mark the cable to be tested;

[0011] Electromagnet four, the electromagnet four is connected to the detection electrode, the electromagnet four is magnetically attracted to the sliding shaft; the electromagnet four is connected to the contact switch.

[0012] Optionally, a driving motor is further included, and the output shaft of the driving motor is coaxially fixedly connected to the driving wheel.

[0013] Optionally, the driven wheel is arranged on a driven wheel bracket; an electromagnet 1 is fixed on the driven wheel bracket, and the electromagnet 1 fixes the driven wheel by magnetic adsorption with the driven wheel.

[0014] Optionally, the electromagnet is connected to the microcontroller via a relay.

[0015] Optionally, the detection electrode includes electrode 1, electrode 2 and an electrode seat, and the electrode 1 and the electrode 2 are connected to the electromagnet 3 through a transistor; the electrode 1 and the electrode 2 are slidingly connected to the electrode seat respectively.

[0016] Optionally, a second electromagnet is provided on the electrode seat; the first electrode and the second electrode are magnetically attracted to the second electromagnet respectively; and the second electromagnet is connected to the microcontroller via a second relay.

[0017] Optionally, an installation chamber is opened in the detection tube, and the electromagnet three and the sliding rod are both arranged in the installation chamber; the installation chamber is fixed with a reset spring one connected to the sliding rod.

[0018] Optionally, the contact switch includes an electric sheet 1 and an electric sheet 2 respectively provided on two adjacent sliding bars; when two adjacent sliding bars are misaligned, the electric sheet 1 and the electric sheet 2 are in electrical contact.

[0019] Optionally, a fixed tube is fixed on the detection electrode, and the sliding shaft is slidably connected to the fixed tube; a second reset spring is fixed on the fixed tube, and the second reset spring is connected to the sliding shaft.

[0020] Optionally, a liquid outlet cover is fixedly provided at one end of the sliding shaft; a liquid storage tube is fixedly provided inside the sliding shaft, and water-absorbing fibers and ink are arranged in the liquid storage tube.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. A stepper motor drives the active wheel to rotate in steps at intervals of time 1, while electromagnet 1 locks the driven wheel within time 2, achieving intermittent and precise axial movement of the cable under test. The detection electrodes contact the surface of the cable under test when it is stationary, eliminating motion interference.

[0023] 2. The detection electrode group and the surface of the cable under test form a voltage divider circuit. The change in insulation layer resistance is amplified by the transistor, driving electromagnet 3 to generate a gradient magnetic force. The slider displacement is negatively correlated with the resistance value. The slider displacement directly reflects the degree of damage, reducing the interference of resistance fluctuations caused by the fixed threshold and lowering the false alarm rate.

[0024] 3. When the slider exceeds the limit displacement due to the signal of insulation layer damage, its side wall contact switch is turned on, the electromagnet's four adsorption slides compress the liquid storage tube, and ink is sprayed to the damage point through the liquid outlet; the magnetic control marking component is linked with the detection signal in real time to improve the response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the cable detection device according to an embodiment of the present application.

[0026] Figure 2 It is a schematic structural diagram of the detection electrode according to an embodiment of the present application.

[0027] Figure 3 It is a cross-sectional view of the detection tube according to an embodiment of the present application.

[0028] Figure numerals: 1. driving wheel; 2. detection tube; 3. driven wheel; 4. cable to be tested; 5. driving motor; 6. electromagnet 1; 7. detection electrode; 8. electrode 1; 9. electrode 2; 10. electrode seat; 11. electrode slot; 12. mounting chamber; 13. sliding shaft; 14. sliding rod; 15. electromagnet 3; 16. reset spring 1; 17. fixing tube; 18. partition; 19. driven wheel bracket. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-3 This application is described in further detail.

[0030] The present invention discloses a cable testing device. The device includes a reel and a testing tube 2. The reel comprises a driving wheel 1 and a driven wheel 3, respectively disposed at either end of the testing tube 2. A cable 4 to be tested is wound around the driving wheel 1 and the driven wheel 3, and the cable 4 passes through the testing tube 2. A drive motor 5 is fixedly mounted on the wheel frame of the driving wheel 1. The output shaft of the drive motor 5 is coaxially fixedly coupled to the driving wheel 1 and is used to drive the driving wheel 1 in rotation. The drive motor 5 is a stepper motor.

[0031] Specifically, the drive motor controller sends a pulse signal to the drive motor 5 every unit time, causing the output shaft of the drive motor 5 to rotate a unit angle and then stop, repeating the above process. Every unit time, the output shaft of the drive motor 5 controls the driving wheel 1 to rotate a unit angle and then stop, and the driving wheel 1 drives the cable 4 under test to advance a unit distance and then stop, repeating the above process.

[0032] Preferably, the driven wheel bracket 19 provides support for the driven wheel 3. A support shaft is fixed to the driven wheel bracket 19, and the driven wheel 3 is coaxially rotatably connected to the support shaft. An electromagnet 6 is fixed to the support shaft, and a metal ring is fixed to the inner circumference of the driven wheel 3. When energized, the electromagnet 6 magnetically attracts the metal ring to secure the driven wheel 3. Electromagnet 6 is connected to a microcontroller and relay 1. Specifically, the microcontroller is an Arduino controller. A digital pin of the Arduino controller is connected to the IN- pin of relay 1, and a 5V pin of the Arduino controller is connected to the IN+ pin of relay 1. The common terminal of relay 1 is connected to the negative terminal of the power supply, and electromagnet 6 is connected to the normally open contact of relay 1. The other end of electromagnet 6 is connected to the positive terminal of the power supply. Preferably, a freewheeling diode is connected to electromagnet 6. The microcontroller activates electromagnet 6 after a unit time of two and deactivates electromagnet 6 after a unit time of one. This causes the drive motor 5 to control the rotation of the driving wheel 1 after a unit time of one, and completes the rotation of the driving wheel 1 after a unit time of two.

[0033] The cable 4 to be tested is coaxially arranged with the detection tube 2. An insulation layer detection mechanism is provided in the detection tube 2. The insulation layer detection mechanism includes a plurality of detection electrodes 7; the plurality of detection electrodes 7 are evenly distributed in the detection tube 2 along the circumference of the detection tube 2. The detection electrode 7 includes an electrode group of a plurality of electrodes. In this embodiment, the electrode group is composed of electrode 1 8 and electrode 2 9; electrode 1 8, electrode 2 9, electromagnet 3 15 and a transistor constitute a detection circuit. Specifically, electrode 1 8 is connected to the positive pole of the power supply, electrode 2 9 is connected to a voltage divider resistor and then to ground; the base of the transistor is connected to the voltage divider point between electrode 2 9 and the voltage divider resistor; the collector of the transistor is connected to one end of electromagnet 3 15; the emitter of the transistor is connected to the emitter resistor and then to ground; the other end of electromagnet 3 15 is connected to the positive pole of the power supply. Preferably, a freewheeling diode is connected in parallel to electromagnet 3 15 to eliminate reverse electromotive force; a current limiting resistor is provided between the base of the transistor and electrode 2 9; and a filter capacitor is connected in parallel between the positive and negative poles of the power supply.

[0034] Specifically, the insulating layer between electrode 1 8 and electrode 2 9 constitutes an insulating layer resistor, which, together with the voltage divider resistor, forms a voltage divider circuit. When the insulating layer surface is intact, the insulating layer resistance is high, the voltage at the divider point between electrode 2 9 and the voltage divider resistor is low, and the current passing through electromagnet 3 15 is low. When the insulating layer surface is damaged, the insulating layer resistance is low, the voltage at the divider point increases, the current passing through electromagnet 3 15 increases, and the magnetism of the electromagnet is enhanced.

[0035] The inner circumference of the detection tube 2 is evenly distributed with a number of electrode holders 10 along its circumference, and the ends of electrode one 8 and electrode two 9 are slidably arranged in the electrode holders 10 respectively. The electrode holder 10 is provided with two electrode slots 11 for accommodating electrode one 8 and electrode two 9 respectively. The inner circumference of the electrode slot 11 is provided with a ring-shaped electromagnet 2; a tension spring is fixedly provided in the electrode holder 10, and the tension spring is fixedly connected to the end of the detection electrode 7, and is used to drive the detection electrode 7 to reset in the direction away from the cable to be tested 4. Electromagnet 2 is connected to the microcontroller through relay 2, and electromagnet 2 is connected to the normally open contact of relay 2, and the connection method between relay 2 and the microcontroller is the same as that of relay 1. The microcontroller controls electromagnet 2 to start after unit time two, and controls electromagnet 2 to turn off after unit time one, so that the detection electrode 7 contacts the cable to be tested 4 within unit time one, and separates from the cable to be tested 4 within unit time two.

[0036] An annular installation chamber 12 is provided in the detection tube 2. Several electromagnets 3 15 are evenly distributed on the inner side wall of the installation chamber 12 along the circumference of the detection tube 2. Several grooves are evenly distributed in the installation chamber 12 along the circumference of the detection tube 2, and the grooves are arranged axially along the detection tube 2; a slide rod 14 is slidably connected in the groove. A metal sheet is fixed to the end of the slide rod 14 close to the electromagnet 3 15, which is used for magnetic adsorption with the electromagnet 3 15; a reset spring 16 is fixed to the other end of the slide rod 14, and the reset spring 16 is fixed to the inner wall of the other end of the installation chamber 12, which is used to drive the slide rod 14 to reset in the direction away from the electromagnet 3 15. The longitudinal section of the slide rod 14 is a fan ring, and the side walls of two adjacent slide rods 14 away from the electromagnet 3 15 fit together. Preferably, the electromagnet 3 15 and the detection electrode 7 connected to the electromagnet 3 15 are located in the same axial direction of the detection tube 2; when the detection electrode 7 detects damage on the cable surface, the magnetic force of the electromagnet 3 15 corresponding to the detection electrode 7 increases.

[0037] Specifically, after the electromagnet 3 15 is energized, a current is generated according to the equivalent resistance generated by the contact between the detection electrode 7 and the insulating layer, and the electromagnet 3 15 generates a magnetic force according to the magnitude of the current. The magnitude of the magnetic force of the electromagnet 3 15 causes the slide bar 14 to overcome the elastic force of the reset spring 16 and move different distances. The insulating layer is divided into several insulating rings along its axial direction, and the resistance value of a single insulating ring along its circumference is basically the same, so that after the electromagnet 3 15 is energized, the movement distances of several slide bars 14 are basically the same. When damage occurs on the insulating ring, the resistance value of a certain point on the insulating ring decreases, and the movement distance of the slide bar 14 magnetically attracted to the electromagnet 3 15 increases. Preferably, a plurality of partitions 18 are fixed on the side wall of the installation chamber 12 where the electromagnet 3 15 is set. The partition 18 is set between two adjacent electromagnets 3 15. The partition 18 is made of soft magnetic material to reduce the magnetic field interference between two adjacent slots.

[0038] A marking assembly is provided on the detection electrode 7. This assembly includes a fixed tube 17 fixed between electrode 1 8 and electrode 2 9. A sliding shaft 13 slides within the fixed tube 17. A liquid outlet cap is fixed to one end of the sliding shaft 13 near the cable, and the cap has multiple liquid outlet holes. A liquid reservoir is fixed within the sliding shaft 13, containing absorbent fibers and ink, with the ink adhering to the absorbent fibers. The reservoir is connected to the liquid outlet cap. When the sliding shaft 13 moves, the liquid outlet cap contacts the cable surface, and pressure is applied to spray the ink from the outlet holes onto the cable surface. Preferably, the reservoir is longer than the absorbent fibers, and the end of the reservoir away from the liquid outlet cap has multiple air inlet holes. An electromagnet 4 is fixed to the wall of the fixed tube 17 of the sliding shaft 13. A metal ring is fixed around the side of the sliding shaft 13 for magnetic attraction with the electromagnet 4. Specifically, when electromagnet 4 is energized, it attracts the metal ring, causing the sliding shaft 13 to extend out of the fixed tube 17, toward the cable. A second return spring is fixedly disposed in the fixed tube 17 . The second return spring is fixedly connected to the end of the sliding shaft 13 and is used to drive the sliding shaft 13 to return to its original position in the fixed tube 17 .

[0039] A contact switch is provided between electromagnet four and the power supply. The contact switch is provided between two adjacent slide bars 14. Specifically, an electric sheet one is fixedly provided on one side wall of the slide bar, and an electric sheet two is fixedly provided on the side wall of the slide bar two. The electric sheet one is connected to the electromagnet four, and the electric sheet two is connected to the power supply. Preferably, the detection electrode 7 of the electromagnet four is provided in alignment with the slide bar. When the slide bar one and the slide bar two are flush with the end face of the electromagnet three 15, the electric sheet one is misaligned with the electric sheet two. In this embodiment, an insulating sheet is fixedly provided on the side wall of the slide bar two, which is aligned with the electric sheet; the electric sheet two is provided adjacent to the insulating sheet and is located on the side of the insulating sheet close to the electromagnet four. It should be noted that the length of the insulating sheet is longer than the length of the electric sheet one. If the movement distance of the slide bar one relative to the slide bar two is shorter, the electric sheet one is still in contact with the insulating sheet.

[0040] Specifically, when the detection electrode 7 contacts a single insulating ring, if the circumferential side of the insulating ring is intact, the current in the detection circuit formed after the detection electrode 7 around the insulating ring contacts the insulating ring is essentially the same; the slide bar 1 is attracted by the electromagnet 3 15 and moves; because the movement distances of several slide bars 14 are essentially the same, the contact switch set on the slide bar 14 is still in contact with the insulating sheet, and the contact switch is in the off state. If the circumferential side of the insulating ring is partially damaged, after the detection electrode 7 contacts the damaged location, the current flowing through the electromagnet 3 15 connected to the detection electrode 7 in the installation chamber 12 increases, and the electromagnet 3 15 increases the movement distance of the slide bar 14 by magnetically attracting the slide bar 14; after the slide bar 14 moves, the electromagnet 4 connected to the electric sheet 1 in the slide bar 14 is turned on, causing the slide shaft 13 on the detection electrode 7 at the damaged location to move, and the slide shaft 13 marks the surface of the cable 4 to be tested by contacting it. After unit time one, electromagnet two is de-energized, and the detection electrode 7 is separated from the surface of the cable to be tested 4; electromagnet three 15 is de-energized, and the reset spring 16 drives the slide rod 14 to reset; the contact switch is disconnected, and the reset spring 2 drives the slide shaft 13 to reset.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A cable detection device, characterized in that: include: A driving wheel (1), a driven wheel (3) and a detection tube (2); a cable to be tested (4) is wound around the driving wheel (1) and the driven wheel (3); and the cable to be tested (4) passes through the detection tube (2); Detection electrodes (7), a plurality of the detection electrodes (7) are arranged in the detection tube (2); Electromagnet three (15), the electromagnet three (15) is connected to the detection electrode (7), and the detection electrode (7) contacts the cable to be tested (4), so that the electromagnet three (15) generates a magnetic field; Slide bars (14) and contact switches, wherein a plurality of the slide bars (14) are slidably connected to the detection tube (2); the contact switch is arranged between two adjacent slide bars (14); A sliding shaft (13), the sliding shaft (13) being slidably connected to the detection electrode (7), and the sliding shaft (13) being used to mark the cable to be tested (4); Electromagnet 4, said electromagnet 4 being connected to said detection electrode (7), said electromagnet 4 being magnetically attracted to said sliding shaft (13); said electromagnet 4 being connected to said contact switch; A liquid storage tube is fixedly provided in the sliding shaft (13), and water-absorbing fibers and ink are provided in the liquid storage tube. After the sliding shaft (13) moves, the liquid outlet cover contacts the cable surface, and the ink is sprayed from the liquid outlet hole to the cable surface through pressure.

2. A cable detection device according to claim 1, characterized in that: It also includes a drive motor (5), the output shaft of the drive motor (5) being coaxially fixedly connected to the driving wheel (1).

3. The cable detection device according to claim 1, characterized in that: The driven wheel (3) is arranged on a driven wheel bracket (19); an electromagnet (6) is fixedly provided on the driven wheel bracket (19), and the electromagnet (6) fixes the driven wheel (3) by magnetic adsorption with the driven wheel (3).

4. A cable detection device according to claim 3, characterized in that: The electromagnet 1 (6) is connected to the microcontroller via relay 1.

5. The cable detection device according to claim 1, characterized in that: The detection electrode (7) includes an electrode 1 (8), an electrode 2 (9) and an electrode base (10), wherein the electrode 1 (8) and the electrode 2 (9) are connected to the electromagnet 3 (15) via a transistor; and the electrode 1 (8) and the electrode 2 (9) are respectively connected to the electrode base (10) in a sliding manner.

6. A cable detection device according to claim 5, characterized in that: The electrode seat (10) is provided with an electromagnet 2; the electrode 1 (8) and the electrode 2 (9) are magnetically attracted to the electromagnet 2 respectively; and the electromagnet 2 is connected to the microcontroller via a relay 2.

7. The cable detection device according to claim 1, characterized in that: An installation chamber (12) is provided in the detection tube (2), and the electromagnet (15) and the slide bar (14) are both arranged in the installation chamber (12); the installation chamber (12) is fixed with a return spring (16) connected to the slide bar (14).

8. A cable detection device according to claim 1 or 7, characterized in that: The contact switch comprises an electric sheet 1 and an electric sheet 2 respectively arranged on two adjacent sliding bars (14); when the two adjacent sliding bars (14) are misaligned, the electric sheet 1 and the electric sheet 2 are in electrical contact.

9. The cable detection device according to claim 1, characterized in that: A fixed tube (17) is fixed on the detection electrode (7), and the sliding shaft (13) is slidably connected to the fixed tube (17); a second reset spring is fixed on the fixed tube (17), and the second reset spring is connected to the sliding shaft (13).

10. The cable detection device according to claim 9, characterized in that: A liquid outlet cap is fixedly provided at one end of the sliding shaft (13); a liquid storage tube is fixedly provided inside the sliding shaft (13), and water-absorbing fibers and ink are provided inside the liquid storage tube.

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