Cable detection equipment

Abstract

The invention relates to cable detection equipment, and belongs to the technical field of cable insulation layer fault detection, the cable detection equipment comprises a driving wheel, a driven wheel and a detection pipe, and a cable to be detected is wound on the driving wheel and the driven wheel; a to-be-detected cable passes through the detection tube; the plurality of detection electrodes are arranged in the detection tube; after the detection electrode is in contact with the cable to be detected, the electromagnet III generates a magnetic field; the plurality of sliding rods are in sliding connection with the detection tube; the contact switch is arranged between two adjacent sliding rods; the sliding shaft is in sliding connection with the detection electrode and is used for marking the to-be-detected cable; the fourth electromagnet is fixedly arranged on the detection electrode and connected with the contact switch. The method has the effect of improving the detection efficiency of the resistance value of the insulating 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 power supply safety and cable life. In the prior art, manual visual inspection is usually used to inspect the outer skin of the cable, but it is inefficient and has accuracy deviations. 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 dielectric, which reduces the local resistance value. By constructing a measurement loop 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 The fixed reference value insulation layer resistance detection system has the following defects: the cable body resistance is significantly affected by the temperature coefficient, resulting in a reference offset, and a compensation coefficient needs to be added to the threshold according to different temperature environments; humidity will also cause the insulation layer resistance to fluctuate, overlapping with the frequency band of the real damage signal. Therefore, the fixed threshold detection method needs to correct the threshold coefficient according to the specific environment, and there are also false alarms, which seriously affects the efficiency of cable insulation layer fault detection. Summary of the invention

[0003] In order to improve the problem of low efficiency of a fixed threshold resistance value measurement method, the present application provides a cable detection device.

[0004] The present application provides a cable detection device that adopts the following technical solution: A cable detection device comprises a driving wheel, a driven wheel and a detection tube, wherein 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; Detection electrodes, a plurality of the detection electrodes are arranged in the detection tube; Electromagnet three, wherein the electromagnet three is connected to the detection electrode, and the detection electrode makes the electromagnet three generate a magnetic field after contacting the cable to be tested; Slide bars and contact switches, wherein a plurality of the slide bars are slidably connected to the detection tube; the contact switch is arranged between two adjacent slide bars; A sliding shaft, the sliding shaft is slidably connected to the detection electrode, and the sliding shaft is used to mark the cable to be tested; 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.

[0005] Optionally, a driving motor is further included, and an output shaft of the driving motor is coaxially fixedly connected to the driving wheel.

[0006] Optionally, the driven wheel is arranged on a driven wheel bracket; an electromagnet 1 is fixedly provided on the driven wheel bracket, and the electromagnet 1 fixes the driven wheel by magnetic adsorption with the driven wheel.

[0007] Optionally, the electromagnet is connected to a microcontroller via a relay.

[0008] Optionally, the detection electrode includes electrode one, electrode two and an electrode seat, and the electrode one and the electrode two are connected to the electromagnet three through a transistor; the electrode one and the electrode two are slidingly connected to the electrode seat respectively.

[0009] Optionally, an electromagnet 2 is provided on the electrode seat; the electrode 1 and the electrode 2 are magnetically attracted to the electromagnet 2 respectively; and the electromagnet 2 is connected to the microcontroller via a relay 2.

[0010] Optionally, an installation chamber is opened in the detection tube, and the electromagnet three and the slide rod are both arranged in the installation chamber; the installation chamber is fixed with a reset spring one connected to the slide rod.

[0011] Optionally, the contact switch includes an electric sheet 1 and an electric sheet 2 respectively arranged 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.

[0012] Optionally, a fixed tube is fixedly provided on the detection electrode, and the sliding shaft is slidably connected to the fixed tube; a second reset spring is fixedly provided on the fixed tube, and the second reset spring is connected to the sliding shaft.

[0013] 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 inside the liquid storage tube.

[0014] In summary, the present application includes at least one of the following beneficial technical effects: 1. The stepper motor drives the active wheel to rotate in steps at intervals of unit time 1, and cooperates with electromagnet 1 to lock the driven wheel within unit time 2, so as to achieve intermittent and precise axial movement of the cable to be tested. The detection electrode contacts the surface when the cable to be tested is stationary to eliminate motion interference.

[0015] 2. The detection electrode group and the surface of the cable to be tested form a voltage divider circuit. The change in the insulation layer resistance is amplified by the transistor and drives the electromagnet three to generate a gradient magnetic force. The displacement of the slider is negatively correlated with the resistance value. The displacement of the slider directly maps the degree of damage, reduces the interference of the resistance value fluctuation caused by the fixed threshold, and reduces the false alarm rate.

[0016] 3. When the slide rod is displaced beyond the limit due to the signal of insulation layer damage, its side wall contact switch is turned on, the electromagnet four adsorption slide shaft compresses the liquid storage tube, and the ink is sprayed to the damage point through the liquid outlet hole; the magnetic control marking component is linked with the detection signal in real time to improve the response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the cable detection device according to the embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of the structure of the detection electrode of the embodiment of the present application.

[0019] Figure 3 It is a cross-sectional view of the detection tube according to the embodiment of the present application.

[0020] 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. installation 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

[0021] The following is combined with Figure 1-3 This application is described in further detail.

[0022] The embodiment of the present application discloses a cable detection device. The cable detection device includes a wire wheel and a detection tube 2. The wire wheel includes a driving wheel 1 and a driven wheel 3 respectively arranged at both ends of the detection tube 2, and a cable 4 to be tested is wound around the driving wheel 1 and the driven wheel 3, and the cable 4 to be tested passes through the detection tube 2. A driving motor 5 is fixed on the wheel frame of the driving wheel 1, and the output shaft of the driving motor 5 is coaxially fixed to the driving wheel 1, and is used to drive the driving wheel 1 to rotate; the driving motor 5 is a stepping motor.

[0023] Specifically, the drive motor controller sends a pulse signal to the drive motor 5 every unit time, so that the output shaft of the drive motor 5 rotates a unit angle and then stops rotating, and the above process is repeated. Every unit time, the output shaft of the drive motor 5 controls the driving wheel 1 to rotate a unit angle and stop rotating, and the driving wheel 1 drives the cable 4 to be tested to move forward a unit distance and then stop, and the above process is repeated continuously.

[0024] Preferably, the driven wheel bracket 19 provides support for the driven wheel 3. A support shaft is fixed on the driven wheel bracket 19, and the driven wheel 3 is coaxially connected to the support shaft. An electromagnet 6 is fixed on the support shaft, and a metal ring is fixed on the inner circumference of the driven wheel 3; the electromagnet 6 is energized to fix the driven wheel 3 through the magnetic adsorption metal ring. The electromagnet 6 is connected to the microcontroller and the relay 1, specifically, the microcontroller is an Arduino controller; the digital pin of the Arduino controller is connected to the IN- pin of the relay 1, and the 5V pin of the Arduino controller is connected to the IN+ pin of the relay 1; the common end of the relay 1 is connected to the negative pole of the power supply, the electromagnet 6 is connected to the normally open contact of the relay 1, and the other end of the electromagnet 6 is connected to the positive pole of the power supply; preferably, a freewheeling diode is connected to the electromagnet 6. The microcontroller controls the electromagnet 6 to start after a unit time of two, and controls the electromagnet 6 to turn off after a unit time of one; so that the drive motor 5 controls the driving wheel 1 to rotate after a unit time of one, and completes the rotation action of the driving wheel 1 after a unit time of two.

[0025] The cable 4 to be tested is coaxially arranged with the detection tube 2. An insulating layer detection mechanism is arranged in the detection tube 2. The insulating 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 the present embodiment, the electrode group is composed of electrode one 8 and electrode two 9; electrode one 8, electrode two 9, electromagnet three 15 and a transistor constitute a detection circuit. Specifically, electrode one 8 is connected to the positive pole of the power supply, electrode two 9 is connected to the voltage dividing resistor and then grounded; the base of the transistor is connected to the voltage dividing point between electrode two 9 and the voltage dividing resistor; the collector of the transistor is connected to one end of electromagnet three 15; the emitter of the transistor is connected to the emitter resistor and then grounded; the other end of electromagnet three 15 is connected to the positive pole of the power supply. Preferably, electromagnet three 15 is connected in parallel with a freewheeling diode to eliminate reverse electromotive force; a current limiting resistor is set between the base of the transistor and electrode two 9; and a filter capacitor is connected in parallel between the positive and negative poles of the power supply.

[0026] Specifically, the insulating layer between the electrode 1 8 and the electrode 2 9 constitutes an insulating layer resistor, and the insulating layer resistor and the voltage divider resistor constitute a voltage divider circuit. When the surface of the insulating layer is intact, the insulating layer resistance is large, the voltage at the voltage divider point between the electrode 2 9 and the voltage divider resistor is small, and the current passing through the electromagnet 3 15 is small; when the surface of the insulating layer is damaged, the insulating layer resistance is small, the voltage at the voltage divider point increases, the current passing through the electromagnet 3 15 increases, and the magnetism of the electromagnet is enhanced.

[0027] The inner circumference of the detection tube 2 is evenly distributed with a number of electrode seats 10 along its circumference, and the ends of the electrode 1 8 and the electrode 2 9 are respectively slidably arranged in the electrode seats 10. The electrode seat 10 is provided with two electrode slots 11 for accommodating the electrode 1 8 and the electrode 2 9 respectively. The inner circumference of the electrode slot 11 is provided with a ring-shaped electromagnet 2; a tension spring is fixedly arranged in the electrode seat 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 a direction away from the cable 4 to be tested. The electromagnet 2 is connected to the microcontroller through the relay 2, and the electromagnet 2 is connected to the normally open contact of the relay 2, and the connection mode between the relay 2 and the microcontroller is the same as that of the relay 1. The microcontroller controls the electromagnet 2 to start after the unit time 2, and controls the electromagnet 2 to close after the unit time 1, so that the detection electrode 7 contacts with the cable 4 to be tested within the unit time 1, and separates from the cable 4 to be tested within the unit time 2.

[0028] An annular installation chamber 12 is provided in the detection tube 2. Several electromagnets 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 bar 14 is slidably connected in the groove. A metal sheet is fixedly provided at one end of the slide bar 14 close to the electromagnet 3 15, which is used for magnetic adsorption with the electromagnet 3 15; a reset spring 16 is fixedly provided at the other end of the slide bar 14, and the reset spring 16 is fixedly connected to the inner wall of the other end of the installation chamber 12, which is used to drive the slide bar 14 to reset in the direction away from the electromagnet 3 15. The longitudinal section of the slide bar 14 is a fan ring, and the side walls of two adjacent slide bars 14 away from the electromagnet 3 15 fit each other. Preferably, the electromagnet three 15 and the detection electrode 7 connected to the electromagnet three 15 are located on 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 three 15 corresponding to the detection electrode 7 increases.

[0029] Specifically, after the electromagnet three 15 is energized, a current is formed according to the equivalent resistance generated by the detection electrode 7 contacting the insulating layer, and the electromagnet three 15 generates a magnetic force according to the magnitude of the current. The magnitude of the magnetic force of the electromagnet three 15 causes the slide bar 14 to overcome the elastic force of the reset spring one 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 three 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 adsorbed with the electromagnet three 15 increases. Preferably, a plurality of partitions 18 are fixedly provided on the side wall of the installation chamber 12 where the electromagnet three 15 is set, and the partition 18 is set between two adjacent electromagnets three 15. The partition 18 is made of soft magnetic material to reduce the magnetic field interference between two adjacent slots.

[0030] The detection electrode 7 is provided with a marking component. The marking component includes a fixed tube 17 fixed between the electrode 1 8 and the electrode 2 9, and a sliding shaft 13 is slidably provided in the fixed tube 17. A liquid outlet cover is fixedly provided near one end of the sliding shaft 13, and a plurality of liquid outlet holes are provided on the liquid outlet cover. A liquid storage tube is fixedly provided in the sliding shaft 13, and a water-absorbing fiber and ink are provided in the liquid storage tube, and the ink is attached to the water-absorbing fiber; the liquid storage tube is connected with the liquid outlet cover. After the sliding shaft 13 moves, the liquid outlet cover contacts the surface of the cable, and the ink is sprayed from the liquid outlet hole to the surface of the cable through the pressure. Preferably, the length of the liquid storage tube is longer than the length of the water-absorbing fiber, and a plurality of air inlet holes are provided at the end of the liquid storage tube away from the liquid outlet cover. An electromagnet 4 is fixedly provided on the tube wall of the fixed tube 17 of the sliding shaft 13. A metal ring is fixedly provided on the peripheral side of the sliding shaft 13 for magnetic adsorption with the electromagnet 4. Specifically, after the electromagnet 4 is energized, the sliding shaft 13 is extended out of the fixed tube 17 in the direction close to the cable by adsorbing the metal ring. 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 for driving the sliding shaft 13 to return to the fixed tube 17 .

[0031] 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 arranged in alignment with the slide bar. When the end faces of the slide bar one and the slide bar two are flush away from the electromagnet three 15, the electric sheet one is misaligned with the electric sheet two. In this embodiment, an insulating sheet aligned with the electric sheet is fixedly provided on the side wall of the slide bar two; the electric sheet two is arranged 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 moving 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.

[0032] Specifically, when the detection electrode 7 contacts a single insulating ring, if the insulating ring circumferential side is intact, the current in the detection circuit formed after the detection electrode 7 around the insulating ring contacts the insulating ring is basically the same; the slide bar 1 is attracted by the electromagnet 3 15 to move; since the movement distances of several slide bars 14 are basically 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 a disconnected state. If the insulating ring circumferential side is partially damaged, after the detection electrode 7 contacts the damaged position, the current passing 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 adsorbing 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, so that the slide shaft 13 on the detection electrode 7 at the damaged position moves, and the slide shaft 13 is marked by contacting the surface of the cable 4 to be tested. After a unit time, electromagnet 2 is powered off, and the detection electrode 7 is separated from the surface of the cable 4 to be tested; electromagnet 3 15 is powered off, and reset spring 1 16 drives the slide bar 14 to reset; the contact switch is disconnected, and reset spring 2 drives the slide shaft 13 to reset.

[0033] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope 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), wherein 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) being arranged in the detection tube (2); Electromagnet three (15), the electromagnet three (15) being connected to the detection electrode (7), and the detection electrode (7) causing the electromagnet three (15) to generate a magnetic field after contacting the cable to be tested (4); A sliding rod (14) and a contact switch, wherein a plurality of the sliding rods (14) are slidably connected to the detection tube (2); the contact switch is arranged between two adjacent sliding rods (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 four, the electromagnet four is connected to the detection electrode (7), the electromagnet four is magnetically attracted to the sliding shaft (13); the electromagnet four is connected to the contact switch.

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

3. A 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 arranged on the driven wheel bracket (19); 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 a relay 1.

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

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

7. A cable detection device according to claim 1, characterized in that: An installation chamber (12) is provided in the detection tube (2), and the electromagnet three (15) and the slide bar (14) are both arranged in the installation chamber (12); the installation chamber (12) is fixed with a return spring one (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. A cable detection device according to claim 1, characterized in that: A fixed tube (17) is fixedly provided on the detection electrode (7), and the sliding shaft (13) is slidably connected to the fixed tube (17); a second return spring is fixedly provided on the fixed tube (17), and the second return spring is connected to the sliding shaft (13).

10. A 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 arranged inside the liquid storage tube.

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