CN108732460B

CN108732460B - Coil bare surface insulating layer damage detection device and detection method

Info

Publication number: CN108732460B
Application number: CN201810334946.XA
Authority: CN
Inventors: 危金兰
Original assignee: Yancheng Yangao Affordable Housing Construction Co ltd
Current assignee: Yancheng Yangao Affordable Housing Construction Co ltd
Priority date: 2014-04-16
Filing date: 2014-04-16
Publication date: 2021-01-15
Anticipated expiration: 2034-04-16
Also published as: CN108760816A; CN108760816B; CN108732460A; CN108593712A; CN104111275A; CN104111275B

Abstract

The invention relates to a coil detection apparatus and a detection method. The utility model provides a damaged detection device of coil bare surface insulating layer, is connected with electrically conductive clamp including the detection power, the one end of first wire, the other end of first wire are connected to the one end of detection power, and the other end of the one end of second wire, the other end of second wire are connected with electrically conductive brush hair bundle to the other end of detection power, and the cross-sectional area of the brush hair that constitutes brush hair bundle is below 0.4 square millimeter. Whether the coil is damaged or not is judged by removing the coil with the charged bristle bundle and judging whether the coil is ignited or not. The invention provides a device and a method for detecting damage of an exposed surface insulating layer of a coil, which can conveniently detect whether the exposed surface insulating layer of the coil is damaged, and overcome the defects of a method for directly observing whether the exposed surface insulating layer of the coil is damaged by eyes.

Description

Coil bare surface insulating layer damage detection device and detection method

The present application is a divisional application entitled "apparatus and method for detecting damage to an insulating layer on an exposed surface of a coil" having an application date of 2014, 04 and 16, and an application number of 2014101524911.

Technical Field

The invention relates to coil detection equipment and a detection method, in particular to a device and a method for detecting damage of an insulating layer on an exposed surface of a coil.

Background

The motor is commonly called as a motor and refers to an electromagnetic device for realizing electric energy conversion or transmission according to the law of electromagnetic induction. A motor is disclosed in chinese patent No. 93231403, entitled "motor" on publication date 5/11/1995. The structure of the motor as disclosed in this patent includes a housing, a stator fixed in the housing and a rotor located in the stator, the stator being composed of a core and coils (also called motor winding coils) mounted in the core. The existing coil detection mainly comprises the following steps: 1. direct current resistance: testing the direct current impedance and the impedance balance degree of the coil; 2. pressure resistance: testing voltage resistance between the coil and the iron core; 3. insulation resistance: testing the insulation resistance between the coil and the iron core to determine the insulation performance of the coil; 4. impulse impact of a coil: testing the insulation performance among coils of each turn and among interphase coils in the coil, and whether the enameled wire is damaged or not, and whether the enameled wire is too thin or not; 5. rotating direction: and testing the rotating magnetic field direction of the motor. Therefore, whether the coil insulation layer is damaged or not is tested by the coil pulse impact device. A device for detecting a damaged state of a coil is disclosed in a patent document entitled "a device for detecting coil pulse impact in a vacuum state" which is entitled as a device for detecting coil pulse impact in chinese patent No. 2012205049650 entitled 5/1/2013.

The existing device for detecting coil damage can only detect the damage of the non-exposed part of the coil (namely, between coils of each turn, between interphase coils, between coils and between the coils and an iron core in the coil), but the damage of an insulating layer on the exposed part surface of the coil (hereinafter, referred to as the exposed surface of the coil) is not detected, but when the insulating layer of the exposed part of the coil is damaged, after the coil is installed in a motor shell, the damaged part of the exposed surface of the coil can be contacted with adjacent components such as the motor shell, and the electrical performance and the safety of the motor are affected. The existing method for detecting whether the insulating layer on the exposed surface of the coil is damaged or not is to observe by visual inspection, but because the coil is made of copper wires, and the color of the copper wires is very close to that of the insulating layer, the detection is laborious, and the damaged part can not be found frequently, especially the damaged area is small.

Disclosure of Invention

The invention provides a device and a method for detecting damage of a coil exposed surface insulating layer, which can conveniently detect whether the coil exposed surface insulating layer is damaged, and solve the problems of labor-consuming detection and high omission ratio in the method for directly observing whether the coil exposed surface insulating layer is damaged by eyes.

The technical problem is solved by the following technical scheme: the utility model provides a damaged detection device of coil bare surface insulating layer, is including detecting the power, the one end of first wire is connected to the one end that detects the power the other end of first wire is connected with electrically conductive clamp, the one end of second wire is connected to the other end that detects the power the other end of second wire is connected with electrically conductive brush hair bundle, constitutes the cross-sectional area of the brush hair of brush hair bundle is below 0.4 square millimeter. During the use, with coil end insulating layer (for insulating paint) back of getting rid of through electrically conductive clamp centre gripping with first wire electric conductivity link together, open the detection power, then go to brush the coil exposed surface through the brush hair bundle, if the coil exposed surface has the breakage phenomenon, the spark can appear when the damage point is crossed in the brush hair touching in the brush hair bundle, whether there is the spark to spout through observing and judge whether there is the damage. Because the exposed surface of the coil is swept by the conductive bristle bundle, and the cross section area of the bristles is less than 0.4 square millimeter, damaged points with small areas can be found, detection can be performed by brushing for a plurality of times back and forth, and thus, the phenomenon of missed detection can hardly occur; whether the spark is damaged or not is judged, and labor is saved during observation.

Preferably, the conductive clamp comprises a pair of automatically foldable clamping pieces, the clamping pieces are provided with clamping surfaces, and the clamping surfaces are provided with scraper blades. When the conductive clamp is used, the coil end without the insulating layer being scraped is clamped in the conductive clamp and is in contact with the scraper blade, the coil end is pulled in the direction parallel to the plane perpendicular to the opening and closing direction of the conductive clamp, and the insulating layer is scraped by the scraper blade and is exposed when the coil end moves, so that the conductive contact between the coil end and the conductive clamp is realized. The convenience in stripping the insulating layer on the coil end is improved.

Preferably, the edge of the doctor blade on one clip is inclined toward the clamping surface on the other clip. The insulating layer at the end of the coil is convenient to strip; and in the process of stripping the insulating layer by pulling the coil end, the force for pulling the coil end can enable the pair of clamping pieces to generate the force for clamping the coil end, and the conductive clamp is prevented from opening without external force, so that the convenience in stripping the insulating layer is improved.

Preferably, a plurality of limiting grooves are formed in the clamping surface. The clamping effect of the conductive clamp on the coil end can be improved, so that the connection reliability between the conductive clamp and the coil end is good, and the accuracy of a detection result can be improved due to the good connection reliability.

The invention also includes a magnifying lens aligned with the bristle tufts. When the spark detector is used, the spark is observed through the magnifying lens, the spark is magnified, the spark can be found when the generated spark is small due to small damaged area or short detection time, and the effect of improving the accuracy and precision in detection is achieved.

The invention also comprises a supporting table, and the supporting table is provided with a coil rotating frame and a bristle bundle fixing mechanism. When the device is used, the coil is fixed on the coil rotating frame, and the coil is rotated through the coil rotating frame so as to change the positions of the coil and the bristle bundles, so that the device plays a role in improving the convenience in detection.

Preferably, the supporting table is further provided with a darkroom, the coil rotating frame and the bristle bundle fixing mechanism are both located in the darkroom, and the darkroom is provided with an observation window facing the bristle bundles. The darkroom is arranged, so that the spark can be observed when the brightness of the spark is low, and the effect of improving the accuracy and precision in detection is achieved.

The invention also comprises an oil filling device, the coil rotating frame comprises a bottom plate and a motor driving the bottom plate to rotate, a power output shaft of the motor is supported on a motor shell through a bearing, the oil filling device comprises an oil storage tank, an oil outlet channel, a membrane breaking rod and a corrosive liquid storage tank, the oil outlet channel is used for conveying lubricating oil in the oil storage tank to the bearing, the oil storage tank comprises at least two cavities which are sequentially sleeved and fixedly connected together, an oil outlet is formed in the lower side wall of each cavity, the oil outlet is hermetically connected with a sealing membrane, the membrane breaking rod extends in the vertical direction and is positioned below the oil storage tank, the membrane breaking rod and the oil outlets of all the cavities are positioned on the same vertical line, a periodical permeable floating barrel is arranged in the corrosive liquid storage tank, the periodical permeable floating barrel comprises a corrosion-resistant shell with an opening at the lower end and a plurality of partition plates which can be corroded by corrosive liquid in the corrosive liquid storage tank for a set time, the partition plate divides the shell into a plurality of floating chambers, the number of the floating chambers is equal to that of the cavities, the partition plate is distributed along the vertical direction, the oil storage tank floats on the corrosive liquid in the corrosive liquid storage tank through the floating barrels, and each floating chamber can independently float the oil storage tank; when the corrosion liquid in the corrosion liquid storage tank corrodes one floating chamber to cause the oil storage tank to descend once, the membrane breaking rod can only puncture the sealing membrane on one cavity. When the motor bearing lubricating oil filling device is used, lubricating oil is injected into each cavity, corrosive liquid capable of corroding and breaking the partition plate for a set time is filled into the corrosive liquid storage tank according to a required oil filling interval time (hereinafter referred to as a set time), when the time for pouring the corrosive liquid reaches a set time, the lowermost partition plate is corroded and broken, the corrosive liquid enters the lowermost floating chamber, the oil storage tank descends to float from the second floating chamber from bottom to top, a sealing film on the outermost cavity is punctured by the film breaking rod in the descending process, and the lubricating oil in the cavity flows out to lubricate the motor bearing; when the time for pouring the corrosive liquid reaches two preset times, the partition plate of the second layer from bottom to top is corroded and broken, the corrosive liquid enters the second floating chamber from bottom to top, the oil storage tank further descends to float through the third floating chamber from bottom to top, a sealing film on the cavity of the second layer from outside to inside is punctured by the film breaking rod in the descending process, and the lubricating oil in the cavity flows out to lubricate the motor bearing again; and analogizing in turn that all the partition plates are corroded and broken, and then replacing the automatic oiling device to automatically refuel again.

A method for detecting damage of an insulating layer on an exposed surface of a coil,

firstly, connecting the wire end of the coil with one end of a detection power supply in a conductive manner;

secondly, brushing the exposed surface of the coil by a conductive bristle bundle which is conductively connected with the other end of the detection power supply;

and thirdly, observing whether electric sparks are generated between the bristle bundles and the coil in the process of brushing the exposed surface of the coil by the bristle bundles, wherein if the electric sparks are generated, the electric sparks indicate that the insulating layer on the exposed surface of the coil is damaged.

Preferably, in the second step, the bristle bundle is fixed by a bristle bundle fixing mechanism, the coil is fixed by a coil rotating frame, and the position of the coil, which is contacted with the bristle bundle, is changed by rotating the coil, wherein the coil and the bristle bundle are both positioned in a darkroom, the darkroom is provided with an observation window, and the observation window is provided with a magnifying lens aligned with the bristle bundle; and in the third step, whether the electric spark is generated or not is observed through a magnifying lens.

The invention has the following advantages: the conductive bristle bundles sweep the exposed surface of the coil, so that the conductive bristle bundles can contact the bristles when a damaged point is small to generate a sparking phenomenon, and the missing rate can be reduced; whether the spark is damaged or not is judged, and labor is saved during observation.

Drawings

Fig. 1 is a schematic diagram of a detection apparatus according to a first embodiment of the invention.

Fig. 2 is a schematic view illustrating a usage status of a detection apparatus according to a first embodiment of the invention.

Fig. 3 is a schematic diagram of a detection apparatus according to a second embodiment of the invention.

Fig. 4 is an enlarged perspective view of a conductive clip according to a second embodiment of the invention.

Fig. 5 is a schematic view of a usage status of the detecting device in the second embodiment of the invention.

Fig. 6 is a schematic diagram illustrating the stripping of the insulating layer of the coil end by the conductive clip according to the second embodiment.

Fig. 7 is an enlarged schematic view of the refueling device in the third embodiment.

Fig. 8 is a schematic view of the oiling device corroding and breaking a float chamber.

FIG. 9 is a schematic view showing the case where the refueling apparatus corrodes two float chambers.

In the figure: the detection device comprises a detection power supply 1, a first lead 11, a second lead 12, a conductive clamp 2, a pair of clamping pieces 21, a first clamping piece 21-1, a second clamping piece 21-2, a hinge 22, a clamping surface 23, a limiting groove 231, a scraper 232, a cutting edge 2321 of the scraper, a handle 24, a bristle bundle 3, a coil 4, a coil end 41, a coil exposed surface 42, an iron core 43, a supporting table 5, a dark room 51, an observation window 511, a coil rotating frame 52, a bottom plate 521, a positioning column 522, a motor 523, a power output shaft 5231, a motor housing 5232, a bristle bundle fixing mechanism 53, an amplifying lens 54, an oil storage tank 91, a cavity 911, an oil outlet 912, a sealing membrane 913, an oil outlet channel 92, an oil inlet hopper 921, a membrane breaking rod 93, a periodically corrosive liquid storage tank 94, a corrosive liquid permeable type buoy 95, a housing 951, a partition 952, a floating chamber 953, a guide rod 96, a.

Detailed Description

The invention is further described with reference to the following figures and examples.

First embodiment, referring to fig. 1, a device for detecting damage of an insulating layer on an exposed surface of a coil includes a detection power source 1, a conductive clip 2, and a bristle bundle 3.

The conductive clip 2 is connected to one end of the detection power supply 1 through a first wire 11. The conductive clip 2 includes a pair of clip pieces 21. Two clamping pieces of the pair of clamping pieces 21 are a first clamping piece 21-1 and a second clamping piece 21-2 respectively. The middle parts of the first clamping piece 21-1 and the second clamping piece 21-2 are hinged together through a hinge shaft 22. Two of the pair of clamping pieces 21 are provided with a clamping surface 23 at one end and a handle 24 at the other end. The holding surface 23 is provided with a plurality of limiting grooves 231.

The conductive clip 2 further includes a clip closing spring (not shown) for closing the clamping surfaces 23 of the first clamping piece 21-1 and the second clamping piece 21-2 together (i.e., closing the clip). The clamping spring is a torsion spring and is sleeved on the hinge shaft 22. It is of course also possible to achieve self-closing by resiliently connecting together a pair of jaws in an integral structure.

The bristles in the bristle bundle 3 are made of conductive material, and the cross-sectional area of the bristles is less than 0.4 square millimeter. The bundle of bristles 3 is electrically connected to the other end of the inspection power source 1 through a second conductive wire 12.

The method for detecting the damage of the insulating layer on the exposed surface of the coil by the device for detecting the damage of the insulating layer on the exposed surface of the coil comprises the following steps:

referring to fig. 2, the coil 4 is mounted on a core 43, and the coil 4 is provided with coil ends 41.

Firstly, removing the insulating layer on the coil end 41, opening the conductive clip 2 by oppositely pressing the handle 24 on the first clamping piece 21-1 and the second clamping piece 21-2, and positioning the coil end 41 between the first clamping piece 21-1 and the second clamping piece 21-2 in a manner that the removed insulating layer of the coil end 41 faces the clamping surface 23, releasing the pressing and holding action on the handle 24, and automatically closing the first clamping piece 21-1 and the second clamping piece 21-2 to clamp the coil end 41 and contact the removed insulating layer of the coil end 41, thereby realizing the electrical connection of the coil end 41 and the detection power supply 1.

In the second step, the detection power supply 1 is turned on, and then the coil exposed surface 42 (i.e., the surface of the portion of the coil 4 outside the iron core 43) is brushed by the bundle of bristles 3. In order to improve the accuracy of the detection, the bristle bundles 3 brush the exposed coil surface 42 back and forth, and the same portion of the exposed coil surface 42 is brushed at least twice (once each time, twice brushing is referred to as back and forth brushing).

And a third step of observing whether or not an electric spark is generated between the bristle bundle 3 and the coil 4 in the process of brushing the exposed surface 42 of the coil with the bristle bundle 3, wherein if the electric spark is generated, the damage of the insulating layer of the exposed surface 42 of the coil is indicated.

In the second embodiment, the detecting apparatus is different from the first embodiment in that:

referring to fig. 3, a support stand 5 is also provided. The support base 5 is provided with a darkroom 51. The dark room 51 has a hood-like structure. The dark room 51 is directly placed on the support 5, but may be fixed to the support and provided with a door. The support table 5 is further provided with a coil rotating frame 52 and a bristle bundle fixing mechanism 53. The bundle of bristles 3 is fixed to the bundle of bristles fixing mechanism 53 (the bundle of bristles 3 is electrically connected to the detection power source 1 through the second conductive wire 12). The bristle bundle fixing mechanism 53 is connected to the inside of the dark room 51 by a universal joint. The orientation of the bristle bundles 3 can be adjusted by means of a cardan joint. The bundle of bristles 2 is located at the upper end of the dark room 51. The dark room 51 is provided with an observation window 511 facing the bundle of bristles 3. The viewing window 511 is provided with magnifying lenses 54 aligned with the bristle bundles. The coil rotating frame 52 includes a base plate 521 and a motor 523. The bottom plate 521 is provided with a positioning column 522. A magnet is provided on the bottom plate 521. The motor 523 includes a power output shaft 5231 and a motor housing 5232. The power output shaft 5231 is rotatably coupled to the motor housing 5232 by bearings. The base plate 521 is fixed to the power output shaft 5231. The motor housing 5232 is fixed to the support table 5. The coil rotating frame 52 is located in the dark room 51. The orientation and alignment in this section are intended to mean that the bristle tufts are visible through the viewing window.

Referring to fig. 4, a doctor blade 232 is provided on the clamping surface 23. The cutting edge 2321 of the doctor blade on the first clamping piece 21-1 is inclined toward the clamping surface 23 of the second clamping piece 21-2, and the cutting edge 2321 of the doctor blade on the second clamping piece 22-1 is inclined toward the clamping surface 23 of the first clamping piece 21-1. The scraper blade 232 is located at one end of the clamping surface 23 close to the hinge 22 (i.e. the scraper blade 232 is located at one end of the clamping surface 23 close to the hinge of two clips of a pair of clips), and the beneficial effects of the design are that: even if a force (hereinafter referred to as a separating force) for separating the first clip piece 21-1 and the second clip piece 21-2 is generated in the process of pulling the coil end, the moment for separating the conductive clip generated by the separating force is small, so that the convenience and labor saving in the process of stripping the insulating layer of the coil end are realized.

The detecting device is different from the first embodiment in that:

referring to fig. 5, in a second step, the coil 4 is fixed by the coil rotating frame 52 and rotated to change the position of the coil contacting the bundle of bristles 3. The specific operation process is as follows: the coil 4 is fitted over the positioning post 522 and placed on the base plate 521 (in the figure, a gap is drawn between the base plate and the lower section of the coil 4 in order to see the positioning post 522, and the coil 4 is not actually present), the coil 4 is attracted and fixed by the magnet on the base plate 521, and the position of the bristle bundle 3 is adjusted so that the bristle bundle 3 contacts with the portion of the exposed surface 42 of the coil above the iron core 43 and contacts with the bristle bundle 3. The dark room 51 is covered on the coil 4. The motor 523 is rotated positively to brush the respective portions of the portion of the coil exposed surface 42 located above the iron core 43 with the bundle of bristles 3. In the third step, the presence or absence of the spark is observed by the magnifying glass 54.

The coil 4 is turned around in the up-down direction, and the detection of the portion of the coil exposed surface 42 located below the core 43 is completed by the aforementioned method.

Referring to fig. 6, the method for removing the insulating layer on the coil end in the first step is as follows: the coil end 41 is positioned between the doctor blades 232 of the first clamping pieces 21-1 and 21-2, the two doctor blades 232 are clamped on the coil end 41 when the clip is automatically closed, and then the insulating layer on the coil end 41 is stripped off along the direction A of the coil end 41 in the figure by the cutting edge 2321 of the doctor blades. After stripping, the coil end 41 can be kept at the current position and can also be moved to the portion of the clamping surface 23 where the position-limiting groove 231 is provided. If the detection voltage is higher, the part, provided with the limiting groove 231, of the clamping surface 23 is adopted, so that the cutting edge 2321 of the scraper blade is not easily burnt out, and the cutting edge 2321 of the scraper blade can be kept sharp for a long time.

The third embodiment is different from the second embodiment in that:

referring to fig. 7, a refueling device is also included. The oil filling device comprises an oil storage tank 91, an oil outlet channel 92, a membrane breaking rod 93, a corrosive liquid storage tank 94, a periodically corrosive type float bowl 95 and a guide rod 96.

The oil tank 91 is connected to a periodically decaying float 95 by a connecting rod 98. The connecting rod 98 and the periodically decaying pontoon 95 are detachably connected together by bolts. The oil storage tank 91 includes at least two cavities 911, which are sequentially sleeved and fixedly connected together in this embodiment. The cavity 911 is filled with a lubricant (not shown in the lubricant diagram). An oil outlet 912 is arranged on the lower side wall of the cavity 911. The oil outlet 912 is hermetically connected with a sealing film 913. The total 4 oil outlets 912 of the 4 cavities are positioned on the same vertical straight line and are positioned right above the membrane breaking rod 93. The distance between adjacent sealing films is equal.

One end of the oil outlet passage 92 is provided to be butted with a bearing that supports the power output shaft 5231 (see fig. 3) in the motor housing 5232 (see fig. 3). The other end of the oil outlet channel 92 is provided with an oil inlet bucket 921 positioned below the oil storage tank. The oil inlet bucket 921 is fixed to the support table 5.

The membrane rupturing rod 93 extends in the vertical direction. The lower end of the membrane rupturing rod 93 is connected in the oil inlet bucket 921. The membrane rupturing rod 93 is positioned below the oil storage tank 91.

The etching liquid storage tank 94 is located below the oil storage tank 91. The etching liquid storage tank 94 is fixed to the support table 5.

Periodically eroding pontoons 95 are located within the tank 94. The periodically corrosive buoy 95 comprises a corrosive resistant outer shell 951 with an open lower end and four partition plates 952. The partition 952 is an aluminum plate. The partition 952 is distributed in the up-down direction. The partition 952 divides the housing 951 into 4 floating chambers 953 distributed in the up-down direction. The distance between adjacent partitions is equal. The distance between adjacent spacers is equal to the distance between adjacent sealing membranes.

The guide bar 96 extends in the vertical direction. One end of the guide rod 96 is fixedly connected to the oil tank 91. The oil tank 91 is higher than the bearing. The other end of the guide rod 96 is slidably inserted through the support table 5.

Referring to fig. 8, when the refueling device is to be started, the corrosive liquid 97 is filled into the corrosive liquid storage tank 94, the corrosion-type buoy 95 is floated periodically by the corrosive liquid 97 to realize the floating of the oil outlet tank 91, and the corrosive liquid is stopped from being added when the oil outlet tank 91 is floated to a state that the distance between the membrane breaking rod 93 and the sealing membrane positioned in the outermost cavity is smaller than the distance between the adjacent sealing membranes. The buoyancy generated by each buoyancy chamber 953 can independently float the oil tank 91. In this embodiment, the etching solution 97 is a sodium hydroxide solution. By controlling the concentration of the corrosive liquid 97 or/and the thickness of the separator, the separator is corroded by the corrosive liquid 97 for a set time period, and the data can be obtained through experiments.

When the time for pouring the corrosive liquid 97 reaches a set time, the partition plate at the lowest position in the partition plate 952 is corroded and broken, the corrosive liquid enters the floating chamber at the lowest position in the floating chamber 953, the oil storage tank 91 descends to float through the second floating chamber from bottom to top in the floating chamber 953, the sealing membrane 913-1 in the outermost cavity is punctured by the membrane breaking rod 93 in the descending process, and the lubricating oil in the outermost cavity in the cavity 911 flows into the oil outlet channel 92 from the corresponding oil outlet so as to automatically lubricate the bearing once.

Referring to fig. 9, when the time for pouring the corrosive liquid 97 reaches two preset times, the next lower partition in the partition 952 is also corroded and broken, the corrosive liquid enters the next lower floating chamber in the floating chamber 953, the oil storage tank 91 descends to pass through the third floating chamber from bottom to top in the floating chamber 953 to float, the sealing membrane in the next outer layer cavity is also punctured by the membrane breaking rod 93 in the descending process, and the lubricating oil in the next outer layer cavity in the cavity 911 flows out from the oil outlet on the next outer layer cavity and the oil outlet in the outermost layer cavity and then drips into the oil outlet channel 92 to automatically lubricate the bearing for the second time; analogize in proper order, can carry out the lubrication of quartic automatic oiling in this embodiment, then change automatic oiling device and carry out the lubrication of automatic oiling again.

Claims

1. The utility model provides a damaged detection device of coil bare surface insulating layer, its characterized in that, including detection power, brace table and filling device, the one end of first wire is connected to the one end of detection power, the other end of first wire is connected with electrically conductive clamp, the one end of second wire is connected to the other end of detection power, the other end of second wire is connected with electrically conductive brush hair bundle, constitutes the cross-sectional area of brush hair that brush hair bundle is below 0.4 square millimeter, the brace table is equipped with coil swivel mount and brush hair bundle fixed establishment, the coil swivel mount includes bottom plate and driving bottom plate pivoted motor, the power output shaft of motor passes through the bearing and supports in motor housing, filling device includes oil storage tank, goes out oil passageway, broken membrane pole and corrosive liquid bin, it is used for with lubricating oil in the oil storage tank carries the bearing, the oil storage tank comprises at least two cavities which are sequentially sleeved and fixedly connected together, an oil outlet is arranged on the lower side wall of the cavity, the oil outlet is hermetically connected with a sealing film, the film breaking rod extends along the vertical direction and is positioned below the oil storage tank, the membrane breaking rod and the oil outlets of all the cavities are positioned on the same vertical line, a periodical corrosion type floating cylinder is arranged in the corrosive liquid storage tank, the periodically corrosive type float bowl comprises a corrosion-resistant shell with an opening at the lower end and a plurality of clapboards which are corroded and broken by corrosive liquid in the corrosive liquid storage tank for a set time, the partition plate divides the outer shell into a plurality of floating chambers, the number of the floating chambers is equal to that of the cavities, the partition plates are distributed along the up-down direction, the oil storage tank floats on the corrosive liquid in the corrosive liquid storage tank through the floating barrels, and each floating chamber can independently float the oil storage tank; the corrosion liquid in the corrosion liquid bin is corroded every time and is broken a float chamber and lead to the in-process that the oil storage tank descends one time broken membrane pole can only puncture the seal membrane on a cavity, the brace table still is equipped with the darkroom, coil swivel mount and brush hair bundle fixed establishment all are located in the darkroom, the darkroom is equipped with the orientation the observation window of brush hair bundle.

2. The apparatus of claim 1, wherein the conductive clip comprises a pair of automatically foldable clips, the clips having a clamping surface with a scraper blade.

3. The apparatus of claim 2, wherein the edge of the scraper blade of one clip is inclined toward the clamping surface of the other clip.

4. The apparatus for detecting damage of an insulating layer on an exposed surface of a coil according to claim 2 or 3, wherein a plurality of limiting grooves are formed on the clamping surface.