CN110823993B - Wire rope damage detection system - Google Patents
Wire rope damage detection system Download PDFInfo
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- CN110823993B CN110823993B CN201911174062.3A CN201911174062A CN110823993B CN 110823993 B CN110823993 B CN 110823993B CN 201911174062 A CN201911174062 A CN 201911174062A CN 110823993 B CN110823993 B CN 110823993B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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Abstract
The invention discloses a steel wire rope damage detection system, and belongs to the field of equipment detection. The steel wire rope damage detection system comprises a detector body and detection elements, wherein the detector body comprises a first detector body, a second detector body and an elastic device for adjusting the distance between the first detector body and the second detector body, and the detection elements are arranged in the first detector body and the second detector body; the detection element comprises an armature arranged in the first detector body and/or the second detector body and a bushing fixedly connected with the armature, a first groove and a second groove are formed in the bushing, and a Hall sensor and a permanent magnet are respectively arranged in the first groove and the second groove; and pulley devices for fixing the steel wire rope are respectively arranged at two ends of the detector body. The invention can ensure that the distance between the detection surface and the outer surface of the steel wire rope is not changed in the process of detecting the steel wire ropes with different diameters.
Description
Technical Field
The invention relates to the field of equipment detection, in particular to a steel wire rope damage detection system.
Background
The steel wire rope is a main bearing component in engineering, and is widely applied to departments of coal mines, metallurgy, traffic, buildings, tourism and the like at present. Although the steel wire rope has the advantages of high strength, light dead weight, stable work and the like, the steel wire rope can be broken or have other defects due to fatigue after long-term use, and potential risks exist, so that the steel wire rope needs to be regularly detected. The traditional steel wire rope detection method comprises the following steps: visual inspection, detection of internal defects in the steel cord material using magnetism, X-rays, ultrasonic waves, and the like. The magnetic flux leakage detection method is a magnetic detection technology with high automation degree, and the principle is as follows: after the ferromagnetic material is magnetized, the surface and near-surface defects of the ferromagnetic material form a leakage magnetic field on the surface of the ferromagnetic material, and the defects are found by detecting the leakage magnetic field.
The invention discloses an invention patent application with the publication number of CN108358012A and the name of a distance-adjustable elevator steel wire rope detection device in 2018, 8.3.8.8.A national intellectual property office comprises two detection units, an insertion tongue and a safety pin assembly; the insertion tongue is arranged between the two detection units and is connected with any one of the detection units; the other detection unit is provided with a sliding groove and a safety pin assembly, an insertion tongue is embedded into the sliding groove to form sliding fit, and the safety pin assembly is used for adjusting and positioning the distance of the insertion tongue extending into the sliding groove. The steel wire rope detection device adjusts the distance between the two detection units by using the insertion tongue, so that the distance between the two detection units is changed, and meanwhile, the safety pin assembly is adopted to realize the positioning and locking of the distance between the inner chambers, so that the steel wire rope detection device is suitable for the online detection of the steel wire ropes of the elevators in different types. Although the application range of the steel wire rope detection device is expanded, the purpose of detecting steel wire ropes with different diameters cannot be achieved. The positioning and distance adjusting of the positioning pin assembly can only achieve that the detection of steel wire ropes with certain diameters is accurate, when the positioning pin is positioned in a through hole, the diameter of the steel wire rope capable of being detected is located in an interval, if the steel wire rope is detected in the interval range of positioning pin positioning of two different diameters of steel wire ropes a and b (Da > Db, and Da and Db), the detection signal of the steel wire rope a is better than that of the steel wire rope b, because the interval between the surface to be detected of the steel wire rope a and a sensor is smaller, the signal strength is higher, the defect signal is not easy to be submerged, and the reliability of the detection result of the steel wire ropes with different diameters can not be guaranteed.
Disclosure of Invention
The invention aims to provide a steel wire rope damage detection system which can ensure that the distance between a detection surface and the outer surface of a steel wire rope is not changed in the process of detecting the steel wire ropes with different diameters.
In order to solve the technical problems, the invention provides the following technical scheme:
a steel wire rope damage detection system comprises a detector body and detection elements, wherein the detector body comprises a first detector body, a second detector body and an elastic device for adjusting the distance between the first detector body and the second detector body, and the detection elements are arranged in the first detector body and the second detector body;
the detection element comprises an armature arranged in the first detector body and/or the second detector body and a bushing fixedly connected with the armature, a first groove and a second groove are formed in the bushing, and a Hall sensor and a permanent magnet are respectively arranged in the first groove and the second groove;
and two ends of the detector body are respectively provided with a pulley device for fixing the steel wire rope.
Furthermore, the elastic device comprises a housing which is in sliding connection with the first detector body, a compression spring is arranged between the housing and the first detector body, and the housing is fixedly connected with the second detector body;
or, the elastic device comprises a housing which is connected with the first detector body and the second detector body in a sliding mode, and compression springs are arranged between the housing and the first detector body and between the housing and the second detector body.
Furthermore, compression spring's inside be provided with the guide post and with guide post axial fit's uide bushing, guide post and housing fixed connection, the uide bushing and first detection machine body fixed connection.
Further, the cover comprises an upper cover half and a lower cover half and a locking device for locking the upper cover half and the lower cover half.
Further, the pulley device comprises pulley supports arranged at two ends of the detector body and pulleys arranged on the pulley supports, wherein at least one pulley is a displacement pulley, and the rest are positioning pulleys.
Further, the surface of the positioning pulley is lower than the end face of the bush.
Further, a displacement sensor is arranged inside the displacement pulley.
Further, the distance between the Hall sensor and the surface of the positioning pulley is 1-3 mm.
Furthermore, the end part of the detector body is provided with an aviation plug interface electrically connected with the Hall sensor.
Furthermore, the material of the lining is copper.
Compared with the prior art, the invention has the following beneficial effects:
the steel wire rope damage detection system controls the distance between the first detector body inner bushing and the second detector body inner bushing (or the second detector body) through the elastic device, and after the steel wire rope is placed between the first detector body inner bushing and the second detector body inner bushing (or the second detector body), the surface of the first detector body inner bushing and the surface of the second detector body inner bushing (or the second detector body) can be ensured to be in close contact with the surface of the steel wire rope. When detecting wire rope, no matter whether wire rope's diameter changes, set up the distance between the inside hall sensor of bush and the wire rope surface and remain unanimous throughout to pulley gear has reduced rocking of wire rope in the testing process to wire rope's fixed action, has improved wire rope's detection precision. Therefore, the steel wire rope detection device can detect the steel wire ropes with different diameters by adjusting the distance between the first detection machine body and the second detection machine body, the detection range is expanded, the operation is simple, and the detection precision of the steel wire ropes can be ensured.
Drawings
Fig. 1 is a schematic structural diagram of a steel wire rope damage detection system according to embodiment 1 of the present invention;
FIG. 2 is a side cross-sectional view of an embodiment 1 of a damage detection system for a steel cord according to the present invention, without a steel cord placed therein;
fig. 3 is a schematic structural diagram of an embodiment 2 of the steel wire rope damage detection system according to the present invention;
fig. 4 is a side cross-sectional view of an embodiment 2 of a damage detection system for a steel cord according to the present invention without a steel cord;
FIG. 5 is a front cross-sectional view of an unplaced wireline in a wireline damage detection system of the present invention;
fig. 6 is a front cross-sectional view of a wire rope placed in the wire rope damage detection system of the present invention.
Detailed Description
To make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a steel wire rope damage detection system which comprises a detector body 1 and detection elements, wherein the detector body 1 comprises a first detector body 1-1, a second detector body 1-2 and an elastic device 2 used for adjusting the distance between the first detector body 1-1 and the second detector body 1-2, and the detection elements 3 are arranged in the first detector body 1-1 and the second detector body 1-2;
the detection element 3 comprises an armature 3-1 arranged in the first detector body 1-1 and/or the second detector body 1-2 and a bushing 3-3 fixedly connected with the armature 3-1, a first groove and a second groove are arranged on the bushing 3-3, and a Hall sensor 3-2 and a permanent magnet 3-4 are respectively arranged in the first groove and the second groove;
two ends of the detector body 1 are respectively provided with a pulley device 4 for fixing a steel wire rope.
The steel wire rope damage detection system has the advantages that when a steel wire rope is not detected, the distance between the end face of the inner bushing 3-3 in the first detector body 1-1 and the end face of the inner bushing 3-3 in the second detector body 1-2 (or the end face of the second detector body 1-2) is very small or the two end faces are in contact with each other under the action of the elastic device 2. When the steel wire rope needs to be detected, the elastic device 2 is opened or detached, the first detector body 1-1 and the second detector body 1-2 are far away after being separated from the elastic device 2, so that the distance between the inner bushing 3-3 of the first detector body 1-1 and the inner bushing 3-3 of the second detector body 1-2 (or the second detector body 1-2) is increased, the steel wire rope is placed between the inner bushing 3-3 of the first detector body 1-1 and the inner bushing 3-3 of the second detector body 1-2 (or the second detector body 1-2), the elastic device 2 is then closed or installed, and the surfaces of the inner bushing 3-3 of the first detector body 1-1 (or the second detector body 1-2) and the surfaces of the inner bushing 3-3 of the second detector body 1-2 (or the second detector body 1-2) are in close contact with the surface of the steel wire rope respectively under the action of the elastic device 2. The steel wire rope arranged in the detector body 1 is magnetized to be saturated along the axial direction of the detected unit, the armature 3-1, the permanent magnet 3-4 and the steel wire rope form a magnetic closed loop, the Hall sensor 3-2 can sense a leakage magnetic field on the surface of the steel wire rope and output an electric signal in direct proportion to the magnitude of the leakage magnetic field, and a detector can judge different defects of the steel wire rope at each position according to recorded data.
The steel wire rope damage detection system controls the distance between the inner bushing 3-3 in the first detector body 1-1 and the inner bushing 3-3 in the second detector body 1-2 (or the second detector body 1-2) through the elastic device 2, and after a steel wire rope is placed between the inner bushing 3-3 in the first detector body 1-1 and the inner bushing 3-3 in the second detector body 1-2 (or the second detector body 1-2), the surface of the inner bushing 3-3 in the first detector body 1-1 and the surface of the inner bushing 3-3 in the second detector body 1-2 (or the second detector body 1-2) can be ensured to be in close contact with the surface of the steel wire rope. When the steel wire rope is detected, no matter whether the diameter of the steel wire rope changes or not, the distance between the Hall sensor 3-2 arranged inside the bushing 3-3 and the surface of the steel wire rope is always kept consistent, and the pulley device 4 has a fixing effect on the steel wire rope, so that the shaking of the steel wire rope in the detection process is reduced, and the detection precision of the steel wire rope is improved. Therefore, the distance between the first detector body 1-1 and the second detector body 1-2 is adjusted, the detection of the steel wire ropes with different diameters can be realized, the detection range is expanded, the operation is simple, and the detection precision of the steel wire ropes can be ensured.
In the present invention, the elastic device 2 preferably adopts the following structure to control the first detecting machine body 1-1 and the second detecting machine body 1-2.
Example 1:
as shown in fig. 1-2 and 5-6, the elastic device 2 includes a housing 2-2 slidably connected to the first detecting machine body 1-1 and the second detecting machine body 1-2, and compression springs 2-1 are disposed between the housing 2-2 and the first detecting machine body 1-1 and between the housing 2-2 and the second detecting machine body 1-2.
In the embodiment, when the steel wire rope is detected, the position of the housing 2-2 is fixed. When no steel wire rope is placed between the two bushes 3-3, the compression spring 2-1 is in an original state or a micro-compression state, and the end faces of the two bushes 3-3 are in contact fit or are in close distance. When the steel wire rope is placed between the two bushings 3-3, the distance between the two bushings 3-3 is increased, so that the first detector body 1-1 and the second detector body 2-2 move towards the compression spring 2-1 relative to the housing 2-2. When the distance of the common movement of the first detector body 1-1 and the second detector body 2-2 reaches the diameter of the steel wire rope, the first detector body 1-1 and the second detector body 1-2 stop moving, and the reaction force of the two compression springs 2-1 causes the surface of the steel wire rope to be tightly attached to the end faces of the two bushings 3-3.
Example 2:
as shown in fig. 3-6, the elastic device 2 includes a housing 2-2 'slidably connected to the first detecting machine body 1-1, a compression spring 2-1' is disposed between the housing 2-2 'and the first detecting machine body 1-1, and the housing 2-2' is fixedly connected to the second detecting machine body 1-2.
Different from the embodiment 1, in the embodiment 2, only the first detector body 2-1 and the casing 2-2' are connected in a sliding way. In embodiment 2, the position of the housing 2-2' and the second detecting machine body 1-2 is fixed when detecting the wire rope. When no steel wire rope is placed between the two bushings 3-3, the compression spring 2-1' is in an original state or a micro-compression state, and the end faces of the two bushings 3-3 are in contact fit or are in close distance. When the steel wire rope is placed between the two bushings 3-3, the distance between the two bushings 3-3 is increased, which causes the first detecting machine body 1-1 to move relative to the housing 2-2 'in the direction of compressing the spring 2-1'. When the moving distance of the first detector body 1-1 reaches the diameter of the steel wire rope, the first detector body 1-1 stops moving, and the reaction force of the compression spring 2-1' causes the surface of the steel wire rope to be tightly attached to the end faces of the two bushings 3-3.
In the two embodiments, in order to prevent the first detecting machine body 1-1 and the second detecting machine body 1-2 from generating a stuck phenomenon in the moving process relative to the housing 2-2/2-2', a sliding groove 5 may be provided in the first detecting machine body 1-1 and the second detecting machine body 1-2, and a rolling bearing 6 slidably engaged with the sliding groove 5 is provided on one side of the housing 2-2/2-2'.
In the two embodiments, when the first detector body 1-1 and the second detector body 1-2 move relative to the housing 2-2, in order to prevent the compression spring 2-1 from inclining, a guide mechanism may be disposed in the inner hole of the compression spring 2-1, specifically, the guide mechanism may include a guide rod 7 and a guide sleeve 8 which axially slide, the guide rod 7 and the guide sleeve 8 are both disposed inside the compression spring 2-1, the guide post is fixedly connected with the housing 2-2, and the guide sleeve 8 is fixedly connected with the first detector body 1-1.
In the two embodiments, in order to facilitate the detection of the steel wire rope damage detection system of the present invention from any position of the steel wire rope, the housing 2-2/2-2' may be detachable from top to bottom or from left to right. For example, when a structure which is detachable from the upper side to the lower side is adopted, the housing 2-2/2-2' may include an upper housing half 2-2-1 and a lower housing half 2-2-2 and a locking device 2-2-3 for locking the upper housing half 2-2-1 and the lower housing half 2-2-2. When the steel wire rope needs to be detected, the locking device 2-2-3 is opened, the upper half housing 2-2 (the first detector body 1-1) and the lower half housing 2-2 (the second detector body 1-2) are separated under the action of the compression spring 2-1, the steel wire rope can be placed between the two bushings 3-3 from the side, then the upper half housing 2-2-1 and the lower half housing 2-2-2 are locked through the locking device 2-2-3, and the steel wire rope can be detected.
The locking device 2-2-3 may adopt a locking structure in the prior art, such as a snap-fit manner, which is not the focus of the present invention and will not be described in detail herein.
In an embodiment of the present invention, the pulley device 4 preferably includes pulley supports 4-1 disposed at two ends of the detecting machine body 1 and pulleys disposed on the pulley supports 4-1, wherein at least one pulley is a displacement pulley 4-3, and the others are positioning pulleys 4-2. 4 pulley supports 4-1 can be arranged at two ends of the first detector body 1-1 and the second detector body 1-2, a displacement pulley 4-3 is arranged on one pulley support 4-1, and positioning pulleys are arranged on the other three pulley supports 4-1, when the steel wire rope enters the system, the positioning pulleys 4-2 are tightly attached to the outer surface of the steel wire rope, so that two ends of a section (the part of the steel wire rope, which is positioned inside the detector body 1) to be detected of the steel wire rope are subjected to the same force in the radial direction, and the steel wire rope of the section to be detected is ensured to be always parallel to the detection surface of the Hall sensor 3-2. And the displacement pulley can rotate around the displacement pulley along with the movement of the steel wire rope, and has a certain guiding effect on the movement of the steel wire rope.
Further, a displacement sensor (not shown) may be provided inside the displacement pulley 4-3. After the damage detection system of the steel wire rope is fixed, the steel wire rope starts to lift to drive the displacement pulley 4-3 tightly attached to the surface of the steel wire rope to rotate, at the moment, the displacement sensor can collect the position information of the steel wire rope and transmit the position information to the PC end, then when the steel wire rope passes through the interior of the detector body 1, the Hall sensor 3-2 converts the collected magnetic signals into electric signals and transmits the electric signals to the PC end, and the PC end identifies and processes the electric signals and combines the position information transmitted by the displacement sensor to obtain the health condition information of the steel wire rope.
In the process of detecting the steel wire rope, in order to reduce or even eliminate friction between the outer surface of the steel wire rope and the first detector body 1-1 and the second detector body 1-2 and simultaneously ensure that the surface quality of the steel wire rope is not influenced in the detection process, the surface of the positioning pulley 4-2 is preferably designed to be lower than the end face of the bushing 3-3, namely the surface of the positioning pulley 4-2 preferably protrudes out of the end face of the bushing 3-3.
Furthermore, the lining 3-3 can be made of copper materials, so that the outer surface of the steel wire rope cannot be abraded even if the steel wire rope and the lining 3-3 rub in the detection process.
In one embodiment of the invention, the distance between the Hall sensor 3-2 and the surface of the positioning pulley 4-2 is preferably 1-3 mm, and further 2mm, so that the intensity of a magnetic signal collected by the Hall sensor 3-2 can be ensured to be maximized, and the detection precision of a steel wire rope is further improved.
In one embodiment of the invention, in order to facilitate the connection of the hall sensor 3-2 and the aviation plug and transmit the detected data to the PC end, an aviation plug interface 1-3 electrically connected with the hall sensor 3-2 may be arranged at the end of the detector body 1.
In addition, in order to reduce the weight of the detector and facilitate the operation of the detector, the detector body 1 and the casing 2-2 are preferably made of carbon fiber materials.
In conclusion, the steel wire rope damage detection system can simultaneously perform online detection on the broken strands and the magnetic leakage of the steel wire ropes, simultaneously realizes the additional detection on the steel wire ropes with different diameters through the self-distance adjusting structure, ensures the detection precision, and has the advantages of simple integral structure, firm operation, reasonable design, low cost, good operability and good popularization value.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A steel wire rope damage detection system comprises a detector body and detection elements, and is characterized in that the detector body comprises a first detector body, a second detector body and an elastic device for adjusting the distance between the first detector body and the second detector body, and the detection elements are arranged in the first detector body and the second detector body;
the detection element comprises an armature arranged in the first detector body and/or the second detector body and a bushing fixedly connected with the armature, a first groove and a second groove are formed in the bushing, and a Hall sensor and a permanent magnet are respectively arranged in the first groove and the second groove;
two ends of the detector body are respectively provided with a pulley device for fixing a steel wire rope;
the elastic device comprises a housing which is in sliding connection with the first detector body, a compression spring is arranged between the housing and the first detector body, and the housing is fixedly connected with the second detector body; or the elastic device comprises a housing which is in sliding connection with the first detector body and the second detector body at the same time, and compression springs are arranged between the housing and the first detector body and between the housing and the second detector body;
the inner part of the compression spring is provided with a guide post and a guide sleeve axially matched with the guide post, the guide post is fixedly connected with the housing, and the guide sleeve is fixedly connected with the first detector body.
2. The steel cord damage detection system of claim 1 wherein said housing comprises upper and lower housing halves and locking means for locking said upper and lower housing halves.
3. A damage detection system for a wire rope according to any one of claims 1 to 2, wherein the pulley means includes pulley brackets provided at both ends of the detector body and pulleys provided on the pulley brackets, at least one of the pulleys being a displacement pulley and the others being positioning pulleys.
4. A wireline damage detection system as claimed in claim 3, characterized in that the surface of the positioning sheave is lower than the end face of the bushing.
5. A wire rope damage detection system as claimed in claim 3 wherein a displacement sensor is provided inside the displacement sheave.
6. A wire rope damage detection system according to claim 3, wherein the distance between the hall sensor and the surface of the positioning sheave is 1-3 mm.
7. The steel wire rope damage detection system according to claim 1, wherein an aviation plug interface electrically connected with the hall sensor is arranged at an end of the detector body.
8. A wireline damage detection system as claimed in claim 1 wherein the liner is formed of copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911174062.3A CN110823993B (en) | 2019-11-26 | 2019-11-26 | Wire rope damage detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911174062.3A CN110823993B (en) | 2019-11-26 | 2019-11-26 | Wire rope damage detection system |
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| CN110823993A CN110823993A (en) | 2020-02-21 |
| CN110823993B true CN110823993B (en) | 2022-11-11 |
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| CN201911174062.3A Active CN110823993B (en) | 2019-11-26 | 2019-11-26 | Wire rope damage detection system |
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| CN112525985B (en) * | 2020-12-17 | 2022-03-29 | 中国矿业大学(北京) | Follow-up wire rope flaw detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08134878A (en) * | 1994-11-10 | 1996-05-28 | Kensetsusho Kanto Chiho Kensetsu Kyokucho | Detecting and adjusting device of wirerope tension, and control method of hoisting device |
| JP2009122074A (en) * | 2007-11-19 | 2009-06-04 | Hitachi Ltd | Flaw detector of wire rope |
| CN206192946U (en) * | 2016-12-02 | 2017-05-24 | 北京邮电大学 | Quantitative on -line monitoring appearance of local damage to built on stilts people's car wire rope in colliery |
| CN208313890U (en) * | 2018-07-03 | 2019-01-01 | 北京巨辰检测服务有限公司 | Steel wire nondestructive detection device |
| CN109212016A (en) * | 2018-10-18 | 2019-01-15 | 青岛理工大学 | A kind of detachable wire-rope flaw detector and method based on poly- magnetic effect |
| CN208547631U (en) * | 2018-08-08 | 2019-02-26 | 西屋电梯有限公司 | A kind of overhauling elevator rope fault finder |
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2019
- 2019-11-26 CN CN201911174062.3A patent/CN110823993B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08134878A (en) * | 1994-11-10 | 1996-05-28 | Kensetsusho Kanto Chiho Kensetsu Kyokucho | Detecting and adjusting device of wirerope tension, and control method of hoisting device |
| JP2009122074A (en) * | 2007-11-19 | 2009-06-04 | Hitachi Ltd | Flaw detector of wire rope |
| CN206192946U (en) * | 2016-12-02 | 2017-05-24 | 北京邮电大学 | Quantitative on -line monitoring appearance of local damage to built on stilts people's car wire rope in colliery |
| CN208313890U (en) * | 2018-07-03 | 2019-01-01 | 北京巨辰检测服务有限公司 | Steel wire nondestructive detection device |
| CN208547631U (en) * | 2018-08-08 | 2019-02-26 | 西屋电梯有限公司 | A kind of overhauling elevator rope fault finder |
| CN109212016A (en) * | 2018-10-18 | 2019-01-15 | 青岛理工大学 | A kind of detachable wire-rope flaw detector and method based on poly- magnetic effect |
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