CN116124369A - Rapid nondestructive testing method and system for air holes and cracks of cable protection pipe - Google Patents
Rapid nondestructive testing method and system for air holes and cracks of cable protection pipe Download PDFInfo
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- CN116124369A CN116124369A CN202211515486.3A CN202211515486A CN116124369A CN 116124369 A CN116124369 A CN 116124369A CN 202211515486 A CN202211515486 A CN 202211515486A CN 116124369 A CN116124369 A CN 116124369A
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- cable protection
- cover plate
- protection tube
- sealing ring
- communicating vessel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/91—Investigating the presence of flaws or contamination using penetration of dyes, e.g. fluorescent ink
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to the technical field of on-site nondestructive testing of cable protection pipes, and discloses a rapid nondestructive testing method and a rapid nondestructive testing system for air holes and cracks of a cable protection pipe. The comprehensive detection method comprises the steps of detecting air tightness and detecting cracks, wherein the air tightness detection device comprises an upper cover plate, a lower cover plate, a sealing strip, a first sealing ring, a second sealing ring, a cable protection pipe, screws, nuts, a vent pipe, a rubber hose and a U-shaped communicating vessel, and the hand-operated screw propeller judges the tightness of the cable protection pipe by observing the ascending and descending of scales of liquid in the U-shaped communicating vessel. In the state of no air hole, the crack detection adopts a dye penetration flaw detection method to detect the crack of the cable protection tube, and the crack in the cable protection tube is developed by adopting a penetrating agent, a developer and a cleaning agent, so that whether the quality of the crack is qualified is judged. The device has the advantages of simple structure, convenient operation, no need of a power system and time, energy and cost saving.
Description
Technical Field
The invention belongs to the technical field of quick nondestructive testing of medium-low voltage cable protection pipes, and particularly relates to a quick nondestructive testing method and a quick nondestructive testing system for air holes and cracks of a cable protection pipe.
Background
The development of the power grid and the increase of the laying amount of the power cable are vigorous in the market demand of the power grid of the medium-low voltage cable protection tube, the quality requirement on the cable protection tube is also increasingly improved, if the cable protection tube has quality problems, the cable protection tube can deform or break when being extruded and impacted by external force, the protection effect on the cable is greatly weakened, the cable outer sheath and insulation can be damaged when serious, the line fault is induced, and the safe operation of the cable line is influenced. At present, the quality of the cable protection tube product is uneven, the problem of the supervision end is strong in reverberations, aiming at the defects of severe form of the sampling inspection result of the cable protection tube, general low product qualification rate and related industry standards, the production process is not strictly controlled, and the high-efficiency quality inspection technology and supervision system are lacking, so that potential safety hazards are buried for the quality of the power engineering.
The conventional detection mode of the medium-low voltage cable protection tube is to select a sample to be sent to a laboratory for destructive detection, and the detection process is complex, has destructive property on the sample, long detection time and high economic cost. At present, the nondestructive testing technology for the medium-low voltage cable protection tube is still immature, the testing mode is complex, the equipment is heavy, the requirement on the level of testing personnel is very high, and a set of effective testing mode suitable for engineering sites is lacked. Meanwhile, the situation that a power system is inconvenient often exists on site, so that the nondestructive testing method without the power system is urgently needed.
Aiming at the technical defects, the quick nondestructive testing technology of the middle-low voltage cable protection tube, which is more suitable for field detection, high in detection precision and simple in detection method, is necessary to be researched, the portable and easy-to-operate detection device is developed, the full-scale pre-screening of the cable protection tube is realized, the quality control level of the middle-low voltage cable protection tube is improved, and the long-term safe operation of a cable line is ensured.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a rapid nondestructive testing method and a rapid nondestructive testing system for air holes and cracks of a cable protection tube, wherein the cable protection tube is sealed by designing a sealing device of the cable protection tube, the sealing device and external atmospheric pressure form pressure difference by a communicating vessel principle, and the air tightness detection is realized by observing the change of liquid graduation marks. Under the condition of ensuring that the air tightness of the cable protection tube is good, the surface crack of the cable protection tube is detected by adopting the dye penetrant. The rapid nondestructive detection of the cable protection tube on the engineering site is realized, the structure is simple, the use is convenient, a power system is not needed, and the time, the materials and the energy can be saved.
The first aspect of the invention provides a cable protection tube air hole rapid nondestructive testing system, comprising:
the sleeve is formed by splicing an upper cover plate and a lower cover plate, and the section of the upper cover plate is semicircular; the section of the lower cover plate is semicircular, the lower cover plate and the upper cover plate can completely cover a section of outer wall of the cable protection tube after being spliced, the diameter of the sleeve is larger than that of the cable protection tube, and an interlayer is formed between the inner wall of the sleeve and the outer wall of the cable protection tube;
the sealing strips are arranged on the butt joint edges of the upper cover plate and the lower cover plate;
the first sealing ring is sleeved on the cable protection pipe and used for sealing off the first end of the interlayer;
the second sealing ring is sleeved on the cable protection pipe and used for sealing off the second end of the interlayer;
the vent pipe is provided with an air inlet end and an air outlet end, and the air outlet end is inserted into the first sealing ring or the second sealing ring and is communicated with the interlayer;
the first end of the rubber hose is communicated and connected with the air inlet end of the vent pipe;
the first end of the U-shaped communicating vessel is communicated and connected with the second end of the rubber hose;
the hand-operated spiral propeller is connected with the second end of the U-shaped communicating vessel.
Further, the first sealing ring and the second sealing ring adopt rubber sealing rings.
Further, the first sealing ring or the second sealing ring is provided with a vent hole.
The second aspect of the invention provides an air tightness detection method of the cable protection tube air hole rapid nondestructive detection system,
selecting a first sealing ring and a second sealing ring with proper sizes according to different cable protection pipes, coating an upper cover plate and a lower cover plate on the cable protection pipes, and fastening sealing strips through screws and nuts;
the device is connected with the vent pipe, the rubber hose and the U-shaped communicating vessel, 1/3 liquid is filled in the U-shaped communicating vessel, pressure is applied to the U-shaped communicating vessel through the hand-operated spiral propeller, scale mark displacement conditions of the U-shaped communicating vessel are observed, and whether the cable protection tube has air holes or not is judged.
Further, after the air tightness of the cable protection tube is detected to be qualified, the air tightness detection device is disassembled, the cable protection tube to be detected is subjected to dye check by using the dye check agent, a matching relationship is established by calculating dye check size and crack depth in a laboratory in the earlier stage, the crack size is accurately judged, and whether the service requirement is met or not is detected by using the imaging size.
Further, the liquid used in the U-shaped communicating vessel is absolute ethyl alcohol.
Advantages and beneficial effects of the invention
The device and the system can realize the rapid nondestructive detection of the engineering field cable protection tube, provide a new detection means for the detection means of air holes and cracks, and solve the technical problems of inconvenient carrying of engineering field equipment, inconvenient electric power system and complex detection mode. The invention has the advantages of convenient carrying, simple operation, simple and quick detection mode, high detection accuracy and suitability for field detection.
Drawings
FIG. 1 is an exploded view of a structure of an air tightness detecting device in an example of the present invention;
FIG. 2 is a front view showing the structure of an air tightness detecting device in the example of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a top view showing the structure of an air tightness detecting device in the example of the invention;
fig. 5 is a cross-sectional view taken along line B-B of fig. 4.
Wherein like reference numerals refer to like structures or elements throughout, and wherein:
1 is an upper cover plate; 2 is a lower cover plate; 3 is a sealing strip; 4 is a first sealing ring; 5 is a second sealing ring; 6 is a cable protection tube; 7 is a screw; 8 is a nut; 9 is a vent pipe; 10 is a rubber hose; 11 is a U-shaped communicating vessel; 12 is a hand-operated screw propeller, 13 is an interlayer.
The specific embodiment is as follows:
the present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific examples described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, terms such as "fixedly attached," "connected," "coupled," and the like are to be construed broadly and refer to either a fixed connection or an integral or removable connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present invention can be determined according to circumstances by a person skilled in the relevant art or the art, and is not to be construed as limiting the present invention.
The quick nondestructive testing system for the air holes of the cable protection pipe comprises a sleeve, two sealing strips 3, a first sealing ring 4, a second sealing ring 5, a vent pipe 9, a rubber hose 10, a U-shaped communicating vessel 11 and a hand-operated screw propeller 12. The sleeve is formed by splicing an upper cover plate 1 and a lower cover plate 2, and the section of the upper cover plate 1 is semicircular; the section of the lower cover plate 2 is semicircular, the lower cover plate 2 and the upper cover plate 1 can completely cover one section of outer wall of the cable protection tube 6 after being spliced, the diameter of the sleeve is larger than that of the cable protection tube 6, and an interlayer 13 is formed between the inner wall of the sleeve and the outer wall of the cable protection tube 6, as shown in fig. 4.
The sealing strip 3 is used for sealing the upper cover plate 1 and the lower cover plate 2. The sealing strip 3 is arranged on the butt joint edge of the upper cover plate 1 and the lower cover plate 2. And the tightness between the cable protection tube and the cable protection tube is ensured.
As shown in fig. 4, the first sealing ring 4 is sleeved on the cable protection tube 6 to seal the first end of the interlayer 13; the second sealing ring 5 is sleeved on the cable protection pipe 6 and seals the second end of the interlayer 13. The first sealing ring 4 and the second sealing ring 5 are used for sealing the interlayer 13. The first sealing ring 4 and the second sealing ring 5 adopt rubber sealing rings, the sizes of which can be selected according to the pipe diameters of different cable protection pipes 6, so that the cable protection pipes 6 are ensured to have enough tightness on the outer surfaces. The first seal ring 4 or the second seal ring 5 has a through hole in which a vent pipe 9 is installed in the ring for conducting gas between the seal chamber and the U-shaped communicating vessel 11.
The vent pipe 9 is provided with an air inlet end and an air outlet end, and the air outlet end is inserted into the first sealing ring 4 or the second sealing ring 5 and is communicated with the interlayer 13; the first end of the rubber hose 10 is communicated and connected with the air inlet end of the vent pipe 9; the first end of the U-shaped communicating vessel 11 is communicated and connected with the second end of the rubber hose 10; the hand-operated screw propeller 12 is connected with the second end of the U-shaped communicating vessel 11. The hand screw 12 is used to apply air pressure to the communicating vessel.
The air tightness detection device is used for forming a sealing state of a section of cable protection tube 6, connecting the cable protection tube 6 with a U-shaped communicating vessel 11 through a vent pipe 9 and a rubber hose 10, applying pressure to the U-shaped communicating vessel 11 by a hand-operated spiral propeller 12, detecting whether the cable protection tube 6 has air holes or not by observing the movement condition of scale marks of liquid in the U-shaped communicating vessel 11, dismantling the air tightness detection device after the air tightness requirement is met, carrying out dye check on the surface of the cable protection tube 6 by using a DPT-5 dye check agent, detecting the crack condition of the cable protection tube, and rapidly judging the performance of the cable protection tube 6.
The breather pipe 9 and the U-shaped communicating vessel 11 are connected by adopting the rubber hose 10, so that the position of the breather pipe can be adjusted according to the position direction of the actual cable protection pipe 6, and the U-shaped communicating vessel 11 is provided with specific scale marks on the pipe wall, thereby being convenient for observing the position condition of liquid.
After the air tightness detection device detects the air tightness of the cable protection tube 6 to be qualified, the DPT-5 dye penetrant is used for dye penetrant inspection of the cable protection tube 6, and the size of cracks is observed according to the display size, so that whether the cable protection tube 6 is qualified or not is judged.
The U-shaped communicating vessel 11 needs to add 1/3 liquid before installation, then installs to gas tightness detection device, and finally adds proper amount of liquid in the one end of U-shaped communicating vessel 11 for U-shaped communicating vessel 11 both sides form the difference in height, and the leakproofness that detects the cable protection tube is qualified to the observation liquid scale change condition.
The specific detection method comprises the following steps:
firstly, selecting a first sealing ring 4 and a second sealing ring 5 with proper sizes according to different cable protection pipes, installing an upper cover plate 1 and a lower cover plate 2 on a cable protection pipe 6, and fastening a sealing strip 3 through a screw 7 and a nut 8.
Next, the U-shaped communication vessel 11 filled with 1/3 of the liquid, the ventilation pipe 9 and the rubber hose 10 were mounted to the air tightness detecting device. And adding a proper amount of liquid into the U-shaped communicating vessel 11, so that the height difference exists between the liquid in the two side pipes of the U-shaped communicating vessel 11, applying a certain pressure to the U-shaped communicating vessel 11 by using the hand-operated spiral propeller 12, and observing the change of the scale marks of the liquid after the air pressure at the two sides is stable, thereby detecting whether the air tightness of the cable protection pipe is qualified.
Then, after the air tightness of the cable protection tube 6 is detected to be qualified, the air tightness detection device is disassembled, the DPT-5 dye check agent is used for dye check on the cable protection tube 6 to be detected, and whether the cable protection tube 6 meets the use requirement is detected through the display size. The principle is to check the opening defect of the surface of the material and the product by utilizing the penetration phenomenon, capillary action and adsorption principle of the liquid. When flaw detection is carried out, red penetrating agent is applied to the surface to be detected, if the surface to be detected has a flaw, the penetrating agent penetrates into the flaw, when the surface is removed and excessive penetrating agent is applied, white imaging agent is applied, and the penetrating agent in the flaw is sucked out, so that red flaw trace appears on a white background.
DPT-5 dye check agents used in the crack detection method include penetrants, developers and cleaners.
The specific operation steps are as follows:
1. pre-cleaning: completely cleaning dirt (oxide skin, rust, grease and the like) on the surface of the cable protection tube to be detected by using a cleaning agent;
2. penetration: placing for 5-10 min, applying penetrant after the surfaces of the workpiece and the test block are dried, wherein the nozzle is 20-30mm away from the surfaces of the workpiece and the test block, and the penetration time is generally 5-15 min according to the use instruction, and the flaw detection surface is kept to be sufficiently wetted by the penetrant during the penetration time;
3. cleaning: scrubbing the penetrating agent on the surface of the workpiece by using a cleaning agent;
4. developing: after the imaging agent is fully and evenly shaken, the detected workpiece is evenly sprayed at a distance of 300mm, and defects can be observed after the imaging agent is sprayed for a while.
5. After the inspection is finished, scrubbing and removing the developer by using a cleaning agent;
6. and processing and storing the workpiece according to the process requirements.
Further, a complete experimental database needs to be established between the air tightness index of the cable protection tube and the change of the scale marks of the U-shaped connector, so that the detection result can be rapidly judged in the detection process. Meanwhile, a corresponding matching relation of the qualification rate is established for the relation between the flaw detection agent and the flaw size, and a matching relation is established in advance for the flaw size and the qualification rate judgment standard of the cable protection tube, so that the detection result can be rapidly judged in the detection process.
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (6)
1. A cable protection tube vent quick nondestructive testing system, comprising:
the sleeve is formed by splicing an upper cover plate (1) and a lower cover plate (2), and the section of the upper cover plate (1) is semicircular; the section of the lower cover plate (2) is semicircular, the lower cover plate (2) and the upper cover plate (1) can be completely wrapped on one section of outer wall of the cable protection tube (6) after being spliced, the diameter of the sleeve is larger than that of the cable protection tube (6), and an interlayer (13) is formed between the inner wall of the sleeve and the outer wall of the cable protection tube (6);
the two sealing strips (3), the sealing strips (3) are arranged on the butt joint edges of the upper cover plate (1) and the lower cover plate (2);
the first sealing ring (4) is sleeved on the cable protection pipe (6) and seals the first end of the interlayer (13);
the second sealing ring (5) is sleeved on the cable protection pipe (6) and seals the second end of the interlayer (13);
the vent pipe (9) is provided with an air inlet end and an air outlet end, and the air outlet end is inserted into the first sealing ring (4) or the second sealing ring (5) and is communicated with the interlayer (13);
the first end of the rubber hose (10) is communicated and connected with the air inlet end of the vent pipe (9);
the first end of the U-shaped communicating vessel (11) is communicated and connected with the second end of the rubber hose (10);
and the hand-operated spiral propeller (12), and the hand-operated spiral propeller (12) is connected with the second end of the U-shaped communicating vessel (11).
2. The rapid nondestructive testing system for air holes of cable protection pipes according to claim 1, wherein the first sealing ring (4) and the second sealing ring (5) are rubber sealing rings.
3. The cable protection tube air hole rapid nondestructive testing system according to claim 2, wherein the first sealing ring (4) or the second sealing ring (5) is provided with an air hole.
4. The method for detecting the air tightness of the cable protection tube air hole rapid nondestructive detection system according to claim 3,
selecting a first sealing ring (4) and a second sealing ring (5) with proper sizes according to different cable protection pipes, coating an upper cover plate (1) and a lower cover plate (2) on a cable protection pipe (6), and fastening a sealing strip (3) through a screw (7) and a nut (8);
the device is characterized by comprising a connecting breather pipe (9), a rubber hose (10) and a U-shaped communicating vessel (11), wherein 1/3 liquid is filled in the U-shaped communicating vessel (11), pressure is applied to the U-shaped communicating vessel (11) through a hand-operated spiral propeller (12), scale mark displacement conditions of the U-shaped communicating vessel (11) are observed, and whether an air hole exists in the cable protection tube (6) is judged.
5. The method according to claim 4, wherein the tightness detecting device is disassembled after the tightness of the cable protection tube (6) is detected, the cable protection tube (6) to be detected is subjected to dye check by using dye check agents, a matching relationship is established by calculating dye check sizes and crack depths in a laboratory in advance, the crack sizes are accurately judged, and whether the use requirements are met or not is detected by developing the sizes.
6. The method according to claim 5, characterized in that the liquid used in the U-shaped communication vessel (11) is absolute ethanol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211515486.3A CN116124369A (en) | 2022-11-30 | 2022-11-30 | Rapid nondestructive testing method and system for air holes and cracks of cable protection pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211515486.3A CN116124369A (en) | 2022-11-30 | 2022-11-30 | Rapid nondestructive testing method and system for air holes and cracks of cable protection pipe |
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| Publication Number | Publication Date |
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| CN116124369A true CN116124369A (en) | 2023-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211515486.3A Pending CN116124369A (en) | 2022-11-30 | 2022-11-30 | Rapid nondestructive testing method and system for air holes and cracks of cable protection pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117630007A (en) * | 2023-11-07 | 2024-03-01 | 浙江康思特动力机械有限公司 | Air tightness detection device of outdoor emergency generator set cylinder cover |
-
2022
- 2022-11-30 CN CN202211515486.3A patent/CN116124369A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117630007A (en) * | 2023-11-07 | 2024-03-01 | 浙江康思特动力机械有限公司 | Air tightness detection device of outdoor emergency generator set cylinder cover |
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