A method and system for rapid non-destructive detection of pores and cracks in a cable protection tube

Abstract

The present application relates to the technical field of cable protection pipe on-site nondestructive testing, and discloses a kind of cable protection pipe air hole and crack fast nondestructive testing method and system.It includes the comprehensive detection method of air tightness detection and crack detection, and the air tightness detection device includes upper cover plate, lower cover plate, sealing strip, first sealing ring, second sealing ring, cable protection pipe, screw, nut, air pipe, rubber hose, U-shaped communicating vessel, hand-operated screw propeller, and the sealing property of cable protection pipe is determined by observing the scale rise and fall of liquid in U-shaped communicating vessel.Under the condition of detecting no air hole, the crack detection adopts coloring penetration flaw detection method to detect the crack of cable protection pipe, and the crack in cable protection pipe is developed by using penetrant, developer and cleaning agent, and the quality is determined whether it is qualified or not.The device structure is simple, convenient to operate, does not need power system, can save time, energy and cost.

Description

Technical Field

[0001] This invention belongs to the field of rapid non-destructive testing technology for medium and low voltage cable protection pipes, specifically relating to a rapid non-destructive testing method and system for air holes and cracks in cable protection pipes. Background Technology

[0002] With the development of power grids and the increase in the laying of power cables, the market demand for medium and low voltage cable protection pipes is booming, and the quality requirements for cable protection pipes are also increasing. If cable protection pipes have quality problems, they will deform or break under external pressure or impact, significantly weakening their protective function for the cable. In severe cases, they may even damage the cable's outer sheath and insulation, inducing line faults and power outages, affecting the safe operation of cable lines. Currently, the quality of cable protection pipe products is uneven, and regulatory feedback is strong. The results of spot checks on cable protection pipes are severe, with generally low product qualification rates. The lack of relevant industry standards, lax production process control, and the lack of efficient quality inspection technology and regulatory systems pose hidden safety hazards to the quality of power engineering.

[0003] The conventional testing method for medium and low voltage cable protection pipes involves sending samples to a laboratory for destructive testing. This process is complex, destructive to the samples, time-consuming, and costly. Currently, non-destructive testing (NDT) technology for medium and low voltage cable protection pipes is immature. Testing methods are complex, equipment is bulky, and require highly skilled personnel. There is a lack of effective testing methods suitable for engineering sites. Furthermore, power system limitations are often present on-site. Therefore, there is an urgent need to develop a NDT method that does not require a power system.

[0004] To address the aforementioned technical deficiencies, it is necessary to research rapid non-destructive testing technology for medium and low voltage cable protection pipes that is more adaptable to on-site testing, has higher testing accuracy, and is simpler to implement. This includes developing portable and easy-to-operate testing devices to achieve full "pre-screening" of cable protection pipes, thereby improving the quality control level of medium and low voltage cable protection pipes and ensuring the long-term safe operation of cable lines. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a rapid non-destructive testing method and system for air holes and cracks in cable protection pipes. This method involves designing a sealing device to seal the cable protection pipe, and using the principle of communicating vessels to create a pressure difference between the sealing device and the external atmospheric pressure. Air tightness is detected by observing changes in the liquid scale lines. While ensuring good air tightness of the cable protection pipe, a dye penetrant is used to detect surface cracks. This method enables rapid non-destructive testing of cable protection pipes on-site. It features a simple structure, ease of use, requires no power system, and saves time, materials, and energy.

[0006] The first aspect of the present invention is to provide a rapid non-destructive testing system for air holes in cable protection pipes, comprising:

[0007] A sleeve, which is composed of an upper cover plate and a lower cover plate joined together. The upper cover plate has a semi-circular cross-section. The lower cover plate has a semi-circular cross-section. When the lower cover plate and the upper cover plate are joined together, they can completely cover a section of the outer wall of the cable protection pipe. The diameter of the sleeve is larger than the diameter of the cable protection pipe. An interlayer is formed between the inner wall of the sleeve and the outer wall of the cable protection pipe.

[0008] Two sealing strips are installed on the mating edge of the upper cover plate and the lower cover plate;

[0009] The first sealing ring is fitted onto the cable protection pipe to seal the first end of the interlayer;

[0010] The second sealing ring is fitted onto the cable protection pipe to seal the second end of the interlayer.

[0011] A vent pipe having an inlet end and an outlet end, wherein the outlet end is inserted into the first sealing ring or the second sealing ring and communicates with the interlayer.

[0012] A rubber hose, the first end of which is connected to the air inlet end of the vent pipe;

[0013] A U-shaped connector, wherein the first end of the U-shaped connector is connected to the second end of the rubber hose;

[0014] A hand-cranked screw propeller, which is connected to the second end of the U-shaped connector.

[0015] Furthermore, both the first and second sealing rings are made of rubber.

[0016] Furthermore, the first or second sealing ring has a vent hole.

[0017] A second aspect of the present invention is to provide a method for airtightness testing of the above-mentioned rapid non-destructive testing system for vent holes in cable protection pipes.

[0018] Select appropriate sizes of first and second sealing rings according to different cable protection pipes, cover the cable protection pipe with the upper and lower cover plates, and tighten the sealing strips with screws and nuts;

[0019] Connect the vent pipe, rubber hose, and U-shaped connector. The U-shaped connector is filled with 1 / 3 liquid. Apply pressure to the U-shaped connector by hand-cranking the screw propeller, and observe the displacement of the scale line of the U-shaped connector to determine whether there are air holes in the cable protection pipe.

[0020] Furthermore, after the airtightness of the cable protection pipe is tested and found to be qualified, the airtightness testing device is disassembled, and dye penetrant is used to perform dye penetrant testing on the cable protection pipe to be tested. A matching relationship is established based on the dye penetrant testing size and crack depth calculated in the laboratory in the early stage, the crack size is accurately determined, and whether it meets the usage requirements is detected by imaging size.

[0021] Furthermore, the liquid used in the U-shaped communicating vessel is anhydrous ethanol.

[0022] Advantages and benefits of the present invention

[0023] This device and system enable rapid, non-destructive testing of cable protection pipes on-site. It proposes new detection methods for porosity and cracks, solving the technical challenges of inconvenient equipment portability, power system limitations, and complex testing methods on-site. This invention is portable, easy to operate, offers a simple and rapid testing method, and boasts high accuracy, making it suitable for on-site testing. Attached Figure Description

[0024] Figure 1 This is an exploded view of the airtightness detection device in an example of the present invention;

[0025] Figure 2 This is a front view of the airtightness testing device in an example of the present invention;

[0026] Figure 3 for Figure 2 Sectional view along the AA direction;

[0027] Figure 4 This is a top view of the airtightness testing device in an example of the present invention;

[0028] Figure 5 for Figure 4 BB-direction sectional view.

[0029] In this context, the same reference numerals denote the same structures or elements throughout the drawings, specifically:

[0030] 1 is the upper cover plate; 2 is the lower cover plate; 3 is the sealing strip; 4 is the first sealing ring; 5 is the second sealing ring; 6 is the cable protection tube; 7 is the screw; 8 is the nut; 9 is the vent pipe; 10 is the rubber hose; 11 is the U-shaped connector; 12 is the hand-cranked screw propeller; 13 is the interlayer. Detailed implementation method:

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific examples described herein are merely illustrative and not intended to limit the scope of the invention.

[0032] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, 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 pertains.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] In this invention, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0035] like Figures 1-3 The system shown is a rapid non-destructive testing system for vent holes in cable protection pipes, comprising 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 connector 11, and a hand-cranked screw propeller 12. The sleeve is constructed by assembling an upper cover plate 1 and a lower cover plate 2. The upper cover plate 1 has a semi-circular cross-section; the lower cover plate 2 also has a semi-circular cross-section. When assembled with the upper cover plate 1, the lower cover plate 2 completely covers a section of the outer wall of the cable protection pipe 6. The diameter of the sleeve is larger than the diameter of the cable protection pipe 6. A sandwich 13 is formed between the inner wall of the sleeve and the outer wall of the cable protection pipe 6. Figure 4 As shown.

[0036] The sealing strip 3 is used to seal the upper cover plate 1 and the lower cover plate 2. The sealing strip 3 is installed on the mating edge of the upper cover plate 1 and the lower cover plate 2 to ensure a tight seal with the cable protection pipe.

[0037] like Figure 4As shown, the first sealing ring 4 is fitted onto the cable protection pipe 6, sealing the first end of the interlayer 13; the second sealing ring 5 is fitted onto the cable protection pipe 6, sealing the second end of the interlayer 13. The first sealing ring 4 and the second sealing ring 5 are used to seal the interlayer 13. The first sealing ring 4 and the second sealing ring 5 are rubber sealing rings, and their size can be selected according to the pipe diameter of different cable protection pipes 6 to ensure sufficient sealing to the outer surface of the cable protection pipe 6. The first sealing ring 4 or the second sealing ring 5 has a through hole in its ring for installing a vent pipe 9, which is used to conduct gas between the sealing chamber and the U-shaped communicating vessel 11.

[0038] The vent pipe 9 has an inlet end and an outlet end. The outlet end is inserted into the first sealing ring 4 or the second sealing ring 5 and communicates with the interlayer 13. The first end of the rubber hose 10 is connected to the inlet end of the vent pipe 9. The first end of the U-shaped connector 11 is connected to the second end of the rubber hose 10. The hand-cranked screw propeller 12 is connected to the second end of the U-shaped connector 11. The hand-cranked screw propeller 12 is used to apply air pressure to the connector.

[0039] The airtightness testing device seals a section of cable protection pipe 6 and connects it to a U-shaped connector 11 via a vent pipe 9 and a rubber hose 10. A hand-cranked screw propeller 12 applies pressure to the U-shaped connector 11. The device detects whether there are air holes in the cable protection pipe 6 by observing the movement of the liquid scale line in the U-shaped connector 11. Once the airtightness requirement is met, the airtightness testing device is removed, and DPT-5 dye penetrant is used to perform dye penetrant testing on the surface of the cable protection pipe 6 to detect cracks and quickly determine the performance of the cable protection pipe 6.

[0040] The vent pipe 9 and the U-shaped connector 11 are connected by a rubber hose 10, which can be adjusted according to the actual position and direction of the cable protection pipe 6. The U-shaped connector 11 has specific scale lines on its pipe wall to facilitate observation of the liquid position.

[0041] After the air tightness of the cable protection pipe 6 is qualified by the air tightness testing device, DPT-5 dye penetrant is used to perform dye penetrant testing on the cable protection pipe 6. The size of the crack is observed according to the imaging size to determine whether it is qualified.

[0042] Before installation, the U-shaped connector 11 needs to be filled with 1 / 3 liquid. Then, it is installed into the airtightness testing device. Finally, an appropriate amount of liquid is added to one end of the U-shaped connector 11 to create a height difference between the two sides of the U-shaped connector 11. The change in the liquid level is observed to test whether the sealing performance of the cable protection pipe is up to standard.

[0043] The specific testing method is as follows:

[0044] First, select the appropriate size of the first sealing ring 4 and the second sealing ring 5 according to different cable protection pipes, install the upper cover plate 1 and the lower cover plate 2 on the cable protection pipe 6, and tighten the sealing strip 3 with screws 7 and nuts 8.

[0045] Next, the U-shaped connector 11 filled with 1 / 3 liquid, the vent pipe 9, and the rubber hose 10 are installed onto the airtightness testing device. An appropriate amount of liquid is added to the U-shaped connector 11 to create a height difference between the liquids on both sides. A hand-cranked screw propeller 12 is used to apply a certain pressure to the U-shaped connector 11. After the air pressure on both sides stabilizes, the change in the liquid level is observed to determine whether the cable protection pipe's airtightness is up to standard.

[0046] After the airtightness of cable protection pipe 6 is verified to be qualified, the airtightness testing device is disassembled. DPT-5 dye penetrant is then used to perform dye penetrant testing on the cable protection pipe 6 to be tested. The image size is then used to check whether it meets the usage requirements. The principle is to utilize the penetrant's penetration, capillary action, and adsorption to inspect for opening defects on the surface of materials and products. During testing, a red penetrant is applied to the surface being inspected. If a defect exists on the surface, the penetrant penetrates into the defect. After removing excess penetrant from the surface, a white developer is applied, and the penetrant inside the defect is absorbed, thus revealing a red defect mark on a white background.

[0047] The DPT-5 dye penetrant used in crack detection methods includes a penetrant, a developer, and a cleaning agent.

[0048] The specific operating steps are as follows:

[0049] 1. Pre-cleaning: Use a cleaning agent to completely clean the dirt (scale, rust, grease, etc.) from the surface of the cable protection pipe to be inspected;

[0050] 2. Penetration: After the workpiece and test block surfaces have dried for 5-10 minutes, apply the penetrant. The nozzle should be 20-30 mm away from the workpiece and test block surfaces. The penetration time should be in accordance with the instructions, generally 5-15 minutes. During this period, the surface to be tested should be kept fully moistened with the penetrant.

[0051] 3. Cleaning: Wipe the penetrant off the surface of the workpiece with a cleaning agent;

[0052] 4. Development: After thoroughly shaking the developer, spray it evenly onto the workpiece at a distance of 300mm. Defects can be observed shortly after spraying the developer.

[0053] 5. After inspection, wipe away the developer with a cleaning agent;

[0054] 6. Process and store the workpieces according to the process requirements.

[0055] Furthermore, a complete experimental database needs to be established to correlate the airtightness index of the cable protection pipe with the scale changes of the U-shaped communicating vessel, so that the test results can be quickly judged during the testing process. Simultaneously, a corresponding matching relationship between the flaw detection agent and crack size should be established for the pass rate, and a matching relationship should be established in advance between the crack size and the pass rate judgment criteria for the cable protection pipe, so that the test results can be quickly judged during the testing process.

[0056] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A system for rapid non-destructive testing of voids in cable protection pipes, characterized in that, The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control.

2. The cable protection tube air hole rapid non-destructive detection system of claim 1, wherein, The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control.

3. The cable protection tube air hole rapid non-destructive detection system of claim 2, wherein, The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control.

5. The method of claim 4, wherein, The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control.

6. The method of claim 5, wherein, The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. The utility model relates to a cable protection pipe air hole quick nondestructive testing system and air tightness detection method thereof, and belongs to the technical field of cable protection pipe quality control. 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