In-pipeline detector probe capable of improving axial sampling density

Abstract

The utility model relates to the technical field of pipeline internal detection, in particular to a pipeline internal detector probe capable of improving axial sampling density, which comprises a probe shell, a probe circuit board and a plurality of rows of detection sensors, the probe shell is provided with the probe circuit board, and the probe shell is uniformly provided with the plurality of rows of detection sensors from front to back. The distance between the front and back adjacent rows of detection sensors is calculated according to the technical index of the axial sampling distance of the detector in the pipeline, and each row of detection sensors can pick up detection signals at different positions, so that the axial sampling density can be obviously improved under the condition that the technical index of the axial sampling distance of the detector in the pipeline is not improved; more comprehensive detection data can be obtained, and the detection capability of the detector in the pipeline on defects with small axial sizes, such as circumferential crack defects, can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of in-pipe detection, in particular to an in-pipe detector probe for improving the axial sampling density. Background Art

[0002] During the operation of pipelines, various defects will occur due to corrosion, geological movement, mechanical damage, self-defects, etc. These defects will have an adverse impact on the safe operation of pipelines. It is of great significance to detect and track pipeline defects. Usually, in-pipe detectors are used to detect pipeline defects. The axial sampling interval is one of the key technical indicators of in-pipe detectors. The in-pipe detector moves forward under the push of the medium in the pipeline and records the running distance at the same time. Every time it moves forward a certain distance, the detector sends a data acquisition trigger signal once and conducts a detection data acquisition on the pipeline. This forward movement distance is the axial sampling interval of the detector, which is usually a fixed value. Currently, commonly used in-pipe detectors are mainly divided into standard definition, high definition and ultra-high definition detectors according to their detection performance. The corresponding axial sampling intervals are usually 3.3 mm, 2 mm and 1 mm. For example, for an ultra-high definition detector, every time it moves forward 1 mm, the detector conducts a detection data acquisition on the pipeline, as Figures 1-3 shown.

[0003] Crack-like defects are a common type of pipeline defect, usually appearing near the heat affected zone of pipeline welding. Since the pipeline failure caused by it usually shows pipeline rupture rather than leakage, the failure consequence is more serious and the potential safety hazard is great. Therefore, it is an important factor leading to pipeline failure; the crack-like defects in the heat affected zone of pipeline girth welds are mainly formed along the circumferential direction of the pipeline, and their defect width in the axial direction of the pipeline is usually less than 1 mm. Even if an ultra-high definition in-pipe detector with an axial sampling interval of 1 mm is used, it is very difficult to effectively detect them.

[0004] Inside the existing in-pipe detector probe, there is usually only one row of detection sensors. Whenever the detector sends a data acquisition trigger signal according to the sampling interval, the probe picks up the pipeline detection signal at the position where the sensor is located. The interval for picking up the pipeline detection signal is equal to the sampling interval of the detector, and it is difficult to effectively detect pipeline defects with a defect axial width less than the sampling interval of the detector. Content of the Utility Model

[0005] The utility model aims to at least solve the problem in the prior art that the interval for picking up the pipeline detection signal by the in-pipe detector probe is equal to the sampling interval of the detector, and it is difficult to effectively detect pipeline defects with a small axial width of defect such as crack-like defects.

[0006] This solution provides a probe for an in-pipe detector that improves the axial sampling density, which is achieved by the following specific technical means: It includes a probe housing installed on the in-pipe detector. A probe circuit board is installed on the probe housing. At the same time, multiple rows of detection sensors are evenly arranged on the probe housing from front to back. The multiple rows of detection sensors are installed on the probe circuit board by means of through-hole assembly welding. The spacing between two adjacent rows of detection sensors in the front and back is calculated and set according to the axial sampling spacing technical index of the in-pipe detector carrying this probe. The following formula is used to calculate this spacing value: L = S × n + S ÷ C × i, where L is the spacing between rows of sensors, S is the axial sampling spacing of the in-pipe detector, n is the sampling spacing multiple (determined according to the mechanical size of the sensor, n = 0, 1, 2...), C is the total number of rows of sensors, and i is the sampling position coefficient (i is an integer, and the value range is 1 ≤ i ≤ C - 1).

[0007] Preferred Technical Solution 1: Probe wear-resistant bodies are provided at both the front and rear ends of the multiple rows of detection sensors on the probe housing. The probe wear-resistant bodies are cylindrical ceramic cylinders. The top surface edge is processed with a chamfer, and the top height is higher than the top height of the multiple rows of detection sensors. The probe wear-resistant bodies are in contact with the pipe wall.

[0008] Preferred Technical Solution 2: The multiple rows of detection sensors are respectively the first row of detection sensors, the second row of detection sensors, the third row of detection sensors, the fourth row of detection sensors, and the fifth row of detection sensors. The probe circuit board and the first row of detection sensors, the second row of detection sensors, the third row of detection sensors, the fourth row of detection sensors, and the fifth row of detection sensors are combined into a whole and installed at the corresponding positions on the probe housing.

[0009] Preferred Technical Solution 3: Each of the first row of detection sensors, the second row of detection sensors, the third row of detection sensors, the fourth row of detection sensors, and the fifth row of detection sensors contains four detection sensors. The detection sensors pick up the pipe detection signal under the trigger of the in-pipe detector data acquisition signal. Triggering the pick-up of the pipe detection signal through the in-pipe detector data acquisition signal helps to improve the synchronization of the probe picking up the pipe detection signal and can improve the quality of the detection data.

[0010] Preferred Technical Solution 4: The remaining space in the probe housing is potted with potting glue. The potting glue used is epoxy resin-based potting glue.

[0011] Preferred Technical Solution 5: The detection sensor is a magnetic sensor, an electromagnetic sensor, an eddy current sensor, or an ultrasonic sensor.

[0012] Adopting the above structure makes this solution have the following beneficial effects:

[0013] 1. By installing multiple rows of detection sensors with a specific spacing between rows, which is calculated and set according to the technical index of the axial sampling spacing of the in-pipe detector equipped with this probe, it is possible to significantly increase the axial sampling density without improving the technical index of the axial sampling spacing of the in-pipe detector, obtain more comprehensive detection data, and help improve the detection ability of the in-pipe detector for circumferential crack defects and other defects with small axial dimensions;

[0014] 2. By using the probe wear-resistant body, the wear resistance of the probe housing is improved, which can effectively protect the probe shell and the sensors inside the probe shell, and extend the service life of the probe;

[0015] 3. By using potting glue to seal the probe circuit board and detection sensors in the probe housing, it can isolate the probe circuit board and detection sensors from contact with the external environment, increase anti-corrosion, anti-fouling and anti-short-circuit capabilities, and also help improve the overall mechanical strength of the probe, enhancing the durability and service life of the probe;

[0016] 4. By using magnetic sensors, electromagnetic sensors, eddy current sensors or ultrasonic sensors as detection sensors, the pipeline can be detected by multiple technical means, which helps to obtain more comprehensive and accurate pipeline detection data and more detailed and accurate detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:

[0018] Figure 1 is a schematic structural diagram of an existing in-pipe detector;

[0019] Figure 2 is a schematic diagram of the position of the detection sensors of an existing in-pipe detector;

[0020] Figure 3 is a schematic diagram of the detection signal acquisition position of an existing in-pipe detector;

[0021] Figure 4 is a schematic structural diagram of this application;

[0022] Figure 5 is a schematic diagram of the position of the detection sensors of the embodiment of this application;

[0023] Figure 6 is a schematic diagram of the detection signal acquisition position of the embodiment of this application.

[0024] Among them, 01, probe wear-resistant body; 02, probe shell; 03, detection sensor; 04, probe circuit board; 05, potting glue; 11, first row of detection sensors; 12, second row of detection sensors; 13, third row of detection sensors; 14, fourth row of detection sensors; 15, fifth row of detection sensors; 21, front view of pipe wall; 22, cross-sectional view of pipe wall; 23, pipeline defects. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] See also Figures 4-5 , the pipeline detector probe with improved axial sampling density, the probe shell 02 installed on the pipeline detector, the probe shell 02 is made of stainless steel and is made by machining, the probe shell 02 surface is spray-welded or spray-coated with wear-resistant material, by spraying or spray-welding the wear-resistant material on the probe shell 02 surface, the wear resistance of the probe shell 02 can be increased, the wear of the probe shell 02 by dirt in the pipeline can be alleviated, and the service life can be improved, a probe circuit board 04 is installed on the probe shell 02, and at the same time, multiple rows of detection sensors are evenly arranged on the probe shell 02 from front to back, and the multiple rows of detection sensors are installed on the probe circuit board 04 by surface mounting, through-hole assembly or lead connection. The axial sampling spacing of the ultra-high-definition internal detector is 1mm, That is, every time the ultra-high-definition internal detector moves forward 1 mm, the detector sends a data acquisition trigger signal. Under the trigger of the data acquisition signal, multiple rows of detection sensors pick up pipeline detection signals. The spacing between two adjacent rows of detection sensors is calculated and set according to the axial sampling spacing technical indicators of the pipeline internal detector equipped with the probe. The spacing value is calculated using the following formula: L = S × n + S ÷ C × i, where L is the spacing between sensor rows, S is the axial sampling spacing of the pipeline internal detector, n is the sampling spacing multiple (based on the mechanical dimensions of the sensor, n = 0, 1, 2...), C is the total number of sensor rows, and i is the sampling position coefficient (i is an integer, with a value of 1≤i≤C-1);

[0027] In this embodiment, the multi-row detection sensors are respectively the first-row detection sensor 11, the second-row detection sensor 12, the third-row detection sensor 13, the fourth-row detection sensor 14, and the fifth-row detection sensor 15. Each of the first-row detection sensor 11, the second-row detection sensor 12, the third-row detection sensor 13, the fourth-row detection sensor 14, and the fifth-row detection sensor 15 includes 4 detection sensors 03. The probe circuit board 04 and the first-row detection sensor 11, the second-row detection sensor 12, the third-row detection sensor 13, the fourth-row detection sensor 14, and the fifth-row detection sensor 15 are combined into a whole and installed at the corresponding positions on the probe housing 02. For this embodiment, in the formula, the axial sampling pitch S of the in-pipe detector takes the value of 1 mm, the sampling pitch multiple n takes the value of 1, the total number of sensor rows C takes the value of 5, and the sampling position coefficient i takes the value of 1. According to the above values, the calculated spacing L between the rows of detection sensors is 1.2 mm. Refer to Figure 5 , in the figure, the spacing between the rows of detection sensors is set to 1.2 mm according to the calculated L value.

[0028] Please refer to Figure 4 , for the in-pipe detector probe that improves the axial sampling density, probe wear-resistant bodies 01 are provided at both the front and rear ends of the multi-row detection sensors on the probe housing 02. The material of the probe wear-resistant body is ceramic, carbide, nitride, or wear-resistant steel. By using the probe wear-resistant body 01, the wear resistance of the probe housing 02 can be increased, and the overall service life can be improved. The probe wear-resistant body 01 is a cylindrical ceramic cylinder, the top edge is chamfered, and the top height is higher than the top height of the multi-row detection sensors. The probe wear-resistant body 01 contacts the inner wall of the pipeline. There are a total of 4 probe wear-resistant bodies provided at the front and rear ends of the probe housing, which are cylindrical ceramic cylinders, and the top edges are chamfered. The probe wear-resistant body 01 is embedded in the corresponding hole positions on the probe housing 02 and fixed with an adhesive.

[0029] Please refer to Figure 4 , for the in-pipe detector probe that improves the axial sampling density, the remaining space in the probe housing 02 is potted with potting glue 05. The potting glue 05 uses epoxy resin-based potting glue, so that the probe circuit board 04 and the detection sensors are sealed in the probe housing 02 through the potting glue 05, which can improve the durability and service life of the probe.

[0030] Refer to Figure 3, which is a schematic diagram of the signal acquisition position of the probe of an existing in-pipe detector. In the figure, the front view pipe wall 21 is a front view schematic diagram of a section of pipe wall with defects, and the cross-sectional view pipe wall 22 is a cross-sectional view schematic diagram of the pipe wall with defects. There is a pipe defect 23 on the pipe wall with defects. The pipe defect 23 is a pipe defect with an axial length of less than 1 mm. The existing in-pipe detector is an ultra-high-definition in-pipe detector, and the axial sampling pitch of the detector is 1 mm. The detector runs in the direction from right to left in the figure and picks up the pipe detection signal every 1 mm forward. The positions where the detection sensor 03 and the probe circuit board 04 pick up the pipe signal multiple times are as Figure 3 shown. It can be seen that the signal is not picked up at the pipe defect 23, and the pipe signal pickup position does not cover the pipe defect 23, so the pipe defect 23 cannot be effectively detected.

[0031] Refer to Figure 6 , which is a schematic diagram of the signal acquisition position of the probe of the embodiment of the present application. In the figure, the front view pipe wall 21 is a front view schematic diagram of a section of pipe wall with defects, and the cross-sectional view pipe wall 22 is a cross-sectional view schematic diagram of the pipe wall with defects. There is a pipe defect 23 on the pipe wall with defects. The pipe defect 23 is a pipe defect with an axial length of less than 1 mm. The in-pipe detection of the embodiment is an ultra-high-definition in-pipe detector, and the axial sampling pitch 24 of the detector is 1 mm. The distance between rows of detection sensors in the figure is set to 1.2 mm according to the calculated L value. The detector runs in the direction from right to left in the figure and picks up the pipe detection signal every 1 mm forward. The first row of detection sensors 11, the second row of detection sensors 12, the third row of detection sensors 13, the fourth row of detection sensors 14, the fifth row of detection sensors 15 and the probe circuit board 04 in the figure are used to illustrate the in-pipe detector of the embodiment, and the positions where the in-pipe detector of the embodiment is located when picking up the pipe detection signal are schematically shown along the left direction. After running, the positions where the first row of detection sensors 11, the second row of detection sensors 12, the third row of detection sensors 13, the fourth row of detection sensors 14 and the fifth row of detection sensors 15 pick up the pipe signal are the positions marked by the boxes shown in the front view pipe wall 21 and the cross-sectional view pipe wall 22. The first row of detection sensors 11, the second row of detection sensors 12, the third row of detection sensors 13, the fourth row of detection sensors 14 and the fifth row of detection sensors 15 pick up the detection signals at different positions, and the axial sampling density reaches 0.2 mm for each sampling. It can be seen that the signal is picked up at the pipe defect 23, and the pipe signal pickup position covers the pipe defect 23. This embodiment can pick up the detection signal at the pipe defect 23.

[0032] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An in-pipe detector probe for improving axial sampling density, comprising a probe housing (02) installed on an in-pipe detector, and a probe circuit board (04) installed on the probe housing (02), characterized in that: Meanwhile, a plurality of rows of detection sensors are uniformly arranged on the probe housing (02) from front to back. The plurality of rows of detection sensors are mounted on the probe circuit board (04). The distance between two adjacent rows of detection sensors in the front and back is calculated by the following formula: L = S×n + S÷C×I (1) Wherein, L is the distance between rows of sensors, S is the axial sampling distance of the in-pipe detector, n is the sampling distance multiple, which is determined according to the mechanical size of the sensor, n = 0, 1, 2..., is the total number of rows of sensors, i is the sampling position coefficient, i is an integer, and the value range is 1 ≤ i ≤ C - 1.

2. The in-pipe detector probe for improving axial sampling density according to claim 1, wherein: Probe wear-resistant bodies (01) are arranged at both the front and rear ends of the plurality of rows of detection sensors on the probe housing (02). The top end of the probe housing (02) is higher than the top ends of the plurality of rows of detection sensors, and contacts the pipe wall through the probe wear-resistant bodies (01).

3. The in-pipe detector probe for improving axial sampling density according to claim 2, characterized in that: The plurality of rows of detection sensors are respectively the first row of detection sensors (11), the second row of detection sensors (12), the third row of detection sensors (13), the fourth row of detection sensors (14) and the fifth row of detection sensors (15).

4. The pipeline internal detector probe for improving axial sampling density according to claim 3, wherein: The first row of detection sensors (11), the second row of detection sensors (12), the third row of detection sensors (13), the fourth row of detection sensors (14) and the fifth row of detection sensors (15) each include four detection sensors (03).

5. The in-pipe detector probe for improving axial sampling density according to claim 2, wherein: The probe wear-resistant body (01) is a cylindrical ceramic cylinder, and the top surface edge is processed with a chamfer.

6. The in-pipe detector probe for improving axial sampling density according to claim 1, wherein: The surface of the probe housing (02) is spray-welded or sprayed with wear-resistant materials.

7. The pipeline internal detector probe for improving axial sampling density according to claim 2, characterized in that: The remaining space in the probe housing (02) is potted with potting glue (05).

8. The pipeline internal detector probe for improving axial sampling density according to claim 4, characterized in that: The detection sensor (03) picks up the pipeline detection signal under the trigger of the in-pipe detector data acquisition signal.

9. The in-pipe detector probe for improving axial sampling density according to claim 4, characterized in that: The detection sensor (03) is a magnetic sensor, an electromagnetic sensor, an eddy current sensor or an ultrasonic sensor.

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