A laser detection device for pipe wall thickness detection

Abstract

The application relates to a laser detection device for pipe wall thickness detection applied to the technical field of pipe wall thickness detection. Through the arrangement of a passive detection module, the passive detection module moves synchronously with an active detection module during measurement. Compared with the prior art, the detection points of the inner wall and the outer wall do not need to be artificially arranged, human error is effectively reduced, the reliability of the detection result is improved, the subsequent maintenance operation is not misled, and meanwhile, the arrangement of a positioning detection unit and a compensation marking unit is matched. During detection, the synchronism of the passive detection module and the active detection module can be detected in real time, the situation that the passive detection module leads or lags behind the active detection module can be obtained in real time, and according to the actual operation condition, the position of the laser detection head on the passive detection module can be compensated and controlled, so that the detection results of the two laser detection heads are for the same point, deviation is not prone to occurring, and the reliability of the detection result is further improved.

Description

TECHNICAL FIELD

[0001] The pipeline wall thickness detection device relates to the technical field of pipeline wall thickness detection. BACKGROUND

[0002] Pipeline thickness detection is a key link for evaluating pipeline safety and residual life, and main detection methods include ultrasonic thickness measurement, X-ray digital imaging, electromagnetic acoustic (EMA) technology and laser detection. Laser detection of wall thickness is a non-contact thickness measurement technology, which detects the distance of the object surface through laser and converts it into an electrical signal output. The conventional detection method is the opposite shooting method: most laser thickness gauges are composed of two laser displacement sensors opposite to each other, and the thickness is determined by calculating the difference between the sensor spacing and the surface spacing of the measured object. This configuration needs to measure the positions of the outer wall and the inner wall of the metal pipe respectively. For example, the fracturing pipeline inner wall detection device and method disclosed in the Chinese patent specification with the publication number CN119778578A and the roll molding storage tank inner coating thickness detection control method and device disclosed in the Chinese patent specification with the publication number CN103267487B.

[0003] However, this opposite shooting detection method requires high consistency of the inner and outer wall measurement points. In actual detection, the inner and outer wall detection points need to be artificially controlled. Since most pipelines are non-transparent structures, it is difficult to align the inner and outer walls, and there is often a certain deviation between the inner and outer wall detection points, resulting in poor reliability of the detection results. SUMMARY

[0004] In view of the above prior art, the technical problem to be solved by the present application is that the inner and outer wall detection points are prone to deviation during detection, affecting the reliability of the detection results.

[0005] To solve the above problems, the present application provides a laser detection device for pipeline wall thickness detection, which comprises a remote control terminal and a main detection module and a passive detection module installed on the pipeline. The bottom of the main detection module is provided with a walking module, and the end face of the passive detection module close to the main detection module is movably embedded with a plurality of balls. The end of the main detection module and the passive detection module away from each other is provided with a connecting rod, and the end of the two connecting rods away from each other is fixedly connected with a horizontal rod. The end of the two horizontal rods close to each other is provided with a laser detection head, and the two laser detection heads are vertically corresponding.

[0006] The active detection module is internally fixed with an inlaid outer annular magnet and an inner annular magnet, the outer annular magnet and the inner annular magnet are coaxially arranged, and the inner annular magnet is located inside the outer annular magnet. The passive detection module is internally drilled with an alignment detection cavity, and an alignment detection unit is installed inside the alignment detection cavity. The alignment detection unit directly faces the inner annular magnet.

[0007] The alignment detection unit comprises a bottom plate fixedly connected to the bottom of the alignment detection cavity, a plurality of sensing units respectively installed at the top of the alignment detection cavity, and a plurality of magnetic control touch columns movably inserted into the bottom plate, and the plurality of magnetic control touch columns correspond to the plurality of sensing units respectively.

[0008] In the above-mentioned laser detection device for pipeline wall thickness detection, by setting the passive detection module, it moves synchronously with the active detection module during measurement. Compared with the prior art, it does not need to manually control the detection points of the inner and outer walls, effectively reduces human error, improves the reliability of the detection result, and reduces the misleading of subsequent maintenance and processing operations.

[0009] As a further improvement of the present application, the passive detection module and the magnetic control touch column are both made of metal iron material, and the outer annular magnet and the inner annular magnet are both made of strong magnetic material.

[0010] As a further improvement of the present application, the plurality of sensing units are all pressure sensors, and the plurality of pressure sensors are signal connected with the remote control terminal.

[0011] As another improvement of the present application, the alignment detection unit further comprises an electrical element installed at the middle of the top of the alignment detection cavity, the plurality of sensing units and the electrical element are connected in series with each other, and the electrical element is signal connected with the remote control terminal.

[0012] As a further improvement of the present application, the sensing unit comprises a fixed contact piece fixedly connected to the top of the alignment detection cavity, a movable contact piece located below the fixed contact piece, and a limiting ring sleeve fixedly connected between the outer wall of the movable contact piece and the top of the alignment detection cavity, and the fixed contact piece is located inside the limiting ring sleeve.

[0013] As a further improvement of the present application, the movable contact piece directly faces the fixed contact piece, and the limiting ring sleeve is made of elastic material, and when not under stress, the two do not contact each other.

[0014] As a further improvement of the present application, the connecting rod on the active detection module is fixedly connected with the active detection module, the connecting rod on the passive detection module is connected with the passive detection module through the electric sliding table, and a compensation marking unit is further arranged between the two cross rods. The compensation marking unit comprises a control printing strip fixedly connected to the lower end of the cross rod corresponding to the active detection module, a plurality of printing strips fixedly connected to the upper end of the cross rod corresponding to the passive detection module, and a high-definition camera installed at the side end of the passive detection module facing the laser detection head. The shooting end of the high-definition camera faces the plurality of printing strips.

[0015] As a further improvement of the present application, the control printing strip is made of a strong magnetic material, the plurality of printing strips are hollow transparent structures, and the printing strips are filled with iron powder. The control printing strip corresponds to the printing strip in the middle, and the control printing strip and the plurality of printing strips are staggered with the active detection module.

[0016] In summary, through the arrangement of the passive detection module, it moves synchronously with the active detection module during measurement. Compared with the prior art, it does not need to manually arrange the detection points of the inner and outer walls, effectively reduces human error, improves the reliability of the detection result, and reduces the misleading of subsequent maintenance and processing operations. At the same time, with the arrangement of the alignment detection unit and the compensation marking unit, the synchronization of the passive detection module and the active detection module can be detected in real time during detection, the situation that the passive detection module is ahead of or lags behind the active detection module can be obtained in real time, and according to the actual operation, the position of the laser detection head on the passive detection module can be compensated and controlled, so as to effectively ensure that the detection results of the two laser detection heads are for the same point, and deviation is not easy to occur, further improving the reliability of the detection result. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the first embodiment of the present application during detection;

[0018] Figure 2 It is a perspective view of the first embodiment of the present application;

[0019] Figure 3 It is a front view of the first embodiment of the present application during detection;

[0020] Figure 4 It is a front view of the first embodiment of the present application;

[0021] Figure 5 It is a sectional view of the passive detection module part of the first embodiment of the present application;

[0022] Figure 6 It is a top view of the alignment detection unit of the first embodiment of the present application;

[0023] Figure 7The cross-sectional view of the passive detection module part of the second embodiment of the application is shown in the figure.

[0024] Figure 8 The force before and after the sensing unit of the second embodiment of the application is shown in the figure.

[0025] Figure 9 The top view of the alignment detection unit of the second embodiment of the application when normally turned on is shown in the figure.

[0026] Figure 10 The top view of the alignment detection unit of the second embodiment of the application when not turned on is shown in the figure.

[0027] Figure 11 The perspective view of the third embodiment of the application is shown in the figure.

[0028] Figure 12 The mark formed by the compensation mark unit in different situations of the third embodiment of the application is shown in the figure.

[0029] Explanation of the figure:

[0030] 1 active detection module, 2 passive detection module, 3 crossbar, 4 laser detection head, 51 outer ring-shaped magnet, 52 inner ring-shaped magnet, 61 bottom plate, 62 magnetic control touch column, 63 sensing unit, 631 fixed touch piece, 632 movable touch piece, 633 limit ring sleeve, 7 electrical element, 801 high-definition camera, 81 control printing strip, 82 printing strip. DETAILED DESCRIPTION

[0031] The three embodiments of the application are described in detail below in combination with the figures.

[0032] First embodiment:

[0033] Figures 1-2 It is shown that a laser detection device for pipe wall thickness detection includes a remote control terminal and an active detection module 1 and a passive detection module 2 installed on the pipe. The active detection module 1 is installed with a walking module at the bottom. The passive detection module 2 is movably embedded with a plurality of balls near the end face of the active detection module 1, so that the active detection module 1 can move in the inner wall of the pipe through the walking module to detect the thickness of different parts. When the passive detection module 2 moves with the active detection module 1, the balls can make it in rolling friction with the surface of the pipe, which is convenient for movement. The end of the active detection module 1 and the passive detection module 2 away from each other is installed with a connecting rod. The end of the two connecting rods away from each other is fixedly connected with a crossbar 3. The end of the two crossbars 3 close to each other is installed with a laser detection head 4. The two laser detection heads 4 are vertically corresponding, such as Figure 3When detecting, the active detection module 1 is placed in the pipeline, the passive detection module 2 is attached to the outer wall of the pipeline, and under the magnetic attraction of the outer annular magnet 51, the passive detection module 2 is stably attached to the outer wall of the pipeline, and when the active detection module 1 moves, the passive detection module 2 moves synchronously, and then the two laser detection heads 4 can simultaneously detect the thickness of the same area, and the two groups of data can be verified with each other to improve the reliability of the detection result.

[0034] As Figures 3-4 The outer annular magnet 51 and the inner annular magnet 52 are coaxially arranged, and the inner annular magnet 52 is located inside the outer annular magnet 51, and a magnetic attraction is generated between the outer annular magnet 51 and the inner annular magnet 52, so that the passive detection module 2 can move synchronously with the active detection module 1, realizing synchronous detection inside and outside a single point. The passive detection module 2 and the magnetic control touch column 62 are both made of metal iron material, the outer annular magnet 51 and the inner annular magnet 52 are both made of strong magnetic material, a positioning detection cavity is excavated in the passive detection module 2, a positioning detection unit is installed in the positioning detection cavity, the positioning detection unit faces the inner annular magnet 52, and the positioning detection unit comprises a bottom plate 61 fixedly connected to the bottom of the positioning detection cavity, a plurality of sensing units 63 respectively installed at the top of the positioning detection cavity, and a plurality of magnetic control touch columns 62 movably inserted into the bottom plate 61, and the plurality of magnetic control touch columns 62 correspond to the plurality of sensing units 63 respectively.

[0035] As Figures 5-6 The plurality of sensing units 63 are all pressure sensors, the plurality of pressure sensors are signal-connected with the remote control terminal, the movement of the passive detection module 2 and the active detection module 1 can be detected in real time through the positioning detection unit, so that the out-of-sync condition can be found in time, when the two move synchronously, it indicates that the positions are aligned, at this time, the plurality of magnetic control touch columns 62 can all be subjected to the magnetic attraction of the inner annular magnet 52, and then move upward and respectively press the plurality of sensing units 63, so that the plurality of sensing units 63 synchronously generate force data, at this time, the remote control terminal can simultaneously receive the pressure signals fed back by the plurality of sensing units 63, when the movement of the passive detection module 2 and the active detection module 1 deviates, the positioning detection unit will deviate from the inner annular magnet 52, and then one or more magnetic control touch columns 62 will be misaligned with the inner annular magnet 52, so that the remote control terminal can only receive part of the pressure signals, and when detecting, whether the passive detection module 2 and the active detection module 1 are synchronous can be effectively judged based on the pressure signals received by the remote control terminal, the out-of-sync condition can be found in time, and corresponding adjustment measures can be taken, so as to improve the reliability of the detection result.

[0036] In summary, by setting the passive detection module 2, it moves synchronously with the active detection module during measurement. Compared with the prior art, it does not need to manually arrange the detection points on the inner and outer walls, effectively reduces human error, improves the reliability of the detection result, and reduces the misleading of subsequent maintenance and processing operations. At the same time, with the setting of the alignment detection unit and the compensation marker unit, the synchronism of the passive detection module 2 and the active detection module 1 can be detected in real time during detection, the situation that the passive detection module 2 leads or lags behind the active detection module 1 can be obtained in real time, and according to the actual operation, the position of the laser detection head 4 on the passive detection module 2 can be compensated and controlled, so as to effectively ensure that the detection results of the two laser detection heads 4 are for the same point, and deviation is not easy to occur, further improving the reliability of the detection result.

[0037] Second embodiment:

[0038] The present embodiment is based on the first embodiment, and changes the specific setting mode of the alignment detection unit, and the remaining parts remain the same as the first embodiment.

[0039] As Figure 7 The alignment detection unit further comprises an electrical element 7 installed in the middle of the top end of the alignment detection cavity. The plurality of sensing units 63 and the electrical element 7 are connected in series with each other, and the electrical element 7 is connected to the remote control terminal.

[0040] As Figure 8 The sensing unit 63 comprises a fixed contact 631 fixedly connected to the top of the alignment detection cavity, a movable contact 632 located below the fixed contact 631, and a limiting ring 633 fixedly connected between the outer wall of the movable contact 632 and the top of the alignment detection cavity. The fixed contact 631 is located inside the limiting ring 633, the movable contact 632 faces the fixed contact 631, and the limiting ring 633 is made of elastic material and does not contact each other when not stressed. Figure 9 Only when the passive detection module 2 is opposite to the active detection module 1, the plurality of sensing units 63 are coaxial with the inner annular magnet 52, and the plurality of magnetic control contact columns 62 are subjected to magnetic attraction force, and then approach the plurality of sensing units 63, can the plurality of movable contacts 632 approach the fixed contact 631 and abut against it. At this time, the circuit in which the electrical element 7 is located is turned on, so that the electrical element 7 is powered on. Figure 10 When the passive detection module 2 is misaligned with the active detection module 1, part of the magnetic control contact column 62 will be misaligned with the inner annular magnet 52, so that the corresponding sensing unit 63 cannot be stressed, and the circuit in which the electrical element 7 is located cannot be powered on. At this time, the remote control terminal can judge whether the passive detection module 2 is misaligned with the active detection module 1 according to whether the electrical element 7 is powered on. Compared with the first embodiment, only one electrical element 7 is provided in the present embodiment to replace a plurality of pressure sensors, which can effectively reduce the number of electrical elements and reduce the cost.

[0041] The third embodiment:

[0042] The third embodiment is based on the first or second embodiment, and changes the specific setting mode of the position detection unit, and the remaining parts remain consistent with the first or second embodiment.

[0043] As Figure 11 , the connecting rod on the active detection module 1 is fixedly connected with the active detection module 1, the connecting rod on the passive detection module 2 is connected with the passive detection module 2 through the electric sliding table, and the two cross bars 3 are further provided with a compensation marking unit. The compensation marking unit includes a control printing strip 81 fixedly connected to the lower end of the cross bar 3 corresponding to the active detection module 1, a plurality of printing strips 82 fixedly connected to the upper end of the cross bar 3 corresponding to the passive detection module 2, and a high-definition camera 801 installed on the side end of the passive detection module 2 facing the laser detection head 4. The shooting end of the high-definition camera 801 faces the plurality of printing strips 82.

[0044] The control printing strip 81 is made of strong magnetic material, the plurality of printing strips 82 are hollow transparent structures, and the inside of the printing strip 82 is filled with iron powder. When the control printing strip 81 corresponds to the printing strip 82, the iron powder inside will gather upward and adhere to the upper surface of the printing strip 82, thereby causing the surface to have obvious marks. The high-definition camera 801 can obtain image information of the marks. According to the position of the marks formed on the plurality of printing strips 82, it can be effectively judged whether the passive detection module 2 moves synchronously with the active detection module 1, and then it can be judged whether the two laser detection heads 4 are misaligned, and it can be limitedly judged whether the passive detection module 2 moves forward or backward relative to the active detection module 1. The control printing strip 81 corresponds to the printing strip 82 in the middle, and the control printing strip 81 and the plurality of printing strips 82 are misaligned with the active detection module 1, such as Figure 12 When the two laser detection heads 4 are completely vertically corresponding, that is, the movement of the passive detection module 2 is consistent with the active detection module 1, at this time the position of the lower cross bar 3 is in the middle, when the passive detection module 2 moves forward relative to the active detection module 1, it will cause the marks to move to the printing strip 82 close to the laser detection head 4. At this time, the entire cross bar 3 is controlled to move backward by the electric sliding table, so that the marks return to the middle printing strip 82, indicating that the two laser detection heads 4 are corresponding again, and at this time the detected by the two is the thickness of the pipeline in the same area. When the marks appear on the printing strip 82 of the laser detection head 4, it indicates that the passive detection module 2 moves too slowly relative to the active detection module 1, at this time the entire cross bar 3 is controlled to move forward by the electric sliding table, so that the marks return to the middle printing strip 82.

[0045] In the embodiment, the dislocation direction of the passive detection module 2 can be effectively judged, and the position of the laser detection head 4 can be compensated, so that the position of the laser detection head 4 on the passive detection module 2 can be corresponded again, and the data detected by the two detection modules is effectively ensured to be the same area of the pipeline, so that the reliability of the detection result is higher. Compared with the first two embodiments, when the positions of the two laser detection heads 4 are offset, the position compensation can be automatically performed, the dependence on manpower maintenance is reduced, and the detection efficiency is higher.

[0046] In combination with the actual needs, the above-mentioned embodiments adopted by the present application are not limited to the above-mentioned embodiments, and various changes made within the knowledge of those skilled in the art without departing from the concept of the present application still fall within the protection scope of the present application.

Claims

1. A laser inspection device for detecting pipe wall thickness, characterized in that: It includes a remote control terminal and an active detection module (1) and a passive detection module (2) installed on the pipeline. The active detection module (1) is equipped with a walking module at the bottom. The passive detection module (2) has multiple balls movably embedded on its end face near the active detection module (1). The active detection module (1) and the passive detection module (2) are each equipped with a connecting rod at their ends that are far apart from each other. The ends of the two connecting rods that are far apart from each other are each fixedly connected with a crossbar (3). The ends of the two crossbars (3) that are close to each other are each equipped with a laser detection head (4). The two laser detection heads (4) are vertically aligned. The active detection module (1) is internally fixedly embedded with an outer ring magnet (51) and an inner ring magnet (52). The outer ring magnet (51) and the inner ring magnet (52) are coaxially arranged, and the inner ring magnet (52) is located inside the outer ring magnet (51). The passive detection module (2) has an alignment detection cavity inside, and an alignment detection unit is installed inside the alignment detection cavity. The alignment detection unit is directly opposite the inner ring magnet (52). The alignment detection unit includes a base plate (61) fixedly connected to the bottom of the alignment detection cavity, a plurality of sensing units (63) respectively installed at the top of the alignment detection cavity, and a plurality of magnetically controlled contact posts (62) movably inserted in the base plate (61), and the plurality of magnetically controlled contact posts (62) correspond to the plurality of sensing units (63) respectively. The connecting rod on the active detection module (1) is fixedly connected to the active detection module (1), and the connecting rod on the passive detection module (2) is connected to the passive detection module (2) through an electric slide. A compensation marking unit is also provided between the two crossbars (3). The compensation marking unit includes a control strip (81) fixedly connected to the lower end of the crossbar (3) corresponding to the active detection module (1), multiple printing strips (82) fixedly connected to the upper end of the crossbar (3) corresponding to the passive detection module (2), and a high-definition camera (801) installed on the end of the passive detection module (2) facing the laser detection head (4). The shooting end of the high-definition camera (801) faces the multiple printing strips (82).

2. The laser inspection device for pipe wall thickness detection according to claim 1, characterized in that: The passive detection module (2) and the magnetic control contact post (62) are both made of iron, and the outer ring magnet (51) and the inner ring magnet (52) are both made of strong magnetic material.

3. The laser inspection device for pipe wall thickness detection according to claim 1, characterized in that: The alignment detection unit also includes an electrical component (7) installed at the top center of the alignment detection cavity. The multiple sensing units (63) and the electrical component (7) are connected in series, and the electrical component (7) is connected to the remote control terminal signal.

4. The laser inspection device for pipe wall thickness detection according to claim 3, characterized in that: The sensing unit (63) includes a fixed contact (631) fixedly connected to the top of the alignment detection cavity, a movable contact (632) located below the fixed contact (631), and a limiting ring (633) fixedly connected between the outer wall of the movable contact (632) and the top of the alignment detection cavity. The fixed contact (631) is located inside the limiting ring (633).

5. A laser inspection device for pipe wall thickness detection according to claim 4, characterized in that: The movable contact (632) is directly opposite the fixed contact (631), and the limiting ring (633) is made of elastic material, and the two do not contact each other when no force is applied.

6. The laser inspection device for pipe wall thickness detection according to claim 1, characterized in that: The plurality of sensing units (63) are all pressure sensors, and the plurality of pressure sensors are connected to a remote control terminal.

7. A laser inspection device for pipe wall thickness detection according to claim 1, characterized in that: The control strip (81) is made of a strong magnetic material, and the multiple printing strips (82) are hollow and transparent structures, and the printing strips (82) are filled with iron powder. The control strip (81) corresponds to the printing strip (82) in the middle, and the control strip (81) and the multiple printing strips (82) are misaligned with the active detection module (1).

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