Laser detection device and detection method for PCCP pipeline

Abstract

The present invention provides a laser detection device and detection method for a PCCP pipeline, comprising a PCCP pipeline, a circle of steel pipes installed in the pipe wall of the PCCP pipeline, a front moving plate and a rear moving plate placed in the PCCP pipeline, the front side of the front moving plate is rotatably connected to a rotating pipe, the front side of the front moving plate is located in the rotating pipe and an angle adjustment seat is installed, a laser rangefinder is installed at the front end of the angle adjustment seat, the laser rangefinder is used to measure the length of each section of the pipeline and the distance between the device and the bend of the PCCP pipeline, and the laser rangefinder is driven by an angle adjustment motor to complete the up and down and left and right angle adjustment. The device can be autonomously and stably moved in the pipeline by remote control, so that the laser distance measurement is consistent with the pipeline axis, the measurement is accurate, the length of each straight section and the bending section of the pipeline can be completed, and the wall thickness of the entire section of the pipeline can be uniformly detected in the circumferential direction, the wall thickness is auxiliary monitored, the detection accuracy is improved, and the corrosion of the pipe wall is further understood.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline thickness measurement, and in particular to a laser detection device and a detection method for a PCCP pipeline. Background Art

[0002] PCCP pipe refers to a pipe made by winding annular prestressed steel wire on a high-strength concrete pipe core with a steel cylinder, and then spraying a dense cement mortar protective layer on it. It can be widely used in long-distance water transmission and water supply trunk lines, pressure inverted siphon projects, urban water supply projects, industrial pressure water transmission pipelines, power plant circulating water project sewer pipes, pressure sewage main pipes, etc.

[0003] At present, the straightness measurement of pipelines mostly adopts the straightness measurement method based on light reference, such as laser measurement method: push the laser to move in the measured pipeline, and the laser projects the laser on the PSD chip. When the pipeline is bent, the coordinate value of the laser energy center on the PSD chip will change. The straightness error of the pipeline can be calculated by calculating the coordinate change value. This method requires that the laser projected by the laser strictly coincides with the axis of the pipeline. In actual operation, the use of a manual push rod to push the laser to move in the pipeline will cause additional jitter, resulting in measurement errors, and it is also impossible to measure the length of each curved part of the pipeline.

[0004] In addition, during the use of the pipeline, the pipeline will change the uniformity of the pipeline wall thickness due to long-term friction and corrosion of the transmission medium. For buried pipelines, how to synchronously complete the detection of pipeline wall thickness during the laser ranging process is of practical significance to address the above issues. The ultrasonic thickness gauge is used to detect the wall thickness. It uses the relationship between the round-trip propagation time of the ultrasonic pulse in the material and the speed of sound and the sound path to obtain the thickness of the inspected workpiece. However, it cannot move autonomously in the pipeline to complete the detection process of the entire pipeline and the circumferential pipe wall. In addition, when the pipe wall has small pitting corrosion or a shape defect that diverges the sound wave, the ultrasonic thickness measurement will be inaccurate and it will be impossible to further understand the corrosion situation. Summary of the invention

[0005] In view of the above problems, the present invention provides a laser detection device and detection method for PCCP pipelines. The device can be remotely controlled to move autonomously and stably in the pipeline, so that the laser ranging is consistent with the pipeline axis and the measurement is accurate. The length of each straight section and curved section of the pipeline can be completed, and the wall thickness of the entire pipeline can be uniformly detected in the circumferential direction, and the wall thickness can be auxiliary monitored to improve the detection accuracy and further understand the corrosion condition of the pipe wall.

[0006] To solve the above problems, the technical solution adopted by the present invention is:

[0007] A laser detection device for a PCCP pipeline comprises a PCCP pipeline, wherein a circle of steel pipe is installed in the pipe wall of the PCCP pipeline, a front movable plate and a rear movable plate are placed in the PCCP pipeline, the front side of the front movable plate is rotatably connected with a rotating pipe, the front side of the front movable plate is located in the rotating pipe and an angle adjustment seat is installed, a laser distance measuring head is installed at the front end of the angle adjustment seat, the laser distance measuring head is used to measure the length of each section of the pipeline and the distance between the device and the turning point of the PCCP pipeline, a pair of rotating arms, a fixed arm and a connecting arm are fixedly installed on the circumferential side wall of the rotating pipe, an ultrasonic thickness measuring probe is embedded at the ends of the pair of rotating arms, a magnetic ball that contacts the pipe wall is elastically installed at the end of the fixed arm, the magnetic ball magnetically attracts the steel pipe, a monitoring component for monitoring the displacement of the magnetic ball is installed in the fixed arm, and the end of the connecting arm is fixedly connected with A mounting seat, the side walls of which are evenly distributed with a plurality of retractable probes, a detection component for detecting the retraction amount of the probes is also installed in the mounting seat, a plurality of rollers that abut against the tube wall are installed on the circumferential side walls of the front movable plate and the rear movable plate, a plurality of elastic guide rods that penetrate the rear movable plate are fixedly connected to the rear side of the front movable plate, a plurality of arc-shaped abutment plates that can be retracted and extended synchronously are also installed on the circumferential side walls of the front movable plate and the rear movable plate, a plurality of the arc-shaped abutment plates extend out to abut against the tube wall for fixing the position of the front movable plate or the rear movable plate, a plurality of telescopic cylinders are fixed circumferentially on the front side of the rear movable plate, a strip-shaped telescopic airbag with independently controllable retraction amount is installed in the plurality of telescopic cylinders, the telescopic end of the strip-shaped telescopic airbag is fixedly connected to the front movable plate, and a controller for remotely controlling the retraction of the arc-shaped abutment plate, the retraction of the strip-shaped telescopic airbag and data transmission is installed on the rear movable plate.

[0008] Preferably, a motor electrically connected to the controller is installed in the front moving plate, a gear is fixedly connected to the output end of the motor, and a gear ring meshing with the gear is fixed to the side wall of the rotating tube.

[0009] Preferably, the monitoring component includes a monitoring cavity arranged in the end of the fixed arm, a thin abutment plate is provided in the monitoring cavity, a first spring is elastically installed on both sides of the thin abutment plate, the side wall of the thin abutment plate is fixedly connected to a abutment rod extending from the fixed arm, the magnetic ball is fixedly installed at the end of the abutment rod, and an infrared sensor for monitoring the position of the thin abutment plate is embedded in the inner wall of the monitoring cavity, and the infrared sensor is electrically connected to the controller.

[0010] Preferably, a plurality of telescopic cavities are evenly distributed in the mounting seat, and the tail ends of the plurality of probes extend into the corresponding telescopic cavities and are elastically connected to a second spring, and the second spring is electrically connected to the controller.

[0011] Preferably, the detection component includes detection cavities evenly distributed in the mounting base, the tail end of the probe is fixedly connected to a pull rod extending into the detection cavity, the extended end of the pull rod is fixedly connected to a resistance coil, and an electrical contact in contact with the resistance coil is installed in the detection cavity, and the electrical contact and the resistance coil are both electrically connected to the controller.

[0012] Preferably, a gas tank is fixedly installed on the rear side of the rear movable plate, and an air pump connected to the air outlet end of the gas tank is installed inside the rear movable plate. The air outlet end of the air pump is connected to multiple air pipes, and the ends of the multiple air pipes are connected to the corresponding strip-shaped telescopic air bags. Solenoid valves are installed in the multiple air pipes, and the solenoid valves and the air pump are electrically connected to the controller.

[0013] Preferably, oil tanks are fixedly installed on the opposite sides of the front movable plate and the rear movable plate, and oil pumps connected to the corresponding oil tanks are installed in the front movable plate and the rear movable plate, and the oil outlet ends of the oil pumps are connected to multiple oil pipes, and multiple oil chambers are provided in the circumferential side walls of the front movable plate and the rear movable plate, and the ends of the oil pipes are connected to the corresponding oil chambers. A piston is provided in the oil chamber, and a side wall of the piston is fixedly connected to a column extending out of the oil chamber, and the end of the column is fixedly connected to the corresponding arc-shaped counter plate, and the multiple arc-shaped counter plates are staggered with the multiple rollers, and the oil pump is electrically connected to the controller.

[0014] Preferably, the elastic guide rod, the corresponding roller and the strip-shaped telescopic airbag are all on the same straight line in the radial direction.

[0015] Preferably, a remote control module and a data transmission module are electrically connected in the controller, the remote control module is remotely connected to a remote controller, the data transmission module is wirelessly connected to a data feedback instrument, the data transmission module is electrically connected to a laser rangefinder, an ultrasonic thickness measuring probe, a monitoring component and a detection component, and a battery is built in the rear movable plate.

[0016] The present invention also provides a method for detecting the wall thickness of a PCCP pipe, comprising the following steps:

[0017] S1. Place the front moving plate and the rear moving plate in the pipe mouth of the PCCP pipeline, and multiple rollers are against the pipe wall. When moving, the oil pump in the rear moving plate is first started through the remote control and the controller, and the hydraulic oil in the corresponding oil tank is pumped into multiple oil chambers through the oil pipes respectively. The arc-shaped abutment plate is driven to extend and abut against the pipe wall through the piston and the abutment column to fix the position of the rear moving plate. Then, the air pump is started to synchronously pump the gas in the gas tank into multiple strip-shaped telescopic airbags through the air pipe to inflate and expand them, so as to push the front moving plate forward in the pipeline. After the front moving plate moves forward to the limit position, the position of the front moving plate is fixed by the arc-shaped abutment plate, and the air pump rotates in the opposite direction to draw back the gas in the strip-shaped telescopic airbag, so as to pull the rear moving plate forward, thereby automatically completing the moving process in the pipeline;

[0018] S2. During the straight-line movement, the laser distance measuring head measures the distance to the center of the bend to obtain the length of the straight-line segment. When the movement encounters a bend, the laser distance measuring head detects that the distance reaches the preset value. At this time, after the front moving plate reaches the bend, the opening and closing degree of the corresponding air pipe is controlled by the solenoid valve, and then the extension and contraction degree of multiple strip telescopic airbags are individually controlled. The extension length of the strip telescopic airbag located on the outside is greater than that of the inside, so that the turning process can be realized. After the turning, the laser distance measuring head measures the length of the turning segment;

[0019] S3. During the movement, the motor is started, and the gear and the ring gear drive the rotating pipe to rotate 360° forward and backward. The ultrasonic thickness probe can send ultrasonic waves to the pipe wall, and the data can be transmitted wirelessly. The thickness of the pipe wall can be calculated by the ultrasonic thickness gauge. With the movement, the thickness detection of the entire section of the pipeline can be completed, and the corrosion of the pipe wall can be analyzed;

[0020] S4. The rotating tube drives the magnetic ball to rotate around the tube wall synchronously. The magnetic ball attracts the steel tube under the action of magnetic attraction, and then tightly contacts the tube wall. It can move radially with the ups and downs of the tube wall. The infrared sensor monitors the number of times the thin plate passes, and then assists the ultrasonic thickness probe in thickness monitoring to determine the corrosion position of the tube wall.

[0021] S5. In order to further understand the corrosion of the pipe wall, the mounting base is turned to the corrosion position detected in S3 and S4. The controller disconnects multiple second springs synchronously. The second springs are reset to pop out multiple evenly distributed probes, which hit the corroded part of the pipe wall. Since the corrosion surface is uneven, the depth of the probe contact is different, which makes the position of the electrical contact contacting the resistance coil different. The principle of sliding rheostat is used to detect different current sizes to obtain the depth of corrosion at various places on the corrosion surface.

[0022] The beneficial effects of the present invention are:

[0023] 1. By installing the front moving plate, the rear moving plate, the arc-shaped abutment plate, the strip-shaped telescopic airbag, the laser ranging head and the controller, the front moving plate and the rear moving plate are placed in the pipe mouth of the PCCP pipeline, and multiple rollers abut against the pipe wall. When moving, the oil pump in the rear moving plate is first started by the remote control and the controller, and the hydraulic oil in the corresponding oil tank is pumped into multiple oil chambers through the oil pipes respectively, and the arc-shaped abutment plate is driven to extend and abut against the pipe wall through the piston and the abutment column to fix the position of the rear moving plate. Then, the air pump is started to synchronously pump the gas in the gas tank into the multiple strip-shaped telescopic airbags through the air pipe to inflate and expand them, so as to push the front moving plate forward in the pipeline. After the front moving plate moves forward to the limit position, the position of the front moving plate is fixed by the arc-shaped abutment plate, and the air pump rotates in the opposite direction to draw back the gas in the strip-shaped telescopic airbag, so as to pull the rear moving plate forward, thereby automatically completing the moving process in the pipeline. The laser ranging head measures the distance to the center of the bend, and the length of the straight line segment can be obtained, and the measurement is accurate.

[0024] 2. By installing the solenoid valve and the elastic guide rod, when the movement encounters a bend, the laser rangefinder monitors the distance to the bend in front and reaches the preset value before the bend. At this time, the angle adjustment motor drives the laser rangefinder to complete the up and down and left and right angle adjustment, and further measures the distance from the laser rangefinder to the upper, lower, left and right of the bend, and then determines whether the bend angle is upward, downward, left or right. After the front moving plate reaches the bend, the opening and closing degree of the corresponding air pipe is controlled by the solenoid valve, and then the extension degree of multiple strip telescopic airbags is controlled separately. The extension length of the strip telescopic airbag on the outside is greater than that on the inside, so that the turning process can be realized. Multiple elastic guide rods can avoid the dislocation of the front moving plate and the rear moving plate during the movement, and adaptive bending occurs when the curve moves, realizing the guiding role in the straight line and curve movement. After the bend, the laser rangefinder completes the length measurement of the bent section, and the length measurement of each section of the pipeline can be automatically completed.

[0025] 3. By installing the ultrasonic thickness gauge probe, starting the motor, and driving the rotating pipe to rotate 360° forward and backward through the gears and gear rings, the ultrasonic thickness gauge probe can emit ultrasonic waves to the pipe wall, and the data can be transmitted wirelessly. The pipe wall thickness can be calculated by the ultrasonic thickness gauge, and the thickness of the entire pipeline can be detected by moving.

[0026] 4. By installing a magnetic ball, a thin abutment plate and an infrared sensor, the rotating tube synchronously drives the magnetic ball to rotate around the tube wall. The magnetic ball attracts the steel tube under the action of magnetic attraction and then tightly contacts the tube wall. The magnetic ball can move radially with the ups and downs of the tube wall. The infrared sensor monitors the number of times the thin abutment plate passes, assisting the thickness monitoring of the ultrasonic thickness gauge probe to avoid inaccurate ultrasonic thickness measurement when there is small pitting corrosion on the tube wall or shape defects that diverge the sound wave, thereby determining the location of the tube wall corrosion.

[0027] 5. By installing evenly distributed probes and detection components, when the ultrasonic thickness probe detects the thinner part of the pipe wall, and the magnetic ball assists in monitoring the uneven thickness, the corrosion position is determined, and the controller disconnects multiple second springs synchronously. The second springs reset and eject multiple evenly distributed probes, which contact the corroded part of the pipe wall. Due to the uneven corrosion surface, the depth of the probe contact is different, which makes the electrical contact contact the resistance coil at different positions. The sliding rheostat principle is used to detect different current sizes, and the depth of corrosion at various parts of the corrosion surface can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a rear perspective view of the present invention;

[0029] Figure 2 It is a front perspective view of the present invention;

[0030] Figure 3It is a structural cross-sectional view of the present invention;

[0031] Figure 4 A cross-sectional view of the front moving plate and the rear moving plate proposed by the present invention;

[0032] Figure 5 A front view of the rear movable plate proposed by the present invention;

[0033] Figure 6 A front cross-sectional view of the rear movable plate proposed by the present invention;

[0034] Figure 7 A front view of the rotating tube proposed by the present invention;

[0035] Figure 8 A cross-sectional view of a fixed arm proposed by the present invention;

[0036] Fig. 9 A cross-sectional view of the mounting base proposed by the present invention;

[0037] Fig.10 This is a schematic diagram of the linear movement detection state proposed by the present invention;

[0038] Fig.11 This is a schematic diagram of the curve movement detection state proposed by the present invention.

[0039] In the figure: 1 PCCP pipeline, 2 steel pipe, 3 rear moving plate, 4 front moving plate, 5 elastic guide rod, 6 gas tank, 7 strip telescopic airbag, 8 rotary arm, 9 ultrasonic thickness probe, 10 roller, 11 rotating tube, 12 fixed arm, 13 mounting seat, 14 magnetic ball, 15 controller, 16 telescopic cylinder, 17 laser distance measuring head, 18 motor, 19 gear, 20 solenoid valve, 21 air pipe, 22 air pump, 23 oil tank, 24 oil pump, 25 oil pipe, 26 arc-shaped abutment plate, 27 oil chamber, 28 piston, 29 telescopic chamber, 30 probe, 31 second spring, 32 pull rod, 33 electric contact, 34 resistance coil, 35 detection chamber, 36 abutment rod, 37 monitoring chamber, 38 first spring, 39 thin abutment plate, 40 infrared sensor, 41 angle adjustment seat. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0042] Reference Figure 1-9 A laser detection device for a PCCP pipeline comprises a PCCP pipeline 1, a circle of steel pipe 2 is installed in the pipe wall of the PCCP pipeline 1, a front movable plate 4 and a rear movable plate 3 are placed in the PCCP pipeline 1, a rotating tube 11 is rotatably connected at the front center of the front side of the front movable plate 4, an angle adjustment seat 41 is installed in the rotating tube 11 at the front side of the front movable plate 4, a laser distance measuring head 17 is installed at the front end of the angle adjustment seat 41, and the laser distance measuring head 17 is used to measure the length of each section of the pipeline and the distance between the device and the turning point of the PCCP pipeline 1.

[0043] Furthermore, the angle adjustment seat 41 is an angle adjustment motor, which can realize the up and down and left and right angle adjustment. After the laser ranging head 17 measures the distance between the device and the turning point of the PCCP pipeline 1, it obtains the preset value before the turning. At this time, the laser ranging head 17 is driven by the angle adjustment motor to complete the up and down and left and right angle adjustment, and further measures the distance from the laser ranging head 17 to the turning point up, down, left and right, and then determines whether the turning angle is upward, downward, left or right. After turning, the laser ranging head 17 measures the length of the turning section.

[0044] A pair of rotary arms 8, a fixed arm 12 and a connecting arm are fixedly installed on the circumferential side wall of the rotating tube 11. The ends of the pair of rotary arms 8 are embedded with ultrasonic thickness measuring probes 9. A motor 18 electrically connected to the controller 15 is installed in the front movable plate 4. The output end of the motor 18 is fixedly connected to a gear 19. A gear ring meshing with the gear 19 is fixed on the side wall of the rotating tube 11. When the motor 18 is started, the rotating tube 11 is driven to reciprocate 360° forward and backward through the gear 19 and the gear ring. The ultrasonic thickness measuring probe 9 can emit ultrasonic waves to the pipe wall, transmit data wirelessly, and calculate the pipe wall thickness through the ultrasonic thickness gauge.

[0045] The end of the fixed arm 12 is elastically mounted with a magnetic ball 14 that contacts the pipe wall. The magnetic ball 14 magnetically attracts the steel pipe 2. A monitoring component for monitoring the displacement of the magnetic ball 14 is installed in the fixed arm 12. The monitoring component includes a monitoring cavity 37 arranged in the end of the fixed arm 12. A thin abutment plate 39 is arranged in the monitoring cavity 37. Both sides of the thin abutment plate 39 are elastically mounted with a first spring 38. The side wall of the thin abutment plate 39 is fixedly connected with an abutment rod 36 extending from the fixed arm 12. The magnetic ball 14 is fixedly mounted at the end of the abutment rod 36. The inner wall of the monitoring cavity 37 is embedded with a thin abutment plate 39 for monitoring the displacement of the magnetic ball 14. The infrared sensor 40 is electrically connected to the controller 15. The rotating tube 11 synchronously drives the magnetic ball 14 to rotate around the tube wall. The magnetic ball 14 attracts the steel tube 2 under the action of magnetic attraction, and then tightly contacts the tube wall. The magnetic ball 14 can move radially with the ups and downs of the tube wall. The infrared sensor 40 monitors the number of times the thin plate 39 passes, and assists the ultrasonic thickness gauge probe 9 in thickness monitoring to avoid inaccurate ultrasonic thickness measurement when there is small pitting corrosion on the tube wall or shape defects that diverge the sound wave, thereby determining the corrosion position of the tube wall.

[0046] The end of the connecting arm is fixedly connected to the mounting seat 13, and the side walls of the mounting seat 13 are evenly distributed with multiple retractable probes 30. The mounting seat 13 is evenly distributed with multiple telescopic cavities 29. The tail ends of the multiple probes 30 extend into the corresponding telescopic cavities 29 and are elastically connected to the second spring 31. The second spring 31 is electrically connected to the controller 15. A detection component for detecting the telescopic amount of the probe 30 is also installed in the mounting seat 13. The detection component includes a detection cavity 35 evenly distributed in the mounting seat 13. The tail end of the probe 30 is fixedly connected to a pull rod 32 extending into the detection cavity 35. The extended end of the pull rod 32 is fixedly connected to the detection cavity 35. A resistance coil 34 is fixedly connected, and an electric contact 33 in contact with the resistance coil 34 is installed in the detection cavity 35. The electric contact 33 and the resistance coil 34 are both electrically connected to the controller 15. The controller 15 synchronously disconnects the plurality of second springs 31. The second springs 31 reset to eject the evenly distributed plurality of probes 30, which abut against the corroded part of the pipe wall. Since the corrosion surface is uneven, the depth of abutment of the probe 30 is different, and thus the position where the electric contact 33 contacts the resistance coil 34 is different. By using the principle of sliding rheostat to detect different current sizes, the corrosion depth at various parts of the corrosion surface can be obtained.

[0047] The circumferential side walls of the front moving plate 4 and the rear moving plate 3 are installed with multiple rollers 10 that abut against the tube wall. The rear side of the front moving plate 4 is fixedly connected to multiple elastic guide rods 5 that penetrate the rear moving plate 3. The elastic guide rods 5 and the corresponding rollers 10 and the strip telescopic airbags 7 are all on the same straight line in the radial direction. The multiple elastic guide rods 5 can avoid the front moving plate 4 and the rear moving plate 3 from being misaligned during the movement, and adaptively bend when moving in a curve, thereby realizing a guiding effect during straight and curved movement.

[0048] The circumferential side walls of the front moving plate 4 and the rear moving plate 3 are also equipped with a plurality of arc-shaped abutment plates 26 that can be retracted synchronously. The plurality of arc-shaped abutment plates 26 extend out to abut against the tube wall to fix the position of the front moving plate 4 or the rear moving plate 3. The opposite sides of the front moving plate 4 and the rear moving plate 3 are fixedly equipped with oil tanks 23. The front moving plate 4 and the rear moving plate 3 are both equipped with oil pumps 24 connected to the corresponding oil tanks 23. The oil outlet end of the oil pump 24 is connected to a plurality of oil pipes 25. The circumferential side walls of the front moving plate 4 and the rear moving plate 3 are both provided with a plurality of oil chambers 27. The ends of the oil pipes 25 are connected to the corresponding oil chambers 27. A piston 28 is provided in the oil chamber 27, and a side wall of the piston 28 is fixedly connected to a support column extending from the oil chamber 27. The end of the support column is fixedly connected to the corresponding arc-shaped support plate 26. Multiple arc-shaped support plates 26 are staggered with multiple rollers 10. The oil pump 24 is electrically connected to the controller 15. When moving, the oil pump 24 in the rear moving plate 3 is first started through the remote control and the controller 15, and the hydraulic oil in the corresponding oil tank 23 is pumped into the multiple oil chambers 27 through the oil pipe 25. The arc-shaped support plate 26 is driven to extend and contact the pipe wall through the piston 28 and the support column to fix the position of the corresponding moving plate.

[0049] A plurality of telescopic cylinders 16 are fixed to the circumference of the front side of the rear movable plate 3, and a strip-shaped telescopic airbag 7 with independently controllable telescopic amount is installed in each of the plurality of telescopic cylinders 16, and the telescopic end of the strip-shaped telescopic airbag 7 is fixedly connected to the front movable plate 4, and a gas tank 6 is fixedly installed on the rear side of the rear movable plate 3, and an air pump 22 connected to the gas outlet end of the gas tank 6 is installed in the rear movable plate 3, and the gas outlet end of the air pump 22 is connected to a plurality of air pipes 21, and the ends of the plurality of air pipes 21 are all connected to the corresponding strip-shaped telescopic airbags 7, and electromagnetic The valve 20, the solenoid valve 20 and the air pump 22 are all electrically connected to the controller 15. The air pump 22 is started to synchronously pump the gas in the gas tank 6 into the multiple strip-shaped telescopic airbags 7 through the air pipe 21, so that they are inflated and telescoped, thereby pushing the front movable plate 4 to move forward in the pipeline. After the front movable plate 4 moves forward to the limit position, the position of the front movable plate 4 is fixed by the arc-shaped abutment plate 26. The air pump 22 rotates in the opposite direction to draw back the gas in the strip-shaped telescopic airbags 7, thereby pulling the rear movable plate 3 forward, thereby automatically completing the movement process in the pipeline.

[0050] A controller 15 for remotely controlling the arc-shaped abutment plate 26, the extension and retraction of the strip-shaped telescopic airbag 7 and data transmission is installed on the rear movable plate 3. A remote control module and a data transmission module are electrically connected in the controller 15. The remote control module is remotely connected to a remote controller, and the data transmission module is wirelessly connected to a data feedback instrument. The data transmission module is electrically connected to the laser rangefinder 17, the ultrasonic thickness measuring probe 9, the monitoring component and the detection component. A battery is built in the rear movable plate 3. Both remote control and wireless data transmission technologies are prior arts.

[0051] The present invention also provides a method for detecting the wall thickness of a PCCP pipe, comprising the following steps:

[0052] S1. Place the front movable plate 4 and the rear movable plate 3 in the pipe mouth of the PCCP pipe 1, and the multiple rollers 10 are against the pipe wall. When moving, the oil pump 24 in the rear movable plate 3 is first started through the remote control and the controller 15, and the hydraulic oil in the corresponding oil tank 23 is pumped into the multiple oil chambers 27 through the oil pipe 25 respectively, and the arc-shaped abutment plate 26 is driven to extend and abut against the pipe wall through the piston 28 and the abutment column to fix the position of the rear movable plate 3. Then, the air pump 22 is started, and the gas in the gas tank 6 is synchronously pumped into the multiple strip-shaped telescopic airbags 7 through the air pipe 21 to inflate and expand the air, so as to push the front movable plate 4 to move forward in the pipe. After the front movable plate 4 moves forward to the limit position, the position of the front movable plate 4 is fixed by the arc-shaped abutment plate 26, and the air pump 22 rotates in the opposite direction to draw back the gas in the strip-shaped telescopic airbag 7, so as to pull the rear movable plate 3 forward, thereby automatically completing the moving process in the pipe;

[0053] S2, the laser distance measuring head 17 measures the distance to the center of the bend during the straight line movement to obtain the length of the straight line segment. When the movement encounters a bend, the laser distance measuring head 17 detects that the distance reaches a preset value. At this time, after the front moving plate 4 reaches the bend, the opening and closing degree of the corresponding air pipe 21 is controlled by the electromagnetic valve 20, and then the extension and contraction degree of the multiple strip-shaped telescopic airbags 7 is individually controlled. The extension length of the strip-shaped telescopic airbags 7 located on the outside is greater than that of the inside, so that the turning process can be realized;

[0054] S3. During the movement, the motor 18 is started, and the rotating tube 11 is driven to rotate 360° forward and backward through the gear 19 and the gear ring. The ultrasonic thickness measuring probe 9 can send ultrasonic waves to the pipe wall, and the data can be wirelessly transmitted. The pipe wall thickness can be calculated by the ultrasonic thickness gauge. The thickness detection of the entire section of the pipeline can be completed with the movement, and the corrosion of the pipe wall can be analyzed;

[0055] S4, the rotating tube 11 synchronously drives the magnetic ball 14 to rotate around the tube wall. The magnetic ball 14 attracts the steel tube 2 under the action of magnetic attraction, and then closely contacts the tube wall, and can move radially with the ups and downs of the tube wall. The infrared sensor 40 monitors the number of times the thin plate 39 passes, and then assists the ultrasonic thickness measuring probe 9 in thickness monitoring and determines the corrosion position of the tube wall.

[0056] S5. In order to further understand the corrosion of the pipe wall, the mounting seat 13 is rotated to the corrosion position detected in S3 and S4, and the controller 15 disconnects multiple second springs 31 synchronously. The second springs 31 are reset to eject multiple evenly distributed probes 30, which contact the corroded part of the pipe wall. Since the corrosion surface is uneven, the depth of contact of the probe 30 is different, and the position of the electrical contact 33 contacting the resistance coil 34 is different. The principle of sliding rheostat is used to detect different current sizes to obtain the depth of corrosion at various locations on the corrosion surface.

[0057] Working principle: During detection, the front movable plate 4 and the rear movable plate 3 are placed in the pipe mouth of the PCCP pipeline 1, and multiple rollers 10 are against the pipe wall. During movement, the oil pump 24 in the rear movable plate 3 is first started through the remote control and the controller 15, and the hydraulic oil in the corresponding oil tank 23 is pumped into multiple oil chambers 27 through the oil pipe 25 respectively, and the arc-shaped abutment plate 26 is driven to extend and abut against the pipe wall through the piston 28 and the abutment column to fix the position of the rear movable plate 3, and then the air pump 22 is started, and the gas in the gas tank 6 is synchronously pumped into the multiple strip telescopic airbags 7 through the air pipe 21, so that the air is inflated and retracted, and the front movable plate 4 can be pushed forward in the pipeline. After the front movable plate 4 moves forward to the limit position, the position of the front movable plate 4 is fixed by the arc-shaped abutment plate 26, and the air pump 22 rotates in the opposite direction to draw back the gas in the strip telescopic airbag 7, so as to pull the rear movable plate 3 forward, thereby automatically completing the movement process in the pipeline. The laser rangefinder 17 measures the distance to the center of the bend, and the length of the straight line segment can be obtained, and the measurement is accurate.

[0058] Start the motor 18, and drive the rotating tube 11 to rotate 360° forward and backward through the gear 19 and the gear ring. Then, the ultrasonic thickness measuring probe 9 can send ultrasonic waves to the pipe wall, and the data can be transmitted wirelessly. The pipe wall thickness can be calculated by the ultrasonic thickness gauge, and the thickness detection of the entire section of the pipeline can be completed by coordinating the movement.

[0059] When the movement encounters a bend and reaches the preset value before the bend, the angle adjustment motor drives the laser distance measuring head 17 to complete the up and down and left and right angle adjustment at this time, and further measures the distance from the laser distance measuring head to the upper, lower, left and right of the bend, and then determines whether the bend angle is upward, downward, left or right. At this time, the front moving plate 4 reaches the bend, and the opening and closing degree of the corresponding air pipe 21 is controlled by the electromagnetic valve 20, and then the extension degree of the multiple strip telescopic airbags 7 is individually controlled. The telescopic length of the strip telescopic airbag 7 located on the outside is greater than that of the inside (that is, the inflation amount of the outer strip telescopic airbag 7 is greater than that of the inside), and the turning process can be realized. The multiple elastic guide rods 5 can avoid the dislocation of the front moving plate 4 and the rear moving plate 3 during the movement, and can also bend adaptively when moving in a curve, so as to realize the guiding effect during the straight line and curve movement. After the bend, the laser distance measuring head 17 completes the length measurement of the bent section, and the length measurement of each section of the pipeline can be automatically completed.

[0060] The rotating tube 11 synchronously drives the magnetic ball 14 to rotate around the tube wall. The magnetic ball 14 attracts the steel tube 2 under the action of magnetic attraction force, and then tightly contacts the tube wall. The magnetic ball 14 can move radially with the ups and downs of the tube wall. The infrared sensor 40 monitors the number of times the thin plate 39 passes, and assists the ultrasonic thickness gauge probe 9 in thickness monitoring to avoid inaccurate ultrasonic thickness measurement when small pitting corrosion occurs on the tube wall or shape defects that diverge the sound wave, thereby determining the corrosion position of the tube wall.

[0061] When the ultrasonic thickness measuring probe 9 detects a thinner part of the pipe wall, and when the magnetic ball 14 assists in monitoring the uneven thickness position, the corrosion position is determined, and the controller 15 synchronously disconnects the circuits of multiple second springs 31 (when the probe 30 is not in use, the second spring 31 remains energized, so that the evenly distributed probes 30 are always in a contracted state), and the second spring 31 is reset to eject the evenly distributed multiple probes 30, which abut against the corroded part of the pipe wall. Since the corrosion surface is uneven, the depth of the abutment of the probe 30 is different, and then the position where the electrical contact 33 contacts the resistance coil 34 is different. By using the sliding rheostat principle to detect different current sizes, the depth of corrosion at various parts of the corrosion surface can be obtained.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser detection device for a PCCP pipeline, comprising a PCCP pipeline (1), wherein a circle of steel pipe (2) is installed inside the pipe wall of the PCCP pipeline (1), characterized in that: A front movable plate (4) and a rear movable plate (3) are placed in the PCCP pipeline (1); a rotating tube (11) is rotatably connected to the front center of the front side of the front movable plate (4); an angle adjustment seat (41) is installed in the rotating tube (11) at the front side of the front movable plate (4); a laser distance measuring head (17) is installed at the front end of the angle adjustment seat (41); the laser distance measuring head (17) is used to measure the length of each section of the pipeline and the distance between the device and the turning point of the PCCP pipeline (1); and the circumferential direction of the rotating tube (11) is angularly spaced from the rotating tube (11). A pair of rotary arms (8), a fixed arm (12) and a connecting arm are fixedly mounted on the side wall. The ends of the pair of rotary arms (8) are each embedded with an ultrasonic thickness measuring probe (9). The ends of the fixed arms (12) are elastically mounted with a magnetic ball (14) that contacts the pipe wall. The magnetic ball (14) magnetically attracts the steel pipe (2). A monitoring component for monitoring the displacement of the magnetic ball (14) is mounted in the fixed arm (12). The end of the connecting arm is fixedly connected to a mounting seat (13). The side wall of the mounting seat (13) is evenly distributed with a plurality of A retractable probe (30), a detection component for detecting the retractable amount of the probe (30) is also installed in the mounting seat (13), a plurality of rollers (10) that abut against the tube wall are installed on the circumferential side walls of the front movable plate (4) and the rear movable plate (3), a plurality of elastic guide rods (5) that penetrate the rear movable plate (3) are fixedly connected to the rear side of the front movable plate (4), and a plurality of arc-shaped abutment plates (26) that can be retracted synchronously are also installed on the circumferential side walls of the front movable plate (4) and the rear movable plate (3), and the plurality of arc-shaped abutment plates (26) The extension contacts the tube wall and is used to fix the position of the front movable plate (4) or the rear movable plate (3); a plurality of telescopic cylinders (16) are fixed in the circumferential direction of the front side of the rear movable plate (3); a strip-shaped telescopic airbag (7) whose telescopic amount can be independently controlled is installed in each of the plurality of telescopic cylinders (16); the telescopic ends of the strip-shaped telescopic airbag (7) are fixedly connected to the front movable plate (4); and a controller (15) for remotely controlling the telescopic movement of the arc-shaped contact plate (26) and the strip-shaped telescopic airbag (7) and data transmission is installed on the rear movable plate (3); The monitoring assembly comprises a monitoring cavity (37) arranged at the end of the fixed arm (12), a thin abutment plate (39) being arranged in the monitoring cavity (37), first springs (38) being elastically mounted on both sides of the thin abutment plate (39), a side wall of the thin abutment plate (39) being fixedly connected to an abutment rod (36) extending from the fixed arm (12), the magnetic ball (14) being fixedly mounted at the end of the abutment rod (36), an infrared sensor (40) for monitoring the position of the thin abutment plate (39) being embedded in the inner wall of the monitoring cavity (37), and the infrared sensor (40) being electrically connected to the controller (15); A plurality of telescopic cavities (29) are evenly distributed in the mounting seat (13), the tail ends of the plurality of probes (30) extend into the corresponding telescopic cavities (29) and are elastically connected to second springs (31), and the second springs (31) are electrically connected to the controller (15); The detection assembly comprises detection cavities (35) uniformly distributed in the mounting seat (13); the tail end of the probe (30) is fixedly connected to a pull rod (32) extending into the detection cavity (35); the extended end of the pull rod (32) is fixedly connected to a resistance coil (34); an electrical contact (33) in contact with the resistance coil (34) is installed in the detection cavity (35); the electrical contact (33) and the resistance coil (34) are both electrically connected to the controller (15); An air tank (6) is fixedly mounted on the rear side of the rear movable plate (3), an air pump (22) connected to the air outlet of the air tank (6) is mounted inside the rear movable plate (3), the air outlet of the air pump (22) is connected to a plurality of air pipes (21), the ends of the plurality of air pipes (21) are all connected to corresponding strip-shaped telescopic air bags (7), solenoid valves (20) are mounted inside the plurality of air pipes (21), and the solenoid valves (20) and the air pump (22) are both electrically connected to the controller (15).

2. A laser detection device for PCCP pipeline according to claim 1, characterized in that: A motor (18) electrically connected to the controller (15) is installed in the front moving plate (4); a gear (19) is fixedly connected to the output end of the motor (18); and a gear ring meshing with the gear (19) is fixed to the side wall of the rotating tube (11).

3. A laser detection device for PCCP pipeline according to claim 1, characterized in that: An oil tank (23) is fixedly installed on the opposite sides of the front movable plate (4) and the rear movable plate (3), and an oil pump (24) connected to the corresponding oil tank (23) is installed in the front movable plate (4) and the rear movable plate (3). The oil outlet end of the oil pump (24) is connected to a plurality of oil pipes (25). A plurality of oil chambers (27) are provided in the circumferential side walls of the front movable plate (4) and the rear movable plate (3). The ends of the oil pipes (25) are connected to the corresponding oil chambers (27). A piston (28) is provided in the oil chamber (27). A side wall of the piston (28) is fixedly connected to a support column extending out of the oil chamber (27). The end of the support column is fixedly connected to a corresponding arc-shaped support plate (26). The plurality of arc-shaped support plates (26) are staggered with the plurality of rollers (10). The oil pump (24) is electrically connected to the controller (15).

4. A laser detection device for PCCP pipeline according to claim 1, characterized in that: The elastic guide rod (5), the corresponding roller (10) and the strip-shaped telescopic airbag (7) are all located on the same straight line in the radial direction.

5. The laser detection device for PCCP pipeline according to claim 1, characterized in that: The controller (15) is electrically connected to a remote control module and a data transmission module. The remote control module is remotely connected to a remote controller. The data transmission module is wirelessly connected to a data feedback instrument. The data transmission module is electrically connected to a laser rangefinder (17), an ultrasonic thickness measuring probe (9), a monitoring component, and a detection component. A storage battery is built into the rear movable plate (3).

6. A detection method based on a laser detection device for a PCCP pipeline according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. The front movable plate (4) and the rear movable plate (3) are placed in the pipe opening of the PCCP pipe (1), and a plurality of rollers (10) are pressed against the pipe wall. When moving, the oil pump (24) in the rear movable plate (3) is first started through the remote control and the controller (15), and the hydraulic oil in the corresponding oil tank (23) is pumped into the plurality of oil chambers (27) through the oil pipe (25), and the arc-shaped pressing plate (26) is driven to extend and press against the pipe wall through the piston (28) and the pressing column, thereby fixing the position of the rear movable plate (3). The air pump (22) is started to synchronously pump the gas in the gas tank (6) into the plurality of strip-shaped telescopic air bags (7) through the air pipe (21), so that the air is inflated and telescopic, thereby pushing the front movable plate (4) to move forward in the pipeline. After the front movable plate (4) moves forward to the limit position, the position of the front movable plate (4) is fixed by the arc-shaped stop plate (26). The air pump (22) rotates in the opposite direction to draw back the gas in the strip-shaped telescopic air bags (7), thereby pulling the rear movable plate (3) forward, thereby automatically completing the movement process in the pipeline. S2, the laser distance measuring head (17) measures the distance to the center of the bend during the straight line movement to obtain the length of the straight line segment. When the movement encounters a bend, the laser distance measuring head (17) detects that the distance reaches a preset value. At this time, the front moving plate (4) reaches the bend, and the opening and closing degree of the corresponding air pipe (21) is controlled by the electromagnetic valve (20), thereby individually controlling the extension and contraction degree of the plurality of strip-shaped telescopic airbags (7). The extension length of the strip-shaped telescopic airbags (7) located on the outside is greater than that of the inside, so that the turning process can be realized. After the turning, the laser distance measuring head (17) measures the length of the turning segment; S3, during the movement, the motor (18) is started, and the rotating tube (11) is driven to rotate 360° forward and backward through the gear (19) and the gear ring, so that the ultrasonic thickness measuring probe (9) can emit ultrasonic waves to the pipe wall, and the data can be wirelessly transmitted. The pipe wall thickness can be calculated by the ultrasonic thickness gauge, and the thickness of the entire pipe section can be detected by the movement, and the corrosion of the pipe wall can be analyzed; S4, the rotating tube (11) synchronously drives the magnetic ball (14) to rotate around the tube wall. The magnetic ball (14) attracts the steel tube (2) under the action of magnetic attraction, and then closely contacts the tube wall, and can move radially with the fluctuation of the tube wall. The infrared sensor (40) monitors the number of times the thin contact plate (39) passes, and then assists the ultrasonic thickness measuring probe (9) in thickness monitoring, and determines the corrosion position of the tube wall. S5. In order to further understand the corrosion of the pipe wall, the mounting seat (13) is rotated to the corrosion position detected in S3 and S4, and the controller (15) synchronously disconnects the plurality of second springs (31). The second springs (31) are reset to eject the evenly distributed plurality of probes (30) and abut against the corrosion of the pipe wall. Since the corrosion surface is uneven, the depth of abutment of the probes (30) is different, and thus the position of the electrical contact (33) contacting the resistance coil (34) is different. By using the sliding rheostat principle to detect different current sizes, the depth of corrosion at various locations on the corrosion surface can be obtained.

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