A mobile pipeline internal detection device and detection method

Abstract

The present invention discloses a mobile internal pipeline detection device, specifically relating to the technical field of pipeline detection, including a detection seat, walking rollers, an installation cylinder, a detection rod, a support plate, and a paper winding shaft. A marking paper is wound around the two paper winding shafts together; a telescopic marking component connected to the detection rod, and the telescopic marking component is used in cooperation with the marking paper. By providing the marking paper, the telescopic marking component, and the detection rod, when the end of the detection rod abuts against a position with a relatively thin inner wall thickness of the pipeline, the detection rod will move away from the detection seat, thereby enabling the telescopic marking component to contact the marking paper, and thus being able to leave a painted mark on the marking paper, so as to be able to detect the inner wall thickness of the pipeline more intuitively and reduce the error caused by manual visual inspection.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline detection. More specifically, the present invention relates to a mobile pipeline internal detection device and a detection method. Background Art

[0002] A pressure pipeline refers to all pipelines that bear internal pressure or external pressure, regardless of the medium inside the pipe. A pressure pipeline is a part of a pipeline, and a pipeline is an assembly composed of pipes, pipe fittings, flanges, bolt connections, gaskets, valves, other components or pressure-bearing components, and supports for transporting, distributing, mixing, separating, discharging, metering, controlling, and stopping the flow of fluids.

[0003] The wall thickness of a pipeline determines its pressure-bearing capacity. Therefore, after the pipeline is processed, it is necessary to ensure that its thickness is basically the same to ensure the pressure-bearing capacity of the pipeline. When detecting the thickness, a pipeline thickness detection device is usually used. For example, a mobile non-destructive inspection device for pressure pipelines disclosed in Chinese Patent Publication No. CN115096895A includes a moving disk and a fixed disk. A cable is fixedly connected to the right side of the surface of the moving disk, and a disk groove communicating with the outside of its left side is opened inside the moving disk. A spring wire reel is rotatably connected inside the disk groove, and a steel cable is wound on the spring wire reel. The movable end of the steel cable is arranged on the fixed disk.

[0004] The above-mentioned pipeline thickness detection device in the prior art emits an aperture through a laser head, and then the staff analyzes the thickness of the pipeline according to the real-time change of the aperture. This method requires the staff to always stare at the change of the aperture and rely on manual visual inspection, which is prone to omission and cause detection errors. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a mobile pipeline internal detection device and a detection method. The technical problem to be solved by the present invention is that the detection device in the prior art requires the staff to always stare at the change of the aperture for detection, which is prone to omission and then cause detection errors.

[0006] To achieve the above object, the present invention provides the following technical solution: A mobile pipeline internal detection device includes:

[0007] A detection seat with multiple hinge rods hinged on its periphery, and a walking roller is rotatably connected to the end of the hinge rod far from the detection seat;

[0008] An installation cylinder fixed to the detection seat, and a detection rod is inserted through the installation cylinder;

[0009] A support plate fixedly connected to the detection base, and a paper winding shaft is rotatably connected to each of the two ends of the support plate corresponding to the walking direction of the detection base, and a marking paper is wound around the two paper winding shafts together;

[0010] A telescopic marking component connected to the detection rod, and the telescopic marking component is used in cooperation with the marking paper.

[0011] Preferably, a first belt pulley is coaxially connected to one of the paper winding shafts corresponding to the front end of the walking direction of the detection base, a second belt pulley is coaxially connected to one of the walking rollers, and a V-belt is sleeved between the first belt pulley and the second belt pulley.

[0012] Preferably, the upper end of the detection rod passes through the mounting cylinder and is rotatably connected with a detection roller.

[0013] Preferably, the telescopic marking component includes:

[0014] A first swing arm hinged to the upper end of the mounting cylinder, and the lower end of the first swing arm extends towards the marking paper;

[0015] A first marking column fixedly connected to the lower end of the first swing arm, and a first installation cavity is formed in the first marking column;

[0016] A second marking column coaxially and slidably penetrating through the lower end of the first marking column, a first clamping block is arranged at the upper end of the second marking column, the first clamping block is clamped in the first installation cavity and can slide freely, and a second installation cavity is formed in the second marking column;

[0017] A first spring installed in the first installation cavity, and the first spring elastically abuts against the first clamping block;

[0018] A third marking column coaxially and slidably penetrating through the lower end of the second marking column, a coloring layer is adhered to the lower end surfaces of the third marking column, the second marking column and the first marking column, a second clamping block is fixedly connected to the upper end of the third marking column, the second clamping block is clamped in the second installation cavity and can slide freely, and the outer diameters of the first marking column, the second marking column and the third marking column decrease in sequence;

[0019] A second spring installed in the second installation cavity, and the second spring elastically abuts against the second clamping block;

[0020] A swing part used for driving the first swing arm to swing when the detection rod moves up and down.

[0021] Preferably, the swinging member includes a second swing arm integrally formed and connected to the upper end of the first swing arm. An avoidance groove for the free passage of the detection rod is formed on the second swing arm. A first sliding pin is provided on the detection rod, and a first waist-shaped hole for inserting the first sliding pin is formed on the second swing arm.

[0022] Preferably, the detection rod is driven by an elastic abutting member to move away from the detection seat. The elastic abutting member includes:

[0023] A sliding block fixedly connected to the lower end of the detection rod. The sliding block is engaged in the installation cylinder and can slide up and down freely;

[0024] A return spring installed in the installation cylinder. The return spring elastically abuts the sliding block.

[0025] Preferably, a second sliding pin is inserted through the sliding block, and a second waist-shaped hole for inserting the second sliding pin is formed on the installation cylinder.

[0026] A detection method for a mobile pipeline internal detection device includes:

[0027] Place the detection seat at one end inside the pipeline to be detected, and then swing it outward from the detection seat through the hinge rod, so that multiple groups of the traveling rollers abut against the inner wall of the pipeline, and make the detection seat coaxial with the pipeline. Then use an external pulling rope to pull the detection seat towards the other end of the pipeline to be detected, so that the detection seat can move in the pipeline through the rolling of the traveling rollers. When the detection seat travels in the pipeline, through the elastic abutment of the return spring on the sliding block, the detection roller moves upward and rolls in contact with the inner wall of the pipeline. When the traveling roller rolls on the inner wall of the pipeline, it will drive the second belt pulley to rotate. The second belt pulley can drive the first belt pulley to rotate through a triangular belt, so that the rotation of the traveling roller drives the paper roll shaft to rotate, so that the marking paper can be unrolled, and the unrolling speed matches the moving speed of the traveling roller;

[0028] When the detection roller rolls to a position where the pipeline thickness is relatively thin, the detection roller will move away from the installation cylinder, thereby driving the first sliding pin to slide in the first waist-shaped hole, and driving the second swing arm to swing upward, thereby driving the first swing arm to swing downward, so that the third marking column first contacts the surface of the marking paper. And as the pipeline thickness changes, the third marking column, the second marking column and the first marking column correspondingly contact the surface of the marking paper, so that the coloring layer can leave a coloring mark on the marking paper. And as the pipeline thickness decreases, the third marking column, the second marking column and the first marking column correspondingly contact the marking paper. Scale lines are printed on the marking paper, and the values on the scale lines correspond to the length of the marking paper after being unrolled and stretched;

[0029] After the detection is completed, remove the marking paper from the two paper rollers, then stretch the marking paper and fix both ends of the marking paper to both ends of the pipeline respectively. In this way, according to the width and position of the coloring marks on the marking paper, the position where the pipeline thickness is relatively thin can be initially determined. That is, the wider the coloring mark, the smaller the pipeline thickness at that place. The numerical value of the scale line on the marking paper corresponding to the position of the coloring mark on the marking paper corresponds to the length dimension of the pipeline.

[0030] Technical effects and advantages of the present invention:

[0031] By setting the marking paper, the telescopic marking component and the detection rod, when the end of the detection rod abuts against the position where the inner wall thickness of the pipeline is relatively thin, the detection rod will move away from the detection seat, thereby enabling the telescopic marking component to contact the marking paper, and then being able to leave a coloring mark on the marking paper, so that the inner wall thickness of the pipeline can be detected more intuitively, reducing the error caused by manual visual inspection;

[0032] By setting the paper roller, the paper roller is in transmission connection with the traveling roller. Then, when the traveling roller rotates, the paper roller rotates synchronously, so that the marking paper can be continuously unrolled, and the unrolled length is consistent with the traveling stroke of the traveling roller. In this way, the numerical value of the scale line corresponding to the position of the coloring mark on the marking paper can intuitively reflect the thickness of the pipeline at the part corresponding to the numerical value of the scale line length of the pipeline;

[0033] By setting the first marking post, the second marking post and the third marking post, as the upward movement stroke of the detection rod increases, the third marking post, the second marking post and the first marking post can contact the marking paper according to the upward movement stroke of the detection rod, and then the degree of pipeline thickness out-of-tolerance can be detected by changing the width of the coloring mark. Description of the drawings

[0034] Figure 1 It is a schematic structural diagram of a mobile pipeline internal detection device of the present invention;

[0035] Figure 2 is Figure 1 a front view angle schematic diagram of the structure in

[0036] Figure 3 is Figure 1 a side view angle schematic diagram of the structure in

[0037] Figure 4 is Figure 2 a schematic diagram of the structure after omitting the detection seat in

[0038] Figure 5 It is a schematic diagram of the assembled structure of the first swing arm, the second swing arm and the first marking post in the present invention;

[0039] Figure 6 is Figure 5 a schematic cross-sectional view of the structure in

[0040] Figure 7 is Figure 5 a schematic view of the structure in from the bottom view angle;

[0041] Figure 8 is Figure 4 an enlarged schematic view of the partial structure at A in

[0042] The reference numerals in the drawings are: 1 - detection base, 2 - hinge rod, 3 - traveling roller, 4 - cross bar, 5 - swing rod, 6 - through slot, 7 - paper roll shaft, 8 - support plate, 9 - marking paper, 10 - first marking post, 11 - first swing arm, 12 - detection roller, 13 - second swing arm, 14 - mounting cylinder, 15 - second sliding pin, 16 - return spring, 17 - cylinder, 18 - sliding block, 19 - detection rod, 20 - hinge seat, 21 - pull rod, 22 - second marking post, 23 - third marking post, 24 - first kidney-shaped hole, 25 - first spring, 26 - first clamping block, 27 - second spring, 28 - second clamping block, 29 - first mounting cavity, 30 - coating layer; 31 - second kidney-shaped hole; 32 - first sliding pin. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] As Figures 1 - 8 shown, the present invention provides: a mobile pipeline internal detection device, including:

[0045] The detection seat 1 is peripherally hinged with multiple groups of hinge rods 2. The outer contour of the detection seat 1 is cylindrical. There are a total of three groups of hinge rods 2, with two in each group, and they are arrayed along the axial direction of the detection seat 1 and hinged on the periphery of the detection seat 1. In addition, the end of the hinge rod 2 far from the detection seat 1 is rotatably connected with a walking roller 3 through a mounting pivot. One end of the detection seat 1 facing the opposite direction of its walking direction in the pipeline is horizontally installed with a cylinder 17. The cylinder rod of the cylinder 17 slides through the end face of the detection seat 1, and the end penetrating into the detection seat 1 is coaxially welded with a pull rod 21. A hinge seat 20 is sleeved on the pull rod 21. Three swing rods 5 are arrayed along the axial direction of the hinge seat 20 and hinged to it. A cross bar 4 is jointly hinged between two hinge rods 2 in each group. The two ends of the cross bar 4 are respectively hinged with the two hinge rods 2, and one end of the swing rod 5 passes through the detection seat 1 and is hinged with the cross bar 4. In this way, by the telescopic movement of the cylinder rod of the cylinder 17, the hinge seat 20 can be driven to move. When the hinge seat 20 moves, it can drive the swing rod 5 to pull the cross bar 4 to move, so that the hinge rod 2 can rotate along the hinge joint with the detection seat 1, and then the three walking rollers 3 can swing towards the outside of the detection seat 1 and the walking rollers 3 can be pressed against the inner wall of the pipeline, so as to support and install the detection seat 1 in the pipeline and make the detection seat 1 coaxial with the pipeline;

[0046] The mounting cylinder 14 fixed to the detection seat 1. A detection rod 19 is passed through the mounting cylinder 14. The detection rod 19 can move along the axial direction of the mounting cylinder 14 or along the radial direction of the detection seat 1 on the mounting cylinder 14. The mounting cylinder 14 can be vertically welded to the detection seat 1. When the detection seat 1 walks in the pipeline, the end of the detection rod 19 passing through the mounting cylinder 14 will be in contact with the inner wall of the pipeline and move with the change of the thickness of the inner wall of the pipeline. Specifically, when the thickness of the inner wall of the pipeline becomes thinner, the detection rod 19 will move towards the outside of the mounting cylinder 14 or away from the detection seat 1. In addition, further, as Figure 8 shown, the detection rod 19 is driven by an elastic abutting member to move away from the detection seat 1. The elastic abutting member includes:

[0047] A sliding block 18 fixed to the lower end of the detection rod 19. The sliding block 18 is engaged in the mounting cylinder 14 and can slide up and down freely;

[0048] A return spring 16 installed in the mounting cylinder 14. The return spring 16 elastically abuts against the sliding block 18. An elastic abutting force towards the outside of the detection seat 1 is generated on the sliding block 18 by the return spring 16, so that the sliding block 18 can drive the detection rod 19 to move and keep the end of the detection rod 19 in contact with the inner wall of the pipeline. In addition, as Figure 1As shown in the figure, the upper end of the detection rod 19 passes through the mounting cylinder 14 and is rotatably connected with a detection roller 12. A detection roller 12 is installed at the upper end of the detection rod 19. The axial direction of the detection roller 12 is perpendicular to the traveling direction of the detection seat 1 in the pipeline. In this way, when the detection seat 1 travels and moves, the detection roller 12 can remain in contact with the inner wall of the pipeline. Furthermore, when the detection seat 1 travels in the pipeline, it can drive the detection roller 12 to rotate synchronously. In this way, the detection rod 19, which was originally in frictional contact with the inner wall of the pipeline, can be converted into rolling contact, reducing the wear of the detection rod 19;

[0049] In addition, a support plate 8 is welded on the detection seat 1. At both ends of the support plate 8 corresponding to the traveling direction of the detection seat 1, a paper winding shaft 7 is rotatably connected. The paper winding shaft 7 can rotate freely on the support plate 8. A marking paper 9 is wound around the two paper winding shafts 7 together. One paper winding shaft 7 adjacent to the cylinder 17 can be defined as a paper unwinding type paper winding shaft 7, and the other paper winding shaft 7 can be defined as a paper winding type paper winding shaft 7. Furthermore, as Figure 1 、 2 shown in the figure, a first belt pulley is coaxially connected to a paper winding shaft 7 (i.e., the paper winding type paper winding shaft 7) at the front end of the detection seat 1 corresponding to the traveling direction. A second belt pulley is coaxially connected to one of the traveling rollers 3. A V-belt is sleeved between the first belt pulley and the second belt pulley. The first belt pulley and the second belt pulley are connected by belt drive. In this way, when the traveling roller 3 rotates, it synchronously drives the paper winding type paper winding shaft 7 to rotate, and then can wind up the marking paper 9 wound on the paper unwinding type paper winding shaft. In this embodiment, the marking paper 9 is a white paper with a certain hardness. The marking paper 9 is wound on the paper unwinding type paper winding shaft 7, and the unwound end is adhered to the paper winding type paper winding shaft 7. In addition, a scale line is printed on the upward-facing side of the marking paper 9, and corresponding numerical values are printed on the scale line. The minimum value of the numerical value is defined as Dmin, and the maximum value of the numerical value is defined as Dmax. The value of Dmin is the distance dimension between the position where the detection roller 12 contacts the inner wall of the pipeline and the pipe opening when the detection roller 12 is placed in the pipeline. For example, when the detection seat 1 is placed and supported in the pipeline during detection, at this time, the detection roller 12 moves outward toward the outside of the detection seat 1 under the elastic abutting force of the return spring 16 on the sliding block 18 and contacts the inner wall of the pipeline. The contact position is the detection initial position of the detection roller 12. The minimum distance dimension between the detection initial position and the pipe opening is Dmin. Dmax is the detection end position of the detection roller 12 when the detection is completed. The numerical value of the distance dimension between the position where it contacts the inner wall of the pipeline and the pipe opening is Dmax;

[0050] A telescopic marking component is connected to the detection rod 19. The telescopic marking component is used in cooperation with the marking paper 9. The telescopic marking component can form a coloring layer on the surface of the marking paper 9.

[0051] In summary, first, place the detection seat 1 into the pipeline to be measured, then start the cylinder 17. The cylinder rod of the cylinder 17 extends, thereby driving the hinge seat 20 to move away from the cylinder 17, causing the swing rod 6 to drive the cross bar 4 to swing. As a result, the hinge rod 2 swings along the hinge with the detection seat 1 towards the radially outer direction of the detection seat 1, enabling the walking roller 3 to contact the inner wall of the pipeline. Finally, the detection seat 1 is supported and installed in the pipeline, and at this time, the detection seat 1 is coaxial with the pipeline. The return spring 16 has an upward elastic abutting force on the sliding block 18, causing the sliding block 18 to drive the detection rod 19 to move upward above the detection seat 1, and keeping the detection roller 12 at the upper end of the detection rod 19 in contact with the inner wall of the pipeline. A pull rope is bolted to one end of the detection seat 1 away from the cylinder 17, or a winch can be used in combination with the pull rope on the winch to pull the detection seat 1 to move in the pipeline, enabling the detection seat 1 to move slowly in the pipeline. During the movement, the walking roller 3 is in a rotating state. In this way, through the belt drive of the first pulley and the second pulley, the winding type paper roll shaft 7 is driven to rotate, pulling the marking paper 9, causing another paper roll shaft 7 to rotate and starting to unwind the marking paper 9. When the detection roller 12 rolls to a position where the pipeline thickness is relatively thin, at this time, the return spring 16 will drive the sliding block 18 to move outward of the detection seat 1 again, making the length of the detection rod 19 extending out of the installation cylinder 14 relatively longer, thereby triggering the telescopic marking component to act, making the telescopic marking component contact the side of the marking paper 9 printed with scale lines and numerical values, and being able to leave a painted mark on the marking paper 9. After the detection is completed, remove the marking paper 9, then stretch the marking paper 9, and then observe the numerical value corresponding to the position of the painted mark. Then, using the aforementioned detection initial device as the calibration point, place an external tape measure on the pipeline, fix the zero position of the tape measure at the calibration point, stretch the tape measure to the position corresponding to the numerical value of the painted mark, and then make a mark on the outer wall of the pipeline at this position for convenient re-measurement or repair later. In this way, a detection process is completed.

[0052] As Figure 6 , 7 shown, the telescopic marking component includes:

[0053] A first swing arm 11 hinged to the upper end of the installation cylinder 14, with the lower end of the first swing arm 11 extending towards the marking paper 9;

[0054] A first marking post 10 fixedly connected to the lower end of the first swing arm 11, with a first installation cavity 29 opened in the first marking post 10;

[0055] A second marking post 22 coaxially and slidably passing through the lower end of the first marking post 10, with a first clamping block 26 provided at the upper end of the second marking post 22. The first clamping block 26 is clamped in the first installation cavity 29 and can slide freely, and a second installation cavity is opened in the second marking post 22;

[0056] The first spring 25 installed in the first installation cavity 29 elastically abuts against the first latch 26, thereby causing the first latch 26 to drive the second marking post 22 to move downward toward the lower side of the first marking post 10, so that the second marking post 22 can expose the first marking post 10;

[0057] The third marking post 23 coaxially and slidably penetrates through the lower end of the second marking post 22. Coating layers 30 are adhered to the lower end surfaces of the third marking post 23, the second marking post 22, and the first marking post 10. The upper end of the third marking post 23 is fixedly connected with a second latch 28. The second latch 28 is engaged in the second installation cavity and can slide freely. The outer diameters of the first marking post 10, the second marking post 22, and the third marking post 23 decrease in sequence;

[0058] The second spring 27 installed in the second installation cavity elastically abuts against the second latch 28. Similarly, the second spring 27 generates a downward elastic abutting force on the second latch 28, so that the third marking post 23 exposes the second marking post 22;

[0059] A swinging member that can drive the first swing arm 11 to swing when the detection rod 19 moves up and down.

[0060] When the detection roller 12 contacts a position with a relatively thin pipe thickness, the detection roller 12 will drive the detection rod 19 to move outward in the direction of the outside of the detection seat 1, and then drive the first swing arm 11 to swing downward through the swing member, so that the third marking column 23 first contacts the surface of the marking paper 9. When the detection rod 19 moves upward with a large stroke, after the third marking column 23 contacts the marking paper 9, the detection rod 19 continues to move upward. At this time, the third marking column 23 will gradually retract into the second marking column 22, and the second marking column 22 will gradually contact the surface of the marking paper 9. In this way, the coating layers 30 on the lower end surfaces of the second marking column 22 and the third marking column 23 both contact the surface of the marking paper 9. Of course, as the upward movement stroke of the detection rod 19 increases, the second marking column 23 will also retract into the first marking column 10, so that the coating layers on the lower end surfaces of the first marking column 10, the second marking column 22, and the third marking column 23 all contact the surface of the marking paper 9. And as the third marking column 23, the second marking column 22, and the first marking column 10 respectively contact the marking paper 9, the width of the coating marks left by the coating layer 30 on the marking paper 9 also increases. In this way, by observing the change in the width of the coating marks, the degree of thinning of the pipe thickness at the corresponding position can be analyzed. Specifically, as the third marking column 23, the second marking column 22, and the first marking column 10 contact the marking paper 9, the increase in the width of the coating marks indicates that the pipe thickness is getting thinner and thinner. The first spring 25 and the second spring 27 always maintain an elastic abutting state with the first fixture block 26 and the second fixture block 28. In addition, a support plate welded to the detection seat 1 can be arranged between the two paper winding shafts 8, and the upper surface of the support plate contacts the other side of the marking paper 9 and corresponds to the first marking column 10. In this way, when the first marking column 10, the second marking column 22, and the third marking column 23 contact the marking paper 9, the support plate can support the marking paper 9 to prevent the marking paper 9 from being punctured by the first marking column 10, the second marking column 22, and the third marking column 23. The coating layer in this embodiment can be a lead core graphite mixed material for making pencil cores. The lead core graphite mixed material raw material is made into a round piece and bonded to the lower end surfaces of the first marking column 10, the second marking column 22, and the third marking column 23, so that black coating marks can be left on the surface of the marking paper 9.

[0061] As Figure 1 , 2As shown in the figure, the swinging member includes a second swing arm 13 integrally formed and connected to the upper end of the first swing arm 11. An avoidance groove for the free passage of the detection rod 19 is provided on the second swing arm 13. A first sliding pin 32 is provided on the detection rod 19, and a first waist-shaped hole 24 for inserting the first sliding pin 32 is provided on the second swing arm 13. When the detection rod 19 moves upward, it will drive the first sliding pin 32 to slide in the first waist-shaped hole 24, and then be able to drive the first swing arm 11 to swing downward. In addition, the length of the first swing arm 11 is much greater than the length of the second swing arm 13. Thus, based on the lever principle, the moving stroke of the detection rod 19 can be amplified, so that the moving strokes of the first marking column 10, the second marking column 22, and the third marking column 23 are larger, and better coloring identification can be performed. Of course, the length dimensions of the first swing arm 11 and the second swing arm 13 can be obtained by those skilled in the art through a limited number of experiments, and will not be elaborated here.

[0062] As Figure 8 As shown in the figure, a second sliding pin 15 is inserted through the sliding block 18, and a second waist-shaped hole 31 for inserting the second sliding pin 15 is provided on the mounting cylinder 14. By sliding the second sliding pin 15 in the second waist-shaped hole 31, the movement of the sliding block 18 can be limited to prevent the detection rod 19 from disengaging from the mounting cylinder 14.

[0063] The working principle of the present invention includes:

[0064] Place one end of the detection seat 1 into the pipeline to be measured, and then swing the hinge rod 2 in the outer direction of the detection seat 1, so that multiple groups of traveling rollers 3 abut against the inner wall of the pipeline, and make the detection seat 1 coaxial with the pipeline. Then use an external pull rope to pull the detection seat 1 towards the other end of the pipeline to be measured, so that the detection seat 1 can move in the pipeline by rolling the traveling rollers 3. When the detection seat 1 travels in the pipeline, through the elastic abutment of the return spring 16 on the sliding block 18, the detection roller 12 moves upward and rolls in contact with the inner wall of the pipeline. When the traveling rollers 3 roll on the inner wall of the pipeline, they will drive the second belt pulley to rotate. The second belt pulley can drive the first belt pulley to rotate through a triangular belt, so that the traveling rollers 3 rotate to drive the paper roll shaft 7 to rotate, so that the marking paper 9 can be unrolled, and the unrolling speed matches the moving speed of the traveling rollers 3;

[0065] When the detection roller 12 rolls to a position where the pipe thickness is relatively thin, the detection roller 12 will move away from the mounting cylinder 14, thereby driving the first sliding pin 32 to slide within the first waist-shaped hole 24, and driving the second swing arm 13 to swing upward, thereby driving the first swing arm 11 to swing downward, such that the third marking post 23 first contacts the surface of the marking paper 9. And as the pipe thickness changes, the third marking post 23, the second marking post 22, and the first marking post 10 correspondingly contact the surface of the marking paper 9, thereby enabling the coating layer 30 to leave a coating mark on the marking paper 9. And as the pipe thickness decreases, the third marking post 23, the second marking post 22, and the first marking post 10 correspondingly contact the marking paper 9. The marking paper 9 is printed with scale lines, and the values on the scale lines correspond to the length of the marking paper 9 after being unrolled and stretched;

[0066] After the detection is completed, take the marking paper 9 off the two paper reels 7, then stretch the marking paper 9 and fix the two ends of the marking paper 9 to both ends of the pipe respectively. In this way, according to the width and position of the coating marks on the marking paper 9, the position where the pipe thickness is relatively thin can be preliminarily determined. That is, the wider the coating mark, the smaller the pipe thickness at that place. The scale line value on the marking paper 9 corresponding to the position of the coating mark on the marking paper 9, and this scale line value corresponds to the length dimension of the pipe.

[0067] Finally, several points should be noted: First, in the description of the present application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense, which can be a mechanical connection or an electrical connection, or the communication inside two components, and can be directly connected. "Up", "down", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change;

[0068] Second: In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0069] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mobile pipeline internal detection device, characterized in that: include: A detection seat (1) is hinged at its periphery with a plurality of sets of hinge rods (2), and one end of the hinge rod (2) away from the detection seat (1) is rotatably connected to a walking roller (3); A mounting tube (14) fixedly connected to the detection seat (1), wherein a detection rod (19) is passed through the mounting tube (14); A support plate (8) fixedly connected to the detection seat (1), the two ends of the support plate (8) corresponding to the travel direction of the detection seat (1) are rotatably connected to a paper reel (7), and the two paper reels (7) are jointly wound with marking paper (9); A first pulley is coaxially connected to a paper reel (7) at the front end of the detection seat (1) in the walking direction, a second pulley is coaxially connected to one of the walking rollers (3), a V-belt is sleeved between the first pulley and the second pulley, and the upper end of the detection rod (19) passes through the mounting tube (14) and is rotatably connected to the detection roller (12); A telescopic marking component connected to the detection rod (19), the telescopic marking component being used in conjunction with the marking paper (9), the telescopic marking component comprising: A first swing arm (11) is hinged to the upper end of the mounting tube (14), and the lower end of the first swing arm (11) extends toward the marking paper (9); A first marking column (10) fixedly connected to the lower end of the first swing arm (11), wherein a first mounting cavity (29) is provided in the first marking column (10); a second marking column (22) coaxially slidably penetrated through the lower end of the first marking column (10), a first clamping block (26) being provided at the upper end of the second marking column (22), the first clamping block (26) being engaged in the first mounting cavity (29) and being able to slide freely, and a second mounting cavity being provided in the second marking column (22); a first spring (25) installed in the first installation cavity (29), the first spring (25) elastically pressing against the first clamping block (26); A third marking column (23) is coaxially slidably inserted into the lower end of the second marking column (22); the lower end surfaces of the third marking column (23), the second marking column (22) and the first marking column (10) are respectively bonded with a coating layer (30); the upper end of the third marking column (23) is fixedly connected with a second clamping block (28); the second clamping block (28) is engaged in the second mounting cavity and can slide freely; the outer diameters of the first marking column (10), the second marking column (22) and the third marking column (23) decrease in sequence; a second spring (27) installed in the second installation cavity, the second spring (27) elastically pressing against the second clamping block (28); A swinging member capable of driving the first swing arm (11) to swing when the detection rod (19) moves up and down; The swing member comprises a second swing arm (13) integrally formed and connected to the upper end of the first swing arm (11); the second swing arm (13) is provided with a clearance groove for the detection rod (19) to freely pass through; the detection rod (19) is provided with a first sliding pin (32); and the second swing arm (13) is provided with a first waist-shaped hole (24) for the first sliding pin (32) to be inserted into; The detection rod (19) is driven by an elastic abutting component to move in a direction away from the detection seat (1), and the elastic abutting component comprises: A sliding block (18) fixedly connected to the lower end of the detection rod (19), the sliding block (18) being engaged in the mounting tube (14) and being able to slide freely up and down; A return spring (16) is installed in the installation tube (14), and the return spring (16) elastically presses against the sliding block (18).

2. The mobile pipeline internal detection device according to claim 1, characterized in that: The sliding block (18) is provided with a second sliding pin (15), and the mounting tube (14) is provided with a second waist-shaped hole (31) for the second sliding pin (15) to be inserted.

3. The detection method of a mobile pipeline internal detection device according to claim 2, characterized in that: include: The detection seat (1) is placed into one end of the pipeline to be tested, and then the hinge rod (2) is used to swing toward the outer side of the detection seat (1), so that the multiple groups of the walking rollers (3) are against the inner wall of the pipeline, and the detection seat (1) and the pipeline are in a coaxial state. Then, the detection seat (1) is pulled toward the other end of the pipeline to be tested by using an external pull rope, so that the detection seat (1) can move in the pipeline through the rolling of the walking rollers (3). When the detection seat (1) moves in the pipeline, the return spring (16) elastically presses against the sliding block (18), so that the detection roller (12) moves upward and rolls with the inner wall of the pipeline. When the walking roller (3) rolls on the inner wall of the pipeline, it drives the second pulley to rotate. The second pulley can drive the first pulley to rotate through the V-belt, so that the rotation of the walking roller (3) drives the paper reel (7) to rotate, so that the marking paper (9) can be unwound, and the unwinding speed matches the moving speed of the walking roller (3); When the detection roller (12) rolls to a position where the thickness of the pipeline is relatively thin, the detection roller (12) will move in a direction away from the installation tube (14), thereby driving the first sliding pin (32) to slide in the first waist-shaped hole (24), and driving the second swing arm (13) to swing upward, thereby driving the first swing arm (11) to swing downward, so that the third marking column (23) first contacts the surface of the marking paper (9), and as the thickness of the pipeline changes, the third marking column (23), the second marking column (22) and the first marking column (10) contact the surface of the marking paper (9) correspondingly, thereby enabling the coloring layer (30) to leave a coloring mark on the marking paper (9), and as the thickness of the pipeline decreases, the third marking column (23), the second marking column (22) and the first marking column (10) contact the marking paper (9) correspondingly, and the marking paper (9) is printed with scale lines, and the values ​​on the scale lines correspond to the length of the marking paper (9) after unwinding and stretching; After the detection is completed, the marking paper (9) is taken off the two paper reels (7), and then the marking paper (9) is stretched and the two ends of the marking paper (9) are respectively fixed to the two ends of the pipeline. In this way, according to the width and position of the color mark on the marking paper (9), the position of the pipeline with thinner thickness can be preliminarily determined, that is, the larger the width of the color mark, the smaller the thickness of the pipeline at that location. The position of the color mark on the marking paper (9) corresponds to the scale line value on the marking paper (9), and the scale line value corresponds to the length dimension of the pipeline.

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