Pipeline inner wall defect detection head and detection device

Abstract

The present invention discloses a pipeline inner wall defect detection head and detection device, belonging to the field of pipeline detection technology. The detection head includes a plurality of foldable arms arranged and distributed circumferentially to form a shuttle-shaped detection head frame. One end of the detection head frame is hingedly connected to a first connecting seat, and the other end is hingedly connected to a second connecting seat. When the diameter of the detection head frame changes, the spacing between the first and second connecting seats changes accordingly. The detection head frame is also equipped with a reset structure for returning the detection head frame to its initial diameter. A photoelectric sensor module is installed inside the detection head frame, and the photoelectric sensor module is configured to send an electrical signal when the spacing between the first and second connecting seats changes. A transmission mechanism is also installed at one end of the detection head frame, which is connected to a drive device through the transmission mechanism to drive the detection head frame to rotate and advance. By configuring the detection head frame as a scalable structure, the present invention can pass through pipeline defect areas and avoid getting stuck.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline detection, and in particular to a pipeline inner wall defect detection head and a detection device. Background Art

[0002] Pipelines are widely used, mainly in water supply, drainage, heating, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering and various industrial installations. However, if there are defects in the inner wall of the pipeline, it will also cause troubles in construction operations. For example, blockage or depression of the inner wall of the pipeline may hinder transportation or other operations. Therefore, it is particularly important to detect defects on the inner wall of the pipeline.

[0003] Traditional detection methods include contact and non-contact. Contact detection involves a detector or sensor in direct contact with the object being measured, obtaining relevant information by measuring physical quantities (such as pressure, displacement, and deformation) during the contact process. Non-contact detection involves a detector or sensor that doesn't require direct contact with the object being measured. Instead, it utilizes physical phenomena such as light, electricity, and magnetism to obtain relevant information by measuring their manifestation on the object.

[0004] Since the non-contact detection method uses more sensors, the cost is high, and the uneven material of the inner wall of the pipeline will also affect the results of non-contact detection. Therefore, the existing pipeline inner wall defect detection mostly adopts the contact detection method. However, since the detection head of the contact detection needs to be in direct contact with the inner wall of the pipeline, when there is a depression on the inner wall of the pipeline, it is easy to get stuck in the detection head or cause the detection head to deform. Therefore, the existing detection head cannot detect defects in the entire section of the pipeline non-destructively, and the detection is not comprehensive enough. Summary of the Invention

[0005] The present invention provides a pipeline inner wall defect detection head and detection device to solve the problem that the above-mentioned detection head is easily stuck or deformed. The detection head can be contracted and expanded to adapt to the detection of pipeline inner walls with different inner diameters, ensuring detection while avoiding deformation or sticking caused by depressions.

[0006] In the first aspect, to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0007] A pipeline inner wall defect detection head includes a foldable arm consisting of a first connecting rod and a second connecting rod hingedly connected. The foldable arms are provided in a plurality and distributed circumferentially to form a shuttle-shaped detection head frame. One end of the detection head frame is hingedly connected to a first connecting seat, and the other end is hingedly connected to a second connecting seat. When the diameter of the detection head frame changes, the spacing between the first connecting seat and the second connecting seat changes accordingly. The detection head frame is also equipped with a reset structure for restoring the detection head frame to its initial diameter.

[0008] A photoelectric sensor module is installed inside the detection head frame, and the photoelectric sensor module is used to send an electrical signal when the distance between the first connecting seat and the second connecting seat changes;

[0009] A transmission mechanism is further installed on one end of the detection head frame, which is connected to a driving device through the transmission mechanism and is used to drive the detection head frame to rotate and advance toward the other end.

[0010] Preferably, the foldable arm further comprises an extension rod, both ends of the extension rod are hinged to the first connecting rod and the second connecting rod respectively, and the hinged structures are both hinge shafts.

[0011] Preferably, the first connecting rod, the second connecting rod and the extension rod all include a rod core and an outer sleeve sleeved on the outer wall of the rod core, and the outer sleeve is rotatably connected to the rod core.

[0012] Preferably, the first connecting seat is fixed on the transmission mechanism, a cross bar is installed on the first connecting seat, the second connecting seat is movably sleeved on the cross bar for moving along the length direction of the cross bar, and a reset structure is installed on the cross bar for resetting the second connecting seat after movement.

[0013] Preferably, the surface of the cross bar is provided with an adjusting thread groove, the outer wall of the adjusting thread groove is fitted with a mounting seat, the second connecting seat is movably fitted on the mounting seat, and the two sides of the mounting seat are also provided with a first locking nut and a second locking nut threadedly mounted on the adjusting thread groove, and the mounting seat is fixed to the cross bar by the first locking nut and the second locking nut.

[0014] Preferably, the mounting seat includes a hollow column, a sliding hole is provided on the second connecting seat, and the second connecting seat moves on the hollow column through the sliding hole. Baffles are also provided at both ends of the hollow column. The reset structure is a reset spring, and the reset spring is installed on the hollow column between the second connecting seat and the baffle.

[0015] Preferably, a limiting block is further provided on the outer wall of the hollow column, and a limiting groove is provided on the inner wall of the sliding hole, and relative rotation between the second connecting seat and the hollow column is limited by relative sliding between the limiting groove and the limiting block.

[0016] Preferably, there are at least three foldable arms, and the driving device is configured to drive the detection head frame to rotate at a rate that is negatively correlated with the number of the foldable arms.

[0017] Preferably, the transmission mechanism is a screw rod, and the driving device includes a motor and a gear driven by the motor, and the gear is meshed with the threads of the screw rod.

[0018] In the second aspect, to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0019] A detection device includes the detection head described in the first aspect, and also includes a base, the detection head is installed at one end of the base, and a support frame and a limiter for supporting the pipe to be tested are also installed in sequence on the base, and multiple support frames are provided, and the bottom of each support frame is connected to a lifting cylinder, and the limiter is installed on an electric slide rail.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The detection head frame is configured to be composed of circumferentially distributed foldable arms, and the first connecting rod and the second connecting rod of the foldable arms are hinged. Therefore, the bending angles of the foldable arms are different, and the diameters of the detection head frame are also different, thereby adapting to the matching of pipes with different inner diameters. In addition, the detection head frame adopts a rotary propulsion drive mode, and can rotate while moving on the inner wall of the pipe, so that a smaller number of foldable arms can be used to fully contact every part of the inner wall of the pipe, thereby reducing the occurrence of omissions.

[0022] 2. When the detection head frame composed of the foldable arms of the present invention is obstructed by defects on the inner wall of the pipeline, the extrusion force will cause the bending angle of the foldable arms to change, reducing the diameter of the detection head frame, thereby facilitating passage through the obstruction area. The reset spring can restore the detection head frame to its initial diameter, so that detection can continue after passing through the obstruction area. This is suitable for multi-point detection of pipelines and will not damage the detection head frame.

[0023] 3. The first connecting seat and the second connecting seat connected at both ends of the foldable arm of the present invention, when the diameter of the detection head frame changes, the distance between the two connecting seats also changes accordingly, and a photoelectric sensor module is used to detect whether the distance between the first connecting seat and the second connecting seat changes, thereby judging whether the diameter of the detection head frame changes. Compared with traditional pressure sensors, this method of using the distance change to judge whether a recessed obstruction is encountered has a simple structure and higher accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the overall structure of the detection head of the present invention;

[0025] Figure 2A schematic diagram of the structure of the detection head frame of the present invention after adding an extension rod;

[0026] Figure 3 The figure is a schematic diagram of the rod body structure of the connecting rod and the extension rod of the present invention.

[0027] Figure 4 This is a schematic diagram of the installation structure of the second connecting socket of the present invention.

[0028] Figure 5 It is a structural schematic diagram of the sliding hole and the limiting groove provided on the second connecting seat of the present invention.

[0029] Figure 6 Schematic diagram of the structure of the detection device of the present invention.

[0030] In the figure: 1. first connecting rod, 2. second connecting rod, 3. hinge shaft, 4. first connecting seat, 5. second connecting seat, 6. transmission mechanism, 7. cross bar, 8. transmitting end, 9. receiving end, 10. photoelectric sensor module, 11. mounting seat, 12. reset spring, 13. first locking nut, 14. second locking nut, 15. adjusting thread groove, 16. extension rod, 17. baffle, 18. hollow column, 19. limit block, 20. sliding hole, 21. limit groove, 22. rod core, 23. outer sleeve, 24. detection head frame, 25. motor, 26. gear, 27. base, 28. lifting cylinder, 29. support frame, 30. pipe to be tested, 31. limiter, 32. electric slide rail. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0032] Example 1

[0033] like Figure 1 As shown, a pipeline inner wall defect detection head is disclosed, including a foldable arm composed of a first connecting rod 1 and a second connecting rod 2, which are hingedly connected. The foldable arms are provided in a plurality and distributed circumferentially to form a shuttle-shaped detection head frame 24. One end of the detection head frame 24 is hinged to a first connecting seat 4, and the other end is hinged to a second connecting seat 5. When the diameter of the detection head frame 24 changes, the spacing between the first connecting seat 4 and the second connecting seat 5 changes accordingly. The detection head frame 24 is also equipped with a reset structure for restoring the detection head frame 24 to its initial diameter. A transmission mechanism 6 is also installed at one end of the detection head frame 24, which is connected to a drive device through the transmission mechanism 6 to drive the detection head frame 24 to rotate and propel toward the other end.

[0034] The detection head frame 24 is composed of a foldable arm, so when the bending angle between the first connecting rod 1 and the second connecting rod 2 of the foldable arm changes, the diameter of the detection head frame 24 also changes. Because the two ends of the foldable arm are respectively connected to the first connecting seat 4 and the second connecting seat 5, the distance between the two connecting seats will change when the bending angle changes. In this structure, the first connecting seat 4 and the second connecting seat 5 need to ensure that one of them is in a fixed state. The fixed state is to ensure that the detection head frame 24 can be resisted by the reverse thrust of the pipeline when entering the pipeline, so that it can enter the pipeline smoothly, while the other is in an active state to facilitate the change of the distance between the two connecting seats. Since the detection head frame 24 is rotated forward by the driving device when in use, the movement of the detection head frame 24 forms a cylindrical trajectory during the rotation process. The diameter of the detection head frame 24 is the diameter of the cylindrical trajectory. The rotational thrust is transmitted through the transmission mechanism 6, so that the detection head frame 24 can pass through the pipeline.

[0035] The principle of using the above-mentioned structural form to detect defects on the inner wall of a pipeline is as follows: If there are defects such as depressions or non-standard inner diameters in the pipeline, the inner diameter of the pipeline will be partially reduced. The size of the detection head frame 24 needs to meet the corresponding standard inner diameter of the pipeline. The reduced local area will squeeze the detection head frame 24, and the squeezing will increase the bending angle of the foldable arm, thereby increasing the distance between the first connecting seat 4 and the second connecting seat 5. At this time, the diameter of the detection head frame 24 will also be reduced, allowing it to pass through the reduced area inside the pipeline. After leaving this reduced area, under the action of the reset structure, the diameter of the detection head frame 24 will also return to the initial value, allowing it to perform subsequent pipeline inner wall defect detection. In this way, not only can normal detection be performed, but also when defects occur in the pipeline, the detection head frame 24 will be subjected to external force to reduce its diameter, allowing it to pass through the defective area smoothly, avoiding the phenomenon of the detection head frame 24 being stuck.

[0036] like Figure 1As shown, a photoelectric sensor module 10 is installed inside the detection head frame 24, and the photoelectric sensor module 10 is used to send an electrical signal when the distance between the first connecting seat 4 and the second connecting seat 5 changes; it can be seen from the above that in the process of detecting defects on the inner wall of the pipeline, when the detection head frame 24 passes through the defective area of ​​the pipeline, the distance between the first connecting seat 4 and the second connecting seat 5 will change. Compared with the traditional pressure sensor to detect the extrusion at the defect, the present invention selects the photoelectric sensor module 10 to perform defect detection. Since the traditional pressure sensor may produce false detection when the detection head vibrates, the use of the photoelectric sensor module 10 can effectively avoid such false detection. The detection principle is as follows: by detecting the change in the distance between the first connecting seat 4 and the second connecting seat 5, it is determined whether the detection head frame 24 is squeezed by the defect. When the distance changes, the photoelectric sensor module 10 can send an electrical signal. At this time, by recording the position of the detection head frame 24 in the pipeline when the electrical signal is sent, the defective area of ​​the pipeline can be accurately located, which can greatly improve the detection accuracy and defect positioning efficiency. The photoelectric sensor module 10 usually includes a transmitting end 8 and a receiving end 9. In order to detect whether the distance between the first connecting seat 4 and the second connecting seat 5 changes, the transmitting end 8 and the receiving end 9 can be installed on the two connecting seats respectively. The principle of ranging of the photoelectric sensor module 10 belongs to the existing technology, so the specific working method will not be described here.

[0037] According to the above, it can be seen that the detection head frame 24 is able to detect whether the inner diameter of the pipeline is standard because when the detection head frame 24 is rotated and pushed, the size of the cylindrical track formed can just match the inner diameter of the pipeline, so that the detection head frame 24 can fully contact the inner wall of the pipeline. However, since the foldable arm is hinged by the first connecting rod 1 and the second connecting rod 2, the detection head frame 24 is formed with pointed ends and wide in the middle, and the diameter of the cylindrical track is mainly determined by the wide part in the middle. Moreover, there are several foldable arms, so the outer wall of the detection head frame 24 is not sealed. If the width here is short and the rotation rate of the detection head frame 24 is too slow, there will be a small probability event, such as: the area of ​​the depression is very small, and the depression can just pass through the gap between the two foldable arms, so the detection head frame 24 needs to be further optimized, such as Figure 2 As shown, the foldable arm also includes an extension rod 16, and the two ends of the extension rod 16 are hinged to the first connecting rod 1 and the second connecting rod 2 respectively, and the hinged structure is a hinge shaft 3. The extension rod 16 is used to extend the width of the detection head frame 24 to increase its length. In this way, the portion in contact with the inner wall of the pipe is larger, and even if the above-mentioned low-probability event occurs, it can be detected by the extension rod 16. The extension rod 16 can effectively improve the detection accuracy and avoid missing defects.

[0038] In order to facilitate the detection head frame 24 to pass through the defective area in the pipeline, such as Figure 3As shown, the first connecting rod 1, the second connecting rod 2 and the extension rod 16 all include a rod core 22 and an outer sleeve 23 mounted on the outer wall of the rod core 22. The outer sleeve 23 is rotatably connected to the rod core 22. The rod bodies of the above-mentioned connecting rods and the extension rod 16 are both double-layer structures. The outer sleeve 23 can rotate relative to the rod core 22. This design is to fit the detection head frame 24 that rotates during work. If the detection head frame 24 touches the defect on the inner wall of the pipe during its rotation, the collision force is along the direction of rotation of the detection head frame 24, and the detection head frame The diameter of the frame 24 is reduced in a manner toward the axis, so there is an angle of nearly 90° between the directions of the two forces. The smaller the angle, the more the directions of the two forces are consistent. In this way, the detection head frame 24 is easier to shrink. Conversely, the larger the angle, the more difficult it is to shrink. At this time, the outer sleeve 23 is designed to be rotatable. No matter which direction the collision force is in, the outer sleeve 23 can be driven to rotate. The rotation will change the direction of the force and make it toward the axis of the detection head frame 24, so that the detection head frame 24 is easier to shrink.

[0039] As mentioned above, the first connecting seat 4 and the second connecting seat 5 need to ensure that one is in a fixed state and the other is in a movable state, such as Figure 1 As shown, the first connecting seat 4 is fixed on the transmission mechanism 6, the cross bar 7 is installed on the first connecting seat 4, the second connecting seat 5 is movably mounted on the cross bar 7, and is used to move along the length direction of the cross bar 7, and the reset structure is installed on the cross bar 7, which is used to reset the second connecting seat 5 after movement. The cross bar 7 can support the lateral movement of the second connecting seat 5. During the movement, the thrust generated by the reset structure is always toward the first connecting seat 4, so that even if the second connecting seat 5 moves away from the first connecting seat 4, it can be restored to its original position.

[0040] The above also describes the relationship between the spacing between the first connecting seat 4 and the second connecting seat 5 and the bending angle of the foldable arm. It is known that the bending angle of the foldable arm determines the diameter of the cylindrical track formed by the detection head frame 24 when it rotates. Therefore, we can arbitrarily choose to adjust the bending angle of the foldable arm or the spacing between the two connecting seats to change the diameter of the cylindrical track formed when the detection head frame 24 rotates. The bending angle of the foldable arm needs to change when it is subjected to extrusion force, so it is not convenient to adjust. Therefore, this article chooses to adjust the spacing between the first connecting seat 4 and the second connecting seat 5, such as Figure 1 and Figure 4As shown, the surface of the cross bar 7 is provided with an adjusting thread groove 15, the outer wall of the adjusting thread groove 15 is fitted with a mounting seat 11, and the second connecting seat 5 is movably fitted on the mounting seat 11. The two sides of the mounting seat 11 are also provided with a first locking nut 13 and a second locking nut 14 threadedly mounted on the adjusting thread groove 15. The mounting seat 11 is fixed to the cross bar 7 by the first locking nut 13 and the second locking nut 14. The mounting seat 11 is chosen here to be provided between the second connecting seat 5 and the cross bar 7 instead of direct contact between the two in order to avoid wear of the second connecting seat 5 by the adjusting thread groove 15. The second connecting seat 5 moves on the mounting seat 11, and the reset structure is installed on the mounting seat 11 to achieve reset. If you want to adjust the second connecting seat 5 and the first connecting seat 4, the position of the mounting seat 11 on the crossbar 7 can be adjusted. In this case, the surface of the crossbar 7 is provided with an adjustment thread groove 15, and the mounting seat 11 can be moved along the adjustment thread groove 15. The mounting seat 11 is then fixed in place with two left and right locking nuts. Therefore, when the diameter of the detection head frame 24 needs to be adjusted, the two locking nuts can be loosened. After the mounting seat 11 reaches the appropriate position, the locking nuts can be tightened. This method allows the detection head frame 24 to adapt to the inner wall defect detection of pipes with different inner diameters. For pipes with larger inner diameters, the mounting seat 11 is adjusted closer to the first connecting seat 4. For pipes with smaller inner diameters, the mounting seat 11 is adjusted away from the first connecting seat 4. During the actual adjustment process, because the first locking nut 13 is located on the side near the first connecting seat 4 and is inside the detection head frame 24, its size can be designed to be small without affecting the screwing movement, thus not occupying a lot of space and preventing the bending of the foldable arm.

[0041] like Figure 4As shown, the mounting seat 11 includes a hollow column 18, a sliding hole 20 is provided on the second connecting seat 5, and the sliding hole 20 is used to move on the hollow column 18. Baffles 17 are also provided at both ends of the hollow column 18. The reset structure is a reset spring 12. The reset spring 12 is installed on the hollow column 18 between the second connecting seat 5 and the baffle 17. The hollow column 18 is convenient for being mounted on the cross bar 7 so that it can move along the length direction of the cross bar 7, and the baffles 17 at both ends of the hollow column 18 also play a role in limiting the movement of the second connecting seat 5. Compared with the first locking nut 13 and the second locking nut 14 locking the mounting seat 11, when the reset structure is the reset spring 12, in order to ensure The elastic force required for resetting maintains a fixed value. The fixed resetting elastic force can not only maintain the stability of the entire detection head frame 24, but also deform when encountering extrusion. The resetting elastic force is determined by the deformation length of the resetting spring 12. If only the locking nut is used to limit the second connecting seat 5, it is necessary to contact the resetting spring 12, and the locking nut needs to be moved. After the movement is completed, the deformation length of the resetting spring 12 will change, thereby causing a change in the resetting elastic force, which will affect the stability of the detection head frame 24. Here, the baffle 17 is used in conjunction with the hollow column 18 to keep the deformation length of the resetting spring 12 fixed at all times to maintain the stability of the device.

[0042] like Figure 4 and Figure 5 As shown, the outer wall of the hollow column 18 is further provided with a limit block 19, and the inner wall of the sliding hole 20 is provided with a limit groove 21. The relative sliding of the limit groove 21 and the limit block 19 limits the relative rotation between the second connecting seat 5 and the hollow column 18. Although the hollow column 18 is installed on the cross bar 7, since the hollow column 18 can move on the cross bar 7, the two are movable. Since the second connecting seat 5 is connected to the first connecting seat 4, and the cross bar 7 is connected to the first connecting seat 4, the mounting seat 11 is equivalent to being independent of the second connecting seat 5 and the cross bar 7. In the possibility of rotation between the two, although the first locking nut 13 and the second locking nut 14 play the role of locking the mounting seat 11, when the entire detection head frame 24 rotates, if the mounting seat 11 shakes, the two locking nuts will become loose, resulting in the detection head frame 24 requiring frequent maintenance and insufficient stability in use. The use of the limit block 19 and the limit groove 21 allows the second connecting seat 5 to only slide axially with the hollow column 18, which can effectively avoid the shaking of the mounting seat 11 and maintain the locking effect of the locking nut.

[0043] like Figure 5As shown, there are at least three foldable arms, and the rotation rate of the detection head frame 24 driven by a driving device is negatively correlated with the number of foldable arms. At least three foldable arms can form a stable cylindrical trajectory when rotating. The more foldable arms there are, the smaller the gap between adjacent foldable arms, and vice versa. As mentioned above, it is easy to miss defects if the gap is large. At this time, it is necessary to increase the rotation speed of the detection head frame 24 so that the contact area between the detection head frame 24 and the inner wall of the pipe is larger in a short time. If there are more foldable arms, a higher rotation speed is not required, and a larger contact area with the inner wall of the pipe can be achieved in a short time. Therefore, the rotation speed of the detection head frame 24 is adjusted according to the number of foldable arms. The adjustment of the rotation speed can be set by rotating the driving device or by improving the transmission mechanism 6. In this solution, the most convenient way is to adjust the rotation speed of the driving device. Figure 6 As shown, the transmission mechanism 6 is a screw, and the driving device includes a motor 25 and a gear 26 driven by the motor 25. The gear 26 is engaged with the thread teeth of the screw, and the motor 25 drives the gear 26 to rotate, and the gear 26 is engaged with the screw. In this way, the screw and the gear 26 produce lateral movement during the rotation process, thereby realizing the rotation of the detection head frame 24. There are many ways to drive a structure to rotate and propel it. It is now only used as an embodiment of this solution, and other driving methods are not described one by one.

[0044] Example 2

[0045] like Figure 6 As shown, a detection device is disclosed, including the detection head as described in Example 1, and also including a base 27, the detection head is mounted on one end of the base 27, and a support frame 29 and a limiter 31 for supporting the pipe 30 to be tested are sequentially mounted on the base 27, a plurality of support frames 29 are provided, and the bottom of each support frame 29 is connected to a lifting cylinder 28, and the limiter 31 is mounted on an electric slide rail 32. The base 27 serves as a bracket for the entire detection device, and the detection head, the support frame 29 and the limiter 31 are sequentially mounted on it. It is used to support the pipe 30 to be tested so that the pipe 30 to be tested is in the same straight line with the detection head in the horizontal direction. The lifting cylinder 28 can be used to adjust the height of the pipe 30 to be tested so that it is in the same straight line with the detection head in the vertical direction, thereby ensuring that the detection head can smoothly enter the pipe 30 to be tested for pipeline inner wall defect detection. The limiter 31 is used to prevent the pipe 30 to be tested from moving horizontally. The electric slide 32 is used to drive the limiter 31 to move horizontally, so that it can limit the pipes 30 to be tested of different lengths.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0047] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A pipeline inner wall defect detection head, characterized in that: The invention comprises a foldable arm rod composed of a first connecting rod (1) and a second connecting rod (2) hingedly connected, wherein a plurality of the foldable arm rods are provided and distributed circumferentially to form a detection head frame (24) with a shuttle-shaped structure, wherein one end of the detection head frame (24) is hingedly connected to a first connecting seat (4), and the other end is hingedly connected to a second connecting seat (5), so that when the diameter of the detection head frame (24) changes, the distance between the first connecting seat (4) and the second connecting seat (5) changes accordingly, and a reset structure is also installed on the detection head frame (24) for restoring the detection head frame (24) to an initial diameter; A photoelectric sensor module (10) is installed inside the detection head frame (24), and the photoelectric sensor module (10) is used to send an electrical signal when the distance between the first connecting seat (4) and the second connecting seat (5) changes; A transmission mechanism (6) is also installed at one end of the detection head frame (24), which is connected to a driving device through the transmission mechanism (6) and is used to drive the detection head frame (24) to rotate and advance toward the other end; The foldable arm further comprises an extension rod (16), the two ends of the extension rod (16) being hinged to the first connecting rod (1) and the second connecting rod (2), respectively, and the hinged structures are hinge shafts (3); the first connecting rod (1), the second connecting rod (2) and the extension rod (16) all comprise a rod core (22) and an outer sleeve (23) sleeved on the outer wall of the rod core (22), and the outer sleeve (23) is rotatably connected to the rod core (22); The first connecting seat (4) is fixed on the transmission mechanism (6), a cross bar (7) is installed on the first connecting seat (4), the second connecting seat (5) is movably mounted on the cross bar (7) and is used to move along the length direction of the cross bar (7), a reset structure is installed on the cross bar (7) and is used to reset the second connecting seat (5) after moving, an adjusting thread groove (15) is provided on the surface of the cross bar (7), the outer wall of the adjusting thread groove (15) is mounted on the mounting seat (11), the second connecting seat (5) is movably mounted on the mounting seat (11), and threads are also provided on both sides of the mounting seat (11) to be mounted on the adjusting thread groove (15). 5), the first locking nut (13) and the second locking nut (14) on the mounting seat (11) are fixed to the cross bar (7) through the first locking nut (13) and the second locking nut (14), the mounting seat (11) includes a hollow column (18), a sliding hole (20) is opened on the second connecting seat (5), and the mounting seat (11) moves on the hollow column (18) through the sliding hole (20), and baffles (17) are also provided at both ends of the hollow column (18), and the reset structure is a reset spring (12), and the reset spring (12) is installed on the hollow column (18) between the second connecting seat (5) and the baffle (17).

2. A pipeline inner wall defect detection head according to claim 1, characterized in that: A limiting block (19) is further provided on the outer wall of the hollow column (18), and a limiting groove (21) is provided on the inner wall of the sliding hole (20). The relative sliding between the limiting groove (21) and the limiting block (19) limits the relative rotation between the second connecting seat (5) and the hollow column (18).

3. A pipeline inner wall defect detection head according to claim 1, characterized in that: At least three foldable arms are provided, and a driving device is provided to drive the detection head frame (24) to rotate at a rate that is negatively correlated with the number of the foldable arms.

4. A pipeline inner wall defect detection head according to claim 1 or 3, characterized in that: The transmission mechanism (6) is a screw rod, and the driving device includes a motor (25) and a gear (26) driven by the motor (25), and the gear (26) is meshed with the teeth of the screw rod.

5. A detection device, characterized in that: The invention comprises a detection head as described in any one of claims 1 to 4, and further comprises a base (27), wherein the detection head is mounted on one end of the base (27), and a support frame (29) and a limiter (31) for supporting the pipe (30) to be tested are also mounted in sequence on the base (27), wherein a plurality of support frames (29) are provided, and a lifting cylinder (28) is connected to the bottom of each support frame (29), and the limiter (31) is mounted on an electric slide rail (32).

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