A pipe inspection device

Abstract

This invention discloses a pipeline scanning device, comprising a first fixed support ring, a first transmission mechanism, a sensor support ring, a sliding mechanism, a second transmission mechanism, a shock-absorbing mechanism, and a second fixed support ring. The first fixed support ring, the sensor support ring, and the second fixed support ring constitute a detection ring group. The pipeline to be inspected is fixed on both sides of the first and second fixed support rings. Sufficient sensors are arranged on the sensor support ring along the circumferential direction of the pipe wall for scanning the pipeline. The sliding mechanism consists of two parts respectively set at the upper and lower parts of the detection ring group, which are movably connected to the sensor support ring through the shock-absorbing mechanism. The first transmission mechanism is connected to the detection ring group, and the second transmission mechanism is connected to the first transmission mechanism to realize the reciprocating movement of the sensor support ring in its axial direction. Compared with the current method of manual handheld sensor detection, this pipeline scanning device has the characteristics of high efficiency and accurate completion of pipeline scanning work.

Description

Technical Field

[0001] This invention relates to the field of non-destructive testing of pipelines, and in particular to a pipeline scanning device. Background Technology

[0002] In industries such as petroleum, chemical, and power, there are numerous metal pipelines of various specifications. Some pipelines suffer from corrosion, rupture, and other damage due to high-temperature and high-pressure environments, the transport of toxic or radioactive substances, and their own structural characteristics. This damage can easily lead to leaks, causing casualties, fires, explosions, and other accidents. Therefore, it is essential to inspect these pipelines for internal defects. Currently, external pipeline defect inspection relies heavily on manual, single-point checks, which suffers from low efficiency, high workload, and safety hazards. Furthermore, most rapid pipeline external wall inspection devices use a single probe to inspect a localized area of ​​the pipeline, limiting their application range and failing to provide blind-spot-free inspection, making them difficult to meet practical requirements. Therefore, there is a significant demand for pipeline external wall inspection devices capable of performing blind-spot-free scanning of internal pipeline defects.

[0003] Currently, pipeline external wall inspection mechanisms can be broadly categorized as follows: Pneumatic peristaltic type: This type of device moves using a peristaltic motion. Through the coordinated action and sequence of cylinders and clamping mechanisms, the reciprocating motion of the mechanism is achieved, ensuring that at least one pair of grippers clamps the pipeline during the process; Articulated type: This type of device consists of a series of rotating and moving joints, achieving movement on the pipeline by clamping it; Inner frame spiral type: This type of device consists of a cylindrical frame and three evenly distributed identical trolleys. After the wheels grip the pipe wall, the device spirals upwards or downwards by driving the wheels. Among them, the published patent CN202593668U discloses a mechanical structure for an external pipe walking robot, the published patent CN208239365U discloses a pipe scanning device based on a phased array dual probe, and the published patent CN109668964A discloses a pipe scanning frame. All of the above published patents disclose a pipe external wall scanning mechanism. The mechanisms in the first two published patents can only perform linear scanning of the pipe, and the mechanism in the third published patent can only complete a circular scanning of the pipe. Neither of them can complete a blind spot-free scanning of the pipe within a certain range, which easily leads to problems of incomplete pipe detection and low detection efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a pipeline inspection device that enables flexible sensor layout and effectively improves the speed and efficiency of detecting defects on the internal surface of pipelines.

[0005] Therefore, the technical solution of the present invention is as follows:

[0006] A pipeline inspection device includes a first fixed support ring, a first transmission mechanism, a sensor support ring, a sliding mechanism, a second transmission mechanism, and a second fixed support ring; wherein,

[0007] The first fixed support ring, sensor support ring, and second fixed support ring are arranged alternately and parallel to each other, with their central axes coinciding to form a detection ring group. The first and second fixed support rings are identical, each consisting of an annular body and several pads. The pads are arranged along the circumference of the annular body and detachably fixed to one side of its plate. The position of each pad in the radial direction of the annular plate is adjustable, allowing the first and second fixed support rings to be fixed to the outer wall of the pipe to be tested by the circumferentially arranged pads. The sensor support ring includes a left and right supporting semicircular rings that can be joined to form the annular plate, and several sensors evenly distributed along the circumference of the annular plate. Each sensor is arranged with the axis of its signal detection end perpendicular to the central axis of the annular plate, and the distance between the detection end of each sensor and the central axis of the annular plate is consistent. The number of sensors matches the outer diameter of the pipe, so that the detection range of all sensors can completely cover the circumference of the pipe to be tested.

[0008] The sliding mechanism consists of two strip plates, which are vertically positioned above and below the detection ring group, respectively, with their long sides parallel to the axis of the detection ring group. The top ends of the first and second fixed support rings are fixed to the two ends of the upper strip plate, and the bottom ends of the first and second fixed support rings are fixed to the two ends of the lower strip plate. The top and bottom ends of the sensor support ring are reciprocally movable on the two strip plates.

[0009] The first transmission mechanism consists of two sets of lead screw assemblies, which are symmetrically arranged on both sides of the detection ring group. The nut of each lead screw assembly is fixed to the ring side of the sensor support ring, and the two ends of the lead screw are rotatably fixed to the ring sides of the first fixed support ring and the second fixed support ring, respectively.

[0010] The second transmission mechanism is connected to the two lead screws in the first transmission mechanism to drive the two lead screws to rotate synchronously and in the same direction.

[0011] Furthermore, the second transmission mechanism includes two vertical synchronous belts, two synchronous pulley frames, a first synchronous pulley, a drive device, a transverse synchronous belt, a double synchronous pulley, and two second synchronous pulleys. The two synchronous pulley frames are symmetrically arranged on both sides of the first fixed support ring. The top of each synchronous pulley frame is fixed to the first fixed support ring, and its bottom is located below the lead screw on the same side. The first synchronous pulley and the double synchronous pulley are rotatably fixed to the bottom of the two synchronous pulley frames, and are connected by the transverse synchronous belt to form a belt drive. The drive device is installed in the central hole of the first synchronous pulley to drive its rotation. The two second synchronous pulleys are fixed to the ends of the two lead screws to drive them to rotate synchronously, and are connected by a vertical synchronous belt to form a belt drive. The double synchronous pulley and the second synchronous pulley on the same side are connected by another vertical synchronous belt to form a belt drive. The drive device is a handwheel or a manual crank, or a motor can be selected according to testing needs (e.g., an explosion-proof motor is required in the petroleum industry).

[0012] Furthermore, the pipeline inspection device also includes a shock-absorbing assembly, which consists of an upper shock-absorbing group and a lower shock-absorbing group with the same structure; the upper shock-absorbing group and the lower shock-absorbing group are respectively fixed to the top and bottom of the sensor support ring, and both are composed of two symmetrically arranged shock-absorbing structures; the two symmetrically arranged shock-absorbing structures in each shock-absorbing group are sandwiched on both sides of the strip plate and contact the surface of the strip plate in a rolling friction manner.

[0013] Furthermore, the damping structure includes a bearing mounting bracket, a damping spring assembly, a bearing support roller, and a rolling bearing. The bearing mounting bracket is a U-shaped frame formed by sequentially connecting a top plate, side plates, and a bottom plate. A strip-shaped through hole is formed at the center of the top plate in a direction perpendicular to the side plates, and a strip-shaped groove is formed at the center of the upper surface of the bottom plate in a direction perpendicular to the side plates. The rolling bearing is inserted between the top and bottom plates of the U-shaped frame, with its outer ring exposed outside the bearing mounting bracket. The bearing support roller is a rod with rectangular radial sections at both ends and a circular radial section in the middle, through which… The bearing is installed and fixed in the center hole of the rolling bearing, with its two ends located in the strip-shaped through hole of the top plate of the U-shaped frame and the strip-shaped groove of its bottom plate, respectively; the shock-absorbing spring assembly consists of two shock-absorbing springs; one shock-absorbing spring is set in the strip-shaped through hole of the top plate and its two ends are fixed to the hole wall of the strip-shaped through hole and the top side wall of the bearing support roller, respectively; the other shock-absorbing spring is set in the strip-shaped groove of the bottom plate and its two ends are fixed to the groove wall and the bottom side wall of the bearing support roller, respectively; two connecting parts are symmetrically arranged on the bottom surface of the bottom plate of the bearing fixing bracket to fix it to the sensor support ring.

[0014] Furthermore, the damping structure includes a bullseye wheel, an upper fixed bracket, a second damping spring assembly, and a lower fixed bracket. The upper fixed bracket consists of a first vertical plate and a cross-shaped boss protruding from one side of the first vertical plate, dividing the four corners of that side plate into four spring mounting slots. The lower fixed bracket consists of a second vertical plate and two connecting plates symmetrically fixed to the bottom surface of the second vertical plate, with the second vertical plate parallel to and spaced apart from the first vertical plate. The second damping spring assembly consists of four damping springs, each positioned within one of the four spring mounting slots of the upper fixed bracket, with both ends fixed to opposite sides of the first and second vertical plates. The bullseye wheel is centrally fixed to the other side of the upper fixed bracket.

[0015] Furthermore, multiple through slots are evenly distributed along the circumference on one side plate of the annular body, and multiple pairs of through holes are opened at intervals from the inner circumferential surface of the arc-shaped fixing plate to its outer circumferential surface at the bottom of the through slots. A pair of fixing holes are opened on the pad, so that it can be detachably fixed in any pair of through holes of the through slot by two matching bolts, so as to adjust the distance of the pad protruding from the inner circumferential surface of the annular body.

[0016] Furthermore, two handles are symmetrically installed on the outer edge of the upper part of the annular body of both the first and second fixed support rings.

[0017] Furthermore, the inner diameter of the detection ring assembly is 5-15 mm larger than the outer diameter of the pipe to be tested.

[0018] Furthermore, two sets of buffer pads are symmetrically arranged at the top and bottom of the annular inner plate surface of the first and second fixed support rings; the buffer pads are circular rubber pads with a thickness of 3~5mm.

[0019] Furthermore, the annular body is formed by connecting four equally divided arc-shaped fixing plates end to end; two arc-shaped fixing plates are connected and fixed together by a fixing plate connector to form a left fixed half-ring, and two other arc-shaped fixing plates are connected and fixed together by another fixing plate connector to form a right fixed half-ring; the upper connecting ends of the left and right fixed half-rings are symmetrically fixed to both sides of a track connector, and their lower connecting ends are symmetrically fixed to both sides of another track connector; the left and right supporting semi-rings are both composed of two arc-shaped support plates, and the two arc-shaped support plates are connected and fixed together by bolts through a support plate connector to form a half-ring; the upper and lower connecting ends of the left and right supporting semi-rings are respectively connected by two second supporting connectors.

[0020] Furthermore, a wire guide groove is provided on each arc-shaped support plate so that the signal lines of the three sensors located on the same arc-shaped support plate are all collected in the wire guide groove.

[0021] Furthermore, the track connector consists of two split vertical plates, and the strip plate consists of two split strip thin plates. Each vertical plate is detachably fixed to the end of the supporting semi-circular ring and the strip thin plate on the same side. Two positioning posts are symmetrically arranged on the mating surface of one strip thin plate, and two positioning grooves are symmetrically arranged on the mating surface of the other strip thin plate, so that the two strip thin plates can be neatly aligned by assembling the two positioning posts of one strip thin plate into the two positioning grooves respectively.

[0022] Compared with existing technologies, this pipeline scanning device features a detection ring structure, consisting of fixed support rings on both sides to secure the pipeline to be inspected and sensor support rings with sufficient sensors arranged along the circumference of the pipe wall. Simultaneously, a synchronous transmission system is constructed using a combination of screw and belt drive mechanisms. The synchronous belt drive is driven manually or electrically, which in turn drives the two screw assemblies to rotate synchronously. The screw drives the screw nut, which in turn moves the sensor support rings along the axis of the pipeline to be inspected, thus completing the pipeline scanning work. Compared with current methods of manual handheld sensor inspection, this scanning mechanism is highly efficient and accurately completes the pipeline scanning work. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pipe inspection device according to Embodiment 1 of the present invention;

[0024] Figure 2 This is a partial structural schematic diagram of the pipeline inspection device according to Embodiment 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of the sensor support ring of the pipeline inspection device according to Embodiment 1 of the present invention;

[0026] Figure 4 This is a schematic diagram of the sliding mechanism of the pipeline inspection device according to Embodiment 1 of the present invention;

[0027] Figure 5(a) is a schematic diagram of the shock absorption structure of the pipeline inspection device of Embodiment 1 of the present invention;

[0028] Figure 5(b) is a schematic diagram of the shock absorption structure of the pipeline inspection device of Embodiment 2 of the present invention;

[0029] Figure 6 This is a schematic diagram of the pipe inspection device according to Embodiment 2 of the present invention;

[0030] Figure 7 This is a schematic diagram of the pipe inspection device in use according to Embodiment 1 of the present invention. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.

[0032] Example 1

[0033] like Figure 1 As shown, the pipeline scanning device includes a first fixed support ring 1, a first transmission mechanism 2, a sensor support ring 3, a sliding mechanism 4, a second transmission mechanism 5, a shock absorption assembly 6, and a second fixed support ring 7; wherein,

[0034] The first fixed support ring 1, the sensor support ring 3, and the second fixed support ring 7 are arranged in sequence at intervals and placed parallel to each other, with their central axes coinciding to form a detection ring group; the inner diameter of the detection ring group matches the outer diameter of the pipe to be detected; in this embodiment, the inner diameter of the detection ring group is 10mm larger than the outer diameter of the pipe to be detected.

[0035] like Figure 2 As shown, the first fixed support ring 1 and the second fixed support ring 7 have identical structures and dimensions; the structure of the two is explained using the first fixed support ring 1 as an example:

[0036] The first fixed support ring 1 includes an annular body 1a and eight pads 1b; wherein...

[0037] The annular body 1a is an annular plate with an octagonal outer circumference and a circular inner circumference. In this embodiment, due to its large size, it is not suitable to manufacture it as a single piece. Furthermore, to facilitate partial replacement in case of damage and save costs, the annular body 1a is assembled using a modular structure. Specifically,

[0038] The annular body 1a is formed by connecting four arc-shaped fixing plates end to end. Two arc-shaped fixing plates are connected and fixed together by a fixing plate connector 1e with bolts to form a left fixed half-ring. The annular body 1a is formed by connecting two outer arc-shaped fixing plates together by another fixing plate connector 1e with bolts to form a right fixed half-ring. The upper connecting ends of the left and right fixed half-rings are symmetrically fixed to both sides of a track connector 1f, and the lower connecting ends are symmetrically fixed to both sides of another track connector 1f.

[0039] Two through slots for setting up pads 1b are evenly distributed on one side of each arc-shaped fixing plate, and multiple pairs of through holes penetrating the plate surface are opened at the bottom of the slots. The multiple pairs of through holes are opened radially along the annular body 1a. A pair of fixing holes are opened on the pads 1b, so that they can be detachably fixed in any pair of through holes of the through slots by two matching bolts. This allows for adjustment of the exposed length of the pads 1b relative to the inner arc surface of the arc-shaped fixing plate. In actual use, by adjusting the position of the pads 1b on the arc-shaped fixing plate, the inner diameter of the annular body 1a can be finely adjusted to ensure that the first fixed support ring 1 is fixed to the outer wall of the tube to be tested by the eight pads 1b. Preferably, the pads 1b are set on the side plate that is not opposite to the sensor support ring 3.

[0040] In addition, a transmission plate mounting groove is provided on the surface of each arc-shaped fixing plate near the outer periphery.

[0041] As a preferred technical solution of this embodiment, two handles 1d are symmetrically added to the outer edge of the upper part of the annular body 1a, which facilitates the assembly of the annular body 1a and the overall handling and disassembly of the device during use.

[0042] like Figure 3 As shown, the sensor support ring 3 includes a left supporting semicircular ring 3a, a right supporting semicircular ring 3b, and twelve sensors 3e; wherein,

[0043] The left supporting semicircular ring 3a and the right supporting semicircular ring 3b can be joined together to form a ring plate with both the inner and outer circumferences being circular.

[0044] Twelve sensors 3e are evenly distributed along the circumference of the annular plate. Each sensor 3e is positioned with the axis of its signal detection end perpendicular to the central axis of the annular plate, and the distance between the detection end of each sensor 3e and the central axis of the annular plate is kept consistent. This layout ensures that when the pipe under test is centered in the detection ring group, the twelve sensors 3e are evenly distributed along the outer wall of the pipe at 360 degrees.

[0045] The number of sensors is matched with the outer diameter of the pipe to ensure that the detection range of all sensors can cover the circumference of the pipe to be detected without any blind spots; therefore, in this embodiment, the number of sensors is set to twelve based on the outer diameter of the pipe to be detected.

[0046] In this embodiment, also due to the large volume of the annular plate, it is not suitable to manufacture it as a single piece. Furthermore, to facilitate partial replacement in case of damage and save costs, both the left supporting semi-circular ring 3a and the right supporting semi-circular ring 3b are assembled using a split structure. Specifically,

[0047] Both the left supporting semicircular ring 3a and the right supporting semicircular ring 3b are composed of two arc-shaped support plates, and the two arc-shaped support plates are connected and fixed together by bolts through the support plate connector 3d to form a semicircular body; the upper and lower connecting ends of the left supporting semicircular ring 3a and the right supporting semicircular ring 3b are connected by two second support connectors 3f respectively.

[0048] The twelve sensors 3e are evenly divided into four groups, with three sensors evenly distributed on each arc-shaped support plate. At the same time, in order to facilitate cable management, a cable tray 3c is also provided in the middle of each arc-shaped support plate, so that the signal lines of the three sensors are collected in the cable tray 3c. In addition, the side of the cable tray has openings for fixing the signal lines of the sensors. In use, the connection end is led out from the cable tray 3c to connect to the external signal acquisition equipment.

[0049] As a preferred technical solution of this embodiment, since the sensor support ring 3 reciprocates between the first fixed support ring 1 and the second fixed support ring 7 during actual use, in order to avoid collisions between the sensor support ring 3 and the first fixed support ring 1, and / or between the sensor support ring 3 and the second fixed support ring 7, two sets of buffer pads 1g are symmetrically provided at the top and bottom of the annular inner plate surface of the first fixed support ring 1 and the second fixed support ring 7; specifically, the buffer pad 1g is a circular heat-insulating rubber pad with a thickness of 3~5mm.

[0050] like Figure 1 As shown, the first transmission mechanism 2 consists of two sets of trapezoidal screw assemblies, which are symmetrically arranged on both sides of the detection ring group. Specifically, each trapezoidal screw assembly consists of a trapezoidal nut 2a and a trapezoidal screw 2b. On the first fixed support ring 1, the sensor support ring 3, and the second fixed support ring 7, two fixed plate connectors 1e and one support plate connector 3d located on the same side are provided with mounting through holes along the axial direction of the detection ring group. The trapezoidal nut 2a is fitted and fixed in the mounting through hole of the support plate connector 3d, so as to connect and fix it to the sensor support ring 3 as a whole. The two ends of the trapezoidal screw 2b that cooperates with the trapezoidal nut 2a are rotatably fixed in the mounting through holes of the two fixed plate connectors 1e through rotary bearings, and the end located on the side of the first fixed support ring 1 extends out of the mounting through hole as a transmission connection end.

[0051] like Figure 4As shown, the sliding mechanism 4 is composed of two strip plates 4a, which are vertically arranged above and below the detection ring group with their long sides parallel to the axis of the detection ring group, respectively. Each strip plate 4a has two ends extending along the width direction to form a limiting end 4c, and the limiting end 4c has a through hole, so that the first fixed support ring 1 and the second fixed support ring 7 are fixed to the two limiting ends of the strip plate 4a above the detection ring group by means of screws through the track connector 1f located at the upper end of the annular body 1a, and are fixed to the two limiting ends of the strip plate 4a below the detection ring group by means of screws through the track connector 1f located at the lower end of the annular body 1a.

[0052] In this embodiment, considering the large size and inconvenient assembly of the first fixed support ring 1 and the second fixed support ring 7, the track connector 1f is composed of two rectangular vertical plates split in half, and the strip plate 4a is composed of two strip thin plates split in half. During assembly, each rectangular vertical plate is first fixed to the end of the supporting semi-circular ring on the same side by screws, and then fixed to the strip thin plate on the same side by screws. Finally, the two strip thin plates are joined together and fixed into one piece by screws to complete the assembly of the two fixed support rings.

[0053] As a preferred technical solution of this embodiment, in order to ensure the neatness of the two strip plates when they are joined, two positioning posts 4b are symmetrically arranged on the mating surface of one strip plate, and two positioning grooves are symmetrically arranged on the mating surface of the other strip plate in a corresponding manner; when the two strip plates are joined, the neatness of the two plates is achieved by assembling the two positioning posts of one strip plate into the two positioning grooves respectively.

[0054] like Figure 2 As shown, the second transmission mechanism 5 includes two vertical synchronous belts 5a, two synchronous pulley frames 5b, a first synchronous pulley 5c, a crank handle 5d, a horizontal synchronous belt 5e, a double synchronous pulley 5f, and two second synchronous pulleys 5g; wherein,

[0055] The timing pulley frame 5b is a strip plate. Two timing pulley frames 5b are symmetrically arranged on the outer side of the first fixed support ring 1, and their top ends are fixed by screws in the two transmission plate mounting slots located on the lower side of the first fixed support ring 1 and symmetrically arranged, so that their bottom ends are located below the transmission connection end of the trapezoidal lead screw 2b on the same side.

[0056] The first synchronous pulley 5c and the double synchronous pulley 5f are rotatably fixed to the bottom ends of the two synchronous pulley frames 5b by a cylindrical connector. Specifically, the cylindrical connector is arranged with its axis parallel to the detection ring group, and one end is fixed to the bottom end of the corresponding synchronous pulley frame 5b by a bolt, while the other end is inserted into and fixed in the center hole of the first synchronous pulley 5c or the double synchronous pulley 5f. At the same time, the first synchronous pulley 5c and the double synchronous pulley 5f are connected by a transverse synchronous belt 5e, so that a belt drive is formed between the first synchronous pulley 5c and the double synchronous pulley 5f.

[0057] The connecting end of the crank handle 5d is installed in the center hole of the first synchronous pulley 5c, so that the first synchronous pulley 5c can be driven to rotate by turning the crank handle 5d, thereby driving the double synchronous pulley 5f to rotate synchronously with the first synchronous pulley 5c.

[0058] Two second synchronous pulleys 5g are respectively fitted and fixed to the transmission connection ends of two trapezoidal lead screws 2b. At the same time, the first synchronous pulley 5c and the second synchronous pulley 5g located on the same side are connected by a vertical synchronous belt 5a, so that the two form a belt drive, realizing that the first synchronous pulley 5c drives the second synchronous pulley 5g to rotate synchronously. The double synchronous pulley 5f and the second synchronous pulley 5g located on the same side are connected by another vertical synchronous belt 5a, so that the two form a belt drive, realizing that the double synchronous pulley 5f drives the second synchronous pulley 5g to rotate synchronously. In addition, the two second synchronous pulleys 5g drive the two trapezoidal lead screws 2b to rotate synchronously, so as to drive the trapezoidal nut 2a to drive the sensor support ring 3 to move along the axis of the detection ring group.

[0059] like Figure 3 As shown, the damping assembly 6 consists of an upper damping group and a lower damping group, both of which have the same structure; the structure of the upper damping group will be explained using the upper damping group as an example:

[0060] The upper damping group is set between the annular body of the sensor support ring 3 and the second support connector 3f. Specifically, the upper damping group consists of two damping structures arranged symmetrically.

[0061] like Figure 5aAs shown, each damping structure includes a bearing fixing bracket 6a, a damping spring assembly 6b, a bearing support roller 6c, and a rolling bearing 6d. The bearing fixing bracket 6a is a U-shaped frame formed by connecting a top plate, a side plate, and a bottom plate in sequence. A strip-shaped through hole is formed at the center of the top plate in a direction perpendicular to the side plate, and a strip-shaped groove is formed at the center of the upper surface of the bottom plate in a direction perpendicular to the side plate. The rolling bearing 6d is inserted between the top plate and the bottom plate of the U-shaped frame, with its outer ring exposed outside the bearing fixing bracket 6a. The bearing support roller 6c is a rod with rectangular radial sections at both ends and a circular radial section in the middle. It passes through and is fixed in the central hole of the rolling bearing 6d, with its two ends located at the strip-shaped grooves on the top plate of the U-shaped frame. The damping spring assembly 6b consists of two damping springs. One damping spring is installed in the strip-shaped through hole of the top plate and its two ends are fixed to the wall of the strip-shaped through hole and the top side wall of the bearing support roller 6c, respectively, so that the top of the bearing support roller 6c can reciprocate in a direction perpendicular to the side plate under the action of the spring. The other damping spring is installed in the strip-shaped groove of the bottom plate and its two ends are fixed to the groove wall and the bottom side wall of the bearing support roller 6c, respectively, so that the bottom of the bearing support roller 6c can reciprocate in a direction perpendicular to the side plate under the action of the spring. Based on this, the damping structure enables the rolling bearing 6d to reciprocate in a direction perpendicular to the side plate within the bearing fixing bracket 6a.

[0062] Two connecting parts are symmetrically arranged on the bottom surface of the base plate of the bearing fixing bracket 6a, so that the two damping structures can be fixed to the upper connecting ends of the left support semicircular ring 3a and the right support semicircular ring 3b respectively by screws with the rolling bearings 6d facing each other and leaving a gap; the second support connector 3f is fixed to the top plate of the bearing fixing bracket 6a of the two damping structures by screws, so that the upper parts of the left support semicircular ring 3a and the right support semicircular ring 3b are connected.

[0063] Similarly, the lower damping assembly consists of two symmetrically arranged damping structures. The two structures are fixed to the lower connecting ends of the left support semicircular ring 3a and the right support semicircular ring 3b respectively by screws with their rolling bearings 6d facing each other and leaving a gap. The second support connector 3f is fixed to the top plate of the bearing fixing bracket 6a of the two damping structures by screws, so that the lower parts of the left support semicircular ring 3a and the right support semicircular ring 3b are connected.

[0064] In use, the upper shock absorber is clamped on both sides of the strip plate 4a located above the detection ring group, and its two rolling bearings 6d are in contact with the two side surfaces of the strip plate 4a; the lower shock absorber is clamped on both sides of the strip plate 4a located below the detection ring group, and its two rolling bearings 6d are in contact with the two side surfaces of the strip plate 4a; under normal conditions, the rolling bearings 6d rotate along their own axis, and when the rolling bearings 6d are subjected to changes in horizontal force, the horizontal distance of the rolling bearings can be adjusted by the shock absorber springs, thereby ensuring the smooth movement of the sensor support ring 3.

[0065] In this embodiment, based on the consideration of anti-signal interference, the annular body 1a, the left supporting semi-circular body 3a, the right supporting semi-circular body 3b, the wire groove 3c, the second supporting connector 3f, the synchronous pulley frame 5b, the bearing fixing bracket 6a, the bearing supporting roller 6c, and the bolts used for connection and fixation in the pipeline scanning device are all made of polyoxymethylene (POM); the fixing plate connector 1e, the track connector 1f, the support plate connector 3d, and the sliding mechanism 4 are all made of glass fiber.

[0066] Example 2

[0067] The pipe scanning device has a basically the same structure as the pipe scanning device in Embodiment 1. The difference is that in this embodiment, the shock absorption component is replaced with another structure. Specifically, the shock absorption component is also composed of an upper shock absorption group and a lower shock absorption group, and the two have the same structure.

[0068] The structure of the above damping group is explained using this example: the upper damping group is located between the annular body of the sensor support ring 3 and the second support connector 3f. Specifically, the upper damping group consists of two symmetrically arranged damping structures; for example... Figure 5b As shown, each damping structure includes a bullseye wheel 6i, an upper fixed bracket 6e, a second damping spring assembly 6f, and a lower fixed bracket 6g. The upper fixed bracket 6e consists of a first vertical plate and a cross-shaped boss protruding from one side of the first vertical plate, dividing the four corners of this side plate into four spring mounting slots. The lower fixed bracket 6g consists of a second vertical plate and two connecting plates 6h symmetrically fixed to the bottom surface of the second vertical plate, with the second vertical plate parallel to and spaced apart from the first vertical plate. The second damping spring assembly 6f consists of four damping springs, each installed in one of the four spring mounting slots of the upper fixed bracket 6e, with both ends fixed to opposite sides of the first and second vertical plates. The bullseye wheel 6i is centrally fixed to the other side of the upper fixed bracket 6e.

[0069] Two damping structures are arranged with their bullseye wheels 6i facing each other and leaving a gap. They are fixed to the upper connecting ends of the left supporting semicircular ring 3a and the right supporting semicircular ring 3b by screws through two connecting plates 6h at the bottom of their respective lower fixed brackets 6g. The second support connector 3f is fixed to the top surface of the lower fixed brackets 6g of the two damping structures by screws, connecting the upper parts of the left supporting semicircular ring 3a and the right supporting semicircular ring 3b. Similarly, the lower damping group consists of two symmetrically arranged damping structures. They are arranged in opposite directions with their bullseye wheels 6i facing each other and leaving a gap. They are fixed to the lower connecting ends of the left supporting semicircular ring 3a and the right supporting semicircular ring 3b by screws through two connecting plates 6h at the bottom of their respective lower fixed brackets 6g. The second support connector 3f is fixed to the top surface of the lower fixed brackets 6g of the two damping structures by screws, connecting the lower parts of the left supporting semicircular ring 3a and the right supporting semicircular ring 3b.

[0070] In use, the two bullseye wheels 6i of the upper shock-absorbing structure are clamped on both sides of the strip plate 4a located above the detection ring group and in contact with the surface of the strip plate 4a; the two bullseye wheels 6i of the lower shock-absorbing structure are clamped on both sides of the strip plate 4a located below the detection ring group and in contact with the surface of the strip plate 4a; when the bullseye wheels 6i are subjected to changes in horizontal force, their horizontal position can be adjusted by the shock-absorbing spring group, thereby ensuring the smooth movement of the sensor support ring 3.

[0071] In this embodiment, for the purpose of resisting signal interference, the upper fixing bracket 6e and the lower fixing bracket 6g are made of polyoxymethylene (POM).

[0072] Compared with the shock absorption mechanism of Embodiment 1, the shock absorption mechanism of Embodiment 2 uses a bullseye wheel 6i to replace the rolling bearing, which not only reduces the weight of the shock absorption mechanism, but also, compared with the rolling bearing, the bullseye wheel 6i is a universal wheel, which is more stable when reciprocating relative to the strip plate 4a.

[0073] Example 3

[0074] like Figure 6 As shown, the pipe inspection device has the same basic structure as the pipe inspection device in Embodiment 1. The difference is that in this embodiment, the crank 5d in the second transmission mechanism 5 is replaced with an explosion-proof motor 5k. At the same time, a U-shaped flange bracket 5j is bolted to the bottom end of the synchronous pulley frame 5b on the side where the explosion-proof motor 5k is installed. The explosion-proof motor 5k is fixed on the U-shaped flange bracket 5j in such a way that its output shaft axis is aligned with the axis of the crank 5d connection end in Embodiment 1. Its output shaft is installed and fixed in the center hole of the first synchronous pulley 5c, so that the explosion-proof motor 5k drives the first synchronous pulley 5c to rotate.

[0075] Compared with the manual drive in Example 1, the use of an explosion-proof motor 5k to drive the first synchronous pulley in Example 2 can further improve the stability of the sensor bracket ring 3 during operation.

[0076] like Figure 7 As shown, the method of using this pipeline inspection device is as follows:

[0077] S1. Using the handles on the first and second fixed support rings, hoist or transport the device to the pipeline to be tested and fit it on the outside of the pipeline to be tested; since the pipeline temperature is relatively high, a heat insulation layer is first wrapped on the outer wall of the pipeline before the above steps.

[0078] S2. Adjust the position of each pad of the first fixed support ring and the second fixed support ring according to the outer diameter of the pipe to be tested, so that the first fixed support ring and the second fixed support ring can be clamped and fixed on the outer wall of the pipe to be tested.

[0079] S3. After passing the signal transmission lines of each sensor on the sensor support ring through the corresponding cable trays, connect them to the external signal acquisition equipment.

[0080] S4. Drive the sensor bracket ring 3 smoothly from one end of the device to the other end of the device along the axial direction of the pipe to be tested by a crank or motor. The sensor collects the corresponding signal. The scanning speed range is 1mm / s to 30mm / s.

[0081] Specifically, the sensor can be an eddy current sensor, which continuously transmits voltage or current signals to the pipeline being inspected to obtain feedback voltage or current signals along the scanning path. By analyzing the changing trends of the feedback voltage or current signals, the internal characteristics of the pipeline can be identified. During use, the sensor support ring 3 collects induced current signals as it moves, thereby evaluating the defects in the inner wall of the pipeline.

[0082] 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pipeline inspection device, characterized in that, It includes a first fixed support ring (1), a first transmission mechanism (2), a sensor support ring (3), a sliding mechanism (4), a second transmission mechanism (5), a shock absorption assembly (6), and a second fixed support ring (7); wherein, The first fixed support ring (1), the sensor support ring (3), and the second fixed support ring (7) are arranged in sequence at intervals and placed parallel to each other, with their central axes coinciding to form a detection ring group. The first fixed support ring (1) and the second fixed support ring (7) are the same, both consisting of an annular body and several pads (1b). Several pads (1b) are arranged along the circumference of the annular body and detachably fixed to one side of its plate. The position of each pad (1b) in the radial direction of the annular plate is adjustable, so that the first fixed support ring (1) and the second fixed support ring (7) can be connected by means of the circumferential arrangement of the pads. The pad is fixed on the outer wall of the pipe to be tested; the sensor support ring (3) includes a left support semicircular ring (3a) and a right support semicircular ring (3b) that can be joined to form an annular plate, and a number of sensors (3e) evenly distributed along the circumference of the annular plate; each sensor (3e) is set with its signal detection end axis direction perpendicular to the central axis of the annular plate, and the detection end of each sensor (3e) is kept at the same distance from the central axis of the annular plate; the number of sensors (3e) matches the outer diameter of the pipe, so that the detection range of all sensors can completely cover the circumference of the pipe to be tested; The sliding mechanism (4) consists of two strip plates (4a), which are vertically arranged above and below the detection ring group with their long sides parallel to the axis of the detection ring group. The top ends of the first fixed support ring (1) and the second fixed support ring (7) are fixed to the two ends of the strip plate (4a) above them, and the bottom ends of the first fixed support ring (1) and the second fixed support ring (7) are fixed to the two ends of the strip plate (4a) below them. The top and bottom ends of the sensor support ring (3) are reciprocally movable on the two strip plates (4a). The damping assembly (6) consists of an upper damping group and a lower damping group with the same structure. The upper damping group and the lower damping group are fixed to the top and bottom of the sensor support ring (3), and both are composed of two damping structures arranged symmetrically. The two damping structures in each damping group are symmetrically arranged and sandwiched on both sides of the strip plate (4a) and contact the strip plate surface with rolling friction. The first transmission mechanism (2) consists of two sets of lead screw assemblies, which are symmetrically arranged on both sides of the detection ring group. The nut (2a) of each set of lead screw assembly is fixed on the ring side of the sensor support ring (3), and the two ends of the lead screw (2b) are rotatably fixed on the ring side of the first fixed support ring (1) and the second fixed support ring (7), respectively. The second transmission mechanism (5) is connected to the two lead screws (2b) in the first transmission mechanism (2) to drive the two lead screws (2b) to rotate synchronously and in the same direction. The shock-absorbing structure includes a bearing fixing bracket (6a), a shock-absorbing spring assembly (6b), a bearing support roller (6c), and a rolling bearing (6d). The bearing fixing bracket (6a) is a U-shaped frame formed by connecting a top plate, a side plate, and a bottom plate in sequence. A strip-shaped through hole is opened at the center of the top plate in a direction perpendicular to the side plate, and a strip-shaped groove is opened at the center of the upper surface of the bottom plate in a direction perpendicular to the side plate. The rolling bearing (6d) is inserted between the top plate and the bottom plate of the U-shaped frame, and its outer ring is exposed outside the bearing fixing bracket (6a). The bearing support roller (6c) is a rod with a rectangular radial cross-section at both ends and a circular radial cross-section in the middle. The body is inserted and fixed in the center hole of the rolling bearing (6d), and its two ends are respectively located in the strip-shaped through hole of the top plate of the U-shaped frame and in the strip-shaped groove of its bottom plate; the shock-absorbing spring assembly (6b) consists of two shock-absorbing springs; one shock-absorbing spring is set in the strip-shaped through hole of the top plate and its two ends are respectively fixed to the wall of the strip-shaped through hole and the top side wall of the bearing support roller (6c); the other shock-absorbing spring is set in the strip-shaped groove of the bottom plate and its two ends are respectively fixed to the groove wall and the bottom side wall of the bearing support roller (6c); two connecting parts are symmetrically arranged on the bottom surface of the bottom plate of the bearing fixing bracket (6a) to be fixed on the sensor support ring (3); Alternatively, the damping structure includes a bullseye wheel (6i), an upper fixed bracket (6e), a second damping spring assembly (6f), and a lower fixed bracket (6g); wherein, the upper fixed bracket (6e) is composed of a first vertical plate and a cross-shaped boss protruding from one side of the first vertical plate, dividing the four apex corners of the side plate into four spring mounting slots; the lower fixed bracket (6g) is composed of a second vertical plate and two connecting plates (6h) symmetrically fixed to the bottom surface of the second vertical plate, and the second vertical plate is parallel to the first vertical plate and spaced apart; the second damping spring assembly (6f) is composed of four damping springs, which are respectively installed in the four spring mounting slots of the upper fixed bracket (6e), and their two ends are respectively fixed to the opposite side plates of the first and second vertical plates; the bullseye wheel (6i) is centrally fixed to the other side plate of the upper fixed bracket (6e).

2. The pipeline inspection device according to claim 1, characterized in that, The second transmission mechanism (5) includes two vertical synchronous belts (5a), two synchronous pulley frames (5b), a first synchronous pulley (5c), a drive device, a transverse synchronous belt (5e), ​​a double synchronous pulley (5f), and two second synchronous pulleys (5g); wherein, the two synchronous pulley frames (5b) are symmetrically arranged on both sides of the first fixed support ring (1), and the top end of each synchronous pulley frame (5b) is fixed on the first fixed support ring (1), and the bottom end is located below the lead screw (2b) on the same side; the first synchronous pulley (5c) and the double synchronous pulley (5f) are rotatably fixed to the two synchronous pulley frames (5b). The bottom end of the first synchronous pulley (5c) is connected to the second synchronous pulley (5g) by a transverse synchronous belt (5e) to form a belt drive; the drive device is installed in the center hole of the first synchronous pulley (5c) to drive the first synchronous pulley (5c) to rotate; the two second synchronous pulleys (5g) are respectively fixed to the ends of the two lead screws (2b) to drive the two lead screws (2b) to rotate synchronously, and the two are connected to each other by a vertical synchronous belt (5a) to form a belt drive; the double synchronous pulley (5f) and the second synchronous pulley (5g) located on the same side are connected to each other by another vertical synchronous belt (5a) to form a belt drive; wherein, the drive device is a handwheel, a manual crank, or a motor.

3. The pipeline inspection device according to claim 1, characterized in that, Multiple through slots are evenly distributed along the circumference on one side plate of the annular body. Multiple pairs of through holes are opened at intervals from the inner circumferential surface of the arc-shaped fixing plate to its outer circumferential surface. A pair of fixing holes are opened on the pad, so that it can be detachably fixed in any pair of through holes of the through slot by two matching bolts, so as to adjust the distance of the pad protruding from the inner circumferential surface of the annular body.

4. The pipeline inspection device according to claim 1, characterized in that, Two handles are symmetrically installed on the outer edge of the upper part of the annular body of the first fixed support ring (1) and the second fixed support ring (7).

5. The pipeline inspection device according to claim 1, characterized in that, Two sets of buffer pads are symmetrically arranged at the top and bottom of the annular inner plate surface of the first fixed support ring (1) and the second fixed support ring (7); the buffer pads are circular rubber pads with a thickness of 3~5mm.

6. The pipeline inspection device according to claim 1, characterized in that, The annular body (1a) is formed by connecting four arc-shaped fixed plates, which are divided into four equal parts, end to end. Two arc-shaped fixed plates are connected and fixed together by a fixed plate connector (1e) to form a left fixed half-ring. The other two arc-shaped fixed plates are connected and fixed together by another fixed plate connector (1e) to form a right fixed half-ring. The upper connecting ends of the left and right fixed half-rings are symmetrically fixed on both sides of a track connector (1f), and the lower connecting ends are symmetrically fixed on both sides of another track connector (1f). The left supporting semi-circular ring (3a) and the right supporting semi-circular ring (3b) are both composed of two arc-shaped support plates, and the two arc-shaped support plates are connected and fixed together by bolts through a support plate connector (3d) to form a semi-ring. The upper and lower connecting ends of the left supporting semi-circular ring (3a) and the right supporting semi-circular ring (3b) are connected by two second supporting connectors (3f).

7. The pipeline inspection device according to claim 6, characterized in that, The track connector (1f) consists of two split vertical plates, and the strip plate (4a) consists of two split strip plates. Each vertical plate is detachably fixed to the end of the supporting semi-circular ring and the strip plate on the same side. Two positioning posts are symmetrically arranged on the mating surface of one strip plate, and two positioning grooves are symmetrically arranged on the mating surface of the other strip plate, so that the two strip plates can be neatly mated by assembling the two positioning posts of one strip plate into the two positioning grooves respectively.

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