Polyethylene pipeline joint defect detection system

Abstract

The utility model relates to a polyethylene pipeline joint defect detection system which comprises a signal processing workstation, a radio frequency signal analyzer, a motion control device, a scanning frame and an antenna probe, the signal processing workstation is electrically connected with the radio frequency signal analyzer and the motion control device; the scanning frame comprises a pipeline surrounding assembly and an axial moving platform, the pipeline surrounding assembly is arranged on the outer surface of a pipeline in a sleeving mode, and the axial moving platform is installed on the pipeline surrounding assembly; the antenna probe is installed on the axial moving platform, located on one side of the surface of the pipeline and electrically connected with the radio frequency signal analyzer. Compared with the prior art, the device has the advantages that the scanning frame can move in the axial direction and the circumferential direction of the polyethylene pipeline through the pipeline surrounding assembly and the axial moving platform; and the antenna probe is driven by the scanning rack to comprehensively detect the polyethylene pipeline, and is matched with the signal processing workstation, the radio frequency signal analyzer and the motion control device to realize signal processing and analysis.

Description

TECHNICAL FIELD

[0001] The utility model relates to microwave nondestructive testing technology especially to a polyethylene pipeline joint defect detection system. BACKGROUND

[0002] With the development of polymer material technology, polyethylene material pipelines are more and more widely applied in gas delivery, water supply and drainage, petrochemical industry and other fields due to low cost, corrosion resistance, high body strength and other advantages. However, the welding joint area is more prone to defects due to the influence of welding method and welder level. Especially in the field installation welding process, the welding quality is difficult to guarantee due to the influence of construction period, external working environment and other factors. Therefore, timely and effective detection of the polyethylene pipeline welding joint area is the difficulty of current research.

[0003] Conventional nondestructive testing methods are mostly proposed and developed for the body corrosion defects or welding joint defects of metal pipelines. At present, there is no mature and effective detection method for polyethylene pipeline welding joint defects. The ray detection method has ionizing radiation risk. Moreover, it is sensitive to volume defects such as inclusions and holes, but its detection effect is poor when applied to common process defects such as overwelding and cold welding. The ultrasonic detection method is limited by its penetration ability in polyethylene material, and can only detect surface or near-surface defects. As a kind of electromagnetic wave, microwave has small energy loss and high penetration depth when propagating in non-metallic materials. Therefore, it is suitable for polyethylene pipeline defect detection. The current polyethylene pipeline microwave detection methods include reflection method, transmission method and resonance method, and the reflection method is the most widely used. The detection system in the prior art can only move along the pipeline axis direction when detecting by the reflection method, and cannot realize the detection of the pipeline circumferential direction.

[0004] Therefore, how to design a detection system capable of detecting the pipeline comprehensively is a technical problem to be solved. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the defect that the existing technology cannot comprehensively detect the pipeline and provides a polyethylene pipeline joint defect detection system.

[0006] The utility model can realize the purpose by the following technical scheme.

[0007] According to one aspect of the utility model, a kind of polyethylene pipeline joint defect detection system is provided, including signal processing workstation, radio frequency signal analyzer, motion control device, scanning frame and antenna probe;The signal processing workstation is electrically connected with radio frequency signal analyzer and motion control device;The scanning frame is located on the surface of pipeline, and the scanning frame includes pipeline surrounding assembly and axial movement platform, the pipeline surrounding assembly is set on the outer surface of pipeline, and forms rotating pair with pipeline, and the axial movement platform is installed on the pipeline surrounding assembly;The antenna probe is installed on the axial movement platform, located on the side of pipeline surface, and the antenna probe is electrically connected with radio frequency signal analyzer.

[0008] As preferred technical scheme, the axial movement platform extension direction is the pipeline axis extension direction, and the axial movement platform includes support platform, guide rail, movable platform, screw rod and antenna clamp, the support platform is installed on the pipeline surrounding assembly;The guide rail is installed on the support platform;The movable platform side is provided with guide groove matched with guide rail, and the other side is installed antenna clamp;The screw rod is installed at both ends of support platform, and passes through movable platform;The antenna clamp clamps antenna probe.

[0009] As preferred technical scheme, the motion control device includes motor driver and stepping motor, and the motor driver is electrically connected with signal processing workstation and stepping motor;The output shaft of the stepping motor is connected with the screw rod of axial movement platform.

[0010] As preferred technical scheme, the antenna clamp includes probe vertical direction fixed plate, probe horizontal direction fixed plate and probe clamp, one side of the vertical direction fixed plate is connected on movable platform, and the probe horizontal direction fixed plate is connected with probe vertical direction fixed plate perpendicularly;The first recess is provided on the probe clamp, and the antenna probe is installed in the first recess and matched with the first recess, and the probe clamp is arranged on the horizontal direction fixed plate.

[0011] As preferred technical scheme, the vertical direction fixed plate of probe is provided with straight slot, and the probe horizontal direction fixed plate is fixed on the vertical direction fixed plate of probe through straight slot;Second recess and multiple groups of parallel fixing holes are provided on the probe horizontal direction fixed plate, the antenna probe passes through the second recess, and the probe clamp is installed on the probe horizontal direction fixed plate through a group of fixing holes.

[0012] As preferred technical scheme, the pipeline surrounding assembly includes circumferential surrounding belt and connecting piece;The circumferential surrounding belt includes multiple circumferential links connected in sequence, the circumferential link is arc-shaped, one end is U-shaped, and is provided with first mounting hole;The other end is I-shaped, and is provided with second mounting hole;The connecting piece connects two circumferential links by passing through the first mounting hole of one circumferential link and the second mounting hole of another circumferential link.

[0013] As a preferred technical solution, the second mounting hole is an arc-shaped notch.

[0014] As a preferred technical solution, the second mounting hole is provided with an opening near one side of the first mounting hole, and the diameter of the opening is greater than the diameter of the connecting piece.

[0015] As a preferred technical solution, the pipeline surrounding assembly further comprises a wheel; and the axial movement platform comprises a support platform, which extends in the axial direction of the pipeline and is installed at one end on the circumferential surrounding belt and at the other end on the wheel.

[0016] As a preferred technical solution, the support platform comprises a panel and a support assembly, the support assembly comprises a support plate, one end of the support plate is installed on the wheel, and the support plate is provided with a straight notch, and the panel is fixed on the support plate through the straight notch.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1) The scanning frame of the utility model realizes axial and circumferential movement along the polyethylene pipeline through the pipeline surrounding assembly and the axial movement platform; the antenna probe is driven by the scanning frame to comprehensively detect the polyethylene pipeline, and the signal processing workstation, the radio frequency signal analyzer and the motion control device are matched to realize signal processing and analysis;

[0019] 2) The axial movement platform of the utility model realizes translational movement through a lead screw, and a guide rail is arranged to make the movement more stable; the lead screw is driven by a stepping motor, the movement is more accurate, and the pipeline defect position is more accurate;

[0020] 3) The probe horizontal direction fixing plate of the utility model is height-adjustable, can be used for controlling the distance between the antenna probe and the pipeline, a plurality of parallel fixing holes are arranged on the probe horizontal direction fixing plate, can be used for adjusting the position of the antenna probe, so that the center of gravity of the antenna probe and the antenna clamp is in the same plane as the pipeline center; the shape of the probe clamp groove can be adjusted according to different types of antenna probes;

[0021] 4) The circumferential surrounding belt of the utility model comprises a plurality of circumferential links connected in sequence and is suitable for pipelines with different diameters; the wheel supports the axial movement platform and facilitates driving the axial movement platform to move along the pipeline circumferentially. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic view of the polyethylene pipeline joint defect detection system of the utility model;

[0023] Figure 2 It is a schematic view of the overall structure of the scanning frame of the utility model except the circumferential surrounding belt.

[0024] Figure 3 It is axial movement platform structure schematic view of the utility model;

[0025] Figure 4 It is probe vertical direction fixed plate structure schematic view of the utility model;

[0026] Figure 5 It is probe horizontal direction fixed plate structure schematic view of the utility model;

[0027] Figure 6 It is circumferential chain link main view of the utility model;

[0028] Figure 7 It is circumferential chain link plan view of the utility model;

[0029] Figure 8 It is horn probe fixture structure schematic view of the utility model;

[0030] Figure 9 It is waveguide probe fixture structure schematic view of the utility model;

[0031] Figure 10 It is the effect drawing of the utility model installed on the pipeline;

[0032] The figure mark shows:

[0033] 1, signal processing workstation, 2, radio frequency signal analyzer, 31, motor driver, 32, stepper motor, 4, scanning frame, 411, circumferential ring belt, 4111, circumferential chain link, 41111, first mounting hole, 41112, second mounting hole, 412, wheel, 421, support platform, 4211, panel, 4212, support plate, 422, guide rail, 423, moving platform, 424, screw rod, 425, antenna clamp, 4251, probe vertical direction fixed plate, 4252, probe horizontal direction fixed plate, 4253, probe fixture, 5, antenna probe. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work should belong to the protection scope of the utility model.

[0035] The utility model discloses adopt the reflection method, utilize the reflection method measurement pipeline defect, need place antenna probe 5 in the above of detection position, receive microwave reflection signal.

[0036] As Figure 1 The utility model discloses a polyethylene pipeline joint defect detection system, including signal processing workstation 1, radio frequency signal analyzer 2, motion control device, scanning frame 4 and antenna probe 5, the column shown in the drawing is the pipeline, and the area shown in the dotted line on the pipeline is the welding joint area. Figure 10 As

[0037] Signal processing workstation 1 with radio frequency signal analyzer 2 and motion control device electrical connection, complete defect condition's display and signal's operation processing.

[0038] Radio frequency signal analyzer 2 with antenna probe 5 electrical connection, complete antenna probe 5 echo's data preprocessing.

[0039] Motion control device complete scanning frame 4 on probe fixture's step drive, to drive antenna probe 5 moves, including motor driver 31 and step motor 32, motor driver 31 with signal processing workstation 1 electrical connection, receive instruction and drive step motor 32's rotation, step motor 32's output shaft connects scanning frame 4's axial movement platform 423, drive axial movement platform 423 moves.Step motor 32's movement is more accurate, can realize antenna probe 5's millimeter level step motion control, therefore can make the defect position that detection system detects more accurate, satisfy polyethylene pipeline defect detection in high resolution microwave scanning imaging's demand.

[0040] Scanning frame 4 includes pipeline ring assembly and axial movement platform 423.

[0041] The pipeline surrounding assembly comprises a circumferential surrounding belt 411, a wheel 412 and a connecting piece. The circumferential surrounding belt 411 is sleeved on the outer surface of the pipeline to form a rotating pair with the pipeline, and comprises a plurality of circumferential links 4111 connected in sequence. The circumferential links 4111 are arc-shaped, one end of each circumferential link 4111 is U-shaped and provided with a first mounting hole 41111, and the other end of each circumferential link 4111 is I-shaped and provided with a second mounting hole 41112. The connecting piece passes through the first mounting hole 41111 of one circumferential link 4111 and the second mounting hole 41112 of another circumferential link 4111 to connect the two circumferential links 4111. The connecting piece can be a steel pipe. In order to adapt to the arc-shaped circumferential links 4111 and facilitate adjustment, the second mounting hole 41112 is an arc-shaped notch. An opening is arranged on the side of the second mounting hole 41112 close to the first mounting hole 41111, and the diameter of the opening is greater than the diameter of the connecting piece. After the two ends of the steel pipe are mounted in the two first mounting holes 41111 of one circumferential link 4111, the middle part of the steel pipe passes through the opening of another circumferential link 4111 to reach the second mounting hole 41112, and the two circumferential links 4111 are connected. Compared with directly inserting the steel pipe into the first mounting hole 41111 and the second mounting hole 41112, the operation steps are greatly simplified, and the installation is convenient. The circumferential surrounding belt 411 is connected to one end of the support platform 421, and the wheel 412 is connected to the other end of the support platform 421. The circumferential surrounding belt 411 and the wheel 412 support the two ends of the support platform 421. The arrangement of the wheel 412 makes the movement of the axial movement platform 423 along the circumferential direction more smooth.

[0042] The axial movement platform 423 extends in the pipeline axis direction and comprises the support platform 421, the guide rail 422, the movable platform 423, the lead screw 424, the antenna clamp 425 and the infrared limit switch. The support platform 421, the guide rail 422 and the lead screw 424 all extend in the pipeline axis direction, and the movable platform 423 moves along the pipeline axis direction.

[0043] The support platform 421 comprises a panel 4211 and a support assembly. The support assembly comprises a support plate 4212 and a support block. The support plate 4212 is provided with a straight notch, one end of the support plate 4212 is mounted on the wheel 412, one end of the support block is mounted on the circumferential surrounding belt 411, one end of the panel 4211 is fixed on the support plate 4212 through the straight notch, and the other end of the panel 4211 is arranged on the support block. The height of the panel 4211 fixed on one end of the straight notch is adjustable.

[0044] The guide rail 422 is mounted on the support platform 421.

[0045] The movable platform 423 is provided with a guide groove on one side. The shape of the guide groove is the same as that of the guide rail 422. The guide groove and the guide rail 422 cooperate to make the movement of the movable platform 423 more stable. The antenna clamp 425 is mounted on the other side of the movable platform 423.

[0046] The screw rod 424 is arranged at two ends of the support platform 421, and one end is connected with the output shaft of the stepping motor 32; the screw rod 424 penetrates through the movable platform 423, and the movable platform 423 is provided with a thread matched with the screw rod 424; when the stepping motor 32 drives the screw rod 424 to rotate, the movable platform 423 moves.

[0047] The antenna clamp 425 comprises a probe vertical direction fixing plate 4251, a probe horizontal direction fixing plate 4252 and a probe clamp 4253; one side of the probe vertical direction fixing plate 4251 is connected with one side of the movable platform 423, and a straight slot is arranged on the probe vertical direction fixing plate 4251; the probe horizontal direction fixing plate 4252 is fixed on the probe vertical direction fixing plate 4251 through the straight slot, so that the height of the probe horizontal direction fixing plate 4252 can be adjusted, and the height of the antenna probe 5 can be adjusted according to the height of the probe horizontal direction fixing plate 4252, so as to meet the requirement of the lifting distance of the antenna probe 5 during microwave scanning; the probe horizontal direction fixing plate 4252 is provided with a second groove and a plurality of parallel fixing holes; the probe clamp 4253 is installed on the probe horizontal direction fixing plate 4252 through a group of fixing holes and clamps one end of the antenna probe 5; the probe clamp 4253 is installed in different groups of fixing holes, so that the gravity center of the antenna probe 5 and the antenna clamp 425 and the center of the pipeline are in the same plane, so as to be suitable for different types and different sizes of the antenna probe 5, guarantee the stability of the antenna probe 5 and the antenna clamp 425 as a whole, the probe clamp 4253 is provided with a first groove, the antenna probe 5 is installed in the first groove and matched with the first groove, the shape of the first groove can be adjusted according to the type of the antenna probe 5, and the antenna probe 5 penetrates through the second groove. Figure 8 and Figure 9 As shown in the figures, according to the appearance shape of different types of antennas, special antenna clamps are designed, so that the antenna probe 5 can move stably and reliably on the scanning platform.

[0048] The antenna probe 5 is installed on the axial movable platform 423 and located at one side of the pipeline surface with a certain distance from the pipeline surface, and completes the emission and reception of the radio frequency microwave signal; the signal can be emitted to the pipeline surface through the antenna probe 5, and the echo can be returned to the radio frequency signal analyzer 2 through the antenna probe 5 and the coaxial cable, so as to obtain the echo S parameter information of each detection position; the amplitude and phase information of the echo S parameter is transmitted to the signal processing workstation 1 through the LAN network transmission line; the signal processing workstation 1 can combine the antenna position information fed back by the motion control device to synthesize the data of different scanning points into a two-dimensional pipeline image, so as to realize the two-dimensional scanning imaging function of the pipeline defects.

[0049] The infrared limit switch is installed at two ends of the support platform 421, and when the movable platform 423 moves, the infrared limit switch can prevent the movable platform 423 from exceeding the range of the guide rail 422 and causing mechanical damage.

[0050] The working process of the utility model is as follows:

[0051] First, the antenna probe 5 is fixed on the antenna clamp 425 moving platform through the probe vertical direction fixing plate 4251, the probe horizontal direction fixing plate 4252 and the probe clamp 4253.Secondly, the moving platform is driven to move along the pipeline axial slide rail by the motion control device, and the circumferential ring 411 can rotate along the pipeline circumference.Through the two-dimensional motion of the antenna probe 5 in the axial and circumferential directions, the pipeline echo at different points can be obtained.When the echo is received by the antenna probe 5, and after being preprocessed by the radio frequency signal analyzer 2 and calculated by the signal processing workstation 1, a two-dimensional image of the pipeline detection area can be formed.

[0052] The utility model discloses can realize the point -by -point scanning of pipeline detection area through the artificial rotation movement of pipeline circumference and the motor control step -by -step reciprocating motion of pipeline axial, and through the point -by -point imaging display mode, obtain the high resolution image of pipeline detection area.

[0053] The above is only the specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, and anyone skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the utility model, and these modifications or replacements should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be the protection scope of the claims.

Claims

1. A polyethylene pipe joint defect detection system, characterized by, The utility model relates to a kind of pipeline inspection systems, including signal processing workstation (1), radio frequency signal analyzer (2), motion control device, scanning frame (4) and antenna probe (5);Signal processing workstation (1) is electrically connected with radio frequency signal analyzer (2) and motion control device;The scanning frame (4) is located pipeline surface, and the scanning frame (4) includes pipeline surrounding assembly and axial movement platform (423), the pipeline surrounding assembly is set on the outer surface of pipeline, and forms rotary pair with pipeline, and the axial movement platform (423) is installed on pipeline surrounding assembly;The antenna probe (5) is installed on axial movement platform (423), and is located pipeline surface one side, and the antenna probe (5) is electrically connected with radio frequency signal analyzer (2); The pipeline surrounding assembly includes circumferential surrounding belt (411) and connecting piece;The circumferential surrounding belt (411) includes a plurality of circumferential links (4111) connected in sequence, the circumferential link (4111) is arc-shaped, one end is U-shaped, and is provided with a first mounting hole (41111);The other end is I-shaped, and is provided with a second mounting hole (41112);The connecting piece passes through the first mounting hole (41111) of one circumferential link (4111) and the second mounting hole (41112) of another circumferential link (4111) to connect two circumferential links (4111).

2. A polyethylene pipe joint defect detection system according to claim 1, wherein, The axial movement platform (423) extends in the direction of pipeline axis, and the axial movement platform (423) includes support platform (421), guide rail (422), movable platform (423), screw rod (424) and antenna clamp (425), the support platform (421) is installed on pipeline surrounding assembly;The guide rail (422) is installed on support platform (421);The movable platform (423) is provided with guide groove matched with guide rail (422) on one side, and antenna clamp (425) is installed on the other side;The screw rod (424) is installed at both ends of support platform (421) and passes through movable platform (423);The antenna clamp (425) clamps antenna probe (5).

3. A polyethylene pipe joint defect detection system according to claim 2, wherein, The motion control device includes motor driver (31) and stepping motor (32), the motor driver (31) is electrically connected with signal processing workstation (1) and stepping motor (32);The output shaft of the stepping motor (32) is connected with the screw rod (424) of axial movement platform (423).

4. A polyethylene pipe joint defect detection system according to claim 2, wherein, The antenna clamp (425) includes probe vertical direction fixed plate (4251), probe horizontal direction fixed plate (4252) and probe clamp (4253), one side of the vertical direction fixed plate is connected on movable platform (423), the probe horizontal direction fixed plate (4252) is connected with probe vertical direction fixed plate (4251) perpendicularly;The first groove is arranged on the probe clamp (4253), and the antenna probe (5) is installed in the first groove and matched with the first groove, and the probe clamp (4253) is erected on horizontal direction fixed plate.

5. A polyethylene pipe joint defect detection system according to claim 4, wherein, The probe vertical direction fixing plate (4251) is provided with a straight slot, the probe horizontal direction fixing plate (4252) is fixed on the probe vertical direction fixing plate (4251) through the straight slot, the probe horizontal direction fixing plate (4252) is provided with a second groove and a plurality of parallel fixing holes, the antenna probe (5) passes through the second groove, and the probe clamp (4253) is installed on the probe horizontal direction fixing plate (4252) through a group of fixing holes.

6. The polyethylene pipe joint defect detection system of claim 1, wherein, The second mounting hole (41112) is an arc-shaped slot.

7. A polyethylene pipe joint defect detection system according to claim 1 or 6, characterized in that, The second mounting hole (41112) is provided with an opening near one side of the first mounting hole (41111), and the diameter of the opening is greater than the diameter of the connecting piece.

8. The polyethylene pipe joint defect detection system of claim 1, wherein, The pipeline surrounding assembly further comprises a wheel (412), and the axial movement platform (423) comprises a support platform (421), wherein the support platform (421) extends along the pipeline axis, one end of the support platform (421) is installed on the circumferential surrounding belt (411), and the other end of the support platform (421) is installed on the wheel (412).

9. A polyethylene pipe joint defect detection system according to claim 8, wherein, The support platform (421) comprises a panel (4211) and a support assembly, the support assembly comprises a support plate (4212), one end of the support plate (4212) is installed on the wheel (412), the support plate (4212) is provided with a straight slot, and the panel (4211) is fixed on the support plate (4212) through the straight slot.

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