CN201016966Y - Manual scanner for spiral weld joint - Google Patents

Abstract

The utility model discloses a manual scanner of spiral weld that is used for phased array to combine TOFD ultrasonic detection to walk on the pipeline when labour steel pipeline spiral weld. To the field of testing and plumbing systems for equipment not otherwise provided for. The scanning device mainly comprises a scanning frame [1], a probe frame [6], rolling wheel mechanisms and an encoder mechanism, wherein the rolling wheel mechanisms are arranged at four corners of the rectangular scanning frame [1], the probe frame [6] is arranged on probe frame moving tracks [4] at two sides of the scanning frame [1], and the encoder mechanism is arranged at one side outside the scanning frame [1 ]. The scanner can stably and reliably walk on the pipeline when detecting the spiral weld of the steel pipeline in service, the position of the probe can be always accurately parallel to the surface of the weld of the pipeline and a certain distance is ensured, and the manual scanner which can reliably and accurately detect the spiral weld of the steel pipeline in service is provided for phased array combined TOFD ultrasonic detection.

Description

Spiral Weld Manual Scanner

technical field

The utility model is a spiral welding seam manual scanner for walking on the pipeline when the phased array combined with TOFD ultrasonic wave detects the spiral welding seam of the steel pipeline in service. The technical field of testing and piping systems involving equipment not covered by other classes.

Background technique

The spiral weld manual scanner is a mechanical device for walking on the pipeline when the phased array combined with TOFD ultrasonic detects the spiral weld of the steel pipeline in service. The phased array probe and the TOFD probe are respectively installed on the probe frame of the scanner In addition, the center distance between the phased array probe and the TOFD probe can be adjusted, and the probe can be pressed tightly on the metal surface, free to install and disassemble. The scanner is free to walk along the direction parallel to the weld for flaw detection and scanning, and an encoder is installed on the scanner to record the scanning distance. Spiral welded steel pipes will be inspected by non-destructive testing for spiral welds before leaving the factory. An automatic ultrasonic flaw detection system for spiral welded steel pipe weld seam detection has been designed in China, which is used for non-destructive inspection of the spiral weld seam of steel pipes before leaving the factory. Its main feature is that the detection equipment is fixed, and the welded pipe rotates to obtain the detection results. However, for in-service spiral welded steel pipes, mainly in-service spiral welded steel pipes that have been in operation for many years, the spiral welds may be damaged or defective due to various reasons, so the spiral welds must be inspected by non-destructive testing during pipeline overhaul. So far, there is no scanner specifically for on-site spiral weld inspection of spiral welded steel pipes. Most foreign countries use straight seam pipes, so there is no scanner for on-site spiral weld inspection.

Utility model content

The purpose of the utility model is to design a phased array combined with TOFD ultrasonic wave to detect the spiral weld seam of the steel pipeline in service, which can walk on the pipe stably and accurately and manually scan the spiral seam.

The scanner is used to maintain a fixed distance between the incident points of the two probes and keep them aligned. The additional role of the scanner is to provide probe position information to the ultrasonic flaw detector so that a position-related D-scan or B-scan image can be generated. The probe position information can be provided by a stepping magnetic encoder or an optical encoder or a potentiometer.

There are two scanning methods commonly used in the TOFD method, X and Y. The former is called D-scan and the latter is called B-scan.

D-scan takes the axis of the weld as the center, and a pair of longitudinal wave oblique probes are arranged opposite to each other on both sides of the weld to make parallel scans along the axis of the weld (that is, X-direction scan). When there are internal defects in the weld, according to the diffraction wave signals generated at the upper and lower ends of the defects, the defects can be detected and the defects can be quantitatively tested (depth measurement and height determination).

B-scan is to scan the two probes in the direction perpendicular to the axis of the weld (Y-direction scan). For the defect detected by D-scan, to confirm its position on the cross-section of the weld, it is necessary to use B-scan to accurately measure the position of the upper and lower ends of the defect, and determine the degree of defect inclination according to the deviation between the upper and lower ends from the centerline of the distance between the two probes , to infer the type of defect.

The combination of phased array and TOFD ultrasonic detection requires the two probes to have strict poses, so strict requirements are put forward for the scanner.

In view of this, the technical scheme of the present utility model is shown in Fig. 1, Fig. 2, Fig. 3, and it is mainly made up of scanning frame 1, probe frame 6, rolling wheel mechanism and encoder mechanism, and the four corners of rectangular scanning frame 1 are installed There is a rolling wheel mechanism, the probe frame 6 is installed on the probe frame moving track 4 on both sides of the scanning frame 1, and the encoder mechanism is installed on the outer side of the scanning frame 1.

The scanning frame 1 is mainly composed of the scanning frame support arm 22, the probe frame moving track 4, and the locking handle 3. The two scanning frame support arms 22 are hingedly connected, and there is a locking handle 3 at one end of the hinge shaft, so that the two groups of hinges are connected. The scanning frame support arms 22 constitute the two opposite sides of the scanning frame 1, and the other two opposite sides are the probe frame moving tracks 4, the ends of the two probe frame moving tracks 4 and the four scanning frame support arms 22 outer ends The nuts 10 and 11 are fixedly connected to form a rectangle.

Among them, the shape of the scanning frame support arm 22 is shown in Figure 19, Figure 20, and Figure 21. One end of the "L" shaped scanning frame support arm 22 is a "∏" shaped fork with a shaft hole, and the other end has a hinge hole. And four holes around it, there are five holes connecting the probe frame moving track 4 at the root. The probe frame moving track 4 is a rectangular bar with a chute.

The probe frame 6 (see Figure 12 and Figure 13) is mainly composed of a probe frame fixed top base 15, a probe frame fixed base 17, a probe frame slide rail 16, a probe frame coupling rod 18, a probe frame pressure rod 19, a spring 20, and a coupler 21 It consists of a probe frame slide rail 16 that connects the probe frame fixed top base 15 with the probe frame fixed base 17, the coupler 21 is set outside the probe frame slide rail 16, and a spring 20 connects the probe frame fixed top base 15 with the coupler 21 Connect, the fixed top seat 15 (seeing Fig. 15, Fig. 16) of probe frame is " T " shape piece, respectively has a hole on both sides of upper transverse section, and wherein a hole fixed spring 20 usefulness, vertical section also has a hole. Probe frame fixed base 17 (seeing Fig. 17, Fig. 18) is inverted " T " shape part, respectively has a gap on both sides of its transverse section, and vertical section has two holes. The shape of the probe frame slide rail 16 is as shown in Figure 14, which is a rectangular bar with a chute. The bottom of the probe frame fixing base 17 is connected to the probe frame pressing bar 19 by the probe frame connecting rod 18, and the probe is fixed on the probe frame pressing bar 19.

The rolling wheel mechanism is four magnetic wheels 2 installed at the four corners of the scanning frame 1, and the magnetic wheels 2 (see Fig. 5, Fig. 6, Fig. 7, and Fig. 8) are a plurality of magnetic wheel pieces separated by non-magnetic wheel pieces set on the magnetic wheel core 12, and the two outer sides of the magnetic wheel 2 are magnetic wheel sheets, and they are fixedly connected to the magnetic wheel 2 by 2-3 magnetic wheel mounting screws 13, and a rolling bearing 14 is respectively installed at the two ends of the magnetic wheel core 12, and the shaft passes through Two rolling bearings 14 are installed in the "∏" shape forks of the scanning frame support arms 22 at the four corners of the scanning frame 1. The non-magnetic wheels are made of non-magnetic materials, such as metal materials such as copper and aluminum, or non-metallic organic materials.

The encoder mechanism is composed of an encoder 8 and an encoder moving guide rail 7. As shown in Figure 1 and Figure 2, the encoder moving guide rail 7 is fixedly connected to the outside of one side of the scanning frame 1, and the encoder 8 is installed on the encoder moving guide rail 7 superior.

A couplant dispenser 9 is installed on the scanner for distributing the couplant. Its composition is as shown in Figure 22, because it is a conventional device, so it will not be described in detail.

In order to lighten the operator's burden and not affect the normal rolling of the magnetic wheel 2, the scanning frame 1, the probe frame 6, the rolling wheel mechanism and the encoder mechanism (except for the magnetic wheel 2) are all made of aluminum alloy.

The scanner uses four magnetic wheels 2 to walk on the steel pipeline, so that the scanner can be firmly adsorbed on the pipeline.

To accommodate the ability to work on a variety of pipe diameters, the scanner's front and rear track can be changed. This is because the scanning frame 1 is a frame body that can be folded with the middle of two opposite sides as the axis, that is, the two hinge shafts on a line of the four scanning frame arms 22 are folded as the rotating shaft, so that it can be folded according to the The pipe diameter of the pipe to be inspected is adjusted by four magnetic wheels 2 to keep the probe on the same plane, and the probe is close to the surface of the pipe to be inspected to ensure the quality of the scan.

In order to enable the scanner to accurately scan along the spiral weld, the position of the probe is always parallel to the surface of the pipe weld and a certain distance is guaranteed. The sliding on the top keeps the probe automatically advancing with the helical weld;

This scanner designs an ultrasonic phased array probe scanner with three degrees of freedom, establishes the positional relationship between the scanner and the spiral weld, and gives the phased array probe, TOFD probe and pipeline spiral The positional relationship between the weld and the scanner base.

This manual scanner for girth weld is used as a mechanical device for walking on the pipeline when phased array combined with TOFD ultrasonic detects the girth weld of in-service steel pipelines. The phased array probe and TOFD probe are respectively installed on the scanner. On the probe holder, the center distance between the phased array probe and the TOFD probe can be adjusted, and the probe can be pressed tightly on the metal surface, free to install and disassemble. The scanner is free to walk along the direction parallel to the weld for flaw detection and scanning, and an encoder is installed on the scanner to record the scanning distance.

It can be seen from the above that this scanner is a phased array combined with TOFD ultrasonic inspection. When the spiral weld of the steel pipeline in service is detected, it walks stably and reliably on the pipeline. The position of the probe can always be accurately parallel to the surface of the pipeline weld and ensure a certain The spacing provides a reliable and accurate manual scanner for phased array combined with TOFD ultrasonic testing of spiral welds of in-service steel pipelines.

Description of drawings

Figure 1 Scanner composition front view

Figure 2 Top view of the scanner configuration

Figure 3 Scanner configuration side view

Figure 4 The location of the scanner handle

Figure 5 Magnetic wheel assembly diagram

Figure 6 Magnetic wheel installation screw shape diagram

Figure 7 Magnetic wheel core shape diagram

Figure 8 Rolling bearing structure diagram

Figure 9 Front view of probe coupling rod

Figure 10 side view of probe coupling rod

Figure 11 Shape diagram of probe pressure rod

Figure 12 Probe rack front view

Figure 13 side view of the probe holder

Figure 14 Shape drawing of the slide rail of the probe holder

Figure 15 The front view of the fixed top seat of the probe holder

Figure 16 side view of the fixed top seat of the probe holder

Figure 17 The front view of the fixed base of the probe holder

Figure 18 Side view of the fixed base of the probe holder

Figure 19 Front view of the arm of the scanning frame

Figure 20 Side view of the arm of the scanning stand

Figure 21 Top view of the arm of the scanning frame

Figure 22 Couplant dispenser diagram

1-Scan frame 2-Magnetic wheel

3-Locking handle 4-Probe frame moving track

5-Probe frame slide rail 6-Probe frame

7-encoder moving rail 8-encoder

9-couplant dispenser 10-nut

11-Nut 12-Magnetic wheel core

13-Magnetic wheel mounting screw 14-Rolling bearing

15-Probe rack fixed top seat 16-Probe rack slide rail

17-Probe frame fixed base 18-Probe frame coupling rod

19-Probe rack pressure rod 20-Spring

21-Coupler           22-Scanning frame arm

Detailed ways

Embodiment. This example is used to illustrate the specific implementation of the utility model and to further illustrate the utility model. This example is an experimental prototype, and its composition is shown in Figure 1, Figure 2, and Figure 3. In this example, the Ominiscan32/128PR ultrasonic phased array system is used to carry out the detection test of the welding seam and base metal of the in-service pipeline. In order to improve the detection efficiency and defect detection rate, a set of targeted scanning devices are required as auxiliary detection equipment , so that the weld flaw detection can complete the single-sided and double-sided inspection of the weld at the same time, and the data collection must be complete.

The scanner is used to detect the Φ720mm pipeline of the Northeast Pipeline Network. It can not only walk on the steel pipeline, but also take into account the detection of other pipe diameters. The minimum applicable pipe diameter is Φ426mm, and the maximum applicable pipe diameter is Φ1016mm. The moving range is 10-200mm; the maximum applicable pipe diameter is Φ1016mm; the moving range of the probe center is 10-200mm; its main dimensions: scanning frame 1 is 405×325×38mm; scanning frame support arm 22 is 180×40×38; The total height of the frame fixed top base 15 is 23mm, the horizontal section height is 6.5mm, the length is 38mm, and the vertical section width is 16mm; the probe frame fixed base 17 has a total height of 52mm; the probe frame slide rail 16 is 10×12×...mm; magnetic wheels 2 The outer diameter is Φ42mm, the inner and outer diameter is Φ20mm, and the thickness is 28mm; the model of nut 10: M5X30; the model of nut 11: M8.

The encoder was supplied by R/D Tech. The electromechanical encoder records the position of the probe scan. The encoder is equipped with a correction system to ensure that the distance recorded on the display is consistent with the position of the surface mark. The recording or marking system should clearly indicate the position of the defect relative to the starting point of scanning, with an error not greater than ±10mm.

Probe frame moving guide rail 4: The probe frame moves longitudinally on the guide rail, so that the probe can be pressed tightly on the surface of the pipeline to be inspected. The moving guide rail 4 of the probe frame is a product of Dalian Hanyi Seiko.

Scanning stand support arm 22: a magnetic wheel 2 is installed on this part, so that the scanner can be attracted to the surface of the pipeline to be inspected. In order to adapt to the inspection of pipes with different diameters, there is a shaft in the middle of each pair of arms, and the angle of the arms can be adjusted to achieve the same curvature as the surface of the pipe to be inspected.

Instructions for use:

The phased array ultrasonic inspection system can provide sufficient inspection data collection capabilities to ensure a comprehensive inspection of the pipeline to be inspected, and can simultaneously complete A-scan, B-scan, and sector scan display. In addition, ultrasonic TOFD testing is required to complete TOFD A-scan display and TOFD B-scan display. The ultrasonic testing system should have the functions of high-speed acquisition of testing data, fast storage, and real-time color imaging. This weld seam scanner can assist phased array ultrasonic testing to complete the detection function.

1. First perform the routine settings of the phased array ultrasonic testing system

2 On-site inspection

2.1 Mark the reference line before installing the scanner, and the scanner scans along the reference line, and the reference line must be parallel to the centerline of the weld;

2.2 Install the scanner with the probe installed and adjusted for reference sensitivity on the surface of the pipeline to be inspected; adjust the position of the probe frame 11 on the probe frame slide rail 16 so that the entire sound beam can cover the entire weld seam, such as using water As a couplant, the coupling water supply pipe is installed on the couplant distributor 9 on the scanner and connected to the probe; when the scanner is installed on the surface of the pipeline to be inspected, the magnetic wheel 2 will be tightly adsorbed on the To inspect the surface of the pipeline, the probe frame 6 will move in the longitudinal direction, relying on the spring 20 on the probe frame 6 to press the probe tightly on the surface of the pipeline to be inspected;

2.3 When there is a difference in the surface acoustic energy loss of the pipeline to be inspected, it must be corrected, and the corrected value is measured by the double-probe method of one sending and one receiving;

2.4 Move the scanner along the reference line, so that the probe completes the scanning of all welds to be inspected, observe whether the inspection data is complete, and timely process and re-inspect the poorly coupled areas.

After a total of 10 kilometers of Φ720mm in-service pipelines have been tested and verified, the scanner is stable and reliable when running on the pipeline, and the position of the probe can always be accurately parallel to the surface of the welded seam of the pipeline and a certain distance is guaranteed. It is a phased array combined with TOFD ultrasonic detection The spiral weld of steel pipelines in service provides a reliable and accurate manual scanner; and the device is light in weight, easy to operate and practical.

Claims (10)

1. A spiral weld manual scanner that walks on the pipeline when phased array combined with TOFD ultrasonic detection is used for the spiral weld of in-service steel pipelines. It is characterized in that it is mainly composed of a scanning frame [1], a probe frame [6] Composed of a rolling wheel mechanism and an encoder mechanism, the four corners of the rectangular scanning frame [1] are equipped with a rolling wheel mechanism, and the probe frame [6] is installed on the moving track [4] of the probe frame on both sides of the scanning frame [1]. , the encoder mechanism is installed on the side outside the scanning frame [1]. 2. The spiral weld manual scanner according to claim 1, characterized in that the scanning frame [1] is mainly composed of the scanning frame support arm [22], the probe frame moving track [4], and the locking handle [3] consists of two scanning frame arms [22] hinged, and a locking handle [3] at one end of the hinge shaft, so that two groups of hinged scanning frame arms [22] form a scanning frame [1] The other two opposite sides are the moving track [4] of the probe frame, the ends of the moving track [4] of the two probe frames and the outer ends of the four scanning frame arms [22] are composed of nuts [10] and Nut [11] is fixedly connected into rectangle. 3. The spiral weld manual scanner according to claim 2, characterized in that the scanning frame support arm [22] is an "L" shaped scanning frame support arm [22] with a shaft hole at one end The "П" shaped fork, the other end has a hinge hole and four holes around it, and the root has five holes connecting the moving track of the probe frame [4]. 4. The spiral weld manual scanner according to claim 1, characterized in that the probe frame [6] consists of a probe frame fixed top seat [15], a probe frame fixed base [17], a probe frame slide rail [ 16], probe frame connecting rod [18], probe frame pressing rod [19], spring [20], coupler [21], the probe frame slide rail [16] fixes the probe frame to the top seat [15] and the probe The fixed base [17] of the probe frame is connected, and the coupler [21] is set outside the slide rail [16] of the probe frame, and there is a spring [20] to connect the fixed top base [15] of the probe frame with the coupler [21], and the probe frame is fixed. The bottom of the base [17] is connected to the probe frame depression bar [19] by the probe frame coupling rod [18], and the probe is fixed on the probe frame depression bar [19]. 5. The spiral welding seam manual scanner according to claim 4, characterized in that the fixed top seat [15] of the probe frame is a "T" shaped piece, and there are holes on both sides of the upper transverse section, one of which is fixed Spring [20] is useful, and vertical section also has a hole. 6. The spiral welding seam manual scanner according to claim 4, characterized in that the fixed base [17] of the probe frame is an inverted "T"-shaped piece with a gap on both sides of the horizontal section and two holes in the vertical section . 7. The spiral welding seam manual scanner according to claim 4, characterized in that the probe frame slide rail [16] is shaped as a rectangular rod with a slide groove. 8. The spiral weld manual scanner according to claim 1, characterized in that the rolling wheel mechanism is four magnetic wheels [2] installed at the four corners of the scanning frame [1], and the magnetic wheels [2] are A plurality of magnetic wheel pieces are spaced by non-magnetic wheel pieces on the magnetic wheel core [12], and the two outer sides of the magnetic wheel [2] are magnetic wheel pieces, and they are fixedly connected by 2-3 magnetic wheel installation screws [13] Become magnetic wheel [2], respectively install a rolling bearing [14] at the two ends of magnetic wheel core [12], the axle passes two rolling bearings [14] and is installed in the scanning frame support arm [22] of scanning frame [1] four corners Inside the "П" shaped fork. 9. The spiral weld manual scanner according to claim 8, characterized in that the non-magnetic wheel is made of copper, aluminum, non-magnetic metal material or non-metallic organic material. 10. The spiral welding seam manual scanner according to claim 1, characterized in that the scanning frame [1], the probe frame [6], and the encoder mechanism are made of copper, aluminum, non-magnetic metal materials or non-metallic materials. made of organic materials.

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