CN100387984C

CN100387984C - Pipe node welding sean ultrasonic detecting machine scanning device

Info

Publication number: CN100387984C
Application number: CNB2004100610969A
Authority: CN
Inventors: 程建政; 宋玉玲; 张旸
Original assignee: Wuhan Institute of Physics and Mathematics of CAS
Current assignee: Wuhan Institute of Physics and Mathematics of CAS
Priority date: 2004-11-12
Filing date: 2004-11-12
Publication date: 2008-05-14
Anticipated expiration: 2024-11-12
Also published as: CN1624470A

Abstract

The present invention discloses a mechanical scanner for a tube section spot welding seam supersonic detector, which is composed of a scanning guide rail, a step motor, a sliding bar, a sliding ring and a positioning ring of a probe. The present invention is characterized in that the scanning guide rail is circularly fixed on a branch tube of a TKY tube; the scanning guide rail is vertical to the axial direction of the branch tube of the TKY tube; the step motor is arranged on the scanning guide rail; the positioning ring of a probe is fixed on the branch tube of the TKY tube; the sliding ring is fixed on the sliding bar to contact the positioning ring of a probe via a rolling ball. The present invention has the advantages of simple structure, convenient operation and accurate measurement results; the equidistant automatic scanning between the probe and the welding seam is realized; the accurate identification and positioning of the echo signals can be guaranteed.

Description

A kind of tubular joint weld Ultrasonic Detection mechanical scanner

Technical field

The present invention relates to Ultrasonic Detection machinery autoscan field, more specifically relate to a kind of tubular joint weld Ultrasonic Detection mechanical scanner.

Background technology

In recent years, deepening continuously and develop along with marine resources development, world many countries is newly-built many marine resources development facilities, wherein mainly contain fixed offshore platform, marine mobile platform and subsea pipeline etc., attack and the corrosion of ocean by soaking of ocean storm owing to often being subjected to for these offshore structures, is prone to crackle at its tubular joint weld place, thereby jeopardizes the safety of national wealth and personnel's life, thereby the Non-Destructive Testing work of offshore platform structure is significant.Offshore platform structure generally is made of various steel jackets, and its pipe node can be divided into three kinds of T, K, Y according to the difference of its structural form.

Existing tubular joint weld ultrasonic testing system, generally the girth joint at long-distance transport pipes detects, and this weld seam is rotational symmetric, when adopting angle probe to detect, only need along the circumferential direction do the detection that one dimension mechanical scanning can be finished butt welded seam.Wherein the most representative, the PipeWIZARD phased array ultrasonic detection system that Canadian R/D Tech company produces is exactly the checkout equipment that is exclusively used in the long-distance transport pipes girth joint.This system is made up of data acquisition unit, pulse generation unit, electric-motor drive unit, phased array probe, industrial computer and display etc.System moves Pipe WIZARD function software under Windows NT interface, finish the linear scanning of butt welded seam, demonstration in real time and result and pass judgment on.This type systematic generally requires wave beam vertical weld length direction when carrying out Ultrasonic Detection, like this, the defect reflection signal of commissure could receive exactly.And for the TKY tubular joint weld, the groove direction and the weld seam of its diverse location constantly change with respect to generatrix direction, and the existing ultrasonic automatic checkout system of commercial tubular joint weld is because all detection needs at girth joint, the central axis of its sound beam direction and measured tube is in same plane, almost can not scan detection to the TKY tubular joint weld.Detect main X-ray examination method or the manual supersonic testing method of adopting at the TKY tubular joint weld at present, still needleless detects the automatic ultrasonic detection system that needs to the TKY tubular joint weld.

Radiological survey X is the important Dynamic Non-Destruction Measurement that weld inspection is extensively adopted, and it is that a kind of X ray that utilizes produces the method that image is checked the metal inside micromechanism to penetrating of metal.As everyone knows, all material all absorbs certain radiation energy, different materials, and owing to density, thickness, different with atomic weight, the absorption difference of its radiation energy, thereby its intensity in transmission is also different.Therefore ray can be used to detect effectively weld seam inherent vice such as pore, sand holes, undercut, lack of penetration, crackle, nonmetal inclusion, burn etc., and weld seam inherent vice image can be observed on video screen or film.It is fast that ray detection has speed, low cost and other advantages, but its image definition is poor, brings difficulty to analyzing defect.For thicker workpiece, also there are problems such as ray can not penetrate.In addition, because ray is harmful, must take effective safety precautions.

In the Ultrasonic Detection of TKY tubular joint weld, because the wall thickness of arm is less, the primary reflection sound path is shorter, and weld defect has more present root and arm side corresponding circle of sensation position in addition, so detect in the arm side usually, the supersonic detection method of TKY tubular joint weld commonly used is manual detection at present.The ultrasonic manual detection of TKY tubular joint weld, because testing result depends on testing staff's experience and technology, the phenomenon that is prone to erroneous judgement and fails to judge, position to each defective place, what need all that the long time carries out the cross section gets shape, mapping and location survey, workload is bigger, all has problems from repeatability and reliability.And for the space three-dimensional curved-surface structure of this complexity of TKY tubular joint weld, manually Ultrasonic Detection can not realize the visual and real time record of testing result.

Summary of the invention

The object of the present invention is to provide the ultrasonic mechanical detection scanister of a kind of TKY tubular joint weld, it is simple in structure, and is easy to operate, and measurement result is accurate, has realized equidistant autoscan between probe and weld seam, and has guaranteed the accurate identification of echoed signal.

In order to realize above-mentioned task, the present invention adopts following technical measures:

At present, along with greatly developing of marine resources development, the safety problem of offshore platform structure more and more is subjected to people's attention.Low at present TKY tubular joint weld welding quality Ultrasonic Detection automaticity, human factor is many, no record, declare problems such as hindering difficulty, the applicant has carried out the research of the automatic ultrasonic scanning-detecting system of offshore platform structure TKY tubular joint weld, and the present invention is the mechanical scanning part of TKY tubular joint weld ultrasonic scanning detection system.

Developed a kind of dependable performance, the ultrasonic automatic checkout system of TKY tubular joint weld that detection efficiency is high, its scanning guide rail is around being fixed on the TKY pipe arm, and to prop up tube axis direction vertical with TKY; Stepper motor is installed on the scanning guide rail, drives sliding bar along the scanning guide rail movement; The probe locating ring is consistent with the curve shape of weld seam, is fixed on the TKY arm; Slip ring is fixed on the sliding bar, and contacts with the probe location is bad by ball.When carrying out weld seam detection scanning, sliding bar is when motor-driven lower edge scanning guide rail is made circular motion, the effect of locating ring owing to popped one's head in, slide up and down along with the change of distance between probe locating ring and the guide rail, and the direction of sliding bar always is parallel to the axis direction of arm, remains unchanged apart from the distance of weld seam thereby make to pop one's head in the scanning process.

The present invention has the following advantages and effect:

1. this device can carry out autoscan by butt welded seam, and the distance of the weld seam that keeps popping one's head in is constant, thereby guarantee when carrying out the transverse wave double-bevel detector weld seam detection, the commissure echo of different scanning position always is positioned at the sound path scope that reflects for the second time, thereby be convenient to the identification of echoed signal, improved the accuracy of testing result.

2. this device adopts the one dimension motor-driven to scan and finishes the bidimensional mechanical motion, drives with respect to bidimensional, has reduced the complicacy of mechanical hook-up significantly, has also reduced the complicacy of mechanical control simultaneously, has improved detection efficiency.

3. this device under the precision control of stepper motor, can be realized the accurate location to defective locations owing to adopt the probe locating ring consistent with the curve shape of weld seam, and can realize the computer reconstructing of testing result under the cooperation of imaging software.

Description of drawings

Fig. 1 is a kind of tubular joint weld Ultrasonic Detection scanister structural representation.

---scanning guide rail, 2---stepper motor, 3---sliding bar, 4---slip ring (in ball is arranged), 5---probe locating ring, 6---TKY manage arm, 7---the TKY pipe person in charge, 8---weld seam, 9---weld groove, 10---ultrasonic probes wherein: 1.

Embodiment

Below in conjunction with accompanying drawing the present invention is described in further detail:

According to Fig. 1 as can be known, this device is made up of scanning guide rail 1, stepper motor 2, sliding bar 3, slip ring 4, probe locating ring 5, it is characterized in that:

Weld groove 9 is a tangent plane of TKY arm 6, filling by scolder between the weld groove 9 and the person in charge 7 forms weld seam 8, thereby making TKY pipe arm 6 be welded on TKY securely is responsible on 7, to reinforce the steel jacket structure of forming by being responsible for, form a typical Y-piece node by TKY arm 6, the TKY person in charge 7 and weld seam 8, be the workpiece that needs detection, the position of weld seam 8 for needing on this Y-piece node to detect; Ultrasonic probe 10 is ultrasonic emitting and receiving device, is installed on the sliding bar 3, and its sound radiation face directly contacts with TKY pipe arm 6 by acoustic couplant, thereby guarantees that sound wave enters TKY arm 6; Scanning guide rail 1 is around being fixed on the TKY pipe arm 6, and scanning guide rail 1 is vertical with TKY pipe arm 6 axis directions; Stepper motor 2 (market all can be purchased) is installed on the scanning guide rail 1; Sliding bar 3 links to each other with stepper motor 2, and is moved along scanning guide rail 1 by stepper motor 2 drivings; Probe locating ring 5 is consistent with the curve shape of weld seam 8, and probe locating ring 5 is fixed on the TKY pipe arm 6, and keeps probe locating ring 5 diverse locations to be responsible for the unanimity of 7 outer wall distances to the TKY pipe along TKY pipe arm 6 generatrix directions; Slip ring 4 is fixed on the sliding bar 3, and contacts with probe locating ring 5 by ball.When carrying out weld seam 8 detection scannings, sliding bar 3 is under the driving of stepper motor 2, when making circular motion along scanning guide rail 1, the effect of locating ring 5 owing to popped one's head in, slide up and down along with the change of distance between probe locating ring 5 and the scanning guide rail 1, and the direction of sliding bar 3 always is parallel to the axis direction of TKY pipe arm 6, remains unchanged apart from the distance of weld seam thereby make to pop one's head in the scanning process.

Claims

1. tubular joint weld Ultrasonic Detection mechanical scanner, it is by scanning guide rail (1), stepper motor (2), sliding bar (3), slip ring (4), probe locating ring (5) constitutes, it is characterized in that: scanning guide rail (1) is around being fixed on the TKY pipe arm (6), scanning guide rail (1) is vertical with TKY pipe arm (6) axis direction, stepper motor (2) is installed on the scanning guide rail (1), probe locating ring (5) is fixed on the TKY pipe arm (6), sliding bar (3) links to each other with stepper motor (2), slip ring (4) is fixed on the sliding bar (3), contacts with probe locating ring (5) by ball.

2. a kind of tubular joint weld Ultrasonic Detection mechanical scanner according to claim 1 is characterized in that: probe locating ring (5) is consistent with the curve shape of weld seam (8).