CN203443933U

CN203443933U - Small-size bicrystal curved surface transverse wave ultrasonic probe

Info

Publication number: CN203443933U
Application number: CN201320512383.1U
Authority: CN
Inventors: 金彦枫; 张延丰; 张峥; 刘泉; 程旺福
Original assignee: Shanghai Lanbin Petrochemical Equipment Co Ltd; Lanzhou Petroleum Machinery Research Institute
Current assignee: Shanghai Lanbin Petrochemical Equipment Co Ltd; Lanzhou Petroleum Machinery Research Institute
Priority date: 2013-08-21
Filing date: 2013-08-21
Publication date: 2014-02-19
Anticipated expiration: 2023-08-21

Abstract

A small-size bicrystal curved surface transverse wave ultrasonic probe comprises a casing and piezoelectric crystal plates which are inclined for certain angles and oppositely arranged in the casing, wherein a soundproof layer is arranged between the piezoelectric crystal plates; sound absorption materials, sound transmission materials and cables connected with the piezoelectric crystal plates are filled in the casing below and above the piezoelectric crystal plates; flaw detection contact surfaces formed by the sound transmission materials adopt a curved surface structure; leading-out ends of the cables are parallel to the flaw detection surfaces; and the specification of the casing of the small-size ultrasonic probe is 14-22 mm long, 10-14 mm wide and 12-18 mm high. According to the small-size bicrystal curved surface transverse wave ultrasonic probe, the size of the casing is small, and the probe can be placed in a small-diameter tube for scanning detection; the curved surface structure instead of a planar structure is adopted, so that flaw detection coupling is facilitated; surface contact is adopted, so that sound energy loss is small, noise waves are few, and the flaw detection sensitivity is high; and the technical problem of ultrasonic detection of radial defects of a strength welding joint of a tube plate of the small-diameter tube can be solved.

Description

Twin crystal curved surface shear wave small size ultrasonic probe

Technical field

The utility model relates to a kind of ultrasonic probe.

Background technology

In prior art, small diameter tube (for example: external diameter 76mm, wall thickness 9mm) and tube sheet are carried out to intensity welding rear (welded structure figure is as Fig. 1), when butt welded seam carries out ultrasound examination.There is the following difficult point that detects: one, pipe external diameter is little, and pipe has certain wall thickness, and internal diameter is less, restricted the space of ultrasonic probe placement and scanning; Two, small diameter tube diameter is little, and curvature is little, after conventional plane probe placement contact seriously bad, be coupled bad, acoustical energy losses is large, clutter is many, flaw detection sensitivity is low; Three, butt welded seam detects, and in the middle of detecting, is pipe, need to penetrate pipe wall thickness and detect; Four, welded structure easily produces radially defect.

The utility model be exactly to manufacture a kind of can be to small diameter tube and the panel weld ultrasonic probe that radially defect is carried out ultrasound examination.

Utility model content

The utility model provides a kind of twin crystal curved surface shear wave small size ultrasonic probe, solves that common transversal wave ultrasonic ripple angle probe be difficult for to be placed, test surface loose contact cannot be carried out to small diameter tube the technical matters of ultrasound examination.

To achieve these goals, the utility model provides following technical scheme:

A kind of twin crystal curved surface shear wave small size ultrasonic probe, comprise the piezoelectric chip that the tilted certain angle of shell and shell is placed in opposite directions, between this piezoelectric chip, be provided with sound insulating layer, the interior filling sucting sound material of shell, the acoustic window material of piezoelectric chip upper and lower and the cable being connected with piezoelectric chip, described outer hull specification is that the flaw detection surface of contact that long 14-22mm * wide 10-14mm * high 12-18mm and described acoustic window material form is curved-surface structure.

Described cable lead-out end is parallel to test surface.

Advantage of the present utility model is as follows:

1. shell sizes is little, is conducive to probe placement inner and scanning detection in small diameter tube;

2. curved-surface structure and nonplanar structure are conducive to flaw detection coupling, and are face contacts, and acoustical energy losses is few, and clutter is few, and flaw detection sensitivity is high;

3. parallel the drawing of cable and non-perpendicular drawing is the requirement of considering probe flaw detection space equally, is more conducive to flaw detection.

4. double crystal probe, flaw detection sensitivity is high.Because pipe has certain wall thickness, acoustic energy is lossy, therefore adopt one one two wafers receiving, and clutter is few, easily carrying out flaw detection scope is adjusted to detected weld seam.

5. shear wave detects, and is conducive to find radially defect.

Accompanying drawing explanation

Fig. 1 is the welded structure schematic diagram of small diameter tube and tube sheet;

Fig. 2 is common ultrasound wave double crystal probe structural representation;

Fig. 3 is main TV structure schematic diagram of the present utility model;

Fig. 4 is the side structure schematic diagram of Fig. 3;

Fig. 5 is the A-A in Fig. 3 ^'to cut-open view.

Embodiment

The utility model adopts twin crystal, curved surface, shear wave, small size ultrasonic probe.What Fig. 2 reflected is common ultrasound wave double crystal probe, comprises shell 3, piezoelectric chip 4, piezoelectric chip 8, acoustic window material 2, cable 5, cable 9, sound insulating layer 6 and acoustic absorbant 7 etc.; This type of probe flaw detection surface of contact is plane, and cable is generally vertically and draws, and probe size is larger.

As shown in Figure 3, a kind of twin crystal curved surface shear wave small size ultrasonic probe, comprise first, second piezoelectric chip 1,8 that the tilted certain angle of shell 3 and shell is placed in opposite directions and on damping material, between this first, second piezoelectric chip 1,8, be provided with sound insulating layer 5, the interior filling sucting sound material 6 of shell 3 of these first, second piezoelectric chip 1,8 upper and lowers, acoustic window material 2 and first, second cable 4,7 being connected with first, second piezoelectric chip 1,8, the flaw detection surface of contact that described acoustic window material 2 forms is curved-surface structure, and curvature is with detected material.Conventional plane probe shown in Fig. 2 contacts with the tube-tube plate welding structure shown in Fig. 1, obviously loose contact, and this concave surface contact coupling effect is the poorest, and acoustical energy losses is maximum.And adopt curved-surface structure contact of the present utility model, and flaw detection surface of contact is exactly planar structure, and coupling effect is good, and acoustical energy losses is little, and flaw detection sensitivity is high; Adopting double crystal probe is to consider to go flaw detection through pipe wall thickness, and one one receipts structure is more favourable.

Described first, second cable 4,7 exits are parallel to test surface, are more conducive to the flaw detection space of control tube inside, are convenient to scanning and detection.

In order to make to enter the sound wave of workpiece, it is shear wave, described first, second piezoelectric chip 1,8 tilted-putted angles form by adjusting two-dimentional inclined-plane slope, the gradient on general this inclined-plane is advisable to produce shear wave between 45～75, concrete structure is shown in Fig. 3, Fig. 5, thisly by controlling first, second piezoelectric chip 1,8 angles, make to incide and in workpiece, produce shear wave, the incident of shear wave inclination certain angle is detected workpiece, is conducive to find the radially defect of weld seam.

The outer hull specification of small size ultrasonic probe is long 14-22mm * wide 10-14mm * high 12-18mm, and probe size is little, and same wafer is also little, is more conducive to improve the location of defect, quantitative accuracy.

When making this probe, note following some:

1. acoustic window material, owing to being curved-surface structure, adopt more wear-resisting material;

2. because tube wall will pass in flaw detection district, so need to adjust the wafer angle district that makes to detect a flaw and be positioned at weld seam and heat-affected zone, certainly also need not consider the problem of surperficial blind area;

3. must control probe apparent size, make it conveniently be positioned over tube interior scanning.

4. owing to being that shear wave detects, adjust wafer angle, not only will make acoustic beam intersect at detection zone, also will make acoustic beam oblique incidence, in detected workpiece, produce shear wave.

Claims

1. a twin crystal curved surface shear wave small size ultrasonic probe, comprise the piezoelectric chip that the tilted certain angle of shell and shell is placed in opposite directions, between this piezoelectric chip, be provided with sound insulating layer, the interior filling sucting sound material of shell, the acoustic window material of piezoelectric chip upper and lower and the cable being connected with piezoelectric chip, is characterized in that: described outer hull specification is that the flaw detection surface of contact that long 14-22mm * wide 10-14mm * high 12-18mm and described acoustic window material form is curved-surface structure.

2. a kind of twin crystal curved surface shear wave small size ultrasonic probe according to claim 1, is characterized in that: described cable lead-out end is parallel to test surface.