CN216117393U - Movable support for circumferential X-ray flaw detection - Google Patents

Abstract

The scheme discloses a circumferential X-ray flaw detection movable support in the technical field of flaw detection, which comprises a support, a plurality of groups of plate test piece positioning fixtures and a plurality of groups of pipe test piece positioning fixtures, wherein the support comprises an annular support platform and support legs connected to the lower surface of the support platform, and the plurality of groups of plate test piece positioning fixtures and the plurality of groups of pipe test piece positioning fixtures are arranged at equal intervals along the circumferential direction of the support platform respectively; the plate test piece positioning fixture comprises a clamping groove used for clamping a plate test piece, and the pipe test piece positioning fixture comprises a clamping plate abutted to the outer wall of the pipe test piece. Compared with the mode of heightening, distance adjusting and fixing the welding test piece by adopting the box, the brick, the base plate and the like in the prior art, the welding test piece fixing device is simple and efficient to operate, strengthens the stability of the welding test piece, and ensures that the detection process is smoothly carried out.

Description

Movable support for circumferential X-ray flaw detection

Technical Field

The utility model belongs to the technical field of flaw detection, and particularly relates to a movable circumferential X-ray flaw detection support which is particularly suitable for electric welder training of steel plate butt weld test pieces and small-diameter tube butt weld test pieces for X-ray flaw detection.

Background

When a welder acquires evidence and changes evidence for training examination, in order to test the technical level of the welder, nondestructive detection needs to be carried out on a welding joint of a welding test piece, an actual operation examination is one of important contents, and the quality test of the welding test piece is carried out by ray detection according to the requirement of TSG Z6002-2010 examination rules of welding operators of special equipment, so that the welder is ensured to meet the requirement of examination and evidence acquisition. The X-ray circumferential flaw detector can be used for nondestructive testing, and welding test pieces for radiographic testing are plate butt welding test pieces (hereinafter referred to as plate test pieces) and pipe butt welding test pieces (hereinafter referred to as pipe test pieces), wherein the plate test pieces are generally 300mm multiplied by 200mm in size, the pipe test pieces are divided into two types of pipe diameters of less than 76mm and more than or equal to 76mm, the pipe diameter is more common in actual welding training and evidence obtaining examination, and the pipe test pieces of more than or equal to 76mm are fewer; the length of the pipe test piece is generally 400mm, and the welding seams are distributed in the middle of the test piece.

The examination is carried out in batches, a lot of test pieces needing radiographic inspection are needed in one practice examination, inspection results are required to be obtained in a short time, workload is high, time is urgent, and the improvement of inspection efficiency is the key for completing radiographic inspection work in due time, so that radiographic inspection also needs to be carried out in batches, and inspection efficiency is improved.

The detection efficiency of the current X-ray circumferential flaw detector is improved to a certain extent, but in operation, the X-ray circumferential flaw detector needs to be placed vertically, the welding seam joint and the ray source are ensured to be positioned on the same horizontal plane for fixing the position of a welded test piece, the X-ray circumferential flaw detector needs to be detected under the condition of the focal length which is in accordance with 550 mm-700 mm, a double-wall double-shadow elliptical imaging transillumination mode needs to be adopted for detecting the small pipe welding seam joint with the outer diameter of less than or equal to 89mm, the pipe test piece needs to be moved up and down to adjust the offset distance of the ray source, at present, no matter the pipe test piece or the plate test piece is adopted, the position fixing mode of the welded test piece adopts a box, a brick block, a base plate and the like to be lifted to adjust the offset distance, the operation is complicated and unstable, and the efficiency is extremely low.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a movable bracket for circumferential X-ray flaw detection.

The circumferential X-ray flaw detection movable support comprises a support, a plurality of groups of plate test piece positioning fixtures and a plurality of groups of pipe test piece positioning fixtures, wherein the support comprises an annular support platform and support legs connected to the lower surface of the support platform, and the plurality of groups of plate test piece positioning fixtures and the plurality of groups of pipe test piece positioning fixtures are arranged at equal intervals along the circumferential direction of the support platform respectively; the plate test piece positioning fixture comprises a clamping groove for clamping a plate test piece, and the pipe test piece positioning fixture comprises a base connected to the supporting table and two groups of clamping plates connected to the base.

The working principle of the scheme is as follows: in the scheme, the annular supporting table is arranged so that the X-ray circumferential flaw detector is placed at the center of the supporting table. When the butt-joint welding line of the plate test piece is subjected to radiographic inspection, the plate test piece is clamped in a clamping groove of a plate test piece positioning clamp, the butt-joint welding line of the plate test piece is enabled to be over against a radiation source of an X-ray circumferential flaw detector, a film is tightly attached to one side, back to the X-ray circumferential flaw detector, of the plate test piece, and then exposure and shooting are carried out.

During butt weld seam radiographic inspection of the pipe test piece, one end of the pipe test piece is clamped between the two groups of clamping plates to be fixed, the weld seam of the pipe test piece is over against a ray source of the X-ray circumferential flaw detector, and the film is placed on the area of the outer surface of the pipe test piece corresponding to the butt weld seam. Along the equidistant board test piece positioning fixture of group and the pipe test piece positioning fixture of circumference of brace table setting in this scheme, then realized carrying out ray detection to a plurality of board test pieces or pipe test piece simultaneously.

The beneficial technical effect of this scheme is: compared with the mode that the welding test piece is fixed by adopting a box, a brick block, a base plate and the like in the prior art, the method is simple and efficient to operate, strengthens the stability of the welding test piece, and ensures that the detection process is smoothly carried out.

Furthermore, the plate test piece positioning fixture further comprises four stand columns, connecting lines among the four stand columns form a quadrangle, and the four stand columns form the clamping grooves. Supporting bench is the annular in this scheme, and under the condition that four stands constitute the draw-in groove, four stands can equally divide into two sets ofly to be located two concentric circles's circumference respectively on, and then the line between them constitutes rectangle or isosceles trapezoid, and overall structure is simple, the cost is low, and four stands have four fixed points moreover, enough stability of ensureing the board test piece.

Furthermore, the clamping plates comprise two fixed plates fixedly connected to the base and two movable clamping plates connected to the base in a sliding manner, and the movable clamping plates are arc-shaped and have the same circle center; the threaded screw rod is connected to the fixed plate in a threaded mode, the front end of the threaded screw rod is aligned to the movable clamping plate, the sliding rod is fixedly connected to the movable clamping plate, and the sliding rod is connected with the fixed plate in a sliding mode. The position of fixed plate is unchangeable, can promote two movable clamp plate or reverse movement in opposite directions through the slide bar, supports when movable clamp plate and pipe test piece and holds the back, rotates the screw rod and makes it support with movable clamp plate and hold to the position of fixed movable clamp plate, the pipe test piece of convenient centre gripping of this scheme, fixed different external diameters.

Further, the pipe test piece positioning fixture further comprises a lifting adjusting rod, the base is fixedly connected to the top of the lifting adjusting rod, and the bottom of the lifting adjusting rod is fixedly connected with the supporting table.

For the pipe test piece butt-joint welding seam with the outer diameter less than or equal to 76mm, double-wall double-shadow ellipse one-time transillumination is adopted, the pipe test piece with the outer diameter less than or equal to 89mm is adopted, double-wall double-shadow ellipse two-time transillumination is adopted, and the transillumination angle is less than or equal to 90 degrees in each deflection. The film is placed on the area of the corresponding butt-joint welding line on the outer surface of the pipe test piece, the proper included angle is formed between the transillumination direction of rays and the butt-joint welding line, images of the upper welding line and the lower welding line on the film are displayed in an oval shape, and the distance between the inner sides of the minor axes of the oval is generally 3-10 mm. The pipe test piece needs to be moved up and down to complete the operation process, the backing plate is used for heightening in a conventional mode, the specifications of the backing plate are different, and the backing plate capable of being matched needs to be found, so that trouble is increased for the detection process, and the preparation time is prolonged. However, the lifting adjusting rod is adopted in the scheme, lifting adjustment can be performed according to actual needs, and the lifting adjusting rod is easy to operate and control.

Furthermore, the lifting adjusting rod is a double-head flat base push rod.

Furthermore, the supporting platform is composed of a plurality of circular ring sector plates with the same area. Compare in monoblock ring support bench, this scheme can reduce the deformation at the in-process that the preparation brace table is connected its with the supporting leg, and secondly when the thickness of welding test piece is thick, when the focus is very big, can outwards remove ring sector plate, increase focus so that detect.

Furthermore, the support platform is composed of three circular ring sector plates with equal areas.

Further, the upright posts are made of round steel, and the support table is made of a steel plate; the outer diameter of the supporting table is 1600mm, the width of the supporting table is larger than 420mm, 18 equal divisions are respectively carried out on concentric circles with the surface diameters of 1240mm and 1340mm of the supporting table, 1 upright post is welded on each equal division point, and a group of plate test piece positioning clamps are formed by four adjacent upright posts; the tube test piece positioning clamp has four groups. According to the size specification of the plate test piece and the pipe test piece mentioned in the background technology, the corresponding detection focal length is in the range of 550-700 mm, and the specification of the support table in the scheme is the relatively most appropriate scheme under the condition, so that 9 plate test pieces or 4 pipe test pieces can be detected at one time, and the number of the plate test pieces and the pipe test pieces required to be checked in the training test is matched. In the present application, the support platform is annular, and the width of the support platform refers to the difference between the outer diameter and the inner diameter of the support platform.

Drawings

FIG. 1 is a schematic structural diagram of a butt weld test piece of a movable support radiographic tube for circumferential X-ray inspection in embodiment 1 of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

fig. 3 is a schematic structural view of a pipe specimen positioning jig in a movable support for circumferential X-ray flaw detection in embodiment 1 of the present invention;

FIG. 4 is a schematic structural diagram of a butt-welded joint test piece of a transillumination plate test piece of a circumferential X-ray flaw detection movable support in embodiment 1 of the present invention;

FIG. 5 is a view showing a movable support for circumferential X-ray flaw detection in embodiment 2 of the present invention;

FIG. 6 is a schematic view of a vertical transillumination of a longitudinal weld;

fig. 7 is a schematic diagram of a double-wall dual-shadow transillumination.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: supporting table 1, circumferential X-ray flaw detector 2, upright column 3, supporting leg 4, pipe test piece 5, double-head flat base push rod 6, base 7, movable clamp plate 8, threaded screw 9, fixed clamp plate 10, slide bar 11, plate test piece 12 and circular sector 13.

Example 1 is substantially as shown in figures 1 to 4 of the accompanying drawings: circumference X-ray radiographic inspection movable support, including support, 12 positioning fixture of board test piece and four group pipe test piece positioning fixture (the picture shows and has only embodied a set ofly), the support includes annular brace table 1 and connects six supporting legs 4 at brace table 1 lower surface, brace table 1 adopts the steel sheet to make, and steel sheet thickness is 2mm, and supporting leg 4 adopts the round steel to make. The diameter of the inner circle of the supporting table 1 is 1100mm, the diameter of the outer circle of the supporting table 1 is 1660mm, six supporting legs 4 are evenly distributed on the circumference of a concentric circle of the bottom surface of the supporting table 1 with the radius of 700mm, the diameter of each supporting leg 4 is phi 60mm, and the height of each supporting leg is 285 mm. The circumference of a concentric circle on the surface of a supporting table 1 with the diameter of 1240mm and the diameter of 1340mm is respectively divided equally by 18, a stand column 3 made of round steel with the diameter of phi 14mm and the length of 50mm is welded on the dividing point, four adjacent stand columns 3 which form an isosceles trapezoid form a group of the plate test piece 12 positioning clamp through connecting lines, the four stand columns 3 form a clamping groove for placing the plate test piece 12, and the plate test piece 12 positioning clamp has nine groups.

The four groups of pipe test piece positioning clamps are arranged at equal intervals along the circumferential direction of the support table 1; the pipe test piece positioning clamp comprises a double-head flat base push rod 6, a base 7, two fixed plates and two movable clamping plates 8, wherein the fixed plates are welded on the base 7, the movable clamping plates 8 are arc-shaped, the circle centers of the two movable clamping plates 8 are the same, and the circle center is also the central point of the base 7; threaded connection holes and through holes with smooth inner walls are formed in the fixing plate, threaded screws 9 are connected to the fixing plate through the threaded connection holes, and the front ends of the threaded screws 9 are aligned to the movable clamping plates 8. The outer surface of the movable clamping plate 8 is also fixedly connected with a sliding rod 11, the sliding rod 11 penetrates through a through hole in the fixed plate in a sliding mode, when the pipe test piece 5 is placed in the center of the base 7, the sliding rod 11 is pushed towards the center of the base 7, the two arc-shaped movable clamping plates 8 are made to cling to the outer surface of the tested pipe test piece 5, then the threaded screw rod 9 is screwed down to enable the threaded screw rod to tightly abut against the movable clamping plate 8, and the tested pipe test piece 5 is fixed on the platform.

The bottom of double-end flat base push rod 6 is fixed on supporting bench 1, and base 7 fixed connection is at the top of double-end flat base push rod 6. The push rods 6 of the double-head flat-base seats on two days share one power converter (the model is S-360-12), and each push rod 6 of the double-head flat-base seat can be independently controlled.

The product parameters of the push rod 6 with the double-head flat base are as follows: the power is 20W-30W, the maximum thrust is 1000N, and the stroke is 10 mm-1200 mm.

Example 2, the difference from example 1 is: as shown in fig. 5, the support table 1 is composed of three circular ring sectors 13 of equal area.

The ray source of the circumferential X-ray flaw detector 2 is aligned with the welding seam of the welding test piece. The height of the radiation source of the circumferential X-ray flaw detector 2 is determined, and the specification of the welding test piece is also determined generally, so that when the scheme is implemented, the height of the support platform 1 can be determined according to the position of the radiation source of the circumferential X-ray flaw detector 2, and other conditions of the height of the support leg 4 are not described again here.

The size of the support table 1, the specific positions of the plate test piece 12 positioning jig and the pipe test piece positioning jig are only one embodiment, and the test focal length is only 550-700 mm.

The operation of detecting the welded test piece by the circumferential X-ray inspection machine 2 is as follows:

1. butt weld of radiographic inspection plate test piece 12

And (3) performing ray detection on the butt weld of the plate test piece 12 by adopting a vertical transillumination method, wherein the ray detection standard is NB/T47013.2-2015 according to the TSG Z6002-2010 requirement, and the detection grade is AB grade.

The butt weld of the plate test piece 12 adopts a vertical transillumination method for the longitudinal weld, because the circumferential X-ray flaw detector 2 emits rays in the circumferential direction, a plurality of films positioned in the circumferential direction can be transilluminated by one-time exposure, and the vertical transillumination method for the longitudinal weld is shown in figure 6.

In fig. 6: l1 is the distance from the source to the side surface of the specimen source, L2 is the distance from the workpiece surface to the film, L3 is the one-shot length, and the focal length F is L1+ L2.

By utilizing the butt welding seam of the movable support transillumination plate test piece 12 in the scheme of the application, the plate test piece 12 is placed between the clamping groove positions formed by the four stand columns 3, and a film is tightly attached to the back surface of the plate test piece 12 (the circumferential X-ray flaw detector 2 looks at the plate test piece 12) and then is exposed and photographed, as shown in figure 2.

2. Transillumination small-diameter pipe (external diameter is less than or equal to 89mm) pipe test piece 5 butt weld test piece

The butt welding seam of the pipe test piece 5 with the outer diameter less than or equal to 76mm adopts double-wall double-shadow ellipse one-time transillumination, the pipe test piece 5 with the outer diameter less than or equal to 89mm and more than 76mm adopts double-wall double-shadow ellipse two-time transillumination, and the transillumination angle is less than or equal to 90 degrees in each deflection. The film is placed on the area of the corresponding welding line on the outer surface of the pipe test piece 5, and the proper included angle is formed between the ray transillumination direction and the welding line as shown in figure 7, so that the images of the upper and lower welding lines on the negative film are displayed in an oval shape, and the distance between the inner sides of the minor axes of the oval is generally 3-10 mm.

In fig. 7: l1 is the distance from the source to the side surface of the source of the tube test piece 5, L2 is the distance from the surface of the workpiece to the film (L2 is D +2h), the focal length F is L1+ L2, D is the outer diameter of the tube, and h is the weld margin (typically 2 mm); s0 is the source offset distance, S0 is L1/L2(b + g), b is the width of the seam (generally, b is 10mm), and g is the opening distance of the negative elliptical seam image (3-10 mm).

Utilize the movable support of this application to look through pipe test piece 5 butt weld, pipe test piece 5 test piece butt weld width generally is 10mm, and the pipe test piece 5 length of welding seam both sides is 100mm respectively, and pipe test piece 5 test piece is placed in base 7 center department, adjusts source offset distance S0 through the height of adjusting double-end flat base push rod 6 to the inboard interval of the oval minor axis of control welding seam image satisfies the ray detection standard requirement, sees figure 4.

Claims (8)

1. The movable support for circumferential X-ray flaw detection is characterized in that: the device comprises a support, a plurality of groups of plate test piece positioning fixtures and a plurality of groups of pipe test piece positioning fixtures, wherein the support comprises an annular support platform and support legs connected to the lower surface of the support platform, and the plurality of groups of plate test piece positioning fixtures and the plurality of groups of pipe test piece positioning fixtures are arranged at equal intervals along the circumferential direction of the support platform respectively; the plate test piece positioning fixture comprises a clamping groove for clamping a plate test piece, and the pipe test piece positioning fixture comprises a base connected to the supporting table and two groups of clamping plates connected to the base.

2. The circumferential X-ray inspection mobile stand of claim 1, characterized in that: the plate test piece positioning fixture further comprises four stand columns, connecting lines among the four stand columns form a quadrangle, and the four stand columns form the clamping grooves.

3. The circumferential X-ray inspection mobile mount of claim 2, wherein: the clamping plates comprise two fixed plates fixedly connected to the base and two movable clamping plates connected to the base in a sliding mode, and the movable clamping plates are arc-shaped and have the same circle center; the threaded screw rod is connected to the fixed plate in a threaded mode, the front end of the threaded screw rod is aligned to the movable clamping plate, the sliding rod is fixedly connected to the movable clamping plate, and the sliding rod is connected with the fixed plate in a sliding mode.

4. The circumferential X-ray inspection mobile stand of claim 3, characterized in that: the pipe test piece positioning fixture further comprises a lifting adjusting rod, the base is fixedly connected to the top of the lifting adjusting rod, and the bottom of the lifting adjusting rod is fixedly connected with the supporting table.

5. The circumferential X-ray inspection mobile stand of claim 4, characterized in that: the lifting adjusting rod is a double-head flat base push rod.

6. A circumferential X-ray radiographic inspection movable stand according to any one of claims 2 to 5, characterized in that: the supporting platform is composed of a plurality of circular ring sector plates with the same area.

7. The circumferential X-ray inspection mobile mount of claim 6, wherein: the supporting platform consists of three circular ring sector plates with equal areas.

8. The circumferential X-ray inspection mobile mount of claim 7, wherein: the upright posts are made of round steel, and the support platform is made of a steel plate; the outer diameter of the supporting table is 1600mm, the width of the supporting table is larger than 420mm, 18 equal divisions are respectively carried out on concentric circles with the surface diameters of 1240mm and 1340mm of the supporting table, 1 upright post is welded on each equal division point, and a group of plate test piece positioning clamps are formed by four adjacent upright posts; the tube test piece positioning clamp has four groups.

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