General film type radiographic inspection tool for small-diameter pipe circumferential weld parts

Abstract

The utility model discloses a universal film type radiographic inspection tool for parts such as circumferential weld joints of small-diameter pipes. The universal film type radiographic inspection tool comprises a transmission mechanism, a base, an indexing disc, an indexing circle parallel shaft and a film detection system tool, the top of the base is provided with an arc-shaped bearing groove corresponding to a part, and the transmission mechanism is used for rotating the part. The outer side of the end part of the part is sleeved with an index plate, one side of the index plate is rotatably provided with a turntable, the peripheral side of the turntable is provided with two reference circle parallel shafts parallel to the part, and the area between the two adjacent reference circle parallel shafts is an area for single exposure observation; the film detection system tool is inserted into the part in parallel, a lead sheath is arranged at the position, corresponding to a weld joint, of the film detection system tool in the part, and a rotating mechanism is arranged at one end of the film detection system tool. The radiographic inspection of 360-degree film type source outside single-wall transillumination can be realized by rotating the part and the reference circle, and the radiographic inspection device has the advantages of simple structure, convenience in assembly and disassembly and high universality.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of weld joint parts ray detection, specifically relates to a kind of small diameter pipe girth weld joint parts general film type ray detection frock. BACKGROUND

[0002] At present, small diameter pipe girth weld generally refers to the pipe weld of outer diameter ≤100mm, such small diameter pipe girth weld parts are widely applied in electric power, petrochemical industry, aviation and other industries, in aircraft manufacturing, aircraft maintenance, missile and other aircraft manufacturing, small diameter pipe girth weld parts are aviation booster, actuator, pressure accumulator and other flight control system and hydraulic system key components.Small diameter pipe girth weld parts are mainly used for oil, combustible gas, steam and reaction liquid conveying, heat exchange and cooling pipe and connecting pipe, aviation actuator, aviation hydraulic parts, and a large part of them works in harsh environment of high temperature, high pressure and corrosive medium, and the weld is the weak link in the part, once leakage or damage occurs, the loss is very huge.Film type radiography is one of the most widely used and mature methods for small diameter pipe girth weld.

[0003] Small diameter pipe girth weld is a special large penetration ratio workpiece, and radiography of girth weld is a special variable cross-section work radiography problem.Currently used radiography methods are elliptical imaging penetration method (double-wall double-image method) and source-out vertical penetration single-wall single-image method.Airline parts should preferentially use source-out vertical penetration single-wall single-image method, because the penetration thickness of source-out vertical penetration single-wall single-image method is single wall, while the penetration thickness of elliptical imaging penetration method is double wall, and the sensitivity of source-out vertical penetration single-wall single-image method is more advantageous, for example, when the wall thickness of ring weld is 8mm, the penetration wall thickness is 16mm when double-wall double-image is used, and the single-wall image quality index that needs to be found for A-level detection is #13 silk.However, the double-wall image quality index that needs to be found for A-level detection is #12 silk, and the sensitivity of single-wall penetration is higher than that of double-wall double-image.In small diameter pipe girth weld double-wall penetration, the blackness of image and geometric unsharpness change greatly due to large change in penetration thickness, and the image opening width also needs to be adjusted in double-wall double-image, and the image opening width directly affects the observable image quality;more importantly, in the case of low relative penetration thickness, the selected voltage is relatively low, resulting in larger ΔD (image contrast), so under the condition of allowing penetration, source-out vertical penetration single-wall single-image method should be preferentially selected.

[0004] When the source is outside the vertical penetration single-wall single shadow method is adopted, the ray source is placed on the center line of the weld when the penetration arrangement is made, the central ray beam is vertically directed to the center of the penetrated weld area, and the dark back of the film must be placed with a lead plate to shield the scattered rays from other parts of the inner wall of the workpiece. However, when the source is outside the vertical penetration single-wall single shadow method is applied, the following corresponding problems will be involved: the workload is large, the efficiency is low, the workers have a lot of feedback, the positioning is inaccurate, the lead and the film are off, the re-penetration is caused, the imaging is unclear, the human influence is large, the stability is extremely poor, and the work efficiency is low due to the fact that only one weld can be penetrated at a time. Practical new type content

[0005] The utility model discloses a kind of small-diameter pipe pipe ring weld class parts general film type ray detection tool, to carry out ray detection efficiently and conveniently.

[0006] The utility model mainly realizes through following technical scheme:

[0007] A kind of small-diameter pipe pipe ring weld class parts general film type ray detection tool, including transmission mechanism, base, index disc, index circle parallel shaft and film detection system tool;The top of the base is provided with arc-shaped receiving groove corresponding to the part, and the transmission mechanism is used to rotate the part;Index disc is installed on the outer side of the end of the part, one side of the index disc is rotatably provided with a turntable, two index circle parallel shafts parallel to the part are installed on the circumferential side of the turntable, and the area between adjacent two index circle parallel shafts is the area of single exposure observation;The film detection system tool is inserted into the part in parallel, and lead is arranged at the weld corresponding to the film detection system tool in the part;One end of the film detection system tool is provided with a rotating mechanism.

[0008] To better realize the utility model, further, the index disc includes annular seat body and turntable, the annular seat body is sleeved on the outer side of the part, one side of the annular seat body is rotatably provided with a turntable, and one side of the turntable is provided with a plug-in hole corresponding to the index circle parallel shaft along the circumferential side.

[0009] To better realize the utility model, further, the circumferential side of the turntable is provided with scale line.

[0010] To better realize the utility model, further, the base includes two arc-shaped seats arranged in parallel, and the adjacent arc-shaped seats are fixedly connected through fixed shafts;The top of the arc-shaped seat is provided with arc-shaped receiving groove.

[0011] For better implementation of the utility model, further, the arc-shaped receiving groove and the parts are provided with a transmission mechanism, the arc-shaped receiving groove is hinged with an arc-shaped cover plate on one side, and the arc-shaped cover plate is provided with a plurality of ball bearings on the side corresponding to the parts.

[0012] For better implementation of the utility model, further, the transmission mechanism comprises a driving motor and a plurality of driving rollers, the plurality of driving rollers are installed inside the arc-shaped groove along the arc of the arc-shaped groove, one end of the driving roller is provided with a meshing gear disc, and the meshing gear discs of the plurality of driving rollers are sequentially connected, wherein one of the meshing gear discs is connected with the driving end of the driving motor.

[0013] For better implementation of the utility model, further, the outer side of the driving roller is provided with a friction anti-skid layer.

[0014] The utility model has the advantages of simple structure, convenient installation and dismounting, and strong universality.

[0015] (1) The utility model has the advantages of simple structure, convenient installation and dismounting, and strong universality. The utility model adopts two fixed shafts to connect two arc-shaped seats distributed on the bottom plate along the length direction, so that the parts are prevented from sliding. Then, the parts are placed on the base, the index disc is placed on the parts, the area corresponding to the two parallel shafts of the index disc is used as the observed area for single exposure, the lead sheet is placed in the area to be exposed (to prevent scattered rays), and the 360-degree film type source-out single-wall transmission ray detection of the small pipe diameter parts is realized by rotating the parts, the film detection system tooling and the rotating index disc.

[0016] (2) The utility model has the advantages of accurate and reliable positioning, simple structure, convenient installation and dismounting, and strong universality. The utility model is suitable for various sizes, lengths, different film type source-out single-wall transmission ray detection, and does not need to consider tooling again. The utility model can quickly and correctly position and fix the film, reduce the labor intensity of workers and the requirement for the technical level of workers, and solve the problems of manual line marking, manual sheet insertion inaccuracy, unclear transmission, low sensitivity and the like. The utility model overcomes the problems of long workpiece detection time, large workload, low efficiency and poor stability of the existing detection. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a three-dimensional sectional view of the utility model small-diameter pipe girth weld part universal film type ray detection tooling;

[0018] Figure 2 is a detection state schematic view of the utility model;

[0019] Figure 3 This is a structural diagram of the part;

[0020] Figure 4 This is a schematic diagram showing the position and structure of the indexing disk, film, and film inspection system tooling.

[0021] Among them: 1-arc-shaped seat, 2-fixed shaft, 3-part, 4-indexing disc, 5-indexing circle parallel shaft, 6-film inspection system tooling, 7-lead sheet, 8-film, 9-weld. Detailed Implementation

[0022] Example 1:

[0023] A general-purpose film-type radiographic inspection fixture for small-diameter pipe circumferential weld seams, such as Figures 1-4 As shown, the device includes a transmission mechanism, a base, an indexing disc 4, indexing circle parallel shafts 5, and a film inspection system fixture 6. The top of the base has an arc-shaped receiving groove corresponding to part 3. The transmission mechanism is used to rotate part 3. An indexing disc 4 is fitted onto the outer side of the end of part 3. A turntable is rotatably mounted on one side of the indexing disc 4. Two indexing circle parallel shafts 5, parallel to part 3, are mounted on the circumference of the turntable. The area between two adjacent indexing circle parallel shafts 5 is the area for single-exposure observation. The film inspection system fixture 6 is inserted parallel to the interior of part 3, and lead sheet 7 is provided at the weld seam 9 corresponding to the film inspection system fixture 6 inside part 3. A rotating mechanism is provided at one end of the film inspection system fixture 6.

[0024] Preferably, the indexing disk 4 includes an annular seat and a turntable. The annular seat is sleeved on the outside of the part 3. A turntable is rotatably mounted on one side of the annular seat, and a insertion hole is provided on one side of the turntable along the circumference corresponding to the parallel axis 5 of the indexing circle.

[0025] Preferably, the base includes two parallel arc-shaped seats 1, which are fixedly connected by a fixed shaft 2; the top of the arc-shaped seat 1 is provided with an arc-shaped receiving groove.

[0026] Two fixed shafts 2 are connected together on two arc-shaped seats 1 distributed along the length direction to prevent the part 3 from sliding. Then the part 3 is placed on the arc-shaped fixed base, and the calculated indexing disk 4 is placed on the part 3. The area corresponding to the two parallel axes of the indexing circles 5 is the area to be observed in a single exposure. Then, using the film inspection system fixture 6, lead sheet 7 is placed in the area to be exposed (to prevent scattered rays), and film 8 is placed in the exposed area. By rotating the indexing disk 4 and changing the film inspection system fixture 6, the 360° film source external single-wall radiographic inspection of the small-diameter part 3 is realized.

[0027] The utility model discloses to the small diameter pipe ring weld joint class spare film formula ray detection technology cloth piece time long, the work load is big, the stability is poor, the efficiency is low etc. problem, provide a kind of structure simple, installation, dismounting is convenient, and the universality is strong, and the detection is accurate and reliable ray detection frock, and the frock is not affected by operation;Can solve the mass production of aviation parts, film formula X ray detection to small diameter pipe one or more weld 9 and carry out detection, there will be the following problems double-wall double image causes the big geometric non-clearness during transmission, the transmission thickness changes greatly, and the edge erosion effect, low sensitivity caused by transmission thickness, the work efficiency caused by small diameter single-wall single image manual rubber film 8 is low, positioning is not accurate etc.

[0028] The utility model uses the following steps:

[0029] (1) first, according to small diameter pipe weld 9 relevant ray detection GJB1187A etc. standard requirement and grade requirement, according to inner and outer circle size, wall thickness, effective transmission area, focal length etc., determine the corresponding outer circle size D and the ratio D / F of focal length F, the ratio T / D of wall thickness T and outer circle size D, obtain the transmission number N and once effective transmission length L of corresponding small diameter pipe ring weld 9 class spare 3, and correspond with the hole distance of index disc 4.The calculation method is prior art, so it is not repeated.

[0030] (2) then, small diameter pipe ring weld 9 class spare 3 is placed in effective transmission area, and small diameter pipe ring weld 9 class spare 3 is placed on arc seat 1 of equal arc, then small pipe diameter spare 3 is fixed with index disc 4, and positioning pin is installed and equal-portion line is drawn.Then again utilize film detection system frock 6 corresponding transmission length, realize the ray detection of 360 ° film formula source in outer single-wall transmission of small pipe diameter ring weld 9 spare 3 through rotating film detection system frock 6 and rotating the turntable on index disc 4.

[0031] For example, spare 3 long 500mm two welds 9, outer circle size 95mm, inner circle size 85mm, wall thickness 10mm, focal length 1200mm, there are two ring welds 9, need to carry out 100% detection to ring weld 9, adopt source in outer single-wall transmission ray detection.

[0032] According to the relevant ray detection standard GJB1187A, the effective exposure area is calculated as 600mm, the exposure area required by the part 3 needs to be placed in the effective area of 600mm, the ratio (D / F) of the outer diameter size D and the actual focal length F (1200-85) is about 0.086, the ratio T / D of the wall thickness T and the outer diameter size D is about 0.105, the exposure times obtained by checking the standard is 7 times, and the effective exposure length L of one time is calculated as about 43mm. Then, the index disc 4 with the outer diameter size of 95+0.5mm is made, the index disc 4 is drilled and divided into 7 equal parts, and the special index disc parallel shaft 5 is made on the index disc 4, so as to ensure that the part 3 does not slide in the whole detection process.

[0033] Then, the corresponding shaft is worn in the middle of the adjacent arc-shaped seat 1, so as to be fixed; the part 3 is placed on the two Φ100 arc-shaped seats 1. The film detection system tool 6 with Φ80mm is made, the lead sheet 7 (the lead sheet 7 absorbs scattered rays) is arranged at the corresponding position of the weld 9; by rotating the index disc 4 and replacing the film 8 on the film detection system tool 6, the ray detection of the 360° film type source outside single wall exposure of the girth weld 9 of the small pipe diameter part 3 is realized.

[0034] The above is only the preferred embodiment of the present application, and does not limit the present application in any form, and any simple modification and equivalent change according to the technical essence of the present application to the above embodiment all fall within the protection scope of the present application.

Claims

1. A universal film-type radiographic inspection fixture for small-diameter pipe circumferential weld seams, characterized in that, Including transmission mechanism, base, index disc (4), index circle parallel shaft (5) and film detection system tooling (6); The top of the base is provided with an arc-shaped receiving groove corresponding to the part (3), and the transmission mechanism is used for rotating the part (3); The end outer side of the part (3) is provided with an index disc (4), one side of the index disc (4) is rotatably provided with a turntable, and the turntable is provided with two index circle parallel shafts (5) parallel to the part (3), and the area between the adjacent two index circle parallel shafts (5) is the area observed by single exposure; The film detection system tooling (6) is inserted into the part (3) in parallel, and the film detection system tooling (6) in the part (3) is provided with lead (7) corresponding to the weld (9), and one end of the film detection system tooling (6) is provided with a rotating mechanism.

2. The general film type ray detection tooling for small diameter tube girth weld type parts according to claim 1, characterized in that, The index disc (4) comprises a ring type seat body and a turntable, the ring type seat body is sleeved on the outer side of the part (3), one side of the ring type seat body is rotatably provided with a turntable, and one side of the turntable is provided with a plug-in hole corresponding to the index circle parallel shaft (5) along the circumferential side.

3. The universal film type radiographic detection tooling for small diameter tube girth weld type components of claim 2, wherein, The circumferential side of the turntable is provided with a scale line.

4. The universal film type ray detection tooling for small diameter tube girth weld type components of claim 1, wherein, The base comprises two arc-shaped seats (1) arranged in parallel, and the adjacent arc-shaped seats (1) are fixedly connected through a fixed shaft (2); The top of the arc-shaped seat (1) is provided with an arc-shaped receiving groove.

5. The general purpose film type radiographic detection tooling for small diameter tube girth weld type components of claim 4, wherein, The arc-shaped receiving groove and the part (3) are provided with a transmission mechanism, one side of the arc-shaped receiving groove is hingedly provided with an arc-shaped cover plate, and the arc-shaped cover plate is rotatably provided with a plurality of ball bearings corresponding to one side of the part (3).

6. The universal film type ray detection tooling for small diameter tube girth weld type components of claim 5, wherein, The transmission mechanism comprises a driving motor and a plurality of driving rollers, and the plurality of driving rollers are installed in the arc-shaped groove in sequence along the arc of the arc-shaped groove, one end of the driving roller is provided with a meshing gear disc, and the meshing gear discs of the plurality of driving rollers are sequentially meshingly connected, and one of the meshing gear discs is connected with the driving end of the driving motor.

7. The universal film type ray detection tooling for small diameter tube girth weld type components of claim 6, wherein, The outer side of the driving roller is provided with a friction anti-skid layer.

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