CN107782753B - Batch radiographic detection device and method for small-diameter catheters - Google Patents
Batch radiographic detection device and method for small-diameter catheters Download PDFInfo
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- CN107782753B CN107782753B CN201710851912.3A CN201710851912A CN107782753B CN 107782753 B CN107782753 B CN 107782753B CN 201710851912 A CN201710851912 A CN 201710851912A CN 107782753 B CN107782753 B CN 107782753B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/18—Investigating the presence of flaws defects or foreign matter
Abstract
The invention relates to the technical field of radiographic inspection, and particularly discloses a batch radiographic inspection device and method for small-diameter catheters, wherein the device comprises a transillumination frame and a catheter transillumination fixing pin, and the inspection method comprises the following steps: step 1: fixing a conduit to be tested; step 2: and carrying out circumferential detection. Compared with the conventional method, the device and the method can detect more catheters in shorter time, shorten the detection period, obviously improve the detection efficiency, have accurate detection result and high sensitivity, and greatly improve the reliability of ray detection.
Description
Technical Field
The invention belongs to the technical field of radiographic inspection, and particularly relates to a batch radiographic inspection device and method for small-diameter catheters.
Background
The detection technology is applied to X-ray batch detection of welding seams of gas conduits of engines and elastomers of various models, and effectively solves the bottleneck of batch production detection of the conduits.
The main research object is engine small diameter gas conduit and its conduit subassembly. The guide pipe is formed by bending a 1Cr18Ni9Ti stainless steel pipe, and welding a ball head, a flange part and a pipe body through argon arc welding, and the whole guide pipe is in different shapes with bending change. Wherein the minimum diameter of the small diameter conduit is 6mm, and the maximum diameter is 18 mm. The length is only 28mm at the shortest and 2500mm at the longest. The welding seam is generally positioned at two ends of the conduit and belongs to an annular butt welding seam, the thickness of the welding seam is about 1.4mm, and the width and the interval of the welding seam are about 1-2 mm.
With the continuous development of scientific research technology and the development and development of various new types of rockets, the application amount of gas conduits is increased in a geometric quantity manner, at present, only a directional X-ray photography method can be adopted for detection, and the difficulty of transillumination can be summarized into the following points:
(1) the number of the guide pipes is very large, the welding seam of each guide pipe needs to be subjected to X-ray detection, and only 20 guide pipes can be detected by adopting a directional ray machine for detecting transillumination every time, so that the period of batch detection is greatly prolonged, and the bottleneck of the detection period is caused.
(2) Because the shapes, lengths and curvatures of the gas conduit and the components thereof are different, the angle adjustment of the conduit is needed to ensure that the welding seam of the conduit to be detected is relatively vertical to the direction of the ray source in the detection. And because many pipes bending radian is great and the welding seam is too close to the root, cause and detect the angle not good, need many times transillumination just can compensate.
(3) The gas guide pipe and the gas guide assembly work in the working conditions of high-strength vibration and certain pressure, and have high quality requirement and high detection sensitivity requirement. If the single-orientation vertical transillumination method is used, although the reliability of detection can be ensured, the detection coverage rate is low, and the detection efficiency is greatly reduced.
Therefore, corresponding research work must be carried out, and a reasonable transillumination method is adopted, so that the efficiency of batch detection can be improved on the premise of ensuring the detection reliability, and an ideal detection effect is achieved.
Disclosure of Invention
The invention aims to provide a device and a method for detecting batch rays of small-diameter catheters, which can effectively improve the efficiency of batch detection.
The technical scheme of the invention is as follows:
a batch radiographic inspection device for small-diameter catheters is used for performing batch radiographic inspection on small-diameter catheters of rocket engines or small-diameter catheters for other purposes, and comprises a transillumination frame and a catheter transillumination fixing pin;
the transillumination frame comprises a base, a support rod, a placing frame and a connecting piece;
the two bases are cuboid, and the balance weight is larger than 15kg and is used for ensuring the stability of the transillumination frame;
a supporting rod is arranged at the center of each base, the height of each supporting rod is consistent with the transillumination height of the ray machine, and the transillumination angle is guaranteed to be vertical;
a plurality of through holes are formed in the upper part of the supporting rod at equal intervals along the longitudinal direction, and the axes of the through holes are vertical to the axis of the supporting rod;
the placing frame is an arc-shaped plate, two ends of the placing frame are respectively provided with a fixing through hole, the inner diameter of each fixing through hole is the same as that of each through hole, and the axis of each fixing through hole is vertical to the placing frame;
punching through holes at equal intervals on a section of the placing frame which is respectively equidistant from the fixed through holes at the two ends, wherein the number, the inner diameter and the interval of the through holes are determined according to the size of the conduit to be tested, and the axis of the through holes is parallel to the axis of the fixed through holes;
the two connecting pieces are used for connecting the placing frame and the two supporting rods;
the conduit transillumination fixing pin is a cylinder and is divided into a core section, a middle section and a tail section;
the length of the core segment is 10-15mm, and the diameter is 6-18 mm;
the lengths of the middle section and the tail section are both 10-15mm, the diameter of the middle section is 16-20mm, the diameter of the tail section is consistent with the inner diameter of the through hole on the placing frame, and the tail section is used for being inserted into the through hole of the placing frame to fix the catheter transillumination fixing pin;
and a 30-degree chamfer is processed at the end part of the core section so as to avoid scratching the inner wall of the conduit.
One end of the connecting piece is connected with the fixing through hole of the placing frame through a screw, and the other end of the connecting piece is connected with the through hole on the supporting rod through a fixing bolt.
The radian rad of the placing frame is pi D/2, D is the effective diameter in a 360-degree transillumination range, and the value range of D is 0.5-3 m.
The base is made of one of iron, steel and other materials with higher density;
the support rod is made of steel.
Through holes are punched at equal intervals on a section of the placing frame which is 25mm away from the fixing through holes at the two ends respectively.
The arc length of the placing frame is 55cm, the chord length is 51cm, the thickness is 40mm, and the width is 51 cm.
A detection method based on a small-diameter catheter batch radiographic detection device comprises the following steps:
step 1: fixing a conduit to be tested;
step 2: carrying out circumferential detection;
2.1 selecting a ray source;
2.2 selecting parameters and arranging image quality meters;
2.3 transillumination.
The step 1: the method for fixing the catheter to be tested specifically comprises the following steps:
1.1, selecting a fixed height according to the position of a through hole on a supporting rod, then adjusting a placing frame in place, and fixing the placing frame through a connecting piece;
1.2 selecting matched catheter transillumination fixing pins according to the inner diameter of the catheter to be detected, and inserting the catheter transillumination fixing pins with the same number as that of the catheter to be detected into through holes of a placing frame;
1.3 inserting the catheters to be detected on the catheter transillumination fixing pins respectively according to the part numbers;
1.4, adjusting the horizontal height of the window of the ray machine to be consistent with the horizontal height of the center of the welding seam of the conduit to be detected.
The step 2: performing circumferential detection, specifically comprising the following steps:
2.1 selecting a ray source, and selecting a circumferential X-ray source capable of emitting rays in 360 degrees.
2.2 selecting parameters, arranging an image quality meter, selecting 90kV pipe voltage, and carrying out transillumination on annular butt welding seams on the guide pipe twice respectively, wherein transillumination angles are spaced by 90 degrees each time;
carrying out transillumination on annular butt-joint welding seams on the guide pipe twice respectively, wherein transillumination angles are spaced by 90 degrees each time;
placing an image quality meter for catheters of the same specification at intervals of 90 degrees; when the catheters with different specifications are transilluminated at the same time, different image quality meters are placed;
and 2.3, carrying out transillumination, and carrying out double-wall double-image transillumination on the conduit by adopting a double-wall double-image vertical transillumination method and a double-wall double-image elliptical imaging transillumination method.
Each point of the arc surface of the placing frame is tangent with the X-ray source.
The invention has the following remarkable effects:
(1) compared with the conventional method, the device and the method can detect more catheters in shorter time, shorten the detection period and obviously improve the detection efficiency.
(2) The device and the method of the invention are adopted for detection, the detection result is accurate, the sensitivity is high, and the reliability of ray detection is greatly improved.
(3) The device and the method of the invention are adopted for detection, the negative film imaging quality is high, the blackness is uniform, the ovality of the catheter is consistent, and the detection rate is correspondingly improved.
(4) A plurality of catheters with different specifications can be put on the device together for detection, and the device is simple and convenient to operate and easy to move.
(5) The device and the method are already used for detecting the gas conduits and components of rockets of various models, and have wide application range.
Drawings
FIG. 1 is a top view of a transillumination stand;
FIG. 2 is a front view of a transillumination stand;
FIG. 3 is a schematic view of circumferential detection;
fig. 4 is a schematic view of a catheter transillumination fixation pin.
In the figure: 1. a transillumination frame; 2. the catheter transillumination fixing pin; 3. a base; 4. a support bar; 5. a placing frame; 6. a connecting member.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The device for the batch radiation detection of the small-diameter guide pipe as shown in figures 1-4 is used for the batch radiation detection of the small-diameter guide pipe of a rocket engine or other small-diameter guide pipes, and comprises a transillumination frame 1 and a guide pipe transillumination fixing pin 2. The transillumination frame 1 comprises a base 3, a support rod 4, a placing frame 5 and a connecting piece 6.
The two bases 3 are cuboid and made of iron, steel or other materials with high density. The base 3 is heavy in weight, more than 15kg, and is used for ensuring the stability of the transillumination frame 1.
The central position of every base 3 all is equipped with a bracing piece 4, and the height of bracing piece 4 is highly unanimous with the transillumination of ray machine, guarantees that the transillumination angle is perpendicular. The support rod 4 is made of steel. A plurality of through holes are arranged on the upper part of the support rod 4 at equal intervals along the longitudinal direction, and the axes of the through holes are vertical to the axis of the support rod 4.
The placing frame 5 is an arc-shaped plate, radian rad is pi D/2, D is an effective diameter in a 360-degree transillumination range, and the value range of D is 0.5-3 m. Two ends of the placing frame 5 are respectively provided with a fixing through hole, the inner diameter of the fixing through hole is the same as that of the through hole, and the axis of the fixing through hole is vertical to the placing frame 5. In order to make the axis of the guide tube parallel to the central line of the ray machine for circumferential transillumination, through holes are drilled at equal intervals on a section of the placing frame 5 which is 25mm away from the fixing through holes at the two ends respectively, the number, the inner diameter and the interval of the through holes are determined according to the size of the guide tube to be measured, and the axis of the through holes is parallel to the axis of the fixing through holes. Each point of the arc surface of the arc-shaped placing frame 5 is tangent with the X-ray source, so that the verticality of the detection angle is effectively ensured.
In the actual detection process, a plurality of placing frames 5 with different through hole parameters can be processed according to different sizes of the conduits to be detected. When the catheter is detected every time, different placing frames 5 are adopted according to the size conditions of different catheters to be detected.
The number of the connecting pieces 6 is two, and the connecting pieces are used for connecting the placing frame 5 and the two supporting rods 4. One end of the connecting piece 6 is connected with the fixing through hole of the placing frame 5 through a screw, and the other end is connected with the through hole on the supporting rod 4 through a fixing bolt.
The conduit transillumination fixing pin 2 is a cylinder and is divided into a core section, a middle section and a tail section. Wherein the length of the core segment is 10-15mm, preferably 10mm, and the diameter is 6-18mm, so as to meet the requirement of fixing catheters with various diameters; the lengths of the middle section and the tail section are both 10-15mm, preferably 15mm, the diameter of the middle section is 16-20mm, the diameter of the tail section is consistent with the inner diameter of a through hole in the placing frame 5, and the tail section is used for being inserted into the through hole in the placing frame 5 to fix the catheter transillumination fixing pin 2. And a 30-degree chamfer is processed at the end part of the core section so as to avoid scratching the inner wall of the conduit.
A detection method based on a rocket engine small-diameter conduit batch radiographic inspection device comprises the following steps:
step 1: fixing catheter to be tested
1.1, selecting a fixed height according to the position of a through hole on a supporting rod 4, then adjusting a placing frame 5 in place, and fixing the placing frame through a connecting piece 6;
1.2 selecting matched catheter transillumination fixing pins 2 according to the inner diameter of the catheter to be detected, and inserting the catheter transillumination fixing pins 2 with the same number as that of the catheter to be detected into through holes of a placing frame 5;
1.3, respectively inserting the catheters to be detected on the catheter transillumination fixing pins 2 according to the part numbers;
1.4, adjusting the horizontal height of the window of the ray machine to be consistent with the horizontal height of the center of the welding seam of the conduit to be detected.
Step 2: performing circumferential detection
2.1 selection radiation source
The circumferential X-ray source capable of emitting rays at 360 degrees is selected, and the batch detection of the catheters is completed at one time by utilizing the 360-degree transillumination coverage range of the X-ray source.
2.2 selecting parameters, arranging image quality meters
According to QJ2866-1997 catheter radiographic inspection standard, parameters are selected in combination with actual working conditions, and an image quality meter is set. For example, a 90kV pipe voltage is selected, and annular butt welds on the pipe are transilluminated twice each time, with transillumination angles spaced by 90 ° each time. Placing an image quality meter for catheters of the same specification at intervals of 90 degrees; when the catheters with different specifications are transilluminated at the same time, different image quality meters are placed.
2.3 performing transillumination
And performing double-wall double-image transillumination on the conduit by adopting a double-wall double-image vertical transillumination method and a double-wall double-image elliptical imaging transillumination method.
Examples
Take 60 small diameter conduits of a transillumination engine of a certain model, the inner diameter of the conduit is phi 6mm as an example.
Step 1: fixing catheter to be tested
Selecting two bases 3 with the size of 14 multiplied by 2.5 cm; selecting a placing frame 5 with the arc length of 55cm, the chord length of 51cm, the thickness of 40mm and the width of 51 cm; the length of the core section is 10mm, the diameter is 6mm, the lengths of the middle section and the tail section are both 15mm, and the diameter of the middle section is 16mm, and the catheter transillumination fixing pin 2 is selected.
The conduit transillumination fixing pin 2 and the conduit are placed on the device according to the part numbers, the films are pasted, and one type number is pasted on each 30 pieces of films according to the part numbers so as to play a role in lapping.
Step 2: performing circumferential detection
A circumferential X-ray machine is selected, and the ray angle is 360 multiplied by 22 degrees. And (3) moving the ray source to a position 1 m away from the center of the welding seam of the batch of pipes in parallel, enabling the ray central beam to be vertical to the center of a bus of the region of the transillumination at this time, and carrying out transillumination by adopting a double-wall double-shadow vertical transillumination method.
And searching reasonable exposure parameters according to the transillumination thickness and the exposure curve, and carrying out transillumination for four times totally, wherein each circular seam is transilluminated twice at an interval of 90 degrees. In order to reduce scattered rays and improve the detection sensitivity, small-voltage transillumination is adopted, and the transillumination parameters of four times are as follows: 120KV, 6mA, 3 min.
The device and the method have remarkable effect of batch detection of the catheters. Taking a certain type of engine conduit as an example: adopting directional X-ray transillumination 20 guide pipes, wherein the guide pipes are two annular welding seams, and the detection time is 2.5 hours; the device and the method for detecting the guide pipes in batches are used for detecting 100 guide pipes, the guide pipes are all two annular welding lines, the detection time is only 1.5 hours, the detection efficiency is obviously improved compared with that of the guide pipes, and the detection reliability can be ensured through the detection of the sensitivity in four directions.
Claims (10)
1. A batch radiographic inspection device for small-diameter catheters is used for performing batch radiographic inspection on small-diameter catheters of rocket engines or small-diameter catheters for other purposes, and is characterized in that: comprises a transillumination frame (1) and a catheter transillumination fixing pin (2);
the transillumination frame (1) comprises a base (3), a support rod (4), a placing frame (5) and a connecting piece (6);
the two bases (3) are cuboid, and the balance weight is more than 15kg and is used for ensuring the stability of the transillumination frame (1);
a supporting rod (4) is arranged at the center of each base (3), the height of each supporting rod (4) is consistent with the transillumination height of the ray machine, and the transillumination angle is guaranteed to be vertical;
a plurality of through holes are formed in the upper part of the support rod (4) at equal intervals along the longitudinal direction, and the axes of the through holes are vertical to the axis of the support rod (4);
the placing frame (5) is an arc-shaped plate, two ends of the placing frame (5) are respectively provided with a fixing through hole, the inner diameter of each fixing through hole is the same as that of each through hole, and the axis of each fixing through hole is perpendicular to the placing frame (5);
through holes are drilled in the placing frame (5) at equal intervals on a section which is equidistant from the fixed through holes at the two ends, the number, the inner diameter and the interval of the through holes are determined according to the size of the conduit to be tested, and the axis of the through holes is parallel to the axis of the fixed through holes;
the two connecting pieces (6) are used for connecting the placing frame (5) and the two supporting rods (4);
the catheter transillumination fixing pin (2) is a cylinder and is divided into a core section, a middle section and a tail section;
the length of the core segment is 10-15mm, and the diameter is 6-18 mm;
the lengths of the middle section and the tail section are both 10-15mm, the diameter of the middle section is 16-20mm, the diameter of the tail section is consistent with the inner diameter of a through hole on the placing frame (5), and the tail section is used for being inserted into the through hole of the placing frame (5) to fix the conduit transillumination fixing pin (2);
and a 30-degree chamfer is processed at the end part of the core section so as to avoid scratching the inner wall of the conduit.
2. A small diameter catheter batch radiographic inspection device according to claim 1, wherein: one end of the connecting piece (6) is connected with the fixing through hole of the placing frame (5) through a screw, and the other end of the connecting piece is connected with the through hole on the supporting rod (4) through a fixing bolt.
3. A small diameter catheter batch radiographic inspection device according to claim 2, wherein: the radian rad of the placing frame (5) is pi D/2, D is the effective diameter in a 360-degree transillumination range, and the value range of D is 0.5-3 m.
4. A small diameter catheter batch radiographic inspection device according to claim 3, wherein: the base (3) is made of one of iron and steel;
the support rod (4) is made of steel.
5. The apparatus for batch radiographic inspection of small diameter catheters of claim 4, wherein: through holes are punched at equal intervals on a section of the placing frame (5) which is 25mm away from the fixing through holes at the two ends respectively.
6. The apparatus for batch radiographic inspection of small diameter catheters of claim 5, wherein: the arc length of the placing frame (5) is 55cm, the chord length is 51cm, the thickness is 40mm, and the width is 51 cm.
7. A detection method based on the small-diameter catheter batch radiation detection device of claim 1, characterized by comprising the following steps: the method comprises the following steps:
step 1: fixing a conduit to be tested;
step 2: carrying out circumferential detection;
2.1 selecting a ray source;
2.2 selecting parameters and arranging image quality meters;
2.3 transillumination.
8. The detection method based on the small-diameter catheter batch radiographic detection device as claimed in claim 7, wherein: the step 1: the method for fixing the catheter to be tested specifically comprises the following steps:
1.1, selecting a fixed height according to the position of a through hole on a supporting rod (4), adjusting a placing frame (5) in place, and fixing the placing frame through a connecting piece (6);
1.2 selecting matched catheter transillumination fixing pins (2) according to the inner diameter of the catheter to be detected, and inserting the catheter transillumination fixing pins (2) with the same number as that of the catheter to be detected into through holes of a placing frame (5);
1.3, respectively inserting the catheters to be detected on the catheter transillumination fixing pins (2) according to the part numbers;
1.4, adjusting the horizontal height of the window of the ray machine to be consistent with the horizontal height of the center of the welding seam of the conduit to be detected.
9. The detection method based on the small-diameter catheter batch radiographic detection device as claimed in claim 8, wherein: the step 2: performing circumferential detection, specifically comprising the following steps:
2.1 selecting a ray source, and selecting a circumferential X-ray source capable of emitting rays in 360 degrees;
2.2 selecting parameters, arranging an image quality meter, selecting 90kV pipe voltage, and carrying out transillumination on annular butt welding seams on the guide pipe twice respectively, wherein transillumination angles are spaced by 90 degrees each time;
placing an image quality meter for catheters of the same specification at intervals of 90 degrees; when the catheters with different specifications are transilluminated at the same time, different image quality meters are placed;
and 2.3, carrying out transillumination, and carrying out double-wall double-image transillumination on the conduit by adopting a double-wall double-image vertical transillumination method and a double-wall double-image elliptical imaging transillumination method.
10. The detection method based on the small-diameter catheter batch radiographic detection device as claimed in claim 9, wherein: each point of the arc surface of the placing frame (5) is tangent with the X-ray source.
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| CN109444180B (en) * | 2018-10-24 | 2021-06-11 | 北京卫星制造厂有限公司 | X-ray detection method for NF series heat-proof material products |
| CN109358279B (en) * | 2018-11-07 | 2021-02-09 | 苏州博思得电气有限公司 | Power detection method of ray tube, power detection method of ray machine and device |
| CN109828036B (en) * | 2019-03-21 | 2024-04-05 | 江苏三合声源超声波科技有限公司 | Guide sleeve with small blind area |
| CN113125473B (en) * | 2020-01-13 | 2022-08-30 | 中国石油天然气集团有限公司 | Pipeline X-ray digital imaging detection equipment calibration method |
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| JPH10106791A (en) * | 1996-09-30 | 1998-04-24 | Japan Steel & Tube Constr Co Ltd | X-ray generator for small diameter tube inspection |
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