CN107782753A - A kind of small diameter conduits batch ray detecting apparatus and method - Google Patents

Abstract

The invention relates to the technical field of radiation detection, and specifically discloses a batch radiation detection device and method for small-diameter catheters. 2: Carry out circumferential detection. Using the device and method of the invention for detection, compared with conventional methods, more catheters can be detected in a shorter time, the detection cycle is shortened, the detection efficiency is significantly improved, and the detection results are accurate and sensitive, which greatly improves the The reliability of radiographic detection.

Description

A small-diameter catheter batch radiation detection device and method

technical field

The invention belongs to the technical field of radiation detection, and in particular relates to a small-diameter catheter batch radiation detection device and method.

Background technique

The small-diameter catheter batch ray inspection technology for rocket engines, this inspection technology is applied to the X-ray batch inspection of gas pipe welds of various types of engines and projectiles, effectively solving the bottleneck of the batch production inspection of catheters.

The main research object is the small-diameter gas pipe of the engine and its pipe assembly. This type of conduit is formed by bending a 1Cr18Ni9Ti stainless steel tube and then welded the ball head and flange parts to the tube body by argon arc welding. The entire conduit is in different shapes of bending changes. Among them, the minimum diameter of the small diameter catheter is 6mm, and the maximum diameter is 18mm. The shortest length is only 28mm, and the longest is 2500mm. The weld seam is generally located at both ends of the conduit, which is a circular butt weld seam. The thickness of the weld seam is about 1.4mm, and the width and interval of the weld seam are about 1-2mm.

With the continuous development of scientific research technology and the development of various new types of rockets, the application of gas pipes has also increased geometrically. At present, we can only use directional X-ray photography for detection, and the difficulty of transillumination can be summarized as The following points:

(1) The number of catheters is very large, and the weld seam of each catheter needs to be inspected by X-rays. However, only 20 catheters can be inspected for each transillumination with a directional ray machine, so the cycle of batch inspection is greatly extended, so Causes a bottleneck in the detection cycle.

(2) Due to the different shapes, lengths and curvatures of gas pipes and their components, it is necessary to adjust the angle of the pipe to make the weld seam of the pipe under inspection relatively perpendicular to the direction of the radiation source during the inspection. However, due to the large bending arc of many catheters and the welding seam being too close to the root, the detection angle is not good, and multiple transilluminations are needed to make up for it.

(3) The gas pipes and components will work in the working conditions of high vibration and certain pressure, which require high quality and high detection sensitivity. If a single-directional vertical transillumination method is used, although the reliability of detection can be ensured, the detection coverage will be very low, which will greatly reduce the detection efficiency.

Therefore, it is necessary to carry out corresponding research work and adopt a reasonable transillumination method to improve the efficiency of batch detection and achieve the ideal detection effect under the premise of ensuring the reliability of detection.

Contents of the invention

The object of the present invention is to provide a batch radiation detection device and method for small-diameter catheters, which can effectively improve the efficiency of batch detection.

Technical scheme of the present invention is as follows:

A small-diameter catheter batch radiation inspection device is used for batch radiation inspection of rocket engine small-diameter catheters or small-diameter catheters for other purposes, including a transillumination frame and catheter transillumination fixing pins;

The transillumination frame includes a base, a support rod, a placement frame and connectors;

There are two bases, both of which are cuboid in shape, with a counterweight greater than 15kg, which is used to ensure the stability of the transillumination frame;

There is a support rod at the center of each base, and the height of the support rod is consistent with the transillumination height of the X-ray machine to ensure that the transillumination angle is vertical;

A plurality of through holes are provided at equal intervals longitudinally on the upper part of the support rod, and the axes of the through holes and the axis of the support rod are perpendicular to each other;

The display frame is an arc-shaped plate, and a fixed through hole is respectively provided at both ends of the display frame, the inner diameter of the fixed through hole is the same as that of the through hole, and the axis of the fixed through hole is perpendicular to the display frame;

On a section of the placement frame that is equidistant from the fixed through holes at both ends, through holes are drilled at equal intervals. The number, inner diameter and spacing of the through holes are determined according to the size of the catheter to be tested, and the axis of the through hole is parallel to the axis of the fixed through hole. ;

There are two connecting parts, which are used to connect the display frame and the two support rods;

The catheter transillumination fixing pin is a cylinder, which is divided into a core section, a middle section and a tail section;

The core section has a length of 10-15mm and a diameter of 6-18mm;

The length of the middle section and the tail section is 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 display rack, and the tail section is used to be inserted into the through hole of the display rack Transilluminate the fixed pin with the fixed catheter;

Process a 30° chamfer at the end of the core segment to avoid scratching the inner wall of the conduit.

One end of the connecting piece is connected to the fixing through hole of the display frame through a screw, and the other end is connected to the through hole on the support rod through a fixing bolt.

The radian of the display rack is rad=πD/2, D is the effective diameter within the 360° transillumination range, and the value range of D is 0.5-3m.

The material of the base is one of iron, steel and other denser materials;

The material of the support rod is steel.

On a section of the display frame that is 25mm away from the fixed through holes at both ends, drill through holes at equal intervals.

The arc length of the placement frame is 55cm, the chord length is 51cm, the thickness is 40mm, and the width is 51cm.

A detection method based on a batch radiation detection device for small-diameter catheters, comprising the following steps:

Step 1: fix the catheter to be tested;

Step 2: Carry out circumferential detection;

2.1 Select the ray source;

2.2 Select parameters and arrange image quality meter;

2.3 Carry out transillumination.

The step 1: fixing the catheter to be tested specifically includes the following steps:

1.1 Select a fixed height according to the position of the through hole on the support rod, then adjust the placement frame in place and fix it through the connector;

1.2 Select the matching catheter transillumination fixing pin according to the inner diameter of the catheter to be inspected, and insert the catheter transillumination fixing pin consistent with the number of catheters to be inspected into the through hole of the display rack;

1.3 Insert the catheters to be tested on the catheter transillumination fixing pins according to the part numbers;

1.4 Adjust the horizontal height of the X-ray machine window to be consistent with the horizontal height of the weld center of the catheter to be inspected.

Said step 2: performing circumferential detection, specifically includes the following steps:

2.1 Select the ray source, choose a circumferential X-ray source that can emit 360° rays.

2.2 Select the parameters, arrange the image quality meter, select the 90kV tube voltage, and perform two transillumination on the annular butt weld on the conduit, each transillumination angle interval is 90°;

Perform two transilluminations on the annular butt welds on the conduit, each transillumination angle is 90° apart;

For catheters of the same specification, place an image quality meter at intervals of 90°; when transilluminating catheters of different specifications at the same time, place different image quality meters;

In step 2.3, transillumination is carried out, and the double-wall and double-shadow transillumination is performed on the catheter by using the double-wall double-shadow vertical transillumination method and the double-wall double-shadow elliptical imaging transillumination method.

Every point of the arc surface of the placement frame is a tangent point with the X-ray source.

Remarkable effect of the present invention is:

(1) By adopting the device and method of the present invention for detection, compared with conventional methods, more catheters can be detected in a shorter time, the detection period is shortened, and the detection efficiency is significantly improved.

(2) The device and method of the present invention are used for detection, the detection result is accurate, the sensitivity is high, and the reliability of radiation detection is greatly improved.

(3) The device and method of the present invention are used for detection, and the image quality of the film is high, the blackness is uniform, the ellipticity of the catheter is consistent, and the detection rate is correspondingly improved.

(4) A plurality of catheters of different specifications can be placed together on the device of the present invention for simultaneous detection, which is easy to operate and easy to move.

(5) The device and method of the present invention have been used in the detection of multiple types of rocket gas conduits and components, and have a wide range of applications.

Description of drawings

Figure 1 is a top view of the transillumination frame;

Fig. 2 is the front view of transillumination frame;

Figure 3 is a schematic diagram of circumferential detection;

Fig. 4 is a schematic diagram of a catheter transillumination fixing pin.

In the figure: 1. Transillumination frame; 2. Catheter transillumination fixing pin; 3. Base; 4. Support rod; 5. Placement frame; 6. Connector.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1-4, a small-diameter catheter batch radiation detection device is used for batch radiation detection of rocket engine small-diameter catheters or small-diameter catheters for other purposes. The device includes a transillumination frame 1 and a catheter transillumination fixing pin 2. The transillumination frame 1 includes a base 3 , a support rod 4 , a placement frame 5 and a connecting piece 6 .

The base 3 has two pieces, both of which are cuboid in shape and made of iron, steel or other denser materials. The counterweight of the base 3 is relatively heavy, greater than 15kg, and is used to ensure the stability of the transillumination frame 1 .

A support rod 4 is provided at the center of each base 3, and the height of the support rod 4 is consistent with the transillumination height of the X-ray machine to ensure that the transillumination angle is vertical. The material of the support rod 4 is steel. A plurality of through holes are provided at equal intervals longitudinally on the top of the support rod 4 , and the axes of the through holes are perpendicular to the axis of the support rod 4 .

The placement frame 5 is a curved plate, the radian rad=πD/2, D is the effective diameter within the 360° transillumination range, and the value range of D is 0.5-3m. Two ends of the display frame 5 are respectively provided with a fixed through hole, the inner diameter of the fixed through hole is the same as the inner diameter of the through hole, and the axis of the fixed through hole is perpendicular to the display frame 5 . In order to make the axis of the catheter parallel to the central line of the X-ray machine for circumferential transillumination, on a section of the placement frame 5 that is 25 mm away from the fixed through holes at both ends, through holes are drilled at equal intervals. The number, inner diameter and spacing of the through holes are based on The size of the catheter to be tested is determined, and the axis of the through hole is parallel to the axis of the fixed through hole. Every point on the arc surface of the arc-shaped placement frame 5 is a tangent point with the X-ray source, effectively ensuring the perpendicularity of the detection angle.

In the actual testing process, a plurality of placement frames 5 with different through-hole parameters can be processed according to different sizes of the conduits to be tested. When testing each time, different placement frames 5 are used according to the size of the catheter to be tested.

There are two connecting parts 6 for connecting the display frame 5 and the two support rods 4 . One end of the connector 6 is connected with the fixed through hole of the placement frame 5 through a screw, and the other end is connected with the through hole on the support rod 4 through a fixed bolt.

The catheter transillumination fixing pin 2 is a cylinder and is divided into a core section, a middle section and a tail section. Among them, the length of the core section is 10-15mm, preferably 10mm, and the diameter is 6-18mm, so as to meet the needs of fixing catheters with different diameters; the length of the middle section and the tail section is 10-15mm, preferably 15mm, and the diameter of the middle section is 16 mm. -20mm, the diameter of the tail section is consistent with the inner diameter of the through hole on the placement frame 5, and the tail section is used to be inserted in the through hole of the placement frame 5 to fix the catheter transillumination fixing pin 2. Process a 30° chamfer at the end of the core segment to avoid scratching the inner wall of the conduit.

A detection method based on a rocket engine small-diameter conduit batch ray detection device, comprising the following steps:

Step 1: Secure the Catheter to Be Tested

1.1 Select a fixed height according to the position of the through hole on the support rod 4, then adjust the placement frame 5 in place, and fix it through the connecting piece 6;

1.2 Select the matching catheter transillumination fixing pin 2 according to the inner diameter of the catheter to be inspected, and insert the catheter transillumination fixing pin 2 consistent with the number of catheters to be inspected into the through hole of the placement frame 5;

1.3 Insert the catheter to be tested on the transillumination fixing pin 2 of the catheter according to the part number;

1.4 Adjust the horizontal height of the X-ray machine window to be consistent with the horizontal height of the weld center of the catheter to be inspected.

Step 2: Perform circumferential detection

2.1 Select the ray source

Select a circumferential X-ray source capable of emitting 360° rays, and use the 360° transillumination coverage of the ray source to complete the batch inspection of catheters at one time.

2.2 Select parameters and arrange image quality meter

According to the "QJ2866-1997 Catheter Radiographic Inspection Standard", the parameters are selected in combination with the actual working conditions, and the image quality meter is set. For example, select a tube voltage of 90kV, and perform two transillumination on the annular butt weld on the conduit, and each transillumination angle is separated by 90°. For catheters of the same specification, place an image quality meter at intervals of 90°; when transilluminating catheters of different specifications at the same time, place different image quality meters.

2.3 Transillumination

The double-wall double-shadow vertical transillumination method and the double-wall double-shadow elliptical imaging transillumination method are used to perform double-wall double-shadow transillumination on the catheter.

Example

Take the transillumination of 60 small-diameter conduits of a certain type of engine as an example, and the inner diameter of the conduits is φ6mm.

Step 1: Secure the Catheter to Be Tested

Choose two bases 3 whose size is 14×14×2.5cm; choose the arc length of 55cm, the chord length of 51cm, the thickness of 40mm, and the placement frame 5 of 51cm in width; the length of the core section is 10mm, the diameter 6mm, the length of the middle section and the tail section is 15mm, and the diameter of the middle section is the catheter transillumination fixing pin 2 of 16mm.

Put the catheter transillumination fixing pin 2 and the catheter on the device according to the part number, and paste the film, and stick a lead number on the film every 30 pieces according to the part number, so as to play an overlapping role.

Step 2: Perform circumferential detection

Use a circumferential X-ray machine with a ray angle of 360×22°. Move the ray source in parallel to 1 meter away from the center of the weld seam of the batch of conduits. The center beam of the ray is perpendicular to the center of the bus bar in the transilluminated area, and the transillumination is performed by the double-wall and double-shadow vertical transillumination method.

According to the thickness of the transillumination and the exposure curve to find the reasonable exposure parameters, a total of four transillumination were carried out, and each circular seam was transilluminated twice, each time at an interval of 90°. In order to reduce scattered rays and improve detection sensitivity, low-voltage transillumination was used, and the parameters of the four transillumination were: 120KV, 6mA, and 3min.

Adopting the device and method of the invention to perform batch detection of catheters has remarkable effects. Take a certain type of engine conduit as an example: 20 conduits are transilluminated by directional X-rays, and the conduits are all two annular welds, and the detection time is 2.5 hours; 100 conduits are detected by the batch detection device and method for conduits of the present invention, and the conduits are all Two circular welds, the detection time is only 1.5 hours, the detection efficiency has been significantly improved, and the sensitivity detection test in four directions can ensure the reliability of detection.

Claims (10)

1. a kind of small diameter conduits batch ray detecting apparatus, for rocket engine small diameter conduits or other purposes Small diameter conduits carry out batch ray detection, it is characterised in that：Including transillumination frame (1) and conduit transillumination steady pin (2)；

Described transillumination frame (1) includes pedestal (3), support bar (4), laying rack (5) and connector (6)；

Described pedestal (3) has two pieces, and shape is cuboid, and counterweight is more than 15kg, for ensureing the stabilization of transillumination frame (1) Property；

A support bar (4), the height of support bar (4) and the transillumination of X-ray machine X are equipped with the center of each pedestal (3) It is highly consistent, ensure transillumination angle vertical；

On the top of support bar (4) multiple through holes, the axis of through hole and the axis of support bar (4) are equidistantly opened up along longitudinal direction It is orthogonal；

Described laying rack (5) is arc, and a fixed via is respectively equipped with the both ends of laying rack (5), fixed via Internal diameter is identical with the internal diameter of through hole, and the axis of fixed via is vertical with laying rack (5)；

In laying rack (5) respectively away from both ends fixed via on equidistant one section, equidistantly get through hole, the number of through hole, internal diameter, Spacing is according to the determination of the size of conduit to be measured, the axis of through hole and the diameter parallel of fixed via；

Described connector (6) has two, for connecting laying rack (5) and two support bars (4)；

Described conduit transillumination steady pin (2) is cylinder, is divided into core section, stage casing and endpiece；

Described core segment length is 10-15mm, a diameter of 6-18mm；

Described stage casing and endpiece length is 10-15mm, a diameter of 16-20mm in stage casing, diameter and the laying rack (5) of endpiece On through hole internal diameter it is consistent, endpiece is used to be inserted in the through hole of laying rack (5) with A/C transillumination steady pin (2)；

30 ° of chamferings are processed in the end of core section, to prevent plowing from pipe inner wall.

A kind of 2. small diameter conduits batch ray detecting apparatus as claimed in claim 1, it is characterised in that：Described connector (6) one end is connected by screw with the fixed via of laying rack (5), and the other end passes through on Fixed latches and support bar (4) Through hole is connected.

A kind of 3. small diameter conduits batch ray detecting apparatus as claimed in claim 2, it is characterised in that：Described laying rack (5) radian rad=π D/2, D is effective diameter in the range of 360 ° of transilluminations, and D span is 0.5~3m.

A kind of 4. small diameter conduits batch ray detecting apparatus as claimed in claim 3, it is characterised in that：Described pedestal (3) one kind in the material that material is iron, steel and color density are larger；

The material of described support bar (4) is steel.

A kind of 5. small diameter conduits batch ray detecting apparatus as claimed in claim 4, it is characterised in that：In laying rack (5) On one section respectively away from each 25mm of both ends fixed via, hole is equidistantly got through.

A kind of 6. small diameter conduits batch ray detecting apparatus as claimed in claim 5, it is characterised in that：Described laying rack (5) arc length is 55cm, chord length 51cm, thickness 40mm, width 51cm.

A kind of 7. detection method based on small diameter conduits batch ray detecting apparatus, it is characterised in that：Comprise the following steps：

Step 1：Fixed conduit to be measured；

Step 2：Carry out circumferential detection；

2.1 selection radiographic sources；

2.2 selection parameters, arrangement image quality indicator；

2.3 carry out transillumination.

8. a kind of detection method based on small diameter conduits batch ray detecting apparatus as claimed in claim 7, its feature exist In：Described step 1：Fixed conduit to be measured, specifically includes following steps：

1.1 select a level altitude according on support bar (4) through hole site, are then adjusted in place laying rack (5), lead to It is fixed to cross connector (6)；

1.2 select the conduit transillumination steady pins (2) of matching according to the internal diameter of conduit to be checked, by with conduit quantity to be checked is consistent leads In the through hole of pipe transillumination steady pin (2) insertion laying rack (5)；

1.3 are respectively inserted in conduit to be checked on conduit transillumination steady pin (2) according to dash number；

The level height of X-ray machine X window is adjusted to consistent with the level height of conduit Weld pipe mill to be checked by 1.4.

9. a kind of detection method based on small diameter conduits batch ray detecting apparatus as claimed in claim 8, its feature exist In：Described step 2：Circumferential detection is carried out, specifically includes following steps：

2.1 selection radiographic sources, selection being capable of 360 ° of circumferential x-ray sources for sending ray；

2.2 selection parameters, arrangement image quality indicator, choose 90kV tube voltages, supravasal annular butt weld are respectively carried out saturating twice According to each 90 ° of transillumination angle interval；

To the conduit of same specification, an image quality indicator is put according at interval of 90 °；When simultaneously transillumination different size conduit When, put different image quality indicators；

Step 2.3 carries out transillumination, and using the vertical transillumination of double-walled slur and double-walled slur elliptic imaging transillumination, conduit is carried out Double-walled slur transillumination.

10. a kind of detection method based on small diameter conduits batch ray detecting apparatus as claimed in claim 9, its feature exist In：Each point of the arc surface of the laying rack (5) is in point of contact with x-ray source.