阅读说明：本技术 一种反应堆压力容器接管焊缝检查的胶片定位装置 (Film positioning device for detecting welding seam of connecting pipe of reactor pressure vessel ) 是由 张亮 左畅 张志义 高飞 陈小春 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种反应堆压力容器接管焊缝检查的胶片定位装置,包括胶片叉和胶片托架,所述的胶片叉与胶片暗盒形成一个整体,胶片托架与受检焊缝形成另一个整体,通过胶片叉与胶片托架的快速连接,最终实现胶片暗盒与受检焊缝之间的精确定位。本发明的有益效果在于：托架内侧贴有橡胶垫片,以保护受检部位表面和增大摩擦力。在保证足够刚性和强度的前提下,减轻了设备重量。整个托架可拆分为两个半圆部分,两头分别采用可拆铰链和快速拴紧器的形式进行连接,既保证了托架使用时的完整性,又能便于狭窄空间的运输和安装。(The invention discloses a film positioning device for checking a welding seam of a reactor pressure vessel connecting pipe, which comprises a film fork and a film bracket, wherein the film fork and a film cassette form a whole, the film bracket and a detected welding seam form another whole, and the film fork and the film bracket are quickly connected to finally realize the accurate positioning between the film cassette and the detected welding seam. The invention has the beneficial effects that: the inner side of the bracket is pasted with a rubber gasket to protect the surface of the detected part and increase the friction force. On the premise of ensuring enough rigidity and strength, the weight of the equipment is reduced. The whole bracket can be split into two semicircular parts, and two ends of the bracket are connected in a detachable hinge and quick fastener fastening mode respectively, so that the integrity of the bracket in use is guaranteed, and the bracket can be conveniently transported and installed in a narrow space.)

1. The utility model provides a film positioner of reactor pressure vessel takeover welding seam inspection which characterized in that: the film fork and the film cassette form a whole, the film bracket and the detected welding line form another whole, and the film fork and the film bracket are quickly connected to finally realize the accurate positioning between the film cassette and the detected welding line.

2. The film positioning device for the weld inspection of the connecting pipe of the reactor pressure vessel as claimed in claim 1, wherein: the film fork comprises a welding part formed by two vertical rods and a cross rod.

3. The film positioning device for the weld inspection of the connecting pipe of the reactor pressure vessel as claimed in claim 2, wherein: the two vertical rods are arranged in parallel, and the end parts of the vertical rods are semicircular.

4. The film positioning device for the weld inspection of the connecting pipe of the reactor pressure vessel as claimed in claim 2, wherein: the cross rod of the film fork is of a bilateral symmetry structure, the bottom surface of the cross rod is arc-shaped and is consistent with the curvature radius of the semicircular waistband.

5. The film positioning device for the weld inspection of the connecting pipe of the reactor pressure vessel as claimed in claim 1, wherein: the film bracket comprises a first semicircular waistband and a second semicircular waistband, the positioning block and the locking base are mounted at the designated positions of the film bracket through positioning bolts, one ends of the first semicircular waistband and the second semicircular waistband are provided with detachable hinges, and the fastening seat arranged at the other end can be used for mounting a fastening device.

6. The film positioning device for the weld inspection of the connecting pipe of the reactor pressure vessel as claimed in claim 5, wherein: one side of the first semicircular waistband and one side of the second semicircular waistband are reserved with a width area of about 25mm for positioning the arrangement of the mark and the image quality meter.

7. The film positioning device for the weld inspection of the connecting pipe of the reactor pressure vessel as claimed in claim 5, wherein: the first semicircular waistband and the second semicircular waistband are made of fan-shaped or rectangular thin-wall stainless steel plates.

8. The film positioning device for the weld inspection of the connecting pipe of the reactor pressure vessel as claimed in claim 5, wherein: the bracket is provided with a handle.

Technical Field

The invention belongs to an industrial ray inspection device for a pipeline circumferential weld, and particularly relates to a film positioning device for inspecting a connecting pipe weld.

Background

Reactor pressure vessels are important equipment used in nuclear power plants to hold and contain the reactor core and internals. The welding seam of the inlet and outlet connecting pipe of the reactor pressure vessel is positioned in the area close to the reactor core fission region, and the operation working condition is extremely complex, so that the welding seam is taken as a key inspection object in the in-service inspection specifications of domestic and foreign nuclear power stations. Prior to radiographic inspection, the inspector needs to place a film cassette on the outer surface of the weld. Firstly, confirming the position and the direction of a detected welding seam, and then marking the detection area of the detected welding seam by using lead system numbers and lead wires. Then, a plurality of image quality meters are placed near the welding seam, the film cassettes are sequentially fixed on the outer surface of the pipeline by using adhesive tapes, and finally, the back scattering lead plate is covered on the back surfaces of the film cassettes and tightened by using a locking belt.

The cassette is arranged in a narrow passage of an annular corridor in the nuclear island, the activity space of personnel is limited, and the observation is seriously influenced by the field structural support. During in-service inspection, the radiation dose of the field environment is 1-3 msv/h, the contact dose rate of the surface of the pipeline is even as high as 10-20 msv/h, and certain psychological pressure is brought to inspectors. Each piece of welding cloth usually needs 10-30 minutes, not only the operation procedure is complicated, work efficiency is lower, and inspection personnel's radiation risk is great moreover, still drops film magazine and other small articles in the hole and the gap on ground easily. The radiographic inspection time for completing the connecting pipe welding seam of the reactor pressure vessel at one time is up to 8-10 hours, and once sheet distribution errors occur, the construction period of shutdown maintenance of the nuclear power station is seriously influenced, and great economic loss is caused.

Disclosure of Invention

The invention aims to provide a film positioning device for checking a connecting pipe welding seam of a reactor pressure vessel, which can solve the problems of high difficulty, high risk, high requirement and the like of field film distribution of the connecting pipe welding seam of an inlet and an outlet of the reactor pressure vessel, and can be also used for the radiographic inspection of other types of pipeline welding seams.

The technical scheme of the invention is as follows: the utility model provides a film positioner of reactor pressure vessel takeover welding seam inspection, includes film fork and film bracket, film fork and film magazine form a whole, film bracket and examined the welding seam and form another whole, through the quick connection of film fork and film bracket, finally realize the accurate positioning between film magazine and the examined welding seam.

The film fork comprises a welding part formed by two vertical rods and a cross rod.

The two vertical rods are arranged in parallel, and the end parts of the vertical rods are semicircular.

The cross rod of the film fork is of a bilateral symmetry structure, the bottom surface of the cross rod is arc-shaped and is consistent with the curvature radius of the semicircular waistband.

The film bracket comprises a first semicircular waistband and a second semicircular waistband, the positioning block and the locking base are mounted at the designated positions of the film bracket through positioning bolts, one ends of the first semicircular waistband and the second semicircular waistband are provided with detachable hinges, and the fastening seat arranged at the other end can be used for mounting a fastening device.

One side of the first semicircular waistband and one side of the second semicircular waistband are reserved with a width area of about 25mm for positioning the arrangement of the mark and the image quality meter.

The first semicircular waistband and the second semicircular waistband are made of fan-shaped or rectangular thin-wall stainless steel plates.

The bracket is provided with a handle.

The invention has the beneficial effects that:

(1) the bracket is made of stainless steel material with the thickness of 2mm, and the inner side of the bracket is pasted with a rubber gasket to protect the surface of the detected part and increase the friction force. On the premise of ensuring enough rigidity and strength, the weight of the equipment is reduced;

(2) the whole bracket can be split into two semicircular parts, and the two ends of the bracket are respectively connected in a detachable hinge and quick fastening manner, so that the integrity of the bracket in use is ensured, and the bracket is convenient to transport and mount in a narrow space;

(3) the bracket is sequentially provided with a plurality of sets of film fork fixing devices along the circumferential direction of the pipeline, the relative position of the film fork fixing devices can be freely adjusted according to the outer diameter of a detected welding line, and each set of device is provided with a fixing block and a locking base. During installation, one end of the film fork is inserted into a gap between the fixed block pin shaft and the plane of the bracket, the other end of the film fork can be directly pressed into the groove of the locking base, and the film fork can be tightly pressed on the surface of the bracket by means of the tension of the spring in the locking base. When the film is taken, the film fork can be easily separated from the groove only by pulling the handle behind the locking base;

(4) in order to improve the applicability of the film bracket, the corresponding bracket appearance is designed according to different main pipeline appearance sizes. The binding face of the film fork and the bracket is designed into an arc shape corresponding to the appearance of the bracket, so that the binding effect is improved.

Drawings

FIG. 1 is a combination of a film cartridge and film forks;

FIG. 2 is a schematic view of a film carrier in a film positioning device for a weld inspection of a reactor pressure vessel adapter tube according to the present invention;

fig. 3 is a schematic diagram of a film fork pressing state in the film positioning device for the welding seam inspection of the reactor pressure vessel adapter tube provided by the invention.

In the figure, 1 film cartridge, 2 film fork, 3 fastening device, 4 fastening seat, 5 positioning mark, 6 locking base, 7 image quality meter, 8 fixing block, 9 first semi-circular waistband, 10 fastening seat, 11 rubber gasket, 12 second semi-circular waistband, 13 positioning screw, 14 fastening belt, 15 detachable hinge, 16 spring and 17 handle.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

The invention provides a film positioning device for detecting a welding seam of a reactor pressure vessel connecting pipe, which comprises a film fork 2 and a film bracket. As shown in fig. 1, the film fork 2 is integrated with the film cartridge 1, and the film carrier is integrated with the weld to be tested, so that the film cartridge and the weld to be tested can be accurately positioned by the quick connection between the film fork 2 and the film carrier 2.

The film fork 2 is in a shape of a Chinese character 'neither', and is a welding part formed by two vertical rods and a cross rod. The ends of the two vertical rods which are arranged in parallel are semicircular, so that the vertical rods can be smoothly inserted into the back sliding grooves of the special magazine without damaging the hidden bag. The cross rod of the film fork 2 is in a bilateral symmetry structure, the bottom surface of the cross rod is arc-shaped and is consistent with the curvature radius of the semicircular waistband. The through groove of bottom surface both alleviates the weight of film fork, can also be convenient for take of film fork. The pointed end part of the cross rod is a contact part with a positioning device on the film bracket, and the circumferential positioning of the film fork 2 is realized through the simultaneous action of a positioning pin of the fixing block 8 and a pressing block of the locking base 6; the film fork is radially positioned through the rectangular grooves of the positioning block 8 and the locking base 6.

As shown in fig. 2 and 3, the main body of the film holder includes a first semicircular waist band 9 and a second semicircular waist band 12, which are made of fan-shaped or rectangular thin-walled stainless steel plates. Before bending into a cone or a cylinder, a screw positioning hole is processed in advance, so that the installation accuracy of the positioning block 8 and the locking base 6 can be ensured. The positioning block 8 and the locking base 6 are arranged on the appointed position of the film bracket through a positioning bolt 13. One end of the first semi-circular waist belt 9 and the second semi-circular waist belt 12 is provided with a detachable hinge 15, and the other end is provided with a fastener seat 4 for installing the fastener 3. After the fastening belt 14 mounted on the pin of the fastening seat 10 is inserted into the fastening device 3, the arm of the fastening device 3 is pulled back and forth, so that the combined first and second semicircular waist belts 9 and 12 can be quickly mounted on the pipeline. According to the requirements of the number and the arrangement sequence of the film cassettes, the two first semicircular waistbands 9 and the second semicircular waistbands 12 are sequentially provided with a corresponding number of fixing blocks 8 and locking bases 6. In order to ensure that the positioning mark 5 and the image quality meter 7 can be clearly and completely displayed on the negative, a width area of about 25mm is reserved on one side of the first semicircular waistband 9 and one side of the second semicircular waistband 12 for arranging the positioning mark 5 and the image quality meter 7.

The using process of the invention is as follows:

in front of the cloth piece, the two first semicircular waistbands 9 and the second semicircular waistbands 12 are firstly combined into a whole by using the detachable hinge 15, and the positioning marks 5 and the image quality meter 7 are arranged on the edges of the first semicircular waistbands 9 and the second semicircular waistbands 12. When the device is installed on site, the bracket is wound on a detected pipeline and is fixed near a detected welding seam through the fastener 3, so that the starting point and the direction of the positioning mark 5 on the bracket are consistent with the permanent mark on the welding seam, and meanwhile, whether the distance between the edge of the bracket and the center of the welding seam is within a certain range is checked. Then, the film cartridge 1 is mounted on the fixing device of the bracket, and finally, the film cartridge 1 is tightly attached to the surface of the weld by the fixing block 8 and the locking base 6. When taking out the film, one hand holds the film cartridge, and the other hand pulls the handle 17 of the fixing device on the carriage, thereby taking out the film cartridge 1.

The invention relates to a film positioning device for detecting a welding seam of a connecting pipe of a reactor pressure vessel, which has the following characteristics:

the film cassette can be independently installed by a single person through the bracket and the film fork assembly 2;

the bracket is symmetrically provided with a plurality of sets of film fork fixing blocks 8 and a locking base 6, so that the film distribution mode that only one cassette can be installed at one time is changed into the film distribution mode that a plurality of cassettes are installed at the same time;

the fast-inserting type film fork fixing block 8 and the locking base 6 are designed to improve the mounting and dismounting efficiency of the film fork 2 and reduce the risk of the film cartridge 1 slipping;

the edge of the bracket is provided with an independent area for arranging the positioning mark 5 and the image quality meter 7;

the appearance of the bracket is designed according to the size and the shape of the detected pipeline, and the contact area between the bracket and the detected part can be effectively increased.

The film bracket adopts the hinge type connection of the conical semicircular belt, thereby not only ensuring the attaching state of the bracket and the surface of the detected pipeline, but also improving the convenience of the bracket in installation in a narrow space. The film fork positioning device designed on the film bracket can accurately divide the welding line to be detected equally by the film, thereby ensuring the full coverage of the radiographic inspection to the detected area. The rubber gasket of design in the bracket not only effectively protected the object surface of examining, can increase the frictional force between bracket and the welded seam of examining moreover, prevents that the bracket from producing and sliding.

The 'not' shape design of the film fork has a plurality of practical functions, and mainly comprises:

a) the vertical arrangement of the two cross rods and the vertical rod ensures the overall stability and realizes the circumferential and radial positioning of the concealed bag on the surface of the detected weld joint;

b) the flat vertical rods arranged in parallel can be quickly inserted into the chutes of the specially-made camera bags, so that the connection stability of the film fork and the cassette is effectively improved, and the consistency of the film fork and the symmetry center of the camera bags can be ensured;

c) the end part of the cross rod adopts the arc-shaped and bevel edge design, so that an installer can easily mount the film fork into the clamping groove of the positioning device and can not easily deviate from the clamping groove. The logical groove of horizontal pole middle part design when guaranteeing certain intensity, has increased the installer and has gripped the sense, has reduced the risk that the film fork dropped.

The fast-inserting connection design of the film fork and the positioning device effectively solves the problem of fast installation and disassembly of the cassette. During installation, one end of the film fork provided with the film cartridge is inserted into the clamping groove of the positioning block, the other end of the film fork can also easily push the wedge block of the locking base, and the spring at the rear part of the wedge block deforms under stress to exert force in the opposite direction on the wedge block, so that the function of compressing the film fork is achieved. When the rubber piece fork is disassembled, the handle at the rear part of the locking base is pulled to pull the spring to bear force, and the rubber piece fork can be smoothly taken down.